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/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 unsigned int tick_time; /* tick time */ 278 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 279 size_t byte_align; 280 unsigned int frame_bits; 281 unsigned int sample_bits; 282 unsigned int info; 283 unsigned int rate_num; 284 unsigned int rate_den; 285 286 /* -- SW params -- */ 287 int tstamp_mode; /* mmap timestamp is updated */ 288 unsigned int period_step; 289 unsigned int sleep_min; /* min ticks to sleep */ 290 snd_pcm_uframes_t xfer_align; /* xfer size need to be a multiple */ 291 snd_pcm_uframes_t start_threshold; 292 snd_pcm_uframes_t stop_threshold; 293 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 294 noise is nearest than this */ 295 snd_pcm_uframes_t silence_size; /* Silence filling size */ 296 snd_pcm_uframes_t boundary; /* pointers wrap point */ 297 298 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 299 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 300 301 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 302 303 /* -- mmap -- */ 304 volatile struct snd_pcm_mmap_status *status; 305 volatile struct snd_pcm_mmap_control *control; 306 307 /* -- locking / scheduling -- */ 308 wait_queue_head_t sleep; 309 struct timer_list tick_timer; 310 struct fasync_struct *fasync; 311 312 /* -- private section -- */ 313 void *private_data; 314 void (*private_free)(struct snd_pcm_runtime *runtime); 315 316 /* -- hardware description -- */ 317 struct snd_pcm_hardware hw; 318 struct snd_pcm_hw_constraints hw_constraints; 319 320 /* -- interrupt callbacks -- */ 321 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 322 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 323 324 /* -- timer -- */ 325 unsigned int timer_resolution; /* timer resolution */ 326 327 /* -- DMA -- */ 328 unsigned char *dma_area; /* DMA area */ 329 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 330 size_t dma_bytes; /* size of DMA area */ 331 332 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 333 334 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 335 /* -- OSS things -- */ 336 struct snd_pcm_oss_runtime oss; 337 #endif 338 }; 339 340 struct snd_pcm_group { /* keep linked substreams */ 341 spinlock_t lock; 342 struct list_head substreams; 343 int count; 344 }; 345 346 struct snd_pcm_substream { 347 struct snd_pcm *pcm; 348 struct snd_pcm_str *pstr; 349 void *private_data; /* copied from pcm->private_data */ 350 int number; 351 char name[32]; /* substream name */ 352 int stream; /* stream (direction) */ 353 char latency_id[20]; /* latency identifier */ 354 size_t buffer_bytes_max; /* limit ring buffer size */ 355 struct snd_dma_buffer dma_buffer; 356 unsigned int dma_buf_id; 357 size_t dma_max; 358 /* -- hardware operations -- */ 359 struct snd_pcm_ops *ops; 360 /* -- runtime information -- */ 361 struct snd_pcm_runtime *runtime; 362 /* -- timer section -- */ 363 struct snd_timer *timer; /* timer */ 364 unsigned timer_running: 1; /* time is running */ 365 spinlock_t timer_lock; 366 /* -- next substream -- */ 367 struct snd_pcm_substream *next; 368 /* -- linked substreams -- */ 369 struct list_head link_list; /* linked list member */ 370 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 371 struct snd_pcm_group *group; /* pointer to current group */ 372 /* -- assigned files -- */ 373 void *file; 374 int ref_count; 375 atomic_t mmap_count; 376 unsigned int f_flags; 377 void (*pcm_release)(struct snd_pcm_substream *); 378 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 379 /* -- OSS things -- */ 380 struct snd_pcm_oss_substream oss; 381 #endif 382 #ifdef CONFIG_SND_VERBOSE_PROCFS 383 struct snd_info_entry *proc_root; 384 struct snd_info_entry *proc_info_entry; 385 struct snd_info_entry *proc_hw_params_entry; 386 struct snd_info_entry *proc_sw_params_entry; 387 struct snd_info_entry *proc_status_entry; 388 struct snd_info_entry *proc_prealloc_entry; 389 struct snd_info_entry *proc_prealloc_max_entry; 390 #endif 391 /* misc flags */ 392 unsigned int hw_opened: 1; 393 }; 394 395 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 396 397 398 struct snd_pcm_str { 399 int stream; /* stream (direction) */ 400 struct snd_pcm *pcm; 401 /* -- substreams -- */ 402 unsigned int substream_count; 403 unsigned int substream_opened; 404 struct snd_pcm_substream *substream; 405 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 406 /* -- OSS things -- */ 407 struct snd_pcm_oss_stream oss; 408 #endif 409 #ifdef CONFIG_SND_VERBOSE_PROCFS 410 struct snd_info_entry *proc_root; 411 struct snd_info_entry *proc_info_entry; 412 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 413 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 414 struct snd_info_entry *proc_xrun_debug_entry; 415 #endif 416 #endif 417 }; 418 419 struct snd_pcm { 420 struct snd_card *card; 421 struct list_head list; 422 unsigned int device; /* device number */ 423 unsigned int info_flags; 424 unsigned short dev_class; 425 unsigned short dev_subclass; 426 char id[64]; 427 char name[80]; 428 struct snd_pcm_str streams[2]; 429 struct mutex open_mutex; 430 wait_queue_head_t open_wait; 431 void *private_data; 432 void (*private_free) (struct snd_pcm *pcm); 433 struct device *dev; /* actual hw device this belongs to */ 434 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 435 struct snd_pcm_oss oss; 436 #endif 437 }; 438 439 struct snd_pcm_notify { 440 int (*n_register) (struct snd_pcm * pcm); 441 int (*n_disconnect) (struct snd_pcm * pcm); 442 int (*n_unregister) (struct snd_pcm * pcm); 443 struct list_head list; 444 }; 445 446 /* 447 * Registering 448 */ 449 450 extern const struct file_operations snd_pcm_f_ops[2]; 451 452 int snd_pcm_new(struct snd_card *card, char *id, int device, 453 int playback_count, int capture_count, 454 struct snd_pcm **rpcm); 455 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 456 457 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 458 459 /* 460 * Native I/O 461 */ 462 463 extern rwlock_t snd_pcm_link_rwlock; 464 465 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 466 int snd_pcm_info_user(struct snd_pcm_substream *substream, 467 struct snd_pcm_info __user *info); 468 int snd_pcm_status(struct snd_pcm_substream *substream, 469 struct snd_pcm_status *status); 470 int snd_pcm_start(struct snd_pcm_substream *substream); 471 int snd_pcm_stop(struct snd_pcm_substream *substream, int status); 472 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 473 #ifdef CONFIG_PM 474 int snd_pcm_suspend(struct snd_pcm_substream *substream); 475 int snd_pcm_suspend_all(struct snd_pcm *pcm); 476 #endif 477 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 478 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 479 struct snd_pcm_substream **rsubstream); 480 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 481 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 482 struct snd_pcm_substream **rsubstream); 483 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 484 void snd_pcm_vma_notify_data(void *client, void *data); 485 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 486 487 #if BITS_PER_LONG >= 64 488 489 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 490 { 491 *rem = *n % div; 492 *n /= div; 493 } 494 495 #elif defined(i386) 496 497 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 498 { 499 u_int32_t low, high; 500 low = *n & 0xffffffff; 501 high = *n >> 32; 502 if (high) { 503 u_int32_t high1 = high % div; 504 high /= div; 505 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1)); 506 *n = (u_int64_t)high << 32 | low; 507 } else { 508 *n = low / div; 509 *rem = low % div; 510 } 511 } 512 #else 513 514 static inline void divl(u_int32_t high, u_int32_t low, 515 u_int32_t div, 516 u_int32_t *q, u_int32_t *r) 517 { 518 u_int64_t n = (u_int64_t)high << 32 | low; 519 u_int64_t d = (u_int64_t)div << 31; 520 u_int32_t q1 = 0; 521 int c = 32; 522 while (n > 0xffffffffU) { 523 q1 <<= 1; 524 if (n >= d) { 525 n -= d; 526 q1 |= 1; 527 } 528 d >>= 1; 529 c--; 530 } 531 q1 <<= c; 532 if (n) { 533 low = n; 534 *q = q1 | (low / div); 535 *r = low % div; 536 } else { 537 *r = 0; 538 *q = q1; 539 } 540 return; 541 } 542 543 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 544 { 545 u_int32_t low, high; 546 low = *n & 0xffffffff; 547 high = *n >> 32; 548 if (high) { 549 u_int32_t high1 = high % div; 550 u_int32_t low1 = low; 551 high /= div; 552 divl(high1, low1, div, &low, rem); 553 *n = (u_int64_t)high << 32 | low; 554 } else { 555 *n = low / div; 556 *rem = low % div; 557 } 558 } 559 #endif 560 561 /* 562 * PCM library 563 */ 564 565 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 566 { 567 return substream->group != &substream->self_group; 568 } 569 570 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 571 { 572 read_lock(&snd_pcm_link_rwlock); 573 spin_lock(&substream->self_group.lock); 574 } 575 576 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 577 { 578 spin_unlock(&substream->self_group.lock); 579 read_unlock(&snd_pcm_link_rwlock); 580 } 581 582 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 583 { 584 read_lock_irq(&snd_pcm_link_rwlock); 585 spin_lock(&substream->self_group.lock); 586 } 587 588 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 589 { 590 spin_unlock(&substream->self_group.lock); 591 read_unlock_irq(&snd_pcm_link_rwlock); 592 } 593 594 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 595 do { \ 596 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 597 spin_lock(&substream->self_group.lock); \ 598 } while (0) 599 600 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 601 do { \ 602 spin_unlock(&substream->self_group.lock); \ 603 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 604 } while (0) 605 606 #define snd_pcm_group_for_each_entry(s, substream) \ 607 list_for_each_entry(s, &substream->group->substreams, link_list) 608 609 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 610 { 611 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 612 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 613 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 614 } 615 616 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 617 { 618 return size * 8 / runtime->sample_bits; 619 } 620 621 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 622 { 623 return size * 8 / runtime->frame_bits; 624 } 625 626 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 627 { 628 return size * runtime->sample_bits / 8; 629 } 630 631 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 632 { 633 return size * runtime->frame_bits / 8; 634 } 635 636 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 637 { 638 return bytes % runtime->byte_align == 0; 639 } 640 641 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 642 { 643 struct snd_pcm_runtime *runtime = substream->runtime; 644 return frames_to_bytes(runtime, runtime->buffer_size); 645 } 646 647 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 648 { 649 struct snd_pcm_runtime *runtime = substream->runtime; 650 return frames_to_bytes(runtime, runtime->period_size); 651 } 652 653 /* 654 * result is: 0 ... (boundary - 1) 655 */ 656 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 657 { 658 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 659 if (avail < 0) 660 avail += runtime->boundary; 661 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 662 avail -= runtime->boundary; 663 return avail; 664 } 665 666 /* 667 * result is: 0 ... (boundary - 1) 668 */ 669 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 670 { 671 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 672 if (avail < 0) 673 avail += runtime->boundary; 674 return avail; 675 } 676 677 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 678 { 679 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 680 } 681 682 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 683 { 684 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 685 } 686 687 /** 688 * snd_pcm_playback_ready - check whether the playback buffer is available 689 * @substream: the pcm substream instance 690 * 691 * Checks whether enough free space is available on the playback buffer. 692 * 693 * Returns non-zero if available, or zero if not. 694 */ 695 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 696 { 697 struct snd_pcm_runtime *runtime = substream->runtime; 698 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 699 } 700 701 /** 702 * snd_pcm_capture_ready - check whether the capture buffer is available 703 * @substream: the pcm substream instance 704 * 705 * Checks whether enough capture data is available on the capture buffer. 706 * 707 * Returns non-zero if available, or zero if not. 708 */ 709 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 710 { 711 struct snd_pcm_runtime *runtime = substream->runtime; 712 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 713 } 714 715 /** 716 * snd_pcm_playback_data - check whether any data exists on the playback buffer 717 * @substream: the pcm substream instance 718 * 719 * Checks whether any data exists on the playback buffer. If stop_threshold 720 * is bigger or equal to boundary, then this function returns always non-zero. 721 * 722 * Returns non-zero if exists, or zero if not. 723 */ 724 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 725 { 726 struct snd_pcm_runtime *runtime = substream->runtime; 727 728 if (runtime->stop_threshold >= runtime->boundary) 729 return 1; 730 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 731 } 732 733 /** 734 * snd_pcm_playback_empty - check whether the playback buffer is empty 735 * @substream: the pcm substream instance 736 * 737 * Checks whether the playback buffer is empty. 738 * 739 * Returns non-zero if empty, or zero if not. 740 */ 741 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 742 { 743 struct snd_pcm_runtime *runtime = substream->runtime; 744 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 745 } 746 747 /** 748 * snd_pcm_capture_empty - check whether the capture buffer is empty 749 * @substream: the pcm substream instance 750 * 751 * Checks whether the capture buffer is empty. 752 * 753 * Returns non-zero if empty, or zero if not. 754 */ 755 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 756 { 757 struct snd_pcm_runtime *runtime = substream->runtime; 758 return snd_pcm_capture_avail(runtime) == 0; 759 } 760 761 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 762 struct snd_pcm_substream *master) 763 { 764 substream->runtime->trigger_master = master; 765 } 766 767 static inline int hw_is_mask(int var) 768 { 769 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 770 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 771 } 772 773 static inline int hw_is_interval(int var) 774 { 775 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 776 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 777 } 778 779 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 780 snd_pcm_hw_param_t var) 781 { 782 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 783 } 784 785 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 786 snd_pcm_hw_param_t var) 787 { 788 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 789 } 790 791 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 792 snd_pcm_hw_param_t var) 793 { 794 return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var); 795 } 796 797 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 798 snd_pcm_hw_param_t var) 799 { 800 return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var); 801 } 802 803 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS)) 804 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT)) 805 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 806 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 807 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 808 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 809 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 810 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 811 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 812 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min 813 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min 814 815 816 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 817 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 818 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 819 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 820 unsigned int k, struct snd_interval *c); 821 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 822 const struct snd_interval *b, struct snd_interval *c); 823 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask); 824 int snd_interval_ratnum(struct snd_interval *i, 825 unsigned int rats_count, struct snd_ratnum *rats, 826 unsigned int *nump, unsigned int *denp); 827 828 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 829 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 830 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 831 832 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 833 834 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 835 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 836 837 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 838 u_int32_t mask); 839 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 840 u_int64_t mask); 841 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 842 unsigned int min, unsigned int max); 843 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 844 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 845 unsigned int cond, 846 snd_pcm_hw_param_t var, 847 struct snd_pcm_hw_constraint_list *l); 848 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 849 unsigned int cond, 850 snd_pcm_hw_param_t var, 851 struct snd_pcm_hw_constraint_ratnums *r); 852 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 853 unsigned int cond, 854 snd_pcm_hw_param_t var, 855 struct snd_pcm_hw_constraint_ratdens *r); 856 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 857 unsigned int cond, 858 unsigned int width, 859 unsigned int msbits); 860 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 861 unsigned int cond, 862 snd_pcm_hw_param_t var, 863 unsigned long step); 864 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 865 unsigned int cond, 866 snd_pcm_hw_param_t var); 867 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 868 unsigned int cond, 869 int var, 870 snd_pcm_hw_rule_func_t func, void *private, 871 int dep, ...); 872 873 int snd_pcm_format_signed(snd_pcm_format_t format); 874 int snd_pcm_format_unsigned(snd_pcm_format_t format); 875 int snd_pcm_format_linear(snd_pcm_format_t format); 876 int snd_pcm_format_little_endian(snd_pcm_format_t format); 877 int snd_pcm_format_big_endian(snd_pcm_format_t format); 878 #if 0 /* just for DocBook */ 879 /** 880 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 881 * @format: the format to check 882 * 883 * Returns 1 if the given PCM format is CPU-endian, 0 if 884 * opposite, or a negative error code if endian not specified. 885 */ 886 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 887 #endif /* DocBook */ 888 #ifdef SNDRV_LITTLE_ENDIAN 889 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 890 #else 891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 892 #endif 893 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 894 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 895 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 896 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 897 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 898 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 899 900 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 901 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 902 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 903 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 904 unsigned int cmd, void *arg); 905 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 906 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 907 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 908 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 909 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 910 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 911 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream); 912 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks); 913 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream); 914 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 915 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 916 const void __user *buf, 917 snd_pcm_uframes_t frames); 918 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 919 void __user *buf, snd_pcm_uframes_t frames); 920 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 921 void __user **bufs, snd_pcm_uframes_t frames); 922 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 923 void __user **bufs, snd_pcm_uframes_t frames); 924 925 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 926 927 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 928 struct snd_dma_buffer *bufp) 929 { 930 struct snd_pcm_runtime *runtime = substream->runtime; 931 if (bufp) { 932 runtime->dma_buffer_p = bufp; 933 runtime->dma_area = bufp->area; 934 runtime->dma_addr = bufp->addr; 935 runtime->dma_bytes = bufp->bytes; 936 } else { 937 runtime->dma_buffer_p = NULL; 938 runtime->dma_area = NULL; 939 runtime->dma_addr = 0; 940 runtime->dma_bytes = 0; 941 } 942 } 943 944 /* 945 * Timer interface 946 */ 947 948 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 949 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 950 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 951 952 /* 953 * Memory 954 */ 955 956 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 957 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 958 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 959 int type, struct device *data, 960 size_t size, size_t max); 961 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 962 int type, void *data, 963 size_t size, size_t max); 964 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 965 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 966 967 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data) 968 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size) 969 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs) 970 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset); 971 972 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 973 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 974 { 975 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 976 atomic_inc(&substream->mmap_count); 977 } 978 979 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 980 { 981 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 982 atomic_dec(&substream->mmap_count); 983 } 984 985 /* mmap for io-memory area */ 986 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 987 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 988 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 989 #else 990 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 991 #define snd_pcm_lib_mmap_iomem NULL 992 #endif 993 994 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 995 { 996 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 997 } 998 999 /* 1000 * Misc 1001 */ 1002 1003 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1004 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1005 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1006 (IEC958_AES3_CON_FS_48000<<24)) 1007 1008 #endif /* __SOUND_PCM_H */ 1009