GlorBrig at 9:14 Add a comment You must log in to answer this question. Interface_number = cfg. David at 8:47 I thought that if the problem was caused purely by 'software problems' and not 'hardware problems', reinstalling Ubuntu would renew the USB. Note: for simplicity I've hardcoded 0 as interface number for detach_kernel_driver and attach_kernel_driver - you should make it smarter, I suppose. Modern PCs support several such trees of USB. USB uses a tree structure, with the host as the root (the system’s master), hubs as interior nodes, and peripherals as leaves (and slaves). The function usbsetconfiguration () always fails from non-root user. A Universal Serial Bus (USB) is used to connect a host, such as a PC or workstation, to a number of peripheral devices. Log in to get rid of this advertisement I created a DS2490 driver in user space by using lusb (kernel 2.6.x) with RedHat R5, but it can only run from root. and two USB-UART chips(FT4232H) and two 4G model device and one ttyACM0 device are connected to the two usb2.0 hub. I just got this piece of code (based on your sample) working. Rep: usbsetconfiguration () failed from non-root user. In the board, two usb 2.0 hub(CY7C65640) are connected to the TX2. Some of them are returned by the Host Controller Drivers (HCDs), which device drivers only see through usbcore. I believe there's no need to call any of those C functions/Python methods if you can ensure that no kernel driver is loaded for a given device (or manually unload it before running your code). Revised 2004-Oct-21 This is the documentation of (hopefully) all possible error codes (and their interpretation) that can be returned from usbcore. When you're done, you may want to call attach_kernel_driver to re-attach the kernel driver again. So basically, you need to call detach_kernel_driver first to detach already attached kernel driver (if any) from the device's interface, so you can communicate with it in your code (it's either your code or some kernel driver talking to the device's interface). Linux USB gadget configured through configfs. ChipIdea Highspeed Dual Role Controller Driver. The Documentation/usb/error-codes.txt file describes the errors that this function can return: -EPIPE The pipe type specified in the URB doesn't match the endpoint's actual type. Authorizing (or not) your USB devices to connect to the system. Int libusb_attach_kernel_driver(libusb_device_handle *dev, 2 Answers Sorted by: 4 usbcontrolmsg () eventually calls down to usbsubmiturb (). detached using libusb_detach_kernel_driver(). Re-attach an interface's kernel driver, which was previously Int libusb_detach_kernel_driver (libusb_device_handle *dev, If successful, you will then be able to claim the interface and perform I/O. Assuming your using Linux and libusb-1.0 as a PyUSB's backend library.Īccording to the libusb documentation: // Detach a kernel driver from an interface.
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