qt2160_write
qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);
error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);
qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
qt2160_write(client, QT2160_CMD_PWM_DUTY, value);