OpenWrt – Rev 4
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From 9bbd8a3c8378eac9e605e0f37f4005583e122527 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>
---
sound/soc/bcm/Kconfig | 7 +++
sound/soc/bcm/Makefile | 2 +
sound/soc/bcm/adau1977-adc.c | 125 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 sound/soc/bcm/adau1977-adc.c
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -87,3 +87,10 @@ 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
@@ -9,6 +9,7 @@ snd-soc-cygnus-objs := cygnus-pcm.o cygn
obj-$(CONFIG_SND_SOC_CYGNUS) += snd-soc-cygnus.o
# BCM2708 Machine Support
+snd-soc-adau1977-adc-objs := adau1977-adc.o
snd-soc-hifiberry-amp-objs := hifiberry_amp.o
snd-soc-hifiberry-dac-objs := hifiberry_dac.o
snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
@@ -20,6 +21,7 @@ snd-soc-rpi-proto-objs := rpi-proto.o
snd-soc-iqaudio-dac-objs := iqaudio-dac.o
snd-soc-raspidac3-objs := raspidac3.o
+obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
--- /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");
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