#if defined(CONFIG_MEDIA_TUNER_MXL5007T) || (defined(CONFIG_MEDIA_TUNER_MXL5007T_MODULE) && defined(MODULE))
extern struct dvb_frontend *mxl5007t_attach(struct dvb_frontend *fe,
					    struct i2c_adapter *i2c, u8 addr,
					    struct mxl5007t_config *cfg);
#else
static inline struct dvb_frontend *mxl5007t_attach(struct dvb_frontend *fe,
						   struct i2c_adapter *i2c,
						   u8 addr,
						   struct mxl5007t_config *cfg)
{
	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
	return NULL;
}
#endif

struct dvb_frontend *mxl5007t_attach(struct dvb_frontend *fe,
				     struct i2c_adapter *i2c, u8 addr,
				     struct mxl5007t_config *cfg)
{
	struct mxl5007t_state *state = NULL;
	int instance, ret;

	mutex_lock(&mxl5007t_list_mutex);
	instance = hybrid_tuner_request_state(struct mxl5007t_state, state,
					      hybrid_tuner_instance_list,
					      i2c, addr, "mxl5007t");
	switch (instance) {
	case 0:
		goto fail;
	case 1:
		/* new tuner instance */
		state->config = cfg;

		mutex_init(&state->lock);

		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 1);

		ret = mxl5007t_get_chip_id(state);

		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 0);

		/* check return value of mxl5007t_get_chip_id */
		if (mxl_fail(ret))
			goto fail;
                       
               if (fe->ops.i2c_gate_ctrl)
                       fe->ops.i2c_gate_ctrl(fe, 1);

               ret = mxl5007t_write_reg(state, 0x04, state->config->loop_thru_enable);

               if (fe->ops.i2c_gate_ctrl)
                       fe->ops.i2c_gate_ctrl(fe, 0);

               /* check return value of mxl5007t_get_chip_id */
               if (mxl_fail(ret))
                       goto fail;
		break;
	default:
		/* existing tuner instance */
		break;
	}
	fe->tuner_priv = state;
	mutex_unlock(&mxl5007t_list_mutex);

	memcpy(&fe->ops.tuner_ops, &mxl5007t_tuner_ops,
	       sizeof(struct dvb_tuner_ops));

	return fe;
fail:
	mutex_unlock(&mxl5007t_list_mutex);

	mxl5007t_release(fe);
	return NULL;
}

struct dvb_frontend *tuner_tda18218_attach(struct dvb_frontend *fe,
	struct i2c_adapter *i2c, struct tda18218_config *cfg)
{
	struct tda18218_priv *priv = NULL;
	u8 val;
	int ret;
	/* chip default registers values */
	static u8 def_regs[] = {
		0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40,
		0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00,
		0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01,
		0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9,
		0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00,
		0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6
	};

	priv = kzalloc(sizeof(struct tda18218_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	priv->cfg = cfg;
	priv->i2c = i2c;
	fe->tuner_priv = priv;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */

	/* check if the tuner is there */
	ret = tda18218_rd_reg(priv, R00_ID, &val);
	dbg("%s: ret:%d chip ID:%02x", __func__, ret, val);
	if (ret || val != def_regs[R00_ID]) {
		kfree(priv);
		return NULL;
	}

	info("NXP TDA18218HN successfully identified.");

	memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops,
		sizeof(struct dvb_tuner_ops));
	memcpy(priv->regs, def_regs, sizeof(def_regs));

	/* loop-through enabled chip default register values */
	if (priv->cfg->loop_through) {
		priv->regs[R17_PD1] = 0xb0;
		priv->regs[R18_PD2] = 0x59;
	}

	/* standby */
	ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
	if (ret)
		dbg("%s: failed ret:%d", __func__, ret);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */

	return fe;
}