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/***************************************************************************
* *
* Powersave Daemon *
* *
* Copyright (C) 2004,2005 SUSE Linux Products GmbH *
* *
* Author(s): Holger Macht <hmacht@suse.de> *
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License, or (at you *
* option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *
* *
***************************************************************************/
#include <linux/apm_bios.h>
#include <sys/ioctl.h>
#include "globals.h"
#include "apm.h"
#include "fcntl.h"
#include "cpufreq_management.h"
#include "event_management.h"
APM_Interface::APM_Interface():PM_Interface()
{
pDebug(DBG_INFO, "APM constructor");
/* disable temperature control for apm only acpi is supported */
Powersave::Globals::config_obj->current_scheme->ENABLE_THERMAL_MANAGEMENT = OFF;
/* nothing of this exists in apm */
_cooling_mode_supported = false;
_throttleInterface.disableThrottling();
_thermal_trip_points_supported = false;
}
APM_Interface::~APM_Interface()
{
close(_hwEvent_fd);
}
int APM_Interface::openHWEventFD()
{
/* from apmd ... */
/* Return a file descriptor for the apm_bios device, or -1 if there is an
* error. */
if ((_hwEvent_fd = open(APM_BIOS_DEV, O_RDWR)) < 0) {
/* Try to create it.
* Expect major and minor number 10/134
* This should work with driver version 1 and above
* (cannot access version number here)
* power lib does not provide it -> parse /proc/apm for version
* number. Old bios versions may need other major/minor numbers
* These can be read out from /proc/devices.
* do it yourself and send patch if you have such an old system ...
*/
if (mknod(APM_BIOS_DEV, S_IFCHR | S_IRUSR | S_IWUSR, makedev(10, 134))) {
unlink(APM_BIOS_DEV);
return -1;
}
if ((_hwEvent_fd = open(APM_BIOS_DEV, O_RDWR)) < 0) {
/* this should never happen */
pDebug(DBG_DIAG, "Could not open APM device " APM_BIOS_DEV
": '%s', exit.", strerror(errno));
return -1;
}
}
return _hwEvent_fd;
}
int APM_Interface::openAcpidSocket()
{
return 1;
}
int APM_Interface::handleHWEventRequest(int fd)
{
int nr;
// from /usr/include/linux/apm_bios.h
/* Be careful this event structure has nothing to do
with the powersave events. */
apm_event_t events[MAX_EVENTS];
nr = read(_hwEvent_fd, events, MAX_EVENTS * sizeof(apm_event_t)) / sizeof(apm_event_t);
if (nr < 0) {
pDebug(DBG_WARN, "Error reading from apm event file");
return nr;
}
// process events
for (int x = 0; x < nr; x++) {
// code partly pasted from apmd...
switch (events[x]) {
case APM_SYS_STANDBY:
case APM_USER_STANDBY:
if (_sleep_triggered) {
pDebug(DBG_DIAG, "Be careful, endless loop?");
break;
}
pDebug(DBG_INFO, "APM - Standby requested");
/* may happen if sleep is initiated by HW, then
we use standby events at this point
*/
if (_requested_sleep_state == 0) {
pDebug(DBG_DIAG, "Standby requested from BIOS");
_eM->executeEvent("global.standby");
}
break;
case APM_SYS_SUSPEND:
case APM_USER_SUSPEND:
case APM_CRITICAL_SUSPEND:
if (_sleep_triggered) {
pDebug(DBG_DIAG, "Be careful, endless loop?");
break;
}
pDebug(DBG_INFO, "APM - Suspend2(ram/disk) requested.");
/* may happen if sleep is initiated by HW, then
we use suspend2ram events at this point
*/
if (_requested_sleep_state == 0) {
pDebug(DBG_DIAG, "Suspend requested from BIOS");
_eM->executeEvent("global.suspend2ram");
}
break;
case APM_STANDBY_RESUME:
switch (_requested_sleep_state) {
case PSD_SUSPEND2DISK:
pDebug(DBG_DIAG, "Wake up from apm standby, but suspend2disk "
"has been triggered, this is no error");
break;
case PSD_SUSPEND2RAM:
pDebug(DBG_DIAG, "Wake up from apm standby, but suspend2ram "
"has been triggered, this is no error");
break;
case PSD_STANDBY:
pDebug(DBG_DIAG, "Wake up from apm standby");
break;
default:
pDebug(DBG_DIAG, "Resuming from apm standby, no request has been made, "
"propably BIOS has initiated sleep state");
break;
}
break;
// does not happen, according to current kernel
// implementation, driver sets time itself
case APM_UPDATE_TIME:
pDebug(DBG_INFO, "APM - Time updated send from /dev/apm_bios");
break;
// normally suspend should generate NORMAL_RESUME
// don't know when a critical resume could occur,
// all are processed in the same way ...
case APM_NORMAL_RESUME:
case APM_CRITICAL_RESUME:
switch (_requested_sleep_state) {
case PSD_SUSPEND2DISK:
pDebug(DBG_DIAG,
"Wake up from apm suspend, suspend2disk has been triggered");
break;
case PSD_SUSPEND2RAM:
pDebug(DBG_DIAG,
"Wake up from apm suspend, suspend2ram has been triggered");
break;
case PSD_STANDBY:
pDebug(DBG_DIAG,
"Wake up from apm suspend, but standby "
"has been triggered, this is no error");
break;
default:
pDebug(DBG_DIAG,
"Resuming from apm standby, no request has been made"
"propably BIOS has initiated sleep state");
break;
}
_requested_sleep_state = PSD_NO_SLEEP_REQUEST;
_sleep_triggered = false;
// reset frequency which may have changed
// without noticing it.
Powersave::Globals::cpufreq->reinitSpeeds();
break;
case APM_POWER_STATUS_CHANGE:
pDebug(DBG_INFO, "APM - Power status change event occured");
break;
case APM_LOW_BATTERY:
pDebug(DBG_INFO,
"APM - Low Battery event occured");
checkBatteryStateChanges();
break;
#ifdef APM_CAPABILITY_CHANGE
case APM_CAPABILITY_CHANGE:
pDebug(DBG_INFO,
"APM - Capability change event occured");
checkACStateChanges();
checkBatteryStateChanges();
break;
#endif // APM_CAPABILITY_CHANGE
default:
/* other events are not errors,
see the APM BIOS 1.2 spec or apmd.
*/
pDebug(DBG_DIAG,
"Received unknown APM event: 0x%04x.", events[x]);
}
}
// never returns an error at the moment
return 1;
}
void APM_Interface::activateSettings()
{
/* nothing special to do for apm */
PM_Interface::activateSettings();
}
int APM_Interface::suspend_to_ram()
{
sync();
/* ioctl blocks until we are back from suspend */
pDebug(DBG_INFO, "APM - Trigger suspend2ram");
if (ioctl(_hwEvent_fd, APM_IOC_SUSPEND, NULL) < 0) {
pDebug(DBG_ERR, "Could not trigger APM suspend: %s", strerror(errno));
return -1;
}
return 1;
}
int APM_Interface::standby()
{
sync();
pDebug(DBG_INFO, "APM - Trigger standby");
/* ioctl blocks until we are back from standby */
if (ioctl(_hwEvent_fd, APM_IOC_STANDBY, NULL) < 0) {
pDebug(DBG_ERR, "Could not trigger APM standby: %s", strerror(errno));
return -1;
}
return 1;
}
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