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      1 /*
      2 // Copyright(c)2014 IntelCorporation
      3 //
      4 // LicensedundertheApacheLicense,Version2.0(the"License");
      5 // youmaynotusethisfileexceptincompliancewiththeLicense.
      6 // YoumayobtainacopyoftheLicenseat
      7 //
      8 // http://www.apache.org/licenses/LICENSE-2.0
      9 //
     10 // Unlessrequiredbyapplicablelaworagreedtoinwriting,software
     11 // distributedundertheLicenseisdistributedonan"ASIS"BASIS,
     12 // WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.
     13 // SeetheLicenseforthespecificlanguagegoverningpermissionsand
     14 // limitationsundertheLicense.
     15 */
     16 
     17 #include <HwcTrace.h>
     18 #include <linux/psb_drm.h>
     19 #include <Hwcomposer.h>
     20 #include <common/DrmControl.h>
     21 
     22 namespace android {
     23 namespace intel {
     24 
     25 DrmControl::DrmControl()
     26     : mVideoExtCommand(0)
     27 {
     28 }
     29 
     30 DrmControl::~DrmControl()
     31 {
     32 }
     33 
     34 int DrmControl::getVideoExtCommand()
     35 {
     36     if (mVideoExtCommand) {
     37         return mVideoExtCommand;
     38     }
     39 
     40     int fd = Hwcomposer::getInstance().getDrm()->getDrmFd();
     41 
     42     union drm_psb_extension_arg video_getparam_arg;
     43     strncpy(video_getparam_arg.extension,
     44             "lnc_video_getparam", sizeof(video_getparam_arg.extension));
     45     int ret = drmCommandWriteRead(fd, DRM_PSB_EXTENSION,
     46             &video_getparam_arg, sizeof(video_getparam_arg));
     47     if (ret != 0) {
     48         VTRACE("failed to get video extension command");
     49         return 0;
     50     }
     51 
     52     mVideoExtCommand = video_getparam_arg.rep.driver_ioctl_offset;
     53 
     54     return mVideoExtCommand;
     55 }
     56 
     57 } // namespace intel
     58 } // namespace android
     59