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ARM: adau1977-adc: Add basic machine driver for adau1977 codec driver.
This commit adds basic support for the codec usage including: Device tree overlay, binding I2S bus and setting I2S mode, clock source and frequency setting according to spec. Signed-off-by: Andrey Grodzovsky <[email protected]>
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‎arch/arm/boot/dts/overlays/Makefile

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@@ -12,6 +12,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y)
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RPI_DT_OVERLAYS=y
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endif
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dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo

‎arch/arm/boot/dts/overlays/README

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@@ -161,6 +161,13 @@ Params:
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and the other i2c baudrate parameters.
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Name: adau1977-adc
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Info: Overlay for activation of ADAU1977 ADC codec over I2C for control
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and I2S for data.
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Load: dtoverlay=adau1977-adc
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Params: <None>
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Name: ads7846
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Info: ADS7846 Touch controller
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Load: dtoverlay=ads7846,<param>=<val>

‎arch/arm/boot/dts/overlays/adau1977-adc-overlay.dts

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// Definitions for ADAU1977 ADC
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2708";
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fragment@0 {
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target = <&soc>;
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__overlay__ {
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codec_supply: fixedregulator@0 {
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compatible = "regulator-fixed";
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regulator-name = "AVDD";
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regulator-min-microvolt = <3300000>;
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regulator-max-microvolt = <3300000>;
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};
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};
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};
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fragment@1 {
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target = <&i2c>;
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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status = "okay";
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adau1977: codec@11 {
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compatible = "adi,adau1977";
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reg = <0x11>;
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reset-gpios = <&gpio 5 0>;
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AVDD-supply = <&codec_supply>;
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};
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};
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};
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fragment@2 {
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target = <&i2s>;
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__overlay__ {
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status = "okay";
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};
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};
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fragment@3 {
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target = <&sound>;
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__overlay__ {
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compatible = "adi,adau1977-adc";
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i2s-controller = <&i2s>;
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status = "okay";
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};
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};
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};

‎arch/arm/configs/bcm2709_defconfig

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@@ -861,6 +861,7 @@ CONFIG_SND_BCM2708_SOC_BOOMBERRY_DAC=m
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CONFIG_SND_BCM2708_SOC_BOOMBERRY_DIGI=m
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CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
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CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
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CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
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CONFIG_SND_SOC_ADAU1701=m
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CONFIG_SND_SOC_WM8804_I2C=m
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CONFIG_SND_SIMPLE_CARD=m

‎arch/arm/configs/bcmrpi_defconfig

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@@ -853,6 +853,7 @@ CONFIG_SND_BCM2708_SOC_BOOMBERRY_DAC=m
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CONFIG_SND_BCM2708_SOC_BOOMBERRY_DIGI=m
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CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
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CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
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CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
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CONFIG_SND_SOC_ADAU1701=m
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CONFIG_SND_SOC_WM8804_I2C=m
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CONFIG_SND_SIMPLE_CARD=m

‎sound/soc/bcm/Kconfig

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@@ -78,3 +78,10 @@ config SND_BCM2708_SOC_RASPIDAC3
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select SND_SOC_TPA6130A2
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help
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Say Y or M if you want to add support for RaspiDAC Rev.3x.
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config SND_BCM2708_SOC_ADAU1977_ADC
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tristate "Support for ADAU1977 ADC"
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depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
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select SND_SOC_ADAU1977_I2C
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help
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Say Y or M if you want to add support for ADAU1977 ADC.

‎sound/soc/bcm/Makefile

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@@ -4,6 +4,7 @@ snd-soc-bcm2835-i2s-objs := bcm2835-i2s.o
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obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
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# BCM2708 Machine Support
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snd-soc-adau1977-adc-objs := adau1977-adc.o
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snd-soc-hifiberry-dac-objs := hifiberry_dac.o
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snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
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snd-soc-hifiberry-digi-objs := hifiberry_digi.o
@@ -15,6 +16,7 @@ snd-soc-rpi-proto-objs := rpi-proto.o
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snd-soc-iqaudio-dac-objs := iqaudio-dac.o
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snd-soc-raspidac3-objs := raspidac3.o
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obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
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obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
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obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
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obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o

‎sound/soc/bcm/adau1977-adc.c

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/*
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* ASoC Driver for ADAU1977 ADC
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*
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* Author: Andrey Grodzovsky <[email protected]>
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* Copyright 2016
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*
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* This file is based on hifibery_dac driver by Florian Meier.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/platform_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/jack.h>
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enum adau1977_clk_id {
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ADAU1977_SYSCLK,
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};
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enum adau1977_sysclk_src {
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ADAU1977_SYSCLK_SRC_MCLK,
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ADAU1977_SYSCLK_SRC_LRCLK,
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};
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static int eval_adau1977_init(struct snd_soc_pcm_runtime *rtd)
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{
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int ret;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, 0, 0, 0);
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if (ret < 0)
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return ret;
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return snd_soc_codec_set_sysclk(rtd->codec, ADAU1977_SYSCLK,
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ADAU1977_SYSCLK_SRC_MCLK, 11289600, SND_SOC_CLOCK_IN);
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}
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static struct snd_soc_dai_link snd_rpi_adau1977_dai[] = {
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{
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.name = "adau1977",
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.stream_name = "ADAU1977",
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.cpu_dai_name = "bcm2708-i2s.0",
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.codec_dai_name = "adau1977-hifi",
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.platform_name = "bcm2708-i2s.0",
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.codec_name = "adau1977.1-0011",
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.init = eval_adau1977_init,
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.dai_fmt = SND_SOC_DAIFMT_I2S |
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SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBM_CFM,
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},
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};
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/* audio machine driver */
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static struct snd_soc_card snd_adau1977_adc = {
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.name = "snd_rpi_adau1977_adc",
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.owner = THIS_MODULE,
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.dai_link = snd_rpi_adau1977_dai,
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.num_links = ARRAY_SIZE(snd_rpi_adau1977_dai),
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};
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static int snd_adau1977_adc_probe(struct platform_device *pdev)
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{
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int ret = 0;
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snd_adau1977_adc.dev = &pdev->dev;
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dev_info(&pdev->dev,"%s:%d\n",__func__,__LINE__);
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if (pdev->dev.of_node) {
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struct device_node *i2s_node;
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struct snd_soc_dai_link *dai = &snd_rpi_adau1977_dai[0];
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i2s_node = of_parse_phandle(pdev->dev.of_node,
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"i2s-controller", 0);
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if (i2s_node) {
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dai->cpu_dai_name = NULL;
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dai->cpu_of_node = i2s_node;
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dai->platform_name = NULL;
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dai->platform_of_node = i2s_node;
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}
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}
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ret = snd_soc_register_card(&snd_adau1977_adc);
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dev_info(&pdev->dev,"%s:%d\n",__func__,__LINE__);
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if (ret)
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dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
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return ret;
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}
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static int snd_adau1977_adc_remove(struct platform_device *pdev)
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{
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return snd_soc_unregister_card(&snd_adau1977_adc);
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}
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static const struct of_device_id snd_adau1977_adc_of_match[] = {
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{ .compatible = "adi,adau1977-adc", },
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{},
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};
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MODULE_DEVICE_TABLE(of, snd_adau1977_adc_of_match);
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static struct platform_driver snd_adau1977_adc_driver = {
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.driver = {
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.name = "snd-adau1977-adc",
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.owner = THIS_MODULE,
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.of_match_table = snd_adau1977_adc_of_match,
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},
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.probe = snd_adau1977_adc_probe,
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.remove = snd_adau1977_adc_remove,
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};
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module_platform_driver(snd_adau1977_adc_driver);
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MODULE_AUTHOR("Andrey Grodzovsky <[email protected]>");
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MODULE_DESCRIPTION("ASoC Driver for ADAU1977 ADC");
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MODULE_LICENSE("GPL v2");

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