sonic-buildimage/device/accton/x86_64-accton_as7312_54xs-r0/plugins/sfputil.py

# sfputil.py
#
# Platform-specific SFP transceiver interface for SONiC
#

try:
    import time
    import string
    from ctypes import create_string_buffer
    from sonic_sfp.sfputilbase import SfpUtilBase
except ImportError as e:
    raise ImportError("%s - required module not found" % str(e))


class SfpUtil(SfpUtilBase):
    """Platform-specific SfpUtil class"""

    PORT_START = 1
    PORT_END = 54
    PORTS_IN_BLOCK = 54
    QSFP_PORT_START = 49
    QSFP_PORT_END = 54

    BASE_VAL_PATH = "/sys/class/i2c-adapter/i2c-{0}/{1}-0050/"

    _port_to_is_present = {}
    _port_to_lp_mode = {}

    _port_to_eeprom_mapping = {}
    _cpld_mapping = {
       0:  "4-0060",
       1:  "5-0062",
       2:  "6-0064",
           }
    _port_to_i2c_mapping = {
           1:  18, 
           2:  19, 
           3:  20, 
           4:  21, 
           5:  22, 
           6:  23, 
           7:  24, 
           8:  25, 
           9:  26,
           10: 27,
           11: 28,
           12: 29,
           13: 30,
           14: 31,
           15: 32,
           16: 33,
           17: 34,
           18: 35,
           19: 36,
           20: 37,
           21: 38,
           22: 39,
           23: 40,
           24: 41,
           25: 42,
           26: 43,
           27: 44,
           28: 45,
           29: 46,
           30: 47,
           31: 48,
           32: 49,
           33: 50,
           34: 51,
           35: 52,
           36: 53,
           37: 54,
           38: 55,
           39: 56,
           40: 57,
           41: 58,
           42: 59,
           43: 60,
           44: 61,
           45: 62,
           46: 63,
           47: 64,
           48: 65,
           49: 66, #QSFP49
           50: 67,
           51: 68,
           52: 69,
           53: 70,
           54: 71, #QSFP54
           }

    @property
    def port_start(self):
        return self.PORT_START

    @property
    def port_end(self):
        return self.PORT_END

    @property
    def qsfp_port_start(self):
        return self.QSFP_PORT_START

    @property
    def qsfp_port_end(self):
        return self.QSFP_PORT_END
    
    @property
    def qsfp_ports(self):
        return range(self.QSFP_PORT_START, self.PORTS_IN_BLOCK + 1)

    @property
    def port_to_eeprom_mapping(self):
        return self._port_to_eeprom_mapping

    def __init__(self):
        eeprom_path = '/sys/bus/i2c/devices/{0}-0050/eeprom'
        for x in range(self.port_start, self.port_end+1):
            self.port_to_eeprom_mapping[x] = eeprom_path.format(
                self._port_to_i2c_mapping[x])

        SfpUtilBase.__init__(self)

    def get_cpld_num(self, port_num):             
        cpld_i = 1
        if (port_num > 24 and port_num < self.qsfp_port_start):
            cpld_i = 2

        if (port_num > 52): 
            cpld_i = 2

        return cpld_i

    def get_presence(self, port_num):
        # Check for invalid port_num
        if port_num < self.port_start or port_num > self.port_end:
            return False
        
        cpld_i = self.get_cpld_num(port_num)

        cpld_ps = self._cpld_mapping[cpld_i]
        path = "/sys/bus/i2c/devices/{0}/module_present_{1}"
        port_ps = path.format(cpld_ps, port_num)

        try:
            val_file = open(port_ps)
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)          
            return False

        content = val_file.readline().rstrip()
        val_file.close()

        # content is a string, either "0" or "1"
        if content == "1":
            return True

        return False

    def get_low_power_mode(self, port_num):
        # Check for invalid port_num
        if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
            return False

        try:
            eeprom = None

            if not self.get_presence(port_num):
                return False

            eeprom = open(self.port_to_eeprom_mapping[port_num], "rb")
            eeprom.seek(93)
            lpmode = ord(eeprom.read(1))

            if ((lpmode & 0x3) == 0x3):
                return True # Low Power Mode if "Power override" bit is 1 and "Power set" bit is 1
            else:
                return False # High Power Mode if one of the following conditions is matched:
                             # 1. "Power override" bit is 0
                             # 2. "Power override" bit is 1 and "Power set" bit is 0 
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False
        finally:
            if eeprom is not None:
                eeprom.close()
                time.sleep(0.01)

    def set_low_power_mode(self, port_num, lpmode): 
        # Check for invalid port_num
        if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
            return False

        try:
            eeprom = None

            if not self.get_presence(port_num):
                return False # Port is not present, unable to set the eeprom

            # Fill in write buffer
            regval = 0x3 if lpmode else 0x1 # 0x3:Low Power Mode, 0x1:High Power Mode
            buffer = create_string_buffer(1)
            buffer[0] = chr(regval)

            # Write to eeprom
            eeprom = open(self.port_to_eeprom_mapping[port_num], "r+b")
            eeprom.seek(93)
            eeprom.write(buffer[0])
            return True
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False
        finally:
            if eeprom is not None:
                eeprom.close()
                time.sleep(0.01)

    def reset(self, port_num):
        if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
            return False
         
        cpld_i = self.get_cpld_num(port_num)
        cpld_ps = self._cpld_mapping[cpld_i]
        path = "/sys/bus/i2c/devices/{0}/module_reset_{1}"
        port_ps = path.format(cpld_ps, port_num)
        try:
            reg_file = open(port_ps, 'w')
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)          
            return False

        reg_value = '0'

        reg_file.write(reg_value)
        reg_file.close()
        
        return True

    def get_transceiver_change_event(self):
        """
        TODO: This function need to be implemented
        when decide to support monitoring SFP(Xcvrd)
        on this platform.
        """
        raise NotImplementedError