From 525cdff530e74a8428a60859f9308bca825463fd Mon Sep 17 00:00:00 2001
From: sandeepal <alsandeep@cem-solutions.net>
Date: Fri, 2 Jun 2017 18:59:46 +0530
Subject: [PATCH 088/454] Allo Digione Driver (#2048)

Driver for the Allo Digione soundcard

allo-digione: 192kHz clicking sound fix

See: https://github.com/raspberrypi/linux/pull/2149
---
 sound/soc/bcm/Kconfig        |   7 +
 sound/soc/bcm/Makefile       |   2 +
 sound/soc/bcm/allo-digione.c | 265 +++++++++++++++++++++++++++++++++++
 3 files changed, 274 insertions(+)
 create mode 100644 sound/soc/bcm/allo-digione.c

--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -176,6 +176,13 @@ config SND_BCM2708_SOC_ALLO_BOSS_DAC
 	help
 	  Say Y or M if you want to add support for Allo Boss DAC.
 
+config SND_BCM2708_SOC_ALLO_DIGIONE 
+        tristate "Support for Allo DigiOne"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	select SND_SOC_PCM512x_I2C
+	help
+	  Say Y or M if you want to add support for Allo DigiOne.
+
 config SND_BCM2708_SOC_FE_PI_AUDIO
 	tristate "Support for Fe-Pi-Audio"
 	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -34,6 +34,7 @@ snd-soc-dionaudio-loco-v2-objs := dionau
 snd-soc-allo-boss-dac-objs := allo-boss-dac.o
 snd-soc-allo-piano-dac-objs := allo-piano-dac.o
 snd-soc-allo-piano-dac-plus-objs := allo-piano-dac-plus.o
+snd-soc-allo-digione-objs := allo-digione.o
 snd-soc-pisound-objs := pisound.o
 snd-soc-fe-pi-audio-objs := fe-pi-audio.o
 
@@ -60,5 +61,6 @@ obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_L
 obj-$(CONFIG_SND_BCM2708_SOC_ALLO_BOSS_DAC) += snd-soc-allo-boss-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC_PLUS) += snd-soc-allo-piano-dac-plus.o
+obj-$(CONFIG_SND_BCM2708_SOC_ALLO_DIGIONE) += snd-soc-allo-digione.o
 obj-$(CONFIG_SND_PISOUND) += snd-soc-pisound.o
 obj-$(CONFIG_SND_BCM2708_SOC_FE_PI_AUDIO) += snd-soc-fe-pi-audio.o
--- /dev/null
+++ b/sound/soc/bcm/allo-digione.c
@@ -0,0 +1,265 @@
+/*
+ * ASoC Driver for Allo DigiOne
+ *
+ * Author: Baswaraj <jaikumar@cemsolutions.net>
+ *	   Copyright 2017
+ * based on code by Daniel Matuschek <info@crazy-audio.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 <linux/gpio/consumer.h>
+
+#include "../codecs/wm8804.h"
+
+static short int auto_shutdown_output;
+module_param(auto_shutdown_output, short,
+		S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped");
+
+#define CLK_44EN_RATE 22579200UL
+#define CLK_48EN_RATE 24576000UL
+
+static struct gpio_desc *snd_allo_clk44gpio;
+static struct gpio_desc *snd_allo_clk48gpio;
+
+static int samplerate = 44100;
+
+static uint32_t snd_allo_digione_enable_clock(int sample_rate)
+{
+	switch (sample_rate) {
+	case 11025:
+	case 22050:
+	case 44100:
+	case 88200:
+	case 176400:
+		gpiod_set_value_cansleep(snd_allo_clk44gpio, 1);
+		gpiod_set_value_cansleep(snd_allo_clk48gpio, 0);
+		return CLK_44EN_RATE;
+	default:
+		gpiod_set_value_cansleep(snd_allo_clk48gpio, 1);
+		gpiod_set_value_cansleep(snd_allo_clk44gpio, 0);
+		return CLK_48EN_RATE;
+	}
+}
+
+
+static int snd_allo_digione_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_allo_digione_startup(struct snd_pcm_substream *substream)
+{
+	/* turn on digital output */
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
+	return 0;
+}
+
+static void snd_allo_digione_shutdown(struct snd_pcm_substream *substream)
+{
+	/* turn off output */
+	if (auto_shutdown_output) {
+		/* turn off output */
+		struct snd_soc_pcm_runtime *rtd = substream->private_data;
+		struct snd_soc_codec *codec = rtd->codec;
+
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
+	}
+}
+
+static int snd_allo_digione_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 sampling_freq = 1;
+
+	int ret;
+
+	samplerate = params_rate(params);
+	mclk_freq = samplerate * 256;
+	mclk_div = WM8804_MCLKDIV_256FS;
+
+	sysclk = snd_allo_digione_enable_clock(samplerate);
+
+	switch (samplerate) {
+	case 32000:
+		sampling_freq = 0x03;
+		break;
+	case 44100:
+		sampling_freq = 0x00;
+		break;
+	case 48000:
+		sampling_freq = 0x02;
+		break;
+	case 88200:
+		sampling_freq = 0x08;
+		break;
+	case 96000:
+		sampling_freq = 0x0a;
+		break;
+	case 176400:
+		sampling_freq = 0x0c;
+		break;
+	case 192000:
+		sampling_freq = 0x0e;
+		break;
+	default:
+		dev_err(codec->dev,
+		"Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
+		samplerate);
+	}
+
+	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(codec->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);
+
+	/* set sampling frequency status bits */
+	snd_soc_update_bits(codec, WM8804_SPDTX4, 0x0f, sampling_freq);
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_allo_digione_ops = {
+	.hw_params	= snd_allo_digione_hw_params,
+	.startup	= snd_allo_digione_startup,
+	.shutdown	= snd_allo_digione_shutdown,
+};
+
+static struct snd_soc_dai_link snd_allo_digione_dai[] = {
+{
+	.name		= "Allo DigiOne",
+	.stream_name	= "Allo DigiOne 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_allo_digione_ops,
+	.init		= snd_allo_digione_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_allo_digione = {
+	.name         = "snd_allo_digione",
+	.driver_name  = "AlloDigiOne",
+	.owner        = THIS_MODULE,
+	.dai_link     = snd_allo_digione_dai,
+	.num_links    = ARRAY_SIZE(snd_allo_digione_dai),
+};
+
+static int snd_allo_digione_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_allo_digione.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai = &snd_allo_digione_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;
+		}
+
+		snd_allo_clk44gpio =
+			devm_gpiod_get(&pdev->dev, "clock44", GPIOD_OUT_LOW);
+		if (IS_ERR(snd_allo_clk44gpio))
+			dev_err(&pdev->dev, "devm_gpiod_get() failed\n");
+
+		snd_allo_clk48gpio =
+			devm_gpiod_get(&pdev->dev, "clock48", GPIOD_OUT_LOW);
+		if (IS_ERR(snd_allo_clk48gpio))
+			dev_err(&pdev->dev, "devm_gpiod_get() failed\n");
+	}
+
+	ret = snd_soc_register_card(&snd_allo_digione);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+			ret);
+
+	return ret;
+}
+
+static int snd_allo_digione_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_allo_digione);
+}
+
+static const struct of_device_id snd_allo_digione_of_match[] = {
+	{ .compatible = "allo,allo-digione", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, snd_allo_digione_of_match);
+
+static struct platform_driver snd_allo_digione_driver = {
+	.driver = {
+		.name		= "snd-allo-digione",
+		.owner		= THIS_MODULE,
+		.of_match_table	= snd_allo_digione_of_match,
+	},
+	.probe  = snd_allo_digione_probe,
+	.remove = snd_allo_digione_remove,
+};
+
+module_platform_driver(snd_allo_digione_driver);
+
+MODULE_AUTHOR("Baswaraj <jaikumar@cem-solutions.net>");
+MODULE_DESCRIPTION("ASoC Driver for Allo DigiOne");
+MODULE_LICENSE("GPL v2");
