[Mellanox] Initialize system LED color to green for 201911 (#4743)

* [Mellanox] Initialize system LED color to green for 201911

* Rename variable to make it more readable

platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py

@@ -48,6 +48,10 @@
 # Global logger class instance
 logger = Logger()
 
+# System LED system fs definitions for 201911 branch only
+SYSTEM_STATUS_LED_GREEN_FILE = '/run/hw-management/led/led_status_green'
+LED_ON = '1'
+
 # magic code defnition for port number, qsfp port position of each hwsku
 # port_position_tuple = (PORT_START, QSFP_PORT_START, PORT_END, PORT_IN_BLOCK, EEPROM_OFFSET)
 hwsku_dict_port = {'ACS-MSN2010': 3, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2700': 0, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'LS-SN2700':0, 'ACS-MSN2740': 0, 'ACS-MSN3700': 0, 'ACS-MSN3700C': 0, 'ACS-MSN3800': 4, 'Mellanox-SN3800-D112C8': 4, 'ACS-MSN4700': 0, 'ACS-MSN3420': 5, 'ACS-MSN4600C': 4}
@@ -73,6 +77,7 @@ def __init__(self):
  self.sfp_module_initialized = False
  self.sfp_event_initialized = False
  self.reboot_cause_initialized = False
+ self.initialize_system_led()
  logger.log_info("Chassis loaded successfully")
 
 
@@ -472,3 +477,14 @@ def get_thermal_manager(self):
  from .thermal_manager import ThermalManager
  return ThermalManager
 
+ def initialize_system_led(self):
+ """
+ Init system LED color to green.
+ This is for 201911 branch only
+ """
+ try:
+ with open(SYSTEM_STATUS_LED_GREEN_FILE, 'w') as f:
+ f.write(LED_ON)
+ except:
+ pass
+