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/*
powermate.cc
Ben Loftis
Created: 03/26/07 20:07:56
*/
#include <linux/input.h>
#include <cstring>
#include <cerrno>
#include <cstdio>
#include <unistd.h>
#include <fcntl.h>
#include <glibmm.h>
#include "pbd/pthread_utils.h"
#include "pbd/xml++.h"
#include "pbd/error.h"
#include "powermate.h"
#include "i18n.h"
using namespace ARDOUR;
using namespace std;
using namespace sigc;
using namespace PBD;
#define NUM_VALID_PREFIXES 2
static const char *valid_prefix[NUM_VALID_PREFIXES] = {
"Griffin PowerMate",
"Griffin SoundKnob"
};
#define NUM_EVENT_DEVICES 16
int open_powermate (const char *dev, int mode)
{
if (!Glib::file_test (dev, Glib::FILE_TEST_EXISTS)) {
return -1;
}
int fd = open(dev, mode);
int i;
char name[255];
if (fd < 0) {
if (errno != EACCES) {
error << string_compose ("Unable to open \"%1\": %2", dev, strerror(errno)) << endmsg;
}
return -1;
}
/* placate valgrind */
name[0] = '\0';
if (ioctl (fd, EVIOCGNAME (sizeof(name)), name) < 0) {
error << string_compose ("\"%1\": EVIOCGNAME failed: %2", dev, strerror(errno)) << endmsg;
close (fd);
return -1;
}
// it's the correct device if the prefix matches what we expect it to be:
for (i = 0; i < NUM_VALID_PREFIXES; ++i) {
if (!strncasecmp (name, valid_prefix[i], strlen (valid_prefix[i]))) {
return fd;
}
}
close (fd);
return -1;
}
int find_powermate(int mode)
{
char devname[256];
int i, r;
for (i = 0; i < NUM_EVENT_DEVICES; i++) {
sprintf (devname, "/dev/input/event%d", i);
r = open_powermate (devname, mode);
if (r >= 0) {
return r;
}
}
return -1;
}
PowermateControlProtocol::PowermateControlProtocol (Session& s)
: ControlProtocol (s, "powermate")
{
}
PowermateControlProtocol::~PowermateControlProtocol ()
{
set_active (false);
}
bool
PowermateControlProtocol::probe ()
{
int port = find_powermate( O_RDONLY );
if (port < 0) {
if (errno == ENOENT) {
info << "Powermate device not found; perhaps you have no powermate connected" << endmsg;
} else {
printf ("powermate: Opening of powermate failed - %s\n", strerror(errno));
}
return false;
}
close (port);
return true;
}
int
PowermateControlProtocol::set_active (bool inActivate)
{
if (inActivate != _active) {
if (inActivate) {
mPort = find_powermate(O_RDONLY);
if ( mPort < 0 ) {
return -1;
}
if (pthread_create_and_store ("Powermate", &mThread, 0, SerialThreadEntry, this) == 0) {
_active = true;
} else {
return -1;
}
printf("Powermate Control Protocol activated\n");
} else {
pthread_cancel (mThread);
close (mPort);
_active = false;
printf("Powermate Control Protocol deactivated\n");
}
}
return 0;
}
XMLNode&
PowermateControlProtocol::get_state ()
{
XMLNode* node = new XMLNode (X_("Protocol"));
node->add_property (X_("name"), _name);
return *node;
}
int
PowermateControlProtocol::set_state (const XMLNode& /*node*/, int /*version*/)
{
return 0;
}
void*
PowermateControlProtocol::SerialThreadEntry (void* arg)
{
static_cast<PowermateControlProtocol*>(arg)->register_thread ("Powermate");
return static_cast<PowermateControlProtocol*>(arg)->SerialThread ();
}
#define BUFFER_SIZE 32
bool held = false;
bool skippingMarkers = false;
void
PowermateControlProtocol::ProcessEvent(struct input_event *ev)
{
#ifdef VERBOSE
fprintf(stderr, "type=0x%04x, code=0x%04x, value=%d\n",
ev->type, ev->code, (int)ev->value);
#endif
switch(ev->type){
case EV_MSC:
printf("The LED pulse settings were changed; code=0x%04x, value=0x%08x\n", ev->code, ev->value);
break;
case EV_REL:
if(ev->code != REL_DIAL)
fprintf(stderr, "Warning: unexpected rotation event; ev->code = 0x%04x\n", ev->code);
else{
if (held) {
//click and hold to skip forward and back by markers
skippingMarkers = true;;
if (ev->value > 0)
next_marker();
else
prev_marker();
} else {
//scale the range so that we can go from +/-8x within 180 degrees, with less precision at the higher speeds
float speed = get_transport_speed();
speed += (float)ev->value * 0.05;
if (speed > 1.5 || speed < -1.5 )
speed += ev->value;
set_transport_speed( speed );
}
}
break;
case EV_KEY:
if(ev->code != BTN_0)
fprintf(stderr, "Warning: unexpected key event; ev->code = 0x%04x\n", ev->code);
else
if (ev->value)
held = true;
else {
held = false;
if (skippingMarkers) {
skippingMarkers = false;
} else {
if (get_transport_speed() == 0.0) {
set_transport_speed(1.0);
} else {
set_transport_speed(0.0);
}
}
}
break;
}
fflush(stdout);
}
void*
PowermateControlProtocol::SerialThread ()
{
struct input_event ibuffer[BUFFER_SIZE];
int r, events, i;
while(1){
r = read(mPort, ibuffer, sizeof(struct input_event) * BUFFER_SIZE);
if( r > 0 ){
events = r / sizeof(struct input_event);
for(i=0; i<events; i++)
ProcessEvent(&ibuffer[i]);
}else{
fprintf(stderr, "read() failed: %s\n", strerror(errno));
return (void*) 0;
}
}
return (void*) 0;
}
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