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Mihai Serbanbroonie
Mihai Serban
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broonie
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ASoC: codecs: add wm8524 codec driver
WM8524 is a 24-bit 192KHz stereo digital/analog converter (DAC) with integral charge pump and a simple hardware control interface. Product information can be found at: https://www.cirrus.com/products/wm8524/ Signed-off-by: Mihai Serban <[email protected]> Signed-off-by: Shengjiu Wang <[email protected]> Signed-off-by: Mark Brown <[email protected]>
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‎Documentation/devicetree/bindings/sound/wm8524.txt

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WM8524 audio CODEC
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This device does not use I2C or SPI but a simple Hardware Control Interface.
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Required properties:
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- compatible : "wlf,wm8524"
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- wlf,mute-gpios: a GPIO spec for the MUTE pin.
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Example:
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codec: wm8524@0 {
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compatible = "wlf,wm8524";
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wlf,mute-gpios = <&gpio1 8 GPIO_ACTIVE_LOW>;
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};

‎sound/soc/codecs/Kconfig

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@@ -173,6 +173,7 @@ config SND_SOC_ALL_CODECS
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select SND_SOC_WM8400 if MFD_WM8400
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select SND_SOC_WM8510 if SND_SOC_I2C_AND_SPI
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select SND_SOC_WM8523 if I2C
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select SND_SOC_WM8524 if GPIOLIB
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select SND_SOC_WM8580 if I2C
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select SND_SOC_WM8711 if SND_SOC_I2C_AND_SPI
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select SND_SOC_WM8727
@@ -967,6 +968,10 @@ config SND_SOC_WM8523
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tristate "Wolfson Microelectronics WM8523 DAC"
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depends on I2C
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config SND_SOC_WM8524
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tristate "Wolfson Microelectronics WM8524 DAC"
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depends on GPIOLIB
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config SND_SOC_WM8580
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tristate "Wolfson Microelectronics WM8580 and WM8581 CODECs"
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depends on I2C

‎sound/soc/codecs/Makefile

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@@ -182,6 +182,7 @@ snd-soc-wm8350-objs := wm8350.o
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snd-soc-wm8400-objs := wm8400.o
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snd-soc-wm8510-objs := wm8510.o
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snd-soc-wm8523-objs := wm8523.o
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snd-soc-wm8524-objs := wm8524.o
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snd-soc-wm8580-objs := wm8580.o
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snd-soc-wm8711-objs := wm8711.o
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snd-soc-wm8727-objs := wm8727.o
@@ -414,6 +415,7 @@ obj-$(CONFIG_SND_SOC_WM8350) += snd-soc-wm8350.o
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obj-$(CONFIG_SND_SOC_WM8400) += snd-soc-wm8400.o
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obj-$(CONFIG_SND_SOC_WM8510) += snd-soc-wm8510.o
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obj-$(CONFIG_SND_SOC_WM8523) += snd-soc-wm8523.o
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obj-$(CONFIG_SND_SOC_WM8524) += snd-soc-wm8524.o
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obj-$(CONFIG_SND_SOC_WM8580) += snd-soc-wm8580.o
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obj-$(CONFIG_SND_SOC_WM8711) += snd-soc-wm8711.o
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obj-$(CONFIG_SND_SOC_WM8727) += snd-soc-wm8727.o

‎sound/soc/codecs/wm8524.c

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/*
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* wm8524.c -- WM8524 ALSA SoC Audio driver
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*
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* Copyright 2009 Wolfson Microelectronics plc
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* Copyright 2017 NXP
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*
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* Based on WM8523 ALSA SoC Audio driver written by Mark Brown
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/initval.h>
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#define WM8524_NUM_RATES 7
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/* codec private data */
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struct wm8524_priv {
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struct gpio_desc *mute;
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unsigned int sysclk;
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unsigned int rate_constraint_list[WM8524_NUM_RATES];
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struct snd_pcm_hw_constraint_list rate_constraint;
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};
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static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
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SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
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SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
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};
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static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
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{ "LINEVOUTL", NULL, "DAC" },
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{ "LINEVOUTR", NULL, "DAC" },
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};
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static const struct {
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int value;
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int ratio;
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} lrclk_ratios[WM8524_NUM_RATES] = {
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{ 1, 128 },
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{ 2, 192 },
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{ 3, 256 },
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{ 4, 384 },
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{ 5, 512 },
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{ 6, 768 },
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{ 7, 1152 },
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};
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static int wm8524_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_codec *codec = dai->codec;
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struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
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/* The set of sample rates that can be supported depends on the
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* MCLK supplied to the CODEC - enforce this.
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*/
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if (!wm8524->sysclk) {
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dev_err(codec->dev,
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"No MCLK configured, call set_sysclk() on init\n");
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return -EINVAL;
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}
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snd_pcm_hw_constraint_list(substream->runtime, 0,
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SNDRV_PCM_HW_PARAM_RATE,
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&wm8524->rate_constraint);
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gpiod_set_value_cansleep(wm8524->mute, 1);
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return 0;
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}
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static void wm8524_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_codec *codec = dai->codec;
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struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
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gpiod_set_value_cansleep(wm8524->mute, 0);
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}
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static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
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int clk_id, unsigned int freq, int dir)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
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unsigned int val;
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int i, j = 0;
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wm8524->sysclk = freq;
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wm8524->rate_constraint.count = 0;
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for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
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val = freq / lrclk_ratios[i].ratio;
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/* Check that it's a standard rate since core can't
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* cope with others and having the odd rates confuses
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* constraint matching.
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*/
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switch (val) {
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case 8000:
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case 32000:
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case 44100:
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case 48000:
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case 88200:
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case 96000:
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case 176400:
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case 192000:
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dev_err(codec->dev, "Supported sample rate: %dHz\n",
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val);
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wm8524->rate_constraint_list[j++] = val;
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wm8524->rate_constraint.count++;
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break;
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default:
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dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
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val);
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}
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}
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/* Need at least one supported rate... */
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if (wm8524->rate_constraint.count == 0)
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return -EINVAL;
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return 0;
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}
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static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
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{
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fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
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SND_SOC_DAIFMT_MASTER_MASK);
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if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBS_CFS)) {
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dev_err(codec_dai->dev, "Invalid DAI format\n");
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return -EINVAL;
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}
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return 0;
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}
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static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
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{
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struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(dai->codec);
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if (wm8524->mute)
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gpiod_set_value_cansleep(wm8524->mute, mute);
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return 0;
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}
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#define WM8524_RATES SNDRV_PCM_RATE_8000_192000
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#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
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static const struct snd_soc_dai_ops wm8524_dai_ops = {
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.startup = wm8524_startup,
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.shutdown = wm8524_shutdown,
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.set_sysclk = wm8524_set_dai_sysclk,
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.set_fmt = wm8524_set_fmt,
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.mute_stream = wm8524_mute_stream,
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};
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static struct snd_soc_dai_driver wm8524_dai = {
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.name = "wm8524-hifi",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 2,
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.channels_max = 2,
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.rates = WM8524_RATES,
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.formats = WM8524_FORMATS,
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},
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.ops = &wm8524_dai_ops,
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};
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static int wm8524_probe(struct snd_soc_codec *codec)
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{
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struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
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wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
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wm8524->rate_constraint.count =
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ARRAY_SIZE(wm8524->rate_constraint_list);
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return 0;
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}
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static const struct snd_soc_codec_driver soc_codec_dev_wm8524 = {
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.probe = wm8524_probe,
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.component_driver = {
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.dapm_widgets = wm8524_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets),
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.dapm_routes = wm8524_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes),
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},
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};
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#ifdef CONFIG_OF
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static const struct of_device_id wm8524_of_match[] = {
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{ .compatible = "wlf,wm8524" },
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{ /* sentinel*/ }
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};
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MODULE_DEVICE_TABLE(of, wm8524_of_match);
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#endif
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static int wm8524_codec_probe(struct platform_device *pdev)
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{
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struct wm8524_priv *wm8524;
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int ret;
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wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
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GFP_KERNEL);
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if (wm8524 == NULL)
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return -ENOMEM;
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platform_set_drvdata(pdev, wm8524);
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wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
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if (IS_ERR(wm8524->mute)) {
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ret = PTR_ERR(wm8524->mute);
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dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
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return ret;
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}
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ret = snd_soc_register_codec(&pdev->dev,
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&soc_codec_dev_wm8524, &wm8524_dai, 1);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register codec: %d\n", ret);
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snd_soc_unregister_platform(&pdev->dev);
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}
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return ret;
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}
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static int wm8524_codec_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_codec(&pdev->dev);
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return 0;
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}
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static struct platform_driver wm8524_codec_driver = {
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.probe = wm8524_codec_probe,
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.remove = wm8524_codec_remove,
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.driver = {
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.name = "wm8524-codec",
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.of_match_table = wm8524_of_match,
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},
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};
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module_platform_driver(wm8524_codec_driver);
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MODULE_DESCRIPTION("ASoC WM8524 driver");
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MODULE_AUTHOR("Mihai Serban <[email protected]>");
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MODULE_ALIAS("platform:wm8524-codec");
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MODULE_LICENSE("GPL");

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