1 /* 2 * ac97.c -- ALSA Soc AC97 codec support 3 * 4 * Copyright 2005 Wolfson Microelectronics PLC. 5 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 * Generic AC97 support. 13 */ 14 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/device.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/ac97_codec.h> 21 #include <sound/initval.h> 22 #include <sound/soc.h> 23 #include "ac97.h" 24 25 #define AC97_VERSION "0.6" 26 27 static int ac97_prepare(struct snd_pcm_substream *substream) 28 { 29 struct snd_pcm_runtime *runtime = substream->runtime; 30 struct snd_soc_pcm_runtime *rtd = substream->private_data; 31 struct snd_soc_device *socdev = rtd->socdev; 32 struct snd_soc_codec *codec = socdev->codec; 33 34 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 35 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 36 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); 37 } 38 39 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 40 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 41 SNDRV_PCM_RATE_48000) 42 43 struct snd_soc_dai ac97_dai = { 44 .name = "AC97 HiFi", 45 .type = SND_SOC_DAI_AC97, 46 .playback = { 47 .stream_name = "AC97 Playback", 48 .channels_min = 1, 49 .channels_max = 2, 50 .rates = STD_AC97_RATES, 51 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 52 .capture = { 53 .stream_name = "AC97 Capture", 54 .channels_min = 1, 55 .channels_max = 2, 56 .rates = STD_AC97_RATES, 57 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 58 .ops = { 59 .prepare = ac97_prepare,}, 60 }; 61 EXPORT_SYMBOL_GPL(ac97_dai); 62 63 static unsigned int ac97_read(struct snd_soc_codec *codec, 64 unsigned int reg) 65 { 66 return soc_ac97_ops.read(codec->ac97, reg); 67 } 68 69 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 70 unsigned int val) 71 { 72 soc_ac97_ops.write(codec->ac97, reg, val); 73 return 0; 74 } 75 76 static int ac97_soc_probe(struct platform_device *pdev) 77 { 78 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 79 struct snd_soc_codec *codec; 80 struct snd_ac97_bus *ac97_bus; 81 struct snd_ac97_template ac97_template; 82 int ret = 0; 83 84 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); 85 86 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 87 if (!socdev->codec) 88 return -ENOMEM; 89 codec = socdev->codec; 90 mutex_init(&codec->mutex); 91 92 codec->name = "AC97"; 93 codec->owner = THIS_MODULE; 94 codec->dai = &ac97_dai; 95 codec->num_dai = 1; 96 codec->write = ac97_write; 97 codec->read = ac97_read; 98 INIT_LIST_HEAD(&codec->dapm_widgets); 99 INIT_LIST_HEAD(&codec->dapm_paths); 100 101 /* register pcms */ 102 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 103 if (ret < 0) 104 goto err; 105 106 /* add codec as bus device for standard ac97 */ 107 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus); 108 if (ret < 0) 109 goto bus_err; 110 111 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 112 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 113 if (ret < 0) 114 goto bus_err; 115 116 ret = snd_soc_register_card(socdev); 117 if (ret < 0) 118 goto bus_err; 119 return 0; 120 121 bus_err: 122 snd_soc_free_pcms(socdev); 123 124 err: 125 kfree(socdev->codec->reg_cache); 126 kfree(socdev->codec); 127 socdev->codec = NULL; 128 return ret; 129 } 130 131 static int ac97_soc_remove(struct platform_device *pdev) 132 { 133 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 134 struct snd_soc_codec *codec = socdev->codec; 135 136 if (!codec) 137 return 0; 138 139 snd_soc_free_pcms(socdev); 140 kfree(socdev->codec->reg_cache); 141 kfree(socdev->codec); 142 143 return 0; 144 } 145 146 #ifdef CONFIG_PM 147 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg) 148 { 149 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 150 151 snd_ac97_suspend(socdev->codec->ac97); 152 153 return 0; 154 } 155 156 static int ac97_soc_resume(struct platform_device *pdev) 157 { 158 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 159 160 snd_ac97_resume(socdev->codec->ac97); 161 162 return 0; 163 } 164 #else 165 #define ac97_soc_suspend NULL 166 #define ac97_soc_resume NULL 167 #endif 168 169 struct snd_soc_codec_device soc_codec_dev_ac97 = { 170 .probe = ac97_soc_probe, 171 .remove = ac97_soc_remove, 172 .suspend = ac97_soc_suspend, 173 .resume = ac97_soc_resume, 174 }; 175 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); 176 177 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 178 MODULE_AUTHOR("Liam Girdwood"); 179 MODULE_LICENSE("GPL"); 180