/*      $NetBSD: tea5767.c,v 1.2 2019/12/23 20:49:09 thorpej Exp $      */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Karuna Grewal.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: tea5767.c,v 1.2 2019/12/23 20:49:09 thorpej Exp $");

#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/systm.h>

#include <dev/i2c/i2cvar.h>

#include <sys/ioctl.h>
#include <sys/radioio.h>
#include <dev/radio_if.h>

#include "tea5767reg.h"

struct tea5767_tune {
       int mute;
       uint32_t freq;
       int stereo;
       bool is_pll_set;
       bool is_xtal_set;
       bool is_force_srch;
       int fm_band;            /* Set = JAPAN. */
       int lock;
       int adc_stop_level;
};

struct tea5767_softc {
       device_t sc_dev;
       /* Tunable properties. */
       struct tea5767_tune tune;
       /* I2C bus controller. */
       i2c_tag_t sc_i2c_tag;
       /* Device addr on I2C. */
       i2c_addr_t sc_addr;
       /* Device capabilities. */
       uint32_t caps;
};

static int tea5767_get_info(void *, struct radio_info *);
static int tea5767_set_info(void *, struct radio_info *);
static int tea5767_search(void *, int);

static int tea5767_match(device_t, cfdata_t, void *);
static void tea5767_attach(device_t, device_t, void *);

static const struct radio_hw_if tea5767_hw_if = {
       NULL,
       NULL,
       tea5767_get_info,
       tea5767_set_info,
       tea5767_search
};

static const uint32_t tea5767_common_caps =
       RADIO_CAPS_DETECT_STEREO |
       RADIO_CAPS_SET_MONO |
       RADIO_CAPS_HW_SEARCH |
       RADIO_CAPS_LOCK_SENSITIVITY;

CFATTACH_DECL_NEW(tea5767radio, sizeof(struct tea5767_softc), tea5767_match,
       tea5767_attach, NULL, NULL);

static int
tea5767_match(device_t parent, cfdata_t cf, void *aux)
{
       struct i2c_attach_args *ia = aux;

       if (ia->ia_addr == TEA5767_ADDR)
               return I2C_MATCH_ADDRESS_ONLY;

       return 0;
}

static void
tea5767_attach(device_t parent, device_t self, void *aux)
{
       struct tea5767_softc *sc = device_private(self);
       int tea5767_flags = device_cfdata(self)->cf_flags;
       struct i2c_attach_args *ia = aux;

       aprint_normal(": Philips/NXP TEA5767 Radio\n");
       aprint_naive(": FM radio\n");

       sc->sc_dev = self;
       sc->tune.mute = 0;
       sc->tune.freq = MIN_FM_FREQ;
       sc->tune.stereo = 1;
       sc->tune.is_pll_set = false;
       sc->tune.is_xtal_set = false;
       sc->tune.is_force_srch = false;
       sc->sc_i2c_tag = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;

       if (tea5767_flags & TEA5767_PLL_FLAG)
               sc->tune.is_pll_set = true;
       if (tea5767_flags & TEA5767_XTAL_FLAG)
               sc->tune.is_xtal_set = true;
       if (tea5767_flags & TEA5767_JAPAN_FM_FLAG)
               sc->tune.fm_band = 1;
       if (tea5767_flags & TEA5767_FORCE_SRCH_FLAG)
               sc->tune.is_force_srch = true;

       sc->caps = tea5767_common_caps;

       /*
        * Check the quality of crystal and disable hardware search if
        * necessary.
        */
       if (!tea5767_if_check(sc) && !(sc->tune.is_force_srch))
               sc->caps &= ~RADIO_CAPS_HW_SEARCH;

       radio_attach_mi(&tea5767_hw_if, sc, self);
}

static int
tea5767_write(struct tea5767_softc *sc, uint8_t *reg)
{
       int exec_result;

       if (iic_acquire_bus(sc->sc_i2c_tag, 0)) {
               device_printf(sc->sc_dev, "bus acquiration failed.\n");
               return 1;
       }

       exec_result = iic_exec(sc->sc_i2c_tag, I2C_OP_WRITE_WITH_STOP,
           sc->sc_addr, NULL, 0, reg, 5, 0);

       if (exec_result) {
               iic_release_bus(sc->sc_i2c_tag, 0);
               device_printf(sc->sc_dev, "write operation failed %d.\n",
                   exec_result);
               return 1;
       }

       iic_release_bus(sc->sc_i2c_tag, 0);

       return 0;
}


static int
tea5767_read(struct tea5767_softc *sc, uint8_t *reg)
{
       int exec_result;

       if (iic_acquire_bus(sc->sc_i2c_tag, 0)) {
               device_printf(sc->sc_dev, "bus acquiration failed.\n");
               return 1;
       }

       exec_result = iic_exec(sc->sc_i2c_tag, I2C_OP_READ_WITH_STOP,
           sc->sc_addr, NULL, 0, reg, 5, 0);

       if (exec_result) {
               iic_release_bus(sc->sc_i2c_tag, 0);
               device_printf(sc->sc_dev, "read operation failed.\n");
               return 1;
       }

       iic_release_bus(sc->sc_i2c_tag, 0);
       return 0;
}

/*
* Calculate the PLL word.
* TODO: Extend this calculation to do high side injection as well
* (add fields to tea5767_tune).
*/
static void
tea5767_freq_to_pll(struct tea5767_tune tune, uint8_t *buf)
{
       uint16_t pll_word = 0;

       if (!tune.is_pll_set && !tune.is_xtal_set)
               pll_word = 4 * (tune.freq  - 225) * 1000 / 50000;
       else if (!tune.is_pll_set && tune.is_xtal_set) {
               pll_word = 4 * (tune.freq - 225) * 1000 / 32768;
               buf[3] = TEA5767_XTAL;
       }
       else {
               pll_word = 4 * (tune.freq - 225) * 1000 / 50000;
               buf[4] |= TEA5767_PLLREF;
       }

       buf[1] = pll_word & 0xff;
       buf[0] = (pll_word>>8) & 0x3f;
}

static void
tea5767_set_properties(struct tea5767_softc *sc, uint8_t *reg)
{
       memset(reg,0,5);

       tea5767_freq_to_pll(sc->tune, reg);

       if (sc->tune.mute) {
               reg[0] |= TEA5767_MUTE;
               reg[2] |=TEA5767_MUTE_R | TEA5767_MUTE_L;
       }

       reg[3] |= TEA5767_SNC;

       if (sc->tune.stereo == 0)
               reg[2] |= TEA5767_MONO;
       if(sc->tune.fm_band)
               reg[3] |= TEA5767_FM_BAND;
}

static bool
tea5767_if_check(struct tea5767_soft *sc)
{
       uint8_t reg[5];

       tea5767_set_properties(sc, reg);
       tea5767_write(sc, reg);

       memset(reg,0,5);
       delay(1000);
       tea5767_read(sc,reg);

       if ((reg[2] & 0x7f) == 0x37)
               return true;
       return false;
}

static void
tea5767_pll_to_freq(struct tea5767_tune *tune, uint8_t *buf)
{
       int pll_word = buf[1] | (buf[0] & 0x3f) << 8;
       if (!tune->is_pll_set && !tune->is_xtal_set)
               tune->freq = pll_word * 50 / 4 + 225;
       else if (!tune->is_pll_set && tune->is_xtal_set)
               tune->freq = pll_word * 32768 / 4000 + 225;
       else
               tune->freq = pll_word * 50 / 4 + 225;
}

static int
tea5767_get_info(void *v, struct radio_info *ri)
{
       struct tea5767_softc *sc = v;
       uint8_t reg[5];
       tea5767_read(sc, reg);

       tea5767_pll_to_freq(&sc->tune, reg);
       ri->mute = sc->tune.mute;
       ri->stereo = sc->tune.stereo;
       ri->freq = sc->tune.freq;
       ri->lock = sc->tune.lock;

       ri->caps = sc->caps;

       return 0;
}

static int
tea5767_set_info(void *v, struct radio_info *ri)
{
       struct tea5767_softc *sc = v;
       int adc_conversion;
       uint8_t reg[5];

       sc->tune.mute = ri->mute;
       sc->tune.stereo = ri->stereo;
       sc->tune.freq = ri->freq;
       sc->tune.lock = ri->lock;

       adc_conversion = (ri->lock-60) * 3 / 30;

       switch(adc_conversion) {
       case 0: sc->tune.adc_stop_level = TEA5767_SSL_3;
               break;
       case 1: sc->tune.adc_stop_level = TEA5767_SSL_2;
               break;
       case 2: sc->tune.adc_stop_level = TEA5767_SSL_1;
               break;
       }

       tea5767_set_properties(sc, reg);
       tea5767_write(sc, reg);
       return 0;
}

static int
tea5767_search(void *v, int dir)
{
       struct tea5767_softc *sc = v;
       uint8_t reg[5];

       /* Increment frequency to search for the next frequency. */
       sc->tune.freq = sc->tune.freq >= 107500 ? 87500 : sc->tune.freq + 100;
       tea5767_set_properties(sc, reg);

       /* Activate autonomous search. */
       reg[0] |= TEA5767_SEARCH;

       /*
        * If dir 1 => search up, if dir 0 => search down.
        */
       if (dir)
               reg[2] |= TEA5767_SUD;

       reg[2] |= sc->tune.adc_stop_level; /* Stop level for search. */

       tea5767_write(sc, reg);

       memset(reg, 0, 5);

       while (tea5767_read(sc, reg), !(reg[0] & TEA5767_READY_FLAG)) {
               kpause("teasrch", true, hz/100, NULL);
       }

       return 0;
}

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