1 .. SPDX-License-Identifier: GPL-2.0+
2 LG Gram laptop extra features
3 =============================
5 By Matan Ziv-Av <matan@svgalib.org>
11 The following FN keys are ignored by the kernel without this driver:
12 - FN-F1 (LG control panel) - Generates F15
13 - FN-F5 (Touchpad toggle) - Generates F13
14 - FN-F6 (Airplane mode) - Generates RFKILL
15 - FN-F8 (Keyboard backlight) - Generates F16.
16 This key also changes keyboard backlight mode.
17 - FN-F9 (Reader mode) - Generates F14
19 The rest of the FN key work without a need for a special driver.
25 Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
26 reader mode. In this mode the screen colors change (blue color reduced),
27 and the reader mode indicator LED (on F9 key) turns on.
33 Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables
40 Writing 80/100 to /sys/devices/platform/lg-laptop/battery_care_limit
41 sets the maximum capacity to charge the battery. Limiting the charge
42 reduces battery capacity loss over time.
44 This value is reset to 100 when the kernel boots.
50 Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables
57 Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables
58 charging another device from the USB port while the device is turned off.
60 This value is reset to 0 when the kernel boots.
66 The are two LED devices supported by the driver:
71 A led device named kbd_led controls the keyboard backlight. There are three
72 lighting level: off (0), low (127) and high (255).
74 The keyboard backlight is also controlled by the key combination FN-F8
75 which cycles through those levels.
78 Touchpad indicator LED
79 ----------------------
81 On the F5 key. Controlled by led device names tpad_led.