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Commit | Line | Data |
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1da177e4 LT |
1 | // include/linux/usb_otg.h |
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 | ||
10 | /* OTG defines lots of enumeration states before device reset */ | |
11 | enum usb_otg_state { | |
12 | OTG_STATE_UNDEFINED = 0, | |
13 | ||
14 | /* single-role peripheral, and dual-role default-b */ | |
15 | OTG_STATE_B_IDLE, | |
16 | OTG_STATE_B_SRP_INIT, | |
17 | OTG_STATE_B_PERIPHERAL, | |
18 | ||
19 | /* extra dual-role default-b states */ | |
20 | OTG_STATE_B_WAIT_ACON, | |
21 | OTG_STATE_B_HOST, | |
22 | ||
23 | /* dual-role default-a */ | |
24 | OTG_STATE_A_IDLE, | |
25 | OTG_STATE_A_WAIT_VRISE, | |
26 | OTG_STATE_A_WAIT_BCON, | |
27 | OTG_STATE_A_HOST, | |
28 | OTG_STATE_A_SUSPEND, | |
29 | OTG_STATE_A_PERIPHERAL, | |
30 | OTG_STATE_A_WAIT_VFALL, | |
31 | OTG_STATE_A_VBUS_ERR, | |
32 | }; | |
33 | ||
34 | /* | |
35 | * the otg driver needs to interact with both device side and host side | |
36 | * usb controllers. it decides which controller is active at a given | |
37 | * moment, using the transceiver, ID signal, HNP and sometimes static | |
38 | * configuration information (including "board isn't wired for otg"). | |
39 | */ | |
40 | struct otg_transceiver { | |
41 | struct device *dev; | |
42 | const char *label; | |
43 | ||
44 | u8 default_a; | |
45 | enum usb_otg_state state; | |
46 | ||
47 | struct usb_bus *host; | |
48 | struct usb_gadget *gadget; | |
49 | ||
50 | /* to pass extra port status to the root hub */ | |
51 | u16 port_status; | |
52 | u16 port_change; | |
53 | ||
54 | /* bind/unbind the host controller */ | |
55 | int (*set_host)(struct otg_transceiver *otg, | |
56 | struct usb_bus *host); | |
57 | ||
58 | /* bind/unbind the peripheral controller */ | |
59 | int (*set_peripheral)(struct otg_transceiver *otg, | |
60 | struct usb_gadget *gadget); | |
61 | ||
62 | /* effective for B devices, ignored for A-peripheral */ | |
63 | int (*set_power)(struct otg_transceiver *otg, | |
64 | unsigned mA); | |
65 | ||
4e67185a JY |
66 | /* for non-OTG B devices: set transceiver into suspend mode */ |
67 | int (*set_suspend)(struct otg_transceiver *otg, | |
68 | int suspend); | |
69 | ||
1da177e4 LT |
70 | /* for B devices only: start session with A-Host */ |
71 | int (*start_srp)(struct otg_transceiver *otg); | |
72 | ||
73 | /* start or continue HNP role switch */ | |
74 | int (*start_hnp)(struct otg_transceiver *otg); | |
75 | ||
76 | }; | |
77 | ||
78 | ||
79 | /* for board-specific init logic */ | |
80 | extern int otg_set_transceiver(struct otg_transceiver *); | |
81 | ||
82 | ||
83 | /* for usb host and peripheral controller drivers */ | |
84 | extern struct otg_transceiver *otg_get_transceiver(void); | |
85 | ||
86 | static inline int | |
87 | otg_start_hnp(struct otg_transceiver *otg) | |
88 | { | |
89 | return otg->start_hnp(otg); | |
90 | } | |
91 | ||
92 | ||
93 | /* for HCDs */ | |
94 | static inline int | |
95 | otg_set_host(struct otg_transceiver *otg, struct usb_bus *host) | |
96 | { | |
97 | return otg->set_host(otg, host); | |
98 | } | |
99 | ||
100 | ||
101 | /* for usb peripheral controller drivers */ | |
102 | static inline int | |
103 | otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph) | |
104 | { | |
105 | return otg->set_peripheral(otg, periph); | |
106 | } | |
107 | ||
108 | static inline int | |
109 | otg_set_power(struct otg_transceiver *otg, unsigned mA) | |
110 | { | |
111 | return otg->set_power(otg, mA); | |
112 | } | |
113 | ||
4e67185a JY |
114 | static inline int |
115 | otg_set_suspend(struct otg_transceiver *otg, int suspend) | |
116 | { | |
117 | if (otg->set_suspend != NULL) | |
118 | return otg->set_suspend(otg, suspend); | |
119 | else | |
120 | return 0; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static inline int |
124 | otg_start_srp(struct otg_transceiver *otg) | |
125 | { | |
126 | return otg->start_srp(otg); | |
127 | } | |
128 | ||
129 | ||
130 | /* for OTG controller drivers (and maybe other stuff) */ | |
131 | extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num); |