linux-kernel - [PATCH 1/1] platform/x86: asus-wmi: Add mic-mute LED classdev support

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Date:   Fri,  8 Jul 2022 17:07:31 +0800
From:   PaddyKP_Yao <ispaddy@...il.com>
To:     hdegoede@...hat.com, mgross@...ux.intel.com,
        corentin.chary@...il.com
Cc:     luke@...nes.dev, PaddyKP_Yao@...s.com,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        acpi4asus-user@...ts.sourceforge.net
Subject: [PATCH 1/1] platform/x86: asus-wmi: Add mic-mute LED classdev support

In some new ASUS devices, hotkey Fn+F13 is used for mic mute. If mic-mute
LED is present by checking WMI ASUS_WMI_DEVID_MICMUTE_LED, we will add a
mic-mute LED classdev, asus::micmute, in the asus-wmi driver to control
it. The binding of mic-mute LED controls will be swithched with LED
trigger.

Signed-off-by: PaddyKP_Yao <PaddyKP_Yao@...s.com>
---
 drivers/platform/x86/Kconfig               |  2 ++
 drivers/platform/x86/asus-wmi.c            | 25 ++++++++++++++++++++++
 include/linux/platform_data/x86/asus-wmi.h |  1 +
 3 files changed, 28 insertions(+)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index f915cf67aa26..74769050b770 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -274,6 +274,8 @@ config ASUS_WMI
 	select INPUT_SPARSEKMAP
 	select LEDS_CLASS
 	select NEW_LEDS
+	select LEDS_TRIGGERS
+	select LEDS_TRIGGER_AUDIO
 	select ACPI_PLATFORM_PROFILE
 	help
 	  Say Y here if you have a WMI aware Asus laptop (like Eee PCs or new
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index e14fb5fa7324..40c0e00a4b71 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -191,6 +191,7 @@ struct asus_wmi {
 	int kbd_led_wk;
 	struct led_classdev lightbar_led;
 	int lightbar_led_wk;
+	struct led_classdev micmute_led;
 	struct workqueue_struct *led_workqueue;
 	struct work_struct tpd_led_work;
 	struct work_struct wlan_led_work;
@@ -906,12 +907,23 @@ static enum led_brightness lightbar_led_get(struct led_classdev *led_cdev)
 	return result & ASUS_WMI_DSTS_LIGHTBAR_MASK;
 }
 
+static int micmute_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_MICMUTE_LED, state, NULL);
+	return err < 0 ? err : 0;
+}
+
 static void asus_wmi_led_exit(struct asus_wmi *asus)
 {
 	led_classdev_unregister(&asus->kbd_led);
 	led_classdev_unregister(&asus->tpd_led);
 	led_classdev_unregister(&asus->wlan_led);
 	led_classdev_unregister(&asus->lightbar_led);
+	led_classdev_unregister(&asus->micmute_led);
 
 	if (asus->led_workqueue)
 		destroy_workqueue(asus->led_workqueue);
@@ -983,6 +995,19 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
 					   &asus->lightbar_led);
 	}
 
+	if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_MICMUTE_LED)) {
+		asus->micmute_led.name = "asus::micmute";
+		asus->micmute_led.max_brightness = 1;
+		asus->micmute_led.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
+		asus->micmute_led.brightness_set_blocking = micmute_led_set;
+		asus->micmute_led.default_trigger = "audio-micmute";
+
+		rv = led_classdev_register(&asus->platform_device->dev,
+						&asus->micmute_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 17dc5cb6f3f2..38ee75874d11 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -49,6 +49,7 @@
 #define ASUS_WMI_DEVID_LED4		0x00020014
 #define ASUS_WMI_DEVID_LED5		0x00020015
 #define ASUS_WMI_DEVID_LED6		0x00020016
+#define ASUS_WMI_DEVID_MICMUTE_LED		0x00040017
 
 /* Backlight and Brightness */
 #define ASUS_WMI_DEVID_ALS_ENABLE	0x00050001 /* Ambient Light Sensor */
-- 
2.34.1