/* * 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); } 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 = SNDRV_PCM_RATE_KNOT, .formats = SND_SOC_STD_AC97_FMTS,}, .capture = { .stream_name = "AC97 Capture", .channels_min = 1, .channels_max = 2, .rates = SNDRV_PCM_RATE_KNOT, .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");