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13bc83ca35fb1230c53550b82c388ca0aa5f7720
[deliverable/linux.git] / include / sound / pcm.h
1 #ifndef __SOUND_PCM_H
2 #define __SOUND_PCM_H
3
4 /*
5 * Digital Audio (PCM) abstract layer
6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7 * Abramo Bagnara <abramo@alsa-project.org>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 #include <sound/asound.h>
27 #include <sound/memalloc.h>
28 #include <sound/minors.h>
29 #include <linux/poll.h>
30 #include <linux/mm.h>
31 #include <linux/bitops.h>
32
33 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
34 #define snd_pcm_chip(pcm) ((pcm)->private_data)
35
36 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
37 #include "pcm_oss.h"
38 #endif
39
40 /*
41 * Hardware (lowlevel) section
42 */
43
44 struct snd_pcm_hardware {
45 unsigned int info; /* SNDRV_PCM_INFO_* */
46 u64 formats; /* SNDRV_PCM_FMTBIT_* */
47 unsigned int rates; /* SNDRV_PCM_RATE_* */
48 unsigned int rate_min; /* min rate */
49 unsigned int rate_max; /* max rate */
50 unsigned int channels_min; /* min channels */
51 unsigned int channels_max; /* max channels */
52 size_t buffer_bytes_max; /* max buffer size */
53 size_t period_bytes_min; /* min period size */
54 size_t period_bytes_max; /* max period size */
55 unsigned int periods_min; /* min # of periods */
56 unsigned int periods_max; /* max # of periods */
57 size_t fifo_size; /* fifo size in bytes */
58 };
59
60 struct snd_pcm_substream;
61
62 struct snd_pcm_ops {
63 int (*open)(struct snd_pcm_substream *substream);
64 int (*close)(struct snd_pcm_substream *substream);
65 int (*ioctl)(struct snd_pcm_substream * substream,
66 unsigned int cmd, void *arg);
67 int (*hw_params)(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params *params);
69 int (*hw_free)(struct snd_pcm_substream *substream);
70 int (*prepare)(struct snd_pcm_substream *substream);
71 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
72 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
73 int (*copy)(struct snd_pcm_substream *substream, int channel,
74 snd_pcm_uframes_t pos,
75 void __user *buf, snd_pcm_uframes_t count);
76 int (*silence)(struct snd_pcm_substream *substream, int channel,
77 snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
78 struct page *(*page)(struct snd_pcm_substream *substream,
79 unsigned long offset);
80 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
81 int (*ack)(struct snd_pcm_substream *substream);
82 };
83
84 /*
85 *
86 */
87
88 #if defined(CONFIG_SND_DYNAMIC_MINORS)
89 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
90 #else
91 #define SNDRV_PCM_DEVICES 8
92 #endif
93
94 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0)
95 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1)
96
97 #define SNDRV_PCM_IOCTL1_RESET 0
98 #define SNDRV_PCM_IOCTL1_INFO 1
99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
100 #define SNDRV_PCM_IOCTL1_GSTATE 3
101 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
102
103 #define SNDRV_PCM_TRIGGER_STOP 0
104 #define SNDRV_PCM_TRIGGER_START 1
105 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
106 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
107 #define SNDRV_PCM_TRIGGER_SUSPEND 5
108 #define SNDRV_PCM_TRIGGER_RESUME 6
109
110 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
111
112 /* If you change this don't forget to change rates[] table in pcm_native.c */
113 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
114 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
115 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
116 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
117 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
118 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
119 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
120 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
121 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
122 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
123 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
124 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
125 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
126
127 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
128 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
129
130 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
131 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
132 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
133 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
134 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
135 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
136 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
137 SNDRV_PCM_RATE_192000)
138 #define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8)
139 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8)
140 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE)
141 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE)
142 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE)
143 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE)
144 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE)
145 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE)
146 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE)
147 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE)
148 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE)
149 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE)
150 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE)
151 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE)
152 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
153 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
154 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
155 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
157 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
158 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
159 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW)
160 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
161 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG)
162 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM)
163 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
164 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
165 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
166 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
167 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
168 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
169 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
170 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
171 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
172 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
173 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
174 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
175 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
176
177 #ifdef SNDRV_LITTLE_ENDIAN
178 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
179 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
180 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
181 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
182 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
183 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
184 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
185 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
186 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
187 #endif
188 #ifdef SNDRV_BIG_ENDIAN
189 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
190 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
191 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
192 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
193 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
194 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
195 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
196 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
198 #endif
199
200 struct snd_pcm_file {
201 struct snd_pcm_substream *substream;
202 int no_compat_mmap;
203 };
204
205 struct snd_pcm_hw_rule;
206 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
207 struct snd_pcm_hw_rule *rule);
208
209 struct snd_pcm_hw_rule {
210 unsigned int cond;
211 snd_pcm_hw_rule_func_t func;
212 int var;
213 int deps[4];
214 void *private;
215 };
216
217 struct snd_pcm_hw_constraints {
218 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
219 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
220 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
221 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
222 unsigned int rules_num;
223 unsigned int rules_all;
224 struct snd_pcm_hw_rule *rules;
225 };
226
227 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
228 snd_pcm_hw_param_t var)
229 {
230 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
231 }
232
233 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
234 snd_pcm_hw_param_t var)
235 {
236 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
237 }
238
239 struct snd_ratnum {
240 unsigned int num;
241 unsigned int den_min, den_max, den_step;
242 };
243
244 struct snd_ratden {
245 unsigned int num_min, num_max, num_step;
246 unsigned int den;
247 };
248
249 struct snd_pcm_hw_constraint_ratnums {
250 int nrats;
251 struct snd_ratnum *rats;
252 };
253
254 struct snd_pcm_hw_constraint_ratdens {
255 int nrats;
256 struct snd_ratden *rats;
257 };
258
259 struct snd_pcm_hw_constraint_list {
260 unsigned int count;
261 unsigned int *list;
262 unsigned int mask;
263 };
264
265 struct snd_pcm_hwptr_log;
266
267 struct snd_pcm_runtime {
268 /* -- Status -- */
269 struct snd_pcm_substream *trigger_master;
270 struct timespec trigger_tstamp; /* trigger timestamp */
271 int overrange;
272 snd_pcm_uframes_t avail_max;
273 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
274 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
275 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
276 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
277
278 /* -- HW params -- */
279 snd_pcm_access_t access; /* access mode */
280 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
281 snd_pcm_subformat_t subformat; /* subformat */
282 unsigned int rate; /* rate in Hz */
283 unsigned int channels; /* channels */
284 snd_pcm_uframes_t period_size; /* period size */
285 unsigned int periods; /* periods */
286 snd_pcm_uframes_t buffer_size; /* buffer size */
287 snd_pcm_uframes_t min_align; /* Min alignment for the format */
288 size_t byte_align;
289 unsigned int frame_bits;
290 unsigned int sample_bits;
291 unsigned int info;
292 unsigned int rate_num;
293 unsigned int rate_den;
294
295 /* -- SW params -- */
296 int tstamp_mode; /* mmap timestamp is updated */
297 unsigned int period_step;
298 snd_pcm_uframes_t start_threshold;
299 snd_pcm_uframes_t stop_threshold;
300 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
301 noise is nearest than this */
302 snd_pcm_uframes_t silence_size; /* Silence filling size */
303 snd_pcm_uframes_t boundary; /* pointers wrap point */
304
305 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
306 snd_pcm_uframes_t silence_filled; /* size filled with silence */
307
308 union snd_pcm_sync_id sync; /* hardware synchronization ID */
309
310 /* -- mmap -- */
311 struct snd_pcm_mmap_status *status;
312 struct snd_pcm_mmap_control *control;
313
314 /* -- locking / scheduling -- */
315 unsigned int twake: 1; /* do transfer (!poll) wakeup */
316 wait_queue_head_t sleep; /* poll sleep */
317 wait_queue_head_t tsleep; /* transfer sleep */
318 struct fasync_struct *fasync;
319
320 /* -- private section -- */
321 void *private_data;
322 void (*private_free)(struct snd_pcm_runtime *runtime);
323
324 /* -- hardware description -- */
325 struct snd_pcm_hardware hw;
326 struct snd_pcm_hw_constraints hw_constraints;
327
328 /* -- interrupt callbacks -- */
329 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
330 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
331
332 /* -- timer -- */
333 unsigned int timer_resolution; /* timer resolution */
334 int tstamp_type; /* timestamp type */
335
336 /* -- DMA -- */
337 unsigned char *dma_area; /* DMA area */
338 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
339 size_t dma_bytes; /* size of DMA area */
340
341 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
342
343 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
344 /* -- OSS things -- */
345 struct snd_pcm_oss_runtime oss;
346 #endif
347
348 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
349 struct snd_pcm_hwptr_log *hwptr_log;
350 #endif
351 };
352
353 struct snd_pcm_group { /* keep linked substreams */
354 spinlock_t lock;
355 struct list_head substreams;
356 int count;
357 };
358
359 struct pid;
360
361 struct snd_pcm_substream {
362 struct snd_pcm *pcm;
363 struct snd_pcm_str *pstr;
364 void *private_data; /* copied from pcm->private_data */
365 int number;
366 char name[32]; /* substream name */
367 int stream; /* stream (direction) */
368 char latency_id[20]; /* latency identifier */
369 size_t buffer_bytes_max; /* limit ring buffer size */
370 struct snd_dma_buffer dma_buffer;
371 unsigned int dma_buf_id;
372 size_t dma_max;
373 /* -- hardware operations -- */
374 struct snd_pcm_ops *ops;
375 /* -- runtime information -- */
376 struct snd_pcm_runtime *runtime;
377 /* -- timer section -- */
378 struct snd_timer *timer; /* timer */
379 unsigned timer_running: 1; /* time is running */
380 /* -- next substream -- */
381 struct snd_pcm_substream *next;
382 /* -- linked substreams -- */
383 struct list_head link_list; /* linked list member */
384 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
385 struct snd_pcm_group *group; /* pointer to current group */
386 /* -- assigned files -- */
387 void *file;
388 int ref_count;
389 atomic_t mmap_count;
390 unsigned int f_flags;
391 void (*pcm_release)(struct snd_pcm_substream *);
392 struct pid *pid;
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 /* -- OSS things -- */
395 struct snd_pcm_oss_substream oss;
396 #endif
397 #ifdef CONFIG_SND_VERBOSE_PROCFS
398 struct snd_info_entry *proc_root;
399 struct snd_info_entry *proc_info_entry;
400 struct snd_info_entry *proc_hw_params_entry;
401 struct snd_info_entry *proc_sw_params_entry;
402 struct snd_info_entry *proc_status_entry;
403 struct snd_info_entry *proc_prealloc_entry;
404 struct snd_info_entry *proc_prealloc_max_entry;
405 #endif
406 /* misc flags */
407 unsigned int hw_opened: 1;
408 };
409
410 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
411
412
413 struct snd_pcm_str {
414 int stream; /* stream (direction) */
415 struct snd_pcm *pcm;
416 /* -- substreams -- */
417 unsigned int substream_count;
418 unsigned int substream_opened;
419 struct snd_pcm_substream *substream;
420 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
421 /* -- OSS things -- */
422 struct snd_pcm_oss_stream oss;
423 #endif
424 #ifdef CONFIG_SND_VERBOSE_PROCFS
425 struct snd_info_entry *proc_root;
426 struct snd_info_entry *proc_info_entry;
427 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
428 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
429 struct snd_info_entry *proc_xrun_debug_entry;
430 #endif
431 #endif
432 };
433
434 struct snd_pcm {
435 struct snd_card *card;
436 struct list_head list;
437 int device; /* device number */
438 unsigned int info_flags;
439 unsigned short dev_class;
440 unsigned short dev_subclass;
441 char id[64];
442 char name[80];
443 struct snd_pcm_str streams[2];
444 struct mutex open_mutex;
445 wait_queue_head_t open_wait;
446 void *private_data;
447 void (*private_free) (struct snd_pcm *pcm);
448 struct device *dev; /* actual hw device this belongs to */
449 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
450 struct snd_pcm_oss oss;
451 #endif
452 };
453
454 struct snd_pcm_notify {
455 int (*n_register) (struct snd_pcm * pcm);
456 int (*n_disconnect) (struct snd_pcm * pcm);
457 int (*n_unregister) (struct snd_pcm * pcm);
458 struct list_head list;
459 };
460
461 /*
462 * Registering
463 */
464
465 extern const struct file_operations snd_pcm_f_ops[2];
466
467 int snd_pcm_new(struct snd_card *card, const char *id, int device,
468 int playback_count, int capture_count,
469 struct snd_pcm **rpcm);
470 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
471
472 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
473
474 /*
475 * Native I/O
476 */
477
478 extern rwlock_t snd_pcm_link_rwlock;
479
480 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
481 int snd_pcm_info_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_info __user *info);
483 int snd_pcm_status(struct snd_pcm_substream *substream,
484 struct snd_pcm_status *status);
485 int snd_pcm_start(struct snd_pcm_substream *substream);
486 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
487 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
488 #ifdef CONFIG_PM
489 int snd_pcm_suspend(struct snd_pcm_substream *substream);
490 int snd_pcm_suspend_all(struct snd_pcm *pcm);
491 #endif
492 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
493 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
494 struct snd_pcm_substream **rsubstream);
495 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
496 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
497 struct snd_pcm_substream **rsubstream);
498 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
499 void snd_pcm_vma_notify_data(void *client, void *data);
500 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
501
502 /*
503 * PCM library
504 */
505
506 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
507 {
508 return substream->group != &substream->self_group;
509 }
510
511 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
512 {
513 read_lock(&snd_pcm_link_rwlock);
514 spin_lock(&substream->self_group.lock);
515 }
516
517 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
518 {
519 spin_unlock(&substream->self_group.lock);
520 read_unlock(&snd_pcm_link_rwlock);
521 }
522
523 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
524 {
525 read_lock_irq(&snd_pcm_link_rwlock);
526 spin_lock(&substream->self_group.lock);
527 }
528
529 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
530 {
531 spin_unlock(&substream->self_group.lock);
532 read_unlock_irq(&snd_pcm_link_rwlock);
533 }
534
535 #define snd_pcm_stream_lock_irqsave(substream, flags) \
536 do { \
537 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
538 spin_lock(&substream->self_group.lock); \
539 } while (0)
540
541 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
542 do { \
543 spin_unlock(&substream->self_group.lock); \
544 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
545 } while (0)
546
547 #define snd_pcm_group_for_each_entry(s, substream) \
548 list_for_each_entry(s, &substream->group->substreams, link_list)
549
550 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
551 {
552 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
553 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
554 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
555 }
556
557 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
558 {
559 return size * 8 / runtime->sample_bits;
560 }
561
562 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
563 {
564 return size * 8 / runtime->frame_bits;
565 }
566
567 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
568 {
569 return size * runtime->sample_bits / 8;
570 }
571
572 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
573 {
574 return size * runtime->frame_bits / 8;
575 }
576
577 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
578 {
579 return bytes % runtime->byte_align == 0;
580 }
581
582 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
583 {
584 struct snd_pcm_runtime *runtime = substream->runtime;
585 return frames_to_bytes(runtime, runtime->buffer_size);
586 }
587
588 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
589 {
590 struct snd_pcm_runtime *runtime = substream->runtime;
591 return frames_to_bytes(runtime, runtime->period_size);
592 }
593
594 /*
595 * result is: 0 ... (boundary - 1)
596 */
597 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
598 {
599 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
600 if (avail < 0)
601 avail += runtime->boundary;
602 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
603 avail -= runtime->boundary;
604 return avail;
605 }
606
607 /*
608 * result is: 0 ... (boundary - 1)
609 */
610 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
611 {
612 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
613 if (avail < 0)
614 avail += runtime->boundary;
615 return avail;
616 }
617
618 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
619 {
620 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
621 }
622
623 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
624 {
625 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
626 }
627
628 /**
629 * snd_pcm_playback_ready - check whether the playback buffer is available
630 * @substream: the pcm substream instance
631 *
632 * Checks whether enough free space is available on the playback buffer.
633 *
634 * Returns non-zero if available, or zero if not.
635 */
636 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
637 {
638 struct snd_pcm_runtime *runtime = substream->runtime;
639 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
640 }
641
642 /**
643 * snd_pcm_capture_ready - check whether the capture buffer is available
644 * @substream: the pcm substream instance
645 *
646 * Checks whether enough capture data is available on the capture buffer.
647 *
648 * Returns non-zero if available, or zero if not.
649 */
650 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
651 {
652 struct snd_pcm_runtime *runtime = substream->runtime;
653 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
654 }
655
656 /**
657 * snd_pcm_playback_data - check whether any data exists on the playback buffer
658 * @substream: the pcm substream instance
659 *
660 * Checks whether any data exists on the playback buffer. If stop_threshold
661 * is bigger or equal to boundary, then this function returns always non-zero.
662 *
663 * Returns non-zero if exists, or zero if not.
664 */
665 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
666 {
667 struct snd_pcm_runtime *runtime = substream->runtime;
668
669 if (runtime->stop_threshold >= runtime->boundary)
670 return 1;
671 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
672 }
673
674 /**
675 * snd_pcm_playback_empty - check whether the playback buffer is empty
676 * @substream: the pcm substream instance
677 *
678 * Checks whether the playback buffer is empty.
679 *
680 * Returns non-zero if empty, or zero if not.
681 */
682 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
683 {
684 struct snd_pcm_runtime *runtime = substream->runtime;
685 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
686 }
687
688 /**
689 * snd_pcm_capture_empty - check whether the capture buffer is empty
690 * @substream: the pcm substream instance
691 *
692 * Checks whether the capture buffer is empty.
693 *
694 * Returns non-zero if empty, or zero if not.
695 */
696 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
697 {
698 struct snd_pcm_runtime *runtime = substream->runtime;
699 return snd_pcm_capture_avail(runtime) == 0;
700 }
701
702 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
703 struct snd_pcm_substream *master)
704 {
705 substream->runtime->trigger_master = master;
706 }
707
708 static inline int hw_is_mask(int var)
709 {
710 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
711 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
712 }
713
714 static inline int hw_is_interval(int var)
715 {
716 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
717 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
718 }
719
720 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
721 snd_pcm_hw_param_t var)
722 {
723 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
724 }
725
726 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
727 snd_pcm_hw_param_t var)
728 {
729 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
730 }
731
732 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
733 snd_pcm_hw_param_t var)
734 {
735 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
736 }
737
738 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
739 snd_pcm_hw_param_t var)
740 {
741 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
742 }
743
744 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
745 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
746 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
747 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
748 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
749 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
750 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
751 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
752 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
753 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
754
755
756 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
757 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
758 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
759 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
760 unsigned int k, struct snd_interval *c);
761 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
762 const struct snd_interval *b, struct snd_interval *c);
763 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
764 int snd_interval_ratnum(struct snd_interval *i,
765 unsigned int rats_count, struct snd_ratnum *rats,
766 unsigned int *nump, unsigned int *denp);
767
768 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
769 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
770 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
771
772 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
773
774 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
775 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
776
777 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
778 u_int32_t mask);
779 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
780 u_int64_t mask);
781 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
782 unsigned int min, unsigned int max);
783 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
784 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
785 unsigned int cond,
786 snd_pcm_hw_param_t var,
787 struct snd_pcm_hw_constraint_list *l);
788 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
789 unsigned int cond,
790 snd_pcm_hw_param_t var,
791 struct snd_pcm_hw_constraint_ratnums *r);
792 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
793 unsigned int cond,
794 snd_pcm_hw_param_t var,
795 struct snd_pcm_hw_constraint_ratdens *r);
796 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
797 unsigned int cond,
798 unsigned int width,
799 unsigned int msbits);
800 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
801 unsigned int cond,
802 snd_pcm_hw_param_t var,
803 unsigned long step);
804 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
805 unsigned int cond,
806 snd_pcm_hw_param_t var);
807 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
808 unsigned int cond,
809 int var,
810 snd_pcm_hw_rule_func_t func, void *private,
811 int dep, ...);
812
813 int snd_pcm_format_signed(snd_pcm_format_t format);
814 int snd_pcm_format_unsigned(snd_pcm_format_t format);
815 int snd_pcm_format_linear(snd_pcm_format_t format);
816 int snd_pcm_format_little_endian(snd_pcm_format_t format);
817 int snd_pcm_format_big_endian(snd_pcm_format_t format);
818 #if 0 /* just for DocBook */
819 /**
820 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
821 * @format: the format to check
822 *
823 * Returns 1 if the given PCM format is CPU-endian, 0 if
824 * opposite, or a negative error code if endian not specified.
825 */
826 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
827 #endif /* DocBook */
828 #ifdef SNDRV_LITTLE_ENDIAN
829 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
830 #else
831 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
832 #endif
833 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
834 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
835 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
836 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
837 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
838 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
839
840 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
841 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
842 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
843 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
844 unsigned int cmd, void *arg);
845 int snd_pcm_update_state(struct snd_pcm_substream *substream,
846 struct snd_pcm_runtime *runtime);
847 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
848 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
849 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
850 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
851 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
852 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
853 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
854 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
855 const void __user *buf,
856 snd_pcm_uframes_t frames);
857 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
858 void __user *buf, snd_pcm_uframes_t frames);
859 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
860 void __user **bufs, snd_pcm_uframes_t frames);
861 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
862 void __user **bufs, snd_pcm_uframes_t frames);
863
864 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
865
866 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
867 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
868
869 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
870 struct snd_dma_buffer *bufp)
871 {
872 struct snd_pcm_runtime *runtime = substream->runtime;
873 if (bufp) {
874 runtime->dma_buffer_p = bufp;
875 runtime->dma_area = bufp->area;
876 runtime->dma_addr = bufp->addr;
877 runtime->dma_bytes = bufp->bytes;
878 } else {
879 runtime->dma_buffer_p = NULL;
880 runtime->dma_area = NULL;
881 runtime->dma_addr = 0;
882 runtime->dma_bytes = 0;
883 }
884 }
885
886 /*
887 * Timer interface
888 */
889
890 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
891 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
892 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
893
894 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
895 struct timespec *tv)
896 {
897 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
898 do_posix_clock_monotonic_gettime(tv);
899 else
900 getnstimeofday(tv);
901 }
902
903 /*
904 * Memory
905 */
906
907 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
908 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
909 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
910 int type, struct device *data,
911 size_t size, size_t max);
912 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
913 int type, void *data,
914 size_t size, size_t max);
915 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
916 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
917
918 #ifdef CONFIG_SND_DMA_SGBUF
919 /*
920 * SG-buffer handling
921 */
922 #define snd_pcm_substream_sgbuf(substream) \
923 ((substream)->runtime->dma_buffer_p->private_data)
924
925 static inline dma_addr_t
926 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
927 {
928 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
929 return snd_sgbuf_get_addr(sg, ofs);
930 }
931
932 static inline void *
933 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
934 {
935 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
936 return snd_sgbuf_get_ptr(sg, ofs);
937 }
938
939 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
940 unsigned long offset);
941 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
942 unsigned int ofs, unsigned int size);
943
944 #else /* !SND_DMA_SGBUF */
945 /*
946 * fake using a continuous buffer
947 */
948 static inline dma_addr_t
949 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
950 {
951 return substream->runtime->dma_addr + ofs;
952 }
953
954 static inline void *
955 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
956 {
957 return substream->runtime->dma_area + ofs;
958 }
959
960 #define snd_pcm_sgbuf_ops_page NULL
961
962 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size)
963
964 #endif /* SND_DMA_SGBUF */
965
966 /* handle mmap counter - PCM mmap callback should handle this counter properly */
967 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
968 {
969 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
970 atomic_inc(&substream->mmap_count);
971 }
972
973 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
974 {
975 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
976 atomic_dec(&substream->mmap_count);
977 }
978
979 /* mmap for io-memory area */
980 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
981 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
982 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
983 #else
984 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
985 #define snd_pcm_lib_mmap_iomem NULL
986 #endif
987
988 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
989 {
990 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
991 }
992
993 /*
994 * Misc
995 */
996
997 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
998 (IEC958_AES1_CON_ORIGINAL<<8)|\
999 (IEC958_AES1_CON_PCM_CODER<<8)|\
1000 (IEC958_AES3_CON_FS_48000<<24))
1001
1002 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1003
1004 const char *snd_pcm_format_name(snd_pcm_format_t format);
1005
1006 #endif /* __SOUND_PCM_H */
Linux kernel - Deliverables
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