svn commit: r286089 - in head/sys: conf dev/gpio
Oleksandr Tymoshenko
gonzo at FreeBSD.org
Thu Jul 30 19:04:16 UTC 2015
Author: gonzo
Date: Thu Jul 30 19:04:14 2015
New Revision: 286089
URL: https://svnweb.freebsd.org/changeset/base/286089
Log:
Add GPIO backlight driver compatible with Linux FDT bindings.
Brightness is controlled through sysctl dev.gpiobacklight.X.brightness:
- any value greater than 0: backlight is on
- any value less than or equal to 0: backlight is off
FDT bindings docs in Linux tree:
Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
Added:
head/sys/dev/gpio/gpiobacklight.c (contents, props changed)
Modified:
head/sys/conf/files
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Thu Jul 30 18:59:01 2015 (r286088)
+++ head/sys/conf/files Thu Jul 30 19:04:14 2015 (r286089)
@@ -1436,6 +1436,7 @@ dev/fxp/inphy.c optional fxp
dev/gem/if_gem.c optional gem
dev/gem/if_gem_pci.c optional gem pci
dev/gem/if_gem_sbus.c optional gem sbus
+dev/gpio/gpiobacklight.c optional gpiobacklight fdt
dev/gpio/gpiobus.c optional gpio \
dependency "gpiobus_if.h"
dev/gpio/gpioc.c optional gpio \
Added: head/sys/dev/gpio/gpiobacklight.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/gpio/gpiobacklight.c Thu Jul 30 19:04:14 2015 (r286089)
@@ -0,0 +1,211 @@
+/*-
+ * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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>
+__FBSDID("$FreeBSD$");
+
+#include "opt_platform.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/sysctl.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+
+#include <dev/gpio/gpiobusvar.h>
+
+#include "gpiobus_if.h"
+
+/*
+ * Only one pin for led
+ */
+#define GPIOBL_PIN 0
+
+#define GPIOBL_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
+#define GPIOBL_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
+#define GPIOBL_LOCK_INIT(_sc) \
+ mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
+ "gpiobacklight", MTX_DEF)
+#define GPIOBL_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
+
+struct gpiobacklight_softc
+{
+ device_t sc_dev;
+ device_t sc_busdev;
+ struct mtx sc_mtx;
+
+ struct sysctl_oid *sc_oid;
+ int sc_brightness;
+};
+
+static int gpiobacklight_sysctl(SYSCTL_HANDLER_ARGS);
+static void gpiobacklight_update_brightness(struct gpiobacklight_softc *);
+static int gpiobacklight_probe(device_t);
+static int gpiobacklight_attach(device_t);
+static int gpiobacklight_detach(device_t);
+
+static void
+gpiobacklight_update_brightness(struct gpiobacklight_softc *sc)
+{
+ int error;
+
+ GPIOBL_LOCK(sc);
+ error = GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev,
+ GPIOBUS_DONTWAIT);
+ if (error != 0) {
+ GPIOBL_UNLOCK(sc);
+ return;
+ }
+ error = GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev,
+ GPIOBL_PIN, GPIO_PIN_OUTPUT);
+ if (error == 0)
+ GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOBL_PIN,
+ sc->sc_brightness ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
+ GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
+ GPIOBL_UNLOCK(sc);
+}
+
+static int
+gpiobacklight_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct gpiobacklight_softc *sc;
+ int error;
+ int brightness;
+
+ sc = (struct gpiobacklight_softc*)arg1;
+ brightness = sc->sc_brightness;
+ error = sysctl_handle_int(oidp, &brightness, 0, req);
+
+ if (error != 0 || req->newptr == NULL)
+ return (error);
+
+ if (brightness <= 0)
+ sc->sc_brightness = 0;
+ else
+ sc->sc_brightness = 1;
+
+ gpiobacklight_update_brightness(sc);
+
+ return (error);
+}
+
+static void
+gpiobacklight_identify(driver_t *driver, device_t bus)
+{
+ phandle_t node, root;
+
+ root = OF_finddevice("/");
+ if (root == 0)
+ return;
+ for (node = OF_child(root); node != 0; node = OF_peer(node)) {
+ if (!fdt_is_compatible_strict(node, "gpio-backlight"))
+ continue;
+ ofw_gpiobus_add_fdt_child(bus, driver->name, node);
+ }
+}
+
+static int
+gpiobacklight_probe(device_t dev)
+{
+
+ if (!ofw_bus_is_compatible(dev, "gpio-backlight"))
+ return (ENXIO);
+
+ device_set_desc(dev, "GPIO backlight");
+
+ return (0);
+}
+
+static int
+gpiobacklight_attach(device_t dev)
+{
+ struct gpiobacklight_softc *sc;
+ struct sysctl_ctx_list *ctx;
+ struct sysctl_oid *tree;
+ phandle_t node;
+
+ sc = device_get_softc(dev);
+ sc->sc_dev = dev;
+ sc->sc_busdev = device_get_parent(dev);
+
+ if ((node = ofw_bus_get_node(dev)) == -1)
+ return (ENXIO);
+
+ GPIOBL_LOCK_INIT(sc);
+ if (OF_hasprop(node, "default-on"))
+ sc->sc_brightness = 1;
+ else
+ sc->sc_brightness = 0;
+
+ /* Init backlight interface */
+ ctx = device_get_sysctl_ctx(sc->sc_dev);
+ tree = device_get_sysctl_tree(sc->sc_dev);
+ sc->sc_oid = SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
+ "brightness", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
+ gpiobacklight_sysctl, "I", "backlight brightness");
+
+ gpiobacklight_update_brightness(sc);
+
+ return (0);
+}
+
+static int
+gpiobacklight_detach(device_t dev)
+{
+ struct gpiobacklight_softc *sc;
+
+ sc = device_get_softc(dev);
+ GPIOBL_LOCK_DESTROY(sc);
+ return (0);
+}
+
+static devclass_t gpiobacklight_devclass;
+
+static device_method_t gpiobacklight_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_identify, gpiobacklight_identify),
+ DEVMETHOD(device_probe, gpiobacklight_probe),
+ DEVMETHOD(device_attach, gpiobacklight_attach),
+ DEVMETHOD(device_detach, gpiobacklight_detach),
+
+ DEVMETHOD_END
+};
+
+static driver_t gpiobacklight_driver = {
+ "gpiobacklight",
+ gpiobacklight_methods,
+ sizeof(struct gpiobacklight_softc),
+};
+
+DRIVER_MODULE(gpiobacklight, gpiobus, gpiobacklight_driver, gpiobacklight_devclass, 0, 0);
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