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 <sound/core.h> 17 #include <sound/pcm.h> 18 #include <sound/ac97_codec.h> 19 #include <sound/initval.h> 20 #include <sound/soc.h> 21 22 static const struct snd_soc_dapm_widget ac97_widgets[] = { 23 SND_SOC_DAPM_INPUT("RX"), 24 SND_SOC_DAPM_OUTPUT("TX"), 25 }; 26 27 static const struct snd_soc_dapm_route ac97_routes[] = { 28 { "AC97 Capture", NULL, "RX" }, 29 { "TX", NULL, "AC97 Playback" }, 30 }; 31 32 static int ac97_prepare(struct snd_pcm_substream *substream, 33 struct snd_soc_dai *dai) 34 { 35 struct snd_soc_component *component = dai->component; 36 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 37 38 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 39 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 40 return snd_ac97_set_rate(ac97, reg, substream->runtime->rate); 41 } 42 43 static const struct snd_soc_dai_ops ac97_dai_ops = { 44 .prepare = ac97_prepare, 45 }; 46 47 static struct snd_soc_dai_driver ac97_dai = { 48 .name = "ac97-hifi", 49 .playback = { 50 .stream_name = "AC97 Playback", 51 .channels_min = 1, 52 .channels_max = 2, 53 .rates = SNDRV_PCM_RATE_KNOT, 54 .formats = SND_SOC_STD_AC97_FMTS,}, 55 .capture = { 56 .stream_name = "AC97 Capture", 57 .channels_min = 1, 58 .channels_max = 2, 59 .rates = SNDRV_PCM_RATE_KNOT, 60 .formats = SND_SOC_STD_AC97_FMTS,}, 61 .ops = &ac97_dai_ops, 62 }; 63 64 static int ac97_soc_probe(struct snd_soc_component *component) 65 { 66 struct snd_ac97 *ac97; 67 struct snd_ac97_bus *ac97_bus; 68 struct snd_ac97_template ac97_template; 69 int ret; 70 71 /* add codec as bus device for standard ac97 */ 72 ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops, 73 NULL, &ac97_bus); 74 if (ret < 0) 75 return ret; 76 77 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 78 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97); 79 if (ret < 0) 80 return ret; 81 82 snd_soc_component_set_drvdata(component, ac97); 83 84 return 0; 85 } 86 87 #ifdef CONFIG_PM 88 static int ac97_soc_suspend(struct snd_soc_component *component) 89 { 90 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 91 92 snd_ac97_suspend(ac97); 93 94 return 0; 95 } 96 97 static int ac97_soc_resume(struct snd_soc_component *component) 98 { 99 100 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component); 101 102 snd_ac97_resume(ac97); 103 104 return 0; 105 } 106 #else 107 #define ac97_soc_suspend NULL 108 #define ac97_soc_resume NULL 109 #endif 110 111 static const struct snd_soc_component_driver soc_component_dev_ac97 = { 112 .probe = ac97_soc_probe, 113 .suspend = ac97_soc_suspend, 114 .resume = ac97_soc_resume, 115 .dapm_widgets = ac97_widgets, 116 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), 117 .dapm_routes = ac97_routes, 118 .num_dapm_routes = ARRAY_SIZE(ac97_routes), 119 .idle_bias_on = 1, 120 .use_pmdown_time = 1, 121 .endianness = 1, 122 }; 123 124 static int ac97_probe(struct platform_device *pdev) 125 { 126 return devm_snd_soc_register_component(&pdev->dev, 127 &soc_component_dev_ac97, &ac97_dai, 1); 128 } 129 130 static int ac97_remove(struct platform_device *pdev) 131 { 132 return 0; 133 } 134 135 static struct platform_driver ac97_codec_driver = { 136 .driver = { 137 .name = "ac97-codec", 138 }, 139 140 .probe = ac97_probe, 141 .remove = ac97_remove, 142 }; 143 144 module_platform_driver(ac97_codec_driver); 145 146 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 147 MODULE_AUTHOR("Liam Girdwood"); 148 MODULE_LICENSE("GPL"); 149 MODULE_ALIAS("platform:ac97-codec"); 150