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 #include <linux/pm_qos_params.h> 33 34 #define snd_pcm_substream_chip(substream) ((substream)->private_data) 35 #define snd_pcm_chip(pcm) ((pcm)->private_data) 36 37 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 38 #include "pcm_oss.h" 39 #endif 40 41 /* 42 * Hardware (lowlevel) section 43 */ 44 45 struct snd_pcm_hardware { 46 unsigned int info; /* SNDRV_PCM_INFO_* */ 47 u64 formats; /* SNDRV_PCM_FMTBIT_* */ 48 unsigned int rates; /* SNDRV_PCM_RATE_* */ 49 unsigned int rate_min; /* min rate */ 50 unsigned int rate_max; /* max rate */ 51 unsigned int channels_min; /* min channels */ 52 unsigned int channels_max; /* max channels */ 53 size_t buffer_bytes_max; /* max buffer size */ 54 size_t period_bytes_min; /* min period size */ 55 size_t period_bytes_max; /* max period size */ 56 unsigned int periods_min; /* min # of periods */ 57 unsigned int periods_max; /* max # of periods */ 58 size_t fifo_size; /* fifo size in bytes */ 59 }; 60 61 struct snd_pcm_substream; 62 63 struct snd_pcm_ops { 64 int (*open)(struct snd_pcm_substream *substream); 65 int (*close)(struct snd_pcm_substream *substream); 66 int (*ioctl)(struct snd_pcm_substream * substream, 67 unsigned int cmd, void *arg); 68 int (*hw_params)(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params *params); 70 int (*hw_free)(struct snd_pcm_substream *substream); 71 int (*prepare)(struct snd_pcm_substream *substream); 72 int (*trigger)(struct snd_pcm_substream *substream, int cmd); 73 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); 74 int (*copy)(struct snd_pcm_substream *substream, int channel, 75 snd_pcm_uframes_t pos, 76 void __user *buf, snd_pcm_uframes_t count); 77 int (*silence)(struct snd_pcm_substream *substream, int channel, 78 snd_pcm_uframes_t pos, snd_pcm_uframes_t count); 79 struct page *(*page)(struct snd_pcm_substream *substream, 80 unsigned long offset); 81 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); 82 int (*ack)(struct snd_pcm_substream *substream); 83 }; 84 85 /* 86 * 87 */ 88 89 #if defined(CONFIG_SND_DYNAMIC_MINORS) 90 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2) 91 #else 92 #define SNDRV_PCM_DEVICES 8 93 #endif 94 95 #define SNDRV_PCM_IOCTL1_FALSE ((void *)0) 96 #define SNDRV_PCM_IOCTL1_TRUE ((void *)1) 97 98 #define SNDRV_PCM_IOCTL1_RESET 0 99 #define SNDRV_PCM_IOCTL1_INFO 1 100 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 101 #define SNDRV_PCM_IOCTL1_GSTATE 3 102 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4 103 104 #define SNDRV_PCM_TRIGGER_STOP 0 105 #define SNDRV_PCM_TRIGGER_START 1 106 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 107 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 108 #define SNDRV_PCM_TRIGGER_SUSPEND 5 109 #define SNDRV_PCM_TRIGGER_RESUME 6 110 111 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) 112 113 /* If you change this don't forget to change rates[] table in pcm_native.c */ 114 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */ 115 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */ 116 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */ 117 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */ 118 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */ 119 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */ 120 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */ 121 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */ 122 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */ 123 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */ 124 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */ 125 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */ 126 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */ 127 128 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */ 129 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */ 130 131 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ 132 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ 133 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) 134 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) 135 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ 136 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) 137 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ 138 SNDRV_PCM_RATE_192000) 139 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt) 140 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8) 141 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8) 142 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE) 143 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE) 144 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE) 145 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE) 146 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE) 147 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE) 148 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE) 149 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE) 150 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE) 151 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE) 152 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE) 153 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE) 154 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE) 155 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE) 156 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE) 157 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE) 158 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE) 159 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE) 160 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW) 161 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW) 162 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM) 163 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG) 164 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM) 165 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL) 166 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE) 167 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE) 168 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE) 169 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE) 170 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE) 171 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE) 172 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE) 173 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE) 174 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE) 175 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE) 176 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE) 177 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE) 178 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24) 179 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B) 180 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40) 181 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B) 182 183 #ifdef SNDRV_LITTLE_ENDIAN 184 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 185 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 186 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 187 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 188 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 189 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 190 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 191 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 192 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 193 #endif 194 #ifdef SNDRV_BIG_ENDIAN 195 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 196 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 197 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 198 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 199 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 200 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 201 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 202 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 203 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 204 #endif 205 206 struct snd_pcm_file { 207 struct snd_pcm_substream *substream; 208 int no_compat_mmap; 209 }; 210 211 struct snd_pcm_hw_rule; 212 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 213 struct snd_pcm_hw_rule *rule); 214 215 struct snd_pcm_hw_rule { 216 unsigned int cond; 217 snd_pcm_hw_rule_func_t func; 218 int var; 219 int deps[4]; 220 void *private; 221 }; 222 223 struct snd_pcm_hw_constraints { 224 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 225 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 226 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 227 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 228 unsigned int rules_num; 229 unsigned int rules_all; 230 struct snd_pcm_hw_rule *rules; 231 }; 232 233 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 234 snd_pcm_hw_param_t var) 235 { 236 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 237 } 238 239 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 240 snd_pcm_hw_param_t var) 241 { 242 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 243 } 244 245 struct snd_ratnum { 246 unsigned int num; 247 unsigned int den_min, den_max, den_step; 248 }; 249 250 struct snd_ratden { 251 unsigned int num_min, num_max, num_step; 252 unsigned int den; 253 }; 254 255 struct snd_pcm_hw_constraint_ratnums { 256 int nrats; 257 struct snd_ratnum *rats; 258 }; 259 260 struct snd_pcm_hw_constraint_ratdens { 261 int nrats; 262 struct snd_ratden *rats; 263 }; 264 265 struct snd_pcm_hw_constraint_list { 266 unsigned int count; 267 unsigned int *list; 268 unsigned int mask; 269 }; 270 271 struct snd_pcm_hwptr_log; 272 273 struct snd_pcm_runtime { 274 /* -- Status -- */ 275 struct snd_pcm_substream *trigger_master; 276 struct timespec trigger_tstamp; /* trigger timestamp */ 277 int overrange; 278 snd_pcm_uframes_t avail_max; 279 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 280 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ 281 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ 282 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */ 283 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */ 284 285 /* -- HW params -- */ 286 snd_pcm_access_t access; /* access mode */ 287 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 288 snd_pcm_subformat_t subformat; /* subformat */ 289 unsigned int rate; /* rate in Hz */ 290 unsigned int channels; /* channels */ 291 snd_pcm_uframes_t period_size; /* period size */ 292 unsigned int periods; /* periods */ 293 snd_pcm_uframes_t buffer_size; /* buffer size */ 294 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 295 size_t byte_align; 296 unsigned int frame_bits; 297 unsigned int sample_bits; 298 unsigned int info; 299 unsigned int rate_num; 300 unsigned int rate_den; 301 unsigned int no_period_wakeup: 1; 302 303 /* -- SW params -- */ 304 int tstamp_mode; /* mmap timestamp is updated */ 305 unsigned int period_step; 306 snd_pcm_uframes_t start_threshold; 307 snd_pcm_uframes_t stop_threshold; 308 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 309 noise is nearest than this */ 310 snd_pcm_uframes_t silence_size; /* Silence filling size */ 311 snd_pcm_uframes_t boundary; /* pointers wrap point */ 312 313 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 314 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 315 316 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 317 318 /* -- mmap -- */ 319 struct snd_pcm_mmap_status *status; 320 struct snd_pcm_mmap_control *control; 321 322 /* -- locking / scheduling -- */ 323 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ 324 wait_queue_head_t sleep; /* poll sleep */ 325 wait_queue_head_t tsleep; /* transfer sleep */ 326 struct fasync_struct *fasync; 327 328 /* -- private section -- */ 329 void *private_data; 330 void (*private_free)(struct snd_pcm_runtime *runtime); 331 332 /* -- hardware description -- */ 333 struct snd_pcm_hardware hw; 334 struct snd_pcm_hw_constraints hw_constraints; 335 336 /* -- interrupt callbacks -- */ 337 void (*transfer_ack_begin)(struct snd_pcm_substream *substream); 338 void (*transfer_ack_end)(struct snd_pcm_substream *substream); 339 340 /* -- timer -- */ 341 unsigned int timer_resolution; /* timer resolution */ 342 int tstamp_type; /* timestamp type */ 343 344 /* -- DMA -- */ 345 unsigned char *dma_area; /* DMA area */ 346 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 347 size_t dma_bytes; /* size of DMA area */ 348 349 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 350 351 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 352 /* -- OSS things -- */ 353 struct snd_pcm_oss_runtime oss; 354 #endif 355 356 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 357 struct snd_pcm_hwptr_log *hwptr_log; 358 #endif 359 }; 360 361 struct snd_pcm_group { /* keep linked substreams */ 362 spinlock_t lock; 363 struct list_head substreams; 364 int count; 365 }; 366 367 struct pid; 368 369 struct snd_pcm_substream { 370 struct snd_pcm *pcm; 371 struct snd_pcm_str *pstr; 372 void *private_data; /* copied from pcm->private_data */ 373 int number; 374 char name[32]; /* substream name */ 375 int stream; /* stream (direction) */ 376 struct pm_qos_request_list latency_pm_qos_req; /* pm_qos request */ 377 size_t buffer_bytes_max; /* limit ring buffer size */ 378 struct snd_dma_buffer dma_buffer; 379 unsigned int dma_buf_id; 380 size_t dma_max; 381 /* -- hardware operations -- */ 382 struct snd_pcm_ops *ops; 383 /* -- runtime information -- */ 384 struct snd_pcm_runtime *runtime; 385 /* -- timer section -- */ 386 struct snd_timer *timer; /* timer */ 387 unsigned timer_running: 1; /* time is running */ 388 /* -- next substream -- */ 389 struct snd_pcm_substream *next; 390 /* -- linked substreams -- */ 391 struct list_head link_list; /* linked list member */ 392 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 393 struct snd_pcm_group *group; /* pointer to current group */ 394 /* -- assigned files -- */ 395 void *file; 396 int ref_count; 397 atomic_t mmap_count; 398 unsigned int f_flags; 399 void (*pcm_release)(struct snd_pcm_substream *); 400 struct pid *pid; 401 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 402 /* -- OSS things -- */ 403 struct snd_pcm_oss_substream oss; 404 #endif 405 #ifdef CONFIG_SND_VERBOSE_PROCFS 406 struct snd_info_entry *proc_root; 407 struct snd_info_entry *proc_info_entry; 408 struct snd_info_entry *proc_hw_params_entry; 409 struct snd_info_entry *proc_sw_params_entry; 410 struct snd_info_entry *proc_status_entry; 411 struct snd_info_entry *proc_prealloc_entry; 412 struct snd_info_entry *proc_prealloc_max_entry; 413 #endif 414 /* misc flags */ 415 unsigned int hw_opened: 1; 416 }; 417 418 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 419 420 421 struct snd_pcm_str { 422 int stream; /* stream (direction) */ 423 struct snd_pcm *pcm; 424 /* -- substreams -- */ 425 unsigned int substream_count; 426 unsigned int substream_opened; 427 struct snd_pcm_substream *substream; 428 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 429 /* -- OSS things -- */ 430 struct snd_pcm_oss_stream oss; 431 #endif 432 #ifdef CONFIG_SND_VERBOSE_PROCFS 433 struct snd_info_entry *proc_root; 434 struct snd_info_entry *proc_info_entry; 435 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 436 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 437 struct snd_info_entry *proc_xrun_debug_entry; 438 #endif 439 #endif 440 }; 441 442 struct snd_pcm { 443 struct snd_card *card; 444 struct list_head list; 445 int device; /* device number */ 446 unsigned int info_flags; 447 unsigned short dev_class; 448 unsigned short dev_subclass; 449 char id[64]; 450 char name[80]; 451 struct snd_pcm_str streams[2]; 452 struct mutex open_mutex; 453 wait_queue_head_t open_wait; 454 void *private_data; 455 void (*private_free) (struct snd_pcm *pcm); 456 struct device *dev; /* actual hw device this belongs to */ 457 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 458 struct snd_pcm_oss oss; 459 #endif 460 }; 461 462 struct snd_pcm_notify { 463 int (*n_register) (struct snd_pcm * pcm); 464 int (*n_disconnect) (struct snd_pcm * pcm); 465 int (*n_unregister) (struct snd_pcm * pcm); 466 struct list_head list; 467 }; 468 469 /* 470 * Registering 471 */ 472 473 extern const struct file_operations snd_pcm_f_ops[2]; 474 475 int snd_pcm_new(struct snd_card *card, const char *id, int device, 476 int playback_count, int capture_count, 477 struct snd_pcm **rpcm); 478 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 479 480 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 481 482 /* 483 * Native I/O 484 */ 485 486 extern rwlock_t snd_pcm_link_rwlock; 487 488 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 489 int snd_pcm_info_user(struct snd_pcm_substream *substream, 490 struct snd_pcm_info __user *info); 491 int snd_pcm_status(struct snd_pcm_substream *substream, 492 struct snd_pcm_status *status); 493 int snd_pcm_start(struct snd_pcm_substream *substream); 494 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 495 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 496 #ifdef CONFIG_PM 497 int snd_pcm_suspend(struct snd_pcm_substream *substream); 498 int snd_pcm_suspend_all(struct snd_pcm *pcm); 499 #endif 500 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 501 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 502 struct snd_pcm_substream **rsubstream); 503 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 504 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 505 struct snd_pcm_substream **rsubstream); 506 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 507 void snd_pcm_vma_notify_data(void *client, void *data); 508 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 509 510 /* 511 * PCM library 512 */ 513 514 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 515 { 516 return substream->group != &substream->self_group; 517 } 518 519 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream) 520 { 521 read_lock(&snd_pcm_link_rwlock); 522 spin_lock(&substream->self_group.lock); 523 } 524 525 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) 526 { 527 spin_unlock(&substream->self_group.lock); 528 read_unlock(&snd_pcm_link_rwlock); 529 } 530 531 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) 532 { 533 read_lock_irq(&snd_pcm_link_rwlock); 534 spin_lock(&substream->self_group.lock); 535 } 536 537 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) 538 { 539 spin_unlock(&substream->self_group.lock); 540 read_unlock_irq(&snd_pcm_link_rwlock); 541 } 542 543 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 544 do { \ 545 read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \ 546 spin_lock(&substream->self_group.lock); \ 547 } while (0) 548 549 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \ 550 do { \ 551 spin_unlock(&substream->self_group.lock); \ 552 read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \ 553 } while (0) 554 555 #define snd_pcm_group_for_each_entry(s, substream) \ 556 list_for_each_entry(s, &substream->group->substreams, link_list) 557 558 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 559 { 560 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 561 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 562 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 563 } 564 565 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 566 { 567 return size * 8 / runtime->sample_bits; 568 } 569 570 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 571 { 572 return size * 8 / runtime->frame_bits; 573 } 574 575 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 576 { 577 return size * runtime->sample_bits / 8; 578 } 579 580 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 581 { 582 return size * runtime->frame_bits / 8; 583 } 584 585 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 586 { 587 return bytes % runtime->byte_align == 0; 588 } 589 590 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 591 { 592 struct snd_pcm_runtime *runtime = substream->runtime; 593 return frames_to_bytes(runtime, runtime->buffer_size); 594 } 595 596 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 597 { 598 struct snd_pcm_runtime *runtime = substream->runtime; 599 return frames_to_bytes(runtime, runtime->period_size); 600 } 601 602 /* 603 * result is: 0 ... (boundary - 1) 604 */ 605 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 606 { 607 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 608 if (avail < 0) 609 avail += runtime->boundary; 610 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 611 avail -= runtime->boundary; 612 return avail; 613 } 614 615 /* 616 * result is: 0 ... (boundary - 1) 617 */ 618 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 619 { 620 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 621 if (avail < 0) 622 avail += runtime->boundary; 623 return avail; 624 } 625 626 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 627 { 628 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 629 } 630 631 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 632 { 633 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 634 } 635 636 /** 637 * snd_pcm_playback_ready - check whether the playback buffer is available 638 * @substream: the pcm substream instance 639 * 640 * Checks whether enough free space is available on the playback buffer. 641 * 642 * Returns non-zero if available, or zero if not. 643 */ 644 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 645 { 646 struct snd_pcm_runtime *runtime = substream->runtime; 647 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 648 } 649 650 /** 651 * snd_pcm_capture_ready - check whether the capture buffer is available 652 * @substream: the pcm substream instance 653 * 654 * Checks whether enough capture data is available on the capture buffer. 655 * 656 * Returns non-zero if available, or zero if not. 657 */ 658 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 659 { 660 struct snd_pcm_runtime *runtime = substream->runtime; 661 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 662 } 663 664 /** 665 * snd_pcm_playback_data - check whether any data exists on the playback buffer 666 * @substream: the pcm substream instance 667 * 668 * Checks whether any data exists on the playback buffer. If stop_threshold 669 * is bigger or equal to boundary, then this function returns always non-zero. 670 * 671 * Returns non-zero if exists, or zero if not. 672 */ 673 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 674 { 675 struct snd_pcm_runtime *runtime = substream->runtime; 676 677 if (runtime->stop_threshold >= runtime->boundary) 678 return 1; 679 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 680 } 681 682 /** 683 * snd_pcm_playback_empty - check whether the playback buffer is empty 684 * @substream: the pcm substream instance 685 * 686 * Checks whether the playback buffer is empty. 687 * 688 * Returns non-zero if empty, or zero if not. 689 */ 690 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 691 { 692 struct snd_pcm_runtime *runtime = substream->runtime; 693 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 694 } 695 696 /** 697 * snd_pcm_capture_empty - check whether the capture buffer is empty 698 * @substream: the pcm substream instance 699 * 700 * Checks whether the capture buffer is empty. 701 * 702 * Returns non-zero if empty, or zero if not. 703 */ 704 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 705 { 706 struct snd_pcm_runtime *runtime = substream->runtime; 707 return snd_pcm_capture_avail(runtime) == 0; 708 } 709 710 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 711 struct snd_pcm_substream *master) 712 { 713 substream->runtime->trigger_master = master; 714 } 715 716 static inline int hw_is_mask(int var) 717 { 718 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 719 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 720 } 721 722 static inline int hw_is_interval(int var) 723 { 724 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 725 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 726 } 727 728 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 729 snd_pcm_hw_param_t var) 730 { 731 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 732 } 733 734 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 735 snd_pcm_hw_param_t var) 736 { 737 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 738 } 739 740 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 741 snd_pcm_hw_param_t var) 742 { 743 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 744 } 745 746 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 747 snd_pcm_hw_param_t var) 748 { 749 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 750 } 751 752 #define params_access(p) ((__force snd_pcm_access_t)snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))) 753 #define params_format(p) ((__force snd_pcm_format_t)snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))) 754 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) 755 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min 756 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min 757 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min 758 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8) 759 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min 760 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min 761 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min 762 763 764 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 765 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 766 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c); 767 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 768 unsigned int k, struct snd_interval *c); 769 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 770 const struct snd_interval *b, struct snd_interval *c); 771 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask); 772 int snd_interval_ratnum(struct snd_interval *i, 773 unsigned int rats_count, struct snd_ratnum *rats, 774 unsigned int *nump, unsigned int *denp); 775 776 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 777 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 778 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 779 780 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 781 782 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream); 783 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream); 784 785 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 786 u_int32_t mask); 787 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 788 u_int64_t mask); 789 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 790 unsigned int min, unsigned int max); 791 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 792 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 793 unsigned int cond, 794 snd_pcm_hw_param_t var, 795 struct snd_pcm_hw_constraint_list *l); 796 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 797 unsigned int cond, 798 snd_pcm_hw_param_t var, 799 struct snd_pcm_hw_constraint_ratnums *r); 800 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 801 unsigned int cond, 802 snd_pcm_hw_param_t var, 803 struct snd_pcm_hw_constraint_ratdens *r); 804 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 805 unsigned int cond, 806 unsigned int width, 807 unsigned int msbits); 808 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 809 unsigned int cond, 810 snd_pcm_hw_param_t var, 811 unsigned long step); 812 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 813 unsigned int cond, 814 snd_pcm_hw_param_t var); 815 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 816 unsigned int cond, 817 int var, 818 snd_pcm_hw_rule_func_t func, void *private, 819 int dep, ...); 820 821 int snd_pcm_format_signed(snd_pcm_format_t format); 822 int snd_pcm_format_unsigned(snd_pcm_format_t format); 823 int snd_pcm_format_linear(snd_pcm_format_t format); 824 int snd_pcm_format_little_endian(snd_pcm_format_t format); 825 int snd_pcm_format_big_endian(snd_pcm_format_t format); 826 #if 0 /* just for DocBook */ 827 /** 828 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 829 * @format: the format to check 830 * 831 * Returns 1 if the given PCM format is CPU-endian, 0 if 832 * opposite, or a negative error code if endian not specified. 833 */ 834 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 835 #endif /* DocBook */ 836 #ifdef SNDRV_LITTLE_ENDIAN 837 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 838 #else 839 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 840 #endif 841 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 842 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 843 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 844 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 845 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 846 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian); 847 848 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops); 849 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 850 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream); 851 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 852 unsigned int cmd, void *arg); 853 int snd_pcm_update_state(struct snd_pcm_substream *substream, 854 struct snd_pcm_runtime *runtime); 855 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); 856 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream); 857 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream); 858 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream); 859 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream); 860 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr); 861 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 862 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, 863 const void __user *buf, 864 snd_pcm_uframes_t frames); 865 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, 866 void __user *buf, snd_pcm_uframes_t frames); 867 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 868 void __user **bufs, snd_pcm_uframes_t frames); 869 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 870 void __user **bufs, snd_pcm_uframes_t frames); 871 872 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates; 873 874 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime); 875 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 876 877 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 878 struct snd_dma_buffer *bufp) 879 { 880 struct snd_pcm_runtime *runtime = substream->runtime; 881 if (bufp) { 882 runtime->dma_buffer_p = bufp; 883 runtime->dma_area = bufp->area; 884 runtime->dma_addr = bufp->addr; 885 runtime->dma_bytes = bufp->bytes; 886 } else { 887 runtime->dma_buffer_p = NULL; 888 runtime->dma_area = NULL; 889 runtime->dma_addr = 0; 890 runtime->dma_bytes = 0; 891 } 892 } 893 894 /* 895 * Timer interface 896 */ 897 898 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); 899 void snd_pcm_timer_init(struct snd_pcm_substream *substream); 900 void snd_pcm_timer_done(struct snd_pcm_substream *substream); 901 902 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 903 struct timespec *tv) 904 { 905 if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 906 do_posix_clock_monotonic_gettime(tv); 907 else 908 getnstimeofday(tv); 909 } 910 911 /* 912 * Memory 913 */ 914 915 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 916 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 917 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 918 int type, struct device *data, 919 size_t size, size_t max); 920 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 921 int type, void *data, 922 size_t size, size_t max); 923 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 924 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 925 926 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 927 size_t size, gfp_t gfp_flags); 928 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 929 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 930 unsigned long offset); 931 #if 0 /* for kernel-doc */ 932 /** 933 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 934 * @substream: the substream to allocate the buffer to 935 * @size: the requested buffer size, in bytes 936 * 937 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 938 * contiguous in kernel virtual space, but not in physical memory. Use this 939 * if the buffer is accessed by kernel code but not by device DMA. 940 * 941 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error 942 * code. 943 */ 944 static int snd_pcm_lib_alloc_vmalloc_buffer 945 (struct snd_pcm_substream *substream, size_t size); 946 /** 947 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 948 * @substream: the substream to allocate the buffer to 949 * @size: the requested buffer size, in bytes 950 * 951 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 952 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 953 */ 954 static int snd_pcm_lib_alloc_vmalloc_32_buffer 955 (struct snd_pcm_substream *substream, size_t size); 956 #endif 957 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \ 958 _snd_pcm_lib_alloc_vmalloc_buffer \ 959 (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO) 960 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \ 961 _snd_pcm_lib_alloc_vmalloc_buffer \ 962 (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO) 963 964 #ifdef CONFIG_SND_DMA_SGBUF 965 /* 966 * SG-buffer handling 967 */ 968 #define snd_pcm_substream_sgbuf(substream) \ 969 ((substream)->runtime->dma_buffer_p->private_data) 970 971 static inline dma_addr_t 972 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 973 { 974 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 975 return snd_sgbuf_get_addr(sg, ofs); 976 } 977 978 static inline void * 979 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 980 { 981 struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); 982 return snd_sgbuf_get_ptr(sg, ofs); 983 } 984 985 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, 986 unsigned long offset); 987 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 988 unsigned int ofs, unsigned int size); 989 990 #else /* !SND_DMA_SGBUF */ 991 /* 992 * fake using a continuous buffer 993 */ 994 static inline dma_addr_t 995 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 996 { 997 return substream->runtime->dma_addr + ofs; 998 } 999 1000 static inline void * 1001 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) 1002 { 1003 return substream->runtime->dma_area + ofs; 1004 } 1005 1006 #define snd_pcm_sgbuf_ops_page NULL 1007 1008 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size) 1009 1010 #endif /* SND_DMA_SGBUF */ 1011 1012 /* handle mmap counter - PCM mmap callback should handle this counter properly */ 1013 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1014 { 1015 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1016 atomic_inc(&substream->mmap_count); 1017 } 1018 1019 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1020 { 1021 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1022 atomic_dec(&substream->mmap_count); 1023 } 1024 1025 /* mmap for io-memory area */ 1026 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1027 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1028 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1029 #else 1030 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1031 #define snd_pcm_lib_mmap_iomem NULL 1032 #endif 1033 1034 #define snd_pcm_lib_mmap_vmalloc NULL 1035 1036 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1037 { 1038 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1039 } 1040 1041 /* 1042 * Misc 1043 */ 1044 1045 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1046 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1047 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1048 (IEC958_AES3_CON_FS_48000<<24)) 1049 1050 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime) 1051 1052 const char *snd_pcm_format_name(snd_pcm_format_t format); 1053 1054 #endif /* __SOUND_PCM_H */ 1055