1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec. 4 * 5 * Copyright (C) 2012 Atmel 6 * 7 * Author: Bo Shen <voice.shen@atmel.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/of_device.h> 14 15 #include <sound/soc.h> 16 17 #include "../codecs/wm8904.h" 18 #include "atmel_ssc_dai.h" 19 20 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = { 21 SND_SOC_DAPM_HP("Headphone Jack", NULL), 22 SND_SOC_DAPM_MIC("Mic", NULL), 23 SND_SOC_DAPM_LINE("Line In Jack", NULL), 24 }; 25 26 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream, 27 struct snd_pcm_hw_params *params) 28 { 29 struct snd_soc_pcm_runtime *rtd = substream->private_data; 30 struct snd_soc_dai *codec_dai = rtd->codec_dai; 31 int ret; 32 33 ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK, 34 32768, params_rate(params) * 256); 35 if (ret < 0) { 36 pr_err("%s - failed to set wm8904 codec PLL.", __func__); 37 return ret; 38 } 39 40 /* 41 * As here wm8904 use FLL output as its system clock 42 * so calling set_sysclk won't care freq parameter 43 * then we pass 0 44 */ 45 ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL, 46 0, SND_SOC_CLOCK_IN); 47 if (ret < 0) { 48 pr_err("%s -failed to set wm8904 SYSCLK\n", __func__); 49 return ret; 50 } 51 52 return 0; 53 } 54 55 static const struct snd_soc_ops atmel_asoc_wm8904_ops = { 56 .hw_params = atmel_asoc_wm8904_hw_params, 57 }; 58 59 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = { 60 .name = "WM8904", 61 .stream_name = "WM8904 PCM", 62 .codec_dai_name = "wm8904-hifi", 63 .dai_fmt = SND_SOC_DAIFMT_I2S 64 | SND_SOC_DAIFMT_NB_NF 65 | SND_SOC_DAIFMT_CBM_CFM, 66 .ops = &atmel_asoc_wm8904_ops, 67 }; 68 69 static struct snd_soc_card atmel_asoc_wm8904_card = { 70 .name = "atmel_asoc_wm8904", 71 .owner = THIS_MODULE, 72 .dai_link = &atmel_asoc_wm8904_dailink, 73 .num_links = 1, 74 .dapm_widgets = atmel_asoc_wm8904_dapm_widgets, 75 .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets), 76 .fully_routed = true, 77 }; 78 79 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev) 80 { 81 struct device_node *np = pdev->dev.of_node; 82 struct device_node *codec_np, *cpu_np; 83 struct snd_soc_card *card = &atmel_asoc_wm8904_card; 84 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 85 int ret; 86 87 if (!np) { 88 dev_err(&pdev->dev, "only device tree supported\n"); 89 return -EINVAL; 90 } 91 92 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 93 if (ret) { 94 dev_err(&pdev->dev, "failed to parse card name\n"); 95 return ret; 96 } 97 98 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing"); 99 if (ret) { 100 dev_err(&pdev->dev, "failed to parse audio routing\n"); 101 return ret; 102 } 103 104 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 105 if (!cpu_np) { 106 dev_err(&pdev->dev, "failed to get dai and pcm info\n"); 107 ret = -EINVAL; 108 return ret; 109 } 110 dailink->cpu_of_node = cpu_np; 111 dailink->platform_of_node = cpu_np; 112 of_node_put(cpu_np); 113 114 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 115 if (!codec_np) { 116 dev_err(&pdev->dev, "failed to get codec info\n"); 117 ret = -EINVAL; 118 return ret; 119 } 120 dailink->codec_of_node = codec_np; 121 of_node_put(codec_np); 122 123 return 0; 124 } 125 126 static int atmel_asoc_wm8904_probe(struct platform_device *pdev) 127 { 128 struct snd_soc_card *card = &atmel_asoc_wm8904_card; 129 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 130 int id, ret; 131 132 card->dev = &pdev->dev; 133 ret = atmel_asoc_wm8904_dt_init(pdev); 134 if (ret) { 135 dev_err(&pdev->dev, "failed to init dt info\n"); 136 return ret; 137 } 138 139 id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc"); 140 ret = atmel_ssc_set_audio(id); 141 if (ret != 0) { 142 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id); 143 return ret; 144 } 145 146 ret = snd_soc_register_card(card); 147 if (ret) { 148 dev_err(&pdev->dev, "snd_soc_register_card failed\n"); 149 goto err_set_audio; 150 } 151 152 return 0; 153 154 err_set_audio: 155 atmel_ssc_put_audio(id); 156 return ret; 157 } 158 159 static int atmel_asoc_wm8904_remove(struct platform_device *pdev) 160 { 161 struct snd_soc_card *card = platform_get_drvdata(pdev); 162 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 163 int id; 164 165 id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc"); 166 167 snd_soc_unregister_card(card); 168 atmel_ssc_put_audio(id); 169 170 return 0; 171 } 172 173 #ifdef CONFIG_OF 174 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = { 175 { .compatible = "atmel,asoc-wm8904", }, 176 { } 177 }; 178 MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids); 179 #endif 180 181 static struct platform_driver atmel_asoc_wm8904_driver = { 182 .driver = { 183 .name = "atmel-wm8904-audio", 184 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids), 185 .pm = &snd_soc_pm_ops, 186 }, 187 .probe = atmel_asoc_wm8904_probe, 188 .remove = atmel_asoc_wm8904_remove, 189 }; 190 191 module_platform_driver(atmel_asoc_wm8904_driver); 192 193 /* Module information */ 194 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>"); 195 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec"); 196 MODULE_LICENSE("GPL"); 197