From 628ef0d273a69d889669a459fb4675c678ae0418 Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Fri, 6 Mar 2015 10:36:03 +0800 Subject: [PATCH] usb: udc: add usb_udc_vbus_handler This commit updates udc core vbus status, and try to connect or disconnect gadget. Signed-off-by: Peter Chen Acked-by: Alan Stern Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/udc-core.c | 34 ++++++++++++++++++++++++++++++- include/linux/usb/gadget.h | 4 ++++ 2 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c index bf7ed777a87d..d69c35558f68 100644 --- a/drivers/usb/gadget/udc/udc-core.c +++ b/drivers/usb/gadget/udc/udc-core.c @@ -35,6 +35,8 @@ * @dev - the child device to the actual controller * @gadget - the gadget. For use by the class code * @list - for use by the udc class driver + * @vbus - for udcs who care about vbus status, this value is real vbus status; + * for udcs who do not care about vbus status, this value is always true * * This represents the internal data structure which is used by the UDC-class * to hold information about udc driver and gadget together. @@ -44,6 +46,7 @@ struct usb_udc { struct usb_gadget *gadget; struct device dev; struct list_head list; + bool vbus; }; static struct class *udc_class; @@ -145,6 +148,34 @@ EXPORT_SYMBOL_GPL(usb_gadget_set_state); /* ------------------------------------------------------------------------- */ +static void usb_udc_connect_control(struct usb_udc *udc) +{ + if (udc->vbus) + usb_gadget_connect(udc->gadget); + else + usb_gadget_disconnect(udc->gadget); +} + +/** + * usb_udc_vbus_handler - updates the udc core vbus status, and try to + * connect or disconnect gadget + * @gadget: The gadget which vbus change occurs + * @status: The vbus status + * + * The udc driver calls it when it wants to connect or disconnect gadget + * according to vbus status. + */ +void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) +{ + struct usb_udc *udc = gadget->udc; + + if (udc) { + udc->vbus = status; + usb_udc_connect_control(udc); + } +} +EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); + /** * usb_gadget_udc_reset - notifies the udc core that bus reset occurs * @gadget: The gadget which bus reset occurs @@ -278,6 +309,7 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, goto err4; usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED); + udc->vbus = true; mutex_unlock(&udc_lock); @@ -381,7 +413,7 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri driver->unbind(udc->gadget); goto err1; } - usb_gadget_connect(udc->gadget); + usb_udc_connect_control(udc); kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); return 0; diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 242c694a5b85..4f3dfb7d0654 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -1032,6 +1032,10 @@ extern void usb_gadget_udc_reset(struct usb_gadget *gadget, extern void usb_gadget_giveback_request(struct usb_ep *ep, struct usb_request *req); +/*-------------------------------------------------------------------------*/ + +/* utility to update vbus status for udc core, it may be scheduled */ +extern void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status); /*-------------------------------------------------------------------------*/ -- 2.20.1