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HID: hid-input: occasionally report stylus battery even if not changed

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There are styluses that only report their battery status when they are
touching the touchscreen; additionally we currently suppress battery
reports if capacity has not changed. To help userspace recognize how long
ago the device reported battery status, let's send the change event through
if either capacity has changed, or at least 30 seconds have passed since
last report we've let through.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
dmitry.torokhov@gmail.com
2020-09-30 15:47:13 -07:00
committed by Jiri Kosina
parent bf36c6b946
commit c6838eeef2
2 changed files with 5 additions and 1 deletions
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5
drivers/hid/hid-input.c
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@@ -534,9 +534,12 @@ static void hidinput_update_battery(struct hid_device *dev, int value)
capacity = hidinput_scale_battery_capacity(dev, value);
if (dev->battery_status != HID_BATTERY_REPORTED ||
capacity != dev->battery_capacity) {
capacity != dev->battery_capacity ||
ktime_after(ktime_get_coarse(), dev->battery_ratelimit_time)) {
dev->battery_capacity = capacity;
dev->battery_status = HID_BATTERY_REPORTED;
dev->battery_ratelimit_time =
ktime_add_ms(ktime_get_coarse(), 30 * 1000);
power_supply_changed(dev->battery);
}
}