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 "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 }; 441 442 struct snd_pcm { 443 struct snd_card *card; 444 struct list_head list; 445 int device; /* device number */ 446 unsigned int info_flags; 447 unsigned short dev_class; 448 unsigned short dev_subclass; 449 char id[64]; 450 char name[80]; 451 struct snd_pcm_str streams[2]; 452 struct mutex open_mutex; 453 wait_queue_head_t open_wait; 454 void *private_data; 455 void (*private_free) (struct snd_pcm *pcm); 456 struct device *dev; /* actual hw device this belongs to */ 457 bool internal; /* pcm is for internal use only */ 458 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 459 struct snd_pcm_oss oss; 460 #endif 461 }; 462 463 struct snd_pcm_notify { 464 int (*n_register) (struct snd_pcm * pcm); 465 int (*n_disconnect) (struct snd_pcm * pcm); 466 int (*n_unregister) (struct snd_pcm * pcm); 467 struct list_head list; 468 }; 469 470 /* 471 * Registering 472 */ 473 474 extern const struct file_operations snd_pcm_f_ops[2]; 475 476 int snd_pcm_new(struct snd_card *card, const char *id, int device, 477 int playback_count, int capture_count, 478 struct snd_pcm **rpcm); 479 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 480 int playback_count, int capture_count, 481 struct snd_pcm **rpcm); 482 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 483 484 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 485 486 /* 487 * Native I/O 488 */ 489 490 extern rwlock_t snd_pcm_link_rwlock; 491 492 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 493 int snd_pcm_info_user(struct snd_pcm_substream *substream, 494 struct snd_pcm_info __user *info); 495 int snd_pcm_status(struct snd_pcm_substream *substream, 496 struct snd_pcm_status *status); 497 int snd_pcm_start(struct snd_pcm_substream *substream); 498 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 499 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 500 #ifdef CONFIG_PM 501 int snd_pcm_suspend(struct snd_pcm_substream *substream); 502 int snd_pcm_suspend_all(struct snd_pcm *pcm); 503 #endif 504 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 505 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 506 struct snd_pcm_substream **rsubstream); 507 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 508 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 509 struct snd_pcm_substream **rsubstream); 510 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 511 void snd_pcm_vma_notify_data(void *client, void *data); 512 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 513 514 515 #ifdef CONFIG_SND_DEBUG 516 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 517 char *name, size_t len); 518 #else 519 static inline void 520 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 521 { 522 *buf = 0; 523 } 524 #endif 525 526 /* 527 * PCM library 528 */ 529 530 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 531 { 532 return substream->group != &substream->self_group; 533 } 534 535 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 536 { 537 read_lock(&snd_pcm_link_rwlock); 538 spin_lock(&substream->self_group.lock); 539 } 540 541 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 542 { 543 spin_unlock(&substream->self_group.lock); 544 read_unlock(&snd_pcm_link_rwlock); 545 } 546 547 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 548 { 549 read_lock_irq(&snd_pcm_link_rwlock); 550 spin_lock(&substream->self_group.lock); 551 } 552 553 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 554 { 555 spin_unlock(&substream->self_group.lock); 556 read_unlock_irq(&snd_pcm_link_rwlock); 557 } 558 559 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 560 do { \ 561 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 562 spin_lock(&substream->self_group.lock); \ 563 } while (0) 564 565 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 566 do { \ 567 spin_unlock(&substream->self_group.lock); \ 568 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 569 } while (0) 570 571 #define snd_pcm_group_for_each_entry(s, substream) \ 572 list_for_each_entry(s, &substream->group->substreams, link_list) 573 574 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 575 { 576 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 577 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 578 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 579 } 580 581 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 582 { 583 return size * 8 / runtime->sample_bits; 584 } 585 586 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 587 { 588 return size * 8 / runtime->frame_bits; 589 } 590 591 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 592 { 593 return size * runtime->sample_bits / 8; 594 } 595 596 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 597 { 598 return size * runtime->frame_bits / 8; 599 } 600 601 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 602 { 603 return bytes % runtime->byte_align == 0; 604 } 605 606 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 607 { 608 struct snd_pcm_runtime *runtime = substream->runtime; 609 return frames_to_bytes(runtime, runtime->buffer_size); 610 } 611 612 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 613 { 614 struct snd_pcm_runtime *runtime = substream->runtime; 615 return frames_to_bytes(runtime, runtime->period_size); 616 } 617 618 /* 619 * result is: 0 ... (boundary - 1) 620 */ 621 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 622 { 623 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 624 if (avail < 0) 625 avail += runtime->boundary; 626 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 627 avail -= runtime->boundary; 628 return avail; 629 } 630 631 /* 632 * result is: 0 ... (boundary - 1) 633 */ 634 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 635 { 636 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 637 if (avail < 0) 638 avail += runtime->boundary; 639 return avail; 640 } 641 642 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 643 { 644 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 645 } 646 647 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 648 { 649 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 650 } 651 652 /** 653 * snd_pcm_playback_ready - check whether the playback buffer is available 654 * @substream: the pcm substream instance 655 * 656 * Checks whether enough free space is available on the playback buffer. 657 * 658 * Returns non-zero if available, or zero if not. 659 */ 660 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 661 { 662 struct snd_pcm_runtime *runtime = substream->runtime; 663 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 664 } 665 666 /** 667 * snd_pcm_capture_ready - check whether the capture buffer is available 668 * @substream: the pcm substream instance 669 * 670 * Checks whether enough capture data is available on the capture buffer. 671 * 672 * Returns non-zero if available, or zero if not. 673 */ 674 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 675 { 676 struct snd_pcm_runtime *runtime = substream->runtime; 677 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 678 } 679 680 /** 681 * snd_pcm_playback_data - check whether any data exists on the playback buffer 682 * @substream: the pcm substream instance 683 * 684 * Checks whether any data exists on the playback buffer. If stop_threshold 685 * is bigger or equal to boundary, then this function returns always non-zero. 686 * 687 * Returns non-zero if exists, or zero if not. 688 */ 689 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 690 { 691 struct snd_pcm_runtime *runtime = substream->runtime; 692 693 if (runtime->stop_threshold >= runtime->boundary) 694 return 1; 695 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 696 } 697 698 /** 699 * snd_pcm_playback_empty - check whether the playback buffer is empty 700 * @substream: the pcm substream instance 701 * 702 * Checks whether the playback buffer is empty. 703 * 704 * Returns non-zero if empty, or zero if not. 705 */ 706 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 707 { 708 struct snd_pcm_runtime *runtime = substream->runtime; 709 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 710 } 711 712 /** 713 * snd_pcm_capture_empty - check whether the capture buffer is empty 714 * @substream: the pcm substream instance 715 * 716 * Checks whether the capture buffer is empty. 717 * 718 * Returns non-zero if empty, or zero if not. 719 */ 720 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 721 { 722 struct snd_pcm_runtime *runtime = substream->runtime; 723 return snd_pcm_capture_avail(runtime) == 0; 724 } 725 726 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 727 struct snd_pcm_substream *master) 728 { 729 substream->runtime->trigger_master = master; 730 } 731 732 static inline int hw_is_mask(int var) 733 { 734 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 735 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 736 } 737 738 static inline int hw_is_interval(int var) 739 { 740 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 741 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 742 } 743 744 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 745 snd_pcm_hw_param_t var) 746 { 747 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 748 } 749 750 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 751 snd_pcm_hw_param_t var) 752 { 753 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 754 } 755 756 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 757 snd_pcm_hw_param_t var) 758 { 759 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 760 } 761 762 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 763 snd_pcm_hw_param_t var) 764 { 765 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 766 } 767 768 #define params_channels(p) \ 769 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min) 770 #define params_rate(p) \ 771 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min) 772 #define params_period_size(p) \ 773 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min) 774 #define params_periods(p) \ 775 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min) 776 #define params_buffer_size(p) \ 777 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min) 778 #define params_buffer_bytes(p) \ 779 (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min) 780 781 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 782 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 783 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 784 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 785 unsigned int k, struct snd_interval *c); 786 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 787 const struct snd_interval *b, struct snd_interval *c); 788 int snd_interval_list(struct snd_interval *i, unsigned int count, 789 const unsigned int *list, unsigned int mask); 790 int snd_interval_ratnum(struct snd_interval *i, 791 unsigned int rats_count, struct snd_ratnum *rats, 792 unsigned int *nump, unsigned int *denp); 793 794 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 795 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 796 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 797 798 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 799 800 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 801 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 802 803 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 804 u_int32_t mask); 805 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 806 u_int64_t mask); 807 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 808 unsigned int min, unsigned int max); 809 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 810 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 811 unsigned int cond, 812 snd_pcm_hw_param_t var, 813 struct snd_pcm_hw_constraint_list *l); 814 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 815 unsigned int cond, 816 snd_pcm_hw_param_t var, 817 struct snd_pcm_hw_constraint_ratnums *r); 818 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 819 unsigned int cond, 820 snd_pcm_hw_param_t var, 821 struct snd_pcm_hw_constraint_ratdens *r); 822 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 823 unsigned int cond, 824 unsigned int width, 825 unsigned int msbits); 826 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 827 unsigned int cond, 828 snd_pcm_hw_param_t var, 829 unsigned long step); 830 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 831 unsigned int cond, 832 snd_pcm_hw_param_t var); 833 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 834 unsigned int base_rate); 835 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 836 unsigned int cond, 837 int var, 838 snd_pcm_hw_rule_func_t func, void *private, 839 int dep, ...); 840 841 int snd_pcm_format_signed(snd_pcm_format_t format); 842 int snd_pcm_format_unsigned(snd_pcm_format_t format); 843 int snd_pcm_format_linear(snd_pcm_format_t format); 844 int snd_pcm_format_little_endian(snd_pcm_format_t format); 845 int snd_pcm_format_big_endian(snd_pcm_format_t format); 846 #if 0 /* just for DocBook */ 847 /** 848 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 849 * @format: the format to check 850 * 851 * Returns 1 if the given PCM format is CPU-endian, 0 if 852 * opposite, or a negative error code if endian not specified. 853 */ 854 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 855 #endif /* DocBook */ 856 #ifdef SNDRV_LITTLE_ENDIAN 857 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 858 #else 859 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 860 #endif 861 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 862 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 863 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 864 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 865 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 866 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 867 868 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 869 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 870 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 871 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 872 unsigned int cmd, void *arg); 873 int snd_pcm_update_state(struct snd_pcm_substream *substream, 874 struct snd_pcm_runtime *runtime); 875 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 876 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 877 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 878 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 879 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 880 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 881 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 882 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 883 const void __user *buf, 884 snd_pcm_uframes_t frames); 885 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 886 void __user *buf, snd_pcm_uframes_t frames); 887 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 888 void __user **bufs, snd_pcm_uframes_t frames); 889 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 890 void __user **bufs, snd_pcm_uframes_t frames); 891 892 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 893 894 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 895 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 896 897 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 898 struct snd_dma_buffer *bufp) 899 { 900 struct snd_pcm_runtime *runtime = substream->runtime; 901 if (bufp) { 902 runtime->dma_buffer_p = bufp; 903 runtime->dma_area = bufp->area; 904 runtime->dma_addr = bufp->addr; 905 runtime->dma_bytes = bufp->bytes; 906 } else { 907 runtime->dma_buffer_p = NULL; 908 runtime->dma_area = NULL; 909 runtime->dma_addr = 0; 910 runtime->dma_bytes = 0; 911 } 912 } 913 914 /* 915 * Timer interface 916 */ 917 918 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 919 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 920 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 921 922 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 923 struct timespec *tv) 924 { 925 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 926 do_posix_clock_monotonic_gettime(tv); 927 else 928 getnstimeofday(tv); 929 } 930 931 /* 932 * Memory 933 */ 934 935 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 936 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 937 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 938 int type, struct device *data, 939 size_t size, size_t max); 940 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 941 int type, void *data, 942 size_t size, size_t max); 943 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 944 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 945 946 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 947 size_t size, gfp_t gfp_flags); 948 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 949 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 950 unsigned long offset); 951 #if 0 /* for kernel-doc */ 952 /** 953 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 954 * @substream: the substream to allocate the buffer to 955 * @size: the requested buffer size, in bytes 956 * 957 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 958 * contiguous in kernel virtual space, but not in physical memory. Use this 959 * if the buffer is accessed by kernel code but not by device DMA. 960 * 961 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error 962 * code. 963 */ 964 static int snd_pcm_lib_alloc_vmalloc_buffer 965 (struct snd_pcm_substream *substream, size_t size); 966 /** 967 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 968 * @substream: the substream to allocate the buffer to 969 * @size: the requested buffer size, in bytes 970 * 971 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 972 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 973 */ 974 static int snd_pcm_lib_alloc_vmalloc_32_buffer 975 (struct snd_pcm_substream *substream, size_t size); 976 #endif 977 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \ 978 _snd_pcm_lib_alloc_vmalloc_buffer \ 979 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO) 980 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \ 981 _snd_pcm_lib_alloc_vmalloc_buffer \ 982 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO) 983 984 #ifdef CONFIG_SND_DMA_SGBUF 985 /* 986 * SG-buffer handling 987 */ 988 #define snd_pcm_substream_sgbuf(substream) \ 989 ((substream)->runtime->dma_buffer_p->private_data) 990 991 static inline dma_addr_t 992 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 993 { 994 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 995 return snd_sgbuf_get_addr(sg, ofs); 996 } 997 998 static inline void * 999 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 1000 { 1001 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 1002 return snd_sgbuf_get_ptr(sg, ofs); 1003 } 1004 1005 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 1006 unsigned long offset); 1007 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1008 unsigned int ofs, unsigned int size); 1009 1010 #else /* !SND_DMA_SGBUF */ 1011 /* 1012 * fake using a continuous buffer 1013 */ 1014 static inline dma_addr_t 1015 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1016 { 1017 return substream->runtime->dma_addr + ofs; 1018 } 1019 1020 static inline void * 1021 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 1022 { 1023 return substream->runtime->dma_area + ofs; 1024 } 1025 1026 #define snd_pcm_sgbuf_ops_page NULL 1027 1028 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size) 1029 1030 #endif /* SND_DMA_SGBUF */ 1031 1032 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1033 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1034 { 1035 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1036 atomic_inc(&substream->mmap_count); 1037 } 1038 1039 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1040 { 1041 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1042 atomic_dec(&substream->mmap_count); 1043 } 1044 1045 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1046 struct vm_area_struct *area); 1047 /* mmap for io-memory area */ 1048 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1049 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1050 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1051 #else 1052 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1053 #define snd_pcm_lib_mmap_iomem NULL 1054 #endif 1055 1056 #define snd_pcm_lib_mmap_vmalloc NULL 1057 1058 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1059 { 1060 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1061 } 1062 1063 /* 1064 * Misc 1065 */ 1066 1067 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1068 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1069 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1070 (IEC958_AES3_CON_FS_48000<<24)) 1071 1072 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1073 1074 const char *snd_pcm_format_name(snd_pcm_format_t format); 1075 1076 #endif /* __SOUND_PCM_H */ 1077