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
43 struct spdif_tx_softc {
44 device_t sc_dev;
45 struct audio_dai_device sc_dai;
46 };
47
48 static int spdif_tx_match(device_t, cfdata_t, void *);
49 static void spdif_tx_attach(device_t, device_t, void *);
50
51 static const struct device_compatible_entry compat_data[] = {
52 { .compat = "linux,spdif-dit" },
53 DEVICE_COMPAT_EOL
54 };
55
56 CFATTACH_DECL_NEW(spdiftx, sizeof(struct spdif_tx_softc),
57 spdif_tx_match, spdif_tx_attach, NULL, NULL);
58
59 static int
spdif_tx_set_format(audio_dai_tag_t dai,u_int format)60 spdif_tx_set_format(audio_dai_tag_t dai, u_int format)
61 {
62 return 0;
63 }
64
65 static int
spdif_tx_add_device(audio_dai_tag_t dai,audio_dai_tag_t aux)66 spdif_tx_add_device(audio_dai_tag_t dai, audio_dai_tag_t aux)
67 {
68 return 0;
69 }
70
71 static const struct audio_hw_if spdif_tx_hw_if = { };
72
73 static audio_dai_tag_t
spdif_tx_dai_get_tag(device_t dev,const void * data,size_t len)74 spdif_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
84 static struct fdtbus_dai_controller_func spdif_tx_dai_funcs = {
85 .get_tag = spdif_tx_dai_get_tag
86 };
87
88 static int
spdif_tx_match(device_t parent,cfdata_t cf,void * aux)89 spdif_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
96 static void
spdif_tx_attach(device_t parent,device_t self,void * aux)97 spdif_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