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Linux kernel mirror (for testing)
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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@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#include <linux/pm_qos.h>
33
34#define snd_pcm_substream_chip(substream) ((substream)->private_data)
35#define snd_pcm_chip(pcm) ((pcm)->private_data)
36
37#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
38#include <sound/pcm_oss.h>
39#endif
40
41/*
42 * Hardware (lowlevel) section
43 */
44
45struct snd_pcm_hardware {
46 unsigned int info; /* SNDRV_PCM_INFO_* */
47 u64 formats; /* SNDRV_PCM_FMTBIT_* */
48 unsigned int rates; /* SNDRV_PCM_RATE_* */
49 unsigned int rate_min; /* min rate */
50 unsigned int rate_max; /* max rate */
51 unsigned int channels_min; /* min channels */
52 unsigned int channels_max; /* max channels */
53 size_t buffer_bytes_max; /* max buffer size */
54 size_t period_bytes_min; /* min period size */
55 size_t period_bytes_max; /* max period size */
56 unsigned int periods_min; /* min # of periods */
57 unsigned int periods_max; /* max # of periods */
58 size_t fifo_size; /* fifo size in bytes */
59};
60
61struct snd_pcm_substream;
62
63struct snd_pcm_ops {
64 int (*open)(struct snd_pcm_substream *substream);
65 int (*close)(struct snd_pcm_substream *substream);
66 int (*ioctl)(struct snd_pcm_substream * substream,
67 unsigned int cmd, void *arg);
68 int (*hw_params)(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params *params);
70 int (*hw_free)(struct snd_pcm_substream *substream);
71 int (*prepare)(struct snd_pcm_substream *substream);
72 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
73 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
74 int (*wall_clock)(struct snd_pcm_substream *substream,
75 struct timespec *audio_ts);
76 int (*copy)(struct snd_pcm_substream *substream, int channel,
77 snd_pcm_uframes_t pos,
78 void __user *buf, snd_pcm_uframes_t count);
79 int (*silence)(struct snd_pcm_substream *substream, int channel,
80 snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
81 struct page *(*page)(struct snd_pcm_substream *substream,
82 unsigned long offset);
83 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
84 int (*ack)(struct snd_pcm_substream *substream);
85};
86
87/*
88 *
89 */
90
91#if defined(CONFIG_SND_DYNAMIC_MINORS)
92#define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
93#else
94#define SNDRV_PCM_DEVICES 8
95#endif
96
97#define SNDRV_PCM_IOCTL1_FALSE ((void *)0)
98#define SNDRV_PCM_IOCTL1_TRUE ((void *)1)
99
100#define SNDRV_PCM_IOCTL1_RESET 0
101#define SNDRV_PCM_IOCTL1_INFO 1
102#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
103#define SNDRV_PCM_IOCTL1_GSTATE 3
104#define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
105
106#define SNDRV_PCM_TRIGGER_STOP 0
107#define SNDRV_PCM_TRIGGER_START 1
108#define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
109#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
110#define SNDRV_PCM_TRIGGER_SUSPEND 5
111#define SNDRV_PCM_TRIGGER_RESUME 6
112
113#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
114
115/* If you change this don't forget to change rates[] table in pcm_native.c */
116#define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
117#define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
118#define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
119#define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
120#define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
121#define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
122#define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
123#define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
124#define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
125#define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
126#define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
127#define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
128#define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
129
130#define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
131#define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
132
133#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
134 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
135 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
136#define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
137#define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
138 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
139#define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
140 SNDRV_PCM_RATE_192000)
141#define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
142#define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
143#define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
144#define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
145#define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
146#define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
147#define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
148#define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
149#define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
150#define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
151#define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
152#define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
153#define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
154#define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
155#define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
156#define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
157#define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
158#define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
159#define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
160#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
161#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
162#define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
163#define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
164#define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
165#define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
166#define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
167#define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
168#define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
169#define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
170#define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
171#define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
172#define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
173#define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
174#define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
175#define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
176#define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
177#define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
178#define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
179#define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
180#define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
181#define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
182#define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
183#define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
184#define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
185#define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
186
187#ifdef SNDRV_LITTLE_ENDIAN
188#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
189#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
190#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
191#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
192#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
193#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
194#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
195#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
196#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
197#endif
198#ifdef SNDRV_BIG_ENDIAN
199#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
200#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
201#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
202#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
203#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
204#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
205#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
206#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
207#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
208#endif
209
210struct snd_pcm_file {
211 struct snd_pcm_substream *substream;
212 int no_compat_mmap;
213};
214
215struct snd_pcm_hw_rule;
216typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
217 struct snd_pcm_hw_rule *rule);
218
219struct snd_pcm_hw_rule {
220 unsigned int cond;
221 snd_pcm_hw_rule_func_t func;
222 int var;
223 int deps[4];
224 void *private;
225};
226
227struct snd_pcm_hw_constraints {
228 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
229 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
230 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
231 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
232 unsigned int rules_num;
233 unsigned int rules_all;
234 struct snd_pcm_hw_rule *rules;
235};
236
237static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
238 snd_pcm_hw_param_t var)
239{
240 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
241}
242
243static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
244 snd_pcm_hw_param_t var)
245{
246 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
247}
248
249struct snd_ratnum {
250 unsigned int num;
251 unsigned int den_min, den_max, den_step;
252};
253
254struct snd_ratden {
255 unsigned int num_min, num_max, num_step;
256 unsigned int den;
257};
258
259struct snd_pcm_hw_constraint_ratnums {
260 int nrats;
261 struct snd_ratnum *rats;
262};
263
264struct snd_pcm_hw_constraint_ratdens {
265 int nrats;
266 struct snd_ratden *rats;
267};
268
269struct snd_pcm_hw_constraint_list {
270 unsigned int count;
271 const unsigned int *list;
272 unsigned int mask;
273};
274
275struct snd_pcm_hwptr_log;
276
277struct snd_pcm_runtime {
278 /* -- Status -- */
279 struct snd_pcm_substream *trigger_master;
280 struct timespec trigger_tstamp; /* trigger timestamp */
281 int overrange;
282 snd_pcm_uframes_t avail_max;
283 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
284 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
285 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
286 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
287 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
288 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
289
290 /* -- HW params -- */
291 snd_pcm_access_t access; /* access mode */
292 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
293 snd_pcm_subformat_t subformat; /* subformat */
294 unsigned int rate; /* rate in Hz */
295 unsigned int channels; /* channels */
296 snd_pcm_uframes_t period_size; /* period size */
297 unsigned int periods; /* periods */
298 snd_pcm_uframes_t buffer_size; /* buffer size */
299 snd_pcm_uframes_t min_align; /* Min alignment for the format */
300 size_t byte_align;
301 unsigned int frame_bits;
302 unsigned int sample_bits;
303 unsigned int info;
304 unsigned int rate_num;
305 unsigned int rate_den;
306 unsigned int no_period_wakeup: 1;
307
308 /* -- SW params -- */
309 int tstamp_mode; /* mmap timestamp is updated */
310 unsigned int period_step;
311 snd_pcm_uframes_t start_threshold;
312 snd_pcm_uframes_t stop_threshold;
313 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
314 noise is nearest than this */
315 snd_pcm_uframes_t silence_size; /* Silence filling size */
316 snd_pcm_uframes_t boundary; /* pointers wrap point */
317
318 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
319 snd_pcm_uframes_t silence_filled; /* size filled with silence */
320
321 union snd_pcm_sync_id sync; /* hardware synchronization ID */
322
323 /* -- mmap -- */
324 struct snd_pcm_mmap_status *status;
325 struct snd_pcm_mmap_control *control;
326
327 /* -- locking / scheduling -- */
328 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
329 wait_queue_head_t sleep; /* poll sleep */
330 wait_queue_head_t tsleep; /* transfer sleep */
331 struct fasync_struct *fasync;
332
333 /* -- private section -- */
334 void *private_data;
335 void (*private_free)(struct snd_pcm_runtime *runtime);
336
337 /* -- hardware description -- */
338 struct snd_pcm_hardware hw;
339 struct snd_pcm_hw_constraints hw_constraints;
340
341 /* -- interrupt callbacks -- */
342 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
343 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
344
345 /* -- timer -- */
346 unsigned int timer_resolution; /* timer resolution */
347 int tstamp_type; /* timestamp type */
348
349 /* -- DMA -- */
350 unsigned char *dma_area; /* DMA area */
351 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
352 size_t dma_bytes; /* size of DMA area */
353
354 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
355
356#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
357 /* -- OSS things -- */
358 struct snd_pcm_oss_runtime oss;
359#endif
360
361#ifdef CONFIG_SND_PCM_XRUN_DEBUG
362 struct snd_pcm_hwptr_log *hwptr_log;
363#endif
364};
365
366struct snd_pcm_group { /* keep linked substreams */
367 spinlock_t lock;
368 struct list_head substreams;
369 int count;
370};
371
372struct pid;
373
374struct snd_pcm_substream {
375 struct snd_pcm *pcm;
376 struct snd_pcm_str *pstr;
377 void *private_data; /* copied from pcm->private_data */
378 int number;
379 char name[32]; /* substream name */
380 int stream; /* stream (direction) */
381 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
382 size_t buffer_bytes_max; /* limit ring buffer size */
383 struct snd_dma_buffer dma_buffer;
384 size_t dma_max;
385 /* -- hardware operations -- */
386 const struct snd_pcm_ops *ops;
387 /* -- runtime information -- */
388 struct snd_pcm_runtime *runtime;
389 /* -- timer section -- */
390 struct snd_timer *timer; /* timer */
391 unsigned timer_running: 1; /* time is running */
392 /* -- next substream -- */
393 struct snd_pcm_substream *next;
394 /* -- linked substreams -- */
395 struct list_head link_list; /* linked list member */
396 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
397 struct snd_pcm_group *group; /* pointer to current group */
398 /* -- assigned files -- */
399 void *file;
400 int ref_count;
401 atomic_t mmap_count;
402 unsigned int f_flags;
403 void (*pcm_release)(struct snd_pcm_substream *);
404 struct pid *pid;
405#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
406 /* -- OSS things -- */
407 struct snd_pcm_oss_substream oss;
408#endif
409#ifdef CONFIG_SND_VERBOSE_PROCFS
410 struct snd_info_entry *proc_root;
411 struct snd_info_entry *proc_info_entry;
412 struct snd_info_entry *proc_hw_params_entry;
413 struct snd_info_entry *proc_sw_params_entry;
414 struct snd_info_entry *proc_status_entry;
415 struct snd_info_entry *proc_prealloc_entry;
416 struct snd_info_entry *proc_prealloc_max_entry;
417#endif
418 /* misc flags */
419 unsigned int hw_opened: 1;
420};
421
422#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
423
424
425struct snd_pcm_str {
426 int stream; /* stream (direction) */
427 struct snd_pcm *pcm;
428 /* -- substreams -- */
429 unsigned int substream_count;
430 unsigned int substream_opened;
431 struct snd_pcm_substream *substream;
432#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
433 /* -- OSS things -- */
434 struct snd_pcm_oss_stream oss;
435#endif
436#ifdef CONFIG_SND_VERBOSE_PROCFS
437 struct snd_info_entry *proc_root;
438 struct snd_info_entry *proc_info_entry;
439#ifdef CONFIG_SND_PCM_XRUN_DEBUG
440 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
441 struct snd_info_entry *proc_xrun_debug_entry;
442#endif
443#endif
444 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
445};
446
447struct snd_pcm {
448 struct snd_card *card;
449 struct list_head list;
450 int device; /* device number */
451 unsigned int info_flags;
452 unsigned short dev_class;
453 unsigned short dev_subclass;
454 char id[64];
455 char name[80];
456 struct snd_pcm_str streams[2];
457 struct mutex open_mutex;
458 wait_queue_head_t open_wait;
459 void *private_data;
460 void (*private_free) (struct snd_pcm *pcm);
461 struct device *dev; /* actual hw device this belongs to */
462 bool internal; /* pcm is for internal use only */
463#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
464 struct snd_pcm_oss oss;
465#endif
466};
467
468struct snd_pcm_notify {
469 int (*n_register) (struct snd_pcm * pcm);
470 int (*n_disconnect) (struct snd_pcm * pcm);
471 int (*n_unregister) (struct snd_pcm * pcm);
472 struct list_head list;
473};
474
475/*
476 * Registering
477 */
478
479extern const struct file_operations snd_pcm_f_ops[2];
480
481int snd_pcm_new(struct snd_card *card, const char *id, int device,
482 int playback_count, int capture_count,
483 struct snd_pcm **rpcm);
484int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
485 int playback_count, int capture_count,
486 struct snd_pcm **rpcm);
487int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
488
489int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
490
491/*
492 * Native I/O
493 */
494
495extern rwlock_t snd_pcm_link_rwlock;
496
497int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
498int snd_pcm_info_user(struct snd_pcm_substream *substream,
499 struct snd_pcm_info __user *info);
500int snd_pcm_status(struct snd_pcm_substream *substream,
501 struct snd_pcm_status *status);
502int snd_pcm_start(struct snd_pcm_substream *substream);
503int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
504int snd_pcm_drain_done(struct snd_pcm_substream *substream);
505#ifdef CONFIG_PM
506int snd_pcm_suspend(struct snd_pcm_substream *substream);
507int snd_pcm_suspend_all(struct snd_pcm *pcm);
508#endif
509int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
510int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
511 struct snd_pcm_substream **rsubstream);
512void snd_pcm_release_substream(struct snd_pcm_substream *substream);
513int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
514 struct snd_pcm_substream **rsubstream);
515void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
516void snd_pcm_vma_notify_data(void *client, void *data);
517int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
518
519
520#ifdef CONFIG_SND_DEBUG
521void snd_pcm_debug_name(struct snd_pcm_substream *substream,
522 char *name, size_t len);
523#else
524static inline void
525snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
526{
527 *buf = 0;
528}
529#endif
530
531/*
532 * PCM library
533 */
534
535static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
536{
537 return substream->group != &substream->self_group;
538}
539
540static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
541{
542 read_lock(&snd_pcm_link_rwlock);
543 spin_lock(&substream->self_group.lock);
544}
545
546static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
547{
548 spin_unlock(&substream->self_group.lock);
549 read_unlock(&snd_pcm_link_rwlock);
550}
551
552static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
553{
554 read_lock_irq(&snd_pcm_link_rwlock);
555 spin_lock(&substream->self_group.lock);
556}
557
558static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
559{
560 spin_unlock(&substream->self_group.lock);
561 read_unlock_irq(&snd_pcm_link_rwlock);
562}
563
564#define snd_pcm_stream_lock_irqsave(substream, flags) \
565do { \
566 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
567 spin_lock(&substream->self_group.lock); \
568} while (0)
569
570#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
571do { \
572 spin_unlock(&substream->self_group.lock); \
573 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
574} while (0)
575
576#define snd_pcm_group_for_each_entry(s, substream) \
577 list_for_each_entry(s, &substream->group->substreams, link_list)
578
579static inline int snd_pcm_running(struct snd_pcm_substream *substream)
580{
581 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
582 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
583 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
584}
585
586static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
587{
588 return size * 8 / runtime->sample_bits;
589}
590
591static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
592{
593 return size * 8 / runtime->frame_bits;
594}
595
596static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
597{
598 return size * runtime->sample_bits / 8;
599}
600
601static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
602{
603 return size * runtime->frame_bits / 8;
604}
605
606static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
607{
608 return bytes % runtime->byte_align == 0;
609}
610
611static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
612{
613 struct snd_pcm_runtime *runtime = substream->runtime;
614 return frames_to_bytes(runtime, runtime->buffer_size);
615}
616
617static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
618{
619 struct snd_pcm_runtime *runtime = substream->runtime;
620 return frames_to_bytes(runtime, runtime->period_size);
621}
622
623/*
624 * result is: 0 ... (boundary - 1)
625 */
626static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
627{
628 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
629 if (avail < 0)
630 avail += runtime->boundary;
631 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
632 avail -= runtime->boundary;
633 return avail;
634}
635
636/*
637 * result is: 0 ... (boundary - 1)
638 */
639static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
640{
641 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
642 if (avail < 0)
643 avail += runtime->boundary;
644 return avail;
645}
646
647static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
648{
649 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
650}
651
652static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
653{
654 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
655}
656
657/**
658 * snd_pcm_playback_ready - check whether the playback buffer is available
659 * @substream: the pcm substream instance
660 *
661 * Checks whether enough free space is available on the playback buffer.
662 *
663 * Return: Non-zero if available, or zero if not.
664 */
665static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
666{
667 struct snd_pcm_runtime *runtime = substream->runtime;
668 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
669}
670
671/**
672 * snd_pcm_capture_ready - check whether the capture buffer is available
673 * @substream: the pcm substream instance
674 *
675 * Checks whether enough capture data is available on the capture buffer.
676 *
677 * Return: Non-zero if available, or zero if not.
678 */
679static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
680{
681 struct snd_pcm_runtime *runtime = substream->runtime;
682 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
683}
684
685/**
686 * snd_pcm_playback_data - check whether any data exists on the playback buffer
687 * @substream: the pcm substream instance
688 *
689 * Checks whether any data exists on the playback buffer.
690 *
691 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
692 * is bigger or equal to boundary, then this function returns always non-zero.
693 */
694static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
695{
696 struct snd_pcm_runtime *runtime = substream->runtime;
697
698 if (runtime->stop_threshold >= runtime->boundary)
699 return 1;
700 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
701}
702
703/**
704 * snd_pcm_playback_empty - check whether the playback buffer is empty
705 * @substream: the pcm substream instance
706 *
707 * Checks whether the playback buffer is empty.
708 *
709 * Return: Non-zero if empty, or zero if not.
710 */
711static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
712{
713 struct snd_pcm_runtime *runtime = substream->runtime;
714 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
715}
716
717/**
718 * snd_pcm_capture_empty - check whether the capture buffer is empty
719 * @substream: the pcm substream instance
720 *
721 * Checks whether the capture buffer is empty.
722 *
723 * Return: Non-zero if empty, or zero if not.
724 */
725static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
726{
727 struct snd_pcm_runtime *runtime = substream->runtime;
728 return snd_pcm_capture_avail(runtime) == 0;
729}
730
731static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
732 struct snd_pcm_substream *master)
733{
734 substream->runtime->trigger_master = master;
735}
736
737static inline int hw_is_mask(int var)
738{
739 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
740 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
741}
742
743static inline int hw_is_interval(int var)
744{
745 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
746 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
747}
748
749static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
750 snd_pcm_hw_param_t var)
751{
752 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
753}
754
755static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
756 snd_pcm_hw_param_t var)
757{
758 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
759}
760
761static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
762 snd_pcm_hw_param_t var)
763{
764 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
765}
766
767static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
768 snd_pcm_hw_param_t var)
769{
770 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
771}
772
773#define params_channels(p) \
774 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
775#define params_rate(p) \
776 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
777#define params_period_size(p) \
778 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
779#define params_periods(p) \
780 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
781#define params_buffer_size(p) \
782 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
783#define params_buffer_bytes(p) \
784 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
785
786int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
787void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
788void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
789void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
790 unsigned int k, struct snd_interval *c);
791void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
792 const struct snd_interval *b, struct snd_interval *c);
793int snd_interval_list(struct snd_interval *i, unsigned int count,
794 const unsigned int *list, unsigned int mask);
795int snd_interval_ratnum(struct snd_interval *i,
796 unsigned int rats_count, struct snd_ratnum *rats,
797 unsigned int *nump, unsigned int *denp);
798
799void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
800void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
801int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
802
803int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
804
805int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
806int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
807
808int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
809 u_int32_t mask);
810int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
811 u_int64_t mask);
812int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
813 unsigned int min, unsigned int max);
814int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
815int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
816 unsigned int cond,
817 snd_pcm_hw_param_t var,
818 const struct snd_pcm_hw_constraint_list *l);
819int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
820 unsigned int cond,
821 snd_pcm_hw_param_t var,
822 struct snd_pcm_hw_constraint_ratnums *r);
823int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
824 unsigned int cond,
825 snd_pcm_hw_param_t var,
826 struct snd_pcm_hw_constraint_ratdens *r);
827int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
828 unsigned int cond,
829 unsigned int width,
830 unsigned int msbits);
831int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
832 unsigned int cond,
833 snd_pcm_hw_param_t var,
834 unsigned long step);
835int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
836 unsigned int cond,
837 snd_pcm_hw_param_t var);
838int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
839 unsigned int base_rate);
840int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
841 unsigned int cond,
842 int var,
843 snd_pcm_hw_rule_func_t func, void *private,
844 int dep, ...);
845
846int snd_pcm_format_signed(snd_pcm_format_t format);
847int snd_pcm_format_unsigned(snd_pcm_format_t format);
848int snd_pcm_format_linear(snd_pcm_format_t format);
849int snd_pcm_format_little_endian(snd_pcm_format_t format);
850int snd_pcm_format_big_endian(snd_pcm_format_t format);
851#if 0 /* just for DocBook */
852/**
853 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
854 * @format: the format to check
855 *
856 * Return: 1 if the given PCM format is CPU-endian, 0 if
857 * opposite, or a negative error code if endian not specified.
858 */
859int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
860#endif /* DocBook */
861#ifdef SNDRV_LITTLE_ENDIAN
862#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
863#else
864#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
865#endif
866int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
867int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
868ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
869const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
870int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
871snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
872
873void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
874 const struct snd_pcm_ops *ops);
875void snd_pcm_set_sync(struct snd_pcm_substream *substream);
876int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
877int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
878 unsigned int cmd, void *arg);
879int snd_pcm_update_state(struct snd_pcm_substream *substream,
880 struct snd_pcm_runtime *runtime);
881int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
882int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
883int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
884int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
885int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
886void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
887void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
888snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
889 const void __user *buf,
890 snd_pcm_uframes_t frames);
891snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
892 void __user *buf, snd_pcm_uframes_t frames);
893snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
894 void __user **bufs, snd_pcm_uframes_t frames);
895snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
896 void __user **bufs, snd_pcm_uframes_t frames);
897
898extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
899
900int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
901unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
902unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
903unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
904 unsigned int rates_b);
905
906static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
907 struct snd_dma_buffer *bufp)
908{
909 struct snd_pcm_runtime *runtime = substream->runtime;
910 if (bufp) {
911 runtime->dma_buffer_p = bufp;
912 runtime->dma_area = bufp->area;
913 runtime->dma_addr = bufp->addr;
914 runtime->dma_bytes = bufp->bytes;
915 } else {
916 runtime->dma_buffer_p = NULL;
917 runtime->dma_area = NULL;
918 runtime->dma_addr = 0;
919 runtime->dma_bytes = 0;
920 }
921}
922
923/*
924 * Timer interface
925 */
926
927void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
928void snd_pcm_timer_init(struct snd_pcm_substream *substream);
929void snd_pcm_timer_done(struct snd_pcm_substream *substream);
930
931static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
932 struct timespec *tv)
933{
934 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
935 ktime_get_ts(tv);
936 else
937 getnstimeofday(tv);
938}
939
940/*
941 * Memory
942 */
943
944int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
945int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
946int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
947 int type, struct device *data,
948 size_t size, size_t max);
949int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
950 int type, void *data,
951 size_t size, size_t max);
952int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
953int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
954
955int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
956 size_t size, gfp_t gfp_flags);
957int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
958struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
959 unsigned long offset);
960#if 0 /* for kernel-doc */
961/**
962 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
963 * @substream: the substream to allocate the buffer to
964 * @size: the requested buffer size, in bytes
965 *
966 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
967 * contiguous in kernel virtual space, but not in physical memory. Use this
968 * if the buffer is accessed by kernel code but not by device DMA.
969 *
970 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
971 * code.
972 */
973static int snd_pcm_lib_alloc_vmalloc_buffer
974 (struct snd_pcm_substream *substream, size_t size);
975/**
976 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
977 * @substream: the substream to allocate the buffer to
978 * @size: the requested buffer size, in bytes
979 *
980 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
981 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
982 *
983 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
984 * code.
985 */
986static int snd_pcm_lib_alloc_vmalloc_32_buffer
987 (struct snd_pcm_substream *substream, size_t size);
988#endif
989#define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
990 _snd_pcm_lib_alloc_vmalloc_buffer \
991 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
992#define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
993 _snd_pcm_lib_alloc_vmalloc_buffer \
994 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
995
996#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
997
998#ifdef CONFIG_SND_DMA_SGBUF
999/*
1000 * SG-buffer handling
1001 */
1002#define snd_pcm_substream_sgbuf(substream) \
1003 snd_pcm_get_dma_buf(substream)->private_data
1004
1005struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1006 unsigned long offset);
1007#else /* !SND_DMA_SGBUF */
1008/*
1009 * fake using a continuous buffer
1010 */
1011#define snd_pcm_sgbuf_ops_page NULL
1012#endif /* SND_DMA_SGBUF */
1013
1014static inline dma_addr_t
1015snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1016{
1017 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1018}
1019
1020static inline void *
1021snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1022{
1023 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1024}
1025
1026static inline unsigned int
1027snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1028 unsigned int ofs, unsigned int size)
1029{
1030 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1031}
1032
1033/* handle mmap counter - PCM mmap callback should handle this counter properly */
1034static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1035{
1036 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1037 atomic_inc(&substream->mmap_count);
1038}
1039
1040static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1041{
1042 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1043 atomic_dec(&substream->mmap_count);
1044}
1045
1046int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1047 struct vm_area_struct *area);
1048/* mmap for io-memory area */
1049#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1050#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1051int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1052#else
1053#define SNDRV_PCM_INFO_MMAP_IOMEM 0
1054#define snd_pcm_lib_mmap_iomem NULL
1055#endif
1056
1057#define snd_pcm_lib_mmap_vmalloc NULL
1058
1059static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1060{
1061 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1062}
1063
1064/*
1065 * Misc
1066 */
1067
1068#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1069 (IEC958_AES1_CON_ORIGINAL<<8)|\
1070 (IEC958_AES1_CON_PCM_CODER<<8)|\
1071 (IEC958_AES3_CON_FS_48000<<24))
1072
1073#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1074
1075const char *snd_pcm_format_name(snd_pcm_format_t format);
1076
1077/**
1078 * snd_pcm_stream_str - Get a string naming the direction of a stream
1079 * @substream: the pcm substream instance
1080 *
1081 * Return: A string naming the direction of the stream.
1082 */
1083static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1084{
1085 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1086 return "Playback";
1087 else
1088 return "Capture";
1089}
1090
1091/*
1092 * PCM channel-mapping control API
1093 */
1094/* array element of channel maps */
1095struct snd_pcm_chmap_elem {
1096 unsigned char channels;
1097 unsigned char map[15];
1098};
1099
1100/* channel map information; retrieved via snd_kcontrol_chip() */
1101struct snd_pcm_chmap {
1102 struct snd_pcm *pcm; /* assigned PCM instance */
1103 int stream; /* PLAYBACK or CAPTURE */
1104 struct snd_kcontrol *kctl;
1105 const struct snd_pcm_chmap_elem *chmap;
1106 unsigned int max_channels;
1107 unsigned int channel_mask; /* optional: active channels bitmask */
1108 void *private_data; /* optional: private data pointer */
1109};
1110
1111/* get the PCM substream assigned to the given chmap info */
1112static inline struct snd_pcm_substream *
1113snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1114{
1115 struct snd_pcm_substream *s;
1116 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1117 if (s->number == idx)
1118 return s;
1119 return NULL;
1120}
1121
1122/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1123extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1124/* Other world's standard channel maps (C/LFE prior to RL/RR) */
1125extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1126
1127/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1128#define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1129#define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1130#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1131
1132int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1133 const struct snd_pcm_chmap_elem *chmap,
1134 int max_channels,
1135 unsigned long private_value,
1136 struct snd_pcm_chmap **info_ret);
1137
1138/* Strong-typed conversion of pcm_format to bitwise */
1139static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1140{
1141 return 1ULL << (__force int) pcm_format;
1142}
1143
1144/* printk helpers */
1145#define pcm_err(pcm, fmt, args...) \
1146 dev_err((pcm)->card->dev, fmt, ##args)
1147#define pcm_warn(pcm, fmt, args...) \
1148 dev_warn((pcm)->card->dev, fmt, ##args)
1149#define pcm_dbg(pcm, fmt, args...) \
1150 dev_dbg((pcm)->card->dev, fmt, ##args)
1151
1152#endif /* __SOUND_PCM_H */