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1/* USB OTG (On The Go) defines */
2/*
3 *
4 * These APIs may be used between USB controllers. USB device drivers
5 * (for either host or peripheral roles) don't use these calls; they
6 * continue to use just usb_device and usb_gadget.
7 */
8
9#ifndef __LINUX_USB_OTG_H
10#define __LINUX_USB_OTG_H
11
12#include <linux/phy/phy.h>
13#include <linux/usb/phy.h>
14
15struct usb_otg {
16 u8 default_a;
17
18 struct phy *phy;
19 /* old usb_phy interface */
20 struct usb_phy *usb_phy;
21 struct usb_bus *host;
22 struct usb_gadget *gadget;
23
24 enum usb_otg_state state;
25
26 /* bind/unbind the host controller */
27 int (*set_host)(struct usb_otg *otg, struct usb_bus *host);
28
29 /* bind/unbind the peripheral controller */
30 int (*set_peripheral)(struct usb_otg *otg,
31 struct usb_gadget *gadget);
32
33 /* effective for A-peripheral, ignored for B devices */
34 int (*set_vbus)(struct usb_otg *otg, bool enabled);
35
36 /* for B devices only: start session with A-Host */
37 int (*start_srp)(struct usb_otg *otg);
38
39 /* start or continue HNP role switch */
40 int (*start_hnp)(struct usb_otg *otg);
41
42};
43
44/**
45 * struct usb_otg_caps - describes the otg capabilities of the device
46 * @otg_rev: The OTG revision number the device is compliant with, it's
47 * in binary-coded decimal (i.e. 2.0 is 0200H).
48 * @hnp_support: Indicates if the device supports HNP.
49 * @srp_support: Indicates if the device supports SRP.
50 * @adp_support: Indicates if the device supports ADP.
51 */
52struct usb_otg_caps {
53 u16 otg_rev;
54 bool hnp_support;
55 bool srp_support;
56 bool adp_support;
57};
58
59extern const char *usb_otg_state_string(enum usb_otg_state state);
60
61/* Context: can sleep */
62static inline int
63otg_start_hnp(struct usb_otg *otg)
64{
65 if (otg && otg->start_hnp)
66 return otg->start_hnp(otg);
67
68 return -ENOTSUPP;
69}
70
71/* Context: can sleep */
72static inline int
73otg_set_vbus(struct usb_otg *otg, bool enabled)
74{
75 if (otg && otg->set_vbus)
76 return otg->set_vbus(otg, enabled);
77
78 return -ENOTSUPP;
79}
80
81/* for HCDs */
82static inline int
83otg_set_host(struct usb_otg *otg, struct usb_bus *host)
84{
85 if (otg && otg->set_host)
86 return otg->set_host(otg, host);
87
88 return -ENOTSUPP;
89}
90
91/* for usb peripheral controller drivers */
92
93/* Context: can sleep */
94static inline int
95otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
96{
97 if (otg && otg->set_peripheral)
98 return otg->set_peripheral(otg, periph);
99
100 return -ENOTSUPP;
101}
102
103static inline int
104otg_start_srp(struct usb_otg *otg)
105{
106 if (otg && otg->start_srp)
107 return otg->start_srp(otg);
108
109 return -ENOTSUPP;
110}
111
112/* for OTG controller drivers (and maybe other stuff) */
113extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
114
115enum usb_dr_mode {
116 USB_DR_MODE_UNKNOWN,
117 USB_DR_MODE_HOST,
118 USB_DR_MODE_PERIPHERAL,
119 USB_DR_MODE_OTG,
120};
121
122/**
123 * usb_get_dr_mode - Get dual role mode for given device
124 * @dev: Pointer to the given device
125 *
126 * The function gets phy interface string from property 'dr_mode',
127 * and returns the correspondig enum usb_dr_mode
128 */
129extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
130
131#endif /* __LINUX_USB_OTG_H */