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 v4l2_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         .release = cx18_v4l2_close,
  47         .poll = cx18_v4l2_enc_poll,
  48 };
  49
  50 /* offset from 0 to register ts v4l2 minors on */
  51 #define CX18_V4L2_ENC_TS_OFFSET   16
  52 /* offset from 0 to register pcm v4l2 minors on */
  53 #define CX18_V4L2_ENC_PCM_OFFSET  24
  54 /* offset from 0 to register yuv v4l2 minors on */
  55 #define CX18_V4L2_ENC_YUV_OFFSET  32
  56
  57 static struct {
  58         const char *name;
  59         int vfl_type;
  60         int num_offset;
  61         int dma;
  62         enum v4l2_buf_type buf_type;
  63 } cx18_stream_info[] = {
  64         {       /* CX18_ENC_STREAM_TYPE_MPG */
  65                 "encoder MPEG",
  66                 VFL_TYPE_GRABBER, 0,
  67                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  68         },
  69         {       /* CX18_ENC_STREAM_TYPE_TS */
  70                 "TS",
  71                 VFL_TYPE_GRABBER, -1,
  72                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  73         },
  74         {       /* CX18_ENC_STREAM_TYPE_YUV */
  75                 "encoder YUV",
  76                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET,
  77                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  78         },
  79         {       /* CX18_ENC_STREAM_TYPE_VBI */
  80                 "encoder VBI",
  81                 VFL_TYPE_VBI, 0,
  82                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE,
  83         },
  84         {       /* CX18_ENC_STREAM_TYPE_PCM */
  85                 "encoder PCM audio",
  86                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET,
  87                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE,
  88         },
  89         {       /* CX18_ENC_STREAM_TYPE_IDX */
  90                 "encoder IDX",
  91                 VFL_TYPE_GRABBER, -1,
  92                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  93         },
  94         {       /* CX18_ENC_STREAM_TYPE_RAD */
  95                 "encoder radio",
  96                 VFL_TYPE_RADIO, 0,
  97                 PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE,
  98         },
  99 };
 100
 101 static void cx18_stream_init(struct cx18 *cx, int type)
 102 {
 103         struct cx18_stream *s = &cx->streams[type];
 104         struct video_device *dev = s->v4l2dev;
 105
 106         /* we need to keep v4l2dev, so restore it afterwards */
 107         memset(s, 0, sizeof(*s));
 108         s->v4l2dev = dev;
 109
 110         /* initialize cx18_stream fields */
 111         s->cx = cx;
 112         s->type = type;
 113         s->name = cx18_stream_info[type].name;
 114         s->handle = CX18_INVALID_TASK_HANDLE;
 115
 116         s->dma = cx18_stream_info[type].dma;
 117         s->buffers = cx->stream_buffers[type];
 118         s->buf_size = cx->stream_buf_size[type];
 119
 120         mutex_init(&s->qlock);
 121         init_waitqueue_head(&s->waitq);
 122         s->id = -1;
 123         cx18_queue_init(&s->q_free);
 124         cx18_queue_init(&s->q_busy);
 125         cx18_queue_init(&s->q_full);
 126 }
 127
 128 static int cx18_prep_dev(struct cx18 *cx, int type)
 129 {
 130         struct cx18_stream *s = &cx->streams[type];
 131         u32 cap = cx->v4l2_cap;
 132         int num_offset = cx18_stream_info[type].num_offset;
 133         int num = cx->num + cx18_first_minor + num_offset;
 134
 135         /* These four fields are always initialized. If v4l2dev == NULL, then
 136            this stream is not in use. In that case no other fields but these
 137            four can be used. */
 138         s->v4l2dev = NULL;
 139         s->cx = cx;
 140         s->type = type;
 141         s->name = cx18_stream_info[type].name;
 142
 143         /* Check whether the radio is supported */
 144         if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO))
 145                 return 0;
 146
 147         /* Check whether VBI is supported */
 148         if (type == CX18_ENC_STREAM_TYPE_VBI &&
 149             !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE)))
 150                 return 0;
 151
 152         /* User explicitly selected 0 buffers for these streams, so don't
 153            create them. */
 154         if (cx18_stream_info[type].dma != PCI_DMA_NONE &&
 155             cx->stream_buffers[type] == 0) {
 156                 CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name);
 157                 return 0;
 158         }
 159
 160         cx18_stream_init(cx, type);
 161
 162         if (num_offset == -1)
 163                 return 0;
 164
 165         /* allocate and initialize the v4l2 video device structure */
 166         s->v4l2dev = video_device_alloc();
 167         if (s->v4l2dev == NULL) {
 168                 CX18_ERR("Couldn't allocate v4l2 video_device for %s\n",
 169                                 s->name);
 170                 return -ENOMEM;
 171         }
 172
 173         snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d",
 174                         cx->num);
 175
 176         s->v4l2dev->num = num;
 177         s->v4l2dev->parent = &cx->dev->dev;
 178         s->v4l2dev->fops = &cx18_v4l2_enc_fops;
 179         s->v4l2dev->release = video_device_release;
 180         s->v4l2dev->tvnorms = V4L2_STD_ALL;
 181         cx18_set_funcs(s->v4l2dev);
 182         return 0;
 183 }
 184
 185 /* Initialize v4l2 variables and register v4l2 devices */
 186 int cx18_streams_setup(struct cx18 *cx)
 187 {
 188         int type, ret;
 189
 190         /* Setup V4L2 Devices */
 191         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 192                 /* Prepare device */
 193                 ret = cx18_prep_dev(cx, type);
 194                 if (ret < 0)
 195                         break;
 196
 197                 /* Allocate Stream */
 198                 ret = cx18_stream_alloc(&cx->streams[type]);
 199                 if (ret < 0)
 200                         break;
 201         }
 202         if (type == CX18_MAX_STREAMS)
 203                 return 0;
 204
 205         /* One or more streams could not be initialized. Clean 'em all up. */
 206         cx18_streams_cleanup(cx, 0);
 207         return ret;
 208 }
 209
 210 static int cx18_reg_dev(struct cx18 *cx, int type)
 211 {
 212         struct cx18_stream *s = &cx->streams[type];
 213         int vfl_type = cx18_stream_info[type].vfl_type;
 214         int num, ret;
 215
 216         /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
 217          * We need a VFL_TYPE_TS defined.
 218          */
 219         if (strcmp("TS", s->name) == 0) {
 220                 /* just return if no DVB is supported */
 221                 if ((cx->card->hw_all & CX18_HW_DVB) == 0)
 222                         return 0;
 223                 ret = cx18_dvb_register(s);
 224                 if (ret < 0) {
 225                         CX18_ERR("DVB failed to register\n");
 226                         return ret;
 227                 }
 228         }
 229
 230         if (s->v4l2dev == NULL)
 231                 return 0;
 232
 233         num = s->v4l2dev->num;
 234         /* card number + user defined offset + device offset */
 235         if (type != CX18_ENC_STREAM_TYPE_MPG) {
 236                 struct cx18_stream *s_mpg = &cx->streams[CX18_ENC_STREAM_TYPE_MPG];
 237
 238                 if (s_mpg->v4l2dev)
 239                         num = s_mpg->v4l2dev->num + cx18_stream_info[type].num_offset;
 240         }
 241
 242         /* Register device. First try the desired minor, then any free one. */
 243         ret = video_register_device(s->v4l2dev, vfl_type, num);
 244         if (ret < 0) {
 245                 CX18_ERR("Couldn't register v4l2 device for %s kernel number %d\n",
 246                         s->name, num);
 247                 video_device_release(s->v4l2dev);
 248                 s->v4l2dev = NULL;
 249                 return ret;
 250         }
 251         num = s->v4l2dev->num;
 252
 253         switch (vfl_type) {
 254         case VFL_TYPE_GRABBER:
 255                 CX18_INFO("Registered device video%d for %s (%d x %d kB)\n",
 256                           num, s->name, cx->stream_buffers[type],
 257                           cx->stream_buf_size[type]/1024);
 258                 break;
 259
 260         case VFL_TYPE_RADIO:
 261                 CX18_INFO("Registered device radio%d for %s\n",
 262                         num, s->name);
 263                 break;
 264
 265         case VFL_TYPE_VBI:
 266                 if (cx->stream_buffers[type])
 267                         CX18_INFO("Registered device vbi%d for %s "
 268                                   "(%d x %d bytes)\n",
 269                                   num, s->name, cx->stream_buffers[type],
 270                                   cx->stream_buf_size[type]);
 271                 else
 272                         CX18_INFO("Registered device vbi%d for %s\n",
 273                                 num, s->name);
 274                 break;
 275         }
 276
 277         return 0;
 278 }
 279
 280 /* Register v4l2 devices */
 281 int cx18_streams_register(struct cx18 *cx)
 282 {
 283         int type;
 284         int err;
 285         int ret = 0;
 286
 287         /* Register V4L2 devices */
 288         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 289                 err = cx18_reg_dev(cx, type);
 290                 if (err && ret == 0)
 291                         ret = err;
 292         }
 293
 294         if (ret == 0)
 295                 return 0;
 296
 297         /* One or more streams could not be initialized. Clean 'em all up. */
 298         cx18_streams_cleanup(cx, 1);
 299         return ret;
 300 }
 301
 302 /* Unregister v4l2 devices */
 303 void cx18_streams_cleanup(struct cx18 *cx, int unregister)
 304 {
 305         struct video_device *vdev;
 306         int type;
 307
 308         /* Teardown all streams */
 309         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 310                 if (cx->streams[type].dvb.enabled) {
 311                         cx18_dvb_unregister(&cx->streams[type]);
 312                         cx->streams[type].dvb.enabled = false;
 313                 }
 314
 315                 vdev = cx->streams[type].v4l2dev;
 316
 317                 cx->streams[type].v4l2dev = NULL;
 318                 if (vdev == NULL)
 319                         continue;
 320
 321                 cx18_stream_free(&cx->streams[type]);
 322
 323                 /* Unregister or release device */
 324                 if (unregister)
 325                         video_unregister_device(vdev);
 326                 else
 327                         video_device_release(vdev);
 328         }
 329 }
 330
 331 static void cx18_vbi_setup(struct cx18_stream *s)
 332 {
 333         struct cx18 *cx = s->cx;
 334         int raw = cx18_raw_vbi(cx);
 335         u32 data[CX2341X_MBOX_MAX_DATA];
 336         int lines;
 337
 338         if (cx->is_60hz) {
 339                 cx->vbi.count = 12;
 340                 cx->vbi.start[0] = 10;
 341                 cx->vbi.start[1] = 273;
 342         } else {        /* PAL/SECAM */
 343                 cx->vbi.count = 18;
 344                 cx->vbi.start[0] = 6;
 345                 cx->vbi.start[1] = 318;
 346         }
 347
 348         /* setup VBI registers */
 349         cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);
 350
 351         /* determine number of lines and total number of VBI bytes.
 352            A raw line takes 1444 bytes: 4 byte SAV code + 2 * 720
 353            A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal
 354            header, 42 data bytes + checksum (to be confirmed) */
 355         if (raw) {
 356                 lines = cx->vbi.count * 2;
 357         } else {
 358                 lines = cx->is_60hz ? 24 : 38;
 359                 if (cx->is_60hz)
 360                         lines += 2;
 361         }
 362
 363         cx->vbi.enc_size = lines *
 364                 (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 365
 366         data[0] = s->handle;
 367         /* Lines per field */
 368         data[1] = (lines / 2) | ((lines / 2) << 16);
 369         /* bytes per line */
 370         data[2] = (raw ? cx->vbi.raw_decoder_line_size
 371                        : cx->vbi.sliced_decoder_line_size);
 372         /* Every X number of frames a VBI interrupt arrives
 373            (frames as in 25 or 30 fps) */
 374         data[3] = 1;
 375         /* Setup VBI for the cx25840 digitizer */
 376         if (raw) {
 377                 data[4] = 0x20602060;
 378                 data[5] = 0x307090d0;
 379         } else {
 380                 data[4] = 0xB0F0B0F0;
 381                 data[5] = 0xA0E0A0E0;
 382         }
 383
 384         CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
 385                         data[0], data[1], data[2], data[3], data[4], data[5]);
 386
 387         if (s->type == CX18_ENC_STREAM_TYPE_VBI)
 388                 cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
 389 }
 390
 391 struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
 392                                           struct cx18_buffer *buf)
 393 {
 394         struct cx18 *cx = s->cx;
 395         struct cx18_queue *q;
 396
 397         /* Don't give it to the firmware, if we're not running a capture */
 398         if (s->handle == CX18_INVALID_TASK_HANDLE ||
 399             !test_bit(CX18_F_S_STREAMING, &s->s_flags))
 400                 return cx18_enqueue(s, buf, &s->q_free);
 401
 402         q = cx18_enqueue(s, buf, &s->q_busy);
 403         if (q != &s->q_busy)
 404                 return q; /* The firmware has the max buffers it can handle */
 405
 406         cx18_buf_sync_for_device(s, buf);
 407         cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
 408                   (void __iomem *) &cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
 409                   1, buf->id, s->buf_size);
 410         return q;
 411 }
 412
 413 void cx18_stream_load_fw_queue(struct cx18_stream *s)
 414 {
 415         struct cx18_queue *q;
 416         struct cx18_buffer *buf;
 417
 418         if (atomic_read(&s->q_free.buffers) == 0 ||
 419             atomic_read(&s->q_busy.buffers) >= CX18_MAX_FW_MDLS_PER_STREAM)
 420                 return;
 421
 422         /* Move from q_free to q_busy notifying the firmware, until the limit */
 423         do {
 424                 buf = cx18_dequeue(s, &s->q_free);
 425                 if (buf == NULL)
 426                         break;
 427                 q = cx18_stream_put_buf_fw(s, buf);
 428         } while (atomic_read(&s->q_busy.buffers) < CX18_MAX_FW_MDLS_PER_STREAM
 429                  && q == &s->q_busy);
 430 }
 431
 432 int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 433 {
 434         u32 data[MAX_MB_ARGUMENTS];
 435         struct cx18 *cx = s->cx;
 436         struct cx18_buffer *buf;
 437         int ts = 0;
 438         int captype = 0;
 439
 440         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 441                 return -EINVAL;
 442
 443         CX18_DEBUG_INFO("Start encoder stream %s\n", s->name);
 444
 445         switch (s->type) {
 446         case CX18_ENC_STREAM_TYPE_MPG:
 447                 captype = CAPTURE_CHANNEL_TYPE_MPEG;
 448                 cx->mpg_data_received = cx->vbi_data_inserted = 0;
 449                 cx->dualwatch_jiffies = jiffies;
 450                 cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300;
 451                 cx->search_pack_header = 0;
 452                 break;
 453
 454         case CX18_ENC_STREAM_TYPE_TS:
 455                 captype = CAPTURE_CHANNEL_TYPE_TS;
 456                 ts = 1;
 457                 break;
 458         case CX18_ENC_STREAM_TYPE_YUV:
 459                 captype = CAPTURE_CHANNEL_TYPE_YUV;
 460                 break;
 461         case CX18_ENC_STREAM_TYPE_PCM:
 462                 captype = CAPTURE_CHANNEL_TYPE_PCM;
 463                 break;
 464         case CX18_ENC_STREAM_TYPE_VBI:
 465                 captype = cx18_raw_vbi(cx) ?
 466                      CAPTURE_CHANNEL_TYPE_VBI : CAPTURE_CHANNEL_TYPE_SLICED_VBI;
 467                 cx->vbi.frame = 0;
 468                 cx->vbi.inserted_frame = 0;
 469                 memset(cx->vbi.sliced_mpeg_size,
 470                         0, sizeof(cx->vbi.sliced_mpeg_size));
 471                 break;
 472         default:
 473                 return -EINVAL;
 474         }
 475
 476         /* mute/unmute video */
 477         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
 478                   s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));
 479
 480         /* Clear Streamoff flags in case left from last capture */
 481         clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 482
 483         cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE);
 484         s->handle = data[0];
 485         cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);
 486
 487         if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
 488                 struct cx18_api_func_private priv;
 489
 490                 /* Stuff from Windows, we don't know what it is */
 491                 cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
 492                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
 493                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
 494                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
 495                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);
 496
 497                 cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
 498                                s->handle, cx->digitizer, cx->digitizer);
 499
 500                 /* Setup VBI */
 501                 if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
 502                         cx18_vbi_setup(s);
 503
 504                 /* assign program index info.
 505                    Mask 7: select I/P/B, Num_req: 400 max */
 506                 cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);
 507
 508                 /* Setup API for Stream */
 509                 priv.cx = cx;
 510                 priv.s = s;
 511                 cx2341x_update(&priv, cx18_api_func, NULL, &cx->params);
 512         }
 513
 514         if (atomic_read(&cx->tot_capturing) == 0) {
 515                 clear_bit(CX18_F_I_EOS, &cx->i_flags);
 516                 cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK);
 517         }
 518
 519         cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle,
 520                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem,
 521                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem);
 522
 523         /* Init all the cpu_mdls for this stream */
 524         cx18_flush_queues(s);
 525         mutex_lock(&s->qlock);
 526         list_for_each_entry(buf, &s->q_free.list, list) {
 527                 cx18_writel(cx, buf->dma_handle,
 528                                         &cx->scb->cpu_mdl[buf->id].paddr);
 529                 cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
 530         }
 531         mutex_unlock(&s->qlock);
 532         cx18_stream_load_fw_queue(s);
 533
 534         /* begin_capture */
 535         if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
 536                 CX18_DEBUG_WARN("Error starting capture!\n");
 537                 /* Ensure we're really not capturing before releasing MDLs */
 538                 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 539                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
 540                 else
 541                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 542                 clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 543                 /* FIXME - CX18_F_S_STREAMOFF as well? */
 544                 cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 545                 cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 546                 s->handle = CX18_INVALID_TASK_HANDLE;
 547                 if (atomic_read(&cx->tot_capturing) == 0) {
 548                         set_bit(CX18_F_I_EOS, &cx->i_flags);
 549                         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 550                 }
 551                 return -EINVAL;
 552         }
 553
 554         /* you're live! sit back and await interrupts :) */
 555         if (!ts)
 556                 atomic_inc(&cx->ana_capturing);
 557         atomic_inc(&cx->tot_capturing);
 558         return 0;
 559 }
 560
 561 void cx18_stop_all_captures(struct cx18 *cx)
 562 {
 563         int i;
 564
 565         for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) {
 566                 struct cx18_stream *s = &cx->streams[i];
 567
 568                 if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 569                         continue;
 570                 if (test_bit(CX18_F_S_STREAMING, &s->s_flags))
 571                         cx18_stop_v4l2_encode_stream(s, 0);
 572         }
 573 }
 574
 575 int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end)
 576 {
 577         struct cx18 *cx = s->cx;
 578         unsigned long then;
 579
 580         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 581                 return -EINVAL;
 582
 583         /* This function assumes that you are allowed to stop the capture
 584            and that we are actually capturing */
 585
 586         CX18_DEBUG_INFO("Stop Capture\n");
 587
 588         if (atomic_read(&cx->tot_capturing) == 0)
 589                 return 0;
 590
 591         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 592                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
 593         else
 594                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 595
 596         then = jiffies;
 597
 598         if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) {
 599                 CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n");
 600         }
 601
 602         if (s->type != CX18_ENC_STREAM_TYPE_TS)
 603                 atomic_dec(&cx->ana_capturing);
 604         atomic_dec(&cx->tot_capturing);
 605
 606         /* Clear capture and no-read bits */
 607         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 608
 609         /* Tell the CX23418 it can't use our buffers anymore */
 610         cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 611
 612         cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 613         s->handle = CX18_INVALID_TASK_HANDLE;
 614
 615         if (atomic_read(&cx->tot_capturing) > 0)
 616                 return 0;
 617
 618         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 619         wake_up(&s->waitq);
 620
 621         return 0;
 622 }
 623
 624 u32 cx18_find_handle(struct cx18 *cx)
 625 {
 626         int i;
 627
 628         /* find first available handle to be used for global settings */
 629         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 630                 struct cx18_stream *s = &cx->streams[i];
 631
 632                 if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE))
 633                         return s->handle;
 634         }
 635         return CX18_INVALID_TASK_HANDLE;
 636 }
 637
 638 struct cx18_stream *cx18_handle_to_stream(struct cx18 *cx, u32 handle)
 639 {
 640         int i;
 641         struct cx18_stream *s;
 642
 643         if (handle == CX18_INVALID_TASK_HANDLE)
 644                 return NULL;
 645
 646         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 647                 s = &cx->streams[i];
 648                 if (s->handle != handle)
 649                         continue;
 650                 if (s->v4l2dev || s->dvb.enabled)
 651                         return s;
 652         }
 653         return NULL;
 654 }