按键平台驱动:
platfrom_device.c:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
static struct resource key_resource[]=
{
[0] = {
.start = IRQ_EINT8,
.end = IRQ_EINT8,
.flags = IORESOURCE_IRQ,
},
[1] = {
.start = IRQ_EINT11,
.end = IRQ_EINT11,
.flags = IORESOURCE_IRQ,
},
[2]= {
.start = IRQ_EINT13,
.end = IRQ_EINT13,
.flags = IORESOURCE_IRQ,
},
[3] = {
.start = IRQ_EINT14,
.end = IRQ_EINT14,
.flags = IORESOURCE_IRQ,
},
[4] = {
.start = IRQ_EINT15,
.end = IRQ_EINT15,
.flags = IORESOURCE_IRQ,
},
[5] = {
.start = IRQ_EINT19,
.end = IRQ_EINT19,
.flags = IORESOURCE_IRQ,
},
};
struct platform_device *my_buttons_dev;
static int __init platform_dev_init(void)
{
int ret;
my_buttons_dev = platform_device_alloc("my_buttons", -1);
platform_device_add_resources(my_buttons_dev,key_resource,6);//添加资源一定要用该函数,不能使用对platform_device->resource幅值
//否则会导致platform_device_unregister调用失败,内核异常。
ret = platform_device_add(my_buttons_dev);
if(ret)
platform_device_put(my_buttons_dev);
return ret;
}
static void __exit platform_dev_exit(void)
{
platform_device_unregister(my_buttons_dev);
}
module_init(platform_dev_init);
module_exit(platform_dev_exit);
MODULE_AUTHOR("Z-YP");
MODULE_LICENSE("GPL");
platfrom_derver.c:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define DEVICE_NAME "my_buttons"
struct button_irq_desc {
int irq;
int pin;
int pin_setting;
int number;
char *name;
};
static struct button_irq_desc button_irqs [] = {
{IRQ_EINT8 , S3C2410_GPG(0) , S3C2410_GPG0_EINT8 , 0, "KEY0"},
{IRQ_EINT11, S3C2410_GPG(3) , S3C2410_GPG3_EINT11 , 1, "KEY1"},
{IRQ_EINT13, S3C2410_GPG(5) , S3C2410_GPG5_EINT13 , 2, "KEY2"},
{IRQ_EINT14, S3C2410_GPG(6) , S3C2410_GPG6_EINT14 , 3, "KEY3"},
{IRQ_EINT15, S3C2410_GPG(7) , S3C2410_GPG7_EINT15 , 4, "KEY4"},
{IRQ_EINT19, S3C2410_GPG(11), S3C2410_GPG11_EINT19, 5, "KEY5"},
};
static volatile char key_values [] = {'0', '0', '0', '0', '0', '0'};
static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
static volatile int ev_press = 0;
static irqreturn_t buttons_interrupt(int irq, void *dev_id)
{
struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
int down;
// udelay(0);
down = !s3c2410_gpio_getpin(button_irqs->pin);
if (down != (key_values[button_irqs->number] & 1)) { // Changed
key_values[button_irqs->number] = '0' + down;
ev_press = 1;
wake_up_interruptible(&button_waitq);
}
return IRQ_RETVAL(IRQ_HANDLED);
}
static int s3c24xx_buttons_open(struct inode *inode, struct file *file)
{
int i;
int err = 0;
for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
if (button_irqs[i].irq < 0) {
continue;
}
err = request_irq(button_irqs[i].irq, buttons_interrupt, IRQ_TYPE_EDGE_BOTH,
button_irqs[i].name, (void *)&button_irqs[i]);
if (err)
break;
}
if (err) {
-
i--;