linux-kernel - Re: [PATCH v12 2/4] gadget: Support for the usb charger framework

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Date:	Wed, 22 Jun 2016 09:45:55 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Felipe Balbi <balbi@...nel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>, robh@...nel.org,
	Jun Li <jun.li@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Ruslan Bilovol <ruslan.bilovol@...il.com>,
	Peter Chen <peter.chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
	grygorii.strashko@...com,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Lee Jones <lee.jones@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	patches@...nsource.wolfsonmicro.com,
	Linux PM list <linux-pm@...r.kernel.org>,
	USB <linux-usb@...r.kernel.org>,
	device-mainlining@...ts.linuxfoundation.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 2/4] gadget: Support for the usb charger framework

On 21 June 2016 at 20:53, Felipe Balbi <balbi@...nel.org> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@...aro.org> writes:
>>>>>>>>> Can't you just tie a charger to a UDC and avoid the charger class
>>>>>>>>> completely?
>>>>>>>>
>>>>>>>> Yeah, I also hope so. But we really want something to manage the
>>>>>>>> charger devices, do you have any good suggestion to avoid the 'class'
>>>>>>>> but also can manage the charger devices?
>>>>>>>
>>>>>>> manage in what way? It seems to me that they don't need to be real
>>>>>>> devices, just a handle as part of struct usb_gadget, no?
>>>>>>
>>>>>> Although charger device is not one real hardware device, we also use
>>>>>> one 'struct device' to describe it in charger.c file. So we should
>>>>>> manage the 'struct device' with one proper way.
>>>>>
>>>>> that's fine, but why do you think they need a struct device to start with?
>>>>
>>>> We can get/put usb charger and mange usb charger attributes with the
>>>> device model if we use a struct device.
>>>
>>> We already have that as part of struct usb_udc. Why don't you just
>>> create a subdirectory called charger which will hold all your
>>> charger-related attributes. That directory will only be created if a
>>> valid ->charger pointer exists.
>>
>> That means we can remove all the device and class things in charger.c
>> file, right? OK, I try to do that. Thanks.
>
> right. Keep your charger.c file, because to conditionally compile and
> link that to udc-core.ko, but remove all the class initialization and
> all of that extra code.

Make sense.

-- 
Baolin.wang
Best Regards