uvc camera control flash led control linux

(first paragraph with device powered on, second one with same device powered off but still pluged in) T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 4 Spd=1.5 MxCh= 0ĭ: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 Or 'Manufacturer' and 'Product' (all these values are constant per device). Read relevant paragraph of '/proc/bus/usb/devices' according to your devices 'Vendor' (vendor id) and 'ProdID' (product id) This is an example with a Logitech USB wireless mouse under linux. This is particularly useful for embedded devices, such as a UVC webcams, which never seem to function properly and would otherwise require a system reboot to reset. I'm guessing at a lower layer this is interacting with the EHCI host controller to actually shut power off on the port.

I haven't hooked up a protocol analyzer to see what's actually happening on the bus, but I know my mouse light turns off when I unbind it. Finally, cycle the port power: echo '2-1.1.1'|sudo tee /sys/bus/usb/drivers/usb/unbindĮcho '2-1.1.1'|sudo tee /sys/bus/usb/drivers/usb/bind |_ Port 1: Dev 6, If 0, Class=HID, Driver=usbhid, 1.5M |_ Port 1: Dev 3, If 0, Class=hub, Driver=hub/3p, 480M |_ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M The syntax seems to be '.port.' For example, my mouse is connected to an external hub which connects to my computer's hub which internally connects to a root hub: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M

Locate the device in the bus / hub port hierarchy using the bus and device number: sudo lsusb -t|less Search for the bus and device number: sudo lsusb -v|less So, here's how I cycle hub port power on Ubuntu Oneiric Ocelot from a Bash shell. The usbfs interaction seems to have changed a number of times since this question was originally answered.

Uvc camera control flash led control linux