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ALSA: pcm - Call pgprot_noncached() for vmalloc'ed buffers
[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
33 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
34 #define snd_pcm_chip(pcm) ((pcm)->private_data)
35
36 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
37 #include "pcm_oss.h"
38 #endif
39
40 /*
41 * Hardware (lowlevel) section
42 */
43
44 struct snd_pcm_hardware {
45 unsigned int info; /* SNDRV_PCM_INFO_* */
46 u64 formats; /* SNDRV_PCM_FMTBIT_* */
47 unsigned int rates; /* SNDRV_PCM_RATE_* */
48 unsigned int rate_min; /* min rate */
49 unsigned int rate_max; /* max rate */
50 unsigned int channels_min; /* min channels */
51 unsigned int channels_max; /* max channels */
52 size_t buffer_bytes_max; /* max buffer size */
53 size_t period_bytes_min; /* min period size */
54 size_t period_bytes_max; /* max period size */
55 unsigned int periods_min; /* min # of periods */
56 unsigned int periods_max; /* max # of periods */
57 size_t fifo_size; /* fifo size in bytes */
58 };
59
60 struct snd_pcm_substream;
61
62 struct snd_pcm_ops {
63 int (*open)(struct snd_pcm_substream *substream);
64 int (*close)(struct snd_pcm_substream *substream);
65 int (*ioctl)(struct snd_pcm_substream * substream,
66 unsigned int cmd, void *arg);
67 int (*hw_params)(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params *params);
69 int (*hw_free)(struct snd_pcm_substream *substream);
70 int (*prepare)(struct snd_pcm_substream *substream);
71 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
72 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
73 int (*copy)(struct snd_pcm_substream *substream, int channel,
74 snd_pcm_uframes_t pos,
75 void __user *buf, snd_pcm_uframes_t count);
76 int (*silence)(struct snd_pcm_substream *substream, int channel,
77 snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
78 struct page *(*page)(struct snd_pcm_substream *substream,
79 unsigned long offset);
80 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
81 int (*ack)(struct snd_pcm_substream *substream);
82 };
83
84 /*
85 *
86 */
87
88 #if defined(CONFIG_SND_DYNAMIC_MINORS)
89 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
90 #else
91 #define SNDRV_PCM_DEVICES 8
92 #endif
93
94 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0)
95 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1)
96
97 #define SNDRV_PCM_IOCTL1_RESET 0
98 #define SNDRV_PCM_IOCTL1_INFO 1
99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
100 #define SNDRV_PCM_IOCTL1_GSTATE 3
101 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
102
103 #define SNDRV_PCM_TRIGGER_STOP 0
104 #define SNDRV_PCM_TRIGGER_START 1
105 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
106 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
107 #define SNDRV_PCM_TRIGGER_SUSPEND 5
108 #define SNDRV_PCM_TRIGGER_RESUME 6
109
110 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
111
112 /* If you change this don't forget to change rates[] table in pcm_native.c */
113 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
114 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
115 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
116 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
117 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
118 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
119 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
120 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
121 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
122 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
123 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
124 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
125 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
126
127 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
128 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
129
130 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
131 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
132 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
133 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
134 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
135 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
136 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
137 SNDRV_PCM_RATE_192000)
138 #define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8)
139 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8)
140 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE)
141 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE)
142 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE)
143 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE)
144 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE)
145 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE)
146 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE)
147 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE)
148 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE)
149 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE)
150 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE)
151 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE)
152 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
153 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
154 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
155 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
157 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
158 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
159 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW)
160 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
161 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG)
162 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM)
163 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
164 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
165 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
166 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
167 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
168 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
169 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
170 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
171 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
172 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
173 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
174 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
175 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
176
177 #ifdef SNDRV_LITTLE_ENDIAN
178 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
179 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
180 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
181 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
182 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
183 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
184 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
185 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
186 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
187 #endif
188 #ifdef SNDRV_BIG_ENDIAN
189 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
190 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
191 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
192 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
193 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
194 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
195 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
196 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
198 #endif
199
200 struct snd_pcm_file {
201 struct snd_pcm_substream *substream;
202 int no_compat_mmap;
203 };
204
205 struct snd_pcm_hw_rule;
206 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
207 struct snd_pcm_hw_rule *rule);
208
209 struct snd_pcm_hw_rule {
210 unsigned int cond;
211 snd_pcm_hw_rule_func_t func;
212 int var;
213 int deps[4];
214 void *private;
215 };
216
217 struct snd_pcm_hw_constraints {
218 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
219 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
220 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
221 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
222 unsigned int rules_num;
223 unsigned int rules_all;
224 struct snd_pcm_hw_rule *rules;
225 };
226
227 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
228 snd_pcm_hw_param_t var)
229 {
230 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
231 }
232
233 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
234 snd_pcm_hw_param_t var)
235 {
236 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
237 }
238
239 struct snd_ratnum {
240 unsigned int num;
241 unsigned int den_min, den_max, den_step;
242 };
243
244 struct snd_ratden {
245 unsigned int num_min, num_max, num_step;
246 unsigned int den;
247 };
248
249 struct snd_pcm_hw_constraint_ratnums {
250 int nrats;
251 struct snd_ratnum *rats;
252 };
253
254 struct snd_pcm_hw_constraint_ratdens {
255 int nrats;
256 struct snd_ratden *rats;
257 };
258
259 struct snd_pcm_hw_constraint_list {
260 unsigned int count;
261 unsigned int *list;
262 unsigned int mask;
263 };
264
265 struct snd_pcm_hwptr_log;
266
267 struct snd_pcm_runtime {
268 /* -- Status -- */
269 struct snd_pcm_substream *trigger_master;
270 struct timespec trigger_tstamp; /* trigger timestamp */
271 int overrange;
272 snd_pcm_uframes_t avail_max;
273 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
274 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
275 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
276
277 /* -- HW params -- */
278 snd_pcm_access_t access; /* access mode */
279 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
280 snd_pcm_subformat_t subformat; /* subformat */
281 unsigned int rate; /* rate in Hz */
282 unsigned int channels; /* channels */
283 snd_pcm_uframes_t period_size; /* period size */
284 unsigned int periods; /* periods */
285 snd_pcm_uframes_t buffer_size; /* buffer size */
286 snd_pcm_uframes_t min_align; /* Min alignment for the format */
287 size_t byte_align;
288 unsigned int frame_bits;
289 unsigned int sample_bits;
290 unsigned int info;
291 unsigned int rate_num;
292 unsigned int rate_den;
293
294 /* -- SW params -- */
295 int tstamp_mode; /* mmap timestamp is updated */
296 unsigned int period_step;
297 snd_pcm_uframes_t start_threshold;
298 snd_pcm_uframes_t stop_threshold;
299 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
300 noise is nearest than this */
301 snd_pcm_uframes_t silence_size; /* Silence filling size */
302 snd_pcm_uframes_t boundary; /* pointers wrap point */
303
304 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
305 snd_pcm_uframes_t silence_filled; /* size filled with silence */
306
307 union snd_pcm_sync_id sync; /* hardware synchronization ID */
308
309 /* -- mmap -- */
310 struct snd_pcm_mmap_status *status;
311 struct snd_pcm_mmap_control *control;
312
313 /* -- locking / scheduling -- */
314 unsigned int nowake: 1; /* no wakeup (data-copy in progress) */
315 wait_queue_head_t sleep;
316 struct fasync_struct *fasync;
317
318 /* -- private section -- */
319 void *private_data;
320 void (*private_free)(struct snd_pcm_runtime *runtime);
321
322 /* -- hardware description -- */
323 struct snd_pcm_hardware hw;
324 struct snd_pcm_hw_constraints hw_constraints;
325
326 /* -- interrupt callbacks -- */
327 void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
328 void (*transfer_ack_end)(struct snd_pcm_substream *substream);
329
330 /* -- timer -- */
331 unsigned int timer_resolution; /* timer resolution */
332 int tstamp_type; /* timestamp type */
333
334 /* -- DMA -- */
335 unsigned char *dma_area; /* DMA area */
336 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
337 size_t dma_bytes; /* size of DMA area */
338
339 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
340
341 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
342 /* -- OSS things -- */
343 struct snd_pcm_oss_runtime oss;
344 #endif
345
346 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
347 struct snd_pcm_hwptr_log *hwptr_log;
348 #endif
349 };
350
351 struct snd_pcm_group { /* keep linked substreams */
352 spinlock_t lock;
353 struct list_head substreams;
354 int count;
355 };
356
357 struct pid;
358
359 struct snd_pcm_substream {
360 struct snd_pcm *pcm;
361 struct snd_pcm_str *pstr;
362 void *private_data; /* copied from pcm->private_data */
363 int number;
364 char name[32]; /* substream name */
365 int stream; /* stream (direction) */
366 char latency_id[20]; /* latency identifier */
367 size_t buffer_bytes_max; /* limit ring buffer size */
368 struct snd_dma_buffer dma_buffer;
369 unsigned int dma_buf_id;
370 size_t dma_max;
371 /* -- hardware operations -- */
372 struct snd_pcm_ops *ops;
373 /* -- runtime information -- */
374 struct snd_pcm_runtime *runtime;
375 /* -- timer section -- */
376 struct snd_timer *timer; /* timer */
377 unsigned timer_running: 1; /* time is running */
378 /* -- next substream -- */
379 struct snd_pcm_substream *next;
380 /* -- linked substreams -- */
381 struct list_head link_list; /* linked list member */
382 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
383 struct snd_pcm_group *group; /* pointer to current group */
384 /* -- assigned files -- */
385 void *file;
386 int ref_count;
387 atomic_t mmap_count;
388 unsigned int f_flags;
389 void (*pcm_release)(struct snd_pcm_substream *);
390 struct pid *pid;
391 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
392 /* -- OSS things -- */
393 struct snd_pcm_oss_substream oss;
394 #endif
395 #ifdef CONFIG_SND_VERBOSE_PROCFS
396 struct snd_info_entry *proc_root;
397 struct snd_info_entry *proc_info_entry;
398 struct snd_info_entry *proc_hw_params_entry;
399 struct snd_info_entry *proc_sw_params_entry;
400 struct snd_info_entry *proc_status_entry;
401 struct snd_info_entry *proc_prealloc_entry;
402 struct snd_info_entry *proc_prealloc_max_entry;
403 #endif
404 /* misc flags */
405 unsigned int hw_opened: 1;
406 };
407
408 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
409
410
411 struct snd_pcm_str {
412 int stream; /* stream (direction) */
413 struct snd_pcm *pcm;
414 /* -- substreams -- */
415 unsigned int substream_count;
416 unsigned int substream_opened;
417 struct snd_pcm_substream *substream;
418 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
419 /* -- OSS things -- */
420 struct snd_pcm_oss_stream oss;
421 #endif
422 #ifdef CONFIG_SND_VERBOSE_PROCFS
423 struct snd_info_entry *proc_root;
424 struct snd_info_entry *proc_info_entry;
425 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
426 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
427 struct snd_info_entry *proc_xrun_debug_entry;
428 #endif
429 #endif
430 };
431
432 struct snd_pcm {
433 struct snd_card *card;
434 struct list_head list;
435 int device; /* device number */
436 unsigned int info_flags;
437 unsigned short dev_class;
438 unsigned short dev_subclass;
439 char id[64];
440 char name[80];
441 struct snd_pcm_str streams[2];
442 struct mutex open_mutex;
443 wait_queue_head_t open_wait;
444 void *private_data;
445 void (*private_free) (struct snd_pcm *pcm);
446 struct device *dev; /* actual hw device this belongs to */
447 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
448 struct snd_pcm_oss oss;
449 #endif
450 };
451
452 struct snd_pcm_notify {
453 int (*n_register) (struct snd_pcm * pcm);
454 int (*n_disconnect) (struct snd_pcm * pcm);
455 int (*n_unregister) (struct snd_pcm * pcm);
456 struct list_head list;
457 };
458
459 /*
460 * Registering
461 */
462
463 extern const struct file_operations snd_pcm_f_ops[2];
464
465 int snd_pcm_new(struct snd_card *card, const char *id, int device,
466 int playback_count, int capture_count,
467 struct snd_pcm **rpcm);
468 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
469
470 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
471
472 /*
473 * Native I/O
474 */
475
476 extern rwlock_t snd_pcm_link_rwlock;
477
478 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
479 int snd_pcm_info_user(struct snd_pcm_substream *substream,
480 struct snd_pcm_info __user *info);
481 int snd_pcm_status(struct snd_pcm_substream *substream,
482 struct snd_pcm_status *status);
483 int snd_pcm_start(struct snd_pcm_substream *substream);
484 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
485 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
486 #ifdef CONFIG_PM
487 int snd_pcm_suspend(struct snd_pcm_substream *substream);
488 int snd_pcm_suspend_all(struct snd_pcm *pcm);
489 #endif
490 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
491 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
492 struct snd_pcm_substream **rsubstream);
493 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
494 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
495 struct snd_pcm_substream **rsubstream);
496 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
497 void snd_pcm_vma_notify_data(void *client, void *data);
498 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
499
500 /*
501 * PCM library
502 */
503
504 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
505 {
506 return substream->group != &substream->self_group;
507 }
508
509 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
510 {
511 read_lock(&snd_pcm_link_rwlock);
512 spin_lock(&substream->self_group.lock);
513 }
514
515 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
516 {
517 spin_unlock(&substream->self_group.lock);
518 read_unlock(&snd_pcm_link_rwlock);
519 }
520
521 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
522 {
523 read_lock_irq(&snd_pcm_link_rwlock);
524 spin_lock(&substream->self_group.lock);
525 }
526
527 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
528 {
529 spin_unlock(&substream->self_group.lock);
530 read_unlock_irq(&snd_pcm_link_rwlock);
531 }
532
533 #define snd_pcm_stream_lock_irqsave(substream, flags) \
534 do { \
535 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
536 spin_lock(&substream->self_group.lock); \
537 } while (0)
538
539 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
540 do { \
541 spin_unlock(&substream->self_group.lock); \
542 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
543 } while (0)
544
545 #define snd_pcm_group_for_each_entry(s, substream) \
546 list_for_each_entry(s, &substream->group->substreams, link_list)
547
548 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
549 {
550 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
551 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
552 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
553 }
554
555 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
556 {
557 return size * 8 / runtime->sample_bits;
558 }
559
560 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
561 {
562 return size * 8 / runtime->frame_bits;
563 }
564
565 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
566 {
567 return size * runtime->sample_bits / 8;
568 }
569
570 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
571 {
572 return size * runtime->frame_bits / 8;
573 }
574
575 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
576 {
577 return bytes % runtime->byte_align == 0;
578 }
579
580 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
581 {
582 struct snd_pcm_runtime *runtime = substream->runtime;
583 return frames_to_bytes(runtime, runtime->buffer_size);
584 }
585
586 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
587 {
588 struct snd_pcm_runtime *runtime = substream->runtime;
589 return frames_to_bytes(runtime, runtime->period_size);
590 }
591
592 /*
593 * result is: 0 ... (boundary - 1)
594 */
595 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
596 {
597 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
598 if (avail < 0)
599 avail += runtime->boundary;
600 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
601 avail -= runtime->boundary;
602 return avail;
603 }
604
605 /*
606 * result is: 0 ... (boundary - 1)
607 */
608 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
609 {
610 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
611 if (avail < 0)
612 avail += runtime->boundary;
613 return avail;
614 }
615
616 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
617 {
618 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
619 }
620
621 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
622 {
623 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
624 }
625
626 /**
627 * snd_pcm_playback_ready - check whether the playback buffer is available
628 * @substream: the pcm substream instance
629 *
630 * Checks whether enough free space is available on the playback buffer.
631 *
632 * Returns non-zero if available, or zero if not.
633 */
634 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
635 {
636 struct snd_pcm_runtime *runtime = substream->runtime;
637 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
638 }
639
640 /**
641 * snd_pcm_capture_ready - check whether the capture buffer is available
642 * @substream: the pcm substream instance
643 *
644 * Checks whether enough capture data is available on the capture buffer.
645 *
646 * Returns non-zero if available, or zero if not.
647 */
648 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
649 {
650 struct snd_pcm_runtime *runtime = substream->runtime;
651 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
652 }
653
654 /**
655 * snd_pcm_playback_data - check whether any data exists on the playback buffer
656 * @substream: the pcm substream instance
657 *
658 * Checks whether any data exists on the playback buffer. If stop_threshold
659 * is bigger or equal to boundary, then this function returns always non-zero.
660 *
661 * Returns non-zero if exists, or zero if not.
662 */
663 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
664 {
665 struct snd_pcm_runtime *runtime = substream->runtime;
666
667 if (runtime->stop_threshold >= runtime->boundary)
668 return 1;
669 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
670 }
671
672 /**
673 * snd_pcm_playback_empty - check whether the playback buffer is empty
674 * @substream: the pcm substream instance
675 *
676 * Checks whether the playback buffer is empty.
677 *
678 * Returns non-zero if empty, or zero if not.
679 */
680 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
681 {
682 struct snd_pcm_runtime *runtime = substream->runtime;
683 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
684 }
685
686 /**
687 * snd_pcm_capture_empty - check whether the capture buffer is empty
688 * @substream: the pcm substream instance
689 *
690 * Checks whether the capture buffer is empty.
691 *
692 * Returns non-zero if empty, or zero if not.
693 */
694 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
695 {
696 struct snd_pcm_runtime *runtime = substream->runtime;
697 return snd_pcm_capture_avail(runtime) == 0;
698 }
699
700 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
701 struct snd_pcm_substream *master)
702 {
703 substream->runtime->trigger_master = master;
704 }
705
706 static inline int hw_is_mask(int var)
707 {
708 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
709 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
710 }
711
712 static inline int hw_is_interval(int var)
713 {
714 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
715 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
716 }
717
718 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
719 snd_pcm_hw_param_t var)
720 {
721 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
722 }
723
724 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
725 snd_pcm_hw_param_t var)
726 {
727 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
728 }
729
730 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
731 snd_pcm_hw_param_t var)
732 {
733 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
734 }
735
736 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
737 snd_pcm_hw_param_t var)
738 {
739 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
740 }
741
742 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
743 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
744 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
745 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
746 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
747 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
748 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
749 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
750 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
751 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
752
753
754 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
755 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
756 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
757 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
758 unsigned int k, struct snd_interval *c);
759 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
760 const struct snd_interval *b, struct snd_interval *c);
761 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
762 int snd_interval_ratnum(struct snd_interval *i,
763 unsigned int rats_count, struct snd_ratnum *rats,
764 unsigned int *nump, unsigned int *denp);
765
766 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
767 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
768 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
769
770 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
771
772 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
773 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
774
775 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
776 u_int32_t mask);
777 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
778 u_int64_t mask);
779 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
780 unsigned int min, unsigned int max);
781 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
782 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
783 unsigned int cond,
784 snd_pcm_hw_param_t var,
785 struct snd_pcm_hw_constraint_list *l);
786 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
787 unsigned int cond,
788 snd_pcm_hw_param_t var,
789 struct snd_pcm_hw_constraint_ratnums *r);
790 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
791 unsigned int cond,
792 snd_pcm_hw_param_t var,
793 struct snd_pcm_hw_constraint_ratdens *r);
794 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
795 unsigned int cond,
796 unsigned int width,
797 unsigned int msbits);
798 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
799 unsigned int cond,
800 snd_pcm_hw_param_t var,
801 unsigned long step);
802 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
803 unsigned int cond,
804 snd_pcm_hw_param_t var);
805 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
806 unsigned int cond,
807 int var,
808 snd_pcm_hw_rule_func_t func, void *private,
809 int dep, ...);
810
811 int snd_pcm_format_signed(snd_pcm_format_t format);
812 int snd_pcm_format_unsigned(snd_pcm_format_t format);
813 int snd_pcm_format_linear(snd_pcm_format_t format);
814 int snd_pcm_format_little_endian(snd_pcm_format_t format);
815 int snd_pcm_format_big_endian(snd_pcm_format_t format);
816 #if 0 /* just for DocBook */
817 /**
818 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
819 * @format: the format to check
820 *
821 * Returns 1 if the given PCM format is CPU-endian, 0 if
822 * opposite, or a negative error code if endian not specified.
823 */
824 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
825 #endif /* DocBook */
826 #ifdef SNDRV_LITTLE_ENDIAN
827 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
828 #else
829 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
830 #endif
831 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
832 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
833 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
834 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
835 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
836 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
837
838 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
839 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
840 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
841 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
842 unsigned int cmd, void *arg);
843 int snd_pcm_update_state(struct snd_pcm_substream *substream,
844 struct snd_pcm_runtime *runtime);
845 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
846 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
847 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
848 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
849 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
850 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
851 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
852 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
853 const void __user *buf,
854 snd_pcm_uframes_t frames);
855 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
856 void __user *buf, snd_pcm_uframes_t frames);
857 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
858 void __user **bufs, snd_pcm_uframes_t frames);
859 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
860 void __user **bufs, snd_pcm_uframes_t frames);
861
862 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
863
864 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
865 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
866
867 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
868 struct snd_dma_buffer *bufp)
869 {
870 struct snd_pcm_runtime *runtime = substream->runtime;
871 if (bufp) {
872 runtime->dma_buffer_p = bufp;
873 runtime->dma_area = bufp->area;
874 runtime->dma_addr = bufp->addr;
875 runtime->dma_bytes = bufp->bytes;
876 } else {
877 runtime->dma_buffer_p = NULL;
878 runtime->dma_area = NULL;
879 runtime->dma_addr = 0;
880 runtime->dma_bytes = 0;
881 }
882 }
883
884 /*
885 * Timer interface
886 */
887
888 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
889 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
890 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
891
892 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
893 struct timespec *tv)
894 {
895 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
896 do_posix_clock_monotonic_gettime(tv);
897 else
898 getnstimeofday(tv);
899 }
900
901 /*
902 * Memory
903 */
904
905 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
906 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
907 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
908 int type, struct device *data,
909 size_t size, size_t max);
910 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
911 int type, void *data,
912 size_t size, size_t max);
913 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
914 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
915
916 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
917 size_t size, gfp_t gfp_flags);
918 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
919 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
920 unsigned long offset);
921 #if 0 /* for kernel-doc */
922 /**
923 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
924 * @substream: the substream to allocate the buffer to
925 * @size: the requested buffer size, in bytes
926 *
927 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
928 * contiguous in kernel virtual space, but not in physical memory. Use this
929 * if the buffer is accessed by kernel code but not by device DMA.
930 *
931 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
932 * code.
933 */
934 static int snd_pcm_lib_alloc_vmalloc_buffer
935 (struct snd_pcm_substream *substream, size_t size);
936 /**
937 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
938 * @substream: the substream to allocate the buffer to
939 * @size: the requested buffer size, in bytes
940 *
941 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
942 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
943 */
944 static int snd_pcm_lib_alloc_vmalloc_32_buffer
945 (struct snd_pcm_substream *substream, size_t size);
946 #endif
947 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
948 _snd_pcm_lib_alloc_vmalloc_buffer \
949 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
950 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
951 _snd_pcm_lib_alloc_vmalloc_buffer \
952 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
953
954 #ifdef CONFIG_SND_DMA_SGBUF
955 /*
956 * SG-buffer handling
957 */
958 #define snd_pcm_substream_sgbuf(substream) \
959 ((substream)->runtime->dma_buffer_p->private_data)
960
961 static inline dma_addr_t
962 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
963 {
964 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
965 return snd_sgbuf_get_addr(sg, ofs);
966 }
967
968 static inline void *
969 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
970 {
971 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
972 return snd_sgbuf_get_ptr(sg, ofs);
973 }
974
975 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
976 unsigned long offset);
977 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
978 unsigned int ofs, unsigned int size);
979
980 #else /* !SND_DMA_SGBUF */
981 /*
982 * fake using a continuous buffer
983 */
984 static inline dma_addr_t
985 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
986 {
987 return substream->runtime->dma_addr + ofs;
988 }
989
990 static inline void *
991 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
992 {
993 return substream->runtime->dma_area + ofs;
994 }
995
996 #define snd_pcm_sgbuf_ops_page NULL
997
998 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size)
999
1000 #endif /* SND_DMA_SGBUF */
1001
1002 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1003 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1004 {
1005 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1006 atomic_inc(&substream->mmap_count);
1007 }
1008
1009 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1010 {
1011 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1012 atomic_dec(&substream->mmap_count);
1013 }
1014
1015 /* mmap for io-memory area */
1016 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1017 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1018 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1019 #else
1020 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1021 #define snd_pcm_lib_mmap_iomem NULL
1022 #endif
1023
1024 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
1025 struct vm_area_struct *area);
1026 #define snd_pcm_lib_mmap_vmalloc snd_pcm_lib_mmap_noncached
1027
1028 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1029 {
1030 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1031 }
1032
1033 /*
1034 * Misc
1035 */
1036
1037 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1038 (IEC958_AES1_CON_ORIGINAL<<8)|\
1039 (IEC958_AES1_CON_PCM_CODER<<8)|\
1040 (IEC958_AES3_CON_FS_48000<<24))
1041
1042 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1043
1044 const char *snd_pcm_format_name(snd_pcm_format_t format);
1045
1046 #endif /* __SOUND_PCM_H */
Linux kernel - Deliverables
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