linux-kernel - Re: [PATCH v3] usb: core: introduce per-port over-current counters

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Message-ID: <20180320083405.GA23588@kroah.com>
Date:   Tue, 20 Mar 2018 09:34:05 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Richard Leitner <dev@...l1n.net>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stern@...land.harvard.edu, linux@...ck-us.net,
        mathias.nyman@...ux.intel.com, johan@...nel.org,
        felipe.balbi@...ux.intel.com, ekorenevsky@...il.com,
        peter.chen@....com, drake@...lessm.com, joe@...ches.com,
        Richard Leitner <richard.leitner@...data.com>
Subject: Re: [PATCH v3] usb: core: introduce per-port over-current counters

On Wed, Mar 14, 2018 at 10:51:09AM +0100, Richard Leitner wrote:
> From: Richard Leitner <richard.leitner@...data.com>
> 
> For some userspace applications information on the number of
> over-current conditions at specific USB hub ports is relevant.
> 
> In our case we have a series of USB hardware (using the cp210x driver)
> which communicates using a proprietary protocol. These devices sometimes
> trigger an over-current situation on some hubs. In case of such an
> over-current situation the USB devices offer an interface for reducing
> the max used power. As these conditions are quite rare and imply
> performance reductions of the device we don't want to reduce the max
> power always.
> 
> Therefore give user-space applications the possibility to react
> adequately by introducing an over_current_counter in the usb port struct
> which is exported via sysfs.
> 
> Signed-off-by: Richard Leitner <richard.leitner@...data.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-usb | 10 ++++++++++
>  drivers/usb/core/hub.c                  |  4 +++-
>  drivers/usb/core/hub.h                  |  1 +
>  drivers/usb/core/port.c                 | 10 ++++++++++
>  4 files changed, 24 insertions(+), 1 deletion(-)

What changed from the previous versions?  Always include that below the
--- line so we have an idea of what is going on here.

v4?

thanks,

greg k-h