2 * Copyright (c) 2005 Nate Lawson
3 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
36 #include <sys/ioccom.h>
37 #include <sys/sysctl.h>
39 #include <contrib/dev/acpica/include/acpi.h>
41 #include <dev/acpica/acpivar.h>
42 #include <dev/acpica/acpiio.h>
44 /* Default seconds before re-sampling the battery state. */
45 #define ACPI_BATTERY_INFO_EXPIRE 5
47 static int acpi_batteries_initted;
48 static int acpi_battery_info_expire = ACPI_BATTERY_INFO_EXPIRE;
49 static struct acpi_battinfo acpi_battery_battinfo;
50 static struct sysctl_ctx_list acpi_battery_sysctl_ctx;
51 static struct sysctl_oid *acpi_battery_sysctl_tree;
53 ACPI_SERIAL_DECL(battery, "ACPI generic battery");
55 static void acpi_reset_battinfo(struct acpi_battinfo *info);
56 static void acpi_battery_clean_str(char *str, int len);
57 static device_t acpi_battery_find_dev(u_int logical_unit);
58 static int acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg);
59 static int acpi_battery_sysctl(SYSCTL_HANDLER_ARGS);
60 static int acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS);
61 static int acpi_battery_init(void);
64 acpi_battery_register(device_t dev)
69 ACPI_SERIAL_BEGIN(battery);
70 if (!acpi_batteries_initted)
71 error = acpi_battery_init();
72 ACPI_SERIAL_END(battery);
77 acpi_battery_remove(device_t dev)
84 acpi_battery_get_units(void)
88 batt_dc = devclass_find("battery");
91 return (devclass_get_count(batt_dc));
95 acpi_battery_get_info_expire(void)
98 return (acpi_battery_info_expire);
101 /* Check _BST results for validity. */
103 acpi_battery_bst_valid(struct acpi_bst *bst)
105 return (bst->state < ACPI_BATT_STAT_MAX && bst->cap != ACPI_BATT_UNKNOWN &&
106 bst->volt != ACPI_BATT_UNKNOWN);
109 /* Check _BIF results for validity. */
111 acpi_battery_bif_valid(struct acpi_bif *bif)
113 return (bif->lfcap != 0);
116 /* Get info about one or all batteries. */
118 acpi_battery_get_battinfo(device_t dev, struct acpi_battinfo *battinfo)
120 int batt_stat, devcount, dev_idx, error, i;
121 int total_cap, total_min, valid_rate, valid_units;
124 struct acpi_bst *bst;
125 struct acpi_bif *bif;
126 struct acpi_battinfo *bi;
129 * Get the battery devclass and max unit for battery devices. If there
130 * are none or error, return immediately.
132 batt_dc = devclass_find("battery");
135 devcount = devclass_get_maxunit(batt_dc);
140 * Allocate storage for all _BST data, their derived battinfo data,
141 * and the current battery's _BIF data.
143 bst = malloc(devcount * sizeof(*bst), M_TEMP, M_WAITOK | M_ZERO);
144 bi = malloc(devcount * sizeof(*bi), M_TEMP, M_WAITOK | M_ZERO);
145 bif = malloc(sizeof(*bif), M_TEMP, M_WAITOK | M_ZERO);
148 * Pass 1: for each battery that is present and valid, get its status,
149 * calculate percent capacity remaining, and sum all the current
153 batt_stat = valid_rate = valid_units = 0;
154 for (i = 0; i < devcount; i++) {
155 /* Default info for every battery is "not present". */
156 acpi_reset_battinfo(&bi[i]);
159 * Find the device. Since devcount is in terms of max units, this
160 * may be a sparse array so skip devices that aren't present.
162 batt_dev = devclass_get_device(batt_dc, i);
163 if (batt_dev == NULL)
166 /* If examining a specific battery and this is it, record its index. */
167 if (dev != NULL && dev == batt_dev)
171 * Be sure we can get various info from the battery. Note that
172 * acpi_BatteryIsPresent() is not enough because smart batteries only
173 * return that the device is present.
175 if (!acpi_BatteryIsPresent(batt_dev) ||
176 ACPI_BATT_GET_STATUS(batt_dev, &bst[i]) != 0 ||
177 ACPI_BATT_GET_INFO(batt_dev, bif) != 0)
180 /* If a battery is not installed, we sometimes get strange values. */
181 if (!acpi_battery_bst_valid(&bst[i]) ||
182 !acpi_battery_bif_valid(bif))
186 * Record current state. If both charging and discharging are set,
187 * ignore the charging flag.
190 if ((bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
191 bst[i].state &= ~ACPI_BATT_STAT_CHARGING;
192 batt_stat |= bst[i].state;
193 bi[i].state = bst[i].state;
196 * If the battery info is in terms of mA, convert to mW by
197 * multiplying by the design voltage. If the design voltage
198 * is 0 (due to some error reading the battery), skip this
201 if (bif->units == ACPI_BIF_UNITS_MA && bif->dvol != 0 && dev == NULL) {
202 bst[i].rate = (bst[i].rate * bif->dvol) / 1000;
203 bst[i].cap = (bst[i].cap * bif->dvol) / 1000;
204 bif->lfcap = (bif->lfcap * bif->dvol) / 1000;
207 /* Calculate percent capacity remaining. */
208 bi[i].cap = (100 * bst[i].cap) / bif->lfcap;
211 * Some laptops report the "design-capacity" instead of the
212 * "real-capacity" when the battery is fully charged. That breaks
213 * the above arithmetic as it needs to be 100% maximum.
219 * On systems with more than one battery, they may get used
220 * sequentially, thus bst.rate may only signify the one currently
221 * in use. For the remaining batteries, bst.rate will be zero,
222 * which makes it impossible to calculate the total remaining time.
223 * Therefore, we sum the bst.rate for batteries in the discharging
224 * state and use the sum to calculate the total remaining time.
226 if (bst[i].rate != ACPI_BATT_UNKNOWN &&
227 (bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
228 valid_rate += bst[i].rate;
231 /* If the caller asked for a device but we didn't find it, error. */
232 if (dev != NULL && dev_idx == -1) {
237 /* Pass 2: calculate capacity and remaining time for all batteries. */
238 total_cap = total_min = 0;
239 for (i = 0; i < devcount; i++) {
241 * If any batteries are discharging, use the sum of the bst.rate
242 * values. Otherwise, we are on AC power, and there is infinite
243 * time remaining for this battery until we go offline.
246 bi[i].min = (60 * bst[i].cap) / valid_rate;
249 total_min += bi[i].min;
251 /* If this battery is not present, don't use its capacity. */
253 total_cap += bi[i].cap;
257 * Return total battery percent and time remaining. If there are
258 * no valid batteries, report values as unknown.
260 if (valid_units > 0) {
262 battinfo->cap = total_cap / valid_units;
263 battinfo->min = total_min;
264 battinfo->state = batt_stat;
265 battinfo->rate = valid_rate;
267 battinfo->cap = bi[dev_idx].cap;
268 battinfo->min = bi[dev_idx].min;
269 battinfo->state = bi[dev_idx].state;
270 battinfo->rate = bst[dev_idx].rate;
274 * If the queried battery has no discharge rate or is charging,
275 * report that we don't know the remaining time.
277 if (valid_rate == 0 || (battinfo->state & ACPI_BATT_STAT_CHARGING))
280 acpi_reset_battinfo(battinfo);
295 acpi_reset_battinfo(struct acpi_battinfo *info)
299 info->state = ACPI_BATT_STAT_NOT_PRESENT;
303 /* Make string printable, removing invalid chars. */
305 acpi_battery_clean_str(char *str, int len)
309 for (i = 0; i < len && *str != '\0'; i++, str++) {
314 /* NUL-terminate the string if we reached the end. */
320 * The battery interface deals with devices and methods but userland
321 * expects a logical unit number. Convert a logical unit to a device_t.
324 acpi_battery_find_dev(u_int logical_unit)
326 int found_unit, i, maxunit;
333 batt_dc = devclass_find("battery");
334 maxunit = devclass_get_maxunit(batt_dc);
335 for (i = 0; i < maxunit; i++) {
336 dev = devclass_get_device(batt_dc, i);
339 if (logical_unit == found_unit)
350 acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg)
352 union acpi_battery_ioctl_arg *ioctl_arg;
356 /* For commands that use the ioctl_arg struct, validate it first. */
361 if (IOCPARM_LEN(cmd) == sizeof(*ioctl_arg)) {
362 ioctl_arg = (union acpi_battery_ioctl_arg *)addr;
363 unit = ioctl_arg->unit;
364 if (unit != ACPI_BATTERY_ALL_UNITS)
365 dev = acpi_battery_find_dev(unit);
369 * No security check required: information retrieval only. If
370 * new functions are added here, a check might be required.
373 case ACPIIO_BATT_GET_UNITS:
375 *(int *)addr = acpi_battery_get_units();
379 case ACPIIO_BATT_GET_BATTINFO:
380 if (dev != NULL || unit == ACPI_BATTERY_ALL_UNITS) {
381 bzero(&ioctl_arg->battinfo, sizeof(ioctl_arg->battinfo));
383 error = acpi_battery_get_battinfo(dev, &ioctl_arg->battinfo);
387 case ACPIIO_BATT_GET_BIF:
389 bzero(&ioctl_arg->bif, sizeof(ioctl_arg->bif));
390 error = ACPI_BATT_GET_INFO(dev, &ioctl_arg->bif);
393 * Remove invalid characters. Perhaps this should be done
394 * within a convenience function so all callers get the
397 acpi_battery_clean_str(ioctl_arg->bif.model,
398 sizeof(ioctl_arg->bif.model));
399 acpi_battery_clean_str(ioctl_arg->bif.serial,
400 sizeof(ioctl_arg->bif.serial));
401 acpi_battery_clean_str(ioctl_arg->bif.type,
402 sizeof(ioctl_arg->bif.type));
403 acpi_battery_clean_str(ioctl_arg->bif.oeminfo,
404 sizeof(ioctl_arg->bif.oeminfo));
407 case ACPIIO_BATT_GET_BST:
409 bzero(&ioctl_arg->bst, sizeof(ioctl_arg->bst));
410 error = ACPI_BATT_GET_STATUS(dev, &ioctl_arg->bst);
421 acpi_battery_sysctl(SYSCTL_HANDLER_ARGS)
426 * Tolerate a race here because newbus lock can't be acquired before
427 * acpi_battery_get_battinfo() as it can create a LOR with the sysctl
430 acpi_battery_get_battinfo(NULL, &acpi_battery_battinfo);
431 val = *(u_int *)oidp->oid_arg1;
432 error = sysctl_handle_int(oidp, &val, 0, req);
437 acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS)
442 * Tolerate a race here in order to avoid a LOR between sysctl lock
445 count = acpi_battery_get_units();
446 error = sysctl_handle_int(oidp, &count, 0, req);
451 acpi_battery_init(void)
453 struct acpi_softc *sc;
457 ACPI_SERIAL_ASSERT(battery);
460 dev = devclass_get_device(devclass_find("acpi"), 0);
463 sc = device_get_softc(dev);
465 error = acpi_register_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl,
469 error = acpi_register_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl,
473 error = acpi_register_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl, NULL);
476 error = acpi_register_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl, NULL);
480 sysctl_ctx_init(&acpi_battery_sysctl_ctx);
481 acpi_battery_sysctl_tree = SYSCTL_ADD_NODE(&acpi_battery_sysctl_ctx,
482 SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO, "battery", CTLFLAG_RD,
483 0, "battery status and info");
484 SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
485 SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
486 OID_AUTO, "life", CTLTYPE_INT | CTLFLAG_RD,
487 &acpi_battery_battinfo.cap, 0, acpi_battery_sysctl, "I",
488 "percent capacity remaining");
489 SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
490 SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
491 OID_AUTO, "time", CTLTYPE_INT | CTLFLAG_RD,
492 &acpi_battery_battinfo.min, 0, acpi_battery_sysctl, "I",
493 "remaining time in minutes");
494 SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
495 SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
496 OID_AUTO, "state", CTLTYPE_INT | CTLFLAG_RD,
497 &acpi_battery_battinfo.state, 0, acpi_battery_sysctl, "I",
498 "current status flags");
499 SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
500 SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
501 OID_AUTO, "units", CTLTYPE_INT | CTLFLAG_RD,
502 NULL, 0, acpi_battery_units_sysctl, "I", "number of batteries");
503 SYSCTL_ADD_INT(&acpi_battery_sysctl_ctx,
504 SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
505 OID_AUTO, "info_expire", CTLFLAG_RW,
506 &acpi_battery_info_expire, 0,
507 "time in seconds until info is refreshed");
509 acpi_batteries_initted = TRUE;
513 acpi_deregister_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl);
514 acpi_deregister_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl);
515 acpi_deregister_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl);
516 acpi_deregister_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl);