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[src/trunk]: src/sys Add a helper for exposing LED controls via sysctl.
details: https://anonhg.NetBSD.org/src/rev/a3b38e991515
branches: trunk
changeset: 825305:a3b38e991515
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sat Jul 08 00:54:37 2017 +0000
description:
Add a helper for exposing LED controls via sysctl.
diffstat:
sys/conf/files | 5 +-
sys/dev/led.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/led.h | 51 +++++++++++++++
3 files changed, 247 insertions(+), 1 deletions(-)
diffs (270 lines):
diff -r a482ef67f7b9 -r a3b38e991515 sys/conf/files
--- a/sys/conf/files Sat Jul 08 00:26:19 2017 +0000
+++ b/sys/conf/files Sat Jul 08 00:54:37 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files,v 1.1179 2017/06/22 16:46:53 flxd Exp $
+# $NetBSD: files,v 1.1180 2017/07/08 00:54:37 jmcneill Exp $
# @(#)files.newconf 7.5 (Berkeley) 5/10/93
version 20170615
@@ -1506,6 +1506,9 @@
# device-mapper driver for LVM
include "dev/dm/files.dm"
+# LED framework
+file dev/led.c leds
+
#
# File systems
#
diff -r a482ef67f7b9 -r a3b38e991515 sys/dev/led.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/led.c Sat Jul 08 00:54:37 2017 +0000
@@ -0,0 +1,192 @@
+/* $NetBSD: led.c,v 1.1 2017/07/08 00:54:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 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: led.c,v 1.1 2017/07/08 00:54:37 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+#include <sys/queue.h>
+#include <sys/sysctl.h>
+#include <sys/once.h>
+
+#include <dev/led.h>
+
+struct led_device {
+ char *name;
+ led_getstate_fn getstate;
+ led_setstate_fn setstate;
+ void *priv;
+
+ struct sysctllog *slog;
+
+ TAILQ_ENTRY(led_device) devices;
+};
+
+static TAILQ_HEAD(, led_device) led_devices =
+ TAILQ_HEAD_INITIALIZER(led_devices);
+static kmutex_t led_lock;
+
+static int
+led_init(void)
+{
+ mutex_init(&led_lock, MUTEX_DEFAULT, IPL_NONE);
+
+ return 0;
+}
+
+static struct led_device *
+led_lookup(const char *name)
+{
+ struct led_device *led;
+
+ KASSERT(mutex_owned(&led_lock));
+
+ TAILQ_FOREACH(led, &led_devices, devices)
+ if (strcmp(led->name, name) == 0)
+ return led;
+
+ return NULL;
+}
+
+static void
+led_normalize_name(char *name)
+{
+ char *p;
+
+ for (p = name; *p; p++)
+ if (!isalpha(*p) && !isdigit(*p) && *p != '-' && *p != '_')
+ *p = '_';
+}
+
+static void
+led_free(struct led_device *led)
+{
+ KASSERT(mutex_owned(&led_lock));
+
+ kmem_free(led->name, strlen(led->name) + 1);
+ kmem_free(led, sizeof(*led));
+}
+
+static int
+led_sysctl_handler(SYSCTLFN_ARGS)
+{
+ struct sysctlnode node;
+ struct led_device *led;
+ int error, state;
+
+ mutex_enter(&led_lock);
+
+ node = *rnode;
+ led = node.sysctl_data;
+ state = led->getstate(led->priv);
+ node.sysctl_data = &state;
+ error = sysctl_lookup(SYSCTLFN_CALL(&node));
+ if (error || newp == NULL) {
+ mutex_exit(&led_lock);
+ return error;
+ }
+
+ if (state < LED_STATE_OFF || state > LED_STATE_ON) {
+ mutex_exit(&led_lock);
+ return EINVAL;
+ }
+
+ led->setstate(led->priv, state);
+
+ mutex_exit(&led_lock);
+
+ return 0;
+}
+
+void *
+led_attach(const char *name, void *priv, led_getstate_fn getstate,
+ led_setstate_fn setstate)
+{
+ static ONCE_DECL(control);
+ struct led_device *led;
+ const struct sysctlnode *node;
+ int error;
+
+ if (RUN_ONCE(&control, led_init) != 0)
+ return NULL;
+
+ led = kmem_zalloc(sizeof(*led), KM_SLEEP);
+ led->name = kmem_asprintf("%s", name);
+ led->getstate = getstate;
+ led->setstate = setstate;
+ led->priv = priv;
+
+ /* Convert invalid sysctl node name characters to underscores */
+ led_normalize_name(led->name);
+
+ mutex_enter(&led_lock);
+ if (led_lookup(name) != NULL) {
+ led_free(led);
+ led = NULL;
+ } else {
+ error = sysctl_createv(&led->slog, 0, NULL, &node,
+ CTLFLAG_PERMANENT, CTLTYPE_NODE, "led", NULL,
+ NULL, 0, NULL, 0,
+ CTL_HW, CTL_CREATE, CTL_EOL);
+ if (error == 0) {
+ error = sysctl_createv(&led->slog, 0, &node, NULL,
+ CTLFLAG_READWRITE, CTLTYPE_BOOL, led->name, NULL,
+ led_sysctl_handler, 0,
+ (void *)led, 0,
+ CTL_CREATE, CTL_EOL);
+ }
+ if (error != 0) {
+ printf("led: failed to create sysctl hw.led.%s: %d\n",
+ led->name, error);
+ led_free(led);
+ led = NULL;
+ }
+ }
+ if (led != NULL)
+ TAILQ_INSERT_TAIL(&led_devices, led, devices);
+ mutex_exit(&led_lock);
+
+ return led;
+}
+
+void
+led_detach(void *handle)
+{
+ struct led_device *led = handle;
+
+ mutex_enter(&led_lock);
+
+ TAILQ_REMOVE(&led_devices, led, devices);
+ sysctl_teardown(&led->slog);
+ led_free(led);
+
+ mutex_exit(&led_lock);
+}
diff -r a482ef67f7b9 -r a3b38e991515 sys/dev/led.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/led.h Sat Jul 08 00:54:37 2017 +0000
@@ -0,0 +1,51 @@
+/* $NetBSD: led.h,v 1.1 2017/07/08 00:54:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef _DEV_LED_H
+#define _DEV_LED_H
+
+enum {
+ LED_STATE_OFF,
+ LED_STATE_ON
+};
+
+typedef int (*led_getstate_fn)(void *);
+typedef void (*led_setstate_fn)(void *, int);
+
+/*
+ * Attach an LED device. Returns an opaque handle on success and NULL
+ * on failure.
+ */
+void * led_attach(const char *, void *, led_getstate_fn, led_setstate_fn);
+
+/*
+ * Detach a previously attached LED device.
+ */
+void led_detach(void *);
+
+#endif /* !_DEV_LED_H */
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