linux-kernel - Re: [PATCH v2 1/1] hid-asus: use hid for brightness control on keyboard

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Message-Id: <dd0a211a-bef1-4eb2-8d1f-2d63799af94c@app.fastmail.com>
Date: Sat, 08 Jun 2024 11:24:14 +1200
From: "Luke Jones" <luke@...nes.dev>
To: "Jiri Kosina" <jikos@...nel.org>
Cc: "Benjamin Tissoires" <bentiss@...nel.org>, linux-input@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] hid-asus: use hid for brightness control on keyboard

I thought this was finalised but I'm still getting conflicting reports.
Please don't merge until I confirm the fix.

On Fri, 7 Jun 2024, at 4:05 PM, Luke D. Jones wrote:
> On almost all ASUS ROG series laptops the MCU used for the USB keyboard
> also has a HID packet used for setting the brightness. This is usually
> the same as the WMI method. But in some laptops the WMI method either
> is missing or doesn't work, so we should default to the HID control.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
> drivers/hid/hid-asus.c                     |  7 ++++
> drivers/platform/x86/asus-wmi.c            |  3 +-
> include/linux/platform_data/x86/asus-wmi.h | 45 ++++++++++++++++++++++
> 3 files changed, 54 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
> index 02de2bf4f790..0ed3708ef7e2 100644
> --- a/drivers/hid/hid-asus.c
> +++ b/drivers/hid/hid-asus.c
> @@ -492,12 +492,19 @@ static void asus_kbd_backlight_work(struct work_struct *work)
>   */
> static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
> {
> + struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
> u32 value;
> int ret;
>  
> if (!IS_ENABLED(CONFIG_ASUS_WMI))
> return false;
>  
> + if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD &&
> + dmi_check_system(asus_use_hid_led_dmi_ids)) {
> + hid_info(hdev, "using HID for asus::kbd_backlight\n");
> + return false;
> + }
> +
> ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS,
>        ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
> hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 3f9b6285c9a6..799d928c7d3d 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1681,7 +1681,8 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
> goto error;
> }
>  
> - if (!kbd_led_read(asus, &led_val, NULL)) {
> + if (!kbd_led_read(asus, &led_val, NULL) && !dmi_check_system(asus_use_hid_led_dmi_ids)) {
> + pr_info("using asus-wmi for asus::kbd_backlight\n");
> asus->kbd_led_wk = led_val;
> asus->kbd_led.name = "asus::kbd_backlight";
> asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 3eb5cd6773ad..6ba0015e4386 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -4,6 +4,7 @@
>  
> #include <linux/errno.h>
> #include <linux/types.h>
> +#include <linux/dmi.h>
>  
> /* WMI Methods */
> #define ASUS_WMI_METHODID_SPEC         0x43455053 /* BIOS SPECification */
> @@ -160,4 +161,48 @@ static inline int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
> }
> #endif
>  
> +/* To be used by both hid-asus and asus-wmi to determine which controls kbd_brightness */
> +#if IS_ENABLED(CONFIG_ASUS_WMI)
> +bool asus_use_hid_led(void);
> +#else
> +static inline bool asus_use_hid_led(void)
> +{
> + return true;
> +}
> +#endif
> +
> +static const struct dmi_system_id asus_use_hid_led_dmi_ids[] = {
> + {
> + .matches = {
> + DMI_MATCH(DMI_PRODUCT_FAMILY, "ROG Zephyrus"),
> + },
> + },
> + {
> + .matches = {
> + DMI_MATCH(DMI_PRODUCT_FAMILY, "ROG Strix"),
> + },
> + },
> + {
> + .matches = {
> + DMI_MATCH(DMI_PRODUCT_FAMILY, "ROG Flow"),
> + },
> + },
> + {
> + .matches = {
> + DMI_MATCH(DMI_BOARD_NAME, "GA403"),
> + },
> + },
> + {
> + .matches = {
> + DMI_MATCH(DMI_BOARD_NAME, "GU605"),
> + },
> + },
> + {
> + .matches = {
> + DMI_MATCH(DMI_BOARD_NAME, "RC71L"),
> + },
> + },
> + NULL,
> +};
> +
> #endif /* __PLATFORM_DATA_X86_ASUS_WMI_H */
> -- 
> 2.45.1
> 
>