path: root/target/linux/bcm27xx/patches-4.19/950-0791-sound-Add-the-HiFiBerry-DAC-HD-version.patch

From bb4781b1dac98688a3cf64cf728a64d811ca6add Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Schambacher?=
 <j-schambacher@users.noreply.github.com>
Date: Tue, 21 Jan 2020 15:58:39 +0100
Subject: [PATCH] sound: Add the HiFiBerry DAC+HD version

This adds the driver for the DAC+HD version supporting HiFiBerry's
PCM179x based DACs. It also adds PLL control for clock generation.

Signed-off-by: Joerg Schambacher <joerg@i2audio.com>
---
 arch/arm/boot/dts/overlays/Makefile           |   1 +
 arch/arm/boot/dts/overlays/README             |   6 +
 .../overlays/hifiberry-dacplushd-overlay.dts  | 106 ++++++
 drivers/clk/Makefile                          |   1 +
 drivers/clk/clk-hifiberry-dachd.c             | 333 ++++++++++++++++++
 sound/soc/bcm/Kconfig                         |   7 +
 sound/soc/bcm/Makefile                        |   2 +
 sound/soc/bcm/hifiberry_dacplushd.c           | 235 ++++++++++++
 13 files changed, 696 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/hifiberry-dacplushd-overlay.dts
 create mode 100644 drivers/clk/clk-hifiberry-dachd.c
 create mode 100644 sound/soc/bcm/hifiberry_dacplushd.c

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -57,6 +57,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	hifiberry-dacplusadc.dtbo \
 	hifiberry-dacplusadcpro.dtbo \
 	hifiberry-dacplusdsp.dtbo \
+	hifiberry-dacplushd.dtbo \
 	hifiberry-digi.dtbo \
 	hifiberry-digi-pro.dtbo \
 	hy28a.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -956,6 +956,12 @@ Load:   dtoverlay=hifiberry-dacplusdsp
 Params: <None>
 
 
+Name:   hifiberry-dacplushd
+Info:   Configures the HifiBerry DAC+ HD audio card
+Load:   dtoverlay=hifiberry-dacplushd
+Params: <None>
+
+
 Name:   hifiberry-digi
 Info:   Configures the HifiBerry Digi and Digi+ audio card
 Load:   dtoverlay=hifiberry-digi
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/hifiberry-dacplushd-overlay.dts
@@ -0,0 +1,106 @@
+// Definitions for HiFiBerry DAC+ HD
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target-path = "/clocks";
+		__overlay__ {
+			dachd_osc: pll_dachd_osc {
+				compatible = "hifiberry,dachd-clk";
+				#clock-cells = <0>;
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@2 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pcm1792a@4c {
+				compatible = "ti,pcm1792a";
+				#sound-dai-cells = <0>;
+				#clock-cells = <0>;
+				clocks = <&dachd_osc>;
+				reg = <0x4c>;
+				status = "okay";
+			};
+			pll: pll@62 {
+				compatible = "hifiberry,dachd-clk";
+				#clock-cells = <0>;
+				reg = <0x62>;
+				clocks = <&dachd_osc>;
+				status = "okay";
+				common_pll_regs = [
+					02 53 03 00 07 20 0F 00
+					10 0D 11 1D 12 0D 13 8C
+					14 8C 15 8C 16 8C 17 8C
+					18 2A 1C 00 1D 0F 1F 00
+					2A 00 2C 00 2F 00 30 00
+					31 00 32 00 34 00 37 00
+					38 00 39 00 3A 00 3B 01
+					3E 00 3F 00 40 00 41 00
+					5A 00 5B 00 95 00 96 00
+					97 00 98 00 99 00 9A 00
+					9B 00 A2 00 A3 00 A4 00
+					B7 92 ];
+				192k_pll_regs = [
+					1A 0C 1B 35 1E F0 20 09
+					21 50 2B 02 2D 10 2E 40
+					33 01 35 22 36 80 3C 22
+					3D 46 ];
+				96k_pll_regs = [
+					1A 0C 1B 35 1E F0 20 09
+					21 50 2B 02 2D 10 2E 40
+					33 01 35 47 36 00 3C 32
+					3D 46 ];
+				48k_pll_regs = [
+					1A 0C 1B 35 1E F0 20 09
+					21 50 2B 02 2D 10 2E 40
+					33 01 35 90 36 00 3C 42
+					3D 46 ];
+				176k4_pll_regs = [
+					1A 3D 1B 09 1E F3 20 13
+					21 75 2B 04 2D 11 2E E0
+					33 02 35 25 36 C0 3C 22
+					3D 7A ];
+				88k2_pll_regs = [
+					1A 3D 1B 09 1E F3 20 13
+					21 75 2B 04 2D 11 2E E0
+					33 01 35 4D 36 80 3C 32
+					3D 7A ];
+				44k1_pll_regs = [
+					1A 3D 1B 09 1E F3 20 13
+					21 75 2B 04 2D 11 2E E0
+					33 01 35 9D 36 00 3C 42
+					3D 7A ];
+			};
+		};
+	};
+
+	fragment@3 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "hifiberry,hifiberry-dacplushd";
+			i2s-controller = <&i2s>;
+			clocks = <&pll 0>;
+			reset-gpio = <&gpio 16 GPIO_ACTIVE_LOW>;
+			status = "okay";
+		};
+	};
+
+};
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_COMMON_CLK_ASPEED)		+= clk-
 obj-$(CONFIG_ARCH_HIGHBANK)		+= clk-highbank.o
 obj-$(CONFIG_CLK_HSDK)			+= clk-hsdk-pll.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += clk-hifiberry-dacpro.o
+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSHD) += clk-hifiberry-dachd.o
 obj-$(CONFIG_COMMON_CLK_MAX77686)	+= clk-max77686.o
 obj-$(CONFIG_COMMON_CLK_MAX9485)	+= clk-max9485.o
 obj-$(CONFIG_ARCH_MOXART)		+= clk-moxart.o
--- /dev/null
+++ b/drivers/clk/clk-hifiberry-dachd.c
@@ -0,0 +1,333 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Clock Driver for HiFiBerry DAC+ HD
+ *
+ * Author: Joerg Schambacher, i2Audio GmbH for HiFiBerry
+ *         Copyright 2020
+ *
+ * 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/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+
+#define NO_PLL_RESET			0
+#define PLL_RESET			1
+#define HIFIBERRY_PLL_MAX_REGISTER	256
+#define DEFAULT_RATE			44100
+
+static struct reg_default hifiberry_pll_reg_defaults[] = {
+	{0x02, 0x53}, {0x03, 0x00}, {0x07, 0x20}, {0x0F, 0x00},
+	{0x10, 0x0D}, {0x11, 0x1D}, {0x12, 0x0D}, {0x13, 0x8C},
+	{0x14, 0x8C}, {0x15, 0x8C}, {0x16, 0x8C}, {0x17, 0x8C},
+	{0x18, 0x2A}, {0x1C, 0x00}, {0x1D, 0x0F}, {0x1F, 0x00},
+	{0x2A, 0x00}, {0x2C, 0x00}, {0x2F, 0x00}, {0x30, 0x00},
+	{0x31, 0x00}, {0x32, 0x00}, {0x34, 0x00}, {0x37, 0x00},
+	{0x38, 0x00}, {0x39, 0x00}, {0x3A, 0x00}, {0x3B, 0x01},
+	{0x3E, 0x00}, {0x3F, 0x00}, {0x40, 0x00}, {0x41, 0x00},
+	{0x5A, 0x00}, {0x5B, 0x00}, {0x95, 0x00}, {0x96, 0x00},
+	{0x97, 0x00}, {0x98, 0x00}, {0x99, 0x00}, {0x9A, 0x00},
+	{0x9B, 0x00}, {0xA2, 0x00}, {0xA3, 0x00}, {0xA4, 0x00},
+	{0xB7, 0x92},
+	{0x1A, 0x3D}, {0x1B, 0x09}, {0x1E, 0xF3}, {0x20, 0x13},
+	{0x21, 0x75}, {0x2B, 0x04}, {0x2D, 0x11}, {0x2E, 0xE0},
+	{0x3D, 0x7A},
+	{0x35, 0x9D}, {0x36, 0x00}, {0x3C, 0x42},
+	{ 177, 0xAC},
+};
+static struct reg_default common_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_common_pll_regs;
+static struct reg_default dedicated_192k_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_192k_pll_regs;
+static struct reg_default dedicated_96k_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_96k_pll_regs;
+static struct reg_default dedicated_48k_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_48k_pll_regs;
+static struct reg_default dedicated_176k4_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_176k4_pll_regs;
+static struct reg_default dedicated_88k2_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_88k2_pll_regs;
+static struct reg_default dedicated_44k1_pll_regs[HIFIBERRY_PLL_MAX_REGISTER];
+static int num_dedicated_44k1_pll_regs;
+
+/**
+ * struct clk_hifiberry_drvdata - Common struct to the HiFiBerry DAC HD Clk
+ * @hw: clk_hw for the common clk framework
+ */
+struct clk_hifiberry_drvdata {
+	struct regmap *regmap;
+	struct clk *clk;
+	struct clk_hw hw;
+	unsigned long rate;
+};
+
+#define to_hifiberry_clk(_hw) \
+	container_of(_hw, struct clk_hifiberry_drvdata, hw)
+
+static int clk_hifiberry_dachd_write_pll_regs(struct regmap *regmap,
+				struct reg_default *regs,
+				int num, int do_pll_reset)
+{
+	int i;
+	int ret = 0;
+	char pll_soft_reset[] = { 177, 0xAC, };
+
+	for (i = 0; i < num; i++) {
+		ret |= regmap_write(regmap, regs[i].reg, regs[i].def);
+		if (ret)
+			return ret;
+	}
+	if (do_pll_reset) {
+		ret |= regmap_write(regmap, pll_soft_reset[0],
+						pll_soft_reset[1]);
+		mdelay(10);
+	}
+	return ret;
+}
+
+static unsigned long clk_hifiberry_dachd_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	return to_hifiberry_clk(hw)->rate;
+}
+
+static long clk_hifiberry_dachd_round_rate(struct clk_hw *hw,
+	unsigned long rate, unsigned long *parent_rate)
+{
+	return rate;
+}
+
+static int clk_hifiberry_dachd_set_rate(struct clk_hw *hw,
+	unsigned long rate, unsigned long parent_rate)
+{
+	int ret;
+	struct clk_hifiberry_drvdata *drvdata = to_hifiberry_clk(hw);
+
+	switch (rate) {
+	case 44100:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_44k1_pll_regs, num_dedicated_44k1_pll_regs,
+			PLL_RESET);
+		break;
+	case 88200:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_88k2_pll_regs, num_dedicated_88k2_pll_regs,
+			PLL_RESET);
+		break;
+	case 176400:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_176k4_pll_regs, num_dedicated_176k4_pll_regs,
+			PLL_RESET);
+		break;
+	case 48000:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_48k_pll_regs,	num_dedicated_48k_pll_regs,
+			PLL_RESET);
+		break;
+	case 96000:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_96k_pll_regs,	num_dedicated_96k_pll_regs,
+			PLL_RESET);
+		break;
+	case 192000:
+		ret = clk_hifiberry_dachd_write_pll_regs(drvdata->regmap,
+			dedicated_192k_pll_regs, num_dedicated_192k_pll_regs,
+			PLL_RESET);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	to_hifiberry_clk(hw)->rate = rate;
+
+	return ret;
+}
+
+const struct clk_ops clk_hifiberry_dachd_rate_ops = {
+	.recalc_rate = clk_hifiberry_dachd_recalc_rate,
+	.round_rate = clk_hifiberry_dachd_round_rate,
+	.set_rate = clk_hifiberry_dachd_set_rate,
+};
+
+static int clk_hifiberry_get_prop_values(struct device *dev,
+					char *prop_name,
+					struct reg_default *regs)
+{
+	int ret;
+	int i;
+	u8 tmp[2 * HIFIBERRY_PLL_MAX_REGISTER];
+
+	ret = of_property_read_variable_u8_array(dev->of_node, prop_name,
+			tmp, 0, 2 * HIFIBERRY_PLL_MAX_REGISTER);
+	if (ret < 0)
+		return ret;
+	if (ret & 1) {
+		dev_err(dev,
+			"%s <%s> -> #%i odd number of bytes for reg/val pairs!",
+			__func__,
+			prop_name,
+			ret);
+		return -EINVAL;
+	}
+	ret /= 2;
+	for (i = 0; i < ret; i++) {
+		regs[i].reg = (u32)tmp[2 * i];
+		regs[i].def = (u32)tmp[2 * i + 1];
+	}
+	return ret;
+}
+
+
+static int clk_hifiberry_dachd_dt_parse(struct device *dev)
+{
+	num_common_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"common_pll_regs", common_pll_regs);
+	num_dedicated_44k1_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"44k1_pll_regs", dedicated_44k1_pll_regs);
+	num_dedicated_88k2_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"88k2_pll_regs", dedicated_88k2_pll_regs);
+	num_dedicated_176k4_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"176k4_pll_regs", dedicated_176k4_pll_regs);
+	num_dedicated_48k_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"48k_pll_regs", dedicated_48k_pll_regs);
+	num_dedicated_96k_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"96k_pll_regs", dedicated_96k_pll_regs);
+	num_dedicated_192k_pll_regs = clk_hifiberry_get_prop_values(dev,
+				"192k_pll_regs", dedicated_192k_pll_regs);
+	return 0;
+}
+
+
+static int clk_hifiberry_dachd_remove(struct device *dev)
+{
+	of_clk_del_provider(dev->of_node);
+	return 0;
+}
+
+const struct regmap_config hifiberry_pll_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = HIFIBERRY_PLL_MAX_REGISTER,
+	.reg_defaults = hifiberry_pll_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(hifiberry_pll_reg_defaults),
+	.cache_type = REGCACHE_RBTREE,
+};
+EXPORT_SYMBOL_GPL(hifiberry_pll_regmap);
+
+
+static int clk_hifiberry_dachd_i2c_probe(struct i2c_client *i2c,
+			     const struct i2c_device_id *id)
+{
+	struct clk_hifiberry_drvdata *hdclk;
+	int ret = 0;
+	struct clk_init_data init;
+	struct device *dev = &i2c->dev;
+	struct device_node *dev_node = dev->of_node;
+	struct regmap_config config = hifiberry_pll_regmap;
+
+	hdclk = devm_kzalloc(&i2c->dev,
+			sizeof(struct clk_hifiberry_drvdata), GFP_KERNEL);
+	if (!hdclk)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, hdclk);
+
+	hdclk->regmap = devm_regmap_init_i2c(i2c, &config);
+
+	if (IS_ERR(hdclk->regmap))
+		return PTR_ERR(hdclk->regmap);
+
+	/* start PLL to allow detection of DAC */
+	ret = clk_hifiberry_dachd_write_pll_regs(hdclk->regmap,
+				hifiberry_pll_reg_defaults,
+				ARRAY_SIZE(hifiberry_pll_reg_defaults),
+				PLL_RESET);
+	if (ret)
+		return ret;
+
+	clk_hifiberry_dachd_dt_parse(dev);
+
+	/* restart PLL with configs from DTB */
+	ret = clk_hifiberry_dachd_write_pll_regs(hdclk->regmap, common_pll_regs,
+					num_common_pll_regs, PLL_RESET);
+	if (ret)
+		return ret;
+
+	init.name = "clk-hifiberry-dachd";
+	init.ops = &clk_hifiberry_dachd_rate_ops;
+	init.flags = CLK_IS_BASIC;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+
+	hdclk->hw.init = &init;
+
+	hdclk->clk = devm_clk_register(dev, &hdclk->hw);
+	if (IS_ERR(hdclk->clk)) {
+		dev_err(dev, "unable to register %s\n",	init.name);
+		return PTR_ERR(hdclk->clk);
+	}
+
+	ret = of_clk_add_provider(dev_node, of_clk_src_simple_get, hdclk->clk);
+	if (ret != 0) {
+		dev_err(dev, "Cannot of_clk_add_provider");
+		return ret;
+	}
+
+	ret = clk_set_rate(hdclk->hw.clk, DEFAULT_RATE);
+	if (ret != 0) {
+		dev_err(dev, "Cannot set rate : %d\n",	ret);
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int clk_hifiberry_dachd_i2c_remove(struct i2c_client *i2c)
+{
+	clk_hifiberry_dachd_remove(&i2c->dev);
+	return 0;
+}
+
+static const struct i2c_device_id clk_hifiberry_dachd_i2c_id[] = {
+	{ "dachd-clk", },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, clk_hifiberry_dachd_i2c_id);
+
+static const struct of_device_id clk_hifiberry_dachd_of_match[] = {
+	{ .compatible = "hifiberry,dachd-clk", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, clk_hifiberry_dachd_of_match);
+
+static struct i2c_driver clk_hifiberry_dachd_i2c_driver = {
+	.probe		= clk_hifiberry_dachd_i2c_probe,
+	.remove		= clk_hifiberry_dachd_i2c_remove,
+	.id_table	= clk_hifiberry_dachd_i2c_id,
+	.driver		= {
+		.name	= "dachd-clk",
+		.of_match_table = of_match_ptr(clk_hifiberry_dachd_of_match),
+	},
+};
+
+module_i2c_driver(clk_hifiberry_dachd_i2c_driver);
+
+
+MODULE_DESCRIPTION("HiFiBerry DAC+ HD clock driver");
+MODULE_AUTHOR("Joerg Schambacher <joerg@i2audio.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:clk-hifiberry-dachd");
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -40,6 +40,13 @@ config SND_BCM2708_SOC_HIFIBERRY_DACPLUS
         help
          Say Y or M if you want to add support for HifiBerry DAC+.
 
+config SND_BCM2708_SOC_HIFIBERRY_DACPLUSHD
+        tristate "Support for HifiBerry DAC+ HD"
+        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+        select SND_SOC_PCM179X_I2C
+        help
+         Say Y or M if you want to add support for HifiBerry DAC+ HD.
+
 config SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC
         tristate "Support for HifiBerry DAC+ADC"
         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -13,6 +13,7 @@ snd-soc-googlevoicehat-codec-objs := goo
 
 # BCM2708 Machine Support
 snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
+snd-soc-hifiberry-dacplushd-objs := hifiberry_dacplushd.o
 snd-soc-hifiberry-dacplusadc-objs := hifiberry_dacplusadc.o
 snd-soc-hifiberry-dacplusadcpro-objs := hifiberry_dacplusadcpro.o
 snd-soc-hifiberry-dacplusdsp-objs := hifiberry_dacplusdsp.o
@@ -40,6 +41,7 @@ snd-soc-rpi-wm8804-soundcard-objs := rpi
 
 obj-$(CONFIG_SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD)  += snd-soc-googlevoicehat-codec.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSHD) += snd-soc-hifiberry-dacplushd.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC) += snd-soc-hifiberry-dacplusadc.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSADCPRO) += snd-soc-hifiberry-dacplusadcpro.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSDSP) += snd-soc-hifiberry-dacplusdsp.o
--- /dev/null
+++ b/sound/soc/bcm/hifiberry_dacplushd.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ASoC Driver for HiFiBerry DAC+ HD
+ *
+ * Author:	Joerg Schambacher, i2Audio GmbH for HiFiBerry
+ *		Copyright 2020
+ *
+ * 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 <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+
+#include "../codecs/pcm179x.h"
+
+#define DEFAULT_RATE		44100
+
+struct brd_drv_data {
+	struct regmap *regmap;
+	struct clk *sclk;
+};
+
+static struct brd_drv_data drvdata;
+static struct gpio_desc *reset_gpio;
+static const unsigned int hb_dacplushd_rates[] = {
+	192000, 96000, 48000, 176400, 88200, 44100,
+};
+
+static struct snd_pcm_hw_constraint_list hb_dacplushd_constraints = {
+	.list = hb_dacplushd_rates,
+	.count = ARRAY_SIZE(hb_dacplushd_rates),
+};
+
+static int snd_rpi_hb_dacplushd_startup(struct snd_pcm_substream *substream)
+{
+	/* constraints for standard sample rates */
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+				SNDRV_PCM_HW_PARAM_RATE,
+				&hb_dacplushd_constraints);
+	return 0;
+}
+
+static void snd_rpi_hifiberry_dacplushd_set_sclk(
+		struct snd_soc_component *component,
+		int sample_rate)
+{
+	if (!IS_ERR(drvdata.sclk))
+		clk_set_rate(drvdata.sclk, sample_rate);
+}
+
+static int snd_rpi_hifiberry_dacplushd_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai_link *dai = rtd->dai_link;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	dai->name = "HiFiBerry DAC+ HD";
+	dai->stream_name = "HiFiBerry DAC+ HD HiFi";
+	dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
+		| SND_SOC_DAIFMT_CBM_CFM;
+
+	/* allow only fixed 32 clock counts per channel */
+	snd_soc_dai_set_bclk_ratio(cpu_dai, 32*2);
+
+	return 0;
+}
+
+static int snd_rpi_hifiberry_dacplushd_hw_params(
+	struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+	struct snd_soc_component *component = rtd->codec_dai->component;
+
+	snd_rpi_hifiberry_dacplushd_set_sclk(component, params_rate(params));
+	return ret;
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_hifiberry_dacplushd_ops = {
+	.startup = snd_rpi_hb_dacplushd_startup,
+	.hw_params = snd_rpi_hifiberry_dacplushd_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_hifiberry_dacplushd_dai[] = {
+{
+	.name		= "HiFiBerry DAC+ HD",
+	.stream_name	= "HiFiBerry DAC+ HD HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm179x-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm179x.1-004c",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_hifiberry_dacplushd_ops,
+	.init		= snd_rpi_hifiberry_dacplushd_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_hifiberry_dacplushd = {
+	.name         = "snd_rpi_hifiberry_dacplushd",
+	.driver_name  = "HifiberryDacplusHD",
+	.owner        = THIS_MODULE,
+	.dai_link     = snd_rpi_hifiberry_dacplushd_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dacplushd_dai),
+};
+
+static int snd_rpi_hifiberry_dacplushd_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	static int dac_reset_done;
+	struct device *dev = &pdev->dev;
+	struct device_node *dev_node = dev->of_node;
+
+	snd_rpi_hifiberry_dacplushd.dev = &pdev->dev;
+
+	/* get GPIO and release DAC from RESET */
+	if (!dac_reset_done) {
+		reset_gpio = gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
+		if (IS_ERR(reset_gpio)) {
+			dev_err(&pdev->dev, "gpiod_get() failed\n");
+			return -EINVAL;
+		}
+		dac_reset_done = 1;
+	}
+	if (!IS_ERR(reset_gpio))
+		gpiod_set_value(reset_gpio, 0);
+	msleep(1);
+	if (!IS_ERR(reset_gpio))
+		gpiod_set_value(reset_gpio, 1);
+	msleep(1);
+	if (!IS_ERR(reset_gpio))
+		gpiod_set_value(reset_gpio, 0);
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai;
+
+		dai = &snd_rpi_hifiberry_dacplushd_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;
+		} else {
+			return -EPROBE_DEFER;
+		}
+
+	}
+
+	ret = devm_snd_soc_register_card(&pdev->dev,
+			&snd_rpi_hifiberry_dacplushd);
+	if (ret && ret != -EPROBE_DEFER) {
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+		return ret;
+	}
+	if (ret == -EPROBE_DEFER)
+		return ret;
+
+	dev_set_drvdata(dev, &drvdata);
+	if (dev_node == NULL) {
+		dev_err(&pdev->dev, "Device tree node not found\n");
+		return -ENODEV;
+	}
+
+	drvdata.sclk = devm_clk_get(dev, NULL);
+	if (IS_ERR(drvdata.sclk)) {
+		drvdata.sclk = ERR_PTR(-ENOENT);
+		return -ENODEV;
+	}
+
+	clk_set_rate(drvdata.sclk, DEFAULT_RATE);
+
+	return ret;
+}
+
+static int snd_rpi_hifiberry_dacplushd_remove(struct platform_device *pdev)
+{
+	if (IS_ERR(reset_gpio))
+		return -EINVAL;
+
+	/* put DAC into RESET and release GPIO */
+	gpiod_set_value(reset_gpio, 0);
+	gpiod_put(reset_gpio);
+
+	return 0;
+}
+
+static const struct of_device_id snd_rpi_hifiberry_dacplushd_of_match[] = {
+	{ .compatible = "hifiberry,hifiberry-dacplushd", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dacplushd_of_match);
+
+static struct platform_driver snd_rpi_hifiberry_dacplushd_driver = {
+	.driver = {
+		.name   = "snd-rpi-hifiberry-dacplushd",
+		.owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_hifiberry_dacplushd_of_match,
+	},
+	.probe          = snd_rpi_hifiberry_dacplushd_probe,
+	.remove		= snd_rpi_hifiberry_dacplushd_remove,
+};
+
+module_platform_driver(snd_rpi_hifiberry_dacplushd_driver);
+
+MODULE_AUTHOR("Joerg Schambacher <joerg@i2audio.com>");
+MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+ HD");
+MODULE_LICENSE("GPL v2");