1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ac97.c -- ALSA Soc AC97 codec support 4 * 5 * Copyright 2005 Wolfson Microelectronics PLC. 6 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 7 * 8 * Generic AC97 support. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/slab.h> 13 #include <linux/kernel.h> 14 #include <linux/device.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/ac97_codec.h> 20 #include <sound/initval.h> 21 #include <sound/soc.h> 22 23 static const struct snd_soc_dapm_widget ac97_widgets[] = { 24 SND_SOC_DAPM_INPUT("RX"), 25 SND_SOC_DAPM_OUTPUT("TX"), 26 }; 27 28 static const struct snd_soc_dapm_route ac97_routes[] = { 29 { "AC97 Capture", NULL, "RX" }, 30 { "TX", NULL, "AC97 Playback" }, 31 }; 32 33 static int ac97_prepare(struct snd_pcm_substream *substream, 34 struct snd_soc_dai *dai) 35 { 36 struct snd_soc_component *component = dai->component; 37 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 38 39 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 40 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 41 return snd_ac97_set_rate(ac97, reg, substream->runtime->rate); 42 } 43 44 static const struct snd_soc_dai_ops ac97_dai_ops = { 45 .prepare = ac97_prepare, 46 }; 47 48 static struct snd_soc_dai_driver ac97_dai = { 49 .name = "ac97-hifi", 50 .playback = { 51 .stream_name = "AC97 Playback", 52 .channels_min = 1, 53 .channels_max = 2, 54 .rates = SNDRV_PCM_RATE_KNOT, 55 .formats = SND_SOC_STD_AC97_FMTS,}, 56 .capture = { 57 .stream_name = "AC97 Capture", 58 .channels_min = 1, 59 .channels_max = 2, 60 .rates = SNDRV_PCM_RATE_KNOT, 61 .formats = SND_SOC_STD_AC97_FMTS,}, 62 .ops = &ac97_dai_ops, 63 }; 64 65 static int ac97_soc_probe(struct snd_soc_component *component) 66 { 67 struct snd_ac97 *ac97; 68 struct snd_ac97_bus *ac97_bus; 69 struct snd_ac97_template ac97_template; 70 int ret; 71 72 /* add codec as bus device for standard ac97 */ 73 ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops, 74 NULL, &ac97_bus); 75 if (ret < 0) 76 return ret; 77 78 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 79 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97); 80 if (ret < 0) 81 return ret; 82 83 snd_soc_component_set_drvdata(component, ac97); 84 85 return 0; 86 } 87 88 #ifdef CONFIG_PM 89 static int ac97_soc_suspend(struct snd_soc_component *component) 90 { 91 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 92 93 snd_ac97_suspend(ac97); 94 95 return 0; 96 } 97 98 static int ac97_soc_resume(struct snd_soc_component *component) 99 { 100 101 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 102 103 snd_ac97_resume(ac97); 104 105 return 0; 106 } 107 #else 108 #define ac97_soc_suspend NULL 109 #define ac97_soc_resume NULL 110 #endif 111 112 static const struct snd_soc_component_driver soc_component_dev_ac97 = { 113 .probe = ac97_soc_probe, 114 .suspend = ac97_soc_suspend, 115 .resume = ac97_soc_resume, 116 .dapm_widgets = ac97_widgets, 117 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), 118 .dapm_routes = ac97_routes, 119 .num_dapm_routes = ARRAY_SIZE(ac97_routes), 120 .idle_bias_on = 1, 121 .use_pmdown_time = 1, 122 .endianness = 1, 123 }; 124 125 static int ac97_probe(struct platform_device *pdev) 126 { 127 return devm_snd_soc_register_component(&pdev->dev, 128 &soc_component_dev_ac97, &ac97_dai, 1); 129 } 130 131 #ifdef CONFIG_OF 132 static const struct of_device_id ac97_codec_of_match[] = { 133 { .compatible = "realtek,alc203", }, 134 { } 135 }; 136 MODULE_DEVICE_TABLE(of, ac97_codec_of_match); 137 #endif 138 139 static struct platform_driver ac97_codec_driver = { 140 .driver = { 141 .name = "ac97-codec", 142 .of_match_table = of_match_ptr(ac97_codec_of_match), 143 }, 144 145 .probe = ac97_probe, 146 }; 147 148 module_platform_driver(ac97_codec_driver); 149 150 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 151 MODULE_AUTHOR("Liam Girdwood"); 152 MODULE_LICENSE("GPL"); 153 MODULE_ALIAS("platform:ac97-codec"); 154