diff mbox series

[2/6] input: touchscreen: add focaltech FTS driver

Message ID 20220123173650.290349-3-caleb@connolly.tech (mailing list archive)
State New
Headers show
Series Add support for the SHIFT SHIFT6mq | expand

Commit Message

Caleb Connolly Jan. 23, 2022, 5:37 p.m. UTC
The focaltech FTS driver supports several variants of focaltech touch
screens found in ~2018 era smartphones including a variant of the
PocoPhone F1 and the SHIFT6mq. This driver is loosely based on the
original driver from Focaltech but has been simplified and largely
reworked.

Signed-off-by: Caleb Connolly <caleb@connolly.tech>
---
 drivers/input/touchscreen/Kconfig         |   9 +
 drivers/input/touchscreen/Makefile        |   1 +
 drivers/input/touchscreen/focaltech_fts.c | 870 ++++++++++++++++++++++
 3 files changed, 880 insertions(+)
 create mode 100644 drivers/input/touchscreen/focaltech_fts.c

--
2.34.1
diff mbox series

Patch

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2f6adfb7b938..10874f2d17ac 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -372,6 +372,15 @@  config TOUCHSCREEN_EXC3000
 	  To compile this driver as a module, choose M here: the
 	  module will be called exc3000.

+config TOUCHSCREEN_FOCALTECH_FTS
+	tristate "Focaltech FTS Touchscreen"
+	depends on I2C
+	help
+	  Say Y here to enable support for Focaltech FTS based
+	  touch panels, including the 5452 and 8917 panels.
+
+	  If unsure, say N.
+
 config TOUCHSCREEN_FUJITSU
 	tristate "Fujitsu serial touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 39a8127cf6a5..79f877d4ba02 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -44,6 +44,7 @@  obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o
 obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
 obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL)	+= egalax_ts_serial.o
 obj-$(CONFIG_TOUCHSCREEN_EXC3000)	+= exc3000.o
+obj-$(CONFIG_TOUCHSCREEN_FOCALTECH_FTS)	+= focaltech_fts.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix_ts.o
 obj-$(CONFIG_TOUCHSCREEN_HIDEEP)	+= hideep.o
diff --git a/drivers/input/touchscreen/focaltech_fts.c b/drivers/input/touchscreen/focaltech_fts.c
new file mode 100644
index 000000000000..c62dc40a5bd0
--- /dev/null
+++ b/drivers/input/touchscreen/focaltech_fts.c
@@ -0,0 +1,870 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * FocalTech touchscreen driver.
+ *
+ * Copyright (c) 2010-2017, FocalTech Systems, Ltd., all rights reserved.
+ * Copyright (C) 2018 XiaoMi, Inc.
+ * Copyright (c) 2021 Caleb Connolly <caleb@connolly.tech>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mutex.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/workqueue.h>
+#include <linux/uaccess.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/netdevice.h>
+#include <linux/unistd.h>
+#include <linux/vmalloc.h>
+#include <linux/notifier.h>
+
+#define FTS_CMD_START1 0x55
+#define FTS_CMD_START2 0xAA
+#define FTS_CMD_START_DELAY 10
+#define FTS_CMD_READ_ID 0x90
+#define FTS_CMD_READ_ID_LEN 4
+
+#define FTS_REG_INT_CNT 0x8F
+#define FTS_REG_FLOW_WORK_CNT 0x91
+#define FTS_REG_WORKMODE 0x00
+#define FTS_REG_WORKMODE_FACTORY_VALUE 0x40
+#define FTS_REG_WORKMODE_WORK_VALUE 0x00
+#define FTS_REG_ESDCHECK_DISABLE 0x8D
+#define FTS_REG_CHIP_ID 0xA3
+#define FTS_REG_CHIP_ID2 0x9F
+#define FTS_REG_POWER_MODE 0xA5
+#define FTS_REG_POWER_MODE_SLEEP_VALUE 0x03
+#define FTS_REG_FW_VER 0xA6
+#define FTS_REG_VENDOR_ID 0xA8
+#define FTS_REG_LCD_BUSY_NUM 0xAB
+#define FTS_REG_FACE_DEC_MODE_EN 0xB0
+#define FTS_REG_FACE_DEC_MODE_STATUS 0x01
+#define FTS_REG_IDE_PARA_VER_ID 0xB5
+#define FTS_REG_IDE_PARA_STATUS 0xB6
+#define FTS_REG_GLOVE_MODE_EN 0xC0
+#define FTS_REG_COVER_MODE_EN 0xC1
+#define FTS_REG_CHARGER_MODE_EN 0x8B
+#define FTS_REG_GESTURE_EN 0xD0
+#define FTS_REG_GESTURE_OUTPUT_ADDRESS 0xD3
+#define FTS_REG_MODULE_ID 0xE3
+#define FTS_REG_LIC_VER 0xE4
+#define FTS_REG_ESD_SATURATE 0xED
+
+#define FTS_MAX_POINTS_SUPPORT 10
+#define FTS_ONE_TCH_LEN 6
+
+#define FTS_MAX_ID 0x0A
+#define FTS_TOUCH_X_H_POS 3
+#define FTS_TOUCH_X_L_POS 4
+#define FTS_TOUCH_Y_H_POS 5
+#define FTS_TOUCH_Y_L_POS 6
+#define FTS_TOUCH_PRE_POS 7
+#define FTS_TOUCH_AREA_POS 8
+#define FTS_TOUCH_POINT_NUM 2
+#define FTS_TOUCH_EVENT_POS 3
+#define FTS_TOUCH_ID_POS 5
+#define FTS_COORDS_ARR_SIZE 2
+
+#define FTS_TOUCH_DOWN 0
+#define FTS_TOUCH_UP 1
+#define FTS_TOUCH_CONTACT 2
+
+#define EVENT_DOWN(flag) ((flag == FTS_TOUCH_DOWN) || (flag == FTS_TOUCH_CONTACT))
+
+#define FTS_LOCKDOWN_INFO_SIZE 8
+#define LOCKDOWN_INFO_ADDR 0x1FA0
+
+#define FTS_DRIVER_NAME "fts-i2c"
+#define INTERVAL_READ_REG 100 /* unit:ms */
+#define TIMEOUT_READ_REG 2000 /* unit:ms */
+#define FTS_VDD_MIN_UV 2600000
+#define FTS_VDD_MAX_UV 3300000
+#define FTS_I2C_VCC_MIN_UV 1800000
+#define FTS_I2C_VCC_MAX_UV 1800000
+
+#define I2C_RETRY_NUMBER 3
+
+#define CHIP_TYPE_5452 0x5452
+#define CHIP_TYPE_8719 0x8719
+
+static DEFINE_MUTEX(i2c_rw_access);
+
+struct ts_event {
+	int x; /*x coordinate */
+	int y; /*y coordinate */
+	int p; /* pressure */
+	int flag; /* touch event flag: 0 -- down; 1-- up; 2 -- contact */
+	int id; /*touch ID */
+	int area;
+};
+
+struct fts_ts_data {
+	struct i2c_client *client;
+	struct input_dev *input_dev;
+	struct regulator *vdd;
+	struct regulator *vcc_i2c;
+	spinlock_t irq_lock;
+	struct mutex report_mutex;
+	int irq;
+	bool irq_disabled;
+	bool power_disabled;
+
+	/* multi-touch */
+	struct ts_event *events;
+	u32 max_touch_number;
+	u8 *point_buf;
+	int pnt_buf_size;
+	int touches;
+	int touch_point;
+	int point_num;
+	bool dev_pm_suspend;
+	bool low_power_mode;
+	struct completion dev_pm_suspend_completion;
+	struct pinctrl *pinctrl;
+
+	// DT data
+	struct gpio_desc *irq_gpio;
+	struct gpio_desc *reset_gpio;
+	u32 width;
+	u32 height;
+};
+
+int fts_i2c_read(struct i2c_client *client, char *writebuf, int writelen,
+		 char *readbuf, int readlen)
+{
+	int ret = 0;
+	int msg_count = !!writelen + 1;
+	struct i2c_msg msgs[2];
+
+	if (readlen < 0 || writelen < 0)
+		return -EINVAL;
+
+	// If writelen is zero then only populate msgs[0].
+	// otherwise we read into msgs[1]
+	msgs[msg_count-1].len = readlen;
+	msgs[msg_count-1].buf = readbuf;
+	msgs[msg_count-1].addr = client->addr;
+	msgs[msg_count-1].flags = I2C_M_RD;
+
+	if (writelen > 0) {
+		msgs[0].len = writelen;
+		msgs[0].buf = writebuf;
+		msgs[0].addr = client->addr;
+		msgs[0].flags = 0;
+	}
+
+	mutex_lock(&i2c_rw_access);
+
+	ret = i2c_transfer(client->adapter, msgs, msg_count);
+
+	mutex_unlock(&i2c_rw_access);
+	return ret;
+}
+
+int fts_i2c_read_reg(struct i2c_client *client, u8 regaddr, u8 *regvalue)
+{
+	return fts_i2c_read(client, &regaddr, 1, regvalue, 1);
+}
+
+static bool fts_chip_is_valid(struct fts_ts_data *data, u16 id)
+{
+	if (id != CHIP_TYPE_5452 && id != CHIP_TYPE_8719)
+		return false;
+
+	return true;
+}
+
+int fts_wait_ready(struct fts_ts_data *data)
+{
+	int ret = 0;
+	int cnt = 0;
+	u8 reg_value[2];
+	struct i2c_client *client = data->client;
+
+	do {
+		ret = fts_i2c_read_reg(client, FTS_REG_CHIP_ID, &reg_value[0]);
+		ret = fts_i2c_read_reg(client, FTS_REG_CHIP_ID2, &reg_value[1]);
+		if (fts_chip_is_valid(data, reg_value[0] << 8 | reg_value[1])) {
+			dev_dbg(&data->client->dev, "TP Ready, Device ID = 0x%x%x, count = %d",
+				reg_value[0], reg_value[1], cnt);
+			return 0;
+		}
+		cnt++;
+		msleep(INTERVAL_READ_REG);
+	} while ((cnt * INTERVAL_READ_REG) < TIMEOUT_READ_REG);
+
+	return -EIO;
+}
+
+static int fts_power_source_init(struct fts_ts_data *data)
+{
+	int ret = 0;
+
+	data->vdd = devm_regulator_get(&data->client->dev, "vdd");
+	if (IS_ERR_OR_NULL(data->vdd)) {
+		ret = PTR_ERR(data->vdd);
+		dev_err(&data->client->dev, "get vdd regulator failed,ret=%d", ret);
+		return ret;
+	}
+
+	if (regulator_count_voltages(data->vdd) > 0) {
+		ret = regulator_set_voltage(data->vdd, FTS_VDD_MIN_UV,
+					    FTS_VDD_MAX_UV);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "failed to set vdd regulator ret=%d", ret);
+			goto exit;
+		}
+	}
+
+	data->vcc_i2c = devm_regulator_get(&data->client->dev, "vcc-i2c");
+	if (IS_ERR(data->vcc_i2c)) {
+		ret = PTR_ERR(data->vcc_i2c);
+		dev_err(&data->client->dev, "get vcc_i2c regulator failed,ret=%d", ret);
+		return ret;
+	}
+
+	if (regulator_count_voltages(data->vcc_i2c) > 0) {
+		ret = regulator_set_voltage(data->vcc_i2c, FTS_I2C_VCC_MIN_UV,
+					    FTS_I2C_VCC_MAX_UV);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "failed to set vcc_i2c regulator ret=%d",
+				ret);
+			goto exit;
+		}
+	}
+
+exit:
+	return ret;
+}
+
+static int fts_power_source_release(struct fts_ts_data *data)
+{
+	if (!data->power_disabled) {
+		regulator_disable(data->vdd);
+		regulator_disable(data->vcc_i2c);
+	}
+
+	devm_regulator_put(data->vdd);
+	devm_regulator_put(data->vcc_i2c);
+
+	return 0;
+}
+
+static int fts_power_source_ctrl(struct fts_ts_data *data, bool enable)
+{
+	int ret = 0;
+
+	if (enable) {
+		if (data->power_disabled) {
+			ret = regulator_enable(data->vdd);
+			if (ret < 0) {
+				dev_err(&data->client->dev,
+					"enable vdd regulator failed,ret=%d",
+					ret);
+			}
+
+			ret = regulator_enable(data->vcc_i2c);
+			if (ret < 0) {
+				dev_err(&data->client->dev, "enable vcc_i2c regulator failed,ret=%d",
+					  ret);
+			}
+			data->power_disabled = false;
+		}
+	} else {
+		if (!data->power_disabled) {
+			ret = regulator_disable(data->vdd);
+			if (ret < 0) {
+				dev_err(&data->client->dev,
+					"disable vdd regulator failed,ret=%d",
+					ret);
+			}
+
+			ret = regulator_disable(data->vcc_i2c);
+			if (ret < 0) {
+				dev_err(&data->client->dev, "disable vcc_i2c regulator failed,ret=%d",
+					  ret);
+			}
+
+			data->power_disabled = true;
+		}
+	}
+
+	return ret;
+}
+
+static int fts_pinctrl_set_active(struct fts_ts_data *data, bool enable)
+{
+	int ret = 0;
+	struct pinctrl_state *state = pinctrl_lookup_state(data->pinctrl,
+		enable ? "default" : "suspend");
+
+	if (IS_ERR_OR_NULL(state)) {
+		dev_err(&data->client->dev, "pinctrl lookup %s failed\n",
+			enable ? "default" : "suspend");
+		return -EINVAL;
+	}
+
+	ret = pinctrl_select_state(data->pinctrl, state);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to set pinctrl state: enable = %d, ret = %d",
+			enable, ret);
+	}
+
+	return ret;
+}
+
+static void fts_release_all_finger(struct fts_ts_data *data)
+{
+	struct input_dev *input_dev = data->input_dev;
+	u32 finger_count = 0;
+
+	mutex_lock(&data->report_mutex);
+
+	for (finger_count = 0; finger_count < data->max_touch_number;
+	     finger_count++) {
+		input_mt_slot(input_dev, finger_count);
+		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
+	}
+
+	input_report_key(input_dev, BTN_TOUCH, 0);
+	input_sync(input_dev);
+
+	mutex_unlock(&data->report_mutex);
+}
+
+static int fts_input_report_b(struct fts_ts_data *data)
+{
+	int i = 0;
+	int uppoint = 0;
+	int touches = 0;
+	bool va_reported = false;
+	struct ts_event *events = data->events;
+
+	for (i = 0; i < data->touch_point; i++) {
+		if (events[i].id >= data->max_touch_number)
+			break;
+
+		va_reported = true;
+		input_mt_slot(data->input_dev, events[i].id);
+
+		if (events[i].flag == FTS_TOUCH_DOWN || events[i].flag == FTS_TOUCH_CONTACT) {
+			input_mt_report_slot_state(data->input_dev,
+						   MT_TOOL_FINGER, true);
+
+			if (events[i].p <= 0)
+				events[i].p = 0x3f;
+
+			input_report_abs(data->input_dev, ABS_MT_PRESSURE,
+					 events[i].p);
+
+			if (events[i].area <= 0)
+				events[i].area = 0x09;
+
+			input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR,
+					 events[i].area);
+			input_report_abs(data->input_dev, ABS_MT_POSITION_X,
+					 events[i].x);
+			input_report_abs(data->input_dev, ABS_MT_POSITION_Y,
+					 events[i].y);
+
+			touches |= BIT(events[i].id);
+			data->touches |= BIT(events[i].id);
+		} else {
+			uppoint++;
+
+			input_report_abs(data->input_dev, ABS_MT_PRESSURE, 0);
+
+			input_mt_report_slot_state(data->input_dev,
+						   MT_TOOL_FINGER, false);
+			data->touches &= ~BIT(events[i].id);
+		}
+	}
+
+	if (data->touches ^ touches) {
+		for (i = 0; i < data->max_touch_number; i++) {
+			if (BIT(i) & (data->touches ^ touches)) {
+				va_reported = true;
+				input_mt_slot(data->input_dev, i);
+				input_mt_report_slot_state(
+					data->input_dev, MT_TOOL_FINGER, false);
+			}
+		}
+	}
+	data->touches = touches;
+
+	if (va_reported) {
+		if (!data->point_num || !touches)
+			input_report_key(data->input_dev, BTN_TOUCH, 0);
+		else
+			input_report_key(data->input_dev, BTN_TOUCH, 1);
+	} else {
+		dev_err(&data->client->dev, "va not reported, but touches=%d", touches);
+	}
+
+	input_sync(data->input_dev);
+	return 0;
+}
+
+static int fts_read_touchdata(struct fts_ts_data *data)
+{
+	int ret = 0;
+	int i = 0;
+	u8 pointid;
+	int base;
+	struct ts_event *events = data->events;
+	int max_touch_num = data->max_touch_number;
+	u8 *buf = data->point_buf;
+
+	data->point_num = 0;
+	data->touch_point = 0;
+
+	memset(buf, 0xFF, data->pnt_buf_size);
+	buf[0] = 0x00;
+
+	ret = fts_i2c_read(data->client, buf, 1, buf, data->pnt_buf_size);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "read touchdata failed, ret:%d", ret);
+		return ret;
+	}
+	data->point_num = buf[FTS_TOUCH_POINT_NUM] & 0x0F;
+
+	if (data->point_num > max_touch_num)
+		return -EINVAL;
+
+	for (i = 0; i < max_touch_num; i++) {
+		base = FTS_ONE_TCH_LEN * i;
+
+		pointid = (buf[FTS_TOUCH_ID_POS + base]) >> 4;
+		if (pointid >= FTS_MAX_ID)
+			break;
+
+		else if (pointid >= max_touch_num)
+			return -EINVAL;
+
+		data->touch_point++;
+
+		events[i].x = ((buf[FTS_TOUCH_X_H_POS + base] & 0x0F) << 8) +
+			      (buf[FTS_TOUCH_X_L_POS + base] & 0xFF);
+		events[i].y = ((buf[FTS_TOUCH_Y_H_POS + base] & 0x0F) << 8) +
+			      (buf[FTS_TOUCH_Y_L_POS + base] & 0xFF);
+		events[i].flag = buf[FTS_TOUCH_EVENT_POS + base] >> 6;
+		events[i].id = buf[FTS_TOUCH_ID_POS + base] >> 4;
+		events[i].area = buf[FTS_TOUCH_AREA_POS + base] >> 4;
+		events[i].p = buf[FTS_TOUCH_PRE_POS + base];
+
+		if (((events[i].flag == FTS_TOUCH_DOWN) || (events[i].flag == FTS_TOUCH_CONTACT))
+		    && (data->point_num == 0)) {
+			dev_err(&data->client->dev, "abnormal touch data from fw");
+			return -EIO;
+		}
+	}
+	if (data->touch_point == 0) {
+		dev_err(&data->client->dev, "no touch point information");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void fts_report_event(struct fts_ts_data *data)
+{
+	fts_input_report_b(data);
+}
+
+static irqreturn_t fts_ts_interrupt(int irq, void *d)
+{
+	int ret = 0;
+	struct fts_ts_data *data = (struct fts_ts_data *)d;
+
+	if (!data) {
+		dev_err(&data->client->dev, "%s() Invalid fts_ts_data", __func__);
+		return IRQ_HANDLED;
+	}
+
+	if (data->dev_pm_suspend) {
+		ret = wait_for_completion_timeout(
+			&data->dev_pm_suspend_completion,
+			msecs_to_jiffies(700));
+		if (!ret) {
+			dev_err(&data->client->dev,
+				"Didn't resume in time, skipping wakeup event handling\n");
+			return IRQ_HANDLED;
+		}
+	}
+
+	ret = fts_read_touchdata(data);
+	if (ret == 0) {
+		mutex_lock(&data->report_mutex);
+		fts_report_event(data);
+		mutex_unlock(&data->report_mutex);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int fts_input_init(struct fts_ts_data *data)
+{
+	int ret = 0;
+	struct input_dev *input_dev;
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		dev_err(&data->client->dev, "Failed to allocate memory for input device");
+		return -ENOMEM;
+	}
+
+	/* Init and register Input device */
+	input_dev->name = FTS_DRIVER_NAME;
+	input_dev->id.bustype = BUS_I2C;
+	input_dev->dev.parent = &data->client->dev;
+
+	input_set_drvdata(input_dev, data);
+
+	__set_bit(EV_SYN, input_dev->evbit);
+	__set_bit(EV_ABS, input_dev->evbit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);
+	__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
+
+	input_mt_init_slots(input_dev, data->max_touch_number,
+			    INPUT_MT_DIRECT);
+
+	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
+			     data->width - 1, 0, 0);
+	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
+			     data->height - 1, 0, 0);
+	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 0xFF, 0, 0);
+
+	input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 0xFF, 0, 0);
+
+	data->pnt_buf_size = data->max_touch_number * FTS_ONE_TCH_LEN + 3;
+	data->point_buf = devm_kzalloc(&data->client->dev, data->pnt_buf_size, GFP_KERNEL);
+	if (!data->point_buf) {
+		dev_err(&data->client->dev, "Failed to alloc memory for point buf!");
+		ret = -ENOMEM;
+		goto err_out;
+	}
+
+	data->events = devm_kzalloc(&data->client->dev,
+		data->max_touch_number * sizeof(struct ts_event), GFP_KERNEL);
+	if (!data->events) {
+		ret = -ENOMEM;
+		goto err_out;
+	}
+	ret = input_register_device(input_dev);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Input device registration failed");
+		goto err_out;
+	}
+
+	data->input_dev = input_dev;
+
+	return 0;
+
+err_out:
+	input_set_drvdata(input_dev, NULL);
+	input_free_device(input_dev);
+	input_dev = NULL;
+
+	return ret;
+}
+
+static int fts_reset(struct fts_ts_data *data)
+{
+	gpiod_set_value_cansleep(data->reset_gpio, 0);
+	msleep(20);
+	gpiod_set_value_cansleep(data->reset_gpio, 1);
+
+	return 0;
+}
+
+static int fts_parse_dt(struct fts_ts_data *data)
+{
+	int ret = 0;
+	struct device *dev = &data->client->dev;
+	struct device_node *np = dev->of_node;
+	u32 val;
+
+	ret = of_property_read_u32(np, "touchscreen-size-x", &data->width);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Unable to read property 'touchscreen-size-x'");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(np, "touchscreen-size-y", &data->height);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Unable to read property 'touchscreen-size-y'");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(np, "focaltech,max-touch-number", &val);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Unable to read property 'focaltech,max-touch-number'");
+		return -EINVAL;
+	}
+	if (val < 2 || val > FTS_MAX_POINTS_SUPPORT) {
+		dev_err(&data->client->dev, "'focaltech,max-touch-number' out of range [2, %d]",
+			FTS_MAX_POINTS_SUPPORT);
+		return -EINVAL;
+	}
+	data->max_touch_number = val;
+
+	data->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (data->reset_gpio < 0) {
+		dev_err(&data->client->dev, "Unable to get reset gpio");
+		return -EINVAL;
+	}
+
+	data->irq_gpio = devm_gpiod_get_optional(dev, "irq", GPIOD_OUT_LOW);
+
+	return 0;
+}
+
+static int fts_ts_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret = 0;
+	struct fts_ts_data *data;
+	struct pinctrl_state *pinctrl_state_temp;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&data->client->dev, "I2C not supported");
+		return -ENODEV;
+	}
+
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	ret = fts_parse_dt(data);
+	if (ret < 0)
+		return ret;
+
+	i2c_set_clientdata(client, data);
+
+	spin_lock_init(&data->irq_lock);
+	mutex_init(&data->report_mutex);
+
+	ret = fts_input_init(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Input initialization fail");
+		goto err_input_init;
+	}
+
+	ret = fts_power_source_init(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "fail to get vdd/vcc_i2c regulator");
+		goto err_power_init;
+	}
+
+	data->power_disabled = true;
+	ret = fts_power_source_ctrl(data, true);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "fail to enable vdd/vcc_i2c regulator");
+		goto err_power_ctrl;
+	}
+
+	data->pinctrl = devm_pinctrl_get(&client->dev);
+	if (IS_ERR_OR_NULL(data->pinctrl)) {
+		dev_err(&data->client->dev, "Failed to get pinctrl, please check dts");
+		ret = PTR_ERR(data->pinctrl);
+		goto err_power_ctrl;
+	}
+
+	pinctrl_state_temp = pinctrl_lookup_state(data->pinctrl, "default");
+	if (IS_ERR_OR_NULL(pinctrl_state_temp) ||
+		IS_ERR_OR_NULL(pinctrl_lookup_state(data->pinctrl, "suspend"))) {
+		dev_err(&data->client->dev, "Failed to get default or suspend pinctrl state, please check dts");
+		goto err_power_ctrl;
+	}
+
+	fts_pinctrl_set_active(data, true);
+
+	ret = fts_reset(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Failed to reset chip");
+		goto err_gpio_config;
+	}
+
+	ret = fts_wait_ready(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Touch IC didn't turn on or is unsupported");
+		goto err_gpio_config;
+	}
+
+	if (data->irq_gpio) {
+		data->irq = gpiod_to_irq(data->irq_gpio);
+
+		ret = request_threaded_irq(data->irq, NULL, fts_ts_interrupt,
+					IRQF_ONESHOT,
+					data->client->name, data);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "request irq failed");
+			goto err_gpio_config;
+		}
+		device_init_wakeup(&client->dev, true);
+	}
+
+	data->dev_pm_suspend = false;
+	init_completion(&data->dev_pm_suspend_completion);
+
+	return 0;
+
+err_gpio_config:
+	fts_power_source_ctrl(data, false);
+err_power_ctrl:
+	fts_power_source_release(data);
+err_power_init:
+	input_unregister_device(data->input_dev);
+err_input_init:
+	devm_kfree(&client->dev, data);
+
+	return ret;
+}
+
+static int fts_ts_remove(struct i2c_client *client)
+{
+	struct fts_ts_data *data = i2c_get_clientdata(client);
+
+	free_irq(client->irq, data);
+	input_unregister_device(data->input_dev);
+
+	fts_power_source_ctrl(data, false);
+	fts_power_source_release(data);
+
+	kfree(data->point_buf);
+	kfree(data->events);
+
+	devm_kfree(&client->dev, data);
+
+	return 0;
+}
+
+static int fts_ts_suspend(struct device *dev)
+{
+	struct fts_ts_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	disable_irq(data->irq);
+
+	ret = fts_power_source_ctrl(data, false);
+	if (ret < 0)
+		dev_err(dev, "power off fail, ret=%d", ret);
+	fts_pinctrl_set_active(data, false);
+
+	return 0;
+}
+
+static int fts_ts_resume(struct device *dev)
+{
+	struct fts_ts_data *data = dev_get_drvdata(dev);
+
+	fts_release_all_finger(data);
+
+	fts_power_source_ctrl(data, true);
+	fts_pinctrl_set_active(data, true);
+
+	fts_wait_ready(data);
+
+	enable_irq(data->irq);
+
+	return 0;
+}
+
+static int fts_pm_suspend(struct device *dev)
+{
+	struct fts_ts_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	data->dev_pm_suspend = true;
+
+	if (data->low_power_mode) {
+		ret = enable_irq_wake(data->irq);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "enable_irq_wake(irq:%d) failed",
+				 data->irq);
+		}
+	} else {
+		ret = fts_ts_suspend(dev);
+	}
+
+	reinit_completion(&data->dev_pm_suspend_completion);
+
+	return ret;
+}
+
+static int fts_pm_resume(struct device *dev)
+{
+	struct fts_ts_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	data->dev_pm_suspend = false;
+
+	if (data->low_power_mode) {
+		ret = disable_irq_wake(data->irq);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "disable_irq_wake(irq:%d) failed",
+				 data->irq);
+		}
+	} else {
+		ret = fts_ts_resume(dev);
+	}
+
+	complete(&data->dev_pm_suspend_completion);
+
+	return 0;
+}
+
+static const struct dev_pm_ops fts_dev_pm_ops = {
+	.suspend = fts_pm_suspend,
+	.resume = fts_pm_resume,
+};
+
+static const struct of_device_id fts_match_table[] = {
+	{ .compatible = "focaltech,fts5452", },
+	{ .compatible = "focaltech,fts8719", },
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, fts_match_table);
+
+static struct i2c_driver fts_ts_driver = {
+	.probe = fts_ts_probe,
+	.remove = fts_ts_remove,
+	.driver = {
+		.name = FTS_DRIVER_NAME,
+		.pm = &fts_dev_pm_ops,
+		.of_match_table = fts_match_table,
+	},
+};
+module_i2c_driver(fts_ts_driver);
+
+MODULE_AUTHOR("Caleb Connolly <caleb@connolly.tech>");
+MODULE_DESCRIPTION("FocalTech touchscreen Driver");
+MODULE_LICENSE("GPL v2");