1/** @addtogroup MCD_MCDIMPL_DAEMON_KERNEL
2 * @{
3 * @file
4 *
5 * Kernel Module Interface.
6 *
7 * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote
18 *    products derived from this software without specific prior
19 *    written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33#include <cstdlib>
34
35#include <fcntl.h>
36#include <sys/mman.h>
37#include <errno.h>
38
39#include "CKMod.h"
40
41#include "log.h"
42
43#define INVALID_FILE_DESCRIPTOR          ((int)(-1))
44
45//------------------------------------------------------------------------------
46CKMod::CKMod(void)
47{
48    fdKMod = INVALID_FILE_DESCRIPTOR;
49}
50
51
52//------------------------------------------------------------------------------
53CKMod::~CKMod(void)
54{
55    close();
56}
57
58
59//------------------------------------------------------------------------------
60bool CKMod::isOpen(void)
61{
62    return (INVALID_FILE_DESCRIPTOR == fdKMod) ? false : true;
63}
64
65
66//------------------------------------------------------------------------------
67mcResult_t CKMod::open(const char *deviceName)
68{
69    if (isOpen()) {
70        LOG_W("already open");
71        return MC_DRV_ERR_DEVICE_ALREADY_OPEN;
72    }
73
74    LOG_I(" Opening kernel module at %s.", deviceName);
75
76    // open return -1 on error, "errno" is set with details
77    int openRet = ::open(deviceName, O_RDWR);
78    if (openRet == -1) {
79        LOG_ERRNO("open");
80        return MAKE_MC_DRV_KMOD_WITH_ERRNO(errno);
81    }
82
83    fdKMod = openRet;
84    return MC_DRV_OK;
85}
86
87
88//------------------------------------------------------------------------------
89void CKMod::close(
90    void
91)
92{
93    if (isOpen()) {
94        if (::close(fdKMod) != 0) {
95            LOG_ERRNO("close");
96        } else {
97            fdKMod = INVALID_FILE_DESCRIPTOR;
98        }
99    } else {
100        LOG_W(" Kernel module device not open");
101    }
102}
103
104/** @} */
105