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Message-ID: <597a3374-311c-45e7-8c3b-8d9a18a20062@linaro.org>
Date: Sat, 28 Dec 2024 12:33:08 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Pengyu Luo <mitltlatltl@...il.com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
Sebastian Reichel <sre@...nel.org>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH 2/5] platform: arm64: add Huawei Matebook E Go (sc8280xp)
EC driver
On 27/12/2024 17:13, Pengyu Luo wrote:
> There are 3 variants, Huawei released first 2 at the same time.
There are three variants of which Huawei released the first two
simultaneously.
> Huawei Matebook E Go LTE(sc8180x), codename should be gaokun2.
> Huawei Matebook E Go(sc8280xp@...GHz), codename is gaokun3.
Choose either "codename should be" or "codename is"
> Huawei Matebook E Go 2023(sc8280xp@...9GHz).
Maybe say here "codename unknown"
> 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:
"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 the driver for the EC, that creates devices for UCSI, wmi and power
> supply devices.
I'm a terrible man for the "," dropped all about the place but you're
going too mad with the commans there ->
"Add a driver for the EC which creates devices for UCSI, WMI and power
supply devices"
>
> Signed-off-by: Pengyu Luo <mitltlatltl@...il.com>
> ---
> 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"
Krzysztof already mentioned this but the "sc8280xp" is questionable, you
should probably drop mention of qcom and sc8280xp from your compat and
tristate here.
> + 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.
OTOH the help text is where you could mention the sc8280xp class of
laptops/tablets.
> +
> 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 <mitltlatltl@...il.com>
> + */
> +
> +#include <linux/auxiliary_bus.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/input.h>
> +#include <linux/notifier.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/version.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
Is this odd indentation ?
> +#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);
What is this sleep about and why are you doing it inside of a critical
section ?
> +
> + 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.
depend on this
> + *
> + * 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, };
Instead of constructing your packet inline like this, suggest a
dedicated function to construct a request packet.
For example 1 @ INPUT_SIZE_OFFSET => the size of data a dedicated
function will make the "stuffing" of the request frame more obvious to
readers and make the construction of packets less error prone.
> +
> + 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) {
if start >= 0
is redundant no ? start is a u8 it can _only_ be >= 0 ..
> + 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;
again a function to construct a packet gets you out of the business of
inlining and "just knowing" which offset is which within any give
function which indexes an array.
> + 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)
value < 0 can never be true
> + 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;
Repeat of the clause above which was checking u8 >= 0 for the same
values in the rest of the clause - including checking <= 100.
Certainly a candidate for functional decomposition, inline function or a
define.
> +
> + 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};
Reverse Christmas tree
u8 req[REQ_HDR_SIZE];
int ret;
u8 val;
Not required but nice to look at.
> +
> + 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;
Why not use a bool for on ?
> +
> + 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])
int gaokun_ec_wmi_get_temp(struct gaokun_ec *ec, s16 *temp, size_t
temp_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) {
while (i < temp_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);
What's the point of the casting here ?
memcpy(temp, resp, sizeof(s16));
temp++;
> + }
> +
> + 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);
> + };
Write three times with a 100 millisecond sleep ?
Deserves a comment at least.
> +
> + 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 <mitltlatltl@...il.com>");
> +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 <mitltlatltl@...il.com>
> + */
> +
> +#include <linux/auxiliary_bus.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/sysfs.h>
> +#include <linux/version.h>
> +
> +#include <linux/platform_data/huawei-gaokun-ec.h>
> +
> +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;
ick ouch.
Please call these two functions and evaluate their result codes
individually.
> +
> + 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);
I mentioned already you should pass on as a bool and then decide here in
the input function if "on" as passed is a reasonable boolean state.
> + 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, "-");
Have you ever seen a negative temperature value in running silicon ?
Looks suspicious to me.
> + 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@...c0000.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 <mitltlatltl@...il.com>
> + *
> + */
> +
> +#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__ */
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