Re: [PATCH V7 9/9] usb : Add usb port's power control attributes

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2012/7/7 2:14, Greg KH wrote:
> On Fri, Jul 06, 2012 at 02:14:00PM +0800, Lan Tianyu wrote:
> > Change since v5: Add usb_autopm_get/put_interface() around the port
> > power operations in the control attribute's callback to deal with
> > situation that control attribute is changed when the usb hub is suspended.
> >
> > Change since v4: Add clear PORT_POWER if power policy is "off" in the
> > hub_power_on(). Return -EIO if set/clear PORT_POWER fails in the store_port_power_control()
> >
> > This patch is to add two attributes for each usb hub ports to control port's power.
> > Control port's power through setting or clearing PORT_POWER feature.
> >
> > control has two options. "auto", "on" and "off"
> > "on" - port power must be on.
> > "off" - port power must be off.
> >
> > state reports usb port's power state
> > "on" - power on
> > "off" - power off
> > "error" - can't get power state
> >
> > Acked-by: Alan Stern<stern@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Lan Tianyu<tianyu.lan@xxxxxxxxx>
> > ---
> >   Documentation/ABI/testing/sysfs-bus-usb |   25 ++++++
> >   drivers/usb/core/hub.c                  |  133 ++++++++++++++++++++++++++++++-
> >   2 files changed, 157 insertions(+), 1 deletions(-)
> >
> > diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
> > index 6df4e6f..abe4ea4 100644
> > --- a/Documentation/ABI/testing/sysfs-bus-usb
> > +++ b/Documentation/ABI/testing/sysfs-bus-usb
> > @@ -208,3 +208,28 @@ Description:
> >   		such as ACPI. This file will read either "removable" or
> >   		"fixed" if the information is available, and "unknown"
> >   		otherwise.
> > +
> > +What:		/sys/bus/usb/devices/.../(hub interface)/portX/control
> > +Date:		June 2012
>
> It is no longer June 2012  :)
Oh. Sorry. Forgot to modify. Time is too quick. :)
Will update soon.

--
Best Regards
Tianyu Lan
linux kernel enabling team
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