/* * 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> #include "ac97.h" #define AC97_VERSION "0.6" 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_device *socdev = rtd->socdev; struct snd_soc_codec *codec = socdev->card->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, }; struct snd_soc_dai 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, }; EXPORT_SYMBOL_GPL(ac97_dai); 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_card *card = socdev->card; struct snd_soc_codec *codec; struct snd_ac97_bus *ac97_bus; struct snd_ac97_template ac97_template; int i; int ret = 0; printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); if (!socdev->card->codec) return -ENOMEM; codec = socdev->card->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; for (i = 0; i < card->num_links; i++) { if (card->dai_link[i].codec_dai->ac97_control) { snd_ac97_dev_add_pdata(codec->ac97, card->dai_link[i].cpu_dai->ac97_pdata); } } return 0; bus_err: snd_soc_free_pcms(socdev); err: kfree(socdev->card->codec); socdev->card->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->card->codec; if (!codec) return 0; snd_soc_free_pcms(socdev); kfree(socdev->card->codec); return 0; } #ifdef CONFIG_PM static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); snd_ac97_suspend(socdev->card->codec->ac97); return 0; } static int ac97_soc_resume(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); snd_ac97_resume(socdev->card->codec->ac97); return 0; } #else #define ac97_soc_suspend NULL #define ac97_soc_resume NULL #endif struct snd_soc_codec_device soc_codec_dev_ac97 = { .probe = ac97_soc_probe, .remove = ac97_soc_remove, .suspend = ac97_soc_suspend, .resume = ac97_soc_resume, }; EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); MODULE_DESCRIPTION("Soc Generic AC97 driver"); MODULE_AUTHOR("Liam Girdwood"); MODULE_LICENSE("GPL");