drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #define GSPCA_VERSION   "2.14.0"
  27
  28 #include <linux/init.h>
  29 #include <linux/fs.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/string.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/io.h>
  37 #include <asm/page.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/ktime.h>
  40 #include <media/v4l2-ioctl.h>
  41 #include <media/v4l2-ctrls.h>
  42
  43 #include "gspca.h"
  44
  45 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  46 #include <linux/input.h>
  47 #include <linux/usb/input.h>
  48 #endif
  49
  50 /* global values */
  51 #define DEF_NURBS 3             /* default number of URBs */
  52 #if DEF_NURBS > MAX_NURBS
  53 #error "DEF_NURBS too big"
  54 #endif
  55
  56 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  57 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  58 MODULE_LICENSE("GPL");
  59 MODULE_VERSION(GSPCA_VERSION);
  60
  61 #ifdef GSPCA_DEBUG
  62 int gspca_debug = D_ERR | D_PROBE;
  63 EXPORT_SYMBOL(gspca_debug);
  64
  65 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  66 {
  67         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  68                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  69                         txt,
  70                         pixfmt & 0xff,
  71                         (pixfmt >> 8) & 0xff,
  72                         (pixfmt >> 16) & 0xff,
  73                         pixfmt >> 24,
  74                         w, h);
  75         } else {
  76                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  77                         txt,
  78                         pixfmt,
  79                         w, h);
  80         }
  81 }
  82 #else
  83 #define PDEBUG_MODE(txt, pixfmt, w, h)
  84 #endif
  85
  86 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  87 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  88 #define GSPCA_MEMORY_READ 7
  89
  90 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  91
  92 /*
  93  * VMA operations.
  94  */
  95 static void gspca_vm_open(struct vm_area_struct *vma)
  96 {
  97         struct gspca_frame *frame = vma->vm_private_data;
  98
  99         frame->vma_use_count++;
 100         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 101 }
 102
 103 static void gspca_vm_close(struct vm_area_struct *vma)
 104 {
 105         struct gspca_frame *frame = vma->vm_private_data;
 106
 107         if (--frame->vma_use_count <= 0)
 108                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 109 }
 110
 111 static const struct vm_operations_struct gspca_vm_ops = {
 112         .open           = gspca_vm_open,
 113         .close          = gspca_vm_close,
 114 };
 115
 116 /*
 117  * Input and interrupt endpoint handling functions
 118  */
 119 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 120 static void int_irq(struct urb *urb)
 121 {
 122         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 123         int ret;
 124
 125         ret = urb->status;
 126         switch (ret) {
 127         case 0:
 128                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 129                     urb->transfer_buffer, urb->actual_length) < 0) {
 130                         PDEBUG(D_ERR, "Unknown packet received");
 131                 }
 132                 break;
 133
 134         case -ENOENT:
 135         case -ECONNRESET:
 136         case -ENODEV:
 137         case -ESHUTDOWN:
 138                 /* Stop is requested either by software or hardware is gone,
 139                  * keep the ret value non-zero and don't resubmit later.
 140                  */
 141                 break;
 142
 143         default:
 144                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 145                 urb->status = 0;
 146                 ret = 0;
 147         }
 148
 149         if (ret == 0) {
 150                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 151                 if (ret < 0)
 152                         pr_err("Resubmit URB failed with error %i\n", ret);
 153         }
 154 }
 155
 156 static int gspca_input_connect(struct gspca_dev *dev)
 157 {
 158         struct input_dev *input_dev;
 159         int err = 0;
 160
 161         dev->input_dev = NULL;
 162         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 163                 input_dev = input_allocate_device();
 164                 if (!input_dev)
 165                         return -ENOMEM;
 166
 167                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 168                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 169
 170                 input_dev->name = dev->sd_desc->name;
 171                 input_dev->phys = dev->phys;
 172
 173                 usb_to_input_id(dev->dev, &input_dev->id);
 174
 175                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 176                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 177                 input_dev->dev.parent = &dev->dev->dev;
 178
 179                 err = input_register_device(input_dev);
 180                 if (err) {
 181                         pr_err("Input device registration failed with error %i\n",
 182                                err);
 183                         input_dev->dev.parent = NULL;
 184                         input_free_device(input_dev);
 185                 } else {
 186                         dev->input_dev = input_dev;
 187                 }
 188         }
 189
 190         return err;
 191 }
 192
 193 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 194                           struct usb_endpoint_descriptor *ep)
 195 {
 196         unsigned int buffer_len;
 197         int interval;
 198         struct urb *urb;
 199         struct usb_device *dev;
 200         void *buffer = NULL;
 201         int ret = -EINVAL;
 202
 203         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 204         interval = ep->bInterval;
 205         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 206                 "buffer_len=%u, interval=%u",
 207                 ep->bEndpointAddress, buffer_len, interval);
 208
 209         dev = gspca_dev->dev;
 210
 211         urb = usb_alloc_urb(0, GFP_KERNEL);
 212         if (!urb) {
 213                 ret = -ENOMEM;
 214                 goto error;
 215         }
 216
 217         buffer = usb_alloc_coherent(dev, buffer_len,
 218                                 GFP_KERNEL, &urb->transfer_dma);
 219         if (!buffer) {
 220                 ret = -ENOMEM;
 221                 goto error_buffer;
 222         }
 223         usb_fill_int_urb(urb, dev,
 224                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 225                 buffer, buffer_len,
 226                 int_irq, (void *)gspca_dev, interval);
 227         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 228         ret = usb_submit_urb(urb, GFP_KERNEL);
 229         if (ret < 0) {
 230                 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
 231                 goto error_submit;
 232         }
 233         gspca_dev->int_urb = urb;
 234         return ret;
 235
 236 error_submit:
 237         usb_free_coherent(dev,
 238                           urb->transfer_buffer_length,
 239                           urb->transfer_buffer,
 240                           urb->transfer_dma);
 241 error_buffer:
 242         usb_free_urb(urb);
 243 error:
 244         return ret;
 245 }
 246
 247 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 248 {
 249         struct usb_interface *intf;
 250         struct usb_host_interface *intf_desc;
 251         struct usb_endpoint_descriptor *ep;
 252         int i;
 253
 254         if (gspca_dev->sd_desc->int_pkt_scan)  {
 255                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 256                 intf_desc = intf->cur_altsetting;
 257                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 258                         ep = &intf_desc->endpoint[i].desc;
 259                         if (usb_endpoint_dir_in(ep) &&
 260                             usb_endpoint_xfer_int(ep)) {
 261
 262                                 alloc_and_submit_int_urb(gspca_dev, ep);
 263                                 break;
 264                         }
 265                 }
 266         }
 267 }
 268
 269 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 270 {
 271         struct urb *urb;
 272
 273         urb = gspca_dev->int_urb;
 274         if (urb) {
 275                 gspca_dev->int_urb = NULL;
 276                 usb_kill_urb(urb);
 277                 usb_free_coherent(gspca_dev->dev,
 278                                   urb->transfer_buffer_length,
 279                                   urb->transfer_buffer,
 280                                   urb->transfer_dma);
 281                 usb_free_urb(urb);
 282         }
 283 }
 284 #else
 285 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 286 {
 287 }
 288
 289 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 290 {
 291 }
 292
 293 static inline int gspca_input_connect(struct gspca_dev *dev)
 294 {
 295         return 0;
 296 }
 297 #endif
 298
 299 /*
 300  * fill a video frame from an URB and resubmit
 301  */
 302 static void fill_frame(struct gspca_dev *gspca_dev,
 303                         struct urb *urb)
 304 {
 305         u8 *data;               /* address of data in the iso message */
 306         int i, len, st;
 307         cam_pkt_op pkt_scan;
 308
 309         if (urb->status != 0) {
 310                 if (urb->status == -ESHUTDOWN)
 311                         return;         /* disconnection */
 312 #ifdef CONFIG_PM
 313                 if (gspca_dev->frozen)
 314                         return;
 315 #endif
 316                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 317                 urb->status = 0;
 318                 goto resubmit;
 319         }
 320         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 321         for (i = 0; i < urb->number_of_packets; i++) {
 322                 len = urb->iso_frame_desc[i].actual_length;
 323
 324                 /* check the packet status and length */
 325                 st = urb->iso_frame_desc[i].status;
 326                 if (st) {
 327                         pr_err("ISOC data error: [%d] len=%d, status=%d\n",
 328                                i, len, st);
 329                         gspca_dev->last_packet_type = DISCARD_PACKET;
 330                         continue;
 331                 }
 332                 if (len == 0) {
 333                         if (gspca_dev->empty_packet == 0)
 334                                 gspca_dev->empty_packet = 1;
 335                         continue;
 336                 }
 337
 338                 /* let the packet be analyzed by the subdriver */
 339                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 340                         i, urb->iso_frame_desc[i].offset, len);
 341                 data = (u8 *) urb->transfer_buffer
 342                                         + urb->iso_frame_desc[i].offset;
 343                 pkt_scan(gspca_dev, data, len);
 344         }
 345
 346 resubmit:
 347         /* resubmit the URB */
 348         st = usb_submit_urb(urb, GFP_ATOMIC);
 349         if (st < 0)
 350                 pr_err("usb_submit_urb() ret %d\n", st);
 351 }
 352
 353 /*
 354  * ISOC message interrupt from the USB device
 355  *
 356  * Analyse each packet and call the subdriver for copy to the frame buffer.
 357  */
 358 static void isoc_irq(struct urb *urb)
 359 {
 360         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 361
 362         PDEBUG(D_PACK, "isoc irq");
 363         if (!gspca_dev->streaming)
 364                 return;
 365         fill_frame(gspca_dev, urb);
 366 }
 367
 368 /*
 369  * bulk message interrupt from the USB device
 370  */
 371 static void bulk_irq(struct urb *urb)
 372 {
 373         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 374         int st;
 375
 376         PDEBUG(D_PACK, "bulk irq");
 377         if (!gspca_dev->streaming)
 378                 return;
 379         switch (urb->status) {
 380         case 0:
 381                 break;
 382         case -ESHUTDOWN:
 383                 return;         /* disconnection */
 384         default:
 385 #ifdef CONFIG_PM
 386                 if (gspca_dev->frozen)
 387                         return;
 388 #endif
 389                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 390                 urb->status = 0;
 391                 goto resubmit;
 392         }
 393
 394         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 395         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 396                                 urb->transfer_buffer,
 397                                 urb->actual_length);
 398
 399 resubmit:
 400         /* resubmit the URB */
 401         if (gspca_dev->cam.bulk_nurbs != 0) {
 402                 st = usb_submit_urb(urb, GFP_ATOMIC);
 403                 if (st < 0)
 404                         pr_err("usb_submit_urb() ret %d\n", st);
 405         }
 406 }
 407
 408 /*
 409  * add data to the current frame
 410  *
 411  * This function is called by the subdrivers at interrupt level.
 412  *
 413  * To build a frame, these ones must add
 414  *      - one FIRST_PACKET
 415  *      - 0 or many INTER_PACKETs
 416  *      - one LAST_PACKET
 417  * DISCARD_PACKET invalidates the whole frame.
 418  */
 419 void gspca_frame_add(struct gspca_dev *gspca_dev,
 420                         enum gspca_packet_type packet_type,
 421                         const u8 *data,
 422                         int len)
 423 {
 424         struct gspca_frame *frame;
 425         int i, j;
 426
 427         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 428
 429         if (packet_type == FIRST_PACKET) {
 430                 i = atomic_read(&gspca_dev->fr_i);
 431
 432                 /* if there are no queued buffer, discard the whole frame */
 433                 if (i == atomic_read(&gspca_dev->fr_q)) {
 434                         gspca_dev->last_packet_type = DISCARD_PACKET;
 435                         gspca_dev->sequence++;
 436                         return;
 437                 }
 438                 j = gspca_dev->fr_queue[i];
 439                 frame = &gspca_dev->frame[j];
 440                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 441                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 442                 gspca_dev->image = frame->data;
 443                 gspca_dev->image_len = 0;
 444         } else {
 445                 switch (gspca_dev->last_packet_type) {
 446                 case DISCARD_PACKET:
 447                         if (packet_type == LAST_PACKET) {
 448                                 gspca_dev->last_packet_type = packet_type;
 449                                 gspca_dev->image = NULL;
 450                                 gspca_dev->image_len = 0;
 451                         }
 452                         return;
 453                 case LAST_PACKET:
 454                         return;
 455                 }
 456         }
 457
 458         /* append the packet to the frame buffer */
 459         if (len > 0) {
 460                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 461                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 462                                 gspca_dev->image_len + len,
 463                                 gspca_dev->frsz);
 464                         packet_type = DISCARD_PACKET;
 465                 } else {
 466 /* !! image is NULL only when last pkt is LAST or DISCARD
 467                         if (gspca_dev->image == NULL) {
 468                                 pr_err("gspca_frame_add() image == NULL\n");
 469                                 return;
 470                         }
 471  */
 472                         memcpy(gspca_dev->image + gspca_dev->image_len,
 473                                 data, len);
 474                         gspca_dev->image_len += len;
 475                 }
 476         }
 477         gspca_dev->last_packet_type = packet_type;
 478
 479         /* if last packet, invalidate packet concatenation until
 480          * next first packet, wake up the application and advance
 481          * in the queue */
 482         if (packet_type == LAST_PACKET) {
 483                 i = atomic_read(&gspca_dev->fr_i);
 484                 j = gspca_dev->fr_queue[i];
 485                 frame = &gspca_dev->frame[j];
 486                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 487                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 488                                          | V4L2_BUF_FLAG_DONE)
 489                                         & ~V4L2_BUF_FLAG_QUEUED;
 490                 i = (i + 1) % GSPCA_MAX_FRAMES;
 491                 atomic_set(&gspca_dev->fr_i, i);
 492                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 493                 PDEBUG(D_FRAM, "frame complete len:%d",
 494                         frame->v4l2_buf.bytesused);
 495                 gspca_dev->image = NULL;
 496                 gspca_dev->image_len = 0;
 497         }
 498 }
 499 EXPORT_SYMBOL(gspca_frame_add);
 500
 501 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 502                         enum v4l2_memory memory, unsigned int count)
 503 {
 504         struct gspca_frame *frame;
 505         unsigned int frsz;
 506         int i;
 507
 508         i = gspca_dev->curr_mode;
 509         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 510         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 511         frsz = PAGE_ALIGN(frsz);
 512         if (count >= GSPCA_MAX_FRAMES)
 513                 count = GSPCA_MAX_FRAMES - 1;
 514         gspca_dev->frbuf = vmalloc_32(frsz * count);
 515         if (!gspca_dev->frbuf) {
 516                 pr_err("frame alloc failed\n");
 517                 return -ENOMEM;
 518         }
 519         gspca_dev->capt_file = file;
 520         gspca_dev->memory = memory;
 521         gspca_dev->frsz = frsz;
 522         gspca_dev->nframes = count;
 523         for (i = 0; i < count; i++) {
 524                 frame = &gspca_dev->frame[i];
 525                 frame->v4l2_buf.index = i;
 526                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 527                 frame->v4l2_buf.flags = 0;
 528                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 529                 frame->v4l2_buf.length = frsz;
 530                 frame->v4l2_buf.memory = memory;
 531                 frame->v4l2_buf.sequence = 0;
 532                 frame->data = gspca_dev->frbuf + i * frsz;
 533                 frame->v4l2_buf.m.offset = i * frsz;
 534         }
 535         atomic_set(&gspca_dev->fr_q, 0);
 536         atomic_set(&gspca_dev->fr_i, 0);
 537         gspca_dev->fr_o = 0;
 538         return 0;
 539 }
 540
 541 static void frame_free(struct gspca_dev *gspca_dev)
 542 {
 543         int i;
 544
 545         PDEBUG(D_STREAM, "frame free");
 546         if (gspca_dev->frbuf != NULL) {
 547                 vfree(gspca_dev->frbuf);
 548                 gspca_dev->frbuf = NULL;
 549                 for (i = 0; i < gspca_dev->nframes; i++)
 550                         gspca_dev->frame[i].data = NULL;
 551         }
 552         gspca_dev->nframes = 0;
 553         gspca_dev->frsz = 0;
 554         gspca_dev->capt_file = NULL;
 555         gspca_dev->memory = GSPCA_MEMORY_NO;
 556 }
 557
 558 static void destroy_urbs(struct gspca_dev *gspca_dev)
 559 {
 560         struct urb *urb;
 561         unsigned int i;
 562
 563         PDEBUG(D_STREAM, "kill transfer");
 564         for (i = 0; i < MAX_NURBS; i++) {
 565                 urb = gspca_dev->urb[i];
 566                 if (urb == NULL)
 567                         break;
 568
 569                 gspca_dev->urb[i] = NULL;
 570                 usb_kill_urb(urb);
 571                 if (urb->transfer_buffer != NULL)
 572                         usb_free_coherent(gspca_dev->dev,
 573                                           urb->transfer_buffer_length,
 574                                           urb->transfer_buffer,
 575                                           urb->transfer_dma);
 576                 usb_free_urb(urb);
 577         }
 578 }
 579
 580 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 581 {
 582         int ret;
 583
 584         if (gspca_dev->alt == 0)
 585                 return 0;
 586         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 587         if (ret < 0)
 588                 pr_err("set alt 0 err %d\n", ret);
 589         return ret;
 590 }
 591
 592 /* Note: both the queue and the usb locks should be held when calling this */
 593 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 594 {
 595         gspca_dev->streaming = 0;
 596         if (gspca_dev->present) {
 597                 if (gspca_dev->sd_desc->stopN)
 598                         gspca_dev->sd_desc->stopN(gspca_dev);
 599                 destroy_urbs(gspca_dev);
 600                 gspca_input_destroy_urb(gspca_dev);
 601                 gspca_set_alt0(gspca_dev);
 602                 gspca_input_create_urb(gspca_dev);
 603         }
 604
 605         /* always call stop0 to free the subdriver's resources */
 606         if (gspca_dev->sd_desc->stop0)
 607                 gspca_dev->sd_desc->stop0(gspca_dev);
 608         PDEBUG(D_STREAM, "stream off OK");
 609 }
 610
 611 /*
 612  * look for an input transfer endpoint in an alternate setting
 613  */
 614 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 615                                           int xfer)
 616 {
 617         struct usb_host_endpoint *ep;
 618         int i, attr;
 619
 620         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 621                 ep = &alt->endpoint[i];
 622                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 623                 if (attr == xfer
 624                     && ep->desc.wMaxPacketSize != 0
 625                     && usb_endpoint_dir_in(&ep->desc))
 626                         return ep;
 627         }
 628         return NULL;
 629 }
 630
 631 /* compute the minimum bandwidth for the current transfer */
 632 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 633 {
 634         u32 bandwidth;
 635         int i;
 636
 637         /* get the (max) image size */
 638         i = gspca_dev->curr_mode;
 639         bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
 640
 641         /* if the image is compressed, estimate its mean size */
 642         if (!gspca_dev->cam.needs_full_bandwidth &&
 643             bandwidth < gspca_dev->cam.cam_mode[i].width *
 644                                 gspca_dev->cam.cam_mode[i].height)
 645                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 646
 647         /* estimate the frame rate */
 648         if (gspca_dev->sd_desc->get_streamparm) {
 649                 struct v4l2_streamparm parm;
 650
 651                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 652                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 653                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 654         } else {
 655
 656                 /* don't hope more than 15 fps with USB 1.1 and
 657                  * image resolution >= 640x480 */
 658                 if (gspca_dev->width >= 640
 659                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 660                         bandwidth *= 15;                /* 15 fps */
 661                 else
 662                         bandwidth *= 30;                /* 30 fps */
 663         }
 664
 665         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 666         return bandwidth;
 667 }
 668
 669 /* endpoint table */
 670 #define MAX_ALT 16
 671 struct ep_tb_s {
 672         u32 alt;
 673         u32 bandwidth;
 674 };
 675
 676 /*
 677  * build the table of the endpoints
 678  * and compute the minimum bandwidth for the image transfer
 679  */
 680 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 681                         struct usb_interface *intf,
 682                         struct ep_tb_s *ep_tb)
 683 {
 684         struct usb_host_endpoint *ep;
 685         int i, j, nbalt, psize, found;
 686         u32 bandwidth, last_bw;
 687
 688         nbalt = intf->num_altsetting;
 689         if (nbalt > MAX_ALT)
 690                 nbalt = MAX_ALT;        /* fixme: should warn */
 691
 692         /* build the endpoint table */
 693         i = 0;
 694         last_bw = 0;
 695         for (;;) {
 696                 ep_tb->bandwidth = 2000 * 2000 * 120;
 697                 found = 0;
 698                 for (j = 0; j < nbalt; j++) {
 699                         ep = alt_xfer(&intf->altsetting[j],
 700                                       USB_ENDPOINT_XFER_ISOC);
 701                         if (ep == NULL)
 702                                 continue;
 703                         if (ep->desc.bInterval == 0) {
 704                                 pr_err("alt %d iso endp with 0 interval\n", j);
 705                                 continue;
 706                         }
 707                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 708                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 709                         bandwidth = psize * 1000;
 710                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 711                          || gspca_dev->dev->speed == USB_SPEED_SUPER)
 712                                 bandwidth *= 8;
 713                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 714                         if (bandwidth <= last_bw)
 715                                 continue;
 716                         if (bandwidth < ep_tb->bandwidth) {
 717                                 ep_tb->bandwidth = bandwidth;
 718                                 ep_tb->alt = j;
 719                                 found = 1;
 720                         }
 721                 }
 722                 if (!found)
 723                         break;
 724                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 725                                 ep_tb->alt, ep_tb->bandwidth);
 726                 last_bw = ep_tb->bandwidth;
 727                 i++;
 728                 ep_tb++;
 729         }
 730
 731         /*
 732          * If the camera:
 733          * has a usb audio class interface (a built in usb mic); and
 734          * is a usb 1 full speed device; and
 735          * uses the max full speed iso bandwidth; and
 736          * and has more than 1 alt setting
 737          * then skip the highest alt setting to spare bandwidth for the mic
 738          */
 739         if (gspca_dev->audio &&
 740                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 741                         last_bw >= 1000000 &&
 742                         i > 1) {
 743                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 744                 i--;
 745                 ep_tb--;
 746         }
 747
 748         /* get the requested bandwidth and start at the highest atlsetting */
 749         bandwidth = which_bandwidth(gspca_dev);
 750         ep_tb--;
 751         while (i > 1) {
 752                 ep_tb--;
 753                 if (ep_tb->bandwidth < bandwidth)
 754                         break;
 755                 i--;
 756         }
 757         return i;
 758 }
 759
 760 /*
 761  * create the URBs for image transfer
 762  */
 763 static int create_urbs(struct gspca_dev *gspca_dev,
 764                         struct usb_host_endpoint *ep)
 765 {
 766         struct urb *urb;
 767         int n, nurbs, i, psize, npkt, bsize;
 768
 769         /* calculate the packet size and the number of packets */
 770         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 771
 772         if (!gspca_dev->cam.bulk) {             /* isoc */
 773
 774                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 775                 if (gspca_dev->pkt_size == 0)
 776                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 777                 else
 778                         psize = gspca_dev->pkt_size;
 779                 npkt = gspca_dev->cam.npkt;
 780                 if (npkt == 0)
 781                         npkt = 32;              /* default value */
 782                 bsize = psize * npkt;
 783                 PDEBUG(D_STREAM,
 784                         "isoc %d pkts size %d = bsize:%d",
 785                         npkt, psize, bsize);
 786                 nurbs = DEF_NURBS;
 787         } else {                                /* bulk */
 788                 npkt = 0;
 789                 bsize = gspca_dev->cam.bulk_size;
 790                 if (bsize == 0)
 791                         bsize = psize;
 792                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 793                 if (gspca_dev->cam.bulk_nurbs != 0)
 794                         nurbs = gspca_dev->cam.bulk_nurbs;
 795                 else
 796                         nurbs = 1;
 797         }
 798
 799         for (n = 0; n < nurbs; n++) {
 800                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 801                 if (!urb) {
 802                         pr_err("usb_alloc_urb failed\n");
 803                         return -ENOMEM;
 804                 }
 805                 gspca_dev->urb[n] = urb;
 806                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 807                                                 bsize,
 808                                                 GFP_KERNEL,
 809                                                 &urb->transfer_dma);
 810
 811                 if (urb->transfer_buffer == NULL) {
 812                         pr_err("usb_alloc_coherent failed\n");
 813                         return -ENOMEM;
 814                 }
 815                 urb->dev = gspca_dev->dev;
 816                 urb->context = gspca_dev;
 817                 urb->transfer_buffer_length = bsize;
 818                 if (npkt != 0) {                /* ISOC */
 819                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 820                                                     ep->desc.bEndpointAddress);
 821                         urb->transfer_flags = URB_ISO_ASAP
 822                                         | URB_NO_TRANSFER_DMA_MAP;
 823                         urb->interval = 1 << (ep->desc.bInterval - 1);
 824                         urb->complete = isoc_irq;
 825                         urb->number_of_packets = npkt;
 826                         for (i = 0; i < npkt; i++) {
 827                                 urb->iso_frame_desc[i].length = psize;
 828                                 urb->iso_frame_desc[i].offset = psize * i;
 829                         }
 830                 } else {                /* bulk */
 831                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 832                                                 ep->desc.bEndpointAddress);
 833                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 834                         urb->complete = bulk_irq;
 835                 }
 836         }
 837         return 0;
 838 }
 839
 840 /*
 841  * start the USB transfer
 842  */
 843 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 844 {
 845         struct usb_interface *intf;
 846         struct usb_host_endpoint *ep;
 847         struct urb *urb;
 848         struct ep_tb_s ep_tb[MAX_ALT];
 849         int n, ret, xfer, alt, alt_idx;
 850
 851         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 852                 return -ERESTARTSYS;
 853
 854         if (!gspca_dev->present) {
 855                 ret = -ENODEV;
 856                 goto unlock;
 857         }
 858
 859         /* reset the streaming variables */
 860         gspca_dev->image = NULL;
 861         gspca_dev->image_len = 0;
 862         gspca_dev->last_packet_type = DISCARD_PACKET;
 863         gspca_dev->sequence = 0;
 864
 865         gspca_dev->usb_err = 0;
 866
 867         /* do the specific subdriver stuff before endpoint selection */
 868         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 869         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 870         if (gspca_dev->sd_desc->isoc_init) {
 871                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 872                 if (ret < 0)
 873                         goto unlock;
 874         }
 875         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 876                                    : USB_ENDPOINT_XFER_ISOC;
 877
 878         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 879         if (gspca_dev->alt != 0) {
 880                 gspca_dev->alt--;       /* (previous version compatibility) */
 881                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
 882                 if (ep == NULL) {
 883                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 884                         ret = -EIO;
 885                         goto out;
 886                 }
 887                 ep_tb[0].alt = gspca_dev->alt;
 888                 alt_idx = 1;
 889         } else {
 890
 891         /* else, compute the minimum bandwidth
 892          * and build the endpoint table */
 893                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 894                 if (alt_idx <= 0) {
 895                         pr_err("no transfer endpoint found\n");
 896                         ret = -EIO;
 897                         goto unlock;
 898                 }
 899         }
 900
 901         /* set the highest alternate setting and
 902          * loop until urb submit succeeds */
 903         gspca_input_destroy_urb(gspca_dev);
 904
 905         gspca_dev->alt = ep_tb[--alt_idx].alt;
 906         alt = -1;
 907         for (;;) {
 908                 if (alt != gspca_dev->alt) {
 909                         alt = gspca_dev->alt;
 910                         if (intf->num_altsetting > 1) {
 911                                 ret = usb_set_interface(gspca_dev->dev,
 912                                                         gspca_dev->iface,
 913                                                         alt);
 914                                 if (ret < 0) {
 915                                         if (ret == -ENOSPC)
 916                                                 goto retry; /*fixme: ugly*/
 917                                         pr_err("set alt %d err %d\n", alt, ret);
 918                                         goto out;
 919                                 }
 920                         }
 921                 }
 922                 if (!gspca_dev->cam.no_urb_create) {
 923                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 924                         ret = create_urbs(gspca_dev,
 925                                 alt_xfer(&intf->altsetting[alt], xfer));
 926                         if (ret < 0) {
 927                                 destroy_urbs(gspca_dev);
 928                                 goto out;
 929                         }
 930                 }
 931
 932                 /* clear the bulk endpoint */
 933                 if (gspca_dev->cam.bulk)
 934                         usb_clear_halt(gspca_dev->dev,
 935                                         gspca_dev->urb[0]->pipe);
 936
 937                 /* start the cam */
 938                 ret = gspca_dev->sd_desc->start(gspca_dev);
 939                 if (ret < 0) {
 940                         destroy_urbs(gspca_dev);
 941                         goto out;
 942                 }
 943                 gspca_dev->streaming = 1;
 944
 945                 /* some bulk transfers are started by the subdriver */
 946                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 947                         break;
 948
 949                 /* submit the URBs */
 950                 for (n = 0; n < MAX_NURBS; n++) {
 951                         urb = gspca_dev->urb[n];
 952                         if (urb == NULL)
 953                                 break;
 954                         ret = usb_submit_urb(urb, GFP_KERNEL);
 955                         if (ret < 0)
 956                                 break;
 957                 }
 958                 if (ret >= 0)
 959                         break;                  /* transfer is started */
 960
 961                 /* something when wrong
 962                  * stop the webcam and free the transfer resources */
 963                 gspca_stream_off(gspca_dev);
 964                 if (ret != -ENOSPC) {
 965                         pr_err("usb_submit_urb alt %d err %d\n",
 966                                gspca_dev->alt, ret);
 967                         goto out;
 968                 }
 969
 970                 /* the bandwidth is not wide enough
 971                  * negotiate or try a lower alternate setting */
 972 retry:
 973                 PDEBUG(D_ERR|D_STREAM,
 974                         "alt %d - bandwidth not wide enough - trying again",
 975                         alt);
 976                 msleep(20);     /* wait for kill complete */
 977                 if (gspca_dev->sd_desc->isoc_nego) {
 978                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 979                         if (ret < 0)
 980                                 goto out;
 981                 } else {
 982                         if (alt_idx <= 0) {
 983                                 pr_err("no transfer endpoint found\n");
 984                                 ret = -EIO;
 985                                 goto out;
 986                         }
 987                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 988                 }
 989         }
 990 out:
 991         gspca_input_create_urb(gspca_dev);
 992 unlock:
 993         mutex_unlock(&gspca_dev->usb_lock);
 994         return ret;
 995 }
 996
 997 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 998 {
 999         struct gspca_ctrl *ctrl;
1000         int i;
1001
1002         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
1003         gspca_dev->curr_mode = i;
1004         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
1005         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
1006         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
1007
1008         /* set the current control values to their default values
1009          * which may have changed in sd_init() */
1010         /* does nothing if ctrl_handler == NULL */
1011         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
1012         ctrl = gspca_dev->cam.ctrls;
1013         if (ctrl != NULL) {
1014                 for (i = 0;
1015                      i < gspca_dev->sd_desc->nctrls;
1016                      i++, ctrl++)
1017                         ctrl->val = ctrl->def;
1018         }
1019 }
1020
1021 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1022                         int width, int height)
1023 {
1024         int i;
1025
1026         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1027                 if (width >= gspca_dev->cam.cam_mode[i].width
1028                     && height >= gspca_dev->cam.cam_mode[i].height)
1029                         break;
1030         }
1031         return i;
1032 }
1033
1034 /*
1035  * search a mode with the right pixel format
1036  */
1037 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1038                         int mode,
1039                         int pixfmt)
1040 {
1041         int modeU, modeD;
1042
1043         modeU = modeD = mode;
1044         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1045                 if (--modeD >= 0) {
1046                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1047                                                                 == pixfmt)
1048                                 return modeD;
1049                 }
1050                 if (++modeU < gspca_dev->cam.nmodes) {
1051                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1052                                                                 == pixfmt)
1053                                 return modeU;
1054                 }
1055         }
1056         return -EINVAL;
1057 }
1058
1059 #ifdef CONFIG_VIDEO_ADV_DEBUG
1060 static int vidioc_g_register(struct file *file, void *priv,
1061                         struct v4l2_dbg_register *reg)
1062 {
1063         int ret;
1064         struct gspca_dev *gspca_dev = priv;
1065
1066         if (!gspca_dev->sd_desc->get_chip_ident)
1067                 return -EINVAL;
1068
1069         if (!gspca_dev->sd_desc->get_register)
1070                 return -EINVAL;
1071
1072         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1073                 return -ERESTARTSYS;
1074         gspca_dev->usb_err = 0;
1075         if (gspca_dev->present)
1076                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
1077         else
1078                 ret = -ENODEV;
1079         mutex_unlock(&gspca_dev->usb_lock);
1080
1081         return ret;
1082 }
1083
1084 static int vidioc_s_register(struct file *file, void *priv,
1085                         struct v4l2_dbg_register *reg)
1086 {
1087         int ret;
1088         struct gspca_dev *gspca_dev = priv;
1089
1090         if (!gspca_dev->sd_desc->get_chip_ident)
1091                 return -EINVAL;
1092
1093         if (!gspca_dev->sd_desc->set_register)
1094                 return -EINVAL;
1095
1096         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1097                 return -ERESTARTSYS;
1098         gspca_dev->usb_err = 0;
1099         if (gspca_dev->present)
1100                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
1101         else
1102                 ret = -ENODEV;
1103         mutex_unlock(&gspca_dev->usb_lock);
1104
1105         return ret;
1106 }
1107 #endif
1108
1109 static int vidioc_g_chip_ident(struct file *file, void *priv,
1110                         struct v4l2_dbg_chip_ident *chip)
1111 {
1112         int ret;
1113         struct gspca_dev *gspca_dev = priv;
1114
1115         if (!gspca_dev->sd_desc->get_chip_ident)
1116                 return -EINVAL;
1117
1118         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1119                 return -ERESTARTSYS;
1120         gspca_dev->usb_err = 0;
1121         if (gspca_dev->present)
1122                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1123         else
1124                 ret = -ENODEV;
1125         mutex_unlock(&gspca_dev->usb_lock);
1126
1127         return ret;
1128 }
1129
1130 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1131                                 struct v4l2_fmtdesc *fmtdesc)
1132 {
1133         struct gspca_dev *gspca_dev = priv;
1134         int i, j, index;
1135         __u32 fmt_tb[8];
1136
1137         /* give an index to each format */
1138         index = 0;
1139         j = 0;
1140         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1141                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1142                 j = 0;
1143                 for (;;) {
1144                         if (fmt_tb[j] == fmt_tb[index])
1145                                 break;
1146                         j++;
1147                 }
1148                 if (j == index) {
1149                         if (fmtdesc->index == index)
1150                                 break;          /* new format */
1151                         index++;
1152                         if (index >= ARRAY_SIZE(fmt_tb))
1153                                 return -EINVAL;
1154                 }
1155         }
1156         if (i < 0)
1157                 return -EINVAL;         /* no more format */
1158
1159         fmtdesc->pixelformat = fmt_tb[index];
1160         if (gspca_dev->cam.cam_mode[i].sizeimage <
1161                         gspca_dev->cam.cam_mode[i].width *
1162                                 gspca_dev->cam.cam_mode[i].height)
1163                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1164         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1165         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1166         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1167         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1168         fmtdesc->description[4] = '\0';
1169         return 0;
1170 }
1171
1172 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1173                             struct v4l2_format *fmt)
1174 {
1175         struct gspca_dev *gspca_dev = priv;
1176         int mode;
1177
1178         mode = gspca_dev->curr_mode;
1179         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1180                 sizeof fmt->fmt.pix);
1181         return 0;
1182 }
1183
1184 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1185                         struct v4l2_format *fmt)
1186 {
1187         int w, h, mode, mode2;
1188
1189         w = fmt->fmt.pix.width;
1190         h = fmt->fmt.pix.height;
1191
1192 #ifdef GSPCA_DEBUG
1193         if (gspca_debug & D_CONF)
1194                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1195 #endif
1196         /* search the closest mode for width and height */
1197         mode = wxh_to_mode(gspca_dev, w, h);
1198
1199         /* OK if right palette */
1200         if (gspca_dev->cam.cam_mode[mode].pixelformat
1201                                                 != fmt->fmt.pix.pixelformat) {
1202
1203                 /* else, search the closest mode with the same pixel format */
1204                 mode2 = gspca_get_mode(gspca_dev, mode,
1205                                         fmt->fmt.pix.pixelformat);
1206                 if (mode2 >= 0)
1207                         mode = mode2;
1208 /*              else
1209                         ;                * no chance, return this mode */
1210         }
1211         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1212                 sizeof fmt->fmt.pix);
1213         return mode;                    /* used when s_fmt */
1214 }
1215
1216 static int vidioc_try_fmt_vid_cap(struct file *file,
1217                               void *priv,
1218                               struct v4l2_format *fmt)
1219 {
1220         struct gspca_dev *gspca_dev = priv;
1221         int ret;
1222
1223         ret = try_fmt_vid_cap(gspca_dev, fmt);
1224         if (ret < 0)
1225                 return ret;
1226         return 0;
1227 }
1228
1229 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1230                             struct v4l2_format *fmt)
1231 {
1232         struct gspca_dev *gspca_dev = priv;
1233         int ret;
1234
1235         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1236                 return -ERESTARTSYS;
1237
1238         ret = try_fmt_vid_cap(gspca_dev, fmt);
1239         if (ret < 0)
1240                 goto out;
1241
1242         if (gspca_dev->nframes != 0
1243             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1244                 ret = -EINVAL;
1245                 goto out;
1246         }
1247
1248         if (ret == gspca_dev->curr_mode) {
1249                 ret = 0;
1250                 goto out;                       /* same mode */
1251         }
1252
1253         if (gspca_dev->streaming) {
1254                 ret = -EBUSY;
1255                 goto out;
1256         }
1257         gspca_dev->width = fmt->fmt.pix.width;
1258         gspca_dev->height = fmt->fmt.pix.height;
1259         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1260         gspca_dev->curr_mode = ret;
1261
1262         ret = 0;
1263 out:
1264         mutex_unlock(&gspca_dev->queue_lock);
1265         return ret;
1266 }
1267
1268 static int vidioc_enum_framesizes(struct file *file, void *priv,
1269                                   struct v4l2_frmsizeenum *fsize)
1270 {
1271         struct gspca_dev *gspca_dev = priv;
1272         int i;
1273         __u32 index = 0;
1274
1275         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1276                 if (fsize->pixel_format !=
1277                                 gspca_dev->cam.cam_mode[i].pixelformat)
1278                         continue;
1279
1280                 if (fsize->index == index) {
1281                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1282                         fsize->discrete.width =
1283                                 gspca_dev->cam.cam_mode[i].width;
1284                         fsize->discrete.height =
1285                                 gspca_dev->cam.cam_mode[i].height;
1286                         return 0;
1287                 }
1288                 index++;
1289         }
1290
1291         return -EINVAL;
1292 }
1293
1294 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1295                                       struct v4l2_frmivalenum *fival)
1296 {
1297         struct gspca_dev *gspca_dev = priv;
1298         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1299         __u32 i;
1300
1301         if (gspca_dev->cam.mode_framerates == NULL ||
1302                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1303                 return -EINVAL;
1304
1305         if (fival->pixel_format !=
1306                         gspca_dev->cam.cam_mode[mode].pixelformat)
1307                 return -EINVAL;
1308
1309         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1310                 if (fival->index == i) {
1311                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1312                         fival->discrete.numerator = 1;
1313                         fival->discrete.denominator =
1314                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1315                         return 0;
1316                 }
1317         }
1318
1319         return -EINVAL;
1320 }
1321
1322 static void gspca_release(struct video_device *vfd)
1323 {
1324         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1325
1326         PDEBUG(D_PROBE, "%s released",
1327                 video_device_node_name(&gspca_dev->vdev));
1328
1329         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1330         kfree(gspca_dev->usb_buf);
1331         kfree(gspca_dev);
1332 }
1333
1334 static int dev_open(struct file *file)
1335 {
1336         struct gspca_dev *gspca_dev;
1337
1338         PDEBUG(D_STREAM, "[%s] open", current->comm);
1339         gspca_dev = (struct gspca_dev *) video_devdata(file);
1340         if (!gspca_dev->present)
1341                 return -ENODEV;
1342
1343         /* protect the subdriver against rmmod */
1344         if (!try_module_get(gspca_dev->module))
1345                 return -ENODEV;
1346
1347         file->private_data = gspca_dev;
1348 #ifdef GSPCA_DEBUG
1349         /* activate the v4l2 debug */
1350         if (gspca_debug & D_V4L2)
1351                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1352                                         | V4L2_DEBUG_IOCTL_ARG;
1353         else
1354                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1355                                         | V4L2_DEBUG_IOCTL_ARG);
1356 #endif
1357         return 0;
1358 }
1359
1360 static int dev_close(struct file *file)
1361 {
1362         struct gspca_dev *gspca_dev = file->private_data;
1363
1364         PDEBUG(D_STREAM, "[%s] close", current->comm);
1365         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1366                 return -ERESTARTSYS;
1367
1368         /* if the file did the capture, free the streaming resources */
1369         if (gspca_dev->capt_file == file) {
1370                 if (gspca_dev->streaming) {
1371                         mutex_lock(&gspca_dev->usb_lock);
1372                         gspca_dev->usb_err = 0;
1373                         gspca_stream_off(gspca_dev);
1374                         mutex_unlock(&gspca_dev->usb_lock);
1375                 }
1376                 frame_free(gspca_dev);
1377         }
1378         file->private_data = NULL;
1379         module_put(gspca_dev->module);
1380         mutex_unlock(&gspca_dev->queue_lock);
1381
1382         PDEBUG(D_STREAM, "close done");
1383
1384         return 0;
1385 }
1386
1387 static int vidioc_querycap(struct file *file, void  *priv,
1388                            struct v4l2_capability *cap)
1389 {
1390         struct gspca_dev *gspca_dev = priv;
1391         int ret;
1392
1393         /* protect the access to the usb device */
1394         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1395                 return -ERESTARTSYS;
1396         if (!gspca_dev->present) {
1397                 ret = -ENODEV;
1398                 goto out;
1399         }
1400         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1401                         sizeof cap->driver);
1402         if (gspca_dev->dev->product != NULL) {
1403                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1404                         sizeof cap->card);
1405         } else {
1406                 snprintf((char *) cap->card, sizeof cap->card,
1407                         "USB Camera (%04x:%04x)",
1408                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1409                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1410         }
1411         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1412                         sizeof(cap->bus_info));
1413         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1414                           | V4L2_CAP_STREAMING
1415                           | V4L2_CAP_READWRITE;
1416         ret = 0;
1417 out:
1418         mutex_unlock(&gspca_dev->usb_lock);
1419         return ret;
1420 }
1421
1422 static int get_ctrl(struct gspca_dev *gspca_dev,
1423                                    int id)
1424 {
1425         const struct ctrl *ctrls;
1426         int i;
1427
1428         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1429              i < gspca_dev->sd_desc->nctrls;
1430              i++, ctrls++) {
1431                 if (gspca_dev->ctrl_dis & (1 << i))
1432                         continue;
1433                 if (id == ctrls->qctrl.id)
1434                         return i;
1435         }
1436         return -1;
1437 }
1438
1439 static int vidioc_queryctrl(struct file *file, void *priv,
1440                            struct v4l2_queryctrl *q_ctrl)
1441 {
1442         struct gspca_dev *gspca_dev = priv;
1443         const struct ctrl *ctrls;
1444         struct gspca_ctrl *gspca_ctrl;
1445         int i, idx;
1446         u32 id;
1447
1448         id = q_ctrl->id;
1449         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1450                 id &= V4L2_CTRL_ID_MASK;
1451                 id++;
1452                 idx = -1;
1453                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1454                         if (gspca_dev->ctrl_dis & (1 << i))
1455                                 continue;
1456                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1457                                 continue;
1458                         if (idx >= 0
1459                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1460                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1461                                 continue;
1462                         idx = i;
1463                 }
1464         } else {
1465                 idx = get_ctrl(gspca_dev, id);
1466         }
1467         if (idx < 0)
1468                 return -EINVAL;
1469         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1470         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1471         if (gspca_dev->cam.ctrls != NULL) {
1472                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1473                 q_ctrl->default_value = gspca_ctrl->def;
1474                 q_ctrl->minimum = gspca_ctrl->min;
1475                 q_ctrl->maximum = gspca_ctrl->max;
1476         }
1477         if (gspca_dev->ctrl_inac & (1 << idx))
1478                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1479         return 0;
1480 }
1481
1482 static int vidioc_s_ctrl(struct file *file, void *priv,
1483                          struct v4l2_control *ctrl)
1484 {
1485         struct gspca_dev *gspca_dev = priv;
1486         const struct ctrl *ctrls;
1487         struct gspca_ctrl *gspca_ctrl;
1488         int idx, ret;
1489
1490         idx = get_ctrl(gspca_dev, ctrl->id);
1491         if (idx < 0)
1492                 return -EINVAL;
1493         if (gspca_dev->ctrl_inac & (1 << idx))
1494                 return -EINVAL;
1495         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1496         if (gspca_dev->cam.ctrls != NULL) {
1497                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1498                 if (ctrl->value < gspca_ctrl->min
1499                     || ctrl->value > gspca_ctrl->max)
1500                         return -ERANGE;
1501         } else {
1502                 gspca_ctrl = NULL;
1503                 if (ctrl->value < ctrls->qctrl.minimum
1504                     || ctrl->value > ctrls->qctrl.maximum)
1505                         return -ERANGE;
1506         }
1507         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1508         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1509                 return -ERESTARTSYS;
1510         if (!gspca_dev->present) {
1511                 ret = -ENODEV;
1512                 goto out;
1513         }
1514         gspca_dev->usb_err = 0;
1515         if (ctrls->set != NULL) {
1516                 ret = ctrls->set(gspca_dev, ctrl->value);
1517                 goto out;
1518         }
1519         if (gspca_ctrl != NULL) {
1520                 gspca_ctrl->val = ctrl->value;
1521                 if (ctrls->set_control != NULL
1522                  && gspca_dev->streaming)
1523                         ctrls->set_control(gspca_dev);
1524         }
1525         ret = gspca_dev->usb_err;
1526 out:
1527         mutex_unlock(&gspca_dev->usb_lock);
1528         return ret;
1529 }
1530
1531 static int vidioc_g_ctrl(struct file *file, void *priv,
1532                          struct v4l2_control *ctrl)
1533 {
1534         struct gspca_dev *gspca_dev = priv;
1535         const struct ctrl *ctrls;
1536         int idx, ret;
1537
1538         idx = get_ctrl(gspca_dev, ctrl->id);
1539         if (idx < 0)
1540                 return -EINVAL;
1541         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1542
1543         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1544                 return -ERESTARTSYS;
1545         if (!gspca_dev->present) {
1546                 ret = -ENODEV;
1547                 goto out;
1548         }
1549         gspca_dev->usb_err = 0;
1550         if (ctrls->get != NULL) {
1551                 ret = ctrls->get(gspca_dev, &ctrl->value);
1552                 goto out;
1553         }
1554         if (gspca_dev->cam.ctrls != NULL)
1555                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1556         ret = 0;
1557 out:
1558         mutex_unlock(&gspca_dev->usb_lock);
1559         return ret;
1560 }
1561
1562 static int vidioc_querymenu(struct file *file, void *priv,
1563                             struct v4l2_querymenu *qmenu)
1564 {
1565         struct gspca_dev *gspca_dev = priv;
1566
1567         if (!gspca_dev->sd_desc->querymenu)
1568                 return -EINVAL;
1569         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1570 }
1571
1572 static int vidioc_enum_input(struct file *file, void *priv,
1573                                 struct v4l2_input *input)
1574 {
1575         struct gspca_dev *gspca_dev = priv;
1576
1577         if (input->index != 0)
1578                 return -EINVAL;
1579         input->type = V4L2_INPUT_TYPE_CAMERA;
1580         input->status = gspca_dev->cam.input_flags;
1581         strlcpy(input->name, gspca_dev->sd_desc->name,
1582                 sizeof input->name);
1583         return 0;
1584 }
1585
1586 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1587 {
1588         *i = 0;
1589         return 0;
1590 }
1591
1592 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1593 {
1594         if (i > 0)
1595                 return -EINVAL;
1596         return (0);
1597 }
1598
1599 static int vidioc_reqbufs(struct file *file, void *priv,
1600                           struct v4l2_requestbuffers *rb)
1601 {
1602         struct gspca_dev *gspca_dev = priv;
1603         int i, ret = 0, streaming;
1604
1605         i = rb->memory;                 /* (avoid compilation warning) */
1606         switch (i) {
1607         case GSPCA_MEMORY_READ:                 /* (internal call) */
1608         case V4L2_MEMORY_MMAP:
1609         case V4L2_MEMORY_USERPTR:
1610                 break;
1611         default:
1612                 return -EINVAL;
1613         }
1614         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1615                 return -ERESTARTSYS;
1616
1617         if (gspca_dev->memory != GSPCA_MEMORY_NO
1618             && gspca_dev->memory != GSPCA_MEMORY_READ
1619             && gspca_dev->memory != rb->memory) {
1620                 ret = -EBUSY;
1621                 goto out;
1622         }
1623
1624         /* only one file may do the capture */
1625         if (gspca_dev->capt_file != NULL
1626             && gspca_dev->capt_file != file) {
1627                 ret = -EBUSY;
1628                 goto out;
1629         }
1630
1631         /* if allocated, the buffers must not be mapped */
1632         for (i = 0; i < gspca_dev->nframes; i++) {
1633                 if (gspca_dev->frame[i].vma_use_count) {
1634                         ret = -EBUSY;
1635                         goto out;
1636                 }
1637         }
1638
1639         /* stop streaming */
1640         streaming = gspca_dev->streaming;
1641         if (streaming) {
1642                 mutex_lock(&gspca_dev->usb_lock);
1643                 gspca_dev->usb_err = 0;
1644                 gspca_stream_off(gspca_dev);
1645                 mutex_unlock(&gspca_dev->usb_lock);
1646
1647                 /* Don't restart the stream when switching from read
1648                  * to mmap mode */
1649                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1650                         streaming = 0;
1651         }
1652
1653         /* free the previous allocated buffers, if any */
1654         if (gspca_dev->nframes != 0)
1655                 frame_free(gspca_dev);
1656         if (rb->count == 0)                     /* unrequest */
1657                 goto out;
1658         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1659         if (ret == 0) {
1660                 rb->count = gspca_dev->nframes;
1661                 if (streaming)
1662                         ret = gspca_init_transfer(gspca_dev);
1663         }
1664 out:
1665         mutex_unlock(&gspca_dev->queue_lock);
1666         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1667         return ret;
1668 }
1669
1670 static int vidioc_querybuf(struct file *file, void *priv,
1671                            struct v4l2_buffer *v4l2_buf)
1672 {
1673         struct gspca_dev *gspca_dev = priv;
1674         struct gspca_frame *frame;
1675
1676         if (v4l2_buf->index < 0
1677             || v4l2_buf->index >= gspca_dev->nframes)
1678                 return -EINVAL;
1679
1680         frame = &gspca_dev->frame[v4l2_buf->index];
1681         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1682         return 0;
1683 }
1684
1685 static int vidioc_streamon(struct file *file, void *priv,
1686                            enum v4l2_buf_type buf_type)
1687 {
1688         struct gspca_dev *gspca_dev = priv;
1689         int ret;
1690
1691         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1692                 return -EINVAL;
1693         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1694                 return -ERESTARTSYS;
1695
1696         /* check the capture file */
1697         if (gspca_dev->capt_file != file) {
1698                 ret = -EBUSY;
1699                 goto out;
1700         }
1701
1702         if (gspca_dev->nframes == 0
1703             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1704                 ret = -EINVAL;
1705                 goto out;
1706         }
1707         if (!gspca_dev->streaming) {
1708                 ret = gspca_init_transfer(gspca_dev);
1709                 if (ret < 0)
1710                         goto out;
1711         }
1712 #ifdef GSPCA_DEBUG
1713         if (gspca_debug & D_STREAM) {
1714                 PDEBUG_MODE("stream on OK",
1715                         gspca_dev->pixfmt,
1716                         gspca_dev->width,
1717                         gspca_dev->height);
1718         }
1719 #endif
1720         ret = 0;
1721 out:
1722         mutex_unlock(&gspca_dev->queue_lock);
1723         return ret;
1724 }
1725
1726 static int vidioc_streamoff(struct file *file, void *priv,
1727                                 enum v4l2_buf_type buf_type)
1728 {
1729         struct gspca_dev *gspca_dev = priv;
1730         int ret;
1731
1732         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1733                 return -EINVAL;
1734
1735         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1736                 return -ERESTARTSYS;
1737
1738         if (!gspca_dev->streaming) {
1739                 ret = 0;
1740                 goto out;
1741         }
1742
1743         /* check the capture file */
1744         if (gspca_dev->capt_file != file) {
1745                 ret = -EBUSY;
1746                 goto out;
1747         }
1748
1749         /* stop streaming */
1750         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1751                 ret = -ERESTARTSYS;
1752                 goto out;
1753         }
1754         gspca_dev->usb_err = 0;
1755         gspca_stream_off(gspca_dev);
1756         mutex_unlock(&gspca_dev->usb_lock);
1757         /* In case another thread is waiting in dqbuf */
1758         wake_up_interruptible(&gspca_dev->wq);
1759
1760         /* empty the transfer queues */
1761         atomic_set(&gspca_dev->fr_q, 0);
1762         atomic_set(&gspca_dev->fr_i, 0);
1763         gspca_dev->fr_o = 0;
1764         ret = 0;
1765 out:
1766         mutex_unlock(&gspca_dev->queue_lock);
1767         return ret;
1768 }
1769
1770 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1771                         struct v4l2_jpegcompression *jpegcomp)
1772 {
1773         struct gspca_dev *gspca_dev = priv;
1774         int ret;
1775
1776         if (!gspca_dev->sd_desc->get_jcomp)
1777                 return -EINVAL;
1778         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1779                 return -ERESTARTSYS;
1780         gspca_dev->usb_err = 0;
1781         if (gspca_dev->present)
1782                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1783         else
1784                 ret = -ENODEV;
1785         mutex_unlock(&gspca_dev->usb_lock);
1786         return ret;
1787 }
1788
1789 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1790                         struct v4l2_jpegcompression *jpegcomp)
1791 {
1792         struct gspca_dev *gspca_dev = priv;
1793         int ret;
1794
1795         if (!gspca_dev->sd_desc->set_jcomp)
1796                 return -EINVAL;
1797         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1798                 return -ERESTARTSYS;
1799         gspca_dev->usb_err = 0;
1800         if (gspca_dev->present)
1801                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1802         else
1803                 ret = -ENODEV;
1804         mutex_unlock(&gspca_dev->usb_lock);
1805         return ret;
1806 }
1807
1808 static int vidioc_g_parm(struct file *filp, void *priv,
1809                         struct v4l2_streamparm *parm)
1810 {
1811         struct gspca_dev *gspca_dev = priv;
1812
1813         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1814
1815         if (gspca_dev->sd_desc->get_streamparm) {
1816                 int ret;
1817
1818                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1819                         return -ERESTARTSYS;
1820                 if (gspca_dev->present) {
1821                         gspca_dev->usb_err = 0;
1822                         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1823                         ret = gspca_dev->usb_err;
1824                 } else {
1825                         ret = -ENODEV;
1826                 }
1827                 mutex_unlock(&gspca_dev->usb_lock);
1828                 return ret;
1829         }
1830
1831         return 0;
1832 }
1833
1834 static int vidioc_s_parm(struct file *filp, void *priv,
1835                         struct v4l2_streamparm *parm)
1836 {
1837         struct gspca_dev *gspca_dev = priv;
1838         int n;
1839
1840         n = parm->parm.capture.readbuffers;
1841         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1842                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1843         else
1844                 gspca_dev->nbufread = n;
1845
1846         if (gspca_dev->sd_desc->set_streamparm) {
1847                 int ret;
1848
1849                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1850                         return -ERESTARTSYS;
1851                 if (gspca_dev->present) {
1852                         gspca_dev->usb_err = 0;
1853                         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1854                         ret = gspca_dev->usb_err;
1855                 } else {
1856                         ret = -ENODEV;
1857                 }
1858                 mutex_unlock(&gspca_dev->usb_lock);
1859                 return ret;
1860         }
1861
1862         return 0;
1863 }
1864
1865 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1866 {
1867         struct gspca_dev *gspca_dev = file->private_data;
1868         struct gspca_frame *frame;
1869         struct page *page;
1870         unsigned long addr, start, size;
1871         int i, ret;
1872
1873         start = vma->vm_start;
1874         size = vma->vm_end - vma->vm_start;
1875         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1876
1877         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1878                 return -ERESTARTSYS;
1879         if (!gspca_dev->present) {
1880                 ret = -ENODEV;
1881                 goto out;
1882         }
1883         if (gspca_dev->capt_file != file) {
1884                 ret = -EINVAL;
1885                 goto out;
1886         }
1887
1888         frame = NULL;
1889         for (i = 0; i < gspca_dev->nframes; ++i) {
1890                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1891                         PDEBUG(D_STREAM, "mmap bad memory type");
1892                         break;
1893                 }
1894                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1895                                                 == vma->vm_pgoff) {
1896                         frame = &gspca_dev->frame[i];
1897                         break;
1898                 }
1899         }
1900         if (frame == NULL) {
1901                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1902                 ret = -EINVAL;
1903                 goto out;
1904         }
1905         if (size != frame->v4l2_buf.length) {
1906                 PDEBUG(D_STREAM, "mmap bad size");
1907                 ret = -EINVAL;
1908                 goto out;
1909         }
1910
1911         /*
1912          * - VM_IO marks the area as being a mmaped region for I/O to a
1913          *   device. It also prevents the region from being core dumped.
1914          */
1915         vma->vm_flags |= VM_IO;
1916
1917         addr = (unsigned long) frame->data;
1918         while (size > 0) {
1919                 page = vmalloc_to_page((void *) addr);
1920                 ret = vm_insert_page(vma, start, page);
1921                 if (ret < 0)
1922                         goto out;
1923                 start += PAGE_SIZE;
1924                 addr += PAGE_SIZE;
1925                 size -= PAGE_SIZE;
1926         }
1927
1928         vma->vm_ops = &gspca_vm_ops;
1929         vma->vm_private_data = frame;
1930         gspca_vm_open(vma);
1931         ret = 0;
1932 out:
1933         mutex_unlock(&gspca_dev->queue_lock);
1934         return ret;
1935 }
1936
1937 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1938                                 enum v4l2_memory memory)
1939 {
1940         if (!gspca_dev->present)
1941                 return -ENODEV;
1942         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1943                         !gspca_dev->streaming)
1944                 return -EINVAL;
1945
1946         /* check if a frame is ready */
1947         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1948 }
1949
1950 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1951                         enum v4l2_memory memory)
1952 {
1953         int ret;
1954
1955         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1956                 return -ERESTARTSYS;
1957         ret = frame_ready_nolock(gspca_dev, file, memory);
1958         mutex_unlock(&gspca_dev->queue_lock);
1959         return ret;
1960 }
1961
1962 /*
1963  * dequeue a video buffer
1964  *
1965  * If nonblock_ing is false, block until a buffer is available.
1966  */
1967 static int vidioc_dqbuf(struct file *file, void *priv,
1968                         struct v4l2_buffer *v4l2_buf)
1969 {
1970         struct gspca_dev *gspca_dev = priv;
1971         struct gspca_frame *frame;
1972         int i, j, ret;
1973
1974         PDEBUG(D_FRAM, "dqbuf");
1975
1976         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1977                 return -ERESTARTSYS;
1978
1979         for (;;) {
1980                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1981                 if (ret < 0)
1982                         goto out;
1983                 if (ret > 0)
1984                         break;
1985
1986                 mutex_unlock(&gspca_dev->queue_lock);
1987
1988                 if (file->f_flags & O_NONBLOCK)
1989                         return -EAGAIN;
1990
1991                 /* wait till a frame is ready */
1992                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1993                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1994                         msecs_to_jiffies(3000));
1995                 if (ret < 0)
1996                         return ret;
1997                 if (ret == 0)
1998                         return -EIO;
1999
2000                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
2001                         return -ERESTARTSYS;
2002         }
2003
2004         i = gspca_dev->fr_o;
2005         j = gspca_dev->fr_queue[i];
2006         frame = &gspca_dev->frame[j];
2007
2008         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
2009
2010         if (gspca_dev->sd_desc->dq_callback) {
2011                 mutex_lock(&gspca_dev->usb_lock);
2012                 gspca_dev->usb_err = 0;
2013                 if (gspca_dev->present)
2014                         gspca_dev->sd_desc->dq_callback(gspca_dev);
2015                 mutex_unlock(&gspca_dev->usb_lock);
2016         }
2017
2018         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
2019         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
2020         PDEBUG(D_FRAM, "dqbuf %d", j);
2021         ret = 0;
2022
2023         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
2024                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
2025                                  frame->data,
2026                                  frame->v4l2_buf.bytesused)) {
2027                         PDEBUG(D_ERR|D_STREAM,
2028                                 "dqbuf cp to user failed");
2029                         ret = -EFAULT;
2030                 }
2031         }
2032 out:
2033         mutex_unlock(&gspca_dev->queue_lock);
2034         return ret;
2035 }
2036
2037 /*
2038  * queue a video buffer
2039  *
2040  * Attempting to queue a buffer that has already been
2041  * queued will return -EINVAL.
2042  */
2043 static int vidioc_qbuf(struct file *file, void *priv,
2044                         struct v4l2_buffer *v4l2_buf)
2045 {
2046         struct gspca_dev *gspca_dev = priv;
2047         struct gspca_frame *frame;
2048         int i, index, ret;
2049
2050         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
2051
2052         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
2053                 return -ERESTARTSYS;
2054
2055         index = v4l2_buf->index;
2056         if ((unsigned) index >= gspca_dev->nframes) {
2057                 PDEBUG(D_FRAM,
2058                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
2059                 ret = -EINVAL;
2060                 goto out;
2061         }
2062         if (v4l2_buf->memory != gspca_dev->memory) {
2063                 PDEBUG(D_FRAM, "qbuf bad memory type");
2064                 ret = -EINVAL;
2065                 goto out;
2066         }
2067
2068         frame = &gspca_dev->frame[index];
2069         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
2070                 PDEBUG(D_FRAM, "qbuf bad state");
2071                 ret = -EINVAL;
2072                 goto out;
2073         }
2074
2075         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
2076
2077         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
2078                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
2079                 frame->v4l2_buf.length = v4l2_buf->length;
2080         }
2081
2082         /* put the buffer in the 'queued' queue */
2083         i = atomic_read(&gspca_dev->fr_q);
2084         gspca_dev->fr_queue[i] = index;
2085         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
2086
2087         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
2088         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
2089         ret = 0;
2090 out:
2091         mutex_unlock(&gspca_dev->queue_lock);
2092         return ret;
2093 }
2094
2095 /*
2096  * allocate the resources for read()
2097  */
2098 static int read_alloc(struct gspca_dev *gspca_dev,
2099                         struct file *file)
2100 {
2101         struct v4l2_buffer v4l2_buf;
2102         int i, ret;
2103
2104         PDEBUG(D_STREAM, "read alloc");
2105         if (gspca_dev->nframes == 0) {
2106                 struct v4l2_requestbuffers rb;
2107
2108                 memset(&rb, 0, sizeof rb);
2109                 rb.count = gspca_dev->nbufread;
2110                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2111                 rb.memory = GSPCA_MEMORY_READ;
2112                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
2113                 if (ret != 0) {
2114                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2115                         return ret;
2116                 }
2117                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2118                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2119                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2120                 for (i = 0; i < gspca_dev->nbufread; i++) {
2121                         v4l2_buf.index = i;
2122                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2123                         if (ret != 0) {
2124                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2125                                 return ret;
2126                         }
2127                 }
2128                 gspca_dev->memory = GSPCA_MEMORY_READ;
2129         }
2130
2131         /* start streaming */
2132         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2133         if (ret != 0)
2134                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2135         return ret;
2136 }
2137
2138 static unsigned int dev_poll(struct file *file, poll_table *wait)
2139 {
2140         struct gspca_dev *gspca_dev = file->private_data;
2141         int ret;
2142
2143         PDEBUG(D_FRAM, "poll");
2144
2145         poll_wait(file, &gspca_dev->wq, wait);
2146
2147         /* if reqbufs is not done, the user would use read() */
2148         if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2149                 ret = read_alloc(gspca_dev, file);
2150                 if (ret != 0)
2151                         return POLLERR;
2152         }
2153
2154         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2155                 return POLLERR;
2156
2157         /* check if an image has been received */
2158         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2159                 ret = POLLIN | POLLRDNORM;      /* yes */
2160         else
2161                 ret = 0;
2162         mutex_unlock(&gspca_dev->queue_lock);
2163         if (!gspca_dev->present)
2164                 return POLLHUP;
2165         return ret;
2166 }
2167
2168 static ssize_t dev_read(struct file *file, char __user *data,
2169                     size_t count, loff_t *ppos)
2170 {
2171         struct gspca_dev *gspca_dev = file->private_data;
2172         struct gspca_frame *frame;
2173         struct v4l2_buffer v4l2_buf;
2174         struct timeval timestamp;
2175         int n, ret, ret2;
2176
2177         PDEBUG(D_FRAM, "read (%zd)", count);
2178         if (!gspca_dev->present)
2179                 return -ENODEV;
2180         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2181                 ret = read_alloc(gspca_dev, file);
2182                 if (ret != 0)
2183                         return ret;
2184         }
2185
2186         /* get a frame */
2187         timestamp = ktime_to_timeval(ktime_get());
2188         timestamp.tv_sec--;
2189         n = 2;
2190         for (;;) {
2191                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2192                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2193                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2194                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2195                 if (ret != 0) {
2196                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2197                         return ret;
2198                 }
2199
2200                 /* if the process slept for more than 1 second,
2201                  * get a newer frame */
2202                 frame = &gspca_dev->frame[v4l2_buf.index];
2203                 if (--n < 0)
2204                         break;                  /* avoid infinite loop */
2205                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2206                         break;
2207                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2208                 if (ret != 0) {
2209                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2210                         return ret;
2211                 }
2212         }
2213
2214         /* copy the frame */
2215         if (count > frame->v4l2_buf.bytesused)
2216                 count = frame->v4l2_buf.bytesused;
2217         ret = copy_to_user(data, frame->data, count);
2218         if (ret != 0) {
2219                 PDEBUG(D_ERR|D_STREAM,
2220                         "read cp to user lack %d / %zd", ret, count);
2221                 ret = -EFAULT;
2222                 goto out;
2223         }
2224         ret = count;
2225 out:
2226         /* in each case, requeue the buffer */
2227         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2228         if (ret2 != 0)
2229                 return ret2;
2230         return ret;
2231 }
2232
2233 static struct v4l2_file_operations dev_fops = {
2234         .owner = THIS_MODULE,
2235         .open = dev_open,
2236         .release = dev_close,
2237         .read = dev_read,
2238         .mmap = dev_mmap,
2239         .unlocked_ioctl = video_ioctl2,
2240         .poll   = dev_poll,
2241 };
2242
2243 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2244         .vidioc_querycap        = vidioc_querycap,
2245         .vidioc_dqbuf           = vidioc_dqbuf,
2246         .vidioc_qbuf            = vidioc_qbuf,
2247         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2248         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2249         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2250         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2251         .vidioc_streamon        = vidioc_streamon,
2252         .vidioc_queryctrl       = vidioc_queryctrl,
2253         .vidioc_g_ctrl          = vidioc_g_ctrl,
2254         .vidioc_s_ctrl          = vidioc_s_ctrl,
2255         .vidioc_querymenu       = vidioc_querymenu,
2256         .vidioc_enum_input      = vidioc_enum_input,
2257         .vidioc_g_input         = vidioc_g_input,
2258         .vidioc_s_input         = vidioc_s_input,
2259         .vidioc_reqbufs         = vidioc_reqbufs,
2260         .vidioc_querybuf        = vidioc_querybuf,
2261         .vidioc_streamoff       = vidioc_streamoff,
2262         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2263         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2264         .vidioc_g_parm          = vidioc_g_parm,
2265         .vidioc_s_parm          = vidioc_s_parm,
2266         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2267         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2268 #ifdef CONFIG_VIDEO_ADV_DEBUG
2269         .vidioc_g_register      = vidioc_g_register,
2270         .vidioc_s_register      = vidioc_s_register,
2271 #endif
2272         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2273 };
2274
2275 static const struct video_device gspca_template = {
2276         .name = "gspca main driver",
2277         .fops = &dev_fops,
2278         .ioctl_ops = &dev_ioctl_ops,
2279         .release = gspca_release,
2280 };
2281
2282 /* initialize the controls */
2283 static void ctrls_init(struct gspca_dev *gspca_dev)
2284 {
2285         struct gspca_ctrl *ctrl;
2286         int i;
2287
2288         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2289              i < gspca_dev->sd_desc->nctrls;
2290              i++, ctrl++) {
2291                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2292                 ctrl->val = ctrl->def;
2293                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2294                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2295         }
2296 }
2297
2298 /*
2299  * probe and create a new gspca device
2300  *
2301  * This function must be called by the sub-driver when it is
2302  * called for probing a new device.
2303  */
2304 int gspca_dev_probe2(struct usb_interface *intf,
2305                 const struct usb_device_id *id,
2306                 const struct sd_desc *sd_desc,
2307                 int dev_size,
2308                 struct module *module)
2309 {
2310         struct gspca_dev *gspca_dev;
2311         struct usb_device *dev = interface_to_usbdev(intf);
2312         int ret;
2313
2314         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2315                 sd_desc->name, id->idVendor, id->idProduct);
2316
2317         /* create the device */
2318         if (dev_size < sizeof *gspca_dev)
2319                 dev_size = sizeof *gspca_dev;
2320         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2321         if (!gspca_dev) {
2322                 pr_err("couldn't kzalloc gspca struct\n");
2323                 return -ENOMEM;
2324         }
2325         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2326         if (!gspca_dev->usb_buf) {
2327                 pr_err("out of memory\n");
2328                 ret = -ENOMEM;
2329                 goto out;
2330         }
2331         gspca_dev->dev = dev;
2332         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2333
2334         /* check if any audio device */
2335         if (dev->actconfig->desc.bNumInterfaces != 1) {
2336                 int i;
2337                 struct usb_interface *intf2;
2338
2339                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2340                         intf2 = dev->actconfig->interface[i];
2341                         if (intf2 != NULL
2342                          && intf2->altsetting != NULL
2343                          && intf2->altsetting->desc.bInterfaceClass ==
2344                                          USB_CLASS_AUDIO) {
2345                                 gspca_dev->audio = 1;
2346                                 break;
2347                         }
2348                 }
2349         }
2350
2351         gspca_dev->sd_desc = sd_desc;
2352         gspca_dev->nbufread = 2;
2353         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2354         gspca_dev->vdev = gspca_template;
2355         gspca_dev->vdev.parent = &intf->dev;
2356         gspca_dev->module = module;
2357         gspca_dev->present = 1;
2358
2359         mutex_init(&gspca_dev->usb_lock);
2360         mutex_init(&gspca_dev->queue_lock);
2361         init_waitqueue_head(&gspca_dev->wq);
2362
2363         /* configure the subdriver and initialize the USB device */
2364         ret = sd_desc->config(gspca_dev, id);
2365         if (ret < 0)
2366                 goto out;
2367         if (gspca_dev->cam.ctrls != NULL)
2368                 ctrls_init(gspca_dev);
2369         ret = sd_desc->init(gspca_dev);
2370         if (ret < 0)
2371                 goto out;
2372         if (sd_desc->init_controls)
2373                 ret = sd_desc->init_controls(gspca_dev);
2374         if (ret < 0)
2375                 goto out;
2376         gspca_set_default_mode(gspca_dev);
2377
2378         ret = gspca_input_connect(gspca_dev);
2379         if (ret)
2380                 goto out;
2381
2382         /* init video stuff */
2383         ret = video_register_device(&gspca_dev->vdev,
2384                                   VFL_TYPE_GRABBER,
2385                                   -1);
2386         if (ret < 0) {
2387                 pr_err("video_register_device err %d\n", ret);
2388                 goto out;
2389         }
2390
2391         usb_set_intfdata(intf, gspca_dev);
2392         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2393
2394         gspca_input_create_urb(gspca_dev);
2395
2396         return 0;
2397 out:
2398 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2399         if (gspca_dev->input_dev)
2400                 input_unregister_device(gspca_dev->input_dev);
2401 #endif
2402         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2403         kfree(gspca_dev->usb_buf);
2404         kfree(gspca_dev);
2405         return ret;
2406 }
2407 EXPORT_SYMBOL(gspca_dev_probe2);
2408
2409 /* same function as the previous one, but check the interface */
2410 int gspca_dev_probe(struct usb_interface *intf,
2411                 const struct usb_device_id *id,
2412                 const struct sd_desc *sd_desc,
2413                 int dev_size,
2414                 struct module *module)
2415 {
2416         struct usb_device *dev = interface_to_usbdev(intf);
2417
2418         /* we don't handle multi-config cameras */
2419         if (dev->descriptor.bNumConfigurations != 1) {
2420                 pr_err("%04x:%04x too many config\n",
2421                        id->idVendor, id->idProduct);
2422                 return -ENODEV;
2423         }
2424
2425         /* the USB video interface must be the first one */
2426         if (dev->actconfig->desc.bNumInterfaces != 1
2427          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2428                 return -ENODEV;
2429
2430         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2431 }
2432 EXPORT_SYMBOL(gspca_dev_probe);
2433
2434 /*
2435  * USB disconnection
2436  *
2437  * This function must be called by the sub-driver
2438  * when the device disconnects, after the specific resources are freed.
2439  */
2440 void gspca_disconnect(struct usb_interface *intf)
2441 {
2442         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2443 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2444         struct input_dev *input_dev;
2445 #endif
2446
2447         PDEBUG(D_PROBE, "%s disconnect",
2448                 video_device_node_name(&gspca_dev->vdev));
2449         mutex_lock(&gspca_dev->usb_lock);
2450
2451         gspca_dev->present = 0;
2452         wake_up_interruptible(&gspca_dev->wq);
2453
2454         destroy_urbs(gspca_dev);
2455
2456 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2457         gspca_input_destroy_urb(gspca_dev);
2458         input_dev = gspca_dev->input_dev;
2459         if (input_dev) {
2460                 gspca_dev->input_dev = NULL;
2461                 input_unregister_device(input_dev);
2462         }
2463 #endif
2464
2465         /* the device is freed at exit of this function */
2466         gspca_dev->dev = NULL;
2467         mutex_unlock(&gspca_dev->usb_lock);
2468
2469         usb_set_intfdata(intf, NULL);
2470
2471         /* release the device */
2472         /* (this will call gspca_release() immediately or on last close) */
2473         video_unregister_device(&gspca_dev->vdev);
2474
2475 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2476 }
2477 EXPORT_SYMBOL(gspca_disconnect);
2478
2479 #ifdef CONFIG_PM
2480 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2481 {
2482         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2483
2484         if (!gspca_dev->streaming)
2485                 return 0;
2486         gspca_dev->frozen = 1;          /* avoid urb error messages */
2487         if (gspca_dev->sd_desc->stopN)
2488                 gspca_dev->sd_desc->stopN(gspca_dev);
2489         destroy_urbs(gspca_dev);
2490         gspca_input_destroy_urb(gspca_dev);
2491         gspca_set_alt0(gspca_dev);
2492         if (gspca_dev->sd_desc->stop0)
2493                 gspca_dev->sd_desc->stop0(gspca_dev);
2494         return 0;
2495 }
2496 EXPORT_SYMBOL(gspca_suspend);
2497
2498 int gspca_resume(struct usb_interface *intf)
2499 {
2500         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2501         int streaming;
2502
2503         gspca_dev->frozen = 0;
2504         gspca_dev->sd_desc->init(gspca_dev);
2505         gspca_input_create_urb(gspca_dev);
2506         /*
2507          * Most subdrivers send all ctrl values on sd_start and thus
2508          * only write to the device registers on s_ctrl when streaming ->
2509          * Clear streaming to avoid setting all ctrls twice.
2510          */
2511         streaming = gspca_dev->streaming;
2512         gspca_dev->streaming = 0;
2513         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
2514         if (streaming)
2515                 return gspca_init_transfer(gspca_dev);
2516         return 0;
2517 }
2518 EXPORT_SYMBOL(gspca_resume);
2519 #endif
2520 /* -- cam driver utility functions -- */
2521
2522 /* auto gain and exposure algorithm based on the knee algorithm described here:
2523    http://ytse.tricolour.net/docs/LowLightOptimization.html
2524
2525    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2526    where changed. */
2527 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2528         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2529 {
2530         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2531         const struct ctrl *gain_ctrl = NULL;
2532         const struct ctrl *exposure_ctrl = NULL;
2533         const struct ctrl *autogain_ctrl = NULL;
2534         int retval = 0;
2535
2536         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2537                 if (gspca_dev->ctrl_dis & (1 << i))
2538                         continue;
2539                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2540                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2541                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2542                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2543                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2544                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2545         }
2546         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2547                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2548                         "on cam without (auto)gain/exposure");
2549                 return 0;
2550         }
2551
2552         if (gain_ctrl->get(gspca_dev, &gain) ||
2553                         exposure_ctrl->get(gspca_dev, &exposure) ||
2554                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2555                 return 0;
2556
2557         orig_gain = gain;
2558         orig_exposure = exposure;
2559
2560         /* If we are of a multiple of deadzone, do multiple steps to reach the
2561            desired lumination fast (with the risc of a slight overshoot) */
2562         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2563
2564         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2565                 avg_lum, desired_avg_lum, steps);
2566
2567         for (i = 0; i < steps; i++) {
2568                 if (avg_lum > desired_avg_lum) {
2569                         if (gain > gain_knee)
2570                                 gain--;
2571                         else if (exposure > exposure_knee)
2572                                 exposure--;
2573                         else if (gain > gain_ctrl->qctrl.default_value)
2574                                 gain--;
2575                         else if (exposure > exposure_ctrl->qctrl.minimum)
2576                                 exposure--;
2577                         else if (gain > gain_ctrl->qctrl.minimum)
2578                                 gain--;
2579                         else
2580                                 break;
2581                 } else {
2582                         if (gain < gain_ctrl->qctrl.default_value)
2583                                 gain++;
2584                         else if (exposure < exposure_knee)
2585                                 exposure++;
2586                         else if (gain < gain_knee)
2587                                 gain++;
2588                         else if (exposure < exposure_ctrl->qctrl.maximum)
2589                                 exposure++;
2590                         else if (gain < gain_ctrl->qctrl.maximum)
2591                                 gain++;
2592                         else
2593                                 break;
2594                 }
2595         }
2596
2597         if (gain != orig_gain) {
2598                 gain_ctrl->set(gspca_dev, gain);
2599                 retval = 1;
2600         }
2601         if (exposure != orig_exposure) {
2602                 exposure_ctrl->set(gspca_dev, exposure);
2603                 retval = 1;
2604         }
2605
2606         return retval;
2607 }
2608 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2609
2610 /* -- module insert / remove -- */
2611 static int __init gspca_init(void)
2612 {
2613         pr_info("v" GSPCA_VERSION " registered\n");
2614         return 0;
2615 }
2616 static void __exit gspca_exit(void)
2617 {
2618 }
2619
2620 module_init(gspca_init);
2621 module_exit(gspca_exit);
2622
2623 #ifdef GSPCA_DEBUG
2624 module_param_named(debug, gspca_debug, int, 0644);
2625 MODULE_PARM_DESC(debug,
2626                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2627                 " 0x08:stream 0x10:frame 0x20:packet"
2628                 " 0x0100: v4l2");
2629 #endif