summaryrefslogtreecommitdiffstats
path: root/include/linux/usb/otg.h
blob: e007074ebe41f6b9648f62177cfa588b7bc13fcb (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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* USB OTG (On The Go) defines */

/*
 * These APIs may be used between USB controllers.  USB device drivers
 * (for either host or peripheral roles) don't use these calls; they
 * continue to use just usb_device and usb_gadget.
 */


/* OTG defines lots of enumeration states before device reset */
enum usb_otg_state {
	OTG_STATE_UNDEFINED = 0,

	/* single-role peripheral, and dual-role default-b */
	OTG_STATE_B_IDLE,
	OTG_STATE_B_SRP_INIT,
	OTG_STATE_B_PERIPHERAL,

	/* extra dual-role default-b states */
	OTG_STATE_B_WAIT_ACON,
	OTG_STATE_B_HOST,

	/* dual-role default-a */
	OTG_STATE_A_IDLE,
	OTG_STATE_A_WAIT_VRISE,
	OTG_STATE_A_WAIT_BCON,
	OTG_STATE_A_HOST,
	OTG_STATE_A_SUSPEND,
	OTG_STATE_A_PERIPHERAL,
	OTG_STATE_A_WAIT_VFALL,
	OTG_STATE_A_VBUS_ERR,
};

/*
 * the otg driver needs to interact with both device side and host side
 * usb controllers.  it decides which controller is active at a given
 * moment, using the transceiver, ID signal, HNP and sometimes static
 * configuration information (including "board isn't wired for otg").
 */
struct otg_transceiver {
	struct device		*dev;
	const char		*label;

	u8			default_a;
	enum usb_otg_state	state;

	struct usb_bus		*host;
	struct usb_gadget	*gadget;

	/* to pass extra port status to the root hub */
	u16			port_status;
	u16			port_change;

	/* bind/unbind the host controller */
	int	(*set_host)(struct otg_transceiver *otg,
				struct usb_bus *host);

	/* bind/unbind the peripheral controller */
	int	(*set_peripheral)(struct otg_transceiver *otg,
				struct usb_gadget *gadget);

	/* effective for B devices, ignored for A-peripheral */
	int	(*set_power)(struct otg_transceiver *otg,
				unsigned mA);

	/* for non-OTG B devices: set transceiver into suspend mode */
	int	(*set_suspend)(struct otg_transceiver *otg,
				int suspend);

	/* for B devices only:  start session with A-Host */
	int	(*start_srp)(struct otg_transceiver *otg);

	/* start or continue HNP role switch */
	int	(*start_hnp)(struct otg_transceiver *otg);

};


/* for board-specific init logic */
extern int otg_set_transceiver(struct otg_transceiver *);


/* for usb host and peripheral controller drivers */
extern struct otg_transceiver *otg_get_transceiver(void);

static inline int
otg_start_hnp(struct otg_transceiver *otg)
{
	return otg->start_hnp(otg);
}


/* for HCDs */
static inline int
otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
{
	return otg->set_host(otg, host);
}


/* for usb peripheral controller drivers */
static inline int
otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
{
	return otg->set_peripheral(otg, periph);
}

static inline int
otg_set_power(struct otg_transceiver *otg, unsigned mA)
{
	return otg->set_power(otg, mA);
}

static inline int
otg_set_suspend(struct otg_transceiver *otg, int suspend)
{
	if (otg->set_suspend != NULL)
		return otg->set_suspend(otg, suspend);
	else
		return 0;
}

static inline int
otg_start_srp(struct otg_transceiver *otg)
{
	return otg->start_srp(otg);
}


/* for OTG controller drivers (and maybe other stuff) */
extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
OpenPOWER on IntegriCloud