############################################################################# # Celestica # # Module contains an implementation of SONiC Platform Base API and # provides the fan status which are available in the platform # ############################################################################# import json import math import os.path try: from sonic_platform_base.fan_base import FanBase except ImportError as e: raise ImportError(str(e) + "- required module not found") EMC2305_PATH = "/sys/bus/i2c/drivers/emc2305/" FAN_PATH = "/sys/devices/platform/e1031.smc/" EMC2305_MAX_PWM = 255 EMC2305_FAN_PWM = "pwm{}" EMC2305_FAN_TARGET = "fan{}_target" EMC2305_FAN_INPUT = "pwm{}" FAN_NAME_LIST = ["FAN-1", "FAN-2", "FAN-3"] PSU_FAN_MAX_RPM = 11000 PSU_HWMON_PATH = "/sys/bus/i2c/devices/i2c-{0}/{0}-00{1}/hwmon" PSU_I2C_MAPPING = { 0: { "num": 13, "addr": "5b" }, 1: { "num": 12, "addr": "5a" }, } class Fan(FanBase): """Platform-specific Fan class""" def __init__(self, fan_tray_index, fan_index=0, is_psu_fan=False, psu_index=0): self.fan_index = fan_index self.fan_tray_index = fan_tray_index self.is_psu_fan = is_psu_fan if self.is_psu_fan: self.psu_index = psu_index self.psu_i2c_num = PSU_I2C_MAPPING[self.psu_index]["num"] self.psu_i2c_addr = PSU_I2C_MAPPING[self.psu_index]["addr"] self.psu_hwmon_path = PSU_HWMON_PATH.format( self.psu_i2c_num, self.psu_i2c_addr) # e1031 fan attributes # Single emc2305 chip located at i2c-23-4d # to control a fan module self.emc2305_chip_mapping = [ { 'device': "23-004d", 'index_map': [1, 2, 4] } ] self.fan_e1031_presence = "fan{}_prs" self.fan_e1031_direction = "fan{}_dir" self.fan_e1031_led = "fan{}_led" self.fan_e1031_led_col_map = { self.STATUS_LED_COLOR_GREEN: "green", self.STATUS_LED_COLOR_RED: "amber", self.STATUS_LED_COLOR_OFF: "off" } FanBase.__init__(self) def __read_txt_file(self, file_path): try: with open(file_path, 'r') as fd: data = fd.read() return data.strip() except IOError: pass return "" def __write_txt_file(self, file_path, value): try: with open(file_path, 'w') as fd: fd.write(str(value)) except: return False return True def __search_file_by_name(self, directory, file_name): for dirpath, dirnames, files in os.walk(directory): for name in files: file_path = os.path.join(dirpath, name) if name in file_name: return file_path return None def get_direction(self): """ Retrieves the direction of fan Returns: A string, either FAN_DIRECTION_INTAKE or FAN_DIRECTION_EXHAUST depending on fan direction """ direction = self.FAN_DIRECTION_EXHAUST if not self.is_psu_fan: fan_direction_file = (FAN_PATH + self.fan_e1031_direction.format(self.fan_tray_index+1)) raw = self.__read_txt_file(fan_direction_file).strip('\r\n') direction = self.FAN_DIRECTION_INTAKE if str( raw).upper() == "F2B" else self.FAN_DIRECTION_EXHAUST return direction def get_speed(self): """ Retrieves the speed of fan as a percentage of full speed Returns: An integer, the percentage of full fan speed, in the range 0 (off) to 100 (full speed) Note: speed = pwm_in/255*100 """ speed = 0 if self.is_psu_fan: fan_speed_sysfs_name = "fan{}_input".format(self.fan_index+1) fan_speed_sysfs_path = self.__search_file_by_name( self.psu_hwmon_path, fan_speed_sysfs_name) fan_speed_rpm = self.__read_txt_file(fan_speed_sysfs_path) or 0 fan_speed_raw = float(fan_speed_rpm)/PSU_FAN_MAX_RPM * 100 speed = math.ceil(float(fan_speed_rpm) * 100 / PSU_FAN_MAX_RPM) elif self.get_presence(): chip = self.emc2305_chip_mapping[self.fan_index] device = chip['device'] fan_index = chip['index_map'] sysfs_path = "%s%s/%s" % ( EMC2305_PATH, device, EMC2305_FAN_INPUT) sysfs_path = sysfs_path.format(fan_index[self.fan_tray_index]) raw = self.__read_txt_file(sysfs_path).strip('\r\n') pwm = int(raw, 10) if raw else 0 speed = math.ceil(float(pwm * 100 / EMC2305_MAX_PWM)) return int(speed) def get_target_speed(self): """ Retrieves the target (expected) speed of the fan Returns: An integer, the percentage of full fan speed, in the range 0 (off) to 100 (full speed) Note: speed_pc = pwm_target/255*100 0 : when PWM mode is use pwm : when pwm mode is not use """ target = 0 if not self.is_psu_fan: chip = self.emc2305_chip_mapping[self.fan_index] device = chip['device'] fan_index = chip['index_map'] sysfs_path = "%s%s/%s" % ( EMC2305_PATH, device, EMC2305_FAN_TARGET) sysfs_path = sysfs_path.format(fan_index[self.fan_tray_index]) raw = self.__read_txt_file(sysfs_path).strip('\r\n') pwm = int(raw, 10) if raw else 0 target = math.ceil(float(pwm) * 100 / EMC2305_MAX_PWM) return target def get_speed_tolerance(self): """ Retrieves the speed tolerance of the fan Returns: An integer, the percentage of variance from target speed which is considered tolerable """ return 10 def set_speed(self, speed): """ Sets the fan speed Args: speed: An integer, the percentage of full fan speed to set fan to, in the range 0 (off) to 100 (full speed) Returns: A boolean, True if speed is set successfully, False if not Note: Depends on pwm or target mode is selected: 1) pwm = speed_pc * 255 <-- Currently use this mode. 2) target_pwm = speed_pc * 100 / 255 2.1) set pwm{}_enable to 3 """ pwm = speed * 255 / 100 if not self.is_psu_fan and self.get_presence(): chip = self.emc2305_chip_mapping[self.fan_index] device = chip['device'] fan_index = chip['index_map'] sysfs_path = "%s%s/%s" % ( EMC2305_PATH, device, EMC2305_FAN_PWM) sysfs_path = sysfs_path.format(fan_index[self.fan_tray_index]) return self.__write_txt_file(sysfs_path, int(pwm)) return False def set_status_led(self, color): """ Sets the state of the fan module status LED Args: color: A string representing the color with which to set the fan module status LED Returns: bool: True if status LED state is set successfully, False if not """ set_status_led = False if not self.is_psu_fan: fan_led_file = (FAN_PATH + self.fan_e1031_led.format(self.fan_tray_index+1)) set_status_led = self.__write_txt_file( fan_led_file, self.fan_e1031_led_col_map[color]) if self.get_presence() else False return set_status_led def get_name(self): """ Retrieves the name of the device Returns: string: The name of the device """ fan_name = FAN_NAME_LIST[self.fan_tray_index] if not self.is_psu_fan else "PSU-{} FAN-{}".format( self.psu_index+1, self.fan_index+1) return fan_name def get_presence(self): """ Retrieves the presence of the PSU Returns: bool: True if PSU is present, False if not """ fan_direction_file = (FAN_PATH + self.fan_e1031_presence.format(self.fan_tray_index+1)) present_str = self.__read_txt_file(fan_direction_file) or '1' return int(present_str) == 0 if not self.is_psu_fan else True