The stmfts (ST-Microelectronics FingerTip S) touchscreen device
is a capacitive multi-touch controller mainly for mobile use.
It's connected through i2c bus at the address 0x49 and it
interfaces with userspace through input event interface.
At the current state it provides a touchscreen multitouch
functionality up to 10 fingers. Each finger is enumerated with a
distinctive id (from 0 to 9).
If enabled the device can support single "touch" hovering, by
providing three coordinates, x, y and distance.
It is possible to select the touchkey functionality which
provides a basic two keys interface for "home" and "back" menu,
typical in mobile phones.
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/stmfts.c | 805 +++++++++++++++++++++++++++++++++++++
3 files changed, 818 insertions(+)
create mode 100644 drivers/input/touchscreen/stmfts.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 33c62e5de4fa..f8631c64290d 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1114,6 +1114,18 @@ config TOUCHSCREEN_ST1232
To compile this driver as a module, choose M here: the
module will be called st1232_ts.
+config TOUCHSCREEN_STMFTS
+ tristate "STMicroelectronics STMFTS touchscreen"
+ depends on I2C
+ depends on INPUT
+ depends on LEDS_CLASS
+ help
+ Say Y here if you want support for STMicroelectronics
+ STMFTS touchscreen.
+
+ To compile this driver as a module, choose M here: the
+ module will be called stmfts.
+
config TOUCHSCREEN_STMPE
tristate "STMicroelectronics STMPE touchscreens"
depends on MFD_STMPE
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 18e476948e44..6badce87037b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o
obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
+obj-$(CONFIG_TOUCHSCREEN_STMFTS) += stmfts.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
new file mode 100644
index 000000000000..2e18b1456f42
--- /dev/null
+++ b/drivers/input/touchscreen/stmfts.c
@@ -0,0 +1,805 @@
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ * Author: Andi Shyti <andi.shyti@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * STMicroelectronics FTS Touchscreen device driver
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+
+/* I2C commands */
+#define STMFTS_READ_INFO 0x80
+#define STMFTS_READ_STATUS 0x84
+#define STMFTS_READ_ONE_EVENT 0x85
+#define STMFTS_READ_ALL_EVENT 0x86
+#define STMFTS_LATEST_EVENT 0x87
+#define STMFTS_SLEEP_IN 0x90
+#define STMFTS_SLEEP_OUT 0x91
+#define STMFTS_MS_MT_SENSE_OFF 0x92
+#define STMFTS_MS_MT_SENSE_ON 0x93
+#define STMFTS_SS_HOVER_SENSE_OFF 0x94
+#define STMFTS_SS_HOVER_SENSE_ON 0x95
+#define STMFTS_MS_KEY_SENSE_OFF 0x9a
+#define STMFTS_MS_KEY_SENSE_ON 0x9b
+#define STMFTS_SYSTEM_RESET 0xa0
+#define STMFTS_CLEAR_EVENT_STACK 0xa1
+#define STMFTS_FULL_FORCE_CALIBRATION 0xa2
+#define STMFTS_MS_CX_TUNING 0xa3
+#define STMFTS_SS_CX_TUNING 0xa4
+
+/* events */
+#define STMFTS_EV_NO_EVENT 0x00
+#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
+#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
+#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
+#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
+#define STMFTS_EV_HOVER_ENTER 0x07
+#define STMFTS_EV_HOVER_LEAVE 0x08
+#define STMFTS_EV_HOVER_MOTION 0x09
+#define STMFTS_EV_KEY_STATUS 0x0e
+#define STMFTS_EV_ERROR 0x0f
+#define STMFTS_EV_CONTROLLER_READY 0x10
+#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
+#define STMFTS_EV_STATUS 0x16
+#define STMFTS_EV_DEBUG 0xdb
+
+/* multi touch related event masks */
+#define STMFTS_MASK_EVENT_ID 0x0f
+#define STMFTS_MASK_TOUCH_ID 0xf0
+#define STMFTS_MASK_LEFT_EVENT 0x0f
+#define STMFTS_MASK_X_MSB 0x0f
+#define STMFTS_MASK_Y_LSB 0xf0
+
+/* key related event masks */
+#define STMFTS_MASK_KEY_NO_TOUCH 0x00
+#define STMFTS_MASK_KEY_MENU 0x01
+#define STMFTS_MASK_KEY_BACK 0x02
+
+#define STMFTS_EVENT_SIZE 8
+#define STMFTS_STACK_DEPTH 32
+#define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
+#define STMFTS_MAX_FINGERS 10
+#define STMFTS_DEV_NAME "stmfts"
+
+enum stmfts_regulators {
+ STMFTS_REGULATOR_VDD,
+ STMFTS_REGULATOR_AVDD,
+};
+
+struct stmfts_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct led_classdev led_cdev;
+ struct mutex mutex;
+
+ struct touchscreen_properties prop;
+
+ struct regulator_bulk_data regulators[2];
+
+ /* ledvdd will be used also to check
+ * whether the LED is supported
+ */
+ struct regulator *ledvdd;
+
+ u16 chip_id;
+ u8 chip_ver;
+ u16 fw_ver;
+ u8 config_id;
+ u8 config_ver;
+
+ u8 data[STMFTS_DATA_MAX_SIZE];
+
+ struct completion signal;
+
+ bool use_key;
+ bool led_status;
+ bool hover_enabled;
+ bool running;
+};
+
+static int stmfts_read_i2c_block_data(struct stmfts_data *sdata)
+{
+ struct i2c_msg msgs[2];
+ u8 cmd = STMFTS_READ_ALL_EVENT;
+
+ msgs[0].addr = sdata->client->addr;
+ msgs[0].flags = 0;
+ msgs[0].len = 1;
+ msgs[0].buf = &cmd;
+
+ msgs[1].addr = sdata->client->addr;
+ msgs[1].flags = I2C_M_RD;
+ msgs[1].len = STMFTS_DATA_MAX_SIZE - STMFTS_EVENT_SIZE;
+ msgs[1].buf = sdata->data + STMFTS_EVENT_SIZE;
+
+ return i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
+}
+
+static void stmfts_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct stmfts_data *sdata = container_of(led_cdev,
+ struct stmfts_data, led_cdev);
+
+ if (value == sdata->led_status || !sdata->ledvdd)
+ return;
+
+ if (!value) {
+ regulator_disable(sdata->ledvdd);
+ } else {
+ int err = regulator_enable(sdata->ledvdd);
+
+ if (err)
+ dev_warn(&sdata->client->dev,
+ "failed to disable ledvdd regulator\n");
+ }
+
+ sdata->led_status = value;
+}
+
+static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
+{
+ struct stmfts_data *sdata = container_of(led_cdev,
+ struct stmfts_data, led_cdev);
+
+ return !!regulator_is_enabled(sdata->ledvdd);
+}
+
+static void stmfts_parse_event(struct stmfts_data *sdata)
+{
+ u8 id, t_id;
+ u16 x, y, z, maj, min, orientation, area;
+ u8 *event;
+ int i;
+
+ for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
+ event = &sdata->data[i*STMFTS_EVENT_SIZE];
+
+ id = event[0] & STMFTS_MASK_EVENT_ID;
+ t_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+
+ switch (id) {
+ case STMFTS_EV_NO_EVENT:
+ return;
+
+ case STMFTS_EV_MULTI_TOUCH_ENTER:
+ case STMFTS_EV_MULTI_TOUCH_LEAVE:
+ case STMFTS_EV_MULTI_TOUCH_MOTION:
+ if (id == STMFTS_EV_MULTI_TOUCH_ENTER)
+ input_mt_report_slot_state(sdata->input,
+ MT_TOOL_FINGER, true);
+ else if (id == STMFTS_EV_MULTI_TOUCH_LEAVE)
+ input_mt_report_slot_state(sdata->input,
+ MT_TOOL_FINGER, false);
+
+ x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
+ y = (event[2] >> 4) | (event[3] << 4);
+
+ maj = event[4];
+ min = event[5];
+ orientation = event[6];
+ area = event[7];
+
+ input_mt_slot(sdata->input, t_id);
+ input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
+ input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
+ input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
+ input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
+ input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
+ input_report_abs(sdata->input, ABS_MT_ORIENTATION,
+ orientation);
+ input_sync(sdata->input);
+
+ break;
+
+ case STMFTS_EV_HOVER_ENTER:
+ case STMFTS_EV_HOVER_LEAVE:
+ case STMFTS_EV_HOVER_MOTION:
+ x = (event[2] << 4) | (event[4] >> 4);
+ y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
+ z = event[5];
+ orientation = event[6] & STMFTS_MASK_Y_LSB;
+
+ input_report_abs(sdata->input, ABS_X, x);
+ input_report_abs(sdata->input, ABS_Y, y);
+ input_report_abs(sdata->input, ABS_DISTANCE, z);
+ input_sync(sdata->input);
+
+ break;
+
+ case STMFTS_EV_KEY_STATUS:
+ switch (event[2]) {
+ case 0:
+ input_report_key(sdata->input, KEY_BACK, 0);
+ input_report_key(sdata->input, KEY_MENU, 0);
+ break;
+
+ case STMFTS_MASK_KEY_BACK:
+ input_report_key(sdata->input, KEY_BACK, 1);
+ break;
+
+ case STMFTS_MASK_KEY_MENU:
+ input_report_key(sdata->input, KEY_MENU, 1);
+ break;
+
+ default:
+ dev_warn(&sdata->client->dev,
+ "unknown key event\n");
+ }
+
+ input_sync(sdata->input);
+ break;
+
+ case STMFTS_EV_ERROR:
+ dev_warn(&sdata->client->dev,
+ "error code: 0x%x%x%x%x%x%x",
+ event[6], event[5], event[4],
+ event[3], event[2], event[1]);
+ break;
+
+ default:
+ dev_err(&sdata->client->dev,
+ "unknown event 0x%x\n", event[0]);
+ }
+ }
+}
+
+static irqreturn_t stmfts_irq_handler(int irq, void *dev)
+{
+ struct stmfts_data *sdata = dev;
+ int ret;
+
+ mutex_lock(&sdata->mutex);
+ ret = i2c_smbus_read_i2c_block_data(sdata->client,
+ STMFTS_READ_ONE_EVENT,
+ STMFTS_EVENT_SIZE, sdata->data);
+
+ if (ret < 0 || ret != STMFTS_EVENT_SIZE)
+ goto exit;
+
+ switch (sdata->data[0]) {
+ case STMFTS_EV_CONTROLLER_READY:
+ case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
+ case STMFTS_EV_STATUS:
+ complete(&sdata->signal);
+ case STMFTS_EV_NO_EVENT:
+ case STMFTS_EV_DEBUG:
+ break;
+
+ default:
+ if (unlikely(!sdata->input))
+ goto exit;
+
+ ret = stmfts_read_i2c_block_data(sdata);
+ if (ret < 0)
+ goto exit;
+
+ stmfts_parse_event(sdata);
+ }
+
+exit:
+ mutex_unlock(&sdata->mutex);
+ return IRQ_HANDLED;
+}
+
+static int stmfts_write_and_wait(struct stmfts_data *sdata, const u8 cmd)
+{
+ int err;
+
+ err = i2c_smbus_write_byte(sdata->client, cmd);
+ if (err)
+ return err;
+
+ err = wait_for_completion_timeout(&sdata->signal,
+ msecs_to_jiffies(1000));
+
+ return !err ? -ETIMEDOUT : 0;
+}
+
+static int stmfts_input_open(struct input_dev *dev)
+{
+ int ret;
+ struct stmfts_data *sdata = input_get_drvdata(dev);
+
+ ret = pm_runtime_get_sync(&sdata->client->dev);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
+ if (ret)
+ return ret;
+
+ mutex_lock(&sdata->mutex);
+ sdata->running = true;
+
+ if (sdata->hover_enabled) {
+ ret = i2c_smbus_write_byte(sdata->client,
+ STMFTS_SS_HOVER_SENSE_ON);
+ if (ret)
+ dev_warn(&sdata->client->dev,
+ "failed to enable hover\n");
+ }
+ mutex_unlock(&sdata->mutex);
+
+ if (sdata->use_key) {
+ ret = i2c_smbus_write_byte(sdata->client,
+ STMFTS_MS_KEY_SENSE_ON);
+ if (ret)
+ /* I can still use only the touch screen */
+ dev_warn(&sdata->client->dev,
+ "failed to enable touchkey\n");
+ }
+
+ return 0;
+}
+
+static void stmfts_input_close(struct input_dev *dev)
+{
+ int ret;
+ struct stmfts_data *sdata = input_get_drvdata(dev);
+
+ ret = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
+ if (ret)
+ dev_warn(&sdata->client->dev,
+ "failed to disable touchscreen\n");
+
+ mutex_lock(&sdata->mutex);
+ sdata->running = false;
+
+ if (sdata->hover_enabled) {
+ ret = i2c_smbus_write_byte(sdata->client,
+ STMFTS_SS_HOVER_SENSE_OFF);
+ if (ret)
+ dev_warn(&sdata->client->dev,
+ "failed to disable hover\n");
+ }
+ mutex_unlock(&sdata->mutex);
+
+ if (sdata->use_key) {
+ i2c_smbus_write_byte(sdata->client, STMFTS_MS_KEY_SENSE_OFF);
+ if (ret)
+ dev_warn(&sdata->client->dev,
+ "failed to disable touchkey\n");
+ }
+
+ pm_runtime_put_sync(&sdata->client->dev);
+}
+
+static ssize_t stmfts_sysfs_chip_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "0x%x\n", sdata->chip_id);
+}
+
+static ssize_t stmfts_sysfs_chip_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", sdata->chip_ver);
+}
+
+static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", sdata->fw_ver);
+}
+
+static ssize_t stmfts_sysfs_config_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "0x%x\n", sdata->config_id);
+}
+
+static ssize_t stmfts_sysfs_config_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", sdata->config_ver);
+}
+
+static ssize_t stmfts_sysfs_read_status(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+ u8 status[4];
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(sdata->client,
+ STMFTS_READ_STATUS, 4, status);
+
+ return sprintf(buf, "0x%x\n", status[0]);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", sdata->hover_enabled);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ unsigned long value;
+ int err;
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ if (kstrtoul(buf, 0, &value))
+ return -EINVAL;
+
+ mutex_lock(&sdata->mutex);
+
+ if (value & sdata->hover_enabled)
+ goto out;
+
+ if (!sdata->running) {
+ sdata->hover_enabled = !!value;
+ goto out;
+ }
+
+ if (value) {
+ err = i2c_smbus_write_byte(sdata->client,
+ STMFTS_SS_HOVER_SENSE_ON);
+ sdata->hover_enabled = !err;
+ } else {
+ err = i2c_smbus_write_byte(sdata->client,
+ STMFTS_SS_HOVER_SENSE_OFF);
+ sdata->hover_enabled = !!err;
+ }
+
+ if (err)
+ dev_warn(&sdata->client->dev, "failed to %s hover\n",
+ value ? "enable" : "disable");
+out:
+ mutex_unlock(&sdata->mutex);
+
+ return len;
+}
+
+static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
+static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
+static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
+static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
+static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
+static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
+static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
+ stmfts_sysfs_hover_enable_write);
+
+static struct attribute *stmfts_sysfs_attrs[] = {
+ &dev_attr_chip_id.attr,
+ &dev_attr_chip_version.attr,
+ &dev_attr_fw_ver.attr,
+ &dev_attr_config_id.attr,
+ &dev_attr_config_version.attr,
+ &dev_attr_status.attr,
+ &dev_attr_hover_enable.attr,
+ NULL
+};
+
+static struct attribute_group stmfts_attribute_group = {
+ .attrs = stmfts_sysfs_attrs
+};
+
+static int stmfts_power_on(struct stmfts_data *sdata)
+{
+ int err;
+ u8 reg[8];
+
+ err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
+ sdata->regulators);
+ if (err)
+ return err;
+
+ /*
+ * the datasheet does not specify the power on time, but considering
+ * that the reset time is < 10ms, I sleep 20ms to be sure
+ */
+ msleep(20);
+
+ err = i2c_smbus_read_i2c_block_data(sdata->client,
+ STMFTS_READ_INFO, 8, reg);
+ if (err < 0)
+ return err;
+ if (err != 8)
+ return -EIO;
+
+ sdata->chip_id = (reg[6] << 8) | reg[7];
+ sdata->chip_ver = reg[0];
+ sdata->fw_ver = (reg[2] << 8) | reg[3];
+ sdata->config_id = reg[4];
+ sdata->config_ver = reg[5];
+
+ reinit_completion(&sdata->signal);
+
+ enable_irq(sdata->client->irq);
+ err = stmfts_write_and_wait(sdata, STMFTS_SYSTEM_RESET);
+ if (err)
+ return err;
+
+ err = stmfts_write_and_wait(sdata, STMFTS_SLEEP_OUT);
+ if (err)
+ return err;
+
+ /* optional tuning */
+ err = stmfts_write_and_wait(sdata, STMFTS_MS_CX_TUNING);
+ if (err)
+ dev_warn(&sdata->client->dev, "failed to perform mutual auto tune\n");
+
+ /* optional tuning */
+ err = stmfts_write_and_wait(sdata, STMFTS_SS_CX_TUNING);
+ if (err)
+ dev_warn(&sdata->client->dev, "failed to perform self auto tune\n");
+
+ err = stmfts_write_and_wait(sdata, STMFTS_FULL_FORCE_CALIBRATION);
+ if (err)
+ return err;
+
+ /* at this point no one is using the touchscreen
+ * and I don't really care about the return value
+ */
+ i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+
+ return 0;
+}
+
+static void stmfts_power_off(void *data)
+{
+ struct stmfts_data *sdata = data;
+
+ disable_irq(sdata->client->irq);
+ regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
+ sdata->regulators);
+}
+
+/* This function is void because I don't want to prevent using the touch key
+ * only because the LEDs don't get registered
+ */
+static int stmfts_enable_led(struct stmfts_data *sdata)
+{
+ int err;
+
+ /* get the regulator for powering the leds on */
+ sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
+ if (IS_ERR(sdata->ledvdd))
+ return PTR_ERR(sdata->ledvdd);
+
+ sdata->led_cdev.name = STMFTS_DEV_NAME;
+ sdata->led_cdev.max_brightness = LED_ON;
+ sdata->led_cdev.brightness = LED_OFF;
+ sdata->led_cdev.brightness_set = stmfts_brightness_set;
+ sdata->led_cdev.brightness_get = stmfts_brightness_get;
+
+ err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
+ if (err) {
+ devm_regulator_put(sdata->ledvdd);
+ return err;
+ }
+
+ return 0;
+}
+
+static int stmfts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err;
+ struct stmfts_data *sdata;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -ENODEV;
+
+ if (!client->dev.of_node)
+ return -ENOENT;
+
+ sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
+ if (!sdata)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, sdata);
+
+ mutex_init(&sdata->mutex);
+
+ sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
+ sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
+ err = devm_regulator_bulk_get(&client->dev,
+ ARRAY_SIZE(sdata->regulators), sdata->regulators);
+ if (err)
+ return err;
+
+ err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
+ if (err)
+ return err;
+
+ sdata->client = client;
+
+ init_completion(&sdata->signal);
+
+ /*
+ * Do not enable interrupts by default.
+ * One possible case when an IRQ can be already rased is e.g. if the
+ * regulator is set as always on and the stmfts device sends an IRQ as
+ * soon as it gets powered, de-synchronizing the power on sequence.
+ * During power on, the device will be reset and all the initialization
+ * IRQ will be resent.
+ */
+ irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
+ err = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, stmfts_irq_handler,
+ IRQF_ONESHOT | IRQF_TRIGGER_LOW,
+ "stmfts_irq", sdata);
+ if (err)
+ return err;
+
+ dev_info(&client->dev, "initializing ST-Microelectronics FTS...\n");
+ err = stmfts_power_on(sdata);
+ if (err)
+ return err;
+
+ sdata->use_key = of_property_read_bool(client->dev.of_node,
+ "touch-key-connected");
+
+ sdata->input = devm_input_allocate_device(&client->dev);
+ if (!sdata->input)
+ return -ENOMEM;
+
+ sdata->input->name = STMFTS_DEV_NAME;
+ sdata->input->id.bustype = BUS_I2C;
+ sdata->input->open = stmfts_input_open;
+ sdata->input->close = stmfts_input_close;
+
+ touchscreen_parse_properties(sdata->input, true, &sdata->prop);
+
+ input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0,
+ sdata->prop.max_x, 0, 0);
+ input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0,
+ sdata->prop.max_y, 0, 0);
+ input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+ input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
+ input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
+ input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+ input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
+
+ if (sdata->use_key) {
+ input_set_capability(sdata->input, EV_KEY, KEY_MENU);
+ input_set_capability(sdata->input, EV_KEY, KEY_BACK);
+ }
+
+ err = input_mt_init_slots(sdata->input,
+ STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
+ if (err)
+ return err;
+
+ input_set_drvdata(sdata->input, sdata);
+ err = input_register_device(sdata->input);
+ if (err)
+ return err;
+
+ if (sdata->use_key) {
+ err = stmfts_enable_led(sdata);
+ if (err) {
+ /* even if the LEDs have failed to be initialized and
+ * used in the driver, I can still use the device even
+ * without LEDs. The ledvdd regulator pointer will be
+ * used as a flag.
+ */
+ dev_warn(&client->dev,
+ "unable to use touchkey leds\n");
+ sdata->ledvdd = NULL;
+ }
+ }
+
+ err = sysfs_create_group(&sdata->client->dev.kobj,
+ &stmfts_attribute_group);
+ if (err)
+ return err;
+
+ pm_runtime_enable(&client->dev);
+
+ return 0;
+}
+
+static int stmfts_remove(struct i2c_client *client)
+{
+ pm_runtime_disable(&client->dev);
+ sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
+
+ return 0;
+}
+
+static int stmfts_runtime_suspend(struct device *dev)
+{
+ int ret;
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+ if (ret)
+ dev_warn(dev, "failed to suspend device\n");
+
+ return ret;
+}
+
+static int stmfts_runtime_resume(struct device *dev)
+{
+ int ret;
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
+ if (ret)
+ dev_err(dev, "failed to resume device\n");
+
+ return ret;
+}
+
+static int __maybe_unused stmfts_suspend(struct device *dev)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ stmfts_power_off(sdata);
+
+ return 0;
+}
+
+static int __maybe_unused stmfts_resume(struct device *dev)
+{
+ struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+ return stmfts_power_on(sdata);
+}
+
+static const struct dev_pm_ops stmfts_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
+ SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
+};
+
+static const struct of_device_id stmfts_of_match[] = {
+ { .compatible = "st,stmfts", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, stmfts_of_match);
+
+static const struct i2c_device_id stmfts_id[] = {
+ { "stmfts", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, stmfts_id);
+
+static struct i2c_driver stmfts_driver = {
+ .driver = {
+ .name = STMFTS_DEV_NAME,
+ .of_match_table = of_match_ptr(stmfts_of_match),
+ .pm = &stmfts_pm_ops,
+ },
+ .probe = stmfts_probe,
+ .remove = stmfts_remove,
+ .id_table = stmfts_id,
+};
+
+module_i2c_driver(stmfts_driver);
+
+MODULE_AUTHOR("Andi Shyti <andi.shyti@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
+MODULE_LICENSE("GPL v2");
--
2.11.0
--
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