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 <dev/extres/regulator/regulator.h> 48 #include <dev/gpio/gpiobusvar.h> 49 50 #include "opt_snd.h" 51 #include <dev/sound/pcm/sound.h> 52 #include <dev/sound/fdt/audio_dai.h> 53 #include "audio_dai_if.h" 54 55 static struct ofw_compat_data compat_data[] = { 56 { "simple-audio-amplifier", 1}, 57 { NULL, 0} 58 }; 59 60 struct simple_amp_softc { 61 device_t dev; 62 regulator_t supply_vcc; 63 gpio_pin_t gpio_enable; 64 bool gpio_is_valid; 65 }; 66 67 static int simple_amp_probe(device_t dev); 68 static int simple_amp_attach(device_t dev); 69 static int simple_amp_detach(device_t dev); 70 71 static int 72 simple_amp_probe(device_t dev) 73 { 74 if (!ofw_bus_status_okay(dev)) 75 return (ENXIO); 76 77 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 78 return (ENXIO); 79 80 device_set_desc(dev, "Simple Amplifier"); 81 return (BUS_PROBE_DEFAULT); 82 } 83 84 static int 85 simple_amp_attach(device_t dev) 86 { 87 struct simple_amp_softc *sc; 88 phandle_t node; 89 int error; 90 91 sc = device_get_softc(dev); 92 sc->dev = dev; 93 node = ofw_bus_get_node(dev); 94 95 error = gpio_pin_get_by_ofw_property(dev, node, 96 "enable-gpios", &sc->gpio_enable); 97 if (error != 0) 98 sc->gpio_is_valid = false; 99 else 100 sc->gpio_is_valid = true; 101 102 error = regulator_get_by_ofw_property(dev, 0, "VCC-supply", 103 &sc->supply_vcc); 104 if (error != 0) 105 device_printf(dev, "no VCC supply"); 106 107 OF_device_register_xref(OF_xref_from_node(node), dev); 108 109 return (0); 110 } 111 112 static int 113 simple_amp_detach(device_t dev) 114 { 115 116 return (0); 117 } 118 119 static int 120 simple_amp_dai_init(device_t dev, uint32_t format) 121 { 122 123 return (0); 124 } 125 126 static int 127 simple_amp_dai_trigger(device_t dev, int go, int pcm_dir) 128 { 129 struct simple_amp_softc *sc; 130 int error; 131 132 if ((pcm_dir != PCMDIR_PLAY) && (pcm_dir != PCMDIR_REC)) 133 return (EINVAL); 134 135 sc = device_get_softc(dev); 136 error = 0; 137 switch (go) { 138 case PCMTRIG_START: 139 if (sc->supply_vcc != NULL) { 140 error = regulator_enable(sc->supply_vcc); 141 if (error != 0) { 142 device_printf(sc->dev, 143 "could not enable 'VCC' regulator\n"); 144 break; 145 } 146 } 147 148 if (sc->gpio_is_valid) { 149 error = gpio_pin_set_active(sc->gpio_enable, 1); 150 if (error != 0) { 151 device_printf(sc->dev, 152 "could not set 'gpio-enable' gpio\n"); 153 break; 154 } 155 } 156 157 break; 158 159 case PCMTRIG_STOP: 160 case PCMTRIG_ABORT: 161 if (sc->gpio_is_valid) { 162 error = gpio_pin_set_active(sc->gpio_enable, 0); 163 if (error != 0) { 164 device_printf(sc->dev, 165 "could not clear 'gpio-enable' gpio\n"); 166 break; 167 } 168 } 169 170 if (sc->supply_vcc != NULL) { 171 error = regulator_disable(sc->supply_vcc); 172 if (error != 0) { 173 device_printf(sc->dev, 174 "could not disable 'VCC' regulator\n"); 175 break; 176 } 177 } 178 179 break; 180 } 181 182 return (error); 183 } 184 185 static device_method_t simple_amp_methods[] = { 186 /* Device interface */ 187 DEVMETHOD(device_probe, simple_amp_probe), 188 DEVMETHOD(device_attach, simple_amp_attach), 189 DEVMETHOD(device_detach, simple_amp_detach), 190 191 DEVMETHOD(audio_dai_init, simple_amp_dai_init), 192 DEVMETHOD(audio_dai_trigger, simple_amp_dai_trigger), 193 194 DEVMETHOD_END 195 }; 196 197 static driver_t simple_amp_driver = { 198 "simpleamp", 199 simple_amp_methods, 200 sizeof(struct simple_amp_softc), 201 }; 202 203 static devclass_t simple_amp_devclass; 204 205 DRIVER_MODULE(simple_amp, simplebus, simple_amp_driver, simple_amp_devclass, 0, 0); 206 SIMPLEBUS_PNP_INFO(compat_data); 207