sound/soc/atmel/atmel_wm8904.c

   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 SND_SOC_DAILINK_DEFS(pcm,
  60         DAILINK_COMP_ARRAY(COMP_EMPTY()),
  61         DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8904-hifi")),
  62         DAILINK_COMP_ARRAY(COMP_EMPTY()));
  63
  64 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
  65         .name = "WM8904",
  66         .stream_name = "WM8904 PCM",
  67         .dai_fmt = SND_SOC_DAIFMT_I2S
  68                 | SND_SOC_DAIFMT_NB_NF
  69                 | SND_SOC_DAIFMT_CBM_CFM,
  70         .ops = &atmel_asoc_wm8904_ops,
  71         SND_SOC_DAILINK_REG(pcm),
  72 };
  73
  74 static struct snd_soc_card atmel_asoc_wm8904_card = {
  75         .name = "atmel_asoc_wm8904",
  76         .owner = THIS_MODULE,
  77         .dai_link = &atmel_asoc_wm8904_dailink,
  78         .num_links = 1,
  79         .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
  80         .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
  81         .fully_routed = true,
  82 };
  83
  84 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
  85 {
  86         struct device_node *np = pdev->dev.of_node;
  87         struct device_node *codec_np, *cpu_np;
  88         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
  89         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
  90         int ret;
  91
  92         if (!np) {
  93                 dev_err(&pdev->dev, "only device tree supported\n");
  94                 return -EINVAL;
  95         }
  96
  97         ret = snd_soc_of_parse_card_name(card, "atmel,model");
  98         if (ret) {
  99                 dev_err(&pdev->dev, "failed to parse card name\n");
 100                 return ret;
 101         }
 102
 103         ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
 104         if (ret) {
 105                 dev_err(&pdev->dev, "failed to parse audio routing\n");
 106                 return ret;
 107         }
 108
 109         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 110         if (!cpu_np) {
 111                 dev_err(&pdev->dev, "failed to get dai and pcm info\n");
 112                 ret = -EINVAL;
 113                 return ret;
 114         }
 115         dailink->cpus->of_node = cpu_np;
 116         dailink->platforms->of_node = cpu_np;
 117         of_node_put(cpu_np);
 118
 119         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 120         if (!codec_np) {
 121                 dev_err(&pdev->dev, "failed to get codec info\n");
 122                 ret = -EINVAL;
 123                 return ret;
 124         }
 125         dailink->codecs->of_node = codec_np;
 126         of_node_put(codec_np);
 127
 128         return 0;
 129 }
 130
 131 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
 132 {
 133         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
 134         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 135         int id, ret;
 136
 137         card->dev = &pdev->dev;
 138         ret = atmel_asoc_wm8904_dt_init(pdev);
 139         if (ret) {
 140                 dev_err(&pdev->dev, "failed to init dt info\n");
 141                 return ret;
 142         }
 143
 144         id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
 145         ret = atmel_ssc_set_audio(id);
 146         if (ret != 0) {
 147                 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
 148                 return ret;
 149         }
 150
 151         ret = snd_soc_register_card(card);
 152         if (ret) {
 153                 dev_err(&pdev->dev, "snd_soc_register_card failed\n");
 154                 goto err_set_audio;
 155         }
 156
 157         return 0;
 158
 159 err_set_audio:
 160         atmel_ssc_put_audio(id);
 161         return ret;
 162 }
 163
 164 static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
 165 {
 166         struct snd_soc_card *card = platform_get_drvdata(pdev);
 167         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 168         int id;
 169
 170         id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
 171
 172         snd_soc_unregister_card(card);
 173         atmel_ssc_put_audio(id);
 174
 175         return 0;
 176 }
 177
 178 #ifdef CONFIG_OF
 179 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
 180         { .compatible = "atmel,asoc-wm8904", },
 181         { }
 182 };
 183 MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
 184 #endif
 185
 186 static struct platform_driver atmel_asoc_wm8904_driver = {
 187         .driver = {
 188                 .name = "atmel-wm8904-audio",
 189                 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
 190                 .pm             = &snd_soc_pm_ops,
 191         },
 192         .probe = atmel_asoc_wm8904_probe,
 193         .remove = atmel_asoc_wm8904_remove,
 194 };
 195
 196 module_platform_driver(atmel_asoc_wm8904_driver);
 197
 198 /* Module information */
 199 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
 200 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
 201 MODULE_LICENSE("GPL");