simple_amplifier.c

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    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 DRIVER_MODULE(simple_amp, simplebus, simple_amp_driver, 0, 0);
  204 SIMPLEBUS_PNP_INFO(compat_data);

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FreeBSD/Linux Kernel Cross Reference sys/dev/sound/fdt/simple_amplifier.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/fdt/simple_amplifier.c