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([2a09:bac1:76a0:dd10::2e9:62]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-219dc9f5227sm138566925ad.185.2024.12.27.09.15.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Dec 2024 09:15:32 -0800 (PST) From: Pengyu Luo To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Bryan O'Donoghue , Sebastian Reichel , Heikki Krogerus , Greg Kroah-Hartman Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, Dmitry Baryshkov , Nikita Travkin , Pengyu Luo Subject: [PATCH 2/5] platform: arm64: add Huawei Matebook E Go (sc8280xp) EC driver Date: Sat, 28 Dec 2024 01:13:50 +0800 Message-ID: <20241227171353.404432-3-mitltlatltl@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241227171353.404432-1-mitltlatltl@gmail.com> References: <20241227171353.404432-1-mitltlatltl@gmail.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There are 3 variants, Huawei released first 2 at the same time. Huawei Matebook E Go LTE(sc8180x), codename should be gaokun2. Huawei Matebook E Go(sc8280xp@3.0GHz), codename is gaokun3. Huawei Matebook E Go 2023(sc8280xp@2.69GHz). 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 yet. Different from other Qualcomm Snapdragon sc8280xp based machines, the Huawei Matebook E Go uses an embedded controller while others use something called pmic glink. This embedded controller can be used to perform a set of various functions, including, but not limited: - 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 the driver for the EC, that creates devices for UCSI, wmi and power supply devices. Signed-off-by: Pengyu Luo --- drivers/platform/arm64/Kconfig | 19 + drivers/platform/arm64/Makefile | 2 + drivers/platform/arm64/huawei-gaokun-ec.c | 598 ++++++++++++++++++ drivers/platform/arm64/huawei-gaokun-wmi.c | 283 +++++++++ .../linux/platform_data/huawei-gaokun-ec.h | 90 +++ 5 files changed, 992 insertions(+) create mode 100644 drivers/platform/arm64/huawei-gaokun-ec.c create mode 100644 drivers/platform/arm64/huawei-gaokun-wmi.c create mode 100644 include/linux/platform_data/huawei-gaokun-ec.h diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig index f88395ea3..eb7fbacf0 100644 --- a/drivers/platform/arm64/Kconfig +++ b/drivers/platform/arm64/Kconfig @@ -33,6 +33,25 @@ 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 (sc8280xp) Embedded Controller driver" + depends on ARCH_QCOM || COMPILE_TEST + depends on I2C + depends on DRM + depends on POWER_SUPPLY + depends on INPUT + help + Say Y here to enable the EC driver for Huawei Matebook E Go 2in1 + 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..ed32ad6c0 100644 --- a/drivers/platform/arm64/Makefile +++ b/drivers/platform/arm64/Makefile @@ -6,4 +6,6 @@ # obj-$(CONFIG_EC_ACER_ASPIRE1) += acer-aspire1-ec.o +obj-$(CONFIG_EC_HUAWEI_GAOKUN) += huawei-gaokun-ec.o +obj-$(CONFIG_EC_HUAWEI_GAOKUN) += huawei-gaokun-wmi.o obj-$(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..c1c657f7b --- /dev/null +++ b/drivers/platform/arm64/huawei-gaokun-ec.c @@ -0,0 +1,598 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * huawei-gaokun-ec - An EC driver for HUAWEI Matebook E Go (sc8280xp) + * + * reference: drivers/platform/arm64/acer-aspire1-ec.c + * drivers/platform/arm64/lenovo-yoga-c630.c + * + * Copyright (C) 2024 Pengyu Luo + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#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_EVENT_LID 0x81 + +#define EC_LID_STATE 0x80 +#define EC_LID_OPEN BIT(1) + +#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 INPUT_DATA_OFFSET 3 + +/* for rx, data sequences are arranged as + * {status, data_len(unreliable), data_seq} + */ +#define RESP_HDR_SIZE 2 +#define DATA_OFFSET 2 + + +struct gaokun_ec { + struct i2c_client *client; + struct mutex lock; + struct blocking_notifier_head notifier_list; + 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[2] = { + { + .addr = client->addr, + .flags = client->flags, + .len = req[INPUT_SIZE_OFFSET] + REQ_HDR_SIZE, + .buf = req, + }, { + .addr = client->addr, + .flags = client->flags | I2C_M_RD, + .len = resp_len, + .buf = resp, + }, + }; + + mutex_lock(&ec->lock); + + i2c_transfer(client->adapter, msgs, 2); + usleep_range(2000, 2500); + + mutex_unlock(&ec->lock); + + return *resp; +} + +/* -------------------------------------------------------------------------- */ +/* Common API */ + +/** + * gaokun_ec_read - read from EC + * @ec: The gaokun_ec + * @req: The sequence to request + * @resp_len: The size to read + * @resp: Where the data are read to + * + * This function is used to read data after writing a magic sequence to EC. + * All EC operations dependent on this functions. + * + * 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. + */ +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 + * @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 returnd, then use it. + */ +int gaokun_ec_write(struct gaokun_ec *ec, u8 *req) +{ + u8 resp[RESP_HDR_SIZE]; + + return gaokun_ec_request(ec, req, sizeof(resp), resp); +} +EXPORT_SYMBOL_GPL(gaokun_ec_write); + +int gaokun_ec_read_byte(struct gaokun_ec *ec, u8 *req, u8 *byte) +{ + int ret; + u8 resp[RESP_HDR_SIZE + sizeof(*byte)]; + + ret = gaokun_ec_read(ec, req, sizeof(resp), resp); + *byte = resp[DATA_OFFSET]; + + return ret; +} +EXPORT_SYMBOL_GPL(gaokun_ec_read_byte); + +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); + +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 */ + +int gaokun_ec_psy_multi_read(struct gaokun_ec *ec, u8 reg, + size_t resp_len, u8 *resp) +{ + int i, ret; + u8 _resp[RESP_HDR_SIZE + 1]; + u8 req[REQ_HDR_SIZE + 1] = {0x02, EC_READ, 1, }; + + for (i = 0; i < resp_len; ++i) { + req[INPUT_DATA_OFFSET] = reg++; + ret = gaokun_ec_read(ec, req, sizeof(_resp), _resp); + if (ret) + return -EIO; + resp[i] = _resp[DATA_OFFSET]; + } + + return 0; +} +EXPORT_SYMBOL_GPL(gaokun_ec_psy_multi_read); + +/* -------------------------------------------------------------------------- */ +/* API For WMI */ + +/* Battery charging threshold */ +int gaokun_ec_wmi_get_threshold(struct gaokun_ec *ec, u8 *value, int ind) +{ + /* GBTT */ + return gaokun_ec_read_byte(ec, (u8 []){0x02, 0x69, 1, ind}, value); +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_get_threshold); + +int gaokun_ec_wmi_set_threshold(struct gaokun_ec *ec, u8 start, u8 end) +{ + /* SBTT */ + int ret; + u8 req[REQ_HDR_SIZE + 2] = {0x02, 0x68, 2, 3, 0x5a}; + + ret = gaokun_ec_write(ec, req); + if (ret) + return -EIO; + + if (start == 0 && end == 0) + return -EINVAL; + + if (start >= 0 && start <= end && end <= 100) { + req[INPUT_DATA_OFFSET] = 1; + req[INPUT_DATA_OFFSET + 1] = start; + ret = gaokun_ec_write(ec, req); + if (ret) + return -EIO; + + req[INPUT_DATA_OFFSET] = 2; + req[INPUT_DATA_OFFSET + 1] = end; + ret = gaokun_ec_write(ec, req); + } else { + return -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_set_threshold); + +/* Smart charge param */ +int gaokun_ec_wmi_get_smart_charge_param(struct gaokun_ec *ec, u8 *value) +{ + /* GBAC */ + return gaokun_ec_read_byte(ec, (u8 []){0x02, 0xE6, 0}, value); +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_get_smart_charge_param); + +int gaokun_ec_wmi_set_smart_charge_param(struct gaokun_ec *ec, u8 value) +{ + /* SBAC */ + if (value < 0 || value > 2) + return -EINVAL; + + return gaokun_ec_write(ec, (u8 []){0x02, 0xE5, 1, value}); +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_set_smart_charge_param); + +/* Smart charge */ +int gaokun_ec_wmi_get_smart_charge(struct gaokun_ec *ec, + u8 data[GAOKUN_SMART_CHARGE_DATA_SIZE]) +{ + /* GBCM */ + u8 req[REQ_HDR_SIZE] = {0x02, 0xE4, 0}; + u8 resp[RESP_HDR_SIZE + 4]; + int ret; + + ret = gaokun_ec_read(ec, req, sizeof(resp), resp); + if (ret) + return -EIO; + + data[0] = resp[DATA_OFFSET]; + data[1] = resp[DATA_OFFSET + 1]; + data[2] = resp[DATA_OFFSET + 2]; + data[3] = resp[DATA_OFFSET + 3]; + + return 0; +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_get_smart_charge); + +int gaokun_ec_wmi_set_smart_charge(struct gaokun_ec *ec, + u8 data[GAOKUN_SMART_CHARGE_DATA_SIZE]) +{ + /* SBCM */ + u8 req[REQ_HDR_SIZE + GAOKUN_SMART_CHARGE_DATA_SIZE] = {0x02, 0XE3, 4,}; + + if (!(data[2] >= 0 && data[2] <= data[3] && data[3] <= 100)) + return -EINVAL; + + memcpy(req + INPUT_DATA_OFFSET, data, GAOKUN_SMART_CHARGE_DATA_SIZE); + + return gaokun_ec_write(ec, req); +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_set_smart_charge); + +/* Fn lock */ +int gaokun_ec_wmi_get_fn_lock(struct gaokun_ec *ec, u8 *on) +{ + /* GFRS */ + int ret; + u8 val; + u8 req[REQ_HDR_SIZE] = {0x02, 0x6B, 0}; + + ret = gaokun_ec_read_byte(ec, req, &val); + if (val == 0x55) + *on = 0; + else if (val == 0x5A) + *on = 1; + else + return -EIO; + + return ret; +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_get_fn_lock); + +int gaokun_ec_wmi_set_fn_lock(struct gaokun_ec *ec, u8 on) +{ + /* SFRS */ + u8 req[REQ_HDR_SIZE + 1] = {0x02, 0x6C, 1,}; + + if (on == 0) + req[INPUT_DATA_OFFSET] = 0x55; + else if (on == 1) + req[INPUT_DATA_OFFSET] = 0x5A; + else + return -EINVAL; + + return gaokun_ec_write(ec, req); +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_set_fn_lock); + +/* Thermal Zone */ +/* Range from 0 to 0x2C, partial 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}; + +int gaokun_ec_wmi_get_temp(struct gaokun_ec *ec, s16 temp[GAOKUN_TZ_REG_NUM]) +{ + /* GTMP */ + u8 req[REQ_HDR_SIZE] = {0x02, 0x61, 1,}; + u8 resp[RESP_HDR_SIZE + sizeof(s16)]; + int ret, i = 0; + + while (i < GAOKUN_TZ_REG_NUM) { + req[INPUT_DATA_OFFSET] = temp_reg[i]; + ret = gaokun_ec_read(ec, req, sizeof(resp), resp); + if (ret) + return -EIO; + temp[i++] = *(s16 *)(resp + DATA_OFFSET); + } + + return 0; +} +EXPORT_SYMBOL_GPL(gaokun_ec_wmi_get_temp); + +/* -------------------------------------------------------------------------- */ +/* API For UCSI */ + +int gaokun_ec_ucsi_read(struct gaokun_ec *ec, + u8 resp[GAOKUN_UCSI_READ_SIZE]) +{ + u8 req[REQ_HDR_SIZE] = {0x3, 0xD5, 0}; + u8 _resp[RESP_HDR_SIZE + GAOKUN_UCSI_READ_SIZE]; + int ret; + + ret = gaokun_ec_read(ec, req, sizeof(_resp), _resp); + if (ret) + return ret; + + memcpy(resp, _resp + DATA_OFFSET, GAOKUN_UCSI_READ_SIZE); + return 0; +} +EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_read); + +int gaokun_ec_ucsi_write(struct gaokun_ec *ec, + const u8 req[GAOKUN_UCSI_WRITE_SIZE]) +{ + u8 _req[REQ_HDR_SIZE + GAOKUN_UCSI_WRITE_SIZE]; + + _req[0] = 0x03; + _req[1] = 0xD4; + _req[INPUT_SIZE_OFFSET] = GAOKUN_UCSI_WRITE_SIZE; + memcpy(_req + INPUT_DATA_OFFSET, req, GAOKUN_UCSI_WRITE_SIZE); + + return gaokun_ec_write(ec, _req); +} +EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_write); + +int gaokun_ec_ucsi_get_reg(struct gaokun_ec *ec, u8 *ureg) +{ + u8 req[REQ_HDR_SIZE] = {0x03, 0xD3, 0}; + u8 _resp[RESP_HDR_SIZE + UCSI_REG_SIZE]; + int ret; + + ret = gaokun_ec_read(ec, req, sizeof(_resp), _resp); + if (ret) + return ret; + + memcpy(ureg, _resp + DATA_OFFSET, UCSI_REG_SIZE); + + return 0; +} +EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_get_reg); + +int gaokun_ec_ucsi_pan_ack(struct gaokun_ec *ec, int port_id) +{ + u8 req[REQ_HDR_SIZE + 1] = {0x03, 0xD2, 1, 0}; + + if (port_id >= 0) + req[INPUT_DATA_OFFSET] = 1 << port_id; + + return gaokun_ec_write(ec, req); +} +EXPORT_SYMBOL_GPL(gaokun_ec_ucsi_pan_ack); + +/* -------------------------------------------------------------------------- */ +/* Modern Standby */ + +static int gaokun_ec_suspend(struct device *dev) +{ + struct gaokun_ec *ec = dev_get_drvdata(dev); + u8 req[REQ_HDR_SIZE + 1] = {0x02, 0xB2, 1, 0xDB}; + int ret; + + if (ec->suspended) + return 0; + + ret = gaokun_ec_write(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 req[REQ_HDR_SIZE + 1] = {0x02, 0xB2, 1, 0xEB}; + int ret; + int i; + + if (!ec->suspended) + return 0; + + for (i = 0; i < 3; i++) { + ret = gaokun_ec_write(ec, req); + if (ret == 0) + break; + + msleep(100); + }; + + 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 req[REQ_HDR_SIZE] = {EC_EVENT, EC_QUERY, 0}; + u8 status, id; + int ret; + + ret = gaokun_ec_read_byte(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, "psy", ec); + if (ret) + return ret; + + ret = gaokun_aux_init(dev, "wmi", ec); + if (ret) + return ret; + + ret = gaokun_aux_init(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"); + + 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,gaokun-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, + }, + .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 "); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/arm64/huawei-gaokun-wmi.c b/drivers/platform/arm64/huawei-gaokun-wmi.c new file mode 100644 index 000000000..793cb1659 --- /dev/null +++ b/drivers/platform/arm64/huawei-gaokun-wmi.c @@ -0,0 +1,283 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * huawei-gaokun-wmi - A WMI driver for HUAWEI Matebook E Go (sc8280xp) + * + * reference: drivers/platform/x86/huawei-wmi.c + * + * Copyright (C) 2024 Pengyu Luo + */ + +#include +#include +#include +#include +#include + +#include + +struct gaokun_wmi { + struct gaokun_ec *ec; + struct device *dev; + struct platform_device *wmi; +}; + +/* -------------------------------------------------------------------------- */ +/* Battery charging threshold */ + +enum gaokun_wmi_threshold_ind { + START = 1, + END = 2, +}; + +static ssize_t charge_control_thresholds_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 start, end; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + ret = gaokun_ec_wmi_get_threshold(ecwmi->ec, &start, START) + || gaokun_ec_wmi_get_threshold(ecwmi->ec, &end, END); + if (ret) + return ret; + + return sysfs_emit(buf, "%d %d\n", start, end); +} + +static ssize_t charge_control_thresholds_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + u8 start, end; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + if (sscanf(buf, "%hhd %hhd", &start, &end) != 2) + return -EINVAL; + + ret = gaokun_ec_wmi_set_threshold(ecwmi->ec, start, end); + if (ret) + return ret; + + return size; +} + +static DEVICE_ATTR_RW(charge_control_thresholds); + +/* -------------------------------------------------------------------------- */ +/* Smart charge param */ + +static ssize_t smart_charge_param_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 value; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + ret = gaokun_ec_wmi_get_smart_charge_param(ecwmi->ec, &value); + if (ret) + return ret; + + return sysfs_emit(buf, "%d\n", value); +} + +static ssize_t smart_charge_param_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + u8 value; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + if (kstrtou8(buf, 10, &value)) + return -EINVAL; + + ret = gaokun_ec_wmi_set_smart_charge_param(ecwmi->ec, value); + if (ret) + return ret; + + return size; +} + +static DEVICE_ATTR_RW(smart_charge_param); + +/* -------------------------------------------------------------------------- */ +/* Smart charge */ + +static ssize_t smart_charge_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 bf[GAOKUN_SMART_CHARGE_DATA_SIZE]; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + ret = gaokun_ec_wmi_get_smart_charge(ecwmi->ec, bf); + if (ret) + return ret; + + return sysfs_emit(buf, "%d %d %d %d\n", + bf[0], bf[1], bf[2], bf[3]); +} + +static ssize_t smart_charge_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + u8 bf[GAOKUN_SMART_CHARGE_DATA_SIZE]; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + if (sscanf(buf, "%hhd %hhd %hhd %hhd", bf, bf + 1, bf + 2, bf + 3) != 4) + return -EINVAL; + + ret = gaokun_ec_wmi_set_smart_charge(ecwmi->ec, bf); + if (ret) + return ret; + + return size; +} + +static DEVICE_ATTR_RW(smart_charge); + +/* -------------------------------------------------------------------------- */ +/* Fn lock */ + +static ssize_t fn_lock_state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int ret; + u8 on; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + ret = gaokun_ec_wmi_get_fn_lock(ecwmi->ec, &on); + if (ret) + return ret; + + return sysfs_emit(buf, "%d\n", on); +} + +static ssize_t fn_lock_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + u8 on; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + if (kstrtou8(buf, 10, &on)) + return -EINVAL; + + ret = gaokun_ec_wmi_set_fn_lock(ecwmi->ec, on); + if (ret) + return ret; + + return size; +} + +static DEVICE_ATTR_RW(fn_lock_state); + +/* -------------------------------------------------------------------------- */ +/* Thermal Zone */ + +static ssize_t temperature_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + + int ret, len, i; + char *ptr = buf; + s16 value; + s16 temp[GAOKUN_TZ_REG_NUM]; + struct gaokun_wmi *ecwmi = dev_get_drvdata(dev); + + ret = gaokun_ec_wmi_get_temp(ecwmi->ec, temp); + if (ret) + return ret; + + i = 0; + len = 0; + while (i < GAOKUN_TZ_REG_NUM) { + value = temp[i++]; + if (value < 0) { + len += sprintf(ptr + len, "-"); + value = -value; + } + len += sprintf(ptr + len, "%d.%d ", value / 10, value % 10); + } + len += sprintf(ptr + len, "\n"); + + return len; +} + +static DEVICE_ATTR_RO(temperature); + +static struct attribute *gaokun_wmi_features_attrs[] = { + &dev_attr_charge_control_thresholds.attr, + &dev_attr_smart_charge_param.attr, + &dev_attr_smart_charge.attr, + &dev_attr_fn_lock_state.attr, + &dev_attr_temperature.attr, + NULL, +}; +ATTRIBUTE_GROUPS(gaokun_wmi_features); + +static int gaokun_wmi_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct gaokun_ec *ec = adev->dev.platform_data; + struct device *dev = &adev->dev; + struct gaokun_wmi *ecwmi; + + ecwmi = devm_kzalloc(&adev->dev, sizeof(*ecwmi), GFP_KERNEL); + if (!ecwmi) + return -ENOMEM; + + ecwmi->ec = ec; + ecwmi->dev = dev; + + auxiliary_set_drvdata(adev, ecwmi); + + /* make it under /sys/devices/platform, convenient for sysfs I/O, + * while adev is under + * /sys/devices/platform/soc@0/ac0000.geniqup/a9c000.i2c/i2c-15/15-0038/ + */ + ecwmi->wmi = platform_device_register_simple("gaokun-wmi", -1, NULL, 0); + if (IS_ERR(ecwmi->wmi)) + return dev_err_probe(dev, PTR_ERR(ecwmi->wmi), + "Failed to register wmi platform device\n"); + + platform_set_drvdata(ecwmi->wmi, ecwmi); + + return device_add_groups(&ecwmi->wmi->dev, gaokun_wmi_features_groups); +} + +static void gaokun_wmi_remove(struct auxiliary_device *adev) +{ + struct gaokun_wmi *ecwmi = auxiliary_get_drvdata(adev); + struct platform_device *wmi = ecwmi->wmi; + + device_remove_groups(&wmi->dev, gaokun_wmi_features_groups); + platform_device_unregister(ecwmi->wmi); +} + +static const struct auxiliary_device_id gaokun_wmi_id_table[] = { + { .name = GAOKUN_MOD_NAME "." GAOKUN_DEV_WMI, }, + {} +}; +MODULE_DEVICE_TABLE(auxiliary, gaokun_wmi_id_table); + +static struct auxiliary_driver gaokun_wmi_driver = { + .name = GAOKUN_DEV_WMI, + .id_table = gaokun_wmi_id_table, + .probe = gaokun_wmi_probe, + .remove = gaokun_wmi_remove, +}; + +module_auxiliary_driver(gaokun_wmi_driver); + +MODULE_DESCRIPTION("HUAWEI Matebook E Go WMI driver"); +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..a649e9ecf --- /dev/null +++ b/include/linux/platform_data/huawei-gaokun-ec.h @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Huawei Matebook E Go (sc8280xp) Embedded Controller + * + * Copyright (C) 2024 Pengyu Luo + * + */ + +#ifndef __HUAWEI_GAOKUN_EC_H__ +#define __HUAWEI_GAOKUN_EC_H__ + +#define GAOKUN_UCSI_CCI_SIZE 4 +#define GAOKUN_UCSI_DATA_SIZE 16 +#define GAOKUN_UCSI_READ_SIZE (GAOKUN_UCSI_CCI_SIZE + GAOKUN_UCSI_DATA_SIZE) +#define GAOKUN_UCSI_WRITE_SIZE 0x18 + +#define GAOKUN_TZ_REG_NUM 20 +#define GAOKUN_SMART_CHARGE_DATA_SIZE 4 /* mode, delay, start, end */ + +/* -------------------------------------------------------------------------- */ + +struct gaokun_ec; +struct notifier_block; + +#define GAOKUN_MOD_NAME "huawei_gaokun_ec" +#define GAOKUN_DEV_PSY "psy" +#define GAOKUN_DEV_WMI "wmi" +#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, u8 *req); +int gaokun_ec_read_byte(struct gaokun_ec *ec, 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, 1, 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, 2, (u8 *)word); +} + +/* -------------------------------------------------------------------------- */ +/* API For WMI */ + +int gaokun_ec_wmi_get_threshold(struct gaokun_ec *ec, u8 *value, int ind); +int gaokun_ec_wmi_set_threshold(struct gaokun_ec *ec, u8 start, u8 end); + +int gaokun_ec_wmi_get_smart_charge_param(struct gaokun_ec *ec, u8 *value); +int gaokun_ec_wmi_set_smart_charge_param(struct gaokun_ec *ec, u8 value); + +int gaokun_ec_wmi_get_smart_charge(struct gaokun_ec *ec, + u8 data[GAOKUN_SMART_CHARGE_DATA_SIZE]); +int gaokun_ec_wmi_set_smart_charge(struct gaokun_ec *ec, + u8 data[GAOKUN_SMART_CHARGE_DATA_SIZE]); + +int gaokun_ec_wmi_get_fn_lock(struct gaokun_ec *ec, u8 *on); +int gaokun_ec_wmi_set_fn_lock(struct gaokun_ec *ec, u8 on); + +int gaokun_ec_wmi_get_temp(struct gaokun_ec *ec, s16 temp[GAOKUN_TZ_REG_NUM]); + +/* -------------------------------------------------------------------------- */ +/* 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, u8 *ureg); +int gaokun_ec_ucsi_pan_ack(struct gaokun_ec *ec, int port_id); + + +#endif /* __HUAWEI_GAOKUN_EC_H__ */