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 #ifdef CONFIG_USB_KEYBOARD
  32
  33 #include <usb.h>
  34
  35 #undef USB_KBD_DEBUG
  36 /*
  37  * if overwrite_console returns 1, the stdin, stderr and stdout
  38  * are switched to the serial port, else the settings in the
  39  * environment are used
  40  */
  41 #ifdef CFG_CONSOLE_OVERWRITE_ROUTINE
  42 extern int overwrite_console (void);
  43 #else
  44 int overwrite_console (void)
  45 {
  46         return (0);
  47 }
  48 #endif
  49
  50 #ifdef  USB_KBD_DEBUG
  51 #define USB_KBD_PRINTF(fmt,args...)     printf (fmt ,##args)
  52 #else
  53 #define USB_KBD_PRINTF(fmt,args...)
  54 #endif
  55
  56
  57 #define REPEAT_RATE  40/4 /* 40msec -> 25cps */
  58 #define REPEAT_DELAY 10 /* 10 x REAPEAT_RATE = 400msec */
  59
  60 #define NUM_LOCK        0x53
  61 #define CAPS_LOCK 0x39
  62 #define SCROLL_LOCK 0x47
  63
  64
  65 /* Modifier bits */
  66 #define LEFT_CNTR               0
  67 #define LEFT_SHIFT      1
  68 #define LEFT_ALT                2
  69 #define LEFT_GUI                3
  70 #define RIGHT_CNTR      4
  71 #define RIGHT_SHIFT     5
  72 #define RIGHT_ALT               6
  73 #define RIGHT_GUI               7
  74
  75 #define USB_KBD_BUFFER_LEN 0x20  /* size of the keyboardbuffer */
  76
  77 static volatile char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
  78 static volatile int usb_in_pointer = 0;
  79 static volatile int usb_out_pointer = 0;
  80
  81 unsigned char new[8];
  82 unsigned char old[8];
  83 int repeat_delay;
  84 #define DEVNAME "usbkbd"
  85 static unsigned char num_lock = 0;
  86 static unsigned char caps_lock = 0;
  87 static unsigned char scroll_lock = 0;
  88 static unsigned char ctrl = 0;
  89
  90 static unsigned char leds __attribute__ ((aligned (0x4)));
  91
  92 static unsigned char usb_kbd_numkey[] = {
  93          '1', '2', '3', '4', '5', '6', '7', '8', '9', '0','\r',0x1b,'\b','\t',' ', '-',
  94          '=', '[', ']','\\', '#', ';', '\'', '`', ',', '.', '/'
  95 };
  96 static unsigned char usb_kbd_numkey_shifted[] = {
  97          '!', '@', '#', '$', '%', '^', '&', '*', '(', ')','\r',0x1b,'\b','\t',' ', '_',
  98          '+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?'
  99 };
 100
 101 /******************************************************************
 102  * Queue handling
 103  ******************************************************************/
 104 /* puts character in the queue and sets up the in and out pointer */
 105 static void usb_kbd_put_queue(char data)
 106 {
 107         if((usb_in_pointer+1)==USB_KBD_BUFFER_LEN) {
 108                 if(usb_out_pointer==0) {
 109                         return; /* buffer full */
 110                 } else{
 111                         usb_in_pointer=0;
 112                 }
 113         } else {
 114                 if((usb_in_pointer+1)==usb_out_pointer)
 115                         return; /* buffer full */
 116                 usb_in_pointer++;
 117         }
 118         usb_kbd_buffer[usb_in_pointer]=data;
 119         return;
 120 }
 121
 122 /* test if a character is in the queue */
 123 static int usb_kbd_testc(void)
 124 {
 125 #ifdef CFG_USB_EVENT_POLL
 126         usb_event_poll();
 127 #endif
 128         if(usb_in_pointer==usb_out_pointer)
 129                 return(0); /* no data */
 130         else
 131                 return(1);
 132 }
 133 /* gets the character from the queue */
 134 static int usb_kbd_getc(void)
 135 {
 136         char c;
 137         while(usb_in_pointer==usb_out_pointer) {
 138 #ifdef CFG_USB_EVENT_POLL
 139                 usb_event_poll();
 140 #endif
 141         }
 142         if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
 143                 usb_out_pointer=0;
 144         else
 145                 usb_out_pointer++;
 146         c=usb_kbd_buffer[usb_out_pointer];
 147         return (int)c;
 148
 149 }
 150
 151 /* forward decleration */
 152 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
 153
 154 /* search for keyboard and register it if found */
 155 int drv_usb_kbd_init(void)
 156 {
 157         int error,i,index;
 158         device_t usb_kbd_dev,*old_dev;
 159         struct usb_device *dev;
 160         char *stdinname  = getenv ("stdin");
 161
 162         usb_in_pointer=0;
 163         usb_out_pointer=0;
 164         /* scan all USB Devices */
 165         for(i=0;i<USB_MAX_DEVICE;i++) {
 166                 dev=usb_get_dev_index(i); /* get device */
 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                                 for (index=1; index<=ListNumItems(devlist); index++) {
 172                                         old_dev = ListGetPtrToItem(devlist, index);
 173                                         if(strcmp(old_dev->name,DEVNAME)==0) {
 174                                                 /* ok, already registered, just return ok */
 175                                                 USB_KBD_PRINTF("USB KBD is already registered.\n");
 176                                                 return 1;
 177                                         }
 178                                 }
 179                                 /* register the keyboard */
 180                                 USB_KBD_PRINTF("USB KBD register.\n");
 181                                 memset (&usb_kbd_dev, 0, sizeof(device_t));
 182                                 strcpy(usb_kbd_dev.name, DEVNAME);
 183                                 usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 184                                 usb_kbd_dev.putc = NULL;
 185                                 usb_kbd_dev.puts = NULL;
 186                                 usb_kbd_dev.getc = usb_kbd_getc;
 187                                 usb_kbd_dev.tstc = usb_kbd_testc;
 188                                 error = device_register (&usb_kbd_dev);
 189                                 if(error==0) {
 190                                         /* check if this is the standard input device */
 191                                         if(strcmp(stdinname,DEVNAME)==0) {
 192                                                 /* reassign the console */
 193                                                 if(overwrite_console()) {
 194                                                         return 1;
 195                                                 }
 196                                                 error=console_assign(stdin,DEVNAME);
 197                                                 if(error==0)
 198                                                         return 1;
 199                                                 else
 200                                                         return error;
 201                                         }
 202                                         return 1;
 203                                 }
 204                                 return error;
 205                         }
 206                 }
 207         }
 208         /* no USB Keyboard found */
 209         return -1;
 210 }
 211
 212
 213 /* deregistering the keyboard */
 214 int usb_kbd_deregister(void)
 215 {
 216         return device_deregister(DEVNAME);
 217 }
 218
 219 /**************************************************************************
 220  * Low Level drivers
 221  */
 222
 223 /* set the LEDs. Since this is used in the irq routine, the control job
 224    is issued with a timeout of 0. This means, that the job is queued without
 225    waiting for job completion */
 226
 227 static void usb_kbd_setled(struct usb_device *dev)
 228 {
 229         struct usb_interface_descriptor *iface;
 230         iface = &dev->config.if_desc[0];
 231         leds=0;
 232         if(scroll_lock!=0)
 233                 leds|=1;
 234         leds<<=1;
 235         if(caps_lock!=0)
 236                 leds|=1;
 237         leds<<=1;
 238         if(num_lock!=0)
 239                 leds|=1;
 240         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 241                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 242                 0x200, iface->bInterfaceNumber,(void *)&leds, 1, 0);
 243
 244 }
 245
 246
 247 #define CAPITAL_MASK 0x20
 248 /* Translate the scancode in ASCII */
 249 static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int pressed)
 250 {
 251         unsigned char keycode;
 252
 253         if(pressed==0) {
 254                 /* key released */
 255                 repeat_delay=0;
 256                 return 0;
 257         }
 258         if(pressed==2) {
 259                 repeat_delay++;
 260                 if(repeat_delay<REPEAT_DELAY)
 261                         return 0;
 262                 repeat_delay=REPEAT_DELAY;
 263         }
 264         keycode=0;
 265         if((scancode>3) && (scancode<=0x1d)) { /* alpha numeric values */
 266                 keycode=scancode-4 + 0x61;
 267                 if(caps_lock)
 268                         keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 269                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) {
 270                         if(keycode & CAPITAL_MASK)
 271                                 keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 272                         else
 273                                 keycode|=CAPITAL_MASK; /* switch to non capital Letters */
 274                 }
 275         }
 276         if((scancode>0x1d) && (scancode<0x3A)) {
 277                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0))  /* shifted */
 278                         keycode=usb_kbd_numkey_shifted[scancode-0x1e];
 279                 else /* non shifted */
 280                         keycode=usb_kbd_numkey[scancode-0x1e];
 281         }
 282
 283         if (ctrl)
 284                 keycode = scancode - 0x3;
 285
 286         if(pressed==1) {
 287                 if(scancode==NUM_LOCK) {
 288                         num_lock=~num_lock;
 289                         return 1;
 290                 }
 291                 if(scancode==CAPS_LOCK) {
 292                         caps_lock=~caps_lock;
 293                         return 1;
 294                 }
 295                 if(scancode==SCROLL_LOCK) {
 296                         scroll_lock=~scroll_lock;
 297                         return 1;
 298                 }
 299         }
 300         if(keycode!=0) {
 301                 USB_KBD_PRINTF("%c",keycode);
 302                 usb_kbd_put_queue(keycode);
 303         }
 304         return 0;
 305 }
 306
 307 /* Interrupt service routine */
 308 static int usb_kbd_irq(struct usb_device *dev)
 309 {
 310         int i,res;
 311
 312         if((dev->irq_status!=0)||(dev->irq_act_len!=8))
 313         {
 314                 USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
 315                 return 1;
 316         }
 317         res=0;
 318
 319         switch (new[0]) {
 320         case 0x0:       /* No combo key pressed */
 321                 ctrl = 0;
 322                 break;
 323         case 0x01:      /* Left Ctrl pressed */
 324         case 0x10:      /* Right Ctrl pressed */
 325                 ctrl = 1;
 326                 break;
 327         }
 328
 329         for (i = 2; i < 8; i++) {
 330                 if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8]) {
 331                         res|=usb_kbd_translate(old[i],new[0],0);
 332                 }
 333                 if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8]) {
 334                         res|=usb_kbd_translate(new[i],new[0],1);
 335                 }
 336         }
 337         if((new[2]>3) && (old[2]==new[2])) /* still pressed */
 338                 res|=usb_kbd_translate(new[2],new[0],2);
 339         if(res==1)
 340                 usb_kbd_setled(dev);
 341         memcpy(&old[0],&new[0], 8);
 342         return 1; /* install IRQ Handler again */
 343 }
 344
 345 /* probes the USB device dev for keyboard type */
 346 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 347 {
 348         struct usb_interface_descriptor *iface;
 349         struct usb_endpoint_descriptor *ep;
 350         int pipe,maxp;
 351
 352         if (dev->descriptor.bNumConfigurations != 1) return 0;
 353         iface = &dev->config.if_desc[ifnum];
 354
 355         if (iface->bInterfaceClass != 3) return 0;
 356         if (iface->bInterfaceSubClass != 1) return 0;
 357         if (iface->bInterfaceProtocol != 1) return 0;
 358         if (iface->bNumEndpoints != 1) return 0;
 359
 360         ep = &iface->ep_desc[0];
 361
 362         if (!(ep->bEndpointAddress & 0x80)) return 0;
 363         if ((ep->bmAttributes & 3) != 3) return 0;
 364         USB_KBD_PRINTF("USB KBD found set protocol...\n");
 365         /* ok, we found a USB Keyboard, install it */
 366         /* usb_kbd_get_hid_desc(dev); */
 367         usb_set_protocol(dev, iface->bInterfaceNumber, 0);
 368         USB_KBD_PRINTF("USB KBD found set idle...\n");
 369         usb_set_idle(dev, iface->bInterfaceNumber, REPEAT_RATE, 0);
 370         memset(&new[0], 0, 8);
 371         memset(&old[0], 0, 8);
 372         repeat_delay=0;
 373         pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 374         maxp = usb_maxpacket(dev, pipe);
 375         dev->irq_handle=usb_kbd_irq;
 376         USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
 377         usb_submit_int_msg(dev,pipe,&new[0], maxp > 8 ? 8 : maxp,ep->bInterval);
 378         return 1;
 379 }
 380
 381
 382 #if 0
 383 struct usb_hid_descriptor {
 384         unsigned char  bLength;
 385         unsigned char  bDescriptorType; /* 0x21 for HID */
 386         unsigned short bcdHID; /* release number */
 387         unsigned char  bCountryCode;
 388         unsigned char  bNumDescriptors;
 389         unsigned char  bReportDescriptorType;
 390         unsigned short wDescriptorLength;
 391 } __attribute__ ((packed));
 392
 393 /*
 394  * We parse each description item into this structure. Short items data
 395  * values are expanded to 32-bit signed int, long items contain a pointer
 396  * into the data area.
 397  */
 398
 399 struct hid_item {
 400         unsigned char format;
 401         unsigned char size;
 402         unsigned char type;
 403         unsigned char tag;
 404         union {
 405             unsigned char   u8;
 406             char            s8;
 407             unsigned short  u16;
 408             short           s16;
 409             unsigned long   u32;
 410             long            s32;
 411             unsigned char  *longdata;
 412         } data;
 413 };
 414
 415 /*
 416  * HID report item format
 417  */
 418
 419 #define HID_ITEM_FORMAT_SHORT   0
 420 #define HID_ITEM_FORMAT_LONG    1
 421
 422 /*
 423  * Special tag indicating long items
 424  */
 425
 426 #define HID_ITEM_TAG_LONG       15
 427
 428
 429 static struct usb_hid_descriptor usb_kbd_hid_desc;
 430
 431 void usb_kbd_display_hid(struct usb_hid_descriptor *hid)
 432 {
 433         printf("USB_HID_DESC:\n");
 434         printf("  bLenght               0x%x\n",hid->bLength);
 435         printf("  bcdHID                0x%x\n",hid->bcdHID);
 436         printf("  bCountryCode          %d\n",hid->bCountryCode);
 437         printf("  bNumDescriptors       0x%x\n",hid->bNumDescriptors);
 438         printf("  bReportDescriptorType 0x%x\n",hid->bReportDescriptorType);
 439         printf("  wDescriptorLength     0x%x\n",hid->wDescriptorLength);
 440 }
 441
 442
 443 /*
 444  * Fetch a report description item from the data stream. We support long
 445  * items, though they are not used yet.
 446  */
 447
 448 static int fetch_item(unsigned char *start,unsigned char *end, struct hid_item *item)
 449 {
 450         if((end - start) > 0) {
 451                 unsigned char b = *start++;
 452                 item->type = (b >> 2) & 3;
 453                 item->tag  = (b >> 4) & 15;
 454                 if (item->tag == HID_ITEM_TAG_LONG) {
 455                         item->format = HID_ITEM_FORMAT_LONG;
 456                         if ((end - start) >= 2) {
 457                                 item->size = *start++;
 458                                 item->tag  = *start++;
 459                                 if ((end - start) >= item->size) {
 460                                         item->data.longdata = start;
 461                                         start += item->size;
 462                                         return item->size;
 463                                 }
 464                         }
 465                 } else {
 466                         item->format = HID_ITEM_FORMAT_SHORT;
 467                         item->size = b & 3;
 468                         switch (item->size) {
 469                                 case 0:
 470                                         return item->size;
 471                                 case 1:
 472                                         if ((end - start) >= 1) {
 473                                                 item->data.u8 = *start++;
 474                                                 return item->size;
 475                                         }
 476                                         break;
 477                                 case 2:
 478                                         if ((end - start) >= 2) {
 479                                                 item->data.u16 = le16_to_cpu((unsigned short *)start);
 480                                                 start+=2;
 481                                                 return item->size;
 482                                         }
 483                                 case 3:
 484                                         item->size++;
 485                                         if ((end - start) >= 4) {
 486                                                 item->data.u32 = le32_to_cpu((unsigned long *)start);
 487                                                 start+=4;
 488                                                 return item->size;
 489                                         }
 490                         }
 491                 }
 492         }
 493         return -1;
 494 }
 495
 496 /*
 497  * HID report descriptor item type (prefix bit 2,3)
 498  */
 499
 500 #define HID_ITEM_TYPE_MAIN              0
 501 #define HID_ITEM_TYPE_GLOBAL            1
 502 #define HID_ITEM_TYPE_LOCAL             2
 503 #define HID_ITEM_TYPE_RESERVED          3
 504 /*
 505  * HID report descriptor main item tags
 506  */
 507
 508 #define HID_MAIN_ITEM_TAG_INPUT                 8
 509 #define HID_MAIN_ITEM_TAG_OUTPUT                9
 510 #define HID_MAIN_ITEM_TAG_FEATURE               11
 511 #define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION      10
 512 #define HID_MAIN_ITEM_TAG_END_COLLECTION        12
 513 /*
 514  * HID report descriptor main item contents
 515  */
 516
 517 #define HID_MAIN_ITEM_CONSTANT          0x001
 518 #define HID_MAIN_ITEM_VARIABLE          0x002
 519 #define HID_MAIN_ITEM_RELATIVE          0x004
 520 #define HID_MAIN_ITEM_WRAP              0x008
 521 #define HID_MAIN_ITEM_NONLINEAR         0x010
 522 #define HID_MAIN_ITEM_NO_PREFERRED      0x020
 523 #define HID_MAIN_ITEM_NULL_STATE        0x040
 524 #define HID_MAIN_ITEM_VOLATILE          0x080
 525 #define HID_MAIN_ITEM_BUFFERED_BYTE     0x100
 526
 527 /*
 528  * HID report descriptor collection item types
 529  */
 530
 531 #define HID_COLLECTION_PHYSICAL         0
 532 #define HID_COLLECTION_APPLICATION      1
 533 #define HID_COLLECTION_LOGICAL          2
 534 /*
 535  * HID report descriptor global item tags
 536  */
 537
 538 #define HID_GLOBAL_ITEM_TAG_USAGE_PAGE          0
 539 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM     1
 540 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM     2
 541 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM    3
 542 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM    4
 543 #define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT       5
 544 #define HID_GLOBAL_ITEM_TAG_UNIT                6
 545 #define HID_GLOBAL_ITEM_TAG_REPORT_SIZE         7
 546 #define HID_GLOBAL_ITEM_TAG_REPORT_ID           8
 547 #define HID_GLOBAL_ITEM_TAG_REPORT_COUNT        9
 548 #define HID_GLOBAL_ITEM_TAG_PUSH                10
 549 #define HID_GLOBAL_ITEM_TAG_POP                 11
 550
 551 /*
 552  * HID report descriptor local item tags
 553  */
 554
 555 #define HID_LOCAL_ITEM_TAG_USAGE                0
 556 #define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM        1
 557 #define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM        2
 558 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX     3
 559 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM   4
 560 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM   5
 561 #define HID_LOCAL_ITEM_TAG_STRING_INDEX         7
 562 #define HID_LOCAL_ITEM_TAG_STRING_MINIMUM       8
 563 #define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM       9
 564 #define HID_LOCAL_ITEM_TAG_DELIMITER            10
 565
 566
 567 static void usb_kbd_show_item(struct hid_item *item)
 568 {
 569         switch(item->type) {
 570                 case HID_ITEM_TYPE_MAIN:
 571                         switch(item->tag) {
 572                                 case HID_MAIN_ITEM_TAG_INPUT:
 573                                         printf("Main Input");
 574                                         break;
 575                                 case HID_MAIN_ITEM_TAG_OUTPUT:
 576                                         printf("Main Output");
 577                                         break;
 578                                 case HID_MAIN_ITEM_TAG_FEATURE:
 579                                         printf("Main Feature");
 580                                         break;
 581                                 case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
 582                                         printf("Main Begin Collection");
 583                                         break;
 584                                 case HID_MAIN_ITEM_TAG_END_COLLECTION:
 585                                         printf("Main End Collection");
 586                                         break;
 587                                 default:
 588                                         printf("Main reserved %d",item->tag);
 589                                         break;
 590                         }
 591                         break;
 592                 case HID_ITEM_TYPE_GLOBAL:
 593                         switch(item->tag) {
 594                                 case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
 595                                         printf("- Global Usage Page");
 596                                         break;
 597                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
 598                                         printf("- Global Logical Minimum");
 599                                         break;
 600                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
 601                                         printf("- Global Logical Maximum");
 602                                         break;
 603                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
 604                                         printf("- Global physical Minimum");
 605                                         break;
 606                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
 607                                         printf("- Global physical Maximum");
 608                                         break;
 609                                 case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
 610                                         printf("- Global Unit Exponent");
 611                                         break;
 612                                 case HID_GLOBAL_ITEM_TAG_UNIT:
 613                                         printf("- Global Unit");
 614                                         break;
 615                                 case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
 616                                         printf("- Global Report Size");
 617                                         break;
 618                                 case HID_GLOBAL_ITEM_TAG_REPORT_ID:
 619                                         printf("- Global Report ID");
 620                                         break;
 621                                 case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
 622                                         printf("- Global Report Count");
 623                                         break;
 624                                 case HID_GLOBAL_ITEM_TAG_PUSH:
 625                                         printf("- Global Push");
 626                                         break;
 627                                 case HID_GLOBAL_ITEM_TAG_POP:
 628                                         printf("- Global Pop");
 629                                         break;
 630                                 default:
 631                                         printf("- Global reserved %d",item->tag);
 632                                         break;
 633                         }
 634                         break;
 635                 case HID_ITEM_TYPE_LOCAL:
 636                         switch(item->tag) {
 637                                 case HID_LOCAL_ITEM_TAG_USAGE:
 638                                         printf("-- Local Usage");
 639                                         break;
 640                                 case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
 641                                         printf("-- Local Usage Minimum");
 642                                         break;
 643                                 case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
 644                                         printf("-- Local Usage Maximum");
 645                                         break;
 646                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX:
 647                                         printf("-- Local Designator Index");
 648                                         break;
 649                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM:
 650                                         printf("-- Local Designator Minimum");
 651                                         break;
 652                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM:
 653                                         printf("-- Local Designator Maximum");
 654                                         break;
 655                                 case HID_LOCAL_ITEM_TAG_STRING_INDEX:
 656                                         printf("-- Local String Index");
 657                                         break;
 658                                 case HID_LOCAL_ITEM_TAG_STRING_MINIMUM:
 659                                         printf("-- Local String Minimum");
 660                                         break;
 661                                 case HID_LOCAL_ITEM_TAG_STRING_MAXIMUM:
 662                                         printf("-- Local String Maximum");
 663                                         break;
 664                                 case HID_LOCAL_ITEM_TAG_DELIMITER:
 665                                         printf("-- Local Delimiter");
 666                                         break;
 667                                 default:
 668                                         printf("-- Local reserved %d",item->tag);
 669                                         break;
 670                         }
 671                         break;
 672                 default:
 673                         printf("--- reserved %d",item->type);
 674                         break;
 675         }
 676         switch(item->size) {
 677                 case 1:
 678                         printf("  %d",item->data.u8);
 679                         break;
 680                 case 2:
 681                         printf("  %d",item->data.u16);
 682                         break;
 683                 case 4:
 684                         printf("  %ld",item->data.u32);
 685                         break;
 686         }
 687         printf("\n");
 688 }
 689
 690
 691 static int usb_kbd_get_hid_desc(struct usb_device *dev)
 692 {
 693         unsigned char buffer[256];
 694         struct usb_descriptor_header *head;
 695         struct usb_config_descriptor *config;
 696         int index,len,i;
 697         unsigned char *start, *end;
 698         struct hid_item item;
 699
 700         if(usb_get_configuration_no(dev,&buffer[0],0)==-1)
 701                 return -1;
 702         head =(struct usb_descriptor_header *)&buffer[0];
 703         if(head->bDescriptorType!=USB_DT_CONFIG) {
 704                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",head->bDescriptorType);
 705                 return -1;
 706         }
 707         index=head->bLength;
 708         config=(struct usb_config_descriptor *)&buffer[0];
 709         len=le16_to_cpu(config->wTotalLength);
 710         /* Ok the first entry must be a configuration entry, now process the others */
 711         head=(struct usb_descriptor_header *)&buffer[index];
 712         while(index+1 < len) {
 713                 if(head->bDescriptorType==USB_DT_HID) {
 714                         printf("HID desc found\n");
 715                         memcpy(&usb_kbd_hid_desc,&buffer[index],buffer[index]);
 716                         le16_to_cpus(&usb_kbd_hid_desc.bcdHID);
 717                         le16_to_cpus(&usb_kbd_hid_desc.wDescriptorLength);
 718                         usb_kbd_display_hid(&usb_kbd_hid_desc);
 719                         len=0;
 720                         break;
 721                 }
 722                 index+=head->bLength;
 723                 head=(struct usb_descriptor_header *)&buffer[index];
 724         }
 725         if(len>0)
 726                 return -1;
 727         len=usb_kbd_hid_desc.wDescriptorLength;
 728         if((index = usb_get_class_descriptor(dev, 0, USB_DT_REPORT, 0, &buffer[0], len)) < 0) {
 729                 printf("reading report descriptor failed\n");
 730                 return -1;
 731         }
 732         printf(" report descriptor (size %u, read %d)\n", len, index);
 733         start = &buffer[0];
 734         end = &buffer[len];
 735         i=0;
 736         do {
 737                 index=fetch_item(start,end,&item);
 738                 i+=index;
 739                 i++;
 740                 if(index>=0)
 741                         usb_kbd_show_item(&item);
 742
 743                 start+=index;
 744                 start++;
 745         } while(index>=0);
 746
 747 }
 748
 749
 750 #endif
 751
 752 #endif /* CONFIG_USB_KEYBOARD */