60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* kb_led.c
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*
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* Copyright (C) 2017 Jeremy Soller <jeremy@system76.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define SET_KB_LED 0x67
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static enum led_brightness kb_led_brightness = LED_OFF;
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static enum led_brightness kb_led_get(struct led_classdev *led_cdev) {
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return kb_led_brightness;
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}
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static int kb_led_set(struct led_classdev *led_cdev, enum led_brightness value) {
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if (!s76_wmbb(SET_KB_LED, 0xF4000000 | value, NULL)) {
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kb_led_brightness = value;
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}
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return 0;
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}
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static struct led_classdev kb_led = {
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.name = "system76::kbd_backlight",
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.flags = LED_BRIGHT_HW_CHANGED,
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.brightness_get = kb_led_get,
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.brightness_set_blocking = kb_led_set,
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.max_brightness = 255,
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};
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static int __init kb_led_init(struct device *dev) {
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int err;
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err = led_classdev_register(dev, &kb_led);
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if (unlikely(err)) {
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return err;
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}
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return 0;
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}
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static void __exit kb_led_exit(void) {
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if (!IS_ERR_OR_NULL(kb_led.dev)) {
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led_classdev_unregister(&kb_led);
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}
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}
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