sound/soc/codecs/wm8524.c

   1 /*
   2  * wm8524.c  --  WM8524 ALSA SoC Audio driver
   3  *
   4  * Copyright 2009 Wolfson Microelectronics plc
   5  * Copyright 2017 NXP
   6  *
   7  * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/gpio/consumer.h>
  20 #include <linux/of_device.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/initval.h>
  26
  27 #define WM8524_NUM_RATES 7
  28
  29 /* codec private data */
  30 struct wm8524_priv {
  31         struct gpio_desc *mute;
  32         unsigned int sysclk;
  33         unsigned int rate_constraint_list[WM8524_NUM_RATES];
  34         struct snd_pcm_hw_constraint_list rate_constraint;
  35 };
  36
  37
  38 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
  39 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
  40 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
  41 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
  42 };
  43
  44 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
  45         { "LINEVOUTL", NULL, "DAC" },
  46         { "LINEVOUTR", NULL, "DAC" },
  47 };
  48
  49 static const struct {
  50         int value;
  51         int ratio;
  52 } lrclk_ratios[WM8524_NUM_RATES] = {
  53         { 1, 128 },
  54         { 2, 192 },
  55         { 3, 256 },
  56         { 4, 384 },
  57         { 5, 512 },
  58         { 6, 768 },
  59         { 7, 1152 },
  60 };
  61
  62 static int wm8524_startup(struct snd_pcm_substream *substream,
  63                           struct snd_soc_dai *dai)
  64 {
  65         struct snd_soc_codec *codec = dai->codec;
  66         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
  67
  68         /* The set of sample rates that can be supported depends on the
  69          * MCLK supplied to the CODEC - enforce this.
  70          */
  71         if (!wm8524->sysclk) {
  72                 dev_err(codec->dev,
  73                         "No MCLK configured, call set_sysclk() on init\n");
  74                 return -EINVAL;
  75         }
  76
  77         snd_pcm_hw_constraint_list(substream->runtime, 0,
  78                                    SNDRV_PCM_HW_PARAM_RATE,
  79                                    &wm8524->rate_constraint);
  80
  81         gpiod_set_value_cansleep(wm8524->mute, 1);
  82
  83         return 0;
  84 }
  85
  86 static void wm8524_shutdown(struct snd_pcm_substream *substream,
  87                           struct snd_soc_dai *dai)
  88 {
  89         struct snd_soc_codec *codec = dai->codec;
  90         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
  91
  92         gpiod_set_value_cansleep(wm8524->mute, 0);
  93 }
  94
  95 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
  96                 int clk_id, unsigned int freq, int dir)
  97 {
  98         struct snd_soc_codec *codec = codec_dai->codec;
  99         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
 100         unsigned int val;
 101         int i, j = 0;
 102
 103         wm8524->sysclk = freq;
 104
 105         wm8524->rate_constraint.count = 0;
 106         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 107                 val = freq / lrclk_ratios[i].ratio;
 108                 /* Check that it's a standard rate since core can't
 109                  * cope with others and having the odd rates confuses
 110                  * constraint matching.
 111                  */
 112                 switch (val) {
 113                 case 8000:
 114                 case 32000:
 115                 case 44100:
 116                 case 48000:
 117                 case 88200:
 118                 case 96000:
 119                 case 176400:
 120                 case 192000:
 121                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 122                                 val);
 123                         wm8524->rate_constraint_list[j++] = val;
 124                         wm8524->rate_constraint.count++;
 125                         break;
 126                 default:
 127                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 128                                 val);
 129                 }
 130         }
 131
 132         /* Need at least one supported rate... */
 133         if (wm8524->rate_constraint.count == 0)
 134                 return -EINVAL;
 135
 136         return 0;
 137 }
 138
 139 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 140 {
 141         fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
 142                 SND_SOC_DAIFMT_MASTER_MASK);
 143
 144         if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 145                     SND_SOC_DAIFMT_CBS_CFS)) {
 146                 dev_err(codec_dai->dev, "Invalid DAI format\n");
 147                 return -EINVAL;
 148         }
 149
 150         return 0;
 151 }
 152
 153 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 154 {
 155         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(dai->codec);
 156
 157         if (wm8524->mute)
 158                 gpiod_set_value_cansleep(wm8524->mute, mute);
 159
 160         return 0;
 161 }
 162
 163 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000
 164
 165 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
 166
 167 static const struct snd_soc_dai_ops wm8524_dai_ops = {
 168         .startup        = wm8524_startup,
 169         .shutdown       = wm8524_shutdown,
 170         .set_sysclk     = wm8524_set_dai_sysclk,
 171         .set_fmt        = wm8524_set_fmt,
 172         .mute_stream    = wm8524_mute_stream,
 173 };
 174
 175 static struct snd_soc_dai_driver wm8524_dai = {
 176         .name = "wm8524-hifi",
 177         .playback = {
 178                 .stream_name = "Playback",
 179                 .channels_min = 2,
 180                 .channels_max = 2,
 181                 .rates = WM8524_RATES,
 182                 .formats = WM8524_FORMATS,
 183         },
 184         .ops = &wm8524_dai_ops,
 185 };
 186
 187 static int wm8524_probe(struct snd_soc_codec *codec)
 188 {
 189         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
 190
 191         wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
 192         wm8524->rate_constraint.count =
 193                 ARRAY_SIZE(wm8524->rate_constraint_list);
 194
 195         return 0;
 196 }
 197
 198 static const struct snd_soc_codec_driver soc_codec_dev_wm8524 = {
 199         .probe =        wm8524_probe,
 200
 201         .component_driver = {
 202                 .dapm_widgets           = wm8524_dapm_widgets,
 203                 .num_dapm_widgets       = ARRAY_SIZE(wm8524_dapm_widgets),
 204                 .dapm_routes            = wm8524_dapm_routes,
 205                 .num_dapm_routes        = ARRAY_SIZE(wm8524_dapm_routes),
 206         },
 207 };
 208
 209 static const struct of_device_id wm8524_of_match[] = {
 210         { .compatible = "wlf,wm8524" },
 211         { /* sentinel*/ }
 212 };
 213 MODULE_DEVICE_TABLE(of, wm8524_of_match);
 214
 215 static int wm8524_codec_probe(struct platform_device *pdev)
 216 {
 217         struct wm8524_priv *wm8524;
 218         int ret;
 219
 220         wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
 221                                                   GFP_KERNEL);
 222         if (wm8524 == NULL)
 223                 return -ENOMEM;
 224
 225         platform_set_drvdata(pdev, wm8524);
 226
 227         wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
 228         if (IS_ERR(wm8524->mute)) {
 229                 ret = PTR_ERR(wm8524->mute);
 230                 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
 231                 return ret;
 232         }
 233
 234         ret =  snd_soc_register_codec(&pdev->dev,
 235                         &soc_codec_dev_wm8524, &wm8524_dai, 1);
 236         if (ret < 0)
 237                 dev_err(&pdev->dev, "Failed to register codec: %d\n", ret);
 238
 239         return ret;
 240 }
 241
 242 static int wm8524_codec_remove(struct platform_device *pdev)
 243 {
 244         snd_soc_unregister_codec(&pdev->dev);
 245         return 0;
 246 }
 247
 248 static struct platform_driver wm8524_codec_driver = {
 249         .probe          = wm8524_codec_probe,
 250         .remove         = wm8524_codec_remove,
 251         .driver         = {
 252                 .name   = "wm8524-codec",
 253                 .of_match_table = wm8524_of_match,
 254         },
 255 };
 256 module_platform_driver(wm8524_codec_driver);
 257
 258 MODULE_DESCRIPTION("ASoC WM8524 driver");
 259 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
 260 MODULE_ALIAS("platform:wm8524-codec");
 261 MODULE_LICENSE("GPL");