1 files changed, 80 insertions, 10 deletions

diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index f8f62c3ed65e..ffd8fa541101 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -101,6 +101,16 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 
 /* ------------------------------------------------------------------------- */
 
+void usb_gadget_set_state(struct usb_gadget *gadget,
+		enum usb_device_state state)
+{
+	gadget->state = state;
+	sysfs_notify(&gadget->dev.kobj, NULL, "status");
+}
+EXPORT_SYMBOL_GPL(usb_gadget_set_state);
+
+/* ------------------------------------------------------------------------- */
+
 /**
  * usb_gadget_udc_start - tells usb device controller to start up
  * @gadget: The gadget we want to get started
@@ -156,15 +166,23 @@ static void usb_udc_release(struct device *dev)
 }
 
 static const struct attribute_group *usb_udc_attr_groups[];
+
+static void usb_udc_nop_release(struct device *dev)
+{
+	dev_vdbg(dev, "%s\n", __func__);
+}
+
 /**
- * usb_add_gadget_udc - adds a new gadget to the udc class driver list
- * @parent: the parent device to this udc. Usually the controller
- * driver's device.
- * @gadget: the gadget to be added to the list
+ * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
+ * @parent: the parent device to this udc. Usually the controller driver's
+ * device.
+ * @gadget: the gadget to be added to the list.
+ * @release: a gadget release function.
  *
  * Returns zero on success, negative errno otherwise.
  */
-int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
+int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
+		void (*release)(struct device *dev))
 {
 	struct usb_udc		*udc;
 	int			ret = -ENOMEM;
@@ -173,6 +191,22 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 	if (!udc)
 		goto err1;
 
+	dev_set_name(&gadget->dev, "gadget");
+	gadget->dev.parent = parent;
+
+	dma_set_coherent_mask(&gadget->dev, parent->coherent_dma_mask);
+	gadget->dev.dma_parms = parent->dma_parms;
+	gadget->dev.dma_mask = parent->dma_mask;
+
+	if (release)
+		gadget->dev.release = release;
+	else
+		gadget->dev.release = usb_udc_nop_release;
+
+	ret = device_register(&gadget->dev);
+	if (ret)
+		goto err2;
+
 	device_initialize(&udc->dev);
 	udc->dev.release = usb_udc_release;
 	udc->dev.class = udc_class;
@@ -180,7 +214,7 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 	udc->dev.parent = parent;
 	ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
 	if (ret)
-		goto err2;
+		goto err3;
 
 	udc->gadget = gadget;
 
@@ -189,21 +223,42 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
 
 	ret = device_add(&udc->dev);
 	if (ret)
-		goto err3;
+		goto err4;
+
+	usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
 
 	mutex_unlock(&udc_lock);
 
 	return 0;
-err3:
+
+err4:
 	list_del(&udc->list);
 	mutex_unlock(&udc_lock);
 
-err2:
+err3:
 	put_device(&udc->dev);
 
+err2:
+	put_device(&gadget->dev);
+	kfree(udc);
+
 err1:
 	return ret;
 }
+EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
+
+/**
+ * usb_add_gadget_udc - adds a new gadget to the udc class driver list
+ * @parent: the parent device to this udc. Usually the controller
+ * driver's device.
+ * @gadget: the gadget to be added to the list
+ *
+ * Returns zero on success, negative errno otherwise.
+ */
+int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
+{
+	return usb_add_gadget_udc_release(parent, gadget, NULL);
+}
 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
 
 static void usb_gadget_remove_driver(struct usb_udc *udc)
@@ -220,6 +275,7 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
 
 	udc->driver = NULL;
 	udc->dev.driver = NULL;
+	udc->gadget->dev.driver = NULL;
 }
 
 /**
@@ -254,6 +310,7 @@ found:
 
 	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
 	device_unregister(&udc->dev);
+	device_unregister(&gadget->dev);
 }
 EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
 
@@ -268,6 +325,7 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
 
 	udc->driver = driver;
 	udc->dev.driver = &driver->driver;
+	udc->gadget->dev.driver = &driver->driver;
 
 	ret = driver->bind(udc->gadget, driver);
 	if (ret)
@@ -286,6 +344,7 @@ err1:
 			udc->driver->function, ret);
 	udc->driver = NULL;
 	udc->dev.driver = NULL;
+	udc->gadget->dev.driver = NULL;
 	return ret;
 }
 
@@ -395,6 +454,16 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
 }
 static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
 
+static ssize_t usb_gadget_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
+	struct usb_gadget	*gadget = udc->gadget;
+
+	return sprintf(buf, "%s\n", usb_state_string(gadget->state));
+}
+static DEVICE_ATTR(state, S_IRUGO, usb_gadget_state_show, NULL);
+
 #define USB_UDC_SPEED_ATTR(name, param)					\
 ssize_t usb_udc_##param##_show(struct device *dev,			\
 		struct device_attribute *attr, char *buf)		\
@@ -403,7 +472,7 @@ ssize_t usb_udc_##param##_show(struct device *dev,			\
 	return snprintf(buf, PAGE_SIZE, "%s\n",				\
 			usb_speed_string(udc->gadget->param));		\
 }									\
-static DEVICE_ATTR(name, S_IRUSR, usb_udc_##param##_show, NULL)
+static DEVICE_ATTR(name, S_IRUGO, usb_udc_##param##_show, NULL)
 
 static USB_UDC_SPEED_ATTR(current_speed, speed);
 static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
@@ -428,6 +497,7 @@ static USB_UDC_ATTR(a_alt_hnp_support);
 static struct attribute *usb_udc_attrs[] = {
 	&dev_attr_srp.attr,
 	&dev_attr_soft_connect.attr,
+	&dev_attr_state.attr,
 	&dev_attr_current_speed.attr,
 	&dev_attr_maximum_speed.attr,