Keyboard led flash örneği

[Mehmet Demir]

/*
* kbleds.c - Blink keyboard leds until the module is unloaded.
*/

#include <linux/module.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/tty.h> /* For fg_console, MAX_NR_CONSOLES */
#include <linux/kd.h> /* For KDSETLED */
#include <linux/console_struct.h> /* For vc_cons */

MODULE_DESCRIPTION("Example module illustrating the use of Keyboard
LEDs.");
MODULE_AUTHOR("Daniele Paolo Scarpazza");
MODULE_LICENSE("GPL");

struct timer_list my_timer;
struct tty_driver *my_driver;
char kbledstatus = 0;

#define BLINK_DELAY HZ/5
#define ALL_LEDS_ON 0x07
#define RESTORE_LEDS 0xFF

/*
* Function my_timer_func blinks the keyboard LEDs periodically by
invoking
* command KDSETLED of ioctl() on the keyboard driver. To learn more
on virtual
* terminal ioctl operations, please see file:
* /usr/src/linux/drivers/char/vt_ioctl.c, function vt_ioctl().
*
* The argument to KDSETLED is alternatively set to 7 (thus causing
the led
* mode to be set to LED_SHOW_IOCTL, and all the leds are lit) and to
0xFF
* (any value above 7 switches back the led mode to LED_SHOW_FLAGS,
thus
* the LEDs reflect the actual keyboard status). To learn more on
this,
* please see file:
* /usr/src/linux/drivers/char/keyboard.c, function setledstate().
*
*/

static void my_timer_func(unsigned long ptr)
{
int *pstatus = (int *)ptr;

if (*pstatus == ALL_LEDS_ON)
*pstatus = RESTORE_LEDS;
else
*pstatus = ALL_LEDS_ON;

(my_driver->ioctl) (vc_cons[fg_console].d->vc_tty, NULL, KDSETLED,
*pstatus);

my_timer.expires = jiffies + BLINK_DELAY;
add_timer(&my_timer);
}

static int __init kbleds_init(void)
{
int i;

printk(KERN_INFO "kbleds: loading\n");
printk(KERN_INFO "kbleds: fgconsole is %x\n", fg_console);
for (i = 0; i < MAX_NR_CONSOLES; i++) {
if (!vc_cons[i].d)
break;
printk(KERN_INFO "poet_atkm: console[%i/%i] #%i, tty %lx\n", i,
MAX_NR_CONSOLES, vc_cons[i].d->vc_num,
(unsigned long)vc_cons[i].d->vc_tty);
}
printk(KERN_INFO "kbleds: finished scanning consoles\n");

my_driver = vc_cons[fg_console].d->vc_tty->driver;
printk(KERN_INFO "kbleds: tty driver magic %x\n", my_driver->magic);

/*
* Set up the LED blink timer the first time
*/
init_timer(&my_timer);
my_timer.function = my_timer_func;
my_timer.data = (unsigned long)&kbledstatus;
my_timer.expires = jiffies + BLINK_DELAY;
add_timer(&my_timer);

return 0;
}

static void __exit kbleds_cleanup(void)
{
printk(KERN_INFO "kbleds: unloading...\n");
del_timer(&my_timer);
(my_driver->ioctl) (vc_cons[fg_console].d->vc_tty, NULL, KDSETLED,
RESTORE_LEDS);
}

module_init(kbleds_init);
module_exit(kbleds_cleanup);