The MPU3050 is a three-axis gyroscope chip developed by Invensense. Its primary function is to measure angular velocity, which helps determine the motion state of an object, making it commonly referred to as a motion sensor.
The following figure shows the system block diagram of the MPU3050. The chip includes one interrupt pin that can be controlled via I2C to retrieve the xGyro, yGyro, and zGyro values.
The device driver uses the `mpu3050_sensor` structure to represent the MPU3050 device object. This object contains the I2C client and the input device for processing the transfer of x, y, and z-axis data.
```c
struct mpu3050_sensor {
struct i2c_client *client; // I2C client
struct device *dev; // Device file
struct input_dev *idev; // Input device
};
```
To store the x, y, and z-axis gyro data, the `axis_data` structure is used.
```c
struct axis_data {
s16 x; // X-axis
s16 y; // Y-axis
s16 z; // Z-axis
};
```
**First, register the I2C device.**
```c
module_i2c_driver(mpu3050_i2c_driver);
```
**Next, define the I2C driver structure.**
```c
static struct i2c_driver mpu3050_i2c_driver = {
.driver = {
.name = "mpu3050",
.owner = THIS_MODULE,
.pm = &mpu3050_pm,
.of_match_table = mpu3050_of_match,
},
.probe = mpu3050_probe, // I2C probe method
.remove = __devexit_p(mpu3050_remove),
.id_table = mpu3050_ids,
};
```
**When the I2C device matches the driver, the I2C driver must be registered in the board driver.**
On the HTConemax board, this is done as follows:
```c
static struct i2c_board_info __initdata mpu3050_GSBI12_boardinfo[] = {
{
I2C_BOARD_INFO("mpu3050", 0xD0),
.irq = PM8921_GPIO_IRQ(PM8921_IRQ_BASE, PM_GYRO_INT),
.platform_data = &mpu3050_data,
},
};
```
**Finally, call the registration function:**
```c
i2c_register_board_info(MSM8064_GSBI2_QUP_I2C_BUS_ID,
mpu3050_GSBI12_boardinfo,
ARRAY_SIZE(mpu3050_GSBI12_boardinfo));
```
This setup allows the system to correctly initialize and communicate with the MPU3050 gyroscope, enabling real-time motion sensing and data acquisition.
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