新路程------hi3516a标准简单版i2c设备驱动

设备驱动如下：

#include <linux/kernel.h>#include <linux/version.h>#include <linux/module.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/fcntl.h>#include <linux/mm.h>#include <linux/proc_fs.h>#include <linux/fs.h>#include <linux/slab.h>//#include <linux/smp_lock.h>#include <linux/init.h>#include <asm/uaccess.h>#include <asm/io.h>//#include <asm/system.h>#ifndef CONFIG_HISI_SNAPSHOT_BOOT#include <linux/miscdevice.h>#endif#include <linux/delay.h>#include <linux/proc_fs.h>#include <linux/poll.h>#include <asm/bitops.h>#include <asm/uaccess.h>#include <asm/irq.h>#include <linux/moduleparam.h>#include <linux/ioport.h>#include <linux/interrupt.h>#include <linux/reboot.h>#include <linux/notifier.h>#include <linux/i2c.h>#include <linux/i2c-dev.h>#include "tlv320aic31.h"#define CHIP_NUM 1#define DEV_NAME "tlv320aic31"static struct i2c_board_info hi_info ={    I2C_BOARD_INFO("adv7180", 0x40),};static struct i2c_client* tlv_client;int tlv320aic31_write(unsigned char chip_addr, unsigned char reg_addr, unsigned char value){    int ret;    unsigned char buf[2];    struct i2c_client* client = tlv_client;   printk("matt-tlv320aic31_write\n");    buf[0] = reg_addr;    buf[1] = value;    ret = i2c_master_send(client, buf, 2);    return ret;}EXPORT_SYMBOL(tlv320aic31_write);/*struct i2c_client* matt_getclient(void){  struct i2c_client* client = tlv_client;  return client;}EXPORT_SYMBOL(matt_getclient);*/int tlv320aic31_read(unsigned char chip_addr,  char reg_addr){    int ret; char *tmp;    tmp=&reg_addr;   // unsigned char buf[2];    struct i2c_client* client = tlv_client;    //ret = i2c_master_send(client, &addr, 1);//buf[0]=addr;        //buf[1]=addr;     //  printk("matt-ret=%d,val=%x\n",ret,*val);   printk("matt-ret=%d,val=%x\n",ret,*tmp);ret = i2c_master_recv(client, tmp, 1);    printk("matt-ret1=%d,val=%x\n",ret,*tmp);        return ret;}EXPORT_SYMBOL(tlv320aic31_read);/*void  adv7180_Reset(){writel(0x00000000, IO_ADDRESS(0x200f00f4));writel(0x00000008, IO_ADDRESS(0x201f0400));writel(0x00000000, IO_ADDRESS(0x201f0020));msleep(10);writel(0x000000FF, IO_ADDRESS(0x201f0020));}*/static int __init tlv320aic31_init(void){  struct i2c_adapter* i2c_adap=NULL; int temp = 0;  u8 val1=0;   printk("matt-tlv320aic31_init+1\n");   //adv7180_Reset();       // use i2c2    i2c_adap = i2c_get_adapter(2);    tlv_client = i2c_new_device(i2c_adap, &hi_info);    i2c_put_adapter(i2c_adap);    temp = tlv320aic31_write(0x40, 0x00,0x03);printk("matt-temp=%x\n",temp);  temp = tlv320aic31_read(0x40, 0x00);         printk("matt-temp1=%x\n",temp);    return 0;}static void __exit tlv320aic31_exit(void){i2c_unregister_device(tlv_client);    printk("rmmod tlv320aic31.ko for Hi3516A ok!\n");}module_init(tlv320aic31_init);module_exit(tlv320aic31_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("Hisilicon");

这是最简单版本