pspusb.h
int sceUsbStart(const char* driverName, int unknown1, int unknown2);
int sceUsbStop(const char* driverName, int unknown1, int unknown2);
int sceUsbActivate(u32 flag);
int sceUsbDeactivate();
int sceUsbGetState(void);
int sceUsbGetDrvState(const char* driverName);
int sceUsbGetDrvList(u32 r4one, u32* r5ret, u32 r6one);
int sceUsbWaitState(?);
int sceUsbWaitCancel(void);