diff options
| -rw-r--r-- | examples/custom-class/commandline/set-led.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/examples/custom-class/commandline/set-led.c b/examples/custom-class/commandline/set-led.c index 739792b..75e77e4 100644 --- a/examples/custom-class/commandline/set-led.c +++ b/examples/custom-class/commandline/set-led.c @@ -60,8 +60,27 @@ int cnt, vid, pid, isOn; exit(1); } /* Since we use only control endpoint 0, we don't need to choose a - * configuration and interface. - */ + * configuration and interface. Reading device descriptor and setting a + * configuration and interface is done through endpoint 0 after all. + * However, newer versions of Linux require that we claim an interface + * even for endpoint 0. Enable the following code if your operating system + * needs it: */ +#if 0 + int retries = 1, usbConfiguration = 1, usbInterface = 0; + if(usb_set_configuration(handle, usbConfiguration) && showWarnings){ + fprintf(stderr, "Warning: could not set configuration: %s\n", usb_strerror()); + } + /* now try to claim the interface and detach the kernel HID driver on + * Linux and other operating systems which support the call. */ + while((len = usb_claim_interface(handle, usbInterface)) != 0 && retries-- > 0){ +#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP + if(usb_detach_kernel_driver_np(handle, 0) < 0 && showWarnings){ + fprintf(stderr, "Warning: could not detach kernel driver: %s\n", usb_strerror()); + } +#endif + } +#endif + if(strcasecmp(argv[1], "status") == 0){ cnt = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, CUSTOM_RQ_GET_STATUS, 0, 0, buffer, sizeof(buffer), 5000); if(cnt < 1){ |