[ALSA] Clean up PCM codes (take 2)
[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@suse.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 <linux/poll.h>
29 #include <linux/bitops.h>
30
31 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
32 #define snd_pcm_chip(pcm) ((pcm)->private_data)
33
34 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
35 #include "pcm_oss.h"
36 #endif
37
38 /*
39  *  Hardware (lowlevel) section
40  */
41
42 struct snd_pcm_hardware {
43         unsigned int info;              /* SNDRV_PCM_INFO_* */
44         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
45         unsigned int rates;             /* SNDRV_PCM_RATE_* */
46         unsigned int rate_min;          /* min rate */
47         unsigned int rate_max;          /* max rate */
48         unsigned int channels_min;      /* min channels */
49         unsigned int channels_max;      /* max channels */
50         size_t buffer_bytes_max;        /* max buffer size */
51         size_t period_bytes_min;        /* min period size */
52         size_t period_bytes_max;        /* max period size */
53         unsigned int periods_min;       /* min # of periods */
54         unsigned int periods_max;       /* max # of periods */
55         size_t fifo_size;               /* fifo size in bytes */
56 };
57
58 struct snd_pcm_ops {
59         int (*open)(struct snd_pcm_substream *substream);
60         int (*close)(struct snd_pcm_substream *substream);
61         int (*ioctl)(struct snd_pcm_substream * substream,
62                      unsigned int cmd, void *arg);
63         int (*hw_params)(struct snd_pcm_substream *substream,
64                          struct snd_pcm_hw_params *params);
65         int (*hw_free)(struct snd_pcm_substream *substream);
66         int (*prepare)(struct snd_pcm_substream *substream);
67         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
68         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
69         int (*copy)(struct snd_pcm_substream *substream, int channel,
70                     snd_pcm_uframes_t pos,
71                     void __user *buf, snd_pcm_uframes_t count);
72         int (*silence)(struct snd_pcm_substream *substream, int channel, 
73                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
74         struct page *(*page)(struct snd_pcm_substream *substream,
75                              unsigned long offset);
76         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
77         int (*ack)(struct snd_pcm_substream *substream);
78 };
79
80 /*
81  *
82  */
83
84 #define SNDRV_PCM_DEVICES               8
85
86 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
87 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
88
89 #define SNDRV_PCM_IOCTL1_RESET          0
90 #define SNDRV_PCM_IOCTL1_INFO           1
91 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
92 #define SNDRV_PCM_IOCTL1_GSTATE         3
93
94 #define SNDRV_PCM_TRIGGER_STOP          0
95 #define SNDRV_PCM_TRIGGER_START         1
96 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
97 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
98 #define SNDRV_PCM_TRIGGER_SUSPEND       5
99 #define SNDRV_PCM_TRIGGER_RESUME        6
100
101 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
102
103 /* If you change this don't forget to change rates[] table in pcm_native.c */
104 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
105 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
106 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
107 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
108 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
109 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
110 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
111 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
112 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
113 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
114 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
115 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
116 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
117
118 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
119 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
120
121 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
122                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
123                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
124 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
125 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
126                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
127 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
128                                          SNDRV_PCM_RATE_192000)
129 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
130 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
131 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
132 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
133 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
134 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
135 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
136 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
137 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
138 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
139 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
140 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
141 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
142 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
143 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
144 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
145 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
146 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
147 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
148 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
149 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
150 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
151 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
152 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
153 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
154 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
155 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
156 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
157 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
158 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
159 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
160 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
161 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
162 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
163 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
164 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
165 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
166 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
167
168 #ifdef SNDRV_LITTLE_ENDIAN
169 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
170 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
171 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
172 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
173 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
174 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
175 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
176 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
177 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
178 #endif
179 #ifdef SNDRV_BIG_ENDIAN
180 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
181 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
182 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
183 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
184 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
185 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
186 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
187 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
188 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
189 #endif
190
191 struct snd_pcm_file {
192         struct snd_pcm_substream *substream;
193         struct snd_pcm_file *next;
194 };
195
196 struct snd_pcm_hw_rule;
197 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
198                                       struct snd_pcm_hw_rule *rule);
199
200 struct snd_pcm_hw_rule {
201         unsigned int cond;
202         snd_pcm_hw_rule_func_t func;
203         int var;
204         int deps[4];
205         void *private;
206 };
207
208 struct snd_pcm_hw_constraints {
209         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
210                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
211         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
212                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
213         unsigned int rules_num;
214         unsigned int rules_all;
215         struct snd_pcm_hw_rule *rules;
216 };
217
218 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
219                                             snd_pcm_hw_param_t var)
220 {
221         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
222 }
223
224 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
225                                                     snd_pcm_hw_param_t var)
226 {
227         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
228 }
229
230 struct snd_ratnum {
231         unsigned int num;
232         unsigned int den_min, den_max, den_step;
233 };
234
235 struct snd_ratden {
236         unsigned int num_min, num_max, num_step;
237         unsigned int den;
238 };
239
240 struct snd_pcm_hw_constraint_ratnums {
241         int nrats;
242         struct snd_ratnum *rats;
243 };
244
245 struct snd_pcm_hw_constraint_ratdens {
246         int nrats;
247         struct snd_ratden *rats;
248 };
249
250 struct snd_pcm_hw_constraint_list {
251         unsigned int count;
252         unsigned int *list;
253         unsigned int mask;
254 };
255
256 struct snd_pcm_runtime {
257         /* -- Status -- */
258         struct snd_pcm_substream *trigger_master;
259         struct timespec trigger_tstamp; /* trigger timestamp */
260         int overrange;
261         snd_pcm_uframes_t avail_max;
262         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
263         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
264
265         /* -- HW params -- */
266         snd_pcm_access_t access;        /* access mode */
267         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
268         snd_pcm_subformat_t subformat;  /* subformat */
269         unsigned int rate;              /* rate in Hz */
270         unsigned int channels;          /* channels */
271         snd_pcm_uframes_t period_size;  /* period size */
272         unsigned int periods;           /* periods */
273         snd_pcm_uframes_t buffer_size;  /* buffer size */
274         unsigned int tick_time;         /* tick time */
275         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
276         size_t byte_align;
277         unsigned int frame_bits;
278         unsigned int sample_bits;
279         unsigned int info;
280         unsigned int rate_num;
281         unsigned int rate_den;
282
283         /* -- SW params -- */
284         int tstamp_mode;                /* mmap timestamp is updated */
285         unsigned int period_step;
286         unsigned int sleep_min;         /* min ticks to sleep */
287         snd_pcm_uframes_t xfer_align;   /* xfer size need to be a multiple */
288         snd_pcm_uframes_t start_threshold;
289         snd_pcm_uframes_t stop_threshold;
290         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
291                                                 noise is nearest than this */
292         snd_pcm_uframes_t silence_size; /* Silence filling size */
293         snd_pcm_uframes_t boundary;     /* pointers wrap point */
294
295         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
296         snd_pcm_uframes_t silence_filled; /* size filled with silence */
297
298         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
299
300         /* -- mmap -- */
301         volatile struct snd_pcm_mmap_status *status;
302         volatile struct snd_pcm_mmap_control *control;
303         atomic_t mmap_count;
304
305         /* -- locking / scheduling -- */
306         wait_queue_head_t sleep;
307         struct timer_list tick_timer;
308         struct fasync_struct *fasync;
309
310         /* -- private section -- */
311         void *private_data;
312         void (*private_free)(struct snd_pcm_runtime *runtime);
313
314         /* -- hardware description -- */
315         struct snd_pcm_hardware hw;
316         struct snd_pcm_hw_constraints hw_constraints;
317
318         /* -- interrupt callbacks -- */
319         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
320         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
321
322         /* -- timer -- */
323         unsigned int timer_resolution;  /* timer resolution */
324
325         /* -- DMA -- */           
326         unsigned char *dma_area;        /* DMA area */
327         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
328         size_t dma_bytes;               /* size of DMA area */
329
330         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
331
332 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
333         /* -- OSS things -- */
334         struct snd_pcm_oss_runtime oss;
335 #endif
336 };
337
338 struct snd_pcm_group {          /* keep linked substreams */
339         spinlock_t lock;
340         struct list_head substreams;
341         int count;
342 };
343
344 struct snd_pcm_substream {
345         struct snd_pcm *pcm;
346         struct snd_pcm_str *pstr;
347         void *private_data;             /* copied from pcm->private_data */
348         int number;
349         char name[32];                  /* substream name */
350         int stream;                     /* stream (direction) */
351         size_t buffer_bytes_max;        /* limit ring buffer size */
352         struct snd_dma_buffer dma_buffer;
353         unsigned int dma_buf_id;
354         size_t dma_max;
355         /* -- hardware operations -- */
356         struct snd_pcm_ops *ops;
357         /* -- runtime information -- */
358         struct snd_pcm_runtime *runtime;
359         /* -- timer section -- */
360         struct snd_timer *timer;                /* timer */
361         unsigned timer_running: 1;      /* time is running */
362         spinlock_t timer_lock;
363         /* -- next substream -- */
364         struct snd_pcm_substream *next;
365         /* -- linked substreams -- */
366         struct list_head link_list;     /* linked list member */
367         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
368         struct snd_pcm_group *group;            /* pointer to current group */
369         /* -- assigned files -- */
370         struct snd_pcm_file *file;
371         struct file *ffile;
372         void (*pcm_release)(struct snd_pcm_substream *);
373 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
374         /* -- OSS things -- */
375         struct snd_pcm_oss_substream oss;
376 #endif
377         struct snd_info_entry *proc_root;
378         struct snd_info_entry *proc_info_entry;
379         struct snd_info_entry *proc_hw_params_entry;
380         struct snd_info_entry *proc_sw_params_entry;
381         struct snd_info_entry *proc_status_entry;
382         struct snd_info_entry *proc_prealloc_entry;
383         /* misc flags */
384         unsigned int no_mmap_ctrl: 1;
385         unsigned int hw_opened: 1;
386 };
387
388 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
389
390
391 struct snd_pcm_str {
392         int stream;                             /* stream (direction) */
393         struct snd_pcm *pcm;
394         /* -- substreams -- */
395         unsigned int substream_count;
396         unsigned int substream_opened;
397         struct snd_pcm_substream *substream;
398 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
399         /* -- OSS things -- */
400         struct snd_pcm_oss_stream oss;
401 #endif
402         struct snd_pcm_file *files;
403         struct snd_info_entry *proc_root;
404         struct snd_info_entry *proc_info_entry;
405 #ifdef CONFIG_SND_DEBUG
406         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
407         struct snd_info_entry *proc_xrun_debug_entry;
408 #endif
409 };
410
411 struct snd_pcm {
412         struct snd_card *card;
413         struct list_head list;
414         unsigned int device;    /* device number */
415         unsigned int info_flags;
416         unsigned short dev_class;
417         unsigned short dev_subclass;
418         char id[64];
419         char name[80];
420         struct snd_pcm_str streams[2];
421         struct mutex open_mutex;
422         wait_queue_head_t open_wait;
423         void *private_data;
424         void (*private_free) (struct snd_pcm *pcm);
425 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
426         struct snd_pcm_oss oss;
427 #endif
428 };
429
430 struct snd_pcm_notify {
431         int (*n_register) (struct snd_pcm * pcm);
432         int (*n_disconnect) (struct snd_pcm * pcm);
433         int (*n_unregister) (struct snd_pcm * pcm);
434         struct list_head list;
435 };
436
437 /*
438  *  Registering
439  */
440
441 extern struct file_operations snd_pcm_f_ops[2];
442
443 int snd_pcm_new(struct snd_card *card, char *id, int device,
444                 int playback_count, int capture_count,
445                 struct snd_pcm **rpcm);
446 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
447
448 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
449
450 /*
451  *  Native I/O
452  */
453
454 extern rwlock_t snd_pcm_link_rwlock;
455
456 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
457 int snd_pcm_info_user(struct snd_pcm_substream *substream,
458                       struct snd_pcm_info __user *info);
459 int snd_pcm_status(struct snd_pcm_substream *substream,
460                    struct snd_pcm_status *status);
461 int snd_pcm_start(struct snd_pcm_substream *substream);
462 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
463 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
464 #ifdef CONFIG_PM
465 int snd_pcm_suspend(struct snd_pcm_substream *substream);
466 int snd_pcm_suspend_all(struct snd_pcm *pcm);
467 #endif
468 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
469 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
470                            struct snd_pcm_substream **rsubstream);
471 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
472 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
473                              struct snd_pcm_substream **rsubstream);
474 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
475 void snd_pcm_vma_notify_data(void *client, void *data);
476 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
477
478 #if BITS_PER_LONG >= 64
479
480 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
481 {
482         *rem = *n % div;
483         *n /= div;
484 }
485
486 #elif defined(i386)
487
488 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
489 {
490         u_int32_t low, high;
491         low = *n & 0xffffffff;
492         high = *n >> 32;
493         if (high) {
494                 u_int32_t high1 = high % div;
495                 high /= div;
496                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
497                 *n = (u_int64_t)high << 32 | low;
498         } else {
499                 *n = low / div;
500                 *rem = low % div;
501         }
502 }
503 #else
504
505 static inline void divl(u_int32_t high, u_int32_t low,
506                         u_int32_t div,
507                         u_int32_t *q, u_int32_t *r)
508 {
509         u_int64_t n = (u_int64_t)high << 32 | low;
510         u_int64_t d = (u_int64_t)div << 31;
511         u_int32_t q1 = 0;
512         int c = 32;
513         while (n > 0xffffffffU) {
514                 q1 <<= 1;
515                 if (n >= d) {
516                         n -= d;
517                         q1 |= 1;
518                 }
519                 d >>= 1;
520                 c--;
521         }
522         q1 <<= c;
523         if (n) {
524                 low = n;
525                 *q = q1 | (low / div);
526                 *r = low % div;
527         } else {
528                 *r = 0;
529                 *q = q1;
530         }
531         return;
532 }
533
534 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
535 {
536         u_int32_t low, high;
537         low = *n & 0xffffffff;
538         high = *n >> 32;
539         if (high) {
540                 u_int32_t high1 = high % div;
541                 u_int32_t low1 = low;
542                 high /= div;
543                 divl(high1, low1, div, &low, rem);
544                 *n = (u_int64_t)high << 32 | low;
545         } else {
546                 *n = low / div;
547                 *rem = low % div;
548         }
549 }
550 #endif
551
552 /*
553  *  PCM library
554  */
555
556 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
557 {
558         return substream->group != &substream->self_group;
559 }
560
561 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
562 {
563         read_lock(&snd_pcm_link_rwlock);
564         spin_lock(&substream->self_group.lock);
565 }
566
567 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
568 {
569         spin_unlock(&substream->self_group.lock);
570         read_unlock(&snd_pcm_link_rwlock);
571 }
572
573 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
574 {
575         read_lock_irq(&snd_pcm_link_rwlock);
576         spin_lock(&substream->self_group.lock);
577 }
578
579 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
580 {
581         spin_unlock(&substream->self_group.lock);
582         read_unlock_irq(&snd_pcm_link_rwlock);
583 }
584
585 #define snd_pcm_stream_lock_irqsave(substream, flags) \
586 do { \
587         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
588         spin_lock(&substream->self_group.lock); \
589 } while (0)
590
591 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
592 do { \
593         spin_unlock(&substream->self_group.lock); \
594         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
595 } while (0)
596
597 #define snd_pcm_group_for_each(pos, substream) \
598         list_for_each(pos, &substream->group->substreams)
599
600 #define snd_pcm_group_substream_entry(pos) \
601         list_entry(pos, struct snd_pcm_substream, link_list)
602
603 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
604 {
605         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
607                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
608 }
609
610 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
611 {
612         return size * 8 / runtime->sample_bits;
613 }
614
615 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
616 {
617         return size * 8 / runtime->frame_bits;
618 }
619
620 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
621 {
622         return size * runtime->sample_bits / 8;
623 }
624
625 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
626 {
627         return size * runtime->frame_bits / 8;
628 }
629
630 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
631 {
632         return bytes % runtime->byte_align == 0;
633 }
634
635 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
636 {
637         struct snd_pcm_runtime *runtime = substream->runtime;
638         return frames_to_bytes(runtime, runtime->buffer_size);
639 }
640
641 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
642 {
643         struct snd_pcm_runtime *runtime = substream->runtime;
644         return frames_to_bytes(runtime, runtime->period_size);
645 }
646
647 /*
648  *  result is: 0 ... (boundary - 1)
649  */
650 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
651 {
652         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
653         if (avail < 0)
654                 avail += runtime->boundary;
655         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
656                 avail -= runtime->boundary;
657         return avail;
658 }
659
660 /*
661  *  result is: 0 ... (boundary - 1)
662  */
663 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
664 {
665         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
666         if (avail < 0)
667                 avail += runtime->boundary;
668         return avail;
669 }
670
671 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
672 {
673         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
674 }
675
676 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
677 {
678         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
679 }
680
681 /**
682  * snd_pcm_playback_ready - check whether the playback buffer is available
683  * @substream: the pcm substream instance
684  *
685  * Checks whether enough free space is available on the playback buffer.
686  *
687  * Returns non-zero if available, or zero if not.
688  */
689 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
690 {
691         struct snd_pcm_runtime *runtime = substream->runtime;
692         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
693 }
694
695 /**
696  * snd_pcm_capture_ready - check whether the capture buffer is available
697  * @substream: the pcm substream instance
698  *
699  * Checks whether enough capture data is available on the capture buffer.
700  *
701  * Returns non-zero if available, or zero if not.
702  */
703 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
704 {
705         struct snd_pcm_runtime *runtime = substream->runtime;
706         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
707 }
708
709 /**
710  * snd_pcm_playback_data - check whether any data exists on the playback buffer
711  * @substream: the pcm substream instance
712  *
713  * Checks whether any data exists on the playback buffer. If stop_threshold
714  * is bigger or equal to boundary, then this function returns always non-zero.
715  *
716  * Returns non-zero if exists, or zero if not.
717  */
718 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
719 {
720         struct snd_pcm_runtime *runtime = substream->runtime;
721         
722         if (runtime->stop_threshold >= runtime->boundary)
723                 return 1;
724         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
725 }
726
727 /**
728  * snd_pcm_playback_empty - check whether the playback buffer is empty
729  * @substream: the pcm substream instance
730  *
731  * Checks whether the playback buffer is empty.
732  *
733  * Returns non-zero if empty, or zero if not.
734  */
735 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
736 {
737         struct snd_pcm_runtime *runtime = substream->runtime;
738         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
739 }
740
741 /**
742  * snd_pcm_capture_empty - check whether the capture buffer is empty
743  * @substream: the pcm substream instance
744  *
745  * Checks whether the capture buffer is empty.
746  *
747  * Returns non-zero if empty, or zero if not.
748  */
749 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
750 {
751         struct snd_pcm_runtime *runtime = substream->runtime;
752         return snd_pcm_capture_avail(runtime) == 0;
753 }
754
755 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
756                                         struct snd_pcm_substream *master)
757 {
758         substream->runtime->trigger_master = master;
759 }
760
761 static inline int hw_is_mask(int var)
762 {
763         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
764                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
765 }
766
767 static inline int hw_is_interval(int var)
768 {
769         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
770                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
771 }
772
773 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
774                                      snd_pcm_hw_param_t var)
775 {
776         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
777 }
778
779 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
780                                              snd_pcm_hw_param_t var)
781 {
782         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
783 }
784
785 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
786                                              snd_pcm_hw_param_t var)
787 {
788         return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
789 }
790
791 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
792                                                      snd_pcm_hw_param_t var)
793 {
794         return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
795 }
796
797 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
798 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
799 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
800 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
801 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
802 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
803 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
804 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
805 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
806 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
807 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
808
809
810 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
811 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
812 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
813 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
814                           unsigned int k, struct snd_interval *c);
815 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
816                           const struct snd_interval *b, struct snd_interval *c);
817 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
818 int snd_interval_ratnum(struct snd_interval *i,
819                         unsigned int rats_count, struct snd_ratnum *rats,
820                         unsigned int *nump, unsigned int *denp);
821
822 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
823 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
824 int snd_pcm_hw_param_near(struct snd_pcm_substream *substream, 
825                           struct snd_pcm_hw_params *params,
826                           snd_pcm_hw_param_t var, 
827                           unsigned int val, int *dir);
828 int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
829                          struct snd_pcm_hw_params *params,
830                          snd_pcm_hw_param_t var,
831                          unsigned int val, int dir);
832 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
833
834 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
835
836 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
837 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
838
839 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
840                                u_int32_t mask);
841 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
842                                  u_int64_t mask);
843 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
844                                  unsigned int min, unsigned int max);
845 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
846 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
847                                unsigned int cond,
848                                snd_pcm_hw_param_t var,
849                                struct snd_pcm_hw_constraint_list *l);
850 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
851                                   unsigned int cond,
852                                   snd_pcm_hw_param_t var,
853                                   struct snd_pcm_hw_constraint_ratnums *r);
854 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
855                                   unsigned int cond,
856                                   snd_pcm_hw_param_t var,
857                                   struct snd_pcm_hw_constraint_ratdens *r);
858 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
859                                  unsigned int cond,
860                                  unsigned int width,
861                                  unsigned int msbits);
862 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
863                                unsigned int cond,
864                                snd_pcm_hw_param_t var,
865                                unsigned long step);
866 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
867                                unsigned int cond,
868                                snd_pcm_hw_param_t var);
869 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
870                         unsigned int cond,
871                         int var,
872                         snd_pcm_hw_rule_func_t func, void *private,
873                         int dep, ...);
874
875 int snd_pcm_format_signed(snd_pcm_format_t format);
876 int snd_pcm_format_unsigned(snd_pcm_format_t format);
877 int snd_pcm_format_linear(snd_pcm_format_t format);
878 int snd_pcm_format_little_endian(snd_pcm_format_t format);
879 int snd_pcm_format_big_endian(snd_pcm_format_t format);
880 #if 0 /* just for DocBook */
881 /**
882  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
883  * @format: the format to check
884  *
885  * Returns 1 if the given PCM format is CPU-endian, 0 if
886  * opposite, or a negative error code if endian not specified.
887  */
888 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
889 #endif /* DocBook */
890 #ifdef SNDRV_LITTLE_ENDIAN
891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
892 #else
893 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
894 #endif
895 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
896 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
897 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
898 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
899 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
900 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
901 const char *snd_pcm_format_name(snd_pcm_format_t format);
902
903 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
904 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
905 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
906 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
907                       unsigned int cmd, void *arg);                      
908 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
909 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
910 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
911 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
912 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
913 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
914 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
915 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
916 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
917 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
918 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
919                                     const void __user *buf,
920                                     snd_pcm_uframes_t frames);
921 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
922                                    void __user *buf, snd_pcm_uframes_t frames);
923 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
924                                      void __user **bufs, snd_pcm_uframes_t frames);
925 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
926                                     void __user **bufs, snd_pcm_uframes_t frames);
927
928 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
929
930 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
931                                               struct snd_dma_buffer *bufp)
932 {
933         struct snd_pcm_runtime *runtime = substream->runtime;
934         if (bufp) {
935                 runtime->dma_buffer_p = bufp;
936                 runtime->dma_area = bufp->area;
937                 runtime->dma_addr = bufp->addr;
938                 runtime->dma_bytes = bufp->bytes;
939         } else {
940                 runtime->dma_buffer_p = NULL;
941                 runtime->dma_area = NULL;
942                 runtime->dma_addr = 0;
943                 runtime->dma_bytes = 0;
944         }
945 }
946
947 /*
948  *  Timer interface
949  */
950
951 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
952 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
953 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
954
955 /*
956  *  Memory
957  */
958
959 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
960 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
961 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
962                                   int type, struct device *data,
963                                   size_t size, size_t max);
964 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
965                                           int type, void *data,
966                                           size_t size, size_t max);
967 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
968 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
969
970 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
971 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
972 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
973 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
974
975 /* handle mmap counter - PCM mmap callback should handle this counter properly */
976 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
977 {
978         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
979         atomic_inc(&substream->runtime->mmap_count);
980 }
981
982 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
983 {
984         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
985         atomic_dec(&substream->runtime->mmap_count);
986 }
987
988 /* mmap for io-memory area */
989 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
990 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
991 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
992 #else
993 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
994 #define snd_pcm_lib_mmap_iomem  NULL
995 #endif
996
997 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
998 {
999         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1000 }
1001
1002 /*
1003  *  Misc
1004  */
1005
1006 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1007                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1008                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1009                                          (IEC958_AES3_CON_FS_48000<<24))
1010
1011 #endif /* __SOUND_PCM_H */