Hi
> -----Original Message-----
> From: Baolin Wang [mailto:baolin.w...@linaro.org]
> Sent: Wednesday, April 06, 2016 7:31 PM
> To: Jun Li <jun...@nxp.com>
> Cc: ba...@kernel.org; gre...@linuxfoundation.org; s...@kernel.org;
> dbarysh...@gmail.com; dw...@infradead.org; peter.c...@freescale.com;
> st...@rowland.harvard.edu; r.bald...@samsung.com;
> yoshihiro.shimoda...@renesas.com; lee.jo...@linaro.org; broo...@kernel.org;
> ckee...@opensource.wolfsonmicro.com; patc...@opensource.wolfsonmicro.com;
> linux...@vger.kernel.org; linux-usb@vger.kernel.org; device-
> mainlin...@lists.linuxfoundation.org; linux-ker...@vger.kernel.org
> Subject: Re: [PATCH v9 1/4] gadget: Introduce the usb charger framework
>
> On 6 April 2016 at 16:26, Jun Li <jun...@nxp.com> wrote:
> > Hi
> >
> >> + */
> >> +static enum usb_charger_type
> >> +usb_charger_get_type_by_others(struct usb_charger *uchger) {
> >> + if (uchger->type != UNKNOWN_TYPE)
> >> + return uchger->type;
> >> +
> >> + if (uchger->psy) {
> >> + union power_supply_propval val;
> >> +
> >> + power_supply_get_property(uchger->psy,
> >> + POWER_SUPPLY_PROP_CHARGE_TYPE,
> >> + &val);
> >> + switch (val.intval) {
> >> + case POWER_SUPPLY_TYPE_USB:
> >> + uchger->type = SDP_TYPE;
> >> + break;
> >> + case POWER_SUPPLY_TYPE_USB_DCP:
> >> + uchger->type = DCP_TYPE;
> >> + break;
> >> + case POWER_SUPPLY_TYPE_USB_CDP:
> >> + uchger->type = CDP_TYPE;
> >> + break;
> >> + case POWER_SUPPLY_TYPE_USB_ACA:
> >> + uchger->type = ACA_TYPE;
> >> + break;
> >> + default:
> >> + uchger->type = UNKNOWN_TYPE;
> >> + break;
> >> + }
> >> + } else if (uchger->get_charger_type) {
> >> + uchger->type = uchger->get_charger_type(uchger);
> >> + } else {
> >> + uchger->type = UNKNOWN_TYPE;
> >> + }
> >> +
> >> + return uchger->type;
> >> +}
> >> +
> >
> > I think we may don't need this usb_charger_get_type_by_others().
> > "uchger->type" is set in one place is enough, that is: by
> > uchger->charger_detect() in usb_charger_detect_type(), then
> > usb_charger_get_type_by_others() is replaced by usb_charger_get_type().
> >
> > uchger->charger_detect() can have diff implementations no matter
> > what kind of mechanism is used, for your PMIC case, you can just
> > directly get the type value by power_supply_get_property(); with that,
> > we can have one central place to set uchger->type.
> > After uchger->type is set, charger type detection is no need to be
> > involved until charger type changes.
> >
> > Then next question is where is to call usb_charger_detect_type(), We
> > need make sure it finished before usb gadget connect.
>
> Yeah, that's the point: where? It is hard for usb charger framework to
> control, which will make it more complicated. The
> 'usb_charger_detect_type()' is used for detecting the charger type
> manually on user's platform, and user should call it at the right time to
> avoid affecting gadget enumeration. Otherwise user can implement some
> callbacks showed in 'usb_charger_get_type_by_others()' function to get
> charger type. I think this is controllable and simple for the usb charger
> framework.
As my suggested, Can this detection be in usb_udc_vbus_handler(), and
before usb_udc_connect_control()? We should be able to find some central
place where it is between vbus detection and gadget connect.
>
> >
> > Ideal is with your framework, diff users only need implement
> > uchger->charger_detect(). :)
> >
>
> --
> Baolin.wang
> Best Regards
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