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platform: arm64: add Huawei Matebook E Go EC driver
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 Also thanks for reviewers' working. They have made this patch improve a lot. [1] https://bugzilla.kernel.org/show_bug.cgi?id=219645 Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20250214180656.28599-3-mitltlatltl@gmail.com Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Pengyu Luo
Ilpo Järvinen
parent
defcf2fb30
commit
7636f090d0
@ -10698,6 +10698,13 @@ S: Maintained
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F: Documentation/networking/device_drivers/ethernet/huawei/hinic.rst
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F: drivers/net/ethernet/huawei/hinic/
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HUAWEI MATEBOOK E GO EMBEDDED CONTROLLER DRIVER
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M: Pengyu Luo <mitltlatltl@gmail.com>
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S: Maintained
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F: Documentation/devicetree/bindings/platform/huawei,gaokun-ec.yaml
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F: drivers/platform/arm64/huawei-gaokun-ec.c
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F: include/linux/platform_data/huawei-gaokun-ec.h
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HUGETLB SUBSYSTEM
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M: Muchun Song <muchun.song@linux.dev>
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L: linux-mm@kvack.org
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@ -33,6 +33,27 @@ config EC_ACER_ASPIRE1
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laptop where this information is not properly exposed via the
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standard ACPI devices.
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config EC_HUAWEI_GAOKUN
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tristate "Huawei Matebook E Go Embedded Controller driver"
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depends on ARCH_QCOM || COMPILE_TEST
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depends on I2C
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depends on INPUT
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depends on HWMON
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select AUXILIARY_BUS
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help
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Say Y here to enable the EC driver for the Huawei Matebook E Go
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which is a sc8280xp-based 2-in-1 tablet. The driver handles battery
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(information, charge control) and USB Type-C DP HPD events as well
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as some misc functions like the lid sensor and temperature sensors,
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etc.
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This driver provides battery and AC status support for the mentioned
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laptop where this information is not properly exposed via the
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standard ACPI devices.
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Say M or Y here to include this support.
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config EC_LENOVO_YOGA_C630
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tristate "Lenovo Yoga C630 Embedded Controller driver"
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depends on ARCH_QCOM || COMPILE_TEST
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@ -6,4 +6,5 @@
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#
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obj-$(CONFIG_EC_ACER_ASPIRE1) += acer-aspire1-ec.o
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obj-$(CONFIG_EC_HUAWEI_GAOKUN) += huawei-gaokun-ec.o
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obj-$(CONFIG_EC_LENOVO_YOGA_C630) += lenovo-yoga-c630.o
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825
drivers/platform/arm64/huawei-gaokun-ec.c
Normal file
825
drivers/platform/arm64/huawei-gaokun-ec.c
Normal file
@ -0,0 +1,825 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* huawei-gaokun-ec - An EC driver for HUAWEI Matebook E Go
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*
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* Copyright (C) 2024-2025 Pengyu Luo <mitltlatltl@gmail.com>
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*/
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#include <linux/auxiliary_bus.h>
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#include <linux/cleanup.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/notifier.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_data/huawei-gaokun-ec.h>
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#define EC_EVENT 0x06
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/* Also can be found in ACPI specification 12.3 */
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#define EC_READ 0x80
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#define EC_WRITE 0x81
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#define EC_BURST 0x82
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#define EC_QUERY 0x84
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#define EC_FN_LOCK_ON 0x5A
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#define EC_FN_LOCK_OFF 0x55
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#define EC_FN_LOCK_READ 0x6B
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#define EC_FN_LOCK_WRITE 0x6C
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#define EC_EVENT_LID 0x81
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#define EC_LID_STATE 0x80
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#define EC_LID_OPEN BIT(1)
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#define EC_TEMP_REG 0x61
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#define EC_STANDBY_REG 0xB2
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#define EC_STANDBY_ENTER 0xDB
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#define EC_STANDBY_EXIT 0xEB
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enum gaokun_ec_smart_charge_cmd {
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SMART_CHARGE_DATA_WRITE = 0xE3,
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SMART_CHARGE_DATA_READ,
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SMART_CHARGE_ENABLE_WRITE,
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SMART_CHARGE_ENABLE_READ,
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};
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enum gaokun_ec_ucsi_cmd {
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UCSI_REG_WRITE = 0xD2,
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UCSI_REG_READ,
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UCSI_DATA_WRITE,
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UCSI_DATA_READ,
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};
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#define UCSI_REG_SIZE 7
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/*
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* For tx, command sequences are arranged as
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* {master_cmd, slave_cmd, data_len, data_seq}
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*/
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#define REQ_HDR_SIZE 3
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#define INPUT_SIZE_OFFSET 2
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#define REQ_LEN(req) (REQ_HDR_SIZE + (req)[INPUT_SIZE_OFFSET])
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/*
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* For rx, data sequences are arranged as
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* {status, data_len(unreliable), data_seq}
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*/
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#define RESP_HDR_SIZE 2
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#define MKREQ(REG0, REG1, SIZE, ...) \
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{ \
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REG0, REG1, SIZE, \
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/* ## will remove comma when SIZE is 0 */ \
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## __VA_ARGS__, \
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/* make sure len(pkt[3:]) >= SIZE */ \
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[3 + (SIZE)] = 0, \
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}
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#define MKRESP(SIZE) \
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{ \
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[RESP_HDR_SIZE + (SIZE) - 1] = 0, \
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}
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/* Possible size 1, 4, 20, 24. Most of the time, the size is 1. */
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static inline void refill_req(u8 *dest, const u8 *src, size_t size)
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{
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memcpy(dest + REQ_HDR_SIZE, src, size);
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}
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static inline void refill_req_byte(u8 *dest, const u8 *src)
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{
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dest[REQ_HDR_SIZE] = *src;
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}
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/* Possible size 1, 2, 4, 7, 20. Most of the time, the size is 1. */
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static inline void extr_resp(u8 *dest, const u8 *src, size_t size)
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{
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memcpy(dest, src + RESP_HDR_SIZE, size);
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}
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static inline void extr_resp_byte(u8 *dest, const u8 *src)
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{
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*dest = src[RESP_HDR_SIZE];
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}
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static inline void *extr_resp_shallow(const u8 *src)
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{
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return (void *)(src + RESP_HDR_SIZE);
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}
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struct gaokun_ec {
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struct i2c_client *client;
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struct mutex lock; /* EC transaction lock */
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struct blocking_notifier_head notifier_list;
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struct device *hwmon_dev;
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struct input_dev *idev;
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bool suspended;
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};
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static int gaokun_ec_request(struct gaokun_ec *ec, const u8 *req,
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size_t resp_len, u8 *resp)
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{
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struct i2c_client *client = ec->client;
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = client->flags,
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.len = REQ_LEN(req),
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.buf = (void *)req,
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}, {
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.addr = client->addr,
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.flags = client->flags | I2C_M_RD,
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.len = resp_len,
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.buf = resp,
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},
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};
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int ret;
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guard(mutex)(&ec->lock);
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret != ARRAY_SIZE(msgs)) {
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dev_err(&client->dev, "I2C transfer error %d\n", ret);
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goto out_after_break;
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}
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ret = *resp;
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if (ret)
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dev_err(&client->dev, "EC transaction error %d\n", ret);
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out_after_break:
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usleep_range(2000, 2500); /* have a break, ACPI did this */
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return ret;
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}
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/* -------------------------------------------------------------------------- */
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/* Common API */
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/**
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* gaokun_ec_read - Read from EC
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* @ec: The gaokun_ec structure
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* @req: The sequence to request
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* @resp_len: The size to read
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* @resp: The buffer to store response sequence
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*
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* This function is used to read data after writing a magic sequence to EC.
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* All EC operations depend on this function.
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*
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* Huawei uses magic sequences everywhere to complete various functions, all
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* these sequences are passed to ECCD(a ACPI method which is quiet similar
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* to gaokun_ec_request), there is no good abstraction to generalize these
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* sequences, so just wrap it for now. Almost all magic sequences are kept
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* in this file.
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_read(struct gaokun_ec *ec, const u8 *req,
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size_t resp_len, u8 *resp)
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{
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return gaokun_ec_request(ec, req, resp_len, resp);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_read);
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/**
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* gaokun_ec_write - Write to EC
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* @ec: The gaokun_ec structure
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* @req: The sequence to request
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*
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* This function has no big difference from gaokun_ec_read. When caller care
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* only write status and no actual data are returned, then use it.
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_write(struct gaokun_ec *ec, const u8 *req)
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{
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u8 ec_resp[] = MKRESP(0);
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return gaokun_ec_request(ec, req, sizeof(ec_resp), ec_resp);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_write);
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int gaokun_ec_read_byte(struct gaokun_ec *ec, const u8 *req, u8 *byte)
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{
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int ret;
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u8 ec_resp[] = MKRESP(sizeof(*byte));
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ret = gaokun_ec_read(ec, req, sizeof(ec_resp), ec_resp);
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extr_resp_byte(byte, ec_resp);
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return ret;
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_read_byte);
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/**
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* gaokun_ec_register_notify - Register a notifier callback for EC events.
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* @ec: The gaokun_ec structure
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* @nb: Notifier block pointer to register
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_register_notify(struct gaokun_ec *ec, struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&ec->notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_register_notify);
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/**
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* gaokun_ec_unregister_notify - Unregister notifier callback for EC events.
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* @ec: The gaokun_ec structure
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* @nb: Notifier block pointer to unregister
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*
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* Unregister a notifier callback that was previously registered with
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* gaokun_ec_register_notify().
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*/
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void gaokun_ec_unregister_notify(struct gaokun_ec *ec, struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&ec->notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_unregister_notify);
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/* -------------------------------------------------------------------------- */
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/* API for PSY */
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/**
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* gaokun_ec_psy_multi_read - Read contiguous registers
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* @ec: The gaokun_ec structure
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* @reg: The start register
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* @resp_len: The number of registers to be read
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* @resp: The buffer to store response sequence
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_psy_multi_read(struct gaokun_ec *ec, u8 reg,
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size_t resp_len, u8 *resp)
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{
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u8 ec_req[] = MKREQ(0x02, EC_READ, 1, 0);
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u8 ec_resp[] = MKRESP(1);
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int i, ret;
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for (i = 0; i < resp_len; ++i, reg++) {
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refill_req_byte(ec_req, ®);
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ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
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if (ret)
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return ret;
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extr_resp_byte(&resp[i], ec_resp);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_psy_multi_read);
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/* Smart charge */
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/**
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* gaokun_ec_psy_get_smart_charge - Get smart charge data from EC
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* @ec: The gaokun_ec structure
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* @resp: The buffer to store response sequence (mode, delay, start, end)
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_psy_get_smart_charge(struct gaokun_ec *ec,
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u8 resp[GAOKUN_SMART_CHARGE_DATA_SIZE])
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{
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/* GBCM */
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u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_DATA_READ, 0);
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u8 ec_resp[] = MKRESP(GAOKUN_SMART_CHARGE_DATA_SIZE);
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int ret;
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ret = gaokun_ec_read(ec, ec_req, sizeof(ec_resp), ec_resp);
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if (ret)
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return ret;
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extr_resp(resp, ec_resp, GAOKUN_SMART_CHARGE_DATA_SIZE);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_psy_get_smart_charge);
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static inline bool validate_battery_threshold_range(u8 start, u8 end)
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{
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return end != 0 && start <= end && end <= 100;
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}
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/**
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* gaokun_ec_psy_set_smart_charge - Set smart charge data
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* @ec: The gaokun_ec structure
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* @req: The sequence to request (mode, delay, start, end)
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_psy_set_smart_charge(struct gaokun_ec *ec,
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const u8 req[GAOKUN_SMART_CHARGE_DATA_SIZE])
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{
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/* SBCM */
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u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_DATA_WRITE,
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GAOKUN_SMART_CHARGE_DATA_SIZE);
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if (!validate_battery_threshold_range(req[2], req[3]))
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return -EINVAL;
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refill_req(ec_req, req, GAOKUN_SMART_CHARGE_DATA_SIZE);
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return gaokun_ec_write(ec, ec_req);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_psy_set_smart_charge);
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/* Smart charge enable */
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/**
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* gaokun_ec_psy_get_smart_charge_enable - Get smart charge state
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* @ec: The gaokun_ec structure
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* @on: The state
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_psy_get_smart_charge_enable(struct gaokun_ec *ec, bool *on)
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{
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/* GBAC */
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u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_ENABLE_READ, 0);
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u8 state;
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int ret;
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ret = gaokun_ec_read_byte(ec, ec_req, &state);
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if (ret)
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return ret;
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*on = !!state;
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return 0;
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_psy_get_smart_charge_enable);
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/**
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* gaokun_ec_psy_set_smart_charge_enable - Set smart charge state
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* @ec: The gaokun_ec structure
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* @on: The state
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*
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* Return: 0 on success or negative error code.
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*/
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int gaokun_ec_psy_set_smart_charge_enable(struct gaokun_ec *ec, bool on)
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{
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/* SBAC */
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u8 ec_req[] = MKREQ(0x02, SMART_CHARGE_ENABLE_WRITE, 1, on);
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return gaokun_ec_write(ec, ec_req);
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}
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EXPORT_SYMBOL_GPL(gaokun_ec_psy_set_smart_charge_enable);
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/* -------------------------------------------------------------------------- */
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/* API for UCSI */
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/**
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* gaokun_ec_ucsi_read - Read UCSI data from EC
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* @ec: The gaokun_ec structure
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* @resp: The buffer to store response sequence
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*
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* Read CCI and MSGI (used by UCSI subdriver).
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*
|
||||
* 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;
|
||||
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;
|
||||
|
||||
ret = devm_mutex_init(dev, &ec->lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
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@gmail.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
79
include/linux/platform_data/huawei-gaokun-ec.h
Normal file
79
include/linux/platform_data/huawei-gaokun-ec.h
Normal file
@ -0,0 +1,79 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* Huawei Matebook E Go Embedded Controller
|
||||
*
|
||||
* Copyright (C) 2024-2025 Pengyu Luo <mitltlatltl@gmail.com>
|
||||
*/
|
||||
|
||||
#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__ */
|
||||
Loading…
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Reference in New Issue
Block a user