diff options
Diffstat (limited to 'sound/soc/codecs/ac97.c')
| -rw-r--r-- | sound/soc/codecs/ac97.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/sound/soc/codecs/ac97.c b/sound/soc/codecs/ac97.c new file mode 100644 index 000000000..d0ac723ee --- /dev/null +++ b/sound/soc/codecs/ac97.c @@ -0,0 +1,156 @@ +/* + * 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 <linux/module.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/ac97_codec.h> +#include <sound/initval.h> +#include <sound/soc.h> + +static const struct snd_soc_dapm_widget ac97_widgets[] = { + SND_SOC_DAPM_INPUT("RX"), + SND_SOC_DAPM_OUTPUT("TX"), +}; + +static const struct snd_soc_dapm_route ac97_routes[] = { + { "AC97 Capture", NULL, "RX" }, + { "TX", NULL, "AC97 Playback" }, +}; + +static int ac97_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_codec *codec = dai->codec; + struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); + + int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? + AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; + return snd_ac97_set_rate(ac97, reg, substream->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 const struct snd_soc_dai_ops ac97_dai_ops = { + .prepare = ac97_prepare, +}; + +static struct snd_soc_dai_driver ac97_dai = { + .name = "ac97-hifi", + .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 int ac97_soc_probe(struct snd_soc_codec *codec) +{ + struct snd_ac97 *ac97; + 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->component.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, &ac97); + if (ret < 0) + return ret; + + snd_soc_codec_set_drvdata(codec, ac97); + + return 0; +} + +#ifdef CONFIG_PM +static int ac97_soc_suspend(struct snd_soc_codec *codec) +{ + struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); + + snd_ac97_suspend(ac97); + + return 0; +} + +static int ac97_soc_resume(struct snd_soc_codec *codec) +{ + + struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); + + snd_ac97_resume(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 = { + .probe = ac97_soc_probe, + .suspend = ac97_soc_suspend, + .resume = ac97_soc_resume, + + .dapm_widgets = ac97_widgets, + .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), + .dapm_routes = ac97_routes, + .num_dapm_routes = ARRAY_SIZE(ac97_routes), +}; + +static int ac97_probe(struct platform_device *pdev) +{ + return snd_soc_register_codec(&pdev->dev, + &soc_codec_dev_ac97, &ac97_dai, 1); +} + +static int 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", + }, + + .probe = ac97_probe, + .remove = ac97_remove, +}; + +module_platform_driver(ac97_codec_driver); + +MODULE_DESCRIPTION("Soc Generic AC97 driver"); +MODULE_AUTHOR("Liam Girdwood"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ac97-codec"); |