[Platform] Marvell hwsku ET6448M i2c slave access fixes (#3275)

Signed-off-by: Antony Rheneus <arheneus@marvell.com>

device/marvell/armhf-marvell_et6448m_52x-r0/plugins/psuutil.py

@@ -1,7 +1,18 @@
 #!/usr/bin/env python
 
+import sys
 import os.path
-import subprocess
+if sys.version_info[0] < 3:
+    import commands as cmd
+else:
+    import subprocess as cmd
+
+smbus_present = 1
+try:
+   import smbus
+except ImportError as e:
+   smbus_present = 0 
+
 try:
     from sonic_psu.psu_base import PsuBase
 except ImportError as e:
@@ -21,34 +32,45 @@ def get_num_psus(self):
     def get_psu_status(self, index):
         if index is None:
            return False
-
-        cmdstatus, psustatus = subprocess.getstatusoutput('i2cget -y 0 0x41 0xa') #need to verify the cpld register logic
-        psustatus = int(psustatus, 16)
-        if cmdstatus == 0:
-            if index == 1:
-                psustatus = psustatus&4
-                if psustatus == 4 :
-                    return True
-            if index == 2:
-                psustatus = psustatus&8
-                if psustatus == 8 :
-                    return True
+        if smbus_present == 0: 
+             cmdstatus, psustatus = cmd.getstatusoutput('i2cget -y 0 0x41 0xa') #need to verify the cpld register logic
+             psustatus = int(psustatus, 16)
+        else :
+             bus = smbus.SMBus(0)
+             DEVICE_ADDRESS = 0x41
+             DEVICE_REG = 0xa
+             psustatus = bus.read_byte_data(DEVICE_ADDRESS, DEVICE_REG)
+        if index == 1:
+            psustatus = psustatus&4
+            if psustatus == 4 :
+               return True
+        if index == 2:
+            psustatus = psustatus&8
+            if psustatus == 8 :
+               return True
+
         return False
 
     def get_psu_presence(self, index):
         if index is None:
             return False
 
-        cmdstatus , psustatus = subprocess.getstatusoutput('i2cget -y 0 0x41 0xa') #need to verify the cpld register logic
-        psustatus = int(psustatus, 16)
-        if cmdstatus == 0:
-            if index == 1:
-                 psustatus = psustatus&1
-                 if psustatus == 1 :
-                     return True
-            if index == 2:
-                psustatus = psustatus&2
-                if psustatus == 2 :
-                    return True
+        if smbus_present == 0: 
+             cmdstatus, psustatus = cmd.getstatusoutput('i2cget -y 0 0x41 0xa') #need to verify the cpld register logic
+             psustatus = int(psustatus, 16)
+        else :
+             bus = smbus.SMBus(0)
+             DEVICE_ADDRESS = 0x41
+             DEVICE_REG = 0xa
+             psustatus = bus.read_byte_data(DEVICE_ADDRESS, DEVICE_REG)
+
+        if index == 1:
+             psustatus = psustatus&1
+             if psustatus == 1 :
+                 return True
+        if index == 2:
+            psustatus = psustatus&2
+            if psustatus == 2 :
+                return True
         return False
 

device/marvell/armhf-marvell_et6448m_52x-r0/plugins/sfputil.py

@@ -8,6 +8,12 @@
 except ImportError, e:
     raise ImportError (str(e) + "- required module not found")
 
+smbus_present = 1
+
+try:
+    import smbus
+except ImportError, e:
+    smbus_present = 0
 
 class SfpUtil(SfpUtilBase):
     """Platform specific sfputil class"""
@@ -37,14 +43,21 @@ def __init__(self):
 
         if not os.path.exists("/sys/bus/i2c/devices/0-0050") :
             os.system("echo optoe2 0x50 > /sys/bus/i2c/devices/i2c-0/new_device")
-        #os.system("echo optoe 0x50 > /sys/bus/i2c/devices/i2c-0/new_device")
 
-        #enable optic
-        os.system("i2cset -y -m 0x0f 0 0x41 0x5 0x00")
         eeprom_path = '/sys/bus/i2c/devices/0-0050/eeprom'
         for x in range(self.port_start, self.port_end + 1):
             port_eeprom_path = eeprom_path.format(self.port_to_i2c_mapping[x])
             self.port_to_eeprom_mapping[x] = port_eeprom_path
+        # Enable optical SFP Tx
+        if smbus_present == 0 :
+            os.system("i2cset -y -m 0x0f 0 0x41 0x5 0x00")
+        else :
+            bus = smbus.SMBus(0)
+            DEVICE_ADDRESS = 0x41
+            DEVICEREG = 0x5 
+            OPTIC_E =  bus.read_byte_data(DEVICE_ADDRESS, DEVICEREG)
+            OPTIC_E = OPTIC_E & 0xf0
+            bus.write_byte_data(DEVICE_ADDRESS, DEVICEREG, OPTIC_E) 
         SfpUtilBase.__init__(self)
 
     def reset(self, port_num):