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