There are three variants of which Huawei released the first two
simultaneously.
Huawei Matebook E Go LTE(sc8180x), codename seems to be gaokun2.
Huawei Matebook E Go(sc8280xp@3.0GHz), codename must be gaokun3. (see [1])
Huawei Matebook E Go 2023(sc8280xp@2.69GHz), codename should be also gaokun3.
Adding support for the latter two variants for now, this driver should
also work for the sc8180x variant according to acpi table files, but I
don't have the device to test yet.
Different from other Qualcomm Snapdragon sc8280xp based machines, the
Huawei Matebook E Go uses an embedded controller while others use
a system called PMIC GLink. This embedded controller can be used to
perform a set of various functions, including, but not limited to:
- Battery and charger monitoring;
- Charge control and smart charge;
- Fn_lock settings;
- Tablet lid status;
- Temperature sensors;
- USB Type-C notifications (ports orientation, DP alt mode HPD);
- USB Type-C PD (according to observation, up to 48w).
Add a driver for the EC which creates devices for UCSI and power supply
devices.
This driver is inspired by the following drivers:
drivers/platform/arm64/acer-aspire1-ec.c
drivers/platform/arm64/lenovo-yoga-c630.c
drivers/platform/x86/huawei-wmi.c
[1] https://bugzilla.kernel.org/show_bug.cgi?id=219645
Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
---
MAINTAINERS | 7 +
drivers/platform/arm64/Kconfig | 21 +
drivers/platform/arm64/Makefile | 1 +
drivers/platform/arm64/huawei-gaokun-ec.c | 822 ++++++++++++++++++
.../linux/platform_data/huawei-gaokun-ec.h | 79 ++
5 files changed, 930 insertions(+)
create mode 100644 drivers/platform/arm64/huawei-gaokun-ec.c
create mode 100644 include/linux/platform_data/huawei-gaokun-ec.h
diff --git a/MAINTAINERS b/MAINTAINERS
index eb75c95f6..c1483810d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10692,6 +10692,13 @@ S: Maintained
F: Documentation/networking/device_drivers/ethernet/huawei/hinic.rst
F: drivers/net/ethernet/huawei/hinic/
+HUAWEI MATEBOOK E GO EMBEDDED CONTROLLER DRIVER
+M: Pengyu Luo <mitltlatltl@xxxxxxxxx>
+S: Maintained
+F: Documentation/devicetree/bindings/platform/huawei,gaokun-ec.yaml
+F: drivers/platform/arm64/huawei-gaokun-ec.c
+F: include/linux/platform_data/huawei-gaokun-ec.h
+
HUGETLB SUBSYSTEM
M: Muchun Song <muchun.song@xxxxxxxxx>
L: linux-mm@xxxxxxxxx
diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig
index f88395ea3..6ceee3c16 100644
--- a/drivers/platform/arm64/Kconfig
+++ b/drivers/platform/arm64/Kconfig
@@ -33,6 +33,27 @@ config EC_ACER_ASPIRE1
laptop where this information is not properly exposed via the
standard ACPI devices.
+config EC_HUAWEI_GAOKUN
+ tristate "Huawei Matebook E Go Embedded Controller driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ depends on I2C
+ depends on INPUT
+ select AUXILIARY_BUS
+
+ help
+ Say Y here to enable the EC driver for the Huawei Matebook E Go
+ which is a sc8280xp-based 2-in-1 tablet. The driver handles battery
+ (information, charge control) and USB Type-C DP HPD events as well
+ as some misc functions like the lid sensor and temperature sensors,
+ etc.
+
+ This driver provides battery and AC status support for the mentioned
+ laptop where this information is not properly exposed via the
+ standard ACPI devices.
+
+ Say M or Y here to include this support.
+
+
config EC_LENOVO_YOGA_C630
tristate "Lenovo Yoga C630 Embedded Controller driver"
depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/platform/arm64/Makefile b/drivers/platform/arm64/Makefile
index b2ae9114f..46a99eba3 100644
--- a/drivers/platform/arm64/Makefile
+++ b/drivers/platform/arm64/Makefile
@@ -6,4 +6,5 @@
#
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
diff --git a/drivers/platform/arm64/huawei-gaokun-ec.c b/drivers/platform/arm64/huawei-gaokun-ec.c
new file mode 100644
index 000000000..ff42efad9
--- /dev/null
+++ b/drivers/platform/arm64/huawei-gaokun-ec.c
@@ -0,0 +1,822 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * huawei-gaokun-ec - An EC driver for HUAWEI Matebook E Go
+ *
+ * Copyright (C) 2024-2025 Pengyu Luo <mitltlatltl@xxxxxxxxx>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/cleanup.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/notifier.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_data/huawei-gaokun-ec.h>
+
+#define EC_EVENT 0x06
+
+/* Also can be found in ACPI specification 12.3 */
+#define EC_READ 0x80
+#define EC_WRITE 0x81
+#define EC_BURST 0x82
+#define EC_QUERY 0x84
+
+#define EC_FN_LOCK_ON 0x5A
+#define EC_FN_LOCK_OFF 0x55
+#define EC_FN_LOCK_READ 0x6B
+#define EC_FN_LOCK_WRITE 0x6C
+
+#define EC_EVENT_LID 0x81
+
+#define EC_LID_STATE 0x80
+#define EC_LID_OPEN BIT(1)
+
+#define EC_TEMP_REG 0x61
+
+#define EC_STANDBY_REG 0xB2
+#define EC_STANDBY_ENTER 0xDB
+#define EC_STANDBY_EXIT 0xEB
+
+enum gaokun_ec_smart_charge_cmd {
+ SMART_CHARGE_DATA_WRITE = 0xE3,
+ SMART_CHARGE_DATA_READ,
+ SMART_CHARGE_ENABLE_WRITE,
+ SMART_CHARGE_ENABLE_READ,
+};
+
+enum gaokun_ec_ucsi_cmd {
+ UCSI_REG_WRITE = 0xD2,
+ UCSI_REG_READ,
+ UCSI_DATA_WRITE,
+ UCSI_DATA_READ,
+};
+
+#define UCSI_REG_SIZE 7
+
+/*
+ * For tx, command sequences are arranged as
+ * {master_cmd, slave_cmd, data_len, data_seq}
+ */
+#define REQ_HDR_SIZE 3
+#define INPUT_SIZE_OFFSET 2
+#define REQ_LEN(req) (REQ_HDR_SIZE + (req)[INPUT_SIZE_OFFSET])
+
+/*
+ * For rx, data sequences are arranged as
+ * {status, data_len(unreliable), data_seq}
+ */
+#define RESP_HDR_SIZE 2
+
+#define MKREQ(REG0, REG1, SIZE, ...) \
+{ \
+ REG0, REG1, SIZE, \
+ /* ## will remove comma when SIZE is 0 */ \
+ ## __VA_ARGS__, \
+ /* make sure len(pkt[3:]) >= SIZE */ \
+ [3 + (SIZE)] = 0, \
+}
+
+#define MKRESP(SIZE) \
+{ \
+ [RESP_HDR_SIZE + (SIZE) - 1] = 0, \
+}
+
+/* Possible size 1, 4, 20, 24. Most of the time, the size is 1. */
+static inline void refill_req(u8 *dest, const u8 *src, size_t size)
+{
+ memcpy(dest + REQ_HDR_SIZE, src, size);
+}
+
+static inline void refill_req_byte(u8 *dest, const u8 *src)
+{
+ dest[REQ_HDR_SIZE] = *src;
+}
+
+/* Possible size 1, 2, 4, 7, 20. Most of the time, the size is 1. */
+static inline void extr_resp(u8 *dest, const u8 *src, size_t size)
+{
+ memcpy(dest, src + RESP_HDR_SIZE, size);
+}
+
+static inline void extr_resp_byte(u8 *dest, const u8 *src)
+{
+ *dest = src[RESP_HDR_SIZE];
+}
+
+static inline void *extr_resp_shallow(const u8 *src)
+{
+ return src + RESP_HDR_SIZE;
+}
+
+struct gaokun_ec {
+ struct i2c_client *client;
+ struct mutex lock; /* EC transaction lock */
+ struct blocking_notifier_head notifier_list;
+ struct device *hwmon_dev;
+ struct input_dev *idev;
+ bool suspended;
+};
+
+static int gaokun_ec_request(struct gaokun_ec *ec, const u8 *req,
+ size_t resp_len, u8 *resp)
+{
+ struct i2c_client *client = ec->client;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = client->flags,
+ .len = REQ_LEN(req),
+ .buf = req,
+ }, {
+ .addr = client->addr,
+ .flags = client->flags | I2C_M_RD,
+ .len = resp_len,
+ .buf = resp,
+ },
+ };
+ int ret;
+
+ guard(mutex)(&ec->lock);
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret != ARRAY_SIZE(msgs)) {
+ dev_err(&client->dev, "I2C transfer error %d\n", ret);
+ goto out_after_break;
+ }
+
+ ret = *resp;
+ if (ret)
+ dev_err(&client->dev, "EC transaction error %d\n", ret);
+
+out_after_break:
+ usleep_range(2000, 2500); /* have a break, ACPI did this */
+
+ return ret;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Common API */
+
+/**
+ * gaokun_ec_read - Read from EC
+ * @ec: The gaokun_ec structure
+ * @req: The sequence to request
+ * @resp_len: The size to read
+ * @resp: The buffer to store response sequence
+ *
+ * This function is used to read data after writing a magic sequence to EC.
+ * All EC operations depend on this function.
+ *
+ * Huawei uses magic sequences everywhere to complete various functions, all
+ * these sequences are passed to ECCD(a ACPI method which is quiet similar
+ * to gaokun_ec_request), there is no good abstraction to generalize these
+ * sequences, so just wrap it for now. Almost all magic sequences are kept
+ * in this file.
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_read(struct gaokun_ec *ec, const u8 *req,
+ size_t resp_len, u8 *resp)
+{
+ return gaokun_ec_request(ec, req, resp_len, resp);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_read);
+
+/**
+ * gaokun_ec_write - Write to EC
+ * @ec: The gaokun_ec structure
+ * @req: The sequence to request
+ *
+ * This function has no big difference from gaokun_ec_read. When caller care
+ * only write status and no actual data are returned, then use it.
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_write(struct gaokun_ec *ec, const u8 *req)
+{
+ u8 ec_resp[] = MKRESP(0);
+
+ return gaokun_ec_request(ec, req, sizeof(ec_resp), ec_resp);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_write);
+
+int gaokun_ec_read_byte(struct gaokun_ec *ec, const u8 *req, u8 *byte)
+{
+ int ret;
+ u8 ec_resp[] = MKRESP(sizeof(*byte));
+
+ ret = gaokun_ec_read(ec, req, sizeof(ec_resp), ec_resp);
+ extr_resp_byte(byte, ec_resp);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_read_byte);
+
+/**
+ * gaokun_ec_register_notify - Register a notifier callback for EC events.
+ * @ec: The gaokun_ec structure
+ * @nb: Notifier block pointer to register
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_register_notify(struct gaokun_ec *ec, struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&ec->notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_register_notify);
+
+/**
+ * gaokun_ec_unregister_notify - Unregister notifier callback for EC events.
+ * @ec: The gaokun_ec structure
+ * @nb: Notifier block pointer to unregister
+ *
+ * Unregister a notifier callback that was previously registered with
+ * gaokun_ec_register_notify().
+ */
+void gaokun_ec_unregister_notify(struct gaokun_ec *ec, struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&ec->notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_unregister_notify);
+
+/* -------------------------------------------------------------------------- */
+/* API for PSY */
+
+/**
+ * gaokun_ec_psy_multi_read - Read contiguous registers
+ * @ec: The gaokun_ec structure
+ * @reg: The start register
+ * @resp_len: The number of registers to be read
+ * @resp: The buffer to store response sequence
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_psy_multi_read(struct gaokun_ec *ec, u8 reg,
+ size_t resp_len, u8 *resp)
+{
+ u8 ec_req[] = MKREQ(0x02, EC_READ, 1, 0);
+ u8 ec_resp[] = MKRESP(1);
+ int i, ret;
+
+ for (i = 0; i < resp_len; ++i, reg++) {
+ refill_req_byte(ec_req, ®);
+ ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
+ if (ret)
+ return ret;
+ extr_resp_byte(&resp[i], ec_resp);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_psy_multi_read);
+
+/* Smart charge */
+
+/**
+ * gaokun_ec_psy_get_smart_charge - Get smart charge data from EC
+ * @ec: The gaokun_ec structure
+ * @resp: The buffer to store response sequence (mode, delay, start, end)
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_psy_get_smart_charge(struct gaokun_ec *ec,
+ u8 resp[GAOKUN_SMART_CHARGE_DATA_SIZE])
+{
+ /* GBCM */
+ u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_DATA_READ, 0);
+ u8 ec_resp[] = MKRESP(GAOKUN_SMART_CHARGE_DATA_SIZE);
+ int ret;
+
+ ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
+ if (ret)
+ return ret;
+
+ extr_resp(resp, ec_resp, GAOKUN_SMART_CHARGE_DATA_SIZE);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_psy_get_smart_charge);
+
+static inline bool validate_battery_threshold_range(u8 start, u8 end)
+{
+ return end != 0 && start <= end && end <= 100;
+}
+
+/**
+ * gaokun_ec_psy_set_smart_charge - Set smart charge data
+ * @ec: The gaokun_ec structure
+ * @req: The sequence to request (mode, delay, start, end)
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_psy_set_smart_charge(struct gaokun_ec *ec,
+ const u8 req[GAOKUN_SMART_CHARGE_DATA_SIZE])
+{
+ /* SBCM */
+ u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_DATA_WRITE,
+ GAOKUN_SMART_CHARGE_DATA_SIZE);
+
+ if (!validate_battery_threshold_range(req[2], req[3]))
+ return -EINVAL;
+
+ refill_req(ec_req, req, GAOKUN_SMART_CHARGE_DATA_SIZE);
+
+ return gaokun_ec_write(ec, ec_req);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_psy_set_smart_charge);
+
+/* Smart charge enable */
+
+/**
+ * gaokun_ec_psy_get_smart_charge_enable - Get smart charge state
+ * @ec: The gaokun_ec structure
+ * @on: The state
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_psy_get_smart_charge_enable(struct gaokun_ec *ec, bool *on)
+{
+ /* GBAC */
+ u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_ENABLE_READ, 0);
+ u8 state;
+ int ret;
+
+ ret = gaokun_ec_read_byte(ec, ec_req, &state);
+ if (ret)
+ return ret;
+
+ *on = !!state;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_psy_get_smart_charge_enable);
+
+/**
+ * gaokun_ec_psy_set_smart_charge_enable - Set smart charge state
+ * @ec: The gaokun_ec structure
+ * @on: The state
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_psy_set_smart_charge_enable(struct gaokun_ec *ec, bool on)
+{
+ /* SBAC */
+ u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_ENABLE_WRITE, 1, on);
+
+ return gaokun_ec_write(ec, ec_req);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_psy_set_smart_charge_enable);
+
+/* -------------------------------------------------------------------------- */
+/* API for UCSI */
+
+/**
+ * gaokun_ec_ucsi_read - Read UCSI data from EC
+ * @ec: The gaokun_ec structure
+ * @resp: The buffer to store response sequence
+ *
+ * Read CCI and MSGI (used by UCSI subdriver).
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_ucsi_read(struct gaokun_ec *ec,
+ u8 resp[GAOKUN_UCSI_READ_SIZE])
+{
+ u8 ec_req[] = MKREQ(0x03, UCSI_DATA_READ, 0);
+ u8 ec_resp[] = MKRESP(GAOKUN_UCSI_READ_SIZE);
+ int ret;
+
+ ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
+ if (ret)
+ return ret;
+
+ extr_resp(resp, ec_resp, GAOKUN_UCSI_READ_SIZE);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_read);
+
+/**
+ * gaokun_ec_ucsi_write - Write UCSI data to EC
+ * @ec: The gaokun_ec structure
+ * @req: The sequence to request
+ *
+ * Write CTRL and MSGO (used by UCSI subdriver).
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_ucsi_write(struct gaokun_ec *ec,
+ const u8 req[GAOKUN_UCSI_WRITE_SIZE])
+{
+ u8 ec_req[] = MKREQ(0x03, UCSI_DATA_WRITE, GAOKUN_UCSI_WRITE_SIZE);
+
+ refill_req(ec_req, req, GAOKUN_UCSI_WRITE_SIZE);
+
+ return gaokun_ec_write(ec, ec_req);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_write);
+
+/**
+ * gaokun_ec_ucsi_get_reg - Get UCSI register from EC
+ * @ec: The gaokun_ec structure
+ * @ureg: The gaokun ucsi register
+ *
+ * Get UCSI register data (used by UCSI subdriver).
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_ucsi_get_reg(struct gaokun_ec *ec, struct gaokun_ucsi_reg *ureg)
+{
+ u8 ec_req[] = MKREQ(0x03, UCSI_REG_READ, 0);
+ u8 ec_resp[] = MKRESP(UCSI_REG_SIZE);
+ int ret;
+
+ ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
+ if (ret)
+ return ret;
+
+ extr_resp((u8 *)ureg, ec_resp, UCSI_REG_SIZE);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_get_reg);
+
+/**
+ * gaokun_ec_ucsi_pan_ack - Ack pin assignment notifications from EC
+ * @ec: The gaokun_ec structure
+ * @port_id: The port id receiving and handling the notifications
+ *
+ * Ack pin assignment notifications (used by UCSI subdriver).
+ *
+ * Return: 0 on success or negative error code.
+ */
+int gaokun_ec_ucsi_pan_ack(struct gaokun_ec *ec, int port_id)
+{
+ u8 ec_req[] = MKREQ(0x03, UCSI_REG_WRITE, 1);
+ u8 data = 1 << port_id;
+
+ if (port_id == GAOKUN_UCSI_NO_PORT_UPDATE)
+ data = 0;
+
+ refill_req_byte(ec_req, &data);
+
+ return gaokun_ec_write(ec, ec_req);
+}
+EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_pan_ack);
+
+/* -------------------------------------------------------------------------- */
+/* EC Sysfs */
+
+/* Fn lock */
+static int gaokun_ec_get_fn_lock(struct gaokun_ec *ec, bool *on)
+{
+ /* GFRS */
+ u8 ec_req[] = MKREQ(0x02, EC_FN_LOCK_READ, 0);
+ int ret;
+ u8 state;
+
+ ret = gaokun_ec_read_byte(ec, ec_req, &state);
+ if (ret)
+ return ret;
+
+ if (state == EC_FN_LOCK_ON)
+ *on = true;
+ else if (state == EC_FN_LOCK_OFF)
+ *on = false;
+ else
+ return -EIO;
+
+ return 0;
+}
+
+static int gaokun_ec_set_fn_lock(struct gaokun_ec *ec, bool on)
+{
+ /* SFRS */
+ u8 ec_req[] = MKREQ(0x02, EC_FN_LOCK_WRITE, 1, on ?
+ EC_FN_LOCK_ON : EC_FN_LOCK_OFF);
+
+ return gaokun_ec_write(ec, ec_req);
+}
+
+static ssize_t fn_lock_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct gaokun_ec *ec = dev_get_drvdata(dev);
+ bool on;
+ int ret;
+
+ ret = gaokun_ec_get_fn_lock(ec, &on);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", on);
+}
+
+static ssize_t fn_lock_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct gaokun_ec *ec = dev_get_drvdata(dev);
+ bool on;
+ int ret;
+
+ if (kstrtobool(buf, &on))
+ return -EINVAL;
+
+ ret = gaokun_ec_set_fn_lock(ec, on);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static DEVICE_ATTR_RW(fn_lock);
+
+static struct attribute *gaokun_ec_attrs[] = {
+ &dev_attr_fn_lock.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(gaokun_ec);
+
+/* -------------------------------------------------------------------------- */
+/* Thermal Zone HwMon */
+
+/* Range from 0 to 0x2C, partially valid */
+static const u8 temp_reg[] = {
+ 0x05, 0x07, 0x08, 0x0E, 0x0F, 0x12, 0x15, 0x1E,
+ 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
+ 0x27, 0x28, 0x29, 0x2A
+};
+
+static int gaokun_ec_get_temp(struct gaokun_ec *ec, u8 idx, long *temp)
+{
+ /* GTMP */
+ u8 ec_req[] = MKREQ(0x02, EC_TEMP_REG, 1, temp_reg[idx]);
+ u8 ec_resp[] = MKRESP(sizeof(__le16));
+ __le16 *tmp;
+ int ret;
+
+ ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
+ if (ret)
+ return ret;
+
+ tmp = (__le16 *)extr_resp_shallow(ec_resp);
+ *temp = le16_to_cpu(*tmp) * 100; /* convert to HwMon's unit */
+
+ return 0;
+}
+
+static umode_t
+gaokun_ec_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return type == hwmon_temp ? 0444 : 0;
+}
+
+static int
+gaokun_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct gaokun_ec *ec = dev_get_drvdata(dev);
+
+ if (type == hwmon_temp)
+ return gaokun_ec_get_temp(ec, channel, val);
+
+ return -EINVAL;
+}
+
+static const struct hwmon_ops gaokun_ec_hwmon_ops = {
+ .is_visible = gaokun_ec_hwmon_is_visible,
+ .read = gaokun_ec_hwmon_read,
+};
+
+static u32 gaokun_ec_temp_config[] = {
+ [0 ... ARRAY_SIZE(temp_reg) - 1] = HWMON_T_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info gaokun_ec_temp = {
+ .type = hwmon_temp,
+ .config = gaokun_ec_temp_config,
+};
+
+static const struct hwmon_channel_info * const gaokun_ec_hwmon_info[] = {
+ &gaokun_ec_temp,
+ NULL
+};
+
+static const struct hwmon_chip_info gaokun_ec_hwmon_chip_info = {
+ .ops = &gaokun_ec_hwmon_ops,
+ .info = gaokun_ec_hwmon_info,
+};
+
+/* -------------------------------------------------------------------------- */
+/* Modern Standby */
+
+static int gaokun_ec_suspend(struct device *dev)
+{
+ struct gaokun_ec *ec = dev_get_drvdata(dev);
+ u8 ec_req[] = MKREQ(0x02, EC_STANDBY_REG, 1, EC_STANDBY_ENTER);
+ int ret;
+
+ if (ec->suspended)
+ return 0;
+
+ ret = gaokun_ec_write(ec, ec_req);
+ if (ret)
+ return ret;
+
+ ec->suspended = true;
+
+ return 0;
+}
+
+static int gaokun_ec_resume(struct device *dev)
+{
+ struct gaokun_ec *ec = dev_get_drvdata(dev);
+ u8 ec_req[] = MKREQ(0x02, EC_STANDBY_REG, 1, EC_STANDBY_EXIT);
+ int ret;
+ int i;
+
+ if (!ec->suspended)
+ return 0;
+
+ for (i = 0; i < 3; ++i) {
+ ret = gaokun_ec_write(ec, ec_req);
+ if (ret == 0)
+ break;
+
+ msleep(100); /* EC need time to resume */
+ };
+
+ ec->suspended = false;
+
+ return 0;
+}
+
+static void gaokun_aux_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ kfree(adev);
+}
+
+static void gaokun_aux_remove(void *data)
+{
+ struct auxiliary_device *adev = data;
+
+ auxiliary_device_delete(adev);
+ auxiliary_device_uninit(adev);
+}
+
+static int gaokun_aux_init(struct device *parent, const char *name,
+ struct gaokun_ec *ec)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return -ENOMEM;
+
+ adev->name = name;
+ adev->id = 0;
+ adev->dev.parent = parent;
+ adev->dev.release = gaokun_aux_release;
+ adev->dev.platform_data = ec;
+ /* Allow aux devices to access parent's DT nodes directly */
+ device_set_of_node_from_dev(&adev->dev, parent);
+
+ ret = auxiliary_device_init(adev);
+ if (ret) {
+ kfree(adev);
+ return ret;
+ }
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(parent, gaokun_aux_remove, adev);
+}
+
+/* -------------------------------------------------------------------------- */
+/* EC */
+
+static irqreturn_t gaokun_ec_irq_handler(int irq, void *data)
+{
+ struct gaokun_ec *ec = data;
+ u8 ec_req[] = MKREQ(EC_EVENT, EC_QUERY, 0);
+ u8 status, id;
+ int ret;
+
+ ret = gaokun_ec_read_byte(ec, ec_req, &id);
+ if (ret)
+ return IRQ_HANDLED;
+
+ switch (id) {
+ case 0x0: /* No event */
+ break;
+
+ case EC_EVENT_LID:
+ gaokun_ec_psy_read_byte(ec, EC_LID_STATE, &status);
+ status = EC_LID_OPEN & status;
+ input_report_switch(ec->idev, SW_LID, !status);
+ input_sync(ec->idev);
+ break;
+
+ default:
+ blocking_notifier_call_chain(&ec->notifier_list, id, ec);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int gaokun_ec_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct gaokun_ec *ec;
+ int ret;
+
+ ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
+ if (!ec)
+ return -ENOMEM;
+
+ mutex_init(&ec->lock);
+ ec->client = client;
+ i2c_set_clientdata(client, ec);
+ BLOCKING_INIT_NOTIFIER_HEAD(&ec->notifier_list);
+
+ /* Lid switch */
+ ec->idev = devm_input_allocate_device(dev);
+ if (!ec->idev)
+ return -ENOMEM;
+
+ ec->idev->name = "LID";
+ ec->idev->phys = "gaokun-ec/input0";
+ input_set_capability(ec->idev, EV_SW, SW_LID);
+
+ ret = input_register_device(ec->idev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register input device\n");
+
+ ret = gaokun_aux_init(dev, GAOKUN_DEV_PSY, ec);
+ if (ret)
+ return ret;
+
+ ret = gaokun_aux_init(dev, GAOKUN_DEV_UCSI, ec);
+ if (ret)
+ return ret;
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ gaokun_ec_irq_handler, IRQF_ONESHOT,
+ dev_name(dev), ec);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to request IRQ\n");
+
+ ec->hwmon_dev = devm_hwmon_device_register_with_info(dev, "gaokun_ec_hwmon",
+ ec, &gaokun_ec_hwmon_chip_info, NULL);
+ if (IS_ERR(ec->hwmon_dev))
+ return dev_err_probe(dev, PTR_ERR(ec->hwmon_dev),
+ "Failed to register hwmon device\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id gaokun_ec_id[] = {
+ { "gaokun-ec", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, gaokun_ec_id);
+
+static const struct of_device_id gaokun_ec_of_match[] = {
+ { .compatible = "huawei,gaokun3-ec", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, gaokun_ec_of_match);
+
+static const struct dev_pm_ops gaokun_ec_pm_ops = {
+ NOIRQ_SYSTEM_SLEEP_PM_OPS(gaokun_ec_suspend, gaokun_ec_resume)
+};
+
+static struct i2c_driver gaokun_ec_driver = {
+ .driver = {
+ .name = "gaokun-ec",
+ .of_match_table = gaokun_ec_of_match,
+ .pm = &gaokun_ec_pm_ops,
+ .dev_groups = gaokun_ec_groups,
+ },
+ .probe = gaokun_ec_probe,
+ .id_table = gaokun_ec_id,
+};
+module_i2c_driver(gaokun_ec_driver);
+
+MODULE_DESCRIPTION("HUAWEI Matebook E Go EC driver");
+MODULE_AUTHOR("Pengyu Luo <mitltlatltl@xxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/huawei-gaokun-ec.h b/include/linux/platform_data/huawei-gaokun-ec.h
new file mode 100644
index 000000000..faa15d315
--- /dev/null
+++ b/include/linux/platform_data/huawei-gaokun-ec.h
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Huawei Matebook E Go Embedded Controller
+ *
+ * Copyright (C) 2024-2025 Pengyu Luo <mitltlatltl@xxxxxxxxx>
+ */
+
+#ifndef __HUAWEI_GAOKUN_EC_H__
+#define __HUAWEI_GAOKUN_EC_H__
+
+#define GAOKUN_UCSI_CCI_SIZE 4
+#define GAOKUN_UCSI_MSGI_SIZE 16
+#define GAOKUN_UCSI_READ_SIZE (GAOKUN_UCSI_CCI_SIZE + GAOKUN_UCSI_MSGI_SIZE)
+#define GAOKUN_UCSI_WRITE_SIZE 24 /* 8B CTRL, 16B MSGO */
+
+#define GAOKUN_UCSI_NO_PORT_UPDATE (-1)
+
+#define GAOKUN_SMART_CHARGE_DATA_SIZE 4 /* mode, delay, start, end */
+
+/* -------------------------------------------------------------------------- */
+
+struct gaokun_ec;
+struct gaokun_ucsi_reg;
+struct notifier_block;
+
+#define GAOKUN_MOD_NAME "huawei_gaokun_ec"
+#define GAOKUN_DEV_PSY "psy"
+#define GAOKUN_DEV_UCSI "ucsi"
+
+/* -------------------------------------------------------------------------- */
+/* Common API */
+
+int gaokun_ec_register_notify(struct gaokun_ec *ec,
+ struct notifier_block *nb);
+void gaokun_ec_unregister_notify(struct gaokun_ec *ec,
+ struct notifier_block *nb);
+
+int gaokun_ec_read(struct gaokun_ec *ec, const u8 *req,
+ size_t resp_len, u8 *resp);
+int gaokun_ec_write(struct gaokun_ec *ec, const u8 *req);
+int gaokun_ec_read_byte(struct gaokun_ec *ec, const u8 *req, u8 *byte);
+
+/* -------------------------------------------------------------------------- */
+/* API for PSY */
+
+int gaokun_ec_psy_multi_read(struct gaokun_ec *ec, u8 reg,
+ size_t resp_len, u8 *resp);
+
+static inline int gaokun_ec_psy_read_byte(struct gaokun_ec *ec,
+ u8 reg, u8 *byte)
+{
+ return gaokun_ec_psy_multi_read(ec, reg, sizeof(*byte), byte);
+}
+
+static inline int gaokun_ec_psy_read_word(struct gaokun_ec *ec,
+ u8 reg, u16 *word)
+{
+ return gaokun_ec_psy_multi_read(ec, reg, sizeof(*word), (u8 *)word);
+}
+
+int gaokun_ec_psy_get_smart_charge(struct gaokun_ec *ec,
+ u8 resp[GAOKUN_SMART_CHARGE_DATA_SIZE]);
+int gaokun_ec_psy_set_smart_charge(struct gaokun_ec *ec,
+ const u8 req[GAOKUN_SMART_CHARGE_DATA_SIZE]);
+
+int gaokun_ec_psy_get_smart_charge_enable(struct gaokun_ec *ec, bool *on);
+int gaokun_ec_psy_set_smart_charge_enable(struct gaokun_ec *ec, bool on);
+
+/* -------------------------------------------------------------------------- */
+/* API for UCSI */
+
+int gaokun_ec_ucsi_read(struct gaokun_ec *ec, u8 resp[GAOKUN_UCSI_READ_SIZE]);
+int gaokun_ec_ucsi_write(struct gaokun_ec *ec,
+ const u8 req[GAOKUN_UCSI_WRITE_SIZE]);
+
+int gaokun_ec_ucsi_get_reg(struct gaokun_ec *ec, struct gaokun_ucsi_reg *ureg);
+int gaokun_ec_ucsi_pan_ack(struct gaokun_ec *ec, int port_id);
+
+#endif /* __HUAWEI_GAOKUN_EC_H__ */
--
2.48.1
