43、设备驱动开发全解析：从用户空间到更多设备类型

设备驱动开发全解析：从用户空间到更多设备类型

1. 用户空间驱动开发

1.1 USB 设备驱动示例

以下是一个 USB 设备驱动的示例代码，它展示了如何使用 libusb 库来操作 USB 设备：

int main(int argc, char *argv[])
{
  struct usb_dev_handle *mydevice_handle;
  struct usb_bus *usb_bus;
  struct usb_device *mydevice;
  /* Initialize libusb */
  usb_init();
  usb_find_buses();
  usb_find_devices();
  /* Walk the bus */
  for (usb_bus = usb_buses; usb_bus; usb_bus = usb_bus->next) {
    for (mydevice = usb_bus->devices; mydevice; 
         mydevice = mydevice->next) {
      if ((mydevice->descriptor.idVendor == DIGICAM_VENDOR_ID) &&
       (mydevice->descriptor.idProduct == DIGICAM_PRODUCT_ID)) {

        /* Open the device */
        mydevice_handle = usb_open(mydevice);