127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef __LINUX_USB_ROLE_H
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#define __LINUX_USB_ROLE_H
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#include <linux/device.h>
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struct usb_role_switch;
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enum usb_role {
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USB_ROLE_NONE,
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USB_ROLE_HOST,
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USB_ROLE_DEVICE,
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};
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typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
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enum usb_role role);
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typedef enum usb_role (*usb_role_switch_get_t)(struct usb_role_switch *sw);
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/**
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* struct usb_role_switch_desc - USB Role Switch Descriptor
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* @fwnode: The device node to be associated with the role switch
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* @usb2_port: Optional reference to the host controller port device (USB2)
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* @usb3_port: Optional reference to the host controller port device (USB3)
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* @udc: Optional reference to the peripheral controller device
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* @set: Callback for setting the role
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* @get: Callback for getting the role (optional)
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* @allow_userspace_control: If true userspace may change the role through sysfs
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* @driver_data: Private data pointer
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* @name: Name for the switch (optional)
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*
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* @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
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* device controller behind the USB connector with the role switch. If
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* @usb2_port, @usb3_port and @udc are included in the description, the
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* reference count for them should be incremented by the caller of
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* usb_role_switch_register() before registering the switch.
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*/
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struct usb_role_switch_desc {
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struct fwnode_handle *fwnode;
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struct device *usb2_port;
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struct device *usb3_port;
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struct device *udc;
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usb_role_switch_set_t set;
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usb_role_switch_get_t get;
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bool allow_userspace_control;
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void *driver_data;
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const char *name;
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};
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#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
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int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
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enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
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struct usb_role_switch *usb_role_switch_get(struct device *dev);
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struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *node);
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void usb_role_switch_put(struct usb_role_switch *sw);
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struct usb_role_switch *
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usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode);
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struct usb_role_switch *
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usb_role_switch_register(struct device *parent,
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const struct usb_role_switch_desc *desc);
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void usb_role_switch_unregister(struct usb_role_switch *sw);
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void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data);
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void *usb_role_switch_get_drvdata(struct usb_role_switch *sw);
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const char *usb_role_string(enum usb_role role);
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#else
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static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
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enum usb_role role)
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{
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return 0;
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}
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static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
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{
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return USB_ROLE_NONE;
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}
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static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline struct usb_role_switch *
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fwnode_usb_role_switch_get(struct fwnode_handle *node)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
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static inline struct usb_role_switch *
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usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
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{
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return NULL;
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}
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static inline struct usb_role_switch *
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usb_role_switch_register(struct device *parent,
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const struct usb_role_switch_desc *desc)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
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static inline void
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usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
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{
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}
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static inline void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
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{
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return NULL;
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}
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static inline const char *usb_role_string(enum usb_role role)
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{
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return "unknown";
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}
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#endif
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#endif /* __LINUX_USB_ROLE_H */
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