/* $NetBSD: mt2131.c,v 1.7 2019/12/23 18:57:30 thorpej Exp $ */

/*
* Copyright (c) 2008, 2011 Jonathan A. Kollasch
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mt2131.c,v 1.7 2019/12/23 18:57:30 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/module.h>

#include <dev/i2c/mt2131var.h>

#define PWR 0x07
#define UPC_1 0x0b
#define AGC_RL 0x10
#define MISC_2 0x15

#define IF1 1220
#define IF2 44000
#define REF 16000

static const uint8_t mt2131_initstring[] = {
       0x01,
       0x50, 0x00, 0x50, 0x80, 0x00, 0x49,
       0xfa, 0x88, 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
       0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80, 0xff, 0x68,
       0xa0, 0xff, 0xdd, 0x00, 0x00
};

static const uint8_t mt2131_agcinitstring[] = {
       AGC_RL,
       0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
};


struct mt2131_softc {
       device_t                parent;
       i2c_tag_t               tag;
       i2c_addr_t              addr;
       uint32_t                frequency;
       uint32_t                bandwidth;
};

static int mt2131_init(struct mt2131_softc *);

static int mt2131_read(struct mt2131_softc *, uint8_t, uint8_t *);
static int mt2131_write(struct mt2131_softc *, uint8_t, uint8_t);

struct mt2131_softc *
mt2131_open(device_t parent, i2c_tag_t t, i2c_addr_t a)
{
       struct mt2131_softc *sc;
       int ret;
       uint8_t cmd, reg;

       cmd = reg = 0;

       /* get id reg */
       ret = iic_acquire_bus(t, 0);
       if (ret == 0) {
               ret = iic_exec(t, I2C_OP_READ_WITH_STOP, a, &cmd, 1, &reg, 1,
                   0);
               iic_release_bus(t, 0);
       }

       if (ret) {
               device_printf(parent, "%s(): read fail\n", __func__);
               return NULL;
       }

       if ((reg & 0xfe) != 0x3e) {
               device_printf(parent, "%s(): chip id %02x unknown\n",
                   __func__, reg);
               return NULL;
       }

       sc = kmem_alloc(sizeof(*sc), KM_SLEEP);
       sc->parent = parent;
       sc->tag = t;
       sc->addr = a;

       mt2131_init(sc);

       return sc;
}

void
mt2131_close(struct mt2131_softc *sc)
{
       kmem_free(sc, sizeof(*sc));
}

int
mt2131_tune_dtv(struct mt2131_softc *sc, const struct dvb_frontend_parameters *p)
{
       int rv, i;
       uint64_t o1, o2;
       uint64_t d1, d2;
       uint32_t r1, r2;
       uint32_t fr;
       uint8_t b[7];
       uint8_t regval;

       mt2131_init(sc);

       b[0] = 0x01;

       if(p->frequency != 0 &&
               (p->frequency < 50000000 || p->frequency > 1000000000))
               return EINVAL;

       fr = p->frequency / 1000;

       o1 = fr + IF1 * 1000;
       o2 = o1 - fr - IF2;

       d1 = (o1 * 8192)/REF;
       d2 = (o2 * 8192)/REF;

       r1 = d1/8192;
       r2 = d2/8192;

       b[1] = (d1 & 0x1fe0) >> 5;
       b[2] = (d1 & 0x001f);
       b[3] = r1;
       b[4] = (d2 & 0x1fe0) >> 5;
       b[5] = (d2 & 0x001f);
       b[6] = r2;

       rv = iic_acquire_bus(sc->tag, 0);
       if (rv == 0) {
               rv = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr, b, 7,
                   NULL, 0, 0);
               iic_release_bus(sc->tag, 0);
       }

       regval = (fr - 27501) / 55000;

       if(regval > 0x13)
               regval = 0x13;

       rv = mt2131_write(sc, UPC_1, regval);

       if (rv != 0)
               device_printf(sc->parent, "%s write failed\n", __func__);

       sc->frequency = (o1 - o2 - IF2) * 1000;

       for (i = 0; i < 100; i++) {
               kpause("mt2131", true, 1, NULL);

               rv = mt2131_read(sc, 0x08, &regval);
               if (rv != 0)
                       device_printf(sc->parent, "%s read failed\n", __func__);

               if (( regval & 0x88 ) == 0x88 ) {
                       return 0;
               }
       }

       device_printf(sc->parent, "mt2131 not locked, %02x\n", b[1]);

       return rv;
}

static int
mt2131_init(struct mt2131_softc *sc)
{
       int ret;

       ret = iic_acquire_bus(sc->tag, 0);
       if (ret)
               return -1;
       ret = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr,
           mt2131_initstring, sizeof(mt2131_initstring), NULL, 0, 0);
       iic_release_bus(sc->tag, 0);
       if (ret)
               return -1;

       ret = mt2131_write(sc, UPC_1, 0x09);
       ret = mt2131_write(sc, MISC_2, 0x47);
       ret = mt2131_write(sc, PWR, 0xf2);
       ret = mt2131_write(sc, UPC_1, 0x01);

       ret = iic_acquire_bus(sc->tag, 0);
       if (ret)
               return -1;
       ret = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr,
           mt2131_agcinitstring, sizeof(mt2131_agcinitstring),
           NULL, 0, 0);
       iic_release_bus(sc->tag, 0);
       if (ret)
               return -1;

       return 0;
}

static int
mt2131_read(struct mt2131_softc *sc, uint8_t r, uint8_t *v)
{
       int ret;

       ret = iic_acquire_bus(sc->tag, 0);
       if (ret)
               return ret;
       ret = iic_exec(sc->tag, I2C_OP_READ_WITH_STOP, sc->addr,
           &r, 1, v, 1, 0);

       iic_release_bus(sc->tag, 0);

       return ret;
}

static int
mt2131_write(struct mt2131_softc *sc, uint8_t a, uint8_t v)
{
       int ret;
       uint8_t b[] = { a, v };

       ret = iic_acquire_bus(sc->tag, 0);
       if (ret)
               return ret;

       ret = iic_exec(sc->tag, I2C_OP_READ_WITH_STOP, sc->addr,
           b, sizeof(b), NULL, 0, 0);

       iic_release_bus(sc->tag, 0);

       return ret;
}

MODULE(MODULE_CLASS_DRIVER, mt2131, "i2cexec");

static int
mt2131_modcmd(modcmd_t cmd, void *priv)
{
       if (cmd == MODULE_CMD_INIT || cmd == MODULE_CMD_FINI)
               return 0;
       return ENOTTY;
}

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