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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/* 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.
*/
#ifndef __LINUX_USB_OTG_H
#define __LINUX_USB_OTG_H
#include <linux/notifier.h>
/* 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,
};
enum usb_xceiv_events {
USB_EVENT_NONE, /* no events or cable disconnected */
USB_EVENT_VBUS, /* vbus valid event */
USB_EVENT_ID, /* id was grounded */
USB_EVENT_CHARGER, /* usb dedicated charger */
USB_EVENT_ENUMERATED, /* gadget driver enumerated */
};
struct otg_transceiver;
/* for transceivers connected thru an ULPI interface, the user must
* provide access ops
*/
struct otg_io_access_ops {
int (*read)(struct otg_transceiver *otg, u32 reg);
int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
};
/*
* 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;
unsigned int flags;
u8 default_a;
enum usb_otg_state state;
struct usb_bus *host;
struct usb_gadget *gadget;
struct otg_io_access_ops *io_ops;
void __iomem *io_priv;
/* for notification of usb_xceiv_events */
struct blocking_notifier_head notifier;
/* to pass extra port status to the root hub */
u16 port_status;
u16 port_change;
/* initialize/shutdown the OTG controller */
int (*init)(struct otg_transceiver *otg);
void (*shutdown)(struct otg_transceiver *otg);
/* 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);
/* effective for A-peripheral, ignored for B devices */
int (*set_vbus)(struct otg_transceiver *otg,
bool enabled);
/* 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 *);
#if defined(CONFIG_NOP_USB_XCEIV) || defined(CONFIG_NOP_USB_XCEIV_MODULE)
/* sometimes transceivers are accessed only through e.g. ULPI */
extern void usb_nop_xceiv_register(void);
extern void usb_nop_xceiv_unregister(void);
#else
static inline void usb_nop_xceiv_register(void)
{
}
static inline void usb_nop_xceiv_unregister(void)
{
}
#endif
/* helpers for direct access thru low-level io interface */
static inline int otg_io_read(struct otg_transceiver *otg, u32 reg)
{
if (otg->io_ops && otg->io_ops->read)
return otg->io_ops->read(otg, reg);
return -EINVAL;
}
static inline int otg_io_write(struct otg_transceiver *otg, u32 val, u32 reg)
{
if (otg->io_ops && otg->io_ops->write)
return otg->io_ops->write(otg, val, reg);
return -EINVAL;
}
static inline int
otg_init(struct otg_transceiver *otg)
{
if (otg->init)
return otg->init(otg);
return 0;
}
static inline void
otg_shutdown(struct otg_transceiver *otg)
{
if (otg->shutdown)
otg->shutdown(otg);
}
/* for usb host and peripheral controller drivers */
#ifdef CONFIG_USB_OTG_UTILS
extern struct otg_transceiver *otg_get_transceiver(void);
extern void otg_put_transceiver(struct otg_transceiver *);
#else
static inline struct otg_transceiver *otg_get_transceiver(void)
{
return NULL;
}
static inline void otg_put_transceiver(struct otg_transceiver *x)
{
}
#endif
/* Context: can sleep */
static inline int
otg_start_hnp(struct otg_transceiver *otg)
{
return otg->start_hnp(otg);
}
/* Context: can sleep */
static inline int
otg_set_vbus(struct otg_transceiver *otg, bool enabled)
{
return otg->set_vbus(otg, enabled);
}
/* 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 */
/* Context: can sleep */
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);
}
/* Context: can sleep */
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);
}
/* notifiers */
static inline int
otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
{
return blocking_notifier_chain_register(&otg->notifier, nb);
}
static inline void
otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&otg->notifier, nb);
}
/* for OTG controller drivers (and maybe other stuff) */
extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
#endif /* __LINUX_USB_OTG_H */
|
