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HID: wacom: generic: Ignore HID_DG_BATTERYSTRENTH == 0

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AES sensors use the value 0 to indicate "not available" rather than
"completely dead". Such values are often sent for dozens of reports
while the pen is being brought into proximity and can cause userspace
to get the wrong impression about the actual battery state.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jason Gerecke 2017-04-28 09:25:31 -07:00 committed by Jiri Kosina
parent 37d1601938
commit f496c09c07
1 changed files with 2 additions and 0 deletions
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2
drivers/hid/wacom_wac.c
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@ -2036,6 +2036,8 @@ static void wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field
wacom_wac->hid_data.sense_state = value;
return;
case HID_DG_BATTERYSTRENGTH:
if (value == 0) /* "not available" */
break;
value = value * 100 / (field->logical_maximum - field->logical_minimum);
wacom_wac->hid_data.battery_capacity = value;
wacom_wac->hid_data.bat_connected = 1;