/* 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 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 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 */