/*      $NetBSD: sgsmix.c,v 1.11 2024/05/18 00:02:04 thorpej Exp $      */

/*-
 * Copyright (C) 2005 Michael Lorenz.
 *
 * 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 AUTHOR ``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 AUTHOR 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.
 */

/* 
 * a driver for the SGS TDA7433 mixer chip found in Beige PowerMac G3 and
 * probably others
 */


#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sgsmix.c,v 1.11 2024/05/18 00:02:04 thorpej Exp $");

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

#include <dev/i2c/i2cvar.h>

#include <dev/i2c/sgsmixvar.h>
#include "opt_sgsmix.h"

#ifdef SGSMIX_DEBUG
#define DPRINTF printf
#else
#define DPRINTF while (0) printf
#endif

struct sgsmix_softc {
        device_t sc_dev;
        device_t sc_parent;
        i2c_tag_t sc_i2c;
        int sc_node, sc_address;
        uint8_t sc_regs[7];
};

#define SGSREG_INPUT_SELECT     0
#define SGSREG_MASTER_GAIN      1
#define SGSREG_BASS_TREBLE      2
#define SGSREG_SPEAKER_L        3
#define SGSREG_HEADPHONES_L     4
#define SGSREG_SPEAKER_R        5
#define SGSREG_HEADPHONES_R     6

static void sgsmix_attach(device_t, device_t, void *);
static int sgsmix_match(device_t, cfdata_t, void *);
static void sgsmix_setup(struct sgsmix_softc *);
static void sgsmix_writereg(struct sgsmix_softc *, int, uint8_t);

CFATTACH_DECL_NEW(sgsmix, sizeof(struct sgsmix_softc),
    sgsmix_match, sgsmix_attach, NULL, NULL);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "st,tda7433" },
        DEVICE_COMPAT_EOL
};

static int
sgsmix_match(device_t parent, cfdata_t cf, void *aux)
{
        struct i2c_attach_args *args = aux;
        int ret = -1;
        uint8_t out[2] = {1, 0x20};
        int match_result;

        if (iic_use_direct_match(args, cf, compat_data, &match_result))
                return match_result;

        /* see if we can talk to something at address 0x8a */
        if (args->ia_addr != 0x8a)
                return 0;

        iic_acquire_bus(args->ia_tag, 0);
        ret = iic_exec(args->ia_tag, I2C_OP_WRITE, args->ia_addr,
            out, 2, NULL, 0, 0);
        iic_release_bus(args->ia_tag, 0);

        return (ret >= 0) ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
}

static void
sgsmix_attach(device_t parent, device_t self, void *aux)
{
        struct sgsmix_softc *sc = device_private(self);
        struct i2c_attach_args *args = aux;

        sc->sc_dev = self;
        sc->sc_parent = parent;
        sc->sc_address = args->ia_addr;
        aprint_normal(": SGS TDA7433 Basic Audio Processor\n");
        sc->sc_i2c = args->ia_tag;
        sgsmix_setup(sc);
}

static void
sgsmix_setup(struct sgsmix_softc *sc)
{
        int i;
        uint8_t out[2];

        sc->sc_regs[0] = 9;     /* input 1 */
        sc->sc_regs[1] = 0x20;  /* master gain 0dB */
        sc->sc_regs[2] = 0x77;  /* flat bass / treble */        
        sc->sc_regs[3] = 0;     /* all speakers full volume */
        sc->sc_regs[4] = 0;
        sc->sc_regs[5] = 0;
        sc->sc_regs[6] = 0;
        
        iic_acquire_bus(sc->sc_i2c, 0);

        for (i = 0; i < 7; i++) {
                out[0] = i;
                out[1] = sc->sc_regs[i];
                iic_exec(sc->sc_i2c, I2C_OP_WRITE, sc->sc_address, out, 2,
                    NULL, 0, 0);
        }

        iic_release_bus(sc->sc_i2c, 0);
}

static void
sgsmix_writereg(struct sgsmix_softc *sc, int reg, uint8_t val)
{
        uint8_t out[2] = {reg, val};

        if ((reg < 0) || (reg >= 7))
                return;

        if (sc->sc_regs[reg] == val)
                return;

        if (iic_exec(sc->sc_i2c, I2C_OP_WRITE, sc->sc_address, out, 2, NULL,
            0, 0) == 0) {
                sc->sc_regs[reg] = val;
        }
}

void
sgsmix_set_speaker_vol(void *cookie, int left, int right)
{
        struct sgsmix_softc *sc = device_private((device_t)cookie);

        DPRINTF("%s: speaker %d %d\n", device_xname(sc->sc_dev), left, right);
        if (left == 0) {
                sgsmix_writereg(sc, SGSREG_SPEAKER_L, 0x20);
        } else {
                sgsmix_writereg(sc, SGSREG_SPEAKER_L,
                    ((255 - left) >> 3) & 0x1f);
        }

        if (right == 0) {
                sgsmix_writereg(sc, SGSREG_SPEAKER_R, 0x20);
        } else {
                sgsmix_writereg(sc, SGSREG_SPEAKER_R,
                    ((255 - right) >> 3) & 0x1f);
        }
}

void
sgsmix_set_headphone_vol(void *cookie, int left, int right)
{
        struct sgsmix_softc *sc = device_private((device_t)cookie);

        DPRINTF("%s: headphones %d %d\n", device_xname(sc->sc_dev), left, right);
        if (left == 0) {
                sgsmix_writereg(sc, SGSREG_HEADPHONES_L, 0x20);
        } else {
                sgsmix_writereg(sc, SGSREG_HEADPHONES_L,
                    ((255 - left) >> 3) & 0x1f);
        }

        if (right == 0) {
                sgsmix_writereg(sc, SGSREG_HEADPHONES_R, 0x20);
        } else {
                sgsmix_writereg(sc, SGSREG_HEADPHONES_R,
                    ((255 - right) >> 3) & 0x1f);
        }
}

void
sgsmix_set_bass_treble(void *cookie, int bass, int treble)
{
        struct sgsmix_softc *sc = device_private((device_t)cookie);
        uint8_t b, t;

        t = (treble >> 4) & 0xf;
        if (t & 0x8)
                t ^= 7;
        b = bass & 0xf0;
        if (b & 0x80)
                b ^= 0x70;
        DPRINTF("%s: bass/treble %02x %02x\n", device_xname(sc->sc_dev), b, t);
        sgsmix_writereg(sc, SGSREG_BASS_TREBLE, b | t);
}