101 lines
3.3 KiB
C
101 lines
3.3 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/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/slab.h>
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#include <linux/string.h>
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#define GPIOE_CFG0 (0x01C20890)
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#define GPIOE_CFG1 (0x01C20894)
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#define GPIOE_DATA (0x01C208A0)
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#define GPIOE_PUL0 (0x01C208AC)
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size_t *gpioe_cfg0; //存储虚拟地址到物理地址映射
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size_t *gpioe_cfg1; //存储虚拟地址到物理地址映射
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size_t *gpioe_data; //存储虚拟地址到物理地址映射
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size_t *gpioe_pul0; //存储虚拟地址到物理地址映射
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static int led_status = 0; //定义一个led状态变量
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static struct kobject *led_kobj; //定义一个led_kobj
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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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printk(KERN_INFO "Read led\n");
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return sprintf(buf,"The led_status status is = %d\n",led_status);
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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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printk(KERN_INFO "led status store\n");
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if(0 == memcmp(buf,"on",2))
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{
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*((volatile size_t*)gpioe_data) &= ~(1<<12) ;//清除GPIOE12状态
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led_status = 1;
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}
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else if(0 == memcmp(buf,"off",3))
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{
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*((volatile size_t*)gpioe_data) |= (1<<12);//设置GPIOE12状态1
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led_status = 0;
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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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//定义一个led_attr对象属性
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static struct kobj_attribute led_attr = __ATTR(led_status,0660,led_show,led_store);
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static int __init sysfs_led_init(void)
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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 sysfa file failed!\n");
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return -1;
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}
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gpioe_cfg0 = ioremap(GPIOE_CFG0,4); //将GPIOE_CFG0物理地址映射为虚拟地址
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gpioe_cfg1 = ioremap(GPIOE_CFG1,4); //将GPIOE_CFG1物理地址映射为虚拟地址
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gpioe_data = ioremap(GPIOE_DATA,4); //将GPIOE_DATA物理地址映射为虚拟地址
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gpioe_pul0 = ioremap(GPIOE_PUL0,4); //将GPIOE_PUL0物理地址映射为虚拟地址
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*((volatile size_t*)gpioe_cfg1) &= ~(7<<16); //清除配置寄存器
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*((volatile size_t*)gpioe_cfg1) |= (1<<16); //配置GPIOE12为输出模式
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*((volatile size_t*)gpioe_pul0) &= ~(3<<16); //清除上/下拉寄存器
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*((volatile size_t*)gpioe_pul0) |= (1<<12); //配置GPIOE12为上拉模式
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*((volatile size_t*)gpioe_data) &= ~(1<<12) ;//清除GPIOE12状态
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return 0;
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}
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static void __exit sysfs_led_exit(void)
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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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printk(KERN_INFO "Goodbye!\n");
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}
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module_init(sysfs_led_init);
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module_exit(sysfs_led_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("1477153217@qq.com");
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MODULE_DESCRIPTION("sysfs led");
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MODULE_VERSION("0.1");
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