1 /* 2 * Copyright (c) 2013, 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 "qd_utils.h" 31 32 33 #define MAX_FRAME_BUFFER_NAME_SIZE (80) 34 35 int getHDMINode(void) 36 { 37 FILE *displayDeviceFP = NULL; 38 char fbType[MAX_FRAME_BUFFER_NAME_SIZE]; 39 char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE]; 40 int j = 0; 41 42 for(j = 0; j < HWC_NUM_DISPLAY_TYPES; j++) { 43 snprintf (msmFbTypePath, sizeof(msmFbTypePath), 44 "/sys/class/graphics/fb%d/msm_fb_type", j); 45 displayDeviceFP = fopen(msmFbTypePath, "r"); 46 if(displayDeviceFP) { 47 fread(fbType, sizeof(char), MAX_FRAME_BUFFER_NAME_SIZE, 48 displayDeviceFP); 49 if(strncmp(fbType, "dtv panel", strlen("dtv panel")) == 0) { 50 ALOGD("%s: HDMI is at fb%d", __func__, j); 51 fclose(displayDeviceFP); 52 break; 53 } 54 fclose(displayDeviceFP); 55 } else { 56 ALOGE("%s: Failed to open fb node %d", __func__, j); 57 } 58 } 59 60 if (j < HWC_NUM_DISPLAY_TYPES) 61 return j; 62 else 63 ALOGE("%s: Failed to find HDMI node", __func__); 64 65 return -1; 66 } 67 68 int getEdidRawData(char *buffer) 69 { 70 int size; 71 int edidFile; 72 char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE]; 73 int node_id = getHDMINode(); 74 75 if (node_id < 0) { 76 ALOGE("%s no HDMI node found", __func__); 77 return 0; 78 } 79 80 snprintf(msmFbTypePath, sizeof(msmFbTypePath), 81 "/sys/class/graphics/fb%d/edid_raw_data", node_id); 82 83 edidFile = open(msmFbTypePath, O_RDONLY, 0); 84 85 if (edidFile < 0) { 86 ALOGE("%s no edid raw data found", __func__); 87 return 0; 88 } 89 90 size = (int)read(edidFile, (char*)buffer, EDID_RAW_DATA_SIZE); 91 close(edidFile); 92 return size; 93 } 94 95
