3rd-party/linux-kernel-module-cheat
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shared irqs work for keyboard and mouse input

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Ciro Santilli
2017-06-15 11:30:40 +01:00
parent 3556eef2fc
commit 2120c47262
1 changed files with 11 additions and 3 deletions
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14
kernel_module/irq.c
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@@ -2,13 +2,17 @@
TODO: get handler running multiple times on some existing interrupt from /proc/interrupts. TODO: get handler running multiple times on some existing interrupt from /proc/interrupts.
*/ */
#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
#include <linux/fs.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#define NAME "lkmc_character_device"
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
static int major;
static int irq = 0; static int irq = 0;
module_param_named(i, irq, int, S_IRUSR); module_param_named(i, irq, int, S_IRUSR);
MODULE_PARM_DESC(i, "irq line number"); MODULE_PARM_DESC(i, "irq line number");
@@ -23,21 +27,24 @@ MODULE_PARM_DESC(i, "irq line number");
*/ */
static irqreturn_t handler(int irq, void *v) static irqreturn_t handler(int irq, void *v)
{ {
pr_info("handler irq = %d jiffies = %llx\n", irq, (unsigned long long)jiffies); pr_info("handler irq = %d\n", irq);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
static const struct file_operations fops;
static int myinit(void) static int myinit(void)
{ {
int ret; int ret;
major = register_chrdev(0, NAME, &fops);
for (int i = 0; i < 128; ++i) { for (int i = 0; i < 128; ++i) {
ret = request_irq( ret = request_irq(
i, i,
handler, handler,
IRQF_SHARED, IRQF_SHARED,
"myirqhandler0", "myirqhandler0",
NULL &major
); );
pr_info("request_irq irq = %d ret = %d\n", i, ret); pr_info("request_irq irq = %d ret = %d\n", i, ret);
} }
@@ -47,6 +54,7 @@ static int myinit(void)
static void myexit(void) static void myexit(void)
{ {
free_irq(irq, NULL); free_irq(irq, NULL);
unregister_chrdev(major, NAME);
} }
module_init(myinit) module_init(myinit)