Message-Id: <19MEZQ.UTU6ZTMH35X42@ljones.dev>
Date:   Tue, 14 Sep 2021 15:12:37 +1200
From:   Luke Jones <luke@...nes.dev>
To:     linux-kernel@...r.kernel.org
Cc:     hdegoede@...hat.com, pobrn@...tonmail.com, linux@...ck-us.net,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v13 1/1] asus-wmi: Add support for custom fan curves

Hi all,

I'm painfully aware of how many versions this has gone through now. I 
have found two small issues to fix unfortunately, after I was certain I 
had tested everything and dotted the tees. But after implementing the 
userspace API in asusctl I found the following.

- V14
  - Fix incorrect logic in fan_curve_get_factory_default()
  - Ensure fan_curve_enable_show() displays correct status for state

I won't submit V14 just yet. I'm going to have some of the community 
test the API in this and asusctl to ensure all is caught this time.

However I was very much hoping to get this in to 5.15 kernel, it feels 
like that window is closing?

Many thanks to y'all continued patience.
Luke.


On Sun, Sep 12 2021 at 18:35:59 +1200, Luke D. Jones <luke@...nes.dev> 
wrote:
> Add support for custom fan curves found on some ASUS ROG laptops.
> 
> These laptops have the ability to set a custom curve for the CPU
> and GPU fans via two ACPI methods.
> 
> This patch adds two pwm<N> attributes to the hwmon sysfs,
> pwm1 for CPU fan, pwm2 for GPU fan. Both are under the hwmon of the
> name `asus_custom_fan_curve`. There is no safety check of the set
> fan curves - this must be done in userspace.
> 
> The fans have settings [1,2,3] under pwm<N>_enable:
> 1. Enable and write settings out
> 2. Disable and use factory fan mode
> 3. Same as 2, additionally restoring default factory curve.
> 
> Use of 2 means that the curve the user has set is still stored and
> won't be erased, but the laptop will be using its default auto-fan
> mode. Re-enabling the manual mode then activates the curves again.
> 
> Notes:
> - pwm<N>_enable = 0 is an invalid setting.
> - pwm is actually a percentage and is scaled on writing to device.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  drivers/platform/x86/asus-wmi.c            | 607 
> ++++++++++++++++++++-
>  include/linux/platform_data/x86/asus-wmi.h |   2 +
>  2 files changed, 601 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/asus-wmi.c 
> b/drivers/platform/x86/asus-wmi.c
> index e14fb5fa7324..097e41a48947 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -106,8 +106,17 @@ module_param(fnlock_default, bool, 0444);
> 
>  #define WMI_EVENT_MASK			0xFFFF
> 
> +#define FAN_CURVE_POINTS		8
> +#define FAN_CURVE_BUF_LEN		(FAN_CURVE_POINTS * 2)
> +#define FAN_CURVE_DEV_CPU		0x00
> +#define FAN_CURVE_DEV_GPU		0x01
> +/* Mask to determine if setting temperature or percentage */
> +#define FAN_CURVE_PWM_MASK		0x04
> +
>  static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL 
> };
> 
> +static int throttle_thermal_policy_write(struct asus_wmi *);
> +
>  static bool ashs_present(void)
>  {
>  	int i = 0;
> @@ -122,7 +131,8 @@ struct bios_args {
>  	u32 arg0;
>  	u32 arg1;
>  	u32 arg2; /* At least TUF Gaming series uses 3 dword input buffer. 
> */
> -	u32 arg4;
> +	u32 arg3;
> +	u32 arg4; /* Some ROG laptops require a full 5 input args */
>  	u32 arg5;
>  } __packed;
> 
> @@ -173,6 +183,19 @@ enum fan_type {
>  	FAN_TYPE_SPEC83,	/* starting in Spec 8.3, use CPU_FAN_CTRL */
>  };
> 
> +/*
> + * The related ACPI method for testing availability also returns the 
> factory
> + * default fan curves. We save them here so that a user can reset 
> custom
> + * settings if required.
> + */
> +struct fan_curve_data {
> +	bool enabled;
> +	u8 temps[FAN_CURVE_POINTS];
> +	u8 percents[FAN_CURVE_POINTS];
> +	u8 default_temps[FAN_CURVE_POINTS];
> +	u8 default_percents[FAN_CURVE_POINTS];
> +};
> +
>  struct asus_wmi {
>  	int dsts_id;
>  	int spec;
> @@ -220,6 +243,10 @@ struct asus_wmi {
>  	bool throttle_thermal_policy_available;
>  	u8 throttle_thermal_policy_mode;
> 
> +	bool cpu_fan_curve_available;
> +	bool gpu_fan_curve_available;
> +	struct fan_curve_data custom_fan_curves[2];
> +
>  	struct platform_profile_handler platform_profile_handler;
>  	bool platform_profile_support;
> 
> @@ -285,6 +312,103 @@ int asus_wmi_evaluate_method(u32 method_id, u32 
> arg0, u32 arg1, u32 *retval)
>  }
>  EXPORT_SYMBOL_GPL(asus_wmi_evaluate_method);
> 
> +static int asus_wmi_evaluate_method5(u32 method_id,
> +		u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4, u32 *retval)
> +{
> +	struct bios_args args = {
> +		.arg0 = arg0,
> +		.arg1 = arg1,
> +		.arg2 = arg2,
> +		.arg3 = arg3,
> +		.arg4 = arg4,
> +	};
> +	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	acpi_status status;
> +	union acpi_object *obj;
> +	u32 tmp = 0;
> +
> +	status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 0, method_id,
> +				     &input, &output);
> +
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	obj = (union acpi_object *)output.pointer;
> +	if (obj && obj->type == ACPI_TYPE_INTEGER)
> +		tmp = (u32) obj->integer.value;
> +
> +	if (retval)
> +		*retval = tmp;
> +
> +	kfree(obj);
> +
> +	if (tmp == ASUS_WMI_UNSUPPORTED_METHOD)
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +/*
> + * Returns as an error if the method output is not a buffer. 
> Typically this
> + * means that the method called is unsupported.
> + */
> +static int asus_wmi_evaluate_method_buf(u32 method_id,
> +		u32 arg0, u32 arg1, u8 *ret_buffer, size_t size)
> +{
> +	struct bios_args args = {
> +		.arg0 = arg0,
> +		.arg1 = arg1,
> +		.arg2 = 0,
> +	};
> +	struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	acpi_status status;
> +	union acpi_object *obj;
> +	int err = 0;
> +
> +	status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 0, method_id,
> +				     &input, &output);
> +
> +	if (ACPI_FAILURE(status))
> +		return -EIO;
> +
> +	obj = (union acpi_object *)output.pointer;
> +
> +	switch (obj->type) {
> +	case ACPI_TYPE_BUFFER:
> +		if (obj->buffer.length > size)
> +			err = -ENOSPC;
> +		if (obj->buffer.length == 0)
> +			err = -ENODATA;
> +
> +		memcpy(ret_buffer, obj->buffer.pointer, obj->buffer.length);
> +		break;
> +	case ACPI_TYPE_INTEGER:
> +		err = (u32)obj->integer.value;
> +
> +		if (err == ASUS_WMI_UNSUPPORTED_METHOD)
> +			err = -ENODEV;
> +		/*
> +		 * At least one method returns a 0 with no buffer if no arg
> +		 * is provided, such as ASUS_WMI_DEVID_CPU_FAN_CURVE
> +		 */
> +		if (err == 0)
> +			err = -ENODATA;
> +		break;
> +	default:
> +		err = -ENODATA;
> +		break;
> +	}
> +
> +	kfree(obj);
> +
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}
> +
>  static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer 
> args)
>  {
>  	struct acpi_buffer input;
> @@ -1806,6 +1930,13 @@ static ssize_t pwm1_enable_store(struct device 
> *dev,
>  	}
> 
>  	asus->fan_pwm_mode = state;
> +
> +	/* Must set to disabled if mode is toggled */
> +	if (asus->cpu_fan_curve_available)
> +		asus->custom_fan_curves[FAN_CURVE_DEV_CPU].enabled = false;
> +	if (asus->gpu_fan_curve_available)
> +		asus->custom_fan_curves[FAN_CURVE_DEV_GPU].enabled = false;
> +
>  	return count;
>  }
> 
> @@ -1953,9 +2084,9 @@ static int fan_boost_mode_check_present(struct 
> asus_wmi *asus)
> 
>  static int fan_boost_mode_write(struct asus_wmi *asus)
>  {
> -	int err;
> -	u8 value;
>  	u32 retval;
> +	u8 value;
> +	int err;
> 
>  	value = asus->fan_boost_mode;
> 
> @@ -2013,10 +2144,10 @@ static ssize_t fan_boost_mode_store(struct 
> device *dev,
>  				    struct device_attribute *attr,
>  				    const char *buf, size_t count)
>  {
> -	int result;
> -	u8 new_mode;
>  	struct asus_wmi *asus = dev_get_drvdata(dev);
>  	u8 mask = asus->fan_boost_mode_mask;
> +	u8 new_mode;
> +	int result;
> 
>  	result = kstrtou8(buf, 10, &new_mode);
>  	if (result < 0) {
> @@ -2043,6 +2174,454 @@ static ssize_t fan_boost_mode_store(struct 
> device *dev,
>  // Fan boost mode: 0 - normal, 1 - overboost, 2 - silent
>  static DEVICE_ATTR_RW(fan_boost_mode);
> 
> +/* Custom fan curves per-profile 
> **********************************************/
> +
> +static void fan_curve_copy_from_buf(struct fan_curve_data *data, u8 
> *buf)
> +{
> +	int i;
> +
> +	for (i = 0; i < FAN_CURVE_POINTS; i++) {
> +		data->temps[i] = buf[i];
> +		data->default_temps[i] = buf[i];
> +	}
> +
> +	for (i = 0; i < FAN_CURVE_POINTS; i++) {
> +		data->percents[i] =
> +			255 * buf[i + FAN_CURVE_POINTS] / 100;
> +		data->default_percents[i] =
> +			255 * buf[i + FAN_CURVE_POINTS] / 100;
> +	}
> +}
> +
> +static int fan_curve_get_factory_default(struct asus_wmi *asus, u32 
> fan_dev)
> +{
> +	struct fan_curve_data *curves;
> +	u8 buf[FAN_CURVE_BUF_LEN];
> +	int fan_idx = 0;
> +	u8 mode = 0;
> +	int err;
> +
> +	if (asus->throttle_thermal_policy_available)
> +		mode = asus->throttle_thermal_policy_mode;
> +	/* DEVID_<C/G>PU_FAN_CURVE is switched for OVERBOOST vs SILENT */
> +	if (mode == 2)
> +		mode = 1;
> +	if (mode == 1)
> +		mode = 2;
> +
> +	if (fan_dev == ASUS_WMI_DEVID_GPU_FAN_CURVE)
> +		fan_idx = FAN_CURVE_DEV_GPU;
> +
> +	curves = &asus->custom_fan_curves[fan_idx];
> +	err = asus_wmi_evaluate_method_buf(asus->dsts_id, fan_dev, mode, 
> buf,
> +					   FAN_CURVE_BUF_LEN);
> +	if (err)
> +		return err;
> +
> +	fan_curve_copy_from_buf(curves, buf);
> +
> +	return 0;
> +}
> +
> +/*
> + * Check if capability exists, and populate defaults.
> + */
> +static int fan_curve_check_present(struct asus_wmi *asus, bool 
> *available,
> +				   u32 fan_dev)
> +{
> +	int err;
> +
> +	*available = false;
> +
> +	err = fan_curve_get_factory_default(asus, fan_dev);
> +	if (err) {
> +		if (err == -ENODEV)
> +			return 0;
> +		return err;
> +	}
> +
> +	*available = true;
> +	return 0;
> +}
> +
> +static struct fan_curve_data *fan_curve_data_select(struct asus_wmi 
> *asus,
> +					    struct device_attribute *attr)
> +{
> +	/* Determine which fan the attribute is for */
> +	int nr = to_sensor_dev_attr_2(attr)->nr;
> +	int fan = nr & FAN_CURVE_DEV_GPU;
> +
> +	return &asus->custom_fan_curves[fan];
> +}
> +
> +static ssize_t fan_curve_show(struct device *dev,
> +			      struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	/* Determine if temperature or pwm */
> +	int nr = to_sensor_dev_attr_2(attr)->nr;
> +	struct fan_curve_data *data;
> +	int value, index;
> +
> +	data = fan_curve_data_select(asus, attr);
> +	index = to_sensor_dev_attr_2(attr)->index;
> +
> +	if (nr & FAN_CURVE_PWM_MASK)
> +		value = data->percents[index];
> +	else
> +		value = data->temps[index];
> +
> +	return sysfs_emit(buf, "%d\n", value);
> +}
> +
> +/*
> + * "fan_dev" is the related WMI method such as 
> ASUS_WMI_DEVID_CPU_FAN_CURVE.
> + */
> +static int fan_curve_write(struct asus_wmi *asus,
> +			   struct device_attribute *attr, u32 fan_dev)
> +{
> +	struct fan_curve_data *data = fan_curve_data_select(asus, attr);
> +	u32 arg1 = 0, arg2 = 0, arg3 = 0, arg4 = 0;
> +	u8 *percents = data->percents;
> +	u8 *temps = data->temps;
> +	int ret, i, shift = 0;
> +
> +	for (i = 0; i < FAN_CURVE_POINTS / 2; i++) {
> +		arg1 += (temps[i]) << shift;
> +		arg2 += (temps[i + 4]) << shift;
> +		/* Scale to percentage for device */
> +		arg3 += (100 * percents[i] / 255) << shift;
> +		arg4 += (100 * percents[i + 4] / 255) << shift;
> +		shift += 8;
> +	}
> +
> +	return asus_wmi_evaluate_method5(ASUS_WMI_METHODID_DEVS, fan_dev, 
> arg1,
> +					 arg2, arg3, arg4, &ret);
> +}
> +
> +/*
> + * Called on curve enable/disable. This should be the only way to 
> write out the
> + * fan curves. This avoids potential lockups on write to ACPI for 
> every change.
> + */
> +static int fan_curve_write_data(struct asus_wmi *asus,
> +				struct device_attribute *attr)
> +{
> +	int err;
> +
> +	if (asus->cpu_fan_curve_available) {
> +		err = fan_curve_write(asus, attr, ASUS_WMI_DEVID_CPU_FAN_CURVE);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (asus->gpu_fan_curve_available) {
> +		err = fan_curve_write(asus, attr, ASUS_WMI_DEVID_GPU_FAN_CURVE);
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static ssize_t fan_curve_store(struct device *dev,
> +			       struct device_attribute *attr, const char *buf,
> +			       size_t count)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	struct fan_curve_data *data;
> +	u8 value;
> +	int err;
> +
> +	int index = to_sensor_dev_attr_2(attr)->index;
> +	int nr = to_sensor_dev_attr_2(attr)->nr;
> +	int pwm = nr & FAN_CURVE_PWM_MASK;
> +
> +	data = fan_curve_data_select(asus, attr);
> +
> +	err = kstrtou8(buf, 10, &value);
> +	if (err < 0)
> +		return err;
> +
> +	if (pwm) {
> +		data->percents[index] = value;
> +	} else {
> +		data->temps[index] = value;
> +	}
> +
> +	/*
> +	 * Mark as disabled so the user has to explicitly enable to apply a
> +	 * changed fan curve. This prevents potential lockups from writing 
> out
> +	 * many changes as one-write-per-change.
> +	 */
> +	data->enabled = false;
> +
> +	return count;
> +}
> +
> +static ssize_t fan_curve_enable_show(struct device *dev,
> +				     struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	struct fan_curve_data *data = fan_curve_data_select(asus, attr);
> +
> +	return sysfs_emit(buf, "%d\n", data->enabled);
> +}
> +
> +static int fan_curve_set_default(struct asus_wmi *asus)
> +{
> +	int err;
> +
> +	err = fan_curve_get_factory_default(
> +		asus, ASUS_WMI_DEVID_CPU_FAN_CURVE);
> +	if (err)
> +		return err;
> +
> +	err = fan_curve_get_factory_default(
> +		asus, ASUS_WMI_DEVID_GPU_FAN_CURVE);
> +	if (err)
> +		return err;
> +	return 0;
> +}
> +
> +static ssize_t fan_curve_enable_store(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	struct fan_curve_data *data;
> +	int value;
> +	int err;
> +
> +	data = fan_curve_data_select(asus, attr);
> +
> +	err = kstrtoint(buf, 10, &value);
> +	if (err < 0)
> +		return err;
> +
> +	switch (value) {
> +	case 1:
> +		data->enabled = true;
> +		break;
> +	case 2:
> +		data->enabled = false;
> +		break;
> +	/*
> +	 * Auto + reset the fan curve data to defaults. Make it an explicit
> +	 * option so that users don't accidentally overwrite a set fan 
> curve.
> +	 */
> +	case 3:
> +		err = fan_curve_set_default(asus);
> +		if (err)
> +			return err;
> +		data->enabled = false;
> +		break;
> +	default:
> +		return -EINVAL;
> +	};
> +
> +	/*
> +	 * For machines with throttle this is the only way to reset fans to
> +	 * default mode of operation (does not erase curve data).
> +	 */
> +	if (asus->throttle_thermal_policy_available && !data->enabled) {
> +		err = throttle_thermal_policy_write(asus);
> +		if (err)
> +			return err;
> +	}
> +	/* Similar is true for laptops with this fan */
> +	if (asus->fan_type == FAN_TYPE_SPEC83) {
> +		err = asus_fan_set_auto(asus);
> +		if (err)
> +			return err;
> +	}
> +	/*
> +	 * Machines without either need to write their defaults back always.
> +	 * This is more of a safeguard against ASUS faulty ACPI tables.
> +	 */
> +	if (!asus->throttle_thermal_policy_available
> +	    && asus->fan_type != FAN_TYPE_SPEC83 && !data->enabled) {
> +		err = fan_curve_set_default(asus);
> +		if (err)
> +			return err;
> +		err = fan_curve_write_data(asus, attr);
> +		if (err)
> +			return err;
> +	}
> +
> +	if (data->enabled) {
> +		err = fan_curve_write_data(asus, attr);
> +		if (err)
> +			return err;
> +	}
> +
> +	return count;
> +}
> +
> +/* CPU */
> +static SENSOR_DEVICE_ATTR_RW(pwm1_enable, fan_curve_enable, 
> FAN_CURVE_DEV_CPU);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 0);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 1);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 2);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 3);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 4);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point6_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 5);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point7_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 6);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point8_temp, fan_curve,
> +			       FAN_CURVE_DEV_CPU, 7);
> +
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 0);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 1);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 2);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 3);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 4);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point6_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 5);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point7_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 6);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point8_pwm, fan_curve,
> +			       FAN_CURVE_DEV_CPU | FAN_CURVE_PWM_MASK, 7);
> +
> +/* GPU */
> +static SENSOR_DEVICE_ATTR_RW(pwm2_enable, fan_curve_enable, 
> FAN_CURVE_DEV_GPU);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 0);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 1);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 2);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 3);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 4);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point6_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 5);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point7_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 6);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point8_temp, fan_curve,
> +			       FAN_CURVE_DEV_GPU, 7);
> +
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 0);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 1);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 2);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 3);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 4);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point6_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 5);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point7_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 6);
> +static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point8_pwm, fan_curve,
> +			       FAN_CURVE_DEV_GPU | FAN_CURVE_PWM_MASK, 7);
> +
> +static struct attribute *asus_fan_curve_attr[] = {
> +	/* CPU */
> +	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point7_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point8_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point7_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm1_auto_point8_pwm.dev_attr.attr,
> +	/* GPU */
> +	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point6_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point7_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point8_temp.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point6_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point7_pwm.dev_attr.attr,
> +	&sensor_dev_attr_pwm2_auto_point8_pwm.dev_attr.attr,
> +	NULL
> +};
> +
> +static umode_t asus_fan_curve_is_visible(struct kobject *kobj,
> +					 struct attribute *attr, int idx)
> +{
> +	struct device *dev = container_of(kobj, struct device, kobj);
> +	struct asus_wmi *asus = dev_get_drvdata(dev->parent);
> +
> +	if (asus->cpu_fan_curve_available)
> +		return 0644;
> +
> +	if (asus->gpu_fan_curve_available)
> +		return 0644;
> +
> +	return 0;
> +}
> +
> +static const struct attribute_group asus_fan_curve_attr_group = {
> +	.is_visible = asus_fan_curve_is_visible,
> +	.attrs = asus_fan_curve_attr,
> +};
> +__ATTRIBUTE_GROUPS(asus_fan_curve_attr);
> +
> +/*
> + * Must be initialised after throttle_thermal_policy_check_present() 
> as
> + * we check the status of throttle_thermal_policy_available during 
> init.
> + */
> +static int asus_wmi_custom_fan_curve_init(struct asus_wmi *asus)
> +{
> +	struct device *dev = &asus->platform_device->dev;
> +	struct device *hwmon;
> +	int err;
> +
> +	err = fan_curve_check_present(asus, &asus->cpu_fan_curve_available,
> +				      ASUS_WMI_DEVID_CPU_FAN_CURVE);
> +	if (err)
> +		return err;
> +
> +	err = fan_curve_check_present(asus, &asus->gpu_fan_curve_available,
> +				      ASUS_WMI_DEVID_GPU_FAN_CURVE);
> +	if (err)
> +		return err;
> +
> +	hwmon = devm_hwmon_device_register_with_groups(
> +		dev, "asus_custom_fan_curve", asus, asus_fan_curve_attr_groups);
> +
> +	if (IS_ERR(hwmon)) {
> +		dev_err(dev,
> +			"Could not register asus_custom_fan_curve device\n");
> +		return PTR_ERR(hwmon);
> +	}
> +
> +	return 0;
> +}
> +
>  /* Throttle thermal policy 
> ****************************************************/
> 
>  static int throttle_thermal_policy_check_present(struct asus_wmi 
> *asus)
> @@ -2053,8 +2632,8 @@ static int 
> throttle_thermal_policy_check_present(struct asus_wmi *asus)
>  	asus->throttle_thermal_policy_available = false;
> 
>  	err = asus_wmi_get_devstate(asus,
> -				    ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
> -				    &result);
> +		ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
> +		&result);
>  	if (err) {
>  		if (err == -ENODEV)
>  			return 0;
> @@ -2092,6 +2671,12 @@ static int 
> throttle_thermal_policy_write(struct asus_wmi *asus)
>  		return -EIO;
>  	}
> 
> +	/* Must set to disabled if mode is toggled */
> +	if (asus->cpu_fan_curve_available)
> +		asus->custom_fan_curves[FAN_CURVE_DEV_CPU].enabled = false;
> +	if (asus->gpu_fan_curve_available)
> +		asus->custom_fan_curves[FAN_CURVE_DEV_GPU].enabled = false;
> +
>  	return 0;
>  }
> 
> @@ -2901,7 +3486,7 @@ static int show_call(struct seq_file *m, void 
> *data)
>  	if (ACPI_FAILURE(status))
>  		return -EIO;
> 
> -	obj = (union acpi_object *)output.pointer;
> +	obj = output.pointer;
>  	if (obj && obj->type == ACPI_TYPE_INTEGER)
>  		seq_printf(m, "%#x(%#x, %#x) = %#x\n", asus->debug.method_id,
>  			   asus->debug.dev_id, asus->debug.ctrl_param,
> @@ -3035,6 +3620,10 @@ static int asus_wmi_add(struct platform_device 
> *pdev)
>  	if (err)
>  		goto fail_hwmon;
> 
> +	err = asus_wmi_custom_fan_curve_init(asus);
> +	if (err)
> +		goto fail_custom_fan_curve;
> +
>  	err = asus_wmi_led_init(asus);
>  	if (err)
>  		goto fail_leds;
> @@ -3106,6 +3695,7 @@ static int asus_wmi_add(struct platform_device 
> *pdev)
>  	asus_wmi_sysfs_exit(asus->platform_device);
>  fail_sysfs:
>  fail_throttle_thermal_policy:
> +fail_custom_fan_curve:
>  fail_platform_profile_setup:
>  	if (asus->platform_profile_support)
>  		platform_profile_remove();
> @@ -3131,6 +3721,7 @@ static int asus_wmi_remove(struct 
> platform_device *device)
>  	asus_wmi_debugfs_exit(asus);
>  	asus_wmi_sysfs_exit(asus->platform_device);
>  	asus_fan_set_auto(asus);
> +	throttle_thermal_policy_set_default(asus);
>  	asus_wmi_battery_exit(asus);
> 
>  	if (asus->platform_profile_support)
> diff --git a/include/linux/platform_data/x86/asus-wmi.h 
> b/include/linux/platform_data/x86/asus-wmi.h
> index 17dc5cb6f3f2..a571b47ff362 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -77,6 +77,8 @@
>  #define ASUS_WMI_DEVID_THERMAL_CTRL	0x00110011
>  #define ASUS_WMI_DEVID_FAN_CTRL		0x00110012 /* deprecated */
>  #define ASUS_WMI_DEVID_CPU_FAN_CTRL	0x00110013
> +#define ASUS_WMI_DEVID_CPU_FAN_CURVE	0x00110024
> +#define ASUS_WMI_DEVID_GPU_FAN_CURVE	0x00110025
> 
>  /* Power */
>  #define ASUS_WMI_DEVID_PROCESSOR_STATE	0x00120012
> --
> 2.32.0
> 

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