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Date: Fri, 6 May 2016 17:41:03 +0800 From: Peter Chen <hzpeterchen@...il.com> To: Roger Quadros <rogerq@...com> Cc: peter.chen@...escale.com, stern@...land.harvard.edu, balbi@...nel.org, gregkh@...uxfoundation.org, dan.j.williams@...el.com, jun.li@...escale.com, mathias.nyman@...ux.intel.com, tony@...mide.com, Joao.Pinto@...opsys.com, abrestic@...omium.org, yoshihiro.shimoda.uh@...esas.com, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org, devicetree@...r.kernel.org Subject: Re: [PATCH v7 03/14] usb: hcd.h: Add OTG to HCD interface On Mon, May 02, 2016 at 03:18:46PM +0300, Roger Quadros wrote: > The OTG core will use struct otg_hcd_ops to interface > with the HCD controller. > > 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> Roger, after thinking more, I still think current dependency between OTG, HCD and gadget are too complicated. Since the OTG can't work if it is built as module, I suggest letting OTG depends on HCD && USB_GADGET, and it is a boolean, in that case, we don't need to export any HCD and gadget ops, things will be much simpler. What's your opinion? Peter > --- > 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 b98f831..861ccaa 100644 > --- a/include/linux/usb/hcd.h > +++ b/include/linux/usb/hcd.h > @@ -399,6 +399,30 @@ 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 of 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; > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best Regards, Peter Chen
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