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
  32 #include "em28xx.h"
  33 #include <media/tuner.h>
  34
  35 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  36                       "Markus Rechberger <mrechberger@gmail.com>, " \
  37                       "Mauro Carvalho Chehab <mchehab@brturbo.com.br>, " \
  38                       "Sascha Sommer <saschasommer@freenet.de>"
  39
  40 #define DRIVER_NAME         "em28xx"
  41 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  42 #define EM2820_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
  43
  44 #define em2820_videodbg(fmt, arg...) do {\
  45         if (video_debug) \
  46                 printk(KERN_INFO "%s %s :"fmt, \
  47                          dev->name, __FUNCTION__ , ##arg); } while (0)
  48
  49 MODULE_AUTHOR(DRIVER_AUTHOR);
  50 MODULE_DESCRIPTION(DRIVER_DESC);
  51 MODULE_LICENSE("GPL");
  52
  53 static LIST_HEAD(em2820_devlist);
  54
  55 static unsigned int card[]  = {[0 ... (EM2820_MAXBOARDS - 1)] = UNSET };
  56
  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 em2820_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 em2820_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 em2820_usb_driver;
 186
 187 static DECLARE_MUTEX(em2820_sysfs_lock);
 188 static DECLARE_RWSEM(em2820_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  * em2820_config()
 204  * inits registers with sane defaults
 205  */
 206 static int em2820_config(struct em2820 *dev)
 207 {
 208
 209         /* Sets I2C speed to 100 KHz */
 210         em2820_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 211
 212         /* enable vbi capturing */
 213         em2820_audio_usb_mute(dev, 1);
 214         dev->mute = 1;          /* maybe not the right place... */
 215         dev->volume = 0x1f;
 216         em2820_audio_analog_set(dev);
 217         em2820_audio_analog_setup(dev);
 218         em2820_outfmt_set_yuv422(dev);
 219         em2820_colorlevels_set_default(dev);
 220         em2820_compression_disable(dev);
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * em2820_config_i2c()
 227  * configure i2c attached devices
 228  */
 229 void em2820_config_i2c(struct em2820 *dev)
 230 {
 231         struct v4l2_frequency f;
 232         struct video_decoder_init em2820_vdi = {.data = NULL };
 233
 234
 235         /* configure decoder */
 236         if(dev->model == EM2820_BOARD_MSI_VOX_USB_2){
 237                 em2820_vdi.data=saa7114_i2c_init;
 238                 em2820_vdi.len=sizeof(saa7114_i2c_init);
 239         }
 240
 241
 242         em2820_i2c_call_clients(dev, DECODER_INIT, &em2820_vdi);
 243         em2820_i2c_call_clients(dev, DECODER_SET_INPUT, &dev->ctl_input);
 244 /*      em2820_i2c_call_clients(dev,DECODER_SET_PICTURE, &dev->vpic); */
 245 /*      em2820_i2c_call_clients(dev,DECODER_SET_NORM,&dev->tvnorm->id); */
 246 /*      em2820_i2c_call_clients(dev,DECODER_ENABLE_OUTPUT,&output); */
 247 /*      em2820_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         em2820_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 255
 256         /* configure tda9887 */
 257
 258
 259 /*      em2820_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
 260 }
 261
 262 /*
 263  * em2820_empty_framequeues()
 264  * prepare queues for incoming and outgoing frames
 265  */
 266 static void em2820_empty_framequeues(struct em2820 *dev)
 267 {
 268         u32 i;
 269
 270         INIT_LIST_HEAD(&dev->inqueue);
 271         INIT_LIST_HEAD(&dev->outqueue);
 272
 273         for (i = 0; i < EM2820_NUM_FRAMES; i++) {
 274                 dev->frame[i].state = F_UNUSED;
 275                 dev->frame[i].buf.bytesused = 0;
 276         }
 277 }
 278
 279 /*
 280  * em2820_v4l2_open()
 281  * inits the device and starts isoc transfer
 282  */
 283 static int em2820_v4l2_open(struct inode *inode, struct file *filp)
 284 {
 285         int minor = iminor(inode);
 286         int errCode = 0;
 287         struct em2820 *h,*dev = NULL;
 288         struct list_head *list;
 289
 290         list_for_each(list,&em2820_devlist) {
 291                 h = list_entry(list, struct em2820, devlist);
 292                 if (h->vdev->minor == minor) {
 293                         dev  = h;
 294                 }
 295         }
 296
 297         filp->private_data=dev;
 298
 299
 300         em2820_videodbg("users=%d", dev->users);
 301
 302         if (!down_read_trylock(&em2820_disconnect))
 303                 return -ERESTARTSYS;
 304
 305         if (dev->users) {
 306                 em2820_warn("this driver can be opened only once\n");
 307                 up_read(&em2820_disconnect);
 308                 return -EBUSY;
 309         }
 310
 311 /*      if(dev->vbi_dev->minor == minor){
 312                 dev->type=V4L2_BUF_TYPE_VBI_CAPTURE;
 313         }*/
 314         if (dev->vdev->minor == minor) {
 315                 dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 316         }
 317
 318         init_MUTEX(&dev->fileop_lock);  /* to 1 == available */
 319         spin_lock_init(&dev->queue_lock);
 320         init_waitqueue_head(&dev->wait_frame);
 321         init_waitqueue_head(&dev->wait_stream);
 322
 323         down(&dev->lock);
 324
 325         em2820_set_alternate(dev);
 326
 327         dev->width = norm_maxw(dev);
 328         dev->height = norm_maxh(dev);
 329         dev->frame_size = dev->width * dev->height * 2;
 330         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 331         dev->bytesperline = dev->width * 2;
 332         dev->hscale = 0;
 333         dev->vscale = 0;
 334
 335         em2820_capture_start(dev, 1);
 336         em2820_resolution_set(dev);
 337
 338         /* start the transfer */
 339         errCode = em2820_init_isoc(dev);
 340         if (errCode)
 341                 goto err;
 342
 343         dev->users++;
 344         filp->private_data = dev;
 345         dev->io = IO_NONE;
 346         dev->stream = STREAM_OFF;
 347         dev->num_frames = 0;
 348
 349         /* prepare queues */
 350         em2820_empty_framequeues(dev);
 351
 352         dev->state |= DEV_INITIALIZED;
 353
 354       err:
 355         up(&dev->lock);
 356         up_read(&em2820_disconnect);
 357         return errCode;
 358 }
 359
 360 /*
 361  * em2820_realease_resources()
 362  * unregisters the v4l2,i2c and usb devices
 363  * called when the device gets disconected or at module unload
 364 */
 365 static void em2820_release_resources(struct em2820 *dev)
 366 {
 367         down(&em2820_sysfs_lock);
 368
 369         em2820_info("V4L2 device /dev/video%d deregistered\n",
 370                     dev->vdev->minor);
 371         list_del(&dev->devlist);
 372         video_unregister_device(dev->vdev);
 373 /*      video_unregister_device(dev->vbi_dev); */
 374         em2820_i2c_unregister(dev);
 375         usb_put_dev(dev->udev);
 376         up(&em2820_sysfs_lock);
 377 }
 378
 379 /*
 380  * em2820_v4l2_close()
 381  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 382  */
 383 static int em2820_v4l2_close(struct inode *inode, struct file *filp)
 384 {
 385         int errCode;
 386         struct em2820 *dev=filp->private_data;
 387
 388         em2820_videodbg("users=%d", dev->users);
 389
 390         down(&dev->lock);
 391
 392         em2820_uninit_isoc(dev);
 393
 394         em2820_release_buffers(dev);
 395
 396         /* the device is already disconnect, free the remaining resources */
 397         if (dev->state & DEV_DISCONNECTED) {
 398                 em2820_release_resources(dev);
 399                 up(&dev->lock);
 400                 kfree(dev);
 401                 return 0;
 402         }
 403
 404         /* set alternate 0 */
 405         dev->alt = 0;
 406         em2820_videodbg("setting alternate 0");
 407         errCode = usb_set_interface(dev->udev, 0, 0);
 408         if (errCode < 0) {
 409                 em2820_errdev ("cannot change alternate number to 0 (error=%i)\n",
 410                      errCode);
 411         }
 412
 413         dev->users--;
 414         wake_up_interruptible_nr(&dev->open, 1);
 415         up(&dev->lock);
 416         return 0;
 417 }
 418
 419 /*
 420  * em2820_v4l2_read()
 421  * will allocate buffers when called for the first time
 422  */
 423 static ssize_t
 424 em2820_v4l2_read(struct file *filp, char __user * buf, size_t count,
 425                  loff_t * f_pos)
 426 {
 427         struct em2820_frame_t *f, *i;
 428         unsigned long lock_flags;
 429         int ret = 0;
 430         struct em2820 *dev = filp->private_data;
 431
 432         if (down_interruptible(&dev->fileop_lock))
 433                 return -ERESTARTSYS;
 434
 435         if (dev->state & DEV_DISCONNECTED) {
 436                 em2820_videodbg("device not present");
 437                 up(&dev->fileop_lock);
 438                 return -ENODEV;
 439         }
 440
 441         if (dev->state & DEV_MISCONFIGURED) {
 442                 em2820_videodbg("device misconfigured; close and open it again");
 443                 up(&dev->fileop_lock);
 444                 return -EIO;
 445         }
 446
 447         if (dev->io == IO_MMAP) {
 448                 em2820_videodbg ("IO method is set to mmap; close and open"
 449                                 " the device again to choose the read method");
 450                 up(&dev->fileop_lock);
 451                 return -EINVAL;
 452         }
 453
 454         if (dev->io == IO_NONE) {
 455                 if (!em2820_request_buffers(dev, EM2820_NUM_READ_FRAMES)) {
 456                         em2820_errdev("read failed, not enough memory\n");
 457                         up(&dev->fileop_lock);
 458                         return -ENOMEM;
 459                 }
 460                 dev->io = IO_READ;
 461                 dev->stream = STREAM_ON;
 462                 em2820_queue_unusedframes(dev);
 463         }
 464
 465         if (!count) {
 466                 up(&dev->fileop_lock);
 467                 return 0;
 468         }
 469
 470         if (list_empty(&dev->outqueue)) {
 471                 if (filp->f_flags & O_NONBLOCK) {
 472                         up(&dev->fileop_lock);
 473                         return -EAGAIN;
 474                 }
 475                 ret = wait_event_interruptible
 476                     (dev->wait_frame,
 477                      (!list_empty(&dev->outqueue)) ||
 478                      (dev->state & DEV_DISCONNECTED));
 479                 if (ret) {
 480                         up(&dev->fileop_lock);
 481                         return ret;
 482                 }
 483                 if (dev->state & DEV_DISCONNECTED) {
 484                         up(&dev->fileop_lock);
 485                         return -ENODEV;
 486                 }
 487         }
 488
 489         f = list_entry(dev->outqueue.prev, struct em2820_frame_t, frame);
 490
 491         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 492         list_for_each_entry(i, &dev->outqueue, frame)
 493             i->state = F_UNUSED;
 494         INIT_LIST_HEAD(&dev->outqueue);
 495         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 496
 497         em2820_queue_unusedframes(dev);
 498
 499         if (count > f->buf.length)
 500                 count = f->buf.length;
 501
 502         if (copy_to_user(buf, f->bufmem, count)) {
 503                 up(&dev->fileop_lock);
 504                 return -EFAULT;
 505         }
 506         *f_pos += count;
 507
 508         up(&dev->fileop_lock);
 509
 510         return count;
 511 }
 512
 513 /*
 514  * em2820_v4l2_poll()
 515  * will allocate buffers when called for the first time
 516  */
 517 static unsigned int em2820_v4l2_poll(struct file *filp, poll_table * wait)
 518 {
 519         unsigned int mask = 0;
 520         struct em2820 *dev = filp->private_data;
 521
 522         if (down_interruptible(&dev->fileop_lock))
 523                 return POLLERR;
 524
 525         if (dev->state & DEV_DISCONNECTED) {
 526                 em2820_videodbg("device not present");
 527         } else if (dev->state & DEV_MISCONFIGURED) {
 528                 em2820_videodbg("device is misconfigured; close and open it again");
 529         } else {
 530                 if (dev->io == IO_NONE) {
 531                         if (!em2820_request_buffers
 532                             (dev, EM2820_NUM_READ_FRAMES)) {
 533                                 em2820_warn
 534                                     ("poll() failed, not enough memory\n");
 535                         } else {
 536                                 dev->io = IO_READ;
 537                                 dev->stream = STREAM_ON;
 538                         }
 539                 }
 540
 541                 if (dev->io == IO_READ) {
 542                         em2820_queue_unusedframes(dev);
 543                         poll_wait(filp, &dev->wait_frame, wait);
 544
 545                         if (!list_empty(&dev->outqueue))
 546                                 mask |= POLLIN | POLLRDNORM;
 547
 548                         up(&dev->fileop_lock);
 549
 550                         return mask;
 551                 }
 552         }
 553
 554         up(&dev->fileop_lock);
 555         return POLLERR;
 556 }
 557
 558 /*
 559  * em2820_vm_open()
 560  */
 561 static void em2820_vm_open(struct vm_area_struct *vma)
 562 {
 563         struct em2820_frame_t *f = vma->vm_private_data;
 564         f->vma_use_count++;
 565 }
 566
 567 /*
 568  * em2820_vm_close()
 569  */
 570 static void em2820_vm_close(struct vm_area_struct *vma)
 571 {
 572         /* NOTE: buffers are not freed here */
 573         struct em2820_frame_t *f = vma->vm_private_data;
 574         f->vma_use_count--;
 575 }
 576
 577 static struct vm_operations_struct em2820_vm_ops = {
 578         .open = em2820_vm_open,
 579         .close = em2820_vm_close,
 580 };
 581
 582 /*
 583  * em2820_v4l2_mmap()
 584  */
 585 static int em2820_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 586 {
 587         unsigned long size = vma->vm_end - vma->vm_start,
 588             start = vma->vm_start, pos, page;
 589         u32 i;
 590
 591         struct em2820 *dev = filp->private_data;
 592
 593         if (down_interruptible(&dev->fileop_lock))
 594                 return -ERESTARTSYS;
 595
 596         if (dev->state & DEV_DISCONNECTED) {
 597                 em2820_videodbg("mmap: device not present");
 598                 up(&dev->fileop_lock);
 599                 return -ENODEV;
 600         }
 601
 602         if (dev->state & DEV_MISCONFIGURED) {
 603                 em2820_videodbg ("mmap: Device is misconfigured; close and "
 604                                                 "open it again");
 605                 up(&dev->fileop_lock);
 606                 return -EIO;
 607         }
 608
 609         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
 610             size != PAGE_ALIGN(dev->frame[0].buf.length)) {
 611                 up(&dev->fileop_lock);
 612                 return -EINVAL;
 613         }
 614
 615         for (i = 0; i < dev->num_frames; i++) {
 616                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
 617                         break;
 618         }
 619         if (i == dev->num_frames) {
 620                 em2820_videodbg("mmap: user supplied mapping address is out of range");
 621                 up(&dev->fileop_lock);
 622                 return -EINVAL;
 623         }
 624
 625         /* VM_IO is eventually going to replace PageReserved altogether */
 626         vma->vm_flags |= VM_IO;
 627         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
 628
 629         pos = (unsigned long)dev->frame[i].bufmem;
 630         while (size > 0) {      /* size is page-aligned */
 631                 page = vmalloc_to_pfn((void *)pos);
 632                 if (remap_pfn_range(vma, start, page, PAGE_SIZE,
 633                                     vma->vm_page_prot)) {
 634                         em2820_videodbg("mmap: rename page map failed");
 635                         up(&dev->fileop_lock);
 636                         return -EAGAIN;
 637                 }
 638                 start += PAGE_SIZE;
 639                 pos += PAGE_SIZE;
 640                 size -= PAGE_SIZE;
 641         }
 642
 643         vma->vm_ops = &em2820_vm_ops;
 644         vma->vm_private_data = &dev->frame[i];
 645
 646         em2820_vm_open(vma);
 647         up(&dev->fileop_lock);
 648         return 0;
 649 }
 650
 651 /*
 652  * em2820_get_ctrl()
 653  * return the current saturation, brightness or contrast, mute state
 654  */
 655 static int em2820_get_ctrl(struct em2820 *dev, struct v4l2_control *ctrl)
 656 {
 657         s32 tmp;
 658         switch (ctrl->id) {
 659         case V4L2_CID_AUDIO_MUTE:
 660                 ctrl->value = dev->mute;
 661                 return 0;
 662         case V4L2_CID_AUDIO_VOLUME:
 663                 ctrl->value = dev->volume;
 664                 return 0;
 665         case V4L2_CID_BRIGHTNESS:
 666                 if ((tmp = em2820_brightness_get(dev)) < 0)
 667                         return -EIO;
 668                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 669                 return 0;
 670         case V4L2_CID_CONTRAST:
 671                 if ((ctrl->value = em2820_contrast_get(dev)) < 0)
 672                         return -EIO;
 673                 return 0;
 674         case V4L2_CID_SATURATION:
 675                 if ((ctrl->value = em2820_saturation_get(dev)) < 0)
 676                         return -EIO;
 677                 return 0;
 678         case V4L2_CID_RED_BALANCE:
 679                 if ((tmp = em2820_v_balance_get(dev)) < 0)
 680                         return -EIO;
 681                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 682                 return 0;
 683         case V4L2_CID_BLUE_BALANCE:
 684                 if ((tmp = em2820_u_balance_get(dev)) < 0)
 685                         return -EIO;
 686                 ctrl->value = (s32) ((s8) tmp); /* FIXME: clenaer way to extend sign? */
 687                 return 0;
 688         case V4L2_CID_GAMMA:
 689                 if ((ctrl->value = em2820_gamma_get(dev)) < 0)
 690                         return -EIO;
 691                 return 0;
 692         default:
 693                 return -EINVAL;
 694         }
 695 }
 696
 697 /*
 698  * em2820_set_ctrl()
 699  * mute or set new saturation, brightness or contrast
 700  */
 701 static int em2820_set_ctrl(struct em2820 *dev, const struct v4l2_control *ctrl)
 702 {
 703         switch (ctrl->id) {
 704         case V4L2_CID_AUDIO_MUTE:
 705                 if (ctrl->value != dev->mute) {
 706                         dev->mute = ctrl->value;
 707                         em2820_audio_usb_mute(dev, ctrl->value);
 708                         return em2820_audio_analog_set(dev);
 709                 }
 710                 return 0;
 711         case V4L2_CID_AUDIO_VOLUME:
 712                 dev->volume = ctrl->value;
 713                 return em2820_audio_analog_set(dev);
 714         case V4L2_CID_BRIGHTNESS:
 715                 return em2820_brightness_set(dev, ctrl->value);
 716         case V4L2_CID_CONTRAST:
 717                 return em2820_contrast_set(dev, ctrl->value);
 718         case V4L2_CID_SATURATION:
 719                 return em2820_saturation_set(dev, ctrl->value);
 720         case V4L2_CID_RED_BALANCE:
 721                 return em2820_v_balance_set(dev, ctrl->value);
 722         case V4L2_CID_BLUE_BALANCE:
 723                 return em2820_u_balance_set(dev, ctrl->value);
 724         case V4L2_CID_GAMMA:
 725                 return em2820_gamma_set(dev, ctrl->value);
 726         default:
 727                 return -EINVAL;
 728         }
 729 }
 730
 731 /*
 732  * em2820_stream_interrupt()
 733  * stops streaming
 734  */
 735 static int em2820_stream_interrupt(struct em2820 *dev)
 736 {
 737         int ret = 0;
 738
 739         /* stop reading from the device */
 740
 741         dev->stream = STREAM_INTERRUPT;
 742         ret = wait_event_timeout(dev->wait_stream,
 743                                  (dev->stream == STREAM_OFF) ||
 744                                  (dev->state & DEV_DISCONNECTED),
 745                                  EM2820_URB_TIMEOUT);
 746         if (dev->state & DEV_DISCONNECTED)
 747                 return -ENODEV;
 748         else if (ret) {
 749                 dev->state |= DEV_MISCONFIGURED;
 750                 em2820_videodbg("device is misconfigured; close and "
 751                         "open /dev/video%d again", dev->vdev->minor);
 752                 return ret;
 753         }
 754
 755         return 0;
 756 }
 757
 758 static int em2820_set_norm(struct em2820 *dev, int width, int height)
 759 {
 760         unsigned int hscale, vscale;
 761         unsigned int maxh, maxw;
 762
 763         maxw = norm_maxw(dev);
 764         maxh = norm_maxh(dev);
 765
 766         /* width must even because of the YUYV format */
 767         /* height must be even because of interlacing */
 768         height &= 0xfffe;
 769         width &= 0xfffe;
 770
 771         if (height < 32)
 772                 height = 32;
 773         if (height > maxh)
 774                 height = maxh;
 775         if (width < 48)
 776                 width = 48;
 777         if (width > maxw)
 778                 width = maxw;
 779
 780         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 781                 hscale = 0x3fff;
 782         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 783
 784         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 785                 vscale = 0x3fff;
 786         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 787
 788         /* set new image size */
 789         dev->width = width;
 790         dev->height = height;
 791         dev->frame_size = dev->width * dev->height * 2;
 792         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 793         dev->bytesperline = dev->width * 2;
 794         dev->hscale = hscale;
 795         dev->vscale = vscale;
 796
 797         em2820_resolution_set(dev);
 798
 799         return 0;
 800 }
 801
 802 static void video_mux(struct em2820 *dev, int index)
 803 {
 804         int input, ainput;
 805
 806         input = INPUT(index)->vmux;
 807         dev->ctl_input = index;
 808
 809         em2820_i2c_call_clients(dev, DECODER_SET_INPUT, &input);
 810
 811         dev->ctl_ainput = INPUT(index)->amux;
 812
 813         switch (dev->ctl_ainput) {
 814         case 0:
 815                 ainput = EM2820_AUDIO_SRC_TUNER;
 816                 break;
 817         default:
 818                 ainput = EM2820_AUDIO_SRC_LINE;
 819         }
 820
 821         em2820_audio_source(dev, ainput);
 822 }
 823
 824 /*
 825  * em2820_v4l2_do_ioctl()
 826  * This function is _not_ called directly, but from
 827  * em2820_v4l2_ioctl. Userspace
 828  * copying is done already, arg is a kernel pointer.
 829  */
 830 static int em2820_do_ioctl(struct inode *inode, struct file *filp,
 831                            struct em2820 *dev, unsigned int cmd, void *arg,
 832                            v4l2_kioctl driver_ioctl)
 833 {
 834         int ret;
 835
 836         switch (cmd) {
 837                 /* ---------- tv norms ---------- */
 838         case VIDIOC_ENUMSTD:
 839                 {
 840                         struct v4l2_standard *e = arg;
 841                         unsigned int i;
 842
 843                         i = e->index;
 844                         if (i >= TVNORMS)
 845                                 return -EINVAL;
 846                         ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 847                                                        tvnorms[e->index].name);
 848                         e->index = i;
 849                         if (ret < 0)
 850                                 return ret;
 851                         return 0;
 852                 }
 853         case VIDIOC_G_STD:
 854                 {
 855                         v4l2_std_id *id = arg;
 856
 857                         *id = dev->tvnorm->id;
 858                         return 0;
 859                 }
 860         case VIDIOC_S_STD:
 861                 {
 862                         v4l2_std_id *id = arg;
 863                         unsigned int i;
 864
 865                         for (i = 0; i < TVNORMS; i++)
 866                                 if (*id == tvnorms[i].id)
 867                                         break;
 868                         if (i == TVNORMS)
 869                                 for (i = 0; i < TVNORMS; i++)
 870                                         if (*id & tvnorms[i].id)
 871                                                 break;
 872                         if (i == TVNORMS)
 873                                 return -EINVAL;
 874
 875                         down(&dev->lock);
 876                         dev->tvnorm = &tvnorms[i];
 877
 878                         em2820_set_norm(dev, dev->width, dev->height);
 879
 880 /*
 881                 dev->width=norm_maxw(dev);
 882                 dev->height=norm_maxh(dev);
 883                 dev->frame_size=dev->width*dev->height*2;
 884                 dev->field_size=dev->frame_size>>1;
 885                 dev->bytesperline=dev->width*2;
 886                 dev->hscale=0;
 887                 dev->vscale=0;
 888
 889                 em2820_resolution_set(dev);
 890 */
 891 /*
 892                 em2820_uninit_isoc(dev);
 893                 em2820_set_alternate(dev);
 894                 em2820_capture_start(dev, 1);
 895                 em2820_resolution_set(dev);
 896                 em2820_init_isoc(dev);
 897 */
 898                         em2820_i2c_call_clients(dev, DECODER_SET_NORM,
 899                                                 &tvnorms[i].mode);
 900                         em2820_i2c_call_clients(dev, VIDIOC_S_STD,
 901                                                 &dev->tvnorm->id);
 902
 903                         up(&dev->lock);
 904
 905                         return 0;
 906                 }
 907
 908                 /* ------ input switching ---------- */
 909         case VIDIOC_ENUMINPUT:
 910                 {
 911                         struct v4l2_input *i = arg;
 912                         unsigned int n;
 913                         static const char *iname[] = {
 914                                 [EM2820_VMUX_COMPOSITE1] = "Composite1",
 915                                 [EM2820_VMUX_COMPOSITE2] = "Composite2",
 916                                 [EM2820_VMUX_COMPOSITE3] = "Composite3",
 917                                 [EM2820_VMUX_COMPOSITE4] = "Composite4",
 918                                 [EM2820_VMUX_SVIDEO] = "S-Video",
 919                                 [EM2820_VMUX_TELEVISION] = "Television",
 920                                 [EM2820_VMUX_CABLE] = "Cable TV",
 921                                 [EM2820_VMUX_DVB] = "DVB",
 922                                 [EM2820_VMUX_DEBUG] = "for debug only",
 923                         };
 924
 925                         n = i->index;
 926                         if (n >= MAX_EM2820_INPUT)
 927                                 return -EINVAL;
 928                         if (0 == INPUT(n)->type)
 929                                 return -EINVAL;
 930                         memset(i, 0, sizeof(*i));
 931                         i->index = n;
 932                         i->type = V4L2_INPUT_TYPE_CAMERA;
 933                         strcpy(i->name, iname[INPUT(n)->type]);
 934                         if ((EM2820_VMUX_TELEVISION == INPUT(n)->type) ||
 935                             (EM2820_VMUX_CABLE == INPUT(n)->type))
 936                                 i->type = V4L2_INPUT_TYPE_TUNER;
 937                         for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
 938                                 i->std |= tvnorms[n].id;
 939                         return 0;
 940                 }
 941
 942         case VIDIOC_G_INPUT:
 943                 {
 944                         int *i = arg;
 945                         *i = dev->ctl_input;
 946
 947                         return 0;
 948                 }
 949
 950         case VIDIOC_S_INPUT:
 951                 {
 952                         int *index = arg;
 953
 954                         if (*index >= MAX_EM2820_INPUT)
 955                                 return -EINVAL;
 956                         if (0 == INPUT(*index)->type)
 957                                 return -EINVAL;
 958
 959                         down(&dev->lock);
 960                         video_mux(dev, *index);
 961                         up(&dev->lock);
 962
 963                         return 0;
 964                 }
 965
 966         case VIDIOC_G_AUDIO:
 967                 {
 968                         struct v4l2_audio *a = arg;
 969                         unsigned int index = a->index;
 970
 971                         if (a->index > 1)
 972                                 return -EINVAL;
 973                         memset(a, 0, sizeof(*a));
 974                         index = dev->ctl_ainput;
 975
 976                         if (index == 0) {
 977                                 strcpy(a->name, "Television");
 978                         } else {
 979                                 strcpy(a->name, "Line In");
 980                         }
 981                         a->capability = V4L2_AUDCAP_STEREO;
 982                         a->index = index;
 983                         return 0;
 984                 }
 985
 986         case VIDIOC_S_AUDIO:
 987                 {
 988                         struct v4l2_audio *a = arg;
 989                         if (a->index != dev->ctl_ainput)
 990                                 return -EINVAL;
 991
 992                         return 0;
 993                 }
 994
 995                 /* --- controls ---------------------------------------------- */
 996         case VIDIOC_QUERYCTRL:
 997                 {
 998                         struct v4l2_queryctrl *qc = arg;
 999                         u8 i, n;
1000                         n = sizeof(em2820_qctrl) / sizeof(em2820_qctrl[0]);
1001                         for (i = 0; i < n; i++)
1002                                 if (qc->id && qc->id == em2820_qctrl[i].id) {
1003                                         memcpy(qc, &(em2820_qctrl[i]),
1004                                                sizeof(*qc));
1005                                         return 0;
1006                                 }
1007
1008                         return -EINVAL;
1009                 }
1010
1011         case VIDIOC_G_CTRL:
1012                 {
1013                         struct v4l2_control *ctrl = arg;
1014
1015
1016                         return em2820_get_ctrl(dev, ctrl);
1017                 }
1018
1019         case VIDIOC_S_CTRL_OLD: /* ??? */
1020         case VIDIOC_S_CTRL:
1021                 {
1022                         struct v4l2_control *ctrl = arg;
1023                         u8 i, n;
1024
1025
1026                         n = sizeof(em2820_qctrl) / sizeof(em2820_qctrl[0]);
1027                         for (i = 0; i < n; i++)
1028                                 if (ctrl->id == em2820_qctrl[i].id) {
1029                                         if (ctrl->value <
1030                                             em2820_qctrl[i].minimum
1031                                             || ctrl->value >
1032                                             em2820_qctrl[i].maximum)
1033                                                 return -ERANGE;
1034
1035                                         return em2820_set_ctrl(dev, ctrl);
1036                                 }
1037                         return -EINVAL;
1038                 }
1039
1040                 /* --- tuner ioctls ------------------------------------------ */
1041         case VIDIOC_G_TUNER:
1042                 {
1043                         struct v4l2_tuner *t = arg;
1044                         int status = 0;
1045
1046                         if (0 != t->index)
1047                                 return -EINVAL;
1048
1049                         memset(t, 0, sizeof(*t));
1050                         strcpy(t->name, "Tuner");
1051                         t->type = V4L2_TUNER_ANALOG_TV;
1052                         t->capability = V4L2_TUNER_CAP_NORM;
1053                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1054 /*              t->signal = 0xffff;*/
1055 /*              em2820_i2c_call_clients(dev,VIDIOC_G_TUNER,t);*/
1056                         /* No way to get signal strength? */
1057                         down(&dev->lock);
1058                         em2820_i2c_call_clients(dev, DECODER_GET_STATUS,
1059                                                 &status);
1060                         up(&dev->lock);
1061                         t->signal =
1062                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1063
1064                         em2820_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x", t->signal,
1065                                  t->afc);
1066                         return 0;
1067                 }
1068         case VIDIOC_S_TUNER:
1069                 {
1070                         struct v4l2_tuner *t = arg;
1071                         int status = 0;
1072
1073                         if (0 != t->index)
1074                                 return -EINVAL;
1075                         memset(t, 0, sizeof(*t));
1076                         strcpy(t->name, "Tuner");
1077                         t->type = V4L2_TUNER_ANALOG_TV;
1078                         t->capability = V4L2_TUNER_CAP_NORM;
1079                         t->rangehigh = 0xffffffffUL;    /* FIXME: set correct range */
1080 /*              t->signal = 0xffff; */
1081                         /* No way to get signal strength? */
1082                         down(&dev->lock);
1083                         em2820_i2c_call_clients(dev, DECODER_GET_STATUS,
1084                                                 &status);
1085                         up(&dev->lock);
1086                         t->signal =
1087                             (status & DECODER_STATUS_GOOD) != 0 ? 0xffff : 0;
1088
1089                         em2820_videodbg("VIDIO_S_TUNER: signal=%x, afc=%x\n",
1090                                  t->signal, t->afc);
1091                         return 0;
1092                 }
1093         case VIDIOC_G_FREQUENCY:
1094                 {
1095                         struct v4l2_frequency *f = arg;
1096
1097                         memset(f, 0, sizeof(*f));
1098                         f->type = V4L2_TUNER_ANALOG_TV;
1099                         f->frequency = dev->ctl_freq;
1100
1101                         return 0;
1102                 }
1103         case VIDIOC_S_FREQUENCY:
1104                 {
1105                         struct v4l2_frequency *f = arg;
1106
1107                         if (0 != f->tuner)
1108                                 return -EINVAL;
1109
1110                         if (V4L2_TUNER_ANALOG_TV != f->type)
1111                                 return -EINVAL;
1112
1113                         down(&dev->lock);
1114                         dev->ctl_freq = f->frequency;
1115                         em2820_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1116                         up(&dev->lock);
1117                         return 0;
1118                 }
1119
1120         case VIDIOC_CROPCAP:
1121                 {
1122                         struct v4l2_cropcap *cc = arg;
1123
1124                         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1125                                 return -EINVAL;
1126                         cc->bounds.left = 0;
1127                         cc->bounds.top = 0;
1128                         cc->bounds.width = dev->width;
1129                         cc->bounds.height = dev->height;
1130                         cc->defrect = cc->bounds;
1131                         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1132                         cc->pixelaspect.denominator = 59;
1133                         return 0;
1134                 }
1135         case VIDIOC_STREAMON:
1136                 {
1137                         int *type = arg;
1138
1139                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1140                             || dev->io != IO_MMAP)
1141                                 return -EINVAL;
1142
1143                         if (list_empty(&dev->inqueue))
1144                                 return -EINVAL;
1145
1146                         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1147
1148                         em2820_videodbg("VIDIOC_STREAMON: starting stream");
1149
1150                         return 0;
1151                 }
1152         case VIDIOC_STREAMOFF:
1153                 {
1154                         int *type = arg;
1155                         int ret;
1156
1157                         if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1158                             || dev->io != IO_MMAP)
1159                                 return -EINVAL;
1160
1161                         if (dev->stream == STREAM_ON) {
1162                                 em2820_videodbg ("VIDIOC_STREAMOFF: interrupting stream");
1163                                 if ((ret = em2820_stream_interrupt(dev)))
1164                                         return ret;
1165                         }
1166                         em2820_empty_framequeues(dev);
1167
1168                         return 0;
1169                 }
1170         default:
1171                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1172                                                   driver_ioctl);
1173         }
1174         return 0;
1175 }
1176
1177 /*
1178  * em2820_v4l2_do_ioctl()
1179  * This function is _not_ called directly, but from
1180  * em2820_v4l2_ioctl. Userspace
1181  * copying is done already, arg is a kernel pointer.
1182  */
1183 static int em2820_video_do_ioctl(struct inode *inode, struct file *filp,
1184                                  unsigned int cmd, void *arg)
1185 {
1186         struct em2820 *dev = filp->private_data;
1187
1188         if (!dev)
1189                 return -ENODEV;
1190
1191         if (video_debug > 1)
1192                 em2820_print_ioctl(dev->name,cmd);
1193
1194         switch (cmd) {
1195
1196                 /* --- capabilities ------------------------------------------ */
1197         case VIDIOC_QUERYCAP:
1198                 {
1199                         struct v4l2_capability *cap = arg;
1200
1201                         memset(cap, 0, sizeof(*cap));
1202                         strlcpy(cap->driver, "em2820", sizeof(cap->driver));
1203                         strlcpy(cap->card, em2820_boards[dev->model].name,
1204                                 sizeof(cap->card));
1205                         strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1206                                 sizeof(cap->bus_info));
1207                         cap->version = EM2820_VERSION_CODE;
1208                         cap->capabilities =
1209                             V4L2_CAP_VIDEO_CAPTURE |
1210                             V4L2_CAP_AUDIO |
1211                             V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1212                         if (dev->has_tuner)
1213                                 cap->capabilities |= V4L2_CAP_TUNER;
1214                         return 0;
1215                 }
1216
1217                 /* --- capture ioctls ---------------------------------------- */
1218         case VIDIOC_ENUM_FMT:
1219                 {
1220                         struct v4l2_fmtdesc *fmtd = arg;
1221
1222                         if (fmtd->index != 0)
1223                                 return -EINVAL;
1224                         memset(fmtd, 0, sizeof(*fmtd));
1225                         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1226                         strcpy(fmtd->description, "Packed YUY2");
1227                         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1228                         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1229                         return 0;
1230                 }
1231
1232         case VIDIOC_G_FMT:
1233                 {
1234                         struct v4l2_format *format = arg;
1235
1236                         em2820_videodbg("VIDIOC_G_FMT: type=%s",
1237                                  format->type ==
1238                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1239                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1240                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1241                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1242                                  "not supported");
1243
1244                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1245                                 return -EINVAL;
1246
1247                         format->fmt.pix.width = dev->width;
1248                         format->fmt.pix.height = dev->height;
1249                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1250                         format->fmt.pix.bytesperline = dev->bytesperline;
1251                         format->fmt.pix.sizeimage = dev->frame_size;
1252                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1253                         format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
1254
1255                         em2820_videodbg("VIDIOC_G_FMT: %dx%d", dev->width,
1256                                  dev->height);
1257                         return 0;
1258                 }
1259
1260         case VIDIOC_TRY_FMT:
1261         case VIDIOC_S_FMT:
1262                 {
1263                         struct v4l2_format *format = arg;
1264                         u32 i;
1265                         int ret = 0;
1266                         int width = format->fmt.pix.width;
1267                         int height = format->fmt.pix.height;
1268                         unsigned int hscale, vscale;
1269                         unsigned int maxh, maxw;
1270
1271                         maxw = norm_maxw(dev);
1272                         maxh = norm_maxh(dev);
1273
1274 /*              int both_fields; */
1275
1276                         em2820_videodbg("%s: type=%s",
1277                                  cmd ==
1278                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1279                                  "VIDIOC_S_FMT",
1280                                  format->type ==
1281                                  V4L2_BUF_TYPE_VIDEO_CAPTURE ?
1282                                  "V4L2_BUF_TYPE_VIDEO_CAPTURE" : format->type ==
1283                                  V4L2_BUF_TYPE_VBI_CAPTURE ?
1284                                  "V4L2_BUF_TYPE_VBI_CAPTURE " :
1285                                  "not supported");
1286
1287                         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1288                                 return -EINVAL;
1289
1290                         em2820_videodbg("%s: requested %dx%d",
1291                                  cmd ==
1292                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1293                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1294                                  format->fmt.pix.height);
1295
1296                         /* FIXME: Move some code away from here */
1297                         /* width must even because of the YUYV format */
1298                         /* height must be even because of interlacing */
1299                         height &= 0xfffe;
1300                         width &= 0xfffe;
1301
1302                         if (height < 32)
1303                                 height = 32;
1304                         if (height > maxh)
1305                                 height = maxh;
1306                         if (width < 48)
1307                                 width = 48;
1308                         if (width > maxw)
1309                                 width = maxw;
1310
1311                         if(dev->is_em2800){
1312                                 /* the em2800 can only scale down to 50% */
1313                                 if(height % (maxh / 2))
1314                                         height=maxh;
1315                                 if(width % (maxw / 2))
1316                                         width=maxw;
1317                                 /* according to empiatech support */
1318                                 /* the MaxPacketSize is to small to support */
1319                                 /* framesizes larger than 640x480 @ 30 fps */
1320                                 /* or 640x576 @ 25 fps. As this would cut */
1321                                 /* of a part of the image we prefer */
1322                                 /* 360x576 or 360x480 for now */
1323                                 if(width == maxw && height == maxh)
1324                                         width /= 2;
1325                         }
1326
1327                         if ((hscale =
1328                              (((unsigned long)maxw) << 12) / width - 4096L) >=
1329                             0x4000)
1330                                 hscale = 0x3fff;
1331                         width =
1332                             (((unsigned long)maxw) << 12) / (hscale + 4096L);
1333
1334                         if ((vscale =
1335                              (((unsigned long)maxh) << 12) / height - 4096L) >=
1336                             0x4000)
1337                                 vscale = 0x3fff;
1338                         height =
1339                             (((unsigned long)maxh) << 12) / (vscale + 4096L);
1340
1341                         format->fmt.pix.width = width;
1342                         format->fmt.pix.height = height;
1343                         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1344                         format->fmt.pix.bytesperline = width * 2;
1345                         format->fmt.pix.sizeimage = width * 2 * height;
1346                         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
1347                         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
1348
1349                         em2820_videodbg("%s: returned %dx%d (%d, %d)",
1350                                  cmd ==
1351                                  VIDIOC_TRY_FMT ? "VIDIOC_TRY_FMT" :
1352                                  "VIDIOC_S_FMT", format->fmt.pix.width,
1353                                  format->fmt.pix.height, hscale, vscale);
1354
1355                         if (cmd == VIDIOC_TRY_FMT)
1356                                 return 0;
1357
1358                         for (i = 0; i < dev->num_frames; i++)
1359                                 if (dev->frame[i].vma_use_count) {
1360                                         em2820_videodbg("VIDIOC_S_FMT failed. "
1361                                                 "Unmap the buffers first.");
1362                                         return -EINVAL;
1363                                 }
1364
1365                         /* stop io in case it is already in progress */
1366                         if (dev->stream == STREAM_ON) {
1367                                 em2820_videodbg("VIDIOC_SET_FMT: interupting stream");
1368                                 if ((ret = em2820_stream_interrupt(dev)))
1369                                         return ret;
1370                         }
1371
1372                         em2820_release_buffers(dev);
1373                         dev->io = IO_NONE;
1374
1375                         /* set new image size */
1376                         dev->width = width;
1377                         dev->height = height;
1378                         dev->frame_size = dev->width * dev->height * 2;
1379                         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1380                         dev->bytesperline = dev->width * 2;
1381                         dev->hscale = hscale;
1382                         dev->vscale = vscale;
1383 /*                      dev->both_fileds = both_fileds; */
1384                         em2820_uninit_isoc(dev);
1385                         em2820_set_alternate(dev);
1386                         em2820_capture_start(dev, 1);
1387                         em2820_resolution_set(dev);
1388                         em2820_init_isoc(dev);
1389
1390                         return 0;
1391                 }
1392
1393                 /* --- streaming capture ------------------------------------- */
1394         case VIDIOC_REQBUFS:
1395                 {
1396                         struct v4l2_requestbuffers *rb = arg;
1397                         u32 i;
1398                         int ret;
1399
1400                         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1401                             rb->memory != V4L2_MEMORY_MMAP)
1402                                 return -EINVAL;
1403
1404                         if (dev->io == IO_READ) {
1405                                 em2820_videodbg ("method is set to read;"
1406                                         " close and open the device again to"
1407                                         " choose the mmap I/O method");
1408                                 return -EINVAL;
1409                         }
1410
1411                         for (i = 0; i < dev->num_frames; i++)
1412                                 if (dev->frame[i].vma_use_count) {
1413                                         em2820_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped");
1414                                         return -EINVAL;
1415                                 }
1416
1417                         if (dev->stream == STREAM_ON) {
1418                                 em2820_videodbg("VIDIOC_REQBUFS: interrupting stream");
1419                                 if ((ret = em2820_stream_interrupt(dev)))
1420                                         return ret;
1421                         }
1422
1423                         em2820_empty_framequeues(dev);
1424
1425                         em2820_release_buffers(dev);
1426                         if (rb->count)
1427                                 rb->count =
1428                                     em2820_request_buffers(dev, rb->count);
1429
1430                         dev->frame_current = NULL;
1431
1432                         em2820_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i",
1433                                                      rb->count);
1434                         dev->io = rb->count ? IO_MMAP : IO_NONE;
1435                         return 0;
1436                 }
1437
1438         case VIDIOC_QUERYBUF:
1439                 {
1440                         struct v4l2_buffer *b = arg;
1441
1442                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1443                             b->index >= dev->num_frames || dev->io != IO_MMAP)
1444                                 return -EINVAL;
1445
1446                         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1447
1448                         if (dev->frame[b->index].vma_use_count) {
1449                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1450                         }
1451                         if (dev->frame[b->index].state == F_DONE)
1452                                 b->flags |= V4L2_BUF_FLAG_DONE;
1453                         else if (dev->frame[b->index].state != F_UNUSED)
1454                                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1455                         return 0;
1456                 }
1457         case VIDIOC_QBUF:
1458                 {
1459                         struct v4l2_buffer *b = arg;
1460                         unsigned long lock_flags;
1461
1462                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1463                             b->index >= dev->num_frames || dev->io != IO_MMAP) {
1464                                 return -EINVAL;
1465                         }
1466
1467                         if (dev->frame[b->index].state != F_UNUSED) {
1468                                 return -EAGAIN;
1469                         }
1470                         dev->frame[b->index].state = F_QUEUED;
1471
1472                         /* add frame to fifo */
1473                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1474                         list_add_tail(&dev->frame[b->index].frame,
1475                                       &dev->inqueue);
1476                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1477
1478                         return 0;
1479                 }
1480         case VIDIOC_DQBUF:
1481                 {
1482                         struct v4l2_buffer *b = arg;
1483                         struct em2820_frame_t *f;
1484                         unsigned long lock_flags;
1485                         int ret = 0;
1486
1487                         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1488                             || dev->io != IO_MMAP)
1489                                 return -EINVAL;
1490
1491                         if (list_empty(&dev->outqueue)) {
1492                                 if (dev->stream == STREAM_OFF)
1493                                         return -EINVAL;
1494                                 if (filp->f_flags & O_NONBLOCK)
1495                                         return -EAGAIN;
1496                                 ret = wait_event_interruptible
1497                                     (dev->wait_frame,
1498                                      (!list_empty(&dev->outqueue)) ||
1499                                      (dev->state & DEV_DISCONNECTED));
1500                                 if (ret)
1501                                         return ret;
1502                                 if (dev->state & DEV_DISCONNECTED)
1503                                         return -ENODEV;
1504                         }
1505
1506                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1507                         f = list_entry(dev->outqueue.next,
1508                                        struct em2820_frame_t, frame);
1509                         list_del(dev->outqueue.next);
1510                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1511
1512                         f->state = F_UNUSED;
1513                         memcpy(b, &f->buf, sizeof(*b));
1514
1515                         if (f->vma_use_count)
1516                                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1517
1518                         return 0;
1519                 }
1520         default:
1521                 return em2820_do_ioctl(inode, filp, dev, cmd, arg,
1522                                        em2820_video_do_ioctl);
1523         }
1524         return 0;
1525 }
1526
1527 /*
1528  * em2820_v4l2_ioctl()
1529  * handle v4l2 ioctl the main action happens in em2820_v4l2_do_ioctl()
1530  */
1531 static int em2820_v4l2_ioctl(struct inode *inode, struct file *filp,
1532                              unsigned int cmd, unsigned long arg)
1533 {
1534         int ret = 0;
1535         struct em2820 *dev = filp->private_data;
1536
1537         if (down_interruptible(&dev->fileop_lock))
1538                 return -ERESTARTSYS;
1539
1540         if (dev->state & DEV_DISCONNECTED) {
1541                 em2820_errdev("v4l2 ioctl: device not present\n");
1542                 up(&dev->fileop_lock);
1543                 return -ENODEV;
1544         }
1545
1546         if (dev->state & DEV_MISCONFIGURED) {
1547                 em2820_errdev
1548                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1549                 up(&dev->fileop_lock);
1550                 return -EIO;
1551         }
1552
1553         ret = video_usercopy(inode, filp, cmd, arg, em2820_video_do_ioctl);
1554
1555         up(&dev->fileop_lock);
1556
1557         return ret;
1558 }
1559
1560 static struct file_operations em2820_v4l_fops = {
1561         .owner = THIS_MODULE,
1562         .open = em2820_v4l2_open,
1563         .release = em2820_v4l2_close,
1564         .ioctl = em2820_v4l2_ioctl,
1565         .read = em2820_v4l2_read,
1566         .poll = em2820_v4l2_poll,
1567         .mmap = em2820_v4l2_mmap,
1568         .llseek = no_llseek,
1569 };
1570
1571 /******************************** usb interface *****************************************/
1572
1573 /*
1574  * em2820_init_dev()
1575  * allocates and inits the device structs, registers i2c bus and v4l device
1576  */
1577 static int em2820_init_dev(struct em2820 **devhandle, struct usb_device *udev,
1578                            int minor, int model)
1579 {
1580         struct em2820 *dev = *devhandle;
1581         int retval = -ENOMEM;
1582         int errCode, i;
1583         unsigned int maxh, maxw;
1584         struct usb_interface *uif;
1585
1586         dev->udev = udev;
1587         dev->model = model;
1588         init_MUTEX(&dev->lock);
1589         init_waitqueue_head(&dev->open);
1590
1591         dev->em2820_write_regs = em2820_write_regs;
1592         dev->em2820_read_reg = em2820_read_reg;
1593         dev->em2820_read_reg_req_len = em2820_read_reg_req_len;
1594         dev->em2820_write_regs_req = em2820_write_regs_req;
1595         dev->em2820_read_reg_req = em2820_read_reg_req;
1596         dev->is_em2800 = em2820_boards[model].is_em2800;
1597         dev->has_tuner = em2820_boards[model].has_tuner;
1598         dev->has_msp34xx = em2820_boards[model].has_msp34xx;
1599         dev->tda9887_conf = em2820_boards[model].tda9887_conf;
1600         dev->decoder = em2820_boards[model].decoder;
1601
1602         if (tuner >= 0)
1603                 dev->tuner_type = tuner;
1604         else
1605                 dev->tuner_type = em2820_boards[model].tuner_type;
1606
1607         dev->video_inputs = em2820_boards[model].vchannels;
1608
1609         for (i = 0; i < TVNORMS; i++)
1610                 if (em2820_boards[model].norm == tvnorms[i].mode)
1611                         break;
1612         if (i == TVNORMS)
1613                 i = 0;
1614
1615         dev->tvnorm = &tvnorms[i];      /* set default norm */
1616
1617         em2820_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1618
1619         maxw = norm_maxw(dev);
1620         maxh = norm_maxh(dev);
1621
1622         /* set default image size */
1623         dev->width = maxw;
1624         dev->height = maxh;
1625         dev->interlaced = EM2820_INTERLACED_DEFAULT;
1626         dev->field_size = dev->width * dev->height;
1627         dev->frame_size =
1628             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1629         dev->bytesperline = dev->width * 2;
1630         dev->hscale = 0;
1631         dev->vscale = 0;
1632         dev->ctl_input = 2;
1633
1634         /* setup video picture settings for saa7113h */
1635         memset(&dev->vpic, 0, sizeof(dev->vpic));
1636         dev->vpic.colour = 128 << 8;
1637         dev->vpic.hue = 128 << 8;
1638         dev->vpic.brightness = 128 << 8;
1639         dev->vpic.contrast = 192 << 8;
1640         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1641         dev->vpic.depth = 16;
1642         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1643
1644         /* compute alternate max packet sizes */
1645         uif = dev->udev->actconfig->interface[0];
1646         dev->alt_max_pkt_size[0] = 0;
1647         for (i = 1; i <= EM2820_MAX_ALT && i < uif->num_altsetting ; i++) {
1648                 u16 tmp =
1649                     le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1650                                 wMaxPacketSize);
1651                 dev->alt_max_pkt_size[i] =
1652                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1653         }
1654
1655 #ifdef CONFIG_MODULES
1656         /* request some modules */
1657         if (dev->decoder == EM2820_SAA7113 || dev->decoder == EM2820_SAA7114)
1658                 request_module("saa711x");
1659         if (dev->decoder == EM2820_TVP5150)
1660                 request_module("tvp5150");
1661         if (dev->has_tuner)
1662                 request_module("tuner");
1663         if (dev->tda9887_conf)
1664                 request_module("tda9887");
1665 #endif
1666         errCode = em2820_config(dev);
1667         if (errCode) {
1668                 em2820_errdev("error configuring device\n");
1669                 kfree(dev);
1670                 return -ENOMEM;
1671         }
1672
1673         down(&dev->lock);
1674         /* register i2c bus */
1675         em2820_i2c_register(dev);
1676
1677         /* Do board specific init and eeprom reading */
1678         em2820_card_setup(dev);
1679
1680         /* configure the device */
1681         em2820_config_i2c(dev);
1682
1683         up(&dev->lock);
1684
1685         errCode = em2820_config(dev);
1686
1687 #ifdef CONFIG_MODULES
1688         if (dev->has_msp34xx)
1689                 request_module("msp3400");
1690 #endif
1691         /* allocate and fill v4l2 device struct */
1692         dev->vdev = video_device_alloc();
1693         if (NULL == dev->vdev) {
1694                 em2820_errdev("cannot allocate video_device.\n");
1695                 kfree(dev);
1696                 return -ENOMEM;
1697         }
1698
1699         dev->vdev->type = VID_TYPE_CAPTURE;
1700         if (dev->has_tuner)
1701                 dev->vdev->type |= VID_TYPE_TUNER;
1702         dev->vdev->hardware = 0;
1703         dev->vdev->fops = &em2820_v4l_fops;
1704         dev->vdev->minor = -1;
1705         dev->vdev->dev = &dev->udev->dev;
1706         dev->vdev->release = video_device_release;
1707         snprintf(dev->vdev->name, sizeof(dev->vdev->name), "%s",
1708                  "em2820 video");
1709         list_add_tail(&dev->devlist,&em2820_devlist);
1710
1711         /* register v4l2 device */
1712         down(&dev->lock);
1713         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER, -1))) {
1714                 em2820_errdev("unable to register video device (error=%i).\n",
1715                               retval);
1716                 up(&dev->lock);
1717                 list_del(&dev->devlist);
1718                 video_device_release(dev->vdev);
1719                 kfree(dev);
1720                 return -ENODEV;
1721         }
1722         if (dev->has_msp34xx) {
1723                 /* Send a reset to other chips via gpio */
1724                 em2820_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1725                 udelay(2500);
1726                 em2820_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1727                 udelay(2500);
1728
1729         }
1730         video_mux(dev, 0);
1731
1732         up(&dev->lock);
1733
1734         em2820_info("V4L2 device registered as /dev/video%d\n",
1735                     dev->vdev->minor);
1736
1737         return 0;
1738 }
1739
1740 /*
1741  * em2820_usb_probe()
1742  * checks for supported devices
1743  */
1744 static int em2820_usb_probe(struct usb_interface *interface,
1745                             const struct usb_device_id *id)
1746 {
1747         const struct usb_endpoint_descriptor *endpoint;
1748         struct usb_device *udev;
1749         struct em2820 *dev = NULL;
1750         int retval = -ENODEV;
1751         int model,i,nr,ifnum;
1752
1753         udev = usb_get_dev(interface_to_usbdev(interface));
1754         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1755
1756
1757         /* Don't register audio interfaces */
1758         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1759                 em2820_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1760                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1761                                 ifnum,
1762                                 interface->altsetting[0].desc.bInterfaceClass);
1763                 return -ENODEV;
1764         }
1765
1766         em2820_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1767                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1768                         ifnum,
1769                         interface->altsetting[0].desc.bInterfaceClass);
1770
1771         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1772
1773         /* check if the the device has the iso in endpoint at the correct place */
1774         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1775             USB_ENDPOINT_XFER_ISOC) {
1776                 em2820_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1777                 return -ENODEV;
1778         }
1779         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1780                 em2820_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1781                 return -ENODEV;
1782         }
1783
1784         model=id->driver_info;
1785         nr=interface->minor;
1786
1787         if (nr>EM2820_MAXBOARDS) {
1788                 printk ("em2820: Supports only %i em28xx boards.\n",EM2820_MAXBOARDS);
1789                 return -ENOMEM;
1790         }
1791
1792         /* allocate memory for our device state and initialize it */
1793         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
1794         if (dev == NULL) {
1795                 em2820_err(DRIVER_NAME ": out of memory!\n");
1796                 return -ENOMEM;
1797         }
1798         memset(dev, 0, sizeof(*dev));
1799
1800         snprintf(dev->name, 29, "em2820 #%d", nr);
1801
1802         if ((card[nr]>=0)&&(card[nr]<em2820_bcount))
1803                 model=card[nr];
1804
1805         if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
1806                 printk( "%s: Your board has no eeprom inside it and thus can't\n"
1807                         "%s: be autodetected.  Please pass card=<n> insmod option to\n"
1808                         "%s: workaround that.  Redirect complaints to the vendor of\n"
1809                         "%s: the TV card.  Best regards,\n"
1810                         "%s:         -- tux\n",
1811                         dev->name,dev->name,dev->name,dev->name,dev->name);
1812                 printk("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
1813                         dev->name);
1814                 for (i = 0; i < em2820_bcount; i++) {
1815                         printk("%s:    card=%d -> %s\n",
1816                                 dev->name, i, em2820_boards[i].name);
1817                 }
1818         }
1819
1820         /* allocate device struct */
1821         retval = em2820_init_dev(&dev, udev, nr, model);
1822         if (retval)
1823                 return retval;
1824
1825         em2820_info("Found %s\n", em2820_boards[model].name);
1826
1827         /* save our data pointer in this interface device */
1828         usb_set_intfdata(interface, dev);
1829         return 0;
1830 }
1831
1832 /*
1833  * em2820_usb_disconnect()
1834  * called when the device gets diconencted
1835  * video device will be unregistered on v4l2_close in case it is still open
1836  */
1837 static void em2820_usb_disconnect(struct usb_interface *interface)
1838 {
1839         struct em2820 *dev = usb_get_intfdata(interface);
1840         usb_set_intfdata(interface, NULL);
1841
1842         if (!dev)
1843                 return;
1844
1845         down_write(&em2820_disconnect);
1846
1847         down(&dev->lock);
1848
1849         em2820_info("disconnecting %s\n", dev->vdev->name);
1850
1851         wake_up_interruptible_all(&dev->open);
1852
1853         if (dev->users) {
1854                 em2820_warn
1855                     ("device /dev/video%d is open! Deregistration and memory "
1856                      "deallocation are deferred on close.\n", dev->vdev->minor);
1857                 dev->state |= DEV_MISCONFIGURED;
1858                 em2820_uninit_isoc(dev);
1859                 dev->state |= DEV_DISCONNECTED;
1860                 wake_up_interruptible(&dev->wait_frame);
1861                 wake_up_interruptible(&dev->wait_stream);
1862         } else {
1863                 dev->state |= DEV_DISCONNECTED;
1864                 em2820_release_resources(dev);
1865         }
1866
1867         up(&dev->lock);
1868
1869         if (!dev->users)
1870                 kfree(dev);
1871
1872         up_write(&em2820_disconnect);
1873
1874 }
1875
1876 static struct usb_driver em2820_usb_driver = {
1877         .owner = THIS_MODULE,
1878         .name = "em2820",
1879         .probe = em2820_usb_probe,
1880         .disconnect = em2820_usb_disconnect,
1881         .id_table = em2820_id_table,
1882 };
1883
1884 static int __init em2820_module_init(void)
1885 {
1886         int result;
1887
1888         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1889                (EM2820_VERSION_CODE >> 16) & 0xff,
1890                (EM2820_VERSION_CODE >> 8) & 0xff, EM2820_VERSION_CODE & 0xff);
1891 #ifdef SNAPSHOT
1892         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1893                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1894 #endif
1895
1896         /* register this driver with the USB subsystem */
1897         result = usb_register(&em2820_usb_driver);
1898         if (result)
1899                 em2820_err(DRIVER_NAME
1900                            " usb_register failed. Error number %d.\n", result);
1901
1902         return result;
1903 }
1904
1905 static void __exit em2820_module_exit(void)
1906 {
1907         /* deregister this driver with the USB subsystem */
1908         usb_deregister(&em2820_usb_driver);
1909 }
1910
1911 module_init(em2820_module_init);
1912 module_exit(em2820_module_exit);