@@ -664,6 +664,18 @@ config TOUCHSCREEN_NOVATEK_NVT_TS
To compile this driver as a module, choose M here: the
module will be called novatek-nvt-ts.
+config TOUCHSCREEN_NT36XXX
+ tristate "Novatek NT36XXX In-Cell I2C touchscreen controller"
+ depends on I2C
+ help
+ Say Y here if you have a Novatek NT36xxx series In-Cell
+ touchscreen connected to your system over I2C.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called nt36xxx.
+
config TOUCHSCREEN_IMAGIS
tristate "Imagis touchscreen support"
depends on I2C
@@ -68,6 +68,7 @@ obj-$(CONFIG_TOUCHSCREEN_MSG2638) += msg2638.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
obj-$(CONFIG_TOUCHSCREEN_NOVATEK_NVT_TS) += novatek-nvt-ts.o
+obj-$(CONFIG_TOUCHSCREEN_NT36XXX) += nt36xxx.o
obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o
obj-$(CONFIG_TOUCHSCREEN_IPAQ_MICRO) += ipaq-micro-ts.o
new file mode 100644
@@ -0,0 +1,847 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Novatek NT36xxx series touchscreens
+ *
+ * Copyright (C) 2010 - 2017 Novatek, Inc.
+ * Copyright (C) 2020 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <asm/unaligned.h>
+
+#include "nt36xxx.h"
+
+/* FW Param address */
+#define NT36XXX_FW_ADDR 0x01
+
+/* Misc */
+#define NT36XXX_NUM_SUPPLIES 2
+#define NT36XXX_MAX_RETRIES 5
+#define NT36XXX_MAX_FW_RST_RETRY 50
+
+/* Touch info */
+#define TOUCH_DEFAULT_MAX_WIDTH 1080
+#define TOUCH_DEFAULT_MAX_HEIGHT 2246
+#define TOUCH_MAX_FINGER_NUM 10
+#define TOUCH_MAX_PRESSURE 1000
+
+/* Point data length */
+#define POINT_DATA_LEN 65
+
+/* Global pages */
+#define NT36XXX_PAGE_CHIP_INFO 0x0001f64e
+#define NT36XXX_PAGE_CRC 0x0003f135
+
+struct nt36xxx_i2c {
+ struct i2c_client *hw_client;
+ struct i2c_client *fw_client;
+ struct regmap *regmap;
+ struct regmap *fw_regmap;
+ struct input_dev *input;
+ struct regulator_bulk_data *supplies;
+ struct gpio_desc *reset_gpio;
+
+ struct mutex lock;
+
+ struct touchscreen_properties prop;
+ struct nt36xxx_fw_info fw_info;
+ struct nt36xxx_abs_object abs_obj;
+
+ const struct nt36xxx_mem_map *mmap;
+};
+
+static const struct nt36xxx_mem_map nt36xxx_memory_maps[] = {
+ [NT36525_IC] = {
+ .evtbuf_addr = 0x11a00,
+ .pipe0_addr = 0x10000,
+ .pipe1_addr = 0x12000,
+ .flash_csum_addr = 0x14000,
+ .flash_data_addr = 0x14002,
+ },
+ [NT36672A_IC] = {
+ .evtbuf_addr = 0x21c00,
+ .pipe0_addr = 0x20000,
+ .pipe1_addr = 0x23000,
+ .flash_csum_addr = 0x24000,
+ .flash_data_addr = 0x24002,
+ },
+ [NT36676F_IC] = {
+ .evtbuf_addr = 0x11a00,
+ .pipe0_addr = 0x10000,
+ .pipe1_addr = 0x12000,
+ .flash_csum_addr = 0x14000,
+ .flash_data_addr = 0x14002,
+ },
+ [NT36772_IC] = {
+ .evtbuf_addr = 0x11e00,
+ .pipe0_addr = 0x10000,
+ .pipe1_addr = 0x12000,
+ .flash_csum_addr = 0x14000,
+ .flash_data_addr = 0x14002,
+ },
+ [NT36870_IC] = {
+ .evtbuf_addr = 0x25000,
+ .pipe0_addr = 0x20000,
+ .pipe1_addr = 0x23000,
+ .flash_csum_addr = 0x24000,
+ .flash_data_addr = 0x24002,
+ },
+};
+
+static const struct nt36xxx_trim_table trim_id_table[] = {
+ {
+ .id = { 0x0a, 0xff, 0xff, 0x72, 0x66, 0x03 },
+ .mask = { 1, 0, 0, 1, 1, 1 },
+ .mapid = NT36672A_IC,
+ },
+ {
+ .id = { 0x55, 0x00, 0xff, 0x00, 0x00, 0x00 },
+ .mask = { 1, 1, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0x55, 0x72, 0xff, 0x00, 0x00, 0x00 },
+ .mask = { 1, 1, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xaa, 0x00, 0xff, 0x00, 0x00, 0x00 },
+ .mask = { 1, 1, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xaa, 0x72, 0xff, 0x00, 0x00, 0x00 },
+ .mask = { 1, 1, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x72, 0x67, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x70, 0x66, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x70, 0x67, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x72, 0x66, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x25, 0x65, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x70, 0x68, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36772_IC,
+ },
+ {
+ .id = { 0xff, 0xff, 0xff, 0x76, 0x66, 0x03 },
+ .mask = { 0, 0, 0, 1, 1, 1 },
+ .mapid = NT36676F_IC,
+ },
+};
+
+/**
+ * nt36xxx_set_page - Set page number for read/write
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_set_page(struct nt36xxx_i2c *ts, u32 pageaddr)
+{
+ u32 data = cpu_to_be32(pageaddr) >> 8;
+ int ret;
+
+ ret = regmap_noinc_write(ts->fw_regmap, NT36XXX_CMD_SET_PAGE,
+ &data, sizeof(data));
+ if (ret)
+ return ret;
+
+ usleep_range(100, 200);
+ return ret;
+}
+
+/**
+ * nt36xxx_sw_reset_idle - Warm restart the firmware
+ * @ts: Main driver structure
+ *
+ * This function restarts the running firmware without rebooting to
+ * the bootloader (warm restart)
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_sw_reset_idle(struct nt36xxx_i2c *ts)
+{
+ int ret;
+
+ ret = regmap_write(ts->regmap, ts->hw_client->addr,
+ NT36XXX_CMD_SW_RESET);
+ if (ret)
+ return ret;
+
+ /* Wait until the MCU resets the fw state */
+ usleep_range(15000, 16000);
+ return ret;
+}
+
+/**
+ * nt36xxx_bootloader_reset - Reset MCU to bootloader
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_bootloader_reset(struct nt36xxx_i2c *ts)
+{
+ int ret;
+
+ ret = regmap_write(ts->regmap, ts->hw_client->addr,
+ NT36XXX_CMD_BOOTLOADER_RESET);
+ if (ret)
+ return ret;
+
+ /* MCU has to reboot from bootloader - this is the typical boot time */
+ msleep(35);
+ return ret;
+}
+
+/**
+ * nt36xxx_check_reset_state - Check the boot state during reset
+ * @ts: Main driver structure
+ * @fw_state: Enumeration containing firmware states
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_check_reset_state(struct nt36xxx_i2c *ts,
+ enum nt36xxx_fw_state fw_state)
+{
+ u8 buf[2] = { 0 };
+ int ret, retry = NT36XXX_MAX_FW_RST_RETRY;
+
+ do {
+ ret = regmap_noinc_read(ts->fw_regmap,
+ NT36XXX_EVT_RESET_COMPLETE,
+ buf, sizeof(buf));
+ if (likely(ret == 0) &&
+ (buf[0] >= fw_state) &&
+ (buf[0] <= NT36XXX_STATE_MAX)) {
+ ret = 0;
+ break;
+ }
+ usleep_range(10000, 11000);
+ } while (--retry);
+
+ if (!retry) {
+ dev_err(&ts->hw_client->dev, "Firmware reset failed.\n");
+ ret = -EBUSY;
+ }
+
+ return ret;
+}
+
+/**
+ * nt36xxx_read_pid - Read Novatek Project ID
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_read_pid(struct nt36xxx_i2c *ts)
+{
+ __be16 pid;
+ int ret;
+
+ ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr);
+ if (ret)
+ return ret;
+
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_PROJECTID,
+ &pid, sizeof(pid));
+ if (ret < 0)
+ return ret;
+
+ ts->fw_info.nvt_pid = be16_to_cpu(pid);
+ return 0;
+}
+
+/**
+ * __nt36xxx_get_fw_info - Get working params from firmware
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int __nt36xxx_get_fw_info(struct nt36xxx_i2c *ts)
+{
+ struct nt36xxx_fw_info *fwi = &ts->fw_info;
+ u8 buf[11] = { 0 };
+ int ret = 0;
+
+ ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr);
+ if (ret)
+ return ret;
+
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_FWINFO,
+ buf, sizeof(buf));
+ if (ret)
+ return ret;
+
+ fwi->fw_ver = buf[0];
+ fwi->x_num = buf[2];
+ fwi->y_num = buf[3];
+ fwi->abs_x_max = get_unaligned_be16(&buf[4]);
+ fwi->abs_y_max = get_unaligned_be16(&buf[6]);
+ fwi->max_buttons = buf[10];
+
+ /* Check fw info integrity and clear x_num, y_num if broken */
+ if ((buf[0] + buf[1]) != 0xFF) {
+ dev_err(&ts->hw_client->dev,
+ "FW info is broken! fw_ver=0x%02X, ~fw_ver=0x%02X\n",
+ buf[0], buf[1]);
+ fwi->fw_ver = 0;
+ fwi->x_num = 18;
+ fwi->y_num = 32;
+ fwi->abs_x_max = TOUCH_DEFAULT_MAX_WIDTH;
+ fwi->abs_y_max = TOUCH_DEFAULT_MAX_HEIGHT;
+ fwi->max_buttons = 0;
+ return -EINVAL;
+ }
+
+ /* Get Novatek ProjectID */
+ return nt36xxx_read_pid(ts);
+}
+
+static int nt36xxx_get_fw_info(struct nt36xxx_i2c *ts)
+{
+ struct nt36xxx_fw_info *fwi = &ts->fw_info;
+ int i, ret = 0;
+
+ for (i = 0; i < NT36XXX_MAX_RETRIES; i++) {
+ ret = __nt36xxx_get_fw_info(ts);
+ if (ret == 0)
+ break;
+ }
+
+ dev_dbg(&ts->hw_client->dev,
+ "FW Info: PID=0x%x, ver=0x%x res=%ux%u max=%ux%u buttons=%u",
+ fwi->nvt_pid, fwi->fw_ver, fwi->x_num, fwi->y_num,
+ fwi->abs_x_max, fwi->abs_y_max, fwi->max_buttons);
+
+ return ret;
+}
+
+/**
+ * nt36xxx_report - Report touch events
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static void nt36xxx_report(struct nt36xxx_i2c *ts)
+{
+ struct nt36xxx_abs_object *obj = &ts->abs_obj;
+ struct input_dev *input = ts->input;
+ u8 input_id = 0;
+ u8 point[POINT_DATA_LEN + 1] = { 0 };
+ unsigned int ppos = 0;
+ int i, ret, finger_cnt = 0;
+
+ mutex_lock(&ts->lock);
+
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_REPORT,
+ point, sizeof(point));
+ if (ret < 0) {
+ dev_err(&ts->hw_client->dev,
+ "Cannot read touch point data: %d\n", ret);
+ goto xfer_error;
+ }
+
+ for (i = 0; i < TOUCH_MAX_FINGER_NUM; i++) {
+ ppos = 6 * i;
+ input_id = point[ppos + 0] >> 3;
+ if ((input_id == 0) || (input_id > TOUCH_MAX_FINGER_NUM))
+ continue;
+
+ if (((point[ppos] & 0x07) == 0x01) ||
+ ((point[ppos] & 0x07) == 0x02)) {
+ obj->x = (point[ppos + 1] << 4) +
+ (point[ppos + 3] >> 4);
+ obj->y = (point[ppos + 2] << 4) +
+ (point[ppos + 3] & 0xf);
+ if ((obj->x > ts->prop.max_x) ||
+ (obj->y > ts->prop.max_y))
+ continue;
+
+ obj->tm = point[ppos + 4];
+ if (obj->tm == 0)
+ obj->tm = 1;
+
+ obj->z = point[ppos + 5];
+ if (i < 2) {
+ obj->z += point[i + 63] << 8;
+ if (obj->z > TOUCH_MAX_PRESSURE)
+ obj->z = TOUCH_MAX_PRESSURE;
+ }
+
+ if (obj->z == 0)
+ obj->z = 1;
+
+ input_mt_slot(input, input_id - 1);
+ input_mt_report_slot_state(input,
+ MT_TOOL_FINGER, true);
+ touchscreen_report_pos(input, &ts->prop, obj->x,
+ obj->y, true);
+
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, obj->tm);
+ input_report_abs(input, ABS_MT_PRESSURE, obj->z);
+
+ finger_cnt++;
+ }
+ }
+ input_mt_sync_frame(input);
+ input_sync(input);
+
+xfer_error:
+ enable_irq(ts->hw_client->irq);
+
+ mutex_unlock(&ts->lock);
+}
+
+static irqreturn_t nt36xxx_i2c_irq_handler(int irq, void *dev_id)
+{
+ struct nt36xxx_i2c *ts = dev_id;
+
+ disable_irq_nosync(ts->hw_client->irq);
+ nt36xxx_report(ts);
+
+ return IRQ_HANDLED;
+}
+
+static bool nt36xxx_in_crc_reboot_loop(u8 *buf)
+{
+ return ((buf[0] == 0xfc) && (buf[1] == 0xfc) && (buf[2] == 0xfc)) ||
+ ((buf[0] == 0xff) && (buf[1] == 0xff) && (buf[2] == 0xff));
+}
+
+/**
+ * nt36xxx_stop_crc_reboot - Stop CRC reboot loop and warm-reboot the firmware
+ * @ts: Main driver structure
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_stop_crc_reboot(struct nt36xxx_i2c *ts)
+{
+ u8 buf[3] = { 0 };
+ u8 val;
+ int ret, retry = NT36XXX_MAX_RETRIES;
+
+ /* Read dummy buffer to check CRC fail reboot is happening or not */
+
+ /* Change I2C index to prevent getting 0xFF, but not 0xFC */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO);
+ if (ret) {
+ dev_dbg(&ts->hw_client->dev,
+ "CRC reset failed: Cannot select page.\n");
+ return ret;
+ }
+
+ /* If ChipID command returns 0xFC or 0xFF, the MCU is in CRC reboot */
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CHIPID,
+ buf, sizeof(buf));
+ if (ret)
+ return ret;
+
+ if (!nt36xxx_in_crc_reboot_loop(buf))
+ return 0;
+
+ /* IC is in CRC fail reboot loop, needs to be stopped! */
+ do {
+ /* Special reset-idle sequence for CRC failure */
+ ret = regmap_write(ts->regmap, ts->hw_client->addr,
+ NT36XXX_CMD_SW_RESET);
+ if (ret)
+ dev_dbg(&ts->hw_client->dev,
+ "SW Reset 1 failed: may not recover\n");
+
+ ret = regmap_write(ts->regmap, ts->hw_client->addr,
+ NT36XXX_CMD_SW_RESET);
+ if (ret)
+ dev_dbg(&ts->hw_client->dev,
+ "SW Reset 2 failed: may not recover\n");
+ usleep_range(1000, 1100);
+
+ /* Clear CRC_ERR_FLAG */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC);
+ if (ret)
+ continue;
+
+ val = 0xa5;
+ ret = regmap_raw_write(ts->fw_regmap, NT36XXX_EVT_CRC,
+ &val, sizeof(val));
+ if (ret)
+ continue;
+
+ /* Check CRC_ERR_FLAG */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC);
+ if (ret)
+ continue;
+
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CRC,
+ &buf, sizeof(buf));
+ if (ret)
+ continue;
+
+ if (buf[0] == 0xa5)
+ break;
+ } while (--retry);
+
+ if (retry == 0) {
+ dev_err(&ts->hw_client->dev,
+ "CRC reset failed: buf=0x%2ph\n", buf);
+ }
+
+ return ret;
+}
+
+/**
+ * nt36xxx_i2c_chip_version_init - Detect Novatek NT36xxx family IC
+ * @ts: Main driver structure
+ *
+ * This function reads the ChipID from the IC and sets the right
+ * memory map for the detected chip.
+ *
+ * Return: Always zero for success, negative number for error
+ */
+static int nt36xxx_i2c_chip_version_init(struct nt36xxx_i2c *ts)
+{
+ u8 buf[7] = { 0 };
+ int retry = NT36XXX_MAX_RETRIES;
+ int sz = sizeof(trim_id_table) / sizeof(struct nt36xxx_trim_table);
+ int i, list, mapid, ret;
+
+ ret = nt36xxx_bootloader_reset(ts);
+ if (ret) {
+ dev_err(&ts->hw_client->dev, "Can't reset the nvt IC\n");
+ return ret;
+ }
+
+ do {
+ ret = nt36xxx_sw_reset_idle(ts);
+ if (ret)
+ continue;
+
+ ret = regmap_write(ts->regmap, ts->hw_client->addr, NT36XXX_CMD_UNLOCK);
+ if (ret)
+ continue;
+ usleep_range(10000, 11000);
+
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO);
+ if (ret)
+ continue;
+
+ memset(buf, 0, ARRAY_SIZE(buf));
+ ret = regmap_noinc_read(ts->fw_regmap, NT36XXX_EVT_CHIPID,
+ buf, sizeof(buf));
+ if (ret)
+ continue;
+
+ /* Compare read chip id with trim list */
+ for (list = 0; list < sz; list++) {
+ /* Compare each not masked byte */
+ for (i = 0; i < NT36XXX_ID_LEN_MAX; i++) {
+ if (trim_id_table[list].mask[i] &&
+ buf[i] != trim_id_table[list].id[i])
+ break;
+ }
+
+ if (i == NT36XXX_ID_LEN_MAX) {
+ mapid = trim_id_table[list].mapid;
+ ts->mmap = &nt36xxx_memory_maps[mapid];
+ return 0;
+ }
+
+ ts->mmap = NULL;
+ ret = -ENOENT;
+ }
+
+ /* Stop CRC check to prevent IC auto reboot */
+ if (nt36xxx_in_crc_reboot_loop(buf)) {
+ ret = nt36xxx_stop_crc_reboot(ts);
+ if (ret)
+ continue;
+ }
+
+ usleep_range(10000, 11000);
+ } while (--retry);
+
+ return ret;
+}
+
+static const struct regmap_config nt36xxx_i2c_regmap_hw_config = {
+ .name = "nt36xxx_i2c_hw",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_NONE,
+};
+
+static const struct regmap_config nt36xxx_i2c_regmap_fw_config = {
+ .name = "nt36xxx_i2c_fw",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_NONE,
+};
+
+static void nt36xxx_disable_regulators(void *data)
+{
+ struct nt36xxx_i2c *ts = data;
+
+ regulator_bulk_disable(NT36XXX_NUM_SUPPLIES, ts->supplies);
+}
+
+static int nt36xxx_i2c_probe(struct i2c_client *hw_client)
+{
+ struct nt36xxx_i2c *ts;
+ struct input_dev *input;
+ int ret;
+
+ if (!i2c_check_functionality(hw_client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&hw_client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ if (!hw_client->irq) {
+ dev_err(&hw_client->dev, "No irq specified\n");
+ return -EINVAL;
+ }
+
+ ts = devm_kzalloc(&hw_client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->supplies = devm_kcalloc(&hw_client->dev,
+ NT36XXX_NUM_SUPPLIES,
+ sizeof(*ts->supplies),
+ GFP_KERNEL);
+ if (!ts->supplies)
+ return -ENOMEM;
+
+ input = devm_input_allocate_device(&hw_client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ ts->fw_client = i2c_new_dummy_device(hw_client->adapter,
+ NT36XXX_FW_ADDR);
+ if (IS_ERR(ts->fw_client)) {
+ dev_err(&hw_client->dev, "Cannot add FW I2C device\n");
+ return PTR_ERR(ts->fw_client);
+ }
+
+ ts->hw_client = hw_client;
+ ts->input = input;
+ i2c_set_clientdata(ts->hw_client, ts);
+ i2c_set_clientdata(ts->fw_client, ts);
+
+ ts->reset_gpio = devm_gpiod_get_optional(&hw_client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(ts->reset_gpio))
+ return PTR_ERR(ts->reset_gpio);
+ gpiod_set_consumer_name(ts->reset_gpio, "nt36xxx reset");
+
+ /* These supplies are optional */
+ ts->supplies[0].supply = "vdd";
+ ts->supplies[1].supply = "vio";
+ ret = devm_regulator_bulk_get(&hw_client->dev,
+ NT36XXX_NUM_SUPPLIES,
+ ts->supplies);
+ if (ret)
+ return dev_err_probe(&hw_client->dev, ret,
+ "Cannot get supplies: %d\n", ret);
+
+ ts->regmap = devm_regmap_init_i2c(ts->hw_client,
+ &nt36xxx_i2c_regmap_hw_config);
+ if (IS_ERR(ts->regmap)) {
+ dev_err(&hw_client->dev, "regmap (hw-addr) init failed\n");
+ return PTR_ERR(ts->regmap);
+ }
+
+ ts->fw_regmap = devm_regmap_init_i2c(ts->fw_client,
+ &nt36xxx_i2c_regmap_fw_config);
+ if (IS_ERR(ts->fw_regmap)) {
+ dev_err(&hw_client->dev, "regmap (fw-addr) init failed\n");
+ return PTR_ERR(ts->fw_regmap);
+ }
+
+ ret = regulator_bulk_enable(NT36XXX_NUM_SUPPLIES, ts->supplies);
+ if (ret)
+ return ret;
+
+ usleep_range(10000, 11000);
+
+ ret = devm_add_action_or_reset(&hw_client->dev,
+ nt36xxx_disable_regulators, ts);
+ if (ret)
+ return ret;
+
+ mutex_init(&ts->lock);
+
+ /* Set memory maps for the specific chip version */
+ ret = nt36xxx_i2c_chip_version_init(ts);
+ if (ret) {
+ dev_err(&hw_client->dev, "Failed to check chip version\n");
+ return ret;
+ }
+
+ /* Reset the MCU */
+ ret = nt36xxx_bootloader_reset(ts);
+ if (ret < 0)
+ return ret;
+
+ /* Check and eventually wait until the MCU goes in reset state */
+ ret = nt36xxx_check_reset_state(ts, NT36XXX_STATE_INIT);
+ if (ret < 0)
+ return ret;
+
+ /* Get information from the TS firmware */
+ ret = nt36xxx_get_fw_info(ts);
+ if (ret < 0)
+ return ret;
+
+ input->phys = devm_kasprintf(&hw_client->dev, GFP_KERNEL,
+ "%s/input0", dev_name(&hw_client->dev));
+ if (!input->phys)
+ return -ENOMEM;
+
+ input->name = "Novatek NT36XXX Touchscreen";
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = &hw_client->dev;
+
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(EV_ABS, input->evbit);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
+
+ ret = input_mt_init_slots(input, TOUCH_MAX_FINGER_NUM,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (ret) {
+ dev_err(&hw_client->dev, "Cannot init MT slots (%d)\n", ret);
+ return ret;
+ }
+
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0,
+ TOUCH_MAX_PRESSURE, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
+ ts->fw_info.abs_x_max - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
+ ts->fw_info.abs_y_max - 1, 0, 0);
+
+ /* Override the firmware defaults, if needed */
+ touchscreen_parse_properties(input, true, &ts->prop);
+
+ input_set_drvdata(input, ts);
+
+ ret = input_register_device(ts->input);
+ if (ret) {
+ dev_err(&hw_client->dev, "Failed to register input device: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&hw_client->dev, hw_client->irq, NULL,
+ nt36xxx_i2c_irq_handler, IRQF_ONESHOT,
+ hw_client->name, ts);
+ if (ret) {
+ dev_err(&hw_client->dev, "request irq failed: %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+static int __maybe_unused nt36xxx_i2c_suspend(struct device *dev)
+{
+ struct nt36xxx_i2c *ts = i2c_get_clientdata(to_i2c_client(dev));
+ int ret;
+
+ disable_irq(ts->hw_client->irq);
+
+ ret = regmap_write(ts->fw_regmap, NT36XXX_EVT_HOST_CMD,
+ NT36XXX_CMD_ENTER_SLEEP);
+ if (ret) {
+ dev_err(&ts->hw_client->dev, "Cannot enter suspend!!\n");
+ return ret;
+ }
+
+ gpiod_set_value(ts->reset_gpio, 1);
+
+ return 0;
+}
+
+static int __maybe_unused nt36xxx_i2c_resume(struct device *dev)
+{
+ struct nt36xxx_i2c *ts = i2c_get_clientdata(to_i2c_client(dev));
+ int ret;
+
+ mutex_lock(&ts->lock);
+
+ gpiod_set_value(ts->reset_gpio, 0);
+
+ /* Reboot the MCU (also recalibrates the TS) */
+ ret = nt36xxx_bootloader_reset(ts);
+ if (ret < 0)
+ goto end;
+
+ ret = nt36xxx_check_reset_state(ts, NT36XXX_STATE_REK);
+ if (ret < 0)
+ goto end;
+
+ enable_irq(ts->hw_client->irq);
+end:
+ mutex_unlock(&ts->lock);
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(nt36xxx_i2c_pm,
+ nt36xxx_i2c_suspend, nt36xxx_i2c_resume);
+
+static const struct of_device_id nt36xxx_of_match[] = {
+ { .compatible = "novatek,nt36525-i2c" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, nt36xxx_of_match);
+
+static const struct i2c_device_id nt36xxx_i2c_ts_id[] = {
+ { "NVT-ts", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, nt36xxx_i2c_ts_id);
+
+static struct i2c_driver nt36xxx_i2c_ts_driver = {
+ .driver = {
+ .name = "nt36xxx_ts",
+ .pm = pm_ptr(&nt36xxx_i2c_pm),
+ .of_match_table = nt36xxx_of_match,
+ },
+ .id_table = nt36xxx_i2c_ts_id,
+ .probe = nt36xxx_i2c_probe,
+};
+module_i2c_driver(nt36xxx_i2c_ts_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Novatek NT36XXX Touchscreen Driver");
+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
new file mode 100644
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2010 - 2017 Novatek, Inc.
+ * Copyright (C) 2020 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+ */
+
+#ifndef NT36XXX_H
+#define NT36XXX_H
+
+/* Number of bytes for chip identification */
+#define NT36XXX_ID_LEN_MAX 6
+
+struct nt36xxx_abs_object {
+ u16 x;
+ u16 y;
+ u16 z;
+ u8 tm;
+};
+
+struct nt36xxx_fw_info {
+ u8 fw_ver;
+ u8 x_num;
+ u8 y_num;
+ u8 max_buttons;
+ u16 abs_x_max;
+ u16 abs_y_max;
+ u16 nvt_pid;
+};
+
+struct nt36xxx_mem_map {
+ u32 evtbuf_addr;
+ u32 pipe0_addr;
+ u32 pipe1_addr;
+ u32 flash_csum_addr;
+ u32 flash_data_addr;
+};
+
+enum nt36xxx_chips {
+ NT36525_IC = 0,
+ NT36672A_IC,
+ NT36676F_IC,
+ NT36772_IC,
+ NT36870_IC,
+ NTMAX_IC,
+};
+
+struct nt36xxx_trim_table {
+ u8 id[NT36XXX_ID_LEN_MAX];
+ u8 mask[NT36XXX_ID_LEN_MAX];
+ enum nt36xxx_chips mapid;
+};
+
+/**
+ * enum nt36xxx_fw_state - Firmware state
+ * @NT36XXX_STATE_INIT: IC Reset
+ * @NT36XXX_STATE_REK: ReK baseline
+ * @NT36XXX_STATE_REK_FINISH: Baseline is ready
+ * @NT36XXX_STATE_NORMAL_RUN: Firmware is running
+ */
+enum nt36xxx_cmds {
+ NT36XXX_CMD_ENTER_SLEEP = 0x11,
+ NT36XXX_CMD_ENTER_WKUP_GESTURE = 0x13,
+ NT36XXX_CMD_UNLOCK = 0x35,
+ NT36XXX_CMD_BOOTLOADER_RESET = 0x69,
+ NT36XXX_CMD_SW_RESET = 0xa5,
+ NT36XXX_CMD_SET_PAGE = 0xff,
+};
+
+enum nt36xxx_fw_state {
+ NT36XXX_STATE_INIT = 0xa0, /* IC reset */
+ NT36XXX_STATE_REK, /* ReK baseline */
+ NT36XXX_STATE_REK_FINISH, /* Baseline is ready */
+ NT36XXX_STATE_NORMAL_RUN, /* Normal run */
+ NT36XXX_STATE_MAX = 0xaf
+};
+
+enum nt36xxx_events {
+ NT36XXX_EVT_REPORT = 0x00,
+ NT36XXX_EVT_CRC = 0x35,
+ NT36XXX_EVT_CHIPID = 0x4e,
+ NT36XXX_EVT_HOST_CMD = 0x50,
+ NT36XXX_EVT_HS_OR_SUBCMD = 0x51, /* Handshake or subcommand byte */
+ NT36XXX_EVT_RESET_COMPLETE = 0x60,
+ NT36XXX_EVT_FWINFO = 0x78,
+ NT36XXX_EVT_PROJECTID = 0x9a,
+
+};
+
+#endif