[ALSA] Insert might_sleep() in snd_iprintf()
[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/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         void *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 #ifdef CONFIG_SND_VERBOSE_PROCFS
378         struct snd_info_entry *proc_root;
379         struct snd_info_entry *proc_info_entry;
380         struct snd_info_entry *proc_hw_params_entry;
381         struct snd_info_entry *proc_sw_params_entry;
382         struct snd_info_entry *proc_status_entry;
383         struct snd_info_entry *proc_prealloc_entry;
384 #endif
385         /* misc flags */
386         unsigned int no_mmap_ctrl: 1;
387         unsigned int hw_opened: 1;
388 };
389
390 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
391
392
393 struct snd_pcm_str {
394         int stream;                             /* stream (direction) */
395         struct snd_pcm *pcm;
396         /* -- substreams -- */
397         unsigned int substream_count;
398         unsigned int substream_opened;
399         struct snd_pcm_substream *substream;
400 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
401         /* -- OSS things -- */
402         struct snd_pcm_oss_stream oss;
403 #endif
404         struct snd_pcm_file *files;
405 #ifdef CONFIG_SND_VERBOSE_PROCFS
406         struct snd_info_entry *proc_root;
407         struct snd_info_entry *proc_info_entry;
408 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
409         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
410         struct snd_info_entry *proc_xrun_debug_entry;
411 #endif
412 #endif
413 };
414
415 struct snd_pcm {
416         struct snd_card *card;
417         struct list_head list;
418         unsigned int device;    /* device number */
419         unsigned int info_flags;
420         unsigned short dev_class;
421         unsigned short dev_subclass;
422         char id[64];
423         char name[80];
424         struct snd_pcm_str streams[2];
425         struct mutex open_mutex;
426         wait_queue_head_t open_wait;
427         void *private_data;
428         void (*private_free) (struct snd_pcm *pcm);
429 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
430         struct snd_pcm_oss oss;
431 #endif
432 };
433
434 struct snd_pcm_notify {
435         int (*n_register) (struct snd_pcm * pcm);
436         int (*n_disconnect) (struct snd_pcm * pcm);
437         int (*n_unregister) (struct snd_pcm * pcm);
438         struct list_head list;
439 };
440
441 /*
442  *  Registering
443  */
444
445 extern struct file_operations snd_pcm_f_ops[2];
446
447 int snd_pcm_new(struct snd_card *card, char *id, int device,
448                 int playback_count, int capture_count,
449                 struct snd_pcm **rpcm);
450 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
451
452 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
453
454 /*
455  *  Native I/O
456  */
457
458 extern rwlock_t snd_pcm_link_rwlock;
459
460 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
461 int snd_pcm_info_user(struct snd_pcm_substream *substream,
462                       struct snd_pcm_info __user *info);
463 int snd_pcm_status(struct snd_pcm_substream *substream,
464                    struct snd_pcm_status *status);
465 int snd_pcm_start(struct snd_pcm_substream *substream);
466 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
467 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
468 #ifdef CONFIG_PM
469 int snd_pcm_suspend(struct snd_pcm_substream *substream);
470 int snd_pcm_suspend_all(struct snd_pcm *pcm);
471 #endif
472 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
473 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
474                            struct snd_pcm_substream **rsubstream);
475 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
476 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
477                              struct snd_pcm_substream **rsubstream);
478 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
479 void snd_pcm_vma_notify_data(void *client, void *data);
480 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
481
482 #if BITS_PER_LONG >= 64
483
484 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
485 {
486         *rem = *n % div;
487         *n /= div;
488 }
489
490 #elif defined(i386)
491
492 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
493 {
494         u_int32_t low, high;
495         low = *n & 0xffffffff;
496         high = *n >> 32;
497         if (high) {
498                 u_int32_t high1 = high % div;
499                 high /= div;
500                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
501                 *n = (u_int64_t)high << 32 | low;
502         } else {
503                 *n = low / div;
504                 *rem = low % div;
505         }
506 }
507 #else
508
509 static inline void divl(u_int32_t high, u_int32_t low,
510                         u_int32_t div,
511                         u_int32_t *q, u_int32_t *r)
512 {
513         u_int64_t n = (u_int64_t)high << 32 | low;
514         u_int64_t d = (u_int64_t)div << 31;
515         u_int32_t q1 = 0;
516         int c = 32;
517         while (n > 0xffffffffU) {
518                 q1 <<= 1;
519                 if (n >= d) {
520                         n -= d;
521                         q1 |= 1;
522                 }
523                 d >>= 1;
524                 c--;
525         }
526         q1 <<= c;
527         if (n) {
528                 low = n;
529                 *q = q1 | (low / div);
530                 *r = low % div;
531         } else {
532                 *r = 0;
533                 *q = q1;
534         }
535         return;
536 }
537
538 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
539 {
540         u_int32_t low, high;
541         low = *n & 0xffffffff;
542         high = *n >> 32;
543         if (high) {
544                 u_int32_t high1 = high % div;
545                 u_int32_t low1 = low;
546                 high /= div;
547                 divl(high1, low1, div, &low, rem);
548                 *n = (u_int64_t)high << 32 | low;
549         } else {
550                 *n = low / div;
551                 *rem = low % div;
552         }
553 }
554 #endif
555
556 /*
557  *  PCM library
558  */
559
560 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
561 {
562         return substream->group != &substream->self_group;
563 }
564
565 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
566 {
567         read_lock(&snd_pcm_link_rwlock);
568         spin_lock(&substream->self_group.lock);
569 }
570
571 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
572 {
573         spin_unlock(&substream->self_group.lock);
574         read_unlock(&snd_pcm_link_rwlock);
575 }
576
577 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
578 {
579         read_lock_irq(&snd_pcm_link_rwlock);
580         spin_lock(&substream->self_group.lock);
581 }
582
583 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
584 {
585         spin_unlock(&substream->self_group.lock);
586         read_unlock_irq(&snd_pcm_link_rwlock);
587 }
588
589 #define snd_pcm_stream_lock_irqsave(substream, flags) \
590 do { \
591         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
592         spin_lock(&substream->self_group.lock); \
593 } while (0)
594
595 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
596 do { \
597         spin_unlock(&substream->self_group.lock); \
598         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
599 } while (0)
600
601 #define snd_pcm_group_for_each(pos, substream) \
602         list_for_each(pos, &substream->group->substreams)
603
604 #define snd_pcm_group_substream_entry(pos) \
605         list_entry(pos, struct snd_pcm_substream, link_list)
606
607 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
608 {
609         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
610                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
611                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
612 }
613
614 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
615 {
616         return size * 8 / runtime->sample_bits;
617 }
618
619 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
620 {
621         return size * 8 / runtime->frame_bits;
622 }
623
624 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
625 {
626         return size * runtime->sample_bits / 8;
627 }
628
629 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
630 {
631         return size * runtime->frame_bits / 8;
632 }
633
634 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
635 {
636         return bytes % runtime->byte_align == 0;
637 }
638
639 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
640 {
641         struct snd_pcm_runtime *runtime = substream->runtime;
642         return frames_to_bytes(runtime, runtime->buffer_size);
643 }
644
645 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
646 {
647         struct snd_pcm_runtime *runtime = substream->runtime;
648         return frames_to_bytes(runtime, runtime->period_size);
649 }
650
651 /*
652  *  result is: 0 ... (boundary - 1)
653  */
654 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
655 {
656         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
657         if (avail < 0)
658                 avail += runtime->boundary;
659         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
660                 avail -= runtime->boundary;
661         return avail;
662 }
663
664 /*
665  *  result is: 0 ... (boundary - 1)
666  */
667 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
668 {
669         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
670         if (avail < 0)
671                 avail += runtime->boundary;
672         return avail;
673 }
674
675 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
676 {
677         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
678 }
679
680 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
681 {
682         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
683 }
684
685 /**
686  * snd_pcm_playback_ready - check whether the playback buffer is available
687  * @substream: the pcm substream instance
688  *
689  * Checks whether enough free space is available on the playback buffer.
690  *
691  * Returns non-zero if available, or zero if not.
692  */
693 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
694 {
695         struct snd_pcm_runtime *runtime = substream->runtime;
696         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
697 }
698
699 /**
700  * snd_pcm_capture_ready - check whether the capture buffer is available
701  * @substream: the pcm substream instance
702  *
703  * Checks whether enough capture data is available on the capture buffer.
704  *
705  * Returns non-zero if available, or zero if not.
706  */
707 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
708 {
709         struct snd_pcm_runtime *runtime = substream->runtime;
710         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
711 }
712
713 /**
714  * snd_pcm_playback_data - check whether any data exists on the playback buffer
715  * @substream: the pcm substream instance
716  *
717  * Checks whether any data exists on the playback buffer. If stop_threshold
718  * is bigger or equal to boundary, then this function returns always non-zero.
719  *
720  * Returns non-zero if exists, or zero if not.
721  */
722 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
723 {
724         struct snd_pcm_runtime *runtime = substream->runtime;
725         
726         if (runtime->stop_threshold >= runtime->boundary)
727                 return 1;
728         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
729 }
730
731 /**
732  * snd_pcm_playback_empty - check whether the playback buffer is empty
733  * @substream: the pcm substream instance
734  *
735  * Checks whether the playback buffer is empty.
736  *
737  * Returns non-zero if empty, or zero if not.
738  */
739 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
740 {
741         struct snd_pcm_runtime *runtime = substream->runtime;
742         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
743 }
744
745 /**
746  * snd_pcm_capture_empty - check whether the capture buffer is empty
747  * @substream: the pcm substream instance
748  *
749  * Checks whether the capture buffer is empty.
750  *
751  * Returns non-zero if empty, or zero if not.
752  */
753 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
754 {
755         struct snd_pcm_runtime *runtime = substream->runtime;
756         return snd_pcm_capture_avail(runtime) == 0;
757 }
758
759 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
760                                         struct snd_pcm_substream *master)
761 {
762         substream->runtime->trigger_master = master;
763 }
764
765 static inline int hw_is_mask(int var)
766 {
767         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
768                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
769 }
770
771 static inline int hw_is_interval(int var)
772 {
773         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
774                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
775 }
776
777 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
778                                      snd_pcm_hw_param_t var)
779 {
780         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
781 }
782
783 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
784                                              snd_pcm_hw_param_t var)
785 {
786         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
787 }
788
789 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
790                                              snd_pcm_hw_param_t var)
791 {
792         return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
793 }
794
795 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
796                                                      snd_pcm_hw_param_t var)
797 {
798         return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
799 }
800
801 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
802 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
803 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
804 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
805 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
806 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
807 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
808 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
809 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
810 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
811 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
812
813
814 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
815 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
816 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
817 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
818                           unsigned int k, struct snd_interval *c);
819 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
820                           const struct snd_interval *b, struct snd_interval *c);
821 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
822 int snd_interval_ratnum(struct snd_interval *i,
823                         unsigned int rats_count, struct snd_ratnum *rats,
824                         unsigned int *nump, unsigned int *denp);
825
826 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
827 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
828 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
829
830 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
831
832 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
833 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
834
835 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
836                                u_int32_t mask);
837 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
838                                  u_int64_t mask);
839 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
840                                  unsigned int min, unsigned int max);
841 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
842 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
843                                unsigned int cond,
844                                snd_pcm_hw_param_t var,
845                                struct snd_pcm_hw_constraint_list *l);
846 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
847                                   unsigned int cond,
848                                   snd_pcm_hw_param_t var,
849                                   struct snd_pcm_hw_constraint_ratnums *r);
850 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
851                                   unsigned int cond,
852                                   snd_pcm_hw_param_t var,
853                                   struct snd_pcm_hw_constraint_ratdens *r);
854 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
855                                  unsigned int cond,
856                                  unsigned int width,
857                                  unsigned int msbits);
858 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
859                                unsigned int cond,
860                                snd_pcm_hw_param_t var,
861                                unsigned long step);
862 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
863                                unsigned int cond,
864                                snd_pcm_hw_param_t var);
865 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
866                         unsigned int cond,
867                         int var,
868                         snd_pcm_hw_rule_func_t func, void *private,
869                         int dep, ...);
870
871 int snd_pcm_format_signed(snd_pcm_format_t format);
872 int snd_pcm_format_unsigned(snd_pcm_format_t format);
873 int snd_pcm_format_linear(snd_pcm_format_t format);
874 int snd_pcm_format_little_endian(snd_pcm_format_t format);
875 int snd_pcm_format_big_endian(snd_pcm_format_t format);
876 #if 0 /* just for DocBook */
877 /**
878  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
879  * @format: the format to check
880  *
881  * Returns 1 if the given PCM format is CPU-endian, 0 if
882  * opposite, or a negative error code if endian not specified.
883  */
884 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
885 #endif /* DocBook */
886 #ifdef SNDRV_LITTLE_ENDIAN
887 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
888 #else
889 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
890 #endif
891 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
892 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
893 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
894 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
895 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
896 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
897
898 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
899 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
900 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
901 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
902                       unsigned int cmd, void *arg);                      
903 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
904 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
905 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
906 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
907 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
908 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
909 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
910 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
911 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
912 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
913 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
914                                     const void __user *buf,
915                                     snd_pcm_uframes_t frames);
916 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
917                                    void __user *buf, snd_pcm_uframes_t frames);
918 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
919                                      void __user **bufs, snd_pcm_uframes_t frames);
920 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
921                                     void __user **bufs, snd_pcm_uframes_t frames);
922
923 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
924
925 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
926                                               struct snd_dma_buffer *bufp)
927 {
928         struct snd_pcm_runtime *runtime = substream->runtime;
929         if (bufp) {
930                 runtime->dma_buffer_p = bufp;
931                 runtime->dma_area = bufp->area;
932                 runtime->dma_addr = bufp->addr;
933                 runtime->dma_bytes = bufp->bytes;
934         } else {
935                 runtime->dma_buffer_p = NULL;
936                 runtime->dma_area = NULL;
937                 runtime->dma_addr = 0;
938                 runtime->dma_bytes = 0;
939         }
940 }
941
942 /*
943  *  Timer interface
944  */
945
946 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
947 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
948 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
949
950 /*
951  *  Memory
952  */
953
954 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
955 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
956 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
957                                   int type, struct device *data,
958                                   size_t size, size_t max);
959 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
960                                           int type, void *data,
961                                           size_t size, size_t max);
962 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
963 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
964
965 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
966 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
967 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
968 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
969
970 /* handle mmap counter - PCM mmap callback should handle this counter properly */
971 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
972 {
973         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
974         atomic_inc(&substream->runtime->mmap_count);
975 }
976
977 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
978 {
979         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
980         atomic_dec(&substream->runtime->mmap_count);
981 }
982
983 /* mmap for io-memory area */
984 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
985 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
986 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
987 #else
988 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
989 #define snd_pcm_lib_mmap_iomem  NULL
990 #endif
991
992 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
993 {
994         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
995 }
996
997 /*
998  *  Misc
999  */
1000
1001 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1002                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1003                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1004                                          (IEC958_AES3_CON_FS_48000<<24))
1005
1006 #endif /* __SOUND_PCM_H */