blob: 9c822227b17282e9db27a6d9ff4684a49956d8ad [file] [log] [blame]
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
class GpioInterface(object):
"""Abstract class to be used by GPIO interface implementations."""
def open(self):
"""Opens access to GPIO's."""
raise NotImplementedError('open not yet implemented.')
def close(self):
"""Close access to GPIO's."""
raise NotImplementedError('close not yet implemented.')
def wr_rd(self, offset, width, dir_val=None, wr_val=None, chip=None,
"""Write and/or read GPIO bit.
offset : bit offset of the gpio to read or write
width : integer, number of contiguous bits in gpio to read or write
dir_val : direction value of the gpio. dir_val is interpretted as:
None : read the pins via libftdi's ftdi_read_pins
0 : configure as input
1 : configure as output
wr_val : value to write to the GPIO. Note wr_val is irrelevant if
dir_val = 0
chip : beaglebone gpio chip number. [IF REQUIRED]
muxfile : used to specify the correct omap_mux muxfile to select this
integer value from reading the gpio value ( masked & aligned )
raise NotImplementedError('wr_rd not yet implemented.')