sdm450 安卓9 平台内写出一个cci设备驱动及其读写操作
时间: 2024-03-30 15:37:08 浏览: 22
CCI(Camera Control Interface)设备驱动是相机的硬件接口之一,用于控制相机的各项参数。以下是在安卓9平台内编写CCI设备驱动及其读写操作的示例代码:
1. 定义CCI设备结构体
```c
struct cci_device {
struct i2c_client *client;
struct mutex lock;
};
```
2. 实现CCI设备的读写操作函数
```c
static int cci_write_reg(struct cci_device *cci, u16 reg, u8 value)
{
int ret;
u8 buf[2];
struct i2c_msg msgs[] = {
{
.addr = cci->client->addr,
.flags = 0,
.len = 2,
.buf = buf,
},
};
mutex_lock(&cci->lock);
buf[0] = reg >> 8;
buf[1] = reg & 0xff;
ret = i2c_transfer(cci->client->adapter, msgs, 1);
if (ret < 0)
goto exit;
buf[0] = value;
ret = i2c_transfer(cci->client->adapter, msgs, 1);
if (ret < 0)
goto exit;
exit:
mutex_unlock(&cci->lock);
return ret;
}
static int cci_read_reg(struct cci_device *cci, u16 reg, u8 *value)
{
int ret;
u8 buf[2];
struct i2c_msg msgs[] = {
{
.addr = cci->client->addr,
.flags = 0,
.len = 2,
.buf = buf,
},
{
.addr = cci->client->addr,
.flags = I2C_M_RD,
.len = 1,
.buf = value,
},
};
mutex_lock(&cci->lock);
buf[0] = reg >> 8;
buf[1] = reg & 0xff;
ret = i2c_transfer(cci->client->adapter, msgs, 2);
if (ret < 0)
goto exit;
exit:
mutex_unlock(&cci->lock);
return ret;
}
```
3. 注册CCI设备
```c
static int cci_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct cci_device *cci;
cci = devm_kzalloc(&client->dev, sizeof(*cci), GFP_KERNEL);
if (!cci)
return -ENOMEM;
cci->client = client;
mutex_init(&cci->lock);
i2c_set_clientdata(client, cci);
// 注册CCI设备
// ...
return 0;
}
static int cci_remove(struct i2c_client *client)
{
// 注销CCI设备
// ...
return 0;
}
static const struct i2c_device_id cci_id[] = {
{ "cci", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, cci_id);
static const struct of_device_id cci_of_match[] = {
{ .compatible = "cci", },
{ },
};
MODULE_DEVICE_TABLE(of, cci_of_match);
static struct i2c_driver cci_driver = {
.probe = cci_probe,
.remove = cci_remove,
.id_table = cci_id,
.driver = {
.name = "cci",
.of_match_table = cci_of_match,
},
};
```
上面的代码中,需要根据实际情况实现CCI设备的注册和注销函数。在注册函数中,需要调用i2c_add_driver函数注册CCI设备驱动。在注销函数中,需要调用i2c_del_driver函数注销CCI设备驱动。
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