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
  30 #ifdef CONFIG_USB_KEYBOARD
  31
  32 #include <usb.h>
  33
  34 #undef USB_KBD_DEBUG
  35 /*
  36  * if overwrite_console returns 1, the stdin, stderr and stdout
  37  * are switched to the serial port, else the settings in the
  38  * environment are used
  39  */
  40 #ifdef CFG_CONSOLE_OVERWRITE_ROUTINE
  41 extern int overwrite_console (void);
  42 #else
  43 int overwrite_console (void)
  44 {
  45         return (0);
  46 }
  47 #endif
  48
  49 #ifdef  USB_KBD_DEBUG
  50 #define USB_KBD_PRINTF(fmt,args...)     printf (fmt ,##args)
  51 #else
  52 #define USB_KBD_PRINTF(fmt,args...)
  53 #endif
  54
  55
  56 #define REPEAT_RATE  40/4 /* 40msec -> 25cps */
  57 #define REPEAT_DELAY 10 /* 10 x REAPEAT_RATE = 400msec */
  58
  59 #define NUM_LOCK        0x53
  60 #define CAPS_LOCK 0x39
  61 #define SCROLL_LOCK 0x47
  62
  63
  64 /* Modifier bits */
  65 #define LEFT_CNTR               0
  66 #define LEFT_SHIFT      1
  67 #define LEFT_ALT                2
  68 #define LEFT_GUI                3
  69 #define RIGHT_CNTR      4
  70 #define RIGHT_SHIFT     5
  71 #define RIGHT_ALT               6
  72 #define RIGHT_GUI               7
  73
  74 #define USB_KBD_BUFFER_LEN 0x20  /* size of the keyboardbuffer */
  75
  76 static volatile char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
  77 static volatile int usb_in_pointer = 0;
  78 static volatile int usb_out_pointer = 0;
  79
  80 unsigned char new[8];
  81 unsigned char old[8];
  82 int repeat_delay;
  83 #define DEVNAME "usbkbd"
  84 static unsigned char num_lock = 0;
  85 static unsigned char caps_lock = 0;
  86 static unsigned char scroll_lock = 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         if(usb_in_pointer==usb_out_pointer)
 124                 return(0); /* no data */
 125         else
 126                 return(1);
 127 }
 128 /* gets the character from the queue */
 129 static int usb_kbd_getc(void)
 130 {
 131         char c;
 132         while(usb_in_pointer==usb_out_pointer);
 133         if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
 134                 usb_out_pointer=0;
 135         else
 136                 usb_out_pointer++;
 137         c=usb_kbd_buffer[usb_out_pointer];
 138         return (int)c;
 139
 140 }
 141
 142 /* forward decleration */
 143 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
 144
 145 /* search for keyboard and register it if found */
 146 int drv_usb_kbd_init(void)
 147 {
 148         int error,i,index;
 149         device_t usb_kbd_dev,*old_dev;
 150         struct usb_device *dev;
 151         char *stdinname  = getenv ("stdin");
 152
 153         usb_in_pointer=0;
 154         usb_out_pointer=0;
 155         /* scan all USB Devices */
 156         for(i=0;i<USB_MAX_DEVICE;i++) {
 157                 dev=usb_get_dev_index(i); /* get device */
 158                 if(dev->devnum!=-1) {
 159                         if(usb_kbd_probe(dev,0)==1) { /* Ok, we found a keyboard */
 160                                 /* check, if it is already registered */
 161                                 USB_KBD_PRINTF("USB KBD found set up device.\n");
 162                                 for (index=1; index<=ListNumItems(devlist); index++) {
 163                                         old_dev = ListGetPtrToItem(devlist, index);
 164                                         if(strcmp(old_dev->name,DEVNAME)==0) {
 165                                                 /* ok, already registered, just return ok */
 166                                                 USB_KBD_PRINTF("USB KBD is already registered.\n");
 167                                                 return 1;
 168                                         }
 169                                 }
 170                                 /* register the keyboard */
 171                                 USB_KBD_PRINTF("USB KBD register.\n");
 172                                 memset (&usb_kbd_dev, 0, sizeof(device_t));
 173                                 strcpy(usb_kbd_dev.name, DEVNAME);
 174                                 usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 175                                 usb_kbd_dev.putc = NULL;
 176                                 usb_kbd_dev.puts = NULL;
 177                                 usb_kbd_dev.getc = usb_kbd_getc;
 178                                 usb_kbd_dev.tstc = usb_kbd_testc;
 179                                 error = device_register (&usb_kbd_dev);
 180                                 if(error==0) {
 181                                         /* check if this is the standard input device */
 182                                         if(strcmp(stdinname,DEVNAME)==0) {
 183                                                 /* reassign the console */
 184                                                 if(overwrite_console()) {
 185                                                         return 1;
 186                                                 }
 187                                                 error=console_assign(stdin,DEVNAME);
 188                                                 if(error==0)
 189                                                         return 1;
 190                                                 else
 191                                                         return error;
 192                                         }
 193                                         return 1;
 194                                 }
 195                                 return error;
 196                         }
 197                 }
 198         }
 199         /* no USB Keyboard found */
 200         return -1;
 201 }
 202
 203
 204 /* deregistering the keyboard */
 205 int usb_kbd_deregister(void)
 206 {
 207         return device_deregister(DEVNAME);
 208 }
 209
 210 /**************************************************************************
 211  * Low Level drivers
 212  */
 213
 214 /* set the LEDs. Since this is used in the irq routine, the control job
 215    is issued with a timeout of 0. This means, that the job is queued without
 216    waiting for job completion */
 217
 218 static void usb_kbd_setled(struct usb_device *dev)
 219 {
 220         struct usb_interface_descriptor *iface;
 221         iface = &dev->config.if_desc[0];
 222         leds=0;
 223         if(scroll_lock!=0)
 224                 leds|=1;
 225         leds<<=1;
 226         if(caps_lock!=0)
 227                 leds|=1;
 228         leds<<=1;
 229         if(num_lock!=0)
 230                 leds|=1;
 231         usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 232                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 233                 0x200, iface->bInterfaceNumber,(void *)&leds, 1, 0);
 234
 235 }
 236
 237
 238 #define CAPITAL_MASK 0x20
 239 /* Translate the scancode in ASCII */
 240 static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int pressed)
 241 {
 242         unsigned char keycode;
 243
 244         if(pressed==0) {
 245                 /* key released */
 246                 repeat_delay=0;
 247                 return 0;
 248         }
 249         if(pressed==2) {
 250                 repeat_delay++;
 251                 if(repeat_delay<REPEAT_DELAY)
 252                         return 0;
 253                 repeat_delay=REPEAT_DELAY;
 254         }
 255         keycode=0;
 256         if((scancode>3) && (scancode<0x1d)) { /* alpha numeric values */
 257                 keycode=scancode-4 + 0x61;
 258                 if(caps_lock)
 259                         keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 260                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) {
 261                         if(keycode & CAPITAL_MASK)
 262                                 keycode&=~CAPITAL_MASK; /* switch to capital Letters */
 263                         else
 264                                 keycode|=CAPITAL_MASK; /* switch to non capital Letters */
 265                 }
 266         }
 267         if((scancode>0x1d) && (scancode<0x3A)) {
 268                 if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0))  /* shifted */
 269                         keycode=usb_kbd_numkey_shifted[scancode-0x1e];
 270                 else /* non shifted */
 271                         keycode=usb_kbd_numkey[scancode-0x1e];
 272         }
 273         if(pressed==1) {
 274                 if(scancode==NUM_LOCK) {
 275                         num_lock=~num_lock;
 276                         return 1;
 277                 }
 278                 if(scancode==CAPS_LOCK) {
 279                         caps_lock=~caps_lock;
 280                         return 1;
 281                 }
 282                 if(scancode==SCROLL_LOCK) {
 283                         scroll_lock=~scroll_lock;
 284                         return 1;
 285                 }
 286         }
 287         if(keycode!=0) {
 288                 USB_KBD_PRINTF("%c",keycode);
 289                 usb_kbd_put_queue(keycode);
 290         }
 291         return 0;
 292 }
 293
 294 /* Interrupt service routine */
 295 static int usb_kbd_irq(struct usb_device *dev)
 296 {
 297         int i,res;
 298
 299         if((dev->irq_status!=0)||(dev->irq_act_len!=8))
 300         {
 301                 USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
 302                 return 1;
 303         }
 304         res=0;
 305         for (i = 2; i < 8; i++) {
 306                 if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8]) {
 307                         res|=usb_kbd_translate(old[i],new[0],0);
 308                 }
 309                 if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8]) {
 310                         res|=usb_kbd_translate(new[i],new[0],1);
 311                 }
 312         }
 313         if((new[2]>3) && (old[2]==new[2])) /* still pressed */
 314                 res|=usb_kbd_translate(new[2],new[0],2);
 315         if(res==1)
 316                 usb_kbd_setled(dev);
 317         memcpy(&old[0],&new[0], 8);
 318         return 1; /* install IRQ Handler again */
 319 }
 320
 321 /* probes the USB device dev for keyboard type */
 322 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 323 {
 324         struct usb_interface_descriptor *iface;
 325         struct usb_endpoint_descriptor *ep;
 326         int pipe,maxp;
 327
 328         if (dev->descriptor.bNumConfigurations != 1) return 0;
 329         iface = &dev->config.if_desc[ifnum];
 330
 331         if (iface->bInterfaceClass != 3) return 0;
 332         if (iface->bInterfaceSubClass != 1) return 0;
 333         if (iface->bInterfaceProtocol != 1) return 0;
 334         if (iface->bNumEndpoints != 1) return 0;
 335
 336         ep = &iface->ep_desc[0];
 337
 338         if (!(ep->bEndpointAddress & 0x80)) return 0;
 339         if ((ep->bmAttributes & 3) != 3) return 0;
 340         USB_KBD_PRINTF("USB KBD found set protocol...\n");
 341         /* ok, we found a USB Keyboard, install it */
 342         /* usb_kbd_get_hid_desc(dev); */
 343         usb_set_protocol(dev, iface->bInterfaceNumber, 0);
 344         USB_KBD_PRINTF("USB KBD found set idle...\n");
 345         usb_set_idle(dev, iface->bInterfaceNumber, REPEAT_RATE, 0);
 346         memset(&new[0], 0, 8);
 347         memset(&old[0], 0, 8);
 348         repeat_delay=0;
 349         pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 350         maxp = usb_maxpacket(dev, pipe);
 351         dev->irq_handle=usb_kbd_irq;
 352         USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
 353         usb_submit_int_msg(dev,pipe,&new[0], maxp > 8 ? 8 : maxp,ep->bInterval);
 354         return 1;
 355 }
 356
 357
 358 #if 0
 359 struct usb_hid_descriptor {
 360         unsigned char  bLength;
 361         unsigned char  bDescriptorType; /* 0x21 for HID */
 362         unsigned short bcdHID; /* release number */
 363         unsigned char  bCountryCode;
 364         unsigned char  bNumDescriptors;
 365         unsigned char  bReportDescriptorType;
 366         unsigned short wDescriptorLength;
 367 } __attribute__ ((packed));
 368
 369 /*
 370  * We parse each description item into this structure. Short items data
 371  * values are expanded to 32-bit signed int, long items contain a pointer
 372  * into the data area.
 373  */
 374
 375 struct hid_item {
 376         unsigned char format;
 377         unsigned char size;
 378         unsigned char type;
 379         unsigned char tag;
 380         union {
 381             unsigned char   u8;
 382             char            s8;
 383             unsigned short  u16;
 384             short           s16;
 385             unsigned long   u32;
 386             long            s32;
 387             unsigned char  *longdata;
 388         } data;
 389 };
 390
 391 /*
 392  * HID report item format
 393  */
 394
 395 #define HID_ITEM_FORMAT_SHORT   0
 396 #define HID_ITEM_FORMAT_LONG    1
 397
 398 /*
 399  * Special tag indicating long items
 400  */
 401
 402 #define HID_ITEM_TAG_LONG       15
 403
 404
 405 static struct usb_hid_descriptor usb_kbd_hid_desc;
 406
 407 void usb_kbd_display_hid(struct usb_hid_descriptor *hid)
 408 {
 409         printf("USB_HID_DESC:\n");
 410         printf("  bLenght               0x%x\n",hid->bLength);
 411         printf("  bcdHID                0x%x\n",hid->bcdHID);
 412         printf("  bCountryCode          %d\n",hid->bCountryCode);
 413         printf("  bNumDescriptors       0x%x\n",hid->bNumDescriptors);
 414         printf("  bReportDescriptorType 0x%x\n",hid->bReportDescriptorType);
 415         printf("  wDescriptorLength     0x%x\n",hid->wDescriptorLength);
 416 }
 417
 418
 419 /*
 420  * Fetch a report description item from the data stream. We support long
 421  * items, though they are not used yet.
 422  */
 423
 424 static int fetch_item(unsigned char *start,unsigned char *end, struct hid_item *item)
 425 {
 426         if((end - start) > 0) {
 427                 unsigned char b = *start++;
 428                 item->type = (b >> 2) & 3;
 429                 item->tag  = (b >> 4) & 15;
 430                 if (item->tag == HID_ITEM_TAG_LONG) {
 431                         item->format = HID_ITEM_FORMAT_LONG;
 432                         if ((end - start) >= 2) {
 433                                 item->size = *start++;
 434                                 item->tag  = *start++;
 435                                 if ((end - start) >= item->size) {
 436                                         item->data.longdata = start;
 437                                         start += item->size;
 438                                         return item->size;
 439                                 }
 440                         }
 441                 } else {
 442                         item->format = HID_ITEM_FORMAT_SHORT;
 443                         item->size = b & 3;
 444                         switch (item->size) {
 445                                 case 0:
 446                                         return item->size;
 447                                 case 1:
 448                                         if ((end - start) >= 1) {
 449                                                 item->data.u8 = *start++;
 450                                                 return item->size;
 451                                         }
 452                                         break;
 453                                 case 2:
 454                                         if ((end - start) >= 2) {
 455                                                 item->data.u16 = swap_16((unsigned short *)start);
 456                                                 start+=2;
 457                                                 return item->size;
 458                                         }
 459                                 case 3:
 460                                         item->size++;
 461                                         if ((end - start) >= 4) {
 462                                                 item->data.u32 = swap_32((unsigned long *)start);
 463                                                 start+=4;
 464                                                 return item->size;
 465                                         }
 466                         }
 467                 }
 468         }
 469         return -1;
 470 }
 471
 472 /*
 473  * HID report descriptor item type (prefix bit 2,3)
 474  */
 475
 476 #define HID_ITEM_TYPE_MAIN              0
 477 #define HID_ITEM_TYPE_GLOBAL            1
 478 #define HID_ITEM_TYPE_LOCAL             2
 479 #define HID_ITEM_TYPE_RESERVED          3
 480 /*
 481  * HID report descriptor main item tags
 482  */
 483
 484 #define HID_MAIN_ITEM_TAG_INPUT                 8
 485 #define HID_MAIN_ITEM_TAG_OUTPUT                9
 486 #define HID_MAIN_ITEM_TAG_FEATURE               11
 487 #define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION      10
 488 #define HID_MAIN_ITEM_TAG_END_COLLECTION        12
 489 /*
 490  * HID report descriptor main item contents
 491  */
 492
 493 #define HID_MAIN_ITEM_CONSTANT          0x001
 494 #define HID_MAIN_ITEM_VARIABLE          0x002
 495 #define HID_MAIN_ITEM_RELATIVE          0x004
 496 #define HID_MAIN_ITEM_WRAP              0x008
 497 #define HID_MAIN_ITEM_NONLINEAR         0x010
 498 #define HID_MAIN_ITEM_NO_PREFERRED      0x020
 499 #define HID_MAIN_ITEM_NULL_STATE        0x040
 500 #define HID_MAIN_ITEM_VOLATILE          0x080
 501 #define HID_MAIN_ITEM_BUFFERED_BYTE     0x100
 502
 503 /*
 504  * HID report descriptor collection item types
 505  */
 506
 507 #define HID_COLLECTION_PHYSICAL         0
 508 #define HID_COLLECTION_APPLICATION      1
 509 #define HID_COLLECTION_LOGICAL          2
 510 /*
 511  * HID report descriptor global item tags
 512  */
 513
 514 #define HID_GLOBAL_ITEM_TAG_USAGE_PAGE          0
 515 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM     1
 516 #define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM     2
 517 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM    3
 518 #define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM    4
 519 #define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT       5
 520 #define HID_GLOBAL_ITEM_TAG_UNIT                6
 521 #define HID_GLOBAL_ITEM_TAG_REPORT_SIZE         7
 522 #define HID_GLOBAL_ITEM_TAG_REPORT_ID           8
 523 #define HID_GLOBAL_ITEM_TAG_REPORT_COUNT        9
 524 #define HID_GLOBAL_ITEM_TAG_PUSH                10
 525 #define HID_GLOBAL_ITEM_TAG_POP                 11
 526
 527 /*
 528  * HID report descriptor local item tags
 529  */
 530
 531 #define HID_LOCAL_ITEM_TAG_USAGE                0
 532 #define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM        1
 533 #define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM        2
 534 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX     3
 535 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM   4
 536 #define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM   5
 537 #define HID_LOCAL_ITEM_TAG_STRING_INDEX         7
 538 #define HID_LOCAL_ITEM_TAG_STRING_MINIMUM       8
 539 #define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM       9
 540 #define HID_LOCAL_ITEM_TAG_DELIMITER            10
 541
 542
 543 static void usb_kbd_show_item(struct hid_item *item)
 544 {
 545         switch(item->type) {
 546                 case HID_ITEM_TYPE_MAIN:
 547                         switch(item->tag) {
 548                                 case HID_MAIN_ITEM_TAG_INPUT:
 549                                         printf("Main Input");
 550                                         break;
 551                                 case HID_MAIN_ITEM_TAG_OUTPUT:
 552                                         printf("Main Output");
 553                                         break;
 554                                 case HID_MAIN_ITEM_TAG_FEATURE:
 555                                         printf("Main Feature");
 556                                         break;
 557                                 case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
 558                                         printf("Main Begin Collection");
 559                                         break;
 560                                 case HID_MAIN_ITEM_TAG_END_COLLECTION:
 561                                         printf("Main End Collection");
 562                                         break;
 563                                 default:
 564                                         printf("Main reserved %d",item->tag);
 565                                         break;
 566                         }
 567                         break;
 568                 case HID_ITEM_TYPE_GLOBAL:
 569                         switch(item->tag) {
 570                                 case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
 571                                         printf("- Global Usage Page");
 572                                         break;
 573                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
 574                                         printf("- Global Logical Minimum");
 575                                         break;
 576                                 case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
 577                                         printf("- Global Logical Maximum");
 578                                         break;
 579                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
 580                                         printf("- Global physical Minimum");
 581                                         break;
 582                                 case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
 583                                         printf("- Global physical Maximum");
 584                                         break;
 585                                 case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
 586                                         printf("- Global Unit Exponent");
 587                                         break;
 588                                 case HID_GLOBAL_ITEM_TAG_UNIT:
 589                                         printf("- Global Unit");
 590                                         break;
 591                                 case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
 592                                         printf("- Global Report Size");
 593                                         break;
 594                                 case HID_GLOBAL_ITEM_TAG_REPORT_ID:
 595                                         printf("- Global Report ID");
 596                                         break;
 597                                 case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
 598                                         printf("- Global Report Count");
 599                                         break;
 600                                 case HID_GLOBAL_ITEM_TAG_PUSH:
 601                                         printf("- Global Push");
 602                                         break;
 603                                 case HID_GLOBAL_ITEM_TAG_POP:
 604                                         printf("- Global Pop");
 605                                         break;
 606                                 default:
 607                                         printf("- Global reserved %d",item->tag);
 608                                         break;
 609                         }
 610                         break;
 611                 case HID_ITEM_TYPE_LOCAL:
 612                         switch(item->tag) {
 613                                 case HID_LOCAL_ITEM_TAG_USAGE:
 614                                         printf("-- Local Usage");
 615                                         break;
 616                                 case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
 617                                         printf("-- Local Usage Minimum");
 618                                         break;
 619                                 case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
 620                                         printf("-- Local Usage Maximum");
 621                                         break;
 622                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX:
 623                                         printf("-- Local Designator Index");
 624                                         break;
 625                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM:
 626                                         printf("-- Local Designator Minimum");
 627                                         break;
 628                                 case HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM:
 629                                         printf("-- Local Designator Maximum");
 630                                         break;
 631                                 case HID_LOCAL_ITEM_TAG_STRING_INDEX:
 632                                         printf("-- Local String Index");
 633                                         break;
 634                                 case HID_LOCAL_ITEM_TAG_STRING_MINIMUM:
 635                                         printf("-- Local String Minimum");
 636                                         break;
 637                                 case HID_LOCAL_ITEM_TAG_STRING_MAXIMUM:
 638                                         printf("-- Local String Maximum");
 639                                         break;
 640                                 case HID_LOCAL_ITEM_TAG_DELIMITER:
 641                                         printf("-- Local Delimiter");
 642                                         break;
 643                                 default:
 644                                         printf("-- Local reserved %d",item->tag);
 645                                         break;
 646                         }
 647                         break;
 648                 default:
 649                         printf("--- reserved %d",item->type);
 650                         break;
 651         }
 652         switch(item->size) {
 653                 case 1:
 654                         printf("  %d",item->data.u8);
 655                         break;
 656                 case 2:
 657                         printf("  %d",item->data.u16);
 658                         break;
 659                 case 4:
 660                         printf("  %ld",item->data.u32);
 661                         break;
 662         }
 663         printf("\n");
 664 }
 665
 666
 667 static int usb_kbd_get_hid_desc(struct usb_device *dev)
 668 {
 669         unsigned char buffer[256];
 670         struct usb_descriptor_header *head;
 671         struct usb_config_descriptor *config;
 672         int index,len,i;
 673         unsigned char *start, *end;
 674         struct hid_item item;
 675
 676         if(usb_get_configuration_no(dev,&buffer[0],0)==-1)
 677                 return -1;
 678         head =(struct usb_descriptor_header *)&buffer[0];
 679         if(head->bDescriptorType!=USB_DT_CONFIG) {
 680                 printf(" ERROR: NOT USB_CONFIG_DESC %x\n",head->bDescriptorType);
 681                 return -1;
 682         }
 683         index=head->bLength;
 684         config=(struct usb_config_descriptor *)&buffer[0];
 685         len=swap_16(config->wTotalLength);
 686         /* Ok the first entry must be a configuration entry, now process the others */
 687         head=(struct usb_descriptor_header *)&buffer[index];
 688         while(index+1 < len) {
 689                 if(head->bDescriptorType==USB_DT_HID) {
 690                         printf("HID desc found\n");
 691                         memcpy(&usb_kbd_hid_desc,&buffer[index],buffer[index]);
 692                         usb_kbd_hid_desc.bcdHID=swap_16(usb_kbd_hid_desc.bcdHID);
 693                         usb_kbd_hid_desc.wDescriptorLength=swap_16(usb_kbd_hid_desc.wDescriptorLength);
 694                         usb_kbd_display_hid(&usb_kbd_hid_desc);
 695                         len=0;
 696                         break;
 697                 }
 698                 index+=head->bLength;
 699                 head=(struct usb_descriptor_header *)&buffer[index];
 700         }
 701         if(len>0)
 702                 return -1;
 703         len=usb_kbd_hid_desc.wDescriptorLength;
 704         if((index = usb_get_class_descriptor(dev, 0, USB_DT_REPORT, 0, &buffer[0], len)) < 0) {
 705                 printf("reading report descriptor failed\n");
 706                 return -1;
 707         }
 708         printf(" report descriptor (size %u, read %d)\n", len, index);
 709         start=&buffer[0];
 710         end=&buffer[len];
 711         i=0;
 712         do {
 713                 index=fetch_item(start,end,&item);
 714                 i+=index;
 715                 i++;
 716                 if(index>=0)
 717                         usb_kbd_show_item(&item);
 718
 719                 start+=index;
 720                 start++;
 721         } while(index>=0);
 722
 723 }
 724
 725
 726 #endif
 727
 728 #endif /* CONFIG_USB_KEYBOARD */