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/* 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;
enum usb_xceiv_events last_event;
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 atomic_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) && 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 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 *);
extern const char *otg_state_string(enum usb_otg_state state);
#else
static inline struct otg_transceiver *otg_get_transceiver(void)
{
return NULL;
}
static inline void otg_put_transceiver(struct otg_transceiver *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 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 atomic_notifier_chain_register(&otg->notifier, nb);
}
static inline void
otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
{
atomic_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 */
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