git.oblomov.eu Git - linux-2.6/blob - 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         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/video_decoder.h>
  36 #include <linux/mutex.h>
  37
  38 #include "em28xx.h"
  39 #include <media/tuner.h>
  40 #include <media/v4l2-common.h>
  41 #include <media/msp3400.h>
  42
  43 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  44                       "Markus Rechberger <mrechberger@gmail.com>, " \
  45                       "Mauro Carvalho Chehab <mchehab@brturbo.com.br>, " \
  46                       "Sascha Sommer <saschasommer@freenet.de>"
  47
  48 #define DRIVER_NAME         "em28xx"
  49 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  50 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 0, 1)
  51
  52 #define em28xx_videodbg(fmt, arg...) do {\
  53         if (video_debug) \
  54                 printk(KERN_INFO "%s %s :"fmt, \
  55                          dev->name, __FUNCTION__ , ##arg); } while (0)
  56
  57 MODULE_AUTHOR(DRIVER_AUTHOR);
  58 MODULE_DESCRIPTION(DRIVER_DESC);
  59 MODULE_LICENSE("GPL");
  60
  61 static LIST_HEAD(em28xx_devlist);
  62
  63 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  64 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  65 static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  66 module_param_array(card,  int, NULL, 0444);
  67 module_param_array(video_nr, int, NULL, 0444);
  68 module_param_array(vbi_nr, int, NULL, 0444);
  69 MODULE_PARM_DESC(card,"card type");
  70 MODULE_PARM_DESC(video_nr,"video device numbers");
  71 MODULE_PARM_DESC(vbi_nr,"vbi device numbers");
  72
  73 static int tuner = -1;
  74 module_param(tuner, int, 0444);
  75 MODULE_PARM_DESC(tuner, "tuner type");
  76
  77 static unsigned int video_debug = 0;
  78 module_param(video_debug,int,0644);
  79 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  80
  81 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  82 static unsigned long em28xx_devused;
  83
  84 /* supported tv norms */
  85 static struct em28xx_tvnorm tvnorms[] = {
  86         {
  87                 .name = "PAL",
  88                 .id = V4L2_STD_PAL,
  89                 .mode = VIDEO_MODE_PAL,
  90          }, {
  91                 .name = "NTSC",
  92                 .id = V4L2_STD_NTSC,
  93                 .mode = VIDEO_MODE_NTSC,
  94         }, {
  95                  .name = "SECAM",
  96                  .id = V4L2_STD_SECAM,
  97                  .mode = VIDEO_MODE_SECAM,
  98         }, {
  99                 .name = "PAL-M",
 100                 .id = V4L2_STD_PAL_M,
 101                 .mode = VIDEO_MODE_PAL,
 102         }
 103 };
 104
 105 #define TVNORMS ARRAY_SIZE(tvnorms)
 106
 107 /* supported controls */
 108 /* Common to all boards */
 109 static struct v4l2_queryctrl em28xx_qctrl[] = {
 110         {
 111                 .id = V4L2_CID_AUDIO_VOLUME,
 112                 .type = V4L2_CTRL_TYPE_INTEGER,
 113                 .name = "Volume",
 114                 .minimum = 0x0,
 115                 .maximum = 0x1f,
 116                 .step = 0x1,
 117                 .default_value = 0x1f,
 118                 .flags = 0,
 119         },{
 120                 .id = V4L2_CID_AUDIO_MUTE,
 121                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 122                 .name = "Mute",
 123                 .minimum = 0,
 124                 .maximum = 1,
 125                 .step = 1,
 126                 .default_value = 1,
 127                 .flags = 0,
 128         }
 129 };
 130
 131 static struct usb_driver em28xx_usb_driver;
 132
 133 static DEFINE_MUTEX(em28xx_sysfs_lock);
 134 static DECLARE_RWSEM(em28xx_disconnect);
 135
 136 /*********************  v4l2 interface  ******************************************/
 137
 138 /*
 139  * em28xx_config()
 140  * inits registers with sane defaults
 141  */
 142 static int em28xx_config(struct em28xx *dev)
 143 {
 144
 145         /* Sets I2C speed to 100 KHz */
 146         em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 147
 148         /* enable vbi capturing */
 149
 150 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 151 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 152         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 153
 154         em28xx_audio_usb_mute(dev, 1);
 155         dev->mute = 1;          /* maybe not the right place... */
 156         dev->volume = 0x1f;
 157         em28xx_audio_analog_set(dev);
 158         em28xx_audio_analog_setup(dev);
 159         em28xx_outfmt_set_yuv422(dev);
 160         em28xx_colorlevels_set_default(dev);
 161         em28xx_compression_disable(dev);
 162
 163         return 0;
 164 }
 165
 166 /*
 167  * em28xx_config_i2c()
 168  * configure i2c attached devices
 169  */
 170 static void em28xx_config_i2c(struct em28xx *dev)
 171 {
 172         struct v4l2_frequency f;
 173         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 174         em28xx_i2c_call_clients(dev, VIDIOC_S_INPUT, &dev->ctl_input);
 175         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 176
 177         /* configure tuner */
 178         f.tuner = 0;
 179         f.type = V4L2_TUNER_ANALOG_TV;
 180         f.frequency = 9076;     /* FIXME:remove magic number */
 181         dev->ctl_freq = f.frequency;
 182         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 183
 184         /* configure tda9887 */
 185
 186
 187 /*      em28xx_i2c_call_clients(dev,VIDIOC_S_STD,&dev->tvnorm->id); */
 188 }
 189
 190 /*
 191  * em28xx_empty_framequeues()
 192  * prepare queues for incoming and outgoing frames
 193  */
 194 static void em28xx_empty_framequeues(struct em28xx *dev)
 195 {
 196         u32 i;
 197
 198         INIT_LIST_HEAD(&dev->inqueue);
 199         INIT_LIST_HEAD(&dev->outqueue);
 200
 201         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 202                 dev->frame[i].state = F_UNUSED;
 203                 dev->frame[i].buf.bytesused = 0;
 204         }
 205 }
 206
 207 static void video_mux(struct em28xx *dev, int index)
 208 {
 209         int input, ainput;
 210
 211         input = INPUT(index)->vmux;
 212         dev->ctl_input = index;
 213         dev->ctl_ainput = INPUT(index)->amux;
 214
 215         em28xx_i2c_call_clients(dev, VIDIOC_S_INPUT, &input);
 216
 217         em28xx_videodbg("Setting input index=%d, vmux=%d, amux=%d\n",index,input,dev->ctl_ainput);
 218
 219         if (dev->has_msp34xx) {
 220                 struct v4l2_routing route;
 221
 222                 if (dev->i2s_speed)
 223                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 224                 route.input = dev->ctl_ainput;
 225                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 226                 /* Note: this is msp3400 specific */
 227                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 228                 ainput = EM28XX_AUDIO_SRC_TUNER;
 229                 em28xx_audio_source(dev, ainput);
 230         } else {
 231                 switch (dev->ctl_ainput) {
 232                         case 0:
 233                                 ainput = EM28XX_AUDIO_SRC_TUNER;
 234                                 break;
 235                         default:
 236                                 ainput = EM28XX_AUDIO_SRC_LINE;
 237                 }
 238                 em28xx_audio_source(dev, ainput);
 239         }
 240 }
 241
 242 /*
 243  * em28xx_v4l2_open()
 244  * inits the device and starts isoc transfer
 245  */
 246 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
 247 {
 248         int minor = iminor(inode);
 249         int errCode = 0;
 250         struct em28xx *h,*dev = NULL;
 251         struct list_head *list;
 252
 253         list_for_each(list,&em28xx_devlist) {
 254                 h = list_entry(list, struct em28xx, devlist);
 255                 if (h->vdev->minor == minor) {
 256                         dev  = h;
 257                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 258                 }
 259                 if (h->vbi_dev->minor == minor) {
 260                         dev  = h;
 261                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 262                 }
 263         }
 264         if (NULL == dev)
 265                 return -ENODEV;
 266
 267         filp->private_data=dev;
 268
 269         em28xx_videodbg("open minor=%d type=%s users=%d\n",
 270                                 minor,v4l2_type_names[dev->type],dev->users);
 271
 272         if (!down_read_trylock(&em28xx_disconnect))
 273                 return -ERESTARTSYS;
 274
 275         if (dev->users) {
 276                 em28xx_warn("this driver can be opened only once\n");
 277                 up_read(&em28xx_disconnect);
 278                 return -EBUSY;
 279         }
 280
 281         mutex_init(&dev->fileop_lock);  /* to 1 == available */
 282         spin_lock_init(&dev->queue_lock);
 283         init_waitqueue_head(&dev->wait_frame);
 284         init_waitqueue_head(&dev->wait_stream);
 285
 286         mutex_lock(&dev->lock);
 287
 288         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 289                 em28xx_set_alternate(dev);
 290
 291                 dev->width = norm_maxw(dev);
 292                 dev->height = norm_maxh(dev);
 293                 dev->frame_size = dev->width * dev->height * 2;
 294                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 295                 dev->bytesperline = dev->width * 2;
 296                 dev->hscale = 0;
 297                 dev->vscale = 0;
 298
 299                 em28xx_capture_start(dev, 1);
 300                 em28xx_resolution_set(dev);
 301
 302                 /* device needs to be initialized before isoc transfer */
 303                 video_mux(dev, 0);
 304
 305                 /* start the transfer */
 306                 errCode = em28xx_init_isoc(dev);
 307                 if (errCode)
 308                         goto err;
 309
 310         }
 311
 312         dev->users++;
 313         filp->private_data = dev;
 314         dev->io = IO_NONE;
 315         dev->stream = STREAM_OFF;
 316         dev->num_frames = 0;
 317
 318         /* prepare queues */
 319         em28xx_empty_framequeues(dev);
 320
 321         dev->state |= DEV_INITIALIZED;
 322
 323 err:
 324         mutex_unlock(&dev->lock);
 325         up_read(&em28xx_disconnect);
 326         return errCode;
 327 }
 328
 329 /*
 330  * em28xx_realease_resources()
 331  * unregisters the v4l2,i2c and usb devices
 332  * called when the device gets disconected or at module unload
 333 */
 334 static void em28xx_release_resources(struct em28xx *dev)
 335 {
 336         mutex_lock(&em28xx_sysfs_lock);
 337
 338         /*FIXME: I2C IR should be disconnected */
 339
 340         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
 341                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
 342                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
 343         list_del(&dev->devlist);
 344         video_unregister_device(dev->vdev);
 345         video_unregister_device(dev->vbi_dev);
 346         em28xx_i2c_unregister(dev);
 347         usb_put_dev(dev->udev);
 348         mutex_unlock(&em28xx_sysfs_lock);
 349
 350
 351         /* Mark device as unused */
 352         em28xx_devused&=~(1<<dev->devno);
 353 }
 354
 355 /*
 356  * em28xx_v4l2_close()
 357  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
 358  */
 359 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 360 {
 361         int errCode;
 362         struct em28xx *dev=filp->private_data;
 363
 364         em28xx_videodbg("users=%d\n", dev->users);
 365
 366         mutex_lock(&dev->lock);
 367
 368         em28xx_uninit_isoc(dev);
 369
 370         em28xx_release_buffers(dev);
 371
 372         /* the device is already disconnect, free the remaining resources */
 373         if (dev->state & DEV_DISCONNECTED) {
 374                 em28xx_release_resources(dev);
 375                 mutex_unlock(&dev->lock);
 376                 kfree(dev);
 377                 return 0;
 378         }
 379
 380         /* set alternate 0 */
 381         dev->alt = 0;
 382         em28xx_videodbg("setting alternate 0\n");
 383         errCode = usb_set_interface(dev->udev, 0, 0);
 384         if (errCode < 0) {
 385                 em28xx_errdev ("cannot change alternate number to 0 (error=%i)\n",
 386                      errCode);
 387         }
 388
 389         dev->users--;
 390         wake_up_interruptible_nr(&dev->open, 1);
 391         mutex_unlock(&dev->lock);
 392         return 0;
 393 }
 394
 395 /*
 396  * em28xx_v4l2_read()
 397  * will allocate buffers when called for the first time
 398  */
 399 static ssize_t
 400 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
 401                  loff_t * f_pos)
 402 {
 403         struct em28xx_frame_t *f, *i;
 404         unsigned long lock_flags;
 405         int ret = 0;
 406         struct em28xx *dev = filp->private_data;
 407
 408         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 409                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
 410         }
 411         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 412                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
 413                 em28xx_videodbg("not supported yet! ...\n");
 414                 if (copy_to_user(buf, "", 1)) {
 415                         mutex_unlock(&dev->fileop_lock);
 416                         return -EFAULT;
 417                 }
 418                 return (1);
 419         }
 420         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 421                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
 422                 em28xx_videodbg("not supported yet! ...\n");
 423                 if (copy_to_user(buf, "", 1)) {
 424                         mutex_unlock(&dev->fileop_lock);
 425                         return -EFAULT;
 426                 }
 427                 return (1);
 428         }
 429
 430         if (mutex_lock_interruptible(&dev->fileop_lock))
 431                 return -ERESTARTSYS;
 432
 433         if (dev->state & DEV_DISCONNECTED) {
 434                 em28xx_videodbg("device not present\n");
 435                 mutex_unlock(&dev->fileop_lock);
 436                 return -ENODEV;
 437         }
 438
 439         if (dev->state & DEV_MISCONFIGURED) {
 440                 em28xx_videodbg("device misconfigured; close and open it again\n");
 441                 mutex_unlock(&dev->fileop_lock);
 442                 return -EIO;
 443         }
 444
 445         if (dev->io == IO_MMAP) {
 446                 em28xx_videodbg ("IO method is set to mmap; close and open"
 447                                 " the device again to choose the read method\n");
 448                 mutex_unlock(&dev->fileop_lock);
 449                 return -EINVAL;
 450         }
 451
 452         if (dev->io == IO_NONE) {
 453                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
 454                         em28xx_errdev("read failed, not enough memory\n");
 455                         mutex_unlock(&dev->fileop_lock);
 456                         return -ENOMEM;
 457                 }
 458                 dev->io = IO_READ;
 459                 dev->stream = STREAM_ON;
 460                 em28xx_queue_unusedframes(dev);
 461         }
 462
 463         if (!count) {
 464                 mutex_unlock(&dev->fileop_lock);
 465                 return 0;
 466         }
 467
 468         if (list_empty(&dev->outqueue)) {
 469                 if (filp->f_flags & O_NONBLOCK) {
 470                         mutex_unlock(&dev->fileop_lock);
 471                         return -EAGAIN;
 472                 }
 473                 ret = wait_event_interruptible
 474                     (dev->wait_frame,
 475                      (!list_empty(&dev->outqueue)) ||
 476                      (dev->state & DEV_DISCONNECTED));
 477                 if (ret) {
 478                         mutex_unlock(&dev->fileop_lock);
 479                         return ret;
 480                 }
 481                 if (dev->state & DEV_DISCONNECTED) {
 482                         mutex_unlock(&dev->fileop_lock);
 483                         return -ENODEV;
 484                 }
 485         }
 486
 487         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
 488
 489         spin_lock_irqsave(&dev->queue_lock, lock_flags);
 490         list_for_each_entry(i, &dev->outqueue, frame)
 491             i->state = F_UNUSED;
 492         INIT_LIST_HEAD(&dev->outqueue);
 493         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
 494
 495         em28xx_queue_unusedframes(dev);
 496
 497         if (count > f->buf.length)
 498                 count = f->buf.length;
 499
 500         if (copy_to_user(buf, f->bufmem, count)) {
 501                 mutex_unlock(&dev->fileop_lock);
 502                 return -EFAULT;
 503         }
 504         *f_pos += count;
 505
 506         mutex_unlock(&dev->fileop_lock);
 507
 508         return count;
 509 }
 510
 511 /*
 512  * em28xx_v4l2_poll()
 513  * will allocate buffers when called for the first time
 514  */
 515 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
 516 {
 517         unsigned int mask = 0;
 518         struct em28xx *dev = filp->private_data;
 519
 520         if (mutex_lock_interruptible(&dev->fileop_lock))
 521                 return POLLERR;
 522
 523         if (dev->state & DEV_DISCONNECTED) {
 524                 em28xx_videodbg("device not present\n");
 525         } else if (dev->state & DEV_MISCONFIGURED) {
 526                 em28xx_videodbg("device is misconfigured; close and open it again\n");
 527         } else {
 528                 if (dev->io == IO_NONE) {
 529                         if (!em28xx_request_buffers
 530                             (dev, EM28XX_NUM_READ_FRAMES)) {
 531                                 em28xx_warn
 532                                     ("poll() failed, not enough memory\n");
 533                         } else {
 534                                 dev->io = IO_READ;
 535                                 dev->stream = STREAM_ON;
 536                         }
 537                 }
 538
 539                 if (dev->io == IO_READ) {
 540                         em28xx_queue_unusedframes(dev);
 541                         poll_wait(filp, &dev->wait_frame, wait);
 542
 543                         if (!list_empty(&dev->outqueue))
 544                                 mask |= POLLIN | POLLRDNORM;
 545
 546                         mutex_unlock(&dev->fileop_lock);
 547
 548                         return mask;
 549                 }
 550         }
 551
 552         mutex_unlock(&dev->fileop_lock);
 553         return POLLERR;
 554 }
 555
 556 /*
 557  * em28xx_vm_open()
 558  */
 559 static void em28xx_vm_open(struct vm_area_struct *vma)
 560 {
 561         struct em28xx_frame_t *f = vma->vm_private_data;
 562         f->vma_use_count++;
 563 }
 564
 565 /*
 566  * em28xx_vm_close()
 567  */
 568 static void em28xx_vm_close(struct vm_area_struct *vma)
 569 {
 570         /* NOTE: buffers are not freed here */
 571         struct em28xx_frame_t *f = vma->vm_private_data;
 572         f->vma_use_count--;
 573 }
 574
 575 static struct vm_operations_struct em28xx_vm_ops = {
 576         .open = em28xx_vm_open,
 577         .close = em28xx_vm_close,
 578 };
 579
 580 /*
 581  * em28xx_v4l2_mmap()
 582  */
 583 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
 584 {
 585         unsigned long size = vma->vm_end - vma->vm_start,
 586             start = vma->vm_start;
 587         void *pos;
 588         u32 i;
 589
 590         struct em28xx *dev = filp->private_data;
 591
 592         if (mutex_lock_interruptible(&dev->fileop_lock))
 593                 return -ERESTARTSYS;
 594
 595         if (dev->state & DEV_DISCONNECTED) {
 596                 em28xx_videodbg("mmap: device not present\n");
 597                 mutex_unlock(&dev->fileop_lock);
 598                 return -ENODEV;
 599         }
 600
 601         if (dev->state & DEV_MISCONFIGURED) {
 602                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
 603                                                 "open it again\n");
 604                 mutex_unlock(&dev->fileop_lock);
 605                 return -EIO;
 606         }
 607
 608         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
 609             size != PAGE_ALIGN(dev->frame[0].buf.length)) {
 610                 mutex_unlock(&dev->fileop_lock);
 611                 return -EINVAL;
 612         }
 613
 614         for (i = 0; i < dev->num_frames; i++) {
 615                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
 616                         break;
 617         }
 618         if (i == dev->num_frames) {
 619                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
 620                 mutex_unlock(&dev->fileop_lock);
 621                 return -EINVAL;
 622         }
 623
 624         /* VM_IO is eventually going to replace PageReserved altogether */
 625         vma->vm_flags |= VM_IO;
 626         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
 627
 628         pos = dev->frame[i].bufmem;
 629         while (size > 0) {      /* size is page-aligned */
 630                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
 631                         em28xx_videodbg("mmap: vm_insert_page failed\n");
 632                         mutex_unlock(&dev->fileop_lock);
 633                         return -EAGAIN;
 634                 }
 635                 start += PAGE_SIZE;
 636                 pos += PAGE_SIZE;
 637                 size -= PAGE_SIZE;
 638         }
 639
 640         vma->vm_ops = &em28xx_vm_ops;
 641         vma->vm_private_data = &dev->frame[i];
 642
 643         em28xx_vm_open(vma);
 644         mutex_unlock(&dev->fileop_lock);
 645         return 0;
 646 }
 647
 648 /*
 649  * em28xx_get_ctrl()
 650  * return the current saturation, brightness or contrast, mute state
 651  */
 652 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 653 {
 654         switch (ctrl->id) {
 655         case V4L2_CID_AUDIO_MUTE:
 656                 ctrl->value = dev->mute;
 657                 return 0;
 658         case V4L2_CID_AUDIO_VOLUME:
 659                 ctrl->value = dev->volume;
 660                 return 0;
 661         default:
 662                 return -EINVAL;
 663         }
 664 }
 665
 666 /*
 667  * em28xx_set_ctrl()
 668  * mute or set new saturation, brightness or contrast
 669  */
 670 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 671 {
 672         switch (ctrl->id) {
 673         case V4L2_CID_AUDIO_MUTE:
 674                 if (ctrl->value != dev->mute) {
 675                         dev->mute = ctrl->value;
 676                         em28xx_audio_usb_mute(dev, ctrl->value);
 677                         return em28xx_audio_analog_set(dev);
 678                 }
 679                 return 0;
 680         case V4L2_CID_AUDIO_VOLUME:
 681                 dev->volume = ctrl->value;
 682                 return em28xx_audio_analog_set(dev);
 683         default:
 684                 return -EINVAL;
 685         }
 686 }
 687
 688 /*
 689  * em28xx_stream_interrupt()
 690  * stops streaming
 691  */
 692 static int em28xx_stream_interrupt(struct em28xx *dev)
 693 {
 694         int ret = 0;
 695
 696         /* stop reading from the device */
 697
 698         dev->stream = STREAM_INTERRUPT;
 699         ret = wait_event_timeout(dev->wait_stream,
 700                                  (dev->stream == STREAM_OFF) ||
 701                                  (dev->state & DEV_DISCONNECTED),
 702                                  EM28XX_URB_TIMEOUT);
 703         if (dev->state & DEV_DISCONNECTED)
 704                 return -ENODEV;
 705         else if (ret) {
 706                 dev->state |= DEV_MISCONFIGURED;
 707                 em28xx_videodbg("device is misconfigured; close and "
 708                         "open /dev/video%d again\n",
 709                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 710                 return ret;
 711         }
 712
 713         return 0;
 714 }
 715
 716 static int em28xx_set_norm(struct em28xx *dev, int width, int height)
 717 {
 718         unsigned int hscale, vscale;
 719         unsigned int maxh, maxw;
 720
 721         maxw = norm_maxw(dev);
 722         maxh = norm_maxh(dev);
 723
 724         /* width must even because of the YUYV format */
 725         /* height must be even because of interlacing */
 726         height &= 0xfffe;
 727         width &= 0xfffe;
 728
 729         if (height < 32)
 730                 height = 32;
 731         if (height > maxh)
 732                 height = maxh;
 733         if (width < 48)
 734                 width = 48;
 735         if (width > maxw)
 736                 width = maxw;
 737
 738         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 739                 hscale = 0x3fff;
 740         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 741
 742         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 743                 vscale = 0x3fff;
 744         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 745
 746         /* set new image size */
 747         dev->width = width;
 748         dev->height = height;
 749         dev->frame_size = dev->width * dev->height * 2;
 750         dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
 751         dev->bytesperline = dev->width * 2;
 752         dev->hscale = hscale;
 753         dev->vscale = vscale;
 754
 755         em28xx_resolution_set(dev);
 756
 757         return 0;
 758 }
 759
 760 static int em28xx_get_fmt(struct em28xx *dev, struct v4l2_format *format)
 761 {
 762         em28xx_videodbg("VIDIOC_G_FMT: type=%s\n",
 763                 (format->type ==V4L2_BUF_TYPE_VIDEO_CAPTURE) ?
 764                 "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 765                 (format->type ==V4L2_BUF_TYPE_VBI_CAPTURE) ?
 766                 "V4L2_BUF_TYPE_VBI_CAPTURE" :
 767                 (format->type ==V4L2_CAP_SLICED_VBI_CAPTURE) ?
 768                 "V4L2_BUF_TYPE_SLICED_VBI_CAPTURE " :
 769                 "not supported");
 770
 771         switch (format->type) {
 772         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 773         {
 774                 format->fmt.pix.width = dev->width;
 775                 format->fmt.pix.height = dev->height;
 776                 format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 777                 format->fmt.pix.bytesperline = dev->bytesperline;
 778                 format->fmt.pix.sizeimage = dev->frame_size;
 779                 format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 780                 format->fmt.pix.field = dev->interlaced ? V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;       /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 781
 782                 em28xx_videodbg("VIDIOC_G_FMT: %dx%d\n", dev->width,
 783                         dev->height);
 784                 break;
 785         }
 786
 787         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 788         {
 789                 format->fmt.sliced.service_set=0;
 790
 791                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 792
 793                 if (format->fmt.sliced.service_set==0)
 794                         return -EINVAL;
 795
 796                 break;
 797         }
 798
 799         default:
 800                 return -EINVAL;
 801         }
 802         return (0);
 803 }
 804
 805 static int em28xx_set_fmt(struct em28xx *dev, unsigned int cmd, struct v4l2_format *format)
 806 {
 807         u32 i;
 808         int ret = 0;
 809         int width = format->fmt.pix.width;
 810         int height = format->fmt.pix.height;
 811         unsigned int hscale, vscale;
 812         unsigned int maxh, maxw;
 813
 814         maxw = norm_maxw(dev);
 815         maxh = norm_maxh(dev);
 816
 817         em28xx_videodbg("%s: type=%s\n",
 818                         cmd == VIDIOC_TRY_FMT ?
 819                         "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 820                         format->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ?
 821                         "V4L2_BUF_TYPE_VIDEO_CAPTURE" :
 822                         format->type == V4L2_BUF_TYPE_VBI_CAPTURE ?
 823                         "V4L2_BUF_TYPE_VBI_CAPTURE " :
 824                         "not supported");
 825
 826         if (format->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
 827                 em28xx_i2c_call_clients(dev,VIDIOC_G_FMT,format);
 828
 829                 if (format->fmt.sliced.service_set==0)
 830                         return -EINVAL;
 831
 832                 return 0;
 833         }
 834
 835
 836         if (format->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 837                 return -EINVAL;
 838
 839         em28xx_videodbg("%s: requested %dx%d\n",
 840                 cmd == VIDIOC_TRY_FMT ?
 841                 "VIDIOC_TRY_FMT" : "VIDIOC_S_FMT",
 842                 format->fmt.pix.width, format->fmt.pix.height);
 843
 844         /* FIXME: Move some code away from here */
 845         /* width must even because of the YUYV format */
 846         /* height must be even because of interlacing */
 847         height &= 0xfffe;
 848         width &= 0xfffe;
 849
 850         if (height < 32)
 851                 height = 32;
 852         if (height > maxh)
 853                 height = maxh;
 854         if (width < 48)
 855                 width = 48;
 856         if (width > maxw)
 857                 width = maxw;
 858
 859         if(dev->is_em2800){
 860                 /* the em2800 can only scale down to 50% */
 861                 if(height % (maxh / 2))
 862                         height=maxh;
 863                 if(width % (maxw / 2))
 864                         width=maxw;
 865                 /* according to empiatech support */
 866                 /* the MaxPacketSize is to small to support */
 867                 /* framesizes larger than 640x480 @ 30 fps */
 868                 /* or 640x576 @ 25 fps. As this would cut */
 869                 /* of a part of the image we prefer */
 870                 /* 360x576 or 360x480 for now */
 871                 if(width == maxw && height == maxh)
 872                         width /= 2;
 873         }
 874
 875         if ((hscale = (((unsigned long)maxw) << 12) / width - 4096L) >= 0x4000)
 876                 hscale = 0x3fff;
 877
 878         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 879
 880         if ((vscale = (((unsigned long)maxh) << 12) / height - 4096L) >= 0x4000)
 881                 vscale = 0x3fff;
 882
 883         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 884
 885         format->fmt.pix.width = width;
 886         format->fmt.pix.height = height;
 887         format->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 888         format->fmt.pix.bytesperline = width * 2;
 889         format->fmt.pix.sizeimage = width * 2 * height;
 890         format->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 891         format->fmt.pix.field = V4L2_FIELD_INTERLACED;
 892
 893         em28xx_videodbg("%s: returned %dx%d (%d, %d)\n",
 894                 cmd == VIDIOC_TRY_FMT ?
 895                 "VIDIOC_TRY_FMT" :"VIDIOC_S_FMT",
 896                 format->fmt.pix.width, format->fmt.pix.height, hscale, vscale);
 897
 898         if (cmd == VIDIOC_TRY_FMT)
 899                 return 0;
 900
 901         for (i = 0; i < dev->num_frames; i++)
 902                 if (dev->frame[i].vma_use_count) {
 903                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 904                                 "Unmap the buffers first.\n");
 905                         return -EINVAL;
 906                 }
 907
 908         /* stop io in case it is already in progress */
 909         if (dev->stream == STREAM_ON) {
 910                 em28xx_videodbg("VIDIOC_SET_FMT: interupting stream\n");
 911                 if ((ret = em28xx_stream_interrupt(dev)))
 912                         return ret;
 913         }
 914
 915         em28xx_release_buffers(dev);
 916         dev->io = IO_NONE;
 917
 918         /* set new image size */
 919         dev->width = width;
 920         dev->height = height;
 921         dev->frame_size = dev->width * dev->height * 2;
 922         dev->field_size = dev->frame_size >> 1;
 923         dev->bytesperline = dev->width * 2;
 924         dev->hscale = hscale;
 925         dev->vscale = vscale;
 926         em28xx_uninit_isoc(dev);
 927         em28xx_set_alternate(dev);
 928         em28xx_capture_start(dev, 1);
 929         em28xx_resolution_set(dev);
 930         em28xx_init_isoc(dev);
 931
 932         return 0;
 933 }
 934
 935 /*
 936  * em28xx_v4l2_do_ioctl()
 937  * This function is _not_ called directly, but from
 938  * em28xx_v4l2_ioctl. Userspace
 939  * copying is done already, arg is a kernel pointer.
 940  */
 941 static int em28xx_do_ioctl(struct inode *inode, struct file *filp,
 942                            struct em28xx *dev, unsigned int cmd, void *arg,
 943                            v4l2_kioctl driver_ioctl)
 944 {
 945         int ret;
 946
 947         switch (cmd) {
 948                 /* ---------- tv norms ---------- */
 949         case VIDIOC_ENUMSTD:
 950         {
 951                 struct v4l2_standard *e = arg;
 952                 unsigned int i;
 953
 954                 i = e->index;
 955                 if (i >= TVNORMS)
 956                         return -EINVAL;
 957                 ret = v4l2_video_std_construct(e, tvnorms[e->index].id,
 958                                                 tvnorms[e->index].name);
 959                 e->index = i;
 960                 if (ret < 0)
 961                         return ret;
 962                 return 0;
 963         }
 964         case VIDIOC_G_STD:
 965         {
 966                 v4l2_std_id *id = arg;
 967
 968                 *id = dev->tvnorm->id;
 969                 return 0;
 970         }
 971         case VIDIOC_S_STD:
 972         {
 973                 v4l2_std_id *id = arg;
 974                 unsigned int i;
 975
 976                 for (i = 0; i < TVNORMS; i++)
 977                         if (*id == tvnorms[i].id)
 978                                 break;
 979                 if (i == TVNORMS)
 980                         for (i = 0; i < TVNORMS; i++)
 981                                 if (*id & tvnorms[i].id)
 982                                         break;
 983                 if (i == TVNORMS)
 984                         return -EINVAL;
 985
 986                 mutex_lock(&dev->lock);
 987                 dev->tvnorm = &tvnorms[i];
 988
 989                 em28xx_set_norm(dev, dev->width, dev->height);
 990
 991                 em28xx_i2c_call_clients(dev, VIDIOC_S_STD,
 992                                         &dev->tvnorm->id);
 993
 994                 mutex_unlock(&dev->lock);
 995
 996                 return 0;
 997         }
 998
 999         /* ------ input switching ---------- */
1000         case VIDIOC_ENUMINPUT:
1001         {
1002                 struct v4l2_input *i = arg;
1003                 unsigned int n;
1004                 static const char *iname[] = {
1005                         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
1006                         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
1007                         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
1008                         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
1009                         [EM28XX_VMUX_SVIDEO] = "S-Video",
1010                         [EM28XX_VMUX_TELEVISION] = "Television",
1011                         [EM28XX_VMUX_CABLE] = "Cable TV",
1012                         [EM28XX_VMUX_DVB] = "DVB",
1013                         [EM28XX_VMUX_DEBUG] = "for debug only",
1014                 };
1015
1016                 n = i->index;
1017                 if (n >= MAX_EM28XX_INPUT)
1018                         return -EINVAL;
1019                 if (0 == INPUT(n)->type)
1020                         return -EINVAL;
1021                 memset(i, 0, sizeof(*i));
1022                 i->index = n;
1023                 i->type = V4L2_INPUT_TYPE_CAMERA;
1024                 strcpy(i->name, iname[INPUT(n)->type]);
1025                 if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
1026                         (EM28XX_VMUX_CABLE == INPUT(n)->type))
1027                         i->type = V4L2_INPUT_TYPE_TUNER;
1028                 for (n = 0; n < ARRAY_SIZE(tvnorms); n++)
1029                         i->std |= tvnorms[n].id;
1030                 return 0;
1031         }
1032         case VIDIOC_G_INPUT:
1033         {
1034                 int *i = arg;
1035                 *i = dev->ctl_input;
1036
1037                 return 0;
1038         }
1039         case VIDIOC_S_INPUT:
1040         {
1041                 int *index = arg;
1042
1043                 if (*index >= MAX_EM28XX_INPUT)
1044                         return -EINVAL;
1045                 if (0 == INPUT(*index)->type)
1046                         return -EINVAL;
1047
1048                 mutex_lock(&dev->lock);
1049                 video_mux(dev, *index);
1050                 mutex_unlock(&dev->lock);
1051
1052                 return 0;
1053         }
1054         case VIDIOC_G_AUDIO:
1055         {
1056                 struct v4l2_audio *a = arg;
1057                 unsigned int index = a->index;
1058
1059                 if (a->index > 1)
1060                         return -EINVAL;
1061                 memset(a, 0, sizeof(*a));
1062                 index = dev->ctl_ainput;
1063
1064                 if (index == 0) {
1065                         strcpy(a->name, "Television");
1066                 } else {
1067                         strcpy(a->name, "Line In");
1068                 }
1069                 a->capability = V4L2_AUDCAP_STEREO;
1070                 a->index = index;
1071                 return 0;
1072         }
1073         case VIDIOC_S_AUDIO:
1074         {
1075                 struct v4l2_audio *a = arg;
1076
1077                 if (a->index != dev->ctl_ainput)
1078                         return -EINVAL;
1079
1080                 return 0;
1081         }
1082
1083         /* --- controls ---------------------------------------------- */
1084         case VIDIOC_QUERYCTRL:
1085         {
1086                 struct v4l2_queryctrl *qc = arg;
1087                 int i, id=qc->id;
1088
1089                 memset(qc,0,sizeof(*qc));
1090                 qc->id=id;
1091
1092                 if (!dev->has_msp34xx) {
1093                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1094                                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1095                                         memcpy(qc, &(em28xx_qctrl[i]),
1096                                         sizeof(*qc));
1097                                         return 0;
1098                                 }
1099                         }
1100                 }
1101                 em28xx_i2c_call_clients(dev,cmd,qc);
1102                 if (qc->type)
1103                         return 0;
1104                 else
1105                         return -EINVAL;
1106         }
1107         case VIDIOC_G_CTRL:
1108         {
1109                 struct v4l2_control *ctrl = arg;
1110                 int retval=-EINVAL;
1111
1112                 if (!dev->has_msp34xx)
1113                         retval=em28xx_get_ctrl(dev, ctrl);
1114                 if (retval==-EINVAL) {
1115                         em28xx_i2c_call_clients(dev,cmd,arg);
1116                         return 0;
1117                 } else return retval;
1118         }
1119         case VIDIOC_S_CTRL:
1120         {
1121                 struct v4l2_control *ctrl = arg;
1122                 u8 i;
1123
1124                 if (!dev->has_msp34xx){
1125                         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1126                                 if (ctrl->id == em28xx_qctrl[i].id) {
1127                                         if (ctrl->value <
1128                                         em28xx_qctrl[i].minimum
1129                                         || ctrl->value >
1130                                         em28xx_qctrl[i].maximum)
1131                                                 return -ERANGE;
1132                                         return em28xx_set_ctrl(dev, ctrl);
1133                                 }
1134                         }
1135                 }
1136
1137                 em28xx_i2c_call_clients(dev,cmd,arg);
1138                 return 0;
1139         }
1140         /* --- tuner ioctls ------------------------------------------ */
1141         case VIDIOC_G_TUNER:
1142         {
1143                 struct v4l2_tuner *t = arg;
1144
1145                 if (0 != t->index)
1146                         return -EINVAL;
1147
1148                 memset(t, 0, sizeof(*t));
1149                 strcpy(t->name, "Tuner");
1150                 mutex_lock(&dev->lock);
1151                 /* let clients fill in the remainder of this struct */
1152                 em28xx_i2c_call_clients(dev, cmd, t);
1153                 mutex_unlock(&dev->lock);
1154                 em28xx_videodbg("VIDIO_G_TUNER: signal=%x, afc=%x\n", t->signal,
1155                                 t->afc);
1156                 return 0;
1157         }
1158         case VIDIOC_S_TUNER:
1159         {
1160                 struct v4l2_tuner *t = arg;
1161
1162                 if (0 != t->index)
1163                         return -EINVAL;
1164                 mutex_lock(&dev->lock);
1165                 /* let clients handle this */
1166                 em28xx_i2c_call_clients(dev, cmd, t);
1167                 mutex_unlock(&dev->lock);
1168                 return 0;
1169         }
1170         case VIDIOC_G_FREQUENCY:
1171         {
1172                 struct v4l2_frequency *f = arg;
1173
1174                 memset(f, 0, sizeof(*f));
1175                 f->type = V4L2_TUNER_ANALOG_TV;
1176                 f->frequency = dev->ctl_freq;
1177
1178                 return 0;
1179         }
1180         case VIDIOC_S_FREQUENCY:
1181         {
1182                 struct v4l2_frequency *f = arg;
1183
1184                 if (0 != f->tuner)
1185                         return -EINVAL;
1186
1187                 if (V4L2_TUNER_ANALOG_TV != f->type)
1188                         return -EINVAL;
1189
1190                 mutex_lock(&dev->lock);
1191                 dev->ctl_freq = f->frequency;
1192                 em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1193                 mutex_unlock(&dev->lock);
1194                 return 0;
1195         }
1196         case VIDIOC_CROPCAP:
1197         {
1198                 struct v4l2_cropcap *cc = arg;
1199
1200                 if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1201                         return -EINVAL;
1202                 cc->bounds.left = 0;
1203                 cc->bounds.top = 0;
1204                 cc->bounds.width = dev->width;
1205                 cc->bounds.height = dev->height;
1206                 cc->defrect = cc->bounds;
1207                 cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1208                 cc->pixelaspect.denominator = 59;
1209                 return 0;
1210         }
1211         case VIDIOC_STREAMON:
1212         {
1213                 int *type = arg;
1214
1215                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1216                         || dev->io != IO_MMAP)
1217                         return -EINVAL;
1218
1219                 if (list_empty(&dev->inqueue))
1220                         return -EINVAL;
1221
1222                 dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
1223
1224                 em28xx_videodbg("VIDIOC_STREAMON: starting stream\n");
1225
1226                 return 0;
1227         }
1228         case VIDIOC_STREAMOFF:
1229         {
1230                 int *type = arg;
1231                 int ret;
1232
1233                 if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1234                         || dev->io != IO_MMAP)
1235                         return -EINVAL;
1236
1237                 if (dev->stream == STREAM_ON) {
1238                         em28xx_videodbg ("VIDIOC_STREAMOFF: interrupting stream\n");
1239                         if ((ret = em28xx_stream_interrupt(dev)))
1240                                 return ret;
1241                 }
1242                 em28xx_empty_framequeues(dev);
1243
1244                 return 0;
1245         }
1246         default:
1247                 return v4l_compat_translate_ioctl(inode, filp, cmd, arg,
1248                                                   driver_ioctl);
1249         }
1250         return 0;
1251 }
1252
1253 /*
1254  * em28xx_v4l2_do_ioctl()
1255  * This function is _not_ called directly, but from
1256  * em28xx_v4l2_ioctl. Userspace
1257  * copying is done already, arg is a kernel pointer.
1258  */
1259 static int em28xx_video_do_ioctl(struct inode *inode, struct file *filp,
1260                                  unsigned int cmd, void *arg)
1261 {
1262         struct em28xx *dev = filp->private_data;
1263
1264         if (!dev)
1265                 return -ENODEV;
1266
1267         if (video_debug > 1)
1268                 v4l_print_ioctl(dev->name,cmd);
1269
1270         switch (cmd) {
1271
1272                 /* --- capabilities ------------------------------------------ */
1273         case VIDIOC_QUERYCAP:
1274                 {
1275                 struct v4l2_capability *cap = arg;
1276
1277                 memset(cap, 0, sizeof(*cap));
1278                 strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1279                 strlcpy(cap->card, em28xx_boards[dev->model].name,
1280                         sizeof(cap->card));
1281                 strlcpy(cap->bus_info, dev->udev->dev.bus_id,
1282                         sizeof(cap->bus_info));
1283                 cap->version = EM28XX_VERSION_CODE;
1284                 cap->capabilities =
1285                                 V4L2_CAP_SLICED_VBI_CAPTURE |
1286                                 V4L2_CAP_VIDEO_CAPTURE |
1287                                 V4L2_CAP_AUDIO |
1288                                 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1289                 if (dev->has_tuner)
1290                         cap->capabilities |= V4L2_CAP_TUNER;
1291                 return 0;
1292         }
1293         /* --- capture ioctls ---------------------------------------- */
1294         case VIDIOC_ENUM_FMT:
1295         {
1296                 struct v4l2_fmtdesc *fmtd = arg;
1297
1298                 if (fmtd->index != 0)
1299                         return -EINVAL;
1300                 memset(fmtd, 0, sizeof(*fmtd));
1301                 fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1302                 strcpy(fmtd->description, "Packed YUY2");
1303                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1304                 memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1305                 return 0;
1306         }
1307         case VIDIOC_G_FMT:
1308                 return em28xx_get_fmt(dev, (struct v4l2_format *) arg);
1309
1310         case VIDIOC_TRY_FMT:
1311         case VIDIOC_S_FMT:
1312                 return em28xx_set_fmt(dev, cmd, (struct v4l2_format *)arg);
1313
1314         case VIDIOC_REQBUFS:
1315         {
1316                 struct v4l2_requestbuffers *rb = arg;
1317                 u32 i;
1318                 int ret;
1319
1320                 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1321                         rb->memory != V4L2_MEMORY_MMAP)
1322                         return -EINVAL;
1323
1324                 if (dev->io == IO_READ) {
1325                         em28xx_videodbg ("method is set to read;"
1326                                 " close and open the device again to"
1327                                 " choose the mmap I/O method\n");
1328                         return -EINVAL;
1329                 }
1330
1331                 for (i = 0; i < dev->num_frames; i++)
1332                         if (dev->frame[i].vma_use_count) {
1333                                 em28xx_videodbg ("VIDIOC_REQBUFS failed; previous buffers are still mapped\n");
1334                                 return -EINVAL;
1335                         }
1336
1337                 if (dev->stream == STREAM_ON) {
1338                         em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1339                         if ((ret = em28xx_stream_interrupt(dev)))
1340                                 return ret;
1341                 }
1342
1343                 em28xx_empty_framequeues(dev);
1344
1345                 em28xx_release_buffers(dev);
1346                 if (rb->count)
1347                         rb->count =
1348                                 em28xx_request_buffers(dev, rb->count);
1349
1350                 dev->frame_current = NULL;
1351
1352                 em28xx_videodbg ("VIDIOC_REQBUFS: setting io method to mmap: num bufs %i\n",
1353                                                 rb->count);
1354                 dev->io = rb->count ? IO_MMAP : IO_NONE;
1355                 return 0;
1356         }
1357         case VIDIOC_QUERYBUF:
1358         {
1359                 struct v4l2_buffer *b = arg;
1360
1361                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1362                         b->index >= dev->num_frames || dev->io != IO_MMAP)
1363                         return -EINVAL;
1364
1365                 memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1366
1367                 if (dev->frame[b->index].vma_use_count) {
1368                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1369                 }
1370                 if (dev->frame[b->index].state == F_DONE)
1371                         b->flags |= V4L2_BUF_FLAG_DONE;
1372                 else if (dev->frame[b->index].state != F_UNUSED)
1373                         b->flags |= V4L2_BUF_FLAG_QUEUED;
1374                 return 0;
1375         }
1376         case VIDIOC_QBUF:
1377         {
1378                 struct v4l2_buffer *b = arg;
1379                 unsigned long lock_flags;
1380
1381                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1382                         b->index >= dev->num_frames || dev->io != IO_MMAP) {
1383                         return -EINVAL;
1384                 }
1385
1386                 if (dev->frame[b->index].state != F_UNUSED) {
1387                         return -EAGAIN;
1388                 }
1389                 dev->frame[b->index].state = F_QUEUED;
1390
1391                 /* add frame to fifo */
1392                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1393                 list_add_tail(&dev->frame[b->index].frame,
1394                                 &dev->inqueue);
1395                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1396
1397                 return 0;
1398         }
1399         case VIDIOC_DQBUF:
1400         {
1401                 struct v4l2_buffer *b = arg;
1402                 struct em28xx_frame_t *f;
1403                 unsigned long lock_flags;
1404                 int ret = 0;
1405
1406                 if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1407                         || dev->io != IO_MMAP)
1408                         return -EINVAL;
1409
1410                 if (list_empty(&dev->outqueue)) {
1411                         if (dev->stream == STREAM_OFF)
1412                                 return -EINVAL;
1413                         if (filp->f_flags & O_NONBLOCK)
1414                                 return -EAGAIN;
1415                         ret = wait_event_interruptible
1416                                 (dev->wait_frame,
1417                                 (!list_empty(&dev->outqueue)) ||
1418                                 (dev->state & DEV_DISCONNECTED));
1419                         if (ret)
1420                                 return ret;
1421                         if (dev->state & DEV_DISCONNECTED)
1422                                 return -ENODEV;
1423                 }
1424
1425                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1426                 f = list_entry(dev->outqueue.next,
1427                                 struct em28xx_frame_t, frame);
1428                 list_del(dev->outqueue.next);
1429                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1430
1431                 f->state = F_UNUSED;
1432                 memcpy(b, &f->buf, sizeof(*b));
1433
1434                 if (f->vma_use_count)
1435                         b->flags |= V4L2_BUF_FLAG_MAPPED;
1436
1437                 return 0;
1438         }
1439         default:
1440                 return em28xx_do_ioctl(inode, filp, dev, cmd, arg,
1441                                        em28xx_video_do_ioctl);
1442         }
1443         return 0;
1444 }
1445
1446 /*
1447  * em28xx_v4l2_ioctl()
1448  * handle v4l2 ioctl the main action happens in em28xx_v4l2_do_ioctl()
1449  */
1450 static int em28xx_v4l2_ioctl(struct inode *inode, struct file *filp,
1451                              unsigned int cmd, unsigned long arg)
1452 {
1453         int ret = 0;
1454         struct em28xx *dev = filp->private_data;
1455
1456         if (mutex_lock_interruptible(&dev->fileop_lock))
1457                 return -ERESTARTSYS;
1458
1459         if (dev->state & DEV_DISCONNECTED) {
1460                 em28xx_errdev("v4l2 ioctl: device not present\n");
1461                 mutex_unlock(&dev->fileop_lock);
1462                 return -ENODEV;
1463         }
1464
1465         if (dev->state & DEV_MISCONFIGURED) {
1466                 em28xx_errdev
1467                     ("v4l2 ioctl: device is misconfigured; close and open it again\n");
1468                 mutex_unlock(&dev->fileop_lock);
1469                 return -EIO;
1470         }
1471
1472         ret = video_usercopy(inode, filp, cmd, arg, em28xx_video_do_ioctl);
1473
1474         mutex_unlock(&dev->fileop_lock);
1475
1476         return ret;
1477 }
1478
1479 static struct file_operations em28xx_v4l_fops = {
1480         .owner = THIS_MODULE,
1481         .open = em28xx_v4l2_open,
1482         .release = em28xx_v4l2_close,
1483         .ioctl = em28xx_v4l2_ioctl,
1484         .read = em28xx_v4l2_read,
1485         .poll = em28xx_v4l2_poll,
1486         .mmap = em28xx_v4l2_mmap,
1487         .llseek = no_llseek,
1488         .compat_ioctl   = v4l_compat_ioctl32,
1489
1490 };
1491
1492 /******************************** usb interface *****************************************/
1493
1494 /*
1495  * em28xx_init_dev()
1496  * allocates and inits the device structs, registers i2c bus and v4l device
1497  */
1498 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1499                            int minor, int model)
1500 {
1501         struct em28xx *dev = *devhandle;
1502         int retval = -ENOMEM;
1503         int errCode, i;
1504         unsigned int maxh, maxw;
1505
1506         dev->udev = udev;
1507         dev->model = model;
1508         mutex_init(&dev->lock);
1509         init_waitqueue_head(&dev->open);
1510
1511         dev->em28xx_write_regs = em28xx_write_regs;
1512         dev->em28xx_read_reg = em28xx_read_reg;
1513         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1514         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1515         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1516         dev->is_em2800 = em28xx_boards[model].is_em2800;
1517         dev->has_tuner = em28xx_boards[model].has_tuner;
1518         dev->has_msp34xx = em28xx_boards[model].has_msp34xx;
1519         dev->tda9887_conf = em28xx_boards[model].tda9887_conf;
1520         dev->decoder = em28xx_boards[model].decoder;
1521
1522         if (tuner >= 0)
1523                 dev->tuner_type = tuner;
1524         else
1525                 dev->tuner_type = em28xx_boards[model].tuner_type;
1526
1527         dev->video_inputs = em28xx_boards[model].vchannels;
1528
1529         for (i = 0; i < TVNORMS; i++)
1530                 if (em28xx_boards[model].norm == tvnorms[i].mode)
1531                         break;
1532         if (i == TVNORMS)
1533                 i = 0;
1534
1535         dev->tvnorm = &tvnorms[i];      /* set default norm */
1536
1537         em28xx_videodbg("tvnorm=%s\n", dev->tvnorm->name);
1538
1539         maxw = norm_maxw(dev);
1540         maxh = norm_maxh(dev);
1541
1542         /* set default image size */
1543         dev->width = maxw;
1544         dev->height = maxh;
1545         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1546         dev->field_size = dev->width * dev->height;
1547         dev->frame_size =
1548             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1549         dev->bytesperline = dev->width * 2;
1550         dev->hscale = 0;
1551         dev->vscale = 0;
1552         dev->ctl_input = 2;
1553
1554         /* setup video picture settings for saa7113h */
1555         memset(&dev->vpic, 0, sizeof(dev->vpic));
1556         dev->vpic.colour = 128 << 8;
1557         dev->vpic.hue = 128 << 8;
1558         dev->vpic.brightness = 128 << 8;
1559         dev->vpic.contrast = 192 << 8;
1560         dev->vpic.whiteness = 128 << 8; /* This one isn't used */
1561         dev->vpic.depth = 16;
1562         dev->vpic.palette = VIDEO_PALETTE_YUV422;
1563
1564         em28xx_pre_card_setup(dev);
1565 #ifdef CONFIG_MODULES
1566         /* request some modules */
1567         if (dev->decoder == EM28XX_SAA7113 || dev->decoder == EM28XX_SAA7114)
1568                 request_module("saa7115");
1569         if (dev->decoder == EM28XX_TVP5150)
1570                 request_module("tvp5150");
1571         if (dev->has_tuner)
1572                 request_module("tuner");
1573         if (dev->tda9887_conf)
1574                 request_module("tda9887");
1575 #endif
1576         errCode = em28xx_config(dev);
1577         if (errCode) {
1578                 em28xx_errdev("error configuring device\n");
1579                 em28xx_devused&=~(1<<dev->devno);
1580                 kfree(dev);
1581                 return -ENOMEM;
1582         }
1583
1584         mutex_lock(&dev->lock);
1585         /* register i2c bus */
1586         em28xx_i2c_register(dev);
1587
1588         /* Do board specific init and eeprom reading */
1589         em28xx_card_setup(dev);
1590
1591         /* configure the device */
1592         em28xx_config_i2c(dev);
1593
1594         mutex_unlock(&dev->lock);
1595
1596         errCode = em28xx_config(dev);
1597
1598 #ifdef CONFIG_MODULES
1599         if (dev->has_msp34xx)
1600                 request_module("msp3400");
1601 #endif
1602         /* allocate and fill v4l2 device struct */
1603         dev->vdev = video_device_alloc();
1604         if (NULL == dev->vdev) {
1605                 em28xx_errdev("cannot allocate video_device.\n");
1606                 em28xx_devused&=~(1<<dev->devno);
1607                 kfree(dev);
1608                 return -ENOMEM;
1609         }
1610
1611         dev->vbi_dev = video_device_alloc();
1612         if (NULL == dev->vbi_dev) {
1613                 em28xx_errdev("cannot allocate video_device.\n");
1614                 kfree(dev->vdev);
1615                 em28xx_devused&=~(1<<dev->devno);
1616                 kfree(dev);
1617                 return -ENOMEM;
1618         }
1619
1620         /* Fills VBI device info */
1621         dev->vbi_dev->type = VFL_TYPE_VBI;
1622         dev->vbi_dev->hardware = 0;
1623         dev->vbi_dev->fops = &em28xx_v4l_fops;
1624         dev->vbi_dev->minor = -1;
1625         dev->vbi_dev->dev = &dev->udev->dev;
1626         dev->vbi_dev->release = video_device_release;
1627         snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1628                                                          "em28xx",dev->devno,"vbi");
1629
1630         /* Fills CAPTURE device info */
1631         dev->vdev->type = VID_TYPE_CAPTURE;
1632         if (dev->has_tuner)
1633                 dev->vdev->type |= VID_TYPE_TUNER;
1634         dev->vdev->hardware = 0;
1635         dev->vdev->fops = &em28xx_v4l_fops;
1636         dev->vdev->minor = -1;
1637         dev->vdev->dev = &dev->udev->dev;
1638         dev->vdev->release = video_device_release;
1639         snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name), "%s#%d %s",
1640                                                          "em28xx",dev->devno,"video");
1641
1642         list_add_tail(&dev->devlist,&em28xx_devlist);
1643
1644         /* register v4l2 device */
1645         mutex_lock(&dev->lock);
1646         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1647                                          video_nr[dev->devno]))) {
1648                 em28xx_errdev("unable to register video device (error=%i).\n",
1649                               retval);
1650                 mutex_unlock(&dev->lock);
1651                 list_del(&dev->devlist);
1652                 video_device_release(dev->vdev);
1653                 em28xx_devused&=~(1<<dev->devno);
1654                 kfree(dev);
1655                 return -ENODEV;
1656         }
1657
1658         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1659                                         vbi_nr[dev->devno]) < 0) {
1660                 printk("unable to register vbi device\n");
1661                 mutex_unlock(&dev->lock);
1662                 list_del(&dev->devlist);
1663                 video_device_release(dev->vbi_dev);
1664                 video_device_release(dev->vdev);
1665                 em28xx_devused&=~(1<<dev->devno);
1666                 kfree(dev);
1667                 return -ENODEV;
1668         } else {
1669                 printk("registered VBI\n");
1670         }
1671
1672         if (dev->has_msp34xx) {
1673                 /* Send a reset to other chips via gpio */
1674                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1675                 udelay(2500);
1676                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1677                 udelay(2500);
1678
1679         }
1680         video_mux(dev, 0);
1681
1682         mutex_unlock(&dev->lock);
1683
1684         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1685                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1686                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1687
1688         return 0;
1689 }
1690
1691 /*
1692  * em28xx_usb_probe()
1693  * checks for supported devices
1694  */
1695 static int em28xx_usb_probe(struct usb_interface *interface,
1696                             const struct usb_device_id *id)
1697 {
1698         const struct usb_endpoint_descriptor *endpoint;
1699         struct usb_device *udev;
1700         struct usb_interface *uif;
1701         struct em28xx *dev = NULL;
1702         int retval = -ENODEV;
1703         int model,i,nr,ifnum;
1704
1705         udev = usb_get_dev(interface_to_usbdev(interface));
1706         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1707
1708         /* Check to see next free device and mark as used */
1709         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1710         em28xx_devused|=1<<nr;
1711
1712         /* Don't register audio interfaces */
1713         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1714                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1715                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1716                                 ifnum,
1717                                 interface->altsetting[0].desc.bInterfaceClass);
1718
1719                 em28xx_devused&=~(1<<nr);
1720                 return -ENODEV;
1721         }
1722
1723         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1724                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1725                         ifnum,
1726                         interface->altsetting[0].desc.bInterfaceClass);
1727
1728         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1729
1730         /* check if the the device has the iso in endpoint at the correct place */
1731         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1732             USB_ENDPOINT_XFER_ISOC) {
1733                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1734                 em28xx_devused&=~(1<<nr);
1735                 return -ENODEV;
1736         }
1737         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1738                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1739                 em28xx_devused&=~(1<<nr);
1740                 return -ENODEV;
1741         }
1742
1743         model=id->driver_info;
1744
1745         if (nr >= EM28XX_MAXBOARDS) {
1746                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1747                 em28xx_devused&=~(1<<nr);
1748                 return -ENOMEM;
1749         }
1750
1751         /* allocate memory for our device state and initialize it */
1752         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1753         if (dev == NULL) {
1754                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1755                 em28xx_devused&=~(1<<nr);
1756                 return -ENOMEM;
1757         }
1758
1759         snprintf(dev->name, 29, "em28xx #%d", nr);
1760         dev->devno=nr;
1761
1762         /* compute alternate max packet sizes */
1763         uif = udev->actconfig->interface[0];
1764
1765         dev->num_alt=uif->num_altsetting;
1766         em28xx_info("Alternate settings: %i\n",dev->num_alt);
1767 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1768         dev->alt_max_pkt_size = kmalloc(32*
1769                                                 dev->num_alt,GFP_KERNEL);
1770         if (dev->alt_max_pkt_size == NULL) {
1771                 em28xx_errdev("out of memory!\n");
1772                 em28xx_devused&=~(1<<nr);
1773                 return -ENOMEM;
1774         }
1775
1776         for (i = 0; i < dev->num_alt ; i++) {
1777                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1778                                                         wMaxPacketSize);
1779                 dev->alt_max_pkt_size[i] =
1780                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1781                 em28xx_info("Alternate setting %i, max size= %i\n",i,
1782                                                         dev->alt_max_pkt_size[i]);
1783         }
1784
1785         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1786                 model=card[nr];
1787
1788         if ((model==EM2800_BOARD_UNKNOWN)||(model==EM2820_BOARD_UNKNOWN)) {
1789                 em28xx_errdev( "Your board has no eeprom inside it and thus can't\n"
1790                         "%s: be autodetected.  Please pass card=<n> insmod option to\n"
1791                         "%s: workaround that.  Redirect complaints to the vendor of\n"
1792                         "%s: the TV card. Generic type will be used."
1793                         "%s: Best regards,\n"
1794                         "%s:         -- tux\n",
1795                         dev->name,dev->name,dev->name,dev->name,dev->name);
1796                 em28xx_errdev("%s: Here is a list of valid choices for the card=<n> insmod option:\n",
1797                         dev->name);
1798                 for (i = 0; i < em28xx_bcount; i++) {
1799                         em28xx_errdev("    card=%d -> %s\n", i,
1800                                                         em28xx_boards[i].name);
1801                 }
1802         }
1803
1804         /* allocate device struct */
1805         retval = em28xx_init_dev(&dev, udev, nr, model);
1806         if (retval)
1807                 return retval;
1808
1809         em28xx_info("Found %s\n", em28xx_boards[model].name);
1810
1811         /* save our data pointer in this interface device */
1812         usb_set_intfdata(interface, dev);
1813         return 0;
1814 }
1815
1816 /*
1817  * em28xx_usb_disconnect()
1818  * called when the device gets diconencted
1819  * video device will be unregistered on v4l2_close in case it is still open
1820  */
1821 static void em28xx_usb_disconnect(struct usb_interface *interface)
1822 {
1823         struct em28xx *dev = usb_get_intfdata(interface);
1824         usb_set_intfdata(interface, NULL);
1825
1826         if (!dev)
1827                 return;
1828
1829         down_write(&em28xx_disconnect);
1830
1831         mutex_lock(&dev->lock);
1832
1833         em28xx_info("disconnecting %s\n", dev->vdev->name);
1834
1835         wake_up_interruptible_all(&dev->open);
1836
1837         if (dev->users) {
1838                 em28xx_warn
1839                     ("device /dev/video%d is open! Deregistration and memory "
1840                      "deallocation are deferred on close.\n",
1841                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1842
1843                 dev->state |= DEV_MISCONFIGURED;
1844                 em28xx_uninit_isoc(dev);
1845                 dev->state |= DEV_DISCONNECTED;
1846                 wake_up_interruptible(&dev->wait_frame);
1847                 wake_up_interruptible(&dev->wait_stream);
1848         } else {
1849                 dev->state |= DEV_DISCONNECTED;
1850                 em28xx_release_resources(dev);
1851         }
1852
1853         mutex_unlock(&dev->lock);
1854
1855         if (!dev->users) {
1856                 kfree(dev->alt_max_pkt_size);
1857                 kfree(dev);
1858         }
1859
1860         up_write(&em28xx_disconnect);
1861 }
1862
1863 static struct usb_driver em28xx_usb_driver = {
1864         .name = "em28xx",
1865         .probe = em28xx_usb_probe,
1866         .disconnect = em28xx_usb_disconnect,
1867         .id_table = em28xx_id_table,
1868 };
1869
1870 static int __init em28xx_module_init(void)
1871 {
1872         int result;
1873
1874         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1875                (EM28XX_VERSION_CODE >> 16) & 0xff,
1876                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1877 #ifdef SNAPSHOT
1878         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1879                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1880 #endif
1881
1882         /* register this driver with the USB subsystem */
1883         result = usb_register(&em28xx_usb_driver);
1884         if (result)
1885                 em28xx_err(DRIVER_NAME
1886                            " usb_register failed. Error number %d.\n", result);
1887
1888         return result;
1889 }
1890
1891 static void __exit em28xx_module_exit(void)
1892 {
1893         /* deregister this driver with the USB subsystem */
1894         usb_deregister(&em28xx_usb_driver);
1895 }
1896
1897 module_init(em28xx_module_init);
1898 module_exit(em28xx_module_exit);