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/version.h>
  31 #include <linux/video_decoder.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 module_param_array(card,  int, NULL, 0444);
  58 MODULE_PARM_DESC(card,"card type");
  59
  60 static int tuner = -1;
  61 module_param(tuner, int, 0444);
  62 MODULE_PARM_DESC(tuner, "tuner type");
  63
  64 static unsigned int video_debug = 0;
  65 module_param(video_debug,int,0644);
  66 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  67
  68 /* supported tv norms */
  69 static struct em28xx_tvnorm tvnorms[] = {
  70         {
  71                 .name = "PAL",
  72                 .id = V4L2_STD_PAL,
  73                 .mode = VIDEO_MODE_PAL,
  74          }, {
  75                 .name = "NTSC",
  76                 .id = V4L2_STD_NTSC,
  77                 .mode = VIDEO_MODE_NTSC,
  78         }, {
  79                  .name = "SECAM",
  80                  .id = V4L2_STD_SECAM,
  81                  .mode = VIDEO_MODE_SECAM,
  82         }, {
  83                 .name = "PAL-M",
  84                 .id = V4L2_STD_PAL_M,
  85                 .mode = VIDEO_MODE_PAL,
  86         }
  87 };
  88
  89 static const unsigned char saa7114_i2c_init[] = {
  90         0x00,0x00,0x01,0x08,0x02,0xc4,0x03,0x30,0x04,0x90,0x05,0x90,0x06,0xeb,0x07,0xe0,
  91         0x08,0x88,0x09,0x40,0x0a,0x80,0x0b,0x44,0x0c,0x40,0x0d,0x00,0x0e,0x81,0x0f,0x2a,
  92         0x10,0x06,0x11,0x00,0x12,0xc8,0x13,0x80,0x14,0x00,0x15,0x11,0x16,0x01,0x17,0x42,
  93         0x18,0x40,0x19,0x80,0x40,0x00,0x41,0xff,0x42,0xff,0x43,0xff,0x44,0xff,0x45,0xff,
  94         0x46,0xff,0x47,0xff,0x48,0xff,0x49,0xff,0x4a,0xff,0x4b,0xff,0x4c,0xff,0x4d,0xff,
  95         0x4e,0xff,0x4f,0xff,0x50,0xff,0x51,0xff,0x52,0xff,0x53,0xff,0x54,0x5f,0x55,0xff,
  96         0x56,0xff,0x57,0xff,0x58,0x00,0x59,0x47,0x5a,0x03,0x5b,0x03,0x5d,0x3e,0x5e,0x00,
  97         0x80,0x1c,0x83,0x01,0x84,0xa5,0x85,0x10,0x86,0x45,0x87,0x41,0x88,0xf0,0x88,0x00,
  98         0x88,0xf0,0x90,0x00,0x91,0x08,0x92,0x00,0x93,0x80,0x94,0x08,0x95,0x00,0x96,0xc0,
  99         0x97,0x02,0x98,0x13,0x99,0x00,0x9a,0x38,0x9b,0x01,0x9c,0x80,0x9d,0x02,0x9e,0x06,
 100         0x9f,0x01,0xa0,0x01,0xa1,0x00,0xa2,0x00,0xa4,0x80,0xa5,0x36,0xa6,0x36,0xa8,0x67,
 101         0xa9,0x04,0xaa,0x00,0xac,0x33,0xad,0x02,0xae,0x00,0xb0,0xcd,0xb1,0x04,0xb2,0xcd,
 102         0xb3,0x04,0xb4,0x01,0xb8,0x00,0xb9,0x00,0xba,0x00,0xbb,0x00,0xbc,0x00,0xbd,0x00,
 103         0xbe,0x00,0xbf,0x00
 104 };
 105
 106 #define TVNORMS ARRAY_SIZE(tvnorms)
 107
 108 /* supported controls */
 109 static struct v4l2_queryctrl em28xx_qctrl[] = {
 110         {
 111                 .id = V4L2_CID_BRIGHTNESS,
 112                 .type = V4L2_CTRL_TYPE_INTEGER,
 113                 .name = "Brightness",
 114                 .minimum = -128,
 115                 .maximum = 127,
 116                 .step = 1,
 117                 .default_value = 0,
 118                 .flags = 0,
 119         },{
 120                 .id = V4L2_CID_CONTRAST,
 121                 .type = V4L2_CTRL_TYPE_INTEGER,
 122                 .name = "Contrast",
 123                 .minimum = 0x0,
 124                 .maximum = 0x1f,
 125                 .step = 0x1,
 126                 .default_value = 0x10,
 127                 .flags = 0,
 128         },{
 129                 .id = V4L2_CID_SATURATION,
 130                 .type = V4L2_CTRL_TYPE_INTEGER,
 131                 .name = "Saturation",
 132                 .minimum = 0x0,
 133                 .maximum = 0x1f,
 134                 .step = 0x1,
 135                 .default_value = 0x10,
 136                 .flags = 0,
 137         },{
 138                 .id = V4L2_CID_AUDIO_VOLUME,
 139                 .type = V4L2_CTRL_TYPE_INTEGER,
 140                 .name = "Volume",
 141                 .minimum = 0x0,
 142                 .maximum = 0x1f,
 143                 .step = 0x1,
 144                 .default_value = 0x1f,
 145                 .flags = 0,
 146         },{
 147                 .id = V4L2_CID_AUDIO_MUTE,
 148                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 149                 .name = "Mute",
 150                 .minimum = 0,
 151                 .maximum = 1,
 152                 .step = 1,
 153                 .default_value = 1,
 154                 .flags = 0,
 155         },{
 156                 .id = V4L2_CID_RED_BALANCE,
 157                 .type = V4L2_CTRL_TYPE_INTEGER,
 158                 .name = "Red chroma balance",
 159                 .minimum = -128,
 160                 .maximum = 127,
 161                 .step = 1,
 162                 .default_value = 0,
 163                 .flags = 0,
 164         },{
 165                 .id = V4L2_CID_BLUE_BALANCE,
 166                 .type = V4L2_CTRL_TYPE_INTEGER,
 167                 .name = "Blue chroma balance",
 168                 .minimum = -128,
 169                 .maximum = 127,
 170                 .step = 1,
 171                 .default_value = 0,
 172                 .flags = 0,
 173         },{
 174                 .id = V4L2_CID_GAMMA,
 175                 .type = V4L2_CTRL_TYPE_INTEGER,
 176                 .name = "Gamma",
 177                 .minimum = 0x0,
 178                 .maximum = 0x3f,
 179                 .step = 0x1,
 180                 .default_value = 0x20,
 181                 .flags = 0,
 182          }
 183 };
 184
 185 static struct usb_driver em28xx_usb_driver;
 186
 187 static DECLARE_MUTEX(em28xx_sysfs_lock);
 188 static DECLARE_RWSEM(em28xx_disconnect);
 189
 190 /*********************  v4l2 interface  ******************************************/
 191
 192 static inline unsigned long kvirt_to_pa(unsigned long adr)
 193 {
 194         unsigned long kva, ret;
 195
 196         kva = (unsigned long)page_address(vmalloc_to_page((void *)adr));
 197         kva |= adr & (PAGE_SIZE - 1);
 198         ret = __pa(kva);
 199         return ret;
 200 }
 201
 202 /*
 203  * em28xx_config()
 204  * inits registers with sane defaults
 205  */
 206 static int em28xx_config(struct em28xx *dev)
 207 {
 208
 209         /* Sets I2C speed to 100 KHz */
 210         em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 211
 212         /* enable vbi capturing */
 213         em28xx_audio_usb_mute(dev, 1);
 214         dev->mute = 1;          /* maybe not the right place... */
 215         dev->volume = 0x1f;
 216         em28xx_audio_analog_set(dev);
 217         em28xx_audio_analog_setup(dev);
 218         em28xx_outfmt_set_yuv422(dev);
 219         em28xx_colorlevels_set_default(dev);
 220         em28xx_compression_disable(dev);
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * em28xx_config_i2c()
 227  * configure i2c attached devices
 228  */
 229 void em28xx_config_i2c(struct em28xx *dev)
 230 {
 231         struct v4l2_frequency f;
 232         struct video_decoder_init em28xx_vdi = {.data = NULL };
 233
 234
 235         /* configure decoder */
 236         if(dev->model == EM2820_BOARD_MSI_VOX_USB_2){
 237                 em28xx_vdi.data=saa7114_i2c_init;
 238                 em28xx_vdi.len=sizeof(saa7114_i2c_init);
 239         }
 240
 241
 242         em28xx_i2c_call_clients(dev, DECODER_INIT, &em28xx_vdi);
 243         em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &dev->ctl_input);
 244 /*      em28xx_i2c_call_clients(dev,DECODER_SET_PICTURE, &dev->vpic); */
 245 /*      em28xx_i2c_call_clients(dev,DECODER_SET_NORM,&dev->tvnorm->id); */
 246 /*      em28xx_i2c_call_clients(dev,DECODER_ENABLE_OUTPUT,&output); */
 247 /*      em28xx_i2c_call_clients(dev,DECODER_DUMP, NULL); */
 248
 249         /* configure tuner */
 250         f.tuner = 0;
 251         f.type = V4L2_TUNER_ANALOG_TV;
 252         f.frequency = 9076;     /* FIXME:remove magic number */
 253         dev->ctl_freq = f.frequency;
 254         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 255
 256         /* configure tda9887 */
 257
 258
 259 /*      em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
 260 }
 261
 262 /*
 263  * em28xx_empty_framequeues()
 264  * prepare queues for incoming and outgoing frames
 265  */
 266 static void em28xx_empty_framequeues(struct em28xx *dev)
 267 {
 268         u32 i;
 269
 270         INIT_LIST_HEAD(&dev->inqueue);
 271         INIT_LIST_HEAD(&dev->outqueue);
 272
 273         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 274                 dev->frame[i].state = F_UNUSED;
 275                 dev->frame[i].buf.bytesused = 0;
 276         }
 277 }
 278
 279 static void video_mux(struct em28xx *dev, int index)
 280 {
 281         int input, ainput;
 282
 283         input = INPUT(index)->vmux;
 284         dev->ctl_input = index;
 285         dev->ctl_ainput = INPUT(index)->amux;
 286
 287         em28xx_i2c_call_clients(dev, DECODER_SET_INPUT, &input);
 288
 289
 290         em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,input,dev->ctl_ainput);
 291
 292         if (dev->has_msp34xx) {
 293                 em28xx_i2c_call_clients(dev, VIDIOC_S_AUDIO, &dev->ctl_ainput);
 294                 ainput = EM28XX_AUDIO_SRC_TUNER;
 295                 em28xx_audio_source(dev, ainput);
 296         } else {
 297                 switch (dev->ctl_ainput) {
 298                 case 0:
 299                         ainput = EM28XX_AUDIO_SRC_TUNER;
 300                         break;
 301                 default:
 302                         ainput = EM28XX_AUDIO_SRC_LINE;
 303                 }
 304                 em28xx_audio_source(dev, ainput);
 305         }
 306 }
 307
 308 /*
 309  * em28xx_v4l2_open()
 310  * inits the device and starts isoc transfer
 311  */
 312 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 313 {
 314         int minor = iminor(inode);
 315         int errCode = 0;
 316         struct em28xx *h,*dev = NULL;
 317         struct list_head *list;
 318
 319         list_for_each(list,&em28xx_devlist) {
 320                 h = list_entry(list, struct em28xx, devlist);
 321                 if (h->vdev->minor == minor) {
 322                         dev  = h;
 323                 }
 324         }
 325
 326         filp->private_data=dev;
 327
 328
 329         em28xx_videodbg("users=%d\n", dev->users);
 330
 331         if (!down_read_trylock(&em28xx_disconnect))
 332                 return -ERESTARTSYS;
 333
 334         if (dev->users) {
 335                 em28xx_warn("this driver can be opened only once\n");
 336                 up_read(&em28xx_disconnect);
 337                 return -EBUSY;
 338         }
 339
 340 /*      if(dev->vbi_dev->minor == minor){
 341                 dev->type=V4L2_BUF_TYPE_VBI_CAPTURE;
 342         }*/
 343         if (dev->vdev->minor == minor) {
 344                 dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 345         }
 346
 347         init_MUTEX(&dev->fileop_lock);  /* to 1 == available */
 348         spin_lock_init(&dev->queue_lock);
 349         init_waitqueue_head(&dev->wait_frame);
 350         init_waitqueue_head(&dev->wait_stream);
 351
 352         down(&dev->lock);
 353
 354         em28xx_set_alternate(dev);
 355
 356         dev->width = norm_maxw(dev);
 357         dev->height = norm_maxh(dev);
 358         dev->frame_size = dev->width * dev->height * 2;
 359         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 360         dev->bytesperline = dev->width * 2;
 361         dev->hscale = 0;
 362         dev->vscale = 0;
 363
 364         em28xx_capture_start(dev, 1);
 365         em28xx_resolution_set(dev);
 366
 367         /* start the transfer */
 368         errCode = em28xx_init_isoc(dev);
 369         if (errCode)
 370                 goto err;
 371
 372         dev->users++;
 373         filp->private_data = dev;
 374         dev->io = IO_NONE;
 375         dev->stream = STREAM_OFF;
 376         dev->num_frames = 0;
 377
 378         /* prepare queues */
 379         em28xx_empty_framequeues(dev);
 380
 381         dev->state |= DEV_INITIALIZED;
 382
 383         video_mux(dev, 0);
 384
 385       err:
 386         up(&dev->lock);
 387         up_read(&em28xx_disconnect);
 388         return errCode;
 389 }
 390
 391 /*
 392  * em28xx_realease_resources()
 393  * unregisters the v4l2,i2c and usb devices
 394  * called when the device gets disconected or at module unload
 395 */
 396 static void em28xx_release_resources(struct em28xx *dev)
 397 {
 398         down(&em28xx_sysfs_lock);
 399
 400         em28xx_info("V4L2 device /dev/video%d deregistered\n",
 401                     dev->vdev->minor);
 402         list_del(&dev->devlist);
 403         video_unregister_device(dev->vdev);
 404 /*      video_unregister_device(dev->vbi_dev); */
 405         em28xx_i2c_unregister(dev);
 406         usb_put_dev(dev->udev);
 407         up(&em28xx_sysfs_lock);
 408 }
 409
 410 /*
 411  * em28xx_v4l2_close()
 412  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 413  */
 414 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 415 {
 416         int errCode;
 417         struct em28xx *dev=filp->private_data;
 418
 419         em28xx_videodbg("users=%d\n", dev->users);
 420
 421         down(&dev->lock);
 422
 423         em28xx_uninit_isoc(dev);
 424
 425         em28xx_release_buffers(dev);
 426
 427         /* the device is already disconnect, free the remaining resources */
 428         if (dev->state & DEV_DISCONNECTED) {
 429                 em28xx_release_resources(dev);
 430                 up(&dev->lock);
 431                 kfree(dev);
 432                 return 0;
 433         }
 434
 435         /* set alternate 0 */
 436         dev->alt = 0;
 437         em28xx_videodbg("setting alternate 0\n");
 438         errCode = usb_set_interface(dev->udev, 0, 0);
 439         if (errCode < 0) {
 440                 em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
 441                      errCode);
 442         }
 443
 444         dev->users--;
 445         wake_up_interruptible_nr(&dev->open, 1);
 446         up(&dev->lock);
 447         return 0;
 448 }
 449
 450 /*
 451  * em28xx_v4l2_read()
 452  * will allocate buffers when called for the first time
 453  */
 454 static ssize_t
 455 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
 456                  loff_t * f_pos)
 457 {
 458         struct em28xx_frame_t *f, *i;
 459         unsigned long lock_flags;
 460         int ret = 0;
 461         struct em28xx *dev = filp->private_data;
 462
 463         if (down_interruptible(&dev->fileop_lock))
 464                 return -ERESTARTSYS;
 465
 466         if (dev->state & DEV_DISCONNECTED) {
 467                 em28xx_videodbg("device not present\n");
 468                 up(&dev->fileop_lock);
 469                 return -ENODEV;
 470         }
 471
 472         if (dev->state & DEV_MISCONFIGURED) {
 473                 em28xx_videodbg("device misconfigured; close and open it again\n");
 474                 up(&dev->fileop_lock);
 475                 return -EIO;
 476         }
 477
 478         if (dev->io == IO_MMAP) {
 479                 em28xx_videodbg ("IO method is set to mmap; close and open"
 480                                 " the device again to choose the read method\n");
 481                 up(&dev->fileop_lock);
 482                 return -EINVAL;
 483         }
 484
 485         if (dev->io == IO_NONE) {
 486                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
 487                         em28xx_errdev("read failed, not enough memory\n");
 488                         up(&dev->fileop_lock);
 489                         return -ENOMEM;
 490                 }
 491                 dev->io = IO_READ;
 492                 dev->stream = STREAM_ON;
 493                 em28xx_queue_unusedframes(dev);
 494         }
 495
 496         if (!count) {
 497                 up(&dev->fileop_lock);
 498                 return 0;
 499         }
 500
 501         if (list_empty(&dev->outqueue)) {
 502                 if (filp->f_flags & O_NONBLOCK) {
 503                         up(&dev->fileop_lock);
 504                         return -EAGAIN;
 505                 }
 506                 ret = wait_event_interruptible
 507                     (dev->wait_frame,
 508                      (!list_empty(&dev->outqueue)) ||
 509                      (dev->state & DEV_DISCONNECTED));
 510                 if (ret) {
 511                         up(&dev->fileop_lock);
 512                         return ret;
 513                 }
 514                 if (dev->state & DEV_DISCONNECTED) {
 515                         up(&dev->fileop_lock);
 516                         return -ENODEV;
 517                 }
 518         }
 519
 520         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
 521
 522         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 523         list_for_each_entry(i, &dev->outqueue, frame)
 524             i->state = F_UNUSED;
 525         INIT_LIST_HEAD(&dev->outqueue);
 526         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 527
 528         em28xx_queue_unusedframes(dev);
 529
 530         if (count > f->buf.length)
 531                 count = f->buf.length;
 532
 533         if (copy_to_user(buf, f->bufmem, count)) {
 534                 up(&dev->fileop_lock);
 535                 return -EFAULT;
 536         }
 537         *f_pos += count;
 538
 539         up(&dev->fileop_lock);
 540
 541         return count;
 542 }
 543
 544 /*
 545  * em28xx_v4l2_poll()
 546  * will allocate buffers when called for the first time
 547  */
 548 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
 549 {
 550         unsigned int mask = 0;
 551         struct em28xx *dev = filp->private_data;
 552
 553         if (down_interruptible(&dev->fileop_lock))
 554                 return POLLERR;
 555
 556         if (dev->state & DEV_DISCONNECTED) {
 557                 em28xx_videodbg("device not present\n");
 558         } else if (dev->state & DEV_MISCONFIGURED) {
 559                 em28xx_videodbg("device is misconfigured; close and open it again\n");
 560         } else {
 561                 if (dev->io == IO_NONE) {
 562                         if (!em28xx_request_buffers
 563                             (dev, EM28XX_NUM_READ_FRAMES)) {
 564                                 em28xx_warn
 565                                     ("poll() failed, not enough memory\n");
 566                         } else {
 567                                 dev->io = IO_READ;
 568                                 dev->stream = STREAM_ON;
 569                         }
 570                 }
 571
 572                 if (dev->io == IO_READ) {
 573                         em28xx_queue_unusedframes(dev);
 574                         poll_wait(filp, &dev->wait_frame, wait);
 575
 576                         if (!list_empty(&dev->outqueue))
 577                                 mask |= POLLIN | POLLRDNORM;
 578
 579                         up(&dev->fileop_lock);
 580
 581                         return mask;
 582                 }
 583         }
 584
 585         up(&dev->fileop_lock);
 586         return POLLERR;
 587 }
 588
 589 /*
 590  * em28xx_vm_open()
 591  */
 592 static void em28xx_vm_open(struct vm_area_struct *vma)
 593 {
 594         struct em28xx_frame_t *f = vma->vm_private_data;
 595         f->vma_use_count++;
 596 }
 597
 598 /*
 599  * em28xx_vm_close()
 600  */
 601 static void em28xx_vm_close(struct vm_area_struct *vma)
 602 {
 603         /* NOTE: buffers are not freed here */
 604         struct em28xx_frame_t *f = vma->vm_private_data;
 605         f->vma_use_count--;
 606 }
 607
 608 static struct vm_operations_struct em28xx_vm_ops = {
 609         .open = em28xx_vm_open,
 610         .close = em28xx_vm_close,
 611 };
 612
 613 /*
 614  * em28xx_v4l2_mmap()
 615  */
 616 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 617 {
 618         unsigned long size = vma->vm_end - vma->vm_start,
 619             start = vma->vm_start, pos, page;
 620         u32 i;
 621
 622         struct em28xx *dev = filp->private_data;
 623
 624         if (down_interruptible(&dev->fileop_lock))
 625                 return -ERESTARTSYS;
 626
 627         if (dev->state & DEV_DISCONNECTED) {
 628                 em28xx_videodbg("mmap: device not present\n");
 629                 up(&dev->fileop_lock);
 630                 return -ENODEV;
 631         }
 632
 633         if (dev->state & DEV_MISCONFIGURED) {
 634                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
 635                                                 "open it again\n");
 636                 up(&dev->fileop_lock);
 637                 return -EIO;
 638         }
 639
 640         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
 641             size != PAGE_ALIGN(dev->frame[0].buf.length)) {
 642                 up(&dev->fileop_lock);
 643                 return -EINVAL;
 644         }
 645
 646         for (i = 0; i < dev->num_frames; i++) {
 647                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
 648                         break;
 649         }
 650         if (i == dev->num_frames) {
 651                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
 652                 up(&dev->fileop_lock);
 653                 return -EINVAL;
 654         }
 655
 656         /* VM_IO is eventually going to replace PageReserved altogether */
 657         vma->vm_flags |= VM_IO;
 658         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
 659
 660         pos = (unsigned long)dev->frame[i].bufmem;
 661         while (size > 0) {      /* size is page-aligned */
 662                 page = vmalloc_to_pfn((void *)pos);
 663                 if (remap_pfn_range(vma, start, page, PAGE_SIZE,
 664                                     vma->vm_page_prot)) {
 665                         em28xx_videodbg("mmap: rename page map failed\n");
 666                         up(&dev->fileop_lock);
 667                         return -EAGAIN;
 668                 }
 669                 start += PAGE_SIZE;
 670                 pos += PAGE_SIZE;
 671                 size -= PAGE_SIZE;
 672         }
 673
 674         vma->vm_ops = &em28xx_vm_ops;
 675         vma->vm_private_data = &dev->frame[i];
 676
 677         em28xx_vm_open(vma);
 678         up(&dev->fileop_lock);
 679         return 0;
 680 }
 681
 682 /*
 683  * em28xx_get_ctrl()
 684  * return the current saturation, brightness or contrast, mute state
 685  */
 686 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 687 {
 688         s32 tmp;
 689         switch (ctrl->id) {
 690         case V4L2_CID_AUDIO_MUTE:
 691                 ctrl->value = dev->mute;
 692                 return 0;
 693         case V4L2_CID_AUDIO_VOLUME:
 694                 ctrl->value = dev->volume;
 695                 return 0;
 696         case V4L2_CID_BRIGHTNESS:
 697                 if ((tmp = em28xx_brightness_get(dev)) < 0)
 698                         return -EIO;
 699                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 700                 return 0;
 701         case V4L2_CID_CONTRAST:
 702                 if ((ctrl->value = em28xx_contrast_get(dev)) < 0)
 703                         return -EIO;
 704                 return 0;
 705         case V4L2_CID_SATURATION:
 706                 if ((ctrl->value = em28xx_saturation_get(dev)) < 0)
 707                         return -EIO;
 708                 return 0;
 709         case V4L2_CID_RED_BALANCE:
 710                 if ((tmp = em28xx_v_balance_get(dev)) < 0)
 711                         return -EIO;
 712                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 713                 return 0;
 714         case V4L2_CID_BLUE_BALANCE:
 715                 if ((tmp = em28xx_u_balance_get(dev)) < 0)
 716                         return -EIO;
 717                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 718                 return 0;
 719         case V4L2_CID_GAMMA:
 720                 if ((ctrl->value = em28xx_gamma_get(dev)) < 0)
 721                         return -EIO;
 722                 return 0;
 723         default:
 724                 return -EINVAL;
 725         }
 726 }
 727
 728 /*
 729  * em28xx_set_ctrl()
 730  * mute or set new saturation, brightness or contrast
 731  */
 732 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 733 {
 734         switch (ctrl->id) {
 735         case V4L2_CID_AUDIO_MUTE:
 736                 if (ctrl->value != dev->mute) {
 737                         dev->mute = ctrl->value;
 738                         em28xx_audio_usb_mute(dev, ctrl->value);
 739                         return em28xx_audio_analog_set(dev);
 740                 }
 741                 return 0;
 742         case V4L2_CID_AUDIO_VOLUME:
 743                 dev->volume = ctrl->value;
 744                 return em28xx_audio_analog_set(dev);
 745         case V4L2_CID_BRIGHTNESS:
 746                 return em28xx_brightness_set(dev, ctrl->value);
 747         case V4L2_CID_CONTRAST:
 748                 return em28xx_contrast_set(dev, ctrl->value);
 749         case V4L2_CID_SATURATION:
 750                 return em28xx_saturation_set(dev, ctrl->value);
 751         case V4L2_CID_RED_BALANCE:
 752                 return em28xx_v_balance_set(dev, ctrl->value);
 753         case V4L2_CID_BLUE_BALANCE:
 754                 return em28xx_u_balance_set(dev, ctrl->value);
 755         case V4L2_CID_GAMMA:
 756                 return em28xx_gamma_set(dev, ctrl->value);
 757         default:
 758                 return -EINVAL;
 759         }
 760 }
 761
 762 /*
 763  * em28xx_stream_interrupt()
 764  * stops streaming
 765  */
 766 static int em28xx_stream_interrupt(struct em28xx *dev)
 767 {
 768         int ret = 0;
 769
 770         /* stop reading from the device */
 771
 772         dev->stream = STREAM_INTERRUPT;
 773         ret = wait_event_timeout(dev->wait_stream,
 774                                  (dev->stream == STREAM_OFF) ||
 775                                  (dev->state & DEV_DISCONNECTED),
 776                                  EM28XX_URB_TIMEOUT);
 777         if (dev->state & DEV_DISCONNECTED)
 778                 return -ENODEV;
 779         else if (ret) {
 780                 dev->state |= DEV_MISCONFIGURED;
 781                 em28xx_videodbg("device is misconfigured; close and "
 782                         "open /dev/video%d again\n", dev->vdev->minor);
 783                 return ret;
 784         }
 785
 786         return 0;
 787 }
 788
 789 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
 790 {
 791         unsigned int hscale, vscale;
 792         unsigned int maxh, maxw;
 793
 794         maxw = norm_maxw(dev);
 795         maxh = norm_maxh(dev);
 796
 797         /* width must even because of the YUYV format */
 798         /* height must be even because of interlacing */
 799         height &= 0xfffe;
 800         width &= 0xfffe;
 801
 802         if (height < 32)
 803                 height = 32;
 804         if (height > maxh)
 805                 height = maxh;
 806         if (width < 48)
 807                 width = 48;
 808         if (width > maxw)
 809                 width = maxw;
 810
 811         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 812                 hscale = 0x3fff;
 813         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 814
 815         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 816                 vscale = 0x3fff;
 817         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 818
 819         /* set new image size */
 820         dev->width = width;
 821         dev->height = height;
 822         dev->frame_size = dev->width * dev->height * 2;
 823         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 824         dev->bytesperline = dev->width * 2;
 825         dev->hscale = hscale;
 826         dev->vscale = vscale;
 827
 828         em28xx_resolution_set(dev);
 829
 830         return 0;
 831 }
 832
 833 /*
 834  * em28xx_v4l2_do_ioctl()
 835  * This function is _not_ called directly, but from
 836  * em28xx_v4l2_ioctl. Userspace
 837  * copying is done already, arg is a kernel pointer.
 838  */
 839 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
 840                            struct em28xx *dev, unsigned int cmd, void *arg,
 841                            v4l2_kioctl driver_ioctl)
 842 {
 843         int ret;
 844
 845         switch (cmd) {
 846                 /* ---------- tv norms ---------- */
 847         case VIDIOC_ENUMSTD:
 848                 {
 849                         struct v4l2_standard *e = arg;
 850                         unsigned int i;
 851
 852                         i = e->index;
 853                         if (i >= TVNORMS)
 854                                 return -EINVAL;
 855                         ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 856                                                        tvnorms[e->index].name);
 857                         e->index = i;
 858                         if (ret < 0)
 859                                 return ret;
 860                         return 0;
 861                 }
 862         case VIDIOC_G_STD:
 863                 {
 864                         v4l2_std_id *id = arg;
 865
 866                         *id = dev->tvnorm->id;
 867                         return 0;
 868                 }
 869         case VIDIOC_S_STD:
 870                 {
 871                         v4l2_std_id *id = arg;
 872                         unsigned int i;
 873
 874                         for (i = 0; i < TVNORMS; i++)
 875                                 if (*id == tvnorms[i].id)
 876                                         break;
 877                         if (i == TVNORMS)
 878                                 for (i = 0; i < TVNORMS; i++)
 879                                         if (*id & tvnorms[i].id)
 880                                                 break;
 881                         if (i == TVNORMS)
 882                                 return -EINVAL;
 883
 884                         down(&dev->lock);
 885                         dev->tvnorm = &tvnorms[i];
 886
 887                         em28xx_set_norm(dev, dev->width, dev->height);
 888
 889 /*
 890                 dev->width=norm_maxw(dev);
 891                 dev->height=norm_maxh(dev);
 892                 dev->frame_size=dev->width*dev->height*2;
 893                 dev->field_size=dev->frame_size>>1;
 894                 dev->bytesperline=dev->width*2;
 895                 dev->hscale=0;
 896                 dev->vscale=0;
 897
 898                 em28xx_resolution_set(dev);
 899 */
 900 /*
 901                 em28xx_uninit_isoc(dev);
 902                 em28xx_set_alternate(dev);
 903                 em28xx_capture_start(dev, 1);
 904                 em28xx_resolution_set(dev);
 905                 em28xx_init_isoc(dev);
 906 */
 907                         em28xx_i2c_call_clients(dev, DECODER_SET_NORM,
 908                                                 &tvnorms[i].mode);
 909                         em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
 910                                                 &dev->tvnorm->id);
 911
 912                         up(&dev->lock);
 913
 914                         return 0;
 915                 }
 916
 917                 /* ------ input switching ---------- */
 918         case VIDIOC_ENUMINPUT:
 919                 {
 920                         struct v4l2_input *i = arg;
 921                         unsigned int n;
 922                         static const char *iname[] = {
 923                                 [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 924                                 [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 925                                 [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 926                                 [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 927                                 [EM28XX_VMUX_SVIDEO] = "S-Video",
 928                                 [EM28XX_VMUX_TELEVISION] = "Television",
 929                                 [EM28XX_VMUX_CABLE] = "Cable TV",
 930                                 [EM28XX_VMUX_DVB] = "DVB",
 931                                 [EM28XX_VMUX_DEBUG] = "for debug only",
 932                         };
 933
 934                         n = i->index;
 935                         if (n >= MAX_EM28XX_INPUT)
 936                                 return -EINVAL;
 937                         if (0 == INPUT(n)->type)
 938                                 return -EINVAL;
 939                         memset(i, 0, sizeof(*i));
 940                         i->index = n;
 941                         i->type = V4L2_INPUT_TYPE_CAMERA;
 942                         strcpy(i->name, iname[INPUT(n)->type]);
 943                         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 944                             (EM28XX_VMUX_CABLE == INPUT(n)->type))
 945                                 i->type = V4L2_INPUT_TYPE_TUNER;
 946                         for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
 947                                 i->std |= tvnorms[n].id;
 948                         return 0;
 949                 }
 950
 951         case VIDIOC_G_INPUT:
 952                 {
 953                         int *i = arg;
 954                         *i = dev->ctl_input;
 955
 956                         return 0;
 957                 }
 958
 959         case VIDIOC_S_INPUT:
 960                 {
 961                         int *index = arg;
 962
 963                         if (*index >= MAX_EM28XX_INPUT)
 964                                 return -EINVAL;
 965                         if (0 == INPUT(*index)->type)
 966                                 return -EINVAL;
 967
 968                         down(&dev->lock);
 969                         video_mux(dev, *index);
 970                         up(&dev->lock);
 971
 972                         return 0;
 973                 }
 974
 975         case VIDIOC_G_AUDIO:
 976                 {
 977                         struct v4l2_audio *a = arg;
 978                         unsigned int index = a->index;
 979
 980                         if (a->index > 1)
 981                                 return -EINVAL;
 982                         memset(a, 0, sizeof(*a));
 983                         index = dev->ctl_ainput;
 984
 985                         if (index == 0) {
 986                                 strcpy(a->name, "Television");
 987                         } else {
 988                                 strcpy(a->name, "Line In");
 989                         }
 990                         a->capability = V4L2_AUDCAP_STEREO;
 991                         a->index = index;
 992                         return 0;
 993                 }
 994
 995         case VIDIOC_S_AUDIO:
 996                 {
 997                         struct v4l2_audio *a = arg;
 998                         if (a->index != dev->ctl_ainput)
 999                                 return -EINVAL;
1000
1001                         return 0;
1002                 }
1003
1004                 /* --- controls ---------------------------------------------- */
1005         case VIDIOC_QUERYCTRL:
1006                 {
1007                         struct v4l2_queryctrl *qc = arg;
1008                         u8 i, n;
1009                         n = sizeof(em28xx_qctrl) / sizeof(em28xx_qctrl[0]);
1010                         for (i = 0; i < n; i++)
1011                                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1012                                         memcpy(qc, &(em28xx_qctrl[i]),
1013                                                sizeof(*qc));
1014                                         return 0;
1015                                 }
1016
1017                         return -EINVAL;
1018                 }
1019
1020         case VIDIOC_G_CTRL:
1021                 {
1022                         struct v4l2_control *ctrl = arg;
1023
1024
1025                         return em28xx_get_ctrl(dev, ctrl);
1026                 }
1027
1028         case VIDIOC_S_CTRL_OLD: /* ??? */
1029         case VIDIOC_S_CTRL:
1030                 {
1031                         struct v4l2_control *ctrl = arg;
1032                         u8 i, n;
1033
1034
1035                         n = sizeof(em28xx_qctrl) / sizeof(em28xx_qctrl[0]);
1036                         for (i = 0; i < n; i++)
1037                                 if (ctrl->id == em28xx_qctrl[i].id) {
1038                                         if (ctrl->value <
1039                                             em28xx_qctrl[i].minimum
1040                                             || ctrl->value >
1041                                             em28xx_qctrl[i].maximum)
1042                                                 return -ERANGE;
1043
1044                                         return em28xx_set_ctrl(dev, ctrl);
1045                                 }
1046                         return -EINVAL;
1047                 }
1048
1049                 /* --- tuner ioctls ------------------------------------------ */
1050         case VIDIOC_G_TUNER:
1051                 {
1052                         struct v4l2_tuner *t = arg;
1053                         int status = 0;
1054
1055                         if (0 != t->index)
1056                                 return -EINVAL;
1057
1058                         memset(t, 0, sizeof(*t));
1059                         strcpy(t->name, "Tuner");
1060                         t->type = V4L2_TUNER_ANALOG_TV;
1061                         t->capability = V4L2_TUNER_CAP_NORM;
1062                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1063 /*              t->signal = 0xffff;*/
1064 /*              em28xx_i2c_call_clients(dev,VIDIOC_G_TUNER,t);*/
1065                         /* No way to get signal strength? */
1066                         down(&dev->lock);
1067                         em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
1068                                                 &status);
1069                         up(&dev->lock);
1070                         t->signal =
1071                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1072
1073                         em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
1074                                  t->afc);
1075                         return 0;
1076                 }
1077         case VIDIOC_S_TUNER:
1078                 {
1079                         struct v4l2_tuner *t = arg;
1080                         int status = 0;
1081
1082                         if (0 != t->index)
1083                                 return -EINVAL;
1084                         memset(t, 0, sizeof(*t));
1085                         strcpy(t->name, "Tuner");
1086                         t->type = V4L2_TUNER_ANALOG_TV;
1087                         t->capability = V4L2_TUNER_CAP_NORM;
1088                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1089 /*              t->signal = 0xffff; */
1090                         /* No way to get signal strength? */
1091                         down(&dev->lock);
1092                         em28xx_i2c_call_clients(dev, DECODER_GET_STATUS,
1093                                                 &status);
1094                         up(&dev->lock);
1095                         t->signal =
1096                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1097
1098                         em28xx_videodbg("VIDIO_S_TUNER: signal=%x, afc=%x\n",
1099                                  t->signal, t->afc);
1100                         return 0;
1101                 }
1102         case VIDIOC_G_FREQUENCY:
1103                 {
1104                         struct v4l2_frequency *f = arg;
1105
1106                         memset(f, 0, sizeof(*f));
1107                         f->type = V4L2_TUNER_ANALOG_TV;
1108                         f->frequency = dev->ctl_freq;
1109
1110                         return 0;
1111                 }
1112         case VIDIOC_S_FREQUENCY:
1113                 {
1114                         struct v4l2_frequency *f = arg;
1115
1116                         if (0 != f->tuner)
1117                                 return -EINVAL;
1118
1119                         if (V4L2_TUNER_ANALOG_TV != f->type)
1120                                 return -EINVAL;
1121
1122                         down(&dev->lock);
1123                         dev->ctl_freq = f->frequency;
1124                         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1125                         up(&dev->lock);
1126                         return 0;
1127                 }
1128
1129         case VIDIOC_CROPCAP:
1130                 {
1131                         struct v4l2_cropcap *cc = arg;
1132
1133                         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1134                                 return -EINVAL;
1135                         cc->bounds.left = 0;
1136                         cc->bounds.top = 0;
1137                         cc->bounds.width = dev->width;
1138                         cc->bounds.height = dev->height;
1139                         cc->defrect = cc->bounds;
1140                         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1141                         cc->pixelaspect.denominator = 59;
1142                         return 0;
1143                 }
1144         case VIDIOC_STREAMON:
1145                 {
1146                         int *type = arg;
1147
1148                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1149                             || dev->io != IO_MMAP)
1150                                 return -EINVAL;
1151
1152                         if (list_empty(&dev->inqueue))
1153                                 return -EINVAL;
1154
1155                         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1156
1157                         em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");
1158
1159                         return 0;
1160                 }
1161         case VIDIOC_STREAMOFF:
1162                 {
1163                         int *type = arg;
1164                         int ret;
1165
1166                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1167                             || dev->io != IO_MMAP)
1168                                 return -EINVAL;
1169
1170                         if (dev->stream == STREAM_ON) {
1171                                 em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
1172                                 if ((ret = em28xx_stream_interrupt(dev)))
1173                                         return ret;
1174                         }
1175                         em28xx_empty_framequeues(dev);
1176
1177                         return 0;
1178                 }
1179         default:
1180                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1181                                                   driver_ioctl);
1182         }
1183         return 0;
1184 }
1185
1186 /*
1187  * em28xx_v4l2_do_ioctl()
1188  * This function is _not_ called directly, but from
1189  * em28xx_v4l2_ioctl. Userspace
1190  * copying is done already, arg is a kernel pointer.
1191  */
1192 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1193                                  unsigned int cmd, void *arg)
1194 {
1195         struct em28xx *dev = filp->private_data;
1196
1197         if (!dev)
1198                 return -ENODEV;
1199
1200         if (video_debug > 1)
1201                 em28xx_print_ioctl(dev->name,cmd);
1202
1203         switch (cmd) {
1204
1205                 /* --- capabilities ------------------------------------------ */
1206         case VIDIOC_QUERYCAP:
1207                 {
1208                         struct v4l2_capability *cap = arg;
1209
1210                         memset(cap, 0, sizeof(*cap));
1211                         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1212                         strlcpy(cap->card, em28xx_boards[dev->model].name,
1213                                 sizeof(cap->card));
1214                         strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1215                                 sizeof(cap->bus_info));
1216                         cap->version = EM28XX_VERSION_CODE;
1217                         cap->capabilities =
1218                             V4L2_CAP_VIDEO_CAPTURE |
1219                             V4L2_CAP_AUDIO |
1220                             V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1221                         if (dev->has_tuner)
1222                                 cap->capabilities |= V4L2_CAP_TUNER;
1223                         return 0;
1224                 }
1225
1226                 /* --- capture ioctls ---------------------------------------- */
1227         case VIDIOC_ENUM_FMT:
1228                 {
1229                         struct v4l2_fmtdesc *fmtd = arg;
1230
1231                         if (fmtd->index != 0)
1232                                 return -EINVAL;
1233                         memset(fmtd, 0, sizeof(*fmtd));
1234                         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1235                         strcpy(fmtd->description, "Packed YUY2");
1236                         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1237                         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1238                         return 0;
1239                 }
1240
1241         case VIDIOC_G_FMT:
1242                 {
1243                         struct v4l2_format *format = arg;
1244
1245                         em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
1246                                  format->type ==
1247                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1248                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1249                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1250                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1251                                  "not supported");
1252
1253                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1254                                 return -EINVAL;
1255
1256                         format->fmt.pix.width = dev->width;
1257                         format->fmt.pix.height = dev->height;
1258                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1259                         format->fmt.pix.bytesperline = dev->bytesperline;
1260                         format->fmt.pix.sizeimage = dev->frame_size;
1261                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1262                         format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
1263
1264                         em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
1265                                  dev->height);
1266                         return 0;
1267                 }
1268
1269         case VIDIOC_TRY_FMT:
1270         case VIDIOC_S_FMT:
1271                 {
1272                         struct v4l2_format *format = arg;
1273                         u32 i;
1274                         int ret = 0;
1275                         int width = format->fmt.pix.width;
1276                         int height = format->fmt.pix.height;
1277                         unsigned int hscale, vscale;
1278                         unsigned int maxh, maxw;
1279
1280                         maxw = norm_maxw(dev);
1281                         maxh = norm_maxh(dev);
1282
1283 /*              int both_fields; */
1284
1285                         em28xx_videodbg("%s: type=%s\n",
1286                                  cmd ==
1287                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1288                                  "VIDIOC_S_FMT",
1289                                  format->type ==
1290                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1291                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1292                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1293                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1294                                  "not supported");
1295
1296                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1297                                 return -EINVAL;
1298
1299                         em28xx_videodbg("%s: requested %dx%d\n",
1300                                  cmd ==
1301                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1302                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1303                                  format->fmt.pix.height);
1304
1305                         /* FIXME: Move some code away from here */
1306                         /* width must even because of the YUYV format */
1307                         /* height must be even because of interlacing */
1308                         height &= 0xfffe;
1309                         width &= 0xfffe;
1310
1311                         if (height < 32)
1312                                 height = 32;
1313                         if (height > maxh)
1314                                 height = maxh;
1315                         if (width < 48)
1316                                 width = 48;
1317                         if (width > maxw)
1318                                 width = maxw;
1319
1320                         if(dev->is_em2800){
1321                                 /* the em2800 can only scale down to 50% */
1322                                 if(height % (maxh / 2))
1323                                         height=maxh;
1324                                 if(width % (maxw / 2))
1325                                         width=maxw;
1326                                 /* according to empiatech support */
1327                                 /* the MaxPacketSize is to small to support */
1328                                 /* framesizes larger than 640x480 @ 30 fps */
1329                                 /* or 640x576 @ 25 fps. As this would cut */
1330                                 /* of a part of the image we prefer */
1331                                 /* 360x576 or 360x480 for now */
1332                                 if(width == maxw && height == maxh)
1333                                         width /= 2;
1334                         }
1335
1336                         if ((hscale =
1337                              (((unsigned long)maxw) << 12) / width - 4096L) >=
1338                             0x4000)
1339                                 hscale = 0x3fff;
1340                         width =
1341                             (((unsigned long)maxw) << 12) / (hscale + 4096L);
1342
1343                         if ((vscale =
1344                              (((unsigned long)maxh) << 12) / height - 4096L) >=
1345                             0x4000)
1346                                 vscale = 0x3fff;
1347                         height =
1348                             (((unsigned long)maxh) << 12) / (vscale + 4096L);
1349
1350                         format->fmt.pix.width = width;
1351                         format->fmt.pix.height = height;
1352                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1353                         format->fmt.pix.bytesperline = width * 2;
1354                         format->fmt.pix.sizeimage = width * 2 * height;
1355                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1356                         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
1357
1358                         em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
1359                                  cmd ==
1360                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1361                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1362                                  format->fmt.pix.height, hscale, vscale);
1363
1364                         if (cmd == VIDIOC_TRY_FMT)
1365                                 return 0;
1366
1367                         for (i = 0; i < dev->num_frames; i++)
1368                                 if (dev->frame[i].vma_use_count) {
1369                                         em28xx_videodbg("VIDIOC_S_FMT failed. "
1370                                                 "Unmap the buffers first.\n");
1371                                         return -EINVAL;
1372                                 }
1373
1374                         /* stop io in case it is already in progress */
1375                         if (dev->stream == STREAM_ON) {
1376                                 em28xx_videodbg("VIDIOC_SET_FMT: interupting stream\n");
1377                                 if ((ret = em28xx_stream_interrupt(dev)))
1378                                         return ret;
1379                         }
1380
1381                         em28xx_release_buffers(dev);
1382                         dev->io = IO_NONE;
1383
1384                         /* set new image size */
1385                         dev->width = width;
1386                         dev->height = height;
1387                         dev->frame_size = dev->width * dev->height * 2;
1388                         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1389                         dev->bytesperline = dev->width * 2;
1390                         dev->hscale = hscale;
1391                         dev->vscale = vscale;
1392 /*                      dev->both_fileds = both_fileds; */
1393                         em28xx_uninit_isoc(dev);
1394                         em28xx_set_alternate(dev);
1395                         em28xx_capture_start(dev, 1);
1396                         em28xx_resolution_set(dev);
1397                         em28xx_init_isoc(dev);
1398
1399                         return 0;
1400                 }
1401
1402                 /* --- streaming capture ------------------------------------- */
1403         case VIDIOC_REQBUFS:
1404                 {
1405                         struct v4l2_requestbuffers *rb = arg;
1406                         u32 i;
1407                         int ret;
1408
1409                         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1410                             rb->memory != V4L2_MEMORY_MMAP)
1411                                 return -EINVAL;
1412
1413                         if (dev->io == IO_READ) {
1414                                 em28xx_videodbg ("method is set to read;"
1415                                         " close and open the device again to"
1416                                         " choose the mmap I/O method\n");
1417                                 return -EINVAL;
1418                         }
1419
1420                         for (i = 0; i < dev->num_frames; i++)
1421                                 if (dev->frame[i].vma_use_count) {
1422                                         em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
1423                                         return -EINVAL;
1424                                 }
1425
1426                         if (dev->stream == STREAM_ON) {
1427                                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1428                                 if ((ret = em28xx_stream_interrupt(dev)))
1429                                         return ret;
1430                         }
1431
1432                         em28xx_empty_framequeues(dev);
1433
1434                         em28xx_release_buffers(dev);
1435                         if (rb->count)
1436                                 rb->count =
1437                                     em28xx_request_buffers(dev, rb->count);
1438
1439                         dev->frame_current = NULL;
1440
1441                         em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
1442                                                      rb->count);
1443                         dev->io = rb->count ? IO_MMAP : IO_NONE;
1444                         return 0;
1445                 }
1446
1447         case VIDIOC_QUERYBUF:
1448                 {
1449                         struct v4l2_buffer *b = arg;
1450
1451                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1452                             b->index >= dev->num_frames || dev->io != IO_MMAP)
1453                                 return -EINVAL;
1454
1455                         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1456
1457                         if (dev->frame[b->index].vma_use_count) {
1458                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1459                         }
1460                         if (dev->frame[b->index].state == F_DONE)
1461                                 b->flags |= V4L2_BUF_FLAG_DONE;
1462                         else if (dev->frame[b->index].state != F_UNUSED)
1463                                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1464                         return 0;
1465                 }
1466         case VIDIOC_QBUF:
1467                 {
1468                         struct v4l2_buffer *b = arg;
1469                         unsigned long lock_flags;
1470
1471                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1472                             b->index >= dev->num_frames || dev->io != IO_MMAP) {
1473                                 return -EINVAL;
1474                         }
1475
1476                         if (dev->frame[b->index].state != F_UNUSED) {
1477                                 return -EAGAIN;
1478                         }
1479                         dev->frame[b->index].state = F_QUEUED;
1480
1481                         /* add frame to fifo */
1482                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1483                         list_add_tail(&dev->frame[b->index].frame,
1484                                       &dev->inqueue);
1485                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1486
1487                         return 0;
1488                 }
1489         case VIDIOC_DQBUF:
1490                 {
1491                         struct v4l2_buffer *b = arg;
1492                         struct em28xx_frame_t *f;
1493                         unsigned long lock_flags;
1494                         int ret = 0;
1495
1496                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1497                             || dev->io != IO_MMAP)
1498                                 return -EINVAL;
1499
1500                         if (list_empty(&dev->outqueue)) {
1501                                 if (dev->stream == STREAM_OFF)
1502                                         return -EINVAL;
1503                                 if (filp->f_flags & O_NONBLOCK)
1504                                         return -EAGAIN;
1505                                 ret = wait_event_interruptible
1506                                     (dev->wait_frame,
1507                                      (!list_empty(&dev->outqueue)) ||
1508                                      (dev->state & DEV_DISCONNECTED));
1509                                 if (ret)
1510                                         return ret;
1511                                 if (dev->state & DEV_DISCONNECTED)
1512                                         return -ENODEV;
1513                         }
1514
1515                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1516                         f = list_entry(dev->outqueue.next,
1517                                        struct em28xx_frame_t, frame);
1518                         list_del(dev->outqueue.next);
1519                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1520
1521                         f->state = F_UNUSED;
1522                         memcpy(b, &f->buf, sizeof(*b));
1523
1524                         if (f->vma_use_count)
1525                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1526
1527                         return 0;
1528                 }
1529         default:
1530                 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1531                                        em28xx_video_do_ioctl);
1532         }
1533         return 0;
1534 }
1535
1536 /*
1537  * em28xx_v4l2_ioctl()
1538  * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1539  */
1540 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1541                              unsigned int cmd, unsigned long arg)
1542 {
1543         int ret = 0;
1544         struct em28xx *dev = filp->private_data;
1545
1546         if (down_interruptible(&dev->fileop_lock))
1547                 return -ERESTARTSYS;
1548
1549         if (dev->state & DEV_DISCONNECTED) {
1550                 em28xx_errdev("v4l2 ioctl: device not present\n");
1551                 up(&dev->fileop_lock);
1552                 return -ENODEV;
1553         }
1554
1555         if (dev->state & DEV_MISCONFIGURED) {
1556                 em28xx_errdev
1557                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1558                 up(&dev->fileop_lock);
1559                 return -EIO;
1560         }
1561
1562         ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1563
1564         up(&dev->fileop_lock);
1565
1566         return ret;
1567 }
1568
1569 static struct file_operations em28xx_v4l_fops = {
1570         .owner = THIS_MODULE,
1571         .open = em28xx_v4l2_open,
1572         .release = em28xx_v4l2_close,
1573         .ioctl = em28xx_v4l2_ioctl,
1574         .read = em28xx_v4l2_read,
1575         .poll = em28xx_v4l2_poll,
1576         .mmap = em28xx_v4l2_mmap,
1577         .llseek = no_llseek,
1578 };
1579
1580 /******************************** usb interface *****************************************/
1581
1582 /*
1583  * em28xx_init_dev()
1584  * allocates and inits the device structs, registers i2c bus and v4l device
1585  */
1586 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1587                            int minor, int model)
1588 {
1589         struct em28xx *dev = *devhandle;
1590         int retval = -ENOMEM;
1591         int errCode, i;
1592         unsigned int maxh, maxw;
1593
1594         dev->udev = udev;
1595         dev->model = model;
1596         init_MUTEX(&dev->lock);
1597         init_waitqueue_head(&dev->open);
1598
1599         dev->em28xx_write_regs = em28xx_write_regs;
1600         dev->em28xx_read_reg = em28xx_read_reg;
1601         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1602         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1603         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1604         dev->is_em2800 = em28xx_boards[model].is_em2800;
1605         dev->has_tuner = em28xx_boards[model].has_tuner;
1606         dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
1607         dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
1608         dev->decoder = em28xx_boards[model].decoder;
1609
1610         if (tuner >= 0)
1611                 dev->tuner_type = tuner;
1612         else
1613                 dev->tuner_type = em28xx_boards[model].tuner_type;
1614
1615         dev->video_inputs = em28xx_boards[model].vchannels;
1616
1617         for (i = 0; i < TVNORMS; i++)
1618                 if (em28xx_boards[model].norm == tvnorms[i].mode)
1619                         break;
1620         if (i == TVNORMS)
1621                 i = 0;
1622
1623         dev->tvnorm = &tvnorms[i];      /* set default norm */
1624
1625         em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1626
1627         maxw = norm_maxw(dev);
1628         maxh = norm_maxh(dev);
1629
1630         /* set default image size */
1631         dev->width = maxw;
1632         dev->height = maxh;
1633         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1634         dev->field_size = dev->width * dev->height;
1635         dev->frame_size =
1636             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1637         dev->bytesperline = dev->width * 2;
1638         dev->hscale = 0;
1639         dev->vscale = 0;
1640         dev->ctl_input = 2;
1641
1642         /* setup video picture settings for saa7113h */
1643         memset(&dev->vpic, 0, sizeof(dev->vpic));
1644         dev->vpic.colour = 128 << 8;
1645         dev->vpic.hue = 128 << 8;
1646         dev->vpic.brightness = 128 << 8;
1647         dev->vpic.contrast = 192 << 8;
1648         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1649         dev->vpic.depth = 16;
1650         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1651
1652 #ifdef CONFIG_MODULES
1653         /* request some modules */
1654         if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
1655                 request_module("saa711x");
1656         if (dev->decoder == EM28XX_TVP5150)
1657                 request_module("tvp5150");
1658         if (dev->has_tuner)
1659                 request_module("tuner");
1660         if (dev->tda9887_conf)
1661                 request_module("tda9887");
1662 #endif
1663         errCode = em28xx_config(dev);
1664         if (errCode) {
1665                 em28xx_errdev("error configuring device\n");
1666                 kfree(dev);
1667                 return -ENOMEM;
1668         }
1669
1670         down(&dev->lock);
1671         /* register i2c bus */
1672         em28xx_i2c_register(dev);
1673
1674         /* Do board specific init and eeprom reading */
1675         em28xx_card_setup(dev);
1676
1677         /* configure the device */
1678         em28xx_config_i2c(dev);
1679
1680         up(&dev->lock);
1681
1682         errCode = em28xx_config(dev);
1683
1684 #ifdef CONFIG_MODULES
1685         if (dev->has_msp34xx)
1686                 request_module("msp3400");
1687 #endif
1688         /* allocate and fill v4l2 device struct */
1689         dev->vdev = video_device_alloc();
1690         if (NULL == dev->vdev) {
1691                 em28xx_errdev("cannot allocate video_device.\n");
1692                 kfree(dev);
1693                 return -ENOMEM;
1694         }
1695
1696         dev->vdev->type = VID_TYPE_CAPTURE;
1697         if (dev->has_tuner)
1698                 dev->vdev->type |= VID_TYPE_TUNER;
1699         dev->vdev->hardware = 0;
1700         dev->vdev->fops = &em28xx_v4l_fops;
1701         dev->vdev->minor = -1;
1702         dev->vdev->dev = &dev->udev->dev;
1703         dev->vdev->release = video_device_release;
1704         snprintf(dev->vdev->name, sizeof(dev->vdev->name), "%s",
1705                  "em28xx video");
1706         list_add_tail(&dev->devlist,&em28xx_devlist);
1707
1708         /* register v4l2 device */
1709         down(&dev->lock);
1710         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER, -1))) {
1711                 em28xx_errdev("unable to register video device (error=%i).\n",
1712                               retval);
1713                 up(&dev->lock);
1714                 list_del(&dev->devlist);
1715                 video_device_release(dev->vdev);
1716                 kfree(dev);
1717                 return -ENODEV;
1718         }
1719         if (dev->has_msp34xx) {
1720                 /* Send a reset to other chips via gpio */
1721                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1722                 udelay(2500);
1723                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1724                 udelay(2500);
1725
1726         }
1727         video_mux(dev, 0);
1728
1729         up(&dev->lock);
1730
1731         em28xx_info("V4L2 device registered as /dev/video%d\n",
1732                     dev->vdev->minor);
1733
1734         return 0;
1735 }
1736
1737 /*
1738  * em28xx_usb_probe()
1739  * checks for supported devices
1740  */
1741 static int em28xx_usb_probe(struct usb_interface *interface,
1742                             const struct usb_device_id *id)
1743 {
1744         const struct usb_endpoint_descriptor *endpoint;
1745         struct usb_device *udev;
1746         struct usb_interface *uif;
1747         struct em28xx *dev = NULL;
1748         int retval = -ENODEV;
1749         int model,i,nr,ifnum;
1750
1751         udev = usb_get_dev(interface_to_usbdev(interface));
1752         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1753
1754
1755         /* Don't register audio interfaces */
1756         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1757                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1758                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1759                                 ifnum,
1760                                 interface->altsetting[0].desc.bInterfaceClass);
1761                 return -ENODEV;
1762         }
1763
1764         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1765                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1766                         ifnum,
1767                         interface->altsetting[0].desc.bInterfaceClass);
1768
1769         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1770
1771         /* check if the the device has the iso in endpoint at the correct place */
1772         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1773             USB_ENDPOINT_XFER_ISOC) {
1774                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1775                 return -ENODEV;
1776         }
1777         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1778                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1779                 return -ENODEV;
1780         }
1781
1782         model=id->driver_info;
1783         nr=interface->minor;
1784
1785         if (nr>EM28XX_MAXBOARDS) {
1786                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1787                 return -ENOMEM;
1788         }
1789
1790         /* allocate memory for our device state and initialize it */
1791         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1792         if (dev == NULL) {
1793                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1794                 return -ENOMEM;
1795         }
1796         memset(dev, 0, sizeof(*dev));
1797
1798         /* compute alternate max packet sizes */
1799         uif = udev->actconfig->interface[0];
1800
1801         dev->num_alt=uif->num_altsetting;
1802         printk(DRIVER_NAME ": Alternate settings: %i\n",dev->num_alt);
1803 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1804         dev->alt_max_pkt_size = kmalloc(32*
1805                                                 dev->num_alt,GFP_KERNEL);
1806         if (dev->alt_max_pkt_size == NULL) {
1807                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1808                 return -ENOMEM;
1809         }
1810
1811         for (i = 0; i < dev->num_alt ; i++) {
1812                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1813                                                         wMaxPacketSize);
1814                 dev->alt_max_pkt_size[i] =
1815                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1816                 printk(DRIVER_NAME ": Alternate setting %i, max size= %i\n",i,
1817                                                         dev->alt_max_pkt_size[i]);
1818         }
1819
1820         snprintf(dev->name, 29, "em28xx #%d", nr);
1821
1822         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1823                 model=card[nr];
1824
1825         if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
1826                 printk( "%s: Your board has no eeprom inside it and thus can't\n"
1827                         "%s: be autodetected.  Please pass card=<n> insmod option to\n"
1828                         "%s: workaround that.  Redirect complaints to the vendor of\n"
1829                         "%s: the TV card.  Best regards,\n"
1830                         "%s:         -- tux\n",
1831                         dev->name,dev->name,dev->name,dev->name,dev->name);
1832                 printk("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
1833                         dev->name);
1834                 for (i = 0; i < em28xx_bcount; i++) {
1835                         printk("%s:    card=%d -> %s\n",
1836                                 dev->name, i, em28xx_boards[i].name);
1837                 }
1838         }
1839
1840         /* allocate device struct */
1841         retval = em28xx_init_dev(&dev, udev, nr, model);
1842         if (retval)
1843                 return retval;
1844
1845         em28xx_info("Found %s\n", em28xx_boards[model].name);
1846
1847         /* save our data pointer in this interface device */
1848         usb_set_intfdata(interface, dev);
1849         return 0;
1850 }
1851
1852 /*
1853  * em28xx_usb_disconnect()
1854  * called when the device gets diconencted
1855  * video device will be unregistered on v4l2_close in case it is still open
1856  */
1857 static void em28xx_usb_disconnect(struct usb_interface *interface)
1858 {
1859         struct em28xx *dev = usb_get_intfdata(interface);
1860         usb_set_intfdata(interface, NULL);
1861
1862         if (!dev)
1863                 return;
1864
1865         down_write(&em28xx_disconnect);
1866
1867         down(&dev->lock);
1868
1869         em28xx_info("disconnecting %s\n", dev->vdev->name);
1870
1871         wake_up_interruptible_all(&dev->open);
1872
1873         if (dev->users) {
1874                 em28xx_warn
1875                     ("device /dev/video%d is open! Deregistration and memory "
1876                      "deallocation are deferred on close.\n", dev->vdev->minor);
1877                 dev->state |= DEV_MISCONFIGURED;
1878                 em28xx_uninit_isoc(dev);
1879                 dev->state |= DEV_DISCONNECTED;
1880                 wake_up_interruptible(&dev->wait_frame);
1881                 wake_up_interruptible(&dev->wait_stream);
1882         } else {
1883                 dev->state |= DEV_DISCONNECTED;
1884                 em28xx_release_resources(dev);
1885         }
1886
1887         up(&dev->lock);
1888
1889         if (!dev->users) {
1890                 kfree(dev->alt_max_pkt_size);
1891                 kfree(dev);
1892         }
1893
1894         up_write(&em28xx_disconnect);
1895 }
1896
1897 static struct usb_driver em28xx_usb_driver = {
1898         .owner = THIS_MODULE,
1899         .name = "em28xx",
1900         .probe = em28xx_usb_probe,
1901         .disconnect = em28xx_usb_disconnect,
1902         .id_table = em28xx_id_table,
1903 };
1904
1905 static int __init em28xx_module_init(void)
1906 {
1907         int result;
1908
1909         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1910                (EM28XX_VERSION_CODE >> 16) & 0xff,
1911                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1912 #ifdef SNAPSHOT
1913         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1914                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1915 #endif
1916
1917         /* register this driver with the USB subsystem */
1918         result = usb_register(&em28xx_usb_driver);
1919         if (result)
1920                 em28xx_err(DRIVER_NAME
1921                            " usb_register failed. Error number %d.\n", result);
1922
1923         return result;
1924 }
1925
1926 static void __exit em28xx_module_exit(void)
1927 {
1928         /* deregister this driver with the USB subsystem */
1929         usb_deregister(&em28xx_usb_driver);
1930 }
1931
1932 module_init(em28xx_module_init);
1933 module_exit(em28xx_module_exit);