libusb_wrapper.c
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#include "libusb_wrapper.h"
void usbinit(libusb_context **context_ptr) {
// libusb_context *context;
int statusInit = libusb_init(context_ptr);
if (statusInit != LIBUSB_SUCCESS) {
perror("libusb_init");
exit(-1);
}
}
void usbclose(libusb_context *context) { libusb_exit(context); }
void interfaceclaim(libusb_device_handle *handle,
struct libusb_interface *interface) {
const struct libusb_interface_descriptor *interface_desc =
&interface->altsetting[0]; // TODO enlever cette ligne, refactor
if (interface_desc->bInterfaceClass ==
LIBUSB_CLASS_VENDOR_SPEC) { // ON PEUT VERIFIER LA CLASS
printf("> vendor specific class\n");
int status =
libusb_claim_interface(handle, interface_desc->bInterfaceNumber);
if (status != 0) {
perror("libusb_claim_interface");
exit(-1);
}
}
}
void interfaceclose(libusb_device_handle *handle,
struct libusb_interface *interface) {
const struct libusb_interface_descriptor *interface_desc =
&interface->altsetting[0];
int status =
libusb_release_interface(handle, interface_desc->bInterfaceNumber);
if (status != 0) {
perror("libusb_release_interface");
exit(-1);
}
}
// Si le méchant noyau est passé avant vous :
void getFromKernel(libusb_device_handle *handle,
int interface) { // private method for now
if (libusb_kernel_driver_active(handle, interface)) {
int statusKDriver = libusb_detach_kernel_driver(handle, interface);
if (statusKDriver != LIBUSB_SUCCESS) {
perror("libusb_detach_kernel_driver");
exit(-1);
}
}
}
ssize_t getListDevices(libusb_context *context, libusb_device ***list_ptr) {
ssize_t count = libusb_get_device_list(context, list_ptr);
if (count < 0) {
perror("libusb_get_device_list");
exit(-1);
}
return count;
}
void *_enumerateDevices(libusb_context *context,
void (*func)(libusb_device *device)) {
libusb_device **list;
ssize_t count = getListDevices(context, &list);
ssize_t i = 0;
for (i = 0; i < count; i++) {
libusb_device *device = list[i];
func(device);
}
libusb_free_device_list(list, 1);
return NULL; // DBGONLY TEMP
}
// print readable string, not asked for tutoring
void _printConfig(libusb_device *device) { // private method
// Ouverture du périphérique
libusb_device_handle *handle;
int statusDevice = libusb_open(device, &handle);
if (statusDevice != LIBUSB_SUCCESS) {
perror("libusb_open");
// return; //exit(-1);
}
int MAXLEN_DESCRIPTOR_STRING = 200;
uint8_t desc_idx = 2;
// uint16_t langid = 16;
unsigned char data[200];
// TEST 16
for (desc_idx = 0; desc_idx < 16; desc_idx++) {
int statusAscii = libusb_get_string_descriptor_ascii(
handle, desc_idx, data, MAXLEN_DESCRIPTOR_STRING);
if (statusAscii == -9) // TEST seems to be LIBUSB_ERROR
break;
printf(" - Descriptor string : %s ; %i\n", data, statusAscii);
}
libusb_close(handle);
}
void _displayOneDevice(libusb_device *device) {
struct libusb_device_descriptor desc;
int status = libusb_get_device_descriptor(device, &desc);
if (status != LIBUSB_SUCCESS) {
printf("Cannot get device desc : %s\n",
libusb_error_name(status)); // DBGONLY
perror("libusb_open");
return;
}
uint8_t bus = libusb_get_bus_number(device);
uint8_t address = libusb_get_device_address(device);
printf("Device Found @ (Bus:Address) %d:%d\n", bus, address);
printf("Vendor ID 0x0%x\n", desc.idVendor);
printf("Product ID 0x0%x\n", desc.idProduct);
// displayDeviceEndpoints(device); //Not really work on Axel@Alptop
}
void displayDevices(libusb_context *context) {
_enumerateDevices(context, _displayOneDevice);
}
void _displayOneDeviceMore(libusb_device *device) {
_displayOneDevice(device);
_printConfig(device);
}
void displayDevicesMore(libusb_context *context) {
_enumerateDevices(context, _displayOneDeviceMore);
}
// get device from iteration (and not from not recommanded function :
// ugly using global vars ?? Cannot communicate between getFirstDeviceFromID and
// _getFirstDeviceFromID
int g_vid;
int g_pid;
libusb_device *g_device = NULL;
void _getFirstDeviceFromID(libusb_device *device) {
struct libusb_device_descriptor desc;
int status = libusb_get_device_descriptor(device, &desc);
if (status != LIBUSB_SUCCESS) {
printf("Cannot get device desc : %s\n",
libusb_error_name(status)); // DBGONLY
perror("libusb_open");
return;
}
if (desc.idVendor == g_vid && desc.idProduct == g_pid) {
g_device = device;
}
}
void getFirstDeviceFromID(libusb_context *context, int vid, int pid,
libusb_device **device) {
g_vid = vid; // pass parameters for enumeration
g_pid = pid; // idem
_enumerateDevices(context, _getFirstDeviceFromID);
*device = g_device; // get return from enumeration
}
// void getDevicesFromID(vid, pid) //return array
void displayDeviceEndpoints(libusb_device_handle *handle) {
// recover pointer from handle
libusb_device *device;
device = libusb_get_device(handle);
// lectures des configs => on prend la première configuration pour l'instant
/*int configuration = 0; // valueof("bConfigurationValue");
int statusConfig = libusb_set_configuration(handle, configuration);
if (statusConfig != LIBUSB_SUCCESS) {
perror("libusb_set_configuration");
return;
}*/
// 4.2 configuration du périph usb
struct libusb_config_descriptor *config;
int statusFetchConfig = libusb_get_active_config_descriptor(device, &config);
if (statusFetchConfig != LIBUSB_SUCCESS) {
perror("libusb_get_active_config_descriptor");
return;
}
// caractéristiques globales
printf("Config.bConfigurationValue : %d\n", config->bConfigurationValue);
printf("Config/ bLength:%d\nbDescriptorType:%d\nbNumInterfaces:%d\n",
config->bLength, config->bDescriptorType, config->bNumInterfaces);
// itération des interfaces
printf("Itération de l'interface\n");
for (int indexInterface = 0; indexInterface < config->bNumInterfaces;
indexInterface++) {
printf("-indexInterface=%d\n", indexInterface);
printf("-Altsetting=%d\n",
config->interface[indexInterface].num_altsetting);
const struct libusb_interface *interface =
&config->interface[indexInterface];
// if 1 setting (or more)
if (interface->num_altsetting != 0) {
const struct libusb_interface_descriptor *interface_desc =
&interface->altsetting[0];
printf("--bNumEndpoints=%d\n", interface_desc->bNumEndpoints);
printf("--bDescriptorType=%d\n", interface_desc->bDescriptorType);
for (int indexEndpoints = 0;
indexEndpoints < interface_desc->bNumEndpoints; indexEndpoints++) {
const struct libusb_endpoint_descriptor *endpoint_desc =
&interface_desc->endpoint[indexEndpoints];
printf("---bDescriptorType=%d\n", endpoint_desc->bDescriptorType);
printf("---bEndpointAddress=%d\n", endpoint_desc->bEndpointAddress);
if (endpoint_desc->extra != NULL)
printf("---extra: %s\n", endpoint_desc->extra);
if (endpoint_desc->bmAttributes ==
LIBUSB_TRANSFER_TYPE_INTERRUPT) // TODO AJOUT MASQUE ? (voir doc)
printf("---is of type INTERRUPT\n");
}
}
// Affichez l’indice et le numéro de chaque interface détectée et réclamée.
// Affichez aussi les points d’accès trouvés en précisant ceux sauvés.
/*
//int interface=valueof("bInterfaceNumber");
int
status=libusb_claim_interface(handle,interface->bInterfaceNumber);
if(status!=0){ perror("libusb_claim_interface"); exit(-1); }
status=libusb_release_interface(handle,interface->bInterfaceNumber);
if(status!=0){ perror("libusb_release_interface"); exit(-1); }
//claim_interface(.., config interface altsetting bInterfaceNumber
//config interface altsetting endpoint bmAttributes ==
LIBUSB_TRANSFER_TYPE_INTERRUPT
//add des enpoint unint8_t*/
// DESCRIPTOR.C /.H :décommenter
// IL FAUT RELEASE UNIQUEMENT LES INTERFACES QUI NE SONT PAS DES HID
}
printf("\n");
libusb_close(handle);
}
void getOurInterfaces(libusb_device *device,
struct libusb_interface **int_hidjoy,
struct libusb_interface **int_leds,
struct libusb_interface **int_vibrators) {
struct libusb_config_descriptor *config;
int statusFetchConfig = libusb_get_active_config_descriptor(device, &config);
if (statusFetchConfig != LIBUSB_SUCCESS) {
perror("libusb_get_active_config_descriptor");
return;
}
// itération des interfaces
for (int indexInterface = 0; indexInterface < config->bNumInterfaces;
indexInterface++) {
const struct libusb_interface *interface =
&config->interface[indexInterface];
// todo use le descriptor pour avoir bInterfaceNumber?
if (indexInterface == 0) {
*int_hidjoy = (struct libusb_interface *)interface;
} else if (indexInterface == 1) {
*int_leds = (struct libusb_interface *)interface;
} else if (indexInterface == 2) {
*int_vibrators = (struct libusb_interface *)interface;
}
//#define pour les indices correspondants aux interfaces
// variables globales
}
}
char getOnlyEndpoint(struct libusb_interface *interface) {
const struct libusb_interface_descriptor *interface_desc =
&interface->altsetting[0];
const struct libusb_endpoint_descriptor *endpoint_desc =
&interface_desc->endpoint[0];
if (endpoint_desc->bmAttributes !=
LIBUSB_TRANSFER_TYPE_INTERRUPT) // ON PEUT VERIFIER LE TRANSFER TYPE
printf("> is NOT of type INTERRUPT\n");
return (char)endpoint_desc->bEndpointAddress;
}