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
> 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?
Alan Stern
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