/* 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);
};
/**
* struct usb_phy_bind - represent the binding for the phy
* @dev_name: the device name of the device that will bind to the phy
* @phy_dev_name: the device name of the phy
* @index: used if a single controller uses multiple phys
* @phy: reference to the phy
* @list: to maintain a linked list of the binding information
*/
struct usb_phy_bind {
const char *dev_name;
const char *phy_dev_name;
u8 index;
struct usb_phy *phy;
struct list_head list;
};
/* 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 *usb_get_phy_dev(struct device *dev, u8 index);
extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index);
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 int usb_bind_phy(const char *dev_name, u8 index,
const char *phy_dev_name);
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 *usb_get_phy_dev(struct device *dev, u8 index)
{
return ERR_PTR(-ENXIO);
}
static inline struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
{
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 int usb_bind_phy(const char *dev_name, u8 index,
const char *phy_dev_name)
{
return -EOPNOTSUPP;
}
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 */