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