2010-11-10 01:29:56 +00:00
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/*-
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2017-11-27 15:11:47 +00:00
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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2010-11-10 01:29:56 +00:00
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* Copyright (c) 2001 Mitsuru IWASAKI
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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 <sys/param.h>
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#include <sys/bus.h>
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#include <sys/condvar.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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2010-11-10 18:50:12 +00:00
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#include <sys/kernel.h>
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2010-11-10 01:29:56 +00:00
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/uio.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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#include <machine/apm_bios.h>
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/*
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* APM driver emulation
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*/
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#define APM_UNKNOWN 0xff
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static int apm_active;
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2011-11-07 06:44:47 +00:00
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static MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation");
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2010-11-10 01:29:56 +00:00
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static d_open_t apmopen;
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static d_write_t apmwrite;
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static d_ioctl_t apmioctl;
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static d_poll_t apmpoll;
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static d_kqfilter_t apmkqfilter;
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static void apmreadfiltdetach(struct knote *kn);
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static int apmreadfilt(struct knote *kn, long hint);
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static struct filterops apm_readfiltops = {
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.f_isfd = 1,
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.f_detach = apmreadfiltdetach,
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.f_event = apmreadfilt,
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};
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static struct cdevsw apm_cdevsw = {
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.d_version = D_VERSION,
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.d_open = apmopen,
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.d_write = apmwrite,
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.d_ioctl = apmioctl,
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.d_poll = apmpoll,
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.d_name = "apm",
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.d_kqfilter = apmkqfilter
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};
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static int
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acpi_capm_convert_battstate(struct acpi_battinfo *battp)
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{
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int state;
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state = APM_UNKNOWN;
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if (battp->state & ACPI_BATT_STAT_DISCHARG) {
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if (battp->cap >= 50)
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state = 0; /* high */
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else
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state = 1; /* low */
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}
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if (battp->state & ACPI_BATT_STAT_CRITICAL)
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state = 2; /* critical */
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if (battp->state & ACPI_BATT_STAT_CHARGING)
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state = 3; /* charging */
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/* If still unknown, determine it based on the battery capacity. */
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if (state == APM_UNKNOWN) {
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if (battp->cap >= 50)
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state = 0; /* high */
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else
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state = 1; /* low */
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}
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return (state);
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}
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static int
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acpi_capm_convert_battflags(struct acpi_battinfo *battp)
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{
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int flags;
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flags = 0;
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if (battp->cap >= 50)
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flags |= APM_BATT_HIGH;
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else {
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if (battp->state & ACPI_BATT_STAT_CRITICAL)
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flags |= APM_BATT_CRITICAL;
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else
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flags |= APM_BATT_LOW;
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}
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if (battp->state & ACPI_BATT_STAT_CHARGING)
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flags |= APM_BATT_CHARGING;
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if (battp->state == ACPI_BATT_STAT_NOT_PRESENT)
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flags = APM_BATT_NOT_PRESENT;
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return (flags);
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}
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static int
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acpi_capm_get_info(apm_info_t aip)
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{
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int acline;
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struct acpi_battinfo batt;
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aip->ai_infoversion = 1;
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aip->ai_major = 1;
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aip->ai_minor = 2;
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aip->ai_status = apm_active;
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aip->ai_capabilities= 0xff00; /* unknown */
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if (acpi_acad_get_acline(&acline))
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aip->ai_acline = APM_UNKNOWN; /* unknown */
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else
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aip->ai_acline = acline; /* on/off */
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if (acpi_battery_get_battinfo(NULL, &batt) != 0) {
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aip->ai_batt_stat = APM_UNKNOWN;
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aip->ai_batt_life = APM_UNKNOWN;
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aip->ai_batt_time = -1; /* unknown */
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aip->ai_batteries = ~0U; /* unknown */
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} else {
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aip->ai_batt_stat = acpi_capm_convert_battstate(&batt);
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aip->ai_batt_life = batt.cap;
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aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
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aip->ai_batteries = acpi_battery_get_units();
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}
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return (0);
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}
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static int
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acpi_capm_get_pwstatus(apm_pwstatus_t app)
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{
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device_t dev;
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int acline, unit, error;
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struct acpi_battinfo batt;
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if (app->ap_device != PMDV_ALLDEV &&
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(app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
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return (1);
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if (app->ap_device == PMDV_ALLDEV)
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error = acpi_battery_get_battinfo(NULL, &batt);
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else {
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unit = app->ap_device - PMDV_BATT0;
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dev = devclass_get_device(devclass_find("battery"), unit);
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if (dev != NULL)
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error = acpi_battery_get_battinfo(dev, &batt);
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else
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error = ENXIO;
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}
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if (error)
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return (1);
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app->ap_batt_stat = acpi_capm_convert_battstate(&batt);
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app->ap_batt_flag = acpi_capm_convert_battflags(&batt);
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app->ap_batt_life = batt.cap;
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app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
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if (acpi_acad_get_acline(&acline))
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app->ap_acline = APM_UNKNOWN;
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else
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app->ap_acline = acline; /* on/off */
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return (0);
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}
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/* Create a struct for tracking per-device suspend notification. */
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static struct apm_clone_data *
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apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc)
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{
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struct apm_clone_data *clone;
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clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK);
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clone->cdev = dev;
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clone->acpi_sc = acpi_sc;
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clone->notify_status = APM_EV_NONE;
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bzero(&clone->sel_read, sizeof(clone->sel_read));
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knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex);
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/*
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* The acpi device is always managed by devd(8) and is considered
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* writable (i.e., ack is required to allow suspend to proceed.)
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*/
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if (strcmp("acpi", devtoname(dev)) == 0)
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clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE;
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else
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clone->flags = ACPI_EVF_NONE;
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ACPI_LOCK(acpi);
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STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries);
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ACPI_UNLOCK(acpi);
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return (clone);
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}
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2011-12-05 16:08:18 +00:00
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static void
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apmdtor(void *data)
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2010-11-10 01:29:56 +00:00
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{
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struct apm_clone_data *clone;
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struct acpi_softc *acpi_sc;
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2011-12-05 16:08:18 +00:00
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clone = data;
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2010-11-10 01:29:56 +00:00
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acpi_sc = clone->acpi_sc;
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/* We are about to lose a reference so check if suspend should occur */
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if (acpi_sc->acpi_next_sstate != 0 &&
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clone->notify_status != APM_EV_ACKED)
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acpi_AckSleepState(clone, 0);
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/* Remove this clone's data from the list and free it. */
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ACPI_LOCK(acpi);
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STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries);
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Fix a deficiency in the selinfo interface:
If a selinfo object is recorded (via selrecord()) and then it is
quickly destroyed, with the waiters missing the opportunity to awake,
at the next iteration they will find the selinfo object destroyed,
causing a PF#.
That happens because the selinfo interface has no way to drain the
waiters before to destroy the registered selinfo object. Also this
race is quite rare to get in practice, because it would require a
selrecord(), a poll request by another thread and a quick destruction
of the selrecord()'ed selinfo object.
Fix this by adding the seldrain() routine which should be called
before to destroy the selinfo objects (in order to avoid such case),
and fix the present cases where it might have already been called.
Sometimes, the context is safe enough to prevent this type of race,
like it happens in device drivers which installs selinfo objects on
poll callbacks. There, the destruction of the selinfo object happens
at driver detach time, when all the filedescriptors should be already
closed, thus there cannot be a race.
For this case, mfi(4) device driver can be set as an example, as it
implements a full correct logic for preventing this from happening.
Sponsored by: Sandvine Incorporated
Reported by: rstone
Tested by: pluknet
Reviewed by: jhb, kib
Approved by: re (bz)
MFC after: 3 weeks
2011-08-25 15:51:54 +00:00
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seldrain(&clone->sel_read);
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2010-11-10 01:29:56 +00:00
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knlist_destroy(&clone->sel_read.si_note);
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ACPI_UNLOCK(acpi);
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free(clone, M_APMDEV);
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2011-12-05 16:08:18 +00:00
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}
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static int
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apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
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{
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struct acpi_softc *acpi_sc;
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struct apm_clone_data *clone;
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acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
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clone = apm_create_clone(dev, acpi_sc);
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devfs_set_cdevpriv(clone, apmdtor);
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/* If the device is opened for write, record that. */
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if ((flag & FWRITE) != 0)
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clone->flags |= ACPI_EVF_WRITE;
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2010-11-10 01:29:56 +00:00
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return (0);
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}
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static int
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apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
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{
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int error;
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struct apm_clone_data *clone;
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struct acpi_softc *acpi_sc;
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struct apm_info info;
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struct apm_event_info *ev_info;
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apm_info_old_t aiop;
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error = 0;
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2011-12-05 16:08:18 +00:00
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devfs_get_cdevpriv((void **)&clone);
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2010-11-10 01:29:56 +00:00
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acpi_sc = clone->acpi_sc;
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switch (cmd) {
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case APMIO_SUSPEND:
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if ((flag & FWRITE) == 0)
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return (EPERM);
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if (acpi_sc->acpi_next_sstate == 0) {
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if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) {
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error = acpi_ReqSleepState(acpi_sc,
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acpi_sc->acpi_suspend_sx);
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} else {
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printf(
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"power off via apm suspend not supported\n");
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error = ENXIO;
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}
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} else
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error = acpi_AckSleepState(clone, 0);
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break;
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case APMIO_STANDBY:
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if ((flag & FWRITE) == 0)
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return (EPERM);
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if (acpi_sc->acpi_next_sstate == 0) {
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if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) {
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error = acpi_ReqSleepState(acpi_sc,
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acpi_sc->acpi_standby_sx);
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} else {
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printf(
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"power off via apm standby not supported\n");
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error = ENXIO;
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}
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} else
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error = acpi_AckSleepState(clone, 0);
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break;
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case APMIO_NEXTEVENT:
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printf("apm nextevent start\n");
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ACPI_LOCK(acpi);
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if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status ==
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APM_EV_NONE) {
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ev_info = (struct apm_event_info *)addr;
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if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3)
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ev_info->type = PMEV_STANDBYREQ;
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else
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ev_info->type = PMEV_SUSPENDREQ;
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ev_info->index = 0;
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clone->notify_status = APM_EV_NOTIFIED;
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printf("apm event returning %d\n", ev_info->type);
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} else
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error = EAGAIN;
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ACPI_UNLOCK(acpi);
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break;
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case APMIO_GETINFO_OLD:
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|
|
if (acpi_capm_get_info(&info))
|
|
|
|
error = ENXIO;
|
|
|
|
aiop = (apm_info_old_t)addr;
|
|
|
|
aiop->ai_major = info.ai_major;
|
|
|
|
aiop->ai_minor = info.ai_minor;
|
|
|
|
aiop->ai_acline = info.ai_acline;
|
|
|
|
aiop->ai_batt_stat = info.ai_batt_stat;
|
|
|
|
aiop->ai_batt_life = info.ai_batt_life;
|
|
|
|
aiop->ai_status = info.ai_status;
|
|
|
|
break;
|
|
|
|
case APMIO_GETINFO:
|
|
|
|
if (acpi_capm_get_info((apm_info_t)addr))
|
|
|
|
error = ENXIO;
|
|
|
|
break;
|
|
|
|
case APMIO_GETPWSTATUS:
|
|
|
|
if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr))
|
|
|
|
error = ENXIO;
|
|
|
|
break;
|
|
|
|
case APMIO_ENABLE:
|
|
|
|
if ((flag & FWRITE) == 0)
|
|
|
|
return (EPERM);
|
|
|
|
apm_active = 1;
|
|
|
|
break;
|
|
|
|
case APMIO_DISABLE:
|
|
|
|
if ((flag & FWRITE) == 0)
|
|
|
|
return (EPERM);
|
|
|
|
apm_active = 0;
|
|
|
|
break;
|
|
|
|
case APMIO_HALTCPU:
|
|
|
|
break;
|
|
|
|
case APMIO_NOTHALTCPU:
|
|
|
|
break;
|
|
|
|
case APMIO_DISPLAY:
|
|
|
|
if ((flag & FWRITE) == 0)
|
|
|
|
return (EPERM);
|
|
|
|
break;
|
|
|
|
case APMIO_BIOS:
|
|
|
|
if ((flag & FWRITE) == 0)
|
|
|
|
return (EPERM);
|
|
|
|
bzero(addr, sizeof(struct apm_bios_arg));
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
error = EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
|
|
|
|
{
|
|
|
|
return (uio->uio_resid);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
apmpoll(struct cdev *dev, int events, struct thread *td)
|
|
|
|
{
|
|
|
|
struct apm_clone_data *clone;
|
|
|
|
int revents;
|
|
|
|
|
|
|
|
revents = 0;
|
2011-12-05 16:08:18 +00:00
|
|
|
devfs_get_cdevpriv((void **)&clone);
|
2010-11-10 01:29:56 +00:00
|
|
|
ACPI_LOCK(acpi);
|
|
|
|
if (clone->acpi_sc->acpi_next_sstate)
|
|
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
|
|
else
|
|
|
|
selrecord(td, &clone->sel_read);
|
|
|
|
ACPI_UNLOCK(acpi);
|
|
|
|
return (revents);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
apmkqfilter(struct cdev *dev, struct knote *kn)
|
|
|
|
{
|
|
|
|
struct apm_clone_data *clone;
|
|
|
|
|
2011-12-05 16:08:18 +00:00
|
|
|
devfs_get_cdevpriv((void **)&clone);
|
2010-11-10 01:29:56 +00:00
|
|
|
ACPI_LOCK(acpi);
|
|
|
|
kn->kn_hook = clone;
|
|
|
|
kn->kn_fop = &apm_readfiltops;
|
|
|
|
knlist_add(&clone->sel_read.si_note, kn, 0);
|
|
|
|
ACPI_UNLOCK(acpi);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
apmreadfiltdetach(struct knote *kn)
|
|
|
|
{
|
|
|
|
struct apm_clone_data *clone;
|
|
|
|
|
|
|
|
ACPI_LOCK(acpi);
|
|
|
|
clone = kn->kn_hook;
|
|
|
|
knlist_remove(&clone->sel_read.si_note, kn, 0);
|
|
|
|
ACPI_UNLOCK(acpi);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
apmreadfilt(struct knote *kn, long hint)
|
|
|
|
{
|
|
|
|
struct apm_clone_data *clone;
|
|
|
|
int sleeping;
|
|
|
|
|
|
|
|
ACPI_LOCK(acpi);
|
|
|
|
clone = kn->kn_hook;
|
|
|
|
sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0;
|
|
|
|
ACPI_UNLOCK(acpi);
|
|
|
|
return (sleeping);
|
|
|
|
}
|
|
|
|
|
2010-11-10 18:50:12 +00:00
|
|
|
void
|
|
|
|
acpi_apm_init(struct acpi_softc *sc)
|
2010-11-10 01:29:56 +00:00
|
|
|
{
|
|
|
|
|
2010-11-10 18:50:12 +00:00
|
|
|
/* Create a clone for /dev/acpi also. */
|
|
|
|
STAILQ_INIT(&sc->apm_cdevs);
|
|
|
|
sc->acpi_clone = apm_create_clone(sc->acpi_dev_t, sc);
|
2011-12-05 16:08:18 +00:00
|
|
|
|
|
|
|
make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0660, "apmctl");
|
|
|
|
make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0664, "apm");
|
2010-11-10 01:29:56 +00:00
|
|
|
}
|