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[mirror_ubuntu-bionic-kernel.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
102 #define SNDRV_PCM_TRIGGER_STOP 0
103 #define SNDRV_PCM_TRIGGER_START 1
104 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
105 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
106 #define SNDRV_PCM_TRIGGER_SUSPEND 5
107 #define SNDRV_PCM_TRIGGER_RESUME 6
108
109 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
110
111 /* If you change this don't forget to change rates[] table in pcm_native.c */
112 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
113 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
114 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
115 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
116 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
117 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
118 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
119 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
120 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
121 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
122 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
123 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
124 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
125
126 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
127 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
128
129 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
130 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
131 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
132 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
133 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
134 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
135 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
136 SNDRV_PCM_RATE_192000)
137 #define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8)
138 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8)
139 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE)
140 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE)
141 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE)
142 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE)
143 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE)
144 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE)
145 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE)
146 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE)
147 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE)
148 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE)
149 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE)
150 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE)
151 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
152 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
153 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
154 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
155 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
157 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
158 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW)
159 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
160 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG)
161 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM)
162 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
163 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
164 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
165 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
166 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
167 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
168 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
169 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
170 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
171 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
172 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
173 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
174 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
175
176 #ifdef SNDRV_LITTLE_ENDIAN
177 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
178 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
179 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
180 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
181 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
182 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
183 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
184 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
185 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
186 #endif
187 #ifdef SNDRV_BIG_ENDIAN
188 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
189 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
190 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
191 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
192 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
193 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
194 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
195 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
196 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
197 #endif
198
199 struct snd_pcm_file {
200 struct snd_pcm_substream *substream;
201 int no_compat_mmap;
202 };
203
204 struct snd_pcm_hw_rule;
205 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
206 struct snd_pcm_hw_rule *rule);
207
208 struct snd_pcm_hw_rule {
209 unsigned int cond;
210 snd_pcm_hw_rule_func_t func;
211 int var;
212 int deps[4];
213 void *private;
214 };
215
216 struct snd_pcm_hw_constraints {
217 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
218 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
219 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
220 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
221 unsigned int rules_num;
222 unsigned int rules_all;
223 struct snd_pcm_hw_rule *rules;
224 };
225
226 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
227 snd_pcm_hw_param_t var)
228 {
229 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
230 }
231
232 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
233 snd_pcm_hw_param_t var)
234 {
235 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
236 }
237
238 struct snd_ratnum {
239 unsigned int num;
240 unsigned int den_min, den_max, den_step;
241 };
242
243 struct snd_ratden {
244 unsigned int num_min, num_max, num_step;
245 unsigned int den;
246 };
247
248 struct snd_pcm_hw_constraint_ratnums {
249 int nrats;
250 struct snd_ratnum *rats;
251 };
252
253 struct snd_pcm_hw_constraint_ratdens {
254 int nrats;
255 struct snd_ratden *rats;
256 };
257
258 struct snd_pcm_hw_constraint_list {
259 unsigned int count;
260 unsigned int *list;
261 unsigned int mask;
262 };
263
264 struct snd_pcm_runtime {
265 /* -- Status -- */
266 struct snd_pcm_substream *trigger_master;
267 struct timespec trigger_tstamp; /* trigger timestamp */
268 int overrange;
269 snd_pcm_uframes_t avail_max;
270 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
271 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
272
273 /* -- HW params -- */
274 snd_pcm_access_t access; /* access mode */
275 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
276 snd_pcm_subformat_t subformat; /* subformat */
277 unsigned int rate; /* rate in Hz */
278 unsigned int channels; /* channels */
279 snd_pcm_uframes_t period_size; /* period size */
280 unsigned int periods; /* periods */
281 snd_pcm_uframes_t buffer_size; /* buffer size */
282 snd_pcm_uframes_t min_align; /* Min alignment for the format */
283 size_t byte_align;
284 unsigned int frame_bits;
285 unsigned int sample_bits;
286 unsigned int info;
287 unsigned int rate_num;
288 unsigned int rate_den;
289
290 /* -- SW params -- */
291 int tstamp_mode; /* mmap timestamp is updated */
292 unsigned int period_step;
293 snd_pcm_uframes_t start_threshold;
294 snd_pcm_uframes_t stop_threshold;
295 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
296 noise is nearest than this */
297 snd_pcm_uframes_t silence_size; /* Silence filling size */
298 snd_pcm_uframes_t boundary; /* pointers wrap point */
299
300 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
301 snd_pcm_uframes_t silence_filled; /* size filled with silence */
302
303 union snd_pcm_sync_id sync; /* hardware synchronization ID */
304
305 /* -- mmap -- */
306 struct snd_pcm_mmap_status *status;
307 struct snd_pcm_mmap_control *control;
308
309 /* -- locking / scheduling -- */
310 wait_queue_head_t sleep;
311 struct fasync_struct *fasync;
312
313 /* -- private section -- */
314 void *private_data;
315 void (*private_free)(struct snd_pcm_runtime *runtime);
316
317 /* -- hardware description -- */
318 struct snd_pcm_hardware hw;
319 struct snd_pcm_hw_constraints hw_constraints;
320
321 /* -- interrupt callbacks -- */
322 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
323 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
324
325 /* -- timer -- */
326 unsigned int timer_resolution; /* timer resolution */
327 int tstamp_type; /* timestamp type */
328
329 /* -- DMA -- */
330 unsigned char *dma_area; /* DMA area */
331 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
332 size_t dma_bytes; /* size of DMA area */
333
334 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
335
336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
337 /* -- OSS things -- */
338 struct snd_pcm_oss_runtime oss;
339 #endif
340 };
341
342 struct snd_pcm_group { /* keep linked substreams */
343 spinlock_t lock;
344 struct list_head substreams;
345 int count;
346 };
347
348 struct snd_pcm_substream {
349 struct snd_pcm *pcm;
350 struct snd_pcm_str *pstr;
351 void *private_data; /* copied from pcm->private_data */
352 int number;
353 char name[32]; /* substream name */
354 int stream; /* stream (direction) */
355 char latency_id[20]; /* latency identifier */
356 size_t buffer_bytes_max; /* limit ring buffer size */
357 struct snd_dma_buffer dma_buffer;
358 unsigned int dma_buf_id;
359 size_t dma_max;
360 /* -- hardware operations -- */
361 struct snd_pcm_ops *ops;
362 /* -- runtime information -- */
363 struct snd_pcm_runtime *runtime;
364 /* -- timer section -- */
365 struct snd_timer *timer; /* timer */
366 unsigned timer_running: 1; /* time is running */
367 /* -- next substream -- */
368 struct snd_pcm_substream *next;
369 /* -- linked substreams -- */
370 struct list_head link_list; /* linked list member */
371 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
372 struct snd_pcm_group *group; /* pointer to current group */
373 /* -- assigned files -- */
374 void *file;
375 int ref_count;
376 atomic_t mmap_count;
377 unsigned int f_flags;
378 void (*pcm_release)(struct snd_pcm_substream *);
379 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
380 /* -- OSS things -- */
381 struct snd_pcm_oss_substream oss;
382 #endif
383 #ifdef CONFIG_SND_VERBOSE_PROCFS
384 struct snd_info_entry *proc_root;
385 struct snd_info_entry *proc_info_entry;
386 struct snd_info_entry *proc_hw_params_entry;
387 struct snd_info_entry *proc_sw_params_entry;
388 struct snd_info_entry *proc_status_entry;
389 struct snd_info_entry *proc_prealloc_entry;
390 struct snd_info_entry *proc_prealloc_max_entry;
391 #endif
392 /* misc flags */
393 unsigned int hw_opened: 1;
394 };
395
396 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
397
398
399 struct snd_pcm_str {
400 int stream; /* stream (direction) */
401 struct snd_pcm *pcm;
402 /* -- substreams -- */
403 unsigned int substream_count;
404 unsigned int substream_opened;
405 struct snd_pcm_substream *substream;
406 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
407 /* -- OSS things -- */
408 struct snd_pcm_oss_stream oss;
409 #endif
410 #ifdef CONFIG_SND_VERBOSE_PROCFS
411 struct snd_info_entry *proc_root;
412 struct snd_info_entry *proc_info_entry;
413 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
414 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
415 struct snd_info_entry *proc_xrun_debug_entry;
416 #endif
417 #endif
418 };
419
420 struct snd_pcm {
421 struct snd_card *card;
422 struct list_head list;
423 int device; /* device number */
424 unsigned int info_flags;
425 unsigned short dev_class;
426 unsigned short dev_subclass;
427 char id[64];
428 char name[80];
429 struct snd_pcm_str streams[2];
430 struct mutex open_mutex;
431 wait_queue_head_t open_wait;
432 void *private_data;
433 void (*private_free) (struct snd_pcm *pcm);
434 struct device *dev; /* actual hw device this belongs to */
435 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
436 struct snd_pcm_oss oss;
437 #endif
438 };
439
440 struct snd_pcm_notify {
441 int (*n_register) (struct snd_pcm * pcm);
442 int (*n_disconnect) (struct snd_pcm * pcm);
443 int (*n_unregister) (struct snd_pcm * pcm);
444 struct list_head list;
445 };
446
447 /*
448 * Registering
449 */
450
451 extern const struct file_operations snd_pcm_f_ops[2];
452
453 int snd_pcm_new(struct snd_card *card, const char *id, int device,
454 int playback_count, int capture_count,
455 struct snd_pcm **rpcm);
456 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
457
458 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
459
460 /*
461 * Native I/O
462 */
463
464 extern rwlock_t snd_pcm_link_rwlock;
465
466 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
467 int snd_pcm_info_user(struct snd_pcm_substream *substream,
468 struct snd_pcm_info __user *info);
469 int snd_pcm_status(struct snd_pcm_substream *substream,
470 struct snd_pcm_status *status);
471 int snd_pcm_start(struct snd_pcm_substream *substream);
472 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
473 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
474 #ifdef CONFIG_PM
475 int snd_pcm_suspend(struct snd_pcm_substream *substream);
476 int snd_pcm_suspend_all(struct snd_pcm *pcm);
477 #endif
478 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
479 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
480 struct snd_pcm_substream **rsubstream);
481 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
482 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
483 struct snd_pcm_substream **rsubstream);
484 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
485 void snd_pcm_vma_notify_data(void *client, void *data);
486 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
487
488 #if BITS_PER_LONG >= 64
489
490 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
491 {
492 *rem = *n % div;
493 *n /= div;
494 }
495
496 #elif defined(i386)
497
498 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
499 {
500 u_int32_t low, high;
501 low = *n & 0xffffffff;
502 high = *n >> 32;
503 if (high) {
504 u_int32_t high1 = high % div;
505 high /= div;
506 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
507 *n = (u_int64_t)high << 32 | low;
508 } else {
509 *n = low / div;
510 *rem = low % div;
511 }
512 }
513 #else
514
515 static inline void divl(u_int32_t high, u_int32_t low,
516 u_int32_t div,
517 u_int32_t *q, u_int32_t *r)
518 {
519 u_int64_t n = (u_int64_t)high << 32 | low;
520 u_int64_t d = (u_int64_t)div << 31;
521 u_int32_t q1 = 0;
522 int c = 32;
523 while (n > 0xffffffffU) {
524 q1 <<= 1;
525 if (n >= d) {
526 n -= d;
527 q1 |= 1;
528 }
529 d >>= 1;
530 c--;
531 }
532 q1 <<= c;
533 if (n) {
534 low = n;
535 *q = q1 | (low / div);
536 *r = low % div;
537 } else {
538 *r = 0;
539 *q = q1;
540 }
541 return;
542 }
543
544 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
545 {
546 u_int32_t low, high;
547 low = *n & 0xffffffff;
548 high = *n >> 32;
549 if (high) {
550 u_int32_t high1 = high % div;
551 u_int32_t low1 = low;
552 high /= div;
553 divl(high1, low1, div, &low, rem);
554 *n = (u_int64_t)high << 32 | low;
555 } else {
556 *n = low / div;
557 *rem = low % div;
558 }
559 }
560 #endif
561
562 /*
563 * PCM library
564 */
565
566 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
567 {
568 return substream->group != &substream->self_group;
569 }
570
571 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
572 {
573 read_lock(&snd_pcm_link_rwlock);
574 spin_lock(&substream->self_group.lock);
575 }
576
577 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
578 {
579 spin_unlock(&substream->self_group.lock);
580 read_unlock(&snd_pcm_link_rwlock);
581 }
582
583 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
584 {
585 read_lock_irq(&snd_pcm_link_rwlock);
586 spin_lock(&substream->self_group.lock);
587 }
588
589 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
590 {
591 spin_unlock(&substream->self_group.lock);
592 read_unlock_irq(&snd_pcm_link_rwlock);
593 }
594
595 #define snd_pcm_stream_lock_irqsave(substream, flags) \
596 do { \
597 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
598 spin_lock(&substream->self_group.lock); \
599 } while (0)
600
601 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
602 do { \
603 spin_unlock(&substream->self_group.lock); \
604 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
605 } while (0)
606
607 #define snd_pcm_group_for_each_entry(s, substream) \
608 list_for_each_entry(s, &substream->group->substreams, link_list)
609
610 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
611 {
612 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
613 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
614 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
615 }
616
617 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
618 {
619 return size * 8 / runtime->sample_bits;
620 }
621
622 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
623 {
624 return size * 8 / runtime->frame_bits;
625 }
626
627 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
628 {
629 return size * runtime->sample_bits / 8;
630 }
631
632 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
633 {
634 return size * runtime->frame_bits / 8;
635 }
636
637 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
638 {
639 return bytes % runtime->byte_align == 0;
640 }
641
642 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
643 {
644 struct snd_pcm_runtime *runtime = substream->runtime;
645 return frames_to_bytes(runtime, runtime->buffer_size);
646 }
647
648 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
649 {
650 struct snd_pcm_runtime *runtime = substream->runtime;
651 return frames_to_bytes(runtime, runtime->period_size);
652 }
653
654 /*
655 * result is: 0 ... (boundary - 1)
656 */
657 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
658 {
659 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
660 if (avail < 0)
661 avail += runtime->boundary;
662 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
663 avail -= runtime->boundary;
664 return avail;
665 }
666
667 /*
668 * result is: 0 ... (boundary - 1)
669 */
670 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
671 {
672 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
673 if (avail < 0)
674 avail += runtime->boundary;
675 return avail;
676 }
677
678 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
679 {
680 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
681 }
682
683 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
684 {
685 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
686 }
687
688 /**
689 * snd_pcm_playback_ready - check whether the playback buffer is available
690 * @substream: the pcm substream instance
691 *
692 * Checks whether enough free space is available on the playback buffer.
693 *
694 * Returns non-zero if available, or zero if not.
695 */
696 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
697 {
698 struct snd_pcm_runtime *runtime = substream->runtime;
699 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
700 }
701
702 /**
703 * snd_pcm_capture_ready - check whether the capture buffer is available
704 * @substream: the pcm substream instance
705 *
706 * Checks whether enough capture data is available on the capture buffer.
707 *
708 * Returns non-zero if available, or zero if not.
709 */
710 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
711 {
712 struct snd_pcm_runtime *runtime = substream->runtime;
713 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
714 }
715
716 /**
717 * snd_pcm_playback_data - check whether any data exists on the playback buffer
718 * @substream: the pcm substream instance
719 *
720 * Checks whether any data exists on the playback buffer. If stop_threshold
721 * is bigger or equal to boundary, then this function returns always non-zero.
722 *
723 * Returns non-zero if exists, or zero if not.
724 */
725 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
726 {
727 struct snd_pcm_runtime *runtime = substream->runtime;
728
729 if (runtime->stop_threshold >= runtime->boundary)
730 return 1;
731 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
732 }
733
734 /**
735 * snd_pcm_playback_empty - check whether the playback buffer is empty
736 * @substream: the pcm substream instance
737 *
738 * Checks whether the playback buffer is empty.
739 *
740 * Returns non-zero if empty, or zero if not.
741 */
742 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
743 {
744 struct snd_pcm_runtime *runtime = substream->runtime;
745 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
746 }
747
748 /**
749 * snd_pcm_capture_empty - check whether the capture buffer is empty
750 * @substream: the pcm substream instance
751 *
752 * Checks whether the capture buffer is empty.
753 *
754 * Returns non-zero if empty, or zero if not.
755 */
756 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
757 {
758 struct snd_pcm_runtime *runtime = substream->runtime;
759 return snd_pcm_capture_avail(runtime) == 0;
760 }
761
762 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
763 struct snd_pcm_substream *master)
764 {
765 substream->runtime->trigger_master = master;
766 }
767
768 static inline int hw_is_mask(int var)
769 {
770 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
771 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
772 }
773
774 static inline int hw_is_interval(int var)
775 {
776 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
777 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
778 }
779
780 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
781 snd_pcm_hw_param_t var)
782 {
783 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
784 }
785
786 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
787 snd_pcm_hw_param_t var)
788 {
789 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
790 }
791
792 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
793 snd_pcm_hw_param_t var)
794 {
795 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
796 }
797
798 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
799 snd_pcm_hw_param_t var)
800 {
801 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
802 }
803
804 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
805 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
806 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
807 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
808 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
809 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
810 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
811 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
812 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
813 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
814
815
816 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
817 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
818 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
819 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
820 unsigned int k, struct snd_interval *c);
821 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
822 const struct snd_interval *b, struct snd_interval *c);
823 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
824 int snd_interval_ratnum(struct snd_interval *i,
825 unsigned int rats_count, struct snd_ratnum *rats,
826 unsigned int *nump, unsigned int *denp);
827
828 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
829 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
830 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
831
832 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
833
834 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
835 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
836
837 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
838 u_int32_t mask);
839 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
840 u_int64_t mask);
841 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
842 unsigned int min, unsigned int max);
843 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
844 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
845 unsigned int cond,
846 snd_pcm_hw_param_t var,
847 struct snd_pcm_hw_constraint_list *l);
848 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
849 unsigned int cond,
850 snd_pcm_hw_param_t var,
851 struct snd_pcm_hw_constraint_ratnums *r);
852 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
853 unsigned int cond,
854 snd_pcm_hw_param_t var,
855 struct snd_pcm_hw_constraint_ratdens *r);
856 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
857 unsigned int cond,
858 unsigned int width,
859 unsigned int msbits);
860 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
861 unsigned int cond,
862 snd_pcm_hw_param_t var,
863 unsigned long step);
864 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
865 unsigned int cond,
866 snd_pcm_hw_param_t var);
867 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
868 unsigned int cond,
869 int var,
870 snd_pcm_hw_rule_func_t func, void *private,
871 int dep, ...);
872
873 int snd_pcm_format_signed(snd_pcm_format_t format);
874 int snd_pcm_format_unsigned(snd_pcm_format_t format);
875 int snd_pcm_format_linear(snd_pcm_format_t format);
876 int snd_pcm_format_little_endian(snd_pcm_format_t format);
877 int snd_pcm_format_big_endian(snd_pcm_format_t format);
878 #if 0 /* just for DocBook */
879 /**
880 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
881 * @format: the format to check
882 *
883 * Returns 1 if the given PCM format is CPU-endian, 0 if
884 * opposite, or a negative error code if endian not specified.
885 */
886 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
887 #endif /* DocBook */
888 #ifdef SNDRV_LITTLE_ENDIAN
889 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
890 #else
891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
892 #endif
893 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
894 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
895 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
896 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
897 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
898 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
899
900 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
901 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
902 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
903 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
904 unsigned int cmd, void *arg);
905 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
906 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
907 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
908 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
909 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
910 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
911 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
912 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
913 const void __user *buf,
914 snd_pcm_uframes_t frames);
915 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
916 void __user *buf, snd_pcm_uframes_t frames);
917 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
918 void __user **bufs, snd_pcm_uframes_t frames);
919 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
920 void __user **bufs, snd_pcm_uframes_t frames);
921
922 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
923
924 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
925 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
926
927 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
928 struct snd_dma_buffer *bufp)
929 {
930 struct snd_pcm_runtime *runtime = substream->runtime;
931 if (bufp) {
932 runtime->dma_buffer_p = bufp;
933 runtime->dma_area = bufp->area;
934 runtime->dma_addr = bufp->addr;
935 runtime->dma_bytes = bufp->bytes;
936 } else {
937 runtime->dma_buffer_p = NULL;
938 runtime->dma_area = NULL;
939 runtime->dma_addr = 0;
940 runtime->dma_bytes = 0;
941 }
942 }
943
944 /*
945 * Timer interface
946 */
947
948 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
949 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
950 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
951
952 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
953 struct timespec *tv)
954 {
955 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
956 do_posix_clock_monotonic_gettime(tv);
957 else
958 getnstimeofday(tv);
959 }
960
961 /*
962 * Memory
963 */
964
965 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
966 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
967 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
968 int type, struct device *data,
969 size_t size, size_t max);
970 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
971 int type, void *data,
972 size_t size, size_t max);
973 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
974 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
975
976 /*
977 * SG-buffer handling
978 */
979 #define snd_pcm_substream_sgbuf(substream) \
980 ((substream)->runtime->dma_buffer_p->private_data)
981
982 static inline dma_addr_t
983 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
984 {
985 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
986 return snd_sgbuf_get_addr(sg, ofs);
987 }
988
989 static inline void *
990 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
991 {
992 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
993 return snd_sgbuf_get_ptr(sg, ofs);
994 }
995
996 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
997 unsigned long offset);
998 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
999 unsigned int ofs, unsigned int size);
1000
1001 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1002 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1003 {
1004 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1005 atomic_inc(&substream->mmap_count);
1006 }
1007
1008 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1009 {
1010 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1011 atomic_dec(&substream->mmap_count);
1012 }
1013
1014 /* mmap for io-memory area */
1015 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1016 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1017 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1018 #else
1019 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1020 #define snd_pcm_lib_mmap_iomem NULL
1021 #endif
1022
1023 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1024 {
1025 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1026 }
1027
1028 /*
1029 * Misc
1030 */
1031
1032 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1033 (IEC958_AES1_CON_ORIGINAL<<8)|\
1034 (IEC958_AES1_CON_PCM_CODER<<8)|\
1035 (IEC958_AES3_CON_FS_48000<<24))
1036
1037 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1038
1039 #endif /* __SOUND_PCM_H */
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