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 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  66
  67 module_param_array(card,  int, NULL, 0444);
  68 module_param_array(video_nr, int, NULL, 0444);
  69 module_param_array(vbi_nr, int, NULL, 0444);
  70 module_param_array(radio_nr, int, NULL, 0444);
  71 MODULE_PARM_DESC(card,     "card type");
  72 MODULE_PARM_DESC(video_nr, "video device numbers");
  73 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
  74 MODULE_PARM_DESC(radio_nr, "radio device numbers");
  75
  76 static unsigned int video_debug = 0;
  77 module_param(video_debug,int,0644);
  78 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  79
  80 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  81 static unsigned long em28xx_devused;
  82
  83 /* supported controls */
  84 /* Common to all boards */
  85 static struct v4l2_queryctrl em28xx_qctrl[] = {
  86         {
  87                 .id = V4L2_CID_AUDIO_VOLUME,
  88                 .type = V4L2_CTRL_TYPE_INTEGER,
  89                 .name = "Volume",
  90                 .minimum = 0x0,
  91                 .maximum = 0x1f,
  92                 .step = 0x1,
  93                 .default_value = 0x1f,
  94                 .flags = 0,
  95         },{
  96                 .id = V4L2_CID_AUDIO_MUTE,
  97                 .type = V4L2_CTRL_TYPE_BOOLEAN,
  98                 .name = "Mute",
  99                 .minimum = 0,
 100                 .maximum = 1,
 101                 .step = 1,
 102                 .default_value = 1,
 103                 .flags = 0,
 104         }
 105 };
 106
 107 static struct usb_driver em28xx_usb_driver;
 108
 109
 110 /*********************  v4l2 interface  ******************************************/
 111
 112 /*
 113  * em28xx_config()
 114  * inits registers with sane defaults
 115  */
 116 static int em28xx_config(struct em28xx *dev)
 117 {
 118
 119         /* Sets I2C speed to 100 KHz */
 120         if (!dev->is_em2800)
 121                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 122
 123         /* enable vbi capturing */
 124
 125 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 126 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 127         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 128
 129         dev->mute = 1;          /* maybe not the right place... */
 130         dev->volume = 0x1f;
 131
 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 = fh->radio ? V4L2_TUNER_RADIO : 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 (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
 819                 return -EINVAL;
 820         if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
 821                 return -EINVAL;
 822
 823         mutex_lock(&dev->lock);
 824
 825         dev->ctl_freq = f->frequency;
 826         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
 827
 828         mutex_unlock(&dev->lock);
 829         return 0;
 830 }
 831
 832 static int vidioc_cropcap(struct file *file, void *priv,
 833                                         struct v4l2_cropcap *cc)
 834 {
 835         struct em28xx_fh      *fh  = priv;
 836         struct em28xx         *dev = fh->dev;
 837
 838         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 839                 return -EINVAL;
 840
 841         cc->bounds.left = 0;
 842         cc->bounds.top = 0;
 843         cc->bounds.width = dev->width;
 844         cc->bounds.height = dev->height;
 845         cc->defrect = cc->bounds;
 846         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
 847         cc->pixelaspect.denominator = 59;
 848
 849         return 0;
 850 }
 851
 852 static int vidioc_streamon(struct file *file, void *priv,
 853                                         enum v4l2_buf_type type)
 854 {
 855         struct em28xx_fh      *fh  = priv;
 856         struct em28xx         *dev = fh->dev;
 857         int                   rc;
 858
 859         rc = check_dev(dev);
 860         if (rc < 0)
 861                 return rc;
 862
 863         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 864                 return -EINVAL;
 865
 866         if (list_empty(&dev->inqueue))
 867                 return -EINVAL;
 868
 869         mutex_lock(&dev->lock);
 870
 871         if (unlikely(res_get(fh) < 0)) {
 872                 mutex_unlock(&dev->lock);
 873                 return -EBUSY;
 874         }
 875
 876         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
 877
 878         mutex_unlock(&dev->lock);
 879         return 0;
 880 }
 881
 882 static int vidioc_streamoff(struct file *file, void *priv,
 883                                         enum v4l2_buf_type type)
 884 {
 885         struct em28xx_fh      *fh  = priv;
 886         struct em28xx         *dev = fh->dev;
 887         int                   rc;
 888
 889         rc = check_dev(dev);
 890         if (rc < 0)
 891                 return rc;
 892
 893         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 894                 return -EINVAL;
 895
 896         mutex_lock(&dev->lock);
 897
 898         if (dev->stream == STREAM_ON) {
 899                 em28xx_videodbg("VIDIOC_STREAMOFF: interrupting stream\n");
 900                 rc = em28xx_stream_interrupt(dev);
 901                 if (rc < 0) {
 902                         mutex_unlock(&dev->lock);
 903                         return rc;
 904                 }
 905         }
 906
 907         em28xx_empty_framequeues(dev);
 908
 909         mutex_unlock(&dev->lock);
 910         return 0;
 911 }
 912
 913 static int vidioc_querycap(struct file *file, void  *priv,
 914                                         struct v4l2_capability *cap)
 915 {
 916         struct em28xx_fh      *fh  = priv;
 917         struct em28xx         *dev = fh->dev;
 918
 919         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
 920         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
 921         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
 922
 923         cap->version = EM28XX_VERSION_CODE;
 924
 925         cap->capabilities =
 926                         V4L2_CAP_SLICED_VBI_CAPTURE |
 927                         V4L2_CAP_VIDEO_CAPTURE |
 928                         V4L2_CAP_AUDIO |
 929                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 930
 931         if (dev->has_tuner)
 932                 cap->capabilities |= V4L2_CAP_TUNER;
 933
 934         return 0;
 935 }
 936
 937 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
 938                                         struct v4l2_fmtdesc *fmtd)
 939 {
 940         if (fmtd->index != 0)
 941                 return -EINVAL;
 942
 943         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 944         strcpy(fmtd->description, "Packed YUY2");
 945         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 946         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
 947
 948         return 0;
 949 }
 950
 951 /* Sliced VBI ioctls */
 952 static int vidioc_g_fmt_vbi_capture(struct file *file, void *priv,
 953                                         struct v4l2_format *f)
 954 {
 955         struct em28xx_fh      *fh  = priv;
 956         struct em28xx         *dev = fh->dev;
 957         int                   rc;
 958
 959         rc = check_dev(dev);
 960         if (rc < 0)
 961                 return rc;
 962
 963         mutex_lock(&dev->lock);
 964
 965         f->fmt.sliced.service_set = 0;
 966
 967         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 968
 969         if (f->fmt.sliced.service_set == 0)
 970                 rc = -EINVAL;
 971
 972         mutex_unlock(&dev->lock);
 973         return rc;
 974 }
 975
 976 static int vidioc_try_set_vbi_capture(struct file *file, void *priv,
 977                         struct v4l2_format *f)
 978 {
 979         struct em28xx_fh      *fh  = priv;
 980         struct em28xx         *dev = fh->dev;
 981         int                   rc;
 982
 983         rc = check_dev(dev);
 984         if (rc < 0)
 985                 return rc;
 986
 987         mutex_lock(&dev->lock);
 988         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 989         mutex_unlock(&dev->lock);
 990
 991         if (f->fmt.sliced.service_set == 0)
 992                 return -EINVAL;
 993
 994         return 0;
 995 }
 996
 997
 998 static int vidioc_reqbufs(struct file *file, void *priv,
 999                           struct v4l2_requestbuffers *rb)
1000 {
1001         struct em28xx_fh      *fh  = priv;
1002         struct em28xx         *dev = fh->dev;
1003         u32                   i;
1004         int                   rc;
1005
1006         rc = check_dev(dev);
1007         if (rc < 0)
1008                 return rc;
1009
1010         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1011                 rb->memory != V4L2_MEMORY_MMAP)
1012                 return -EINVAL;
1013
1014         if (dev->io == IO_READ) {
1015                 em28xx_videodbg("method is set to read;"
1016                                 " close and open the device again to"
1017                                 " choose the mmap I/O method\n");
1018                 return -EINVAL;
1019         }
1020
1021         for (i = 0; i < dev->num_frames; i++)
1022                 if (dev->frame[i].vma_use_count) {
1023                         em28xx_videodbg("VIDIOC_REQBUFS failed; "
1024                                         "previous buffers are still mapped\n");
1025                         return -EINVAL;
1026                 }
1027
1028         mutex_lock(&dev->lock);
1029
1030         if (dev->stream == STREAM_ON) {
1031                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1032                 rc = em28xx_stream_interrupt(dev);
1033                 if (rc < 0) {
1034                         mutex_unlock(&dev->lock);
1035                         return rc;
1036                 }
1037         }
1038
1039         em28xx_empty_framequeues(dev);
1040
1041         em28xx_release_buffers(dev);
1042         if (rb->count)
1043                 rb->count = em28xx_request_buffers(dev, rb->count);
1044
1045         dev->frame_current = NULL;
1046         dev->io = rb->count ? IO_MMAP : IO_NONE;
1047
1048         mutex_unlock(&dev->lock);
1049         return 0;
1050 }
1051
1052 static int vidioc_querybuf(struct file *file, void *priv,
1053                            struct v4l2_buffer *b)
1054 {
1055         struct em28xx_fh      *fh  = priv;
1056         struct em28xx         *dev = fh->dev;
1057         int                   rc;
1058
1059         rc = check_dev(dev);
1060         if (rc < 0)
1061                 return rc;
1062
1063         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1064                 b->index >= dev->num_frames || dev->io != IO_MMAP)
1065                 return -EINVAL;
1066
1067         mutex_lock(&dev->lock);
1068
1069         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1070
1071         if (dev->frame[b->index].vma_use_count)
1072                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1073
1074         if (dev->frame[b->index].state == F_DONE)
1075                 b->flags |= V4L2_BUF_FLAG_DONE;
1076         else if (dev->frame[b->index].state != F_UNUSED)
1077                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1078
1079         mutex_unlock(&dev->lock);
1080         return 0;
1081 }
1082
1083 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1084 {
1085         struct em28xx_fh      *fh  = priv;
1086         struct em28xx         *dev = fh->dev;
1087         unsigned long         lock_flags;
1088         int                   rc;
1089
1090         rc = check_dev(dev);
1091         if (rc < 0)
1092                 return rc;
1093
1094         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE  || dev->io != IO_MMAP ||
1095                                                 b->index >= dev->num_frames)
1096                 return -EINVAL;
1097
1098         if (dev->frame[b->index].state != F_UNUSED)
1099                 return -EAGAIN;
1100
1101         dev->frame[b->index].state = F_QUEUED;
1102
1103         /* add frame to fifo */
1104         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1105         list_add_tail(&dev->frame[b->index].frame, &dev->inqueue);
1106         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1107
1108         return 0;
1109 }
1110
1111 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1112 {
1113         struct em28xx_fh      *fh  = priv;
1114         struct em28xx         *dev = fh->dev;
1115         int                   rc;
1116         struct em28xx_frame_t *f;
1117         unsigned long         lock_flags;
1118
1119         rc = check_dev(dev);
1120         if (rc < 0)
1121                 return rc;
1122
1123         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
1124                 return -EINVAL;
1125
1126         if (list_empty(&dev->outqueue)) {
1127                 if (dev->stream == STREAM_OFF)
1128                         return -EINVAL;
1129
1130                 if (file->f_flags & O_NONBLOCK)
1131                         return -EAGAIN;
1132
1133                 rc = wait_event_interruptible(dev->wait_frame,
1134                                         (!list_empty(&dev->outqueue)) ||
1135                                         (dev->state & DEV_DISCONNECTED));
1136                 if (rc)
1137                         return rc;
1138
1139                 if (dev->state & DEV_DISCONNECTED)
1140                         return -ENODEV;
1141         }
1142
1143         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1144         f = list_entry(dev->outqueue.next, struct em28xx_frame_t, frame);
1145         list_del(dev->outqueue.next);
1146         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1147
1148         f->state = F_UNUSED;
1149         memcpy(b, &f->buf, sizeof(*b));
1150
1151         if (f->vma_use_count)
1152                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1153
1154         return 0;
1155 }
1156
1157 /* ----------------------------------------------------------- */
1158 /* RADIO ESPECIFIC IOCTLS                                      */
1159 /* ----------------------------------------------------------- */
1160
1161 static int radio_querycap(struct file *file, void  *priv,
1162                           struct v4l2_capability *cap)
1163 {
1164         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1165
1166         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1167         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1168         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1169
1170         cap->version = EM28XX_VERSION_CODE;
1171         cap->capabilities = V4L2_CAP_TUNER;
1172         return 0;
1173 }
1174
1175 static int radio_g_tuner(struct file *file, void *priv,
1176                          struct v4l2_tuner *t)
1177 {
1178         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1179
1180         if (unlikely(t->index > 0))
1181                 return -EINVAL;
1182
1183         strcpy(t->name, "Radio");
1184         t->type = V4L2_TUNER_RADIO;
1185
1186         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1187         return 0;
1188 }
1189
1190 static int radio_enum_input(struct file *file, void *priv,
1191                             struct v4l2_input *i)
1192 {
1193         if (i->index != 0)
1194                 return -EINVAL;
1195         strcpy(i->name, "Radio");
1196         i->type = V4L2_INPUT_TYPE_TUNER;
1197
1198         return 0;
1199 }
1200
1201 static int radio_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1202 {
1203         if (unlikely(a->index))
1204                 return -EINVAL;
1205
1206         strcpy(a->name, "Radio");
1207         return 0;
1208 }
1209
1210 static int radio_s_tuner(struct file *file, void *priv,
1211                          struct v4l2_tuner *t)
1212 {
1213         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1214
1215         if (0 != t->index)
1216                 return -EINVAL;
1217
1218         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1219
1220         return 0;
1221 }
1222
1223 static int radio_s_audio(struct file *file, void *fh,
1224                          struct v4l2_audio *a)
1225 {
1226         return 0;
1227 }
1228
1229 static int radio_s_input(struct file *file, void *fh, unsigned int i)
1230 {
1231         return 0;
1232 }
1233
1234 static int radio_queryctrl(struct file *file, void *priv,
1235                            struct v4l2_queryctrl *qc)
1236 {
1237         int i;
1238
1239         if (qc->id <  V4L2_CID_BASE ||
1240                 qc->id >= V4L2_CID_LASTP1)
1241                 return -EINVAL;
1242
1243         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1244                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1245                         memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
1246                         return 0;
1247                 }
1248         }
1249
1250         return -EINVAL;
1251 }
1252
1253 /*
1254  * em28xx_v4l2_open()
1255  * inits the device and starts isoc transfer
1256  */
1257 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1258 {
1259         int minor = iminor(inode);
1260         int errCode = 0, radio = 0;
1261         struct em28xx *h,*dev = NULL;
1262         struct em28xx_fh *fh;
1263
1264         list_for_each_entry(h, &em28xx_devlist, devlist) {
1265                 if (h->vdev->minor == minor) {
1266                         dev  = h;
1267                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1268                 }
1269                 if (h->vbi_dev->minor == minor) {
1270                         dev  = h;
1271                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1272                 }
1273                 if (h->radio_dev &&
1274                     h->radio_dev->minor == minor) {
1275                         radio = 1;
1276                         dev   = h;
1277                 }
1278         }
1279         if (NULL == dev)
1280                 return -ENODEV;
1281
1282         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1283                                 minor,v4l2_type_names[dev->type],dev->users);
1284
1285         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1286
1287         if (!fh) {
1288                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1289                 return -ENOMEM;
1290         }
1291         mutex_lock(&dev->lock);
1292         fh->dev = dev;
1293         fh->radio = radio;
1294         filp->private_data = fh;
1295
1296         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1297                 em28xx_set_alternate(dev);
1298
1299                 dev->width = norm_maxw(dev);
1300                 dev->height = norm_maxh(dev);
1301                 dev->frame_size = dev->width * dev->height * 2;
1302                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1303                 dev->bytesperline = dev->width * 2;
1304                 dev->hscale = 0;
1305                 dev->vscale = 0;
1306
1307                 em28xx_capture_start(dev, 1);
1308                 em28xx_resolution_set(dev);
1309
1310
1311                 /* start the transfer */
1312                 errCode = em28xx_init_isoc(dev);
1313                 if (errCode)
1314                         goto err;
1315
1316                 em28xx_empty_framequeues(dev);
1317         }
1318         if (fh->radio) {
1319                 em28xx_videodbg("video_open: setting radio device\n");
1320                 em28xx_i2c_call_clients(dev, AUDC_SET_RADIO, NULL);
1321         }
1322
1323         dev->users++;
1324
1325 err:
1326         mutex_unlock(&dev->lock);
1327         return errCode;
1328 }
1329
1330 /*
1331  * em28xx_realease_resources()
1332  * unregisters the v4l2,i2c and usb devices
1333  * called when the device gets disconected or at module unload
1334 */
1335 static void em28xx_release_resources(struct em28xx *dev)
1336 {
1337
1338         /*FIXME: I2C IR should be disconnected */
1339
1340         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1341                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1342                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1343         list_del(&dev->devlist);
1344         if (dev->radio_dev) {
1345                 if (-1 != dev->radio_dev->minor)
1346                         video_unregister_device(dev->radio_dev);
1347                 else
1348                         video_device_release(dev->radio_dev);
1349                 dev->radio_dev = NULL;
1350         }
1351         if (dev->vbi_dev) {
1352                 if (-1 != dev->vbi_dev->minor)
1353                         video_unregister_device(dev->vbi_dev);
1354                 else
1355                         video_device_release(dev->vbi_dev);
1356                 dev->vbi_dev = NULL;
1357         }
1358         if (dev->vdev) {
1359                 if (-1 != dev->vdev->minor)
1360                         video_unregister_device(dev->vdev);
1361                 else
1362                         video_device_release(dev->vdev);
1363                 dev->vdev = NULL;
1364         }
1365         em28xx_i2c_unregister(dev);
1366         usb_put_dev(dev->udev);
1367
1368         /* Mark device as unused */
1369         em28xx_devused&=~(1<<dev->devno);
1370 }
1371
1372 /*
1373  * em28xx_v4l2_close()
1374  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
1375  */
1376 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1377 {
1378         struct em28xx_fh *fh  = filp->private_data;
1379         struct em28xx    *dev = fh->dev;
1380         int              errCode;
1381
1382         em28xx_videodbg("users=%d\n", dev->users);
1383
1384
1385         if (res_check(fh))
1386                 res_free(fh);
1387
1388         mutex_lock(&dev->lock);
1389
1390         if (dev->users == 1) {
1391                 em28xx_uninit_isoc(dev);
1392                 em28xx_release_buffers(dev);
1393                 dev->io = IO_NONE;
1394
1395                 /* the device is already disconnect,
1396                    free the remaining resources */
1397                 if (dev->state & DEV_DISCONNECTED) {
1398                         em28xx_release_resources(dev);
1399                         mutex_unlock(&dev->lock);
1400                         kfree(dev);
1401                         return 0;
1402                 }
1403
1404                 /* set alternate 0 */
1405                 dev->alt = 0;
1406                 em28xx_videodbg("setting alternate 0\n");
1407                 errCode = usb_set_interface(dev->udev, 0, 0);
1408                 if (errCode < 0) {
1409                         em28xx_errdev("cannot change alternate number to "
1410                                         "0 (error=%i)\n", errCode);
1411                 }
1412         }
1413         kfree(fh);
1414         dev->users--;
1415         wake_up_interruptible_nr(&dev->open, 1);
1416         mutex_unlock(&dev->lock);
1417         return 0;
1418 }
1419
1420 /*
1421  * em28xx_v4l2_read()
1422  * will allocate buffers when called for the first time
1423  */
1424 static ssize_t
1425 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
1426                  loff_t * f_pos)
1427 {
1428         struct em28xx_frame_t *f, *i;
1429         unsigned long lock_flags;
1430         int ret = 0;
1431         struct em28xx_fh *fh = filp->private_data;
1432         struct em28xx *dev = fh->dev;
1433
1434         /* FIXME: read() is not prepared to allow changing the video
1435            resolution while streaming. Seems a bug at em28xx_set_fmt
1436          */
1437
1438         if (unlikely(res_get(fh) < 0))
1439                 return -EBUSY;
1440
1441         mutex_lock(&dev->lock);
1442
1443         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1444                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
1445
1446         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
1447                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
1448                 em28xx_videodbg("not supported yet! ...\n");
1449                 if (copy_to_user(buf, "", 1)) {
1450                         mutex_unlock(&dev->lock);
1451                         return -EFAULT;
1452                 }
1453                 mutex_unlock(&dev->lock);
1454                 return (1);
1455         }
1456         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
1457                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
1458                 em28xx_videodbg("not supported yet! ...\n");
1459                 if (copy_to_user(buf, "", 1)) {
1460                         mutex_unlock(&dev->lock);
1461                         return -EFAULT;
1462                 }
1463                 mutex_unlock(&dev->lock);
1464                 return (1);
1465         }
1466
1467         if (dev->state & DEV_DISCONNECTED) {
1468                 em28xx_videodbg("device not present\n");
1469                 mutex_unlock(&dev->lock);
1470                 return -ENODEV;
1471         }
1472
1473         if (dev->state & DEV_MISCONFIGURED) {
1474                 em28xx_videodbg("device misconfigured; close and open it again\n");
1475                 mutex_unlock(&dev->lock);
1476                 return -EIO;
1477         }
1478
1479         if (dev->io == IO_MMAP) {
1480                 em28xx_videodbg ("IO method is set to mmap; close and open"
1481                                 " the device again to choose the read method\n");
1482                 mutex_unlock(&dev->lock);
1483                 return -EINVAL;
1484         }
1485
1486         if (dev->io == IO_NONE) {
1487                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
1488                         em28xx_errdev("read failed, not enough memory\n");
1489                         mutex_unlock(&dev->lock);
1490                         return -ENOMEM;
1491                 }
1492                 dev->io = IO_READ;
1493                 dev->stream = STREAM_ON;
1494                 em28xx_queue_unusedframes(dev);
1495         }
1496
1497         if (!count) {
1498                 mutex_unlock(&dev->lock);
1499                 return 0;
1500         }
1501
1502         if (list_empty(&dev->outqueue)) {
1503                 if (filp->f_flags & O_NONBLOCK) {
1504                         mutex_unlock(&dev->lock);
1505                         return -EAGAIN;
1506                 }
1507                 ret = wait_event_interruptible
1508                     (dev->wait_frame,
1509                      (!list_empty(&dev->outqueue)) ||
1510                      (dev->state & DEV_DISCONNECTED));
1511                 if (ret) {
1512                         mutex_unlock(&dev->lock);
1513                         return ret;
1514                 }
1515                 if (dev->state & DEV_DISCONNECTED) {
1516                         mutex_unlock(&dev->lock);
1517                         return -ENODEV;
1518                 }
1519                 dev->video_bytesread = 0;
1520         }
1521
1522         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
1523
1524         em28xx_queue_unusedframes(dev);
1525
1526         if (count > f->buf.length)
1527                 count = f->buf.length;
1528
1529         if ((dev->video_bytesread + count) > dev->frame_size)
1530                 count = dev->frame_size - dev->video_bytesread;
1531
1532         if (copy_to_user(buf, f->bufmem+dev->video_bytesread, count)) {
1533                 em28xx_err("Error while copying to user\n");
1534                 return -EFAULT;
1535         }
1536         dev->video_bytesread += count;
1537
1538         if (dev->video_bytesread == dev->frame_size) {
1539                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1540                 list_for_each_entry(i, &dev->outqueue, frame)
1541                                     i->state = F_UNUSED;
1542                 INIT_LIST_HEAD(&dev->outqueue);
1543                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1544
1545                 em28xx_queue_unusedframes(dev);
1546                 dev->video_bytesread = 0;
1547         }
1548
1549         *f_pos += count;
1550
1551         mutex_unlock(&dev->lock);
1552
1553         return count;
1554 }
1555
1556 /*
1557  * em28xx_v4l2_poll()
1558  * will allocate buffers when called for the first time
1559  */
1560 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1561 {
1562         unsigned int mask = 0;
1563         struct em28xx_fh *fh = filp->private_data;
1564         struct em28xx *dev = fh->dev;
1565
1566         if (unlikely(res_get(fh) < 0))
1567                 return POLLERR;
1568
1569         mutex_lock(&dev->lock);
1570
1571         if (dev->state & DEV_DISCONNECTED) {
1572                 em28xx_videodbg("device not present\n");
1573         } else if (dev->state & DEV_MISCONFIGURED) {
1574                 em28xx_videodbg("device is misconfigured; close and open it again\n");
1575         } else {
1576                 if (dev->io == IO_NONE) {
1577                         if (!em28xx_request_buffers
1578                             (dev, EM28XX_NUM_READ_FRAMES)) {
1579                                 em28xx_warn
1580                                     ("poll() failed, not enough memory\n");
1581                         } else {
1582                                 dev->io = IO_READ;
1583                                 dev->stream = STREAM_ON;
1584                         }
1585                 }
1586
1587                 if (dev->io == IO_READ) {
1588                         em28xx_queue_unusedframes(dev);
1589                         poll_wait(filp, &dev->wait_frame, wait);
1590
1591                         if (!list_empty(&dev->outqueue))
1592                                 mask |= POLLIN | POLLRDNORM;
1593
1594                         mutex_unlock(&dev->lock);
1595
1596                         return mask;
1597                 }
1598         }
1599
1600         mutex_unlock(&dev->lock);
1601         return POLLERR;
1602 }
1603
1604 /*
1605  * em28xx_v4l2_mmap()
1606  */
1607 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1608 {
1609         struct em28xx_fh *fh    = filp->private_data;
1610         struct em28xx    *dev   = fh->dev;
1611         unsigned long    size   = vma->vm_end - vma->vm_start;
1612         unsigned long    start  = vma->vm_start;
1613         void             *pos;
1614         u32              i;
1615
1616         if (unlikely(res_get(fh) < 0))
1617                 return -EBUSY;
1618
1619         mutex_lock(&dev->lock);
1620
1621         if (dev->state & DEV_DISCONNECTED) {
1622                 em28xx_videodbg("mmap: device not present\n");
1623                 mutex_unlock(&dev->lock);
1624                 return -ENODEV;
1625         }
1626
1627         if (dev->state & DEV_MISCONFIGURED) {
1628                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
1629                                                 "open it again\n");
1630                 mutex_unlock(&dev->lock);
1631                 return -EIO;
1632         }
1633
1634         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE)) {
1635                 mutex_unlock(&dev->lock);
1636                 return -EINVAL;
1637         }
1638
1639         if (size > PAGE_ALIGN(dev->frame[0].buf.length))
1640                 size = PAGE_ALIGN(dev->frame[0].buf.length);
1641
1642         for (i = 0; i < dev->num_frames; i++) {
1643                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1644                         break;
1645         }
1646         if (i == dev->num_frames) {
1647                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
1648                 mutex_unlock(&dev->lock);
1649                 return -EINVAL;
1650         }
1651
1652         /* VM_IO is eventually going to replace PageReserved altogether */
1653         vma->vm_flags |= VM_IO;
1654         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
1655
1656         pos = dev->frame[i].bufmem;
1657         while (size > 0) {      /* size is page-aligned */
1658                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1659                         em28xx_videodbg("mmap: vm_insert_page failed\n");
1660                         mutex_unlock(&dev->lock);
1661                         return -EAGAIN;
1662                 }
1663                 start += PAGE_SIZE;
1664                 pos += PAGE_SIZE;
1665                 size -= PAGE_SIZE;
1666         }
1667
1668         vma->vm_ops = &em28xx_vm_ops;
1669         vma->vm_private_data = &dev->frame[i];
1670
1671         em28xx_vm_open(vma);
1672         mutex_unlock(&dev->lock);
1673         return 0;
1674 }
1675
1676 static const struct file_operations em28xx_v4l_fops = {
1677         .owner         = THIS_MODULE,
1678         .open          = em28xx_v4l2_open,
1679         .release       = em28xx_v4l2_close,
1680         .read          = em28xx_v4l2_read,
1681         .poll          = em28xx_v4l2_poll,
1682         .mmap          = em28xx_v4l2_mmap,
1683         .ioctl         = video_ioctl2,
1684         .llseek        = no_llseek,
1685         .compat_ioctl  = v4l_compat_ioctl32,
1686 };
1687
1688 static const struct file_operations radio_fops = {
1689         .owner         = THIS_MODULE,
1690         .open          = em28xx_v4l2_open,
1691         .release       = em28xx_v4l2_close,
1692         .ioctl         = video_ioctl2,
1693         .compat_ioctl  = v4l_compat_ioctl32,
1694         .llseek        = no_llseek,
1695 };
1696
1697 static const struct video_device em28xx_video_template = {
1698         .fops                       = &em28xx_v4l_fops,
1699         .release                    = video_device_release,
1700
1701         .minor                      = -1,
1702         .vidioc_querycap            = vidioc_querycap,
1703         .vidioc_enum_fmt_cap        = vidioc_enum_fmt_cap,
1704         .vidioc_g_fmt_cap           = vidioc_g_fmt_cap,
1705         .vidioc_try_fmt_cap         = vidioc_try_fmt_cap,
1706         .vidioc_s_fmt_cap           = vidioc_s_fmt_cap,
1707         .vidioc_g_audio             = vidioc_g_audio,
1708         .vidioc_s_audio             = vidioc_s_audio,
1709         .vidioc_cropcap             = vidioc_cropcap,
1710
1711         .vidioc_g_fmt_vbi_capture   = vidioc_g_fmt_vbi_capture,
1712         .vidioc_try_fmt_vbi_capture = vidioc_try_set_vbi_capture,
1713         .vidioc_s_fmt_vbi_capture   = vidioc_try_set_vbi_capture,
1714
1715         .vidioc_reqbufs             = vidioc_reqbufs,
1716         .vidioc_querybuf            = vidioc_querybuf,
1717         .vidioc_qbuf                = vidioc_qbuf,
1718         .vidioc_dqbuf               = vidioc_dqbuf,
1719         .vidioc_s_std               = vidioc_s_std,
1720         .vidioc_enum_input          = vidioc_enum_input,
1721         .vidioc_g_input             = vidioc_g_input,
1722         .vidioc_s_input             = vidioc_s_input,
1723         .vidioc_queryctrl           = vidioc_queryctrl,
1724         .vidioc_g_ctrl              = vidioc_g_ctrl,
1725         .vidioc_s_ctrl              = vidioc_s_ctrl,
1726         .vidioc_streamon            = vidioc_streamon,
1727         .vidioc_streamoff           = vidioc_streamoff,
1728         .vidioc_g_tuner             = vidioc_g_tuner,
1729         .vidioc_s_tuner             = vidioc_s_tuner,
1730         .vidioc_g_frequency         = vidioc_g_frequency,
1731         .vidioc_s_frequency         = vidioc_s_frequency,
1732
1733         .tvnorms                    = V4L2_STD_ALL,
1734         .current_norm               = V4L2_STD_PAL,
1735 };
1736
1737 static struct video_device em28xx_radio_template = {
1738         .name                 = "em28xx-radio",
1739         .type                 = VID_TYPE_TUNER,
1740         .fops                 = &radio_fops,
1741         .minor                = -1,
1742         .vidioc_querycap      = radio_querycap,
1743         .vidioc_g_tuner       = radio_g_tuner,
1744         .vidioc_enum_input    = radio_enum_input,
1745         .vidioc_g_audio       = radio_g_audio,
1746         .vidioc_s_tuner       = radio_s_tuner,
1747         .vidioc_s_audio       = radio_s_audio,
1748         .vidioc_s_input       = radio_s_input,
1749         .vidioc_queryctrl     = radio_queryctrl,
1750         .vidioc_g_ctrl        = vidioc_g_ctrl,
1751         .vidioc_s_ctrl        = vidioc_s_ctrl,
1752         .vidioc_g_frequency   = vidioc_g_frequency,
1753         .vidioc_s_frequency   = vidioc_s_frequency,
1754 };
1755
1756 /******************************** usb interface *****************************************/
1757
1758
1759 static LIST_HEAD(em28xx_extension_devlist);
1760 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1761
1762 int em28xx_register_extension(struct em28xx_ops *ops)
1763 {
1764         struct em28xx *h, *dev = NULL;
1765
1766         list_for_each_entry(h, &em28xx_devlist, devlist)
1767                 dev = h;
1768
1769         mutex_lock(&em28xx_extension_devlist_lock);
1770         list_add_tail(&ops->next, &em28xx_extension_devlist);
1771         if (dev)
1772                 ops->init(dev);
1773
1774         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1775         mutex_unlock(&em28xx_extension_devlist_lock);
1776
1777         return 0;
1778 }
1779 EXPORT_SYMBOL(em28xx_register_extension);
1780
1781 void em28xx_unregister_extension(struct em28xx_ops *ops)
1782 {
1783         struct em28xx *h, *dev = NULL;
1784
1785         list_for_each_entry(h, &em28xx_devlist, devlist)
1786                 dev = h;
1787
1788         if (dev)
1789                 ops->fini(dev);
1790
1791         mutex_lock(&em28xx_extension_devlist_lock);
1792         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1793         list_del(&ops->next);
1794         mutex_unlock(&em28xx_extension_devlist_lock);
1795 }
1796 EXPORT_SYMBOL(em28xx_unregister_extension);
1797
1798 struct video_device *em28xx_vdev_init(struct em28xx *dev,
1799                                       const struct video_device *template,
1800                                       const int type,
1801                                       const char *type_name)
1802 {
1803         struct video_device *vfd;
1804
1805         vfd = video_device_alloc();
1806         if (NULL == vfd)
1807                 return NULL;
1808         *vfd = *template;
1809         vfd->minor   = -1;
1810         vfd->dev = &dev->udev->dev;
1811         vfd->release = video_device_release;
1812         vfd->type = type;
1813
1814         snprintf(vfd->name, sizeof(vfd->name), "%s %s",
1815                  dev->name, type_name);
1816
1817         return vfd;
1818 }
1819
1820
1821 /*
1822  * em28xx_init_dev()
1823  * allocates and inits the device structs, registers i2c bus and v4l device
1824  */
1825 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1826                            int minor)
1827 {
1828         struct em28xx_ops *ops = NULL;
1829         struct em28xx *dev = *devhandle;
1830         int retval = -ENOMEM;
1831         int errCode;
1832         unsigned int maxh, maxw;
1833
1834         dev->udev = udev;
1835         mutex_init(&dev->lock);
1836         spin_lock_init(&dev->queue_lock);
1837         init_waitqueue_head(&dev->open);
1838         init_waitqueue_head(&dev->wait_frame);
1839         init_waitqueue_head(&dev->wait_stream);
1840
1841         dev->em28xx_write_regs = em28xx_write_regs;
1842         dev->em28xx_read_reg = em28xx_read_reg;
1843         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1844         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1845         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1846         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1847
1848         errCode = em28xx_read_reg(dev, CHIPID_REG);
1849         if (errCode >= 0)
1850                 em28xx_info("em28xx chip ID = %d\n", errCode);
1851
1852         em28xx_pre_card_setup(dev);
1853
1854         errCode = em28xx_config(dev);
1855         if (errCode) {
1856                 em28xx_errdev("error configuring device\n");
1857                 em28xx_devused &= ~(1<<dev->devno);
1858                 kfree(dev);
1859                 return -ENOMEM;
1860         }
1861
1862         /* register i2c bus */
1863         em28xx_i2c_register(dev);
1864
1865         /* Do board specific init and eeprom reading */
1866         em28xx_card_setup(dev);
1867
1868         /* Configure audio */
1869         em28xx_audio_analog_set(dev);
1870
1871         /* configure the device */
1872         em28xx_config_i2c(dev);
1873
1874         /* set default norm */
1875         dev->norm = em28xx_video_template.current_norm;
1876
1877         maxw = norm_maxw(dev);
1878         maxh = norm_maxh(dev);
1879
1880         /* set default image size */
1881         dev->width = maxw;
1882         dev->height = maxh;
1883         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1884         dev->field_size = dev->width * dev->height;
1885         dev->frame_size =
1886             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1887         dev->bytesperline = dev->width * 2;
1888         dev->hscale = 0;
1889         dev->vscale = 0;
1890         dev->ctl_input = 2;
1891
1892         errCode = em28xx_config(dev);
1893
1894         list_add_tail(&dev->devlist, &em28xx_devlist);
1895
1896         /* allocate and fill video video_device struct */
1897         dev->vdev = em28xx_vdev_init(dev, &em28xx_video_template,
1898                                           VID_TYPE_CAPTURE, "video");
1899         if (NULL == dev->vdev) {
1900                 em28xx_errdev("cannot allocate video_device.\n");
1901                 goto fail_unreg;
1902         }
1903         if (dev->has_tuner)
1904                 dev->vdev->type |= VID_TYPE_TUNER;
1905
1906         /* register v4l2 video video_device */
1907         retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1908                                        video_nr[dev->devno]);
1909         if (retval) {
1910                 em28xx_errdev("unable to register video device (error=%i).\n",
1911                               retval);
1912                 goto fail_unreg;
1913         }
1914
1915         /* Allocate and fill vbi video_device struct */
1916         dev->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
1917                                           VFL_TYPE_VBI, "vbi");
1918         /* register v4l2 vbi video_device */
1919         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1920                                         vbi_nr[dev->devno]) < 0) {
1921                 em28xx_errdev("unable to register vbi device\n");
1922                 retval = -ENODEV;
1923                 goto fail_unreg;
1924         }
1925
1926         if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
1927                 dev->radio_dev = em28xx_vdev_init(dev, &em28xx_radio_template,
1928                                         VFL_TYPE_RADIO, "radio");
1929                 if (NULL == dev->radio_dev) {
1930                         em28xx_errdev("cannot allocate video_device.\n");
1931                         goto fail_unreg;
1932                 }
1933                 retval = video_register_device(dev->radio_dev, VFL_TYPE_RADIO,
1934                                             radio_nr[dev->devno]);
1935                 if (retval < 0) {
1936                         em28xx_errdev("can't register radio device\n");
1937                         goto fail_unreg;
1938                 }
1939                 em28xx_info("Registered radio device as /dev/radio%d\n",
1940                             dev->radio_dev->minor & 0x1f);
1941         }
1942
1943
1944         if (dev->has_msp34xx) {
1945                 /* Send a reset to other chips via gpio */
1946                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1947                 msleep(3);
1948                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1949                 msleep(3);
1950         }
1951
1952         video_mux(dev, 0);
1953
1954         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1955                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1956                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1957
1958         mutex_lock(&em28xx_extension_devlist_lock);
1959         if (!list_empty(&em28xx_extension_devlist)) {
1960                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1961                         if (ops->id)
1962                                 ops->init(dev);
1963                 }
1964         }
1965         mutex_unlock(&em28xx_extension_devlist_lock);
1966
1967         return 0;
1968
1969 fail_unreg:
1970         em28xx_release_resources(dev);
1971         mutex_unlock(&dev->lock);
1972         kfree(dev);
1973         return retval;
1974 }
1975
1976 #if defined(CONFIG_MODULES) && defined(MODULE)
1977 static void request_module_async(struct work_struct *work)
1978 {
1979         struct em28xx *dev = container_of(work,
1980                              struct em28xx, request_module_wk);
1981
1982         if (!dev->has_audio_class)
1983                 request_module("em28xx-alsa");
1984 }
1985
1986 static void request_modules(struct em28xx *dev)
1987 {
1988         INIT_WORK(&dev->request_module_wk, request_module_async);
1989         schedule_work(&dev->request_module_wk);
1990 }
1991 #else
1992 #define request_modules(dev)
1993 #endif /* CONFIG_MODULES */
1994
1995 /*
1996  * em28xx_usb_probe()
1997  * checks for supported devices
1998  */
1999 static int em28xx_usb_probe(struct usb_interface *interface,
2000                             const struct usb_device_id *id)
2001 {
2002         const struct usb_endpoint_descriptor *endpoint;
2003         struct usb_device *udev;
2004         struct usb_interface *uif;
2005         struct em28xx *dev = NULL;
2006         int retval = -ENODEV;
2007         int i, nr, ifnum;
2008
2009         udev = usb_get_dev(interface_to_usbdev(interface));
2010         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
2011
2012         /* Check to see next free device and mark as used */
2013         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
2014         em28xx_devused|=1<<nr;
2015
2016         /* Don't register audio interfaces */
2017         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2018                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
2019                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
2020                                 ifnum,
2021                                 interface->altsetting[0].desc.bInterfaceClass);
2022
2023                 em28xx_devused&=~(1<<nr);
2024                 return -ENODEV;
2025         }
2026
2027         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
2028                         udev->descriptor.idVendor,udev->descriptor.idProduct,
2029                         ifnum,
2030                         interface->altsetting[0].desc.bInterfaceClass);
2031
2032         endpoint = &interface->cur_altsetting->endpoint[1].desc;
2033
2034         /* check if the device has the iso in endpoint at the correct place */
2035         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2036             USB_ENDPOINT_XFER_ISOC) {
2037                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
2038                 em28xx_devused&=~(1<<nr);
2039                 return -ENODEV;
2040         }
2041         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
2042                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
2043                 em28xx_devused&=~(1<<nr);
2044                 return -ENODEV;
2045         }
2046
2047         if (nr >= EM28XX_MAXBOARDS) {
2048                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
2049                 em28xx_devused&=~(1<<nr);
2050                 return -ENOMEM;
2051         }
2052
2053         /* allocate memory for our device state and initialize it */
2054         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2055         if (dev == NULL) {
2056                 em28xx_err(DRIVER_NAME ": out of memory!\n");
2057                 em28xx_devused&=~(1<<nr);
2058                 return -ENOMEM;
2059         }
2060
2061         snprintf(dev->name, 29, "em28xx #%d", nr);
2062         dev->devno = nr;
2063         dev->model = id->driver_info;
2064
2065         /* Checks if audio is provided by some interface */
2066         for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
2067                 uif = udev->config->interface[i];
2068                 if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2069                         dev->has_audio_class = 1;
2070                         break;
2071                 }
2072         }
2073
2074         printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
2075                    dev->has_audio_class ? "Has" : "Doesn't have");
2076
2077         /* compute alternate max packet sizes */
2078         uif = udev->actconfig->interface[0];
2079
2080         dev->num_alt=uif->num_altsetting;
2081         em28xx_info("Alternate settings: %i\n",dev->num_alt);
2082 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
2083         dev->alt_max_pkt_size = kmalloc(32*
2084                                                 dev->num_alt,GFP_KERNEL);
2085         if (dev->alt_max_pkt_size == NULL) {
2086                 em28xx_errdev("out of memory!\n");
2087                 em28xx_devused&=~(1<<nr);
2088                 kfree(dev);
2089                 return -ENOMEM;
2090         }
2091
2092         for (i = 0; i < dev->num_alt ; i++) {
2093                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
2094                                                         wMaxPacketSize);
2095                 dev->alt_max_pkt_size[i] =
2096                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
2097                 em28xx_info("Alternate setting %i, max size= %i\n",i,
2098                                                         dev->alt_max_pkt_size[i]);
2099         }
2100
2101         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
2102                 dev->model = card[nr];
2103
2104         /* allocate device struct */
2105         retval = em28xx_init_dev(&dev, udev, nr);
2106         if (retval)
2107                 return retval;
2108
2109         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
2110
2111         /* save our data pointer in this interface device */
2112         usb_set_intfdata(interface, dev);
2113
2114         request_modules(dev);
2115
2116         return 0;
2117 }
2118
2119 /*
2120  * em28xx_usb_disconnect()
2121  * called when the device gets diconencted
2122  * video device will be unregistered on v4l2_close in case it is still open
2123  */
2124 static void em28xx_usb_disconnect(struct usb_interface *interface)
2125 {
2126         struct em28xx *dev;
2127         struct em28xx_ops *ops = NULL;
2128
2129         dev = usb_get_intfdata(interface);
2130         usb_set_intfdata(interface, NULL);
2131
2132         if (!dev)
2133                 return;
2134
2135         em28xx_info("disconnecting %s\n", dev->vdev->name);
2136
2137         /* wait until all current v4l2 io is finished then deallocate resources */
2138         mutex_lock(&dev->lock);
2139
2140         wake_up_interruptible_all(&dev->open);
2141
2142         if (dev->users) {
2143                 em28xx_warn
2144                     ("device /dev/video%d is open! Deregistration and memory "
2145                      "deallocation are deferred on close.\n",
2146                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
2147
2148                 dev->state |= DEV_MISCONFIGURED;
2149                 em28xx_uninit_isoc(dev);
2150                 dev->state |= DEV_DISCONNECTED;
2151                 wake_up_interruptible(&dev->wait_frame);
2152                 wake_up_interruptible(&dev->wait_stream);
2153         } else {
2154                 dev->state |= DEV_DISCONNECTED;
2155                 em28xx_release_resources(dev);
2156         }
2157         mutex_unlock(&dev->lock);
2158
2159         mutex_lock(&em28xx_extension_devlist_lock);
2160         if (!list_empty(&em28xx_extension_devlist)) {
2161                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2162                         ops->fini(dev);
2163                 }
2164         }
2165         mutex_unlock(&em28xx_extension_devlist_lock);
2166
2167         if (!dev->users) {
2168                 kfree(dev->alt_max_pkt_size);
2169                 kfree(dev);
2170         }
2171 }
2172
2173 static struct usb_driver em28xx_usb_driver = {
2174         .name = "em28xx",
2175         .probe = em28xx_usb_probe,
2176         .disconnect = em28xx_usb_disconnect,
2177         .id_table = em28xx_id_table,
2178 };
2179
2180 static int __init em28xx_module_init(void)
2181 {
2182         int result;
2183
2184         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
2185                (EM28XX_VERSION_CODE >> 16) & 0xff,
2186                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
2187 #ifdef SNAPSHOT
2188         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
2189                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
2190 #endif
2191
2192         /* register this driver with the USB subsystem */
2193         result = usb_register(&em28xx_usb_driver);
2194         if (result)
2195                 em28xx_err(DRIVER_NAME
2196                            " usb_register failed. Error number %d.\n", result);
2197
2198         return result;
2199 }
2200
2201 static void __exit em28xx_module_exit(void)
2202 {
2203         /* deregister this driver with the USB subsystem */
2204         usb_deregister(&em28xx_usb_driver);
2205 }
2206
2207 module_init(em28xx_module_init);
2208 module_exit(em28xx_module_exit);