src/add-ons/accelerants/s3/virge_dpms.cpp

   1 /*
   2         Haiku S3 Virge driver adapted from the X.org Virge driver.
   3
   4         Copyright (C) 1994-1999 The XFree86 Project, Inc.  All Rights Reserved.
   5
   6         Copyright 2007-2008 Haiku, Inc.  All rights reserved.
   7         Distributed under the terms of the MIT license.
   8
   9         Authors:
  10         Gerald Zajac 2007-2008
  11 */
  12
  13
  14 #include "accel.h"
  15 #include "virge.h"
  16
  17
  18
  19 uint32
  20 Virge_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 Virge_GetDPMSMode(void)
  30 {
  31         // Return the current DPMS mode.
  32
  33         // Note:  I do not know whether the following code is correctly reading
  34         // the current DPMS mode.  I'm assuming that reading back the bits that
  35         // were set by function Virge_SetDPMSMode will give the current DPMS mode.
  36
  37         uint32 mode = B_DPMS_ON;
  38
  39         switch (ReadSeqReg(0x0d) & 0x70) {
  40                 case 0:
  41                         mode = B_DPMS_ON;
  42                         break;
  43                 case 0x10:
  44                         mode = B_DPMS_STAND_BY;
  45                         break;
  46                 case 0x40:
  47                         mode = B_DPMS_SUSPEND;
  48                         break;
  49                 case 0x50:
  50                         mode = B_DPMS_OFF;
  51                         break;
  52                 default:
  53                         TRACE("Unknown DPMS mode, reg sr0D: 0x%X\n", ReadSeqReg(0x0d));
  54         }
  55
  56         TRACE("Virge_GetDPMSMode() mode: %d\n", mode);
  57         return mode;
  58 }
  59
  60
  61 status_t
  62 Virge_SetDPMSMode(uint32 dpmsMode)
  63 {
  64         // Set the display into one of the Display Power Management modes,
  65         // and return B_OK if successful, else return B_ERROR.
  66
  67         TRACE("Virge_SetDPMSMode() mode: %d\n", dpmsMode);
  68
  69         WriteSeqReg(0x08, 0x06);                // unlock extended sequencer regs
  70
  71         uint8 sr0D = ReadSeqReg(0x0d) & 0x03;
  72
  73         switch (dpmsMode) {
  74                 case B_DPMS_ON:
  75                         break;
  76                 case B_DPMS_STAND_BY:
  77                         sr0D |= 0x10;
  78                         break;
  79                 case B_DPMS_SUSPEND:
  80                         sr0D |= 0x40;
  81                         break;
  82                 case B_DPMS_OFF:
  83                         sr0D |= 0x50;
  84                         break;
  85                 default:
  86                         TRACE("Invalid DPMS mode %d\n", dpmsMode);
  87                         return B_ERROR;
  88         }
  89
  90         WriteSeqReg(0x0d, sr0D);
  91
  92         return B_OK;
  93 }