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/mutex.h>
  37
  38 #include "em28xx.h"
  39 #include <media/v4l2-common.h>
  40 #include <media/msp3400.h>
  41
  42 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  43                       "Markus Rechberger <mrechberger@gmail.com>, " \
  44                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  45                       "Sascha Sommer <saschasommer@freenet.de>"
  46
  47 #define DRIVER_NAME         "em28xx"
  48 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  49 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 1, 0)
  50
  51 #define em28xx_videodbg(fmt, arg...) do {\
  52         if (video_debug) \
  53                 printk(KERN_INFO "%s %s :"fmt, \
  54                          dev->name, __FUNCTION__ , ##arg); } while (0)
  55
  56 MODULE_AUTHOR(DRIVER_AUTHOR);
  57 MODULE_DESCRIPTION(DRIVER_DESC);
  58 MODULE_LICENSE("GPL");
  59
  60 static LIST_HEAD(em28xx_devlist);
  61
  62 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  63 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  64 static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  65 module_param_array(card,  int, NULL, 0444);
  66 module_param_array(video_nr, int, NULL, 0444);
  67 module_param_array(vbi_nr, int, NULL, 0444);
  68 MODULE_PARM_DESC(card,"card type");
  69 MODULE_PARM_DESC(video_nr,"video device numbers");
  70 MODULE_PARM_DESC(vbi_nr,"vbi device numbers");
  71
  72 static unsigned int video_debug = 0;
  73 module_param(video_debug,int,0644);
  74 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  75
  76 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  77 static unsigned long em28xx_devused;
  78
  79 /* supported controls */
  80 /* Common to all boards */
  81 static struct v4l2_queryctrl em28xx_qctrl[] = {
  82         {
  83                 .id = V4L2_CID_AUDIO_VOLUME,
  84                 .type = V4L2_CTRL_TYPE_INTEGER,
  85                 .name = "Volume",
  86                 .minimum = 0x0,
  87                 .maximum = 0x1f,
  88                 .step = 0x1,
  89                 .default_value = 0x1f,
  90                 .flags = 0,
  91         },{
  92                 .id = V4L2_CID_AUDIO_MUTE,
  93                 .type = V4L2_CTRL_TYPE_BOOLEAN,
  94                 .name = "Mute",
  95                 .minimum = 0,
  96                 .maximum = 1,
  97                 .step = 1,
  98                 .default_value = 1,
  99                 .flags = 0,
 100         }
 101 };
 102
 103 static struct usb_driver em28xx_usb_driver;
 104
 105
 106 /*********************  v4l2 interface  ******************************************/
 107
 108 /*
 109  * em28xx_config()
 110  * inits registers with sane defaults
 111  */
 112 static int em28xx_config(struct em28xx *dev)
 113 {
 114
 115         /* Sets I2C speed to 100 KHz */
 116         if (!dev->is_em2800)
 117                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 118
 119         /* enable vbi capturing */
 120
 121 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 122 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 123         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 124
 125         em28xx_audio_usb_mute(dev, 1);
 126         dev->mute = 1;          /* maybe not the right place... */
 127         dev->volume = 0x1f;
 128         em28xx_audio_analog_set(dev);
 129         em28xx_audio_analog_setup(dev);
 130         em28xx_outfmt_set_yuv422(dev);
 131         em28xx_colorlevels_set_default(dev);
 132         em28xx_compression_disable(dev);
 133
 134         return 0;
 135 }
 136
 137 /*
 138  * em28xx_config_i2c()
 139  * configure i2c attached devices
 140  */
 141 static void em28xx_config_i2c(struct em28xx *dev)
 142 {
 143         struct v4l2_routing route;
 144
 145         route.input = INPUT(dev->ctl_input)->vmux;
 146         route.output = 0;
 147         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 148         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 149         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 150 }
 151
 152 /*
 153  * em28xx_empty_framequeues()
 154  * prepare queues for incoming and outgoing frames
 155  */
 156 static void em28xx_empty_framequeues(struct em28xx *dev)
 157 {
 158         u32 i;
 159
 160         INIT_LIST_HEAD(&dev->inqueue);
 161         INIT_LIST_HEAD(&dev->outqueue);
 162
 163         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 164                 dev->frame[i].state = F_UNUSED;
 165                 dev->frame[i].buf.bytesused = 0;
 166         }
 167 }
 168
 169 static void video_mux(struct em28xx *dev, int index)
 170 {
 171         int ainput;
 172         struct v4l2_routing route;
 173
 174         route.input = INPUT(index)->vmux;
 175         route.output = 0;
 176         dev->ctl_input = index;
 177         dev->ctl_ainput = INPUT(index)->amux;
 178
 179         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 180
 181         if (dev->has_msp34xx) {
 182                 if (dev->i2s_speed)
 183                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 184                 route.input = dev->ctl_ainput;
 185                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 186                 /* Note: this is msp3400 specific */
 187                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 188                 ainput = EM28XX_AUDIO_SRC_TUNER;
 189                 em28xx_audio_source(dev, ainput);
 190         } else {
 191                 switch (dev->ctl_ainput) {
 192                         case 0:
 193                                 ainput = EM28XX_AUDIO_SRC_TUNER;
 194                                 break;
 195                         default:
 196                                 ainput = EM28XX_AUDIO_SRC_LINE;
 197                 }
 198                 em28xx_audio_source(dev, ainput);
 199         }
 200 }
 201
 202 /* Usage lock check functions */
 203 static int res_get(struct em28xx_fh *fh)
 204 {
 205         struct em28xx    *dev = fh->dev;
 206         int              rc   = 0;
 207
 208         /* This instance already has stream_on */
 209         if (fh->stream_on)
 210                 return rc;
 211
 212         mutex_lock(&dev->lock);
 213
 214         if (dev->stream_on)
 215                 rc = -EINVAL;
 216         else {
 217                 dev->stream_on = 1;
 218                 fh->stream_on  = 1;
 219         }
 220
 221         mutex_unlock(&dev->lock);
 222         return rc;
 223 }
 224
 225 static int res_check(struct em28xx_fh *fh)
 226 {
 227         return (fh->stream_on);
 228 }
 229
 230 static void res_free(struct em28xx_fh *fh)
 231 {
 232         struct em28xx    *dev = fh->dev;
 233
 234         mutex_lock(&dev->lock);
 235         fh->stream_on = 0;
 236         dev->stream_on = 0;
 237         mutex_unlock(&dev->lock);
 238 }
 239
 240 /*
 241  * em28xx_vm_open()
 242  */
 243 static void em28xx_vm_open(struct vm_area_struct *vma)
 244 {
 245         struct em28xx_frame_t *f = vma->vm_private_data;
 246         f->vma_use_count++;
 247 }
 248
 249 /*
 250  * em28xx_vm_close()
 251  */
 252 static void em28xx_vm_close(struct vm_area_struct *vma)
 253 {
 254         /* NOTE: buffers are not freed here */
 255         struct em28xx_frame_t *f = vma->vm_private_data;
 256
 257         if (f->vma_use_count)
 258                 f->vma_use_count--;
 259 }
 260
 261 static struct vm_operations_struct em28xx_vm_ops = {
 262         .open = em28xx_vm_open,
 263         .close = em28xx_vm_close,
 264 };
 265
 266
 267 /*
 268  * em28xx_get_ctrl()
 269  * return the current saturation, brightness or contrast, mute state
 270  */
 271 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 272 {
 273         switch (ctrl->id) {
 274         case V4L2_CID_AUDIO_MUTE:
 275                 ctrl->value = dev->mute;
 276                 return 0;
 277         case V4L2_CID_AUDIO_VOLUME:
 278                 ctrl->value = dev->volume;
 279                 return 0;
 280         default:
 281                 return -EINVAL;
 282         }
 283 }
 284
 285 /*
 286  * em28xx_set_ctrl()
 287  * mute or set new saturation, brightness or contrast
 288  */
 289 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 290 {
 291         switch (ctrl->id) {
 292         case V4L2_CID_AUDIO_MUTE:
 293                 if (ctrl->value != dev->mute) {
 294                         dev->mute = ctrl->value;
 295                         em28xx_audio_usb_mute(dev, ctrl->value);
 296                         return em28xx_audio_analog_set(dev);
 297                 }
 298                 return 0;
 299         case V4L2_CID_AUDIO_VOLUME:
 300                 dev->volume = ctrl->value;
 301                 return em28xx_audio_analog_set(dev);
 302         default:
 303                 return -EINVAL;
 304         }
 305 }
 306
 307 /*
 308  * em28xx_stream_interrupt()
 309  * stops streaming
 310  */
 311 static int em28xx_stream_interrupt(struct em28xx *dev)
 312 {
 313         int rc = 0;
 314
 315         /* stop reading from the device */
 316
 317         dev->stream = STREAM_INTERRUPT;
 318         rc = wait_event_timeout(dev->wait_stream,
 319                                 (dev->stream == STREAM_OFF) ||
 320                                 (dev->state & DEV_DISCONNECTED),
 321                                 EM28XX_URB_TIMEOUT);
 322
 323         if (rc) {
 324                 dev->state |= DEV_MISCONFIGURED;
 325                 em28xx_videodbg("device is misconfigured; close and "
 326                         "open /dev/video%d again\n",
 327                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 328                 return rc;
 329         }
 330
 331         return 0;
 332 }
 333
 334
 335 static int check_dev(struct em28xx *dev)
 336 {
 337         if (dev->state & DEV_DISCONNECTED) {
 338                 em28xx_errdev("v4l2 ioctl: device not present\n");
 339                 return -ENODEV;
 340         }
 341
 342         if (dev->state & DEV_MISCONFIGURED) {
 343                 em28xx_errdev("v4l2 ioctl: device is misconfigured; "
 344                               "close and open it again\n");
 345                 return -EIO;
 346         }
 347         return 0;
 348 }
 349
 350 static void get_scale(struct em28xx *dev,
 351                         unsigned int width, unsigned int height,
 352                         unsigned int *hscale, unsigned int *vscale)
 353 {
 354         unsigned int          maxw   = norm_maxw(dev);
 355         unsigned int          maxh   = norm_maxh(dev);
 356
 357         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
 358         if (*hscale >= 0x4000)
 359                 *hscale = 0x3fff;
 360
 361         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
 362         if (*vscale >= 0x4000)
 363                 *vscale = 0x3fff;
 364 }
 365
 366 /* ------------------------------------------------------------------
 367         IOCTL vidioc handling
 368    ------------------------------------------------------------------*/
 369
 370 static int vidioc_g_fmt_cap(struct file *file, void *priv,
 371                                         struct v4l2_format *f)
 372 {
 373         struct em28xx_fh      *fh  = priv;
 374         struct em28xx         *dev = fh->dev;
 375
 376         mutex_lock(&dev->lock);
 377
 378         f->fmt.pix.width = dev->width;
 379         f->fmt.pix.height = dev->height;
 380         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 381         f->fmt.pix.bytesperline = dev->bytesperline;
 382         f->fmt.pix.sizeimage = dev->frame_size;
 383         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 384
 385         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 386         f->fmt.pix.field = dev->interlaced ?
 387                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
 388
 389         mutex_unlock(&dev->lock);
 390         return 0;
 391 }
 392
 393 static int vidioc_try_fmt_cap(struct file *file, void *priv,
 394                         struct v4l2_format *f)
 395 {
 396         struct em28xx_fh      *fh    = priv;
 397         struct em28xx         *dev   = fh->dev;
 398         int                   width  = f->fmt.pix.width;
 399         int                   height = f->fmt.pix.height;
 400         unsigned int          maxw   = norm_maxw(dev);
 401         unsigned int          maxh   = norm_maxh(dev);
 402         unsigned int          hscale, vscale;
 403
 404         /* width must even because of the YUYV format
 405            height must be even because of interlacing */
 406         height &= 0xfffe;
 407         width &= 0xfffe;
 408
 409         if (height < 32)
 410                 height = 32;
 411         if (height > maxh)
 412                 height = maxh;
 413         if (width < 48)
 414                 width = 48;
 415         if (width > maxw)
 416                 width = maxw;
 417
 418         mutex_lock(&dev->lock);
 419
 420         if (dev->is_em2800) {
 421                 /* the em2800 can only scale down to 50% */
 422                 if (height % (maxh / 2))
 423                         height = maxh;
 424                 if (width % (maxw / 2))
 425                         width = maxw;
 426                 /* according to empiatech support */
 427                 /* the MaxPacketSize is to small to support */
 428                 /* framesizes larger than 640x480 @ 30 fps */
 429                 /* or 640x576 @ 25 fps. As this would cut */
 430                 /* of a part of the image we prefer */
 431                 /* 360x576 or 360x480 for now */
 432                 if (width == maxw && height == maxh)
 433                         width /= 2;
 434         }
 435
 436         get_scale(dev, width, height, &hscale, &vscale);
 437
 438         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 439         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 440
 441         f->fmt.pix.width = width;
 442         f->fmt.pix.height = height;
 443         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 444         f->fmt.pix.bytesperline = width * 2;
 445         f->fmt.pix.sizeimage = width * 2 * height;
 446         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 447         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 448
 449         mutex_unlock(&dev->lock);
 450         return 0;
 451 }
 452
 453 static int vidioc_s_fmt_cap(struct file *file, void *priv,
 454                         struct v4l2_format *f)
 455 {
 456         struct em28xx_fh      *fh  = priv;
 457         struct em28xx         *dev = fh->dev;
 458         int                   rc, i;
 459
 460         rc = check_dev(dev);
 461         if (rc < 0)
 462                 return rc;
 463
 464         vidioc_try_fmt_cap(file, priv, f);
 465
 466         mutex_lock(&dev->lock);
 467
 468         for (i = 0; i < dev->num_frames; i++)
 469                 if (dev->frame[i].vma_use_count) {
 470                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 471                                         "Unmap the buffers first.\n");
 472                         rc = -EINVAL;
 473                         goto err;
 474                 }
 475
 476         /* stop io in case it is already in progress */
 477         if (dev->stream == STREAM_ON) {
 478                 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
 479                 rc = em28xx_stream_interrupt(dev);
 480                 if (rc < 0)
 481                         goto err;
 482         }
 483
 484         em28xx_release_buffers(dev);
 485         dev->io = IO_NONE;
 486
 487         /* set new image size */
 488         dev->width = f->fmt.pix.width;
 489         dev->height = f->fmt.pix.height;
 490         dev->frame_size = dev->width * dev->height * 2;
 491         dev->field_size = dev->frame_size >> 1;
 492         dev->bytesperline = dev->width * 2;
 493         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 494
 495         /* FIXME: This is really weird! Why capture is starting with
 496            this ioctl ???
 497          */
 498         em28xx_uninit_isoc(dev);
 499         em28xx_set_alternate(dev);
 500         em28xx_capture_start(dev, 1);
 501         em28xx_resolution_set(dev);
 502         em28xx_init_isoc(dev);
 503         rc = 0;
 504
 505 err:
 506         mutex_unlock(&dev->lock);
 507         return rc;
 508 }
 509
 510 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
 511 {
 512         struct em28xx_fh   *fh  = priv;
 513         struct em28xx      *dev = fh->dev;
 514         struct v4l2_format f;
 515         int                rc;
 516
 517         rc = check_dev(dev);
 518         if (rc < 0)
 519                 return rc;
 520
 521         mutex_lock(&dev->lock);
 522         dev->norm = *norm;
 523         mutex_unlock(&dev->lock);
 524
 525         /* Adjusts width/height, if needed */
 526         f.fmt.pix.width = dev->width;
 527         f.fmt.pix.height = dev->height;
 528         vidioc_try_fmt_cap(file, priv, &f);
 529
 530         mutex_lock(&dev->lock);
 531
 532         /* set new image size */
 533         dev->width = f.fmt.pix.width;
 534         dev->height = f.fmt.pix.height;
 535         dev->frame_size = dev->width * dev->height * 2;
 536         dev->field_size = dev->frame_size >> 1;
 537         dev->bytesperline = dev->width * 2;
 538         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 539
 540         em28xx_resolution_set(dev);
 541         em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);
 542
 543         mutex_unlock(&dev->lock);
 544         return 0;
 545 }
 546
 547 static const char *iname[] = {
 548         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 549         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 550         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 551         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 552         [EM28XX_VMUX_SVIDEO]     = "S-Video",
 553         [EM28XX_VMUX_TELEVISION] = "Television",
 554         [EM28XX_VMUX_CABLE]      = "Cable TV",
 555         [EM28XX_VMUX_DVB]        = "DVB",
 556         [EM28XX_VMUX_DEBUG]      = "for debug only",
 557 };
 558
 559 static int vidioc_enum_input(struct file *file, void *priv,
 560                                 struct v4l2_input *i)
 561 {
 562         struct em28xx_fh   *fh  = priv;
 563         struct em28xx      *dev = fh->dev;
 564         unsigned int       n;
 565
 566         n = i->index;
 567         if (n >= MAX_EM28XX_INPUT)
 568                 return -EINVAL;
 569         if (0 == INPUT(n)->type)
 570                 return -EINVAL;
 571
 572         i->index = n;
 573         i->type = V4L2_INPUT_TYPE_CAMERA;
 574
 575         strcpy(i->name, iname[INPUT(n)->type]);
 576
 577         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 578                 (EM28XX_VMUX_CABLE == INPUT(n)->type))
 579                 i->type = V4L2_INPUT_TYPE_TUNER;
 580
 581         i->std = dev->vdev->tvnorms;
 582
 583         return 0;
 584 }
 585
 586 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 587 {
 588         struct em28xx_fh   *fh  = priv;
 589         struct em28xx      *dev = fh->dev;
 590
 591         *i = dev->ctl_input;
 592
 593         return 0;
 594 }
 595
 596 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 597 {
 598         struct em28xx_fh   *fh  = priv;
 599         struct em28xx      *dev = fh->dev;
 600         int                rc;
 601
 602         rc = check_dev(dev);
 603         if (rc < 0)
 604                 return rc;
 605
 606         if (i >= MAX_EM28XX_INPUT)
 607                 return -EINVAL;
 608         if (0 == INPUT(i)->type)
 609                 return -EINVAL;
 610
 611         mutex_lock(&dev->lock);
 612
 613         video_mux(dev, i);
 614
 615         mutex_unlock(&dev->lock);
 616         return 0;
 617 }
 618
 619 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 620 {
 621         struct em28xx_fh   *fh    = priv;
 622         struct em28xx      *dev   = fh->dev;
 623         unsigned int        index = a->index;
 624
 625         if (a->index > 1)
 626                 return -EINVAL;
 627
 628         index = dev->ctl_ainput;
 629
 630         if (index == 0) {
 631                 strcpy(a->name, "Television");
 632         } else {
 633                 strcpy(a->name, "Line In");
 634         }
 635         a->capability = V4L2_AUDCAP_STEREO;
 636         a->index = index;
 637
 638         return 0;
 639 }
 640
 641 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 642 {
 643         struct em28xx_fh   *fh  = priv;
 644         struct em28xx      *dev = fh->dev;
 645
 646         if (a->index != dev->ctl_ainput)
 647                 return -EINVAL;
 648
 649         return 0;
 650 }
 651
 652 static int vidioc_queryctrl(struct file *file, void *priv,
 653                                 struct v4l2_queryctrl *qc)
 654 {
 655         struct em28xx_fh      *fh  = priv;
 656         struct em28xx         *dev = fh->dev;
 657         int                   id  = qc->id;
 658         int                   i;
 659         int                   rc;
 660
 661         rc = check_dev(dev);
 662         if (rc < 0)
 663                 return rc;
 664
 665         memset(qc, 0, sizeof(*qc));
 666
 667         qc->id = id;
 668
 669         if (!dev->has_msp34xx) {
 670                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 671                         if (qc->id && qc->id == em28xx_qctrl[i].id) {
 672                                 memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
 673                                 return 0;
 674                         }
 675                 }
 676         }
 677         mutex_lock(&dev->lock);
 678         em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
 679         mutex_unlock(&dev->lock);
 680
 681         if (qc->type)
 682                 return 0;
 683         else
 684                 return -EINVAL;
 685 }
 686
 687 static int vidioc_g_ctrl(struct file *file, void *priv,
 688                                 struct v4l2_control *ctrl)
 689 {
 690         struct em28xx_fh      *fh  = priv;
 691         struct em28xx         *dev = fh->dev;
 692         int                   rc;
 693
 694         rc = check_dev(dev);
 695         if (rc < 0)
 696                 return rc;
 697         mutex_lock(&dev->lock);
 698
 699         if (!dev->has_msp34xx)
 700                 rc = em28xx_get_ctrl(dev, ctrl);
 701         else
 702                 rc = -EINVAL;
 703
 704         if (rc == -EINVAL) {
 705                 em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
 706                 rc = 0;
 707         }
 708
 709         mutex_unlock(&dev->lock);
 710         return rc;
 711 }
 712
 713 static int vidioc_s_ctrl(struct file *file, void *priv,
 714                                 struct v4l2_control *ctrl)
 715 {
 716         struct em28xx_fh      *fh  = priv;
 717         struct em28xx         *dev = fh->dev;
 718         u8                    i;
 719         int                   rc;
 720
 721         rc = check_dev(dev);
 722         if (rc < 0)
 723                 return rc;
 724
 725         mutex_lock(&dev->lock);
 726
 727         if (dev->has_msp34xx)
 728                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 729         else {
 730                 rc = 1;
 731                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 732                         if (ctrl->id == em28xx_qctrl[i].id) {
 733                                 if (ctrl->value < em28xx_qctrl[i].minimum ||
 734                                     ctrl->value > em28xx_qctrl[i].maximum) {
 735                                         rc = -ERANGE;
 736                                         break;
 737                                 }
 738
 739                                 rc = em28xx_set_ctrl(dev, ctrl);
 740                                 break;
 741                         }
 742                 }
 743         }
 744
 745         /* Control not found - try to send it to the attached devices */
 746         if (rc == 1) {
 747                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 748                 rc = 0;
 749         }
 750
 751         mutex_unlock(&dev->lock);
 752         return rc;
 753 }
 754
 755 static int vidioc_g_tuner(struct file *file, void *priv,
 756                                 struct v4l2_tuner *t)
 757 {
 758         struct em28xx_fh      *fh  = priv;
 759         struct em28xx         *dev = fh->dev;
 760         int                   rc;
 761
 762         rc = check_dev(dev);
 763         if (rc < 0)
 764                 return rc;
 765
 766         if (0 != t->index)
 767                 return -EINVAL;
 768
 769         strcpy(t->name, "Tuner");
 770
 771         mutex_lock(&dev->lock);
 772
 773         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
 774
 775         mutex_unlock(&dev->lock);
 776         return 0;
 777 }
 778
 779 static int vidioc_s_tuner(struct file *file, void *priv,
 780                                 struct v4l2_tuner *t)
 781 {
 782         struct em28xx_fh      *fh  = priv;
 783         struct em28xx         *dev = fh->dev;
 784         int                   rc;
 785
 786         rc = check_dev(dev);
 787         if (rc < 0)
 788                 return rc;
 789
 790         if (0 != t->index)
 791                 return -EINVAL;
 792
 793         mutex_lock(&dev->lock);
 794
 795         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
 796
 797         mutex_unlock(&dev->lock);
 798         return 0;
 799 }
 800
 801 static int vidioc_g_frequency(struct file *file, void *priv,
 802                                 struct v4l2_frequency *f)
 803 {
 804         struct em28xx_fh      *fh  = priv;
 805         struct em28xx         *dev = fh->dev;
 806
 807         f->type = V4L2_TUNER_ANALOG_TV;
 808         f->frequency = dev->ctl_freq;
 809
 810         return 0;
 811 }
 812
 813 static int vidioc_s_frequency(struct file *file, void *priv,
 814                                 struct v4l2_frequency *f)
 815 {
 816         struct em28xx_fh      *fh  = priv;
 817         struct em28xx         *dev = fh->dev;
 818         int                   rc;
 819
 820         rc = check_dev(dev);
 821         if (rc < 0)
 822                 return rc;
 823
 824         if (0 != f->tuner)
 825                 return -EINVAL;
 826
 827         if (V4L2_TUNER_ANALOG_TV != f->type)
 828                 return -EINVAL;
 829
 830         mutex_lock(&dev->lock);
 831
 832         dev->ctl_freq = f->frequency;
 833         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
 834
 835         mutex_unlock(&dev->lock);
 836         return 0;
 837 }
 838
 839 static int vidioc_cropcap(struct file *file, void *priv,
 840                                         struct v4l2_cropcap *cc)
 841 {
 842         struct em28xx_fh      *fh  = priv;
 843         struct em28xx         *dev = fh->dev;
 844
 845         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 846                 return -EINVAL;
 847
 848         cc->bounds.left = 0;
 849         cc->bounds.top = 0;
 850         cc->bounds.width = dev->width;
 851         cc->bounds.height = dev->height;
 852         cc->defrect = cc->bounds;
 853         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
 854         cc->pixelaspect.denominator = 59;
 855
 856         return 0;
 857 }
 858
 859 static int vidioc_streamon(struct file *file, void *priv,
 860                                         enum v4l2_buf_type type)
 861 {
 862         struct em28xx_fh      *fh  = priv;
 863         struct em28xx         *dev = fh->dev;
 864         int                   rc;
 865
 866         rc = check_dev(dev);
 867         if (rc < 0)
 868                 return rc;
 869
 870         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 871                 return -EINVAL;
 872
 873         if (list_empty(&dev->inqueue))
 874                 return -EINVAL;
 875
 876         mutex_lock(&dev->lock);
 877
 878         if (unlikely(res_get(fh) < 0)) {
 879                 mutex_unlock(&dev->lock);
 880                 return -EBUSY;
 881         }
 882
 883         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
 884
 885         mutex_unlock(&dev->lock);
 886         return 0;
 887 }
 888
 889 static int vidioc_streamoff(struct file *file, void *priv,
 890                                         enum v4l2_buf_type type)
 891 {
 892         struct em28xx_fh      *fh  = priv;
 893         struct em28xx         *dev = fh->dev;
 894         int                   rc;
 895
 896         rc = check_dev(dev);
 897         if (rc < 0)
 898                 return rc;
 899
 900         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 901                 return -EINVAL;
 902
 903         mutex_lock(&dev->lock);
 904
 905         if (dev->stream == STREAM_ON) {
 906                 em28xx_videodbg("VIDIOC_STREAMOFF: interrupting stream\n");
 907                 rc = em28xx_stream_interrupt(dev);
 908                 if (rc < 0) {
 909                         mutex_unlock(&dev->lock);
 910                         return rc;
 911                 }
 912         }
 913
 914         em28xx_empty_framequeues(dev);
 915
 916         mutex_unlock(&dev->lock);
 917         return 0;
 918 }
 919
 920 static int vidioc_querycap(struct file *file, void  *priv,
 921                                         struct v4l2_capability *cap)
 922 {
 923         struct em28xx_fh      *fh  = priv;
 924         struct em28xx         *dev = fh->dev;
 925
 926         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
 927         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
 928         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
 929
 930         cap->version = EM28XX_VERSION_CODE;
 931
 932         cap->capabilities =
 933                         V4L2_CAP_SLICED_VBI_CAPTURE |
 934                         V4L2_CAP_VIDEO_CAPTURE |
 935                         V4L2_CAP_AUDIO |
 936                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 937
 938         if (dev->has_tuner)
 939                 cap->capabilities |= V4L2_CAP_TUNER;
 940
 941         return 0;
 942 }
 943
 944 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
 945                                         struct v4l2_fmtdesc *fmtd)
 946 {
 947         if (fmtd->index != 0)
 948                 return -EINVAL;
 949
 950         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 951         strcpy(fmtd->description, "Packed YUY2");
 952         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 953         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
 954
 955         return 0;
 956 }
 957
 958 /* Sliced VBI ioctls */
 959 static int vidioc_g_fmt_vbi_capture(struct file *file, void *priv,
 960                                         struct v4l2_format *f)
 961 {
 962         struct em28xx_fh      *fh  = priv;
 963         struct em28xx         *dev = fh->dev;
 964         int                   rc;
 965
 966         rc = check_dev(dev);
 967         if (rc < 0)
 968                 return rc;
 969
 970         mutex_lock(&dev->lock);
 971
 972         f->fmt.sliced.service_set = 0;
 973
 974         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 975
 976         if (f->fmt.sliced.service_set == 0)
 977                 rc = -EINVAL;
 978
 979         mutex_unlock(&dev->lock);
 980         return rc;
 981 }
 982
 983 static int vidioc_try_set_vbi_capture(struct file *file, void *priv,
 984                         struct v4l2_format *f)
 985 {
 986         struct em28xx_fh      *fh  = priv;
 987         struct em28xx         *dev = fh->dev;
 988         int                   rc;
 989
 990         rc = check_dev(dev);
 991         if (rc < 0)
 992                 return rc;
 993
 994         mutex_lock(&dev->lock);
 995         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 996         mutex_unlock(&dev->lock);
 997
 998         if (f->fmt.sliced.service_set == 0)
 999                 return -EINVAL;
1000
1001         return 0;
1002 }
1003
1004
1005 static int vidioc_reqbufs(struct file *file, void *priv,
1006                           struct v4l2_requestbuffers *rb)
1007 {
1008         struct em28xx_fh      *fh  = priv;
1009         struct em28xx         *dev = fh->dev;
1010         u32                   i;
1011         int                   rc;
1012
1013         rc = check_dev(dev);
1014         if (rc < 0)
1015                 return rc;
1016
1017         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1018                 rb->memory != V4L2_MEMORY_MMAP)
1019                 return -EINVAL;
1020
1021         if (dev->io == IO_READ) {
1022                 em28xx_videodbg("method is set to read;"
1023                                 " close and open the device again to"
1024                                 " choose the mmap I/O method\n");
1025                 return -EINVAL;
1026         }
1027
1028         for (i = 0; i < dev->num_frames; i++)
1029                 if (dev->frame[i].vma_use_count) {
1030                         em28xx_videodbg("VIDIOC_REQBUFS failed; "
1031                                         "previous buffers are still mapped\n");
1032                         return -EINVAL;
1033                 }
1034
1035         mutex_lock(&dev->lock);
1036
1037         if (dev->stream == STREAM_ON) {
1038                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1039                 rc = em28xx_stream_interrupt(dev);
1040                 if (rc < 0) {
1041                         mutex_unlock(&dev->lock);
1042                         return rc;
1043                 }
1044         }
1045
1046         em28xx_empty_framequeues(dev);
1047
1048         em28xx_release_buffers(dev);
1049         if (rb->count)
1050                 rb->count = em28xx_request_buffers(dev, rb->count);
1051
1052         dev->frame_current = NULL;
1053         dev->io = rb->count ? IO_MMAP : IO_NONE;
1054
1055         mutex_unlock(&dev->lock);
1056         return 0;
1057 }
1058
1059 static int vidioc_querybuf(struct file *file, void *priv,
1060                            struct v4l2_buffer *b)
1061 {
1062         struct em28xx_fh      *fh  = priv;
1063         struct em28xx         *dev = fh->dev;
1064         int                   rc;
1065
1066         rc = check_dev(dev);
1067         if (rc < 0)
1068                 return rc;
1069
1070         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1071                 b->index >= dev->num_frames || dev->io != IO_MMAP)
1072                 return -EINVAL;
1073
1074         mutex_lock(&dev->lock);
1075
1076         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1077
1078         if (dev->frame[b->index].vma_use_count)
1079                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1080
1081         if (dev->frame[b->index].state == F_DONE)
1082                 b->flags |= V4L2_BUF_FLAG_DONE;
1083         else if (dev->frame[b->index].state != F_UNUSED)
1084                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1085
1086         mutex_unlock(&dev->lock);
1087         return 0;
1088 }
1089
1090 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1091 {
1092         struct em28xx_fh      *fh  = priv;
1093         struct em28xx         *dev = fh->dev;
1094         unsigned long         lock_flags;
1095         int                   rc;
1096
1097         rc = check_dev(dev);
1098         if (rc < 0)
1099                 return rc;
1100
1101         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE  || dev->io != IO_MMAP ||
1102                                                 b->index >= dev->num_frames)
1103                 return -EINVAL;
1104
1105         if (dev->frame[b->index].state != F_UNUSED)
1106                 return -EAGAIN;
1107
1108         dev->frame[b->index].state = F_QUEUED;
1109
1110         /* add frame to fifo */
1111         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1112         list_add_tail(&dev->frame[b->index].frame, &dev->inqueue);
1113         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1114
1115         return 0;
1116 }
1117
1118 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1119 {
1120         struct em28xx_fh      *fh  = priv;
1121         struct em28xx         *dev = fh->dev;
1122         int                   rc;
1123         struct em28xx_frame_t *f;
1124         unsigned long         lock_flags;
1125
1126         rc = check_dev(dev);
1127         if (rc < 0)
1128                 return rc;
1129
1130         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
1131                 return -EINVAL;
1132
1133         if (list_empty(&dev->outqueue)) {
1134                 if (dev->stream == STREAM_OFF)
1135                         return -EINVAL;
1136
1137                 if (file->f_flags & O_NONBLOCK)
1138                         return -EAGAIN;
1139
1140                 rc = wait_event_interruptible(dev->wait_frame,
1141                                         (!list_empty(&dev->outqueue)) ||
1142                                         (dev->state & DEV_DISCONNECTED));
1143                 if (rc)
1144                         return rc;
1145
1146                 if (dev->state & DEV_DISCONNECTED)
1147                         return -ENODEV;
1148         }
1149
1150         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1151         f = list_entry(dev->outqueue.next, struct em28xx_frame_t, frame);
1152         list_del(dev->outqueue.next);
1153         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1154
1155         f->state = F_UNUSED;
1156         memcpy(b, &f->buf, sizeof(*b));
1157
1158         if (f->vma_use_count)
1159                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1160
1161         return 0;
1162 }
1163
1164 /*
1165  * em28xx_v4l2_open()
1166  * inits the device and starts isoc transfer
1167  */
1168 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1169 {
1170         int minor = iminor(inode);
1171         int errCode = 0;
1172         struct em28xx *h,*dev = NULL;
1173         struct em28xx_fh *fh;
1174
1175         list_for_each_entry(h, &em28xx_devlist, devlist) {
1176                 if (h->vdev->minor == minor) {
1177                         dev  = h;
1178                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1179                 }
1180                 if (h->vbi_dev->minor == minor) {
1181                         dev  = h;
1182                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1183                 }
1184         }
1185         if (NULL == dev)
1186                 return -ENODEV;
1187
1188         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1189                                 minor,v4l2_type_names[dev->type],dev->users);
1190
1191         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1192
1193         if (!fh) {
1194                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1195                 return -ENOMEM;
1196         }
1197         mutex_lock(&dev->lock);
1198         fh->dev = dev;
1199         filp->private_data = fh;
1200
1201         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1202                 em28xx_set_alternate(dev);
1203
1204                 dev->width = norm_maxw(dev);
1205                 dev->height = norm_maxh(dev);
1206                 dev->frame_size = dev->width * dev->height * 2;
1207                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1208                 dev->bytesperline = dev->width * 2;
1209                 dev->hscale = 0;
1210                 dev->vscale = 0;
1211
1212                 em28xx_capture_start(dev, 1);
1213                 em28xx_resolution_set(dev);
1214
1215
1216                 /* start the transfer */
1217                 errCode = em28xx_init_isoc(dev);
1218                 if (errCode)
1219                         goto err;
1220
1221                 em28xx_empty_framequeues(dev);
1222         }
1223
1224         dev->users++;
1225
1226 err:
1227         mutex_unlock(&dev->lock);
1228         return errCode;
1229 }
1230
1231 /*
1232  * em28xx_realease_resources()
1233  * unregisters the v4l2,i2c and usb devices
1234  * called when the device gets disconected or at module unload
1235 */
1236 static void em28xx_release_resources(struct em28xx *dev)
1237 {
1238
1239         /*FIXME: I2C IR should be disconnected */
1240
1241         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1242                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1243                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1244         list_del(&dev->devlist);
1245         video_unregister_device(dev->vdev);
1246         video_unregister_device(dev->vbi_dev);
1247         em28xx_i2c_unregister(dev);
1248         usb_put_dev(dev->udev);
1249
1250
1251         /* Mark device as unused */
1252         em28xx_devused&=~(1<<dev->devno);
1253 }
1254
1255 /*
1256  * em28xx_v4l2_close()
1257  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
1258  */
1259 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1260 {
1261         struct em28xx_fh *fh  = filp->private_data;
1262         struct em28xx    *dev = fh->dev;
1263         int              errCode;
1264
1265         em28xx_videodbg("users=%d\n", dev->users);
1266
1267
1268         if (res_check(fh))
1269                 res_free(fh);
1270
1271         mutex_lock(&dev->lock);
1272
1273         if (dev->users == 1) {
1274                 em28xx_uninit_isoc(dev);
1275                 em28xx_release_buffers(dev);
1276                 dev->io = IO_NONE;
1277
1278                 /* the device is already disconnect,
1279                    free the remaining resources */
1280                 if (dev->state & DEV_DISCONNECTED) {
1281                         em28xx_release_resources(dev);
1282                         mutex_unlock(&dev->lock);
1283                         kfree(dev);
1284                         return 0;
1285                 }
1286
1287                 /* set alternate 0 */
1288                 dev->alt = 0;
1289                 em28xx_videodbg("setting alternate 0\n");
1290                 errCode = usb_set_interface(dev->udev, 0, 0);
1291                 if (errCode < 0) {
1292                         em28xx_errdev("cannot change alternate number to "
1293                                         "0 (error=%i)\n", errCode);
1294                 }
1295         }
1296         kfree(fh);
1297         dev->users--;
1298         wake_up_interruptible_nr(&dev->open, 1);
1299         mutex_unlock(&dev->lock);
1300         return 0;
1301 }
1302
1303 /*
1304  * em28xx_v4l2_read()
1305  * will allocate buffers when called for the first time
1306  */
1307 static ssize_t
1308 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
1309                  loff_t * f_pos)
1310 {
1311         struct em28xx_frame_t *f, *i;
1312         unsigned long lock_flags;
1313         int ret = 0;
1314         struct em28xx_fh *fh = filp->private_data;
1315         struct em28xx *dev = fh->dev;
1316
1317         /* FIXME: read() is not prepared to allow changing the video
1318            resolution while streaming. Seems a bug at em28xx_set_fmt
1319          */
1320
1321         if (unlikely(res_get(fh) < 0))
1322                 return -EBUSY;
1323
1324         mutex_lock(&dev->lock);
1325
1326         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1327                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
1328
1329         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
1330                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
1331                 em28xx_videodbg("not supported yet! ...\n");
1332                 if (copy_to_user(buf, "", 1)) {
1333                         mutex_unlock(&dev->lock);
1334                         return -EFAULT;
1335                 }
1336                 mutex_unlock(&dev->lock);
1337                 return (1);
1338         }
1339         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
1340                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
1341                 em28xx_videodbg("not supported yet! ...\n");
1342                 if (copy_to_user(buf, "", 1)) {
1343                         mutex_unlock(&dev->lock);
1344                         return -EFAULT;
1345                 }
1346                 mutex_unlock(&dev->lock);
1347                 return (1);
1348         }
1349
1350         if (dev->state & DEV_DISCONNECTED) {
1351                 em28xx_videodbg("device not present\n");
1352                 mutex_unlock(&dev->lock);
1353                 return -ENODEV;
1354         }
1355
1356         if (dev->state & DEV_MISCONFIGURED) {
1357                 em28xx_videodbg("device misconfigured; close and open it again\n");
1358                 mutex_unlock(&dev->lock);
1359                 return -EIO;
1360         }
1361
1362         if (dev->io == IO_MMAP) {
1363                 em28xx_videodbg ("IO method is set to mmap; close and open"
1364                                 " the device again to choose the read method\n");
1365                 mutex_unlock(&dev->lock);
1366                 return -EINVAL;
1367         }
1368
1369         if (dev->io == IO_NONE) {
1370                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
1371                         em28xx_errdev("read failed, not enough memory\n");
1372                         mutex_unlock(&dev->lock);
1373                         return -ENOMEM;
1374                 }
1375                 dev->io = IO_READ;
1376                 dev->stream = STREAM_ON;
1377                 em28xx_queue_unusedframes(dev);
1378         }
1379
1380         if (!count) {
1381                 mutex_unlock(&dev->lock);
1382                 return 0;
1383         }
1384
1385         if (list_empty(&dev->outqueue)) {
1386                 if (filp->f_flags & O_NONBLOCK) {
1387                         mutex_unlock(&dev->lock);
1388                         return -EAGAIN;
1389                 }
1390                 ret = wait_event_interruptible
1391                     (dev->wait_frame,
1392                      (!list_empty(&dev->outqueue)) ||
1393                      (dev->state & DEV_DISCONNECTED));
1394                 if (ret) {
1395                         mutex_unlock(&dev->lock);
1396                         return ret;
1397                 }
1398                 if (dev->state & DEV_DISCONNECTED) {
1399                         mutex_unlock(&dev->lock);
1400                         return -ENODEV;
1401                 }
1402                 dev->video_bytesread = 0;
1403         }
1404
1405         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
1406
1407         em28xx_queue_unusedframes(dev);
1408
1409         if (count > f->buf.length)
1410                 count = f->buf.length;
1411
1412         if ((dev->video_bytesread + count) > dev->frame_size)
1413                 count = dev->frame_size - dev->video_bytesread;
1414
1415         if (copy_to_user(buf, f->bufmem+dev->video_bytesread, count)) {
1416                 em28xx_err("Error while copying to user\n");
1417                 return -EFAULT;
1418         }
1419         dev->video_bytesread += count;
1420
1421         if (dev->video_bytesread == dev->frame_size) {
1422                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1423                 list_for_each_entry(i, &dev->outqueue, frame)
1424                                     i->state = F_UNUSED;
1425                 INIT_LIST_HEAD(&dev->outqueue);
1426                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1427
1428                 em28xx_queue_unusedframes(dev);
1429                 dev->video_bytesread = 0;
1430         }
1431
1432         *f_pos += count;
1433
1434         mutex_unlock(&dev->lock);
1435
1436         return count;
1437 }
1438
1439 /*
1440  * em28xx_v4l2_poll()
1441  * will allocate buffers when called for the first time
1442  */
1443 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1444 {
1445         unsigned int mask = 0;
1446         struct em28xx_fh *fh = filp->private_data;
1447         struct em28xx *dev = fh->dev;
1448
1449         if (unlikely(res_get(fh) < 0))
1450                 return POLLERR;
1451
1452         mutex_lock(&dev->lock);
1453
1454         if (dev->state & DEV_DISCONNECTED) {
1455                 em28xx_videodbg("device not present\n");
1456         } else if (dev->state & DEV_MISCONFIGURED) {
1457                 em28xx_videodbg("device is misconfigured; close and open it again\n");
1458         } else {
1459                 if (dev->io == IO_NONE) {
1460                         if (!em28xx_request_buffers
1461                             (dev, EM28XX_NUM_READ_FRAMES)) {
1462                                 em28xx_warn
1463                                     ("poll() failed, not enough memory\n");
1464                         } else {
1465                                 dev->io = IO_READ;
1466                                 dev->stream = STREAM_ON;
1467                         }
1468                 }
1469
1470                 if (dev->io == IO_READ) {
1471                         em28xx_queue_unusedframes(dev);
1472                         poll_wait(filp, &dev->wait_frame, wait);
1473
1474                         if (!list_empty(&dev->outqueue))
1475                                 mask |= POLLIN | POLLRDNORM;
1476
1477                         mutex_unlock(&dev->lock);
1478
1479                         return mask;
1480                 }
1481         }
1482
1483         mutex_unlock(&dev->lock);
1484         return POLLERR;
1485 }
1486
1487 /*
1488  * em28xx_v4l2_mmap()
1489  */
1490 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1491 {
1492         struct em28xx_fh *fh    = filp->private_data;
1493         struct em28xx    *dev   = fh->dev;
1494         unsigned long    size   = vma->vm_end - vma->vm_start;
1495         unsigned long    start  = vma->vm_start;
1496         void             *pos;
1497         u32              i;
1498
1499         if (unlikely(res_get(fh) < 0))
1500                 return -EBUSY;
1501
1502         mutex_lock(&dev->lock);
1503
1504         if (dev->state & DEV_DISCONNECTED) {
1505                 em28xx_videodbg("mmap: device not present\n");
1506                 mutex_unlock(&dev->lock);
1507                 return -ENODEV;
1508         }
1509
1510         if (dev->state & DEV_MISCONFIGURED) {
1511                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
1512                                                 "open it again\n");
1513                 mutex_unlock(&dev->lock);
1514                 return -EIO;
1515         }
1516
1517         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE)) {
1518                 mutex_unlock(&dev->lock);
1519                 return -EINVAL;
1520         }
1521
1522         if (size > PAGE_ALIGN(dev->frame[0].buf.length))
1523                 size = PAGE_ALIGN(dev->frame[0].buf.length);
1524
1525         for (i = 0; i < dev->num_frames; i++) {
1526                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1527                         break;
1528         }
1529         if (i == dev->num_frames) {
1530                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
1531                 mutex_unlock(&dev->lock);
1532                 return -EINVAL;
1533         }
1534
1535         /* VM_IO is eventually going to replace PageReserved altogether */
1536         vma->vm_flags |= VM_IO;
1537         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
1538
1539         pos = dev->frame[i].bufmem;
1540         while (size > 0) {      /* size is page-aligned */
1541                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1542                         em28xx_videodbg("mmap: vm_insert_page failed\n");
1543                         mutex_unlock(&dev->lock);
1544                         return -EAGAIN;
1545                 }
1546                 start += PAGE_SIZE;
1547                 pos += PAGE_SIZE;
1548                 size -= PAGE_SIZE;
1549         }
1550
1551         vma->vm_ops = &em28xx_vm_ops;
1552         vma->vm_private_data = &dev->frame[i];
1553
1554         em28xx_vm_open(vma);
1555         mutex_unlock(&dev->lock);
1556         return 0;
1557 }
1558
1559 static const struct file_operations em28xx_v4l_fops = {
1560         .owner         = THIS_MODULE,
1561         .open          = em28xx_v4l2_open,
1562         .release       = em28xx_v4l2_close,
1563         .read          = em28xx_v4l2_read,
1564         .poll          = em28xx_v4l2_poll,
1565         .mmap          = em28xx_v4l2_mmap,
1566         .ioctl         = video_ioctl2,
1567         .llseek        = no_llseek,
1568         .compat_ioctl  = v4l_compat_ioctl32,
1569 };
1570
1571 static const struct video_device em28xx_video_template = {
1572         .fops                       = &em28xx_v4l_fops,
1573         .release                    = video_device_release,
1574
1575         .minor                      = -1,
1576         .vidioc_querycap            = vidioc_querycap,
1577         .vidioc_enum_fmt_cap        = vidioc_enum_fmt_cap,
1578         .vidioc_g_fmt_cap           = vidioc_g_fmt_cap,
1579         .vidioc_try_fmt_cap         = vidioc_try_fmt_cap,
1580         .vidioc_s_fmt_cap           = vidioc_s_fmt_cap,
1581         .vidioc_g_audio             = vidioc_g_audio,
1582         .vidioc_s_audio             = vidioc_s_audio,
1583         .vidioc_cropcap             = vidioc_cropcap,
1584
1585         .vidioc_g_fmt_vbi_capture   = vidioc_g_fmt_vbi_capture,
1586         .vidioc_try_fmt_vbi_capture = vidioc_try_set_vbi_capture,
1587         .vidioc_s_fmt_vbi_capture   = vidioc_try_set_vbi_capture,
1588
1589         .vidioc_reqbufs             = vidioc_reqbufs,
1590         .vidioc_querybuf            = vidioc_querybuf,
1591         .vidioc_qbuf                = vidioc_qbuf,
1592         .vidioc_dqbuf               = vidioc_dqbuf,
1593         .vidioc_s_std               = vidioc_s_std,
1594         .vidioc_enum_input          = vidioc_enum_input,
1595         .vidioc_g_input             = vidioc_g_input,
1596         .vidioc_s_input             = vidioc_s_input,
1597         .vidioc_queryctrl           = vidioc_queryctrl,
1598         .vidioc_g_ctrl              = vidioc_g_ctrl,
1599         .vidioc_s_ctrl              = vidioc_s_ctrl,
1600         .vidioc_streamon            = vidioc_streamon,
1601         .vidioc_streamoff           = vidioc_streamoff,
1602         .vidioc_g_tuner             = vidioc_g_tuner,
1603         .vidioc_s_tuner             = vidioc_s_tuner,
1604         .vidioc_g_frequency         = vidioc_g_frequency,
1605         .vidioc_s_frequency         = vidioc_s_frequency,
1606
1607         .tvnorms                    = V4L2_STD_ALL,
1608         .current_norm               = V4L2_STD_PAL,
1609 };
1610
1611
1612 /******************************** usb interface *****************************************/
1613
1614 /*
1615  * em28xx_init_dev()
1616  * allocates and inits the device structs, registers i2c bus and v4l device
1617  */
1618 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1619                            int minor)
1620 {
1621         struct em28xx *dev = *devhandle;
1622         int retval = -ENOMEM;
1623         int errCode;
1624         unsigned int maxh, maxw;
1625
1626         dev->udev = udev;
1627         mutex_init(&dev->lock);
1628         spin_lock_init(&dev->queue_lock);
1629         init_waitqueue_head(&dev->open);
1630         init_waitqueue_head(&dev->wait_frame);
1631         init_waitqueue_head(&dev->wait_stream);
1632
1633         dev->em28xx_write_regs = em28xx_write_regs;
1634         dev->em28xx_read_reg = em28xx_read_reg;
1635         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1636         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1637         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1638         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1639
1640         em28xx_pre_card_setup(dev);
1641
1642         errCode = em28xx_config(dev);
1643         if (errCode) {
1644                 em28xx_errdev("error configuring device\n");
1645                 em28xx_devused &= ~(1<<dev->devno);
1646                 kfree(dev);
1647                 return -ENOMEM;
1648         }
1649
1650         /* register i2c bus */
1651         em28xx_i2c_register(dev);
1652
1653         /* Do board specific init and eeprom reading */
1654         em28xx_card_setup(dev);
1655
1656         /* configure the device */
1657         em28xx_config_i2c(dev);
1658
1659         /* set default norm */
1660         dev->norm = em28xx_video_template.current_norm;
1661
1662         maxw = norm_maxw(dev);
1663         maxh = norm_maxh(dev);
1664
1665         /* set default image size */
1666         dev->width = maxw;
1667         dev->height = maxh;
1668         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1669         dev->field_size = dev->width * dev->height;
1670         dev->frame_size =
1671             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1672         dev->bytesperline = dev->width * 2;
1673         dev->hscale = 0;
1674         dev->vscale = 0;
1675         dev->ctl_input = 2;
1676
1677         errCode = em28xx_config(dev);
1678
1679         /* allocate and fill video video_device struct */
1680         dev->vdev = video_device_alloc();
1681         if (NULL == dev->vdev) {
1682                 em28xx_errdev("cannot allocate video_device.\n");
1683                 em28xx_devused&=~(1<<dev->devno);
1684                 kfree(dev);
1685                 return -ENOMEM;
1686         }
1687         memcpy(dev->vdev, &em28xx_video_template,
1688                                         sizeof(em28xx_video_template));
1689         dev->vdev->type = VID_TYPE_CAPTURE;
1690         if (dev->has_tuner)
1691                 dev->vdev->type |= VID_TYPE_TUNER;
1692         dev->vdev->dev = &dev->udev->dev;
1693         snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name),
1694                  "%s#%d %s", "em28xx", dev->devno, "video");
1695
1696         /* Allocate and fill vbi video_device struct */
1697         dev->vbi_dev = video_device_alloc();
1698         if (NULL == dev->vbi_dev) {
1699                 em28xx_errdev("cannot allocate video_device.\n");
1700                 kfree(dev->vdev);
1701                 em28xx_devused&=~(1<<dev->devno);
1702                 kfree(dev);
1703                 return -ENOMEM;
1704         }
1705         memcpy(dev->vbi_dev, &em28xx_video_template,
1706                                         sizeof(em28xx_video_template));
1707         dev->vbi_dev->type = VFL_TYPE_VBI;
1708         dev->vbi_dev->dev = &dev->udev->dev;
1709         snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name),
1710                                 "%s#%d %s", "em28xx", dev->devno, "vbi");
1711
1712         list_add_tail(&dev->devlist,&em28xx_devlist);
1713
1714         if (dev->has_msp34xx) {
1715                 /* Send a reset to other chips via gpio */
1716                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1717                 msleep(3);
1718                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1719                 msleep(3);
1720         }
1721
1722         video_mux(dev, 0);
1723
1724         /* register v4l2 video video_device */
1725         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1726                                          video_nr[dev->devno]))) {
1727                 em28xx_errdev("unable to register video device (error=%i).\n",
1728                               retval);
1729                 mutex_unlock(&dev->lock);
1730                 list_del(&dev->devlist);
1731                 video_device_release(dev->vdev);
1732                 em28xx_devused&=~(1<<dev->devno);
1733                 kfree(dev);
1734                 return -ENODEV;
1735         }
1736
1737         /* register v4l2 vbi video_device */
1738         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1739                                         vbi_nr[dev->devno]) < 0) {
1740                 printk("unable to register vbi device\n");
1741                 mutex_unlock(&dev->lock);
1742                 list_del(&dev->devlist);
1743                 video_device_release(dev->vbi_dev);
1744                 video_device_release(dev->vdev);
1745                 em28xx_devused&=~(1<<dev->devno);
1746                 kfree(dev);
1747                 return -ENODEV;
1748         }
1749
1750         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1751                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1752                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1753
1754         return 0;
1755 }
1756
1757 /*
1758  * em28xx_usb_probe()
1759  * checks for supported devices
1760  */
1761 static int em28xx_usb_probe(struct usb_interface *interface,
1762                             const struct usb_device_id *id)
1763 {
1764         const struct usb_endpoint_descriptor *endpoint;
1765         struct usb_device *udev;
1766         struct usb_interface *uif;
1767         struct em28xx *dev = NULL;
1768         int retval = -ENODEV;
1769         int i, nr, ifnum;
1770
1771         udev = usb_get_dev(interface_to_usbdev(interface));
1772         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1773
1774         /* Check to see next free device and mark as used */
1775         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1776         em28xx_devused|=1<<nr;
1777
1778         /* Don't register audio interfaces */
1779         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1780                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1781                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1782                                 ifnum,
1783                                 interface->altsetting[0].desc.bInterfaceClass);
1784
1785                 em28xx_devused&=~(1<<nr);
1786                 return -ENODEV;
1787         }
1788
1789         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1790                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1791                         ifnum,
1792                         interface->altsetting[0].desc.bInterfaceClass);
1793
1794         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1795
1796         /* check if the device has the iso in endpoint at the correct place */
1797         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1798             USB_ENDPOINT_XFER_ISOC) {
1799                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1800                 em28xx_devused&=~(1<<nr);
1801                 return -ENODEV;
1802         }
1803         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1804                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1805                 em28xx_devused&=~(1<<nr);
1806                 return -ENODEV;
1807         }
1808
1809         if (nr >= EM28XX_MAXBOARDS) {
1810                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1811                 em28xx_devused&=~(1<<nr);
1812                 return -ENOMEM;
1813         }
1814
1815         /* allocate memory for our device state and initialize it */
1816         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1817         if (dev == NULL) {
1818                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1819                 em28xx_devused&=~(1<<nr);
1820                 return -ENOMEM;
1821         }
1822
1823         snprintf(dev->name, 29, "em28xx #%d", nr);
1824         dev->devno = nr;
1825         dev->model = id->driver_info;
1826
1827         /* compute alternate max packet sizes */
1828         uif = udev->actconfig->interface[0];
1829
1830         dev->num_alt=uif->num_altsetting;
1831         em28xx_info("Alternate settings: %i\n",dev->num_alt);
1832 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1833         dev->alt_max_pkt_size = kmalloc(32*
1834                                                 dev->num_alt,GFP_KERNEL);
1835         if (dev->alt_max_pkt_size == NULL) {
1836                 em28xx_errdev("out of memory!\n");
1837                 em28xx_devused&=~(1<<nr);
1838                 kfree(dev);
1839                 return -ENOMEM;
1840         }
1841
1842         for (i = 0; i < dev->num_alt ; i++) {
1843                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1844                                                         wMaxPacketSize);
1845                 dev->alt_max_pkt_size[i] =
1846                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1847                 em28xx_info("Alternate setting %i, max size= %i\n",i,
1848                                                         dev->alt_max_pkt_size[i]);
1849         }
1850
1851         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1852                 dev->model = card[nr];
1853
1854         /* allocate device struct */
1855         retval = em28xx_init_dev(&dev, udev, nr);
1856         if (retval)
1857                 return retval;
1858
1859         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
1860
1861         /* save our data pointer in this interface device */
1862         usb_set_intfdata(interface, dev);
1863         return 0;
1864 }
1865
1866 /*
1867  * em28xx_usb_disconnect()
1868  * called when the device gets diconencted
1869  * video device will be unregistered on v4l2_close in case it is still open
1870  */
1871 static void em28xx_usb_disconnect(struct usb_interface *interface)
1872 {
1873         struct em28xx *dev;
1874
1875         dev = usb_get_intfdata(interface);
1876         usb_set_intfdata(interface, NULL);
1877
1878         if (!dev)
1879                 return;
1880
1881         em28xx_info("disconnecting %s\n", dev->vdev->name);
1882
1883         /* wait until all current v4l2 io is finished then deallocate resources */
1884         mutex_lock(&dev->lock);
1885
1886         wake_up_interruptible_all(&dev->open);
1887
1888         if (dev->users) {
1889                 em28xx_warn
1890                     ("device /dev/video%d is open! Deregistration and memory "
1891                      "deallocation are deferred on close.\n",
1892                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1893
1894                 dev->state |= DEV_MISCONFIGURED;
1895                 em28xx_uninit_isoc(dev);
1896                 dev->state |= DEV_DISCONNECTED;
1897                 wake_up_interruptible(&dev->wait_frame);
1898                 wake_up_interruptible(&dev->wait_stream);
1899         } else {
1900                 dev->state |= DEV_DISCONNECTED;
1901                 em28xx_release_resources(dev);
1902         }
1903
1904
1905         mutex_unlock(&dev->lock);
1906
1907         if (!dev->users) {
1908                 kfree(dev->alt_max_pkt_size);
1909                 kfree(dev);
1910         }
1911
1912 }
1913
1914 static struct usb_driver em28xx_usb_driver = {
1915         .name = "em28xx",
1916         .probe = em28xx_usb_probe,
1917         .disconnect = em28xx_usb_disconnect,
1918         .id_table = em28xx_id_table,
1919 };
1920
1921 static int __init em28xx_module_init(void)
1922 {
1923         int result;
1924
1925         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
1926                (EM28XX_VERSION_CODE >> 16) & 0xff,
1927                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
1928 #ifdef SNAPSHOT
1929         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
1930                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
1931 #endif
1932
1933         /* register this driver with the USB subsystem */
1934         result = usb_register(&em28xx_usb_driver);
1935         if (result)
1936                 em28xx_err(DRIVER_NAME
1937                            " usb_register failed. Error number %d.\n", result);
1938
1939         return result;
1940 }
1941
1942 static void __exit em28xx_module_exit(void)
1943 {
1944         /* deregister this driver with the USB subsystem */
1945         usb_deregister(&em28xx_usb_driver);
1946 }
1947
1948 module_init(em28xx_module_init);
1949 module_exit(em28xx_module_exit);