I.MX6Q GPIO驱动的编写

I.MX6Q GPIO驱动的编写

                              作者：卢浩  

                                     时间：2017.2.20

                                    转载请注明出处

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#include <linux/major.h>#include <linux/miscdevice.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/mm.h>#include <linux/fs.h>#include <linux/types.h>#include <linux/delay.h>#include <linux/moduleparam.h>#include <linux/slab.h>#include <linux/errno.h>#include <linux/ioctl.h>#include <linux/cdev.h>#include <linux/sched.h>#include <linux/string.h>#include <linux/list.h>#include <linux/pci.h>#include "linux/version.h"#include <linux/blkdev.h>#include <linux/mm.h>#include <linux/module.h> #include <linux/init.h> #include <mach/gpio.h>#include <mach/hardware.h>#include <mach/iomux-mx6q.h>#include <asm/uaccess.h>#include <asm/atomic.h>#include <asm/unistd.h>#include <asm/gpio.h>#include <asm/irq.h>/*Set the DEVICE_NAME,you can change it */#define DEVICE_NAME "GPIO_DEVICE"/*OUT level control  1:high0:lowIsn't it?You can read the reference mentual*/#define IOCTL_GPIO_HIGH1#define IOCTL_GPIO_LOW0#define NUM_5_16 IMX_GPIO_NR(5, 16)#define NUM_5_17 IMX_GPIO_NR(5, 17)//#define NUM_4_28 IMX_GPIO_NR(4, 28)//#define NUM_4_29 IMX_GPIO_NR(4, 29)//#define NUM_4_30 IMX_GPIO_NR(4, 30)static unsigned int num[] = {NUM_5_16,NUM_5_17,//NUM_4_28,//NUM_4_29,//NUM_4_30,};static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg){if (arg > 3){return -EINVAL;}switch(cmd){case IOCTL_GPIO_HIGH:gpio_set_value(num[arg], 1);return 0;case IOCTL_GPIO_LOW:gpio_set_value(num[arg], 0);return 0;default:return -EINVAL;}}static struct file_operations gpio_fops = {.owner=THIS_MODULE,.unlocked_ioctl=gpio_ioctl,//.release        = gpio_release,//.read   = gpio_read, //  .write  = gpio_write,};static struct miscdevice misc = {.minor = MISC_DYNAMIC_MINOR,.name = DEVICE_NAME,.fops = &gpio_fops,};static int __init gpio_init(void){int ret;int i;for(i = 0 ; i<2; i++){gpio_request(num[i],"fsl_gpio");gpio_direction_output(num[i],1);gpio_set_value(num[i], 0);}ret = misc_register(&misc);printk (DEVICE_NAME" initialized.\n");return ret;}static void __exit gpio_exit(void){misc_deregister(&misc);}MODULE_LICENSE("GPL");MODULE_AUTHOR("luhao");module_init(gpio_init);module_exit(gpio_exit);

                                             
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