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freebsd-dev/sys/x86/acpica/acpi_apm.c
Pedro F. Giffuni ebf5747bdb sys/x86: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:11:47 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2001 Mitsuru IWASAKI
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/poll.h>
#include <sys/uio.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpiio.h>
#include <machine/apm_bios.h>
/*
* APM driver emulation
*/
#define APM_UNKNOWN 0xff
static int apm_active;
static MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation");
static d_open_t apmopen;
static d_write_t apmwrite;
static d_ioctl_t apmioctl;
static d_poll_t apmpoll;
static d_kqfilter_t apmkqfilter;
static void apmreadfiltdetach(struct knote *kn);
static int apmreadfilt(struct knote *kn, long hint);
static struct filterops apm_readfiltops = {
.f_isfd = 1,
.f_detach = apmreadfiltdetach,
.f_event = apmreadfilt,
};
static struct cdevsw apm_cdevsw = {
.d_version = D_VERSION,
.d_open = apmopen,
.d_write = apmwrite,
.d_ioctl = apmioctl,
.d_poll = apmpoll,
.d_name = "apm",
.d_kqfilter = apmkqfilter
};
static int
acpi_capm_convert_battstate(struct acpi_battinfo *battp)
{
int state;
state = APM_UNKNOWN;
if (battp->state & ACPI_BATT_STAT_DISCHARG) {
if (battp->cap >= 50)
state = 0; /* high */
else
state = 1; /* low */
}
if (battp->state & ACPI_BATT_STAT_CRITICAL)
state = 2; /* critical */
if (battp->state & ACPI_BATT_STAT_CHARGING)
state = 3; /* charging */
/* If still unknown, determine it based on the battery capacity. */
if (state == APM_UNKNOWN) {
if (battp->cap >= 50)
state = 0; /* high */
else
state = 1; /* low */
}
return (state);
}
static int
acpi_capm_convert_battflags(struct acpi_battinfo *battp)
{
int flags;
flags = 0;
if (battp->cap >= 50)
flags |= APM_BATT_HIGH;
else {
if (battp->state & ACPI_BATT_STAT_CRITICAL)
flags |= APM_BATT_CRITICAL;
else
flags |= APM_BATT_LOW;
}
if (battp->state & ACPI_BATT_STAT_CHARGING)
flags |= APM_BATT_CHARGING;
if (battp->state == ACPI_BATT_STAT_NOT_PRESENT)
flags = APM_BATT_NOT_PRESENT;
return (flags);
}
static int
acpi_capm_get_info(apm_info_t aip)
{
int acline;
struct acpi_battinfo batt;
aip->ai_infoversion = 1;
aip->ai_major = 1;
aip->ai_minor = 2;
aip->ai_status = apm_active;
aip->ai_capabilities= 0xff00; /* unknown */
if (acpi_acad_get_acline(&acline))
aip->ai_acline = APM_UNKNOWN; /* unknown */
else
aip->ai_acline = acline; /* on/off */
if (acpi_battery_get_battinfo(NULL, &batt) != 0) {
aip->ai_batt_stat = APM_UNKNOWN;
aip->ai_batt_life = APM_UNKNOWN;
aip->ai_batt_time = -1; /* unknown */
aip->ai_batteries = ~0U; /* unknown */
} else {
aip->ai_batt_stat = acpi_capm_convert_battstate(&batt);
aip->ai_batt_life = batt.cap;
aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
aip->ai_batteries = acpi_battery_get_units();
}
return (0);
}
static int
acpi_capm_get_pwstatus(apm_pwstatus_t app)
{
device_t dev;
int acline, unit, error;
struct acpi_battinfo batt;
if (app->ap_device != PMDV_ALLDEV &&
(app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
return (1);
if (app->ap_device == PMDV_ALLDEV)
error = acpi_battery_get_battinfo(NULL, &batt);
else {
unit = app->ap_device - PMDV_BATT0;
dev = devclass_get_device(devclass_find("battery"), unit);
if (dev != NULL)
error = acpi_battery_get_battinfo(dev, &batt);
else
error = ENXIO;
}
if (error)
return (1);
app->ap_batt_stat = acpi_capm_convert_battstate(&batt);
app->ap_batt_flag = acpi_capm_convert_battflags(&batt);
app->ap_batt_life = batt.cap;
app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
if (acpi_acad_get_acline(&acline))
app->ap_acline = APM_UNKNOWN;
else
app->ap_acline = acline; /* on/off */
return (0);
}
/* Create a struct for tracking per-device suspend notification. */
static struct apm_clone_data *
apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc)
{
struct apm_clone_data *clone;
clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK);
clone->cdev = dev;
clone->acpi_sc = acpi_sc;
clone->notify_status = APM_EV_NONE;
bzero(&clone->sel_read, sizeof(clone->sel_read));
knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex);
/*
* The acpi device is always managed by devd(8) and is considered
* writable (i.e., ack is required to allow suspend to proceed.)
*/
if (strcmp("acpi", devtoname(dev)) == 0)
clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE;
else
clone->flags = ACPI_EVF_NONE;
ACPI_LOCK(acpi);
STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries);
ACPI_UNLOCK(acpi);
return (clone);
}
static void
apmdtor(void *data)
{
struct apm_clone_data *clone;
struct acpi_softc *acpi_sc;
clone = data;
acpi_sc = clone->acpi_sc;
/* We are about to lose a reference so check if suspend should occur */
if (acpi_sc->acpi_next_sstate != 0 &&
clone->notify_status != APM_EV_ACKED)
acpi_AckSleepState(clone, 0);
/* Remove this clone's data from the list and free it. */
ACPI_LOCK(acpi);
STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries);
seldrain(&clone->sel_read);
knlist_destroy(&clone->sel_read.si_note);
ACPI_UNLOCK(acpi);
free(clone, M_APMDEV);
}
static int
apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct acpi_softc *acpi_sc;
struct apm_clone_data *clone;
acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
clone = apm_create_clone(dev, acpi_sc);
devfs_set_cdevpriv(clone, apmdtor);
/* If the device is opened for write, record that. */
if ((flag & FWRITE) != 0)
clone->flags |= ACPI_EVF_WRITE;
return (0);
}
static int
apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
int error;
struct apm_clone_data *clone;
struct acpi_softc *acpi_sc;
struct apm_info info;
struct apm_event_info *ev_info;
apm_info_old_t aiop;
error = 0;
devfs_get_cdevpriv((void **)&clone);
acpi_sc = clone->acpi_sc;
switch (cmd) {
case APMIO_SUSPEND:
if ((flag & FWRITE) == 0)
return (EPERM);
if (acpi_sc->acpi_next_sstate == 0) {
if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) {
error = acpi_ReqSleepState(acpi_sc,
acpi_sc->acpi_suspend_sx);
} else {
printf(
"power off via apm suspend not supported\n");
error = ENXIO;
}
} else
error = acpi_AckSleepState(clone, 0);
break;
case APMIO_STANDBY:
if ((flag & FWRITE) == 0)
return (EPERM);
if (acpi_sc->acpi_next_sstate == 0) {
if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) {
error = acpi_ReqSleepState(acpi_sc,
acpi_sc->acpi_standby_sx);
} else {
printf(
"power off via apm standby not supported\n");
error = ENXIO;
}
} else
error = acpi_AckSleepState(clone, 0);
break;
case APMIO_NEXTEVENT:
printf("apm nextevent start\n");
ACPI_LOCK(acpi);
if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status ==
APM_EV_NONE) {
ev_info = (struct apm_event_info *)addr;
if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3)
ev_info->type = PMEV_STANDBYREQ;
else
ev_info->type = PMEV_SUSPENDREQ;
ev_info->index = 0;
clone->notify_status = APM_EV_NOTIFIED;
printf("apm event returning %d\n", ev_info->type);
} else
error = EAGAIN;
ACPI_UNLOCK(acpi);
break;
case APMIO_GETINFO_OLD:
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;
devfs_get_cdevpriv((void **)&clone);
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;
devfs_get_cdevpriv((void **)&clone);
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);
}
void
acpi_apm_init(struct acpi_softc *sc)
{
/* Create a clone for /dev/acpi also. */
STAILQ_INIT(&sc->apm_cdevs);
sc->acpi_clone = apm_create_clone(sc->acpi_dev_t, sc);
make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0660, "apmctl");
make_dev(&apm_cdevsw, 0, UID_ROOT, GID_OPERATOR, 0664, "apm");
}
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