git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/em28xx/em28xx-video.c

   1 /*
   2    em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@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 #include <media/tuner.h>
  42
  43 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  44                       "Markus Rechberger <mrechberger@gmail.com>, " \
  45                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  46                       "Sascha Sommer <saschasommer@freenet.de>"
  47
  48 #define DRIVER_NAME         "em28xx"
  49 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  50 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 1, 0)
  51
  52 #define em28xx_videodbg(fmt, arg...) do {\
  53         if (video_debug) \
  54                 printk(KERN_INFO "%s %s :"fmt, \
  55                          dev->name, __FUNCTION__ , ##arg); } while (0)
  56
  57 MODULE_AUTHOR(DRIVER_AUTHOR);
  58 MODULE_DESCRIPTION(DRIVER_DESC);
  59 MODULE_LICENSE("GPL");
  60
  61 static LIST_HEAD(em28xx_devlist);
  62
  63 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  64 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  65 static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  66 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  67
  68 module_param_array(card,  int, NULL, 0444);
  69 module_param_array(video_nr, int, NULL, 0444);
  70 module_param_array(vbi_nr, int, NULL, 0444);
  71 module_param_array(radio_nr, int, NULL, 0444);
  72 MODULE_PARM_DESC(card,     "card type");
  73 MODULE_PARM_DESC(video_nr, "video device numbers");
  74 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
  75 MODULE_PARM_DESC(radio_nr, "radio device numbers");
  76
  77 static unsigned int video_debug = 0;
  78 module_param(video_debug,int,0644);
  79 MODULE_PARM_DESC(video_debug,"enable debug messages [video]");
  80
  81 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  82 static unsigned long em28xx_devused;
  83
  84 /* supported controls */
  85 /* Common to all boards */
  86 static struct v4l2_queryctrl em28xx_qctrl[] = {
  87         {
  88                 .id = V4L2_CID_AUDIO_VOLUME,
  89                 .type = V4L2_CTRL_TYPE_INTEGER,
  90                 .name = "Volume",
  91                 .minimum = 0x0,
  92                 .maximum = 0x1f,
  93                 .step = 0x1,
  94                 .default_value = 0x1f,
  95                 .flags = 0,
  96         },{
  97                 .id = V4L2_CID_AUDIO_MUTE,
  98                 .type = V4L2_CTRL_TYPE_BOOLEAN,
  99                 .name = "Mute",
 100                 .minimum = 0,
 101                 .maximum = 1,
 102                 .step = 1,
 103                 .default_value = 1,
 104                 .flags = 0,
 105         }
 106 };
 107
 108 static struct usb_driver em28xx_usb_driver;
 109
 110
 111 /*********************  v4l2 interface  ******************************************/
 112
 113 /*
 114  * em28xx_config()
 115  * inits registers with sane defaults
 116  */
 117 static int em28xx_config(struct em28xx *dev)
 118 {
 119
 120         /* Sets I2C speed to 100 KHz */
 121         if (!dev->is_em2800)
 122                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 123
 124         /* enable vbi capturing */
 125
 126 /*      em28xx_write_regs_req(dev,0x00,0x0e,"\xC0",1); audio register */
 127 /*      em28xx_write_regs_req(dev,0x00,0x0f,"\x80",1); clk register */
 128         em28xx_write_regs_req(dev,0x00,0x11,"\x51",1);
 129
 130         dev->mute = 1;          /* maybe not the right place... */
 131         dev->volume = 0x1f;
 132
 133         em28xx_outfmt_set_yuv422(dev);
 134         em28xx_colorlevels_set_default(dev);
 135         em28xx_compression_disable(dev);
 136
 137         return 0;
 138 }
 139
 140 /*
 141  * em28xx_config_i2c()
 142  * configure i2c attached devices
 143  */
 144 static void em28xx_config_i2c(struct em28xx *dev)
 145 {
 146         struct v4l2_routing route;
 147
 148         route.input = INPUT(dev->ctl_input)->vmux;
 149         route.output = 0;
 150         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 151         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 152         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 153 }
 154
 155 /*
 156  * em28xx_empty_framequeues()
 157  * prepare queues for incoming and outgoing frames
 158  */
 159 static void em28xx_empty_framequeues(struct em28xx *dev)
 160 {
 161         u32 i;
 162
 163         INIT_LIST_HEAD(&dev->inqueue);
 164         INIT_LIST_HEAD(&dev->outqueue);
 165
 166         for (i = 0; i < EM28XX_NUM_FRAMES; i++) {
 167                 dev->frame[i].state = F_UNUSED;
 168                 dev->frame[i].buf.bytesused = 0;
 169         }
 170 }
 171
 172 static void video_mux(struct em28xx *dev, int index)
 173 {
 174         struct v4l2_routing route;
 175
 176         route.input = INPUT(index)->vmux;
 177         route.output = 0;
 178         dev->ctl_input = index;
 179         dev->ctl_ainput = INPUT(index)->amux;
 180
 181         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 182
 183         if (dev->has_msp34xx) {
 184                 if (dev->i2s_speed)
 185                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ, &dev->i2s_speed);
 186                 route.input = dev->ctl_ainput;
 187                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 188                 /* Note: this is msp3400 specific */
 189                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING, &route);
 190         }
 191
 192         em28xx_set_audio_source(dev);
 193 }
 194
 195 /* Usage lock check functions */
 196 static int res_get(struct em28xx_fh *fh)
 197 {
 198         struct em28xx    *dev = fh->dev;
 199         int              rc   = 0;
 200
 201         /* This instance already has stream_on */
 202         if (fh->stream_on)
 203                 return rc;
 204
 205         mutex_lock(&dev->lock);
 206
 207         if (dev->stream_on)
 208                 rc = -EINVAL;
 209         else {
 210                 dev->stream_on = 1;
 211                 fh->stream_on  = 1;
 212         }
 213
 214         mutex_unlock(&dev->lock);
 215         return rc;
 216 }
 217
 218 static int res_check(struct em28xx_fh *fh)
 219 {
 220         return (fh->stream_on);
 221 }
 222
 223 static void res_free(struct em28xx_fh *fh)
 224 {
 225         struct em28xx    *dev = fh->dev;
 226
 227         mutex_lock(&dev->lock);
 228         fh->stream_on = 0;
 229         dev->stream_on = 0;
 230         mutex_unlock(&dev->lock);
 231 }
 232
 233 /*
 234  * em28xx_vm_open()
 235  */
 236 static void em28xx_vm_open(struct vm_area_struct *vma)
 237 {
 238         struct em28xx_frame_t *f = vma->vm_private_data;
 239         f->vma_use_count++;
 240 }
 241
 242 /*
 243  * em28xx_vm_close()
 244  */
 245 static void em28xx_vm_close(struct vm_area_struct *vma)
 246 {
 247         /* NOTE: buffers are not freed here */
 248         struct em28xx_frame_t *f = vma->vm_private_data;
 249
 250         if (f->vma_use_count)
 251                 f->vma_use_count--;
 252 }
 253
 254 static struct vm_operations_struct em28xx_vm_ops = {
 255         .open = em28xx_vm_open,
 256         .close = em28xx_vm_close,
 257 };
 258
 259
 260 /*
 261  * em28xx_get_ctrl()
 262  * return the current saturation, brightness or contrast, mute state
 263  */
 264 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 265 {
 266         switch (ctrl->id) {
 267         case V4L2_CID_AUDIO_MUTE:
 268                 ctrl->value = dev->mute;
 269                 return 0;
 270         case V4L2_CID_AUDIO_VOLUME:
 271                 ctrl->value = dev->volume;
 272                 return 0;
 273         default:
 274                 return -EINVAL;
 275         }
 276 }
 277
 278 /*
 279  * em28xx_set_ctrl()
 280  * mute or set new saturation, brightness or contrast
 281  */
 282 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 283 {
 284         switch (ctrl->id) {
 285         case V4L2_CID_AUDIO_MUTE:
 286                 if (ctrl->value != dev->mute) {
 287                         dev->mute = ctrl->value;
 288                         return em28xx_audio_analog_set(dev);
 289                 }
 290                 return 0;
 291         case V4L2_CID_AUDIO_VOLUME:
 292                 dev->volume = ctrl->value;
 293                 return em28xx_audio_analog_set(dev);
 294         default:
 295                 return -EINVAL;
 296         }
 297 }
 298
 299 /*
 300  * em28xx_stream_interrupt()
 301  * stops streaming
 302  */
 303 static int em28xx_stream_interrupt(struct em28xx *dev)
 304 {
 305         int rc = 0;
 306
 307         /* stop reading from the device */
 308
 309         dev->stream = STREAM_INTERRUPT;
 310         rc = wait_event_timeout(dev->wait_stream,
 311                                 (dev->stream == STREAM_OFF) ||
 312                                 (dev->state & DEV_DISCONNECTED),
 313                                 EM28XX_URB_TIMEOUT);
 314
 315         if (rc) {
 316                 dev->state |= DEV_MISCONFIGURED;
 317                 em28xx_videodbg("device is misconfigured; close and "
 318                         "open /dev/video%d again\n",
 319                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
 320                 return rc;
 321         }
 322
 323         return 0;
 324 }
 325
 326
 327 static int check_dev(struct em28xx *dev)
 328 {
 329         if (dev->state & DEV_DISCONNECTED) {
 330                 em28xx_errdev("v4l2 ioctl: device not present\n");
 331                 return -ENODEV;
 332         }
 333
 334         if (dev->state & DEV_MISCONFIGURED) {
 335                 em28xx_errdev("v4l2 ioctl: device is misconfigured; "
 336                               "close and open it again\n");
 337                 return -EIO;
 338         }
 339         return 0;
 340 }
 341
 342 static void get_scale(struct em28xx *dev,
 343                         unsigned int width, unsigned int height,
 344                         unsigned int *hscale, unsigned int *vscale)
 345 {
 346         unsigned int          maxw   = norm_maxw(dev);
 347         unsigned int          maxh   = norm_maxh(dev);
 348
 349         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
 350         if (*hscale >= 0x4000)
 351                 *hscale = 0x3fff;
 352
 353         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
 354         if (*vscale >= 0x4000)
 355                 *vscale = 0x3fff;
 356 }
 357
 358 /* ------------------------------------------------------------------
 359         IOCTL vidioc handling
 360    ------------------------------------------------------------------*/
 361
 362 static int vidioc_g_fmt_cap(struct file *file, void *priv,
 363                                         struct v4l2_format *f)
 364 {
 365         struct em28xx_fh      *fh  = priv;
 366         struct em28xx         *dev = fh->dev;
 367
 368         mutex_lock(&dev->lock);
 369
 370         f->fmt.pix.width = dev->width;
 371         f->fmt.pix.height = dev->height;
 372         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 373         f->fmt.pix.bytesperline = dev->bytesperline;
 374         f->fmt.pix.sizeimage = dev->frame_size;
 375         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 376
 377         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 378         f->fmt.pix.field = dev->interlaced ?
 379                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
 380
 381         mutex_unlock(&dev->lock);
 382         return 0;
 383 }
 384
 385 static int vidioc_try_fmt_cap(struct file *file, void *priv,
 386                         struct v4l2_format *f)
 387 {
 388         struct em28xx_fh      *fh    = priv;
 389         struct em28xx         *dev   = fh->dev;
 390         int                   width  = f->fmt.pix.width;
 391         int                   height = f->fmt.pix.height;
 392         unsigned int          maxw   = norm_maxw(dev);
 393         unsigned int          maxh   = norm_maxh(dev);
 394         unsigned int          hscale, vscale;
 395
 396         /* width must even because of the YUYV format
 397            height must be even because of interlacing */
 398         height &= 0xfffe;
 399         width &= 0xfffe;
 400
 401         if (height < 32)
 402                 height = 32;
 403         if (height > maxh)
 404                 height = maxh;
 405         if (width < 48)
 406                 width = 48;
 407         if (width > maxw)
 408                 width = maxw;
 409
 410         mutex_lock(&dev->lock);
 411
 412         if (dev->is_em2800) {
 413                 /* the em2800 can only scale down to 50% */
 414                 if (height % (maxh / 2))
 415                         height = maxh;
 416                 if (width % (maxw / 2))
 417                         width = maxw;
 418                 /* according to empiatech support */
 419                 /* the MaxPacketSize is to small to support */
 420                 /* framesizes larger than 640x480 @ 30 fps */
 421                 /* or 640x576 @ 25 fps. As this would cut */
 422                 /* of a part of the image we prefer */
 423                 /* 360x576 or 360x480 for now */
 424                 if (width == maxw && height == maxh)
 425                         width /= 2;
 426         }
 427
 428         get_scale(dev, width, height, &hscale, &vscale);
 429
 430         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 431         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 432
 433         f->fmt.pix.width = width;
 434         f->fmt.pix.height = height;
 435         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 436         f->fmt.pix.bytesperline = width * 2;
 437         f->fmt.pix.sizeimage = width * 2 * height;
 438         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 439         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 440
 441         mutex_unlock(&dev->lock);
 442         return 0;
 443 }
 444
 445 static int vidioc_s_fmt_cap(struct file *file, void *priv,
 446                         struct v4l2_format *f)
 447 {
 448         struct em28xx_fh      *fh  = priv;
 449         struct em28xx         *dev = fh->dev;
 450         int                   rc, i;
 451
 452         rc = check_dev(dev);
 453         if (rc < 0)
 454                 return rc;
 455
 456         vidioc_try_fmt_cap(file, priv, f);
 457
 458         mutex_lock(&dev->lock);
 459
 460         for (i = 0; i < dev->num_frames; i++)
 461                 if (dev->frame[i].vma_use_count) {
 462                         em28xx_videodbg("VIDIOC_S_FMT failed. "
 463                                         "Unmap the buffers first.\n");
 464                         rc = -EINVAL;
 465                         goto err;
 466                 }
 467
 468         /* stop io in case it is already in progress */
 469         if (dev->stream == STREAM_ON) {
 470                 em28xx_videodbg("VIDIOC_SET_FMT: interrupting stream\n");
 471                 rc = em28xx_stream_interrupt(dev);
 472                 if (rc < 0)
 473                         goto err;
 474         }
 475
 476         em28xx_release_buffers(dev);
 477         dev->io = IO_NONE;
 478
 479         /* set new image size */
 480         dev->width = f->fmt.pix.width;
 481         dev->height = f->fmt.pix.height;
 482         dev->frame_size = dev->width * dev->height * 2;
 483         dev->field_size = dev->frame_size >> 1;
 484         dev->bytesperline = dev->width * 2;
 485         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 486
 487         /* FIXME: This is really weird! Why capture is starting with
 488            this ioctl ???
 489          */
 490         em28xx_uninit_isoc(dev);
 491         em28xx_set_alternate(dev);
 492         em28xx_capture_start(dev, 1);
 493         em28xx_resolution_set(dev);
 494         em28xx_init_isoc(dev);
 495         rc = 0;
 496
 497 err:
 498         mutex_unlock(&dev->lock);
 499         return rc;
 500 }
 501
 502 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *norm)
 503 {
 504         struct em28xx_fh   *fh  = priv;
 505         struct em28xx      *dev = fh->dev;
 506         struct v4l2_format f;
 507         int                rc;
 508
 509         rc = check_dev(dev);
 510         if (rc < 0)
 511                 return rc;
 512
 513         mutex_lock(&dev->lock);
 514         dev->norm = *norm;
 515         mutex_unlock(&dev->lock);
 516
 517         /* Adjusts width/height, if needed */
 518         f.fmt.pix.width = dev->width;
 519         f.fmt.pix.height = dev->height;
 520         vidioc_try_fmt_cap(file, priv, &f);
 521
 522         mutex_lock(&dev->lock);
 523
 524         /* set new image size */
 525         dev->width = f.fmt.pix.width;
 526         dev->height = f.fmt.pix.height;
 527         dev->frame_size = dev->width * dev->height * 2;
 528         dev->field_size = dev->frame_size >> 1;
 529         dev->bytesperline = dev->width * 2;
 530         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 531
 532         em28xx_resolution_set(dev);
 533         em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);
 534
 535         mutex_unlock(&dev->lock);
 536         return 0;
 537 }
 538
 539 static const char *iname[] = {
 540         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 541         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 542         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 543         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 544         [EM28XX_VMUX_SVIDEO]     = "S-Video",
 545         [EM28XX_VMUX_TELEVISION] = "Television",
 546         [EM28XX_VMUX_CABLE]      = "Cable TV",
 547         [EM28XX_VMUX_DVB]        = "DVB",
 548         [EM28XX_VMUX_DEBUG]      = "for debug only",
 549 };
 550
 551 static int vidioc_enum_input(struct file *file, void *priv,
 552                                 struct v4l2_input *i)
 553 {
 554         struct em28xx_fh   *fh  = priv;
 555         struct em28xx      *dev = fh->dev;
 556         unsigned int       n;
 557
 558         n = i->index;
 559         if (n >= MAX_EM28XX_INPUT)
 560                 return -EINVAL;
 561         if (0 == INPUT(n)->type)
 562                 return -EINVAL;
 563
 564         i->index = n;
 565         i->type = V4L2_INPUT_TYPE_CAMERA;
 566
 567         strcpy(i->name, iname[INPUT(n)->type]);
 568
 569         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 570                 (EM28XX_VMUX_CABLE == INPUT(n)->type))
 571                 i->type = V4L2_INPUT_TYPE_TUNER;
 572
 573         i->std = dev->vdev->tvnorms;
 574
 575         return 0;
 576 }
 577
 578 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 579 {
 580         struct em28xx_fh   *fh  = priv;
 581         struct em28xx      *dev = fh->dev;
 582
 583         *i = dev->ctl_input;
 584
 585         return 0;
 586 }
 587
 588 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 589 {
 590         struct em28xx_fh   *fh  = priv;
 591         struct em28xx      *dev = fh->dev;
 592         int                rc;
 593
 594         rc = check_dev(dev);
 595         if (rc < 0)
 596                 return rc;
 597
 598         if (i >= MAX_EM28XX_INPUT)
 599                 return -EINVAL;
 600         if (0 == INPUT(i)->type)
 601                 return -EINVAL;
 602
 603         mutex_lock(&dev->lock);
 604
 605         video_mux(dev, i);
 606
 607         mutex_unlock(&dev->lock);
 608         return 0;
 609 }
 610
 611 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 612 {
 613         struct em28xx_fh   *fh    = priv;
 614         struct em28xx      *dev   = fh->dev;
 615         unsigned int        index = a->index;
 616
 617         if (a->index > 1)
 618                 return -EINVAL;
 619
 620         index = dev->ctl_ainput;
 621
 622         if (index == 0) {
 623                 strcpy(a->name, "Television");
 624         } else {
 625                 strcpy(a->name, "Line In");
 626         }
 627         a->capability = V4L2_AUDCAP_STEREO;
 628         a->index = index;
 629
 630         return 0;
 631 }
 632
 633 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 634 {
 635         struct em28xx_fh   *fh  = priv;
 636         struct em28xx      *dev = fh->dev;
 637
 638         if (a->index != dev->ctl_ainput)
 639                 return -EINVAL;
 640
 641         return 0;
 642 }
 643
 644 static int vidioc_queryctrl(struct file *file, void *priv,
 645                                 struct v4l2_queryctrl *qc)
 646 {
 647         struct em28xx_fh      *fh  = priv;
 648         struct em28xx         *dev = fh->dev;
 649         int                   id  = qc->id;
 650         int                   i;
 651         int                   rc;
 652
 653         rc = check_dev(dev);
 654         if (rc < 0)
 655                 return rc;
 656
 657         memset(qc, 0, sizeof(*qc));
 658
 659         qc->id = id;
 660
 661         if (!dev->has_msp34xx) {
 662                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 663                         if (qc->id && qc->id == em28xx_qctrl[i].id) {
 664                                 memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
 665                                 return 0;
 666                         }
 667                 }
 668         }
 669         mutex_lock(&dev->lock);
 670         em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
 671         mutex_unlock(&dev->lock);
 672
 673         if (qc->type)
 674                 return 0;
 675         else
 676                 return -EINVAL;
 677 }
 678
 679 static int vidioc_g_ctrl(struct file *file, void *priv,
 680                                 struct v4l2_control *ctrl)
 681 {
 682         struct em28xx_fh      *fh  = priv;
 683         struct em28xx         *dev = fh->dev;
 684         int                   rc;
 685
 686         rc = check_dev(dev);
 687         if (rc < 0)
 688                 return rc;
 689         mutex_lock(&dev->lock);
 690
 691         if (!dev->has_msp34xx)
 692                 rc = em28xx_get_ctrl(dev, ctrl);
 693         else
 694                 rc = -EINVAL;
 695
 696         if (rc == -EINVAL) {
 697                 em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
 698                 rc = 0;
 699         }
 700
 701         mutex_unlock(&dev->lock);
 702         return rc;
 703 }
 704
 705 static int vidioc_s_ctrl(struct file *file, void *priv,
 706                                 struct v4l2_control *ctrl)
 707 {
 708         struct em28xx_fh      *fh  = priv;
 709         struct em28xx         *dev = fh->dev;
 710         u8                    i;
 711         int                   rc;
 712
 713         rc = check_dev(dev);
 714         if (rc < 0)
 715                 return rc;
 716
 717         mutex_lock(&dev->lock);
 718
 719         if (dev->has_msp34xx)
 720                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 721         else {
 722                 rc = 1;
 723                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 724                         if (ctrl->id == em28xx_qctrl[i].id) {
 725                                 if (ctrl->value < em28xx_qctrl[i].minimum ||
 726                                     ctrl->value > em28xx_qctrl[i].maximum) {
 727                                         rc = -ERANGE;
 728                                         break;
 729                                 }
 730
 731                                 rc = em28xx_set_ctrl(dev, ctrl);
 732                                 break;
 733                         }
 734                 }
 735         }
 736
 737         /* Control not found - try to send it to the attached devices */
 738         if (rc == 1) {
 739                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
 740                 rc = 0;
 741         }
 742
 743         mutex_unlock(&dev->lock);
 744         return rc;
 745 }
 746
 747 static int vidioc_g_tuner(struct file *file, void *priv,
 748                                 struct v4l2_tuner *t)
 749 {
 750         struct em28xx_fh      *fh  = priv;
 751         struct em28xx         *dev = fh->dev;
 752         int                   rc;
 753
 754         rc = check_dev(dev);
 755         if (rc < 0)
 756                 return rc;
 757
 758         if (0 != t->index)
 759                 return -EINVAL;
 760
 761         strcpy(t->name, "Tuner");
 762
 763         mutex_lock(&dev->lock);
 764
 765         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
 766
 767         mutex_unlock(&dev->lock);
 768         return 0;
 769 }
 770
 771 static int vidioc_s_tuner(struct file *file, void *priv,
 772                                 struct v4l2_tuner *t)
 773 {
 774         struct em28xx_fh      *fh  = priv;
 775         struct em28xx         *dev = fh->dev;
 776         int                   rc;
 777
 778         rc = check_dev(dev);
 779         if (rc < 0)
 780                 return rc;
 781
 782         if (0 != t->index)
 783                 return -EINVAL;
 784
 785         mutex_lock(&dev->lock);
 786
 787         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
 788
 789         mutex_unlock(&dev->lock);
 790         return 0;
 791 }
 792
 793 static int vidioc_g_frequency(struct file *file, void *priv,
 794                                 struct v4l2_frequency *f)
 795 {
 796         struct em28xx_fh      *fh  = priv;
 797         struct em28xx         *dev = fh->dev;
 798
 799         f->type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
 800         f->frequency = dev->ctl_freq;
 801
 802         return 0;
 803 }
 804
 805 static int vidioc_s_frequency(struct file *file, void *priv,
 806                                 struct v4l2_frequency *f)
 807 {
 808         struct em28xx_fh      *fh  = priv;
 809         struct em28xx         *dev = fh->dev;
 810         int                   rc;
 811
 812         rc = check_dev(dev);
 813         if (rc < 0)
 814                 return rc;
 815
 816         if (0 != f->tuner)
 817                 return -EINVAL;
 818
 819         if (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
 820                 return -EINVAL;
 821         if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
 822                 return -EINVAL;
 823
 824         mutex_lock(&dev->lock);
 825
 826         dev->ctl_freq = f->frequency;
 827         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
 828
 829         mutex_unlock(&dev->lock);
 830         return 0;
 831 }
 832
 833 static int vidioc_cropcap(struct file *file, void *priv,
 834                                         struct v4l2_cropcap *cc)
 835 {
 836         struct em28xx_fh      *fh  = priv;
 837         struct em28xx         *dev = fh->dev;
 838
 839         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 840                 return -EINVAL;
 841
 842         cc->bounds.left = 0;
 843         cc->bounds.top = 0;
 844         cc->bounds.width = dev->width;
 845         cc->bounds.height = dev->height;
 846         cc->defrect = cc->bounds;
 847         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
 848         cc->pixelaspect.denominator = 59;
 849
 850         return 0;
 851 }
 852
 853 static int vidioc_streamon(struct file *file, void *priv,
 854                                         enum v4l2_buf_type type)
 855 {
 856         struct em28xx_fh      *fh  = priv;
 857         struct em28xx         *dev = fh->dev;
 858         int                   rc;
 859
 860         rc = check_dev(dev);
 861         if (rc < 0)
 862                 return rc;
 863
 864         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 865                 return -EINVAL;
 866
 867         if (list_empty(&dev->inqueue))
 868                 return -EINVAL;
 869
 870         mutex_lock(&dev->lock);
 871
 872         if (unlikely(res_get(fh) < 0)) {
 873                 mutex_unlock(&dev->lock);
 874                 return -EBUSY;
 875         }
 876
 877         dev->stream = STREAM_ON;        /* FIXME: Start video capture here? */
 878
 879         mutex_unlock(&dev->lock);
 880         return 0;
 881 }
 882
 883 static int vidioc_streamoff(struct file *file, void *priv,
 884                                         enum v4l2_buf_type type)
 885 {
 886         struct em28xx_fh      *fh  = priv;
 887         struct em28xx         *dev = fh->dev;
 888         int                   rc;
 889
 890         rc = check_dev(dev);
 891         if (rc < 0)
 892                 return rc;
 893
 894         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
 895                 return -EINVAL;
 896
 897         mutex_lock(&dev->lock);
 898
 899         if (dev->stream == STREAM_ON) {
 900                 em28xx_videodbg("VIDIOC_STREAMOFF: interrupting stream\n");
 901                 rc = em28xx_stream_interrupt(dev);
 902                 if (rc < 0) {
 903                         mutex_unlock(&dev->lock);
 904                         return rc;
 905                 }
 906         }
 907
 908         em28xx_empty_framequeues(dev);
 909
 910         mutex_unlock(&dev->lock);
 911         return 0;
 912 }
 913
 914 static int vidioc_querycap(struct file *file, void  *priv,
 915                                         struct v4l2_capability *cap)
 916 {
 917         struct em28xx_fh      *fh  = priv;
 918         struct em28xx         *dev = fh->dev;
 919
 920         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
 921         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
 922         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
 923
 924         cap->version = EM28XX_VERSION_CODE;
 925
 926         cap->capabilities =
 927                         V4L2_CAP_SLICED_VBI_CAPTURE |
 928                         V4L2_CAP_VIDEO_CAPTURE |
 929                         V4L2_CAP_AUDIO |
 930                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 931
 932         if (dev->tuner_type != TUNER_ABSENT)
 933                 cap->capabilities |= V4L2_CAP_TUNER;
 934
 935         return 0;
 936 }
 937
 938 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
 939                                         struct v4l2_fmtdesc *fmtd)
 940 {
 941         if (fmtd->index != 0)
 942                 return -EINVAL;
 943
 944         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 945         strcpy(fmtd->description, "Packed YUY2");
 946         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 947         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
 948
 949         return 0;
 950 }
 951
 952 /* Sliced VBI ioctls */
 953 static int vidioc_g_fmt_vbi_capture(struct file *file, void *priv,
 954                                         struct v4l2_format *f)
 955 {
 956         struct em28xx_fh      *fh  = priv;
 957         struct em28xx         *dev = fh->dev;
 958         int                   rc;
 959
 960         rc = check_dev(dev);
 961         if (rc < 0)
 962                 return rc;
 963
 964         mutex_lock(&dev->lock);
 965
 966         f->fmt.sliced.service_set = 0;
 967
 968         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 969
 970         if (f->fmt.sliced.service_set == 0)
 971                 rc = -EINVAL;
 972
 973         mutex_unlock(&dev->lock);
 974         return rc;
 975 }
 976
 977 static int vidioc_try_set_vbi_capture(struct file *file, void *priv,
 978                         struct v4l2_format *f)
 979 {
 980         struct em28xx_fh      *fh  = priv;
 981         struct em28xx         *dev = fh->dev;
 982         int                   rc;
 983
 984         rc = check_dev(dev);
 985         if (rc < 0)
 986                 return rc;
 987
 988         mutex_lock(&dev->lock);
 989         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 990         mutex_unlock(&dev->lock);
 991
 992         if (f->fmt.sliced.service_set == 0)
 993                 return -EINVAL;
 994
 995         return 0;
 996 }
 997
 998
 999 static int vidioc_reqbufs(struct file *file, void *priv,
1000                           struct v4l2_requestbuffers *rb)
1001 {
1002         struct em28xx_fh      *fh  = priv;
1003         struct em28xx         *dev = fh->dev;
1004         u32                   i;
1005         int                   rc;
1006
1007         rc = check_dev(dev);
1008         if (rc < 0)
1009                 return rc;
1010
1011         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1012                 rb->memory != V4L2_MEMORY_MMAP)
1013                 return -EINVAL;
1014
1015         if (dev->io == IO_READ) {
1016                 em28xx_videodbg("method is set to read;"
1017                                 " close and open the device again to"
1018                                 " choose the mmap I/O method\n");
1019                 return -EINVAL;
1020         }
1021
1022         for (i = 0; i < dev->num_frames; i++)
1023                 if (dev->frame[i].vma_use_count) {
1024                         em28xx_videodbg("VIDIOC_REQBUFS failed; "
1025                                         "previous buffers are still mapped\n");
1026                         return -EINVAL;
1027                 }
1028
1029         mutex_lock(&dev->lock);
1030
1031         if (dev->stream == STREAM_ON) {
1032                 em28xx_videodbg("VIDIOC_REQBUFS: interrupting stream\n");
1033                 rc = em28xx_stream_interrupt(dev);
1034                 if (rc < 0) {
1035                         mutex_unlock(&dev->lock);
1036                         return rc;
1037                 }
1038         }
1039
1040         em28xx_empty_framequeues(dev);
1041
1042         em28xx_release_buffers(dev);
1043         if (rb->count)
1044                 rb->count = em28xx_request_buffers(dev, rb->count);
1045
1046         dev->frame_current = NULL;
1047         dev->io = rb->count ? IO_MMAP : IO_NONE;
1048
1049         mutex_unlock(&dev->lock);
1050         return 0;
1051 }
1052
1053 static int vidioc_querybuf(struct file *file, void *priv,
1054                            struct v4l2_buffer *b)
1055 {
1056         struct em28xx_fh      *fh  = priv;
1057         struct em28xx         *dev = fh->dev;
1058         int                   rc;
1059
1060         rc = check_dev(dev);
1061         if (rc < 0)
1062                 return rc;
1063
1064         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1065                 b->index >= dev->num_frames || dev->io != IO_MMAP)
1066                 return -EINVAL;
1067
1068         mutex_lock(&dev->lock);
1069
1070         memcpy(b, &dev->frame[b->index].buf, sizeof(*b));
1071
1072         if (dev->frame[b->index].vma_use_count)
1073                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1074
1075         if (dev->frame[b->index].state == F_DONE)
1076                 b->flags |= V4L2_BUF_FLAG_DONE;
1077         else if (dev->frame[b->index].state != F_UNUSED)
1078                 b->flags |= V4L2_BUF_FLAG_QUEUED;
1079
1080         mutex_unlock(&dev->lock);
1081         return 0;
1082 }
1083
1084 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1085 {
1086         struct em28xx_fh      *fh  = priv;
1087         struct em28xx         *dev = fh->dev;
1088         unsigned long         lock_flags;
1089         int                   rc;
1090
1091         rc = check_dev(dev);
1092         if (rc < 0)
1093                 return rc;
1094
1095         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE  || dev->io != IO_MMAP ||
1096                                                 b->index >= dev->num_frames)
1097                 return -EINVAL;
1098
1099         if (dev->frame[b->index].state != F_UNUSED)
1100                 return -EAGAIN;
1101
1102         dev->frame[b->index].state = F_QUEUED;
1103
1104         /* add frame to fifo */
1105         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1106         list_add_tail(&dev->frame[b->index].frame, &dev->inqueue);
1107         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1108
1109         return 0;
1110 }
1111
1112 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1113 {
1114         struct em28xx_fh      *fh  = priv;
1115         struct em28xx         *dev = fh->dev;
1116         int                   rc;
1117         struct em28xx_frame_t *f;
1118         unsigned long         lock_flags;
1119
1120         rc = check_dev(dev);
1121         if (rc < 0)
1122                 return rc;
1123
1124         if (b->type != V4L2_BUF_TYPE_VIDEO_CAPTURE || dev->io != IO_MMAP)
1125                 return -EINVAL;
1126
1127         if (list_empty(&dev->outqueue)) {
1128                 if (dev->stream == STREAM_OFF)
1129                         return -EINVAL;
1130
1131                 if (file->f_flags & O_NONBLOCK)
1132                         return -EAGAIN;
1133
1134                 rc = wait_event_interruptible(dev->wait_frame,
1135                                         (!list_empty(&dev->outqueue)) ||
1136                                         (dev->state & DEV_DISCONNECTED));
1137                 if (rc)
1138                         return rc;
1139
1140                 if (dev->state & DEV_DISCONNECTED)
1141                         return -ENODEV;
1142         }
1143
1144         spin_lock_irqsave(&dev->queue_lock, lock_flags);
1145         f = list_entry(dev->outqueue.next, struct em28xx_frame_t, frame);
1146         list_del(dev->outqueue.next);
1147         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1148
1149         f->state = F_UNUSED;
1150         memcpy(b, &f->buf, sizeof(*b));
1151
1152         if (f->vma_use_count)
1153                 b->flags |= V4L2_BUF_FLAG_MAPPED;
1154
1155         return 0;
1156 }
1157
1158 /* ----------------------------------------------------------- */
1159 /* RADIO ESPECIFIC IOCTLS                                      */
1160 /* ----------------------------------------------------------- */
1161
1162 static int radio_querycap(struct file *file, void  *priv,
1163                           struct v4l2_capability *cap)
1164 {
1165         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1166
1167         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1168         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1169         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1170
1171         cap->version = EM28XX_VERSION_CODE;
1172         cap->capabilities = V4L2_CAP_TUNER;
1173         return 0;
1174 }
1175
1176 static int radio_g_tuner(struct file *file, void *priv,
1177                          struct v4l2_tuner *t)
1178 {
1179         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1180
1181         if (unlikely(t->index > 0))
1182                 return -EINVAL;
1183
1184         strcpy(t->name, "Radio");
1185         t->type = V4L2_TUNER_RADIO;
1186
1187         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1188         return 0;
1189 }
1190
1191 static int radio_enum_input(struct file *file, void *priv,
1192                             struct v4l2_input *i)
1193 {
1194         if (i->index != 0)
1195                 return -EINVAL;
1196         strcpy(i->name, "Radio");
1197         i->type = V4L2_INPUT_TYPE_TUNER;
1198
1199         return 0;
1200 }
1201
1202 static int radio_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1203 {
1204         if (unlikely(a->index))
1205                 return -EINVAL;
1206
1207         strcpy(a->name, "Radio");
1208         return 0;
1209 }
1210
1211 static int radio_s_tuner(struct file *file, void *priv,
1212                          struct v4l2_tuner *t)
1213 {
1214         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1215
1216         if (0 != t->index)
1217                 return -EINVAL;
1218
1219         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1220
1221         return 0;
1222 }
1223
1224 static int radio_s_audio(struct file *file, void *fh,
1225                          struct v4l2_audio *a)
1226 {
1227         return 0;
1228 }
1229
1230 static int radio_s_input(struct file *file, void *fh, unsigned int i)
1231 {
1232         return 0;
1233 }
1234
1235 static int radio_queryctrl(struct file *file, void *priv,
1236                            struct v4l2_queryctrl *qc)
1237 {
1238         int i;
1239
1240         if (qc->id <  V4L2_CID_BASE ||
1241                 qc->id >= V4L2_CID_LASTP1)
1242                 return -EINVAL;
1243
1244         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1245                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1246                         memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
1247                         return 0;
1248                 }
1249         }
1250
1251         return -EINVAL;
1252 }
1253
1254 /*
1255  * em28xx_v4l2_open()
1256  * inits the device and starts isoc transfer
1257  */
1258 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1259 {
1260         int minor = iminor(inode);
1261         int errCode = 0, radio = 0;
1262         struct em28xx *h,*dev = NULL;
1263         struct em28xx_fh *fh;
1264
1265         list_for_each_entry(h, &em28xx_devlist, devlist) {
1266                 if (h->vdev->minor == minor) {
1267                         dev  = h;
1268                         dev->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1269                 }
1270                 if (h->vbi_dev->minor == minor) {
1271                         dev  = h;
1272                         dev->type = V4L2_BUF_TYPE_VBI_CAPTURE;
1273                 }
1274                 if (h->radio_dev &&
1275                     h->radio_dev->minor == minor) {
1276                         radio = 1;
1277                         dev   = h;
1278                 }
1279         }
1280         if (NULL == dev)
1281                 return -ENODEV;
1282
1283         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1284                                 minor,v4l2_type_names[dev->type],dev->users);
1285
1286         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1287
1288         if (!fh) {
1289                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1290                 return -ENOMEM;
1291         }
1292         mutex_lock(&dev->lock);
1293         fh->dev = dev;
1294         fh->radio = radio;
1295         filp->private_data = fh;
1296
1297         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1298                 em28xx_set_alternate(dev);
1299
1300                 dev->width = norm_maxw(dev);
1301                 dev->height = norm_maxh(dev);
1302                 dev->frame_size = dev->width * dev->height * 2;
1303                 dev->field_size = dev->frame_size >> 1; /*both_fileds ? dev->frame_size>>1 : dev->frame_size; */
1304                 dev->bytesperline = dev->width * 2;
1305                 dev->hscale = 0;
1306                 dev->vscale = 0;
1307
1308                 em28xx_capture_start(dev, 1);
1309                 em28xx_resolution_set(dev);
1310
1311
1312                 /* start the transfer */
1313                 errCode = em28xx_init_isoc(dev);
1314                 if (errCode)
1315                         goto err;
1316
1317                 em28xx_empty_framequeues(dev);
1318         }
1319         if (fh->radio) {
1320                 em28xx_videodbg("video_open: setting radio device\n");
1321                 em28xx_i2c_call_clients(dev, AUDC_SET_RADIO, NULL);
1322         }
1323
1324         dev->users++;
1325
1326 err:
1327         mutex_unlock(&dev->lock);
1328         return errCode;
1329 }
1330
1331 /*
1332  * em28xx_realease_resources()
1333  * unregisters the v4l2,i2c and usb devices
1334  * called when the device gets disconected or at module unload
1335 */
1336 static void em28xx_release_resources(struct em28xx *dev)
1337 {
1338
1339         /*FIXME: I2C IR should be disconnected */
1340
1341         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1342                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1343                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1344         list_del(&dev->devlist);
1345         if (dev->radio_dev) {
1346                 if (-1 != dev->radio_dev->minor)
1347                         video_unregister_device(dev->radio_dev);
1348                 else
1349                         video_device_release(dev->radio_dev);
1350                 dev->radio_dev = NULL;
1351         }
1352         if (dev->vbi_dev) {
1353                 if (-1 != dev->vbi_dev->minor)
1354                         video_unregister_device(dev->vbi_dev);
1355                 else
1356                         video_device_release(dev->vbi_dev);
1357                 dev->vbi_dev = NULL;
1358         }
1359         if (dev->vdev) {
1360                 if (-1 != dev->vdev->minor)
1361                         video_unregister_device(dev->vdev);
1362                 else
1363                         video_device_release(dev->vdev);
1364                 dev->vdev = NULL;
1365         }
1366         em28xx_i2c_unregister(dev);
1367         usb_put_dev(dev->udev);
1368
1369         /* Mark device as unused */
1370         em28xx_devused&=~(1<<dev->devno);
1371 }
1372
1373 /*
1374  * em28xx_v4l2_close()
1375  * stops streaming and deallocates all resources allocated by the v4l2 calls and ioctls
1376  */
1377 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1378 {
1379         struct em28xx_fh *fh  = filp->private_data;
1380         struct em28xx    *dev = fh->dev;
1381         int              errCode;
1382
1383         em28xx_videodbg("users=%d\n", dev->users);
1384
1385
1386         if (res_check(fh))
1387                 res_free(fh);
1388
1389         mutex_lock(&dev->lock);
1390
1391         if (dev->users == 1) {
1392                 em28xx_uninit_isoc(dev);
1393                 em28xx_release_buffers(dev);
1394                 dev->io = IO_NONE;
1395
1396                 /* the device is already disconnect,
1397                    free the remaining resources */
1398                 if (dev->state & DEV_DISCONNECTED) {
1399                         em28xx_release_resources(dev);
1400                         mutex_unlock(&dev->lock);
1401                         kfree(dev);
1402                         return 0;
1403                 }
1404
1405                 /* set alternate 0 */
1406                 dev->alt = 0;
1407                 em28xx_videodbg("setting alternate 0\n");
1408                 errCode = usb_set_interface(dev->udev, 0, 0);
1409                 if (errCode < 0) {
1410                         em28xx_errdev("cannot change alternate number to "
1411                                         "0 (error=%i)\n", errCode);
1412                 }
1413         }
1414         kfree(fh);
1415         dev->users--;
1416         wake_up_interruptible_nr(&dev->open, 1);
1417         mutex_unlock(&dev->lock);
1418         return 0;
1419 }
1420
1421 /*
1422  * em28xx_v4l2_read()
1423  * will allocate buffers when called for the first time
1424  */
1425 static ssize_t
1426 em28xx_v4l2_read(struct file *filp, char __user * buf, size_t count,
1427                  loff_t * f_pos)
1428 {
1429         struct em28xx_frame_t *f, *i;
1430         unsigned long lock_flags;
1431         int ret = 0;
1432         struct em28xx_fh *fh = filp->private_data;
1433         struct em28xx *dev = fh->dev;
1434
1435         /* FIXME: read() is not prepared to allow changing the video
1436            resolution while streaming. Seems a bug at em28xx_set_fmt
1437          */
1438
1439         if (unlikely(res_get(fh) < 0))
1440                 return -EBUSY;
1441
1442         mutex_lock(&dev->lock);
1443
1444         if (dev->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1445                 em28xx_videodbg("V4l2_Buf_type_videocapture is set\n");
1446
1447         if (dev->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
1448                 em28xx_videodbg("V4L2_BUF_TYPE_VBI_CAPTURE is set\n");
1449                 em28xx_videodbg("not supported yet! ...\n");
1450                 if (copy_to_user(buf, "", 1)) {
1451                         mutex_unlock(&dev->lock);
1452                         return -EFAULT;
1453                 }
1454                 mutex_unlock(&dev->lock);
1455                 return (1);
1456         }
1457         if (dev->type == V4L2_BUF_TYPE_SLICED_VBI_CAPTURE) {
1458                 em28xx_videodbg("V4L2_BUF_TYPE_SLICED_VBI_CAPTURE is set\n");
1459                 em28xx_videodbg("not supported yet! ...\n");
1460                 if (copy_to_user(buf, "", 1)) {
1461                         mutex_unlock(&dev->lock);
1462                         return -EFAULT;
1463                 }
1464                 mutex_unlock(&dev->lock);
1465                 return (1);
1466         }
1467
1468         if (dev->state & DEV_DISCONNECTED) {
1469                 em28xx_videodbg("device not present\n");
1470                 mutex_unlock(&dev->lock);
1471                 return -ENODEV;
1472         }
1473
1474         if (dev->state & DEV_MISCONFIGURED) {
1475                 em28xx_videodbg("device misconfigured; close and open it again\n");
1476                 mutex_unlock(&dev->lock);
1477                 return -EIO;
1478         }
1479
1480         if (dev->io == IO_MMAP) {
1481                 em28xx_videodbg ("IO method is set to mmap; close and open"
1482                                 " the device again to choose the read method\n");
1483                 mutex_unlock(&dev->lock);
1484                 return -EINVAL;
1485         }
1486
1487         if (dev->io == IO_NONE) {
1488                 if (!em28xx_request_buffers(dev, EM28XX_NUM_READ_FRAMES)) {
1489                         em28xx_errdev("read failed, not enough memory\n");
1490                         mutex_unlock(&dev->lock);
1491                         return -ENOMEM;
1492                 }
1493                 dev->io = IO_READ;
1494                 dev->stream = STREAM_ON;
1495                 em28xx_queue_unusedframes(dev);
1496         }
1497
1498         if (!count) {
1499                 mutex_unlock(&dev->lock);
1500                 return 0;
1501         }
1502
1503         if (list_empty(&dev->outqueue)) {
1504                 if (filp->f_flags & O_NONBLOCK) {
1505                         mutex_unlock(&dev->lock);
1506                         return -EAGAIN;
1507                 }
1508                 ret = wait_event_interruptible
1509                     (dev->wait_frame,
1510                      (!list_empty(&dev->outqueue)) ||
1511                      (dev->state & DEV_DISCONNECTED));
1512                 if (ret) {
1513                         mutex_unlock(&dev->lock);
1514                         return ret;
1515                 }
1516                 if (dev->state & DEV_DISCONNECTED) {
1517                         mutex_unlock(&dev->lock);
1518                         return -ENODEV;
1519                 }
1520                 dev->video_bytesread = 0;
1521         }
1522
1523         f = list_entry(dev->outqueue.prev, struct em28xx_frame_t, frame);
1524
1525         em28xx_queue_unusedframes(dev);
1526
1527         if (count > f->buf.length)
1528                 count = f->buf.length;
1529
1530         if ((dev->video_bytesread + count) > dev->frame_size)
1531                 count = dev->frame_size - dev->video_bytesread;
1532
1533         if (copy_to_user(buf, f->bufmem+dev->video_bytesread, count)) {
1534                 em28xx_err("Error while copying to user\n");
1535                 return -EFAULT;
1536         }
1537         dev->video_bytesread += count;
1538
1539         if (dev->video_bytesread == dev->frame_size) {
1540                 spin_lock_irqsave(&dev->queue_lock, lock_flags);
1541                 list_for_each_entry(i, &dev->outqueue, frame)
1542                                     i->state = F_UNUSED;
1543                 INIT_LIST_HEAD(&dev->outqueue);
1544                 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
1545
1546                 em28xx_queue_unusedframes(dev);
1547                 dev->video_bytesread = 0;
1548         }
1549
1550         *f_pos += count;
1551
1552         mutex_unlock(&dev->lock);
1553
1554         return count;
1555 }
1556
1557 /*
1558  * em28xx_v4l2_poll()
1559  * will allocate buffers when called for the first time
1560  */
1561 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1562 {
1563         unsigned int mask = 0;
1564         struct em28xx_fh *fh = filp->private_data;
1565         struct em28xx *dev = fh->dev;
1566
1567         if (unlikely(res_get(fh) < 0))
1568                 return POLLERR;
1569
1570         mutex_lock(&dev->lock);
1571
1572         if (dev->state & DEV_DISCONNECTED) {
1573                 em28xx_videodbg("device not present\n");
1574         } else if (dev->state & DEV_MISCONFIGURED) {
1575                 em28xx_videodbg("device is misconfigured; close and open it again\n");
1576         } else {
1577                 if (dev->io == IO_NONE) {
1578                         if (!em28xx_request_buffers
1579                             (dev, EM28XX_NUM_READ_FRAMES)) {
1580                                 em28xx_warn
1581                                     ("poll() failed, not enough memory\n");
1582                         } else {
1583                                 dev->io = IO_READ;
1584                                 dev->stream = STREAM_ON;
1585                         }
1586                 }
1587
1588                 if (dev->io == IO_READ) {
1589                         em28xx_queue_unusedframes(dev);
1590                         poll_wait(filp, &dev->wait_frame, wait);
1591
1592                         if (!list_empty(&dev->outqueue))
1593                                 mask |= POLLIN | POLLRDNORM;
1594
1595                         mutex_unlock(&dev->lock);
1596
1597                         return mask;
1598                 }
1599         }
1600
1601         mutex_unlock(&dev->lock);
1602         return POLLERR;
1603 }
1604
1605 /*
1606  * em28xx_v4l2_mmap()
1607  */
1608 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1609 {
1610         struct em28xx_fh *fh    = filp->private_data;
1611         struct em28xx    *dev   = fh->dev;
1612         unsigned long    size   = vma->vm_end - vma->vm_start;
1613         unsigned long    start  = vma->vm_start;
1614         void             *pos;
1615         u32              i;
1616
1617         if (unlikely(res_get(fh) < 0))
1618                 return -EBUSY;
1619
1620         mutex_lock(&dev->lock);
1621
1622         if (dev->state & DEV_DISCONNECTED) {
1623                 em28xx_videodbg("mmap: device not present\n");
1624                 mutex_unlock(&dev->lock);
1625                 return -ENODEV;
1626         }
1627
1628         if (dev->state & DEV_MISCONFIGURED) {
1629                 em28xx_videodbg ("mmap: Device is misconfigured; close and "
1630                                                 "open it again\n");
1631                 mutex_unlock(&dev->lock);
1632                 return -EIO;
1633         }
1634
1635         if (dev->io != IO_MMAP || !(vma->vm_flags & VM_WRITE)) {
1636                 mutex_unlock(&dev->lock);
1637                 return -EINVAL;
1638         }
1639
1640         if (size > PAGE_ALIGN(dev->frame[0].buf.length))
1641                 size = PAGE_ALIGN(dev->frame[0].buf.length);
1642
1643         for (i = 0; i < dev->num_frames; i++) {
1644                 if ((dev->frame[i].buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
1645                         break;
1646         }
1647         if (i == dev->num_frames) {
1648                 em28xx_videodbg("mmap: user supplied mapping address is out of range\n");
1649                 mutex_unlock(&dev->lock);
1650                 return -EINVAL;
1651         }
1652
1653         /* VM_IO is eventually going to replace PageReserved altogether */
1654         vma->vm_flags |= VM_IO;
1655         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
1656
1657         pos = dev->frame[i].bufmem;
1658         while (size > 0) {      /* size is page-aligned */
1659                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1660                         em28xx_videodbg("mmap: vm_insert_page failed\n");
1661                         mutex_unlock(&dev->lock);
1662                         return -EAGAIN;
1663                 }
1664                 start += PAGE_SIZE;
1665                 pos += PAGE_SIZE;
1666                 size -= PAGE_SIZE;
1667         }
1668
1669         vma->vm_ops = &em28xx_vm_ops;
1670         vma->vm_private_data = &dev->frame[i];
1671
1672         em28xx_vm_open(vma);
1673         mutex_unlock(&dev->lock);
1674         return 0;
1675 }
1676
1677 static const struct file_operations em28xx_v4l_fops = {
1678         .owner         = THIS_MODULE,
1679         .open          = em28xx_v4l2_open,
1680         .release       = em28xx_v4l2_close,
1681         .read          = em28xx_v4l2_read,
1682         .poll          = em28xx_v4l2_poll,
1683         .mmap          = em28xx_v4l2_mmap,
1684         .ioctl         = video_ioctl2,
1685         .llseek        = no_llseek,
1686         .compat_ioctl  = v4l_compat_ioctl32,
1687 };
1688
1689 static const struct file_operations radio_fops = {
1690         .owner         = THIS_MODULE,
1691         .open          = em28xx_v4l2_open,
1692         .release       = em28xx_v4l2_close,
1693         .ioctl         = video_ioctl2,
1694         .compat_ioctl  = v4l_compat_ioctl32,
1695         .llseek        = no_llseek,
1696 };
1697
1698 static const struct video_device em28xx_video_template = {
1699         .fops                       = &em28xx_v4l_fops,
1700         .release                    = video_device_release,
1701
1702         .minor                      = -1,
1703         .vidioc_querycap            = vidioc_querycap,
1704         .vidioc_enum_fmt_cap        = vidioc_enum_fmt_cap,
1705         .vidioc_g_fmt_cap           = vidioc_g_fmt_cap,
1706         .vidioc_try_fmt_cap         = vidioc_try_fmt_cap,
1707         .vidioc_s_fmt_cap           = vidioc_s_fmt_cap,
1708         .vidioc_g_audio             = vidioc_g_audio,
1709         .vidioc_s_audio             = vidioc_s_audio,
1710         .vidioc_cropcap             = vidioc_cropcap,
1711
1712         .vidioc_g_fmt_vbi_capture   = vidioc_g_fmt_vbi_capture,
1713         .vidioc_try_fmt_vbi_capture = vidioc_try_set_vbi_capture,
1714         .vidioc_s_fmt_vbi_capture   = vidioc_try_set_vbi_capture,
1715
1716         .vidioc_reqbufs             = vidioc_reqbufs,
1717         .vidioc_querybuf            = vidioc_querybuf,
1718         .vidioc_qbuf                = vidioc_qbuf,
1719         .vidioc_dqbuf               = vidioc_dqbuf,
1720         .vidioc_s_std               = vidioc_s_std,
1721         .vidioc_enum_input          = vidioc_enum_input,
1722         .vidioc_g_input             = vidioc_g_input,
1723         .vidioc_s_input             = vidioc_s_input,
1724         .vidioc_queryctrl           = vidioc_queryctrl,
1725         .vidioc_g_ctrl              = vidioc_g_ctrl,
1726         .vidioc_s_ctrl              = vidioc_s_ctrl,
1727         .vidioc_streamon            = vidioc_streamon,
1728         .vidioc_streamoff           = vidioc_streamoff,
1729         .vidioc_g_tuner             = vidioc_g_tuner,
1730         .vidioc_s_tuner             = vidioc_s_tuner,
1731         .vidioc_g_frequency         = vidioc_g_frequency,
1732         .vidioc_s_frequency         = vidioc_s_frequency,
1733
1734         .tvnorms                    = V4L2_STD_ALL,
1735         .current_norm               = V4L2_STD_PAL,
1736 };
1737
1738 static struct video_device em28xx_radio_template = {
1739         .name                 = "em28xx-radio",
1740         .type                 = VID_TYPE_TUNER,
1741         .fops                 = &radio_fops,
1742         .minor                = -1,
1743         .vidioc_querycap      = radio_querycap,
1744         .vidioc_g_tuner       = radio_g_tuner,
1745         .vidioc_enum_input    = radio_enum_input,
1746         .vidioc_g_audio       = radio_g_audio,
1747         .vidioc_s_tuner       = radio_s_tuner,
1748         .vidioc_s_audio       = radio_s_audio,
1749         .vidioc_s_input       = radio_s_input,
1750         .vidioc_queryctrl     = radio_queryctrl,
1751         .vidioc_g_ctrl        = vidioc_g_ctrl,
1752         .vidioc_s_ctrl        = vidioc_s_ctrl,
1753         .vidioc_g_frequency   = vidioc_g_frequency,
1754         .vidioc_s_frequency   = vidioc_s_frequency,
1755 };
1756
1757 /******************************** usb interface *****************************************/
1758
1759
1760 static LIST_HEAD(em28xx_extension_devlist);
1761 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1762
1763 int em28xx_register_extension(struct em28xx_ops *ops)
1764 {
1765         struct em28xx *h, *dev = NULL;
1766
1767         list_for_each_entry(h, &em28xx_devlist, devlist)
1768                 dev = h;
1769
1770         mutex_lock(&em28xx_extension_devlist_lock);
1771         list_add_tail(&ops->next, &em28xx_extension_devlist);
1772         if (dev)
1773                 ops->init(dev);
1774
1775         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1776         mutex_unlock(&em28xx_extension_devlist_lock);
1777
1778         return 0;
1779 }
1780 EXPORT_SYMBOL(em28xx_register_extension);
1781
1782 void em28xx_unregister_extension(struct em28xx_ops *ops)
1783 {
1784         struct em28xx *h, *dev = NULL;
1785
1786         list_for_each_entry(h, &em28xx_devlist, devlist)
1787                 dev = h;
1788
1789         if (dev)
1790                 ops->fini(dev);
1791
1792         mutex_lock(&em28xx_extension_devlist_lock);
1793         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1794         list_del(&ops->next);
1795         mutex_unlock(&em28xx_extension_devlist_lock);
1796 }
1797 EXPORT_SYMBOL(em28xx_unregister_extension);
1798
1799 struct video_device *em28xx_vdev_init(struct em28xx *dev,
1800                                       const struct video_device *template,
1801                                       const int type,
1802                                       const char *type_name)
1803 {
1804         struct video_device *vfd;
1805
1806         vfd = video_device_alloc();
1807         if (NULL == vfd)
1808                 return NULL;
1809         *vfd = *template;
1810         vfd->minor   = -1;
1811         vfd->dev = &dev->udev->dev;
1812         vfd->release = video_device_release;
1813         vfd->type = type;
1814
1815         snprintf(vfd->name, sizeof(vfd->name), "%s %s",
1816                  dev->name, type_name);
1817
1818         return vfd;
1819 }
1820
1821
1822 /*
1823  * em28xx_init_dev()
1824  * allocates and inits the device structs, registers i2c bus and v4l device
1825  */
1826 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1827                            int minor)
1828 {
1829         struct em28xx_ops *ops = NULL;
1830         struct em28xx *dev = *devhandle;
1831         int retval = -ENOMEM;
1832         int errCode;
1833         unsigned int maxh, maxw;
1834
1835         dev->udev = udev;
1836         mutex_init(&dev->lock);
1837         spin_lock_init(&dev->queue_lock);
1838         init_waitqueue_head(&dev->open);
1839         init_waitqueue_head(&dev->wait_frame);
1840         init_waitqueue_head(&dev->wait_stream);
1841
1842         dev->em28xx_write_regs = em28xx_write_regs;
1843         dev->em28xx_read_reg = em28xx_read_reg;
1844         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1845         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1846         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1847         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1848
1849         errCode = em28xx_read_reg(dev, CHIPID_REG);
1850         if (errCode >= 0)
1851                 em28xx_info("em28xx chip ID = %d\n", errCode);
1852
1853         em28xx_pre_card_setup(dev);
1854
1855         errCode = em28xx_config(dev);
1856         if (errCode) {
1857                 em28xx_errdev("error configuring device\n");
1858                 em28xx_devused &= ~(1<<dev->devno);
1859                 kfree(dev);
1860                 return -ENOMEM;
1861         }
1862
1863         /* register i2c bus */
1864         em28xx_i2c_register(dev);
1865
1866         /* Do board specific init and eeprom reading */
1867         em28xx_card_setup(dev);
1868
1869         /* Configure audio */
1870         em28xx_audio_analog_set(dev);
1871
1872         /* configure the device */
1873         em28xx_config_i2c(dev);
1874
1875         /* set default norm */
1876         dev->norm = em28xx_video_template.current_norm;
1877
1878         maxw = norm_maxw(dev);
1879         maxh = norm_maxh(dev);
1880
1881         /* set default image size */
1882         dev->width = maxw;
1883         dev->height = maxh;
1884         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1885         dev->field_size = dev->width * dev->height;
1886         dev->frame_size =
1887             dev->interlaced ? dev->field_size << 1 : dev->field_size;
1888         dev->bytesperline = dev->width * 2;
1889         dev->hscale = 0;
1890         dev->vscale = 0;
1891         dev->ctl_input = 2;
1892
1893         errCode = em28xx_config(dev);
1894
1895         list_add_tail(&dev->devlist, &em28xx_devlist);
1896
1897         /* allocate and fill video video_device struct */
1898         dev->vdev = em28xx_vdev_init(dev, &em28xx_video_template,
1899                                           VID_TYPE_CAPTURE, "video");
1900         if (NULL == dev->vdev) {
1901                 em28xx_errdev("cannot allocate video_device.\n");
1902                 goto fail_unreg;
1903         }
1904         if (dev->tuner_type != TUNER_ABSENT)
1905                 dev->vdev->type |= VID_TYPE_TUNER;
1906
1907         /* register v4l2 video video_device */
1908         retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1909                                        video_nr[dev->devno]);
1910         if (retval) {
1911                 em28xx_errdev("unable to register video device (error=%i).\n",
1912                               retval);
1913                 goto fail_unreg;
1914         }
1915
1916         /* Allocate and fill vbi video_device struct */
1917         dev->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
1918                                           VFL_TYPE_VBI, "vbi");
1919         /* register v4l2 vbi video_device */
1920         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1921                                         vbi_nr[dev->devno]) < 0) {
1922                 em28xx_errdev("unable to register vbi device\n");
1923                 retval = -ENODEV;
1924                 goto fail_unreg;
1925         }
1926
1927         if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
1928                 dev->radio_dev = em28xx_vdev_init(dev, &em28xx_radio_template,
1929                                         VFL_TYPE_RADIO, "radio");
1930                 if (NULL == dev->radio_dev) {
1931                         em28xx_errdev("cannot allocate video_device.\n");
1932                         goto fail_unreg;
1933                 }
1934                 retval = video_register_device(dev->radio_dev, VFL_TYPE_RADIO,
1935                                             radio_nr[dev->devno]);
1936                 if (retval < 0) {
1937                         em28xx_errdev("can't register radio device\n");
1938                         goto fail_unreg;
1939                 }
1940                 em28xx_info("Registered radio device as /dev/radio%d\n",
1941                             dev->radio_dev->minor & 0x1f);
1942         }
1943
1944
1945         if (dev->has_msp34xx) {
1946                 /* Send a reset to other chips via gpio */
1947                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
1948                 msleep(3);
1949                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
1950                 msleep(3);
1951         }
1952
1953         video_mux(dev, 0);
1954
1955         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
1956                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1957                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1958
1959         mutex_lock(&em28xx_extension_devlist_lock);
1960         if (!list_empty(&em28xx_extension_devlist)) {
1961                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1962                         if (ops->id)
1963                                 ops->init(dev);
1964                 }
1965         }
1966         mutex_unlock(&em28xx_extension_devlist_lock);
1967
1968         return 0;
1969
1970 fail_unreg:
1971         em28xx_release_resources(dev);
1972         mutex_unlock(&dev->lock);
1973         kfree(dev);
1974         return retval;
1975 }
1976
1977 #if defined(CONFIG_MODULES) && defined(MODULE)
1978 static void request_module_async(struct work_struct *work)
1979 {
1980         struct em28xx *dev = container_of(work,
1981                              struct em28xx, request_module_wk);
1982
1983         if (dev->has_audio_class)
1984                 request_module("snd-usb-audio");
1985         else
1986                 request_module("em28xx-alsa");
1987 }
1988
1989 static void request_modules(struct em28xx *dev)
1990 {
1991         INIT_WORK(&dev->request_module_wk, request_module_async);
1992         schedule_work(&dev->request_module_wk);
1993 }
1994 #else
1995 #define request_modules(dev)
1996 #endif /* CONFIG_MODULES */
1997
1998 /*
1999  * em28xx_usb_probe()
2000  * checks for supported devices
2001  */
2002 static int em28xx_usb_probe(struct usb_interface *interface,
2003                             const struct usb_device_id *id)
2004 {
2005         const struct usb_endpoint_descriptor *endpoint;
2006         struct usb_device *udev;
2007         struct usb_interface *uif;
2008         struct em28xx *dev = NULL;
2009         int retval = -ENODEV;
2010         int i, nr, ifnum;
2011
2012         udev = usb_get_dev(interface_to_usbdev(interface));
2013         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
2014
2015         /* Check to see next free device and mark as used */
2016         nr=find_first_zero_bit(&em28xx_devused,EM28XX_MAXBOARDS);
2017         em28xx_devused|=1<<nr;
2018
2019         /* Don't register audio interfaces */
2020         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2021                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
2022                                 udev->descriptor.idVendor,udev->descriptor.idProduct,
2023                                 ifnum,
2024                                 interface->altsetting[0].desc.bInterfaceClass);
2025
2026                 em28xx_devused&=~(1<<nr);
2027                 return -ENODEV;
2028         }
2029
2030         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
2031                         udev->descriptor.idVendor,udev->descriptor.idProduct,
2032                         ifnum,
2033                         interface->altsetting[0].desc.bInterfaceClass);
2034
2035         endpoint = &interface->cur_altsetting->endpoint[1].desc;
2036
2037         /* check if the device has the iso in endpoint at the correct place */
2038         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2039             USB_ENDPOINT_XFER_ISOC) {
2040                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
2041                 em28xx_devused&=~(1<<nr);
2042                 return -ENODEV;
2043         }
2044         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
2045                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
2046                 em28xx_devused&=~(1<<nr);
2047                 return -ENODEV;
2048         }
2049
2050         if (nr >= EM28XX_MAXBOARDS) {
2051                 printk (DRIVER_NAME ": Supports only %i em28xx boards.\n",EM28XX_MAXBOARDS);
2052                 em28xx_devused&=~(1<<nr);
2053                 return -ENOMEM;
2054         }
2055
2056         /* allocate memory for our device state and initialize it */
2057         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2058         if (dev == NULL) {
2059                 em28xx_err(DRIVER_NAME ": out of memory!\n");
2060                 em28xx_devused&=~(1<<nr);
2061                 return -ENOMEM;
2062         }
2063
2064         snprintf(dev->name, 29, "em28xx #%d", nr);
2065         dev->devno = nr;
2066         dev->model = id->driver_info;
2067
2068         /* Checks if audio is provided by some interface */
2069         for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
2070                 uif = udev->config->interface[i];
2071                 if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2072                         dev->has_audio_class = 1;
2073                         break;
2074                 }
2075         }
2076
2077         printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
2078                    dev->has_audio_class ? "Has" : "Doesn't have");
2079
2080         /* compute alternate max packet sizes */
2081         uif = udev->actconfig->interface[0];
2082
2083         dev->num_alt=uif->num_altsetting;
2084         em28xx_info("Alternate settings: %i\n",dev->num_alt);
2085 //      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)*
2086         dev->alt_max_pkt_size = kmalloc(32*
2087                                                 dev->num_alt,GFP_KERNEL);
2088         if (dev->alt_max_pkt_size == NULL) {
2089                 em28xx_errdev("out of memory!\n");
2090                 em28xx_devused&=~(1<<nr);
2091                 kfree(dev);
2092                 return -ENOMEM;
2093         }
2094
2095         for (i = 0; i < dev->num_alt ; i++) {
2096                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
2097                                                         wMaxPacketSize);
2098                 dev->alt_max_pkt_size[i] =
2099                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
2100                 em28xx_info("Alternate setting %i, max size= %i\n",i,
2101                                                         dev->alt_max_pkt_size[i]);
2102         }
2103
2104         if ((card[nr]>=0)&&(card[nr]<em28xx_bcount))
2105                 dev->model = card[nr];
2106
2107         /* allocate device struct */
2108         retval = em28xx_init_dev(&dev, udev, nr);
2109         if (retval)
2110                 return retval;
2111
2112         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
2113
2114         /* save our data pointer in this interface device */
2115         usb_set_intfdata(interface, dev);
2116
2117         request_modules(dev);
2118
2119         return 0;
2120 }
2121
2122 /*
2123  * em28xx_usb_disconnect()
2124  * called when the device gets diconencted
2125  * video device will be unregistered on v4l2_close in case it is still open
2126  */
2127 static void em28xx_usb_disconnect(struct usb_interface *interface)
2128 {
2129         struct em28xx *dev;
2130         struct em28xx_ops *ops = NULL;
2131
2132         dev = usb_get_intfdata(interface);
2133         usb_set_intfdata(interface, NULL);
2134
2135         if (!dev)
2136                 return;
2137
2138         em28xx_info("disconnecting %s\n", dev->vdev->name);
2139
2140         /* wait until all current v4l2 io is finished then deallocate resources */
2141         mutex_lock(&dev->lock);
2142
2143         wake_up_interruptible_all(&dev->open);
2144
2145         if (dev->users) {
2146                 em28xx_warn
2147                     ("device /dev/video%d is open! Deregistration and memory "
2148                      "deallocation are deferred on close.\n",
2149                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
2150
2151                 dev->state |= DEV_MISCONFIGURED;
2152                 em28xx_uninit_isoc(dev);
2153                 dev->state |= DEV_DISCONNECTED;
2154                 wake_up_interruptible(&dev->wait_frame);
2155                 wake_up_interruptible(&dev->wait_stream);
2156         } else {
2157                 dev->state |= DEV_DISCONNECTED;
2158                 em28xx_release_resources(dev);
2159         }
2160         mutex_unlock(&dev->lock);
2161
2162         mutex_lock(&em28xx_extension_devlist_lock);
2163         if (!list_empty(&em28xx_extension_devlist)) {
2164                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2165                         ops->fini(dev);
2166                 }
2167         }
2168         mutex_unlock(&em28xx_extension_devlist_lock);
2169
2170         if (!dev->users) {
2171                 kfree(dev->alt_max_pkt_size);
2172                 kfree(dev);
2173         }
2174 }
2175
2176 static struct usb_driver em28xx_usb_driver = {
2177         .name = "em28xx",
2178         .probe = em28xx_usb_probe,
2179         .disconnect = em28xx_usb_disconnect,
2180         .id_table = em28xx_id_table,
2181 };
2182
2183 static int __init em28xx_module_init(void)
2184 {
2185         int result;
2186
2187         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
2188                (EM28XX_VERSION_CODE >> 16) & 0xff,
2189                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
2190 #ifdef SNAPSHOT
2191         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
2192                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
2193 #endif
2194
2195         /* register this driver with the USB subsystem */
2196         result = usb_register(&em28xx_usb_driver);
2197         if (result)
2198                 em28xx_err(DRIVER_NAME
2199                            " usb_register failed. Error number %d.\n", result);
2200
2201         return result;
2202 }
2203
2204 static void __exit em28xx_module_exit(void)
2205 {
2206         /* deregister this driver with the USB subsystem */
2207         usb_deregister(&em28xx_usb_driver);
2208 }
2209
2210 module_init(em28xx_module_init);
2211 module_exit(em28xx_module_exit);