platform/x86: asus-wmi: support setting mini-LED mode

Support changing the mini-LED mode on some of the newer ASUS laptops.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230630053552.976579-8-luke@ljones.dev
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Documentation/ABI/testing/sysfs-platform-asus-wmi

@@ -117,3 +117,12 @@ Description:
 		Show if the egpu (XG Mobile) is correctly connected:
 			* 0 - False,
 			* 1 - True
+
+What:		/sys/devices/platform/<platform>/mini_led_mode
+Date:		Jun 2023
+KernelVersion:	6.5
+Contact:	"Luke Jones" <luke@ljones.dev>
+Description:
+		Change the mini-LED mode:
+			* 0 - Single-zone,
+			* 1 - Multi-zone

drivers/platform/x86/asus-wmi.c

@@ -265,6 +265,7 @@ struct asus_wmi {
 	bool battery_rsoc_available;
 
 	bool panel_overdrive_available;
+	bool mini_led_mode_available;
 
 	struct hotplug_slot hotplug_slot;
 	struct mutex hotplug_lock;
@@ -1820,6 +1821,54 @@ static ssize_t panel_od_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(panel_od);
 
+/* Mini-LED mode **************************************************************/
+static ssize_t mini_led_mode_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct asus_wmi *asus = dev_get_drvdata(dev);
+	int result;
+
+	result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_MINI_LED_MODE);
+	if (result < 0)
+		return result;
+
+	return sysfs_emit(buf, "%d\n", result);
+}
+
+static ssize_t mini_led_mode_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	int result, err;
+	u32 mode;
+
+	struct asus_wmi *asus = dev_get_drvdata(dev);
+
+	result = kstrtou32(buf, 10, &mode);
+	if (result)
+		return result;
+
+	if (mode > 1)
+		return -EINVAL;
+
+	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_MINI_LED_MODE, mode, &result);
+
+	if (err) {
+		pr_warn("Failed to set mini-LED: %d\n", err);
+		return err;
+	}
+
+	if (result > 1) {
+		pr_warn("Failed to set mini-LED mode (result): 0x%x\n", result);
+		return -EIO;
+	}
+
+	sysfs_notify(&asus->platform_device->dev.kobj, NULL, "mini_led_mode");
+
+	return count;
+}
+static DEVICE_ATTR_RW(mini_led_mode);
+
 /* Quirks *********************************************************************/
 
 static void asus_wmi_set_xusb2pr(struct asus_wmi *asus)
@@ -3727,6 +3776,7 @@ static struct attribute *platform_attributes[] = {
 	&dev_attr_fan_boost_mode.attr,
 	&dev_attr_throttle_thermal_policy.attr,
 	&dev_attr_panel_od.attr,
+	&dev_attr_mini_led_mode.attr,
 	NULL
 };
 
@@ -3764,6 +3814,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
 		ok = asus->throttle_thermal_policy_available;
 	else if (attr == &dev_attr_panel_od.attr)
 		ok = asus->panel_overdrive_available;
+	else if (attr == &dev_attr_mini_led_mode.attr)
+		ok = asus->mini_led_mode_available;
 
 	if (devid != -1)
 		ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);
@@ -4026,6 +4078,7 @@ static int asus_wmi_add(struct platform_device *pdev)
 	asus->kbd_rgb_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_MODE);
 	asus->kbd_rgb_state_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE);
 	asus->panel_overdrive_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_PANEL_OD);
+	asus->mini_led_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_MINI_LED_MODE);
 
 	err = fan_boost_mode_check_present(asus);
 	if (err)

include/linux/platform_data/x86/asus-wmi.h

@@ -66,6 +66,7 @@
 #define ASUS_WMI_DEVID_CAMERA		0x00060013
 #define ASUS_WMI_DEVID_LID_FLIP		0x00060062
 #define ASUS_WMI_DEVID_LID_FLIP_ROG	0x00060077
+#define ASUS_WMI_DEVID_MINI_LED_MODE	0x0005001E
 
 /* Storage */
 #define ASUS_WMI_DEVID_CARDREADER	0x00080013