forked from vrpn/vrpn
/
vrpn_DevInput.C
241 lines (199 loc) · 6.82 KB
/
vrpn_DevInput.C
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/* file: vrpn_DevInput.cpp
* author: Mike Weiblen mew@mew.cx 2004-01-14
* copyright: (C) 2003,2004 Michael Weiblen
* license: Released to the Public Domain.
* depends: gpm 1.19.6, VRPN 06_04
* tested on: Linux w/ gcc 2.95.4
* references: http://mew.cx/ http://vrpn.org/
* http://linux.schottelius.org/gpm/
*/
#include "vrpn_DevInput.h"
VRPN_SUPPRESS_EMPTY_OBJECT_WARNING()
#ifdef VRPN_USE_DEV_INPUT
#include <sys/select.h> // for select, FD_ISSET, FD_SET, etc
#include <vrpn_Shared.h> // for vrpn_gettimeofday
#include <unistd.h> // for close, read
#include <utility> // for pair
#include <fcntl.h> // for open, O_RDONLY
#include <linux/input.h> // for input_event, ABS_MAX, etc
#include <errno.h> // for errno, EACCES, ENOENT
#include <string.h> // for strcmp, NULL, strerror
#include <sys/ioctl.h> // for ioctl
#include <iostream> // for operator<<, ostringstream, etc
#include <map> // for map, _Rb_tree_iterator, etc
#include <string> // for string, operator+, etc
#include <sstream>
#define REPORT_ERROR(msg) { send_text_message(msg, timestamp, vrpn_TEXT_ERROR); }
static const std::string &getDeviceNodes(const std::string &device_name) {
std::map<std::string, std::string> s_devicesNodes;
bool permission_missing = false;
unsigned int id = 0;
while (1) {
std::ostringstream oss;
oss << "/dev/input/event" << id;
int fd = open(oss.str().c_str(), O_RDONLY);
if(fd >= 0){
char name[512];
if(ioctl(fd, EVIOCGNAME(sizeof(name)), name) >= 0) {
s_devicesNodes[name] = oss.str();
}
close(fd);
} else {
if (errno == ENOENT) break;
if (errno == EACCES) permission_missing = true;
}
errno = 0;
id++;
}
if (permission_missing) {
std::cout << "vrpn_DevInput device scan warning : permission denied for some nodes !" << std::endl;
}
std::map<std::string, std::string>::iterator node_name = s_devicesNodes.find(device_name);
if (node_name != s_devicesNodes.end()) {
return node_name->second;
}
return "";
}
///////////////////////////////////////////////////////////////////////////
vrpn_DevInput::vrpn_DevInput( const char* name, vrpn_Connection * cxn, const char *device_name, const char * type, int int_param )
: vrpn_Analog( name, cxn )
, vrpn_Button_Filter( name, cxn )
, d_fileDescriptor(-1) // None found yet, device broken.
{
int i;
if (strcmp(type, "keyboard") == 0) {
d_type = DEVICE_KEYBOARD;
} else if (strcmp(type, "absolute") == 0) {
d_type = DEVICE_MOUSE_ABSOLUTE;
} else if (strcmp(type, "relative") == 0) {
d_type = DEVICE_MOUSE_RELATIVE;
} else {
REPORT_ERROR("Third parameter must be keyboard, absolute or relative");
return;
}
vrpn_Button_Filter::num_buttons = 0;
vrpn_Analog::num_channel = 0;
switch (d_type) {
case DEVICE_KEYBOARD:
if ((int_param < 1) || (int_param >= vrpn_BUTTON_MAX_BUTTONS)) {
REPORT_ERROR("In case of keyboard, the value must be between 1 and 256");
return;
}
vrpn_Button_Filter::num_buttons = int_param;
break;
case DEVICE_MOUSE_ABSOLUTE:
vrpn_Analog::num_channel = REL_MAX;
vrpn_Button_Filter::num_buttons = 0x50;
d_absolute_min = 0;
d_absolute_range = int_param;
break;
case DEVICE_MOUSE_RELATIVE:
vrpn_Analog::num_channel = ABS_MAX;
vrpn_Button_Filter::num_buttons = 0x50;
break;
};
// initialize the vrpn_Analog
for( i = 0; i < vrpn_Analog::num_channel; i++) {
vrpn_Analog::channel[i] = vrpn_Analog::last[i] = 0;
}
// initialize the vrpn_Button_Filter
for( i = 0; i < vrpn_Button_Filter::num_buttons; i++) {
vrpn_Button_Filter::buttons[i] = vrpn_Button_Filter::lastbuttons[i] = 0;
}
std::string node = getDeviceNodes(device_name);
if (node.length() == 0) {
char msg[4096];
sprintf(msg, "vrpn_DevInput::vrpn_DevInput(): Could not get device %s",
device_name);
REPORT_ERROR(msg);
return;
}
d_fileDescriptor = open(node.c_str(), O_RDONLY);
if(d_fileDescriptor < 0){
char msg[4096];
sprintf(msg, "vrpn_DevInput::vrpn_DevInput(): Could not open device %s (%s)",
device_name, strerror(errno));
REPORT_ERROR(msg);
return;
}
}
///////////////////////////////////////////////////////////////////////////
vrpn_DevInput::~vrpn_DevInput()
{
if (d_fileDescriptor >= 0) {
close(d_fileDescriptor);
}
d_fileDescriptor = -1;
}
///////////////////////////////////////////////////////////////////////////
void vrpn_DevInput::mainloop()
{
get_report();
server_mainloop();
report_changes();
}
///////////////////////////////////////////////////////////////////////////
int vrpn_DevInput::get_report()
{
fd_set readset;
if (d_fileDescriptor < 0) {
return 0;
}
FD_ZERO( &readset );
FD_SET( d_fileDescriptor, &readset );
struct timeval timeout = { 0, 0 };
select( d_fileDescriptor+1, &readset, NULL, NULL, &timeout );
vrpn_gettimeofday( ×tamp, NULL );
if( ! FD_ISSET( d_fileDescriptor, &readset ) )
return 0;
struct input_event event;
if (read(d_fileDescriptor, &event, sizeof(event)) < sizeof(event)) {
return 0;
}
switch (event.type) {
case EV_KEY: {
int button_number = event.code;
if ((d_type == DEVICE_MOUSE_RELATIVE) || (d_type == DEVICE_MOUSE_ABSOLUTE)) {
button_number -= BTN_MOUSE;
}
if ((button_number >= 0) && (button_number < vrpn_Button_Filter::num_buttons)) {
buttons[button_number] = event.value;
}
} break;
case EV_REL: {
int channel_number = event.code;
if ((channel_number >= 0) && (channel_number < vrpn_Analog::num_channel)) {
for (unsigned int i = 0 ; i < vrpn_Analog::num_channel ; i++) {
vrpn_Analog::last[i] = 0;
}
vrpn_Analog::channel[channel_number] = (vrpn_float64)event.value;
}
} break;
case EV_ABS:
int channel_number = event.code;
if ((channel_number >= 0) && (channel_number < vrpn_Analog::num_channel)) {
vrpn_float64 value = ((vrpn_float64)event.value - d_absolute_min) / d_absolute_range;
vrpn_Analog::channel[channel_number] = value;
}
break;
};
return 1;
}
///////////////////////////////////////////////////////////////////////////
void vrpn_DevInput::report_changes( vrpn_uint32 class_of_service )
{
vrpn_Analog::timestamp = timestamp;
vrpn_Button_Filter::timestamp = timestamp;
vrpn_Analog::report_changes( class_of_service );
vrpn_Button_Filter::report_changes();
}
///////////////////////////////////////////////////////////////////////////
void vrpn_DevInput::report( vrpn_uint32 class_of_service )
{
vrpn_Analog::timestamp = timestamp;
vrpn_Button_Filter::timestamp = timestamp;
vrpn_Analog::report( class_of_service );
vrpn_Button_Filter::report_changes();
}
#endif
/*EOF*/