diff options
Diffstat (limited to 'sound/soc/codecs/ac97.c')
| -rw-r--r-- | sound/soc/codecs/ac97.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/sound/soc/codecs/ac97.c b/sound/soc/codecs/ac97.c new file mode 100644 index 00000000..3c087936 --- /dev/null +++ b/sound/soc/codecs/ac97.c @@ -0,0 +1,165 @@ +/* + * ac97.c -- ALSA Soc AC97 codec support + * + * Copyright 2005 Wolfson Microelectronics PLC. + * Author: Liam Girdwood <lrg@slimlogic.co.uk> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * Generic AC97 support. + */ + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/ac97_codec.h> +#include <sound/initval.h> +#include <sound/soc.h> + +static int ac97_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_codec *codec = rtd->codec; + + int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? + AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; + return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); +} + +#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ + SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ + SNDRV_PCM_RATE_48000) + +static struct snd_soc_dai_ops ac97_dai_ops = { + .prepare = ac97_prepare, +}; + +static struct snd_soc_dai_driver ac97_dai = { + .name = "ac97-hifi", + .ac97_control = 1, + .playback = { + .stream_name = "AC97 Playback", + .channels_min = 1, + .channels_max = 2, + .rates = STD_AC97_RATES, + .formats = SND_SOC_STD_AC97_FMTS,}, + .capture = { + .stream_name = "AC97 Capture", + .channels_min = 1, + .channels_max = 2, + .rates = STD_AC97_RATES, + .formats = SND_SOC_STD_AC97_FMTS,}, + .ops = &ac97_dai_ops, +}; + +static unsigned int ac97_read(struct snd_soc_codec *codec, + unsigned int reg) +{ + return soc_ac97_ops.read(codec->ac97, reg); +} + +static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, + unsigned int val) +{ + soc_ac97_ops.write(codec->ac97, reg, val); + return 0; +} + +static int ac97_soc_probe(struct snd_soc_codec *codec) +{ + struct snd_ac97_bus *ac97_bus; + struct snd_ac97_template ac97_template; + int ret; + + /* add codec as bus device for standard ac97 */ + ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus); + if (ret < 0) + return ret; + + memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); + ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); + if (ret < 0) + return ret; + + return 0; +} + +static int ac97_soc_remove(struct snd_soc_codec *codec) +{ + return 0; +} + +#ifdef CONFIG_PM +static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg) +{ + snd_ac97_suspend(codec->ac97); + + return 0; +} + +static int ac97_soc_resume(struct snd_soc_codec *codec) +{ + snd_ac97_resume(codec->ac97); + + return 0; +} +#else +#define ac97_soc_suspend NULL +#define ac97_soc_resume NULL +#endif + +static struct snd_soc_codec_driver soc_codec_dev_ac97 = { + .write = ac97_write, + .read = ac97_read, + .probe = ac97_soc_probe, + .remove = ac97_soc_remove, + .suspend = ac97_soc_suspend, + .resume = ac97_soc_resume, +}; + +static __devinit int ac97_probe(struct platform_device *pdev) +{ + return snd_soc_register_codec(&pdev->dev, + &soc_codec_dev_ac97, &ac97_dai, 1); +} + +static int __devexit ac97_remove(struct platform_device *pdev) +{ + snd_soc_unregister_codec(&pdev->dev); + return 0; +} + +static struct platform_driver ac97_codec_driver = { + .driver = { + .name = "ac97-codec", + .owner = THIS_MODULE, + }, + + .probe = ac97_probe, + .remove = __devexit_p(ac97_remove), +}; + +static int __init ac97_init(void) +{ + return platform_driver_register(&ac97_codec_driver); +} +module_init(ac97_init); + +static void __exit ac97_exit(void) +{ + platform_driver_unregister(&ac97_codec_driver); +} +module_exit(ac97_exit); + +MODULE_DESCRIPTION("Soc Generic AC97 driver"); +MODULE_AUTHOR("Liam Girdwood"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ac97-codec"); |