linux-kernel - Re: [PATCH] asus-wmi: Expand support of GPU fan to read RPM and label

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Date:   Mon, 19 Sep 2022 13:18:37 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Luke D. Jones" <luke@...nes.dev>
Cc:     markgross@...nel.org, corentin.chary@...il.com, linux@...ck-us.net,
        jdelvare@...e.com, acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH] asus-wmi: Expand support of GPU fan to read RPM and label

Hi Luke,

On 9/16/22 01:46, Luke D. Jones wrote:
> The previously added patch to add support for pwm change for TUF laptops
> also is usuable for more than TUF. The same method `0x00110014` is
> used to read the fan RPM.
> 
> Add two extra attributes for reading fan2 plus fan2 label.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  drivers/platform/x86/asus-wmi.c | 36 +++++++++++++++++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index ae46af731de9..7fe6ce25da0a 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -72,6 +72,7 @@ module_param(fnlock_default, bool, 0444);
>  
>  #define ASUS_WMI_FNLOCK_BIOS_DISABLED	BIT(0)
>  
> +#define ASUS_GPU_FAN_DESC		"gpu_fan"
>  #define ASUS_FAN_DESC			"cpu_fan"
>  #define ASUS_FAN_MFUN			0x13
>  #define ASUS_FAN_SFUN_READ		0x06
> @@ -2078,6 +2079,30 @@ static ssize_t asus_hwmon_temp1(struct device *dev,
>  }
>  
>  /* GPU fan on modern ROG laptops */
> +static ssize_t fan2_input_show(struct device *dev,
> +					struct device_attribute *attr,
> +					char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	int value;
> +	int ret;
> +
> +	ret = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_GPU_FAN_CTRL, &value);
> +	if (ret < 0)
> +		return ret;
> +
> +	value &= 0xffff;
> +
> +	return sysfs_emit(buf, "%d\n", value < 0 ? -1 : value * 100);

As already mentioned since you & with 0xffff above the sign bit can never be
set, so the value is never less then < 0, so I have simplified this to:

	return sysfs_emit(buf, "%d\n", value * 100);

while merging.

> +}
> +
> +static ssize_t fan2_label_show(struct device *dev,
> +					  struct device_attribute *attr,
> +					  char *buf)
> +{
> +	return sprintf(buf, "%s\n", ASUS_GPU_FAN_DESC);
> +}

And here I have done s/sprintf/sysfs_emit/ with those changes
I've applied this patch to my review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> +
>  static ssize_t pwm2_enable_show(struct device *dev,
>  				struct device_attribute *attr,
>  				char *buf)
> @@ -2127,9 +2152,12 @@ static ssize_t pwm2_enable_store(struct device *dev,
>  /* Fan1 */
>  static DEVICE_ATTR_RW(pwm1);
>  static DEVICE_ATTR_RW(pwm1_enable);
> -static DEVICE_ATTR_RW(pwm2_enable);
>  static DEVICE_ATTR_RO(fan1_input);
>  static DEVICE_ATTR_RO(fan1_label);
> +/* Fan2 - GPU fan */
> +static DEVICE_ATTR_RW(pwm2_enable);
> +static DEVICE_ATTR_RO(fan2_input);
> +static DEVICE_ATTR_RO(fan2_label);
>  
>  /* Temperature */
>  static DEVICE_ATTR(temp1_input, S_IRUGO, asus_hwmon_temp1, NULL);
> @@ -2140,6 +2168,8 @@ static struct attribute *hwmon_attributes[] = {
>  	&dev_attr_pwm2_enable.attr,
>  	&dev_attr_fan1_input.attr,
>  	&dev_attr_fan1_label.attr,
> +	&dev_attr_fan2_input.attr,
> +	&dev_attr_fan2_label.attr,
>  
>  	&dev_attr_temp1_input.attr,
>  	NULL
> @@ -2160,7 +2190,9 @@ static umode_t asus_hwmon_sysfs_is_visible(struct kobject *kobj,
>  	    || attr == &dev_attr_pwm1_enable.attr) {
>  		if (asus->fan_type == FAN_TYPE_NONE)
>  			return 0;
> -	} else if (attr == &dev_attr_pwm2_enable.attr) {
> +	} else if (attr == &dev_attr_fan2_input.attr
> +	    || attr == &dev_attr_fan2_label.attr
> +	    || attr == &dev_attr_pwm2_enable.attr) {
>  		if (asus->gpu_fan_type == FAN_TYPE_NONE)
>  			return 0;
>  	} else if (attr == &dev_attr_temp1_input.attr) {