void openusb(usbdevice* kb){
// The driver sometimes isn't completely ready yet, so give it a short delay
sleep(1);
// Handle 3 is the control handle
kb->lastkeypress = -1;
kb->handle = kb->handles[3];
// Set up the device
int setup = setupusb(kb);
if(setup == -1){
closehandle(kb);
pthread_mutex_unlock(&kb->mutex);
pthread_mutex_destroy(&kb->mutex);
pthread_mutex_destroy(&kb->keymutex);
return;
} else if(setup){
// If the setup had a communication error, wait a bit and try again.
sleep(1);
resetusb(kb);
}
// Start handling HID reports for the Corsair input
IOHIDDeviceRegisterInputReportCallback(kb->handles[2], kb->intinput, MSG_SIZE, reportcallback, kb);
// Register for close notification
IOHIDDeviceRegisterRemovalCallback(kb->handle, usbremove, kb);
// Update connected
updateconnected();
notifyconnect(kb, 1);
int index = INDEX_OF(kb, keyboard);
printf("Device ready at %s%d\n", devpath, index);
pthread_mutex_unlock(&kb->mutex);
}
int usb_tryreset(usbdevice* kb){
if(reset_stop)
return -1;
ckb_info("Attempting reset...\n");
while(1){
int res = resetusb(kb);
if(!res){
ckb_info("Reset success\n");
return 0;
}
if(res == -2 || reset_stop)
break;
}
ckb_err("Reset failed. Disconnecting.\n");
return -1;
}
int openusb(struct udev_device* dev, int model){
// Make sure it's not connected yet
const char* path = udev_device_get_devnode(dev);
for(int i = 1; i < DEV_MAX; i++){
if(keyboard[i].udev && !strcmp(path, udev_device_get_devnode(keyboard[i].udev)))
return 0;
}
// Find a free USB slot
for(int index = 1; index < DEV_MAX; index++){
usbdevice* kb = keyboard + index;
if(!IS_ACTIVE(kb)){
// Open the sysfs device
kb->udev = dev;
kb->handle = open(path, O_RDWR);
kb->model = model;
if(kb->handle <= 0){
printf("Error: Failed to open USB device: %s\n", strerror(errno));
closehandle(kb);
connectstatus |= 2;
return -1;
}
// Copy device description and serial
strncpy(kb->name, udev_device_get_sysattr_value(dev, "product"), NAME_LEN);
strncpy(kb->setting.serial, udev_device_get_sysattr_value(dev, "serial"), SERIAL_LEN);
printf("Connecting %s (S/N: %s)\n", kb->name, kb->setting.serial);
// A USB reset is almost always required in order for it to work correctly
printf("Resetting device\n");
if(ioctl(kb->handle, USBDEVFS_RESET, 0)){
printf("Reset failed (%s). Disconnecting.\n", strerror(errno));
closehandle(kb);
connectstatus |= 2;
return -1;
}
// Claim the USB interfaces
if(usbclaim(kb)){
printf("Error: Failed to claim interface: %s\n", strerror(errno));
closehandle(kb);
connectstatus |= 2;
return -1;
}
// Put the M-keys (K95) as well as the Brightness/Lock keys into software-controlled mode. This packet disables their
// hardware-based functions.
unsigned char datapkt[MSG_SIZE] = { 0x07, 0x04, 0x02 };
struct usbdevfs_ctrltransfer transfer = { 0x21, 0x09, 0x0300, 0x03, MSG_SIZE, 500, datapkt };
// This packet doesn't always succeed, so reset the device if that happens
if(ioctl(kb->handle, USBDEVFS_CONTROL, &transfer) != MSG_SIZE){
printf("Couldn't talk to device (%s), trying to reset again...\n", strerror(errno));
if(resetusb(kb) || ioctl(kb->handle, USBDEVFS_CONTROL, &transfer) != MSG_SIZE){
printf("Reset failed (%s). Disconnecting.\n", strerror(errno));
closehandle(kb);
connectstatus |= 2;
return -1;
}
}
// Set up the device
if(setupusb(index)){
closehandle(kb);
connectstatus |= 2;
return -1;
}
// Set up the interrupt transfers.
kb->INPUT_TEST = 0;
setint(kb);
// We should receive an interrupt transfer shortly after setting them up. If it doesn't happen, the device
// isn't working correctly and needs to be reset
int received = 0;
for(int wait = 0; wait < 10; wait++){
usleep(50000);
if(kb->INPUT_TEST){
received = 1;
break;
}
}
if(!received){
printf("Didn't get input, trying to reset again...\n");
if(resetusb(kb)){
printf("Reset failed (%s). Disconnecting.\n", strerror(errno));
closehandle(kb);
connectstatus |= 2;
return -1;
}
}
updateconnected();
printf("Device ready at %s%d\n", devpath, index);
connectstatus |= 1;
return 0;
}
}
printf("Error: No free devices\n");
return -1;
}
