[PATCH 6/9] platform/x86: asus-wmi: add panel-fhd functionality

["Luke D. Jones" <luke@ljones.dev>]

Exposes the FHD panel toggle avavilable on new ASUS Duo laptops.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
 .../ABI/testing/sysfs-platform-asus-wmi       |  9 +++++++++
 drivers/platform/x86/asus-wmi.c               | 20 +++++++++++++++++++
 include/linux/platform_data/x86/asus-wmi.h    |  1 +
 3 files changed, 30 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index 984a04f32fd0..3b4eeea75b7b 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -217,3 +217,12 @@ Description:
 		Set if the MCU can go in to low-power mode on system sleep
 			* 0 - False,
 			* 1 - True
+
+What:		/sys/devices/platform/<platform>/panel_fhd
+Date:		Apr 2024
+KernelVersion:	6.11
+Contact:	"Luke Jones" <luke@ljones.dev>
+Description:
+		Set panel to UHD or FHD mode
+			* 0 - UHD,
+			* 1 - FHD
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 260548aa6a42..4b045f1828f1 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -798,6 +798,23 @@ WMI_ATTR_SIMPLE_RW(panel_od, 0, 1, ASUS_WMI_DEVID_PANEL_OD);
 WMI_ATTR_SIMPLE_RW(boot_sound, 0, 1, ASUS_WMI_DEVID_BOOT_SOUND);
 WMI_ATTR_SIMPLE_RO(charge_mode, ASUS_WMI_DEVID_CHARGE_MODE);
 
+static ssize_t panel_fhd_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct asus_wmi *asus = dev_get_drvdata(dev);
+	int err;
+
+	err = rog_tunable_store(asus, &attr->attr, buf, count,
+				0, 1, -1, NULL, ASUS_WMI_DEVID_PANEL_FHD);
+	if (err < 0)
+		return err;
+
+	pr_info("Panel UHD/FHD display mode changed, reboot required\n");
+	return count;
+}
+WMI_SIMPLE_SHOW(panel_fhd, "%d\n", ASUS_WMI_DEVID_PANEL_FHD);
+static DEVICE_ATTR_RW(panel_fhd);
+
 /* Tablet mode ****************************************************************/
 
 static void asus_wmi_tablet_mode_get_state(struct asus_wmi *asus)
@@ -4040,6 +4057,7 @@ static struct attribute *platform_attributes[] = {
 	&dev_attr_mcu_powersave.attr,
 	&dev_attr_boot_sound.attr,
 	&dev_attr_panel_od.attr,
+	&dev_attr_panel_fhd.attr,
 	&dev_attr_mini_led_mode.attr,
 	&dev_attr_available_mini_led_mode.attr,
 	NULL
@@ -4111,6 +4129,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
 		devid = ASUS_WMI_DEVID_BOOT_SOUND;
 	else if (attr == &dev_attr_panel_od.attr)
 		devid = ASUS_WMI_DEVID_PANEL_OD;
+	else if (attr == &dev_attr_panel_fhd.attr)
+		devid = ASUS_WMI_DEVID_PANEL_FHD;
 	else if (attr == &dev_attr_mini_led_mode.attr)
 		ok = asus->mini_led_dev_id != 0;
 	else if (attr == &dev_attr_available_mini_led_mode.attr)
diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 79a50102440d..6c51d41ffc20 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -72,6 +72,7 @@
 #define ASUS_WMI_DEVID_LID_FLIP_ROG	0x00060077
 #define ASUS_WMI_DEVID_MINI_LED_MODE	0x0005001E
 #define ASUS_WMI_DEVID_MINI_LED_MODE2	0x0005002E
+#define ASUS_WMI_DEVID_PANEL_FHD	0x0005001C
 
 /* Storage */
 #define ASUS_WMI_DEVID_CARDREADER	0x00080013
-- 
2.45.1