Pileus Git - ~andy/hwkeys/blob - hwkeys.c

   1 #include <math.h>
   2 #include <stdio.h>
   3
   4 #include <unistd.h>
   5 #include <fcntl.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <linux/input.h>
   9
  10 static void screenlight(int up)
  11 {
  12         static const char *path = "/sys/class/backlight/gmux_backlight/brightness";
  13         static int    prev, next, tmp;
  14         static double val;
  15         static FILE  *fd;
  16
  17         // Open brightness file
  18         if (fd == NULL)
  19                 fd = fopen(path, "r+");
  20         if (fd == NULL) {
  21                 printf("error opening file\n");
  22                 return;
  23         }
  24
  25         // Reset if someone else changed the value
  26         fseek(fd, 0, SEEK_SET);
  27         fscanf(fd, "%d", &tmp);
  28         if (tmp != prev)
  29                 val = pow(tmp/1024.0, 1/10.0);
  30         //if (tmp != prev)
  31         //      printf("convert: %d -> %d -> %f\n",
  32         //                      prev, tmp, val);
  33
  34         // Update the current value
  35         val += 0.01 * (up?1:-1);
  36         if (val < 0) val = 0;
  37         if (val > 1) val = 1;
  38
  39         // Write it back to the file
  40         next = pow(val, 10) * 1024;
  41         if (next == prev)
  42                 next += (up?1:-1);
  43         else
  44                 prev = next;
  45
  46         //printf("saving:  %d\n", next);
  47         fprintf(fd, "%d", next);
  48         fflush(fd);
  49 }
  50
  51 static void keylight(int up)
  52 {
  53         //static const char *path = "/sys/class/leds/smc::kbd_backlight/brightness";
  54 }
  55
  56 int main(int argc, char **argv)
  57 {
  58         struct input_event ev;
  59         int fd, len, debug=0;
  60
  61         //if ((fd = open("/dev/input/event4", O_RDONLY)) < 0) {
  62         //if ((fd = open("/dev/input/event6", O_RDONLY)) < 0) {
  63         if ((fd = open("/dev/input/event10", O_RDONLY)) < 0) {
  64                 printf("Error\n");
  65                 return 0;
  66         }
  67
  68         while ((len = read(fd, &ev, sizeof(ev)))) {
  69                 if (len != sizeof(ev)) {
  70                         printf("Error\n");
  71                         sleep(1);
  72                         continue;
  73                 }
  74
  75                 if (debug) {
  76                         printf("%ld.%06lu: type=%04hx code=%04hx val=%08x\n",
  77                                         ev.time.tv_sec,
  78                                         ev.time.tv_usec,
  79                                         ev.type, ev.code, ev.value);
  80                         fflush(stdout);
  81                 }
  82
  83                 if (ev.type != EV_KEY)
  84                         continue;
  85                 if (ev.value == 0) // key up
  86                         continue;
  87
  88                 switch (ev.code) {
  89                         case KEY_BRIGHTNESSDOWN:
  90                                 screenlight(0);
  91                                 break;
  92                         case KEY_BRIGHTNESSUP:
  93                                 screenlight(1);
  94                                 break;
  95                         case KEY_KBDILLUMDOWN:
  96                                 keylight(0);
  97                                 break;
  98                         case KEY_KBDILLUMUP:
  99                                 keylight(1);
 100                                 break;
 101                 }
 102                 fflush(stdout);
 103         }
 104         return 0;
 105 }