linux/sound/soc/codecs/wm8524.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * wm8524.c  --  WM8524 ALSA SoC Audio driver
   4 *
   5 * Copyright 2009 Wolfson Microelectronics plc
   6 * Copyright 2017 NXP
   7 *
   8 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/moduleparam.h>
  13#include <linux/init.h>
  14#include <linux/delay.h>
  15#include <linux/slab.h>
  16#include <linux/gpio/consumer.h>
  17#include <linux/of_device.h>
  18#include <sound/core.h>
  19#include <sound/pcm.h>
  20#include <sound/pcm_params.h>
  21#include <sound/soc.h>
  22#include <sound/initval.h>
  23
  24#define WM8524_NUM_RATES 7
  25
  26/* codec private data */
  27struct wm8524_priv {
  28        struct gpio_desc *mute;
  29        unsigned int sysclk;
  30        unsigned int rate_constraint_list[WM8524_NUM_RATES];
  31        struct snd_pcm_hw_constraint_list rate_constraint;
  32};
  33
  34
  35static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
  36SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
  37SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
  38SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
  39};
  40
  41static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
  42        { "LINEVOUTL", NULL, "DAC" },
  43        { "LINEVOUTR", NULL, "DAC" },
  44};
  45
  46static const struct {
  47        int value;
  48        int ratio;
  49} lrclk_ratios[WM8524_NUM_RATES] = {
  50        { 1, 128 },
  51        { 2, 192 },
  52        { 3, 256 },
  53        { 4, 384 },
  54        { 5, 512 },
  55        { 6, 768 },
  56        { 7, 1152 },
  57};
  58
  59static int wm8524_startup(struct snd_pcm_substream *substream,
  60                          struct snd_soc_dai *dai)
  61{
  62        struct snd_soc_component *component = dai->component;
  63        struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
  64
  65        /* The set of sample rates that can be supported depends on the
  66         * MCLK supplied to the CODEC - enforce this.
  67         */
  68        if (!wm8524->sysclk) {
  69                dev_err(component->dev,
  70                        "No MCLK configured, call set_sysclk() on init\n");
  71                return -EINVAL;
  72        }
  73
  74        snd_pcm_hw_constraint_list(substream->runtime, 0,
  75                                   SNDRV_PCM_HW_PARAM_RATE,
  76                                   &wm8524->rate_constraint);
  77
  78        gpiod_set_value_cansleep(wm8524->mute, 1);
  79
  80        return 0;
  81}
  82
  83static void wm8524_shutdown(struct snd_pcm_substream *substream,
  84                          struct snd_soc_dai *dai)
  85{
  86        struct snd_soc_component *component = dai->component;
  87        struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
  88
  89        gpiod_set_value_cansleep(wm8524->mute, 0);
  90}
  91
  92static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
  93                int clk_id, unsigned int freq, int dir)
  94{
  95        struct snd_soc_component *component = codec_dai->component;
  96        struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
  97        unsigned int val;
  98        int i, j = 0;
  99
 100        wm8524->sysclk = freq;
 101
 102        wm8524->rate_constraint.count = 0;
 103        for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 104                val = freq / lrclk_ratios[i].ratio;
 105                /* Check that it's a standard rate since core can't
 106                 * cope with others and having the odd rates confuses
 107                 * constraint matching.
 108                 */
 109                switch (val) {
 110                case 8000:
 111                case 32000:
 112                case 44100:
 113                case 48000:
 114                case 88200:
 115                case 96000:
 116                case 176400:
 117                case 192000:
 118                        dev_dbg(component->dev, "Supported sample rate: %dHz\n",
 119                                val);
 120                        wm8524->rate_constraint_list[j++] = val;
 121                        wm8524->rate_constraint.count++;
 122                        break;
 123                default:
 124                        dev_dbg(component->dev, "Skipping sample rate: %dHz\n",
 125                                val);
 126                }
 127        }
 128
 129        /* Need at least one supported rate... */
 130        if (wm8524->rate_constraint.count == 0)
 131                return -EINVAL;
 132
 133        return 0;
 134}
 135
 136static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 137{
 138        fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
 139                SND_SOC_DAIFMT_MASTER_MASK);
 140
 141        if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 142                    SND_SOC_DAIFMT_CBS_CFS)) {
 143                dev_err(codec_dai->dev, "Invalid DAI format\n");
 144                return -EINVAL;
 145        }
 146
 147        return 0;
 148}
 149
 150static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 151{
 152        struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component);
 153
 154        if (wm8524->mute)
 155                gpiod_set_value_cansleep(wm8524->mute, mute);
 156
 157        return 0;
 158}
 159
 160#define WM8524_RATES SNDRV_PCM_RATE_8000_192000
 161
 162#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
 163                        SNDRV_PCM_FMTBIT_S24_LE |\
 164                        SNDRV_PCM_FMTBIT_S32_LE)
 165
 166static const struct snd_soc_dai_ops wm8524_dai_ops = {
 167        .startup        = wm8524_startup,
 168        .shutdown       = wm8524_shutdown,
 169        .set_sysclk     = wm8524_set_dai_sysclk,
 170        .set_fmt        = wm8524_set_fmt,
 171        .mute_stream    = wm8524_mute_stream,
 172};
 173
 174static struct snd_soc_dai_driver wm8524_dai = {
 175        .name = "wm8524-hifi",
 176        .playback = {
 177                .stream_name = "Playback",
 178                .channels_min = 2,
 179                .channels_max = 2,
 180                .rates = WM8524_RATES,
 181                .formats = WM8524_FORMATS,
 182        },
 183        .ops = &wm8524_dai_ops,
 184};
 185
 186static int wm8524_probe(struct snd_soc_component *component)
 187{
 188        struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
 189
 190        wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
 191        wm8524->rate_constraint.count =
 192                ARRAY_SIZE(wm8524->rate_constraint_list);
 193
 194        return 0;
 195}
 196
 197static const struct snd_soc_component_driver soc_component_dev_wm8524 = {
 198        .probe                  = wm8524_probe,
 199        .dapm_widgets           = wm8524_dapm_widgets,
 200        .num_dapm_widgets       = ARRAY_SIZE(wm8524_dapm_widgets),
 201        .dapm_routes            = wm8524_dapm_routes,
 202        .num_dapm_routes        = ARRAY_SIZE(wm8524_dapm_routes),
 203        .idle_bias_on           = 1,
 204        .use_pmdown_time        = 1,
 205        .endianness             = 1,
 206        .non_legacy_dai_naming  = 1,
 207};
 208
 209static const struct of_device_id wm8524_of_match[] = {
 210        { .compatible = "wlf,wm8524" },
 211        { /* sentinel*/ }
 212};
 213MODULE_DEVICE_TABLE(of, wm8524_of_match);
 214
 215static 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 = devm_snd_soc_register_component(&pdev->dev,
 235                        &soc_component_dev_wm8524, &wm8524_dai, 1);
 236        if (ret < 0)
 237                dev_err(&pdev->dev, "Failed to register component: %d\n", ret);
 238
 239        return ret;
 240}
 241
 242static struct platform_driver wm8524_codec_driver = {
 243        .probe          = wm8524_codec_probe,
 244        .driver         = {
 245                .name   = "wm8524-codec",
 246                .of_match_table = wm8524_of_match,
 247        },
 248};
 249module_platform_driver(wm8524_codec_driver);
 250
 251MODULE_DESCRIPTION("ASoC WM8524 driver");
 252MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
 253MODULE_ALIAS("platform:wm8524-codec");
 254MODULE_LICENSE("GPL");
 255