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usb: udc: add usb_udc_vbus_handler

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This commit updates udc core vbus status, and try to connect
or disconnect gadget.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Peter Chen 2015-03-06 10:36:03 +08:00 committed by Felipe Balbi
parent dfea9c9483
commit 628ef0d273
2 changed files with 37 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

34
drivers/usb/gadget/udc/udc-core.c
View file

@ -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;

4
include/linux/usb/gadget.h
View file

@ -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);
/*-------------------------------------------------------------------------*/