cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/hiddev.h

 *  Copyright (c) 1999-2000 Vojtech Pavlik
 *  Sponsored by SuSE
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or 
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <>, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
#ifndef _UAPI_HIDDEV_H

#define _UAPI_HIDDEV_H

#include <linux/types.h>

 * The event structure itself

struct hiddev_event {
unsigned hid;
signed int value;

struct hiddev_devinfo {
__u32 bustype;
__u32 busnum;
__u32 devnum;
__u32 ifnum;
__s16 vendor;
__s16 product;
__s16 version;
__u32 num_applications;

struct hiddev_collection_info {
__u32 index;
__u32 type;
__u32 usage;
__u32 level;

#define HID_STRING_SIZE 256

struct hiddev_string_descriptor {
__s32 index;
char value[HID_STRING_SIZE];

struct hiddev_report_info {
__u32 report_type;
__u32 report_id;
__u32 num_fields;

/* To do a GUSAGE/SUSAGE, fill in at least usage_code,  report_type and 
 * report_id.  Set report_id to REPORT_ID_UNKNOWN if the rest of the fields 
 * are unknown.  Otherwise use a usage_ref struct filled in from a previous 
 * successful GUSAGE call to save time.  To actually send a value to the
 * device, perform a SUSAGE first, followed by a SREPORT.  An INITREPORT or a
 * GREPORT isn't necessary for a GUSAGE to return valid data.

#define HID_REPORT_ID_UNKNOWN 0xffffffff

#define HID_REPORT_ID_FIRST   0x00000100

#define HID_REPORT_ID_NEXT    0x00000200

#define HID_REPORT_ID_MASK    0x000000ff

#define HID_REPORT_ID_MAX     0x000000ff




#define HID_REPORT_TYPE_MIN     1

#define HID_REPORT_TYPE_MAX     3

struct hiddev_field_info {
__u32 report_type;
__u32 report_id;
__u32 field_index;
__u32 maxusage;
__u32 flags;
__u32 physical;		/* physical usage for this field */
__u32 logical;		/* logical usage for this field */
__u32 application;		/* application usage for this field */
__s32 logical_minimum;
__s32 logical_maximum;
__s32 physical_minimum;
__s32 physical_maximum;
__u32 unit_exponent;
__u32 unit;

/* Fill in report_type, report_id and field_index to get the information on a
 * field.

#define HID_FIELD_CONSTANT		0x001

#define HID_FIELD_VARIABLE		0x002

#define HID_FIELD_RELATIVE		0x004

#define HID_FIELD_WRAP			0x008	

#define HID_FIELD_NONLINEAR		0x010


#define HID_FIELD_NULL_STATE		0x040

#define HID_FIELD_VOLATILE		0x080


struct hiddev_usage_ref {
__u32 report_type;
__u32 report_id;
__u32 field_index;
__u32 usage_index;
__u32 usage_code;
__s32 value;

/* hiddev_usage_ref_multi is used for sending multiple bytes to a control.
 * It really manifests itself as setting the value of consecutive usages */


struct hiddev_usage_ref_multi {
struct hiddev_usage_ref uref;
__u32 num_values;
__s32 values[HID_MAX_MULTI_USAGES];

/* FIELD_INDEX_NONE is returned in read() data from the kernel when flags
 * is set to (HIDDEV_FLAG_UREF | HIDDEV_FLAG_REPORT) and a new report has
 * been sent by the device 

#define HID_FIELD_INDEX_NONE 0xffffffff

 * Protocol version.

#define HID_VERSION		0x010004

 * IOCTLs (0x00 - 0x7f)

#define HIDIOCGVERSION		_IOR('H', 0x01, int)

#define HIDIOCAPPLICATION	_IO('H', 0x02)

#define HIDIOCGDEVINFO		_IOR('H', 0x03, struct hiddev_devinfo)

#define HIDIOCGSTRING		_IOR('H', 0x04, struct hiddev_string_descriptor)

#define HIDIOCINITREPORT	_IO('H', 0x05)

#define HIDIOCGNAME(len)	_IOC(_IOC_READ, 'H', 0x06, len)

#define HIDIOCGREPORT		_IOW('H', 0x07, struct hiddev_report_info)

#define HIDIOCSREPORT		_IOW('H', 0x08, struct hiddev_report_info)

#define HIDIOCGREPORTINFO	_IOWR('H', 0x09, struct hiddev_report_info)

#define HIDIOCGFIELDINFO	_IOWR('H', 0x0A, struct hiddev_field_info)

#define HIDIOCGUSAGE		_IOWR('H', 0x0B, struct hiddev_usage_ref)

#define HIDIOCSUSAGE		_IOW('H', 0x0C, struct hiddev_usage_ref)

#define HIDIOCGUCODE		_IOWR('H', 0x0D, struct hiddev_usage_ref)

#define HIDIOCGFLAG		_IOR('H', 0x0E, int)

#define HIDIOCSFLAG		_IOW('H', 0x0F, int)

#define HIDIOCGCOLLECTIONINDEX	_IOW('H', 0x10, struct hiddev_usage_ref)

#define HIDIOCGCOLLECTIONINFO	_IOWR('H', 0x11, struct hiddev_collection_info)

#define HIDIOCGPHYS(len)	_IOC(_IOC_READ, 'H', 0x12, len)

/* For writing/reading to multiple/consecutive usages */

#define HIDIOCGUSAGES		_IOWR('H', 0x13, struct hiddev_usage_ref_multi)

#define HIDIOCSUSAGES		_IOW('H', 0x14, struct hiddev_usage_ref_multi)

 * Flags to be used in HIDIOCSFLAG

#define HIDDEV_FLAG_UREF	0x1


#define HIDDEV_FLAGS		0x3

/* To traverse the input report descriptor info for a HID device, perform the 
 * following:
 * rinfo.report_type = HID_REPORT_TYPE_INPUT;
 * rinfo.report_id = HID_REPORT_ID_FIRST;
 * ret = ioctl(fd, HIDIOCGREPORTINFO, &rinfo);
 * while (ret >= 0) {
 *      for (i = 0; i < rinfo.num_fields; i++) {
 *              finfo.report_type = rinfo.report_type;
 *              finfo.report_id = rinfo.report_id;
 *              finfo.field_index = i;
 *              ioctl(fd, HIDIOCGFIELDINFO, &finfo);
 *              for (j = 0; j < finfo.maxusage; j++) {
 *                      uref.report_type = rinfo.report_type;
 *                      uref.report_id = rinfo.report_id;
 *                      uref.field_index = i;
 *                      uref.usage_index = j;
 *                      ioctl(fd, HIDIOCGUCODE, &uref);
 *                      ioctl(fd, HIDIOCGUSAGE, &uref);
 *              }
 *      }
 *      rinfo.report_id |= HID_REPORT_ID_NEXT;
 *      ret = ioctl(fd, HIDIOCGREPORTINFO, &rinfo);
 * }

#endif /* _UAPI_HIDDEV_H */

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