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/kernel.h>
17 #include <linux/device.h>
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/ac97_codec.h>
21 #include <sound/initval.h>
22 #include <sound/soc.h>
25 #define AC97_VERSION "0.6"
27 static int ac97_prepare(struct snd_pcm_substream
*substream
)
29 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
30 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
31 struct snd_soc_device
*socdev
= rtd
->socdev
;
32 struct snd_soc_codec
*codec
= socdev
->codec
;
34 int reg
= (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
) ?
35 AC97_PCM_FRONT_DAC_RATE
: AC97_PCM_LR_ADC_RATE
;
36 return snd_ac97_set_rate(codec
->ac97
, reg
, runtime
->rate
);
39 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
40 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
43 struct snd_soc_dai ac97_dai
= {
45 .type
= SND_SOC_DAI_AC97
,
47 .stream_name
= "AC97 Playback",
50 .rates
= STD_AC97_RATES
,
51 .formats
= SNDRV_PCM_FMTBIT_S16_LE
,},
53 .stream_name
= "AC97 Capture",
56 .rates
= STD_AC97_RATES
,
57 .formats
= SNDRV_PCM_FMTBIT_S16_LE
,},
59 .prepare
= ac97_prepare
,},
61 EXPORT_SYMBOL_GPL(ac97_dai
);
63 static unsigned int ac97_read(struct snd_soc_codec
*codec
,
66 return soc_ac97_ops
.read(codec
->ac97
, reg
);
69 static int ac97_write(struct snd_soc_codec
*codec
, unsigned int reg
,
72 soc_ac97_ops
.write(codec
->ac97
, reg
, val
);
76 static int ac97_soc_probe(struct platform_device
*pdev
)
78 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
79 struct snd_soc_codec
*codec
;
80 struct snd_ac97_bus
*ac97_bus
;
81 struct snd_ac97_template ac97_template
;
84 printk(KERN_INFO
"AC97 SoC Audio Codec %s\n", AC97_VERSION
);
86 socdev
->codec
= kzalloc(sizeof(struct snd_soc_codec
), GFP_KERNEL
);
89 codec
= socdev
->codec
;
90 mutex_init(&codec
->mutex
);
93 codec
->owner
= THIS_MODULE
;
94 codec
->dai
= &ac97_dai
;
96 codec
->write
= ac97_write
;
97 codec
->read
= ac97_read
;
98 INIT_LIST_HEAD(&codec
->dapm_widgets
);
99 INIT_LIST_HEAD(&codec
->dapm_paths
);
102 ret
= snd_soc_new_pcms(socdev
, SNDRV_DEFAULT_IDX1
, SNDRV_DEFAULT_STR1
);
106 /* add codec as bus device for standard ac97 */
107 ret
= snd_ac97_bus(codec
->card
, 0, &soc_ac97_ops
, NULL
, &ac97_bus
);
111 memset(&ac97_template
, 0, sizeof(struct snd_ac97_template
));
112 ret
= snd_ac97_mixer(ac97_bus
, &ac97_template
, &codec
->ac97
);
116 ret
= snd_soc_register_card(socdev
);
122 snd_soc_free_pcms(socdev
);
125 kfree(socdev
->codec
->reg_cache
);
126 kfree(socdev
->codec
);
127 socdev
->codec
= NULL
;
131 static int ac97_soc_remove(struct platform_device
*pdev
)
133 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
134 struct snd_soc_codec
*codec
= socdev
->codec
;
139 snd_soc_free_pcms(socdev
);
140 kfree(socdev
->codec
->reg_cache
);
141 kfree(socdev
->codec
);
147 static int ac97_soc_suspend(struct platform_device
*pdev
, pm_message_t msg
)
149 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
151 snd_ac97_suspend(socdev
->codec
->ac97
);
156 static int ac97_soc_resume(struct platform_device
*pdev
)
158 struct snd_soc_device
*socdev
= platform_get_drvdata(pdev
);
160 snd_ac97_resume(socdev
->codec
->ac97
);
165 #define ac97_soc_suspend NULL
166 #define ac97_soc_resume NULL
169 struct snd_soc_codec_device soc_codec_dev_ac97
= {
170 .probe
= ac97_soc_probe
,
171 .remove
= ac97_soc_remove
,
172 .suspend
= ac97_soc_suspend
,
173 .resume
= ac97_soc_resume
,
175 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97
);
177 MODULE_DESCRIPTION("Soc Generic AC97 driver");
178 MODULE_AUTHOR("Liam Girdwood");
179 MODULE_LICENSE("GPL");