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Wed, 26 Nov 2025 12:19:22 -0800 (PST) Message-ID: <1326eb84-e952-43f5-b505-99b9a784c593@gmail.com> Date: Wed, 26 Nov 2025 21:19:21 +0100 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 08/11] HID: asus: listen to the asus-wmi brightness device instead of creating one To: Antheas Kapenekakis , platform-driver-x86@vger.kernel.org, linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jiri Kosina , Benjamin Tissoires , Corentin Chary , "Luke D . Jones" , Hans de Goede , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= References: <20251122110032.4274-1-lkml@antheas.dev> <20251122110032.4274-9-lkml@antheas.dev> Content-Language: en-US, it-IT, en-US-large From: Denis Benato In-Reply-To: <20251122110032.4274-9-lkml@antheas.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/22/25 12:00, Antheas Kapenekakis wrote: > Some ROG laptops expose multiple interfaces for controlling the > keyboard/RGB brightness. This creates a name conflict under > asus::kbd_brightness, where the second device ends up being > named asus::kbd_brightness_1 and they are both broken. > > Therefore, register a listener to the asus-wmi brightness device > instead of creating a new one. Reviewed-by: Denis Benato > Reviewed-by: Luke D. Jones > Signed-off-by: Antheas Kapenekakis > --- > drivers/hid/hid-asus.c | 65 +++++++----------------------------------- > 1 file changed, 10 insertions(+), 55 deletions(-) > > diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c > index 461b0f8efdfb..475e34187326 100644 > --- a/drivers/hid/hid-asus.c > +++ b/drivers/hid/hid-asus.c > @@ -27,7 +27,6 @@ > #include > #include > #include > -#include > #include > #include /* For to_usb_interface for T100 touchpad intf check */ > #include > @@ -103,7 +102,7 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad"); > #define TRKID_SGN ((TRKID_MAX + 1) >> 1) > > struct asus_kbd_leds { > - struct led_classdev cdev; > + struct asus_hid_listener listener; > struct hid_device *hdev; > struct work_struct work; > unsigned int brightness; > @@ -493,11 +492,11 @@ static void asus_schedule_work(struct asus_kbd_leds *led) > spin_unlock_irqrestore(&led->lock, flags); > } > > -static void asus_kbd_backlight_set(struct led_classdev *led_cdev, > - enum led_brightness brightness) > +static void asus_kbd_backlight_set(struct asus_hid_listener *listener, > + int brightness) > { > - struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds, > - cdev); > + struct asus_kbd_leds *led = container_of(listener, struct asus_kbd_leds, > + listener); > unsigned long flags; > > spin_lock_irqsave(&led->lock, flags); > @@ -507,20 +506,6 @@ static void asus_kbd_backlight_set(struct led_classdev *led_cdev, > asus_schedule_work(led); > } > > -static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev) > -{ > - struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds, > - cdev); > - enum led_brightness brightness; > - unsigned long flags; > - > - spin_lock_irqsave(&led->lock, flags); > - brightness = led->brightness; > - spin_unlock_irqrestore(&led->lock, flags); > - > - return brightness; > -} > - > static void asus_kbd_backlight_work(struct work_struct *work) > { > struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work); > @@ -537,34 +522,6 @@ static void asus_kbd_backlight_work(struct work_struct *work) > hid_err(led->hdev, "Asus failed to set keyboard backlight: %d\n", ret); > } > > -/* WMI-based keyboard backlight LED control (via asus-wmi driver) takes > - * precedence. We only activate HID-based backlight control when the > - * WMI control is not available. > - */ > -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); > - if (ret) > - return false; > - > - return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT); > -} > - > /* > * We don't care about any other part of the string except the version section. > * Example strings: FGA80100.RC72LA.312_T01, FGA80100.RC71LS.318_T01 > @@ -709,14 +666,11 @@ static int asus_kbd_register_leds(struct hid_device *hdev) > drvdata->kbd_backlight->removed = false; > drvdata->kbd_backlight->brightness = 0; > drvdata->kbd_backlight->hdev = hdev; > - drvdata->kbd_backlight->cdev.name = "asus::kbd_backlight"; > - drvdata->kbd_backlight->cdev.max_brightness = 3; > - drvdata->kbd_backlight->cdev.brightness_set = asus_kbd_backlight_set; > - drvdata->kbd_backlight->cdev.brightness_get = asus_kbd_backlight_get; > + drvdata->kbd_backlight->listener.brightness_set = asus_kbd_backlight_set; > INIT_WORK(&drvdata->kbd_backlight->work, asus_kbd_backlight_work); > spin_lock_init(&drvdata->kbd_backlight->lock); > > - ret = devm_led_classdev_register(&hdev->dev, &drvdata->kbd_backlight->cdev); > + ret = asus_hid_register_listener(&drvdata->kbd_backlight->listener); > if (ret < 0) { > /* No need to have this still around */ > devm_kfree(&hdev->dev, drvdata->kbd_backlight); > @@ -1105,7 +1059,7 @@ static int __maybe_unused asus_resume(struct hid_device *hdev) { > > if (drvdata->kbd_backlight) { > const u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, > - drvdata->kbd_backlight->cdev.brightness }; > + drvdata->kbd_backlight->brightness }; > ret = asus_kbd_set_report(hdev, buf, sizeof(buf)); > if (ret < 0) { > hid_err(hdev, "Asus failed to set keyboard backlight: %d\n", ret); > @@ -1231,7 +1185,6 @@ static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id) > } > > if (is_vendor && (drvdata->quirks & QUIRK_USE_KBD_BACKLIGHT) && > - !asus_kbd_wmi_led_control_present(hdev) && > asus_kbd_register_leds(hdev)) > hid_warn(hdev, "Failed to initialize backlight.\n"); > > @@ -1278,6 +1231,8 @@ static void asus_remove(struct hid_device *hdev) > unsigned long flags; > > if (drvdata->kbd_backlight) { > + asus_hid_unregister_listener(&drvdata->kbd_backlight->listener); > + > spin_lock_irqsave(&drvdata->kbd_backlight->lock, flags); > drvdata->kbd_backlight->removed = true; > spin_unlock_irqrestore(&drvdata->kbd_backlight->lock, flags);