/* $NetBSD: simple_amplifier.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */

/*-
* Copyright (c) 2020 Jared McNeill <[email protected]>
* 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 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: simple_amplifier.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $");

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

#include <dev/audio/audio_dai.h>

#include <dev/fdt/fdtvar.h>

struct simple_amplifier_softc {
       device_t                sc_dev;
       struct audio_dai_device sc_dai;
       struct fdtbus_gpio_pin  *sc_pin;
       struct fdtbus_regulator *sc_vcc;
};

static int      simple_amplifier_match(device_t, cfdata_t, void *);
static void     simple_amplifier_attach(device_t, device_t, void *);

static const struct device_compatible_entry compat_data[] = {
       { .compat = "simple-audio-amplifier" },
       DEVICE_COMPAT_EOL
};

CFATTACH_DECL_NEW(simpleamp, sizeof(struct simple_amplifier_softc),
       simple_amplifier_match, simple_amplifier_attach, NULL, NULL);

static int
simple_amplifier_open(void *priv, int flags)
{
       struct simple_amplifier_softc * const sc = priv;
       int error;

       if (sc->sc_pin != NULL)
               fdtbus_gpio_write(sc->sc_pin, 1);

       if (sc->sc_vcc != NULL) {
               error = fdtbus_regulator_enable(sc->sc_vcc);
               if (error != 0)
                       aprint_error_dev(sc->sc_dev, "couldn't enable power supply\n");
       }

       return 0;
}

static void
simple_amplifier_close(void *priv)
{
       struct simple_amplifier_softc * const sc = priv;

       if (sc->sc_pin != NULL)
               fdtbus_gpio_write(sc->sc_pin, 0);

       if (sc->sc_vcc != NULL)
               (void)fdtbus_regulator_disable(sc->sc_vcc);
}

static const struct audio_hw_if simple_amplifier_hw_if = {
       .open = simple_amplifier_open,
       .close = simple_amplifier_close,
};

static audio_dai_tag_t
simple_amplifier_dai_get_tag(device_t dev, const void *data, size_t len)
{
       struct simple_amplifier_softc * const sc = device_private(dev);

       if (len != 4)
               return NULL;

       return &sc->sc_dai;
}

static struct fdtbus_dai_controller_func simple_amplifier_dai_funcs = {
       .get_tag = simple_amplifier_dai_get_tag
};

static int
simple_amplifier_match(device_t parent, cfdata_t cf, void *aux)
{
       struct fdt_attach_args * const faa = aux;

       return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
simple_amplifier_attach(device_t parent, device_t self, void *aux)
{
       struct simple_amplifier_softc * const sc = device_private(self);
       struct fdt_attach_args * const faa = aux;
       const int phandle = faa->faa_phandle;

       sc->sc_dev = self;
       sc->sc_pin = fdtbus_gpio_acquire(phandle, "enable-gpios", GPIO_PIN_OUTPUT);
       sc->sc_vcc = fdtbus_regulator_acquire(phandle, "VCC-supply");

       aprint_naive("\n");
       aprint_normal(": Simple Amplifier\n");

       sc->sc_dai.dai_hw_if = &simple_amplifier_hw_if;
       sc->sc_dai.dai_dev = self;
       sc->sc_dai.dai_priv = sc;
       fdtbus_register_dai_controller(self, phandle, &simple_amplifier_dai_funcs);
}