Utility to Suspend/Disable/Enable Power Off USB ports

[Anish Mistry]

On Thursday 06 March 2008, Hans Petter Selasky wrote:
> Hi,
>
> I think that we should have this functionality in the USB kernel
> like a separate IOCTL, that only takes an USB address like
> argument, hence every USB device in the kernel knows which is its
> parent HUB.
Yes, this would be ideal.

> There is a problem when you do a port reset, and that is that the
> USB device goes into the unaddressed state, and starts responding
> to address 0. If another device is being enumerated at the same
> time, this might cause problems.
Hmmm...Any suggestions?

>
> BTW: What are the main purposes of your program?
To shutoff a USB device so that it knows to stop.  See my email 
earlier to the list entitled "Suspend/Sleep/Stop USB device".
Basically my built-in camera was getting hot and drawing power.  I 
needed a way to shut it down as not to waste power.

>
> --HPS
>
> On Wednesday 05 March 2008, Anish Mistry wrote:
> > I've written the upower utility allows you to selectively suspend
> > usb ports.  It acts similar to the Windows "Stop Removable
> > Device" process.  It has only been tested on 7.0-RELEASE.
> >
> > WARNING: This program may eat your lunch and kick your dog. 
> > You've been warned.
> >
> > Download and compile.
> >
> > fetch http://am-productions.biz/docs/upower.c
> > gcc -o upower upower.c
> >
> > You will need to be root or have rw access to the uhub devices.
> > eg. /dev/usbX
> >
> > Use "usbdevs -v" to find the port/device to suspend.
> > # usbdevs -v
> > Controller /dev/usb0:
> > addr 1: full speed, self powered, config 1, UHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> > Controller /dev/usb1:
> > addr 1: full speed, self powered, config 1, UHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 addr 2: low speed, power 100 mA, config 1, product 0x0009
> > (0x0009), vendor 0x045e(0x045e), rev 1.05
> > Controller /dev/usb2:
> > addr 1: full speed, self powered, config 1, UHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 addr 2: full speed, power 100 mA, config 1, Fingerprint
> > Sensor(0x2580), vendor 0x08ff(0x08ff), rev 6.23
> > Controller /dev/usb3:
> > addr 1: full speed, self powered, config 1, UHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> > Controller /dev/usb4:
> > addr 1: high speed, self powered, config 1, EHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> >  port 3 addr 2: high speed, self powered, config 1, product
> > 0x005a(0x005a), vendor 0x0409(0x0409), rev 1.00
> >   port 1 powered
> >   port 2 powered
> >   port 3 powered
> >   port 4 powered
> >  port 4 powered
> > Controller /dev/usb5:
> > addr 1: high speed, self powered, config 1, EHCI root
> > hub(0x0000), Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> >  port 3 powered
> >  port 4 addr 2: high speed, power 320 mA, config 1, Sirius USB2.0
> > Camera(0x3343), Vimicro Corp.(0x0ac8), rev 1.00
> >
> >
> > Since my built-in USB camera draws power when not in use, I'll
> > suspend it to save battery time.
> >
> > # ./upower /dev/usb5 4 suspend



-- 
Anish Mistry
amistry at am-productions.biz
AM Productions http://am-productions.biz/
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