xref: /linux/include/linux/usb/phy.h (revision cc8b10fa70682218c2a318fc44f71f3175a23cc0)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * USB PHY defines
4  *
5  * These APIs may be used between USB controllers.  USB device drivers
6  * (for either host or peripheral roles) don't use these calls; they
7  * continue to use just usb_device and usb_gadget.
8  */
9 
10 #ifndef __LINUX_USB_PHY_H
11 #define __LINUX_USB_PHY_H
12 
13 #include <linux/extcon.h>
14 #include <linux/notifier.h>
15 #include <linux/usb.h>
16 #include <uapi/linux/usb/charger.h>
17 
18 enum usb_phy_interface {
19 	USBPHY_INTERFACE_MODE_UNKNOWN,
20 	USBPHY_INTERFACE_MODE_UTMI,
21 	USBPHY_INTERFACE_MODE_UTMIW,
22 	USBPHY_INTERFACE_MODE_ULPI,
23 	USBPHY_INTERFACE_MODE_SERIAL,
24 	USBPHY_INTERFACE_MODE_HSIC,
25 };
26 
27 enum usb_phy_events {
28 	USB_EVENT_NONE,         /* no events or cable disconnected */
29 	USB_EVENT_VBUS,         /* vbus valid event */
30 	USB_EVENT_ID,           /* id was grounded */
31 	USB_EVENT_CHARGER,      /* usb dedicated charger */
32 	USB_EVENT_ENUMERATED,   /* gadget driver enumerated */
33 };
34 
35 /* associate a type with PHY */
36 enum usb_phy_type {
37 	USB_PHY_TYPE_UNDEFINED,
38 	USB_PHY_TYPE_USB2,
39 	USB_PHY_TYPE_USB3,
40 };
41 
42 /* OTG defines lots of enumeration states before device reset */
43 enum usb_otg_state {
44 	OTG_STATE_UNDEFINED = 0,
45 
46 	/* single-role peripheral, and dual-role default-b */
47 	OTG_STATE_B_IDLE,
48 	OTG_STATE_B_SRP_INIT,
49 	OTG_STATE_B_PERIPHERAL,
50 
51 	/* extra dual-role default-b states */
52 	OTG_STATE_B_WAIT_ACON,
53 	OTG_STATE_B_HOST,
54 
55 	/* dual-role default-a */
56 	OTG_STATE_A_IDLE,
57 	OTG_STATE_A_WAIT_VRISE,
58 	OTG_STATE_A_WAIT_BCON,
59 	OTG_STATE_A_HOST,
60 	OTG_STATE_A_SUSPEND,
61 	OTG_STATE_A_PERIPHERAL,
62 	OTG_STATE_A_WAIT_VFALL,
63 	OTG_STATE_A_VBUS_ERR,
64 };
65 
66 struct usb_phy;
67 struct usb_otg;
68 
69 /* for phys connected thru an ULPI interface, the user must
70  * provide access ops
71  */
72 struct usb_phy_io_ops {
73 	int (*read)(struct usb_phy *x, u32 reg);
74 	int (*write)(struct usb_phy *x, u32 val, u32 reg);
75 };
76 
77 struct usb_charger_current {
78 	unsigned int sdp_min;
79 	unsigned int sdp_max;
80 	unsigned int dcp_min;
81 	unsigned int dcp_max;
82 	unsigned int cdp_min;
83 	unsigned int cdp_max;
84 	unsigned int aca_min;
85 	unsigned int aca_max;
86 };
87 
88 struct usb_phy {
89 	struct device		*dev;
90 	const char		*label;
91 	unsigned int		 flags;
92 
93 	enum usb_phy_type	type;
94 	enum usb_phy_events	last_event;
95 
96 	struct usb_otg		*otg;
97 
98 	struct device		*io_dev;
99 	struct usb_phy_io_ops	*io_ops;
100 	void __iomem		*io_priv;
101 
102 	/* to support extcon device */
103 	struct extcon_dev	*edev;
104 	struct extcon_dev	*id_edev;
105 	struct notifier_block	vbus_nb;
106 	struct notifier_block	id_nb;
107 	struct notifier_block	type_nb;
108 
109 	/* Support USB charger */
110 	enum usb_charger_type	chg_type;
111 	enum usb_charger_state	chg_state;
112 	struct usb_charger_current	chg_cur;
113 	struct work_struct		chg_work;
114 
115 	/* for notification of usb_phy_events */
116 	struct atomic_notifier_head	notifier;
117 
118 	/* to pass extra port status to the root hub */
119 	u16			port_status;
120 	u16			port_change;
121 
122 	/* to support controllers that have multiple phys */
123 	struct list_head	head;
124 
125 	/* initialize/shutdown the phy */
126 	int	(*init)(struct usb_phy *x);
127 	void	(*shutdown)(struct usb_phy *x);
128 
129 	/* enable/disable VBUS */
130 	int	(*set_vbus)(struct usb_phy *x, int on);
131 
132 	/* effective for B devices, ignored for A-peripheral */
133 	int	(*set_power)(struct usb_phy *x,
134 				unsigned mA);
135 
136 	/* Set phy into suspend mode */
137 	int	(*set_suspend)(struct usb_phy *x,
138 				int suspend);
139 
140 	/*
141 	 * Set wakeup enable for PHY, in that case, the PHY can be
142 	 * woken up from suspend status due to external events,
143 	 * like vbus change, dp/dm change and id.
144 	 */
145 	int	(*set_wakeup)(struct usb_phy *x, bool enabled);
146 
147 	/* notify phy connect status change */
148 	int	(*notify_connect)(struct usb_phy *x,
149 			enum usb_device_speed speed);
150 	int	(*notify_disconnect)(struct usb_phy *x,
151 			enum usb_device_speed speed);
152 
153 	/*
154 	 * Charger detection method can be implemented if you need to
155 	 * manually detect the charger type.
156 	 */
157 	enum usb_charger_type (*charger_detect)(struct usb_phy *x);
158 };
159 
160 /* for board-specific init logic */
161 extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
162 extern int usb_add_phy_dev(struct usb_phy *);
163 extern void usb_remove_phy(struct usb_phy *);
164 
165 /* helpers for direct access thru low-level io interface */
166 static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
167 {
168 	if (x && x->io_ops && x->io_ops->read)
169 		return x->io_ops->read(x, reg);
170 
171 	return -EINVAL;
172 }
173 
174 static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
175 {
176 	if (x && x->io_ops && x->io_ops->write)
177 		return x->io_ops->write(x, val, reg);
178 
179 	return -EINVAL;
180 }
181 
182 static inline int
183 usb_phy_init(struct usb_phy *x)
184 {
185 	if (x && x->init)
186 		return x->init(x);
187 
188 	return 0;
189 }
190 
191 static inline void
192 usb_phy_shutdown(struct usb_phy *x)
193 {
194 	if (x && x->shutdown)
195 		x->shutdown(x);
196 }
197 
198 static inline int
199 usb_phy_vbus_on(struct usb_phy *x)
200 {
201 	if (!x || !x->set_vbus)
202 		return 0;
203 
204 	return x->set_vbus(x, true);
205 }
206 
207 static inline int
208 usb_phy_vbus_off(struct usb_phy *x)
209 {
210 	if (!x || !x->set_vbus)
211 		return 0;
212 
213 	return x->set_vbus(x, false);
214 }
215 
216 /* for usb host and peripheral controller drivers */
217 #if IS_ENABLED(CONFIG_USB_PHY)
218 extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
219 extern struct usb_phy *devm_usb_get_phy(struct device *dev,
220 	enum usb_phy_type type);
221 extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
222 	const char *phandle, u8 index);
223 extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
224 	struct device_node *node, struct notifier_block *nb);
225 extern void usb_put_phy(struct usb_phy *);
226 extern void usb_phy_set_event(struct usb_phy *x, unsigned long event);
227 extern void usb_phy_set_charger_current(struct usb_phy *usb_phy,
228 					unsigned int mA);
229 extern void usb_phy_get_charger_current(struct usb_phy *usb_phy,
230 					unsigned int *min, unsigned int *max);
231 extern void usb_phy_set_charger_state(struct usb_phy *usb_phy,
232 				      enum usb_charger_state state);
233 #else
234 static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
235 {
236 	return ERR_PTR(-ENXIO);
237 }
238 
239 static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
240 	enum usb_phy_type type)
241 {
242 	return ERR_PTR(-ENXIO);
243 }
244 
245 static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
246 	const char *phandle, u8 index)
247 {
248 	return ERR_PTR(-ENXIO);
249 }
250 
251 static inline struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
252 	struct device_node *node, struct notifier_block *nb)
253 {
254 	return ERR_PTR(-ENXIO);
255 }
256 
257 static inline void usb_put_phy(struct usb_phy *x)
258 {
259 }
260 
261 static inline void usb_phy_set_event(struct usb_phy *x, unsigned long event)
262 {
263 }
264 
265 static inline void usb_phy_set_charger_current(struct usb_phy *usb_phy,
266 					       unsigned int mA)
267 {
268 }
269 
270 static inline void usb_phy_get_charger_current(struct usb_phy *usb_phy,
271 					       unsigned int *min,
272 					       unsigned int *max)
273 {
274 }
275 
276 static inline void usb_phy_set_charger_state(struct usb_phy *usb_phy,
277 					     enum usb_charger_state state)
278 {
279 }
280 #endif
281 
282 static inline int
283 usb_phy_set_power(struct usb_phy *x, unsigned mA)
284 {
285 	if (!x)
286 		return 0;
287 
288 	usb_phy_set_charger_current(x, mA);
289 
290 	if (x->set_power)
291 		return x->set_power(x, mA);
292 	return 0;
293 }
294 
295 /* Context: can sleep */
296 static inline int
297 usb_phy_set_suspend(struct usb_phy *x, int suspend)
298 {
299 	if (x && x->set_suspend != NULL)
300 		return x->set_suspend(x, suspend);
301 	else
302 		return 0;
303 }
304 
305 static inline int
306 usb_phy_set_wakeup(struct usb_phy *x, bool enabled)
307 {
308 	if (x && x->set_wakeup)
309 		return x->set_wakeup(x, enabled);
310 	else
311 		return 0;
312 }
313 
314 static inline int
315 usb_phy_notify_connect(struct usb_phy *x, enum usb_device_speed speed)
316 {
317 	if (x && x->notify_connect)
318 		return x->notify_connect(x, speed);
319 	else
320 		return 0;
321 }
322 
323 static inline int
324 usb_phy_notify_disconnect(struct usb_phy *x, enum usb_device_speed speed)
325 {
326 	if (x && x->notify_disconnect)
327 		return x->notify_disconnect(x, speed);
328 	else
329 		return 0;
330 }
331 
332 /* notifiers */
333 static inline int
334 usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
335 {
336 	return atomic_notifier_chain_register(&x->notifier, nb);
337 }
338 
339 static inline void
340 usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
341 {
342 	atomic_notifier_chain_unregister(&x->notifier, nb);
343 }
344 
345 static inline const char *usb_phy_type_string(enum usb_phy_type type)
346 {
347 	switch (type) {
348 	case USB_PHY_TYPE_USB2:
349 		return "USB2 PHY";
350 	case USB_PHY_TYPE_USB3:
351 		return "USB3 PHY";
352 	default:
353 		return "UNKNOWN PHY TYPE";
354 	}
355 }
356 #endif /* __LINUX_USB_PHY_H */
357