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