| .. SPDX-License-Identifier: GPL-2.0+ |
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| LG Gram laptop extra features |
| ============================= |
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| By Matan Ziv-Av <matan@svgalib.org> |
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| Hotkeys |
| ------- |
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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 |
| - FN-F5 (Touchpad toggle) - Generates F21 |
| - FN-F6 (Airplane mode) - Generates RFKILL |
| - 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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| Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables |
| reader mode. In this mode the screen colors change (blue color reduced), |
| and the reader mode indicator LED (on F9 key) turns on. |
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| FN Lock |
| ------- |
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| Writing 0/1 to /sys/devices/platform/lg-laptop/fn_lock disables/enables |
| FN lock. |
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| Battery care limit |
| ------------------ |
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| Writing 80/100 to /sys/class/power_supply/CMB0/charge_control_end_threshold |
| sets the maximum capacity to charge the battery. Limiting the charge |
| 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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| Writing 1/0 to /sys/devices/platform/lg-laptop/fan_mode disables/enables |
| the fan silent mode. |
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| USB charge |
| ---------- |
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| Writing 0/1 to /sys/devices/platform/lg-laptop/usb_charge disables/enables |
| 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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| The are two LED devices supported by the driver: |
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| Keyboard backlight |
| ------------------ |
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| A led device named kbd_led controls the keyboard backlight. There are three |
| 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 |
| which cycles through those levels. |
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| Touchpad indicator LED |
| ---------------------- |
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| On the F5 key. Controlled by led device names tpad_led. |
