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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 Iwaied3da3d2009-03-03 17:00:15 +0100129#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200130#define xrun_debug(substream, mask) ((substream)->pstr->xrun_debug & (mask))
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100131#else
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200132#define xrun_debug(substream, mask) 0
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100133#endif
134
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200135#define dump_stack_on_xrun(substream) do { \
136 if (xrun_debug(substream, 2)) \
137 dump_stack(); \
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100138 } while (0)
139
Takashi Iwaic0070112009-06-08 15:58:48 +0200140static void pcm_debug_name(struct snd_pcm_substream *substream,
141 char *name, size_t len)
142{
143 snprintf(name, len, "pcmC%dD%d%c:%d",
144 substream->pcm->card->number,
145 substream->pcm->device,
146 substream->stream ? 'c' : 'p',
147 substream->number);
148}
149
Takashi Iwai877211f2005-11-17 13:59:38 +0100150static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200152 struct snd_pcm_runtime *runtime = substream->runtime;
153
154 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
155 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200157 if (xrun_debug(substream, 1)) {
Takashi Iwaic0070112009-06-08 15:58:48 +0200158 char name[16];
159 pcm_debug_name(substream, name, sizeof(name));
160 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100161 dump_stack_on_xrun(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Takashi Iwai98204642009-03-19 09:59:21 +0100165static snd_pcm_uframes_t
166snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
167 struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
169 snd_pcm_uframes_t pos;
170
171 pos = substream->ops->pointer(substream);
172 if (pos == SNDRV_PCM_POS_XRUN)
173 return pos; /* XRUN */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (pos >= runtime->buffer_size) {
Takashi Iwai5f513e12009-03-19 10:01:47 +0100175 if (printk_ratelimit()) {
Takashi Iwaic0070112009-06-08 15:58:48 +0200176 char name[16];
177 pcm_debug_name(substream, name, sizeof(name));
178 snd_printd(KERN_ERR "BUG: %s, pos = 0x%lx, "
Takashi Iwai5f513e12009-03-19 10:01:47 +0100179 "buffer size = 0x%lx, period size = 0x%lx\n",
Takashi Iwaic0070112009-06-08 15:58:48 +0200180 name, pos, runtime->buffer_size,
Takashi Iwai5f513e12009-03-19 10:01:47 +0100181 runtime->period_size);
182 }
183 pos = 0;
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 pos -= pos % runtime->min_align;
186 return pos;
187}
188
Takashi Iwai98204642009-03-19 09:59:21 +0100189static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
190 struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 snd_pcm_uframes_t avail;
193
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 avail = snd_pcm_playback_avail(runtime);
196 else
197 avail = snd_pcm_capture_avail(runtime);
198 if (avail > runtime->avail_max)
199 runtime->avail_max = avail;
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200200 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
201 if (avail >= runtime->buffer_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 snd_pcm_drain_done(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200203 return -EPIPE;
204 }
205 } else {
206 if (avail >= runtime->stop_threshold) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 xrun(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200208 return -EPIPE;
209 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211 if (avail >= runtime->control->avail_min)
212 wake_up(&runtime->sleep);
213 return 0;
214}
215
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100216#define hw_ptr_error(substream, fmt, args...) \
217 do { \
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200218 if (xrun_debug(substream, 1)) { \
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100219 if (printk_ratelimit()) { \
Takashi Iwaicad377a2009-03-19 09:55:15 +0100220 snd_printd("PCM: " fmt, ##args); \
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100221 } \
222 dump_stack_on_xrun(substream); \
223 } \
224 } while (0)
225
Takashi Iwai98204642009-03-19 09:59:21 +0100226static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Takashi Iwai877211f2005-11-17 13:59:38 +0100228 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 snd_pcm_uframes_t pos;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200230 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
231 snd_pcm_sframes_t hdelta, delta;
232 unsigned long jdelta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200234 old_hw_ptr = runtime->status->hw_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
236 if (pos == SNDRV_PCM_POS_XRUN) {
237 xrun(substream);
238 return -EPIPE;
239 }
Takashi Iwaicedb8112009-07-23 11:04:13 +0200240 if (xrun_debug(substream, 8)) {
241 char name[16];
242 pcm_debug_name(substream, name, sizeof(name));
243 snd_printd("period_update: %s: pos=0x%x/0x%x/0x%x, "
244 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
Takashi Iwai89350642009-07-23 14:28:37 +0200245 name, (unsigned int)pos,
246 (unsigned int)runtime->period_size,
247 (unsigned int)runtime->buffer_size,
248 (unsigned long)old_hw_ptr,
249 (unsigned long)runtime->hw_ptr_base,
250 (unsigned long)runtime->hw_ptr_interrupt);
Takashi Iwaicedb8112009-07-23 11:04:13 +0200251 }
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100252 hw_base = runtime->hw_ptr_base;
253 new_hw_ptr = hw_base + pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100255 delta = new_hw_ptr - hw_ptr_interrupt;
Takashi Iwaided652f2009-03-19 10:08:49 +0100256 if (hw_ptr_interrupt >= runtime->boundary) {
Takashi Iwai8b22d942009-03-20 16:26:15 +0100257 hw_ptr_interrupt -= runtime->boundary;
258 if (hw_base < runtime->boundary / 2)
259 /* hw_base was already lapped; recalc delta */
Takashi Iwaided652f2009-03-19 10:08:49 +0100260 delta = new_hw_ptr - hw_ptr_interrupt;
261 }
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100262 if (delta < 0) {
Takashi Iwai947ca212009-07-23 16:21:08 +0200263 if (runtime->periods == 1 || new_hw_ptr < old_hw_ptr)
Takashi Iwai79452f02009-07-22 12:51:51 +0200264 delta += runtime->buffer_size;
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100265 if (delta < 0) {
266 hw_ptr_error(substream,
267 "Unexpected hw_pointer value "
268 "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
269 substream->stream, (long)pos,
270 (long)hw_ptr_interrupt);
Takashi Iwai79452f02009-07-22 12:51:51 +0200271#if 1
272 /* simply skipping the hwptr update seems more
273 * robust in some cases, e.g. on VMware with
274 * inaccurate timer source
275 */
276 return 0; /* skip this update */
277#else
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100278 /* rebase to interrupt position */
279 hw_base = new_hw_ptr = hw_ptr_interrupt;
Takashi Iwaided652f2009-03-19 10:08:49 +0100280 /* align hw_base to buffer_size */
281 hw_base -= hw_base % runtime->buffer_size;
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100282 delta = 0;
Takashi Iwai79452f02009-07-22 12:51:51 +0200283#endif
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100284 } else {
285 hw_base += runtime->buffer_size;
Takashi Iwai8b22d942009-03-20 16:26:15 +0100286 if (hw_base >= runtime->boundary)
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100287 hw_base = 0;
288 new_hw_ptr = hw_base + pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
Takashi Iwaic87d9732009-05-27 10:53:33 +0200291
292 /* Do jiffies check only in xrun_debug mode */
Jaroslav Kyselac62a01a2009-05-28 11:21:52 +0200293 if (!xrun_debug(substream, 4))
Takashi Iwaic87d9732009-05-27 10:53:33 +0200294 goto no_jiffies_check;
295
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200296 /* Skip the jiffies check for hardwares with BATCH flag.
297 * Such hardware usually just increases the position at each IRQ,
298 * thus it can't give any strange position.
299 */
300 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
301 goto no_jiffies_check;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200302 hdelta = new_hw_ptr - old_hw_ptr;
Jaroslav Kyselaa4444da2009-05-28 12:31:56 +0200303 if (hdelta < runtime->delay)
304 goto no_jiffies_check;
305 hdelta -= runtime->delay;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200306 jdelta = jiffies - runtime->hw_ptr_jiffies;
307 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
308 delta = jdelta /
309 (((runtime->period_size * HZ) / runtime->rate)
310 + HZ/100);
311 hw_ptr_error(substream,
312 "hw_ptr skipping! [Q] "
313 "(pos=%ld, delta=%ld, period=%ld, "
314 "jdelta=%lu/%lu/%lu)\n",
315 (long)pos, (long)hdelta,
316 (long)runtime->period_size, jdelta,
317 ((hdelta * HZ) / runtime->rate), delta);
318 hw_ptr_interrupt = runtime->hw_ptr_interrupt +
319 runtime->period_size * delta;
320 if (hw_ptr_interrupt >= runtime->boundary)
321 hw_ptr_interrupt -= runtime->boundary;
322 /* rebase to interrupt position */
323 hw_base = new_hw_ptr = hw_ptr_interrupt;
324 /* align hw_base to buffer_size */
325 hw_base -= hw_base % runtime->buffer_size;
326 delta = 0;
327 }
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200328 no_jiffies_check:
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200329 if (delta > runtime->period_size + runtime->period_size / 2) {
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100330 hw_ptr_error(substream,
331 "Lost interrupts? "
332 "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
333 substream->stream, (long)delta,
334 (long)hw_ptr_interrupt);
335 /* rebase hw_ptr_interrupt */
336 hw_ptr_interrupt =
337 new_hw_ptr - new_hw_ptr % runtime->period_size;
338 }
Takashi Iwaiab1863f2009-06-07 12:09:17 +0200339 runtime->hw_ptr_interrupt = hw_ptr_interrupt;
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
342 runtime->silence_size > 0)
343 snd_pcm_playback_silence(substream, new_hw_ptr);
344
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200345 if (runtime->status->hw_ptr == new_hw_ptr)
346 return 0;
347
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100348 runtime->hw_ptr_base = hw_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 runtime->status->hw_ptr = new_hw_ptr;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200350 runtime->hw_ptr_jiffies = jiffies;
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200351 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
352 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354 return snd_pcm_update_hw_ptr_post(substream, runtime);
355}
356
357/* CAUTION: call it with irq disabled */
Takashi Iwai877211f2005-11-17 13:59:38 +0100358int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Takashi Iwai877211f2005-11-17 13:59:38 +0100360 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 snd_pcm_uframes_t pos;
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100362 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 snd_pcm_sframes_t delta;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200364 unsigned long jdelta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 old_hw_ptr = runtime->status->hw_ptr;
367 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
368 if (pos == SNDRV_PCM_POS_XRUN) {
369 xrun(substream);
370 return -EPIPE;
371 }
Takashi Iwaicedb8112009-07-23 11:04:13 +0200372 if (xrun_debug(substream, 16)) {
373 char name[16];
374 pcm_debug_name(substream, name, sizeof(name));
375 snd_printd("hw_update: %s: pos=0x%x/0x%x/0x%x, "
376 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
Takashi Iwai89350642009-07-23 14:28:37 +0200377 name, (unsigned int)pos,
378 (unsigned int)runtime->period_size,
379 (unsigned int)runtime->buffer_size,
380 (unsigned long)old_hw_ptr,
381 (unsigned long)runtime->hw_ptr_base,
382 (unsigned long)runtime->hw_ptr_interrupt);
Takashi Iwaicedb8112009-07-23 11:04:13 +0200383 }
384
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100385 hw_base = runtime->hw_ptr_base;
386 new_hw_ptr = hw_base + pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100388 delta = new_hw_ptr - old_hw_ptr;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200389 jdelta = jiffies - runtime->hw_ptr_jiffies;
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100390 if (delta < 0) {
391 delta += runtime->buffer_size;
392 if (delta < 0) {
393 hw_ptr_error(substream,
394 "Unexpected hw_pointer value [2] "
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200395 "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100396 substream->stream, (long)pos,
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200397 (long)old_hw_ptr, jdelta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return 0;
399 }
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100400 hw_base += runtime->buffer_size;
Takashi Iwai8b22d942009-03-20 16:26:15 +0100401 if (hw_base >= runtime->boundary)
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100402 hw_base = 0;
403 new_hw_ptr = hw_base + pos;
404 }
Takashi Iwaic87d9732009-05-27 10:53:33 +0200405 /* Do jiffies check only in xrun_debug mode */
Jaroslav Kyselaa4444da2009-05-28 12:31:56 +0200406 if (!xrun_debug(substream, 4))
407 goto no_jiffies_check;
408 if (delta < runtime->delay)
409 goto no_jiffies_check;
410 delta -= runtime->delay;
411 if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100412 hw_ptr_error(substream,
413 "hw_ptr skipping! "
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200414 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100415 (long)pos, (long)delta,
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200416 (long)runtime->period_size, jdelta,
417 ((delta * HZ) / runtime->rate));
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100418 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 }
Jaroslav Kyselaa4444da2009-05-28 12:31:56 +0200420 no_jiffies_check:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
422 runtime->silence_size > 0)
423 snd_pcm_playback_silence(substream, new_hw_ptr);
424
Jaroslav Kyselad86bf922009-06-06 18:32:06 +0200425 if (runtime->status->hw_ptr == new_hw_ptr)
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200426 return 0;
427
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100428 runtime->hw_ptr_base = hw_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 runtime->status->hw_ptr = new_hw_ptr;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200430 runtime->hw_ptr_jiffies = jiffies;
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200431 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
432 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 return snd_pcm_update_hw_ptr_post(substream, runtime);
435}
436
437/**
438 * snd_pcm_set_ops - set the PCM operators
439 * @pcm: the pcm instance
440 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
441 * @ops: the operator table
442 *
443 * Sets the given PCM operators to the pcm instance.
444 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100445void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Takashi Iwai877211f2005-11-17 13:59:38 +0100447 struct snd_pcm_str *stream = &pcm->streams[direction];
448 struct snd_pcm_substream *substream;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 for (substream = stream->substream; substream != NULL; substream = substream->next)
451 substream->ops = ops;
452}
453
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200454EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456/**
457 * snd_pcm_sync - set the PCM sync id
458 * @substream: the pcm substream
459 *
460 * Sets the PCM sync identifier for the card.
461 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100462void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
Takashi Iwai877211f2005-11-17 13:59:38 +0100464 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 runtime->sync.id32[0] = substream->pcm->card->number;
467 runtime->sync.id32[1] = -1;
468 runtime->sync.id32[2] = -1;
469 runtime->sync.id32[3] = -1;
470}
471
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200472EXPORT_SYMBOL(snd_pcm_set_sync);
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474/*
475 * Standard ioctl routine
476 */
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478static inline unsigned int div32(unsigned int a, unsigned int b,
479 unsigned int *r)
480{
481 if (b == 0) {
482 *r = 0;
483 return UINT_MAX;
484 }
485 *r = a % b;
486 return a / b;
487}
488
489static inline unsigned int div_down(unsigned int a, unsigned int b)
490{
491 if (b == 0)
492 return UINT_MAX;
493 return a / b;
494}
495
496static inline unsigned int div_up(unsigned int a, unsigned int b)
497{
498 unsigned int r;
499 unsigned int q;
500 if (b == 0)
501 return UINT_MAX;
502 q = div32(a, b, &r);
503 if (r)
504 ++q;
505 return q;
506}
507
508static inline unsigned int mul(unsigned int a, unsigned int b)
509{
510 if (a == 0)
511 return 0;
512 if (div_down(UINT_MAX, a) < b)
513 return UINT_MAX;
514 return a * b;
515}
516
517static inline unsigned int muldiv32(unsigned int a, unsigned int b,
518 unsigned int c, unsigned int *r)
519{
520 u_int64_t n = (u_int64_t) a * b;
521 if (c == 0) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200522 snd_BUG_ON(!n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 *r = 0;
524 return UINT_MAX;
525 }
Takashi Iwai3f7440a2009-06-05 17:40:04 +0200526 n = div_u64_rem(n, c, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (n >= UINT_MAX) {
528 *r = 0;
529 return UINT_MAX;
530 }
531 return n;
532}
533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534/**
535 * snd_interval_refine - refine the interval value of configurator
536 * @i: the interval value to refine
537 * @v: the interval value to refer to
538 *
539 * Refines the interval value with the reference value.
540 * The interval is changed to the range satisfying both intervals.
541 * The interval status (min, max, integer, etc.) are evaluated.
542 *
543 * Returns non-zero if the value is changed, zero if not changed.
544 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100545int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546{
547 int changed = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200548 if (snd_BUG_ON(snd_interval_empty(i)))
549 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (i->min < v->min) {
551 i->min = v->min;
552 i->openmin = v->openmin;
553 changed = 1;
554 } else if (i->min == v->min && !i->openmin && v->openmin) {
555 i->openmin = 1;
556 changed = 1;
557 }
558 if (i->max > v->max) {
559 i->max = v->max;
560 i->openmax = v->openmax;
561 changed = 1;
562 } else if (i->max == v->max && !i->openmax && v->openmax) {
563 i->openmax = 1;
564 changed = 1;
565 }
566 if (!i->integer && v->integer) {
567 i->integer = 1;
568 changed = 1;
569 }
570 if (i->integer) {
571 if (i->openmin) {
572 i->min++;
573 i->openmin = 0;
574 }
575 if (i->openmax) {
576 i->max--;
577 i->openmax = 0;
578 }
579 } else if (!i->openmin && !i->openmax && i->min == i->max)
580 i->integer = 1;
581 if (snd_interval_checkempty(i)) {
582 snd_interval_none(i);
583 return -EINVAL;
584 }
585 return changed;
586}
587
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200588EXPORT_SYMBOL(snd_interval_refine);
589
Takashi Iwai877211f2005-11-17 13:59:38 +0100590static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200592 if (snd_BUG_ON(snd_interval_empty(i)))
593 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (snd_interval_single(i))
595 return 0;
596 i->max = i->min;
597 i->openmax = i->openmin;
598 if (i->openmax)
599 i->max++;
600 return 1;
601}
602
Takashi Iwai877211f2005-11-17 13:59:38 +0100603static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200605 if (snd_BUG_ON(snd_interval_empty(i)))
606 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (snd_interval_single(i))
608 return 0;
609 i->min = i->max;
610 i->openmin = i->openmax;
611 if (i->openmin)
612 i->min--;
613 return 1;
614}
615
Takashi Iwai877211f2005-11-17 13:59:38 +0100616void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
618 if (a->empty || b->empty) {
619 snd_interval_none(c);
620 return;
621 }
622 c->empty = 0;
623 c->min = mul(a->min, b->min);
624 c->openmin = (a->openmin || b->openmin);
625 c->max = mul(a->max, b->max);
626 c->openmax = (a->openmax || b->openmax);
627 c->integer = (a->integer && b->integer);
628}
629
630/**
631 * snd_interval_div - refine the interval value with division
Takashi Iwaidf8db932005-09-07 13:38:19 +0200632 * @a: dividend
633 * @b: divisor
634 * @c: quotient
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 *
636 * c = a / b
637 *
638 * Returns non-zero if the value is changed, zero if not changed.
639 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100640void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
642 unsigned int r;
643 if (a->empty || b->empty) {
644 snd_interval_none(c);
645 return;
646 }
647 c->empty = 0;
648 c->min = div32(a->min, b->max, &r);
649 c->openmin = (r || a->openmin || b->openmax);
650 if (b->min > 0) {
651 c->max = div32(a->max, b->min, &r);
652 if (r) {
653 c->max++;
654 c->openmax = 1;
655 } else
656 c->openmax = (a->openmax || b->openmin);
657 } else {
658 c->max = UINT_MAX;
659 c->openmax = 0;
660 }
661 c->integer = 0;
662}
663
664/**
665 * snd_interval_muldivk - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200666 * @a: dividend 1
667 * @b: dividend 2
668 * @k: divisor (as integer)
669 * @c: result
670 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 * c = a * b / k
672 *
673 * Returns non-zero if the value is changed, zero if not changed.
674 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100675void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
676 unsigned int k, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677{
678 unsigned int r;
679 if (a->empty || b->empty) {
680 snd_interval_none(c);
681 return;
682 }
683 c->empty = 0;
684 c->min = muldiv32(a->min, b->min, k, &r);
685 c->openmin = (r || a->openmin || b->openmin);
686 c->max = muldiv32(a->max, b->max, k, &r);
687 if (r) {
688 c->max++;
689 c->openmax = 1;
690 } else
691 c->openmax = (a->openmax || b->openmax);
692 c->integer = 0;
693}
694
695/**
696 * snd_interval_mulkdiv - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200697 * @a: dividend 1
698 * @k: dividend 2 (as integer)
699 * @b: divisor
700 * @c: result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 *
702 * c = a * k / b
703 *
704 * Returns non-zero if the value is changed, zero if not changed.
705 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100706void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
707 const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
709 unsigned int r;
710 if (a->empty || b->empty) {
711 snd_interval_none(c);
712 return;
713 }
714 c->empty = 0;
715 c->min = muldiv32(a->min, k, b->max, &r);
716 c->openmin = (r || a->openmin || b->openmax);
717 if (b->min > 0) {
718 c->max = muldiv32(a->max, k, b->min, &r);
719 if (r) {
720 c->max++;
721 c->openmax = 1;
722 } else
723 c->openmax = (a->openmax || b->openmin);
724 } else {
725 c->max = UINT_MAX;
726 c->openmax = 0;
727 }
728 c->integer = 0;
729}
730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731/* ---- */
732
733
734/**
735 * snd_interval_ratnum - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200736 * @i: interval to refine
737 * @rats_count: number of ratnum_t
738 * @rats: ratnum_t array
739 * @nump: pointer to store the resultant numerator
740 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 *
742 * Returns non-zero if the value is changed, zero if not changed.
743 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100744int snd_interval_ratnum(struct snd_interval *i,
745 unsigned int rats_count, struct snd_ratnum *rats,
746 unsigned int *nump, unsigned int *denp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
748 unsigned int best_num, best_diff, best_den;
749 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100750 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 int err;
752
753 best_num = best_den = best_diff = 0;
754 for (k = 0; k < rats_count; ++k) {
755 unsigned int num = rats[k].num;
756 unsigned int den;
757 unsigned int q = i->min;
758 int diff;
759 if (q == 0)
760 q = 1;
761 den = div_down(num, q);
762 if (den < rats[k].den_min)
763 continue;
764 if (den > rats[k].den_max)
765 den = rats[k].den_max;
766 else {
767 unsigned int r;
768 r = (den - rats[k].den_min) % rats[k].den_step;
769 if (r != 0)
770 den -= r;
771 }
772 diff = num - q * den;
773 if (best_num == 0 ||
774 diff * best_den < best_diff * den) {
775 best_diff = diff;
776 best_den = den;
777 best_num = num;
778 }
779 }
780 if (best_den == 0) {
781 i->empty = 1;
782 return -EINVAL;
783 }
784 t.min = div_down(best_num, best_den);
785 t.openmin = !!(best_num % best_den);
786
787 best_num = best_den = best_diff = 0;
788 for (k = 0; k < rats_count; ++k) {
789 unsigned int num = rats[k].num;
790 unsigned int den;
791 unsigned int q = i->max;
792 int diff;
793 if (q == 0) {
794 i->empty = 1;
795 return -EINVAL;
796 }
797 den = div_up(num, q);
798 if (den > rats[k].den_max)
799 continue;
800 if (den < rats[k].den_min)
801 den = rats[k].den_min;
802 else {
803 unsigned int r;
804 r = (den - rats[k].den_min) % rats[k].den_step;
805 if (r != 0)
806 den += rats[k].den_step - r;
807 }
808 diff = q * den - num;
809 if (best_num == 0 ||
810 diff * best_den < best_diff * den) {
811 best_diff = diff;
812 best_den = den;
813 best_num = num;
814 }
815 }
816 if (best_den == 0) {
817 i->empty = 1;
818 return -EINVAL;
819 }
820 t.max = div_up(best_num, best_den);
821 t.openmax = !!(best_num % best_den);
822 t.integer = 0;
823 err = snd_interval_refine(i, &t);
824 if (err < 0)
825 return err;
826
827 if (snd_interval_single(i)) {
828 if (nump)
829 *nump = best_num;
830 if (denp)
831 *denp = best_den;
832 }
833 return err;
834}
835
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200836EXPORT_SYMBOL(snd_interval_ratnum);
837
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838/**
839 * snd_interval_ratden - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200840 * @i: interval to refine
Takashi Iwai877211f2005-11-17 13:59:38 +0100841 * @rats_count: number of struct ratden
842 * @rats: struct ratden array
Takashi Iwaidf8db932005-09-07 13:38:19 +0200843 * @nump: pointer to store the resultant numerator
844 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 *
846 * Returns non-zero if the value is changed, zero if not changed.
847 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100848static int snd_interval_ratden(struct snd_interval *i,
849 unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 unsigned int *nump, unsigned int *denp)
851{
852 unsigned int best_num, best_diff, best_den;
853 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100854 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 int err;
856
857 best_num = best_den = best_diff = 0;
858 for (k = 0; k < rats_count; ++k) {
859 unsigned int num;
860 unsigned int den = rats[k].den;
861 unsigned int q = i->min;
862 int diff;
863 num = mul(q, den);
864 if (num > rats[k].num_max)
865 continue;
866 if (num < rats[k].num_min)
867 num = rats[k].num_max;
868 else {
869 unsigned int r;
870 r = (num - rats[k].num_min) % rats[k].num_step;
871 if (r != 0)
872 num += rats[k].num_step - r;
873 }
874 diff = num - q * den;
875 if (best_num == 0 ||
876 diff * best_den < best_diff * den) {
877 best_diff = diff;
878 best_den = den;
879 best_num = num;
880 }
881 }
882 if (best_den == 0) {
883 i->empty = 1;
884 return -EINVAL;
885 }
886 t.min = div_down(best_num, best_den);
887 t.openmin = !!(best_num % best_den);
888
889 best_num = best_den = best_diff = 0;
890 for (k = 0; k < rats_count; ++k) {
891 unsigned int num;
892 unsigned int den = rats[k].den;
893 unsigned int q = i->max;
894 int diff;
895 num = mul(q, den);
896 if (num < rats[k].num_min)
897 continue;
898 if (num > rats[k].num_max)
899 num = rats[k].num_max;
900 else {
901 unsigned int r;
902 r = (num - rats[k].num_min) % rats[k].num_step;
903 if (r != 0)
904 num -= r;
905 }
906 diff = q * den - num;
907 if (best_num == 0 ||
908 diff * best_den < best_diff * den) {
909 best_diff = diff;
910 best_den = den;
911 best_num = num;
912 }
913 }
914 if (best_den == 0) {
915 i->empty = 1;
916 return -EINVAL;
917 }
918 t.max = div_up(best_num, best_den);
919 t.openmax = !!(best_num % best_den);
920 t.integer = 0;
921 err = snd_interval_refine(i, &t);
922 if (err < 0)
923 return err;
924
925 if (snd_interval_single(i)) {
926 if (nump)
927 *nump = best_num;
928 if (denp)
929 *denp = best_den;
930 }
931 return err;
932}
933
934/**
935 * snd_interval_list - refine the interval value from the list
936 * @i: the interval value to refine
937 * @count: the number of elements in the list
938 * @list: the value list
939 * @mask: the bit-mask to evaluate
940 *
941 * Refines the interval value from the list.
942 * When mask is non-zero, only the elements corresponding to bit 1 are
943 * evaluated.
944 *
945 * Returns non-zero if the value is changed, zero if not changed.
946 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100947int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948{
949 unsigned int k;
950 int changed = 0;
Takashi Iwai0981a262007-02-01 14:53:49 +0100951
952 if (!count) {
953 i->empty = 1;
954 return -EINVAL;
955 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 for (k = 0; k < count; k++) {
957 if (mask && !(mask & (1 << k)))
958 continue;
959 if (i->min == list[k] && !i->openmin)
960 goto _l1;
961 if (i->min < list[k]) {
962 i->min = list[k];
963 i->openmin = 0;
964 changed = 1;
965 goto _l1;
966 }
967 }
968 i->empty = 1;
969 return -EINVAL;
970 _l1:
971 for (k = count; k-- > 0;) {
972 if (mask && !(mask & (1 << k)))
973 continue;
974 if (i->max == list[k] && !i->openmax)
975 goto _l2;
976 if (i->max > list[k]) {
977 i->max = list[k];
978 i->openmax = 0;
979 changed = 1;
980 goto _l2;
981 }
982 }
983 i->empty = 1;
984 return -EINVAL;
985 _l2:
986 if (snd_interval_checkempty(i)) {
987 i->empty = 1;
988 return -EINVAL;
989 }
990 return changed;
991}
992
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200993EXPORT_SYMBOL(snd_interval_list);
994
Takashi Iwai877211f2005-11-17 13:59:38 +0100995static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
997 unsigned int n;
998 int changed = 0;
999 n = (i->min - min) % step;
1000 if (n != 0 || i->openmin) {
1001 i->min += step - n;
1002 changed = 1;
1003 }
1004 n = (i->max - min) % step;
1005 if (n != 0 || i->openmax) {
1006 i->max -= n;
1007 changed = 1;
1008 }
1009 if (snd_interval_checkempty(i)) {
1010 i->empty = 1;
1011 return -EINVAL;
1012 }
1013 return changed;
1014}
1015
1016/* Info constraints helpers */
1017
1018/**
1019 * snd_pcm_hw_rule_add - add the hw-constraint rule
1020 * @runtime: the pcm runtime instance
1021 * @cond: condition bits
1022 * @var: the variable to evaluate
1023 * @func: the evaluation function
1024 * @private: the private data pointer passed to function
1025 * @dep: the dependent variables
1026 *
1027 * Returns zero if successful, or a negative error code on failure.
1028 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001029int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 int var,
1031 snd_pcm_hw_rule_func_t func, void *private,
1032 int dep, ...)
1033{
Takashi Iwai877211f2005-11-17 13:59:38 +01001034 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1035 struct snd_pcm_hw_rule *c;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 unsigned int k;
1037 va_list args;
1038 va_start(args, dep);
1039 if (constrs->rules_num >= constrs->rules_all) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001040 struct snd_pcm_hw_rule *new;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 unsigned int new_rules = constrs->rules_all + 16;
1042 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1043 if (!new)
1044 return -ENOMEM;
1045 if (constrs->rules) {
1046 memcpy(new, constrs->rules,
1047 constrs->rules_num * sizeof(*c));
1048 kfree(constrs->rules);
1049 }
1050 constrs->rules = new;
1051 constrs->rules_all = new_rules;
1052 }
1053 c = &constrs->rules[constrs->rules_num];
1054 c->cond = cond;
1055 c->func = func;
1056 c->var = var;
1057 c->private = private;
1058 k = 0;
1059 while (1) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001060 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1061 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 c->deps[k++] = dep;
1063 if (dep < 0)
1064 break;
1065 dep = va_arg(args, int);
1066 }
1067 constrs->rules_num++;
1068 va_end(args);
1069 return 0;
1070}
1071
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001072EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001075 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001076 * @runtime: PCM runtime instance
1077 * @var: hw_params variable to apply the mask
1078 * @mask: the bitmap mask
1079 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001080 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001082int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 u_int32_t mask)
1084{
Takashi Iwai877211f2005-11-17 13:59:38 +01001085 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1086 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 *maskp->bits &= mask;
1088 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1089 if (*maskp->bits == 0)
1090 return -EINVAL;
1091 return 0;
1092}
1093
1094/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001095 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001096 * @runtime: PCM runtime instance
1097 * @var: hw_params variable to apply the mask
1098 * @mask: the 64bit bitmap mask
1099 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001100 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001102int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 u_int64_t mask)
1104{
Takashi Iwai877211f2005-11-17 13:59:38 +01001105 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1106 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 maskp->bits[0] &= (u_int32_t)mask;
1108 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1109 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1110 if (! maskp->bits[0] && ! maskp->bits[1])
1111 return -EINVAL;
1112 return 0;
1113}
1114
1115/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001116 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001117 * @runtime: PCM runtime instance
1118 * @var: hw_params variable to apply the integer constraint
1119 *
1120 * Apply the constraint of integer to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001122int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123{
Takashi Iwai877211f2005-11-17 13:59:38 +01001124 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 return snd_interval_setinteger(constrs_interval(constrs, var));
1126}
1127
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001128EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001131 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001132 * @runtime: PCM runtime instance
1133 * @var: hw_params variable to apply the range
1134 * @min: the minimal value
1135 * @max: the maximal value
1136 *
1137 * Apply the min/max range constraint to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001139int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 unsigned int min, unsigned int max)
1141{
Takashi Iwai877211f2005-11-17 13:59:38 +01001142 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1143 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 t.min = min;
1145 t.max = max;
1146 t.openmin = t.openmax = 0;
1147 t.integer = 0;
1148 return snd_interval_refine(constrs_interval(constrs, var), &t);
1149}
1150
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001151EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1152
Takashi Iwai877211f2005-11-17 13:59:38 +01001153static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1154 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155{
Takashi Iwai877211f2005-11-17 13:59:38 +01001156 struct snd_pcm_hw_constraint_list *list = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1158}
1159
1160
1161/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001162 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001163 * @runtime: PCM runtime instance
1164 * @cond: condition bits
1165 * @var: hw_params variable to apply the list constraint
1166 * @l: list
1167 *
1168 * Apply the list of constraints to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001170int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 unsigned int cond,
1172 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001173 struct snd_pcm_hw_constraint_list *l)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174{
1175 return snd_pcm_hw_rule_add(runtime, cond, var,
1176 snd_pcm_hw_rule_list, l,
1177 var, -1);
1178}
1179
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001180EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1181
Takashi Iwai877211f2005-11-17 13:59:38 +01001182static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1183 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184{
Takashi Iwai877211f2005-11-17 13:59:38 +01001185 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 unsigned int num = 0, den = 0;
1187 int err;
1188 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1189 r->nrats, r->rats, &num, &den);
1190 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1191 params->rate_num = num;
1192 params->rate_den = den;
1193 }
1194 return err;
1195}
1196
1197/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001198 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001199 * @runtime: PCM runtime instance
1200 * @cond: condition bits
1201 * @var: hw_params variable to apply the ratnums constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001202 * @r: struct snd_ratnums constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001204int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 unsigned int cond,
1206 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001207 struct snd_pcm_hw_constraint_ratnums *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208{
1209 return snd_pcm_hw_rule_add(runtime, cond, var,
1210 snd_pcm_hw_rule_ratnums, r,
1211 var, -1);
1212}
1213
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001214EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1215
Takashi Iwai877211f2005-11-17 13:59:38 +01001216static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1217 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218{
Takashi Iwai877211f2005-11-17 13:59:38 +01001219 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 unsigned int num = 0, den = 0;
1221 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1222 r->nrats, r->rats, &num, &den);
1223 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1224 params->rate_num = num;
1225 params->rate_den = den;
1226 }
1227 return err;
1228}
1229
1230/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001231 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001232 * @runtime: PCM runtime instance
1233 * @cond: condition bits
1234 * @var: hw_params variable to apply the ratdens constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001235 * @r: struct snd_ratdens constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001237int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 unsigned int cond,
1239 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001240 struct snd_pcm_hw_constraint_ratdens *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241{
1242 return snd_pcm_hw_rule_add(runtime, cond, var,
1243 snd_pcm_hw_rule_ratdens, r,
1244 var, -1);
1245}
1246
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001247EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1248
Takashi Iwai877211f2005-11-17 13:59:38 +01001249static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1250 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251{
1252 unsigned int l = (unsigned long) rule->private;
1253 int width = l & 0xffff;
1254 unsigned int msbits = l >> 16;
Takashi Iwai877211f2005-11-17 13:59:38 +01001255 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (snd_interval_single(i) && snd_interval_value(i) == width)
1257 params->msbits = msbits;
1258 return 0;
1259}
1260
1261/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001262 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001263 * @runtime: PCM runtime instance
1264 * @cond: condition bits
1265 * @width: sample bits width
1266 * @msbits: msbits width
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001268int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 unsigned int cond,
1270 unsigned int width,
1271 unsigned int msbits)
1272{
1273 unsigned long l = (msbits << 16) | width;
1274 return snd_pcm_hw_rule_add(runtime, cond, -1,
1275 snd_pcm_hw_rule_msbits,
1276 (void*) l,
1277 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1278}
1279
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001280EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1281
Takashi Iwai877211f2005-11-17 13:59:38 +01001282static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1283 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284{
1285 unsigned long step = (unsigned long) rule->private;
1286 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1287}
1288
1289/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001290 * snd_pcm_hw_constraint_step - add a hw constraint step rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001291 * @runtime: PCM runtime instance
1292 * @cond: condition bits
1293 * @var: hw_params variable to apply the step constraint
1294 * @step: step size
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001296int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 unsigned int cond,
1298 snd_pcm_hw_param_t var,
1299 unsigned long step)
1300{
1301 return snd_pcm_hw_rule_add(runtime, cond, var,
1302 snd_pcm_hw_rule_step, (void *) step,
1303 var, -1);
1304}
1305
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001306EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1307
Takashi Iwai877211f2005-11-17 13:59:38 +01001308static 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 -07001309{
Marcin Åšlusarz67c39312007-12-14 12:53:21 +01001310 static unsigned int pow2_sizes[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1312 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1313 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1314 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1315 };
1316 return snd_interval_list(hw_param_interval(params, rule->var),
1317 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1318}
1319
1320/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001321 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001322 * @runtime: PCM runtime instance
1323 * @cond: condition bits
1324 * @var: hw_params variable to apply the power-of-2 constraint
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001326int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 unsigned int cond,
1328 snd_pcm_hw_param_t var)
1329{
1330 return snd_pcm_hw_rule_add(runtime, cond, var,
1331 snd_pcm_hw_rule_pow2, NULL,
1332 var, -1);
1333}
1334
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001335EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1336
Takashi Iwai877211f2005-11-17 13:59:38 +01001337static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001338 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339{
1340 if (hw_is_mask(var)) {
1341 snd_mask_any(hw_param_mask(params, var));
1342 params->cmask |= 1 << var;
1343 params->rmask |= 1 << var;
1344 return;
1345 }
1346 if (hw_is_interval(var)) {
1347 snd_interval_any(hw_param_interval(params, var));
1348 params->cmask |= 1 << var;
1349 params->rmask |= 1 << var;
1350 return;
1351 }
1352 snd_BUG();
1353}
1354
Takashi Iwai877211f2005-11-17 13:59:38 +01001355void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356{
1357 unsigned int k;
1358 memset(params, 0, sizeof(*params));
1359 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1360 _snd_pcm_hw_param_any(params, k);
1361 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1362 _snd_pcm_hw_param_any(params, k);
1363 params->info = ~0U;
1364}
1365
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001366EXPORT_SYMBOL(_snd_pcm_hw_params_any);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001369 * snd_pcm_hw_param_value - return @params field @var value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001370 * @params: the hw_params instance
1371 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001372 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001374 * Return the value for field @var if it's fixed in configuration space
1375 * defined by @params. Return -%EINVAL otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001377int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1378 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379{
1380 if (hw_is_mask(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001381 const struct snd_mask *mask = hw_param_mask_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 if (!snd_mask_single(mask))
1383 return -EINVAL;
1384 if (dir)
1385 *dir = 0;
1386 return snd_mask_value(mask);
1387 }
1388 if (hw_is_interval(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001389 const struct snd_interval *i = hw_param_interval_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 if (!snd_interval_single(i))
1391 return -EINVAL;
1392 if (dir)
1393 *dir = i->openmin;
1394 return snd_interval_value(i);
1395 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 return -EINVAL;
1397}
1398
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001399EXPORT_SYMBOL(snd_pcm_hw_param_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
Takashi Iwai877211f2005-11-17 13:59:38 +01001401void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 snd_pcm_hw_param_t var)
1403{
1404 if (hw_is_mask(var)) {
1405 snd_mask_none(hw_param_mask(params, var));
1406 params->cmask |= 1 << var;
1407 params->rmask |= 1 << var;
1408 } else if (hw_is_interval(var)) {
1409 snd_interval_none(hw_param_interval(params, var));
1410 params->cmask |= 1 << var;
1411 params->rmask |= 1 << var;
1412 } else {
1413 snd_BUG();
1414 }
1415}
1416
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001417EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Takashi Iwai877211f2005-11-17 13:59:38 +01001419static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001420 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421{
1422 int changed;
1423 if (hw_is_mask(var))
1424 changed = snd_mask_refine_first(hw_param_mask(params, var));
1425 else if (hw_is_interval(var))
1426 changed = snd_interval_refine_first(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001427 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 if (changed) {
1430 params->cmask |= 1 << var;
1431 params->rmask |= 1 << var;
1432 }
1433 return changed;
1434}
1435
1436
1437/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001438 * snd_pcm_hw_param_first - refine config space and return minimum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001439 * @pcm: PCM instance
1440 * @params: the hw_params instance
1441 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001442 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001444 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 * values > minimum. Reduce configuration space accordingly.
1446 * Return the minimum.
1447 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001448int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1449 struct snd_pcm_hw_params *params,
1450 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451{
1452 int changed = _snd_pcm_hw_param_first(params, var);
1453 if (changed < 0)
1454 return changed;
1455 if (params->rmask) {
1456 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001457 if (snd_BUG_ON(err < 0))
1458 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 }
1460 return snd_pcm_hw_param_value(params, var, dir);
1461}
1462
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001463EXPORT_SYMBOL(snd_pcm_hw_param_first);
1464
Takashi Iwai877211f2005-11-17 13:59:38 +01001465static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001466 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467{
1468 int changed;
1469 if (hw_is_mask(var))
1470 changed = snd_mask_refine_last(hw_param_mask(params, var));
1471 else if (hw_is_interval(var))
1472 changed = snd_interval_refine_last(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001473 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 if (changed) {
1476 params->cmask |= 1 << var;
1477 params->rmask |= 1 << var;
1478 }
1479 return changed;
1480}
1481
1482
1483/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001484 * snd_pcm_hw_param_last - refine config space and return maximum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001485 * @pcm: PCM instance
1486 * @params: the hw_params instance
1487 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001488 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001490 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 * values < maximum. Reduce configuration space accordingly.
1492 * Return the maximum.
1493 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001494int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1495 struct snd_pcm_hw_params *params,
1496 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497{
1498 int changed = _snd_pcm_hw_param_last(params, var);
1499 if (changed < 0)
1500 return changed;
1501 if (params->rmask) {
1502 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001503 if (snd_BUG_ON(err < 0))
1504 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 }
1506 return snd_pcm_hw_param_value(params, var, dir);
1507}
1508
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001509EXPORT_SYMBOL(snd_pcm_hw_param_last);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
1511/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001512 * snd_pcm_hw_param_choose - choose a configuration defined by @params
Takashi Iwaidf8db932005-09-07 13:38:19 +02001513 * @pcm: PCM instance
1514 * @params: the hw_params instance
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001516 * Choose one configuration from configuration space defined by @params.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 * The configuration chosen is that obtained fixing in this order:
1518 * first access, first format, first subformat, min channels,
1519 * min rate, min period time, max buffer size, min tick time
1520 */
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001521int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1522 struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523{
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001524 static int vars[] = {
1525 SNDRV_PCM_HW_PARAM_ACCESS,
1526 SNDRV_PCM_HW_PARAM_FORMAT,
1527 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1528 SNDRV_PCM_HW_PARAM_CHANNELS,
1529 SNDRV_PCM_HW_PARAM_RATE,
1530 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1531 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1532 SNDRV_PCM_HW_PARAM_TICK_TIME,
1533 -1
1534 };
1535 int err, *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001537 for (v = vars; *v != -1; v++) {
1538 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1539 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1540 else
1541 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001542 if (snd_BUG_ON(err < 0))
1543 return err;
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 return 0;
1546}
1547
Takashi Iwai877211f2005-11-17 13:59:38 +01001548static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 void *arg)
1550{
Takashi Iwai877211f2005-11-17 13:59:38 +01001551 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 unsigned long flags;
1553 snd_pcm_stream_lock_irqsave(substream, flags);
1554 if (snd_pcm_running(substream) &&
1555 snd_pcm_update_hw_ptr(substream) >= 0)
1556 runtime->status->hw_ptr %= runtime->buffer_size;
1557 else
1558 runtime->status->hw_ptr = 0;
1559 snd_pcm_stream_unlock_irqrestore(substream, flags);
1560 return 0;
1561}
1562
Takashi Iwai877211f2005-11-17 13:59:38 +01001563static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 void *arg)
1565{
Takashi Iwai877211f2005-11-17 13:59:38 +01001566 struct snd_pcm_channel_info *info = arg;
1567 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 int width;
1569 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1570 info->offset = -1;
1571 return 0;
1572 }
1573 width = snd_pcm_format_physical_width(runtime->format);
1574 if (width < 0)
1575 return width;
1576 info->offset = 0;
1577 switch (runtime->access) {
1578 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1579 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1580 info->first = info->channel * width;
1581 info->step = runtime->channels * width;
1582 break;
1583 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1584 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1585 {
1586 size_t size = runtime->dma_bytes / runtime->channels;
1587 info->first = info->channel * size * 8;
1588 info->step = width;
1589 break;
1590 }
1591 default:
1592 snd_BUG();
1593 break;
1594 }
1595 return 0;
1596}
1597
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001598static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1599 void *arg)
1600{
1601 struct snd_pcm_hw_params *params = arg;
1602 snd_pcm_format_t format;
1603 int channels, width;
1604
1605 params->fifo_size = substream->runtime->hw.fifo_size;
1606 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1607 format = params_format(params);
1608 channels = params_channels(params);
1609 width = snd_pcm_format_physical_width(format);
1610 params->fifo_size /= width * channels;
1611 }
1612 return 0;
1613}
1614
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615/**
1616 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1617 * @substream: the pcm substream instance
1618 * @cmd: ioctl command
1619 * @arg: ioctl argument
1620 *
1621 * Processes the generic ioctl commands for PCM.
1622 * Can be passed as the ioctl callback for PCM ops.
1623 *
1624 * Returns zero if successful, or a negative error code on failure.
1625 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001626int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 unsigned int cmd, void *arg)
1628{
1629 switch (cmd) {
1630 case SNDRV_PCM_IOCTL1_INFO:
1631 return 0;
1632 case SNDRV_PCM_IOCTL1_RESET:
1633 return snd_pcm_lib_ioctl_reset(substream, arg);
1634 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1635 return snd_pcm_lib_ioctl_channel_info(substream, arg);
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001636 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1637 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 }
1639 return -ENXIO;
1640}
1641
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001642EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1643
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644/**
1645 * snd_pcm_period_elapsed - update the pcm status for the next period
1646 * @substream: the pcm substream instance
1647 *
1648 * This function is called from the interrupt handler when the
1649 * PCM has processed the period size. It will update the current
Takashi Iwai31e89602008-01-08 18:09:57 +01001650 * pointer, wake up sleepers, etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 *
1652 * Even if more than one periods have elapsed since the last call, you
1653 * have to call this only once.
1654 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001655void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656{
Takashi Iwai877211f2005-11-17 13:59:38 +01001657 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 unsigned long flags;
1659
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001660 if (PCM_RUNTIME_CHECK(substream))
1661 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663
1664 if (runtime->transfer_ack_begin)
1665 runtime->transfer_ack_begin(substream);
1666
1667 snd_pcm_stream_lock_irqsave(substream, flags);
1668 if (!snd_pcm_running(substream) ||
1669 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1670 goto _end;
1671
1672 if (substream->timer_running)
1673 snd_timer_interrupt(substream->timer, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 _end:
1675 snd_pcm_stream_unlock_irqrestore(substream, flags);
1676 if (runtime->transfer_ack_end)
1677 runtime->transfer_ack_end(substream);
1678 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1679}
1680
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001681EXPORT_SYMBOL(snd_pcm_period_elapsed);
1682
Takashi Iwai13075512008-01-08 18:08:14 +01001683/*
1684 * Wait until avail_min data becomes available
1685 * Returns a negative error code if any error occurs during operation.
1686 * The available space is stored on availp. When err = 0 and avail = 0
1687 * on the capture stream, it indicates the stream is in DRAINING state.
1688 */
1689static int wait_for_avail_min(struct snd_pcm_substream *substream,
1690 snd_pcm_uframes_t *availp)
1691{
1692 struct snd_pcm_runtime *runtime = substream->runtime;
1693 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1694 wait_queue_t wait;
1695 int err = 0;
1696 snd_pcm_uframes_t avail = 0;
1697 long tout;
1698
1699 init_waitqueue_entry(&wait, current);
1700 add_wait_queue(&runtime->sleep, &wait);
1701 for (;;) {
1702 if (signal_pending(current)) {
1703 err = -ERESTARTSYS;
1704 break;
1705 }
1706 set_current_state(TASK_INTERRUPTIBLE);
1707 snd_pcm_stream_unlock_irq(substream);
1708 tout = schedule_timeout(msecs_to_jiffies(10000));
1709 snd_pcm_stream_lock_irq(substream);
1710 switch (runtime->status->state) {
1711 case SNDRV_PCM_STATE_SUSPENDED:
1712 err = -ESTRPIPE;
1713 goto _endloop;
1714 case SNDRV_PCM_STATE_XRUN:
1715 err = -EPIPE;
1716 goto _endloop;
1717 case SNDRV_PCM_STATE_DRAINING:
1718 if (is_playback)
1719 err = -EPIPE;
1720 else
1721 avail = 0; /* indicate draining */
1722 goto _endloop;
1723 case SNDRV_PCM_STATE_OPEN:
1724 case SNDRV_PCM_STATE_SETUP:
1725 case SNDRV_PCM_STATE_DISCONNECTED:
1726 err = -EBADFD;
1727 goto _endloop;
1728 }
1729 if (!tout) {
1730 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1731 is_playback ? "playback" : "capture");
1732 err = -EIO;
1733 break;
1734 }
1735 if (is_playback)
1736 avail = snd_pcm_playback_avail(runtime);
1737 else
1738 avail = snd_pcm_capture_avail(runtime);
1739 if (avail >= runtime->control->avail_min)
1740 break;
1741 }
1742 _endloop:
1743 remove_wait_queue(&runtime->sleep, &wait);
1744 *availp = avail;
1745 return err;
1746}
1747
Takashi Iwai877211f2005-11-17 13:59:38 +01001748static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 unsigned int hwoff,
1750 unsigned long data, unsigned int off,
1751 snd_pcm_uframes_t frames)
1752{
Takashi Iwai877211f2005-11-17 13:59:38 +01001753 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 int err;
1755 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1756 if (substream->ops->copy) {
1757 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1758 return err;
1759 } else {
1760 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1762 return -EFAULT;
1763 }
1764 return 0;
1765}
1766
Takashi Iwai877211f2005-11-17 13:59:38 +01001767typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 unsigned long data, unsigned int off,
1769 snd_pcm_uframes_t size);
1770
Takashi Iwai877211f2005-11-17 13:59:38 +01001771static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 unsigned long data,
1773 snd_pcm_uframes_t size,
1774 int nonblock,
1775 transfer_f transfer)
1776{
Takashi Iwai877211f2005-11-17 13:59:38 +01001777 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 snd_pcm_uframes_t xfer = 0;
1779 snd_pcm_uframes_t offset = 0;
1780 int err = 0;
1781
1782 if (size == 0)
1783 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
1785 snd_pcm_stream_lock_irq(substream);
1786 switch (runtime->status->state) {
1787 case SNDRV_PCM_STATE_PREPARED:
1788 case SNDRV_PCM_STATE_RUNNING:
1789 case SNDRV_PCM_STATE_PAUSED:
1790 break;
1791 case SNDRV_PCM_STATE_XRUN:
1792 err = -EPIPE;
1793 goto _end_unlock;
1794 case SNDRV_PCM_STATE_SUSPENDED:
1795 err = -ESTRPIPE;
1796 goto _end_unlock;
1797 default:
1798 err = -EBADFD;
1799 goto _end_unlock;
1800 }
1801
1802 while (size > 0) {
1803 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1804 snd_pcm_uframes_t avail;
1805 snd_pcm_uframes_t cont;
Takashi Iwai31e89602008-01-08 18:09:57 +01001806 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 snd_pcm_update_hw_ptr(substream);
1808 avail = snd_pcm_playback_avail(runtime);
Takashi Iwai13075512008-01-08 18:08:14 +01001809 if (!avail) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 if (nonblock) {
1811 err = -EAGAIN;
1812 goto _end_unlock;
1813 }
Takashi Iwai13075512008-01-08 18:08:14 +01001814 err = wait_for_avail_min(substream, &avail);
1815 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 frames = size > avail ? avail : size;
1819 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1820 if (frames > cont)
1821 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001822 if (snd_BUG_ON(!frames)) {
1823 snd_pcm_stream_unlock_irq(substream);
1824 return -EINVAL;
1825 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 appl_ptr = runtime->control->appl_ptr;
1827 appl_ofs = appl_ptr % runtime->buffer_size;
1828 snd_pcm_stream_unlock_irq(substream);
1829 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1830 goto _end;
1831 snd_pcm_stream_lock_irq(substream);
1832 switch (runtime->status->state) {
1833 case SNDRV_PCM_STATE_XRUN:
1834 err = -EPIPE;
1835 goto _end_unlock;
1836 case SNDRV_PCM_STATE_SUSPENDED:
1837 err = -ESTRPIPE;
1838 goto _end_unlock;
1839 default:
1840 break;
1841 }
1842 appl_ptr += frames;
1843 if (appl_ptr >= runtime->boundary)
1844 appl_ptr -= runtime->boundary;
1845 runtime->control->appl_ptr = appl_ptr;
1846 if (substream->ops->ack)
1847 substream->ops->ack(substream);
1848
1849 offset += frames;
1850 size -= frames;
1851 xfer += frames;
1852 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1853 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1854 err = snd_pcm_start(substream);
1855 if (err < 0)
1856 goto _end_unlock;
1857 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 }
1859 _end_unlock:
1860 snd_pcm_stream_unlock_irq(substream);
1861 _end:
1862 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1863}
1864
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001865/* sanity-check for read/write methods */
1866static int pcm_sanity_check(struct snd_pcm_substream *substream)
1867{
1868 struct snd_pcm_runtime *runtime;
1869 if (PCM_RUNTIME_CHECK(substream))
1870 return -ENXIO;
1871 runtime = substream->runtime;
1872 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1873 return -EINVAL;
1874 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1875 return -EBADFD;
1876 return 0;
1877}
1878
Takashi Iwai877211f2005-11-17 13:59:38 +01001879snd_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 -07001880{
Takashi Iwai877211f2005-11-17 13:59:38 +01001881 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001883 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001885 err = pcm_sanity_check(substream);
1886 if (err < 0)
1887 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02001889 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890
1891 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1892 runtime->channels > 1)
1893 return -EINVAL;
1894 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1895 snd_pcm_lib_write_transfer);
1896}
1897
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001898EXPORT_SYMBOL(snd_pcm_lib_write);
1899
Takashi Iwai877211f2005-11-17 13:59:38 +01001900static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 unsigned int hwoff,
1902 unsigned long data, unsigned int off,
1903 snd_pcm_uframes_t frames)
1904{
Takashi Iwai877211f2005-11-17 13:59:38 +01001905 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 int err;
1907 void __user **bufs = (void __user **)data;
1908 int channels = runtime->channels;
1909 int c;
1910 if (substream->ops->copy) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001911 if (snd_BUG_ON(!substream->ops->silence))
1912 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 for (c = 0; c < channels; ++c, ++bufs) {
1914 if (*bufs == NULL) {
1915 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1916 return err;
1917 } else {
1918 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1919 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1920 return err;
1921 }
1922 }
1923 } else {
1924 /* default transfer behaviour */
1925 size_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 for (c = 0; c < channels; ++c, ++bufs) {
1927 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1928 if (*bufs == NULL) {
1929 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1930 } else {
1931 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1932 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1933 return -EFAULT;
1934 }
1935 }
1936 }
1937 return 0;
1938}
1939
Takashi Iwai877211f2005-11-17 13:59:38 +01001940snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 void __user **bufs,
1942 snd_pcm_uframes_t frames)
1943{
Takashi Iwai877211f2005-11-17 13:59:38 +01001944 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001946 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001948 err = pcm_sanity_check(substream);
1949 if (err < 0)
1950 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02001952 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
1954 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1955 return -EINVAL;
1956 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1957 nonblock, snd_pcm_lib_writev_transfer);
1958}
1959
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001960EXPORT_SYMBOL(snd_pcm_lib_writev);
1961
Takashi Iwai877211f2005-11-17 13:59:38 +01001962static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 unsigned int hwoff,
1964 unsigned long data, unsigned int off,
1965 snd_pcm_uframes_t frames)
1966{
Takashi Iwai877211f2005-11-17 13:59:38 +01001967 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 int err;
1969 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1970 if (substream->ops->copy) {
1971 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1972 return err;
1973 } else {
1974 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1976 return -EFAULT;
1977 }
1978 return 0;
1979}
1980
Takashi Iwai877211f2005-11-17 13:59:38 +01001981static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 unsigned long data,
1983 snd_pcm_uframes_t size,
1984 int nonblock,
1985 transfer_f transfer)
1986{
Takashi Iwai877211f2005-11-17 13:59:38 +01001987 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 snd_pcm_uframes_t xfer = 0;
1989 snd_pcm_uframes_t offset = 0;
1990 int err = 0;
1991
1992 if (size == 0)
1993 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994
1995 snd_pcm_stream_lock_irq(substream);
1996 switch (runtime->status->state) {
1997 case SNDRV_PCM_STATE_PREPARED:
1998 if (size >= runtime->start_threshold) {
1999 err = snd_pcm_start(substream);
2000 if (err < 0)
2001 goto _end_unlock;
2002 }
2003 break;
2004 case SNDRV_PCM_STATE_DRAINING:
2005 case SNDRV_PCM_STATE_RUNNING:
2006 case SNDRV_PCM_STATE_PAUSED:
2007 break;
2008 case SNDRV_PCM_STATE_XRUN:
2009 err = -EPIPE;
2010 goto _end_unlock;
2011 case SNDRV_PCM_STATE_SUSPENDED:
2012 err = -ESTRPIPE;
2013 goto _end_unlock;
2014 default:
2015 err = -EBADFD;
2016 goto _end_unlock;
2017 }
2018
2019 while (size > 0) {
2020 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2021 snd_pcm_uframes_t avail;
2022 snd_pcm_uframes_t cont;
Takashi Iwai31e89602008-01-08 18:09:57 +01002023 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024 snd_pcm_update_hw_ptr(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 avail = snd_pcm_capture_avail(runtime);
Takashi Iwai13075512008-01-08 18:08:14 +01002026 if (!avail) {
2027 if (runtime->status->state ==
2028 SNDRV_PCM_STATE_DRAINING) {
2029 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 goto _end_unlock;
2031 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 if (nonblock) {
2033 err = -EAGAIN;
2034 goto _end_unlock;
2035 }
Takashi Iwai13075512008-01-08 18:08:14 +01002036 err = wait_for_avail_min(substream, &avail);
2037 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 goto _end_unlock;
Takashi Iwai13075512008-01-08 18:08:14 +01002039 if (!avail)
2040 continue; /* draining */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 frames = size > avail ? avail : size;
2043 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2044 if (frames > cont)
2045 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002046 if (snd_BUG_ON(!frames)) {
2047 snd_pcm_stream_unlock_irq(substream);
2048 return -EINVAL;
2049 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 appl_ptr = runtime->control->appl_ptr;
2051 appl_ofs = appl_ptr % runtime->buffer_size;
2052 snd_pcm_stream_unlock_irq(substream);
2053 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2054 goto _end;
2055 snd_pcm_stream_lock_irq(substream);
2056 switch (runtime->status->state) {
2057 case SNDRV_PCM_STATE_XRUN:
2058 err = -EPIPE;
2059 goto _end_unlock;
2060 case SNDRV_PCM_STATE_SUSPENDED:
2061 err = -ESTRPIPE;
2062 goto _end_unlock;
2063 default:
2064 break;
2065 }
2066 appl_ptr += frames;
2067 if (appl_ptr >= runtime->boundary)
2068 appl_ptr -= runtime->boundary;
2069 runtime->control->appl_ptr = appl_ptr;
2070 if (substream->ops->ack)
2071 substream->ops->ack(substream);
2072
2073 offset += frames;
2074 size -= frames;
2075 xfer += frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076 }
2077 _end_unlock:
2078 snd_pcm_stream_unlock_irq(substream);
2079 _end:
2080 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2081}
2082
Takashi Iwai877211f2005-11-17 13:59:38 +01002083snd_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 -07002084{
Takashi Iwai877211f2005-11-17 13:59:38 +01002085 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002087 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002089 err = pcm_sanity_check(substream);
2090 if (err < 0)
2091 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02002093 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2095 return -EINVAL;
2096 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2097}
2098
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02002099EXPORT_SYMBOL(snd_pcm_lib_read);
2100
Takashi Iwai877211f2005-11-17 13:59:38 +01002101static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 unsigned int hwoff,
2103 unsigned long data, unsigned int off,
2104 snd_pcm_uframes_t frames)
2105{
Takashi Iwai877211f2005-11-17 13:59:38 +01002106 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 int err;
2108 void __user **bufs = (void __user **)data;
2109 int channels = runtime->channels;
2110 int c;
2111 if (substream->ops->copy) {
2112 for (c = 0; c < channels; ++c, ++bufs) {
2113 char __user *buf;
2114 if (*bufs == NULL)
2115 continue;
2116 buf = *bufs + samples_to_bytes(runtime, off);
2117 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2118 return err;
2119 }
2120 } else {
2121 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 for (c = 0; c < channels; ++c, ++bufs) {
2123 char *hwbuf;
2124 char __user *buf;
2125 if (*bufs == NULL)
2126 continue;
2127
2128 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2129 buf = *bufs + samples_to_bytes(runtime, off);
2130 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2131 return -EFAULT;
2132 }
2133 }
2134 return 0;
2135}
2136
Takashi Iwai877211f2005-11-17 13:59:38 +01002137snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 void __user **bufs,
2139 snd_pcm_uframes_t frames)
2140{
Takashi Iwai877211f2005-11-17 13:59:38 +01002141 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002143 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002145 err = pcm_sanity_check(substream);
2146 if (err < 0)
2147 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2150 return -EBADFD;
2151
Takashi Iwai0df63e42006-04-28 15:13:41 +02002152 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2154 return -EINVAL;
2155 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2156}
2157
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158EXPORT_SYMBOL(snd_pcm_lib_readv);