Created
September 20, 2013 03:50
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Timers in device drivers
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| #include "timer.h" | |
| #define MAX_SIZE 48 | |
| static int timer_val = 100; | |
| module_param(timer_val, int, 0); | |
| MODULE_PARM_DESC(timer_val, "Configurable, default timer is set to 100msec's"); | |
| static int arr[10]; | |
| static int p; | |
| module_param_array(arr, int, &p, 0644); | |
| MODULE_PARM_DESC(arr, "Array need to be initialized"); | |
| static char str[] = "Test String"; | |
| module_param_string(s, str, MAX_SIZE, 0644); | |
| MODULE_PARM_DESC(str, "Default string is \"Test String\", can be changed"); | |
| static char *sp; | |
| module_param(sp, charp, 0644); | |
| MODULE_PARM_DESC(sp, "Char pointer, default is NULL"); | |
| struct timer_list timer; | |
| void timer_func(unsigned long data) | |
| { | |
| printk("Inside timer function \n"); | |
| } | |
| static int __init timer_init(void) | |
| { | |
| int ret; | |
| int i = 0; | |
| char *p = "Gautham Kantharaju"; | |
| setup_timer(&timer, timer_func, 0); | |
| if ((ret = mod_timer(&timer, jiffies + msecs_to_jiffies(timer_val)))) | |
| printk("Modify timer error \n"); | |
| else | |
| printk("Modify timer success \n"); | |
| for(i=0; i < 10; i++) | |
| printk("arr[%d]=%d \n", i, arr[i]); | |
| printk("String from cmdline is= %s \t %s \t %s \n", str, sp, p); | |
| return 0; | |
| } | |
| static void __exit timer_exit(void) | |
| { | |
| if (!(timer_pending(&timer))) | |
| { | |
| del_timer( &timer ); | |
| printk("Kernel timer deleted \n"); | |
| } | |
| printk("Unloading timer module \n"); | |
| } | |
| module_init(timer_init); | |
| module_exit(timer_exit); | |
| MODULE_LICENSE("GPL"); | |
| MODULE_AUTHOR("Gautham Kantharaju <gautham.kantharaju@gmail.com>"); | |
| MODULE_DESCRIPTION("Kernel timer usage driver"); |
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| #ifndef _TIMER_H_ | |
| #define _TIMER_H_ | |
| #include <linux/module.h> | |
| #include <linux/init.h> | |
| #include <linux/fs.h> | |
| #include <linux/slab.h> | |
| #include <linux/timer.h> | |
| #endif /* _TIMER_H_ */ |
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