a68660e0c6
This patch fixes a bug whereby AC97 bus device data was being clobbered when AC97 codecs using the generic ac97_codec.c driver were being registered. Codecs that didn't use the generic driver were unaffected (e.g. WM9712, WM9713). Changes:- o Add new AC97 codec class for custom (or need bus dev registration) AC97 codecs. o Only register/deregister this custom codec device with the AC97 bus. The generic AC97 driver already does this for generic codec devices. This may be related to bug #3038 :- https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3038 Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
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* ac97.c -- ALSA Soc AC97 codec support
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*
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* Copyright 2005 Wolfson Microelectronics PLC.
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* Author: Liam Girdwood
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* liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Revision history
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* 17th Oct 2005 Initial version.
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*
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* Generic AC97 support.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/ac97_codec.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#define AC97_VERSION "0.6"
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static int ac97_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_device *socdev = rtd->socdev;
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struct snd_soc_codec *codec = socdev->codec;
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int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
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return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
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}
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#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
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struct snd_soc_codec_dai ac97_dai = {
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.name = "AC97 HiFi",
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.type = SND_SOC_DAI_AC97,
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.playback = {
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.stream_name = "AC97 Playback",
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.channels_min = 1,
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.channels_max = 2,
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.rates = STD_AC97_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.capture = {
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.stream_name = "AC97 Capture",
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.channels_min = 1,
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.channels_max = 2,
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.rates = STD_AC97_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = {
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.prepare = ac97_prepare,},
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};
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EXPORT_SYMBOL_GPL(ac97_dai);
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static unsigned int ac97_read(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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return soc_ac97_ops.read(codec->ac97, reg);
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}
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static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int val)
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{
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soc_ac97_ops.write(codec->ac97, reg, val);
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return 0;
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}
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static int ac97_soc_probe(struct platform_device *pdev)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec;
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struct snd_ac97_bus *ac97_bus;
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struct snd_ac97_template ac97_template;
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int ret = 0;
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printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
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socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
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if (socdev->codec == NULL)
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return -ENOMEM;
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codec = socdev->codec;
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mutex_init(&codec->mutex);
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codec->name = "AC97";
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codec->owner = THIS_MODULE;
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codec->dai = &ac97_dai;
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codec->num_dai = 1;
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codec->write = ac97_write;
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codec->read = ac97_read;
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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/* register pcms */
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ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
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if(ret < 0)
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goto err;
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/* add codec as bus device for standard ac97 */
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ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
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if(ret < 0)
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goto bus_err;
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memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
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ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
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if(ret < 0)
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goto bus_err;
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ret = snd_soc_register_card(socdev);
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if (ret < 0)
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goto bus_err;
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return 0;
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bus_err:
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snd_soc_free_pcms(socdev);
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err:
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kfree(socdev->codec->reg_cache);
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kfree(socdev->codec);
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socdev->codec = NULL;
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return ret;
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}
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static int ac97_soc_remove(struct platform_device *pdev)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec = socdev->codec;
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if(codec == NULL)
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return 0;
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snd_soc_free_pcms(socdev);
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kfree(socdev->codec->reg_cache);
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kfree(socdev->codec);
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return 0;
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}
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struct snd_soc_codec_device soc_codec_dev_ac97= {
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.probe = ac97_soc_probe,
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.remove = ac97_soc_remove,
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};
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EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
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MODULE_DESCRIPTION("Soc Generic AC97 driver");
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MODULE_AUTHOR("Liam Girdwood");
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MODULE_LICENSE("GPL");
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