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[deliverable/linux.git] / include / sound / pcm.h
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_params.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_S8 (1ULL << SNDRV_PCM_FORMAT_S8)
140 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8)
141 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE)
142 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE)
143 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE)
144 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE)
145 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE)
146 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE)
147 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE)
148 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE)
149 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE)
150 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE)
151 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE)
152 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE)
153 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
154 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
155 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
156 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
157 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
158 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
159 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
160 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW)
161 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
162 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG)
163 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM)
164 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
165 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
166 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
167 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
168 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
169 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
170 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
171 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
172 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
173 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
174 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
175 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
176 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
177
178 #ifdef SNDRV_LITTLE_ENDIAN
179 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
180 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
181 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
182 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
183 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
184 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
185 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
186 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
187 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
188 #endif
189 #ifdef SNDRV_BIG_ENDIAN
190 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
191 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
192 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
193 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
194 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
195 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
196 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
197 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
198 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
199 #endif
200
201 struct snd_pcm_file {
202 struct snd_pcm_substream *substream;
203 int no_compat_mmap;
204 };
205
206 struct snd_pcm_hw_rule;
207 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
208 struct snd_pcm_hw_rule *rule);
209
210 struct snd_pcm_hw_rule {
211 unsigned int cond;
212 snd_pcm_hw_rule_func_t func;
213 int var;
214 int deps[4];
215 void *private;
216 };
217
218 struct snd_pcm_hw_constraints {
219 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
220 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
221 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
222 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
223 unsigned int rules_num;
224 unsigned int rules_all;
225 struct snd_pcm_hw_rule *rules;
226 };
227
228 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
229 snd_pcm_hw_param_t var)
230 {
231 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
232 }
233
234 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
235 snd_pcm_hw_param_t var)
236 {
237 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
238 }
239
240 struct snd_ratnum {
241 unsigned int num;
242 unsigned int den_min, den_max, den_step;
243 };
244
245 struct snd_ratden {
246 unsigned int num_min, num_max, num_step;
247 unsigned int den;
248 };
249
250 struct snd_pcm_hw_constraint_ratnums {
251 int nrats;
252 struct snd_ratnum *rats;
253 };
254
255 struct snd_pcm_hw_constraint_ratdens {
256 int nrats;
257 struct snd_ratden *rats;
258 };
259
260 struct snd_pcm_hw_constraint_list {
261 unsigned int count;
262 unsigned int *list;
263 unsigned int mask;
264 };
265
266 struct snd_pcm_hwptr_log;
267
268 struct snd_pcm_runtime {
269 /* -- Status -- */
270 struct snd_pcm_substream *trigger_master;
271 struct timespec trigger_tstamp; /* trigger timestamp */
272 int overrange;
273 snd_pcm_uframes_t avail_max;
274 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
275 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
276 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
277 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
278
279 /* -- HW params -- */
280 snd_pcm_access_t access; /* access mode */
281 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
282 snd_pcm_subformat_t subformat; /* subformat */
283 unsigned int rate; /* rate in Hz */
284 unsigned int channels; /* channels */
285 snd_pcm_uframes_t period_size; /* period size */
286 unsigned int periods; /* periods */
287 snd_pcm_uframes_t buffer_size; /* buffer size */
288 snd_pcm_uframes_t min_align; /* Min alignment for the format */
289 size_t byte_align;
290 unsigned int frame_bits;
291 unsigned int sample_bits;
292 unsigned int info;
293 unsigned int rate_num;
294 unsigned int rate_den;
295
296 /* -- SW params -- */
297 int tstamp_mode; /* mmap timestamp is updated */
298 unsigned int period_step;
299 snd_pcm_uframes_t start_threshold;
300 snd_pcm_uframes_t stop_threshold;
301 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
302 noise is nearest than this */
303 snd_pcm_uframes_t silence_size; /* Silence filling size */
304 snd_pcm_uframes_t boundary; /* pointers wrap point */
305
306 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
307 snd_pcm_uframes_t silence_filled; /* size filled with silence */
308
309 union snd_pcm_sync_id sync; /* hardware synchronization ID */
310
311 /* -- mmap -- */
312 struct snd_pcm_mmap_status *status;
313 struct snd_pcm_mmap_control *control;
314
315 /* -- locking / scheduling -- */
316 unsigned int twake: 1; /* do transfer (!poll) wakeup */
317 wait_queue_head_t sleep; /* poll sleep */
318 wait_queue_head_t tsleep; /* transfer sleep */
319 struct fasync_struct *fasync;
320
321 /* -- private section -- */
322 void *private_data;
323 void (*private_free)(struct snd_pcm_runtime *runtime);
324
325 /* -- hardware description -- */
326 struct snd_pcm_hardware hw;
327 struct snd_pcm_hw_constraints hw_constraints;
328
329 /* -- interrupt callbacks -- */
330 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
331 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
332
333 /* -- timer -- */
334 unsigned int timer_resolution; /* timer resolution */
335 int tstamp_type; /* timestamp type */
336
337 /* -- DMA -- */
338 unsigned char *dma_area; /* DMA area */
339 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
340 size_t dma_bytes; /* size of DMA area */
341
342 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
343
344 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
345 /* -- OSS things -- */
346 struct snd_pcm_oss_runtime oss;
347 #endif
348
349 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
350 struct snd_pcm_hwptr_log *hwptr_log;
351 #endif
352 };
353
354 struct snd_pcm_group { /* keep linked substreams */
355 spinlock_t lock;
356 struct list_head substreams;
357 int count;
358 };
359
360 struct pid;
361
362 struct snd_pcm_substream {
363 struct snd_pcm *pcm;
364 struct snd_pcm_str *pstr;
365 void *private_data; /* copied from pcm->private_data */
366 int number;
367 char name[32]; /* substream name */
368 int stream; /* stream (direction) */
369 struct pm_qos_request_list *latency_pm_qos_req; /* pm_qos request */
370 size_t buffer_bytes_max; /* limit ring buffer size */
371 struct snd_dma_buffer dma_buffer;
372 unsigned int dma_buf_id;
373 size_t dma_max;
374 /* -- hardware operations -- */
375 struct snd_pcm_ops *ops;
376 /* -- runtime information -- */
377 struct snd_pcm_runtime *runtime;
378 /* -- timer section -- */
379 struct snd_timer *timer; /* timer */
380 unsigned timer_running: 1; /* time is running */
381 /* -- next substream -- */
382 struct snd_pcm_substream *next;
383 /* -- linked substreams -- */
384 struct list_head link_list; /* linked list member */
385 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
386 struct snd_pcm_group *group; /* pointer to current group */
387 /* -- assigned files -- */
388 void *file;
389 int ref_count;
390 atomic_t mmap_count;
391 unsigned int f_flags;
392 void (*pcm_release)(struct snd_pcm_substream *);
393 struct pid *pid;
394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
395 /* -- OSS things -- */
396 struct snd_pcm_oss_substream oss;
397 #endif
398 #ifdef CONFIG_SND_VERBOSE_PROCFS
399 struct snd_info_entry *proc_root;
400 struct snd_info_entry *proc_info_entry;
401 struct snd_info_entry *proc_hw_params_entry;
402 struct snd_info_entry *proc_sw_params_entry;
403 struct snd_info_entry *proc_status_entry;
404 struct snd_info_entry *proc_prealloc_entry;
405 struct snd_info_entry *proc_prealloc_max_entry;
406 #endif
407 /* misc flags */
408 unsigned int hw_opened: 1;
409 };
410
411 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
412
413
414 struct snd_pcm_str {
415 int stream; /* stream (direction) */
416 struct snd_pcm *pcm;
417 /* -- substreams -- */
418 unsigned int substream_count;
419 unsigned int substream_opened;
420 struct snd_pcm_substream *substream;
421 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
422 /* -- OSS things -- */
423 struct snd_pcm_oss_stream oss;
424 #endif
425 #ifdef CONFIG_SND_VERBOSE_PROCFS
426 struct snd_info_entry *proc_root;
427 struct snd_info_entry *proc_info_entry;
428 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
429 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
430 struct snd_info_entry *proc_xrun_debug_entry;
431 #endif
432 #endif
433 };
434
435 struct snd_pcm {
436 struct snd_card *card;
437 struct list_head list;
438 int device; /* device number */
439 unsigned int info_flags;
440 unsigned short dev_class;
441 unsigned short dev_subclass;
442 char id[64];
443 char name[80];
444 struct snd_pcm_str streams[2];
445 struct mutex open_mutex;
446 wait_queue_head_t open_wait;
447 void *private_data;
448 void (*private_free) (struct snd_pcm *pcm);
449 struct device *dev; /* actual hw device this belongs to */
450 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
451 struct snd_pcm_oss oss;
452 #endif
453 };
454
455 struct snd_pcm_notify {
456 int (*n_register) (struct snd_pcm * pcm);
457 int (*n_disconnect) (struct snd_pcm * pcm);
458 int (*n_unregister) (struct snd_pcm * pcm);
459 struct list_head list;
460 };
461
462 /*
463 * Registering
464 */
465
466 extern const struct file_operations snd_pcm_f_ops[2];
467
468 int snd_pcm_new(struct snd_card *card, const char *id, int device,
469 int playback_count, int capture_count,
470 struct snd_pcm **rpcm);
471 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
472
473 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
474
475 /*
476 * Native I/O
477 */
478
479 extern rwlock_t snd_pcm_link_rwlock;
480
481 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
482 int snd_pcm_info_user(struct snd_pcm_substream *substream,
483 struct snd_pcm_info __user *info);
484 int snd_pcm_status(struct snd_pcm_substream *substream,
485 struct snd_pcm_status *status);
486 int snd_pcm_start(struct snd_pcm_substream *substream);
487 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
488 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
489 #ifdef CONFIG_PM
490 int snd_pcm_suspend(struct snd_pcm_substream *substream);
491 int snd_pcm_suspend_all(struct snd_pcm *pcm);
492 #endif
493 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
494 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
495 struct snd_pcm_substream **rsubstream);
496 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
497 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
498 struct snd_pcm_substream **rsubstream);
499 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
500 void snd_pcm_vma_notify_data(void *client, void *data);
501 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
502
503 /*
504 * PCM library
505 */
506
507 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
508 {
509 return substream->group != &substream->self_group;
510 }
511
512 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
513 {
514 read_lock(&snd_pcm_link_rwlock);
515 spin_lock(&substream->self_group.lock);
516 }
517
518 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
519 {
520 spin_unlock(&substream->self_group.lock);
521 read_unlock(&snd_pcm_link_rwlock);
522 }
523
524 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
525 {
526 read_lock_irq(&snd_pcm_link_rwlock);
527 spin_lock(&substream->self_group.lock);
528 }
529
530 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
531 {
532 spin_unlock(&substream->self_group.lock);
533 read_unlock_irq(&snd_pcm_link_rwlock);
534 }
535
536 #define snd_pcm_stream_lock_irqsave(substream, flags) \
537 do { \
538 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
539 spin_lock(&substream->self_group.lock); \
540 } while (0)
541
542 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
543 do { \
544 spin_unlock(&substream->self_group.lock); \
545 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
546 } while (0)
547
548 #define snd_pcm_group_for_each_entry(s, substream) \
549 list_for_each_entry(s, &substream->group->substreams, link_list)
550
551 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
552 {
553 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
554 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
555 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
556 }
557
558 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
559 {
560 return size * 8 / runtime->sample_bits;
561 }
562
563 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
564 {
565 return size * 8 / runtime->frame_bits;
566 }
567
568 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
569 {
570 return size * runtime->sample_bits / 8;
571 }
572
573 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
574 {
575 return size * runtime->frame_bits / 8;
576 }
577
578 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
579 {
580 return bytes % runtime->byte_align == 0;
581 }
582
583 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
584 {
585 struct snd_pcm_runtime *runtime = substream->runtime;
586 return frames_to_bytes(runtime, runtime->buffer_size);
587 }
588
589 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
590 {
591 struct snd_pcm_runtime *runtime = substream->runtime;
592 return frames_to_bytes(runtime, runtime->period_size);
593 }
594
595 /*
596 * result is: 0 ... (boundary - 1)
597 */
598 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
599 {
600 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
601 if (avail < 0)
602 avail += runtime->boundary;
603 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
604 avail -= runtime->boundary;
605 return avail;
606 }
607
608 /*
609 * result is: 0 ... (boundary - 1)
610 */
611 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
612 {
613 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
614 if (avail < 0)
615 avail += runtime->boundary;
616 return avail;
617 }
618
619 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
620 {
621 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
622 }
623
624 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
625 {
626 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
627 }
628
629 /**
630 * snd_pcm_playback_ready - check whether the playback buffer is available
631 * @substream: the pcm substream instance
632 *
633 * Checks whether enough free space is available on the playback buffer.
634 *
635 * Returns non-zero if available, or zero if not.
636 */
637 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
638 {
639 struct snd_pcm_runtime *runtime = substream->runtime;
640 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
641 }
642
643 /**
644 * snd_pcm_capture_ready - check whether the capture buffer is available
645 * @substream: the pcm substream instance
646 *
647 * Checks whether enough capture data is available on the capture buffer.
648 *
649 * Returns non-zero if available, or zero if not.
650 */
651 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
652 {
653 struct snd_pcm_runtime *runtime = substream->runtime;
654 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
655 }
656
657 /**
658 * snd_pcm_playback_data - check whether any data exists on the playback buffer
659 * @substream: the pcm substream instance
660 *
661 * Checks whether any data exists on the playback buffer. If stop_threshold
662 * is bigger or equal to boundary, then this function returns always non-zero.
663 *
664 * Returns non-zero if exists, or zero if not.
665 */
666 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
667 {
668 struct snd_pcm_runtime *runtime = substream->runtime;
669
670 if (runtime->stop_threshold >= runtime->boundary)
671 return 1;
672 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
673 }
674
675 /**
676 * snd_pcm_playback_empty - check whether the playback buffer is empty
677 * @substream: the pcm substream instance
678 *
679 * Checks whether the playback buffer is empty.
680 *
681 * Returns non-zero if empty, or zero if not.
682 */
683 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
684 {
685 struct snd_pcm_runtime *runtime = substream->runtime;
686 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
687 }
688
689 /**
690 * snd_pcm_capture_empty - check whether the capture buffer is empty
691 * @substream: the pcm substream instance
692 *
693 * Checks whether the capture buffer is empty.
694 *
695 * Returns non-zero if empty, or zero if not.
696 */
697 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
698 {
699 struct snd_pcm_runtime *runtime = substream->runtime;
700 return snd_pcm_capture_avail(runtime) == 0;
701 }
702
703 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
704 struct snd_pcm_substream *master)
705 {
706 substream->runtime->trigger_master = master;
707 }
708
709 static inline int hw_is_mask(int var)
710 {
711 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
712 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
713 }
714
715 static inline int hw_is_interval(int var)
716 {
717 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
718 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
719 }
720
721 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
722 snd_pcm_hw_param_t var)
723 {
724 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
725 }
726
727 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
728 snd_pcm_hw_param_t var)
729 {
730 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
731 }
732
733 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
734 snd_pcm_hw_param_t var)
735 {
736 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
737 }
738
739 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
740 snd_pcm_hw_param_t var)
741 {
742 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
743 }
744
745 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
746 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
747 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
748 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
749 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
750 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
751 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
752 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
753 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
754 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
755
756
757 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
758 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
759 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
760 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
761 unsigned int k, struct snd_interval *c);
762 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
763 const struct snd_interval *b, struct snd_interval *c);
764 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
765 int snd_interval_ratnum(struct snd_interval *i,
766 unsigned int rats_count, struct snd_ratnum *rats,
767 unsigned int *nump, unsigned int *denp);
768
769 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
770 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
771 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
772
773 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
774
775 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
776 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
777
778 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
779 u_int32_t mask);
780 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
781 u_int64_t mask);
782 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
783 unsigned int min, unsigned int max);
784 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
785 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
786 unsigned int cond,
787 snd_pcm_hw_param_t var,
788 struct snd_pcm_hw_constraint_list *l);
789 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
790 unsigned int cond,
791 snd_pcm_hw_param_t var,
792 struct snd_pcm_hw_constraint_ratnums *r);
793 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
794 unsigned int cond,
795 snd_pcm_hw_param_t var,
796 struct snd_pcm_hw_constraint_ratdens *r);
797 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
798 unsigned int cond,
799 unsigned int width,
800 unsigned int msbits);
801 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
802 unsigned int cond,
803 snd_pcm_hw_param_t var,
804 unsigned long step);
805 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
806 unsigned int cond,
807 snd_pcm_hw_param_t var);
808 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
809 unsigned int cond,
810 int var,
811 snd_pcm_hw_rule_func_t func, void *private,
812 int dep, ...);
813
814 int snd_pcm_format_signed(snd_pcm_format_t format);
815 int snd_pcm_format_unsigned(snd_pcm_format_t format);
816 int snd_pcm_format_linear(snd_pcm_format_t format);
817 int snd_pcm_format_little_endian(snd_pcm_format_t format);
818 int snd_pcm_format_big_endian(snd_pcm_format_t format);
819 #if 0 /* just for DocBook */
820 /**
821 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
822 * @format: the format to check
823 *
824 * Returns 1 if the given PCM format is CPU-endian, 0 if
825 * opposite, or a negative error code if endian not specified.
826 */
827 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
828 #endif /* DocBook */
829 #ifdef SNDRV_LITTLE_ENDIAN
830 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
831 #else
832 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
833 #endif
834 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
835 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
836 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
837 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
838 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
839 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
840
841 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
842 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
843 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
844 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
845 unsigned int cmd, void *arg);
846 int snd_pcm_update_state(struct snd_pcm_substream *substream,
847 struct snd_pcm_runtime *runtime);
848 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
849 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
850 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
851 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
852 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
853 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
854 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
855 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
856 const void __user *buf,
857 snd_pcm_uframes_t frames);
858 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
859 void __user *buf, snd_pcm_uframes_t frames);
860 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
861 void __user **bufs, snd_pcm_uframes_t frames);
862 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
863 void __user **bufs, snd_pcm_uframes_t frames);
864
865 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
866
867 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
868 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
869
870 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
871 struct snd_dma_buffer *bufp)
872 {
873 struct snd_pcm_runtime *runtime = substream->runtime;
874 if (bufp) {
875 runtime->dma_buffer_p = bufp;
876 runtime->dma_area = bufp->area;
877 runtime->dma_addr = bufp->addr;
878 runtime->dma_bytes = bufp->bytes;
879 } else {
880 runtime->dma_buffer_p = NULL;
881 runtime->dma_area = NULL;
882 runtime->dma_addr = 0;
883 runtime->dma_bytes = 0;
884 }
885 }
886
887 /*
888 * Timer interface
889 */
890
891 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
892 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
893 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
894
895 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
896 struct timespec *tv)
897 {
898 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
899 do_posix_clock_monotonic_gettime(tv);
900 else
901 getnstimeofday(tv);
902 }
903
904 /*
905 * Memory
906 */
907
908 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
909 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
910 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
911 int type, struct device *data,
912 size_t size, size_t max);
913 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
914 int type, void *data,
915 size_t size, size_t max);
916 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
917 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
918
919 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
920 size_t size, gfp_t gfp_flags);
921 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
922 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
923 unsigned long offset);
924 #if 0 /* for kernel-doc */
925 /**
926 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
927 * @substream: the substream to allocate the buffer to
928 * @size: the requested buffer size, in bytes
929 *
930 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
931 * contiguous in kernel virtual space, but not in physical memory. Use this
932 * if the buffer is accessed by kernel code but not by device DMA.
933 *
934 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
935 * code.
936 */
937 static int snd_pcm_lib_alloc_vmalloc_buffer
938 (struct snd_pcm_substream *substream, size_t size);
939 /**
940 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
941 * @substream: the substream to allocate the buffer to
942 * @size: the requested buffer size, in bytes
943 *
944 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
945 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
946 */
947 static int snd_pcm_lib_alloc_vmalloc_32_buffer
948 (struct snd_pcm_substream *substream, size_t size);
949 #endif
950 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
951 _snd_pcm_lib_alloc_vmalloc_buffer \
952 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
953 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
954 _snd_pcm_lib_alloc_vmalloc_buffer \
955 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
956
957 #ifdef CONFIG_SND_DMA_SGBUF
958 /*
959 * SG-buffer handling
960 */
961 #define snd_pcm_substream_sgbuf(substream) \
962 ((substream)->runtime->dma_buffer_p->private_data)
963
964 static inline dma_addr_t
965 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
966 {
967 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
968 return snd_sgbuf_get_addr(sg, ofs);
969 }
970
971 static inline void *
972 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
973 {
974 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
975 return snd_sgbuf_get_ptr(sg, ofs);
976 }
977
978 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
979 unsigned long offset);
980 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
981 unsigned int ofs, unsigned int size);
982
983 #else /* !SND_DMA_SGBUF */
984 /*
985 * fake using a continuous buffer
986 */
987 static inline dma_addr_t
988 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
989 {
990 return substream->runtime->dma_addr + ofs;
991 }
992
993 static inline void *
994 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
995 {
996 return substream->runtime->dma_area + ofs;
997 }
998
999 #define snd_pcm_sgbuf_ops_page NULL
1000
1001 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size)
1002
1003 #endif /* SND_DMA_SGBUF */
1004
1005 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1006 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1007 {
1008 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1009 atomic_inc(&substream->mmap_count);
1010 }
1011
1012 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1013 {
1014 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1015 atomic_dec(&substream->mmap_count);
1016 }
1017
1018 /* mmap for io-memory area */
1019 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1020 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1021 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1022 #else
1023 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1024 #define snd_pcm_lib_mmap_iomem NULL
1025 #endif
1026
1027 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
1028 struct vm_area_struct *area);
1029 #define snd_pcm_lib_mmap_vmalloc snd_pcm_lib_mmap_noncached
1030
1031 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1032 {
1033 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1034 }
1035
1036 /*
1037 * Misc
1038 */
1039
1040 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1041 (IEC958_AES1_CON_ORIGINAL<<8)|\
1042 (IEC958_AES1_CON_PCM_CODER<<8)|\
1043 (IEC958_AES3_CON_FS_48000<<24))
1044
1045 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1046
1047 const char *snd_pcm_format_name(snd_pcm_format_t format);
1048
1049 #endif /* __SOUND_PCM_H */
Linux kernel - Deliverables
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