1 /* $OpenBSD: simpleamp.c,v 1.4 2022/04/06 18:59:28 naddy Exp $ */
2 /*
3 * Copyright (c) 2020 Patrick Wildt <patrick@blueri.se>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/device.h>
21 #include <sys/malloc.h>
22
23 #include <machine/fdt.h>
24
25 #include <dev/ofw/openfirm.h>
26 #include <dev/ofw/ofw_gpio.h>
27 #include <dev/ofw/ofw_misc.h>
28 #include <dev/ofw/ofw_regulator.h>
29
30 #include <sys/audioio.h>
31 #include <dev/audio_if.h>
32 #include <dev/midi_if.h>
33
34 int simpleamp_match(struct device *, void *, void *);
35 void simpleamp_attach(struct device *, struct device *, void *);
36
37 int simpleamp_open(void *, int);
38 void simpleamp_close(void *);
39
40 struct simpleamp_softc {
41 struct device sc_dev;
42 struct dai_device sc_dai;
43
44 uint32_t *sc_gpio;
45 int sc_gpiolen;
46 uint32_t sc_vcc;
47 };
48
49 const struct audio_hw_if simpleamp_hw_if = {
50 .open = simpleamp_open,
51 .close = simpleamp_close,
52 };
53
54 const struct cfattach simpleamp_ca = {
55 sizeof(struct simpleamp_softc), simpleamp_match, simpleamp_attach
56 };
57
58 struct cfdriver simpleamp_cd = {
59 NULL, "simpleamp", DV_DULL
60 };
61
62 int
simpleamp_match(struct device * parent,void * match,void * aux)63 simpleamp_match(struct device *parent, void *match, void *aux)
64 {
65 struct fdt_attach_args *faa = aux;
66
67 return OF_is_compatible(faa->fa_node, "simple-audio-amplifier");
68 }
69
70 void
simpleamp_attach(struct device * parent,struct device * self,void * aux)71 simpleamp_attach(struct device *parent, struct device *self, void *aux)
72 {
73 struct simpleamp_softc *sc = (struct simpleamp_softc *)self;
74 struct fdt_attach_args *faa = aux;
75
76 sc->sc_gpiolen = OF_getproplen(faa->fa_node, "enable-gpios");
77 if (sc->sc_gpiolen > 0) {
78 sc->sc_gpio = malloc(sc->sc_gpiolen, M_DEVBUF, M_WAITOK);
79 OF_getpropintarray(faa->fa_node, "enable-gpios",
80 sc->sc_gpio, sc->sc_gpiolen);
81 gpio_controller_config_pin(sc->sc_gpio, GPIO_CONFIG_OUTPUT);
82 }
83 sc->sc_vcc = OF_getpropint(faa->fa_node, "VCC-supply", 0);
84
85 printf("\n");
86
87 sc->sc_dai.dd_node = faa->fa_node;
88 sc->sc_dai.dd_cookie = sc;
89 sc->sc_dai.dd_hw_if = &simpleamp_hw_if;
90 dai_register(&sc->sc_dai);
91 }
92
93 int
simpleamp_open(void * cookie,int flags)94 simpleamp_open(void *cookie, int flags)
95 {
96 struct simpleamp_softc *sc = cookie;
97
98 if (sc->sc_gpio)
99 gpio_controller_set_pin(sc->sc_gpio, 1);
100 if (sc->sc_vcc)
101 regulator_enable(sc->sc_vcc);
102
103 return 0;
104 }
105
106 void
simpleamp_close(void * cookie)107 simpleamp_close(void *cookie)
108 {
109 struct simpleamp_softc *sc = cookie;
110
111 if (sc->sc_gpio)
112 gpio_controller_set_pin(sc->sc_gpio, 0);
113 if (sc->sc_vcc)
114 regulator_disable(sc->sc_vcc);
115 }
116