drivers/media/video/em28xx/em28xx-video.c

   1 /*
   2    em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
   3                     video capture devices
   4
   5    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   6                       Markus Rechberger <mrechberger@gmail.com>
   7                       Mauro Carvalho Chehab <mchehab@infradead.org>
   8                       Sascha Sommer <saschasommer@freenet.de>
   9
  10         Some parts based on SN9C10x PC Camera Controllers GPL driver made
  11                 by Luca Risolia <luca.risolia@studio.unibo.it>
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 2 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, write to the Free Software
  25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/init.h>
  29 #include <linux/list.h>
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/bitmap.h>
  33 #include <linux/usb.h>
  34 #include <linux/i2c.h>
  35 #include <linux/version.h>
  36 #include <linux/mm.h>
  37 #include <linux/mutex.h>
  38
  39 #include "em28xx.h"
  40 #include <media/v4l2-common.h>
  41 #include <media/msp3400.h>
  42 #include <media/tuner.h>
  43
  44 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  45                       "Markus Rechberger <mrechberger@gmail.com>, " \
  46                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  47                       "Sascha Sommer <saschasommer@freenet.de>"
  48
  49 #define DRIVER_NAME         "em28xx"
  50 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
  51 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 1, 0)
  52
  53 #define em28xx_videodbg(fmt, arg...) do {\
  54         if (video_debug) \
  55                 printk(KERN_INFO "%s %s :"fmt, \
  56                          dev->name, __func__ , ##arg); } while (0)
  57
  58 static unsigned int isoc_debug;
  59 module_param(isoc_debug, int, 0644);
  60 MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
  61
  62 #define em28xx_isocdbg(fmt, arg...) \
  63 do {\
  64         if (isoc_debug) { \
  65                 printk(KERN_INFO "%s %s :"fmt, \
  66                          dev->name, __func__ , ##arg); \
  67         } \
  68   } while (0)
  69
  70 MODULE_AUTHOR(DRIVER_AUTHOR);
  71 MODULE_DESCRIPTION(DRIVER_DESC);
  72 MODULE_LICENSE("GPL");
  73
  74 static LIST_HEAD(em28xx_devlist);
  75
  76 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  77 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  78 static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  79 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
  80
  81 module_param_array(card,  int, NULL, 0444);
  82 module_param_array(video_nr, int, NULL, 0444);
  83 module_param_array(vbi_nr, int, NULL, 0444);
  84 module_param_array(radio_nr, int, NULL, 0444);
  85 MODULE_PARM_DESC(card,     "card type");
  86 MODULE_PARM_DESC(video_nr, "video device numbers");
  87 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
  88 MODULE_PARM_DESC(radio_nr, "radio device numbers");
  89
  90 static unsigned int video_debug;
  91 module_param(video_debug, int, 0644);
  92 MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
  93
  94 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
  95 static unsigned long em28xx_devused;
  96
  97 /* supported controls */
  98 /* Common to all boards */
  99 static struct v4l2_queryctrl em28xx_qctrl[] = {
 100         {
 101                 .id = V4L2_CID_AUDIO_VOLUME,
 102                 .type = V4L2_CTRL_TYPE_INTEGER,
 103                 .name = "Volume",
 104                 .minimum = 0x0,
 105                 .maximum = 0x1f,
 106                 .step = 0x1,
 107                 .default_value = 0x1f,
 108                 .flags = 0,
 109         }, {
 110                 .id = V4L2_CID_AUDIO_MUTE,
 111                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 112                 .name = "Mute",
 113                 .minimum = 0,
 114                 .maximum = 1,
 115                 .step = 1,
 116                 .default_value = 1,
 117                 .flags = 0,
 118         }
 119 };
 120
 121 static struct usb_driver em28xx_usb_driver;
 122
 123 /* ------------------------------------------------------------------
 124         DMA and thread functions
 125    ------------------------------------------------------------------*/
 126
 127 /*
 128  * Announces that a buffer were filled and request the next
 129  */
 130 static inline void buffer_filled(struct em28xx *dev,
 131                                   struct em28xx_dmaqueue *dma_q,
 132                                   struct em28xx_buffer *buf)
 133 {
 134         /* Advice that buffer was filled */
 135         em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
 136         buf->vb.state = VIDEOBUF_DONE;
 137         buf->vb.field_count++;
 138         do_gettimeofday(&buf->vb.ts);
 139
 140         dev->isoc_ctl.buf = NULL;
 141
 142         list_del(&buf->vb.queue);
 143         wake_up(&buf->vb.done);
 144 }
 145
 146 /*
 147  * Identify the buffer header type and properly handles
 148  */
 149 static void em28xx_copy_video(struct em28xx *dev,
 150                               struct em28xx_dmaqueue  *dma_q,
 151                               struct em28xx_buffer *buf,
 152                               unsigned char *p,
 153                               unsigned char *outp, unsigned long len)
 154 {
 155         void *fieldstart, *startwrite, *startread;
 156         int  linesdone, currlinedone, offset, lencopy, remain;
 157         int bytesperline = dev->width << 1;
 158
 159         if (dma_q->pos + len > buf->vb.size)
 160                 len = buf->vb.size - dma_q->pos;
 161
 162         if (p[0] != 0x88 && p[0] != 0x22) {
 163                 em28xx_isocdbg("frame is not complete\n");
 164                 len += 4;
 165         } else
 166                 p += 4;
 167
 168         startread = p;
 169         remain = len;
 170
 171         /* Interlaces frame */
 172         if (buf->top_field)
 173                 fieldstart = outp;
 174         else
 175                 fieldstart = outp + bytesperline;
 176
 177         linesdone = dma_q->pos / bytesperline;
 178         currlinedone = dma_q->pos % bytesperline;
 179         offset = linesdone * bytesperline * 2 + currlinedone;
 180         startwrite = fieldstart + offset;
 181         lencopy = bytesperline - currlinedone;
 182         lencopy = lencopy > remain ? remain : lencopy;
 183
 184         if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
 185                 em28xx_isocdbg("Overflow of %zi bytes past buffer end (1)\n",
 186                                ((char *)startwrite + lencopy) -
 187                                ((char *)outp + buf->vb.size));
 188                 lencopy = remain = (char *)outp + buf->vb.size - (char *)startwrite;
 189         }
 190         if (lencopy <= 0)
 191                 return;
 192         memcpy(startwrite, startread, lencopy);
 193
 194         remain -= lencopy;
 195
 196         while (remain > 0) {
 197                 startwrite += lencopy + bytesperline;
 198                 startread += lencopy;
 199                 if (bytesperline > remain)
 200                         lencopy = remain;
 201                 else
 202                         lencopy = bytesperline;
 203
 204                 if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
 205                         em28xx_isocdbg("Overflow of %zi bytes past buffer end (2)\n",
 206                                        ((char *)startwrite + lencopy) -
 207                                        ((char *)outp + buf->vb.size));
 208                         lencopy = remain = (char *)outp + buf->vb.size -
 209                                            (char *)startwrite;
 210                 }
 211                 if (lencopy <= 0)
 212                         break;
 213
 214                 memcpy(startwrite, startread, lencopy);
 215
 216                 remain -= lencopy;
 217         }
 218
 219         dma_q->pos += len;
 220 }
 221
 222 static inline void print_err_status(struct em28xx *dev,
 223                                      int packet, int status)
 224 {
 225         char *errmsg = "Unknown";
 226
 227         switch (status) {
 228         case -ENOENT:
 229                 errmsg = "unlinked synchronuously";
 230                 break;
 231         case -ECONNRESET:
 232                 errmsg = "unlinked asynchronuously";
 233                 break;
 234         case -ENOSR:
 235                 errmsg = "Buffer error (overrun)";
 236                 break;
 237         case -EPIPE:
 238                 errmsg = "Stalled (device not responding)";
 239                 break;
 240         case -EOVERFLOW:
 241                 errmsg = "Babble (bad cable?)";
 242                 break;
 243         case -EPROTO:
 244                 errmsg = "Bit-stuff error (bad cable?)";
 245                 break;
 246         case -EILSEQ:
 247                 errmsg = "CRC/Timeout (could be anything)";
 248                 break;
 249         case -ETIME:
 250                 errmsg = "Device does not respond";
 251                 break;
 252         }
 253         if (packet < 0) {
 254                 em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
 255         } else {
 256                 em28xx_isocdbg("URB packet %d, status %d [%s].\n",
 257                                packet, status, errmsg);
 258         }
 259 }
 260
 261 /*
 262  * video-buf generic routine to get the next available buffer
 263  */
 264 static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
 265                                           struct em28xx_buffer **buf)
 266 {
 267         struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
 268         char *outp;
 269
 270         if (list_empty(&dma_q->active)) {
 271                 em28xx_isocdbg("No active queue to serve\n");
 272                 dev->isoc_ctl.buf = NULL;
 273                 *buf = NULL;
 274                 return;
 275         }
 276
 277         /* Get the next buffer */
 278         *buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
 279
 280         /* Cleans up buffer - Usefull for testing for frame/URB loss */
 281         outp = videobuf_to_vmalloc(&(*buf)->vb);
 282         memset(outp, 0, (*buf)->vb.size);
 283
 284         dev->isoc_ctl.buf = *buf;
 285
 286         return;
 287 }
 288
 289 /*
 290  * Controls the isoc copy of each urb packet
 291  */
 292 static inline int em28xx_isoc_copy(struct em28xx *dev, struct urb *urb)
 293 {
 294         struct em28xx_buffer    *buf;
 295         struct em28xx_dmaqueue  *dma_q = urb->context;
 296         unsigned char *outp = NULL;
 297         int i, len = 0, rc = 1;
 298         unsigned char *p;
 299
 300         if (!dev)
 301                 return 0;
 302
 303         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
 304                 return 0;
 305
 306         if (urb->status < 0) {
 307                 print_err_status(dev, -1, urb->status);
 308                 if (urb->status == -ENOENT)
 309                         return 0;
 310         }
 311
 312         buf = dev->isoc_ctl.buf;
 313         if (buf != NULL)
 314                 outp = videobuf_to_vmalloc(&buf->vb);
 315
 316         for (i = 0; i < urb->number_of_packets; i++) {
 317                 int status = urb->iso_frame_desc[i].status;
 318
 319                 if (status < 0) {
 320                         print_err_status(dev, i, status);
 321                         if (urb->iso_frame_desc[i].status != -EPROTO)
 322                                 continue;
 323                 }
 324
 325                 len = urb->iso_frame_desc[i].actual_length - 4;
 326
 327                 if (urb->iso_frame_desc[i].actual_length <= 0) {
 328                         /* em28xx_isocdbg("packet %d is empty",i); - spammy */
 329                         continue;
 330                 }
 331                 if (urb->iso_frame_desc[i].actual_length >
 332                                                 dev->max_pkt_size) {
 333                         em28xx_isocdbg("packet bigger than packet size");
 334                         continue;
 335                 }
 336
 337                 p = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 338
 339                 /* FIXME: incomplete buffer checks where removed to make
 340                    logic simpler. Impacts of those changes should be evaluated
 341                  */
 342                 if (p[0] == 0x33 && p[1] == 0x95 && p[2] == 0x00) {
 343                         em28xx_isocdbg("VBI HEADER!!!\n");
 344                         /* FIXME: Should add vbi copy */
 345                         continue;
 346                 }
 347                 if (p[0] == 0x22 && p[1] == 0x5a) {
 348                         em28xx_isocdbg("Video frame %d, length=%i, %s\n", p[2],
 349                                        len, (p[2] & 1)? "odd" : "even");
 350
 351                         if (!(p[2] & 1)) {
 352                                 if (buf != NULL)
 353                                         buffer_filled(dev, dma_q, buf);
 354                                 get_next_buf(dma_q, &buf);
 355                                 if (buf == NULL)
 356                                         outp = NULL;
 357                                 else
 358                                         outp = videobuf_to_vmalloc(&buf->vb);
 359                         }
 360
 361                         if (buf != NULL) {
 362                                 if (p[2] & 1)
 363                                         buf->top_field = 0;
 364                                 else
 365                                         buf->top_field = 1;
 366                         }
 367
 368                         dma_q->pos = 0;
 369                 }
 370                 if (buf != NULL)
 371                         em28xx_copy_video(dev, dma_q, buf, p, outp, len);
 372         }
 373         return rc;
 374 }
 375
 376 /* ------------------------------------------------------------------
 377         Videobuf operations
 378    ------------------------------------------------------------------*/
 379
 380 static int
 381 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 382 {
 383         struct em28xx_fh *fh = vq->priv_data;
 384         struct em28xx        *dev = fh->dev;
 385         struct v4l2_frequency f;
 386
 387         *size = 16 * fh->dev->width * fh->dev->height >> 3;
 388         if (0 == *count)
 389                 *count = EM28XX_DEF_BUF;
 390
 391         if (*count < EM28XX_MIN_BUF)
 392                 *count = EM28XX_MIN_BUF;
 393
 394         /* Ask tuner to go to analog mode */
 395         memset(&f, 0, sizeof(f));
 396         f.frequency = dev->ctl_freq;
 397
 398         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
 399
 400         return 0;
 401 }
 402
 403 /* This is called *without* dev->slock held; please keep it that way */
 404 static void free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
 405 {
 406         struct em28xx_fh     *fh  = vq->priv_data;
 407         struct em28xx        *dev = fh->dev;
 408         unsigned long flags = 0;
 409         if (in_interrupt())
 410                 BUG();
 411
 412         /* We used to wait for the buffer to finish here, but this didn't work
 413            because, as we were keeping the state as VIDEOBUF_QUEUED,
 414            videobuf_queue_cancel marked it as finished for us.
 415            (Also, it could wedge forever if the hardware was misconfigured.)
 416
 417            This should be safe; by the time we get here, the buffer isn't
 418            queued anymore. If we ever start marking the buffers as
 419            VIDEOBUF_ACTIVE, it won't be, though.
 420         */
 421         spin_lock_irqsave(&dev->slock, flags);
 422         if (dev->isoc_ctl.buf == buf)
 423                 dev->isoc_ctl.buf = NULL;
 424         spin_unlock_irqrestore(&dev->slock, flags);
 425
 426         videobuf_vmalloc_free(&buf->vb);
 427         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 428 }
 429
 430 static int
 431 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 432                                                 enum v4l2_field field)
 433 {
 434         struct em28xx_fh     *fh  = vq->priv_data;
 435         struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
 436         struct em28xx        *dev = fh->dev;
 437         int                  rc = 0, urb_init = 0;
 438
 439         /* FIXME: It assumes depth = 16 */
 440         /* The only currently supported format is 16 bits/pixel */
 441         buf->vb.size = 16 * dev->width * dev->height >> 3;
 442
 443         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 444                 return -EINVAL;
 445
 446         buf->vb.width  = dev->width;
 447         buf->vb.height = dev->height;
 448         buf->vb.field  = field;
 449
 450         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 451                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 452                 if (rc < 0)
 453                         goto fail;
 454         }
 455
 456         if (!dev->isoc_ctl.num_bufs)
 457                 urb_init = 1;
 458
 459         if (urb_init) {
 460                 rc = em28xx_init_isoc(dev, EM28XX_NUM_PACKETS,
 461                                       EM28XX_NUM_BUFS, dev->max_pkt_size,
 462                                       em28xx_isoc_copy);
 463                 if (rc < 0)
 464                         goto fail;
 465         }
 466
 467         buf->vb.state = VIDEOBUF_PREPARED;
 468         return 0;
 469
 470 fail:
 471         free_buffer(vq, buf);
 472         return rc;
 473 }
 474
 475 static void
 476 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 477 {
 478         struct em28xx_buffer    *buf     = container_of(vb, struct em28xx_buffer, vb);
 479         struct em28xx_fh        *fh      = vq->priv_data;
 480         struct em28xx           *dev     = fh->dev;
 481         struct em28xx_dmaqueue  *vidq    = &dev->vidq;
 482
 483         buf->vb.state = VIDEOBUF_QUEUED;
 484         list_add_tail(&buf->vb.queue, &vidq->active);
 485
 486 }
 487
 488 static void buffer_release(struct videobuf_queue *vq,
 489                                 struct videobuf_buffer *vb)
 490 {
 491         struct em28xx_buffer   *buf  = container_of(vb, struct em28xx_buffer, vb);
 492         struct em28xx_fh       *fh   = vq->priv_data;
 493         struct em28xx          *dev  = (struct em28xx *)fh->dev;
 494
 495         em28xx_isocdbg("em28xx: called buffer_release\n");
 496
 497         free_buffer(vq, buf);
 498 }
 499
 500 static struct videobuf_queue_ops em28xx_video_qops = {
 501         .buf_setup      = buffer_setup,
 502         .buf_prepare    = buffer_prepare,
 503         .buf_queue      = buffer_queue,
 504         .buf_release    = buffer_release,
 505 };
 506
 507 /*********************  v4l2 interface  **************************************/
 508
 509 /*
 510  * em28xx_config()
 511  * inits registers with sane defaults
 512  */
 513 static int em28xx_config(struct em28xx *dev)
 514 {
 515
 516         /* Sets I2C speed to 100 KHz */
 517         if (!dev->is_em2800)
 518                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
 519
 520         /* enable vbi capturing */
 521
 522 /*      em28xx_write_regs_req(dev, 0x00, 0x0e, "\xC0", 1); audio register */
 523 /*      em28xx_write_regs_req(dev, 0x00, 0x0f, "\x80", 1); clk register */
 524         em28xx_write_regs_req(dev, 0x00, 0x11, "\x51", 1);
 525
 526         dev->mute = 1;          /* maybe not the right place... */
 527         dev->volume = 0x1f;
 528
 529         em28xx_outfmt_set_yuv422(dev);
 530         em28xx_colorlevels_set_default(dev);
 531         em28xx_compression_disable(dev);
 532
 533         return 0;
 534 }
 535
 536 /*
 537  * em28xx_config_i2c()
 538  * configure i2c attached devices
 539  */
 540 static void em28xx_config_i2c(struct em28xx *dev)
 541 {
 542         struct v4l2_routing route;
 543
 544         route.input = INPUT(dev->ctl_input)->vmux;
 545         route.output = 0;
 546         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
 547         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 548         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
 549 }
 550
 551 static void video_mux(struct em28xx *dev, int index)
 552 {
 553         struct v4l2_routing route;
 554
 555         route.input = INPUT(index)->vmux;
 556         route.output = 0;
 557         dev->ctl_input = index;
 558         dev->ctl_ainput = INPUT(index)->amux;
 559
 560         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
 561
 562         if (dev->has_msp34xx) {
 563                 if (dev->i2s_speed) {
 564                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ,
 565                                 &dev->i2s_speed);
 566                 }
 567                 route.input = dev->ctl_ainput;
 568                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
 569                 /* Note: this is msp3400 specific */
 570                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING,
 571                         &route);
 572         }
 573
 574         em28xx_audio_analog_set(dev);
 575 }
 576
 577 /* Usage lock check functions */
 578 static int res_get(struct em28xx_fh *fh)
 579 {
 580         struct em28xx    *dev = fh->dev;
 581         int              rc   = 0;
 582
 583         /* This instance already has stream_on */
 584         if (fh->stream_on)
 585                 return rc;
 586
 587         if (dev->stream_on)
 588                 return -EINVAL;
 589
 590         mutex_lock(&dev->lock);
 591         dev->stream_on = 1;
 592         fh->stream_on  = 1;
 593         mutex_unlock(&dev->lock);
 594         return rc;
 595 }
 596
 597 static int res_check(struct em28xx_fh *fh)
 598 {
 599         return (fh->stream_on);
 600 }
 601
 602 static void res_free(struct em28xx_fh *fh)
 603 {
 604         struct em28xx    *dev = fh->dev;
 605
 606         mutex_lock(&dev->lock);
 607         fh->stream_on = 0;
 608         dev->stream_on = 0;
 609         mutex_unlock(&dev->lock);
 610 }
 611
 612 /*
 613  * em28xx_get_ctrl()
 614  * return the current saturation, brightness or contrast, mute state
 615  */
 616 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
 617 {
 618         switch (ctrl->id) {
 619         case V4L2_CID_AUDIO_MUTE:
 620                 ctrl->value = dev->mute;
 621                 return 0;
 622         case V4L2_CID_AUDIO_VOLUME:
 623                 ctrl->value = dev->volume;
 624                 return 0;
 625         default:
 626                 return -EINVAL;
 627         }
 628 }
 629
 630 /*
 631  * em28xx_set_ctrl()
 632  * mute or set new saturation, brightness or contrast
 633  */
 634 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
 635 {
 636         switch (ctrl->id) {
 637         case V4L2_CID_AUDIO_MUTE:
 638                 if (ctrl->value != dev->mute) {
 639                         dev->mute = ctrl->value;
 640                         return em28xx_audio_analog_set(dev);
 641                 }
 642                 return 0;
 643         case V4L2_CID_AUDIO_VOLUME:
 644                 dev->volume = ctrl->value;
 645                 return em28xx_audio_analog_set(dev);
 646         default:
 647                 return -EINVAL;
 648         }
 649 }
 650
 651 static int check_dev(struct em28xx *dev)
 652 {
 653         if (dev->state & DEV_DISCONNECTED) {
 654                 em28xx_errdev("v4l2 ioctl: device not present\n");
 655                 return -ENODEV;
 656         }
 657
 658         if (dev->state & DEV_MISCONFIGURED) {
 659                 em28xx_errdev("v4l2 ioctl: device is misconfigured; "
 660                               "close and open it again\n");
 661                 return -EIO;
 662         }
 663         return 0;
 664 }
 665
 666 static void get_scale(struct em28xx *dev,
 667                         unsigned int width, unsigned int height,
 668                         unsigned int *hscale, unsigned int *vscale)
 669 {
 670         unsigned int          maxw   = norm_maxw(dev);
 671         unsigned int          maxh   = norm_maxh(dev);
 672
 673         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
 674         if (*hscale >= 0x4000)
 675                 *hscale = 0x3fff;
 676
 677         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
 678         if (*vscale >= 0x4000)
 679                 *vscale = 0x3fff;
 680 }
 681
 682 /* ------------------------------------------------------------------
 683         IOCTL vidioc handling
 684    ------------------------------------------------------------------*/
 685
 686 static int vidioc_g_fmt_cap(struct file *file, void *priv,
 687                                         struct v4l2_format *f)
 688 {
 689         struct em28xx_fh      *fh  = priv;
 690         struct em28xx         *dev = fh->dev;
 691
 692         mutex_lock(&dev->lock);
 693
 694         f->fmt.pix.width = dev->width;
 695         f->fmt.pix.height = dev->height;
 696         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 697         f->fmt.pix.bytesperline = dev->width * 2;
 698         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
 699         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 700
 701         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
 702         f->fmt.pix.field = dev->interlaced ?
 703                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
 704
 705         mutex_unlock(&dev->lock);
 706         return 0;
 707 }
 708
 709 static int vidioc_try_fmt_cap(struct file *file, void *priv,
 710                         struct v4l2_format *f)
 711 {
 712         struct em28xx_fh      *fh    = priv;
 713         struct em28xx         *dev   = fh->dev;
 714         int                   width  = f->fmt.pix.width;
 715         int                   height = f->fmt.pix.height;
 716         unsigned int          maxw   = norm_maxw(dev);
 717         unsigned int          maxh   = norm_maxh(dev);
 718         unsigned int          hscale, vscale;
 719
 720         /* width must even because of the YUYV format
 721            height must be even because of interlacing */
 722         height &= 0xfffe;
 723         width &= 0xfffe;
 724
 725         if (height < 32)
 726                 height = 32;
 727         if (height > maxh)
 728                 height = maxh;
 729         if (width < 48)
 730                 width = 48;
 731         if (width > maxw)
 732                 width = maxw;
 733
 734         mutex_lock(&dev->lock);
 735
 736         if (dev->is_em2800) {
 737                 /* the em2800 can only scale down to 50% */
 738                 if (height % (maxh / 2))
 739                         height = maxh;
 740                 if (width % (maxw / 2))
 741                         width = maxw;
 742                 /* according to empiatech support */
 743                 /* the MaxPacketSize is to small to support */
 744                 /* framesizes larger than 640x480 @ 30 fps */
 745                 /* or 640x576 @ 25 fps. As this would cut */
 746                 /* of a part of the image we prefer */
 747                 /* 360x576 or 360x480 for now */
 748                 if (width == maxw && height == maxh)
 749                         width /= 2;
 750         }
 751
 752         get_scale(dev, width, height, &hscale, &vscale);
 753
 754         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
 755         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
 756
 757         f->fmt.pix.width = width;
 758         f->fmt.pix.height = height;
 759         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
 760         f->fmt.pix.bytesperline = width * 2;
 761         f->fmt.pix.sizeimage = width * 2 * height;
 762         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 763         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
 764
 765         mutex_unlock(&dev->lock);
 766         return 0;
 767 }
 768
 769 static int vidioc_s_fmt_cap(struct file *file, void *priv,
 770                         struct v4l2_format *f)
 771 {
 772         struct em28xx_fh      *fh  = priv;
 773         struct em28xx         *dev = fh->dev;
 774         int                   rc;
 775
 776         rc = check_dev(dev);
 777         if (rc < 0)
 778                 return rc;
 779
 780         vidioc_try_fmt_cap(file, priv, f);
 781
 782         mutex_lock(&dev->lock);
 783
 784         if (videobuf_queue_is_busy(&fh->vb_vidq)) {
 785                 em28xx_errdev("%s queue busy\n", __func__);
 786                 rc = -EBUSY;
 787                 goto out;
 788         }
 789
 790         if (dev->stream_on && !fh->stream_on) {
 791                 em28xx_errdev("%s device in use by another fh\n", __func__);
 792                 rc = -EBUSY;
 793                 goto out;
 794         }
 795
 796         /* set new image size */
 797         dev->width = f->fmt.pix.width;
 798         dev->height = f->fmt.pix.height;
 799         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 800
 801         em28xx_set_alternate(dev);
 802         em28xx_resolution_set(dev);
 803
 804         rc = 0;
 805
 806 out:
 807         mutex_unlock(&dev->lock);
 808         return rc;
 809 }
 810
 811 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id * norm)
 812 {
 813         struct em28xx_fh   *fh  = priv;
 814         struct em28xx      *dev = fh->dev;
 815         struct v4l2_format f;
 816         int                rc;
 817
 818         rc = check_dev(dev);
 819         if (rc < 0)
 820                 return rc;
 821
 822         mutex_lock(&dev->lock);
 823         dev->norm = *norm;
 824         mutex_unlock(&dev->lock);
 825
 826         /* Adjusts width/height, if needed */
 827         f.fmt.pix.width = dev->width;
 828         f.fmt.pix.height = dev->height;
 829         vidioc_try_fmt_cap(file, priv, &f);
 830
 831         mutex_lock(&dev->lock);
 832
 833         /* set new image size */
 834         dev->width = f.fmt.pix.width;
 835         dev->height = f.fmt.pix.height;
 836         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
 837
 838         em28xx_resolution_set(dev);
 839         em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);
 840
 841         mutex_unlock(&dev->lock);
 842         return 0;
 843 }
 844
 845 static const char *iname[] = {
 846         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
 847         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
 848         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
 849         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
 850         [EM28XX_VMUX_SVIDEO]     = "S-Video",
 851         [EM28XX_VMUX_TELEVISION] = "Television",
 852         [EM28XX_VMUX_CABLE]      = "Cable TV",
 853         [EM28XX_VMUX_DVB]        = "DVB",
 854         [EM28XX_VMUX_DEBUG]      = "for debug only",
 855 };
 856
 857 static int vidioc_enum_input(struct file *file, void *priv,
 858                                 struct v4l2_input *i)
 859 {
 860         struct em28xx_fh   *fh  = priv;
 861         struct em28xx      *dev = fh->dev;
 862         unsigned int       n;
 863
 864         n = i->index;
 865         if (n >= MAX_EM28XX_INPUT)
 866                 return -EINVAL;
 867         if (0 == INPUT(n)->type)
 868                 return -EINVAL;
 869
 870         i->index = n;
 871         i->type = V4L2_INPUT_TYPE_CAMERA;
 872
 873         strcpy(i->name, iname[INPUT(n)->type]);
 874
 875         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
 876                 (EM28XX_VMUX_CABLE == INPUT(n)->type))
 877                 i->type = V4L2_INPUT_TYPE_TUNER;
 878
 879         i->std = dev->vdev->tvnorms;
 880
 881         return 0;
 882 }
 883
 884 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 885 {
 886         struct em28xx_fh   *fh  = priv;
 887         struct em28xx      *dev = fh->dev;
 888
 889         *i = dev->ctl_input;
 890
 891         return 0;
 892 }
 893
 894 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 895 {
 896         struct em28xx_fh   *fh  = priv;
 897         struct em28xx      *dev = fh->dev;
 898         int                rc;
 899
 900         rc = check_dev(dev);
 901         if (rc < 0)
 902                 return rc;
 903
 904         if (i >= MAX_EM28XX_INPUT)
 905                 return -EINVAL;
 906         if (0 == INPUT(i)->type)
 907                 return -EINVAL;
 908
 909         mutex_lock(&dev->lock);
 910
 911         video_mux(dev, i);
 912
 913         mutex_unlock(&dev->lock);
 914         return 0;
 915 }
 916
 917 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 918 {
 919         struct em28xx_fh   *fh    = priv;
 920         struct em28xx      *dev   = fh->dev;
 921         unsigned int        index = a->index;
 922
 923         if (a->index > 1)
 924                 return -EINVAL;
 925
 926         index = dev->ctl_ainput;
 927
 928         if (index == 0)
 929                 strcpy(a->name, "Television");
 930         else
 931                 strcpy(a->name, "Line In");
 932
 933         a->capability = V4L2_AUDCAP_STEREO;
 934         a->index = index;
 935
 936         return 0;
 937 }
 938
 939 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 940 {
 941         struct em28xx_fh   *fh  = priv;
 942         struct em28xx      *dev = fh->dev;
 943
 944         if (a->index != dev->ctl_ainput)
 945                 return -EINVAL;
 946
 947         return 0;
 948 }
 949
 950 static int vidioc_queryctrl(struct file *file, void *priv,
 951                                 struct v4l2_queryctrl *qc)
 952 {
 953         struct em28xx_fh      *fh  = priv;
 954         struct em28xx         *dev = fh->dev;
 955         int                   id  = qc->id;
 956         int                   i;
 957         int                   rc;
 958
 959         rc = check_dev(dev);
 960         if (rc < 0)
 961                 return rc;
 962
 963         memset(qc, 0, sizeof(*qc));
 964
 965         qc->id = id;
 966
 967         if (!dev->has_msp34xx) {
 968                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
 969                         if (qc->id && qc->id == em28xx_qctrl[i].id) {
 970                                 memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
 971                                 return 0;
 972                         }
 973                 }
 974         }
 975         mutex_lock(&dev->lock);
 976         em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
 977         mutex_unlock(&dev->lock);
 978
 979         if (qc->type)
 980                 return 0;
 981         else
 982                 return -EINVAL;
 983 }
 984
 985 static int vidioc_g_ctrl(struct file *file, void *priv,
 986                                 struct v4l2_control *ctrl)
 987 {
 988         struct em28xx_fh      *fh  = priv;
 989         struct em28xx         *dev = fh->dev;
 990         int                   rc;
 991
 992         rc = check_dev(dev);
 993         if (rc < 0)
 994                 return rc;
 995         mutex_lock(&dev->lock);
 996
 997         if (!dev->has_msp34xx)
 998                 rc = em28xx_get_ctrl(dev, ctrl);
 999         else
1000                 rc = -EINVAL;
1001
1002         if (rc == -EINVAL) {
1003                 em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
1004                 rc = 0;
1005         }
1006
1007         mutex_unlock(&dev->lock);
1008         return rc;
1009 }
1010
1011 static int vidioc_s_ctrl(struct file *file, void *priv,
1012                                 struct v4l2_control *ctrl)
1013 {
1014         struct em28xx_fh      *fh  = priv;
1015         struct em28xx         *dev = fh->dev;
1016         u8                    i;
1017         int                   rc;
1018
1019         rc = check_dev(dev);
1020         if (rc < 0)
1021                 return rc;
1022
1023         mutex_lock(&dev->lock);
1024
1025         if (dev->has_msp34xx)
1026                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
1027         else {
1028                 rc = 1;
1029                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1030                         if (ctrl->id == em28xx_qctrl[i].id) {
1031                                 if (ctrl->value < em28xx_qctrl[i].minimum ||
1032                                     ctrl->value > em28xx_qctrl[i].maximum) {
1033                                         rc = -ERANGE;
1034                                         break;
1035                                 }
1036
1037                                 rc = em28xx_set_ctrl(dev, ctrl);
1038                                 break;
1039                         }
1040                 }
1041         }
1042
1043         /* Control not found - try to send it to the attached devices */
1044         if (rc == 1) {
1045                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
1046                 rc = 0;
1047         }
1048
1049         mutex_unlock(&dev->lock);
1050         return rc;
1051 }
1052
1053 static int vidioc_g_tuner(struct file *file, void *priv,
1054                                 struct v4l2_tuner *t)
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 (0 != t->index)
1065                 return -EINVAL;
1066
1067         strcpy(t->name, "Tuner");
1068
1069         mutex_lock(&dev->lock);
1070
1071         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1072
1073         mutex_unlock(&dev->lock);
1074         return 0;
1075 }
1076
1077 static int vidioc_s_tuner(struct file *file, void *priv,
1078                                 struct v4l2_tuner *t)
1079 {
1080         struct em28xx_fh      *fh  = priv;
1081         struct em28xx         *dev = fh->dev;
1082         int                   rc;
1083
1084         rc = check_dev(dev);
1085         if (rc < 0)
1086                 return rc;
1087
1088         if (0 != t->index)
1089                 return -EINVAL;
1090
1091         mutex_lock(&dev->lock);
1092
1093         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1094
1095         mutex_unlock(&dev->lock);
1096         return 0;
1097 }
1098
1099 static int vidioc_g_frequency(struct file *file, void *priv,
1100                                 struct v4l2_frequency *f)
1101 {
1102         struct em28xx_fh      *fh  = priv;
1103         struct em28xx         *dev = fh->dev;
1104
1105         f->type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1106         f->frequency = dev->ctl_freq;
1107
1108         return 0;
1109 }
1110
1111 static int vidioc_s_frequency(struct file *file, void *priv,
1112                                 struct v4l2_frequency *f)
1113 {
1114         struct em28xx_fh      *fh  = priv;
1115         struct em28xx         *dev = fh->dev;
1116         int                   rc;
1117
1118         rc = check_dev(dev);
1119         if (rc < 0)
1120                 return rc;
1121
1122         if (0 != f->tuner)
1123                 return -EINVAL;
1124
1125         if (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
1126                 return -EINVAL;
1127         if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
1128                 return -EINVAL;
1129
1130         mutex_lock(&dev->lock);
1131
1132         dev->ctl_freq = f->frequency;
1133         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1134
1135         mutex_unlock(&dev->lock);
1136         return 0;
1137 }
1138
1139 #ifdef CONFIG_VIDEO_ADV_DEBUG
1140 static int em28xx_reg_len(int reg)
1141 {
1142         switch (reg) {
1143         case EM28XX_R40_AC97LSB:
1144         case EM28XX_R30_HSCALELOW:
1145         case EM28XX_R32_VSCALELOW:
1146                 return 2;
1147         default:
1148                 return 1;
1149         }
1150 }
1151
1152 static int vidioc_g_register(struct file *file, void *priv,
1153                              struct v4l2_register *reg)
1154 {
1155         struct em28xx_fh      *fh  = priv;
1156         struct em28xx         *dev = fh->dev;
1157         int ret;
1158
1159         if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
1160                 return -EINVAL;
1161
1162         if (em28xx_reg_len(reg->reg) == 1) {
1163                 ret = em28xx_read_reg(dev, reg->reg);
1164                 if (ret < 0)
1165                         return ret;
1166
1167                 reg->val = ret;
1168         } else {
1169                 __le64 val = 0;
1170                 ret = em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
1171                                                    reg->reg, (char *)&val, 2);
1172                 if (ret < 0)
1173                         return ret;
1174
1175                 reg->val = le64_to_cpu(val);
1176         }
1177
1178         return 0;
1179 }
1180
1181 static int vidioc_s_register(struct file *file, void *priv,
1182                              struct v4l2_register *reg)
1183 {
1184         struct em28xx_fh      *fh  = priv;
1185         struct em28xx         *dev = fh->dev;
1186         __le64 buf;
1187
1188         buf = cpu_to_le64(reg->val);
1189
1190         return em28xx_write_regs(dev, reg->reg, (char *)&buf,
1191                                  em28xx_reg_len(reg->reg));
1192 }
1193 #endif
1194
1195
1196 static int vidioc_cropcap(struct file *file, void *priv,
1197                                         struct v4l2_cropcap *cc)
1198 {
1199         struct em28xx_fh      *fh  = priv;
1200         struct em28xx         *dev = fh->dev;
1201
1202         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1203                 return -EINVAL;
1204
1205         cc->bounds.left = 0;
1206         cc->bounds.top = 0;
1207         cc->bounds.width = dev->width;
1208         cc->bounds.height = dev->height;
1209         cc->defrect = cc->bounds;
1210         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1211         cc->pixelaspect.denominator = 59;
1212
1213         return 0;
1214 }
1215
1216 static int vidioc_streamon(struct file *file, void *priv,
1217                                         enum v4l2_buf_type type)
1218 {
1219         struct em28xx_fh      *fh  = priv;
1220         struct em28xx         *dev = fh->dev;
1221         int                   rc;
1222
1223         rc = check_dev(dev);
1224         if (rc < 0)
1225                 return rc;
1226
1227
1228         if (unlikely(res_get(fh) < 0))
1229                 return -EBUSY;
1230
1231         return (videobuf_streamon(&fh->vb_vidq));
1232 }
1233
1234 static int vidioc_streamoff(struct file *file, void *priv,
1235                                         enum v4l2_buf_type type)
1236 {
1237         struct em28xx_fh      *fh  = priv;
1238         struct em28xx         *dev = fh->dev;
1239         int                   rc;
1240
1241         rc = check_dev(dev);
1242         if (rc < 0)
1243                 return rc;
1244
1245         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1246                 return -EINVAL;
1247         if (type != fh->type)
1248                 return -EINVAL;
1249
1250         videobuf_streamoff(&fh->vb_vidq);
1251         res_free(fh);
1252
1253         return 0;
1254 }
1255
1256 static int vidioc_querycap(struct file *file, void  *priv,
1257                                         struct v4l2_capability *cap)
1258 {
1259         struct em28xx_fh      *fh  = priv;
1260         struct em28xx         *dev = fh->dev;
1261
1262         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1263         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1264         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1265
1266         cap->version = EM28XX_VERSION_CODE;
1267
1268         cap->capabilities =
1269                         V4L2_CAP_SLICED_VBI_CAPTURE |
1270                         V4L2_CAP_VIDEO_CAPTURE |
1271                         V4L2_CAP_AUDIO |
1272                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1273
1274         if (dev->tuner_type != TUNER_ABSENT)
1275                 cap->capabilities |= V4L2_CAP_TUNER;
1276
1277         return 0;
1278 }
1279
1280 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
1281                                         struct v4l2_fmtdesc *fmtd)
1282 {
1283         if (fmtd->index != 0)
1284                 return -EINVAL;
1285
1286         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1287         strcpy(fmtd->description, "Packed YUY2");
1288         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1289         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1290
1291         return 0;
1292 }
1293
1294 /* Sliced VBI ioctls */
1295 static int vidioc_g_fmt_vbi_capture(struct file *file, void *priv,
1296                                         struct v4l2_format *f)
1297 {
1298         struct em28xx_fh      *fh  = priv;
1299         struct em28xx         *dev = fh->dev;
1300         int                   rc;
1301
1302         rc = check_dev(dev);
1303         if (rc < 0)
1304                 return rc;
1305
1306         mutex_lock(&dev->lock);
1307
1308         f->fmt.sliced.service_set = 0;
1309
1310         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
1311
1312         if (f->fmt.sliced.service_set == 0)
1313                 rc = -EINVAL;
1314
1315         mutex_unlock(&dev->lock);
1316         return rc;
1317 }
1318
1319 static int vidioc_try_set_vbi_capture(struct file *file, void *priv,
1320                         struct v4l2_format *f)
1321 {
1322         struct em28xx_fh      *fh  = priv;
1323         struct em28xx         *dev = fh->dev;
1324         int                   rc;
1325
1326         rc = check_dev(dev);
1327         if (rc < 0)
1328                 return rc;
1329
1330         mutex_lock(&dev->lock);
1331         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
1332         mutex_unlock(&dev->lock);
1333
1334         if (f->fmt.sliced.service_set == 0)
1335                 return -EINVAL;
1336
1337         return 0;
1338 }
1339
1340
1341 static int vidioc_reqbufs(struct file *file, void *priv,
1342                           struct v4l2_requestbuffers *rb)
1343 {
1344         struct em28xx_fh      *fh  = priv;
1345         struct em28xx         *dev = fh->dev;
1346         int                   rc;
1347
1348         rc = check_dev(dev);
1349         if (rc < 0)
1350                 return rc;
1351
1352         return (videobuf_reqbufs(&fh->vb_vidq, rb));
1353 }
1354
1355 static int vidioc_querybuf(struct file *file, void *priv,
1356                            struct v4l2_buffer *b)
1357 {
1358         struct em28xx_fh      *fh  = priv;
1359         struct em28xx         *dev = fh->dev;
1360         int                   rc;
1361
1362         rc = check_dev(dev);
1363         if (rc < 0)
1364                 return rc;
1365
1366         return (videobuf_querybuf(&fh->vb_vidq, b));
1367 }
1368
1369 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1370 {
1371         struct em28xx_fh      *fh  = priv;
1372         struct em28xx         *dev = fh->dev;
1373         int                   rc;
1374
1375         rc = check_dev(dev);
1376         if (rc < 0)
1377                 return rc;
1378
1379         return (videobuf_qbuf(&fh->vb_vidq, b));
1380 }
1381
1382 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1383 {
1384         struct em28xx_fh      *fh  = priv;
1385         struct em28xx         *dev = fh->dev;
1386         int                   rc;
1387
1388         rc = check_dev(dev);
1389         if (rc < 0)
1390                 return rc;
1391
1392         return (videobuf_dqbuf(&fh->vb_vidq, b,
1393                                 file->f_flags & O_NONBLOCK));
1394 }
1395
1396 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1397 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
1398 {
1399         struct em28xx_fh  *fh = priv;
1400
1401         return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
1402 }
1403 #endif
1404
1405
1406 /* ----------------------------------------------------------- */
1407 /* RADIO ESPECIFIC IOCTLS                                      */
1408 /* ----------------------------------------------------------- */
1409
1410 static int radio_querycap(struct file *file, void  *priv,
1411                           struct v4l2_capability *cap)
1412 {
1413         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1414
1415         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1416         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1417         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1418
1419         cap->version = EM28XX_VERSION_CODE;
1420         cap->capabilities = V4L2_CAP_TUNER;
1421         return 0;
1422 }
1423
1424 static int radio_g_tuner(struct file *file, void *priv,
1425                          struct v4l2_tuner *t)
1426 {
1427         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1428
1429         if (unlikely(t->index > 0))
1430                 return -EINVAL;
1431
1432         strcpy(t->name, "Radio");
1433         t->type = V4L2_TUNER_RADIO;
1434
1435         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1436         return 0;
1437 }
1438
1439 static int radio_enum_input(struct file *file, void *priv,
1440                             struct v4l2_input *i)
1441 {
1442         if (i->index != 0)
1443                 return -EINVAL;
1444         strcpy(i->name, "Radio");
1445         i->type = V4L2_INPUT_TYPE_TUNER;
1446
1447         return 0;
1448 }
1449
1450 static int radio_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1451 {
1452         if (unlikely(a->index))
1453                 return -EINVAL;
1454
1455         strcpy(a->name, "Radio");
1456         return 0;
1457 }
1458
1459 static int radio_s_tuner(struct file *file, void *priv,
1460                          struct v4l2_tuner *t)
1461 {
1462         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1463
1464         if (0 != t->index)
1465                 return -EINVAL;
1466
1467         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1468
1469         return 0;
1470 }
1471
1472 static int radio_s_audio(struct file *file, void *fh,
1473                          struct v4l2_audio *a)
1474 {
1475         return 0;
1476 }
1477
1478 static int radio_s_input(struct file *file, void *fh, unsigned int i)
1479 {
1480         return 0;
1481 }
1482
1483 static int radio_queryctrl(struct file *file, void *priv,
1484                            struct v4l2_queryctrl *qc)
1485 {
1486         int i;
1487
1488         if (qc->id <  V4L2_CID_BASE ||
1489                 qc->id >= V4L2_CID_LASTP1)
1490                 return -EINVAL;
1491
1492         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1493                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1494                         memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
1495                         return 0;
1496                 }
1497         }
1498
1499         return -EINVAL;
1500 }
1501
1502 /*
1503  * em28xx_v4l2_open()
1504  * inits the device and starts isoc transfer
1505  */
1506 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1507 {
1508         int minor = iminor(inode);
1509         int errCode = 0, radio = 0;
1510         struct em28xx *h, *dev = NULL;
1511         struct em28xx_fh *fh;
1512         enum v4l2_buf_type fh_type = 0;
1513
1514         list_for_each_entry(h, &em28xx_devlist, devlist) {
1515                 if (h->vdev->minor == minor) {
1516                         dev  = h;
1517                         fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1518                 }
1519                 if (h->vbi_dev->minor == minor) {
1520                         dev  = h;
1521                         fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
1522                 }
1523                 if (h->radio_dev &&
1524                     h->radio_dev->minor == minor) {
1525                         radio = 1;
1526                         dev   = h;
1527                 }
1528         }
1529         if (NULL == dev)
1530                 return -ENODEV;
1531
1532         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1533                                 minor, v4l2_type_names[fh_type], dev->users);
1534
1535
1536         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1537         if (!fh) {
1538                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1539                 return -ENOMEM;
1540         }
1541         mutex_lock(&dev->lock);
1542         fh->dev = dev;
1543         fh->radio = radio;
1544         fh->type = fh_type;
1545         filp->private_data = fh;
1546
1547         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1548                 dev->width = norm_maxw(dev);
1549                 dev->height = norm_maxh(dev);
1550                 dev->hscale = 0;
1551                 dev->vscale = 0;
1552
1553                 em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
1554                 em28xx_set_alternate(dev);
1555                 em28xx_resolution_set(dev);
1556
1557                 /* Needed, since GPIO might have disabled power of
1558                    some i2c device
1559                  */
1560                 em28xx_config_i2c(dev);
1561
1562         }
1563         if (fh->radio) {
1564                 em28xx_videodbg("video_open: setting radio device\n");
1565                 em28xx_i2c_call_clients(dev, AUDC_SET_RADIO, NULL);
1566         }
1567
1568         dev->users++;
1569
1570         videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
1571                         NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
1572                         sizeof(struct em28xx_buffer), fh);
1573
1574         mutex_unlock(&dev->lock);
1575
1576         return errCode;
1577 }
1578
1579 /*
1580  * em28xx_realease_resources()
1581  * unregisters the v4l2,i2c and usb devices
1582  * called when the device gets disconected or at module unload
1583 */
1584 static void em28xx_release_resources(struct em28xx *dev)
1585 {
1586
1587         /*FIXME: I2C IR should be disconnected */
1588
1589         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1590                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1591                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1592         list_del(&dev->devlist);
1593         if (dev->radio_dev) {
1594                 if (-1 != dev->radio_dev->minor)
1595                         video_unregister_device(dev->radio_dev);
1596                 else
1597                         video_device_release(dev->radio_dev);
1598                 dev->radio_dev = NULL;
1599         }
1600         if (dev->vbi_dev) {
1601                 if (-1 != dev->vbi_dev->minor)
1602                         video_unregister_device(dev->vbi_dev);
1603                 else
1604                         video_device_release(dev->vbi_dev);
1605                 dev->vbi_dev = NULL;
1606         }
1607         if (dev->vdev) {
1608                 if (-1 != dev->vdev->minor)
1609                         video_unregister_device(dev->vdev);
1610                 else
1611                         video_device_release(dev->vdev);
1612                 dev->vdev = NULL;
1613         }
1614         em28xx_i2c_unregister(dev);
1615         usb_put_dev(dev->udev);
1616
1617         /* Mark device as unused */
1618         em28xx_devused &= ~(1<<dev->devno);
1619 }
1620
1621 /*
1622  * em28xx_v4l2_close()
1623  * stops streaming and deallocates all resources allocated by the v4l2
1624  * calls and ioctls
1625  */
1626 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1627 {
1628         struct em28xx_fh *fh  = filp->private_data;
1629         struct em28xx    *dev = fh->dev;
1630         int              errCode;
1631
1632         em28xx_videodbg("users=%d\n", dev->users);
1633
1634
1635         if (res_check(fh))
1636                 res_free(fh);
1637
1638         mutex_lock(&dev->lock);
1639
1640         if (dev->users == 1) {
1641                 videobuf_stop(&fh->vb_vidq);
1642                 videobuf_mmap_free(&fh->vb_vidq);
1643
1644                 /* the device is already disconnect,
1645                    free the remaining resources */
1646                 if (dev->state & DEV_DISCONNECTED) {
1647                         em28xx_release_resources(dev);
1648                         mutex_unlock(&dev->lock);
1649                         kfree(dev);
1650                         return 0;
1651                 }
1652
1653                 /* do this before setting alternate! */
1654                 em28xx_uninit_isoc(dev);
1655                 em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
1656
1657                 /* set alternate 0 */
1658                 dev->alt = 0;
1659                 em28xx_videodbg("setting alternate 0\n");
1660                 errCode = usb_set_interface(dev->udev, 0, 0);
1661                 if (errCode < 0) {
1662                         em28xx_errdev("cannot change alternate number to "
1663                                         "0 (error=%i)\n", errCode);
1664                 }
1665         }
1666         kfree(fh);
1667         dev->users--;
1668         wake_up_interruptible_nr(&dev->open, 1);
1669         mutex_unlock(&dev->lock);
1670         return 0;
1671 }
1672
1673 /*
1674  * em28xx_v4l2_read()
1675  * will allocate buffers when called for the first time
1676  */
1677 static ssize_t
1678 em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
1679                  loff_t *pos)
1680 {
1681         struct em28xx_fh *fh = filp->private_data;
1682         struct em28xx *dev = fh->dev;
1683         int rc;
1684
1685         rc = check_dev(dev);
1686         if (rc < 0)
1687                 return rc;
1688
1689         /* FIXME: read() is not prepared to allow changing the video
1690            resolution while streaming. Seems a bug at em28xx_set_fmt
1691          */
1692
1693         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1694                 if (unlikely(res_get(fh)))
1695                         return -EBUSY;
1696
1697                 return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0,
1698                                         filp->f_flags & O_NONBLOCK);
1699         }
1700         return 0;
1701 }
1702
1703 /*
1704  * em28xx_v4l2_poll()
1705  * will allocate buffers when called for the first time
1706  */
1707 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1708 {
1709         struct em28xx_fh *fh = filp->private_data;
1710         struct em28xx *dev = fh->dev;
1711         int rc;
1712
1713         rc = check_dev(dev);
1714         if (rc < 0)
1715                 return rc;
1716
1717         if (unlikely(res_get(fh) < 0))
1718                 return POLLERR;
1719
1720         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1721                 return POLLERR;
1722
1723         return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
1724 }
1725
1726 /*
1727  * em28xx_v4l2_mmap()
1728  */
1729 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1730 {
1731         struct em28xx_fh *fh    = filp->private_data;
1732         struct em28xx    *dev   = fh->dev;
1733         int              rc;
1734
1735         if (unlikely(res_get(fh) < 0))
1736                 return -EBUSY;
1737
1738         rc = check_dev(dev);
1739         if (rc < 0)
1740                 return rc;
1741
1742         rc = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1743
1744         em28xx_videodbg("vma start=0x%08lx, size=%ld, ret=%d\n",
1745                 (unsigned long)vma->vm_start,
1746                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1747                 rc);
1748
1749         return rc;
1750 }
1751
1752 static const struct file_operations em28xx_v4l_fops = {
1753         .owner         = THIS_MODULE,
1754         .open          = em28xx_v4l2_open,
1755         .release       = em28xx_v4l2_close,
1756         .read          = em28xx_v4l2_read,
1757         .poll          = em28xx_v4l2_poll,
1758         .mmap          = em28xx_v4l2_mmap,
1759         .ioctl         = video_ioctl2,
1760         .llseek        = no_llseek,
1761         .compat_ioctl  = v4l_compat_ioctl32,
1762 };
1763
1764 static const struct file_operations radio_fops = {
1765         .owner         = THIS_MODULE,
1766         .open          = em28xx_v4l2_open,
1767         .release       = em28xx_v4l2_close,
1768         .ioctl         = video_ioctl2,
1769         .compat_ioctl  = v4l_compat_ioctl32,
1770         .llseek        = no_llseek,
1771 };
1772
1773 static const struct video_device em28xx_video_template = {
1774         .fops                       = &em28xx_v4l_fops,
1775         .release                    = video_device_release,
1776
1777         .minor                      = -1,
1778         .vidioc_querycap            = vidioc_querycap,
1779         .vidioc_enum_fmt_cap        = vidioc_enum_fmt_cap,
1780         .vidioc_g_fmt_cap           = vidioc_g_fmt_cap,
1781         .vidioc_try_fmt_cap         = vidioc_try_fmt_cap,
1782         .vidioc_s_fmt_cap           = vidioc_s_fmt_cap,
1783         .vidioc_g_audio             = vidioc_g_audio,
1784         .vidioc_s_audio             = vidioc_s_audio,
1785         .vidioc_cropcap             = vidioc_cropcap,
1786
1787         .vidioc_g_fmt_vbi_capture   = vidioc_g_fmt_vbi_capture,
1788         .vidioc_try_fmt_vbi_capture = vidioc_try_set_vbi_capture,
1789         .vidioc_s_fmt_vbi_capture   = vidioc_try_set_vbi_capture,
1790
1791         .vidioc_reqbufs             = vidioc_reqbufs,
1792         .vidioc_querybuf            = vidioc_querybuf,
1793         .vidioc_qbuf                = vidioc_qbuf,
1794         .vidioc_dqbuf               = vidioc_dqbuf,
1795         .vidioc_s_std               = vidioc_s_std,
1796         .vidioc_enum_input          = vidioc_enum_input,
1797         .vidioc_g_input             = vidioc_g_input,
1798         .vidioc_s_input             = vidioc_s_input,
1799         .vidioc_queryctrl           = vidioc_queryctrl,
1800         .vidioc_g_ctrl              = vidioc_g_ctrl,
1801         .vidioc_s_ctrl              = vidioc_s_ctrl,
1802         .vidioc_streamon            = vidioc_streamon,
1803         .vidioc_streamoff           = vidioc_streamoff,
1804         .vidioc_g_tuner             = vidioc_g_tuner,
1805         .vidioc_s_tuner             = vidioc_s_tuner,
1806         .vidioc_g_frequency         = vidioc_g_frequency,
1807         .vidioc_s_frequency         = vidioc_s_frequency,
1808 #ifdef CONFIG_VIDEO_ADV_DEBUG
1809         .vidioc_g_register          = vidioc_g_register,
1810         .vidioc_s_register          = vidioc_s_register,
1811 #endif
1812 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1813         .vidiocgmbuf                = vidiocgmbuf,
1814 #endif
1815
1816         .tvnorms                    = V4L2_STD_ALL,
1817         .current_norm               = V4L2_STD_PAL,
1818 };
1819
1820 static struct video_device em28xx_radio_template = {
1821         .name                 = "em28xx-radio",
1822         .type                 = VID_TYPE_TUNER,
1823         .fops                 = &radio_fops,
1824         .minor                = -1,
1825         .vidioc_querycap      = radio_querycap,
1826         .vidioc_g_tuner       = radio_g_tuner,
1827         .vidioc_enum_input    = radio_enum_input,
1828         .vidioc_g_audio       = radio_g_audio,
1829         .vidioc_s_tuner       = radio_s_tuner,
1830         .vidioc_s_audio       = radio_s_audio,
1831         .vidioc_s_input       = radio_s_input,
1832         .vidioc_queryctrl     = radio_queryctrl,
1833         .vidioc_g_ctrl        = vidioc_g_ctrl,
1834         .vidioc_s_ctrl        = vidioc_s_ctrl,
1835         .vidioc_g_frequency   = vidioc_g_frequency,
1836         .vidioc_s_frequency   = vidioc_s_frequency,
1837 #ifdef CONFIG_VIDEO_ADV_DEBUG
1838         .vidioc_g_register    = vidioc_g_register,
1839         .vidioc_s_register    = vidioc_s_register,
1840 #endif
1841 };
1842
1843 /******************************** usb interface ******************************/
1844
1845
1846 static LIST_HEAD(em28xx_extension_devlist);
1847 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1848
1849 int em28xx_register_extension(struct em28xx_ops *ops)
1850 {
1851         struct em28xx *dev = NULL;
1852
1853         mutex_lock(&em28xx_extension_devlist_lock);
1854         list_add_tail(&ops->next, &em28xx_extension_devlist);
1855         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1856                 if (dev)
1857                         ops->init(dev);
1858         }
1859         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1860         mutex_unlock(&em28xx_extension_devlist_lock);
1861         return 0;
1862 }
1863 EXPORT_SYMBOL(em28xx_register_extension);
1864
1865 void em28xx_unregister_extension(struct em28xx_ops *ops)
1866 {
1867         struct em28xx *dev = NULL;
1868
1869         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1870                 if (dev)
1871                         ops->fini(dev);
1872         }
1873
1874         mutex_lock(&em28xx_extension_devlist_lock);
1875         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1876         list_del(&ops->next);
1877         mutex_unlock(&em28xx_extension_devlist_lock);
1878 }
1879 EXPORT_SYMBOL(em28xx_unregister_extension);
1880
1881 static struct video_device *em28xx_vdev_init(struct em28xx *dev,
1882                                              const struct video_device *template,
1883                                              const int type,
1884                                              const char *type_name)
1885 {
1886         struct video_device *vfd;
1887
1888         vfd = video_device_alloc();
1889         if (NULL == vfd)
1890                 return NULL;
1891         *vfd = *template;
1892         vfd->minor   = -1;
1893         vfd->dev = &dev->udev->dev;
1894         vfd->release = video_device_release;
1895         vfd->type = type;
1896         vfd->debug = video_debug;
1897
1898         snprintf(vfd->name, sizeof(vfd->name), "%s %s",
1899                  dev->name, type_name);
1900
1901         return vfd;
1902 }
1903
1904
1905 /*
1906  * em28xx_init_dev()
1907  * allocates and inits the device structs, registers i2c bus and v4l device
1908  */
1909 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1910                            int minor)
1911 {
1912         struct em28xx_ops *ops = NULL;
1913         struct em28xx *dev = *devhandle;
1914         int retval = -ENOMEM;
1915         int errCode;
1916         unsigned int maxh, maxw;
1917
1918         dev->udev = udev;
1919         mutex_init(&dev->lock);
1920         spin_lock_init(&dev->slock);
1921         init_waitqueue_head(&dev->open);
1922         init_waitqueue_head(&dev->wait_frame);
1923         init_waitqueue_head(&dev->wait_stream);
1924
1925         dev->em28xx_write_regs = em28xx_write_regs;
1926         dev->em28xx_read_reg = em28xx_read_reg;
1927         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1928         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1929         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1930         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1931
1932         em28xx_pre_card_setup(dev);
1933
1934         errCode = em28xx_config(dev);
1935         if (errCode) {
1936                 em28xx_errdev("error configuring device\n");
1937                 em28xx_devused &= ~(1<<dev->devno);
1938                 kfree(dev);
1939                 return -ENOMEM;
1940         }
1941
1942         /* register i2c bus */
1943         em28xx_i2c_register(dev);
1944
1945         /* Do board specific init and eeprom reading */
1946         em28xx_card_setup(dev);
1947
1948         /* Configure audio */
1949         em28xx_audio_analog_set(dev);
1950
1951         /* configure the device */
1952         em28xx_config_i2c(dev);
1953
1954         /* set default norm */
1955         dev->norm = em28xx_video_template.current_norm;
1956
1957         maxw = norm_maxw(dev);
1958         maxh = norm_maxh(dev);
1959
1960         /* set default image size */
1961         dev->width = maxw;
1962         dev->height = maxh;
1963         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1964         dev->hscale = 0;
1965         dev->vscale = 0;
1966         dev->ctl_input = 2;
1967
1968         errCode = em28xx_config(dev);
1969
1970         list_add_tail(&dev->devlist, &em28xx_devlist);
1971
1972         /* allocate and fill video video_device struct */
1973         dev->vdev = em28xx_vdev_init(dev, &em28xx_video_template,
1974                                           VID_TYPE_CAPTURE, "video");
1975         if (NULL == dev->vdev) {
1976                 em28xx_errdev("cannot allocate video_device.\n");
1977                 goto fail_unreg;
1978         }
1979         if (dev->tuner_type != TUNER_ABSENT)
1980                 dev->vdev->type |= VID_TYPE_TUNER;
1981
1982         /* register v4l2 video video_device */
1983         retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1984                                        video_nr[dev->devno]);
1985         if (retval) {
1986                 em28xx_errdev("unable to register video device (error=%i).\n",
1987                               retval);
1988                 goto fail_unreg;
1989         }
1990
1991         /* Allocate and fill vbi video_device struct */
1992         dev->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
1993                                           VFL_TYPE_VBI, "vbi");
1994         /* register v4l2 vbi video_device */
1995         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1996                                         vbi_nr[dev->devno]) < 0) {
1997                 em28xx_errdev("unable to register vbi device\n");
1998                 retval = -ENODEV;
1999                 goto fail_unreg;
2000         }
2001
2002         if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
2003                 dev->radio_dev = em28xx_vdev_init(dev, &em28xx_radio_template,
2004                                         VFL_TYPE_RADIO, "radio");
2005                 if (NULL == dev->radio_dev) {
2006                         em28xx_errdev("cannot allocate video_device.\n");
2007                         goto fail_unreg;
2008                 }
2009                 retval = video_register_device(dev->radio_dev, VFL_TYPE_RADIO,
2010                                             radio_nr[dev->devno]);
2011                 if (retval < 0) {
2012                         em28xx_errdev("can't register radio device\n");
2013                         goto fail_unreg;
2014                 }
2015                 em28xx_info("Registered radio device as /dev/radio%d\n",
2016                             dev->radio_dev->minor & 0x1f);
2017         }
2018
2019         /* init video dma queues */
2020         INIT_LIST_HEAD(&dev->vidq.active);
2021         INIT_LIST_HEAD(&dev->vidq.queued);
2022
2023
2024         if (dev->has_msp34xx) {
2025                 /* Send a reset to other chips via gpio */
2026                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
2027                 msleep(3);
2028                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
2029                 msleep(3);
2030         }
2031
2032         video_mux(dev, 0);
2033
2034         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
2035                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
2036                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
2037
2038         mutex_lock(&em28xx_extension_devlist_lock);
2039         if (!list_empty(&em28xx_extension_devlist)) {
2040                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2041                         if (ops->id)
2042                                 ops->init(dev);
2043                 }
2044         }
2045         mutex_unlock(&em28xx_extension_devlist_lock);
2046
2047         return 0;
2048
2049 fail_unreg:
2050         em28xx_release_resources(dev);
2051         mutex_unlock(&dev->lock);
2052         kfree(dev);
2053         return retval;
2054 }
2055
2056 #if defined(CONFIG_MODULES) && defined(MODULE)
2057 static void request_module_async(struct work_struct *work)
2058 {
2059         struct em28xx *dev = container_of(work,
2060                              struct em28xx, request_module_wk);
2061
2062         if (dev->has_audio_class)
2063                 request_module("snd-usb-audio");
2064         else
2065                 request_module("em28xx-alsa");
2066
2067         if (dev->has_dvb)
2068                 request_module("em28xx-dvb");
2069 }
2070
2071 static void request_modules(struct em28xx *dev)
2072 {
2073         INIT_WORK(&dev->request_module_wk, request_module_async);
2074         schedule_work(&dev->request_module_wk);
2075 }
2076 #else
2077 #define request_modules(dev)
2078 #endif /* CONFIG_MODULES */
2079
2080 /*
2081  * em28xx_usb_probe()
2082  * checks for supported devices
2083  */
2084 static int em28xx_usb_probe(struct usb_interface *interface,
2085                             const struct usb_device_id *id)
2086 {
2087         const struct usb_endpoint_descriptor *endpoint;
2088         struct usb_device *udev;
2089         struct usb_interface *uif;
2090         struct em28xx *dev = NULL;
2091         int retval = -ENODEV;
2092         int i, nr, ifnum;
2093
2094         udev = usb_get_dev(interface_to_usbdev(interface));
2095         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
2096
2097         /* Check to see next free device and mark as used */
2098         nr = find_first_zero_bit(&em28xx_devused, EM28XX_MAXBOARDS);
2099         em28xx_devused |= 1<<nr;
2100
2101         /* Don't register audio interfaces */
2102         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2103                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
2104                                 udev->descriptor.idVendor,
2105                                 udev->descriptor.idProduct,
2106                                 ifnum,
2107                                 interface->altsetting[0].desc.bInterfaceClass);
2108
2109                 em28xx_devused &= ~(1<<nr);
2110                 return -ENODEV;
2111         }
2112
2113         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
2114                         udev->descriptor.idVendor,
2115                         udev->descriptor.idProduct,
2116                         ifnum,
2117                         interface->altsetting[0].desc.bInterfaceClass);
2118
2119         endpoint = &interface->cur_altsetting->endpoint[1].desc;
2120
2121         /* check if the device has the iso in endpoint at the correct place */
2122         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2123             USB_ENDPOINT_XFER_ISOC) {
2124                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
2125                 em28xx_devused &= ~(1<<nr);
2126                 return -ENODEV;
2127         }
2128         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
2129                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
2130                 em28xx_devused &= ~(1<<nr);
2131                 return -ENODEV;
2132         }
2133
2134         if (nr >= EM28XX_MAXBOARDS) {
2135                 printk(DRIVER_NAME ": Supports only %i em28xx boards.\n",
2136                                 EM28XX_MAXBOARDS);
2137                 em28xx_devused &= ~(1<<nr);
2138                 return -ENOMEM;
2139         }
2140
2141         /* allocate memory for our device state and initialize it */
2142         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2143         if (dev == NULL) {
2144                 em28xx_err(DRIVER_NAME ": out of memory!\n");
2145                 em28xx_devused &= ~(1<<nr);
2146                 return -ENOMEM;
2147         }
2148
2149         snprintf(dev->name, 29, "em28xx #%d", nr);
2150         dev->devno = nr;
2151         dev->model = id->driver_info;
2152         dev->alt   = -1;
2153
2154         /* Checks if audio is provided by some interface */
2155         for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
2156                 uif = udev->config->interface[i];
2157                 if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2158                         dev->has_audio_class = 1;
2159                         break;
2160                 }
2161         }
2162
2163         printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
2164                    dev->has_audio_class ? "Has" : "Doesn't have");
2165
2166         /* compute alternate max packet sizes */
2167         uif = udev->actconfig->interface[0];
2168
2169         dev->num_alt = uif->num_altsetting;
2170         em28xx_info("Alternate settings: %i\n", dev->num_alt);
2171 /*      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)* */
2172         dev->alt_max_pkt_size = kmalloc(32 * dev->num_alt, GFP_KERNEL);
2173
2174         if (dev->alt_max_pkt_size == NULL) {
2175                 em28xx_errdev("out of memory!\n");
2176                 em28xx_devused &= ~(1<<nr);
2177                 kfree(dev);
2178                 return -ENOMEM;
2179         }
2180
2181         for (i = 0; i < dev->num_alt ; i++) {
2182                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
2183                                                         wMaxPacketSize);
2184                 dev->alt_max_pkt_size[i] =
2185                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
2186                 em28xx_info("Alternate setting %i, max size= %i\n", i,
2187                                                 dev->alt_max_pkt_size[i]);
2188         }
2189
2190         if ((card[nr] >= 0) && (card[nr] < em28xx_bcount))
2191                 dev->model = card[nr];
2192
2193         /* allocate device struct */
2194         retval = em28xx_init_dev(&dev, udev, nr);
2195         if (retval)
2196                 return retval;
2197
2198         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
2199
2200         /* save our data pointer in this interface device */
2201         usb_set_intfdata(interface, dev);
2202
2203         request_modules(dev);
2204
2205         return 0;
2206 }
2207
2208 /*
2209  * em28xx_usb_disconnect()
2210  * called when the device gets diconencted
2211  * video device will be unregistered on v4l2_close in case it is still open
2212  */
2213 static void em28xx_usb_disconnect(struct usb_interface *interface)
2214 {
2215         struct em28xx *dev;
2216         struct em28xx_ops *ops = NULL;
2217
2218         dev = usb_get_intfdata(interface);
2219         usb_set_intfdata(interface, NULL);
2220
2221         if (!dev)
2222                 return;
2223
2224         em28xx_info("disconnecting %s\n", dev->vdev->name);
2225
2226         /* wait until all current v4l2 io is finished then deallocate
2227            resources */
2228         mutex_lock(&dev->lock);
2229
2230         wake_up_interruptible_all(&dev->open);
2231
2232         if (dev->users) {
2233                 em28xx_warn
2234                     ("device /dev/video%d is open! Deregistration and memory "
2235                      "deallocation are deferred on close.\n",
2236                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
2237
2238                 dev->state |= DEV_MISCONFIGURED;
2239                 em28xx_uninit_isoc(dev);
2240                 dev->state |= DEV_DISCONNECTED;
2241                 wake_up_interruptible(&dev->wait_frame);
2242                 wake_up_interruptible(&dev->wait_stream);
2243         } else {
2244                 dev->state |= DEV_DISCONNECTED;
2245                 em28xx_release_resources(dev);
2246         }
2247         mutex_unlock(&dev->lock);
2248
2249         mutex_lock(&em28xx_extension_devlist_lock);
2250         if (!list_empty(&em28xx_extension_devlist)) {
2251                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2252                         ops->fini(dev);
2253                 }
2254         }
2255         mutex_unlock(&em28xx_extension_devlist_lock);
2256
2257         if (!dev->users) {
2258                 kfree(dev->alt_max_pkt_size);
2259                 kfree(dev);
2260         }
2261 }
2262
2263 static struct usb_driver em28xx_usb_driver = {
2264         .name = "em28xx",
2265         .probe = em28xx_usb_probe,
2266         .disconnect = em28xx_usb_disconnect,
2267         .id_table = em28xx_id_table,
2268 };
2269
2270 static int __init em28xx_module_init(void)
2271 {
2272         int result;
2273
2274         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
2275                (EM28XX_VERSION_CODE >> 16) & 0xff,
2276                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
2277 #ifdef SNAPSHOT
2278         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
2279                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
2280 #endif
2281
2282         /* register this driver with the USB subsystem */
2283         result = usb_register(&em28xx_usb_driver);
2284         if (result)
2285                 em28xx_err(DRIVER_NAME
2286                            " usb_register failed. Error number %d.\n", result);
2287
2288         return result;
2289 }
2290
2291 static void __exit em28xx_module_exit(void)
2292 {
2293         /* deregister this driver with the USB subsystem */
2294         usb_deregister(&em28xx_usb_driver);
2295 }
2296
2297 module_init(em28xx_module_init);
2298 module_exit(em28xx_module_exit);