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UpKbdBacklight: Send notifications about hardware brightness changes

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Backlights, starting with kernel 4.11 [1] can have a
"brightness_hw_changed" sysfs attribute,  which can be polled to detect
hardware initiated brightness changes, such as ones done through
firmware-handled keyboard backlight hotkeys, or firmware controlled
changes (eg. turn off backlight on low battery).

[1] https://patchwork.kernel.org/patch/9544111/

https://bugs.freedesktop.org/show_bug.cgi?id=98404
This commit is contained in:
Hans de Goede 2016-10-16 12:53:19 +02:00 • committed by Bastien Nocera
parent d28ee53aa5
commit 0e256ece04
1 changed files with 38 additions and 0 deletions
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38
src/up-kbd-backlight.c
View file

@ -43,6 +43,8 @@ static void up_kbd_backlight_finalize (GObject *object);
struct UpKbdBacklightPrivate
{
gint fd;
gint fd_hw_changed;
GIOChannel *channel_hw_changed;
gint max_brightness;
};
@ -209,6 +211,24 @@ up_kbd_backlight_class_init (UpKbdBacklightClass *klass)
g_type_class_add_private (klass, sizeof (UpKbdBacklightPrivate));
}
/**
* up_kbd_backlight_event_io:
**/
static gboolean
up_kbd_backlight_event_io (GIOChannel *channel, GIOCondition condition, gpointer data)
{
UpKbdBacklight *kbd_backlight = (UpKbdBacklight*) data;
gint brightness;
if (!(condition & G_IO_PRI))
return FALSE;
brightness = up_kbd_backlight_brightness_read (kbd_backlight, kbd_backlight->priv->fd_hw_changed);
up_kbd_backlight_emit_change (kbd_backlight, brightness, "internal");
return TRUE;
}
/**
* up_kbd_backlight_find:
**/
@ -223,6 +243,7 @@ up_kbd_backlight_find (UpKbdBacklight *kbd_backlight)
gchar *dir_path = NULL;
gchar *path_max = NULL;
gchar *path_now = NULL;
gchar *path_hw_changed = NULL;
gchar *buf_max = NULL;
gchar *buf_now = NULL;
GError *error = NULL;
@ -273,6 +294,14 @@ up_kbd_backlight_find (UpKbdBacklight *kbd_backlight)
if (up_kbd_backlight_brightness_read (kbd_backlight, kbd_backlight->priv->fd) < 0)
goto out;
path_hw_changed = g_build_filename (dir_path, "brightness_hw_changed", NULL);
kbd_backlight->priv->fd_hw_changed = open (path_hw_changed, O_RDONLY);
if (kbd_backlight->priv->fd_hw_changed >= 0) {
kbd_backlight->priv->channel_hw_changed = g_io_channel_unix_new (kbd_backlight->priv->fd_hw_changed);
g_io_add_watch (kbd_backlight->priv->channel_hw_changed,
G_IO_PRI, up_kbd_backlight_event_io, kbd_backlight);
}
/* success */
found = TRUE;
out:
@ -281,6 +310,7 @@ out:
g_free (dir_path);
g_free (path_max);
g_free (path_now);
g_free (path_hw_changed);
g_free (buf_max);
g_free (buf_now);
return found;
@ -316,6 +346,14 @@ up_kbd_backlight_finalize (GObject *object)
kbd_backlight = UP_KBD_BACKLIGHT (object);
kbd_backlight->priv = UP_KBD_BACKLIGHT_GET_PRIVATE (kbd_backlight);
if (kbd_backlight->priv->channel_hw_changed) {
g_io_channel_shutdown (kbd_backlight->priv->channel_hw_changed, FALSE, NULL);
g_io_channel_unref (kbd_backlight->priv->channel_hw_changed);
}
if (kbd_backlight->priv->fd_hw_changed >= 0)
close (kbd_backlight->priv->fd_hw_changed);
/* close file */
if (kbd_backlight->priv->fd >= 0)
close (kbd_backlight->priv->fd);