1/* $NetBSD: spdif_tx.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2019 Jared McNeill <jmcneill@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: spdif_tx.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
43struct spdif_tx_softc {
44	device_t		sc_dev;
45	struct audio_dai_device	sc_dai;
46};
47
48static int	spdif_tx_match(device_t, cfdata_t, void *);
49static void	spdif_tx_attach(device_t, device_t, void *);
50
51static const struct device_compatible_entry compat_data[] = {
52	{ .compat = "linux,spdif-dit" },
53	DEVICE_COMPAT_EOL
54};
55
56CFATTACH_DECL_NEW(spdiftx, sizeof(struct spdif_tx_softc),
57	spdif_tx_match, spdif_tx_attach, NULL, NULL);
58
59static int
60spdif_tx_set_format(audio_dai_tag_t dai, u_int format)
61{
62	return 0;
63}
64
65static int
66spdif_tx_add_device(audio_dai_tag_t dai, audio_dai_tag_t aux)
67{
68	return 0;
69}
70
71static const struct audio_hw_if spdif_tx_hw_if = { };
72
73static audio_dai_tag_t
74spdif_tx_dai_get_tag(device_t dev, const void *data, size_t len)
75{
76	struct spdif_tx_softc * const sc = device_private(dev);
77
78	if (len != 4)
79		return NULL;
80
81	return &sc->sc_dai;
82}
83
84static struct fdtbus_dai_controller_func spdif_tx_dai_funcs = {
85	.get_tag = spdif_tx_dai_get_tag
86};
87
88static int
89spdif_tx_match(device_t parent, cfdata_t cf, void *aux)
90{
91	struct fdt_attach_args * const faa = aux;
92
93	return of_compatible_match(faa->faa_phandle, compat_data);
94}
95
96static void
97spdif_tx_attach(device_t parent, device_t self, void *aux)
98{
99	struct spdif_tx_softc * const sc = device_private(self);
100	struct fdt_attach_args * const faa = aux;
101	const int phandle = faa->faa_phandle;
102
103	sc->sc_dev = self;
104
105	aprint_naive("\n");
106	aprint_normal(": SPDIF transmitter\n");
107
108	sc->sc_dai.dai_set_format = spdif_tx_set_format;
109	sc->sc_dai.dai_add_device = spdif_tx_add_device;
110	sc->sc_dai.dai_hw_if = &spdif_tx_hw_if;
111	sc->sc_dai.dai_dev = self;
112	sc->sc_dai.dai_priv = sc;
113	fdtbus_register_dai_controller(self, phandle, &spdif_tx_dai_funcs);
114}
115