blob: b546ac2660f9f64b8436e3efe836cfa0f298afee [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Digital Audio (PCM) abstract layer
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/slab.h>
24#include <linux/time.h>
Takashi Iwai3f7440a2009-06-05 17:40:04 +020025#include <linux/math64.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <sound/core.h>
27#include <sound/control.h>
28#include <sound/info.h>
29#include <sound/pcm.h>
30#include <sound/pcm_params.h>
31#include <sound/timer.h>
32
33/*
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
39 *
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 */
Takashi Iwai877211f2005-11-17 13:59:38 +010042void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Takashi Iwai877211f2005-11-17 13:59:38 +010044 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 snd_pcm_uframes_t frames, ofs, transfer;
46
47 if (runtime->silence_size < runtime->boundary) {
48 snd_pcm_sframes_t noise_dist, n;
49 if (runtime->silence_start != runtime->control->appl_ptr) {
50 n = runtime->control->appl_ptr - runtime->silence_start;
51 if (n < 0)
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
55 else
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
58 }
Takashi Iwai235475c2005-12-07 15:28:07 +010059 if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
63 return;
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 runtime->silence_filled = avail > 0 ? avail : 0;
71 runtime->silence_start = (runtime->status->hw_ptr +
72 runtime->silence_filled) %
73 runtime->boundary;
74 } else {
75 ofs = runtime->status->hw_ptr;
76 frames = new_hw_ptr - ofs;
77 if ((snd_pcm_sframes_t)frames < 0)
78 frames += runtime->boundary;
79 runtime->silence_filled -= frames;
80 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
81 runtime->silence_filled = 0;
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020082 runtime->silence_start = new_hw_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 } else {
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020084 runtime->silence_start = ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87 frames = runtime->buffer_size - runtime->silence_filled;
88 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +020089 if (snd_BUG_ON(frames > runtime->buffer_size))
90 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 if (frames == 0)
92 return;
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020093 ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 while (frames > 0) {
95 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
96 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
97 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
98 if (substream->ops->silence) {
99 int err;
100 err = substream->ops->silence(substream, -1, ofs, transfer);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200101 snd_BUG_ON(err < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 } else {
103 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
104 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
105 }
106 } else {
107 unsigned int c;
108 unsigned int channels = runtime->channels;
109 if (substream->ops->silence) {
110 for (c = 0; c < channels; ++c) {
111 int err;
112 err = substream->ops->silence(substream, c, ofs, transfer);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200113 snd_BUG_ON(err < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
115 } else {
116 size_t dma_csize = runtime->dma_bytes / channels;
117 for (c = 0; c < channels; ++c) {
118 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
119 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
120 }
121 }
122 }
123 runtime->silence_filled += transfer;
124 frames -= transfer;
125 ofs = 0;
126 }
127}
128
Takashi Iwaic0070112009-06-08 15:58:48 +0200129static void pcm_debug_name(struct snd_pcm_substream *substream,
130 char *name, size_t len)
131{
132 snprintf(name, len, "pcmC%dD%d%c:%d",
133 substream->pcm->card->number,
134 substream->pcm->device,
135 substream->stream ? 'c' : 'p',
136 substream->number);
137}
138
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100139#define XRUN_DEBUG_BASIC (1<<0)
140#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
142#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
143#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
144#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
145#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
146
147#ifdef CONFIG_SND_PCM_XRUN_DEBUG
148
149#define xrun_debug(substream, mask) \
150 ((substream)->pstr->xrun_debug & (mask))
151
152#define dump_stack_on_xrun(substream) do { \
153 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
154 dump_stack(); \
155 } while (0)
156
Takashi Iwai877211f2005-11-17 13:59:38 +0100157static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200159 struct snd_pcm_runtime *runtime = substream->runtime;
160
161 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
162 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
Jaroslav Kysela741b20c2009-12-17 17:34:39 +0100164 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
Takashi Iwaic0070112009-06-08 15:58:48 +0200165 char name[16];
166 pcm_debug_name(substream, name, sizeof(name));
167 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100168 dump_stack_on_xrun(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100172#define hw_ptr_error(substream, fmt, args...) \
173 do { \
174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100175 xrun_log_show(substream); \
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100176 if (printk_ratelimit()) { \
177 snd_printd("PCM: " fmt, ##args); \
178 } \
179 dump_stack_on_xrun(substream); \
180 } \
181 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100183#define XRUN_LOG_CNT 10
184
185struct hwptr_log_entry {
186 unsigned long jiffies;
187 snd_pcm_uframes_t pos;
188 snd_pcm_uframes_t period_size;
189 snd_pcm_uframes_t buffer_size;
190 snd_pcm_uframes_t old_hw_ptr;
191 snd_pcm_uframes_t hw_ptr_base;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100192};
193
194struct snd_pcm_hwptr_log {
195 unsigned int idx;
196 unsigned int hit: 1;
197 struct hwptr_log_entry entries[XRUN_LOG_CNT];
198};
199
200static void xrun_log(struct snd_pcm_substream *substream,
201 snd_pcm_uframes_t pos)
202{
203 struct snd_pcm_runtime *runtime = substream->runtime;
204 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
205 struct hwptr_log_entry *entry;
206
207 if (log == NULL) {
208 log = kzalloc(sizeof(*log), GFP_ATOMIC);
209 if (log == NULL)
210 return;
211 runtime->hwptr_log = log;
212 } else {
213 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
214 return;
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200215 }
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100216 entry = &log->entries[log->idx];
217 entry->jiffies = jiffies;
218 entry->pos = pos;
219 entry->period_size = runtime->period_size;
220 entry->buffer_size = runtime->buffer_size;;
221 entry->old_hw_ptr = runtime->status->hw_ptr;
222 entry->hw_ptr_base = runtime->hw_ptr_base;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100223 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100226static void xrun_log_show(struct snd_pcm_substream *substream)
227{
228 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
229 struct hwptr_log_entry *entry;
230 char name[16];
231 unsigned int idx;
232 int cnt;
233
234 if (log == NULL)
235 return;
236 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
237 return;
238 pcm_debug_name(substream, name, sizeof(name));
239 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
240 entry = &log->entries[idx];
241 if (entry->period_size == 0)
242 break;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100243 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
244 "hwptr=%ld/%ld\n",
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100245 name, entry->jiffies, (unsigned long)entry->pos,
246 (unsigned long)entry->period_size,
247 (unsigned long)entry->buffer_size,
248 (unsigned long)entry->old_hw_ptr,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100249 (unsigned long)entry->hw_ptr_base);
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100250 idx++;
251 idx %= XRUN_LOG_CNT;
252 }
253 log->hit = 1;
254}
255
256#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
257
258#define xrun_debug(substream, mask) 0
259#define xrun(substream) do { } while (0)
260#define hw_ptr_error(substream, fmt, args...) do { } while (0)
261#define xrun_log(substream, pos) do { } while (0)
262#define xrun_log_show(substream) do { } while (0)
263
264#endif
265
Jaroslav Kysela12509322010-01-07 15:36:31 +0100266int snd_pcm_update_state(struct snd_pcm_substream *substream,
267 struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
269 snd_pcm_uframes_t avail;
270
271 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
272 avail = snd_pcm_playback_avail(runtime);
273 else
274 avail = snd_pcm_capture_avail(runtime);
275 if (avail > runtime->avail_max)
276 runtime->avail_max = avail;
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200277 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
278 if (avail >= runtime->buffer_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 snd_pcm_drain_done(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200280 return -EPIPE;
281 }
282 } else {
283 if (avail >= runtime->stop_threshold) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 xrun(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200285 return -EPIPE;
286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
Jaroslav Kyselac91a9882010-01-21 10:32:15 +0100288 if (avail >= runtime->control->avail_min)
289 wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return 0;
291}
292
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100293static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
294 unsigned int in_interrupt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Takashi Iwai877211f2005-11-17 13:59:38 +0100296 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 snd_pcm_uframes_t pos;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100298 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200299 snd_pcm_sframes_t hdelta, delta;
300 unsigned long jdelta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200302 old_hw_ptr = runtime->status->hw_ptr;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100303 pos = substream->ops->pointer(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (pos == SNDRV_PCM_POS_XRUN) {
305 xrun(substream);
306 return -EPIPE;
307 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100308 if (pos >= runtime->buffer_size) {
309 if (printk_ratelimit()) {
310 char name[16];
311 pcm_debug_name(substream, name, sizeof(name));
312 xrun_log_show(substream);
313 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
314 "buffer size = %ld, period size = %ld\n",
315 name, pos, runtime->buffer_size,
316 runtime->period_size);
317 }
318 pos = 0;
Takashi Iwaicedb8112009-07-23 11:04:13 +0200319 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100320 pos -= pos % runtime->min_align;
321 if (xrun_debug(substream, XRUN_DEBUG_LOG))
322 xrun_log(substream, pos);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100323 hw_base = runtime->hw_ptr_base;
324 new_hw_ptr = hw_base + pos;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100325 if (in_interrupt) {
326 /* we know that one period was processed */
327 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
Jaroslav Kyselae7636922010-01-26 17:08:24 +0100328 delta = runtime->hw_ptr_interrupt + runtime->period_size;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100329 if (delta > new_hw_ptr) {
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100330 hw_base += runtime->buffer_size;
Takashi Iwai8b22d942009-03-20 16:26:15 +0100331 if (hw_base >= runtime->boundary)
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100332 hw_base = 0;
333 new_hw_ptr = hw_base + pos;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100334 goto __delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100337 /* new_hw_ptr might be lower than old_hw_ptr in case when */
338 /* pointer crosses the end of the ring buffer */
339 if (new_hw_ptr < old_hw_ptr) {
340 hw_base += runtime->buffer_size;
341 if (hw_base >= runtime->boundary)
342 hw_base = 0;
343 new_hw_ptr = hw_base + pos;
344 }
345 __delta:
346 delta = (new_hw_ptr - old_hw_ptr) % runtime->boundary;
347 if (xrun_debug(substream, in_interrupt ?
348 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
349 char name[16];
350 pcm_debug_name(substream, name, sizeof(name));
351 snd_printd("%s_update: %s: pos=%u/%u/%u, "
352 "hwptr=%ld/%ld/%ld/%ld\n",
353 in_interrupt ? "period" : "hwptr",
354 name,
355 (unsigned int)pos,
356 (unsigned int)runtime->period_size,
357 (unsigned int)runtime->buffer_size,
358 (unsigned long)delta,
359 (unsigned long)old_hw_ptr,
360 (unsigned long)new_hw_ptr,
361 (unsigned long)runtime->hw_ptr_base);
362 }
363 /* something must be really wrong */
Jaroslav Kysela7b3a1772010-01-08 08:43:01 +0100364 if (delta >= runtime->buffer_size + runtime->period_size) {
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100365 hw_ptr_error(substream,
366 "Unexpected hw_pointer value %s"
367 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
368 "old_hw_ptr=%ld)\n",
369 in_interrupt ? "[Q] " : "[P]",
370 substream->stream, (long)pos,
371 (long)new_hw_ptr, (long)old_hw_ptr);
372 return 0;
373 }
Takashi Iwaic87d9732009-05-27 10:53:33 +0200374
375 /* Do jiffies check only in xrun_debug mode */
Jaroslav Kysela741b20c2009-12-17 17:34:39 +0100376 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
Takashi Iwaic87d9732009-05-27 10:53:33 +0200377 goto no_jiffies_check;
378
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200379 /* Skip the jiffies check for hardwares with BATCH flag.
380 * Such hardware usually just increases the position at each IRQ,
381 * thus it can't give any strange position.
382 */
383 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
384 goto no_jiffies_check;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100385 hdelta = delta;
Jaroslav Kyselaa4444da2009-05-28 12:31:56 +0200386 if (hdelta < runtime->delay)
387 goto no_jiffies_check;
388 hdelta -= runtime->delay;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200389 jdelta = jiffies - runtime->hw_ptr_jiffies;
390 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
391 delta = jdelta /
392 (((runtime->period_size * HZ) / runtime->rate)
393 + HZ/100);
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100394 /* move new_hw_ptr according jiffies not pos variable */
395 new_hw_ptr = old_hw_ptr;
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100396 hw_base = delta;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100397 /* use loop to avoid checks for delta overflows */
398 /* the delta value is small or zero in most cases */
399 while (delta > 0) {
400 new_hw_ptr += runtime->period_size;
401 if (new_hw_ptr >= runtime->boundary)
402 new_hw_ptr -= runtime->boundary;
403 delta--;
404 }
405 /* align hw_base to buffer_size */
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200406 hw_ptr_error(substream,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100407 "hw_ptr skipping! %s"
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200408 "(pos=%ld, delta=%ld, period=%ld, "
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100409 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
410 in_interrupt ? "[Q] " : "",
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200411 (long)pos, (long)hdelta,
412 (long)runtime->period_size, jdelta,
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100413 ((hdelta * HZ) / runtime->rate), hw_base,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100414 (unsigned long)old_hw_ptr,
415 (unsigned long)new_hw_ptr);
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100416 /* reset values to proper state */
417 delta = 0;
418 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200419 }
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200420 no_jiffies_check:
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200421 if (delta > runtime->period_size + runtime->period_size / 2) {
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100422 hw_ptr_error(substream,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100423 "Lost interrupts? %s"
424 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
425 "old_hw_ptr=%ld)\n",
426 in_interrupt ? "[Q] " : "",
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100427 substream->stream, (long)delta,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100428 (long)new_hw_ptr,
429 (long)old_hw_ptr);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100430 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100431
432 if (runtime->status->hw_ptr == new_hw_ptr)
433 return 0;
Takashi Iwaiab1863f2009-06-07 12:09:17 +0200434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
436 runtime->silence_size > 0)
437 snd_pcm_playback_silence(substream, new_hw_ptr);
438
Jaroslav Kyselae7636922010-01-26 17:08:24 +0100439 if (in_interrupt) {
440 runtime->hw_ptr_interrupt = new_hw_ptr -
441 (new_hw_ptr % runtime->period_size);
442 }
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100443 runtime->hw_ptr_base = hw_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 runtime->status->hw_ptr = new_hw_ptr;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200445 runtime->hw_ptr_jiffies = jiffies;
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200446 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
447 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Jaroslav Kysela12509322010-01-07 15:36:31 +0100449 return snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
452/* CAUTION: call it with irq disabled */
Takashi Iwai877211f2005-11-17 13:59:38 +0100453int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100455 return snd_pcm_update_hw_ptr0(substream, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
458/**
459 * snd_pcm_set_ops - set the PCM operators
460 * @pcm: the pcm instance
461 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
462 * @ops: the operator table
463 *
464 * Sets the given PCM operators to the pcm instance.
465 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100466void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Takashi Iwai877211f2005-11-17 13:59:38 +0100468 struct snd_pcm_str *stream = &pcm->streams[direction];
469 struct snd_pcm_substream *substream;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471 for (substream = stream->substream; substream != NULL; substream = substream->next)
472 substream->ops = ops;
473}
474
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200475EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477/**
478 * snd_pcm_sync - set the PCM sync id
479 * @substream: the pcm substream
480 *
481 * Sets the PCM sync identifier for the card.
482 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100483void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
Takashi Iwai877211f2005-11-17 13:59:38 +0100485 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 runtime->sync.id32[0] = substream->pcm->card->number;
488 runtime->sync.id32[1] = -1;
489 runtime->sync.id32[2] = -1;
490 runtime->sync.id32[3] = -1;
491}
492
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200493EXPORT_SYMBOL(snd_pcm_set_sync);
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495/*
496 * Standard ioctl routine
497 */
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499static inline unsigned int div32(unsigned int a, unsigned int b,
500 unsigned int *r)
501{
502 if (b == 0) {
503 *r = 0;
504 return UINT_MAX;
505 }
506 *r = a % b;
507 return a / b;
508}
509
510static inline unsigned int div_down(unsigned int a, unsigned int b)
511{
512 if (b == 0)
513 return UINT_MAX;
514 return a / b;
515}
516
517static inline unsigned int div_up(unsigned int a, unsigned int b)
518{
519 unsigned int r;
520 unsigned int q;
521 if (b == 0)
522 return UINT_MAX;
523 q = div32(a, b, &r);
524 if (r)
525 ++q;
526 return q;
527}
528
529static inline unsigned int mul(unsigned int a, unsigned int b)
530{
531 if (a == 0)
532 return 0;
533 if (div_down(UINT_MAX, a) < b)
534 return UINT_MAX;
535 return a * b;
536}
537
538static inline unsigned int muldiv32(unsigned int a, unsigned int b,
539 unsigned int c, unsigned int *r)
540{
541 u_int64_t n = (u_int64_t) a * b;
542 if (c == 0) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200543 snd_BUG_ON(!n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 *r = 0;
545 return UINT_MAX;
546 }
Takashi Iwai3f7440a2009-06-05 17:40:04 +0200547 n = div_u64_rem(n, c, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (n >= UINT_MAX) {
549 *r = 0;
550 return UINT_MAX;
551 }
552 return n;
553}
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555/**
556 * snd_interval_refine - refine the interval value of configurator
557 * @i: the interval value to refine
558 * @v: the interval value to refer to
559 *
560 * Refines the interval value with the reference value.
561 * The interval is changed to the range satisfying both intervals.
562 * The interval status (min, max, integer, etc.) are evaluated.
563 *
564 * Returns non-zero if the value is changed, zero if not changed.
565 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100566int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
568 int changed = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200569 if (snd_BUG_ON(snd_interval_empty(i)))
570 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if (i->min < v->min) {
572 i->min = v->min;
573 i->openmin = v->openmin;
574 changed = 1;
575 } else if (i->min == v->min && !i->openmin && v->openmin) {
576 i->openmin = 1;
577 changed = 1;
578 }
579 if (i->max > v->max) {
580 i->max = v->max;
581 i->openmax = v->openmax;
582 changed = 1;
583 } else if (i->max == v->max && !i->openmax && v->openmax) {
584 i->openmax = 1;
585 changed = 1;
586 }
587 if (!i->integer && v->integer) {
588 i->integer = 1;
589 changed = 1;
590 }
591 if (i->integer) {
592 if (i->openmin) {
593 i->min++;
594 i->openmin = 0;
595 }
596 if (i->openmax) {
597 i->max--;
598 i->openmax = 0;
599 }
600 } else if (!i->openmin && !i->openmax && i->min == i->max)
601 i->integer = 1;
602 if (snd_interval_checkempty(i)) {
603 snd_interval_none(i);
604 return -EINVAL;
605 }
606 return changed;
607}
608
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200609EXPORT_SYMBOL(snd_interval_refine);
610
Takashi Iwai877211f2005-11-17 13:59:38 +0100611static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200613 if (snd_BUG_ON(snd_interval_empty(i)))
614 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if (snd_interval_single(i))
616 return 0;
617 i->max = i->min;
618 i->openmax = i->openmin;
619 if (i->openmax)
620 i->max++;
621 return 1;
622}
623
Takashi Iwai877211f2005-11-17 13:59:38 +0100624static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200626 if (snd_BUG_ON(snd_interval_empty(i)))
627 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 if (snd_interval_single(i))
629 return 0;
630 i->min = i->max;
631 i->openmin = i->openmax;
632 if (i->openmin)
633 i->min--;
634 return 1;
635}
636
Takashi Iwai877211f2005-11-17 13:59:38 +0100637void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 if (a->empty || b->empty) {
640 snd_interval_none(c);
641 return;
642 }
643 c->empty = 0;
644 c->min = mul(a->min, b->min);
645 c->openmin = (a->openmin || b->openmin);
646 c->max = mul(a->max, b->max);
647 c->openmax = (a->openmax || b->openmax);
648 c->integer = (a->integer && b->integer);
649}
650
651/**
652 * snd_interval_div - refine the interval value with division
Takashi Iwaidf8db932005-09-07 13:38:19 +0200653 * @a: dividend
654 * @b: divisor
655 * @c: quotient
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 *
657 * c = a / b
658 *
659 * Returns non-zero if the value is changed, zero if not changed.
660 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100661void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
663 unsigned int r;
664 if (a->empty || b->empty) {
665 snd_interval_none(c);
666 return;
667 }
668 c->empty = 0;
669 c->min = div32(a->min, b->max, &r);
670 c->openmin = (r || a->openmin || b->openmax);
671 if (b->min > 0) {
672 c->max = div32(a->max, b->min, &r);
673 if (r) {
674 c->max++;
675 c->openmax = 1;
676 } else
677 c->openmax = (a->openmax || b->openmin);
678 } else {
679 c->max = UINT_MAX;
680 c->openmax = 0;
681 }
682 c->integer = 0;
683}
684
685/**
686 * snd_interval_muldivk - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200687 * @a: dividend 1
688 * @b: dividend 2
689 * @k: divisor (as integer)
690 * @c: result
691 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 * c = a * b / k
693 *
694 * Returns non-zero if the value is changed, zero if not changed.
695 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100696void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
697 unsigned int k, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698{
699 unsigned int r;
700 if (a->empty || b->empty) {
701 snd_interval_none(c);
702 return;
703 }
704 c->empty = 0;
705 c->min = muldiv32(a->min, b->min, k, &r);
706 c->openmin = (r || a->openmin || b->openmin);
707 c->max = muldiv32(a->max, b->max, k, &r);
708 if (r) {
709 c->max++;
710 c->openmax = 1;
711 } else
712 c->openmax = (a->openmax || b->openmax);
713 c->integer = 0;
714}
715
716/**
717 * snd_interval_mulkdiv - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200718 * @a: dividend 1
719 * @k: dividend 2 (as integer)
720 * @b: divisor
721 * @c: result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 *
723 * c = a * k / b
724 *
725 * Returns non-zero if the value is changed, zero if not changed.
726 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100727void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
728 const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
730 unsigned int r;
731 if (a->empty || b->empty) {
732 snd_interval_none(c);
733 return;
734 }
735 c->empty = 0;
736 c->min = muldiv32(a->min, k, b->max, &r);
737 c->openmin = (r || a->openmin || b->openmax);
738 if (b->min > 0) {
739 c->max = muldiv32(a->max, k, b->min, &r);
740 if (r) {
741 c->max++;
742 c->openmax = 1;
743 } else
744 c->openmax = (a->openmax || b->openmin);
745 } else {
746 c->max = UINT_MAX;
747 c->openmax = 0;
748 }
749 c->integer = 0;
750}
751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752/* ---- */
753
754
755/**
756 * snd_interval_ratnum - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200757 * @i: interval to refine
758 * @rats_count: number of ratnum_t
759 * @rats: ratnum_t array
760 * @nump: pointer to store the resultant numerator
761 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 *
763 * Returns non-zero if the value is changed, zero if not changed.
764 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100765int snd_interval_ratnum(struct snd_interval *i,
766 unsigned int rats_count, struct snd_ratnum *rats,
767 unsigned int *nump, unsigned int *denp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Krzysztof Helt8374e242009-12-21 17:07:08 +0100769 unsigned int best_num, best_den;
770 int best_diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100772 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 int err;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100774 unsigned int result_num, result_den;
775 int result_diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777 best_num = best_den = best_diff = 0;
778 for (k = 0; k < rats_count; ++k) {
779 unsigned int num = rats[k].num;
780 unsigned int den;
781 unsigned int q = i->min;
782 int diff;
783 if (q == 0)
784 q = 1;
Krzysztof Helt40962d72009-12-19 18:31:04 +0100785 den = div_up(num, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 if (den < rats[k].den_min)
787 continue;
788 if (den > rats[k].den_max)
789 den = rats[k].den_max;
790 else {
791 unsigned int r;
792 r = (den - rats[k].den_min) % rats[k].den_step;
793 if (r != 0)
794 den -= r;
795 }
796 diff = num - q * den;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100797 if (diff < 0)
798 diff = -diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 if (best_num == 0 ||
800 diff * best_den < best_diff * den) {
801 best_diff = diff;
802 best_den = den;
803 best_num = num;
804 }
805 }
806 if (best_den == 0) {
807 i->empty = 1;
808 return -EINVAL;
809 }
810 t.min = div_down(best_num, best_den);
811 t.openmin = !!(best_num % best_den);
812
Krzysztof Helt8374e242009-12-21 17:07:08 +0100813 result_num = best_num;
814 result_diff = best_diff;
815 result_den = best_den;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 best_num = best_den = best_diff = 0;
817 for (k = 0; k < rats_count; ++k) {
818 unsigned int num = rats[k].num;
819 unsigned int den;
820 unsigned int q = i->max;
821 int diff;
822 if (q == 0) {
823 i->empty = 1;
824 return -EINVAL;
825 }
Krzysztof Helt40962d72009-12-19 18:31:04 +0100826 den = div_down(num, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (den > rats[k].den_max)
828 continue;
829 if (den < rats[k].den_min)
830 den = rats[k].den_min;
831 else {
832 unsigned int r;
833 r = (den - rats[k].den_min) % rats[k].den_step;
834 if (r != 0)
835 den += rats[k].den_step - r;
836 }
837 diff = q * den - num;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100838 if (diff < 0)
839 diff = -diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 if (best_num == 0 ||
841 diff * best_den < best_diff * den) {
842 best_diff = diff;
843 best_den = den;
844 best_num = num;
845 }
846 }
847 if (best_den == 0) {
848 i->empty = 1;
849 return -EINVAL;
850 }
851 t.max = div_up(best_num, best_den);
852 t.openmax = !!(best_num % best_den);
853 t.integer = 0;
854 err = snd_interval_refine(i, &t);
855 if (err < 0)
856 return err;
857
858 if (snd_interval_single(i)) {
Krzysztof Helt8374e242009-12-21 17:07:08 +0100859 if (best_diff * result_den < result_diff * best_den) {
860 result_num = best_num;
861 result_den = best_den;
862 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 if (nump)
Krzysztof Helt8374e242009-12-21 17:07:08 +0100864 *nump = result_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 if (denp)
Krzysztof Helt8374e242009-12-21 17:07:08 +0100866 *denp = result_den;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 }
868 return err;
869}
870
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200871EXPORT_SYMBOL(snd_interval_ratnum);
872
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873/**
874 * snd_interval_ratden - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200875 * @i: interval to refine
Takashi Iwai877211f2005-11-17 13:59:38 +0100876 * @rats_count: number of struct ratden
877 * @rats: struct ratden array
Takashi Iwaidf8db932005-09-07 13:38:19 +0200878 * @nump: pointer to store the resultant numerator
879 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 *
881 * Returns non-zero if the value is changed, zero if not changed.
882 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100883static int snd_interval_ratden(struct snd_interval *i,
884 unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 unsigned int *nump, unsigned int *denp)
886{
887 unsigned int best_num, best_diff, best_den;
888 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100889 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 int err;
891
892 best_num = best_den = best_diff = 0;
893 for (k = 0; k < rats_count; ++k) {
894 unsigned int num;
895 unsigned int den = rats[k].den;
896 unsigned int q = i->min;
897 int diff;
898 num = mul(q, den);
899 if (num > rats[k].num_max)
900 continue;
901 if (num < rats[k].num_min)
902 num = rats[k].num_max;
903 else {
904 unsigned int r;
905 r = (num - rats[k].num_min) % rats[k].num_step;
906 if (r != 0)
907 num += rats[k].num_step - r;
908 }
909 diff = num - q * den;
910 if (best_num == 0 ||
911 diff * best_den < best_diff * den) {
912 best_diff = diff;
913 best_den = den;
914 best_num = num;
915 }
916 }
917 if (best_den == 0) {
918 i->empty = 1;
919 return -EINVAL;
920 }
921 t.min = div_down(best_num, best_den);
922 t.openmin = !!(best_num % best_den);
923
924 best_num = best_den = best_diff = 0;
925 for (k = 0; k < rats_count; ++k) {
926 unsigned int num;
927 unsigned int den = rats[k].den;
928 unsigned int q = i->max;
929 int diff;
930 num = mul(q, den);
931 if (num < rats[k].num_min)
932 continue;
933 if (num > rats[k].num_max)
934 num = rats[k].num_max;
935 else {
936 unsigned int r;
937 r = (num - rats[k].num_min) % rats[k].num_step;
938 if (r != 0)
939 num -= r;
940 }
941 diff = q * den - num;
942 if (best_num == 0 ||
943 diff * best_den < best_diff * den) {
944 best_diff = diff;
945 best_den = den;
946 best_num = num;
947 }
948 }
949 if (best_den == 0) {
950 i->empty = 1;
951 return -EINVAL;
952 }
953 t.max = div_up(best_num, best_den);
954 t.openmax = !!(best_num % best_den);
955 t.integer = 0;
956 err = snd_interval_refine(i, &t);
957 if (err < 0)
958 return err;
959
960 if (snd_interval_single(i)) {
961 if (nump)
962 *nump = best_num;
963 if (denp)
964 *denp = best_den;
965 }
966 return err;
967}
968
969/**
970 * snd_interval_list - refine the interval value from the list
971 * @i: the interval value to refine
972 * @count: the number of elements in the list
973 * @list: the value list
974 * @mask: the bit-mask to evaluate
975 *
976 * Refines the interval value from the list.
977 * When mask is non-zero, only the elements corresponding to bit 1 are
978 * evaluated.
979 *
980 * Returns non-zero if the value is changed, zero if not changed.
981 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100982int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983{
984 unsigned int k;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +0200985 struct snd_interval list_range;
Takashi Iwai0981a262007-02-01 14:53:49 +0100986
987 if (!count) {
988 i->empty = 1;
989 return -EINVAL;
990 }
Clemens Ladischb1ddaf62009-08-25 08:15:41 +0200991 snd_interval_any(&list_range);
992 list_range.min = UINT_MAX;
993 list_range.max = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 for (k = 0; k < count; k++) {
995 if (mask && !(mask & (1 << k)))
996 continue;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +0200997 if (!snd_interval_test(i, list[k]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 continue;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +0200999 list_range.min = min(list_range.min, list[k]);
1000 list_range.max = max(list_range.max, list[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 }
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001002 return snd_interval_refine(i, &list_range);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003}
1004
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001005EXPORT_SYMBOL(snd_interval_list);
1006
Takashi Iwai877211f2005-11-17 13:59:38 +01001007static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
1009 unsigned int n;
1010 int changed = 0;
1011 n = (i->min - min) % step;
1012 if (n != 0 || i->openmin) {
1013 i->min += step - n;
1014 changed = 1;
1015 }
1016 n = (i->max - min) % step;
1017 if (n != 0 || i->openmax) {
1018 i->max -= n;
1019 changed = 1;
1020 }
1021 if (snd_interval_checkempty(i)) {
1022 i->empty = 1;
1023 return -EINVAL;
1024 }
1025 return changed;
1026}
1027
1028/* Info constraints helpers */
1029
1030/**
1031 * snd_pcm_hw_rule_add - add the hw-constraint rule
1032 * @runtime: the pcm runtime instance
1033 * @cond: condition bits
1034 * @var: the variable to evaluate
1035 * @func: the evaluation function
1036 * @private: the private data pointer passed to function
1037 * @dep: the dependent variables
1038 *
1039 * Returns zero if successful, or a negative error code on failure.
1040 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001041int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 int var,
1043 snd_pcm_hw_rule_func_t func, void *private,
1044 int dep, ...)
1045{
Takashi Iwai877211f2005-11-17 13:59:38 +01001046 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1047 struct snd_pcm_hw_rule *c;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 unsigned int k;
1049 va_list args;
1050 va_start(args, dep);
1051 if (constrs->rules_num >= constrs->rules_all) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001052 struct snd_pcm_hw_rule *new;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 unsigned int new_rules = constrs->rules_all + 16;
1054 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1055 if (!new)
1056 return -ENOMEM;
1057 if (constrs->rules) {
1058 memcpy(new, constrs->rules,
1059 constrs->rules_num * sizeof(*c));
1060 kfree(constrs->rules);
1061 }
1062 constrs->rules = new;
1063 constrs->rules_all = new_rules;
1064 }
1065 c = &constrs->rules[constrs->rules_num];
1066 c->cond = cond;
1067 c->func = func;
1068 c->var = var;
1069 c->private = private;
1070 k = 0;
1071 while (1) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001072 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1073 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 c->deps[k++] = dep;
1075 if (dep < 0)
1076 break;
1077 dep = va_arg(args, int);
1078 }
1079 constrs->rules_num++;
1080 va_end(args);
1081 return 0;
1082}
1083
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001084EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1085
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001087 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001088 * @runtime: PCM runtime instance
1089 * @var: hw_params variable to apply the mask
1090 * @mask: the bitmap mask
1091 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001092 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001094int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 u_int32_t mask)
1096{
Takashi Iwai877211f2005-11-17 13:59:38 +01001097 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1098 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 *maskp->bits &= mask;
1100 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1101 if (*maskp->bits == 0)
1102 return -EINVAL;
1103 return 0;
1104}
1105
1106/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001107 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001108 * @runtime: PCM runtime instance
1109 * @var: hw_params variable to apply the mask
1110 * @mask: the 64bit bitmap mask
1111 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001112 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001114int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 u_int64_t mask)
1116{
Takashi Iwai877211f2005-11-17 13:59:38 +01001117 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1118 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 maskp->bits[0] &= (u_int32_t)mask;
1120 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1121 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1122 if (! maskp->bits[0] && ! maskp->bits[1])
1123 return -EINVAL;
1124 return 0;
1125}
1126
1127/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001128 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001129 * @runtime: PCM runtime instance
1130 * @var: hw_params variable to apply the integer constraint
1131 *
1132 * Apply the constraint of integer to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001134int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135{
Takashi Iwai877211f2005-11-17 13:59:38 +01001136 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 return snd_interval_setinteger(constrs_interval(constrs, var));
1138}
1139
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001140EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001143 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001144 * @runtime: PCM runtime instance
1145 * @var: hw_params variable to apply the range
1146 * @min: the minimal value
1147 * @max: the maximal value
1148 *
1149 * Apply the min/max range constraint to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001151int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 unsigned int min, unsigned int max)
1153{
Takashi Iwai877211f2005-11-17 13:59:38 +01001154 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1155 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 t.min = min;
1157 t.max = max;
1158 t.openmin = t.openmax = 0;
1159 t.integer = 0;
1160 return snd_interval_refine(constrs_interval(constrs, var), &t);
1161}
1162
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001163EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1164
Takashi Iwai877211f2005-11-17 13:59:38 +01001165static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1166 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167{
Takashi Iwai877211f2005-11-17 13:59:38 +01001168 struct snd_pcm_hw_constraint_list *list = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1170}
1171
1172
1173/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001174 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001175 * @runtime: PCM runtime instance
1176 * @cond: condition bits
1177 * @var: hw_params variable to apply the list constraint
1178 * @l: list
1179 *
1180 * Apply the list of constraints to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001182int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 unsigned int cond,
1184 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001185 struct snd_pcm_hw_constraint_list *l)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186{
1187 return snd_pcm_hw_rule_add(runtime, cond, var,
1188 snd_pcm_hw_rule_list, l,
1189 var, -1);
1190}
1191
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001192EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1193
Takashi Iwai877211f2005-11-17 13:59:38 +01001194static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1195 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
Takashi Iwai877211f2005-11-17 13:59:38 +01001197 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 unsigned int num = 0, den = 0;
1199 int err;
1200 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1201 r->nrats, r->rats, &num, &den);
1202 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1203 params->rate_num = num;
1204 params->rate_den = den;
1205 }
1206 return err;
1207}
1208
1209/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001210 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001211 * @runtime: PCM runtime instance
1212 * @cond: condition bits
1213 * @var: hw_params variable to apply the ratnums constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001214 * @r: struct snd_ratnums constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001216int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 unsigned int cond,
1218 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001219 struct snd_pcm_hw_constraint_ratnums *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220{
1221 return snd_pcm_hw_rule_add(runtime, cond, var,
1222 snd_pcm_hw_rule_ratnums, r,
1223 var, -1);
1224}
1225
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001226EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1227
Takashi Iwai877211f2005-11-17 13:59:38 +01001228static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1229 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230{
Takashi Iwai877211f2005-11-17 13:59:38 +01001231 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 unsigned int num = 0, den = 0;
1233 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1234 r->nrats, r->rats, &num, &den);
1235 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1236 params->rate_num = num;
1237 params->rate_den = den;
1238 }
1239 return err;
1240}
1241
1242/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001243 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001244 * @runtime: PCM runtime instance
1245 * @cond: condition bits
1246 * @var: hw_params variable to apply the ratdens constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001247 * @r: struct snd_ratdens constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001249int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 unsigned int cond,
1251 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001252 struct snd_pcm_hw_constraint_ratdens *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253{
1254 return snd_pcm_hw_rule_add(runtime, cond, var,
1255 snd_pcm_hw_rule_ratdens, r,
1256 var, -1);
1257}
1258
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001259EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1260
Takashi Iwai877211f2005-11-17 13:59:38 +01001261static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1262 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263{
1264 unsigned int l = (unsigned long) rule->private;
1265 int width = l & 0xffff;
1266 unsigned int msbits = l >> 16;
Takashi Iwai877211f2005-11-17 13:59:38 +01001267 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 if (snd_interval_single(i) && snd_interval_value(i) == width)
1269 params->msbits = msbits;
1270 return 0;
1271}
1272
1273/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001274 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001275 * @runtime: PCM runtime instance
1276 * @cond: condition bits
1277 * @width: sample bits width
1278 * @msbits: msbits width
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001280int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 unsigned int cond,
1282 unsigned int width,
1283 unsigned int msbits)
1284{
1285 unsigned long l = (msbits << 16) | width;
1286 return snd_pcm_hw_rule_add(runtime, cond, -1,
1287 snd_pcm_hw_rule_msbits,
1288 (void*) l,
1289 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1290}
1291
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001292EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1293
Takashi Iwai877211f2005-11-17 13:59:38 +01001294static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1295 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
1297 unsigned long step = (unsigned long) rule->private;
1298 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1299}
1300
1301/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001302 * snd_pcm_hw_constraint_step - add a hw constraint step rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001303 * @runtime: PCM runtime instance
1304 * @cond: condition bits
1305 * @var: hw_params variable to apply the step constraint
1306 * @step: step size
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001308int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 unsigned int cond,
1310 snd_pcm_hw_param_t var,
1311 unsigned long step)
1312{
1313 return snd_pcm_hw_rule_add(runtime, cond, var,
1314 snd_pcm_hw_rule_step, (void *) step,
1315 var, -1);
1316}
1317
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001318EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1319
Takashi Iwai877211f2005-11-17 13:59:38 +01001320static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
Marcin Åšlusarz67c39312007-12-14 12:53:21 +01001322 static unsigned int pow2_sizes[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1324 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1325 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1326 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1327 };
1328 return snd_interval_list(hw_param_interval(params, rule->var),
1329 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1330}
1331
1332/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001333 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001334 * @runtime: PCM runtime instance
1335 * @cond: condition bits
1336 * @var: hw_params variable to apply the power-of-2 constraint
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001338int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 unsigned int cond,
1340 snd_pcm_hw_param_t var)
1341{
1342 return snd_pcm_hw_rule_add(runtime, cond, var,
1343 snd_pcm_hw_rule_pow2, NULL,
1344 var, -1);
1345}
1346
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001347EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1348
Takashi Iwai877211f2005-11-17 13:59:38 +01001349static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001350 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
1352 if (hw_is_mask(var)) {
1353 snd_mask_any(hw_param_mask(params, var));
1354 params->cmask |= 1 << var;
1355 params->rmask |= 1 << var;
1356 return;
1357 }
1358 if (hw_is_interval(var)) {
1359 snd_interval_any(hw_param_interval(params, var));
1360 params->cmask |= 1 << var;
1361 params->rmask |= 1 << var;
1362 return;
1363 }
1364 snd_BUG();
1365}
1366
Takashi Iwai877211f2005-11-17 13:59:38 +01001367void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368{
1369 unsigned int k;
1370 memset(params, 0, sizeof(*params));
1371 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1372 _snd_pcm_hw_param_any(params, k);
1373 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1374 _snd_pcm_hw_param_any(params, k);
1375 params->info = ~0U;
1376}
1377
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001378EXPORT_SYMBOL(_snd_pcm_hw_params_any);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001381 * snd_pcm_hw_param_value - return @params field @var value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001382 * @params: the hw_params instance
1383 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001384 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001386 * Return the value for field @var if it's fixed in configuration space
1387 * defined by @params. Return -%EINVAL otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001389int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1390 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391{
1392 if (hw_is_mask(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001393 const struct snd_mask *mask = hw_param_mask_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 if (!snd_mask_single(mask))
1395 return -EINVAL;
1396 if (dir)
1397 *dir = 0;
1398 return snd_mask_value(mask);
1399 }
1400 if (hw_is_interval(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001401 const struct snd_interval *i = hw_param_interval_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 if (!snd_interval_single(i))
1403 return -EINVAL;
1404 if (dir)
1405 *dir = i->openmin;
1406 return snd_interval_value(i);
1407 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 return -EINVAL;
1409}
1410
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001411EXPORT_SYMBOL(snd_pcm_hw_param_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
Takashi Iwai877211f2005-11-17 13:59:38 +01001413void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 snd_pcm_hw_param_t var)
1415{
1416 if (hw_is_mask(var)) {
1417 snd_mask_none(hw_param_mask(params, var));
1418 params->cmask |= 1 << var;
1419 params->rmask |= 1 << var;
1420 } else if (hw_is_interval(var)) {
1421 snd_interval_none(hw_param_interval(params, var));
1422 params->cmask |= 1 << var;
1423 params->rmask |= 1 << var;
1424 } else {
1425 snd_BUG();
1426 }
1427}
1428
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001429EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
Takashi Iwai877211f2005-11-17 13:59:38 +01001431static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001432 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433{
1434 int changed;
1435 if (hw_is_mask(var))
1436 changed = snd_mask_refine_first(hw_param_mask(params, var));
1437 else if (hw_is_interval(var))
1438 changed = snd_interval_refine_first(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001439 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 if (changed) {
1442 params->cmask |= 1 << var;
1443 params->rmask |= 1 << var;
1444 }
1445 return changed;
1446}
1447
1448
1449/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001450 * snd_pcm_hw_param_first - refine config space and return minimum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001451 * @pcm: PCM instance
1452 * @params: the hw_params instance
1453 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001454 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001456 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 * values > minimum. Reduce configuration space accordingly.
1458 * Return the minimum.
1459 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001460int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1461 struct snd_pcm_hw_params *params,
1462 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463{
1464 int changed = _snd_pcm_hw_param_first(params, var);
1465 if (changed < 0)
1466 return changed;
1467 if (params->rmask) {
1468 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001469 if (snd_BUG_ON(err < 0))
1470 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 }
1472 return snd_pcm_hw_param_value(params, var, dir);
1473}
1474
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001475EXPORT_SYMBOL(snd_pcm_hw_param_first);
1476
Takashi Iwai877211f2005-11-17 13:59:38 +01001477static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001478 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479{
1480 int changed;
1481 if (hw_is_mask(var))
1482 changed = snd_mask_refine_last(hw_param_mask(params, var));
1483 else if (hw_is_interval(var))
1484 changed = snd_interval_refine_last(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001485 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 if (changed) {
1488 params->cmask |= 1 << var;
1489 params->rmask |= 1 << var;
1490 }
1491 return changed;
1492}
1493
1494
1495/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001496 * snd_pcm_hw_param_last - refine config space and return maximum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001497 * @pcm: PCM instance
1498 * @params: the hw_params instance
1499 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001500 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001502 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 * values < maximum. Reduce configuration space accordingly.
1504 * Return the maximum.
1505 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001506int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1507 struct snd_pcm_hw_params *params,
1508 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509{
1510 int changed = _snd_pcm_hw_param_last(params, var);
1511 if (changed < 0)
1512 return changed;
1513 if (params->rmask) {
1514 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001515 if (snd_BUG_ON(err < 0))
1516 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 }
1518 return snd_pcm_hw_param_value(params, var, dir);
1519}
1520
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001521EXPORT_SYMBOL(snd_pcm_hw_param_last);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
1523/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001524 * snd_pcm_hw_param_choose - choose a configuration defined by @params
Takashi Iwaidf8db932005-09-07 13:38:19 +02001525 * @pcm: PCM instance
1526 * @params: the hw_params instance
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001528 * Choose one configuration from configuration space defined by @params.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 * The configuration chosen is that obtained fixing in this order:
1530 * first access, first format, first subformat, min channels,
1531 * min rate, min period time, max buffer size, min tick time
1532 */
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001533int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1534 struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535{
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001536 static int vars[] = {
1537 SNDRV_PCM_HW_PARAM_ACCESS,
1538 SNDRV_PCM_HW_PARAM_FORMAT,
1539 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1540 SNDRV_PCM_HW_PARAM_CHANNELS,
1541 SNDRV_PCM_HW_PARAM_RATE,
1542 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1543 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1544 SNDRV_PCM_HW_PARAM_TICK_TIME,
1545 -1
1546 };
1547 int err, *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001549 for (v = vars; *v != -1; v++) {
1550 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1551 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1552 else
1553 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001554 if (snd_BUG_ON(err < 0))
1555 return err;
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 return 0;
1558}
1559
Takashi Iwai877211f2005-11-17 13:59:38 +01001560static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 void *arg)
1562{
Takashi Iwai877211f2005-11-17 13:59:38 +01001563 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 unsigned long flags;
1565 snd_pcm_stream_lock_irqsave(substream, flags);
1566 if (snd_pcm_running(substream) &&
1567 snd_pcm_update_hw_ptr(substream) >= 0)
1568 runtime->status->hw_ptr %= runtime->buffer_size;
1569 else
1570 runtime->status->hw_ptr = 0;
1571 snd_pcm_stream_unlock_irqrestore(substream, flags);
1572 return 0;
1573}
1574
Takashi Iwai877211f2005-11-17 13:59:38 +01001575static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 void *arg)
1577{
Takashi Iwai877211f2005-11-17 13:59:38 +01001578 struct snd_pcm_channel_info *info = arg;
1579 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 int width;
1581 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1582 info->offset = -1;
1583 return 0;
1584 }
1585 width = snd_pcm_format_physical_width(runtime->format);
1586 if (width < 0)
1587 return width;
1588 info->offset = 0;
1589 switch (runtime->access) {
1590 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1591 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1592 info->first = info->channel * width;
1593 info->step = runtime->channels * width;
1594 break;
1595 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1596 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1597 {
1598 size_t size = runtime->dma_bytes / runtime->channels;
1599 info->first = info->channel * size * 8;
1600 info->step = width;
1601 break;
1602 }
1603 default:
1604 snd_BUG();
1605 break;
1606 }
1607 return 0;
1608}
1609
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001610static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1611 void *arg)
1612{
1613 struct snd_pcm_hw_params *params = arg;
1614 snd_pcm_format_t format;
1615 int channels, width;
1616
1617 params->fifo_size = substream->runtime->hw.fifo_size;
1618 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1619 format = params_format(params);
1620 channels = params_channels(params);
1621 width = snd_pcm_format_physical_width(format);
1622 params->fifo_size /= width * channels;
1623 }
1624 return 0;
1625}
1626
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627/**
1628 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1629 * @substream: the pcm substream instance
1630 * @cmd: ioctl command
1631 * @arg: ioctl argument
1632 *
1633 * Processes the generic ioctl commands for PCM.
1634 * Can be passed as the ioctl callback for PCM ops.
1635 *
1636 * Returns zero if successful, or a negative error code on failure.
1637 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001638int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 unsigned int cmd, void *arg)
1640{
1641 switch (cmd) {
1642 case SNDRV_PCM_IOCTL1_INFO:
1643 return 0;
1644 case SNDRV_PCM_IOCTL1_RESET:
1645 return snd_pcm_lib_ioctl_reset(substream, arg);
1646 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1647 return snd_pcm_lib_ioctl_channel_info(substream, arg);
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001648 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1649 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 }
1651 return -ENXIO;
1652}
1653
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001654EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1655
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656/**
1657 * snd_pcm_period_elapsed - update the pcm status for the next period
1658 * @substream: the pcm substream instance
1659 *
1660 * This function is called from the interrupt handler when the
1661 * PCM has processed the period size. It will update the current
Takashi Iwai31e89602008-01-08 18:09:57 +01001662 * pointer, wake up sleepers, etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 *
1664 * Even if more than one periods have elapsed since the last call, you
1665 * have to call this only once.
1666 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001667void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668{
Takashi Iwai877211f2005-11-17 13:59:38 +01001669 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 unsigned long flags;
1671
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001672 if (PCM_RUNTIME_CHECK(substream))
1673 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
1676 if (runtime->transfer_ack_begin)
1677 runtime->transfer_ack_begin(substream);
1678
1679 snd_pcm_stream_lock_irqsave(substream, flags);
1680 if (!snd_pcm_running(substream) ||
Jaroslav Kyselaf2404062010-01-05 17:19:34 +01001681 snd_pcm_update_hw_ptr0(substream, 1) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 goto _end;
1683
1684 if (substream->timer_running)
1685 snd_timer_interrupt(substream->timer, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 _end:
1687 snd_pcm_stream_unlock_irqrestore(substream, flags);
1688 if (runtime->transfer_ack_end)
1689 runtime->transfer_ack_end(substream);
1690 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1691}
1692
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001693EXPORT_SYMBOL(snd_pcm_period_elapsed);
1694
Takashi Iwai13075512008-01-08 18:08:14 +01001695/*
1696 * Wait until avail_min data becomes available
1697 * Returns a negative error code if any error occurs during operation.
1698 * The available space is stored on availp. When err = 0 and avail = 0
1699 * on the capture stream, it indicates the stream is in DRAINING state.
1700 */
1701static int wait_for_avail_min(struct snd_pcm_substream *substream,
1702 snd_pcm_uframes_t *availp)
1703{
1704 struct snd_pcm_runtime *runtime = substream->runtime;
1705 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1706 wait_queue_t wait;
1707 int err = 0;
1708 snd_pcm_uframes_t avail = 0;
1709 long tout;
1710
1711 init_waitqueue_entry(&wait, current);
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001712 add_wait_queue(&runtime->tsleep, &wait);
Takashi Iwai13075512008-01-08 18:08:14 +01001713 for (;;) {
1714 if (signal_pending(current)) {
1715 err = -ERESTARTSYS;
1716 break;
1717 }
1718 set_current_state(TASK_INTERRUPTIBLE);
1719 snd_pcm_stream_unlock_irq(substream);
1720 tout = schedule_timeout(msecs_to_jiffies(10000));
1721 snd_pcm_stream_lock_irq(substream);
1722 switch (runtime->status->state) {
1723 case SNDRV_PCM_STATE_SUSPENDED:
1724 err = -ESTRPIPE;
1725 goto _endloop;
1726 case SNDRV_PCM_STATE_XRUN:
1727 err = -EPIPE;
1728 goto _endloop;
1729 case SNDRV_PCM_STATE_DRAINING:
1730 if (is_playback)
1731 err = -EPIPE;
1732 else
1733 avail = 0; /* indicate draining */
1734 goto _endloop;
1735 case SNDRV_PCM_STATE_OPEN:
1736 case SNDRV_PCM_STATE_SETUP:
1737 case SNDRV_PCM_STATE_DISCONNECTED:
1738 err = -EBADFD;
1739 goto _endloop;
1740 }
1741 if (!tout) {
1742 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1743 is_playback ? "playback" : "capture");
1744 err = -EIO;
1745 break;
1746 }
1747 if (is_playback)
1748 avail = snd_pcm_playback_avail(runtime);
1749 else
1750 avail = snd_pcm_capture_avail(runtime);
1751 if (avail >= runtime->control->avail_min)
1752 break;
1753 }
1754 _endloop:
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001755 remove_wait_queue(&runtime->tsleep, &wait);
Takashi Iwai13075512008-01-08 18:08:14 +01001756 *availp = avail;
1757 return err;
1758}
1759
Takashi Iwai877211f2005-11-17 13:59:38 +01001760static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 unsigned int hwoff,
1762 unsigned long data, unsigned int off,
1763 snd_pcm_uframes_t frames)
1764{
Takashi Iwai877211f2005-11-17 13:59:38 +01001765 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 int err;
1767 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1768 if (substream->ops->copy) {
1769 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1770 return err;
1771 } else {
1772 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1774 return -EFAULT;
1775 }
1776 return 0;
1777}
1778
Takashi Iwai877211f2005-11-17 13:59:38 +01001779typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 unsigned long data, unsigned int off,
1781 snd_pcm_uframes_t size);
1782
Takashi Iwai877211f2005-11-17 13:59:38 +01001783static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 unsigned long data,
1785 snd_pcm_uframes_t size,
1786 int nonblock,
1787 transfer_f transfer)
1788{
Takashi Iwai877211f2005-11-17 13:59:38 +01001789 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 snd_pcm_uframes_t xfer = 0;
1791 snd_pcm_uframes_t offset = 0;
1792 int err = 0;
1793
1794 if (size == 0)
1795 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796
1797 snd_pcm_stream_lock_irq(substream);
1798 switch (runtime->status->state) {
1799 case SNDRV_PCM_STATE_PREPARED:
1800 case SNDRV_PCM_STATE_RUNNING:
1801 case SNDRV_PCM_STATE_PAUSED:
1802 break;
1803 case SNDRV_PCM_STATE_XRUN:
1804 err = -EPIPE;
1805 goto _end_unlock;
1806 case SNDRV_PCM_STATE_SUSPENDED:
1807 err = -ESTRPIPE;
1808 goto _end_unlock;
1809 default:
1810 err = -EBADFD;
1811 goto _end_unlock;
1812 }
1813
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001814 runtime->twake = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 while (size > 0) {
1816 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1817 snd_pcm_uframes_t avail;
1818 snd_pcm_uframes_t cont;
Takashi Iwai31e89602008-01-08 18:09:57 +01001819 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 snd_pcm_update_hw_ptr(substream);
1821 avail = snd_pcm_playback_avail(runtime);
Takashi Iwai13075512008-01-08 18:08:14 +01001822 if (!avail) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 if (nonblock) {
1824 err = -EAGAIN;
1825 goto _end_unlock;
1826 }
Takashi Iwai13075512008-01-08 18:08:14 +01001827 err = wait_for_avail_min(substream, &avail);
1828 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 frames = size > avail ? avail : size;
1832 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1833 if (frames > cont)
1834 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001835 if (snd_BUG_ON(!frames)) {
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001836 runtime->twake = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001837 snd_pcm_stream_unlock_irq(substream);
1838 return -EINVAL;
1839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 appl_ptr = runtime->control->appl_ptr;
1841 appl_ofs = appl_ptr % runtime->buffer_size;
1842 snd_pcm_stream_unlock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01001843 err = transfer(substream, appl_ofs, data, offset, frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 snd_pcm_stream_lock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01001845 if (err < 0)
1846 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 switch (runtime->status->state) {
1848 case SNDRV_PCM_STATE_XRUN:
1849 err = -EPIPE;
1850 goto _end_unlock;
1851 case SNDRV_PCM_STATE_SUSPENDED:
1852 err = -ESTRPIPE;
1853 goto _end_unlock;
1854 default:
1855 break;
1856 }
1857 appl_ptr += frames;
1858 if (appl_ptr >= runtime->boundary)
1859 appl_ptr -= runtime->boundary;
1860 runtime->control->appl_ptr = appl_ptr;
1861 if (substream->ops->ack)
1862 substream->ops->ack(substream);
1863
1864 offset += frames;
1865 size -= frames;
1866 xfer += frames;
1867 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1868 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1869 err = snd_pcm_start(substream);
1870 if (err < 0)
1871 goto _end_unlock;
1872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 }
1874 _end_unlock:
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001875 runtime->twake = 0;
Jaroslav Kysela12509322010-01-07 15:36:31 +01001876 if (xfer > 0 && err >= 0)
1877 snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 snd_pcm_stream_unlock_irq(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1880}
1881
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001882/* sanity-check for read/write methods */
1883static int pcm_sanity_check(struct snd_pcm_substream *substream)
1884{
1885 struct snd_pcm_runtime *runtime;
1886 if (PCM_RUNTIME_CHECK(substream))
1887 return -ENXIO;
1888 runtime = substream->runtime;
1889 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1890 return -EINVAL;
1891 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1892 return -EBADFD;
1893 return 0;
1894}
1895
Takashi Iwai877211f2005-11-17 13:59:38 +01001896snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897{
Takashi Iwai877211f2005-11-17 13:59:38 +01001898 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001900 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001902 err = pcm_sanity_check(substream);
1903 if (err < 0)
1904 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02001906 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907
1908 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1909 runtime->channels > 1)
1910 return -EINVAL;
1911 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1912 snd_pcm_lib_write_transfer);
1913}
1914
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001915EXPORT_SYMBOL(snd_pcm_lib_write);
1916
Takashi Iwai877211f2005-11-17 13:59:38 +01001917static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 unsigned int hwoff,
1919 unsigned long data, unsigned int off,
1920 snd_pcm_uframes_t frames)
1921{
Takashi Iwai877211f2005-11-17 13:59:38 +01001922 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 int err;
1924 void __user **bufs = (void __user **)data;
1925 int channels = runtime->channels;
1926 int c;
1927 if (substream->ops->copy) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001928 if (snd_BUG_ON(!substream->ops->silence))
1929 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 for (c = 0; c < channels; ++c, ++bufs) {
1931 if (*bufs == NULL) {
1932 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1933 return err;
1934 } else {
1935 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1936 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1937 return err;
1938 }
1939 }
1940 } else {
1941 /* default transfer behaviour */
1942 size_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 for (c = 0; c < channels; ++c, ++bufs) {
1944 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1945 if (*bufs == NULL) {
1946 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1947 } else {
1948 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1949 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1950 return -EFAULT;
1951 }
1952 }
1953 }
1954 return 0;
1955}
1956
Takashi Iwai877211f2005-11-17 13:59:38 +01001957snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 void __user **bufs,
1959 snd_pcm_uframes_t frames)
1960{
Takashi Iwai877211f2005-11-17 13:59:38 +01001961 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001963 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001965 err = pcm_sanity_check(substream);
1966 if (err < 0)
1967 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02001969 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970
1971 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1972 return -EINVAL;
1973 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1974 nonblock, snd_pcm_lib_writev_transfer);
1975}
1976
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001977EXPORT_SYMBOL(snd_pcm_lib_writev);
1978
Takashi Iwai877211f2005-11-17 13:59:38 +01001979static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 unsigned int hwoff,
1981 unsigned long data, unsigned int off,
1982 snd_pcm_uframes_t frames)
1983{
Takashi Iwai877211f2005-11-17 13:59:38 +01001984 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 int err;
1986 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1987 if (substream->ops->copy) {
1988 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1989 return err;
1990 } else {
1991 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1993 return -EFAULT;
1994 }
1995 return 0;
1996}
1997
Takashi Iwai877211f2005-11-17 13:59:38 +01001998static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 unsigned long data,
2000 snd_pcm_uframes_t size,
2001 int nonblock,
2002 transfer_f transfer)
2003{
Takashi Iwai877211f2005-11-17 13:59:38 +01002004 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 snd_pcm_uframes_t xfer = 0;
2006 snd_pcm_uframes_t offset = 0;
2007 int err = 0;
2008
2009 if (size == 0)
2010 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
2012 snd_pcm_stream_lock_irq(substream);
2013 switch (runtime->status->state) {
2014 case SNDRV_PCM_STATE_PREPARED:
2015 if (size >= runtime->start_threshold) {
2016 err = snd_pcm_start(substream);
2017 if (err < 0)
2018 goto _end_unlock;
2019 }
2020 break;
2021 case SNDRV_PCM_STATE_DRAINING:
2022 case SNDRV_PCM_STATE_RUNNING:
2023 case SNDRV_PCM_STATE_PAUSED:
2024 break;
2025 case SNDRV_PCM_STATE_XRUN:
2026 err = -EPIPE;
2027 goto _end_unlock;
2028 case SNDRV_PCM_STATE_SUSPENDED:
2029 err = -ESTRPIPE;
2030 goto _end_unlock;
2031 default:
2032 err = -EBADFD;
2033 goto _end_unlock;
2034 }
2035
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002036 runtime->twake = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 while (size > 0) {
2038 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2039 snd_pcm_uframes_t avail;
2040 snd_pcm_uframes_t cont;
Takashi Iwai31e89602008-01-08 18:09:57 +01002041 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 snd_pcm_update_hw_ptr(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 avail = snd_pcm_capture_avail(runtime);
Takashi Iwai13075512008-01-08 18:08:14 +01002044 if (!avail) {
2045 if (runtime->status->state ==
2046 SNDRV_PCM_STATE_DRAINING) {
2047 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 goto _end_unlock;
2049 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 if (nonblock) {
2051 err = -EAGAIN;
2052 goto _end_unlock;
2053 }
Takashi Iwai13075512008-01-08 18:08:14 +01002054 err = wait_for_avail_min(substream, &avail);
2055 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 goto _end_unlock;
Takashi Iwai13075512008-01-08 18:08:14 +01002057 if (!avail)
2058 continue; /* draining */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060 frames = size > avail ? avail : size;
2061 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2062 if (frames > cont)
2063 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002064 if (snd_BUG_ON(!frames)) {
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002065 runtime->twake = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002066 snd_pcm_stream_unlock_irq(substream);
2067 return -EINVAL;
2068 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 appl_ptr = runtime->control->appl_ptr;
2070 appl_ofs = appl_ptr % runtime->buffer_size;
2071 snd_pcm_stream_unlock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002072 err = transfer(substream, appl_ofs, data, offset, frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 snd_pcm_stream_lock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002074 if (err < 0)
2075 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076 switch (runtime->status->state) {
2077 case SNDRV_PCM_STATE_XRUN:
2078 err = -EPIPE;
2079 goto _end_unlock;
2080 case SNDRV_PCM_STATE_SUSPENDED:
2081 err = -ESTRPIPE;
2082 goto _end_unlock;
2083 default:
2084 break;
2085 }
2086 appl_ptr += frames;
2087 if (appl_ptr >= runtime->boundary)
2088 appl_ptr -= runtime->boundary;
2089 runtime->control->appl_ptr = appl_ptr;
2090 if (substream->ops->ack)
2091 substream->ops->ack(substream);
2092
2093 offset += frames;
2094 size -= frames;
2095 xfer += frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 }
2097 _end_unlock:
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002098 runtime->twake = 0;
Jaroslav Kysela12509322010-01-07 15:36:31 +01002099 if (xfer > 0 && err >= 0)
2100 snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 snd_pcm_stream_unlock_irq(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2103}
2104
Takashi Iwai877211f2005-11-17 13:59:38 +01002105snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106{
Takashi Iwai877211f2005-11-17 13:59:38 +01002107 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002109 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002111 err = pcm_sanity_check(substream);
2112 if (err < 0)
2113 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02002115 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2117 return -EINVAL;
2118 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2119}
2120
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02002121EXPORT_SYMBOL(snd_pcm_lib_read);
2122
Takashi Iwai877211f2005-11-17 13:59:38 +01002123static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 unsigned int hwoff,
2125 unsigned long data, unsigned int off,
2126 snd_pcm_uframes_t frames)
2127{
Takashi Iwai877211f2005-11-17 13:59:38 +01002128 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 int err;
2130 void __user **bufs = (void __user **)data;
2131 int channels = runtime->channels;
2132 int c;
2133 if (substream->ops->copy) {
2134 for (c = 0; c < channels; ++c, ++bufs) {
2135 char __user *buf;
2136 if (*bufs == NULL)
2137 continue;
2138 buf = *bufs + samples_to_bytes(runtime, off);
2139 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2140 return err;
2141 }
2142 } else {
2143 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 for (c = 0; c < channels; ++c, ++bufs) {
2145 char *hwbuf;
2146 char __user *buf;
2147 if (*bufs == NULL)
2148 continue;
2149
2150 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2151 buf = *bufs + samples_to_bytes(runtime, off);
2152 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2153 return -EFAULT;
2154 }
2155 }
2156 return 0;
2157}
2158
Takashi Iwai877211f2005-11-17 13:59:38 +01002159snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 void __user **bufs,
2161 snd_pcm_uframes_t frames)
2162{
Takashi Iwai877211f2005-11-17 13:59:38 +01002163 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002165 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002167 err = pcm_sanity_check(substream);
2168 if (err < 0)
2169 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2172 return -EBADFD;
2173
Takashi Iwai0df63e42006-04-28 15:13:41 +02002174 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2176 return -EINVAL;
2177 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2178}
2179
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180EXPORT_SYMBOL(snd_pcm_lib_readv);