/*
        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,
};