246 lines
7.9 KiB
Python
246 lines
7.9 KiB
Python
#!/usr/bin/env python
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#############################################################################
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# Mellanox
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#
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# Module contains an implementation of SONiC Platform Base API and
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# provides the FANs status which are available in the platform
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#
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#############################################################################
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import os.path
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try:
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from sonic_platform_base.fan_base import FanBase
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except ImportError as e:
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raise ImportError (str(e) + "- required module not found")
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LED_ON = 1
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LED_OFF = 0
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PWM_MAX = 255
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FAN_PATH = "/var/run/hw-management/thermal/"
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LED_PATH = "/var/run/hw-management/led/"
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class Fan(FanBase):
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"""Platform-specific Fan class"""
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def __init__(self, fan_index, drawer_index = 1, psu_fan = False):
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# API index is starting from 0, Mellanox platform index is starting from 1
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self.index = fan_index + 1
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self.drawer_index = drawer_index + 1
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self.is_psu_fan = psu_fan
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self.fan_min_speed_path = "fan{}_min".format(self.index)
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if not self.is_psu_fan:
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self.fan_speed_get_path = "fan{}_speed_get".format(self.index)
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self.fan_speed_set_path = "fan{}_speed_set".format(self.index)
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self.fan_presence_path = "fan{}_status".format(self.drawer_index)
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self.fan_max_speed_path = "fan{}_max".format(self.index)
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else:
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self.fan_speed_get_path = "psu{}_fan1_speed_get".format(self.index)
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self.fan_presence_path = "psu{}_fan1_speed_get".format(self.index)
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self.fan_max_speed_path = "psu{}_max".format(self.index)
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self.fan_status_path = "fan{}_fault".format(self.index)
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self.fan_green_led_path = "led_fan{}_green".format(self.drawer_index)
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self.fan_red_led_path = "led_fan{}_red".format(self.drawer_index)
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self.fan_orange_led_path = "led_fan{}_orange".format(self.drawer_index)
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self.fan_pwm_path = "pwm1"
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self.fan_led_cap_path = "led_fan{}_capability".format(self.drawer_index)
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def get_status(self):
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"""
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Retrieves the operational status of fan
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Returns:
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bool: True if fan is operating properly, False if not
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"""
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status = 0
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if self.is_psu_fan:
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status = 1
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else:
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try:
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with open(os.path.join(FAN_PATH, self.fan_status_path), 'r') as fault_status:
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status = int(fault_status.read())
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except (ValueError, IOError):
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status = 0
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return status == 1
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def get_presence(self):
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"""
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Retrieves the presence status of fan
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Returns:
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bool: True if fan is present, False if not
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"""
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status = 0
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if self.is_psu_fan:
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if os.path.exists(os.path.join(FAN_PATH, self.fan_presence_path)):
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status = 1
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else:
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status = 0
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else:
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try:
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with open(os.path.join(FAN_PATH, self.fan_presence_path), 'r') as presence_status:
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status = int(presence_status.read())
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except (ValueError, IOError):
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status = 0
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return status == 1
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def _get_min_speed_in_rpm(self):
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speed = 0
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try:
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with open(os.path.join(FAN_PATH, self.fan_min_speed_path), 'r') as min_fan_speed:
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speed = int(min_fan_speed.read())
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except (ValueError, IOError):
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speed = 0
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return speed
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def _get_max_speed_in_rpm(self):
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speed = 0
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try:
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with open(os.path.join(FAN_PATH, self.fan_max_speed_path), 'r') as max_fan_speed:
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speed = int(max_fan_speed.read())
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except (ValueError, IOError):
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speed = 0
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return speed
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def get_speed(self):
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"""
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Retrieves the speed of fan
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Returns:
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int: percentage of the max fan speed
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"""
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speed = 0
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try:
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with open(os.path.join(FAN_PATH, self.fan_speed_get_path), 'r') as fan_curr_speed:
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speed_in_rpm = int(fan_curr_speed.read())
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except (ValueError, IOError):
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speed_in_rpm = 0
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max_speed_in_rpm = self._get_max_speed_in_rpm()
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speed = 100*speed_in_rpm/max_speed_in_rpm
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return speed
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def get_target_speed(self):
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"""
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Retrieves the expected speed of fan
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Returns:
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int: percentage of the max fan speed
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"""
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speed = 0
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if self.is_psu_fan:
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# Not like system fan, psu fan speed can not be modified, so target speed is N/A
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return speed
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try:
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with open(os.path.join(FAN_PATH, self.fan_speed_set_path), 'r') as fan_pwm:
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pwm = int(fan_pwm.read())
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except (ValueError, IOError):
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pwm = 0
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speed = int(round(pwm*100.0/PWM_MAX))
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return speed
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def set_speed(self, speed):
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"""
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Set fan speed to expected value
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Args:
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speed: An integer, the percentage of full fan speed to set fan to,
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in the range 0 (off) to 100 (full speed)
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Returns:
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bool: True if set success, False if fail.
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"""
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status = True
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pwm = int(round(PWM_MAX*speed/100.0))
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if self.is_psu_fan:
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#PSU fan speed is not setable.
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return False
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try:
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with open(os.path.join(FAN_PATH, self.fan_speed_set_path), 'w') as fan_pwm:
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fan_pwm.write(str(pwm))
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except (ValueError, IOError):
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status = False
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return status
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def _get_led_capability(self):
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cap_list = None
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try:
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with open(os.path.join(LED_PATH, self.fan_led_cap_path), 'r') as fan_led_cap:
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caps = fan_led_cap.read()
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cap_list = caps.split()
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except (ValueError, IOError):
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status = 0
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return cap_list
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def set_status_led(self, color):
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"""
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Set led to expected color
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Args:
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color: A string representing the color with which to set the
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fan module status LED
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Returns:
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bool: True if set success, False if fail.
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"""
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led_cap_list = self._get_led_capability()
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if led_cap_list is None:
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return False
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if self.is_psu_fan:
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# PSU fan led status is not able to set
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return False
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status = False
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try:
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if color == 'green':
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with open(os.path.join(LED_PATH, self.fan_green_led_path), 'w') as fan_led:
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fan_led.write(str(LED_ON))
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elif color == 'red':
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# Some fan don't support red led but support orange led, in this case we set led to orange
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if 'red' in led_cap_list:
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led_path = os.path.join(LED_PATH, self.fan_red_led_path)
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elif 'orange' in led_cap_list:
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led_path = os.path.join(LED_PATH, self.fan_orange_led_path)
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else:
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return False
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with open(led_path, 'w') as fan_led:
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fan_led.write(str(LED_ON))
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elif color == 'off':
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with open(os.path.join(LED_PATH, self.fan_green_led_path), 'w') as fan_led:
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fan_led.write(str(LED_OFF))
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with open(os.path.join(LED_PATH, self.fan_red_led_path), 'w') as fan_led:
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fan_led.write(str(LED_OFF))
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else:
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status = False
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except (ValueError, IOError):
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status = False
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return status
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def get_speed_tolerance(self):
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"""
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Retrieves the speed tolerance of the fan
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Returns:
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An integer, the percentage of variance from target speed which is
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considered tolerable
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"""
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# The tolerance value is fixed as 20% for all the Mellanox platform
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return 20 |