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*/ 272 273 /* -- HW params -- */ 274 snd_pcm_access_t access; /* access mode */ 275 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 276 snd_pcm_subformat_t subformat; /* subformat */ 277 unsigned int rate; /* rate in Hz */ 278 unsigned int channels; /* channels */ 279 snd_pcm_uframes_t period_size; /* period size */ 280 unsigned int periods; /* periods */ 281 snd_pcm_uframes_t buffer_size; /* buffer size */ 282 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 283 size_t byte_align; 284 unsigned int frame_bits; 285 unsigned int sample_bits; 286 unsigned int info; 287 unsigned int rate_num; 288 unsigned int rate_den; 289 290 /* -- SW params -- */ 291 int tstamp_mode; /* mmap timestamp is updated */ 292 unsigned int period_step; 293 snd_pcm_uframes_t start_threshold; 294 snd_pcm_uframes_t stop_threshold; 295 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 296 noise is nearest than this */ 297 snd_pcm_uframes_t silence_size; /* Silence filling size */ 298 snd_pcm_uframes_t boundary; /* pointers wrap point */ 299 300 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 301 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 302 303 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 304 305 /* -- mmap -- */ 306 struct snd_pcm_mmap_status *status; 307 struct snd_pcm_mmap_control *control; 308 309 /* -- locking / scheduling -- */ 310 wait_queue_head_t sleep; 311 struct fasync_struct *fasync; 312 313 /* -- private section -- */ 314 void *private_data; 315 void (*private_free)(struct snd_pcm_runtime *runtime); 316 317 /* -- hardware description -- */ 318 struct snd_pcm_hardware hw; 319 struct snd_pcm_hw_constraints hw_constraints; 320 321 /* -- interrupt callbacks -- */ 322 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 323 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 324 325 /* -- timer -- */ 326 unsigned int timer_resolution; /* timer resolution */ 327 int tstamp_type; /* timestamp type */ 328 329 /* -- DMA -- */ 330 unsigned char *dma_area; /* DMA area */ 331 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 332 size_t dma_bytes; /* size of DMA area */ 333 334 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 335 336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 337 /* -- OSS things -- */ 338 struct snd_pcm_oss_runtime oss; 339 #endif 340 }; 341 342 struct snd_pcm_group { /* keep linked substreams */ 343 spinlock_t lock; 344 struct list_head substreams; 345 int count; 346 }; 347 348 struct snd_pcm_substream { 349 struct snd_pcm *pcm; 350 struct snd_pcm_str *pstr; 351 void *private_data; /* copied from pcm->private_data */ 352 int number; 353 char name[32]; /* substream name */ 354 int stream; /* stream (direction) */ 355 char latency_id[20]; /* latency identifier */ 356 size_t buffer_bytes_max; /* limit ring buffer size */ 357 struct snd_dma_buffer dma_buffer; 358 unsigned int dma_buf_id; 359 size_t dma_max; 360 /* -- hardware operations -- */ 361 struct snd_pcm_ops *ops; 362 /* -- runtime information -- */ 363 struct snd_pcm_runtime *runtime; 364 /* -- timer section -- */ 365 struct snd_timer *timer; /* timer */ 366 unsigned timer_running: 1; /* time is running */ 367 /* -- next substream -- */ 368 struct snd_pcm_substream *next; 369 /* -- linked substreams -- */ 370 struct list_head link_list; /* linked list member */ 371 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 372 struct snd_pcm_group *group; /* pointer to current group */ 373 /* -- assigned files -- */ 374 void *file; 375 int ref_count; 376 atomic_t mmap_count; 377 unsigned int f_flags; 378 void (*pcm_release)(struct snd_pcm_substream *); 379 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 380 /* -- OSS things -- */ 381 struct snd_pcm_oss_substream oss; 382 #endif 383 #ifdef CONFIG_SND_VERBOSE_PROCFS 384 struct snd_info_entry *proc_root; 385 struct snd_info_entry *proc_info_entry; 386 struct snd_info_entry *proc_hw_params_entry; 387 struct snd_info_entry *proc_sw_params_entry; 388 struct snd_info_entry *proc_status_entry; 389 struct snd_info_entry *proc_prealloc_entry; 390 struct snd_info_entry *proc_prealloc_max_entry; 391 #endif 392 /* misc flags */ 393 unsigned int hw_opened: 1; 394 }; 395 396 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 397 398 399 struct snd_pcm_str { 400 int stream; /* stream (direction) */ 401 struct snd_pcm *pcm; 402 /* -- substreams -- */ 403 unsigned int substream_count; 404 unsigned int substream_opened; 405 struct snd_pcm_substream *substream; 406 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 407 /* -- OSS things -- */ 408 struct snd_pcm_oss_stream oss; 409 #endif 410 #ifdef CONFIG_SND_VERBOSE_PROCFS 411 struct snd_info_entry *proc_root; 412 struct snd_info_entry *proc_info_entry; 413 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 414 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 415 struct snd_info_entry *proc_xrun_debug_entry; 416 #endif 417 #endif 418 }; 419 420 struct snd_pcm { 421 struct snd_card *card; 422 struct list_head list; 423 int device; /* device number */ 424 unsigned int info_flags; 425 unsigned short dev_class; 426 unsigned short dev_subclass; 427 char id[64]; 428 char name[80]; 429 struct snd_pcm_str streams[2]; 430 struct mutex open_mutex; 431 wait_queue_head_t open_wait; 432 void *private_data; 433 void (*private_free) (struct snd_pcm *pcm); 434 struct device *dev; /* actual hw device this belongs to */ 435 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 436 struct snd_pcm_oss oss; 437 #endif 438 }; 439 440 struct snd_pcm_notify { 441 int (*n_register) (struct snd_pcm * pcm); 442 int (*n_disconnect) (struct snd_pcm * pcm); 443 int (*n_unregister) (struct snd_pcm * pcm); 444 struct list_head list; 445 }; 446 447 /* 448 * Registering 449 */ 450 451 extern const struct file_operations snd_pcm_f_ops[2]; 452 453 int snd_pcm_new(struct snd_card *card, const char *id, int device, 454 int playback_count, int capture_count, 455 struct snd_pcm **rpcm); 456 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 457 458 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 459 460 /* 461 * Native I/O 462 */ 463 464 extern rwlock_t snd_pcm_link_rwlock; 465 466 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 467 int snd_pcm_info_user(struct snd_pcm_substream *substream, 468 struct snd_pcm_info __user *info); 469 int snd_pcm_status(struct snd_pcm_substream *substream, 470 struct snd_pcm_status *status); 471 int snd_pcm_start(struct snd_pcm_substream *substream); 472 int snd_pcm_stop(struct snd_pcm_substream *substream, int status); 473 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 474 #ifdef CONFIG_PM 475 int snd_pcm_suspend(struct snd_pcm_substream *substream); 476 int snd_pcm_suspend_all(struct snd_pcm *pcm); 477 #endif 478 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 479 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 480 struct snd_pcm_substream **rsubstream); 481 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 482 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 483 struct snd_pcm_substream **rsubstream); 484 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 485 void snd_pcm_vma_notify_data(void *client, void *data); 486 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 487 488 #if BITS_PER_LONG >= 64 489 490 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 491 { 492 *rem = *n % div; 493 *n /= div; 494 } 495 496 #elif defined(i386) 497 498 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 499 { 500 u_int32_t low, high; 501 low = *n & 0xffffffff; 502 high = *n >> 32; 503 if (high) { 504 u_int32_t high1 = high % div; 505 high /= div; 506 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1)); 507 *n = (u_int64_t)high << 32 | low; 508 } else { 509 *n = low / div; 510 *rem = low % div; 511 } 512 } 513 #else 514 515 static inline void divl(u_int32_t high, u_int32_t low, 516 u_int32_t div, 517 u_int32_t *q, u_int32_t *r) 518 { 519 u_int64_t n = (u_int64_t)high << 32 | low; 520 u_int64_t d = (u_int64_t)div << 31; 521 u_int32_t q1 = 0; 522 int c = 32; 523 while (n > 0xffffffffU) { 524 q1 <<= 1; 525 if (n >= d) { 526 n -= d; 527 q1 |= 1; 528 } 529 d >>= 1; 530 c--; 531 } 532 q1 <<= c; 533 if (n) { 534 low = n; 535 *q = q1 | (low / div); 536 *r = low % div; 537 } else { 538 *r = 0; 539 *q = q1; 540 } 541 return; 542 } 543 544 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem) 545 { 546 u_int32_t low, high; 547 low = *n & 0xffffffff; 548 high = *n >> 32; 549 if (high) { 550 u_int32_t high1 = high % div; 551 u_int32_t low1 = low; 552 high /= div; 553 divl(high1, low1, div, &low, rem); 554 *n = (u_int64_t)high << 32 | low; 555 } else { 556 *n = low / div; 557 *rem = low % div; 558 } 559 } 560 #endif 561 562 /* 563 * PCM library 564 */ 565 566 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 567 { 568 return substream->group != &substream->self_group; 569 } 570 571 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 572 { 573 read_lock(&snd_pcm_link_rwlock); 574 spin_lock(&substream->self_group.lock); 575 } 576 577 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 578 { 579 spin_unlock(&substream->self_group.lock); 580 read_unlock(&snd_pcm_link_rwlock); 581 } 582 583 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 584 { 585 read_lock_irq(&snd_pcm_link_rwlock); 586 spin_lock(&substream->self_group.lock); 587 } 588 589 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 590 { 591 spin_unlock(&substream->self_group.lock); 592 read_unlock_irq(&snd_pcm_link_rwlock); 593 } 594 595 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 596 do { \ 597 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 598 spin_lock(&substream->self_group.lock); \ 599 } while (0) 600 601 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 602 do { \ 603 spin_unlock(&substream->self_group.lock); \ 604 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 605 } while (0) 606 607 #define snd_pcm_group_for_each_entry(s, substream) \ 608 list_for_each_entry(s, &substream->group->substreams, link_list) 609 610 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 611 { 612 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 613 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 614 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 615 } 616 617 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 618 { 619 return size * 8 / runtime->sample_bits; 620 } 621 622 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 623 { 624 return size * 8 / runtime->frame_bits; 625 } 626 627 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 628 { 629 return size * runtime->sample_bits / 8; 630 } 631 632 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 633 { 634 return size * runtime->frame_bits / 8; 635 } 636 637 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 638 { 639 return bytes % runtime->byte_align == 0; 640 } 641 642 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 643 { 644 struct snd_pcm_runtime *runtime = substream->runtime; 645 return frames_to_bytes(runtime, runtime->buffer_size); 646 } 647 648 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 649 { 650 struct snd_pcm_runtime *runtime = substream->runtime; 651 return frames_to_bytes(runtime, runtime->period_size); 652 } 653 654 /* 655 * result is: 0 ... (boundary - 1) 656 */ 657 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 658 { 659 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 660 if (avail < 0) 661 avail += runtime->boundary; 662 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 663 avail -= runtime->boundary; 664 return avail; 665 } 666 667 /* 668 * result is: 0 ... (boundary - 1) 669 */ 670 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 671 { 672 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 673 if (avail < 0) 674 avail += runtime->boundary; 675 return avail; 676 } 677 678 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 679 { 680 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 681 } 682 683 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 684 { 685 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 686 } 687 688 /** 689 * snd_pcm_playback_ready - check whether the playback buffer is available 690 * @substream: the pcm substream instance 691 * 692 * Checks whether enough free space is available on the playback buffer. 693 * 694 * Returns non-zero if available, or zero if not. 695 */ 696 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 697 { 698 struct snd_pcm_runtime *runtime = substream->runtime; 699 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 700 } 701 702 /** 703 * snd_pcm_capture_ready - check whether the capture buffer is available 704 * @substream: the pcm substream instance 705 * 706 * Checks whether enough capture data is available on the capture buffer. 707 * 708 * Returns non-zero if available, or zero if not. 709 */ 710 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 711 { 712 struct snd_pcm_runtime *runtime = substream->runtime; 713 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 714 } 715 716 /** 717 * snd_pcm_playback_data - check whether any data exists on the playback buffer 718 * @substream: the pcm substream instance 719 * 720 * Checks whether any data exists on the playback buffer. If stop_threshold 721 * is bigger or equal to boundary, then this function returns always non-zero. 722 * 723 * Returns non-zero if exists, or zero if not. 724 */ 725 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 726 { 727 struct snd_pcm_runtime *runtime = substream->runtime; 728 729 if (runtime->stop_threshold >= runtime->boundary) 730 return 1; 731 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 732 } 733 734 /** 735 * snd_pcm_playback_empty - check whether the playback buffer is empty 736 * @substream: the pcm substream instance 737 * 738 * Checks whether the playback buffer is empty. 739 * 740 * Returns non-zero if empty, or zero if not. 741 */ 742 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 743 { 744 struct snd_pcm_runtime *runtime = substream->runtime; 745 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 746 } 747 748 /** 749 * snd_pcm_capture_empty - check whether the capture buffer is empty 750 * @substream: the pcm substream instance 751 * 752 * Checks whether the capture buffer is empty. 753 * 754 * Returns non-zero if empty, or zero if not. 755 */ 756 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 757 { 758 struct snd_pcm_runtime *runtime = substream->runtime; 759 return snd_pcm_capture_avail(runtime) == 0; 760 } 761 762 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 763 struct snd_pcm_substream *master) 764 { 765 substream->runtime->trigger_master = master; 766 } 767 768 static inline int hw_is_mask(int var) 769 { 770 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 771 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 772 } 773 774 static inline int hw_is_interval(int var) 775 { 776 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 777 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 778 } 779 780 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 781 snd_pcm_hw_param_t var) 782 { 783 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 784 } 785 786 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 787 snd_pcm_hw_param_t var) 788 { 789 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 790 } 791 792 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 793 snd_pcm_hw_param_t var) 794 { 795 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 796 } 797 798 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 799 snd_pcm_hw_param_t var) 800 { 801 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 802 } 803 804 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS)) 805 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT)) 806 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 807 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 808 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 809 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 810 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 811 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 812 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 813 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->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_period_elapsed(struct snd_pcm_substream *substream); 912 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 913 const void __user *buf, 914 snd_pcm_uframes_t frames); 915 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 916 void __user *buf, snd_pcm_uframes_t frames); 917 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 918 void __user **bufs, snd_pcm_uframes_t frames); 919 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 920 void __user **bufs, snd_pcm_uframes_t frames); 921 922 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 923 924 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 925 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 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 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 953 struct timespec *tv) 954 { 955 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 956 do_posix_clock_monotonic_gettime(tv); 957 else 958 getnstimeofday(tv); 959 } 960 961 /* 962 * Memory 963 */ 964 965 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 966 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 967 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 968 int type, struct device *data, 969 size_t size, size_t max); 970 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 971 int type, void *data, 972 size_t size, size_t max); 973 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 974 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 975 976 /* 977 * SG-buffer handling 978 */ 979 #define snd_pcm_substream_sgbuf(substream) \ 980 ((substream)->runtime->dma_buffer_p->private_data) 981 982 static inline dma_addr_t 983 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 984 { 985 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 986 return snd_sgbuf_get_addr(sg, ofs); 987 } 988 989 static inline void * 990 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 991 { 992 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 993 return snd_sgbuf_get_ptr(sg, ofs); 994 } 995 996 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 997 unsigned long offset); 998 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 999 unsigned int ofs, unsigned int size); 1000 1001 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1002 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1003 { 1004 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1005 atomic_inc(&substream->mmap_count); 1006 } 1007 1008 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1009 { 1010 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1011 atomic_dec(&substream->mmap_count); 1012 } 1013 1014 /* mmap for io-memory area */ 1015 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1016 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1017 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1018 #else 1019 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1020 #define snd_pcm_lib_mmap_iomem NULL 1021 #endif 1022 1023 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1024 { 1025 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1026 } 1027 1028 /* 1029 * Misc 1030 */ 1031 1032 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1033 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1034 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1035 (IEC958_AES3_CON_FS_48000<<24)) 1036 1037 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1038 1039 #endif /* __SOUND_PCM_H */ 1040