xref: /openbmc/u-boot/common/usb_kbd.c (revision 7d9b5bae)
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 CFG_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 CFG_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 CFG_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
748