.. SPDX-License-Identifier: GPL-2.0+
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LG Gram laptop extra features
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=============================
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By Matan Ziv-Av <matan@svgalib.org>
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Hotkeys
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-------
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The following FN keys are ignored by the kernel without this driver:
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- FN-F1 (LG control panel) - Generates F15
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- FN-F5 (Touchpad toggle) - Generates F13
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- FN-F6 (Airplane mode) - Generates RFKILL
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- FN-F8 (Keyboard backlight) - Generates F16.
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This key also changes keyboard backlight mode.
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- FN-F9 (Reader mode) - Generates F14
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The rest of the FN keys work without a need for a special driver.
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Reader mode
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-----------
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Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
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reader mode. In this mode the screen colors change (blue color reduced),
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and the reader mode indicator LED (on F9 key) turns on.
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FN Lock
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-------
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Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables
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FN lock.
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Battery care limit
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------------------
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Writing 80/100 to /sys/devices/platform/lg-laptop/battery_care_limit
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sets the maximum capacity to charge the battery. Limiting the charge
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reduces battery capacity loss over time.
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This value is reset to 100 when the kernel boots.
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Fan mode
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--------
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Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables
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the fan silent mode.
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USB charge
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----------
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Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables
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charging another device from the USB port while the device is turned off.
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This value is reset to 0 when the kernel boots.
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LEDs
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~~~~
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The are two LED devices supported by the driver:
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Keyboard backlight
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------------------
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A led device named kbd_led controls the keyboard backlight. There are three
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lighting level: off (0), low (127) and high (255).
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The keyboard backlight is also controlled by the key combination FN-F8
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which cycles through those levels.
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Touchpad indicator LED
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----------------------
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On the F5 key. Controlled by led device names tpad_led.
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