linux-kernel - [PATCH 1/2] platform/x86: asus-wmi: support camera disable LED

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Message-ID: <20240620082223.20178-2-dev@doubly.so>
Date: Thu, 20 Jun 2024 08:22:22 +0000
From: Devin Bayer <dev@...bly.so>
To: corentin.chary@...il.com,
	luke@...nes.dev
Cc: hdegoede@...hat.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	ilpo.jarvinen@...ux.intel.com,
	Devin Bayer <dev@...bly.so>
Subject: [PATCH 1/2] platform/x86: asus-wmi: support camera disable LED

Support the LED on F10 above the crossed out camera icon.

Signed-off-by: Devin Bayer <dev@...bly.so>
---
 drivers/platform/x86/asus-wmi.c            | 36 ++++++++++++++++++++++
 include/linux/platform_data/x86/asus-wmi.h |  2 ++
 2 files changed, 38 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 3f9b6285c9a6..5585f15e7920 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -73,6 +73,7 @@ module_param(fnlock_default, bool, 0444);
 #define NOTIFY_LID_FLIP_ROG		0xbd
 
 #define ASUS_WMI_FNLOCK_BIOS_DISABLED	BIT(0)
+#define ASUS_WMI_DEVID_CAMERA_LED		0x00060079
 
 #define ASUS_MID_FAN_DESC		"mid_fan"
 #define ASUS_GPU_FAN_DESC		"gpu_fan"
@@ -238,6 +239,7 @@ struct asus_wmi {
 	struct led_classdev lightbar_led;
 	int lightbar_led_wk;
 	struct led_classdev micmute_led;
+	struct led_classdev camera_led;
 	struct workqueue_struct *led_workqueue;
 	struct work_struct tpd_led_work;
 	struct work_struct wlan_led_work;
@@ -1642,6 +1644,27 @@ static int micmute_led_set(struct led_classdev *led_cdev,
 	return err < 0 ? err : 0;
 }
 
+static enum led_brightness camera_led_get(struct led_classdev *led_cdev)
+{
+	struct asus_wmi *asus;
+	u32 result;
+
+	asus = container_of(led_cdev, struct asus_wmi, camera_led);
+	asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_CAMERA_LED, &result);
+
+	return result & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
+}
+
+static int camera_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness brightness)
+{
+	int state = brightness != LED_OFF;
+	int err;
+
+	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_CAMERA_LED, state, NULL);
+	return err < 0 ? err : 0;
+}
+
 static void asus_wmi_led_exit(struct asus_wmi *asus)
 {
 	led_classdev_unregister(&asus->kbd_led);
@@ -1649,6 +1672,7 @@ static void asus_wmi_led_exit(struct asus_wmi *asus)
 	led_classdev_unregister(&asus->wlan_led);
 	led_classdev_unregister(&asus->lightbar_led);
 	led_classdev_unregister(&asus->micmute_led);
+	led_classdev_unregister(&asus->camera_led);
 
 	if (asus->led_workqueue)
 		destroy_workqueue(asus->led_workqueue);
@@ -1740,6 +1764,18 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
 			goto error;
 	}
 
+	if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CAMERA_LED)) {
+		asus->camera_led.name = "platform::camera";
+		asus->camera_led.max_brightness = 1;
+		asus->camera_led.brightness_get = camera_led_get;
+		asus->camera_led.brightness_set_blocking = camera_led_set;
+
+		rv = led_classdev_register(&asus->platform_device->dev,
+						&asus->camera_led);
+		if (rv)
+			goto error;
+	}
+
 error:
 	if (rv)
 		asus_wmi_led_exit(asus);
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 3eb5cd6773ad..b3c35e33f1e7 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -50,6 +50,8 @@
 #define ASUS_WMI_DEVID_LED5		0x00020015
 #define ASUS_WMI_DEVID_LED6		0x00020016
 #define ASUS_WMI_DEVID_MICMUTE_LED		0x00040017
+#define ASUS_WMI_DEVID_CAMERA_LED_NEG		0x00060078
+#define ASUS_WMI_DEVID_CAMERA_LED		0x00060079
 
 /* Backlight and Brightness */
 #define ASUS_WMI_DEVID_ALS_ENABLE	0x00050001 /* Ambient Light Sensor */
-- 
2.45.2