Please use Reply-To-All so that your message goes to the mailing list as well as to me. On Fri, Dec 15, 2023 at 05:17:02PM -0600, Yinghua Yang Yang wrote: > I would prefer an easier way too. On a linux platform where udev is > supported, a udev rule can be used to set the power/control flag. But on > the platform I am using, the udev is not available and I don't have root > access. Do you have any suggestions? I can't really suggest anything without knowing more about your userspace environment. It's very unusual to be in a situation where you are allowed to modify the kernel by adding a new driver but you aren't allowed to modify the userspace by adding a new shell script! Alan Stern > On Fri, Dec 15, 2023 at 4:46 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > wrote: > > > On Fri, Dec 15, 2023 at 03:12:10PM -0600, Yinghua Yang wrote: > > > New USB driver that sets power/control to autosuspend for Motorola > > > Solutions security accessories. The new driver only changes the power > > > control for specific USB devices, normal read/write/ioctl of the usb > > > device uses the unmodified usbfs. > > > > > > The rationale for a vendor specific driver was to allow for autosuspend > > > behavior on Linux installations that are battery powered and do not > > > allow user modifications to udev settings (e.g. embedded Linux, Android, > > > etc.). The idealistic generic approach that would allow any USB device > > > that supports autosuspend to change the power control could not be found > > > without a change to the USB standard or substantial change to the usbfs > > > architecture. > > > > > > Signed-off-by: Yinghua Yang <Yinghua.Yang@xxxxxxxxxxxxxxxxxxxxx> > > > --- > > > > It seems silly to write a kernel driver for this. Isn't there any way > > to handle it in userspace? All you would need is a simple shell > > script. > > > > Alan Stern > > > > -- > > > *For more information on how and why we collect your personal > information, please visit our Privacy Policy > <https://www.motorolasolutions.com/en_us/about/privacy-policy.html?elqTrackId=8980d888905940e39a2613a7a3dcb0a7&elqaid=2786&elqat=2#privacystatement>.*
