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hiddev.h

#ifndef _HIDDEV_H
#define _HIDDEV_H

/*
 * $Id: hiddev.h,v 1.4 2001/06/06 14:27:44 vojtech Exp $
 *
 *  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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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 <vojtech@suse.cz>, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
 */

/*
 * The event structure itself
 */

struct hiddev_event {
      unsigned hid;
      signed int value;
};

struct hiddev_devinfo {
      unsigned int bustype;
      unsigned int busnum;
      unsigned int devnum;
      unsigned int ifnum;
      short vendor;
      short product;
      short version;
      unsigned num_applications;
};

#define HID_STRING_SIZE 256
struct hiddev_string_descriptor {
      int index;
      char value[HID_STRING_SIZE];
};

struct hiddev_report_info {
      unsigned report_type;
      unsigned report_id;
      unsigned 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/SUSAGE call to save time.  To actually send a value
 * to the device, perform a SUSAGE first, followed by a SREPORT.  If an
 * INITREPORT is done, a GREPORT isn't necessary before a GUSAGE.
 */
#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_INPUT 1
#define HID_REPORT_TYPE_OUTPUT      2
#define HID_REPORT_TYPE_FEATURE     3
#define HID_REPORT_TYPE_MIN     1
#define HID_REPORT_TYPE_MAX     3

struct hiddev_field_info {
      unsigned report_type;
      unsigned report_id;
      unsigned field_index;
      unsigned maxusage;
      unsigned flags;
      unsigned physical;            /* physical usage for this field */
      unsigned logical;       /* logical usage for this field */
      unsigned application;         /* application usage for this field */
      __s32 logical_minimum;
      __s32 logical_maximum;
      __s32 physical_minimum;
      __s32 physical_maximum;
      unsigned unit_exponent;
      unsigned 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_NO_PREFERRED            0x020
#define HID_FIELD_NULL_STATE        0x040
#define HID_FIELD_VOLATILE          0x080
#define HID_FIELD_BUFFERED_BYTE           0x100

struct hiddev_usage_ref {
      unsigned report_type;
      unsigned report_id;
      unsigned field_index;
      unsigned usage_index;
      unsigned usage_code;
      __s32 value;
};


/*
 * Protocol version.
 */

#define HID_VERSION           0x010002

/*
 * 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)

/* 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.field_index = i;
 *          uref.usage_index = j;
 *          ioctl(fd, HIDIOCGUCODE, &uref);
 *          ioctl(fd, HIDIOCGUSAGE, &uref);
 *          }
 *    }
 *    uref.report_id |= HID_REPORT_ID_NEXT;
 *    ret = ioctl(fd, HIDIOCGREPORTINFO, &uref);
 *  }
 */


#ifdef __KERNEL__

/*
 * In-kernel definitions.
 */

#ifdef CONFIG_USB_HIDDEV
int hiddev_connect(struct hid_device *);
void hiddev_disconnect(struct hid_device *);
void hiddev_hid_event(struct hid_device *, unsigned int usage, int value);
int __init hiddev_init(void);
void __exit hiddev_exit(void);
#else
static inline void *hiddev_connect(struct hid_device *hid) { return NULL; }
static inline void hiddev_disconnect(struct hid_device *hid) { }
static inline void hiddev_event(struct hid_device *hid, unsigned int usage, int value) { }
static inline int hiddev_init(void) { return 0; }
static inline void hiddev_exit(void) { }
#endif

#endif
#endif

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