[v10,1/4] Input: Add driver for Cypress Generation 5 touchscreen

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index dc90a3ea51ee..f332afcb2541 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -284,6 +284,22 @@  config TOUCHSCREEN_CYTTSP4_SPI
 	  To compile this driver as a module, choose M here: the
 	  module will be called cyttsp4_spi.
 
+config TOUCHSCREEN_CYTTSP5
+	tristate "Cypress TrueTouch Gen5 Touchscreen Driver"
+	depends on I2C
+	select REGMAP_I2C
+	select CRC_ITU_T
+	help
+	  Driver for Parade TrueTouch Standard Product Generation 5
+	  touchscreen controllers. I2C bus interface support only.
+
+	  Say Y here if you have a Cypress Gen5 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cyttsp5.
+
 config TOUCHSCREEN_DA9034
 	tristate "Touchscreen support for Dialog Semiconductor DA9034"
 	depends on PMIC_DA903X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 557f84fd2075..044324c9dd13 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -30,6 +30,7 @@  obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)	+= cyttsp_spi.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE)	+= cyttsp4_core.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C)	+= cyttsp4_i2c.o cyttsp_i2c_common.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_SPI)	+= cyttsp4_spi.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP5)	+= cyttsp5.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)	+= da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DA9052)	+= da9052_tsi.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
diff --git a/drivers/input/touchscreen/cyttsp5.c b/drivers/input/touchscreen/cyttsp5.c
new file mode 100644
index 000000000000..85f849f2e37d
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp5.c
@@ -0,0 +1,902 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Parade TrueTouch(TM) Standard Product V5 Module.
+ *
+ * Copyright (C) 2015 Parade Technologies
+ * Copyright (C) 2012-2015 Cypress Semiconductor
+ * Copyright (C) 2018 Bootlin
+ *
+ * Authors: Mylène Josserand <mylene.josserand@bootlin.com>
+ *                Alistair Francis <alistair@alistair23.me>
+ */
+
+#include <linux/crc-itu-t.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <asm/unaligned.h>
+
+#define CYTTSP5_NAME				"cyttsp5"
+#define CY_I2C_DATA_SIZE			(2 * 256)
+#define HID_VERSION				0x0100
+#define CY_MAX_INPUT				512
+#define CYTTSP5_PREALLOCATED_CMD_BUFFER	32
+#define CY_BITS_PER_BTN			1
+#define CY_NUM_BTN_EVENT_ID			GENMASK(CY_BITS_PER_BTN, 0)
+
+#define MAX_AREA				255
+#define HID_OUTPUT_BL_SOP			0x1
+#define HID_OUTPUT_BL_EOP			0x17
+#define HID_OUTPUT_BL_LAUNCH_APP		0x3B
+#define HID_OUTPUT_BL_LAUNCH_APP_SIZE		11
+#define HID_OUTPUT_GET_SYSINFO			0x2
+#define HID_OUTPUT_GET_SYSINFO_SIZE		5
+#define HID_OUTPUT_MAX_CMD_SIZE		12
+
+#define HID_DESC_REG				0x1
+#define HID_INPUT_REG				0x3
+#define HID_OUTPUT_REG				0x4
+
+#define REPORT_ID_TOUCH			0x1
+#define REPORT_ID_BTN				0x3
+#define REPORT_SIZE_5				5
+#define REPORT_SIZE_8				8
+#define REPORT_SIZE_16				16
+
+/* Touch reports offsets */
+/* Header offsets */
+#define TOUCH_REPORT_DESC_HDR_CONTACTCOUNT	16
+/* Record offsets */
+#define TOUCH_REPORT_DESC_CONTACTID		8
+#define TOUCH_REPORT_DESC_X			16
+#define TOUCH_REPORT_DESC_Y			32
+#define TOUCH_REPORT_DESC_P			48
+#define TOUCH_REPORT_DESC_MAJ			56
+#define TOUCH_REPORT_DESC_MIN			64
+
+/* HID */
+#define HID_TOUCH_REPORT_ID			0x1
+#define HID_BTN_REPORT_ID			0x3
+#define HID_APP_RESPONSE_REPORT_ID		0x1F
+#define HID_APP_OUTPUT_REPORT_ID		0x2F
+#define HID_BL_RESPONSE_REPORT_ID		0x30
+#define HID_BL_OUTPUT_REPORT_ID		0x40
+
+#define HID_OUTPUT_RESPONSE_REPORT_OFFSET	2
+#define HID_OUTPUT_RESPONSE_CMD_OFFSET		4
+#define HID_OUTPUT_RESPONSE_CMD_MASK		GENMASK(6, 0)
+
+#define HID_SYSINFO_SENSING_OFFSET		33
+#define HID_SYSINFO_BTN_OFFSET			48
+#define HID_SYSINFO_BTN_MASK			GENMASK(7, 0)
+#define HID_SYSINFO_MAX_BTN			8
+
+#define CY_HID_OUTPUT_TIMEOUT_MS			200
+#define CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS	3000
+#define CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS	4000
+
+/* maximum number of concurrent tracks */
+#define TOUCH_REPORT_SIZE			10
+#define TOUCH_INPUT_HEADER_SIZE		7
+#define BTN_REPORT_SIZE			9
+#define BTN_INPUT_HEADER_SIZE			5
+
+#define MAX_CY_TCH_T_IDS	32
+
+/* All usage pages for Touch Report */
+#define TOUCH_REPORT_USAGE_PG_X		0x00010030
+#define TOUCH_REPORT_USAGE_PG_Y		0x00010031
+#define TOUCH_REPORT_USAGE_PG_P		0x000D0030
+#define TOUCH_REPORT_USAGE_PG_CONTACTID	0x000D0051
+#define TOUCH_REPORT_USAGE_PG_CONTACTCOUNT	0x000D0054
+#define TOUCH_REPORT_USAGE_PG_MAJ		0xFF010062
+#define TOUCH_REPORT_USAGE_PG_MIN		0xFF010063
+#define TOUCH_COL_USAGE_PG			0x000D0022
+
+/* System Information interface definitions */
+struct cyttsp5_sensing_conf_data_dev {
+	u8 electrodes_x;
+	u8 electrodes_y;
+	__le16 len_x;
+	__le16 len_y;
+	__le16 res_x;
+	__le16 res_y;
+	__le16 max_z;
+	u8 origin_x;
+	u8 origin_y;
+	u8 btn;
+	u8 scan_mode;
+	u8 max_num_of_tch_per_refresh_cycle;
+} __packed;
+
+struct cyttsp5_sensing_conf_data {
+	u16 res_x;
+	u16 res_y;
+	u16 max_z;
+	u16 len_x;
+	u16 len_y;
+	u8 origin_x;
+	u8 origin_y;
+	u8 max_tch;
+};
+
+enum cyttsp5_tch_abs {	/* for ordering within the extracted touch data array */
+	CY_TCH_X,	/* X */
+	CY_TCH_Y,	/* Y */
+	CY_TCH_P,	/* P (Z) */
+	CY_TCH_T,	/* TOUCH ID */
+	CY_TCH_MAJ,	/* TOUCH_MAJOR */
+	CY_TCH_MIN,	/* TOUCH_MINOR */
+	CY_TCH_NUM_ABS
+};
+
+struct cyttsp5_tch_abs_params {
+	size_t ofs;	/* abs byte offset */
+	size_t size;	/* size in bits */
+	size_t min;	/* min value */
+	size_t max;	/* max value */
+	size_t bofs;	/* bit offset */
+};
+
+struct cyttsp5_touch {
+	int abs[CY_TCH_NUM_ABS];
+};
+
+struct cyttsp5_sysinfo {
+	struct cyttsp5_sensing_conf_data sensing_conf_data;
+	int num_btns;
+	struct cyttsp5_tch_abs_params tch_hdr;
+	struct cyttsp5_tch_abs_params tch_abs[CY_TCH_NUM_ABS];
+	u32 key_code[HID_SYSINFO_MAX_BTN];
+};
+
+struct cyttsp5_hid_desc {
+	__le16 hid_desc_len;
+	u8 packet_id;
+	u8 reserved_byte;
+	__le16 bcd_version;
+	__le16 report_desc_len;
+	__le16 report_desc_register;
+	__le16 input_register;
+	__le16 max_input_len;
+	__le16 output_register;
+	__le16 max_output_len;
+	__le16 command_register;
+	__le16 data_register;
+	__le16 vendor_id;
+	__le16 product_id;
+	__le16 version_id;
+	u8 reserved[4];
+} __packed;
+
+struct cyttsp5 {
+	struct device *dev;
+	struct completion cmd_done;
+	struct cyttsp5_sysinfo sysinfo;
+	struct cyttsp5_hid_desc hid_desc;
+	u8 cmd_buf[CYTTSP5_PREALLOCATED_CMD_BUFFER];
+	u8 input_buf[CY_MAX_INPUT];
+	u8 response_buf[CY_MAX_INPUT];
+	struct gpio_desc *reset_gpio;
+	struct input_dev *input;
+	char phys[NAME_MAX];
+	int num_prv_rec;
+	struct regmap *regmap;
+	struct touchscreen_properties prop;
+	struct regulator *vdd;
+};
+
+/*
+ * For what is understood in the datasheet, the register does not
+ * matter. For consistency, use the Input Register address
+ * but it does mean anything to the device. The important data
+ * to send is the I2C address
+ */
+static int cyttsp5_read(struct cyttsp5 *ts, u8 *buf, u32 max)
+{
+	int error;
+	u32 size;
+	u8 temp[2];
+
+	/* Read the frame to retrieve the size */
+	error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, temp, sizeof(temp));
+	if (error)
+		return error;
+
+	size = get_unaligned_le16(temp);
+	if (!size || size == 2)
+		return 0;
+
+	if (size > max)
+		return -EINVAL;
+
+	/* Get the real value */
+	return regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, size);
+}
+
+static int cyttsp5_write(struct cyttsp5 *ts, unsigned int reg, u8 *data,
+			 size_t size)
+{
+	u8 cmd[HID_OUTPUT_MAX_CMD_SIZE];
+
+	if (size + 1 > HID_OUTPUT_MAX_CMD_SIZE)
+		return -E2BIG;
+
+	/* High bytes of register address needed as first byte of cmd */
+	cmd[0] = (reg >> 8) & 0xFF ;
+
+	/* Copy the rest of the data */
+	if (data)
+		memcpy(&cmd[1], data, size);
+
+	/*
+	 * The hardware wants to receive a frame with the address register
+	 * contained in the first two bytes. As the regmap_write function
+	 * add the register adresse in the frame, we use the low byte as
+	 * first frame byte for the address register and the first
+	 * data byte is the high register + left of the cmd to send
+	 */
+	return regmap_bulk_write(ts->regmap, reg & 0xFF, cmd, size + 1);
+}
+
+static void cyttsp5_get_touch_axis(int *axis, int size, int max, u8 *xy_data,
+				   int bofs)
+{
+	int nbyte;
+
+	for (nbyte = 0, *axis = 0; nbyte < size; nbyte++)
+		*axis += ((xy_data[nbyte] >> bofs) << (nbyte * 8));
+
+	*axis &= max - 1;
+}
+
+static void cyttsp5_get_touch_record(struct cyttsp5 *ts,
+				     struct cyttsp5_touch *touch, u8 *xy_data)
+{
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	enum cyttsp5_tch_abs abs;
+
+	for (abs = CY_TCH_X; abs < CY_TCH_NUM_ABS; abs++)
+		cyttsp5_get_touch_axis(&touch->abs[abs],
+				       si->tch_abs[abs].size,
+				       si->tch_abs[abs].max,
+				       xy_data + si->tch_abs[abs].ofs,
+				       si->tch_abs[abs].bofs);
+}
+
+static void cyttsp5_get_mt_touches(struct cyttsp5 *ts,
+				   struct cyttsp5_touch *tch, int num_cur_tch)
+{
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	int i, t = 0, offset = 0;
+	DECLARE_BITMAP(ids, MAX_CY_TCH_T_IDS);
+	u8 *tch_addr;
+	int tmp;
+
+	bitmap_zero(ids, MAX_CY_TCH_T_IDS);
+	memset(tch->abs, 0, sizeof(tch->abs));
+
+	switch (ts->input_buf[2]) {
+	case HID_TOUCH_REPORT_ID:
+		offset = TOUCH_INPUT_HEADER_SIZE;
+		break;
+	case HID_BTN_REPORT_ID:
+		offset = BTN_INPUT_HEADER_SIZE;
+		break;
+	}
+
+	for (i = 0; i < num_cur_tch; i++) {
+		tch_addr = ts->input_buf + offset + (i * TOUCH_REPORT_SIZE);
+		cyttsp5_get_touch_record(ts, tch, tch_addr);
+
+		/* Convert MAJOR/MINOR from mm to resolution */
+		tmp = tch->abs[CY_TCH_MAJ] * 100 * si->sensing_conf_data.res_x;
+		tch->abs[CY_TCH_MAJ] = tmp / si->sensing_conf_data.len_x;
+		tmp = tch->abs[CY_TCH_MIN] * 100 * si->sensing_conf_data.res_x;
+		tch->abs[CY_TCH_MIN] = tmp / si->sensing_conf_data.len_x;
+
+		t = tch->abs[CY_TCH_T];
+		input_mt_slot(ts->input, t);
+		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
+		__set_bit(t, ids);
+
+		/* position and pressure fields */
+		touchscreen_report_pos(ts->input, &ts->prop,
+				       tch->abs[CY_TCH_X], tch->abs[CY_TCH_Y],
+				       true);
+		input_report_abs(ts->input, ABS_MT_PRESSURE,
+				 tch->abs[CY_TCH_P]);
+
+		/* Get the extended touch fields */
+		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
+				 tch->abs[CY_TCH_MAJ]);
+		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
+				 tch->abs[CY_TCH_MIN]);
+	}
+
+	ts->num_prv_rec = num_cur_tch;
+}
+
+static int cyttsp5_mt_attention(struct device *dev)
+{
+	struct cyttsp5 *ts = dev_get_drvdata(dev);
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	int max_tch = si->sensing_conf_data.max_tch;
+	struct cyttsp5_touch tch;
+	int num_cur_tch;
+
+	cyttsp5_get_touch_axis(&num_cur_tch, si->tch_hdr.size,
+			       si->tch_hdr.max,
+			       ts->input_buf + 3 + si->tch_hdr.ofs,
+			       si->tch_hdr.bofs);
+
+	if (num_cur_tch > max_tch) {
+		dev_err(dev, "Num touch err detected (n=%d)\n", num_cur_tch);
+		num_cur_tch = max_tch;
+	}
+
+	if (num_cur_tch == 0 && ts->num_prv_rec == 0)
+		return 0;
+
+	/* extract xy_data for all currently reported touches */
+	if (num_cur_tch)
+		cyttsp5_get_mt_touches(ts, &tch, num_cur_tch);
+
+	input_mt_sync_frame(ts->input);
+	input_sync(ts->input);
+
+	return 0;
+}
+
+static int cyttsp5_setup_input_device(struct device *dev)
+{
+	struct cyttsp5 *ts = dev_get_drvdata(dev);
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	int max_x, max_y, max_p;
+	int max_x_tmp, max_y_tmp;
+	int error;
+
+	max_x_tmp = si->sensing_conf_data.res_x;
+	max_y_tmp = si->sensing_conf_data.res_y;
+	max_x = max_x_tmp - 1;
+	max_y = max_y_tmp - 1;
+	max_p = si->sensing_conf_data.max_z;
+
+	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, max_p, 0, 0);
+
+	input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
+	input_set_abs_params(ts->input, ABS_MT_TOUCH_MINOR, 0, MAX_AREA, 0, 0);
+
+	error = input_mt_init_slots(ts->input, si->tch_abs[CY_TCH_T].max,
+		INPUT_MT_DROP_UNUSED | INPUT_MT_DIRECT);
+	if (error < 0)
+		return error;
+
+	error = input_register_device(ts->input);
+	if (error < 0)
+		dev_err(dev, "Error, failed register input device r=%d\n", error);
+
+	return error;
+}
+
+static int cyttsp5_parse_dt_key_code(struct device *dev)
+{
+	struct cyttsp5 *ts = dev_get_drvdata(dev);
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+
+	if (!si->num_btns)
+		return 0;
+
+	/* Initialize the button to RESERVED */
+	memset32(si->key_code, KEY_RESERVED,  si->num_btns);
+
+	return device_property_read_u32_array(dev, "linux,keycodes",
+				   si->key_code, si->num_btns);
+}
+
+static int cyttsp5_btn_attention(struct device *dev)
+{
+	struct cyttsp5 *ts = dev_get_drvdata(dev);
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	int cur_btn, offset = 0;
+	int cur_btn_state;
+
+	switch (ts->input_buf[2]) {
+	case HID_TOUCH_REPORT_ID:
+		offset = TOUCH_INPUT_HEADER_SIZE;
+		break;
+	case HID_BTN_REPORT_ID:
+		offset = BTN_INPUT_HEADER_SIZE;
+		break;
+	}
+
+	if (ts->input_buf[2] != HID_BTN_REPORT_ID || !si->num_btns)
+		return 0;
+
+	/* extract button press/release touch information */
+	for (cur_btn = 0; cur_btn < si->num_btns; cur_btn++) {
+		/* Get current button state */
+		cur_btn_state = (ts->input_buf[offset] >> (cur_btn * CY_BITS_PER_BTN))
+			& CY_NUM_BTN_EVENT_ID;
+
+		input_report_key(ts->input, si->key_code[cur_btn],
+				 cur_btn_state);
+		input_sync(ts->input);
+	}
+
+	return 0;
+}
+
+static int cyttsp5_validate_cmd_response(struct cyttsp5 *ts, u8 code)
+{
+	u16 size, crc;
+	u8 status, report_id;
+	int command_code;
+
+	size = get_unaligned_le16(&ts->response_buf[0]);
+
+	if (!size)
+		return 0;
+
+	report_id = ts->response_buf[HID_OUTPUT_RESPONSE_REPORT_OFFSET];
+
+	switch (report_id) {
+	case HID_BL_RESPONSE_REPORT_ID: {
+		if (ts->response_buf[4] != HID_OUTPUT_BL_SOP) {
+			dev_err(ts->dev, "HID output response, wrong SOP\n");
+			return -EPROTO;
+		}
+
+		if (ts->response_buf[size - 1] != HID_OUTPUT_BL_EOP) {
+			dev_err(ts->dev, "HID output response, wrong EOP\n");
+			return -EPROTO;
+		}
+
+		crc = crc_itu_t(0xFFFF, &ts->response_buf[4], size - 7);
+		if (get_unaligned_le16(&ts->response_buf[size - 3]) != crc) {
+			dev_err(ts->dev, "HID output response, wrong CRC 0x%X\n",
+				crc);
+			return -EPROTO;
+		}
+
+		status = ts->response_buf[5];
+		if (status) {
+			dev_err(ts->dev, "HID output response, ERROR:%d\n",
+				status);
+			return -EPROTO;
+		}
+		break;
+	}
+	case HID_APP_RESPONSE_REPORT_ID: {
+		command_code = ts->response_buf[HID_OUTPUT_RESPONSE_CMD_OFFSET]
+			& HID_OUTPUT_RESPONSE_CMD_MASK;
+		if (command_code != code) {
+			dev_err(ts->dev,
+				"HID output response, wrong command_code:%X\n",
+				command_code);
+			return -EPROTO;
+		}
+		break;
+	}
+	}
+
+	return 0;
+}
+
+static void cyttsp5_si_get_btn_data(struct cyttsp5 *ts)
+{
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+	unsigned int btns = ts->response_buf[HID_SYSINFO_BTN_OFFSET]
+		& HID_SYSINFO_BTN_MASK;
+
+	si->num_btns = hweight8(btns);
+}
+
+static int cyttsp5_get_sysinfo_regs(struct cyttsp5 *ts)
+{
+	struct cyttsp5_sensing_conf_data *scd = &ts->sysinfo.sensing_conf_data;
+	struct cyttsp5_sensing_conf_data_dev *scd_dev =
+		(struct cyttsp5_sensing_conf_data_dev *)
+		&ts->response_buf[HID_SYSINFO_SENSING_OFFSET];
+
+	cyttsp5_si_get_btn_data(ts);
+
+	scd->max_tch = scd_dev->max_num_of_tch_per_refresh_cycle;
+	scd->res_x = get_unaligned_le16(&scd_dev->res_x);
+	scd->res_y = get_unaligned_le16(&scd_dev->res_y);
+	scd->max_z = get_unaligned_le16(&scd_dev->max_z);
+	scd->len_x = get_unaligned_le16(&scd_dev->len_x);
+	scd->len_y = get_unaligned_le16(&scd_dev->len_y);
+
+	return 0;
+}
+
+static int cyttsp5_hid_output_get_sysinfo(struct cyttsp5 *ts)
+{
+	int rc;
+	u8 cmd[HID_OUTPUT_GET_SYSINFO_SIZE];
+
+	/* HI bytes of Output register address */
+	put_unaligned_le16(HID_OUTPUT_GET_SYSINFO_SIZE, cmd);
+	cmd[2] = HID_APP_OUTPUT_REPORT_ID;
+	cmd[3] = 0x0; /* Reserved */
+	cmd[4] = HID_OUTPUT_GET_SYSINFO;
+
+	rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
+			   HID_OUTPUT_GET_SYSINFO_SIZE);
+	if (rc) {
+		dev_err(ts->dev, "Failed to write command %d", rc);
+		return rc;
+	}
+
+	rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
+						msecs_to_jiffies(CY_HID_OUTPUT_GET_SYSINFO_TIMEOUT_MS));
+	if (rc <= 0) {
+		dev_err(ts->dev, "HID output cmd execution timed out\n");
+		rc = -ETIMEDOUT;
+		return rc;
+	}
+
+	rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_GET_SYSINFO);
+	if (rc) {
+		dev_err(ts->dev, "Validation of the response failed\n");
+		return rc;
+	}
+
+	return cyttsp5_get_sysinfo_regs(ts);
+}
+
+static int cyttsp5_hid_output_bl_launch_app(struct cyttsp5 *ts)
+{
+	int rc;
+	u8 cmd[HID_OUTPUT_BL_LAUNCH_APP];
+	u16 crc;
+
+	put_unaligned_le16(HID_OUTPUT_BL_LAUNCH_APP_SIZE, cmd);
+	cmd[2] = HID_BL_OUTPUT_REPORT_ID;
+	cmd[3] = 0x0; /* Reserved */
+	cmd[4] = HID_OUTPUT_BL_SOP;
+	cmd[5] = HID_OUTPUT_BL_LAUNCH_APP;
+	put_unaligned_le16(0x00, &cmd[6]);
+	crc = crc_itu_t(0xFFFF, &cmd[4], 4);
+	put_unaligned_le16(crc, &cmd[8]);
+	cmd[10] = HID_OUTPUT_BL_EOP;
+
+	rc = cyttsp5_write(ts, HID_OUTPUT_REG, cmd,
+			   HID_OUTPUT_BL_LAUNCH_APP_SIZE);
+	if (rc) {
+		dev_err(ts->dev, "Failed to write command %d", rc);
+		return rc;
+	}
+
+	rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
+						msecs_to_jiffies(CY_HID_OUTPUT_TIMEOUT_MS));
+	if (rc <= 0) {
+		dev_err(ts->dev, "HID output cmd execution timed out\n");
+		rc = -ETIMEDOUT;
+		return rc;
+	}
+
+	rc = cyttsp5_validate_cmd_response(ts, HID_OUTPUT_BL_LAUNCH_APP);
+	if (rc) {
+		dev_err(ts->dev, "Validation of the response failed\n");
+		return rc;
+	}
+
+	return 0;
+}
+
+static int cyttsp5_get_hid_descriptor(struct cyttsp5 *ts,
+				      struct cyttsp5_hid_desc *desc)
+{
+	struct device *dev = ts->dev;
+	__le16 hid_desc_register = cpu_to_le16(HID_DESC_REG);
+	int rc;
+	u8 cmd[2];
+
+	/* Set HID descriptor register */
+	memcpy(cmd, &hid_desc_register, sizeof(hid_desc_register));
+
+	rc = cyttsp5_write(ts, HID_DESC_REG, NULL, 0);
+	if (rc) {
+		dev_err(dev, "Failed to get HID descriptor, rc=%d\n", rc);
+		return rc;
+	}
+
+	rc = wait_for_completion_interruptible_timeout(&ts->cmd_done,
+						msecs_to_jiffies(CY_HID_GET_HID_DESCRIPTOR_TIMEOUT_MS));
+	if (rc <= 0) {
+		dev_err(ts->dev, "HID get descriptor timed out\n");
+		rc = -ETIMEDOUT;
+		return rc;
+	}
+
+	memcpy(desc, ts->response_buf, sizeof(*desc));
+
+	/* Check HID descriptor length and version */
+	if (le16_to_cpu(desc->hid_desc_len) != sizeof(*desc) ||
+	    le16_to_cpu(desc->bcd_version) != HID_VERSION) {
+		dev_err(dev, "Unsupported HID version\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int fill_tch_abs(struct cyttsp5_tch_abs_params *tch_abs, int report_size,
+			int offset)
+{
+	tch_abs->ofs = offset / 8;
+	tch_abs->size = report_size / 8;
+	if (report_size % 8)
+		tch_abs->size += 1;
+	tch_abs->min = 0;
+	tch_abs->max = 1 << report_size;
+	tch_abs->bofs = offset - (tch_abs->ofs << 3);
+
+	return 0;
+}
+
+static irqreturn_t cyttsp5_handle_irq(int irq, void *handle)
+{
+	struct cyttsp5 *ts = handle;
+	int report_id;
+	int size;
+	int error;
+
+	error = cyttsp5_read(ts, ts->input_buf, CY_MAX_INPUT);
+	if (error)
+		return IRQ_HANDLED;
+
+	size = get_unaligned_le16(&ts->input_buf[0]);
+	if (size == 0) {
+		/* reset */
+		report_id = 0;
+		size = 2;
+	} else {
+		report_id = ts->input_buf[2];
+	}
+
+	switch (report_id) {
+	case HID_TOUCH_REPORT_ID:
+		cyttsp5_mt_attention(ts->dev);
+		break;
+	case HID_BTN_REPORT_ID:
+		cyttsp5_btn_attention(ts->dev);
+		break;
+	default:
+		/* It is not an input but a command response */
+		memcpy(ts->response_buf, ts->input_buf, size);
+		complete(&ts->cmd_done);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int cyttsp5_deassert_int(struct cyttsp5 *ts)
+{
+	u16 size;
+	u8 buf[2];
+	int error;
+
+	error = regmap_bulk_read(ts->regmap, HID_INPUT_REG, buf, sizeof(buf));
+	if (error < 0)
+		return error;
+
+	size = get_unaligned_le16(&buf[0]);
+	if (size == 2 || size == 0)
+		return 0;
+
+	return -EINVAL;
+}
+
+static int cyttsp5_fill_all_touch(struct cyttsp5 *ts)
+{
+	struct cyttsp5_sysinfo *si = &ts->sysinfo;
+
+	fill_tch_abs(&si->tch_abs[CY_TCH_X], REPORT_SIZE_16,
+		     TOUCH_REPORT_DESC_X);
+	fill_tch_abs(&si->tch_abs[CY_TCH_Y], REPORT_SIZE_16,
+		     TOUCH_REPORT_DESC_Y);
+	fill_tch_abs(&si->tch_abs[CY_TCH_P], REPORT_SIZE_8,
+		     TOUCH_REPORT_DESC_P);
+	fill_tch_abs(&si->tch_abs[CY_TCH_T], REPORT_SIZE_5,
+		     TOUCH_REPORT_DESC_CONTACTID);
+	fill_tch_abs(&si->tch_hdr, REPORT_SIZE_5,
+		     TOUCH_REPORT_DESC_HDR_CONTACTCOUNT);
+	fill_tch_abs(&si->tch_abs[CY_TCH_MAJ], REPORT_SIZE_8,
+		     TOUCH_REPORT_DESC_MAJ);
+	fill_tch_abs(&si->tch_abs[CY_TCH_MIN], REPORT_SIZE_8,
+		     TOUCH_REPORT_DESC_MIN);
+
+	return 0;
+}
+
+static int cyttsp5_startup(struct cyttsp5 *ts)
+{
+	int error;
+
+	error = cyttsp5_deassert_int(ts);
+	if (error) {
+		dev_err(ts->dev, "Error on deassert int r=%d\n", error);
+		return -ENODEV;
+	}
+
+	/*
+	 * Launch the application as the device starts in bootloader mode
+	 * because of a power-on-reset
+	 */
+	error = cyttsp5_hid_output_bl_launch_app(ts);
+	if (error < 0) {
+		dev_err(ts->dev, "Error on launch app r=%d\n", error);
+		return error;
+	}
+
+	error = cyttsp5_get_hid_descriptor(ts, &ts->hid_desc);
+	if (error < 0) {
+		dev_err(ts->dev, "Error on getting HID descriptor r=%d\n", error);
+		return error;
+	}
+
+	error = cyttsp5_fill_all_touch(ts);
+	if (error < 0) {
+		dev_err(ts->dev, "Error on report descriptor r=%d\n", error);
+		return error;
+	}
+
+	error = cyttsp5_hid_output_get_sysinfo(ts);
+	if (error) {
+		dev_err(ts->dev, "Error on getting sysinfo r=%d\n", error);
+		return error;
+	}
+
+	return error;
+}
+
+static void cyttsp5_cleanup(void *data)
+{
+	struct cyttsp5 *ts = data;
+
+	regulator_disable(ts->vdd);
+}
+
+static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
+			 const char *name)
+{
+	struct cyttsp5 *ts;
+	struct cyttsp5_sysinfo *si;
+	int error, i;
+
+	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	/* Initialize device info */
+	ts->regmap = regmap;
+	ts->dev = dev;
+	si = &ts->sysinfo;
+	dev_set_drvdata(dev, ts);
+
+	init_completion(&ts->cmd_done);
+
+	/* Power up the device */
+	ts->vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(ts->vdd)) {
+		error = PTR_ERR(ts->vdd);
+		return error;
+	}
+
+	error = devm_add_action_or_reset(dev, cyttsp5_cleanup, ts);
+	if (error) {
+		return error;
+	}
+
+	error = regulator_enable(ts->vdd);
+	if (error) {
+		return error;
+	}
+
+	ts->input = devm_input_allocate_device(dev);
+	if (!ts->input) {
+		dev_err(dev, "Error, failed to allocate input device\n");
+		return -ENODEV;
+	}
+
+	ts->input->name = "cyttsp5";
+	scnprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
+	ts->input->phys = ts->phys;
+	input_set_drvdata(ts->input, ts);
+
+	/* Reset the gpio to be in a reset state */
+	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ts->reset_gpio)) {
+		error = PTR_ERR(ts->reset_gpio);
+		dev_err(dev, "Failed to request reset gpio, error %d\n", error);
+		return error;
+	}
+	gpiod_set_value(ts->reset_gpio, 0);
+
+	/* Need a delay to have device up */
+	msleep(20);
+
+	error = devm_request_threaded_irq(dev, irq, NULL, cyttsp5_handle_irq,
+				       IRQF_ONESHOT, name, ts);
+	if (error) {
+		dev_err(dev, "unable to request IRQ\n");
+		return error;
+	}
+
+	error = cyttsp5_startup(ts);
+	if (error) {
+		dev_err(ts->dev, "Fail initial startup r=%d\n", error);
+		return error;
+	}
+
+	error = cyttsp5_parse_dt_key_code(dev);
+	if (error < 0) {
+		dev_err(ts->dev, "Error while parsing dts %d\n", error);
+		return error;
+	}
+
+	touchscreen_parse_properties(ts->input, true, &ts->prop);
+
+	__set_bit(EV_KEY, ts->input->evbit);
+	for (i = 0; i < si->num_btns; i++)
+		__set_bit(si->key_code[i], ts->input->keybit);
+
+	return cyttsp5_setup_input_device(dev);
+}
+
+static int cyttsp5_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct regmap *regmap;
+	static const struct regmap_config config = {
+		.reg_bits = 8,
+		.val_bits = 8,
+	};
+
+	regmap = devm_regmap_init_i2c(client, &config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "regmap allocation failed: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	return cyttsp5_probe(&client->dev, regmap, client->irq, client->name);
+}
+
+static const struct of_device_id cyttsp5_of_match[] = {
+	{ .compatible = "cypress,tt21000", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cyttsp5_of_match);
+
+static const struct i2c_device_id cyttsp5_i2c_id[] = {
+	{ CYTTSP5_NAME, 0, },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, cyttsp5_i2c_id);
+
+static struct i2c_driver cyttsp5_i2c_driver = {
+	.driver = {
+		.name = CYTTSP5_NAME,
+		.of_match_table = cyttsp5_of_match,
+	},
+	.probe = cyttsp5_i2c_probe,
+	.id_table = cyttsp5_i2c_id,
+};
+module_i2c_driver(cyttsp5_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Touchscreen driver for Cypress TrueTouch Gen 5 Product");
+MODULE_AUTHOR("Mylène Josserand <mylene.josserand@bootlin.com>");