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/*
* Copyright (C) 2006 Paul Davis
* Copyright (C) 2007 Michael Taht
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* */
#if HAVE_TRANZPORT_KERNEL_DRIVER
#include <fcntl.h>
#include <errno.h>
#include <poll.h>
#include "tranzport_control_protocol.h"
// Something like open(/dev/surface/tranzport/event) for reading and raw for writing) would be better in the long run
// Also support for multiple tranzports needs to be figured out
// And bulk reads/writes in general
bool
TranzportControlProtocol::probe ()
{
if((udev = ::open(TRANZPORT_DEVICE,O_RDWR))> 0) {
::close(udev);
return true;
}
error << _("Tranzport: Can't open device for Read/Write: ") << endmsg;
return false;
}
int
TranzportControlProtocol::open ()
{
if((udev=::open(TRANZPORT_DEVICE,O_RDWR))> 0) {
return(udev);
}
error << _("Tranzport: no device detected") << endmsg;
return udev;
}
int
TranzportControlProtocol::close ()
{
int ret = 0;
if (udev < 1) {
return 0;
}
if ((ret = ::close (udev)) != 0) {
error << _("Tranzport: cannot close device") << endmsg;
}
return ret;
}
// someday do buffered reads, presently this does blocking reads, which is bad...
int TranzportControlProtocol::read(uint8_t *buf, uint32_t timeout_override)
{
last_read_error = ::read (udev, (char *) buf, 8);
switch(errno) {
case -ENOENT:
case -ENXIO:
case -ECONNRESET:
case -ESHUTDOWN:
case -ENODEV:
cerr << "Tranzport disconnected, errno: " << last_read_error;
set_active(false);
break;
case -ETIMEDOUT: // This is not normal, but lets see what happened
cerr << "Tranzport read timed out, errno: " << last_read_error;
break;
default:
#if DEBUG_TRANZPORT
cerr << "Got an unknown error on read:" << last_read_error "\n";
#endif
break;
}
return last_read_error;
}
int
TranzportControlProtocol::write_noretry (uint8_t* cmd, uint32_t timeout_override)
{
// inflight is now taken care of by the driver, but...
if(inflight > MAX_TRANZPORT_INFLIGHT) { return (-1); }
int val = ::write (udev, (char*) cmd, 8);
if (val < 0 && val !=8) {
#if DEBUG_TRANZPORT
printf("write failed: %d\n", val);
#endif
last_write_error = errno;
switch(last_write_error) {
case -ENOENT:
case -ENXIO:
case -ECONNRESET:
case -ESHUTDOWN:
case -ENODEV:
cerr << "Tranzport disconnected, errno: " << last_write_error;
set_active(false);
break;
case -ETIMEDOUT: // This is not normal but
cerr << "Tranzport disconnected, errno: " << last_write_error;
break;
default:
#if DEBUG_TRANZPORT
cerr << "Got an unknown error on read:" << last_write_error "\n";
#endif
break;
}
return last_write_error;
}
last_write_error = 0;
++inflight;
return 0;
}
int
TranzportControlProtocol::write (uint8_t* cmd, uint32_t timeout_override)
{
return (write_noretry(cmd,timeout_override));
}
// FIXME - install poll semantics
#endif /* HAVE_TRANZPORT_KERNEL_DRIVER */
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