276 lines
8.1 KiB
C
276 lines
8.1 KiB
C
/*
|
|
* Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
|
|
*
|
|
* This software may be freely used, copied, modified, and distributed
|
|
* provided that the above copyright notice is preserved in all copies of the
|
|
* software.
|
|
*/
|
|
|
|
/* -*-C-*-
|
|
*
|
|
* $Revision$
|
|
* $Date$
|
|
*
|
|
*/
|
|
#ifndef angsd_devsw_h
|
|
#define angsd_devsw_h
|
|
|
|
#include "devclnt.h"
|
|
#include "adperr.h"
|
|
#include "drivers.h"
|
|
|
|
#ifndef __cplusplus
|
|
typedef struct Packet Packet;
|
|
typedef struct DevSWState DevSWState;
|
|
#endif
|
|
|
|
/*
|
|
* the basic structure used for passing packets around
|
|
*/
|
|
struct Packet
|
|
{
|
|
struct Packet *pk_next; /* XXX first field in struct */
|
|
unsigned int pk_length;
|
|
unsigned char *pk_buffer;
|
|
};
|
|
|
|
/*
|
|
* control structure, used for maintaining device switcher state
|
|
*/
|
|
struct DevSWState
|
|
{
|
|
unsigned int ds_opendevchans; /* bitmap of open device channels */
|
|
|
|
/*
|
|
* queue of packets read for the various device channels
|
|
*/
|
|
Packet *ds_readqueue[DC_NUM_CHANNELS];
|
|
|
|
/*
|
|
* structures for managing active read and write operations
|
|
*/
|
|
Packet *ds_nextreadpacket;
|
|
DriverCall ds_activeread;
|
|
DriverCall ds_activewrite;
|
|
};
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* Function: DevSW_AllocatePacket
|
|
* Purpose: Claim some memory to hold a struct Packet, and the buffer for
|
|
* that packet.
|
|
*
|
|
* Params:
|
|
* Input: length Size of the buffer in struct Packet.
|
|
*
|
|
* Returns:
|
|
* OK: Pointer to the newly malloc()ed Packet.
|
|
* Error: NULL
|
|
*/
|
|
Packet *DevSW_AllocatePacket(const unsigned int length);
|
|
|
|
/*
|
|
* Function: DevSW_FreePacket
|
|
* Purpose: Free the memory associated with a struct Packet.
|
|
*
|
|
* Pre-conditions The structure must have been originally claimed
|
|
* via DevSW_AllocatePacket.
|
|
*
|
|
* Params:
|
|
* Input: pk The packet to be freed.
|
|
*
|
|
* Returns: Nothing
|
|
*/
|
|
void DevSW_FreePacket(Packet *pk);
|
|
|
|
/*
|
|
* Function: DevSW_Open
|
|
* Purpose: Open the specified device driver
|
|
*
|
|
* Params:
|
|
* Input: name Identifies which device to open. This can either be
|
|
* a host specific identifier (e.g. "/dev/ttya",
|
|
* "COM1:"), or a number which is used to refer to
|
|
* `standard' interfaces, so "1" would be the first host
|
|
* interface, "2" the second, and so on.
|
|
*
|
|
* arg Driver specific arguments. For example, some serial
|
|
* drivers accept speed and control arguments such as
|
|
* "9600" or "19200/NO_BREAK". These arguments are
|
|
* completely free-form: it is the individual drivers
|
|
* which do the necessary interpretation.
|
|
*
|
|
* type The type of packet the caller is interested in. Only
|
|
* one open is allowed for each type of packet.
|
|
*
|
|
* In/Out: device The device driver to open
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_device_open_failed
|
|
* adp_device_already_open
|
|
* adp_malloc_failure
|
|
*/
|
|
AdpErrs DevSW_Open(DeviceDescr *device, const char *name, const char *arg,
|
|
const DevChanID type);
|
|
|
|
/*
|
|
* Function: DevSW_Match
|
|
* Purpose: Minimal veneer for DeviceMatch
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to match.
|
|
*
|
|
* name Identifies which device to open. This can either be
|
|
* a host specific identifier (e.g. "/dev/ttya",
|
|
* "COM1:"), or a number which is used to refer to
|
|
* `standard' interfaces, so "1" would be the first host
|
|
* interface, "2" the second, and so on.
|
|
*
|
|
* arg Driver specific arguments. For example, some serial
|
|
* drivers accept speed and control arguments such as
|
|
* "9600" or "19200/NO_BREAK". These arguments are
|
|
* completely free-form: it is the individual drivers
|
|
* which do the necessary interpretation.
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_failed
|
|
*/
|
|
AdpErrs DevSW_Match(const DeviceDescr *device, const char *name,
|
|
const char *arg);
|
|
|
|
/*
|
|
* Function: DevSW_Close
|
|
* Purpose: Close the specified device driver. All packets of the type
|
|
* used by the caller held within the switching layer will
|
|
* be discarded.
|
|
*
|
|
* Pre-conditions: Device must have been previously opened.
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to close
|
|
*
|
|
* type The type of packet the caller was interested in.
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_device_not_open
|
|
*/
|
|
AdpErrs DevSW_Close(DeviceDescr *device, const DevChanID type);
|
|
|
|
/*
|
|
* Function: DevSW_Read
|
|
* Purpose: Read a packet of appropriate type from the device driver
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to read packet from.
|
|
*
|
|
* type The type of packet the caller is interested in.
|
|
*
|
|
* Output: packet Pointer to new packet (if one is available)
|
|
* NULL (if no complete packet is available)
|
|
*
|
|
* Input: block If TRUE, read may safely block for a short period
|
|
* of time (say up to 20ms), to avoid high CPU load
|
|
* whilst waiting for a reply.
|
|
* If FALSE, read MUST NOT block.
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_bad_packet
|
|
*
|
|
* Post-conditions: The calling function is responsible for freeing the
|
|
* resources used by the packet when it is no longer
|
|
* needed.
|
|
*/
|
|
AdpErrs DevSW_Read(const DeviceDescr *device, const DevChanID type,
|
|
Packet **packet, bool block);
|
|
|
|
/*
|
|
* Function: DevSW_Write
|
|
* Purpose: Try to write a packet to the device driver. The write will
|
|
* be bounced if another write is still in progress.
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to write a packet to.
|
|
*
|
|
* packet The packet to be written.
|
|
*
|
|
* type The type to be assigned to the packet.
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_illegal_args
|
|
* adp_write_busy
|
|
*
|
|
* Post-conditions: The calling function retains "ownership" of the packet,
|
|
* i.e. it is responsible for freeing the resources used
|
|
* by the packet when it is no longer needed.
|
|
*/
|
|
AdpErrs DevSW_Write(const DeviceDescr *device, Packet *packet, DevChanID type);
|
|
|
|
/*
|
|
* Function: DevSW_FlushPendingWrite
|
|
* Purpose: If a write is in progress, give it a chance to finish.
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to flush.
|
|
*
|
|
* Returns:
|
|
* adp_ok no pending write, or write flushed completely
|
|
* adp_write_busy pending write not flushed completely
|
|
*/
|
|
AdpErrs DevSW_FlushPendingWrite(const DeviceDescr *device);
|
|
|
|
/*
|
|
* Function: DevSW_Ioctl
|
|
* Purpose: Perform miscellaneous control operations. This is a minimal
|
|
* veneer to DeviceIoctl.
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to control.
|
|
*
|
|
* opcode Reason code indicating the operation to perform.
|
|
*
|
|
* In/Out: args Pointer to opcode-sensitive arguments/result space.
|
|
*
|
|
* Returns:
|
|
* OK: adp_ok
|
|
* Error: adp_failed
|
|
*/
|
|
AdpErrs DevSW_Ioctl(const DeviceDescr *device, const int opcode, void *args);
|
|
|
|
/*
|
|
* Function: DevSW_WriteFinished
|
|
* Purpose: Return TRUE if the active device has finished writing
|
|
* the last packet to be sent, or FALSE if a packet is still
|
|
* being transmitted.
|
|
*
|
|
* Params:
|
|
* Input: device The device driver to check.
|
|
*
|
|
* Returns:
|
|
* TRUE: write finished or inactive
|
|
* FALSE: write in progress
|
|
*/
|
|
bool DevSW_WriteFinished(const DeviceDescr *device);
|
|
|
|
|
|
/*
|
|
* set filename and enable/disable logginf of ADP packets
|
|
*/
|
|
void DevSW_SetLogfile(const char *filename);
|
|
void DevSW_SetLogEnable(int logEnableFlag);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* ndef angsd_devsw_h */
|
|
|
|
/* EOF devsw.h */
|