110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <asm/io.h> //含有ioremap函数iounmap函数
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#include <asm/uaccess.h> //含有copy_from_user函数和含有copy_to_user函数
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#include <linux/device.h> //含有类相关的设备函数
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#include <linux/cdev.h>
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#include <linux/platform_device.h> //包含platform函数
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#include <linux/of.h> //包含设备树相关函数
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#include <linux/spi/spi.h>
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#include <linux/kobject.h> //包含sysfs文件系统对象类
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#include <linux/sysfs.h> //包含sysfs操作文件函数
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#include <linux/gpio/consumer.h> //包含gpio子系统接口
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/gpio.h> //包含gpio一些宏
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static struct kobject *led_kobj; //定义一个led_kobj
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struct gpio_desc *led_pin; //gpio资源
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static ssize_t led_show(struct kobject* kobjs,struct kobj_attribute *attr,char *buf)
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{
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return sprintf(buf,"led status=%d\n",gpiod_get_value(led_pin));
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}
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static ssize_t led_store(struct kobject *kobj, struct kobj_attribute *attr,const char *buf, size_t count)
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{
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if(0 == memcmp(buf,"on",2))
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{
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gpiod_set_value(led_pin,0);
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}
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else if(0 == memcmp(buf,"off",3))
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{
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gpiod_set_value(led_pin,1);
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}
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else
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{
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printk(KERN_INFO "Not support cmd\n");
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}
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return count;
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}
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static struct kobj_attribute led_attr = __ATTR(led_dev,0660,led_show,led_store);
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static int led_probe(struct platform_device *pdev)
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{
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int ret;
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led_kobj = kobject_create_and_add("sys_led",NULL);
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if(led_kobj == NULL)
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{
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printk(KERN_INFO"create led_kobj failed!\n");
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return -1;
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}
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ret = sysfs_create_file(led_kobj,&led_attr.attr);
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if(ret != 0)
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{
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printk(KERN_INFO"create w25q128_dev file failed!\n");
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return -1;
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}
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led_pin = devm_gpiod_get(&pdev->dev,"led",GPIOF_OUT_INIT_LOW);
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if(IS_ERR(led_pin))
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{
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printk(KERN_ERR"Get gpio resource failed!\n");
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return -1;
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}
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gpiod_direction_output(led_pin,0);
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return 0;
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}
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static int led_remove(struct platform_device *pdev)
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{
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sysfs_remove_file(led_kobj, &led_attr.attr); //删除属性
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kobject_put(led_kobj); //删除对象
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devm_gpiod_put(&pdev->dev,led_pin);
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printk(KERN_INFO "exit sysfs sys_led!\n");
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return 0;
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}
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static struct of_device_id led_match_table[] = {
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{.compatible = "test,led_subsys",},
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};
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static struct platform_device_id led_ids[] = {
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{.name = "led_subsys",},
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};
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static struct platform_driver led_cdev = {
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.driver = {
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.name = "led_subsys",
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.owner = THIS_MODULE,
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.of_match_table = led_match_table,
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},
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.probe = led_probe,
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.remove = led_remove,
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.id_table = led_ids,
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};
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module_platform_driver(led_cdev);
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MODULE_LICENSE("GPL"); //不加的话加载会有错误提醒
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MODULE_AUTHOR("1477153217@qq.com"); //作者
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MODULE_VERSION("0.1"); //版本
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MODULE_DESCRIPTION("led_cdev"); //简单的描述
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