1 #ifndef __SOUND_PCM_H 2 #define __SOUND_PCM_H 3 4 /* 5 * Digital Audio (PCM) abstract layer 6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 7 * Abramo Bagnara <abramo@alsa-project.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26 #include <sound/asound.h> 27 #include <sound/memalloc.h> 28 #include <sound/minors.h> 29 #include <linux/poll.h> 30 #include <linux/mm.h> 31 #include <linux/bitops.h> 32 33 #define snd_pcm_substream_chip(substream) ((substream)->private_data) 34 #define snd_pcm_chip(pcm) ((pcm)->private_data) 35 36 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 37 #include "pcm_oss.h" 38 #endif 39 40 /* 41 * Hardware (lowlevel) section 42 */ 43 44 struct snd_pcm_hardware { 45 unsigned int info; /* SNDRV_PCM_INFO_* */ 46 u64 formats; /* SNDRV_PCM_FMTBIT_* */ 47 unsigned int rates; /* SNDRV_PCM_RATE_* */ 48 unsigned int rate_min; /* min rate */ 49 unsigned int rate_max; /* max rate */ 50 unsigned int channels_min; /* min channels */ 51 unsigned int channels_max; /* max channels */ 52 size_t buffer_bytes_max; /* max buffer size */ 53 size_t period_bytes_min; /* min period size */ 54 size_t period_bytes_max; /* max period size */ 55 unsigned int periods_min; /* min # of periods */ 56 unsigned int periods_max; /* max # of periods */ 57 size_t fifo_size; /* fifo size in bytes */ 58 }; 59 60 struct snd_pcm_substream; 61 62 struct snd_pcm_ops { 63 int (*open)(struct snd_pcm_substream *substream); 64 int (*close)(struct snd_pcm_substream *substream); 65 int (*ioctl)(struct snd_pcm_substream * substream, 66 unsigned int cmd, void *arg); 67 int (*hw_params)(struct snd_pcm_substream *substream, 68 struct snd_pcm_hw_params *params); 69 int (*hw_free)(struct snd_pcm_substream *substream); 70 int (*prepare)(struct snd_pcm_substream *substream); 71 int (*trigger)(struct snd_pcm_substream *substream, int cmd); 72 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); 73 int (*copy)(struct snd_pcm_substream *substream, int channel, 74 snd_pcm_uframes_t pos, 75 void __user *buf, snd_pcm_uframes_t count); 76 int (*silence)(struct snd_pcm_substream *substream, int channel, 77 snd_pcm_uframes_t pos, snd_pcm_uframes_t count); 78 struct page *(*page)(struct snd_pcm_substream *substream, 79 unsigned long offset); 80 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); 81 int (*ack)(struct snd_pcm_substream *substream); 82 }; 83 84 /* 85 * 86 */ 87 88 #if defined(CONFIG_SND_DYNAMIC_MINORS) 89 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2) 90 #else 91 #define SNDRV_PCM_DEVICES 8 92 #endif 93 94 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0) 95 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1) 96 97 #define SNDRV_PCM_IOCTL1_RESET 0 98 #define SNDRV_PCM_IOCTL1_INFO 1 99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 100 #define SNDRV_PCM_IOCTL1_GSTATE 3 101 102 #define SNDRV_PCM_TRIGGER_STOP 0 103 #define SNDRV_PCM_TRIGGER_START 1 104 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 105 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 106 #define SNDRV_PCM_TRIGGER_SUSPEND 5 107 #define SNDRV_PCM_TRIGGER_RESUME 6 108 109 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) 110 111 /* If you change this don't forget to change rates[] table in pcm_native.c */ 112 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */ 113 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */ 114 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */ 115 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */ 116 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */ 117 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */ 118 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */ 119 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */ 120 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */ 121 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */ 122 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */ 123 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */ 124 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */ 125 126 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */ 127 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */ 128 129 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ 130 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ 131 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) 132 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) 133 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ 134 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) 135 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ 136 SNDRV_PCM_RATE_192000) 137 #define SNDRV_PCM_FMTBIT_S8 (1ULL << SNDRV_PCM_FORMAT_S8) 138 #define SNDRV_PCM_FMTBIT_U8 (1ULL << SNDRV_PCM_FORMAT_U8) 139 #define SNDRV_PCM_FMTBIT_S16_LE (1ULL << SNDRV_PCM_FORMAT_S16_LE) 140 #define SNDRV_PCM_FMTBIT_S16_BE (1ULL << SNDRV_PCM_FORMAT_S16_BE) 141 #define SNDRV_PCM_FMTBIT_U16_LE (1ULL << SNDRV_PCM_FORMAT_U16_LE) 142 #define SNDRV_PCM_FMTBIT_U16_BE (1ULL << SNDRV_PCM_FORMAT_U16_BE) 143 #define SNDRV_PCM_FMTBIT_S24_LE (1ULL << SNDRV_PCM_FORMAT_S24_LE) 144 #define SNDRV_PCM_FMTBIT_S24_BE (1ULL << SNDRV_PCM_FORMAT_S24_BE) 145 #define SNDRV_PCM_FMTBIT_U24_LE (1ULL << SNDRV_PCM_FORMAT_U24_LE) 146 #define SNDRV_PCM_FMTBIT_U24_BE (1ULL << SNDRV_PCM_FORMAT_U24_BE) 147 #define SNDRV_PCM_FMTBIT_S32_LE (1ULL << SNDRV_PCM_FORMAT_S32_LE) 148 #define SNDRV_PCM_FMTBIT_S32_BE (1ULL << SNDRV_PCM_FORMAT_S32_BE) 149 #define SNDRV_PCM_FMTBIT_U32_LE (1ULL << SNDRV_PCM_FORMAT_U32_LE) 150 #define SNDRV_PCM_FMTBIT_U32_BE (1ULL << SNDRV_PCM_FORMAT_U32_BE) 151 #define SNDRV_PCM_FMTBIT_FLOAT_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE) 152 #define SNDRV_PCM_FMTBIT_FLOAT_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE) 153 #define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE) 154 #define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE) 155 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE) 156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE) 157 #define SNDRV_PCM_FMTBIT_MU_LAW (1ULL << SNDRV_PCM_FORMAT_MU_LAW) 158 #define SNDRV_PCM_FMTBIT_A_LAW (1ULL << SNDRV_PCM_FORMAT_A_LAW) 159 #define SNDRV_PCM_FMTBIT_IMA_ADPCM (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM) 160 #define SNDRV_PCM_FMTBIT_MPEG (1ULL << SNDRV_PCM_FORMAT_MPEG) 161 #define SNDRV_PCM_FMTBIT_GSM (1ULL << SNDRV_PCM_FORMAT_GSM) 162 #define SNDRV_PCM_FMTBIT_SPECIAL (1ULL << SNDRV_PCM_FORMAT_SPECIAL) 163 #define SNDRV_PCM_FMTBIT_S24_3LE (1ULL << SNDRV_PCM_FORMAT_S24_3LE) 164 #define SNDRV_PCM_FMTBIT_U24_3LE (1ULL << SNDRV_PCM_FORMAT_U24_3LE) 165 #define SNDRV_PCM_FMTBIT_S24_3BE (1ULL << SNDRV_PCM_FORMAT_S24_3BE) 166 #define SNDRV_PCM_FMTBIT_U24_3BE (1ULL << SNDRV_PCM_FORMAT_U24_3BE) 167 #define SNDRV_PCM_FMTBIT_S20_3LE (1ULL << SNDRV_PCM_FORMAT_S20_3LE) 168 #define SNDRV_PCM_FMTBIT_U20_3LE (1ULL << SNDRV_PCM_FORMAT_U20_3LE) 169 #define SNDRV_PCM_FMTBIT_S20_3BE (1ULL << SNDRV_PCM_FORMAT_S20_3BE) 170 #define SNDRV_PCM_FMTBIT_U20_3BE (1ULL << SNDRV_PCM_FORMAT_U20_3BE) 171 #define SNDRV_PCM_FMTBIT_S18_3LE (1ULL << SNDRV_PCM_FORMAT_S18_3LE) 172 #define SNDRV_PCM_FMTBIT_U18_3LE (1ULL << SNDRV_PCM_FORMAT_U18_3LE) 173 #define SNDRV_PCM_FMTBIT_S18_3BE (1ULL << SNDRV_PCM_FORMAT_S18_3BE) 174 #define SNDRV_PCM_FMTBIT_U18_3BE (1ULL << SNDRV_PCM_FORMAT_U18_3BE) 175 176 #ifdef SNDRV_LITTLE_ENDIAN 177 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 178 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 179 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 180 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 181 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 182 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 183 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 184 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 185 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 186 #endif 187 #ifdef SNDRV_BIG_ENDIAN 188 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 189 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 190 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 191 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 192 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 193 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 194 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 195 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 196 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 197 #endif 198 199 struct snd_pcm_file { 200 struct snd_pcm_substream *substream; 201 int no_compat_mmap; 202 }; 203 204 struct snd_pcm_hw_rule; 205 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 206 struct snd_pcm_hw_rule *rule); 207 208 struct snd_pcm_hw_rule { 209 unsigned int cond; 210 snd_pcm_hw_rule_func_t func; 211 int var; 212 int deps[4]; 213 void *private; 214 }; 215 216 struct snd_pcm_hw_constraints { 217 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 218 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 219 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 220 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 221 unsigned int rules_num; 222 unsigned int rules_all; 223 struct snd_pcm_hw_rule *rules; 224 }; 225 226 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 227 snd_pcm_hw_param_t var) 228 { 229 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 230 } 231 232 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 233 snd_pcm_hw_param_t var) 234 { 235 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 236 } 237 238 struct snd_ratnum { 239 unsigned int num; 240 unsigned int den_min, den_max, den_step; 241 }; 242 243 struct snd_ratden { 244 unsigned int num_min, num_max, num_step; 245 unsigned int den; 246 }; 247 248 struct snd_pcm_hw_constraint_ratnums { 249 int nrats; 250 struct snd_ratnum *rats; 251 }; 252 253 struct snd_pcm_hw_constraint_ratdens { 254 int nrats; 255 struct snd_ratden *rats; 256 }; 257 258 struct snd_pcm_hw_constraint_list { 259 unsigned int count; 260 unsigned int *list; 261 unsigned int mask; 262 }; 263 264 struct snd_pcm_runtime { 265 /* -- Status -- */ 266 struct snd_pcm_substream *trigger_master; 267 struct timespec trigger_tstamp; /* trigger timestamp */ 268 int overrange; 269 snd_pcm_uframes_t avail_max; 270 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 271 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ 272 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ 273 274 /* -- HW params -- */ 275 snd_pcm_access_t access; /* access mode */ 276 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 277 snd_pcm_subformat_t subformat; /* subformat */ 278 unsigned int rate; /* rate in Hz */ 279 unsigned int channels; /* channels */ 280 snd_pcm_uframes_t period_size; /* period size */ 281 unsigned int periods; /* periods */ 282 snd_pcm_uframes_t buffer_size; /* buffer size */ 283 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 284 size_t byte_align; 285 unsigned int frame_bits; 286 unsigned int sample_bits; 287 unsigned int info; 288 unsigned int rate_num; 289 unsigned int rate_den; 290 291 /* -- SW params -- */ 292 int tstamp_mode; /* mmap timestamp is updated */ 293 unsigned int period_step; 294 snd_pcm_uframes_t start_threshold; 295 snd_pcm_uframes_t stop_threshold; 296 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 297 noise is nearest than this */ 298 snd_pcm_uframes_t silence_size; /* Silence filling size */ 299 snd_pcm_uframes_t boundary; /* pointers wrap point */ 300 301 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 302 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 303 304 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 305 306 /* -- mmap -- */ 307 struct snd_pcm_mmap_status *status; 308 struct snd_pcm_mmap_control *control; 309 310 /* -- locking / scheduling -- */ 311 wait_queue_head_t sleep; 312 struct fasync_struct *fasync; 313 314 /* -- private section -- */ 315 void *private_data; 316 void (*private_free)(struct snd_pcm_runtime *runtime); 317 318 /* -- hardware description -- */ 319 struct snd_pcm_hardware hw; 320 struct snd_pcm_hw_constraints hw_constraints; 321 322 /* -- interrupt callbacks -- */ 323 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 324 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 325 326 /* -- timer -- */ 327 unsigned int timer_resolution; /* timer resolution */ 328 int tstamp_type; /* timestamp type */ 329 330 /* -- DMA -- */ 331 unsigned char *dma_area; /* DMA area */ 332 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 333 size_t dma_bytes; /* size of DMA area */ 334 335 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 336 337 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 338 /* -- OSS things -- */ 339 struct snd_pcm_oss_runtime oss; 340 #endif 341 }; 342 343 struct snd_pcm_group { /* keep linked substreams */ 344 spinlock_t lock; 345 struct list_head substreams; 346 int count; 347 }; 348 349 struct snd_pcm_substream { 350 struct snd_pcm *pcm; 351 struct snd_pcm_str *pstr; 352 void *private_data; /* copied from pcm->private_data */ 353 int number; 354 char name[32]; /* substream name */ 355 int stream; /* stream (direction) */ 356 char latency_id[20]; /* latency identifier */ 357 size_t buffer_bytes_max; /* limit ring buffer size */ 358 struct snd_dma_buffer dma_buffer; 359 unsigned int dma_buf_id; 360 size_t dma_max; 361 /* -- hardware operations -- */ 362 struct snd_pcm_ops *ops; 363 /* -- runtime information -- */ 364 struct snd_pcm_runtime *runtime; 365 /* -- timer section -- */ 366 struct snd_timer *timer; /* timer */ 367 unsigned timer_running: 1; /* time is running */ 368 /* -- next substream -- */ 369 struct snd_pcm_substream *next; 370 /* -- linked substreams -- */ 371 struct list_head link_list; /* linked list member */ 372 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 373 struct snd_pcm_group *group; /* pointer to current group */ 374 /* -- assigned files -- */ 375 void *file; 376 int ref_count; 377 atomic_t mmap_count; 378 unsigned int f_flags; 379 void (*pcm_release)(struct snd_pcm_substream *); 380 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 381 /* -- OSS things -- */ 382 struct snd_pcm_oss_substream oss; 383 #endif 384 #ifdef CONFIG_SND_VERBOSE_PROCFS 385 struct snd_info_entry *proc_root; 386 struct snd_info_entry *proc_info_entry; 387 struct snd_info_entry *proc_hw_params_entry; 388 struct snd_info_entry *proc_sw_params_entry; 389 struct snd_info_entry *proc_status_entry; 390 struct snd_info_entry *proc_prealloc_entry; 391 struct snd_info_entry *proc_prealloc_max_entry; 392 #endif 393 /* misc flags */ 394 unsigned int hw_opened: 1; 395 }; 396 397 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 398 399 400 struct snd_pcm_str { 401 int stream; /* stream (direction) */ 402 struct snd_pcm *pcm; 403 /* -- substreams -- */ 404 unsigned int substream_count; 405 unsigned int substream_opened; 406 struct snd_pcm_substream *substream; 407 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 408 /* -- OSS things -- */ 409 struct snd_pcm_oss_stream oss; 410 #endif 411 #ifdef CONFIG_SND_VERBOSE_PROCFS 412 struct snd_info_entry *proc_root; 413 struct snd_info_entry *proc_info_entry; 414 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 415 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 416 struct snd_info_entry *proc_xrun_debug_entry; 417 #endif 418 #endif 419 }; 420 421 struct snd_pcm { 422 struct snd_card *card; 423 struct list_head list; 424 int device; /* device number */ 425 unsigned int info_flags; 426 unsigned short dev_class; 427 unsigned short dev_subclass; 428 char id[64]; 429 char name[80]; 430 struct snd_pcm_str streams[2]; 431 struct mutex open_mutex; 432 wait_queue_head_t open_wait; 433 void *private_data; 434 void (*private_free) (struct snd_pcm *pcm); 435 struct device *dev; /* actual hw device this belongs to */ 436 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 437 struct snd_pcm_oss oss; 438 #endif 439 }; 440 441 struct snd_pcm_notify { 442 int (*n_register) (struct snd_pcm * pcm); 443 int (*n_disconnect) (struct snd_pcm * pcm); 444 int (*n_unregister) (struct snd_pcm * pcm); 445 struct list_head list; 446 }; 447 448 /* 449 * Registering 450 */ 451 452 extern const struct file_operations snd_pcm_f_ops[2]; 453 454 int snd_pcm_new(struct snd_card *card, const char *id, int device, 455 int playback_count, int capture_count, 456 struct snd_pcm **rpcm); 457 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 458 459 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 460 461 /* 462 * Native I/O 463 */ 464 465 extern rwlock_t snd_pcm_link_rwlock; 466 467 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 468 int snd_pcm_info_user(struct snd_pcm_substream *substream, 469 struct snd_pcm_info __user *info); 470 int snd_pcm_status(struct snd_pcm_substream *substream, 471 struct snd_pcm_status *status); 472 int snd_pcm_start(struct snd_pcm_substream *substream); 473 int snd_pcm_stop(struct snd_pcm_substream *substream, int status); 474 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 475 #ifdef CONFIG_PM 476 int snd_pcm_suspend(struct snd_pcm_substream *substream); 477 int snd_pcm_suspend_all(struct snd_pcm *pcm); 478 #endif 479 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 480 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 481 struct snd_pcm_substream **rsubstream); 482 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 483 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 484 struct snd_pcm_substream **rsubstream); 485 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 486 void snd_pcm_vma_notify_data(void *client, void *data); 487 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 488 489 #if BITS_PER_LONG >= 64 490 491 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 492 { 493 *rem = *n % div; 494 *n /= div; 495 } 496 497 #elif defined(i386) 498 499 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 500 { 501 u_int32_t low, high; 502 low = *n & 0xffffffff; 503 high = *n >> 32; 504 if (high) { 505 u_int32_t high1 = high % div; 506 high /= div; 507 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1)); 508 *n = (u_int64_t)high << 32 | low; 509 } else { 510 *n = low / div; 511 *rem = low % div; 512 } 513 } 514 #else 515 516 static inline void divl(u_int32_t high, u_int32_t low, 517 u_int32_t div, 518 u_int32_t *q, u_int32_t *r) 519 { 520 u_int64_t n = (u_int64_t)high << 32 | low; 521 u_int64_t d = (u_int64_t)div << 31; 522 u_int32_t q1 = 0; 523 int c = 32; 524 while (n > 0xffffffffU) { 525 q1 <<= 1; 526 if (n >= d) { 527 n -= d; 528 q1 |= 1; 529 } 530 d >>= 1; 531 c--; 532 } 533 q1 <<= c; 534 if (n) { 535 low = n; 536 *q = q1 | (low / div); 537 *r = low % div; 538 } else { 539 *r = 0; 540 *q = q1; 541 } 542 return; 543 } 544 545 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 546 { 547 u_int32_t low, high; 548 low = *n & 0xffffffff; 549 high = *n >> 32; 550 if (high) { 551 u_int32_t high1 = high % div; 552 u_int32_t low1 = low; 553 high /= div; 554 divl(high1, low1, div, &low, rem); 555 *n = (u_int64_t)high << 32 | low; 556 } else { 557 *n = low / div; 558 *rem = low % div; 559 } 560 } 561 #endif 562 563 /* 564 * PCM library 565 */ 566 567 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 568 { 569 return substream->group != &substream->self_group; 570 } 571 572 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 573 { 574 read_lock(&snd_pcm_link_rwlock); 575 spin_lock(&substream->self_group.lock); 576 } 577 578 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 579 { 580 spin_unlock(&substream->self_group.lock); 581 read_unlock(&snd_pcm_link_rwlock); 582 } 583 584 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 585 { 586 read_lock_irq(&snd_pcm_link_rwlock); 587 spin_lock(&substream->self_group.lock); 588 } 589 590 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 591 { 592 spin_unlock(&substream->self_group.lock); 593 read_unlock_irq(&snd_pcm_link_rwlock); 594 } 595 596 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 597 do { \ 598 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 599 spin_lock(&substream->self_group.lock); \ 600 } while (0) 601 602 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 603 do { \ 604 spin_unlock(&substream->self_group.lock); \ 605 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 606 } while (0) 607 608 #define snd_pcm_group_for_each_entry(s, substream) \ 609 list_for_each_entry(s, &substream->group->substreams, link_list) 610 611 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 612 { 613 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 614 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 615 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 616 } 617 618 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 619 { 620 return size * 8 / runtime->sample_bits; 621 } 622 623 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 624 { 625 return size * 8 / runtime->frame_bits; 626 } 627 628 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 629 { 630 return size * runtime->sample_bits / 8; 631 } 632 633 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 634 { 635 return size * runtime->frame_bits / 8; 636 } 637 638 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 639 { 640 return bytes % runtime->byte_align == 0; 641 } 642 643 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 644 { 645 struct snd_pcm_runtime *runtime = substream->runtime; 646 return frames_to_bytes(runtime, runtime->buffer_size); 647 } 648 649 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 650 { 651 struct snd_pcm_runtime *runtime = substream->runtime; 652 return frames_to_bytes(runtime, runtime->period_size); 653 } 654 655 /* 656 * result is: 0 ... (boundary - 1) 657 */ 658 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 659 { 660 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 661 if (avail < 0) 662 avail += runtime->boundary; 663 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 664 avail -= runtime->boundary; 665 return avail; 666 } 667 668 /* 669 * result is: 0 ... (boundary - 1) 670 */ 671 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 672 { 673 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 674 if (avail < 0) 675 avail += runtime->boundary; 676 return avail; 677 } 678 679 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 680 { 681 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 682 } 683 684 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 685 { 686 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 687 } 688 689 /** 690 * snd_pcm_playback_ready - check whether the playback buffer is available 691 * @substream: the pcm substream instance 692 * 693 * Checks whether enough free space is available on the playback buffer. 694 * 695 * Returns non-zero if available, or zero if not. 696 */ 697 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 698 { 699 struct snd_pcm_runtime *runtime = substream->runtime; 700 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 701 } 702 703 /** 704 * snd_pcm_capture_ready - check whether the capture buffer is available 705 * @substream: the pcm substream instance 706 * 707 * Checks whether enough capture data is available on the capture buffer. 708 * 709 * Returns non-zero if available, or zero if not. 710 */ 711 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 712 { 713 struct snd_pcm_runtime *runtime = substream->runtime; 714 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 715 } 716 717 /** 718 * snd_pcm_playback_data - check whether any data exists on the playback buffer 719 * @substream: the pcm substream instance 720 * 721 * Checks whether any data exists on the playback buffer. If stop_threshold 722 * is bigger or equal to boundary, then this function returns always non-zero. 723 * 724 * Returns non-zero if exists, or zero if not. 725 */ 726 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 727 { 728 struct snd_pcm_runtime *runtime = substream->runtime; 729 730 if (runtime->stop_threshold >= runtime->boundary) 731 return 1; 732 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 733 } 734 735 /** 736 * snd_pcm_playback_empty - check whether the playback buffer is empty 737 * @substream: the pcm substream instance 738 * 739 * Checks whether the playback buffer is empty. 740 * 741 * Returns non-zero if empty, or zero if not. 742 */ 743 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 744 { 745 struct snd_pcm_runtime *runtime = substream->runtime; 746 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 747 } 748 749 /** 750 * snd_pcm_capture_empty - check whether the capture buffer is empty 751 * @substream: the pcm substream instance 752 * 753 * Checks whether the capture buffer is empty. 754 * 755 * Returns non-zero if empty, or zero if not. 756 */ 757 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 758 { 759 struct snd_pcm_runtime *runtime = substream->runtime; 760 return snd_pcm_capture_avail(runtime) == 0; 761 } 762 763 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 764 struct snd_pcm_substream *master) 765 { 766 substream->runtime->trigger_master = master; 767 } 768 769 static inline int hw_is_mask(int var) 770 { 771 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 772 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 773 } 774 775 static inline int hw_is_interval(int var) 776 { 777 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 778 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 779 } 780 781 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 782 snd_pcm_hw_param_t var) 783 { 784 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 785 } 786 787 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 788 snd_pcm_hw_param_t var) 789 { 790 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 791 } 792 793 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 794 snd_pcm_hw_param_t var) 795 { 796 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 797 } 798 799 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 800 snd_pcm_hw_param_t var) 801 { 802 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 803 } 804 805 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS)) 806 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT)) 807 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 808 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 809 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 810 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 811 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 812 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 813 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 814 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min 815 816 817 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 818 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 819 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 820 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 821 unsigned int k, struct snd_interval *c); 822 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 823 const struct snd_interval *b, struct snd_interval *c); 824 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask); 825 int snd_interval_ratnum(struct snd_interval *i, 826 unsigned int rats_count, struct snd_ratnum *rats, 827 unsigned int *nump, unsigned int *denp); 828 829 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 830 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 831 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 832 833 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 834 835 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 836 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 837 838 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 839 u_int32_t mask); 840 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 841 u_int64_t mask); 842 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 843 unsigned int min, unsigned int max); 844 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 845 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 846 unsigned int cond, 847 snd_pcm_hw_param_t var, 848 struct snd_pcm_hw_constraint_list *l); 849 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 850 unsigned int cond, 851 snd_pcm_hw_param_t var, 852 struct snd_pcm_hw_constraint_ratnums *r); 853 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 854 unsigned int cond, 855 snd_pcm_hw_param_t var, 856 struct snd_pcm_hw_constraint_ratdens *r); 857 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 858 unsigned int cond, 859 unsigned int width, 860 unsigned int msbits); 861 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 862 unsigned int cond, 863 snd_pcm_hw_param_t var, 864 unsigned long step); 865 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 866 unsigned int cond, 867 snd_pcm_hw_param_t var); 868 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 869 unsigned int cond, 870 int var, 871 snd_pcm_hw_rule_func_t func, void *private, 872 int dep, ...); 873 874 int snd_pcm_format_signed(snd_pcm_format_t format); 875 int snd_pcm_format_unsigned(snd_pcm_format_t format); 876 int snd_pcm_format_linear(snd_pcm_format_t format); 877 int snd_pcm_format_little_endian(snd_pcm_format_t format); 878 int snd_pcm_format_big_endian(snd_pcm_format_t format); 879 #if 0 /* just for DocBook */ 880 /** 881 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 882 * @format: the format to check 883 * 884 * Returns 1 if the given PCM format is CPU-endian, 0 if 885 * opposite, or a negative error code if endian not specified. 886 */ 887 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 888 #endif /* DocBook */ 889 #ifdef SNDRV_LITTLE_ENDIAN 890 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 891 #else 892 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 893 #endif 894 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 895 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 896 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 897 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 898 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 899 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 900 901 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 902 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 903 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 904 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 905 unsigned int cmd, void *arg); 906 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 907 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 908 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 909 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 910 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 911 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 912 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 913 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 914 const void __user *buf, 915 snd_pcm_uframes_t frames); 916 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 917 void __user *buf, snd_pcm_uframes_t frames); 918 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 919 void __user **bufs, snd_pcm_uframes_t frames); 920 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 921 void __user **bufs, snd_pcm_uframes_t frames); 922 923 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 924 925 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 926 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 927 928 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 929 struct snd_dma_buffer *bufp) 930 { 931 struct snd_pcm_runtime *runtime = substream->runtime; 932 if (bufp) { 933 runtime->dma_buffer_p = bufp; 934 runtime->dma_area = bufp->area; 935 runtime->dma_addr = bufp->addr; 936 runtime->dma_bytes = bufp->bytes; 937 } else { 938 runtime->dma_buffer_p = NULL; 939 runtime->dma_area = NULL; 940 runtime->dma_addr = 0; 941 runtime->dma_bytes = 0; 942 } 943 } 944 945 /* 946 * Timer interface 947 */ 948 949 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 950 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 951 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 952 953 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 954 struct timespec *tv) 955 { 956 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 957 do_posix_clock_monotonic_gettime(tv); 958 else 959 getnstimeofday(tv); 960 } 961 962 /* 963 * Memory 964 */ 965 966 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 967 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 968 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 969 int type, struct device *data, 970 size_t size, size_t max); 971 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 972 int type, void *data, 973 size_t size, size_t max); 974 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 975 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 976 977 /* 978 * SG-buffer handling 979 */ 980 #define snd_pcm_substream_sgbuf(substream) \ 981 ((substream)->runtime->dma_buffer_p->private_data) 982 983 static inline dma_addr_t 984 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 985 { 986 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 987 return snd_sgbuf_get_addr(sg, ofs); 988 } 989 990 static inline void * 991 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 992 { 993 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 994 return snd_sgbuf_get_ptr(sg, ofs); 995 } 996 997 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 998 unsigned long offset); 999 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1000 unsigned int ofs, unsigned int size); 1001 1002 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1003 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1004 { 1005 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1006 atomic_inc(&substream->mmap_count); 1007 } 1008 1009 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1010 { 1011 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1012 atomic_dec(&substream->mmap_count); 1013 } 1014 1015 /* mmap for io-memory area */ 1016 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1017 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1018 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1019 #else 1020 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1021 #define snd_pcm_lib_mmap_iomem NULL 1022 #endif 1023 1024 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1025 { 1026 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1027 } 1028 1029 /* 1030 * Misc 1031 */ 1032 1033 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1034 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1035 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1036 (IEC958_AES3_CON_FS_48000<<24)) 1037 1038 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1039 1040 #endif /* __SOUND_PCM_H */ 1041