mirror of
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a56fe095f0
reintroduced after HEAD is reopened for commits by re@. Approved by: re (kib), attilio
505 lines
14 KiB
C
505 lines
14 KiB
C
/*-
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* Copyright (c) 2005 Nate Lawson
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* Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bus.h>
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#include <sys/ioccom.h>
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#include <sys/sysctl.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <dev/acpica/acpivar.h>
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#include <dev/acpica/acpiio.h>
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/* Default seconds before re-sampling the battery state. */
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#define ACPI_BATTERY_INFO_EXPIRE 5
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static int acpi_batteries_initted;
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static int acpi_battery_info_expire = ACPI_BATTERY_INFO_EXPIRE;
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static struct acpi_battinfo acpi_battery_battinfo;
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static struct sysctl_ctx_list acpi_battery_sysctl_ctx;
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static struct sysctl_oid *acpi_battery_sysctl_tree;
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ACPI_SERIAL_DECL(battery, "ACPI generic battery");
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static void acpi_reset_battinfo(struct acpi_battinfo *info);
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static void acpi_battery_clean_str(char *str, int len);
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static device_t acpi_battery_find_dev(u_int logical_unit);
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static int acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg);
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static int acpi_battery_sysctl(SYSCTL_HANDLER_ARGS);
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static int acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS);
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static int acpi_battery_init(void);
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int
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acpi_battery_register(device_t dev)
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{
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int error;
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error = 0;
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ACPI_SERIAL_BEGIN(battery);
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if (!acpi_batteries_initted)
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error = acpi_battery_init();
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ACPI_SERIAL_END(battery);
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return (error);
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}
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int
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acpi_battery_remove(device_t dev)
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{
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return (0);
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}
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int
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acpi_battery_get_units(void)
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{
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devclass_t batt_dc;
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batt_dc = devclass_find("battery");
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if (batt_dc == NULL)
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return (0);
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return (devclass_get_count(batt_dc));
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}
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int
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acpi_battery_get_info_expire(void)
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{
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return (acpi_battery_info_expire);
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}
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/* Check _BST results for validity. */
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int
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acpi_battery_bst_valid(struct acpi_bst *bst)
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{
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return (bst->state < ACPI_BATT_STAT_MAX && bst->cap != ACPI_BATT_UNKNOWN &&
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bst->volt != ACPI_BATT_UNKNOWN);
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}
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/* Check _BIF results for validity. */
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int
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acpi_battery_bif_valid(struct acpi_bif *bif)
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{
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return (bif->lfcap != 0);
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}
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/* Get info about one or all batteries. */
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int
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acpi_battery_get_battinfo(device_t dev, struct acpi_battinfo *battinfo)
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{
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int batt_stat, devcount, dev_idx, error, i;
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int total_cap, total_min, valid_rate, valid_units;
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devclass_t batt_dc;
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device_t batt_dev;
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struct acpi_bst *bst;
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struct acpi_bif *bif;
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struct acpi_battinfo *bi;
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/*
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* Get the battery devclass and max unit for battery devices. If there
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* are none or error, return immediately.
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*/
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batt_dc = devclass_find("battery");
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if (batt_dc == NULL)
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return (ENXIO);
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devcount = devclass_get_maxunit(batt_dc);
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if (devcount == 0)
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return (ENXIO);
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/*
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* Allocate storage for all _BST data, their derived battinfo data,
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* and the current battery's _BIF data.
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*/
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bst = malloc(devcount * sizeof(*bst), M_TEMP, M_WAITOK | M_ZERO);
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bi = malloc(devcount * sizeof(*bi), M_TEMP, M_WAITOK | M_ZERO);
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bif = malloc(sizeof(*bif), M_TEMP, M_WAITOK | M_ZERO);
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/*
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* Pass 1: for each battery that is present and valid, get its status,
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* calculate percent capacity remaining, and sum all the current
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* discharge rates.
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*/
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dev_idx = -1;
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batt_stat = valid_rate = valid_units = 0;
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for (i = 0; i < devcount; i++) {
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/* Default info for every battery is "not present". */
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acpi_reset_battinfo(&bi[i]);
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/*
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* Find the device. Since devcount is in terms of max units, this
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* may be a sparse array so skip devices that aren't present.
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*/
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batt_dev = devclass_get_device(batt_dc, i);
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if (batt_dev == NULL)
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continue;
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/* If examining a specific battery and this is it, record its index. */
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if (dev != NULL && dev == batt_dev)
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dev_idx = i;
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/*
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* Be sure we can get various info from the battery. Note that
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* acpi_BatteryIsPresent() is not enough because smart batteries only
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* return that the device is present.
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*/
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if (!acpi_BatteryIsPresent(batt_dev) ||
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ACPI_BATT_GET_STATUS(batt_dev, &bst[i]) != 0 ||
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ACPI_BATT_GET_INFO(batt_dev, bif) != 0)
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continue;
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/* If a battery is not installed, we sometimes get strange values. */
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if (!acpi_battery_bst_valid(&bst[i]) ||
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!acpi_battery_bif_valid(bif))
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continue;
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/*
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* Record current state. If both charging and discharging are set,
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* ignore the charging flag.
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*/
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valid_units++;
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if ((bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
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bst[i].state &= ~ACPI_BATT_STAT_CHARGING;
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batt_stat |= bst[i].state;
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bi[i].state = bst[i].state;
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/*
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* If the battery info is in terms of mA, convert to mW by
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* multiplying by the design voltage. If the design voltage
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* is 0 (due to some error reading the battery), skip this
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* conversion.
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*/
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if (bif->units == ACPI_BIF_UNITS_MA && bif->dvol != 0 && dev == NULL) {
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bst[i].rate = (bst[i].rate * bif->dvol) / 1000;
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bst[i].cap = (bst[i].cap * bif->dvol) / 1000;
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bif->lfcap = (bif->lfcap * bif->dvol) / 1000;
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}
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/* Calculate percent capacity remaining. */
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bi[i].cap = (100 * bst[i].cap) / bif->lfcap;
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/*
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* Some laptops report the "design-capacity" instead of the
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* "real-capacity" when the battery is fully charged. That breaks
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* the above arithmetic as it needs to be 100% maximum.
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*/
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if (bi[i].cap > 100)
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bi[i].cap = 100;
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/*
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* On systems with more than one battery, they may get used
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* sequentially, thus bst.rate may only signify the one currently
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* in use. For the remaining batteries, bst.rate will be zero,
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* which makes it impossible to calculate the total remaining time.
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* Therefore, we sum the bst.rate for batteries in the discharging
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* state and use the sum to calculate the total remaining time.
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*/
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if (bst[i].rate != ACPI_BATT_UNKNOWN &&
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(bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
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valid_rate += bst[i].rate;
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}
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/* If the caller asked for a device but we didn't find it, error. */
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if (dev != NULL && dev_idx == -1) {
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error = ENXIO;
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goto out;
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}
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/* Pass 2: calculate capacity and remaining time for all batteries. */
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total_cap = total_min = 0;
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for (i = 0; i < devcount; i++) {
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/*
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* If any batteries are discharging, use the sum of the bst.rate
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* values. Otherwise, we are on AC power, and there is infinite
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* time remaining for this battery until we go offline.
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*/
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if (valid_rate > 0)
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bi[i].min = (60 * bst[i].cap) / valid_rate;
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else
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bi[i].min = 0;
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total_min += bi[i].min;
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/* If this battery is not present, don't use its capacity. */
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if (bi[i].cap != -1)
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total_cap += bi[i].cap;
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}
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/*
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* Return total battery percent and time remaining. If there are
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* no valid batteries, report values as unknown.
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*/
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if (valid_units > 0) {
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if (dev == NULL) {
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battinfo->cap = total_cap / valid_units;
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battinfo->min = total_min;
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battinfo->state = batt_stat;
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battinfo->rate = valid_rate;
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} else {
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battinfo->cap = bi[dev_idx].cap;
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battinfo->min = bi[dev_idx].min;
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battinfo->state = bi[dev_idx].state;
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battinfo->rate = bst[dev_idx].rate;
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}
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/*
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* If the queried battery has no discharge rate or is charging,
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* report that we don't know the remaining time.
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*/
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if (valid_rate == 0 || (battinfo->state & ACPI_BATT_STAT_CHARGING))
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battinfo->min = -1;
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} else
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acpi_reset_battinfo(battinfo);
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error = 0;
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out:
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if (bi)
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free(bi, M_TEMP);
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if (bif)
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free(bif, M_TEMP);
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if (bst)
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free(bst, M_TEMP);
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return (error);
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}
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static void
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acpi_reset_battinfo(struct acpi_battinfo *info)
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{
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info->cap = -1;
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info->min = -1;
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info->state = ACPI_BATT_STAT_NOT_PRESENT;
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info->rate = -1;
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}
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/* Make string printable, removing invalid chars. */
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static void
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acpi_battery_clean_str(char *str, int len)
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{
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int i;
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for (i = 0; i < len && *str != '\0'; i++, str++) {
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if (!isprint(*str))
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*str = '?';
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}
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/* NUL-terminate the string if we reached the end. */
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if (i == len)
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*str = '\0';
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}
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/*
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* The battery interface deals with devices and methods but userland
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* expects a logical unit number. Convert a logical unit to a device_t.
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*/
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static device_t
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acpi_battery_find_dev(u_int logical_unit)
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{
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int found_unit, i, maxunit;
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device_t dev;
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devclass_t batt_dc;
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dev = NULL;
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found_unit = 0;
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batt_dc = devclass_find("battery");
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maxunit = devclass_get_maxunit(batt_dc);
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for (i = 0; i < maxunit; i++) {
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dev = devclass_get_device(batt_dc, i);
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if (dev == NULL)
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continue;
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if (logical_unit == found_unit)
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break;
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found_unit++;
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dev = NULL;
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}
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return (dev);
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}
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static int
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acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg)
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{
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union acpi_battery_ioctl_arg *ioctl_arg;
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int error, unit;
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device_t dev;
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/* For commands that use the ioctl_arg struct, validate it first. */
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error = ENXIO;
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unit = 0;
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dev = NULL;
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ioctl_arg = NULL;
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if (IOCPARM_LEN(cmd) == sizeof(*ioctl_arg)) {
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ioctl_arg = (union acpi_battery_ioctl_arg *)addr;
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unit = ioctl_arg->unit;
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if (unit != ACPI_BATTERY_ALL_UNITS)
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dev = acpi_battery_find_dev(unit);
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}
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/*
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* No security check required: information retrieval only. If
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* new functions are added here, a check might be required.
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*/
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switch (cmd) {
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case ACPIIO_BATT_GET_UNITS:
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*(int *)addr = acpi_battery_get_units();
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error = 0;
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break;
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case ACPIIO_BATT_GET_BATTINFO:
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if (dev != NULL || unit == ACPI_BATTERY_ALL_UNITS) {
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bzero(&ioctl_arg->battinfo, sizeof(ioctl_arg->battinfo));
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error = acpi_battery_get_battinfo(dev, &ioctl_arg->battinfo);
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}
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break;
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case ACPIIO_BATT_GET_BIF:
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if (dev != NULL) {
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bzero(&ioctl_arg->bif, sizeof(ioctl_arg->bif));
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error = ACPI_BATT_GET_INFO(dev, &ioctl_arg->bif);
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/*
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* Remove invalid characters. Perhaps this should be done
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* within a convenience function so all callers get the
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* benefit.
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*/
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acpi_battery_clean_str(ioctl_arg->bif.model,
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sizeof(ioctl_arg->bif.model));
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acpi_battery_clean_str(ioctl_arg->bif.serial,
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sizeof(ioctl_arg->bif.serial));
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acpi_battery_clean_str(ioctl_arg->bif.type,
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sizeof(ioctl_arg->bif.type));
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acpi_battery_clean_str(ioctl_arg->bif.oeminfo,
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sizeof(ioctl_arg->bif.oeminfo));
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}
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break;
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case ACPIIO_BATT_GET_BST:
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if (dev != NULL) {
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bzero(&ioctl_arg->bst, sizeof(ioctl_arg->bst));
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error = ACPI_BATT_GET_STATUS(dev, &ioctl_arg->bst);
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}
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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static int
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acpi_battery_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int val, error;
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acpi_battery_get_battinfo(NULL, &acpi_battery_battinfo);
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val = *(u_int *)oidp->oid_arg1;
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error = sysctl_handle_int(oidp, &val, 0, req);
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return (error);
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}
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static int
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acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS)
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{
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int count, error;
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count = acpi_battery_get_units();
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error = sysctl_handle_int(oidp, &count, 0, req);
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return (error);
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}
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static int
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acpi_battery_init(void)
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{
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struct acpi_softc *sc;
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device_t dev;
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int error;
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ACPI_SERIAL_ASSERT(battery);
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error = ENXIO;
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dev = devclass_get_device(devclass_find("acpi"), 0);
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if (dev == NULL)
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goto out;
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sc = device_get_softc(dev);
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error = acpi_register_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl,
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NULL);
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if (error != 0)
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goto out;
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error = acpi_register_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl,
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NULL);
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if (error != 0)
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goto out;
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error = acpi_register_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl, NULL);
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if (error != 0)
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goto out;
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error = acpi_register_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl, NULL);
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if (error != 0)
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goto out;
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sysctl_ctx_init(&acpi_battery_sysctl_ctx);
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acpi_battery_sysctl_tree = SYSCTL_ADD_NODE(&acpi_battery_sysctl_ctx,
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SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO, "battery", CTLFLAG_RD,
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0, "battery status and info");
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SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
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SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
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OID_AUTO, "life", CTLTYPE_INT | CTLFLAG_RD,
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&acpi_battery_battinfo.cap, 0, acpi_battery_sysctl, "I",
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"percent capacity remaining");
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SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
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SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
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OID_AUTO, "time", CTLTYPE_INT | CTLFLAG_RD,
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&acpi_battery_battinfo.min, 0, acpi_battery_sysctl, "I",
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"remaining time in minutes");
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SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
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SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
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OID_AUTO, "state", CTLTYPE_INT | CTLFLAG_RD,
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&acpi_battery_battinfo.state, 0, acpi_battery_sysctl, "I",
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"current status flags");
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SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
|
|
SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
|
|
OID_AUTO, "units", CTLTYPE_INT | CTLFLAG_RD,
|
|
NULL, 0, acpi_battery_units_sysctl, "I", "number of batteries");
|
|
SYSCTL_ADD_INT(&acpi_battery_sysctl_ctx,
|
|
SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
|
|
OID_AUTO, "info_expire", CTLFLAG_RW,
|
|
&acpi_battery_info_expire, 0,
|
|
"time in seconds until info is refreshed");
|
|
|
|
acpi_batteries_initted = TRUE;
|
|
|
|
out:
|
|
if (error != 0) {
|
|
acpi_deregister_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl);
|
|
acpi_deregister_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl);
|
|
acpi_deregister_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl);
|
|
acpi_deregister_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl);
|
|
}
|
|
return (error);
|
|
}
|