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
  14 #include <sound/soc.h>
  15
  16 #include "../codecs/wm8904.h"
  17 #include "atmel_ssc_dai.h"
  18
  19 static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
  20         SND_SOC_DAPM_HP("Headphone Jack", NULL),
  21         SND_SOC_DAPM_MIC("Mic", NULL),
  22         SND_SOC_DAPM_LINE("Line In Jack", NULL),
  23 };
  24
  25 static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
  26                 struct snd_pcm_hw_params *params)
  27 {
  28         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  29         struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
  30         int ret;
  31
  32         ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
  33                 32768, params_rate(params) * 256);
  34         if (ret < 0) {
  35                 pr_err("%s - failed to set wm8904 codec PLL.", __func__);
  36                 return ret;
  37         }
  38
  39         /*
  40          * As here wm8904 use FLL output as its system clock
  41          * so calling set_sysclk won't care freq parameter
  42          * then we pass 0
  43          */
  44         ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
  45                         0, SND_SOC_CLOCK_IN);
  46         if (ret < 0) {
  47                 pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
  48                 return ret;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static const struct snd_soc_ops atmel_asoc_wm8904_ops = {
  55         .hw_params = atmel_asoc_wm8904_hw_params,
  56 };
  57
  58 SND_SOC_DAILINK_DEFS(pcm,
  59         DAILINK_COMP_ARRAY(COMP_EMPTY()),
  60         DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8904-hifi")),
  61         DAILINK_COMP_ARRAY(COMP_EMPTY()));
  62
  63 static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
  64         .name = "WM8904",
  65         .stream_name = "WM8904 PCM",
  66         .dai_fmt = SND_SOC_DAIFMT_I2S
  67                 | SND_SOC_DAIFMT_NB_NF
  68                 | SND_SOC_DAIFMT_CBP_CFP,
  69         .ops = &atmel_asoc_wm8904_ops,
  70         SND_SOC_DAILINK_REG(pcm),
  71 };
  72
  73 static struct snd_soc_card atmel_asoc_wm8904_card = {
  74         .name = "atmel_asoc_wm8904",
  75         .owner = THIS_MODULE,
  76         .dai_link = &atmel_asoc_wm8904_dailink,
  77         .num_links = 1,
  78         .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
  79         .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
  80         .fully_routed = true,
  81 };
  82
  83 static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
  84 {
  85         struct device_node *np = pdev->dev.of_node;
  86         struct device_node *codec_np, *cpu_np;
  87         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
  88         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
  89         int ret;
  90
  91         if (!np) {
  92                 dev_err(&pdev->dev, "only device tree supported\n");
  93                 return -EINVAL;
  94         }
  95
  96         ret = snd_soc_of_parse_card_name(card, "atmel,model");
  97         if (ret) {
  98                 dev_err(&pdev->dev, "failed to parse card name\n");
  99                 return ret;
 100         }
 101
 102         ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
 103         if (ret) {
 104                 dev_err(&pdev->dev, "failed to parse audio routing\n");
 105                 return ret;
 106         }
 107
 108         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
 109         if (!cpu_np) {
 110                 dev_err(&pdev->dev, "failed to get dai and pcm info\n");
 111                 ret = -EINVAL;
 112                 return ret;
 113         }
 114         dailink->cpus->of_node = cpu_np;
 115         dailink->platforms->of_node = cpu_np;
 116         of_node_put(cpu_np);
 117
 118         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
 119         if (!codec_np) {
 120                 dev_err(&pdev->dev, "failed to get codec info\n");
 121                 ret = -EINVAL;
 122                 return ret;
 123         }
 124         dailink->codecs->of_node = codec_np;
 125         of_node_put(codec_np);
 126
 127         return 0;
 128 }
 129
 130 static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
 131 {
 132         struct snd_soc_card *card = &atmel_asoc_wm8904_card;
 133         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 134         int id, ret;
 135
 136         card->dev = &pdev->dev;
 137         ret = atmel_asoc_wm8904_dt_init(pdev);
 138         if (ret) {
 139                 dev_err(&pdev->dev, "failed to init dt info\n");
 140                 return ret;
 141         }
 142
 143         id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
 144         ret = atmel_ssc_set_audio(id);
 145         if (ret != 0) {
 146                 dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
 147                 return ret;
 148         }
 149
 150         ret = snd_soc_register_card(card);
 151         if (ret) {
 152                 dev_err(&pdev->dev, "snd_soc_register_card failed\n");
 153                 goto err_set_audio;
 154         }
 155
 156         return 0;
 157
 158 err_set_audio:
 159         atmel_ssc_put_audio(id);
 160         return ret;
 161 }
 162
 163 static void atmel_asoc_wm8904_remove(struct platform_device *pdev)
 164 {
 165         struct snd_soc_card *card = platform_get_drvdata(pdev);
 166         struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
 167         int id;
 168
 169         id = of_alias_get_id((struct device_node *)dailink->cpus->of_node, "ssc");
 170
 171         snd_soc_unregister_card(card);
 172         atmel_ssc_put_audio(id);
 173 }
 174
 175 #ifdef CONFIG_OF
 176 static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
 177         { .compatible = "atmel,asoc-wm8904", },
 178         { }
 179 };
 180 MODULE_DEVICE_TABLE(of, atmel_asoc_wm8904_dt_ids);
 181 #endif
 182
 183 static struct platform_driver atmel_asoc_wm8904_driver = {
 184         .driver = {
 185                 .name = "atmel-wm8904-audio",
 186                 .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
 187                 .pm             = &snd_soc_pm_ops,
 188         },
 189         .probe = atmel_asoc_wm8904_probe,
 190         .remove = atmel_asoc_wm8904_remove,
 191 };
 192
 193 module_platform_driver(atmel_asoc_wm8904_driver);
 194
 195 /* Module information */
 196 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
 197 MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
 198 MODULE_LICENSE("GPL");