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
;
421 unsigned int hw_opened
: 1;
424 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
428 int stream
; /* stream (direction) */
430 /* -- substreams -- */
431 unsigned int substream_count
;
432 unsigned int substream_opened
;
433 struct snd_pcm_substream
*substream
;
434 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
435 /* -- OSS things -- */
436 struct snd_pcm_oss_stream oss
;
438 #ifdef CONFIG_SND_VERBOSE_PROCFS
439 struct snd_info_entry
*proc_root
;
440 struct snd_info_entry
*proc_info_entry
;
441 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
442 unsigned int xrun_debug
; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
443 struct snd_info_entry
*proc_xrun_debug_entry
;
446 struct snd_kcontrol
*chmap_kctl
; /* channel-mapping controls */
450 struct snd_card
*card
;
451 struct list_head list
;
452 int device
; /* device number */
453 unsigned int info_flags
;
454 unsigned short dev_class
;
455 unsigned short dev_subclass
;
458 struct snd_pcm_str streams
[2];
459 struct mutex open_mutex
;
460 wait_queue_head_t open_wait
;
462 void (*private_free
) (struct snd_pcm
*pcm
);
463 struct device
*dev
; /* actual hw device this belongs to */
464 bool internal
; /* pcm is for internal use only */
465 bool nonatomic
; /* whole PCM operations are in non-atomic context */
466 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
467 struct snd_pcm_oss oss
;
471 struct snd_pcm_notify
{
472 int (*n_register
) (struct snd_pcm
* pcm
);
473 int (*n_disconnect
) (struct snd_pcm
* pcm
);
474 int (*n_unregister
) (struct snd_pcm
* pcm
);
475 struct list_head list
;
482 extern const struct file_operations snd_pcm_f_ops
[2];
484 int snd_pcm_new(struct snd_card
*card
, const char *id
, int device
,
485 int playback_count
, int capture_count
,
486 struct snd_pcm
**rpcm
);
487 int snd_pcm_new_internal(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_stream(struct snd_pcm
*pcm
, int stream
, int substream_count
);
492 int snd_pcm_notify(struct snd_pcm_notify
*notify
, int nfree
);
498 int snd_pcm_info(struct snd_pcm_substream
*substream
, struct snd_pcm_info
*info
);
499 int snd_pcm_info_user(struct snd_pcm_substream
*substream
,
500 struct snd_pcm_info __user
*info
);
501 int snd_pcm_status(struct snd_pcm_substream
*substream
,
502 struct snd_pcm_status
*status
);
503 int snd_pcm_start(struct snd_pcm_substream
*substream
);
504 int snd_pcm_stop(struct snd_pcm_substream
*substream
, snd_pcm_state_t status
);
505 int snd_pcm_drain_done(struct snd_pcm_substream
*substream
);
507 int snd_pcm_suspend(struct snd_pcm_substream
*substream
);
508 int snd_pcm_suspend_all(struct snd_pcm
*pcm
);
510 int snd_pcm_kernel_ioctl(struct snd_pcm_substream
*substream
, unsigned int cmd
, void *arg
);
511 int snd_pcm_open_substream(struct snd_pcm
*pcm
, int stream
, struct file
*file
,
512 struct snd_pcm_substream
**rsubstream
);
513 void snd_pcm_release_substream(struct snd_pcm_substream
*substream
);
514 int snd_pcm_attach_substream(struct snd_pcm
*pcm
, int stream
, struct file
*file
,
515 struct snd_pcm_substream
**rsubstream
);
516 void snd_pcm_detach_substream(struct snd_pcm_substream
*substream
);
517 void snd_pcm_vma_notify_data(void *client
, void *data
);
518 int snd_pcm_mmap_data(struct snd_pcm_substream
*substream
, struct file
*file
, struct vm_area_struct
*area
);
521 #ifdef CONFIG_SND_DEBUG
522 void snd_pcm_debug_name(struct snd_pcm_substream
*substream
,
523 char *name
, size_t len
);
526 snd_pcm_debug_name(struct snd_pcm_substream
*substream
, char *buf
, size_t size
)
536 static inline int snd_pcm_stream_linked(struct snd_pcm_substream
*substream
)
538 return substream
->group
!= &substream
->self_group
;
541 void snd_pcm_stream_lock(struct snd_pcm_substream
*substream
);
542 void snd_pcm_stream_unlock(struct snd_pcm_substream
*substream
);
543 void snd_pcm_stream_lock_irq(struct snd_pcm_substream
*substream
);
544 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream
*substream
);
545 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream
*substream
);
546 #define snd_pcm_stream_lock_irqsave(substream, flags) \
548 typecheck(unsigned long, flags); \
549 flags = _snd_pcm_stream_lock_irqsave(substream); \
551 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream
*substream
,
552 unsigned long flags
);
554 #define snd_pcm_group_for_each_entry(s, substream) \
555 list_for_each_entry(s, &substream->group->substreams, link_list)
557 static inline int snd_pcm_running(struct snd_pcm_substream
*substream
)
559 return (substream
->runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
||
560 (substream
->runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
&&
561 substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
));
564 static inline ssize_t
bytes_to_samples(struct snd_pcm_runtime
*runtime
, ssize_t size
)
566 return size
* 8 / runtime
->sample_bits
;
569 static inline snd_pcm_sframes_t
bytes_to_frames(struct snd_pcm_runtime
*runtime
, ssize_t size
)
571 return size
* 8 / runtime
->frame_bits
;
574 static inline ssize_t
samples_to_bytes(struct snd_pcm_runtime
*runtime
, ssize_t size
)
576 return size
* runtime
->sample_bits
/ 8;
579 static inline ssize_t
frames_to_bytes(struct snd_pcm_runtime
*runtime
, snd_pcm_sframes_t size
)
581 return size
* runtime
->frame_bits
/ 8;
584 static inline int frame_aligned(struct snd_pcm_runtime
*runtime
, ssize_t bytes
)
586 return bytes
% runtime
->byte_align
== 0;
589 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream
*substream
)
591 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
592 return frames_to_bytes(runtime
, runtime
->buffer_size
);
595 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream
*substream
)
597 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
598 return frames_to_bytes(runtime
, runtime
->period_size
);
602 * result is: 0 ... (boundary - 1)
604 static inline snd_pcm_uframes_t
snd_pcm_playback_avail(struct snd_pcm_runtime
*runtime
)
606 snd_pcm_sframes_t avail
= runtime
->status
->hw_ptr
+ runtime
->buffer_size
- runtime
->control
->appl_ptr
;
608 avail
+= runtime
->boundary
;
609 else if ((snd_pcm_uframes_t
) avail
>= runtime
->boundary
)
610 avail
-= runtime
->boundary
;
615 * result is: 0 ... (boundary - 1)
617 static inline snd_pcm_uframes_t
snd_pcm_capture_avail(struct snd_pcm_runtime
*runtime
)
619 snd_pcm_sframes_t avail
= runtime
->status
->hw_ptr
- runtime
->control
->appl_ptr
;
621 avail
+= runtime
->boundary
;
625 static inline snd_pcm_sframes_t
snd_pcm_playback_hw_avail(struct snd_pcm_runtime
*runtime
)
627 return runtime
->buffer_size
- snd_pcm_playback_avail(runtime
);
630 static inline snd_pcm_sframes_t
snd_pcm_capture_hw_avail(struct snd_pcm_runtime
*runtime
)
632 return runtime
->buffer_size
- snd_pcm_capture_avail(runtime
);
636 * snd_pcm_playback_ready - check whether the playback buffer is available
637 * @substream: the pcm substream instance
639 * Checks whether enough free space is available on the playback buffer.
641 * Return: Non-zero if available, or zero if not.
643 static inline int snd_pcm_playback_ready(struct snd_pcm_substream
*substream
)
645 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
646 return snd_pcm_playback_avail(runtime
) >= runtime
->control
->avail_min
;
650 * snd_pcm_capture_ready - check whether the capture buffer is available
651 * @substream: the pcm substream instance
653 * Checks whether enough capture data is available on the capture buffer.
655 * Return: Non-zero if available, or zero if not.
657 static inline int snd_pcm_capture_ready(struct snd_pcm_substream
*substream
)
659 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
660 return snd_pcm_capture_avail(runtime
) >= runtime
->control
->avail_min
;
664 * snd_pcm_playback_data - check whether any data exists on the playback buffer
665 * @substream: the pcm substream instance
667 * Checks whether any data exists on the playback buffer.
669 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
670 * is bigger or equal to boundary, then this function returns always non-zero.
672 static inline int snd_pcm_playback_data(struct snd_pcm_substream
*substream
)
674 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
676 if (runtime
->stop_threshold
>= runtime
->boundary
)
678 return snd_pcm_playback_avail(runtime
) < runtime
->buffer_size
;
682 * snd_pcm_playback_empty - check whether the playback buffer is empty
683 * @substream: the pcm substream instance
685 * Checks whether the playback buffer is empty.
687 * Return: Non-zero if empty, or zero if not.
689 static inline int snd_pcm_playback_empty(struct snd_pcm_substream
*substream
)
691 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
692 return snd_pcm_playback_avail(runtime
) >= runtime
->buffer_size
;
696 * snd_pcm_capture_empty - check whether the capture buffer is empty
697 * @substream: the pcm substream instance
699 * Checks whether the capture buffer is empty.
701 * Return: Non-zero if empty, or zero if not.
703 static inline int snd_pcm_capture_empty(struct snd_pcm_substream
*substream
)
705 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
706 return snd_pcm_capture_avail(runtime
) == 0;
709 static inline void snd_pcm_trigger_done(struct snd_pcm_substream
*substream
,
710 struct snd_pcm_substream
*master
)
712 substream
->runtime
->trigger_master
= master
;
715 static inline int hw_is_mask(int var
)
717 return var
>= SNDRV_PCM_HW_PARAM_FIRST_MASK
&&
718 var
<= SNDRV_PCM_HW_PARAM_LAST_MASK
;
721 static inline int hw_is_interval(int var
)
723 return var
>= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
&&
724 var
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
;
727 static inline struct snd_mask
*hw_param_mask(struct snd_pcm_hw_params
*params
,
728 snd_pcm_hw_param_t var
)
730 return ¶ms
->masks
[var
- SNDRV_PCM_HW_PARAM_FIRST_MASK
];
733 static inline struct snd_interval
*hw_param_interval(struct snd_pcm_hw_params
*params
,
734 snd_pcm_hw_param_t var
)
736 return ¶ms
->intervals
[var
- SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
];
739 static inline const struct snd_mask
*hw_param_mask_c(const struct snd_pcm_hw_params
*params
,
740 snd_pcm_hw_param_t var
)
742 return ¶ms
->masks
[var
- SNDRV_PCM_HW_PARAM_FIRST_MASK
];
745 static inline const struct snd_interval
*hw_param_interval_c(const struct snd_pcm_hw_params
*params
,
746 snd_pcm_hw_param_t var
)
748 return ¶ms
->intervals
[var
- SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
];
751 #define params_channels(p) \
752 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
753 #define params_rate(p) \
754 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
755 #define params_period_size(p) \
756 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
757 #define params_periods(p) \
758 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
759 #define params_buffer_size(p) \
760 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
761 #define params_buffer_bytes(p) \
762 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
764 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
);
765 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
);
766 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
);
767 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
768 unsigned int k
, struct snd_interval
*c
);
769 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
770 const struct snd_interval
*b
, struct snd_interval
*c
);
771 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
772 const unsigned int *list
, unsigned int mask
);
773 int snd_interval_ratnum(struct snd_interval
*i
,
774 unsigned int rats_count
, struct snd_ratnum
*rats
,
775 unsigned int *nump
, unsigned int *denp
);
777 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
);
778 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
, snd_pcm_hw_param_t var
);
779 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*substream
, struct snd_pcm_hw_params
*params
);
781 int snd_pcm_hw_refine(struct snd_pcm_substream
*substream
, struct snd_pcm_hw_params
*params
);
783 int snd_pcm_hw_constraints_init(struct snd_pcm_substream
*substream
);
784 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream
*substream
);
786 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
788 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
790 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
791 unsigned int min
, unsigned int max
);
792 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
);
793 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
795 snd_pcm_hw_param_t var
,
796 const struct snd_pcm_hw_constraint_list
*l
);
797 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
799 snd_pcm_hw_param_t var
,
800 struct snd_pcm_hw_constraint_ratnums
*r
);
801 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
803 snd_pcm_hw_param_t var
,
804 struct snd_pcm_hw_constraint_ratdens
*r
);
805 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
808 unsigned int msbits
);
809 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
811 snd_pcm_hw_param_t var
,
813 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
815 snd_pcm_hw_param_t var
);
816 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
817 unsigned int base_rate
);
818 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
,
821 snd_pcm_hw_rule_func_t func
, void *private,
824 int snd_pcm_format_signed(snd_pcm_format_t format
);
825 int snd_pcm_format_unsigned(snd_pcm_format_t format
);
826 int snd_pcm_format_linear(snd_pcm_format_t format
);
827 int snd_pcm_format_little_endian(snd_pcm_format_t format
);
828 int snd_pcm_format_big_endian(snd_pcm_format_t format
);
829 #if 0 /* just for DocBook */
831 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
832 * @format: the format to check
834 * Return: 1 if the given PCM format is CPU-endian, 0 if
835 * opposite, or a negative error code if endian not specified.
837 int snd_pcm_format_cpu_endian(snd_pcm_format_t format
);
839 #ifdef SNDRV_LITTLE_ENDIAN
840 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
842 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
844 int snd_pcm_format_width(snd_pcm_format_t format
); /* in bits */
845 int snd_pcm_format_physical_width(snd_pcm_format_t format
); /* in bits */
846 ssize_t
snd_pcm_format_size(snd_pcm_format_t format
, size_t samples
);
847 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format
);
848 int snd_pcm_format_set_silence(snd_pcm_format_t format
, void *buf
, unsigned int frames
);
849 snd_pcm_format_t
snd_pcm_build_linear_format(int width
, int unsigned, int big_endian
);
851 void snd_pcm_set_ops(struct snd_pcm
* pcm
, int direction
,
852 const struct snd_pcm_ops
*ops
);
853 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
);
854 int snd_pcm_lib_interleave_len(struct snd_pcm_substream
*substream
);
855 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
856 unsigned int cmd
, void *arg
);
857 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
858 struct snd_pcm_runtime
*runtime
);
859 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
);
860 int snd_pcm_playback_xrun_check(struct snd_pcm_substream
*substream
);
861 int snd_pcm_capture_xrun_check(struct snd_pcm_substream
*substream
);
862 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream
*substream
);
863 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream
*substream
);
864 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
);
865 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
);
866 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
,
867 const void __user
*buf
,
868 snd_pcm_uframes_t frames
);
869 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
,
870 void __user
*buf
, snd_pcm_uframes_t frames
);
871 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
872 void __user
**bufs
, snd_pcm_uframes_t frames
);
873 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
874 void __user
**bufs
, snd_pcm_uframes_t frames
);
876 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates
;
878 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime
*runtime
);
879 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate
);
880 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit
);
881 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a
,
882 unsigned int rates_b
);
884 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream
*substream
,
885 struct snd_dma_buffer
*bufp
)
887 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
889 runtime
->dma_buffer_p
= bufp
;
890 runtime
->dma_area
= bufp
->area
;
891 runtime
->dma_addr
= bufp
->addr
;
892 runtime
->dma_bytes
= bufp
->bytes
;
894 runtime
->dma_buffer_p
= NULL
;
895 runtime
->dma_area
= NULL
;
896 runtime
->dma_addr
= 0;
897 runtime
->dma_bytes
= 0;
905 void snd_pcm_timer_resolution_change(struct snd_pcm_substream
*substream
);
906 void snd_pcm_timer_init(struct snd_pcm_substream
*substream
);
907 void snd_pcm_timer_done(struct snd_pcm_substream
*substream
);
909 static inline void snd_pcm_gettime(struct snd_pcm_runtime
*runtime
,
912 switch (runtime
->tstamp_type
) {
913 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC
:
916 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW
:
929 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream
*substream
);
930 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm
*pcm
);
931 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream
*substream
,
932 int type
, struct device
*data
,
933 size_t size
, size_t max
);
934 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm
*pcm
,
935 int type
, void *data
,
936 size_t size
, size_t max
);
937 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream
*substream
, size_t size
);
938 int snd_pcm_lib_free_pages(struct snd_pcm_substream
*substream
);
940 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream
*substream
,
941 size_t size
, gfp_t gfp_flags
);
942 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream
*substream
);
943 struct page
*snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream
*substream
,
944 unsigned long offset
);
945 #if 0 /* for kernel-doc */
947 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
948 * @substream: the substream to allocate the buffer to
949 * @size: the requested buffer size, in bytes
951 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
952 * contiguous in kernel virtual space, but not in physical memory. Use this
953 * if the buffer is accessed by kernel code but not by device DMA.
955 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
958 static int snd_pcm_lib_alloc_vmalloc_buffer
959 (struct snd_pcm_substream
*substream
, size_t size
);
961 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
962 * @substream: the substream to allocate the buffer to
963 * @size: the requested buffer size, in bytes
965 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
966 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
968 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
971 static int snd_pcm_lib_alloc_vmalloc_32_buffer
972 (struct snd_pcm_substream
*substream
, size_t size
);
974 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
975 _snd_pcm_lib_alloc_vmalloc_buffer \
976 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
977 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
978 _snd_pcm_lib_alloc_vmalloc_buffer \
979 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
981 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
983 #ifdef CONFIG_SND_DMA_SGBUF
987 #define snd_pcm_substream_sgbuf(substream) \
988 snd_pcm_get_dma_buf(substream)->private_data
990 struct page
*snd_pcm_sgbuf_ops_page(struct snd_pcm_substream
*substream
,
991 unsigned long offset
);
992 #else /* !SND_DMA_SGBUF */
994 * fake using a continuous buffer
996 #define snd_pcm_sgbuf_ops_page NULL
997 #endif /* SND_DMA_SGBUF */
999 static inline dma_addr_t
1000 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream
*substream
, unsigned int ofs
)
1002 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream
), ofs
);
1005 static inline void *
1006 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream
*substream
, unsigned int ofs
)
1008 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream
), ofs
);
1011 static inline unsigned int
1012 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream
*substream
,
1013 unsigned int ofs
, unsigned int size
)
1015 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream
), ofs
, size
);
1018 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1019 static inline void snd_pcm_mmap_data_open(struct vm_area_struct
*area
)
1021 struct snd_pcm_substream
*substream
= (struct snd_pcm_substream
*)area
->vm_private_data
;
1022 atomic_inc(&substream
->mmap_count
);
1025 static inline void snd_pcm_mmap_data_close(struct vm_area_struct
*area
)
1027 struct snd_pcm_substream
*substream
= (struct snd_pcm_substream
*)area
->vm_private_data
;
1028 atomic_dec(&substream
->mmap_count
);
1031 int snd_pcm_lib_default_mmap(struct snd_pcm_substream
*substream
,
1032 struct vm_area_struct
*area
);
1033 /* mmap for io-memory area */
1034 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1035 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1036 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream
*substream
, struct vm_area_struct
*area
);
1038 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1039 #define snd_pcm_lib_mmap_iomem NULL
1042 #define snd_pcm_lib_mmap_vmalloc NULL
1044 static inline void snd_pcm_limit_isa_dma_size(int dma
, size_t *max
)
1046 *max
= dma
< 4 ? 64 * 1024 : 128 * 1024;
1053 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1054 (IEC958_AES1_CON_ORIGINAL<<8)|\
1055 (IEC958_AES1_CON_PCM_CODER<<8)|\
1056 (IEC958_AES3_CON_FS_48000<<24))
1058 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1060 const char *snd_pcm_format_name(snd_pcm_format_t format
);
1063 * snd_pcm_stream_str - Get a string naming the direction of a stream
1064 * @substream: the pcm substream instance
1066 * Return: A string naming the direction of the stream.
1068 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream
*substream
)
1070 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
1077 * PCM channel-mapping control API
1079 /* array element of channel maps */
1080 struct snd_pcm_chmap_elem
{
1081 unsigned char channels
;
1082 unsigned char map
[15];
1085 /* channel map information; retrieved via snd_kcontrol_chip() */
1086 struct snd_pcm_chmap
{
1087 struct snd_pcm
*pcm
; /* assigned PCM instance */
1088 int stream
; /* PLAYBACK or CAPTURE */
1089 struct snd_kcontrol
*kctl
;
1090 const struct snd_pcm_chmap_elem
*chmap
;
1091 unsigned int max_channels
;
1092 unsigned int channel_mask
; /* optional: active channels bitmask */
1093 void *private_data
; /* optional: private data pointer */
1096 /* get the PCM substream assigned to the given chmap info */
1097 static inline struct snd_pcm_substream
*
1098 snd_pcm_chmap_substream(struct snd_pcm_chmap
*info
, unsigned int idx
)
1100 struct snd_pcm_substream
*s
;
1101 for (s
= info
->pcm
->streams
[info
->stream
].substream
; s
; s
= s
->next
)
1102 if (s
->number
== idx
)
1107 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1108 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps
[];
1109 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1110 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps
[];
1112 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1113 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1114 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1115 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1117 int snd_pcm_add_chmap_ctls(struct snd_pcm
*pcm
, int stream
,
1118 const struct snd_pcm_chmap_elem
*chmap
,
1120 unsigned long private_value
,
1121 struct snd_pcm_chmap
**info_ret
);
1123 /* Strong-typed conversion of pcm_format to bitwise */
1124 static inline u64
pcm_format_to_bits(snd_pcm_format_t pcm_format
)
1126 return 1ULL << (__force
int) pcm_format
;
1129 /* printk helpers */
1130 #define pcm_err(pcm, fmt, args...) \
1131 dev_err((pcm)->card->dev, fmt, ##args)
1132 #define pcm_warn(pcm, fmt, args...) \
1133 dev_warn((pcm)->card->dev, fmt, ##args)
1134 #define pcm_dbg(pcm, fmt, args...) \
1135 dev_dbg((pcm)->card->dev, fmt, ##args)
1137 #endif /* __SOUND_PCM_H */