192 lines
6.1 KiB
C
192 lines
6.1 KiB
C
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/*
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* Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
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*
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* This software may be freely used, copied, modified, and distributed
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* provided that the above copyright notice is preserved in all copies of the
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* software.
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*/
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/* -*-C-*-
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*
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*
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*
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* Project: ANGEL
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*
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* Title: Definitions for device driver interface.
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*/
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#ifndef angsd_drivers_h
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#define angsd_drivers_h
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#include "rxtx.h"
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#ifndef __cplusplus
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typedef struct DeviceDescr DeviceDescr;
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typedef struct DriverCall DriverCall;
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#endif
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/*
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* used to pass packets across the driver interface
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*/
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struct DriverCall
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{
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struct data_packet dc_packet;
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void *dc_context;
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};
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/*
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* used to describe a device driver
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*/
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struct DeviceDescr
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{
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char *DeviceName;
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int (*DeviceOpen)(const char *name, const char *arg);
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int (*DeviceMatch)(const char *name, const char *arg);
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void (*DeviceClose)(void);
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int (*DeviceRead)(DriverCall *dc, bool block);
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int (*DeviceWrite)(DriverCall *dc);
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int (*DeviceIoctl)(const int opcode, void *args);
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void *SwitcherState; /* used by switcher interface */
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};
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/*
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* Function: DeviceOpen
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*
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* Purpose: Open a communications device
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*
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* Pre-conditions: No previous open is still active
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*
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* Params:
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* Input: name Identifies which device to open. This can either be
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* a host specific identifier (e.g. "/dev/ttya",
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* "COM1:"), or a number which is used to refer to
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* `standard' interfaces, so "1" would be the first host
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* interface, "2" the second, and so on.
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*
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* arg Driver specific arguments. For example, some serial
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* drivers accept speed and control arguments such as
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* "9600" or "19200/NO_BREAK". These arguments are
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* completely free-form: it is the individual drivers
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* which do the necessary interpretation.
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*
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* Returns:
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* OK: 0
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* Error: -1
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*/
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extern int DeviceOpen(const char *name, const char *arg);
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/*
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* Function: DeviceMatch
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*
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* Purpose: Check whether parameters are OK to be passed to DeviceOpen
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*
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* Params:
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* Input: name Identifies which device to open. This can either be
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* a host specific identifier (e.g. "/dev/ttya",
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* "COM1:"), or a number which is used to refer to
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* `standard' interfaces, so "1" would be the first host
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* interface, "2" the second, and so on.
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*
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* arg Driver specific arguments. For example, some serial
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* drivers accept speed and control arguments such as
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* "9600" or "19200/NO_BREAK". These arguments are
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* completely free-form: it is the individual drivers
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* which do the necessary interpretation.
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*
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* Returns:
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* OK: 0
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* Error: -1
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*/
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extern int DeviceMatch(const char *name, const char *arg);
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/*
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* Function: DeviceClose
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*
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* Purpose: Close a communications device
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*
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* Pre-conditions: Device must have been previously opened
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*
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* Params: None
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*
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* Returns: Nothing
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*/
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extern void DeviceClose(void);
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/*
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* Function: DeviceRead
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*
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* Purpose: Try to read a complete packet from a communications device.
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* This read must usually be non-blocking, i.e. it should read as
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* many data from the device as needed to complete the packet,
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* but it should not wait if the packet is not complete, and no
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* more data are currently available from the device.
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* As an optimisation the read can optionally block when 'block'
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* is TRUE, but only for a short time. It is acceptable for the
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* 'block' parameter to be ignored in which case all reads
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* should be non-blocking.
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*
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* Pre-conditions: Device has been opened via DeviceOpen()
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*
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* Params:
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* In/Out: dc Describes the packet being read (dc->dc_packet);
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* dc->dc_context is for the driver to store private
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* context, and is guaranteed to be NULL the first
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* time DeviceRead is called for a given packet.
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*
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* In: block If TRUE, read may safely block for a short period
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* of time (say up to 20ms), to avoid high CPU load
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* whilst waiting for a reply.
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* If FALSE, read MUST NOT block.
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*
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* Returns:
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* OK: 1 (packet is complete)
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* 0 (packet is not yet complete)
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* Error: -1 bad packet
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*
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* Post-conditions: should a calamatous error occur panic() will be called
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*/
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extern int DeviceRead(DriverCall *dc, bool block);
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/*
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* Function: DeviceWrite
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*
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* Purpose: Try to write a packet to a communications device. This write
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* must be non-blocking, i.e. it should write as many data to
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* the device as is immediately possible, but should not wait
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* for space to send any more after that.
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*
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* Pre-conditions: Device has been opened via DeviceOpen()
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*
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* Params:
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* In/Out: dc Describes the packet being written (dc->dc_packet);
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* dc->dc_context is for the driver to store private
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* context, and is guaranteed to be NULL the first
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* time DeviceWrite is called for a given packet.
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*
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* Returns:
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* OK: 1 (all of the packet has been written)
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* 0 (some of the packet remains to be written)
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* Error: -1
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*/
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extern int DeviceWrite(DriverCall *dc);
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/*
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* Function: DeviceIoctl
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*
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* Purpose: Perform miscellaneous driver operations
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*
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* Pre-conditions: Device has been open via DeviceOpen()
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*
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* Params:
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* Input: opcode Reason code indicating the operation to perform
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* In/Out: args Pointer to opcode-sensitive arguments/result space
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*
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* Returns:
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* OK: 0
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* Error: -1
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*/
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extern int DeviceIoctl(const int opcode, void *args);
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#endif /* !defined(angsd_drivers_h) */
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/* EOF drivers.h */
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