xref: /freebsd/sys/dev/sound/fdt/dummy_codec.c (revision e32fecd0c2c3ee37c47ee100f169e7eb0282a873)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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  * $FreeBSD$
28  */
29 
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
40 #include <sys/rman.h>
41 #include <sys/resource.h>
42 #include <machine/bus.h>
43 
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46 
47 #include "opt_snd.h"
48 #include <dev/sound/pcm/sound.h>
49 #include <dev/sound/fdt/audio_dai.h>
50 #include "audio_dai_if.h"
51 
52 static struct ofw_compat_data compat_data[] = {
53 	{ "dummy-codec",	1},
54 	{ NULL,			0 }
55 };
56 
57 struct dummy_codec_softc {
58 	device_t	dev;
59 };
60 
61 static int dummy_codec_probe(device_t dev);
62 static int dummy_codec_attach(device_t dev);
63 static int dummy_codec_detach(device_t dev);
64 
65 static int
66 dummy_codec_probe(device_t dev)
67 {
68 	if (!ofw_bus_status_okay(dev))
69 		return (ENXIO);
70 
71 	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
72 		return (ENXIO);
73 
74 	device_set_desc(dev, "Dummy Codec");
75 	return (BUS_PROBE_DEFAULT);
76 }
77 
78 static int
79 dummy_codec_attach(device_t dev)
80 {
81 	struct dummy_codec_softc *sc;
82 	phandle_t node;
83 
84 	sc = device_get_softc(dev);
85 	sc->dev = dev;
86 
87 	node = ofw_bus_get_node(dev);
88 	OF_device_register_xref(OF_xref_from_node(node), dev);
89 
90 	return (0);
91 }
92 
93 static int
94 dummy_codec_detach(device_t dev)
95 {
96 
97 	return (0);
98 }
99 
100 static int
101 dummy_codec_dai_init(device_t dev, uint32_t format)
102 {
103 
104 	return (0);
105 }
106 
107 static device_method_t dummy_codec_methods[] = {
108 	/* Device interface */
109 	DEVMETHOD(device_probe,		dummy_codec_probe),
110 	DEVMETHOD(device_attach,	dummy_codec_attach),
111 	DEVMETHOD(device_detach,	dummy_codec_detach),
112 
113 	DEVMETHOD(audio_dai_init,	dummy_codec_dai_init),
114 
115 	DEVMETHOD_END
116 };
117 
118 static driver_t dummy_codec_driver = {
119 	"dummycodec",
120 	dummy_codec_methods,
121 	sizeof(struct dummy_codec_softc),
122 };
123 
124 DRIVER_MODULE(dummy_codec, simplebus, dummy_codec_driver, 0, 0);
125 SIMPLEBUS_PNP_INFO(compat_data);
126