On Fri, May 18, 2012 at 09:19:25PM -0700, Greg Kroah-Hartman wrote:
> On Sat, May 19, 2012 at 09:35:30AM +0800, Richard Zhao wrote:
> > On Tue, May 15, 2012 at 08:14:13AM -0700, Greg Kroah-Hartman wrote:
> > > On Tue, May 15, 2012 at 06:10:19AM +0200, Marek Vasut wrote:
> > > > Add this function so for example USB Host driver can notify
> > > > the PHY about some event. This is useful for me on i.MX28, where
> > > > I need to tell the PHY, from the EHCI interrupt handler, to disable
> > > > disconnection detector (or reenable it).
> > > >
> > > > Signed-off-by: Marek Vasut <marex@xxxxxxx>
> > > > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> > > > Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
> > > > Cc: Felipe Balbi <balbi@xxxxxx>
> > > > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> > > > Cc: Linux USB <linux-usb@xxxxxxxxxxxxxxx>
> > > > ---
> > > > include/linux/usb/otg.h | 12 ++++++++++++
> > > > 1 file changed, 12 insertions(+)
> > > >
> > > > diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> > > > index 38ab3f4..4a74618 100644
> > > > --- a/include/linux/usb/otg.h
> > > > +++ b/include/linux/usb/otg.h
> > > > @@ -117,6 +117,9 @@ struct usb_phy {
> > > > int (*set_suspend)(struct usb_phy *x,
> > > > int suspend);
> > > >
> > > > + /* for host driver to pass data to the PHY */
> > > > + int (*notify)(struct usb_phy *x,
> > > > + void *data);
> > >
> > > Wow that is vague.
> > >
> > > Notify what? Of what? With what? About what?
> > >
> > > Ick ick ick.
> > >
> > > Please make this specific as to exactly what you are wanting to do, this
> > > patch is not specific at all. Hint, if you are ever passing in a void *,
> > > you are probably doing something wrong...
> > >
> >
> > how about this one?
> >
> > diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> > index 38ab3f4..705e391 100644
> > --- a/include/linux/usb/otg.h
> > +++ b/include/linux/usb/otg.h
> > @@ -43,6 +43,12 @@ enum usb_phy_events {
> > USB_EVENT_ENUMERATED, /* gadget driver enumerated */
> > };
> >
> > +/* define events for usb host or device driver to notify the PHY */
> > +enum usb_events {
> > + USB_EVENT_HCD_CONNECT, /* device connected to the host */
> > + USB_EVENT_HCD_DISCONNECT, /* device disconnected to the host */
> > +};
> > +
> > struct usb_phy;
> >
> > /* for transceivers connected thru an ULPI interface, the user must
> > @@ -117,6 +123,9 @@ struct usb_phy {
> > int (*set_suspend)(struct usb_phy *x,
> > int suspend);
> >
> > + /* for host driver to pass data to the PHY */
> > + int (*notify)(struct usb_phy *x,
> > + enum usb_events ev, void *data);
>
> Let me guess, you have experience with a different operating system... :)
yes, the style can be often seen. :)
>
> Closer, but you've heard the famous quote about History and those who do
> not learn it, right?
>
> Again, be specific, it looks like you want 2 different callbacks here,
> right? Then make them:
> int notify_connect(struct usb_phy *phy);
> int notify_disconnect(struct usb_phy *phy);
> that should be all that you need.
It's enough for me. The next problem is where to call it.
>
> We've learned from our past mistakes in trying to pass in events and
> then extending them, and people getting confused, and all hell breaking
> out in other parts of the kernel. It took a few years to clean up the
> mess, let's not ever do that again, even in tiny ways like this. Just
> spell it out, be specific, and look, no void * needed at all.
Understood.
Thanks
Richard
>
> greg k-h
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