initial commit

7 files changed, 1160 insertions, 0 deletions

diff --git a/.SRCINFO b/.SRCINFO
new file mode 100644
index 000000000000..4386188e03d4
--- /dev/null
+++ b/.SRCINFO
@@ -0,0 +1,18 @@
+pkgbase = goodix-p2max-dkms
+	pkgdesc = Goodix touchscreen driver hack for GPD P2 Max
+	pkgver = 20190917
+	pkgrel = 1
+	url = https://github.com/PeterCxy
+	install = goodix-p2max-dkms.install
+	arch = any
+	license = GPL2
+	depends = dkms
+	source = goodix.c
+	source = dkms.conf
+	source = Makefile
+	md5sums = 8e926b1baf8f7f367cebce2c8e883357
+	md5sums = 6aec7e75f05eef67ec7cf41f23fdef7d
+	md5sums = d33b0aa9a29b5f5b811e4869ee40e245
+
+pkgname = goodix-p2max-dkms
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000000..65e1fc6a50b0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.xz
diff --git a/Makefile b/Makefile
new file mode 100644
index 000000000000..8a9cea6e2ca4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,21 @@
+DRIVER_NAME := goodix
+KERNEL_SOURCE_DIR ?= /lib/modules/`uname -r`/build
+
+EXTRA_CFLAGS +=
+
+obj-m := $(DRIVER_NAME).o
+
+#DRIVER_FILES := goodix.o
+
+#$(DRIVER_NAME)-objs:= $(DRIVER_FILES)
+
+modules:
+	$(MAKE) -C $(KERNEL_SOURCE_DIR) KCPPFLAGS="$(EXTRA_CFLAGS)" M=$(PWD) modules
+
+modules_install:
+	$(MAKE) -C $(KERNEL_SOURCE_DIR) M=$(PWD) modules_install
+
+install: modules_install
+
+clean:
+	$(MAKE) -C $(KERNEL_SOURCE_DIR) M=$(PWD) clean
diff --git a/PKGBUILD b/PKGBUILD
new file mode 100644
index 000000000000..b34ddae88185
--- /dev/null
+++ b/PKGBUILD
@@ -0,0 +1,31 @@
+# Maintainer: <peter at typeblog dot net>
+
+_base=goodix
+_pkgbase=${_base}-p2max
+pkgname=${_pkgbase}-dkms
+pkgver=20190917
+pkgrel=1
+pkgdesc="Goodix touchscreen driver hack for GPD P2 Max"
+arch=('any')
+license=('GPL2')
+url="https://github.com/PeterCxy"
+depends=('dkms')
+install=${pkgname}.install
+source=(
+  "goodix.c"
+  "dkms.conf"
+  "Makefile"
+)
+md5sums=('8e926b1baf8f7f367cebce2c8e883357'
+         '6aec7e75f05eef67ec7cf41f23fdef7d'
+         'd33b0aa9a29b5f5b811e4869ee40e245')
+
+package() {
+  cd "$srcdir"
+  local install_dir="${pkgdir}/usr/src/${_pkgbase}-${pkgver}"
+  install -Dm644 dkms.conf "${install_dir}/dkms.conf"
+  install -Dm644 goodix.c "${install_dir}/goodix.c"
+  install -Dm644 Makefile "${install_dir}/Makefile"
+
+}
+
diff --git a/dkms.conf b/dkms.conf
new file mode 100644
index 000000000000..b82e2b0eb5d8
--- /dev/null
+++ b/dkms.conf
@@ -0,0 +1,7 @@
+PACKAGE_NAME="goodix-p2max"
+PACKAGE_VERSION="20190917"
+MAKE[0]="KERNEL_SOURCE_DIR=/usr/lib/modules/$kernelver/build make modules"
+CLEAN="make clean"
+BUILT_MODULE_NAME[0]="goodix"
+DEST_MODULE_LOCATION[0]="/kernel/drivers/input/touchscreen"
+AUTOINSTALL="yes"
diff --git a/goodix-p2max-dkms.install b/goodix-p2max-dkms.install
new file mode 100644
index 000000000000..ae763d384942
--- /dev/null
+++ b/goodix-p2max-dkms.install
@@ -0,0 +1,15 @@
+post_install() {
+	dkms install goodix-p2max/${1%%-*}
+}
+
+pre_upgrade() {
+	pre_remove ${2%%-*}
+}
+
+post_upgrade() {
+	post_install ${1%%-*}
+}
+
+pre_remove() {
+	dkms remove goodix-p2max/${1%%-*} --all
+}
diff --git a/goodix.c b/goodix.c
new file mode 100644
index 000000000000..67e0f15d2994
--- /dev/null
+++ b/goodix.c
@@ -0,0 +1,1067 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Driver for Goodix Touchscreens
+ *
+ *  Copyright (c) 2014 Red Hat Inc.
+ *  Copyright (c) 2015 K. Merker <merker@debian.org>
+ *
+ *  This code is based on gt9xx.c authored by andrew@goodix.com:
+ *
+ *  2010 - 2012 Goodix Technology.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/dmi.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/of.h>
+#include <asm/unaligned.h>
+
+struct goodix_ts_data;
+
+struct goodix_chip_data {
+	u16 config_addr;
+	int config_len;
+	int (*check_config)(struct goodix_ts_data *, const struct firmware *);
+};
+
+struct goodix_ts_data {
+	struct i2c_client *client;
+	struct input_dev *input_dev;
+	const struct goodix_chip_data *chip;
+	struct touchscreen_properties prop;
+	unsigned int max_touch_num;
+	unsigned int int_trigger_type;
+	struct regulator *avdd28;
+	struct regulator *vddio;
+	struct gpio_desc *gpiod_int;
+	struct gpio_desc *gpiod_rst;
+	u16 id;
+	u16 version;
+	const char *cfg_name;
+	struct completion firmware_loading_complete;
+	unsigned long irq_flags;
+};
+
+#define GOODIX_GPIO_INT_NAME		"irq"
+#define GOODIX_GPIO_RST_NAME		"reset"
+
+#define GOODIX_MAX_HEIGHT		4096
+#define GOODIX_MAX_WIDTH		4096
+#define GOODIX_INT_TRIGGER		1
+#define GOODIX_CONTACT_SIZE		8
+#define GOODIX_MAX_CONTACTS		10
+
+#define GOODIX_CONFIG_MAX_LENGTH	240
+#define GOODIX_CONFIG_911_LENGTH	186
+#define GOODIX_CONFIG_967_LENGTH	228
+
+/* Register defines */
+#define GOODIX_REG_COMMAND		0x8040
+#define GOODIX_CMD_SCREEN_OFF		0x05
+
+#define GOODIX_READ_COOR_ADDR		0x814E
+#define GOODIX_GT1X_REG_CONFIG_DATA	0x8050
+#define GOODIX_GT9X_REG_CONFIG_DATA	0x8047
+#define GOODIX_REG_ID			0x8140
+
+#define GOODIX_BUFFER_STATUS_READY	BIT(7)
+#define GOODIX_BUFFER_STATUS_TIMEOUT	20
+
+#define RESOLUTION_LOC		1
+#define MAX_CONTACTS_LOC	5
+#define TRIGGER_LOC		6
+
+static int goodix_check_cfg_8(struct goodix_ts_data *ts,
+			const struct firmware *cfg);
+static int goodix_check_cfg_16(struct goodix_ts_data *ts,
+			const struct firmware *cfg);
+
+static const struct goodix_chip_data gt1x_chip_data = {
+	.config_addr		= GOODIX_GT1X_REG_CONFIG_DATA,
+	.config_len		= GOODIX_CONFIG_MAX_LENGTH,
+	.check_config		= goodix_check_cfg_16,
+};
+
+static const struct goodix_chip_data gt911_chip_data = {
+	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
+	.config_len		= GOODIX_CONFIG_911_LENGTH,
+	.check_config		= goodix_check_cfg_8,
+};
+
+static const struct goodix_chip_data gt967_chip_data = {
+	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
+	.config_len		= GOODIX_CONFIG_967_LENGTH,
+	.check_config		= goodix_check_cfg_8,
+};
+
+static const struct goodix_chip_data gt9x_chip_data = {
+	.config_addr		= GOODIX_GT9X_REG_CONFIG_DATA,
+	.config_len		= GOODIX_CONFIG_MAX_LENGTH,
+	.check_config		= goodix_check_cfg_8,
+};
+
+static const unsigned long goodix_irq_flags[] = {
+	IRQ_TYPE_EDGE_RISING,
+	IRQ_TYPE_EDGE_FALLING,
+	IRQ_TYPE_LEVEL_LOW,
+	IRQ_TYPE_LEVEL_HIGH,
+};
+
+/*
+ * Those tablets have their coordinates origin at the bottom right
+ * of the tablet, as if rotated 180 degrees
+ */
+static const struct dmi_system_id rotated_screen[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+	{
+		.ident = "WinBook TW100",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
+		}
+	},
+	{
+		.ident = "WinBook TW700",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
+		},
+	},
+#endif
+	{}
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_gpio_params irq_gpios_active_high = { 0, 0, false };
+static const struct acpi_gpio_params reset_gpios_active_high = { 1, 0, false };
+static const struct acpi_gpio_mapping gpio_mapping_order_normal_irq_active_high[] = {
+	{ "irq-gpios", &irq_gpios_active_high, 1 },
+	{ "reset-gpios", &reset_gpios_active_high, 1 },
+	{}
+};
+
+/*
+ * Devices that need acpi_gpio_mapping to function correctly
+ */
+static const struct dmi_system_id need_gpio_mapping[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+	{
+		.ident = "GPD P2 Max",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "P2 MAX")
+		},
+		.driver_data = &gpio_mapping_order_normal_irq_active_high
+	},
+#endif
+	{}
+};
+#endif
+
+/**
+ * goodix_i2c_read - read data from a register of the i2c slave device.
+ *
+ * @client: i2c device.
+ * @reg: the register to read from.
+ * @buf: raw write data buffer.
+ * @len: length of the buffer to write
+ */
+static int goodix_i2c_read(struct i2c_client *client,
+			   u16 reg, u8 *buf, int len)
+{
+	struct i2c_msg msgs[2];
+	__be16 wbuf = cpu_to_be16(reg);
+	int ret;
+
+	msgs[0].flags = 0;
+	msgs[0].addr  = client->addr;
+	msgs[0].len   = 2;
+	msgs[0].buf   = (u8 *)&wbuf;
+
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].addr  = client->addr;
+	msgs[1].len   = len;
+	msgs[1].buf   = buf;
+
+	ret = i2c_transfer(client->adapter, msgs, 2);
+	return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
+}
+
+/**
+ * goodix_i2c_write - write data to a register of the i2c slave device.
+ *
+ * @client: i2c device.
+ * @reg: the register to write to.
+ * @buf: raw data buffer to write.
+ * @len: length of the buffer to write
+ */
+static int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf,
+			    unsigned len)
+{
+	u8 *addr_buf;
+	struct i2c_msg msg;
+	int ret;
+
+	addr_buf = kmalloc(len + 2, GFP_KERNEL);
+	if (!addr_buf)
+		return -ENOMEM;
+
+	addr_buf[0] = reg >> 8;
+	addr_buf[1] = reg & 0xFF;
+	memcpy(&addr_buf[2], buf, len);
+
+	msg.flags = 0;
+	msg.addr = client->addr;
+	msg.buf = addr_buf;
+	msg.len = len + 2;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	kfree(addr_buf);
+	return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
+}
+
+static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
+{
+	return goodix_i2c_write(client, reg, &value, sizeof(value));
+}
+
+static const struct goodix_chip_data *goodix_get_chip_data(u16 id)
+{
+	switch (id) {
+	case 1151:
+	case 5663:
+	case 5688:
+		return &gt1x_chip_data;
+
+	case 911:
+	case 9271:
+	case 9110:
+	case 927:
+	case 928:
+		return &gt911_chip_data;
+
+	case 912:
+	case 967:
+		return &gt967_chip_data;
+
+	default:
+		return &gt9x_chip_data;
+	}
+}
+
+static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
+{
+	unsigned long max_timeout;
+	int touch_num;
+	int error;
+
+	/*
+	 * The 'buffer status' bit, which indicates that the data is valid, is
+	 * not set as soon as the interrupt is raised, but slightly after.
+	 * This takes around 10 ms to happen, so we poll for 20 ms.
+	 */
+	max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
+	do {
+		error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR,
+					data, GOODIX_CONTACT_SIZE + 1);
+		if (error) {
+			dev_err(&ts->client->dev, "I2C transfer error: %d\n",
+					error);
+			return error;
+		}
+
+		if (data[0] & GOODIX_BUFFER_STATUS_READY) {
+			touch_num = data[0] & 0x0f;
+			if (touch_num > ts->max_touch_num)
+				return -EPROTO;
+
+			if (touch_num > 1) {
+				data += 1 + GOODIX_CONTACT_SIZE;
+				error = goodix_i2c_read(ts->client,
+						GOODIX_READ_COOR_ADDR +
+							1 + GOODIX_CONTACT_SIZE,
+						data,
+						GOODIX_CONTACT_SIZE *
+							(touch_num - 1));
+				if (error)
+					return error;
+			}
+
+			return touch_num;
+		}
+
+		usleep_range(1000, 2000); /* Poll every 1 - 2 ms */
+	} while (time_before(jiffies, max_timeout));
+
+	/*
+	 * The Goodix panel will send spurious interrupts after a
+	 * 'finger up' event, which will always cause a timeout.
+	 */
+	return 0;
+}
+
+static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
+{
+	int id = coor_data[0] & 0x0F;
+	int input_x = get_unaligned_le16(&coor_data[1]);
+	int input_y = get_unaligned_le16(&coor_data[3]);
+	int input_w = get_unaligned_le16(&coor_data[5]);
+
+	input_mt_slot(ts->input_dev, id);
+	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
+	touchscreen_report_pos(ts->input_dev, &ts->prop,
+			       input_x, input_y, true);
+	input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
+	input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
+}
+
+/**
+ * goodix_process_events - Process incoming events
+ *
+ * @ts: our goodix_ts_data pointer
+ *
+ * Called when the IRQ is triggered. Read the current device state, and push
+ * the input events to the user space.
+ */
+static void goodix_process_events(struct goodix_ts_data *ts)
+{
+	u8  point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
+	int touch_num;
+	int i;
+
+	touch_num = goodix_ts_read_input_report(ts, point_data);
+	if (touch_num < 0)
+		return;
+
+	/*
+	 * Bit 4 of the first byte reports the status of the capacitive
+	 * Windows/Home button.
+	 */
+	input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
+
+	for (i = 0; i < touch_num; i++)
+		goodix_ts_report_touch(ts,
+				&point_data[1 + GOODIX_CONTACT_SIZE * i]);
+
+	input_mt_sync_frame(ts->input_dev);
+	input_sync(ts->input_dev);
+}
+
+/**
+ * goodix_ts_irq_handler - The IRQ handler
+ *
+ * @irq: interrupt number.
+ * @dev_id: private data pointer.
+ */
+static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
+{
+	struct goodix_ts_data *ts = dev_id;
+
+	goodix_process_events(ts);
+
+	if (goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0) < 0)
+		dev_err(&ts->client->dev, "I2C write end_cmd error\n");
+
+	return IRQ_HANDLED;
+}
+
+static void goodix_free_irq(struct goodix_ts_data *ts)
+{
+	devm_free_irq(&ts->client->dev, ts->client->irq, ts);
+}
+
+static int goodix_request_irq(struct goodix_ts_data *ts)
+{
+	return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
+					 NULL, goodix_ts_irq_handler,
+					 ts->irq_flags, ts->client->name, ts);
+}
+
+static int goodix_check_cfg_8(struct goodix_ts_data *ts,
+			const struct firmware *cfg)
+{
+	int i, raw_cfg_len = cfg->size - 2;
+	u8 check_sum = 0;
+
+	for (i = 0; i < raw_cfg_len; i++)
+		check_sum += cfg->data[i];
+	check_sum = (~check_sum) + 1;
+	if (check_sum != cfg->data[raw_cfg_len]) {
+		dev_err(&ts->client->dev,
+			"The checksum of the config fw is not correct");
+		return -EINVAL;
+	}
+
+	if (cfg->data[raw_cfg_len + 1] != 1) {
+		dev_err(&ts->client->dev,
+			"Config fw must have Config_Fresh register set");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int goodix_check_cfg_16(struct goodix_ts_data *ts,
+			const struct firmware *cfg)
+{
+	int i, raw_cfg_len = cfg->size - 3;
+	u16 check_sum = 0;
+
+	for (i = 0; i < raw_cfg_len; i += 2)
+		check_sum += get_unaligned_be16(&cfg->data[i]);
+	check_sum = (~check_sum) + 1;
+	if (check_sum != get_unaligned_be16(&cfg->data[raw_cfg_len])) {
+		dev_err(&ts->client->dev,
+			"The checksum of the config fw is not correct");
+		return -EINVAL;
+	}
+
+	if (cfg->data[raw_cfg_len + 2] != 1) {
+		dev_err(&ts->client->dev,
+			"Config fw must have Config_Fresh register set");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ * goodix_check_cfg - Checks if config fw is valid
+ *
+ * @ts: goodix_ts_data pointer
+ * @cfg: firmware config data
+ */
+static int goodix_check_cfg(struct goodix_ts_data *ts,
+			    const struct firmware *cfg)
+{
+	if (cfg->size > GOODIX_CONFIG_MAX_LENGTH) {
+		dev_err(&ts->client->dev,
+			"The length of the config fw is not correct");
+		return -EINVAL;
+	}
+
+	return ts->chip->check_config(ts, cfg);
+}
+
+/**
+ * goodix_send_cfg - Write fw config to device
+ *
+ * @ts: goodix_ts_data pointer
+ * @cfg: config firmware to write to device
+ */
+static int goodix_send_cfg(struct goodix_ts_data *ts,
+			   const struct firmware *cfg)
+{
+	int error;
+
+	error = goodix_check_cfg(ts, cfg);
+	if (error)
+		return error;
+
+	error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg->data,
+				 cfg->size);
+	if (error) {
+		dev_err(&ts->client->dev, "Failed to write config data: %d",
+			error);
+		return error;
+	}
+	dev_dbg(&ts->client->dev, "Config sent successfully.");
+
+	/* Let the firmware reconfigure itself, so sleep for 10ms */
+	usleep_range(10000, 11000);
+
+	return 0;
+}
+
+static int goodix_int_sync(struct goodix_ts_data *ts)
+{
+	int error;
+
+	error = gpiod_direction_output(ts->gpiod_int, 0);
+	if (error)
+		return error;
+
+	msleep(50);				/* T5: 50ms */
+
+	error = gpiod_direction_input(ts->gpiod_int);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+/**
+ * goodix_reset - Reset device during power on
+ *
+ * @ts: goodix_ts_data pointer
+ */
+static int goodix_reset(struct goodix_ts_data *ts)
+{
+	int error;
+
+	/* begin select I2C slave addr */
+	error = gpiod_direction_output(ts->gpiod_rst, 0);
+	if (error)
+		return error;
+
+	msleep(20);				/* T2: > 10ms */
+
+	/* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */
+	error = gpiod_direction_output(ts->gpiod_int, ts->client->addr == 0x14);
+	if (error)
+		return error;
+
+	usleep_range(100, 2000);		/* T3: > 100us */
+
+	error = gpiod_direction_output(ts->gpiod_rst, 1);
+	if (error)
+		return error;
+
+	usleep_range(6000, 10000);		/* T4: > 5ms */
+
+	/* end select I2C slave addr */
+	error = gpiod_direction_input(ts->gpiod_rst);
+	if (error)
+		return error;
+
+	error = goodix_int_sync(ts);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+/**
+ * goodix_get_gpio_config - Get GPIO config from ACPI/DT
+ *
+ * @ts: goodix_ts_data pointer
+ */
+static int goodix_get_gpio_config(struct goodix_ts_data *ts)
+{
+	int error;
+	struct device *dev;
+	struct gpio_desc *gpiod;
+
+	if (!ts->client)
+		return -EINVAL;
+	dev = &ts->client->dev;
+
+	ts->avdd28 = devm_regulator_get(dev, "AVDD28");
+	if (IS_ERR(ts->avdd28)) {
+		error = PTR_ERR(ts->avdd28);
+		if (error != -EPROBE_DEFER)
+			dev_err(dev,
+				"Failed to get AVDD28 regulator: %d\n", error);
+		return error;
+	}
+
+	ts->vddio = devm_regulator_get(dev, "VDDIO");
+	if (IS_ERR(ts->vddio)) {
+		error = PTR_ERR(ts->vddio);
+		if (error != -EPROBE_DEFER)
+			dev_err(dev,
+				"Failed to get VDDIO regulator: %d\n", error);
+		return error;
+	}
+
+	/* Get the interrupt GPIO pin number */
+	gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
+	if (IS_ERR(gpiod)) {
+		error = PTR_ERR(gpiod);
+		if (error != -EPROBE_DEFER)
+			dev_dbg(dev, "Failed to get %s GPIO: %d\n",
+				GOODIX_GPIO_INT_NAME, error);
+		return error;
+	}
+
+	// WARNING: SUPER UGLY HACK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	dev_dbg(dev, "removing ACTIVE_LOW flag");
+	*((unsigned long*)(((void*)gpiod) + sizeof(void*))) &= ~BIT(6);
+
+	ts->gpiod_int = gpiod;
+
+	/* Get the reset line GPIO pin number */
+	gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_IN);
+	if (IS_ERR(gpiod)) {
+		error = PTR_ERR(gpiod);
+		if (error != -EPROBE_DEFER)
+			dev_dbg(dev, "Failed to get %s GPIO: %d\n",
+				GOODIX_GPIO_RST_NAME, error);
+		return error;
+	}
+
+	ts->gpiod_rst = gpiod;
+
+	return 0;
+}
+
+/**
+ * goodix_read_config - Read the embedded configuration of the panel
+ *
+ * @ts: our goodix_ts_data pointer
+ *
+ * Must be called during probe
+ */
+static void goodix_read_config(struct goodix_ts_data *ts)
+{
+	u8 config[GOODIX_CONFIG_MAX_LENGTH];
+	int x_max, y_max;
+	int error;
+
+	error = goodix_i2c_read(ts->client, ts->chip->config_addr,
+				config, ts->chip->config_len);
+	if (error) {
+		dev_warn(&ts->client->dev, "Error reading config: %d\n",
+			 error);
+		ts->int_trigger_type = GOODIX_INT_TRIGGER;
+		ts->max_touch_num = GOODIX_MAX_CONTACTS;
+		return;
+	}
+
+	ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
+	ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
+
+	x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
+	y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
+	if (x_max && y_max) {
+		input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
+		input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
+	}
+}
+
+/**
+ * goodix_read_version - Read goodix touchscreen version
+ *
+ * @ts: our goodix_ts_data pointer
+ */
+static int goodix_read_version(struct goodix_ts_data *ts)
+{
+	int error;
+	u8 buf[6];
+	char id_str[5];
+
+	error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
+	if (error) {
+		dev_err(&ts->client->dev, "read version failed: %d\n", error);
+		return error;
+	}
+
+	memcpy(id_str, buf, 4);
+	id_str[4] = 0;
+	if (kstrtou16(id_str, 10, &ts->id))
+		ts->id = 0x1001;
+
+	ts->version = get_unaligned_le16(&buf[4]);
+
+	dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id,
+		 ts->version);
+
+	return 0;
+}
+
+/**
+ * goodix_i2c_test - I2C test function to check if the device answers.
+ *
+ * @client: the i2c client
+ */
+static int goodix_i2c_test(struct i2c_client *client)
+{
+	int retry = 0;
+	int error;
+	u8 test;
+
+	while (retry++ < 2) {
+		error = goodix_i2c_read(client, GOODIX_REG_ID,
+					&test, 1);
+		if (!error)
+			return 0;
+
+		dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
+			retry, error);
+		msleep(20);
+	}
+
+	return error;
+}
+
+/**
+ * goodix_configure_dev - Finish device initialization
+ *
+ * @ts: our goodix_ts_data pointer
+ *
+ * Must be called from probe to finish initialization of the device.
+ * Contains the common initialization code for both devices that
+ * declare gpio pins and devices that do not. It is either called
+ * directly from probe or from request_firmware_wait callback.
+ */
+static int goodix_configure_dev(struct goodix_ts_data *ts)
+{
+	int error;
+
+	ts->int_trigger_type = GOODIX_INT_TRIGGER;
+	ts->max_touch_num = GOODIX_MAX_CONTACTS;
+
+	ts->input_dev = devm_input_allocate_device(&ts->client->dev);
+	if (!ts->input_dev) {
+		dev_err(&ts->client->dev, "Failed to allocate input device.");
+		return -ENOMEM;
+	}
+
+	ts->input_dev->name = "Goodix Capacitive TouchScreen";
+	ts->input_dev->phys = "input/ts";
+	ts->input_dev->id.bustype = BUS_I2C;
+	ts->input_dev->id.vendor = 0x0416;
+	ts->input_dev->id.product = ts->id;
+	ts->input_dev->id.version = ts->version;
+
+	/* Capacitive Windows/Home button on some devices */
+	input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
+
+	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
+	input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
+	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+
+	/* Read configuration and apply touchscreen parameters */
+	goodix_read_config(ts);
+
+	/* Try overriding touchscreen parameters via device properties */
+	touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
+
+	if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
+		dev_err(&ts->client->dev,
+			"Invalid config (%d, %d, %d), using defaults\n",
+			ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);
+		ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
+		ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
+		ts->max_touch_num = GOODIX_MAX_CONTACTS;
+		input_abs_set_max(ts->input_dev,
+				  ABS_MT_POSITION_X, ts->prop.max_x);
+		input_abs_set_max(ts->input_dev,
+				  ABS_MT_POSITION_Y, ts->prop.max_y);
+	}
+
+	if (dmi_check_system(rotated_screen)) {
+		ts->prop.invert_x = true;
+		ts->prop.invert_y = true;
+		dev_dbg(&ts->client->dev,
+			"Applying '180 degrees rotated screen' quirk\n");
+	}
+
+	error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
+				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"Failed to initialize MT slots: %d", error);
+		return error;
+	}
+
+	error = input_register_device(ts->input_dev);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"Failed to register input device: %d", error);
+		return error;
+	}
+
+	ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
+	error = goodix_request_irq(ts);
+	if (error) {
+		dev_err(&ts->client->dev, "request IRQ failed: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+/**
+ * goodix_config_cb - Callback to finish device init
+ *
+ * @ts: our goodix_ts_data pointer
+ *
+ * request_firmware_wait callback that finishes
+ * initialization of the device.
+ */
+static void goodix_config_cb(const struct firmware *cfg, void *ctx)
+{
+	struct goodix_ts_data *ts = ctx;
+	int error;
+
+	if (cfg) {
+		/* send device configuration to the firmware */
+		error = goodix_send_cfg(ts, cfg);
+		if (error)
+			goto err_release_cfg;
+	}
+
+	goodix_configure_dev(ts);
+
+err_release_cfg:
+	release_firmware(cfg);
+	complete_all(&ts->firmware_loading_complete);
+}
+
+static void goodix_disable_regulators(void *arg)
+{
+	struct goodix_ts_data *ts = arg;
+
+	regulator_disable(ts->vddio);
+	regulator_disable(ts->avdd28);
+}
+
+static int goodix_ts_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct goodix_ts_data *ts;
+	struct dmi_system_id *dmi_match;
+	int error;
+
+	dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "I2C check functionality failed.\n");
+		return -ENXIO;
+	}
+
+	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->client = client;
+	i2c_set_clientdata(client, ts);
+	init_completion(&ts->firmware_loading_complete);
+
+#ifdef CONFIG_ACPI
+	dmi_match = dmi_first_match(need_gpio_mapping);
+	if (dmi_match) {
+		dev_dbg(&client->dev, "GPIO mapping quirk applied.\n");
+		devm_acpi_dev_add_driver_gpios(&client->dev, dmi_match->driver_data);
+	}
+#endif
+
+	error = goodix_get_gpio_config(ts);
+	if (error)
+		return error;
+
+	/* power up the controller */
+	error = regulator_enable(ts->avdd28);
+	if (error) {
+		dev_err(&client->dev,
+			"Failed to enable AVDD28 regulator: %d\n",
+			error);
+		return error;
+	}
+
+	error = regulator_enable(ts->vddio);
+	if (error) {
+		dev_err(&client->dev,
+			"Failed to enable VDDIO regulator: %d\n",
+			error);
+		regulator_disable(ts->avdd28);
+		return error;
+	}
+
+	error = devm_add_action_or_reset(&client->dev,
+					 goodix_disable_regulators, ts);
+	if (error)
+		return error;
+
+	if (ts->gpiod_int && ts->gpiod_rst) {
+		/* reset the controller */
+		error = goodix_reset(ts);
+		if (error) {
+			dev_err(&client->dev, "Controller reset failed.\n");
+			return error;
+		}
+	}
+
+	error = goodix_i2c_test(client);
+	if (error) {
+		dev_err(&client->dev, "I2C communication failure: %d\n", error);
+		return error;
+	}
+
+	error = goodix_read_version(ts);
+	if (error) {
+		dev_err(&client->dev, "Read version failed.\n");
+		return error;
+	}
+
+	ts->chip = goodix_get_chip_data(ts->id);
+
+	if (ts->gpiod_int && ts->gpiod_rst) {
+		/* update device config */
+		ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL,
+					      "goodix_%d_cfg.bin", ts->id);
+		if (!ts->cfg_name)
+			return -ENOMEM;
+
+		error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name,
+						&client->dev, GFP_KERNEL, ts,
+						goodix_config_cb);
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to invoke firmware loader: %d\n",
+				error);
+			return error;
+		}
+
+		return 0;
+	} else {
+		error = goodix_configure_dev(ts);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+static int goodix_ts_remove(struct i2c_client *client)
+{
+	struct goodix_ts_data *ts = i2c_get_clientdata(client);
+
+	if (ts->gpiod_int && ts->gpiod_rst)
+		wait_for_completion(&ts->firmware_loading_complete);
+
+	return 0;
+}
+
+static int __maybe_unused goodix_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct goodix_ts_data *ts = i2c_get_clientdata(client);
+	int error;
+
+	/* We need gpio pins to suspend/resume */
+	if (!ts->gpiod_int || !ts->gpiod_rst) {
+		disable_irq(client->irq);
+		return 0;
+	}
+
+	wait_for_completion(&ts->firmware_loading_complete);
+
+	/* Free IRQ as IRQ pin is used as output in the suspend sequence */
+	goodix_free_irq(ts);
+
+	/* Output LOW on the INT pin for 5 ms */
+	error = gpiod_direction_output(ts->gpiod_int, 0);
+	if (error) {
+		goodix_request_irq(ts);
+		return error;
+	}
+
+	usleep_range(5000, 6000);
+
+	error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
+				    GOODIX_CMD_SCREEN_OFF);
+	if (error) {
+		dev_err(&ts->client->dev, "Screen off command failed\n");
+		gpiod_direction_input(ts->gpiod_int);
+		goodix_request_irq(ts);
+		return -EAGAIN;
+	}
+
+	/*
+	 * The datasheet specifies that the interval between sending screen-off
+	 * command and wake-up should be longer than 58 ms. To avoid waking up
+	 * sooner, delay 58ms here.
+	 */
+	msleep(58);
+	return 0;
+}
+
+static int __maybe_unused goodix_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct goodix_ts_data *ts = i2c_get_clientdata(client);
+	int error;
+
+	if (!ts->gpiod_int || !ts->gpiod_rst) {
+		enable_irq(client->irq);
+		return 0;
+	}
+
+	/*
+	 * Exit sleep mode by outputting HIGH level to INT pin
+	 * for 2ms~5ms.
+	 */
+	error = gpiod_direction_output(ts->gpiod_int, 1);
+	if (error)
+		return error;
+
+	usleep_range(2000, 5000);
+
+	error = goodix_int_sync(ts);
+	if (error)
+		return error;
+
+	error = goodix_request_irq(ts);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
+
+static const struct i2c_device_id goodix_ts_id[] = {
+	{ "GDIX1001:00", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id goodix_acpi_match[] = {
+	{ "GDIX1001", 0 },
+	{ "GDIX1002", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id goodix_of_match[] = {
+	{ .compatible = "goodix,gt1151" },
+	{ .compatible = "goodix,gt5663" },
+	{ .compatible = "goodix,gt5688" },
+	{ .compatible = "goodix,gt911" },
+	{ .compatible = "goodix,gt9110" },
+	{ .compatible = "goodix,gt912" },
+	{ .compatible = "goodix,gt927" },
+	{ .compatible = "goodix,gt9271" },
+	{ .compatible = "goodix,gt928" },
+	{ .compatible = "goodix,gt967" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, goodix_of_match);
+#endif
+
+static struct i2c_driver goodix_ts_driver = {
+	.probe = goodix_ts_probe,
+	.remove = goodix_ts_remove,
+	.id_table = goodix_ts_id,
+	.driver = {
+		.name = "Goodix-TS",
+		.acpi_match_table = ACPI_PTR(goodix_acpi_match),
+		.of_match_table = of_match_ptr(goodix_of_match),
+		.pm = &goodix_pm_ops,
+	},
+};
+module_i2c_driver(goodix_ts_driver);
+
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
+MODULE_DESCRIPTION("Goodix touchscreen driver");
+MODULE_LICENSE("GPL v2");