/*
	Mantis VP-2040 driver

	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>

#include <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/dvb_net.h>

#include "tda1002x.h"
#include "mantis_common.h"
#include "mantis_ioc.h"
#include "mantis_dvb.h"
#include "mantis_vp2040.h"

#define MANTIS_MODEL_NAME	"VP-2040"
#define MANTIS_DEV_TYPE		"DVB-C"

static struct tda1002x_config vp2040_tda1002x_cu1216_config = {
	.demod_address	= 0x18 >> 1,
	.invert		= 1,
};

static struct tda10023_config vp2040_tda10023_cu1216_config = {
	.demod_address	= 0x18 >> 1,
	.invert		= 1,
};

static int tda1002x_cu1216_tuner_set(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct mantis_pci *mantis	= fe->dvb->priv;
	struct i2c_adapter *adapter	= &mantis->adapter;

	u8 buf[6];
	struct i2c_msg msg = {.addr = 0x60, .flags = 0, .buf = buf, .len = sizeof(buf)};
	int i;

#define CU1216_IF 36125000
#define TUNER_MUL 62500

	u32 div = (p->frequency + CU1216_IF + TUNER_MUL / 2) / TUNER_MUL;

	buf[0] = (div >> 8) & 0x7f;
	buf[1] = div & 0xff;
	buf[2] = 0xce;
	buf[3] = (p->frequency < 150000000 ? 0x01 :
		  p->frequency < 445000000 ? 0x02 : 0x04);
	buf[4] = 0xde;
	buf[5] = 0x20;

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

	if (i2c_transfer(adapter, &msg, 1) != 1)
		return -EIO;

	/* wait for the pll lock */
	msg.flags = I2C_M_RD;
	msg.len = 1;
	for (i = 0; i < 20; i++) {
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 1);

		if (i2c_transfer(adapter, &msg, 1) == 1 && (buf[0] & 0x40))
			break;

		msleep(10);
	}

	/* switch the charge pump to the lower current */
	msg.flags = 0;
	msg.len = 2;
	msg.buf = &buf[2];
	buf[2] &= ~0x40;
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	if (i2c_transfer(adapter, &msg, 1) != 1)
		return -EIO;

	return 0;
}

static u8 read_pwm(struct mantis_pci *mantis)
{
	struct i2c_adapter *adapter = &mantis->adapter;

	u8 b = 0xff;
	u8 pwm;
	struct i2c_msg msg[] = {
		{.addr = 0x50, .flags = 0, .buf = &b, .len = 1},
		{.addr = 0x50, .flags = I2C_M_RD, .buf = &pwm, .len = 1}
	};

	if ((i2c_transfer(adapter, msg, 2) != 2)
	    || (pwm == 0xff))
		pwm = 0x48;

	return pwm;
}

static int vp2040_frontend_init(struct mantis_pci *mantis, struct dvb_frontend *fe)
{
	struct i2c_adapter *adapter = &mantis->adapter;

	int err = 0;

	err = mantis_frontend_power(mantis, POWER_ON);
	if (err == 0) {
		mantis_frontend_soft_reset(mantis);
		msleep(250);

		dprintk(MANTIS_ERROR, 1, "Probing for CU1216 (DVB-C)");
		fe = dvb_attach(tda10021_attach, &vp2040_tda1002x_cu1216_config,
				     adapter,
				     read_pwm(mantis));

		if (fe) {
			dprintk(MANTIS_ERROR, 1,
				"found Philips CU1216 DVB-C frontend (TDA10021) @ 0x%02x",
				vp2040_tda1002x_cu1216_config.demod_address);
		} else {
			fe = dvb_attach(tda10023_attach, &vp2040_tda10023_cu1216_config,
					     adapter,
					     read_pwm(mantis));

			if (fe) {
				dprintk(MANTIS_ERROR, 1,
					"found Philips CU1216 DVB-C frontend (TDA10023) @ 0x%02x",
					vp2040_tda1002x_cu1216_config.demod_address);
			}
		}

		if (fe) {
			fe->ops.tuner_ops.set_params = tda1002x_cu1216_tuner_set;
			dprintk(MANTIS_ERROR, 1, "Mantis DVB-C Philips CU1216 frontend attach success");
		} else {
			return -1;
		}
	} else {
		dprintk(MANTIS_ERROR, 1, "Frontend on <%s> POWER ON failed! <%d>",
			adapter->name,
			err);

		return -EIO;
	}
	mantis->fe = fe;
	dprintk(MANTIS_DEBUG, 1, "Done!");

	return 0;
}

struct mantis_hwconfig vp2040_config = {
	.model_name	= MANTIS_MODEL_NAME,
	.dev_type	= MANTIS_DEV_TYPE,
	.ts_size	= MANTIS_TS_204,

	.baud_rate	= MANTIS_BAUD_9600,
	.parity		= MANTIS_PARITY_NONE,
	.bytes		= 0,

	.frontend_init	= vp2040_frontend_init,
	.power		= GPIF_A12,
	.reset		= GPIF_A13,
};
