src/add-ons/accelerants/intel_810/i810_dpms.cpp

   1 /*
   2  * Copyright 2012 Haiku, Inc.  All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  *
   5  * Authors:
   6  *              Gerald Zajac
   7  */
   8
   9 /*!
  10         Haiku Intel-810 video driver was adapted from the X.org intel driver which
  11         has the following copyright.
  12
  13         Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  14         All Rights Reserved.
  15  */
  16
  17
  18 #include "accelerant.h"
  19 #include "i810_regs.h"
  20
  21
  22 #define DPMS_SYNC_SELECT        0x5002
  23 #define H_SYNC_OFF                      0x02
  24 #define V_SYNC_OFF                      0x08
  25
  26
  27 uint32
  28 I810_DPMSCapabilities(void)
  29 {
  30         // Return DPMS modes supported by this device.
  31
  32         return B_DPMS_ON | B_DPMS_STAND_BY | B_DPMS_SUSPEND | B_DPMS_OFF;
  33 }
  34
  35
  36 uint32
  37 I810_GetDPMSMode(void)
  38 {
  39         // Return the current DPMS mode.
  40
  41         uint32 tmp = INREG8(DPMS_SYNC_SELECT) & (H_SYNC_OFF | V_SYNC_OFF);
  42         uint32 mode;
  43
  44         if (tmp == 0 )
  45                 mode = B_DPMS_ON;
  46         else if (tmp == H_SYNC_OFF)
  47                 mode = B_DPMS_STAND_BY;
  48         else if (tmp == V_SYNC_OFF)
  49                 mode = B_DPMS_SUSPEND;
  50         else
  51                 mode = B_DPMS_OFF;
  52
  53         TRACE("I810_DPMSMode() mode: %d\n", mode);
  54         return mode;
  55 }
  56
  57
  58 status_t
  59 I810_SetDPMSMode(uint32 dpmsMode)
  60 {
  61         // Set the display into one of the Display Power Management modes,
  62         // and return B_OK if successful, else return B_ERROR.
  63
  64         TRACE("I810_SetDPMSMode() mode: %d\n", dpmsMode);
  65
  66         uint8 seq01 = ReadSeqReg(1) & ~0x20;
  67         uint8 dpmsSyncSelect = 0;
  68
  69         switch (dpmsMode) {
  70                 case B_DPMS_ON:
  71                         // Screen: On; HSync: On, VSync: On.
  72                         break;
  73
  74                 case B_DPMS_STAND_BY:
  75                         // Screen: Off; HSync: Off, VSync: On.
  76                         seq01 |= 0x20;
  77                         dpmsSyncSelect = H_SYNC_OFF;
  78                         break;
  79
  80                 case B_DPMS_SUSPEND:
  81                         // Screen: Off; HSync: On, VSync: Off.
  82                         seq01 |= 0x20;
  83                         dpmsSyncSelect = V_SYNC_OFF;
  84                         break;
  85
  86                 case B_DPMS_OFF:
  87                         // Screen: Off; HSync: Off, VSync: Off.
  88                         seq01 |= 0x20;
  89                         dpmsSyncSelect = H_SYNC_OFF | V_SYNC_OFF;
  90                         break;
  91
  92                 default:
  93                         TRACE("Invalid DPMS mode %d\n", dpmsMode);
  94                         return B_ERROR;
  95         }
  96
  97         WriteSeqReg(1, seq01);          // turn the screen on/off
  98         OUTREG8(DPMS_SYNC_SELECT, dpmsSyncSelect);              // set DPMS mode
  99
 100         return B_OK;
 101 }