blob: c4840ff75d00a97ebbe12e3820ab43dd743a785e [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>
Paul Gortmakerd81a6d72011-09-22 09:34:58 -040026#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <sound/core.h>
28#include <sound/control.h>
Takashi Iwai2d3391e2012-07-27 18:27:00 +020029#include <sound/tlv.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <sound/info.h>
31#include <sound/pcm.h>
32#include <sound/pcm_params.h>
33#include <sound/timer.h>
34
35/*
36 * fill ring buffer with silence
37 * runtime->silence_start: starting pointer to silence area
38 * runtime->silence_filled: size filled with silence
39 * runtime->silence_threshold: threshold from application
40 * runtime->silence_size: maximal size from application
41 *
42 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
43 */
Takashi Iwai877211f2005-11-17 13:59:38 +010044void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
Takashi Iwai877211f2005-11-17 13:59:38 +010046 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 snd_pcm_uframes_t frames, ofs, transfer;
48
49 if (runtime->silence_size < runtime->boundary) {
50 snd_pcm_sframes_t noise_dist, n;
51 if (runtime->silence_start != runtime->control->appl_ptr) {
52 n = runtime->control->appl_ptr - runtime->silence_start;
53 if (n < 0)
54 n += runtime->boundary;
55 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
56 runtime->silence_filled -= n;
57 else
58 runtime->silence_filled = 0;
59 runtime->silence_start = runtime->control->appl_ptr;
60 }
Takashi Iwai235475c2005-12-07 15:28:07 +010061 if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
64 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
65 return;
66 frames = runtime->silence_threshold - noise_dist;
67 if (frames > runtime->silence_size)
68 frames = runtime->silence_size;
69 } else {
70 if (new_hw_ptr == ULONG_MAX) { /* initialization */
71 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
Jaroslav Kysela9e216e82010-07-19 16:37:39 +020072 if (avail > runtime->buffer_size)
73 avail = runtime->buffer_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 runtime->silence_filled = avail > 0 ? avail : 0;
75 runtime->silence_start = (runtime->status->hw_ptr +
76 runtime->silence_filled) %
77 runtime->boundary;
78 } else {
79 ofs = runtime->status->hw_ptr;
80 frames = new_hw_ptr - ofs;
81 if ((snd_pcm_sframes_t)frames < 0)
82 frames += runtime->boundary;
83 runtime->silence_filled -= frames;
84 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
85 runtime->silence_filled = 0;
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020086 runtime->silence_start = new_hw_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 } else {
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020088 runtime->silence_start = ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 }
91 frames = runtime->buffer_size - runtime->silence_filled;
92 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +020093 if (snd_BUG_ON(frames > runtime->buffer_size))
94 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (frames == 0)
96 return;
Clemens Ladisch9a826dd2006-10-23 16:26:57 +020097 ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 while (frames > 0) {
99 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
100 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
101 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
102 if (substream->ops->silence) {
103 int err;
104 err = substream->ops->silence(substream, -1, ofs, transfer);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200105 snd_BUG_ON(err < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 } else {
107 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
108 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
109 }
110 } else {
111 unsigned int c;
112 unsigned int channels = runtime->channels;
113 if (substream->ops->silence) {
114 for (c = 0; c < channels; ++c) {
115 int err;
116 err = substream->ops->silence(substream, c, ofs, transfer);
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200117 snd_BUG_ON(err < 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
119 } else {
120 size_t dma_csize = runtime->dma_bytes / channels;
121 for (c = 0; c < channels; ++c) {
122 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
123 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
124 }
125 }
126 }
127 runtime->silence_filled += transfer;
128 frames -= transfer;
129 ofs = 0;
130 }
131}
132
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200133#ifdef CONFIG_SND_DEBUG
134void snd_pcm_debug_name(struct snd_pcm_substream *substream,
Takashi Iwaic0070112009-06-08 15:58:48 +0200135 char *name, size_t len)
136{
137 snprintf(name, len, "pcmC%dD%d%c:%d",
138 substream->pcm->card->number,
139 substream->pcm->device,
140 substream->stream ? 'c' : 'p',
141 substream->number);
142}
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200143EXPORT_SYMBOL(snd_pcm_debug_name);
144#endif
Takashi Iwaic0070112009-06-08 15:58:48 +0200145
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100146#define XRUN_DEBUG_BASIC (1<<0)
147#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
148#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
149#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
150#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
151#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
152#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
153
154#ifdef CONFIG_SND_PCM_XRUN_DEBUG
155
156#define xrun_debug(substream, mask) \
157 ((substream)->pstr->xrun_debug & (mask))
Jarkko Nikula0f170142010-03-26 16:07:25 +0200158#else
159#define xrun_debug(substream, mask) 0
160#endif
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100161
162#define dump_stack_on_xrun(substream) do { \
163 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
164 dump_stack(); \
165 } while (0)
166
Takashi Iwai877211f2005-11-17 13:59:38 +0100167static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
Jaroslav Kysela13f040f2009-05-28 11:31:20 +0200169 struct snd_pcm_runtime *runtime = substream->runtime;
170
171 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
172 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
Jaroslav Kysela741b20c2009-12-17 17:34:39 +0100174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
Takashi Iwaic0070112009-06-08 15:58:48 +0200175 char name[16];
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200176 snd_pcm_debug_name(substream, name, sizeof(name));
Takashi Iwaic0070112009-06-08 15:58:48 +0200177 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100178 dump_stack_on_xrun(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
Jarkko Nikula0f170142010-03-26 16:07:25 +0200182#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100183#define hw_ptr_error(substream, fmt, args...) \
184 do { \
185 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100186 xrun_log_show(substream); \
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100187 if (printk_ratelimit()) { \
188 snd_printd("PCM: " fmt, ##args); \
189 } \
190 dump_stack_on_xrun(substream); \
191 } \
192 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100194#define XRUN_LOG_CNT 10
195
196struct hwptr_log_entry {
Ben Gardinerec08b142011-05-18 10:03:34 -0400197 unsigned int in_interrupt;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100198 unsigned long jiffies;
199 snd_pcm_uframes_t pos;
200 snd_pcm_uframes_t period_size;
201 snd_pcm_uframes_t buffer_size;
202 snd_pcm_uframes_t old_hw_ptr;
203 snd_pcm_uframes_t hw_ptr_base;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100204};
205
206struct snd_pcm_hwptr_log {
207 unsigned int idx;
208 unsigned int hit: 1;
209 struct hwptr_log_entry entries[XRUN_LOG_CNT];
210};
211
212static void xrun_log(struct snd_pcm_substream *substream,
Ben Gardinerec08b142011-05-18 10:03:34 -0400213 snd_pcm_uframes_t pos, int in_interrupt)
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100214{
215 struct snd_pcm_runtime *runtime = substream->runtime;
216 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
217 struct hwptr_log_entry *entry;
218
219 if (log == NULL) {
220 log = kzalloc(sizeof(*log), GFP_ATOMIC);
221 if (log == NULL)
222 return;
223 runtime->hwptr_log = log;
224 } else {
225 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
226 return;
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200227 }
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100228 entry = &log->entries[log->idx];
Ben Gardinerec08b142011-05-18 10:03:34 -0400229 entry->in_interrupt = in_interrupt;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100230 entry->jiffies = jiffies;
231 entry->pos = pos;
232 entry->period_size = runtime->period_size;
Joe Perchesc80c1d52010-11-14 19:05:02 -0800233 entry->buffer_size = runtime->buffer_size;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100234 entry->old_hw_ptr = runtime->status->hw_ptr;
235 entry->hw_ptr_base = runtime->hw_ptr_base;
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100236 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100239static void xrun_log_show(struct snd_pcm_substream *substream)
240{
241 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
242 struct hwptr_log_entry *entry;
243 char name[16];
244 unsigned int idx;
245 int cnt;
246
247 if (log == NULL)
248 return;
249 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
250 return;
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200251 snd_pcm_debug_name(substream, name, sizeof(name));
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100252 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
253 entry = &log->entries[idx];
254 if (entry->period_size == 0)
255 break;
Ben Gardinerec08b142011-05-18 10:03:34 -0400256 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100257 "hwptr=%ld/%ld\n",
Ben Gardinerec08b142011-05-18 10:03:34 -0400258 name, entry->in_interrupt ? "[Q] " : "",
259 entry->jiffies,
260 (unsigned long)entry->pos,
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100261 (unsigned long)entry->period_size,
262 (unsigned long)entry->buffer_size,
263 (unsigned long)entry->old_hw_ptr,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100264 (unsigned long)entry->hw_ptr_base);
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100265 idx++;
266 idx %= XRUN_LOG_CNT;
267 }
268 log->hit = 1;
269}
270
271#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
272
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100273#define hw_ptr_error(substream, fmt, args...) do { } while (0)
Ben Gardiner217658f2011-05-18 23:52:38 -0400274#define xrun_log(substream, pos, in_interrupt) do { } while (0)
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100275#define xrun_log_show(substream) do { } while (0)
276
277#endif
278
Jaroslav Kysela12509322010-01-07 15:36:31 +0100279int snd_pcm_update_state(struct snd_pcm_substream *substream,
280 struct snd_pcm_runtime *runtime)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
282 snd_pcm_uframes_t avail;
283
284 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
285 avail = snd_pcm_playback_avail(runtime);
286 else
287 avail = snd_pcm_capture_avail(runtime);
288 if (avail > runtime->avail_max)
289 runtime->avail_max = avail;
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200290 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
291 if (avail >= runtime->buffer_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 snd_pcm_drain_done(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200293 return -EPIPE;
294 }
295 } else {
296 if (avail >= runtime->stop_threshold) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 xrun(substream);
Takashi Iwai4cdc1152009-08-20 16:40:16 +0200298 return -EPIPE;
299 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
David Dillow5daeba32010-06-27 00:13:20 +0200301 if (runtime->twake) {
302 if (avail >= runtime->twake)
303 wake_up(&runtime->tsleep);
304 } else if (avail >= runtime->control->avail_min)
305 wake_up(&runtime->sleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return 0;
307}
308
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100309static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
310 unsigned int in_interrupt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Takashi Iwai877211f2005-11-17 13:59:38 +0100312 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 snd_pcm_uframes_t pos;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100314 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200315 snd_pcm_sframes_t hdelta, delta;
316 unsigned long jdelta;
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500317 unsigned long curr_jiffies;
318 struct timespec curr_tstamp;
Pierre-Louis Bossart4eeaaea2012-10-22 16:42:15 -0500319 struct timespec audio_tstamp;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500320 int crossed_boundary = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200322 old_hw_ptr = runtime->status->hw_ptr;
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500323
324 /*
325 * group pointer, time and jiffies reads to allow for more
326 * accurate correlations/corrections.
327 * The values are stored at the end of this routine after
328 * corrections for hw_ptr position
329 */
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100330 pos = substream->ops->pointer(substream);
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500331 curr_jiffies = jiffies;
Pierre-Louis Bossart4eeaaea2012-10-22 16:42:15 -0500332 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500333 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
334
Pierre-Louis Bossart4eeaaea2012-10-22 16:42:15 -0500335 if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
336 (substream->ops->wall_clock))
337 substream->ops->wall_clock(substream, &audio_tstamp);
338 }
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 if (pos == SNDRV_PCM_POS_XRUN) {
341 xrun(substream);
342 return -EPIPE;
343 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100344 if (pos >= runtime->buffer_size) {
345 if (printk_ratelimit()) {
346 char name[16];
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200347 snd_pcm_debug_name(substream, name, sizeof(name));
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100348 xrun_log_show(substream);
349 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
350 "buffer size = %ld, period size = %ld\n",
351 name, pos, runtime->buffer_size,
352 runtime->period_size);
353 }
354 pos = 0;
Takashi Iwaicedb8112009-07-23 11:04:13 +0200355 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100356 pos -= pos % runtime->min_align;
357 if (xrun_debug(substream, XRUN_DEBUG_LOG))
Ben Gardinerec08b142011-05-18 10:03:34 -0400358 xrun_log(substream, pos, in_interrupt);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100359 hw_base = runtime->hw_ptr_base;
360 new_hw_ptr = hw_base + pos;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100361 if (in_interrupt) {
362 /* we know that one period was processed */
363 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
Jaroslav Kyselae7636922010-01-26 17:08:24 +0100364 delta = runtime->hw_ptr_interrupt + runtime->period_size;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100365 if (delta > new_hw_ptr) {
Jaroslav Kyselabd76af02010-08-18 14:16:54 +0200366 /* check for double acknowledged interrupts */
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500367 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
Jaroslav Kyselabd76af02010-08-18 14:16:54 +0200368 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
369 hw_base += runtime->buffer_size;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500370 if (hw_base >= runtime->boundary) {
Jaroslav Kyselabd76af02010-08-18 14:16:54 +0200371 hw_base = 0;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500372 crossed_boundary++;
373 }
Jaroslav Kyselabd76af02010-08-18 14:16:54 +0200374 new_hw_ptr = hw_base + pos;
375 goto __delta;
376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100379 /* new_hw_ptr might be lower than old_hw_ptr in case when */
380 /* pointer crosses the end of the ring buffer */
381 if (new_hw_ptr < old_hw_ptr) {
382 hw_base += runtime->buffer_size;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500383 if (hw_base >= runtime->boundary) {
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100384 hw_base = 0;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500385 crossed_boundary++;
386 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100387 new_hw_ptr = hw_base + pos;
388 }
389 __delta:
Clemens Ladischb406e612010-05-25 09:01:46 +0200390 delta = new_hw_ptr - old_hw_ptr;
391 if (delta < 0)
392 delta += runtime->boundary;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100393 if (xrun_debug(substream, in_interrupt ?
394 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
395 char name[16];
Eliot Blennerhassettacb03d42011-07-23 12:36:25 +1200396 snd_pcm_debug_name(substream, name, sizeof(name));
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100397 snd_printd("%s_update: %s: pos=%u/%u/%u, "
398 "hwptr=%ld/%ld/%ld/%ld\n",
399 in_interrupt ? "period" : "hwptr",
400 name,
401 (unsigned int)pos,
402 (unsigned int)runtime->period_size,
403 (unsigned int)runtime->buffer_size,
404 (unsigned long)delta,
405 (unsigned long)old_hw_ptr,
406 (unsigned long)new_hw_ptr,
407 (unsigned long)runtime->hw_ptr_base);
408 }
Clemens Ladischab69a492010-11-15 10:46:23 +0100409
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100410 if (runtime->no_period_wakeup) {
Kelly Anderson12ff4142011-04-01 11:58:25 +0200411 snd_pcm_sframes_t xrun_threshold;
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100412 /*
413 * Without regular period interrupts, we have to check
414 * the elapsed time to detect xruns.
415 */
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500416 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
Clemens Ladisch47228e42010-11-18 09:53:07 +0100417 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
418 goto no_delta_check;
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100419 hdelta = jdelta - delta * HZ / runtime->rate;
Kelly Anderson12ff4142011-04-01 11:58:25 +0200420 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
421 while (hdelta > xrun_threshold) {
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100422 delta += runtime->buffer_size;
423 hw_base += runtime->buffer_size;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500424 if (hw_base >= runtime->boundary) {
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100425 hw_base = 0;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500426 crossed_boundary++;
427 }
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100428 new_hw_ptr = hw_base + pos;
429 hdelta -= runtime->hw_ptr_buffer_jiffies;
430 }
Clemens Ladischab69a492010-11-15 10:46:23 +0100431 goto no_delta_check;
Clemens Ladisch59ff8782010-11-18 09:43:52 +0100432 }
Clemens Ladischab69a492010-11-15 10:46:23 +0100433
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100434 /* something must be really wrong */
Jaroslav Kysela7b3a1772010-01-08 08:43:01 +0100435 if (delta >= runtime->buffer_size + runtime->period_size) {
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100436 hw_ptr_error(substream,
437 "Unexpected hw_pointer value %s"
438 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
439 "old_hw_ptr=%ld)\n",
440 in_interrupt ? "[Q] " : "[P]",
441 substream->stream, (long)pos,
442 (long)new_hw_ptr, (long)old_hw_ptr);
443 return 0;
444 }
Takashi Iwaic87d9732009-05-27 10:53:33 +0200445
446 /* Do jiffies check only in xrun_debug mode */
Jaroslav Kysela741b20c2009-12-17 17:34:39 +0100447 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
Takashi Iwaic87d9732009-05-27 10:53:33 +0200448 goto no_jiffies_check;
449
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200450 /* Skip the jiffies check for hardwares with BATCH flag.
451 * Such hardware usually just increases the position at each IRQ,
452 * thus it can't give any strange position.
453 */
454 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
455 goto no_jiffies_check;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100456 hdelta = delta;
Jaroslav Kyselaa4444da2009-05-28 12:31:56 +0200457 if (hdelta < runtime->delay)
458 goto no_jiffies_check;
459 hdelta -= runtime->delay;
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500460 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200461 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
462 delta = jdelta /
463 (((runtime->period_size * HZ) / runtime->rate)
464 + HZ/100);
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100465 /* move new_hw_ptr according jiffies not pos variable */
466 new_hw_ptr = old_hw_ptr;
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100467 hw_base = delta;
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100468 /* use loop to avoid checks for delta overflows */
469 /* the delta value is small or zero in most cases */
470 while (delta > 0) {
471 new_hw_ptr += runtime->period_size;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500472 if (new_hw_ptr >= runtime->boundary) {
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100473 new_hw_ptr -= runtime->boundary;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500474 crossed_boundary--;
475 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100476 delta--;
477 }
478 /* align hw_base to buffer_size */
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200479 hw_ptr_error(substream,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100480 "hw_ptr skipping! %s"
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200481 "(pos=%ld, delta=%ld, period=%ld, "
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100482 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
483 in_interrupt ? "[Q] " : "",
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200484 (long)pos, (long)hdelta,
485 (long)runtime->period_size, jdelta,
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100486 ((hdelta * HZ) / runtime->rate), hw_base,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100487 (unsigned long)old_hw_ptr,
488 (unsigned long)new_hw_ptr);
Jaroslav Kyselaed69c6a2010-01-13 08:12:31 +0100489 /* reset values to proper state */
490 delta = 0;
491 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200492 }
Takashi Iwai3e5b5012009-04-28 12:07:08 +0200493 no_jiffies_check:
Jaroslav Kyselabbf6ad12009-04-10 12:28:58 +0200494 if (delta > runtime->period_size + runtime->period_size / 2) {
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100495 hw_ptr_error(substream,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100496 "Lost interrupts? %s"
497 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
498 "old_hw_ptr=%ld)\n",
499 in_interrupt ? "[Q] " : "",
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100500 substream->stream, (long)delta,
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100501 (long)new_hw_ptr,
502 (long)old_hw_ptr);
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100503 }
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100504
Clemens Ladischab69a492010-11-15 10:46:23 +0100505 no_delta_check:
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100506 if (runtime->status->hw_ptr == new_hw_ptr)
507 return 0;
Takashi Iwaiab1863f2009-06-07 12:09:17 +0200508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
510 runtime->silence_size > 0)
511 snd_pcm_playback_silence(substream, new_hw_ptr);
512
Jaroslav Kyselae7636922010-01-26 17:08:24 +0100513 if (in_interrupt) {
Clemens Ladischead40462010-05-21 09:15:59 +0200514 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
515 if (delta < 0)
516 delta += runtime->boundary;
517 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
518 runtime->hw_ptr_interrupt += delta;
519 if (runtime->hw_ptr_interrupt >= runtime->boundary)
520 runtime->hw_ptr_interrupt -= runtime->boundary;
Jaroslav Kyselae7636922010-01-26 17:08:24 +0100521 }
Takashi Iwaied3da3d2009-03-03 17:00:15 +0100522 runtime->hw_ptr_base = hw_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 runtime->status->hw_ptr = new_hw_ptr;
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500524 runtime->hw_ptr_jiffies = curr_jiffies;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -0500525 if (crossed_boundary) {
526 snd_BUG_ON(crossed_boundary != 1);
527 runtime->hw_ptr_wrap += runtime->boundary;
528 }
Pierre-Louis Bossart4eeaaea2012-10-22 16:42:15 -0500529 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
Pierre-Louis Bossart3509a032012-05-22 14:54:02 -0500530 runtime->status->tstamp = curr_tstamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Pierre-Louis Bossart4eeaaea2012-10-22 16:42:15 -0500532 if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
533 /*
534 * no wall clock available, provide audio timestamp
535 * derived from pointer position+delay
536 */
537 u64 audio_frames, audio_nsecs;
538
539 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
540 audio_frames = runtime->hw_ptr_wrap
541 + runtime->status->hw_ptr
542 - runtime->delay;
543 else
544 audio_frames = runtime->hw_ptr_wrap
545 + runtime->status->hw_ptr
546 + runtime->delay;
547 audio_nsecs = div_u64(audio_frames * 1000000000LL,
548 runtime->rate);
549 audio_tstamp = ns_to_timespec(audio_nsecs);
550 }
551 runtime->status->audio_tstamp = audio_tstamp;
552 }
553
Jaroslav Kysela12509322010-01-07 15:36:31 +0100554 return snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
557/* CAUTION: call it with irq disabled */
Takashi Iwai877211f2005-11-17 13:59:38 +0100558int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
Jaroslav Kyselaf2404062010-01-05 17:19:34 +0100560 return snd_pcm_update_hw_ptr0(substream, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561}
562
563/**
564 * snd_pcm_set_ops - set the PCM operators
565 * @pcm: the pcm instance
566 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
567 * @ops: the operator table
568 *
569 * Sets the given PCM operators to the pcm instance.
570 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100571void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Takashi Iwai877211f2005-11-17 13:59:38 +0100573 struct snd_pcm_str *stream = &pcm->streams[direction];
574 struct snd_pcm_substream *substream;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 for (substream = stream->substream; substream != NULL; substream = substream->next)
577 substream->ops = ops;
578}
579
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200580EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582/**
583 * snd_pcm_sync - set the PCM sync id
584 * @substream: the pcm substream
585 *
586 * Sets the PCM sync identifier for the card.
587 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100588void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Takashi Iwai877211f2005-11-17 13:59:38 +0100590 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 runtime->sync.id32[0] = substream->pcm->card->number;
593 runtime->sync.id32[1] = -1;
594 runtime->sync.id32[2] = -1;
595 runtime->sync.id32[3] = -1;
596}
597
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200598EXPORT_SYMBOL(snd_pcm_set_sync);
599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600/*
601 * Standard ioctl routine
602 */
603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604static inline unsigned int div32(unsigned int a, unsigned int b,
605 unsigned int *r)
606{
607 if (b == 0) {
608 *r = 0;
609 return UINT_MAX;
610 }
611 *r = a % b;
612 return a / b;
613}
614
615static inline unsigned int div_down(unsigned int a, unsigned int b)
616{
617 if (b == 0)
618 return UINT_MAX;
619 return a / b;
620}
621
622static inline unsigned int div_up(unsigned int a, unsigned int b)
623{
624 unsigned int r;
625 unsigned int q;
626 if (b == 0)
627 return UINT_MAX;
628 q = div32(a, b, &r);
629 if (r)
630 ++q;
631 return q;
632}
633
634static inline unsigned int mul(unsigned int a, unsigned int b)
635{
636 if (a == 0)
637 return 0;
638 if (div_down(UINT_MAX, a) < b)
639 return UINT_MAX;
640 return a * b;
641}
642
643static inline unsigned int muldiv32(unsigned int a, unsigned int b,
644 unsigned int c, unsigned int *r)
645{
646 u_int64_t n = (u_int64_t) a * b;
647 if (c == 0) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200648 snd_BUG_ON(!n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 *r = 0;
650 return UINT_MAX;
651 }
Takashi Iwai3f7440a2009-06-05 17:40:04 +0200652 n = div_u64_rem(n, c, r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 if (n >= UINT_MAX) {
654 *r = 0;
655 return UINT_MAX;
656 }
657 return n;
658}
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660/**
661 * snd_interval_refine - refine the interval value of configurator
662 * @i: the interval value to refine
663 * @v: the interval value to refer to
664 *
665 * Refines the interval value with the reference value.
666 * The interval is changed to the range satisfying both intervals.
667 * The interval status (min, max, integer, etc.) are evaluated.
668 *
669 * Returns non-zero if the value is changed, zero if not changed.
670 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100671int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
673 int changed = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200674 if (snd_BUG_ON(snd_interval_empty(i)))
675 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 if (i->min < v->min) {
677 i->min = v->min;
678 i->openmin = v->openmin;
679 changed = 1;
680 } else if (i->min == v->min && !i->openmin && v->openmin) {
681 i->openmin = 1;
682 changed = 1;
683 }
684 if (i->max > v->max) {
685 i->max = v->max;
686 i->openmax = v->openmax;
687 changed = 1;
688 } else if (i->max == v->max && !i->openmax && v->openmax) {
689 i->openmax = 1;
690 changed = 1;
691 }
692 if (!i->integer && v->integer) {
693 i->integer = 1;
694 changed = 1;
695 }
696 if (i->integer) {
697 if (i->openmin) {
698 i->min++;
699 i->openmin = 0;
700 }
701 if (i->openmax) {
702 i->max--;
703 i->openmax = 0;
704 }
705 } else if (!i->openmin && !i->openmax && i->min == i->max)
706 i->integer = 1;
707 if (snd_interval_checkempty(i)) {
708 snd_interval_none(i);
709 return -EINVAL;
710 }
711 return changed;
712}
713
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200714EXPORT_SYMBOL(snd_interval_refine);
715
Takashi Iwai877211f2005-11-17 13:59:38 +0100716static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200718 if (snd_BUG_ON(snd_interval_empty(i)))
719 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (snd_interval_single(i))
721 return 0;
722 i->max = i->min;
723 i->openmax = i->openmin;
724 if (i->openmax)
725 i->max++;
726 return 1;
727}
728
Takashi Iwai877211f2005-11-17 13:59:38 +0100729static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200731 if (snd_BUG_ON(snd_interval_empty(i)))
732 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 if (snd_interval_single(i))
734 return 0;
735 i->min = i->max;
736 i->openmin = i->openmax;
737 if (i->openmin)
738 i->min--;
739 return 1;
740}
741
Takashi Iwai877211f2005-11-17 13:59:38 +0100742void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
744 if (a->empty || b->empty) {
745 snd_interval_none(c);
746 return;
747 }
748 c->empty = 0;
749 c->min = mul(a->min, b->min);
750 c->openmin = (a->openmin || b->openmin);
751 c->max = mul(a->max, b->max);
752 c->openmax = (a->openmax || b->openmax);
753 c->integer = (a->integer && b->integer);
754}
755
756/**
757 * snd_interval_div - refine the interval value with division
Takashi Iwaidf8db932005-09-07 13:38:19 +0200758 * @a: dividend
759 * @b: divisor
760 * @c: quotient
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 *
762 * c = a / b
763 *
764 * Returns non-zero if the value is changed, zero if not changed.
765 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100766void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
768 unsigned int r;
769 if (a->empty || b->empty) {
770 snd_interval_none(c);
771 return;
772 }
773 c->empty = 0;
774 c->min = div32(a->min, b->max, &r);
775 c->openmin = (r || a->openmin || b->openmax);
776 if (b->min > 0) {
777 c->max = div32(a->max, b->min, &r);
778 if (r) {
779 c->max++;
780 c->openmax = 1;
781 } else
782 c->openmax = (a->openmax || b->openmin);
783 } else {
784 c->max = UINT_MAX;
785 c->openmax = 0;
786 }
787 c->integer = 0;
788}
789
790/**
791 * snd_interval_muldivk - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200792 * @a: dividend 1
793 * @b: dividend 2
794 * @k: divisor (as integer)
795 * @c: result
796 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 * c = a * b / k
798 *
799 * Returns non-zero if the value is changed, zero if not changed.
800 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100801void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
802 unsigned int k, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
804 unsigned int r;
805 if (a->empty || b->empty) {
806 snd_interval_none(c);
807 return;
808 }
809 c->empty = 0;
810 c->min = muldiv32(a->min, b->min, k, &r);
811 c->openmin = (r || a->openmin || b->openmin);
812 c->max = muldiv32(a->max, b->max, k, &r);
813 if (r) {
814 c->max++;
815 c->openmax = 1;
816 } else
817 c->openmax = (a->openmax || b->openmax);
818 c->integer = 0;
819}
820
821/**
822 * snd_interval_mulkdiv - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200823 * @a: dividend 1
824 * @k: dividend 2 (as integer)
825 * @b: divisor
826 * @c: result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 *
828 * c = a * k / b
829 *
830 * Returns non-zero if the value is changed, zero if not changed.
831 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100832void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
833 const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834{
835 unsigned int r;
836 if (a->empty || b->empty) {
837 snd_interval_none(c);
838 return;
839 }
840 c->empty = 0;
841 c->min = muldiv32(a->min, k, b->max, &r);
842 c->openmin = (r || a->openmin || b->openmax);
843 if (b->min > 0) {
844 c->max = muldiv32(a->max, k, b->min, &r);
845 if (r) {
846 c->max++;
847 c->openmax = 1;
848 } else
849 c->openmax = (a->openmax || b->openmin);
850 } else {
851 c->max = UINT_MAX;
852 c->openmax = 0;
853 }
854 c->integer = 0;
855}
856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857/* ---- */
858
859
860/**
861 * snd_interval_ratnum - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200862 * @i: interval to refine
863 * @rats_count: number of ratnum_t
864 * @rats: ratnum_t array
865 * @nump: pointer to store the resultant numerator
866 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 *
868 * Returns non-zero if the value is changed, zero if not changed.
869 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100870int snd_interval_ratnum(struct snd_interval *i,
871 unsigned int rats_count, struct snd_ratnum *rats,
872 unsigned int *nump, unsigned int *denp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873{
Krzysztof Helt8374e242009-12-21 17:07:08 +0100874 unsigned int best_num, best_den;
875 int best_diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100877 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 int err;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100879 unsigned int result_num, result_den;
880 int result_diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 best_num = best_den = best_diff = 0;
883 for (k = 0; k < rats_count; ++k) {
884 unsigned int num = rats[k].num;
885 unsigned int den;
886 unsigned int q = i->min;
887 int diff;
888 if (q == 0)
889 q = 1;
Krzysztof Helt40962d72009-12-19 18:31:04 +0100890 den = div_up(num, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (den < rats[k].den_min)
892 continue;
893 if (den > rats[k].den_max)
894 den = rats[k].den_max;
895 else {
896 unsigned int r;
897 r = (den - rats[k].den_min) % rats[k].den_step;
898 if (r != 0)
899 den -= r;
900 }
901 diff = num - q * den;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100902 if (diff < 0)
903 diff = -diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if (best_num == 0 ||
905 diff * best_den < best_diff * den) {
906 best_diff = diff;
907 best_den = den;
908 best_num = num;
909 }
910 }
911 if (best_den == 0) {
912 i->empty = 1;
913 return -EINVAL;
914 }
915 t.min = div_down(best_num, best_den);
916 t.openmin = !!(best_num % best_den);
917
Krzysztof Helt8374e242009-12-21 17:07:08 +0100918 result_num = best_num;
919 result_diff = best_diff;
920 result_den = best_den;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 best_num = best_den = best_diff = 0;
922 for (k = 0; k < rats_count; ++k) {
923 unsigned int num = rats[k].num;
924 unsigned int den;
925 unsigned int q = i->max;
926 int diff;
927 if (q == 0) {
928 i->empty = 1;
929 return -EINVAL;
930 }
Krzysztof Helt40962d72009-12-19 18:31:04 +0100931 den = div_down(num, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 if (den > rats[k].den_max)
933 continue;
934 if (den < rats[k].den_min)
935 den = rats[k].den_min;
936 else {
937 unsigned int r;
938 r = (den - rats[k].den_min) % rats[k].den_step;
939 if (r != 0)
940 den += rats[k].den_step - r;
941 }
942 diff = q * den - num;
Krzysztof Helt8374e242009-12-21 17:07:08 +0100943 if (diff < 0)
944 diff = -diff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 if (best_num == 0 ||
946 diff * best_den < best_diff * den) {
947 best_diff = diff;
948 best_den = den;
949 best_num = num;
950 }
951 }
952 if (best_den == 0) {
953 i->empty = 1;
954 return -EINVAL;
955 }
956 t.max = div_up(best_num, best_den);
957 t.openmax = !!(best_num % best_den);
958 t.integer = 0;
959 err = snd_interval_refine(i, &t);
960 if (err < 0)
961 return err;
962
963 if (snd_interval_single(i)) {
Krzysztof Helt8374e242009-12-21 17:07:08 +0100964 if (best_diff * result_den < result_diff * best_den) {
965 result_num = best_num;
966 result_den = best_den;
967 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 if (nump)
Krzysztof Helt8374e242009-12-21 17:07:08 +0100969 *nump = result_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 if (denp)
Krzysztof Helt8374e242009-12-21 17:07:08 +0100971 *denp = result_den;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 }
973 return err;
974}
975
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200976EXPORT_SYMBOL(snd_interval_ratnum);
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978/**
979 * snd_interval_ratden - refine the interval value
Takashi Iwaidf8db932005-09-07 13:38:19 +0200980 * @i: interval to refine
Takashi Iwai877211f2005-11-17 13:59:38 +0100981 * @rats_count: number of struct ratden
982 * @rats: struct ratden array
Takashi Iwaidf8db932005-09-07 13:38:19 +0200983 * @nump: pointer to store the resultant numerator
984 * @denp: pointer to store the resultant denominator
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 *
986 * Returns non-zero if the value is changed, zero if not changed.
987 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100988static int snd_interval_ratden(struct snd_interval *i,
989 unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 unsigned int *nump, unsigned int *denp)
991{
992 unsigned int best_num, best_diff, best_den;
993 unsigned int k;
Takashi Iwai877211f2005-11-17 13:59:38 +0100994 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 int err;
996
997 best_num = best_den = best_diff = 0;
998 for (k = 0; k < rats_count; ++k) {
999 unsigned int num;
1000 unsigned int den = rats[k].den;
1001 unsigned int q = i->min;
1002 int diff;
1003 num = mul(q, den);
1004 if (num > rats[k].num_max)
1005 continue;
1006 if (num < rats[k].num_min)
1007 num = rats[k].num_max;
1008 else {
1009 unsigned int r;
1010 r = (num - rats[k].num_min) % rats[k].num_step;
1011 if (r != 0)
1012 num += rats[k].num_step - r;
1013 }
1014 diff = num - q * den;
1015 if (best_num == 0 ||
1016 diff * best_den < best_diff * den) {
1017 best_diff = diff;
1018 best_den = den;
1019 best_num = num;
1020 }
1021 }
1022 if (best_den == 0) {
1023 i->empty = 1;
1024 return -EINVAL;
1025 }
1026 t.min = div_down(best_num, best_den);
1027 t.openmin = !!(best_num % best_den);
1028
1029 best_num = best_den = best_diff = 0;
1030 for (k = 0; k < rats_count; ++k) {
1031 unsigned int num;
1032 unsigned int den = rats[k].den;
1033 unsigned int q = i->max;
1034 int diff;
1035 num = mul(q, den);
1036 if (num < rats[k].num_min)
1037 continue;
1038 if (num > rats[k].num_max)
1039 num = rats[k].num_max;
1040 else {
1041 unsigned int r;
1042 r = (num - rats[k].num_min) % rats[k].num_step;
1043 if (r != 0)
1044 num -= r;
1045 }
1046 diff = q * den - num;
1047 if (best_num == 0 ||
1048 diff * best_den < best_diff * den) {
1049 best_diff = diff;
1050 best_den = den;
1051 best_num = num;
1052 }
1053 }
1054 if (best_den == 0) {
1055 i->empty = 1;
1056 return -EINVAL;
1057 }
1058 t.max = div_up(best_num, best_den);
1059 t.openmax = !!(best_num % best_den);
1060 t.integer = 0;
1061 err = snd_interval_refine(i, &t);
1062 if (err < 0)
1063 return err;
1064
1065 if (snd_interval_single(i)) {
1066 if (nump)
1067 *nump = best_num;
1068 if (denp)
1069 *denp = best_den;
1070 }
1071 return err;
1072}
1073
1074/**
1075 * snd_interval_list - refine the interval value from the list
1076 * @i: the interval value to refine
1077 * @count: the number of elements in the list
1078 * @list: the value list
1079 * @mask: the bit-mask to evaluate
1080 *
1081 * Refines the interval value from the list.
1082 * When mask is non-zero, only the elements corresponding to bit 1 are
1083 * evaluated.
1084 *
1085 * Returns non-zero if the value is changed, zero if not changed.
1086 */
Mark Brown4af87a92012-03-14 19:48:43 +00001087int snd_interval_list(struct snd_interval *i, unsigned int count,
1088 const unsigned int *list, unsigned int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089{
1090 unsigned int k;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001091 struct snd_interval list_range;
Takashi Iwai0981a262007-02-01 14:53:49 +01001092
1093 if (!count) {
1094 i->empty = 1;
1095 return -EINVAL;
1096 }
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001097 snd_interval_any(&list_range);
1098 list_range.min = UINT_MAX;
1099 list_range.max = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 for (k = 0; k < count; k++) {
1101 if (mask && !(mask & (1 << k)))
1102 continue;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001103 if (!snd_interval_test(i, list[k]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 continue;
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001105 list_range.min = min(list_range.min, list[k]);
1106 list_range.max = max(list_range.max, list[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 }
Clemens Ladischb1ddaf62009-08-25 08:15:41 +02001108 return snd_interval_refine(i, &list_range);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109}
1110
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001111EXPORT_SYMBOL(snd_interval_list);
1112
Takashi Iwai877211f2005-11-17 13:59:38 +01001113static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
1115 unsigned int n;
1116 int changed = 0;
1117 n = (i->min - min) % step;
1118 if (n != 0 || i->openmin) {
1119 i->min += step - n;
1120 changed = 1;
1121 }
1122 n = (i->max - min) % step;
1123 if (n != 0 || i->openmax) {
1124 i->max -= n;
1125 changed = 1;
1126 }
1127 if (snd_interval_checkempty(i)) {
1128 i->empty = 1;
1129 return -EINVAL;
1130 }
1131 return changed;
1132}
1133
1134/* Info constraints helpers */
1135
1136/**
1137 * snd_pcm_hw_rule_add - add the hw-constraint rule
1138 * @runtime: the pcm runtime instance
1139 * @cond: condition bits
1140 * @var: the variable to evaluate
1141 * @func: the evaluation function
1142 * @private: the private data pointer passed to function
1143 * @dep: the dependent variables
1144 *
1145 * Returns zero if successful, or a negative error code on failure.
1146 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001147int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 int var,
1149 snd_pcm_hw_rule_func_t func, void *private,
1150 int dep, ...)
1151{
Takashi Iwai877211f2005-11-17 13:59:38 +01001152 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1153 struct snd_pcm_hw_rule *c;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 unsigned int k;
1155 va_list args;
1156 va_start(args, dep);
1157 if (constrs->rules_num >= constrs->rules_all) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001158 struct snd_pcm_hw_rule *new;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 unsigned int new_rules = constrs->rules_all + 16;
1160 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
Jesper Juhl87a1c8a2010-12-21 00:03:17 +01001161 if (!new) {
1162 va_end(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 return -ENOMEM;
Jesper Juhl87a1c8a2010-12-21 00:03:17 +01001164 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 if (constrs->rules) {
1166 memcpy(new, constrs->rules,
1167 constrs->rules_num * sizeof(*c));
1168 kfree(constrs->rules);
1169 }
1170 constrs->rules = new;
1171 constrs->rules_all = new_rules;
1172 }
1173 c = &constrs->rules[constrs->rules_num];
1174 c->cond = cond;
1175 c->func = func;
1176 c->var = var;
1177 c->private = private;
1178 k = 0;
1179 while (1) {
Jesper Juhl87a1c8a2010-12-21 00:03:17 +01001180 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1181 va_end(args);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001182 return -EINVAL;
Jesper Juhl87a1c8a2010-12-21 00:03:17 +01001183 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 c->deps[k++] = dep;
1185 if (dep < 0)
1186 break;
1187 dep = va_arg(args, int);
1188 }
1189 constrs->rules_num++;
1190 va_end(args);
1191 return 0;
Jesper Juhl87a1c8a2010-12-21 00:03:17 +01001192}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001194EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1195
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001197 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001198 * @runtime: PCM runtime instance
1199 * @var: hw_params variable to apply the mask
1200 * @mask: the bitmap mask
1201 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001202 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001204int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 u_int32_t mask)
1206{
Takashi Iwai877211f2005-11-17 13:59:38 +01001207 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1208 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 *maskp->bits &= mask;
1210 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1211 if (*maskp->bits == 0)
1212 return -EINVAL;
1213 return 0;
1214}
1215
1216/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001217 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
Takashi Iwaidf8db932005-09-07 13:38:19 +02001218 * @runtime: PCM runtime instance
1219 * @var: hw_params variable to apply the mask
1220 * @mask: the 64bit bitmap mask
1221 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001222 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001224int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 u_int64_t mask)
1226{
Takashi Iwai877211f2005-11-17 13:59:38 +01001227 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1228 struct snd_mask *maskp = constrs_mask(constrs, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 maskp->bits[0] &= (u_int32_t)mask;
1230 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1231 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1232 if (! maskp->bits[0] && ! maskp->bits[1])
1233 return -EINVAL;
1234 return 0;
1235}
1236
1237/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001238 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001239 * @runtime: PCM runtime instance
1240 * @var: hw_params variable to apply the integer constraint
1241 *
1242 * Apply the constraint of integer to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001244int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245{
Takashi Iwai877211f2005-11-17 13:59:38 +01001246 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 return snd_interval_setinteger(constrs_interval(constrs, var));
1248}
1249
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001250EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1251
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001253 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
Takashi Iwaidf8db932005-09-07 13:38:19 +02001254 * @runtime: PCM runtime instance
1255 * @var: hw_params variable to apply the range
1256 * @min: the minimal value
1257 * @max: the maximal value
1258 *
1259 * Apply the min/max range constraint to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001261int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 unsigned int min, unsigned int max)
1263{
Takashi Iwai877211f2005-11-17 13:59:38 +01001264 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1265 struct snd_interval t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 t.min = min;
1267 t.max = max;
1268 t.openmin = t.openmax = 0;
1269 t.integer = 0;
1270 return snd_interval_refine(constrs_interval(constrs, var), &t);
1271}
1272
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001273EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1274
Takashi Iwai877211f2005-11-17 13:59:38 +01001275static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1276 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277{
Takashi Iwai877211f2005-11-17 13:59:38 +01001278 struct snd_pcm_hw_constraint_list *list = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1280}
1281
1282
1283/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001284 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001285 * @runtime: PCM runtime instance
1286 * @cond: condition bits
1287 * @var: hw_params variable to apply the list constraint
1288 * @l: list
1289 *
1290 * Apply the list of constraints to an interval parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001292int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 unsigned int cond,
1294 snd_pcm_hw_param_t var,
Mark Brown14641892012-07-05 12:15:01 +01001295 const struct snd_pcm_hw_constraint_list *l)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
1297 return snd_pcm_hw_rule_add(runtime, cond, var,
Mark Brown14641892012-07-05 12:15:01 +01001298 snd_pcm_hw_rule_list, (void *)l,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 var, -1);
1300}
1301
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001302EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1303
Takashi Iwai877211f2005-11-17 13:59:38 +01001304static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1305 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
Takashi Iwai877211f2005-11-17 13:59:38 +01001307 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 unsigned int num = 0, den = 0;
1309 int err;
1310 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1311 r->nrats, r->rats, &num, &den);
1312 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1313 params->rate_num = num;
1314 params->rate_den = den;
1315 }
1316 return err;
1317}
1318
1319/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001320 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @var: hw_params variable to apply the ratnums constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001324 * @r: struct snd_ratnums constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001326int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 unsigned int cond,
1328 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001329 struct snd_pcm_hw_constraint_ratnums *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330{
1331 return snd_pcm_hw_rule_add(runtime, cond, var,
1332 snd_pcm_hw_rule_ratnums, r,
1333 var, -1);
1334}
1335
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001336EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1337
Takashi Iwai877211f2005-11-17 13:59:38 +01001338static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1339 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340{
Takashi Iwai877211f2005-11-17 13:59:38 +01001341 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 unsigned int num = 0, den = 0;
1343 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1344 r->nrats, r->rats, &num, &den);
1345 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1346 params->rate_num = num;
1347 params->rate_den = den;
1348 }
1349 return err;
1350}
1351
1352/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001353 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
Takashi Iwaidf8db932005-09-07 13:38:19 +02001354 * @runtime: PCM runtime instance
1355 * @cond: condition bits
1356 * @var: hw_params variable to apply the ratdens constraint
Takashi Iwai877211f2005-11-17 13:59:38 +01001357 * @r: struct snd_ratdens constriants
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001359int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 unsigned int cond,
1361 snd_pcm_hw_param_t var,
Takashi Iwai877211f2005-11-17 13:59:38 +01001362 struct snd_pcm_hw_constraint_ratdens *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363{
1364 return snd_pcm_hw_rule_add(runtime, cond, var,
1365 snd_pcm_hw_rule_ratdens, r,
1366 var, -1);
1367}
1368
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001369EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1370
Takashi Iwai877211f2005-11-17 13:59:38 +01001371static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1372 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373{
1374 unsigned int l = (unsigned long) rule->private;
1375 int width = l & 0xffff;
1376 unsigned int msbits = l >> 16;
Takashi Iwai877211f2005-11-17 13:59:38 +01001377 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 if (snd_interval_single(i) && snd_interval_value(i) == width)
1379 params->msbits = msbits;
1380 return 0;
1381}
1382
1383/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001384 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001385 * @runtime: PCM runtime instance
1386 * @cond: condition bits
1387 * @width: sample bits width
1388 * @msbits: msbits width
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001390int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 unsigned int cond,
1392 unsigned int width,
1393 unsigned int msbits)
1394{
1395 unsigned long l = (msbits << 16) | width;
1396 return snd_pcm_hw_rule_add(runtime, cond, -1,
1397 snd_pcm_hw_rule_msbits,
1398 (void*) l,
1399 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1400}
1401
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001402EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1403
Takashi Iwai877211f2005-11-17 13:59:38 +01001404static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1405 struct snd_pcm_hw_rule *rule)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
1407 unsigned long step = (unsigned long) rule->private;
1408 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1409}
1410
1411/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001412 * snd_pcm_hw_constraint_step - add a hw constraint step rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001413 * @runtime: PCM runtime instance
1414 * @cond: condition bits
1415 * @var: hw_params variable to apply the step constraint
1416 * @step: step size
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001418int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 unsigned int cond,
1420 snd_pcm_hw_param_t var,
1421 unsigned long step)
1422{
1423 return snd_pcm_hw_rule_add(runtime, cond, var,
1424 snd_pcm_hw_rule_step, (void *) step,
1425 var, -1);
1426}
1427
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001428EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1429
Takashi Iwai877211f2005-11-17 13:59:38 +01001430static 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 -07001431{
Marcin Åšlusarz67c39312007-12-14 12:53:21 +01001432 static unsigned int pow2_sizes[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1434 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1435 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1436 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1437 };
1438 return snd_interval_list(hw_param_interval(params, rule->var),
1439 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1440}
1441
1442/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001443 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
Takashi Iwaidf8db932005-09-07 13:38:19 +02001444 * @runtime: PCM runtime instance
1445 * @cond: condition bits
1446 * @var: hw_params variable to apply the power-of-2 constraint
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001448int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 unsigned int cond,
1450 snd_pcm_hw_param_t var)
1451{
1452 return snd_pcm_hw_rule_add(runtime, cond, var,
1453 snd_pcm_hw_rule_pow2, NULL,
1454 var, -1);
1455}
1456
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001457EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1458
Clemens Ladischd5b702a2011-09-16 23:03:02 +02001459static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1460 struct snd_pcm_hw_rule *rule)
1461{
1462 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1463 struct snd_interval *rate;
1464
1465 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1466 return snd_interval_list(rate, 1, &base_rate, 0);
1467}
1468
1469/**
1470 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1471 * @runtime: PCM runtime instance
1472 * @base_rate: the rate at which the hardware does not resample
1473 */
1474int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1475 unsigned int base_rate)
1476{
1477 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1478 SNDRV_PCM_HW_PARAM_RATE,
1479 snd_pcm_hw_rule_noresample_func,
1480 (void *)(uintptr_t)base_rate,
1481 SNDRV_PCM_HW_PARAM_RATE, -1);
1482}
1483EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1484
Takashi Iwai877211f2005-11-17 13:59:38 +01001485static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001486 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 if (hw_is_mask(var)) {
1489 snd_mask_any(hw_param_mask(params, var));
1490 params->cmask |= 1 << var;
1491 params->rmask |= 1 << var;
1492 return;
1493 }
1494 if (hw_is_interval(var)) {
1495 snd_interval_any(hw_param_interval(params, var));
1496 params->cmask |= 1 << var;
1497 params->rmask |= 1 << var;
1498 return;
1499 }
1500 snd_BUG();
1501}
1502
Takashi Iwai877211f2005-11-17 13:59:38 +01001503void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504{
1505 unsigned int k;
1506 memset(params, 0, sizeof(*params));
1507 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1508 _snd_pcm_hw_param_any(params, k);
1509 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1510 _snd_pcm_hw_param_any(params, k);
1511 params->info = ~0U;
1512}
1513
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001514EXPORT_SYMBOL(_snd_pcm_hw_params_any);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515
1516/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001517 * snd_pcm_hw_param_value - return @params field @var value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001518 * @params: the hw_params instance
1519 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001520 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001522 * Return the value for field @var if it's fixed in configuration space
1523 * defined by @params. Return -%EINVAL otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001525int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1526 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527{
1528 if (hw_is_mask(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001529 const struct snd_mask *mask = hw_param_mask_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 if (!snd_mask_single(mask))
1531 return -EINVAL;
1532 if (dir)
1533 *dir = 0;
1534 return snd_mask_value(mask);
1535 }
1536 if (hw_is_interval(var)) {
Takashi Iwai877211f2005-11-17 13:59:38 +01001537 const struct snd_interval *i = hw_param_interval_c(params, var);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 if (!snd_interval_single(i))
1539 return -EINVAL;
1540 if (dir)
1541 *dir = i->openmin;
1542 return snd_interval_value(i);
1543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 return -EINVAL;
1545}
1546
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001547EXPORT_SYMBOL(snd_pcm_hw_param_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
Takashi Iwai877211f2005-11-17 13:59:38 +01001549void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 snd_pcm_hw_param_t var)
1551{
1552 if (hw_is_mask(var)) {
1553 snd_mask_none(hw_param_mask(params, var));
1554 params->cmask |= 1 << var;
1555 params->rmask |= 1 << var;
1556 } else if (hw_is_interval(var)) {
1557 snd_interval_none(hw_param_interval(params, var));
1558 params->cmask |= 1 << var;
1559 params->rmask |= 1 << var;
1560 } else {
1561 snd_BUG();
1562 }
1563}
1564
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001565EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
Takashi Iwai877211f2005-11-17 13:59:38 +01001567static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001568 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569{
1570 int changed;
1571 if (hw_is_mask(var))
1572 changed = snd_mask_refine_first(hw_param_mask(params, var));
1573 else if (hw_is_interval(var))
1574 changed = snd_interval_refine_first(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001575 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 if (changed) {
1578 params->cmask |= 1 << var;
1579 params->rmask |= 1 << var;
1580 }
1581 return changed;
1582}
1583
1584
1585/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001586 * snd_pcm_hw_param_first - refine config space and return minimum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001587 * @pcm: PCM instance
1588 * @params: the hw_params instance
1589 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001590 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001592 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 * values > minimum. Reduce configuration space accordingly.
1594 * Return the minimum.
1595 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001596int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1597 struct snd_pcm_hw_params *params,
1598 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599{
1600 int changed = _snd_pcm_hw_param_first(params, var);
1601 if (changed < 0)
1602 return changed;
1603 if (params->rmask) {
1604 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001605 if (snd_BUG_ON(err < 0))
1606 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 }
1608 return snd_pcm_hw_param_value(params, var, dir);
1609}
1610
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001611EXPORT_SYMBOL(snd_pcm_hw_param_first);
1612
Takashi Iwai877211f2005-11-17 13:59:38 +01001613static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
Adrian Bunk123992f2005-05-18 18:02:04 +02001614 snd_pcm_hw_param_t var)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615{
1616 int changed;
1617 if (hw_is_mask(var))
1618 changed = snd_mask_refine_last(hw_param_mask(params, var));
1619 else if (hw_is_interval(var))
1620 changed = snd_interval_refine_last(hw_param_interval(params, var));
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001621 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 if (changed) {
1624 params->cmask |= 1 << var;
1625 params->rmask |= 1 << var;
1626 }
1627 return changed;
1628}
1629
1630
1631/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001632 * snd_pcm_hw_param_last - refine config space and return maximum value
Takashi Iwaidf8db932005-09-07 13:38:19 +02001633 * @pcm: PCM instance
1634 * @params: the hw_params instance
1635 * @var: parameter to retrieve
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001636 * @dir: pointer to the direction (-1,0,1) or %NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001638 * Inside configuration space defined by @params remove from @var all
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 * values < maximum. Reduce configuration space accordingly.
1640 * Return the maximum.
1641 */
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001642int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1643 struct snd_pcm_hw_params *params,
1644 snd_pcm_hw_param_t var, int *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645{
1646 int changed = _snd_pcm_hw_param_last(params, var);
1647 if (changed < 0)
1648 return changed;
1649 if (params->rmask) {
1650 int err = snd_pcm_hw_refine(pcm, params);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001651 if (snd_BUG_ON(err < 0))
1652 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 }
1654 return snd_pcm_hw_param_value(params, var, dir);
1655}
1656
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001657EXPORT_SYMBOL(snd_pcm_hw_param_last);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658
1659/**
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001660 * snd_pcm_hw_param_choose - choose a configuration defined by @params
Takashi Iwaidf8db932005-09-07 13:38:19 +02001661 * @pcm: PCM instance
1662 * @params: the hw_params instance
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 *
Randy Dunlap1c85cc62008-10-15 14:38:40 -07001664 * Choose one configuration from configuration space defined by @params.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 * The configuration chosen is that obtained fixing in this order:
1666 * first access, first format, first subformat, min channels,
1667 * min rate, min period time, max buffer size, min tick time
1668 */
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001669int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1670 struct snd_pcm_hw_params *params)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671{
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001672 static int vars[] = {
1673 SNDRV_PCM_HW_PARAM_ACCESS,
1674 SNDRV_PCM_HW_PARAM_FORMAT,
1675 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1676 SNDRV_PCM_HW_PARAM_CHANNELS,
1677 SNDRV_PCM_HW_PARAM_RATE,
1678 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1679 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1680 SNDRV_PCM_HW_PARAM_TICK_TIME,
1681 -1
1682 };
1683 int err, *v;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001685 for (v = vars; *v != -1; v++) {
1686 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1687 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1688 else
1689 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001690 if (snd_BUG_ON(err < 0))
1691 return err;
Takashi Iwai2f4ca8e2006-04-28 15:13:40 +02001692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 return 0;
1694}
1695
Takashi Iwai877211f2005-11-17 13:59:38 +01001696static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 void *arg)
1698{
Takashi Iwai877211f2005-11-17 13:59:38 +01001699 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 unsigned long flags;
1701 snd_pcm_stream_lock_irqsave(substream, flags);
1702 if (snd_pcm_running(substream) &&
1703 snd_pcm_update_hw_ptr(substream) >= 0)
1704 runtime->status->hw_ptr %= runtime->buffer_size;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -05001705 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 runtime->status->hw_ptr = 0;
Pierre-Louis Bossart0e8014d2012-10-22 16:42:14 -05001707 runtime->hw_ptr_wrap = 0;
1708 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 snd_pcm_stream_unlock_irqrestore(substream, flags);
1710 return 0;
1711}
1712
Takashi Iwai877211f2005-11-17 13:59:38 +01001713static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 void *arg)
1715{
Takashi Iwai877211f2005-11-17 13:59:38 +01001716 struct snd_pcm_channel_info *info = arg;
1717 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 int width;
1719 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1720 info->offset = -1;
1721 return 0;
1722 }
1723 width = snd_pcm_format_physical_width(runtime->format);
1724 if (width < 0)
1725 return width;
1726 info->offset = 0;
1727 switch (runtime->access) {
1728 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1729 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1730 info->first = info->channel * width;
1731 info->step = runtime->channels * width;
1732 break;
1733 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1734 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1735 {
1736 size_t size = runtime->dma_bytes / runtime->channels;
1737 info->first = info->channel * size * 8;
1738 info->step = width;
1739 break;
1740 }
1741 default:
1742 snd_BUG();
1743 break;
1744 }
1745 return 0;
1746}
1747
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001748static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1749 void *arg)
1750{
1751 struct snd_pcm_hw_params *params = arg;
1752 snd_pcm_format_t format;
1753 int channels, width;
1754
1755 params->fifo_size = substream->runtime->hw.fifo_size;
1756 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1757 format = params_format(params);
1758 channels = params_channels(params);
1759 width = snd_pcm_format_physical_width(format);
1760 params->fifo_size /= width * channels;
1761 }
1762 return 0;
1763}
1764
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765/**
1766 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1767 * @substream: the pcm substream instance
1768 * @cmd: ioctl command
1769 * @arg: ioctl argument
1770 *
1771 * Processes the generic ioctl commands for PCM.
1772 * Can be passed as the ioctl callback for PCM ops.
1773 *
1774 * Returns zero if successful, or a negative error code on failure.
1775 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001776int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 unsigned int cmd, void *arg)
1778{
1779 switch (cmd) {
1780 case SNDRV_PCM_IOCTL1_INFO:
1781 return 0;
1782 case SNDRV_PCM_IOCTL1_RESET:
1783 return snd_pcm_lib_ioctl_reset(substream, arg);
1784 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1785 return snd_pcm_lib_ioctl_channel_info(substream, arg);
Jaroslav Kysela8bea8692009-04-27 09:44:40 +02001786 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1787 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 }
1789 return -ENXIO;
1790}
1791
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001792EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1793
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794/**
1795 * snd_pcm_period_elapsed - update the pcm status for the next period
1796 * @substream: the pcm substream instance
1797 *
1798 * This function is called from the interrupt handler when the
1799 * PCM has processed the period size. It will update the current
Takashi Iwai31e89602008-01-08 18:09:57 +01001800 * pointer, wake up sleepers, etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 *
1802 * Even if more than one periods have elapsed since the last call, you
1803 * have to call this only once.
1804 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001805void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806{
Takashi Iwai877211f2005-11-17 13:59:38 +01001807 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 unsigned long flags;
1809
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001810 if (PCM_RUNTIME_CHECK(substream))
1811 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813
1814 if (runtime->transfer_ack_begin)
1815 runtime->transfer_ack_begin(substream);
1816
1817 snd_pcm_stream_lock_irqsave(substream, flags);
1818 if (!snd_pcm_running(substream) ||
Jaroslav Kyselaf2404062010-01-05 17:19:34 +01001819 snd_pcm_update_hw_ptr0(substream, 1) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 goto _end;
1821
1822 if (substream->timer_running)
1823 snd_timer_interrupt(substream->timer, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 _end:
1825 snd_pcm_stream_unlock_irqrestore(substream, flags);
1826 if (runtime->transfer_ack_end)
1827 runtime->transfer_ack_end(substream);
1828 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1829}
1830
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001831EXPORT_SYMBOL(snd_pcm_period_elapsed);
1832
Takashi Iwai13075512008-01-08 18:08:14 +01001833/*
1834 * Wait until avail_min data becomes available
1835 * Returns a negative error code if any error occurs during operation.
1836 * The available space is stored on availp. When err = 0 and avail = 0
1837 * on the capture stream, it indicates the stream is in DRAINING state.
1838 */
David Dillow5daeba32010-06-27 00:13:20 +02001839static int wait_for_avail(struct snd_pcm_substream *substream,
Takashi Iwai13075512008-01-08 18:08:14 +01001840 snd_pcm_uframes_t *availp)
1841{
1842 struct snd_pcm_runtime *runtime = substream->runtime;
1843 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1844 wait_queue_t wait;
1845 int err = 0;
1846 snd_pcm_uframes_t avail = 0;
Takashi Iwaif2b36142011-05-26 08:09:38 +02001847 long wait_time, tout;
Takashi Iwai13075512008-01-08 18:08:14 +01001848
Arjan van de Ven763437a2011-09-15 08:49:25 +02001849 init_waitqueue_entry(&wait, current);
1850 set_current_state(TASK_INTERRUPTIBLE);
1851 add_wait_queue(&runtime->tsleep, &wait);
1852
Takashi Iwaif2b36142011-05-26 08:09:38 +02001853 if (runtime->no_period_wakeup)
1854 wait_time = MAX_SCHEDULE_TIMEOUT;
1855 else {
1856 wait_time = 10;
1857 if (runtime->rate) {
1858 long t = runtime->period_size * 2 / runtime->rate;
1859 wait_time = max(t, wait_time);
1860 }
1861 wait_time = msecs_to_jiffies(wait_time * 1000);
1862 }
Arjan van de Ven763437a2011-09-15 08:49:25 +02001863
Takashi Iwai13075512008-01-08 18:08:14 +01001864 for (;;) {
1865 if (signal_pending(current)) {
1866 err = -ERESTARTSYS;
1867 break;
1868 }
Arjan van de Ven763437a2011-09-15 08:49:25 +02001869
1870 /*
1871 * We need to check if space became available already
1872 * (and thus the wakeup happened already) first to close
1873 * the race of space already having become available.
1874 * This check must happen after been added to the waitqueue
1875 * and having current state be INTERRUPTIBLE.
1876 */
1877 if (is_playback)
1878 avail = snd_pcm_playback_avail(runtime);
1879 else
1880 avail = snd_pcm_capture_avail(runtime);
1881 if (avail >= runtime->twake)
1882 break;
Takashi Iwai13075512008-01-08 18:08:14 +01001883 snd_pcm_stream_unlock_irq(substream);
Arjan van de Ven763437a2011-09-15 08:49:25 +02001884
1885 tout = schedule_timeout(wait_time);
1886
Takashi Iwai13075512008-01-08 18:08:14 +01001887 snd_pcm_stream_lock_irq(substream);
Arjan van de Ven763437a2011-09-15 08:49:25 +02001888 set_current_state(TASK_INTERRUPTIBLE);
Takashi Iwai13075512008-01-08 18:08:14 +01001889 switch (runtime->status->state) {
1890 case SNDRV_PCM_STATE_SUSPENDED:
1891 err = -ESTRPIPE;
1892 goto _endloop;
1893 case SNDRV_PCM_STATE_XRUN:
1894 err = -EPIPE;
1895 goto _endloop;
1896 case SNDRV_PCM_STATE_DRAINING:
1897 if (is_playback)
1898 err = -EPIPE;
1899 else
1900 avail = 0; /* indicate draining */
1901 goto _endloop;
1902 case SNDRV_PCM_STATE_OPEN:
1903 case SNDRV_PCM_STATE_SETUP:
1904 case SNDRV_PCM_STATE_DISCONNECTED:
1905 err = -EBADFD;
1906 goto _endloop;
1907 }
1908 if (!tout) {
1909 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1910 is_playback ? "playback" : "capture");
1911 err = -EIO;
1912 break;
1913 }
Takashi Iwai13075512008-01-08 18:08:14 +01001914 }
1915 _endloop:
Arjan van de Ven763437a2011-09-15 08:49:25 +02001916 set_current_state(TASK_RUNNING);
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01001917 remove_wait_queue(&runtime->tsleep, &wait);
Takashi Iwai13075512008-01-08 18:08:14 +01001918 *availp = avail;
1919 return err;
1920}
1921
Takashi Iwai877211f2005-11-17 13:59:38 +01001922static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 unsigned int hwoff,
1924 unsigned long data, unsigned int off,
1925 snd_pcm_uframes_t frames)
1926{
Takashi Iwai877211f2005-11-17 13:59:38 +01001927 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 int err;
1929 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1930 if (substream->ops->copy) {
1931 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1932 return err;
1933 } else {
1934 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1936 return -EFAULT;
1937 }
1938 return 0;
1939}
1940
Takashi Iwai877211f2005-11-17 13:59:38 +01001941typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 unsigned long data, unsigned int off,
1943 snd_pcm_uframes_t size);
1944
Takashi Iwai877211f2005-11-17 13:59:38 +01001945static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 unsigned long data,
1947 snd_pcm_uframes_t size,
1948 int nonblock,
1949 transfer_f transfer)
1950{
Takashi Iwai877211f2005-11-17 13:59:38 +01001951 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 snd_pcm_uframes_t xfer = 0;
1953 snd_pcm_uframes_t offset = 0;
Takashi Iwai0910c212012-05-11 17:50:49 +02001954 snd_pcm_uframes_t avail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955 int err = 0;
1956
1957 if (size == 0)
1958 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959
1960 snd_pcm_stream_lock_irq(substream);
1961 switch (runtime->status->state) {
1962 case SNDRV_PCM_STATE_PREPARED:
1963 case SNDRV_PCM_STATE_RUNNING:
1964 case SNDRV_PCM_STATE_PAUSED:
1965 break;
1966 case SNDRV_PCM_STATE_XRUN:
1967 err = -EPIPE;
1968 goto _end_unlock;
1969 case SNDRV_PCM_STATE_SUSPENDED:
1970 err = -ESTRPIPE;
1971 goto _end_unlock;
1972 default:
1973 err = -EBADFD;
1974 goto _end_unlock;
1975 }
1976
David Dillow5daeba32010-06-27 00:13:20 +02001977 runtime->twake = runtime->control->avail_min ? : 1;
Takashi Iwai0910c212012-05-11 17:50:49 +02001978 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1979 snd_pcm_update_hw_ptr(substream);
1980 avail = snd_pcm_playback_avail(runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 while (size > 0) {
1982 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 snd_pcm_uframes_t cont;
Takashi Iwai13075512008-01-08 18:08:14 +01001984 if (!avail) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 if (nonblock) {
1986 err = -EAGAIN;
1987 goto _end_unlock;
1988 }
David Dillow5daeba32010-06-27 00:13:20 +02001989 runtime->twake = min_t(snd_pcm_uframes_t, size,
1990 runtime->control->avail_min ? : 1);
1991 err = wait_for_avail(substream, &avail);
Takashi Iwai13075512008-01-08 18:08:14 +01001992 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 frames = size > avail ? avail : size;
1996 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1997 if (frames > cont)
1998 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001999 if (snd_BUG_ON(!frames)) {
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002000 runtime->twake = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002001 snd_pcm_stream_unlock_irq(substream);
2002 return -EINVAL;
2003 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 appl_ptr = runtime->control->appl_ptr;
2005 appl_ofs = appl_ptr % runtime->buffer_size;
2006 snd_pcm_stream_unlock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002007 err = transfer(substream, appl_ofs, data, offset, frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 snd_pcm_stream_lock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002009 if (err < 0)
2010 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 switch (runtime->status->state) {
2012 case SNDRV_PCM_STATE_XRUN:
2013 err = -EPIPE;
2014 goto _end_unlock;
2015 case SNDRV_PCM_STATE_SUSPENDED:
2016 err = -ESTRPIPE;
2017 goto _end_unlock;
2018 default:
2019 break;
2020 }
2021 appl_ptr += frames;
2022 if (appl_ptr >= runtime->boundary)
2023 appl_ptr -= runtime->boundary;
2024 runtime->control->appl_ptr = appl_ptr;
2025 if (substream->ops->ack)
2026 substream->ops->ack(substream);
2027
2028 offset += frames;
2029 size -= frames;
2030 xfer += frames;
Takashi Iwai0910c212012-05-11 17:50:49 +02002031 avail -= frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2033 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2034 err = snd_pcm_start(substream);
2035 if (err < 0)
2036 goto _end_unlock;
2037 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 }
2039 _end_unlock:
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002040 runtime->twake = 0;
Jaroslav Kysela12509322010-01-07 15:36:31 +01002041 if (xfer > 0 && err >= 0)
2042 snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 snd_pcm_stream_unlock_irq(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2045}
2046
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002047/* sanity-check for read/write methods */
2048static int pcm_sanity_check(struct snd_pcm_substream *substream)
2049{
2050 struct snd_pcm_runtime *runtime;
2051 if (PCM_RUNTIME_CHECK(substream))
2052 return -ENXIO;
2053 runtime = substream->runtime;
2054 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2055 return -EINVAL;
2056 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2057 return -EBADFD;
2058 return 0;
2059}
2060
Takashi Iwai877211f2005-11-17 13:59:38 +01002061snd_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 -07002062{
Takashi Iwai877211f2005-11-17 13:59:38 +01002063 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002065 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002067 err = pcm_sanity_check(substream);
2068 if (err < 0)
2069 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02002071 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
2073 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2074 runtime->channels > 1)
2075 return -EINVAL;
2076 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2077 snd_pcm_lib_write_transfer);
2078}
2079
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02002080EXPORT_SYMBOL(snd_pcm_lib_write);
2081
Takashi Iwai877211f2005-11-17 13:59:38 +01002082static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 unsigned int hwoff,
2084 unsigned long data, unsigned int off,
2085 snd_pcm_uframes_t frames)
2086{
Takashi Iwai877211f2005-11-17 13:59:38 +01002087 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 int err;
2089 void __user **bufs = (void __user **)data;
2090 int channels = runtime->channels;
2091 int c;
2092 if (substream->ops->copy) {
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002093 if (snd_BUG_ON(!substream->ops->silence))
2094 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 for (c = 0; c < channels; ++c, ++bufs) {
2096 if (*bufs == NULL) {
2097 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2098 return err;
2099 } else {
2100 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2101 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2102 return err;
2103 }
2104 }
2105 } else {
2106 /* default transfer behaviour */
2107 size_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 for (c = 0; c < channels; ++c, ++bufs) {
2109 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2110 if (*bufs == NULL) {
2111 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2112 } else {
2113 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2114 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2115 return -EFAULT;
2116 }
2117 }
2118 }
2119 return 0;
2120}
2121
Takashi Iwai877211f2005-11-17 13:59:38 +01002122snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 void __user **bufs,
2124 snd_pcm_uframes_t frames)
2125{
Takashi Iwai877211f2005-11-17 13:59:38 +01002126 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002128 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002130 err = pcm_sanity_check(substream);
2131 if (err < 0)
2132 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02002134 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
2136 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2137 return -EINVAL;
2138 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2139 nonblock, snd_pcm_lib_writev_transfer);
2140}
2141
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02002142EXPORT_SYMBOL(snd_pcm_lib_writev);
2143
Takashi Iwai877211f2005-11-17 13:59:38 +01002144static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 unsigned int hwoff,
2146 unsigned long data, unsigned int off,
2147 snd_pcm_uframes_t frames)
2148{
Takashi Iwai877211f2005-11-17 13:59:38 +01002149 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 int err;
2151 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2152 if (substream->ops->copy) {
2153 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2154 return err;
2155 } else {
2156 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2158 return -EFAULT;
2159 }
2160 return 0;
2161}
2162
Takashi Iwai877211f2005-11-17 13:59:38 +01002163static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 unsigned long data,
2165 snd_pcm_uframes_t size,
2166 int nonblock,
2167 transfer_f transfer)
2168{
Takashi Iwai877211f2005-11-17 13:59:38 +01002169 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 snd_pcm_uframes_t xfer = 0;
2171 snd_pcm_uframes_t offset = 0;
Takashi Iwai0910c212012-05-11 17:50:49 +02002172 snd_pcm_uframes_t avail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 int err = 0;
2174
2175 if (size == 0)
2176 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177
2178 snd_pcm_stream_lock_irq(substream);
2179 switch (runtime->status->state) {
2180 case SNDRV_PCM_STATE_PREPARED:
2181 if (size >= runtime->start_threshold) {
2182 err = snd_pcm_start(substream);
2183 if (err < 0)
2184 goto _end_unlock;
2185 }
2186 break;
2187 case SNDRV_PCM_STATE_DRAINING:
2188 case SNDRV_PCM_STATE_RUNNING:
2189 case SNDRV_PCM_STATE_PAUSED:
2190 break;
2191 case SNDRV_PCM_STATE_XRUN:
2192 err = -EPIPE;
2193 goto _end_unlock;
2194 case SNDRV_PCM_STATE_SUSPENDED:
2195 err = -ESTRPIPE;
2196 goto _end_unlock;
2197 default:
2198 err = -EBADFD;
2199 goto _end_unlock;
2200 }
2201
David Dillow5daeba32010-06-27 00:13:20 +02002202 runtime->twake = runtime->control->avail_min ? : 1;
Takashi Iwai0910c212012-05-11 17:50:49 +02002203 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2204 snd_pcm_update_hw_ptr(substream);
2205 avail = snd_pcm_capture_avail(runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206 while (size > 0) {
2207 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 snd_pcm_uframes_t cont;
Takashi Iwai13075512008-01-08 18:08:14 +01002209 if (!avail) {
2210 if (runtime->status->state ==
2211 SNDRV_PCM_STATE_DRAINING) {
2212 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213 goto _end_unlock;
2214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 if (nonblock) {
2216 err = -EAGAIN;
2217 goto _end_unlock;
2218 }
David Dillow5daeba32010-06-27 00:13:20 +02002219 runtime->twake = min_t(snd_pcm_uframes_t, size,
2220 runtime->control->avail_min ? : 1);
2221 err = wait_for_avail(substream, &avail);
Takashi Iwai13075512008-01-08 18:08:14 +01002222 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 goto _end_unlock;
Takashi Iwai13075512008-01-08 18:08:14 +01002224 if (!avail)
2225 continue; /* draining */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 frames = size > avail ? avail : size;
2228 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2229 if (frames > cont)
2230 frames = cont;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002231 if (snd_BUG_ON(!frames)) {
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002232 runtime->twake = 0;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002233 snd_pcm_stream_unlock_irq(substream);
2234 return -EINVAL;
2235 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236 appl_ptr = runtime->control->appl_ptr;
2237 appl_ofs = appl_ptr % runtime->buffer_size;
2238 snd_pcm_stream_unlock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002239 err = transfer(substream, appl_ofs, data, offset, frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 snd_pcm_stream_lock_irq(substream);
Jaroslav Kysela12509322010-01-07 15:36:31 +01002241 if (err < 0)
2242 goto _end_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 switch (runtime->status->state) {
2244 case SNDRV_PCM_STATE_XRUN:
2245 err = -EPIPE;
2246 goto _end_unlock;
2247 case SNDRV_PCM_STATE_SUSPENDED:
2248 err = -ESTRPIPE;
2249 goto _end_unlock;
2250 default:
2251 break;
2252 }
2253 appl_ptr += frames;
2254 if (appl_ptr >= runtime->boundary)
2255 appl_ptr -= runtime->boundary;
2256 runtime->control->appl_ptr = appl_ptr;
2257 if (substream->ops->ack)
2258 substream->ops->ack(substream);
2259
2260 offset += frames;
2261 size -= frames;
2262 xfer += frames;
Takashi Iwai0910c212012-05-11 17:50:49 +02002263 avail -= frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 }
2265 _end_unlock:
Jaroslav Kyselac91a9882010-01-21 10:32:15 +01002266 runtime->twake = 0;
Jaroslav Kysela12509322010-01-07 15:36:31 +01002267 if (xfer > 0 && err >= 0)
2268 snd_pcm_update_state(substream, runtime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 snd_pcm_stream_unlock_irq(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2271}
2272
Takashi Iwai877211f2005-11-17 13:59:38 +01002273snd_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 -07002274{
Takashi Iwai877211f2005-11-17 13:59:38 +01002275 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002277 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002279 err = pcm_sanity_check(substream);
2280 if (err < 0)
2281 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 runtime = substream->runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02002283 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2285 return -EINVAL;
2286 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2287}
2288
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02002289EXPORT_SYMBOL(snd_pcm_lib_read);
2290
Takashi Iwai877211f2005-11-17 13:59:38 +01002291static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 unsigned int hwoff,
2293 unsigned long data, unsigned int off,
2294 snd_pcm_uframes_t frames)
2295{
Takashi Iwai877211f2005-11-17 13:59:38 +01002296 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 int err;
2298 void __user **bufs = (void __user **)data;
2299 int channels = runtime->channels;
2300 int c;
2301 if (substream->ops->copy) {
2302 for (c = 0; c < channels; ++c, ++bufs) {
2303 char __user *buf;
2304 if (*bufs == NULL)
2305 continue;
2306 buf = *bufs + samples_to_bytes(runtime, off);
2307 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2308 return err;
2309 }
2310 } else {
2311 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 for (c = 0; c < channels; ++c, ++bufs) {
2313 char *hwbuf;
2314 char __user *buf;
2315 if (*bufs == NULL)
2316 continue;
2317
2318 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2319 buf = *bufs + samples_to_bytes(runtime, off);
2320 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2321 return -EFAULT;
2322 }
2323 }
2324 return 0;
2325}
2326
Takashi Iwai877211f2005-11-17 13:59:38 +01002327snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 void __user **bufs,
2329 snd_pcm_uframes_t frames)
2330{
Takashi Iwai877211f2005-11-17 13:59:38 +01002331 struct snd_pcm_runtime *runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002332 int nonblock;
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002333 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334
Takashi Iwai7eaa9432008-08-08 17:09:09 +02002335 err = pcm_sanity_check(substream);
2336 if (err < 0)
2337 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2340 return -EBADFD;
2341
Takashi Iwai0df63e42006-04-28 15:13:41 +02002342 nonblock = !!(substream->f_flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2344 return -EINVAL;
2345 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2346}
2347
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348EXPORT_SYMBOL(snd_pcm_lib_readv);
Takashi Iwai2d3391e2012-07-27 18:27:00 +02002349
2350/*
2351 * standard channel mapping helpers
2352 */
2353
2354/* default channel maps for multi-channel playbacks, up to 8 channels */
2355const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2356 { .channels = 1,
Takashi Iwai5efbc262012-09-13 14:48:46 +02002357 .map = { SNDRV_CHMAP_MONO } },
Takashi Iwai2d3391e2012-07-27 18:27:00 +02002358 { .channels = 2,
2359 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2360 { .channels = 4,
2361 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2362 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2363 { .channels = 6,
2364 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2365 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2366 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2367 { .channels = 8,
2368 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2369 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2370 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2371 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2372 { }
2373};
2374EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2375
2376/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2377const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2378 { .channels = 1,
Takashi Iwai5efbc262012-09-13 14:48:46 +02002379 .map = { SNDRV_CHMAP_MONO } },
Takashi Iwai2d3391e2012-07-27 18:27:00 +02002380 { .channels = 2,
2381 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2382 { .channels = 4,
2383 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2384 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2385 { .channels = 6,
2386 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2387 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2388 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2389 { .channels = 8,
2390 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2391 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2392 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2393 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2394 { }
2395};
2396EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2397
2398static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2399{
2400 if (ch > info->max_channels)
2401 return false;
2402 return !info->channel_mask || (info->channel_mask & (1U << ch));
2403}
2404
2405static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2406 struct snd_ctl_elem_info *uinfo)
2407{
2408 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2409
2410 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2411 uinfo->count = 0;
2412 uinfo->count = info->max_channels;
2413 uinfo->value.integer.min = 0;
2414 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2415 return 0;
2416}
2417
2418/* get callback for channel map ctl element
2419 * stores the channel position firstly matching with the current channels
2420 */
2421static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2422 struct snd_ctl_elem_value *ucontrol)
2423{
2424 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2425 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2426 struct snd_pcm_substream *substream;
2427 const struct snd_pcm_chmap_elem *map;
2428
2429 if (snd_BUG_ON(!info->chmap))
2430 return -EINVAL;
2431 substream = snd_pcm_chmap_substream(info, idx);
2432 if (!substream)
2433 return -ENODEV;
2434 memset(ucontrol->value.integer.value, 0,
2435 sizeof(ucontrol->value.integer.value));
2436 if (!substream->runtime)
2437 return 0; /* no channels set */
2438 for (map = info->chmap; map->channels; map++) {
2439 int i;
2440 if (map->channels == substream->runtime->channels &&
2441 valid_chmap_channels(info, map->channels)) {
2442 for (i = 0; i < map->channels; i++)
2443 ucontrol->value.integer.value[i] = map->map[i];
2444 return 0;
2445 }
2446 }
2447 return -EINVAL;
2448}
2449
2450/* tlv callback for channel map ctl element
2451 * expands the pre-defined channel maps in a form of TLV
2452 */
2453static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2454 unsigned int size, unsigned int __user *tlv)
2455{
2456 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2457 const struct snd_pcm_chmap_elem *map;
2458 unsigned int __user *dst;
2459 int c, count = 0;
2460
2461 if (snd_BUG_ON(!info->chmap))
2462 return -EINVAL;
2463 if (size < 8)
2464 return -ENOMEM;
2465 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2466 return -EFAULT;
2467 size -= 8;
2468 dst = tlv + 2;
2469 for (map = info->chmap; map->channels; map++) {
2470 int chs_bytes = map->channels * 4;
2471 if (!valid_chmap_channels(info, map->channels))
2472 continue;
2473 if (size < 8)
2474 return -ENOMEM;
2475 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2476 put_user(chs_bytes, dst + 1))
2477 return -EFAULT;
2478 dst += 2;
2479 size -= 8;
2480 count += 8;
2481 if (size < chs_bytes)
2482 return -ENOMEM;
2483 size -= chs_bytes;
2484 count += chs_bytes;
2485 for (c = 0; c < map->channels; c++) {
2486 if (put_user(map->map[c], dst))
2487 return -EFAULT;
2488 dst++;
2489 }
2490 }
2491 if (put_user(count, tlv + 1))
2492 return -EFAULT;
2493 return 0;
2494}
2495
2496static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2497{
2498 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2499 info->pcm->streams[info->stream].chmap_kctl = NULL;
2500 kfree(info);
2501}
2502
2503/**
2504 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2505 * @pcm: the assigned PCM instance
2506 * @stream: stream direction
2507 * @chmap: channel map elements (for query)
2508 * @max_channels: the max number of channels for the stream
2509 * @private_value: the value passed to each kcontrol's private_value field
2510 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2511 *
2512 * Create channel-mapping control elements assigned to the given PCM stream(s).
2513 * Returns zero if succeed, or a negative error value.
2514 */
2515int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2516 const struct snd_pcm_chmap_elem *chmap,
2517 int max_channels,
2518 unsigned long private_value,
2519 struct snd_pcm_chmap **info_ret)
2520{
2521 struct snd_pcm_chmap *info;
2522 struct snd_kcontrol_new knew = {
2523 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2524 .access = SNDRV_CTL_ELEM_ACCESS_READ |
Takashi Iwai2d3391e2012-07-27 18:27:00 +02002525 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2526 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2527 .info = pcm_chmap_ctl_info,
2528 .get = pcm_chmap_ctl_get,
2529 .tlv.c = pcm_chmap_ctl_tlv,
2530 };
2531 int err;
2532
2533 info = kzalloc(sizeof(*info), GFP_KERNEL);
2534 if (!info)
2535 return -ENOMEM;
2536 info->pcm = pcm;
2537 info->stream = stream;
2538 info->chmap = chmap;
2539 info->max_channels = max_channels;
2540 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2541 knew.name = "Playback Channel Map";
2542 else
2543 knew.name = "Capture Channel Map";
2544 knew.device = pcm->device;
2545 knew.count = pcm->streams[stream].substream_count;
2546 knew.private_value = private_value;
2547 info->kctl = snd_ctl_new1(&knew, info);
2548 if (!info->kctl) {
2549 kfree(info);
2550 return -ENOMEM;
2551 }
2552 info->kctl->private_free = pcm_chmap_ctl_private_free;
2553 err = snd_ctl_add(pcm->card, info->kctl);
2554 if (err < 0)
2555 return err;
2556 pcm->streams[stream].chmap_kctl = info->kctl;
2557 if (info_ret)
2558 *info_ret = info;
2559 return 0;
2560}
2561EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);