usb_kbd.c

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	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 = swap_16((unsigned short *)start);
						start+=2;
						return item->size;
					}
				case 3:
					item->size++;
					if ((end - start) >= 4) {
						item->data.u32 = swap_32((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=swap_16(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]);
			usb_kbd_hid_desc.bcdHID=swap_16(usb_kbd_hid_desc.bcdHID);
			usb_kbd_hid_desc.wDescriptorLength=swap_16(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

#endif /* CONFIG_USB_KEYBOARD */