aboutsummaryrefslogtreecommitdiff
path: root/include/linux/usb/otg.h
blob: 45824be0a2f9e01b09d80b405f390bd27f2fdbcc (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
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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
/* 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_phy_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 */
};

/* associate a type with PHY */
enum usb_phy_type {
	USB_PHY_TYPE_UNDEFINED,
	USB_PHY_TYPE_USB2,
	USB_PHY_TYPE_USB3,
};

struct usb_phy;

/* for transceivers connected thru an ULPI interface, the user must
 * provide access ops
 */
struct usb_phy_io_ops {
	int (*read)(struct usb_phy *x, u32 reg);
	int (*write)(struct usb_phy *x, u32 val, u32 reg);
};

struct usb_otg {
	u8			default_a;

	struct usb_phy		*phy;
	struct usb_bus		*host;
	struct usb_gadget	*gadget;

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

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

	/* effective for A-peripheral, ignored for B devices */
	int	(*set_vbus)(struct usb_otg *otg, bool enabled);

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

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

};

/*
 * 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 usb_phy {
	struct device		*dev;
	const char		*label;
	unsigned int		 flags;

	enum usb_phy_type	type;
	enum usb_otg_state	state;
	enum usb_phy_events	last_event;

	struct usb_otg		*otg;

	struct device		*io_dev;
	struct usb_phy_io_ops	*io_ops;
	void __iomem		*io_priv;

	/* for notification of usb_phy_events */
	struct atomic_notifier_head	notifier;

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

	/* to support controllers that have multiple transceivers */
	struct list_head	head;

	/* initialize/shutdown the OTG controller */
	int	(*init)(struct usb_phy *x);
	void	(*shutdown)(struct usb_phy *x);

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

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

	/* notify phy connect status change */
	int	(*notify_connect)(struct usb_phy *x, int port);
	int	(*notify_disconnect)(struct usb_phy *x, int port);
};


/* for board-specific init logic */
extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
extern void usb_remove_phy(struct usb_phy *);

#if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(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 usb_phy_io_read(struct usb_phy *x, u32 reg)
{
	if (x->io_ops && x->io_ops->read)
		return x->io_ops->read(x, reg);

	return -EINVAL;
}

static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
{
	if (x->io_ops && x->io_ops->write)
		return x->io_ops->write(x, val, reg);

	return -EINVAL;
}

static inline int
usb_phy_init(struct usb_phy *x)
{
	if (x->init)
		return x->init(x);

	return 0;
}

static inline void
usb_phy_shutdown(struct usb_phy *x)
{
	if (x->shutdown)
		x->shutdown(x);
}

/* for usb host and peripheral controller drivers */
#ifdef CONFIG_USB_OTG_UTILS
extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
extern struct usb_phy *devm_usb_get_phy(struct device *dev,
	enum usb_phy_type type);
extern void usb_put_phy(struct usb_phy *);
extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
extern const char *otg_state_string(enum usb_otg_state state);
#else
static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
	return NULL;
}

static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
	enum usb_phy_type type)
{
	return NULL;
}

static inline void usb_put_phy(struct usb_phy *x)
{
}

static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x)
{
}

static inline const char *otg_state_string(enum usb_otg_state state)
{
	return NULL;
}
#endif

/* Context: can sleep */
static inline int
otg_start_hnp(struct usb_otg *otg)
{
	if (otg && otg->start_hnp)
		return otg->start_hnp(otg);

	return -ENOTSUPP;
}

/* Context: can sleep */
static inline int
otg_set_vbus(struct usb_otg *otg, bool enabled)
{
	if (otg && otg->set_vbus)
		return otg->set_vbus(otg, enabled);

	return -ENOTSUPP;
}

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

	return -ENOTSUPP;
}

/* for usb peripheral controller drivers */

/* Context: can sleep */
static inline int
otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph)
{
	if (otg && otg->set_peripheral)
		return otg->set_peripheral(otg, periph);

	return -ENOTSUPP;
}

static inline int
usb_phy_set_power(struct usb_phy *x, unsigned mA)
{
	if (x && x->set_power)
		return x->set_power(x, mA);
	return 0;
}

/* Context: can sleep */
static inline int
usb_phy_set_suspend(struct usb_phy *x, int suspend)
{
	if (x->set_suspend != NULL)
		return x->set_suspend(x, suspend);
	else
		return 0;
}

static inline int
usb_phy_notify_connect(struct usb_phy *x, int port)
{
	if (x->notify_connect)
		return x->notify_connect(x, port);
	else
		return 0;
}

static inline int
usb_phy_notify_disconnect(struct usb_phy *x, int port)
{
	if (x->notify_disconnect)
		return x->notify_disconnect(x, port);
	else
		return 0;
}

static inline int
otg_start_srp(struct usb_otg *otg)
{
	if (otg && otg->start_srp)
		return otg->start_srp(otg);

	return -ENOTSUPP;
}

/* notifiers */
static inline int
usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&x->notifier, nb);
}

static inline void
usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
{
	atomic_notifier_chain_unregister(&x->notifier, nb);
}

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

static inline const char *usb_phy_type_string(enum usb_phy_type type)
{
	switch (type) {
	case USB_PHY_TYPE_USB2:
		return "USB2 PHY";
	case USB_PHY_TYPE_USB3:
		return "USB3 PHY";
	default:
		return "UNKNOWN PHY TYPE";
	}
}
#endif /* __LINUX_USB_OTG_H */