71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
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* kbbutil 0.2
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* A very basic application for controlling the keyboard backlight on OSX-running MacBooks.
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* Copyright 2014-15, Matthew Connelly.
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*/
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// includes {{{
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#include "kbbutil.h"
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//}}}
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// variable defs {{{
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io_connect_t io;
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uint64_t wtf=0; // I don't know what this is used for
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//}}}
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int getKBBrightness(void) {//{{{
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kern_return_t kr;
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uint32_t c_out=1, c_in=1;
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uint64_t cbr;
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kr = IOConnectCallScalarMethod(io,kGetLEDBrightnessID,&wtf,c_in,&cbr,&c_out);
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if(kr==kIOReturnBusy) { fprintf(stderr,"AppleLMUController IO is busy?\n"); return -1; }
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if(kr!=KERN_SUCCESS) { mach_error("IOKit error: ",kr); exit(kr); }
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return (int)cbr;
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}//}}}
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bool setKBBrightness(int nbr) {//{{{
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kern_return_t kr;
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uint32_t c_out=1,c_in=2;
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uint64_t cbr,sbr[2]={wtf,nbr};
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kr = IOConnectCallScalarMethod(io,kSetLEDBrightnessID,sbr,c_in,&cbr,&c_out);
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if(kr==kIOReturnBusy) { fprintf(stderr,"AppleLMUController IO is busy?\n"); return false; }
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if(kr!=KERN_SUCCESS) { mach_error("IOKit error: ",kr); exit(kr); }
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return true;
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}//}}}
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int main(int argc, char *argv []) {//{{{
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kern_return_t kr;
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io_service_t is;
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is = IOServiceGetMatchingService(kIOMasterPortDefault,IOServiceMatching("AppleLMUController"));
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if(!is) { fprintf(stderr,"Failed to get AppleLMUController service\n"); exit(1); }
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kr = IOServiceOpen(is,mach_task_self(),0,&io);
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IOObjectRelease(is);
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if(kr!=KERN_SUCCESS) { mach_error("IOKit error: ",kr); exit(kr); }
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//big argparsing block i intend to clean up later, but for now i've just formatted it more readably
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if
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(argc==1 ||
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(argc==2 &&
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(strcmp(argv[1],"-n")==0 ||
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strcmp(argv[1],"--numeric-only")==0)
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)
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)
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printf(argc==2? "%i\n" : "Current keyboard brightness: %i\n",getKBBrightness());
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else if
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(argc==2 && (
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(atoi(argv[1])==0 && strcmp(argv[1],"0")==0) ||
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(atoi(argv[1])> 0 && atoi(argv[1])<=4091)
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)
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) {
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if(!setKBBrightness(atoi(argv[1]))) {
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fprintf(stderr,"Error setting brightness to %i.\n",atoi(argv[1]));
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exit(1);
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}
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} else {
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fprintf(stderr,"Usage:\n\
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- kbbutil : Returns current brightness\n\
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- kbbutil [-n|--numeric-only] : Returns only integer brightness\n\
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- kbbutil [0-4091] : Set brightness\n");
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exit(1);
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}
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return 0;
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}//}}}
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