参照以下网址，在驱动中增加了compatible属性，两个i2C设备完全相同，只有地址不同reg<24>和<21>
编译成功后，无法分别控制这两个设备，请教一下是哪里有部队的地方么？
https://bbs.csdn.net/topics/390847077
驱动编码如下
#define PCA95535_CNT 1
#define NUM_OF_DEVICES 2
#define PCA95535_NAME "pca95535"
/*
* two devices pca95535dev[0] and pca95535dev[1]
*/
struct pca95535_dev {
char name[20];
dev_t devid; /* device ID*/
struct cdev cdev; /* cdev */
struct device *device; /* device */
int major; /* major ID */
void *private_data; /* private data */
}pca95535dev[NUM_OF_DEVICES];
struct class *pca95535_class; /* class */
static int pca95535_probe(struct i2c_client *client)
{
/* create ID */
pca95535dev[0].major = 0;
pca95535dev[1].major = 0;
int i;
for(i = 0;i < NUM_OF_DEVICES;i++){
sprintf(pca95535dev[i].name,"%s%d",PCA95535_NAME,i);
if(pca95535dev[i].major){
pca95535dev[i].devid = MKDEV(pca95535dev[i].major, 0);
register_chrdev_region(pca95535dev[i].devid, PCA95535_CNT,pca95535dev[i].name);
}else{
alloc_chrdev_region(&pca95535dev[i].devid, 0, PCA95535_CNT,pca95535dev[i].name);
pca95535dev[i].major = MAJOR(pca95535dev[i].devid);
}
}
/* creat and register cdev */
for(i = 0;i<NUM_OF_DEVICES;i++){
cdev_init(&pca95535dev[i].cdev,&pca95535_ops);
cdev_add(&pca95535dev[i].cdev,pca95535dev[i].devid,PCA95535_CNT);
}
/* create class in /sys/class */
pca95535_class = class_create(THIS_MODULE,PCA95535_NAME);
if(IS_ERR(pca95535_class)){
return PTR_ERR(pca95535_class);
}
for(i = 0;i<NUM_OF_DEVICES;i++){
/* create device */
pca95535dev[i].device = device_create(pca95535_class,NULL,pca95535dev[i].devid,
NULL,"%s%d", PCA95535_NAME,i);
if(IS_ERR(pca95535dev[i].device)){
return PTR_ERR(pca95535dev[i].device);
}
printk("pca95535 driver setup success!\r\n");
pca95535dev[i].private_data = client;
}
return 0;
}
/*
@description :i2cdriver remove function ,when remove this driver would
be executed
@input-param :i2c device
@return :0,success;other failed
*/
static int pca95535_remove(struct i2c_client *client)
{
/* delete device */
int i ;
for(i = 0;i<NUM_OF_DEVICES;i++){
cdev_del(&pca95535dev[i].cdev);
unregister_chrdev_region(pca95535dev[i].devid,PCA95535_CNT);
/* unregister class and device */
device_destroy(pca95535_class,pca95535dev[i].devid);
}
class_destroy(pca95535_class);
return 0;
}
/* tranditional compatible table */
static const struct i2c_device_id pca95535_id[] = {
{"ti,pca95535",0},
{"ti,pca95535u39",1},
{ }
};
/* device-tree compatible list*/
static const struct of_device_id pca95535_of_match[] = {
{.compatible = "ti,pca95535"},
{.compatible = "ti,pca95535u39"},
{}
};
MODULE_DEVICE_TABLE(of, pca95535_of_match);
/* i2c driver struct */
static struct i2c_driver pca95535_driver = {
.probe = pca95535_probe,
.remove = pca95535_remove,
.driver = {
.owner = THIS_MODULE,
.name = "pca95535",
.of_match_table = pca95535_of_match,
},
.id_table = pca95535_id,
};
/*
@description :driver init function
@param ：no
@return ：no
*/
static int __init pca95535_init(void)
{
int ret;
ret = i2c_add_driver(&pca95535_driver);
if(ret < 0 ){
printk("i2c device add failed\r\n");
}
return ret;
}
/*
@description : driver exit function
*/
static void __exit pca95535_exit(void)
{
printk("pca95535 unregister!\r\n");
i2c_del_driver(&pca95535_driver);
}
module_init(pca95535_init );
module_exit(pca95535_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("shyley");
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