// SPDX-License-Identifier: GPL-2.0 #ifndef __LINUX_USB_ROLE_H #define __LINUX_USB_ROLE_H #include <linux/device.h> struct usb_role_switch; enum usb_role { USB_ROLE_NONE, USB_ROLE_HOST, USB_ROLE_DEVICE, }; typedef int (*usb_role_switch_set_t)(struct device *dev, enum usb_role role); typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev); /** * struct usb_role_switch_desc - USB Role Switch Descriptor * @usb2_port: Optional reference to the host controller port device (USB2) * @usb3_port: Optional reference to the host controller port device (USB3) * @udc: Optional reference to the peripheral controller device * @set: Callback for setting the role * @get: Callback for getting the role (optional) * @allow_userspace_control: If true userspace may change the role through sysfs * * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB * device controller behind the USB connector with the role switch. If * @usb2_port, @usb3_port and @udc are included in the description, the * reference count for them should be incremented by the caller of * usb_role_switch_register() before registering the switch. */ struct usb_role_switch_desc { struct device *usb2_port; struct device *usb3_port; struct device *udc; usb_role_switch_set_t set; usb_role_switch_get_t get; bool allow_userspace_control; }; int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role); enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw); struct usb_role_switch *usb_role_switch_get(struct device *dev); void usb_role_switch_put(struct usb_role_switch *sw); struct usb_role_switch * usb_role_switch_register(struct device *parent, const struct usb_role_switch_desc *desc); void usb_role_switch_unregister(struct usb_role_switch *sw); #endif /* __LINUX_USB_ROLE_H */Overall Contributors
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