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/*
References:
http://www.linuxquestions.org/questions/linux-newbie-8/reading-mouse-device-615178/

http://www.linuxjournal.com/article/6396
http://www.linuxjournal.com/article/6429

*/

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

#include <linux/input.h>

#define KEYBOARDEVENTS "/dev/input/event1"

void Listing1(fd)
{
int version;

/* ioctl() accesses the underlying driver */
if (ioctl(fd, EVIOCGVERSION, &version))
{
     perror("evdev ioctl");
}

/* the EVIOCGVERSION ioctl() returns an int */
/* so we unpack it and display it */
printf("evdev driver version is %d.%d.%d\n",
        version >> 16, (version >> 8) & 0xff,
        version & 0xff);
}

void Listing3(fd)
{
struct input_id device_info;

/* suck out some device information */
if(ioctl(fd, EVIOCGID, &device_info)) {
     perror("evdev ioctl");
}

/* the EVIOCGID ioctl() returns input_devinfo
* structure - see <linux/input.h>
* So we work through the various elements,
* displaying each of them
*/
printf("vendor %04hx product %04hx version %04hx",
        device_info.vendor, device_info.product,
        device_info.version);

switch ( device_info.bustype)
{
  case BUS_PCI :
      printf(" is on a PCI bus\n");
      break;
  case BUS_USB :
      printf(" is on a Universal Serial Bus\n");
      break;
case BUS_BLUETOOTH:
printf(" is on a Bluetooth bus\n");
break;

default:
printf(" is a Bus\n");

}
}

void Listing4(fd)
{
char name[256] = "Unknown";

if(ioctl(fd, EVIOCGNAME(sizeof(name)), name) < 0)
{
     perror("evdev ioctl");
}

printf("The device on says its name is %s\n",name);
}

void Listing5(fd)
{
char phys[256] = "Unknown";

if(ioctl(fd, EVIOCGPHYS(sizeof(phys)), phys) < 0) {
     perror("event ioctl");
}
printf("The device on says its path is %s\n", phys);
}

void Listing6(fd)
{
char uniq[256] = "NO ID";
if(ioctl(fd, EVIOCGUNIQ(sizeof(uniq)), uniq) < 0) {
     perror("event ioctl");
}

printf("The device on says its identity is %s\n", uniq);
}

void Listing7(fd)
{
struct input_event evtype_b;

memset(evtype_b, 0, sizeof(evtype_b));
if (ioctl(fd, EVIOCGBIT(0, EV_MAX), evtype_b) < 0)
{
perror("evdev ioctl");
}

printf("Supported event types:\n");

for (yalv = 0; yalv < EV_MAX; yalv++)
{
if (test_bit(yalv, evtype_b))
{
/* the bit is set in the event types list */
printf(" Event type 0x%02x ", yalv);
switch ( yalv)
            {
case EV_SYN :
printf(" (Synch Events)\n");
                break;
case EV_KEY :
printf(" (Keys or Buttons)\n");
                break;
case EV_REL :
printf(" (Relative Axes)\n");
                break;
case EV_ABS :
printf(" (Absolute Axes)\n");
                break;
case EV_MSC :
printf(" (Miscellaneous)\n");
                break;
case EV_LED :
printf(" (LEDs)\n");
                break;
case EV_SND :
printf(" (Sounds)\n");
                break;
case EV_REP :
printf(" (Repeat)\n");
                break;
case EV_FF :
case EV_FF_STATUS:
printf(" (Force Feedback)\n");
                break;
case EV_PWR:
printf(" (Power Management)\n");
                break;
default:
printf(" (Unknown: 0x%04hx)\n",yalv);
            }
}
}
}

void Listing8(fd)
{
/* how many bytes were read */
size_t rb;
/* the events (up to 64 at once) */
struct input_event ev[64];

rb=read(fd,ev,sizeof(struct input_event)*64);

if (rb < (int) sizeof(struct input_event))
{
perror("evtest: short read");
exit (1);
}

for (yalv = 0;
yalv < (int) (rb / sizeof(struct input_event));
yalv++)
{
if (EV_KEY == ev[yalv].type)
printf("%ld.%06ld ",
ev[yalv].time.tv_sec,
ev[yalv].time.tv_usec,
printf("type %d code %d value %d\n",
               ev[yalv].type,
               ev[yalv].code, ev[yalv].value);
}
}

void Listing9(fd)
{
struct input_event ev; /* the event */

/* we turn off all the LEDs to start */
ev.type = EV_LED;
ev.code = LED_CAPSL;
ev.value = 0;
retval = write(fd, &ev, sizeof(struct input_event));

ev.code = LED_NUML;
retval = write(fd, &ev, sizeof(struct input_event));
ev.code = LED_SCROLLL;
retval = write(fd, &ev, sizeof(struct input_event));

while (1)
{
ev.code = LED_CAPSL;
ev.value = 1;
write(fd, &ev, sizeof(struct input_event));
usleep(200000);
ev.value = 0;
write(fd, &ev, sizeof(struct input_event));

ev.code = LED_NUML;
ev.value = 1;
write(fd, &ev, sizeof(struct input_event));
usleep(200000);
ev.value = 0;
write(fd, &ev, sizeof(struct input_event));
}
}

/*
Get the state of all the keys
at once.
*/
void Listing10(fd)
{
uint8_t key_b[KEY_MAX/8 + 1];
int yalv;

memset(key_b, 0, sizeof(key_b));

ioctl(fd, EVIOCGKEY(sizeof(key_b)), key_b);

for (yalv = 0; yalv < KEY_MAX; yalv++)
{
     if (test_bit(yalv, key_b))
{
         // the bit is set in the key state
         printf(" Key 0x%02x ", yalv);
         switch ( yalv)
            {
             case KEY_RESERVED :
                 printf(" (Reserved)\n");
                break;
             case KEY_ESC :
                 printf(" (Escape)\n");
                break;
            
// other keys / buttons not shown
case BTN_STYLUS2 :
                 printf(" (2nd Stylus Button )\n");
                break;

             default:
                 printf(" (Unknown key)\n");
            }
     }
}
}

void Listing11(fd)
{
struct input_event led_b;

memset(led_b, 0, sizeof(led_b));
ioctl(fd, EVIOCGLED(sizeof(led_b)), led_b);

for (yalv = 0; yalv < LED_MAX; yalv++)
{
if (test_bit(yalv, led_b))
{
/* the bit is set in the LED state */
printf(" LED 0x%02x ", yalv);
switch ( yalv)
            {
case LED_NUML :
                printf(" (Num Lock)\n");
                break;
case LED_CAPSL :
                printf(" (Caps Lock)\n");
                break;
/* other LEDs not shown here*/
default:
                printf(" (Unknown LED: 0x%04hx)\n", yalv);
            }
}
}
}

void Listing12(fd)
{
int rep[2];

if(ioctl(fd, EVIOCGREP, rep))
{
perror("evdev ioctl");
}

printf("[0]= %d, [1] = %d\n", rep[0], rep[1]);
}

void Listing13(fd)

int rep[2];

rep[0] = 2500;
rep[1] = 1000;

if(ioctl(fd, EVIOCSREP, rep))
{
perror("evdev ioctl");
}
}


void Listing14(fd)
{
int codes[2];

for (i=0; i<130; i++)
{
codes[0] = i;
if(ioctl(fd, EVIOCGKEYCODE, codes))
{
perror("evdev ioctl");
}
printf("[0]= %d, [1] = %d\n", codes[0], codes[1]);
}
}

void Listing15(fd)
{
int codes[2];

codes[0] = 58; /* M keycap */
codes[1] = 49; /* assign to N */

if(ioctl(fd, EVIOCSKEYCODE, codes))
{
perror("evdev ioctl");
}
}


void Listing17(fd)
{
uint8_t abs_b[ABS_MAX/8 + 1];
struct input_absinfo abs_feat;

ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_b)), abs_b);

printf("Supported Absolute axes:\n");

for (yalv = 0; yalv < ABS_MAX; yalv++)
{
if (test_bit(yalv, abs_b))
{
printf(" Absolute axis 0x%02x ", yalv);
switch ( yalv)
            {
case ABS_X :
                printf("(X Axis) ");
                break;
case ABS_Y :
                printf("(Y Axis) ");
                break;
default:
printf("(Unknown abs feature)");
            }
if(ioctl(fd, EVIOCGABS(yalv), &abs_feat))
{
perror("evdev EVIOCGABS ioctl");
}

printf("%d (min:%d max:%d flat:%d fuzz:%d)",
               abs_feat.value,
               abs_feat.minimum,
               abs_feat.maximum,
               abs_feat.flat,
               abs_feat.fuzz);

printf("\n");
}
}
}




int main (void)
{
static const bufflen = 256;
char buff[bufflen];
int kbd;
struct input_event ie;

if ((kbd = open(KEYBOARDEVENTS, O_RDONLY)) == -1) {
perror("opening device");
exit(EXIT_FAILURE);
}


Listing1(kbd);
Listing3(kbd);
Listing4(kbd);
Listing5(kbd);
Listing6(kbd);


close(kbd);

return 0;
}

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