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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2
3#ifndef __UAPI_LINUX_USB_G_HID_H
4#define __UAPI_LINUX_USB_G_HID_H
5
6#include <linux/types.h>
7
8/* Maximum HID report length for High-Speed USB (i.e. USB 2.0) */
9#define MAX_REPORT_LENGTH 64
10
11/**
12 * struct usb_hidg_report - response to GET_REPORT
13 * @report_id: report ID that this is a response for
14 * @userspace_req:
15 * !0 this report is used for any pending GET_REPORT request
16 * but wait on userspace to issue a new report on future requests
17 * 0 this report is to be used for any future GET_REPORT requests
18 * @length: length of the report response
19 * @data: report response
20 * @padding: padding for 32/64 bit compatibility
21 *
22 * Structure used by GADGET_HID_WRITE_GET_REPORT ioctl on /dev/hidg*.
23 */
24struct usb_hidg_report {
25 __u8 report_id;
26 __u8 userspace_req;
27 __u16 length;
28 __u8 data[MAX_REPORT_LENGTH];
29 __u8 padding[4];
30};
31
32/* The 'g' code is used by gadgetfs and hid gadget ioctl requests.
33 * Don't add any colliding codes to either driver, and keep
34 * them in unique ranges.
35 */
36
37#define GADGET_HID_READ_GET_REPORT_ID _IOR('g', 0x41, __u8)
38#define GADGET_HID_WRITE_GET_REPORT _IOW('g', 0x42, struct usb_hidg_report)
39
40#endif /* __UAPI_LINUX_USB_G_HID_H */