fg_console undecleared error,

[Dufresne]

Hi,
I've tried to compile a module that i took from a kernel module programming guide,

/* 
 *  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);

but , when i compile this, i get compile errors , some of them i fixed but
i couldn't fix one,
It says ;

error: ‘fg_console’ undeclared (first use in this function)

In the code it says;

#include <linux/tty.h>		/* For fg_console, MAX_NR_CONSOLES */

when open that header, tty.h with gedit , i couldn't see any variable named fg_console.
How can i fix this problem ?
My kernel version is 2.6.31-20.

Or is there any other way to flash keyboard led ? any example module?

Thanks in advance,

[Helmik]

try this:

#include <linux/vt_kern.h>  //for fg_console

But i have another compilation error:

error: 'struct tty_driver' has no member named 'ioctl':

it is caused by this line:

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

seems, due to changes in kernel, struct tty_driver does not include function ioctl, it is located in struct tty_operations now, but i have no any knowledge in tty drivers so i can not fix this. Can anybody compile this program for me? i think it is one of the most interesting and simplest drivers, and i want to see how it works.Please.

[crazymutant]

write in your code this:

extern int fg_console;

[crazymutant]

for Helmik:

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

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

[Helmik]

Thank you!!! that is what i exactly was looking for... but i have used another way already, i've mapped System.map file and got setledstate and getledstate functions from there.

[godpy]

Hello, I am a newbie in kernel programming and i read your posts..i tried it out with the following results.
@crazymutant: i had the same problem as Helmik... so i replaced mydriver->ioctl by mydriver->ops...but then i got the following error...
error: called object mydriver->ops not a function.
Please help.