source: mainline/uspace/lib/usbhid/include/usb/hid/hidpath.h@ f3b39b4

/*
 * Copyright (c) 2011 Matej Klonfar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libusb
 * @{
 */
/** @file
 * USB HID report descriptor and report data parser
 */
#ifndef LIBUSB_HIDPATH_H_
#define LIBUSB_HIDPATH_H_

#include <usb/hid/hidparser.h>
#include <stdint.h>
#include <adt/list.h>


/*---------------------------------------------------------------------------*/
/*
 * Flags of usage paths comparison modes.
 *
 */
/** Wanted usage path must be exactly the same as the searched one.  This
 * option cannot be combined with the others. 
 */
#define USB_HID_PATH_COMPARE_STRICT             0

/**
 * Wanted usage path must be the suffix in the searched one.
 */
#define USB_HID_PATH_COMPARE_END                1

/** 
 * Only usage page are compared along the usage path.  This option can be
 * combined with others. 
 */
#define USB_HID_PATH_COMPARE_USAGE_PAGE_ONLY    2

/** 
 * Searched usage page must be prefix of the other one.
 */
#define USB_HID_PATH_COMPARE_BEGIN              4

/** 
 * Searched couple of usage page and usage can be anywhere in usage path.
 * This option is deprecated.
 */
#define USB_HID_PATH_COMPARE_ANYWHERE           8

/*----------------------------------------------------------------------------*/
/** 
 * Item of usage path structure. Last item of linked list describes one item
 * in report, the others describe superior Collection tags. Usage and Usage
 * page of report item can be changed due to data in report. 
 */
typedef struct {
        /** Usage page of report item. Zero when usage page can be changed. */
        uint32_t usage_page;
        /** Usage of report item. Zero when usage can be changed. */    
        uint32_t usage;

        /** Attribute of Collection tag in report descriptor*/
        uint8_t flags;

        /** Linked list structure*/
        link_t link;
} usb_hid_report_usage_path_t;


/*---------------------------------------------------------------------------*/
/** 
 * USB HID usage path structure.
 * */
typedef struct {
        /** Length of usage path */     
        int depth;      

        /** Report id. Zero is reserved and means that report id is not used.
         * */
        uint8_t report_id;
        
        /** Linked list structure. */   
        link_t link; /* list */

        /** Head of the list of usage path items. */
        link_t head;

} usb_hid_report_path_t;

/*---------------------------------------------------------------------------*/
usb_hid_report_path_t *usb_hid_report_path(void);

void usb_hid_report_path_free(usb_hid_report_path_t *path);

int usb_hid_report_path_set_report_id(usb_hid_report_path_t *usage_path,
                uint8_t report_id);

int usb_hid_report_path_append_item(usb_hid_report_path_t *usage_path, 
                int32_t usage_page, int32_t usage);

void usb_hid_report_remove_last_item(usb_hid_report_path_t *usage_path);

void usb_hid_report_null_last_item(usb_hid_report_path_t *usage_path);

void usb_hid_report_set_last_item(usb_hid_report_path_t *usage_path, 
                int32_t tag, int32_t data);

int usb_hid_report_compare_usage_path(usb_hid_report_path_t *report_path,
                usb_hid_report_path_t *path, int flags);

usb_hid_report_path_t *usb_hid_report_path_clone(
                usb_hid_report_path_t *usage_path);

void usb_hid_print_usage_path(usb_hid_report_path_t *path);

#endif
/**
 * @}
 */