1 /* $OpenBSD: kern_sensors.c,v 1.19 2007/06/04 18:42:05 deraadt Exp $ */
4 * Copyright (c) 2005 David Gwynne <dlg@openbsd.org>
5 * Copyright (c) 2006 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <sys/param.h>
21 #include <sys/systm.h>
22 #include <sys/kernel.h>
23 #include <sys/malloc.h>
24 #include <sys/kthread.h>
25 #include <sys/queue.h>
26 #include <sys/types.h>
30 #include <sys/sysctl.h>
31 #include <sys/sensors.h>
33 int sensordev_count = 0;
34 SLIST_HEAD(, ksensordev) sensordev_list = SLIST_HEAD_INITIALIZER(sensordev_list);
36 struct ksensordev *sensordev_get(int);
37 struct ksensor *sensor_find(struct ksensordev *, enum sensor_type, int);
46 TAILQ_ENTRY(sensor_task) entry;
49 void sensor_task_thread(void *);
50 void sensor_task_schedule(struct sensor_task *);
52 TAILQ_HEAD(, sensor_task) tasklist = TAILQ_HEAD_INITIALIZER(tasklist);
55 void sensor_sysctl8magic_install(struct ksensordev *);
56 void sensor_sysctl8magic_deinstall(struct ksensordev *);
60 sensordev_install(struct ksensordev *sensdev)
62 struct ksensordev *v, *nv;
64 /* mtx_lock(&Giant); */
65 if (sensordev_count == 0) {
67 SLIST_INSERT_HEAD(&sensordev_list, sensdev, list);
69 for (v = SLIST_FIRST(&sensordev_list);
70 (nv = SLIST_NEXT(v, list)) != NULL; v = nv)
71 if (nv->num - v->num > 1)
73 sensdev->num = v->num + 1;
74 SLIST_INSERT_AFTER(v, sensdev, list);
77 /* mtx_unlock(&Giant); */
80 sensor_sysctl8magic_install(sensdev);
85 sensor_attach(struct ksensordev *sensdev, struct ksensor *sens)
87 struct ksensor *v, *nv;
88 struct ksensors_head *sh;
91 /* mtx_lock(&Giant); */
92 sh = &sensdev->sensors_list;
93 if (sensdev->sensors_count == 0) {
94 for (i = 0; i < SENSOR_MAX_TYPES; i++)
95 sensdev->maxnumt[i] = 0;
97 SLIST_INSERT_HEAD(sh, sens, list);
99 for (v = SLIST_FIRST(sh);
100 (nv = SLIST_NEXT(v, list)) != NULL; v = nv)
101 if (v->type == sens->type && (v->type != nv->type ||
102 (v->type == nv->type && nv->numt - v->numt > 1)))
104 /* sensors of the same type go after each other */
105 if (v->type == sens->type)
106 sens->numt = v->numt + 1;
109 SLIST_INSERT_AFTER(v, sens, list);
111 /* we only increment maxnumt[] if the sensor was added
112 * to the last position of sensors of this type
114 if (sensdev->maxnumt[sens->type] == sens->numt)
115 sensdev->maxnumt[sens->type]++;
116 sensdev->sensors_count++;
117 /* mtx_unlock(&Giant); */
121 sensordev_deinstall(struct ksensordev *sensdev)
123 /* mtx_lock(&Giant); */
125 SLIST_REMOVE(&sensordev_list, sensdev, ksensordev, list);
126 /* mtx_unlock(&Giant); */
128 #ifndef NOSYSCTL8HACK
129 sensor_sysctl8magic_deinstall(sensdev);
134 sensor_detach(struct ksensordev *sensdev, struct ksensor *sens)
136 struct ksensors_head *sh;
138 /* mtx_lock(&Giant); */
139 sh = &sensdev->sensors_list;
140 sensdev->sensors_count--;
141 SLIST_REMOVE(sh, sens, ksensor, list);
142 /* we only decrement maxnumt[] if this is the tail
143 * sensor of this type
145 if (sens->numt == sensdev->maxnumt[sens->type] - 1)
146 sensdev->maxnumt[sens->type]--;
147 /* mtx_unlock(&Giant); */
151 sensordev_get(int num)
153 struct ksensordev *sd;
155 SLIST_FOREACH(sd, &sensordev_list, list)
163 sensor_find(struct ksensordev *sensdev, enum sensor_type type, int numt)
166 struct ksensors_head *sh;
168 sh = &sensdev->sensors_list;
169 SLIST_FOREACH(s, sh, list)
170 if (s->type == type && s->numt == numt)
177 sensor_task_register(void *arg, void (*func)(void *), int period)
179 struct sensor_task *st;
180 int create_thread = 0;
182 st = kmalloc(sizeof(struct sensor_task), M_DEVBUF, M_NOWAIT);
192 if (TAILQ_EMPTY(&tasklist))
196 TAILQ_INSERT_HEAD(&tasklist, st, entry);
199 if (kthread_create(sensor_task_thread, NULL, NULL, 0, 0,
201 panic("sensors kthread");
209 sensor_task_unregister(void *arg)
211 struct sensor_task *st;
213 TAILQ_FOREACH(st, &tasklist, entry)
219 sensor_task_thread(void *arg)
221 struct sensor_task *st, *nst;
224 while (!TAILQ_EMPTY(&tasklist)) {
225 while ((nst = TAILQ_FIRST(&tasklist))->nextrun >
227 tsleep(&tasklist, 0, "timeout",
228 (nst->nextrun - now) * hz);
230 while ((st = nst) != NULL) {
231 nst = TAILQ_NEXT(st, entry);
233 if (st->nextrun > now)
236 /* take it out while we work on it */
237 TAILQ_REMOVE(&tasklist, st, entry);
246 /* stick it back in the tasklist */
247 sensor_task_schedule(st);
255 sensor_task_schedule(struct sensor_task *st)
257 struct sensor_task *cst;
259 st->nextrun = time_second + st->period;
261 TAILQ_FOREACH(cst, &tasklist, entry) {
262 if (cst->nextrun > st->nextrun) {
263 TAILQ_INSERT_BEFORE(cst, st, entry);
268 /* must be an empty list, or at the end of the list */
269 TAILQ_INSERT_TAIL(&tasklist, st, entry);
275 int sysctl_handle_sensordev(SYSCTL_HANDLER_ARGS);
276 int sysctl_handle_sensor(SYSCTL_HANDLER_ARGS);
277 int sysctl_sensors_handler(SYSCTL_HANDLER_ARGS);
279 #ifndef NOSYSCTL8HACK
281 SYSCTL_NODE(_hw, OID_AUTO, sensors, CTLFLAG_RD, NULL,
282 "Hardware Sensors sysctl internal magic");
283 SYSCTL_NODE(_hw, HW_SENSORS, _sensors, CTLFLAG_RD, sysctl_sensors_handler,
284 "Hardware Sensors XP MIB interface");
286 #else /* NOSYSCTL8HACK */
288 SYSCTL_NODE(_hw, HW_SENSORS, sensors, CTLFLAG_RD, sysctl_sensors_handler,
290 int sensors_debug = 1;
291 SYSCTL_INT(_hw_sensors, OID_AUTO, debug, CTLFLAG_RD, &sensors_debug, 0, "sensors debug");
293 #endif /* !NOSYSCTL8HACK */
296 #ifndef NOSYSCTL8HACK
300 * FreeBSD's sysctl(9) .oid_handler functionality is not accustomed
301 * for the CTLTYPE_NODE handler to handle the undocumented sysctl
302 * magic calls. As soon as such functionality is developed,
303 * sysctl_sensors_handler() should be converted to handle all such
304 * calls, and these sysctl_add_oid(9) calls should be removed
305 * "with a big axe". This whole sysctl_add_oid(9) business is solely
306 * to please sysctl(8).
310 sensor_sysctl8magic_install(struct ksensordev *sensdev)
312 struct sysctl_oid_list *ol;
313 struct sysctl_ctx_list *cl = &sensdev->clist;
315 struct ksensors_head *sh = &sensdev->sensors_list;
318 ol = SYSCTL_CHILDREN(SYSCTL_ADD_NODE(cl, (&SYSCTL_NODE_CHILDREN(_hw,
319 sensors)), sensdev->num, sensdev->xname, CTLFLAG_RD, NULL, ""));
320 SLIST_FOREACH(s, sh, list) {
323 ksnprintf(n, sizeof(n), "%s%d", sensor_type_s[s->type], s->numt);
324 SYSCTL_ADD_PROC(cl, ol, OID_AUTO, n, CTLTYPE_STRUCT |
325 CTLFLAG_RD, s, 0, sysctl_handle_sensor, "S,sensor", "");
330 sensor_sysctl8magic_deinstall(struct ksensordev *sensdev)
332 struct sysctl_ctx_list *cl = &sensdev->clist;
337 #endif /* !NOSYSCTL8HACK */
341 sysctl_handle_sensordev(SYSCTL_HANDLER_ARGS)
343 struct ksensordev *ksd = arg1;
344 struct sensordev *usd;
350 /* Grab a copy, to clear the kernel pointers */
351 usd = kmalloc(sizeof(*usd), M_TEMP, M_WAITOK | M_ZERO);
353 strlcpy(usd->xname, ksd->xname, sizeof(usd->xname));
354 memcpy(usd->maxnumt, ksd->maxnumt, sizeof(usd->maxnumt));
355 usd->sensors_count = ksd->sensors_count;
357 error = SYSCTL_OUT(req, usd, sizeof(struct sensordev));
365 sysctl_handle_sensor(SYSCTL_HANDLER_ARGS)
367 struct ksensor *ks = arg1;
374 /* Grab a copy, to clear the kernel pointers */
375 us = kmalloc(sizeof(*us), M_TEMP, M_WAITOK | M_ZERO);
376 memcpy(us->desc, ks->desc, sizeof(ks->desc));
378 us->value = ks->value;
380 us->status = ks->status;
382 us->flags = ks->flags;
384 error = SYSCTL_OUT(req, us, sizeof(struct sensor));
391 sysctl_sensors_handler(SYSCTL_HANDLER_ARGS)
394 u_int namelen = arg2;
395 struct ksensordev *ksd;
398 enum sensor_type type;
400 if (namelen != 1 && namelen != 3)
404 if ((ksd = sensordev_get(dev)) == NULL)
408 return (sysctl_handle_sensordev(NULL, ksd, 0, req));
413 if ((ks = sensor_find(ksd, type, numt)) == NULL)
415 return (sysctl_handle_sensor(NULL, ks, 0, req));