[PATCH] HID: lenovo: suppress phantom radio control input on Yoga Slim 7x Gen 11

[Oleg Keri <okerixx@gmail.com>]

The ITE keyboard controller (048d:83db) declares a Wireless Radio Controls
application collection, which hid-input registers as a second input device
advertising KEY_RFKILL. That collection never reports anything: the
airplane mode key is wired to the embedded controller and reaches the host
as EC event 0x19, where the platform driver emits the key.

Map the collection to nothing so hidinput_has_been_populated() discards it
and userspace is left with a single, real KEY_RFKILL source.

Signed-off-by: Oleg Keri <okerixx@gmail.com>
---
 drivers/hid/hid-lenovo.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 3976d7b53b14..617bba662659 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -476,6 +476,16 @@ static int lenovo_input_mapping_x1_tab_kbd(struct hid_device *hdev,
 	return 0;
 }
 
+static int lenovo_input_mapping_yoga7x_g11_kbd(struct hid_device *hdev,
+		struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	if (field->application == HID_GD_WIRELESS_RADIO_CTLS)
+		return -1;
+
+	return 0;
+}
+
 static int lenovo_input_mapping(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit, int *max)
@@ -510,6 +520,8 @@ static int lenovo_input_mapping(struct hid_device *hdev,
 	case USB_DEVICE_ID_LENOVO_X1_TAB2:
 	case USB_DEVICE_ID_LENOVO_X1_TAB3:
 		return lenovo_input_mapping_x1_tab_kbd(hdev, hi, field, usage, bit, max);
+	case I2C_DEVICE_ID_ITE_LENOVO_YOGA_SLIM_7X_G11_KEYBOARD:
+		return lenovo_input_mapping_yoga7x_g11_kbd(hdev, hi, field, usage, bit, max);
 	default:
 		return 0;
 	}
@@ -1568,6 +1580,8 @@ static const struct hid_device_id lenovo_devices[] = {
 		     USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_X13_TAB) },
 	{ HID_DEVICE(BUS_I2C, HID_GROUP_GENERIC,
 		     USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_YOGA_SLIM_7X_KEYBOARD) },
+	{ HID_DEVICE(BUS_I2C, HID_GROUP_GENERIC,
+		     USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_YOGA_SLIM_7X_G11_KEYBOARD) },
 	{ }
 };
 
-- 
2.55.0

base-commit: 5e036ce12de91c6fd674dad33b169c6150be2a7a