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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * wm8524.c -- WM8524 ALSA SoC Audio driver4 *5 * Copyright 2009 Wolfson Microelectronics plc6 * Copyright 2017 NXP7 *8 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown9 */10 11#include <linux/mod_devicetable.h>12#include <linux/module.h>13#include <linux/moduleparam.h>14#include <linux/init.h>15#include <linux/delay.h>16#include <linux/slab.h>17#include <linux/gpio/consumer.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 725 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 the66 * 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't106 * cope with others and having the odd rates confuses107 * 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_192000161 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};207 208static const struct of_device_id wm8524_of_match[] = {209 { .compatible = "wlf,wm8524" },210 { /* sentinel*/ }211};212MODULE_DEVICE_TABLE(of, wm8524_of_match);213 214static int wm8524_codec_probe(struct platform_device *pdev)215{216 struct wm8524_priv *wm8524;217 int ret;218 219 wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),220 GFP_KERNEL);221 if (wm8524 == NULL)222 return -ENOMEM;223 224 platform_set_drvdata(pdev, wm8524);225 226 wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);227 if (IS_ERR(wm8524->mute)) {228 ret = PTR_ERR(wm8524->mute);229 dev_err_probe(&pdev->dev, ret, "Failed to get mute line\n");230 return ret;231 }232 233 ret = devm_snd_soc_register_component(&pdev->dev,234 &soc_component_dev_wm8524, &wm8524_dai, 1);235 if (ret < 0)236 dev_err(&pdev->dev, "Failed to register component: %d\n", ret);237 238 return ret;239}240 241static struct platform_driver wm8524_codec_driver = {242 .probe = wm8524_codec_probe,243 .driver = {244 .name = "wm8524-codec",245 .of_match_table = wm8524_of_match,246 },247};248module_platform_driver(wm8524_codec_driver);249 250MODULE_DESCRIPTION("ASoC WM8524 driver");251MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");252MODULE_ALIAS("platform:wm8524-codec");253MODULE_LICENSE("GPL");254