tjh.dev
Linux kernel mirror (for testing)
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linux
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
44struct 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
60struct snd_pcm_substream;
61
62struct 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
199struct snd_pcm_file {
200 struct snd_pcm_substream *substream;
201 int no_compat_mmap;
202};
203
204struct snd_pcm_hw_rule;
205typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
206 struct snd_pcm_hw_rule *rule);
207
208struct 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
216struct 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
226static 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
232static 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
238struct snd_ratnum {
239 unsigned int num;
240 unsigned int den_min, den_max, den_step;
241};
242
243struct snd_ratden {
244 unsigned int num_min, num_max, num_step;
245 unsigned int den;
246};
247
248struct snd_pcm_hw_constraint_ratnums {
249 int nrats;
250 struct snd_ratnum *rats;
251};
252
253struct snd_pcm_hw_constraint_ratdens {
254 int nrats;
255 struct snd_ratden *rats;
256};
257
258struct snd_pcm_hw_constraint_list {
259 unsigned int count;
260 unsigned int *list;
261 unsigned int mask;
262};
263
264struct 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
342struct snd_pcm_group { /* keep linked substreams */
343 spinlock_t lock;
344 struct list_head substreams;
345 int count;
346};
347
348struct 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 spinlock_t timer_lock;
368 /* -- next substream -- */
369 struct snd_pcm_substream *next;
370 /* -- linked substreams -- */
371 struct list_head link_list; /* linked list member */
372 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
373 struct snd_pcm_group *group; /* pointer to current group */
374 /* -- assigned files -- */
375 void *file;
376 int ref_count;
377 atomic_t mmap_count;
378 unsigned int f_flags;
379 void (*pcm_release)(struct snd_pcm_substream *);
380#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
381 /* -- OSS things -- */
382 struct snd_pcm_oss_substream oss;
383#endif
384#ifdef CONFIG_SND_VERBOSE_PROCFS
385 struct snd_info_entry *proc_root;
386 struct snd_info_entry *proc_info_entry;
387 struct snd_info_entry *proc_hw_params_entry;
388 struct snd_info_entry *proc_sw_params_entry;
389 struct snd_info_entry *proc_status_entry;
390 struct snd_info_entry *proc_prealloc_entry;
391 struct snd_info_entry *proc_prealloc_max_entry;
392#endif
393 /* misc flags */
394 unsigned int hw_opened: 1;
395};
396
397#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
398
399
400struct snd_pcm_str {
401 int stream; /* stream (direction) */
402 struct snd_pcm *pcm;
403 /* -- substreams -- */
404 unsigned int substream_count;
405 unsigned int substream_opened;
406 struct snd_pcm_substream *substream;
407#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
408 /* -- OSS things -- */
409 struct snd_pcm_oss_stream oss;
410#endif
411#ifdef CONFIG_SND_VERBOSE_PROCFS
412 struct snd_info_entry *proc_root;
413 struct snd_info_entry *proc_info_entry;
414#ifdef CONFIG_SND_PCM_XRUN_DEBUG
415 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
416 struct snd_info_entry *proc_xrun_debug_entry;
417#endif
418#endif
419};
420
421struct snd_pcm {
422 struct snd_card *card;
423 struct list_head list;
424 int device; /* device number */
425 unsigned int info_flags;
426 unsigned short dev_class;
427 unsigned short dev_subclass;
428 char id[64];
429 char name[80];
430 struct snd_pcm_str streams[2];
431 struct mutex open_mutex;
432 wait_queue_head_t open_wait;
433 void *private_data;
434 void (*private_free) (struct snd_pcm *pcm);
435 struct device *dev; /* actual hw device this belongs to */
436#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
437 struct snd_pcm_oss oss;
438#endif
439};
440
441struct snd_pcm_notify {
442 int (*n_register) (struct snd_pcm * pcm);
443 int (*n_disconnect) (struct snd_pcm * pcm);
444 int (*n_unregister) (struct snd_pcm * pcm);
445 struct list_head list;
446};
447
448/*
449 * Registering
450 */
451
452extern const struct file_operations snd_pcm_f_ops[2];
453
454int snd_pcm_new(struct snd_card *card, char *id, int device,
455 int playback_count, int capture_count,
456 struct snd_pcm **rpcm);
457int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
458
459int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
460
461/*
462 * Native I/O
463 */
464
465extern rwlock_t snd_pcm_link_rwlock;
466
467int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
468int snd_pcm_info_user(struct snd_pcm_substream *substream,
469 struct snd_pcm_info __user *info);
470int snd_pcm_status(struct snd_pcm_substream *substream,
471 struct snd_pcm_status *status);
472int snd_pcm_start(struct snd_pcm_substream *substream);
473int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
474int snd_pcm_drain_done(struct snd_pcm_substream *substream);
475#ifdef CONFIG_PM
476int snd_pcm_suspend(struct snd_pcm_substream *substream);
477int snd_pcm_suspend_all(struct snd_pcm *pcm);
478#endif
479int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
480int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
481 struct snd_pcm_substream **rsubstream);
482void snd_pcm_release_substream(struct snd_pcm_substream *substream);
483int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
484 struct snd_pcm_substream **rsubstream);
485void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
486void snd_pcm_vma_notify_data(void *client, void *data);
487int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
488
489#if BITS_PER_LONG >= 64
490
491static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
492{
493 *rem = *n % div;
494 *n /= div;
495}
496
497#elif defined(i386)
498
499static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
500{
501 u_int32_t low, high;
502 low = *n & 0xffffffff;
503 high = *n >> 32;
504 if (high) {
505 u_int32_t high1 = high % div;
506 high /= div;
507 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
508 *n = (u_int64_t)high << 32 | low;
509 } else {
510 *n = low / div;
511 *rem = low % div;
512 }
513}
514#else
515
516static inline void divl(u_int32_t high, u_int32_t low,
517 u_int32_t div,
518 u_int32_t *q, u_int32_t *r)
519{
520 u_int64_t n = (u_int64_t)high << 32 | low;
521 u_int64_t d = (u_int64_t)div << 31;
522 u_int32_t q1 = 0;
523 int c = 32;
524 while (n > 0xffffffffU) {
525 q1 <<= 1;
526 if (n >= d) {
527 n -= d;
528 q1 |= 1;
529 }
530 d >>= 1;
531 c--;
532 }
533 q1 <<= c;
534 if (n) {
535 low = n;
536 *q = q1 | (low / div);
537 *r = low % div;
538 } else {
539 *r = 0;
540 *q = q1;
541 }
542 return;
543}
544
545static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
546{
547 u_int32_t low, high;
548 low = *n & 0xffffffff;
549 high = *n >> 32;
550 if (high) {
551 u_int32_t high1 = high % div;
552 u_int32_t low1 = low;
553 high /= div;
554 divl(high1, low1, div, &low, rem);
555 *n = (u_int64_t)high << 32 | low;
556 } else {
557 *n = low / div;
558 *rem = low % div;
559 }
560}
561#endif
562
563/*
564 * PCM library
565 */
566
567static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
568{
569 return substream->group != &substream->self_group;
570}
571
572static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
573{
574 read_lock(&snd_pcm_link_rwlock);
575 spin_lock(&substream->self_group.lock);
576}
577
578static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
579{
580 spin_unlock(&substream->self_group.lock);
581 read_unlock(&snd_pcm_link_rwlock);
582}
583
584static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
585{
586 read_lock_irq(&snd_pcm_link_rwlock);
587 spin_lock(&substream->self_group.lock);
588}
589
590static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
591{
592 spin_unlock(&substream->self_group.lock);
593 read_unlock_irq(&snd_pcm_link_rwlock);
594}
595
596#define snd_pcm_stream_lock_irqsave(substream, flags) \
597do { \
598 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
599 spin_lock(&substream->self_group.lock); \
600} while (0)
601
602#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
603do { \
604 spin_unlock(&substream->self_group.lock); \
605 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
606} while (0)
607
608#define snd_pcm_group_for_each_entry(s, substream) \
609 list_for_each_entry(s, &substream->group->substreams, link_list)
610
611static inline int snd_pcm_running(struct snd_pcm_substream *substream)
612{
613 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
614 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
615 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
616}
617
618static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
619{
620 return size * 8 / runtime->sample_bits;
621}
622
623static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
624{
625 return size * 8 / runtime->frame_bits;
626}
627
628static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
629{
630 return size * runtime->sample_bits / 8;
631}
632
633static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
634{
635 return size * runtime->frame_bits / 8;
636}
637
638static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
639{
640 return bytes % runtime->byte_align == 0;
641}
642
643static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
644{
645 struct snd_pcm_runtime *runtime = substream->runtime;
646 return frames_to_bytes(runtime, runtime->buffer_size);
647}
648
649static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
650{
651 struct snd_pcm_runtime *runtime = substream->runtime;
652 return frames_to_bytes(runtime, runtime->period_size);
653}
654
655/*
656 * result is: 0 ... (boundary - 1)
657 */
658static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
659{
660 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
661 if (avail < 0)
662 avail += runtime->boundary;
663 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
664 avail -= runtime->boundary;
665 return avail;
666}
667
668/*
669 * result is: 0 ... (boundary - 1)
670 */
671static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
672{
673 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
674 if (avail < 0)
675 avail += runtime->boundary;
676 return avail;
677}
678
679static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
680{
681 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
682}
683
684static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
685{
686 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
687}
688
689/**
690 * snd_pcm_playback_ready - check whether the playback buffer is available
691 * @substream: the pcm substream instance
692 *
693 * Checks whether enough free space is available on the playback buffer.
694 *
695 * Returns non-zero if available, or zero if not.
696 */
697static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
698{
699 struct snd_pcm_runtime *runtime = substream->runtime;
700 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
701}
702
703/**
704 * snd_pcm_capture_ready - check whether the capture buffer is available
705 * @substream: the pcm substream instance
706 *
707 * Checks whether enough capture data is available on the capture buffer.
708 *
709 * Returns non-zero if available, or zero if not.
710 */
711static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
712{
713 struct snd_pcm_runtime *runtime = substream->runtime;
714 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
715}
716
717/**
718 * snd_pcm_playback_data - check whether any data exists on the playback buffer
719 * @substream: the pcm substream instance
720 *
721 * Checks whether any data exists on the playback buffer. If stop_threshold
722 * is bigger or equal to boundary, then this function returns always non-zero.
723 *
724 * Returns non-zero if exists, or zero if not.
725 */
726static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
727{
728 struct snd_pcm_runtime *runtime = substream->runtime;
729
730 if (runtime->stop_threshold >= runtime->boundary)
731 return 1;
732 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
733}
734
735/**
736 * snd_pcm_playback_empty - check whether the playback buffer is empty
737 * @substream: the pcm substream instance
738 *
739 * Checks whether the playback buffer is empty.
740 *
741 * Returns non-zero if empty, or zero if not.
742 */
743static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
744{
745 struct snd_pcm_runtime *runtime = substream->runtime;
746 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
747}
748
749/**
750 * snd_pcm_capture_empty - check whether the capture buffer is empty
751 * @substream: the pcm substream instance
752 *
753 * Checks whether the capture buffer is empty.
754 *
755 * Returns non-zero if empty, or zero if not.
756 */
757static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
758{
759 struct snd_pcm_runtime *runtime = substream->runtime;
760 return snd_pcm_capture_avail(runtime) == 0;
761}
762
763static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
764 struct snd_pcm_substream *master)
765{
766 substream->runtime->trigger_master = master;
767}
768
769static inline int hw_is_mask(int var)
770{
771 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
772 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
773}
774
775static inline int hw_is_interval(int var)
776{
777 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
778 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
779}
780
781static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
782 snd_pcm_hw_param_t var)
783{
784 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
785}
786
787static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
788 snd_pcm_hw_param_t var)
789{
790 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
791}
792
793static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
794 snd_pcm_hw_param_t var)
795{
796 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
797}
798
799static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
800 snd_pcm_hw_param_t var)
801{
802 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
803}
804
805#define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
806#define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
807#define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
808#define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
809#define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
810#define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
811#define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
812#define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
813#define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
814#define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
815
816
817int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
818void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
819void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
820void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
821 unsigned int k, struct snd_interval *c);
822void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
823 const struct snd_interval *b, struct snd_interval *c);
824int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
825int snd_interval_ratnum(struct snd_interval *i,
826 unsigned int rats_count, struct snd_ratnum *rats,
827 unsigned int *nump, unsigned int *denp);
828
829void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
830void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
831int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
832
833int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
834
835int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
836int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
837
838int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
839 u_int32_t mask);
840int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
841 u_int64_t mask);
842int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
843 unsigned int min, unsigned int max);
844int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
845int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
846 unsigned int cond,
847 snd_pcm_hw_param_t var,
848 struct snd_pcm_hw_constraint_list *l);
849int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
850 unsigned int cond,
851 snd_pcm_hw_param_t var,
852 struct snd_pcm_hw_constraint_ratnums *r);
853int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
854 unsigned int cond,
855 snd_pcm_hw_param_t var,
856 struct snd_pcm_hw_constraint_ratdens *r);
857int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
858 unsigned int cond,
859 unsigned int width,
860 unsigned int msbits);
861int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
862 unsigned int cond,
863 snd_pcm_hw_param_t var,
864 unsigned long step);
865int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
866 unsigned int cond,
867 snd_pcm_hw_param_t var);
868int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
869 unsigned int cond,
870 int var,
871 snd_pcm_hw_rule_func_t func, void *private,
872 int dep, ...);
873
874int snd_pcm_format_signed(snd_pcm_format_t format);
875int snd_pcm_format_unsigned(snd_pcm_format_t format);
876int snd_pcm_format_linear(snd_pcm_format_t format);
877int snd_pcm_format_little_endian(snd_pcm_format_t format);
878int snd_pcm_format_big_endian(snd_pcm_format_t format);
879#if 0 /* just for DocBook */
880/**
881 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
882 * @format: the format to check
883 *
884 * Returns 1 if the given PCM format is CPU-endian, 0 if
885 * opposite, or a negative error code if endian not specified.
886 */
887int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
888#endif /* DocBook */
889#ifdef SNDRV_LITTLE_ENDIAN
890#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
891#else
892#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
893#endif
894int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
895int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
896ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
897const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
898int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
899snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
900
901void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
902void snd_pcm_set_sync(struct snd_pcm_substream *substream);
903int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
904int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
905 unsigned int cmd, void *arg);
906int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
907int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
908int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
909int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
910int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
911void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
912void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
913snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
914 const void __user *buf,
915 snd_pcm_uframes_t frames);
916snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
917 void __user *buf, snd_pcm_uframes_t frames);
918snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
919 void __user **bufs, snd_pcm_uframes_t frames);
920snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
921 void __user **bufs, snd_pcm_uframes_t frames);
922
923extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
924
925int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
926unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
927
928static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
929 struct snd_dma_buffer *bufp)
930{
931 struct snd_pcm_runtime *runtime = substream->runtime;
932 if (bufp) {
933 runtime->dma_buffer_p = bufp;
934 runtime->dma_area = bufp->area;
935 runtime->dma_addr = bufp->addr;
936 runtime->dma_bytes = bufp->bytes;
937 } else {
938 runtime->dma_buffer_p = NULL;
939 runtime->dma_area = NULL;
940 runtime->dma_addr = 0;
941 runtime->dma_bytes = 0;
942 }
943}
944
945/*
946 * Timer interface
947 */
948
949void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
950void snd_pcm_timer_init(struct snd_pcm_substream *substream);
951void snd_pcm_timer_done(struct snd_pcm_substream *substream);
952
953static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
954 struct timespec *tv)
955{
956 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
957 do_posix_clock_monotonic_gettime(tv);
958 else
959 getnstimeofday(tv);
960}
961
962/*
963 * Memory
964 */
965
966int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
967int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
968int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
969 int type, struct device *data,
970 size_t size, size_t max);
971int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
972 int type, void *data,
973 size_t size, size_t max);
974int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
975int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
976
977/*
978 * SG-buffer handling
979 */
980#define snd_pcm_substream_sgbuf(substream) \
981 ((substream)->runtime->dma_buffer_p->private_data)
982
983static inline dma_addr_t
984snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
985{
986 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
987 return snd_sgbuf_get_addr(sg, ofs);
988}
989
990static inline void *
991snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
992{
993 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
994 return snd_sgbuf_get_ptr(sg, ofs);
995}
996
997struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
998 unsigned long offset);
999unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1000 unsigned int ofs, unsigned int size);
1001
1002/* handle mmap counter - PCM mmap callback should handle this counter properly */
1003static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1004{
1005 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1006 atomic_inc(&substream->mmap_count);
1007}
1008
1009static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1010{
1011 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1012 atomic_dec(&substream->mmap_count);
1013}
1014
1015/* mmap for io-memory area */
1016#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1017#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1018int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1019#else
1020#define SNDRV_PCM_INFO_MMAP_IOMEM 0
1021#define snd_pcm_lib_mmap_iomem NULL
1022#endif
1023
1024static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1025{
1026 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1027}
1028
1029/*
1030 * Misc
1031 */
1032
1033#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1034 (IEC958_AES1_CON_ORIGINAL<<8)|\
1035 (IEC958_AES1_CON_PCM_CODER<<8)|\
1036 (IEC958_AES3_CON_FS_48000<<24))
1037
1038#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1039
1040#endif /* __SOUND_PCM_H */