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/* $OpenBSD: kern_sensors.c,v 1.33 2014/11/14 23:26:48 tedu Exp $ */
/*
* Copyright (c) 2005 David Gwynne <dlg@openbsd.org>
* Copyright (c) 2006 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/device.h>
#include <sys/hotplug.h>
#include <sys/timeout.h>
#include <sys/task.h>
#include <sys/rwlock.h>
#include <sys/sensors.h>
#include "hotplug.h"
struct taskq *sensors_taskq;
int sensordev_count;
SLIST_HEAD(, ksensordev) sensordev_list =
SLIST_HEAD_INITIALIZER(sensordev_list);
void
sensordev_install(struct ksensordev *sensdev)
{
struct ksensordev *v, *nv;
int s;
s = splhigh();
if (sensordev_count == 0) {
sensdev->num = 0;
SLIST_INSERT_HEAD(&sensordev_list, sensdev, list);
} else {
for (v = SLIST_FIRST(&sensordev_list);
(nv = SLIST_NEXT(v, list)) != NULL; v = nv)
if (nv->num - v->num > 1)
break;
sensdev->num = v->num + 1;
SLIST_INSERT_AFTER(v, sensdev, list);
}
sensordev_count++;
splx(s);
#if NHOTPLUG > 0
hotplug_device_attach(DV_DULL, "sensordev");
#endif
}
void
sensor_attach(struct ksensordev *sensdev, struct ksensor *sens)
{
struct ksensor *v, *nv;
struct ksensors_head *sh;
int s, i;
s = splhigh();
sh = &sensdev->sensors_list;
if (sensdev->sensors_count == 0) {
for (i = 0; i < SENSOR_MAX_TYPES; i++)
sensdev->maxnumt[i] = 0;
sens->numt = 0;
SLIST_INSERT_HEAD(sh, sens, list);
} else {
for (v = SLIST_FIRST(sh);
(nv = SLIST_NEXT(v, list)) != NULL; v = nv)
if (v->type == sens->type && (v->type != nv->type ||
(v->type == nv->type && nv->numt - v->numt > 1)))
break;
/* sensors of the same type go after each other */
if (v->type == sens->type)
sens->numt = v->numt + 1;
else
sens->numt = 0;
SLIST_INSERT_AFTER(v, sens, list);
}
/* we only increment maxnumt[] if the sensor was added
* to the last position of sensors of this type
*/
if (sensdev->maxnumt[sens->type] == sens->numt)
sensdev->maxnumt[sens->type]++;
sensdev->sensors_count++;
splx(s);
}
void
sensordev_deinstall(struct ksensordev *sensdev)
{
int s;
s = splhigh();
sensordev_count--;
SLIST_REMOVE(&sensordev_list, sensdev, ksensordev, list);
splx(s);
#if NHOTPLUG > 0
hotplug_device_detach(DV_DULL, "sensordev");
#endif
}
void
sensor_detach(struct ksensordev *sensdev, struct ksensor *sens)
{
struct ksensors_head *sh;
int s;
s = splhigh();
sh = &sensdev->sensors_list;
sensdev->sensors_count--;
SLIST_REMOVE(sh, sens, ksensor, list);
/* we only decrement maxnumt[] if this is the tail
* sensor of this type
*/
if (sens->numt == sensdev->maxnumt[sens->type] - 1)
sensdev->maxnumt[sens->type]--;
splx(s);
}
int
sensordev_get(int num, struct ksensordev **sensdev)
{
struct ksensordev *sd;
SLIST_FOREACH(sd, &sensordev_list, list) {
if (sd->num == num) {
*sensdev = sd;
return (0);
}
if (sd->num > num)
return (ENXIO);
}
return (ENOENT);
}
int
sensor_find(int dev, enum sensor_type type, int numt, struct ksensor **ksensorp)
{
struct ksensor *s;
struct ksensordev *sensdev;
struct ksensors_head *sh;
int ret;
ret = sensordev_get(dev, &sensdev);
if (ret)
return (ret);
sh = &sensdev->sensors_list;
SLIST_FOREACH(s, sh, list)
if (s->type == type && s->numt == numt) {
*ksensorp = s;
return (0);
}
return (ENOENT);
}
struct sensor_task {
void (*func)(void *);
void *arg;
unsigned int period;
struct timeout timeout;
struct task task;
struct rwlock lock;
};
void sensor_task_tick(void *);
void sensor_task_work(void *, void *);
struct sensor_task *
sensor_task_register(void *arg, void (*func)(void *), unsigned int period)
{
struct sensor_task *st;
#ifdef DIAGNOSTIC
if (period == 0)
panic("sensor_task_register: period is 0");
#endif
if (sensors_taskq == NULL &&
(sensors_taskq = taskq_create("sensors", 1, IPL_HIGH)) == NULL)
sensors_taskq = systq;
st = malloc(sizeof(*st), M_DEVBUF, M_NOWAIT);
if (st == NULL)
return (NULL);
st->func = func;
st->arg = arg;
st->period = period;
timeout_set(&st->timeout, sensor_task_tick, st);
task_set(&st->task, sensor_task_work, st, NULL);
rw_init(&st->lock, "sensor");
sensor_task_tick(st);
return (st);
}
void
sensor_task_unregister(struct sensor_task *st)
{
/*
* we can't reliably timeout_del or task_del because there's a window
* between when they come off the lists and the timeout or task code
* actually runs the respective handlers for them. mark the sensor_task
* as dying by setting period to 0 and let sensor_task_work mop up.
*/
rw_enter_write(&st->lock);
st->period = 0;
rw_exit_write(&st->lock);
}
void
sensor_task_tick(void *arg)
{
struct sensor_task *st = arg;
task_add(sensors_taskq, &st->task);
}
void
sensor_task_work(void *xst, void *arg)
{
struct sensor_task *st = xst;
unsigned int period = 0;
rw_enter_write(&st->lock);
period = st->period;
if (period > 0)
st->func(st->arg);
rw_exit_write(&st->lock);
if (period == 0)
free(st, M_DEVBUF, sizeof(*st));
else
timeout_add_sec(&st->timeout, period);
}
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