1 /* 2 * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec. 3 * 4 * Copyright (C) 2012 Atmel 5 * 6 * Author: Bo Shen <voice.shen@atmel.com> 7 * 8 * GPLv2 or later 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_device.h> 15 16 #include <sound/soc.h> 17 18 #include "../codecs/wm8904.h" 19 #include "atmel_ssc_dai.h" 20 21 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = { 22 SND_SOC_DAPM_HP("Headphone Jack", NULL), 23 SND_SOC_DAPM_MIC("Mic", NULL), 24 SND_SOC_DAPM_LINE("Line In Jack", NULL), 25 }; 26 27 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream, 28 struct snd_pcm_hw_params *params) 29 { 30 struct snd_soc_pcm_runtime *rtd = substream->private_data; 31 struct snd_soc_dai *codec_dai = rtd->codec_dai; 32 int ret; 33 34 ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK, 35 32768, params_rate(params) * 256); 36 if (ret < 0) { 37 pr_err("%s - failed to set wm8904 codec PLL.", __func__); 38 return ret; 39 } 40 41 /* 42 * As here wm8904 use FLL output as its system clock 43 * so calling set_sysclk won't care freq parameter 44 * then we pass 0 45 */ 46 ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL, 47 0, SND_SOC_CLOCK_IN); 48 if (ret < 0) { 49 pr_err("%s -failed to set wm8904 SYSCLK\n", __func__); 50 return ret; 51 } 52 53 return 0; 54 } 55 56 static struct snd_soc_ops atmel_asoc_wm8904_ops = { 57 .hw_params = atmel_asoc_wm8904_hw_params, 58 }; 59 60 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = { 61 .name = "WM8904", 62 .stream_name = "WM8904 PCM", 63 .codec_dai_name = "wm8904-hifi", 64 .dai_fmt = SND_SOC_DAIFMT_I2S 65 | SND_SOC_DAIFMT_NB_NF 66 | SND_SOC_DAIFMT_CBM_CFM, 67 .ops = &atmel_asoc_wm8904_ops, 68 }; 69 70 static struct snd_soc_card atmel_asoc_wm8904_card = { 71 .name = "atmel_asoc_wm8904", 72 .owner = THIS_MODULE, 73 .dai_link = &atmel_asoc_wm8904_dailink, 74 .num_links = 1, 75 .dapm_widgets = atmel_asoc_wm8904_dapm_widgets, 76 .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets), 77 .fully_routed = true, 78 }; 79 80 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev) 81 { 82 struct device_node *np = pdev->dev.of_node; 83 struct device_node *codec_np, *cpu_np; 84 struct snd_soc_card *card = &atmel_asoc_wm8904_card; 85 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 86 int ret; 87 88 if (!np) { 89 dev_err(&pdev->dev, "only device tree supported\n"); 90 return -EINVAL; 91 } 92 93 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 94 if (ret) { 95 dev_err(&pdev->dev, "failed to parse card name\n"); 96 return ret; 97 } 98 99 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing"); 100 if (ret) { 101 dev_err(&pdev->dev, "failed to parse audio routing\n"); 102 return ret; 103 } 104 105 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 106 if (!cpu_np) { 107 dev_err(&pdev->dev, "failed to get dai and pcm info\n"); 108 ret = -EINVAL; 109 return ret; 110 } 111 dailink->cpu_of_node = cpu_np; 112 dailink->platform_of_node = cpu_np; 113 of_node_put(cpu_np); 114 115 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 116 if (!codec_np) { 117 dev_err(&pdev->dev, "failed to get codec info\n"); 118 ret = -EINVAL; 119 return ret; 120 } 121 dailink->codec_of_node = codec_np; 122 of_node_put(codec_np); 123 124 return 0; 125 } 126 127 static int atmel_asoc_wm8904_probe(struct platform_device *pdev) 128 { 129 struct snd_soc_card *card = &atmel_asoc_wm8904_card; 130 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 131 int id, ret; 132 133 card->dev = &pdev->dev; 134 ret = atmel_asoc_wm8904_dt_init(pdev); 135 if (ret) { 136 dev_err(&pdev->dev, "failed to init dt info\n"); 137 return ret; 138 } 139 140 id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc"); 141 ret = atmel_ssc_set_audio(id); 142 if (ret != 0) { 143 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id); 144 return ret; 145 } 146 147 ret = snd_soc_register_card(card); 148 if (ret) { 149 dev_err(&pdev->dev, "snd_soc_register_card failed\n"); 150 goto err_set_audio; 151 } 152 153 return 0; 154 155 err_set_audio: 156 atmel_ssc_put_audio(id); 157 return ret; 158 } 159 160 static int atmel_asoc_wm8904_remove(struct platform_device *pdev) 161 { 162 struct snd_soc_card *card = platform_get_drvdata(pdev); 163 struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink; 164 int id; 165 166 id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc"); 167 168 snd_soc_unregister_card(card); 169 atmel_ssc_put_audio(id); 170 171 return 0; 172 } 173 174 #ifdef CONFIG_OF 175 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = { 176 { .compatible = "atmel,asoc-wm8904", }, 177 { } 178 }; 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 }, 186 .probe = atmel_asoc_wm8904_probe, 187 .remove = atmel_asoc_wm8904_remove, 188 }; 189 190 module_platform_driver(atmel_asoc_wm8904_driver); 191 192 /* Module information */ 193 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>"); 194 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec"); 195 MODULE_LICENSE("GPL"); 196