/* $NetBSD: led.c,v 1.3 2018/01/10 15:58:40 jakllsch Exp $ */

/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
* 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 1.3 2018/01/10 15:58:40 jakllsch 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)
{
       unsigned char *p;

       for (p = (unsigned char *)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;
       bool 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;
       }

       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);
}

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