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1// SPDX-License-Identifier: GPL-2.0
2
3#ifndef __LINUX_USB_ROLE_H
4#define __LINUX_USB_ROLE_H
5
6#include <linux/device.h>
7
8struct usb_role_switch;
9
10enum usb_role {
11 USB_ROLE_NONE,
12 USB_ROLE_HOST,
13 USB_ROLE_DEVICE,
14};
15
16typedef int (*usb_role_switch_set_t)(struct device *dev, enum usb_role role);
17typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);
18
19/**
20 * struct usb_role_switch_desc - USB Role Switch Descriptor
21 * @fwnode: The device node to be associated with the role switch
22 * @usb2_port: Optional reference to the host controller port device (USB2)
23 * @usb3_port: Optional reference to the host controller port device (USB3)
24 * @udc: Optional reference to the peripheral controller device
25 * @set: Callback for setting the role
26 * @get: Callback for getting the role (optional)
27 * @allow_userspace_control: If true userspace may change the role through sysfs
28 *
29 * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
30 * device controller behind the USB connector with the role switch. If
31 * @usb2_port, @usb3_port and @udc are included in the description, the
32 * reference count for them should be incremented by the caller of
33 * usb_role_switch_register() before registering the switch.
34 */
35struct usb_role_switch_desc {
36 struct fwnode_handle *fwnode;
37 struct device *usb2_port;
38 struct device *usb3_port;
39 struct device *udc;
40 usb_role_switch_set_t set;
41 usb_role_switch_get_t get;
42 bool allow_userspace_control;
43};
44
45
46#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
47int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
48enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
49struct usb_role_switch *usb_role_switch_get(struct device *dev);
50struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
51void usb_role_switch_put(struct usb_role_switch *sw);
52
53struct usb_role_switch *
54usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode);
55
56struct usb_role_switch *
57usb_role_switch_register(struct device *parent,
58 const struct usb_role_switch_desc *desc);
59void usb_role_switch_unregister(struct usb_role_switch *sw);
60#else
61static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
62 enum usb_role role)
63{
64 return 0;
65}
66
67static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
68{
69 return USB_ROLE_NONE;
70}
71
72static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
73{
74 return ERR_PTR(-ENODEV);
75}
76
77static inline struct usb_role_switch *
78fwnode_usb_role_switch_get(struct fwnode_handle *node)
79{
80 return ERR_PTR(-ENODEV);
81}
82
83static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
84
85static inline struct usb_role_switch *
86usb_role_switch_register(struct device *parent,
87 const struct usb_role_switch_desc *desc)
88{
89 return ERR_PTR(-ENODEV);
90}
91
92static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
93#endif
94
95#endif /* __LINUX_USB_ROLE_H */