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TOMOYO Linux Cross Reference
Linux/include/sound/pcm.h

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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.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 <sound/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 (*wall_clock)(struct snd_pcm_substream *substream,
 75                           struct timespec *audio_ts);
 76         int (*copy)(struct snd_pcm_substream *substream, int channel,
 77                     snd_pcm_uframes_t pos,
 78                     void __user *buf, snd_pcm_uframes_t count);
 79         int (*silence)(struct snd_pcm_substream *substream, int channel, 
 80                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
 81         struct page *(*page)(struct snd_pcm_substream *substream,
 82                              unsigned long offset);
 83         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
 84         int (*ack)(struct snd_pcm_substream *substream);
 85 };
 86 
 87 /*
 88  *
 89  */
 90 
 91 #if defined(CONFIG_SND_DYNAMIC_MINORS)
 92 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
 93 #else
 94 #define SNDRV_PCM_DEVICES       8
 95 #endif
 96 
 97 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
 98 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
 99 
100 #define SNDRV_PCM_IOCTL1_RESET          0
101 #define SNDRV_PCM_IOCTL1_INFO           1
102 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
103 #define SNDRV_PCM_IOCTL1_GSTATE         3
104 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
105 
106 #define SNDRV_PCM_TRIGGER_STOP          0
107 #define SNDRV_PCM_TRIGGER_START         1
108 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
109 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
110 #define SNDRV_PCM_TRIGGER_SUSPEND       5
111 #define SNDRV_PCM_TRIGGER_RESUME        6
112 
113 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
114 
115 /* If you change this don't forget to change rates[] table in pcm_native.c */
116 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
117 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
118 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
119 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
120 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
121 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
122 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
123 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
124 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
125 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
126 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
127 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
128 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
129 
130 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
131 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
132 
133 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
134                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
135                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
136 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
137 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
138                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
139 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
140                                          SNDRV_PCM_RATE_192000)
141 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
142 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
143 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
144 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
145 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
146 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
147 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
148 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
149 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
150 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
151 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
152 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
153 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
154 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
155 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
156 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
157 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
158 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
159 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
160 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
162 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
163 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
164 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
165 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
166 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
167 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
168 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
169 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
170 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
171 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
172 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
173 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
174 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
175 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
176 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
177 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
178 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
179 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
180 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
181 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
182 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
183 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
184 
185 #ifdef SNDRV_LITTLE_ENDIAN
186 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
187 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
188 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
189 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
190 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
191 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
192 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
193 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
194 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
195 #endif
196 #ifdef SNDRV_BIG_ENDIAN
197 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
198 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
199 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
200 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
201 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
202 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
203 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
204 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
205 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
206 #endif
207 
208 struct snd_pcm_file {
209         struct snd_pcm_substream *substream;
210         int no_compat_mmap;
211 };
212 
213 struct snd_pcm_hw_rule;
214 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
215                                       struct snd_pcm_hw_rule *rule);
216 
217 struct snd_pcm_hw_rule {
218         unsigned int cond;
219         snd_pcm_hw_rule_func_t func;
220         int var;
221         int deps[4];
222         void *private;
223 };
224 
225 struct snd_pcm_hw_constraints {
226         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
227                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
228         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
229                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
230         unsigned int rules_num;
231         unsigned int rules_all;
232         struct snd_pcm_hw_rule *rules;
233 };
234 
235 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
236                                             snd_pcm_hw_param_t var)
237 {
238         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
239 }
240 
241 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
242                                                     snd_pcm_hw_param_t var)
243 {
244         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
245 }
246 
247 struct snd_ratnum {
248         unsigned int num;
249         unsigned int den_min, den_max, den_step;
250 };
251 
252 struct snd_ratden {
253         unsigned int num_min, num_max, num_step;
254         unsigned int den;
255 };
256 
257 struct snd_pcm_hw_constraint_ratnums {
258         int nrats;
259         struct snd_ratnum *rats;
260 };
261 
262 struct snd_pcm_hw_constraint_ratdens {
263         int nrats;
264         struct snd_ratden *rats;
265 };
266 
267 struct snd_pcm_hw_constraint_list {
268         unsigned int count;
269         const unsigned int *list;
270         unsigned int mask;
271 };
272 
273 struct snd_pcm_hwptr_log;
274 
275 struct snd_pcm_runtime {
276         /* -- Status -- */
277         struct snd_pcm_substream *trigger_master;
278         struct timespec trigger_tstamp; /* trigger timestamp */
279         int overrange;
280         snd_pcm_uframes_t avail_max;
281         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
282         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
283         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
284         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
285         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
286         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
287 
288         /* -- HW params -- */
289         snd_pcm_access_t access;        /* access mode */
290         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
291         snd_pcm_subformat_t subformat;  /* subformat */
292         unsigned int rate;              /* rate in Hz */
293         unsigned int channels;          /* channels */
294         snd_pcm_uframes_t period_size;  /* period size */
295         unsigned int periods;           /* periods */
296         snd_pcm_uframes_t buffer_size;  /* buffer size */
297         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
298         size_t byte_align;
299         unsigned int frame_bits;
300         unsigned int sample_bits;
301         unsigned int info;
302         unsigned int rate_num;
303         unsigned int rate_den;
304         unsigned int no_period_wakeup: 1;
305 
306         /* -- SW params -- */
307         int tstamp_mode;                /* mmap timestamp is updated */
308         unsigned int period_step;
309         snd_pcm_uframes_t start_threshold;
310         snd_pcm_uframes_t stop_threshold;
311         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
312                                                 noise is nearest than this */
313         snd_pcm_uframes_t silence_size; /* Silence filling size */
314         snd_pcm_uframes_t boundary;     /* pointers wrap point */
315 
316         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
317         snd_pcm_uframes_t silence_filled; /* size filled with silence */
318 
319         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
320 
321         /* -- mmap -- */
322         struct snd_pcm_mmap_status *status;
323         struct snd_pcm_mmap_control *control;
324 
325         /* -- locking / scheduling -- */
326         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
327         wait_queue_head_t sleep;        /* poll sleep */
328         wait_queue_head_t tsleep;       /* transfer sleep */
329         struct fasync_struct *fasync;
330 
331         /* -- private section -- */
332         void *private_data;
333         void (*private_free)(struct snd_pcm_runtime *runtime);
334 
335         /* -- hardware description -- */
336         struct snd_pcm_hardware hw;
337         struct snd_pcm_hw_constraints hw_constraints;
338 
339         /* -- interrupt callbacks -- */
340         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
341         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
342 
343         /* -- timer -- */
344         unsigned int timer_resolution;  /* timer resolution */
345         int tstamp_type;                /* timestamp type */
346 
347         /* -- DMA -- */           
348         unsigned char *dma_area;        /* DMA area */
349         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
350         size_t dma_bytes;               /* size of DMA area */
351 
352         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
353 
354 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
355         /* -- OSS things -- */
356         struct snd_pcm_oss_runtime oss;
357 #endif
358 
359 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
360         struct snd_pcm_hwptr_log *hwptr_log;
361 #endif
362 };
363 
364 struct snd_pcm_group {          /* keep linked substreams */
365         spinlock_t lock;
366         struct list_head substreams;
367         int count;
368 };
369 
370 struct pid;
371 
372 struct snd_pcm_substream {
373         struct snd_pcm *pcm;
374         struct snd_pcm_str *pstr;
375         void *private_data;             /* copied from pcm->private_data */
376         int number;
377         char name[32];                  /* substream name */
378         int stream;                     /* stream (direction) */
379         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
380         size_t buffer_bytes_max;        /* limit ring buffer size */
381         struct snd_dma_buffer dma_buffer;
382         unsigned int dma_buf_id;
383         size_t dma_max;
384         /* -- hardware operations -- */
385         struct snd_pcm_ops *ops;
386         /* -- runtime information -- */
387         struct snd_pcm_runtime *runtime;
388         /* -- timer section -- */
389         struct snd_timer *timer;                /* timer */
390         unsigned timer_running: 1;      /* time is running */
391         /* -- next substream -- */
392         struct snd_pcm_substream *next;
393         /* -- linked substreams -- */
394         struct list_head link_list;     /* linked list member */
395         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
396         struct snd_pcm_group *group;            /* pointer to current group */
397         /* -- assigned files -- */
398         void *file;
399         int ref_count;
400         atomic_t mmap_count;
401         unsigned int f_flags;
402         void (*pcm_release)(struct snd_pcm_substream *);
403         struct pid *pid;
404 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
405         /* -- OSS things -- */
406         struct snd_pcm_oss_substream oss;
407 #endif
408 #ifdef CONFIG_SND_VERBOSE_PROCFS
409         struct snd_info_entry *proc_root;
410         struct snd_info_entry *proc_info_entry;
411         struct snd_info_entry *proc_hw_params_entry;
412         struct snd_info_entry *proc_sw_params_entry;
413         struct snd_info_entry *proc_status_entry;
414         struct snd_info_entry *proc_prealloc_entry;
415         struct snd_info_entry *proc_prealloc_max_entry;
416 #endif
417         /* misc flags */
418         unsigned int hw_opened: 1;
419 };
420 
421 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
422 
423 
424 struct snd_pcm_str {
425         int stream;                             /* stream (direction) */
426         struct snd_pcm *pcm;
427         /* -- substreams -- */
428         unsigned int substream_count;
429         unsigned int substream_opened;
430         struct snd_pcm_substream *substream;
431 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
432         /* -- OSS things -- */
433         struct snd_pcm_oss_stream oss;
434 #endif
435 #ifdef CONFIG_SND_VERBOSE_PROCFS
436         struct snd_info_entry *proc_root;
437         struct snd_info_entry *proc_info_entry;
438 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
439         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
440         struct snd_info_entry *proc_xrun_debug_entry;
441 #endif
442 #endif
443         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
444 };
445 
446 struct snd_pcm {
447         struct snd_card *card;
448         struct list_head list;
449         int device; /* device number */
450         unsigned int info_flags;
451         unsigned short dev_class;
452         unsigned short dev_subclass;
453         char id[64];
454         char name[80];
455         struct snd_pcm_str streams[2];
456         struct mutex open_mutex;
457         wait_queue_head_t open_wait;
458         void *private_data;
459         void (*private_free) (struct snd_pcm *pcm);
460         struct device *dev; /* actual hw device this belongs to */
461         bool internal; /* pcm is for internal use only */
462 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
463         struct snd_pcm_oss oss;
464 #endif
465 };
466 
467 struct snd_pcm_notify {
468         int (*n_register) (struct snd_pcm * pcm);
469         int (*n_disconnect) (struct snd_pcm * pcm);
470         int (*n_unregister) (struct snd_pcm * pcm);
471         struct list_head list;
472 };
473 
474 /*
475  *  Registering
476  */
477 
478 extern const struct file_operations snd_pcm_f_ops[2];
479 
480 int snd_pcm_new(struct snd_card *card, const char *id, int device,
481                 int playback_count, int capture_count,
482                 struct snd_pcm **rpcm);
483 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
484                 int playback_count, int capture_count,
485                 struct snd_pcm **rpcm);
486 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
487 
488 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
489 
490 /*
491  *  Native I/O
492  */
493 
494 extern rwlock_t snd_pcm_link_rwlock;
495 
496 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
497 int snd_pcm_info_user(struct snd_pcm_substream *substream,
498                       struct snd_pcm_info __user *info);
499 int snd_pcm_status(struct snd_pcm_substream *substream,
500                    struct snd_pcm_status *status);
501 int snd_pcm_start(struct snd_pcm_substream *substream);
502 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
503 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
504 #ifdef CONFIG_PM
505 int snd_pcm_suspend(struct snd_pcm_substream *substream);
506 int snd_pcm_suspend_all(struct snd_pcm *pcm);
507 #endif
508 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
509 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
510                            struct snd_pcm_substream **rsubstream);
511 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
512 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
513                              struct snd_pcm_substream **rsubstream);
514 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
515 void snd_pcm_vma_notify_data(void *client, void *data);
516 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
517 
518 
519 #ifdef CONFIG_SND_DEBUG
520 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
521                            char *name, size_t len);
522 #else
523 static inline void
524 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
525 {
526         *buf = 0;
527 }
528 #endif
529 
530 /*
531  *  PCM library
532  */
533 
534 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
535 {
536         return substream->group != &substream->self_group;
537 }
538 
539 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
540 {
541         read_lock(&snd_pcm_link_rwlock);
542         spin_lock(&substream->self_group.lock);
543 }
544 
545 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
546 {
547         spin_unlock(&substream->self_group.lock);
548         read_unlock(&snd_pcm_link_rwlock);
549 }
550 
551 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
552 {
553         read_lock_irq(&snd_pcm_link_rwlock);
554         spin_lock(&substream->self_group.lock);
555 }
556 
557 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
558 {
559         spin_unlock(&substream->self_group.lock);
560         read_unlock_irq(&snd_pcm_link_rwlock);
561 }
562 
563 #define snd_pcm_stream_lock_irqsave(substream, flags) \
564 do { \
565         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
566         spin_lock(&substream->self_group.lock); \
567 } while (0)
568 
569 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
570 do { \
571         spin_unlock(&substream->self_group.lock); \
572         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
573 } while (0)
574 
575 #define snd_pcm_group_for_each_entry(s, substream) \
576         list_for_each_entry(s, &substream->group->substreams, link_list)
577 
578 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
579 {
580         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
581                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
582                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
583 }
584 
585 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
586 {
587         return size * 8 / runtime->sample_bits;
588 }
589 
590 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
591 {
592         return size * 8 / runtime->frame_bits;
593 }
594 
595 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
596 {
597         return size * runtime->sample_bits / 8;
598 }
599 
600 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
601 {
602         return size * runtime->frame_bits / 8;
603 }
604 
605 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
606 {
607         return bytes % runtime->byte_align == 0;
608 }
609 
610 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
611 {
612         struct snd_pcm_runtime *runtime = substream->runtime;
613         return frames_to_bytes(runtime, runtime->buffer_size);
614 }
615 
616 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
617 {
618         struct snd_pcm_runtime *runtime = substream->runtime;
619         return frames_to_bytes(runtime, runtime->period_size);
620 }
621 
622 /*
623  *  result is: 0 ... (boundary - 1)
624  */
625 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
626 {
627         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
628         if (avail < 0)
629                 avail += runtime->boundary;
630         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
631                 avail -= runtime->boundary;
632         return avail;
633 }
634 
635 /*
636  *  result is: 0 ... (boundary - 1)
637  */
638 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
639 {
640         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
641         if (avail < 0)
642                 avail += runtime->boundary;
643         return avail;
644 }
645 
646 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
647 {
648         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
649 }
650 
651 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
652 {
653         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
654 }
655 
656 /**
657  * snd_pcm_playback_ready - check whether the playback buffer is available
658  * @substream: the pcm substream instance
659  *
660  * Checks whether enough free space is available on the playback buffer.
661  *
662  * Returns non-zero if available, or zero if not.
663  */
664 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
665 {
666         struct snd_pcm_runtime *runtime = substream->runtime;
667         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
668 }
669 
670 /**
671  * snd_pcm_capture_ready - check whether the capture buffer is available
672  * @substream: the pcm substream instance
673  *
674  * Checks whether enough capture data is available on the capture buffer.
675  *
676  * Returns non-zero if available, or zero if not.
677  */
678 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
679 {
680         struct snd_pcm_runtime *runtime = substream->runtime;
681         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
682 }
683 
684 /**
685  * snd_pcm_playback_data - check whether any data exists on the playback buffer
686  * @substream: the pcm substream instance
687  *
688  * Checks whether any data exists on the playback buffer. If stop_threshold
689  * is bigger or equal to boundary, then this function returns always non-zero.
690  *
691  * Returns non-zero if exists, or zero if not.
692  */
693 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
694 {
695         struct snd_pcm_runtime *runtime = substream->runtime;
696         
697         if (runtime->stop_threshold >= runtime->boundary)
698                 return 1;
699         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
700 }
701 
702 /**
703  * snd_pcm_playback_empty - check whether the playback buffer is empty
704  * @substream: the pcm substream instance
705  *
706  * Checks whether the playback buffer is empty.
707  *
708  * Returns non-zero if empty, or zero if not.
709  */
710 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
711 {
712         struct snd_pcm_runtime *runtime = substream->runtime;
713         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
714 }
715 
716 /**
717  * snd_pcm_capture_empty - check whether the capture buffer is empty
718  * @substream: the pcm substream instance
719  *
720  * Checks whether the capture buffer is empty.
721  *
722  * Returns non-zero if empty, or zero if not.
723  */
724 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
725 {
726         struct snd_pcm_runtime *runtime = substream->runtime;
727         return snd_pcm_capture_avail(runtime) == 0;
728 }
729 
730 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
731                                         struct snd_pcm_substream *master)
732 {
733         substream->runtime->trigger_master = master;
734 }
735 
736 static inline int hw_is_mask(int var)
737 {
738         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
739                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
740 }
741 
742 static inline int hw_is_interval(int var)
743 {
744         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
745                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
746 }
747 
748 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
749                                      snd_pcm_hw_param_t var)
750 {
751         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
752 }
753 
754 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
755                                              snd_pcm_hw_param_t var)
756 {
757         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
758 }
759 
760 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
761                                              snd_pcm_hw_param_t var)
762 {
763         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
764 }
765 
766 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
767                                                      snd_pcm_hw_param_t var)
768 {
769         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
770 }
771 
772 #define params_channels(p) \
773         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
774 #define params_rate(p) \
775         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
776 #define params_period_size(p) \
777         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
778 #define params_periods(p) \
779         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
780 #define params_buffer_size(p) \
781         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
782 #define params_buffer_bytes(p) \
783         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
784 
785 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
786 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
787 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
788 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
789                           unsigned int k, struct snd_interval *c);
790 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
791                           const struct snd_interval *b, struct snd_interval *c);
792 int snd_interval_list(struct snd_interval *i, unsigned int count,
793                       const unsigned int *list, unsigned int mask);
794 int snd_interval_ratnum(struct snd_interval *i,
795                         unsigned int rats_count, struct snd_ratnum *rats,
796                         unsigned int *nump, unsigned int *denp);
797 
798 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
799 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
800 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
801 
802 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
803 
804 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
805 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
806 
807 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
808                                u_int32_t mask);
809 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
810                                  u_int64_t mask);
811 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
812                                  unsigned int min, unsigned int max);
813 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
814 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
815                                unsigned int cond,
816                                snd_pcm_hw_param_t var,
817                                const struct snd_pcm_hw_constraint_list *l);
818 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
819                                   unsigned int cond,
820                                   snd_pcm_hw_param_t var,
821                                   struct snd_pcm_hw_constraint_ratnums *r);
822 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
823                                   unsigned int cond,
824                                   snd_pcm_hw_param_t var,
825                                   struct snd_pcm_hw_constraint_ratdens *r);
826 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
827                                  unsigned int cond,
828                                  unsigned int width,
829                                  unsigned int msbits);
830 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
831                                unsigned int cond,
832                                snd_pcm_hw_param_t var,
833                                unsigned long step);
834 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
835                                unsigned int cond,
836                                snd_pcm_hw_param_t var);
837 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
838                                unsigned int base_rate);
839 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
840                         unsigned int cond,
841                         int var,
842                         snd_pcm_hw_rule_func_t func, void *private,
843                         int dep, ...);
844 
845 int snd_pcm_format_signed(snd_pcm_format_t format);
846 int snd_pcm_format_unsigned(snd_pcm_format_t format);
847 int snd_pcm_format_linear(snd_pcm_format_t format);
848 int snd_pcm_format_little_endian(snd_pcm_format_t format);
849 int snd_pcm_format_big_endian(snd_pcm_format_t format);
850 #if 0 /* just for DocBook */
851 /**
852  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
853  * @format: the format to check
854  *
855  * Returns 1 if the given PCM format is CPU-endian, 0 if
856  * opposite, or a negative error code if endian not specified.
857  */
858 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
859 #endif /* DocBook */
860 #ifdef SNDRV_LITTLE_ENDIAN
861 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
862 #else
863 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
864 #endif
865 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
866 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
867 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
868 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
869 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
870 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
871 
872 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
873 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
874 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
875 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
876                       unsigned int cmd, void *arg);                      
877 int snd_pcm_update_state(struct snd_pcm_substream *substream,
878                          struct snd_pcm_runtime *runtime);
879 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
880 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
881 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
882 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
883 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
884 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
885 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
886 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
887                                     const void __user *buf,
888                                     snd_pcm_uframes_t frames);
889 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
890                                    void __user *buf, snd_pcm_uframes_t frames);
891 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
892                                      void __user **bufs, snd_pcm_uframes_t frames);
893 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
894                                     void __user **bufs, snd_pcm_uframes_t frames);
895 
896 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
897 
898 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
899 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
900 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
901 
902 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
903                                               struct snd_dma_buffer *bufp)
904 {
905         struct snd_pcm_runtime *runtime = substream->runtime;
906         if (bufp) {
907                 runtime->dma_buffer_p = bufp;
908                 runtime->dma_area = bufp->area;
909                 runtime->dma_addr = bufp->addr;
910                 runtime->dma_bytes = bufp->bytes;
911         } else {
912                 runtime->dma_buffer_p = NULL;
913                 runtime->dma_area = NULL;
914                 runtime->dma_addr = 0;
915                 runtime->dma_bytes = 0;
916         }
917 }
918 
919 /*
920  *  Timer interface
921  */
922 
923 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
924 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
925 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
926 
927 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
928                                    struct timespec *tv)
929 {
930         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
931                 do_posix_clock_monotonic_gettime(tv);
932         else
933                 getnstimeofday(tv);
934 }
935 
936 /*
937  *  Memory
938  */
939 
940 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
941 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
942 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
943                                   int type, struct device *data,
944                                   size_t size, size_t max);
945 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
946                                           int type, void *data,
947                                           size_t size, size_t max);
948 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
949 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
950 
951 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
952                                       size_t size, gfp_t gfp_flags);
953 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
954 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
955                                           unsigned long offset);
956 #if 0 /* for kernel-doc */
957 /**
958  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
959  * @substream: the substream to allocate the buffer to
960  * @size: the requested buffer size, in bytes
961  *
962  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
963  * contiguous in kernel virtual space, but not in physical memory.  Use this
964  * if the buffer is accessed by kernel code but not by device DMA.
965  *
966  * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
967  * code.
968  */
969 static int snd_pcm_lib_alloc_vmalloc_buffer
970                         (struct snd_pcm_substream *substream, size_t size);
971 /**
972  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
973  * @substream: the substream to allocate the buffer to
974  * @size: the requested buffer size, in bytes
975  *
976  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
977  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
978  */
979 static int snd_pcm_lib_alloc_vmalloc_32_buffer
980                         (struct snd_pcm_substream *substream, size_t size);
981 #endif
982 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
983         _snd_pcm_lib_alloc_vmalloc_buffer \
984                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
985 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
986         _snd_pcm_lib_alloc_vmalloc_buffer \
987                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
988 
989 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
990 
991 #ifdef CONFIG_SND_DMA_SGBUF
992 /*
993  * SG-buffer handling
994  */
995 #define snd_pcm_substream_sgbuf(substream) \
996         snd_pcm_get_dma_buf(substream)->private_data
997 
998 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
999                                     unsigned long offset);
1000 #else /* !SND_DMA_SGBUF */
1001 /*
1002  * fake using a continuous buffer
1003  */
1004 #define snd_pcm_sgbuf_ops_page  NULL
1005 #endif /* SND_DMA_SGBUF */
1006 
1007 static inline dma_addr_t
1008 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1009 {
1010         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1011 }
1012 
1013 static inline void *
1014 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1015 {
1016         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1017 }
1018 
1019 static inline unsigned int
1020 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1021                              unsigned int ofs, unsigned int size)
1022 {
1023         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1024 }
1025 
1026 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1027 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1028 {
1029         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1030         atomic_inc(&substream->mmap_count);
1031 }
1032 
1033 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1034 {
1035         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1036         atomic_dec(&substream->mmap_count);
1037 }
1038 
1039 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1040                              struct vm_area_struct *area);
1041 /* mmap for io-memory area */
1042 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1043 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1044 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1045 #else
1046 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1047 #define snd_pcm_lib_mmap_iomem  NULL
1048 #endif
1049 
1050 #define snd_pcm_lib_mmap_vmalloc NULL
1051 
1052 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1053 {
1054         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1055 }
1056 
1057 /*
1058  *  Misc
1059  */
1060 
1061 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1062                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1063                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1064                                          (IEC958_AES3_CON_FS_48000<<24))
1065 
1066 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1067 
1068 const char *snd_pcm_format_name(snd_pcm_format_t format);
1069 
1070 /**
1071  * snd_pcm_stream_str - Get a string naming the direction of a stream
1072  * @substream: the pcm substream instance
1073  */
1074 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1075 {
1076         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1077                 return "Playback";
1078         else
1079                 return "Capture";
1080 }
1081 
1082 /*
1083  * PCM channel-mapping control API
1084  */
1085 /* array element of channel maps */
1086 struct snd_pcm_chmap_elem {
1087         unsigned char channels;
1088         unsigned char map[15];
1089 };
1090 
1091 /* channel map information; retrieved via snd_kcontrol_chip() */
1092 struct snd_pcm_chmap {
1093         struct snd_pcm *pcm;    /* assigned PCM instance */
1094         int stream;             /* PLAYBACK or CAPTURE */
1095         struct snd_kcontrol *kctl;
1096         const struct snd_pcm_chmap_elem *chmap;
1097         unsigned int max_channels;
1098         unsigned int channel_mask;      /* optional: active channels bitmask */
1099         void *private_data;     /* optional: private data pointer */
1100 };
1101 
1102 /* get the PCM substream assigned to the given chmap info */
1103 static inline struct snd_pcm_substream *
1104 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1105 {
1106         struct snd_pcm_substream *s;
1107         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1108                 if (s->number == idx)
1109                         return s;
1110         return NULL;
1111 }
1112 
1113 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1114 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1115 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1116 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1117 
1118 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1119 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1120 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1121 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1122 
1123 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1124                            const struct snd_pcm_chmap_elem *chmap,
1125                            int max_channels,
1126                            unsigned long private_value,
1127                            struct snd_pcm_chmap **info_ret);
1128 
1129 #endif /* __SOUND_PCM_H */
1130 

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