static int __x210_led_status[4] = { 0 };
static void __x210_led_probe(void)
{
int ret;
ret = gpio_request(S5PV210_GPJ0(3), "GPJ0");//注册gpio
if(ret < 0)
printk("x210-led: request gpio GPJ0(3) fail\n");
s3c_gpio_setpull(S5PV210_GPJ0(3), S3C_GPIO_PULL_UP);
s3c_gpio_cfgpin(S5PV210_GPJ0(3), S3C_GPIO_SFN(1));
gpio_set_value(S5PV210_GPJ0(3), 1);
ret = gpio_request(S5PV210_GPJ0(4), "GPJ0");
if(ret)
printk("x210-led: request gpio GPJ0(4) fail\n");
s3c_gpio_setpull(S5PV210_GPJ0(4), S3C_GPIO_PULL_UP);
s3c_gpio_cfgpin(S5PV210_GPJ0(4), S3C_GPIO_SFN(1));
gpio_set_value(S5PV210_GPJ0(4), 1);
ret = gpio_request(S5PV210_GPJ0(5), "GPJ0");
if(ret)
printk("x210-led: request gpio GPJ0(5) fail\n");
s3c_gpio_setpull(S5PV210_GPJ0(5), S3C_GPIO_PULL_UP);
s3c_gpio_cfgpin(S5PV210_GPJ0(5), S3C_GPIO_SFN(1));
gpio_set_value(S5PV210_GPJ0(5), 1);
ret = gpio_request(S5PV210_GPD0(1), "GPD0");
if(ret)
printk("x210-led: request gpio GPD0(1) fail\n");
s3c_gpio_setpull(S5PV210_GPD0(1), S3C_GPIO_PULL_UP);
s3c_gpio_cfgpin(S5PV210_GPD0(1), S3C_GPIO_SFN(1));
gpio_set_value(S5PV210_GPD0(1), 1);
__x210_led_status[0] = 0;//保存led的信息，为不亮
__x210_led_status[1] = 0;
__x210_led_status[2] = 0;
__x210_led_status[3] = 0;
}
static void __x210_led_remove(void)
{
gpio_free(S5PV210_GPJ0(3));//释放gpio
gpio_free(S5PV210_GPJ0(4));
gpio_free(S5PV210_GPJ0(5));
gpio_free(S5PV210_GPD0(1));
}
/************ /sys/devices/platform/ljj-x210-led/led1,led2,led3 文件的读 *************/
static ssize_t x210_led_read(struct device *dev, struct device_attribute *attr, char *buf)
{
if(!strcmp(attr->attr.name, "led1"))//判断是哪个文件
{
if(__x210_led_status[0] != 0)
return strlcpy(buf, "1\n", 3);
else
return strlcpy(buf, "0\n", 3);
}
else if(!strcmp(attr->attr.name, "led2"))
{
if(__x210_led_status[1] != 0)
return strlcpy(buf, "1\n", 3);
else
return strlcpy(buf, "0\n", 3);
}
else if(!strcmp(attr->attr.name, "led3"))
{
if(__x210_led_status[2] != 0)
return strlcpy(buf, "1\n", 3);
else
return strlcpy(buf, "0\n", 3);
}
else if(!strcmp(attr->attr.name, "led4"))
{
if(__x210_led_status[3] != 0)
return strlcpy(buf, "1\n", 3);
else
return strlcpy(buf, "0\n", 3);
}
return 0;
}
/************ /sys/devices/platform/ljj-x210-led/led1,led2,led3 文件的写 *************/
static ssize_t x210_led_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long on = simple_strtoul(buf, NULL, 10);
if(!strcmp(attr->attr.name, "led1"))
{
if(on)
{
gpio_set_value(S5PV210_GPJ0(3), 0);
__x210_led_status[0] = 1;
}
else
{
gpio_set_value(S5PV210_GPJ0(3), 1);
__x210_led_status[0] = 0;
}
}
else if(!strcmp(attr->attr.name, "led2"))
{
if(on)
{
gpio_set_value(S5PV210_GPJ0(4), 0);
__x210_led_status[1] = 1;
}
else
{
gpio_set_value(S5PV210_GPJ0(4), 1);
__x210_led_status[1] = 0;
}
}
else if(!strcmp(attr->attr.name, "led3"))
{
if(on)
{
gpio_set_value(S5PV210_GPJ0(5), 0);
__x210_led_status[2] = 1;
}
else
{
gpio_set_value(S5PV210_GPJ0(5), 1);
__x210_led_status[2] = 0;
}
}
else if(!strcmp(attr->attr.name, "led4"))
{
if(on)
{
gpio_set_value(S5PV210_GPD0(1), 0);
__x210_led_status[3] = 1;
}
else
{
gpio_set_value(S5PV210_GPD0(1), 1);
__x210_led_status[3] = 0;
}
}
return count;
}
static DEVICE_ATTR(led1, 0666, x210_led_read, x210_led_write);//绑定led那几个文件的操作函数
static DEVICE_ATTR(led2, 0666, x210_led_read, x210_led_write);
static DEVICE_ATTR(led3, 0666, x210_led_read, x210_led_write);
static DEVICE_ATTR(led4, 0666, x210_led_read, x210_led_write);
static struct attribute * x210_led_sysfs_entries[] = {
&dev_attr_led1.attr,//绑定到文件中
&dev_attr_led2.attr, //参考
&dev_attr_led3.attr,
&dev_attr_led4.attr,
NULL,
};
static struct attribute_group x210_led_attr_group = {
.name = NULL,
.attrs = x210_led_sysfs_entries,
};
static int x210_led_probe(struct platform_device *pdev)
{
__x210_led_probe();
return sysfs_create_group(&pdev->dev.kobj, &x210_led_attr_group);
//把device ljj-x210-led 和led1,led2,led3绑定起来
//会在/sys/devices/platform/ljj-x210-led/ 下创建这几个文件
}
static int x210_led_remove(struct platform_device *pdev)
{
__x210_led_remove();
sysfs_remove_group(&pdev->dev.kobj, &x210_led_attr_group);//删除led那几个文件
return 0;
}
static int x210_led_suspend(struct platform_device *pdev, pm_message_t state)
{
return 0;
}
static int x210_led_resume(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver x210_led_driver = {//驱动结构体
.probe = x210_led_probe,
.remove = x210_led_remove,
.suspend = x210_led_suspend,
.resume = x210_led_resume,
.driver = {
.name = "ljj-x210-led",
},
};
static struct platform_device x210_led_device = {//设备结构体
.name = "ljj-x210-led",
.id = -1,
};
static int __devinit x210_led_init(void)
{
int ret;
printk("x210 led driver\r\n");
ret = platform_device_register(&x210_led_device);//注册设备
if(ret)
printk("failed to register x210 led device\n");
ret = platform_driver_register(&x210_led_driver);//注册驱动
if(ret)
printk("failed to register x210 led driver\n");
return ret;
}
static void x210_led_exit(void)
{
platform_driver_unregister(&x210_led_driver);//注销设备
platform_device_unregister(&x210_led_device);//注销驱动
}
module_init(x210_led_init);
module_exit(x210_led_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("jianjun jiang <jerryjianjun@gmail.com>");
MODULE_DESCRIPTION("x210 led driver");
[root@liu driver_test]# cd /sys/bus/platform/devices/
[root@liu devices]# ls
ljj-x210-led //其他省略
[root@liu devices]# cd ljj-x210-led/
[root@liu ljj-x210-led]# ls
driver led2 led4 power uevent
led1 led3 modalias subsystem
[root@liu ljj-x210-led]# ls -l led*
-rw-rw-rw- 1 root 0 4096 Jan 1 12:01 led1
-rw-rw-rw- 1 root 0 4096 Jan 1 12:01 led2
-rw-rw-rw- 1 root 0 4096 Jan 1 12:01 led3
-rw-rw-rw- 1 root 0 4096 Jan 1 12:01 led4
[root@liu ljj-x210-led]# cat led1
0
