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Adjust brightness according to the limit

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Seems like some platforms feature non-standard maximums, but the
variable is correclty exported for us to use
This commit is contained in:
David Guillen Fandos 2021-03-20 22:19:28 +01:00
parent a83af11754
commit e1385c0187
1 changed files with 16 additions and 10 deletions
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26
frontend/drivers/platform_unix.c
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@ -1325,19 +1325,25 @@ static void frontend_unix_get_lakka_version(char *s,
static void frontend_unix_set_screen_brightness(int value)
{
int brightness = 0;
char *buffer = NULL;
char svalue[16] = {0};
#if defined(HAVE_LAKKA_SWITCH)
/* Values from 0 to 100 */
brightness = value;
#elif defined(HAVE_ODROIDGO2)
/* GOA screen PWM value does not linearly relate to perceived brightness */
brightness = (pow(1.0369f, value) - 1) * 7;
#endif
unsigned int max_brightness = 100;
#if !defined(HAVE_LAKKA_SWITCH)
filestream_read_file("/sys/devices/platform/backlight/backlight/backlight/max_brightness",
&buffer, NULL);
if (buffer)
{
sscanf(buffer, "%u", &max_brightness);
free(buffer);
}
#endif
snprintf(svalue, sizeof(svalue), "%d\n", brightness);
/* Calculate the brightness */
value = (value * max_brightness) / 100;
snprintf(svalue, sizeof(svalue), "%d\n", value);
filestream_write_file("/sys/class/backlight/backlight/brightness",
svalue, strlen(svalue));
svalue, strlen(svalue));
}
#endif