Messages in this thread Patch in this message | | | Date | Mon, 15 Jul 2013 11:57:24 +0800 | Subject | [PATCH] usb: udc: add gadget state kobject uevent | From | Rong Wang <> |
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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@csr.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; }
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