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
39 namespace sdm {
40
gcd(float a,float b)41 float 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
lcm(float a,float b)55 float lcm(float a, float b) {
56 return (a * b) / gcd(a, b);
57 }
58
CloseFd(int * fd)59 void CloseFd(int *fd) {
60 if (*fd >= 0) {
61 Sys::close_(*fd);
62 *fd = -1;
63 }
64 }
65
GetDriverType()66 DriverType 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