common/usb_kbd.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland
   4  *
   5  * Part of this source has been derived from the Linux USB
   6  * project.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  *
  26  */
  27 #include <common.h>
  28 #include <devices.h>
  29 #include <asm/byteorder.h>
  30
  31 #include <usb.h>
  32
  33 #undef USB_KBD_DEBUG
  34 /*
  35  * if overwrite_console returns 1, the stdin, stderr and stdout
  36  * are switched to the serial port, else the settings in the
  37  * environment are used
  38  */
  39 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  40 extern int overwrite_console (void);
  41 #else
  42 int overwrite_console (void)
  43 {
  44         return (0);
  45 }
  46 #endif
  47
  48 #ifdef  USB_KBD_DEBUG
  49 #define USB_KBD_PRINTF(fmt,args...)     printf (fmt ,##args)
  50 #else
  51 #define USB_KBD_PRINTF(fmt,args...)
  52 #endif
  53
  54
  55 #define REPEAT_RATE  40/4 /* 40msec -> 25cps */
  56 #define REPEAT_DELAY 10 /* 10 x REAPEAT_RATE = 400msec */
  57
  58 #define NUM_LOCK        0x53
  59 #define CAPS_LOCK 0x39
  60 #define SCROLL_LOCK 0x47
  61
  62
  63 /* Modifier bits */
  64 #define LEFT_CNTR               0
  65 #define LEFT_SHIFT      1
  66 #define LEFT_ALT                2
  67 #define LEFT_GUI                3
  68 #define RIGHT_CNTR      4
  69 #define RIGHT_SHIFT     5
  70 #define RIGHT_ALT               6
  71 #define RIGHT_GUI               7
  72
  73 #define USB_KBD_BUFFER_LEN 0x20  /* size of the keyboardbuffer */
  74
  75 static volatile char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
  76 static volatile int usb_in_pointer = 0;
  77 static volatile int usb_out_pointer = 0;
  78
  79 unsigned char new[8];
  80 unsigned char old[8];
  81 int repeat_delay;
  82 #define DEVNAME "usbkbd"
  83 static unsigned char num_lock = 0;
  84 static unsigned char caps_lock = 0;
  85 static unsigned char scroll_lock = 0;
  86 static unsigned char ctrl = 0;
  87
  88 static unsigned char leds __attribute__ ((aligned (0x4)));
  89
  90 static unsigned char usb_kbd_numkey[] = {
  91          '1', '2', '3', '4', '5', '6', '7', '8', '9', '0','\r',0x1b,'\b','\t',' ', '-',
  92          '=', '[', ']','\\', '#', ';', '\'', '`', ',', '.', '/'
  93 };
  94 static unsigned char usb_kbd_numkey_shifted[] = {
  95          '!', '@', '#', '$', '%', '^', '&', '*', '(', ')','\r',0x1b,'\b','\t',' ', '_',
  96          '+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?'
  97 };
  98
  99 /******************************************************************
 100  * Queue handling
 101  ******************************************************************/
 102 /* puts character in the queue and sets up the in and out pointer */
 103 static void usb_kbd_put_queue(char data)
 104 {
 105         if((usb_in_pointer+1)==USB_KBD_BUFFER_LEN) {
 106                 if(usb_out_pointer==0) {
 107                         return; /* buffer full */
 108                 } else{
 109                         usb_in_pointer=0;
 110                 }
 111         } else {
 112                 if((usb_in_pointer+1)==usb_out_pointer)
 113                         return; /* buffer full */
 114                 usb_in_pointer++;
 115         }
 116         usb_kbd_buffer[usb_in_pointer]=data;
 117         return;
 118 }
 119
 120 /* test if a character is in the queue */
 121 static int usb_kbd_testc(void)
 122 {
 123 #ifdef CONFIG_SYS_USB_EVENT_POLL
 124         usb_event_poll();
 125 #endif
 126         if(usb_in_pointer==usb_out_pointer)
 127                 return(0); /* no data */
 128         else
 129                 return(1);
 130 }
 131 /* gets the character from the queue */
 132 static int usb_kbd_getc(void)
 133 {
 134         char c;
 135         while(usb_in_pointer==usb_out_pointer) {
 136 #ifdef CONFIG_SYS_USB_EVENT_POLL
 137                 usb_event_poll();
 138 #endif
 139         }
 140         if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
 141                 usb_out_pointer=0;
 142         else
 143                 usb_out_pointer++;
 144         c=usb_kbd_buffer[usb_out_pointer];
 145         return (int)c;
 146
 147 }
 148
 149 /* forward decleration */
 150 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
 151
 152 /* search for keyboard and register it if found */
 153 int drv_usb_kbd_init(void)
 154 {
 155         int error,i;
 156         device_t usb_kbd_dev,*old_dev;
 157         struct usb_device *dev;
 158         char *stdinname  = getenv ("stdin");
 159
 160         usb_in_pointer=0;
 161         usb_out_pointer=0;
 162         /* scan all USB Devices */
 163         for(i=0;i<USB_MAX_DEVICE;i++) {
 164                 dev=usb_get_dev_index(i); /* get device */
 165                 if(dev == NULL)
 166                         return -1;
 167                 if(dev->devnum!=-1) {
 168                         if(usb_kbd_probe(dev,0)==1) { /* Ok, we found a keyboard */
 169                                 /* check, if it is already registered */
 170                                 USB_KBD_PRINTF("USB KBD found set up device.\n");
 171                                 old_dev = device_get_by_name(DEVNAME);
 172                                 if(old_dev) {
 173                                         /* ok, already registered, just return ok */
 174                                         USB_KBD_PRINTF("USB KBD is already registered.\n");
 175                                         return 1;
 176                                 }
 177                                 /* register the keyboard */
 178                                 USB_KBD_PRINTF("USB KBD register.\n");
 179                                 memset (&usb_kbd_dev, 0, sizeof(device_t));
 180                                 strcpy(usb_kbd_dev.name, DEVNAME);
 181                                 usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 182                                 usb_kbd_dev.putc = NULL;
 183                                 usb_kbd_dev.puts = NULL;
 184                                 usb_kbd_dev.getc = usb_kbd_getc;
 185                                 usb_kbd_dev.tstc = usb_kbd_testc;
 186                                 error = device_register (&usb_kbd_dev);
 187                                 if(error==0) {
 188                                         /* check if this is the standard input device */
 189                                         if(strcmp(stdinname,DEVNAME)==0) {
 190                                                 /* reassign the console */
 191                                                 if(overwrite_console()) {
 192                                                         return 1;
 193                                                 }
 194                                                 error=console_assign(stdin,DEVNAME);
 195                                                 if(error==0)
 196                                                         return 1;
 197                                                 else
 198                                                         return error;
 199                                         }
 200                                         return 1;
 201                                 }
 202                                 return error;
 203                         }
 204                 }
 205         }
 206         /* no USB Keyboard found */
 207         return -1;
 208 }
 209
 210
 211 /* deregistering the keyboard */
 212 int usb_kbd_deregister(void)
 213 {
 214         return device_deregister(DEVNAME);
 215 }
 216
 217 /**************************************************************************
 218  * Low Level drivers
 219  */
 220
 221 /* set the LEDs. Since this is used in the irq routine, the control job
 222    is issued with a timeout of 0. This means, that the job is queued without
 223    waiting for job completion */
 224
 225 static void usb_kbd_setled(struct usb_device *dev)
 226 {
 227         struct usb_interface_descriptor *iface;
 228         iface = &dev->config.if_desc[0];
 229         leds=0;
 230         if(scroll_lock!=0)
 231                 leds|=1;
 232         leds<<=1;
 233         if(caps_lock!=0)
 234                 leds|=1;
 235         leds<<=1;
 236         if(num_lock!=0)
 237                 leds|=1;
 238         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 239                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 240                 0x200, iface->bInterfaceNumber,(void *)&leds, 1, 0);
 241
 242 }
 243
 244
 245 #define CAPITAL_MASK 0x20
 246 /* Translate the scancode in ASCII */
 247 static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int pressed)
 248 {
 249         unsigned char keycode;
 250
 251         if(pressed==0) {
 252                 /* key released */
 253                 repeat_delay=0;
 254                 return 0;
 255         }
 256         if(pressed==2) {
 257                 repeat_delay++;
 258                 if(repeat_delay<REPEAT_DELAY)
 259                         return 0;
 260                 repeat_delay=REPEAT_DELAY;
 261         }
 262         keycode=0;
 263         if((scancode>3) && (scancode<=0x1d)) { /* alpha numeric values */
 264                 keycode=scancode-4 + 0x61;
 265                 if(caps_lock)
 266                         keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 267                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) {
 268                         if(keycode & CAPITAL_MASK)
 269                                 keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 270                         else
 271                                 keycode|=CAPITAL_MASK; /* switch to non capital Letters */
 272                 }
 273         }
 274         if((scancode>0x1d) && (scancode<0x3A)) {
 275                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0))  /* shifted */
 276                         keycode=usb_kbd_numkey_shifted[scancode-0x1e];
 277                 else /* non shifted */
 278                         keycode=usb_kbd_numkey[scancode-0x1e];
 279         }
 280
 281         if (ctrl)
 282                 keycode = scancode - 0x3;
 283
 284         if(pressed==1) {
 285                 if(scancode==NUM_LOCK) {
 286                         num_lock=~num_lock;
 287                         return 1;
 288                 }
 289                 if(scancode==CAPS_LOCK) {
 290                         caps_lock=~caps_lock;
 291                         return 1;
 292                 }
 293                 if(scancode==SCROLL_LOCK) {
 294                         scroll_lock=~scroll_lock;
 295                         return 1;
 296                 }
 297         }
 298         if(keycode!=0) {
 299                 USB_KBD_PRINTF("%c",keycode);
 300                 usb_kbd_put_queue(keycode);
 301         }
 302         return 0;
 303 }
 304
 305 /* Interrupt service routine */
 306 static int usb_kbd_irq(struct usb_device *dev)
 307 {
 308         int i,res;
 309
 310         if((dev->irq_status!=0)||(dev->irq_act_len!=8))
 311         {
 312                 USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
 313                 return 1;
 314         }
 315         res=0;
 316
 317         switch (new[0]) {
 318         case 0x0:       /* No combo key pressed */
 319                 ctrl = 0;
 320                 break;
 321         case 0x01:      /* Left Ctrl pressed */
 322         case 0x10:      /* Right Ctrl pressed */
 323                 ctrl = 1;
 324                 break;
 325         }
 326
 327         for (i = 2; i < 8; i++) {
 328                 if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8]) {
 329                         res|=usb_kbd_translate(old[i],new[0],0);
 330                 }
 331                 if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8]) {
 332                         res|=usb_kbd_translate(new[i],new[0],1);
 333                 }
 334         }
 335         if((new[2]>3) && (old[2]==new[2])) /* still pressed */
 336                 res|=usb_kbd_translate(new[2],new[0],2);
 337         if(res==1)
 338                 usb_kbd_setled(dev);
 339         memcpy(&old[0],&new[0], 8);
 340         return 1; /* install IRQ Handler again */
 341 }
 342
 343 /* probes the USB device dev for keyboard type */
 344 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 345 {
 346         struct usb_interface_descriptor *iface;
 347         struct usb_endpoint_descriptor *ep;
 348         int pipe,maxp;
 349
 350         if (dev->descriptor.bNumConfigurations != 1) return 0;
 351         iface = &dev->config.if_desc[ifnum];
 352
 353         if (iface->bInterfaceClass != 3) return 0;
 354         if (iface->bInterfaceSubClass != 1) return 0;
 355         if (iface->bInterfaceProtocol != 1) return 0;
 356         if (iface->bNumEndpoints != 1) return 0;
 357
 358         ep = &iface->ep_desc[0];
 359
 360         if (!(ep->bEndpointAddress & 0x80)) return 0;
 361         if ((ep->bmAttributes & 3) != 3) return 0;
 362         USB_KBD_PRINTF("USB KBD found set protocol...\n");
 363         /* ok, we found a USB Keyboard, install it */
 364         /* usb_kbd_get_hid_desc(dev); */
 365         usb_set_protocol(dev, iface->bInterfaceNumber, 0);
 366         USB_KBD_PRINTF("USB KBD found set idle...\n");
 367         usb_set_idle(dev, iface->bInterfaceNumber, REPEAT_RATE, 0);
 368         memset(&new[0], 0, 8);
 369         memset(&old[0], 0, 8);
 370         repeat_delay=0;
 371         pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 372         maxp = usb_maxpacket(dev, pipe);
 373         dev->irq_handle=usb_kbd_irq;
 374         USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
 375         usb_submit_int_msg(dev,pipe,&new[0], maxp > 8 ? 8 : maxp,ep->bInterval);
 376         return 1;
 377 }
 378
 379
 380 #if 0
 381 struct usb_hid_descriptor {
 382         unsigned char  bLength;
 383         unsigned char  bDescriptorType; /* 0x21 for HID */
 384         unsigned short bcdHID; /* release number */
 385         unsigned char  bCountryCode;
 386         unsigned char  bNumDescriptors;
 387         unsigned char  bReportDescriptorType;
 388         unsigned short wDescriptorLength;
 389 } __attribute__ ((packed));
 390
 391 /*
 392  * We parse each description item into this structure. Short items data
 393  * values are expanded to 32-bit signed int, long items contain a pointer
 394  * into the data area.
 395  */
 396
 397 struct hid_item {
 398         unsigned char format;
 399         unsigned char size;
 400         unsigned char type;
 401         unsigned char tag;
 402         union {
 403             unsigned char   u8;
 404             char            s8;
 405             unsigned short  u16;
 406             short           s16;
 407             unsigned long   u32;
 408             long            s32;
 409             unsigned char  *longdata;
 410         } data;
 411 };
 412
 413 /*
 414  * HID report item format
 415  */
 416
 417 #define HID_ITEM_FORMAT_SHORT   0
 418 #define HID_ITEM_FORMAT_LONG    1
 419
 420 /*
 421  * Special tag indicating long items
 422  */
 423
 424 #define HID_ITEM_TAG_LONG       15
 425
 426
 427 static struct usb_hid_descriptor usb_kbd_hid_desc;
 428
 429 void usb_kbd_display_hid(struct usb_hid_descriptor *hid)
 430 {
 431         printf("USB_HID_DESC:\n");
 432         printf("  bLenght               0x%x\n",hid->bLength);
 433         printf("  bcdHID                0x%x\n",hid->bcdHID);
 434         printf("  bCountryCode          %d\n",hid->bCountryCode);
 435         printf("  bNumDescriptors       0x%x\n",hid->bNumDescriptors);
 436         printf("  bReportDescriptorType 0x%x\n",hid->bReportDescriptorType);
 437         printf("  wDescriptorLength     0x%x\n",hid->wDescriptorLength);
 438 }
 439
 440
 441 /*
 442  * Fetch a report description item from the data stream. We support long
 443  * items, though they are not used yet.
 444  */
 445
 446 static int fetch_item(unsigned char *start,unsigned char *end, struct hid_item *item)
 447 {
 448         if((end - start) > 0) {
 449                 unsigned char b = *start++;
 450                 item->type = (b >> 2) & 3;
 451                 item->tag  = (b >> 4) & 15;
 452                 if (item->tag == HID_ITEM_TAG_LONG) {
 453                         item->format = HID_ITEM_FORMAT_LONG;
 454                         if ((end - start) >= 2) {
 455                                 item->size = *start++;
 456                                 item->tag  = *start++;
 457                                 if ((end - start) >= item->size) {
 458                                         item->data.longdata = start;
 459                                         start += item->size;
 460                                         return item->size;
 461                                 }
 462                         }
 463                 } else {
 464                         item->format = HID_ITEM_FORMAT_SHORT;
 465                         item->size = b & 3;
 466                         switch (item->size) {
 467                                 case 0:
 468                                         return item->size;
 469                                 case 1:
 470                                         if ((end - start) >= 1) {
 471                                                 item->data.u8 = *start++;
 472                                                 return item->size;
 473                                         }
 474                                         break;
 475                                 case 2:
 476                                         if ((end - start) >= 2) {
 477                                                 item->data.u16 = le16_to_cpu((unsigned short *)start);
 478                                                 start+=2;
 479                                                 return item->size;
 480                                         }
 481                                 case 3:
 482                                         item->size++;
 483                                         if ((end - start) >= 4) {
 484                                                 item->data.u32 = le32_to_cpu((unsigned long *)start);
 485                                                 start+=4;
 486                                                 return item->size;
 487                                         }
 488                         }
 489                 }
 490         }
 491         return -1;
 492 }
 493
 494 /*
 495  * HID report descriptor item type (prefix bit 2,3)
 496  */
 497
 498 #define HID_ITEM_TYPE_MAIN              0
 499 #define HID_ITEM_TYPE_GLOBAL            1
 500 #define HID_ITEM_TYPE_LOCAL             2
 501 #define HID_ITEM_TYPE_RESERVED          3
 502 /*
 503  * HID report descriptor main item tags
 504  */
 505
 506 #define HID_MAIN_ITEM_TAG_INPUT                 8
 507 #define HID_MAIN_ITEM_TAG_OUTPUT                9
 508 #define HID_MAIN_ITEM_TAG_FEATURE               11
 509 #define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION      10
 510 #define HID_MAIN_ITEM_TAG_END_COLLECTION        12
 511 /*
 512  * HID report descriptor main item contents
 513  */
 514
 515 #define HID_MAIN_ITEM_CONSTANT          0x001
 516 #define HID_MAIN_ITEM_VARIABLE          0x002
 517 #define HID_MAIN_ITEM_RELATIVE          0x004
 518 #define HID_MAIN_ITEM_WRAP              0x008
 519 #define HID_MAIN_ITEM_NONLINEAR         0x010
 520 #define HID_MAIN_ITEM_NO_PREFERRED      0x020
 521 #define HID_MAIN_ITEM_NULL_STATE        0x040
 522 #define HID_MAIN_ITEM_VOLATILE          0x080
 523 #define HID_MAIN_ITEM_BUFFERED_BYTE     0x100
 524
 525 /*
 526  * HID report descriptor collection item types
 527  */
 528
 529 #define HID_COLLECTION_PHYSICAL         0
 530 #define HID_COLLECTION_APPLICATION      1
 531 #define HID_COLLECTION_LOGICAL          2
 532 /*
 533  * HID report descriptor global item tags
 534  */
 535
 536 #define HID_GLOBAL_ITEM_TAG_USAGE_PAGE          0
 537 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM     1
 538 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM     2
 539 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM    3
 540 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM    4
 541 #define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT       5
 542 #define HID_GLOBAL_ITEM_TAG_UNIT                6
 543 #define HID_GLOBAL_ITEM_TAG_REPORT_SIZE         7
 544 #define HID_GLOBAL_ITEM_TAG_REPORT_ID           8
 545 #define HID_GLOBAL_ITEM_TAG_REPORT_COUNT        9
 546 #define HID_GLOBAL_ITEM_TAG_PUSH                10
 547 #define HID_GLOBAL_ITEM_TAG_POP                 11
 548
 549 /*
 550  * HID report descriptor local item tags
 551  */
 552
 553 #define HID_LOCAL_ITEM_TAG_USAGE                0
 554 #define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM        1
 555 #define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM        2
 556 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX     3
 557 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM   4
 558 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM   5
 559 #define HID_LOCAL_ITEM_TAG_STRING_INDEX         7
 560 #define HID_LOCAL_ITEM_TAG_STRING_MINIMUM       8
 561 #define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM       9
 562 #define HID_LOCAL_ITEM_TAG_DELIMITER            10
 563
 564
 565 static void usb_kbd_show_item(struct hid_item *item)
 566 {
 567         switch(item->type) {
 568                 case HID_ITEM_TYPE_MAIN:
 569                         switch(item->tag) {
 570                                 case HID_MAIN_ITEM_TAG_INPUT:
 571                                         printf("Main Input");
 572                                         break;
 573                                 case HID_MAIN_ITEM_TAG_OUTPUT:
 574                                         printf("Main Output");
 575                                         break;
 576                                 case HID_MAIN_ITEM_TAG_FEATURE:
 577                                         printf("Main Feature");
 578                                         break;
 579                                 case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
 580                                         printf("Main Begin Collection");
 581                                         break;
 582                                 case HID_MAIN_ITEM_TAG_END_COLLECTION:
 583                                         printf("Main End Collection");
 584                                         break;
 585                                 default:
 586                                         printf("Main reserved %d",item->tag);
 587                                         break;
 588                         }
 589                         break;
 590                 case HID_ITEM_TYPE_GLOBAL:
 591                         switch(item->tag) {
 592                                 case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
 593                                         printf("- Global Usage Page");
 594                                         break;
 595                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
 596                                         printf("- Global Logical Minimum");
 597                                         break;
 598                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
 599                                         printf("- Global Logical Maximum");
 600                                         break;
 601                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
 602                                         printf("- Global physical Minimum");
 603                                         break;
 604                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
 605                                         printf("- Global physical Maximum");
 606                                         break;
 607                                 case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
 608                                         printf("- Global Unit Exponent");
 609                                         break;
 610                                 case HID_GLOBAL_ITEM_TAG_UNIT:
 611                                         printf("- Global Unit");
 612                                         break;
 613                                 case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
 614                                         printf("- Global Report Size");
 615                                         break;
 616                                 case HID_GLOBAL_ITEM_TAG_REPORT_ID:
 617                                         printf("- Global Report ID");
 618                                         break;
 619                                 case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
 620                                         printf("- Global Report Count");
 621                                         break;
 622                                 case HID_GLOBAL_ITEM_TAG_PUSH:
 623                                         printf("- Global Push");
 624                                         break;
 625                                 case HID_GLOBAL_ITEM_TAG_POP:
 626                                         printf("- Global Pop");
 627                                         break;
 628                                 default:
 629                                         printf("- Global reserved %d",item->tag);
 630                                         break;
 631                         }
 632                         break;
 633                 case HID_ITEM_TYPE_LOCAL:
 634                         switch(item->tag) {
 635                                 case HID_LOCAL_ITEM_TAG_USAGE:
 636                                         printf("-- Local Usage");
 637                                         break;
 638                                 case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
 639                                         printf("-- Local Usage Minimum");
 640                                         break;
 641                                 case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
 642                                         printf("-- Local Usage Maximum");
 643                                         break;
 644                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX:
 645                                         printf("-- Local Designator Index");
 646                                         break;
 647                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM:
 648                                         printf("-- Local Designator Minimum");
 649                                         break;
 650                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM:
 651                                         printf("-- Local Designator Maximum");
 652                                         break;
 653                                 case HID_LOCAL_ITEM_TAG_STRING_INDEX:
 654                                         printf("-- Local String Index");
 655                                         break;
 656                                 case HID_LOCAL_ITEM_TAG_STRING_MINIMUM:
 657                                         printf("-- Local String Minimum");
 658                                         break;
 659                                 case HID_LOCAL_ITEM_TAG_STRING_MAXIMUM:
 660                                         printf("-- Local String Maximum");
 661                                         break;
 662                                 case HID_LOCAL_ITEM_TAG_DELIMITER:
 663                                         printf("-- Local Delimiter");
 664                                         break;
 665                                 default:
 666                                         printf("-- Local reserved %d",item->tag);
 667                                         break;
 668                         }
 669                         break;
 670                 default:
 671                         printf("--- reserved %d",item->type);
 672                         break;
 673         }
 674         switch(item->size) {
 675                 case 1:
 676                         printf("  %d",item->data.u8);
 677                         break;
 678                 case 2:
 679                         printf("  %d",item->data.u16);
 680                         break;
 681                 case 4:
 682                         printf("  %ld",item->data.u32);
 683                         break;
 684         }
 685         printf("\n");
 686 }
 687
 688
 689 static int usb_kbd_get_hid_desc(struct usb_device *dev)
 690 {
 691         unsigned char buffer[256];
 692         struct usb_descriptor_header *head;
 693         struct usb_config_descriptor *config;
 694         int index,len,i;
 695         unsigned char *start, *end;
 696         struct hid_item item;
 697
 698         if(usb_get_configuration_no(dev,&buffer[0],0)==-1)
 699                 return -1;
 700         head =(struct usb_descriptor_header *)&buffer[0];
 701         if(head->bDescriptorType!=USB_DT_CONFIG) {
 702                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",head->bDescriptorType);
 703                 return -1;
 704         }
 705         index=head->bLength;
 706         config=(struct usb_config_descriptor *)&buffer[0];
 707         len=le16_to_cpu(config->wTotalLength);
 708         /* Ok the first entry must be a configuration entry, now process the others */
 709         head=(struct usb_descriptor_header *)&buffer[index];
 710         while(index+1 < len) {
 711                 if(head->bDescriptorType==USB_DT_HID) {
 712                         printf("HID desc found\n");
 713                         memcpy(&usb_kbd_hid_desc,&buffer[index],buffer[index]);
 714                         le16_to_cpus(&usb_kbd_hid_desc.bcdHID);
 715                         le16_to_cpus(&usb_kbd_hid_desc.wDescriptorLength);
 716                         usb_kbd_display_hid(&usb_kbd_hid_desc);
 717                         len=0;
 718                         break;
 719                 }
 720                 index+=head->bLength;
 721                 head=(struct usb_descriptor_header *)&buffer[index];
 722         }
 723         if(len>0)
 724                 return -1;
 725         len=usb_kbd_hid_desc.wDescriptorLength;
 726         if((index = usb_get_class_descriptor(dev, 0, USB_DT_REPORT, 0, &buffer[0], len)) < 0) {
 727                 printf("reading report descriptor failed\n");
 728                 return -1;
 729         }
 730         printf(" report descriptor (size %u, read %d)\n", len, index);
 731         start = &buffer[0];
 732         end = &buffer[len];
 733         i=0;
 734         do {
 735                 index=fetch_item(start,end,&item);
 736                 i+=index;
 737                 i++;
 738                 if(index>=0)
 739                         usb_kbd_show_item(&item);
 740
 741                 start+=index;
 742                 start++;
 743         } while(index>=0);
 744
 745 }
 746
 747 #endif