main.c
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#include <stdio.h>
#include <stdbool.h>
#include <libusb-1.0/libusb.h>
#define VENDOR_ID 0xfccf
#define PRODUCT_ID 0xa001
bool initUI(void)
{
int ret;
libusb_device_handle* screenHandle;
ret = libusb_init(NULL);
if(ret != 0)
{
printf("Error while initializing libusb, return : %d\n", ret);
return false;
}
struct libusb_config_descriptor* dConfig = NULL;
libusb_device** list = NULL;
ssize_t cnt = libusb_get_device_list(NULL, &list);
struct libusb_device_descriptor dDevice;
printf("Starting lsusb things\n");
if(cnt < 0)
{
printf("Unable to get USB device list\n");
return false;
}
printf("%d devices detected\n", cnt);
printf("List of compatible devices detected\n");
for (int i = 0; i < cnt; i++)
{
libusb_device *device = list[i];
ret = libusb_get_device_descriptor(device, &dDevice);
if(VENDOR_ID == dDevice.idVendor && PRODUCT_ID == dDevice.idProduct)
{
printf("Bus %03d Device %03d: ID %04x:%04x\n",
libusb_get_bus_number(device),
libusb_get_device_address(device), dDevice.idVendor,
dDevice.idProduct);
ret = libusb_open(device, &screenHandle);
if(ret != 0)
{
printf("Unable to open this device, error %d\n", ret);
return false;
}
}
}
libusb_free_device_list(list, 1);
ret = libusb_get_config_descriptor(libusb_get_device(screenHandle), 0, &dConfig);
if(ret!=0)
{
printf("Descriptor for this device unavailable\n");
return false;
}
else
{
for(int j=0; j<dConfig->bNumInterfaces; j++)
{
if(libusb_kernel_driver_active(screenHandle, j) && (libusb_detach_kernel_driver(screenHandle, j) != 0))
{
printf("Unable to detach this device\n");
return false;
}
}
ret = libusb_set_configuration(screenHandle, dConfig->bConfigurationValue);
if(ret != 0)
{
printf("Configuration unavailable, error %d\n", ret);
return false;
}
for(int j=0; j<dConfig->bNumInterfaces; j++)
if(libusb_claim_interface(screenHandle, j) != 0)
{
printf("Device not claimed\n");
return false;
}
else
printf("Interface %d ready\n", j);
}
libusb_free_config_descriptor(dConfig);
return true;
}
int main(void)
{
if(!initUI())
printf("Unable to initialize the UI\n");
return 0;
}