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Correctly read screen backlight for gmux backlight control. #41

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Correctly read screen backlight for gmux backlight control. #41

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36 changes: 23 additions & 13 deletions functions.c
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Original file line number Diff line number Diff line change
Expand Up @@ -83,12 +83,25 @@ int get_screen_backlight_value() {
int fd, actual_backlight, max_backlight;
char buf[5];
struct stat tmp;
const char *scr_backlight="/sys/class/backlight/acpi_video0/actual_brightness";
const char *scr_maxbacklight="/sys/class/backlight/acpi_video0/max_brightness";
const char *scr_backlights[]={
"/sys/class/backlight/acpi_video0/actual_brightness",
"/sys/class/backlight/gmux_backlight/actual_brightness"};
const char *scr_maxbacklights[]={
"/sys/class/backlight/acpi_video0/max_brightness",
"/sys/class/backlight/gmux_backlight/max_brightness"};
ssize_t cnt;
int ret=0, backlight=15;
int ret=0, backlight=15;
size_t i;

if (stat(scr_backlight, &tmp) == 0) {

// Try both locations of screen brightness files
for (i = 0; i < sizeof(scr_backlights) / sizeof(const char **); ++ i) {
const char *scr_backlight = scr_backlights[i];
const char *scr_maxbacklight = scr_maxbacklights[i];

/* This backlight file does not exist. Try next one. */
if (stat(scr_backlight, &tmp) == -1)
continue;

/* read screen backlight value */
fd = open(scr_backlight, O_RDONLY);
Expand Down Expand Up @@ -116,16 +129,13 @@ int get_screen_backlight_value() {

/* make sure we always return a value between 0 and 15 */
return (15*actual_backlight)/max_backlight;

} else {
// fallback to xbacklight
// we prefer to avoid this because it forks xbacklight

backlight = get_screen_xbacklight_value();
ret = dbus_to_acpi_backlight(backlight);
return ret;

}

// fallback to xbacklight
// we prefer to avoid this because it forks xbacklight
backlight = get_screen_xbacklight_value();
ret = dbus_to_acpi_backlight(backlight);
return ret;
}

int dbus_to_acpi_backlight(int backlight) {
Expand Down