5 * Digital Audio (PCM) abstract layer
6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7 * Abramo Bagnara <abramo@alsa-project.org>
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.
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.
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
26 #include <sound/asound.h>
27 #include <sound/memalloc.h>
28 #include <sound/minors.h>
29 #include <linux/poll.h>
31 #include <linux/bitops.h>
32 #include <linux/pm_qos.h>
34 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
35 #define snd_pcm_chip(pcm) ((pcm)->private_data)
37 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
38 #include <sound/pcm_oss.h>
42 * Hardware (lowlevel) section
45 struct 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 */
61 struct snd_pcm_substream;
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);
91 #if defined(CONFIG_SND_DYNAMIC_MINORS)
92 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
94 #define SNDRV_PCM_DEVICES 8
97 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0)
98 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1)
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
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
113 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
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 */
130 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
131 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
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 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
188 #ifdef SNDRV_LITTLE_ENDIAN
189 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
190 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
191 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
192 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
193 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
194 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
195 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
196 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
199 #ifdef SNDRV_BIG_ENDIAN
200 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
201 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
202 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
203 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
204 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
205 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
206 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
207 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
208 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
211 struct snd_pcm_file {
212 struct snd_pcm_substream *substream;
216 struct snd_pcm_hw_rule;
217 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
218 struct snd_pcm_hw_rule *rule);
220 struct snd_pcm_hw_rule {
222 snd_pcm_hw_rule_func_t func;
228 struct snd_pcm_hw_constraints {
229 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
230 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
231 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
232 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
233 unsigned int rules_num;
234 unsigned int rules_all;
235 struct snd_pcm_hw_rule *rules;
238 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
239 snd_pcm_hw_param_t var)
241 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
244 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
245 snd_pcm_hw_param_t var)
247 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
252 unsigned int den_min, den_max, den_step;
256 unsigned int num_min, num_max, num_step;
260 struct snd_pcm_hw_constraint_ratnums {
262 struct snd_ratnum *rats;
265 struct snd_pcm_hw_constraint_ratdens {
267 struct snd_ratden *rats;
270 struct snd_pcm_hw_constraint_list {
272 const unsigned int *list;
276 struct snd_pcm_hwptr_log;
278 struct snd_pcm_runtime {
280 struct snd_pcm_substream *trigger_master;
281 struct timespec trigger_tstamp; /* trigger timestamp */
283 snd_pcm_uframes_t avail_max;
284 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
285 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
286 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
287 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
288 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
289 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
291 /* -- HW params -- */
292 snd_pcm_access_t access; /* access mode */
293 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
294 snd_pcm_subformat_t subformat; /* subformat */
295 unsigned int rate; /* rate in Hz */
296 unsigned int channels; /* channels */
297 snd_pcm_uframes_t period_size; /* period size */
298 unsigned int periods; /* periods */
299 snd_pcm_uframes_t buffer_size; /* buffer size */
300 snd_pcm_uframes_t min_align; /* Min alignment for the format */
302 unsigned int frame_bits;
303 unsigned int sample_bits;
305 unsigned int rate_num;
306 unsigned int rate_den;
307 unsigned int no_period_wakeup: 1;
309 /* -- SW params -- */
310 int tstamp_mode; /* mmap timestamp is updated */
311 unsigned int period_step;
312 snd_pcm_uframes_t start_threshold;
313 snd_pcm_uframes_t stop_threshold;
314 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
315 noise is nearest than this */
316 snd_pcm_uframes_t silence_size; /* Silence filling size */
317 snd_pcm_uframes_t boundary; /* pointers wrap point */
319 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
320 snd_pcm_uframes_t silence_filled; /* size filled with silence */
322 union snd_pcm_sync_id sync; /* hardware synchronization ID */
325 struct snd_pcm_mmap_status *status;
326 struct snd_pcm_mmap_control *control;
328 /* -- locking / scheduling -- */
329 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
330 wait_queue_head_t sleep; /* poll sleep */
331 wait_queue_head_t tsleep; /* transfer sleep */
332 struct fasync_struct *fasync;
334 /* -- private section -- */
336 void (*private_free)(struct snd_pcm_runtime *runtime);
338 /* -- hardware description -- */
339 struct snd_pcm_hardware hw;
340 struct snd_pcm_hw_constraints hw_constraints;
342 /* -- interrupt callbacks -- */
343 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
344 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
347 unsigned int timer_resolution; /* timer resolution */
348 int tstamp_type; /* timestamp type */
351 unsigned char *dma_area; /* DMA area */
352 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
353 size_t dma_bytes; /* size of DMA area */
355 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
357 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
358 /* -- OSS things -- */
359 struct snd_pcm_oss_runtime oss;
362 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
363 struct snd_pcm_hwptr_log *hwptr_log;
367 struct snd_pcm_group { /* keep linked substreams */
370 struct list_head substreams;
376 struct snd_pcm_substream {
378 struct snd_pcm_str *pstr;
379 void *private_data; /* copied from pcm->private_data */
381 char name[32]; /* substream name */
382 int stream; /* stream (direction) */
383 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
384 size_t buffer_bytes_max; /* limit ring buffer size */
385 struct snd_dma_buffer dma_buffer;
387 /* -- hardware operations -- */
388 const struct snd_pcm_ops *ops;
389 /* -- runtime information -- */
390 struct snd_pcm_runtime *runtime;
391 /* -- timer section -- */
392 struct snd_timer *timer; /* timer */
393 unsigned timer_running: 1; /* time is running */
394 /* -- next substream -- */
395 struct snd_pcm_substream *next;
396 /* -- linked substreams -- */
397 struct list_head link_list; /* linked list member */
398 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
399 struct snd_pcm_group *group; /* pointer to current group */
400 /* -- assigned files -- */
404 unsigned int f_flags;
405 void (*pcm_release)(struct snd_pcm_substream *);
407 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
408 /* -- OSS things -- */
409 struct snd_pcm_oss_substream oss;
411 #ifdef CONFIG_SND_VERBOSE_PROCFS
412 struct snd_info_entry *proc_root;
413 struct snd_info_entry *proc_info_entry;
414 struct snd_info_entry *proc_hw_params_entry;
415 struct snd_info_entry *proc_sw_params_entry;
416 struct snd_info_entry *proc_status_entry;
417 struct snd_info_entry *proc_prealloc_entry;
418 struct snd_info_entry *proc_prealloc_max_entry;
419 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
420 struct snd_info_entry *proc_xrun_injection_entry;
422 #endif /* CONFIG_SND_VERBOSE_PROCFS */
424 unsigned int hw_opened: 1;
427 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
431 int stream; /* stream (direction) */
433 /* -- substreams -- */
434 unsigned int substream_count;
435 unsigned int substream_opened;
436 struct snd_pcm_substream *substream;
437 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
438 /* -- OSS things -- */
439 struct snd_pcm_oss_stream oss;
441 #ifdef CONFIG_SND_VERBOSE_PROCFS
442 struct snd_info_entry *proc_root;
443 struct snd_info_entry *proc_info_entry;
444 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
445 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
446 struct snd_info_entry *proc_xrun_debug_entry;
449 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
453 struct snd_card *card;
454 struct list_head list;
455 int device; /* device number */
456 unsigned int info_flags;
457 unsigned short dev_class;
458 unsigned short dev_subclass;
461 struct snd_pcm_str streams[2];
462 struct mutex open_mutex;
463 wait_queue_head_t open_wait;
465 void (*private_free) (struct snd_pcm *pcm);
466 struct device *dev; /* actual hw device this belongs to */
467 bool internal; /* pcm is for internal use only */
468 bool nonatomic; /* whole PCM operations are in non-atomic context */
469 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
470 struct snd_pcm_oss oss;
474 struct snd_pcm_notify {
475 int (*n_register) (struct snd_pcm * pcm);
476 int (*n_disconnect) (struct snd_pcm * pcm);
477 int (*n_unregister) (struct snd_pcm * pcm);
478 struct list_head list;
485 extern const struct file_operations snd_pcm_f_ops[2];
487 int snd_pcm_new(struct snd_card *card, const char *id, int device,
488 int playback_count, int capture_count,
489 struct snd_pcm **rpcm);
490 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
491 int playback_count, int capture_count,
492 struct snd_pcm **rpcm);
493 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
495 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
501 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
502 int snd_pcm_info_user(struct snd_pcm_substream *substream,
503 struct snd_pcm_info __user *info);
504 int snd_pcm_status(struct snd_pcm_substream *substream,
505 struct snd_pcm_status *status);
506 int snd_pcm_start(struct snd_pcm_substream *substream);
507 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
508 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
510 int snd_pcm_suspend(struct snd_pcm_substream *substream);
511 int snd_pcm_suspend_all(struct snd_pcm *pcm);
513 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
514 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
515 struct snd_pcm_substream **rsubstream);
516 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
517 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
518 struct snd_pcm_substream **rsubstream);
519 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
520 void snd_pcm_vma_notify_data(void *client, void *data);
521 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
524 #ifdef CONFIG_SND_DEBUG
525 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
526 char *name, size_t len);
529 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
540 * snd_pcm_stream_linked - Check whether the substream is linked with others
541 * @substream: substream to check
543 * Returns true if the given substream is being linked with others.
545 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
547 return substream->group != &substream->self_group;
550 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
551 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
552 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
553 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
554 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
557 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
558 * @substream: PCM substream
561 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
562 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
563 * as snd_pcm_stream_lock().
565 #define snd_pcm_stream_lock_irqsave(substream, flags) \
567 typecheck(unsigned long, flags); \
568 flags = _snd_pcm_stream_lock_irqsave(substream); \
570 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
571 unsigned long flags);
574 * snd_pcm_group_for_each_entry - iterate over the linked substreams
576 * @substream: the substream
578 * Iterate over the all linked substreams to the given @substream.
579 * When @substream isn't linked with any others, this gives returns @substream
582 #define snd_pcm_group_for_each_entry(s, substream) \
583 list_for_each_entry(s, &substream->group->substreams, link_list)
586 * snd_pcm_running - Check whether the substream is in a running state
587 * @substream: substream to check
589 * Returns true if the given substream is in the state RUNNING, or in the
590 * state DRAINING for playback.
592 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
594 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
595 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
596 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
600 * bytes_to_samples - Unit conversion of the size from bytes to samples
601 * @runtime: PCM runtime instance
602 * @size: size in bytes
604 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
606 return size * 8 / runtime->sample_bits;
610 * bytes_to_frames - Unit conversion of the size from bytes to frames
611 * @runtime: PCM runtime instance
612 * @size: size in bytes
614 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
616 return size * 8 / runtime->frame_bits;
620 * samples_to_bytes - Unit conversion of the size from samples to bytes
621 * @runtime: PCM runtime instance
622 * @size: size in samples
624 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
626 return size * runtime->sample_bits / 8;
630 * frames_to_bytes - Unit conversion of the size from frames to bytes
631 * @runtime: PCM runtime instance
632 * @size: size in frames
634 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
636 return size * runtime->frame_bits / 8;
640 * frame_aligned - Check whether the byte size is aligned to frames
641 * @runtime: PCM runtime instance
642 * @bytes: size in bytes
644 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
646 return bytes % runtime->byte_align == 0;
650 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
651 * @substream: PCM substream
653 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
655 struct snd_pcm_runtime *runtime = substream->runtime;
656 return frames_to_bytes(runtime, runtime->buffer_size);
660 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
661 * @substream: PCM substream
663 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
665 struct snd_pcm_runtime *runtime = substream->runtime;
666 return frames_to_bytes(runtime, runtime->period_size);
670 * snd_pcm_playback_avail - Get the available (writable) space for playback
671 * @runtime: PCM runtime instance
673 * Result is between 0 ... (boundary - 1)
675 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
677 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
679 avail += runtime->boundary;
680 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
681 avail -= runtime->boundary;
686 * snd_pcm_playback_avail - Get the available (readable) space for capture
687 * @runtime: PCM runtime instance
689 * Result is between 0 ... (boundary - 1)
691 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
693 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
695 avail += runtime->boundary;
700 * snd_pcm_playback_hw_avail - Get the queued space for playback
701 * @runtime: PCM runtime instance
703 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
705 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
709 * snd_pcm_capture_hw_avail - Get the free space for capture
710 * @runtime: PCM runtime instance
712 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
714 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
718 * snd_pcm_playback_ready - check whether the playback buffer is available
719 * @substream: the pcm substream instance
721 * Checks whether enough free space is available on the playback buffer.
723 * Return: Non-zero if available, or zero if not.
725 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
727 struct snd_pcm_runtime *runtime = substream->runtime;
728 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
732 * snd_pcm_capture_ready - check whether the capture buffer is available
733 * @substream: the pcm substream instance
735 * Checks whether enough capture data is available on the capture buffer.
737 * Return: Non-zero if available, or zero if not.
739 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
741 struct snd_pcm_runtime *runtime = substream->runtime;
742 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
746 * snd_pcm_playback_data - check whether any data exists on the playback buffer
747 * @substream: the pcm substream instance
749 * Checks whether any data exists on the playback buffer.
751 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
752 * is bigger or equal to boundary, then this function returns always non-zero.
754 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
756 struct snd_pcm_runtime *runtime = substream->runtime;
758 if (runtime->stop_threshold >= runtime->boundary)
760 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
764 * snd_pcm_playback_empty - check whether the playback buffer is empty
765 * @substream: the pcm substream instance
767 * Checks whether the playback buffer is empty.
769 * Return: Non-zero if empty, or zero if not.
771 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
773 struct snd_pcm_runtime *runtime = substream->runtime;
774 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
778 * snd_pcm_capture_empty - check whether the capture buffer is empty
779 * @substream: the pcm substream instance
781 * Checks whether the capture buffer is empty.
783 * Return: Non-zero if empty, or zero if not.
785 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
787 struct snd_pcm_runtime *runtime = substream->runtime;
788 return snd_pcm_capture_avail(runtime) == 0;
792 * snd_pcm_trigger_done - Mark the master substream
793 * @substream: the pcm substream instance
794 * @master: the linked master substream
796 * When multiple substreams of the same card are linked and the hardware
797 * supports the single-shot operation, the driver calls this in the loop
798 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
799 * Then most of trigger operations are performed only to the given master
802 * The trigger_master mark is cleared at timestamp updates at the end
803 * of trigger operations.
805 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
806 struct snd_pcm_substream *master)
808 substream->runtime->trigger_master = master;
811 static inline int hw_is_mask(int var)
813 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
814 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
817 static inline int hw_is_interval(int var)
819 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
820 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
823 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
824 snd_pcm_hw_param_t var)
826 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
829 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
830 snd_pcm_hw_param_t var)
832 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
835 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
836 snd_pcm_hw_param_t var)
838 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
841 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
842 snd_pcm_hw_param_t var)
844 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
848 * params_channels - Get the number of channels from the hw params
851 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
853 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
857 * params_channels - Get the sample rate from the hw params
860 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
862 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
866 * params_channels - Get the period size (in frames) from the hw params
869 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
871 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
875 * params_channels - Get the number of periods from the hw params
878 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
880 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
884 * params_channels - Get the buffer size (in frames) from the hw params
887 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
889 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
893 * params_channels - Get the buffer size (in bytes) from the hw params
896 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
898 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
901 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
902 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
903 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
904 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
905 unsigned int k, struct snd_interval *c);
906 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
907 const struct snd_interval *b, struct snd_interval *c);
908 int snd_interval_list(struct snd_interval *i, unsigned int count,
909 const unsigned int *list, unsigned int mask);
910 int snd_interval_ratnum(struct snd_interval *i,
911 unsigned int rats_count, struct snd_ratnum *rats,
912 unsigned int *nump, unsigned int *denp);
914 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
915 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
916 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
918 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
920 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
921 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
923 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
925 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
927 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
928 unsigned int min, unsigned int max);
929 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
930 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
932 snd_pcm_hw_param_t var,
933 const struct snd_pcm_hw_constraint_list *l);
934 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
936 snd_pcm_hw_param_t var,
937 struct snd_pcm_hw_constraint_ratnums *r);
938 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
940 snd_pcm_hw_param_t var,
941 struct snd_pcm_hw_constraint_ratdens *r);
942 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
945 unsigned int msbits);
946 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
948 snd_pcm_hw_param_t var,
950 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
952 snd_pcm_hw_param_t var);
953 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
954 unsigned int base_rate);
955 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
958 snd_pcm_hw_rule_func_t func, void *private,
961 int snd_pcm_format_signed(snd_pcm_format_t format);
962 int snd_pcm_format_unsigned(snd_pcm_format_t format);
963 int snd_pcm_format_linear(snd_pcm_format_t format);
964 int snd_pcm_format_little_endian(snd_pcm_format_t format);
965 int snd_pcm_format_big_endian(snd_pcm_format_t format);
966 #if 0 /* just for DocBook */
968 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
969 * @format: the format to check
971 * Return: 1 if the given PCM format is CPU-endian, 0 if
972 * opposite, or a negative error code if endian not specified.
974 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
976 #ifdef SNDRV_LITTLE_ENDIAN
977 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
979 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
981 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
982 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
983 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
984 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
985 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
986 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
988 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
989 const struct snd_pcm_ops *ops);
990 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
991 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
992 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
993 unsigned int cmd, void *arg);
994 int snd_pcm_update_state(struct snd_pcm_substream *substream,
995 struct snd_pcm_runtime *runtime);
996 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
997 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
998 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
999 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
1000 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
1001 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
1002 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1003 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
1004 const void __user *buf,
1005 snd_pcm_uframes_t frames);
1006 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
1007 void __user *buf, snd_pcm_uframes_t frames);
1008 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1009 void __user **bufs, snd_pcm_uframes_t frames);
1010 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1011 void __user **bufs, snd_pcm_uframes_t frames);
1013 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
1015 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1016 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1017 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1018 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1019 unsigned int rates_b);
1022 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1023 * @substream: PCM substream to set
1024 * @bufp: the buffer information, NULL to clear
1026 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1027 * Otherwise it clears the current buffer information.
1029 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1030 struct snd_dma_buffer *bufp)
1032 struct snd_pcm_runtime *runtime = substream->runtime;
1034 runtime->dma_buffer_p = bufp;
1035 runtime->dma_area = bufp->area;
1036 runtime->dma_addr = bufp->addr;
1037 runtime->dma_bytes = bufp->bytes;
1039 runtime->dma_buffer_p = NULL;
1040 runtime->dma_area = NULL;
1041 runtime->dma_addr = 0;
1042 runtime->dma_bytes = 0;
1050 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
1051 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
1052 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
1055 * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1056 * @runtime: PCM runtime instance
1057 * @tv: timespec to fill
1059 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1060 struct timespec *tv)
1062 switch (runtime->tstamp_type) {
1063 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1066 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1067 getrawmonotonic(tv);
1079 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1080 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1081 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1082 int type, struct device *data,
1083 size_t size, size_t max);
1084 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1085 int type, void *data,
1086 size_t size, size_t max);
1087 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1088 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1090 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1091 size_t size, gfp_t gfp_flags);
1092 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1093 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1094 unsigned long offset);
1096 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1097 * @substream: the substream to allocate the buffer to
1098 * @size: the requested buffer size, in bytes
1100 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1101 * contiguous in kernel virtual space, but not in physical memory. Use this
1102 * if the buffer is accessed by kernel code but not by device DMA.
1104 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1107 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1108 (struct snd_pcm_substream *substream, size_t size)
1110 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1111 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1115 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1116 * @substream: the substream to allocate the buffer to
1117 * @size: the requested buffer size, in bytes
1119 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1120 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1122 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1125 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1126 (struct snd_pcm_substream *substream, size_t size)
1128 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1129 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1132 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1134 #ifdef CONFIG_SND_DMA_SGBUF
1136 * SG-buffer handling
1138 #define snd_pcm_substream_sgbuf(substream) \
1139 snd_pcm_get_dma_buf(substream)->private_data
1141 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1142 unsigned long offset);
1143 #else /* !SND_DMA_SGBUF */
1145 * fake using a continuous buffer
1147 #define snd_pcm_sgbuf_ops_page NULL
1148 #endif /* SND_DMA_SGBUF */
1151 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1152 * @substream: PCM substream
1155 static inline dma_addr_t
1156 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1158 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1162 * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1163 * @substream: PCM substream
1166 static inline void *
1167 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1169 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1173 * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1174 * page from the given size
1175 * @substream: PCM substream
1177 * @size: byte size to examine
1179 static inline unsigned int
1180 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1181 unsigned int ofs, unsigned int size)
1183 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1187 * snd_pcm_mmap_data_open - increase the mmap counter
1190 * PCM mmap callback should handle this counter properly
1192 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1194 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1195 atomic_inc(&substream->mmap_count);
1199 * snd_pcm_mmap_data_close - decrease the mmap counter
1202 * PCM mmap callback should handle this counter properly
1204 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1206 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1207 atomic_dec(&substream->mmap_count);
1210 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1211 struct vm_area_struct *area);
1212 /* mmap for io-memory area */
1213 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1214 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1215 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1217 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1218 #define snd_pcm_lib_mmap_iomem NULL
1221 #define snd_pcm_lib_mmap_vmalloc NULL
1224 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1226 * @max: pointer to store the max size
1228 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1230 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1237 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1238 (IEC958_AES1_CON_ORIGINAL<<8)|\
1239 (IEC958_AES1_CON_PCM_CODER<<8)|\
1240 (IEC958_AES3_CON_FS_48000<<24))
1242 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1244 const char *snd_pcm_format_name(snd_pcm_format_t format);
1247 * snd_pcm_stream_str - Get a string naming the direction of a stream
1248 * @substream: the pcm substream instance
1250 * Return: A string naming the direction of the stream.
1252 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1254 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1261 * PCM channel-mapping control API
1263 /* array element of channel maps */
1264 struct snd_pcm_chmap_elem {
1265 unsigned char channels;
1266 unsigned char map[15];
1269 /* channel map information; retrieved via snd_kcontrol_chip() */
1270 struct snd_pcm_chmap {
1271 struct snd_pcm *pcm; /* assigned PCM instance */
1272 int stream; /* PLAYBACK or CAPTURE */
1273 struct snd_kcontrol *kctl;
1274 const struct snd_pcm_chmap_elem *chmap;
1275 unsigned int max_channels;
1276 unsigned int channel_mask; /* optional: active channels bitmask */
1277 void *private_data; /* optional: private data pointer */
1281 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1282 * @info: chmap information
1283 * @idx: the substream number index
1285 static inline struct snd_pcm_substream *
1286 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1288 struct snd_pcm_substream *s;
1289 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1290 if (s->number == idx)
1295 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1296 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1297 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1298 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1300 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1301 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1302 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1303 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1305 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1306 const struct snd_pcm_chmap_elem *chmap,
1308 unsigned long private_value,
1309 struct snd_pcm_chmap **info_ret);
1312 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1313 * @pcm_format: PCM format
1315 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1317 return 1ULL << (__force int) pcm_format;
1320 /* printk helpers */
1321 #define pcm_err(pcm, fmt, args...) \
1322 dev_err((pcm)->card->dev, fmt, ##args)
1323 #define pcm_warn(pcm, fmt, args...) \
1324 dev_warn((pcm)->card->dev, fmt, ##args)
1325 #define pcm_dbg(pcm, fmt, args...) \
1326 dev_dbg((pcm)->card->dev, fmt, ##args)
1328 #endif /* __SOUND_PCM_H */