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[PATCH v2 0/3] STM FingerTip S touchscreen support for TM2 board

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  [PATCH v2 0/3] STM FingerTip S touchscreen support for TM2 board Andi Shyti <andi.shyti@samsung.com> - 2017-02-10 03:20 +0100
    [PATCH v2 3/3] arm64: dts: exynos: Add stmfts touchscreen node for TM2  and TM2E Andi Shyti <andi.shyti@samsung.com> - 2017-02-10 03:20 +0100
      Re: [PATCH v2 3/3] arm64: dts: exynos: Add stmfts touchscreen node  for TM2 and TM2E Krzysztof Kozlowski <krzk@kernel.org> - 2017-02-10 14:50 +0100
    [PATCH v2 2/3] Input: add support for the STMicroelectronics FingerTip  touchscreen Andi Shyti <andi.shyti@samsung.com> - 2017-02-10 03:20 +0100

#1578116 — [PATCH v2 0/3] STM FingerTip S touchscreen support for TM2 board

Hi,

this patchset provides support for the ST-Microelectronics
FingerTip S device driver and enables it in the tm2 and tm2e
devices.

It's tested on top of next-20170210 kernel and applies on
Krzysztof's for-next branch.

Thanks,
Andi

Changelog V1-V2
===============
V1: https://marc.info/?l=linux-kernel&m=148466204431327&w=2

 - fixed Javier's, Krzysztof's and Dmitry's reviews
 - added Javier's review tag on patch 1 and 3
 - the main difference of the driver from v2 is that the driver
   generates only one input interface instead of two (one for the
   touchscreen and one for the touchkeys). The job of filtering
   the events is demanded to userspace applications that are
   accessing the device. This is done by making an ioctl call:

	ioctl(fd, EVIOCSMASK, &mask);

   where 'mask' is an 'input_mask' structure that contains the type
   variable of the EV_* that needs to be filtered out.

Andi Shyti (3):
  Input: add STMicroelectronics FingerTip touchscreen driver
  Input: add support for the STMicroelectronics FingerTip touchscreen
  arm64: dts: exynos: Add stmfts touchscreen node for TM2 and TM2E

 .../bindings/input/touchscreen/st,stmfts.txt       |  43 ++
 .../boot/dts/exynos/exynos5433-tm2-common.dtsi     |  15 +-
 arch/arm64/boot/dts/exynos/exynos5433-tm2.dts      |   5 +
 arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts     |   7 +
 drivers/input/touchscreen/Kconfig                  |  12 +
 drivers/input/touchscreen/Makefile                 |   1 +
 drivers/input/touchscreen/stmfts.c                 | 794 +++++++++++++++++++++
 7 files changed, 876 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/st,stmfts.txt
 create mode 100644 drivers/input/touchscreen/stmfts.c

-- 
2.11.0

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#1578118 — [PATCH v2 3/3] arm64: dts: exynos: Add stmfts touchscreen node for TM2 and TM2E

TM2 and TM2E devices are provided with a ST-Microelectronics
Finger Tip S device with small differences:

 - screen size
 - TM2E uses the stmfts also as a touchkey for "back" and "menu"

In this commit the initial value of the interrupt line is set to
EXYNOS_PIN_PULL_UP as the interrupt is triggered when the line
goes down.

Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
---
 arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 15 ++++++++++++++-
 arch/arm64/boot/dts/exynos/exynos5433-tm2.dts         |  5 +++++
 arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts        |  7 +++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
index 098ad557fee3..b1f7083dbe72 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
@@ -749,6 +749,19 @@
 	};
 };
 
+&hsi2c_5 {
+	status = "okay";
+
+	stmfts: touchscreen@49 {
+		compatible = "st,stmfts";
+		reg = <0x49>;
+		interrupt-parent = <&gpa1>;
+		interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
+		avdd-supply = <&ldo30_reg>;
+		vdd-supply = <&ldo31_reg>;
+	};
+};
+
 &hsi2c_7 {
 	status = "okay";
 
@@ -894,7 +907,7 @@
 		PIN(INPUT, gpa0-7, NONE, FAST_SR1);
 
 		PIN(INPUT, gpa1-0, UP, FAST_SR1);
-		PIN(INPUT, gpa1-1, NONE, FAST_SR1);
+		PIN(INPUT, gpa1-1, UP, FAST_SR1);
 		PIN(INPUT, gpa1-2, NONE, FAST_SR1);
 		PIN(INPUT, gpa1-3, DOWN, FAST_SR1);
 		PIN(INPUT, gpa1-4, DOWN, FAST_SR1);
diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
index dea0a6f5bc18..75274b3afbd3 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
@@ -76,3 +76,8 @@
 	regulator-min-microvolt = <3000000>;
 	regulator-max-microvolt = <3000000>;
 };
+
+&stmfts {
+	touchscreen-size-x = <1439>;
+	touchscreen-size-y = <2559>;
+};
diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
index 7891a31adc17..694717ade927 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
@@ -63,3 +63,10 @@
 	regulator-min-microvolt = <3300000>;
 	regulator-max-microvolt = <3300000>;
 };
+
+&stmfts {
+	touchscreen-size-x = <1599>;
+	touchscreen-size-y = <2559>;
+	touch-key-connected;
+	ledvdd-supply = <&ldo33_reg>;
+};
-- 
2.11.0

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#1578462 — Re: [PATCH v2 3/3] arm64: dts: exynos: Add stmfts touchscreen node for TM2 and TM2E

On Fri, Feb 10, 2017 at 11:17:21AM +0900, Andi Shyti wrote:
> TM2 and TM2E devices are provided with a ST-Microelectronics
> Finger Tip S device with small differences:
> 
>  - screen size
>  - TM2E uses the stmfts also as a touchkey for "back" and "menu"
> 
> In this commit the initial value of the interrupt line is set to
> EXYNOS_PIN_PULL_UP as the interrupt is triggered when the line
> goes down.
> 
> Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
> ---
>  arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 15 ++++++++++++++-
>  arch/arm64/boot/dts/exynos/exynos5433-tm2.dts         |  5 +++++
>  arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts        |  7 +++++++
>  3 files changed, 26 insertions(+), 1 deletion(-)
>

Looks fine. I'll apply after v4.11-rc1 merge window.

Best regards,
Krzysztof

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#1578119 — [PATCH v2 2/3] Input: add support for the STMicroelectronics FingerTip touchscreen

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@samsung.com>
---
 drivers/input/touchscreen/Kconfig  |  12 +
 drivers/input/touchscreen/Makefile |   1 +
 drivers/input/touchscreen/stmfts.c | 794 +++++++++++++++++++++++++++++++++++++
 3 files changed, 807 insertions(+)
 create mode 100644 drivers/input/touchscreen/stmfts.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 8650c94e29d0..18c2f919eb79 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1092,6 +1092,18 @@ 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 e41e3c7aa427..be7673f9c71a 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -66,6 +66,7 @@ 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..e1415e290677
--- /dev/null
+++ b/drivers/input/touchscreen/stmfts.c
@@ -0,0 +1,794 @@
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ * Author: Andi Shyti <andi.shyti@samsung.com>
+ *
+ * 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.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.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_SLEEP_IN				0x91
+#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
+
+/* 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_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;
+
+	bool use_key;
+	bool led_status;
+
+	u16 chip_id;
+	u8 chip_ver;
+	u16 fw_ver;
+	u8 config_id;
+	u8 config_ver;
+	u8 in_touch;
+
+	struct completion signal;
+
+	bool hover_enabled;
+	bool running;
+};
+
+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)
+		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 event[])
+{
+	int ret;
+	u8 id, t_id = 0;
+	u16 x, y, z, maj, min, orientation, area;
+
+	id = event[0];
+
+	do {
+		mutex_lock(&sdata->mutex);
+		if (sdata->in_touch) {
+			id = event[0] & STMFTS_MASK_EVENT_ID;
+			t_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+		} else {
+			id = event[0];
+			t_id = 0;
+		}
+
+		switch (id) {
+		case STMFTS_EV_NO_EVENT:
+			break;
+
+		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) {
+				if (!(sdata->in_touch++))
+					input_mt_report_slot_state(
+							sdata->input,
+							MT_TOOL_FINGER, true);
+			} else if (id == STMFTS_EV_MULTI_TOUCH_LEAVE) {
+				if (!(--sdata->in_touch))
+					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_STATUS:
+			complete(&sdata->signal);
+			break;
+
+		case STMFTS_EV_ERROR:
+			dev_err(&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]);
+		}
+		mutex_unlock(&sdata->mutex);
+
+		ret = i2c_smbus_read_i2c_block_data(sdata->client,
+						STMFTS_READ_ONE_EVENT,
+						STMFTS_EVENT_SIZE, event);
+		if (ret) {
+			i2c_smbus_write_byte(sdata->client,
+						STMFTS_CLEAR_EVENT_STACK);
+			break;
+		}
+
+	} while (event[0]);
+}
+
+static irqreturn_t stmfts_irq_handler(int irq, void *dev)
+{
+	struct stmfts_data *sdata = dev;
+	int ret;
+	u8 event[STMFTS_EVENT_SIZE];
+
+	ret = i2c_smbus_read_i2c_block_data(sdata->client,
+					STMFTS_READ_ONE_EVENT,
+					STMFTS_EVENT_SIZE, event);
+
+	switch (event[0]) {
+	case STMFTS_EV_CONTROLLER_READY:
+	case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
+		complete(&sdata->signal);
+		break;
+	default:
+		stmfts_parse_event(sdata, event);
+	}
+
+	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);
+
+	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;
+
+	/*
+	 * Disable irq they, they are not needed at this stage.
+	 * 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.
+	 */
+	disable_irq(sdata->client->irq);
+
+	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)
+{
+	struct stmfts_data *sdata = i2c_get_clientdata(client);
+
+	pm_runtime_disable(&client->dev);
+	sysfs_remove_group(&sdata->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(&sdata->client->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(&sdata->client->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);
+}
+
+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@samsung.com>");
+MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
+MODULE_LICENSE("GPL v2");
-- 
2.11.0

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