Merge branch 'topic/jack' into topic/docbook-fix
[linux-2.6] / 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 }