summaryrefslogtreecommitdiffstats
path: root/include/linux/usb/phy.h
blob: e4de6bc1f69b6287cb49882c3235b824bb474d13 (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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * USB PHY 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_PHY_H
#define __LINUX_USB_PHY_H

#include <linux/extcon.h>
#include <linux/notifier.h>
#include <linux/usb.h>
#include <uapi/linux/usb/charger.h>

enum usb_phy_interface {
	USBPHY_INTERFACE_MODE_UNKNOWN,
	USBPHY_INTERFACE_MODE_UTMI,
	USBPHY_INTERFACE_MODE_UTMIW,
	USBPHY_INTERFACE_MODE_ULPI,
	USBPHY_INTERFACE_MODE_SERIAL,
	USBPHY_INTERFACE_MODE_HSIC,
};

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,
};

/* 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,
};

struct usb_phy;
struct usb_otg;

/* for phys 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_charger_current {
	unsigned int sdp_min;
	unsigned int sdp_max;
	unsigned int dcp_min;
	unsigned int dcp_max;
	unsigned int cdp_min;
	unsigned int cdp_max;
	unsigned int aca_min;
	unsigned int aca_max;
};

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

	enum usb_phy_type	type;
	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;

	/* to support extcon device */
	struct extcon_dev	*edev;
	struct extcon_dev	*id_edev;
	struct notifier_block	vbus_nb;
	struct notifier_block	id_nb;
	struct notifier_block	type_nb;

	/* Support USB charger */
	enum usb_charger_type	chg_type;
	enum usb_charger_state	chg_state;
	struct usb_charger_current	chg_cur;
	struct work_struct		chg_work;

	/* 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 phys */
	struct list_head	head;

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

	/* enable/disable VBUS */
	int	(*set_vbus)(struct usb_phy *x, int on);

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

	/* Set phy into suspend mode */
	int	(*set_suspend)(struct usb_phy *x,
				int suspend);

	/*
	 * Set wakeup enable for PHY, in that case, the PHY can be
	 * woken up from suspend status due to external events,
	 * like vbus change, dp/dm change and id.
	 */
	int	(*set_wakeup)(struct usb_phy *x, bool enabled);

	/* notify phy connect status change */
	int	(*notify_connect)(struct usb_phy *x,
			enum usb_device_speed speed);
	int	(*notify_disconnect)(struct usb_phy *x,
			enum usb_device_speed speed);

	/*
	 * Charger detection method can be implemented if you need to
	 * manually detect the charger type.
	 */
	enum usb_charger_type (*charger_detect)(struct usb_phy *x);
};

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

/* helpers for direct access thru low-level io interface */
static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
{
	if (x && 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 && 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 && x->init)
		return x->init(x);

	return 0;
}

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

static inline int
usb_phy_vbus_on(struct usb_phy *x)
{
	if (!x || !x->set_vbus)
		return 0;

	return x->set_vbus(x, true);
}

static inline int
usb_phy_vbus_off(struct usb_phy *x)
{
	if (!x || !x->set_vbus)
		return 0;

	return x->set_vbus(x, false);
}

/* for usb host and peripheral controller drivers */
#if IS_ENABLED(CONFIG_USB_PHY)
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 struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
	const char *phandle, u8 index);
extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
	struct device_node *node, struct notifier_block *nb);
extern void usb_put_phy(struct usb_phy *);
extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
extern void usb_phy_set_event(struct usb_phy *x, unsigned long event);
extern void usb_phy_set_charger_current(struct usb_phy *usb_phy,
					unsigned int mA);
extern void usb_phy_get_charger_current(struct usb_phy *usb_phy,
					unsigned int *min, unsigned int *max);
extern void usb_phy_set_charger_state(struct usb_phy *usb_phy,
				      enum usb_charger_state state);
#else
static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
	return ERR_PTR(-ENXIO);
}

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

static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
	const char *phandle, u8 index)
{
	return ERR_PTR(-ENXIO);
}

static inline struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
	struct device_node *node, struct notifier_block *nb)
{
	return ERR_PTR(-ENXIO);
}

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 void usb_phy_set_event(struct usb_phy *x, unsigned long event)
{
}

static inline void usb_phy_set_charger_current(struct usb_phy *usb_phy,
					       unsigned int mA)
{
}

static inline void usb_phy_get_charger_current(struct usb_phy *usb_phy,
					       unsigned int *min,
					       unsigned int *max)
{
}

static inline void usb_phy_set_charger_state(struct usb_phy *usb_phy,
					     enum usb_charger_state state)
{
}
#endif

static inline int
usb_phy_set_power(struct usb_phy *x, unsigned mA)
{
	if (!x)
		return 0;

	usb_phy_set_charger_current(x, mA);

	if (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 && x->set_suspend != NULL)
		return x->set_suspend(x, suspend);
	else
		return 0;
}

static inline int
usb_phy_set_wakeup(struct usb_phy *x, bool enabled)
{
	if (x && x->set_wakeup)
		return x->set_wakeup(x, enabled);
	else
		return 0;
}

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

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

/* 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);
}

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_PHY_H */