/* $NetBSD: aztech.c,v 1.17 2012/10/27 17:18:24 chs Exp $ */
/* $OpenBSD: aztech.c,v 1.2 2001/12/05 10:27:06 mickey Exp $ */
/* $RuOBSD: aztech.c,v 1.11 2001/10/20 13:23:47 pva Exp $ */

/*
 * Copyright (c) 2001 Maxim Tsyplakov <tm@oganer.net>,
 *                    Vladimir Popov <jumbo@narod.ru>
 * 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 AUTHORS ``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 AUTHORS 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.
 */

/* Aztech/PackardBell FM Radio Card device driver */

/*
 * Sanyo LM7001J Direct PLL Frequency Synthesizer:
 *     ??? See http://www.redsword.com/tjacobs/geeb/fmcard.htm
 *
 * Philips TEA5712T AM/FM Stereo DTS Radio:
 *     http://www.semiconductors.philips.com/pip/TEA5712
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aztech.c,v 1.17 2012/10/27 17:18:24 chs Exp $");

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

#include <sys/bus.h>

#include <dev/isa/isavar.h>
#include <dev/ic/lm700x.h>
#include <dev/radio_if.h>

#define RF_25K  25
#define RF_50K  50
#define RF_100K 100

#define MAX_VOL 3
#define VOLUME_RATIO(x) (255 * x / MAX_VOL)

#define AZ_BASE_VALID(x)        ((x == 0x350) || (x == 0x358))
#define AZTECH_CAPABILITIES     RADIO_CAPS_DETECT_STEREO |              \
                                RADIO_CAPS_DETECT_SIGNAL |              \
                                RADIO_CAPS_SET_MONO |                   \
                                RADIO_CAPS_REFERENCE_FREQ

#define AZ_WREN_ON      (1 << 1)
#define AZ_WREN_OFF     (0 << 1)

#define AZ_CLCK_ON      (1 << 6)
#define AZ_CLCK_OFF     (0 << 6)

#define AZ_DATA_ON      (1 << 7)
#define AZ_DATA_OFF     (0 << 7)

int     az_probe(device_t, cfdata_t, void *);
void    az_attach(device_t, device_t, void *);

int     az_get_info(void *, struct radio_info *);
int     az_set_info(void *, struct radio_info *);

const struct radio_hw_if az_hw_if = {
        NULL,   /* open */
        NULL,   /* close */
        az_get_info,
        az_set_info,
        NULL
};

struct az_softc {
        int             mute;
        u_int8_t        vol;
        u_int32_t       freq;
        u_int32_t       rf;
        u_int32_t       stereo;

        struct lm700x_t lm;
};

CFATTACH_DECL_NEW(az, sizeof(struct az_softc),
    az_probe, az_attach, NULL, NULL);

u_int   az_find(bus_space_tag_t, bus_space_handle_t);
void    az_set_mute(struct az_softc *);
void    az_set_freq(struct az_softc *, u_int32_t);
u_int8_t        az_state(bus_space_tag_t, bus_space_handle_t);

void    az_lm700x_init(bus_space_tag_t, bus_space_handle_t, bus_size_t, u_int32_t);
void    az_lm700x_rset(bus_space_tag_t, bus_space_handle_t, bus_size_t, u_int32_t);

u_int8_t        az_conv_vol(u_int8_t);
u_int8_t        az_unconv_vol(u_int8_t);

int
az_probe(device_t parent, cfdata_t cf, void *aux)
{
        struct isa_attach_args *ia = aux;
        bus_space_tag_t iot = ia->ia_iot;
        bus_space_handle_t ioh;
        u_int r;
        int iosize = 1, iobase;

        if (ISA_DIRECT_CONFIG(ia))
                return 0;

        if (ia->ia_nio < 1)
                return 0;

        iobase = ia->ia_io[0].ir_addr;

        if (!AZ_BASE_VALID(iobase)) {
                printf("az: configured iobase 0x%x invalid", iobase);
                return 0;
        }

        if (bus_space_map(iot, iobase, iosize, 0, &ioh))
                return 0;

        r = az_find(iot, ioh);

        bus_space_unmap(iot, ioh, iosize);

        if (r != 0) {
                ia->ia_nio = 1;
                ia->ia_io[0].ir_size = iosize;

                ia->ia_niomem = 0;
                ia->ia_nirq = 0;
                ia->ia_ndrq = 0;

                return (1);
        }

        return (0);
}

void
az_attach(device_t parent, device_t self, void *aux)
{
        struct az_softc *sc = device_private(self);
        struct isa_attach_args *ia = aux;

        sc->lm.iot = ia->ia_iot;
        sc->rf = LM700X_REF_050;
        sc->stereo = LM700X_STEREO;
        sc->mute = 0;
        sc->freq = MIN_FM_FREQ;
        sc->vol = 0;

        /* remap I/O */
        if (bus_space_map(sc->lm.iot, ia->ia_io[0].ir_addr,
            ia->ia_io[0].ir_size, 0, &sc->lm.ioh))
                panic(": bus_space_map() of %s failed", device_xname(self));

        printf(": Aztech/PackardBell\n");

        /* Configure struct lm700x_t lm */
        sc->lm.offset = 0;
        sc->lm.wzcl = AZ_WREN_ON | AZ_CLCK_OFF | AZ_DATA_OFF;
        sc->lm.wzch = AZ_WREN_ON | AZ_CLCK_ON  | AZ_DATA_OFF;
        sc->lm.wocl = AZ_WREN_ON | AZ_CLCK_OFF | AZ_DATA_ON;
        sc->lm.woch = AZ_WREN_ON | AZ_CLCK_ON  | AZ_DATA_ON;
        sc->lm.initdata = 0;
        sc->lm.rsetdata = AZ_DATA_ON | AZ_CLCK_ON | AZ_WREN_OFF;
        sc->lm.init = az_lm700x_init;
        sc->lm.rset = az_lm700x_rset;

        az_set_freq(sc, sc->freq);

        radio_attach_mi(&az_hw_if, sc, self);
}

/*
 * Mute the card
 */
void
az_set_mute(struct az_softc *sc)
{
        bus_space_write_1(sc->lm.iot, sc->lm.ioh, 0,
            sc->mute ? 0 : sc->vol);
        delay(6);
        bus_space_write_1(sc->lm.iot, sc->lm.ioh, 0,
            sc->mute ? 0 : sc->vol);
}

void
az_set_freq(struct az_softc *sc, u_int32_t nfreq)
{
        u_int8_t vol;
        u_int32_t reg;

        vol = sc->mute ? 0 : sc->vol;

        if (nfreq > MAX_FM_FREQ)
                nfreq = MAX_FM_FREQ;
        if (nfreq < MIN_FM_FREQ)
                nfreq = MIN_FM_FREQ;

        sc->freq = nfreq;

        reg = lm700x_encode_freq(nfreq, sc->rf);
        reg |= sc->stereo | sc->rf | LM700X_DIVIDER_FM;

        lm700x_hardware_write(&sc->lm, reg, vol);

        az_set_mute(sc);
}

/*
 * Return state of the card - tuned/not tuned, mono/stereo
 */
u_int8_t
az_state(bus_space_tag_t iot, bus_space_handle_t ioh)
{
        return (3 ^ bus_space_read_1(iot, ioh, 0)) & 3;
}

/*
 * Convert volume to hardware representation.
 * The card uses bits 00000x0x to set volume.
 */
u_int8_t
az_conv_vol(u_int8_t vol)
{
        if (vol < VOLUME_RATIO(1))
                return 0;
        else if (vol >= VOLUME_RATIO(1) && vol < VOLUME_RATIO(2))
                return 1;
        else if (vol >= VOLUME_RATIO(2) && vol < VOLUME_RATIO(3))
                return 4;
        else
                return 5;
}

/*
 * Convert volume from hardware representation
 */
u_int8_t
az_unconv_vol(u_int8_t vol)
{
        switch (vol) {
        case 0:
                return VOLUME_RATIO(0);
        case 1:
                return VOLUME_RATIO(1);
        case 4:
                return VOLUME_RATIO(2);
        }
        return VOLUME_RATIO(3);
}

u_int
az_find(bus_space_tag_t iot, bus_space_handle_t ioh)
{
        struct az_softc sc;
        u_int i, scanres = 0;

        sc.lm.iot = iot;
        sc.lm.ioh = ioh;
        sc.lm.offset = 0;
        sc.lm.wzcl = AZ_WREN_ON | AZ_CLCK_OFF | AZ_DATA_OFF;
        sc.lm.wzch = AZ_WREN_ON | AZ_CLCK_ON  | AZ_DATA_OFF;
        sc.lm.wocl = AZ_WREN_ON | AZ_CLCK_OFF | AZ_DATA_ON;
        sc.lm.woch = AZ_WREN_ON | AZ_CLCK_ON  | AZ_DATA_ON;
        sc.lm.initdata = 0;
        sc.lm.rsetdata = AZ_DATA_ON | AZ_CLCK_ON | AZ_WREN_OFF;
        sc.lm.init = az_lm700x_init;
        sc.lm.rset = az_lm700x_rset;
        sc.rf = LM700X_REF_050;
        sc.mute = 0;
        sc.stereo = LM700X_STEREO;
        sc.vol = 0;

        /*
         * Scan whole FM range. If there is a card it'll
         * respond on some frequency.
         */
        for (i = MIN_FM_FREQ; !scanres && i < MAX_FM_FREQ; i += 10) {
                az_set_freq(&sc, i);
                scanres += 3 - az_state(iot, ioh);
        }

        return scanres;
}

void
az_lm700x_init(bus_space_tag_t iot, bus_space_handle_t ioh,
    bus_size_t off, u_int32_t data)
{
        /* Do nothing */
        return;
}

void
az_lm700x_rset(bus_space_tag_t iot, bus_space_handle_t ioh, bus_size_t off,
                u_int32_t data)
{
        bus_space_write_1(iot, ioh, off, data);
}

int
az_get_info(void *v, struct radio_info *ri)
{
        struct az_softc *sc = v;

        ri->mute = sc->mute;
        ri->volume = az_unconv_vol(sc->vol);
        ri->stereo = sc->stereo == LM700X_STEREO ? 1 : 0;
        ri->caps = AZTECH_CAPABILITIES;
        ri->rfreq = lm700x_decode_ref(sc->rf);
        ri->info = az_state(sc->lm.iot, sc->lm.ioh);
        ri->freq = sc->freq;

        /* UNSUPPORTED */
        ri->lock = 0;

        return (0);
}

int
az_set_info(void *v, struct radio_info *ri)
{
        struct az_softc *sc = v;

        sc->mute = ri->mute ? 1 : 0;
        sc->vol = az_conv_vol(ri->volume);
        sc->stereo = ri->stereo ? LM700X_STEREO : LM700X_MONO;
        sc->rf = lm700x_encode_ref(ri->rfreq);

        az_set_freq(sc, ri->freq);
        az_set_mute(sc);

        return (0);
}