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      1 /* $NetBSD: simple_amplifier.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2020 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: simple_amplifier.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/systm.h>
     36 #include <sys/sysctl.h>
     37 #include <sys/kmem.h>
     38 
     39 #include <dev/audio/audio_dai.h>
     40 
     41 #include <dev/fdt/fdtvar.h>
     42 
     43 struct simple_amplifier_softc {
     44 	device_t		sc_dev;
     45 	struct audio_dai_device	sc_dai;
     46 	struct fdtbus_gpio_pin	*sc_pin;
     47 	struct fdtbus_regulator	*sc_vcc;
     48 };
     49 
     50 static int	simple_amplifier_match(device_t, cfdata_t, void *);
     51 static void	simple_amplifier_attach(device_t, device_t, void *);
     52 
     53 static const struct device_compatible_entry compat_data[] = {
     54 	{ .compat = "simple-audio-amplifier" },
     55 	DEVICE_COMPAT_EOL
     56 };
     57 
     58 CFATTACH_DECL_NEW(simpleamp, sizeof(struct simple_amplifier_softc),
     59 	simple_amplifier_match, simple_amplifier_attach, NULL, NULL);
     60 
     61 static int
     62 simple_amplifier_open(void *priv, int flags)
     63 {
     64 	struct simple_amplifier_softc * const sc = priv;
     65 	int error;
     66 
     67 	if (sc->sc_pin != NULL)
     68 		fdtbus_gpio_write(sc->sc_pin, 1);
     69 
     70 	if (sc->sc_vcc != NULL) {
     71 		error = fdtbus_regulator_enable(sc->sc_vcc);
     72 		if (error != 0)
     73 			aprint_error_dev(sc->sc_dev, "couldn't enable power supply\n");
     74 	}
     75 
     76 	return 0;
     77 }
     78 
     79 static void
     80 simple_amplifier_close(void *priv)
     81 {
     82 	struct simple_amplifier_softc * const sc = priv;
     83 
     84 	if (sc->sc_pin != NULL)
     85 		fdtbus_gpio_write(sc->sc_pin, 0);
     86 
     87 	if (sc->sc_vcc != NULL)
     88 		(void)fdtbus_regulator_disable(sc->sc_vcc);
     89 }
     90 
     91 static const struct audio_hw_if simple_amplifier_hw_if = {
     92 	.open = simple_amplifier_open,
     93 	.close = simple_amplifier_close,
     94 };
     95 
     96 static audio_dai_tag_t
     97 simple_amplifier_dai_get_tag(device_t dev, const void *data, size_t len)
     98 {
     99 	struct simple_amplifier_softc * const sc = device_private(dev);
    100 
    101 	if (len != 4)
    102 		return NULL;
    103 
    104 	return &sc->sc_dai;
    105 }
    106 
    107 static struct fdtbus_dai_controller_func simple_amplifier_dai_funcs = {
    108 	.get_tag = simple_amplifier_dai_get_tag
    109 };
    110 
    111 static int
    112 simple_amplifier_match(device_t parent, cfdata_t cf, void *aux)
    113 {
    114 	struct fdt_attach_args * const faa = aux;
    115 
    116 	return of_compatible_match(faa->faa_phandle, compat_data);
    117 }
    118 
    119 static void
    120 simple_amplifier_attach(device_t parent, device_t self, void *aux)
    121 {
    122 	struct simple_amplifier_softc * const sc = device_private(self);
    123 	struct fdt_attach_args * const faa = aux;
    124 	const int phandle = faa->faa_phandle;
    125 
    126 	sc->sc_dev = self;
    127 	sc->sc_pin = fdtbus_gpio_acquire(phandle, "enable-gpios", GPIO_PIN_OUTPUT);
    128 	sc->sc_vcc = fdtbus_regulator_acquire(phandle, "VCC-supply");
    129 
    130 	aprint_naive("\n");
    131 	aprint_normal(": Simple Amplifier\n");
    132 
    133 	sc->sc_dai.dai_hw_if = &simple_amplifier_hw_if;
    134 	sc->sc_dai.dai_dev = self;
    135 	sc->sc_dai.dai_priv = sc;
    136 	fdtbus_register_dai_controller(self, phandle, &simple_amplifier_dai_funcs);
    137 }
    138