乙個簡單的LED驅動 不基於驅動框架

驅動：

#include

#include

#include

#include

#include

#include

#include

static int led_major = -1;

static struct class * led_mark_class = null;

static struct device * led_mark_device = null;

static struct resource * res_mark = null;

#define gpj0con (0xe0200240)

#define gpj0dat (0xe0200244)

typedef struct p_data_mark

p_data_mark;

unsigned int * p_data_test = null;

unsigned int * p_data_data = null;

static p_data_mark * p_data_mark = null;

static char buf[4] = ;

static int led_mark_open (struct inode * inode, struct file * file)

static int led_mark_close (struct inode * inode, struct file * file)

static ssize_t led_mark_write(struct file * file, const char __user * in,

size_t size, loff_t * off)

// printk(kern_err 「buf = %s\n」, buf);

if (『0』 == buf[0])

else

return 0;

}static struct file_operations led_operations_mark =

;static int __init s5pv210_led_init(void)

led_mark_class = class_create(this_module, 「led_mark」);

if (!led_mark_class)

led_mark_device = device_create(led_mark_class,

null, mkdev(led_major, 0), null, 「led-mark」);

if (!led_mark_device)

res_mark = request_mem_region(gpj0con, sizeof(p_data_mark), "p_data");

if (!res_mark)
p_data_mark = ioremap(gpj0con, sizeof(p_data_mark));
if (!p_data_mark)
printk(kern_err "%p \n", p_data_mark);
p_data_mark->con |= ((1<<12) | (1<<16) | (1<<20));
p_data_mark->dat &= ~((1<<3) | (1<<4) | (1<<5));
return 0;

release_mem_region(gpj0con, sizeof(p_data_mark));

err_request_mem_region:

device_destroy(led_mark_class, mkdev(led_major, 0));

err_device_create:

class_destroy(led_mark_class);

err_class_create:

unregister_chrdev(led_major, 「led_driver」);

err_register_chrdev:

return -1;

}static void __exit s5pv210_led_exit(void)

module_init(s5pv210_led_init);

module_exit(s5pv210_led_exit);

// module_***這種巨集作用是用來新增模組描述資訊

module_license(「gpl」); // 描述模組的許可證

module_author(「mark [email protected]」); // 描述模組的作者

module_description(「s5pv210 led driver」); // 描述模組的介紹資訊

module_alias(「s5pv210_led」); // 描述模組的別名資訊

應用程式：

#include

#include

#include

#include

#include

#define pathname 「/dev/led-mark」

int main(void)

write(fd, 「1」, 1);

sleep(1);

write(fd, 「0」, 1);

sleep(1);

write(fd, 「1」, 1);

sleep(1);

write(fd, 「0」, 1);

sleep(1);

close(fd);

return 0;

}

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