sound/soc/atmel/atmel_wm8904.c

   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 #include <linux/pinctrl/consumer.h>
  16
  17 #include <sound/soc.h>
  18
  19 #include "../codecs/wm8904.h"
  20 #include "atmel_ssc_dai.h"
  21
  22 #define MCLK_RATE 32768
  23
  24 static struct clk *mclk;
  25
  26 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
  27         SND_SOC_DAPM_HP("Headphone Jack", NULL),
  28         SND_SOC_DAPM_MIC("Mic", NULL),
  29         SND_SOC_DAPM_LINE("Line In Jack", NULL),
  30 };
  31
  32 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
  33                 struct snd_pcm_hw_params *params)
  34 {
  35         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  36         struct snd_soc_dai *codec_dai = rtd->codec_dai;
  37         int ret;
  38
  39         ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
  40                 32768, params_rate(params) * 256);
  41         if (ret < 0) {
  42                 pr_err("%s - failed to set wm8904 codec PLL.", __func__);
  43                 return ret;
  44         }
  45
  46         /*
  47          * As here wm8904 use FLL output as its system clock
  48          * so calling set_sysclk won't care freq parameter
  49          * then we pass 0
  50          */
  51         ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
  52                         0, SND_SOC_CLOCK_IN);
  53         if (ret < 0) {
  54                 pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static struct snd_soc_ops atmel_asoc_wm8904_ops = {
  62         .hw_params = atmel_asoc_wm8904_hw_params,
  63 };
  64
  65 static int atmel_set_bias_level(struct snd_soc_card *card,
  66                 struct snd_soc_dapm_context *dapm,
  67                 enum snd_soc_bias_level level)
  68 {
  69         if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
  70                 switch (level) {
  71                 case SND_SOC_BIAS_PREPARE:
  72                         clk_prepare_enable(mclk);
  73                         break;
  74                 case SND_SOC_BIAS_OFF:
  75                         clk_disable_unprepare(mclk);
  76                         break;
  77                 default:
  78                         break;
  79                 }
  80         }
  81
  82         return 0;
  83 };
  84
  85 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
  86         .name = "WM8904",
  87         .stream_name = "WM8904 PCM",
  88         .codec_dai_name = "wm8904-hifi",
  89         .dai_fmt = SND_SOC_DAIFMT_I2S
  90                 | SND_SOC_DAIFMT_NB_NF
  91                 | SND_SOC_DAIFMT_CBM_CFM,
  92         .ops = &atmel_asoc_wm8904_ops,
  93 };
  94
  95 static struct snd_soc_card atmel_asoc_wm8904_card = {
  96         .name = "atmel_asoc_wm8904",
  97         .owner = THIS_MODULE,
  98         .set_bias_level = atmel_set_bias_level,
  99         .dai_link = &atmel_asoc_wm8904_dailink,
 100         .num_links = 1,
 101         .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
 102         .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
 103         .fully_routed = true,
 104 };
 105
 106 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
 107 {
 108         struct device_node *np = pdev->dev.of_node;
 109         struct device_node *codec_np, *cpu_np;
 110         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
 111         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 112         int ret;
 113
 114         if (!np) {
 115                 dev_err(&pdev->dev, "only device tree supported\n");
 116                 return -EINVAL;
 117         }
 118
 119         ret = snd_soc_of_parse_card_name(card, "atmel,model");
 120         if (ret) {
 121                 dev_err(&pdev->dev, "failed to parse card name\n");
 122                 return ret;
 123         }
 124
 125         ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
 126         if (ret) {
 127                 dev_err(&pdev->dev, "failed to parse audio routing\n");
 128                 return ret;
 129         }
 130
 131         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 132         if (!cpu_np) {
 133                 dev_err(&pdev->dev, "failed to get dai and pcm info\n");
 134                 ret = -EINVAL;
 135                 return ret;
 136         }
 137         dailink->cpu_of_node = cpu_np;
 138         dailink->platform_of_node = cpu_np;
 139         of_node_put(cpu_np);
 140
 141         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 142         if (!codec_np) {
 143                 dev_err(&pdev->dev, "failed to get codec info\n");
 144                 ret = -EINVAL;
 145                 return ret;
 146         }
 147         dailink->codec_of_node = codec_np;
 148         of_node_put(codec_np);
 149
 150         return 0;
 151 }
 152
 153 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
 154 {
 155         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
 156         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 157         struct clk *clk_src;
 158         struct pinctrl *pinctrl;
 159         int id, ret;
 160
 161         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 162         if (IS_ERR(pinctrl)) {
 163                 dev_err(&pdev->dev, "failed to request pinctrl\n");
 164                 return PTR_ERR(pinctrl);
 165         }
 166
 167         card->dev = &pdev->dev;
 168         ret = atmel_asoc_wm8904_dt_init(pdev);
 169         if (ret) {
 170                 dev_err(&pdev->dev, "failed to init dt info\n");
 171                 return ret;
 172         }
 173
 174         id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
 175         ret = atmel_ssc_set_audio(id);
 176         if (ret != 0) {
 177                 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
 178                 return ret;
 179         }
 180
 181         mclk = clk_get(NULL, "pck0");
 182         if (IS_ERR(mclk)) {
 183                 dev_err(&pdev->dev, "failed to get pck0\n");
 184                 ret = PTR_ERR(mclk);
 185                 goto err_set_audio;
 186         }
 187
 188         clk_src = clk_get(NULL, "clk32k");
 189         if (IS_ERR(clk_src)) {
 190                 dev_err(&pdev->dev, "failed to get clk32k\n");
 191                 ret = PTR_ERR(clk_src);
 192                 goto err_set_audio;
 193         }
 194
 195         ret = clk_set_parent(mclk, clk_src);
 196         clk_put(clk_src);
 197         if (ret != 0) {
 198                 dev_err(&pdev->dev, "failed to set MCLK parent\n");
 199                 goto err_set_audio;
 200         }
 201
 202         dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);
 203         clk_set_rate(mclk, MCLK_RATE);
 204
 205         ret = snd_soc_register_card(card);
 206         if (ret) {
 207                 dev_err(&pdev->dev, "snd_soc_register_card failed\n");
 208                 goto err_set_audio;
 209         }
 210
 211         return 0;
 212
 213 err_set_audio:
 214         atmel_ssc_put_audio(id);
 215         return ret;
 216 }
 217
 218 static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
 219 {
 220         struct snd_soc_card *card = platform_get_drvdata(pdev);
 221         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 222         int id;
 223
 224         id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
 225
 226         snd_soc_unregister_card(card);
 227         atmel_ssc_put_audio(id);
 228
 229         return 0;
 230 }
 231
 232 #ifdef CONFIG_OF
 233 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
 234         { .compatible = "atmel,asoc-wm8904", },
 235         { }
 236 };
 237 #endif
 238
 239 static struct platform_driver atmel_asoc_wm8904_driver = {
 240         .driver = {
 241                 .name = "atmel-wm8904-audio",
 242                 .owner = THIS_MODULE,
 243                 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
 244         },
 245         .probe = atmel_asoc_wm8904_probe,
 246         .remove = atmel_asoc_wm8904_remove,
 247 };
 248
 249 module_platform_driver(atmel_asoc_wm8904_driver);
 250
 251 /* Module information */
 252 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
 253 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
 254 MODULE_LICENSE("GPL");