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