我在Linux驱动开发是一个新手。我读过一些关于这方面的书籍。初学者设备驱动程序开发的Linux
我开始像其他人(我认为)与“Hello World”的例子,但我想多。我发现这个代码在一本书:
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <linux/console_struct.h>
#include <linux/vt_kern.h>
MODULE_DESCRIPTION("Example module illustrating the use of Keyboard LEDs.");
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
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->ops->ioctl) (vc_cons[fg_console].d->port.tty, 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->port.tty);
}
printk(KERN_INFO "kbleds: finished scanning consoles\n");
my_driver = vc_cons[fg_console].d->port.tty->driver;
printk(KERN_INFO "kbleds: tty driver magic %x\n", my_driver->magic);
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->ops->ioctl) (vc_cons[fg_console].d->port.tty, KDSETLED,
RESTORE_LEDS);
}
module_init(kbleds_init);
module_exit(kbleds_cleanup);
我试图理解的代码,主要是我已经做了,但也有部分我不明白
例如:
(my_driver->ops->ioctl) (vc_cons[fg_console].d->port.tty, KDSETLED,
*pstatus);
和功能static int __init kbleds_init(void)
如果有人能帮助我解决这个问题!如果你想能够解释或者给我一个链接到一本书来理解这段代码