Hi,
Roger Quadros <rog...@ti.com> writes:
> [ Unknown signature status ]
> On 20/06/16 10:21, Felipe Balbi wrote:
>>
>> Hi,
>>
>> Roger Quadros <rog...@ti.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 <rog...@ti.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.change your Kconfig dependencies. OTG layer shouldn't be built-in unless both Gadget and Host are built-in. -- balbi
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