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@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
simple_amplifier_open(void * priv,int flags)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
simple_amplifier_close(void * priv)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
simple_amplifier_dai_get_tag(device_t dev,const void * data,size_t len)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
simple_amplifier_match(device_t parent,cfdata_t cf,void * aux)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
simple_amplifier_attach(device_t parent,device_t self,void * aux)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