linux-kernel - Re: [PATCH v10 06/14] usb: gadget.h: Add OTG to gadget interface

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Date:	Mon, 20 Jun 2016 10:28:48 +0300
From:	Roger Quadros <rogerq@...com>
To:	Felipe Balbi <balbi@...nel.org>, <peter.chen@...escale.com>
CC:	<tony@...mide.com>, <gregkh@...uxfoundation.org>,
	<dan.j.williams@...el.com>, <mathias.nyman@...ux.intel.com>,
	<Joao.Pinto@...opsys.com>, <sergei.shtylyov@...entembedded.com>,
	<jun.li@...escale.com>, <grygorii.strashko@...com>,
	<yoshihiro.shimoda.uh@...esas.com>, <robh@...nel.org>,
	<nsekhar@...com>, <b-liu@...com>, <joe@...ches.com>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v10 06/14] usb: gadget.h: Add OTG to gadget interface

On 20/06/16 10:21, Felipe Balbi wrote:
> 
> Hi,
> 
> Roger Quadros <rogerq@...com> writes:
>> The OTG core will use struct otg_gadget_ops to
>> start/stop the gadget controller.
>>
>> The main purpose of this interface is to avoid directly
>> calling usb_gadget_start/stop() from the OTG core as they
>> wouldn't be defined in the built-in symbol table if
>> CONFIG_USB_GADGET is m.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  include/linux/usb/gadget.h | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>
>> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
>> index 2dd9e6b..f4fc0aa 100644
>> --- a/include/linux/usb/gadget.h
>> +++ b/include/linux/usb/gadget.h
>> @@ -639,6 +639,22 @@ struct usb_gadget_driver {
>>  };
>>  
>>  
>> +/*-------------------------------------------------------------------------*/
>> +
>> +/**
>> + * struct otg_gadget_ops - Interface between OTG core and gadget
>> + *
>> + * Provided by the gadget core to allow the OTG core to start/stop the gadget
>> + *
>> + * @start: function to start the gadget
>> + * @stop: function to stop the gadget
>> + * @connect_control: function to connect/disconnect from the bus
>> + */
>> +struct otg_gadget_ops {
>> +	int (*start)(struct usb_gadget *gadget);
>> +	int (*stop)(struct usb_gadget *gadget);
>> +	int (*connect_control)(struct usb_gadget *gadget, bool connect);
>> +};
> 
> you shouldn't need these at all. They are already part of the gadget
> framework as ->udc_start(), ->udc_stop() and ->pullup()
> 

This is to avoid the undefined symbol errors during build when OTG has is
built-in because USB (host) is built-in but GADGET is still a module.

cheers,
-roger



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