2 * ac97.c -- ALSA Soc AC97 codec support
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 * Generic AC97 support.
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/kernel.h>
18 #include <linux/device.h>
19 #include <linux/module.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/ac97_codec.h>
23 #include <sound/initval.h>
24 #include <sound/soc.h>
26 static const struct snd_soc_dapm_widget ac97_widgets
[] = {
27 SND_SOC_DAPM_INPUT("RX"),
28 SND_SOC_DAPM_OUTPUT("TX"),
31 static const struct snd_soc_dapm_route ac97_routes
[] = {
32 { "AC97 Capture", NULL
, "RX" },
33 { "TX", NULL
, "AC97 Playback" },
36 static int ac97_prepare(struct snd_pcm_substream
*substream
,
37 struct snd_soc_dai
*dai
)
39 struct snd_soc_codec
*codec
= dai
->codec
;
40 struct snd_ac97
*ac97
= snd_soc_codec_get_drvdata(codec
);
42 int reg
= (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
) ?
43 AC97_PCM_FRONT_DAC_RATE
: AC97_PCM_LR_ADC_RATE
;
44 return snd_ac97_set_rate(ac97
, reg
, substream
->runtime
->rate
);
47 static const struct snd_soc_dai_ops ac97_dai_ops
= {
48 .prepare
= ac97_prepare
,
51 static struct snd_soc_dai_driver ac97_dai
= {
54 .stream_name
= "AC97 Playback",
57 .rates
= SNDRV_PCM_RATE_KNOT
,
58 .formats
= SND_SOC_STD_AC97_FMTS
,},
60 .stream_name
= "AC97 Capture",
63 .rates
= SNDRV_PCM_RATE_KNOT
,
64 .formats
= SND_SOC_STD_AC97_FMTS
,},
68 static int ac97_soc_probe(struct snd_soc_codec
*codec
)
70 struct snd_ac97
*ac97
;
71 struct snd_ac97_bus
*ac97_bus
;
72 struct snd_ac97_template ac97_template
;
75 /* add codec as bus device for standard ac97 */
76 ret
= snd_ac97_bus(codec
->component
.card
->snd_card
, 0, soc_ac97_ops
,
81 memset(&ac97_template
, 0, sizeof(struct snd_ac97_template
));
82 ret
= snd_ac97_mixer(ac97_bus
, &ac97_template
, &ac97
);
86 snd_soc_codec_set_drvdata(codec
, ac97
);
92 static int ac97_soc_suspend(struct snd_soc_codec
*codec
)
94 struct snd_ac97
*ac97
= snd_soc_codec_get_drvdata(codec
);
96 snd_ac97_suspend(ac97
);
101 static int ac97_soc_resume(struct snd_soc_codec
*codec
)
104 struct snd_ac97
*ac97
= snd_soc_codec_get_drvdata(codec
);
106 snd_ac97_resume(ac97
);
111 #define ac97_soc_suspend NULL
112 #define ac97_soc_resume NULL
115 static const struct snd_soc_codec_driver soc_codec_dev_ac97
= {
116 .probe
= ac97_soc_probe
,
117 .suspend
= ac97_soc_suspend
,
118 .resume
= ac97_soc_resume
,
120 .component_driver
= {
121 .dapm_widgets
= ac97_widgets
,
122 .num_dapm_widgets
= ARRAY_SIZE(ac97_widgets
),
123 .dapm_routes
= ac97_routes
,
124 .num_dapm_routes
= ARRAY_SIZE(ac97_routes
),
128 static int ac97_probe(struct platform_device
*pdev
)
130 return snd_soc_register_codec(&pdev
->dev
,
131 &soc_codec_dev_ac97
, &ac97_dai
, 1);
134 static int ac97_remove(struct platform_device
*pdev
)
136 snd_soc_unregister_codec(&pdev
->dev
);
140 static struct platform_driver ac97_codec_driver
= {
142 .name
= "ac97-codec",
146 .remove
= ac97_remove
,
149 module_platform_driver(ac97_codec_driver
);
151 MODULE_DESCRIPTION("Soc Generic AC97 driver");
152 MODULE_AUTHOR("Liam Girdwood");
153 MODULE_LICENSE("GPL");
154 MODULE_ALIAS("platform:ac97-codec");