48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/*
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* kbbutil 0.1
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* A very basic application for controlling the keyboard backlight on OSX-running MacBooks.
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* Copyright 2014, 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;
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//}}}
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int getKBBrightness() {//{{{
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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 into AppleLMUController\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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if(argc==1||(argc==2&&(strcmp(argv[1],"-n")==0||strcmp(argv[1],"--numeric-only")==0))) printf(argc==2? "%i" : "Current keyboard brightness: %i\n",getKBBrightness());
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else if(argc==2&&((atoi(argv[1])==0&&strcmp(argv[1],"0")==0)||(atoi(argv[1])>0&&atoi(argv[1])<=4091))) setKBBrightness(atoi(argv[1]));
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else {fprintf(stderr,"Invalid argument. kbbutil must be run either with no arguments, with -n or --numeric-only, or with one argument which is a number between 0 and 4091.\n");exit(1);}
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return 0;
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}//}}}
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