linux-kernel - Re: [PATCH 1/9] platform/x86: asus-wmi: add support for 2024 ROG Mini-LED

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Date: Mon, 25 Mar 2024 15:47:46 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "Luke D. Jones" <luke@...nes.dev>
cc: Hans de Goede <hdegoede@...hat.com>, corentin.chary@...il.com, 
    platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9] platform/x86: asus-wmi: add support for 2024 ROG
 Mini-LED

On Mon, 25 Mar 2024, Luke D. Jones wrote:

> Support the 2024 mini-led backlight and adjust the related functions
> to select the relevant dev-id. Also add `available_mini_led_mode` to the
> platform sysfs since the available mini-led levels can be different.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  .../ABI/testing/sysfs-platform-asus-wmi       |  8 ++
>  drivers/platform/x86/asus-wmi.c               | 74 +++++++++++++++++--
>  include/linux/platform_data/x86/asus-wmi.h    |  1 +
>  3 files changed, 76 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
> index 8a7e25bde085..61a745d2476f 100644
> --- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
> +++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
> @@ -126,6 +126,14 @@ Description:
>  		Change the mini-LED mode:
>  			* 0 - Single-zone,
>  			* 1 - Multi-zone
> +			* 2 - Multi-zone strong (available on newer generation mini-led)
> +
> +What:		/sys/devices/platform/<platform>/available_mini_led_mode
> +Date:		Jun 2023
> +KernelVersion:	6.10
> +Contact:	"Luke Jones" <luke@...nes.dev>
> +Description:
> +		List the available mini-led modes.
>  
>  What:		/sys/devices/platform/<platform>/ppt_pl1_spl
>  Date:		Jun 2023
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 18be35fdb381..54ce0fb26f42 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -297,6 +297,7 @@ struct asus_wmi {
>  
>  	bool panel_overdrive_available;
>  	bool mini_led_mode_available;
> +	u32 mini_led_dev_id;
>  
>  	struct hotplug_slot hotplug_slot;
>  	struct mutex hotplug_lock;
> @@ -2109,10 +2110,27 @@ static ssize_t mini_led_mode_show(struct device *dev,
>  	struct asus_wmi *asus = dev_get_drvdata(dev);
>  	int result;
>  
> -	result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_MINI_LED_MODE);
> -	if (result < 0)
> -		return result;
> +	result = asus_wmi_get_devstate_simple(asus, asus->mini_led_dev_id);
>  
> +	/* Remap the mode values to match previous generation mini-led.
> +	 * Some BIOSes return -19 instead of 2, which is "mini-LED off", this
> +	 * appears to be a  BIOS bug.
> +	 */
> +	if (asus->mini_led_dev_id == ASUS_WMI_DEVID_MINI_LED_MODE2) {
> +		switch (result) {
> +		case 0:
> +			result = 1;
> +			break;
> +		case 1:
> +			result = 2;
> +			break;
> +		case 2:
> +		case -19:

Can you confirm this -19 really does come from BIOS? Because I suspect 
it's -ENODEV error code from from one of the functions on the driver side
(which is why I asked you to change it into -ENODEV).


-- 
 i.