From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Chen Subject: Re: [RFC][PATCH v2 04/13] usb: gadget: add usb_gadget_start/stop() Date: Thu, 16 Apr 2015 19:48:40 +0800 Message-ID: <20150416114839.GD3181@shlinux2> References: <1429008120-5395-1-git-send-email-rogerq@ti.com> <1429008120-5395-5-git-send-email-rogerq@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <1429008120-5395-5-git-send-email-rogerq-l0cyMroinI0@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Roger Quadros Cc: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, balbi-l0cyMroinI0@public.gmane.org, stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org, dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org, mathias.nyman-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-omap@vger.kernel.org On Tue, Apr 14, 2015 at 01:41:51PM +0300, Roger Quadros wrote: > The OTG state machine needs a mechanism to start and > stop the gadget controller. Add usb_gadget_start() > and usb_gadget_stop(). > > Signed-off-by: Roger Quadros > --- > drivers/usb/gadget/udc/udc-core.c | 74 +++++++++++++++++++++++++++++++++++++++ > include/linux/usb/gadget.h | 3 ++ > 2 files changed, 77 insertions(+) > > diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c > index 5a81cb0..3aa5dd5 100644 > --- a/drivers/usb/gadget/udc/udc-core.c > +++ b/drivers/usb/gadget/udc/udc-core.c > @@ -187,6 +187,7 @@ EXPORT_SYMBOL_GPL(usb_gadget_udc_reset); > */ > static inline int usb_gadget_udc_start(struct usb_udc *udc) > { > + dev_dbg(&udc->dev, "%s\n", __func__); > return udc->gadget->ops->udc_start(udc->gadget, udc->driver); > } > > @@ -204,10 +205,83 @@ static inline int usb_gadget_udc_start(struct usb_udc *udc) > */ > static inline void usb_gadget_udc_stop(struct usb_udc *udc) > { > + dev_dbg(&udc->dev, "%s\n", __func__); > udc->gadget->ops->udc_stop(udc->gadget); > } > > /** > + * usb_gadget_start - start the usb gadget controller and connect to bus > + * @gadget: the gadget device to start > + * > + * This is external API for use by OTG core. > + * > + * Start the usb device controller and connect to bus (enable pull). > + */ > +int usb_gadget_start(struct usb_gadget *gadget) > +{ > + int ret; > + struct usb_udc *udc = NULL; > + > + dev_dbg(&gadget->dev, "%s\n", __func__); > + mutex_lock(&udc_lock); > + list_for_each_entry(udc, &udc_list, list) > + if (udc->gadget == gadget) > + goto found; > + > + dev_err(gadget->dev.parent, "%s: gadget not registered.\n", > + __func__); > + mutex_unlock(&udc_lock); > + return -EINVAL; > + > +found: > + ret = usb_gadget_udc_start(udc); > + if (ret) > + dev_err(&udc->dev, "USB Device Controller didn't start: %d\n", > + ret); > + else > + usb_gadget_connect(udc->gadget); OTG FSM manages its pullup/pulldown itself through its fsm->ops->loc_conn > + > + mutex_unlock(&udc_lock); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(usb_gadget_start); > + > +/** > + * usb_gadget_stop - disconnect from bus and stop the usb gadget > + * @gadget: The gadget device we want to stop > + * > + * This is external API for use by OTG core. > + * > + * Disconnect from the bus (disable pull) and stop the > + * gadget controller. > + */ > +int usb_gadget_stop(struct usb_gadget *gadget) > +{ > + struct usb_udc *udc = NULL; > + > + dev_dbg(&gadget->dev, "%s\n", __func__); > + mutex_lock(&udc_lock); > + list_for_each_entry(udc, &udc_list, list) > + if (udc->gadget == gadget) > + goto found; > + > + dev_err(gadget->dev.parent, "%s: gadget not registered.\n", > + __func__); > + mutex_unlock(&udc_lock); > + return -EINVAL; > + > +found: > + usb_gadget_disconnect(udc->gadget); > + udc->driver->disconnect(udc->gadget); > + usb_gadget_udc_stop(udc); > + mutex_unlock(&udc_lock); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(usb_gadget_stop); > + > +/** > * usb_udc_release - release the usb_udc struct > * @dev: the dev member within usb_udc > * > diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h > index e2f00fd..7ada7e6 100644 > --- a/include/linux/usb/gadget.h > +++ b/include/linux/usb/gadget.h > @@ -922,6 +922,9 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver); > */ > int usb_gadget_unregister_driver(struct usb_gadget_driver *driver); > > +int usb_gadget_start(struct usb_gadget *gadget); > +int usb_gadget_stop(struct usb_gadget *gadget); > + > extern int usb_add_gadget_udc_release(struct device *parent, > struct usb_gadget *gadget, void (*release)(struct device *dev)); > extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget); > -- > 2.1.0 > -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html