1 /* $OpenBSD: kern_sensors.c,v 1.19 2007/06/04 18:42:05 deraadt Exp $ */
6 * Copyright (c) 2005 David Gwynne <dlg@openbsd.org>
7 * Copyright (c) 2006 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 #include <sys/param.h>
23 #include <sys/systm.h>
24 #include <sys/kernel.h>
25 #include <sys/malloc.h>
26 #include <sys/kthread.h>
27 #include <sys/queue.h>
28 #include <sys/types.h>
30 #include <sys/spinlock.h>
31 #include <sys/spinlock2.h>
34 #include <sys/sysctl.h>
35 #include <sys/sensors.h>
37 #include <sys/mplock2.h>
39 static struct lock sensor_task_lock =
40 LOCK_INITIALIZER("ksensor_task", 0, LK_CANRECURSE);
41 static struct spinlock sensor_dev_lock = SPINLOCK_INITIALIZER(sensor_dev_lock, "sensor_dev_lock");
43 int sensordev_count = 0;
44 SLIST_HEAD(, ksensordev) sensordev_list = SLIST_HEAD_INITIALIZER(sensordev_list);
46 static struct ksensordev *sensordev_get(int);
47 static struct ksensor *sensor_find(struct ksensordev *, enum sensor_type,
55 time_t nextrun; /* time_uptime */
57 TAILQ_ENTRY(sensor_task) entry;
60 static void sensor_task_thread(void *);
61 static void sensor_task_schedule(struct sensor_task *);
63 TAILQ_HEAD(, sensor_task) tasklist = TAILQ_HEAD_INITIALIZER(tasklist);
66 static void sensor_sysctl8magic_install(struct ksensordev *);
67 static void sensor_sysctl8magic_deinstall(struct ksensordev *);
71 sensordev_install(struct ksensordev *sensdev)
73 struct ksensordev *v, *nv;
75 /* mtx_lock(&Giant); */
76 spin_lock(&sensor_dev_lock);
77 if (sensordev_count == 0) {
79 SLIST_INSERT_HEAD(&sensordev_list, sensdev, list);
81 for (v = SLIST_FIRST(&sensordev_list);
82 (nv = SLIST_NEXT(v, list)) != NULL; v = nv)
83 if (nv->num - v->num > 1)
85 sensdev->num = v->num + 1;
86 SLIST_INSERT_AFTER(v, sensdev, list);
89 /* mtx_unlock(&Giant); */
90 spin_unlock(&sensor_dev_lock);
93 sensor_sysctl8magic_install(sensdev);
98 sensor_attach(struct ksensordev *sensdev, struct ksensor *sens)
100 struct ksensor *v, *nv;
101 struct ksensors_head *sh;
104 /* mtx_lock(&Giant); */
105 spin_lock(&sensor_dev_lock);
106 sh = &sensdev->sensors_list;
107 if (sensdev->sensors_count == 0) {
108 for (i = 0; i < SENSOR_MAX_TYPES; i++)
109 sensdev->maxnumt[i] = 0;
111 SLIST_INSERT_HEAD(sh, sens, list);
113 for (v = SLIST_FIRST(sh);
114 (nv = SLIST_NEXT(v, list)) != NULL; v = nv)
115 if (v->type == sens->type && (v->type != nv->type ||
116 (v->type == nv->type && nv->numt - v->numt > 1)))
118 /* sensors of the same type go after each other */
119 if (v->type == sens->type)
120 sens->numt = v->numt + 1;
123 SLIST_INSERT_AFTER(v, sens, list);
125 /* we only increment maxnumt[] if the sensor was added
126 * to the last position of sensors of this type
128 if (sensdev->maxnumt[sens->type] == sens->numt)
129 sensdev->maxnumt[sens->type]++;
130 sensdev->sensors_count++;
131 spin_unlock(&sensor_dev_lock);
132 /* mtx_unlock(&Giant); */
136 sensordev_deinstall(struct ksensordev *sensdev)
138 /* mtx_lock(&Giant); */
139 spin_lock(&sensor_dev_lock);
141 SLIST_REMOVE(&sensordev_list, sensdev, ksensordev, list);
142 /* mtx_unlock(&Giant); */
143 spin_unlock(&sensor_dev_lock);
145 #ifndef NOSYSCTL8HACK
146 sensor_sysctl8magic_deinstall(sensdev);
151 sensor_detach(struct ksensordev *sensdev, struct ksensor *sens)
153 struct ksensors_head *sh;
155 /* mtx_lock(&Giant); */
156 sh = &sensdev->sensors_list;
157 sensdev->sensors_count--;
158 SLIST_REMOVE(sh, sens, ksensor, list);
159 /* we only decrement maxnumt[] if this is the tail
160 * sensor of this type
162 if (sens->numt == sensdev->maxnumt[sens->type] - 1)
163 sensdev->maxnumt[sens->type]--;
164 /* mtx_unlock(&Giant); */
167 static struct ksensordev *
168 sensordev_get(int num)
170 struct ksensordev *sd;
172 spin_lock(&sensor_dev_lock);
173 SLIST_FOREACH(sd, &sensordev_list, list)
174 if (sd->num == num) {
175 spin_unlock(&sensor_dev_lock);
179 spin_unlock(&sensor_dev_lock);
183 static struct ksensor *
184 sensor_find(struct ksensordev *sensdev, enum sensor_type type, int numt)
187 struct ksensors_head *sh;
189 spin_lock(&sensor_dev_lock);
190 sh = &sensdev->sensors_list;
191 SLIST_FOREACH(s, sh, list) {
192 if (s->type == type && s->numt == numt) {
193 spin_unlock(&sensor_dev_lock);
198 spin_unlock(&sensor_dev_lock);
203 sensor_task_register(void *arg, void (*func)(void *), int period)
205 struct sensor_task *st;
206 int create_thread = 0;
208 st = kmalloc(sizeof(struct sensor_task), M_DEVBUF, M_NOWAIT);
212 lockmgr(&sensor_task_lock, LK_EXCLUSIVE);
219 if (TAILQ_EMPTY(&tasklist))
223 TAILQ_INSERT_HEAD(&tasklist, st, entry);
226 if (kthread_create(sensor_task_thread, NULL, NULL,
228 panic("sensors kthread");
232 lockmgr(&sensor_task_lock, LK_RELEASE);
237 sensor_task_unregister(void *arg)
239 struct sensor_task *st;
241 lockmgr(&sensor_task_lock, LK_EXCLUSIVE);
242 TAILQ_FOREACH(st, &tasklist, entry)
245 lockmgr(&sensor_task_lock, LK_RELEASE);
249 sensor_task_thread(void *arg)
251 struct sensor_task *st, *nst;
254 lockmgr(&sensor_task_lock, LK_EXCLUSIVE);
256 while (!TAILQ_EMPTY(&tasklist)) {
257 while ((nst = TAILQ_FIRST(&tasklist))->nextrun >
259 lksleep(&tasklist, &sensor_task_lock, 0, "timeout",
260 (nst->nextrun - now) * hz);
262 while ((st = nst) != NULL) {
263 nst = TAILQ_NEXT(st, entry);
265 if (st->nextrun > now)
268 /* take it out while we work on it */
269 TAILQ_REMOVE(&tasklist, st, entry);
278 /* stick it back in the tasklist */
279 sensor_task_schedule(st);
283 lockmgr(&sensor_task_lock, LK_RELEASE);
287 sensor_task_schedule(struct sensor_task *st)
289 struct sensor_task *cst;
291 lockmgr(&sensor_task_lock, LK_EXCLUSIVE);
292 st->nextrun = time_uptime + st->period;
294 TAILQ_FOREACH(cst, &tasklist, entry) {
295 if (cst->nextrun > st->nextrun) {
296 TAILQ_INSERT_BEFORE(cst, st, entry);
297 lockmgr(&sensor_task_lock, LK_RELEASE);
302 /* must be an empty list, or at the end of the list */
303 TAILQ_INSERT_TAIL(&tasklist, st, entry);
304 lockmgr(&sensor_task_lock, LK_RELEASE);
310 static int sysctl_handle_sensordev(SYSCTL_HANDLER_ARGS);
311 static int sysctl_handle_sensor(SYSCTL_HANDLER_ARGS);
312 static int sysctl_sensors_handler(SYSCTL_HANDLER_ARGS);
314 #ifndef NOSYSCTL8HACK
316 SYSCTL_NODE(_hw, OID_AUTO, sensors, CTLFLAG_RD, NULL,
317 "Hardware Sensors sysctl internal magic");
318 SYSCTL_NODE(_hw, HW_SENSORS, _sensors, CTLFLAG_RD, sysctl_sensors_handler,
319 "Hardware Sensors XP MIB interface");
321 #else /* NOSYSCTL8HACK */
323 SYSCTL_NODE(_hw, HW_SENSORS, sensors, CTLFLAG_RD, sysctl_sensors_handler,
325 int sensors_debug = 1;
326 SYSCTL_INT(_hw_sensors, OID_AUTO, debug, CTLFLAG_RD, &sensors_debug, 0, "sensors debug");
328 #endif /* !NOSYSCTL8HACK */
331 #ifndef NOSYSCTL8HACK
335 * FreeBSD's sysctl(9) .oid_handler functionality is not accustomed
336 * for the CTLTYPE_NODE handler to handle the undocumented sysctl
337 * magic calls. As soon as such functionality is developed,
338 * sysctl_sensors_handler() should be converted to handle all such
339 * calls, and these sysctl_add_oid(9) calls should be removed
340 * "with a big axe". This whole sysctl_add_oid(9) business is solely
341 * to please sysctl(8).
345 sensor_sysctl8magic_install(struct ksensordev *sensdev)
347 struct sysctl_oid_list *ol;
348 struct sysctl_ctx_list *cl = &sensdev->clist;
350 struct ksensors_head *sh = &sensdev->sensors_list;
353 ol = SYSCTL_CHILDREN(SYSCTL_ADD_NODE(cl, (&SYSCTL_NODE_CHILDREN(_hw,
354 sensors)), sensdev->num, sensdev->xname, CTLFLAG_RD, NULL, ""));
355 SLIST_FOREACH(s, sh, list) {
358 ksnprintf(n, sizeof(n), "%s%d", sensor_type_s[s->type], s->numt);
359 SYSCTL_ADD_PROC(cl, ol, OID_AUTO, n, CTLTYPE_STRUCT |
360 CTLFLAG_RD, s, 0, sysctl_handle_sensor, "S,sensor", "");
365 sensor_sysctl8magic_deinstall(struct ksensordev *sensdev)
367 struct sysctl_ctx_list *cl = &sensdev->clist;
372 #endif /* !NOSYSCTL8HACK */
376 sysctl_handle_sensordev(SYSCTL_HANDLER_ARGS)
378 struct ksensordev *ksd = arg1;
379 struct sensordev *usd;
385 /* Grab a copy, to clear the kernel pointers */
386 usd = kmalloc(sizeof(*usd), M_TEMP, M_WAITOK | M_ZERO);
388 strlcpy(usd->xname, ksd->xname, sizeof(usd->xname));
389 memcpy(usd->maxnumt, ksd->maxnumt, sizeof(usd->maxnumt));
390 usd->sensors_count = ksd->sensors_count;
392 error = SYSCTL_OUT(req, usd, sizeof(struct sensordev));
400 sysctl_handle_sensor(SYSCTL_HANDLER_ARGS)
402 struct ksensor *ks = arg1;
409 /* Grab a copy, to clear the kernel pointers */
410 us = kmalloc(sizeof(*us), M_TEMP, M_WAITOK | M_ZERO);
411 memcpy(us->desc, ks->desc, sizeof(ks->desc));
413 us->value = ks->value;
415 us->status = ks->status;
417 us->flags = ks->flags;
419 error = SYSCTL_OUT(req, us, sizeof(struct sensor));
426 sysctl_sensors_handler(SYSCTL_HANDLER_ARGS)
429 u_int namelen = arg2;
430 struct ksensordev *ksd;
433 enum sensor_type type;
435 if (namelen != 1 && namelen != 3)
439 if ((ksd = sensordev_get(dev)) == NULL)
443 return (sysctl_handle_sensordev(NULL, ksd, 0, req));
448 if ((ks = sensor_find(ksd, type, numt)) == NULL)
450 return (sysctl_handle_sensor(NULL, ks, 0, req));