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1.. SPDX-License-Identifier: GPL-2.0+2 3 4LG Gram laptop extra features5=============================6 7By Matan Ziv-Av <matan@svgalib.org>8 9 10Hotkeys11-------12 13The following FN keys are ignored by the kernel without this driver:14 15- FN-F1 (LG control panel) - Generates F1516- FN-F5 (Touchpad toggle) - Generates F2117- FN-F6 (Airplane mode) - Generates RFKILL18- FN-F9 (Reader mode) - Generates F1419 20The rest of the FN keys work without a need for a special driver.21 22 23Reader mode24-----------25 26Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables27reader mode. In this mode the screen colors change (blue color reduced),28and the reader mode indicator LED (on F9 key) turns on.29 30 31FN Lock32-------33 34Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables35FN lock.36 37 38Battery care limit39------------------40 41Writing 80/100 to /sys/class/power_supply/CMB0/charge_control_end_threshold42sets the maximum capacity to charge the battery. Limiting the charge43reduces battery capacity loss over time.44 45This value is reset to 100 when the kernel boots.46 47 48Fan mode49--------50 51Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables52the fan silent mode.53 54 55USB charge56----------57 58Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables59charging another device from the USB port while the device is turned off.60 61This value is reset to 0 when the kernel boots.62 63 64LEDs65~~~~66 67The are two LED devices supported by the driver:68 69Keyboard backlight70------------------71 72A led device named kbd_led controls the keyboard backlight. There are three73lighting level: off (0), low (127) and high (255).74 75The keyboard backlight is also controlled by the key combination FN-F876which cycles through those levels.77 78 79Touchpad indicator LED80----------------------81 82On the F5 key. Controlled by led device names tpad_led.83