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Diffstat (limited to 'arch/i386/kernel/apm.c')
| -rw-r--r-- | arch/i386/kernel/apm.c | 2403 |
1 files changed, 0 insertions, 2403 deletions
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c deleted file mode 100644 index f02a8aca826..00000000000 --- a/arch/i386/kernel/apm.c +++ /dev/null @@ -1,2403 +0,0 @@ -/* -*- 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 - * Oct 2002, Version 1.16ac - * - * 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) - * 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) - * 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). - * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we - * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. - * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. - * - * 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/whdc/archive/amp_12.mspx] - */ - -#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/seq_file.h> -#include <linux/miscdevice.h> -#include <linux/apm_bios.h> -#include <linux/init.h> -#include <linux/time.h> -#include <linux/sched.h> -#include <linux/pm.h> -#include <linux/pm_legacy.h> -#include <linux/capability.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/freezer.h> -#include <linux/smp.h> -#include <linux/dmi.h> -#include <linux/suspend.h> -#include <linux/kthread.h> - -#include <asm/system.h> -#include <asm/uaccess.h> -#include <asm/desc.h> -#include <asm/i8253.h> -#include <asm/paravirt.h> -#include <asm/reboot.h> - -#include "io_ports.h" - -#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 - * [no-]smp Use apm even on an SMP box - * 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 - -#include "apm.h" - -/* - * 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) - -/* - * Maximum number of events stored - */ -#define APM_MAX_EVENTS 20 - -/* - * The per-file APM data - */ -struct apm_user { - int magic; - struct apm_user * next; - unsigned int suser: 1; - unsigned int writer: 1; - unsigned int reader: 1; - unsigned 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 __read_mostly = DEFAULT_IDLE_THRESHOLD; -static int idle_period __read_mostly = 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 __read_mostly = DEFAULT_BOUNCE_INTERVAL; - -static int debug __read_mostly; -static int smp __read_mostly; -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 -#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 DEFINE_SPINLOCK(user_list_lock); -static const struct desc_struct bad_bios_desc = { 0, 0x00409200 }; - -static const char driver_version[] = "1.16ac"; /* no spaces */ - -static struct task_struct *kapmd_task; - -/* - * 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 const char * const 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 ARRAY_SIZE(apm_event_name) - -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 ARRAY_SIZE(error_table) - -/** - * 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: %s\n", str, error_table[i].msg); - else - printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n", - str, err); -} - -/* - * Lock APM functionality to physical CPU 0 - */ - -#ifdef CONFIG_SMP - -static cpumask_t apm_save_cpus(void) -{ - cpumask_t x = current->cpus_allowed; - /* Some bioses don't like being called from CPU != 0 */ - set_cpus_allowed(current, cpumask_of_cpu(0)); - BUG_ON(smp_processor_id() != 0); - return x; -} - -static inline void apm_restore_cpus(cpumask_t mask) -{ - set_cpus_allowed(current, mask); -} - -#else - -/* - * No CPU lockdown needed on a uniprocessor - */ - -#define apm_save_cpus() (current->cpus_allowed) -#define apm_restore_cpus(x) (void)(x) - -#endif - -/* - * 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. - */ - -static inline unsigned long __apm_irq_save(void) -{ - unsigned long flags; - local_save_flags(flags); - if (apm_info.allow_ints) { - if (irqs_disabled_flags(flags)) - local_irq_enable(); - } else - local_irq_disable(); - - return flags; -} - -#define apm_irq_save(flags) \ - do { flags = __apm_irq_save(); } while (0) - -static inline void apm_irq_restore(unsigned long flags) -{ - if (irqs_disabled_flags(flags)) - local_irq_disable(); - else if (irqs_disabled()) - local_irq_enable(); -} - -#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_RESTORE_SEGS \ - loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) -#else -# define APM_DECL_SEGS -# define APM_DO_SAVE_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; - cpumask_t cpus; - int cpu; - struct desc_struct save_desc_40; - struct desc_struct *gdt; - - cpus = apm_save_cpus(); - - cpu = get_cpu(); - gdt = get_cpu_gdt_table(cpu); - save_desc_40 = gdt[0x40 / 8]; - gdt[0x40 / 8] = bad_bios_desc; - - apm_irq_save(flags); - APM_DO_SAVE_SEGS; - apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi); - APM_DO_RESTORE_SEGS; - apm_irq_restore(flags); - gdt[0x40 / 8] = save_desc_40; - put_cpu(); - apm_restore_cpus(cpus); - - 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 returns one value only, 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; - cpumask_t cpus; - int cpu; - struct desc_struct save_desc_40; - struct desc_struct *gdt; - - cpus = apm_save_cpus(); - - cpu = get_cpu(); - gdt = get_cpu_gdt_table(cpu); - save_desc_40 = gdt[0x40 / 8]; - gdt[0x40 / 8] = bad_bios_desc; - - apm_irq_save(flags); - APM_DO_SAVE_SEGS; - error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax); - APM_DO_RESTORE_SEGS; - apm_irq_restore(flags); - gdt[0x40 / 8] = save_desc_40; - put_cpu(); - apm_restore_cpus(cpus); - 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 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; - u8 ret = 0; - int idled = 0; - int polling; - - polling = !!(current_thread_info()->status & TS_POLLING); - if (polling) { - current_thread_info()->status &= ~TS_POLLING; - /* - * TS_POLLING-cleared state must be visible before we - * test NEED_RESCHED: - */ - smp_mb(); - } - if (!need_resched()) { - idled = 1; - ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax); - } - if (polling) - current_thread_info()->status |= TS_POLLING; - - if (!idled) - return 0; - - if (ret) { - static unsigned long t; - - /* This always fails on some SMP boards running UP kernels. - * Only report the failure the first 5 times. - */ - if (++t < 5) - { - 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) __read_mostly; - -/** - * 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->stime; - } else if (jiffies_since_last_check > idle_period) { - unsigned int idle_percentage; - - idle_percentage = current->stime - last_stime; - idle_percentage *= 100; - idle_percentage /= jiffies_since_last_check; - use_apm_idle = (idle_percentage > idle_threshold); - if (apm_info.forbid_idle) - use_apm_idle = 0; - last_jiffies = jiffies; - last_stime = current->stime; - } - - bucket = IDLE_LEAKY_MAX; - - while (!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 */ - }; - - /* Some bioses don't like being called from CPU != 0 */ - if (apm_info.realmode_power_off) - { - (void)apm_save_cpus(); - machine_real_restart(po_bios_call, sizeof(po_bios_call)); - } - else - (void) set_system_power_state(APM_STATE_OFF); -} - -#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 don't 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 = APM_NOT_ENGAGED; /* silence gcc */ - int i; - u_short state; - static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; - - state = blank ? APM_STATE_STANDBY : APM_STATE_READY; - - for (i = 0; i < ARRAY_SIZE(dev); i++) { - error = set_power_state(dev[i], state); - - if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) - return 1; - - if (error == APM_NOT_ENGAGED) - break; - } - - if (error == APM_NOT_ENGAGED) { - static int tried; - int eng_error; - if (tried++ == 0) { - eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); - if (eng_error) { - apm_error("set display", error); - apm_error("engage interface", eng_error); - return 0; - } else - return apm_console_blank(blank); - } - } - 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) -{ - if (++as->event_tail >= APM_MAX_EVENTS) - as->event_tail = 0; - return as->events[as->event_tail]; -} - -static void queue_event(apm_event_t event, struct apm_user *sender) -{ - struct apm_user * as; - - spin_lock(&user_list_lock); - if (user_list == NULL) - goto out; - for (as = user_list; as != NULL; as = as->next) { - if ((as == sender) || (!as->reader)) - continue; - if (++as->event_head >= APM_MAX_EVENTS) - as->event_head = 0; - - if (as->event_head == as->event_tail) { - static int notified; - - if (notified++ == 0) - printk(KERN_ERR "apm: an event queue overflowed\n"); - if (++as->event_tail >= APM_MAX_EVENTS) - as->event_tail = 0; - } - 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); -out: - spin_unlock(&user_list_lock); -} - -static void reinit_timer(void) -{ -#ifdef INIT_TIMER_AFTER_SUSPEND - unsigned long flags; - - spin_lock_irqsave(&i8253_lock, flags); - /* set the clock to HZ */ - outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ - udelay(10); - outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ - udelay(10); - outb(LATCH >> 8, PIT_CH0); /* MSB */ - udelay(10); - spin_unlock_irqrestore(&i8253_lock, 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"); - } - - device_suspend(PMSG_SUSPEND); - local_irq_disable(); - device_power_down(PMSG_SUSPEND); - - local_irq_enable(); - - save_processor_state(); - err = set_system_power_state(APM_STATE_SUSPEND); - ignore_normal_resume = 1; - restore_processor_state(); - - local_irq_disable(); - reinit_timer(); - - if (err == APM_NO_ERROR) - err = APM_SUCCESS; - if (err != APM_SUCCESS) - apm_error("suspend", err); - err = (err == APM_SUCCESS) ? 0 : -EIO; - device_power_up(); - local_irq_enable(); - device_resume(); - pm_send_all(PM_RESUME, (void *)0); - queue_event(APM_NORMAL_RESUME, NULL); - out: - spin_lock(&user_list_lock); - for (as = user_list; as != NULL; as = as->next) { - as->suspend_wait = 0; - as->suspend_result = err; - } - spin_unlock(&user_list_lock); - wake_up_interruptible(&apm_suspend_waitqueue); - return err; -} - -static void standby(void) -{ - int err; - - local_irq_disable(); - device_power_down(PMSG_SUSPEND); - local_irq_enable(); - - err = set_system_power_state(APM_STATE_STANDBY); - if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) - apm_error("standby", err); - - local_irq_disable(); - device_power_up(); - local_irq_enable(); -} - -static apm_event_t get_event(void) -{ - int error; - apm_event_t event = APM_NO_EVENTS; /* silence gcc */ - 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 notify\n", - apm_event_name[event - 1]); - else - printk(KERN_DEBUG "apm: received unknown " - "event 0x%02x\n", 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)) { - device_resume(); - 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: - 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 busy\n"); - 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 (kthread_should_stop()) - 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 filp\n", func); - return 1; - } - return 0; -} - -static ssize_t do_read(struct file *fp, char __user *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 ((int)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; - 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); - } - spin_lock(&user_list_lock); - 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 list\n"); - else - as1->next = as->next; - } - spin_unlock(&user_list_lock); - kfree(as); - return 0; -} - -static int do_open(struct inode * inode, struct file * filp) -{ - struct apm_user * as; - - as = kmalloc(sizeof(*as), GFP_KERNEL); - if (as == NULL) { - printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", - 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; - spin_lock(&user_list_lock); - as->next = user_list; - user_list = as; - spin_unlock(&user_list_lock); - filp->private_data = as; - return 0; -} - -static int proc_apm_show(struct seq_file *m, void *v) -{ - 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 = "?"; - - if ((num_online_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 */ - - seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", - 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 0; -} - -static int proc_apm_open(struct inode *inode, struct file *file) -{ - return single_open(file, proc_apm_show, NULL); -} - -static const struct file_operations apm_file_ops = { - .owner = THIS_MODULE, - .open = proc_apm_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int apm(void *unused) -{ - unsigned short bx; - unsigned short cx; - unsigned short dx; - int error; - char * power_stat; - char * bat_stat; - -#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. - */ - set_cpus_allowed(current, cpumask_of_cpu(0)); - BUG_ON(smp_processor_id() != 0); -#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.%d\n", - (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 && (num_online_cpus() == 1 || smp )) { - error = apm_get_power_status(&bx, &cx, &dx); - if (error) - printk(KERN_INFO "apm: power status not available\n"); - 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("unknown\n"); - 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("unknown\n"); - else - printk("%d %s\n", dx & 0x7fff, - (dx & 0x8000) ? - "minutes" : "seconds"); - } - } - } - - /* Install our power off handler.. */ - if (power_off) - pm_power_off = apm_power_off; - - if (num_online_cpus() == 1 || smp) { -#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 - } - - return 0; -} - -#ifndef MODULE -static int __init apm_setup(char *str) -{ - int invert; - - while ((str != NULL) && (*str != '\0')) { - 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, "smp", 3) == 0) - { - smp = !invert; - idle_threshold = 100; - } - 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 const 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 -}; - - -/* Simple "print if true" callback */ -static int __init print_if_true(struct dmi_system_id *d) -{ - printk("%s\n", d->ident); - return 0; -} - -/* - * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was - * disabled before the suspend. Linux used to get terribly confused by that. - */ -static int __init broken_ps2_resume(struct dmi_system_id *d) -{ - printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident); - return 0; -} - -/* Some bioses have a broken protected mode poweroff and need to use realmode */ -static int __init set_realmode_power_off(struct dmi_system_id *d) -{ - if (apm_info.realmode_power_off == 0) { - apm_info.realmode_power_off = 1; - printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident); - } - return 0; -} - -/* Some laptops require interrupts to be enabled during APM calls */ -static int __init set_apm_ints(struct dmi_system_id *d) -{ - if (apm_info.allow_ints == 0) { - apm_info.allow_ints = 1; - printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident); - } - return 0; -} - -/* Some APM bioses corrupt memory or just plain do not work */ -static int __init apm_is_horked(struct dmi_system_id *d) -{ - if (apm_info.disabled == 0) { - apm_info.disabled = 1; - printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident); - } - return 0; -} - -static int __init apm_is_horked_d850md(struct dmi_system_id *d) -{ - if (apm_info.disabled == 0) { - apm_info.disabled = 1; - printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident); - printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n"); - printk(KERN_INFO "download from support.intel.com \n"); - } - return 0; -} - -/* Some APM bioses hang on APM idle calls */ -static int __init apm_likes_to_melt(struct dmi_system_id *d) -{ - if (apm_info.forbid_idle == 0) { - apm_info.forbid_idle = 1; - printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident); - } - return 0; -} - -/* - * Check for clue free BIOS implementations who use - * the following QA technique - * - * [ Write BIOS Code ]<------ - * | ^ - * < Does it Compile >----N-- - * |Y ^ - * < Does it Boot Win98 >-N-- - * |Y - * [Ship It] - * - * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) - * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) - */ -static int __init broken_apm_power(struct dmi_system_id *d) -{ - apm_info.get_power_status_broken = 1; - printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n"); - return 0; -} - -/* - * This bios swaps the APM minute reporting bytes over (Many sony laptops - * have this problem). - */ -static int __init swab_apm_power_in_minutes(struct dmi_system_id *d) -{ - apm_info.get_power_status_swabinminutes = 1; - printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n"); - return 0; -} - -static struct dmi_system_id __initdata apm_dmi_table[] = { - { - print_if_true, - KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", - { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), - DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, - }, - { /* Handle problems with APM on the C600 */ - broken_ps2_resume, "Dell Latitude C600", - { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), - DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, - }, - { /* Allow interrupts during suspend on Dell Latitude laptops*/ - set_apm_ints, "Dell Latitude", - { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), - DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } - }, - { /* APM crashes */ - apm_is_horked, "Dell Inspiron 2500", - { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), - DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), - DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, - }, - { /* Allow interrupts during suspend on Dell Inspiron laptops*/ - set_apm_ints, "Dell Inspiron", { - DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), - DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, - }, - { /* Handle problems with APM on Inspiron 5000e */ - broken_apm_power, "Dell Inspiron 5000e", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "A04"), - DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, - }, - { /* Handle problems with APM on Inspiron 2500 */ - broken_apm_power, "Dell Inspiron 2500", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "A12"), - DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, - }, - { /* APM crashes */ - apm_is_horked, "Dell Dimension 4100", - { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), - DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), - DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."), - DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, - }, - { /* Allow interrupts during suspend on Compaq Laptops*/ - set_apm_ints, "Compaq 12XL125", - { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), - DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), - DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION,"4.06"), }, - }, - { /* Allow interrupts during APM or the clock goes slow */ - set_apm_ints, "ASUSTeK", - { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), - DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, - }, - { /* APM blows on shutdown */ - apm_is_horked, "ABIT KX7-333[R]", - { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), - DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, - }, - { /* APM crashes */ - apm_is_horked, "Trigem Delhi3", - { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), - DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, - }, - { /* APM crashes */ - apm_is_horked, "Fujitsu-Siemens", - { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), - DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, - }, - { /* APM crashes */ - apm_is_horked_d850md, "Intel D850MD", - { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), - DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, - }, - { /* APM crashes */ - apm_is_horked, "Intel D810EMO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), - DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, - }, - { /* APM crashes */ - apm_is_horked, "Dell XPS-Z", - { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), - DMI_MATCH(DMI_BIOS_VERSION, "A11"), - DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, - }, - { /* APM crashes */ - apm_is_horked, "Sharp PC-PJ/AX", - { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), - DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), - DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"), - DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), }, - }, - { /* APM crashes */ - apm_is_horked, "Dell Inspiron 2500", - { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), - DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), - DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, - }, - { /* APM idle hangs */ - apm_likes_to_melt, "Jabil AMD", - { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), - DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, - }, - { /* APM idle hangs */ - apm_likes_to_melt, "AMI Bios", - { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), - DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), - DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-N505VX */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), - DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-XG29 */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), - DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), - DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), - DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), - DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), - DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), - DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), - DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-F104K */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), - DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, - }, - - { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), - DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-C1VE */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), - DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, - }, - { /* Handle problems with APM on Sony Vaio PCG-C1VE */ - swab_apm_power_in_minutes, "Sony VAIO", - { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), - DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), - DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, - }, - { /* broken PM poweroff bios */ - set_realmode_power_off, "Award Software v4.60 PGMA", - { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), - DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), - DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, - }, - - /* Generic per vendor APM settings */ - - { /* Allow interrupts during suspend on IBM laptops */ - set_apm_ints, "IBM", - { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, - }, - - { } -}; - -/* - * 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; - struct desc_struct *gdt; - int err; - - dmi_check_system(apm_dmi_table); - - if (apm_info.bios.version == 0 || paravirt_enabled()) { - 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 support\n"); - 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:%x 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 ((num_online_cpus() > 1) && !power_off && !smp) { - printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n"); - apm_info.disabled = 1; - return -ENODEV; - } - if (PM_IS_ACTIVE()) { - printk(KERN_NOTICE "apm: overridden by ACPI.\n"); - apm_info.disabled = 1; - return -ENODEV; - } -#ifdef CONFIG_PM_LEGACY - pm_active = 1; -#endif - - /* - * 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(bad_bios_desc, __va((unsigned long)0x40 << 4)); - _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); - - /* - * Set up the long jump entry point to the APM BIOS, which is called - * from inline assembly. - */ - apm_bios_entry.offset = apm_info.bios.offset; - apm_bios_entry.segment = APM_CS; - - /* - * 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. - * - * Note we only set APM segments on CPU zero, since we pin the APM - * code to that CPU. - */ - gdt = get_cpu_gdt_table(0); - 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)); - - apm_proc = create_proc_entry("apm", 0, NULL); - if (apm_proc) - apm_proc->proc_fops = &apm_file_ops; - - kapmd_task = kthread_create(apm, NULL, "kapmd"); - if (IS_ERR(kapmd_task)) { - printk(KERN_ERR "apm: disabled - Unable to start kernel " - "thread.\n"); - err = PTR_ERR(kapmd_task); - kapmd_task = NULL; - remove_proc_entry("apm", NULL); - return err; - } - wake_up_process(kapmd_task); - - if (num_online_cpus() > 1 && !smp ) { - printk(KERN_NOTICE - "apm: disabled - APM is not SMP safe (power off active).\n"); - return 0; - } - - /* - * Note we don't actually care if the misc_device cannot be registered. - * this driver can do its job without it, even if userspace can't - * control it. just log the error - */ - if (misc_register(&apm_device)) - printk(KERN_WARNING "apm: Could not register misc device.\n"); - - 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; - /* - * We are about to unload the current idle thread pm callback - * (pm_idle), Wait for all processors to update cached/local - * copies of pm_idle before proceeding. - */ - cpu_idle_wait(); - } - 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); - if (power_off) - pm_power_off = NULL; - if (kapmd_task) { - kthread_stop(kapmd_task); - kapmd_task = NULL; - } -#ifdef CONFIG_PM_LEGACY - pm_active = 0; -#endif -} - -module_init(apm_init); -module_exit(apm_exit); - -MODULE_AUTHOR("Stephen Rothwell"); -MODULE_DESCRIPTION("Advanced Power Management"); -MODULE_LICENSE("GPL"); -module_param(debug, bool, 0644); -MODULE_PARM_DESC(debug, "Enable debug mode"); -module_param(power_off, bool, 0444); -MODULE_PARM_DESC(power_off, "Enable power off"); -module_param(bounce_interval, int, 0444); -MODULE_PARM_DESC(bounce_interval, - "Set the number of ticks to ignore suspend bounces"); -module_param(allow_ints, bool, 0444); -MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); -module_param(broken_psr, bool, 0444); -MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); -module_param(realmode_power_off, bool, 0444); -MODULE_PARM_DESC(realmode_power_off, - "Switch to real mode before powering off"); -module_param(idle_threshold, int, 0444); -MODULE_PARM_DESC(idle_threshold, - "System idle percentage above which to make APM BIOS idle calls"); -module_param(idle_period, int, 0444); -MODULE_PARM_DESC(idle_period, - "Period (in sec/100) over which to caculate the idle percentage"); -module_param(smp, bool, 0444); -MODULE_PARM_DESC(smp, - "Set this to enable APM use on an SMP platform. Use with caution on older systems"); -MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); |