From 37d1601938349e79e9c31a8aba431d5543e09e72 Mon Sep 17 00:00:00 2001 From: Jason Gerecke Date: Fri, 28 Apr 2017 09:25:30 -0700 Subject: [PATCH] HID: wacom: generic: Scale battery capacity measurements to percentages The power_supply subsystem expects us to provide it with capacity values measured in percent. In particular, AES devices (HID_DG_BATTERYSTRENGTH) use the range 0-255, which needs to be rescaled. The MobileStudio Pro (WACOM_HID_WD_BATTERY_LEVEL) uses the range 0-100, but there's no guarantee that future devices will share the same range. Signed-off-by: Jason Gerecke Reviewed-by: Ping Cheng Signed-off-by: Jiri Kosina --- drivers/hid/wacom_wac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 4b225fb19a16..fd989e09ae2d 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1811,6 +1811,7 @@ static void wacom_wac_pad_battery_event(struct hid_device *hdev, struct hid_fiel switch (equivalent_usage) { case WACOM_HID_WD_BATTERY_LEVEL: + value = value * 100 / (field->logical_maximum - field->logical_minimum); wacom_wac->hid_data.battery_capacity = value; wacom_wac->hid_data.bat_connected = 1; break; @@ -2035,6 +2036,7 @@ 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: + value = value * 100 / (field->logical_maximum - field->logical_minimum); wacom_wac->hid_data.battery_capacity = value; wacom_wac->hid_data.bat_connected = 1; break; -- 2.20.1