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>

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.

sound/soc/bcm/Makefile

@@ -4,6 +4,7 @@ snd-soc-bcm2835-i2s-objs := bcm2835-i2s.o
 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

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");