libqdutils: add edid raw data reading support
Add API getEdidRawData to fill the input buffer with
edid raw data(640 bytes)
Change-Id: I993c3fdc01b469f65d78d8f5d05c46c54d4e580d
diff --git a/libqdutils/qd_utils.cpp b/libqdutils/qd_utils.cpp
new file mode 100644
index 0000000..5a457d0
--- /dev/null
+++ b/libqdutils/qd_utils.cpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "qd_utils.h"
+
+
+#define MAX_FRAME_BUFFER_NAME_SIZE (80)
+#define MAX_DISPLAY_DEVICES (3)
+
+int getHDMINode(void)
+{
+ FILE *displayDeviceFP = NULL;
+ char fbType[MAX_FRAME_BUFFER_NAME_SIZE];
+ char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
+ int j = 0;
+
+ for(j = 0; j < MAX_DISPLAY_DEVICES; j++) {
+ snprintf (msmFbTypePath, sizeof(msmFbTypePath),
+ "/sys/class/graphics/fb%d/msm_fb_type", j);
+ displayDeviceFP = fopen(msmFbTypePath, "r");
+ if(displayDeviceFP) {
+ fread(fbType, sizeof(char), MAX_FRAME_BUFFER_NAME_SIZE,
+ displayDeviceFP);
+ if(strncmp(fbType, "dtv panel", strlen("dtv panel")) == 0) {
+ ALOGD("%s: HDMI is at fb%d", __func__, j);
+ fclose(displayDeviceFP);
+ break;
+ }
+ fclose(displayDeviceFP);
+ } else {
+ ALOGE("%s: Failed to open fb node %d", __func__, j);
+ }
+ }
+
+ if (j < MAX_DISPLAY_DEVICES)
+ return j;
+ else
+ ALOGE("%s: Failed to find HDMI node", __func__);
+
+ return -1;
+}
+
+int getEdidRawData(char *buffer)
+{
+ int size;
+ int edidFile;
+ char msmFbTypePath[MAX_FRAME_BUFFER_NAME_SIZE];
+ int node_id = getHDMINode();
+
+ if (node_id < 0) {
+ ALOGE("%s no HDMI node found", __func__);
+ return 0;
+ }
+
+ snprintf(msmFbTypePath, sizeof(msmFbTypePath),
+ "/sys/class/graphics/fb%d/edid_raw_data", node_id);
+
+ edidFile = open(msmFbTypePath, O_RDONLY, 0);
+
+ if (edidFile < 0) {
+ ALOGE("%s no edid raw data found", __func__);
+ return 0;
+ }
+
+ size = read(edidFile, (char*)buffer, EDID_RAW_DATA_SIZE);
+ close(edidFile);
+ return size;
+}
+