gistfile1.c

static int mma8451_change_mode(struct i2c_client *client, int mode)
{
	int result;
	u8 tmp_data = 0;

	mma_status.ctl_reg1 = 0;
	result = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1, 0);
	if (result < 0)
		goto out;

	//open-drain selection on interrupt pad
	tmp_data = 0x01;
	result = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG3,tmp_data);
	if (result < 0)
		goto out;

	mma_status.mode = mode;
	result = i2c_smbus_write_byte_data(client, MMA8451_XYZ_DATA_CFG,
					   mma_status.mode);
	if (result < 0)
		goto out;

	mma_status.ctl_reg1 |= 0x01;
	result = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
					   mma_status.ctl_reg1);
	if (result < 0)
		goto out;
	mdelay(MODE_CHANGE_DELAY_MS);

	return 0;
out:
	dev_err(&client->dev, "error when init mma8451:(%d)", result);
	return result;
}