summaryrefslogtreecommitdiff
path: root/include/linux/usb/role.h
blob: 2d77f97df72d6422a2445eeb4b3fba6d63a26d59 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
// SPDX-License-Identifier: GPL-2.0

#ifndef __LINUX_USB_ROLE_H
#define __LINUX_USB_ROLE_H

#include <linux/device.h>

struct usb_role_switch;

enum usb_role {
	USB_ROLE_NONE,
	USB_ROLE_HOST,
	USB_ROLE_DEVICE,
};

typedef int (*usb_role_switch_set_t)(struct device *dev, enum usb_role role);
typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);

/**
 * struct usb_role_switch_desc - USB Role Switch Descriptor
 * @fwnode: The device node to be associated with the role switch
 * @usb2_port: Optional reference to the host controller port device (USB2)
 * @usb3_port: Optional reference to the host controller port device (USB3)
 * @udc: Optional reference to the peripheral controller device
 * @set: Callback for setting the role
 * @get: Callback for getting the role (optional)
 * @allow_userspace_control: If true userspace may change the role through sysfs
 *
 * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
 * device controller behind the USB connector with the role switch. If
 * @usb2_port, @usb3_port and @udc are included in the description, the
 * reference count for them should be incremented by the caller of
 * usb_role_switch_register() before registering the switch.
 */
struct usb_role_switch_desc {
	struct fwnode_handle *fwnode;
	struct device *usb2_port;
	struct device *usb3_port;
	struct device *udc;
	usb_role_switch_set_t set;
	usb_role_switch_get_t get;
	bool allow_userspace_control;
};


#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
struct usb_role_switch *usb_role_switch_get(struct device *dev);
struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
void usb_role_switch_put(struct usb_role_switch *sw);

struct usb_role_switch *
usb_role_switch_register(struct device *parent,
			 const struct usb_role_switch_desc *desc);
void usb_role_switch_unregister(struct usb_role_switch *sw);
#else
static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
		enum usb_role role)
{
	return 0;
}

static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
{
	return USB_ROLE_NONE;
}

static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
{
	return ERR_PTR(-ENODEV);
}

static inline struct usb_role_switch *
fwnode_usb_role_switch_get(struct fwnode_handle *node)
{
	return ERR_PTR(-ENODEV);
}

static inline void usb_role_switch_put(struct usb_role_switch *sw) { }

static inline struct usb_role_switch *
usb_role_switch_register(struct device *parent,
			 const struct usb_role_switch_desc *desc)
{
	return ERR_PTR(-ENODEV);
}

static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
#endif

#endif /* __LINUX_USB_ROLE_H */