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 <linux/poll.h> 29 #include <linux/mm.h> 30 #include <linux/bitops.h> 31 32 #define snd_pcm_substream_chip(substream) ((substream)->private_data) 33 #define snd_pcm_chip(pcm) ((pcm)->private_data) 34 35 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 36 #include "pcm_oss.h" 37 #endif 38 39 /* 40 * Hardware (lowlevel) section 41 */ 42 43 struct snd_pcm_hardware { 44 unsigned int info; /* SNDRV_PCM_INFO_* */ 45 u64 formats; /* SNDRV_PCM_FMTBIT_* */ 46 unsigned int rates; /* SNDRV_PCM_RATE_* */ 47 unsigned int rate_min; /* min rate */ 48 unsigned int rate_max; /* max rate */ 49 unsigned int channels_min; /* min channels */ 50 unsigned int channels_max; /* max channels */ 51 size_t buffer_bytes_max; /* max buffer size */ 52 size_t period_bytes_min; /* min period size */ 53 size_t period_bytes_max; /* max period size */ 54 unsigned int periods_min; /* min # of periods */ 55 unsigned int periods_max; /* max # of periods */ 56 size_t fifo_size; /* fifo size in bytes */ 57 }; 58 59 struct snd_pcm_substream; 60 61 struct snd_pcm_ops { 62 int (*open)(struct snd_pcm_substream *substream); 63 int (*close)(struct snd_pcm_substream *substream); 64 int (*ioctl)(struct snd_pcm_substream * substream, 65 unsigned int cmd, void *arg); 66 int (*hw_params)(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params *params); 68 int (*hw_free)(struct snd_pcm_substream *substream); 69 int (*prepare)(struct snd_pcm_substream *substream); 70 int (*trigger)(struct snd_pcm_substream *substream, int cmd); 71 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); 72 int (*copy)(struct snd_pcm_substream *substream, int channel, 73 snd_pcm_uframes_t pos, 74 void __user *buf, snd_pcm_uframes_t count); 75 int (*silence)(struct snd_pcm_substream *substream, int channel, 76 snd_pcm_uframes_t pos, snd_pcm_uframes_t count); 77 struct page *(*page)(struct snd_pcm_substream *substream, 78 unsigned long offset); 79 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); 80 int (*ack)(struct snd_pcm_substream *substream); 81 }; 82 83 /* 84 * 85 */ 86 87 #define SNDRV_PCM_DEVICES 8 88 89 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0) 90 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1) 91 92 #define SNDRV_PCM_IOCTL1_RESET 0 93 #define SNDRV_PCM_IOCTL1_INFO 1 94 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 95 #define SNDRV_PCM_IOCTL1_GSTATE 3 96 97 #define SNDRV_PCM_TRIGGER_STOP 0 98 #define SNDRV_PCM_TRIGGER_START 1 99 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 100 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 101 #define SNDRV_PCM_TRIGGER_SUSPEND 5 102 #define SNDRV_PCM_TRIGGER_RESUME 6 103 104 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) 105 106 /* If you change this don't forget to change rates[] table in pcm_native.c */ 107 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */ 108 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */ 109 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */ 110 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */ 111 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */ 112 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */ 113 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */ 114 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */ 115 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */ 116 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */ 117 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */ 118 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */ 119 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */ 120 121 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */ 122 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */ 123 124 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ 125 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ 126 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) 127 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) 128 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ 129 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) 130 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ 131 SNDRV_PCM_RATE_192000) 132 #define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8) 133 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8) 134 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE) 135 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE) 136 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE) 137 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE) 138 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE) 139 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE) 140 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE) 141 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE) 142 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE) 143 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE) 144 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE) 145 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE) 146 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE) 147 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE) 148 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE) 149 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE) 150 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE) 151 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE) 152 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW) 153 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW) 154 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM) 155 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG) 156 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM) 157 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL) 158 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE) 159 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE) 160 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE) 161 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE) 162 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE) 163 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE) 164 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE) 165 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE) 166 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE) 167 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE) 168 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE) 169 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE) 170 171 #ifdef SNDRV_LITTLE_ENDIAN 172 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 173 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 174 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 175 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 176 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 177 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 178 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 179 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 180 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 181 #endif 182 #ifdef SNDRV_BIG_ENDIAN 183 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 184 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 185 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 186 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 187 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 188 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 189 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 190 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 191 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 192 #endif 193 194 struct snd_pcm_file { 195 struct snd_pcm_substream *substream; 196 int no_compat_mmap; 197 }; 198 199 struct snd_pcm_hw_rule; 200 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 201 struct snd_pcm_hw_rule *rule); 202 203 struct snd_pcm_hw_rule { 204 unsigned int cond; 205 snd_pcm_hw_rule_func_t func; 206 int var; 207 int deps[4]; 208 void *private; 209 }; 210 211 struct snd_pcm_hw_constraints { 212 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 213 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 214 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 215 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 216 unsigned int rules_num; 217 unsigned int rules_all; 218 struct snd_pcm_hw_rule *rules; 219 }; 220 221 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 222 snd_pcm_hw_param_t var) 223 { 224 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 225 } 226 227 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 228 snd_pcm_hw_param_t var) 229 { 230 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 231 } 232 233 struct snd_ratnum { 234 unsigned int num; 235 unsigned int den_min, den_max, den_step; 236 }; 237 238 struct snd_ratden { 239 unsigned int num_min, num_max, num_step; 240 unsigned int den; 241 }; 242 243 struct snd_pcm_hw_constraint_ratnums { 244 int nrats; 245 struct snd_ratnum *rats; 246 }; 247 248 struct snd_pcm_hw_constraint_ratdens { 249 int nrats; 250 struct snd_ratden *rats; 251 }; 252 253 struct snd_pcm_hw_constraint_list { 254 unsigned int count; 255 unsigned int *list; 256 unsigned int mask; 257 }; 258 259 struct snd_pcm_runtime { 260 /* -- Status -- */ 261 struct snd_pcm_substream *trigger_master; 262 struct timespec trigger_tstamp; /* trigger timestamp */ 263 int overrange; 264 snd_pcm_uframes_t avail_max; 265 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 266 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/ 267 268 /* -- HW params -- */ 269 snd_pcm_access_t access; /* access mode */ 270 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 271 snd_pcm_subformat_t subformat; /* subformat */ 272 unsigned int rate; /* rate in Hz */ 273 unsigned int channels; /* channels */ 274 snd_pcm_uframes_t period_size; /* period size */ 275 unsigned int periods; /* periods */ 276 snd_pcm_uframes_t buffer_size; /* buffer size */ 277 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 278 size_t byte_align; 279 unsigned int frame_bits; 280 unsigned int sample_bits; 281 unsigned int info; 282 unsigned int rate_num; 283 unsigned int rate_den; 284 285 /* -- SW params -- */ 286 int tstamp_mode; /* mmap timestamp is updated */ 287 unsigned int period_step; 288 snd_pcm_uframes_t start_threshold; 289 snd_pcm_uframes_t stop_threshold; 290 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 291 noise is nearest than this */ 292 snd_pcm_uframes_t silence_size; /* Silence filling size */ 293 snd_pcm_uframes_t boundary; /* pointers wrap point */ 294 295 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 296 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 297 298 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 299 300 /* -- mmap -- */ 301 struct snd_pcm_mmap_status *status; 302 struct snd_pcm_mmap_control *control; 303 304 /* -- locking / scheduling -- */ 305 wait_queue_head_t sleep; 306 struct fasync_struct *fasync; 307 308 /* -- private section -- */ 309 void *private_data; 310 void (*private_free)(struct snd_pcm_runtime *runtime); 311 312 /* -- hardware description -- */ 313 struct snd_pcm_hardware hw; 314 struct snd_pcm_hw_constraints hw_constraints; 315 316 /* -- interrupt callbacks -- */ 317 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 318 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 319 320 /* -- timer -- */ 321 unsigned int timer_resolution; /* timer resolution */ 322 int tstamp_type; /* timestamp type */ 323 324 /* -- DMA -- */ 325 unsigned char *dma_area; /* DMA area */ 326 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 327 size_t dma_bytes; /* size of DMA area */ 328 329 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 330 331 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 332 /* -- OSS things -- */ 333 struct snd_pcm_oss_runtime oss; 334 #endif 335 }; 336 337 struct snd_pcm_group { /* keep linked substreams */ 338 spinlock_t lock; 339 struct list_head substreams; 340 int count; 341 }; 342 343 struct snd_pcm_substream { 344 struct snd_pcm *pcm; 345 struct snd_pcm_str *pstr; 346 void *private_data; /* copied from pcm->private_data */ 347 int number; 348 char name[32]; /* substream name */ 349 int stream; /* stream (direction) */ 350 char latency_id[20]; /* latency identifier */ 351 size_t buffer_bytes_max; /* limit ring buffer size */ 352 struct snd_dma_buffer dma_buffer; 353 unsigned int dma_buf_id; 354 size_t dma_max; 355 /* -- hardware operations -- */ 356 struct snd_pcm_ops *ops; 357 /* -- runtime information -- */ 358 struct snd_pcm_runtime *runtime; 359 /* -- timer section -- */ 360 struct snd_timer *timer; /* timer */ 361 unsigned timer_running: 1; /* time is running */ 362 spinlock_t timer_lock; 363 /* -- next substream -- */ 364 struct snd_pcm_substream *next; 365 /* -- linked substreams -- */ 366 struct list_head link_list; /* linked list member */ 367 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 368 struct snd_pcm_group *group; /* pointer to current group */ 369 /* -- assigned files -- */ 370 void *file; 371 int ref_count; 372 atomic_t mmap_count; 373 unsigned int f_flags; 374 void (*pcm_release)(struct snd_pcm_substream *); 375 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 376 /* -- OSS things -- */ 377 struct snd_pcm_oss_substream oss; 378 #endif 379 #ifdef CONFIG_SND_VERBOSE_PROCFS 380 struct snd_info_entry *proc_root; 381 struct snd_info_entry *proc_info_entry; 382 struct snd_info_entry *proc_hw_params_entry; 383 struct snd_info_entry *proc_sw_params_entry; 384 struct snd_info_entry *proc_status_entry; 385 struct snd_info_entry *proc_prealloc_entry; 386 struct snd_info_entry *proc_prealloc_max_entry; 387 #endif 388 /* misc flags */ 389 unsigned int hw_opened: 1; 390 }; 391 392 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 393 394 395 struct snd_pcm_str { 396 int stream; /* stream (direction) */ 397 struct snd_pcm *pcm; 398 /* -- substreams -- */ 399 unsigned int substream_count; 400 unsigned int substream_opened; 401 struct snd_pcm_substream *substream; 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 403 /* -- OSS things -- */ 404 struct snd_pcm_oss_stream oss; 405 #endif 406 #ifdef CONFIG_SND_VERBOSE_PROCFS 407 struct snd_info_entry *proc_root; 408 struct snd_info_entry *proc_info_entry; 409 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 410 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 411 struct snd_info_entry *proc_xrun_debug_entry; 412 #endif 413 #endif 414 }; 415 416 struct snd_pcm { 417 struct snd_card *card; 418 struct list_head list; 419 unsigned int device; /* device number */ 420 unsigned int info_flags; 421 unsigned short dev_class; 422 unsigned short dev_subclass; 423 char id[64]; 424 char name[80]; 425 struct snd_pcm_str streams[2]; 426 struct mutex open_mutex; 427 wait_queue_head_t open_wait; 428 void *private_data; 429 void (*private_free) (struct snd_pcm *pcm); 430 struct device *dev; /* actual hw device this belongs to */ 431 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 432 struct snd_pcm_oss oss; 433 #endif 434 }; 435 436 struct snd_pcm_notify { 437 int (*n_register) (struct snd_pcm * pcm); 438 int (*n_disconnect) (struct snd_pcm * pcm); 439 int (*n_unregister) (struct snd_pcm * pcm); 440 struct list_head list; 441 }; 442 443 /* 444 * Registering 445 */ 446 447 extern const struct file_operations snd_pcm_f_ops[2]; 448 449 int snd_pcm_new(struct snd_card *card, char *id, int device, 450 int playback_count, int capture_count, 451 struct snd_pcm **rpcm); 452 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 453 454 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 455 456 /* 457 * Native I/O 458 */ 459 460 extern rwlock_t snd_pcm_link_rwlock; 461 462 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 463 int snd_pcm_info_user(struct snd_pcm_substream *substream, 464 struct snd_pcm_info __user *info); 465 int snd_pcm_status(struct snd_pcm_substream *substream, 466 struct snd_pcm_status *status); 467 int snd_pcm_start(struct snd_pcm_substream *substream); 468 int snd_pcm_stop(struct snd_pcm_substream *substream, int status); 469 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 470 #ifdef CONFIG_PM 471 int snd_pcm_suspend(struct snd_pcm_substream *substream); 472 int snd_pcm_suspend_all(struct snd_pcm *pcm); 473 #endif 474 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 475 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 476 struct snd_pcm_substream **rsubstream); 477 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 478 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 479 struct snd_pcm_substream **rsubstream); 480 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 481 void snd_pcm_vma_notify_data(void *client, void *data); 482 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 483 484 #if BITS_PER_LONG >= 64 485 486 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 487 { 488 *rem = *n % div; 489 *n /= div; 490 } 491 492 #elif defined(i386) 493 494 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 495 { 496 u_int32_t low, high; 497 low = *n & 0xffffffff; 498 high = *n >> 32; 499 if (high) { 500 u_int32_t high1 = high % div; 501 high /= div; 502 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1)); 503 *n = (u_int64_t)high << 32 | low; 504 } else { 505 *n = low / div; 506 *rem = low % div; 507 } 508 } 509 #else 510 511 static inline void divl(u_int32_t high, u_int32_t low, 512 u_int32_t div, 513 u_int32_t *q, u_int32_t *r) 514 { 515 u_int64_t n = (u_int64_t)high << 32 | low; 516 u_int64_t d = (u_int64_t)div << 31; 517 u_int32_t q1 = 0; 518 int c = 32; 519 while (n > 0xffffffffU) { 520 q1 <<= 1; 521 if (n >= d) { 522 n -= d; 523 q1 |= 1; 524 } 525 d >>= 1; 526 c--; 527 } 528 q1 <<= c; 529 if (n) { 530 low = n; 531 *q = q1 | (low / div); 532 *r = low % div; 533 } else { 534 *r = 0; 535 *q = q1; 536 } 537 return; 538 } 539 540 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 541 { 542 u_int32_t low, high; 543 low = *n & 0xffffffff; 544 high = *n >> 32; 545 if (high) { 546 u_int32_t high1 = high % div; 547 u_int32_t low1 = low; 548 high /= div; 549 divl(high1, low1, div, &low, rem); 550 *n = (u_int64_t)high << 32 | low; 551 } else { 552 *n = low / div; 553 *rem = low % div; 554 } 555 } 556 #endif 557 558 /* 559 * PCM library 560 */ 561 562 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 563 { 564 return substream->group != &substream->self_group; 565 } 566 567 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 568 { 569 read_lock(&snd_pcm_link_rwlock); 570 spin_lock(&substream->self_group.lock); 571 } 572 573 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 574 { 575 spin_unlock(&substream->self_group.lock); 576 read_unlock(&snd_pcm_link_rwlock); 577 } 578 579 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 580 { 581 read_lock_irq(&snd_pcm_link_rwlock); 582 spin_lock(&substream->self_group.lock); 583 } 584 585 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 586 { 587 spin_unlock(&substream->self_group.lock); 588 read_unlock_irq(&snd_pcm_link_rwlock); 589 } 590 591 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 592 do { \ 593 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 594 spin_lock(&substream->self_group.lock); \ 595 } while (0) 596 597 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 598 do { \ 599 spin_unlock(&substream->self_group.lock); \ 600 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 601 } while (0) 602 603 #define snd_pcm_group_for_each_entry(s, substream) \ 604 list_for_each_entry(s, &substream->group->substreams, link_list) 605 606 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 607 { 608 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 609 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 610 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 611 } 612 613 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 614 { 615 return size * 8 / runtime->sample_bits; 616 } 617 618 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 619 { 620 return size * 8 / runtime->frame_bits; 621 } 622 623 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 624 { 625 return size * runtime->sample_bits / 8; 626 } 627 628 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 629 { 630 return size * runtime->frame_bits / 8; 631 } 632 633 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 634 { 635 return bytes % runtime->byte_align == 0; 636 } 637 638 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 639 { 640 struct snd_pcm_runtime *runtime = substream->runtime; 641 return frames_to_bytes(runtime, runtime->buffer_size); 642 } 643 644 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 645 { 646 struct snd_pcm_runtime *runtime = substream->runtime; 647 return frames_to_bytes(runtime, runtime->period_size); 648 } 649 650 /* 651 * result is: 0 ... (boundary - 1) 652 */ 653 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 654 { 655 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 656 if (avail < 0) 657 avail += runtime->boundary; 658 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 659 avail -= runtime->boundary; 660 return avail; 661 } 662 663 /* 664 * result is: 0 ... (boundary - 1) 665 */ 666 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 667 { 668 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 669 if (avail < 0) 670 avail += runtime->boundary; 671 return avail; 672 } 673 674 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 675 { 676 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 677 } 678 679 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 680 { 681 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 682 } 683 684 /** 685 * snd_pcm_playback_ready - check whether the playback buffer is available 686 * @substream: the pcm substream instance 687 * 688 * Checks whether enough free space is available on the playback buffer. 689 * 690 * Returns non-zero if available, or zero if not. 691 */ 692 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 693 { 694 struct snd_pcm_runtime *runtime = substream->runtime; 695 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 696 } 697 698 /** 699 * snd_pcm_capture_ready - check whether the capture buffer is available 700 * @substream: the pcm substream instance 701 * 702 * Checks whether enough capture data is available on the capture buffer. 703 * 704 * Returns non-zero if available, or zero if not. 705 */ 706 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 707 { 708 struct snd_pcm_runtime *runtime = substream->runtime; 709 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 710 } 711 712 /** 713 * snd_pcm_playback_data - check whether any data exists on the playback buffer 714 * @substream: the pcm substream instance 715 * 716 * Checks whether any data exists on the playback buffer. If stop_threshold 717 * is bigger or equal to boundary, then this function returns always non-zero. 718 * 719 * Returns non-zero if exists, or zero if not. 720 */ 721 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 722 { 723 struct snd_pcm_runtime *runtime = substream->runtime; 724 725 if (runtime->stop_threshold >= runtime->boundary) 726 return 1; 727 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 728 } 729 730 /** 731 * snd_pcm_playback_empty - check whether the playback buffer is empty 732 * @substream: the pcm substream instance 733 * 734 * Checks whether the playback buffer is empty. 735 * 736 * Returns non-zero if empty, or zero if not. 737 */ 738 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 739 { 740 struct snd_pcm_runtime *runtime = substream->runtime; 741 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 742 } 743 744 /** 745 * snd_pcm_capture_empty - check whether the capture buffer is empty 746 * @substream: the pcm substream instance 747 * 748 * Checks whether the capture buffer is empty. 749 * 750 * Returns non-zero if empty, or zero if not. 751 */ 752 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 753 { 754 struct snd_pcm_runtime *runtime = substream->runtime; 755 return snd_pcm_capture_avail(runtime) == 0; 756 } 757 758 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 759 struct snd_pcm_substream *master) 760 { 761 substream->runtime->trigger_master = master; 762 } 763 764 static inline int hw_is_mask(int var) 765 { 766 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 767 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 768 } 769 770 static inline int hw_is_interval(int var) 771 { 772 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 773 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 774 } 775 776 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 777 snd_pcm_hw_param_t var) 778 { 779 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 780 } 781 782 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 783 snd_pcm_hw_param_t var) 784 { 785 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 786 } 787 788 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 789 snd_pcm_hw_param_t var) 790 { 791 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 792 } 793 794 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 795 snd_pcm_hw_param_t var) 796 { 797 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 798 } 799 800 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS)) 801 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT)) 802 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 803 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 804 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 805 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 806 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 807 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 808 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 809 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min 810 811 812 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 813 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 814 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 815 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 816 unsigned int k, struct snd_interval *c); 817 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 818 const struct snd_interval *b, struct snd_interval *c); 819 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask); 820 int snd_interval_ratnum(struct snd_interval *i, 821 unsigned int rats_count, struct snd_ratnum *rats, 822 unsigned int *nump, unsigned int *denp); 823 824 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 825 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 826 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 827 828 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 829 830 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 831 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 832 833 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 834 u_int32_t mask); 835 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 836 u_int64_t mask); 837 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 838 unsigned int min, unsigned int max); 839 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 840 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 841 unsigned int cond, 842 snd_pcm_hw_param_t var, 843 struct snd_pcm_hw_constraint_list *l); 844 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 845 unsigned int cond, 846 snd_pcm_hw_param_t var, 847 struct snd_pcm_hw_constraint_ratnums *r); 848 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 849 unsigned int cond, 850 snd_pcm_hw_param_t var, 851 struct snd_pcm_hw_constraint_ratdens *r); 852 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 853 unsigned int cond, 854 unsigned int width, 855 unsigned int msbits); 856 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 857 unsigned int cond, 858 snd_pcm_hw_param_t var, 859 unsigned long step); 860 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 861 unsigned int cond, 862 snd_pcm_hw_param_t var); 863 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 864 unsigned int cond, 865 int var, 866 snd_pcm_hw_rule_func_t func, void *private, 867 int dep, ...); 868 869 int snd_pcm_format_signed(snd_pcm_format_t format); 870 int snd_pcm_format_unsigned(snd_pcm_format_t format); 871 int snd_pcm_format_linear(snd_pcm_format_t format); 872 int snd_pcm_format_little_endian(snd_pcm_format_t format); 873 int snd_pcm_format_big_endian(snd_pcm_format_t format); 874 #if 0 /* just for DocBook */ 875 /** 876 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 877 * @format: the format to check 878 * 879 * Returns 1 if the given PCM format is CPU-endian, 0 if 880 * opposite, or a negative error code if endian not specified. 881 */ 882 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 883 #endif /* DocBook */ 884 #ifdef SNDRV_LITTLE_ENDIAN 885 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 886 #else 887 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 888 #endif 889 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 890 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 891 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 892 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 893 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 894 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 895 896 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 897 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 898 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 899 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 900 unsigned int cmd, void *arg); 901 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 902 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 903 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 904 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 905 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 906 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 907 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 908 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 909 const void __user *buf, 910 snd_pcm_uframes_t frames); 911 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 912 void __user *buf, snd_pcm_uframes_t frames); 913 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 914 void __user **bufs, snd_pcm_uframes_t frames); 915 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 916 void __user **bufs, snd_pcm_uframes_t frames); 917 918 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 919 920 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 921 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 922 923 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 924 struct snd_dma_buffer *bufp) 925 { 926 struct snd_pcm_runtime *runtime = substream->runtime; 927 if (bufp) { 928 runtime->dma_buffer_p = bufp; 929 runtime->dma_area = bufp->area; 930 runtime->dma_addr = bufp->addr; 931 runtime->dma_bytes = bufp->bytes; 932 } else { 933 runtime->dma_buffer_p = NULL; 934 runtime->dma_area = NULL; 935 runtime->dma_addr = 0; 936 runtime->dma_bytes = 0; 937 } 938 } 939 940 /* 941 * Timer interface 942 */ 943 944 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 945 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 946 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 947 948 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 949 struct timespec *tv) 950 { 951 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 952 do_posix_clock_monotonic_gettime(tv); 953 else 954 getnstimeofday(tv); 955 } 956 957 /* 958 * Memory 959 */ 960 961 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 962 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 963 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 964 int type, struct device *data, 965 size_t size, size_t max); 966 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 967 int type, void *data, 968 size_t size, size_t max); 969 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 970 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 971 972 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data) 973 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size) 974 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs) 975 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset); 976 977 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 978 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 979 { 980 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 981 atomic_inc(&substream->mmap_count); 982 } 983 984 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 985 { 986 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 987 atomic_dec(&substream->mmap_count); 988 } 989 990 /* mmap for io-memory area */ 991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 992 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 993 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 994 #else 995 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 996 #define snd_pcm_lib_mmap_iomem NULL 997 #endif 998 999 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1000 { 1001 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1002 } 1003 1004 /* 1005 * Misc 1006 */ 1007 1008 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1009 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1010 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1011 (IEC958_AES3_CON_FS_48000<<24)) 1012 1013 #endif /* __SOUND_PCM_H */ 1014