drivers/media/video/cx18/cx18-streams.c

   1 /*
   2  *  cx18 init/start/stop/exit stream functions
   3  *
   4  *  Derived from ivtv-streams.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *  Copyright (C) 2008  Andy Walls <awalls@radix.net>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  *  02111-1307  USA
  23  */
  24
  25 #include "cx18-driver.h"
  26 #include "cx18-io.h"
  27 #include "cx18-fileops.h"
  28 #include "cx18-mailbox.h"
  29 #include "cx18-i2c.h"
  30 #include "cx18-queue.h"
  31 #include "cx18-ioctl.h"
  32 #include "cx18-streams.h"
  33 #include "cx18-cards.h"
  34 #include "cx18-scb.h"
  35 #include "cx18-av-core.h"
  36 #include "cx18-dvb.h"
  37
  38 #define CX18_DSP0_INTERRUPT_MASK        0xd0004C
  39
  40 static struct file_operations cx18_v4l2_enc_fops = {
  41         .owner = THIS_MODULE,
  42         .read = cx18_v4l2_read,
  43         .open = cx18_v4l2_open,
  44         /* FIXME change to video_ioctl2 if serialization lock can be removed */
  45         .ioctl = cx18_v4l2_ioctl,
  46         .compat_ioctl = v4l_compat_ioctl32,
  47         .release = cx18_v4l2_close,
  48         .poll = cx18_v4l2_enc_poll,
  49 };
  50
  51 /* offset from 0 to register ts v4l2 minors on */
  52 #define CX18_V4L2_ENC_TS_OFFSET   16
  53 /* offset from 0 to register pcm v4l2 minors on */
  54 #define CX18_V4L2_ENC_PCM_OFFSET  24
  55 /* offset from 0 to register yuv v4l2 minors on */
  56 #define CX18_V4L2_ENC_YUV_OFFSET  32
  57
  58 static struct {
  59         const char *name;
  60         int vfl_type;
  61         int num_offset;
  62         int dma;
  63         enum v4l2_buf_type buf_type;
  64         struct file_operations *fops;
  65 } cx18_stream_info[] = {
  66         {       /* CX18_ENC_STREAM_TYPE_MPG */
  67                 "encoder MPEG",
  68                 VFL_TYPE_GRABBER, 0,
  69                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  70                 &cx18_v4l2_enc_fops
  71         },
  72         {       /* CX18_ENC_STREAM_TYPE_TS */
  73                 "TS",
  74                 VFL_TYPE_GRABBER, -1,
  75                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  76                 &cx18_v4l2_enc_fops
  77         },
  78         {       /* CX18_ENC_STREAM_TYPE_YUV */
  79                 "encoder YUV",
  80                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET,
  81                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  82                 &cx18_v4l2_enc_fops
  83         },
  84         {       /* CX18_ENC_STREAM_TYPE_VBI */
  85                 "encoder VBI",
  86                 VFL_TYPE_VBI, 0,
  87                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE,
  88                 &cx18_v4l2_enc_fops
  89         },
  90         {       /* CX18_ENC_STREAM_TYPE_PCM */
  91                 "encoder PCM audio",
  92                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET,
  93                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE,
  94                 &cx18_v4l2_enc_fops
  95         },
  96         {       /* CX18_ENC_STREAM_TYPE_IDX */
  97                 "encoder IDX",
  98                 VFL_TYPE_GRABBER, -1,
  99                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
 100                 &cx18_v4l2_enc_fops
 101         },
 102         {       /* CX18_ENC_STREAM_TYPE_RAD */
 103                 "encoder radio",
 104                 VFL_TYPE_RADIO, 0,
 105                 PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE,
 106                 &cx18_v4l2_enc_fops
 107         },
 108 };
 109
 110 static void cx18_stream_init(struct cx18 *cx, int type)
 111 {
 112         struct cx18_stream *s = &cx->streams[type];
 113         struct video_device *dev = s->v4l2dev;
 114
 115         /* we need to keep v4l2dev, so restore it afterwards */
 116         memset(s, 0, sizeof(*s));
 117         s->v4l2dev = dev;
 118
 119         /* initialize cx18_stream fields */
 120         s->cx = cx;
 121         s->type = type;
 122         s->name = cx18_stream_info[type].name;
 123         s->handle = CX18_INVALID_TASK_HANDLE;
 124
 125         s->dma = cx18_stream_info[type].dma;
 126         s->buffers = cx->stream_buffers[type];
 127         s->buf_size = cx->stream_buf_size[type];
 128
 129         mutex_init(&s->qlock);
 130         init_waitqueue_head(&s->waitq);
 131         s->id = -1;
 132         cx18_queue_init(&s->q_free);
 133         cx18_queue_init(&s->q_busy);
 134         cx18_queue_init(&s->q_full);
 135 }
 136
 137 static int cx18_prep_dev(struct cx18 *cx, int type)
 138 {
 139         struct cx18_stream *s = &cx->streams[type];
 140         u32 cap = cx->v4l2_cap;
 141         int num_offset = cx18_stream_info[type].num_offset;
 142         int num = cx->num + cx18_first_minor + num_offset;
 143
 144         /* These four fields are always initialized. If v4l2dev == NULL, then
 145            this stream is not in use. In that case no other fields but these
 146            four can be used. */
 147         s->v4l2dev = NULL;
 148         s->cx = cx;
 149         s->type = type;
 150         s->name = cx18_stream_info[type].name;
 151
 152         /* Check whether the radio is supported */
 153         if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO))
 154                 return 0;
 155
 156         /* Check whether VBI is supported */
 157         if (type == CX18_ENC_STREAM_TYPE_VBI &&
 158             !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE)))
 159                 return 0;
 160
 161         /* User explicitly selected 0 buffers for these streams, so don't
 162            create them. */
 163         if (cx18_stream_info[type].dma != PCI_DMA_NONE &&
 164             cx->stream_buffers[type] == 0) {
 165                 CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name);
 166                 return 0;
 167         }
 168
 169         cx18_stream_init(cx, type);
 170
 171         if (num_offset == -1)
 172                 return 0;
 173
 174         /* allocate and initialize the v4l2 video device structure */
 175         s->v4l2dev = video_device_alloc();
 176         if (s->v4l2dev == NULL) {
 177                 CX18_ERR("Couldn't allocate v4l2 video_device for %s\n",
 178                                 s->name);
 179                 return -ENOMEM;
 180         }
 181
 182         snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d",
 183                         cx->num);
 184
 185         s->v4l2dev->num = num;
 186         s->v4l2dev->parent = &cx->dev->dev;
 187         s->v4l2dev->fops = cx18_stream_info[type].fops;
 188         s->v4l2dev->release = video_device_release;
 189         s->v4l2dev->tvnorms = V4L2_STD_ALL;
 190         cx18_set_funcs(s->v4l2dev);
 191         return 0;
 192 }
 193
 194 /* Initialize v4l2 variables and register v4l2 devices */
 195 int cx18_streams_setup(struct cx18 *cx)
 196 {
 197         int type, ret;
 198
 199         /* Setup V4L2 Devices */
 200         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 201                 /* Prepare device */
 202                 ret = cx18_prep_dev(cx, type);
 203                 if (ret < 0)
 204                         break;
 205
 206                 /* Allocate Stream */
 207                 ret = cx18_stream_alloc(&cx->streams[type]);
 208                 if (ret < 0)
 209                         break;
 210         }
 211         if (type == CX18_MAX_STREAMS)
 212                 return 0;
 213
 214         /* One or more streams could not be initialized. Clean 'em all up. */
 215         cx18_streams_cleanup(cx, 0);
 216         return ret;
 217 }
 218
 219 static int cx18_reg_dev(struct cx18 *cx, int type)
 220 {
 221         struct cx18_stream *s = &cx->streams[type];
 222         int vfl_type = cx18_stream_info[type].vfl_type;
 223         int num, ret;
 224
 225         /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
 226          * We need a VFL_TYPE_TS defined.
 227          */
 228         if (strcmp("TS", s->name) == 0) {
 229                 /* just return if no DVB is supported */
 230                 if ((cx->card->hw_all & CX18_HW_DVB) == 0)
 231                         return 0;
 232                 ret = cx18_dvb_register(s);
 233                 if (ret < 0) {
 234                         CX18_ERR("DVB failed to register\n");
 235                         return ret;
 236                 }
 237         }
 238
 239         if (s->v4l2dev == NULL)
 240                 return 0;
 241
 242         num = s->v4l2dev->num;
 243         /* card number + user defined offset + device offset */
 244         if (type != CX18_ENC_STREAM_TYPE_MPG) {
 245                 struct cx18_stream *s_mpg = &cx->streams[CX18_ENC_STREAM_TYPE_MPG];
 246
 247                 if (s_mpg->v4l2dev)
 248                         num = s_mpg->v4l2dev->num + cx18_stream_info[type].num_offset;
 249         }
 250
 251         /* Register device. First try the desired minor, then any free one. */
 252         ret = video_register_device(s->v4l2dev, vfl_type, num);
 253         if (ret < 0) {
 254                 CX18_ERR("Couldn't register v4l2 device for %s kernel number %d\n",
 255                         s->name, num);
 256                 video_device_release(s->v4l2dev);
 257                 s->v4l2dev = NULL;
 258                 return ret;
 259         }
 260         num = s->v4l2dev->num;
 261
 262         switch (vfl_type) {
 263         case VFL_TYPE_GRABBER:
 264                 CX18_INFO("Registered device video%d for %s (%d x %d kB)\n",
 265                           num, s->name, cx->stream_buffers[type],
 266                           cx->stream_buf_size[type]/1024);
 267                 break;
 268
 269         case VFL_TYPE_RADIO:
 270                 CX18_INFO("Registered device radio%d for %s\n",
 271                         num, s->name);
 272                 break;
 273
 274         case VFL_TYPE_VBI:
 275                 if (cx->stream_buffers[type])
 276                         CX18_INFO("Registered device vbi%d for %s "
 277                                   "(%d x %d bytes)\n",
 278                                   num, s->name, cx->stream_buffers[type],
 279                                   cx->stream_buf_size[type]);
 280                 else
 281                         CX18_INFO("Registered device vbi%d for %s\n",
 282                                 num, s->name);
 283                 break;
 284         }
 285
 286         return 0;
 287 }
 288
 289 /* Register v4l2 devices */
 290 int cx18_streams_register(struct cx18 *cx)
 291 {
 292         int type;
 293         int err;
 294         int ret = 0;
 295
 296         /* Register V4L2 devices */
 297         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 298                 err = cx18_reg_dev(cx, type);
 299                 if (err && ret == 0)
 300                         ret = err;
 301         }
 302
 303         if (ret == 0)
 304                 return 0;
 305
 306         /* One or more streams could not be initialized. Clean 'em all up. */
 307         cx18_streams_cleanup(cx, 1);
 308         return ret;
 309 }
 310
 311 /* Unregister v4l2 devices */
 312 void cx18_streams_cleanup(struct cx18 *cx, int unregister)
 313 {
 314         struct video_device *vdev;
 315         int type;
 316
 317         /* Teardown all streams */
 318         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 319                 if (cx->streams[type].dvb.enabled) {
 320                         cx18_dvb_unregister(&cx->streams[type]);
 321                         cx->streams[type].dvb.enabled = false;
 322                 }
 323
 324                 vdev = cx->streams[type].v4l2dev;
 325
 326                 cx->streams[type].v4l2dev = NULL;
 327                 if (vdev == NULL)
 328                         continue;
 329
 330                 cx18_stream_free(&cx->streams[type]);
 331
 332                 /* Unregister or release device */
 333                 if (unregister)
 334                         video_unregister_device(vdev);
 335                 else
 336                         video_device_release(vdev);
 337         }
 338 }
 339
 340 static void cx18_vbi_setup(struct cx18_stream *s)
 341 {
 342         struct cx18 *cx = s->cx;
 343         int raw = cx18_raw_vbi(cx);
 344         u32 data[CX2341X_MBOX_MAX_DATA];
 345         int lines;
 346
 347         if (cx->is_60hz) {
 348                 cx->vbi.count = 12;
 349                 cx->vbi.start[0] = 10;
 350                 cx->vbi.start[1] = 273;
 351         } else {        /* PAL/SECAM */
 352                 cx->vbi.count = 18;
 353                 cx->vbi.start[0] = 6;
 354                 cx->vbi.start[1] = 318;
 355         }
 356
 357         /* setup VBI registers */
 358         cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);
 359
 360         /* determine number of lines and total number of VBI bytes.
 361            A raw line takes 1444 bytes: 4 byte SAV code + 2 * 720
 362            A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal
 363            header, 42 data bytes + checksum (to be confirmed) */
 364         if (raw) {
 365                 lines = cx->vbi.count * 2;
 366         } else {
 367                 lines = cx->is_60hz ? 24 : 38;
 368                 if (cx->is_60hz)
 369                         lines += 2;
 370         }
 371
 372         cx->vbi.enc_size = lines *
 373                 (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 374
 375         data[0] = s->handle;
 376         /* Lines per field */
 377         data[1] = (lines / 2) | ((lines / 2) << 16);
 378         /* bytes per line */
 379         data[2] = (raw ? cx->vbi.raw_decoder_line_size
 380                        : cx->vbi.sliced_decoder_line_size);
 381         /* Every X number of frames a VBI interrupt arrives
 382            (frames as in 25 or 30 fps) */
 383         data[3] = 1;
 384         /* Setup VBI for the cx25840 digitizer */
 385         if (raw) {
 386                 data[4] = 0x20602060;
 387                 data[5] = 0x307090d0;
 388         } else {
 389                 data[4] = 0xB0F0B0F0;
 390                 data[5] = 0xA0E0A0E0;
 391         }
 392
 393         CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
 394                         data[0], data[1], data[2], data[3], data[4], data[5]);
 395
 396         if (s->type == CX18_ENC_STREAM_TYPE_VBI)
 397                 cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
 398 }
 399
 400 struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
 401                                           struct cx18_buffer *buf)
 402 {
 403         struct cx18 *cx = s->cx;
 404         struct cx18_queue *q;
 405
 406         /* Don't give it to the firmware, if we're not running a capture */
 407         if (s->handle == CX18_INVALID_TASK_HANDLE ||
 408             !test_bit(CX18_F_S_STREAMING, &s->s_flags))
 409                 return cx18_enqueue(s, buf, &s->q_free);
 410
 411         q = cx18_enqueue(s, buf, &s->q_busy);
 412         if (q != &s->q_busy)
 413                 return q; /* The firmware has the max buffers it can handle */
 414
 415         cx18_buf_sync_for_device(s, buf);
 416         cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
 417                   (void __iomem *) &cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
 418                   1, buf->id, s->buf_size);
 419         return q;
 420 }
 421
 422 void cx18_stream_load_fw_queue(struct cx18_stream *s)
 423 {
 424         struct cx18_queue *q;
 425         struct cx18_buffer *buf;
 426
 427         if (atomic_read(&s->q_free.buffers) == 0 ||
 428             atomic_read(&s->q_busy.buffers) >= CX18_MAX_FW_MDLS_PER_STREAM)
 429                 return;
 430
 431         /* Move from q_free to q_busy notifying the firmware, until the limit */
 432         do {
 433                 buf = cx18_dequeue(s, &s->q_free);
 434                 if (buf == NULL)
 435                         break;
 436                 q = cx18_stream_put_buf_fw(s, buf);
 437         } while (atomic_read(&s->q_busy.buffers) < CX18_MAX_FW_MDLS_PER_STREAM
 438                  && q == &s->q_busy);
 439 }
 440
 441 int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 442 {
 443         u32 data[MAX_MB_ARGUMENTS];
 444         struct cx18 *cx = s->cx;
 445         struct cx18_buffer *buf;
 446         int ts = 0;
 447         int captype = 0;
 448
 449         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 450                 return -EINVAL;
 451
 452         CX18_DEBUG_INFO("Start encoder stream %s\n", s->name);
 453
 454         switch (s->type) {
 455         case CX18_ENC_STREAM_TYPE_MPG:
 456                 captype = CAPTURE_CHANNEL_TYPE_MPEG;
 457                 cx->mpg_data_received = cx->vbi_data_inserted = 0;
 458                 cx->dualwatch_jiffies = jiffies;
 459                 cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300;
 460                 cx->search_pack_header = 0;
 461                 break;
 462
 463         case CX18_ENC_STREAM_TYPE_TS:
 464                 captype = CAPTURE_CHANNEL_TYPE_TS;
 465                 ts = 1;
 466                 break;
 467         case CX18_ENC_STREAM_TYPE_YUV:
 468                 captype = CAPTURE_CHANNEL_TYPE_YUV;
 469                 break;
 470         case CX18_ENC_STREAM_TYPE_PCM:
 471                 captype = CAPTURE_CHANNEL_TYPE_PCM;
 472                 break;
 473         case CX18_ENC_STREAM_TYPE_VBI:
 474                 captype = cx18_raw_vbi(cx) ?
 475                      CAPTURE_CHANNEL_TYPE_VBI : CAPTURE_CHANNEL_TYPE_SLICED_VBI;
 476                 cx->vbi.frame = 0;
 477                 cx->vbi.inserted_frame = 0;
 478                 memset(cx->vbi.sliced_mpeg_size,
 479                         0, sizeof(cx->vbi.sliced_mpeg_size));
 480                 break;
 481         default:
 482                 return -EINVAL;
 483         }
 484
 485         /* mute/unmute video */
 486         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
 487                   s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));
 488
 489         /* Clear Streamoff flags in case left from last capture */
 490         clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 491
 492         cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE);
 493         s->handle = data[0];
 494         cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);
 495
 496         if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
 497                 struct cx18_api_func_private priv;
 498
 499                 /* Stuff from Windows, we don't know what it is */
 500                 cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
 501                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
 502                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
 503                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
 504                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);
 505
 506                 cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
 507                                s->handle, cx->digitizer, cx->digitizer);
 508
 509                 /* Setup VBI */
 510                 if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
 511                         cx18_vbi_setup(s);
 512
 513                 /* assign program index info.
 514                    Mask 7: select I/P/B, Num_req: 400 max */
 515                 cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);
 516
 517                 /* Setup API for Stream */
 518                 priv.cx = cx;
 519                 priv.s = s;
 520                 cx2341x_update(&priv, cx18_api_func, NULL, &cx->params);
 521         }
 522
 523         if (atomic_read(&cx->tot_capturing) == 0) {
 524                 clear_bit(CX18_F_I_EOS, &cx->i_flags);
 525                 cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK);
 526         }
 527
 528         cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle,
 529                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem,
 530                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem);
 531
 532         /* Init all the cpu_mdls for this stream */
 533         cx18_flush_queues(s);
 534         mutex_lock(&s->qlock);
 535         list_for_each_entry(buf, &s->q_free.list, list) {
 536                 cx18_writel(cx, buf->dma_handle,
 537                                         &cx->scb->cpu_mdl[buf->id].paddr);
 538                 cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
 539         }
 540         mutex_unlock(&s->qlock);
 541         cx18_stream_load_fw_queue(s);
 542
 543         /* begin_capture */
 544         if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
 545                 CX18_DEBUG_WARN("Error starting capture!\n");
 546                 /* Ensure we're really not capturing before releasing MDLs */
 547                 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 548                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
 549                 else
 550                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 551                 clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 552                 /* FIXME - CX18_F_S_STREAMOFF as well? */
 553                 cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 554                 cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 555                 s->handle = CX18_INVALID_TASK_HANDLE;
 556                 if (atomic_read(&cx->tot_capturing) == 0) {
 557                         set_bit(CX18_F_I_EOS, &cx->i_flags);
 558                         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 559                 }
 560                 return -EINVAL;
 561         }
 562
 563         /* you're live! sit back and await interrupts :) */
 564         if (!ts)
 565                 atomic_inc(&cx->ana_capturing);
 566         atomic_inc(&cx->tot_capturing);
 567         return 0;
 568 }
 569
 570 void cx18_stop_all_captures(struct cx18 *cx)
 571 {
 572         int i;
 573
 574         for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) {
 575                 struct cx18_stream *s = &cx->streams[i];
 576
 577                 if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 578                         continue;
 579                 if (test_bit(CX18_F_S_STREAMING, &s->s_flags))
 580                         cx18_stop_v4l2_encode_stream(s, 0);
 581         }
 582 }
 583
 584 int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end)
 585 {
 586         struct cx18 *cx = s->cx;
 587         unsigned long then;
 588
 589         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 590                 return -EINVAL;
 591
 592         /* This function assumes that you are allowed to stop the capture
 593            and that we are actually capturing */
 594
 595         CX18_DEBUG_INFO("Stop Capture\n");
 596
 597         if (atomic_read(&cx->tot_capturing) == 0)
 598                 return 0;
 599
 600         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 601                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
 602         else
 603                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 604
 605         then = jiffies;
 606
 607         if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) {
 608                 CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n");
 609         }
 610
 611         if (s->type != CX18_ENC_STREAM_TYPE_TS)
 612                 atomic_dec(&cx->ana_capturing);
 613         atomic_dec(&cx->tot_capturing);
 614
 615         /* Clear capture and no-read bits */
 616         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 617
 618         /* Tell the CX23418 it can't use our buffers anymore */
 619         cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 620
 621         cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 622         s->handle = CX18_INVALID_TASK_HANDLE;
 623
 624         if (atomic_read(&cx->tot_capturing) > 0)
 625                 return 0;
 626
 627         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 628         wake_up(&s->waitq);
 629
 630         return 0;
 631 }
 632
 633 u32 cx18_find_handle(struct cx18 *cx)
 634 {
 635         int i;
 636
 637         /* find first available handle to be used for global settings */
 638         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 639                 struct cx18_stream *s = &cx->streams[i];
 640
 641                 if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE))
 642                         return s->handle;
 643         }
 644         return CX18_INVALID_TASK_HANDLE;
 645 }
 646
 647 struct cx18_stream *cx18_handle_to_stream(struct cx18 *cx, u32 handle)
 648 {
 649         int i;
 650         struct cx18_stream *s;
 651
 652         if (handle == CX18_INVALID_TASK_HANDLE)
 653                 return NULL;
 654
 655         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 656                 s = &cx->streams[i];
 657                 if (s->handle != handle)
 658                         continue;
 659                 if (s->v4l2dev || s->dvb.enabled)
 660                         return s;
 661         }
 662         return NULL;
 663 }