linux-kernel - Re: usb: musb: "(null)" in sysfs mode file after disabling a gadget (and at other times, system hangs)

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Date:   Fri, 2 Mar 2018 17:54:39 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Merlijn Wajer <merlijn@...zup.org>
Cc:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        linux-omap@...r.kernel.org
Subject: Re: usb: musb: "(null)" in sysfs mode file after disabling a gadget
 (and at other times, system hangs)

On Friday 02 March 2018 17:47:52 Merlijn Wajer wrote:
> >> I would expect it to state "b_idle" instead of "(null)".
> > 
> > Actually, I'd like to see (null) whenever a gadget driver is not loaded,
> > which indicates a gadget is not bound to the udc.
> 
> Hm... Sounds fine to me. I'm using this mode in combination with the usb
> phy (vbus property) to detect if the phone is detect to a 'dumb' charger
> of a PC, but I can just always have a gadget loaded -- same as before,
> really.

For detection if wallcharger or pc usb charger is connected, there is
isp1704_charger driver. It uses some standard ULPI interface. It reports
current_max and type (DCP - dedicated, CDP or just usb).

-- 
Pali Rohár
pali.rohar@...il.com

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