From 234b6a3cfd5bc1fb341c01f8ac773956f5af42cd 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>
---
 sound/soc/bcm/dionaudio_loco.c | 115 +++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 sound/soc/bcm/dionaudio_loco.c

--- /dev/null
+++ b/sound/soc/bcm/dionaudio_loco.c
@@ -0,0 +1,115 @@
+/*
+ * 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 = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_dionaudio_loco);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+			ret);
+
+	return ret;
+}
+
+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,
+};
+
+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");