openwrt/target/linux/brcm2708/patches-3.18/0036-ASoC-BCM2708-Add-support-for-RPi-DAC.patch

From 52fceff596533a847231d1f9b8ea13d4e6ee829b Mon Sep 17 00:00:00 2001
From: Florian Meier <florian.meier@koalo.de>
Date: Fri, 6 Dec 2013 20:50:28 +0100
Subject: [PATCH 036/114] ASoC: BCM2708: Add support for RPi-DAC

This adds a machine driver for the RPi-DAC.

Signed-off-by: Florian Meier <florian.meier@koalo.de>
---
 arch/arm/configs/bcmrpi_defconfig |  1 +
 arch/arm/mach-bcm2708/bcm2708.c   | 19 ++++++++
 sound/soc/bcm/Kconfig             |  7 +++
 sound/soc/bcm/Makefile            |  2 +
 sound/soc/bcm/rpi-dac.c           | 97 +++++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/Kconfig          |  4 ++
 sound/soc/codecs/Makefile         |  2 +
 sound/soc/codecs/pcm1794a.c       | 62 +++++++++++++++++++++++++
 8 files changed, 194 insertions(+)
 create mode 100644 sound/soc/bcm/rpi-dac.c
 create mode 100644 sound/soc/codecs/pcm1794a.c

diff --git a/arch/arm/configs/bcmrpi_defconfig b/arch/arm/configs/bcmrpi_defconfig
index dfd98df..f688da5 100644
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -756,6 +756,7 @@ CONFIG_SND_USB_6FIRE=m
 CONFIG_SND_SOC=m
 CONFIG_SND_BCM2708_SOC_I2S=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC=m
+CONFIG_SND_BCM2708_SOC_RPI_DAC=m
 CONFIG_SND_SIMPLE_CARD=m
 CONFIG_SOUND_PRIME=m
 CONFIG_HIDRAW=y
diff --git a/arch/arm/mach-bcm2708/bcm2708.c b/arch/arm/mach-bcm2708/bcm2708.c
index 50d4991..100c223 100644
--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -623,6 +623,20 @@ static struct platform_device snd_pcm5102a_codec_device = {
 };
 #endif
 
+#if defined(CONFIG_SND_BCM2708_SOC_RPI_DAC) || defined(CONFIG_SND_BCM2708_SOC_RPI_DAC_MODULE)
+static struct platform_device snd_rpi_dac_device = {
+        .name = "snd-rpi-dac",
+        .id = 0,
+        .num_resources = 0,
+};
+
+static struct platform_device snd_pcm1794a_codec_device = {
+        .name = "pcm1794a-codec",
+        .id = -1,
+        .num_resources = 0,
+};
+#endif
+
 int __init bcm_register_device(struct platform_device *pdev)
 {
 	int ret;
@@ -752,6 +766,11 @@ void __init bcm2708_init(void)
         bcm_register_device(&snd_pcm5102a_codec_device);
 #endif
 
+#if defined(CONFIG_SND_BCM2708_SOC_RPI_DAC) || defined(CONFIG_SND_BCM2708_SOC_RPI_DAC_MODULE)
+        bcm_register_device(&snd_rpi_dac_device);
+        bcm_register_device(&snd_pcm1794a_codec_device);
+#endif
+
 	for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 		struct amba_device *d = amba_devs[i];
 		amba_device_register(d, &iomem_resource);
diff --git a/sound/soc/bcm/Kconfig b/sound/soc/bcm/Kconfig
index b36a62f..714841d 100644
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -25,3 +25,10 @@ config SND_BCM2708_SOC_HIFIBERRY_DAC
         select SND_SOC_PCM5102A
         help
          Say Y or M if you want to add support for HifiBerry DAC.
+
+config SND_BCM2708_SOC_RPI_DAC
+        tristate "Support for RPi-DAC"
+        depends on SND_BCM2708_SOC_I2S
+        select SND_SOC_PCM1794A
+        help
+         Say Y or M if you want to add support for RPi-DAC.
diff --git a/sound/soc/bcm/Makefile b/sound/soc/bcm/Makefile
index be90a49cb..ccc9809 100644
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -10,5 +10,7 @@ obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
 
 # BCM2708 Machine Support
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
+snd-soc-rpi-dac-objs := rpi-dac.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
diff --git a/sound/soc/bcm/rpi-dac.c b/sound/soc/bcm/rpi-dac.c
new file mode 100644
index 0000000..6d6e0ba
--- /dev/null
+++ b/sound/soc/bcm/rpi-dac.c
@@ -0,0 +1,97 @@
+/*
+ * ASoC Driver for RPi-DAC.
+ *
+ * Author:	Florian Meier <florian.meier@koalo.de>
+ *		Copyright 2013
+ *
+ * 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>
+
+static int snd_rpi_rpi_dac_init(struct snd_soc_pcm_runtime *rtd)
+{
+	return 0;
+}
+
+static int snd_rpi_rpi_dac_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_rpi_dac_ops = {
+	.hw_params = snd_rpi_rpi_dac_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_rpi_dac_dai[] = {
+{
+	.name		= "RPi-DAC",
+	.stream_name	= "RPi-DAC HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm1794a-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm1794a-codec",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_rpi_dac_ops,
+	.init		= snd_rpi_rpi_dac_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_rpi_dac = {
+	.name         = "snd_rpi_rpi_dac",
+	.dai_link     = snd_rpi_rpi_dac_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_rpi_dac_dai),
+};
+
+static int snd_rpi_rpi_dac_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_rpi_dac.dev = &pdev->dev;
+	ret = snd_soc_register_card(&snd_rpi_rpi_dac);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_rpi_rpi_dac_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_rpi_dac);
+}
+
+static struct platform_driver snd_rpi_rpi_dac_driver = {
+        .driver = {
+                .name   = "snd-rpi-dac",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = snd_rpi_rpi_dac_probe,
+        .remove         = snd_rpi_rpi_dac_remove,
+};
+
+module_platform_driver(snd_rpi_rpi_dac_driver);
+
+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
+MODULE_DESCRIPTION("ASoC Driver for RPi-DAC");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 0ef8bb7..3c236a6 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -81,6 +81,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_PCM512x_SPI if SPI_MASTER
 	select SND_SOC_RT286 if I2C
 	select SND_SOC_PCM5102A if I2C
+	select SND_SOC_PCM1794A if I2C
 	select SND_SOC_RT5631 if I2C
 	select SND_SOC_RT5640 if I2C
 	select SND_SOC_RT5645 if I2C
@@ -487,6 +488,9 @@ config SND_SOC_RT286
 	tristate
 	depends on I2C
 
+config SND_SOC_PCM1794A
+	tristate
+
 config SND_SOC_PCM5102A
 	tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 7b606e6..2a7f823 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -74,6 +74,7 @@ snd-soc-pcm512x-i2c-objs := pcm512x-i2c.o
 snd-soc-pcm512x-spi-objs := pcm512x-spi.o
 snd-soc-rl6231-objs := rl6231.o
 snd-soc-rt286-objs := rt286.o
+snd-soc-pcm1794a-objs := pcm1794a.o
 snd-soc-pcm5102a-objs := pcm5102a.o
 snd-soc-rt5631-objs := rt5631.o
 snd-soc-rt5640-objs := rt5640.o
@@ -251,6 +252,7 @@ obj-$(CONFIG_SND_SOC_PCM512x_I2C)	+= snd-soc-pcm512x-i2c.o
 obj-$(CONFIG_SND_SOC_PCM512x_SPI)	+= snd-soc-pcm512x-spi.o
 obj-$(CONFIG_SND_SOC_RL6231)	+= snd-soc-rl6231.o
 obj-$(CONFIG_SND_SOC_RT286)	+= snd-soc-rt286.o
+obj-$(CONFIG_SND_SOC_PCM1794A)	+= snd-soc-pcm1794a.o
 obj-$(CONFIG_SND_SOC_PCM5102A)	+= snd-soc-pcm5102a.o
 obj-$(CONFIG_SND_SOC_RT5631)	+= snd-soc-rt5631.o
 obj-$(CONFIG_SND_SOC_RT5640)	+= snd-soc-rt5640.o
diff --git a/sound/soc/codecs/pcm1794a.c b/sound/soc/codecs/pcm1794a.c
new file mode 100644
index 0000000..b4eaa44
--- /dev/null
+++ b/sound/soc/codecs/pcm1794a.c
@@ -0,0 +1,62 @@
+/*
+ * Driver for the PCM1794A codec
+ *
+ * Author:	Florian Meier <florian.meier@koalo.de>
+ *		Copyright 2013
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/soc.h>
+
+static struct snd_soc_dai_driver pcm1794a_dai = {
+	.name = "pcm1794a-hifi",
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE |
+			   SNDRV_PCM_FMTBIT_S24_LE
+	},
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_pcm1794a;
+
+static int pcm1794a_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_pcm1794a,
+			&pcm1794a_dai, 1);
+}
+
+static int pcm1794a_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver pcm1794a_codec_driver = {
+	.probe 		= pcm1794a_probe,
+	.remove 	= pcm1794a_remove,
+	.driver		= {
+		.name	= "pcm1794a-codec",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(pcm1794a_codec_driver);
+
+MODULE_DESCRIPTION("ASoC PCM1794A codec driver");
+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
+MODULE_LICENSE("GPL v2");
-- 
1.8.3.2