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HID: input: throttle battery uevents

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The power_supply subsystem tends to emit uevent every time
power_supply_changed() is called, so we should call this API only when battery
strength reported by the device is actually different from the previous
readings, otherwise we'll drown the system in uevents.

Fixes: 581c448476 ("HID: input: map digitizer battery usage")
Signed-off-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Dmitry Torokhov 2017-08-10 12:47:56 -07:00 • committed by Jiri Kosina
commit 0152b29c89
1 changed files with 9 additions and 3 deletions
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12
drivers/hid/hid-input.c
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@ -520,15 +520,21 @@ static void hidinput_cleanup_battery(struct hid_device *dev)
static void hidinput_update_battery(struct hid_device *dev, int value)
{
int capacity;
if (!dev->battery)
return;
if (value == 0 || value < dev->battery_min || value > dev->battery_max)
return;
dev->battery_capacity = hidinput_scale_battery_capacity(dev, value);
dev->battery_reported = true;
power_supply_changed(dev->battery);
capacity = hidinput_scale_battery_capacity(dev, value);
if (!dev->battery_reported || capacity != dev->battery_capacity) {
dev->battery_capacity = capacity;
dev->battery_reported = true;
power_supply_changed(dev->battery);
}
}
#else /* !CONFIG_HID_BATTERY_STRENGTH */
static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,