openwrt/target/linux/brcm2708/patches-3.18/0038-ASoC-BCM-Add-support-for-HiFiBerry-Digi.-Driver-is-b.patch

From bccfebf3bc4457faddaa65e3492ec9f07cb5750b Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <info@crazy-audio.com>
Date: Wed, 15 Jan 2014 21:42:08 +0100
Subject: [PATCH 038/114] ASoC: BCM:Add support for HiFiBerry Digi. Driver is
 based on the patched WM8804 driver.

Signed-off-by: Daniel Matuschek <daniel@matuschek.net>
---
 sound/soc/bcm/Kconfig          |   7 ++
 sound/soc/bcm/Makefile         |   2 +
 sound/soc/bcm/hifiberry_digi.c | 153 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 162 insertions(+)
 create mode 100644 sound/soc/bcm/hifiberry_digi.c

--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -26,6 +26,13 @@ config SND_BCM2708_SOC_HIFIBERRY_DAC
         help
          Say Y or M if you want to add support for HifiBerry DAC.
 
+config SND_BCM2708_SOC_HIFIBERRY_DIGI
+        tristate "Support for HifiBerry Digi"
+        depends on SND_BCM2708_SOC_I2S
+        select SND_SOC_WM8804
+        help
+         Say Y or M if you want to add support for HifiBerry Digi S/PDIF output board.
+
 config SND_BCM2708_SOC_RPI_DAC
         tristate "Support for RPi-DAC"
         depends on SND_BCM2708_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -10,7 +10,9 @@ obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd
 
 # BCM2708 Machine Support
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
+snd-soc-hifiberry-digi-objs := hifiberry_digi.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_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
--- /dev/null
+++ b/sound/soc/bcm/hifiberry_digi.c
@@ -0,0 +1,153 @@
+/*
+ * ASoC Driver for HifiBerry Digi
+ *
+ * Author: Daniel Matuschek <info@crazy-audio.com>
+ * based on the HifiBerry DAC driver by 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>
+
+#include "../codecs/wm8804.h"
+
+static int samplerate=44100;
+
+static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_codec *codec = rtd->codec;
+
+	/* enable TX output */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+	return 0;
+}
+
+static int snd_rpi_hifiberry_digi_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 *codec_dai = rtd->codec_dai;
+	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	int sysclk = 27000000; /* This is fixed on this board */
+
+	long mclk_freq=0;
+	int mclk_div=1;
+
+	int ret;
+
+	samplerate = params_rate(params);
+
+	switch (samplerate) {
+		case 44100:
+		case 48000:
+		case 88200:
+		case 96000:
+			mclk_freq=samplerate*256;
+			mclk_div=WM8804_MCLKDIV_256FS;
+			break;
+		case 176400:
+		case 192000:
+			mclk_freq=samplerate*128;
+			mclk_div=WM8804_MCLKDIV_128FS;
+			break;
+		default:
+			dev_err(substream->pcm->dev,
+			"Failed to set WM8804 SYSCLK, unsupported samplerate\n");
+	}
+
+	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
+	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
+					sysclk, SND_SOC_CLOCK_OUT);
+	if (ret < 0) {
+		dev_err(substream->pcm->dev,
+		"Failed to set WM8804 SYSCLK: %d\n", ret);
+		return ret;
+	}
+
+	/* Enable TX output */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+	/* Power on */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai,64);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_hifiberry_digi_ops = {
+	.hw_params = snd_rpi_hifiberry_digi_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_hifiberry_digi_dai[] = {
+{
+	.name		= "HifiBerry Digi",
+	.stream_name	= "HifiBerry Digi HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "wm8804-spdif",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "wm8804.1-003b",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBM_CFM,
+	.ops		= &snd_rpi_hifiberry_digi_ops,
+	.init		= snd_rpi_hifiberry_digi_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_hifiberry_digi = {
+	.name         = "snd_rpi_hifiberry_digi",
+	.dai_link     = snd_rpi_hifiberry_digi_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_digi_dai),
+};
+
+static int snd_rpi_hifiberry_digi_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_hifiberry_digi.dev = &pdev->dev;
+	ret = snd_soc_register_card(&snd_rpi_hifiberry_digi);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_rpi_hifiberry_digi_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_hifiberry_digi);
+}
+
+static struct platform_driver snd_rpi_hifiberry_digi_driver = {
+	.driver = {
+		.name   = "snd-hifiberry-digi",
+		.owner  = THIS_MODULE,
+	},
+	.probe          = snd_rpi_hifiberry_digi_probe,
+	.remove         = snd_rpi_hifiberry_digi_remove,
+};
+
+module_platform_driver(snd_rpi_hifiberry_digi_driver);
+
+MODULE_AUTHOR("Daniel Matuschek <info@crazy-audio.com>");
+MODULE_DESCRIPTION("ASoC Driver for HifiBerry Digi");
+MODULE_LICENSE("GPL v2");