From 08fec50dc8b898f329d1a44eedc1872895c195d6 Mon Sep 17 00:00:00 2001
From: Jan Grulich <jan@grulich.eu>
Date: Mon, 24 Aug 2015 16:03:47 +0100
Subject: [PATCH] RaspiDAC3 support

Signed-off-by: Jan Grulich <jan@grulich.eu>

config: fix RaspiDAC Rev.3x dependencies

Change depends to SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
like the other I2S soundcard drivers.

Signed-off-by: Matthias Reichl <hias@horus.com>
---
 sound/soc/bcm/Kconfig     |   8 ++
 sound/soc/bcm/Makefile    |   2 +
 sound/soc/bcm/raspidac3.c | 191 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 201 insertions(+)
 create mode 100644 sound/soc/bcm/raspidac3.c

--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -56,3 +56,11 @@ config SND_BCM2708_SOC_IQAUDIO_DAC
 	select SND_SOC_PCM512x_I2C
 	help
 	  Say Y or M if you want to add support for IQaudIO-DAC.
+
+config SND_BCM2708_SOC_RASPIDAC3
+	tristate "Support for RaspiDAC Rev.3x"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	select SND_SOC_PCM512x_I2C
+	select SND_SOC_TPA6130A2
+	help
+	  Say Y or M if you want to add support for RaspiDAC Rev.3x.
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -11,6 +11,7 @@ snd-soc-hifiberry-amp-objs := hifiberry_
 snd-soc-rpi-dac-objs := rpi-dac.o
 snd-soc-rpi-proto-objs := rpi-proto.o
 snd-soc-iqaudio-dac-objs := iqaudio-dac.o
+snd-soc-raspidac3-objs := raspidac3.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
@@ -19,3 +20,4 @@ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_A
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
 obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
--- /dev/null
+++ b/sound/soc/bcm/raspidac3.c
@@ -0,0 +1,191 @@
+/*
+ * ASoC Driver for RaspiDAC v3
+ *
+ * Author:	Jan Grulich <jan@grulich.eu>
+ *		Copyright 2015
+ *              based on code by Daniel Matuschek <daniel@hifiberry.com>
+ *		based on code by Florian Meier <florian.meier@koalo.de>
+ *
+ * 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 <sound/soc-dapm.h>
+
+#include "../codecs/pcm512x.h"
+#include "../codecs/tpa6130a2.h"
+
+/* sound card init */
+static int snd_rpi_raspidac3_init(struct snd_soc_pcm_runtime *rtd)
+{
+	int ret;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_EN, 0x08, 0x08);
+	snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_4, 0xf, 0x02);
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x00);
+
+	ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
+	if (ret < 0)
+		dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
+	else {
+		struct snd_kcontrol *kctl;
+
+		ret = tpa6130a2_add_controls(codec);
+		if (ret < 0)
+			dev_warn(card->dev, "Failed to add TPA6130A2 controls: %d\n",
+				 ret);
+		ret = snd_soc_limit_volume(card,
+					   "TPA6130A2 Headphone Playback Volume",
+					   54);
+		if (ret < 0)
+			dev_warn(card->dev, "Failed to set TPA6130A2 volume limit: %d\n",
+				 ret);
+		kctl = snd_soc_card_get_kcontrol(card,
+						 "TPA6130A2 Headphone Playback Volume");
+		if (kctl) {
+			strcpy(kctl->id.name, "Headphones Playback Volume");
+			/* disable the volume dB scale so alsamixer works */
+			kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		}
+
+		kctl = snd_soc_card_get_kcontrol(card,
+						 "TPA6130A2 Headphone Playback Switch");
+		if (kctl)
+			strcpy(kctl->id.name, "Headphones Playback Switch");
+	}
+
+	return 0;
+}
+
+/* set hw parameters */
+static int snd_rpi_raspidac3_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;
+
+	unsigned int sample_bits =
+		snd_pcm_format_physical_width(params_format(params));
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
+}
+
+/* startup */
+static int snd_rpi_raspidac3_startup(struct snd_pcm_substream *substream) {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x08);
+	tpa6130a2_stereo_enable(codec, 1);
+	return 0;
+}
+
+/* shutdown */
+static void snd_rpi_raspidac3_shutdown(struct snd_pcm_substream *substream) {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x00);
+	tpa6130a2_stereo_enable(codec, 0);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_raspidac3_ops = {
+	.hw_params = snd_rpi_raspidac3_hw_params,
+	.startup = snd_rpi_raspidac3_startup,
+	.shutdown = snd_rpi_raspidac3_shutdown,
+};
+
+/* interface setup */
+static struct snd_soc_dai_link snd_rpi_raspidac3_dai[] = {
+{
+	.name		= "RaspiDAC Rev.3x",
+	.stream_name	= "RaspiDAC HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm512x-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm512x.1-004c",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_raspidac3_ops,
+	.init		= snd_rpi_raspidac3_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_raspidac3 = {
+	.name         = "RaspiDAC Rev.3x HiFi Audio Card",
+	.dai_link     = snd_rpi_raspidac3_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_raspidac3_dai),
+};
+
+/* sound card test */
+static int snd_rpi_raspidac3_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_raspidac3.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+	    struct device_node *i2s_node;
+	    struct snd_soc_dai_link *dai = &snd_rpi_raspidac3_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_raspidac3);
+	if (ret)
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+/* sound card disconnect */
+static int snd_rpi_raspidac3_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_raspidac3);
+}
+
+static const struct of_device_id raspidac3_of_match[] = {
+	{ .compatible = "jg,raspidacv3", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, raspidac3_of_match);
+
+/* sound card platform driver */
+static struct platform_driver snd_rpi_raspidac3_driver = {
+	.driver = {
+		.name   = "snd-rpi-raspidac3",
+		.owner  = THIS_MODULE,
+		.of_match_table = raspidac3_of_match,
+	},
+	.probe          = snd_rpi_raspidac3_probe,
+	.remove         = snd_rpi_raspidac3_remove,
+};
+
+module_platform_driver(snd_rpi_raspidac3_driver);
+
+MODULE_AUTHOR("Jan Grulich <jan@grulich.eu>");
+MODULE_DESCRIPTION("ASoC Driver for RaspiDAC Rev.3x");
+MODULE_LICENSE("GPL v2");
