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- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/cdev.h>
- #include <linux/fs.h>
- #include <linux/errno.h>
- #include <asm/current.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/device.h>
- #include <linux/err.h>
- //#include <stdint.h>
- #include "gpio.h"
- #include "./../../stm32f429xx.h"
- #include "asm/uaccess.h"
- static int major = 100;
- static int minor = 0;
- static dev_t devno;
- static struct cdev *gpio_cdev = NULL;
- static int count = 3;
- #define DEVNAME "gpio"
- static int gpio_open(struct inode *inode, struct file *filep);
- static int gpio_close(struct inode *inode, struct file *filep);
- static ssize_t gpio_read(struct file *filep, char __user *buf, size_t size, loff_t *offset);
- static ssize_t gpio_write(struct file *filep, const char __user *buf, size_t size, loff_t *offset);
- static int gpio_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg);
- static struct file_operations gpio_ops =
- {
- .owner = THIS_MODULE,
- .open = gpio_open,
- .release = gpio_close,
- .ioctl = gpio_ioctl,
- .read = gpio_read,
- .write = gpio_write,
-
- };
- static int gpio_open(struct inode *inode, struct file *filep)
- {
- return 0;
- }
- static int gpio_close(struct inode *inode, struct file *filep)
- {
- return 0;
- }
- static int enable_gpio_clock(gpio_data_t *gpin_data)
- {
- RCC_TypeDef *rcc_dev = RCC;
-
- switch((int)gpin_data->port)
- {
- //AHB1
- case (int)GPIOA: rcc_dev->AHB1ENR |= 0x001; break;
- case (int)GPIOB: rcc_dev->AHB1ENR |= 0x002; break;
- case (int)GPIOC: rcc_dev->AHB1ENR |= 0x004; break;
- case (int)GPIOD: rcc_dev->AHB1ENR |= 0x008; break;
- case (int)GPIOE: rcc_dev->AHB1ENR |= 0x010; break;
- case (int)GPIOF: rcc_dev->AHB1ENR |= 0x020; break;
- case (int)GPIOG: rcc_dev->AHB1ENR |= 0x040; break;
- case (int)GPIOH: rcc_dev->AHB1ENR |= 0x080; break;
- case (int)GPIOI: rcc_dev->AHB1ENR |= 0x100; break;
- case (int)GPIOJ: rcc_dev->AHB1ENR |= 0x200; break;
- case (int)GPIOK: rcc_dev->AHB1ENR |= 0x400; break;
- default: printk("---> invalid gpio port!\n");break;
- }
- return 0;
- }
- static int gpio_ioctl(struct inode *inode, struct file *filep, unsigned int cmd, unsigned long arg)
- {
- uint8_t position;
- gpio_data_t gpin_data;
- GPIO_TypeDef *gpio_dev;
- if ( copy_from_user(&gpin_data, (void*)arg, sizeof(gpio_data_t)) )
- return -EFAULT;
- gpio_dev = (GPIO_TypeDef*)gpin_data.port;
- //get gpio pin position
- for(position=0;position<16;position++)
- {
- if(gpin_data.pin == 0x01<<position)
- break;
- }
-
- switch(cmd)
- {
- case SET_GPIO_INPUT:
- enable_gpio_clock(&gpin_data);
- gpio_dev->MODER &= ~((0x03) << (position<<1));
- break;
- case SET_GPIO_PUSH_PULL_OUTPUT:
- enable_gpio_clock(&gpin_data);
- gpio_dev->MODER &= ~((0x03) << (position<<1));
- gpio_dev->MODER |= ((0x01) << (position<<1));
- gpio_dev->OTYPER &= (~gpin_data.pin);
- break;
- case SET_GPIO_OPEN_DRAIN_OUTPUT:
- enable_gpio_clock(&gpin_data);
- gpio_dev->MODER &= ~((0x03) << (position<<1));
- gpio_dev->MODER |= ((0x01) << (position<<1));
- gpio_dev->OTYPER |= gpin_data.pin;
- break;
- case SET_GPIO_PULL_UP:
- gpio_dev->PUPDR &= ~((0x03) << (position<<1));
- gpio_dev->PUPDR |= ((0x01) << (position<<1));
- break;
- case SET_GPIO_PULL_DOWN:
- gpio_dev->PUPDR &= ~((0x03) << (position<<1));
- gpio_dev->PUPDR |= ((0x02) << (position<<1));
- break;
- case SET_GPIO_NO_PULL:
- gpio_dev->PUPDR &= ~((0x03) << (position<<1));
- break;
- case SET_GPIO_SPEED:
- switch(gpin_data.data)
- {
- case GPIO_LOW_SPEED:
- gpio_dev->OSPEEDR &= ~((0x03) << (position<<1));
- break;
- case GPIO_MEDIUM_SPEED:
- gpio_dev->OSPEEDR &= ~((0x03) << (position<<1));
- gpio_dev->OSPEEDR |= ((0x01) << (position<<1));
- break;
- case GPIO_FAST_SPEED:
- gpio_dev->OSPEEDR &= ~((0x03) << (position<<1));
- gpio_dev->OSPEEDR |= ((0x02) << (position<<1));
- break;
- case GPIO_HIGH_SPEED:
- gpio_dev->OSPEEDR |= ((0x03) << (position<<1));
- break;
- default:break;
- }
- break;
- case SET_GPIO_VALUE:
- if(gpin_data.data)
- gpio_dev->ODR |= gpin_data.pin;
- else
- gpio_dev->ODR &= ~gpin_data.pin;
- break;
- case GET_GPIO_VALUE:
- if(gpio_dev->IDR & gpin_data.pin)
- gpin_data.data = 0x01;
- else
- gpin_data.data = 0x00;
- break;
- default:
- printk("---> Invalid action\n");
- return -EINVAL;
- break;
- }
- return 0;
- }
- static ssize_t gpio_read(struct file *filep, char __user *buf, size_t size, loff_t *offset)
- {
- return 0;
- }
- static ssize_t gpio_write(struct file *filep, const char __user *buf, size_t size, loff_t *offset)
- {
- return 0;
- }
- static int __init gpio_init(void)
- {
- int ret;
- gpio_cdev = cdev_alloc();
- if(gpio_cdev == NULL){
- return -ENOMEM;
- }
- cdev_init(gpio_cdev,&gpio_ops);
- devno = MKDEV(major,minor);
- ret = register_chrdev_region(devno, count, DEVNAME);
- if(ret){
- goto ERR_STEP;
- }
-
- ret = cdev_add(gpio_cdev, devno, count);
- if(ret){
- goto ERR_STEP1;
- }
- return 0;
- ERR_STEP1:
- unregister_chrdev_region(devno,count);
- ERR_STEP:
- cdev_del(gpio_cdev);
- return ret;
- }
- static void __exit gpio_exit(void)
- {
- unregister_chrdev_region(MKDEV(major,minor),count);
- cdev_del(gpio_cdev);
- }
- module_init(gpio_init);
- module_exit(gpio_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jimbo");
- MODULE_DESCRIPTION("this is gpio module");
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