sound: pcm: add vmalloc buffer helper functions
[linux-3.10.git] / include / sound / pcm.h
1 #ifndef __SOUND_PCM_H
2 #define __SOUND_PCM_H
3
4 /*
5  *  Digital Audio (PCM) abstract layer
6  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7  *                   Abramo Bagnara <abramo@alsa-project.org>
8  *
9  *
10  *   This program is free software; you can redistribute it and/or modify
11  *   it under the terms of the GNU General Public License as published by
12  *   the Free Software Foundation; either version 2 of the License, or
13  *   (at your option) any later version.
14  *
15  *   This program is distributed in the hope that it will be useful,
16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *   GNU General Public License for more details.
19  *
20  *   You should have received a copy of the GNU General Public License
21  *   along with this program; if not, write to the Free Software
22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23  *
24  */
25
26 #include <sound/asound.h>
27 #include <sound/memalloc.h>
28 #include <sound/minors.h>
29 #include <linux/poll.h>
30 #include <linux/mm.h>
31 #include <linux/bitops.h>
32
33 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
34 #define snd_pcm_chip(pcm) ((pcm)->private_data)
35
36 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
37 #include "pcm_oss.h"
38 #endif
39
40 /*
41  *  Hardware (lowlevel) section
42  */
43
44 struct snd_pcm_hardware {
45         unsigned int info;              /* SNDRV_PCM_INFO_* */
46         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
47         unsigned int rates;             /* SNDRV_PCM_RATE_* */
48         unsigned int rate_min;          /* min rate */
49         unsigned int rate_max;          /* max rate */
50         unsigned int channels_min;      /* min channels */
51         unsigned int channels_max;      /* max channels */
52         size_t buffer_bytes_max;        /* max buffer size */
53         size_t period_bytes_min;        /* min period size */
54         size_t period_bytes_max;        /* max period size */
55         unsigned int periods_min;       /* min # of periods */
56         unsigned int periods_max;       /* max # of periods */
57         size_t fifo_size;               /* fifo size in bytes */
58 };
59
60 struct snd_pcm_substream;
61
62 struct snd_pcm_ops {
63         int (*open)(struct snd_pcm_substream *substream);
64         int (*close)(struct snd_pcm_substream *substream);
65         int (*ioctl)(struct snd_pcm_substream * substream,
66                      unsigned int cmd, void *arg);
67         int (*hw_params)(struct snd_pcm_substream *substream,
68                          struct snd_pcm_hw_params *params);
69         int (*hw_free)(struct snd_pcm_substream *substream);
70         int (*prepare)(struct snd_pcm_substream *substream);
71         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
72         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
73         int (*copy)(struct snd_pcm_substream *substream, int channel,
74                     snd_pcm_uframes_t pos,
75                     void __user *buf, snd_pcm_uframes_t count);
76         int (*silence)(struct snd_pcm_substream *substream, int channel, 
77                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
78         struct page *(*page)(struct snd_pcm_substream *substream,
79                              unsigned long offset);
80         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
81         int (*ack)(struct snd_pcm_substream *substream);
82 };
83
84 /*
85  *
86  */
87
88 #if defined(CONFIG_SND_DYNAMIC_MINORS)
89 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
90 #else
91 #define SNDRV_PCM_DEVICES       8
92 #endif
93
94 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
95 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
96
97 #define SNDRV_PCM_IOCTL1_RESET          0
98 #define SNDRV_PCM_IOCTL1_INFO           1
99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
100 #define SNDRV_PCM_IOCTL1_GSTATE         3
101 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
102
103 #define SNDRV_PCM_TRIGGER_STOP          0
104 #define SNDRV_PCM_TRIGGER_START         1
105 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
106 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
107 #define SNDRV_PCM_TRIGGER_SUSPEND       5
108 #define SNDRV_PCM_TRIGGER_RESUME        6
109
110 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
111
112 /* If you change this don't forget to change rates[] table in pcm_native.c */
113 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
114 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
115 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
116 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
117 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
118 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
119 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
120 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
121 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
122 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
123 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
124 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
125 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
126
127 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
128 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
129
130 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
131                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
132                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
133 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
134 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
135                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
136 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
137                                          SNDRV_PCM_RATE_192000)
138 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
139 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
140 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
141 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
142 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
143 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
144 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
145 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
146 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
147 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
148 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
149 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
150 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
151 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
152 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
153 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
154 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
155 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
157 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
158 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
159 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
160 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
161 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
162 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
163 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
164 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
165 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
166 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
167 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
168 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
169 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
170 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
171 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
172 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
173 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
174 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
175 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
176
177 #ifdef SNDRV_LITTLE_ENDIAN
178 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
179 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
180 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
181 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
182 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
183 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
184 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
185 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
186 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
187 #endif
188 #ifdef SNDRV_BIG_ENDIAN
189 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
190 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
191 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
192 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
193 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
194 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
195 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
196 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
198 #endif
199
200 struct snd_pcm_file {
201         struct snd_pcm_substream *substream;
202         int no_compat_mmap;
203 };
204
205 struct snd_pcm_hw_rule;
206 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
207                                       struct snd_pcm_hw_rule *rule);
208
209 struct snd_pcm_hw_rule {
210         unsigned int cond;
211         snd_pcm_hw_rule_func_t func;
212         int var;
213         int deps[4];
214         void *private;
215 };
216
217 struct snd_pcm_hw_constraints {
218         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
219                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
220         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
221                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
222         unsigned int rules_num;
223         unsigned int rules_all;
224         struct snd_pcm_hw_rule *rules;
225 };
226
227 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
228                                             snd_pcm_hw_param_t var)
229 {
230         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
231 }
232
233 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
234                                                     snd_pcm_hw_param_t var)
235 {
236         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
237 }
238
239 struct snd_ratnum {
240         unsigned int num;
241         unsigned int den_min, den_max, den_step;
242 };
243
244 struct snd_ratden {
245         unsigned int num_min, num_max, num_step;
246         unsigned int den;
247 };
248
249 struct snd_pcm_hw_constraint_ratnums {
250         int nrats;
251         struct snd_ratnum *rats;
252 };
253
254 struct snd_pcm_hw_constraint_ratdens {
255         int nrats;
256         struct snd_ratden *rats;
257 };
258
259 struct snd_pcm_hw_constraint_list {
260         unsigned int count;
261         unsigned int *list;
262         unsigned int mask;
263 };
264
265 struct snd_pcm_runtime {
266         /* -- Status -- */
267         struct snd_pcm_substream *trigger_master;
268         struct timespec trigger_tstamp; /* trigger timestamp */
269         int overrange;
270         snd_pcm_uframes_t avail_max;
271         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
272         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
273         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
274         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
275
276         /* -- HW params -- */
277         snd_pcm_access_t access;        /* access mode */
278         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
279         snd_pcm_subformat_t subformat;  /* subformat */
280         unsigned int rate;              /* rate in Hz */
281         unsigned int channels;          /* channels */
282         snd_pcm_uframes_t period_size;  /* period size */
283         unsigned int periods;           /* periods */
284         snd_pcm_uframes_t buffer_size;  /* buffer size */
285         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
286         size_t byte_align;
287         unsigned int frame_bits;
288         unsigned int sample_bits;
289         unsigned int info;
290         unsigned int rate_num;
291         unsigned int rate_den;
292
293         /* -- SW params -- */
294         int tstamp_mode;                /* mmap timestamp is updated */
295         unsigned int period_step;
296         snd_pcm_uframes_t start_threshold;
297         snd_pcm_uframes_t stop_threshold;
298         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
299                                                 noise is nearest than this */
300         snd_pcm_uframes_t silence_size; /* Silence filling size */
301         snd_pcm_uframes_t boundary;     /* pointers wrap point */
302
303         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
304         snd_pcm_uframes_t silence_filled; /* size filled with silence */
305
306         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
307
308         /* -- mmap -- */
309         struct snd_pcm_mmap_status *status;
310         struct snd_pcm_mmap_control *control;
311
312         /* -- locking / scheduling -- */
313         wait_queue_head_t sleep;
314         struct fasync_struct *fasync;
315
316         /* -- private section -- */
317         void *private_data;
318         void (*private_free)(struct snd_pcm_runtime *runtime);
319
320         /* -- hardware description -- */
321         struct snd_pcm_hardware hw;
322         struct snd_pcm_hw_constraints hw_constraints;
323
324         /* -- interrupt callbacks -- */
325         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
326         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
327
328         /* -- timer -- */
329         unsigned int timer_resolution;  /* timer resolution */
330         int tstamp_type;                /* timestamp type */
331
332         /* -- DMA -- */           
333         unsigned char *dma_area;        /* DMA area */
334         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
335         size_t dma_bytes;               /* size of DMA area */
336
337         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
338
339 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
340         /* -- OSS things -- */
341         struct snd_pcm_oss_runtime oss;
342 #endif
343 };
344
345 struct snd_pcm_group {          /* keep linked substreams */
346         spinlock_t lock;
347         struct list_head substreams;
348         int count;
349 };
350
351 struct pid;
352
353 struct snd_pcm_substream {
354         struct snd_pcm *pcm;
355         struct snd_pcm_str *pstr;
356         void *private_data;             /* copied from pcm->private_data */
357         int number;
358         char name[32];                  /* substream name */
359         int stream;                     /* stream (direction) */
360         char latency_id[20];            /* latency identifier */
361         size_t buffer_bytes_max;        /* limit ring buffer size */
362         struct snd_dma_buffer dma_buffer;
363         unsigned int dma_buf_id;
364         size_t dma_max;
365         /* -- hardware operations -- */
366         struct snd_pcm_ops *ops;
367         /* -- runtime information -- */
368         struct snd_pcm_runtime *runtime;
369         /* -- timer section -- */
370         struct snd_timer *timer;                /* timer */
371         unsigned timer_running: 1;      /* time is running */
372         /* -- next substream -- */
373         struct snd_pcm_substream *next;
374         /* -- linked substreams -- */
375         struct list_head link_list;     /* linked list member */
376         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
377         struct snd_pcm_group *group;            /* pointer to current group */
378         /* -- assigned files -- */
379         void *file;
380         int ref_count;
381         atomic_t mmap_count;
382         unsigned int f_flags;
383         void (*pcm_release)(struct snd_pcm_substream *);
384         struct pid *pid;
385 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
386         /* -- OSS things -- */
387         struct snd_pcm_oss_substream oss;
388 #endif
389 #ifdef CONFIG_SND_VERBOSE_PROCFS
390         struct snd_info_entry *proc_root;
391         struct snd_info_entry *proc_info_entry;
392         struct snd_info_entry *proc_hw_params_entry;
393         struct snd_info_entry *proc_sw_params_entry;
394         struct snd_info_entry *proc_status_entry;
395         struct snd_info_entry *proc_prealloc_entry;
396         struct snd_info_entry *proc_prealloc_max_entry;
397 #endif
398         /* misc flags */
399         unsigned int hw_opened: 1;
400 };
401
402 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
403
404
405 struct snd_pcm_str {
406         int stream;                             /* stream (direction) */
407         struct snd_pcm *pcm;
408         /* -- substreams -- */
409         unsigned int substream_count;
410         unsigned int substream_opened;
411         struct snd_pcm_substream *substream;
412 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
413         /* -- OSS things -- */
414         struct snd_pcm_oss_stream oss;
415 #endif
416 #ifdef CONFIG_SND_VERBOSE_PROCFS
417         struct snd_info_entry *proc_root;
418         struct snd_info_entry *proc_info_entry;
419 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
420         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
421         struct snd_info_entry *proc_xrun_debug_entry;
422 #endif
423 #endif
424 };
425
426 struct snd_pcm {
427         struct snd_card *card;
428         struct list_head list;
429         int device; /* device number */
430         unsigned int info_flags;
431         unsigned short dev_class;
432         unsigned short dev_subclass;
433         char id[64];
434         char name[80];
435         struct snd_pcm_str streams[2];
436         struct mutex open_mutex;
437         wait_queue_head_t open_wait;
438         void *private_data;
439         void (*private_free) (struct snd_pcm *pcm);
440         struct device *dev; /* actual hw device this belongs to */
441 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
442         struct snd_pcm_oss oss;
443 #endif
444 };
445
446 struct snd_pcm_notify {
447         int (*n_register) (struct snd_pcm * pcm);
448         int (*n_disconnect) (struct snd_pcm * pcm);
449         int (*n_unregister) (struct snd_pcm * pcm);
450         struct list_head list;
451 };
452
453 /*
454  *  Registering
455  */
456
457 extern const struct file_operations snd_pcm_f_ops[2];
458
459 int snd_pcm_new(struct snd_card *card, const char *id, int device,
460                 int playback_count, int capture_count,
461                 struct snd_pcm **rpcm);
462 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
463
464 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
465
466 /*
467  *  Native I/O
468  */
469
470 extern rwlock_t snd_pcm_link_rwlock;
471
472 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
473 int snd_pcm_info_user(struct snd_pcm_substream *substream,
474                       struct snd_pcm_info __user *info);
475 int snd_pcm_status(struct snd_pcm_substream *substream,
476                    struct snd_pcm_status *status);
477 int snd_pcm_start(struct snd_pcm_substream *substream);
478 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
479 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
480 #ifdef CONFIG_PM
481 int snd_pcm_suspend(struct snd_pcm_substream *substream);
482 int snd_pcm_suspend_all(struct snd_pcm *pcm);
483 #endif
484 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
485 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
486                            struct snd_pcm_substream **rsubstream);
487 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
488 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
489                              struct snd_pcm_substream **rsubstream);
490 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
491 void snd_pcm_vma_notify_data(void *client, void *data);
492 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
493
494 /*
495  *  PCM library
496  */
497
498 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
499 {
500         return substream->group != &substream->self_group;
501 }
502
503 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
504 {
505         read_lock(&snd_pcm_link_rwlock);
506         spin_lock(&substream->self_group.lock);
507 }
508
509 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
510 {
511         spin_unlock(&substream->self_group.lock);
512         read_unlock(&snd_pcm_link_rwlock);
513 }
514
515 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
516 {
517         read_lock_irq(&snd_pcm_link_rwlock);
518         spin_lock(&substream->self_group.lock);
519 }
520
521 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
522 {
523         spin_unlock(&substream->self_group.lock);
524         read_unlock_irq(&snd_pcm_link_rwlock);
525 }
526
527 #define snd_pcm_stream_lock_irqsave(substream, flags) \
528 do { \
529         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
530         spin_lock(&substream->self_group.lock); \
531 } while (0)
532
533 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
534 do { \
535         spin_unlock(&substream->self_group.lock); \
536         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
537 } while (0)
538
539 #define snd_pcm_group_for_each_entry(s, substream) \
540         list_for_each_entry(s, &substream->group->substreams, link_list)
541
542 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
543 {
544         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
545                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
546                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
547 }
548
549 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
550 {
551         return size * 8 / runtime->sample_bits;
552 }
553
554 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
555 {
556         return size * 8 / runtime->frame_bits;
557 }
558
559 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
560 {
561         return size * runtime->sample_bits / 8;
562 }
563
564 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
565 {
566         return size * runtime->frame_bits / 8;
567 }
568
569 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
570 {
571         return bytes % runtime->byte_align == 0;
572 }
573
574 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
575 {
576         struct snd_pcm_runtime *runtime = substream->runtime;
577         return frames_to_bytes(runtime, runtime->buffer_size);
578 }
579
580 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
581 {
582         struct snd_pcm_runtime *runtime = substream->runtime;
583         return frames_to_bytes(runtime, runtime->period_size);
584 }
585
586 /*
587  *  result is: 0 ... (boundary - 1)
588  */
589 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
590 {
591         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
592         if (avail < 0)
593                 avail += runtime->boundary;
594         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
595                 avail -= runtime->boundary;
596         return avail;
597 }
598
599 /*
600  *  result is: 0 ... (boundary - 1)
601  */
602 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
603 {
604         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
605         if (avail < 0)
606                 avail += runtime->boundary;
607         return avail;
608 }
609
610 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
611 {
612         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
613 }
614
615 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
616 {
617         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
618 }
619
620 /**
621  * snd_pcm_playback_ready - check whether the playback buffer is available
622  * @substream: the pcm substream instance
623  *
624  * Checks whether enough free space is available on the playback buffer.
625  *
626  * Returns non-zero if available, or zero if not.
627  */
628 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
629 {
630         struct snd_pcm_runtime *runtime = substream->runtime;
631         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
632 }
633
634 /**
635  * snd_pcm_capture_ready - check whether the capture buffer is available
636  * @substream: the pcm substream instance
637  *
638  * Checks whether enough capture data is available on the capture buffer.
639  *
640  * Returns non-zero if available, or zero if not.
641  */
642 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
643 {
644         struct snd_pcm_runtime *runtime = substream->runtime;
645         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
646 }
647
648 /**
649  * snd_pcm_playback_data - check whether any data exists on the playback buffer
650  * @substream: the pcm substream instance
651  *
652  * Checks whether any data exists on the playback buffer. If stop_threshold
653  * is bigger or equal to boundary, then this function returns always non-zero.
654  *
655  * Returns non-zero if exists, or zero if not.
656  */
657 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
658 {
659         struct snd_pcm_runtime *runtime = substream->runtime;
660         
661         if (runtime->stop_threshold >= runtime->boundary)
662                 return 1;
663         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
664 }
665
666 /**
667  * snd_pcm_playback_empty - check whether the playback buffer is empty
668  * @substream: the pcm substream instance
669  *
670  * Checks whether the playback buffer is empty.
671  *
672  * Returns non-zero if empty, or zero if not.
673  */
674 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
675 {
676         struct snd_pcm_runtime *runtime = substream->runtime;
677         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
678 }
679
680 /**
681  * snd_pcm_capture_empty - check whether the capture buffer is empty
682  * @substream: the pcm substream instance
683  *
684  * Checks whether the capture buffer is empty.
685  *
686  * Returns non-zero if empty, or zero if not.
687  */
688 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
689 {
690         struct snd_pcm_runtime *runtime = substream->runtime;
691         return snd_pcm_capture_avail(runtime) == 0;
692 }
693
694 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
695                                         struct snd_pcm_substream *master)
696 {
697         substream->runtime->trigger_master = master;
698 }
699
700 static inline int hw_is_mask(int var)
701 {
702         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
703                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
704 }
705
706 static inline int hw_is_interval(int var)
707 {
708         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
709                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
710 }
711
712 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
713                                      snd_pcm_hw_param_t var)
714 {
715         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
716 }
717
718 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
719                                              snd_pcm_hw_param_t var)
720 {
721         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
722 }
723
724 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
725                                              snd_pcm_hw_param_t var)
726 {
727         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
728 }
729
730 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
731                                                      snd_pcm_hw_param_t var)
732 {
733         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
734 }
735
736 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
737 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
738 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
739 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
740 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
741 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
742 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
743 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
744 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
745 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
746
747
748 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
749 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
750 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
751 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
752                           unsigned int k, struct snd_interval *c);
753 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
754                           const struct snd_interval *b, struct snd_interval *c);
755 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
756 int snd_interval_ratnum(struct snd_interval *i,
757                         unsigned int rats_count, struct snd_ratnum *rats,
758                         unsigned int *nump, unsigned int *denp);
759
760 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
761 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
762 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
763
764 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
765
766 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
767 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
768
769 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
770                                u_int32_t mask);
771 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
772                                  u_int64_t mask);
773 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
774                                  unsigned int min, unsigned int max);
775 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
776 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
777                                unsigned int cond,
778                                snd_pcm_hw_param_t var,
779                                struct snd_pcm_hw_constraint_list *l);
780 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
781                                   unsigned int cond,
782                                   snd_pcm_hw_param_t var,
783                                   struct snd_pcm_hw_constraint_ratnums *r);
784 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
785                                   unsigned int cond,
786                                   snd_pcm_hw_param_t var,
787                                   struct snd_pcm_hw_constraint_ratdens *r);
788 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
789                                  unsigned int cond,
790                                  unsigned int width,
791                                  unsigned int msbits);
792 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
793                                unsigned int cond,
794                                snd_pcm_hw_param_t var,
795                                unsigned long step);
796 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
797                                unsigned int cond,
798                                snd_pcm_hw_param_t var);
799 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
800                         unsigned int cond,
801                         int var,
802                         snd_pcm_hw_rule_func_t func, void *private,
803                         int dep, ...);
804
805 int snd_pcm_format_signed(snd_pcm_format_t format);
806 int snd_pcm_format_unsigned(snd_pcm_format_t format);
807 int snd_pcm_format_linear(snd_pcm_format_t format);
808 int snd_pcm_format_little_endian(snd_pcm_format_t format);
809 int snd_pcm_format_big_endian(snd_pcm_format_t format);
810 #if 0 /* just for DocBook */
811 /**
812  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
813  * @format: the format to check
814  *
815  * Returns 1 if the given PCM format is CPU-endian, 0 if
816  * opposite, or a negative error code if endian not specified.
817  */
818 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
819 #endif /* DocBook */
820 #ifdef SNDRV_LITTLE_ENDIAN
821 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
822 #else
823 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
824 #endif
825 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
826 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
827 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
828 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
829 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
830 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
831
832 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
833 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
834 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
835 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
836                       unsigned int cmd, void *arg);                      
837 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
838 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
839 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
840 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
841 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
842 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
843 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
844 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
845                                     const void __user *buf,
846                                     snd_pcm_uframes_t frames);
847 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
848                                    void __user *buf, snd_pcm_uframes_t frames);
849 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
850                                      void __user **bufs, snd_pcm_uframes_t frames);
851 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
852                                     void __user **bufs, snd_pcm_uframes_t frames);
853
854 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
855
856 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
857 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
858
859 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
860                                               struct snd_dma_buffer *bufp)
861 {
862         struct snd_pcm_runtime *runtime = substream->runtime;
863         if (bufp) {
864                 runtime->dma_buffer_p = bufp;
865                 runtime->dma_area = bufp->area;
866                 runtime->dma_addr = bufp->addr;
867                 runtime->dma_bytes = bufp->bytes;
868         } else {
869                 runtime->dma_buffer_p = NULL;
870                 runtime->dma_area = NULL;
871                 runtime->dma_addr = 0;
872                 runtime->dma_bytes = 0;
873         }
874 }
875
876 /*
877  *  Timer interface
878  */
879
880 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
881 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
882 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
883
884 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
885                                    struct timespec *tv)
886 {
887         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
888                 do_posix_clock_monotonic_gettime(tv);
889         else
890                 getnstimeofday(tv);
891 }
892
893 /*
894  *  Memory
895  */
896
897 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
898 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
899 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
900                                   int type, struct device *data,
901                                   size_t size, size_t max);
902 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
903                                           int type, void *data,
904                                           size_t size, size_t max);
905 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
906 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
907
908 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
909                                       size_t size, gfp_t gfp_flags);
910 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
911 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
912                                           unsigned long offset);
913 #if 0 /* for kernel-doc */
914 /**
915  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
916  * @substream: the substream to allocate the buffer to
917  * @size: the requested buffer size, in bytes
918  *
919  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
920  * contiguous in kernel virtual space, but not in physical memory.  Use this
921  * if the buffer is accessed by kernel code but not by device DMA.
922  *
923  * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
924  * code.
925  */
926 static int snd_pcm_lib_alloc_vmalloc_buffer
927                         (struct snd_pcm_substream *substream, size_t size);
928 /**
929  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
930  * @substream: the substream to allocate the buffer to
931  * @size: the requested buffer size, in bytes
932  *
933  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
934  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
935  */
936 static int snd_pcm_lib_alloc_vmalloc_32_buffer
937                         (struct snd_pcm_substream *substream, size_t size);
938 #endif
939 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
940         _snd_pcm_lib_alloc_vmalloc_buffer \
941                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
942 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
943         _snd_pcm_lib_alloc_vmalloc_buffer \
944                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
945
946 #ifdef CONFIG_SND_DMA_SGBUF
947 /*
948  * SG-buffer handling
949  */
950 #define snd_pcm_substream_sgbuf(substream) \
951         ((substream)->runtime->dma_buffer_p->private_data)
952
953 static inline dma_addr_t
954 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
955 {
956         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
957         return snd_sgbuf_get_addr(sg, ofs);
958 }
959
960 static inline void *
961 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
962 {
963         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
964         return snd_sgbuf_get_ptr(sg, ofs);
965 }
966
967 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
968                                     unsigned long offset);
969 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
970                                           unsigned int ofs, unsigned int size);
971
972 #else /* !SND_DMA_SGBUF */
973 /*
974  * fake using a continuous buffer
975  */
976 static inline dma_addr_t
977 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
978 {
979         return substream->runtime->dma_addr + ofs;
980 }
981
982 static inline void *
983 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
984 {
985         return substream->runtime->dma_area + ofs;
986 }
987
988 #define snd_pcm_sgbuf_ops_page  NULL
989
990 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
991
992 #endif /* SND_DMA_SGBUF */
993
994 /* handle mmap counter - PCM mmap callback should handle this counter properly */
995 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
996 {
997         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
998         atomic_inc(&substream->mmap_count);
999 }
1000
1001 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1002 {
1003         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1004         atomic_dec(&substream->mmap_count);
1005 }
1006
1007 /* mmap for io-memory area */
1008 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1009 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1010 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1011 #else
1012 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1013 #define snd_pcm_lib_mmap_iomem  NULL
1014 #endif
1015
1016 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1017 {
1018         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1019 }
1020
1021 /*
1022  *  Misc
1023  */
1024
1025 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1026                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1027                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1028                                          (IEC958_AES3_CON_FS_48000<<24))
1029
1030 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1031
1032 const char *snd_pcm_format_name(snd_pcm_format_t format);
1033
1034 #endif /* __SOUND_PCM_H */