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 (*wall_clock)(struct snd_pcm_substream *substream, 75 struct timespec *audio_ts); 76 int (*copy)(struct snd_pcm_substream *substream, int channel, 77 snd_pcm_uframes_t pos, 78 void __user *buf, snd_pcm_uframes_t count); 79 int (*silence)(struct snd_pcm_substream *substream, int channel, 80 snd_pcm_uframes_t pos, snd_pcm_uframes_t count); 81 struct page *(*page)(struct snd_pcm_substream *substream, 82 unsigned long offset); 83 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); 84 int (*ack)(struct snd_pcm_substream *substream); 85 }; 86 87 /* 88 * 89 */ 90 91 #if defined(CONFIG_SND_DYNAMIC_MINORS) 92 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2) 93 #else 94 #define SNDRV_PCM_DEVICES 8 95 #endif 96 97 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0) 98 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1) 99 100 #define SNDRV_PCM_IOCTL1_RESET 0 101 #define SNDRV_PCM_IOCTL1_INFO 1 102 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 103 #define SNDRV_PCM_IOCTL1_GSTATE 3 104 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4 105 106 #define SNDRV_PCM_TRIGGER_STOP 0 107 #define SNDRV_PCM_TRIGGER_START 1 108 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 109 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 110 #define SNDRV_PCM_TRIGGER_SUSPEND 5 111 #define SNDRV_PCM_TRIGGER_RESUME 6 112 113 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) 114 115 /* If you change this don't forget to change rates[] table in pcm_native.c */ 116 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */ 117 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */ 118 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */ 119 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */ 120 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */ 121 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */ 122 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */ 123 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */ 124 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */ 125 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */ 126 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */ 127 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */ 128 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */ 129 130 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */ 131 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */ 132 133 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ 134 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ 135 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) 136 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) 137 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ 138 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) 139 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ 140 SNDRV_PCM_RATE_192000) 141 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt) 142 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8) 143 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8) 144 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE) 145 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE) 146 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE) 147 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE) 148 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE) 149 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE) 150 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE) 151 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE) 152 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE) 153 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE) 154 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE) 155 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE) 156 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE) 157 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE) 158 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE) 159 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE) 160 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE) 161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE) 162 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW) 163 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW) 164 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM) 165 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG) 166 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM) 167 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL) 168 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE) 169 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE) 170 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE) 171 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE) 172 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE) 173 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE) 174 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE) 175 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE) 176 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE) 177 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE) 178 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE) 179 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE) 180 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24) 181 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B) 182 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40) 183 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B) 184 185 #ifdef SNDRV_LITTLE_ENDIAN 186 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 187 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 188 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 189 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 190 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 191 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 192 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 193 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 194 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 195 #endif 196 #ifdef SNDRV_BIG_ENDIAN 197 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 198 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 199 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 200 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 201 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 202 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 203 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 204 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 205 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 206 #endif 207 208 struct snd_pcm_file { 209 struct snd_pcm_substream *substream; 210 int no_compat_mmap; 211 }; 212 213 struct snd_pcm_hw_rule; 214 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 215 struct snd_pcm_hw_rule *rule); 216 217 struct snd_pcm_hw_rule { 218 unsigned int cond; 219 snd_pcm_hw_rule_func_t func; 220 int var; 221 int deps[4]; 222 void *private; 223 }; 224 225 struct snd_pcm_hw_constraints { 226 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 227 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 228 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 229 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 230 unsigned int rules_num; 231 unsigned int rules_all; 232 struct snd_pcm_hw_rule *rules; 233 }; 234 235 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 236 snd_pcm_hw_param_t var) 237 { 238 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 239 } 240 241 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 242 snd_pcm_hw_param_t var) 243 { 244 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 245 } 246 247 struct snd_ratnum { 248 unsigned int num; 249 unsigned int den_min, den_max, den_step; 250 }; 251 252 struct snd_ratden { 253 unsigned int num_min, num_max, num_step; 254 unsigned int den; 255 }; 256 257 struct snd_pcm_hw_constraint_ratnums { 258 int nrats; 259 struct snd_ratnum *rats; 260 }; 261 262 struct snd_pcm_hw_constraint_ratdens { 263 int nrats; 264 struct snd_ratden *rats; 265 }; 266 267 struct snd_pcm_hw_constraint_list { 268 unsigned int count; 269 const unsigned int *list; 270 unsigned int mask; 271 }; 272 273 struct snd_pcm_hwptr_log; 274 275 struct snd_pcm_runtime { 276 /* -- Status -- */ 277 struct snd_pcm_substream *trigger_master; 278 struct timespec trigger_tstamp; /* trigger timestamp */ 279 int overrange; 280 snd_pcm_uframes_t avail_max; 281 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 282 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ 283 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ 284 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */ 285 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */ 286 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */ 287 288 /* -- HW params -- */ 289 snd_pcm_access_t access; /* access mode */ 290 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 291 snd_pcm_subformat_t subformat; /* subformat */ 292 unsigned int rate; /* rate in Hz */ 293 unsigned int channels; /* channels */ 294 snd_pcm_uframes_t period_size; /* period size */ 295 unsigned int periods; /* periods */ 296 snd_pcm_uframes_t buffer_size; /* buffer size */ 297 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 298 size_t byte_align; 299 unsigned int frame_bits; 300 unsigned int sample_bits; 301 unsigned int info; 302 unsigned int rate_num; 303 unsigned int rate_den; 304 unsigned int no_period_wakeup: 1; 305 306 /* -- SW params -- */ 307 int tstamp_mode; /* mmap timestamp is updated */ 308 unsigned int period_step; 309 snd_pcm_uframes_t start_threshold; 310 snd_pcm_uframes_t stop_threshold; 311 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 312 noise is nearest than this */ 313 snd_pcm_uframes_t silence_size; /* Silence filling size */ 314 snd_pcm_uframes_t boundary; /* pointers wrap point */ 315 316 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 317 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 318 319 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 320 321 /* -- mmap -- */ 322 struct snd_pcm_mmap_status *status; 323 struct snd_pcm_mmap_control *control; 324 325 /* -- locking / scheduling -- */ 326 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ 327 wait_queue_head_t sleep; /* poll sleep */ 328 wait_queue_head_t tsleep; /* transfer sleep */ 329 struct fasync_struct *fasync; 330 331 /* -- private section -- */ 332 void *private_data; 333 void (*private_free)(struct snd_pcm_runtime *runtime); 334 335 /* -- hardware description -- */ 336 struct snd_pcm_hardware hw; 337 struct snd_pcm_hw_constraints hw_constraints; 338 339 /* -- interrupt callbacks -- */ 340 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 341 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 342 343 /* -- timer -- */ 344 unsigned int timer_resolution; /* timer resolution */ 345 int tstamp_type; /* timestamp type */ 346 347 /* -- DMA -- */ 348 unsigned char *dma_area; /* DMA area */ 349 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 350 size_t dma_bytes; /* size of DMA area */ 351 352 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 353 354 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 355 /* -- OSS things -- */ 356 struct snd_pcm_oss_runtime oss; 357 #endif 358 359 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 360 struct snd_pcm_hwptr_log *hwptr_log; 361 #endif 362 }; 363 364 struct snd_pcm_group { /* keep linked substreams */ 365 spinlock_t lock; 366 struct list_head substreams; 367 int count; 368 }; 369 370 struct pid; 371 372 struct snd_pcm_substream { 373 struct snd_pcm *pcm; 374 struct snd_pcm_str *pstr; 375 void *private_data; /* copied from pcm->private_data */ 376 int number; 377 char name[32]; /* substream name */ 378 int stream; /* stream (direction) */ 379 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ 380 size_t buffer_bytes_max; /* limit ring buffer size */ 381 struct snd_dma_buffer dma_buffer; 382 unsigned int dma_buf_id; 383 size_t dma_max; 384 /* -- hardware operations -- */ 385 struct snd_pcm_ops *ops; 386 /* -- runtime information -- */ 387 struct snd_pcm_runtime *runtime; 388 /* -- timer section -- */ 389 struct snd_timer *timer; /* timer */ 390 unsigned timer_running: 1; /* time is running */ 391 /* -- next substream -- */ 392 struct snd_pcm_substream *next; 393 /* -- linked substreams -- */ 394 struct list_head link_list; /* linked list member */ 395 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 396 struct snd_pcm_group *group; /* pointer to current group */ 397 /* -- assigned files -- */ 398 void *file; 399 int ref_count; 400 atomic_t mmap_count; 401 unsigned int f_flags; 402 void (*pcm_release)(struct snd_pcm_substream *); 403 struct pid *pid; 404 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 405 /* -- OSS things -- */ 406 struct snd_pcm_oss_substream oss; 407 #endif 408 #ifdef CONFIG_SND_VERBOSE_PROCFS 409 struct snd_info_entry *proc_root; 410 struct snd_info_entry *proc_info_entry; 411 struct snd_info_entry *proc_hw_params_entry; 412 struct snd_info_entry *proc_sw_params_entry; 413 struct snd_info_entry *proc_status_entry; 414 struct snd_info_entry *proc_prealloc_entry; 415 struct snd_info_entry *proc_prealloc_max_entry; 416 #endif 417 /* misc flags */ 418 unsigned int hw_opened: 1; 419 }; 420 421 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 422 423 424 struct snd_pcm_str { 425 int stream; /* stream (direction) */ 426 struct snd_pcm *pcm; 427 /* -- substreams -- */ 428 unsigned int substream_count; 429 unsigned int substream_opened; 430 struct snd_pcm_substream *substream; 431 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 432 /* -- OSS things -- */ 433 struct snd_pcm_oss_stream oss; 434 #endif 435 #ifdef CONFIG_SND_VERBOSE_PROCFS 436 struct snd_info_entry *proc_root; 437 struct snd_info_entry *proc_info_entry; 438 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 439 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 440 struct snd_info_entry *proc_xrun_debug_entry; 441 #endif 442 #endif 443 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ 444 }; 445 446 struct snd_pcm { 447 struct snd_card *card; 448 struct list_head list; 449 int device; /* device number */ 450 unsigned int info_flags; 451 unsigned short dev_class; 452 unsigned short dev_subclass; 453 char id[64]; 454 char name[80]; 455 struct snd_pcm_str streams[2]; 456 struct mutex open_mutex; 457 wait_queue_head_t open_wait; 458 void *private_data; 459 void (*private_free) (struct snd_pcm *pcm); 460 struct device *dev; /* actual hw device this belongs to */ 461 bool internal; /* pcm is for internal use only */ 462 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 463 struct snd_pcm_oss oss; 464 #endif 465 }; 466 467 struct snd_pcm_notify { 468 int (*n_register) (struct snd_pcm * pcm); 469 int (*n_disconnect) (struct snd_pcm * pcm); 470 int (*n_unregister) (struct snd_pcm * pcm); 471 struct list_head list; 472 }; 473 474 /* 475 * Registering 476 */ 477 478 extern const struct file_operations snd_pcm_f_ops[2]; 479 480 int snd_pcm_new(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_internal(struct snd_card *card, const char *id, int device, 484 int playback_count, int capture_count, 485 struct snd_pcm **rpcm); 486 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 487 488 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 489 490 /* 491 * Native I/O 492 */ 493 494 extern rwlock_t snd_pcm_link_rwlock; 495 496 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 497 int snd_pcm_info_user(struct snd_pcm_substream *substream, 498 struct snd_pcm_info __user *info); 499 int snd_pcm_status(struct snd_pcm_substream *substream, 500 struct snd_pcm_status *status); 501 int snd_pcm_start(struct snd_pcm_substream *substream); 502 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 503 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 504 #ifdef CONFIG_PM 505 int snd_pcm_suspend(struct snd_pcm_substream *substream); 506 int snd_pcm_suspend_all(struct snd_pcm *pcm); 507 #endif 508 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 509 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 510 struct snd_pcm_substream **rsubstream); 511 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 512 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 513 struct snd_pcm_substream **rsubstream); 514 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 515 void snd_pcm_vma_notify_data(void *client, void *data); 516 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 517 518 519 #ifdef CONFIG_SND_DEBUG 520 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 521 char *name, size_t len); 522 #else 523 static inline void 524 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 525 { 526 *buf = 0; 527 } 528 #endif 529 530 /* 531 * PCM library 532 */ 533 534 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 535 { 536 return substream->group != &substream->self_group; 537 } 538 539 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 540 { 541 read_lock(&snd_pcm_link_rwlock); 542 spin_lock(&substream->self_group.lock); 543 } 544 545 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 546 { 547 spin_unlock(&substream->self_group.lock); 548 read_unlock(&snd_pcm_link_rwlock); 549 } 550 551 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 552 { 553 read_lock_irq(&snd_pcm_link_rwlock); 554 spin_lock(&substream->self_group.lock); 555 } 556 557 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 558 { 559 spin_unlock(&substream->self_group.lock); 560 read_unlock_irq(&snd_pcm_link_rwlock); 561 } 562 563 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 564 do { \ 565 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 566 spin_lock(&substream->self_group.lock); \ 567 } while (0) 568 569 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 570 do { \ 571 spin_unlock(&substream->self_group.lock); \ 572 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 573 } while (0) 574 575 #define snd_pcm_group_for_each_entry(s, substream) \ 576 list_for_each_entry(s, &substream->group->substreams, link_list) 577 578 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 579 { 580 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 581 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 582 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 583 } 584 585 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 586 { 587 return size * 8 / runtime->sample_bits; 588 } 589 590 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 591 { 592 return size * 8 / runtime->frame_bits; 593 } 594 595 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 596 { 597 return size * runtime->sample_bits / 8; 598 } 599 600 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 601 { 602 return size * runtime->frame_bits / 8; 603 } 604 605 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 606 { 607 return bytes % runtime->byte_align == 0; 608 } 609 610 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 611 { 612 struct snd_pcm_runtime *runtime = substream->runtime; 613 return frames_to_bytes(runtime, runtime->buffer_size); 614 } 615 616 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 617 { 618 struct snd_pcm_runtime *runtime = substream->runtime; 619 return frames_to_bytes(runtime, runtime->period_size); 620 } 621 622 /* 623 * result is: 0 ... (boundary - 1) 624 */ 625 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 626 { 627 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 628 if (avail < 0) 629 avail += runtime->boundary; 630 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 631 avail -= runtime->boundary; 632 return avail; 633 } 634 635 /* 636 * result is: 0 ... (boundary - 1) 637 */ 638 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 639 { 640 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 641 if (avail < 0) 642 avail += runtime->boundary; 643 return avail; 644 } 645 646 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 647 { 648 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 649 } 650 651 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 652 { 653 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 654 } 655 656 /** 657 * snd_pcm_playback_ready - check whether the playback buffer is available 658 * @substream: the pcm substream instance 659 * 660 * Checks whether enough free space is available on the playback buffer. 661 * 662 * Returns non-zero if available, or zero if not. 663 */ 664 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 665 { 666 struct snd_pcm_runtime *runtime = substream->runtime; 667 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 668 } 669 670 /** 671 * snd_pcm_capture_ready - check whether the capture buffer is available 672 * @substream: the pcm substream instance 673 * 674 * Checks whether enough capture data is available on the capture buffer. 675 * 676 * Returns non-zero if available, or zero if not. 677 */ 678 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 679 { 680 struct snd_pcm_runtime *runtime = substream->runtime; 681 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 682 } 683 684 /** 685 * snd_pcm_playback_data - check whether any data exists on the playback buffer 686 * @substream: the pcm substream instance 687 * 688 * Checks whether any data exists on the playback buffer. If stop_threshold 689 * is bigger or equal to boundary, then this function returns always non-zero. 690 * 691 * Returns non-zero if exists, or zero if not. 692 */ 693 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 694 { 695 struct snd_pcm_runtime *runtime = substream->runtime; 696 697 if (runtime->stop_threshold >= runtime->boundary) 698 return 1; 699 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 700 } 701 702 /** 703 * snd_pcm_playback_empty - check whether the playback buffer is empty 704 * @substream: the pcm substream instance 705 * 706 * Checks whether the playback buffer is empty. 707 * 708 * Returns non-zero if empty, or zero if not. 709 */ 710 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 711 { 712 struct snd_pcm_runtime *runtime = substream->runtime; 713 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 714 } 715 716 /** 717 * snd_pcm_capture_empty - check whether the capture buffer is empty 718 * @substream: the pcm substream instance 719 * 720 * Checks whether the capture buffer is empty. 721 * 722 * Returns non-zero if empty, or zero if not. 723 */ 724 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 725 { 726 struct snd_pcm_runtime *runtime = substream->runtime; 727 return snd_pcm_capture_avail(runtime) == 0; 728 } 729 730 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 731 struct snd_pcm_substream *master) 732 { 733 substream->runtime->trigger_master = master; 734 } 735 736 static inline int hw_is_mask(int var) 737 { 738 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 739 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 740 } 741 742 static inline int hw_is_interval(int var) 743 { 744 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 745 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 746 } 747 748 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 749 snd_pcm_hw_param_t var) 750 { 751 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 752 } 753 754 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 755 snd_pcm_hw_param_t var) 756 { 757 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 758 } 759 760 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 761 snd_pcm_hw_param_t var) 762 { 763 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 764 } 765 766 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 767 snd_pcm_hw_param_t var) 768 { 769 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 770 } 771 772 #define params_channels(p) \ 773 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min) 774 #define params_rate(p) \ 775 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min) 776 #define params_period_size(p) \ 777 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min) 778 #define params_periods(p) \ 779 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min) 780 #define params_buffer_size(p) \ 781 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min) 782 #define params_buffer_bytes(p) \ 783 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min) 784 785 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 786 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 787 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 788 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 789 unsigned int k, struct snd_interval *c); 790 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 791 const struct snd_interval *b, struct snd_interval *c); 792 int snd_interval_list(struct snd_interval *i, unsigned int count, 793 const unsigned int *list, unsigned int mask); 794 int snd_interval_ratnum(struct snd_interval *i, 795 unsigned int rats_count, struct snd_ratnum *rats, 796 unsigned int *nump, unsigned int *denp); 797 798 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 799 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 800 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 801 802 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 803 804 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 805 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 806 807 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 808 u_int32_t mask); 809 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 810 u_int64_t mask); 811 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 812 unsigned int min, unsigned int max); 813 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 814 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 815 unsigned int cond, 816 snd_pcm_hw_param_t var, 817 const struct snd_pcm_hw_constraint_list *l); 818 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 819 unsigned int cond, 820 snd_pcm_hw_param_t var, 821 struct snd_pcm_hw_constraint_ratnums *r); 822 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 823 unsigned int cond, 824 snd_pcm_hw_param_t var, 825 struct snd_pcm_hw_constraint_ratdens *r); 826 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 827 unsigned int cond, 828 unsigned int width, 829 unsigned int msbits); 830 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 831 unsigned int cond, 832 snd_pcm_hw_param_t var, 833 unsigned long step); 834 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 835 unsigned int cond, 836 snd_pcm_hw_param_t var); 837 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 838 unsigned int base_rate); 839 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 840 unsigned int cond, 841 int var, 842 snd_pcm_hw_rule_func_t func, void *private, 843 int dep, ...); 844 845 int snd_pcm_format_signed(snd_pcm_format_t format); 846 int snd_pcm_format_unsigned(snd_pcm_format_t format); 847 int snd_pcm_format_linear(snd_pcm_format_t format); 848 int snd_pcm_format_little_endian(snd_pcm_format_t format); 849 int snd_pcm_format_big_endian(snd_pcm_format_t format); 850 #if 0 /* just for DocBook */ 851 /** 852 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 853 * @format: the format to check 854 * 855 * Returns 1 if the given PCM format is CPU-endian, 0 if 856 * opposite, or a negative error code if endian not specified. 857 */ 858 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 859 #endif /* DocBook */ 860 #ifdef SNDRV_LITTLE_ENDIAN 861 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 862 #else 863 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 864 #endif 865 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 866 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 867 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 868 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 869 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 870 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 871 872 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 873 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 874 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 875 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 876 unsigned int cmd, void *arg); 877 int snd_pcm_update_state(struct snd_pcm_substream *substream, 878 struct snd_pcm_runtime *runtime); 879 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 880 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 881 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 882 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 883 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 884 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 885 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 886 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 887 const void __user *buf, 888 snd_pcm_uframes_t frames); 889 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 890 void __user *buf, snd_pcm_uframes_t frames); 891 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 892 void __user **bufs, snd_pcm_uframes_t frames); 893 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 894 void __user **bufs, snd_pcm_uframes_t frames); 895 896 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 897 898 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 899 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 900 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 901 902 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 903 struct snd_dma_buffer *bufp) 904 { 905 struct snd_pcm_runtime *runtime = substream->runtime; 906 if (bufp) { 907 runtime->dma_buffer_p = bufp; 908 runtime->dma_area = bufp->area; 909 runtime->dma_addr = bufp->addr; 910 runtime->dma_bytes = bufp->bytes; 911 } else { 912 runtime->dma_buffer_p = NULL; 913 runtime->dma_area = NULL; 914 runtime->dma_addr = 0; 915 runtime->dma_bytes = 0; 916 } 917 } 918 919 /* 920 * Timer interface 921 */ 922 923 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 924 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 925 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 926 927 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 928 struct timespec *tv) 929 { 930 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 931 do_posix_clock_monotonic_gettime(tv); 932 else 933 getnstimeofday(tv); 934 } 935 936 /* 937 * Memory 938 */ 939 940 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 941 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 942 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 943 int type, struct device *data, 944 size_t size, size_t max); 945 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 946 int type, void *data, 947 size_t size, size_t max); 948 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 949 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 950 951 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 952 size_t size, gfp_t gfp_flags); 953 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 954 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 955 unsigned long offset); 956 #if 0 /* for kernel-doc */ 957 /** 958 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 959 * @substream: the substream to allocate the buffer to 960 * @size: the requested buffer size, in bytes 961 * 962 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 963 * contiguous in kernel virtual space, but not in physical memory. Use this 964 * if the buffer is accessed by kernel code but not by device DMA. 965 * 966 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error 967 * code. 968 */ 969 static int snd_pcm_lib_alloc_vmalloc_buffer 970 (struct snd_pcm_substream *substream, size_t size); 971 /** 972 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 973 * @substream: the substream to allocate the buffer to 974 * @size: the requested buffer size, in bytes 975 * 976 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 977 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 978 */ 979 static int snd_pcm_lib_alloc_vmalloc_32_buffer 980 (struct snd_pcm_substream *substream, size_t size); 981 #endif 982 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \ 983 _snd_pcm_lib_alloc_vmalloc_buffer \ 984 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO) 985 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \ 986 _snd_pcm_lib_alloc_vmalloc_buffer \ 987 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO) 988 989 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 990 991 #ifdef CONFIG_SND_DMA_SGBUF 992 /* 993 * SG-buffer handling 994 */ 995 #define snd_pcm_substream_sgbuf(substream) \ 996 snd_pcm_get_dma_buf(substream)->private_data 997 998 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 999 unsigned long offset); 1000 #else /* !SND_DMA_SGBUF */ 1001 /* 1002 * fake using a continuous buffer 1003 */ 1004 #define snd_pcm_sgbuf_ops_page NULL 1005 #endif /* SND_DMA_SGBUF */ 1006 1007 static inline dma_addr_t 1008 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1009 { 1010 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1011 } 1012 1013 static inline void * 1014 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 1015 { 1016 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs); 1017 } 1018 1019 static inline unsigned int 1020 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1021 unsigned int ofs, unsigned int size) 1022 { 1023 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1024 } 1025 1026 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1027 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1028 { 1029 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1030 atomic_inc(&substream->mmap_count); 1031 } 1032 1033 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1034 { 1035 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1036 atomic_dec(&substream->mmap_count); 1037 } 1038 1039 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1040 struct vm_area_struct *area); 1041 /* mmap for io-memory area */ 1042 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1043 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1044 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1045 #else 1046 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1047 #define snd_pcm_lib_mmap_iomem NULL 1048 #endif 1049 1050 #define snd_pcm_lib_mmap_vmalloc NULL 1051 1052 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1053 { 1054 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1055 } 1056 1057 /* 1058 * Misc 1059 */ 1060 1061 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1062 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1063 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1064 (IEC958_AES3_CON_FS_48000<<24)) 1065 1066 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1067 1068 const char *snd_pcm_format_name(snd_pcm_format_t format); 1069 1070 /** 1071 * snd_pcm_stream_str - Get a string naming the direction of a stream 1072 * @substream: the pcm substream instance 1073 */ 1074 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1075 { 1076 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1077 return "Playback"; 1078 else 1079 return "Capture"; 1080 } 1081 1082 /* 1083 * PCM channel-mapping control API 1084 */ 1085 /* array element of channel maps */ 1086 struct snd_pcm_chmap_elem { 1087 unsigned char channels; 1088 unsigned char map[15]; 1089 }; 1090 1091 /* channel map information; retrieved via snd_kcontrol_chip() */ 1092 struct snd_pcm_chmap { 1093 struct snd_pcm *pcm; /* assigned PCM instance */ 1094 int stream; /* PLAYBACK or CAPTURE */ 1095 struct snd_kcontrol *kctl; 1096 const struct snd_pcm_chmap_elem *chmap; 1097 unsigned int max_channels; 1098 unsigned int channel_mask; /* optional: active channels bitmask */ 1099 void *private_data; /* optional: private data pointer */ 1100 }; 1101 1102 /* get the PCM substream assigned to the given chmap info */ 1103 static inline struct snd_pcm_substream * 1104 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1105 { 1106 struct snd_pcm_substream *s; 1107 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1108 if (s->number == idx) 1109 return s; 1110 return NULL; 1111 } 1112 1113 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1114 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1115 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1116 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1117 1118 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1119 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1120 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1121 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1122 1123 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1124 const struct snd_pcm_chmap_elem *chmap, 1125 int max_channels, 1126 unsigned long private_value, 1127 struct snd_pcm_chmap **info_ret); 1128 1129 #endif /* __SOUND_PCM_H */ 1130