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 00000000000..55bc55eb6e2 --- /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 + * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com + * + * 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. + * + * Revision history + * 17th Oct 2005 Initial version. + * + * Generic AC97 support. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <sound/driver.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/ac97_codec.h> +#include <sound/initval.h> +#include <sound/soc.h> + +#define AC97_VERSION "0.6" + +static int ac97_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->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_codec_dai ac97_dai = { + .name = "AC97 HiFi", + .playback = { + .stream_name = "AC97 Playback", + .channels_min = 1, + .channels_max = 2, + .rates = STD_AC97_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, + .capture = { + .stream_name = "AC97 Capture", + .channels_min = 1, + .channels_max = 2, + .rates = STD_AC97_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, + .ops = { + .prepare = ac97_prepare,}, +}; + +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 platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec; + struct snd_ac97_bus *ac97_bus; + struct snd_ac97_template ac97_template; + int ret = 0; + + printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); + + socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); + if (socdev->codec == NULL) + return -ENOMEM; + codec = socdev->codec; + mutex_init(&codec->mutex); + + codec->name = "AC97"; + codec->owner = THIS_MODULE; + codec->dai = &ac97_dai; + codec->num_dai = 1; + codec->write = ac97_write; + codec->read = ac97_read; + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + + /* register pcms */ + ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); + if(ret < 0) + goto err; + + /* add codec as bus device for standard ac97 */ + ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus); + if(ret < 0) + goto bus_err; + + memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); + ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); + if(ret < 0) + goto bus_err; + + ret = snd_soc_register_card(socdev); + if (ret < 0) + goto bus_err; + return 0; + +bus_err: + snd_soc_free_pcms(socdev); + +err: + kfree(socdev->codec->reg_cache); + kfree(socdev->codec); + socdev->codec = NULL; + return ret; +} + +static int ac97_soc_remove(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = socdev->codec; + + if(codec == NULL) + return 0; + + snd_soc_free_pcms(socdev); + kfree(socdev->codec->reg_cache); + kfree(socdev->codec); + + return 0; +} + +struct snd_soc_codec_device soc_codec_dev_ac97= { + .probe = ac97_soc_probe, + .remove = ac97_soc_remove, +}; + +EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); + +MODULE_DESCRIPTION("Soc Generic AC97 driver"); +MODULE_AUTHOR("Liam Girdwood"); +MODULE_LICENSE("GPL"); |