9th_led_bus_drv_dev

#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>

/* 分配/设置/注册一个platform_device */

static struct resource led_resource[] = {
    [0] = {
        .start = 0x56000050,
        .end   = 0x56000050 + 8 - 1,
        .flags = IORESOURCE_MEM,
    },
    [1] = {
        .start = 5,
        .end   = 5,
        .flags = IORESOURCE_IRQ,
    }
};

static void led_release(struct device * dev)
{
}

static struct platform_device led_dev = {
    .name         = "myled",
    .id       = -1,
    .num_resources    = ARRAY_SIZE(led_resource),
    .resource     = led_resource,
    .dev = { 
    .release = led_release, 
},
};

static int led_dev_init(void)
{
platform_device_register(&led_dev);
return 0;
}


static void led_dev_exit(void)
{
platform_device_unregister(&led_dev);
}


module_init(led_dev_init);
module_exit(led_dev_exit);

MODULE_LICENSE("GPL");

//////////////////////////////////////led_drv.c

/* 分配/设置/注册一个platform_driver */
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

static int major;

static struct class *cls;
static volatile unsigned long *gpio_con;
static volatile unsigned long *gpio_dat;
static int pin;

static int led_open(struct inode *inode, struct file *file)
{
//printk("first_drv_open\n");
/* 配置为输出 */
*gpio_con &= ~(0x3<<(pin*2));
*gpio_con |= (0x1<<(pin*2));
return 0;
}

static ssize_t led_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
{
int val;

//printk("first_drv_write\n");

copy_from_user(&val, buf, count); //copy_to_user();

if (val == 1)
{
// 点灯
*gpio_dat &= ~(1<<pin);
}
else
{
// 灭灯
*gpio_dat |= (1<<pin);
}

return 0;
}
static struct file_operations led_fops = {
    .owner  =   THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
    .open   =   led_open,     
.write = led_write,   
};

static int led_probe(struct platform_device *pdev)
{
struct resource*res;

/* 根据platform_device的资源进行ioremap */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
gpio_con = ioremap(res->start, res->end - res->start + 1);
gpio_dat = gpio_con + 1;

res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
pin = res->start;

/* 注册字符设备驱动程序 */

printk("led_probe, found led\n");

major = register_chrdev(0, "myled", &led_fops);

cls = class_create(THIS_MODULE, "myled");

class_device_create(cls, NULL, MKDEV(major, 0), NULL, "led"); /* /dev/led */

return 0;
}

static int led_remove(struct platform_device *pdev)
{
/* 卸载字符设备驱动程序 */
/* iounmap */
printk("led_remove, remove led\n");

class_device_destroy(cls, MKDEV(major, 0));
class_destroy(cls);
unregister_chrdev(major, "myled");
iounmap(gpio_con);

return 0;
}

struct platform_driver led_drv = {
.probe = led_probe,
.remove = led_remove,
.driver = {
.name = "myled",
}
};

static int led_drv_init(void)
{
platform_driver_register(&led_drv);
return 0;
}

static void led_drv_exit(void)
{
platform_driver_unregister(&led_drv);
}

module_init(led_drv_init);
module_exit(led_drv_exit);
MODULE_LICENSE("GPL");


///////////led_test.c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

/* led_test on
 * led_test off
 */
int main(int argc, char **argv)
{
int fd;
int val = 1;
fd = open("/dev/led", O_RDWR);
if (fd < 0)
{
printf("can't open!\n");
}
if (argc != 2)
{
printf("Usage :\n");
printf("%s <on|off>\n", argv[0]);
return 0;
}


if (strcmp(argv[1], "on") == 0)
{
val  = 1;
}
else
{
val = 0;
}

write(fd, &val, 4);
return 0;
}