Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6
[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 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 }