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openwrtv4/target/linux/brcm2708/patches-4.4/0065-ASoC-Add-support-for-Rpi-DAC.patch
Felix Fietkau 4224b52c3a brcm2708: add linux 4.4 support 
- random-bcm2708 and spi-bcm2708 have been removed.
- sound-soc-bcm2708-i2s has been upstreamed as sound-soc-bcm2835-i2s.

Let's keep linux 4.1 for a while, since linux 4.4 appears to have some issues
with multicast traffic on RPi ethernet:
https://gist.github.com/Noltari/5b1cfdecce5ed4bc08fd

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48266
2016-01-17 10:42:23 +00:00

275 lines
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From e6877f42823f6acd80d27b86816a0d87f35ea004 Mon Sep 17 00:00:00 2001
From: Florian Meier <florian.meier@koalo.de>
Date: Fri, 22 Nov 2013 19:21:34 +0100
Subject: [PATCH 065/127] ASoC: Add support for Rpi-DAC
---
sound/soc/bcm/Kconfig | 7 +++
sound/soc/bcm/Makefile | 2 +
sound/soc/bcm/rpi-dac.c | 118 ++++++++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/Kconfig | 9 ++++
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/pcm1794a.c | 69 ++++++++++++++++++++++++++
6 files changed, 207 insertions(+)
create mode 100644 sound/soc/bcm/rpi-dac.c
create mode 100644 sound/soc/codecs/pcm1794a.c
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -14,3 +14,10 @@ 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 || SND_BCM2835_SOC_I2S
+ select SND_SOC_PCM1794A
+ help
+ Say Y or M if you want to add support for RPi-DAC.
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -5,5 +5,7 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd
# BCM2708 Machine Support
snd-soc-hifiberry-dac-objs := hifiberry_dac.o
+snd-soc-rpi-dac-objs := rpi-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
--- /dev/null
+++ b/sound/soc/bcm/rpi-dac.c
@@ -0,0 +1,118 @@
+/*
+ * 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;
+
+ if (pdev->dev.of_node) {
+ struct device_node *i2s_node;
+ struct snd_soc_dai_link *dai = &snd_rpi_rpi_dac_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_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 const struct of_device_id snd_rpi_rpi_dac_of_match[] = {
+ { .compatible = "rpi,rpi-dac", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_rpi_dac_of_match);
+
+static struct platform_driver snd_rpi_rpi_dac_driver = {
+ .driver = {
+ .name = "snd-rpi-dac",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_rpi_rpi_dac_of_match,
+ },
+ .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");
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -90,6 +90,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_RT286 if I2C
select SND_SOC_RT298 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
@@ -550,6 +551,14 @@ config SND_SOC_RT298
tristate
depends on I2C
+config SND_SOC_RT298
+ tristate
+ depends on I2C
+
+config SND_SOC_PCM1794A
+ tristate
+ depends on I2C
+
config SND_SOC_PCM5102A
tristate
depends on I2C
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -85,6 +85,7 @@ snd-soc-rl6231-objs := rl6231.o
snd-soc-rl6347a-objs := rl6347a.o
snd-soc-rt286-objs := rt286.o
snd-soc-rt298-objs := rt298.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
@@ -281,6 +282,7 @@ obj-$(CONFIG_SND_SOC_RL6231) += snd-soc-
obj-$(CONFIG_SND_SOC_RL6347A) += snd-soc-rl6347a.o
obj-$(CONFIG_SND_SOC_RT286) += snd-soc-rt286.o
obj-$(CONFIG_SND_SOC_RT298) += snd-soc-rt298.o
+obj-$(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
--- /dev/null
+++ b/sound/soc/codecs/pcm1794a.c
@@ -0,0 +1,69 @@
+/*
+ * 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 const struct of_device_id pcm1794a_of_match[] = {
+ { .compatible = "ti,pcm1794a", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pcm1794a_of_match);
+
+static struct platform_driver pcm1794a_codec_driver = {
+ .probe = pcm1794a_probe,
+ .remove = pcm1794a_remove,
+ .driver = {
+ .name = "pcm1794a-codec",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pcm1794a_of_match),
+ },
+};
+
+module_platform_driver(pcm1794a_codec_driver);
+
+MODULE_DESCRIPTION("ASoC PCM1794A codec driver");
+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
+MODULE_LICENSE("GPL v2");
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