86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/* teres1-debug.c - debug mode switch
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Copyright (C) 2018 Chris Boudacoff
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <linux/input.h>
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#include <unistd.h>
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#include <sys/types.h>
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#define DEBUGEN 361
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void export_gpio(int gpio)
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{
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int fd;
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char buf[255];
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fd = open("/sys/class/gpio/export", O_WRONLY);
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sprintf(buf, "%d", gpio);
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write(fd, buf, strlen(buf));
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close(fd);
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sprintf(buf, "/sys/class/gpio/gpio%d/direction", gpio);
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fd = open(buf, O_WRONLY);
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write(fd, "out", 3);
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close(fd);
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}
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void set_gpio(int gpio, int value)
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{
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char buf[255];
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sprintf(buf, "/sys/class/gpio/gpio%d/value", gpio);
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int fd = open(buf, O_WRONLY);
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sprintf(buf, "%d", value);
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write(fd, buf, 1);
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close(fd);
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}
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void usage(void)
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{
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extern char *program_invocation_short_name;
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printf("USAGE:\n");
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printf(" sudo %s on|off\n", program_invocation_short_name);
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printf("\n");
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}
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int main (int argc, char **argv)
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{
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int mode;
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uid_t uid=getuid(), euid=geteuid();
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if (uid!=0 || uid!=euid || !argv[1]) {
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usage();
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exit(0);
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}else{
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if (strcmp(argv[1],"off")==0) mode = 1;
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else if (strcmp(argv[1],"on")==0) mode = 0;
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else { usage(); exit(0); }
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export_gpio(DEBUGEN);
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set_gpio(DEBUGEN, mode);
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printf("Debuging via serial cable on headphone port is %s\r\n",argv[1]);
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return 0;
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}
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}
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