apm.c
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- /* -*- linux-c -*-
- * APM BIOS driver for Linux
- * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
- *
- * Initial development of this driver was funded by NEC Australia P/L
- * and NEC Corporation
- *
- * 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, or (at your 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.
- *
- * October 1995, Rik Faith (faith@cs.unc.edu):
- * Minor enhancements and updates (to the patch set) for 1.3.x
- * Documentation
- * January 1996, Rik Faith (faith@cs.unc.edu):
- * Make /proc/apm easy to format (bump driver version)
- * March 1996, Rik Faith (faith@cs.unc.edu):
- * Prohibit APM BIOS calls unless apm_enabled.
- * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
- * April 1996, Stephen Rothwell (sfr@canb.auug.org.au)
- * Version 1.0 and 1.1
- * May 1996, Version 1.2
- * Feb 1998, Version 1.3
- * Feb 1998, Version 1.4
- * Aug 1998, Version 1.5
- * Sep 1998, Version 1.6
- * Nov 1998, Version 1.7
- * Jan 1999, Version 1.8
- * Jan 1999, Version 1.9
- * Oct 1999, Version 1.10
- * Nov 1999, Version 1.11
- * Jan 2000, Version 1.12
- * Feb 2000, Version 1.13
- * Nov 2000, Version 1.14
- * Oct 2001, Version 1.15
- * Jan 2002, Version 1.16
- *
- * History:
- * 0.6b: first version in official kernel, Linux 1.3.46
- * 0.7: changed /proc/apm format, Linux 1.3.58
- * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59
- * 0.9: only call bios if bios is present, Linux 1.3.72
- * 1.0: use fixed device number, consolidate /proc/apm into this file,
- * Linux 1.3.85
- * 1.1: support user-space standby and suspend, power off after system
- * halted, Linux 1.3.98
- * 1.2: When resetting RTC after resume, take care so that the time
- * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
- * <jtoth@princeton.edu>); improve interaction between
- * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
- * 1.2a:Simple change to stop mysterious bug reports with SMP also added
- * levels to the printk calls. APM is not defined for SMP machines.
- * The new replacment for it is, but Linux doesn't yet support this.
- * Alan Cox Linux 2.1.55
- * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's
- * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by
- * Dean Gaudet <dgaudet@arctic.org>.
- * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87
- * 1.5: Fix segment register reloading (in case of bad segments saved
- * across BIOS call).
- * Stephen Rothwell
- * 1.6: Cope with complier/assembler differences.
- * Only try to turn off the first display device.
- * Fix OOPS at power off with no APM BIOS by Jan Echternach
- * <echter@informatik.uni-rostock.de>
- * Stephen Rothwell
- * 1.7: Modify driver's cached copy of the disabled/disengaged flags
- * to reflect current state of APM BIOS.
- * Chris Rankin <rankinc@bellsouth.net>
- * Reset interrupt 0 timer to 100Hz after suspend
- * Chad Miller <cmiller@surfsouth.com>
- * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE
- * Richard Gooch <rgooch@atnf.csiro.au>
- * Allow boot time disabling of APM
- * Make boot messages far less verbose by default
- * Make asm safer
- * Stephen Rothwell
- * 1.8: Add CONFIG_APM_RTC_IS_GMT
- * Richard Gooch <rgooch@atnf.csiro.au>
- * change APM_NOINTS to CONFIG_APM_ALLOW_INTS
- * remove dependency on CONFIG_PROC_FS
- * Stephen Rothwell
- * 1.9: Fix small typo. <laslo@wodip.opole.pl>
- * Try to cope with BIOS's that need to have all display
- * devices blanked and not just the first one.
- * Ross Paterson <ross@soi.city.ac.uk>
- * Fix segment limit setting it has always been wrong as
- * the segments needed to have byte granularity.
- * Mark a few things __init.
- * Add hack to allow power off of SMP systems by popular request.
- * Use CONFIG_SMP instead of __SMP__
- * Ignore BOUNCES for three seconds.
- * Stephen Rothwell
- * 1.10: Fix for Thinkpad return code.
- * Merge 2.2 and 2.3 drivers.
- * Remove APM dependencies in arch/i386/kernel/process.c
- * Remove APM dependencies in drivers/char/sysrq.c
- * Reset time across standby.
- * Allow more inititialisation on SMP.
- * Remove CONFIG_APM_POWER_OFF and make it boot time
- * configurable (default on).
- * Make debug only a boot time parameter (remove APM_DEBUG).
- * Try to blank all devices on any error.
- * 1.11: Remove APM dependencies in drivers/char/console.c
- * Check nr_running to detect if we are idle (from
- * Borislav Deianov <borislav@lix.polytechnique.fr>)
- * Fix for bioses that don't zero the top part of the
- * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>)
- * (reported by Panos Katsaloulis <teras@writeme.com>).
- * Real mode power off patch (Walter Hofmann
- * <Walter.Hofmann@physik.stud.uni-erlangen.de>).
- * 1.12: Remove CONFIG_SMP as the compiler will optimize
- * the code away anyway (smp_num_cpus == 1 in UP)
- * noted by Artur Skawina <skawina@geocities.com>.
- * Make power off under SMP work again.
- * Fix thinko with initial engaging of BIOS.
- * Make sure power off only happens on CPU 0
- * (Paul "Rusty" Russell <rusty@rustcorp.com.au>).
- * Do error notification to user mode if BIOS calls fail.
- * Move entrypoint offset fix to ...boot/setup.S
- * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>).
- * Remove smp-power-off. SMP users must now specify
- * "apm=power-off" on the kernel command line. Suggested
- * by Jim Avera <jima@hal.com>, modified by Alan Cox
- * <alan@lxorguk.ukuu.org.uk>.
- * Register the /proc/apm entry even on SMP so that
- * scripts that check for it before doing power off
- * work (Jim Avera <jima@hal.com>).
- * 1.13: Changes for new pm_ interfaces (Andy Henroid
- * <andy_henroid@yahoo.com>).
- * Modularize the code.
- * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS
- * is now the way life works).
- * Fix thinko in suspend() (wrong return).
- * Notify drivers on critical suspend.
- * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
- * modified by sfr).
- * Disable interrupts while we are suspended (Andy Henroid
- * <andy_henroid@yahoo.com> fixed by sfr).
- * Make power off work on SMP again (Tony Hoyle
- * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr.
- * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore
- * interval is now configurable.
- * 1.14: Make connection version persist across module unload/load.
- * Enable and engage power management earlier.
- * Disengage power management on module unload.
- * Changed to use the sysrq-register hack for registering the
- * power off function called by magic sysrq based upon discussions
- * in irc://irc.openprojects.net/#kernelnewbies
- * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>).
- * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable.
- * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr.
- * Work around byte swap bug in one of the Vaio's BIOS's
- * (Marc Boucher <marc@mbsi.ca>).
- * Exposed the disable flag to dmi so that we can handle known
- * broken APM (Alan Cox <alan@redhat.com>).
- * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin
- * calling it - instead idle. (Alan Cox <alan@redhat.com>)
- * If an APM idle fails log it and idle sensibly
- * 1.15: Don't queue events to clients who open the device O_WRONLY.
- * Don't expect replies from clients who open the device O_RDONLY.
- * (Idea from Thomas Hood <jdthood@mail.com>)
- * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>)
- * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.)
- * Notify listeners of standby or suspend events before notifying
- * drivers. Return EBUSY to ioctl() if suspend is rejected.
- * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood)
- * Ignore first resume after we generate our own resume event
- * after a suspend (Thomas Hood <jdthood@mail.com>)
- * Daemonize now gets rid of our controlling terminal (sfr).
- * CONFIG_APM_CPU_IDLE now just affects the default value of
- * idle_threshold (sfr).
- * Change name of kernel apm daemon (as it no longer idles) (sfr).
- *
- * APM 1.1 Reference:
- *
- * Intel Corporation, Microsoft Corporation. Advanced Power Management
- * (APM) BIOS Interface Specification, Revision 1.1, September 1993.
- * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
- *
- * [This document is available free from Intel by calling 800.628.8686 (fax
- * 916.356.6100) or 800.548.4725; or via anonymous ftp from
- * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
- * available from Microsoft by calling 206.882.8080.]
- *
- * APM 1.2 Reference:
- * Intel Corporation, Microsoft Corporation. Advanced Power Management
- * (APM) BIOS Interface Specification, Revision 1.2, February 1996.
- *
- * [This document is available from Microsoft at:
- * http://www.microsoft.com/hwdev/busbios/amp_12.htm]
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/poll.h>
- #include <linux/types.h>
- #include <linux/stddef.h>
- #include <linux/timer.h>
- #include <linux/fcntl.h>
- #include <linux/slab.h>
- #include <linux/stat.h>
- #include <linux/proc_fs.h>
- #include <linux/miscdevice.h>
- #include <linux/apm_bios.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/pm.h>
- #include <linux/kernel.h>
- #include <linux/smp_lock.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/desc.h>
- #include <linux/sysrq.h>
- extern unsigned long get_cmos_time(void);
- extern void machine_real_restart(unsigned char *, int);
- #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
- extern int (*console_blank_hook)(int);
- #endif
- /*
- * The apm_bios device is one of the misc char devices.
- * This is its minor number.
- */
- #define APM_MINOR_DEV 134
- /*
- * See Documentation/Config.help for the configuration options.
- *
- * Various options can be changed at boot time as follows:
- * (We allow underscores for compatibility with the modules code)
- * apm=on/off enable/disable APM
- * [no-]allow[-_]ints allow interrupts during BIOS calls
- * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call
- * [no-]realmode[-_]power[-_]off switch to real mode before
- * powering off
- * [no-]debug log some debugging messages
- * [no-]power[-_]off power off on shutdown
- * bounce[-_]interval=<n> number of ticks to ignore suspend
- * bounces
- * idle[-_]threshold=<n> System idle percentage above which to
- * make APM BIOS idle calls. Set it to
- * 100 to disable.
- * idle[-_]period=<n> Period (in 1/100s of a second) over
- * which the idle percentage is
- * calculated.
- */
- /* KNOWN PROBLEM MACHINES:
- *
- * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant
- * [Confirmed by TI representative]
- * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification
- * [Confirmed by BIOS disassembly]
- * [This may work now ...]
- * P: Toshiba 1950S: battery life information only gets updated after resume
- * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking
- * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>]
- * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP
- * Neale Banks <neale@lowendale.com.au> December 2000
- *
- * Legend: U = unusable with APM patches
- * P = partially usable with APM patches
- */
- /*
- * Define as 1 to make the driver always call the APM BIOS busy
- * routine even if the clock was not reported as slowed by the
- * idle routine. Otherwise, define as 0.
- */
- #define ALWAYS_CALL_BUSY 1
- /*
- * Define to make the APM BIOS calls zero all data segment registers (so
- * that an incorrect BIOS implementation will cause a kernel panic if it
- * tries to write to arbitrary memory).
- */
- #define APM_ZERO_SEGS
- /*
- * Define to make all _set_limit calls use 64k limits. The APM 1.1 BIOS is
- * supposed to provide limit information that it recognizes. Many machines
- * do this correctly, but many others do not restrict themselves to their
- * claimed limit. When this happens, they will cause a segmentation
- * violation in the kernel at boot time. Most BIOS's, however, will
- * respect a 64k limit, so we use that. If you want to be pedantic and
- * hold your BIOS to its claims, then undefine this.
- */
- #define APM_RELAX_SEGMENTS
- /*
- * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
- * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
- * David Chen <chen@ctpa04.mit.edu>
- */
- #undef INIT_TIMER_AFTER_SUSPEND
- #ifdef INIT_TIMER_AFTER_SUSPEND
- #include <linux/timex.h>
- #include <asm/io.h>
- #include <linux/delay.h>
- #endif
- /*
- * Need to poll the APM BIOS every second
- */
- #define APM_CHECK_TIMEOUT (HZ)
- /*
- * Ignore suspend events for this amount of time after a resume
- */
- #define DEFAULT_BOUNCE_INTERVAL (3 * HZ)
- /*
- * Save a segment register away
- */
- #define savesegment(seg, where)
- __asm__ __volatile__("movl %%" #seg ",%0" : "=m" (where))
- /*
- * Maximum number of events stored
- */
- #define APM_MAX_EVENTS 20
- /*
- * The per-file APM data
- */
- struct apm_user {
- int magic;
- struct apm_user * next;
- int suser: 1;
- int writer: 1;
- int reader: 1;
- int suspend_wait: 1;
- int suspend_result;
- int suspends_pending;
- int standbys_pending;
- int suspends_read;
- int standbys_read;
- int event_head;
- int event_tail;
- apm_event_t events[APM_MAX_EVENTS];
- };
- /*
- * The magic number in apm_user
- */
- #define APM_BIOS_MAGIC 0x4101
- /*
- * idle percentage above which bios idle calls are done
- */
- #ifdef CONFIG_APM_CPU_IDLE
- #define DEFAULT_IDLE_THRESHOLD 95
- #else
- #define DEFAULT_IDLE_THRESHOLD 100
- #endif
- #define DEFAULT_IDLE_PERIOD (100 / 3)
- /*
- * Local variables
- */
- static struct {
- unsigned long offset;
- unsigned short segment;
- } apm_bios_entry;
- static int clock_slowed;
- static int idle_threshold = DEFAULT_IDLE_THRESHOLD;
- static int idle_period = DEFAULT_IDLE_PERIOD;
- static int set_pm_idle;
- static int suspends_pending;
- static int standbys_pending;
- static int ignore_sys_suspend;
- static int ignore_normal_resume;
- static int bounce_interval = DEFAULT_BOUNCE_INTERVAL;
- #ifdef CONFIG_APM_RTC_IS_GMT
- # define clock_cmos_diff 0
- # define got_clock_diff 1
- #else
- static long clock_cmos_diff;
- static int got_clock_diff;
- #endif
- static int debug;
- static int apm_disabled = -1;
- #ifdef CONFIG_SMP
- static int power_off;
- #else
- static int power_off = 1;
- #endif
- #ifdef CONFIG_APM_REAL_MODE_POWER_OFF
- static int realmode_power_off = 1;
- #else
- static int realmode_power_off;
- #endif
- static int exit_kapmd;
- static int kapmd_running;
- #ifdef CONFIG_APM_ALLOW_INTS
- static int allow_ints = 1;
- #else
- static int allow_ints;
- #endif
- static int broken_psr;
- static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
- static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
- static struct apm_user * user_list;
- static char driver_version[] = "1.16"; /* no spaces */
- /*
- * APM event names taken from the APM 1.2 specification. These are
- * the message codes that the BIOS uses to tell us about events
- */
- static char * apm_event_name[] = {
- "system standby",
- "system suspend",
- "normal resume",
- "critical resume",
- "low battery",
- "power status change",
- "update time",
- "critical suspend",
- "user standby",
- "user suspend",
- "system standby resume",
- "capabilities change"
- };
- #define NR_APM_EVENT_NAME
- (sizeof(apm_event_name) / sizeof(apm_event_name[0]))
- typedef struct lookup_t {
- int key;
- char * msg;
- } lookup_t;
- /*
- * The BIOS returns a set of standard error codes in AX when the
- * carry flag is set.
- */
-
- static const lookup_t error_table[] = {
- /* N/A { APM_SUCCESS, "Operation succeeded" }, */
- { APM_DISABLED, "Power management disabled" },
- { APM_CONNECTED, "Real mode interface already connected" },
- { APM_NOT_CONNECTED, "Interface not connected" },
- { APM_16_CONNECTED, "16 bit interface already connected" },
- /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */
- { APM_32_CONNECTED, "32 bit interface already connected" },
- { APM_32_UNSUPPORTED, "32 bit interface not supported" },
- { APM_BAD_DEVICE, "Unrecognized device ID" },
- { APM_BAD_PARAM, "Parameter out of range" },
- { APM_NOT_ENGAGED, "Interface not engaged" },
- { APM_BAD_FUNCTION, "Function not supported" },
- { APM_RESUME_DISABLED, "Resume timer disabled" },
- { APM_BAD_STATE, "Unable to enter requested state" },
- /* N/A { APM_NO_EVENTS, "No events pending" }, */
- { APM_NO_ERROR, "BIOS did not set a return code" },
- { APM_NOT_PRESENT, "No APM present" }
- };
- #define ERROR_COUNT (sizeof(error_table)/sizeof(lookup_t))
- /**
- * apm_error - display an APM error
- * @str: information string
- * @err: APM BIOS return code
- *
- * Write a meaningful log entry to the kernel log in the event of
- * an APM error.
- */
-
- static void apm_error(char *str, int err)
- {
- int i;
- for (i = 0; i < ERROR_COUNT; i++)
- if (error_table[i].key == err) break;
- if (i < ERROR_COUNT)
- printk(KERN_NOTICE "apm: %s: %sn", str, error_table[i].msg);
- else
- printk(KERN_NOTICE "apm: %s: unknown error code %#2.2xn",
- str, err);
- }
- /*
- * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and
- * apm_info.allow_ints, we are being really paranoid here! Not only
- * are interrupts disabled, but all the segment registers (except SS)
- * are saved and zeroed this means that if the BIOS tries to reference
- * any data without explicitly loading the segment registers, the kernel
- * will fault immediately rather than have some unforeseen circumstances
- * for the rest of the kernel. And it will be very obvious! :-) Doing
- * this depends on CS referring to the same physical memory as DS so that
- * DS can be zeroed before the call. Unfortunately, we can't do anything
- * about the stack segment/pointer. Also, we tell the compiler that
- * everything could change.
- *
- * Also, we KNOW that for the non error case of apm_bios_call, there
- * is no useful data returned in the low order 8 bits of eax.
- */
- #define APM_DO_CLI
- if (apm_info.allow_ints)
- __sti();
- else
- __cli();
- #ifdef APM_ZERO_SEGS
- # define APM_DECL_SEGS
- unsigned int saved_fs; unsigned int saved_gs;
- # define APM_DO_SAVE_SEGS
- savesegment(fs, saved_fs); savesegment(gs, saved_gs)
- # define APM_DO_ZERO_SEGS
- "pushl %%dsnt"
- "pushl %%esnt"
- "xorl %%edx, %%edxnt"
- "mov %%dx, %%dsnt"
- "mov %%dx, %%esnt"
- "mov %%dx, %%fsnt"
- "mov %%dx, %%gsnt"
- # define APM_DO_POP_SEGS
- "popl %%esnt"
- "popl %%dsnt"
- # define APM_DO_RESTORE_SEGS
- loadsegment(fs, saved_fs); loadsegment(gs, saved_gs)
- #else
- # define APM_DECL_SEGS
- # define APM_DO_SAVE_SEGS
- # define APM_DO_ZERO_SEGS
- # define APM_DO_POP_SEGS
- # define APM_DO_RESTORE_SEGS
- #endif
- /**
- * apm_bios_call - Make an APM BIOS 32bit call
- * @func: APM function to execute
- * @ebx_in: EBX register for call entry
- * @ecx_in: ECX register for call entry
- * @eax: EAX register return
- * @ebx: EBX register return
- * @ecx: ECX register return
- * @edx: EDX register return
- * @esi: ESI register return
- *
- * Make an APM call using the 32bit protected mode interface. The
- * caller is responsible for knowing if APM BIOS is configured and
- * enabled. This call can disable interrupts for a long period of
- * time on some laptops. The return value is in AH and the carry
- * flag is loaded into AL. If there is an error, then the error
- * code is returned in AH (bits 8-15 of eax) and this function
- * returns non-zero.
- */
-
- static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in,
- u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi)
- {
- APM_DECL_SEGS
- unsigned long flags;
- __save_flags(flags);
- APM_DO_CLI;
- APM_DO_SAVE_SEGS;
- /*
- * N.B. We do NOT need a cld after the BIOS call
- * because we always save and restore the flags.
- */
- __asm__ __volatile__(APM_DO_ZERO_SEGS
- "pushl %%edint"
- "pushl %%ebpnt"
- "lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "nt"
- "setc %%alnt"
- "popl %%ebpnt"
- "popl %%edint"
- APM_DO_POP_SEGS
- : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx),
- "=S" (*esi)
- : "a" (func), "b" (ebx_in), "c" (ecx_in)
- : "memory", "cc");
- APM_DO_RESTORE_SEGS;
- __restore_flags(flags);
- return *eax & 0xff;
- }
- /**
- * apm_bios_call_simple - make a simple APM BIOS 32bit call
- * @func: APM function to invoke
- * @ebx_in: EBX register value for BIOS call
- * @ecx_in: ECX register value for BIOS call
- * @eax: EAX register on return from the BIOS call
- *
- * Make a BIOS call that does only returns one value, or just status.
- * If there is an error, then the error code is returned in AH
- * (bits 8-15 of eax) and this function returns non-zero. This is
- * used for simpler BIOS operations. This call may hold interrupts
- * off for a long time on some laptops.
- */
- static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax)
- {
- u8 error;
- APM_DECL_SEGS
- unsigned long flags;
- __save_flags(flags);
- APM_DO_CLI;
- APM_DO_SAVE_SEGS;
- {
- int cx, dx, si;
- /*
- * N.B. We do NOT need a cld after the BIOS call
- * because we always save and restore the flags.
- */
- __asm__ __volatile__(APM_DO_ZERO_SEGS
- "pushl %%edint"
- "pushl %%ebpnt"
- "lcall %%cs:" SYMBOL_NAME_STR(apm_bios_entry) "nt"
- "setc %%blnt"
- "popl %%ebpnt"
- "popl %%edint"
- APM_DO_POP_SEGS
- : "=a" (*eax), "=b" (error), "=c" (cx), "=d" (dx),
- "=S" (si)
- : "a" (func), "b" (ebx_in), "c" (ecx_in)
- : "memory", "cc");
- }
- APM_DO_RESTORE_SEGS;
- __restore_flags(flags);
- return error;
- }
- /**
- * apm_driver_version - APM driver version
- * @val: loaded with the APM version on return
- *
- * Retrieve the APM version supported by the BIOS. This is only
- * supported for APM 1.1 or higher. An error indicates APM 1.0 is
- * probably present.
- *
- * On entry val should point to a value indicating the APM driver
- * version with the high byte being the major and the low byte the
- * minor number both in BCD
- *
- * On return it will hold the BIOS revision supported in the
- * same format.
- */
- static int __init apm_driver_version(u_short *val)
- {
- u32 eax;
- if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax))
- return (eax >> 8) & 0xff;
- *val = eax;
- return APM_SUCCESS;
- }
- /**
- * apm_get_event - get an APM event from the BIOS
- * @event: pointer to the event
- * @info: point to the event information
- *
- * The APM BIOS provides a polled information for event
- * reporting. The BIOS expects to be polled at least every second
- * when events are pending. When a message is found the caller should
- * poll until no more messages are present. However, this causes
- * problems on some laptops where a suspend event notification is
- * not cleared until it is acknowledged.
- *
- * Additional information is returned in the info pointer, providing
- * that APM 1.2 is in use. If no messges are pending the value 0x80
- * is returned (No power management events pending).
- */
-
- static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info)
- {
- u32 eax;
- u32 ebx;
- u32 ecx;
- u32 dummy;
- if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx,
- &dummy, &dummy))
- return (eax >> 8) & 0xff;
- *event = ebx;
- if (apm_info.connection_version < 0x0102)
- *info = ~0; /* indicate info not valid */
- else
- *info = ecx;
- return APM_SUCCESS;
- }
- /**
- * set_power_state - set the power management state
- * @what: which items to transition
- * @state: state to transition to
- *
- * Request an APM change of state for one or more system devices. The
- * processor state must be transitioned last of all. what holds the
- * class of device in the upper byte and the device number (0xFF for
- * all) for the object to be transitioned.
- *
- * The state holds the state to transition to, which may in fact
- * be an acceptance of a BIOS requested state change.
- */
-
- static int set_power_state(u_short what, u_short state)
- {
- u32 eax;
- if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax))
- return (eax >> 8) & 0xff;
- return APM_SUCCESS;
- }
- /**
- * set_system_power_state - set system wide power state
- * @state: which state to enter
- *
- * Transition the entire system into a new APM power state.
- */
-
- static int set_system_power_state(u_short state)
- {
- return set_power_state(APM_DEVICE_ALL, state);
- }
- /**
- * apm_do_idle - perform power saving
- *
- * This function notifies the BIOS that the processor is (in the view
- * of the OS) idle. It returns -1 in the event that the BIOS refuses
- * to handle the idle request. On a success the function returns 1
- * if the BIOS did clock slowing or 0 otherwise.
- */
-
- static int apm_do_idle(void)
- {
- u32 eax;
- if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
- static unsigned long t;
- if (time_after(jiffies, t + 10 * HZ)) {
- printk(KERN_DEBUG "apm_do_idle failed (%d)n",
- (eax >> 8) & 0xff);
- t = jiffies;
- }
- return -1;
- }
- clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
- return clock_slowed;
- }
- /**
- * apm_do_busy - inform the BIOS the CPU is busy
- *
- * Request that the BIOS brings the CPU back to full performance.
- */
-
- static void apm_do_busy(void)
- {
- u32 dummy;
- if (clock_slowed || ALWAYS_CALL_BUSY) {
- (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy);
- clock_slowed = 0;
- }
- }
- /*
- * If no process has really been interested in
- * the CPU for some time, we want to call BIOS
- * power management - we probably want
- * to conserve power.
- */
- #define IDLE_CALC_LIMIT (HZ * 100)
- #define IDLE_LEAKY_MAX 16
- static void (*original_pm_idle)(void);
- extern void default_idle(void);
- /**
- * apm_cpu_idle - cpu idling for APM capable Linux
- *
- * This is the idling function the kernel executes when APM is available. It
- * tries to do BIOS powermanagement based on the average system idle time.
- * Furthermore it calls the system default idle routine.
- */
- static void apm_cpu_idle(void)
- {
- static int use_apm_idle; /* = 0 */
- static unsigned int last_jiffies; /* = 0 */
- static unsigned int last_stime; /* = 0 */
- int apm_idle_done = 0;
- unsigned int jiffies_since_last_check = jiffies - last_jiffies;
- unsigned int bucket;
- recalc:
- if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
- use_apm_idle = 0;
- last_jiffies = jiffies;
- last_stime = current->times.tms_stime;
- } else if (jiffies_since_last_check > idle_period) {
- unsigned int idle_percentage;
- idle_percentage = current->times.tms_stime - last_stime;
- idle_percentage *= 100;
- idle_percentage /= jiffies_since_last_check;
- use_apm_idle = (idle_percentage > idle_threshold);
- last_jiffies = jiffies;
- last_stime = current->times.tms_stime;
- }
- bucket = IDLE_LEAKY_MAX;
- while (!current->need_resched) {
- if (use_apm_idle) {
- unsigned int t;
- t = jiffies;
- switch (apm_do_idle()) {
- case 0: apm_idle_done = 1;
- if (t != jiffies) {
- if (bucket) {
- bucket = IDLE_LEAKY_MAX;
- continue;
- }
- } else if (bucket) {
- bucket--;
- continue;
- }
- break;
- case 1: apm_idle_done = 1;
- break;
- default: /* BIOS refused */
- break;
- }
- }
- if (original_pm_idle)
- original_pm_idle();
- else
- default_idle();
- jiffies_since_last_check = jiffies - last_jiffies;
- if (jiffies_since_last_check > idle_period)
- goto recalc;
- }
- if (apm_idle_done)
- apm_do_busy();
- }
- /**
- * apm_power_off - ask the BIOS to power off
- *
- * Handle the power off sequence. This is the one piece of code we
- * will execute even on SMP machines. In order to deal with BIOS
- * bugs we support real mode APM BIOS power off calls. We also make
- * the SMP call on CPU0 as some systems will only honour this call
- * on their first cpu.
- */
-
- static void apm_power_off(void)
- {
- unsigned char po_bios_call[] = {
- 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
- 0x8e, 0xd0, /* movw ax,ss */
- 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
- 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
- 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
- 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
- 0xcd, 0x15 /* int $0x15 */
- };
- /*
- * This may be called on an SMP machine.
- */
- #ifdef CONFIG_SMP
- /* Some bioses don't like being called from CPU != 0 */
- if (cpu_number_map(smp_processor_id()) != 0) {
- current->cpus_allowed = 1;
- schedule();
- if (unlikely(cpu_number_map(smp_processor_id()) != 0))
- BUG();
- }
- #endif
- if (apm_info.realmode_power_off)
- machine_real_restart(po_bios_call, sizeof(po_bios_call));
- else
- (void) set_system_power_state(APM_STATE_OFF);
- }
- /**
- * handle_poweroff - sysrq callback for power down
- * @key: key pressed (unused)
- * @pt_regs: register state (unused)
- * @kbd: keyboard state (unused)
- * @tty: tty involved (unused)
- *
- * When the user hits Sys-Rq o to power down the machine this is the
- * callback we use.
- */
- void handle_poweroff (int key, struct pt_regs *pt_regs,
- struct kbd_struct *kbd, struct tty_struct *tty) {
- apm_power_off();
- }
- struct sysrq_key_op sysrq_poweroff_op = {
- handler: handle_poweroff,
- help_msg: "Off",
- action_msg: "Power Offn"
- };
- #ifdef CONFIG_APM_DO_ENABLE
- /**
- * apm_enable_power_management - enable BIOS APM power management
- * @enable: enable yes/no
- *
- * Enable or disable the APM BIOS power services.
- */
-
- static int apm_enable_power_management(int enable)
- {
- u32 eax;
- if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
- return APM_NOT_ENGAGED;
- if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
- enable, &eax))
- return (eax >> 8) & 0xff;
- if (enable)
- apm_info.bios.flags &= ~APM_BIOS_DISABLED;
- else
- apm_info.bios.flags |= APM_BIOS_DISABLED;
- return APM_SUCCESS;
- }
- #endif
- /**
- * apm_get_power_status - get current power state
- * @status: returned status
- * @bat: battery info
- * @life: estimated life
- *
- * Obtain the current power status from the APM BIOS. We return a
- * status which gives the rough battery status, and current power
- * source. The bat value returned give an estimate as a percentage
- * of life and a status value for the battery. The estimated life
- * if reported is a lifetime in secodnds/minutes at current powwer
- * consumption.
- */
-
- static int apm_get_power_status(u_short *status, u_short *bat, u_short *life)
- {
- u32 eax;
- u32 ebx;
- u32 ecx;
- u32 edx;
- u32 dummy;
- if (apm_info.get_power_status_broken)
- return APM_32_UNSUPPORTED;
- if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
- &eax, &ebx, &ecx, &edx, &dummy))
- return (eax >> 8) & 0xff;
- *status = ebx;
- *bat = ecx;
- if (apm_info.get_power_status_swabinminutes) {
- *life = swab16((u16)edx);
- *life |= 0x8000;
- } else
- *life = edx;
- return APM_SUCCESS;
- }
- #if 0
- static int apm_get_battery_status(u_short which, u_short *status,
- u_short *bat, u_short *life, u_short *nbat)
- {
- u32 eax;
- u32 ebx;
- u32 ecx;
- u32 edx;
- u32 esi;
- if (apm_info.connection_version < 0x0102) {
- /* pretend we only have one battery. */
- if (which != 1)
- return APM_BAD_DEVICE;
- *nbat = 1;
- return apm_get_power_status(status, bat, life);
- }
- if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax,
- &ebx, &ecx, &edx, &esi))
- return (eax >> 8) & 0xff;
- *status = ebx;
- *bat = ecx;
- *life = edx;
- *nbat = esi;
- return APM_SUCCESS;
- }
- #endif
- /**
- * apm_engage_power_management - enable PM on a device
- * @device: identity of device
- * @enable: on/off
- *
- * Activate or deactive power management on either a specific device
- * or the entire system (%APM_DEVICE_ALL).
- */
-
- static int apm_engage_power_management(u_short device, int enable)
- {
- u32 eax;
- if ((enable == 0) && (device == APM_DEVICE_ALL)
- && (apm_info.bios.flags & APM_BIOS_DISABLED))
- return APM_DISABLED;
- if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
- return (eax >> 8) & 0xff;
- if (device == APM_DEVICE_ALL) {
- if (enable)
- apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
- else
- apm_info.bios.flags |= APM_BIOS_DISENGAGED;
- }
- return APM_SUCCESS;
- }
- #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
- /**
- * apm_console_blank - blank the display
- * @blank: on/off
- *
- * Attempt to blank the console, firstly by blanking just video device
- * zero, and if that fails (some BIOSes dont support it) then it blanks
- * all video devices. Typically the BIOS will do laptop backlight and
- * monitor powerdown for us.
- */
-
- static int apm_console_blank(int blank)
- {
- int error;
- u_short state;
- state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
- /* Blank the first display device */
- error = set_power_state(0x100, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
- /* try to blank them all instead */
- error = set_power_state(0x1ff, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
- /* try to blank device one instead */
- error = set_power_state(0x101, state);
- }
- if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
- return 1;
- apm_error("set display", error);
- return 0;
- }
- #endif
- static int queue_empty(struct apm_user *as)
- {
- return as->event_head == as->event_tail;
- }
- static apm_event_t get_queued_event(struct apm_user *as)
- {
- as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
- return as->events[as->event_tail];
- }
- static void queue_event(apm_event_t event, struct apm_user *sender)
- {
- struct apm_user * as;
- if (user_list == NULL)
- return;
- for (as = user_list; as != NULL; as = as->next) {
- if ((as == sender) || (!as->reader))
- continue;
- as->event_head = (as->event_head + 1) % APM_MAX_EVENTS;
- if (as->event_head == as->event_tail) {
- static int notified;
- if (notified++ == 0)
- printk(KERN_ERR "apm: an event queue overflowedn");
- as->event_tail = (as->event_tail + 1) % APM_MAX_EVENTS;
- }
- as->events[as->event_head] = event;
- if ((!as->suser) || (!as->writer))
- continue;
- switch (event) {
- case APM_SYS_SUSPEND:
- case APM_USER_SUSPEND:
- as->suspends_pending++;
- suspends_pending++;
- break;
- case APM_SYS_STANDBY:
- case APM_USER_STANDBY:
- as->standbys_pending++;
- standbys_pending++;
- break;
- }
- }
- wake_up_interruptible(&apm_waitqueue);
- }
- static void set_time(void)
- {
- unsigned long flags;
- if (got_clock_diff) { /* Must know time zone in order to set clock */
- save_flags(flags);
- cli();
- CURRENT_TIME = get_cmos_time() + clock_cmos_diff;
- restore_flags(flags);
- }
- }
- static void get_time_diff(void)
- {
- #ifndef CONFIG_APM_RTC_IS_GMT
- unsigned long flags;
- /*
- * Estimate time zone so that set_time can update the clock
- */
- save_flags(flags);
- clock_cmos_diff = -get_cmos_time();
- cli();
- clock_cmos_diff += CURRENT_TIME;
- got_clock_diff = 1;
- restore_flags(flags);
- #endif
- }
- static void reinit_timer(void)
- {
- #ifdef INIT_TIMER_AFTER_SUSPEND
- unsigned long flags;
- save_flags(flags);
- cli();
- /* set the clock to 100 Hz */
- outb_p(0x34,0x43); /* binary, mode 2, LSB/MSB, ch 0 */
- udelay(10);
- outb_p(LATCH & 0xff , 0x40); /* LSB */
- udelay(10);
- outb(LATCH >> 8 , 0x40); /* MSB */
- udelay(10);
- restore_flags(flags);
- #endif
- }
- static int suspend(int vetoable)
- {
- int err;
- struct apm_user *as;
- if (pm_send_all(PM_SUSPEND, (void *)3)) {
- /* Vetoed */
- if (vetoable) {
- if (apm_info.connection_version > 0x100)
- set_system_power_state(APM_STATE_REJECT);
- err = -EBUSY;
- ignore_sys_suspend = 0;
- printk(KERN_WARNING "apm: suspend was vetoed.n");
- goto out;
- }
- printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.n");
- }
- get_time_diff();
- __cli();
- err = set_system_power_state(APM_STATE_SUSPEND);
- reinit_timer();
- set_time();
- ignore_normal_resume = 1;
- __sti();
- if (err == APM_NO_ERROR)
- err = APM_SUCCESS;
- if (err != APM_SUCCESS)
- apm_error("suspend", err);
- err = (err == APM_SUCCESS) ? 0 : -EIO;
- pm_send_all(PM_RESUME, (void *)0);
- queue_event(APM_NORMAL_RESUME, NULL);
- out:
- for (as = user_list; as != NULL; as = as->next) {
- as->suspend_wait = 0;
- as->suspend_result = err;
- }
- wake_up_interruptible(&apm_suspend_waitqueue);
- return err;
- }
- static void standby(void)
- {
- int err;
- /* If needed, notify drivers here */
- get_time_diff();
- err = set_system_power_state(APM_STATE_STANDBY);
- if ((err != APM_SUCCESS) && (err != APM_NO_ERROR))
- apm_error("standby", err);
- }
- static apm_event_t get_event(void)
- {
- int error;
- apm_event_t event;
- apm_eventinfo_t info;
- static int notified;
- /* we don't use the eventinfo */
- error = apm_get_event(&event, &info);
- if (error == APM_SUCCESS)
- return event;
- if ((error != APM_NO_EVENTS) && (notified++ == 0))
- apm_error("get_event", error);
- return 0;
- }
- static void check_events(void)
- {
- apm_event_t event;
- static unsigned long last_resume;
- static int ignore_bounce;
- while ((event = get_event()) != 0) {
- if (debug) {
- if (event <= NR_APM_EVENT_NAME)
- printk(KERN_DEBUG "apm: received %s notifyn",
- apm_event_name[event - 1]);
- else
- printk(KERN_DEBUG "apm: received unknown "
- "event 0x%02xn", event);
- }
- if (ignore_bounce
- && ((jiffies - last_resume) > bounce_interval))
- ignore_bounce = 0;
- switch (event) {
- case APM_SYS_STANDBY:
- case APM_USER_STANDBY:
- queue_event(event, NULL);
- if (standbys_pending <= 0)
- standby();
- break;
- case APM_USER_SUSPEND:
- #ifdef CONFIG_APM_IGNORE_USER_SUSPEND
- if (apm_info.connection_version > 0x100)
- set_system_power_state(APM_STATE_REJECT);
- break;
- #endif
- case APM_SYS_SUSPEND:
- if (ignore_bounce) {
- if (apm_info.connection_version > 0x100)
- set_system_power_state(APM_STATE_REJECT);
- break;
- }
- /*
- * If we are already processing a SUSPEND,
- * then further SUSPEND events from the BIOS
- * will be ignored. We also return here to
- * cope with the fact that the Thinkpads keep
- * sending a SUSPEND event until something else
- * happens!
- */
- if (ignore_sys_suspend)
- return;
- ignore_sys_suspend = 1;
- queue_event(event, NULL);
- if (suspends_pending <= 0)
- (void) suspend(1);
- break;
- case APM_NORMAL_RESUME:
- case APM_CRITICAL_RESUME:
- case APM_STANDBY_RESUME:
- ignore_sys_suspend = 0;
- last_resume = jiffies;
- ignore_bounce = 1;
- if ((event != APM_NORMAL_RESUME)
- || (ignore_normal_resume == 0)) {
- set_time();
- pm_send_all(PM_RESUME, (void *)0);
- queue_event(event, NULL);
- }
- ignore_normal_resume = 0;
- break;
- case APM_CAPABILITY_CHANGE:
- case APM_LOW_BATTERY:
- case APM_POWER_STATUS_CHANGE:
- queue_event(event, NULL);
- /* If needed, notify drivers here */
- break;
- case APM_UPDATE_TIME:
- set_time();
- break;
- case APM_CRITICAL_SUSPEND:
- /*
- * We are not allowed to reject a critical suspend.
- */
- (void) suspend(0);
- break;
- }
- }
- }
- static void apm_event_handler(void)
- {
- static int pending_count = 4;
- int err;
- if ((standbys_pending > 0) || (suspends_pending > 0)) {
- if ((apm_info.connection_version > 0x100) &&
- (pending_count-- <= 0)) {
- pending_count = 4;
- if (debug)
- printk(KERN_DEBUG "apm: setting state busyn");
- err = set_system_power_state(APM_STATE_BUSY);
- if (err)
- apm_error("busy", err);
- }
- } else
- pending_count = 4;
- check_events();
- }
- /*
- * This is the APM thread main loop.
- */
- static void apm_mainloop(void)
- {
- DECLARE_WAITQUEUE(wait, current);
- add_wait_queue(&apm_waitqueue, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- for (;;) {
- schedule_timeout(APM_CHECK_TIMEOUT);
- if (exit_kapmd)
- break;
- /*
- * Ok, check all events, check for idle (and mark us sleeping
- * so as not to count towards the load average)..
- */
- set_current_state(TASK_INTERRUPTIBLE);
- apm_event_handler();
- }
- remove_wait_queue(&apm_waitqueue, &wait);
- }
- static int check_apm_user(struct apm_user *as, const char *func)
- {
- if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) {
- printk(KERN_ERR "apm: %s passed bad filpn", func);
- return 1;
- }
- return 0;
- }
- static ssize_t do_read(struct file *fp, char *buf, size_t count, loff_t *ppos)
- {
- struct apm_user * as;
- int i;
- apm_event_t event;
- as = fp->private_data;
- if (check_apm_user(as, "read"))
- return -EIO;
- if (count < sizeof(apm_event_t))
- return -EINVAL;
- if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK))
- return -EAGAIN;
- wait_event_interruptible(apm_waitqueue, !queue_empty(as));
- i = count;
- while ((i >= sizeof(event)) && !queue_empty(as)) {
- event = get_queued_event(as);
- if (copy_to_user(buf, &event, sizeof(event))) {
- if (i < count)
- break;
- return -EFAULT;
- }
- switch (event) {
- case APM_SYS_SUSPEND:
- case APM_USER_SUSPEND:
- as->suspends_read++;
- break;
- case APM_SYS_STANDBY:
- case APM_USER_STANDBY:
- as->standbys_read++;
- break;
- }
- buf += sizeof(event);
- i -= sizeof(event);
- }
- if (i < count)
- return count - i;
- if (signal_pending(current))
- return -ERESTARTSYS;
- return 0;
- }
- static unsigned int do_poll(struct file *fp, poll_table * wait)
- {
- struct apm_user * as;
- as = fp->private_data;
- if (check_apm_user(as, "poll"))
- return 0;
- poll_wait(fp, &apm_waitqueue, wait);
- if (!queue_empty(as))
- return POLLIN | POLLRDNORM;
- return 0;
- }
- static int do_ioctl(struct inode * inode, struct file *filp,
- u_int cmd, u_long arg)
- {
- struct apm_user * as;
- as = filp->private_data;
- if (check_apm_user(as, "ioctl"))
- return -EIO;
- if ((!as->suser) || (!as->writer))
- return -EPERM;
- switch (cmd) {
- case APM_IOC_STANDBY:
- if (as->standbys_read > 0) {
- as->standbys_read--;
- as->standbys_pending--;
- standbys_pending--;
- } else
- queue_event(APM_USER_STANDBY, as);
- if (standbys_pending <= 0)
- standby();
- break;
- case APM_IOC_SUSPEND:
- if (as->suspends_read > 0) {
- as->suspends_read--;
- as->suspends_pending--;
- suspends_pending--;
- } else
- queue_event(APM_USER_SUSPEND, as);
- if (suspends_pending <= 0) {
- return suspend(1);
- } else {
- as->suspend_wait = 1;
- wait_event_interruptible(apm_suspend_waitqueue,
- as->suspend_wait == 0);
- return as->suspend_result;
- }
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static int do_release(struct inode * inode, struct file * filp)
- {
- struct apm_user * as;
- as = filp->private_data;
- if (check_apm_user(as, "release"))
- return 0;
- filp->private_data = NULL;
- lock_kernel();
- if (as->standbys_pending > 0) {
- standbys_pending -= as->standbys_pending;
- if (standbys_pending <= 0)
- standby();
- }
- if (as->suspends_pending > 0) {
- suspends_pending -= as->suspends_pending;
- if (suspends_pending <= 0)
- (void) suspend(1);
- }
- if (user_list == as)
- user_list = as->next;
- else {
- struct apm_user * as1;
- for (as1 = user_list;
- (as1 != NULL) && (as1->next != as);
- as1 = as1->next)
- ;
- if (as1 == NULL)
- printk(KERN_ERR "apm: filp not in user listn");
- else
- as1->next = as->next;
- }
- unlock_kernel();
- kfree(as);
- return 0;
- }
- static int do_open(struct inode * inode, struct file * filp)
- {
- struct apm_user * as;
- as = (struct apm_user *)kmalloc(sizeof(*as), GFP_KERNEL);
- if (as == NULL) {
- printk(KERN_ERR "apm: cannot allocate struct of size %d bytesn",
- sizeof(*as));
- return -ENOMEM;
- }
- as->magic = APM_BIOS_MAGIC;
- as->event_tail = as->event_head = 0;
- as->suspends_pending = as->standbys_pending = 0;
- as->suspends_read = as->standbys_read = 0;
- /*
- * XXX - this is a tiny bit broken, when we consider BSD
- * process accounting. If the device is opened by root, we
- * instantly flag that we used superuser privs. Who knows,
- * we might close the device immediately without doing a
- * privileged operation -- cevans
- */
- as->suser = capable(CAP_SYS_ADMIN);
- as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE;
- as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ;
- as->next = user_list;
- user_list = as;
- filp->private_data = as;
- return 0;
- }
- static int apm_get_info(char *buf, char **start, off_t fpos, int length)
- {
- char * p;
- unsigned short bx;
- unsigned short cx;
- unsigned short dx;
- int error;
- unsigned short ac_line_status = 0xff;
- unsigned short battery_status = 0xff;
- unsigned short battery_flag = 0xff;
- int percentage = -1;
- int time_units = -1;
- char *units = "?";
- p = buf;
- if ((smp_num_cpus == 1) &&
- !(error = apm_get_power_status(&bx, &cx, &dx))) {
- ac_line_status = (bx >> 8) & 0xff;
- battery_status = bx & 0xff;
- if ((cx & 0xff) != 0xff)
- percentage = cx & 0xff;
- if (apm_info.connection_version > 0x100) {
- battery_flag = (cx >> 8) & 0xff;
- if (dx != 0xffff) {
- units = (dx & 0x8000) ? "min" : "sec";
- time_units = dx & 0x7fff;
- }
- }
- }
- /* Arguments, with symbols from linux/apm_bios.h. Information is
- from the Get Power Status (0x0a) call unless otherwise noted.
- 0) Linux driver version (this will change if format changes)
- 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2.
- 2) APM flags from APM Installation Check (0x00):
- bit 0: APM_16_BIT_SUPPORT
- bit 1: APM_32_BIT_SUPPORT
- bit 2: APM_IDLE_SLOWS_CLOCK
- bit 3: APM_BIOS_DISABLED
- bit 4: APM_BIOS_DISENGAGED
- 3) AC line status
- 0x00: Off-line
- 0x01: On-line
- 0x02: On backup power (BIOS >= 1.1 only)
- 0xff: Unknown
- 4) Battery status
- 0x00: High
- 0x01: Low
- 0x02: Critical
- 0x03: Charging
- 0x04: Selected battery not present (BIOS >= 1.2 only)
- 0xff: Unknown
- 5) Battery flag
- bit 0: High
- bit 1: Low
- bit 2: Critical
- bit 3: Charging
- bit 7: No system battery
- 0xff: Unknown
- 6) Remaining battery life (percentage of charge):
- 0-100: valid
- -1: Unknown
- 7) Remaining battery life (time units):
- Number of remaining minutes or seconds
- -1: Unknown
- 8) min = minutes; sec = seconds */
- p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %sn",
- driver_version,
- (apm_info.bios.version >> 8) & 0xff,
- apm_info.bios.version & 0xff,
- apm_info.bios.flags,
- ac_line_status,
- battery_status,
- battery_flag,
- percentage,
- time_units,
- units);
- return p - buf;
- }
- static int apm(void *unused)
- {
- unsigned short bx;
- unsigned short cx;
- unsigned short dx;
- int error;
- char * power_stat;
- char * bat_stat;
- kapmd_running = 1;
- daemonize();
- strcpy(current->comm, "kapmd");
- sigfillset(¤t->blocked);
- #ifdef CONFIG_SMP
- /* 2002/08/01 - WT
- * This is to avoid random crashes at boot time during initialization
- * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D.
- * Some bioses don't like being called from CPU != 0.
- * Method suggested by Ingo Molnar.
- */
- if (cpu_number_map(smp_processor_id()) != 0) {
- current->cpus_allowed = 1;
- schedule();
- if (unlikely(cpu_number_map(smp_processor_id()) != 0))
- BUG();
- }
- #endif
-
- if (apm_info.connection_version == 0) {
- apm_info.connection_version = apm_info.bios.version;
- if (apm_info.connection_version > 0x100) {
- /*
- * We only support BIOSs up to version 1.2
- */
- if (apm_info.connection_version > 0x0102)
- apm_info.connection_version = 0x0102;
- error = apm_driver_version(&apm_info.connection_version);
- if (error != APM_SUCCESS) {
- apm_error("driver version", error);
- /* Fall back to an APM 1.0 connection. */
- apm_info.connection_version = 0x100;
- }
- }
- }
- if (debug)
- printk(KERN_INFO "apm: Connection version %d.%dn",
- (apm_info.connection_version >> 8) & 0xff,
- apm_info.connection_version & 0xff);
- #ifdef CONFIG_APM_DO_ENABLE
- if (apm_info.bios.flags & APM_BIOS_DISABLED) {
- /*
- * This call causes my NEC UltraLite Versa 33/C to hang if it
- * is booted with PM disabled but not in the docking station.
- * Unfortunate ...
- */
- error = apm_enable_power_management(1);
- if (error) {
- apm_error("enable power management", error);
- return -1;
- }
- }
- #endif
- if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
- && (apm_info.connection_version > 0x0100)) {
- error = apm_engage_power_management(APM_DEVICE_ALL, 1);
- if (error) {
- apm_error("engage power management", error);
- return -1;
- }
- }
- if (debug) {
- error = apm_get_power_status(&bx, &cx, &dx);
- if (error)
- printk(KERN_INFO "apm: power status not availablen");
- else {
- switch ((bx >> 8) & 0xff) {
- case 0: power_stat = "off line"; break;
- case 1: power_stat = "on line"; break;
- case 2: power_stat = "on backup power"; break;
- default: power_stat = "unknown"; break;
- }
- switch (bx & 0xff) {
- case 0: bat_stat = "high"; break;
- case 1: bat_stat = "low"; break;
- case 2: bat_stat = "critical"; break;
- case 3: bat_stat = "charging"; break;
- default: bat_stat = "unknown"; break;
- }
- printk(KERN_INFO
- "apm: AC %s, battery status %s, battery life ",
- power_stat, bat_stat);
- if ((cx & 0xff) == 0xff)
- printk("unknownn");
- else
- printk("%d%%n", cx & 0xff);
- if (apm_info.connection_version > 0x100) {
- printk(KERN_INFO
- "apm: battery flag 0x%02x, battery life ",
- (cx >> 8) & 0xff);
- if (dx == 0xffff)
- printk("unknownn");
- else
- printk("%d %sn", dx & 0x7fff,
- (dx & 0x8000) ?
- "minutes" : "seconds");
- }
- }
- }
- /* Install our power off handler.. */
- if (power_off)
- pm_power_off = apm_power_off;
- register_sysrq_key('o', &sysrq_poweroff_op);
- if (smp_num_cpus == 1) {
- #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
- console_blank_hook = apm_console_blank;
- #endif
- apm_mainloop();
- #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT)
- console_blank_hook = NULL;
- #endif
- }
- kapmd_running = 0;
- return 0;
- }
- #ifndef MODULE
- static int __init apm_setup(char *str)
- {
- int invert;
- while ((str != NULL) && (*str != ' ')) {
- if (strncmp(str, "off", 3) == 0)
- apm_disabled = 1;
- if (strncmp(str, "on", 2) == 0)
- apm_disabled = 0;
- if ((strncmp(str, "bounce-interval=", 16) == 0) ||
- (strncmp(str, "bounce_interval=", 16) == 0))
- bounce_interval = simple_strtol(str + 16, NULL, 0);
- if ((strncmp(str, "idle-threshold=", 15) == 0) ||
- (strncmp(str, "idle_threshold=", 15) == 0))
- idle_threshold = simple_strtol(str + 15, NULL, 0);
- if ((strncmp(str, "idle-period=", 12) == 0) ||
- (strncmp(str, "idle_period=", 12) == 0))
- idle_period = simple_strtol(str + 12, NULL, 0);
- invert = (strncmp(str, "no-", 3) == 0) ||
- (strncmp(str, "no_", 3) == 0);
- if (invert)
- str += 3;
- if (strncmp(str, "debug", 5) == 0)
- debug = !invert;
- if ((strncmp(str, "power-off", 9) == 0) ||
- (strncmp(str, "power_off", 9) == 0))
- power_off = !invert;
- if ((strncmp(str, "allow-ints", 10) == 0) ||
- (strncmp(str, "allow_ints", 10) == 0))
- apm_info.allow_ints = !invert;
- if ((strncmp(str, "broken-psr", 10) == 0) ||
- (strncmp(str, "broken_psr", 10) == 0))
- apm_info.get_power_status_broken = !invert;
- if ((strncmp(str, "realmode-power-off", 18) == 0) ||
- (strncmp(str, "realmode_power_off", 18) == 0))
- apm_info.realmode_power_off = !invert;
- str = strchr(str, ',');
- if (str != NULL)
- str += strspn(str, ", t");
- }
- return 1;
- }
- __setup("apm=", apm_setup);
- #endif
- static struct file_operations apm_bios_fops = {
- owner: THIS_MODULE,
- read: do_read,
- poll: do_poll,
- ioctl: do_ioctl,
- open: do_open,
- release: do_release,
- };
- static struct miscdevice apm_device = {
- APM_MINOR_DEV,
- "apm_bios",
- &apm_bios_fops
- };
- /*
- * Just start the APM thread. We do NOT want to do APM BIOS
- * calls from anything but the APM thread, if for no other reason
- * than the fact that we don't trust the APM BIOS. This way,
- * most common APM BIOS problems that lead to protection errors
- * etc will have at least some level of being contained...
- *
- * In short, if something bad happens, at least we have a choice
- * of just killing the apm thread..
- */
- static int __init apm_init(void)
- {
- struct proc_dir_entry *apm_proc;
- if (apm_info.bios.version == 0) {
- printk(KERN_INFO "apm: BIOS not found.n");
- return -ENODEV;
- }
- printk(KERN_INFO
- "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)n",
- ((apm_info.bios.version >> 8) & 0xff),
- (apm_info.bios.version & 0xff),
- apm_info.bios.flags,
- driver_version);
- if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
- printk(KERN_INFO "apm: no 32 bit BIOS supportn");
- return -ENODEV;
- }
- if (allow_ints)
- apm_info.allow_ints = 1;
- if (broken_psr)
- apm_info.get_power_status_broken = 1;
- if (realmode_power_off)
- apm_info.realmode_power_off = 1;
- /* User can override, but default is to trust DMI */
- if (apm_disabled != -1)
- apm_info.disabled = apm_disabled;
- /*
- * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
- * but is reportedly a 1.0 BIOS.
- */
- if (apm_info.bios.version == 0x001)
- apm_info.bios.version = 0x100;
- /* BIOS < 1.2 doesn't set cseg_16_len */
- if (apm_info.bios.version < 0x102)
- apm_info.bios.cseg_16_len = 0; /* 64k */
- if (debug) {
- printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
- apm_info.bios.cseg, apm_info.bios.offset,
- apm_info.bios.cseg_16, apm_info.bios.dseg);
- if (apm_info.bios.version > 0x100)
- printk(" cseg len %x, dseg len %x",
- apm_info.bios.cseg_len,
- apm_info.bios.dseg_len);
- if (apm_info.bios.version > 0x101)
- printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
- printk("n");
- }
- if (apm_info.disabled) {
- printk(KERN_NOTICE "apm: disabled on user request.n");
- return -ENODEV;
- }
- if ((smp_num_cpus > 1) && !power_off) {
- printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.n");
- return -ENODEV;
- }
- if (PM_IS_ACTIVE()) {
- printk(KERN_NOTICE "apm: overridden by ACPI.n");
- return -ENODEV;
- }
- pm_active = 1;
- /*
- * Set up a segment that references the real mode segment 0x40
- * that extends up to the end of page zero (that we have reserved).
- * This is for buggy BIOS's that refer to (real mode) segment 0x40
- * even though they are called in protected mode.
- */
- set_base(gdt[APM_40 >> 3],
- __va((unsigned long)0x40 << 4));
- _set_limit((char *)&gdt[APM_40 >> 3], 4095 - (0x40 << 4));
- apm_bios_entry.offset = apm_info.bios.offset;
- apm_bios_entry.segment = APM_CS;
- set_base(gdt[APM_CS >> 3],
- __va((unsigned long)apm_info.bios.cseg << 4));
- set_base(gdt[APM_CS_16 >> 3],
- __va((unsigned long)apm_info.bios.cseg_16 << 4));
- set_base(gdt[APM_DS >> 3],
- __va((unsigned long)apm_info.bios.dseg << 4));
- #ifndef APM_RELAX_SEGMENTS
- if (apm_info.bios.version == 0x100) {
- #endif
- /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
- _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
- /* For some unknown machine. */
- _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
- /* For the DEC Hinote Ultra CT475 (and others?) */
- _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
- #ifndef APM_RELAX_SEGMENTS
- } else {
- _set_limit((char *)&gdt[APM_CS >> 3],
- (apm_info.bios.cseg_len - 1) & 0xffff);
- _set_limit((char *)&gdt[APM_CS_16 >> 3],
- (apm_info.bios.cseg_16_len - 1) & 0xffff);
- _set_limit((char *)&gdt[APM_DS >> 3],
- (apm_info.bios.dseg_len - 1) & 0xffff);
- }
- #endif
- apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
- if (apm_proc)
- SET_MODULE_OWNER(apm_proc);
- kernel_thread(apm, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD);
- if (smp_num_cpus > 1) {
- printk(KERN_NOTICE
- "apm: disabled - APM is not SMP safe (power off active).n");
- return 0;
- }
- misc_register(&apm_device);
- if (HZ != 100)
- idle_period = (idle_period * HZ) / 100;
- if (idle_threshold < 100) {
- original_pm_idle = pm_idle;
- pm_idle = apm_cpu_idle;
- set_pm_idle = 1;
- }
- return 0;
- }
- static void __exit apm_exit(void)
- {
- int error;
- if (set_pm_idle)
- pm_idle = original_pm_idle;
- if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
- && (apm_info.connection_version > 0x0100)) {
- error = apm_engage_power_management(APM_DEVICE_ALL, 0);
- if (error)
- apm_error("disengage power management", error);
- }
- misc_deregister(&apm_device);
- remove_proc_entry("apm", NULL);
- unregister_sysrq_key('o',&sysrq_poweroff_op);
- if (power_off)
- pm_power_off = NULL;
- exit_kapmd = 1;
- while (kapmd_running)
- schedule();
- pm_active = 0;
- }
- module_init(apm_init);
- module_exit(apm_exit);
- MODULE_AUTHOR("Stephen Rothwell");
- MODULE_DESCRIPTION("Advanced Power Management");
- MODULE_LICENSE("GPL");
- MODULE_PARM(debug, "i");
- MODULE_PARM_DESC(debug, "Enable debug mode");
- MODULE_PARM(power_off, "i");
- MODULE_PARM_DESC(power_off, "Enable power off");
- MODULE_PARM(bounce_interval, "i");
- MODULE_PARM_DESC(bounce_interval,
- "Set the number of ticks to ignore suspend bounces");
- MODULE_PARM(allow_ints, "i");
- MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls");
- MODULE_PARM(broken_psr, "i");
- MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
- MODULE_PARM(realmode_power_off, "i");
- MODULE_PARM_DESC(realmode_power_off,
- "Switch to real mode before powering off");
- MODULE_PARM(idle_threshold, "i");
- MODULE_PARM_DESC(idle_threshold,
- "System idle percentage above which to make APM BIOS idle calls");
- MODULE_PARM(idle_period, "i");
- MODULE_PARM_DESC(idle_period,
- "Period (in sec/100) over which to caculate the idle percentage");
- EXPORT_NO_SYMBOLS;