[devices]: Fix for build break for device s6100/z9100 from #2441 checkin (#2477)

Author: sridhar-ravindran

platform/broadcom/sonic-platform-modules-dell/common/io_rd_wr.py

@@ -0,0 +1,93 @@
+#!/usr/bin/python
+#Script to read/write the io based registers
+
+import sys
+import os
+import getopt
+import struct
+
+io_resource='/dev/port'
+
+def usage():
+    ''' This is the Usage Method '''
+
+    print 'Utility for IO read/write'
+    print '\t\t io_rd_wr.py --get --offset <offset>'
+    print '\t\t io_rd_wr.py --set --val <val>  --offset <offset>'
+    sys.exit(1)
+
+def io_reg_read(io_resource,offset):
+    fd=os.open(io_resource, os.O_RDONLY)
+    if(fd<0):
+        print 'file open failed %s"%io_resource'
+        return
+    if(os.lseek(fd, offset, os.SEEK_SET) != offset):
+        print 'lseek failed on %s'%io_resource
+        return
+    buf=os.read(fd,1)
+    reg_val1=ord(buf)
+    print 'reg value %x'%reg_val1
+    os.close(fd)
+
+def io_reg_write(io_resource,offset,val):
+    fd=os.open(io_resource,os.O_RDWR)
+    if(fd<0):
+        print 'file open failed %s"%io_resource'
+        return
+    if(os.lseek(fd, offset, os.SEEK_SET) != offset):
+        print 'lseek failed on %s'%io_resource
+        return
+    ret=os.write(fd,struct.pack('B',val))
+    if(ret != 1):
+        print 'write failed %d'%ret
+        return
+    os.close(fd)
+
+def main(argv):
+
+    ''' The main function will read the user input from the
+    command line argument and  process the request  '''
+
+    opts = ''
+    val = ''
+    choice = ''
+    resouce = ''
+    offset = ''
+
+    try:
+        opts, args = getopt.getopt(argv, "hgs:" , \
+        ["val=","offset=","help", "get", "set"])
+
+    except getopt.GetoptError:
+        usage()
+
+    for opt,arg in opts:
+
+        if opt in ('-h','--help'):
+            choice = 'help'
+
+        elif opt in ('-g', '--get'):
+            choice = 'get'
+
+        elif opt in ('-s', '--set'):
+            choice = 'set'
+
+        elif opt ==  '--offset':
+            offset = int(arg,16)
+
+        elif opt ==  '--val':
+            val = int(arg,16)
+
+    if choice == 'get' and offset != '':
+        io_reg_read(io_resource,offset)
+
+    elif choice == 'set' and offset != '' and val != '':
+        io_reg_write(io_resource,offset,val)
+
+    else:
+        usage()
+
+#Calling the main method
+if __name__ == "__main__":
+    main(sys.argv[1:])
+