mirror of
https://github.com/commaai/agnos-builder.git
synced 2026-07-09 16:52:05 +08:00
Adeeb Shihadeh
49 lines
1.3 KiB
Python
Executable File
49 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
import time
|
|
|
|
# limit display brightness with display uptime to prevent burn in
|
|
|
|
BL_OFF = 4
|
|
BL_POWER_PATH = "/sys/class/backlight/panel0-backlight/bl_power"
|
|
BRIGHTNESS_PATH = "/sys/class/backlight/panel0-backlight/brightness"
|
|
MAX_BRIGHTNESS_PATH= "/sys/devices/platform/soc/soc:qcom,dsi-display@0/max_brightness_percent"
|
|
|
|
MAX_PERCENT = 90
|
|
MIN_PERCENT = 30
|
|
HOURLY_PERC_DECREASE = 5
|
|
|
|
def read(path: str) -> int:
|
|
try:
|
|
with open(path) as f:
|
|
return int(f.read())
|
|
except Exception:
|
|
return 0
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
last_perc = None
|
|
last_off_ts = time.monotonic()
|
|
|
|
while True:
|
|
try:
|
|
# sample brightness and backlight power
|
|
bl_power = read(BL_POWER_PATH)
|
|
brightness = read(BRIGHTNESS_PATH)
|
|
if bl_power == BL_OFF or brightness == 0:
|
|
last_off_ts = time.monotonic()
|
|
|
|
# calculate new max
|
|
uptime_hours = (time.monotonic() - last_off_ts) / (60*60)
|
|
clipped_perc = MAX_PERCENT - (HOURLY_PERC_DECREASE*uptime_hours)
|
|
clipped_perc = int(max(min(clipped_perc, MAX_PERCENT), MIN_PERCENT))
|
|
|
|
if clipped_perc != last_perc:
|
|
with open(MAX_BRIGHTNESS_PATH, 'w') as f:
|
|
f.write(f"{int(clipped_perc)}\n")
|
|
last_perc = clipped_perc
|
|
except Exception:
|
|
pass
|
|
|
|
time.sleep(5)
|