source: GPL/alsa-kernel/include/sound/pcm.h@ 2

Last change on this file since 2 was 1, checked in by vladest, 20 years ago

initial import
File size: 36.4 KB
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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@suse.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 <linux/poll.h>
29#include <linux/bitops.h>
30
31#define snd_pcm_substream_chip(substream) ((substream)->private_data)
32#define snd_pcm_chip(pcm) ((pcm)->private_data)
33
34#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
35#include "pcm_oss.h"
36#endif
37
38/*
39 * Hardware (lowlevel) section
40 */
41
42struct snd_pcm_hardware {
43 unsigned int info; /* SNDRV_PCM_INFO_* */
44 u64 formats; /* SNDRV_PCM_FMTBIT_* */
45 unsigned int rates; /* SNDRV_PCM_RATE_* */
46 unsigned int rate_min; /* min rate */
47 unsigned int rate_max; /* max rate */
48 unsigned int channels_min; /* min channels */
49 unsigned int channels_max; /* max channels */
50 size_t buffer_bytes_max; /* max buffer size */
51 size_t period_bytes_min; /* min period size */
52 size_t period_bytes_max; /* max period size */
53 unsigned int periods_min; /* min # of periods */
54 unsigned int periods_max; /* max # of periods */
55 size_t fifo_size; /* fifo size in bytes */
56};
57
58struct snd_pcm_ops {
59 int (*open)(struct snd_pcm_substream *substream);
60 int (*close)(struct snd_pcm_substream *substream);
61 int (*ioctl)(struct snd_pcm_substream * substream,
62 unsigned int cmd, void *arg);
63 int (*hw_params)(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params *params);
65 int (*hw_free)(struct snd_pcm_substream *substream);
66 int (*prepare)(struct snd_pcm_substream *substream);
67 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
68 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
69 int (*copy)(struct snd_pcm_substream *substream, int channel,
70 snd_pcm_uframes_t pos,
71 void __user *buf, snd_pcm_uframes_t count);
72 int (*silence)(struct snd_pcm_substream *substream, int channel,
73 snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
74 struct page *(*page)(struct snd_pcm_substream *substream,
75 unsigned long offset);
76 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
77 int (*ack)(struct snd_pcm_substream *substream);
78};
79
80/*
81 *
82 */
83
84#define SNDRV_PCM_DEVICES 8
85
86#define SNDRV_PCM_IOCTL1_FALSE ((void *)0)
87#define SNDRV_PCM_IOCTL1_TRUE ((void *)1)
88
89#define SNDRV_PCM_IOCTL1_RESET 0
90#define SNDRV_PCM_IOCTL1_INFO 1
91#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
92#define SNDRV_PCM_IOCTL1_GSTATE 3
93
94#define SNDRV_PCM_TRIGGER_STOP 0
95#define SNDRV_PCM_TRIGGER_START 1
96#define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
97#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
98#define SNDRV_PCM_TRIGGER_SUSPEND 5
99#define SNDRV_PCM_TRIGGER_RESUME 6
100
101#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
102
103/* If you change this don't forget to change rates[] table in pcm_native.c */
104#define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
105#define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
106#define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
107#define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
108#define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
109#define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
110#define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
111#define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
112#define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
113#define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
114#define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
115#define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
116#define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
117
118#define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
119#define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
120
121#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
122 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
123 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
124#define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
125#define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
126 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
127#define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
128 SNDRV_PCM_RATE_192000)
129#define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8)
130#define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8)
131#define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE)
132#define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE)
133#define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE)
134#define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE)
135#define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE)
136#define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE)
137#define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE)
138#define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE)
139#define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE)
140#define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE)
141#define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE)
142#define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE)
143#define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
144#define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
145#define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
146#define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
147#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
148#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
149#define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
150#define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW)
151#define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
152#define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG)
153#define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM)
154#define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
155#define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
156#define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
157#define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
158#define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
159#define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
160#define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
161#define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
162#define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
163#define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
164#define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
165#define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
166#define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
167
168#ifdef SNDRV_LITTLE_ENDIAN
169#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
170#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
171#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
172#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
173#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
174#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
175#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
176#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
177#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
178#endif
179#ifdef SNDRV_BIG_ENDIAN
180#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
181#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
182#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
183#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
184#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
185#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
186#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
187#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
188#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
189#endif
190
191struct snd_pcm_file {
192 struct snd_pcm_substream *substream;
193 struct snd_pcm_file *next;
194};
195
196struct snd_pcm_hw_rule;
197typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
198 struct snd_pcm_hw_rule *rule);
199
200struct snd_pcm_hw_rule {
201 unsigned int cond;
202 snd_pcm_hw_rule_func_t func;
203 int var;
204 int deps[4];
205 void *private;
206};
207
208struct snd_pcm_hw_constraints {
209 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
210 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
211 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
212 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
213 unsigned int rules_num;
214 unsigned int rules_all;
215 struct snd_pcm_hw_rule *rules;
216};
217
218static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
219 snd_pcm_hw_param_t var)
220{
221 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
222}
223
224static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
225 snd_pcm_hw_param_t var)
226{
227 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
228}
229
230struct snd_ratnum {
231 unsigned int num;
232 unsigned int den_min, den_max, den_step;
233};
234
235struct snd_ratden {
236 unsigned int num_min, num_max, num_step;
237 unsigned int den;
238};
239
240struct snd_pcm_hw_constraint_ratnums {
241 int nrats;
242 struct snd_ratnum *rats;
243};
244
245struct snd_pcm_hw_constraint_ratdens {
246 int nrats;
247 struct snd_ratden *rats;
248};
249
250struct snd_pcm_hw_constraint_list {
251 unsigned int count;
252 unsigned int *list;
253 unsigned int mask;
254};
255
256struct snd_pcm_runtime {
257 /* -- Status -- */
258 struct snd_pcm_substream *trigger_master;
259 struct timespec trigger_tstamp; /* trigger timestamp */
260 int overrange;
261 snd_pcm_uframes_t avail_max;
262 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
263 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
264
265 /* -- HW params -- */
266 snd_pcm_access_t access; /* access mode */
267 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
268 snd_pcm_subformat_t subformat; /* subformat */
269 unsigned int rate; /* rate in Hz */
270 unsigned int channels; /* channels */
271 snd_pcm_uframes_t period_size; /* period size */
272 unsigned int periods; /* periods */
273 snd_pcm_uframes_t buffer_size; /* buffer size */
274 unsigned int tick_time; /* tick time */
275 snd_pcm_uframes_t min_align; /* Min alignment for the format */
276 size_t byte_align;
277 unsigned int frame_bits;
278 unsigned int sample_bits;
279 unsigned int info;
280 unsigned int rate_num;
281 unsigned int rate_den;
282
283 /* -- SW params -- */
284 int tstamp_mode; /* mmap timestamp is updated */
285 unsigned int period_step;
286 unsigned int sleep_min; /* min ticks to sleep */
287 snd_pcm_uframes_t xfer_align; /* xfer size need to be a multiple */
288 snd_pcm_uframes_t start_threshold;
289 snd_pcm_uframes_t stop_threshold;
290 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
291 noise is nearest than this */
292 snd_pcm_uframes_t silence_size; /* Silence filling size */
293 snd_pcm_uframes_t boundary; /* pointers wrap point */
294
295 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
296 snd_pcm_uframes_t silence_filled; /* size filled with silence */
297
298 union snd_pcm_sync_id sync; /* hardware synchronization ID */
299
300 /* -- mmap -- */
301 volatile struct snd_pcm_mmap_status *status;
302 volatile struct snd_pcm_mmap_control *control;
303 atomic_t mmap_count;
304
305 /* -- locking / scheduling -- */
306 wait_queue_head_t sleep;
307 struct timer_list tick_timer;
308 struct fasync_struct *fasync;
309
310 /* -- private section -- */
311 void *private_data;
312 void (*private_free)(struct snd_pcm_runtime *runtime);
313
314 /* -- hardware description -- */
315 struct snd_pcm_hardware hw;
316 struct snd_pcm_hw_constraints hw_constraints;
317
318 /* -- interrupt callbacks -- */
319 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
320 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
321
322 /* -- timer -- */
323 unsigned int timer_resolution; /* timer resolution */
324
325 /* -- DMA -- */
326 unsigned char *dma_area; /* DMA area */
327 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
328 size_t dma_bytes; /* size of DMA area */
329
330 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
331
332#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
333 /* -- OSS things -- */
334 struct snd_pcm_oss_runtime oss;
335#endif
336};
337
338struct snd_pcm_group { /* keep linked substreams */
339 spinlock_t lock;
340 struct list_head substreams;
341 int count;
342};
343
344struct snd_pcm_substream {
345 struct snd_pcm *pcm;
346 struct snd_pcm_str *pstr;
347 void *private_data; /* copied from pcm->private_data */
348 int number;
349 char name[32]; /* substream name */
350 int stream; /* stream (direction) */
351 size_t buffer_bytes_max; /* limit ring buffer size */
352 struct snd_dma_buffer dma_buffer;
353 unsigned int dma_buf_id;
354 size_t dma_max;
355 /* -- hardware operations -- */
356 struct snd_pcm_ops *ops;
357 /* -- runtime information -- */
358 struct snd_pcm_runtime *runtime;
359 /* -- timer section -- */
360 struct snd_timer *timer; /* timer */
361 unsigned timer_running: 1; /* time is running */
362 spinlock_t timer_lock;
363 /* -- next substream -- */
364 struct snd_pcm_substream *next;
365 /* -- linked substreams -- */
366 struct list_head link_list; /* linked list member */
367 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
368 struct snd_pcm_group *group; /* pointer to current group */
369 /* -- assigned files -- */
370 struct snd_pcm_file *file;
371 struct file *ffile;
372#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
373 /* -- OSS things -- */
374 struct snd_pcm_oss_substream oss;
375#endif
376 struct snd_info_entry *proc_root;
377 struct snd_info_entry *proc_info_entry;
378 struct snd_info_entry *proc_hw_params_entry;
379 struct snd_info_entry *proc_sw_params_entry;
380 struct snd_info_entry *proc_status_entry;
381 struct snd_info_entry *proc_prealloc_entry;
382 /* misc flags */
383 unsigned int no_mmap_ctrl: 1;
384};
385
386#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
387#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL || ((substream)->oss.file != NULL))
388#else
389#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
390#endif
391
392
393struct snd_pcm_str {
394 int stream; /* stream (direction) */
395 struct snd_pcm *pcm;
396 /* -- substreams -- */
397 unsigned int substream_count;
398 unsigned int substream_opened;
399 struct snd_pcm_substream *substream;
400#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
401 /* -- OSS things -- */
402 struct snd_pcm_oss_stream oss;
403#endif
404 struct snd_pcm_file *files;
405 struct snd_minor *reg;
406 struct snd_info_entry *proc_root;
407 struct snd_info_entry *proc_info_entry;
408#ifdef CONFIG_SND_DEBUG
409 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
410 struct snd_info_entry *proc_xrun_debug_entry;
411#endif
412};
413
414struct snd_pcm {
415 struct snd_card *card;
416 unsigned int device; /* device number */
417 unsigned int info_flags;
418 unsigned short dev_class;
419 unsigned short dev_subclass;
420 char id[64];
421 char name[80];
422 struct snd_pcm_str streams[2];
423 struct semaphore open_mutex;
424 wait_queue_head_t open_wait;
425 void *private_data;
426 void (*private_free) (struct snd_pcm *pcm);
427#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
428 struct snd_pcm_oss oss;
429#endif
430};
431
432struct snd_pcm_notify {
433 int (*n_register) (struct snd_pcm * pcm);
434 int (*n_disconnect) (struct snd_pcm * pcm);
435 int (*n_unregister) (struct snd_pcm * pcm);
436 struct list_head list;
437};
438
439/*
440 * Registering
441 */
442
443extern struct snd_pcm *snd_pcm_devices[];
444extern struct snd_minor snd_pcm_reg[2];
445
446int snd_pcm_new(struct snd_card *card, char *id, int device,
447 int playback_count, int capture_count,
448 struct snd_pcm **rpcm);
449int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
450
451int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
452
453/*
454 * Native I/O
455 */
456
457extern rwlock_t snd_pcm_link_rwlock;
458
459int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
460int snd_pcm_info_user(struct snd_pcm_substream *substream,
461 struct snd_pcm_info __user *info);
462int snd_pcm_status(struct snd_pcm_substream *substream,
463 struct snd_pcm_status *status);
464int snd_pcm_prepare(struct snd_pcm_substream *substream);
465int snd_pcm_start(struct snd_pcm_substream *substream);
466int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
467int snd_pcm_drain_done(struct snd_pcm_substream *substream);
468#ifdef CONFIG_PM
469int snd_pcm_suspend(struct snd_pcm_substream *substream);
470int snd_pcm_suspend_all(struct snd_pcm *pcm);
471#endif
472int snd_pcm_kernel_playback_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
473int snd_pcm_kernel_capture_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
474int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
475int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct snd_pcm_substream **rsubstream);
476void snd_pcm_release_substream(struct snd_pcm_substream *substream);
477void snd_pcm_vma_notify_data(void *client, void *data);
478int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
479
480#if BITS_PER_LONG >= 64
481
482static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
483{
484 *rem = *n % div;
485 *n /= div;
486}
487
488#elif defined(i386)
489
490static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
491{
492 u_int32_t low, high;
493 low = *n & 0xffffffff;
494 high = *n >> 32;
495 if (high) {
496 u_int32_t high1 = high % div;
497 high /= div;
498 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
499 *n = (u_int64_t)high << 32 | low;
500 } else {
501 *n = low / div;
502 *rem = low % div;
503 }
504}
505#else
506
507static inline void divl(u_int32_t high, u_int32_t low,
508 u_int32_t div,
509 u_int32_t *q, u_int32_t *r)
510{
511 u_int64_t n = (u_int64_t)high << 32 | low;
512 u_int64_t d = (u_int64_t)div << 31;
513 u_int32_t q1 = 0;
514 int c = 32;
515 while (n > 0xffffffffU) {
516 q1 <<= 1;
517 if (n >= d) {
518 n -= d;
519 q1 |= 1;
520 }
521 d >>= 1;
522 c--;
523 }
524 q1 <<= c;
525 if (n) {
526 low = n;
527 *q = q1 | (low / div);
528 *r = low % div;
529 } else {
530 *r = 0;
531 *q = q1;
532 }
533 return;
534}
535
536static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
537{
538 u_int32_t low, high;
539 low = *n & 0xffffffff;
540 high = *n >> 32;
541 if (high) {
542 u_int32_t high1 = high % div;
543 u_int32_t low1 = low;
544 high /= div;
545 divl(high1, low1, div, &low, rem);
546 *n = (u_int64_t)high << 32 | low;
547 } else {
548 *n = low / div;
549 *rem = low % div;
550 }
551}
552#endif
553
554/*
555 * PCM library
556 */
557
558static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
559{
560 return substream->group != &substream->self_group;
561}
562
563static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
564{
565 read_lock(&snd_pcm_link_rwlock);
566 spin_lock(&substream->self_group.lock);
567}
568
569static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
570{
571 spin_unlock(&substream->self_group.lock);
572 read_unlock(&snd_pcm_link_rwlock);
573}
574
575static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
576{
577 read_lock_irq(&snd_pcm_link_rwlock);
578 spin_lock(&substream->self_group.lock);
579}
580
581static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
582{
583 spin_unlock(&substream->self_group.lock);
584 read_unlock_irq(&snd_pcm_link_rwlock);
585}
586
587#define snd_pcm_stream_lock_irqsave(substream, flags) \
588do { \
589 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
590 spin_lock(&substream->self_group.lock); \
591} while (0)
592
593#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
594do { \
595 spin_unlock(&substream->self_group.lock); \
596 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
597} while (0)
598
599#define snd_pcm_group_for_each(pos, substream) \
600 list_for_each(pos, &substream->group->substreams)
601
602#define snd_pcm_group_substream_entry(pos) \
603 list_entry(pos, struct snd_pcm_substream, link_list)
604
605static inline int snd_pcm_running(struct snd_pcm_substream *substream)
606{
607 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
608 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
609 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
610}
611
612static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
613{
614 return size * 8 / runtime->sample_bits;
615}
616
617static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
618{
619 return size * 8 / runtime->frame_bits;
620}
621
622static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
623{
624 return size * runtime->sample_bits / 8;
625}
626
627static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
628{
629 return size * runtime->frame_bits / 8;
630}
631
632static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
633{
634 return bytes % runtime->byte_align == 0;
635}
636
637static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
638{
639 struct snd_pcm_runtime *runtime = substream->runtime;
640 return frames_to_bytes(runtime, runtime->buffer_size);
641}
642
643static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
644{
645 struct snd_pcm_runtime *runtime = substream->runtime;
646 return frames_to_bytes(runtime, runtime->period_size);
647}
648
649/*
650 * result is: 0 ... (boundary - 1)
651 */
652static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
653{
654 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
655 if (avail < 0)
656 avail += runtime->boundary;
657 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
658 avail -= runtime->boundary;
659 return avail;
660}
661
662/*
663 * result is: 0 ... (boundary - 1)
664 */
665static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
666{
667 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
668 if (avail < 0)
669 avail += runtime->boundary;
670 return avail;
671}
672
673static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
674{
675 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
676}
677
678static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
679{
680 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
681}
682
683/**
684 * snd_pcm_playback_ready - check whether the playback buffer is available
685 * @substream: the pcm substream instance
686 *
687 * Checks whether enough free space is available on the playback buffer.
688 *
689 * Returns non-zero if available, or zero if not.
690 */
691static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
692{
693 struct snd_pcm_runtime *runtime = substream->runtime;
694 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
695}
696
697/**
698 * snd_pcm_capture_ready - check whether the capture buffer is available
699 * @substream: the pcm substream instance
700 *
701 * Checks whether enough capture data is available on the capture buffer.
702 *
703 * Returns non-zero if available, or zero if not.
704 */
705static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
706{
707 struct snd_pcm_runtime *runtime = substream->runtime;
708 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
709}
710
711/**
712 * snd_pcm_playback_data - check whether any data exists on the playback buffer
713 * @substream: the pcm substream instance
714 *
715 * Checks whether any data exists on the playback buffer. If stop_threshold
716 * is bigger or equal to boundary, then this function returns always non-zero.
717 *
718 * Returns non-zero if exists, or zero if not.
719 */
720static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
721{
722 struct snd_pcm_runtime *runtime = substream->runtime;
723
724 if (runtime->stop_threshold >= runtime->boundary)
725 return 1;
726 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
727}
728
729/**
730 * snd_pcm_playback_empty - check whether the playback buffer is empty
731 * @substream: the pcm substream instance
732 *
733 * Checks whether the playback buffer is empty.
734 *
735 * Returns non-zero if empty, or zero if not.
736 */
737static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
738{
739 struct snd_pcm_runtime *runtime = substream->runtime;
740 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
741}
742
743/**
744 * snd_pcm_capture_empty - check whether the capture buffer is empty
745 * @substream: the pcm substream instance
746 *
747 * Checks whether the capture buffer is empty.
748 *
749 * Returns non-zero if empty, or zero if not.
750 */
751static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
752{
753 struct snd_pcm_runtime *runtime = substream->runtime;
754 return snd_pcm_capture_avail(runtime) == 0;
755}
756
757static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
758 struct snd_pcm_substream *master)
759{
760 substream->runtime->trigger_master = master;
761}
762
763static inline int hw_is_mask(int var)
764{
765 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
766 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
767}
768
769static inline int hw_is_interval(int var)
770{
771 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
772 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
773}
774
775static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
776 snd_pcm_hw_param_t var)
777{
778 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
779}
780
781static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
782 snd_pcm_hw_param_t var)
783{
784 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
785}
786
787static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
788 snd_pcm_hw_param_t var)
789{
790 return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
791}
792
793static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
794 snd_pcm_hw_param_t var)
795{
796 return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
797}
798
799#define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
800#define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
801#define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
802#define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
803#define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
804#define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
805#define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
806#define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
807#define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
808#define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
809#define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
810
811
812int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
813void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
814void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
815void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
816 unsigned int k, struct snd_interval *c);
817void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
818 const struct snd_interval *b, struct snd_interval *c);
819int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
820int snd_interval_ratnum(struct snd_interval *i,
821 unsigned int rats_count, struct snd_ratnum *rats,
822 unsigned int *nump, unsigned int *denp);
823
824void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
825void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
826int snd_pcm_hw_param_near(struct snd_pcm_substream *substream,
827 struct snd_pcm_hw_params *params,
828 snd_pcm_hw_param_t var,
829 unsigned int val, int *dir);
830int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
831 struct snd_pcm_hw_params *params,
832 snd_pcm_hw_param_t var,
833 unsigned int val, int dir);
834int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
835
836int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
837
838int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
839int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
840
841int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
842 u_int32_t mask);
843int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
844 u_int64_t mask);
845int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
846 unsigned int min, unsigned int max);
847int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
848int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
849 unsigned int cond,
850 snd_pcm_hw_param_t var,
851 struct snd_pcm_hw_constraint_list *l);
852int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
853 unsigned int cond,
854 snd_pcm_hw_param_t var,
855 struct snd_pcm_hw_constraint_ratnums *r);
856int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
857 unsigned int cond,
858 snd_pcm_hw_param_t var,
859 struct snd_pcm_hw_constraint_ratdens *r);
860int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
861 unsigned int cond,
862 unsigned int width,
863 unsigned int msbits);
864int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
865 unsigned int cond,
866 snd_pcm_hw_param_t var,
867 unsigned long step);
868int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
869 unsigned int cond,
870 snd_pcm_hw_param_t var);
871int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
872 unsigned int cond,
873 int var,
874 snd_pcm_hw_rule_func_t func, void *private,
875 int dep, ...);
876
877int snd_pcm_format_signed(snd_pcm_format_t format);
878int snd_pcm_format_unsigned(snd_pcm_format_t format);
879int snd_pcm_format_linear(snd_pcm_format_t format);
880int snd_pcm_format_little_endian(snd_pcm_format_t format);
881int snd_pcm_format_big_endian(snd_pcm_format_t format);
882#if 0 /* just for DocBook */
883/**
884 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
885 * @format: the format to check
886 *
887 * Returns 1 if the given PCM format is CPU-endian, 0 if
888 * opposite, or a negative error code if endian not specified.
889 */
890int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
891#endif /* DocBook */
892#ifdef SNDRV_LITTLE_ENDIAN
893#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
894#else
895#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
896#endif
897int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
898int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
899ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
900const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
901int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
902snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
903const char *snd_pcm_format_name(snd_pcm_format_t format);
904
905void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
906void snd_pcm_set_sync(struct snd_pcm_substream *substream);
907int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
908int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
909 unsigned int cmd, void *arg);
910int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
911int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
912int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
913int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
914int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
915void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
916void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
917void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
918void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
919void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
920snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
921 const void __user *buf,
922 snd_pcm_uframes_t frames);
923snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
924 void __user *buf, snd_pcm_uframes_t frames);
925snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
926 void __user **bufs, snd_pcm_uframes_t frames);
927snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
928 void __user **bufs, snd_pcm_uframes_t frames);
929
930int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
931
932static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
933 struct snd_dma_buffer *bufp)
934{
935 struct snd_pcm_runtime *runtime = substream->runtime;
936 if (bufp) {
937 runtime->dma_buffer_p = bufp;
938 runtime->dma_area = bufp->area;
939 runtime->dma_addr = bufp->addr;
940 runtime->dma_bytes = bufp->bytes;
941 } else {
942 runtime->dma_buffer_p = NULL;
943 runtime->dma_area = NULL;
944 runtime->dma_addr = 0;
945 runtime->dma_bytes = 0;
946 }
947}
948
949/*
950 * Timer interface
951 */
952
953void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
954void snd_pcm_timer_init(struct snd_pcm_substream *substream);
955void snd_pcm_timer_done(struct snd_pcm_substream *substream);
956
957/*
958 * Memory
959 */
960
961int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
962int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
963int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
964 int type, struct device *data,
965 size_t size, size_t max);
966int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
967 int type, void *data,
968 size_t size, size_t max);
969int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
970int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
971
972#define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
973#define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
974#define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
975struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
976
977/* handle mmap counter - PCM mmap callback should handle this counter properly */
978static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
979{
980 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
981 atomic_inc(&substream->runtime->mmap_count);
982}
983
984static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
985{
986 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
987 atomic_dec(&substream->runtime->mmap_count);
988}
989
990/* mmap for io-memory area */
991#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
992#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
993int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
994#else
995#define SNDRV_PCM_INFO_MMAP_IOMEM 0
996#define snd_pcm_lib_mmap_iomem NULL
997#endif
998
999static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1000{
1001 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1002}
1003
1004/*
1005 * Misc
1006 */
1007
1008#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1009 (IEC958_AES1_CON_ORIGINAL<<8)|\
1010 (IEC958_AES1_CON_PCM_CODER<<8)|\
1011 (IEC958_AES3_CON_FS_48000<<24))
1012
1013#endif /* __SOUND_PCM_H */
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