[platform] Accton AS7712-32X. Update for sensors and sfputil (#1197)

Revise kernel driver to duplicate nodes for support of lm-sensors, at fan and PSU.
Update sfputil.py to to fit new SfpUtil prototype.

Signed-off-by: roylee123 <[email protected]>

device/accton/x86_64-accton_as7712_32x-r0/plugins/sfputil.py

@@ -1,19 +1,19 @@
 #!/usr/bin/env python
 
 try:
-    from sonic_sfp.sfputilbase import sfputilbase
+    from sonic_sfp.sfputilbase import SfpUtilBase 
 except ImportError, e:
     raise ImportError (str(e) + "- required module not found")
 
 
-class sfputil(sfputilbase):
-    """Platform specific sfputil class"""
+class SfpUtil(SfpUtilBase):
+    """Platform specific SfpUtill class"""
 
-    port_start = 0
-    port_end = 31
+    _port_start = 0
+    _port_end = 31
     ports_in_block = 32
 
-    port_to_eeprom_mapping = {}
+    _port_to_eeprom_mapping = {}
     port_to_i2c_mapping = {
          9 : 18,
         10 : 19,
@@ -51,10 +51,58 @@ class sfputil(sfputilbase):
 
     _qsfp_ports = range(0, ports_in_block + 1)
 
-    def __init__(self, port_num):
-        # Override port_to_eeprom_mapping for class initialization
+    def __init__(self):
         eeprom_path = '/sys/bus/i2c/devices/{0}-0050/sfp_eeprom'
-        for x in range(self.port_start, self.port_end + 1):
+        for x in range(0, self._port_end + 1):
             port_eeprom_path = eeprom_path.format(self.port_to_i2c_mapping[x+1])
-            self.port_to_eeprom_mapping[x] = port_eeprom_path
-        sfputilbase.__init__(self, port_num)
+            self._port_to_eeprom_mapping[x] = port_eeprom_path
+        SfpUtilBase.__init__(self)
+
+    def reset(self, port_num):
+         return True
+    def set_low_power_mode(self, port_nuM, lpmode):
+         return True
+    def get_low_power_mode(self, port_num):
+         return True
+
+#    def get_presence(self, port_num):
+#         return True
+
+    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
+
+        path = "/sys/bus/i2c/devices/{0}-0050/sfp_is_present"
+        port_ps = path.format(self.port_to_i2c_mapping[port_num+1])
+
+
+        try:
+            reg_file = open(port_ps)
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+            return False
+
+        reg_value = reg_file.readline().rstrip()
+        if reg_value == '1':
+            return True
+
+        return False
+
+    @property
+    def port_start(self):
+        return self._port_start
+
+    @property
+    def port_end(self):
+        return self._port_end
+
+    @property
+    def qsfp_ports(self):
+        return range(0, self.ports_in_block + 1)
+
+    @property 
+    def port_to_eeprom_mapping(self):
+         return self._port_to_eeprom_mapping
+
+