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f43d3870ca
Currently the hidraw module can only read and write feature HID reports on demand, via dedicated ioctls. Input reports are read from the device through the read() interface, while output reports are written through the write interface(). This is insufficient; it is desirable in many situations to be able to read and write input and output reports through the control interface to cover additional scenarios: - Reading an input report by its report ID, to get initial state - Writing an input report, to set initial input state in the device - Reading an output report by its report ID, to obtain current state - Writing an output report by its report ID, out of band This patch adds these missing ioctl requests to read and write the remaining HID report types. Note that not all HID backends will neccesarily support this (e.g. while the USB link layer supports setting Input reports, others may not). Also included are documentation and example updates. The current hidraw documentation states that feature reports read from the device does *not* include the report ID, however this is not the case and the returned report will have its report ID prepended by conforming HID devices, as the report data sent from the device over the control endpoint must be indentical in format to those sent over the regular transport. Signed-off-by: Dean Camera <dean@fourwalledcubicle.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
58 lines
2 KiB
C
58 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Copyright (c) 2007 Jiri Kosina
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _UAPI_HIDRAW_H
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#define _UAPI_HIDRAW_H
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#include <linux/hid.h>
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#include <linux/types.h>
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struct hidraw_report_descriptor {
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__u32 size;
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__u8 value[HID_MAX_DESCRIPTOR_SIZE];
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};
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struct hidraw_devinfo {
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__u32 bustype;
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__s16 vendor;
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__s16 product;
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};
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/* ioctl interface */
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#define HIDIOCGRDESCSIZE _IOR('H', 0x01, int)
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#define HIDIOCGRDESC _IOR('H', 0x02, struct hidraw_report_descriptor)
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#define HIDIOCGRAWINFO _IOR('H', 0x03, struct hidraw_devinfo)
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#define HIDIOCGRAWNAME(len) _IOC(_IOC_READ, 'H', 0x04, len)
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#define HIDIOCGRAWPHYS(len) _IOC(_IOC_READ, 'H', 0x05, len)
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/* The first byte of SFEATURE and GFEATURE is the report number */
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#define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)
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#define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)
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#define HIDIOCGRAWUNIQ(len) _IOC(_IOC_READ, 'H', 0x08, len)
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/* The first byte of SINPUT and GINPUT is the report number */
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#define HIDIOCSINPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x09, len)
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#define HIDIOCGINPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0A, len)
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/* The first byte of SOUTPUT and GOUTPUT is the report number */
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#define HIDIOCSOUTPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0B, len)
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#define HIDIOCGOUTPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0C, len)
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#define HIDRAW_FIRST_MINOR 0
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#define HIDRAW_MAX_DEVICES 64
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/* number of reports to buffer */
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#define HIDRAW_BUFFER_SIZE 64
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/* kernel-only API declarations */
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#endif /* _UAPI_HIDRAW_H */
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