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1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/time.h>
23#include <linux/gcd.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/timer.h>
27
28/*
29 * Timer functions
30 */
31
32void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
33{
34 unsigned long rate, mult, fsize, l, post;
35 struct snd_pcm_runtime *runtime = substream->runtime;
36
37 mult = 1000000000;
38 rate = runtime->rate;
39 if (snd_BUG_ON(!rate))
40 return;
41 l = gcd(mult, rate);
42 mult /= l;
43 rate /= l;
44 fsize = runtime->period_size;
45 if (snd_BUG_ON(!fsize))
46 return;
47 l = gcd(rate, fsize);
48 rate /= l;
49 fsize /= l;
50 post = 1;
51 while ((mult * fsize) / fsize != mult) {
52 mult /= 2;
53 post *= 2;
54 }
55 if (rate == 0) {
56 pcm_err(substream->pcm,
57 "pcm timer resolution out of range (rate = %u, period_size = %lu)\n",
58 runtime->rate, runtime->period_size);
59 runtime->timer_resolution = -1;
60 return;
61 }
62 runtime->timer_resolution = (mult * fsize / rate) * post;
63}
64
65static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
66{
67 struct snd_pcm_substream *substream;
68
69 substream = timer->private_data;
70 return substream->runtime ? substream->runtime->timer_resolution : 0;
71}
72
73static int snd_pcm_timer_start(struct snd_timer * timer)
74{
75 struct snd_pcm_substream *substream;
76
77 substream = snd_timer_chip(timer);
78 substream->timer_running = 1;
79 return 0;
80}
81
82static int snd_pcm_timer_stop(struct snd_timer * timer)
83{
84 struct snd_pcm_substream *substream;
85
86 substream = snd_timer_chip(timer);
87 substream->timer_running = 0;
88 return 0;
89}
90
91static struct snd_timer_hardware snd_pcm_timer =
92{
93 .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
94 .resolution = 0,
95 .ticks = 1,
96 .c_resolution = snd_pcm_timer_resolution,
97 .start = snd_pcm_timer_start,
98 .stop = snd_pcm_timer_stop,
99};
100
101/*
102 * Init functions
103 */
104
105static void snd_pcm_timer_free(struct snd_timer *timer)
106{
107 struct snd_pcm_substream *substream = timer->private_data;
108 substream->timer = NULL;
109}
110
111void snd_pcm_timer_init(struct snd_pcm_substream *substream)
112{
113 struct snd_timer_id tid;
114 struct snd_timer *timer;
115
116 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
117 tid.dev_class = SNDRV_TIMER_CLASS_PCM;
118 tid.card = substream->pcm->card->number;
119 tid.device = substream->pcm->device;
120 tid.subdevice = (substream->number << 1) | (substream->stream & 1);
121 if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
122 return;
123 sprintf(timer->name, "PCM %s %i-%i-%i",
124 substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
125 "capture" : "playback",
126 tid.card, tid.device, tid.subdevice);
127 timer->hw = snd_pcm_timer;
128 if (snd_device_register(timer->card, timer) < 0) {
129 snd_device_free(timer->card, timer);
130 return;
131 }
132 timer->private_data = substream;
133 timer->private_free = snd_pcm_timer_free;
134 substream->timer = timer;
135}
136
137void snd_pcm_timer_done(struct snd_pcm_substream *substream)
138{
139 if (substream->timer) {
140 snd_device_free(substream->pcm->card, substream->timer);
141 substream->timer = NULL;
142 }
143}
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/time.h>
23#include <linux/gcd.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/timer.h>
27
28#include "pcm_local.h"
29
30/*
31 * Timer functions
32 */
33
34void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
35{
36 unsigned long rate, mult, fsize, l, post;
37 struct snd_pcm_runtime *runtime = substream->runtime;
38
39 mult = 1000000000;
40 rate = runtime->rate;
41 if (snd_BUG_ON(!rate))
42 return;
43 l = gcd(mult, rate);
44 mult /= l;
45 rate /= l;
46 fsize = runtime->period_size;
47 if (snd_BUG_ON(!fsize))
48 return;
49 l = gcd(rate, fsize);
50 rate /= l;
51 fsize /= l;
52 post = 1;
53 while ((mult * fsize) / fsize != mult) {
54 mult /= 2;
55 post *= 2;
56 }
57 if (rate == 0) {
58 pcm_err(substream->pcm,
59 "pcm timer resolution out of range (rate = %u, period_size = %lu)\n",
60 runtime->rate, runtime->period_size);
61 runtime->timer_resolution = -1;
62 return;
63 }
64 runtime->timer_resolution = (mult * fsize / rate) * post;
65}
66
67static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
68{
69 struct snd_pcm_substream *substream;
70
71 substream = timer->private_data;
72 return substream->runtime ? substream->runtime->timer_resolution : 0;
73}
74
75static int snd_pcm_timer_start(struct snd_timer * timer)
76{
77 struct snd_pcm_substream *substream;
78
79 substream = snd_timer_chip(timer);
80 substream->timer_running = 1;
81 return 0;
82}
83
84static int snd_pcm_timer_stop(struct snd_timer * timer)
85{
86 struct snd_pcm_substream *substream;
87
88 substream = snd_timer_chip(timer);
89 substream->timer_running = 0;
90 return 0;
91}
92
93static struct snd_timer_hardware snd_pcm_timer =
94{
95 .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
96 .resolution = 0,
97 .ticks = 1,
98 .c_resolution = snd_pcm_timer_resolution,
99 .start = snd_pcm_timer_start,
100 .stop = snd_pcm_timer_stop,
101};
102
103/*
104 * Init functions
105 */
106
107static void snd_pcm_timer_free(struct snd_timer *timer)
108{
109 struct snd_pcm_substream *substream = timer->private_data;
110 substream->timer = NULL;
111}
112
113void snd_pcm_timer_init(struct snd_pcm_substream *substream)
114{
115 struct snd_timer_id tid;
116 struct snd_timer *timer;
117
118 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
119 tid.dev_class = SNDRV_TIMER_CLASS_PCM;
120 tid.card = substream->pcm->card->number;
121 tid.device = substream->pcm->device;
122 tid.subdevice = (substream->number << 1) | (substream->stream & 1);
123 if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
124 return;
125 sprintf(timer->name, "PCM %s %i-%i-%i",
126 substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
127 "capture" : "playback",
128 tid.card, tid.device, tid.subdevice);
129 timer->hw = snd_pcm_timer;
130 if (snd_device_register(timer->card, timer) < 0) {
131 snd_device_free(timer->card, timer);
132 return;
133 }
134 timer->private_data = substream;
135 timer->private_free = snd_pcm_timer_free;
136 substream->timer = timer;
137}
138
139void snd_pcm_timer_done(struct snd_pcm_substream *substream)
140{
141 if (substream->timer) {
142 snd_device_free(substream->pcm->card, substream->timer);
143 substream->timer = NULL;
144 }
145}