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

   1 /*
   2    em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9         Some parts based on SN9C10x PC Camera Controllers GPL driver made
  10                 by Luca Risolia <luca.risolia@studio.unibo.it>
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/bitmap.h>
  32 #include <linux/usb.h>
  33 #include <linux/i2c.h>
  34 #include <linux/version.h>
  35 #include <linux/mm.h>
  36 #include <linux/video_decoder.h>
  37 #include <linux/mutex.h>
  38
  39 #include "em28xx.h"
  40 #include <media/tuner.h>
  41 #include <media/v4l2-common.h>
  42 #include <media/msp3400.h>
  43
  44 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  45                       "Markus Rechberger <mrechberger@gmail.com>, " \
  46                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  47                       "Sascha Sommer <saschasommer@freenet.de>"
  48
  49 #define DRIVER_NAME         "em28xx"
  50 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  51 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
  52
  53 #define em28xx_videodbg(fmt, arg...) do {\
  54         if (video_debug) \
  55                 printk(KERN_INFO "%s %s :"fmt, \
  56                          dev->name, __FUNCTION__ , ##arg); } while (0)
  57
  58 MODULE_AUTHOR(DRIVER_AUTHOR);
  59 MODULE_DESCRIPTION(DRIVER_DESC);
  60 MODULE_LICENSE("GPL");
  61
  62 static LIST_HEAD(em28xx_devlist);
  63
  64 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  65 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  66 static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  67 module_param_array(card,  int, NULL, 0444);
  68 module_param_array(video_nr, int, NULL, 0444);
  69 module_param_array(vbi_nr, int, NULL, 0444);
  70 MODULE_PARM_DESC(card,"card type");
  71 MODULE_PARM_DESC(video_nr,"video device numbers");
  72 MODULE_PARM_DESC(vbi_nr,"vbi device numbers");
  73
  74 static int tuner = -1;
  75 module_param(tuner, int, 0444);
  76 MODULE_PARM_DESC(tuner, "tuner type");
  77
  78 static unsigned int video_debug = 0;
  79 module_param(video_debug,int,0644);
  80 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  81
  82 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  83 static unsigned long em28xx_devused;
  84
  85 /* supported tv norms */
  86 static struct em28xx_tvnorm tvnorms[] = {
  87         {
  88                 .name = "PAL",
  89                 .id = V4L2_STD_PAL,
  90                 .mode = VIDEO_MODE_PAL,
  91          }, {
  92                 .name = "NTSC",
  93                 .id = V4L2_STD_NTSC,
  94                 .mode = VIDEO_MODE_NTSC,
  95         }, {
  96                  .name = "SECAM",
  97                  .id = V4L2_STD_SECAM,
  98                  .mode = VIDEO_MODE_SECAM,
  99         }, {
 100                 .name = "PAL-M",
 101                 .id = V4L2_STD_PAL_M,
 102                 .mode = VIDEO_MODE_PAL,
 103         }
 104 };
 105
 106 #define TVNORMS ARRAY_SIZE(tvnorms)
 107
 108 /* supported controls */
 109 /* Common to all boards */
 110 static struct v4l2_queryctrl em28xx_qctrl[] = {
 111         {
 112                 .id = V4L2_CID_AUDIO_VOLUME,
 113                 .type = V4L2_CTRL_TYPE_INTEGER,
 114                 .name = "Volume",
 115                 .minimum = 0x0,
 116                 .maximum = 0x1f,
 117                 .step = 0x1,
 118                 .default_value = 0x1f,
 119                 .flags = 0,
 120         },{
 121                 .id = V4L2_CID_AUDIO_MUTE,
 122                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 123                 .name = "Mute",
 124                 .minimum = 0,
 125                 .maximum = 1,
 126                 .step = 1,
 127                 .default_value = 1,
 128                 .flags = 0,
 129         }
 130 };
 131
 132 static struct usb_driver em28xx_usb_driver;
 133
 134 static DEFINE_MUTEX(em28xx_sysfs_lock);
 135 static DECLARE_RWSEM(em28xx_disconnect);
 136
 137 /*********************  v4l2 interface  ******************************************/
 138
 139 /*
 140  * em28xx_config()
 141  * inits registers with sane defaults
 142  */
 143 static int em28xx_config(struct em28xx *dev)
 144 {
 145
 146         /* Sets I2C speed to 100 KHz */
 147         em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 148
 149         /* enable vbi capturing */
 150
 151 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 152 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 153         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 154
 155         em28xx_audio_usb_mute(dev, 1);
 156         dev->mute = 1;          /* maybe not the right place... */
 157         dev->volume = 0x1f;
 158         em28xx_audio_analog_set(dev);
 159         em28xx_audio_analog_setup(dev);
 160         em28xx_outfmt_set_yuv422(dev);
 161         em28xx_colorlevels_set_default(dev);
 162         em28xx_compression_disable(dev);
 163
 164         return 0;
 165 }
 166
 167 /*
 168  * em28xx_config_i2c()
 169  * configure i2c attached devices
 170  */
 171 static void em28xx_config_i2c(struct em28xx *dev)
 172 {
 173         struct v4l2_frequency f;
 174         struct v4l2_routing route;
 175
 176         route.input = INPUT(dev->ctl_input)->vmux;
 177         route.output = 0;
 178         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 179         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 180         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 181
 182         /* configure tuner */
 183         f.tuner = 0;
 184         f.type = V4L2_TUNER_ANALOG_TV;
 185         f.frequency = 9076;     /* FIXME:remove magic number */
 186         dev->ctl_freq = f.frequency;
 187         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 188
 189         /* configure tda9887 */
 190
 191
 192 /*      em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
 193 }
 194
 195 /*
 196  * em28xx_empty_framequeues()
 197  * prepare queues for incoming and outgoing frames
 198  */
 199 static void em28xx_empty_framequeues(struct em28xx *dev)
 200 {
 201         u32 i;
 202
 203         INIT_LIST_HEAD(&dev->inqueue);
 204         INIT_LIST_HEAD(&dev->outqueue);
 205
 206         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 207                 dev->frame[i].state = F_UNUSED;
 208                 dev->frame[i].buf.bytesused = 0;
 209         }
 210 }
 211
 212 static void video_mux(struct em28xx *dev, int index)
 213 {
 214         int ainput;
 215         struct v4l2_routing route;
 216
 217         route.input = INPUT(index)->vmux;
 218         route.output = 0;
 219         dev->ctl_input = index;
 220         dev->ctl_ainput = INPUT(index)->amux;
 221
 222         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 223
 224         em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,route.input,dev->ctl_ainput);
 225
 226         if (dev->has_msp34xx) {
 227                 if (dev->i2s_speed)
 228                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 229                 route.input = dev->ctl_ainput;
 230                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 231                 /* Note: this is msp3400 specific */
 232                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 233                 ainput = EM28XX_AUDIO_SRC_TUNER;
 234                 em28xx_audio_source(dev, ainput);
 235         } else {
 236                 switch (dev->ctl_ainput) {
 237                         case 0:
 238                                 ainput = EM28XX_AUDIO_SRC_TUNER;
 239                                 break;
 240                         default:
 241                                 ainput = EM28XX_AUDIO_SRC_LINE;
 242                 }
 243                 em28xx_audio_source(dev, ainput);
 244         }
 245 }
 246
 247 /*
 248  * em28xx_v4l2_open()
 249  * inits the device and starts isoc transfer
 250  */
 251 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 252 {
 253         int minor = iminor(inode);
 254         int errCode = 0;
 255         struct em28xx *h,*dev = NULL;
 256
 257         list_for_each_entry(h, &em28xx_devlist, devlist) {
 258                 if (h->vdev->minor == minor) {
 259                         dev  = h;
 260                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 261                 }
 262                 if (h->vbi_dev->minor == minor) {
 263                         dev  = h;
 264                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 265                 }
 266         }
 267         if (NULL == dev)
 268                 return -ENODEV;
 269
 270         em28xx_videodbg("open minor=%d type=%s users=%d\n",
 271                                 minor,v4l2_type_names[dev->type],dev->users);
 272
 273         if (!down_read_trylock(&em28xx_disconnect))
 274                 return -ERESTARTSYS;
 275
 276         if (dev->users) {
 277                 em28xx_warn("this driver can be opened only once\n");
 278                 up_read(&em28xx_disconnect);
 279                 return -EBUSY;
 280         }
 281
 282         mutex_init(&dev->fileop_lock);  /* to 1 == available */
 283         spin_lock_init(&dev->queue_lock);
 284         init_waitqueue_head(&dev->wait_frame);
 285         init_waitqueue_head(&dev->wait_stream);
 286
 287         mutex_lock(&dev->lock);
 288
 289         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 290                 em28xx_set_alternate(dev);
 291
 292                 dev->width = norm_maxw(dev);
 293                 dev->height = norm_maxh(dev);
 294                 dev->frame_size = dev->width * dev->height * 2;
 295                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 296                 dev->bytesperline = dev->width * 2;
 297                 dev->hscale = 0;
 298                 dev->vscale = 0;
 299
 300                 em28xx_capture_start(dev, 1);
 301                 em28xx_resolution_set(dev);
 302
 303                 /* device needs to be initialized before isoc transfer */
 304                 video_mux(dev, 0);
 305
 306                 /* start the transfer */
 307                 errCode = em28xx_init_isoc(dev);
 308                 if (errCode)
 309                         goto err;
 310
 311         }
 312
 313         dev->users++;
 314         filp->private_data = dev;
 315         dev->io = IO_NONE;
 316         dev->stream = STREAM_OFF;
 317         dev->num_frames = 0;
 318
 319         /* prepare queues */
 320         em28xx_empty_framequeues(dev);
 321
 322         dev->state |= DEV_INITIALIZED;
 323
 324 err:
 325         mutex_unlock(&dev->lock);
 326         up_read(&em28xx_disconnect);
 327         return errCode;
 328 }
 329
 330 /*
 331  * em28xx_realease_resources()
 332  * unregisters the v4l2,i2c and usb devices
 333  * called when the device gets disconected or at module unload
 334 */
 335 static void em28xx_release_resources(struct em28xx *dev)
 336 {
 337         mutex_lock(&em28xx_sysfs_lock);
 338
 339         /*FIXME: I2C IR should be disconnected */
 340
 341         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
 342                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
 343                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
 344         list_del(&dev->devlist);
 345         video_unregister_device(dev->vdev);
 346         video_unregister_device(dev->vbi_dev);
 347         em28xx_i2c_unregister(dev);
 348         usb_put_dev(dev->udev);
 349         mutex_unlock(&em28xx_sysfs_lock);
 350
 351
 352         /* Mark device as unused */
 353         em28xx_devused&=~(1<<dev->devno);
 354 }
 355
 356 /*
 357  * em28xx_v4l2_close()
 358  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 359  */
 360 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 361 {
 362         int errCode;
 363         struct em28xx *dev=filp->private_data;
 364
 365         em28xx_videodbg("users=%d\n", dev->users);
 366
 367         mutex_lock(&dev->lock);
 368
 369         em28xx_uninit_isoc(dev);
 370
 371         em28xx_release_buffers(dev);
 372
 373         /* the device is already disconnect, free the remaining resources */
 374         if (dev->state & DEV_DISCONNECTED) {
 375                 em28xx_release_resources(dev);
 376                 mutex_unlock(&dev->lock);
 377                 kfree(dev);
 378                 return 0;
 379         }
 380
 381         /* set alternate 0 */
 382         dev->alt = 0;
 383         em28xx_videodbg("setting alternate 0\n");
 384         errCode = usb_set_interface(dev->udev, 0, 0);
 385         if (errCode < 0) {
 386                 em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
 387                      errCode);
 388         }
 389
 390         dev->users--;
 391         wake_up_interruptible_nr(&dev->open, 1);
 392         mutex_unlock(&dev->lock);
 393         return 0;
 394 }
 395
 396 /*
 397  * em28xx_v4l2_read()
 398  * will allocate buffers when called for the first time
 399  */
 400 static ssize_t
 401 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
 402                  loff_t * f_pos)
 403 {
 404         struct em28xx_frame_t *f, *i;
 405         unsigned long lock_flags;
 406         int ret = 0;
 407         struct em28xx *dev = filp->private_data;
 408
 409         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 410                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
 411         }
 412         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 413                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
 414                 em28xx_videodbg("not supported yet! ...\n");
 415                 if (copy_to_user(buf, "", 1)) {
 416                         mutex_unlock(&dev->fileop_lock);
 417                         return -EFAULT;
 418                 }
 419                 return (1);
 420         }
 421         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 422                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
 423                 em28xx_videodbg("not supported yet! ...\n");
 424                 if (copy_to_user(buf, "", 1)) {
 425                         mutex_unlock(&dev->fileop_lock);
 426                         return -EFAULT;
 427                 }
 428                 return (1);
 429         }
 430
 431         if (mutex_lock_interruptible(&dev->fileop_lock))
 432                 return -ERESTARTSYS;
 433
 434         if (dev->state & DEV_DISCONNECTED) {
 435                 em28xx_videodbg("device not present\n");
 436                 mutex_unlock(&dev->fileop_lock);
 437                 return -ENODEV;
 438         }
 439
 440         if (dev->state & DEV_MISCONFIGURED) {
 441                 em28xx_videodbg("device misconfigured; close and open it again\n");
 442                 mutex_unlock(&dev->fileop_lock);
 443                 return -EIO;
 444         }
 445
 446         if (dev->io == IO_MMAP) {
 447                 em28xx_videodbg ("IO method is set to mmap; close and open"
 448                                 " the device again to choose the read method\n");
 449                 mutex_unlock(&dev->fileop_lock);
 450                 return -EINVAL;
 451         }
 452
 453         if (dev->io == IO_NONE) {
 454                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
 455                         em28xx_errdev("read failed, not enough memory\n");
 456                         mutex_unlock(&dev->fileop_lock);
 457                         return -ENOMEM;
 458                 }
 459                 dev->io = IO_READ;
 460                 dev->stream = STREAM_ON;
 461                 em28xx_queue_unusedframes(dev);
 462         }
 463
 464         if (!count) {
 465                 mutex_unlock(&dev->fileop_lock);
 466                 return 0;
 467         }
 468
 469         if (list_empty(&dev->outqueue)) {
 470                 if (filp->f_flags & O_NONBLOCK) {
 471                         mutex_unlock(&dev->fileop_lock);
 472                         return -EAGAIN;
 473                 }
 474                 ret = wait_event_interruptible
 475                     (dev->wait_frame,
 476                      (!list_empty(&dev->outqueue)) ||
 477                      (dev->state & DEV_DISCONNECTED));
 478                 if (ret) {
 479                         mutex_unlock(&dev->fileop_lock);
 480                         return ret;
 481                 }
 482                 if (dev->state & DEV_DISCONNECTED) {
 483                         mutex_unlock(&dev->fileop_lock);
 484                         return -ENODEV;
 485                 }
 486         }
 487
 488         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
 489
 490         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 491         list_for_each_entry(i, &dev->outqueue, frame)
 492             i->state = F_UNUSED;
 493         INIT_LIST_HEAD(&dev->outqueue);
 494         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 495
 496         em28xx_queue_unusedframes(dev);
 497
 498         if (count > f->buf.length)
 499                 count = f->buf.length;
 500
 501         if (copy_to_user(buf, f->bufmem, count)) {
 502                 mutex_unlock(&dev->fileop_lock);
 503                 return -EFAULT;
 504         }
 505         *f_pos += count;
 506
 507         mutex_unlock(&dev->fileop_lock);
 508
 509         return count;
 510 }
 511
 512 /*
 513  * em28xx_v4l2_poll()
 514  * will allocate buffers when called for the first time
 515  */
 516 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
 517 {
 518         unsigned int mask = 0;
 519         struct em28xx *dev = filp->private_data;
 520
 521         if (mutex_lock_interruptible(&dev->fileop_lock))
 522                 return POLLERR;
 523
 524         if (dev->state & DEV_DISCONNECTED) {
 525                 em28xx_videodbg("device not present\n");
 526         } else if (dev->state & DEV_MISCONFIGURED) {
 527                 em28xx_videodbg("device is misconfigured; close and open it again\n");
 528         } else {
 529                 if (dev->io == IO_NONE) {
 530                         if (!em28xx_request_buffers
 531                             (dev, EM28XX_NUM_READ_FRAMES)) {
 532                                 em28xx_warn
 533                                     ("poll() failed, not enough memory\n");
 534                         } else {
 535                                 dev->io = IO_READ;
 536                                 dev->stream = STREAM_ON;
 537                         }
 538                 }
 539
 540                 if (dev->io == IO_READ) {
 541                         em28xx_queue_unusedframes(dev);
 542                         poll_wait(filp, &dev->wait_frame, wait);
 543
 544                         if (!list_empty(&dev->outqueue))
 545                                 mask |= POLLIN | POLLRDNORM;
 546
 547                         mutex_unlock(&dev->fileop_lock);
 548
 549                         return mask;
 550                 }
 551         }
 552
 553         mutex_unlock(&dev->fileop_lock);
 554         return POLLERR;
 555 }
 556
 557 /*
 558  * em28xx_vm_open()
 559  */
 560 static void em28xx_vm_open(struct vm_area_struct *vma)
 561 {
 562         struct em28xx_frame_t *f = vma->vm_private_data;
 563         f->vma_use_count++;
 564 }
 565
 566 /*
 567  * em28xx_vm_close()
 568  */
 569 static void em28xx_vm_close(struct vm_area_struct *vma)
 570 {
 571         /* NOTE: buffers are not freed here */
 572         struct em28xx_frame_t *f = vma->vm_private_data;
 573         f->vma_use_count--;
 574 }
 575
 576 static struct vm_operations_struct em28xx_vm_ops = {
 577         .open = em28xx_vm_open,
 578         .close = em28xx_vm_close,
 579 };
 580
 581 /*
 582  * em28xx_v4l2_mmap()
 583  */
 584 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 585 {
 586         unsigned long size = vma->vm_end - vma->vm_start,
 587             start = vma->vm_start;
 588         void *pos;
 589         u32 i;
 590
 591         struct em28xx *dev = filp->private_data;
 592
 593         if (mutex_lock_interruptible(&dev->fileop_lock))
 594                 return -ERESTARTSYS;
 595
 596         if (dev->state & DEV_DISCONNECTED) {
 597                 em28xx_videodbg("mmap: device not present\n");
 598                 mutex_unlock(&dev->fileop_lock);
 599                 return -ENODEV;
 600         }
 601
 602         if (dev->state & DEV_MISCONFIGURED) {
 603                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
 604                                                 "open it again\n");
 605                 mutex_unlock(&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                 mutex_unlock(&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                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
 621                 mutex_unlock(&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 = dev->frame[i].bufmem;
 630         while (size > 0) {      /* size is page-aligned */
 631                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
 632                         em28xx_videodbg("mmap: vm_insert_page failed\n");
 633                         mutex_unlock(&dev->fileop_lock);
 634                         return -EAGAIN;
 635                 }
 636                 start += PAGE_SIZE;
 637                 pos += PAGE_SIZE;
 638                 size -= PAGE_SIZE;
 639         }
 640
 641         vma->vm_ops = &em28xx_vm_ops;
 642         vma->vm_private_data = &dev->frame[i];
 643
 644         em28xx_vm_open(vma);
 645         mutex_unlock(&dev->fileop_lock);
 646         return 0;
 647 }
 648
 649 /*
 650  * em28xx_get_ctrl()
 651  * return the current saturation, brightness or contrast, mute state
 652  */
 653 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 654 {
 655         switch (ctrl->id) {
 656         case V4L2_CID_AUDIO_MUTE:
 657                 ctrl->value = dev->mute;
 658                 return 0;
 659         case V4L2_CID_AUDIO_VOLUME:
 660                 ctrl->value = dev->volume;
 661                 return 0;
 662         default:
 663                 return -EINVAL;
 664         }
 665 }
 666
 667 /*
 668  * em28xx_set_ctrl()
 669  * mute or set new saturation, brightness or contrast
 670  */
 671 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 672 {
 673         switch (ctrl->id) {
 674         case V4L2_CID_AUDIO_MUTE:
 675                 if (ctrl->value != dev->mute) {
 676                         dev->mute = ctrl->value;
 677                         em28xx_audio_usb_mute(dev, ctrl->value);
 678                         return em28xx_audio_analog_set(dev);
 679                 }
 680                 return 0;
 681         case V4L2_CID_AUDIO_VOLUME:
 682                 dev->volume = ctrl->value;
 683                 return em28xx_audio_analog_set(dev);
 684         default:
 685                 return -EINVAL;
 686         }
 687 }
 688
 689 /*
 690  * em28xx_stream_interrupt()
 691  * stops streaming
 692  */
 693 static int em28xx_stream_interrupt(struct em28xx *dev)
 694 {
 695         int ret = 0;
 696
 697         /* stop reading from the device */
 698
 699         dev->stream = STREAM_INTERRUPT;
 700         ret = wait_event_timeout(dev->wait_stream,
 701                                  (dev->stream == STREAM_OFF) ||
 702                                  (dev->state & DEV_DISCONNECTED),
 703                                  EM28XX_URB_TIMEOUT);
 704         if (dev->state & DEV_DISCONNECTED)
 705                 return -ENODEV;
 706         else if (ret) {
 707                 dev->state |= DEV_MISCONFIGURED;
 708                 em28xx_videodbg("device is misconfigured; close and "
 709                         "open /dev/video%d again\n",
 710                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 711                 return ret;
 712         }
 713
 714         return 0;
 715 }
 716
 717 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
 718 {
 719         unsigned int hscale, vscale;
 720         unsigned int maxh, maxw;
 721
 722         maxw = norm_maxw(dev);
 723         maxh = norm_maxh(dev);
 724
 725         /* width must even because of the YUYV format */
 726         /* height must be even because of interlacing */
 727         height &= 0xfffe;
 728         width &= 0xfffe;
 729
 730         if (height < 32)
 731                 height = 32;
 732         if (height > maxh)
 733                 height = maxh;
 734         if (width < 48)
 735                 width = 48;
 736         if (width > maxw)
 737                 width = maxw;
 738
 739         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 740                 hscale = 0x3fff;
 741         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 742
 743         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 744                 vscale = 0x3fff;
 745         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 746
 747         /* set new image size */
 748         dev->width = width;
 749         dev->height = height;
 750         dev->frame_size = dev->width * dev->height * 2;
 751         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 752         dev->bytesperline = dev->width * 2;
 753         dev->hscale = hscale;
 754         dev->vscale = vscale;
 755
 756         em28xx_resolution_set(dev);
 757
 758         return 0;
 759 }
 760
 761 static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
 762 {
 763         em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
 764                 (format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
 765                 "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 766                 (format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
 767                 "V4L2_BUF_TYPE_VBI_CAPTURE" :
 768                 (format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
 769                 "V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
 770                 "not supported");
 771
 772         switch (format->type) {
 773         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 774         {
 775                 format->fmt.pix.width = dev->width;
 776                 format->fmt.pix.height = dev->height;
 777                 format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 778                 format->fmt.pix.bytesperline = dev->bytesperline;
 779                 format->fmt.pix.sizeimage = dev->frame_size;
 780                 format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 781                 format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 782
 783                 em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
 784                         dev->height);
 785                 break;
 786         }
 787
 788         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 789         {
 790                 format->fmt.sliced.service_set=0;
 791
 792                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 793
 794                 if (format->fmt.sliced.service_set==0)
 795                         return -EINVAL;
 796
 797                 break;
 798         }
 799
 800         default:
 801                 return -EINVAL;
 802         }
 803         return (0);
 804 }
 805
 806 static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
 807 {
 808         u32 i;
 809         int ret = 0;
 810         int width = format->fmt.pix.width;
 811         int height = format->fmt.pix.height;
 812         unsigned int hscale, vscale;
 813         unsigned int maxh, maxw;
 814
 815         maxw = norm_maxw(dev);
 816         maxh = norm_maxh(dev);
 817
 818         em28xx_videodbg("%s: type=%s\n",
 819                         cmd == VIDIOC_TRY_FMT ?
 820                         "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 821                         format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
 822                         "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 823                         format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
 824                         "V4L2_BUF_TYPE_VBI_CAPTURE " :
 825                         "not supported");
 826
 827         if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 828                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 829
 830                 if (format->fmt.sliced.service_set==0)
 831                         return -EINVAL;
 832
 833                 return 0;
 834         }
 835
 836
 837         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 838                 return -EINVAL;
 839
 840         em28xx_videodbg("%s: requested %dx%d\n",
 841                 cmd == VIDIOC_TRY_FMT ?
 842                 "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 843                 format->fmt.pix.width, format->fmt.pix.height);
 844
 845         /* FIXME: Move some code away from here */
 846         /* width must even because of the YUYV format */
 847         /* height must be even because of interlacing */
 848         height &= 0xfffe;
 849         width &= 0xfffe;
 850
 851         if (height < 32)
 852                 height = 32;
 853         if (height > maxh)
 854                 height = maxh;
 855         if (width < 48)
 856                 width = 48;
 857         if (width > maxw)
 858                 width = maxw;
 859
 860         if(dev->is_em2800){
 861                 /* the em2800 can only scale down to 50% */
 862                 if(height % (maxh / 2))
 863                         height=maxh;
 864                 if(width % (maxw / 2))
 865                         width=maxw;
 866                 /* according to empiatech support */
 867                 /* the MaxPacketSize is to small to support */
 868                 /* framesizes larger than 640x480 @ 30 fps */
 869                 /* or 640x576 @ 25 fps. As this would cut */
 870                 /* of a part of the image we prefer */
 871                 /* 360x576 or 360x480 for now */
 872                 if(width == maxw && height == maxh)
 873                         width /= 2;
 874         }
 875
 876         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 877                 hscale = 0x3fff;
 878
 879         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 880
 881         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 882                 vscale = 0x3fff;
 883
 884         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 885
 886         format->fmt.pix.width = width;
 887         format->fmt.pix.height = height;
 888         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 889         format->fmt.pix.bytesperline = width * 2;
 890         format->fmt.pix.sizeimage = width * 2 * height;
 891         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 892         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
 893
 894         em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
 895                 cmd == VIDIOC_TRY_FMT ?
 896                 "VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
 897                 format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);
 898
 899         if (cmd == VIDIOC_TRY_FMT)
 900                 return 0;
 901
 902         for (i = 0; i < dev->num_frames; i++)
 903                 if (dev->frame[i].vma_use_count) {
 904                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 905                                 "Unmap the buffers first.\n");
 906                         return -EINVAL;
 907                 }
 908
 909         /* stop io in case it is already in progress */
 910         if (dev->stream == STREAM_ON) {
 911                 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
 912                 if ((ret = em28xx_stream_interrupt(dev)))
 913                         return ret;
 914         }
 915
 916         em28xx_release_buffers(dev);
 917         dev->io = IO_NONE;
 918
 919         /* set new image size */
 920         dev->width = width;
 921         dev->height = height;
 922         dev->frame_size = dev->width * dev->height * 2;
 923         dev->field_size = dev->frame_size >> 1;
 924         dev->bytesperline = dev->width * 2;
 925         dev->hscale = hscale;
 926         dev->vscale = vscale;
 927         em28xx_uninit_isoc(dev);
 928         em28xx_set_alternate(dev);
 929         em28xx_capture_start(dev, 1);
 930         em28xx_resolution_set(dev);
 931         em28xx_init_isoc(dev);
 932
 933         return 0;
 934 }
 935
 936 /*
 937  * em28xx_v4l2_do_ioctl()
 938  * This function is _not_ called directly, but from
 939  * em28xx_v4l2_ioctl. Userspace
 940  * copying is done already, arg is a kernel pointer.
 941  */
 942 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
 943                            struct em28xx *dev, unsigned int cmd, void *arg,
 944                            v4l2_kioctl driver_ioctl)
 945 {
 946         int ret;
 947
 948         switch (cmd) {
 949                 /* ---------- tv norms ---------- */
 950         case VIDIOC_ENUMSTD:
 951         {
 952                 struct v4l2_standard *e = arg;
 953                 unsigned int i;
 954
 955                 i = e->index;
 956                 if (i >= TVNORMS)
 957                         return -EINVAL;
 958                 ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 959                                                 tvnorms[e->index].name);
 960                 e->index = i;
 961                 if (ret < 0)
 962                         return ret;
 963                 return 0;
 964         }
 965         case VIDIOC_G_STD:
 966         {
 967                 v4l2_std_id *id = arg;
 968
 969                 *id = dev->tvnorm->id;
 970                 return 0;
 971         }
 972         case VIDIOC_S_STD:
 973         {
 974                 v4l2_std_id *id = arg;
 975                 unsigned int i;
 976
 977                 for (i = 0; i < TVNORMS; i++)
 978                         if (*id == tvnorms[i].id)
 979                                 break;
 980                 if (i == TVNORMS)
 981                         for (i = 0; i < TVNORMS; i++)
 982                                 if (*id & tvnorms[i].id)
 983                                         break;
 984                 if (i == TVNORMS)
 985                         return -EINVAL;
 986
 987                 mutex_lock(&dev->lock);
 988                 dev->tvnorm = &tvnorms[i];
 989
 990                 em28xx_set_norm(dev, dev->width, dev->height);
 991
 992                 em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
 993                                         &dev->tvnorm->id);
 994
 995                 mutex_unlock(&dev->lock);
 996
 997                 return 0;
 998         }
 999
1000         /* ------ input switching ---------- */
1001         case VIDIOC_ENUMINPUT:
1002         {
1003                 struct v4l2_input *i = arg;
1004                 unsigned int n;
1005                 static const char *iname[] = {
1006                         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
1007                         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
1008                         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
1009                         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
1010                         [EM28XX_VMUX_SVIDEO] = "S-Video",
1011                         [EM28XX_VMUX_TELEVISION] = "Television",
1012                         [EM28XX_VMUX_CABLE] = "Cable TV",
1013                         [EM28XX_VMUX_DVB] = "DVB",
1014                         [EM28XX_VMUX_DEBUG] = "for debug only",
1015                 };
1016
1017                 n = i->index;
1018                 if (n >= MAX_EM28XX_INPUT)
1019                         return -EINVAL;
1020                 if (0 == INPUT(n)->type)
1021                         return -EINVAL;
1022                 memset(i, 0, sizeof(*i));
1023                 i->index = n;
1024                 i->type = V4L2_INPUT_TYPE_CAMERA;
1025                 strcpy(i->name, iname[INPUT(n)->type]);
1026                 if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
1027                         (EM28XX_VMUX_CABLE == INPUT(n)->type))
1028                         i->type = V4L2_INPUT_TYPE_TUNER;
1029                 for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
1030                         i->std |= tvnorms[n].id;
1031                 return 0;
1032         }
1033         case VIDIOC_G_INPUT:
1034         {
1035                 int *i = arg;
1036                 *i = dev->ctl_input;
1037
1038                 return 0;
1039         }
1040         case VIDIOC_S_INPUT:
1041         {
1042                 int *index = arg;
1043
1044                 if (*index >= MAX_EM28XX_INPUT)
1045                         return -EINVAL;
1046                 if (0 == INPUT(*index)->type)
1047                         return -EINVAL;
1048
1049                 mutex_lock(&dev->lock);
1050                 video_mux(dev, *index);
1051                 mutex_unlock(&dev->lock);
1052
1053                 return 0;
1054         }
1055         case VIDIOC_G_AUDIO:
1056         {
1057                 struct v4l2_audio *a = arg;
1058                 unsigned int index = a->index;
1059
1060                 if (a->index > 1)
1061                         return -EINVAL;
1062                 memset(a, 0, sizeof(*a));
1063                 index = dev->ctl_ainput;
1064
1065                 if (index == 0) {
1066                         strcpy(a->name, "Television");
1067                 } else {
1068                         strcpy(a->name, "Line In");
1069                 }
1070                 a->capability = V4L2_AUDCAP_STEREO;
1071                 a->index = index;
1072                 return 0;
1073         }
1074         case VIDIOC_S_AUDIO:
1075         {
1076                 struct v4l2_audio *a = arg;
1077
1078                 if (a->index != dev->ctl_ainput)
1079                         return -EINVAL;
1080
1081                 return 0;
1082         }
1083
1084         /* --- controls ---------------------------------------------- */
1085         case VIDIOC_QUERYCTRL:
1086         {
1087                 struct v4l2_queryctrl *qc = arg;
1088                 int i, id=qc->id;
1089
1090                 memset(qc,0,sizeof(*qc));
1091                 qc->id=id;
1092
1093                 if (!dev->has_msp34xx) {
1094                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1095                                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1096                                         memcpy(qc, &(em28xx_qctrl[i]),
1097                                         sizeof(*qc));
1098                                         return 0;
1099                                 }
1100                         }
1101                 }
1102                 em28xx_i2c_call_clients(dev,cmd,qc);
1103                 if (qc->type)
1104                         return 0;
1105                 else
1106                         return -EINVAL;
1107         }
1108         case VIDIOC_G_CTRL:
1109         {
1110                 struct v4l2_control *ctrl = arg;
1111                 int retval=-EINVAL;
1112
1113                 if (!dev->has_msp34xx)
1114                         retval=em28xx_get_ctrl(dev, ctrl);
1115                 if (retval==-EINVAL) {
1116                         em28xx_i2c_call_clients(dev,cmd,arg);
1117                         return 0;
1118                 } else return retval;
1119         }
1120         case VIDIOC_S_CTRL:
1121         {
1122                 struct v4l2_control *ctrl = arg;
1123                 u8 i;
1124
1125                 if (!dev->has_msp34xx){
1126                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1127                                 if (ctrl->id == em28xx_qctrl[i].id) {
1128                                         if (ctrl->value <
1129                                         em28xx_qctrl[i].minimum
1130                                         || ctrl->value >
1131                                         em28xx_qctrl[i].maximum)
1132                                                 return -ERANGE;
1133                                         return em28xx_set_ctrl(dev, ctrl);
1134                                 }
1135                         }
1136                 }
1137
1138                 em28xx_i2c_call_clients(dev,cmd,arg);
1139                 return 0;
1140         }
1141         /* --- tuner ioctls ------------------------------------------ */
1142         case VIDIOC_G_TUNER:
1143         {
1144                 struct v4l2_tuner *t = arg;
1145
1146                 if (0 != t->index)
1147                         return -EINVAL;
1148
1149                 memset(t, 0, sizeof(*t));
1150                 strcpy(t->name, "Tuner");
1151                 mutex_lock(&dev->lock);
1152                 /* let clients fill in the remainder of this struct */
1153                 em28xx_i2c_call_clients(dev, cmd, t);
1154                 mutex_unlock(&dev->lock);
1155                 em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
1156                                 t->afc);
1157                 return 0;
1158         }
1159         case VIDIOC_S_TUNER:
1160         {
1161                 struct v4l2_tuner *t = arg;
1162
1163                 if (0 != t->index)
1164                         return -EINVAL;
1165                 mutex_lock(&dev->lock);
1166                 /* let clients handle this */
1167                 em28xx_i2c_call_clients(dev, cmd, t);
1168                 mutex_unlock(&dev->lock);
1169                 return 0;
1170         }
1171         case VIDIOC_G_FREQUENCY:
1172         {
1173                 struct v4l2_frequency *f = arg;
1174
1175                 memset(f, 0, sizeof(*f));
1176                 f->type = V4L2_TUNER_ANALOG_TV;
1177                 f->frequency = dev->ctl_freq;
1178
1179                 return 0;
1180         }
1181         case VIDIOC_S_FREQUENCY:
1182         {
1183                 struct v4l2_frequency *f = arg;
1184
1185                 if (0 != f->tuner)
1186                         return -EINVAL;
1187
1188                 if (V4L2_TUNER_ANALOG_TV != f->type)
1189                         return -EINVAL;
1190
1191                 mutex_lock(&dev->lock);
1192                 dev->ctl_freq = f->frequency;
1193                 em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1194                 mutex_unlock(&dev->lock);
1195                 return 0;
1196         }
1197         case VIDIOC_CROPCAP:
1198         {
1199                 struct v4l2_cropcap *cc = arg;
1200
1201                 if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1202                         return -EINVAL;
1203                 cc->bounds.left = 0;
1204                 cc->bounds.top = 0;
1205                 cc->bounds.width = dev->width;
1206                 cc->bounds.height = dev->height;
1207                 cc->defrect = cc->bounds;
1208                 cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1209                 cc->pixelaspect.denominator = 59;
1210                 return 0;
1211         }
1212         case VIDIOC_STREAMON:
1213         {
1214                 int *type = arg;
1215
1216                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1217                         || dev->io != IO_MMAP)
1218                         return -EINVAL;
1219
1220                 if (list_empty(&dev->inqueue))
1221                         return -EINVAL;
1222
1223                 dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1224
1225                 em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");
1226
1227                 return 0;
1228         }
1229         case VIDIOC_STREAMOFF:
1230         {
1231                 int *type = arg;
1232                 int ret;
1233
1234                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1235                         || dev->io != IO_MMAP)
1236                         return -EINVAL;
1237
1238                 if (dev->stream == STREAM_ON) {
1239                         em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
1240                         if ((ret = em28xx_stream_interrupt(dev)))
1241                                 return ret;
1242                 }
1243                 em28xx_empty_framequeues(dev);
1244
1245                 return 0;
1246         }
1247         default:
1248                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1249                                                   driver_ioctl);
1250         }
1251         return 0;
1252 }
1253
1254 /*
1255  * em28xx_v4l2_do_ioctl()
1256  * This function is _not_ called directly, but from
1257  * em28xx_v4l2_ioctl. Userspace
1258  * copying is done already, arg is a kernel pointer.
1259  */
1260 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1261                                  unsigned int cmd, void *arg)
1262 {
1263         struct em28xx *dev = filp->private_data;
1264
1265         if (!dev)
1266                 return -ENODEV;
1267
1268         if (video_debug > 1)
1269                 v4l_print_ioctl(dev->name,cmd);
1270
1271         switch (cmd) {
1272
1273                 /* --- capabilities ------------------------------------------ */
1274         case VIDIOC_QUERYCAP:
1275                 {
1276                 struct v4l2_capability *cap = arg;
1277
1278                 memset(cap, 0, sizeof(*cap));
1279                 strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1280                 strlcpy(cap->card, em28xx_boards[dev->model].name,
1281                         sizeof(cap->card));
1282                 strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1283                         sizeof(cap->bus_info));
1284                 cap->version = EM28XX_VERSION_CODE;
1285                 cap->capabilities =
1286                                 V4L2_CAP_SLICED_VBI_CAPTURE |
1287                                 V4L2_CAP_VIDEO_CAPTURE |
1288                                 V4L2_CAP_AUDIO |
1289                                 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1290                 if (dev->has_tuner)
1291                         cap->capabilities |= V4L2_CAP_TUNER;
1292                 return 0;
1293         }
1294         /* --- capture ioctls ---------------------------------------- */
1295         case VIDIOC_ENUM_FMT:
1296         {
1297                 struct v4l2_fmtdesc *fmtd = arg;
1298
1299                 if (fmtd->index != 0)
1300                         return -EINVAL;
1301                 memset(fmtd, 0, sizeof(*fmtd));
1302                 fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1303                 strcpy(fmtd->description, "Packed YUY2");
1304                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1305                 memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1306                 return 0;
1307         }
1308         case VIDIOC_G_FMT:
1309                 return em28xx_get_fmt(dev, (struct v4l2_format *) arg);
1310
1311         case VIDIOC_TRY_FMT:
1312         case VIDIOC_S_FMT:
1313                 return em28xx_set_fmt(dev, cmd, (struct v4l2_format *)arg);
1314
1315         case VIDIOC_REQBUFS:
1316         {
1317                 struct v4l2_requestbuffers *rb = arg;
1318                 u32 i;
1319                 int ret;
1320
1321                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1322                         rb->memory != V4L2_MEMORY_MMAP)
1323                         return -EINVAL;
1324
1325                 if (dev->io == IO_READ) {
1326                         em28xx_videodbg ("method is set to read;"
1327                                 " close and open the device again to"
1328                                 " choose the mmap I/O method\n");
1329                         return -EINVAL;
1330                 }
1331
1332                 for (i = 0; i < dev->num_frames; i++)
1333                         if (dev->frame[i].vma_use_count) {
1334                                 em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
1335                                 return -EINVAL;
1336                         }
1337
1338                 if (dev->stream == STREAM_ON) {
1339                         em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1340                         if ((ret = em28xx_stream_interrupt(dev)))
1341                                 return ret;
1342                 }
1343
1344                 em28xx_empty_framequeues(dev);
1345
1346                 em28xx_release_buffers(dev);
1347                 if (rb->count)
1348                         rb->count =
1349                                 em28xx_request_buffers(dev, rb->count);
1350
1351                 dev->frame_current = NULL;
1352
1353                 em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
1354                                                 rb->count);
1355                 dev->io = rb->count ? IO_MMAP : IO_NONE;
1356                 return 0;
1357         }
1358         case VIDIOC_QUERYBUF:
1359         {
1360                 struct v4l2_buffer *b = arg;
1361
1362                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1363                         b->index >= dev->num_frames || dev->io != IO_MMAP)
1364                         return -EINVAL;
1365
1366                 memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1367
1368                 if (dev->frame[b->index].vma_use_count) {
1369                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1370                 }
1371                 if (dev->frame[b->index].state == F_DONE)
1372                         b->flags |= V4L2_BUF_FLAG_DONE;
1373                 else if (dev->frame[b->index].state != F_UNUSED)
1374                         b->flags |= V4L2_BUF_FLAG_QUEUED;
1375                 return 0;
1376         }
1377         case VIDIOC_QBUF:
1378         {
1379                 struct v4l2_buffer *b = arg;
1380                 unsigned long lock_flags;
1381
1382                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1383                         b->index >= dev->num_frames || dev->io != IO_MMAP) {
1384                         return -EINVAL;
1385                 }
1386
1387                 if (dev->frame[b->index].state != F_UNUSED) {
1388                         return -EAGAIN;
1389                 }
1390                 dev->frame[b->index].state = F_QUEUED;
1391
1392                 /* add frame to fifo */
1393                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1394                 list_add_tail(&dev->frame[b->index].frame,
1395                                 &dev->inqueue);
1396                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1397
1398                 return 0;
1399         }
1400         case VIDIOC_DQBUF:
1401         {
1402                 struct v4l2_buffer *b = arg;
1403                 struct em28xx_frame_t *f;
1404                 unsigned long lock_flags;
1405                 int ret = 0;
1406
1407                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1408                         || dev->io != IO_MMAP)
1409                         return -EINVAL;
1410
1411                 if (list_empty(&dev->outqueue)) {
1412                         if (dev->stream == STREAM_OFF)
1413                                 return -EINVAL;
1414                         if (filp->f_flags & O_NONBLOCK)
1415                                 return -EAGAIN;
1416                         ret = wait_event_interruptible
1417                                 (dev->wait_frame,
1418                                 (!list_empty(&dev->outqueue)) ||
1419                                 (dev->state & DEV_DISCONNECTED));
1420                         if (ret)
1421                                 return ret;
1422                         if (dev->state & DEV_DISCONNECTED)
1423                                 return -ENODEV;
1424                 }
1425
1426                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1427                 f = list_entry(dev->outqueue.next,
1428                                 struct em28xx_frame_t, frame);
1429                 list_del(dev->outqueue.next);
1430                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1431
1432                 f->state = F_UNUSED;
1433                 memcpy(b, &f->buf, sizeof(*b));
1434
1435                 if (f->vma_use_count)
1436                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1437
1438                 return 0;
1439         }
1440         default:
1441                 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1442                                        em28xx_video_do_ioctl);
1443         }
1444         return 0;
1445 }
1446
1447 /*
1448  * em28xx_v4l2_ioctl()
1449  * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1450  */
1451 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1452                              unsigned int cmd, unsigned long arg)
1453 {
1454         int ret = 0;
1455         struct em28xx *dev = filp->private_data;
1456
1457         if (mutex_lock_interruptible(&dev->fileop_lock))
1458                 return -ERESTARTSYS;
1459
1460         if (dev->state & DEV_DISCONNECTED) {
1461                 em28xx_errdev("v4l2 ioctl: device not present\n");
1462                 mutex_unlock(&dev->fileop_lock);
1463                 return -ENODEV;
1464         }
1465
1466         if (dev->state & DEV_MISCONFIGURED) {
1467                 em28xx_errdev
1468                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1469                 mutex_unlock(&dev->fileop_lock);
1470                 return -EIO;
1471         }
1472
1473         ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1474
1475         mutex_unlock(&dev->fileop_lock);
1476
1477         return ret;
1478 }
1479
1480 static const struct file_operations em28xx_v4l_fops = {
1481         .owner = THIS_MODULE,
1482         .open = em28xx_v4l2_open,
1483         .release = em28xx_v4l2_close,
1484         .ioctl = em28xx_v4l2_ioctl,
1485         .read = em28xx_v4l2_read,
1486         .poll = em28xx_v4l2_poll,
1487         .mmap = em28xx_v4l2_mmap,
1488         .llseek = no_llseek,
1489         .compat_ioctl   = v4l_compat_ioctl32,
1490
1491 };
1492
1493 /******************************** usb interface *****************************************/
1494
1495 /*
1496  * em28xx_init_dev()
1497  * allocates and inits the device structs, registers i2c bus and v4l device
1498  */
1499 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1500                            int minor, int model)
1501 {
1502         struct em28xx *dev = *devhandle;
1503         int retval = -ENOMEM;
1504         int errCode, i;
1505         unsigned int maxh, maxw;
1506
1507         dev->udev = udev;
1508         dev->model = model;
1509         mutex_init(&dev->lock);
1510         init_waitqueue_head(&dev->open);
1511
1512         dev->em28xx_write_regs = em28xx_write_regs;
1513         dev->em28xx_read_reg = em28xx_read_reg;
1514         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1515         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1516         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1517         dev->is_em2800 = em28xx_boards[model].is_em2800;
1518         dev->has_tuner = em28xx_boards[model].has_tuner;
1519         dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
1520         dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
1521         dev->decoder = em28xx_boards[model].decoder;
1522
1523         if (tuner >= 0)
1524                 dev->tuner_type = tuner;
1525         else
1526                 dev->tuner_type = em28xx_boards[model].tuner_type;
1527
1528         dev->video_inputs = em28xx_boards[model].vchannels;
1529
1530         for (i = 0; i < TVNORMS; i++)
1531                 if (em28xx_boards[model].norm == tvnorms[i].mode)
1532                         break;
1533         if (i == TVNORMS)
1534                 i = 0;
1535
1536         dev->tvnorm = &tvnorms[i];      /* set default norm */
1537
1538         em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1539
1540         maxw = norm_maxw(dev);
1541         maxh = norm_maxh(dev);
1542
1543         /* set default image size */
1544         dev->width = maxw;
1545         dev->height = maxh;
1546         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1547         dev->field_size = dev->width * dev->height;
1548         dev->frame_size =
1549             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1550         dev->bytesperline = dev->width * 2;
1551         dev->hscale = 0;
1552         dev->vscale = 0;
1553         dev->ctl_input = 2;
1554
1555         /* setup video picture settings for saa7113h */
1556         memset(&dev->vpic, 0, sizeof(dev->vpic));
1557         dev->vpic.colour = 128 << 8;
1558         dev->vpic.hue = 128 << 8;
1559         dev->vpic.brightness = 128 << 8;
1560         dev->vpic.contrast = 192 << 8;
1561         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1562         dev->vpic.depth = 16;
1563         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1564
1565         em28xx_pre_card_setup(dev);
1566 #ifdef CONFIG_MODULES
1567         /* request some modules */
1568         if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
1569                 request_module("saa7115");
1570         if (dev->decoder == EM28XX_TVP5150)
1571                 request_module("tvp5150");
1572         if (dev->has_tuner)
1573                 request_module("tuner");
1574 #endif
1575         errCode = em28xx_config(dev);
1576         if (errCode) {
1577                 em28xx_errdev("error configuring device\n");
1578                 em28xx_devused&=~(1<<dev->devno);
1579                 kfree(dev);
1580                 return -ENOMEM;
1581         }
1582
1583         mutex_lock(&dev->lock);
1584         /* register i2c bus */
1585         em28xx_i2c_register(dev);
1586
1587         /* Do board specific init and eeprom reading */
1588         em28xx_card_setup(dev);
1589
1590         /* configure the device */
1591         em28xx_config_i2c(dev);
1592
1593         mutex_unlock(&dev->lock);
1594
1595         errCode = em28xx_config(dev);
1596
1597 #ifdef CONFIG_MODULES
1598         if (dev->has_msp34xx)
1599                 request_module("msp3400");
1600 #endif
1601         /* allocate and fill v4l2 device struct */
1602         dev->vdev = video_device_alloc();
1603         if (NULL == dev->vdev) {
1604                 em28xx_errdev("cannot allocate video_device.\n");
1605                 em28xx_devused&=~(1<<dev->devno);
1606                 kfree(dev);
1607                 return -ENOMEM;
1608         }
1609
1610         dev->vbi_dev = video_device_alloc();
1611         if (NULL == dev->vbi_dev) {
1612                 em28xx_errdev("cannot allocate video_device.\n");
1613                 kfree(dev->vdev);
1614                 em28xx_devused&=~(1<<dev->devno);
1615                 kfree(dev);
1616                 return -ENOMEM;
1617         }
1618
1619         /* Fills VBI device info */
1620         dev->vbi_dev->type = VFL_TYPE_VBI;
1621         dev->vbi_dev->fops = &em28xx_v4l_fops;
1622         dev->vbi_dev->minor = -1;
1623         dev->vbi_dev->dev = &dev->udev->dev;
1624         dev->vbi_dev->release = video_device_release;
1625         snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1626                                                          "em28xx",dev->devno,"vbi");
1627
1628         /* Fills CAPTURE device info */
1629         dev->vdev->type = VID_TYPE_CAPTURE;
1630         if (dev->has_tuner)
1631                 dev->vdev->type |= VID_TYPE_TUNER;
1632         dev->vdev->fops = &em28xx_v4l_fops;
1633         dev->vdev->minor = -1;
1634         dev->vdev->dev = &dev->udev->dev;
1635         dev->vdev->release = video_device_release;
1636         snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1637                                                          "em28xx",dev->devno,"video");
1638
1639         list_add_tail(&dev->devlist,&em28xx_devlist);
1640
1641         /* register v4l2 device */
1642         mutex_lock(&dev->lock);
1643         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1644                                          video_nr[dev->devno]))) {
1645                 em28xx_errdev("unable to register video device (error=%i).\n",
1646                               retval);
1647                 mutex_unlock(&dev->lock);
1648                 list_del(&dev->devlist);
1649                 video_device_release(dev->vdev);
1650                 em28xx_devused&=~(1<<dev->devno);
1651                 kfree(dev);
1652                 return -ENODEV;
1653         }
1654
1655         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1656                                         vbi_nr[dev->devno]) < 0) {
1657                 printk("unable to register vbi device\n");
1658                 mutex_unlock(&dev->lock);
1659                 list_del(&dev->devlist);
1660                 video_device_release(dev->vbi_dev);
1661                 video_device_release(dev->vdev);
1662                 em28xx_devused&=~(1<<dev->devno);
1663                 kfree(dev);
1664                 return -ENODEV;
1665         } else {
1666                 printk("registered VBI\n");
1667         }
1668
1669         if (dev->has_msp34xx) {
1670                 /* Send a reset to other chips via gpio */
1671                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1672                 msleep(3);
1673                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1674                 msleep(3);
1675
1676         }
1677         video_mux(dev, 0);
1678
1679         mutex_unlock(&dev->lock);
1680
1681         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1682                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1683                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1684
1685         return 0;
1686 }
1687
1688 /*
1689  * em28xx_usb_probe()
1690  * checks for supported devices
1691  */
1692 static int em28xx_usb_probe(struct usb_interface *interface,
1693                             const struct usb_device_id *id)
1694 {
1695         const struct usb_endpoint_descriptor *endpoint;
1696         struct usb_device *udev;
1697         struct usb_interface *uif;
1698         struct em28xx *dev = NULL;
1699         int retval = -ENODEV;
1700         int model,i,nr,ifnum;
1701
1702         udev = usb_get_dev(interface_to_usbdev(interface));
1703         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1704
1705         /* Check to see next free device and mark as used */
1706         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1707         em28xx_devused|=1<<nr;
1708
1709         /* Don't register audio interfaces */
1710         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1711                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1712                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1713                                 ifnum,
1714                                 interface->altsetting[0].desc.bInterfaceClass);
1715
1716                 em28xx_devused&=~(1<<nr);
1717                 return -ENODEV;
1718         }
1719
1720         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1721                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1722                         ifnum,
1723                         interface->altsetting[0].desc.bInterfaceClass);
1724
1725         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1726
1727         /* check if the device has the iso in endpoint at the correct place */
1728         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1729             USB_ENDPOINT_XFER_ISOC) {
1730                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1731                 em28xx_devused&=~(1<<nr);
1732                 return -ENODEV;
1733         }
1734         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1735                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1736                 em28xx_devused&=~(1<<nr);
1737                 return -ENODEV;
1738         }
1739
1740         model=id->driver_info;
1741
1742         if (nr >= EM28XX_MAXBOARDS) {
1743                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1744                 em28xx_devused&=~(1<<nr);
1745                 return -ENOMEM;
1746         }
1747
1748         /* allocate memory for our device state and initialize it */
1749         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1750         if (dev == NULL) {
1751                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1752                 em28xx_devused&=~(1<<nr);
1753                 return -ENOMEM;
1754         }
1755
1756         snprintf(dev->name, 29, "em28xx #%d", nr);
1757         dev->devno=nr;
1758
1759         /* compute alternate max packet sizes */
1760         uif = udev->actconfig->interface[0];
1761
1762         dev->num_alt=uif->num_altsetting;
1763         em28xx_info("Alternate settings: %i\n",dev->num_alt);
1764 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1765         dev->alt_max_pkt_size = kmalloc(32*
1766                                                 dev->num_alt,GFP_KERNEL);
1767         if (dev->alt_max_pkt_size == NULL) {
1768                 em28xx_errdev("out of memory!\n");
1769                 em28xx_devused&=~(1<<nr);
1770                 kfree(dev);
1771                 return -ENOMEM;
1772         }
1773
1774         for (i = 0; i < dev->num_alt ; i++) {
1775                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1776                                                         wMaxPacketSize);
1777                 dev->alt_max_pkt_size[i] =
1778                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1779                 em28xx_info("Alternate setting %i, max size= %i\n",i,
1780                                                         dev->alt_max_pkt_size[i]);
1781         }
1782
1783         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1784                 model=card[nr];
1785
1786         if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
1787                 em28xx_errdev( "Your board has no eeprom inside it and thus can't\n"
1788                         "%s: be autodetected.  Please pass card=<n> insmod option to\n"
1789                         "%s: workaround that.  Redirect complaints to the vendor of\n"
1790                         "%s: the TV card. Generic type will be used."
1791                         "%s: Best regards,\n"
1792                         "%s:         -- tux\n",
1793                         dev->name,dev->name,dev->name,dev->name,dev->name);
1794                 em28xx_errdev("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
1795                         dev->name);
1796                 for (i = 0; i < em28xx_bcount; i++) {
1797                         em28xx_errdev("    card=%d -> %s\n", i,
1798                                                         em28xx_boards[i].name);
1799                 }
1800         }
1801
1802         /* allocate device struct */
1803         retval = em28xx_init_dev(&dev, udev, nr, model);
1804         if (retval)
1805                 return retval;
1806
1807         em28xx_info("Found %s\n", em28xx_boards[model].name);
1808
1809         /* save our data pointer in this interface device */
1810         usb_set_intfdata(interface, dev);
1811         return 0;
1812 }
1813
1814 /*
1815  * em28xx_usb_disconnect()
1816  * called when the device gets diconencted
1817  * video device will be unregistered on v4l2_close in case it is still open
1818  */
1819 static void em28xx_usb_disconnect(struct usb_interface *interface)
1820 {
1821         struct em28xx *dev = usb_get_intfdata(interface);
1822         usb_set_intfdata(interface, NULL);
1823
1824         if (!dev)
1825                 return;
1826
1827         down_write(&em28xx_disconnect);
1828
1829         mutex_lock(&dev->lock);
1830
1831         em28xx_info("disconnecting %s\n", dev->vdev->name);
1832
1833         wake_up_interruptible_all(&dev->open);
1834
1835         if (dev->users) {
1836                 em28xx_warn
1837                     ("device /dev/video%d is open! Deregistration and memory "
1838                      "deallocation are deferred on close.\n",
1839                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1840
1841                 dev->state |= DEV_MISCONFIGURED;
1842                 em28xx_uninit_isoc(dev);
1843                 dev->state |= DEV_DISCONNECTED;
1844                 wake_up_interruptible(&dev->wait_frame);
1845                 wake_up_interruptible(&dev->wait_stream);
1846         } else {
1847                 dev->state |= DEV_DISCONNECTED;
1848                 em28xx_release_resources(dev);
1849         }
1850
1851         mutex_unlock(&dev->lock);
1852
1853         if (!dev->users) {
1854                 kfree(dev->alt_max_pkt_size);
1855                 kfree(dev);
1856         }
1857
1858         up_write(&em28xx_disconnect);
1859 }
1860
1861 static struct usb_driver em28xx_usb_driver = {
1862         .name = "em28xx",
1863         .probe = em28xx_usb_probe,
1864         .disconnect = em28xx_usb_disconnect,
1865         .id_table = em28xx_id_table,
1866 };
1867
1868 static int __init em28xx_module_init(void)
1869 {
1870         int result;
1871
1872         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1873                (EM28XX_VERSION_CODE >> 16) & 0xff,
1874                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1875 #ifdef SNAPSHOT
1876         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1877                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1878 #endif
1879
1880         /* register this driver with the USB subsystem */
1881         result = usb_register(&em28xx_usb_driver);
1882         if (result)
1883                 em28xx_err(DRIVER_NAME
1884                            " usb_register failed. Error number %d.\n", result);
1885
1886         return result;
1887 }
1888
1889 static void __exit em28xx_module_exit(void)
1890 {
1891         /* deregister this driver with the USB subsystem */
1892         usb_deregister(&em28xx_usb_driver);
1893 }
1894
1895 module_init(em28xx_module_init);
1896 module_exit(em28xx_module_exit);