linux-kernel - Re: [PATCH v1 08/10] platform/x86: msi-wmi-platform: Drop excess fans in dual fan devices

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Message-Id: <D9TQ4OLSV5U7.1NJ2JIKUN6QR3@gmail.com>
Date: Sun, 11 May 2025 20:35:30 -0300
From: "Kurt Borja" <kuurtb@...il.com>
To: "Antheas Kapenekakis" <lkml@...heas.dev>,
 <platform-driver-x86@...r.kernel.org>
Cc: "Armin Wolf" <W_Armin@....de>, "Jonathan Corbet" <corbet@....net>, "Hans
 de Goede" <hdegoede@...hat.com>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>, "Jean Delvare" <jdelvare@...e.com>,
 "Guenter Roeck" <linux@...ck-us.net>, <linux-doc@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-hwmon@...r.kernel.org>
Subject: Re: [PATCH v1 08/10] platform/x86: msi-wmi-platform: Drop excess
 fans in dual fan devices

On Sun May 11, 2025 at 5:44 PM -03, Antheas Kapenekakis wrote:
> Currently, the platform driver always exposes 4 fans, since the
> underlying WMI interface reads 4 values from the EC. However, most
> devices only have two fans. Therefore, at least in the case of the
> Claw series, quirk the driver to only show two hwmon fans.
>
> Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
> ---
>  drivers/platform/x86/msi-wmi-platform.c | 28 ++++++++++++++++++++++---
>  1 file changed, 25 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/platform/x86/msi-wmi-platform.c b/drivers/platform/x86/msi-wmi-platform.c
> index 46928fb4da8a6..eaf0eb25e349b 100644
> --- a/drivers/platform/x86/msi-wmi-platform.c
> +++ b/drivers/platform/x86/msi-wmi-platform.c
> @@ -121,6 +121,7 @@ enum msi_wmi_platform_method {
>  struct msi_wmi_platform_quirk {
>  	bool shift_mode;	/* Shift mode is supported */
>  	bool charge_threshold;	/* Charge threshold is supported */
> +	bool dual_fans;		/* For devices with two hwmon fans */
>  	int pl_min;		/* Minimum PLx value */
>  	int pl1_max;		/* Maximum PL1 value */
>  	int pl2_max;		/* Maximum PL2 value */
> @@ -216,6 +217,7 @@ static struct msi_wmi_platform_quirk quirk_default = {};
>  static struct msi_wmi_platform_quirk quirk_gen1 = {
>  	.shift_mode = true,
>  	.charge_threshold = true,
> +	.dual_fans = true,
>  	.pl_min = 8,
>  	.pl1_max = 43,
>  	.pl2_max = 45
> @@ -223,6 +225,7 @@ static struct msi_wmi_platform_quirk quirk_gen1 = {
>  static struct msi_wmi_platform_quirk quirk_gen2 = {
>  	.shift_mode = true,
>  	.charge_threshold = true,
> +	.dual_fans = true,
>  	.pl_min = 8,
>  	.pl1_max = 30,
>  	.pl2_max = 37
> @@ -635,6 +638,23 @@ static const struct hwmon_chip_info msi_wmi_platform_chip_info = {
>  	.info = msi_wmi_platform_info,
>  };
>  
> +static const struct hwmon_channel_info * const msi_wmi_platform_info_dual[] = {
> +	HWMON_CHANNEL_INFO(fan,
> +			   HWMON_F_INPUT,
> +			   HWMON_F_INPUT
> +			   ),
> +	HWMON_CHANNEL_INFO(pwm,
> +			   HWMON_PWM_ENABLE,
> +			   HWMON_PWM_ENABLE
> +			   ),
> +	NULL
> +};
> +
> +static const struct hwmon_chip_info msi_wmi_platform_chip_info_dual = {
> +	.ops = &msi_wmi_platform_ops,
> +	.info = msi_wmi_platform_info_dual,
> +};
> +
>  static int msi_wmi_platform_profile_probe(void *drvdata, unsigned long *choices)
>  {
>  	set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
> @@ -1227,9 +1247,11 @@ static int msi_wmi_platform_hwmon_init(struct msi_wmi_platform_data *data)
>  {
>  	struct device *hdev;
>  
> -	hdev = devm_hwmon_device_register_with_info(&data->wdev->dev, "msi_wmi_platform", data,
> -						    &msi_wmi_platform_chip_info,
> -						    msi_wmi_platform_hwmon_groups);
> +	hdev = devm_hwmon_device_register_with_info(
> +		&data->wdev->dev, "msi_wmi_platform", data,
> +		data->quirks->dual_fans ? &msi_wmi_platform_chip_info_dual :
> +					&msi_wmi_platform_chip_info,

This is the wrong approach.

Add the quirk and control visibility from msi_wmi_platform_is_visible(),
like I mentioned in the cover-letter.

-- 
 ~ Kurt

> +		msi_wmi_platform_hwmon_groups);
>  
>  	return PTR_ERR_OR_ZERO(hdev);
>  }


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