mirror of
https://gitlab.freedesktop.org/upower/upower.git
synced 2025-12-20 06:40:04 +01:00
linux: up-kbd-backlight-led: the keyboard backlight control implementation for Linux
The implementation for Linux included: 1. Set and get brightness. 2. Get max brightness. 3. Signal if the brightness was changed by the device.
This commit is contained in:
Kate Hsuan
parent
1d40bc2027
commit
e01aa7c903
3 changed files with 380 additions and 0 deletions
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@ -18,6 +18,8 @@ upshared += { 'linux': static_library('upshared',
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'up-device-wup.h',
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'up-device-bluez.c',
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'up-device-bluez.h',
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'up-kbd-backlight-led.c',
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'up-kbd-backlight-led.h',
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'up-input.c',
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'up-input.h',
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'up-backend.c',
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323
src/linux/up-kbd-backlight-led.c
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323
src/linux/up-kbd-backlight-led.c
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@ -0,0 +1,323 @@
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
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*
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* Copyright (C) 2025 Kate Hsuan <p.hsuan@gmail.com>
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*
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* Licensed under the GNU General Public License Version 2
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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
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <glib/gi18n.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include "up-kbd-backlight-led.h"
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#include "up-native.h"
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#include "up-types.h"
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static void up_kbd_backlight_led_finalize (GObject *object);
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struct UpKbdBacklightLedPrivate
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{
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gint max_brightness;
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guint brightness;
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gint fd_hw_changed;
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GIOChannel *channel_hw_changed;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (UpKbdBacklightLed, up_kbd_backlight_led, UP_TYPE_DEVICE_KBD_BACKLIGHT)
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/**
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* up_kbd_backlight_led_brightness_write:
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*
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* Write the brightness value to the LED device with a given path.
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**/
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static gboolean
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up_kbd_backlight_led_brightness_write (UpDeviceKbdBacklight *kbd_backlight, const gchar *native_path, gint value)
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{
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UpKbdBacklightLed *kbd;
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UpKbdBacklightLedPrivate *priv;
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g_autoptr (GString) value_str = g_string_new (NULL);
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g_return_val_if_fail (UP_IS_DEVICE_KBD_BACKLIGHT (kbd_backlight), FALSE);
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kbd = UP_KBD_BACKLIGHT_LED (kbd_backlight);
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priv = up_kbd_backlight_led_get_instance_private (kbd);
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g_string_printf (value_str, "%d", CLAMP (value, 0, priv->max_brightness));
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if (!g_file_set_contents_full (native_path, value_str->str, value_str->len,
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G_FILE_SET_CONTENTS_ONLY_EXISTING, 0644, NULL)) {
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g_debug ("Failed on setting keyboard backlight LED brightness: %s", native_path);
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return FALSE;
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}
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return TRUE;
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}
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/**
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* up_kbd_backlight_led_brightness_read:
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*
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* Read the brightness value from the LED device with a given path.
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**/
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static gint
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up_kbd_backlight_led_brightness_read (UpDeviceKbdBacklight *kbd_backlight, const gchar *native_path)
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{
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g_autofree gchar *buf = NULL;
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gint64 brightness = -1;
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g_return_val_if_fail (UP_IS_DEVICE_KBD_BACKLIGHT (kbd_backlight), brightness);
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if (!g_file_get_contents (native_path, &buf, NULL, NULL))
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return -1;
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g_strstrip (buf);
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g_debug ("brightness: %s", buf);
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brightness = g_ascii_strtoll (buf, NULL, 10);
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if (brightness < 0) {
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g_warning ("failed to convert brightness.");
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return -1;
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}
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return brightness;
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}
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/**
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* up_kbd_backlight_led_set_brightness:
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*
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* Set the brightness.
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**/
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static gboolean
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up_kbd_backlight_led_set_brightness (UpDeviceKbdBacklight *kbd_backlight, gint value)
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{
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GObject *native;
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g_autofree gchar *filename = NULL;
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const gchar *native_path;
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gboolean ret = FALSE;
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native = up_device_kbd_backlight_get_native (UP_DEVICE_KBD_BACKLIGHT (kbd_backlight));
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g_return_val_if_fail (native != NULL, FALSE);
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native_path = up_native_get_native_path (native);
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g_return_val_if_fail (native_path != NULL, FALSE);
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filename = g_build_filename (native_path, "brightness", NULL);
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ret = up_kbd_backlight_led_brightness_write (kbd_backlight, filename, value);
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return ret;
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}
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/**
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* up_kbd_backlight_led_get_brightness:
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*
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* Get the brightness.
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**/
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static gint
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up_kbd_backlight_led_get_brightness (UpDeviceKbdBacklight *kbd_backlight)
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{
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GObject *native;
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const gchar *native_path;
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g_autofree gchar *filename = NULL;
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gint brightness = -1;
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native = up_device_kbd_backlight_get_native (UP_DEVICE_KBD_BACKLIGHT (kbd_backlight));
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g_return_val_if_fail (native != NULL, brightness);
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native_path = up_native_get_native_path (native);
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g_return_val_if_fail (native_path != NULL, brightness);
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filename = g_build_filename (native_path, "brightness", NULL);
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brightness = up_kbd_backlight_led_brightness_read (kbd_backlight, filename);
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return brightness;
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}
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/**
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* up_kbd_backlight_led_get_max_brightness:
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*
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* Gets the max brightness.
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**/
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static gint
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up_kbd_backlight_led_get_max_brightness (UpDeviceKbdBacklight *kbd_backlight)
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{
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UpKbdBacklightLed *kbd = UP_KBD_BACKLIGHT_LED (kbd_backlight);
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UpKbdBacklightLedPrivate *priv = up_kbd_backlight_led_get_instance_private (kbd);
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return priv->max_brightness;
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}
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/**
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* up_kbd_backlight_led_event_io:
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*
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* This function is called when the brightness of the LED device changes.
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**/
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static gboolean
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up_kbd_backlight_led_event_io (GIOChannel *channel, GIOCondition condition, gpointer data)
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{
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UpDeviceKbdBacklight *kbd_backlight = UP_DEVICE_KBD_BACKLIGHT (data);
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UpKbdBacklightLed *kbd = UP_KBD_BACKLIGHT_LED (kbd_backlight);
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UpKbdBacklightLedPrivate *priv = up_kbd_backlight_led_get_instance_private (kbd);
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gint brightness = 0;
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gchar buf[16];
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g_autofree gchar *ret_str = NULL;
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glong len;
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gchar *end = NULL;
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if (priv->fd_hw_changed < 0)
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return FALSE;
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if (!(condition & G_IO_PRI))
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return FALSE;
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lseek (priv->fd_hw_changed, 0, SEEK_SET);
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len = read (priv->fd_hw_changed, buf, G_N_ELEMENTS (buf) - 1);
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if (len > 0) {
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buf[len] = '\0';
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g_strstrip (buf);
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brightness = g_ascii_strtoll (buf, &end, 10);
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if (brightness < 0 ||
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brightness > priv->max_brightness ||
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end == buf) {
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brightness = -1;
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g_warning ("kbd eventio: failed to convert brightness.");
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}
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}
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g_debug ("kbd eventio: brightness: %d", brightness);
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if (brightness < 0)
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return FALSE;
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if (brightness >= 0)
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up_device_kbd_backlight_emit_change (kbd_backlight, brightness, "internal");
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return TRUE;
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}
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/**
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* up_kbd_backlight_led_coldplug:
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*
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* Update the LED settings to UpKbdBacklightLed device.
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**/
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static gboolean
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up_kbd_backlight_led_coldplug (UpDeviceKbdBacklight *kbd_backlight)
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{
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UpKbdBacklightLed *kbd;
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UpKbdBacklightLedPrivate *priv;
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GObject *native;
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g_autofree gchar *filename = NULL;
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g_autofree gchar *path_hw_changed = NULL;
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const gchar *native_path = NULL;
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g_return_val_if_fail (UP_IS_DEVICE_KBD_BACKLIGHT (kbd_backlight), FALSE);
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kbd = UP_KBD_BACKLIGHT_LED (kbd_backlight);
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priv = up_kbd_backlight_led_get_instance_private (kbd);
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native = up_device_kbd_backlight_get_native (kbd_backlight);
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if (native == NULL) {
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priv->max_brightness = 0;
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return FALSE;
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}
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native_path = up_native_get_native_path (native);
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filename = g_build_filename (native_path, "max_brightness", NULL);
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priv->max_brightness = up_kbd_backlight_led_brightness_read (kbd_backlight, filename);
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/* Set up device watcher */
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path_hw_changed = g_build_filename (native_path, "brightness_hw_changed", NULL);
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priv->fd_hw_changed = open (path_hw_changed, O_RDONLY);
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if (priv->fd_hw_changed >= 0) {
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priv->channel_hw_changed = g_io_channel_unix_new (priv->fd_hw_changed);
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g_io_add_watch (priv->channel_hw_changed,
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G_IO_PRI, up_kbd_backlight_led_event_io, kbd_backlight);
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}
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return TRUE;
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}
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/**
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* up_kbd_backlight_led_finalize:
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**/
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static void
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up_kbd_backlight_led_finalize (GObject *object)
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{
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UpKbdBacklightLed *kbd_backlight;
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UpKbdBacklightLedPrivate *priv;
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g_return_if_fail (object != NULL);
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g_return_if_fail (UP_IS_KBD_BACKLIGHT_LED (object));
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kbd_backlight = UP_KBD_BACKLIGHT_LED (object);
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priv = up_kbd_backlight_led_get_instance_private (kbd_backlight);
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if (priv->channel_hw_changed) {
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g_io_channel_shutdown (priv->channel_hw_changed, FALSE, NULL);
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g_io_channel_unref (priv->channel_hw_changed);
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}
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if (priv->fd_hw_changed >= 0)
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close (priv->fd_hw_changed);
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G_OBJECT_CLASS (up_kbd_backlight_led_parent_class)->finalize (object);
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}
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/**
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* up_kbd_backlight_led_class_init:
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**/
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static void
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up_kbd_backlight_led_class_init (UpKbdBacklightLedClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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UpDeviceKbdBacklightClass *dev_kbd_klass = UP_DEVICE_KBD_BACKLIGHT_CLASS (klass);
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object_class->finalize = up_kbd_backlight_led_finalize;
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dev_kbd_klass->coldplug = up_kbd_backlight_led_coldplug;
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dev_kbd_klass->get_max_brightness = up_kbd_backlight_led_get_max_brightness;
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dev_kbd_klass->get_brightness = up_kbd_backlight_led_get_brightness;
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dev_kbd_klass->set_brightness = up_kbd_backlight_led_set_brightness;
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}
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/**
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* up_kbd_backlight_led_init:
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**/
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static void
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up_kbd_backlight_led_init (UpKbdBacklightLed *kbd_backlight)
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{
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kbd_backlight->priv = up_kbd_backlight_led_get_instance_private (kbd_backlight);
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}
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/**
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* up_kbd_backlight_led_new:
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**/
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UpKbdBacklightLed *
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up_kbd_backlight_led_new (void)
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{
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return g_object_new (UP_TYPE_KBD_BACKLIGHT_LED, NULL);
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}
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55
src/linux/up-kbd-backlight-led.h
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55
src/linux/up-kbd-backlight-led.h
Normal file
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@ -0,0 +1,55 @@
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
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*
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* Copyright (C) 2025 Kate Hsuan <p.hsuan@gmail.com>
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*
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* Licensed under the GNU General Public License Version 2
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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
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __UP_KBD_BACKLIGHT_LED_H
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#define __UP_KBD_BACKLIGHT_LED_H
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#include <glib-object.h>
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#include "up-device-kbd-backlight.h"
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G_BEGIN_DECLS
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#define UP_TYPE_KBD_BACKLIGHT_LED (up_kbd_backlight_led_get_type ())
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#define UP_KBD_BACKLIGHT_LED(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), UP_TYPE_KBD_BACKLIGHT_LED, UpKbdBacklightLed))
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#define UP_KBD_BACKLIGHT_LED_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), UP_TYPE_KBD_BACKLIGHT_LED, UpKbdBacklightLedClass))
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#define UP_IS_KBD_BACKLIGHT_LED(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), UP_TYPE_KBD_BACKLIGHT_LED))
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#define UP_IS_KBD_BACKLIGHT_LED_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), UP_TYPE_KBD_BACKLIGHT_LED))
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#define UP_KBD_BACKLIGHT_LED_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), UP_TYPE_KBD_BACKLIGHT_LED, UpKbdBacklightLedClass))
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typedef struct UpKbdBacklightLedPrivate UpKbdBacklightLedPrivate;
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typedef struct
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{
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UpDeviceKbdBacklight parent;
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UpKbdBacklightLedPrivate *priv;
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} UpKbdBacklightLed;
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typedef struct
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{
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UpDeviceKbdBacklightClass parent_class;
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} UpKbdBacklightLedClass;
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UpKbdBacklightLed *up_kbd_backlight_led_new (void);
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GType up_kbd_backlight_led_get_type (void);
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G_END_DECLS
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#endif /* __UP_KBD_BACKLIGHT_LED_H */
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