linux i2c驱动控制ap3216c的代码
时间: 2023-08-24 22:05:11 浏览: 82
以下是一个简单的示例代码,展示了如何在Linux系统上编写i2c驱动程序以控制AP3216C传感器:
```c
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#define AP3216C_I2C_ADDR 0x1e
static int ap3216c_read(struct i2c_client *client, u8 reg, u8 *data, int len)
{
struct i2c_msg msgs[2] = {
{
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = ®,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = data,
},
};
return i2c_transfer(client->adapter, msgs, 2);
}
static int ap3216c_write(struct i2c_client *client, u8 reg, u8 *data, int len)
{
u8 *buf = kzalloc(len + 1, GFP_KERNEL);
int ret;
if (!buf)
return -ENOMEM;
buf[0] = reg;
memcpy(buf + 1, data, len);
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = len + 1,
.buf = buf,
};
ret = i2c_transfer(client->adapter, &msg, 1);
kfree(buf);
return ret;
}
static int ap3216c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
int ret;
u8 data[2];
ret = ap3216c_read(client, 0x00, data, 2);
if (ret < 0) {
dev_err(&client->dev, "Failed to read AP3216C chip ID\n");
return ret;
}
dev_info(&client->dev, "AP3216C chip ID: %x\n", data[1]);
/* TODO: Write initialization sequence here */
return 0;
}
static const struct i2c_device_id ap3216c_id[] = {
{ "ap3216c", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ap3216c_id);
static struct i2c_driver ap3216c_driver = {
.driver = {
.name = "ap3216c",
},
.probe = ap3216c_probe,
.id_table = ap3216c_id,
};
module_i2c_driver(ap3216c_driver);
```
这个示例代码定义了两个函数:`ap3216c_read`和`ap3216c_write`,分别用于读和写AP3216C寄存器。该驱动程序在初始化过程中会通过I2C总线读取AP3216C芯片的ID,并可以在该函数中添加其他初始化代码。
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