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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
View File

@ -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);
}
}

1
include/linux/hid.h
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@ -585,6 +585,7 @@ struct hid_device { /* device report descriptor */
__s32 battery_report_id;
enum hid_battery_status battery_status;
bool battery_avoid_query;
ktime_t battery_ratelimit_time;
#endif
unsigned long status; /* see STAT flags above */