drivers/media/video/sn9c102/sn9c102_core.c

   1 /***************************************************************************
   2  * V4L2 driver for SN9C1xx PC Camera Controllers                           *
   3  *                                                                         *
   4  * Copyright (C) 2004-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
   5  *                                                                         *
   6  * This program is free software; you can redistribute it and/or modify    *
   7  * it under the terms of the GNU General Public License as published by    *
   8  * the Free Software Foundation; either version 2 of the License, or       *
   9  * (at your option) any later version.                                     *
  10  *                                                                         *
  11  * This program is distributed in the hope that it will be useful,         *
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  14  * GNU General Public License for more details.                            *
  15  *                                                                         *
  16  * You should have received a copy of the GNU General Public License       *
  17  * along with this program; if not, write to the Free Software             *
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  19  ***************************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/param.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/device.h>
  28 #include <linux/fs.h>
  29 #include <linux/delay.h>
  30 #include <linux/compiler.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/poll.h>
  33 #include <linux/stat.h>
  34 #include <linux/mm.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/page-flags.h>
  37 #include <asm/byteorder.h>
  38 #include <asm/page.h>
  39 #include <asm/uaccess.h>
  40
  41 #include "sn9c102.h"
  42
  43 /*****************************************************************************/
  44
  45 #define SN9C102_MODULE_NAME     "V4L2 driver for SN9C1xx PC Camera Controllers"
  46 #define SN9C102_MODULE_ALIAS    "sn9c1xx"
  47 #define SN9C102_MODULE_AUTHOR   "(C) 2004-2007 Luca Risolia"
  48 #define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
  49 #define SN9C102_MODULE_LICENSE  "GPL"
  50 #define SN9C102_MODULE_VERSION  "1:1.47pre49"
  51 #define SN9C102_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 47)
  52
  53 /*****************************************************************************/
  54
  55 MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
  56
  57 MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
  58 MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
  59 MODULE_ALIAS(SN9C102_MODULE_ALIAS);
  60 MODULE_VERSION(SN9C102_MODULE_VERSION);
  61 MODULE_LICENSE(SN9C102_MODULE_LICENSE);
  62
  63 static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
  64 module_param_array(video_nr, short, NULL, 0444);
  65 MODULE_PARM_DESC(video_nr,
  66                  " <-1|n[,...]>"
  67                  "\nSpecify V4L2 minor mode number."
  68                  "\n-1 = use next available (default)"
  69                  "\n n = use minor number n (integer >= 0)"
  70                  "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
  71                  " cameras this way."
  72                  "\nFor example:"
  73                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  74                  "\nthe second camera and use auto for the first"
  75                  "\none and for every other camera."
  76                  "\n");
  77
  78 static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  79                                SN9C102_FORCE_MUNMAP};
  80 module_param_array(force_munmap, bool, NULL, 0444);
  81 MODULE_PARM_DESC(force_munmap,
  82                  " <0|1[,...]>"
  83                  "\nForce the application to unmap previously"
  84                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  85                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  86                  "\nthis feature. This parameter is specific for each"
  87                  "\ndetected camera."
  88                  "\n0 = do not force memory unmapping"
  89                  "\n1 = force memory unmapping (save memory)"
  90                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
  91                  "\n");
  92
  93 static unsigned int frame_timeout[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  94                                        SN9C102_FRAME_TIMEOUT};
  95 module_param_array(frame_timeout, uint, NULL, 0644);
  96 MODULE_PARM_DESC(frame_timeout,
  97                  " <0|n[,...]>"
  98                  "\nTimeout for a video frame in seconds before"
  99                  "\nreturning an I/O error; 0 for infinity."
 100                  "\nThis parameter is specific for each detected camera."
 101                  "\nDefault value is "__MODULE_STRING(SN9C102_FRAME_TIMEOUT)"."
 102                  "\n");
 103
 104 #ifdef SN9C102_DEBUG
 105 static unsigned short debug = SN9C102_DEBUG_LEVEL;
 106 module_param(debug, ushort, 0644);
 107 MODULE_PARM_DESC(debug,
 108                  " <n>"
 109                  "\nDebugging information level, from 0 to 3:"
 110                  "\n0 = none (use carefully)"
 111                  "\n1 = critical errors"
 112                  "\n2 = significant informations"
 113                  "\n3 = more verbose messages"
 114                  "\nLevel 3 is useful for testing only."
 115                  "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
 116                  "\n");
 117 #endif
 118
 119 /*
 120    Add the probe entries to this table. Be sure to add the entry in the right
 121    place, since, on failure, the next probing routine is called according to
 122    the order of the list below, from top to bottom.
 123 */
 124 static int (*sn9c102_sensor_table[])(struct sn9c102_device *) = {
 125         &sn9c102_probe_hv7131d, /* strong detection based on SENSOR ids */
 126         &sn9c102_probe_hv7131r, /* strong detection based on SENSOR ids */
 127         &sn9c102_probe_mi0343, /* strong detection based on SENSOR ids */
 128         &sn9c102_probe_mi0360, /* strong detection based on SENSOR ids */
 129         &sn9c102_probe_mt9v111, /* strong detection based on SENSOR ids */
 130         &sn9c102_probe_pas106b, /* strong detection based on SENSOR ids */
 131         &sn9c102_probe_pas202bcb, /* strong detection based on SENSOR ids */
 132         &sn9c102_probe_ov7630, /* strong detection based on SENSOR ids */
 133         &sn9c102_probe_ov7660, /* strong detection based on SENSOR ids */
 134         &sn9c102_probe_tas5110c1b, /* detection based on USB pid/vid */
 135         &sn9c102_probe_tas5110d, /* detection based on USB pid/vid */
 136         &sn9c102_probe_tas5130d1b, /* detection based on USB pid/vid */
 137 };
 138
 139 /*****************************************************************************/
 140
 141 static u32
 142 sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
 143                         enum sn9c102_io_method io)
 144 {
 145         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 146         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 147         size_t imagesize = cam->module_param.force_munmap || io == IO_READ ?
 148                            (p->width * p->height * p->priv) / 8 :
 149                            (r->width * r->height * p->priv) / 8;
 150         void* buff = NULL;
 151         u32 i;
 152
 153         if (count > SN9C102_MAX_FRAMES)
 154                 count = SN9C102_MAX_FRAMES;
 155
 156         if (cam->bridge == BRIDGE_SN9C105 || cam->bridge == BRIDGE_SN9C120)
 157                 imagesize += 589 + 2; /* length of JPEG header + EOI marker */
 158
 159         cam->nbuffers = count;
 160         while (cam->nbuffers > 0) {
 161                 if ((buff = vmalloc_32_user(cam->nbuffers *
 162                                             PAGE_ALIGN(imagesize))))
 163                         break;
 164                 cam->nbuffers--;
 165         }
 166
 167         for (i = 0; i < cam->nbuffers; i++) {
 168                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 169                 cam->frame[i].buf.index = i;
 170                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 171                 cam->frame[i].buf.length = imagesize;
 172                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 173                 cam->frame[i].buf.sequence = 0;
 174                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 175                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 176                 cam->frame[i].buf.flags = 0;
 177         }
 178
 179         return cam->nbuffers;
 180 }
 181
 182
 183 static void sn9c102_release_buffers(struct sn9c102_device* cam)
 184 {
 185         if (cam->nbuffers) {
 186                 vfree(cam->frame[0].bufmem);
 187                 cam->nbuffers = 0;
 188         }
 189         cam->frame_current = NULL;
 190 }
 191
 192
 193 static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
 194 {
 195         u32 i;
 196
 197         INIT_LIST_HEAD(&cam->inqueue);
 198         INIT_LIST_HEAD(&cam->outqueue);
 199
 200         for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
 201                 cam->frame[i].state = F_UNUSED;
 202                 cam->frame[i].buf.bytesused = 0;
 203         }
 204 }
 205
 206
 207 static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
 208 {
 209         struct sn9c102_frame_t *i;
 210
 211         list_for_each_entry(i, &cam->outqueue, frame) {
 212                 i->state = F_QUEUED;
 213                 list_add(&i->frame, &cam->inqueue);
 214         }
 215
 216         INIT_LIST_HEAD(&cam->outqueue);
 217 }
 218
 219
 220 static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
 221 {
 222         unsigned long lock_flags;
 223         u32 i;
 224
 225         for (i = 0; i < cam->nbuffers; i++)
 226                 if (cam->frame[i].state == F_UNUSED) {
 227                         cam->frame[i].state = F_QUEUED;
 228                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 229                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 230                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 231                 }
 232 }
 233
 234 /*****************************************************************************/
 235
 236 /*
 237    Write a sequence of count value/register pairs. Returns -1 after the first
 238    failed write, or 0 for no errors.
 239 */
 240 int sn9c102_write_regs(struct sn9c102_device* cam, const u8 valreg[][2],
 241                        int count)
 242 {
 243         struct usb_device* udev = cam->usbdev;
 244         u8* buff = cam->control_buffer;
 245         int i, res;
 246
 247         for (i = 0; i < count; i++) {
 248                 u8 index = valreg[i][1];
 249
 250                 /*
 251                    index is a u8, so it must be <256 and can't be out of range.
 252                    If we put in a check anyway, gcc annoys us with a warning
 253                    hat our check is useless. People get all uppity when they
 254                    see warnings in the kernel compile.
 255                 */
 256
 257                 *buff = valreg[i][0];
 258
 259                 res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08,
 260                                       0x41, index, 0, buff, 1,
 261                                       SN9C102_CTRL_TIMEOUT);
 262
 263                 if (res < 0) {
 264                         DBG(3, "Failed to write a register (value 0x%02X, "
 265                                "index 0x%02X, error %d)", *buff, index, res);
 266                         return -1;
 267                 }
 268
 269                 cam->reg[index] = *buff;
 270         }
 271
 272         return 0;
 273 }
 274
 275
 276 int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
 277 {
 278         struct usb_device* udev = cam->usbdev;
 279         u8* buff = cam->control_buffer;
 280         int res;
 281
 282         if (index >= ARRAY_SIZE(cam->reg))
 283                 return -1;
 284
 285         *buff = value;
 286
 287         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 288                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 289         if (res < 0) {
 290                 DBG(3, "Failed to write a register (value 0x%02X, index "
 291                        "0x%02X, error %d)", value, index, res);
 292                 return -1;
 293         }
 294
 295         cam->reg[index] = value;
 296
 297         return 0;
 298 }
 299
 300
 301 /* NOTE: with the SN9C10[123] reading some registers always returns 0 */
 302 int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
 303 {
 304         struct usb_device* udev = cam->usbdev;
 305         u8* buff = cam->control_buffer;
 306         int res;
 307
 308         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 309                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 310         if (res < 0)
 311                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 312                     index, res);
 313
 314         return (res >= 0) ? (int)(*buff) : -1;
 315 }
 316
 317
 318 int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
 319 {
 320         if (index >= ARRAY_SIZE(cam->reg))
 321                 return -1;
 322
 323         return cam->reg[index];
 324 }
 325
 326
 327 static int
 328 sn9c102_i2c_wait(struct sn9c102_device* cam,
 329                  const struct sn9c102_sensor* sensor)
 330 {
 331         int i, r;
 332
 333         for (i = 1; i <= 5; i++) {
 334                 r = sn9c102_read_reg(cam, 0x08);
 335                 if (r < 0)
 336                         return -EIO;
 337                 if (r & 0x04)
 338                         return 0;
 339                 if (sensor->frequency & SN9C102_I2C_400KHZ)
 340                         udelay(5*16);
 341                 else
 342                         udelay(16*16);
 343         }
 344         return -EBUSY;
 345 }
 346
 347
 348 static int
 349 sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
 350                               const struct sn9c102_sensor* sensor)
 351 {
 352         int r , err = 0;
 353
 354         r = sn9c102_read_reg(cam, 0x08);
 355         if (r < 0)
 356                 err += r;
 357
 358         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
 359                 if (!(r & 0x08))
 360                         err += -1;
 361         } else {
 362                 if (r & 0x08)
 363                         err += -1;
 364         }
 365
 366         return err ? -EIO : 0;
 367 }
 368
 369
 370 static int
 371 sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
 372                                const struct sn9c102_sensor* sensor)
 373 {
 374         int r;
 375         r = sn9c102_read_reg(cam, 0x08);
 376         return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
 377 }
 378
 379
 380 int
 381 sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
 382                          const struct sn9c102_sensor* sensor, u8 data0,
 383                          u8 data1, u8 n, u8 buffer[])
 384 {
 385         struct usb_device* udev = cam->usbdev;
 386         u8* data = cam->control_buffer;
 387         int i = 0, err = 0, res;
 388
 389         /* Write cycle */
 390         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 391                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
 392         data[1] = data0; /* I2C slave id */
 393         data[2] = data1; /* address */
 394         data[7] = 0x10;
 395         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 396                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 397         if (res < 0)
 398                 err += res;
 399
 400         err += sn9c102_i2c_wait(cam, sensor);
 401
 402         /* Read cycle - n bytes */
 403         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 404                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
 405                   (n << 4) | 0x02;
 406         data[1] = data0;
 407         data[7] = 0x10;
 408         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 409                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 410         if (res < 0)
 411                 err += res;
 412
 413         err += sn9c102_i2c_wait(cam, sensor);
 414
 415         /* The first read byte will be placed in data[4] */
 416         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 417                               0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
 418         if (res < 0)
 419                 err += res;
 420
 421         err += sn9c102_i2c_detect_read_error(cam, sensor);
 422
 423         PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
 424               data[4]);
 425
 426         if (err) {
 427                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 428                 return -1;
 429         }
 430
 431         if (buffer)
 432                 for (i = 0; i < n && i < 5; i++)
 433                         buffer[n-i-1] = data[4-i];
 434
 435         return (int)data[4];
 436 }
 437
 438
 439 int
 440 sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
 441                           const struct sn9c102_sensor* sensor, u8 n, u8 data0,
 442                           u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
 443 {
 444         struct usb_device* udev = cam->usbdev;
 445         u8* data = cam->control_buffer;
 446         int err = 0, res;
 447
 448         /* Write cycle. It usually is address + value */
 449         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 450                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
 451                   | ((n - 1) << 4);
 452         data[1] = data0;
 453         data[2] = data1;
 454         data[3] = data2;
 455         data[4] = data3;
 456         data[5] = data4;
 457         data[6] = data5;
 458         data[7] = 0x17;
 459         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 460                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 461         if (res < 0)
 462                 err += res;
 463
 464         err += sn9c102_i2c_wait(cam, sensor);
 465         err += sn9c102_i2c_detect_write_error(cam, sensor);
 466
 467         if (err)
 468                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 469
 470         PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
 471               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
 472               n, data0, data1, data2, data3, data4, data5);
 473
 474         return err ? -1 : 0;
 475 }
 476
 477
 478 int
 479 sn9c102_i2c_try_read(struct sn9c102_device* cam,
 480                      const struct sn9c102_sensor* sensor, u8 address)
 481 {
 482         return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
 483                                         address, 1, NULL);
 484 }
 485
 486
 487 static int sn9c102_i2c_try_write(struct sn9c102_device* cam,
 488                                  const struct sn9c102_sensor* sensor,
 489                                  u8 address, u8 value)
 490 {
 491         return sn9c102_i2c_try_raw_write(cam, sensor, 3,
 492                                          sensor->i2c_slave_id, address,
 493                                          value, 0, 0, 0);
 494 }
 495
 496
 497 int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
 498 {
 499         return sn9c102_i2c_try_read(cam, &cam->sensor, address);
 500 }
 501
 502
 503 int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
 504 {
 505         return sn9c102_i2c_try_write(cam, &cam->sensor, address, value);
 506 }
 507
 508 /*****************************************************************************/
 509
 510 static size_t sn9c102_sof_length(struct sn9c102_device* cam)
 511 {
 512         switch (cam->bridge) {
 513         case BRIDGE_SN9C101:
 514         case BRIDGE_SN9C102:
 515                 return 12;
 516         case BRIDGE_SN9C103:
 517                 return 18;
 518         case BRIDGE_SN9C105:
 519         case BRIDGE_SN9C120:
 520                 return 62;
 521         }
 522
 523         return 0;
 524 }
 525
 526
 527 static void*
 528 sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
 529 {
 530         static const char marker[6] = {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96};
 531         const char *m = mem;
 532         size_t soflen = 0, i, j;
 533
 534         soflen = sn9c102_sof_length(cam);
 535
 536         for (i = 0; i < len; i++) {
 537                 size_t b;
 538
 539                 /* Read the variable part of the header */
 540                 if (unlikely(cam->sof.bytesread >= sizeof(marker))) {
 541                         cam->sof.header[cam->sof.bytesread] = *(m+i);
 542                         if (++cam->sof.bytesread == soflen) {
 543                                 cam->sof.bytesread = 0;
 544                                 return mem + i;
 545                         }
 546                         continue;
 547                 }
 548
 549                 /* Search for the SOF marker (fixed part) in the header */
 550                 for (j = 0, b=cam->sof.bytesread; j+b < sizeof(marker); j++) {
 551                         if (unlikely(i+j == len))
 552                                 return NULL;
 553                         if (*(m+i+j) == marker[cam->sof.bytesread]) {
 554                                 cam->sof.header[cam->sof.bytesread] = *(m+i+j);
 555                                 if (++cam->sof.bytesread == sizeof(marker)) {
 556                                         PDBGG("Bytes to analyze: %zd. SOF "
 557                                               "starts at byte #%zd", len, i);
 558                                         i += j+1;
 559                                         break;
 560                                 }
 561                         } else {
 562                                 cam->sof.bytesread = 0;
 563                                 break;
 564                         }
 565                 }
 566         }
 567
 568         return NULL;
 569 }
 570
 571
 572 static void*
 573 sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
 574 {
 575         static const u8 eof_header[4][4] = {
 576                 {0x00, 0x00, 0x00, 0x00},
 577                 {0x40, 0x00, 0x00, 0x00},
 578                 {0x80, 0x00, 0x00, 0x00},
 579                 {0xc0, 0x00, 0x00, 0x00},
 580         };
 581         size_t i, j;
 582
 583         /* The EOF header does not exist in compressed data */
 584         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X ||
 585             cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
 586                 return NULL;
 587
 588         /*
 589            The EOF header might cross the packet boundary, but this is not a
 590            problem, since the end of a frame is determined by checking its size
 591            in the first place.
 592         */
 593         for (i = 0; (len >= 4) && (i <= len - 4); i++)
 594                 for (j = 0; j < ARRAY_SIZE(eof_header); j++)
 595                         if (!memcmp(mem + i, eof_header[j], 4))
 596                                 return mem + i;
 597
 598         return NULL;
 599 }
 600
 601
 602 static void
 603 sn9c102_write_jpegheader(struct sn9c102_device* cam, struct sn9c102_frame_t* f)
 604 {
 605         static const u8 jpeg_header[589] = {
 606                 0xff, 0xd8, 0xff, 0xdb, 0x00, 0x84, 0x00, 0x06, 0x04, 0x05,
 607                 0x06, 0x05, 0x04, 0x06, 0x06, 0x05, 0x06, 0x07, 0x07, 0x06,
 608                 0x08, 0x0a, 0x10, 0x0a, 0x0a, 0x09, 0x09, 0x0a, 0x14, 0x0e,
 609                 0x0f, 0x0c, 0x10, 0x17, 0x14, 0x18, 0x18, 0x17, 0x14, 0x16,
 610                 0x16, 0x1a, 0x1d, 0x25, 0x1f, 0x1a, 0x1b, 0x23, 0x1c, 0x16,
 611                 0x16, 0x20, 0x2c, 0x20, 0x23, 0x26, 0x27, 0x29, 0x2a, 0x29,
 612                 0x19, 0x1f, 0x2d, 0x30, 0x2d, 0x28, 0x30, 0x25, 0x28, 0x29,
 613                 0x28, 0x01, 0x07, 0x07, 0x07, 0x0a, 0x08, 0x0a, 0x13, 0x0a,
 614                 0x0a, 0x13, 0x28, 0x1a, 0x16, 0x1a, 0x28, 0x28, 0x28, 0x28,
 615                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 616                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 617                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 618                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 619                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0xff, 0xc4, 0x01, 0xa2,
 620                 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 621                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
 622                 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01,
 623                 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 624                 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
 625                 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x10, 0x00,
 626                 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04,
 627                 0x04, 0x00, 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04,
 628                 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61,
 629                 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23,
 630                 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62,
 631                 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
 632                 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38,
 633                 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
 634                 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64,
 635                 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 636                 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
 637                 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
 638                 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
 639                 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2,
 640                 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3,
 641                 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3,
 642                 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3,
 643                 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02,
 644                 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04,
 645                 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
 646                 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
 647                 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1,
 648                 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1,
 649                 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19,
 650                 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
 651                 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
 652                 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64,
 653                 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 654                 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 655                 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
 656                 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9,
 657                 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
 658                 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
 659                 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3,
 660                 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4,
 661                 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xc0, 0x00, 0x11,
 662                 0x08, 0x01, 0xe0, 0x02, 0x80, 0x03, 0x01, 0x21, 0x00, 0x02,
 663                 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xda, 0x00, 0x0c, 0x03,
 664                 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
 665         };
 666         u8 *pos = f->bufmem;
 667
 668         memcpy(pos, jpeg_header, sizeof(jpeg_header));
 669         *(pos + 6) = 0x00;
 670         *(pos + 7 + 64) = 0x01;
 671         if (cam->compression.quality == 0) {
 672                 memcpy(pos + 7, SN9C102_Y_QTABLE0, 64);
 673                 memcpy(pos + 8 + 64, SN9C102_UV_QTABLE0, 64);
 674         } else if (cam->compression.quality == 1) {
 675                 memcpy(pos + 7, SN9C102_Y_QTABLE1, 64);
 676                 memcpy(pos + 8 + 64, SN9C102_UV_QTABLE1, 64);
 677         }
 678         *(pos + 564) = cam->sensor.pix_format.width & 0xFF;
 679         *(pos + 563) = (cam->sensor.pix_format.width >> 8) & 0xFF;
 680         *(pos + 562) = cam->sensor.pix_format.height & 0xFF;
 681         *(pos + 561) = (cam->sensor.pix_format.height >> 8) & 0xFF;
 682         *(pos + 567) = 0x21;
 683
 684         f->buf.bytesused += sizeof(jpeg_header);
 685 }
 686
 687
 688 static void sn9c102_urb_complete(struct urb *urb)
 689 {
 690         struct sn9c102_device* cam = urb->context;
 691         struct sn9c102_frame_t** f;
 692         size_t imagesize, soflen;
 693         u8 i;
 694         int err = 0;
 695
 696         if (urb->status == -ENOENT)
 697                 return;
 698
 699         f = &cam->frame_current;
 700
 701         if (cam->stream == STREAM_INTERRUPT) {
 702                 cam->stream = STREAM_OFF;
 703                 if ((*f))
 704                         (*f)->state = F_QUEUED;
 705                 cam->sof.bytesread = 0;
 706                 DBG(3, "Stream interrupted by application");
 707                 wake_up(&cam->wait_stream);
 708         }
 709
 710         if (cam->state & DEV_DISCONNECTED)
 711                 return;
 712
 713         if (cam->state & DEV_MISCONFIGURED) {
 714                 wake_up_interruptible(&cam->wait_frame);
 715                 return;
 716         }
 717
 718         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 719                 goto resubmit_urb;
 720
 721         if (!(*f))
 722                 (*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
 723                                   frame);
 724
 725         imagesize = (cam->sensor.pix_format.width *
 726                      cam->sensor.pix_format.height *
 727                      cam->sensor.pix_format.priv) / 8;
 728         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
 729                 imagesize += 589; /* length of jpeg header */
 730         soflen = sn9c102_sof_length(cam);
 731
 732         for (i = 0; i < urb->number_of_packets; i++) {
 733                 unsigned int img, len, status;
 734                 void *pos, *sof, *eof;
 735
 736                 len = urb->iso_frame_desc[i].actual_length;
 737                 status = urb->iso_frame_desc[i].status;
 738                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 739
 740                 if (status) {
 741                         DBG(3, "Error in isochronous frame");
 742                         (*f)->state = F_ERROR;
 743                         cam->sof.bytesread = 0;
 744                         continue;
 745                 }
 746
 747                 PDBGG("Isochrnous frame: length %u, #%u i", len, i);
 748
 749 redo:
 750                 sof = sn9c102_find_sof_header(cam, pos, len);
 751                 if (likely(!sof)) {
 752                         eof = sn9c102_find_eof_header(cam, pos, len);
 753                         if ((*f)->state == F_GRABBING) {
 754 end_of_frame:
 755                                 img = len;
 756
 757                                 if (eof)
 758                                         img = (eof > pos) ? eof - pos - 1 : 0;
 759
 760                                 if ((*f)->buf.bytesused + img > imagesize) {
 761                                         u32 b;
 762                                         b = (*f)->buf.bytesused + img -
 763                                             imagesize;
 764                                         img = imagesize - (*f)->buf.bytesused;
 765                                         PDBGG("Expected EOF not found: video "
 766                                               "frame cut");
 767                                         if (eof)
 768                                                 DBG(3, "Exceeded limit: +%u "
 769                                                        "bytes", (unsigned)(b));
 770                                 }
 771
 772                                 memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
 773                                        img);
 774
 775                                 if ((*f)->buf.bytesused == 0)
 776                                         do_gettimeofday(&(*f)->buf.timestamp);
 777
 778                                 (*f)->buf.bytesused += img;
 779
 780                                 if ((*f)->buf.bytesused == imagesize ||
 781                                     ((cam->sensor.pix_format.pixelformat ==
 782                                       V4L2_PIX_FMT_SN9C10X ||
 783                                       cam->sensor.pix_format.pixelformat ==
 784                                       V4L2_PIX_FMT_JPEG) && eof)) {
 785                                         u32 b;
 786
 787                                         b = (*f)->buf.bytesused;
 788                                         (*f)->state = F_DONE;
 789                                         (*f)->buf.sequence= ++cam->frame_count;
 790
 791                                         spin_lock(&cam->queue_lock);
 792                                         list_move_tail(&(*f)->frame,
 793                                                        &cam->outqueue);
 794                                         if (!list_empty(&cam->inqueue))
 795                                                 (*f) = list_entry(
 796                                                         cam->inqueue.next,
 797                                                         struct sn9c102_frame_t,
 798                                                         frame );
 799                                         else
 800                                                 (*f) = NULL;
 801                                         spin_unlock(&cam->queue_lock);
 802
 803                                         memcpy(cam->sysfs.frame_header,
 804                                                cam->sof.header, soflen);
 805
 806                                         DBG(3, "Video frame captured: %lu "
 807                                                "bytes", (unsigned long)(b));
 808
 809                                         if (!(*f))
 810                                                 goto resubmit_urb;
 811
 812                                 } else if (eof) {
 813                                         (*f)->state = F_ERROR;
 814                                         DBG(3, "Not expected EOF after %lu "
 815                                                "bytes of image data",
 816                                             (unsigned long)
 817                                             ((*f)->buf.bytesused));
 818                                 }
 819
 820                                 if (sof) /* (1) */
 821                                         goto start_of_frame;
 822
 823                         } else if (eof) {
 824                                 DBG(3, "EOF without SOF");
 825                                 continue;
 826
 827                         } else {
 828                                 PDBGG("Ignoring pointless isochronous frame");
 829                                 continue;
 830                         }
 831
 832                 } else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
 833 start_of_frame:
 834                         (*f)->state = F_GRABBING;
 835                         (*f)->buf.bytesused = 0;
 836                         len -= (sof - pos);
 837                         pos = sof;
 838                         if (cam->sensor.pix_format.pixelformat ==
 839                             V4L2_PIX_FMT_JPEG)
 840                                 sn9c102_write_jpegheader(cam, (*f));
 841                         DBG(3, "SOF detected: new video frame");
 842                         if (len)
 843                                 goto redo;
 844
 845                 } else if ((*f)->state == F_GRABBING) {
 846                         eof = sn9c102_find_eof_header(cam, pos, len);
 847                         if (eof && eof < sof)
 848                                 goto end_of_frame; /* (1) */
 849                         else {
 850                                 if (cam->sensor.pix_format.pixelformat ==
 851                                     V4L2_PIX_FMT_SN9C10X ||
 852                                     cam->sensor.pix_format.pixelformat ==
 853                                     V4L2_PIX_FMT_JPEG) {
 854                                         if (sof - pos >= soflen) {
 855                                                 eof = sof - soflen;
 856                                         } else { /* remove header */
 857                                                 eof = pos;
 858                                                 (*f)->buf.bytesused -=
 859                                                         (soflen - (sof - pos));
 860                                         }
 861                                         goto end_of_frame;
 862                                 } else {
 863                                         DBG(3, "SOF before expected EOF after "
 864                                                "%lu bytes of image data",
 865                                             (unsigned long)
 866                                             ((*f)->buf.bytesused));
 867                                         goto start_of_frame;
 868                                 }
 869                         }
 870                 }
 871         }
 872
 873 resubmit_urb:
 874         urb->dev = cam->usbdev;
 875         err = usb_submit_urb(urb, GFP_ATOMIC);
 876         if (err < 0 && err != -EPERM) {
 877                 cam->state |= DEV_MISCONFIGURED;
 878                 DBG(1, "usb_submit_urb() failed");
 879         }
 880
 881         wake_up_interruptible(&cam->wait_frame);
 882 }
 883
 884
 885 static int sn9c102_start_transfer(struct sn9c102_device* cam)
 886 {
 887         struct usb_device *udev = cam->usbdev;
 888         struct urb* urb;
 889         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 890                                                     usb_ifnum_to_if(udev, 0),
 891                                                     SN9C102_ALTERNATE_SETTING);
 892         const unsigned int psz = le16_to_cpu(altsetting->
 893                                              endpoint[0].desc.wMaxPacketSize);
 894         s8 i, j;
 895         int err = 0;
 896
 897         for (i = 0; i < SN9C102_URBS; i++) {
 898                 cam->transfer_buffer[i] = kzalloc(SN9C102_ISO_PACKETS * psz,
 899                                                   GFP_KERNEL);
 900                 if (!cam->transfer_buffer[i]) {
 901                         err = -ENOMEM;
 902                         DBG(1, "Not enough memory");
 903                         goto free_buffers;
 904                 }
 905         }
 906
 907         for (i = 0; i < SN9C102_URBS; i++) {
 908                 urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
 909                 cam->urb[i] = urb;
 910                 if (!urb) {
 911                         err = -ENOMEM;
 912                         DBG(1, "usb_alloc_urb() failed");
 913                         goto free_urbs;
 914                 }
 915                 urb->dev = udev;
 916                 urb->context = cam;
 917                 urb->pipe = usb_rcvisocpipe(udev, 1);
 918                 urb->transfer_flags = URB_ISO_ASAP;
 919                 urb->number_of_packets = SN9C102_ISO_PACKETS;
 920                 urb->complete = sn9c102_urb_complete;
 921                 urb->transfer_buffer = cam->transfer_buffer[i];
 922                 urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
 923                 urb->interval = 1;
 924                 for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
 925                         urb->iso_frame_desc[j].offset = psz * j;
 926                         urb->iso_frame_desc[j].length = psz;
 927                 }
 928         }
 929
 930         /* Enable video */
 931         if (!(cam->reg[0x01] & 0x04)) {
 932                 err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
 933                 if (err) {
 934                         err = -EIO;
 935                         DBG(1, "I/O hardware error");
 936                         goto free_urbs;
 937                 }
 938         }
 939
 940         err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
 941         if (err) {
 942                 DBG(1, "usb_set_interface() failed");
 943                 goto free_urbs;
 944         }
 945
 946         cam->frame_current = NULL;
 947         cam->sof.bytesread = 0;
 948
 949         for (i = 0; i < SN9C102_URBS; i++) {
 950                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 951                 if (err) {
 952                         for (j = i-1; j >= 0; j--)
 953                                 usb_kill_urb(cam->urb[j]);
 954                         DBG(1, "usb_submit_urb() failed, error %d", err);
 955                         goto free_urbs;
 956                 }
 957         }
 958
 959         return 0;
 960
 961 free_urbs:
 962         for (i = 0; (i < SN9C102_URBS) && cam->urb[i]; i++)
 963                 usb_free_urb(cam->urb[i]);
 964
 965 free_buffers:
 966         for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
 967                 kfree(cam->transfer_buffer[i]);
 968
 969         return err;
 970 }
 971
 972
 973 static int sn9c102_stop_transfer(struct sn9c102_device* cam)
 974 {
 975         struct usb_device *udev = cam->usbdev;
 976         s8 i;
 977         int err = 0;
 978
 979         if (cam->state & DEV_DISCONNECTED)
 980                 return 0;
 981
 982         for (i = SN9C102_URBS-1; i >= 0; i--) {
 983                 usb_kill_urb(cam->urb[i]);
 984                 usb_free_urb(cam->urb[i]);
 985                 kfree(cam->transfer_buffer[i]);
 986         }
 987
 988         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 989         if (err)
 990                 DBG(3, "usb_set_interface() failed");
 991
 992         return err;
 993 }
 994
 995
 996 static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
 997 {
 998         long timeout;
 999
1000         cam->stream = STREAM_INTERRUPT;
1001         timeout = wait_event_timeout(cam->wait_stream,
1002                                      (cam->stream == STREAM_OFF) ||
1003                                      (cam->state & DEV_DISCONNECTED),
1004                                      SN9C102_URB_TIMEOUT);
1005         if (cam->state & DEV_DISCONNECTED)
1006                 return -ENODEV;
1007         else if (cam->stream != STREAM_OFF) {
1008                 cam->state |= DEV_MISCONFIGURED;
1009                 DBG(1, "URB timeout reached. The camera is misconfigured. "
1010                        "To use it, close and open %s again.",
1011                     video_device_node_name(cam->v4ldev));
1012                 return -EIO;
1013         }
1014
1015         return 0;
1016 }
1017
1018 /*****************************************************************************/
1019
1020 #ifdef CONFIG_VIDEO_ADV_DEBUG
1021 static u16 sn9c102_strtou16(const char* buff, size_t len, ssize_t* count)
1022 {
1023         char str[7];
1024         char* endp;
1025         unsigned long val;
1026
1027         if (len < 6) {
1028                 strncpy(str, buff, len);
1029                 str[len] = '\0';
1030         } else {
1031                 strncpy(str, buff, 6);
1032                 str[6] = '\0';
1033         }
1034
1035         val = simple_strtoul(str, &endp, 0);
1036
1037         *count = 0;
1038         if (val <= 0xffff)
1039                 *count = (ssize_t)(endp - str);
1040         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
1041                 *count += 1;
1042
1043         return (u16)val;
1044 }
1045
1046 /*
1047    NOTE 1: being inside one of the following methods implies that the v4l
1048            device exists for sure (see kobjects and reference counters)
1049    NOTE 2: buffers are PAGE_SIZE long
1050 */
1051
1052 static ssize_t sn9c102_show_reg(struct device* cd,
1053                                 struct device_attribute *attr, char* buf)
1054 {
1055         struct sn9c102_device* cam;
1056         ssize_t count;
1057
1058         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1059                 return -ERESTARTSYS;
1060
1061         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1062         if (!cam) {
1063                 mutex_unlock(&sn9c102_sysfs_lock);
1064                 return -ENODEV;
1065         }
1066
1067         count = sprintf(buf, "%u\n", cam->sysfs.reg);
1068
1069         mutex_unlock(&sn9c102_sysfs_lock);
1070
1071         return count;
1072 }
1073
1074
1075 static ssize_t
1076 sn9c102_store_reg(struct device* cd, struct device_attribute *attr,
1077                   const char* buf, size_t len)
1078 {
1079         struct sn9c102_device* cam;
1080         u16 index;
1081         ssize_t count;
1082
1083         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1084                 return -ERESTARTSYS;
1085
1086         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1087         if (!cam) {
1088                 mutex_unlock(&sn9c102_sysfs_lock);
1089                 return -ENODEV;
1090         }
1091
1092         index = sn9c102_strtou16(buf, len, &count);
1093         if (index >= ARRAY_SIZE(cam->reg) || !count) {
1094                 mutex_unlock(&sn9c102_sysfs_lock);
1095                 return -EINVAL;
1096         }
1097
1098         cam->sysfs.reg = index;
1099
1100         DBG(2, "Moved SN9C1XX register index to 0x%02X", cam->sysfs.reg);
1101         DBG(3, "Written bytes: %zd", count);
1102
1103         mutex_unlock(&sn9c102_sysfs_lock);
1104
1105         return count;
1106 }
1107
1108
1109 static ssize_t sn9c102_show_val(struct device* cd,
1110                                 struct device_attribute *attr, char* buf)
1111 {
1112         struct sn9c102_device* cam;
1113         ssize_t count;
1114         int val;
1115
1116         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1117                 return -ERESTARTSYS;
1118
1119         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1120         if (!cam) {
1121                 mutex_unlock(&sn9c102_sysfs_lock);
1122                 return -ENODEV;
1123         }
1124
1125         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
1126                 mutex_unlock(&sn9c102_sysfs_lock);
1127                 return -EIO;
1128         }
1129
1130         count = sprintf(buf, "%d\n", val);
1131
1132         DBG(3, "Read bytes: %zd, value: %d", count, val);
1133
1134         mutex_unlock(&sn9c102_sysfs_lock);
1135
1136         return count;
1137 }
1138
1139
1140 static ssize_t
1141 sn9c102_store_val(struct device* cd, struct device_attribute *attr,
1142                   const char* buf, size_t len)
1143 {
1144         struct sn9c102_device* cam;
1145         u16 value;
1146         ssize_t count;
1147         int err;
1148
1149         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1150                 return -ERESTARTSYS;
1151
1152         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1153         if (!cam) {
1154                 mutex_unlock(&sn9c102_sysfs_lock);
1155                 return -ENODEV;
1156         }
1157
1158         value = sn9c102_strtou16(buf, len, &count);
1159         if (!count) {
1160                 mutex_unlock(&sn9c102_sysfs_lock);
1161                 return -EINVAL;
1162         }
1163
1164         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
1165         if (err) {
1166                 mutex_unlock(&sn9c102_sysfs_lock);
1167                 return -EIO;
1168         }
1169
1170         DBG(2, "Written SN9C1XX reg. 0x%02X, val. 0x%02X",
1171             cam->sysfs.reg, value);
1172         DBG(3, "Written bytes: %zd", count);
1173
1174         mutex_unlock(&sn9c102_sysfs_lock);
1175
1176         return count;
1177 }
1178
1179
1180 static ssize_t sn9c102_show_i2c_reg(struct device* cd,
1181                                     struct device_attribute *attr, char* buf)
1182 {
1183         struct sn9c102_device* cam;
1184         ssize_t count;
1185
1186         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1187                 return -ERESTARTSYS;
1188
1189         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1190         if (!cam) {
1191                 mutex_unlock(&sn9c102_sysfs_lock);
1192                 return -ENODEV;
1193         }
1194
1195         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1196
1197         DBG(3, "Read bytes: %zd", count);
1198
1199         mutex_unlock(&sn9c102_sysfs_lock);
1200
1201         return count;
1202 }
1203
1204
1205 static ssize_t
1206 sn9c102_store_i2c_reg(struct device* cd, struct device_attribute *attr,
1207                       const char* buf, size_t len)
1208 {
1209         struct sn9c102_device* cam;
1210         u16 index;
1211         ssize_t count;
1212
1213         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1214                 return -ERESTARTSYS;
1215
1216         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1217         if (!cam) {
1218                 mutex_unlock(&sn9c102_sysfs_lock);
1219                 return -ENODEV;
1220         }
1221
1222         index = sn9c102_strtou16(buf, len, &count);
1223         if (!count) {
1224                 mutex_unlock(&sn9c102_sysfs_lock);
1225                 return -EINVAL;
1226         }
1227
1228         cam->sysfs.i2c_reg = index;
1229
1230         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1231         DBG(3, "Written bytes: %zd", count);
1232
1233         mutex_unlock(&sn9c102_sysfs_lock);
1234
1235         return count;
1236 }
1237
1238
1239 static ssize_t sn9c102_show_i2c_val(struct device* cd,
1240                                     struct device_attribute *attr, char* buf)
1241 {
1242         struct sn9c102_device* cam;
1243         ssize_t count;
1244         int val;
1245
1246         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1247                 return -ERESTARTSYS;
1248
1249         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1250         if (!cam) {
1251                 mutex_unlock(&sn9c102_sysfs_lock);
1252                 return -ENODEV;
1253         }
1254
1255         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
1256                 mutex_unlock(&sn9c102_sysfs_lock);
1257                 return -ENOSYS;
1258         }
1259
1260         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1261                 mutex_unlock(&sn9c102_sysfs_lock);
1262                 return -EIO;
1263         }
1264
1265         count = sprintf(buf, "%d\n", val);
1266
1267         DBG(3, "Read bytes: %zd, value: %d", count, val);
1268
1269         mutex_unlock(&sn9c102_sysfs_lock);
1270
1271         return count;
1272 }
1273
1274
1275 static ssize_t
1276 sn9c102_store_i2c_val(struct device* cd, struct device_attribute *attr,
1277                       const char* buf, size_t len)
1278 {
1279         struct sn9c102_device* cam;
1280         u16 value;
1281         ssize_t count;
1282         int err;
1283
1284         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1285                 return -ERESTARTSYS;
1286
1287         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1288         if (!cam) {
1289                 mutex_unlock(&sn9c102_sysfs_lock);
1290                 return -ENODEV;
1291         }
1292
1293         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
1294                 mutex_unlock(&sn9c102_sysfs_lock);
1295                 return -ENOSYS;
1296         }
1297
1298         value = sn9c102_strtou16(buf, len, &count);
1299         if (!count) {
1300                 mutex_unlock(&sn9c102_sysfs_lock);
1301                 return -EINVAL;
1302         }
1303
1304         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1305         if (err) {
1306                 mutex_unlock(&sn9c102_sysfs_lock);
1307                 return -EIO;
1308         }
1309
1310         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1311             cam->sysfs.i2c_reg, value);
1312         DBG(3, "Written bytes: %zd", count);
1313
1314         mutex_unlock(&sn9c102_sysfs_lock);
1315
1316         return count;
1317 }
1318
1319
1320 static ssize_t
1321 sn9c102_store_green(struct device* cd, struct device_attribute *attr,
1322                     const char* buf, size_t len)
1323 {
1324         struct sn9c102_device* cam;
1325         enum sn9c102_bridge bridge;
1326         ssize_t res = 0;
1327         u16 value;
1328         ssize_t count;
1329
1330         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1331                 return -ERESTARTSYS;
1332
1333         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1334         if (!cam) {
1335                 mutex_unlock(&sn9c102_sysfs_lock);
1336                 return -ENODEV;
1337         }
1338
1339         bridge = cam->bridge;
1340
1341         mutex_unlock(&sn9c102_sysfs_lock);
1342
1343         value = sn9c102_strtou16(buf, len, &count);
1344         if (!count)
1345                 return -EINVAL;
1346
1347         switch (bridge) {
1348         case BRIDGE_SN9C101:
1349         case BRIDGE_SN9C102:
1350                 if (value > 0x0f)
1351                         return -EINVAL;
1352                 if ((res = sn9c102_store_reg(cd, attr, "0x11", 4)) >= 0)
1353                         res = sn9c102_store_val(cd, attr, buf, len);
1354                 break;
1355         case BRIDGE_SN9C103:
1356         case BRIDGE_SN9C105:
1357         case BRIDGE_SN9C120:
1358                 if (value > 0x7f)
1359                         return -EINVAL;
1360                 if ((res = sn9c102_store_reg(cd, attr, "0x07", 4)) >= 0)
1361                         res = sn9c102_store_val(cd, attr, buf, len);
1362                 break;
1363         }
1364
1365         return res;
1366 }
1367
1368
1369 static ssize_t
1370 sn9c102_store_blue(struct device* cd, struct device_attribute *attr,
1371                    const char* buf, size_t len)
1372 {
1373         ssize_t res = 0;
1374         u16 value;
1375         ssize_t count;
1376
1377         value = sn9c102_strtou16(buf, len, &count);
1378         if (!count || value > 0x7f)
1379                 return -EINVAL;
1380
1381         if ((res = sn9c102_store_reg(cd, attr, "0x06", 4)) >= 0)
1382                 res = sn9c102_store_val(cd, attr, buf, len);
1383
1384         return res;
1385 }
1386
1387
1388 static ssize_t
1389 sn9c102_store_red(struct device* cd, struct device_attribute *attr,
1390                   const char* buf, size_t len)
1391 {
1392         ssize_t res = 0;
1393         u16 value;
1394         ssize_t count;
1395
1396         value = sn9c102_strtou16(buf, len, &count);
1397         if (!count || value > 0x7f)
1398                 return -EINVAL;
1399
1400         if ((res = sn9c102_store_reg(cd, attr, "0x05", 4)) >= 0)
1401                 res = sn9c102_store_val(cd, attr, buf, len);
1402
1403         return res;
1404 }
1405
1406
1407 static ssize_t sn9c102_show_frame_header(struct device* cd,
1408                                          struct device_attribute *attr,
1409                                          char* buf)
1410 {
1411         struct sn9c102_device* cam;
1412         ssize_t count;
1413
1414         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1415         if (!cam)
1416                 return -ENODEV;
1417
1418         count = sizeof(cam->sysfs.frame_header);
1419         memcpy(buf, cam->sysfs.frame_header, count);
1420
1421         DBG(3, "Frame header, read bytes: %zd", count);
1422
1423         return count;
1424 }
1425
1426
1427 static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR, sn9c102_show_reg, sn9c102_store_reg);
1428 static DEVICE_ATTR(val, S_IRUGO | S_IWUSR, sn9c102_show_val, sn9c102_store_val);
1429 static DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1430                    sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1431 static DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1432                    sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1433 static DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
1434 static DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
1435 static DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
1436 static DEVICE_ATTR(frame_header, S_IRUGO, sn9c102_show_frame_header, NULL);
1437
1438
1439 static int sn9c102_create_sysfs(struct sn9c102_device* cam)
1440 {
1441         struct device *dev = &(cam->v4ldev->dev);
1442         int err = 0;
1443
1444         if ((err = device_create_file(dev, &dev_attr_reg)))
1445                 goto err_out;
1446         if ((err = device_create_file(dev, &dev_attr_val)))
1447                 goto err_reg;
1448         if ((err = device_create_file(dev, &dev_attr_frame_header)))
1449                 goto err_val;
1450
1451         if (cam->sensor.sysfs_ops) {
1452                 if ((err = device_create_file(dev, &dev_attr_i2c_reg)))
1453                         goto err_frame_header;
1454                 if ((err = device_create_file(dev, &dev_attr_i2c_val)))
1455                         goto err_i2c_reg;
1456         }
1457
1458         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
1459                 if ((err = device_create_file(dev, &dev_attr_green)))
1460                         goto err_i2c_val;
1461         } else {
1462                 if ((err = device_create_file(dev, &dev_attr_blue)))
1463                         goto err_i2c_val;
1464                 if ((err = device_create_file(dev, &dev_attr_red)))
1465                         goto err_blue;
1466         }
1467
1468         return 0;
1469
1470 err_blue:
1471         device_remove_file(dev, &dev_attr_blue);
1472 err_i2c_val:
1473         if (cam->sensor.sysfs_ops)
1474                 device_remove_file(dev, &dev_attr_i2c_val);
1475 err_i2c_reg:
1476         if (cam->sensor.sysfs_ops)
1477                 device_remove_file(dev, &dev_attr_i2c_reg);
1478 err_frame_header:
1479         device_remove_file(dev, &dev_attr_frame_header);
1480 err_val:
1481         device_remove_file(dev, &dev_attr_val);
1482 err_reg:
1483         device_remove_file(dev, &dev_attr_reg);
1484 err_out:
1485         return err;
1486 }
1487 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1488
1489 /*****************************************************************************/
1490
1491 static int
1492 sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
1493 {
1494         int err = 0;
1495
1496         if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
1497             pix->pixelformat == V4L2_PIX_FMT_JPEG) {
1498                 switch (cam->bridge) {
1499                 case BRIDGE_SN9C101:
1500                 case BRIDGE_SN9C102:
1501                 case BRIDGE_SN9C103:
1502                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1503                                                  0x18);
1504                         break;
1505                 case BRIDGE_SN9C105:
1506                 case BRIDGE_SN9C120:
1507                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1508                                                  0x18);
1509                         break;
1510                 }
1511         } else {
1512                 switch (cam->bridge) {
1513                 case BRIDGE_SN9C101:
1514                 case BRIDGE_SN9C102:
1515                 case BRIDGE_SN9C103:
1516                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1517                                                  0x18);
1518                         break;
1519                 case BRIDGE_SN9C105:
1520                 case BRIDGE_SN9C120:
1521                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1522                                                  0x18);
1523                         break;
1524                 }
1525         }
1526
1527         return err ? -EIO : 0;
1528 }
1529
1530
1531 static int
1532 sn9c102_set_compression(struct sn9c102_device* cam,
1533                         struct v4l2_jpegcompression* compression)
1534 {
1535         int i, err = 0;
1536
1537         switch (cam->bridge) {
1538         case BRIDGE_SN9C101:
1539         case BRIDGE_SN9C102:
1540         case BRIDGE_SN9C103:
1541                 if (compression->quality == 0)
1542                         err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01,
1543                                                  0x17);
1544                 else if (compression->quality == 1)
1545                         err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe,
1546                                                  0x17);
1547                 break;
1548         case BRIDGE_SN9C105:
1549         case BRIDGE_SN9C120:
1550                 if (compression->quality == 0) {
1551                         for (i = 0; i <= 63; i++) {
1552                                 err += sn9c102_write_reg(cam,
1553                                                          SN9C102_Y_QTABLE1[i],
1554                                                          0x100 + i);
1555                                 err += sn9c102_write_reg(cam,
1556                                                          SN9C102_UV_QTABLE1[i],
1557                                                          0x140 + i);
1558                         }
1559                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0xbf,
1560                                                  0x18);
1561                 } else if (compression->quality == 1) {
1562                         for (i = 0; i <= 63; i++) {
1563                                 err += sn9c102_write_reg(cam,
1564                                                          SN9C102_Y_QTABLE1[i],
1565                                                          0x100 + i);
1566                                 err += sn9c102_write_reg(cam,
1567                                                          SN9C102_UV_QTABLE1[i],
1568                                                          0x140 + i);
1569                         }
1570                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x40,
1571                                                  0x18);
1572                 }
1573                 break;
1574         }
1575
1576         return err ? -EIO : 0;
1577 }
1578
1579
1580 static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
1581 {
1582         u8 r = 0;
1583         int err = 0;
1584
1585         if (scale == 1)
1586                 r = cam->reg[0x18] & 0xcf;
1587         else if (scale == 2) {
1588                 r = cam->reg[0x18] & 0xcf;
1589                 r |= 0x10;
1590         } else if (scale == 4)
1591                 r = cam->reg[0x18] | 0x20;
1592
1593         err += sn9c102_write_reg(cam, r, 0x18);
1594         if (err)
1595                 return -EIO;
1596
1597         PDBGG("Scaling factor: %u", scale);
1598
1599         return 0;
1600 }
1601
1602
1603 static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
1604 {
1605         struct sn9c102_sensor* s = &cam->sensor;
1606         u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
1607            v_start = (u8)(rect->top - s->cropcap.bounds.top),
1608            h_size = (u8)(rect->width / 16),
1609            v_size = (u8)(rect->height / 16);
1610         int err = 0;
1611
1612         err += sn9c102_write_reg(cam, h_start, 0x12);
1613         err += sn9c102_write_reg(cam, v_start, 0x13);
1614         err += sn9c102_write_reg(cam, h_size, 0x15);
1615         err += sn9c102_write_reg(cam, v_size, 0x16);
1616         if (err)
1617                 return -EIO;
1618
1619         PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
1620               "%u %u %u %u", h_start, v_start, h_size, v_size);
1621
1622         return 0;
1623 }
1624
1625
1626 static int sn9c102_init(struct sn9c102_device* cam)
1627 {
1628         struct sn9c102_sensor* s = &cam->sensor;
1629         struct v4l2_control ctrl;
1630         struct v4l2_queryctrl *qctrl;
1631         struct v4l2_rect* rect;
1632         u8 i = 0;
1633         int err = 0;
1634
1635         if (!(cam->state & DEV_INITIALIZED)) {
1636                 mutex_init(&cam->open_mutex);
1637                 init_waitqueue_head(&cam->wait_open);
1638                 qctrl = s->qctrl;
1639                 rect = &(s->cropcap.defrect);
1640         } else { /* use current values */
1641                 qctrl = s->_qctrl;
1642                 rect = &(s->_rect);
1643         }
1644
1645         err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
1646         err += sn9c102_set_crop(cam, rect);
1647         if (err)
1648                 return err;
1649
1650         if (s->init) {
1651                 err = s->init(cam);
1652                 if (err) {
1653                         DBG(3, "Sensor initialization failed");
1654                         return err;
1655                 }
1656         }
1657
1658         if (!(cam->state & DEV_INITIALIZED))
1659                 if (cam->bridge == BRIDGE_SN9C101 ||
1660                     cam->bridge == BRIDGE_SN9C102 ||
1661                     cam->bridge == BRIDGE_SN9C103) {
1662                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1663                                 s->pix_format.pixelformat= V4L2_PIX_FMT_SBGGR8;
1664                         cam->compression.quality =  cam->reg[0x17] & 0x01 ?
1665                                                     0 : 1;
1666                 } else {
1667                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
1668                                 s->pix_format.pixelformat = V4L2_PIX_FMT_JPEG;
1669                         cam->compression.quality =  cam->reg[0x18] & 0x40 ?
1670                                                     0 : 1;
1671                         err += sn9c102_set_compression(cam, &cam->compression);
1672                 }
1673         else
1674                 err += sn9c102_set_compression(cam, &cam->compression);
1675         err += sn9c102_set_pix_format(cam, &s->pix_format);
1676         if (s->set_pix_format)
1677                 err += s->set_pix_format(cam, &s->pix_format);
1678         if (err)
1679                 return err;
1680
1681         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X ||
1682             s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1683                 DBG(3, "Compressed video format is active, quality %d",
1684                     cam->compression.quality);
1685         else
1686                 DBG(3, "Uncompressed video format is active");
1687
1688         if (s->set_crop)
1689                 if ((err = s->set_crop(cam, rect))) {
1690                         DBG(3, "set_crop() failed");
1691                         return err;
1692                 }
1693
1694         if (s->set_ctrl) {
1695                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1696                         if (s->qctrl[i].id != 0 &&
1697                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1698                                 ctrl.id = s->qctrl[i].id;
1699                                 ctrl.value = qctrl[i].default_value;
1700                                 err = s->set_ctrl(cam, &ctrl);
1701                                 if (err) {
1702                                         DBG(3, "Set %s control failed",
1703                                             s->qctrl[i].name);
1704                                         return err;
1705                                 }
1706                                 DBG(3, "Image sensor supports '%s' control",
1707                                     s->qctrl[i].name);
1708                         }
1709         }
1710
1711         if (!(cam->state & DEV_INITIALIZED)) {
1712                 mutex_init(&cam->fileop_mutex);
1713                 spin_lock_init(&cam->queue_lock);
1714                 init_waitqueue_head(&cam->wait_frame);
1715                 init_waitqueue_head(&cam->wait_stream);
1716                 cam->nreadbuffers = 2;
1717                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1718                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1719                        sizeof(struct v4l2_rect));
1720                 cam->state |= DEV_INITIALIZED;
1721         }
1722
1723         DBG(2, "Initialization succeeded");
1724         return 0;
1725 }
1726
1727 /*****************************************************************************/
1728
1729 static void sn9c102_release_resources(struct kref *kref)
1730 {
1731         struct sn9c102_device *cam;
1732
1733         mutex_lock(&sn9c102_sysfs_lock);
1734
1735         cam = container_of(kref, struct sn9c102_device, kref);
1736
1737         DBG(2, "V4L2 device %s deregistered",
1738             video_device_node_name(cam->v4ldev));
1739         video_set_drvdata(cam->v4ldev, NULL);
1740         video_unregister_device(cam->v4ldev);
1741         usb_put_dev(cam->usbdev);
1742         kfree(cam->control_buffer);
1743         kfree(cam);
1744
1745         mutex_unlock(&sn9c102_sysfs_lock);
1746
1747 }
1748
1749
1750 static int sn9c102_open(struct file *filp)
1751 {
1752         struct sn9c102_device* cam;
1753         int err = 0;
1754
1755         /*
1756            A read_trylock() in open() is the only safe way to prevent race
1757            conditions with disconnect(), one close() and multiple (not
1758            necessarily simultaneous) attempts to open(). For example, it
1759            prevents from waiting for a second access, while the device
1760            structure is being deallocated, after a possible disconnect() and
1761            during a following close() holding the write lock: given that, after
1762            this deallocation, no access will be possible anymore, using the
1763            non-trylock version would have let open() gain the access to the
1764            device structure improperly.
1765            For this reason the lock must also not be per-device.
1766         */
1767         if (!down_read_trylock(&sn9c102_dev_lock))
1768                 return -ERESTARTSYS;
1769
1770         cam = video_drvdata(filp);
1771
1772         if (wait_for_completion_interruptible(&cam->probe)) {
1773                 up_read(&sn9c102_dev_lock);
1774                 return -ERESTARTSYS;
1775         }
1776
1777         kref_get(&cam->kref);
1778
1779         /*
1780             Make sure to isolate all the simultaneous opens.
1781         */
1782         if (mutex_lock_interruptible(&cam->open_mutex)) {
1783                 kref_put(&cam->kref, sn9c102_release_resources);
1784                 up_read(&sn9c102_dev_lock);
1785                 return -ERESTARTSYS;
1786         }
1787
1788         if (cam->state & DEV_DISCONNECTED) {
1789                 DBG(1, "Device not present");
1790                 err = -ENODEV;
1791                 goto out;
1792         }
1793
1794         if (cam->users) {
1795                 DBG(2, "Device %s is already in use",
1796                     video_device_node_name(cam->v4ldev));
1797                 DBG(3, "Simultaneous opens are not supported");
1798                 /*
1799                    open() must follow the open flags and should block
1800                    eventually while the device is in use.
1801                 */
1802                 if ((filp->f_flags & O_NONBLOCK) ||
1803                     (filp->f_flags & O_NDELAY)) {
1804                         err = -EWOULDBLOCK;
1805                         goto out;
1806                 }
1807                 DBG(2, "A blocking open() has been requested. Wait for the "
1808                        "device to be released...");
1809                 up_read(&sn9c102_dev_lock);
1810                 /*
1811                    We will not release the "open_mutex" lock, so that only one
1812                    process can be in the wait queue below. This way the process
1813                    will be sleeping while holding the lock, without loosing its
1814                    priority after any wake_up().
1815                 */
1816                 err = wait_event_interruptible_exclusive(cam->wait_open,
1817                                                 (cam->state & DEV_DISCONNECTED)
1818                                                          || !cam->users);
1819                 down_read(&sn9c102_dev_lock);
1820                 if (err)
1821                         goto out;
1822                 if (cam->state & DEV_DISCONNECTED) {
1823                         err = -ENODEV;
1824                         goto out;
1825                 }
1826         }
1827
1828         if (cam->state & DEV_MISCONFIGURED) {
1829                 err = sn9c102_init(cam);
1830                 if (err) {
1831                         DBG(1, "Initialization failed again. "
1832                                "I will retry on next open().");
1833                         goto out;
1834                 }
1835                 cam->state &= ~DEV_MISCONFIGURED;
1836         }
1837
1838         if ((err = sn9c102_start_transfer(cam)))
1839                 goto out;
1840
1841         filp->private_data = cam;
1842         cam->users++;
1843         cam->io = IO_NONE;
1844         cam->stream = STREAM_OFF;
1845         cam->nbuffers = 0;
1846         cam->frame_count = 0;
1847         sn9c102_empty_framequeues(cam);
1848
1849         DBG(3, "Video device %s is open", video_device_node_name(cam->v4ldev));
1850
1851 out:
1852         mutex_unlock(&cam->open_mutex);
1853         if (err)
1854                 kref_put(&cam->kref, sn9c102_release_resources);
1855
1856         up_read(&sn9c102_dev_lock);
1857         return err;
1858 }
1859
1860
1861 static int sn9c102_release(struct file *filp)
1862 {
1863         struct sn9c102_device* cam;
1864
1865         down_write(&sn9c102_dev_lock);
1866
1867         cam = video_drvdata(filp);
1868
1869         sn9c102_stop_transfer(cam);
1870         sn9c102_release_buffers(cam);
1871         cam->users--;
1872         wake_up_interruptible_nr(&cam->wait_open, 1);
1873
1874         DBG(3, "Video device %s closed", video_device_node_name(cam->v4ldev));
1875
1876         kref_put(&cam->kref, sn9c102_release_resources);
1877
1878         up_write(&sn9c102_dev_lock);
1879
1880         return 0;
1881 }
1882
1883
1884 static ssize_t
1885 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1886 {
1887         struct sn9c102_device *cam = video_drvdata(filp);
1888         struct sn9c102_frame_t* f, * i;
1889         unsigned long lock_flags;
1890         long timeout;
1891         int err = 0;
1892
1893         if (mutex_lock_interruptible(&cam->fileop_mutex))
1894                 return -ERESTARTSYS;
1895
1896         if (cam->state & DEV_DISCONNECTED) {
1897                 DBG(1, "Device not present");
1898                 mutex_unlock(&cam->fileop_mutex);
1899                 return -ENODEV;
1900         }
1901
1902         if (cam->state & DEV_MISCONFIGURED) {
1903                 DBG(1, "The camera is misconfigured. Close and open it "
1904                        "again.");
1905                 mutex_unlock(&cam->fileop_mutex);
1906                 return -EIO;
1907         }
1908
1909         if (cam->io == IO_MMAP) {
1910                 DBG(3, "Close and open the device again to choose "
1911                        "the read method");
1912                 mutex_unlock(&cam->fileop_mutex);
1913                 return -EBUSY;
1914         }
1915
1916         if (cam->io == IO_NONE) {
1917                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1918                         DBG(1, "read() failed, not enough memory");
1919                         mutex_unlock(&cam->fileop_mutex);
1920                         return -ENOMEM;
1921                 }
1922                 cam->io = IO_READ;
1923                 cam->stream = STREAM_ON;
1924         }
1925
1926         if (list_empty(&cam->inqueue)) {
1927                 if (!list_empty(&cam->outqueue))
1928                         sn9c102_empty_framequeues(cam);
1929                 sn9c102_queue_unusedframes(cam);
1930         }
1931
1932         if (!count) {
1933                 mutex_unlock(&cam->fileop_mutex);
1934                 return 0;
1935         }
1936
1937         if (list_empty(&cam->outqueue)) {
1938                 if (filp->f_flags & O_NONBLOCK) {
1939                         mutex_unlock(&cam->fileop_mutex);
1940                         return -EAGAIN;
1941                 }
1942                 if (!cam->module_param.frame_timeout) {
1943                         err = wait_event_interruptible
1944                               ( cam->wait_frame,
1945                                 (!list_empty(&cam->outqueue)) ||
1946                                 (cam->state & DEV_DISCONNECTED) ||
1947                                 (cam->state & DEV_MISCONFIGURED) );
1948                         if (err) {
1949                                 mutex_unlock(&cam->fileop_mutex);
1950                                 return err;
1951                         }
1952                 } else {
1953                         timeout = wait_event_interruptible_timeout
1954                                   ( cam->wait_frame,
1955                                     (!list_empty(&cam->outqueue)) ||
1956                                     (cam->state & DEV_DISCONNECTED) ||
1957                                     (cam->state & DEV_MISCONFIGURED),
1958                                     msecs_to_jiffies(
1959                                         cam->module_param.frame_timeout * 1000
1960                                     )
1961                                   );
1962                         if (timeout < 0) {
1963                                 mutex_unlock(&cam->fileop_mutex);
1964                                 return timeout;
1965                         } else if (timeout == 0 &&
1966                                    !(cam->state & DEV_DISCONNECTED)) {
1967                                 DBG(1, "Video frame timeout elapsed");
1968                                 mutex_unlock(&cam->fileop_mutex);
1969                                 return -EIO;
1970                         }
1971                 }
1972                 if (cam->state & DEV_DISCONNECTED) {
1973                         mutex_unlock(&cam->fileop_mutex);
1974                         return -ENODEV;
1975                 }
1976                 if (cam->state & DEV_MISCONFIGURED) {
1977                         mutex_unlock(&cam->fileop_mutex);
1978                         return -EIO;
1979                 }
1980         }
1981
1982         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1983
1984         if (count > f->buf.bytesused)
1985                 count = f->buf.bytesused;
1986
1987         if (copy_to_user(buf, f->bufmem, count)) {
1988                 err = -EFAULT;
1989                 goto exit;
1990         }
1991         *f_pos += count;
1992
1993 exit:
1994         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1995         list_for_each_entry(i, &cam->outqueue, frame)
1996                 i->state = F_UNUSED;
1997         INIT_LIST_HEAD(&cam->outqueue);
1998         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1999
2000         sn9c102_queue_unusedframes(cam);
2001
2002         PDBGG("Frame #%lu, bytes read: %zu",
2003               (unsigned long)f->buf.index, count);
2004
2005         mutex_unlock(&cam->fileop_mutex);
2006
2007         return count;
2008 }
2009
2010
2011 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
2012 {
2013         struct sn9c102_device *cam = video_drvdata(filp);
2014         struct sn9c102_frame_t* f;
2015         unsigned long lock_flags;
2016         unsigned int mask = 0;
2017
2018         if (mutex_lock_interruptible(&cam->fileop_mutex))
2019                 return POLLERR;
2020
2021         if (cam->state & DEV_DISCONNECTED) {
2022                 DBG(1, "Device not present");
2023                 goto error;
2024         }
2025
2026         if (cam->state & DEV_MISCONFIGURED) {
2027                 DBG(1, "The camera is misconfigured. Close and open it "
2028                        "again.");
2029                 goto error;
2030         }
2031
2032         if (cam->io == IO_NONE) {
2033                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
2034                                              IO_READ)) {
2035                         DBG(1, "poll() failed, not enough memory");
2036                         goto error;
2037                 }
2038                 cam->io = IO_READ;
2039                 cam->stream = STREAM_ON;
2040         }
2041
2042         if (cam->io == IO_READ) {
2043                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
2044                 list_for_each_entry(f, &cam->outqueue, frame)
2045                         f->state = F_UNUSED;
2046                 INIT_LIST_HEAD(&cam->outqueue);
2047                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2048                 sn9c102_queue_unusedframes(cam);
2049         }
2050
2051         poll_wait(filp, &cam->wait_frame, wait);
2052
2053         if (!list_empty(&cam->outqueue))
2054                 mask |= POLLIN | POLLRDNORM;
2055
2056         mutex_unlock(&cam->fileop_mutex);
2057
2058         return mask;
2059
2060 error:
2061         mutex_unlock(&cam->fileop_mutex);
2062         return POLLERR;
2063 }
2064
2065
2066 static void sn9c102_vm_open(struct vm_area_struct* vma)
2067 {
2068         struct sn9c102_frame_t* f = vma->vm_private_data;
2069         f->vma_use_count++;
2070 }
2071
2072
2073 static void sn9c102_vm_close(struct vm_area_struct* vma)
2074 {
2075         /* NOTE: buffers are not freed here */
2076         struct sn9c102_frame_t* f = vma->vm_private_data;
2077         f->vma_use_count--;
2078 }
2079
2080
2081 static const struct vm_operations_struct sn9c102_vm_ops = {
2082         .open = sn9c102_vm_open,
2083         .close = sn9c102_vm_close,
2084 };
2085
2086
2087 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
2088 {
2089         struct sn9c102_device *cam = video_drvdata(filp);
2090         unsigned long size = vma->vm_end - vma->vm_start,
2091                       start = vma->vm_start;
2092         void *pos;
2093         u32 i;
2094
2095         if (mutex_lock_interruptible(&cam->fileop_mutex))
2096                 return -ERESTARTSYS;
2097
2098         if (cam->state & DEV_DISCONNECTED) {
2099                 DBG(1, "Device not present");
2100                 mutex_unlock(&cam->fileop_mutex);
2101                 return -ENODEV;
2102         }
2103
2104         if (cam->state & DEV_MISCONFIGURED) {
2105                 DBG(1, "The camera is misconfigured. Close and open it "
2106                        "again.");
2107                 mutex_unlock(&cam->fileop_mutex);
2108                 return -EIO;
2109         }
2110
2111         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
2112                 mutex_unlock(&cam->fileop_mutex);
2113                 return -EACCES;
2114         }
2115
2116         if (cam->io != IO_MMAP ||
2117             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
2118                 mutex_unlock(&cam->fileop_mutex);
2119                 return -EINVAL;
2120         }
2121
2122         for (i = 0; i < cam->nbuffers; i++) {
2123                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
2124                         break;
2125         }
2126         if (i == cam->nbuffers) {
2127                 mutex_unlock(&cam->fileop_mutex);
2128                 return -EINVAL;
2129         }
2130
2131         vma->vm_flags |= VM_IO;
2132         vma->vm_flags |= VM_RESERVED;
2133
2134         pos = cam->frame[i].bufmem;
2135         while (size > 0) { /* size is page-aligned */
2136                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
2137                         mutex_unlock(&cam->fileop_mutex);
2138                         return -EAGAIN;
2139                 }
2140                 start += PAGE_SIZE;
2141                 pos += PAGE_SIZE;
2142                 size -= PAGE_SIZE;
2143         }
2144
2145         vma->vm_ops = &sn9c102_vm_ops;
2146         vma->vm_private_data = &cam->frame[i];
2147         sn9c102_vm_open(vma);
2148
2149         mutex_unlock(&cam->fileop_mutex);
2150
2151         return 0;
2152 }
2153
2154 /*****************************************************************************/
2155
2156 static int
2157 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
2158 {
2159         struct v4l2_capability cap = {
2160                 .driver = "sn9c102",
2161                 .version = SN9C102_MODULE_VERSION_CODE,
2162                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
2163                                 V4L2_CAP_STREAMING,
2164         };
2165
2166         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
2167         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
2168                 strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
2169                         sizeof(cap.bus_info));
2170
2171         if (copy_to_user(arg, &cap, sizeof(cap)))
2172                 return -EFAULT;
2173
2174         return 0;
2175 }
2176
2177
2178 static int
2179 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
2180 {
2181         struct v4l2_input i;
2182
2183         if (copy_from_user(&i, arg, sizeof(i)))
2184                 return -EFAULT;
2185
2186         if (i.index)
2187                 return -EINVAL;
2188
2189         memset(&i, 0, sizeof(i));
2190         strcpy(i.name, "Camera");
2191         i.type = V4L2_INPUT_TYPE_CAMERA;
2192
2193         if (copy_to_user(arg, &i, sizeof(i)))
2194                 return -EFAULT;
2195
2196         return 0;
2197 }
2198
2199
2200 static int
2201 sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
2202 {
2203         int index = 0;
2204
2205         if (copy_to_user(arg, &index, sizeof(index)))
2206                 return -EFAULT;
2207
2208         return 0;
2209 }
2210
2211
2212 static int
2213 sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
2214 {
2215         int index;
2216
2217         if (copy_from_user(&index, arg, sizeof(index)))
2218                 return -EFAULT;
2219
2220         if (index != 0)
2221                 return -EINVAL;
2222
2223         return 0;
2224 }
2225
2226
2227 static int
2228 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
2229 {
2230         struct sn9c102_sensor* s = &cam->sensor;
2231         struct v4l2_queryctrl qc;
2232         u8 i;
2233
2234         if (copy_from_user(&qc, arg, sizeof(qc)))
2235                 return -EFAULT;
2236
2237         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2238                 if (qc.id && qc.id == s->qctrl[i].id) {
2239                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
2240                         if (copy_to_user(arg, &qc, sizeof(qc)))
2241                                 return -EFAULT;
2242                         return 0;
2243                 }
2244
2245         return -EINVAL;
2246 }
2247
2248
2249 static int
2250 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
2251 {
2252         struct sn9c102_sensor* s = &cam->sensor;
2253         struct v4l2_control ctrl;
2254         int err = 0;
2255         u8 i;
2256
2257         if (!s->get_ctrl && !s->set_ctrl)
2258                 return -EINVAL;
2259
2260         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2261                 return -EFAULT;
2262
2263         if (!s->get_ctrl) {
2264                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2265                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
2266                                 ctrl.value = s->_qctrl[i].default_value;
2267                                 goto exit;
2268                         }
2269                 return -EINVAL;
2270         } else
2271                 err = s->get_ctrl(cam, &ctrl);
2272
2273 exit:
2274         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
2275                 return -EFAULT;
2276
2277         PDBGG("VIDIOC_G_CTRL: id %lu, value %lu",
2278               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
2279
2280         return err;
2281 }
2282
2283
2284 static int
2285 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
2286 {
2287         struct sn9c102_sensor* s = &cam->sensor;
2288         struct v4l2_control ctrl;
2289         u8 i;
2290         int err = 0;
2291
2292         if (!s->set_ctrl)
2293                 return -EINVAL;
2294
2295         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2296                 return -EFAULT;
2297
2298         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) {
2299                 if (ctrl.id == s->qctrl[i].id) {
2300                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
2301                                 return -EINVAL;
2302                         if (ctrl.value < s->qctrl[i].minimum ||
2303                             ctrl.value > s->qctrl[i].maximum)
2304                                 return -ERANGE;
2305                         ctrl.value -= ctrl.value % s->qctrl[i].step;
2306                         break;
2307                 }
2308         }
2309         if (i == ARRAY_SIZE(s->qctrl))
2310                 return -EINVAL;
2311         if ((err = s->set_ctrl(cam, &ctrl)))
2312                 return err;
2313
2314         s->_qctrl[i].default_value = ctrl.value;
2315
2316         PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
2317               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
2318
2319         return 0;
2320 }
2321
2322
2323 static int
2324 sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
2325 {
2326         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
2327
2328         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2329         cc->pixelaspect.numerator = 1;
2330         cc->pixelaspect.denominator = 1;
2331
2332         if (copy_to_user(arg, cc, sizeof(*cc)))
2333                 return -EFAULT;
2334
2335         return 0;
2336 }
2337
2338
2339 static int
2340 sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
2341 {
2342         struct sn9c102_sensor* s = &cam->sensor;
2343         struct v4l2_crop crop = {
2344                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2345         };
2346
2347         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
2348
2349         if (copy_to_user(arg, &crop, sizeof(crop)))
2350                 return -EFAULT;
2351
2352         return 0;
2353 }
2354
2355
2356 static int
2357 sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
2358 {
2359         struct sn9c102_sensor* s = &cam->sensor;
2360         struct v4l2_crop crop;
2361         struct v4l2_rect* rect;
2362         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2363         struct v4l2_pix_format* pix_format = &(s->pix_format);
2364         u8 scale;
2365         const enum sn9c102_stream_state stream = cam->stream;
2366         const u32 nbuffers = cam->nbuffers;
2367         u32 i;
2368         int err = 0;
2369
2370         if (copy_from_user(&crop, arg, sizeof(crop)))
2371                 return -EFAULT;
2372
2373         rect = &(crop.c);
2374
2375         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2376                 return -EINVAL;
2377
2378         if (cam->module_param.force_munmap)
2379                 for (i = 0; i < cam->nbuffers; i++)
2380                         if (cam->frame[i].vma_use_count) {
2381                                 DBG(3, "VIDIOC_S_CROP failed. "
2382                                        "Unmap the buffers first.");
2383                                 return -EBUSY;
2384                         }
2385
2386         /* Preserve R,G or B origin */
2387         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
2388         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
2389
2390         if (rect->width < 16)
2391                 rect->width = 16;
2392         if (rect->height < 16)
2393                 rect->height = 16;
2394         if (rect->width > bounds->width)
2395                 rect->width = bounds->width;
2396         if (rect->height > bounds->height)
2397                 rect->height = bounds->height;
2398         if (rect->left < bounds->left)
2399                 rect->left = bounds->left;
2400         if (rect->top < bounds->top)
2401                 rect->top = bounds->top;
2402         if (rect->left + rect->width > bounds->left + bounds->width)
2403                 rect->left = bounds->left+bounds->width - rect->width;
2404         if (rect->top + rect->height > bounds->top + bounds->height)
2405                 rect->top = bounds->top+bounds->height - rect->height;
2406
2407         rect->width &= ~15L;
2408         rect->height &= ~15L;
2409
2410         if (SN9C102_PRESERVE_IMGSCALE) {
2411                 /* Calculate the actual scaling factor */
2412                 u32 a, b;
2413                 a = rect->width * rect->height;
2414                 b = pix_format->width * pix_format->height;
2415                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2416         } else
2417                 scale = 1;
2418
2419         if (cam->stream == STREAM_ON)
2420                 if ((err = sn9c102_stream_interrupt(cam)))
2421                         return err;
2422
2423         if (copy_to_user(arg, &crop, sizeof(crop))) {
2424                 cam->stream = stream;
2425                 return -EFAULT;
2426         }
2427
2428         if (cam->module_param.force_munmap || cam->io == IO_READ)
2429                 sn9c102_release_buffers(cam);
2430
2431         err = sn9c102_set_crop(cam, rect);
2432         if (s->set_crop)
2433                 err += s->set_crop(cam, rect);
2434         err += sn9c102_set_scale(cam, scale);
2435
2436         if (err) { /* atomic, no rollback in ioctl() */
2437                 cam->state |= DEV_MISCONFIGURED;
2438                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
2439                        "use the camera, close and open %s again.",
2440                     video_device_node_name(cam->v4ldev));
2441                 return -EIO;
2442         }
2443
2444         s->pix_format.width = rect->width/scale;
2445         s->pix_format.height = rect->height/scale;
2446         memcpy(&(s->_rect), rect, sizeof(*rect));
2447
2448         if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
2449             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2450                 cam->state |= DEV_MISCONFIGURED;
2451                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
2452                        "use the camera, close and open %s again.",
2453                     video_device_node_name(cam->v4ldev));
2454                 return -ENOMEM;
2455         }
2456
2457         if (cam->io == IO_READ)
2458                 sn9c102_empty_framequeues(cam);
2459         else if (cam->module_param.force_munmap)
2460                 sn9c102_requeue_outqueue(cam);
2461
2462         cam->stream = stream;
2463
2464         return 0;
2465 }
2466
2467
2468 static int
2469 sn9c102_vidioc_enum_framesizes(struct sn9c102_device* cam, void __user * arg)
2470 {
2471         struct v4l2_frmsizeenum frmsize;
2472
2473         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
2474                 return -EFAULT;
2475
2476         if (frmsize.index != 0)
2477                 return -EINVAL;
2478
2479         switch (cam->bridge) {
2480         case BRIDGE_SN9C101:
2481         case BRIDGE_SN9C102:
2482         case BRIDGE_SN9C103:
2483                 if (frmsize.pixel_format != V4L2_PIX_FMT_SN9C10X &&
2484                     frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
2485                         return -EINVAL;
2486         case BRIDGE_SN9C105:
2487         case BRIDGE_SN9C120:
2488                 if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG &&
2489                     frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
2490                         return -EINVAL;
2491         }
2492
2493         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
2494         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
2495         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
2496         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
2497         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
2498         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
2499
2500         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
2501                 return -EFAULT;
2502
2503         return 0;
2504 }
2505
2506
2507 static int
2508 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2509 {
2510         struct v4l2_fmtdesc fmtd;
2511
2512         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2513                 return -EFAULT;
2514
2515         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2516                 return -EINVAL;
2517
2518         if (fmtd.index == 0) {
2519                 strcpy(fmtd.description, "bayer rgb");
2520                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2521         } else if (fmtd.index == 1) {
2522                 switch (cam->bridge) {
2523                 case BRIDGE_SN9C101:
2524                 case BRIDGE_SN9C102:
2525                 case BRIDGE_SN9C103:
2526                         strcpy(fmtd.description, "compressed");
2527                         fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2528                         break;
2529                 case BRIDGE_SN9C105:
2530                 case BRIDGE_SN9C120:
2531                         strcpy(fmtd.description, "JPEG");
2532                         fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
2533                         break;
2534                 }
2535                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2536         } else
2537                 return -EINVAL;
2538
2539         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2540         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2541
2542         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2543                 return -EFAULT;
2544
2545         return 0;
2546 }
2547
2548
2549 static int
2550 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2551 {
2552         struct v4l2_format format;
2553         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
2554
2555         if (copy_from_user(&format, arg, sizeof(format)))
2556                 return -EFAULT;
2557
2558         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2559                 return -EINVAL;
2560
2561         pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_JPEG) ?
2562                            V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2563         pfmt->bytesperline = (pfmt->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2564                               pfmt->pixelformat == V4L2_PIX_FMT_JPEG)
2565                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2566         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2567         pfmt->field = V4L2_FIELD_NONE;
2568         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2569
2570         if (copy_to_user(arg, &format, sizeof(format)))
2571                 return -EFAULT;
2572
2573         return 0;
2574 }
2575
2576
2577 static int
2578 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2579                          void __user * arg)
2580 {
2581         struct sn9c102_sensor* s = &cam->sensor;
2582         struct v4l2_format format;
2583         struct v4l2_pix_format* pix;
2584         struct v4l2_pix_format* pfmt = &(s->pix_format);
2585         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2586         struct v4l2_rect rect;
2587         u8 scale;
2588         const enum sn9c102_stream_state stream = cam->stream;
2589         const u32 nbuffers = cam->nbuffers;
2590         u32 i;
2591         int err = 0;
2592
2593         if (copy_from_user(&format, arg, sizeof(format)))
2594                 return -EFAULT;
2595
2596         pix = &(format.fmt.pix);
2597
2598         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2599                 return -EINVAL;
2600
2601         memcpy(&rect, &(s->_rect), sizeof(rect));
2602
2603         { /* calculate the actual scaling factor */
2604                 u32 a, b;
2605                 a = rect.width * rect.height;
2606                 b = pix->width * pix->height;
2607                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2608         }
2609
2610         rect.width = scale * pix->width;
2611         rect.height = scale * pix->height;
2612
2613         if (rect.width < 16)
2614                 rect.width = 16;
2615         if (rect.height < 16)
2616                 rect.height = 16;
2617         if (rect.width > bounds->left + bounds->width - rect.left)
2618                 rect.width = bounds->left + bounds->width - rect.left;
2619         if (rect.height > bounds->top + bounds->height - rect.top)
2620                 rect.height = bounds->top + bounds->height - rect.top;
2621
2622         rect.width &= ~15L;
2623         rect.height &= ~15L;
2624
2625         { /* adjust the scaling factor */
2626                 u32 a, b;
2627                 a = rect.width * rect.height;
2628                 b = pix->width * pix->height;
2629                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2630         }
2631
2632         pix->width = rect.width / scale;
2633         pix->height = rect.height / scale;
2634
2635         switch (cam->bridge) {
2636         case BRIDGE_SN9C101:
2637         case BRIDGE_SN9C102:
2638         case BRIDGE_SN9C103:
2639                 if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2640                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2641                         pix->pixelformat = pfmt->pixelformat;
2642                 break;
2643         case BRIDGE_SN9C105:
2644         case BRIDGE_SN9C120:
2645                 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
2646                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2647                         pix->pixelformat = pfmt->pixelformat;
2648                 break;
2649         }
2650         pix->priv = pfmt->priv; /* bpp */
2651         pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_JPEG) ?
2652                           V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2653         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2654                              pix->pixelformat == V4L2_PIX_FMT_JPEG)
2655                             ? 0 : (pix->width * pix->priv) / 8;
2656         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2657         pix->field = V4L2_FIELD_NONE;
2658
2659         if (cmd == VIDIOC_TRY_FMT) {
2660                 if (copy_to_user(arg, &format, sizeof(format)))
2661                         return -EFAULT;
2662                 return 0;
2663         }
2664
2665         if (cam->module_param.force_munmap)
2666                 for (i = 0; i < cam->nbuffers; i++)
2667                         if (cam->frame[i].vma_use_count) {
2668                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2669                                        "buffers first.");
2670                                 return -EBUSY;
2671                         }
2672
2673         if (cam->stream == STREAM_ON)
2674                 if ((err = sn9c102_stream_interrupt(cam)))
2675                         return err;
2676
2677         if (copy_to_user(arg, &format, sizeof(format))) {
2678                 cam->stream = stream;
2679                 return -EFAULT;
2680         }
2681
2682         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2683                 sn9c102_release_buffers(cam);
2684
2685         err += sn9c102_set_pix_format(cam, pix);
2686         err += sn9c102_set_crop(cam, &rect);
2687         if (s->set_pix_format)
2688                 err += s->set_pix_format(cam, pix);
2689         if (s->set_crop)
2690                 err += s->set_crop(cam, &rect);
2691         err += sn9c102_set_scale(cam, scale);
2692
2693         if (err) { /* atomic, no rollback in ioctl() */
2694                 cam->state |= DEV_MISCONFIGURED;
2695                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2696                        "use the camera, close and open %s again.",
2697                     video_device_node_name(cam->v4ldev));
2698                 return -EIO;
2699         }
2700
2701         memcpy(pfmt, pix, sizeof(*pix));
2702         memcpy(&(s->_rect), &rect, sizeof(rect));
2703
2704         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2705             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2706                 cam->state |= DEV_MISCONFIGURED;
2707                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2708                        "use the camera, close and open %s again.",
2709                     video_device_node_name(cam->v4ldev));
2710                 return -ENOMEM;
2711         }
2712
2713         if (cam->io == IO_READ)
2714                 sn9c102_empty_framequeues(cam);
2715         else if (cam->module_param.force_munmap)
2716                 sn9c102_requeue_outqueue(cam);
2717
2718         cam->stream = stream;
2719
2720         return 0;
2721 }
2722
2723
2724 static int
2725 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2726 {
2727         if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
2728                 return -EFAULT;
2729
2730         return 0;
2731 }
2732
2733
2734 static int
2735 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2736 {
2737         struct v4l2_jpegcompression jc;
2738         const enum sn9c102_stream_state stream = cam->stream;
2739         int err = 0;
2740
2741         if (copy_from_user(&jc, arg, sizeof(jc)))
2742                 return -EFAULT;
2743
2744         if (jc.quality != 0 && jc.quality != 1)
2745                 return -EINVAL;
2746
2747         if (cam->stream == STREAM_ON)
2748                 if ((err = sn9c102_stream_interrupt(cam)))
2749                         return err;
2750
2751         err += sn9c102_set_compression(cam, &jc);
2752         if (err) { /* atomic, no rollback in ioctl() */
2753                 cam->state |= DEV_MISCONFIGURED;
2754                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware problems. "
2755                        "To use the camera, close and open %s again.",
2756                     video_device_node_name(cam->v4ldev));
2757                 return -EIO;
2758         }
2759
2760         cam->compression.quality = jc.quality;
2761
2762         cam->stream = stream;
2763
2764         return 0;
2765 }
2766
2767
2768 static int
2769 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2770 {
2771         struct v4l2_requestbuffers rb;
2772         u32 i;
2773         int err;
2774
2775         if (copy_from_user(&rb, arg, sizeof(rb)))
2776                 return -EFAULT;
2777
2778         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2779             rb.memory != V4L2_MEMORY_MMAP)
2780                 return -EINVAL;
2781
2782         if (cam->io == IO_READ) {
2783                 DBG(3, "Close and open the device again to choose the mmap "
2784                        "I/O method");
2785                 return -EBUSY;
2786         }
2787
2788         for (i = 0; i < cam->nbuffers; i++)
2789                 if (cam->frame[i].vma_use_count) {
2790                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2791                                "still mapped.");
2792                         return -EBUSY;
2793                 }
2794
2795         if (cam->stream == STREAM_ON)
2796                 if ((err = sn9c102_stream_interrupt(cam)))
2797                         return err;
2798
2799         sn9c102_empty_framequeues(cam);
2800
2801         sn9c102_release_buffers(cam);
2802         if (rb.count)
2803                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2804
2805         if (copy_to_user(arg, &rb, sizeof(rb))) {
2806                 sn9c102_release_buffers(cam);
2807                 cam->io = IO_NONE;
2808                 return -EFAULT;
2809         }
2810
2811         cam->io = rb.count ? IO_MMAP : IO_NONE;
2812
2813         return 0;
2814 }
2815
2816
2817 static int
2818 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2819 {
2820         struct v4l2_buffer b;
2821
2822         if (copy_from_user(&b, arg, sizeof(b)))
2823                 return -EFAULT;
2824
2825         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2826             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2827                 return -EINVAL;
2828
2829         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2830
2831         if (cam->frame[b.index].vma_use_count)
2832                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2833
2834         if (cam->frame[b.index].state == F_DONE)
2835                 b.flags |= V4L2_BUF_FLAG_DONE;
2836         else if (cam->frame[b.index].state != F_UNUSED)
2837                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2838
2839         if (copy_to_user(arg, &b, sizeof(b)))
2840                 return -EFAULT;
2841
2842         return 0;
2843 }
2844
2845
2846 static int
2847 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2848 {
2849         struct v4l2_buffer b;
2850         unsigned long lock_flags;
2851
2852         if (copy_from_user(&b, arg, sizeof(b)))
2853                 return -EFAULT;
2854
2855         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2856             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2857                 return -EINVAL;
2858
2859         if (cam->frame[b.index].state != F_UNUSED)
2860                 return -EINVAL;
2861
2862         cam->frame[b.index].state = F_QUEUED;
2863
2864         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2865         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2866         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2867
2868         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2869
2870         return 0;
2871 }
2872
2873
2874 static int
2875 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2876                      void __user * arg)
2877 {
2878         struct v4l2_buffer b;
2879         struct sn9c102_frame_t *f;
2880         unsigned long lock_flags;
2881         long timeout;
2882         int err = 0;
2883
2884         if (copy_from_user(&b, arg, sizeof(b)))
2885                 return -EFAULT;
2886
2887         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2888                 return -EINVAL;
2889
2890         if (list_empty(&cam->outqueue)) {
2891                 if (cam->stream == STREAM_OFF)
2892                         return -EINVAL;
2893                 if (filp->f_flags & O_NONBLOCK)
2894                         return -EAGAIN;
2895                 if (!cam->module_param.frame_timeout) {
2896                         err = wait_event_interruptible
2897                               ( cam->wait_frame,
2898                                 (!list_empty(&cam->outqueue)) ||
2899                                 (cam->state & DEV_DISCONNECTED) ||
2900                                 (cam->state & DEV_MISCONFIGURED) );
2901                         if (err)
2902                                 return err;
2903                 } else {
2904                         timeout = wait_event_interruptible_timeout
2905                                   ( cam->wait_frame,
2906                                     (!list_empty(&cam->outqueue)) ||
2907                                     (cam->state & DEV_DISCONNECTED) ||
2908                                     (cam->state & DEV_MISCONFIGURED),
2909                                     cam->module_param.frame_timeout *
2910                                     1000 * msecs_to_jiffies(1) );
2911                         if (timeout < 0)
2912                                 return timeout;
2913                         else if (timeout == 0 &&
2914                                  !(cam->state & DEV_DISCONNECTED)) {
2915                                 DBG(1, "Video frame timeout elapsed");
2916                                 return -EIO;
2917                         }
2918                 }
2919                 if (cam->state & DEV_DISCONNECTED)
2920                         return -ENODEV;
2921                 if (cam->state & DEV_MISCONFIGURED)
2922                         return -EIO;
2923         }
2924
2925         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2926         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2927         list_del(cam->outqueue.next);
2928         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2929
2930         f->state = F_UNUSED;
2931
2932         memcpy(&b, &f->buf, sizeof(b));
2933         if (f->vma_use_count)
2934                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2935
2936         if (copy_to_user(arg, &b, sizeof(b)))
2937                 return -EFAULT;
2938
2939         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2940
2941         return 0;
2942 }
2943
2944
2945 static int
2946 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2947 {
2948         int type;
2949
2950         if (copy_from_user(&type, arg, sizeof(type)))
2951                 return -EFAULT;
2952
2953         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2954                 return -EINVAL;
2955
2956         cam->stream = STREAM_ON;
2957
2958         DBG(3, "Stream on");
2959
2960         return 0;
2961 }
2962
2963
2964 static int
2965 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2966 {
2967         int type, err;
2968
2969         if (copy_from_user(&type, arg, sizeof(type)))
2970                 return -EFAULT;
2971
2972         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2973                 return -EINVAL;
2974
2975         if (cam->stream == STREAM_ON)
2976                 if ((err = sn9c102_stream_interrupt(cam)))
2977                         return err;
2978
2979         sn9c102_empty_framequeues(cam);
2980
2981         DBG(3, "Stream off");
2982
2983         return 0;
2984 }
2985
2986
2987 static int
2988 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2989 {
2990         struct v4l2_streamparm sp;
2991
2992         if (copy_from_user(&sp, arg, sizeof(sp)))
2993                 return -EFAULT;
2994
2995         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2996                 return -EINVAL;
2997
2998         sp.parm.capture.extendedmode = 0;
2999         sp.parm.capture.readbuffers = cam->nreadbuffers;
3000
3001         if (copy_to_user(arg, &sp, sizeof(sp)))
3002                 return -EFAULT;
3003
3004         return 0;
3005 }
3006
3007
3008 static int
3009 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
3010 {
3011         struct v4l2_streamparm sp;
3012
3013         if (copy_from_user(&sp, arg, sizeof(sp)))
3014                 return -EFAULT;
3015
3016         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
3017                 return -EINVAL;
3018
3019         sp.parm.capture.extendedmode = 0;
3020
3021         if (sp.parm.capture.readbuffers == 0)
3022                 sp.parm.capture.readbuffers = cam->nreadbuffers;
3023
3024         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
3025                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
3026
3027         if (copy_to_user(arg, &sp, sizeof(sp)))
3028                 return -EFAULT;
3029
3030         cam->nreadbuffers = sp.parm.capture.readbuffers;
3031
3032         return 0;
3033 }
3034
3035
3036 static int
3037 sn9c102_vidioc_enumaudio(struct sn9c102_device* cam, void __user * arg)
3038 {
3039         struct v4l2_audio audio;
3040
3041         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3042                 return -EINVAL;
3043
3044         if (copy_from_user(&audio, arg, sizeof(audio)))
3045                 return -EFAULT;
3046
3047         if (audio.index != 0)
3048                 return -EINVAL;
3049
3050         strcpy(audio.name, "Microphone");
3051         audio.capability = 0;
3052         audio.mode = 0;
3053
3054         if (copy_to_user(arg, &audio, sizeof(audio)))
3055                 return -EFAULT;
3056
3057         return 0;
3058 }
3059
3060
3061 static int
3062 sn9c102_vidioc_g_audio(struct sn9c102_device* cam, void __user * arg)
3063 {
3064         struct v4l2_audio audio;
3065
3066         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3067                 return -EINVAL;
3068
3069         if (copy_from_user(&audio, arg, sizeof(audio)))
3070                 return -EFAULT;
3071
3072         memset(&audio, 0, sizeof(audio));
3073         strcpy(audio.name, "Microphone");
3074
3075         if (copy_to_user(arg, &audio, sizeof(audio)))
3076                 return -EFAULT;
3077
3078         return 0;
3079 }
3080
3081
3082 static int
3083 sn9c102_vidioc_s_audio(struct sn9c102_device* cam, void __user * arg)
3084 {
3085         struct v4l2_audio audio;
3086
3087         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3088                 return -EINVAL;
3089
3090         if (copy_from_user(&audio, arg, sizeof(audio)))
3091                 return -EFAULT;
3092
3093         if (audio.index != 0)
3094                 return -EINVAL;
3095
3096         return 0;
3097 }
3098
3099
3100 static long sn9c102_ioctl_v4l2(struct file *filp,
3101                               unsigned int cmd, void __user *arg)
3102 {
3103         struct sn9c102_device *cam = video_drvdata(filp);
3104
3105         switch (cmd) {
3106
3107         case VIDIOC_QUERYCAP:
3108                 return sn9c102_vidioc_querycap(cam, arg);
3109
3110         case VIDIOC_ENUMINPUT:
3111                 return sn9c102_vidioc_enuminput(cam, arg);
3112
3113         case VIDIOC_G_INPUT:
3114                 return sn9c102_vidioc_g_input(cam, arg);
3115
3116         case VIDIOC_S_INPUT:
3117                 return sn9c102_vidioc_s_input(cam, arg);
3118
3119         case VIDIOC_QUERYCTRL:
3120                 return sn9c102_vidioc_query_ctrl(cam, arg);
3121
3122         case VIDIOC_G_CTRL:
3123                 return sn9c102_vidioc_g_ctrl(cam, arg);
3124
3125         case VIDIOC_S_CTRL:
3126                 return sn9c102_vidioc_s_ctrl(cam, arg);
3127
3128         case VIDIOC_CROPCAP:
3129                 return sn9c102_vidioc_cropcap(cam, arg);
3130
3131         case VIDIOC_G_CROP:
3132                 return sn9c102_vidioc_g_crop(cam, arg);
3133
3134         case VIDIOC_S_CROP:
3135                 return sn9c102_vidioc_s_crop(cam, arg);
3136
3137         case VIDIOC_ENUM_FRAMESIZES:
3138                 return sn9c102_vidioc_enum_framesizes(cam, arg);
3139
3140         case VIDIOC_ENUM_FMT:
3141                 return sn9c102_vidioc_enum_fmt(cam, arg);
3142
3143         case VIDIOC_G_FMT:
3144                 return sn9c102_vidioc_g_fmt(cam, arg);
3145
3146         case VIDIOC_TRY_FMT:
3147         case VIDIOC_S_FMT:
3148                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
3149
3150         case VIDIOC_G_JPEGCOMP:
3151                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
3152
3153         case VIDIOC_S_JPEGCOMP:
3154                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
3155
3156         case VIDIOC_REQBUFS:
3157                 return sn9c102_vidioc_reqbufs(cam, arg);
3158
3159         case VIDIOC_QUERYBUF:
3160                 return sn9c102_vidioc_querybuf(cam, arg);
3161
3162         case VIDIOC_QBUF:
3163                 return sn9c102_vidioc_qbuf(cam, arg);
3164
3165         case VIDIOC_DQBUF:
3166                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
3167
3168         case VIDIOC_STREAMON:
3169                 return sn9c102_vidioc_streamon(cam, arg);
3170
3171         case VIDIOC_STREAMOFF:
3172                 return sn9c102_vidioc_streamoff(cam, arg);
3173
3174         case VIDIOC_G_PARM:
3175                 return sn9c102_vidioc_g_parm(cam, arg);
3176
3177         case VIDIOC_S_PARM:
3178                 return sn9c102_vidioc_s_parm(cam, arg);
3179
3180         case VIDIOC_ENUMAUDIO:
3181                 return sn9c102_vidioc_enumaudio(cam, arg);
3182
3183         case VIDIOC_G_AUDIO:
3184                 return sn9c102_vidioc_g_audio(cam, arg);
3185
3186         case VIDIOC_S_AUDIO:
3187                 return sn9c102_vidioc_s_audio(cam, arg);
3188
3189         case VIDIOC_G_STD:
3190         case VIDIOC_S_STD:
3191         case VIDIOC_QUERYSTD:
3192         case VIDIOC_ENUMSTD:
3193         case VIDIOC_QUERYMENU:
3194         case VIDIOC_ENUM_FRAMEINTERVALS:
3195                 return -EINVAL;
3196
3197         default:
3198                 return -EINVAL;
3199
3200         }
3201 }
3202
3203
3204 static long sn9c102_ioctl(struct file *filp,
3205                          unsigned int cmd, unsigned long arg)
3206 {
3207         struct sn9c102_device *cam = video_drvdata(filp);
3208         int err = 0;
3209
3210         if (mutex_lock_interruptible(&cam->fileop_mutex))
3211                 return -ERESTARTSYS;
3212
3213         if (cam->state & DEV_DISCONNECTED) {
3214                 DBG(1, "Device not present");
3215                 mutex_unlock(&cam->fileop_mutex);
3216                 return -ENODEV;
3217         }
3218
3219         if (cam->state & DEV_MISCONFIGURED) {
3220                 DBG(1, "The camera is misconfigured. Close and open it "
3221                        "again.");
3222                 mutex_unlock(&cam->fileop_mutex);
3223                 return -EIO;
3224         }
3225
3226         V4LDBG(3, "sn9c102", cmd);
3227
3228         err = sn9c102_ioctl_v4l2(filp, cmd, (void __user *)arg);
3229
3230         mutex_unlock(&cam->fileop_mutex);
3231
3232         return err;
3233 }
3234
3235 /*****************************************************************************/
3236
3237 static const struct v4l2_file_operations sn9c102_fops = {
3238         .owner = THIS_MODULE,
3239         .open = sn9c102_open,
3240         .release = sn9c102_release,
3241         .ioctl = sn9c102_ioctl,
3242         .read = sn9c102_read,
3243         .poll = sn9c102_poll,
3244         .mmap = sn9c102_mmap,
3245 };
3246
3247 /*****************************************************************************/
3248
3249 /* It exists a single interface only. We do not need to validate anything. */
3250 static int
3251 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
3252 {
3253         struct usb_device *udev = interface_to_usbdev(intf);
3254         struct sn9c102_device* cam;
3255         static unsigned int dev_nr;
3256         unsigned int i;
3257         int err = 0, r;
3258
3259         if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
3260                 return -ENOMEM;
3261
3262         cam->usbdev = udev;
3263
3264         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
3265                 DBG(1, "kzalloc() failed");
3266                 err = -ENOMEM;
3267                 goto fail;
3268         }
3269
3270         if (!(cam->v4ldev = video_device_alloc())) {
3271                 DBG(1, "video_device_alloc() failed");
3272                 err = -ENOMEM;
3273                 goto fail;
3274         }
3275
3276         r = sn9c102_read_reg(cam, 0x00);
3277         if (r < 0 || (r != 0x10 && r != 0x11 && r != 0x12)) {
3278                 DBG(1, "Sorry, this is not a SN9C1xx-based camera "
3279                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3280                 err = -ENODEV;
3281                 goto fail;
3282         }
3283
3284         cam->bridge = id->driver_info;
3285         switch (cam->bridge) {
3286         case BRIDGE_SN9C101:
3287         case BRIDGE_SN9C102:
3288                 DBG(2, "SN9C10[12] PC Camera Controller detected "
3289                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3290                 break;
3291         case BRIDGE_SN9C103:
3292                 DBG(2, "SN9C103 PC Camera Controller detected "
3293                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3294                 break;
3295         case BRIDGE_SN9C105:
3296                 DBG(2, "SN9C105 PC Camera Controller detected "
3297                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3298                 break;
3299         case BRIDGE_SN9C120:
3300                 DBG(2, "SN9C120 PC Camera Controller detected "
3301                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3302                 break;
3303         }
3304
3305         for  (i = 0; i < ARRAY_SIZE(sn9c102_sensor_table); i++) {
3306                 err = sn9c102_sensor_table[i](cam);
3307                 if (!err)
3308                         break;
3309         }
3310
3311         if (!err) {
3312                 DBG(2, "%s image sensor detected", cam->sensor.name);
3313                 DBG(3, "Support for %s maintained by %s",
3314                     cam->sensor.name, cam->sensor.maintainer);
3315         } else {
3316                 DBG(1, "No supported image sensor detected for this bridge");
3317                 err = -ENODEV;
3318                 goto fail;
3319         }
3320
3321         if (!(cam->bridge & cam->sensor.supported_bridge)) {
3322                 DBG(1, "Bridge not supported");
3323                 err = -ENODEV;
3324                 goto fail;
3325         }
3326
3327         if (sn9c102_init(cam)) {
3328                 DBG(1, "Initialization failed. I will retry on open().");
3329                 cam->state |= DEV_MISCONFIGURED;
3330         }
3331
3332         strcpy(cam->v4ldev->name, "SN9C1xx PC Camera");
3333         cam->v4ldev->fops = &sn9c102_fops;
3334         cam->v4ldev->release = video_device_release;
3335         cam->v4ldev->parent = &udev->dev;
3336
3337         init_completion(&cam->probe);
3338
3339         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
3340                                     video_nr[dev_nr]);
3341         if (err) {
3342                 DBG(1, "V4L2 device registration failed");
3343                 if (err == -ENFILE && video_nr[dev_nr] == -1)
3344                         DBG(1, "Free /dev/videoX node not found");
3345                 video_nr[dev_nr] = -1;
3346                 dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3347                 complete_all(&cam->probe);
3348                 goto fail;
3349         }
3350
3351         DBG(2, "V4L2 device registered as %s",
3352             video_device_node_name(cam->v4ldev));
3353
3354         video_set_drvdata(cam->v4ldev, cam);
3355         cam->module_param.force_munmap = force_munmap[dev_nr];
3356         cam->module_param.frame_timeout = frame_timeout[dev_nr];
3357
3358         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3359
3360 #ifdef CONFIG_VIDEO_ADV_DEBUG
3361         err = sn9c102_create_sysfs(cam);
3362         if (!err)
3363                 DBG(2, "Optional device control through 'sysfs' "
3364                        "interface ready");
3365         else
3366                 DBG(2, "Failed to create optional 'sysfs' interface for "
3367                        "device controlling. Error #%d", err);
3368 #else
3369         DBG(2, "Optional device control through 'sysfs' interface disabled");
3370         DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
3371                "configuration option to enable it.");
3372 #endif
3373
3374         usb_set_intfdata(intf, cam);
3375         kref_init(&cam->kref);
3376         usb_get_dev(cam->usbdev);
3377
3378         complete_all(&cam->probe);
3379
3380         return 0;
3381
3382 fail:
3383         if (cam) {
3384                 kfree(cam->control_buffer);
3385                 if (cam->v4ldev)
3386                         video_device_release(cam->v4ldev);
3387                 kfree(cam);
3388         }
3389         return err;
3390 }
3391
3392
3393 static void sn9c102_usb_disconnect(struct usb_interface* intf)
3394 {
3395         struct sn9c102_device* cam;
3396
3397         down_write(&sn9c102_dev_lock);
3398
3399         cam = usb_get_intfdata(intf);
3400
3401         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
3402
3403         if (cam->users) {
3404                 DBG(2, "Device %s is open! Deregistration and memory "
3405                        "deallocation are deferred.",
3406                     video_device_node_name(cam->v4ldev));
3407                 cam->state |= DEV_MISCONFIGURED;
3408                 sn9c102_stop_transfer(cam);
3409                 cam->state |= DEV_DISCONNECTED;
3410                 wake_up_interruptible(&cam->wait_frame);
3411                 wake_up(&cam->wait_stream);
3412         } else
3413                 cam->state |= DEV_DISCONNECTED;
3414
3415         wake_up_interruptible_all(&cam->wait_open);
3416
3417         kref_put(&cam->kref, sn9c102_release_resources);
3418
3419         up_write(&sn9c102_dev_lock);
3420 }
3421
3422
3423 static struct usb_driver sn9c102_usb_driver = {
3424         .name =       "sn9c102",
3425         .id_table =   sn9c102_id_table,
3426         .probe =      sn9c102_usb_probe,
3427         .disconnect = sn9c102_usb_disconnect,
3428 };
3429
3430 /*****************************************************************************/
3431
3432 static int __init sn9c102_module_init(void)
3433 {
3434         int err = 0;
3435
3436         KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
3437         KDBG(3, SN9C102_MODULE_AUTHOR);
3438
3439         if ((err = usb_register(&sn9c102_usb_driver)))
3440                 KDBG(1, "usb_register() failed");
3441
3442         return err;
3443 }
3444
3445
3446 static void __exit sn9c102_module_exit(void)
3447 {
3448         usb_deregister(&sn9c102_usb_driver);
3449 }
3450
3451
3452 module_init(sn9c102_module_init);
3453 module_exit(sn9c102_module_exit);