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 <jason.gerecke@xxxxxxxxx>
---
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 6b8f6b816195..1878da3321f8 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;
@@ -2033,6 +2034,7 @@ 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;
--
2.12.2
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