4 files changed, 643 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index df1bb6be63f98a..48b6b60fd56da3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25071,6 +25071,12 @@ W:	http://thinkwiki.org/wiki/Ibm-acpi
 T:	git git://repo.or.cz/linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git
 F:	drivers/platform/x86/lenovo/thinkpad_acpi.c
 
+THINKPAD T14S EMBEDDED CONTROLLER DRIVER
+M:	Sebastian Reichel <sre@kernel.org>
+S:	Maintained
+F:	Documentation/devicetree/bindings/embedded-controller/lenovo,thinkpad-t14s-ec.yaml
+F:	drivers/platform/arm64/lenovo-thinkpad-t14s.c
+
 THINKPAD LMI DRIVER
 M:	Mark Pearson <mpearson-lenovo@squebb.ca>
 L:	platform-driver-x86@vger.kernel.org
diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig
index 06288aebc55994..10f905d7d6bfa5 100644
--- a/drivers/platform/arm64/Kconfig
+++ b/drivers/platform/arm64/Kconfig
@@ -70,4 +70,24 @@ config EC_LENOVO_YOGA_C630
 
 	  Say M or Y here to include this support.
 
+config EC_LENOVO_THINKPAD_T14S
+	tristate "Lenovo Thinkpad T14s Embedded Controller driver"
+	depends on ARCH_QCOM || COMPILE_TEST
+	depends on I2C
+	depends on INPUT
+	select INPUT_SPARSEKMAP
+	select LEDS_CLASS
+	select NEW_LEDS
+	select SND_CTL_LED if SND
+	help
+	  Driver for the Embedded Controller in the Qualcomm Snapdragon-based
+	  Lenovo Thinkpad T14s, which provides access to keyboard backlight
+	  and status LEDs.
+
+	  This driver provides support for the mentioned laptop where this
+	  information is not properly exposed via the standard Qualcomm
+	  devices.
+
+	  Say M or Y here to include this support.
+
 endif # ARM64_PLATFORM_DEVICES
diff --git a/drivers/platform/arm64/Makefile b/drivers/platform/arm64/Makefile
index 46a99eba3264cc..60c131cff6a15b 100644
--- a/drivers/platform/arm64/Makefile
+++ b/drivers/platform/arm64/Makefile
@@ -8,3 +8,4 @@
 obj-$(CONFIG_EC_ACER_ASPIRE1)	+= acer-aspire1-ec.o
 obj-$(CONFIG_EC_HUAWEI_GAOKUN)	+= huawei-gaokun-ec.o
 obj-$(CONFIG_EC_LENOVO_YOGA_C630) += lenovo-yoga-c630.o
+obj-$(CONFIG_EC_LENOVO_THINKPAD_T14S) += lenovo-thinkpad-t14s.o
diff --git a/drivers/platform/arm64/lenovo-thinkpad-t14s.c b/drivers/platform/arm64/lenovo-thinkpad-t14s.c
new file mode 100644
index 00000000000000..1d5d11adaf3206
--- /dev/null
+++ b/drivers/platform/arm64/lenovo-thinkpad-t14s.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025, Sebastian Reichel
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/interrupt.h>
+#include <linux/leds.h>
+#include <linux/lockdep.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define T14S_EC_CMD_ECRD	0x02
+#define T14S_EC_CMD_ECWR	0x03
+#define T14S_EC_CMD_EVT		0xf0
+
+#define T14S_EC_REG_LED		0x0c
+#define T14S_EC_REG_KBD_BL1	0x0d
+#define T14S_EC_REG_KBD_BL2	0xe1
+#define T14S_EC_KBD_BL1_MASK	GENMASK_U8(7, 6)
+#define T14S_EC_KBD_BL2_MASK	GENMASK_U8(3, 2)
+#define T14S_EC_REG_AUD		0x30
+#define T14S_EC_MIC_MUTE_LED	BIT(5)
+#define T14S_EC_SPK_MUTE_LED	BIT(6)
+
+#define T14S_EC_EVT_NONE			0x00
+#define T14S_EC_EVT_KEY_FN_4			0x13
+#define T14S_EC_EVT_KEY_FN_F7			0x16
+#define T14S_EC_EVT_KEY_FN_SPACE		0x1f
+#define T14S_EC_EVT_KEY_TP_DOUBLE_TAP		0x20
+#define T14S_EC_EVT_AC_CONNECTED		0x26
+#define T14S_EC_EVT_AC_DISCONNECTED		0x27
+#define T14S_EC_EVT_KEY_POWER			0x28
+#define T14S_EC_EVT_LID_OPEN			0x2a
+#define T14S_EC_EVT_LID_CLOSED			0x2b
+#define T14S_EC_EVT_THERMAL_TZ40		0x5c
+#define T14S_EC_EVT_THERMAL_TZ42		0x5d
+#define T14S_EC_EVT_THERMAL_TZ39		0x5e
+#define T14S_EC_EVT_KEY_FN_F12			0x62
+#define T14S_EC_EVT_KEY_FN_TAB			0x63
+#define T14S_EC_EVT_KEY_FN_F8			0x64
+#define T14S_EC_EVT_KEY_FN_F10			0x65
+#define T14S_EC_EVT_KEY_FN_F4			0x6a
+#define T14S_EC_EVT_KEY_FN_D			0x6b
+#define T14S_EC_EVT_KEY_FN_T			0x6c
+#define T14S_EC_EVT_KEY_FN_H			0x6d
+#define T14S_EC_EVT_KEY_FN_M			0x6e
+#define T14S_EC_EVT_KEY_FN_L			0x6f
+#define T14S_EC_EVT_KEY_FN_RIGHT_SHIFT		0x71
+#define T14S_EC_EVT_KEY_FN_ESC			0x74
+#define T14S_EC_EVT_KEY_FN_N			0x79
+#define T14S_EC_EVT_KEY_FN_F11			0x7a
+#define T14S_EC_EVT_KEY_FN_G			0x7e
+
+/* Hardware LED blink rate is 1 Hz (500ms off, 500ms on) */
+#define T14S_EC_BLINK_RATE_ON_OFF_MS		500
+
+/*
+ * Add a virtual offset on all key event codes for sparse keymap handling,
+ * since the sparse keymap infrastructure does not map some raw key event
+ * codes used by the EC. For example 0x16 (T14S_EC_EVT_KEY_FN_F7) is mapped
+ * to KEY_MUTE if no offset is applied.
+ */
+#define T14S_EC_KEY_EVT_OFFSET			0x1000
+#define T14S_EC_KEY_ENTRY(key, value) \
+	{ KE_KEY, T14S_EC_KEY_EVT_OFFSET + T14S_EC_EVT_KEY_##key, { value } }
+
+enum t14s_ec_led_status_t {
+	T14S_EC_LED_OFF =	0x00,
+	T14S_EC_LED_ON =	0x80,
+	T14S_EC_LED_BLINK =	0xc0,
+};
+
+struct t14s_ec_led_classdev {
+	struct led_classdev led_classdev;
+	int led;
+	enum t14s_ec_led_status_t cache;
+	struct t14s_ec *ec;
+};
+
+struct t14s_ec {
+	struct regmap *regmap;
+	struct device *dev;
+	struct t14s_ec_led_classdev led_pwr_btn;
+	struct t14s_ec_led_classdev led_chrg_orange;
+	struct t14s_ec_led_classdev led_chrg_white;
+	struct t14s_ec_led_classdev led_lid_logo_dot;
+	struct led_classdev kbd_backlight;
+	struct led_classdev led_mic_mute;
+	struct led_classdev led_spk_mute;
+	struct input_dev *inputdev;
+};
+
+static const struct regmap_config t14s_ec_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xff,
+};
+
+static int t14s_ec_write(void *context, unsigned int reg,
+				  unsigned int val)
+{
+	struct t14s_ec *ec = context;
+	struct i2c_client *client = to_i2c_client(ec->dev);
+	u8 buf[5] = {T14S_EC_CMD_ECWR, reg, 0x00, 0x01, val};
+	int ret;
+
+	ret = i2c_master_send(client, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int t14s_ec_read(void *context, unsigned int reg,
+				 unsigned int *val)
+{
+	struct t14s_ec *ec = context;
+	struct i2c_client *client = to_i2c_client(ec->dev);
+	u8 buf[4] = {T14S_EC_CMD_ECRD, reg, 0x00, 0x01};
+	struct i2c_msg request, response;
+	u8 result;
+	int ret;
+
+	request.addr = client->addr;
+	request.flags = I2C_M_STOP;
+	request.len = sizeof(buf);
+	request.buf = buf;
+	response.addr = client->addr;
+	response.flags = I2C_M_RD;
+	response.len = 1;
+	response.buf = &result;
+
+	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
+
+	ret = __i2c_transfer(client->adapter, &request, 1);
+	if (ret < 0)
+		goto out;
+
+	ret = __i2c_transfer(client->adapter, &response, 1);
+	if (ret < 0)
+		goto out;
+
+	*val = result;
+	ret = 0;
+
+out:
+	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
+	return ret;
+}
+
+static const struct regmap_bus t14s_ec_regmap_bus = {
+	.reg_write = t14s_ec_write,
+	.reg_read = t14s_ec_read,
+};
+
+static int t14s_ec_read_evt(struct t14s_ec *ec, u8 *val)
+{
+	struct i2c_client *client = to_i2c_client(ec->dev);
+	u8 buf[4] = {T14S_EC_CMD_EVT, 0x00, 0x00, 0x01};
+	struct i2c_msg request, response;
+	int ret;
+
+	request.addr = client->addr;
+	request.flags = I2C_M_STOP;
+	request.len = sizeof(buf);
+	request.buf = buf;
+	response.addr = client->addr;
+	response.flags = I2C_M_RD;
+	response.len = 1;
+	response.buf = val;
+
+	i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
+
+	ret = __i2c_transfer(client->adapter, &request, 1);
+	if (ret < 0)
+		goto out;
+
+	ret = __i2c_transfer(client->adapter, &response, 1);
+	if (ret < 0)
+		goto out;
+
+	ret = 0;
+
+out:
+	i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
+	return ret;
+}
+
+static int t14s_led_set_status(struct t14s_ec *ec,
+			       struct t14s_ec_led_classdev *led,
+			       const enum t14s_ec_led_status_t ledstatus)
+{
+	int ret;
+
+	ret = regmap_write(ec->regmap, T14S_EC_REG_LED,
+			   led->led | ledstatus);
+	if (ret < 0)
+		return ret;
+
+	led->cache = ledstatus;
+	return 0;
+}
+
+static int t14s_led_brightness_set(struct led_classdev *led_cdev,
+				   enum led_brightness brightness)
+{
+	struct t14s_ec_led_classdev *led = container_of(led_cdev,
+				struct t14s_ec_led_classdev, led_classdev);
+	enum t14s_ec_led_status_t new_state;
+
+	if (brightness == LED_OFF)
+		new_state = T14S_EC_LED_OFF;
+	else if (led->cache == T14S_EC_LED_BLINK)
+		new_state = T14S_EC_LED_BLINK;
+	else
+		new_state = T14S_EC_LED_ON;
+
+	return t14s_led_set_status(led->ec, led, new_state);
+}
+
+static int t14s_led_blink_set(struct led_classdev *led_cdev,
+			      unsigned long *delay_on,
+			      unsigned long *delay_off)
+{
+	struct t14s_ec_led_classdev *led = container_of(led_cdev,
+				struct t14s_ec_led_classdev, led_classdev);
+
+	if (*delay_on == 0 && *delay_off == 0) {
+		/* Userspace does not provide a blink rate; we can choose it */
+		*delay_on = T14S_EC_BLINK_RATE_ON_OFF_MS;
+		*delay_off = T14S_EC_BLINK_RATE_ON_OFF_MS;
+	} else if ((*delay_on != T14S_EC_BLINK_RATE_ON_OFF_MS) ||
+		   (*delay_off != T14S_EC_BLINK_RATE_ON_OFF_MS))
+		return -EINVAL;
+
+	return t14s_led_set_status(led->ec, led, T14S_EC_LED_BLINK);
+}
+
+static int t14s_init_led(struct t14s_ec *ec, struct t14s_ec_led_classdev *led,
+			 u8 id, const char *name)
+{
+	led->led_classdev.name = name;
+	led->led_classdev.flags = LED_RETAIN_AT_SHUTDOWN;
+	led->led_classdev.max_brightness = 1;
+	led->led_classdev.brightness_set_blocking = t14s_led_brightness_set;
+	led->led_classdev.blink_set = t14s_led_blink_set;
+	led->ec = ec;
+	led->led = id;
+
+	return devm_led_classdev_register(ec->dev, &led->led_classdev);
+}
+
+static int t14s_leds_probe(struct t14s_ec *ec)
+{
+	int ret;
+
+	ret = t14s_init_led(ec, &ec->led_pwr_btn, 0, "platform::power");
+	if (ret)
+		return ret;
+
+	ret = t14s_init_led(ec, &ec->led_chrg_orange, 1,
+			    "platform:amber:battery-charging");
+	if (ret)
+		return ret;
+
+	ret = t14s_init_led(ec, &ec->led_chrg_white, 2,
+			    "platform:white:battery-full");
+	if (ret)
+		return ret;
+
+	ret = t14s_init_led(ec, &ec->led_lid_logo_dot, 10,
+			    "platform::lid_logo_dot");
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int t14s_kbd_bl_set(struct led_classdev *led_cdev,
+			   enum led_brightness brightness)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  kbd_backlight);
+	int ret;
+	u8 val;
+
+	val = FIELD_PREP(T14S_EC_KBD_BL1_MASK, brightness);
+	ret = regmap_update_bits(ec->regmap, T14S_EC_REG_KBD_BL1,
+				 T14S_EC_KBD_BL1_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	val = FIELD_PREP(T14S_EC_KBD_BL2_MASK, brightness);
+	ret = regmap_update_bits(ec->regmap, T14S_EC_REG_KBD_BL2,
+				 T14S_EC_KBD_BL2_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static enum led_brightness t14s_kbd_bl_get(struct led_classdev *led_cdev)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  kbd_backlight);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(ec->regmap, T14S_EC_REG_KBD_BL1, &val);
+	if (ret < 0)
+		return ret;
+
+	return FIELD_GET(T14S_EC_KBD_BL1_MASK, val);
+}
+
+static void t14s_kbd_bl_update(struct t14s_ec *ec)
+{
+	enum led_brightness brightness = t14s_kbd_bl_get(&ec->kbd_backlight);
+
+	led_classdev_notify_brightness_hw_changed(&ec->kbd_backlight, brightness);
+}
+
+static int t14s_kbd_backlight_probe(struct t14s_ec *ec)
+{
+	ec->kbd_backlight.name = "platform::kbd_backlight";
+	ec->kbd_backlight.flags = LED_BRIGHT_HW_CHANGED;
+	ec->kbd_backlight.max_brightness = 2;
+	ec->kbd_backlight.brightness_set_blocking = t14s_kbd_bl_set;
+	ec->kbd_backlight.brightness_get = t14s_kbd_bl_get;
+
+	return devm_led_classdev_register(ec->dev, &ec->kbd_backlight);
+}
+
+static enum led_brightness t14s_audio_led_get(struct t14s_ec *ec, u8 led_bit)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(ec->regmap, T14S_EC_REG_AUD, &val);
+	if (ret < 0)
+		return ret;
+
+	return !!(val & led_bit) ? LED_ON : LED_OFF;
+}
+
+static enum led_brightness t14s_audio_led_set(struct t14s_ec *ec,
+						       u8 led_mask,
+						       enum led_brightness brightness)
+{
+	return regmap_assign_bits(ec->regmap, T14S_EC_REG_AUD, led_mask, brightness > 0);
+}
+
+static enum led_brightness t14s_mic_mute_led_get(struct led_classdev *led_cdev)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  led_mic_mute);
+
+	return t14s_audio_led_get(ec, T14S_EC_MIC_MUTE_LED);
+}
+
+static int t14s_mic_mute_led_set(struct led_classdev *led_cdev,
+					  enum led_brightness brightness)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  led_mic_mute);
+
+	return t14s_audio_led_set(ec, T14S_EC_MIC_MUTE_LED, brightness);
+}
+
+static enum led_brightness t14s_spk_mute_led_get(struct led_classdev *led_cdev)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  led_spk_mute);
+
+	return t14s_audio_led_get(ec, T14S_EC_SPK_MUTE_LED);
+}
+
+static int t14s_spk_mute_led_set(struct led_classdev *led_cdev,
+					  enum led_brightness brightness)
+{
+	struct t14s_ec *ec = container_of(led_cdev, struct t14s_ec,
+					  led_spk_mute);
+
+	return t14s_audio_led_set(ec, T14S_EC_SPK_MUTE_LED, brightness);
+}
+
+static int t14s_kbd_audio_led_probe(struct t14s_ec *ec)
+{
+	int ret;
+
+	ec->led_mic_mute.name = "platform::micmute";
+	ec->led_mic_mute.max_brightness = 1;
+	ec->led_mic_mute.default_trigger = "audio-micmute";
+	ec->led_mic_mute.brightness_set_blocking = t14s_mic_mute_led_set;
+	ec->led_mic_mute.brightness_get = t14s_mic_mute_led_get;
+
+	ec->led_spk_mute.name = "platform::mute";
+	ec->led_spk_mute.max_brightness = 1;
+	ec->led_spk_mute.default_trigger = "audio-mute";
+	ec->led_spk_mute.brightness_set_blocking = t14s_spk_mute_led_set;
+	ec->led_spk_mute.brightness_get = t14s_spk_mute_led_get;
+
+	ret = devm_led_classdev_register(ec->dev, &ec->led_mic_mute);
+	if (ret)
+		return ret;
+
+	return devm_led_classdev_register(ec->dev, &ec->led_spk_mute);
+}
+
+static const struct key_entry t14s_keymap[] = {
+	T14S_EC_KEY_ENTRY(FN_4, KEY_SLEEP),
+	T14S_EC_KEY_ENTRY(FN_N, KEY_VENDOR),
+	T14S_EC_KEY_ENTRY(FN_F4, KEY_MICMUTE),
+	T14S_EC_KEY_ENTRY(FN_F7, KEY_SWITCHVIDEOMODE),
+	T14S_EC_KEY_ENTRY(FN_F8, KEY_PERFORMANCE),
+	T14S_EC_KEY_ENTRY(FN_F10, KEY_SELECTIVE_SCREENSHOT),
+	T14S_EC_KEY_ENTRY(FN_F11, KEY_LINK_PHONE),
+	T14S_EC_KEY_ENTRY(FN_F12, KEY_BOOKMARKS),
+	T14S_EC_KEY_ENTRY(FN_SPACE, KEY_KBDILLUMTOGGLE),
+	T14S_EC_KEY_ENTRY(FN_ESC, KEY_FN_ESC),
+	T14S_EC_KEY_ENTRY(FN_TAB, KEY_ZOOM),
+	T14S_EC_KEY_ENTRY(FN_RIGHT_SHIFT, KEY_FN_RIGHT_SHIFT),
+	T14S_EC_KEY_ENTRY(TP_DOUBLE_TAP, KEY_PROG4),
+	{ KE_END }
+};
+
+static int t14s_input_probe(struct t14s_ec *ec)
+{
+	int ret;
+
+	ec->inputdev = devm_input_allocate_device(ec->dev);
+	if (!ec->inputdev)
+		return -ENOMEM;
+
+	ec->inputdev->name = "ThinkPad Extra Buttons";
+	ec->inputdev->phys = "thinkpad/input0";
+	ec->inputdev->id.bustype = BUS_HOST;
+	ec->inputdev->dev.parent = ec->dev;
+
+	ret = sparse_keymap_setup(ec->inputdev, t14s_keymap, NULL);
+	if (ret)
+		return ret;
+
+	return input_register_device(ec->inputdev);
+}
+
+static irqreturn_t t14s_ec_irq_handler(int irq, void *data)
+{
+	struct t14s_ec *ec = data;
+	int ret;
+	u8 val;
+
+	ret = t14s_ec_read_evt(ec, &val);
+	if (ret < 0) {
+		dev_err(ec->dev, "Failed to read event\n");
+		return IRQ_HANDLED;
+	}
+
+	switch (val) {
+	case T14S_EC_EVT_NONE:
+		break;
+	case T14S_EC_EVT_KEY_FN_SPACE:
+		t14s_kbd_bl_update(ec);
+		fallthrough;
+	case T14S_EC_EVT_KEY_FN_F4:
+	case T14S_EC_EVT_KEY_FN_F7:
+	case T14S_EC_EVT_KEY_FN_4:
+	case T14S_EC_EVT_KEY_FN_F8:
+	case T14S_EC_EVT_KEY_FN_F12:
+	case T14S_EC_EVT_KEY_FN_TAB:
+	case T14S_EC_EVT_KEY_FN_F10:
+	case T14S_EC_EVT_KEY_FN_N:
+	case T14S_EC_EVT_KEY_FN_F11:
+	case T14S_EC_EVT_KEY_FN_ESC:
+	case T14S_EC_EVT_KEY_FN_RIGHT_SHIFT:
+	case T14S_EC_EVT_KEY_TP_DOUBLE_TAP:
+		sparse_keymap_report_event(ec->inputdev,
+				T14S_EC_KEY_EVT_OFFSET + val, 1, true);
+		break;
+	case T14S_EC_EVT_AC_CONNECTED:
+		dev_dbg(ec->dev, "AC connected\n");
+		break;
+	case T14S_EC_EVT_AC_DISCONNECTED:
+		dev_dbg(ec->dev, "AC disconnected\n");
+		break;
+	case T14S_EC_EVT_KEY_POWER:
+		dev_dbg(ec->dev, "power button\n");
+		break;
+	case T14S_EC_EVT_LID_OPEN:
+		dev_dbg(ec->dev, "LID open\n");
+		break;
+	case T14S_EC_EVT_LID_CLOSED:
+		dev_dbg(ec->dev, "LID closed\n");
+		break;
+	case T14S_EC_EVT_THERMAL_TZ40:
+		dev_dbg(ec->dev, "Thermal Zone 40 Status Change Event (CPU/GPU)\n");
+		break;
+	case T14S_EC_EVT_THERMAL_TZ42:
+		dev_dbg(ec->dev, "Thermal Zone 42 Status Change Event (Battery)\n");
+		break;
+	case T14S_EC_EVT_THERMAL_TZ39:
+		dev_dbg(ec->dev, "Thermal Zone 39 Status Change Event (CPU/GPU)\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_G:
+		dev_dbg(ec->dev, "FN + G - toggle double-tapping\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_L:
+		dev_dbg(ec->dev, "FN + L - low performance mode\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_M:
+		dev_dbg(ec->dev, "FN + M - medium performance mode\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_H:
+		dev_dbg(ec->dev, "FN + H - high performance mode\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_T:
+		dev_dbg(ec->dev, "FN + T - toggle intelligent cooling mode\n");
+		break;
+	case T14S_EC_EVT_KEY_FN_D:
+		dev_dbg(ec->dev, "FN + D - toggle privacy guard mode\n");
+		break;
+	default:
+		dev_info(ec->dev, "Unknown EC event: 0x%02x\n", val);
+		break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int t14s_ec_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct t14s_ec *ec;
+	int ret;
+
+	ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
+	if (!ec)
+		return -ENOMEM;
+
+	ec->dev = dev;
+
+	ec->regmap = devm_regmap_init(dev, &t14s_ec_regmap_bus,
+				      ec, &t14s_ec_regmap_config);
+	if (IS_ERR(ec->regmap))
+		return dev_err_probe(dev, PTR_ERR(ec->regmap),
+				     "Failed to init regmap\n");
+
+	ret = devm_request_threaded_irq(dev, client->irq, NULL,
+					t14s_ec_irq_handler,
+					IRQF_ONESHOT, dev_name(dev), ec);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to get IRQ\n");
+
+	ret = t14s_leds_probe(ec);
+	if (ret < 0)
+		return ret;
+
+	ret = t14s_kbd_backlight_probe(ec);
+	if (ret < 0)
+		return ret;
+
+	ret = t14s_kbd_audio_led_probe(ec);
+	if (ret < 0)
+		return ret;
+
+	ret = t14s_input_probe(ec);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Disable wakeup support by default, because the driver currently does
+	 * not support masking any events and the laptop should not wake up when
+	 * the LID is closed.
+	 */
+	device_wakeup_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id t14s_ec_of_match[] = {
+	{ .compatible = "lenovo,thinkpad-t14s-ec" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, t14s_ec_of_match);
+
+static const struct i2c_device_id t14s_ec_i2c_id_table[] = {
+	{ "thinkpad-t14s-ec", },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, t14s_ec_i2c_id_table);
+
+static struct i2c_driver t14s_ec_i2c_driver = {
+	.driver = {
+		.name = "thinkpad-t14s-ec",
+		.of_match_table = t14s_ec_of_match,
+	},
+	.probe = t14s_ec_probe,
+	.id_table = t14s_ec_i2c_id_table,
+};
+module_i2c_driver(t14s_ec_i2c_driver);
+
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
+MODULE_DESCRIPTION("Lenovo Thinkpad T14s Embedded Controller");
+MODULE_LICENSE("GPL");