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         dev->mute = 1;          /* maybe not the right place... */
 126         dev->volume = 0x1f;
 127
 128         /* Init XCLK_REG, audio muted */
 129         dev->em28xx_write_regs(dev, XCLK_REG, "\x87", 1);
 130
 131         em28xx_audio_analog_set(dev);
 132         em28xx_outfmt_set_yuv422(dev);
 133         em28xx_colorlevels_set_default(dev);
 134         em28xx_compression_disable(dev);
 135
 136         return 0;
 137 }
 138
 139 /*
 140  * em28xx_config_i2c()
 141  * configure i2c attached devices
 142  */
 143 static void em28xx_config_i2c(struct em28xx *dev)
 144 {
 145         struct v4l2_routing route;
 146
 147         route.input = INPUT(dev->ctl_input)->vmux;
 148         route.output = 0;
 149         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 150         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 151         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 152 }
 153
 154 /*
 155  * em28xx_empty_framequeues()
 156  * prepare queues for incoming and outgoing frames
 157  */
 158 static void em28xx_empty_framequeues(struct em28xx *dev)
 159 {
 160         u32 i;
 161
 162         INIT_LIST_HEAD(&dev->inqueue);
 163         INIT_LIST_HEAD(&dev->outqueue);
 164
 165         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 166                 dev->frame[i].state = F_UNUSED;
 167                 dev->frame[i].buf.bytesused = 0;
 168         }
 169 }
 170
 171 static void video_mux(struct em28xx *dev, int index)
 172 {
 173         struct v4l2_routing route;
 174
 175         route.input = INPUT(index)->vmux;
 176         route.output = 0;
 177         dev->ctl_input = index;
 178         dev->ctl_ainput = INPUT(index)->amux;
 179
 180         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 181
 182         if (dev->has_msp34xx) {
 183                 if (dev->i2s_speed)
 184                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 185                 route.input = dev->ctl_ainput;
 186                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 187                 /* Note: this is msp3400 specific */
 188                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 189         }
 190
 191         em28xx_set_audio_source(dev);
 192 }
 193
 194 /* Usage lock check functions */
 195 static int res_get(struct em28xx_fh *fh)
 196 {
 197         struct em28xx    *dev = fh->dev;
 198         int              rc   = 0;
 199
 200         /* This instance already has stream_on */
 201         if (fh->stream_on)
 202                 return rc;
 203
 204         mutex_lock(&dev->lock);
 205
 206         if (dev->stream_on)
 207                 rc = -EINVAL;
 208         else {
 209                 dev->stream_on = 1;
 210                 fh->stream_on  = 1;
 211         }
 212
 213         mutex_unlock(&dev->lock);
 214         return rc;
 215 }
 216
 217 static int res_check(struct em28xx_fh *fh)
 218 {
 219         return (fh->stream_on);
 220 }
 221
 222 static void res_free(struct em28xx_fh *fh)
 223 {
 224         struct em28xx    *dev = fh->dev;
 225
 226         mutex_lock(&dev->lock);
 227         fh->stream_on = 0;
 228         dev->stream_on = 0;
 229         mutex_unlock(&dev->lock);
 230 }
 231
 232 /*
 233  * em28xx_vm_open()
 234  */
 235 static void em28xx_vm_open(struct vm_area_struct *vma)
 236 {
 237         struct em28xx_frame_t *f = vma->vm_private_data;
 238         f->vma_use_count++;
 239 }
 240
 241 /*
 242  * em28xx_vm_close()
 243  */
 244 static void em28xx_vm_close(struct vm_area_struct *vma)
 245 {
 246         /* NOTE: buffers are not freed here */
 247         struct em28xx_frame_t *f = vma->vm_private_data;
 248
 249         if (f->vma_use_count)
 250                 f->vma_use_count--;
 251 }
 252
 253 static struct vm_operations_struct em28xx_vm_ops = {
 254         .open = em28xx_vm_open,
 255         .close = em28xx_vm_close,
 256 };
 257
 258
 259 /*
 260  * em28xx_get_ctrl()
 261  * return the current saturation, brightness or contrast, mute state
 262  */
 263 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 264 {
 265         switch (ctrl->id) {
 266         case V4L2_CID_AUDIO_MUTE:
 267                 ctrl->value = dev->mute;
 268                 return 0;
 269         case V4L2_CID_AUDIO_VOLUME:
 270                 ctrl->value = dev->volume;
 271                 return 0;
 272         default:
 273                 return -EINVAL;
 274         }
 275 }
 276
 277 /*
 278  * em28xx_set_ctrl()
 279  * mute or set new saturation, brightness or contrast
 280  */
 281 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 282 {
 283         switch (ctrl->id) {
 284         case V4L2_CID_AUDIO_MUTE:
 285                 if (ctrl->value != dev->mute) {
 286                         dev->mute = ctrl->value;
 287                         return em28xx_audio_analog_set(dev);
 288                 }
 289                 return 0;
 290         case V4L2_CID_AUDIO_VOLUME:
 291                 dev->volume = ctrl->value;
 292                 return em28xx_audio_analog_set(dev);
 293         default:
 294                 return -EINVAL;
 295         }
 296 }
 297
 298 /*
 299  * em28xx_stream_interrupt()
 300  * stops streaming
 301  */
 302 static int em28xx_stream_interrupt(struct em28xx *dev)
 303 {
 304         int rc = 0;
 305
 306         /* stop reading from the device */
 307
 308         dev->stream = STREAM_INTERRUPT;
 309         rc = wait_event_timeout(dev->wait_stream,
 310                                 (dev->stream == STREAM_OFF) ||
 311                                 (dev->state & DEV_DISCONNECTED),
 312                                 EM28XX_URB_TIMEOUT);
 313
 314         if (rc) {
 315                 dev->state |= DEV_MISCONFIGURED;
 316                 em28xx_videodbg("device is misconfigured; close and "
 317                         "open /dev/video%d again\n",
 318                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 319                 return rc;
 320         }
 321
 322         return 0;
 323 }
 324
 325
 326 static int check_dev(struct em28xx *dev)
 327 {
 328         if (dev->state & DEV_DISCONNECTED) {
 329                 em28xx_errdev("v4l2 ioctl: device not present\n");
 330                 return -ENODEV;
 331         }
 332
 333         if (dev->state & DEV_MISCONFIGURED) {
 334                 em28xx_errdev("v4l2 ioctl: device is misconfigured; "
 335                               "close and open it again\n");
 336                 return -EIO;
 337         }
 338         return 0;
 339 }
 340
 341 static void get_scale(struct em28xx *dev,
 342                         unsigned int width, unsigned int height,
 343                         unsigned int *hscale, unsigned int *vscale)
 344 {
 345         unsigned int          maxw   = norm_maxw(dev);
 346         unsigned int          maxh   = norm_maxh(dev);
 347
 348         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
 349         if (*hscale >= 0x4000)
 350                 *hscale = 0x3fff;
 351
 352         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
 353         if (*vscale >= 0x4000)
 354                 *vscale = 0x3fff;
 355 }
 356
 357 /* ------------------------------------------------------------------
 358         IOCTL vidioc handling
 359    ------------------------------------------------------------------*/
 360
 361 static int vidioc_g_fmt_cap(struct file *file, void *priv,
 362                                         struct v4l2_format *f)
 363 {
 364         struct em28xx_fh      *fh  = priv;
 365         struct em28xx         *dev = fh->dev;
 366
 367         mutex_lock(&dev->lock);
 368
 369         f->fmt.pix.width = dev->width;
 370         f->fmt.pix.height = dev->height;
 371         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 372         f->fmt.pix.bytesperline = dev->bytesperline;
 373         f->fmt.pix.sizeimage = dev->frame_size;
 374         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 375
 376         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 377         f->fmt.pix.field = dev->interlaced ?
 378                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
 379
 380         mutex_unlock(&dev->lock);
 381         return 0;
 382 }
 383
 384 static int vidioc_try_fmt_cap(struct file *file, void *priv,
 385                         struct v4l2_format *f)
 386 {
 387         struct em28xx_fh      *fh    = priv;
 388         struct em28xx         *dev   = fh->dev;
 389         int                   width  = f->fmt.pix.width;
 390         int                   height = f->fmt.pix.height;
 391         unsigned int          maxw   = norm_maxw(dev);
 392         unsigned int          maxh   = norm_maxh(dev);
 393         unsigned int          hscale, vscale;
 394
 395         /* width must even because of the YUYV format
 396            height must be even because of interlacing */
 397         height &= 0xfffe;
 398         width &= 0xfffe;
 399
 400         if (height < 32)
 401                 height = 32;
 402         if (height > maxh)
 403                 height = maxh;
 404         if (width < 48)
 405                 width = 48;
 406         if (width > maxw)
 407                 width = maxw;
 408
 409         mutex_lock(&dev->lock);
 410
 411         if (dev->is_em2800) {
 412                 /* the em2800 can only scale down to 50% */
 413                 if (height % (maxh / 2))
 414                         height = maxh;
 415                 if (width % (maxw / 2))
 416                         width = maxw;
 417                 /* according to empiatech support */
 418                 /* the MaxPacketSize is to small to support */
 419                 /* framesizes larger than 640x480 @ 30 fps */
 420                 /* or 640x576 @ 25 fps. As this would cut */
 421                 /* of a part of the image we prefer */
 422                 /* 360x576 or 360x480 for now */
 423                 if (width == maxw && height == maxh)
 424                         width /= 2;
 425         }
 426
 427         get_scale(dev, width, height, &hscale, &vscale);
 428
 429         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 430         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 431
 432         f->fmt.pix.width = width;
 433         f->fmt.pix.height = height;
 434         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 435         f->fmt.pix.bytesperline = width * 2;
 436         f->fmt.pix.sizeimage = width * 2 * height;
 437         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 438         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 439
 440         mutex_unlock(&dev->lock);
 441         return 0;
 442 }
 443
 444 static int vidioc_s_fmt_cap(struct file *file, void *priv,
 445                         struct v4l2_format *f)
 446 {
 447         struct em28xx_fh      *fh  = priv;
 448         struct em28xx         *dev = fh->dev;
 449         int                   rc, i;
 450
 451         rc = check_dev(dev);
 452         if (rc < 0)
 453                 return rc;
 454
 455         vidioc_try_fmt_cap(file, priv, f);
 456
 457         mutex_lock(&dev->lock);
 458
 459         for (i = 0; i < dev->num_frames; i++)
 460                 if (dev->frame[i].vma_use_count) {
 461                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 462                                         "Unmap the buffers first.\n");
 463                         rc = -EINVAL;
 464                         goto err;
 465                 }
 466
 467         /* stop io in case it is already in progress */
 468         if (dev->stream == STREAM_ON) {
 469                 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
 470                 rc = em28xx_stream_interrupt(dev);
 471                 if (rc < 0)
 472                         goto err;
 473         }
 474
 475         em28xx_release_buffers(dev);
 476         dev->io = IO_NONE;
 477
 478         /* set new image size */
 479         dev->width = f->fmt.pix.width;
 480         dev->height = f->fmt.pix.height;
 481         dev->frame_size = dev->width * dev->height * 2;
 482         dev->field_size = dev->frame_size >> 1;
 483         dev->bytesperline = dev->width * 2;
 484         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 485
 486         /* FIXME: This is really weird! Why capture is starting with
 487            this ioctl ???
 488          */
 489         em28xx_uninit_isoc(dev);
 490         em28xx_set_alternate(dev);
 491         em28xx_capture_start(dev, 1);
 492         em28xx_resolution_set(dev);
 493         em28xx_init_isoc(dev);
 494         rc = 0;
 495
 496 err:
 497         mutex_unlock(&dev->lock);
 498         return rc;
 499 }
 500
 501 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
 502 {
 503         struct em28xx_fh   *fh  = priv;
 504         struct em28xx      *dev = fh->dev;
 505         struct v4l2_format f;
 506         int                rc;
 507
 508         rc = check_dev(dev);
 509         if (rc < 0)
 510                 return rc;
 511
 512         mutex_lock(&dev->lock);
 513         dev->norm = *norm;
 514         mutex_unlock(&dev->lock);
 515
 516         /* Adjusts width/height, if needed */
 517         f.fmt.pix.width = dev->width;
 518         f.fmt.pix.height = dev->height;
 519         vidioc_try_fmt_cap(file, priv, &f);
 520
 521         mutex_lock(&dev->lock);
 522
 523         /* set new image size */
 524         dev->width = f.fmt.pix.width;
 525         dev->height = f.fmt.pix.height;
 526         dev->frame_size = dev->width * dev->height * 2;
 527         dev->field_size = dev->frame_size >> 1;
 528         dev->bytesperline = dev->width * 2;
 529         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 530
 531         em28xx_resolution_set(dev);
 532         em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);
 533
 534         mutex_unlock(&dev->lock);
 535         return 0;
 536 }
 537
 538 static const char *iname[] = {
 539         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 540         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 541         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 542         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 543         [EM28XX_VMUX_SVIDEO]     = "S-Video",
 544         [EM28XX_VMUX_TELEVISION] = "Television",
 545         [EM28XX_VMUX_CABLE]      = "Cable TV",
 546         [EM28XX_VMUX_DVB]        = "DVB",
 547         [EM28XX_VMUX_DEBUG]      = "for debug only",
 548 };
 549
 550 static int vidioc_enum_input(struct file *file, void *priv,
 551                                 struct v4l2_input *i)
 552 {
 553         struct em28xx_fh   *fh  = priv;
 554         struct em28xx      *dev = fh->dev;
 555         unsigned int       n;
 556
 557         n = i->index;
 558         if (n >= MAX_EM28XX_INPUT)
 559                 return -EINVAL;
 560         if (0 == INPUT(n)->type)
 561                 return -EINVAL;
 562
 563         i->index = n;
 564         i->type = V4L2_INPUT_TYPE_CAMERA;
 565
 566         strcpy(i->name, iname[INPUT(n)->type]);
 567
 568         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 569                 (EM28XX_VMUX_CABLE == INPUT(n)->type))
 570                 i->type = V4L2_INPUT_TYPE_TUNER;
 571
 572         i->std = dev->vdev->tvnorms;
 573
 574         return 0;
 575 }
 576
 577 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 578 {
 579         struct em28xx_fh   *fh  = priv;
 580         struct em28xx      *dev = fh->dev;
 581
 582         *i = dev->ctl_input;
 583
 584         return 0;
 585 }
 586
 587 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 588 {
 589         struct em28xx_fh   *fh  = priv;
 590         struct em28xx      *dev = fh->dev;
 591         int                rc;
 592
 593         rc = check_dev(dev);
 594         if (rc < 0)
 595                 return rc;
 596
 597         if (i >= MAX_EM28XX_INPUT)
 598                 return -EINVAL;
 599         if (0 == INPUT(i)->type)
 600                 return -EINVAL;
 601
 602         mutex_lock(&dev->lock);
 603
 604         video_mux(dev, i);
 605
 606         mutex_unlock(&dev->lock);
 607         return 0;
 608 }
 609
 610 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 611 {
 612         struct em28xx_fh   *fh    = priv;
 613         struct em28xx      *dev   = fh->dev;
 614         unsigned int        index = a->index;
 615
 616         if (a->index > 1)
 617                 return -EINVAL;
 618
 619         index = dev->ctl_ainput;
 620
 621         if (index == 0) {
 622                 strcpy(a->name, "Television");
 623         } else {
 624                 strcpy(a->name, "Line In");
 625         }
 626         a->capability = V4L2_AUDCAP_STEREO;
 627         a->index = index;
 628
 629         return 0;
 630 }
 631
 632 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 633 {
 634         struct em28xx_fh   *fh  = priv;
 635         struct em28xx      *dev = fh->dev;
 636
 637         if (a->index != dev->ctl_ainput)
 638                 return -EINVAL;
 639
 640         return 0;
 641 }
 642
 643 static int vidioc_queryctrl(struct file *file, void *priv,
 644                                 struct v4l2_queryctrl *qc)
 645 {
 646         struct em28xx_fh      *fh  = priv;
 647         struct em28xx         *dev = fh->dev;
 648         int                   id  = qc->id;
 649         int                   i;
 650         int                   rc;
 651
 652         rc = check_dev(dev);
 653         if (rc < 0)
 654                 return rc;
 655
 656         memset(qc, 0, sizeof(*qc));
 657
 658         qc->id = id;
 659
 660         if (!dev->has_msp34xx) {
 661                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 662                         if (qc->id && qc->id == em28xx_qctrl[i].id) {
 663                                 memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
 664                                 return 0;
 665                         }
 666                 }
 667         }
 668         mutex_lock(&dev->lock);
 669         em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
 670         mutex_unlock(&dev->lock);
 671
 672         if (qc->type)
 673                 return 0;
 674         else
 675                 return -EINVAL;
 676 }
 677
 678 static int vidioc_g_ctrl(struct file *file, void *priv,
 679                                 struct v4l2_control *ctrl)
 680 {
 681         struct em28xx_fh      *fh  = priv;
 682         struct em28xx         *dev = fh->dev;
 683         int                   rc;
 684
 685         rc = check_dev(dev);
 686         if (rc < 0)
 687                 return rc;
 688         mutex_lock(&dev->lock);
 689
 690         if (!dev->has_msp34xx)
 691                 rc = em28xx_get_ctrl(dev, ctrl);
 692         else
 693                 rc = -EINVAL;
 694
 695         if (rc == -EINVAL) {
 696                 em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
 697                 rc = 0;
 698         }
 699
 700         mutex_unlock(&dev->lock);
 701         return rc;
 702 }
 703
 704 static int vidioc_s_ctrl(struct file *file, void *priv,
 705                                 struct v4l2_control *ctrl)
 706 {
 707         struct em28xx_fh      *fh  = priv;
 708         struct em28xx         *dev = fh->dev;
 709         u8                    i;
 710         int                   rc;
 711
 712         rc = check_dev(dev);
 713         if (rc < 0)
 714                 return rc;
 715
 716         mutex_lock(&dev->lock);
 717
 718         if (dev->has_msp34xx)
 719                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 720         else {
 721                 rc = 1;
 722                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 723                         if (ctrl->id == em28xx_qctrl[i].id) {
 724                                 if (ctrl->value < em28xx_qctrl[i].minimum ||
 725                                     ctrl->value > em28xx_qctrl[i].maximum) {
 726                                         rc = -ERANGE;
 727                                         break;
 728                                 }
 729
 730                                 rc = em28xx_set_ctrl(dev, ctrl);
 731                                 break;
 732                         }
 733                 }
 734         }
 735
 736         /* Control not found - try to send it to the attached devices */
 737         if (rc == 1) {
 738                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 739                 rc = 0;
 740         }
 741
 742         mutex_unlock(&dev->lock);
 743         return rc;
 744 }
 745
 746 static int vidioc_g_tuner(struct file *file, void *priv,
 747                                 struct v4l2_tuner *t)
 748 {
 749         struct em28xx_fh      *fh  = priv;
 750         struct em28xx         *dev = fh->dev;
 751         int                   rc;
 752
 753         rc = check_dev(dev);
 754         if (rc < 0)
 755                 return rc;
 756
 757         if (0 != t->index)
 758                 return -EINVAL;
 759
 760         strcpy(t->name, "Tuner");
 761
 762         mutex_lock(&dev->lock);
 763
 764         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
 765
 766         mutex_unlock(&dev->lock);
 767         return 0;
 768 }
 769
 770 static int vidioc_s_tuner(struct file *file, void *priv,
 771                                 struct v4l2_tuner *t)
 772 {
 773         struct em28xx_fh      *fh  = priv;
 774         struct em28xx         *dev = fh->dev;
 775         int                   rc;
 776
 777         rc = check_dev(dev);
 778         if (rc < 0)
 779                 return rc;
 780
 781         if (0 != t->index)
 782                 return -EINVAL;
 783
 784         mutex_lock(&dev->lock);
 785
 786         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
 787
 788         mutex_unlock(&dev->lock);
 789         return 0;
 790 }
 791
 792 static int vidioc_g_frequency(struct file *file, void *priv,
 793                                 struct v4l2_frequency *f)
 794 {
 795         struct em28xx_fh      *fh  = priv;
 796         struct em28xx         *dev = fh->dev;
 797
 798         f->type = V4L2_TUNER_ANALOG_TV;
 799         f->frequency = dev->ctl_freq;
 800
 801         return 0;
 802 }
 803
 804 static int vidioc_s_frequency(struct file *file, void *priv,
 805                                 struct v4l2_frequency *f)
 806 {
 807         struct em28xx_fh      *fh  = priv;
 808         struct em28xx         *dev = fh->dev;
 809         int                   rc;
 810
 811         rc = check_dev(dev);
 812         if (rc < 0)
 813                 return rc;
 814
 815         if (0 != f->tuner)
 816                 return -EINVAL;
 817
 818         if (V4L2_TUNER_ANALOG_TV != f->type)
 819                 return -EINVAL;
 820
 821         mutex_lock(&dev->lock);
 822
 823         dev->ctl_freq = f->frequency;
 824         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
 825
 826         mutex_unlock(&dev->lock);
 827         return 0;
 828 }
 829
 830 static int vidioc_cropcap(struct file *file, void *priv,
 831                                         struct v4l2_cropcap *cc)
 832 {
 833         struct em28xx_fh      *fh  = priv;
 834         struct em28xx         *dev = fh->dev;
 835
 836         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 837                 return -EINVAL;
 838
 839         cc->bounds.left = 0;
 840         cc->bounds.top = 0;
 841         cc->bounds.width = dev->width;
 842         cc->bounds.height = dev->height;
 843         cc->defrect = cc->bounds;
 844         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
 845         cc->pixelaspect.denominator = 59;
 846
 847         return 0;
 848 }
 849
 850 static int vidioc_streamon(struct file *file, void *priv,
 851                                         enum v4l2_buf_type type)
 852 {
 853         struct em28xx_fh      *fh  = priv;
 854         struct em28xx         *dev = fh->dev;
 855         int                   rc;
 856
 857         rc = check_dev(dev);
 858         if (rc < 0)
 859                 return rc;
 860
 861         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 862                 return -EINVAL;
 863
 864         if (list_empty(&dev->inqueue))
 865                 return -EINVAL;
 866
 867         mutex_lock(&dev->lock);
 868
 869         if (unlikely(res_get(fh) < 0)) {
 870                 mutex_unlock(&dev->lock);
 871                 return -EBUSY;
 872         }
 873
 874         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
 875
 876         mutex_unlock(&dev->lock);
 877         return 0;
 878 }
 879
 880 static int vidioc_streamoff(struct file *file, void *priv,
 881                                         enum v4l2_buf_type type)
 882 {
 883         struct em28xx_fh      *fh  = priv;
 884         struct em28xx         *dev = fh->dev;
 885         int                   rc;
 886
 887         rc = check_dev(dev);
 888         if (rc < 0)
 889                 return rc;
 890
 891         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 892                 return -EINVAL;
 893
 894         mutex_lock(&dev->lock);
 895
 896         if (dev->stream == STREAM_ON) {
 897                 em28xx_videodbg("VIDIOC_STREAMOFF: interrupting stream\n");
 898                 rc = em28xx_stream_interrupt(dev);
 899                 if (rc < 0) {
 900                         mutex_unlock(&dev->lock);
 901                         return rc;
 902                 }
 903         }
 904
 905         em28xx_empty_framequeues(dev);
 906
 907         mutex_unlock(&dev->lock);
 908         return 0;
 909 }
 910
 911 static int vidioc_querycap(struct file *file, void  *priv,
 912                                         struct v4l2_capability *cap)
 913 {
 914         struct em28xx_fh      *fh  = priv;
 915         struct em28xx         *dev = fh->dev;
 916
 917         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
 918         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
 919         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
 920
 921         cap->version = EM28XX_VERSION_CODE;
 922
 923         cap->capabilities =
 924                         V4L2_CAP_SLICED_VBI_CAPTURE |
 925                         V4L2_CAP_VIDEO_CAPTURE |
 926                         V4L2_CAP_AUDIO |
 927                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 928
 929         if (dev->has_tuner)
 930                 cap->capabilities |= V4L2_CAP_TUNER;
 931
 932         return 0;
 933 }
 934
 935 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
 936                                         struct v4l2_fmtdesc *fmtd)
 937 {
 938         if (fmtd->index != 0)
 939                 return -EINVAL;
 940
 941         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 942         strcpy(fmtd->description, "Packed YUY2");
 943         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 944         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
 945
 946         return 0;
 947 }
 948
 949 /* Sliced VBI ioctls */
 950 static int vidioc_g_fmt_vbi_capture(struct file *file, void *priv,
 951                                         struct v4l2_format *f)
 952 {
 953         struct em28xx_fh      *fh  = priv;
 954         struct em28xx         *dev = fh->dev;
 955         int                   rc;
 956
 957         rc = check_dev(dev);
 958         if (rc < 0)
 959                 return rc;
 960
 961         mutex_lock(&dev->lock);
 962
 963         f->fmt.sliced.service_set = 0;
 964
 965         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 966
 967         if (f->fmt.sliced.service_set == 0)
 968                 rc = -EINVAL;
 969
 970         mutex_unlock(&dev->lock);
 971         return rc;
 972 }
 973
 974 static int vidioc_try_set_vbi_capture(struct file *file, void *priv,
 975                         struct v4l2_format *f)
 976 {
 977         struct em28xx_fh      *fh  = priv;
 978         struct em28xx         *dev = fh->dev;
 979         int                   rc;
 980
 981         rc = check_dev(dev);
 982         if (rc < 0)
 983                 return rc;
 984
 985         mutex_lock(&dev->lock);
 986         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 987         mutex_unlock(&dev->lock);
 988
 989         if (f->fmt.sliced.service_set == 0)
 990                 return -EINVAL;
 991
 992         return 0;
 993 }
 994
 995
 996 static int vidioc_reqbufs(struct file *file, void *priv,
 997                           struct v4l2_requestbuffers *rb)
 998 {
 999         struct em28xx_fh      *fh  = priv;
1000         struct em28xx         *dev = fh->dev;
1001         u32                   i;
1002         int                   rc;
1003
1004         rc = check_dev(dev);
1005         if (rc < 0)
1006                 return rc;
1007
1008         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1009                 rb->memory != V4L2_MEMORY_MMAP)
1010                 return -EINVAL;
1011
1012         if (dev->io == IO_READ) {
1013                 em28xx_videodbg("method is set to read;"
1014                                 " close and open the device again to"
1015                                 " choose the mmap I/O method\n");
1016                 return -EINVAL;
1017         }
1018
1019         for (i = 0; i < dev->num_frames; i++)
1020                 if (dev->frame[i].vma_use_count) {
1021                         em28xx_videodbg("VIDIOC_REQBUFS failed; "
1022                                         "previous buffers are still mapped\n");
1023                         return -EINVAL;
1024                 }
1025
1026         mutex_lock(&dev->lock);
1027
1028         if (dev->stream == STREAM_ON) {
1029                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1030                 rc = em28xx_stream_interrupt(dev);
1031                 if (rc < 0) {
1032                         mutex_unlock(&dev->lock);
1033                         return rc;
1034                 }
1035         }
1036
1037         em28xx_empty_framequeues(dev);
1038
1039         em28xx_release_buffers(dev);
1040         if (rb->count)
1041                 rb->count = em28xx_request_buffers(dev, rb->count);
1042
1043         dev->frame_current = NULL;
1044         dev->io = rb->count ? IO_MMAP : IO_NONE;
1045
1046         mutex_unlock(&dev->lock);
1047         return 0;
1048 }
1049
1050 static int vidioc_querybuf(struct file *file, void *priv,
1051                            struct v4l2_buffer *b)
1052 {
1053         struct em28xx_fh      *fh  = priv;
1054         struct em28xx         *dev = fh->dev;
1055         int                   rc;
1056
1057         rc = check_dev(dev);
1058         if (rc < 0)
1059                 return rc;
1060
1061         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1062                 b->index >= dev->num_frames || dev->io != IO_MMAP)
1063                 return -EINVAL;
1064
1065         mutex_lock(&dev->lock);
1066
1067         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1068
1069         if (dev->frame[b->index].vma_use_count)
1070                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1071
1072         if (dev->frame[b->index].state == F_DONE)
1073                 b->flags |= V4L2_BUF_FLAG_DONE;
1074         else if (dev->frame[b->index].state != F_UNUSED)
1075                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1076
1077         mutex_unlock(&dev->lock);
1078         return 0;
1079 }
1080
1081 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1082 {
1083         struct em28xx_fh      *fh  = priv;
1084         struct em28xx         *dev = fh->dev;
1085         unsigned long         lock_flags;
1086         int                   rc;
1087
1088         rc = check_dev(dev);
1089         if (rc < 0)
1090                 return rc;
1091
1092         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE  || dev->io != IO_MMAP ||
1093                                                 b->index >= dev->num_frames)
1094                 return -EINVAL;
1095
1096         if (dev->frame[b->index].state != F_UNUSED)
1097                 return -EAGAIN;
1098
1099         dev->frame[b->index].state = F_QUEUED;
1100
1101         /* add frame to fifo */
1102         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1103         list_add_tail(&dev->frame[b->index].frame, &dev->inqueue);
1104         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1105
1106         return 0;
1107 }
1108
1109 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1110 {
1111         struct em28xx_fh      *fh  = priv;
1112         struct em28xx         *dev = fh->dev;
1113         int                   rc;
1114         struct em28xx_frame_t *f;
1115         unsigned long         lock_flags;
1116
1117         rc = check_dev(dev);
1118         if (rc < 0)
1119                 return rc;
1120
1121         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
1122                 return -EINVAL;
1123
1124         if (list_empty(&dev->outqueue)) {
1125                 if (dev->stream == STREAM_OFF)
1126                         return -EINVAL;
1127
1128                 if (file->f_flags & O_NONBLOCK)
1129                         return -EAGAIN;
1130
1131                 rc = wait_event_interruptible(dev->wait_frame,
1132                                         (!list_empty(&dev->outqueue)) ||
1133                                         (dev->state & DEV_DISCONNECTED));
1134                 if (rc)
1135                         return rc;
1136
1137                 if (dev->state & DEV_DISCONNECTED)
1138                         return -ENODEV;
1139         }
1140
1141         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1142         f = list_entry(dev->outqueue.next, struct em28xx_frame_t, frame);
1143         list_del(dev->outqueue.next);
1144         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1145
1146         f->state = F_UNUSED;
1147         memcpy(b, &f->buf, sizeof(*b));
1148
1149         if (f->vma_use_count)
1150                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1151
1152         return 0;
1153 }
1154
1155 /*
1156  * em28xx_v4l2_open()
1157  * inits the device and starts isoc transfer
1158  */
1159 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1160 {
1161         int minor = iminor(inode);
1162         int errCode = 0;
1163         struct em28xx *h,*dev = NULL;
1164         struct em28xx_fh *fh;
1165
1166         list_for_each_entry(h, &em28xx_devlist, devlist) {
1167                 if (h->vdev->minor == minor) {
1168                         dev  = h;
1169                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1170                 }
1171                 if (h->vbi_dev->minor == minor) {
1172                         dev  = h;
1173                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1174                 }
1175         }
1176         if (NULL == dev)
1177                 return -ENODEV;
1178
1179         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1180                                 minor,v4l2_type_names[dev->type],dev->users);
1181
1182         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1183
1184         if (!fh) {
1185                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1186                 return -ENOMEM;
1187         }
1188         mutex_lock(&dev->lock);
1189         fh->dev = dev;
1190         filp->private_data = fh;
1191
1192         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1193                 em28xx_set_alternate(dev);
1194
1195                 dev->width = norm_maxw(dev);
1196                 dev->height = norm_maxh(dev);
1197                 dev->frame_size = dev->width * dev->height * 2;
1198                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1199                 dev->bytesperline = dev->width * 2;
1200                 dev->hscale = 0;
1201                 dev->vscale = 0;
1202
1203                 em28xx_capture_start(dev, 1);
1204                 em28xx_resolution_set(dev);
1205
1206
1207                 /* start the transfer */
1208                 errCode = em28xx_init_isoc(dev);
1209                 if (errCode)
1210                         goto err;
1211
1212                 em28xx_empty_framequeues(dev);
1213         }
1214
1215         dev->users++;
1216
1217 err:
1218         mutex_unlock(&dev->lock);
1219         return errCode;
1220 }
1221
1222 /*
1223  * em28xx_realease_resources()
1224  * unregisters the v4l2,i2c and usb devices
1225  * called when the device gets disconected or at module unload
1226 */
1227 static void em28xx_release_resources(struct em28xx *dev)
1228 {
1229
1230         /*FIXME: I2C IR should be disconnected */
1231
1232         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1233                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1234                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1235         list_del(&dev->devlist);
1236         video_unregister_device(dev->vdev);
1237         video_unregister_device(dev->vbi_dev);
1238         em28xx_i2c_unregister(dev);
1239         usb_put_dev(dev->udev);
1240
1241
1242         /* Mark device as unused */
1243         em28xx_devused&=~(1<<dev->devno);
1244 }
1245
1246 /*
1247  * em28xx_v4l2_close()
1248  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
1249  */
1250 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1251 {
1252         struct em28xx_fh *fh  = filp->private_data;
1253         struct em28xx    *dev = fh->dev;
1254         int              errCode;
1255
1256         em28xx_videodbg("users=%d\n", dev->users);
1257
1258
1259         if (res_check(fh))
1260                 res_free(fh);
1261
1262         mutex_lock(&dev->lock);
1263
1264         if (dev->users == 1) {
1265                 em28xx_uninit_isoc(dev);
1266                 em28xx_release_buffers(dev);
1267                 dev->io = IO_NONE;
1268
1269                 /* the device is already disconnect,
1270                    free the remaining resources */
1271                 if (dev->state & DEV_DISCONNECTED) {
1272                         em28xx_release_resources(dev);
1273                         mutex_unlock(&dev->lock);
1274                         kfree(dev);
1275                         return 0;
1276                 }
1277
1278                 /* set alternate 0 */
1279                 dev->alt = 0;
1280                 em28xx_videodbg("setting alternate 0\n");
1281                 errCode = usb_set_interface(dev->udev, 0, 0);
1282                 if (errCode < 0) {
1283                         em28xx_errdev("cannot change alternate number to "
1284                                         "0 (error=%i)\n", errCode);
1285                 }
1286         }
1287         kfree(fh);
1288         dev->users--;
1289         wake_up_interruptible_nr(&dev->open, 1);
1290         mutex_unlock(&dev->lock);
1291         return 0;
1292 }
1293
1294 /*
1295  * em28xx_v4l2_read()
1296  * will allocate buffers when called for the first time
1297  */
1298 static ssize_t
1299 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
1300                  loff_t * f_pos)
1301 {
1302         struct em28xx_frame_t *f, *i;
1303         unsigned long lock_flags;
1304         int ret = 0;
1305         struct em28xx_fh *fh = filp->private_data;
1306         struct em28xx *dev = fh->dev;
1307
1308         /* FIXME: read() is not prepared to allow changing the video
1309            resolution while streaming. Seems a bug at em28xx_set_fmt
1310          */
1311
1312         if (unlikely(res_get(fh) < 0))
1313                 return -EBUSY;
1314
1315         mutex_lock(&dev->lock);
1316
1317         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1318                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
1319
1320         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
1321                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
1322                 em28xx_videodbg("not supported yet! ...\n");
1323                 if (copy_to_user(buf, "", 1)) {
1324                         mutex_unlock(&dev->lock);
1325                         return -EFAULT;
1326                 }
1327                 mutex_unlock(&dev->lock);
1328                 return (1);
1329         }
1330         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
1331                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
1332                 em28xx_videodbg("not supported yet! ...\n");
1333                 if (copy_to_user(buf, "", 1)) {
1334                         mutex_unlock(&dev->lock);
1335                         return -EFAULT;
1336                 }
1337                 mutex_unlock(&dev->lock);
1338                 return (1);
1339         }
1340
1341         if (dev->state & DEV_DISCONNECTED) {
1342                 em28xx_videodbg("device not present\n");
1343                 mutex_unlock(&dev->lock);
1344                 return -ENODEV;
1345         }
1346
1347         if (dev->state & DEV_MISCONFIGURED) {
1348                 em28xx_videodbg("device misconfigured; close and open it again\n");
1349                 mutex_unlock(&dev->lock);
1350                 return -EIO;
1351         }
1352
1353         if (dev->io == IO_MMAP) {
1354                 em28xx_videodbg ("IO method is set to mmap; close and open"
1355                                 " the device again to choose the read method\n");
1356                 mutex_unlock(&dev->lock);
1357                 return -EINVAL;
1358         }
1359
1360         if (dev->io == IO_NONE) {
1361                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
1362                         em28xx_errdev("read failed, not enough memory\n");
1363                         mutex_unlock(&dev->lock);
1364                         return -ENOMEM;
1365                 }
1366                 dev->io = IO_READ;
1367                 dev->stream = STREAM_ON;
1368                 em28xx_queue_unusedframes(dev);
1369         }
1370
1371         if (!count) {
1372                 mutex_unlock(&dev->lock);
1373                 return 0;
1374         }
1375
1376         if (list_empty(&dev->outqueue)) {
1377                 if (filp->f_flags & O_NONBLOCK) {
1378                         mutex_unlock(&dev->lock);
1379                         return -EAGAIN;
1380                 }
1381                 ret = wait_event_interruptible
1382                     (dev->wait_frame,
1383                      (!list_empty(&dev->outqueue)) ||
1384                      (dev->state & DEV_DISCONNECTED));
1385                 if (ret) {
1386                         mutex_unlock(&dev->lock);
1387                         return ret;
1388                 }
1389                 if (dev->state & DEV_DISCONNECTED) {
1390                         mutex_unlock(&dev->lock);
1391                         return -ENODEV;
1392                 }
1393                 dev->video_bytesread = 0;
1394         }
1395
1396         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
1397
1398         em28xx_queue_unusedframes(dev);
1399
1400         if (count > f->buf.length)
1401                 count = f->buf.length;
1402
1403         if ((dev->video_bytesread + count) > dev->frame_size)
1404                 count = dev->frame_size - dev->video_bytesread;
1405
1406         if (copy_to_user(buf, f->bufmem+dev->video_bytesread, count)) {
1407                 em28xx_err("Error while copying to user\n");
1408                 return -EFAULT;
1409         }
1410         dev->video_bytesread += count;
1411
1412         if (dev->video_bytesread == dev->frame_size) {
1413                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1414                 list_for_each_entry(i, &dev->outqueue, frame)
1415                                     i->state = F_UNUSED;
1416                 INIT_LIST_HEAD(&dev->outqueue);
1417                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1418
1419                 em28xx_queue_unusedframes(dev);
1420                 dev->video_bytesread = 0;
1421         }
1422
1423         *f_pos += count;
1424
1425         mutex_unlock(&dev->lock);
1426
1427         return count;
1428 }
1429
1430 /*
1431  * em28xx_v4l2_poll()
1432  * will allocate buffers when called for the first time
1433  */
1434 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1435 {
1436         unsigned int mask = 0;
1437         struct em28xx_fh *fh = filp->private_data;
1438         struct em28xx *dev = fh->dev;
1439
1440         if (unlikely(res_get(fh) < 0))
1441                 return POLLERR;
1442
1443         mutex_lock(&dev->lock);
1444
1445         if (dev->state & DEV_DISCONNECTED) {
1446                 em28xx_videodbg("device not present\n");
1447         } else if (dev->state & DEV_MISCONFIGURED) {
1448                 em28xx_videodbg("device is misconfigured; close and open it again\n");
1449         } else {
1450                 if (dev->io == IO_NONE) {
1451                         if (!em28xx_request_buffers
1452                             (dev, EM28XX_NUM_READ_FRAMES)) {
1453                                 em28xx_warn
1454                                     ("poll() failed, not enough memory\n");
1455                         } else {
1456                                 dev->io = IO_READ;
1457                                 dev->stream = STREAM_ON;
1458                         }
1459                 }
1460
1461                 if (dev->io == IO_READ) {
1462                         em28xx_queue_unusedframes(dev);
1463                         poll_wait(filp, &dev->wait_frame, wait);
1464
1465                         if (!list_empty(&dev->outqueue))
1466                                 mask |= POLLIN | POLLRDNORM;
1467
1468                         mutex_unlock(&dev->lock);
1469
1470                         return mask;
1471                 }
1472         }
1473
1474         mutex_unlock(&dev->lock);
1475         return POLLERR;
1476 }
1477
1478 /*
1479  * em28xx_v4l2_mmap()
1480  */
1481 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1482 {
1483         struct em28xx_fh *fh    = filp->private_data;
1484         struct em28xx    *dev   = fh->dev;
1485         unsigned long    size   = vma->vm_end - vma->vm_start;
1486         unsigned long    start  = vma->vm_start;
1487         void             *pos;
1488         u32              i;
1489
1490         if (unlikely(res_get(fh) < 0))
1491                 return -EBUSY;
1492
1493         mutex_lock(&dev->lock);
1494
1495         if (dev->state & DEV_DISCONNECTED) {
1496                 em28xx_videodbg("mmap: device not present\n");
1497                 mutex_unlock(&dev->lock);
1498                 return -ENODEV;
1499         }
1500
1501         if (dev->state & DEV_MISCONFIGURED) {
1502                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
1503                                                 "open it again\n");
1504                 mutex_unlock(&dev->lock);
1505                 return -EIO;
1506         }
1507
1508         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE)) {
1509                 mutex_unlock(&dev->lock);
1510                 return -EINVAL;
1511         }
1512
1513         if (size > PAGE_ALIGN(dev->frame[0].buf.length))
1514                 size = PAGE_ALIGN(dev->frame[0].buf.length);
1515
1516         for (i = 0; i < dev->num_frames; i++) {
1517                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1518                         break;
1519         }
1520         if (i == dev->num_frames) {
1521                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
1522                 mutex_unlock(&dev->lock);
1523                 return -EINVAL;
1524         }
1525
1526         /* VM_IO is eventually going to replace PageReserved altogether */
1527         vma->vm_flags |= VM_IO;
1528         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
1529
1530         pos = dev->frame[i].bufmem;
1531         while (size > 0) {      /* size is page-aligned */
1532                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1533                         em28xx_videodbg("mmap: vm_insert_page failed\n");
1534                         mutex_unlock(&dev->lock);
1535                         return -EAGAIN;
1536                 }
1537                 start += PAGE_SIZE;
1538                 pos += PAGE_SIZE;
1539                 size -= PAGE_SIZE;
1540         }
1541
1542         vma->vm_ops = &em28xx_vm_ops;
1543         vma->vm_private_data = &dev->frame[i];
1544
1545         em28xx_vm_open(vma);
1546         mutex_unlock(&dev->lock);
1547         return 0;
1548 }
1549
1550 static const struct file_operations em28xx_v4l_fops = {
1551         .owner         = THIS_MODULE,
1552         .open          = em28xx_v4l2_open,
1553         .release       = em28xx_v4l2_close,
1554         .read          = em28xx_v4l2_read,
1555         .poll          = em28xx_v4l2_poll,
1556         .mmap          = em28xx_v4l2_mmap,
1557         .ioctl         = video_ioctl2,
1558         .llseek        = no_llseek,
1559         .compat_ioctl  = v4l_compat_ioctl32,
1560 };
1561
1562 static const struct video_device em28xx_video_template = {
1563         .fops                       = &em28xx_v4l_fops,
1564         .release                    = video_device_release,
1565
1566         .minor                      = -1,
1567         .vidioc_querycap            = vidioc_querycap,
1568         .vidioc_enum_fmt_cap        = vidioc_enum_fmt_cap,
1569         .vidioc_g_fmt_cap           = vidioc_g_fmt_cap,
1570         .vidioc_try_fmt_cap         = vidioc_try_fmt_cap,
1571         .vidioc_s_fmt_cap           = vidioc_s_fmt_cap,
1572         .vidioc_g_audio             = vidioc_g_audio,
1573         .vidioc_s_audio             = vidioc_s_audio,
1574         .vidioc_cropcap             = vidioc_cropcap,
1575
1576         .vidioc_g_fmt_vbi_capture   = vidioc_g_fmt_vbi_capture,
1577         .vidioc_try_fmt_vbi_capture = vidioc_try_set_vbi_capture,
1578         .vidioc_s_fmt_vbi_capture   = vidioc_try_set_vbi_capture,
1579
1580         .vidioc_reqbufs             = vidioc_reqbufs,
1581         .vidioc_querybuf            = vidioc_querybuf,
1582         .vidioc_qbuf                = vidioc_qbuf,
1583         .vidioc_dqbuf               = vidioc_dqbuf,
1584         .vidioc_s_std               = vidioc_s_std,
1585         .vidioc_enum_input          = vidioc_enum_input,
1586         .vidioc_g_input             = vidioc_g_input,
1587         .vidioc_s_input             = vidioc_s_input,
1588         .vidioc_queryctrl           = vidioc_queryctrl,
1589         .vidioc_g_ctrl              = vidioc_g_ctrl,
1590         .vidioc_s_ctrl              = vidioc_s_ctrl,
1591         .vidioc_streamon            = vidioc_streamon,
1592         .vidioc_streamoff           = vidioc_streamoff,
1593         .vidioc_g_tuner             = vidioc_g_tuner,
1594         .vidioc_s_tuner             = vidioc_s_tuner,
1595         .vidioc_g_frequency         = vidioc_g_frequency,
1596         .vidioc_s_frequency         = vidioc_s_frequency,
1597
1598         .tvnorms                    = V4L2_STD_ALL,
1599         .current_norm               = V4L2_STD_PAL,
1600 };
1601
1602 /******************************** usb interface *****************************************/
1603
1604
1605 static LIST_HEAD(em28xx_extension_devlist);
1606 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1607
1608 int em28xx_register_extension(struct em28xx_ops *ops)
1609 {
1610         struct em28xx *h, *dev = NULL;
1611
1612         list_for_each_entry(h, &em28xx_devlist, devlist)
1613                 dev = h;
1614
1615         mutex_lock(&em28xx_extension_devlist_lock);
1616         list_add_tail(&ops->next, &em28xx_extension_devlist);
1617         if (dev)
1618                 ops->init(dev);
1619
1620         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1621         mutex_unlock(&em28xx_extension_devlist_lock);
1622
1623         return 0;
1624 }
1625 EXPORT_SYMBOL(em28xx_register_extension);
1626
1627 void em28xx_unregister_extension(struct em28xx_ops *ops)
1628 {
1629         struct em28xx *h, *dev = NULL;
1630
1631         list_for_each_entry(h, &em28xx_devlist, devlist)
1632                 dev = h;
1633
1634         if (dev)
1635                 ops->fini(dev);
1636
1637         mutex_lock(&em28xx_extension_devlist_lock);
1638         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1639         list_del(&ops->next);
1640         mutex_unlock(&em28xx_extension_devlist_lock);
1641 }
1642 EXPORT_SYMBOL(em28xx_unregister_extension);
1643
1644 /*
1645  * em28xx_init_dev()
1646  * allocates and inits the device structs, registers i2c bus and v4l device
1647  */
1648 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1649                            int minor)
1650 {
1651         struct em28xx_ops *ops = NULL;
1652         struct em28xx *dev = *devhandle;
1653         int retval = -ENOMEM;
1654         int errCode;
1655         unsigned int maxh, maxw;
1656
1657         dev->udev = udev;
1658         mutex_init(&dev->lock);
1659         spin_lock_init(&dev->queue_lock);
1660         init_waitqueue_head(&dev->open);
1661         init_waitqueue_head(&dev->wait_frame);
1662         init_waitqueue_head(&dev->wait_stream);
1663
1664         dev->em28xx_write_regs = em28xx_write_regs;
1665         dev->em28xx_read_reg = em28xx_read_reg;
1666         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1667         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1668         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1669         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1670
1671         errCode = em28xx_read_reg(dev, CHIPID_REG);
1672         if (errCode >= 0)
1673                 em28xx_info("em28xx chip ID = %d\n", errCode);
1674
1675         em28xx_pre_card_setup(dev);
1676
1677         errCode = em28xx_config(dev);
1678         if (errCode) {
1679                 em28xx_errdev("error configuring device\n");
1680                 em28xx_devused &= ~(1<<dev->devno);
1681                 kfree(dev);
1682                 return -ENOMEM;
1683         }
1684
1685         /* register i2c bus */
1686         em28xx_i2c_register(dev);
1687
1688         /* Do board specific init and eeprom reading */
1689         em28xx_card_setup(dev);
1690
1691         /* configure the device */
1692         em28xx_config_i2c(dev);
1693
1694         /* set default norm */
1695         dev->norm = em28xx_video_template.current_norm;
1696
1697         maxw = norm_maxw(dev);
1698         maxh = norm_maxh(dev);
1699
1700         /* set default image size */
1701         dev->width = maxw;
1702         dev->height = maxh;
1703         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1704         dev->field_size = dev->width * dev->height;
1705         dev->frame_size =
1706             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1707         dev->bytesperline = dev->width * 2;
1708         dev->hscale = 0;
1709         dev->vscale = 0;
1710         dev->ctl_input = 2;
1711
1712         errCode = em28xx_config(dev);
1713
1714         /* allocate and fill video video_device struct */
1715         dev->vdev = video_device_alloc();
1716         if (NULL == dev->vdev) {
1717                 em28xx_errdev("cannot allocate video_device.\n");
1718                 em28xx_devused&=~(1<<dev->devno);
1719                 kfree(dev);
1720                 return -ENOMEM;
1721         }
1722         memcpy(dev->vdev, &em28xx_video_template,
1723                                         sizeof(em28xx_video_template));
1724         dev->vdev->type = VID_TYPE_CAPTURE;
1725         if (dev->has_tuner)
1726                 dev->vdev->type |= VID_TYPE_TUNER;
1727         dev->vdev->dev = &dev->udev->dev;
1728         snprintf(dev->vdev->name, sizeof(dev->vbi_dev->name),
1729                  "%s#%d %s", "em28xx", dev->devno, "video");
1730
1731         /* Allocate and fill vbi video_device struct */
1732         dev->vbi_dev = video_device_alloc();
1733         if (NULL == dev->vbi_dev) {
1734                 em28xx_errdev("cannot allocate video_device.\n");
1735                 kfree(dev->vdev);
1736                 em28xx_devused&=~(1<<dev->devno);
1737                 kfree(dev);
1738                 return -ENOMEM;
1739         }
1740         memcpy(dev->vbi_dev, &em28xx_video_template,
1741                                         sizeof(em28xx_video_template));
1742         dev->vbi_dev->type = VFL_TYPE_VBI;
1743         dev->vbi_dev->dev = &dev->udev->dev;
1744         snprintf(dev->vbi_dev->name, sizeof(dev->vbi_dev->name),
1745                                 "%s#%d %s", "em28xx", dev->devno, "vbi");
1746
1747         list_add_tail(&dev->devlist,&em28xx_devlist);
1748
1749         if (dev->has_msp34xx) {
1750                 /* Send a reset to other chips via gpio */
1751                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1752                 msleep(3);
1753                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1754                 msleep(3);
1755         }
1756
1757         video_mux(dev, 0);
1758
1759         /* register v4l2 video video_device */
1760         if ((retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1761                                          video_nr[dev->devno]))) {
1762                 em28xx_errdev("unable to register video device (error=%i).\n",
1763                               retval);
1764                 mutex_unlock(&dev->lock);
1765                 list_del(&dev->devlist);
1766                 video_device_release(dev->vdev);
1767                 em28xx_devused&=~(1<<dev->devno);
1768                 kfree(dev);
1769                 return -ENODEV;
1770         }
1771
1772         /* register v4l2 vbi video_device */
1773         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1774                                         vbi_nr[dev->devno]) < 0) {
1775                 printk("unable to register vbi device\n");
1776                 mutex_unlock(&dev->lock);
1777                 list_del(&dev->devlist);
1778                 video_device_release(dev->vbi_dev);
1779                 video_device_release(dev->vdev);
1780                 em28xx_devused&=~(1<<dev->devno);
1781                 kfree(dev);
1782                 return -ENODEV;
1783         }
1784
1785         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1786                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1787                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1788
1789         mutex_lock(&em28xx_extension_devlist_lock);
1790         if (!list_empty(&em28xx_extension_devlist)) {
1791                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1792                         if (ops->id)
1793                                 ops->init(dev);
1794                 }
1795         }
1796         mutex_unlock(&em28xx_extension_devlist_lock);
1797
1798         return 0;
1799 }
1800
1801 #if defined(CONFIG_MODULES) && defined(MODULE)
1802 static void request_module_async(struct work_struct *work)
1803 {
1804         struct em28xx *dev = container_of(work,
1805                              struct em28xx, request_module_wk);
1806
1807         if (!dev->has_audio_class)
1808                 request_module("em28xx-alsa");
1809 }
1810
1811 static void request_modules(struct em28xx *dev)
1812 {
1813         INIT_WORK(&dev->request_module_wk, request_module_async);
1814         schedule_work(&dev->request_module_wk);
1815 }
1816 #else
1817 #define request_modules(dev)
1818 #endif /* CONFIG_MODULES */
1819
1820 /*
1821  * em28xx_usb_probe()
1822  * checks for supported devices
1823  */
1824 static int em28xx_usb_probe(struct usb_interface *interface,
1825                             const struct usb_device_id *id)
1826 {
1827         const struct usb_endpoint_descriptor *endpoint;
1828         struct usb_device *udev;
1829         struct usb_interface *uif;
1830         struct em28xx *dev = NULL;
1831         int retval = -ENODEV;
1832         int i, nr, ifnum;
1833
1834         udev = usb_get_dev(interface_to_usbdev(interface));
1835         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
1836
1837         /* Check to see next free device and mark as used */
1838         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
1839         em28xx_devused|=1<<nr;
1840
1841         /* Don't register audio interfaces */
1842         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1843                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
1844                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
1845                                 ifnum,
1846                                 interface->altsetting[0].desc.bInterfaceClass);
1847
1848                 em28xx_devused&=~(1<<nr);
1849                 return -ENODEV;
1850         }
1851
1852         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
1853                         udev->descriptor.idVendor,udev->descriptor.idProduct,
1854                         ifnum,
1855                         interface->altsetting[0].desc.bInterfaceClass);
1856
1857         endpoint = &interface->cur_altsetting->endpoint[1].desc;
1858
1859         /* check if the device has the iso in endpoint at the correct place */
1860         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1861             USB_ENDPOINT_XFER_ISOC) {
1862                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
1863                 em28xx_devused&=~(1<<nr);
1864                 return -ENODEV;
1865         }
1866         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
1867                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
1868                 em28xx_devused&=~(1<<nr);
1869                 return -ENODEV;
1870         }
1871
1872         if (nr >= EM28XX_MAXBOARDS) {
1873                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
1874                 em28xx_devused&=~(1<<nr);
1875                 return -ENOMEM;
1876         }
1877
1878         /* allocate memory for our device state and initialize it */
1879         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1880         if (dev == NULL) {
1881                 em28xx_err(DRIVER_NAME ": out of memory!\n");
1882                 em28xx_devused&=~(1<<nr);
1883                 return -ENOMEM;
1884         }
1885
1886         snprintf(dev->name, 29, "em28xx #%d", nr);
1887         dev->devno = nr;
1888         dev->model = id->driver_info;
1889
1890         /* Checks if audio is provided by some interface */
1891         for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
1892                 uif = udev->config->interface[i];
1893                 if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
1894                         dev->has_audio_class = 1;
1895                         break;
1896                 }
1897         }
1898
1899         printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
1900                    dev->has_audio_class ? "Has" : "Doesn't have");
1901
1902         /* compute alternate max packet sizes */
1903         uif = udev->actconfig->interface[0];
1904
1905         dev->num_alt=uif->num_altsetting;
1906         em28xx_info("Alternate settings: %i\n",dev->num_alt);
1907 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
1908         dev->alt_max_pkt_size = kmalloc(32*
1909                                                 dev->num_alt,GFP_KERNEL);
1910         if (dev->alt_max_pkt_size == NULL) {
1911                 em28xx_errdev("out of memory!\n");
1912                 em28xx_devused&=~(1<<nr);
1913                 kfree(dev);
1914                 return -ENOMEM;
1915         }
1916
1917         for (i = 0; i < dev->num_alt ; i++) {
1918                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
1919                                                         wMaxPacketSize);
1920                 dev->alt_max_pkt_size[i] =
1921                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
1922                 em28xx_info("Alternate setting %i, max size= %i\n",i,
1923                                                         dev->alt_max_pkt_size[i]);
1924         }
1925
1926         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
1927                 dev->model = card[nr];
1928
1929         /* allocate device struct */
1930         retval = em28xx_init_dev(&dev, udev, nr);
1931         if (retval)
1932                 return retval;
1933
1934         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
1935
1936         /* save our data pointer in this interface device */
1937         usb_set_intfdata(interface, dev);
1938
1939         request_modules(dev);
1940
1941         return 0;
1942 }
1943
1944 /*
1945  * em28xx_usb_disconnect()
1946  * called when the device gets diconencted
1947  * video device will be unregistered on v4l2_close in case it is still open
1948  */
1949 static void em28xx_usb_disconnect(struct usb_interface *interface)
1950 {
1951         struct em28xx *dev;
1952         struct em28xx_ops *ops = NULL;
1953
1954         dev = usb_get_intfdata(interface);
1955         usb_set_intfdata(interface, NULL);
1956
1957         if (!dev)
1958                 return;
1959
1960         em28xx_info("disconnecting %s\n", dev->vdev->name);
1961
1962         /* wait until all current v4l2 io is finished then deallocate resources */
1963         mutex_lock(&dev->lock);
1964
1965         wake_up_interruptible_all(&dev->open);
1966
1967         if (dev->users) {
1968                 em28xx_warn
1969                     ("device /dev/video%d is open! Deregistration and memory "
1970                      "deallocation are deferred on close.\n",
1971                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
1972
1973                 dev->state |= DEV_MISCONFIGURED;
1974                 em28xx_uninit_isoc(dev);
1975                 dev->state |= DEV_DISCONNECTED;
1976                 wake_up_interruptible(&dev->wait_frame);
1977                 wake_up_interruptible(&dev->wait_stream);
1978         } else {
1979                 dev->state |= DEV_DISCONNECTED;
1980                 em28xx_release_resources(dev);
1981         }
1982         mutex_unlock(&dev->lock);
1983
1984         mutex_lock(&em28xx_extension_devlist_lock);
1985         if (!list_empty(&em28xx_extension_devlist)) {
1986                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1987                         ops->fini(dev);
1988                 }
1989         }
1990         mutex_unlock(&em28xx_extension_devlist_lock);
1991
1992         if (!dev->users) {
1993                 kfree(dev->alt_max_pkt_size);
1994                 kfree(dev);
1995         }
1996 }
1997
1998 static struct usb_driver em28xx_usb_driver = {
1999         .name = "em28xx",
2000         .probe = em28xx_usb_probe,
2001         .disconnect = em28xx_usb_disconnect,
2002         .id_table = em28xx_id_table,
2003 };
2004
2005 static int __init em28xx_module_init(void)
2006 {
2007         int result;
2008
2009         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
2010                (EM28XX_VERSION_CODE >> 16) & 0xff,
2011                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
2012 #ifdef SNAPSHOT
2013         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
2014                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
2015 #endif
2016
2017         /* register this driver with the USB subsystem */
2018         result = usb_register(&em28xx_usb_driver);
2019         if (result)
2020                 em28xx_err(DRIVER_NAME
2021                            " usb_register failed. Error number %d.\n", result);
2022
2023         return result;
2024 }
2025
2026 static void __exit em28xx_module_exit(void)
2027 {
2028         /* deregister this driver with the USB subsystem */
2029         usb_deregister(&em28xx_usb_driver);
2030 }
2031
2032 module_init(em28xx_module_init);
2033 module_exit(em28xx_module_exit);