drivers/media/video/em28xx/em28xx-video.c

   1 /*
   2    em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9         Some parts based on SN9C10x PC Camera Controllers GPL driver made
  10                 by Luca Risolia <luca.risolia@studio.unibo.it>
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/usb.h>
  33 #include <linux/i2c.h>
  34 #include <linux/version.h>
  35 #include <linux/mm.h>
  36 #include <linux/video_decoder.h>
  37 #include <linux/mutex.h>
  38
  39 #include "em28xx.h"
  40 #include <media/v4l2-common.h>
  41 #include <media/msp3400.h>
  42
  43 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  44                       "Markus Rechberger <mrechberger@gmail.com>, " \
  45                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  46                       "Sascha Sommer <saschasommer@freenet.de>"
  47
  48 #define DRIVER_NAME         "em28xx"
  49 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  50 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
  51
  52 #define em28xx_videodbg(fmt, arg...) do {\
  53         if (video_debug) \
  54                 printk(KERN_INFO "%s %s :"fmt, \
  55                          dev->name, __FUNCTION__ , ##arg); } while (0)
  56
  57 MODULE_AUTHOR(DRIVER_AUTHOR);
  58 MODULE_DESCRIPTION(DRIVER_DESC);
  59 MODULE_LICENSE("GPL");
  60
  61 static LIST_HEAD(em28xx_devlist);
  62
  63 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  64 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  65 static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  66 module_param_array(card,  int, NULL, 0444);
  67 module_param_array(video_nr, int, NULL, 0444);
  68 module_param_array(vbi_nr, int, NULL, 0444);
  69 MODULE_PARM_DESC(card,"card type");
  70 MODULE_PARM_DESC(video_nr,"video device numbers");
  71 MODULE_PARM_DESC(vbi_nr,"vbi device numbers");
  72
  73 static unsigned int video_debug = 0;
  74 module_param(video_debug,int,0644);
  75 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  76
  77 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  78 static unsigned long em28xx_devused;
  79
  80 /* supported tv norms */
  81 static struct em28xx_tvnorm tvnorms[] = {
  82         {
  83                 .name = "PAL",
  84                 .id = V4L2_STD_PAL,
  85                 .mode = VIDEO_MODE_PAL,
  86          }, {
  87                 .name = "NTSC",
  88                 .id = V4L2_STD_NTSC,
  89                 .mode = VIDEO_MODE_NTSC,
  90         }, {
  91                  .name = "SECAM",
  92                  .id = V4L2_STD_SECAM,
  93                  .mode = VIDEO_MODE_SECAM,
  94         }, {
  95                 .name = "PAL-M",
  96                 .id = V4L2_STD_PAL_M,
  97                 .mode = VIDEO_MODE_PAL,
  98         }
  99 };
 100
 101 #define TVNORMS ARRAY_SIZE(tvnorms)
 102
 103 /* supported controls */
 104 /* Common to all boards */
 105 static struct v4l2_queryctrl em28xx_qctrl[] = {
 106         {
 107                 .id = V4L2_CID_AUDIO_VOLUME,
 108                 .type = V4L2_CTRL_TYPE_INTEGER,
 109                 .name = "Volume",
 110                 .minimum = 0x0,
 111                 .maximum = 0x1f,
 112                 .step = 0x1,
 113                 .default_value = 0x1f,
 114                 .flags = 0,
 115         },{
 116                 .id = V4L2_CID_AUDIO_MUTE,
 117                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 118                 .name = "Mute",
 119                 .minimum = 0,
 120                 .maximum = 1,
 121                 .step = 1,
 122                 .default_value = 1,
 123                 .flags = 0,
 124         }
 125 };
 126
 127 static struct usb_driver em28xx_usb_driver;
 128
 129
 130 /*********************  v4l2 interface  ******************************************/
 131
 132 /*
 133  * em28xx_config()
 134  * inits registers with sane defaults
 135  */
 136 static int em28xx_config(struct em28xx *dev)
 137 {
 138
 139         /* Sets I2C speed to 100 KHz */
 140         if (!dev->is_em2800)
 141                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 142
 143         /* enable vbi capturing */
 144
 145 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 146 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 147         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 148
 149         em28xx_audio_usb_mute(dev, 1);
 150         dev->mute = 1;          /* maybe not the right place... */
 151         dev->volume = 0x1f;
 152         em28xx_audio_analog_set(dev);
 153         em28xx_audio_analog_setup(dev);
 154         em28xx_outfmt_set_yuv422(dev);
 155         em28xx_colorlevels_set_default(dev);
 156         em28xx_compression_disable(dev);
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * em28xx_config_i2c()
 163  * configure i2c attached devices
 164  */
 165 static void em28xx_config_i2c(struct em28xx *dev)
 166 {
 167         struct v4l2_routing route;
 168
 169         route.input = INPUT(dev->ctl_input)->vmux;
 170         route.output = 0;
 171         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 172         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 173         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 174 }
 175
 176 /*
 177  * em28xx_empty_framequeues()
 178  * prepare queues for incoming and outgoing frames
 179  */
 180 static void em28xx_empty_framequeues(struct em28xx *dev)
 181 {
 182         u32 i;
 183
 184         INIT_LIST_HEAD(&dev->inqueue);
 185         INIT_LIST_HEAD(&dev->outqueue);
 186
 187         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 188                 dev->frame[i].state = F_UNUSED;
 189                 dev->frame[i].buf.bytesused = 0;
 190         }
 191 }
 192
 193 static void video_mux(struct em28xx *dev, int index)
 194 {
 195         int ainput;
 196         struct v4l2_routing route;
 197
 198         route.input = INPUT(index)->vmux;
 199         route.output = 0;
 200         dev->ctl_input = index;
 201         dev->ctl_ainput = INPUT(index)->amux;
 202
 203         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 204
 205         em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,route.input,dev->ctl_ainput);
 206
 207         if (dev->has_msp34xx) {
 208                 if (dev->i2s_speed)
 209                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 210                 route.input = dev->ctl_ainput;
 211                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 212                 /* Note: this is msp3400 specific */
 213                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 214                 ainput = EM28XX_AUDIO_SRC_TUNER;
 215                 em28xx_audio_source(dev, ainput);
 216         } else {
 217                 switch (dev->ctl_ainput) {
 218                         case 0:
 219                                 ainput = EM28XX_AUDIO_SRC_TUNER;
 220                                 break;
 221                         default:
 222                                 ainput = EM28XX_AUDIO_SRC_LINE;
 223                 }
 224                 em28xx_audio_source(dev, ainput);
 225         }
 226 }
 227
 228 /* Usage lock check functions */
 229 static int res_get(struct em28xx_fh *fh)
 230 {
 231         struct em28xx    *dev = fh->dev;
 232         int              rc   = 0;
 233
 234         /* This instance already has stream_on */
 235         if (fh->stream_on)
 236                 return rc;
 237
 238         mutex_lock(&dev->lock);
 239
 240         if (dev->stream_on)
 241                 rc = -EINVAL;
 242         else {
 243                 dev->stream_on = 1;
 244                 fh->stream_on  = 1;
 245         }
 246
 247         mutex_unlock(&dev->lock);
 248         return rc;
 249 }
 250
 251 static int res_check(struct em28xx_fh *fh)
 252 {
 253         return (fh->stream_on);
 254 }
 255
 256 static void res_free(struct em28xx_fh *fh)
 257 {
 258         struct em28xx    *dev = fh->dev;
 259
 260         mutex_lock(&dev->lock);
 261         fh->stream_on = 0;
 262         dev->stream_on = 0;
 263         mutex_unlock(&dev->lock);
 264 }
 265
 266 /*
 267  * em28xx_v4l2_open()
 268  * inits the device and starts isoc transfer
 269  */
 270 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 271 {
 272         int minor = iminor(inode);
 273         int errCode = 0;
 274         struct em28xx *h,*dev = NULL;
 275         struct em28xx_fh *fh;
 276
 277         list_for_each_entry(h, &em28xx_devlist, devlist) {
 278                 if (h->vdev->minor == minor) {
 279                         dev  = h;
 280                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 281                 }
 282                 if (h->vbi_dev->minor == minor) {
 283                         dev  = h;
 284                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 285                 }
 286         }
 287         if (NULL == dev)
 288                 return -ENODEV;
 289
 290         em28xx_videodbg("open minor=%d type=%s users=%d\n",
 291                                 minor,v4l2_type_names[dev->type],dev->users);
 292
 293         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
 294
 295         if (!fh) {
 296                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
 297                 return -ENOMEM;
 298         }
 299         mutex_lock(&dev->lock);
 300         fh->dev = dev;
 301         filp->private_data = fh;
 302
 303         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
 304                 em28xx_set_alternate(dev);
 305
 306                 dev->width = norm_maxw(dev);
 307                 dev->height = norm_maxh(dev);
 308                 dev->frame_size = dev->width * dev->height * 2;
 309                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 310                 dev->bytesperline = dev->width * 2;
 311                 dev->hscale = 0;
 312                 dev->vscale = 0;
 313
 314                 em28xx_capture_start(dev, 1);
 315                 em28xx_resolution_set(dev);
 316
 317
 318                 /* start the transfer */
 319                 errCode = em28xx_init_isoc(dev);
 320                 if (errCode)
 321                         goto err;
 322
 323                 em28xx_empty_framequeues(dev);
 324         }
 325
 326         dev->users++;
 327
 328 err:
 329         mutex_unlock(&dev->lock);
 330         return errCode;
 331 }
 332
 333 /*
 334  * em28xx_realease_resources()
 335  * unregisters the v4l2,i2c and usb devices
 336  * called when the device gets disconected or at module unload
 337 */
 338 static void em28xx_release_resources(struct em28xx *dev)
 339 {
 340
 341         /*FIXME: I2C IR should be disconnected */
 342
 343         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
 344                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
 345                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
 346         list_del(&dev->devlist);
 347         video_unregister_device(dev->vdev);
 348         video_unregister_device(dev->vbi_dev);
 349         em28xx_i2c_unregister(dev);
 350         usb_put_dev(dev->udev);
 351
 352
 353         /* Mark device as unused */
 354         em28xx_devused&=~(1<<dev->devno);
 355 }
 356
 357 /*
 358  * em28xx_v4l2_close()
 359  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 360  */
 361 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 362 {
 363         struct em28xx_fh *fh  = filp->private_data;
 364         struct em28xx    *dev = fh->dev;
 365         int              errCode;
 366
 367         em28xx_videodbg("users=%d\n", dev->users);
 368
 369
 370         if (res_check(fh))
 371                 res_free(fh);
 372
 373         mutex_lock(&dev->lock);
 374
 375         if (dev->users == 1) {
 376                 em28xx_uninit_isoc(dev);
 377                 em28xx_release_buffers(dev);
 378                 dev->io = IO_NONE;
 379
 380                 /* the device is already disconnect,
 381                    free the remaining resources */
 382                 if (dev->state & DEV_DISCONNECTED) {
 383                         em28xx_release_resources(dev);
 384                         mutex_unlock(&dev->lock);
 385                         kfree(dev);
 386                         return 0;
 387                 }
 388
 389                 /* set alternate 0 */
 390                 dev->alt = 0;
 391                 em28xx_videodbg("setting alternate 0\n");
 392                 errCode = usb_set_interface(dev->udev, 0, 0);
 393                 if (errCode < 0) {
 394                         em28xx_errdev("cannot change alternate number to "
 395                                         "0 (error=%i)\n", errCode);
 396                 }
 397         }
 398         kfree(fh);
 399         dev->users--;
 400         wake_up_interruptible_nr(&dev->open, 1);
 401         mutex_unlock(&dev->lock);
 402         return 0;
 403 }
 404
 405 /*
 406  * em28xx_v4l2_read()
 407  * will allocate buffers when called for the first time
 408  */
 409 static ssize_t
 410 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
 411                  loff_t * f_pos)
 412 {
 413         struct em28xx_frame_t *f, *i;
 414         unsigned long lock_flags;
 415         int ret = 0;
 416         struct em28xx_fh *fh = filp->private_data;
 417         struct em28xx *dev = fh->dev;
 418
 419
 420         if (unlikely(res_get(fh) < 0))
 421                 return -EBUSY;
 422
 423         mutex_lock(&dev->lock);
 424
 425         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 426                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
 427
 428         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 429                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
 430                 em28xx_videodbg("not supported yet! ...\n");
 431                 if (copy_to_user(buf, "", 1)) {
 432                         mutex_unlock(&dev->lock);
 433                         return -EFAULT;
 434                 }
 435                 mutex_unlock(&dev->lock);
 436                 return (1);
 437         }
 438         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 439                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
 440                 em28xx_videodbg("not supported yet! ...\n");
 441                 if (copy_to_user(buf, "", 1)) {
 442                         mutex_unlock(&dev->lock);
 443                         return -EFAULT;
 444                 }
 445                 mutex_unlock(&dev->lock);
 446                 return (1);
 447         }
 448
 449         if (dev->state & DEV_DISCONNECTED) {
 450                 em28xx_videodbg("device not present\n");
 451                 mutex_unlock(&dev->lock);
 452                 return -ENODEV;
 453         }
 454
 455         if (dev->state & DEV_MISCONFIGURED) {
 456                 em28xx_videodbg("device misconfigured; close and open it again\n");
 457                 mutex_unlock(&dev->lock);
 458                 return -EIO;
 459         }
 460
 461         if (dev->io == IO_MMAP) {
 462                 em28xx_videodbg ("IO method is set to mmap; close and open"
 463                                 " the device again to choose the read method\n");
 464                 mutex_unlock(&dev->lock);
 465                 return -EINVAL;
 466         }
 467
 468         if (dev->io == IO_NONE) {
 469                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
 470                         em28xx_errdev("read failed, not enough memory\n");
 471                         mutex_unlock(&dev->lock);
 472                         return -ENOMEM;
 473                 }
 474                 dev->io = IO_READ;
 475                 dev->stream = STREAM_ON;
 476                 em28xx_queue_unusedframes(dev);
 477         }
 478
 479         if (!count) {
 480                 mutex_unlock(&dev->lock);
 481                 return 0;
 482         }
 483
 484         if (list_empty(&dev->outqueue)) {
 485                 if (filp->f_flags & O_NONBLOCK) {
 486                         mutex_unlock(&dev->lock);
 487                         return -EAGAIN;
 488                 }
 489                 ret = wait_event_interruptible
 490                     (dev->wait_frame,
 491                      (!list_empty(&dev->outqueue)) ||
 492                      (dev->state & DEV_DISCONNECTED));
 493                 if (ret) {
 494                         mutex_unlock(&dev->lock);
 495                         return ret;
 496                 }
 497                 if (dev->state & DEV_DISCONNECTED) {
 498                         mutex_unlock(&dev->lock);
 499                         return -ENODEV;
 500                 }
 501         }
 502
 503         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
 504
 505         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 506         list_for_each_entry(i, &dev->outqueue, frame)
 507             i->state = F_UNUSED;
 508         INIT_LIST_HEAD(&dev->outqueue);
 509         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 510
 511         em28xx_queue_unusedframes(dev);
 512
 513         if (count > f->buf.length)
 514                 count = f->buf.length;
 515
 516         if (copy_to_user(buf, f->bufmem, count)) {
 517                 mutex_unlock(&dev->lock);
 518                 return -EFAULT;
 519         }
 520         *f_pos += count;
 521
 522         mutex_unlock(&dev->lock);
 523
 524         return count;
 525 }
 526
 527 /*
 528  * em28xx_v4l2_poll()
 529  * will allocate buffers when called for the first time
 530  */
 531 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
 532 {
 533         unsigned int mask = 0;
 534         struct em28xx_fh *fh = filp->private_data;
 535         struct em28xx *dev = fh->dev;
 536
 537         if (unlikely(res_get(fh) < 0))
 538                 return POLLERR;
 539
 540         mutex_lock(&dev->lock);
 541
 542         if (dev->state & DEV_DISCONNECTED) {
 543                 em28xx_videodbg("device not present\n");
 544         } else if (dev->state & DEV_MISCONFIGURED) {
 545                 em28xx_videodbg("device is misconfigured; close and open it again\n");
 546         } else {
 547                 if (dev->io == IO_NONE) {
 548                         if (!em28xx_request_buffers
 549                             (dev, EM28XX_NUM_READ_FRAMES)) {
 550                                 em28xx_warn
 551                                     ("poll() failed, not enough memory\n");
 552                         } else {
 553                                 dev->io = IO_READ;
 554                                 dev->stream = STREAM_ON;
 555                         }
 556                 }
 557
 558                 if (dev->io == IO_READ) {
 559                         em28xx_queue_unusedframes(dev);
 560                         poll_wait(filp, &dev->wait_frame, wait);
 561
 562                         if (!list_empty(&dev->outqueue))
 563                                 mask |= POLLIN | POLLRDNORM;
 564
 565                         mutex_unlock(&dev->lock);
 566
 567                         return mask;
 568                 }
 569         }
 570
 571         mutex_unlock(&dev->lock);
 572         return POLLERR;
 573 }
 574
 575 /*
 576  * em28xx_vm_open()
 577  */
 578 static void em28xx_vm_open(struct vm_area_struct *vma)
 579 {
 580         struct em28xx_frame_t *f = vma->vm_private_data;
 581         f->vma_use_count++;
 582 }
 583
 584 /*
 585  * em28xx_vm_close()
 586  */
 587 static void em28xx_vm_close(struct vm_area_struct *vma)
 588 {
 589         /* NOTE: buffers are not freed here */
 590         struct em28xx_frame_t *f = vma->vm_private_data;
 591
 592         if (f->vma_use_count)
 593                 f->vma_use_count--;
 594 }
 595
 596 static struct vm_operations_struct em28xx_vm_ops = {
 597         .open = em28xx_vm_open,
 598         .close = em28xx_vm_close,
 599 };
 600
 601 /*
 602  * em28xx_v4l2_mmap()
 603  */
 604 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 605 {
 606         struct em28xx_fh *fh    = filp->private_data;
 607         struct em28xx    *dev   = fh->dev;
 608         unsigned long    size   = vma->vm_end - vma->vm_start;
 609         unsigned long    start  = vma->vm_start;
 610         void             *pos;
 611         u32              i;
 612
 613         if (unlikely(res_get(fh) < 0))
 614                 return -EBUSY;
 615
 616         mutex_lock(&dev->lock);
 617
 618         if (dev->state & DEV_DISCONNECTED) {
 619                 em28xx_videodbg("mmap: device not present\n");
 620                 mutex_unlock(&dev->lock);
 621                 return -ENODEV;
 622         }
 623
 624         if (dev->state & DEV_MISCONFIGURED) {
 625                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
 626                                                 "open it again\n");
 627                 mutex_unlock(&dev->lock);
 628                 return -EIO;
 629         }
 630
 631         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
 632             size != PAGE_ALIGN(dev->frame[0].buf.length)) {
 633                 mutex_unlock(&dev->lock);
 634                 return -EINVAL;
 635         }
 636
 637         for (i = 0; i < dev->num_frames; i++) {
 638                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
 639                         break;
 640         }
 641         if (i == dev->num_frames) {
 642                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
 643                 mutex_unlock(&dev->lock);
 644                 return -EINVAL;
 645         }
 646
 647         /* VM_IO is eventually going to replace PageReserved altogether */
 648         vma->vm_flags |= VM_IO;
 649         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
 650
 651         pos = dev->frame[i].bufmem;
 652         while (size > 0) {      /* size is page-aligned */
 653                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
 654                         em28xx_videodbg("mmap: vm_insert_page failed\n");
 655                         mutex_unlock(&dev->lock);
 656                         return -EAGAIN;
 657                 }
 658                 start += PAGE_SIZE;
 659                 pos += PAGE_SIZE;
 660                 size -= PAGE_SIZE;
 661         }
 662
 663         vma->vm_ops = &em28xx_vm_ops;
 664         vma->vm_private_data = &dev->frame[i];
 665
 666         em28xx_vm_open(vma);
 667         mutex_unlock(&dev->lock);
 668         return 0;
 669 }
 670
 671 /*
 672  * em28xx_get_ctrl()
 673  * return the current saturation, brightness or contrast, mute state
 674  */
 675 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 676 {
 677         switch (ctrl->id) {
 678         case V4L2_CID_AUDIO_MUTE:
 679                 ctrl->value = dev->mute;
 680                 return 0;
 681         case V4L2_CID_AUDIO_VOLUME:
 682                 ctrl->value = dev->volume;
 683                 return 0;
 684         default:
 685                 return -EINVAL;
 686         }
 687 }
 688
 689 /*
 690  * em28xx_set_ctrl()
 691  * mute or set new saturation, brightness or contrast
 692  */
 693 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 694 {
 695         switch (ctrl->id) {
 696         case V4L2_CID_AUDIO_MUTE:
 697                 if (ctrl->value != dev->mute) {
 698                         dev->mute = ctrl->value;
 699                         em28xx_audio_usb_mute(dev, ctrl->value);
 700                         return em28xx_audio_analog_set(dev);
 701                 }
 702                 return 0;
 703         case V4L2_CID_AUDIO_VOLUME:
 704                 dev->volume = ctrl->value;
 705                 return em28xx_audio_analog_set(dev);
 706         default:
 707                 return -EINVAL;
 708         }
 709 }
 710
 711 /*
 712  * em28xx_stream_interrupt()
 713  * stops streaming
 714  */
 715 static int em28xx_stream_interrupt(struct em28xx *dev)
 716 {
 717         int ret = 0;
 718
 719         /* stop reading from the device */
 720
 721         dev->stream = STREAM_INTERRUPT;
 722         ret = wait_event_timeout(dev->wait_stream,
 723                                  (dev->stream == STREAM_OFF) ||
 724                                  (dev->state & DEV_DISCONNECTED),
 725                                  EM28XX_URB_TIMEOUT);
 726         if (dev->state & DEV_DISCONNECTED)
 727                 return -ENODEV;
 728         else if (ret) {
 729                 dev->state |= DEV_MISCONFIGURED;
 730                 em28xx_videodbg("device is misconfigured; close and "
 731                         "open /dev/video%d again\n",
 732                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 733                 return ret;
 734         }
 735
 736         return 0;
 737 }
 738
 739 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
 740 {
 741         unsigned int hscale, vscale;
 742         unsigned int maxh, maxw;
 743
 744         maxw = norm_maxw(dev);
 745         maxh = norm_maxh(dev);
 746
 747         /* width must even because of the YUYV format */
 748         /* height must be even because of interlacing */
 749         height &= 0xfffe;
 750         width &= 0xfffe;
 751
 752         if (height < 32)
 753                 height = 32;
 754         if (height > maxh)
 755                 height = maxh;
 756         if (width < 48)
 757                 width = 48;
 758         if (width > maxw)
 759                 width = maxw;
 760
 761         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 762                 hscale = 0x3fff;
 763         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 764
 765         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 766                 vscale = 0x3fff;
 767         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 768
 769         /* set new image size */
 770         dev->width = width;
 771         dev->height = height;
 772         dev->frame_size = dev->width * dev->height * 2;
 773         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 774         dev->bytesperline = dev->width * 2;
 775         dev->hscale = hscale;
 776         dev->vscale = vscale;
 777
 778         em28xx_resolution_set(dev);
 779
 780         return 0;
 781 }
 782
 783 static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
 784 {
 785         em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
 786                 (format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
 787                 "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 788                 (format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
 789                 "V4L2_BUF_TYPE_VBI_CAPTURE" :
 790                 (format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
 791                 "V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
 792                 "not supported");
 793
 794         switch (format->type) {
 795         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 796         {
 797                 format->fmt.pix.width = dev->width;
 798                 format->fmt.pix.height = dev->height;
 799                 format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 800                 format->fmt.pix.bytesperline = dev->bytesperline;
 801                 format->fmt.pix.sizeimage = dev->frame_size;
 802                 format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 803                 format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 804
 805                 em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
 806                         dev->height);
 807                 break;
 808         }
 809
 810         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 811         {
 812                 format->fmt.sliced.service_set=0;
 813
 814                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 815
 816                 if (format->fmt.sliced.service_set==0)
 817                         return -EINVAL;
 818
 819                 break;
 820         }
 821
 822         default:
 823                 return -EINVAL;
 824         }
 825         return (0);
 826 }
 827
 828 static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
 829 {
 830         u32 i;
 831         int ret = 0;
 832         int width = format->fmt.pix.width;
 833         int height = format->fmt.pix.height;
 834         unsigned int hscale, vscale;
 835         unsigned int maxh, maxw;
 836
 837         maxw = norm_maxw(dev);
 838         maxh = norm_maxh(dev);
 839
 840         em28xx_videodbg("%s: type=%s\n",
 841                         cmd == VIDIOC_TRY_FMT ?
 842                         "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 843                         format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
 844                         "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 845                         format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
 846                         "V4L2_BUF_TYPE_VBI_CAPTURE " :
 847                         "not supported");
 848
 849         if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 850                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 851
 852                 if (format->fmt.sliced.service_set==0)
 853                         return -EINVAL;
 854
 855                 return 0;
 856         }
 857
 858
 859         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 860                 return -EINVAL;
 861
 862         em28xx_videodbg("%s: requested %dx%d\n",
 863                 cmd == VIDIOC_TRY_FMT ?
 864                 "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 865                 format->fmt.pix.width, format->fmt.pix.height);
 866
 867         /* FIXME: Move some code away from here */
 868         /* width must even because of the YUYV format */
 869         /* height must be even because of interlacing */
 870         height &= 0xfffe;
 871         width &= 0xfffe;
 872
 873         if (height < 32)
 874                 height = 32;
 875         if (height > maxh)
 876                 height = maxh;
 877         if (width < 48)
 878                 width = 48;
 879         if (width > maxw)
 880                 width = maxw;
 881
 882         if(dev->is_em2800){
 883                 /* the em2800 can only scale down to 50% */
 884                 if(height % (maxh / 2))
 885                         height=maxh;
 886                 if(width % (maxw / 2))
 887                         width=maxw;
 888                 /* according to empiatech support */
 889                 /* the MaxPacketSize is to small to support */
 890                 /* framesizes larger than 640x480 @ 30 fps */
 891                 /* or 640x576 @ 25 fps. As this would cut */
 892                 /* of a part of the image we prefer */
 893                 /* 360x576 or 360x480 for now */
 894                 if(width == maxw && height == maxh)
 895                         width /= 2;
 896         }
 897
 898         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 899                 hscale = 0x3fff;
 900
 901         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 902
 903         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 904                 vscale = 0x3fff;
 905
 906         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 907
 908         format->fmt.pix.width = width;
 909         format->fmt.pix.height = height;
 910         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 911         format->fmt.pix.bytesperline = width * 2;
 912         format->fmt.pix.sizeimage = width * 2 * height;
 913         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 914         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
 915
 916         em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
 917                 cmd == VIDIOC_TRY_FMT ?
 918                 "VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
 919                 format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);
 920
 921         if (cmd == VIDIOC_TRY_FMT)
 922                 return 0;
 923
 924         for (i = 0; i < dev->num_frames; i++)
 925                 if (dev->frame[i].vma_use_count) {
 926                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 927                                 "Unmap the buffers first.\n");
 928                         return -EINVAL;
 929                 }
 930
 931         /* stop io in case it is already in progress */
 932         if (dev->stream == STREAM_ON) {
 933                 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
 934                 if ((ret = em28xx_stream_interrupt(dev)))
 935                         return ret;
 936         }
 937
 938         em28xx_release_buffers(dev);
 939         dev->io = IO_NONE;
 940
 941         /* set new image size */
 942         dev->width = width;
 943         dev->height = height;
 944         dev->frame_size = dev->width * dev->height * 2;
 945         dev->field_size = dev->frame_size >> 1;
 946         dev->bytesperline = dev->width * 2;
 947         dev->hscale = hscale;
 948         dev->vscale = vscale;
 949         em28xx_uninit_isoc(dev);
 950         em28xx_set_alternate(dev);
 951         em28xx_capture_start(dev, 1);
 952         em28xx_resolution_set(dev);
 953         em28xx_init_isoc(dev);
 954
 955         return 0;
 956 }
 957
 958 /*
 959  * em28xx_v4l2_do_ioctl()
 960  * This function is _not_ called directly, but from
 961  * em28xx_v4l2_ioctl. Userspace
 962  * copying is done already, arg is a kernel pointer.
 963  */
 964 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
 965                            struct em28xx *dev, unsigned int cmd, void *arg,
 966                            v4l2_kioctl driver_ioctl)
 967 {
 968         struct em28xx_fh *fh = filp->private_data;
 969         int ret;
 970
 971         switch (cmd) {
 972                 /* ---------- tv norms ---------- */
 973         case VIDIOC_ENUMSTD:
 974         {
 975                 struct v4l2_standard *e = arg;
 976                 unsigned int i;
 977
 978                 i = e->index;
 979                 if (i >= TVNORMS)
 980                         return -EINVAL;
 981                 ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 982                                                 tvnorms[e->index].name);
 983                 e->index = i;
 984                 if (ret < 0)
 985                         return ret;
 986                 return 0;
 987         }
 988         case VIDIOC_G_STD:
 989         {
 990                 v4l2_std_id *id = arg;
 991
 992                 *id = dev->tvnorm->id;
 993                 return 0;
 994         }
 995         case VIDIOC_S_STD:
 996         {
 997                 v4l2_std_id *id = arg;
 998                 unsigned int i;
 999
1000                 for (i = 0; i < TVNORMS; i++)
1001                         if (*id == tvnorms[i].id)
1002                                 break;
1003                 if (i == TVNORMS)
1004                         for (i = 0; i < TVNORMS; i++)
1005                                 if (*id & tvnorms[i].id)
1006                                         break;
1007                 if (i == TVNORMS)
1008                         return -EINVAL;
1009
1010                 mutex_lock(&dev->lock);
1011                 dev->tvnorm = &tvnorms[i];
1012
1013                 em28xx_set_norm(dev, dev->width, dev->height);
1014
1015                 em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
1016                                         &dev->tvnorm->id);
1017
1018                 mutex_unlock(&dev->lock);
1019
1020                 return 0;
1021         }
1022
1023         /* ------ input switching ---------- */
1024         case VIDIOC_ENUMINPUT:
1025         {
1026                 struct v4l2_input *i = arg;
1027                 unsigned int n;
1028                 static const char *iname[] = {
1029                         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
1030                         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
1031                         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
1032                         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
1033                         [EM28XX_VMUX_SVIDEO] = "S-Video",
1034                         [EM28XX_VMUX_TELEVISION] = "Television",
1035                         [EM28XX_VMUX_CABLE] = "Cable TV",
1036                         [EM28XX_VMUX_DVB] = "DVB",
1037                         [EM28XX_VMUX_DEBUG] = "for debug only",
1038                 };
1039
1040                 n = i->index;
1041                 if (n >= MAX_EM28XX_INPUT)
1042                         return -EINVAL;
1043                 if (0 == INPUT(n)->type)
1044                         return -EINVAL;
1045                 memset(i, 0, sizeof(*i));
1046                 i->index = n;
1047                 i->type = V4L2_INPUT_TYPE_CAMERA;
1048                 strcpy(i->name, iname[INPUT(n)->type]);
1049                 if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
1050                         (EM28XX_VMUX_CABLE == INPUT(n)->type))
1051                         i->type = V4L2_INPUT_TYPE_TUNER;
1052                 for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
1053                         i->std |= tvnorms[n].id;
1054                 return 0;
1055         }
1056         case VIDIOC_G_INPUT:
1057         {
1058                 int *i = arg;
1059                 *i = dev->ctl_input;
1060
1061                 return 0;
1062         }
1063         case VIDIOC_S_INPUT:
1064         {
1065                 int *index = arg;
1066
1067                 if (*index >= MAX_EM28XX_INPUT)
1068                         return -EINVAL;
1069                 if (0 == INPUT(*index)->type)
1070                         return -EINVAL;
1071
1072                 mutex_lock(&dev->lock);
1073                 video_mux(dev, *index);
1074                 mutex_unlock(&dev->lock);
1075
1076                 return 0;
1077         }
1078         case VIDIOC_G_AUDIO:
1079         {
1080                 struct v4l2_audio *a = arg;
1081                 unsigned int index = a->index;
1082
1083                 if (a->index > 1)
1084                         return -EINVAL;
1085                 memset(a, 0, sizeof(*a));
1086                 index = dev->ctl_ainput;
1087
1088                 if (index == 0) {
1089                         strcpy(a->name, "Television");
1090                 } else {
1091                         strcpy(a->name, "Line In");
1092                 }
1093                 a->capability = V4L2_AUDCAP_STEREO;
1094                 a->index = index;
1095                 return 0;
1096         }
1097         case VIDIOC_S_AUDIO:
1098         {
1099                 struct v4l2_audio *a = arg;
1100
1101                 if (a->index != dev->ctl_ainput)
1102                         return -EINVAL;
1103
1104                 return 0;
1105         }
1106
1107         /* --- controls ---------------------------------------------- */
1108         case VIDIOC_QUERYCTRL:
1109         {
1110                 struct v4l2_queryctrl *qc = arg;
1111                 int i, id=qc->id;
1112
1113                 memset(qc,0,sizeof(*qc));
1114                 qc->id=id;
1115
1116                 if (!dev->has_msp34xx) {
1117                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1118                                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1119                                         memcpy(qc, &(em28xx_qctrl[i]),
1120                                         sizeof(*qc));
1121                                         return 0;
1122                                 }
1123                         }
1124                 }
1125                 mutex_lock(&dev->lock);
1126                 em28xx_i2c_call_clients(dev,cmd,qc);
1127                 mutex_unlock(&dev->lock);
1128                 if (qc->type)
1129                         return 0;
1130                 else
1131                         return -EINVAL;
1132         }
1133         case VIDIOC_G_CTRL:
1134         {
1135                 struct v4l2_control *ctrl = arg;
1136                 int retval=-EINVAL;
1137
1138                 if (!dev->has_msp34xx)
1139                         retval=em28xx_get_ctrl(dev, ctrl);
1140                 if (retval==-EINVAL) {
1141                         mutex_lock(&dev->lock);
1142                         em28xx_i2c_call_clients(dev,cmd,arg);
1143                         mutex_unlock(&dev->lock);
1144                         return 0;
1145                 } else return retval;
1146         }
1147         case VIDIOC_S_CTRL:
1148         {
1149                 struct v4l2_control *ctrl = arg;
1150                 u8 i;
1151                 mutex_lock(&dev->lock);
1152
1153                 if (!dev->has_msp34xx){
1154                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1155                                 if (ctrl->id == em28xx_qctrl[i].id) {
1156                                         int retval=-EINVAL;
1157                                         if (ctrl->value <
1158                                         em28xx_qctrl[i].minimum
1159                                         || ctrl->value >
1160                                         em28xx_qctrl[i].maximum)
1161                                                 return -ERANGE;
1162                                         retval = em28xx_set_ctrl(dev, ctrl);
1163                                         mutex_unlock(&dev->lock);
1164                                         return retval;
1165                                 }
1166                         }
1167                 }
1168
1169                 em28xx_i2c_call_clients(dev,cmd,arg);
1170                 mutex_unlock(&dev->lock);
1171                 return 0;
1172         }
1173         /* --- tuner ioctls ------------------------------------------ */
1174         case VIDIOC_G_TUNER:
1175         {
1176                 struct v4l2_tuner *t = arg;
1177
1178                 if (0 != t->index)
1179                         return -EINVAL;
1180
1181                 memset(t, 0, sizeof(*t));
1182                 strcpy(t->name, "Tuner");
1183                 mutex_lock(&dev->lock);
1184                 /* let clients fill in the remainder of this struct */
1185                 em28xx_i2c_call_clients(dev, cmd, t);
1186                 mutex_unlock(&dev->lock);
1187                 em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
1188                                 t->afc);
1189                 return 0;
1190         }
1191         case VIDIOC_S_TUNER:
1192         {
1193                 struct v4l2_tuner *t = arg;
1194
1195                 if (0 != t->index)
1196                         return -EINVAL;
1197                 mutex_lock(&dev->lock);
1198                 /* let clients handle this */
1199                 em28xx_i2c_call_clients(dev, cmd, t);
1200                 mutex_unlock(&dev->lock);
1201                 return 0;
1202         }
1203         case VIDIOC_G_FREQUENCY:
1204         {
1205                 struct v4l2_frequency *f = arg;
1206
1207                 memset(f, 0, sizeof(*f));
1208                 f->type = V4L2_TUNER_ANALOG_TV;
1209                 f->frequency = dev->ctl_freq;
1210
1211                 return 0;
1212         }
1213         case VIDIOC_S_FREQUENCY:
1214         {
1215                 struct v4l2_frequency *f = arg;
1216
1217                 if (0 != f->tuner)
1218                         return -EINVAL;
1219
1220                 if (V4L2_TUNER_ANALOG_TV != f->type)
1221                         return -EINVAL;
1222
1223                 mutex_lock(&dev->lock);
1224                 dev->ctl_freq = f->frequency;
1225                 em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1226                 mutex_unlock(&dev->lock);
1227                 return 0;
1228         }
1229         case VIDIOC_CROPCAP:
1230         {
1231                 struct v4l2_cropcap *cc = arg;
1232
1233                 if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1234                         return -EINVAL;
1235                 cc->bounds.left = 0;
1236                 cc->bounds.top = 0;
1237                 cc->bounds.width = dev->width;
1238                 cc->bounds.height = dev->height;
1239                 cc->defrect = cc->bounds;
1240                 cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1241                 cc->pixelaspect.denominator = 59;
1242                 return 0;
1243         }
1244         case VIDIOC_STREAMON:
1245         {
1246                 int *type = arg;
1247
1248                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1249                         || dev->io != IO_MMAP)
1250                         return -EINVAL;
1251
1252                 if (list_empty(&dev->inqueue))
1253                         return -EINVAL;
1254
1255                 if (unlikely(res_get(fh) < 0))
1256                         return -EBUSY;
1257
1258                 dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1259
1260                 em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");
1261
1262                 return 0;
1263         }
1264         case VIDIOC_STREAMOFF:
1265         {
1266                 int *type = arg;
1267                 int ret;
1268
1269                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1270                         || dev->io != IO_MMAP)
1271                         return -EINVAL;
1272
1273                 mutex_lock(&dev->lock);
1274                 if (dev->stream == STREAM_ON) {
1275                         em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
1276                         if ((ret = em28xx_stream_interrupt(dev))){
1277                                 mutex_unlock(&dev->lock);
1278                                 return ret;
1279                         }
1280                 }
1281
1282                 em28xx_empty_framequeues(dev);
1283                 mutex_unlock(&dev->lock);
1284
1285                 return 0;
1286         }
1287         default:
1288                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1289                                                   driver_ioctl);
1290         }
1291         return 0;
1292 }
1293
1294 /*
1295  * em28xx_v4l2_do_ioctl()
1296  * This function is _not_ called directly, but from
1297  * em28xx_v4l2_ioctl. Userspace
1298  * copying is done already, arg is a kernel pointer.
1299  */
1300 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1301                                  unsigned int cmd, void *arg)
1302 {
1303         struct em28xx_fh *fh = filp->private_data;
1304         struct em28xx *dev   = fh->dev;
1305
1306         if (!dev)
1307                 return -ENODEV;
1308
1309         if (video_debug > 1)
1310                 v4l_print_ioctl(dev->name,cmd);
1311
1312         switch (cmd) {
1313
1314                 /* --- capabilities ------------------------------------------ */
1315         case VIDIOC_QUERYCAP:
1316                 {
1317                 struct v4l2_capability *cap = arg;
1318
1319                 memset(cap, 0, sizeof(*cap));
1320                 strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1321                 strlcpy(cap->card, em28xx_boards[dev->model].name,
1322                         sizeof(cap->card));
1323                 strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1324                         sizeof(cap->bus_info));
1325                 cap->version = EM28XX_VERSION_CODE;
1326                 cap->capabilities =
1327                                 V4L2_CAP_SLICED_VBI_CAPTURE |
1328                                 V4L2_CAP_VIDEO_CAPTURE |
1329                                 V4L2_CAP_AUDIO |
1330                                 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1331                 if (dev->has_tuner)
1332                         cap->capabilities |= V4L2_CAP_TUNER;
1333                 return 0;
1334         }
1335         /* --- capture ioctls ---------------------------------------- */
1336         case VIDIOC_ENUM_FMT:
1337         {
1338                 struct v4l2_fmtdesc *fmtd = arg;
1339
1340                 if (fmtd->index != 0)
1341                         return -EINVAL;
1342                 memset(fmtd, 0, sizeof(*fmtd));
1343                 fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1344                 strcpy(fmtd->description, "Packed YUY2");
1345                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1346                 memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1347                 return 0;
1348         }
1349         case VIDIOC_G_FMT:
1350         {
1351                 int retval;
1352                 mutex_lock(&dev->lock);
1353                 retval = em28xx_get_fmt(dev, (struct v4l2_format *) arg);
1354                 mutex_unlock(&dev->lock);
1355                 return retval;
1356
1357         }
1358         case VIDIOC_TRY_FMT:
1359         case VIDIOC_S_FMT:
1360         {
1361                 int retval;
1362                 mutex_lock(&dev->lock);
1363                 retval = em28xx_set_fmt(dev, cmd, (struct v4l2_format *)arg);
1364                 mutex_unlock(&dev->lock);
1365                 return retval;
1366         }
1367
1368         case VIDIOC_REQBUFS:
1369         {
1370                 struct v4l2_requestbuffers *rb = arg;
1371                 u32 i;
1372                 int ret;
1373
1374                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1375                         rb->memory != V4L2_MEMORY_MMAP)
1376                         return -EINVAL;
1377
1378                 if (dev->io == IO_READ) {
1379                         em28xx_videodbg ("method is set to read;"
1380                                 " close and open the device again to"
1381                                 " choose the mmap I/O method\n");
1382                         return -EINVAL;
1383                 }
1384
1385                 for (i = 0; i < dev->num_frames; i++)
1386                         if (dev->frame[i].vma_use_count) {
1387                                 em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
1388                                 return -EINVAL;
1389                         }
1390
1391                 mutex_lock(&dev->lock);
1392                 if (dev->stream == STREAM_ON) {
1393                         em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1394                         if ((ret = em28xx_stream_interrupt(dev))){
1395                                 mutex_unlock(&dev->lock);
1396                                 return ret;
1397                         }
1398                 }
1399
1400                 em28xx_empty_framequeues(dev);
1401
1402                 em28xx_release_buffers(dev);
1403                 if (rb->count)
1404                         rb->count =
1405                                 em28xx_request_buffers(dev, rb->count);
1406
1407                 dev->frame_current = NULL;
1408
1409                 em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
1410                                                 rb->count);
1411                 dev->io = rb->count ? IO_MMAP : IO_NONE;
1412                 mutex_unlock(&dev->lock);
1413                 return 0;
1414         }
1415         case VIDIOC_QUERYBUF:
1416         {
1417                 struct v4l2_buffer *b = arg;
1418
1419                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1420                         b->index >= dev->num_frames || dev->io != IO_MMAP)
1421                         return -EINVAL;
1422
1423                 memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1424
1425                 if (dev->frame[b->index].vma_use_count) {
1426                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1427                 }
1428                 if (dev->frame[b->index].state == F_DONE)
1429                         b->flags |= V4L2_BUF_FLAG_DONE;
1430                 else if (dev->frame[b->index].state != F_UNUSED)
1431                         b->flags |= V4L2_BUF_FLAG_QUEUED;
1432                 return 0;
1433         }
1434         case VIDIOC_QBUF:
1435         {
1436                 struct v4l2_buffer *b = arg;
1437                 unsigned long lock_flags;
1438
1439                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1440                         b->index >= dev->num_frames || dev->io != IO_MMAP) {
1441                         return -EINVAL;
1442                 }
1443
1444                 if (dev->frame[b->index].state != F_UNUSED) {
1445                         return -EAGAIN;
1446                 }
1447                 dev->frame[b->index].state = F_QUEUED;
1448
1449                 /* add frame to fifo */
1450                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1451                 list_add_tail(&dev->frame[b->index].frame,
1452                                 &dev->inqueue);
1453                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1454
1455                 return 0;
1456         }
1457         case VIDIOC_DQBUF:
1458         {
1459                 struct v4l2_buffer *b = arg;
1460                 struct em28xx_frame_t *f;
1461                 unsigned long lock_flags;
1462                 int ret = 0;
1463
1464                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1465                         || dev->io != IO_MMAP)
1466                         return -EINVAL;
1467
1468                 if (list_empty(&dev->outqueue)) {
1469                         if (dev->stream == STREAM_OFF)
1470                                 return -EINVAL;
1471                         if (filp->f_flags & O_NONBLOCK)
1472                                 return -EAGAIN;
1473                         ret = wait_event_interruptible
1474                                 (dev->wait_frame,
1475                                 (!list_empty(&dev->outqueue)) ||
1476                                 (dev->state & DEV_DISCONNECTED));
1477                         if (ret)
1478                                 return ret;
1479                         if (dev->state & DEV_DISCONNECTED)
1480                                 return -ENODEV;
1481                 }
1482
1483                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1484                 f = list_entry(dev->outqueue.next,
1485                                 struct em28xx_frame_t, frame);
1486                 list_del(dev->outqueue.next);
1487                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1488
1489                 f->state = F_UNUSED;
1490                 memcpy(b, &f->buf, sizeof(*b));
1491
1492                 if (f->vma_use_count)
1493                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1494
1495                 return 0;
1496         }
1497         default:
1498                 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1499                                        em28xx_video_do_ioctl);
1500         }
1501         return 0;
1502 }
1503
1504 /*
1505  * em28xx_v4l2_ioctl()
1506  * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1507  */
1508 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1509                              unsigned int cmd, unsigned long arg)
1510 {
1511         int ret = 0;
1512         struct em28xx_fh *fh = filp->private_data;
1513         struct em28xx *dev   = fh->dev;
1514
1515         if (dev->state & DEV_DISCONNECTED) {
1516                 em28xx_errdev("v4l2 ioctl: device not present\n");
1517                 return -ENODEV;
1518         }
1519
1520         if (dev->state & DEV_MISCONFIGURED) {
1521                 em28xx_errdev
1522                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1523                 return -EIO;
1524         }
1525
1526         ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1527
1528         return ret;
1529 }
1530
1531 static const struct file_operations em28xx_v4l_fops = {
1532         .owner = THIS_MODULE,
1533         .open = em28xx_v4l2_open,
1534         .release = em28xx_v4l2_close,
1535         .ioctl = em28xx_v4l2_ioctl,
1536         .read = em28xx_v4l2_read,
1537         .poll = em28xx_v4l2_poll,
1538         .mmap = em28xx_v4l2_mmap,
1539         .llseek = no_llseek,
1540         .compat_ioctl   = v4l_compat_ioctl32,
1541
1542 };
1543
1544 /******************************** usb interface *****************************************/
1545
1546 /*
1547  * em28xx_init_dev()
1548  * allocates and inits the device structs, registers i2c bus and v4l device
1549  */
1550 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1551                            int minor)
1552 {
1553         struct em28xx *dev = *devhandle;
1554         int retval = -ENOMEM;
1555         int errCode, i;
1556         unsigned int maxh, maxw;
1557
1558         dev->udev = udev;
1559         mutex_init(&dev->lock);
1560         spin_lock_init(&dev->queue_lock);
1561         init_waitqueue_head(&dev->open);
1562         init_waitqueue_head(&dev->wait_frame);
1563         init_waitqueue_head(&dev->wait_stream);
1564
1565         dev->em28xx_write_regs = em28xx_write_regs;
1566         dev->em28xx_read_reg = em28xx_read_reg;
1567         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1568         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1569         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1570         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1571
1572         /* setup video picture settings for saa7113h */
1573         memset(&dev->vpic, 0, sizeof(dev->vpic));
1574         dev->vpic.colour = 128 << 8;
1575         dev->vpic.hue = 128 << 8;
1576         dev->vpic.brightness = 128 << 8;
1577         dev->vpic.contrast = 192 << 8;
1578         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1579         dev->vpic.depth = 16;
1580         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1581
1582         em28xx_pre_card_setup(dev);
1583
1584         errCode = em28xx_config(dev);
1585         if (errCode) {
1586                 em28xx_errdev("error configuring device\n");
1587                 em28xx_devused &= ~(1<<dev->devno);
1588                 kfree(dev);
1589                 return -ENOMEM;
1590         }
1591
1592         /* register i2c bus */
1593         em28xx_i2c_register(dev);
1594
1595         /* Do board specific init and eeprom reading */
1596         em28xx_card_setup(dev);
1597
1598         /* configure the device */
1599         em28xx_config_i2c(dev);
1600
1601         for (i = 0; i < TVNORMS; i++)
1602                 if (em28xx_boards[dev->model].norm == tvnorms[i].mode)
1603                         break;
1604         if (i == TVNORMS)
1605                 i = 0;
1606
1607         dev->tvnorm = &tvnorms[i];      /* set default norm */
1608
1609         em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1610
1611         maxw = norm_maxw(dev);
1612         maxh = norm_maxh(dev);
1613
1614         /* set default image size */
1615         dev->width = maxw;
1616         dev->height = maxh;
1617         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1618         dev->field_size = dev->width * dev->height;
1619         dev->frame_size =
1620             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1621         dev->bytesperline = dev->width * 2;
1622         dev->hscale = 0;
1623         dev->vscale = 0;
1624         dev->ctl_input = 2;
1625
1626         errCode = em28xx_config(dev);
1627
1628         /* allocate and fill v4l2 device struct */
1629         dev->vdev = video_device_alloc();
1630         if (NULL == dev->vdev) {
1631                 em28xx_errdev("cannot allocate video_device.\n");
1632                 em28xx_devused&=~(1<<dev->devno);
1633                 kfree(dev);
1634                 return -ENOMEM;
1635         }
1636
1637         dev->vbi_dev = video_device_alloc();
1638         if (NULL == dev->vbi_dev) {
1639                 em28xx_errdev("cannot allocate video_device.\n");
1640                 kfree(dev->vdev);
1641                 em28xx_devused&=~(1<<dev->devno);
1642                 kfree(dev);
1643                 return -ENOMEM;
1644         }
1645
1646         /* Fills VBI device info */
1647         dev->vbi_dev->type = VFL_TYPE_VBI;
1648         dev->vbi_dev->fops = &em28xx_v4l_fops;
1649         dev->vbi_dev->minor = -1;
1650         dev->vbi_dev->dev = &dev->udev->dev;
1651         dev->vbi_dev->release = video_device_release;
1652         snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1653                                                          "em28xx",dev->devno,"vbi");
1654
1655         /* Fills CAPTURE device info */
1656         dev->vdev->type = VID_TYPE_CAPTURE;
1657         if (dev->has_tuner)
1658                 dev->vdev->type |= VID_TYPE_TUNER;
1659         dev->vdev->fops = &em28xx_v4l_fops;
1660         dev->vdev->minor = -1;
1661         dev->vdev->dev = &dev->udev->dev;
1662         dev->vdev->release = video_device_release;
1663         snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1664                                                          "em28xx",dev->devno,"video");
1665
1666         list_add_tail(&dev->devlist,&em28xx_devlist);
1667
1668
1669         if (dev->has_msp34xx) {
1670                 /* Send a reset to other chips via gpio */
1671                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1672                 msleep(3);
1673                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1674                 msleep(3);
1675
1676         }
1677         video_mux(dev, 0);
1678
1679         /* register v4l2 device */
1680         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1681                                          video_nr[dev->devno]))) {
1682                 em28xx_errdev("unable to register video device (error=%i).\n",
1683                               retval);
1684                 mutex_unlock(&dev->lock);
1685                 list_del(&dev->devlist);
1686                 video_device_release(dev->vdev);
1687                 em28xx_devused&=~(1<<dev->devno);
1688                 kfree(dev);
1689                 return -ENODEV;
1690         }
1691
1692         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1693                                         vbi_nr[dev->devno]) < 0) {
1694                 printk("unable to register vbi device\n");
1695                 mutex_unlock(&dev->lock);
1696                 list_del(&dev->devlist);
1697                 video_device_release(dev->vbi_dev);
1698                 video_device_release(dev->vdev);
1699                 em28xx_devused&=~(1<<dev->devno);
1700                 kfree(dev);
1701                 return -ENODEV;
1702         } else {
1703                 printk("registered VBI\n");
1704         }
1705
1706         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1707                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1708                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1709
1710         return 0;
1711 }
1712
1713 /*
1714  * em28xx_usb_probe()
1715  * checks for supported devices
1716  */
1717 static int em28xx_usb_probe(struct usb_interface *interface,
1718                             const struct usb_device_id *id)
1719 {
1720         const struct usb_endpoint_descriptor *endpoint;
1721         struct usb_device *udev;
1722         struct usb_interface *uif;
1723         struct em28xx *dev = NULL;
1724         int retval = -ENODEV;
1725         int i, nr, ifnum;
1726
1727         udev = usb_get_dev(interface_to_usbdev(interface));
1728         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1729
1730         /* Check to see next free device and mark as used */
1731         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1732         em28xx_devused|=1<<nr;
1733
1734         /* Don't register audio interfaces */
1735         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1736                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1737                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1738                                 ifnum,
1739                                 interface->altsetting[0].desc.bInterfaceClass);
1740
1741                 em28xx_devused&=~(1<<nr);
1742                 return -ENODEV;
1743         }
1744
1745         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1746                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1747                         ifnum,
1748                         interface->altsetting[0].desc.bInterfaceClass);
1749
1750         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1751
1752         /* check if the device has the iso in endpoint at the correct place */
1753         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1754             USB_ENDPOINT_XFER_ISOC) {
1755                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1756                 em28xx_devused&=~(1<<nr);
1757                 return -ENODEV;
1758         }
1759         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1760                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1761                 em28xx_devused&=~(1<<nr);
1762                 return -ENODEV;
1763         }
1764
1765         if (nr >= EM28XX_MAXBOARDS) {
1766                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1767                 em28xx_devused&=~(1<<nr);
1768                 return -ENOMEM;
1769         }
1770
1771         /* allocate memory for our device state and initialize it */
1772         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1773         if (dev == NULL) {
1774                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1775                 em28xx_devused&=~(1<<nr);
1776                 return -ENOMEM;
1777         }
1778
1779         snprintf(dev->name, 29, "em28xx #%d", nr);
1780         dev->devno = nr;
1781         dev->model = id->driver_info;
1782
1783         /* compute alternate max packet sizes */
1784         uif = udev->actconfig->interface[0];
1785
1786         dev->num_alt=uif->num_altsetting;
1787         em28xx_info("Alternate settings: %i\n",dev->num_alt);
1788 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1789         dev->alt_max_pkt_size = kmalloc(32*
1790                                                 dev->num_alt,GFP_KERNEL);
1791         if (dev->alt_max_pkt_size == NULL) {
1792                 em28xx_errdev("out of memory!\n");
1793                 em28xx_devused&=~(1<<nr);
1794                 kfree(dev);
1795                 return -ENOMEM;
1796         }
1797
1798         for (i = 0; i < dev->num_alt ; i++) {
1799                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1800                                                         wMaxPacketSize);
1801                 dev->alt_max_pkt_size[i] =
1802                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1803                 em28xx_info("Alternate setting %i, max size= %i\n",i,
1804                                                         dev->alt_max_pkt_size[i]);
1805         }
1806
1807         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1808                 dev->model = card[nr];
1809
1810         /* allocate device struct */
1811         retval = em28xx_init_dev(&dev, udev, nr);
1812         if (retval)
1813                 return retval;
1814
1815         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
1816
1817         /* save our data pointer in this interface device */
1818         usb_set_intfdata(interface, dev);
1819         return 0;
1820 }
1821
1822 /*
1823  * em28xx_usb_disconnect()
1824  * called when the device gets diconencted
1825  * video device will be unregistered on v4l2_close in case it is still open
1826  */
1827 static void em28xx_usb_disconnect(struct usb_interface *interface)
1828 {
1829         struct em28xx *dev;
1830
1831         dev = usb_get_intfdata(interface);
1832         usb_set_intfdata(interface, NULL);
1833
1834         if (!dev)
1835                 return;
1836
1837         em28xx_info("disconnecting %s\n", dev->vdev->name);
1838
1839         /* wait until all current v4l2 io is finished then deallocate resources */
1840         mutex_lock(&dev->lock);
1841
1842         wake_up_interruptible_all(&dev->open);
1843
1844         if (dev->users) {
1845                 em28xx_warn
1846                     ("device /dev/video%d is open! Deregistration and memory "
1847                      "deallocation are deferred on close.\n",
1848                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1849
1850                 dev->state |= DEV_MISCONFIGURED;
1851                 em28xx_uninit_isoc(dev);
1852                 dev->state |= DEV_DISCONNECTED;
1853                 wake_up_interruptible(&dev->wait_frame);
1854                 wake_up_interruptible(&dev->wait_stream);
1855         } else {
1856                 dev->state |= DEV_DISCONNECTED;
1857                 em28xx_release_resources(dev);
1858         }
1859
1860
1861         mutex_unlock(&dev->lock);
1862
1863         if (!dev->users) {
1864                 kfree(dev->alt_max_pkt_size);
1865                 kfree(dev);
1866         }
1867
1868 }
1869
1870 static struct usb_driver em28xx_usb_driver = {
1871         .name = "em28xx",
1872         .probe = em28xx_usb_probe,
1873         .disconnect = em28xx_usb_disconnect,
1874         .id_table = em28xx_id_table,
1875 };
1876
1877 static int __init em28xx_module_init(void)
1878 {
1879         int result;
1880
1881         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1882                (EM28XX_VERSION_CODE >> 16) & 0xff,
1883                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1884 #ifdef SNAPSHOT
1885         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1886                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1887 #endif
1888
1889         /* register this driver with the USB subsystem */
1890         result = usb_register(&em28xx_usb_driver);
1891         if (result)
1892                 em28xx_err(DRIVER_NAME
1893                            " usb_register failed. Error number %d.\n", result);
1894
1895         return result;
1896 }
1897
1898 static void __exit em28xx_module_exit(void)
1899 {
1900         /* deregister this driver with the USB subsystem */
1901         usb_deregister(&em28xx_usb_driver);
1902 }
1903
1904 module_init(em28xx_module_init);
1905 module_exit(em28xx_module_exit);