016c41893b06b18715609baca38c0dc6406f0806
[linux-2.6.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/mm.h>
30 #include <linux/bitops.h>
31
32 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
33 #define snd_pcm_chip(pcm) ((pcm)->private_data)
34
35 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
36 #include "pcm_oss.h"
37 #endif
38
39 /*
40  *  Hardware (lowlevel) section
41  */
42
43 struct snd_pcm_hardware {
44         unsigned int info;              /* SNDRV_PCM_INFO_* */
45         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
46         unsigned int rates;             /* SNDRV_PCM_RATE_* */
47         unsigned int rate_min;          /* min rate */
48         unsigned int rate_max;          /* max rate */
49         unsigned int channels_min;      /* min channels */
50         unsigned int channels_max;      /* max channels */
51         size_t buffer_bytes_max;        /* max buffer size */
52         size_t period_bytes_min;        /* min period size */
53         size_t period_bytes_max;        /* max period size */
54         unsigned int periods_min;       /* min # of periods */
55         unsigned int periods_max;       /* max # of periods */
56         size_t fifo_size;               /* fifo size in bytes */
57 };
58
59 struct snd_pcm_ops {
60         int (*open)(struct snd_pcm_substream *substream);
61         int (*close)(struct snd_pcm_substream *substream);
62         int (*ioctl)(struct snd_pcm_substream * substream,
63                      unsigned int cmd, void *arg);
64         int (*hw_params)(struct snd_pcm_substream *substream,
65                          struct snd_pcm_hw_params *params);
66         int (*hw_free)(struct snd_pcm_substream *substream);
67         int (*prepare)(struct snd_pcm_substream *substream);
68         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
69         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
70         int (*copy)(struct snd_pcm_substream *substream, int channel,
71                     snd_pcm_uframes_t pos,
72                     void __user *buf, snd_pcm_uframes_t count);
73         int (*silence)(struct snd_pcm_substream *substream, int channel, 
74                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
75         struct page *(*page)(struct snd_pcm_substream *substream,
76                              unsigned long offset);
77         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
78         int (*ack)(struct snd_pcm_substream *substream);
79 };
80
81 /*
82  *
83  */
84
85 #define SNDRV_PCM_DEVICES               8
86
87 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
88 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
89
90 #define SNDRV_PCM_IOCTL1_RESET          0
91 #define SNDRV_PCM_IOCTL1_INFO           1
92 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
93 #define SNDRV_PCM_IOCTL1_GSTATE         3
94
95 #define SNDRV_PCM_TRIGGER_STOP          0
96 #define SNDRV_PCM_TRIGGER_START         1
97 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
98 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
99 #define SNDRV_PCM_TRIGGER_SUSPEND       5
100 #define SNDRV_PCM_TRIGGER_RESUME        6
101
102 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
103
104 /* If you change this don't forget to change rates[] table in pcm_native.c */
105 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
106 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
107 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
108 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
109 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
110 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
111 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
112 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
113 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
114 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
115 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
116 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
117 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
118
119 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
120 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
121
122 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
123                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
124                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
125 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
126 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
127                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
128 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
129                                          SNDRV_PCM_RATE_192000)
130 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
131 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
132 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
133 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
134 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
135 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
136 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
137 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
138 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
139 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
140 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
141 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
142 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
143 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
144 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
145 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
146 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
147 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
148 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
149 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
150 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
151 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
152 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
153 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
154 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
155 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
156 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
157 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
158 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
159 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
160 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
161 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
162 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
163 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
164 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
165 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
166 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
167 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
168
169 #ifdef SNDRV_LITTLE_ENDIAN
170 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
171 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
172 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
173 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
174 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
175 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
176 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
177 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
178 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
179 #endif
180 #ifdef SNDRV_BIG_ENDIAN
181 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
182 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
183 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
184 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
185 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
186 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
187 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
188 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
189 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
190 #endif
191
192 struct snd_pcm_file {
193         struct snd_pcm_substream *substream;
194         int no_compat_mmap;
195 };
196
197 struct snd_pcm_hw_rule;
198 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
199                                       struct snd_pcm_hw_rule *rule);
200
201 struct snd_pcm_hw_rule {
202         unsigned int cond;
203         snd_pcm_hw_rule_func_t func;
204         int var;
205         int deps[4];
206         void *private;
207 };
208
209 struct snd_pcm_hw_constraints {
210         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
211                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
212         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
213                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
214         unsigned int rules_num;
215         unsigned int rules_all;
216         struct snd_pcm_hw_rule *rules;
217 };
218
219 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
220                                             snd_pcm_hw_param_t var)
221 {
222         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
223 }
224
225 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
226                                                     snd_pcm_hw_param_t var)
227 {
228         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
229 }
230
231 struct snd_ratnum {
232         unsigned int num;
233         unsigned int den_min, den_max, den_step;
234 };
235
236 struct snd_ratden {
237         unsigned int num_min, num_max, num_step;
238         unsigned int den;
239 };
240
241 struct snd_pcm_hw_constraint_ratnums {
242         int nrats;
243         struct snd_ratnum *rats;
244 };
245
246 struct snd_pcm_hw_constraint_ratdens {
247         int nrats;
248         struct snd_ratden *rats;
249 };
250
251 struct snd_pcm_hw_constraint_list {
252         unsigned int count;
253         unsigned int *list;
254         unsigned int mask;
255 };
256
257 struct snd_pcm_runtime {
258         /* -- Status -- */
259         struct snd_pcm_substream *trigger_master;
260         struct timespec trigger_tstamp; /* trigger timestamp */
261         int overrange;
262         snd_pcm_uframes_t avail_max;
263         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
264         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
265
266         /* -- HW params -- */
267         snd_pcm_access_t access;        /* access mode */
268         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
269         snd_pcm_subformat_t subformat;  /* subformat */
270         unsigned int rate;              /* rate in Hz */
271         unsigned int channels;          /* channels */
272         snd_pcm_uframes_t period_size;  /* period size */
273         unsigned int periods;           /* periods */
274         snd_pcm_uframes_t buffer_size;  /* buffer size */
275         unsigned int tick_time;         /* tick time */
276         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
277         size_t byte_align;
278         unsigned int frame_bits;
279         unsigned int sample_bits;
280         unsigned int info;
281         unsigned int rate_num;
282         unsigned int rate_den;
283
284         /* -- SW params -- */
285         int tstamp_mode;                /* mmap timestamp is updated */
286         unsigned int period_step;
287         unsigned int sleep_min;         /* min ticks to sleep */
288         snd_pcm_uframes_t xfer_align;   /* xfer size need to be a multiple */
289         snd_pcm_uframes_t start_threshold;
290         snd_pcm_uframes_t stop_threshold;
291         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
292                                                 noise is nearest than this */
293         snd_pcm_uframes_t silence_size; /* Silence filling size */
294         snd_pcm_uframes_t boundary;     /* pointers wrap point */
295
296         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
297         snd_pcm_uframes_t silence_filled; /* size filled with silence */
298
299         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
300
301         /* -- mmap -- */
302         volatile struct snd_pcm_mmap_status *status;
303         volatile struct snd_pcm_mmap_control *control;
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         char latency_id[20];            /* latency identifier */
352         size_t buffer_bytes_max;        /* limit ring buffer size */
353         struct snd_dma_buffer dma_buffer;
354         unsigned int dma_buf_id;
355         size_t dma_max;
356         /* -- hardware operations -- */
357         struct snd_pcm_ops *ops;
358         /* -- runtime information -- */
359         struct snd_pcm_runtime *runtime;
360         /* -- timer section -- */
361         struct snd_timer *timer;                /* timer */
362         unsigned timer_running: 1;      /* time is running */
363         spinlock_t timer_lock;
364         /* -- next substream -- */
365         struct snd_pcm_substream *next;
366         /* -- linked substreams -- */
367         struct list_head link_list;     /* linked list member */
368         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
369         struct snd_pcm_group *group;            /* pointer to current group */
370         /* -- assigned files -- */
371         void *file;
372         int ref_count;
373         atomic_t mmap_count;
374         unsigned int f_flags;
375         void (*pcm_release)(struct snd_pcm_substream *);
376 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
377         /* -- OSS things -- */
378         struct snd_pcm_oss_substream oss;
379 #endif
380 #ifdef CONFIG_SND_VERBOSE_PROCFS
381         struct snd_info_entry *proc_root;
382         struct snd_info_entry *proc_info_entry;
383         struct snd_info_entry *proc_hw_params_entry;
384         struct snd_info_entry *proc_sw_params_entry;
385         struct snd_info_entry *proc_status_entry;
386         struct snd_info_entry *proc_prealloc_entry;
387 #endif
388         /* misc flags */
389         unsigned int hw_opened: 1;
390 };
391
392 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
393
394
395 struct snd_pcm_str {
396         int stream;                             /* stream (direction) */
397         struct snd_pcm *pcm;
398         /* -- substreams -- */
399         unsigned int substream_count;
400         unsigned int substream_opened;
401         struct snd_pcm_substream *substream;
402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
403         /* -- OSS things -- */
404         struct snd_pcm_oss_stream oss;
405 #endif
406 #ifdef CONFIG_SND_VERBOSE_PROCFS
407         struct snd_info_entry *proc_root;
408         struct snd_info_entry *proc_info_entry;
409 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
410         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
411         struct snd_info_entry *proc_xrun_debug_entry;
412 #endif
413 #endif
414 };
415
416 struct snd_pcm {
417         struct snd_card *card;
418         struct list_head list;
419         unsigned int device;    /* device number */
420         unsigned int info_flags;
421         unsigned short dev_class;
422         unsigned short dev_subclass;
423         char id[64];
424         char name[80];
425         struct snd_pcm_str streams[2];
426         struct mutex open_mutex;
427         wait_queue_head_t open_wait;
428         void *private_data;
429         void (*private_free) (struct snd_pcm *pcm);
430         struct device *dev; /* actual hw device this belongs to */
431 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
432         struct snd_pcm_oss oss;
433 #endif
434 };
435
436 struct snd_pcm_notify {
437         int (*n_register) (struct snd_pcm * pcm);
438         int (*n_disconnect) (struct snd_pcm * pcm);
439         int (*n_unregister) (struct snd_pcm * pcm);
440         struct list_head list;
441 };
442
443 /*
444  *  Registering
445  */
446
447 extern struct file_operations snd_pcm_f_ops[2];
448
449 int snd_pcm_new(struct snd_card *card, char *id, int device,
450                 int playback_count, int capture_count,
451                 struct snd_pcm **rpcm);
452 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
453
454 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
455
456 /*
457  *  Native I/O
458  */
459
460 extern rwlock_t snd_pcm_link_rwlock;
461
462 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
463 int snd_pcm_info_user(struct snd_pcm_substream *substream,
464                       struct snd_pcm_info __user *info);
465 int snd_pcm_status(struct snd_pcm_substream *substream,
466                    struct snd_pcm_status *status);
467 int snd_pcm_start(struct snd_pcm_substream *substream);
468 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
469 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
470 #ifdef CONFIG_PM
471 int snd_pcm_suspend(struct snd_pcm_substream *substream);
472 int snd_pcm_suspend_all(struct snd_pcm *pcm);
473 #endif
474 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
475 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
476                            struct snd_pcm_substream **rsubstream);
477 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
478 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
479                              struct snd_pcm_substream **rsubstream);
480 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
481 void snd_pcm_vma_notify_data(void *client, void *data);
482 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
483
484 #if BITS_PER_LONG >= 64
485
486 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
487 {
488         *rem = *n % div;
489         *n /= div;
490 }
491
492 #elif defined(i386)
493
494 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
495 {
496         u_int32_t low, high;
497         low = *n & 0xffffffff;
498         high = *n >> 32;
499         if (high) {
500                 u_int32_t high1 = high % div;
501                 high /= div;
502                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
503                 *n = (u_int64_t)high << 32 | low;
504         } else {
505                 *n = low / div;
506                 *rem = low % div;
507         }
508 }
509 #else
510
511 static inline void divl(u_int32_t high, u_int32_t low,
512                         u_int32_t div,
513                         u_int32_t *q, u_int32_t *r)
514 {
515         u_int64_t n = (u_int64_t)high << 32 | low;
516         u_int64_t d = (u_int64_t)div << 31;
517         u_int32_t q1 = 0;
518         int c = 32;
519         while (n > 0xffffffffU) {
520                 q1 <<= 1;
521                 if (n >= d) {
522                         n -= d;
523                         q1 |= 1;
524                 }
525                 d >>= 1;
526                 c--;
527         }
528         q1 <<= c;
529         if (n) {
530                 low = n;
531                 *q = q1 | (low / div);
532                 *r = low % div;
533         } else {
534                 *r = 0;
535                 *q = q1;
536         }
537         return;
538 }
539
540 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
541 {
542         u_int32_t low, high;
543         low = *n & 0xffffffff;
544         high = *n >> 32;
545         if (high) {
546                 u_int32_t high1 = high % div;
547                 u_int32_t low1 = low;
548                 high /= div;
549                 divl(high1, low1, div, &low, rem);
550                 *n = (u_int64_t)high << 32 | low;
551         } else {
552                 *n = low / div;
553                 *rem = low % div;
554         }
555 }
556 #endif
557
558 /*
559  *  PCM library
560  */
561
562 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
563 {
564         return substream->group != &substream->self_group;
565 }
566
567 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
568 {
569         read_lock(&snd_pcm_link_rwlock);
570         spin_lock(&substream->self_group.lock);
571 }
572
573 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
574 {
575         spin_unlock(&substream->self_group.lock);
576         read_unlock(&snd_pcm_link_rwlock);
577 }
578
579 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
580 {
581         read_lock_irq(&snd_pcm_link_rwlock);
582         spin_lock(&substream->self_group.lock);
583 }
584
585 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
586 {
587         spin_unlock(&substream->self_group.lock);
588         read_unlock_irq(&snd_pcm_link_rwlock);
589 }
590
591 #define snd_pcm_stream_lock_irqsave(substream, flags) \
592 do { \
593         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
594         spin_lock(&substream->self_group.lock); \
595 } while (0)
596
597 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
598 do { \
599         spin_unlock(&substream->self_group.lock); \
600         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
601 } while (0)
602
603 #define snd_pcm_group_for_each(pos, substream) \
604         list_for_each(pos, &substream->group->substreams)
605
606 #define snd_pcm_group_substream_entry(pos) \
607         list_entry(pos, struct snd_pcm_substream, link_list)
608
609 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
610 {
611         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
612                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
613                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
614 }
615
616 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
617 {
618         return size * 8 / runtime->sample_bits;
619 }
620
621 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
622 {
623         return size * 8 / runtime->frame_bits;
624 }
625
626 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
627 {
628         return size * runtime->sample_bits / 8;
629 }
630
631 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
632 {
633         return size * runtime->frame_bits / 8;
634 }
635
636 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
637 {
638         return bytes % runtime->byte_align == 0;
639 }
640
641 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
642 {
643         struct snd_pcm_runtime *runtime = substream->runtime;
644         return frames_to_bytes(runtime, runtime->buffer_size);
645 }
646
647 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
648 {
649         struct snd_pcm_runtime *runtime = substream->runtime;
650         return frames_to_bytes(runtime, runtime->period_size);
651 }
652
653 /*
654  *  result is: 0 ... (boundary - 1)
655  */
656 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
657 {
658         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
659         if (avail < 0)
660                 avail += runtime->boundary;
661         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
662                 avail -= runtime->boundary;
663         return avail;
664 }
665
666 /*
667  *  result is: 0 ... (boundary - 1)
668  */
669 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
670 {
671         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
672         if (avail < 0)
673                 avail += runtime->boundary;
674         return avail;
675 }
676
677 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
678 {
679         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
680 }
681
682 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
683 {
684         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
685 }
686
687 /**
688  * snd_pcm_playback_ready - check whether the playback buffer is available
689  * @substream: the pcm substream instance
690  *
691  * Checks whether enough free space is available on the playback buffer.
692  *
693  * Returns non-zero if available, or zero if not.
694  */
695 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
696 {
697         struct snd_pcm_runtime *runtime = substream->runtime;
698         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
699 }
700
701 /**
702  * snd_pcm_capture_ready - check whether the capture buffer is available
703  * @substream: the pcm substream instance
704  *
705  * Checks whether enough capture data is available on the capture buffer.
706  *
707  * Returns non-zero if available, or zero if not.
708  */
709 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
710 {
711         struct snd_pcm_runtime *runtime = substream->runtime;
712         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
713 }
714
715 /**
716  * snd_pcm_playback_data - check whether any data exists on the playback buffer
717  * @substream: the pcm substream instance
718  *
719  * Checks whether any data exists on the playback buffer. If stop_threshold
720  * is bigger or equal to boundary, then this function returns always non-zero.
721  *
722  * Returns non-zero if exists, or zero if not.
723  */
724 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
725 {
726         struct snd_pcm_runtime *runtime = substream->runtime;
727         
728         if (runtime->stop_threshold >= runtime->boundary)
729                 return 1;
730         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
731 }
732
733 /**
734  * snd_pcm_playback_empty - check whether the playback buffer is empty
735  * @substream: the pcm substream instance
736  *
737  * Checks whether the playback buffer is empty.
738  *
739  * Returns non-zero if empty, or zero if not.
740  */
741 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
742 {
743         struct snd_pcm_runtime *runtime = substream->runtime;
744         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
745 }
746
747 /**
748  * snd_pcm_capture_empty - check whether the capture buffer is empty
749  * @substream: the pcm substream instance
750  *
751  * Checks whether the capture buffer is empty.
752  *
753  * Returns non-zero if empty, or zero if not.
754  */
755 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
756 {
757         struct snd_pcm_runtime *runtime = substream->runtime;
758         return snd_pcm_capture_avail(runtime) == 0;
759 }
760
761 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
762                                         struct snd_pcm_substream *master)
763 {
764         substream->runtime->trigger_master = master;
765 }
766
767 static inline int hw_is_mask(int var)
768 {
769         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
770                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
771 }
772
773 static inline int hw_is_interval(int var)
774 {
775         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
776                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
777 }
778
779 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
780                                      snd_pcm_hw_param_t var)
781 {
782         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
783 }
784
785 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
786                                              snd_pcm_hw_param_t var)
787 {
788         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
789 }
790
791 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
792                                              snd_pcm_hw_param_t var)
793 {
794         return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
795 }
796
797 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
798                                                      snd_pcm_hw_param_t var)
799 {
800         return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
801 }
802
803 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
804 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
805 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
806 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
807 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
808 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
809 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
810 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
811 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
812 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
813 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
814
815
816 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
817 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
818 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
819 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
820                           unsigned int k, struct snd_interval *c);
821 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
822                           const struct snd_interval *b, struct snd_interval *c);
823 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
824 int snd_interval_ratnum(struct snd_interval *i,
825                         unsigned int rats_count, struct snd_ratnum *rats,
826                         unsigned int *nump, unsigned int *denp);
827
828 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
829 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
830 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
831
832 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
833
834 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
835 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
836
837 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
838                                u_int32_t mask);
839 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
840                                  u_int64_t mask);
841 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
842                                  unsigned int min, unsigned int max);
843 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
844 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
845                                unsigned int cond,
846                                snd_pcm_hw_param_t var,
847                                struct snd_pcm_hw_constraint_list *l);
848 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
849                                   unsigned int cond,
850                                   snd_pcm_hw_param_t var,
851                                   struct snd_pcm_hw_constraint_ratnums *r);
852 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
853                                   unsigned int cond,
854                                   snd_pcm_hw_param_t var,
855                                   struct snd_pcm_hw_constraint_ratdens *r);
856 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
857                                  unsigned int cond,
858                                  unsigned int width,
859                                  unsigned int msbits);
860 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
861                                unsigned int cond,
862                                snd_pcm_hw_param_t var,
863                                unsigned long step);
864 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
865                                unsigned int cond,
866                                snd_pcm_hw_param_t var);
867 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
868                         unsigned int cond,
869                         int var,
870                         snd_pcm_hw_rule_func_t func, void *private,
871                         int dep, ...);
872
873 int snd_pcm_format_signed(snd_pcm_format_t format);
874 int snd_pcm_format_unsigned(snd_pcm_format_t format);
875 int snd_pcm_format_linear(snd_pcm_format_t format);
876 int snd_pcm_format_little_endian(snd_pcm_format_t format);
877 int snd_pcm_format_big_endian(snd_pcm_format_t format);
878 #if 0 /* just for DocBook */
879 /**
880  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
881  * @format: the format to check
882  *
883  * Returns 1 if the given PCM format is CPU-endian, 0 if
884  * opposite, or a negative error code if endian not specified.
885  */
886 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
887 #endif /* DocBook */
888 #ifdef SNDRV_LITTLE_ENDIAN
889 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
890 #else
891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
892 #endif
893 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
894 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
895 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
896 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
897 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
898 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
899
900 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
901 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
902 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
903 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
904                       unsigned int cmd, void *arg);                      
905 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
906 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
907 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
908 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
909 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
910 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
911 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
912 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
913 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
914 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
915 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
916                                     const void __user *buf,
917                                     snd_pcm_uframes_t frames);
918 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
919                                    void __user *buf, snd_pcm_uframes_t frames);
920 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
921                                      void __user **bufs, snd_pcm_uframes_t frames);
922 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
923                                     void __user **bufs, snd_pcm_uframes_t frames);
924
925 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
926
927 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
928                                               struct snd_dma_buffer *bufp)
929 {
930         struct snd_pcm_runtime *runtime = substream->runtime;
931         if (bufp) {
932                 runtime->dma_buffer_p = bufp;
933                 runtime->dma_area = bufp->area;
934                 runtime->dma_addr = bufp->addr;
935                 runtime->dma_bytes = bufp->bytes;
936         } else {
937                 runtime->dma_buffer_p = NULL;
938                 runtime->dma_area = NULL;
939                 runtime->dma_addr = 0;
940                 runtime->dma_bytes = 0;
941         }
942 }
943
944 /*
945  *  Timer interface
946  */
947
948 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
949 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
950 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
951
952 /*
953  *  Memory
954  */
955
956 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
957 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
958 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
959                                   int type, struct device *data,
960                                   size_t size, size_t max);
961 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
962                                           int type, void *data,
963                                           size_t size, size_t max);
964 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
965 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
966
967 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
968 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
969 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
970 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
971
972 /* handle mmap counter - PCM mmap callback should handle this counter properly */
973 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
974 {
975         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
976         atomic_inc(&substream->mmap_count);
977 }
978
979 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
980 {
981         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
982         atomic_dec(&substream->mmap_count);
983 }
984
985 /* mmap for io-memory area */
986 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
987 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
988 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
989 #else
990 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
991 #define snd_pcm_lib_mmap_iomem  NULL
992 #endif
993
994 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
995 {
996         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
997 }
998
999 /*
1000  *  Misc
1001  */
1002
1003 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1004                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1005                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1006                                          (IEC958_AES3_CON_FS_48000<<24))
1007
1008 #endif /* __SOUND_PCM_H */