src/add-ons/accelerants/3dfx/3dfx_dpms.cpp

   1 /*
   2         Copyright 2010 Haiku, Inc.  All rights reserved.
   3         Distributed under the terms of the MIT license.
   4
   5         Authors:
   6         Gerald Zajac 2010
   7 */
   8
   9
  10 #include "accelerant.h"
  11 #include "3dfx.h"
  12
  13
  14
  15 #define H_SYNC_OFF      BIT(3)
  16 #define V_SYNC_OFF      BIT(1)
  17
  18
  19 uint32
  20 TDFX_DPMSCapabilities(void)
  21 {
  22         // Return DPMS modes supported by this device.
  23
  24         return B_DPMS_ON | B_DPMS_STAND_BY | B_DPMS_SUSPEND | B_DPMS_OFF;
  25 }
  26
  27
  28 uint32
  29 TDFX_GetDPMSMode(void)
  30 {
  31         // Return the current DPMS mode.
  32
  33         uint32 tmp = INREG32(DAC_MODE) & (H_SYNC_OFF | V_SYNC_OFF);
  34         uint32 mode;
  35
  36         if (tmp == 0 )
  37                 mode = B_DPMS_ON;
  38         else if (tmp == H_SYNC_OFF)
  39                 mode = B_DPMS_STAND_BY;
  40         else if (tmp == V_SYNC_OFF)
  41                 mode = B_DPMS_SUSPEND;
  42         else
  43                 mode = B_DPMS_OFF;
  44
  45         TRACE("TDFX_DPMSMode() mode: %d\n", mode);
  46         return mode;
  47 }
  48
  49
  50 status_t
  51 TDFX_SetDPMSMode(uint32 dpmsMode)
  52 {
  53         // Set the display into one of the Display Power Management modes,
  54         // and return B_OK if successful, else return B_ERROR.
  55
  56         TRACE("TDFX_SetDPMSMode() mode: %d\n", dpmsMode);
  57
  58         uint32 dacMode = INREG32(DAC_MODE) & ~(H_SYNC_OFF | V_SYNC_OFF);
  59
  60         switch (dpmsMode) {
  61                 case B_DPMS_ON:
  62                         // Screen: On; HSync: On, VSync: On.
  63                         break;
  64
  65                 case B_DPMS_STAND_BY:
  66                         // Screen: Off; HSync: Off, VSync: On.
  67                         dacMode |= H_SYNC_OFF;
  68                         break;
  69
  70                 case B_DPMS_SUSPEND:
  71                         // Screen: Off; HSync: On, VSync: Off.
  72                         dacMode |= V_SYNC_OFF;
  73                         break;
  74
  75                 case B_DPMS_OFF:
  76                         // Screen: Off; HSync: Off, VSync: Off.
  77                         dacMode |= H_SYNC_OFF | V_SYNC_OFF;
  78                         break;
  79
  80                 default:
  81                         TRACE("Invalid DPMS mode %d\n", dpmsMode);
  82                         return B_ERROR;
  83         }
  84
  85         OUTREG32(DAC_MODE, dacMode);
  86         return B_OK;
  87 }