openwrt/target/linux/bcm27xx/patches-5.10/950-0723-ASoC-bcm-Add-chipdip-dac-driver.patch

From e17c3e2ccb04657ca00984477854a6a700fef01d Mon Sep 17 00:00:00 2001
From: "chipdip.lab" <43340836+chipdipru@users.noreply.github.com>
Date: Mon, 26 Jul 2021 14:45:59 +0300
Subject: [PATCH] ASoC: bcm: Add chipdip-dac driver

Driver chipdip-dac.c added into sound/soc/bcm/, files
sound/soc/bcm/Kconfig and sound/soc/bcm/Makefile updated.

Signed-off-by: Evgenij Sapunov <evgenij.sapunov@chipdip.ru>
---
 sound/soc/bcm/Kconfig       |   6 +
 sound/soc/bcm/Makefile      |   3 +-
 sound/soc/bcm/chipdip-dac.c | 275 ++++++++++++++++++++++++++++++++++++
 3 files changed, 283 insertions(+), 1 deletion(-)
 create mode 100644 sound/soc/bcm/chipdip-dac.c

--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -27,6 +27,12 @@ config SND_BCM63XX_I2S_WHISTLER
 
 	  If you don't know what to do here, say N
 
+config SND_BCM2708_SOC_CHIPDIP_DAC
+         tristate "Support for the ChipDip DAC"
+         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+         help
+          Say Y or M if you want to add support for the ChipDip DAC soundcard
+
 config SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD
 	tristate "Support for Google voiceHAT soundcard"
 	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -47,6 +47,7 @@ snd-soc-fe-pi-audio-objs := fe-pi-audio.
 snd-soc-rpi-simple-soundcard-objs := rpi-simple-soundcard.o
 snd-soc-rpi-wm8804-soundcard-objs := rpi-wm8804-soundcard.o
 snd-soc-pifi-40-objs := pifi-40.o
+snd-soc-chipdip-dac-objs := chipdip-dac.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD)  += snd-soc-googlevoicehat-codec.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
@@ -78,4 +79,4 @@ obj-$(CONFIG_SND_BCM2708_SOC_FE_PI_AUDIO
 obj-$(CONFIG_SND_RPI_SIMPLE_SOUNDCARD) += snd-soc-rpi-simple-soundcard.o
 obj-$(CONFIG_SND_RPI_WM8804_SOUNDCARD) += snd-soc-rpi-wm8804-soundcard.o
 obj-$(CONFIG_SND_BCM2708_SOC_PIFI_40) += snd-soc-pifi-40.o
-
+obj-$(CONFIG_SND_BCM2708_SOC_CHIPDIP_DAC) += snd-soc-chipdip-dac.o
--- /dev/null
+++ b/sound/soc/bcm/chipdip-dac.c
@@ -0,0 +1,275 @@
+/*
+ * ASoC Driver for ChipDip DAC
+ *
+ * Author:	Evgenij Sapunov
+ *		Copyright 2021
+ *		based on code by Milan Neskovic <info@justboom.co>
+ *		based on code by Jaikumar <jaikumar@cem-solutions.net>
+ *
+ * Thanks to Phil Elwell (pelwell) for help.
+ *
+ * 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/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#define SR_BIT_0                  0 //sample rate bits
+#define SR_BIT_1                  1
+#define SR_BIT_2                  2
+#define BD_BIT_0                  3 //bit depth bits
+#define BD_BIT_1                  4
+
+#define SAMPLE_RATE_MASK_44_1     0
+#define SAMPLE_RATE_MASK_48       (1 << SR_BIT_0)
+#define SAMPLE_RATE_MASK_88_2     ((1 << SR_BIT_2) | (1 << SR_BIT_1))
+#define SAMPLE_RATE_MASK_96       (1 << SR_BIT_1)
+#define SAMPLE_RATE_MASK_176_4    ((1 << SR_BIT_2) | (1 << SR_BIT_1) | (1 << SR_BIT_0))
+#define SAMPLE_RATE_MASK_192      ((1 << SR_BIT_1) | (1 << SR_BIT_0))
+#define SAMPLE_RATE_MASK          ((1 << SR_BIT_2) | (1 << SR_BIT_1) | (1 << SR_BIT_0))
+
+#define BIT_DEPTH_MASK_16         0
+#define BIT_DEPTH_MASK_24         (1 << BD_BIT_0)
+#define BIT_DEPTH_MASK_32         (1 << BD_BIT_1)
+#define BIT_DEPTH_MASK            ((1 << BD_BIT_1) | (1 << BD_BIT_0))
+
+#define MUTE_ACTIVE               0
+#define MUTE_NOT_ACTIVE           1
+
+#define HW_PARAMS_GPIO_COUNT      5
+
+static struct gpio_desc *mute_gpio;
+static struct gpio_desc *sdwn_gpio;
+static struct gpio_desc *hw_params_gpios[HW_PARAMS_GPIO_COUNT];
+static int current_width;
+static int current_rate;
+
+static void snd_rpi_chipdip_dac_gpio_array_set(int value);
+static void snd_rpi_chipdip_dac_gpio_set(struct gpio_desc *gpio_item, int value);
+
+static void snd_rpi_chipdip_dac_gpio_array_set(int value)
+{
+	int i = 0;
+
+	for (i = 0; i < HW_PARAMS_GPIO_COUNT; i++)
+		snd_rpi_chipdip_dac_gpio_set(hw_params_gpios[i], ((value >> i) & 1));
+}
+
+static void snd_rpi_chipdip_dac_gpio_set(struct gpio_desc *gpio_item, int value)
+{
+	if (gpio_item)
+		gpiod_set_value_cansleep(gpio_item, value);
+}
+
+static int snd_rpi_chipdip_dac_init(struct snd_soc_pcm_runtime *rtd)
+{
+	return 0;
+}
+
+static int snd_rpi_chipdip_dac_hw_params(struct snd_pcm_substream *substream,
+					 struct snd_pcm_hw_params *params)
+{
+	int ret = 0;
+	int gpio_change_pending = 0;
+	int sample_rate_state = 0;
+	int bit_depth_state = 0;
+	int param_value = params_width(params);
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+	ret = snd_soc_dai_set_bclk_ratio(asoc_rtd_to_cpu(rtd, 0), 2 * 32);
+
+	if (current_width != param_value) {
+		current_width = param_value;
+		gpio_change_pending = 1;
+
+		switch (param_value) {
+		case 16:
+			bit_depth_state = BIT_DEPTH_MASK_16;
+			break;
+		case 24:
+			bit_depth_state = BIT_DEPTH_MASK_24;
+			break;
+		case 32:
+			bit_depth_state = BIT_DEPTH_MASK_32;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	param_value = params_rate(params);
+	if (current_rate != param_value) {
+		current_rate = param_value;
+		gpio_change_pending = 1;
+
+		switch (param_value) {
+		case 44100:
+			sample_rate_state = SAMPLE_RATE_MASK_44_1;
+			break;
+		case 48000:
+			sample_rate_state = SAMPLE_RATE_MASK_48;
+			break;
+		case 88200:
+			sample_rate_state = SAMPLE_RATE_MASK_88_2;
+			break;
+		case 96000:
+			sample_rate_state = SAMPLE_RATE_MASK_96;
+			break;
+		case 176400:
+			sample_rate_state = SAMPLE_RATE_MASK_176_4;
+			break;
+		case 192000:
+			sample_rate_state = SAMPLE_RATE_MASK_192;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	if (gpio_change_pending) {
+		snd_rpi_chipdip_dac_gpio_set(mute_gpio, MUTE_ACTIVE);
+		snd_rpi_chipdip_dac_gpio_array_set(bit_depth_state | sample_rate_state);
+		msleep(300);
+		snd_rpi_chipdip_dac_gpio_set(mute_gpio, MUTE_NOT_ACTIVE);
+	}
+
+	return ret;
+}
+
+static int snd_rpi_chipdip_dac_startup(struct snd_pcm_substream *substream)
+{
+	return 0;
+}
+
+static void snd_rpi_chipdip_dac_shutdown(struct snd_pcm_substream *substream)
+{
+
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_chipdip_dac_ops = {
+	.hw_params = snd_rpi_chipdip_dac_hw_params,
+	.startup = snd_rpi_chipdip_dac_startup,
+	.shutdown = snd_rpi_chipdip_dac_shutdown,
+};
+
+SND_SOC_DAILINK_DEFS(hifi,
+	DAILINK_COMP_ARRAY(COMP_CPU("bcm2708-i2s.0")),
+	DAILINK_COMP_ARRAY(COMP_CODEC("spdif-transmitter", "dit-hifi")),
+	DAILINK_COMP_ARRAY(COMP_PLATFORM("bcm2708-i2s.0")));
+
+static struct snd_soc_dai_link snd_rpi_chipdip_dac_dai[] = {
+{
+	.name		= "ChipDip DAC",
+	.stream_name	= "ChipDip DAC HiFi",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBM_CFM,
+	.ops		= &snd_rpi_chipdip_dac_ops,
+	.init		= snd_rpi_chipdip_dac_init,
+	SND_SOC_DAILINK_REG(hifi),
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_chipdip_dac = {
+	.name         = "ChipDipDAC",
+	.driver_name  = "ChipdipDac",
+	.owner        = THIS_MODULE,
+	.dai_link     = snd_rpi_chipdip_dac_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_chipdip_dac_dai),
+};
+
+static int snd_rpi_chipdip_dac_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	int i = 0;
+
+	snd_rpi_chipdip_dac.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai = &snd_rpi_chipdip_dac_dai[0];
+		i2s_node = of_parse_phandle(pdev->dev.of_node,
+					"i2s-controller", 0);
+
+		if (i2s_node) {
+			dai->cpus->dai_name = NULL;
+			dai->cpus->of_node = i2s_node;
+			dai->platforms->name = NULL;
+			dai->platforms->of_node = i2s_node;
+		}
+	}
+
+	hw_params_gpios[SR_BIT_0] = devm_gpiod_get_optional(&pdev->dev, "sr0", GPIOD_OUT_LOW);
+	hw_params_gpios[SR_BIT_1] = devm_gpiod_get_optional(&pdev->dev, "sr1", GPIOD_OUT_LOW);
+	hw_params_gpios[SR_BIT_2] = devm_gpiod_get_optional(&pdev->dev, "sr2", GPIOD_OUT_LOW);
+	hw_params_gpios[BD_BIT_0] = devm_gpiod_get_optional(&pdev->dev, "res0", GPIOD_OUT_LOW);
+	hw_params_gpios[BD_BIT_1] = devm_gpiod_get_optional(&pdev->dev, "res1", GPIOD_OUT_LOW);
+	mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute", GPIOD_OUT_LOW);
+	sdwn_gpio = devm_gpiod_get_optional(&pdev->dev, "sdwn", GPIOD_OUT_HIGH);
+
+	for (i = 0; i < HW_PARAMS_GPIO_COUNT; i++) {
+		if (IS_ERR(hw_params_gpios[i])) {
+			ret = PTR_ERR(hw_params_gpios[i]);
+			dev_err(&pdev->dev, "failed to get hw_params gpio: %d\n", ret);
+			return ret;
+		}
+	}
+
+	if (IS_ERR(mute_gpio)) {
+		ret = PTR_ERR(mute_gpio);
+		dev_err(&pdev->dev, "failed to get mute gpio: %d\n", ret);
+		return ret;
+	}
+
+	if (IS_ERR(sdwn_gpio)) {
+		ret = PTR_ERR(sdwn_gpio);
+		dev_err(&pdev->dev, "failed to get sdwn gpio: %d\n", ret);
+		return ret;
+	}
+
+	snd_rpi_chipdip_dac_gpio_set(sdwn_gpio, 1);
+
+	ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_chipdip_dac);
+	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_chipdip_dac_of_match[] = {
+	{ .compatible = "chipdip,chipdip-dac", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_chipdip_dac_of_match);
+
+static struct platform_driver snd_rpi_chipdip_dac_driver = {
+	.driver = {
+		.name   = "snd-rpi-chipdip-dac",
+		.owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_chipdip_dac_of_match,
+	},
+	.probe          = snd_rpi_chipdip_dac_probe,
+};
+
+module_platform_driver(snd_rpi_chipdip_dac_driver);
+
+MODULE_AUTHOR("Evgenij Sapunov <evgenij.sapunov@chipdip.ru>");
+MODULE_DESCRIPTION("ASoC Driver for ChipDip DAC");
+MODULE_LICENSE("GPL v2");