326 lines
7.4 KiB
C
326 lines
7.4 KiB
C
/* USB OTG (On The Go) defines */
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/*
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*
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* These APIs may be used between USB controllers. USB device drivers
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* (for either host or peripheral roles) don't use these calls; they
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* continue to use just usb_device and usb_gadget.
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*/
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#ifndef __LINUX_USB_PHY_H
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#define __LINUX_USB_PHY_H
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#include <linux/notifier.h>
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#include <linux/usb.h>
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enum usb_phy_interface {
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USBPHY_INTERFACE_MODE_UNKNOWN,
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USBPHY_INTERFACE_MODE_UTMI,
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USBPHY_INTERFACE_MODE_UTMIW,
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USBPHY_INTERFACE_MODE_ULPI,
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USBPHY_INTERFACE_MODE_SERIAL,
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USBPHY_INTERFACE_MODE_HSIC,
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};
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enum usb_phy_events {
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USB_EVENT_NONE, /* no events or cable disconnected */
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USB_EVENT_VBUS, /* vbus valid event */
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USB_EVENT_ID, /* id was grounded */
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USB_EVENT_CHARGER, /* usb dedicated charger */
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USB_EVENT_ENUMERATED, /* gadget driver enumerated */
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};
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/* associate a type with PHY */
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enum usb_phy_type {
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USB_PHY_TYPE_UNDEFINED,
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USB_PHY_TYPE_USB2,
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USB_PHY_TYPE_USB3,
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};
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/* OTG defines lots of enumeration states before device reset */
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enum usb_otg_state {
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OTG_STATE_UNDEFINED = 0,
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/* single-role peripheral, and dual-role default-b */
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OTG_STATE_B_IDLE,
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OTG_STATE_B_SRP_INIT,
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OTG_STATE_B_PERIPHERAL,
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/* extra dual-role default-b states */
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OTG_STATE_B_WAIT_ACON,
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OTG_STATE_B_HOST,
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/* dual-role default-a */
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OTG_STATE_A_IDLE,
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OTG_STATE_A_WAIT_VRISE,
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OTG_STATE_A_WAIT_BCON,
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OTG_STATE_A_HOST,
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OTG_STATE_A_SUSPEND,
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OTG_STATE_A_PERIPHERAL,
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OTG_STATE_A_WAIT_VFALL,
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OTG_STATE_A_VBUS_ERR,
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};
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struct usb_phy;
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struct usb_otg;
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/* for transceivers connected thru an ULPI interface, the user must
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* provide access ops
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*/
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struct usb_phy_io_ops {
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int (*read)(struct usb_phy *x, u32 reg);
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int (*write)(struct usb_phy *x, u32 val, u32 reg);
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};
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struct usb_phy {
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struct device *dev;
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const char *label;
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unsigned int flags;
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enum usb_phy_type type;
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enum usb_otg_state state;
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enum usb_phy_events last_event;
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struct usb_otg *otg;
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struct device *io_dev;
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struct usb_phy_io_ops *io_ops;
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void __iomem *io_priv;
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/* for notification of usb_phy_events */
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struct atomic_notifier_head notifier;
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/* to pass extra port status to the root hub */
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u16 port_status;
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u16 port_change;
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/* to support controllers that have multiple transceivers */
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struct list_head head;
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/* initialize/shutdown the OTG controller */
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int (*init)(struct usb_phy *x);
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void (*shutdown)(struct usb_phy *x);
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/* enable/disable VBUS */
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int (*set_vbus)(struct usb_phy *x, int on);
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/* effective for B devices, ignored for A-peripheral */
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int (*set_power)(struct usb_phy *x,
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unsigned mA);
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/* for non-OTG B devices: set transceiver into suspend mode */
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int (*set_suspend)(struct usb_phy *x,
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int suspend);
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/*
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* Set wakeup enable for PHY, in that case, the PHY can be
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* woken up from suspend status due to external events,
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* like vbus change, dp/dm change and id.
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*/
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int (*set_wakeup)(struct usb_phy *x, bool enabled);
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/* notify phy connect status change */
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int (*notify_connect)(struct usb_phy *x,
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enum usb_device_speed speed);
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int (*notify_disconnect)(struct usb_phy *x,
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enum usb_device_speed speed);
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};
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/**
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* struct usb_phy_bind - represent the binding for the phy
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* @dev_name: the device name of the device that will bind to the phy
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* @phy_dev_name: the device name of the phy
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* @index: used if a single controller uses multiple phys
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* @phy: reference to the phy
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* @list: to maintain a linked list of the binding information
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*/
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struct usb_phy_bind {
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const char *dev_name;
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const char *phy_dev_name;
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u8 index;
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struct usb_phy *phy;
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struct list_head list;
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};
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/* for board-specific init logic */
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extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
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extern int usb_add_phy_dev(struct usb_phy *);
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extern void usb_remove_phy(struct usb_phy *);
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/* helpers for direct access thru low-level io interface */
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static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
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{
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if (x && x->io_ops && x->io_ops->read)
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return x->io_ops->read(x, reg);
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return -EINVAL;
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}
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static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
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{
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if (x && x->io_ops && x->io_ops->write)
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return x->io_ops->write(x, val, reg);
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return -EINVAL;
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}
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static inline int
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usb_phy_init(struct usb_phy *x)
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{
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if (x && x->init)
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return x->init(x);
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return 0;
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}
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static inline void
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usb_phy_shutdown(struct usb_phy *x)
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{
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if (x && x->shutdown)
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x->shutdown(x);
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}
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static inline int
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usb_phy_vbus_on(struct usb_phy *x)
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{
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if (!x || !x->set_vbus)
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return 0;
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return x->set_vbus(x, true);
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}
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static inline int
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usb_phy_vbus_off(struct usb_phy *x)
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{
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if (!x || !x->set_vbus)
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return 0;
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return x->set_vbus(x, false);
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}
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/* for usb host and peripheral controller drivers */
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#if IS_ENABLED(CONFIG_USB_PHY)
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extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
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extern struct usb_phy *devm_usb_get_phy(struct device *dev,
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enum usb_phy_type type);
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extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index);
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extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index);
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extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index);
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extern void usb_put_phy(struct usb_phy *);
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extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
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extern int usb_bind_phy(const char *dev_name, u8 index,
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const char *phy_dev_name);
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#else
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static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
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{
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return ERR_PTR(-ENXIO);
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}
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static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
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enum usb_phy_type type)
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{
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return ERR_PTR(-ENXIO);
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}
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static inline struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
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{
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return ERR_PTR(-ENXIO);
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}
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static inline struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
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{
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return ERR_PTR(-ENXIO);
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}
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static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index)
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{
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return ERR_PTR(-ENXIO);
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}
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static inline void usb_put_phy(struct usb_phy *x)
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{
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}
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static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x)
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{
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}
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static inline int usb_bind_phy(const char *dev_name, u8 index,
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const char *phy_dev_name)
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{
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return -EOPNOTSUPP;
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}
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#endif
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static inline int
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usb_phy_set_power(struct usb_phy *x, unsigned mA)
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{
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if (x && x->set_power)
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return x->set_power(x, mA);
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return 0;
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}
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/* Context: can sleep */
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static inline int
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usb_phy_set_suspend(struct usb_phy *x, int suspend)
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{
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if (x && x->set_suspend != NULL)
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return x->set_suspend(x, suspend);
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else
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return 0;
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}
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static inline int
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usb_phy_set_wakeup(struct usb_phy *x, bool enabled)
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{
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if (x && x->set_wakeup)
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return x->set_wakeup(x, enabled);
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else
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return 0;
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}
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static inline int
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usb_phy_notify_connect(struct usb_phy *x, enum usb_device_speed speed)
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{
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if (x && x->notify_connect)
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return x->notify_connect(x, speed);
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else
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return 0;
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}
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static inline int
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usb_phy_notify_disconnect(struct usb_phy *x, enum usb_device_speed speed)
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{
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if (x && x->notify_disconnect)
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return x->notify_disconnect(x, speed);
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else
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return 0;
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}
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/* notifiers */
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static inline int
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usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&x->notifier, nb);
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}
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static inline void
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usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
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{
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atomic_notifier_chain_unregister(&x->notifier, nb);
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}
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static inline const char *usb_phy_type_string(enum usb_phy_type type)
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{
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switch (type) {
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case USB_PHY_TYPE_USB2:
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return "USB2 PHY";
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case USB_PHY_TYPE_USB3:
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return "USB3 PHY";
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default:
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return "UNKNOWN PHY TYPE";
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}
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}
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#endif /* __LINUX_USB_PHY_H */
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