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Subject[PATCH] usb: udc: add gadget state kobject uevent
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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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