Commit 7726942f authored by Ralf Baechle's avatar Ralf Baechle

[APM] Add shared version of APM emulation

Currently ARM and MIPS both have nearly identical copies of the APM
emulation code in their arch code.  Add yet another copy of it to
drivers char and make it selectable through SYS_SUPPORTS_APM_EMULATION.
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 5986a2ec
......@@ -60,6 +60,8 @@ obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o
obj-$(CONFIG_PRINTER) += lp.o
obj-$(CONFIG_TIPAR) += tipar.o
obj-$(CONFIG_APM_EMULATION) += apm-emulation.o
obj-$(CONFIG_DTLK) += dtlk.o
obj-$(CONFIG_R3964) += n_r3964.o
obj-$(CONFIG_APPLICOM) += applicom.o
......
This diff is collapsed.
/* -*- linux-c -*-
*
* (C) 2003 zecke@handhelds.org
*
* GPL version 2
*
* based on arch/arm/kernel/apm.c
* factor out the information needed by architectures to provide
* apm status
*/
#ifndef __LINUX_APM_EMULATION_H
#define __LINUX_APM_EMULATION_H
#include <linux/apm_bios.h>
/*
* This structure gets filled in by the machine specific 'get_power_status'
* implementation. Any fields which are not set default to a safe value.
*/
struct apm_power_info {
unsigned char ac_line_status;
#define APM_AC_OFFLINE 0
#define APM_AC_ONLINE 1
#define APM_AC_BACKUP 2
#define APM_AC_UNKNOWN 0xff
unsigned char battery_status;
#define APM_BATTERY_STATUS_HIGH 0
#define APM_BATTERY_STATUS_LOW 1
#define APM_BATTERY_STATUS_CRITICAL 2
#define APM_BATTERY_STATUS_CHARGING 3
#define APM_BATTERY_STATUS_NOT_PRESENT 4
#define APM_BATTERY_STATUS_UNKNOWN 0xff
unsigned char battery_flag;
#define APM_BATTERY_FLAG_HIGH (1 << 0)
#define APM_BATTERY_FLAG_LOW (1 << 1)
#define APM_BATTERY_FLAG_CRITICAL (1 << 2)
#define APM_BATTERY_FLAG_CHARGING (1 << 3)
#define APM_BATTERY_FLAG_NOT_PRESENT (1 << 7)
#define APM_BATTERY_FLAG_UNKNOWN 0xff
int battery_life;
int time;
int units;
#define APM_UNITS_MINS 0
#define APM_UNITS_SECS 1
#define APM_UNITS_UNKNOWN -1
};
/*
* This allows machines to provide their own "apm get power status" function.
*/
extern void (*apm_get_power_status)(struct apm_power_info *);
/*
* Queue an event (APM_SYS_SUSPEND or APM_CRITICAL_SUSPEND)
*/
void apm_queue_event(apm_event_t event);
#endif /* __LINUX_APM_EMULATION_H */
......@@ -131,3 +131,29 @@ config SUSPEND_SMP
bool
depends on HOTPLUG_CPU && X86 && PM
default y
config APM_EMULATION
tristate "Advanced Power Management Emulation"
depends on PM && SYS_SUPPORTS_APM_EMULATION
help
APM is a BIOS specification for saving power using several different
techniques. This is mostly useful for battery powered laptops with
APM compliant BIOSes. If you say Y here, the system time will be
reset after a RESUME operation, the /proc/apm device will provide
battery status information, and user-space programs will receive
notification of APM "events" (e.g. battery status change).
In order to use APM, you will need supporting software. For location
and more information, read <file:Documentation/pm.txt> and the
Battery Powered Linux mini-HOWTO, available from
<http://www.tldp.org/docs.html#howto>.
This driver does not spin down disk drives (see the hdparm(8)
manpage ("man 8 hdparm") for that), and it doesn't turn off
VESA-compliant "green" monitors.
Generally, if you don't have a battery in your machine, there isn't
much point in using this driver and you should say N. If you get
random kernel OOPSes or reboots that don't seem to be related to
anything, try disabling/enabling this option (or disabling/enabling
APM in your BIOS).
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