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.gere...@wacom.com>
Reviewed-by: Ping Cheng <ping.ch...@wacom.com>
Signed-off-by: Jiri Kosina <jkos...@suse.cz>
[jason.gere...@wacom.com: Imported into input-wacom repository (37d1601938)]
Signed-off-by: Jason Gerecke <jason.gere...@wacom.com>
[jason.gere...@wacom.com: Backported from input-wacom repository (2d1c7f1)]
Signed-off-by: Jason Gerecke <jason.gere...@wacom.com>
---
3.17/wacom_wac.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/3.17/wacom_wac.c b/3.17/wacom_wac.c
index 34c70a8..cc88450 100644
--- a/3.17/wacom_wac.c
+++ b/3.17/wacom_wac.c
@@ -1822,6 +1822,7 @@ 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;
@@ -2045,6 +2046,7 @@ 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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