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 atomic_t mmap_count; 304 305 /* -- locking / scheduling -- */ 306 wait_queue_head_t sleep; 307 struct timer_list tick_timer; 308 struct fasync_struct *fasync; 309 310 /* -- private section -- */ 311 void *private_data; 312 void (*private_free)(struct snd_pcm_runtime *runtime); 313 314 /* -- hardware description -- */ 315 struct snd_pcm_hardware hw; 316 struct snd_pcm_hw_constraints hw_constraints; 317 318 /* -- interrupt callbacks -- */ 319 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 320 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 321 322 /* -- timer -- */ 323 unsigned int timer_resolution; /* timer resolution */ 324 325 /* -- DMA -- */ 326 unsigned char *dma_area; /* DMA area */ 327 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 328 size_t dma_bytes; /* size of DMA area */ 329 330 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 331 332 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 333 /* -- OSS things -- */ 334 struct snd_pcm_oss_runtime oss; 335 #endif 336 }; 337 338 struct snd_pcm_group { /* keep linked substreams */ 339 spinlock_t lock; 340 struct list_head substreams; 341 int count; 342 }; 343 344 struct snd_pcm_substream { 345 struct snd_pcm *pcm; 346 struct snd_pcm_str *pstr; 347 void *private_data; /* copied from pcm->private_data */ 348 int number; 349 char name[32]; /* substream name */ 350 int stream; /* stream (direction) */ 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 struct snd_pcm_file *file; 371 struct file *ffile; 372 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 373 /* -- OSS things -- */ 374 struct snd_pcm_oss_substream oss; 375 #endif 376 struct snd_info_entry *proc_root; 377 struct snd_info_entry *proc_info_entry; 378 struct snd_info_entry *proc_hw_params_entry; 379 struct snd_info_entry *proc_sw_params_entry; 380 struct snd_info_entry *proc_status_entry; 381 struct snd_info_entry *proc_prealloc_entry; 382 /* misc flags */ 383 unsigned int no_mmap_ctrl: 1; 384 }; 385 386 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 387 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL || ((substream)->oss.file != NULL)) 388 #else 389 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL) 390 #endif 391 392 393 struct snd_pcm_str { 394 int stream; /* stream (direction) */ 395 struct snd_pcm *pcm; 396 /* -- substreams -- */ 397 unsigned int substream_count; 398 unsigned int substream_opened; 399 struct snd_pcm_substream *substream; 400 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 401 /* -- OSS things -- */ 402 struct snd_pcm_oss_stream oss; 403 #endif 404 struct snd_pcm_file *files; 405 struct snd_info_entry *proc_root; 406 struct snd_info_entry *proc_info_entry; 407 #ifdef CONFIG_SND_DEBUG 408 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 409 struct snd_info_entry *proc_xrun_debug_entry; 410 #endif 411 }; 412 413 struct snd_pcm { 414 struct snd_card *card; 415 struct list_head list; 416 unsigned int device; /* device number */ 417 unsigned int info_flags; 418 unsigned short dev_class; 419 unsigned short dev_subclass; 420 char id[64]; 421 char name[80]; 422 struct snd_pcm_str streams[2]; 423 struct semaphore open_mutex; 424 wait_queue_head_t open_wait; 425 void *private_data; 426 void (*private_free) (struct snd_pcm *pcm); 427 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 428 struct snd_pcm_oss oss; 429 #endif 430 }; 431 432 struct snd_pcm_notify { 433 int (*n_register) (struct snd_pcm * pcm); 434 int (*n_disconnect) (struct snd_pcm * pcm); 435 int (*n_unregister) (struct snd_pcm * pcm); 436 struct list_head list; 437 }; 438 439 /* 440 * Registering 441 */ 442 443 extern struct file_operations snd_pcm_f_ops[2]; 444 445 int snd_pcm_new(struct snd_card *card, char *id, int device, 446 int playback_count, int capture_count, 447 struct snd_pcm **rpcm); 448 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 449 450 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 451 452 /* 453 * Native I/O 454 */ 455 456 extern rwlock_t snd_pcm_link_rwlock; 457 458 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 459 int snd_pcm_info_user(struct snd_pcm_substream *substream, 460 struct snd_pcm_info __user *info); 461 int snd_pcm_status(struct snd_pcm_substream *substream, 462 struct snd_pcm_status *status); 463 int snd_pcm_prepare(struct snd_pcm_substream *substream); 464 int snd_pcm_start(struct snd_pcm_substream *substream); 465 int snd_pcm_stop(struct snd_pcm_substream *substream, int status); 466 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 467 #ifdef CONFIG_PM 468 int snd_pcm_suspend(struct snd_pcm_substream *substream); 469 int snd_pcm_suspend_all(struct snd_pcm *pcm); 470 #endif 471 int snd_pcm_kernel_playback_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 472 int snd_pcm_kernel_capture_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 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 snd_pcm_substream **rsubstream); 475 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 476 void snd_pcm_vma_notify_data(void *client, void *data); 477 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 478 479 #if BITS_PER_LONG >= 64 480 481 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 482 { 483 *rem = *n % div; 484 *n /= div; 485 } 486 487 #elif defined(i386) 488 489 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 490 { 491 u_int32_t low, high; 492 low = *n & 0xffffffff; 493 high = *n >> 32; 494 if (high) { 495 u_int32_t high1 = high % div; 496 high /= div; 497 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1)); 498 *n = (u_int64_t)high << 32 | low; 499 } else { 500 *n = low / div; 501 *rem = low % div; 502 } 503 } 504 #else 505 506 static inline void divl(u_int32_t high, u_int32_t low, 507 u_int32_t div, 508 u_int32_t *q, u_int32_t *r) 509 { 510 u_int64_t n = (u_int64_t)high << 32 | low; 511 u_int64_t d = (u_int64_t)div << 31; 512 u_int32_t q1 = 0; 513 int c = 32; 514 while (n > 0xffffffffU) { 515 q1 <<= 1; 516 if (n >= d) { 517 n -= d; 518 q1 |= 1; 519 } 520 d >>= 1; 521 c--; 522 } 523 q1 <<= c; 524 if (n) { 525 low = n; 526 *q = q1 | (low / div); 527 *r = low % div; 528 } else { 529 *r = 0; 530 *q = q1; 531 } 532 return; 533 } 534 535 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 536 { 537 u_int32_t low, high; 538 low = *n & 0xffffffff; 539 high = *n >> 32; 540 if (high) { 541 u_int32_t high1 = high % div; 542 u_int32_t low1 = low; 543 high /= div; 544 divl(high1, low1, div, &low, rem); 545 *n = (u_int64_t)high << 32 | low; 546 } else { 547 *n = low / div; 548 *rem = low % div; 549 } 550 } 551 #endif 552 553 /* 554 * PCM library 555 */ 556 557 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 558 { 559 return substream->group != &substream->self_group; 560 } 561 562 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 563 { 564 read_lock(&snd_pcm_link_rwlock); 565 spin_lock(&substream->self_group.lock); 566 } 567 568 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 569 { 570 spin_unlock(&substream->self_group.lock); 571 read_unlock(&snd_pcm_link_rwlock); 572 } 573 574 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 575 { 576 read_lock_irq(&snd_pcm_link_rwlock); 577 spin_lock(&substream->self_group.lock); 578 } 579 580 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 581 { 582 spin_unlock(&substream->self_group.lock); 583 read_unlock_irq(&snd_pcm_link_rwlock); 584 } 585 586 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 587 do { \ 588 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 589 spin_lock(&substream->self_group.lock); \ 590 } while (0) 591 592 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 593 do { \ 594 spin_unlock(&substream->self_group.lock); \ 595 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 596 } while (0) 597 598 #define snd_pcm_group_for_each(pos, substream) \ 599 list_for_each(pos, &substream->group->substreams) 600 601 #define snd_pcm_group_substream_entry(pos) \ 602 list_entry(pos, struct snd_pcm_substream, link_list) 603 604 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 605 { 606 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 607 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 608 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 609 } 610 611 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 612 { 613 return size * 8 / runtime->sample_bits; 614 } 615 616 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 617 { 618 return size * 8 / runtime->frame_bits; 619 } 620 621 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 622 { 623 return size * runtime->sample_bits / 8; 624 } 625 626 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 627 { 628 return size * runtime->frame_bits / 8; 629 } 630 631 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 632 { 633 return bytes % runtime->byte_align == 0; 634 } 635 636 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 637 { 638 struct snd_pcm_runtime *runtime = substream->runtime; 639 return frames_to_bytes(runtime, runtime->buffer_size); 640 } 641 642 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 643 { 644 struct snd_pcm_runtime *runtime = substream->runtime; 645 return frames_to_bytes(runtime, runtime->period_size); 646 } 647 648 /* 649 * result is: 0 ... (boundary - 1) 650 */ 651 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 652 { 653 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 654 if (avail < 0) 655 avail += runtime->boundary; 656 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 657 avail -= runtime->boundary; 658 return avail; 659 } 660 661 /* 662 * result is: 0 ... (boundary - 1) 663 */ 664 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 665 { 666 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 667 if (avail < 0) 668 avail += runtime->boundary; 669 return avail; 670 } 671 672 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 673 { 674 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 675 } 676 677 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 678 { 679 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 680 } 681 682 /** 683 * snd_pcm_playback_ready - check whether the playback buffer is available 684 * @substream: the pcm substream instance 685 * 686 * Checks whether enough free space is available on the playback buffer. 687 * 688 * Returns non-zero if available, or zero if not. 689 */ 690 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 691 { 692 struct snd_pcm_runtime *runtime = substream->runtime; 693 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 694 } 695 696 /** 697 * snd_pcm_capture_ready - check whether the capture buffer is available 698 * @substream: the pcm substream instance 699 * 700 * Checks whether enough capture data is available on the capture buffer. 701 * 702 * Returns non-zero if available, or zero if not. 703 */ 704 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 705 { 706 struct snd_pcm_runtime *runtime = substream->runtime; 707 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 708 } 709 710 /** 711 * snd_pcm_playback_data - check whether any data exists on the playback buffer 712 * @substream: the pcm substream instance 713 * 714 * Checks whether any data exists on the playback buffer. If stop_threshold 715 * is bigger or equal to boundary, then this function returns always non-zero. 716 * 717 * Returns non-zero if exists, or zero if not. 718 */ 719 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 720 { 721 struct snd_pcm_runtime *runtime = substream->runtime; 722 723 if (runtime->stop_threshold >= runtime->boundary) 724 return 1; 725 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 726 } 727 728 /** 729 * snd_pcm_playback_empty - check whether the playback buffer is empty 730 * @substream: the pcm substream instance 731 * 732 * Checks whether the playback buffer is empty. 733 * 734 * Returns non-zero if empty, or zero if not. 735 */ 736 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 737 { 738 struct snd_pcm_runtime *runtime = substream->runtime; 739 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 740 } 741 742 /** 743 * snd_pcm_capture_empty - check whether the capture buffer is empty 744 * @substream: the pcm substream instance 745 * 746 * Checks whether the capture buffer is empty. 747 * 748 * Returns non-zero if empty, or zero if not. 749 */ 750 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 751 { 752 struct snd_pcm_runtime *runtime = substream->runtime; 753 return snd_pcm_capture_avail(runtime) == 0; 754 } 755 756 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 757 struct snd_pcm_substream *master) 758 { 759 substream->runtime->trigger_master = master; 760 } 761 762 static inline int hw_is_mask(int var) 763 { 764 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 765 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 766 } 767 768 static inline int hw_is_interval(int var) 769 { 770 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 771 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 772 } 773 774 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 775 snd_pcm_hw_param_t var) 776 { 777 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 778 } 779 780 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 781 snd_pcm_hw_param_t var) 782 { 783 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 784 } 785 786 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 787 snd_pcm_hw_param_t var) 788 { 789 return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var); 790 } 791 792 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 793 snd_pcm_hw_param_t var) 794 { 795 return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var); 796 } 797 798 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS)) 799 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT)) 800 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 801 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 802 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 803 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 804 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 805 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 806 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 807 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min 808 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min 809 810 811 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 812 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 813 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 814 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 815 unsigned int k, struct snd_interval *c); 816 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 817 const struct snd_interval *b, struct snd_interval *c); 818 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask); 819 int snd_interval_ratnum(struct snd_interval *i, 820 unsigned int rats_count, struct snd_ratnum *rats, 821 unsigned int *nump, unsigned int *denp); 822 823 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 824 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 825 int snd_pcm_hw_param_near(struct snd_pcm_substream *substream, 826 struct snd_pcm_hw_params *params, 827 snd_pcm_hw_param_t var, 828 unsigned int val, int *dir); 829 int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm, 830 struct snd_pcm_hw_params *params, 831 snd_pcm_hw_param_t var, 832 unsigned int val, int dir); 833 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 834 835 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 836 837 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 838 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 839 840 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 841 u_int32_t mask); 842 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 843 u_int64_t mask); 844 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 845 unsigned int min, unsigned int max); 846 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 847 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 848 unsigned int cond, 849 snd_pcm_hw_param_t var, 850 struct snd_pcm_hw_constraint_list *l); 851 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 852 unsigned int cond, 853 snd_pcm_hw_param_t var, 854 struct snd_pcm_hw_constraint_ratnums *r); 855 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 856 unsigned int cond, 857 snd_pcm_hw_param_t var, 858 struct snd_pcm_hw_constraint_ratdens *r); 859 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 860 unsigned int cond, 861 unsigned int width, 862 unsigned int msbits); 863 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 864 unsigned int cond, 865 snd_pcm_hw_param_t var, 866 unsigned long step); 867 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 868 unsigned int cond, 869 snd_pcm_hw_param_t var); 870 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 871 unsigned int cond, 872 int var, 873 snd_pcm_hw_rule_func_t func, void *private, 874 int dep, ...); 875 876 int snd_pcm_format_signed(snd_pcm_format_t format); 877 int snd_pcm_format_unsigned(snd_pcm_format_t format); 878 int snd_pcm_format_linear(snd_pcm_format_t format); 879 int snd_pcm_format_little_endian(snd_pcm_format_t format); 880 int snd_pcm_format_big_endian(snd_pcm_format_t format); 881 #if 0 /* just for DocBook */ 882 /** 883 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 884 * @format: the format to check 885 * 886 * Returns 1 if the given PCM format is CPU-endian, 0 if 887 * opposite, or a negative error code if endian not specified. 888 */ 889 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 890 #endif /* DocBook */ 891 #ifdef SNDRV_LITTLE_ENDIAN 892 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 893 #else 894 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 895 #endif 896 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 897 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 898 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 899 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 900 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 901 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 902 const char *snd_pcm_format_name(snd_pcm_format_t format); 903 904 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 905 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 906 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 907 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 908 unsigned int cmd, void *arg); 909 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 910 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 911 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 912 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 913 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 914 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 915 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream); 916 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks); 917 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream); 918 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 919 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 920 const void __user *buf, 921 snd_pcm_uframes_t frames); 922 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 923 void __user *buf, snd_pcm_uframes_t frames); 924 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 925 void __user **bufs, snd_pcm_uframes_t frames); 926 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 927 void __user **bufs, snd_pcm_uframes_t frames); 928 929 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 930 931 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 932 struct snd_dma_buffer *bufp) 933 { 934 struct snd_pcm_runtime *runtime = substream->runtime; 935 if (bufp) { 936 runtime->dma_buffer_p = bufp; 937 runtime->dma_area = bufp->area; 938 runtime->dma_addr = bufp->addr; 939 runtime->dma_bytes = bufp->bytes; 940 } else { 941 runtime->dma_buffer_p = NULL; 942 runtime->dma_area = NULL; 943 runtime->dma_addr = 0; 944 runtime->dma_bytes = 0; 945 } 946 } 947 948 /* 949 * Timer interface 950 */ 951 952 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 953 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 954 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 955 956 /* 957 * Memory 958 */ 959 960 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 961 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 962 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 963 int type, struct device *data, 964 size_t size, size_t max); 965 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 966 int type, void *data, 967 size_t size, size_t max); 968 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 969 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 970 971 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data) 972 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size) 973 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs) 974 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset); 975 976 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 977 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 978 { 979 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 980 atomic_inc(&substream->runtime->mmap_count); 981 } 982 983 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 984 { 985 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 986 atomic_dec(&substream->runtime->mmap_count); 987 } 988 989 /* mmap for io-memory area */ 990 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 991 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 992 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 993 #else 994 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 995 #define snd_pcm_lib_mmap_iomem NULL 996 #endif 997 998 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 999 { 1000 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1001 } 1002 1003 /* 1004 * Misc 1005 */ 1006 1007 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1008 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1009 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1010 (IEC958_AES3_CON_FS_48000<<24)) 1011 1012 #endif /* __SOUND_PCM_H */ 1013