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 IS_ENABLED(CONFIG_SND_PCM_OSS)
38 #include <sound/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_audio_tstamp_config; /* definitions further down */
64 struct snd_pcm_audio_tstamp_report;
65
66 struct snd_pcm_ops {
67 int (*open)(struct snd_pcm_substream *substream);
68 int (*close)(struct snd_pcm_substream *substream);
69 int (*ioctl)(struct snd_pcm_substream * substream,
70 unsigned int cmd, void *arg);
71 int (*hw_params)(struct snd_pcm_substream *substream,
72 struct snd_pcm_hw_params *params);
73 int (*hw_free)(struct snd_pcm_substream *substream);
74 int (*prepare)(struct snd_pcm_substream *substream);
75 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
76 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
77 int (*get_time_info)(struct snd_pcm_substream *substream,
78 struct timespec *system_ts, struct timespec *audio_ts,
79 struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
80 struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
81 int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
82 unsigned long pos, unsigned long bytes);
83 int (*copy_user)(struct snd_pcm_substream *substream, int channel,
84 unsigned long pos, void __user *buf,
85 unsigned long bytes);
86 int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
87 unsigned long pos, void *buf, unsigned long bytes);
88 struct page *(*page)(struct snd_pcm_substream *substream,
89 unsigned long offset);
90 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
91 int (*ack)(struct snd_pcm_substream *substream);
92 };
93
94 /*
95 *
96 */
97
98 #if defined(CONFIG_SND_DYNAMIC_MINORS)
99 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
100 #else
101 #define SNDRV_PCM_DEVICES 8
102 #endif
103
104 #define SNDRV_PCM_IOCTL1_RESET 0
105 /* 1 is absent slot. */
106 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
107 /* 3 is absent slot. */
108 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
109
110 #define SNDRV_PCM_TRIGGER_STOP 0
111 #define SNDRV_PCM_TRIGGER_START 1
112 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
113 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
114 #define SNDRV_PCM_TRIGGER_SUSPEND 5
115 #define SNDRV_PCM_TRIGGER_RESUME 6
116 #define SNDRV_PCM_TRIGGER_DRAIN 7
117
118 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
119
120 /* If you change this don't forget to change rates[] table in pcm_native.c */
121 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
122 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
123 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
124 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
125 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
126 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
127 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
128 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
129 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
130 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
131 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
132 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
133 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
134
135 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
136 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
137
138 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
139 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
140 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
141 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
142 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
143 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
144 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
145 SNDRV_PCM_RATE_192000)
146 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
147 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
148 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
149 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
150 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
151 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
152 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
153 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
154 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
155 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
156 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
157 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
158 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
159 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
160 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
161 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
162 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
163 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
164 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
165 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
166 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
167 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
168 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
169 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
170 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
171 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
172 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
173 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
174 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
175 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
176 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
177 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
178 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
179 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
180 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
181 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
182 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
183 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
184 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
185 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
186 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
187 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
188 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
189 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
190 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
191 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
192 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
193 #define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
194 #define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
195 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
196 #define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
197 #define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
198
199 #ifdef SNDRV_LITTLE_ENDIAN
200 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
201 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
202 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
203 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
204 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
205 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
206 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
207 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
208 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
209 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
210 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
211 #endif
212 #ifdef SNDRV_BIG_ENDIAN
213 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
214 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
215 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
216 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
217 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
218 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
219 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
220 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
221 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
222 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
223 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
224 #endif
225
226 struct snd_pcm_file {
227 struct snd_pcm_substream *substream;
228 int no_compat_mmap;
229 unsigned int user_pversion; /* supported protocol version */
230 };
231
232 struct snd_pcm_hw_rule;
233 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
234 struct snd_pcm_hw_rule *rule);
235
236 struct snd_pcm_hw_rule {
237 unsigned int cond;
238 int var;
239 int deps[4];
240
241 snd_pcm_hw_rule_func_t func;
242 void *private;
243 };
244
245 struct snd_pcm_hw_constraints {
246 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
247 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
248 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
249 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
250 unsigned int rules_num;
251 unsigned int rules_all;
252 struct snd_pcm_hw_rule *rules;
253 };
254
constrs_mask(struct snd_pcm_hw_constraints * constrs,snd_pcm_hw_param_t var)255 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
256 snd_pcm_hw_param_t var)
257 {
258 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
259 }
260
constrs_interval(struct snd_pcm_hw_constraints * constrs,snd_pcm_hw_param_t var)261 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
262 snd_pcm_hw_param_t var)
263 {
264 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
265 }
266
267 struct snd_ratnum {
268 unsigned int num;
269 unsigned int den_min, den_max, den_step;
270 };
271
272 struct snd_ratden {
273 unsigned int num_min, num_max, num_step;
274 unsigned int den;
275 };
276
277 struct snd_pcm_hw_constraint_ratnums {
278 int nrats;
279 const struct snd_ratnum *rats;
280 };
281
282 struct snd_pcm_hw_constraint_ratdens {
283 int nrats;
284 const struct snd_ratden *rats;
285 };
286
287 struct snd_pcm_hw_constraint_list {
288 const unsigned int *list;
289 unsigned int count;
290 unsigned int mask;
291 };
292
293 struct snd_pcm_hw_constraint_ranges {
294 unsigned int count;
295 const struct snd_interval *ranges;
296 unsigned int mask;
297 };
298
299 /*
300 * userspace-provided audio timestamp config to kernel,
301 * structure is for internal use only and filled with dedicated unpack routine
302 */
303 struct snd_pcm_audio_tstamp_config {
304 /* 5 of max 16 bits used */
305 u32 type_requested:4;
306 u32 report_delay:1; /* add total delay to A/D or D/A */
307 };
308
snd_pcm_unpack_audio_tstamp_config(__u32 data,struct snd_pcm_audio_tstamp_config * config)309 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
310 struct snd_pcm_audio_tstamp_config *config)
311 {
312 config->type_requested = data & 0xF;
313 config->report_delay = (data >> 4) & 1;
314 }
315
316 /*
317 * kernel-provided audio timestamp report to user-space
318 * structure is for internal use only and read by dedicated pack routine
319 */
320 struct snd_pcm_audio_tstamp_report {
321 /* 6 of max 16 bits used for bit-fields */
322
323 /* for backwards compatibility */
324 u32 valid:1;
325
326 /* actual type if hardware could not support requested timestamp */
327 u32 actual_type:4;
328
329 /* accuracy represented in ns units */
330 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
331 u32 accuracy; /* up to 4.29s, will be packed in separate field */
332 };
333
snd_pcm_pack_audio_tstamp_report(__u32 * data,__u32 * accuracy,const struct snd_pcm_audio_tstamp_report * report)334 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
335 const struct snd_pcm_audio_tstamp_report *report)
336 {
337 u32 tmp;
338
339 tmp = report->accuracy_report;
340 tmp <<= 4;
341 tmp |= report->actual_type;
342 tmp <<= 1;
343 tmp |= report->valid;
344
345 *data &= 0xffff; /* zero-clear MSBs */
346 *data |= (tmp << 16);
347 *accuracy = report->accuracy;
348 }
349
350
351 struct snd_pcm_runtime {
352 /* -- Status -- */
353 struct snd_pcm_substream *trigger_master;
354 struct timespec trigger_tstamp; /* trigger timestamp */
355 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
356 int overrange;
357 snd_pcm_uframes_t avail_max;
358 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
359 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
360 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
361 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
362 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
363 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
364
365 /* -- HW params -- */
366 snd_pcm_access_t access; /* access mode */
367 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
368 snd_pcm_subformat_t subformat; /* subformat */
369 unsigned int rate; /* rate in Hz */
370 unsigned int channels; /* channels */
371 snd_pcm_uframes_t period_size; /* period size */
372 unsigned int periods; /* periods */
373 snd_pcm_uframes_t buffer_size; /* buffer size */
374 snd_pcm_uframes_t min_align; /* Min alignment for the format */
375 size_t byte_align;
376 unsigned int frame_bits;
377 unsigned int sample_bits;
378 unsigned int info;
379 unsigned int rate_num;
380 unsigned int rate_den;
381 unsigned int no_period_wakeup: 1;
382
383 /* -- SW params -- */
384 int tstamp_mode; /* mmap timestamp is updated */
385 unsigned int period_step;
386 snd_pcm_uframes_t start_threshold;
387 snd_pcm_uframes_t stop_threshold;
388 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
389 noise is nearest than this */
390 snd_pcm_uframes_t silence_size; /* Silence filling size */
391 snd_pcm_uframes_t boundary; /* pointers wrap point */
392
393 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
394 snd_pcm_uframes_t silence_filled; /* size filled with silence */
395
396 union snd_pcm_sync_id sync; /* hardware synchronization ID */
397
398 /* -- mmap -- */
399 struct snd_pcm_mmap_status *status;
400 struct snd_pcm_mmap_control *control;
401
402 /* -- locking / scheduling -- */
403 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
404 wait_queue_head_t sleep; /* poll sleep */
405 wait_queue_head_t tsleep; /* transfer sleep */
406 struct fasync_struct *fasync;
407 struct mutex buffer_mutex; /* protect for buffer changes */
408 atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */
409
410 /* -- private section -- */
411 void *private_data;
412 void (*private_free)(struct snd_pcm_runtime *runtime);
413
414 /* -- hardware description -- */
415 struct snd_pcm_hardware hw;
416 struct snd_pcm_hw_constraints hw_constraints;
417
418 /* -- timer -- */
419 unsigned int timer_resolution; /* timer resolution */
420 int tstamp_type; /* timestamp type */
421
422 /* -- DMA -- */
423 unsigned char *dma_area; /* DMA area */
424 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
425 size_t dma_bytes; /* size of DMA area */
426
427 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
428
429 /* -- audio timestamp config -- */
430 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
431 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
432 struct timespec driver_tstamp;
433
434 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
435 /* -- OSS things -- */
436 struct snd_pcm_oss_runtime oss;
437 #endif
438 };
439
440 struct snd_pcm_group { /* keep linked substreams */
441 spinlock_t lock;
442 struct mutex mutex;
443 struct list_head substreams;
444 int count;
445 };
446
447 struct pid;
448
449 struct snd_pcm_substream {
450 struct snd_pcm *pcm;
451 struct snd_pcm_str *pstr;
452 void *private_data; /* copied from pcm->private_data */
453 int number;
454 char name[32]; /* substream name */
455 int stream; /* stream (direction) */
456 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
457 size_t buffer_bytes_max; /* limit ring buffer size */
458 struct snd_dma_buffer dma_buffer;
459 size_t dma_max;
460 /* -- hardware operations -- */
461 const struct snd_pcm_ops *ops;
462 /* -- runtime information -- */
463 struct snd_pcm_runtime *runtime;
464 /* -- timer section -- */
465 struct snd_timer *timer; /* timer */
466 unsigned timer_running: 1; /* time is running */
467 long wait_time; /* time in ms for R/W to wait for avail */
468 /* -- next substream -- */
469 struct snd_pcm_substream *next;
470 /* -- linked substreams -- */
471 struct list_head link_list; /* linked list member */
472 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
473 struct snd_pcm_group *group; /* pointer to current group */
474 /* -- assigned files -- */
475 void *file;
476 int ref_count;
477 atomic_t mmap_count;
478 unsigned int f_flags;
479 void (*pcm_release)(struct snd_pcm_substream *);
480 struct pid *pid;
481 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
482 /* -- OSS things -- */
483 struct snd_pcm_oss_substream oss;
484 #endif
485 #ifdef CONFIG_SND_VERBOSE_PROCFS
486 struct snd_info_entry *proc_root;
487 struct snd_info_entry *proc_info_entry;
488 struct snd_info_entry *proc_hw_params_entry;
489 struct snd_info_entry *proc_sw_params_entry;
490 struct snd_info_entry *proc_status_entry;
491 struct snd_info_entry *proc_prealloc_entry;
492 struct snd_info_entry *proc_prealloc_max_entry;
493 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
494 struct snd_info_entry *proc_xrun_injection_entry;
495 #endif
496 #endif /* CONFIG_SND_VERBOSE_PROCFS */
497 /* misc flags */
498 unsigned int hw_opened: 1;
499 };
500
501 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
502
503
504 struct snd_pcm_str {
505 int stream; /* stream (direction) */
506 struct snd_pcm *pcm;
507 /* -- substreams -- */
508 unsigned int substream_count;
509 unsigned int substream_opened;
510 struct snd_pcm_substream *substream;
511 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
512 /* -- OSS things -- */
513 struct snd_pcm_oss_stream oss;
514 #endif
515 #ifdef CONFIG_SND_VERBOSE_PROCFS
516 struct snd_info_entry *proc_root;
517 struct snd_info_entry *proc_info_entry;
518 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
519 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
520 struct snd_info_entry *proc_xrun_debug_entry;
521 #endif
522 #endif
523 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
524 struct device dev;
525 };
526
527 struct snd_pcm {
528 struct snd_card *card;
529 struct list_head list;
530 int device; /* device number */
531 unsigned int info_flags;
532 unsigned short dev_class;
533 unsigned short dev_subclass;
534 char id[64];
535 char name[80];
536 struct snd_pcm_str streams[2];
537 struct mutex open_mutex;
538 wait_queue_head_t open_wait;
539 void *private_data;
540 void (*private_free) (struct snd_pcm *pcm);
541 bool internal; /* pcm is for internal use only */
542 bool nonatomic; /* whole PCM operations are in non-atomic context */
543 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
544 struct snd_pcm_oss oss;
545 #endif
546 };
547
548 /*
549 * Registering
550 */
551
552 extern const struct file_operations snd_pcm_f_ops[2];
553
554 int snd_pcm_new(struct snd_card *card, const char *id, int device,
555 int playback_count, int capture_count,
556 struct snd_pcm **rpcm);
557 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
558 int playback_count, int capture_count,
559 struct snd_pcm **rpcm);
560 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
561
562 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
563 struct snd_pcm_notify {
564 int (*n_register) (struct snd_pcm * pcm);
565 int (*n_disconnect) (struct snd_pcm * pcm);
566 int (*n_unregister) (struct snd_pcm * pcm);
567 struct list_head list;
568 };
569 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
570 #endif
571
572 /*
573 * Native I/O
574 */
575
576 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
577 int snd_pcm_info_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_info __user *info);
579 int snd_pcm_status(struct snd_pcm_substream *substream,
580 struct snd_pcm_status *status);
581 int snd_pcm_start(struct snd_pcm_substream *substream);
582 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
583 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
584 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
585 #ifdef CONFIG_PM
586 int snd_pcm_suspend(struct snd_pcm_substream *substream);
587 int snd_pcm_suspend_all(struct snd_pcm *pcm);
588 #else
snd_pcm_suspend(struct snd_pcm_substream * substream)589 static inline int snd_pcm_suspend(struct snd_pcm_substream *substream)
590 {
591 return 0;
592 }
snd_pcm_suspend_all(struct snd_pcm * pcm)593 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
594 {
595 return 0;
596 }
597 #endif
598 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
599 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
600 struct snd_pcm_substream **rsubstream);
601 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
602 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
603 struct snd_pcm_substream **rsubstream);
604 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
605 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
606
607
608 #ifdef CONFIG_SND_DEBUG
609 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
610 char *name, size_t len);
611 #else
612 static inline void
snd_pcm_debug_name(struct snd_pcm_substream * substream,char * buf,size_t size)613 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
614 {
615 *buf = 0;
616 }
617 #endif
618
619 /*
620 * PCM library
621 */
622
623 /**
624 * snd_pcm_stream_linked - Check whether the substream is linked with others
625 * @substream: substream to check
626 *
627 * Returns true if the given substream is being linked with others.
628 */
snd_pcm_stream_linked(struct snd_pcm_substream * substream)629 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
630 {
631 return substream->group != &substream->self_group;
632 }
633
634 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
635 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
636 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
637 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
638 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
639
640 /**
641 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
642 * @substream: PCM substream
643 * @flags: irq flags
644 *
645 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
646 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
647 * as snd_pcm_stream_lock().
648 */
649 #define snd_pcm_stream_lock_irqsave(substream, flags) \
650 do { \
651 typecheck(unsigned long, flags); \
652 flags = _snd_pcm_stream_lock_irqsave(substream); \
653 } while (0)
654 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
655 unsigned long flags);
656
657 /**
658 * snd_pcm_group_for_each_entry - iterate over the linked substreams
659 * @s: the iterator
660 * @substream: the substream
661 *
662 * Iterate over the all linked substreams to the given @substream.
663 * When @substream isn't linked with any others, this gives returns @substream
664 * itself once.
665 */
666 #define snd_pcm_group_for_each_entry(s, substream) \
667 list_for_each_entry(s, &substream->group->substreams, link_list)
668
669 /**
670 * snd_pcm_running - Check whether the substream is in a running state
671 * @substream: substream to check
672 *
673 * Returns true if the given substream is in the state RUNNING, or in the
674 * state DRAINING for playback.
675 */
snd_pcm_running(struct snd_pcm_substream * substream)676 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
677 {
678 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
679 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
680 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
681 }
682
683 /**
684 * bytes_to_samples - Unit conversion of the size from bytes to samples
685 * @runtime: PCM runtime instance
686 * @size: size in bytes
687 */
bytes_to_samples(struct snd_pcm_runtime * runtime,ssize_t size)688 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
689 {
690 return size * 8 / runtime->sample_bits;
691 }
692
693 /**
694 * bytes_to_frames - Unit conversion of the size from bytes to frames
695 * @runtime: PCM runtime instance
696 * @size: size in bytes
697 */
bytes_to_frames(struct snd_pcm_runtime * runtime,ssize_t size)698 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
699 {
700 return size * 8 / runtime->frame_bits;
701 }
702
703 /**
704 * samples_to_bytes - Unit conversion of the size from samples to bytes
705 * @runtime: PCM runtime instance
706 * @size: size in samples
707 */
samples_to_bytes(struct snd_pcm_runtime * runtime,ssize_t size)708 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
709 {
710 return size * runtime->sample_bits / 8;
711 }
712
713 /**
714 * frames_to_bytes - Unit conversion of the size from frames to bytes
715 * @runtime: PCM runtime instance
716 * @size: size in frames
717 */
frames_to_bytes(struct snd_pcm_runtime * runtime,snd_pcm_sframes_t size)718 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
719 {
720 return size * runtime->frame_bits / 8;
721 }
722
723 /**
724 * frame_aligned - Check whether the byte size is aligned to frames
725 * @runtime: PCM runtime instance
726 * @bytes: size in bytes
727 */
frame_aligned(struct snd_pcm_runtime * runtime,ssize_t bytes)728 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
729 {
730 return bytes % runtime->byte_align == 0;
731 }
732
733 /**
734 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
735 * @substream: PCM substream
736 */
snd_pcm_lib_buffer_bytes(struct snd_pcm_substream * substream)737 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
738 {
739 struct snd_pcm_runtime *runtime = substream->runtime;
740 return frames_to_bytes(runtime, runtime->buffer_size);
741 }
742
743 /**
744 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
745 * @substream: PCM substream
746 */
snd_pcm_lib_period_bytes(struct snd_pcm_substream * substream)747 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
748 {
749 struct snd_pcm_runtime *runtime = substream->runtime;
750 return frames_to_bytes(runtime, runtime->period_size);
751 }
752
753 /**
754 * snd_pcm_playback_avail - Get the available (writable) space for playback
755 * @runtime: PCM runtime instance
756 *
757 * Result is between 0 ... (boundary - 1)
758 */
snd_pcm_playback_avail(struct snd_pcm_runtime * runtime)759 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
760 {
761 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
762 if (avail < 0)
763 avail += runtime->boundary;
764 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
765 avail -= runtime->boundary;
766 return avail;
767 }
768
769 /**
770 * snd_pcm_playback_avail - Get the available (readable) space for capture
771 * @runtime: PCM runtime instance
772 *
773 * Result is between 0 ... (boundary - 1)
774 */
snd_pcm_capture_avail(struct snd_pcm_runtime * runtime)775 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
776 {
777 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
778 if (avail < 0)
779 avail += runtime->boundary;
780 return avail;
781 }
782
783 /**
784 * snd_pcm_playback_hw_avail - Get the queued space for playback
785 * @runtime: PCM runtime instance
786 */
snd_pcm_playback_hw_avail(struct snd_pcm_runtime * runtime)787 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
788 {
789 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
790 }
791
792 /**
793 * snd_pcm_capture_hw_avail - Get the free space for capture
794 * @runtime: PCM runtime instance
795 */
snd_pcm_capture_hw_avail(struct snd_pcm_runtime * runtime)796 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
797 {
798 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
799 }
800
801 /**
802 * snd_pcm_playback_ready - check whether the playback buffer is available
803 * @substream: the pcm substream instance
804 *
805 * Checks whether enough free space is available on the playback buffer.
806 *
807 * Return: Non-zero if available, or zero if not.
808 */
snd_pcm_playback_ready(struct snd_pcm_substream * substream)809 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
810 {
811 struct snd_pcm_runtime *runtime = substream->runtime;
812 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
813 }
814
815 /**
816 * snd_pcm_capture_ready - check whether the capture buffer is available
817 * @substream: the pcm substream instance
818 *
819 * Checks whether enough capture data is available on the capture buffer.
820 *
821 * Return: Non-zero if available, or zero if not.
822 */
snd_pcm_capture_ready(struct snd_pcm_substream * substream)823 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
824 {
825 struct snd_pcm_runtime *runtime = substream->runtime;
826 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
827 }
828
829 /**
830 * snd_pcm_playback_data - check whether any data exists on the playback buffer
831 * @substream: the pcm substream instance
832 *
833 * Checks whether any data exists on the playback buffer.
834 *
835 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
836 * is bigger or equal to boundary, then this function returns always non-zero.
837 */
snd_pcm_playback_data(struct snd_pcm_substream * substream)838 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
839 {
840 struct snd_pcm_runtime *runtime = substream->runtime;
841
842 if (runtime->stop_threshold >= runtime->boundary)
843 return 1;
844 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
845 }
846
847 /**
848 * snd_pcm_playback_empty - check whether the playback buffer is empty
849 * @substream: the pcm substream instance
850 *
851 * Checks whether the playback buffer is empty.
852 *
853 * Return: Non-zero if empty, or zero if not.
854 */
snd_pcm_playback_empty(struct snd_pcm_substream * substream)855 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
856 {
857 struct snd_pcm_runtime *runtime = substream->runtime;
858 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
859 }
860
861 /**
862 * snd_pcm_capture_empty - check whether the capture buffer is empty
863 * @substream: the pcm substream instance
864 *
865 * Checks whether the capture buffer is empty.
866 *
867 * Return: Non-zero if empty, or zero if not.
868 */
snd_pcm_capture_empty(struct snd_pcm_substream * substream)869 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
870 {
871 struct snd_pcm_runtime *runtime = substream->runtime;
872 return snd_pcm_capture_avail(runtime) == 0;
873 }
874
875 /**
876 * snd_pcm_trigger_done - Mark the master substream
877 * @substream: the pcm substream instance
878 * @master: the linked master substream
879 *
880 * When multiple substreams of the same card are linked and the hardware
881 * supports the single-shot operation, the driver calls this in the loop
882 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
883 * Then most of trigger operations are performed only to the given master
884 * substream.
885 *
886 * The trigger_master mark is cleared at timestamp updates at the end
887 * of trigger operations.
888 */
snd_pcm_trigger_done(struct snd_pcm_substream * substream,struct snd_pcm_substream * master)889 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
890 struct snd_pcm_substream *master)
891 {
892 substream->runtime->trigger_master = master;
893 }
894
hw_is_mask(int var)895 static inline int hw_is_mask(int var)
896 {
897 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
898 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
899 }
900
hw_is_interval(int var)901 static inline int hw_is_interval(int var)
902 {
903 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
904 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
905 }
906
hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)907 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
908 snd_pcm_hw_param_t var)
909 {
910 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
911 }
912
hw_param_interval(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)913 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
914 snd_pcm_hw_param_t var)
915 {
916 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
917 }
918
hw_param_mask_c(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)919 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
920 snd_pcm_hw_param_t var)
921 {
922 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
923 }
924
hw_param_interval_c(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)925 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
926 snd_pcm_hw_param_t var)
927 {
928 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
929 }
930
931 /**
932 * params_channels - Get the number of channels from the hw params
933 * @p: hw params
934 */
params_channels(const struct snd_pcm_hw_params * p)935 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
936 {
937 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
938 }
939
940 /**
941 * params_rate - Get the sample rate from the hw params
942 * @p: hw params
943 */
params_rate(const struct snd_pcm_hw_params * p)944 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
945 {
946 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
947 }
948
949 /**
950 * params_period_size - Get the period size (in frames) from the hw params
951 * @p: hw params
952 */
params_period_size(const struct snd_pcm_hw_params * p)953 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
954 {
955 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
956 }
957
958 /**
959 * params_periods - Get the number of periods from the hw params
960 * @p: hw params
961 */
params_periods(const struct snd_pcm_hw_params * p)962 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
963 {
964 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
965 }
966
967 /**
968 * params_buffer_size - Get the buffer size (in frames) from the hw params
969 * @p: hw params
970 */
params_buffer_size(const struct snd_pcm_hw_params * p)971 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
972 {
973 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
974 }
975
976 /**
977 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
978 * @p: hw params
979 */
params_buffer_bytes(const struct snd_pcm_hw_params * p)980 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
981 {
982 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
983 }
984
985 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
986 int snd_interval_list(struct snd_interval *i, unsigned int count,
987 const unsigned int *list, unsigned int mask);
988 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
989 const struct snd_interval *list, unsigned int mask);
990 int snd_interval_ratnum(struct snd_interval *i,
991 unsigned int rats_count, const struct snd_ratnum *rats,
992 unsigned int *nump, unsigned int *denp);
993
994 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
995 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
996
997 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
998
999 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1000 u_int64_t mask);
1001 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1002 unsigned int min, unsigned int max);
1003 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1004 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1005 unsigned int cond,
1006 snd_pcm_hw_param_t var,
1007 const struct snd_pcm_hw_constraint_list *l);
1008 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1009 unsigned int cond,
1010 snd_pcm_hw_param_t var,
1011 const struct snd_pcm_hw_constraint_ranges *r);
1012 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1013 unsigned int cond,
1014 snd_pcm_hw_param_t var,
1015 const struct snd_pcm_hw_constraint_ratnums *r);
1016 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1017 unsigned int cond,
1018 snd_pcm_hw_param_t var,
1019 const struct snd_pcm_hw_constraint_ratdens *r);
1020 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1021 unsigned int cond,
1022 unsigned int width,
1023 unsigned int msbits);
1024 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1025 unsigned int cond,
1026 snd_pcm_hw_param_t var,
1027 unsigned long step);
1028 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1029 unsigned int cond,
1030 snd_pcm_hw_param_t var);
1031 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1032 unsigned int base_rate);
1033 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1034 unsigned int cond,
1035 int var,
1036 snd_pcm_hw_rule_func_t func, void *private,
1037 int dep, ...);
1038
1039 /**
1040 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1041 * @runtime: PCM runtime instance
1042 * @var: The hw_params variable to constrain
1043 * @val: The value to constrain to
1044 *
1045 * Return: Positive if the value is changed, zero if it's not changed, or a
1046 * negative error code.
1047 */
snd_pcm_hw_constraint_single(struct snd_pcm_runtime * runtime,snd_pcm_hw_param_t var,unsigned int val)1048 static inline int snd_pcm_hw_constraint_single(
1049 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1050 unsigned int val)
1051 {
1052 return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1053 }
1054
1055 int snd_pcm_format_signed(snd_pcm_format_t format);
1056 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1057 int snd_pcm_format_linear(snd_pcm_format_t format);
1058 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1059 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1060 #if 0 /* just for kernel-doc */
1061 /**
1062 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1063 * @format: the format to check
1064 *
1065 * Return: 1 if the given PCM format is CPU-endian, 0 if
1066 * opposite, or a negative error code if endian not specified.
1067 */
1068 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1069 #endif /* DocBook */
1070 #ifdef SNDRV_LITTLE_ENDIAN
1071 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1072 #else
1073 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1074 #endif
1075 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1076 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1077 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1078 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1079 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1080
1081 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1082 const struct snd_pcm_ops *ops);
1083 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1084 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1085 unsigned int cmd, void *arg);
1086 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1087 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1088 void *buf, bool interleaved,
1089 snd_pcm_uframes_t frames, bool in_kernel);
1090
1091 static inline snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream * substream,const void __user * buf,snd_pcm_uframes_t frames)1092 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1093 const void __user *buf, snd_pcm_uframes_t frames)
1094 {
1095 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1096 }
1097
1098 static inline snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream * substream,void __user * buf,snd_pcm_uframes_t frames)1099 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1100 void __user *buf, snd_pcm_uframes_t frames)
1101 {
1102 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1103 }
1104
1105 static inline snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream * substream,void __user ** bufs,snd_pcm_uframes_t frames)1106 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1107 void __user **bufs, snd_pcm_uframes_t frames)
1108 {
1109 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1110 }
1111
1112 static inline snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream * substream,void __user ** bufs,snd_pcm_uframes_t frames)1113 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1114 void __user **bufs, snd_pcm_uframes_t frames)
1115 {
1116 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1117 }
1118
1119 static inline snd_pcm_sframes_t
snd_pcm_kernel_write(struct snd_pcm_substream * substream,const void * buf,snd_pcm_uframes_t frames)1120 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1121 const void *buf, snd_pcm_uframes_t frames)
1122 {
1123 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1124 }
1125
1126 static inline snd_pcm_sframes_t
snd_pcm_kernel_read(struct snd_pcm_substream * substream,void * buf,snd_pcm_uframes_t frames)1127 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1128 void *buf, snd_pcm_uframes_t frames)
1129 {
1130 return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1131 }
1132
1133 static inline snd_pcm_sframes_t
snd_pcm_kernel_writev(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1134 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1135 void **bufs, snd_pcm_uframes_t frames)
1136 {
1137 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1138 }
1139
1140 static inline snd_pcm_sframes_t
snd_pcm_kernel_readv(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1141 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1142 void **bufs, snd_pcm_uframes_t frames)
1143 {
1144 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1145 }
1146
1147 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1148 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1149 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1150 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1151 unsigned int rates_b);
1152 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1153 unsigned int rate_max);
1154
1155 /**
1156 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1157 * @substream: PCM substream to set
1158 * @bufp: the buffer information, NULL to clear
1159 *
1160 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1161 * Otherwise it clears the current buffer information.
1162 */
snd_pcm_set_runtime_buffer(struct snd_pcm_substream * substream,struct snd_dma_buffer * bufp)1163 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1164 struct snd_dma_buffer *bufp)
1165 {
1166 struct snd_pcm_runtime *runtime = substream->runtime;
1167 if (bufp) {
1168 runtime->dma_buffer_p = bufp;
1169 runtime->dma_area = bufp->area;
1170 runtime->dma_addr = bufp->addr;
1171 runtime->dma_bytes = bufp->bytes;
1172 } else {
1173 runtime->dma_buffer_p = NULL;
1174 runtime->dma_area = NULL;
1175 runtime->dma_addr = 0;
1176 runtime->dma_bytes = 0;
1177 }
1178 }
1179
1180 /**
1181 * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1182 * @runtime: PCM runtime instance
1183 * @tv: timespec to fill
1184 */
snd_pcm_gettime(struct snd_pcm_runtime * runtime,struct timespec * tv)1185 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1186 struct timespec *tv)
1187 {
1188 switch (runtime->tstamp_type) {
1189 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1190 ktime_get_ts(tv);
1191 break;
1192 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1193 getrawmonotonic(tv);
1194 break;
1195 default:
1196 getnstimeofday(tv);
1197 break;
1198 }
1199 }
1200
1201 /*
1202 * Memory
1203 */
1204
1205 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1206 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1207 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1208 int type, struct device *data,
1209 size_t size, size_t max);
1210 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1211 int type, void *data,
1212 size_t size, size_t max);
1213 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1214 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1215
1216 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1217 size_t size, gfp_t gfp_flags);
1218 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1219 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1220 unsigned long offset);
1221 /**
1222 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1223 * @substream: the substream to allocate the buffer to
1224 * @size: the requested buffer size, in bytes
1225 *
1226 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1227 * contiguous in kernel virtual space, but not in physical memory. Use this
1228 * if the buffer is accessed by kernel code but not by device DMA.
1229 *
1230 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1231 * code.
1232 */
snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream * substream,size_t size)1233 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1234 (struct snd_pcm_substream *substream, size_t size)
1235 {
1236 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1237 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1238 }
1239
1240 /**
1241 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1242 * @substream: the substream to allocate the buffer to
1243 * @size: the requested buffer size, in bytes
1244 *
1245 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1246 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1247 *
1248 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1249 * code.
1250 */
snd_pcm_lib_alloc_vmalloc_32_buffer(struct snd_pcm_substream * substream,size_t size)1251 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1252 (struct snd_pcm_substream *substream, size_t size)
1253 {
1254 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1255 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1256 }
1257
1258 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1259
1260 #ifdef CONFIG_SND_DMA_SGBUF
1261 /*
1262 * SG-buffer handling
1263 */
1264 #define snd_pcm_substream_sgbuf(substream) \
1265 snd_pcm_get_dma_buf(substream)->private_data
1266
1267 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1268 unsigned long offset);
1269 #else /* !SND_DMA_SGBUF */
1270 /*
1271 * fake using a continuous buffer
1272 */
1273 #define snd_pcm_sgbuf_ops_page NULL
1274 #endif /* SND_DMA_SGBUF */
1275
1276 /**
1277 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1278 * @substream: PCM substream
1279 * @ofs: byte offset
1280 */
1281 static inline dma_addr_t
snd_pcm_sgbuf_get_addr(struct snd_pcm_substream * substream,unsigned int ofs)1282 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1283 {
1284 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1285 }
1286
1287 /**
1288 * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1289 * @substream: PCM substream
1290 * @ofs: byte offset
1291 */
1292 static inline void *
snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream * substream,unsigned int ofs)1293 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1294 {
1295 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1296 }
1297
1298 /**
1299 * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1300 * page from the given size
1301 * @substream: PCM substream
1302 * @ofs: byte offset
1303 * @size: byte size to examine
1304 */
1305 static inline unsigned int
snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream * substream,unsigned int ofs,unsigned int size)1306 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1307 unsigned int ofs, unsigned int size)
1308 {
1309 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1310 }
1311
1312 /**
1313 * snd_pcm_mmap_data_open - increase the mmap counter
1314 * @area: VMA
1315 *
1316 * PCM mmap callback should handle this counter properly
1317 */
snd_pcm_mmap_data_open(struct vm_area_struct * area)1318 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1319 {
1320 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1321 atomic_inc(&substream->mmap_count);
1322 }
1323
1324 /**
1325 * snd_pcm_mmap_data_close - decrease the mmap counter
1326 * @area: VMA
1327 *
1328 * PCM mmap callback should handle this counter properly
1329 */
snd_pcm_mmap_data_close(struct vm_area_struct * area)1330 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1331 {
1332 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1333 atomic_dec(&substream->mmap_count);
1334 }
1335
1336 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1337 struct vm_area_struct *area);
1338 /* mmap for io-memory area */
1339 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1340 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1341 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1342 #else
1343 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1344 #define snd_pcm_lib_mmap_iomem NULL
1345 #endif
1346
1347 /**
1348 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1349 * @dma: DMA number
1350 * @max: pointer to store the max size
1351 */
snd_pcm_limit_isa_dma_size(int dma,size_t * max)1352 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1353 {
1354 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1355 }
1356
1357 /*
1358 * Misc
1359 */
1360
1361 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1362 (IEC958_AES1_CON_ORIGINAL<<8)|\
1363 (IEC958_AES1_CON_PCM_CODER<<8)|\
1364 (IEC958_AES3_CON_FS_48000<<24))
1365
1366 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1367
1368 const char *snd_pcm_format_name(snd_pcm_format_t format);
1369
1370 /**
1371 * snd_pcm_stream_str - Get a string naming the direction of a stream
1372 * @substream: the pcm substream instance
1373 *
1374 * Return: A string naming the direction of the stream.
1375 */
snd_pcm_stream_str(struct snd_pcm_substream * substream)1376 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1377 {
1378 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1379 return "Playback";
1380 else
1381 return "Capture";
1382 }
1383
1384 /*
1385 * PCM channel-mapping control API
1386 */
1387 /* array element of channel maps */
1388 struct snd_pcm_chmap_elem {
1389 unsigned char channels;
1390 unsigned char map[15];
1391 };
1392
1393 /* channel map information; retrieved via snd_kcontrol_chip() */
1394 struct snd_pcm_chmap {
1395 struct snd_pcm *pcm; /* assigned PCM instance */
1396 int stream; /* PLAYBACK or CAPTURE */
1397 struct snd_kcontrol *kctl;
1398 const struct snd_pcm_chmap_elem *chmap;
1399 unsigned int max_channels;
1400 unsigned int channel_mask; /* optional: active channels bitmask */
1401 void *private_data; /* optional: private data pointer */
1402 };
1403
1404 /**
1405 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1406 * @info: chmap information
1407 * @idx: the substream number index
1408 */
1409 static inline struct snd_pcm_substream *
snd_pcm_chmap_substream(struct snd_pcm_chmap * info,unsigned int idx)1410 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1411 {
1412 struct snd_pcm_substream *s;
1413 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1414 if (s->number == idx)
1415 return s;
1416 return NULL;
1417 }
1418
1419 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1420 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1421 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1422 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1423
1424 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1425 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1426 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1427 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1428
1429 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1430 const struct snd_pcm_chmap_elem *chmap,
1431 int max_channels,
1432 unsigned long private_value,
1433 struct snd_pcm_chmap **info_ret);
1434
1435 /**
1436 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1437 * @pcm_format: PCM format
1438 */
pcm_format_to_bits(snd_pcm_format_t pcm_format)1439 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1440 {
1441 return 1ULL << (__force int) pcm_format;
1442 }
1443
1444 /* printk helpers */
1445 #define pcm_err(pcm, fmt, args...) \
1446 dev_err((pcm)->card->dev, fmt, ##args)
1447 #define pcm_warn(pcm, fmt, args...) \
1448 dev_warn((pcm)->card->dev, fmt, ##args)
1449 #define pcm_dbg(pcm, fmt, args...) \
1450 dev_dbg((pcm)->card->dev, fmt, ##args)
1451
1452 #endif /* __SOUND_PCM_H */
1453