| /* |
| * 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; |
| |
| ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0); |
| if (ret < 0) { |
| printk(KERN_ERR "ASoC: failed to init generic ac97 glue\n"); |
| return 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"); |