@@ -605,6 +605,18 @@ config TOUCHSCREEN_MTOUCH
To compile this driver as a module, choose M here: the
module will be called mtouch.
+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_IMX6UL_TSC
tristate "Freescale i.MX6UL touchscreen controller"
depends on (OF && GPIOLIB) || COMPILE_TEST
@@ -61,6 +61,7 @@ obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
obj-$(CONFIG_TOUCHSCREEN_MMS114) += mms114.o
obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.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 +1,741 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2010 - 2017 Novatek, Inc.
+ * Copyright (C) 2020 AngeloGioacchino Del Regno <kholk11@gmail.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/input/mt.h>
+#include <linux/regulator/consumer.h>
+
+#include "nt36xxx.h"
+
+const struct nt36xxx_mem_map nt36xxx_memory_maps[] = {
+ [NT36525_IC] = { 0x11a00, 0x10000, 0x12000, 0x14000, 0x14002 },
+ [NT36672A_IC] = { 0x21c00, 0x20000, 0x23000, 0x24000, 0x24002 },
+ [NT36676F_IC] = { 0x11a00, 0x10000, 0x12000, 0x14000, 0x14002 },
+ [NT36772_IC] = { 0x11e00, 0x10000, 0x12000, 0x14000, 0x14002 },
+ [NT36870_IC] = { 0x25000, 0x20000, 0x23000, 0x24000, 0x24002 },
+};
+
+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,
+ },
+};
+
+static int nt36xxx_read(struct i2c_client *client, uint16_t address,
+ u8 *buf, uint16_t len)
+{
+ int ret, retry = NT36XXX_MAX_RETRIES;
+ struct i2c_msg msg[] = {
+ /* Write slave position to i2c devices */
+ {
+ .addr = address,
+ .len = 1,
+ .buf = &buf[0]
+ },
+ /* Read data from position */
+ {
+ .addr = address,
+ .flags = I2C_M_RD,
+ .len = len - 1,
+ .buf = &buf[1]
+ }
+ };
+
+ do {
+ ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+ if (likely(ret == ARRAY_SIZE(msg)))
+ return 0;
+ } while (--retry);
+
+ return ret < 0 ? ret : -EIO;
+}
+
+static int nt36xxx_write(struct i2c_client *client, uint16_t address,
+ u8 *buf, uint16_t len)
+{
+ int ret, retry = NT36XXX_MAX_RETRIES;
+ struct i2c_msg msg[] = {
+ {
+ .addr = address,
+ .flags = 0,
+ .len = len,
+ .buf = buf,
+ },
+ };
+
+ do {
+ ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+ if (likely(ret == ARRAY_SIZE(msg)))
+ return 0;
+
+ usleep_range(100, 200);
+ } while (--retry);
+
+ return ret < 0 ? ret : -EIO;
+}
+
+static int nt36xxx_set_page(struct nt36xxx_i2c *ts, uint32_t pageaddr)
+{
+ u8 buf[3];
+
+ buf[0] = NT36XXX_CMD_SET_PAGE;
+ buf[1] = (pageaddr >> 16) & 0xFF;
+ buf[2] = (pageaddr >> 8) & 0xFF;
+
+ return nt36xxx_write(ts->client, NT36XXX_BLDR_ADDR, buf, 3);
+}
+
+static int nt36xxx_sw_reset_idle(struct nt36xxx_i2c *ts)
+{
+ u8 buf[] = { 0x00, NT36XXX_CMD_SW_RESET };
+ int ret;
+
+ ret = nt36xxx_write(ts->client, ts->client->addr,
+ buf, ARRAY_SIZE(buf));
+
+ usleep_range(15000, 16000);
+ return ret;
+}
+
+static int nt36xxx_bootloader_reset(struct nt36xxx_i2c *ts)
+{
+ u8 buf[] = { 0x00, NT36XXX_CMD_BOOTLOADER_RESET };
+ int ret;
+
+ ret = nt36xxx_write(ts->client, ts->client->addr,
+ buf, ARRAY_SIZE(buf));
+
+ msleep(35);
+ return ret;
+}
+
+static int nt36xxx_check_reset_state(struct nt36xxx_i2c *ts,
+ enum nt36xxx_fw_state fw_state)
+{
+ u8 buf[6] = { NT36XXX_EVT_RESET_COMPLETE, 0x00, 0x00,
+ 0x00, 0x00, 0x00 };
+ int ret, retry = NT36XXX_MAX_FW_RST_RETRY;
+
+ do {
+ ret = nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 6);
+ if (likely(ret != -EIO) &&
+ (buf[1] >= fw_state) &&
+ (buf[1] <= NT36XXX_STATE_MAX)) {
+ ret = 0;
+ break;
+ }
+ usleep_range(10000, 11000);
+ } while (--retry);
+
+ if (!retry) {
+ dev_err(&ts->client->dev, "Firmware reset failed.\n");
+ ret = -EBUSY;
+ }
+
+ return ret;
+}
+
+static int nt36xxx_read_pid(struct nt36xxx_i2c *ts)
+{
+ u8 buf[] = { NT36XXX_EVT_PROJECTID, 0x00, 0x00 };
+ int ret = 0;
+
+ ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr);
+ if (unlikely(ret < 0))
+ return ret;
+
+ /* Read project id */
+ ret = nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR,
+ buf, ARRAY_SIZE(buf));
+ if (unlikely(ret < 0))
+ return ret;
+
+ ts->fw_info.nvt_pid = (buf[2] << 8) + buf[1];
+
+ return 0;
+}
+
+static int __nt36xxx_get_fw_info(struct nt36xxx_i2c *ts)
+{
+ struct nt36xxx_fw_info *fwi = &ts->fw_info;
+ u8 buf[17] = { 0 };
+ int ret = 0;
+
+ ret = nt36xxx_set_page(ts, ts->mmap->evtbuf_addr);
+ if (unlikely(ret < 0))
+ return ret;
+
+ /* Read fw info */
+ buf[0] = NT36XXX_EVT_FWINFO;
+ nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 17);
+ fwi->fw_ver = buf[1];
+ fwi->x_num = buf[3];
+ fwi->y_num = buf[4];
+ fwi->abs_x_max = (uint16_t)((buf[5] << 8) | buf[6]);
+ fwi->abs_y_max = (uint16_t)((buf[7] << 8) | buf[8]);
+ fwi->max_buttons = buf[11];
+
+ /* Check fw info integrity and clear x_num, y_num if broken */
+ if ((buf[1] + buf[2]) != 0xFF) {
+ dev_dbg(&ts->client->dev,
+ "FW info is broken! fw_ver=0x%02X, ~fw_ver=0x%02X\n",
+ buf[1], buf[2]);
+ 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->client->dev,
+ "Firmware Info: ver=0x%x res=%ux%u max=%ux%u buttons=%u",
+ fwi->fw_ver, fwi->x_num, fwi->y_num,
+ fwi->abs_x_max, fwi->abs_y_max, fwi->max_buttons);
+
+ return ret;
+}
+
+static void nt36xxx_i2c_work_func(struct work_struct *work)
+{
+ struct nt36xxx_i2c *ts = container_of(work, struct nt36xxx_i2c, ts_work);
+ struct nt36xxx_abs_object *obj = &ts->abs_obj;
+ struct input_dev *input = ts->input;
+ u8 input_id = 0;
+ u8 press_id[TOUCH_MAX_FINGER_NUM] = { 0 };
+ u8 point[POINT_DATA_LEN + 1] = { 0 };
+ unsigned int ppos = 0;
+ int i, ret, finger_cnt = 0;
+
+ mutex_lock(&ts->lock);
+
+ ret = nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, point,
+ POINT_DATA_LEN + 1);
+ if (unlikely(ret < 0)) {
+ dev_dbg(&ts->client->dev,
+ "Cannot read touch point data: %d\n", ret);
+ goto xfer_error;
+ }
+
+ for (i = 0; i < ts->max_fingers; i++) {
+ ppos = 1 + 6 * i;
+ input_id = point[ppos + 0] >> 3;
+ if ((input_id == 0) || (input_id > ts->max_fingers))
+ 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->fw_info.abs_x_max) ||
+ (obj->y > ts->fw_info.abs_y_max))
+ 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;
+
+ press_id[input_id - 1] = 1;
+ input_mt_slot(input, input_id - 1);
+ input_mt_report_slot_state(input,
+ MT_TOOL_FINGER, true);
+
+ input_report_abs(input, ABS_MT_POSITION_X, obj->x);
+ input_report_abs(input, ABS_MT_POSITION_Y, obj->y);
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, obj->tm);
+ input_report_abs(input, ABS_MT_PRESSURE, obj->z);
+
+ finger_cnt++;
+ }
+ }
+
+ for (i = 0; i < ts->max_fingers; i++) {
+ if (press_id[i] != 1) {
+ input_mt_slot(input, i);
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, 0);
+ input_report_abs(input, ABS_MT_PRESSURE, 0);
+ input_mt_report_slot_state(input,
+ MT_TOOL_FINGER, false);
+ }
+ }
+
+ input_report_key(input, BTN_TOUCH, (finger_cnt > 0));
+
+ input_sync(input);
+
+xfer_error:
+ enable_irq(ts->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->client->irq);
+ queue_work(ts->ts_workq, &ts->ts_work);
+
+ return IRQ_HANDLED;
+}
+
+static int nvt_stop_crc_reboot(struct nt36xxx_i2c *ts)
+{
+ u8 buf[3] = { 0 };
+ int ret, retry = NT36XXX_MAX_RETRIES;
+
+ /* Read dummy buffer to check CRC fail reboot is happening or not */
+
+ /* Change I2C index to prevent geting 0xFF, but not 0xFC */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO);
+ if (ret < 0) {
+ dev_dbg(&ts->client->dev,
+ "CRC reset failed: Cannot select page.\n");
+ return ret;
+ }
+
+ /* Read to check if buf is 0xFC which means IC is in CRC reboot */
+ buf[0] = 0x4E;
+ ret = nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 3);
+ if (ret < 0)
+ return ret;
+
+ if (((buf[1] == 0xFC) && (buf[2] == 0xFC) && (buf[3] == 0xFC)) ||
+ ((buf[1] == 0xFF) && (buf[2] == 0xFF) && (buf[3] == 0xFF))) {
+ /* IC is in CRC fail reboot loop, needs to be stopped! */
+ do {
+ /* Write i2c cmds to reset idle - part #1 */
+ buf[0] = 0x00;
+ buf[1] = 0xA5;
+ nt36xxx_write(ts->client, ts->client->addr,
+ buf, 2);
+
+ /* Write i2c cmds to reset idle - part #2 */
+ buf[0] = 0x00;
+ buf[1] = 0xA5;
+ nt36xxx_write(ts->client, ts->client->addr,
+ buf, 2);
+ usleep_range(1000, 1100);
+
+ /* Clear CRC_ERR_FLAG */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC);
+ if (ret < 0)
+ continue;
+
+ buf[0] = 0x35;
+ buf[1] = 0xA5;
+ nt36xxx_write(ts->client, NT36XXX_BLDR_ADDR, buf, 2);
+
+ /* Check CRC_ERR_FLAG */
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CRC);
+ if (ret < 0)
+ continue;
+
+ buf[0] = 0x35;
+ buf[1] = 0x00;
+ nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 2);
+
+ if (buf[1] == 0xA5)
+ break;
+ } while (--retry);
+
+ if (retry == 0) {
+ dev_err(&ts->client->dev,
+ "CRC reset failed: buf[1]=0x%02X\n", buf[1]);
+ }
+ }
+
+ return 0;
+}
+
+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 < 0) {
+ dev_err(&ts->client->dev, "Can't reset the nvt IC\n");
+ return ret;
+ }
+
+ do {
+ ret = nt36xxx_sw_reset_idle(ts);
+ if (ret < 0)
+ continue;
+
+ buf[0] = 0x00;
+ buf[1] = NT36XXX_CMD_UNLOCK;
+ nt36xxx_write(ts->client, ts->client->addr, buf, 2);
+ usleep_range(10000, 11000);
+
+ ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO);
+ if (ret < 0)
+ continue;
+
+ memset(buf, 0, ARRAY_SIZE(buf));
+ buf[0] = NT36XXX_EVT_CHIPID;
+ nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 7);
+
+ /* 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 + 1] != 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 (((buf[1] == 0xFC) && (buf[2] == 0xFC) &&
+ (buf[3] == 0xFC)) ||
+ ((buf[1] == 0xFF) && (buf[2] == 0xFF) &&
+ (buf[3] == 0xFF))) {
+ ret = nvt_stop_crc_reboot(ts);
+ if (ret < 0)
+ continue;
+ }
+
+ usleep_range(10000, 11000);
+ } while (--retry);
+
+ return ret;
+}
+
+static int nt36xxx_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct nt36xxx_i2c *ts;
+ struct input_dev *input;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ if (!client->irq) {
+ dev_err(&client->dev, "No irq specified\n");
+ return -EINVAL;
+ }
+
+ ts = devm_kzalloc(&client->dev, sizeof(struct nt36xxx_i2c), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->supplies = devm_kcalloc(&client->dev,
+ NT36XXX_NUM_SUPPLIES,
+ sizeof(struct regulator_bulk_data),
+ GFP_KERNEL);
+ if (!ts->supplies)
+ return -ENOMEM;
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ ts->client = client;
+ ts->input = input;
+ i2c_set_clientdata(client, ts);
+
+ ts->ts_workq = alloc_ordered_workqueue("nt36xxx", 0);
+ if (!ts->ts_workq)
+ return -EINVAL;
+
+ ts->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(ts->reset_gpio))
+ return PTR_ERR(ts->reset_gpio);
+ if (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(&client->dev,
+ NT36XXX_NUM_SUPPLIES,
+ ts->supplies);
+ if (ret != 0) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&client->dev, "Cannot get supplies: %d\n", ret);
+ return ret;
+ }
+
+ ret = regulator_bulk_enable(NT36XXX_NUM_SUPPLIES, ts->supplies);
+ if (ret)
+ return ret;
+
+ usleep_range(10000, 11000);
+
+ mutex_init(&ts->lock);
+
+ ret = nt36xxx_i2c_chip_version_init(ts);
+ if (ret) {
+ dev_err(&client->dev, "Failed to check chip version\n");
+ goto error;
+ }
+
+ mutex_lock(&ts->lock);
+ ret = nt36xxx_bootloader_reset(ts);
+ ret += nt36xxx_check_reset_state(ts, NT36XXX_STATE_INIT);
+ ret += nt36xxx_get_fw_info(ts);
+ mutex_unlock(&ts->lock);
+ if (unlikely(ret < 0))
+ goto error;
+
+ ts->max_fingers = TOUCH_MAX_FINGER_NUM;
+ INIT_WORK(&ts->ts_work, nt36xxx_i2c_work_func);
+
+ input->phys = devm_kasprintf(&client->dev, GFP_KERNEL,
+ "%s/input0", dev_name(&client->dev));
+
+ input->name = NT36XXX_INPUT_DEVICE_NAME;
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = &client->dev;
+
+ input->evbit[0] =
+ BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+ input->propbit[0] = BIT(INPUT_PROP_DIRECT);
+
+ input_mt_init_slots(input, ts->max_fingers, 0);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0,
+ TOUCH_MAX_PRESSURE, 0, 0);
+
+ if (ts->max_fingers > 1) {
+ 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);
+ }
+
+ input_set_drvdata(input, ts);
+
+ ret = input_register_device(ts->input);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register input device: %d\n",
+ ret);
+ goto error;
+ }
+
+ ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ nt36xxx_i2c_irq_handler, IRQF_ONESHOT,
+ client->name, ts);
+ if (ret != 0) {
+ dev_err(&client->dev, "request irq failed: %d\n", ret);
+ goto intr_error;
+ }
+
+ disable_irq(client->irq);
+ device_init_wakeup(&client->dev, 1);
+ enable_irq(client->irq);
+
+ return 0;
+
+intr_error:
+ input_unregister_device(ts->input);
+error:
+ regulator_bulk_disable(NT36XXX_NUM_SUPPLIES, ts->supplies);
+ return ret;
+}
+
+static int nt36xxx_i2c_remove(struct i2c_client *client)
+{
+ struct nt36xxx_i2c *ts = i2c_get_clientdata(client);
+
+ free_irq(client->irq, ts);
+ regulator_bulk_disable(NT36XXX_NUM_SUPPLIES, ts->supplies);
+ mutex_destroy(&ts->lock);
+ input_unregister_device(ts->input);
+
+ return 0;
+}
+
+static int __maybe_unused nt36xxx_i2c_suspend(struct device *dev)
+{
+ struct nt36xxx_i2c *ts = i2c_get_clientdata(to_i2c_client(dev));
+ u8 buf[] = { NT36XXX_EVT_HOST_CMD, NT36XXX_CMD_ENTER_SLEEP };
+ int i, ret;
+
+ disable_irq(ts->client->irq);
+
+ ret = nt36xxx_write(ts->client, NT36XXX_BLDR_ADDR,
+ buf, ARRAY_SIZE(buf));
+ if (unlikely(ret < 0)) {
+ dev_err(&ts->client->dev, "Cannot enter suspend!!\n");
+ return ret;
+ }
+
+ /* Release all touches */
+ for (i = 0; i < ts->max_fingers; i++) {
+ input_mt_slot(ts->input, i);
+ input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, 0);
+ input_report_abs(ts->input, ABS_MT_PRESSURE, 0);
+ input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 0);
+ }
+ input_sync(ts->input);
+
+ 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);
+
+ if (ts->reset_gpio)
+ gpiod_set_value(ts->reset_gpio, 1);
+
+ 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->client->irq);
+end:
+ mutex_unlock(&ts->lock);
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(nt36xxx_i2c_pm,
+ nt36xxx_i2c_suspend, nt36xxx_i2c_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id nt36xxx_of_match[] = {
+ { .compatible = "novatek,nt36xxx" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, nt36xxx_of_match);
+#endif
+
+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",
+ .of_match_table = of_match_ptr(nt36xxx_of_match),
+ .pm = &nt36xxx_i2c_pm,
+ },
+ .probe = nt36xxx_i2c_probe,
+ .remove = nt36xxx_i2c_remove,
+ .id_table = nt36xxx_i2c_ts_id,
+};
+module_i2c_driver(nt36xxx_i2c_ts_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Novatek NT36XXX Touchscreen Driver");
new file mode 100644
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2010 - 2017 Novatek, Inc.
+ * Copyright (C) 2020 AngeloGioacchino Del Regno <kholk11@gmail.com>
+ */
+
+#ifndef NT36XXX_H
+#define NT36XXX_H
+
+#define NT36XXX_INPUT_DEVICE_NAME "Novatek NT36XXX Touch Sensor"
+
+/* These chips have this fixed address when in bootloader :( */
+#define NT36XXX_BLDR_ADDR 0x01
+
+/* Input device info */
+#define NVT_TS_NAME "NVTCapacitiveTouchScreen"
+
+/* Number of bytes for chip identification */
+#define NT36XXX_ID_LEN_MAX 6
+
+/* 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
+
+/* Misc */
+#define NT36XXX_NUM_SUPPLIES 2
+#define NT36XXX_MAX_RETRIES 5
+#define NT36XXX_MAX_FW_RST_RETRY 50
+
+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;
+};
+
+struct nt36xxx_i2c {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct regulator_bulk_data *supplies;
+ struct gpio_desc *reset_gpio;
+
+ struct work_struct ts_work;
+ struct workqueue_struct *ts_workq;
+ struct mutex lock;
+
+ struct nt36xxx_fw_info fw_info;
+ struct nt36xxx_abs_object abs_obj;
+
+ const struct nt36xxx_mem_map *mmap;
+ u8 max_fingers;
+};
+
+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_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_i2c_events {
+ 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