1 // SPDX-License-Identifier: GPL-2.0
3 #ifndef __LINUX_USB_ROLE_H
4 #define __LINUX_USB_ROLE_H
6 #include <linux/device.h>
8 struct usb_role_switch;
17 typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
19 typedef enum usb_role (*usb_role_switch_get_t)(struct usb_role_switch *sw);
22 * struct usb_role_switch_desc - USB Role Switch Descriptor
23 * @fwnode: The device node to be associated with the role switch
24 * @usb2_port: Optional reference to the host controller port device (USB2)
25 * @usb3_port: Optional reference to the host controller port device (USB3)
26 * @udc: Optional reference to the peripheral controller device
27 * @set: Callback for setting the role
28 * @get: Callback for getting the role (optional)
29 * @allow_userspace_control: If true userspace may change the role through sysfs
30 * @driver_data: Private data pointer
31 * @name: Name for the switch (optional)
33 * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
34 * device controller behind the USB connector with the role switch. If
35 * @usb2_port, @usb3_port and @udc are included in the description, the
36 * reference count for them should be incremented by the caller of
37 * usb_role_switch_register() before registering the switch.
39 struct usb_role_switch_desc {
40 struct fwnode_handle *fwnode;
41 struct device *usb2_port;
42 struct device *usb3_port;
44 usb_role_switch_set_t set;
45 usb_role_switch_get_t get;
46 bool allow_userspace_control;
52 #if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
53 int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
54 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
55 struct usb_role_switch *usb_role_switch_get(struct device *dev);
56 struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
57 void usb_role_switch_put(struct usb_role_switch *sw);
59 struct usb_role_switch *
60 usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode);
62 struct usb_role_switch *
63 usb_role_switch_register(struct device *parent,
64 const struct usb_role_switch_desc *desc);
65 void usb_role_switch_unregister(struct usb_role_switch *sw);
67 void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data);
68 void *usb_role_switch_get_drvdata(struct usb_role_switch *sw);
69 const char *usb_role_string(enum usb_role role);
71 static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
77 static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
82 static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
84 return ERR_PTR(-ENODEV);
87 static inline struct usb_role_switch *
88 fwnode_usb_role_switch_get(struct fwnode_handle *node)
90 return ERR_PTR(-ENODEV);
93 static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
95 static inline struct usb_role_switch *
96 usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
101 static inline struct usb_role_switch *
102 usb_role_switch_register(struct device *parent,
103 const struct usb_role_switch_desc *desc)
105 return ERR_PTR(-ENODEV);
108 static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
111 usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
115 static inline void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
120 static inline const char *usb_role_string(enum usb_role role)
127 #endif /* __LINUX_USB_ROLE_H */