qt2160_read
id = qt2160_read(client, QT2160_CMD_CHIPID);
ver = qt2160_read(client, QT2160_CMD_CODEVER);
rev = qt2160_read(client, QT2160_CMD_SUBVER);
static int qt2160_read(struct i2c_client *client, u8 reg);
drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);