HID: hid-input: only ignore 0 battery events for digitizers

[ Upstream commit 0187c08058da3e7f11b356ac27e0c427d36f33f2 ]

Commit 581c4484769e ("HID: input: map digitizer battery usage") added
handling of battery events for digitizers (typically for batteries
presented in stylii). Digitizers typically report correct battery levels
only when stylus is actively touching the surface, and in other cases
they may report battery level of 0. To avoid confusing consumers of the
battery information the code was added to filer out reports with 0
battery levels.

However there exist other kinds of devices that may legitimately report
0 battery levels. Fix this by filtering out 0-level reports only for
digitizer usages, and continue reporting them for other kinds of devices
(Smart Batteries, etc).

Reported-by: 卢国宏 <luguohong@xiaomi.com>
Fixes: 581c4484769e ("HID: input: map digitizer battery usage")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index f5c217ac4bfaa7014b78f4a2f4a3dcc44c0668c9..f073d5621050a1343601a3977a87f1326411b2ae 100644 (file)
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -622,7 +622,10 @@ static void hidinput_update_battery(struct hid_device *dev, unsigned int usage,
                return;
        }
 
-       if (value == 0 || value < dev->battery_min || value > dev->battery_max)
+       if ((usage & HID_USAGE_PAGE) == HID_UP_DIGITIZER && value == 0)
+               return;
+
+       if (value < dev->battery_min || value > dev->battery_max)
                return;
 
        capacity = hidinput_scale_battery_capacity(dev, value);