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/*
* Copyright (c) 2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*
*
* Authors: Peter Enns
*/
/** @file
* All i2c devices should derive from this class.
*/
#ifndef __DEV_I2CDEV__
#define __DEV_I2CDEV__
#include "base/types.hh"
#include "params/I2CDevice.hh"
#include "sim/sim_object.hh"
class I2CDevice : public SimObject
{
protected:
uint8_t _addr;
public:
I2CDevice(const I2CDeviceParams* p)
: SimObject(p), _addr(p->i2c_addr)
{ }
virtual ~I2CDevice() { }
/**
* Return the next message that the device expects to send. This
* will likely have side effects (e.g., incrementing a register
* pointer).
*
* @return 8-bit message the device has been set up to send
*/
virtual uint8_t read() = 0;
/**
* Perform any actions triggered by an i2c write (save msg in a
* register, perform an interrupt, update a register pointer or
* command register, etc...)
*
* @param msg 8-bit message from master
*/
virtual void write(uint8_t msg) = 0;
/**
* Perform any initialization necessary for the device when it
* received a start signal from the bus master (devices frequently
* expect the first write to be a register address)
*/
virtual void i2cStart() = 0;
uint8_t i2cAddr() const { return _addr; }
};
#endif // __DEV_I2CDEV__
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