/* $NetBSD: tvpll.c,v 1.8 2019/12/23 15:25:08 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: tvpll.c,v 1.8 2019/12/23 15:25:08 thorpej Exp $");

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

#include <dev/dtv/dtvio.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/tvpllvar.h>

struct tvpll {
       device_t                parent;
       i2c_tag_t               tag;
       i2c_addr_t              addr;
       const struct tvpll_data *       pll;
       uint32_t                frequency;
};

static uint32_t tvpll_algo(struct tvpll *, uint8_t *,
               const struct dvb_frontend_parameters *, uint32_t *);

struct tvpll *
tvpll_open(device_t parent, i2c_tag_t t, i2c_addr_t a, struct tvpll_data *p)
{
       struct tvpll *tvpll;

       tvpll = kmem_alloc(sizeof(struct tvpll), KM_SLEEP);
       tvpll->tag = t;
       tvpll->addr = a;

       tvpll->pll = p;

       if (tvpll->pll->initdata) {
               iic_acquire_bus(tvpll->tag, 0);
               (void)iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr,
                   &tvpll->pll->initdata[1], tvpll->pll->initdata[0],
                   NULL, 0, 0);
               iic_release_bus(tvpll->tag, 0);
       }

       device_printf(parent, "tvpll: %s\n", tvpll->pll->name);

       return tvpll;
}

void
tvpll_close(struct tvpll *tvpll)
{
       kmem_free(tvpll, sizeof(*tvpll));
}

static uint32_t
tvpll_algo(struct tvpll *tvpll, uint8_t *b,
   const struct dvb_frontend_parameters *p, uint32_t *fr)
{
       const struct tvpll_data *pll;
       uint32_t d;
       int i;

       pll = tvpll->pll;

       if(p->frequency != 0 &&
           (p->frequency < pll->min || p->frequency > pll->max))
               return 0;

       for(i = 0; i < pll->count; i++) {
               if (p->frequency > pll->entries[i].limit)
                       continue;
               else
                       break;
       }

       if ( i >= pll->count)
               return EINVAL;

       d = (p->frequency + pll->iffreq) / pll->entries[i].stepsize;

       b[0] = (d >> 8) & 0xff;
       b[1] = (d >> 0) & 0xff;
       b[2] = pll->entries[i].config;
       b[3] = pll->entries[i].cb;
       b[4] = pll->entries[i].aux;

       *fr = (d * pll->entries[i].stepsize) - pll->iffreq;

       log(LOG_DEBUG, "pllw %d %02x %02x %02x %02x %02x\n", *fr, b[0], b[1], b[2], b[3], b[4]);
       return 0;
}

int
tvpll_tune_dtv(struct tvpll *tvpll,
   const struct dvb_frontend_parameters *params)
{
       int rv;
       uint32_t fr;
       uint8_t b[5], ab[2];

       fr = 0;

       if((rv = tvpll_algo(tvpll, b, params, &fr)) != 0)
               return rv;

       iic_acquire_bus(tvpll->tag, 0);
       /* gate ctrl? */
       if (b[4] != TVPLL_IGNORE_AUX) {
               ab[0] = b[2] | 0x18;
               ab[1] = b[4];
               rv = iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr, ab, 2, NULL, 0, 0);
       }
       rv = iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr, b, 4, NULL, 0, 0);
       iic_release_bus(tvpll->tag, 0);

       if (rv != 0)
               printf("%s\n", __func__);

       tvpll->frequency = fr;

       return rv;
}

MODULE(MODULE_CLASS_DRIVER, tvpll, "i2cexec");

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