From bec2ad610c71adc8c26598fb27259d7d7348d4c3 Mon Sep 17 00:00:00 2001
From: Andrey Grodzovsky <andrey2805@gmail.com>
Date: Tue, 3 May 2016 22:10:59 -0400
Subject: [PATCH] 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 <andrey2805@gmail.com>
---
 arch/arm/boot/dts/overlays/Makefile                |   1 +
 arch/arm/boot/dts/overlays/README                  |   7 ++
 .../arm/boot/dts/overlays/adau1977-adc-overlay.dts |  53 +++++++++
 arch/arm/configs/bcm2709_defconfig                 |   1 +
 arch/arm/configs/bcmrpi_defconfig                  |   1 +
 sound/soc/bcm/Kconfig                              |   7 ++
 sound/soc/bcm/Makefile                             |   2 +
 sound/soc/bcm/adau1977-adc.c                       | 125 +++++++++++++++++++++
 8 files changed, 197 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/adau1977-adc-overlay.dts
 create mode 100644 sound/soc/bcm/adau1977-adc.c

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -12,6 +12,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y)
    RPI_DT_OVERLAYS=y
 endif
 
+dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -161,6 +161,13 @@ Params:
         and the other i2c baudrate parameters.
 
 
+Name:   adau1977-adc
+Info:   Overlay for activation of ADAU1977 ADC codec over I2C for control
+        and I2S for data.
+Load:   dtoverlay=adau1977-adc
+Params: <None>
+
+
 Name:   ads7846
 Info:   ADS7846 Touch controller
 Load:   dtoverlay=ads7846,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/adau1977-adc-overlay.dts
@@ -0,0 +1,53 @@
+// Definitions for ADAU1977 ADC
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+    
+	fragment@0 {
+		target = <&soc>;
+		
+		__overlay__ {
+			codec_supply: fixedregulator@0 {
+				compatible = "regulator-fixed";
+				regulator-name = "AVDD";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+			};
+		};
+	};
+	
+	fragment@1 {
+        	target = <&i2c>;
+        	
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			
+			adau1977: codec@11 {
+                        	compatible = "adi,adau1977";
+                        	reg = <0x11>;
+                        	reset-gpios = <&gpio 5 0>;
+                        	AVDD-supply = <&codec_supply>;
+                	};
+        	};
+	};
+
+	fragment@2 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@3 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "adi,adau1977-adc";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -861,6 +861,7 @@ CONFIG_SND_BCM2708_SOC_BOOMBERRY_DAC=m
 CONFIG_SND_BCM2708_SOC_BOOMBERRY_DIGI=m
 CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
 CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
+CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
 CONFIG_SND_SIMPLE_CARD=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -853,6 +853,7 @@ CONFIG_SND_BCM2708_SOC_BOOMBERRY_DAC=m
 CONFIG_SND_BCM2708_SOC_BOOMBERRY_DIGI=m
 CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
 CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
+CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
 CONFIG_SND_SIMPLE_CARD=m
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -78,3 +78,10 @@ config SND_BCM2708_SOC_RASPIDAC3
 	select SND_SOC_TPA6130A2
 	help
 	  Say Y or M if you want to add support for RaspiDAC Rev.3x.
+
+config SND_BCM2708_SOC_ADAU1977_ADC
+	tristate "Support for ADAU1977 ADC"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	select SND_SOC_ADAU1977_I2C
+	help
+	  Say Y or M if you want to add support for ADAU1977 ADC.
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -4,6 +4,7 @@ snd-soc-bcm2835-i2s-objs := bcm2835-i2s.
 obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o
 
 # BCM2708 Machine Support
+snd-soc-adau1977-adc-objs := adau1977-adc.o
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
 snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
 snd-soc-hifiberry-digi-objs := hifiberry_digi.o
@@ -15,6 +16,7 @@ snd-soc-rpi-proto-objs := rpi-proto.o
 snd-soc-iqaudio-dac-objs := iqaudio-dac.o
 snd-soc-raspidac3-objs := raspidac3.o
 
+obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
--- /dev/null
+++ b/sound/soc/bcm/adau1977-adc.c
@@ -0,0 +1,125 @@
+/*
+ * ASoC Driver for ADAU1977 ADC
+ *
+ * Author:	Andrey Grodzovsky <andrey2805@gmail.com>
+ *		Copyright 2016
+ *
+ * This file is based on hifibery_dac driver by Florian Meier.
+ * 
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+enum adau1977_clk_id {
+    ADAU1977_SYSCLK,
+};
+ 
+enum adau1977_sysclk_src {
+    ADAU1977_SYSCLK_SRC_MCLK,
+    ADAU1977_SYSCLK_SRC_LRCLK,
+};
+
+static int eval_adau1977_init(struct snd_soc_pcm_runtime *rtd)
+{
+	int ret;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	
+	ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, 0, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	return snd_soc_codec_set_sysclk(rtd->codec, ADAU1977_SYSCLK,
+			ADAU1977_SYSCLK_SRC_MCLK, 11289600, SND_SOC_CLOCK_IN);
+}
+ 
+static struct snd_soc_dai_link snd_rpi_adau1977_dai[] = {
+	{
+	.name = "adau1977",
+	.stream_name = "ADAU1977", 
+	.cpu_dai_name = "bcm2708-i2s.0", 
+	.codec_dai_name = "adau1977-hifi",
+	.platform_name = "bcm2708-i2s.0",
+	.codec_name = "adau1977.1-0011",
+	.init = eval_adau1977_init,
+	.dai_fmt = SND_SOC_DAIFMT_I2S |
+		SND_SOC_DAIFMT_NB_NF |
+		SND_SOC_DAIFMT_CBM_CFM,
+	},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_adau1977_adc = {
+	.name         = "snd_rpi_adau1977_adc",
+	.owner        = THIS_MODULE,
+	.dai_link     = snd_rpi_adau1977_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_adau1977_dai),
+};
+
+static int snd_adau1977_adc_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_adau1977_adc.dev = &pdev->dev;
+	if (pdev->dev.of_node) {
+	    struct device_node *i2s_node;
+	    struct snd_soc_dai_link *dai = &snd_rpi_adau1977_dai[0];
+	    i2s_node = of_parse_phandle(pdev->dev.of_node,
+					"i2s-controller", 0);
+
+	    if (i2s_node) {
+		dai->cpu_dai_name = NULL;
+		dai->cpu_of_node = i2s_node;
+		dai->platform_name = NULL;
+		dai->platform_of_node = i2s_node;
+	    }
+	}
+
+	ret = snd_soc_register_card(&snd_adau1977_adc);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_adau1977_adc_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_adau1977_adc);
+}
+
+static const struct of_device_id snd_adau1977_adc_of_match[] = {
+	{ .compatible = "adi,adau1977-adc", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, snd_adau1977_adc_of_match);
+
+static struct platform_driver snd_adau1977_adc_driver = {
+        .driver = {
+                .name   = "snd-adau1977-adc",
+                .owner  = THIS_MODULE,
+		.of_match_table = snd_adau1977_adc_of_match,
+        },
+        .probe          = snd_adau1977_adc_probe,
+        .remove         = snd_adau1977_adc_remove,
+};
+
+module_platform_driver(snd_adau1977_adc_driver);
+
+MODULE_AUTHOR("Andrey Grodzovsky <andrey2805@gmail.com>");
+MODULE_DESCRIPTION("ASoC Driver for ADAU1977 ADC");
+MODULE_LICENSE("GPL v2");
