linux-kernel - Re: [PATCH v10 03/14] usb: hcd.h: Add OTG to HCD interface

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Date:	Tue, 14 Jun 2016 11:17:17 +0300
From:	Roger Quadros <rogerq@...com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	<peter.chen@...escale.com>, <balbi@...nel.org>, <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 03/14] usb: hcd.h: Add OTG to HCD interface

+Alan

On 10/06/16 16:07, Roger Quadros wrote:
> The OTG core will use struct otg_hcd_ops to interface
> with the HCD (Host Controller Driver).
> 
> The main purpose of this interface is to avoid directly
> calling HCD APIs from the OTG core as they
> wouldn't be defined in the built-in symbol table if
> CONFIG_USB is m.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Acked-by: Peter Chen <peter.chen@....com>
> ---
>  include/linux/usb/hcd.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index 66fc137..7729c1f 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -400,6 +400,30 @@ struct hc_driver {
>  
>  };
>  
> +/**
> + * struct otg_hcd_ops - Interface between OTG core and HCD
> + *
> + * Provided by the HCD core to allow the OTG core to interface with the HCD
> + *
> + * @add: function to add the HCD
> + * @remove: function to remove the HCD
> + * @usb_bus_start_enum: function to immediately start bus enumeration
> + * @usb_control_msg: function to build and send a control URB
> + * @usb_hub_find_child: function to get pointer to the child device
> + */
> +struct otg_hcd_ops {
> +	int (*add)(struct usb_hcd *hcd,
> +		   unsigned int irqnum, unsigned long irqflags);
> +	void (*remove)(struct usb_hcd *hcd);
> +	int (*usb_bus_start_enum)(struct usb_bus *bus, unsigned int port_num);
> +	int (*usb_control_msg)(struct usb_device *dev, unsigned int pipe,
> +			       __u8 request, __u8 requesttype, __u16 value,
> +			       __u16 index, void *data, __u16 size,
> +			       int timeout);
> +	struct usb_device * (*usb_hub_find_child)(struct usb_device *hdev,
> +						  int port1);
> +};
> +
>  static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
>  {
>  	return hcd->driver->flags & HCD_BH;
> 

--
cheers,
-roger