1 #ifndef __SOUND_PCM_H 2 #define __SOUND_PCM_H 3 4 /* 5 * Digital Audio (PCM) abstract layer 6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 7 * Abramo Bagnara <abramo@alsa-project.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26 #include <sound/asound.h> 27 #include <sound/memalloc.h> 28 #include <sound/minors.h> 29 #include <linux/poll.h> 30 #include <linux/mm.h> 31 #include <linux/bitops.h> 32 #include <linux/pm_qos.h> 33 34 #define snd_pcm_substream_chip(substream) ((substream)->private_data) 35 #define snd_pcm_chip(pcm) ((pcm)->private_data) 36 37 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 38 #include <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_ops { 64 int (*open)(struct snd_pcm_substream *substream); 65 int (*close)(struct snd_pcm_substream *substream); 66 int (*ioctl)(struct snd_pcm_substream * substream, 67 unsigned int cmd, void *arg); 68 int (*hw_params)(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params *params); 70 int (*hw_free)(struct snd_pcm_substream *substream); 71 int (*prepare)(struct snd_pcm_substream *substream); 72 int (*trigger)(struct snd_pcm_substream *substream, int cmd); 73 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); 74 int (*copy)(struct snd_pcm_substream *substream, int channel, 75 snd_pcm_uframes_t pos, 76 void __user *buf, snd_pcm_uframes_t count); 77 int (*silence)(struct snd_pcm_substream *substream, int channel, 78 snd_pcm_uframes_t pos, snd_pcm_uframes_t count); 79 struct page *(*page)(struct snd_pcm_substream *substream, 80 unsigned long offset); 81 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); 82 int (*ack)(struct snd_pcm_substream *substream); 83 }; 84 85 /* 86 * 87 */ 88 89 #if defined(CONFIG_SND_DYNAMIC_MINORS) 90 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2) 91 #else 92 #define SNDRV_PCM_DEVICES 8 93 #endif 94 95 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0) 96 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1) 97 98 #define SNDRV_PCM_IOCTL1_RESET 0 99 #define SNDRV_PCM_IOCTL1_INFO 1 100 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 101 #define SNDRV_PCM_IOCTL1_GSTATE 3 102 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4 103 104 #define SNDRV_PCM_TRIGGER_STOP 0 105 #define SNDRV_PCM_TRIGGER_START 1 106 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 107 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 108 #define SNDRV_PCM_TRIGGER_SUSPEND 5 109 #define SNDRV_PCM_TRIGGER_RESUME 6 110 111 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) 112 113 /* If you change this don't forget to change rates[] table in pcm_native.c */ 114 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */ 115 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */ 116 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */ 117 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */ 118 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */ 119 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */ 120 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */ 121 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */ 122 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */ 123 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */ 124 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */ 125 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */ 126 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */ 127 128 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */ 129 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */ 130 131 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ 132 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ 133 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) 134 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) 135 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ 136 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) 137 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ 138 SNDRV_PCM_RATE_192000) 139 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt) 140 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8) 141 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8) 142 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE) 143 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE) 144 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE) 145 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE) 146 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE) 147 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE) 148 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE) 149 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE) 150 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE) 151 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE) 152 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE) 153 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE) 154 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE) 155 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE) 156 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE) 157 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE) 158 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE) 159 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE) 160 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW) 161 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW) 162 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM) 163 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG) 164 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM) 165 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL) 166 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE) 167 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE) 168 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE) 169 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE) 170 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE) 171 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE) 172 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE) 173 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE) 174 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE) 175 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE) 176 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE) 177 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE) 178 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24) 179 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B) 180 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40) 181 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B) 182 183 #ifdef SNDRV_LITTLE_ENDIAN 184 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 185 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 186 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 187 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 188 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 189 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 190 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 191 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 192 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 193 #endif 194 #ifdef SNDRV_BIG_ENDIAN 195 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 196 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 197 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 198 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 199 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 200 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 201 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 202 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 203 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 204 #endif 205 206 struct snd_pcm_file { 207 struct snd_pcm_substream *substream; 208 int no_compat_mmap; 209 }; 210 211 struct snd_pcm_hw_rule; 212 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 213 struct snd_pcm_hw_rule *rule); 214 215 struct snd_pcm_hw_rule { 216 unsigned int cond; 217 snd_pcm_hw_rule_func_t func; 218 int var; 219 int deps[4]; 220 void *private; 221 }; 222 223 struct snd_pcm_hw_constraints { 224 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 225 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 226 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 227 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 228 unsigned int rules_num; 229 unsigned int rules_all; 230 struct snd_pcm_hw_rule *rules; 231 }; 232 233 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 234 snd_pcm_hw_param_t var) 235 { 236 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 237 } 238 239 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 240 snd_pcm_hw_param_t var) 241 { 242 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 243 } 244 245 struct snd_ratnum { 246 unsigned int num; 247 unsigned int den_min, den_max, den_step; 248 }; 249 250 struct snd_ratden { 251 unsigned int num_min, num_max, num_step; 252 unsigned int den; 253 }; 254 255 struct snd_pcm_hw_constraint_ratnums { 256 int nrats; 257 struct snd_ratnum *rats; 258 }; 259 260 struct snd_pcm_hw_constraint_ratdens { 261 int nrats; 262 struct snd_ratden *rats; 263 }; 264 265 struct snd_pcm_hw_constraint_list { 266 unsigned int count; 267 const unsigned int *list; 268 unsigned int mask; 269 }; 270 271 struct snd_pcm_hwptr_log; 272 273 struct snd_pcm_runtime { 274 /* -- Status -- */ 275 struct snd_pcm_substream *trigger_master; 276 struct timespec trigger_tstamp; /* trigger timestamp */ 277 int overrange; 278 snd_pcm_uframes_t avail_max; 279 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 280 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ 281 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ 282 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */ 283 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */ 284 285 /* -- HW params -- */ 286 snd_pcm_access_t access; /* access mode */ 287 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 288 snd_pcm_subformat_t subformat; /* subformat */ 289 unsigned int rate; /* rate in Hz */ 290 unsigned int channels; /* channels */ 291 snd_pcm_uframes_t period_size; /* period size */ 292 unsigned int periods; /* periods */ 293 snd_pcm_uframes_t buffer_size; /* buffer size */ 294 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 295 size_t byte_align; 296 unsigned int frame_bits; 297 unsigned int sample_bits; 298 unsigned int info; 299 unsigned int rate_num; 300 unsigned int rate_den; 301 unsigned int no_period_wakeup: 1; 302 303 /* -- SW params -- */ 304 int tstamp_mode; /* mmap timestamp is updated */ 305 unsigned int period_step; 306 snd_pcm_uframes_t start_threshold; 307 snd_pcm_uframes_t stop_threshold; 308 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 309 noise is nearest than this */ 310 snd_pcm_uframes_t silence_size; /* Silence filling size */ 311 snd_pcm_uframes_t boundary; /* pointers wrap point */ 312 313 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 314 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 315 316 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 317 318 /* -- mmap -- */ 319 struct snd_pcm_mmap_status *status; 320 struct snd_pcm_mmap_control *control; 321 322 /* -- locking / scheduling -- */ 323 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ 324 wait_queue_head_t sleep; /* poll sleep */ 325 wait_queue_head_t tsleep; /* transfer sleep */ 326 struct fasync_struct *fasync; 327 328 /* -- private section -- */ 329 void *private_data; 330 void (*private_free)(struct snd_pcm_runtime *runtime); 331 332 /* -- hardware description -- */ 333 struct snd_pcm_hardware hw; 334 struct snd_pcm_hw_constraints hw_constraints; 335 336 /* -- interrupt callbacks -- */ 337 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 338 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 339 340 /* -- timer -- */ 341 unsigned int timer_resolution; /* timer resolution */ 342 int tstamp_type; /* timestamp type */ 343 344 /* -- DMA -- */ 345 unsigned char *dma_area; /* DMA area */ 346 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 347 size_t dma_bytes; /* size of DMA area */ 348 349 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 350 351 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 352 /* -- OSS things -- */ 353 struct snd_pcm_oss_runtime oss; 354 #endif 355 356 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 357 struct snd_pcm_hwptr_log *hwptr_log; 358 #endif 359 }; 360 361 struct snd_pcm_group { /* keep linked substreams */ 362 spinlock_t lock; 363 struct list_head substreams; 364 int count; 365 }; 366 367 struct pid; 368 369 struct snd_pcm_substream { 370 struct snd_pcm *pcm; 371 struct snd_pcm_str *pstr; 372 void *private_data; /* copied from pcm->private_data */ 373 int number; 374 char name[32]; /* substream name */ 375 int stream; /* stream (direction) */ 376 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ 377 size_t buffer_bytes_max; /* limit ring buffer size */ 378 struct snd_dma_buffer dma_buffer; 379 unsigned int dma_buf_id; 380 size_t dma_max; 381 /* -- hardware operations -- */ 382 struct snd_pcm_ops *ops; 383 /* -- runtime information -- */ 384 struct snd_pcm_runtime *runtime; 385 /* -- timer section -- */ 386 struct snd_timer *timer; /* timer */ 387 unsigned timer_running: 1; /* time is running */ 388 /* -- next substream -- */ 389 struct snd_pcm_substream *next; 390 /* -- linked substreams -- */ 391 struct list_head link_list; /* linked list member */ 392 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 393 struct snd_pcm_group *group; /* pointer to current group */ 394 /* -- assigned files -- */ 395 void *file; 396 int ref_count; 397 atomic_t mmap_count; 398 unsigned int f_flags; 399 void (*pcm_release)(struct snd_pcm_substream *); 400 struct pid *pid; 401 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 402 /* -- OSS things -- */ 403 struct snd_pcm_oss_substream oss; 404 #endif 405 #ifdef CONFIG_SND_VERBOSE_PROCFS 406 struct snd_info_entry *proc_root; 407 struct snd_info_entry *proc_info_entry; 408 struct snd_info_entry *proc_hw_params_entry; 409 struct snd_info_entry *proc_sw_params_entry; 410 struct snd_info_entry *proc_status_entry; 411 struct snd_info_entry *proc_prealloc_entry; 412 struct snd_info_entry *proc_prealloc_max_entry; 413 #endif 414 /* misc flags */ 415 unsigned int hw_opened: 1; 416 }; 417 418 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 419 420 421 struct snd_pcm_str { 422 int stream; /* stream (direction) */ 423 struct snd_pcm *pcm; 424 /* -- substreams -- */ 425 unsigned int substream_count; 426 unsigned int substream_opened; 427 struct snd_pcm_substream *substream; 428 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 429 /* -- OSS things -- */ 430 struct snd_pcm_oss_stream oss; 431 #endif 432 #ifdef CONFIG_SND_VERBOSE_PROCFS 433 struct snd_info_entry *proc_root; 434 struct snd_info_entry *proc_info_entry; 435 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 436 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 437 struct snd_info_entry *proc_xrun_debug_entry; 438 #endif 439 #endif 440 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ 441 }; 442 443 struct snd_pcm { 444 struct snd_card *card; 445 struct list_head list; 446 int device; /* device number */ 447 unsigned int info_flags; 448 unsigned short dev_class; 449 unsigned short dev_subclass; 450 char id[64]; 451 char name[80]; 452 struct snd_pcm_str streams[2]; 453 struct mutex open_mutex; 454 wait_queue_head_t open_wait; 455 void *private_data; 456 void (*private_free) (struct snd_pcm *pcm); 457 struct device *dev; /* actual hw device this belongs to */ 458 bool internal; /* pcm is for internal use only */ 459 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 460 struct snd_pcm_oss oss; 461 #endif 462 }; 463 464 struct snd_pcm_notify { 465 int (*n_register) (struct snd_pcm * pcm); 466 int (*n_disconnect) (struct snd_pcm * pcm); 467 int (*n_unregister) (struct snd_pcm * pcm); 468 struct list_head list; 469 }; 470 471 /* 472 * Registering 473 */ 474 475 extern const struct file_operations snd_pcm_f_ops[2]; 476 477 int snd_pcm_new(struct snd_card *card, const char *id, int device, 478 int playback_count, int capture_count, 479 struct snd_pcm **rpcm); 480 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 481 int playback_count, int capture_count, 482 struct snd_pcm **rpcm); 483 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 484 485 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 486 487 /* 488 * Native I/O 489 */ 490 491 extern rwlock_t snd_pcm_link_rwlock; 492 493 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 494 int snd_pcm_info_user(struct snd_pcm_substream *substream, 495 struct snd_pcm_info __user *info); 496 int snd_pcm_status(struct snd_pcm_substream *substream, 497 struct snd_pcm_status *status); 498 int snd_pcm_start(struct snd_pcm_substream *substream); 499 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 500 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 501 #ifdef CONFIG_PM 502 int snd_pcm_suspend(struct snd_pcm_substream *substream); 503 int snd_pcm_suspend_all(struct snd_pcm *pcm); 504 #endif 505 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 506 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 507 struct snd_pcm_substream **rsubstream); 508 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 509 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 510 struct snd_pcm_substream **rsubstream); 511 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 512 void snd_pcm_vma_notify_data(void *client, void *data); 513 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 514 515 516 #ifdef CONFIG_SND_DEBUG 517 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 518 char *name, size_t len); 519 #else 520 static inline void 521 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 522 { 523 *buf = 0; 524 } 525 #endif 526 527 /* 528 * PCM library 529 */ 530 531 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 532 { 533 return substream->group != &substream->self_group; 534 } 535 536 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 537 { 538 read_lock(&snd_pcm_link_rwlock); 539 spin_lock(&substream->self_group.lock); 540 } 541 542 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 543 { 544 spin_unlock(&substream->self_group.lock); 545 read_unlock(&snd_pcm_link_rwlock); 546 } 547 548 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 549 { 550 read_lock_irq(&snd_pcm_link_rwlock); 551 spin_lock(&substream->self_group.lock); 552 } 553 554 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 555 { 556 spin_unlock(&substream->self_group.lock); 557 read_unlock_irq(&snd_pcm_link_rwlock); 558 } 559 560 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 561 do { \ 562 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 563 spin_lock(&substream->self_group.lock); \ 564 } while (0) 565 566 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 567 do { \ 568 spin_unlock(&substream->self_group.lock); \ 569 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 570 } while (0) 571 572 #define snd_pcm_group_for_each_entry(s, substream) \ 573 list_for_each_entry(s, &substream->group->substreams, link_list) 574 575 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 576 { 577 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 578 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 579 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 580 } 581 582 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 583 { 584 return size * 8 / runtime->sample_bits; 585 } 586 587 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 588 { 589 return size * 8 / runtime->frame_bits; 590 } 591 592 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 593 { 594 return size * runtime->sample_bits / 8; 595 } 596 597 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 598 { 599 return size * runtime->frame_bits / 8; 600 } 601 602 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 603 { 604 return bytes % runtime->byte_align == 0; 605 } 606 607 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 608 { 609 struct snd_pcm_runtime *runtime = substream->runtime; 610 return frames_to_bytes(runtime, runtime->buffer_size); 611 } 612 613 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 614 { 615 struct snd_pcm_runtime *runtime = substream->runtime; 616 return frames_to_bytes(runtime, runtime->period_size); 617 } 618 619 /* 620 * result is: 0 ... (boundary - 1) 621 */ 622 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 623 { 624 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 625 if (avail < 0) 626 avail += runtime->boundary; 627 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 628 avail -= runtime->boundary; 629 return avail; 630 } 631 632 /* 633 * result is: 0 ... (boundary - 1) 634 */ 635 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 636 { 637 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 638 if (avail < 0) 639 avail += runtime->boundary; 640 return avail; 641 } 642 643 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 644 { 645 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 646 } 647 648 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 649 { 650 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 651 } 652 653 /** 654 * snd_pcm_playback_ready - check whether the playback buffer is available 655 * @substream: the pcm substream instance 656 * 657 * Checks whether enough free space is available on the playback buffer. 658 * 659 * Returns non-zero if available, or zero if not. 660 */ 661 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 662 { 663 struct snd_pcm_runtime *runtime = substream->runtime; 664 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 665 } 666 667 /** 668 * snd_pcm_capture_ready - check whether the capture buffer is available 669 * @substream: the pcm substream instance 670 * 671 * Checks whether enough capture data is available on the capture buffer. 672 * 673 * Returns non-zero if available, or zero if not. 674 */ 675 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 676 { 677 struct snd_pcm_runtime *runtime = substream->runtime; 678 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 679 } 680 681 /** 682 * snd_pcm_playback_data - check whether any data exists on the playback buffer 683 * @substream: the pcm substream instance 684 * 685 * Checks whether any data exists on the playback buffer. If stop_threshold 686 * is bigger or equal to boundary, then this function returns always non-zero. 687 * 688 * Returns non-zero if exists, or zero if not. 689 */ 690 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 691 { 692 struct snd_pcm_runtime *runtime = substream->runtime; 693 694 if (runtime->stop_threshold >= runtime->boundary) 695 return 1; 696 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 697 } 698 699 /** 700 * snd_pcm_playback_empty - check whether the playback buffer is empty 701 * @substream: the pcm substream instance 702 * 703 * Checks whether the playback buffer is empty. 704 * 705 * Returns non-zero if empty, or zero if not. 706 */ 707 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 708 { 709 struct snd_pcm_runtime *runtime = substream->runtime; 710 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 711 } 712 713 /** 714 * snd_pcm_capture_empty - check whether the capture buffer is empty 715 * @substream: the pcm substream instance 716 * 717 * Checks whether the capture buffer is empty. 718 * 719 * Returns non-zero if empty, or zero if not. 720 */ 721 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 722 { 723 struct snd_pcm_runtime *runtime = substream->runtime; 724 return snd_pcm_capture_avail(runtime) == 0; 725 } 726 727 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 728 struct snd_pcm_substream *master) 729 { 730 substream->runtime->trigger_master = master; 731 } 732 733 static inline int hw_is_mask(int var) 734 { 735 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 736 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 737 } 738 739 static inline int hw_is_interval(int var) 740 { 741 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 742 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 743 } 744 745 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 746 snd_pcm_hw_param_t var) 747 { 748 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 749 } 750 751 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 752 snd_pcm_hw_param_t var) 753 { 754 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 755 } 756 757 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 758 snd_pcm_hw_param_t var) 759 { 760 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 761 } 762 763 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 764 snd_pcm_hw_param_t var) 765 { 766 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 767 } 768 769 #define params_channels(p) \ 770 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min) 771 #define params_rate(p) \ 772 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min) 773 #define params_period_size(p) \ 774 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min) 775 #define params_periods(p) \ 776 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min) 777 #define params_buffer_size(p) \ 778 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min) 779 #define params_buffer_bytes(p) \ 780 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min) 781 782 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 783 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 784 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 785 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 786 unsigned int k, struct snd_interval *c); 787 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 788 const struct snd_interval *b, struct snd_interval *c); 789 int snd_interval_list(struct snd_interval *i, unsigned int count, 790 const unsigned int *list, unsigned int mask); 791 int snd_interval_ratnum(struct snd_interval *i, 792 unsigned int rats_count, struct snd_ratnum *rats, 793 unsigned int *nump, unsigned int *denp); 794 795 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 796 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 797 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 798 799 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 800 801 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 802 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 803 804 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 805 u_int32_t mask); 806 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 807 u_int64_t mask); 808 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 809 unsigned int min, unsigned int max); 810 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 811 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 812 unsigned int cond, 813 snd_pcm_hw_param_t var, 814 const struct snd_pcm_hw_constraint_list *l); 815 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 816 unsigned int cond, 817 snd_pcm_hw_param_t var, 818 struct snd_pcm_hw_constraint_ratnums *r); 819 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 820 unsigned int cond, 821 snd_pcm_hw_param_t var, 822 struct snd_pcm_hw_constraint_ratdens *r); 823 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 824 unsigned int cond, 825 unsigned int width, 826 unsigned int msbits); 827 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 828 unsigned int cond, 829 snd_pcm_hw_param_t var, 830 unsigned long step); 831 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 832 unsigned int cond, 833 snd_pcm_hw_param_t var); 834 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 835 unsigned int base_rate); 836 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 837 unsigned int cond, 838 int var, 839 snd_pcm_hw_rule_func_t func, void *private, 840 int dep, ...); 841 842 int snd_pcm_format_signed(snd_pcm_format_t format); 843 int snd_pcm_format_unsigned(snd_pcm_format_t format); 844 int snd_pcm_format_linear(snd_pcm_format_t format); 845 int snd_pcm_format_little_endian(snd_pcm_format_t format); 846 int snd_pcm_format_big_endian(snd_pcm_format_t format); 847 #if 0 /* just for DocBook */ 848 /** 849 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 850 * @format: the format to check 851 * 852 * Returns 1 if the given PCM format is CPU-endian, 0 if 853 * opposite, or a negative error code if endian not specified. 854 */ 855 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 856 #endif /* DocBook */ 857 #ifdef SNDRV_LITTLE_ENDIAN 858 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 859 #else 860 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 861 #endif 862 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 863 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 864 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 865 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 866 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 867 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 868 869 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 870 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 871 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 872 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 873 unsigned int cmd, void *arg); 874 int snd_pcm_update_state(struct snd_pcm_substream *substream, 875 struct snd_pcm_runtime *runtime); 876 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 877 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 878 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 879 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 880 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 881 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 882 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 883 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 884 const void __user *buf, 885 snd_pcm_uframes_t frames); 886 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 887 void __user *buf, snd_pcm_uframes_t frames); 888 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 889 void __user **bufs, snd_pcm_uframes_t frames); 890 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 891 void __user **bufs, snd_pcm_uframes_t frames); 892 893 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 894 895 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 896 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 897 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 898 899 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 900 struct snd_dma_buffer *bufp) 901 { 902 struct snd_pcm_runtime *runtime = substream->runtime; 903 if (bufp) { 904 runtime->dma_buffer_p = bufp; 905 runtime->dma_area = bufp->area; 906 runtime->dma_addr = bufp->addr; 907 runtime->dma_bytes = bufp->bytes; 908 } else { 909 runtime->dma_buffer_p = NULL; 910 runtime->dma_area = NULL; 911 runtime->dma_addr = 0; 912 runtime->dma_bytes = 0; 913 } 914 } 915 916 /* 917 * Timer interface 918 */ 919 920 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 921 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 922 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 923 924 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 925 struct timespec *tv) 926 { 927 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 928 do_posix_clock_monotonic_gettime(tv); 929 else 930 getnstimeofday(tv); 931 } 932 933 /* 934 * Memory 935 */ 936 937 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 938 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 939 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 940 int type, struct device *data, 941 size_t size, size_t max); 942 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 943 int type, void *data, 944 size_t size, size_t max); 945 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 946 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 947 948 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 949 size_t size, gfp_t gfp_flags); 950 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 951 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 952 unsigned long offset); 953 #if 0 /* for kernel-doc */ 954 /** 955 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 956 * @substream: the substream to allocate the buffer to 957 * @size: the requested buffer size, in bytes 958 * 959 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 960 * contiguous in kernel virtual space, but not in physical memory. Use this 961 * if the buffer is accessed by kernel code but not by device DMA. 962 * 963 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error 964 * code. 965 */ 966 static int snd_pcm_lib_alloc_vmalloc_buffer 967 (struct snd_pcm_substream *substream, size_t size); 968 /** 969 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 970 * @substream: the substream to allocate the buffer to 971 * @size: the requested buffer size, in bytes 972 * 973 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 974 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 975 */ 976 static int snd_pcm_lib_alloc_vmalloc_32_buffer 977 (struct snd_pcm_substream *substream, size_t size); 978 #endif 979 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \ 980 _snd_pcm_lib_alloc_vmalloc_buffer \ 981 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO) 982 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \ 983 _snd_pcm_lib_alloc_vmalloc_buffer \ 984 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO) 985 986 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 987 988 #ifdef CONFIG_SND_DMA_SGBUF 989 /* 990 * SG-buffer handling 991 */ 992 #define snd_pcm_substream_sgbuf(substream) \ 993 snd_pcm_get_dma_buf(substream)->private_data 994 995 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 996 unsigned long offset); 997 #else /* !SND_DMA_SGBUF */ 998 /* 999 * fake using a continuous buffer 1000 */ 1001 #define snd_pcm_sgbuf_ops_page NULL 1002 #endif /* SND_DMA_SGBUF */ 1003 1004 static inline dma_addr_t 1005 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1006 { 1007 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1008 } 1009 1010 static inline void * 1011 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 1012 { 1013 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs); 1014 } 1015 1016 static inline unsigned int 1017 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1018 unsigned int ofs, unsigned int size) 1019 { 1020 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1021 } 1022 1023 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1024 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1025 { 1026 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1027 atomic_inc(&substream->mmap_count); 1028 } 1029 1030 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1031 { 1032 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1033 atomic_dec(&substream->mmap_count); 1034 } 1035 1036 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1037 struct vm_area_struct *area); 1038 /* mmap for io-memory area */ 1039 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1040 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1041 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1042 #else 1043 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1044 #define snd_pcm_lib_mmap_iomem NULL 1045 #endif 1046 1047 #define snd_pcm_lib_mmap_vmalloc NULL 1048 1049 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1050 { 1051 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1052 } 1053 1054 /* 1055 * Misc 1056 */ 1057 1058 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1059 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1060 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1061 (IEC958_AES3_CON_FS_48000<<24)) 1062 1063 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1064 1065 const char *snd_pcm_format_name(snd_pcm_format_t format); 1066 1067 /** 1068 * snd_pcm_stream_str - Get a string naming the direction of a stream 1069 * @substream: the pcm substream instance 1070 */ 1071 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1072 { 1073 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1074 return "Playback"; 1075 else 1076 return "Capture"; 1077 } 1078 1079 /* 1080 * PCM channel-mapping control API 1081 */ 1082 /* array element of channel maps */ 1083 struct snd_pcm_chmap_elem { 1084 unsigned char channels; 1085 unsigned char map[15]; 1086 }; 1087 1088 /* channel map information; retrieved via snd_kcontrol_chip() */ 1089 struct snd_pcm_chmap { 1090 struct snd_pcm *pcm; /* assigned PCM instance */ 1091 int stream; /* PLAYBACK or CAPTURE */ 1092 struct snd_kcontrol *kctl; 1093 const struct snd_pcm_chmap_elem *chmap; 1094 unsigned int max_channels; 1095 unsigned int channel_mask; /* optional: active channels bitmask */ 1096 void *private_data; /* optional: private data pointer */ 1097 }; 1098 1099 /* get the PCM substream assigned to the given chmap info */ 1100 static inline struct snd_pcm_substream * 1101 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1102 { 1103 struct snd_pcm_substream *s; 1104 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1105 if (s->number == idx) 1106 return s; 1107 return NULL; 1108 } 1109 1110 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1111 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1112 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1113 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1114 1115 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1116 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1117 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1118 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1119 1120 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1121 const struct snd_pcm_chmap_elem *chmap, 1122 int max_channels, 1123 unsigned long private_value, 1124 struct snd_pcm_chmap **info_ret); 1125 1126 #endif /* __SOUND_PCM_H */ 1127