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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 
     32 
     33 #define MAX_FRAME_BUFFER_NAME_SIZE      (80)
     34 #define QD_UTILS_DEBUG 0
     35 
     36 int getHDMINode(void)
     37 {
     38     FILE *displayDeviceFP = NULL;
     39     char fbType[MAX_FRAME_BUFFER_NAME_SIZE];
     40     char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
     41     int j = 0;
     42 
     43     for(j = 0; j < HWC_NUM_DISPLAY_TYPES; j++) {
     44         snprintf (msmFbTypePath, sizeof(msmFbTypePath),
     45                   "/sys/class/graphics/fb%d/msm_fb_type", j);
     46         displayDeviceFP = fopen(msmFbTypePath, "r");
     47         if(displayDeviceFP) {
     48             fread(fbType, sizeof(char), MAX_FRAME_BUFFER_NAME_SIZE,
     49                     displayDeviceFP);
     50             if(strncmp(fbType, "dtv panel", strlen("dtv panel")) == 0) {
     51                 ALOGD("%s: HDMI is at fb%d", __func__, j);
     52                 fclose(displayDeviceFP);
     53                 break;
     54             }
     55             fclose(displayDeviceFP);
     56         } else {
     57             ALOGE("%s: Failed to open fb node %d", __func__, j);
     58         }
     59     }
     60 
     61     if (j < HWC_NUM_DISPLAY_TYPES)
     62         return j;
     63     else
     64         ALOGE("%s: Failed to find HDMI node", __func__);
     65 
     66     return -1;
     67 }
     68 
     69 int getEdidRawData(char *buffer)
     70 {
     71     int size;
     72     int edidFile;
     73     char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
     74     int node_id = getHDMINode();
     75 
     76     if (node_id < 0) {
     77         ALOGE("%s no HDMI node found", __func__);
     78         return 0;
     79     }
     80 
     81     snprintf(msmFbTypePath, sizeof(msmFbTypePath),
     82                  "/sys/class/graphics/fb%d/edid_raw_data", node_id);
     83 
     84    edidFile = open(msmFbTypePath, O_RDONLY, 0);
     85 
     86     if (edidFile < 0) {
     87         ALOGE("%s no edid raw data found", __func__);
     88         return 0;
     89     }
     90 
     91     size = (int)read(edidFile, (char*)buffer, EDID_RAW_DATA_SIZE);
     92     close(edidFile);
     93     return size;
     94 }
     95 
     96 /* Calculates the aspect ratio for based on src & dest */
     97 void getAspectRatioPosition(int destWidth, int destHeight, int srcWidth,
     98                                 int srcHeight, hwc_rect_t& rect) {
     99    int x =0, y =0;
    100 
    101    if (srcWidth * destHeight > destWidth * srcHeight) {
    102         srcHeight = destWidth * srcHeight / srcWidth;
    103         srcWidth = destWidth;
    104     } else if (srcWidth * destHeight < destWidth * srcHeight) {
    105         srcWidth = destHeight * srcWidth / srcHeight;
    106         srcHeight = destHeight;
    107     } else {
    108         srcWidth = destWidth;
    109         srcHeight = destHeight;
    110     }
    111     if (srcWidth > destWidth) srcWidth = destWidth;
    112     if (srcHeight > destHeight) srcHeight = destHeight;
    113     x = (destWidth - srcWidth) / 2;
    114     y = (destHeight - srcHeight) / 2;
    115     ALOGD_IF(QD_UTILS_DEBUG, "%s: AS Position: x = %d, y = %d w = %d h = %d",
    116              __FUNCTION__, x, y, srcWidth , srcHeight);
    117     // Convert it back to hwc_rect_t
    118     rect.left = x;
    119     rect.top = y;
    120     rect.right = srcWidth + rect.left;
    121     rect.bottom = srcHeight + rect.top;
    122 }
    123 
    124