1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef __LINUX_USB_ROLE_H 4 #define __LINUX_USB_ROLE_H 5 6 #include <linux/device.h> 7 8 struct usb_role_switch; 9 10 enum usb_role { 11 USB_ROLE_NONE, 12 USB_ROLE_HOST, 13 USB_ROLE_DEVICE, 14 }; 15 16 typedef int (*usb_role_switch_set_t)(struct device *dev, enum usb_role role); 17 typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev); 18 19 /** 20 * struct usb_role_switch_desc - USB Role Switch Descriptor 21 * @usb2_port: Optional reference to the host controller port device (USB2) 22 * @usb3_port: Optional reference to the host controller port device (USB3) 23 * @udc: Optional reference to the peripheral controller device 24 * @set: Callback for setting the role 25 * @get: Callback for getting the role (optional) 26 * @allow_userspace_control: If true userspace may change the role through sysfs 27 * 28 * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB 29 * device controller behind the USB connector with the role switch. If 30 * @usb2_port, @usb3_port and @udc are included in the description, the 31 * reference count for them should be incremented by the caller of 32 * usb_role_switch_register() before registering the switch. 33 */ 34 struct usb_role_switch_desc { 35 struct device *usb2_port; 36 struct device *usb3_port; 37 struct device *udc; 38 usb_role_switch_set_t set; 39 usb_role_switch_get_t get; 40 bool allow_userspace_control; 41 }; 42 43 int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role); 44 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw); 45 struct usb_role_switch *usb_role_switch_get(struct device *dev); 46 void usb_role_switch_put(struct usb_role_switch *sw); 47 48 struct usb_role_switch * 49 usb_role_switch_register(struct device *parent, 50 const struct usb_role_switch_desc *desc); 51 void usb_role_switch_unregister(struct usb_role_switch *sw); 52 53 #endif /* __LINUX_USB_ROLE_H */ 54