Hi everyone, This patch adds support for reporting battery status (charging/discharging) for devices with a charging usage in their HID descriptor: 0x05, 0x85, /* Usage Page (Battery System), */ 0x09, 0x44, /* Usage Page (Charging), */ I tested it on Apple hardware (mouse, trackpad and keyboard) as well as on UCLogic tablets with battery [1]. On other hardware (HID_DC_BATTERYSTRENGTH or digitizers with battery) discharging should be reported for backwards compatibility. I did my best to keep the old behaviour by adding KUnit tests; However, I don't own any of those devices, so I'd appreciate any help testing the patch from someone with the actual hardware. Best wishes, José Expósito [1] https://lore.kernel.org/linux-input/20221028082348.22386-1-jose.exposito89@xxxxxxxxx/T/ José Expósito (1): HID: input: map battery system charging drivers/hid/.kunitconfig | 1 + drivers/hid/Kconfig | 1 + drivers/hid/hid-input-test.c | 80 ++++++++++++++++++++++++++++++++++++ drivers/hid/hid-input.c | 36 +++++++++++++++- include/linux/hid.h | 2 + 5 files changed, 118 insertions(+), 2 deletions(-) create mode 100644 drivers/hid/hid-input-test.c -- 2.25.1
