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 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 MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
 180 #endif
 181
 182 static struct platform_driver atmel_asoc_wm8904_driver = {
 183         .driver = {
 184                 .name = "atmel-wm8904-audio",
 185                 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
 186                 .pm             = &snd_soc_pm_ops,
 187         },
 188         .probe = atmel_asoc_wm8904_probe,
 189         .remove = atmel_asoc_wm8904_remove,
 190 };
 191
 192 module_platform_driver(atmel_asoc_wm8904_driver);
 193
 194 /* Module information */
 195 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
 196 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
 197 MODULE_LICENSE("GPL");