[src/trunk]: src/sys/dev/fdt Add driver for simple-audio-amplifier binding

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/853322e4b1ab
branches:  trunk
changeset: 466772:853322e4b1ab
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Thu Jan 02 00:57:09 2020 +0000

description:
Add driver for simple-audio-amplifier binding

diffstat:

 sys/dev/fdt/files.fdt          |    8 ++-
 sys/dev/fdt/simple_amplifier.c |  137 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+), 1 deletions(-)

diffs (160 lines):

diff -r dd377fc171a9 -r 853322e4b1ab sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt     Wed Jan 01 23:28:31 2020 +0000
+++ b/sys/dev/fdt/files.fdt     Thu Jan 02 00:57:09 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.49 2019/12/19 00:35:01 jakllsch Exp $
+# $NetBSD: files.fdt,v 1.50 2020/01/02 00:57:10 jmcneill Exp $
 
 include        "external/bsd/libfdt/conf/files.libfdt"
 
@@ -165,3 +165,9 @@
 device usbnopphy
 attach usbnopphy at fdt
 file   dev/fdt/usbnopphy.c                     usbnopphy
+
+# Simple Amplifier Audio Driver
+device simpleamp
+attach simpleamp at fdt
+file   dev/fdt/simple_amplifier.c              simpleamp
+
diff -r dd377fc171a9 -r 853322e4b1ab sys/dev/fdt/simple_amplifier.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/simple_amplifier.c    Thu Jan 02 00:57:09 2020 +0000
@@ -0,0 +1,137 @@
+/* $NetBSD: simple_amplifier.c,v 1.1 2020/01/02 00:57:09 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2020 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: simple_amplifier.c,v 1.1 2020/01/02 00:57:09 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/kmem.h>
+
+#include <dev/audio/audio_dai.h>
+
+#include <dev/fdt/fdtvar.h>
+
+struct simple_amplifier_softc {
+       device_t                sc_dev;
+       struct audio_dai_device sc_dai;
+       struct fdtbus_gpio_pin  *sc_pin;
+       struct fdtbus_regulator *sc_vcc;
+};
+
+static int     simple_amplifier_match(device_t, cfdata_t, void *);
+static void    simple_amplifier_attach(device_t, device_t, void *);
+
+static const char *compatible[] = {
+       "simple-audio-amplifier",
+       NULL
+};
+
+CFATTACH_DECL_NEW(simpleamp, sizeof(struct simple_amplifier_softc),
+       simple_amplifier_match, simple_amplifier_attach, NULL, NULL);
+
+static int
+simple_amplifier_open(void *priv, int flags)
+{
+       struct simple_amplifier_softc * const sc = priv;
+       int error;
+
+       if (sc->sc_pin != NULL)
+               fdtbus_gpio_write(sc->sc_pin, 1);
+
+       if (sc->sc_vcc != NULL) {
+               error = fdtbus_regulator_enable(sc->sc_vcc);
+               if (error != 0)
+                       aprint_error_dev(sc->sc_dev, "couldn't enable power supply\n");
+       }
+
+       return 0;
+}
+
+static void
+simple_amplifier_close(void *priv)
+{
+       struct simple_amplifier_softc * const sc = priv;
+
+       if (sc->sc_pin != NULL)
+               fdtbus_gpio_write(sc->sc_pin, 0);
+
+       if (sc->sc_vcc != NULL)
+               (void)fdtbus_regulator_disable(sc->sc_vcc);
+}
+
+static const struct audio_hw_if simple_amplifier_hw_if = {
+       .open = simple_amplifier_open,
+       .close = simple_amplifier_close,
+};
+
+static audio_dai_tag_t
+simple_amplifier_dai_get_tag(device_t dev, const void *data, size_t len)
+{
+       struct simple_amplifier_softc * const sc = device_private(dev);
+
+       if (len != 4)
+               return NULL;
+
+       return &sc->sc_dai;
+}
+
+static struct fdtbus_dai_controller_func simple_amplifier_dai_funcs = {
+       .get_tag = simple_amplifier_dai_get_tag
+};
+
+static int
+simple_amplifier_match(device_t parent, cfdata_t cf, void *aux)
+{
+       struct fdt_attach_args * const faa = aux;
+
+       return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+simple_amplifier_attach(device_t parent, device_t self, void *aux)
+{
+       struct simple_amplifier_softc * const sc = device_private(self);
+       struct fdt_attach_args * const faa = aux;
+       const int phandle = faa->faa_phandle;
+
+       sc->sc_dev = self;
+       sc->sc_pin = fdtbus_gpio_acquire(phandle, "enable-gpios", GPIO_PIN_OUTPUT);
+       sc->sc_vcc = fdtbus_regulator_acquire(phandle, "VCC-supply");
+
+       aprint_naive("\n");
+       aprint_normal(": Simple Amplifier\n");
+
+       sc->sc_dai.dai_hw_if = &simple_amplifier_hw_if;
+       sc->sc_dai.dai_dev = self;
+       sc->sc_dai.dai_priv = sc;
+       fdtbus_register_dai_controller(self, phandle, &simple_amplifier_dai_funcs);
+}