1/*
2* Copyright (c) 2016 - 2017, The Linux Foundation. All rights reserved.
3*
4* Redistribution and use in source and binary forms, with or without
5* modification, are permitted provided that the following conditions are
6* met:
7*   * Redistributions of source code must retain the above copyright
8*     notice, this list of conditions and the following disclaimer.
9*   * Redistributions in binary form must reproduce the above
10*     copyright notice, this list of conditions and the following
11*     disclaimer in the documentation and/or other materials provided
12*     with the distribution.
13*   * Neither the name of The Linux Foundation nor the names of its
14*     contributors may be used to endorse or promote products derived
15*     from this software without specific prior written permission.
16*
17* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28*/
29
30#include <unistd.h>
31#include <math.h>
32#include <utils/sys.h>
33#include <utils/utils.h>
34
35#include <algorithm>
36
37#define __CLASS__ "Utils"
38
39namespace sdm {
40
41float gcd(float a, float b) {
42  if (a < b) {
43    std::swap(a, b);
44  }
45
46  while (b != 0) {
47    float tmp = b;
48    b = fmodf(a, b);
49    a = tmp;
50  }
51
52  return a;
53}
54
55float lcm(float a, float b) {
56  return (a * b) / gcd(a, b);
57}
58
59void CloseFd(int *fd) {
60  if (*fd >= 0) {
61    Sys::close_(*fd);
62    *fd = -1;
63  }
64}
65
66DriverType GetDriverType() {
67    const char *fb_caps = "/sys/devices/virtual/graphics/fb0/mdp/caps";
68    // 0 - File exists
69    return Sys::access_(fb_caps, F_OK) ? DriverType::DRM : DriverType::FB;
70}
71}  // namespace sdm
72