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u-boot/common/usb_kbd.c
Tom Rix 8f8bd565f3 USB Consolidate descriptor definitions 
The header files usb.h and usbdescriptors.h have the same nameed
structure definitions for

usb_config_descriptor
usb_interface_descriptor
usb_endpoint_descriptor
usb_device_descriptor
usb_string_descriptor

These are out right duplicates in usb.h

usb_device_descriptor
usb_string_descriptor

This one has extra unused elements

usb_endpoint_descriptor

	unsigned char	bRefresh
	unsigned char	bSynchAddress;

These in usb.h have extra elements at the end of the usb 2.0
specified descriptor and are used.

usb_config_descriptor
usb_interface_descriptor

The change is to consolidate the definition of the descriptors
to usbdescriptors.h.  The dublicates in usb.h are removed.
The extra element structure will have their name shorted by
removing the '_descriptor' suffix.

So

usb_config_descriptor -> usb_config
usb_interface_descriptor -> usb_interface

For these, the common descriptor elements are accessed now
by an element 'desc'.

As an example

-	if (iface->bInterfaceClass != USB_CLASS_HUB)
+	if (iface->desc.bInterfaceClass != USB_CLASS_HUB)

This has been compile tested on MAKEALL arm, ppc and mips.

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
2009-12-20 12:47:37 +01:00

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/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland
*
* Part of this source has been derived from the Linux USB
* project.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <stdio_dev.h>
#include <asm/byteorder.h>
#include <usb.h>
#undef USB_KBD_DEBUG
/*
* if overwrite_console returns 1, the stdin, stderr and stdout
* are switched to the serial port, else the settings in the
* environment are used
*/
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console (void);
#else
int overwrite_console (void)
{
return (0);
}
#endif
#ifdef USB_KBD_DEBUG
#define USB_KBD_PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define USB_KBD_PRINTF(fmt,args...)
#endif
#define REPEAT_RATE 40/4 /* 40msec -> 25cps */
#define REPEAT_DELAY 10 /* 10 x REAPEAT_RATE = 400msec */
#define NUM_LOCK 0x53
#define CAPS_LOCK 0x39
#define SCROLL_LOCK 0x47
/* Modifier bits */
#define LEFT_CNTR 0
#define LEFT_SHIFT 1
#define LEFT_ALT 2
#define LEFT_GUI 3
#define RIGHT_CNTR 4
#define RIGHT_SHIFT 5
#define RIGHT_ALT 6
#define RIGHT_GUI 7
#define USB_KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */
static volatile char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
static volatile int usb_in_pointer = 0;
static volatile int usb_out_pointer = 0;
unsigned char new[8];
unsigned char old[8];
int repeat_delay;
#define DEVNAME "usbkbd"
static unsigned char num_lock = 0;
static unsigned char caps_lock = 0;
static unsigned char scroll_lock = 0;
static unsigned char ctrl = 0;
static unsigned char leds __attribute__ ((aligned (0x4)));
static unsigned char usb_kbd_numkey[] = {
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0','\r',0x1b,'\b','\t',' ', '-',
'=', '[', ']','\\', '#', ';', '\'', '`', ',', '.', '/'
};
static unsigned char usb_kbd_numkey_shifted[] = {
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')','\r',0x1b,'\b','\t',' ', '_',
'+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?'
};
/******************************************************************
* Queue handling
******************************************************************/
/* puts character in the queue and sets up the in and out pointer */
static void usb_kbd_put_queue(char data)
{
if((usb_in_pointer+1)==USB_KBD_BUFFER_LEN) {
if(usb_out_pointer==0) {
return; /* buffer full */
} else{
usb_in_pointer=0;
}
} else {
if((usb_in_pointer+1)==usb_out_pointer)
return; /* buffer full */
usb_in_pointer++;
}
usb_kbd_buffer[usb_in_pointer]=data;
return;
}
/* test if a character is in the queue */
static int usb_kbd_testc(void)
{
#ifdef CONFIG_SYS_USB_EVENT_POLL
usb_event_poll();
#endif
if(usb_in_pointer==usb_out_pointer)
return(0); /* no data */
else
return(1);
}
/* gets the character from the queue */
static int usb_kbd_getc(void)
{
char c;
while(usb_in_pointer==usb_out_pointer) {
#ifdef CONFIG_SYS_USB_EVENT_POLL
usb_event_poll();
#endif
}
if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
usb_out_pointer=0;
else
usb_out_pointer++;
c=usb_kbd_buffer[usb_out_pointer];
return (int)c;
}
/* forward decleration */
static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
/* search for keyboard and register it if found */
int drv_usb_kbd_init(void)
{
int error,i;
struct stdio_dev usb_kbd_dev,*old_dev;
struct usb_device *dev;
char *stdinname = getenv ("stdin");
usb_in_pointer=0;
usb_out_pointer=0;
/* scan all USB Devices */
for(i=0;i<USB_MAX_DEVICE;i++) {
dev=usb_get_dev_index(i); /* get device */
if(dev == NULL)
return -1;
if(dev->devnum!=-1) {
if(usb_kbd_probe(dev,0)==1) { /* Ok, we found a keyboard */
/* check, if it is already registered */
USB_KBD_PRINTF("USB KBD found set up device.\n");
old_dev = stdio_get_by_name(DEVNAME);
if(old_dev) {
/* ok, already registered, just return ok */
USB_KBD_PRINTF("USB KBD is already registered.\n");
return 1;
}
/* register the keyboard */
USB_KBD_PRINTF("USB KBD register.\n");
memset (&usb_kbd_dev, 0, sizeof(struct stdio_dev));
strcpy(usb_kbd_dev.name, DEVNAME);
usb_kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
usb_kbd_dev.putc = NULL;
usb_kbd_dev.puts = NULL;
usb_kbd_dev.getc = usb_kbd_getc;
usb_kbd_dev.tstc = usb_kbd_testc;
usb_kbd_dev.priv = (void *)dev;
error = stdio_register (&usb_kbd_dev);
if(error==0) {
/* check if this is the standard input device */
if(strcmp(stdinname,DEVNAME)==0) {
/* reassign the console */
if(overwrite_console()) {
return 1;
}
error=console_assign(stdin,DEVNAME);
if(error==0)
return 1;
else
return error;
}
return 1;
}
return error;
}
}
}
/* no USB Keyboard found */
return -1;
}
/* deregistering the keyboard */
int usb_kbd_deregister(void)
{
#ifdef CONFIG_SYS_STDIO_DEREGISTER
return stdio_deregister(DEVNAME);
#else
return 1;
#endif
}
/**************************************************************************
* Low Level drivers
*/
/* set the LEDs. Since this is used in the irq routine, the control job
is issued with a timeout of 0. This means, that the job is queued without
waiting for job completion */
static void usb_kbd_setled(struct usb_device *dev)
{
struct usb_interface *iface;
iface = &dev->config.if_desc[0];
leds=0;
if(scroll_lock!=0)
leds|=1;
leds<<=1;
if(caps_lock!=0)
leds|=1;
leds<<=1;
if(num_lock!=0)
leds|=1;
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
}
#define CAPITAL_MASK 0x20
/* Translate the scancode in ASCII */
static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int pressed)
{
unsigned char keycode;
if(pressed==0) {
/* key released */
repeat_delay=0;
return 0;
}
if(pressed==2) {
repeat_delay++;
if(repeat_delay<REPEAT_DELAY)
return 0;
repeat_delay=REPEAT_DELAY;
}
keycode=0;
if((scancode>3) && (scancode<=0x1d)) { /* alpha numeric values */
keycode=scancode-4 + 0x61;
if(caps_lock)
keycode&=~CAPITAL_MASK; /* switch to capital Letters */
if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) {
if(keycode & CAPITAL_MASK)
keycode&=~CAPITAL_MASK; /* switch to capital Letters */
else
keycode|=CAPITAL_MASK; /* switch to non capital Letters */
}
}
if((scancode>0x1d) && (scancode<0x3A)) {
if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) /* shifted */
keycode=usb_kbd_numkey_shifted[scancode-0x1e];
else /* non shifted */
keycode=usb_kbd_numkey[scancode-0x1e];
}
if (ctrl)
keycode = scancode - 0x3;
if(pressed==1) {
if(scancode==NUM_LOCK) {
num_lock=~num_lock;
return 1;
}
if(scancode==CAPS_LOCK) {
caps_lock=~caps_lock;
return 1;
}
if(scancode==SCROLL_LOCK) {
scroll_lock=~scroll_lock;
return 1;
}
}
if(keycode!=0) {
USB_KBD_PRINTF("%c",keycode);
usb_kbd_put_queue(keycode);
}
return 0;
}
/* Interrupt service routine */
static int usb_kbd_irq(struct usb_device *dev)
{
int i,res;
if((dev->irq_status!=0)||(dev->irq_act_len!=8))
{
USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
return 1;
}
res=0;
switch (new[0]) {
case 0x0: /* No combo key pressed */
ctrl = 0;
break;
case 0x01: /* Left Ctrl pressed */
case 0x10: /* Right Ctrl pressed */
ctrl = 1;
break;
}
for (i = 2; i < 8; i++) {
if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8]) {
res|=usb_kbd_translate(old[i],new[0],0);
}
if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8]) {
res|=usb_kbd_translate(new[i],new[0],1);
}
}
if((new[2]>3) && (old[2]==new[2])) /* still pressed */
res|=usb_kbd_translate(new[2],new[0],2);
if(res==1)
usb_kbd_setled(dev);
memcpy(&old[0],&new[0], 8);
return 1; /* install IRQ Handler again */
}
/* probes the USB device dev for keyboard type */
static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
{
struct usb_interface *iface;
struct usb_endpoint_descriptor *ep;
int pipe,maxp;
if (dev->descriptor.bNumConfigurations != 1) return 0;
iface = &dev->config.if_desc[ifnum];
if (iface->desc.bInterfaceClass != 3)
return 0;
if (iface->desc.bInterfaceSubClass != 1)
return 0;
if (iface->desc.bInterfaceProtocol != 1)
return 0;
if (iface->desc.bNumEndpoints != 1)
return 0;
ep = &iface->ep_desc[0];
if (!(ep->bEndpointAddress & 0x80)) return 0;
if ((ep->bmAttributes & 3) != 3) return 0;
USB_KBD_PRINTF("USB KBD found set protocol...\n");
/* ok, we found a USB Keyboard, install it */
/* usb_kbd_get_hid_desc(dev); */
usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
USB_KBD_PRINTF("USB KBD found set idle...\n");
usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
memset(&new[0], 0, 8);
memset(&old[0], 0, 8);
repeat_delay=0;
pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
maxp = usb_maxpacket(dev, pipe);
dev->irq_handle=usb_kbd_irq;
USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
usb_submit_int_msg(dev,pipe,&new[0], maxp > 8 ? 8 : maxp,ep->bInterval);
return 1;
}
#if 0
struct usb_hid_descriptor {
unsigned char bLength;
unsigned char bDescriptorType; /* 0x21 for HID */
unsigned short bcdHID; /* release number */
unsigned char bCountryCode;
unsigned char bNumDescriptors;
unsigned char bReportDescriptorType;
unsigned short wDescriptorLength;
} __attribute__ ((packed));
/*
* We parse each description item into this structure. Short items data
* values are expanded to 32-bit signed int, long items contain a pointer
* into the data area.
*/
struct hid_item {
unsigned char format;
unsigned char size;
unsigned char type;
unsigned char tag;
union {
unsigned char u8;
char s8;
unsigned short u16;
short s16;
unsigned long u32;
long s32;
unsigned char *longdata;
} data;
};
/*
* HID report item format
*/
#define HID_ITEM_FORMAT_SHORT 0
#define HID_ITEM_FORMAT_LONG 1
/*
* Special tag indicating long items
*/
#define HID_ITEM_TAG_LONG 15
static struct usb_hid_descriptor usb_kbd_hid_desc;
void usb_kbd_display_hid(struct usb_hid_descriptor *hid)
{
printf("USB_HID_DESC:\n");
printf(" bLenght 0x%x\n",hid->bLength);
printf(" bcdHID 0x%x\n",hid->bcdHID);
printf(" bCountryCode %d\n",hid->bCountryCode);
printf(" bNumDescriptors 0x%x\n",hid->bNumDescriptors);
printf(" bReportDescriptorType 0x%x\n",hid->bReportDescriptorType);
printf(" wDescriptorLength 0x%x\n",hid->wDescriptorLength);
}
/*
* Fetch a report description item from the data stream. We support long
* items, though they are not used yet.
*/
static int fetch_item(unsigned char *start,unsigned char *end, struct hid_item *item)
{
if((end - start) > 0) {
unsigned char b = *start++;
item->type = (b >> 2) & 3;
item->tag = (b >> 4) & 15;
if (item->tag == HID_ITEM_TAG_LONG) {
item->format = HID_ITEM_FORMAT_LONG;
if ((end - start) >= 2) {
item->size = *start++;
item->tag = *start++;
if ((end - start) >= item->size) {
item->data.longdata = start;
start += item->size;
return item->size;
}
}
} else {
item->format = HID_ITEM_FORMAT_SHORT;
item->size = b & 3;
switch (item->size) {
case 0:
return item->size;
case 1:
if ((end - start) >= 1) {
item->data.u8 = *start++;
return item->size;
}
break;
case 2:
if ((end - start) >= 2) {
item->data.u16 = le16_to_cpu((unsigned short *)start);
start+=2;
return item->size;
}
case 3:
item->size++;
if ((end - start) >= 4) {
item->data.u32 = le32_to_cpu((unsigned long *)start);
start+=4;
return item->size;
}
}
}
}
return -1;
}
/*
* HID report descriptor item type (prefix bit 2,3)
*/
#define HID_ITEM_TYPE_MAIN 0
#define HID_ITEM_TYPE_GLOBAL 1
#define HID_ITEM_TYPE_LOCAL 2
#define HID_ITEM_TYPE_RESERVED 3
/*
* HID report descriptor main item tags
*/
#define HID_MAIN_ITEM_TAG_INPUT 8
#define HID_MAIN_ITEM_TAG_OUTPUT 9
#define HID_MAIN_ITEM_TAG_FEATURE 11
#define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION 10
#define HID_MAIN_ITEM_TAG_END_COLLECTION 12
/*
* HID report descriptor main item contents
*/
#define HID_MAIN_ITEM_CONSTANT 0x001
#define HID_MAIN_ITEM_VARIABLE 0x002
#define HID_MAIN_ITEM_RELATIVE 0x004
#define HID_MAIN_ITEM_WRAP 0x008
#define HID_MAIN_ITEM_NONLINEAR 0x010
#define HID_MAIN_ITEM_NO_PREFERRED 0x020
#define HID_MAIN_ITEM_NULL_STATE 0x040
#define HID_MAIN_ITEM_VOLATILE 0x080
#define HID_MAIN_ITEM_BUFFERED_BYTE 0x100
/*
* HID report descriptor collection item types
*/
#define HID_COLLECTION_PHYSICAL 0
#define HID_COLLECTION_APPLICATION 1
#define HID_COLLECTION_LOGICAL 2
/*
* HID report descriptor global item tags
*/
#define HID_GLOBAL_ITEM_TAG_USAGE_PAGE 0
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM 1
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM 2
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM 3
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM 4
#define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT 5
#define HID_GLOBAL_ITEM_TAG_UNIT 6
#define HID_GLOBAL_ITEM_TAG_REPORT_SIZE 7
#define HID_GLOBAL_ITEM_TAG_REPORT_ID 8
#define HID_GLOBAL_ITEM_TAG_REPORT_COUNT 9
#define HID_GLOBAL_ITEM_TAG_PUSH 10
#define HID_GLOBAL_ITEM_TAG_POP 11
/*
* HID report descriptor local item tags
*/
#define HID_LOCAL_ITEM_TAG_USAGE 0
#define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM 1
#define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM 2
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX 3
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM 4
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM 5
#define HID_LOCAL_ITEM_TAG_STRING_INDEX 7
#define HID_LOCAL_ITEM_TAG_STRING_MINIMUM 8
#define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM 9
#define HID_LOCAL_ITEM_TAG_DELIMITER 10
static void usb_kbd_show_item(struct hid_item *item)
{
switch(item->type) {
case HID_ITEM_TYPE_MAIN:
switch(item->tag) {
case HID_MAIN_ITEM_TAG_INPUT:
printf("Main Input");
break;
case HID_MAIN_ITEM_TAG_OUTPUT:
printf("Main Output");
break;
case HID_MAIN_ITEM_TAG_FEATURE:
printf("Main Feature");
break;
case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
printf("Main Begin Collection");
break;
case HID_MAIN_ITEM_TAG_END_COLLECTION:
printf("Main End Collection");
break;
default:
printf("Main reserved %d",item->tag);
break;
}
break;
case HID_ITEM_TYPE_GLOBAL:
switch(item->tag) {
case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
printf("- Global Usage Page");
break;
case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
printf("- Global Logical Minimum");
break;
case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
printf("- Global Logical Maximum");
break;
case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
printf("- Global physical Minimum");
break;
case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
printf("- Global physical Maximum");
break;
case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
printf("- Global Unit Exponent");
break;
case HID_GLOBAL_ITEM_TAG_UNIT:
printf("- Global Unit");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
printf("- Global Report Size");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_ID:
printf("- Global Report ID");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
printf("- Global Report Count");
break;
case HID_GLOBAL_ITEM_TAG_PUSH:
printf("- Global Push");
break;
case HID_GLOBAL_ITEM_TAG_POP:
printf("- Global Pop");
break;
default:
printf("- Global reserved %d",item->tag);
break;
}
break;
case HID_ITEM_TYPE_LOCAL:
switch(item->tag) {
case HID_LOCAL_ITEM_TAG_USAGE:
printf("-- Local Usage");
break;
case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
printf("-- Local Usage Minimum");
break;
case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
printf("-- Local Usage Maximum");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX:
printf("-- Local Designator Index");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM:
printf("-- Local Designator Minimum");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM:
printf("-- Local Designator Maximum");
break;
case HID_LOCAL_ITEM_TAG_STRING_INDEX:
printf("-- Local String Index");
break;
case HID_LOCAL_ITEM_TAG_STRING_MINIMUM:
printf("-- Local String Minimum");
break;
case HID_LOCAL_ITEM_TAG_STRING_MAXIMUM:
printf("-- Local String Maximum");
break;
case HID_LOCAL_ITEM_TAG_DELIMITER:
printf("-- Local Delimiter");
break;
default:
printf("-- Local reserved %d",item->tag);
break;
}
break;
default:
printf("--- reserved %d",item->type);
break;
}
switch(item->size) {
case 1:
printf(" %d",item->data.u8);
break;
case 2:
printf(" %d",item->data.u16);
break;
case 4:
printf(" %ld",item->data.u32);
break;
}
printf("\n");
}
static int usb_kbd_get_hid_desc(struct usb_device *dev)
{
unsigned char buffer[256];
struct usb_descriptor_header *head;
struct usb_config_descriptor *config;
int index,len,i;
unsigned char *start, *end;
struct hid_item item;
if(usb_get_configuration_no(dev,&buffer[0],0)==-1)
return -1;
head =(struct usb_descriptor_header *)&buffer[0];
if(head->bDescriptorType!=USB_DT_CONFIG) {
printf(" ERROR: NOT USB_CONFIG_DESC %x\n",head->bDescriptorType);
return -1;
}
index=head->bLength;
config=(struct usb_config_descriptor *)&buffer[0];
len=le16_to_cpu(config->wTotalLength);
/* Ok the first entry must be a configuration entry, now process the others */
head=(struct usb_descriptor_header *)&buffer[index];
while(index+1 < len) {
if(head->bDescriptorType==USB_DT_HID) {
printf("HID desc found\n");
memcpy(&usb_kbd_hid_desc,&buffer[index],buffer[index]);
le16_to_cpus(&usb_kbd_hid_desc.bcdHID);
le16_to_cpus(&usb_kbd_hid_desc.wDescriptorLength);
usb_kbd_display_hid(&usb_kbd_hid_desc);
len=0;
break;
}
index+=head->bLength;
head=(struct usb_descriptor_header *)&buffer[index];
}
if(len>0)
return -1;
len=usb_kbd_hid_desc.wDescriptorLength;
if((index = usb_get_class_descriptor(dev, 0, USB_DT_REPORT, 0, &buffer[0], len)) < 0) {
printf("reading report descriptor failed\n");
return -1;
}
printf(" report descriptor (size %u, read %d)\n", len, index);
start = &buffer[0];
end = &buffer[len];
i=0;
do {
index=fetch_item(start,end,&item);
i+=index;
i++;
if(index>=0)
usb_kbd_show_item(&item);
start+=index;
start++;
} while(index>=0);
}
#endif
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