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      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 #define QD_UTILS_DEBUG 0
     32 
     33 namespace qdutils {
     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             ALOGD("%s: fb node %d not present", __func__, j);
     57         }
     58     }
     59 
     60     if (j < HWC_NUM_DISPLAY_TYPES)
     61         return j;
     62     else
     63         ALOGI("%s: No HDMI node on this device", __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 /* Calculates the aspect ratio for based on src & dest */
     96 void getAspectRatioPosition(int destWidth, int destHeight, int srcWidth,
     97                                 int srcHeight, hwc_rect_t& rect) {
     98    int x =0, y =0;
     99 
    100    if (srcWidth * destHeight > destWidth * srcHeight) {
    101         srcHeight = destWidth * srcHeight / srcWidth;
    102         srcWidth = destWidth;
    103     } else if (srcWidth * destHeight < destWidth * srcHeight) {
    104         srcWidth = destHeight * srcWidth / srcHeight;
    105         srcHeight = destHeight;
    106     } else {
    107         srcWidth = destWidth;
    108         srcHeight = destHeight;
    109     }
    110     if (srcWidth > destWidth) srcWidth = destWidth;
    111     if (srcHeight > destHeight) srcHeight = destHeight;
    112     x = (destWidth - srcWidth) / 2;
    113     y = (destHeight - srcHeight) / 2;
    114     ALOGD_IF(QD_UTILS_DEBUG, "%s: AS Position: x = %d, y = %d w = %d h = %d",
    115              __FUNCTION__, x, y, srcWidth , srcHeight);
    116     // Convert it back to hwc_rect_t
    117     rect.left = x;
    118     rect.top = y;
    119     rect.right = srcWidth + rect.left;
    120     rect.bottom = srcHeight + rect.top;
    121 }
    122 
    123 }; //namespace qdutils
    124