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  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-io.h"
  26 #include "cx18-fileops.h"
  27 #include "cx18-mailbox.h"
  28 #include "cx18-i2c.h"
  29 #include "cx18-queue.h"
  30 #include "cx18-ioctl.h"
  31 #include "cx18-streams.h"
  32 #include "cx18-cards.h"
  33 #include "cx18-scb.h"
  34 #include "cx18-av-core.h"
  35 #include "cx18-dvb.h"
  36
  37 #define CX18_DSP0_INTERRUPT_MASK        0xd0004C
  38
  39 static struct file_operations cx18_v4l2_enc_fops = {
  40         .owner = THIS_MODULE,
  41         .read = cx18_v4l2_read,
  42         .open = cx18_v4l2_open,
  43         /* FIXME change to video_ioctl2 if serialization lock can be removed */
  44         .ioctl = cx18_v4l2_ioctl,
  45         .compat_ioctl = v4l_compat_ioctl32,
  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 minor_offset;
  61         int dma;
  62         enum v4l2_buf_type buf_type;
  63         struct file_operations *fops;
  64 } cx18_stream_info[] = {
  65         {       /* CX18_ENC_STREAM_TYPE_MPG */
  66                 "encoder MPEG",
  67                 VFL_TYPE_GRABBER, 0,
  68                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  69                 &cx18_v4l2_enc_fops
  70         },
  71         {       /* CX18_ENC_STREAM_TYPE_TS */
  72                 "TS",
  73                 VFL_TYPE_GRABBER, -1,
  74                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  75                 &cx18_v4l2_enc_fops
  76         },
  77         {       /* CX18_ENC_STREAM_TYPE_YUV */
  78                 "encoder YUV",
  79                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_YUV_OFFSET,
  80                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  81                 &cx18_v4l2_enc_fops
  82         },
  83         {       /* CX18_ENC_STREAM_TYPE_VBI */
  84                 "encoder VBI",
  85                 VFL_TYPE_VBI, 0,
  86                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VBI_CAPTURE,
  87                 &cx18_v4l2_enc_fops
  88         },
  89         {       /* CX18_ENC_STREAM_TYPE_PCM */
  90                 "encoder PCM audio",
  91                 VFL_TYPE_GRABBER, CX18_V4L2_ENC_PCM_OFFSET,
  92                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_PRIVATE,
  93                 &cx18_v4l2_enc_fops
  94         },
  95         {       /* CX18_ENC_STREAM_TYPE_IDX */
  96                 "encoder IDX",
  97                 VFL_TYPE_GRABBER, -1,
  98                 PCI_DMA_FROMDEVICE, V4L2_BUF_TYPE_VIDEO_CAPTURE,
  99                 &cx18_v4l2_enc_fops
 100         },
 101         {       /* CX18_ENC_STREAM_TYPE_RAD */
 102                 "encoder radio",
 103                 VFL_TYPE_RADIO, 0,
 104                 PCI_DMA_NONE, V4L2_BUF_TYPE_PRIVATE,
 105                 &cx18_v4l2_enc_fops
 106         },
 107 };
 108
 109 static void cx18_stream_init(struct cx18 *cx, int type)
 110 {
 111         struct cx18_stream *s = &cx->streams[type];
 112         struct video_device *dev = s->v4l2dev;
 113         u32 max_size = cx->options.megabytes[type] * 1024 * 1024;
 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->buf_size = cx->stream_buf_size[type];
 127         if (s->buf_size)
 128                 s->buffers = max_size / s->buf_size;
 129         if (s->buffers > 63) {
 130                 /* Each stream has a maximum of 63 buffers,
 131                    ensure we do not exceed that. */
 132                 s->buffers = 63;
 133                 s->buf_size = (max_size / s->buffers) & ~0xfff;
 134         }
 135         spin_lock_init(&s->qlock);
 136         init_waitqueue_head(&s->waitq);
 137         s->id = -1;
 138         cx18_queue_init(&s->q_free);
 139         cx18_queue_init(&s->q_full);
 140         cx18_queue_init(&s->q_io);
 141 }
 142
 143 static int cx18_prep_dev(struct cx18 *cx, int type)
 144 {
 145         struct cx18_stream *s = &cx->streams[type];
 146         u32 cap = cx->v4l2_cap;
 147         int minor_offset = cx18_stream_info[type].minor_offset;
 148         int minor;
 149
 150         /* These four fields are always initialized. If v4l2dev == NULL, then
 151            this stream is not in use. In that case no other fields but these
 152            four can be used. */
 153         s->v4l2dev = NULL;
 154         s->cx = cx;
 155         s->type = type;
 156         s->name = cx18_stream_info[type].name;
 157
 158         /* Check whether the radio is supported */
 159         if (type == CX18_ENC_STREAM_TYPE_RAD && !(cap & V4L2_CAP_RADIO))
 160                 return 0;
 161
 162         /* Check whether VBI is supported */
 163         if (type == CX18_ENC_STREAM_TYPE_VBI &&
 164             !(cap & (V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_CAPTURE)))
 165                 return 0;
 166
 167         /* card number + user defined offset + device offset */
 168         minor = cx->num + cx18_first_minor + minor_offset;
 169
 170         /* User explicitly selected 0 buffers for these streams, so don't
 171            create them. */
 172         if (cx18_stream_info[type].dma != PCI_DMA_NONE &&
 173             cx->options.megabytes[type] == 0) {
 174                 CX18_INFO("Disabled %s device\n", cx18_stream_info[type].name);
 175                 return 0;
 176         }
 177
 178         cx18_stream_init(cx, type);
 179
 180         if (minor_offset == -1)
 181                 return 0;
 182
 183         /* allocate and initialize the v4l2 video device structure */
 184         s->v4l2dev = video_device_alloc();
 185         if (s->v4l2dev == NULL) {
 186                 CX18_ERR("Couldn't allocate v4l2 video_device for %s\n",
 187                                 s->name);
 188                 return -ENOMEM;
 189         }
 190
 191         snprintf(s->v4l2dev->name, sizeof(s->v4l2dev->name), "cx18-%d",
 192                         cx->num);
 193
 194         s->v4l2dev->minor = minor;
 195         s->v4l2dev->parent = &cx->dev->dev;
 196         s->v4l2dev->fops = cx18_stream_info[type].fops;
 197         s->v4l2dev->release = video_device_release;
 198         s->v4l2dev->tvnorms = V4L2_STD_ALL;
 199         cx18_set_funcs(s->v4l2dev);
 200         return 0;
 201 }
 202
 203 /* Initialize v4l2 variables and register v4l2 devices */
 204 int cx18_streams_setup(struct cx18 *cx)
 205 {
 206         int type;
 207
 208         /* Setup V4L2 Devices */
 209         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 210                 /* Prepare device */
 211                 if (cx18_prep_dev(cx, type))
 212                         break;
 213
 214                 /* Allocate Stream */
 215                 if (cx18_stream_alloc(&cx->streams[type]))
 216                         break;
 217         }
 218         if (type == CX18_MAX_STREAMS)
 219                 return 0;
 220
 221         /* One or more streams could not be initialized. Clean 'em all up. */
 222         cx18_streams_cleanup(cx, 0);
 223         return -ENOMEM;
 224 }
 225
 226 static int cx18_reg_dev(struct cx18 *cx, int type)
 227 {
 228         struct cx18_stream *s = &cx->streams[type];
 229         int vfl_type = cx18_stream_info[type].vfl_type;
 230         int minor;
 231
 232         /* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
 233          * We need a VFL_TYPE_TS defined.
 234          */
 235         if (strcmp("TS", s->name) == 0) {
 236                 /* just return if no DVB is supported */
 237                 if ((cx->card->hw_all & CX18_HW_DVB) == 0)
 238                         return 0;
 239                 if (cx18_dvb_register(s) < 0) {
 240                         CX18_ERR("DVB failed to register\n");
 241                         return -EINVAL;
 242                 }
 243         }
 244
 245         if (s->v4l2dev == NULL)
 246                 return 0;
 247
 248         minor = s->v4l2dev->minor;
 249
 250         /* Register device. First try the desired minor, then any free one. */
 251         if (video_register_device(s->v4l2dev, vfl_type, minor) &&
 252                         video_register_device(s->v4l2dev, vfl_type, -1)) {
 253                 CX18_ERR("Couldn't register v4l2 device for %s minor %d\n",
 254                         s->name, minor);
 255                 video_device_release(s->v4l2dev);
 256                 s->v4l2dev = NULL;
 257                 return -ENOMEM;
 258         }
 259         minor = s->v4l2dev->minor;
 260
 261         switch (vfl_type) {
 262         case VFL_TYPE_GRABBER:
 263                 CX18_INFO("Registered device video%d for %s (%d MB)\n",
 264                         minor, s->name, cx->options.megabytes[type]);
 265                 break;
 266
 267         case VFL_TYPE_RADIO:
 268                 CX18_INFO("Registered device radio%d for %s\n",
 269                         minor - MINOR_VFL_TYPE_RADIO_MIN, s->name);
 270                 break;
 271
 272         case VFL_TYPE_VBI:
 273                 if (cx->options.megabytes[type])
 274                         CX18_INFO("Registered device vbi%d for %s (%d MB)\n",
 275                                 minor - MINOR_VFL_TYPE_VBI_MIN,
 276                                 s->name, cx->options.megabytes[type]);
 277                 else
 278                         CX18_INFO("Registered device vbi%d for %s\n",
 279                                 minor - MINOR_VFL_TYPE_VBI_MIN, s->name);
 280                 break;
 281         }
 282
 283         return 0;
 284 }
 285
 286 /* Register v4l2 devices */
 287 int cx18_streams_register(struct cx18 *cx)
 288 {
 289         int type;
 290         int err = 0;
 291
 292         /* Register V4L2 devices */
 293         for (type = 0; type < CX18_MAX_STREAMS; type++)
 294                 err |= cx18_reg_dev(cx, type);
 295
 296         if (err == 0)
 297                 return 0;
 298
 299         /* One or more streams could not be initialized. Clean 'em all up. */
 300         cx18_streams_cleanup(cx, 1);
 301         return -ENOMEM;
 302 }
 303
 304 /* Unregister v4l2 devices */
 305 void cx18_streams_cleanup(struct cx18 *cx, int unregister)
 306 {
 307         struct video_device *vdev;
 308         int type;
 309
 310         /* Teardown all streams */
 311         for (type = 0; type < CX18_MAX_STREAMS; type++) {
 312                 if (cx->streams[type].dvb.enabled) {
 313                         cx18_dvb_unregister(&cx->streams[type]);
 314                         cx->streams[type].dvb.enabled = false;
 315                 }
 316
 317                 vdev = cx->streams[type].v4l2dev;
 318
 319                 cx->streams[type].v4l2dev = NULL;
 320                 if (vdev == NULL)
 321                         continue;
 322
 323                 cx18_stream_free(&cx->streams[type]);
 324
 325                 /* Unregister or release device */
 326                 if (unregister)
 327                         video_unregister_device(vdev);
 328                 else
 329                         video_device_release(vdev);
 330         }
 331 }
 332
 333 static void cx18_vbi_setup(struct cx18_stream *s)
 334 {
 335         struct cx18 *cx = s->cx;
 336         int raw = cx->vbi.sliced_in->service_set == 0;
 337         u32 data[CX2341X_MBOX_MAX_DATA];
 338         int lines;
 339
 340         if (cx->is_60hz) {
 341                 cx->vbi.count = 12;
 342                 cx->vbi.start[0] = 10;
 343                 cx->vbi.start[1] = 273;
 344         } else {        /* PAL/SECAM */
 345                 cx->vbi.count = 18;
 346                 cx->vbi.start[0] = 6;
 347                 cx->vbi.start[1] = 318;
 348         }
 349
 350         /* setup VBI registers */
 351         cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);
 352
 353         /* determine number of lines and total number of VBI bytes.
 354            A raw line takes 1443 bytes: 2 * 720 + 4 byte frame header - 1
 355            The '- 1' byte is probably an unused U or V byte. Or something...
 356            A sliced line takes 51 bytes: 4 byte frame header, 4 byte internal
 357            header, 42 data bytes + checksum (to be confirmed) */
 358         if (raw) {
 359                 lines = cx->vbi.count * 2;
 360         } else {
 361                 lines = cx->is_60hz ? 24 : 38;
 362                 if (cx->is_60hz)
 363                         lines += 2;
 364         }
 365
 366         cx->vbi.enc_size = lines *
 367                 (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 368
 369         data[0] = s->handle;
 370         /* Lines per field */
 371         data[1] = (lines / 2) | ((lines / 2) << 16);
 372         /* bytes per line */
 373         data[2] = (raw ? cx->vbi.raw_size : cx->vbi.sliced_size);
 374         /* Every X number of frames a VBI interrupt arrives
 375            (frames as in 25 or 30 fps) */
 376         data[3] = 1;
 377         /* Setup VBI for the cx25840 digitizer */
 378         if (raw) {
 379                 data[4] = 0x20602060;
 380                 data[5] = 0x30703070;
 381         } else {
 382                 data[4] = 0xB0F0B0F0;
 383                 data[5] = 0xA0E0A0E0;
 384         }
 385
 386         CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
 387                         data[0], data[1], data[2], data[3], data[4], data[5]);
 388
 389         if (s->type == CX18_ENC_STREAM_TYPE_VBI)
 390                 cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
 391 }
 392
 393 int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 394 {
 395         u32 data[MAX_MB_ARGUMENTS];
 396         struct cx18 *cx = s->cx;
 397         struct list_head *p;
 398         int ts = 0;
 399         int captype = 0;
 400
 401         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 402                 return -EINVAL;
 403
 404         CX18_DEBUG_INFO("Start encoder stream %s\n", s->name);
 405
 406         switch (s->type) {
 407         case CX18_ENC_STREAM_TYPE_MPG:
 408                 captype = CAPTURE_CHANNEL_TYPE_MPEG;
 409                 cx->mpg_data_received = cx->vbi_data_inserted = 0;
 410                 cx->dualwatch_jiffies = jiffies;
 411                 cx->dualwatch_stereo_mode = cx->params.audio_properties & 0x300;
 412                 cx->search_pack_header = 0;
 413                 break;
 414
 415         case CX18_ENC_STREAM_TYPE_TS:
 416                 captype = CAPTURE_CHANNEL_TYPE_TS;
 417                 ts = 1;
 418                 break;
 419         case CX18_ENC_STREAM_TYPE_YUV:
 420                 captype = CAPTURE_CHANNEL_TYPE_YUV;
 421                 break;
 422         case CX18_ENC_STREAM_TYPE_PCM:
 423                 captype = CAPTURE_CHANNEL_TYPE_PCM;
 424                 break;
 425         case CX18_ENC_STREAM_TYPE_VBI:
 426                 captype = cx->vbi.sliced_in->service_set ?
 427                     CAPTURE_CHANNEL_TYPE_SLICED_VBI : CAPTURE_CHANNEL_TYPE_VBI;
 428                 cx->vbi.frame = 0;
 429                 cx->vbi.inserted_frame = 0;
 430                 memset(cx->vbi.sliced_mpeg_size,
 431                         0, sizeof(cx->vbi.sliced_mpeg_size));
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         /* mute/unmute video */
 438         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
 439                   s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));
 440
 441         /* Clear Streamoff flags in case left from last capture */
 442         clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 443
 444         cx18_vapi_result(cx, data, CX18_CREATE_TASK, 1, CPU_CMD_MASK_CAPTURE);
 445         s->handle = data[0];
 446         cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);
 447
 448         if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
 449                 /* Stuff from Windows, we don't know what it is */
 450                 cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
 451                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
 452                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
 453                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
 454                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);
 455
 456                 cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
 457                                s->handle, cx->digitizer, cx->digitizer);
 458
 459                 /* Setup VBI */
 460                 if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
 461                         cx18_vbi_setup(s);
 462
 463                 /* assign program index info.
 464                    Mask 7: select I/P/B, Num_req: 400 max */
 465                 cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);
 466
 467                 /* Setup API for Stream */
 468                 cx2341x_update(cx, cx18_api_func, NULL, &cx->params);
 469         }
 470
 471         if (atomic_read(&cx->tot_capturing) == 0) {
 472                 clear_bit(CX18_F_I_EOS, &cx->i_flags);
 473                 cx18_write_reg(cx, 7, CX18_DSP0_INTERRUPT_MASK);
 474         }
 475
 476         cx18_vapi(cx, CX18_CPU_DE_SET_MDL_ACK, 3, s->handle,
 477                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][0] - cx->enc_mem,
 478                 (void __iomem *)&cx->scb->cpu_mdl_ack[s->type][1] - cx->enc_mem);
 479
 480         list_for_each(p, &s->q_free.list) {
 481                 struct cx18_buffer *buf = list_entry(p, struct cx18_buffer, list);
 482
 483                 cx18_writel(cx, buf->dma_handle,
 484                                         &cx->scb->cpu_mdl[buf->id].paddr);
 485                 cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
 486                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
 487                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
 488                         1, buf->id, s->buf_size);
 489         }
 490         /* begin_capture */
 491         if (cx18_vapi(cx, CX18_CPU_CAPTURE_START, 1, s->handle)) {
 492                 CX18_DEBUG_WARN("Error starting capture!\n");
 493                 /* Ensure we're really not capturing before releasing MDLs */
 494                 if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 495                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, 1);
 496                 else
 497                         cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 498                 cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 499                 cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 500                 /* FIXME - clean-up DSP0_INT mask, i_flags, s_flags, etc. */
 501                 return -EINVAL;
 502         }
 503
 504         /* you're live! sit back and await interrupts :) */
 505         if (!ts)
 506                 atomic_inc(&cx->ana_capturing);
 507         atomic_inc(&cx->tot_capturing);
 508         return 0;
 509 }
 510
 511 void cx18_stop_all_captures(struct cx18 *cx)
 512 {
 513         int i;
 514
 515         for (i = CX18_MAX_STREAMS - 1; i >= 0; i--) {
 516                 struct cx18_stream *s = &cx->streams[i];
 517
 518                 if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 519                         continue;
 520                 if (test_bit(CX18_F_S_STREAMING, &s->s_flags))
 521                         cx18_stop_v4l2_encode_stream(s, 0);
 522         }
 523 }
 524
 525 int cx18_stop_v4l2_encode_stream(struct cx18_stream *s, int gop_end)
 526 {
 527         struct cx18 *cx = s->cx;
 528         unsigned long then;
 529
 530         if (s->v4l2dev == NULL && s->dvb.enabled == 0)
 531                 return -EINVAL;
 532
 533         /* This function assumes that you are allowed to stop the capture
 534            and that we are actually capturing */
 535
 536         CX18_DEBUG_INFO("Stop Capture\n");
 537
 538         if (atomic_read(&cx->tot_capturing) == 0)
 539                 return 0;
 540
 541         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 542                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 2, s->handle, !gop_end);
 543         else
 544                 cx18_vapi(cx, CX18_CPU_CAPTURE_STOP, 1, s->handle);
 545
 546         then = jiffies;
 547
 548         if (s->type == CX18_ENC_STREAM_TYPE_MPG && gop_end) {
 549                 CX18_INFO("ignoring gop_end: not (yet?) supported by the firmware\n");
 550         }
 551
 552         /* Tell the CX23418 it can't use our buffers anymore */
 553         cx18_vapi(cx, CX18_CPU_DE_RELEASE_MDL, 1, s->handle);
 554
 555         if (s->type != CX18_ENC_STREAM_TYPE_TS)
 556                 atomic_dec(&cx->ana_capturing);
 557         atomic_dec(&cx->tot_capturing);
 558
 559         /* Clear capture and no-read bits */
 560         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 561
 562         cx18_vapi(cx, CX18_DESTROY_TASK, 1, s->handle);
 563         s->handle = CX18_INVALID_TASK_HANDLE;
 564
 565         if (atomic_read(&cx->tot_capturing) > 0)
 566                 return 0;
 567
 568         cx18_write_reg(cx, 5, CX18_DSP0_INTERRUPT_MASK);
 569         wake_up(&s->waitq);
 570
 571         return 0;
 572 }
 573
 574 u32 cx18_find_handle(struct cx18 *cx)
 575 {
 576         int i;
 577
 578         /* find first available handle to be used for global settings */
 579         for (i = 0; i < CX18_MAX_STREAMS; i++) {
 580                 struct cx18_stream *s = &cx->streams[i];
 581
 582                 if (s->v4l2dev && (s->handle != CX18_INVALID_TASK_HANDLE))
 583                         return s->handle;
 584         }
 585         return CX18_INVALID_TASK_HANDLE;
 586 }