1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 Oleksandr Tymoshenko <gonzo@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/param.h>
29#include <sys/systm.h>
30#include <sys/bus.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/module.h>
34#include <sys/mutex.h>
35#include <sys/rman.h>
36#include <sys/resource.h>
37#include <machine/bus.h>
38
39#include <dev/ofw/ofw_bus.h>
40#include <dev/ofw/ofw_bus_subr.h>
41
42#include <dev/regulator/regulator.h>
43#include <dev/gpio/gpiobusvar.h>
44
45#include "opt_snd.h"
46#include <dev/sound/pcm/sound.h>
47#include <dev/sound/fdt/audio_dai.h>
48#include "audio_dai_if.h"
49
50static struct ofw_compat_data compat_data[] = {
51	{ "simple-audio-amplifier",	1},
52	{ NULL,				0}
53};
54
55struct simple_amp_softc {
56	device_t	dev;
57	regulator_t	supply_vcc;
58	gpio_pin_t	gpio_enable;
59	bool		gpio_is_valid;
60};
61
62static int simple_amp_probe(device_t dev);
63static int simple_amp_attach(device_t dev);
64static int simple_amp_detach(device_t dev);
65
66static int
67simple_amp_probe(device_t dev)
68{
69	if (!ofw_bus_status_okay(dev))
70		return (ENXIO);
71
72	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
73		return (ENXIO);
74
75	device_set_desc(dev, "Simple Amplifier");
76	return (BUS_PROBE_DEFAULT);
77}
78
79static int
80simple_amp_attach(device_t dev)
81{
82	struct simple_amp_softc *sc;
83	phandle_t node;
84	int error;
85
86	sc = device_get_softc(dev);
87	sc->dev = dev;
88	node = ofw_bus_get_node(dev);
89
90	error = gpio_pin_get_by_ofw_property(dev, node,
91	    "enable-gpios", &sc->gpio_enable);
92	if (error != 0)
93		sc->gpio_is_valid = false;
94	else
95		sc->gpio_is_valid = true;
96
97	error = regulator_get_by_ofw_property(dev, 0, "VCC-supply",
98	    &sc->supply_vcc);
99	if (error != 0)
100		device_printf(dev, "no VCC supply");
101
102	OF_device_register_xref(OF_xref_from_node(node), dev);
103
104	return (0);
105}
106
107static int
108simple_amp_detach(device_t dev)
109{
110
111	return (0);
112}
113
114static int
115simple_amp_dai_init(device_t dev, uint32_t format)
116{
117
118	return (0);
119}
120
121static int
122simple_amp_dai_trigger(device_t dev, int go, int pcm_dir)
123{
124	struct simple_amp_softc	*sc;
125	int error;
126
127	if ((pcm_dir != PCMDIR_PLAY) && (pcm_dir != PCMDIR_REC))
128		return (EINVAL);
129
130	sc = device_get_softc(dev);
131	error = 0;
132	switch (go) {
133	case PCMTRIG_START:
134		if (sc->supply_vcc != NULL) {
135			error = regulator_enable(sc->supply_vcc);
136			if (error != 0) {
137				device_printf(sc->dev,
138				    "could not enable 'VCC' regulator\n");
139				break;
140			}
141		}
142
143		if (sc->gpio_is_valid) {
144			error = gpio_pin_set_active(sc->gpio_enable, 1);
145			if (error != 0) {
146				device_printf(sc->dev,
147				    "could not set 'gpio-enable' gpio\n");
148				break;
149			}
150		}
151
152		break;
153
154	case PCMTRIG_STOP:
155	case PCMTRIG_ABORT:
156		if (sc->gpio_is_valid) {
157			error = gpio_pin_set_active(sc->gpio_enable, 0);
158			if (error != 0) {
159				device_printf(sc->dev,
160				    "could not clear 'gpio-enable' gpio\n");
161				break;
162			}
163		}
164
165		if (sc->supply_vcc != NULL) {
166			error = regulator_disable(sc->supply_vcc);
167			if (error != 0) {
168				device_printf(sc->dev,
169				    "could not disable 'VCC' regulator\n");
170				break;
171			}
172		}
173
174		break;
175	}
176
177	return (error);
178}
179
180static device_method_t simple_amp_methods[] = {
181	/* Device interface */
182	DEVMETHOD(device_probe,		simple_amp_probe),
183	DEVMETHOD(device_attach,	simple_amp_attach),
184	DEVMETHOD(device_detach,	simple_amp_detach),
185
186	DEVMETHOD(audio_dai_init,	simple_amp_dai_init),
187	DEVMETHOD(audio_dai_trigger,	simple_amp_dai_trigger),
188
189	DEVMETHOD_END
190};
191
192static driver_t simple_amp_driver = {
193	"simpleamp",
194	simple_amp_methods,
195	sizeof(struct simple_amp_softc),
196};
197
198DRIVER_MODULE(simple_amp, simplebus, simple_amp_driver, 0, 0);
199SIMPLEBUS_PNP_INFO(compat_data);
200