From be377792090556422c0735f3486b502b991da36d Mon Sep 17 00:00:00 2001
From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
Date: Sat, 2 Jul 2016 16:26:19 +0100
Subject: [PATCH] Add support for Dion Audio LOCO DAC-AMP HAT

Using dedicated machine driver and pcm5102a codec driver.

Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
---
 arch/arm/boot/dts/overlays/Makefile                |   1 +
 arch/arm/boot/dts/overlays/README                  |   6 +
 .../boot/dts/overlays/dionaudio-loco-overlay.dts   |  39 +++++++
 arch/arm/configs/bcm2709_defconfig                 |   1 +
 arch/arm/configs/bcmrpi_defconfig                  |   1 +
 sound/soc/bcm/Kconfig                              |   7 ++
 sound/soc/bcm/Makefile                             |   3 +-
 sound/soc/bcm/dionaudio_loco.c                     | 121 +++++++++++++++++++++
 8 files changed, 178 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boot/dts/overlays/dionaudio-loco-overlay.dts
 create mode 100644 sound/soc/bcm/dionaudio_loco.c

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -20,6 +20,7 @@ dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtb
 dtbo-$(RPI_DT_OVERLAYS) += audioinjector-wm8731-audio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += dionaudio-loco.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -268,6 +268,12 @@ Params: gpiopin                 GPIO con
                                 (default 4)
 
 
+Name:   dionaudio-loco
+Info:   Configures the Dion Audio LOCO DAC-AMP
+Load:   dtoverlay=dionaudio-loco
+Params: <None>
+
+
 Name:   dpi24
 Info:   Overlay for a generic 24-bit DPI display
         This uses GPIOs 0-27 (so no I2C, uart etc.), and activates the output
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/dionaudio-loco-overlay.dts
@@ -0,0 +1,39 @@
+// Definitions for Dion Audio LOCO DAC-AMP
+
+/*
+ * PCM5242 DAC (in hardware mode) and TPA3118 AMP.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			pcm5102a-codec {
+				#sound-dai-cells = <0>;
+				compatible = "ti,pcm5102a";
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "dionaudio,loco-pcm5242-tpa3118";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -870,6 +870,7 @@ CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
 CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
 CONFIG_SND_DIGIDAC1_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
+CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
 CONFIG_SND_SIMPLE_CARD=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -862,6 +862,7 @@ CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
 CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
 CONFIG_SND_DIGIDAC1_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
+CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
 CONFIG_SND_SIMPLE_CARD=m
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -107,3 +107,10 @@ config SND_DIGIDAC1_SOUNDCARD
         select SND_SOC_WM8741
         help
          Say Y or M if you want to add support for Red Rocks Audio DigiDAC1 board.
+
+config SND_BCM2708_SOC_DIONAUDIO_LOCO
+	tristate "Support for Dion Audio LOCO DAC-AMP"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	select SND_SOC_PCM5102a
+	help
+	  Say Y or M if you want to add support for Dion Audio LOCO.
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -18,6 +18,7 @@ snd-soc-iqaudio-digi-objs := iqaudio_dig
 snd-soc-raspidac3-objs := raspidac3.o
 snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
 snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
+snd-soc-dionaudio-loco-objs := dionaudio_loco.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
@@ -33,4 +34,4 @@ obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DIG
 obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
 obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
 obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
-
+obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO) += snd-soc-dionaudio-loco.o
--- /dev/null
+++ b/sound/soc/bcm/dionaudio_loco.c
@@ -0,0 +1,121 @@
+/*
+ * ASoC Driver for Dion Audio LOCO DAC-AMP
+ *
+ * Author:      Miquel Blauw <info@dionaudio.nl>
+ *              Copyright 2016
+ *
+ * Based on the software of the RPi-DAC writen 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>
+
+static int snd_rpi_dionaudio_loco_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);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_dionaudio_loco_ops = {
+	.hw_params = snd_rpi_dionaudio_loco_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_dionaudio_loco_dai[] = {
+{
+	.name		= "DionAudio LOCO",
+	.stream_name	= "DionAudio LOCO DAC-AMP",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm5102a-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm5102a-codec",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S |
+			  SND_SOC_DAIFMT_NB_NF |
+			  SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_dionaudio_loco_ops,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_dionaudio_loco = {
+	.name		= "snd_rpi_dionaudio_loco",
+	.dai_link	= snd_rpi_dionaudio_loco_dai,
+	.num_links	= ARRAY_SIZE(snd_rpi_dionaudio_loco_dai),
+};
+
+static int snd_rpi_dionaudio_loco_probe(struct platform_device *pdev)
+{
+	struct device_node *np;
+	int ret = 0;
+
+	snd_rpi_dionaudio_loco.dev = &pdev->dev;
+
+	np = pdev->dev.of_node;
+	if (np) {
+		struct snd_soc_dai_link *dai = &snd_rpi_dionaudio_loco_dai[0];
+		struct device_node *i2s_np;
+
+		i2s_np = of_parse_phandle(np, "i2s-controller", 0);
+		if (i2s_np) {
+			dai->cpu_dai_name = NULL;
+			dai->cpu_of_node = i2s_np;
+			dai->platform_name = NULL;
+			dai->platform_of_node = i2s_np;
+		}
+	}
+
+	ret = snd_soc_register_card(&snd_rpi_dionaudio_loco);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+			ret);
+
+	return ret;
+}
+
+static int snd_rpi_dionaudio_loco_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_dionaudio_loco);
+}
+
+static const struct of_device_id snd_rpi_dionaudio_loco_of_match[] = {
+	{ .compatible = "dionaudio,loco-pcm5242-tpa3118", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_dionaudio_loco_of_match);
+
+static struct platform_driver snd_rpi_dionaudio_loco_driver = {
+	.driver = {
+		.name		= "snd-dionaudio-loco",
+		.owner		= THIS_MODULE,
+		.of_match_table	= snd_rpi_dionaudio_loco_of_match,
+	},
+	.probe  = snd_rpi_dionaudio_loco_probe,
+	.remove = snd_rpi_dionaudio_loco_remove,
+};
+
+module_platform_driver(snd_rpi_dionaudio_loco_driver);
+
+MODULE_AUTHOR("Miquel Blauw <info@dionaudio.nl>");
+MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO");
+MODULE_LICENSE("GPL v2");
