1 // SPDX-License-Identifier: GPL-2.0
36  * usb_role_switch_set_role - Set USB role for a switch
37  * @sw: USB role switch
40  * Set USB role @role for @sw.
42 int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role)  in usb_role_switch_set_role()  argument
46 	if (IS_ERR_OR_NULL(sw))  in usb_role_switch_set_role()
49 	mutex_lock(&sw->lock);  in usb_role_switch_set_role()
51 	ret = sw->set(sw, role);  in usb_role_switch_set_role()
53 		sw->role = role;  in usb_role_switch_set_role()
54 		kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);  in usb_role_switch_set_role()
57 	mutex_unlock(&sw->lock);  in usb_role_switch_set_role()
64  * usb_role_switch_get_role - Get the USB role for a switch
65  * @sw: USB role switch
67  * Depending on the role-switch-driver this function returns either a cached
70 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)  in usb_role_switch_get_role()  argument
74 	if (IS_ERR_OR_NULL(sw))  in usb_role_switch_get_role()
77 	mutex_lock(&sw->lock);  in usb_role_switch_get_role()
79 	if (sw->get)  in usb_role_switch_get_role()
80 		role = sw->get(sw);  in usb_role_switch_get_role()
82 		role = sw->role;  in usb_role_switch_get_role()
84 	mutex_unlock(&sw->lock);  in usb_role_switch_get_role()
100 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);  in usb_role_switch_match()
109 	if (!parent || !fwnode_property_present(parent, "usb-role-switch"))  in usb_role_switch_is_parent()
113 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);  in usb_role_switch_is_parent()
117  * usb_role_switch_get - Find USB role switch linked with the caller
125 	struct usb_role_switch *sw;  in usb_role_switch_get()  local
127 	sw = usb_role_switch_is_parent(dev_fwnode(dev));  in usb_role_switch_get()
128 	if (!sw)  in usb_role_switch_get()
129 		sw = device_connection_find_match(dev, "usb-role-switch", NULL,  in usb_role_switch_get()
132 	if (!IS_ERR_OR_NULL(sw))  in usb_role_switch_get()
133 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));  in usb_role_switch_get()
135 	return sw;  in usb_role_switch_get()
140  * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
148 	struct usb_role_switch *sw;  in fwnode_usb_role_switch_get()  local
150 	sw = usb_role_switch_is_parent(fwnode);  in fwnode_usb_role_switch_get()
151 	if (!sw)  in fwnode_usb_role_switch_get()
152 		sw = fwnode_connection_find_match(fwnode, "usb-role-switch",  in fwnode_usb_role_switch_get()
154 	if (!IS_ERR_OR_NULL(sw))  in fwnode_usb_role_switch_get()
155 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));  in fwnode_usb_role_switch_get()
157 	return sw;  in fwnode_usb_role_switch_get()
162  * usb_role_switch_put - Release handle to a switch
163  * @sw: USB Role Switch
165  * Decrement reference count for @sw.
167 void usb_role_switch_put(struct usb_role_switch *sw)  in usb_role_switch_put()  argument
169 	if (!IS_ERR_OR_NULL(sw)) {  in usb_role_switch_put()
170 		module_put(sw->dev.parent->driver->owner);  in usb_role_switch_put()
171 		put_device(&sw->dev);  in usb_role_switch_put()
177  * usb_role_switch_find_by_fwnode - Find USB role switch with its fwnode
193 		WARN_ON(!try_module_get(dev->parent->driver->owner));  in usb_role_switch_find_by_fwnode()
203 	struct usb_role_switch *sw = to_role_switch(dev);  in usb_role_switch_is_visible()  local
205 	if (sw->allow_userspace_control)  in usb_role_switch_is_visible()
206 		return attr->mode;  in usb_role_switch_is_visible()
220 	struct usb_role_switch *sw = to_role_switch(dev);  in role_show()  local
221 	enum usb_role role = usb_role_switch_get_role(sw);  in role_show()
229 	struct usb_role_switch *sw = to_role_switch(dev);  in role_store()  local
239 			return -EINVAL;  in role_store()
242 	ret = usb_role_switch_set_role(sw, ret);  in role_store()
279 	struct usb_role_switch *sw = to_role_switch(dev);  in usb_role_switch_release()  local
281 	kfree(sw);  in usb_role_switch_release()
292  * usb_role_switch_register - Register USB Role Switch
297  * On platforms where the USB controller is dual-role capable, the controller
309 	struct usb_role_switch *sw;  in usb_role_switch_register()  local
312 	if (!desc || !desc->set)  in usb_role_switch_register()
313 		return ERR_PTR(-EINVAL);  in usb_role_switch_register()
315 	sw = kzalloc(sizeof(*sw), GFP_KERNEL);  in usb_role_switch_register()
316 	if (!sw)  in usb_role_switch_register()
317 		return ERR_PTR(-ENOMEM);  in usb_role_switch_register()
319 	mutex_init(&sw->lock);  in usb_role_switch_register()
321 	sw->allow_userspace_control = desc->allow_userspace_control;  in usb_role_switch_register()
322 	sw->usb2_port = desc->usb2_port;  in usb_role_switch_register()
323 	sw->usb3_port = desc->usb3_port;  in usb_role_switch_register()
324 	sw->udc = desc->udc;  in usb_role_switch_register()
325 	sw->set = desc->set;  in usb_role_switch_register()
326 	sw->get = desc->get;  in usb_role_switch_register()
328 	sw->dev.parent = parent;  in usb_role_switch_register()
329 	sw->dev.fwnode = desc->fwnode;  in usb_role_switch_register()
330 	sw->dev.class = role_class;  in usb_role_switch_register()
331 	sw->dev.type = &usb_role_dev_type;  in usb_role_switch_register()
332 	dev_set_drvdata(&sw->dev, desc->driver_data);  in usb_role_switch_register()
333 	dev_set_name(&sw->dev, "%s-role-switch",  in usb_role_switch_register()
334 		     desc->name ? desc->name : dev_name(parent));  in usb_role_switch_register()
336 	ret = device_register(&sw->dev);  in usb_role_switch_register()
338 		put_device(&sw->dev);  in usb_role_switch_register()
344 	return sw;  in usb_role_switch_register()
349  * usb_role_switch_unregister - Unregsiter USB Role Switch
350  * @sw: USB Role Switch
354 void usb_role_switch_unregister(struct usb_role_switch *sw)  in usb_role_switch_unregister()  argument
356 	if (!IS_ERR_OR_NULL(sw))  in usb_role_switch_unregister()
357 		device_unregister(&sw->dev);  in usb_role_switch_unregister()
362  * usb_role_switch_set_drvdata - Assign private data pointer to a switch
363  * @sw: USB Role Switch
366 void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)  in usb_role_switch_set_drvdata()  argument
368 	dev_set_drvdata(&sw->dev, data);  in usb_role_switch_set_drvdata()
373  * usb_role_switch_get_drvdata - Get the private data pointer of a switch
374  * @sw: USB Role Switch
376 void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)  in usb_role_switch_get_drvdata()  argument
378 	return dev_get_drvdata(&sw->dev);  in usb_role_switch_get_drvdata()