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Date: Mon, 15 Jul 2013 11:57:24 +0800 From: Rong Wang <wr011235813@...il.com> To: balbi@...com, Greg KH <gregkh@...uxfoundation.org> Cc: arnd@...db.de, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, Rong.Wang@....com Subject: [PATCH] usb: udc: add gadget state kobject uevent usb: udc: add gadget state kobject uevent Add USB_UDC_STATE environment variable in udc uevent callback and trigger kobject_uevent in usb_gadget_set_state to inform the user-space the state of the gadget. Signed-off-by: Rong Wang <Rong.Wang@....com> diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c index ffd8fa5..05715d1 100644 --- a/drivers/usb/gadget/udc-core.c +++ b/drivers/usb/gadget/udc-core.c @@ -101,11 +101,32 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request); /* ------------------------------------------------------------------------- */ +/** + * usb_gadget_set_state - set usb gadget state + * @gadget: gadget device + * @state: state defined in USB specification ch9 + * Context: !in_interrupt() + */ void usb_gadget_set_state(struct usb_gadget *gadget, enum usb_device_state state) { + struct usb_udc *udc = NULL; + gadget->state = state; sysfs_notify(&gadget->dev.kobj, NULL, "status"); + + mutex_lock(&udc_lock); + list_for_each_entry(udc, &udc_list, list) + if (udc->gadget == gadget) + goto found; + + dev_err(gadget->dev.parent, "gadget not registered.\n"); + mutex_unlock(&udc_lock); + return; + +found: + mutex_unlock(&udc_lock); + kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); } EXPORT_SYMBOL_GPL(usb_gadget_set_state); @@ -538,6 +559,15 @@ static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env) } } + if (udc->gadget) { + ret = add_uevent_var(env, "USB_UDC_STATE=%s", + usb_state_string(udc->gadget->state)); + if (ret) { + dev_err(dev, "failed to add uevent USB_UDC_STATE\n"); + return ret; + } + } + return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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