1 /* USB OTG (On The Go) defines */
4 * These APIs may be used between USB controllers. USB device drivers
5 * (for either host or peripheral roles) don't use these calls; they
6 * continue to use just usb_device and usb_gadget.
9 #ifndef __LINUX_USB_OTG_H
10 #define __LINUX_USB_OTG_H
12 #include <linux/notifier.h>
14 /* OTG defines lots of enumeration states before device reset */
16 OTG_STATE_UNDEFINED = 0,
18 /* single-role peripheral, and dual-role default-b */
21 OTG_STATE_B_PERIPHERAL,
23 /* extra dual-role default-b states */
24 OTG_STATE_B_WAIT_ACON,
27 /* dual-role default-a */
29 OTG_STATE_A_WAIT_VRISE,
30 OTG_STATE_A_WAIT_BCON,
33 OTG_STATE_A_PERIPHERAL,
34 OTG_STATE_A_WAIT_VFALL,
38 enum usb_xceiv_events {
39 USB_EVENT_NONE, /* no events or cable disconnected */
40 USB_EVENT_VBUS, /* vbus valid event */
41 USB_EVENT_ID, /* id was grounded */
42 USB_EVENT_CHARGER, /* usb dedicated charger */
43 USB_EVENT_ENUMERATED, /* gadget driver enumerated */
46 struct otg_transceiver;
48 /* for transceivers connected thru an ULPI interface, the user must
51 struct otg_io_access_ops {
52 int (*read)(struct otg_transceiver *otg, u32 reg);
53 int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
57 * the otg driver needs to interact with both device side and host side
58 * usb controllers. it decides which controller is active at a given
59 * moment, using the transceiver, ID signal, HNP and sometimes static
60 * configuration information (including "board isn't wired for otg").
62 struct otg_transceiver {
68 enum usb_otg_state state;
69 enum usb_xceiv_events last_event;
72 struct usb_gadget *gadget;
74 struct device *io_dev;
75 struct otg_io_access_ops *io_ops;
76 void __iomem *io_priv;
78 /* for notification of usb_xceiv_events */
79 struct atomic_notifier_head notifier;
81 /* to pass extra port status to the root hub */
85 /* initialize/shutdown the OTG controller */
86 int (*init)(struct otg_transceiver *otg);
87 void (*shutdown)(struct otg_transceiver *otg);
89 /* bind/unbind the host controller */
90 int (*set_host)(struct otg_transceiver *otg,
91 struct usb_bus *host);
93 /* bind/unbind the peripheral controller */
94 int (*set_peripheral)(struct otg_transceiver *otg,
95 struct usb_gadget *gadget);
97 /* effective for B devices, ignored for A-peripheral */
98 int (*set_power)(struct otg_transceiver *otg,
101 /* effective for A-peripheral, ignored for B devices */
102 int (*set_vbus)(struct otg_transceiver *otg,
105 /* for non-OTG B devices: set transceiver into suspend mode */
106 int (*set_suspend)(struct otg_transceiver *otg,
109 /* for B devices only: start session with A-Host */
110 int (*start_srp)(struct otg_transceiver *otg);
112 /* start or continue HNP role switch */
113 int (*start_hnp)(struct otg_transceiver *otg);
118 /* for board-specific init logic */
119 extern int otg_set_transceiver(struct otg_transceiver *);
121 #if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
122 /* sometimes transceivers are accessed only through e.g. ULPI */
123 extern void usb_nop_xceiv_register(void);
124 extern void usb_nop_xceiv_unregister(void);
126 static inline void usb_nop_xceiv_register(void)
130 static inline void usb_nop_xceiv_unregister(void)
135 /* helpers for direct access thru low-level io interface */
136 static inline int otg_io_read(struct otg_transceiver *otg, u32 reg)
138 if (otg->io_ops && otg->io_ops->read)
139 return otg->io_ops->read(otg, reg);
144 static inline int otg_io_write(struct otg_transceiver *otg, u32 val, u32 reg)
146 if (otg->io_ops && otg->io_ops->write)
147 return otg->io_ops->write(otg, val, reg);
153 otg_init(struct otg_transceiver *otg)
156 return otg->init(otg);
162 otg_shutdown(struct otg_transceiver *otg)
168 /* for usb host and peripheral controller drivers */
169 #ifdef CONFIG_USB_OTG_UTILS
170 extern struct otg_transceiver *otg_get_transceiver(void);
171 extern void otg_put_transceiver(struct otg_transceiver *);
172 extern const char *otg_state_string(enum usb_otg_state state);
174 static inline struct otg_transceiver *otg_get_transceiver(void)
179 static inline void otg_put_transceiver(struct otg_transceiver *x)
183 static inline const char *otg_state_string(enum usb_otg_state state)
189 /* Context: can sleep */
191 otg_start_hnp(struct otg_transceiver *otg)
193 return otg->start_hnp(otg);
196 /* Context: can sleep */
198 otg_set_vbus(struct otg_transceiver *otg, bool enabled)
200 return otg->set_vbus(otg, enabled);
205 otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
207 return otg->set_host(otg, host);
210 /* for usb peripheral controller drivers */
212 /* Context: can sleep */
214 otg_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *periph)
216 return otg->set_peripheral(otg, periph);
220 otg_set_power(struct otg_transceiver *otg, unsigned mA)
222 return otg->set_power(otg, mA);
225 /* Context: can sleep */
227 otg_set_suspend(struct otg_transceiver *otg, int suspend)
229 if (otg->set_suspend != NULL)
230 return otg->set_suspend(otg, suspend);
236 otg_start_srp(struct otg_transceiver *otg)
238 return otg->start_srp(otg);
243 otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
245 return atomic_notifier_chain_register(&otg->notifier, nb);
249 otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
251 atomic_notifier_chain_unregister(&otg->notifier, nb);
254 /* for OTG controller drivers (and maybe other stuff) */
255 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
257 #endif /* __LINUX_USB_OTG_H */