HID: wacom: generic: Add support for battery status on pen and pad interfaces

Adds support for usages that may appear on the pen or pad interface which
report the state of the tablet battery.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 40 insertions, 1 deletions

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 70de1fa930cc..f3edecf52c06 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1525,6 +1525,10 @@ static void wacom_wac_pad_usage_mapping(struct hid_device *hdev,
 	unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
 
 	switch (equivalent_usage) {
+	case WACOM_HID_WD_BATTERY_LEVEL:
+	case WACOM_HID_WD_BATTERY_CHARGING:
+		features->quirks |= WACOM_QUIRK_BATTERY;
+		break;
 	case WACOM_HID_WD_ACCELEROMETER_X:
 		__set_bit(INPUT_PROP_ACCELEROMETER, input->propbit);
 		wacom_map_usage(input, usage, field, EV_ABS, ABS_X, 0);
@@ -1574,8 +1578,25 @@ static int wacom_wac_pad_event(struct hid_device *hdev, struct hid_field *field,
 		wacom_wac->hid_data.inrange_state |= value;
 	}
 
-	if (equivalent_usage != WACOM_HID_WD_TOUCHRINGSTATUS)
+	switch (equivalent_usage) {
+	case WACOM_HID_WD_BATTERY_LEVEL:
+		wacom_wac->hid_data.battery_capacity = value;
+		wacom_wac->hid_data.bat_connected = 1;
+		return 0;
+
+	case WACOM_HID_WD_BATTERY_CHARGING:
+		wacom_wac->hid_data.bat_charging = value;
+		wacom_wac->hid_data.ps_connected = value;
+		wacom_wac->hid_data.bat_connected = 1;
+		return 0;
+
+	case WACOM_HID_WD_TOUCHRINGSTATUS:
+		return 0;
+
+	default:
 		input_event(input, usage->type, usage->code, value);
+		break;
+	}
 
 	return 0;
 }
@@ -1594,6 +1615,7 @@ static void wacom_wac_pad_report(struct hid_device *hdev,
 {
 	struct wacom *wacom = hid_get_drvdata(hdev);
 	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+	struct wacom_features *features = &wacom_wac->features;
 	struct input_dev *input = wacom_wac->pad_input;
 	bool active = wacom_wac->hid_data.inrange_state != 0;
 
@@ -1604,6 +1626,16 @@ static void wacom_wac_pad_report(struct hid_device *hdev,
 	if (wacom_equivalent_usage(report->field[0]->physical) == HID_DG_TABLETFUNCTIONKEY)
 		input_event(input, EV_ABS, ABS_MISC, active ? PAD_DEVICE_ID : 0);
 
+	if (features->quirks & WACOM_QUIRK_BATTERY) {
+		int capacity = wacom_wac->hid_data.battery_capacity;
+		bool charging = wacom_wac->hid_data.bat_charging;
+		bool connected = wacom_wac->hid_data.bat_connected;
+		bool powered = wacom_wac->hid_data.ps_connected;
+
+		wacom_notify_battery(wacom_wac, capacity, charging,
+				     connected, powered);
+	}
+
 	input_sync(input);
 }
 
@@ -1633,6 +1665,9 @@ static void wacom_wac_pen_usage_mapping(struct hid_device *hdev,
 	case HID_DG_INRANGE:
 		wacom_map_usage(input, usage, field, EV_KEY, BTN_TOOL_PEN, 0);
 		break;
+	case HID_DG_BATTERYSTRENGTH:
+		features->quirks |= WACOM_QUIRK_BATTERY;
+		break;
 	case HID_DG_INVERT:
 		wacom_map_usage(input, usage, field, EV_KEY,
 				BTN_TOOL_RUBBER, 0);
@@ -1703,6 +1738,10 @@ static int wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field,
 		if (!(features->quirks & WACOM_QUIRK_SENSE))
 			wacom_wac->hid_data.sense_state = value;
 		return 0;
+	case HID_DG_BATTERYSTRENGTH:
+		wacom_wac->hid_data.battery_capacity = value;
+		wacom_wac->hid_data.bat_connected = 1;
+		break;
 	case HID_DG_INVERT:
 		wacom_wac->hid_data.invert_state = value;
 		return 0;