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