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 mihai.serban@nxp.com Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com --- Documentation/devicetree/bindings/sound/wm8524.txt | 16 ++ sound/soc/codecs/Kconfig | 5 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/wm8524.c | 265 +++++++++++++++++++++ 4 files changed, 288 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/wm8524.txt create mode 100644 sound/soc/codecs/wm8524.c
diff --git a/Documentation/devicetree/bindings/sound/wm8524.txt b/Documentation/devicetree/bindings/sound/wm8524.txt new file mode 100644 index 0000000..20c6200 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/wm8524.txt @@ -0,0 +1,16 @@ +WM8524 audio CODEC + +This device does not use I2C or SPI but a simple Hardware Control Interface. + +Required properties: + + - compatible : "wlf,wm8524" + + - wlf,mute-gpios: a GPIO spec for the MUTE pin. + +Example: + +codec: wm8524@0 { + compatible = "wlf,wm8524"; + wlf,mute-gpios = <&gpio1 8 GPIO_ACTIVE_LOW>; +}; diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 024ddc9..010811e 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -174,6 +174,7 @@ config SND_SOC_ALL_CODECS select SND_SOC_WM8400 if MFD_WM8400 select SND_SOC_WM8510 if SND_SOC_I2C_AND_SPI select SND_SOC_WM8523 if I2C + select SND_SOC_WM8524 if GPIOLIB select SND_SOC_WM8580 if I2C select SND_SOC_WM8711 if SND_SOC_I2C_AND_SPI select SND_SOC_WM8727 @@ -974,6 +975,10 @@ config SND_SOC_WM8523 tristate "Wolfson Microelectronics WM8523 DAC" depends on I2C
+config SND_SOC_WM8524 + tristate "Wolfson Microelectronics WM8524 DAC" + depends on GPIOLIB + config SND_SOC_WM8580 tristate "Wolfson Microelectronics WM8580 and WM8581 CODECs" depends on I2C diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index a8a4b07..12dc2f7 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -183,6 +183,7 @@ snd-soc-wm8350-objs := wm8350.o snd-soc-wm8400-objs := wm8400.o snd-soc-wm8510-objs := wm8510.o snd-soc-wm8523-objs := wm8523.o +snd-soc-wm8524-objs := wm8524.o snd-soc-wm8580-objs := wm8580.o snd-soc-wm8711-objs := wm8711.o snd-soc-wm8727-objs := wm8727.o @@ -416,6 +417,7 @@ obj-$(CONFIG_SND_SOC_WM8350) += snd-soc-wm8350.o obj-$(CONFIG_SND_SOC_WM8400) += snd-soc-wm8400.o obj-$(CONFIG_SND_SOC_WM8510) += snd-soc-wm8510.o obj-$(CONFIG_SND_SOC_WM8523) += snd-soc-wm8523.o +obj-$(CONFIG_SND_SOC_WM8524) += snd-soc-wm8524.o obj-$(CONFIG_SND_SOC_WM8580) += snd-soc-wm8580.o obj-$(CONFIG_SND_SOC_WM8711) += snd-soc-wm8711.o obj-$(CONFIG_SND_SOC_WM8727) += snd-soc-wm8727.o diff --git a/sound/soc/codecs/wm8524.c b/sound/soc/codecs/wm8524.c new file mode 100644 index 0000000..f42ec66 --- /dev/null +++ b/sound/soc/codecs/wm8524.c @@ -0,0 +1,265 @@ +/* + * wm8524.c -- WM8524 ALSA SoC Audio driver + * + * Copyright 2009 Wolfson Microelectronics plc + * Copyright 2017 NXP + * + * Based on WM8523 ALSA SoC Audio driver written by Mark Brown + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/gpio/consumer.h> +#include <linux/of_device.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/initval.h> + +#define WM8524_NUM_RATES 7 + +/* codec private data */ +struct wm8524_priv { + struct gpio_desc *mute; + unsigned int sysclk; + unsigned int rate_constraint_list[WM8524_NUM_RATES]; + struct snd_pcm_hw_constraint_list rate_constraint; +}; + + +static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = { +SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0), +SND_SOC_DAPM_OUTPUT("LINEVOUTL"), +SND_SOC_DAPM_OUTPUT("LINEVOUTR"), +}; + +static const struct snd_soc_dapm_route wm8524_dapm_routes[] = { + { "LINEVOUTL", NULL, "DAC" }, + { "LINEVOUTR", NULL, "DAC" }, +}; + +static const struct { + int value; + int ratio; +} lrclk_ratios[WM8524_NUM_RATES] = { + { 1, 128 }, + { 2, 192 }, + { 3, 256 }, + { 4, 384 }, + { 5, 512 }, + { 6, 768 }, + { 7, 1152 }, +}; + +static int wm8524_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_codec *codec = dai->codec; + struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec); + + /* The set of sample rates that can be supported depends on the + * MCLK supplied to the CODEC - enforce this. + */ + if (!wm8524->sysclk) { + dev_err(codec->dev, + "No MCLK configured, call set_sysclk() on init\n"); + return -EINVAL; + } + + snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + &wm8524->rate_constraint); + + gpiod_set_value_cansleep(wm8524->mute, 1); + + return 0; +} + +static void wm8524_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_codec *codec = dai->codec; + struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec); + + gpiod_set_value_cansleep(wm8524->mute, 0); +} + +static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai, + int clk_id, unsigned int freq, int dir) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec); + unsigned int val; + int i, j = 0; + + wm8524->sysclk = freq; + + wm8524->rate_constraint.count = 0; + for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { + val = freq / lrclk_ratios[i].ratio; + /* Check that it's a standard rate since core can't + * cope with others and having the odd rates confuses + * constraint matching. + */ + switch (val) { + case 8000: + case 32000: + case 44100: + case 48000: + case 88200: + case 96000: + case 176400: + case 192000: + dev_err(codec->dev, "Supported sample rate: %dHz\n", + val); + wm8524->rate_constraint_list[j++] = val; + wm8524->rate_constraint.count++; + break; + default: + dev_dbg(codec->dev, "Skipping sample rate: %dHz\n", + val); + } + } + + /* Need at least one supported rate... */ + if (wm8524->rate_constraint.count == 0) + return -EINVAL; + + return 0; +} + +static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) +{ + fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK | + SND_SOC_DAIFMT_MASTER_MASK); + + if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS)) { + dev_err(codec_dai->dev, "Invalid DAI format\n"); + return -EINVAL; + } + + return 0; +} + +static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream) +{ + struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(dai->codec); + + if (wm8524->mute) + gpiod_set_value_cansleep(wm8524->mute, mute); + + return 0; +} + +#define WM8524_RATES SNDRV_PCM_RATE_8000_192000 + +#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) + +static const struct snd_soc_dai_ops wm8524_dai_ops = { + .startup = wm8524_startup, + .shutdown = wm8524_shutdown, + .set_sysclk = wm8524_set_dai_sysclk, + .set_fmt = wm8524_set_fmt, + .mute_stream = wm8524_mute_stream, +}; + +static struct snd_soc_dai_driver wm8524_dai = { + .name = "wm8524-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = WM8524_RATES, + .formats = WM8524_FORMATS, + }, + .ops = &wm8524_dai_ops, +}; + +static int wm8524_probe(struct snd_soc_codec *codec) +{ + struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec); + + wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0]; + wm8524->rate_constraint.count = + ARRAY_SIZE(wm8524->rate_constraint_list); + + return 0; +} + +static const struct snd_soc_codec_driver soc_codec_dev_wm8524 = { + .probe = wm8524_probe, + + .component_driver = { + .dapm_widgets = wm8524_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(wm8524_dapm_widgets), + .dapm_routes = wm8524_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(wm8524_dapm_routes), + }, +}; + +#ifdef CONFIG_OF +static const struct of_device_id wm8524_of_match[] = { + { .compatible = "wlf,wm8524" }, + { /* sentinel*/ } +}; +MODULE_DEVICE_TABLE(of, wm8524_of_match); +#endif + +static int wm8524_codec_probe(struct platform_device *pdev) +{ + struct wm8524_priv *wm8524; + int ret; + + wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv), + GFP_KERNEL); + if (wm8524 == NULL) + return -ENOMEM; + + platform_set_drvdata(pdev, wm8524); + + wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW); + if (IS_ERR(wm8524->mute)) { + ret = PTR_ERR(wm8524->mute); + dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret); + return ret; + } + + ret = snd_soc_register_codec(&pdev->dev, + &soc_codec_dev_wm8524, &wm8524_dai, 1); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register codec: %d\n", ret); + snd_soc_unregister_platform(&pdev->dev); + } + + return ret; +} + +static int wm8524_codec_remove(struct platform_device *pdev) +{ + snd_soc_unregister_codec(&pdev->dev); + return 0; +} + +static struct platform_driver wm8524_codec_driver = { + .probe = wm8524_codec_probe, + .remove = wm8524_codec_remove, + .driver = { + .name = "wm8524-codec", + .of_match_table = wm8524_of_match, + }, +}; +module_platform_driver(wm8524_codec_driver); + +MODULE_DESCRIPTION("ASoC WM8524 driver"); +MODULE_AUTHOR("Mihai Serban mihai.serban@nxp.com"); +MODULE_ALIAS("platform:wm8524-codec"); +MODULE_LICENSE("GPL");