drivers/usb/hid.h

   1 #ifndef __HID_H
   2 #define __HID_H
   3
   4 /*
   5  *  drivers/usb/hid.h  Version 0.8
   6  *
   7  *  Copyright (c) 1999 Andreas Gal
   8  *  Copyright (c) 2000 Vojtech Pavlik
   9  *
  10  *  Sponsored by SuSE
  11  */
  12
  13 /*
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  27  *
  28  * Should you need to contact me, the author, you can do so either by
  29  * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
  30  * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
  31  */
  32
  33 #include <linux/types.h>
  34 #include <linux/malloc.h>
  35 #include <linux/list.h>
  36
  37 /*
  38  * USB HID (Human Interface Device) interface class code
  39  */
  40
  41 #define USB_INTERFACE_CLASS_HID         3
  42
  43 /*
  44  * We parse each description item into this structure. Short items data
  45  * values are expanded to 32-bit signed int, long items contain a pointer
  46  * into the data area.
  47  */
  48
  49 struct hid_item {
  50         unsigned  format;
  51         __u8      size;
  52         __u8      type;
  53         __u8      tag;
  54         union {
  55             __u8   u8;
  56             __s8   s8;
  57             __u16  u16;
  58             __s16  s16;
  59             __u32  u32;
  60             __s32  s32;
  61             __u8  *longdata;
  62         } data;
  63 };
  64
  65 /*
  66  * HID report item format
  67  */
  68
  69 #define HID_ITEM_FORMAT_SHORT   0
  70 #define HID_ITEM_FORMAT_LONG    1
  71
  72 /*
  73  * Special tag indicating long items
  74  */
  75
  76 #define HID_ITEM_TAG_LONG       15
  77
  78 /*
  79  * HID report descriptor item type (prefix bit 2,3)
  80  */
  81
  82 #define HID_ITEM_TYPE_MAIN              0
  83 #define HID_ITEM_TYPE_GLOBAL            1
  84 #define HID_ITEM_TYPE_LOCAL             2
  85 #define HID_ITEM_TYPE_RESERVED          3
  86
  87 /*
  88  * HID report descriptor main item tags
  89  */
  90
  91 #define HID_MAIN_ITEM_TAG_INPUT                 8
  92 #define HID_MAIN_ITEM_TAG_OUTPUT                9
  93 #define HID_MAIN_ITEM_TAG_FEATURE               11
  94 #define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION      10
  95 #define HID_MAIN_ITEM_TAG_END_COLLECTION        12
  96
  97 /*
  98  * HID report descriptor main item contents
  99  */
 100
 101 #define HID_MAIN_ITEM_CONSTANT          0x001
 102 #define HID_MAIN_ITEM_VARIABLE          0x002
 103 #define HID_MAIN_ITEM_RELATIVE          0x004
 104 #define HID_MAIN_ITEM_WRAP              0x008
 105 #define HID_MAIN_ITEM_NONLINEAR         0x010
 106 #define HID_MAIN_ITEM_NO_PREFERRED      0x020
 107 #define HID_MAIN_ITEM_NULL_STATE        0x040
 108 #define HID_MAIN_ITEM_VOLATILE          0x080
 109 #define HID_MAIN_ITEM_BUFFERED_BYTE     0x100
 110
 111 /*
 112  * HID report descriptor collection item types
 113  */
 114
 115 #define HID_COLLECTION_PHYSICAL         0
 116 #define HID_COLLECTION_APPLICATION      1
 117 #define HID_COLLECTION_LOGICAL          2
 118
 119 /*
 120  * HID report descriptor global item tags
 121  */
 122
 123 #define HID_GLOBAL_ITEM_TAG_USAGE_PAGE          0
 124 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM     1
 125 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM     2
 126 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM    3
 127 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM    4
 128 #define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT       5
 129 #define HID_GLOBAL_ITEM_TAG_UNIT                6
 130 #define HID_GLOBAL_ITEM_TAG_REPORT_SIZE         7
 131 #define HID_GLOBAL_ITEM_TAG_REPORT_ID           8
 132 #define HID_GLOBAL_ITEM_TAG_REPORT_COUNT        9
 133 #define HID_GLOBAL_ITEM_TAG_PUSH                10
 134 #define HID_GLOBAL_ITEM_TAG_POP                 11
 135
 136 /*
 137  * HID report descriptor local item tags
 138  */
 139
 140 #define HID_LOCAL_ITEM_TAG_USAGE                0
 141 #define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM        1
 142 #define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM        2
 143 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX     3
 144 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM   4
 145 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM   5
 146 #define HID_LOCAL_ITEM_TAG_STRING_INDEX         7
 147 #define HID_LOCAL_ITEM_TAG_STRING_MINIMUM       8
 148 #define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM       9
 149 #define HID_LOCAL_ITEM_TAG_DELIMITER            10
 150
 151 /*
 152  * HID usage tables
 153  */
 154
 155 #define HID_USAGE_PAGE          0xffff0000
 156
 157 #define HID_UP_GENDESK          0x00010000
 158 #define HID_UP_KEYBOARD         0x00070000
 159 #define HID_UP_LED              0x00080000
 160 #define HID_UP_BUTTON           0x00090000
 161 #define HID_UP_CONSUMER         0x000c0000
 162 #define HID_UP_DIGITIZER        0x000d0000
 163 #define HID_UP_PID              0x000f0000
 164
 165 #define HID_USAGE               0x0000ffff
 166
 167 #define HID_GD_POINTER          0x00010001
 168 #define HID_GD_MOUSE            0x00010002
 169 #define HID_GD_JOYSTICK         0x00010004
 170 #define HID_GD_GAMEPAD          0x00010005
 171 #define HID_GD_HATSWITCH        0x00010039
 172
 173 /*
 174  * HID report types --- Ouch! HID spec says 1 2 3!
 175  */
 176
 177 #define HID_INPUT_REPORT        0
 178 #define HID_OUTPUT_REPORT       1
 179 #define HID_FEATURE_REPORT      2
 180
 181 /*
 182  * This is the global enviroment of the parser. This information is
 183  * persistent for main-items. The global enviroment can be saved and
 184  * restored with PUSH/POP statements.
 185  */
 186
 187 struct hid_global {
 188         unsigned usage_page;
 189         __s32    logical_minimum;
 190         __s32    logical_maximum;
 191         __s32    physical_minimum;
 192         __s32    physical_maximum;
 193         unsigned unit_exponent;
 194         unsigned unit;
 195         unsigned report_id;
 196         unsigned report_size;
 197         unsigned report_count;
 198 };
 199
 200 /*
 201  * This is the local enviroment. It is resistent up the the next main-item.
 202  */
 203
 204 #define MAX_USAGES 512
 205
 206 struct hid_local {
 207         unsigned usage[MAX_USAGES]; /* usage array */
 208         unsigned usage_index;
 209         unsigned usage_minimum;
 210         unsigned delimiter_depth;
 211         unsigned delimiter_branch;
 212 };
 213
 214 /*
 215  * This is the collection stack. We climb up the stack to determine
 216  * application and function of each field.
 217  */
 218
 219 struct hid_collection {
 220         unsigned type;
 221         unsigned usage;
 222 };
 223
 224 struct hid_usage {
 225         unsigned  hid;                  /* hid usage code */
 226         __u16     code;                 /* input driver code */
 227         __u8      type;                 /* input driver type */
 228         __u8      hat;                  /* hat switch fun */
 229 };
 230
 231 struct hid_field {
 232         unsigned  physical;             /* physical usage for this field */
 233         unsigned  logical;              /* logical usage for this field */
 234         struct hid_usage *usage;        /* usage table for this function */
 235         unsigned  maxusage;             /* maximum usage index */
 236         unsigned  flags;                /* main-item flags (i.e. volatile,array,constant) */
 237         unsigned  report_offset;        /* bit offset in the report */
 238         unsigned  report_size;          /* size of this field in the report */
 239         unsigned  report_count;         /* number of this field in the report */
 240         unsigned  report_type;          /* (input,output,feature) */
 241         __s32    *value;                /* last known value(s) */
 242         __s32     logical_minimum;
 243         __s32     logical_maximum;
 244         __s32     physical_minimum;
 245         __s32     physical_maximum;
 246         unsigned  unit_exponent;
 247         unsigned  unit;
 248         struct hid_report *report;      /* associated report */
 249 };
 250
 251 #define HID_MAX_FIELDS 64
 252
 253 struct hid_report {
 254         struct list_head list;
 255         unsigned id;                                    /* id of this report */
 256         unsigned type;                                  /* report type */
 257         struct hid_field *field[HID_MAX_FIELDS];        /* fields of the report */
 258         unsigned maxfield;                              /* maximum valid field index */
 259         unsigned size;                                  /* size of the report (bits) */
 260         struct hid_device *device;                      /* associated device */
 261 };
 262
 263 struct hid_report_enum {
 264         unsigned numbered;
 265         struct list_head report_list;
 266         struct hid_report *report_id_hash[256];
 267 };
 268
 269 #define HID_REPORT_TYPES 3
 270
 271 struct hid_device {                                                     /* device report descriptor */
 272          __u8 *rdesc;
 273         unsigned rsize;
 274         unsigned application;                                           /* HID application, i.e. Digitizer */
 275         unsigned version;                                               /* HID version */
 276         unsigned country;                                               /* HID country */
 277         struct hid_report_enum report_enum[HID_REPORT_TYPES];
 278
 279         struct usb_device *dev;                                         /* USB device */
 280         int ifnum;                                                      /* USB interface number */
 281
 282         char buffer[32];                                                /* Receive buffer */
 283         char bufout[32];                                                /* Transmit buffer */
 284         devrequest dr;                                                  /* Startup packet */
 285         struct urb urb;                                                 /* USB URB structure */
 286         struct urb urbout;                                              /* Output URB */
 287         struct input_dev input;                                         /* input device structure */
 288 };
 289
 290 #define HID_GLOBAL_STACK_SIZE 4
 291 #define HID_COLLECTION_STACK_SIZE 4
 292
 293 struct hid_parser {
 294         struct hid_global     global;
 295         struct hid_global     global_stack[HID_GLOBAL_STACK_SIZE];
 296         unsigned              global_stack_ptr;
 297         struct hid_local      local;
 298         struct hid_collection collection_stack[HID_COLLECTION_STACK_SIZE];
 299         unsigned              collection_stack_ptr;
 300         struct hid_device    *device;
 301 };
 302
 303 struct hid_class_descriptor {
 304         __u8  bDescriptorType;
 305         __u16 wDescriptorLength;
 306 } __attribute__ ((packed));
 307
 308 struct hid_descriptor {
 309         __u8  bLength;
 310         __u8  bDescriptorType;
 311         __u16 bcdHID;
 312         __u8  bCountryCode;
 313         __u8  bNumDescriptors;
 314
 315         struct hid_class_descriptor desc[1];
 316 } __attribute__ ((packed));
 317
 318
 319 #endif
 320