platform/x86: asus-wmi: Add support for SW_TABLET_MODE on UX360

The UX360CA has a WMI device id 0x00060062, which reports whether the
lid is flipped in tablet mode (1) or in normal laptop mode (0).

Add a quirk (quirk_asus_use_lid_flip_devid) for devices on which this
WMI device should be used to figure out the SW_TABLET_MODE state, as
opposed to the quirk_asus_use_kbd_dock_devid.

Additionally, the device needs to be queried on resume and restore
because the firmware does not generate an event if the laptop is put to
sleep while in tablet mode, flipped to normal mode, and later awoken.

It is assumed other UX360* models have the same WMI device. As such, the
quirk is applied to devices with DMI_MATCH(DMI_PRODUCT_NAME, "UX360").
More devices with this feature need to be tested and added accordingly.

The reason for using an allowlist via the quirk mechanism is that the new
WMI device (0x00060062) is also present on some models which do not have
a 360 degree hinge (at least FX503VD and GL503VD from Hans' DSTS
collection) and therefore its presence cannot be relied on.

Signed-off-by: Samuel Čavoj <samuel@cavoj.net>
Cc: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20201020220944.1075530-1-samuel@cavoj.net
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 39e1a6396e08..fa884c418f4e 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -63,6 +63,7 @@ MODULE_LICENSE("GPL");
 #define NOTIFY_KBD_BRTTOGGLE		0xc7
 #define NOTIFY_KBD_FBM			0x99
 #define NOTIFY_KBD_TTP			0xae
+#define NOTIFY_LID_FLIP			0xfa
 
 #define ASUS_WMI_FNLOCK_BIOS_DISABLED	BIT(0)
 
@@ -375,6 +376,20 @@ static int asus_wmi_input_init(struct asus_wmi *asus)
 		}
 	}
 
+	if (asus->driver->quirks->use_lid_flip_devid) {
+		result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_LID_FLIP);
+		if (result < 0)
+			asus->driver->quirks->use_lid_flip_devid = 0;
+		if (result >= 0) {
+			input_set_capability(asus->inputdev, EV_SW, SW_TABLET_MODE);
+			input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
+		} else if (result == -ENODEV) {
+			pr_err("This device has lid_flip quirk but got ENODEV checking it. This is a bug.");
+		} else {
+			pr_err("Error checking for lid-flip: %d\n", result);
+		}
+	}
+
 	err = input_register_device(asus->inputdev);
 	if (err)
 		goto err_free_dev;
@@ -394,6 +409,18 @@ static void asus_wmi_input_exit(struct asus_wmi *asus)
 	asus->inputdev = NULL;
 }
 
+/* Tablet mode ****************************************************************/
+
+static void lid_flip_tablet_mode_get_state(struct asus_wmi *asus)
+{
+	int result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_LID_FLIP);
+
+	if (result >= 0) {
+		input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
+		input_sync(asus->inputdev);
+	}
+}
+
 /* Battery ********************************************************************/
 
 /* The battery maximum charging percentage */
@@ -2128,6 +2155,11 @@ static void asus_wmi_handle_event_code(int code, struct asus_wmi *asus)
 		return;
 	}
 
+	if (asus->driver->quirks->use_lid_flip_devid && code == NOTIFY_LID_FLIP) {
+		lid_flip_tablet_mode_get_state(asus);
+		return;
+	}
+
 	if (asus->fan_boost_mode_available && code == NOTIFY_KBD_FBM) {
 		fan_boost_mode_switch_next(asus);
 		return;
@@ -2719,6 +2751,10 @@ static int asus_hotk_resume(struct device *device)
 
 	if (asus_wmi_has_fnlock_key(asus))
 		asus_wmi_fnlock_update(asus);
+
+	if (asus->driver->quirks->use_lid_flip_devid)
+		lid_flip_tablet_mode_get_state(asus);
+
 	return 0;
 }
 
@@ -2757,6 +2793,10 @@ static int asus_hotk_restore(struct device *device)
 
 	if (asus_wmi_has_fnlock_key(asus))
 		asus_wmi_fnlock_update(asus);
+
+	if (asus->driver->quirks->use_lid_flip_devid)
+		lid_flip_tablet_mode_get_state(asus);
+
 	return 0;
 }