linux-kernel - Re: [PATCH v6 1/4] usb: gadget: udc: core: Introduce check

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Date:   Fri, 22 Jan 2021 11:24:47 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Wesley Cheng <wcheng@...eaurora.org>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org, robh+dt@...nel.org,
        agross@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        peter.chen@....com, jackp@...eaurora.org
Subject: Re: [PATCH v6 1/4] usb: gadget: udc: core: Introduce check_config to
 verify USB configuration

On Thu, Jan 21, 2021 at 08:01:37PM -0800, Wesley Cheng wrote:
> Some UDCs may have constraints on how many high bandwidth endpoints it can
> support in a certain configuration.  This API allows for the composite
> driver to pass down the total number of endpoints to the UDC so it can verify
> it has the required resources to support the configuration.
> 
> Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>


> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -328,6 +328,7 @@ struct usb_gadget_ops {
>  	struct usb_ep *(*match_ep)(struct usb_gadget *,
>  			struct usb_endpoint_descriptor *,
>  			struct usb_ss_ep_comp_descriptor *);
> +	int	(*check_config)(struct usb_gadget *gadget, unsigned long ep_map);
>  };
>  
>  /**
> @@ -607,6 +608,7 @@ int usb_gadget_connect(struct usb_gadget *gadget);
>  int usb_gadget_disconnect(struct usb_gadget *gadget);
>  int usb_gadget_deactivate(struct usb_gadget *gadget);
>  int usb_gadget_activate(struct usb_gadget *gadget);
> +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map);
>  #else
>  static inline int usb_gadget_frame_number(struct usb_gadget *gadget)
>  { return 0; }

Don't you also need an entry for the case where CONFIG_USB_GADGET isn't 
enabled?

Alan Stern