mirror of
https://github.com/ioacademy-jikim/device_driver
synced 2025-06-07 16:06:08 +00:00
53 lines
814 B
C
53 lines
814 B
C
#if 1
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#define LED_RATIO _IOW( 'm', 1 , int)
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int main()
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{
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int fd, ret;
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int ratio;
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char buff[10];
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printf("밝기 입력( 0-255 ) : ");
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scanf("%d", &ratio );
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fd = open( "/dev/mydev", O_RDONLY );
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ret = ioctl(fd, LED_RATIO, &ratio);
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if( ret < 0 )
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{
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printf("ret=%d, errno=%d\n", ret, errno );
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return 0;
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}
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close(fd);
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return 0;
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}
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#endif
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#if 0
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#define LED_RATIO _IO( 'm', 1 )
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int main()
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{
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int fd, ret;
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char buff[10];
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fd = open( "/dev/mydev", O_RDONLY );
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ret = ioctl(fd, LED_RATIO);
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if( ret < 0 )
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{
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printf("ret=%d, errno=%d\n", ret, errno );
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return 0;
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}
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close(fd);
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return 0;
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}
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#endif
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