1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 28 #include <sys/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/module.h> 35 #include <sys/mutex.h> 36 #include <sys/rman.h> 37 #include <sys/resource.h> 38 #include <machine/bus.h> 39 40 #include <dev/ofw/ofw_bus.h> 41 #include <dev/ofw/ofw_bus_subr.h> 42 43 #include <dev/extres/regulator/regulator.h> 44 #include <dev/gpio/gpiobusvar.h> 45 46 #include "opt_snd.h" 47 #include <dev/sound/pcm/sound.h> 48 #include <dev/sound/fdt/audio_dai.h> 49 #include "audio_dai_if.h" 50 51 static struct ofw_compat_data compat_data[] = { 52 { "simple-audio-amplifier", 1}, 53 { NULL, 0} 54 }; 55 56 struct simple_amp_softc { 57 device_t dev; 58 regulator_t supply_vcc; 59 gpio_pin_t gpio_enable; 60 bool gpio_is_valid; 61 }; 62 63 static int simple_amp_probe(device_t dev); 64 static int simple_amp_attach(device_t dev); 65 static int simple_amp_detach(device_t dev); 66 67 static int 68 simple_amp_probe(device_t dev) 69 { 70 if (!ofw_bus_status_okay(dev)) 71 return (ENXIO); 72 73 if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) 74 return (ENXIO); 75 76 device_set_desc(dev, "Simple Amplifier"); 77 return (BUS_PROBE_DEFAULT); 78 } 79 80 static int 81 simple_amp_attach(device_t dev) 82 { 83 struct simple_amp_softc *sc; 84 phandle_t node; 85 int error; 86 87 sc = device_get_softc(dev); 88 sc->dev = dev; 89 node = ofw_bus_get_node(dev); 90 91 error = gpio_pin_get_by_ofw_property(dev, node, 92 "enable-gpios", &sc->gpio_enable); 93 if (error != 0) 94 sc->gpio_is_valid = false; 95 else 96 sc->gpio_is_valid = true; 97 98 error = regulator_get_by_ofw_property(dev, 0, "VCC-supply", 99 &sc->supply_vcc); 100 if (error != 0) 101 device_printf(dev, "no VCC supply"); 102 103 OF_device_register_xref(OF_xref_from_node(node), dev); 104 105 return (0); 106 } 107 108 static int 109 simple_amp_detach(device_t dev) 110 { 111 112 return (0); 113 } 114 115 static int 116 simple_amp_dai_init(device_t dev, uint32_t format) 117 { 118 119 return (0); 120 } 121 122 static int 123 simple_amp_dai_trigger(device_t dev, int go, int pcm_dir) 124 { 125 struct simple_amp_softc *sc; 126 int error; 127 128 if ((pcm_dir != PCMDIR_PLAY) && (pcm_dir != PCMDIR_REC)) 129 return (EINVAL); 130 131 sc = device_get_softc(dev); 132 error = 0; 133 switch (go) { 134 case PCMTRIG_START: 135 if (sc->supply_vcc != NULL) { 136 error = regulator_enable(sc->supply_vcc); 137 if (error != 0) { 138 device_printf(sc->dev, 139 "could not enable 'VCC' regulator\n"); 140 break; 141 } 142 } 143 144 if (sc->gpio_is_valid) { 145 error = gpio_pin_set_active(sc->gpio_enable, 1); 146 if (error != 0) { 147 device_printf(sc->dev, 148 "could not set 'gpio-enable' gpio\n"); 149 break; 150 } 151 } 152 153 break; 154 155 case PCMTRIG_STOP: 156 case PCMTRIG_ABORT: 157 if (sc->gpio_is_valid) { 158 error = gpio_pin_set_active(sc->gpio_enable, 0); 159 if (error != 0) { 160 device_printf(sc->dev, 161 "could not clear 'gpio-enable' gpio\n"); 162 break; 163 } 164 } 165 166 if (sc->supply_vcc != NULL) { 167 error = regulator_disable(sc->supply_vcc); 168 if (error != 0) { 169 device_printf(sc->dev, 170 "could not disable 'VCC' regulator\n"); 171 break; 172 } 173 } 174 175 break; 176 } 177 178 return (error); 179 } 180 181 static device_method_t simple_amp_methods[] = { 182 /* Device interface */ 183 DEVMETHOD(device_probe, simple_amp_probe), 184 DEVMETHOD(device_attach, simple_amp_attach), 185 DEVMETHOD(device_detach, simple_amp_detach), 186 187 DEVMETHOD(audio_dai_init, simple_amp_dai_init), 188 DEVMETHOD(audio_dai_trigger, simple_amp_dai_trigger), 189 190 DEVMETHOD_END 191 }; 192 193 static driver_t simple_amp_driver = { 194 "simpleamp", 195 simple_amp_methods, 196 sizeof(struct simple_amp_softc), 197 }; 198 199 DRIVER_MODULE(simple_amp, simplebus, simple_amp_driver, 0, 0); 200 SIMPLEBUS_PNP_INFO(compat_data); 201