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107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
/*
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* \brief I2C session client implementation
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* \author Jean-Adrien Domage <jean-adrien.domage@gapfruit.com>
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* \date 2021-02-25
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*/
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/*
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* Copyright (C) 2013-2021 Genode Labs GmbH
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* Copyright (C) 2021 gapfruit AG
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__I2C_SESSION__I2C_SESSION_H_
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#define _INCLUDE__I2C_SESSION__I2C_SESSION_H_
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#include <session/session.h>
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#include <base/stdint.h>
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namespace I2c {
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using namespace Genode;
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struct Session;
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}
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struct I2c::Session : public Genode::Session
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{
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/**
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* \noapi
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*/
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static char const *service_name() { return "I2c"; }
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enum { CAP_QUOTA = 2 };
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/***************
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** Exception **
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***************/
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/**
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* Execption thrown in case of a bus error
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*
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* This exception is thrown by the driver incase of a timeout, device missing
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* acknoledgement and bus arbitration lost. The driver can be configured in the run script
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* to log descriptive messages incase of errors.
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*/
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class Bus_error : public Exception {};
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/***********************
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** Session interface **
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***********************/
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/**
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* Write 8 bits on the bus
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*
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* \param byte The 8 bits to be sent
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*
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* \throw I2c::Session::Bus_error An error occured while performing an operation on the bus
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*/
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virtual void write_8bits(uint8_t byte) = 0;
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/**
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* Read 8 bits from the bus
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*
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* \throw I2c::Session::Bus_error An error occured while performing an operation on the bus
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*
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* \return The 8 received bits
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*/
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virtual uint8_t read_8bits() = 0;
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/**
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* Write 16 bits on the bus
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*
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* \param word The 16 bits to be sent
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*
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* \throw I2c::Session::Bus_error An error occured while performing an operation on the bus
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*/
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virtual void write_16bits(uint16_t word) = 0;
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/**
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* Read 16 bits from the bus
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*
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* \throw I2c::Session::Bus_error An error occured while performing an operation on the bus
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*
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* \return The 16 received bits
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*/
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virtual uint16_t read_16bits() = 0;
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GENODE_RPC_THROW(Rpc_write_8bits, void, write_8bits,
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GENODE_TYPE_LIST(Bus_error),
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uint8_t);
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GENODE_RPC_THROW(Rpc_read_8bits, uint8_t, read_8bits,
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GENODE_TYPE_LIST(Bus_error));
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GENODE_RPC_THROW(Rpc_write_16bits, void, write_16bits,
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GENODE_TYPE_LIST(Bus_error),
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uint16_t);
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GENODE_RPC_THROW(Rpc_read_16bits, uint16_t, read_16bits,
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GENODE_TYPE_LIST(Bus_error));
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GENODE_RPC_INTERFACE(Rpc_write_8bits, Rpc_read_8bits,
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Rpc_write_16bits, Rpc_read_16bits);
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};
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#endif /* _INCLUDE__I2C_SESSION__I2C_SESSION_H_ */
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