/*      $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);
}

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