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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | /* * 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) struct snd_soc_codec_dai ac97_dai = { .name = "AC97 HiFi", .type = SND_SOC_DAI_AC97, .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,}, }; 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_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"); |