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

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  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_audio_tstamp_config; /* definitions further down */
 64 struct snd_pcm_audio_tstamp_report;
 65 
 66 struct snd_pcm_ops {
 67         int (*open)(struct snd_pcm_substream *substream);
 68         int (*close)(struct snd_pcm_substream *substream);
 69         int (*ioctl)(struct snd_pcm_substream * substream,
 70                      unsigned int cmd, void *arg);
 71         int (*hw_params)(struct snd_pcm_substream *substream,
 72                          struct snd_pcm_hw_params *params);
 73         int (*hw_free)(struct snd_pcm_substream *substream);
 74         int (*prepare)(struct snd_pcm_substream *substream);
 75         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
 76         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
 77         int (*get_time_info)(struct snd_pcm_substream *substream,
 78                         struct timespec *system_ts, struct timespec *audio_ts,
 79                         struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
 80                         struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
 81         int (*copy)(struct snd_pcm_substream *substream, int channel,
 82                     snd_pcm_uframes_t pos,
 83                     void __user *buf, snd_pcm_uframes_t count);
 84         int (*silence)(struct snd_pcm_substream *substream, int channel, 
 85                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
 86         struct page *(*page)(struct snd_pcm_substream *substream,
 87                              unsigned long offset);
 88         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
 89         int (*ack)(struct snd_pcm_substream *substream);
 90 };
 91 
 92 /*
 93  *
 94  */
 95 
 96 #if defined(CONFIG_SND_DYNAMIC_MINORS)
 97 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
 98 #else
 99 #define SNDRV_PCM_DEVICES       8
100 #endif
101 
102 #define SNDRV_PCM_IOCTL1_RESET          0
103 #define SNDRV_PCM_IOCTL1_INFO           1
104 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
105 #define SNDRV_PCM_IOCTL1_GSTATE         3
106 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
107 
108 #define SNDRV_PCM_TRIGGER_STOP          0
109 #define SNDRV_PCM_TRIGGER_START         1
110 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
111 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
112 #define SNDRV_PCM_TRIGGER_SUSPEND       5
113 #define SNDRV_PCM_TRIGGER_RESUME        6
114 #define SNDRV_PCM_TRIGGER_DRAIN         7
115 
116 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
117 
118 /* If you change this don't forget to change rates[] table in pcm_native.c */
119 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
120 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
121 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
122 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
123 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
124 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
125 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
126 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
127 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
128 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
129 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
130 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
131 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
132 
133 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
134 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
135 
136 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
137                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
138                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
139 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
140 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
141                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
142 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
143                                          SNDRV_PCM_RATE_192000)
144 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
145 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
146 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
147 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
148 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
149 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
150 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
151 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
152 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
153 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
154 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
155 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
156 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
157 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
158 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
159 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
160 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
161 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
162 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
163 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
164 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
165 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
166 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
167 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
168 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
169 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
170 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
171 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
172 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
173 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
174 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
175 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
176 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
177 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
178 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
179 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
180 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
181 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
182 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
183 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
184 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
185 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
186 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
187 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
188 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
189 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
190 #define SNDRV_PCM_FMTBIT_DSD_U16_BE     _SNDRV_PCM_FMTBIT(DSD_U16_BE)
191 #define SNDRV_PCM_FMTBIT_DSD_U32_BE     _SNDRV_PCM_FMTBIT(DSD_U32_BE)
192 
193 #ifdef SNDRV_LITTLE_ENDIAN
194 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
195 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
196 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
197 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
198 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
199 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
200 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
201 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
202 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
203 #endif
204 #ifdef SNDRV_BIG_ENDIAN
205 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
206 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
207 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
208 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
209 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
210 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
211 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
212 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
213 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
214 #endif
215 
216 struct snd_pcm_file {
217         struct snd_pcm_substream *substream;
218         int no_compat_mmap;
219 };
220 
221 struct snd_pcm_hw_rule;
222 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
223                                       struct snd_pcm_hw_rule *rule);
224 
225 struct snd_pcm_hw_rule {
226         unsigned int cond;
227         int var;
228         int deps[4];
229 
230         snd_pcm_hw_rule_func_t func;
231         void *private;
232 };
233 
234 struct snd_pcm_hw_constraints {
235         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
236                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
237         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
238                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
239         unsigned int rules_num;
240         unsigned int rules_all;
241         struct snd_pcm_hw_rule *rules;
242 };
243 
244 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
245                                             snd_pcm_hw_param_t var)
246 {
247         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
248 }
249 
250 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
251                                                     snd_pcm_hw_param_t var)
252 {
253         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
254 }
255 
256 struct snd_ratnum {
257         unsigned int num;
258         unsigned int den_min, den_max, den_step;
259 };
260 
261 struct snd_ratden {
262         unsigned int num_min, num_max, num_step;
263         unsigned int den;
264 };
265 
266 struct snd_pcm_hw_constraint_ratnums {
267         int nrats;
268         const struct snd_ratnum *rats;
269 };
270 
271 struct snd_pcm_hw_constraint_ratdens {
272         int nrats;
273         const struct snd_ratden *rats;
274 };
275 
276 struct snd_pcm_hw_constraint_list {
277         const unsigned int *list;
278         unsigned int count;
279         unsigned int mask;
280 };
281 
282 struct snd_pcm_hw_constraint_ranges {
283         unsigned int count;
284         const struct snd_interval *ranges;
285         unsigned int mask;
286 };
287 
288 /*
289  * userspace-provided audio timestamp config to kernel,
290  * structure is for internal use only and filled with dedicated unpack routine
291  */
292 struct snd_pcm_audio_tstamp_config {
293         /* 5 of max 16 bits used */
294         u32 type_requested:4;
295         u32 report_delay:1; /* add total delay to A/D or D/A */
296 };
297 
298 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
299                                                 struct snd_pcm_audio_tstamp_config *config)
300 {
301         config->type_requested = data & 0xF;
302         config->report_delay = (data >> 4) & 1;
303 }
304 
305 /*
306  * kernel-provided audio timestamp report to user-space
307  * structure is for internal use only and read by dedicated pack routine
308  */
309 struct snd_pcm_audio_tstamp_report {
310         /* 6 of max 16 bits used for bit-fields */
311 
312         /* for backwards compatibility */
313         u32 valid:1;
314 
315         /* actual type if hardware could not support requested timestamp */
316         u32 actual_type:4;
317 
318         /* accuracy represented in ns units */
319         u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
320         u32 accuracy; /* up to 4.29s, will be packed in separate field  */
321 };
322 
323 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
324                                                 const struct snd_pcm_audio_tstamp_report *report)
325 {
326         u32 tmp;
327 
328         tmp = report->accuracy_report;
329         tmp <<= 4;
330         tmp |= report->actual_type;
331         tmp <<= 1;
332         tmp |= report->valid;
333 
334         *data &= 0xffff; /* zero-clear MSBs */
335         *data |= (tmp << 16);
336         *accuracy = report->accuracy;
337 }
338 
339 
340 struct snd_pcm_runtime {
341         /* -- Status -- */
342         struct snd_pcm_substream *trigger_master;
343         struct timespec trigger_tstamp; /* trigger timestamp */
344         bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
345         int overrange;
346         snd_pcm_uframes_t avail_max;
347         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
348         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
349         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
350         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
351         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
352         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
353 
354         /* -- HW params -- */
355         snd_pcm_access_t access;        /* access mode */
356         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
357         snd_pcm_subformat_t subformat;  /* subformat */
358         unsigned int rate;              /* rate in Hz */
359         unsigned int channels;          /* channels */
360         snd_pcm_uframes_t period_size;  /* period size */
361         unsigned int periods;           /* periods */
362         snd_pcm_uframes_t buffer_size;  /* buffer size */
363         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
364         size_t byte_align;
365         unsigned int frame_bits;
366         unsigned int sample_bits;
367         unsigned int info;
368         unsigned int rate_num;
369         unsigned int rate_den;
370         unsigned int no_period_wakeup: 1;
371 
372         /* -- SW params -- */
373         int tstamp_mode;                /* mmap timestamp is updated */
374         unsigned int period_step;
375         snd_pcm_uframes_t start_threshold;
376         snd_pcm_uframes_t stop_threshold;
377         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
378                                                 noise is nearest than this */
379         snd_pcm_uframes_t silence_size; /* Silence filling size */
380         snd_pcm_uframes_t boundary;     /* pointers wrap point */
381 
382         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
383         snd_pcm_uframes_t silence_filled; /* size filled with silence */
384 
385         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
386 
387         /* -- mmap -- */
388         struct snd_pcm_mmap_status *status;
389         struct snd_pcm_mmap_control *control;
390 
391         /* -- locking / scheduling -- */
392         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
393         wait_queue_head_t sleep;        /* poll sleep */
394         wait_queue_head_t tsleep;       /* transfer sleep */
395         struct fasync_struct *fasync;
396 
397         /* -- private section -- */
398         void *private_data;
399         void (*private_free)(struct snd_pcm_runtime *runtime);
400 
401         /* -- hardware description -- */
402         struct snd_pcm_hardware hw;
403         struct snd_pcm_hw_constraints hw_constraints;
404 
405         /* -- timer -- */
406         unsigned int timer_resolution;  /* timer resolution */
407         int tstamp_type;                /* timestamp type */
408 
409         /* -- DMA -- */           
410         unsigned char *dma_area;        /* DMA area */
411         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
412         size_t dma_bytes;               /* size of DMA area */
413 
414         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
415 
416         /* -- audio timestamp config -- */
417         struct snd_pcm_audio_tstamp_config audio_tstamp_config;
418         struct snd_pcm_audio_tstamp_report audio_tstamp_report;
419         struct timespec driver_tstamp;
420 
421 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
422         /* -- OSS things -- */
423         struct snd_pcm_oss_runtime oss;
424 #endif
425 };
426 
427 struct snd_pcm_group {          /* keep linked substreams */
428         spinlock_t lock;
429         struct mutex mutex;
430         struct list_head substreams;
431         int count;
432 };
433 
434 struct pid;
435 
436 struct snd_pcm_substream {
437         struct snd_pcm *pcm;
438         struct snd_pcm_str *pstr;
439         void *private_data;             /* copied from pcm->private_data */
440         int number;
441         char name[32];                  /* substream name */
442         int stream;                     /* stream (direction) */
443         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
444         size_t buffer_bytes_max;        /* limit ring buffer size */
445         struct snd_dma_buffer dma_buffer;
446         size_t dma_max;
447         /* -- hardware operations -- */
448         const struct snd_pcm_ops *ops;
449         /* -- runtime information -- */
450         struct snd_pcm_runtime *runtime;
451         /* -- timer section -- */
452         struct snd_timer *timer;                /* timer */
453         unsigned timer_running: 1;      /* time is running */
454         /* -- next substream -- */
455         struct snd_pcm_substream *next;
456         /* -- linked substreams -- */
457         struct list_head link_list;     /* linked list member */
458         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
459         struct snd_pcm_group *group;            /* pointer to current group */
460         /* -- assigned files -- */
461         void *file;
462         int ref_count;
463         atomic_t mmap_count;
464         unsigned int f_flags;
465         void (*pcm_release)(struct snd_pcm_substream *);
466         struct pid *pid;
467 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
468         /* -- OSS things -- */
469         struct snd_pcm_oss_substream oss;
470 #endif
471 #ifdef CONFIG_SND_VERBOSE_PROCFS
472         struct snd_info_entry *proc_root;
473         struct snd_info_entry *proc_info_entry;
474         struct snd_info_entry *proc_hw_params_entry;
475         struct snd_info_entry *proc_sw_params_entry;
476         struct snd_info_entry *proc_status_entry;
477         struct snd_info_entry *proc_prealloc_entry;
478         struct snd_info_entry *proc_prealloc_max_entry;
479 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
480         struct snd_info_entry *proc_xrun_injection_entry;
481 #endif
482 #endif /* CONFIG_SND_VERBOSE_PROCFS */
483         /* misc flags */
484         unsigned int hw_opened: 1;
485 };
486 
487 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
488 
489 
490 struct snd_pcm_str {
491         int stream;                             /* stream (direction) */
492         struct snd_pcm *pcm;
493         /* -- substreams -- */
494         unsigned int substream_count;
495         unsigned int substream_opened;
496         struct snd_pcm_substream *substream;
497 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
498         /* -- OSS things -- */
499         struct snd_pcm_oss_stream oss;
500 #endif
501 #ifdef CONFIG_SND_VERBOSE_PROCFS
502         struct snd_info_entry *proc_root;
503         struct snd_info_entry *proc_info_entry;
504 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
505         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
506         struct snd_info_entry *proc_xrun_debug_entry;
507 #endif
508 #endif
509         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
510         struct device dev;
511 };
512 
513 struct snd_pcm {
514         struct snd_card *card;
515         struct list_head list;
516         int device; /* device number */
517         unsigned int info_flags;
518         unsigned short dev_class;
519         unsigned short dev_subclass;
520         char id[64];
521         char name[80];
522         struct snd_pcm_str streams[2];
523         struct mutex open_mutex;
524         wait_queue_head_t open_wait;
525         void *private_data;
526         void (*private_free) (struct snd_pcm *pcm);
527         bool internal; /* pcm is for internal use only */
528         bool nonatomic; /* whole PCM operations are in non-atomic context */
529 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
530         struct snd_pcm_oss oss;
531 #endif
532 };
533 
534 struct snd_pcm_notify {
535         int (*n_register) (struct snd_pcm * pcm);
536         int (*n_disconnect) (struct snd_pcm * pcm);
537         int (*n_unregister) (struct snd_pcm * pcm);
538         struct list_head list;
539 };
540 
541 /*
542  *  Registering
543  */
544 
545 extern const struct file_operations snd_pcm_f_ops[2];
546 
547 int snd_pcm_new(struct snd_card *card, const char *id, int device,
548                 int playback_count, int capture_count,
549                 struct snd_pcm **rpcm);
550 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
551                 int playback_count, int capture_count,
552                 struct snd_pcm **rpcm);
553 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
554 
555 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
556 
557 /*
558  *  Native I/O
559  */
560 
561 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
562 int snd_pcm_info_user(struct snd_pcm_substream *substream,
563                       struct snd_pcm_info __user *info);
564 int snd_pcm_status(struct snd_pcm_substream *substream,
565                    struct snd_pcm_status *status);
566 int snd_pcm_start(struct snd_pcm_substream *substream);
567 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
568 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
569 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
570 #ifdef CONFIG_PM
571 int snd_pcm_suspend(struct snd_pcm_substream *substream);
572 int snd_pcm_suspend_all(struct snd_pcm *pcm);
573 #else
574 static inline int snd_pcm_suspend(struct snd_pcm_substream *substream)
575 {
576         return 0;
577 }
578 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
579 {
580         return 0;
581 }
582 #endif
583 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
584 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
585                            struct snd_pcm_substream **rsubstream);
586 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
587 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
588                              struct snd_pcm_substream **rsubstream);
589 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
590 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
591 
592 
593 #ifdef CONFIG_SND_DEBUG
594 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
595                            char *name, size_t len);
596 #else
597 static inline void
598 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
599 {
600         *buf = 0;
601 }
602 #endif
603 
604 /*
605  *  PCM library
606  */
607 
608 /**
609  * snd_pcm_stream_linked - Check whether the substream is linked with others
610  * @substream: substream to check
611  *
612  * Returns true if the given substream is being linked with others.
613  */
614 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
615 {
616         return substream->group != &substream->self_group;
617 }
618 
619 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
620 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
621 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
622 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
623 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
624 
625 /**
626  * snd_pcm_stream_lock_irqsave - Lock the PCM stream
627  * @substream: PCM substream
628  * @flags: irq flags
629  *
630  * This locks the PCM stream like snd_pcm_stream_lock() but with the local
631  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
632  * as snd_pcm_stream_lock().
633  */
634 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
635         do {                                                     \
636                 typecheck(unsigned long, flags);                 \
637                 flags = _snd_pcm_stream_lock_irqsave(substream); \
638         } while (0)
639 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
640                                       unsigned long flags);
641 
642 /**
643  * snd_pcm_group_for_each_entry - iterate over the linked substreams
644  * @s: the iterator
645  * @substream: the substream
646  *
647  * Iterate over the all linked substreams to the given @substream.
648  * When @substream isn't linked with any others, this gives returns @substream
649  * itself once.
650  */
651 #define snd_pcm_group_for_each_entry(s, substream) \
652         list_for_each_entry(s, &substream->group->substreams, link_list)
653 
654 /**
655  * snd_pcm_running - Check whether the substream is in a running state
656  * @substream: substream to check
657  *
658  * Returns true if the given substream is in the state RUNNING, or in the
659  * state DRAINING for playback.
660  */
661 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
662 {
663         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
664                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
665                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
666 }
667 
668 /**
669  * bytes_to_samples - Unit conversion of the size from bytes to samples
670  * @runtime: PCM runtime instance
671  * @size: size in bytes
672  */
673 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
674 {
675         return size * 8 / runtime->sample_bits;
676 }
677 
678 /**
679  * bytes_to_frames - Unit conversion of the size from bytes to frames
680  * @runtime: PCM runtime instance
681  * @size: size in bytes
682  */
683 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
684 {
685         return size * 8 / runtime->frame_bits;
686 }
687 
688 /**
689  * samples_to_bytes - Unit conversion of the size from samples to bytes
690  * @runtime: PCM runtime instance
691  * @size: size in samples
692  */
693 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
694 {
695         return size * runtime->sample_bits / 8;
696 }
697 
698 /**
699  * frames_to_bytes - Unit conversion of the size from frames to bytes
700  * @runtime: PCM runtime instance
701  * @size: size in frames
702  */
703 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
704 {
705         return size * runtime->frame_bits / 8;
706 }
707 
708 /**
709  * frame_aligned - Check whether the byte size is aligned to frames
710  * @runtime: PCM runtime instance
711  * @bytes: size in bytes
712  */
713 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
714 {
715         return bytes % runtime->byte_align == 0;
716 }
717 
718 /**
719  * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
720  * @substream: PCM substream
721  */
722 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
723 {
724         struct snd_pcm_runtime *runtime = substream->runtime;
725         return frames_to_bytes(runtime, runtime->buffer_size);
726 }
727 
728 /**
729  * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
730  * @substream: PCM substream
731  */
732 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
733 {
734         struct snd_pcm_runtime *runtime = substream->runtime;
735         return frames_to_bytes(runtime, runtime->period_size);
736 }
737 
738 /**
739  * snd_pcm_playback_avail - Get the available (writable) space for playback
740  * @runtime: PCM runtime instance
741  *
742  * Result is between 0 ... (boundary - 1)
743  */
744 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
745 {
746         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
747         if (avail < 0)
748                 avail += runtime->boundary;
749         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
750                 avail -= runtime->boundary;
751         return avail;
752 }
753 
754 /**
755  * snd_pcm_playback_avail - Get the available (readable) space for capture
756  * @runtime: PCM runtime instance
757  *
758  * Result is between 0 ... (boundary - 1)
759  */
760 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
761 {
762         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
763         if (avail < 0)
764                 avail += runtime->boundary;
765         return avail;
766 }
767 
768 /**
769  * snd_pcm_playback_hw_avail - Get the queued space for playback
770  * @runtime: PCM runtime instance
771  */
772 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
773 {
774         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
775 }
776 
777 /**
778  * snd_pcm_capture_hw_avail - Get the free space for capture
779  * @runtime: PCM runtime instance
780  */
781 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
782 {
783         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
784 }
785 
786 /**
787  * snd_pcm_playback_ready - check whether the playback buffer is available
788  * @substream: the pcm substream instance
789  *
790  * Checks whether enough free space is available on the playback buffer.
791  *
792  * Return: Non-zero if available, or zero if not.
793  */
794 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
795 {
796         struct snd_pcm_runtime *runtime = substream->runtime;
797         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
798 }
799 
800 /**
801  * snd_pcm_capture_ready - check whether the capture buffer is available
802  * @substream: the pcm substream instance
803  *
804  * Checks whether enough capture data is available on the capture buffer.
805  *
806  * Return: Non-zero if available, or zero if not.
807  */
808 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
809 {
810         struct snd_pcm_runtime *runtime = substream->runtime;
811         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
812 }
813 
814 /**
815  * snd_pcm_playback_data - check whether any data exists on the playback buffer
816  * @substream: the pcm substream instance
817  *
818  * Checks whether any data exists on the playback buffer.
819  *
820  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
821  * is bigger or equal to boundary, then this function returns always non-zero.
822  */
823 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
824 {
825         struct snd_pcm_runtime *runtime = substream->runtime;
826         
827         if (runtime->stop_threshold >= runtime->boundary)
828                 return 1;
829         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
830 }
831 
832 /**
833  * snd_pcm_playback_empty - check whether the playback buffer is empty
834  * @substream: the pcm substream instance
835  *
836  * Checks whether the playback buffer is empty.
837  *
838  * Return: Non-zero if empty, or zero if not.
839  */
840 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
841 {
842         struct snd_pcm_runtime *runtime = substream->runtime;
843         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
844 }
845 
846 /**
847  * snd_pcm_capture_empty - check whether the capture buffer is empty
848  * @substream: the pcm substream instance
849  *
850  * Checks whether the capture buffer is empty.
851  *
852  * Return: Non-zero if empty, or zero if not.
853  */
854 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
855 {
856         struct snd_pcm_runtime *runtime = substream->runtime;
857         return snd_pcm_capture_avail(runtime) == 0;
858 }
859 
860 /**
861  * snd_pcm_trigger_done - Mark the master substream
862  * @substream: the pcm substream instance
863  * @master: the linked master substream
864  *
865  * When multiple substreams of the same card are linked and the hardware
866  * supports the single-shot operation, the driver calls this in the loop
867  * in snd_pcm_group_for_each_entry() for marking the substream as "done".
868  * Then most of trigger operations are performed only to the given master
869  * substream.
870  *
871  * The trigger_master mark is cleared at timestamp updates at the end
872  * of trigger operations.
873  */
874 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
875                                         struct snd_pcm_substream *master)
876 {
877         substream->runtime->trigger_master = master;
878 }
879 
880 static inline int hw_is_mask(int var)
881 {
882         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
883                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
884 }
885 
886 static inline int hw_is_interval(int var)
887 {
888         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
889                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
890 }
891 
892 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
893                                      snd_pcm_hw_param_t var)
894 {
895         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
896 }
897 
898 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
899                                              snd_pcm_hw_param_t var)
900 {
901         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
902 }
903 
904 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
905                                              snd_pcm_hw_param_t var)
906 {
907         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
908 }
909 
910 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
911                                                      snd_pcm_hw_param_t var)
912 {
913         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
914 }
915 
916 /**
917  * params_channels - Get the number of channels from the hw params
918  * @p: hw params
919  */
920 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
921 {
922         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
923 }
924 
925 /**
926  * params_rate - Get the sample rate from the hw params
927  * @p: hw params
928  */
929 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
930 {
931         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
932 }
933 
934 /**
935  * params_period_size - Get the period size (in frames) from the hw params
936  * @p: hw params
937  */
938 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
939 {
940         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
941 }
942 
943 /**
944  * params_periods - Get the number of periods from the hw params
945  * @p: hw params
946  */
947 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
948 {
949         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
950 }
951 
952 /**
953  * params_buffer_size - Get the buffer size (in frames) from the hw params
954  * @p: hw params
955  */
956 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
957 {
958         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
959 }
960 
961 /**
962  * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
963  * @p: hw params
964  */
965 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
966 {
967         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
968 }
969 
970 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
971 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
972 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
973 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
974                           unsigned int k, struct snd_interval *c);
975 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
976                           const struct snd_interval *b, struct snd_interval *c);
977 int snd_interval_list(struct snd_interval *i, unsigned int count,
978                       const unsigned int *list, unsigned int mask);
979 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
980                         const struct snd_interval *list, unsigned int mask);
981 int snd_interval_ratnum(struct snd_interval *i,
982                         unsigned int rats_count, const struct snd_ratnum *rats,
983                         unsigned int *nump, unsigned int *denp);
984 
985 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
986 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
987 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
988 
989 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
990 
991 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
992 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
993 
994 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
995                                u_int32_t mask);
996 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
997                                  u_int64_t mask);
998 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
999                                  unsigned int min, unsigned int max);
1000 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1001 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
1002                                unsigned int cond,
1003                                snd_pcm_hw_param_t var,
1004                                const struct snd_pcm_hw_constraint_list *l);
1005 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1006                                  unsigned int cond,
1007                                  snd_pcm_hw_param_t var,
1008                                  const struct snd_pcm_hw_constraint_ranges *r);
1009 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
1010                                   unsigned int cond,
1011                                   snd_pcm_hw_param_t var,
1012                                   const struct snd_pcm_hw_constraint_ratnums *r);
1013 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
1014                                   unsigned int cond,
1015                                   snd_pcm_hw_param_t var,
1016                                   const struct snd_pcm_hw_constraint_ratdens *r);
1017 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
1018                                  unsigned int cond,
1019                                  unsigned int width,
1020                                  unsigned int msbits);
1021 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1022                                unsigned int cond,
1023                                snd_pcm_hw_param_t var,
1024                                unsigned long step);
1025 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1026                                unsigned int cond,
1027                                snd_pcm_hw_param_t var);
1028 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1029                                unsigned int base_rate);
1030 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1031                         unsigned int cond,
1032                         int var,
1033                         snd_pcm_hw_rule_func_t func, void *private,
1034                         int dep, ...);
1035 
1036 /**
1037  * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1038  * @runtime: PCM runtime instance
1039  * @var: The hw_params variable to constrain
1040  * @val: The value to constrain to
1041  *
1042  * Return: Positive if the value is changed, zero if it's not changed, or a
1043  * negative error code.
1044  */
1045 static inline int snd_pcm_hw_constraint_single(
1046         struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1047         unsigned int val)
1048 {
1049         return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1050 }
1051 
1052 int snd_pcm_format_signed(snd_pcm_format_t format);
1053 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1054 int snd_pcm_format_linear(snd_pcm_format_t format);
1055 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1056 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1057 #if 0 /* just for DocBook */
1058 /**
1059  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1060  * @format: the format to check
1061  *
1062  * Return: 1 if the given PCM format is CPU-endian, 0 if
1063  * opposite, or a negative error code if endian not specified.
1064  */
1065 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1066 #endif /* DocBook */
1067 #ifdef SNDRV_LITTLE_ENDIAN
1068 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1069 #else
1070 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1071 #endif
1072 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
1073 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
1074 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1075 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1076 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1077 
1078 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1079                      const struct snd_pcm_ops *ops);
1080 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1081 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1082                       unsigned int cmd, void *arg);                      
1083 int snd_pcm_update_state(struct snd_pcm_substream *substream,
1084                          struct snd_pcm_runtime *runtime);
1085 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
1086 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
1087 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1088 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
1089                                     const void __user *buf,
1090                                     snd_pcm_uframes_t frames);
1091 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
1092                                    void __user *buf, snd_pcm_uframes_t frames);
1093 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1094                                      void __user **bufs, snd_pcm_uframes_t frames);
1095 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1096                                     void __user **bufs, snd_pcm_uframes_t frames);
1097 
1098 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
1099 
1100 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1101 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1102 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1103 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1104                                          unsigned int rates_b);
1105 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1106                                         unsigned int rate_max);
1107 
1108 /**
1109  * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1110  * @substream: PCM substream to set
1111  * @bufp: the buffer information, NULL to clear
1112  *
1113  * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1114  * Otherwise it clears the current buffer information.
1115  */
1116 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1117                                               struct snd_dma_buffer *bufp)
1118 {
1119         struct snd_pcm_runtime *runtime = substream->runtime;
1120         if (bufp) {
1121                 runtime->dma_buffer_p = bufp;
1122                 runtime->dma_area = bufp->area;
1123                 runtime->dma_addr = bufp->addr;
1124                 runtime->dma_bytes = bufp->bytes;
1125         } else {
1126                 runtime->dma_buffer_p = NULL;
1127                 runtime->dma_area = NULL;
1128                 runtime->dma_addr = 0;
1129                 runtime->dma_bytes = 0;
1130         }
1131 }
1132 
1133 /*
1134  *  Timer interface
1135  */
1136 
1137 #ifdef CONFIG_SND_PCM_TIMER
1138 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
1139 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
1140 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
1141 #else
1142 static inline void
1143 snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream) {}
1144 static inline void snd_pcm_timer_init(struct snd_pcm_substream *substream) {}
1145 static inline void snd_pcm_timer_done(struct snd_pcm_substream *substream) {}
1146 #endif
1147 /**
1148  * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1149  * @runtime: PCM runtime instance
1150  * @tv: timespec to fill
1151  */
1152 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1153                                    struct timespec *tv)
1154 {
1155         switch (runtime->tstamp_type) {
1156         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1157                 ktime_get_ts(tv);
1158                 break;
1159         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1160                 getrawmonotonic(tv);
1161                 break;
1162         default:
1163                 getnstimeofday(tv);
1164                 break;
1165         }
1166 }
1167 
1168 /*
1169  *  Memory
1170  */
1171 
1172 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1173 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1174 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1175                                   int type, struct device *data,
1176                                   size_t size, size_t max);
1177 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1178                                           int type, void *data,
1179                                           size_t size, size_t max);
1180 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1181 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1182 
1183 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1184                                       size_t size, gfp_t gfp_flags);
1185 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1186 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1187                                           unsigned long offset);
1188 /**
1189  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1190  * @substream: the substream to allocate the buffer to
1191  * @size: the requested buffer size, in bytes
1192  *
1193  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1194  * contiguous in kernel virtual space, but not in physical memory.  Use this
1195  * if the buffer is accessed by kernel code but not by device DMA.
1196  *
1197  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1198  * code.
1199  */
1200 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1201                         (struct snd_pcm_substream *substream, size_t size)
1202 {
1203         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1204                                                  GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1205 }
1206 
1207 /**
1208  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1209  * @substream: the substream to allocate the buffer to
1210  * @size: the requested buffer size, in bytes
1211  *
1212  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1213  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1214  *
1215  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1216  * code.
1217  */
1218 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1219                         (struct snd_pcm_substream *substream, size_t size)
1220 {
1221         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1222                                                  GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1223 }
1224 
1225 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1226 
1227 #ifdef CONFIG_SND_DMA_SGBUF
1228 /*
1229  * SG-buffer handling
1230  */
1231 #define snd_pcm_substream_sgbuf(substream) \
1232         snd_pcm_get_dma_buf(substream)->private_data
1233 
1234 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1235                                     unsigned long offset);
1236 #else /* !SND_DMA_SGBUF */
1237 /*
1238  * fake using a continuous buffer
1239  */
1240 #define snd_pcm_sgbuf_ops_page  NULL
1241 #endif /* SND_DMA_SGBUF */
1242 
1243 /**
1244  * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1245  * @substream: PCM substream
1246  * @ofs: byte offset
1247  */
1248 static inline dma_addr_t
1249 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1250 {
1251         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1252 }
1253 
1254 /**
1255  * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1256  * @substream: PCM substream
1257  * @ofs: byte offset
1258  */
1259 static inline void *
1260 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1261 {
1262         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1263 }
1264 
1265 /**
1266  * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1267  * page from the given size
1268  * @substream: PCM substream
1269  * @ofs: byte offset
1270  * @size: byte size to examine
1271  */
1272 static inline unsigned int
1273 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1274                              unsigned int ofs, unsigned int size)
1275 {
1276         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1277 }
1278 
1279 /**
1280  * snd_pcm_mmap_data_open - increase the mmap counter
1281  * @area: VMA
1282  *
1283  * PCM mmap callback should handle this counter properly
1284  */
1285 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1286 {
1287         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1288         atomic_inc(&substream->mmap_count);
1289 }
1290 
1291 /**
1292  * snd_pcm_mmap_data_close - decrease the mmap counter
1293  * @area: VMA
1294  *
1295  * PCM mmap callback should handle this counter properly
1296  */
1297 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1298 {
1299         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1300         atomic_dec(&substream->mmap_count);
1301 }
1302 
1303 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1304                              struct vm_area_struct *area);
1305 /* mmap for io-memory area */
1306 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1307 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1308 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1309 #else
1310 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1311 #define snd_pcm_lib_mmap_iomem  NULL
1312 #endif
1313 
1314 #define snd_pcm_lib_mmap_vmalloc NULL
1315 
1316 /**
1317  * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1318  * @dma: DMA number
1319  * @max: pointer to store the max size
1320  */
1321 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1322 {
1323         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1324 }
1325 
1326 /*
1327  *  Misc
1328  */
1329 
1330 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1331                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1332                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1333                                          (IEC958_AES3_CON_FS_48000<<24))
1334 
1335 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1336 
1337 const char *snd_pcm_format_name(snd_pcm_format_t format);
1338 
1339 /**
1340  * snd_pcm_stream_str - Get a string naming the direction of a stream
1341  * @substream: the pcm substream instance
1342  *
1343  * Return: A string naming the direction of the stream.
1344  */
1345 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1346 {
1347         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1348                 return "Playback";
1349         else
1350                 return "Capture";
1351 }
1352 
1353 /*
1354  * PCM channel-mapping control API
1355  */
1356 /* array element of channel maps */
1357 struct snd_pcm_chmap_elem {
1358         unsigned char channels;
1359         unsigned char map[15];
1360 };
1361 
1362 /* channel map information; retrieved via snd_kcontrol_chip() */
1363 struct snd_pcm_chmap {
1364         struct snd_pcm *pcm;    /* assigned PCM instance */
1365         int stream;             /* PLAYBACK or CAPTURE */
1366         struct snd_kcontrol *kctl;
1367         const struct snd_pcm_chmap_elem *chmap;
1368         unsigned int max_channels;
1369         unsigned int channel_mask;      /* optional: active channels bitmask */
1370         void *private_data;     /* optional: private data pointer */
1371 };
1372 
1373 /**
1374  * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1375  * @info: chmap information
1376  * @idx: the substream number index
1377  */
1378 static inline struct snd_pcm_substream *
1379 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1380 {
1381         struct snd_pcm_substream *s;
1382         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1383                 if (s->number == idx)
1384                         return s;
1385         return NULL;
1386 }
1387 
1388 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1389 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1390 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1391 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1392 
1393 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1394 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1395 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1396 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1397 
1398 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1399                            const struct snd_pcm_chmap_elem *chmap,
1400                            int max_channels,
1401                            unsigned long private_value,
1402                            struct snd_pcm_chmap **info_ret);
1403 
1404 /**
1405  * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1406  * @pcm_format: PCM format
1407  */
1408 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1409 {
1410         return 1ULL << (__force int) pcm_format;
1411 }
1412 
1413 /* printk helpers */
1414 #define pcm_err(pcm, fmt, args...) \
1415         dev_err((pcm)->card->dev, fmt, ##args)
1416 #define pcm_warn(pcm, fmt, args...) \
1417         dev_warn((pcm)->card->dev, fmt, ##args)
1418 #define pcm_dbg(pcm, fmt, args...) \
1419         dev_dbg((pcm)->card->dev, fmt, ##args)
1420 
1421 #endif /* __SOUND_PCM_H */
1422 

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