/*
 * NXP TDA18212HN silicon tuner driver
 *
 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "tda18212.h"

/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE  64

struct tda18212_priv {
	struct tda18212_config *cfg;
	struct i2c_adapter *i2c;

	u32 if_frequency;
};

/* write multiple registers */
static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
	int len)
{
	int ret;
	u8 buf[MAX_XFER_SIZE];
	struct i2c_msg msg[1] = {
		{
			.addr = priv->cfg->i2c_address,
			.flags = 0,
			.len = 1 + len,
			.buf = buf,
		}
	};

	if (1 + len > sizeof(buf)) {
		dev_warn(&priv->i2c->dev,
			 "%s: i2c wr reg=%04x: len=%d is too big!\n",
			 KBUILD_MODNAME, reg, len);
		return -EINVAL;
	}

	buf[0] = reg;
	memcpy(&buf[1], val, len);

	ret = i2c_transfer(priv->i2c, msg, 1);
	if (ret == 1) {
		ret = 0;
	} else {
		dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
				"len=%d\n", KBUILD_MODNAME, ret, reg, len);
		ret = -EREMOTEIO;
	}
	return ret;
}

/* read multiple registers */
static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
	int len)
{
	int ret;
	u8 buf[MAX_XFER_SIZE];
	struct i2c_msg msg[2] = {
		{
			.addr = priv->cfg->i2c_address,
			.flags = 0,
			.len = 1,
			.buf = &reg,
		}, {
			.addr = priv->cfg->i2c_address,
			.flags = I2C_M_RD,
			.len = len,
			.buf = buf,
		}
	};

	if (len > sizeof(buf)) {
		dev_warn(&priv->i2c->dev,
			 "%s: i2c rd reg=%04x: len=%d is too big!\n",
			 KBUILD_MODNAME, reg, len);
		return -EINVAL;
	}

	ret = i2c_transfer(priv->i2c, msg, 2);
	if (ret == 2) {
		memcpy(val, buf, len);
		ret = 0;
	} else {
		dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
				"len=%d\n", KBUILD_MODNAME, ret, reg, len);
		ret = -EREMOTEIO;
	}

	return ret;
}

/* write single register */
static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
{
	return tda18212_wr_regs(priv, reg, &val, 1);
}

/* read single register */
static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
{
	return tda18212_rd_regs(priv, reg, val, 1);
}

#if 0 /* keep, useful when developing driver */
static void tda18212_dump_regs(struct tda18212_priv *priv)
{
	int i;
	u8 buf[256];

	#define TDA18212_RD_LEN 32
	for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
		tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);

	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
		sizeof(buf), true);

	return;
}
#endif

static int tda18212_set_params(struct dvb_frontend *fe)
{
	struct tda18212_priv *priv = fe->tuner_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	int ret, i;
	u32 if_khz;
	u8 buf[9];
	#define DVBT_6   0
	#define DVBT_7   1
	#define DVBT_8   2
	#define DVBT2_6  3
	#define DVBT2_7  4
	#define DVBT2_8  5
	#define DVBC_6   6
	#define DVBC_8   7
	static const u8 bw_params[][3] = {
		     /* reg:   0f    13    23 */
		[DVBT_6]  = { 0xb3, 0x20, 0x03 },
		[DVBT_7]  = { 0xb3, 0x31, 0x01 },
		[DVBT_8]  = { 0xb3, 0x22, 0x01 },
		[DVBT2_6] = { 0xbc, 0x20, 0x03 },
		[DVBT2_7] = { 0xbc, 0x72, 0x03 },
		[DVBT2_8] = { 0xbc, 0x22, 0x01 },
		[DVBC_6]  = { 0x92, 0x50, 0x03 },
		[DVBC_8]  = { 0x92, 0x53, 0x03 },
	};

	dev_dbg(&priv->i2c->dev,
			"%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n",
			__func__, c->delivery_system, c->frequency,
			c->bandwidth_hz);

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

	switch (c->delivery_system) {
	case SYS_DVBT:
		switch (c->bandwidth_hz) {
		case 6000000:
			if_khz = priv->cfg->if_dvbt_6;
			i = DVBT_6;
			break;
		case 7000000:
			if_khz = priv->cfg->if_dvbt_7;
			i = DVBT_7;
			break;
		case 8000000:
			if_khz = priv->cfg->if_dvbt_8;
			i = DVBT_8;
			break;
		default:
			ret = -EINVAL;
			goto error;
		}
		break;
	case SYS_DVBT2:
		switch (c->bandwidth_hz) {
		case 6000000:
			if_khz = priv->cfg->if_dvbt2_6;
			i = DVBT2_6;
			break;
		case 7000000:
			if_khz = priv->cfg->if_dvbt2_7;
			i = DVBT2_7;
			break;
		case 8000000:
			if_khz = priv->cfg->if_dvbt2_8;
			i = DVBT2_8;
			break;
		default:
			ret = -EINVAL;
			goto error;
		}
		break;
	case SYS_DVBC_ANNEX_A:
	case SYS_DVBC_ANNEX_C:
		if_khz = priv->cfg->if_dvbc;
		i = DVBC_8;
		break;
	default:
		ret = -EINVAL;
		goto error;
	}

	ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
	if (ret)
		goto error;

	ret = tda18212_wr_reg(priv, 0x06, 0x00);
	if (ret)
		goto error;

	ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
	if (ret)
		goto error;

	buf[0] = 0x02;
	buf[1] = bw_params[i][1];
	buf[2] = 0x03; /* default value */
	buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
	buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
	buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
	buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
	buf[7] = 0xc1;
	buf[8] = 0x01;
	ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
	if (ret)
		goto error;

	/* actual IF rounded as it is on register */
	priv->if_frequency = buf[3] * 50 * 1000;

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

	return ret;

error:
	dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
	goto exit;
}

static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct tda18212_priv *priv = fe->tuner_priv;

	*frequency = priv->if_frequency;

	return 0;
}

static int tda18212_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
	return 0;
}

static const struct dvb_tuner_ops tda18212_tuner_ops = {
	.info = {
		.name           = "NXP TDA18212",

		.frequency_min  =  48000000,
		.frequency_max  = 864000000,
		.frequency_step =      1000,
	},

	.release       = tda18212_release,

	.set_params    = tda18212_set_params,
	.get_if_frequency = tda18212_get_if_frequency,
};

struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
	struct i2c_adapter *i2c, struct tda18212_config *cfg)
{
	struct tda18212_priv *priv = NULL;
	int ret;
	u8 val;

	priv = kzalloc(sizeof(struct tda18212_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 = tda18212_rd_reg(priv, 0x00, &val);

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

	if (!ret)
		dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
	if (ret || val != 0xc7) {
		kfree(priv);
		return NULL;
	}

	dev_info(&priv->i2c->dev,
			"%s: NXP TDA18212HN successfully identified\n",
			KBUILD_MODNAME);

	memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
		sizeof(struct dvb_tuner_ops));

	return fe;
}
EXPORT_SYMBOL(tda18212_attach);

MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");