e5256194cb
The switch devices have been named by using the name of the parent device as base for now, but if for example the parent device controls multiple muxes, that will not work. Adding an optional member "name" to the switch descriptor that can be used for naming the switch during registration. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20200302135353.56659-7-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
115 lines
3.3 KiB
C
115 lines
3.3 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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#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_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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#endif
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#endif /* __LINUX_USB_ROLE_H */
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