简单的IIC驱动实例

最新推荐文章于 2023-09-12 17:46:41 发布

年少轻狂

最新推荐文章于 2023-09-12 17:46:41 发布

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CC 4.0 BY-SA版权

分类专栏：驱动历程文章标签： struct c file module input byte

本文链接：https://blog.youkuaiyun.com/huang879135/article/details/6604118

这个博客介绍了如何为S3C2410微处理器编写一个简单的I2C驱动程序，包括中断处理、读写操作以及设备注册。驱动程序包含了I2C中断处理函数`iic_int_24c04`，读取和写入函数`iic_read_24c040`和`iic_write_24c040`，并展示了如何设置I2C的相关寄存器。此外，还给出了一个测试程序来验证驱动功能。

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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <linux/sched.h>

#include <asm/hardware.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <linux/kernel.h>   /* printk() */
#include <linux/slab.h>   /* kmalloc() */
#include <linux/fs.h>       /* everything... */
#include <linux/errno.h>    /* error codes */
#include <linux/types.h>    /* size_t */
#include <linux/mm.h>
#include <linux/kdev_t.h>
#include <linux/cdev.h>
#include <linux/delay.h>
//#include <linux/device.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <asm/irq.h>
//#include <asm/arch/regs-adc.h>

#include <asm/arch/map.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-irq.h>
#include <asm/arch/regs-clock.h>
//#include <asm/arch/regs-iic.h>

volatile int f_nGetACK;
#define UINT unsigned int

#define I2C_MAGIC 'k'
#define I2C_set _IO(I2C_MAGIC,1)

#define I2C_MAJOR 259
#define DEVICE_NAME "s3c2410_I2C"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("farsight");
MODULE_DESCRIPTION("s3c2410 I2C");

char data[128]="\0";

#define rGPECON *(volatile unsigned int *)S3C2410_GPECON

#if 0
#define S3C2410_I2C(x) (S3C2410_IICREG(x))

#define S3C2410_IICCON    S3C2410_I2C(0x00)
#define S3C2410_IICSTAT    S3C2410_I2C(0x04)
#define S3C2410_IICADD    S3C2410_I2C(0x08)
#define S3C2410_IICDS    S3C2410_I2C(0x0c)

#define rIICCON *(volatile unsigned int *)S3C2410_IICCON
#define rIICSTAT *(volatile unsigned int *)S3C2410_IICSTAT
#define rIICADD *(volatile unsigned int *)S3C2410_IICADD
#define rIICDS *(volatile unsigned int *)S3C2410_IICDS
#define rGPECON *(volatile unsigned int *)S3C2410_GPECON
#else

#define rIICCON *(volatile unsigned int *)i2c_base
#define rIICSTAT *(volatile unsigned int *)((unsigned int)i2c_base + 4)
#define rIICADD *(volatile unsigned int *)((unsigned int)i2c_base + 8)
#define rIICDS *(volatile unsigned int *)((unsigned int)i2c_base + 0xc)?/IICDS寄存器

static volatile void __iomem *i2c_base;
static struct resource