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@brturbo.com.br>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License 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
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/usb.h>
  29 #include <linux/i2c.h>
  30 #include <linux/video_decoder.h>
  31 #include <linux/utsname.h>
  32
  33 #include "em28xx.h"
  34 #include <media/tuner.h>
  35
  36 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  37                       "Markus Rechberger <mrechberger@gmail.com>, " \
  38                       "Mauro Carvalho Chehab <mchehab@brturbo.com.br>, " \
  39                       "Sascha Sommer <saschasommer@freenet.de>"
  40
  41 #define DRIVER_NAME         "em28xx"
  42 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  43 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
  44
  45 #define em28xx_videodbg(fmt, arg...) do {\
  46         if (video_debug) \
  47                 printk(KERN_INFO "%s %s :"fmt, \
  48                          dev->name, __FUNCTION__ , ##arg); } while (0)
  49
  50 MODULE_AUTHOR(DRIVER_AUTHOR);
  51 MODULE_DESCRIPTION(DRIVER_DESC);
  52 MODULE_LICENSE("GPL");
  53
  54 static LIST_HEAD(em28xx_devlist);
  55
  56 static unsigned int card[]  = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  57
  58 module_param_array(card,  int, NULL, 0444);
  59 MODULE_PARM_DESC(card,"card type");
  60
  61 static int tuner = -1;
  62 module_param(tuner, int, 0444);
  63 MODULE_PARM_DESC(tuner, "tuner type");
  64
  65 static unsigned int video_debug = 0;
  66 module_param(video_debug,int,0644);
  67 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  68
  69 /* supported tv norms */
  70 static struct em28xx_tvnorm tvnorms[] = {
  71         {
  72                 .name = "PAL",
  73                 .id = V4L2_STD_PAL,
  74                 .mode = VIDEO_MODE_PAL,
  75          }, {
  76                 .name = "NTSC",
  77                 .id = V4L2_STD_NTSC,
  78                 .mode = VIDEO_MODE_NTSC,
  79         }, {
  80                  .name = "SECAM",
  81                  .id = V4L2_STD_SECAM,
  82                  .mode = VIDEO_MODE_SECAM,
  83         }, {
  84                 .name = "PAL-M",
  85                 .id = V4L2_STD_PAL_M,
  86                 .mode = VIDEO_MODE_PAL,
  87         }
  88 };
  89
  90 static const unsigned char saa7114_i2c_init[] = {
  91         0x00,0x00,0x01,0x08,0x02,0xc4,0x03,0x30,0x04,0x90,0x05,0x90,0x06,0xeb,0x07,0xe0,
  92         0x08,0x88,0x09,0x40,0x0a,0x80,0x0b,0x44,0x0c,0x40,0x0d,0x00,0x0e,0x81,0x0f,0x2a,
  93         0x10,0x06,0x11,0x00,0x12,0xc8,0x13,0x80,0x14,0x00,0x15,0x11,0x16,0x01,0x17,0x42,
  94         0x18,0x40,0x19,0x80,0x40,0x00,0x41,0xff,0x42,0xff,0x43,0xff,0x44,0xff,0x45,0xff,
  95         0x46,0xff,0x47,0xff,0x48,0xff,0x49,0xff,0x4a,0xff,0x4b,0xff,0x4c,0xff,0x4d,0xff,
  96         0x4e,0xff,0x4f,0xff,0x50,0xff,0x51,0xff,0x52,0xff,0x53,0xff,0x54,0x5f,0x55,0xff,
  97         0x56,0xff,0x57,0xff,0x58,0x00,0x59,0x47,0x5a,0x03,0x5b,0x03,0x5d,0x3e,0x5e,0x00,
  98         0x80,0x1c,0x83,0x01,0x84,0xa5,0x85,0x10,0x86,0x45,0x87,0x41,0x88,0xf0,0x88,0x00,
  99         0x88,0xf0,0x90,0x00,0x91,0x08,0x92,0x00,0x93,0x80,0x94,0x08,0x95,0x00,0x96,0xc0,
 100         0x97,0x02,0x98,0x13,0x99,0x00,0x9a,0x38,0x9b,0x01,0x9c,0x80,0x9d,0x02,0x9e,0x06,
 101         0x9f,0x01,0xa0,0x01,0xa1,0x00,0xa2,0x00,0xa4,0x80,0xa5,0x36,0xa6,0x36,0xa8,0x67,
 102         0xa9,0x04,0xaa,0x00,0xac,0x33,0xad,0x02,0xae,0x00,0xb0,0xcd,0xb1,0x04,0xb2,0xcd,
 103         0xb3,0x04,0xb4,0x01,0xb8,0x00,0xb9,0x00,0xba,0x00,0xbb,0x00,0xbc,0x00,0xbd,0x00,
 104         0xbe,0x00,0xbf,0x00
 105 };
 106
 107 #define TVNORMS ARRAY_SIZE(tvnorms)
 108
 109 /* supported controls */
 110 static struct v4l2_queryctrl em28xx_qctrl[] = {
 111         {
 112                 .id = V4L2_CID_BRIGHTNESS,
 113                 .type = V4L2_CTRL_TYPE_INTEGER,
 114                 .name = "Brightness",
 115                 .minimum = -128,
 116                 .maximum = 127,
 117                 .step = 1,
 118                 .default_value = 0,
 119                 .flags = 0,
 120         },{
 121                 .id = V4L2_CID_CONTRAST,
 122                 .type = V4L2_CTRL_TYPE_INTEGER,
 123                 .name = "Contrast",
 124                 .minimum = 0x0,
 125                 .maximum = 0x1f,
 126                 .step = 0x1,
 127                 .default_value = 0x10,
 128                 .flags = 0,
 129         },{
 130                 .id = V4L2_CID_SATURATION,
 131                 .type = V4L2_CTRL_TYPE_INTEGER,
 132                 .name = "Saturation",
 133                 .minimum = 0x0,
 134                 .maximum = 0x1f,
 135                 .step = 0x1,
 136                 .default_value = 0x10,
 137                 .flags = 0,
 138         },{
 139                 .id = V4L2_CID_AUDIO_VOLUME,
 140                 .type = V4L2_CTRL_TYPE_INTEGER,
 141                 .name = "Volume",
 142                 .minimum = 0x0,
 143                 .maximum = 0x1f,
 144                 .step = 0x1,
 145                 .default_value = 0x1f,
 146                 .flags = 0,
 147         },{
 148                 .id = V4L2_CID_AUDIO_MUTE,
 149                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 150                 .name = "Mute",
 151                 .minimum = 0,
 152                 .maximum = 1,
 153                 .step = 1,
 154                 .default_value = 1,
 155                 .flags = 0,
 156         },{
 157                 .id = V4L2_CID_RED_BALANCE,
 158                 .type = V4L2_CTRL_TYPE_INTEGER,
 159                 .name = "Red chroma balance",
 160                 .minimum = -128,
 161                 .maximum = 127,
 162                 .step = 1,
 163                 .default_value = 0,
 164                 .flags = 0,
 165         },{
 166                 .id = V4L2_CID_BLUE_BALANCE,
 167                 .type = V4L2_CTRL_TYPE_INTEGER,
 168                 .name = "Blue chroma balance",
 169                 .minimum = -128,
 170                 .maximum = 127,
 171                 .step = 1,
 172                 .default_value = 0,
 173                 .flags = 0,
 174         },{
 175                 .id = V4L2_CID_GAMMA,
 176                 .type = V4L2_CTRL_TYPE_INTEGER,
 177                 .name = "Gamma",
 178                 .minimum = 0x0,
 179                 .maximum = 0x3f,
 180                 .step = 0x1,
 181                 .default_value = 0x20,
 182                 .flags = 0,
 183          }
 184 };
 185
 186 static struct usb_driver em28xx_usb_driver;
 187
 188 static DECLARE_MUTEX(em28xx_sysfs_lock);
 189 static DECLARE_RWSEM(em28xx_disconnect);
 190
 191 /*********************  v4l2 interface  ******************************************/
 192
 193 static inline unsigned long kvirt_to_pa(unsigned long adr)
 194 {
 195         unsigned long kva, ret;
 196
 197         kva = (unsigned long)page_address(vmalloc_to_page((void *)adr));
 198         kva |= adr & (PAGE_SIZE - 1);
 199         ret = __pa(kva);
 200         return ret;
 201 }
 202
 203 /*
 204  * em28xx_config()
 205  * inits registers with sane defaults
 206  */
 207 static int em28xx_config(struct em28xx *dev)
 208 {
 209
 210         /* Sets I2C speed to 100 KHz */
 211         em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 212
 213         /* enable vbi capturing */
 214         em28xx_audio_usb_mute(dev, 1);
 215         dev->mute = 1;          /* maybe not the right place... */
 216         dev->volume = 0x1f;
 217         em28xx_audio_analog_set(dev);
 218         em28xx_audio_analog_setup(dev);
 219         em28xx_outfmt_set_yuv422(dev);
 220         em28xx_colorlevels_set_default(dev);
 221         em28xx_compression_disable(dev);
 222
 223         return 0;
 224 }
 225
 226 /*
 227  * em28xx_config_i2c()
 228  * configure i2c attached devices
 229  */
 230 void em28xx_config_i2c(struct em28xx *dev)
 231 {
 232         struct v4l2_frequency f;
 233         struct video_decoder_init em28xx_vdi = {.data = NULL };
 234
 235
 236         /* configure decoder */
 237         if(dev->model == EM2820_BOARD_MSI_VOX_USB_2){
 238                 em28xx_vdi.data=saa7114_i2c_init;
 239                 em28xx_vdi.len=sizeof(saa7114_i2c_init);
 240         }
 241
 242
 243         em28xx_i2c_call_clients(dev, DECODER_INIT, &em28xx_vdi);
 244         em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &dev->ctl_input);
 245 /*      em28xx_i2c_call_clients(dev,DECODER_SET_PICTURE, &dev->vpic); */
 246 /*      em28xx_i2c_call_clients(dev,DECODER_SET_NORM,&dev->tvnorm->id); */
 247 /*      em28xx_i2c_call_clients(dev,DECODER_ENABLE_OUTPUT,&output); */
 248 /*      em28xx_i2c_call_clients(dev,DECODER_DUMP, NULL); */
 249
 250         /* configure tuner */
 251         f.tuner = 0;
 252         f.type = V4L2_TUNER_ANALOG_TV;
 253         f.frequency = 9076;     /* FIXME:remove magic number */
 254         dev->ctl_freq = f.frequency;
 255         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 256
 257         /* configure tda9887 */
 258
 259
 260 /*      em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
 261 }
 262
 263 /*
 264  * em28xx_empty_framequeues()
 265  * prepare queues for incoming and outgoing frames
 266  */
 267 static void em28xx_empty_framequeues(struct em28xx *dev)
 268 {
 269         u32 i;
 270
 271         INIT_LIST_HEAD(&dev->inqueue);
 272         INIT_LIST_HEAD(&dev->outqueue);
 273
 274         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 275                 dev->frame[i].state = F_UNUSED;
 276                 dev->frame[i].buf.bytesused = 0;
 277         }
 278 }
 279
 280 /*
 281  * em28xx_v4l2_open()
 282  * inits the device and starts isoc transfer
 283  */
 284 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 285 {
 286         int minor = iminor(inode);
 287         int errCode = 0;
 288         struct em28xx *h,*dev = NULL;
 289         struct list_head *list;
 290
 291         list_for_each(list,&em28xx_devlist) {
 292                 h = list_entry(list, struct em28xx, devlist);
 293                 if (h->vdev->minor == minor) {
 294                         dev  = h;
 295                 }
 296         }
 297
 298         filp->private_data=dev;
 299
 300
 301         em28xx_videodbg("users=%d", dev->users);
 302
 303         if (!down_read_trylock(&em28xx_disconnect))
 304                 return -ERESTARTSYS;
 305
 306         if (dev->users) {
 307                 em28xx_warn("this driver can be opened only once\n");
 308                 up_read(&em28xx_disconnect);
 309                 return -EBUSY;
 310         }
 311
 312 /*      if(dev->vbi_dev->minor == minor){
 313                 dev->type=V4L2_BUF_TYPE_VBI_CAPTURE;
 314         }*/
 315         if (dev->vdev->minor == minor) {
 316                 dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 317         }
 318
 319         init_MUTEX(&dev->fileop_lock);  /* to 1 == available */
 320         spin_lock_init(&dev->queue_lock);
 321         init_waitqueue_head(&dev->wait_frame);
 322         init_waitqueue_head(&dev->wait_stream);
 323
 324         down(&dev->lock);
 325
 326         em28xx_set_alternate(dev);
 327
 328         dev->width = norm_maxw(dev);
 329         dev->height = norm_maxh(dev);
 330         dev->frame_size = dev->width * dev->height * 2;
 331         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 332         dev->bytesperline = dev->width * 2;
 333         dev->hscale = 0;
 334         dev->vscale = 0;
 335
 336         em28xx_capture_start(dev, 1);
 337         em28xx_resolution_set(dev);
 338
 339         /* start the transfer */
 340         errCode = em28xx_init_isoc(dev);
 341         if (errCode)
 342                 goto err;
 343
 344         dev->users++;
 345         filp->private_data = dev;
 346         dev->io = IO_NONE;
 347         dev->stream = STREAM_OFF;
 348         dev->num_frames = 0;
 349
 350         /* prepare queues */
 351         em28xx_empty_framequeues(dev);
 352
 353         dev->state |= DEV_INITIALIZED;
 354
 355       err:
 356         up(&dev->lock);
 357         up_read(&em28xx_disconnect);
 358         return errCode;
 359 }
 360
 361 /*
 362  * em28xx_realease_resources()
 363  * unregisters the v4l2,i2c and usb devices
 364  * called when the device gets disconected or at module unload
 365 */
 366 static void em28xx_release_resources(struct em28xx *dev)
 367 {
 368         down(&em28xx_sysfs_lock);
 369
 370         em28xx_info("V4L2 device /dev/video%d deregistered\n",
 371                     dev->vdev->minor);
 372         list_del(&dev->devlist);
 373         video_unregister_device(dev->vdev);
 374 /*      video_unregister_device(dev->vbi_dev); */
 375         em28xx_i2c_unregister(dev);
 376         usb_put_dev(dev->udev);
 377         up(&em28xx_sysfs_lock);
 378 }
 379
 380 /*
 381  * em28xx_v4l2_close()
 382  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 383  */
 384 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 385 {
 386         int errCode;
 387         struct em28xx *dev=filp->private_data;
 388
 389         em28xx_videodbg("users=%d", dev->users);
 390
 391         down(&dev->lock);
 392
 393         em28xx_uninit_isoc(dev);
 394
 395         em28xx_release_buffers(dev);
 396
 397         /* the device is already disconnect, free the remaining resources */
 398         if (dev->state & DEV_DISCONNECTED) {
 399                 em28xx_release_resources(dev);
 400                 up(&dev->lock);
 401                 kfree(dev);
 402                 return 0;
 403         }
 404
 405         /* set alternate 0 */
 406         dev->alt = 0;
 407         em28xx_videodbg("setting alternate 0");
 408         errCode = usb_set_interface(dev->udev, 0, 0);
 409         if (errCode < 0) {
 410                 em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
 411                      errCode);
 412         }
 413
 414         dev->users--;
 415         wake_up_interruptible_nr(&dev->open, 1);
 416         up(&dev->lock);
 417         return 0;
 418 }
 419
 420 /*
 421  * em28xx_v4l2_read()
 422  * will allocate buffers when called for the first time
 423  */
 424 static ssize_t
 425 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
 426                  loff_t * f_pos)
 427 {
 428         struct em28xx_frame_t *f, *i;
 429         unsigned long lock_flags;
 430         int ret = 0;
 431         struct em28xx *dev = filp->private_data;
 432
 433         if (down_interruptible(&dev->fileop_lock))
 434                 return -ERESTARTSYS;
 435
 436         if (dev->state & DEV_DISCONNECTED) {
 437                 em28xx_videodbg("device not present");
 438                 up(&dev->fileop_lock);
 439                 return -ENODEV;
 440         }
 441
 442         if (dev->state & DEV_MISCONFIGURED) {
 443                 em28xx_videodbg("device misconfigured; close and open it again");
 444                 up(&dev->fileop_lock);
 445                 return -EIO;
 446         }
 447
 448         if (dev->io == IO_MMAP) {
 449                 em28xx_videodbg ("IO method is set to mmap; close and open"
 450                                 " the device again to choose the read method");
 451                 up(&dev->fileop_lock);
 452                 return -EINVAL;
 453         }
 454
 455         if (dev->io == IO_NONE) {
 456                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
 457                         em28xx_errdev("read failed, not enough memory\n");
 458                         up(&dev->fileop_lock);
 459                         return -ENOMEM;
 460                 }
 461                 dev->io = IO_READ;
 462                 dev->stream = STREAM_ON;
 463                 em28xx_queue_unusedframes(dev);
 464         }
 465
 466         if (!count) {
 467                 up(&dev->fileop_lock);
 468                 return 0;
 469         }
 470
 471         if (list_empty(&dev->outqueue)) {
 472                 if (filp->f_flags & O_NONBLOCK) {
 473                         up(&dev->fileop_lock);
 474                         return -EAGAIN;
 475                 }
 476                 ret = wait_event_interruptible
 477                     (dev->wait_frame,
 478                      (!list_empty(&dev->outqueue)) ||
 479                      (dev->state & DEV_DISCONNECTED));
 480                 if (ret) {
 481                         up(&dev->fileop_lock);
 482                         return ret;
 483                 }
 484                 if (dev->state & DEV_DISCONNECTED) {
 485                         up(&dev->fileop_lock);
 486                         return -ENODEV;
 487                 }
 488         }
 489
 490         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
 491
 492         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 493         list_for_each_entry(i, &dev->outqueue, frame)
 494             i->state = F_UNUSED;
 495         INIT_LIST_HEAD(&dev->outqueue);
 496         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 497
 498         em28xx_queue_unusedframes(dev);
 499
 500         if (count > f->buf.length)
 501                 count = f->buf.length;
 502
 503         if (copy_to_user(buf, f->bufmem, count)) {
 504                 up(&dev->fileop_lock);
 505                 return -EFAULT;
 506         }
 507         *f_pos += count;
 508
 509         up(&dev->fileop_lock);
 510
 511         return count;
 512 }
 513
 514 /*
 515  * em28xx_v4l2_poll()
 516  * will allocate buffers when called for the first time
 517  */
 518 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
 519 {
 520         unsigned int mask = 0;
 521         struct em28xx *dev = filp->private_data;
 522
 523         if (down_interruptible(&dev->fileop_lock))
 524                 return POLLERR;
 525
 526         if (dev->state & DEV_DISCONNECTED) {
 527                 em28xx_videodbg("device not present");
 528         } else if (dev->state & DEV_MISCONFIGURED) {
 529                 em28xx_videodbg("device is misconfigured; close and open it again");
 530         } else {
 531                 if (dev->io == IO_NONE) {
 532                         if (!em28xx_request_buffers
 533                             (dev, EM28XX_NUM_READ_FRAMES)) {
 534                                 em28xx_warn
 535                                     ("poll() failed, not enough memory\n");
 536                         } else {
 537                                 dev->io = IO_READ;
 538                                 dev->stream = STREAM_ON;
 539                         }
 540                 }
 541
 542                 if (dev->io == IO_READ) {
 543                         em28xx_queue_unusedframes(dev);
 544                         poll_wait(filp, &dev->wait_frame, wait);
 545
 546                         if (!list_empty(&dev->outqueue))
 547                                 mask |= POLLIN | POLLRDNORM;
 548
 549                         up(&dev->fileop_lock);
 550
 551                         return mask;
 552                 }
 553         }
 554
 555         up(&dev->fileop_lock);
 556         return POLLERR;
 557 }
 558
 559 /*
 560  * em28xx_vm_open()
 561  */
 562 static void em28xx_vm_open(struct vm_area_struct *vma)
 563 {
 564         struct em28xx_frame_t *f = vma->vm_private_data;
 565         f->vma_use_count++;
 566 }
 567
 568 /*
 569  * em28xx_vm_close()
 570  */
 571 static void em28xx_vm_close(struct vm_area_struct *vma)
 572 {
 573         /* NOTE: buffers are not freed here */
 574         struct em28xx_frame_t *f = vma->vm_private_data;
 575         f->vma_use_count--;
 576 }
 577
 578 static struct vm_operations_struct em28xx_vm_ops = {
 579         .open = em28xx_vm_open,
 580         .close = em28xx_vm_close,
 581 };
 582
 583 /*
 584  * em28xx_v4l2_mmap()
 585  */
 586 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 587 {
 588         unsigned long size = vma->vm_end - vma->vm_start,
 589             start = vma->vm_start, pos, page;
 590         u32 i;
 591
 592         struct em28xx *dev = filp->private_data;
 593
 594         if (down_interruptible(&dev->fileop_lock))
 595                 return -ERESTARTSYS;
 596
 597         if (dev->state & DEV_DISCONNECTED) {
 598                 em28xx_videodbg("mmap: device not present");
 599                 up(&dev->fileop_lock);
 600                 return -ENODEV;
 601         }
 602
 603         if (dev->state & DEV_MISCONFIGURED) {
 604                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
 605                                                 "open it again");
 606                 up(&dev->fileop_lock);
 607                 return -EIO;
 608         }
 609
 610         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
 611             size != PAGE_ALIGN(dev->frame[0].buf.length)) {
 612                 up(&dev->fileop_lock);
 613                 return -EINVAL;
 614         }
 615
 616         for (i = 0; i < dev->num_frames; i++) {
 617                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
 618                         break;
 619         }
 620         if (i == dev->num_frames) {
 621                 em28xx_videodbg("mmap: user supplied mapping address is out of range");
 622                 up(&dev->fileop_lock);
 623                 return -EINVAL;
 624         }
 625
 626         /* VM_IO is eventually going to replace PageReserved altogether */
 627         vma->vm_flags |= VM_IO;
 628         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
 629
 630         pos = (unsigned long)dev->frame[i].bufmem;
 631         while (size > 0) {      /* size is page-aligned */
 632                 page = vmalloc_to_pfn((void *)pos);
 633                 if (remap_pfn_range(vma, start, page, PAGE_SIZE,
 634                                     vma->vm_page_prot)) {
 635                         em28xx_videodbg("mmap: rename page map failed");
 636                         up(&dev->fileop_lock);
 637                         return -EAGAIN;
 638                 }
 639                 start += PAGE_SIZE;
 640                 pos += PAGE_SIZE;
 641                 size -= PAGE_SIZE;
 642         }
 643
 644         vma->vm_ops = &em28xx_vm_ops;
 645         vma->vm_private_data = &dev->frame[i];
 646
 647         em28xx_vm_open(vma);
 648         up(&dev->fileop_lock);
 649         return 0;
 650 }
 651
 652 /*
 653  * em28xx_get_ctrl()
 654  * return the current saturation, brightness or contrast, mute state
 655  */
 656 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 657 {
 658         s32 tmp;
 659         switch (ctrl->id) {
 660         case V4L2_CID_AUDIO_MUTE:
 661                 ctrl->value = dev->mute;
 662                 return 0;
 663         case V4L2_CID_AUDIO_VOLUME:
 664                 ctrl->value = dev->volume;
 665                 return 0;
 666         case V4L2_CID_BRIGHTNESS:
 667                 if ((tmp = em28xx_brightness_get(dev)) < 0)
 668                         return -EIO;
 669                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 670                 return 0;
 671         case V4L2_CID_CONTRAST:
 672                 if ((ctrl->value = em28xx_contrast_get(dev)) < 0)
 673                         return -EIO;
 674                 return 0;
 675         case V4L2_CID_SATURATION:
 676                 if ((ctrl->value = em28xx_saturation_get(dev)) < 0)
 677                         return -EIO;
 678                 return 0;
 679         case V4L2_CID_RED_BALANCE:
 680                 if ((tmp = em28xx_v_balance_get(dev)) < 0)
 681                         return -EIO;
 682                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 683                 return 0;
 684         case V4L2_CID_BLUE_BALANCE:
 685                 if ((tmp = em28xx_u_balance_get(dev)) < 0)
 686                         return -EIO;
 687                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 688                 return 0;
 689         case V4L2_CID_GAMMA:
 690                 if ((ctrl->value = em28xx_gamma_get(dev)) < 0)
 691                         return -EIO;
 692                 return 0;
 693         default:
 694                 return -EINVAL;
 695         }
 696 }
 697
 698 /*
 699  * em28xx_set_ctrl()
 700  * mute or set new saturation, brightness or contrast
 701  */
 702 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 703 {
 704         switch (ctrl->id) {
 705         case V4L2_CID_AUDIO_MUTE:
 706                 if (ctrl->value != dev->mute) {
 707                         dev->mute = ctrl->value;
 708                         em28xx_audio_usb_mute(dev, ctrl->value);
 709                         return em28xx_audio_analog_set(dev);
 710                 }
 711                 return 0;
 712         case V4L2_CID_AUDIO_VOLUME:
 713                 dev->volume = ctrl->value;
 714                 return em28xx_audio_analog_set(dev);
 715         case V4L2_CID_BRIGHTNESS:
 716                 return em28xx_brightness_set(dev, ctrl->value);
 717         case V4L2_CID_CONTRAST:
 718                 return em28xx_contrast_set(dev, ctrl->value);
 719         case V4L2_CID_SATURATION:
 720                 return em28xx_saturation_set(dev, ctrl->value);
 721         case V4L2_CID_RED_BALANCE:
 722                 return em28xx_v_balance_set(dev, ctrl->value);
 723         case V4L2_CID_BLUE_BALANCE:
 724                 return em28xx_u_balance_set(dev, ctrl->value);
 725         case V4L2_CID_GAMMA:
 726                 return em28xx_gamma_set(dev, ctrl->value);
 727         default:
 728                 return -EINVAL;
 729         }
 730 }
 731
 732 /*
 733  * em28xx_stream_interrupt()
 734  * stops streaming
 735  */
 736 static int em28xx_stream_interrupt(struct em28xx *dev)
 737 {
 738         int ret = 0;
 739
 740         /* stop reading from the device */
 741
 742         dev->stream = STREAM_INTERRUPT;
 743         ret = wait_event_timeout(dev->wait_stream,
 744                                  (dev->stream == STREAM_OFF) ||
 745                                  (dev->state & DEV_DISCONNECTED),
 746                                  EM28XX_URB_TIMEOUT);
 747         if (dev->state & DEV_DISCONNECTED)
 748                 return -ENODEV;
 749         else if (ret) {
 750                 dev->state |= DEV_MISCONFIGURED;
 751                 em28xx_videodbg("device is misconfigured; close and "
 752                         "open /dev/video%d again", dev->vdev->minor);
 753                 return ret;
 754         }
 755
 756         return 0;
 757 }
 758
 759 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
 760 {
 761         unsigned int hscale, vscale;
 762         unsigned int maxh, maxw;
 763
 764         maxw = norm_maxw(dev);
 765         maxh = norm_maxh(dev);
 766
 767         /* width must even because of the YUYV format */
 768         /* height must be even because of interlacing */
 769         height &= 0xfffe;
 770         width &= 0xfffe;
 771
 772         if (height < 32)
 773                 height = 32;
 774         if (height > maxh)
 775                 height = maxh;
 776         if (width < 48)
 777                 width = 48;
 778         if (width > maxw)
 779                 width = maxw;
 780
 781         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 782                 hscale = 0x3fff;
 783         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 784
 785         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 786                 vscale = 0x3fff;
 787         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 788
 789         /* set new image size */
 790         dev->width = width;
 791         dev->height = height;
 792         dev->frame_size = dev->width * dev->height * 2;
 793         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 794         dev->bytesperline = dev->width * 2;
 795         dev->hscale = hscale;
 796         dev->vscale = vscale;
 797
 798         em28xx_resolution_set(dev);
 799
 800         return 0;
 801 }
 802
 803 static void video_mux(struct em28xx *dev, int index)
 804 {
 805         int input, ainput;
 806
 807         input = INPUT(index)->vmux;
 808         dev->ctl_input = index;
 809
 810         em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &input);
 811
 812         dev->ctl_ainput = INPUT(index)->amux;
 813
 814         switch (dev->ctl_ainput) {
 815         case 0:
 816                 ainput = EM28XX_AUDIO_SRC_TUNER;
 817                 break;
 818         default:
 819                 ainput = EM28XX_AUDIO_SRC_LINE;
 820         }
 821
 822         em28xx_audio_source(dev, ainput);
 823 }
 824
 825 /*
 826  * em28xx_v4l2_do_ioctl()
 827  * This function is _not_ called directly, but from
 828  * em28xx_v4l2_ioctl. Userspace
 829  * copying is done already, arg is a kernel pointer.
 830  */
 831 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
 832                            struct em28xx *dev, unsigned int cmd, void *arg,
 833                            v4l2_kioctl driver_ioctl)
 834 {
 835         int ret;
 836
 837         switch (cmd) {
 838                 /* ---------- tv norms ---------- */
 839         case VIDIOC_ENUMSTD:
 840                 {
 841                         struct v4l2_standard *e = arg;
 842                         unsigned int i;
 843
 844                         i = e->index;
 845                         if (i >= TVNORMS)
 846                                 return -EINVAL;
 847                         ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 848                                                        tvnorms[e->index].name);
 849                         e->index = i;
 850                         if (ret < 0)
 851                                 return ret;
 852                         return 0;
 853                 }
 854         case VIDIOC_G_STD:
 855                 {
 856                         v4l2_std_id *id = arg;
 857
 858                         *id = dev->tvnorm->id;
 859                         return 0;
 860                 }
 861         case VIDIOC_S_STD:
 862                 {
 863                         v4l2_std_id *id = arg;
 864                         unsigned int i;
 865
 866                         for (i = 0; i < TVNORMS; i++)
 867                                 if (*id == tvnorms[i].id)
 868                                         break;
 869                         if (i == TVNORMS)
 870                                 for (i = 0; i < TVNORMS; i++)
 871                                         if (*id & tvnorms[i].id)
 872                                                 break;
 873                         if (i == TVNORMS)
 874                                 return -EINVAL;
 875
 876                         down(&dev->lock);
 877                         dev->tvnorm = &tvnorms[i];
 878
 879                         em28xx_set_norm(dev, dev->width, dev->height);
 880
 881 /*
 882                 dev->width=norm_maxw(dev);
 883                 dev->height=norm_maxh(dev);
 884                 dev->frame_size=dev->width*dev->height*2;
 885                 dev->field_size=dev->frame_size>>1;
 886                 dev->bytesperline=dev->width*2;
 887                 dev->hscale=0;
 888                 dev->vscale=0;
 889
 890                 em28xx_resolution_set(dev);
 891 */
 892 /*
 893                 em28xx_uninit_isoc(dev);
 894                 em28xx_set_alternate(dev);
 895                 em28xx_capture_start(dev, 1);
 896                 em28xx_resolution_set(dev);
 897                 em28xx_init_isoc(dev);
 898 */
 899                         em28xx_i2c_call_clients(dev, DECODER_SET_NORM,
 900                                                 &tvnorms[i].mode);
 901                         em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
 902                                                 &dev->tvnorm->id);
 903
 904                         up(&dev->lock);
 905
 906                         return 0;
 907                 }
 908
 909                 /* ------ input switching ---------- */
 910         case VIDIOC_ENUMINPUT:
 911                 {
 912                         struct v4l2_input *i = arg;
 913                         unsigned int n;
 914                         static const char *iname[] = {
 915                                 [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 916                                 [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 917                                 [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 918                                 [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 919                                 [EM28XX_VMUX_SVIDEO] = "S-Video",
 920                                 [EM28XX_VMUX_TELEVISION] = "Television",
 921                                 [EM28XX_VMUX_CABLE] = "Cable TV",
 922                                 [EM28XX_VMUX_DVB] = "DVB",
 923                                 [EM28XX_VMUX_DEBUG] = "for debug only",
 924                         };
 925
 926                         n = i->index;
 927                         if (n >= MAX_EM28XX_INPUT)
 928                                 return -EINVAL;
 929                         if (0 == INPUT(n)->type)
 930                                 return -EINVAL;
 931                         memset(i, 0, sizeof(*i));
 932                         i->index = n;
 933                         i->type = V4L2_INPUT_TYPE_CAMERA;
 934                         strcpy(i->name, iname[INPUT(n)->type]);
 935                         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 936                             (EM28XX_VMUX_CABLE == INPUT(n)->type))
 937                                 i->type = V4L2_INPUT_TYPE_TUNER;
 938                         for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
 939                                 i->std |= tvnorms[n].id;
 940                         return 0;
 941                 }
 942
 943         case VIDIOC_G_INPUT:
 944                 {
 945                         int *i = arg;
 946                         *i = dev->ctl_input;
 947
 948                         return 0;
 949                 }
 950
 951         case VIDIOC_S_INPUT:
 952                 {
 953                         int *index = arg;
 954
 955                         if (*index >= MAX_EM28XX_INPUT)
 956                                 return -EINVAL;
 957                         if (0 == INPUT(*index)->type)
 958                                 return -EINVAL;
 959
 960                         down(&dev->lock);
 961                         video_mux(dev, *index);
 962                         up(&dev->lock);
 963
 964                         return 0;
 965                 }
 966
 967         case VIDIOC_G_AUDIO:
 968                 {
 969                         struct v4l2_audio *a = arg;
 970                         unsigned int index = a->index;
 971
 972                         if (a->index > 1)
 973                                 return -EINVAL;
 974                         memset(a, 0, sizeof(*a));
 975                         index = dev->ctl_ainput;
 976
 977                         if (index == 0) {
 978                                 strcpy(a->name, "Television");
 979                         } else {
 980                                 strcpy(a->name, "Line In");
 981                         }
 982                         a->capability = V4L2_AUDCAP_STEREO;
 983                         a->index = index;
 984                         return 0;
 985                 }
 986
 987         case VIDIOC_S_AUDIO:
 988                 {
 989                         struct v4l2_audio *a = arg;
 990                         if (a->index != dev->ctl_ainput)
 991                                 return -EINVAL;
 992
 993                         return 0;
 994                 }
 995
 996                 /* --- controls ---------------------------------------------- */
 997         case VIDIOC_QUERYCTRL:
 998                 {
 999                         struct v4l2_queryctrl *qc = arg;
1000                         u8 i, n;
1001                         n = sizeof(em28xx_qctrl) / sizeof(em28xx_qctrl[0]);
1002                         for (i = 0; i < n; i++)
1003                                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1004                                         memcpy(qc, &(em28xx_qctrl[i]),
1005                                                sizeof(*qc));
1006                                         return 0;
1007                                 }
1008
1009                         return -EINVAL;
1010                 }
1011
1012         case VIDIOC_G_CTRL:
1013                 {
1014                         struct v4l2_control *ctrl = arg;
1015
1016
1017                         return em28xx_get_ctrl(dev, ctrl);
1018                 }
1019
1020         case VIDIOC_S_CTRL_OLD: /* ??? */
1021         case VIDIOC_S_CTRL:
1022                 {
1023                         struct v4l2_control *ctrl = arg;
1024                         u8 i, n;
1025
1026
1027                         n = sizeof(em28xx_qctrl) / sizeof(em28xx_qctrl[0]);
1028                         for (i = 0; i < n; i++)
1029                                 if (ctrl->id == em28xx_qctrl[i].id) {
1030                                         if (ctrl->value <
1031                                             em28xx_qctrl[i].minimum
1032                                             || ctrl->value >
1033                                             em28xx_qctrl[i].maximum)
1034                                                 return -ERANGE;
1035
1036                                         return em28xx_set_ctrl(dev, ctrl);
1037                                 }
1038                         return -EINVAL;
1039                 }
1040
1041                 /* --- tuner ioctls ------------------------------------------ */
1042         case VIDIOC_G_TUNER:
1043                 {
1044                         struct v4l2_tuner *t = arg;
1045                         int status = 0;
1046
1047                         if (0 != t->index)
1048                                 return -EINVAL;
1049
1050                         memset(t, 0, sizeof(*t));
1051                         strcpy(t->name, "Tuner");
1052                         t->type = V4L2_TUNER_ANALOG_TV;
1053                         t->capability = V4L2_TUNER_CAP_NORM;
1054                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1055 /*              t->signal = 0xffff;*/
1056 /*              em28xx_i2c_call_clients(dev,VIDIOC_G_TUNER,t);*/
1057                         /* No way to get signal strength? */
1058                         down(&dev->lock);
1059                         em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
1060                                                 &status);
1061                         up(&dev->lock);
1062                         t->signal =
1063                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1064
1065                         em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x", t->signal,
1066                                  t->afc);
1067                         return 0;
1068                 }
1069         case VIDIOC_S_TUNER:
1070                 {
1071                         struct v4l2_tuner *t = arg;
1072                         int status = 0;
1073
1074                         if (0 != t->index)
1075                                 return -EINVAL;
1076                         memset(t, 0, sizeof(*t));
1077                         strcpy(t->name, "Tuner");
1078                         t->type = V4L2_TUNER_ANALOG_TV;
1079                         t->capability = V4L2_TUNER_CAP_NORM;
1080                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1081 /*              t->signal = 0xffff; */
1082                         /* No way to get signal strength? */
1083                         down(&dev->lock);
1084                         em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
1085                                                 &status);
1086                         up(&dev->lock);
1087                         t->signal =
1088                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1089
1090                         em28xx_videodbg("VIDIO_S_TUNER: signal=%x, afc=%x\n",
1091                                  t->signal, t->afc);
1092                         return 0;
1093                 }
1094         case VIDIOC_G_FREQUENCY:
1095                 {
1096                         struct v4l2_frequency *f = arg;
1097
1098                         memset(f, 0, sizeof(*f));
1099                         f->type = V4L2_TUNER_ANALOG_TV;
1100                         f->frequency = dev->ctl_freq;
1101
1102                         return 0;
1103                 }
1104         case VIDIOC_S_FREQUENCY:
1105                 {
1106                         struct v4l2_frequency *f = arg;
1107
1108                         if (0 != f->tuner)
1109                                 return -EINVAL;
1110
1111                         if (V4L2_TUNER_ANALOG_TV != f->type)
1112                                 return -EINVAL;
1113
1114                         down(&dev->lock);
1115                         dev->ctl_freq = f->frequency;
1116                         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1117                         up(&dev->lock);
1118                         return 0;
1119                 }
1120
1121         case VIDIOC_CROPCAP:
1122                 {
1123                         struct v4l2_cropcap *cc = arg;
1124
1125                         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1126                                 return -EINVAL;
1127                         cc->bounds.left = 0;
1128                         cc->bounds.top = 0;
1129                         cc->bounds.width = dev->width;
1130                         cc->bounds.height = dev->height;
1131                         cc->defrect = cc->bounds;
1132                         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1133                         cc->pixelaspect.denominator = 59;
1134                         return 0;
1135                 }
1136         case VIDIOC_STREAMON:
1137                 {
1138                         int *type = arg;
1139
1140                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1141                             || dev->io != IO_MMAP)
1142                                 return -EINVAL;
1143
1144                         if (list_empty(&dev->inqueue))
1145                                 return -EINVAL;
1146
1147                         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1148
1149                         em28xx_videodbg("VIDIOC_STREAMON: starting stream");
1150
1151                         return 0;
1152                 }
1153         case VIDIOC_STREAMOFF:
1154                 {
1155                         int *type = arg;
1156                         int ret;
1157
1158                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1159                             || dev->io != IO_MMAP)
1160                                 return -EINVAL;
1161
1162                         if (dev->stream == STREAM_ON) {
1163                                 em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream");
1164                                 if ((ret = em28xx_stream_interrupt(dev)))
1165                                         return ret;
1166                         }
1167                         em28xx_empty_framequeues(dev);
1168
1169                         return 0;
1170                 }
1171         default:
1172                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1173                                                   driver_ioctl);
1174         }
1175         return 0;
1176 }
1177
1178 /*
1179  * em28xx_v4l2_do_ioctl()
1180  * This function is _not_ called directly, but from
1181  * em28xx_v4l2_ioctl. Userspace
1182  * copying is done already, arg is a kernel pointer.
1183  */
1184 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1185                                  unsigned int cmd, void *arg)
1186 {
1187         struct em28xx *dev = filp->private_data;
1188
1189         if (!dev)
1190                 return -ENODEV;
1191
1192         if (video_debug > 1)
1193                 em28xx_print_ioctl(dev->name,cmd);
1194
1195         switch (cmd) {
1196
1197                 /* --- capabilities ------------------------------------------ */
1198         case VIDIOC_QUERYCAP:
1199                 {
1200                         struct v4l2_capability *cap = arg;
1201
1202                         memset(cap, 0, sizeof(*cap));
1203                         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1204                         strlcpy(cap->card, em28xx_boards[dev->model].name,
1205                                 sizeof(cap->card));
1206                         strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1207                                 sizeof(cap->bus_info));
1208                         cap->version = EM28XX_VERSION_CODE;
1209                         cap->capabilities =
1210                             V4L2_CAP_VIDEO_CAPTURE |
1211                             V4L2_CAP_AUDIO |
1212                             V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1213                         if (dev->has_tuner)
1214                                 cap->capabilities |= V4L2_CAP_TUNER;
1215                         return 0;
1216                 }
1217
1218                 /* --- capture ioctls ---------------------------------------- */
1219         case VIDIOC_ENUM_FMT:
1220                 {
1221                         struct v4l2_fmtdesc *fmtd = arg;
1222
1223                         if (fmtd->index != 0)
1224                                 return -EINVAL;
1225                         memset(fmtd, 0, sizeof(*fmtd));
1226                         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1227                         strcpy(fmtd->description, "Packed YUY2");
1228                         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1229                         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1230                         return 0;
1231                 }
1232
1233         case VIDIOC_G_FMT:
1234                 {
1235                         struct v4l2_format *format = arg;
1236
1237                         em28xx_videodbg("VIDIOC_G_FMT: type=%s",
1238                                  format->type ==
1239                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1240                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1241                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1242                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1243                                  "not supported");
1244
1245                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1246                                 return -EINVAL;
1247
1248                         format->fmt.pix.width = dev->width;
1249                         format->fmt.pix.height = dev->height;
1250                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1251                         format->fmt.pix.bytesperline = dev->bytesperline;
1252                         format->fmt.pix.sizeimage = dev->frame_size;
1253                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1254                         format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
1255
1256                         em28xx_videodbg("VIDIOC_G_FMT: %dx%d", dev->width,
1257                                  dev->height);
1258                         return 0;
1259                 }
1260
1261         case VIDIOC_TRY_FMT:
1262         case VIDIOC_S_FMT:
1263                 {
1264                         struct v4l2_format *format = arg;
1265                         u32 i;
1266                         int ret = 0;
1267                         int width = format->fmt.pix.width;
1268                         int height = format->fmt.pix.height;
1269                         unsigned int hscale, vscale;
1270                         unsigned int maxh, maxw;
1271
1272                         maxw = norm_maxw(dev);
1273                         maxh = norm_maxh(dev);
1274
1275 /*              int both_fields; */
1276
1277                         em28xx_videodbg("%s: type=%s",
1278                                  cmd ==
1279                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1280                                  "VIDIOC_S_FMT",
1281                                  format->type ==
1282                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1283                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1284                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1285                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1286                                  "not supported");
1287
1288                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1289                                 return -EINVAL;
1290
1291                         em28xx_videodbg("%s: requested %dx%d",
1292                                  cmd ==
1293                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1294                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1295                                  format->fmt.pix.height);
1296
1297                         /* FIXME: Move some code away from here */
1298                         /* width must even because of the YUYV format */
1299                         /* height must be even because of interlacing */
1300                         height &= 0xfffe;
1301                         width &= 0xfffe;
1302
1303                         if (height < 32)
1304                                 height = 32;
1305                         if (height > maxh)
1306                                 height = maxh;
1307                         if (width < 48)
1308                                 width = 48;
1309                         if (width > maxw)
1310                                 width = maxw;
1311
1312                         if(dev->is_em2800){
1313                                 /* the em2800 can only scale down to 50% */
1314                                 if(height % (maxh / 2))
1315                                         height=maxh;
1316                                 if(width % (maxw / 2))
1317                                         width=maxw;
1318                                 /* according to empiatech support */
1319                                 /* the MaxPacketSize is to small to support */
1320                                 /* framesizes larger than 640x480 @ 30 fps */
1321                                 /* or 640x576 @ 25 fps. As this would cut */
1322                                 /* of a part of the image we prefer */
1323                                 /* 360x576 or 360x480 for now */
1324                                 if(width == maxw && height == maxh)
1325                                         width /= 2;
1326                         }
1327
1328                         if ((hscale =
1329                              (((unsigned long)maxw) << 12) / width - 4096L) >=
1330                             0x4000)
1331                                 hscale = 0x3fff;
1332                         width =
1333                             (((unsigned long)maxw) << 12) / (hscale + 4096L);
1334
1335                         if ((vscale =
1336                              (((unsigned long)maxh) << 12) / height - 4096L) >=
1337                             0x4000)
1338                                 vscale = 0x3fff;
1339                         height =
1340                             (((unsigned long)maxh) << 12) / (vscale + 4096L);
1341
1342                         format->fmt.pix.width = width;
1343                         format->fmt.pix.height = height;
1344                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1345                         format->fmt.pix.bytesperline = width * 2;
1346                         format->fmt.pix.sizeimage = width * 2 * height;
1347                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1348                         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
1349
1350                         em28xx_videodbg("%s: returned %dx%d (%d, %d)",
1351                                  cmd ==
1352                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1353                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1354                                  format->fmt.pix.height, hscale, vscale);
1355
1356                         if (cmd == VIDIOC_TRY_FMT)
1357                                 return 0;
1358
1359                         for (i = 0; i < dev->num_frames; i++)
1360                                 if (dev->frame[i].vma_use_count) {
1361                                         em28xx_videodbg("VIDIOC_S_FMT failed. "
1362                                                 "Unmap the buffers first.");
1363                                         return -EINVAL;
1364                                 }
1365
1366                         /* stop io in case it is already in progress */
1367                         if (dev->stream == STREAM_ON) {
1368                                 em28xx_videodbg("VIDIOC_SET_FMT: interupting stream");
1369                                 if ((ret = em28xx_stream_interrupt(dev)))
1370                                         return ret;
1371                         }
1372
1373                         em28xx_release_buffers(dev);
1374                         dev->io = IO_NONE;
1375
1376                         /* set new image size */
1377                         dev->width = width;
1378                         dev->height = height;
1379                         dev->frame_size = dev->width * dev->height * 2;
1380                         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1381                         dev->bytesperline = dev->width * 2;
1382                         dev->hscale = hscale;
1383                         dev->vscale = vscale;
1384 /*                      dev->both_fileds = both_fileds; */
1385                         em28xx_uninit_isoc(dev);
1386                         em28xx_set_alternate(dev);
1387                         em28xx_capture_start(dev, 1);
1388                         em28xx_resolution_set(dev);
1389                         em28xx_init_isoc(dev);
1390
1391                         return 0;
1392                 }
1393
1394                 /* --- streaming capture ------------------------------------- */
1395         case VIDIOC_REQBUFS:
1396                 {
1397                         struct v4l2_requestbuffers *rb = arg;
1398                         u32 i;
1399                         int ret;
1400
1401                         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1402                             rb->memory != V4L2_MEMORY_MMAP)
1403                                 return -EINVAL;
1404
1405                         if (dev->io == IO_READ) {
1406                                 em28xx_videodbg ("method is set to read;"
1407                                         " close and open the device again to"
1408                                         " choose the mmap I/O method");
1409                                 return -EINVAL;
1410                         }
1411
1412                         for (i = 0; i < dev->num_frames; i++)
1413                                 if (dev->frame[i].vma_use_count) {
1414                                         em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped");
1415                                         return -EINVAL;
1416                                 }
1417
1418                         if (dev->stream == STREAM_ON) {
1419                                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream");
1420                                 if ((ret = em28xx_stream_interrupt(dev)))
1421                                         return ret;
1422                         }
1423
1424                         em28xx_empty_framequeues(dev);
1425
1426                         em28xx_release_buffers(dev);
1427                         if (rb->count)
1428                                 rb->count =
1429                                     em28xx_request_buffers(dev, rb->count);
1430
1431                         dev->frame_current = NULL;
1432
1433                         em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i",
1434                                                      rb->count);
1435                         dev->io = rb->count ? IO_MMAP : IO_NONE;
1436                         return 0;
1437                 }
1438
1439         case VIDIOC_QUERYBUF:
1440                 {
1441                         struct v4l2_buffer *b = arg;
1442
1443                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1444                             b->index >= dev->num_frames || dev->io != IO_MMAP)
1445                                 return -EINVAL;
1446
1447                         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1448
1449                         if (dev->frame[b->index].vma_use_count) {
1450                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1451                         }
1452                         if (dev->frame[b->index].state == F_DONE)
1453                                 b->flags |= V4L2_BUF_FLAG_DONE;
1454                         else if (dev->frame[b->index].state != F_UNUSED)
1455                                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1456                         return 0;
1457                 }
1458         case VIDIOC_QBUF:
1459                 {
1460                         struct v4l2_buffer *b = arg;
1461                         unsigned long lock_flags;
1462
1463                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1464                             b->index >= dev->num_frames || dev->io != IO_MMAP) {
1465                                 return -EINVAL;
1466                         }
1467
1468                         if (dev->frame[b->index].state != F_UNUSED) {
1469                                 return -EAGAIN;
1470                         }
1471                         dev->frame[b->index].state = F_QUEUED;
1472
1473                         /* add frame to fifo */
1474                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1475                         list_add_tail(&dev->frame[b->index].frame,
1476                                       &dev->inqueue);
1477                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1478
1479                         return 0;
1480                 }
1481         case VIDIOC_DQBUF:
1482                 {
1483                         struct v4l2_buffer *b = arg;
1484                         struct em28xx_frame_t *f;
1485                         unsigned long lock_flags;
1486                         int ret = 0;
1487
1488                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1489                             || dev->io != IO_MMAP)
1490                                 return -EINVAL;
1491
1492                         if (list_empty(&dev->outqueue)) {
1493                                 if (dev->stream == STREAM_OFF)
1494                                         return -EINVAL;
1495                                 if (filp->f_flags & O_NONBLOCK)
1496                                         return -EAGAIN;
1497                                 ret = wait_event_interruptible
1498                                     (dev->wait_frame,
1499                                      (!list_empty(&dev->outqueue)) ||
1500                                      (dev->state & DEV_DISCONNECTED));
1501                                 if (ret)
1502                                         return ret;
1503                                 if (dev->state & DEV_DISCONNECTED)
1504                                         return -ENODEV;
1505                         }
1506
1507                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1508                         f = list_entry(dev->outqueue.next,
1509                                        struct em28xx_frame_t, frame);
1510                         list_del(dev->outqueue.next);
1511                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1512
1513                         f->state = F_UNUSED;
1514                         memcpy(b, &f->buf, sizeof(*b));
1515
1516                         if (f->vma_use_count)
1517                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1518
1519                         return 0;
1520                 }
1521         default:
1522                 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1523                                        em28xx_video_do_ioctl);
1524         }
1525         return 0;
1526 }
1527
1528 /*
1529  * em28xx_v4l2_ioctl()
1530  * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1531  */
1532 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1533                              unsigned int cmd, unsigned long arg)
1534 {
1535         int ret = 0;
1536         struct em28xx *dev = filp->private_data;
1537
1538         if (down_interruptible(&dev->fileop_lock))
1539                 return -ERESTARTSYS;
1540
1541         if (dev->state & DEV_DISCONNECTED) {
1542                 em28xx_errdev("v4l2 ioctl: device not present\n");
1543                 up(&dev->fileop_lock);
1544                 return -ENODEV;
1545         }
1546
1547         if (dev->state & DEV_MISCONFIGURED) {
1548                 em28xx_errdev
1549                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1550                 up(&dev->fileop_lock);
1551                 return -EIO;
1552         }
1553
1554         ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1555
1556         up(&dev->fileop_lock);
1557
1558         return ret;
1559 }
1560
1561 static struct file_operations em28xx_v4l_fops = {
1562         .owner = THIS_MODULE,
1563         .open = em28xx_v4l2_open,
1564         .release = em28xx_v4l2_close,
1565         .ioctl = em28xx_v4l2_ioctl,
1566         .read = em28xx_v4l2_read,
1567         .poll = em28xx_v4l2_poll,
1568         .mmap = em28xx_v4l2_mmap,
1569         .llseek = no_llseek,
1570 };
1571
1572 /******************************** usb interface *****************************************/
1573
1574 /*
1575  * em28xx_init_dev()
1576  * allocates and inits the device structs, registers i2c bus and v4l device
1577  */
1578 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1579                            int minor, int model)
1580 {
1581         struct em28xx *dev = *devhandle;
1582         int retval = -ENOMEM;
1583         int errCode, i;
1584         unsigned int maxh, maxw;
1585         struct usb_interface *uif;
1586
1587         dev->udev = udev;
1588         dev->model = model;
1589         init_MUTEX(&dev->lock);
1590         init_waitqueue_head(&dev->open);
1591
1592         dev->em28xx_write_regs = em28xx_write_regs;
1593         dev->em28xx_read_reg = em28xx_read_reg;
1594         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1595         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1596         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1597         dev->is_em2800 = em28xx_boards[model].is_em2800;
1598         dev->has_tuner = em28xx_boards[model].has_tuner;
1599         dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
1600         dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
1601         dev->decoder = em28xx_boards[model].decoder;
1602
1603         if (tuner >= 0)
1604                 dev->tuner_type = tuner;
1605         else
1606                 dev->tuner_type = em28xx_boards[model].tuner_type;
1607
1608         dev->video_inputs = em28xx_boards[model].vchannels;
1609
1610         for (i = 0; i < TVNORMS; i++)
1611                 if (em28xx_boards[model].norm == tvnorms[i].mode)
1612                         break;
1613         if (i == TVNORMS)
1614                 i = 0;
1615
1616         dev->tvnorm = &tvnorms[i];      /* set default norm */
1617
1618         em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1619
1620         maxw = norm_maxw(dev);
1621         maxh = norm_maxh(dev);
1622
1623         /* set default image size */
1624         dev->width = maxw;
1625         dev->height = maxh;
1626         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1627         dev->field_size = dev->width * dev->height;
1628         dev->frame_size =
1629             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1630         dev->bytesperline = dev->width * 2;
1631         dev->hscale = 0;
1632         dev->vscale = 0;
1633         dev->ctl_input = 2;
1634
1635         /* setup video picture settings for saa7113h */
1636         memset(&dev->vpic, 0, sizeof(dev->vpic));
1637         dev->vpic.colour = 128 << 8;
1638         dev->vpic.hue = 128 << 8;
1639         dev->vpic.brightness = 128 << 8;
1640         dev->vpic.contrast = 192 << 8;
1641         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1642         dev->vpic.depth = 16;
1643         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1644
1645         /* compute alternate max packet sizes */
1646         uif = dev->udev->actconfig->interface[0];
1647         dev->alt_max_pkt_size[0] = 0;
1648         for (i = 1; i <= EM28XX_MAX_ALT && i < uif->num_altsetting ; i++) {
1649                 u16 tmp =
1650                     le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1651                                 wMaxPacketSize);
1652                 dev->alt_max_pkt_size[i] =
1653                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1654         }
1655
1656 #ifdef CONFIG_MODULES
1657         /* request some modules */
1658         if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
1659                 request_module("saa711x");
1660         if (dev->decoder == EM28XX_TVP5150)
1661                 request_module("tvp5150");
1662         if (dev->has_tuner)
1663                 request_module("tuner");
1664         if (dev->tda9887_conf)
1665                 request_module("tda9887");
1666 #endif
1667         errCode = em28xx_config(dev);
1668         if (errCode) {
1669                 em28xx_errdev("error configuring device\n");
1670                 kfree(dev);
1671                 return -ENOMEM;
1672         }
1673
1674         down(&dev->lock);
1675         /* register i2c bus */
1676         em28xx_i2c_register(dev);
1677
1678         /* Do board specific init and eeprom reading */
1679         em28xx_card_setup(dev);
1680
1681         /* configure the device */
1682         em28xx_config_i2c(dev);
1683
1684         up(&dev->lock);
1685
1686         errCode = em28xx_config(dev);
1687
1688 #ifdef CONFIG_MODULES
1689         if (dev->has_msp34xx)
1690                 request_module("msp3400");
1691 #endif
1692         /* allocate and fill v4l2 device struct */
1693         dev->vdev = video_device_alloc();
1694         if (NULL == dev->vdev) {
1695                 em28xx_errdev("cannot allocate video_device.\n");
1696                 kfree(dev);
1697                 return -ENOMEM;
1698         }
1699
1700         dev->vdev->type = VID_TYPE_CAPTURE;
1701         if (dev->has_tuner)
1702                 dev->vdev->type |= VID_TYPE_TUNER;
1703         dev->vdev->hardware = 0;
1704         dev->vdev->fops = &em28xx_v4l_fops;
1705         dev->vdev->minor = -1;
1706         dev->vdev->dev = &dev->udev->dev;
1707         dev->vdev->release = video_device_release;
1708         snprintf(dev->vdev->name, sizeof(dev->vdev->name), "%s",
1709                  "em28xx video");
1710         list_add_tail(&dev->devlist,&em28xx_devlist);
1711
1712         /* register v4l2 device */
1713         down(&dev->lock);
1714         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER, -1))) {
1715                 em28xx_errdev("unable to register video device (error=%i).\n",
1716                               retval);
1717                 up(&dev->lock);
1718                 list_del(&dev->devlist);
1719                 video_device_release(dev->vdev);
1720                 kfree(dev);
1721                 return -ENODEV;
1722         }
1723         if (dev->has_msp34xx) {
1724                 /* Send a reset to other chips via gpio */
1725                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1726                 udelay(2500);
1727                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1728                 udelay(2500);
1729
1730         }
1731         video_mux(dev, 0);
1732
1733         up(&dev->lock);
1734
1735         em28xx_info("V4L2 device registered as /dev/video%d\n",
1736                     dev->vdev->minor);
1737
1738         return 0;
1739 }
1740
1741 /*
1742  * em28xx_usb_probe()
1743  * checks for supported devices
1744  */
1745 static int em28xx_usb_probe(struct usb_interface *interface,
1746                             const struct usb_device_id *id)
1747 {
1748         const struct usb_endpoint_descriptor *endpoint;
1749         struct usb_device *udev;
1750         struct em28xx *dev = NULL;
1751         int retval = -ENODEV;
1752         int model,i,nr,ifnum;
1753
1754         udev = usb_get_dev(interface_to_usbdev(interface));
1755         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1756
1757
1758         /* Don't register audio interfaces */
1759         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1760                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1761                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1762                                 ifnum,
1763                                 interface->altsetting[0].desc.bInterfaceClass);
1764                 return -ENODEV;
1765         }
1766
1767         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1768                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1769                         ifnum,
1770                         interface->altsetting[0].desc.bInterfaceClass);
1771
1772         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1773
1774         /* check if the the device has the iso in endpoint at the correct place */
1775         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1776             USB_ENDPOINT_XFER_ISOC) {
1777                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1778                 return -ENODEV;
1779         }
1780         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1781                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1782                 return -ENODEV;
1783         }
1784
1785         model=id->driver_info;
1786         nr=interface->minor;
1787
1788         if (nr>EM28XX_MAXBOARDS) {
1789                 printk ("em28xx: Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1790                 return -ENOMEM;
1791         }
1792
1793         /* allocate memory for our device state and initialize it */
1794         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1795         if (dev == NULL) {
1796                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1797                 return -ENOMEM;
1798         }
1799         memset(dev, 0, sizeof(*dev));
1800
1801         snprintf(dev->name, 29, "em28xx #%d", nr);
1802
1803         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1804                 model=card[nr];
1805
1806         if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
1807                 printk( "%s: Your board has no eeprom inside it and thus can't\n"
1808                         "%s: be autodetected.  Please pass card=<n> insmod option to\n"
1809                         "%s: workaround that.  Redirect complaints to the vendor of\n"
1810                         "%s: the TV card.  Best regards,\n"
1811                         "%s:         -- tux\n",
1812                         dev->name,dev->name,dev->name,dev->name,dev->name);
1813                 printk("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
1814                         dev->name);
1815                 for (i = 0; i < em28xx_bcount; i++) {
1816                         printk("%s:    card=%d -> %s\n",
1817                                 dev->name, i, em28xx_boards[i].name);
1818                 }
1819         }
1820
1821         /* allocate device struct */
1822         retval = em28xx_init_dev(&dev, udev, nr, model);
1823         if (retval)
1824                 return retval;
1825
1826         em28xx_info("Found %s\n", em28xx_boards[model].name);
1827
1828         /* save our data pointer in this interface device */
1829         usb_set_intfdata(interface, dev);
1830         return 0;
1831 }
1832
1833 /*
1834  * em28xx_usb_disconnect()
1835  * called when the device gets diconencted
1836  * video device will be unregistered on v4l2_close in case it is still open
1837  */
1838 static void em28xx_usb_disconnect(struct usb_interface *interface)
1839 {
1840         struct em28xx *dev = usb_get_intfdata(interface);
1841         usb_set_intfdata(interface, NULL);
1842
1843         if (!dev)
1844                 return;
1845
1846         down_write(&em28xx_disconnect);
1847
1848         down(&dev->lock);
1849
1850         em28xx_info("disconnecting %s\n", dev->vdev->name);
1851
1852         wake_up_interruptible_all(&dev->open);
1853
1854         if (dev->users) {
1855                 em28xx_warn
1856                     ("device /dev/video%d is open! Deregistration and memory "
1857                      "deallocation are deferred on close.\n", dev->vdev->minor);
1858                 dev->state |= DEV_MISCONFIGURED;
1859                 em28xx_uninit_isoc(dev);
1860                 dev->state |= DEV_DISCONNECTED;
1861                 wake_up_interruptible(&dev->wait_frame);
1862                 wake_up_interruptible(&dev->wait_stream);
1863         } else {
1864                 dev->state |= DEV_DISCONNECTED;
1865                 em28xx_release_resources(dev);
1866         }
1867
1868         up(&dev->lock);
1869
1870         if (!dev->users)
1871                 kfree(dev);
1872
1873         up_write(&em28xx_disconnect);
1874
1875 }
1876
1877 static struct usb_driver em28xx_usb_driver = {
1878         .owner = THIS_MODULE,
1879         .name = "em28xx",
1880         .probe = em28xx_usb_probe,
1881         .disconnect = em28xx_usb_disconnect,
1882         .id_table = em28xx_id_table,
1883 };
1884
1885 static int __init em28xx_module_init(void)
1886 {
1887         int result;
1888
1889         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1890                (EM28XX_VERSION_CODE >> 16) & 0xff,
1891                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1892 #ifdef SNAPSHOT
1893         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1894                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1895 #endif
1896
1897         /* register this driver with the USB subsystem */
1898         result = usb_register(&em28xx_usb_driver);
1899         if (result)
1900                 em28xx_err(DRIVER_NAME
1901                            " usb_register failed. Error number %d.\n", result);
1902
1903         return result;
1904 }
1905
1906 static void __exit em28xx_module_exit(void)
1907 {
1908         /* deregister this driver with the USB subsystem */
1909         usb_deregister(&em28xx_usb_driver);
1910 }
1911
1912 module_init(em28xx_module_init);
1913 module_exit(em28xx_module_exit);