V-USB Keyboard LED

#include <linux/input.h>

.

.

.

int main (int argc, char *argv[])

{

  device = argv[1];

  //Open Device

  if ((fd = open (device, O_RDWR)) == -1)

    printf ("%s is not a vaild device.\n", device);

  //Print Device Name

  ioctl (fd, EVIOCGNAME (sizeof (name)), name);

  printf ("Reading From : %s (%s)\n", device, name);

  struct input_event ev; /* the event */

  ev.type = EV_LED;

  ev.code = LED_CAPSL;

  /* turn off */

  ev.value = 0;

  int retval = write(fd, &ev, sizeof(struct input_event));

  /* turn on */

  ev.value = 1;

  int retval = write(fd, &ev, sizeof(struct input_event));

/* ------------------------------------------------------------------------- */

/* ----------------------------- USB interface ----------------------------- */

/* ------------------------------------------------------------------------- */

static uchar    reportBuffer[2];    /* buffer for HID reports */

static uchar    idleRate;           /* in 4 ms units */

PROGMEM char usbHidReportDescriptor[35] = { /* USB report descriptor */

    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)

    0x09, 0x06,                    // USAGE (Keyboard)

    0xa1, 0x01,                    // COLLECTION (Application)

    0x05, 0x07,                    //   USAGE_PAGE (Keyboard)

    0x19, 0xe0,                    //   USAGE_MINIMUM (Keyboard LeftControl)

    0x29, 0xe7,                    //   USAGE_MAXIMUM (Keyboard Right GUI)

    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)

    0x25, 0x01,                    //   LOGICAL_MAXIMUM (1)

    0x75, 0x01,                    //   REPORT_SIZE (1)

    0x95, 0x08,                    //   REPORT_COUNT (8)

    0x81, 0x02,                    //   INPUT (Data,Var,Abs)

    0x95, 0x01,                    //   REPORT_COUNT (1)

    0x75, 0x08,                    //   REPORT_SIZE (8)

    0x25, 0x65,                    //   LOGICAL_MAXIMUM (101)

    0x19, 0x00,                    //   USAGE_MINIMUM (Reserved (no event indicated))

    0x29, 0x65,                    //   USAGE_MAXIMUM (Keyboard Application)

    0x81, 0x00,                    //   INPUT (Data,Ary,Abs)

    0xc0                           // END_COLLECTION

};

/* We use a simplifed keyboard report descriptor which does not support the

 * boot protocol. We don't allow setting status LEDs and we only allow one

 * simultaneous key press (except modifiers). We can therefore use short

 * 2 byte input reports.

 * The report descriptor has been created with usb.org's "HID Descriptor Tool"

 * which can be downloaded from http://www.usb.org/developers/hidpage/.

 * Redundant entries (such as LOGICAL_MINIMUM and USAGE_PAGE) have been omitted

 * for the second INPUT item.

 */