191 lines
6.6 KiB
C
191 lines
6.6 KiB
C
/*
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File: PWM.c
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Contains: This file contains the hardware specific routines to control a PWM-based
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interface found on Asahi, TIM, DB-Lite.
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Written by: Andy Gong x6595
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Copyright: © 1990-1993 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<SM3> 2/11/93 CSS Update from Horror. Comments follow:
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<H10> 6/30/92 ag Moved cpu depended initialization code to cpu.c file, input
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routines to input.c, and table routines to backlight.c file.
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<H9> 5/26/92 ag Added write to PONTI to turnoff backlight through PONTI bit.
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<H8> 5/7/92 ag Use new table record for min/max limits. Added new entry for
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Dartanian.
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<H7> 4/24/92 ag set default to single table operation except on TIM (LC). added
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new vector for custom input control to handle hardware
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dependencies.
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<H6> 12/17/91 SWC Added boxDBLiteLC to the list in InitPWMControls. Grouped boxTIM
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and boxDartanian since their code is identical.
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<H5> 12/16/91 HJR Added boxDartanian to the list.
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<H4> 9/10/91 SWC Changed Get_AtoD to get the current setting of the up/down
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buttons.
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<H3> 8/27/91 SWC Changed references to get/set contrast to use get/set brightness
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on machines other than TIM. On TIM, they used the contrast
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command to control screen brightness. Added PWM table for
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DB-Lite.
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<H2> 8/5/91 SWC Changed Get_AtoD to use GetScreenCmd to get the current contrast
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instead of reading from the A-D if not on TIM.
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<3> 3/24/92 JSM Nuke boxFlag codenames.
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<2> 3/23/92 JSM OSEvents.h is obsolete, use Events.h.
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<1> 10/24/91 SAM/KSM Rolled in Regatta file.
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Regatta Change History:
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<6> 8/29/91 SAM (ag) changed power manager call "BatteryStatusImmCmd" for more
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responsiveness.
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<5> 7/18/91 SAM (ag) changed initialization code. converted to table only brightness
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levels.
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<4> 6/30/91 SAM Merged from TERROR [<4><5><6><7><8>].
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<3> 6/14/91 SAM (ag) Turnoff backlight at close. Changed low power handling
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code, to rescale pot to lower range.
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<1> 5/15/91 SAM Split off from TERRORProj.
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Terror Change History:
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<8> 6/27/91 ag fixed bug with init powerbook 100, initialize table based data
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only on table based hardware.
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<7> 6/27/91 ag centralize table determination code "LowTable".
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<6> 6/27/91 ag code clean up.
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<5> 6/26/91 ag added support for table change as a function of charger and
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voltage.
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<4> 6/24/91 ag Changed look up table size to byte elements. Added software
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scale control. Added software setting controls. Added software
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table control.
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<3> 6/10/91 ag Changed low power handling code, to rescale pot to lower range.
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<2> 6/5/91 ag turnoff backlight at close
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*/
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/*page*/
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/************************************/
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/*** INCLUDE FILES DECLARATIONS ***/
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#include <SysEqu.h>
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#include <types.h>
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#include <memory.h>
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#include <Events.h>
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#include <devices.h>
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#include <errors.h>
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#include <retrace.h>
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#include <Shutdown.h>
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#include <stdlib.h>
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#include "PowerMgr.h"
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#include "backlight.h"
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/*page
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***************************************************************************************************
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** PWM software ***********************************************************************************
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***************************************************************************************************
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*/
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OSErr InitPWMControls(driverGlobalPtr globalPtr)
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{
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unsigned int startvalue;
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/* initialize dual table variables */
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if (globalPtr->dualTable)
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{
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globalPtr->slewLimit = true; /* maximum change per/accrun */
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(*globalPtr->tableProc)(globalPtr); /* determine table based on current charger state */
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};
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/* initialize backlight hardware */
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startvalue = (*globalPtr->userInputProc)(globalPtr); /* <H8> */
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globalPtr->userBrightness = -1;
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globalPtr->userBrightness = (*globalPtr->setlevelproc)(startvalue,globalPtr); /* <H8> */
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return(noErr);
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};
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/*
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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int PWMCloseRoutine (driverGlobalPtr globalPtr)
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{
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(*globalPtr->setlevelproc)(globalPtr->settingTable->minimum,globalPtr);
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return(0);
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};
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/*page
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***************************************************************************************************
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*
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* The control routineÉ
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*
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* return:
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* noErr - task completed successfully
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* controlErr - illegal control selector
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*
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*
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***************************************************************************************************
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*/
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OSErr PWMControl(CntrlParam *ctlPB,driverGlobalPtr globalPtr) /* 'open' entry point */
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{
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int error;
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int tempvalue;
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error = noErr;
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if (!globalPtr->disableHWinput) /* if hardware not disabled, error */
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error = controlErr;
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else
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switch(ctlPB->csCode)
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{
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case kSetScreenBrightness: /* set brightness level */
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tempvalue = ctlPB->csParam[0];
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globalPtr->userBrightness = (*globalPtr->setlevelproc)(tempvalue,globalPtr);
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break;
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default:
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error = controlErr;
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};
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return(error);
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};
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/*
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***************************************************************************************************
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*
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*
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***************************************************************************************************
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*/
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int SetPWM(int new,driverGlobalPtr globalPtr)
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{
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PMgrPBlock pb; /* power manager pb */
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unsigned char val; /* hardware value setting */
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PEG_TO_LIMITS(new, globalPtr->maximumTable[globalPtr->powerRange], globalPtr->settingTable->minimum); /* <H8> use new tables */ /* limit value to valid range */
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val = globalPtr->settingTable->table[new]; /* look up value from table */
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if ((globalPtr->userBrightness >= 0) && (val == globalPtr->lastHWSetting)) return(new);/* nothing to do; 90/05/15 just turn on; 90/07/02 avoid touching */
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if (globalPtr->slewChange)
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{
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if (abs(globalPtr->lastHWSetting - val) > globalPtr->slewLimit)
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val = globalPtr->lastHWSetting + ((globalPtr->lastHWSetting > val) ? -globalPtr->slewLimit : globalPtr->slewLimit);
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else
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globalPtr->slewChange = false;
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};
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globalPtr->lastHWSetting = val; /* save the new hardware setting */
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pb.pmgrCmd = SetBrightnessCmd; /* everyone else uses "set brightness" */
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pb.pmgrCnt = 1;
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pb.pmgrXPtr = &val;
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pb.pmgrRPtr = nil;
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PMgr(&pb); /* set the pwm */
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return(new); /* return the current value */
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};
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