linux-kernel - Re: [PATCH v9 1/4] gadget: Introduce the usb charger framework

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Date:	Tue, 5 Apr 2016 17:41:44 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Peter Chen <hzpeterchen@...il.com>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Peter Chen <peter.chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.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 v9 1/4] gadget: Introduce the usb charger framework

On 5 April 2016 at 15:56, Peter Chen <hzpeterchen@...il.com> wrote:
> On Fri, Apr 01, 2016 at 03:21:49PM +0800, Baolin Wang wrote:
>> +
>> +int devm_usb_charger_register(struct device *dev,
>> +                           struct usb_charger *uchger)
>> +{
>> +     struct usb_charger **ptr;
>> +     int ret;
>> +
>> +     ptr = devres_alloc(devm_uchger_dev_unreg, sizeof(*ptr), GFP_KERNEL);
>> +     if (!ptr)
>> +             return -ENOMEM;
>> +
>> +     ret = usb_charger_register(dev, uchger);
>> +     if (ret) {
>> +             devres_free(ptr);
>> +             return ret;
>> +     }
>> +
>> +     *ptr = uchger;
>> +     devres_add(dev, ptr);
>> +
>> +     return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_usb_charger_register);
>
> When the above API is expected to call? Can we use the USB charger
> without USB gadget?

I think this is open for user to do their specific initialization for
usb charger. That depends on how to initialize your usb charger
structure.

>
>> +
>> +int usb_charger_init(struct usb_gadget *ugadget)
>> +{
>> +     struct usb_charger *uchger;
>> +     struct extcon_dev *edev;
>> +     struct power_supply *psy;
>> +     int ret;
>> +
>> +     uchger = kzalloc(sizeof(struct usb_charger), GFP_KERNEL);
>> +     if (!uchger)
>> +             return -ENOMEM;
>> +
>> +     uchger->type = UNKNOWN_TYPE;
>> +     uchger->state = USB_CHARGER_DEFAULT;
>> +     uchger->id = -1;
>> +
>> +     if (ugadget->speed >= USB_SPEED_SUPER)
>> +             uchger->cur_limit.sdp_cur_limit = DEFAULT_SDP_CUR_LIMIT_SS;
>> +     else
>> +             uchger->cur_limit.sdp_cur_limit = DEFAULT_SDP_CUR_LIMIT;
>
> We still haven't known bus speed here, it is better do it after
> setting configuration has finished.

OK. Make sense.

-- 
Baolin.wang
Best Regards