Re: How to Suspend/Resume a usb device
"Felipe Balbi" <[email protected]>
| Newsgroups | gmane.linux.usb.devel,gmane.comp.lib.libusb.devel.general |
|---|---|
| Message-ID | <[email protected]> |
On 7/9/07, Alan Stern <[email protected]> wrote: > On Mon, 9 Jul 2007, Felipe Balbi wrote: > > > Hello all, > > > > How could I suspend/resume a usb device using libusb? I saw there's a > > function for reseting the device but what about suspending/resuming > > it? > > There's no way to do it using libusb or usbfs. However you can suspend > or resume a usb device using sysfs. Starting with 2.6.22, you can do > > echo suspend >/sys/bus/usb/devices/.../power/level > > (fill in the device ID) to suspend the device. Replace the word > "suspend" with "on" to force the device on permanently (autosuspend > disabled), and use "auto" to return to normal operation. > > If you don't know the device ID but you do know its bus and device > numbers -- which would be the case if you're starting from libusb -- > I believe you can get the same result using the path: > > /sys/class/usb_device/usbdevB.D/device/power/level Thanks Alan, I'll try this one ;-) > > > And also, does EHCI (on recent linux-linus' git tree) support > > SINGLE_STEP_GET_DESCRIPTOR and SINGLE_STEP_SET_FEATURE ??? > > I don't recognize those terms. What do they refer to? You can check them at OTG Compliance Program, it's part of the necessary certification tests for usb hosts. I don't think those are otg specific but it could be. > > Alan Stern > > -- Best Regards, Felipe Balbi [email protected] ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel