hwc: Add secure display attribute

- External displays can be secure or non-secure based on HDCP
- Propogate this to the SF with the getDisplayConfig
- Non-virtual displays(pri and hdmi) are considered to be secure
- For WFD using V4L2 archiecture, read the HDCP status from the
  sysfs and update accordingly

Change-Id: I4aaf303f0770201b8ca4f8a1c578bed61054bcfb

libhwcomposer/hwc.cpp

@@ -799,6 +799,7 @@ int hwc_getDisplayAttributes(struct hwc_composer_device_1* dev, int disp,
         HWC_DISPLAY_HEIGHT,
         HWC_DISPLAY_DPI_X,
         HWC_DISPLAY_DPI_Y,
+        HWC_DISPLAY_SECURE,
         HWC_DISPLAY_NO_ATTRIBUTE,
     };
 
@@ -844,6 +845,9 @@ int hwc_getDisplayAttributes(struct hwc_composer_device_1* dev, int disp,
         case HWC_DISPLAY_DPI_Y:
             values[i] = (int32_t) (ctx->dpyAttr[disp].ydpi*1000.0);
             break;
+        case HWC_DISPLAY_SECURE:
+            values[i] = (int32_t) (ctx->dpyAttr[disp].secure);
+            break;
         default:
             ALOGE("Unknown display attribute %d",
                     attributes[i]);

libhwcomposer/hwc_utils.cpp

@@ -128,6 +128,10 @@ void updateDisplayInfo(hwc_context_t* ctx, int dpy) {
     ctx->dpyAttr[dpy].yres = ctx->mHDMIDisplay->getHeight();
     ctx->dpyAttr[dpy].mMDPScalingMode = ctx->mHDMIDisplay->getMDPScalingMode();
     ctx->dpyAttr[dpy].vsync_period = ctx->mHDMIDisplay->getVsyncPeriod();
+    //FIXME: for now assume HDMI as secure
+    //Will need to read the HDCP status from the driver
+    //and update this accordingly
+    ctx->dpyAttr[dpy].secure = true;
     ctx->mViewFrame[dpy].left = 0;
     ctx->mViewFrame[dpy].top = 0;
     ctx->mViewFrame[dpy].right = ctx->dpyAttr[dpy].xres;
@@ -224,6 +228,7 @@ static int openFramebufferDevice(hwc_context_t *ctx)
     ctx->dpyAttr[HWC_DISPLAY_PRIMARY].ydpi = ydpi;
     ctx->dpyAttr[HWC_DISPLAY_PRIMARY].refreshRate = (uint32_t)fps;
     ctx->dpyAttr[HWC_DISPLAY_PRIMARY].dynRefreshRate = (uint32_t)fps;
+    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].secure = true;
     ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period =
             (uint32_t)(1000000000l / fps);
 

libhwcomposer/hwc_utils.h

@@ -89,6 +89,7 @@ struct DisplayAttributes {
     uint32_t stride;
     float xdpi;
     float ydpi;
+    bool secure;
     int fd;
     bool connected; //Applies only to pluggable disp.
     //Connected does not mean it ready to use.