1/* -*- linux-c -*- 2 * APM BIOS driver for Linux 3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au) 4 * 5 * Initial development of this driver was funded by NEC Australia P/L 6 * and NEC Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2, or (at your option) any 11 * later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * October 1995, Rik Faith (faith@cs.unc.edu): 19 * Minor enhancements and updates (to the patch set) for 1.3.x 20 * Documentation 21 * January 1996, Rik Faith (faith@cs.unc.edu): 22 * Make /proc/apm easy to format (bump driver version) 23 * March 1996, Rik Faith (faith@cs.unc.edu): 24 * Prohibit APM BIOS calls unless apm_enabled. 25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>) 26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au) 27 * Version 1.0 and 1.1 28 * May 1996, Version 1.2 29 * Feb 1998, Version 1.3 30 * Feb 1998, Version 1.4 31 * Aug 1998, Version 1.5 32 * Sep 1998, Version 1.6 33 * Nov 1998, Version 1.7 34 * Jan 1999, Version 1.8 35 * Jan 1999, Version 1.9 36 * Oct 1999, Version 1.10 37 * Nov 1999, Version 1.11 38 * Jan 2000, Version 1.12 39 * Feb 2000, Version 1.13 40 * Nov 2000, Version 1.14 41 * Oct 2001, Version 1.15 42 * Jan 2002, Version 1.16 43 * Oct 2002, Version 1.16ac 44 * 45 * History: 46 * 0.6b: first version in official kernel, Linux 1.3.46 47 * 0.7: changed /proc/apm format, Linux 1.3.58 48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59 49 * 0.9: only call bios if bios is present, Linux 1.3.72 50 * 1.0: use fixed device number, consolidate /proc/apm into this file, 51 * Linux 1.3.85 52 * 1.1: support user-space standby and suspend, power off after system 53 * halted, Linux 1.3.98 54 * 1.2: When resetting RTC after resume, take care so that the time 55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth 56 * <jtoth@princeton.edu>); improve interaction between 57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4 58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added 59 * levels to the printk calls. APM is not defined for SMP machines. 60 * The new replacement for it is, but Linux doesn't yet support this. 61 * Alan Cox Linux 2.1.55 62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's 63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by 64 * Dean Gaudet <dgaudet@arctic.org>. 65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87 66 * 1.5: Fix segment register reloading (in case of bad segments saved 67 * across BIOS call). 68 * Stephen Rothwell 69 * 1.6: Cope with compiler/assembler differences. 70 * Only try to turn off the first display device. 71 * Fix OOPS at power off with no APM BIOS by Jan Echternach 72 * <echter@informatik.uni-rostock.de> 73 * Stephen Rothwell 74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags 75 * to reflect current state of APM BIOS. 76 * Chris Rankin <rankinc@bellsouth.net> 77 * Reset interrupt 0 timer to 100Hz after suspend 78 * Chad Miller <cmiller@surfsouth.com> 79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE 80 * Richard Gooch <rgooch@atnf.csiro.au> 81 * Allow boot time disabling of APM 82 * Make boot messages far less verbose by default 83 * Make asm safer 84 * Stephen Rothwell 85 * 1.8: Add CONFIG_APM_RTC_IS_GMT 86 * Richard Gooch <rgooch@atnf.csiro.au> 87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS 88 * remove dependency on CONFIG_PROC_FS 89 * Stephen Rothwell 90 * 1.9: Fix small typo. <laslo@wodip.opole.pl> 91 * Try to cope with BIOS's that need to have all display 92 * devices blanked and not just the first one. 93 * Ross Paterson <ross@soi.city.ac.uk> 94 * Fix segment limit setting it has always been wrong as 95 * the segments needed to have byte granularity. 96 * Mark a few things __init. 97 * Add hack to allow power off of SMP systems by popular request. 98 * Use CONFIG_SMP instead of __SMP__ 99 * Ignore BOUNCES for three seconds. 100 * Stephen Rothwell 101 * 1.10: Fix for Thinkpad return code. 102 * Merge 2.2 and 2.3 drivers. 103 * Remove APM dependencies in arch/i386/kernel/process.c 104 * Remove APM dependencies in drivers/char/sysrq.c 105 * Reset time across standby. 106 * Allow more inititialisation on SMP. 107 * Remove CONFIG_APM_POWER_OFF and make it boot time 108 * configurable (default on). 109 * Make debug only a boot time parameter (remove APM_DEBUG). 110 * Try to blank all devices on any error. 111 * 1.11: Remove APM dependencies in drivers/char/console.c 112 * Check nr_running to detect if we are idle (from 113 * Borislav Deianov <borislav@lix.polytechnique.fr>) 114 * Fix for bioses that don't zero the top part of the 115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>) 116 * (reported by Panos Katsaloulis <teras@writeme.com>). 117 * Real mode power off patch (Walter Hofmann 118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>). 119 * 1.12: Remove CONFIG_SMP as the compiler will optimize 120 * the code away anyway (smp_num_cpus == 1 in UP) 121 * noted by Artur Skawina <skawina@geocities.com>. 122 * Make power off under SMP work again. 123 * Fix thinko with initial engaging of BIOS. 124 * Make sure power off only happens on CPU 0 125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>). 126 * Do error notification to user mode if BIOS calls fail. 127 * Move entrypoint offset fix to ...boot/setup.S 128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>). 129 * Remove smp-power-off. SMP users must now specify 130 * "apm=power-off" on the kernel command line. Suggested 131 * by Jim Avera <jima@hal.com>, modified by Alan Cox 132 * <alan@lxorguk.ukuu.org.uk>. 133 * Register the /proc/apm entry even on SMP so that 134 * scripts that check for it before doing power off 135 * work (Jim Avera <jima@hal.com>). 136 * 1.13: Changes for new pm_ interfaces (Andy Henroid 137 * <andy_henroid@yahoo.com>). 138 * Modularize the code. 139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS 140 * is now the way life works). 141 * Fix thinko in suspend() (wrong return). 142 * Notify drivers on critical suspend. 143 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz> 144 * modified by sfr). 145 * Disable interrupts while we are suspended (Andy Henroid 146 * <andy_henroid@yahoo.com> fixed by sfr). 147 * Make power off work on SMP again (Tony Hoyle 148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr. 149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore 150 * interval is now configurable. 151 * 1.14: Make connection version persist across module unload/load. 152 * Enable and engage power management earlier. 153 * Disengage power management on module unload. 154 * Changed to use the sysrq-register hack for registering the 155 * power off function called by magic sysrq based upon discussions 156 * in irc://irc.openprojects.net/#kernelnewbies 157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>). 158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable. 159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr. 160 * Work around byte swap bug in one of the Vaio's BIOS's 161 * (Marc Boucher <marc@mbsi.ca>). 162 * Exposed the disable flag to dmi so that we can handle known 163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). 164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin 165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) 166 * If an APM idle fails log it and idle sensibly 167 * 1.15: Don't queue events to clients who open the device O_WRONLY. 168 * Don't expect replies from clients who open the device O_RDONLY. 169 * (Idea from Thomas Hood) 170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>) 171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.) 172 * Notify listeners of standby or suspend events before notifying 173 * drivers. Return EBUSY to ioctl() if suspend is rejected. 174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood) 175 * Ignore first resume after we generate our own resume event 176 * after a suspend (Thomas Hood) 177 * Daemonize now gets rid of our controlling terminal (sfr). 178 * CONFIG_APM_CPU_IDLE now just affects the default value of 179 * idle_threshold (sfr). 180 * Change name of kernel apm daemon (as it no longer idles) (sfr). 181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we 182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. 183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. 184 * 185 * APM 1.1 Reference: 186 * 187 * Intel Corporation, Microsoft Corporation. Advanced Power Management 188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993. 189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01. 190 * 191 * [This document is available free from Intel by calling 800.628.8686 (fax 192 * 916.356.6100) or 800.548.4725; or from 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also 194 * available from Microsoft by calling 206.882.8080.] 195 * 196 * APM 1.2 Reference: 197 * Intel Corporation, Microsoft Corporation. Advanced Power Management 198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996. 199 * 200 * [This document is available from Microsoft at: 201 * http://www.microsoft.com/whdc/archive/amp_12.mspx] 202 */ 203 204#define pr_fmt(fmt) "apm: " fmt 205 206#include <linux/module.h> 207 208#include <linux/poll.h> 209#include <linux/types.h> 210#include <linux/stddef.h> 211#include <linux/timer.h> 212#include <linux/fcntl.h> 213#include <linux/slab.h> 214#include <linux/stat.h> 215#include <linux/proc_fs.h> 216#include <linux/seq_file.h> 217#include <linux/miscdevice.h> 218#include <linux/apm_bios.h> 219#include <linux/init.h> 220#include <linux/time.h> 221#include <linux/sched.h> 222#include <linux/pm.h> 223#include <linux/capability.h> 224#include <linux/device.h> 225#include <linux/kernel.h> 226#include <linux/freezer.h> 227#include <linux/smp.h> 228#include <linux/dmi.h> 229#include <linux/suspend.h> 230#include <linux/kthread.h> 231#include <linux/jiffies.h> 232#include <linux/acpi.h> 233#include <linux/syscore_ops.h> 234#include <linux/i8253.h> 235#include <linux/cpuidle.h> 236 237#include <asm/uaccess.h> 238#include <asm/desc.h> 239#include <asm/olpc.h> 240#include <asm/paravirt.h> 241#include <asm/reboot.h> 242 243#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 244extern int (*console_blank_hook)(int); 245#endif 246 247/* 248 * The apm_bios device is one of the misc char devices. 249 * This is its minor number. 250 */ 251#define APM_MINOR_DEV 134 252 253/* 254 * Various options can be changed at boot time as follows: 255 * (We allow underscores for compatibility with the modules code) 256 * apm=on/off enable/disable APM 257 * [no-]allow[-_]ints allow interrupts during BIOS calls 258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call 259 * [no-]realmode[-_]power[-_]off switch to real mode before 260 * powering off 261 * [no-]debug log some debugging messages 262 * [no-]power[-_]off power off on shutdown 263 * [no-]smp Use apm even on an SMP box 264 * bounce[-_]interval=<n> number of ticks to ignore suspend 265 * bounces 266 * idle[-_]threshold=<n> System idle percentage above which to 267 * make APM BIOS idle calls. Set it to 268 * 100 to disable. 269 * idle[-_]period=<n> Period (in 1/100s of a second) over 270 * which the idle percentage is 271 * calculated. 272 */ 273 274/* KNOWN PROBLEM MACHINES: 275 * 276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant 277 * [Confirmed by TI representative] 278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification 279 * [Confirmed by BIOS disassembly] 280 * [This may work now ...] 281 * P: Toshiba 1950S: battery life information only gets updated after resume 282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking 283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] 284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP 285 * Neale Banks <neale@lowendale.com.au> December 2000 286 * 287 * Legend: U = unusable with APM patches 288 * P = partially usable with APM patches 289 */ 290 291/* 292 * Define as 1 to make the driver always call the APM BIOS busy 293 * routine even if the clock was not reported as slowed by the 294 * idle routine. Otherwise, define as 0. 295 */ 296#define ALWAYS_CALL_BUSY 1 297 298/* 299 * Define to make the APM BIOS calls zero all data segment registers (so 300 * that an incorrect BIOS implementation will cause a kernel panic if it 301 * tries to write to arbitrary memory). 302 */ 303#define APM_ZERO_SEGS 304 305#include <asm/apm.h> 306 307/* 308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. 309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by 310 * David Chen <chen@ctpa04.mit.edu> 311 */ 312#undef INIT_TIMER_AFTER_SUSPEND 313 314#ifdef INIT_TIMER_AFTER_SUSPEND 315#include <linux/timex.h> 316#include <asm/io.h> 317#include <linux/delay.h> 318#endif 319 320/* 321 * Need to poll the APM BIOS every second 322 */ 323#define APM_CHECK_TIMEOUT (HZ) 324 325/* 326 * Ignore suspend events for this amount of time after a resume 327 */ 328#define DEFAULT_BOUNCE_INTERVAL (3 * HZ) 329 330/* 331 * Maximum number of events stored 332 */ 333#define APM_MAX_EVENTS 20 334 335/* 336 * The per-file APM data 337 */ 338struct apm_user { 339 int magic; 340 struct apm_user *next; 341 unsigned int suser: 1; 342 unsigned int writer: 1; 343 unsigned int reader: 1; 344 unsigned int suspend_wait: 1; 345 int suspend_result; 346 int suspends_pending; 347 int standbys_pending; 348 int suspends_read; 349 int standbys_read; 350 int event_head; 351 int event_tail; 352 apm_event_t events[APM_MAX_EVENTS]; 353}; 354 355/* 356 * The magic number in apm_user 357 */ 358#define APM_BIOS_MAGIC 0x4101 359 360/* 361 * idle percentage above which bios idle calls are done 362 */ 363#ifdef CONFIG_APM_CPU_IDLE 364#define DEFAULT_IDLE_THRESHOLD 95 365#else 366#define DEFAULT_IDLE_THRESHOLD 100 367#endif 368#define DEFAULT_IDLE_PERIOD (100 / 3) 369 370static int apm_cpu_idle(struct cpuidle_device *dev, 371 struct cpuidle_driver *drv, int index); 372 373static struct cpuidle_driver apm_idle_driver = { 374 .name = "apm_idle", 375 .owner = THIS_MODULE, 376 .states = { 377 { /* entry 0 is for polling */ }, 378 { /* entry 1 is for APM idle */ 379 .name = "APM", 380 .desc = "APM idle", 381 .exit_latency = 250, /* WAG */ 382 .target_residency = 500, /* WAG */ 383 .enter = &apm_cpu_idle 384 }, 385 }, 386 .state_count = 2, 387}; 388 389static struct cpuidle_device apm_cpuidle_device; 390 391/* 392 * Local variables 393 */ 394__visible struct { 395 unsigned long offset; 396 unsigned short segment; 397} apm_bios_entry; 398static int clock_slowed; 399static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; 400static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; 401static int suspends_pending; 402static int standbys_pending; 403static int ignore_sys_suspend; 404static int ignore_normal_resume; 405static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; 406 407static bool debug __read_mostly; 408static bool smp __read_mostly; 409static int apm_disabled = -1; 410#ifdef CONFIG_SMP 411static bool power_off; 412#else 413static bool power_off = 1; 414#endif 415static bool realmode_power_off; 416#ifdef CONFIG_APM_ALLOW_INTS 417static bool allow_ints = 1; 418#else 419static bool allow_ints; 420#endif 421static bool broken_psr; 422 423static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); 424static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); 425static struct apm_user *user_list; 426static DEFINE_SPINLOCK(user_list_lock); 427static DEFINE_MUTEX(apm_mutex); 428 429/* 430 * Set up a segment that references the real mode segment 0x40 431 * that extends up to the end of page zero (that we have reserved). 432 * This is for buggy BIOS's that refer to (real mode) segment 0x40 433 * even though they are called in protected mode. 434 */ 435static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, 436 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); 437 438static const char driver_version[] = "1.16ac"; /* no spaces */ 439 440static struct task_struct *kapmd_task; 441 442/* 443 * APM event names taken from the APM 1.2 specification. These are 444 * the message codes that the BIOS uses to tell us about events 445 */ 446static const char * const apm_event_name[] = { 447 "system standby", 448 "system suspend", 449 "normal resume", 450 "critical resume", 451 "low battery", 452 "power status change", 453 "update time", 454 "critical suspend", 455 "user standby", 456 "user suspend", 457 "system standby resume", 458 "capabilities change" 459}; 460#define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) 461 462typedef struct lookup_t { 463 int key; 464 char *msg; 465} lookup_t; 466 467/* 468 * The BIOS returns a set of standard error codes in AX when the 469 * carry flag is set. 470 */ 471 472static const lookup_t error_table[] = { 473/* N/A { APM_SUCCESS, "Operation succeeded" }, */ 474 { APM_DISABLED, "Power management disabled" }, 475 { APM_CONNECTED, "Real mode interface already connected" }, 476 { APM_NOT_CONNECTED, "Interface not connected" }, 477 { APM_16_CONNECTED, "16 bit interface already connected" }, 478/* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ 479 { APM_32_CONNECTED, "32 bit interface already connected" }, 480 { APM_32_UNSUPPORTED, "32 bit interface not supported" }, 481 { APM_BAD_DEVICE, "Unrecognized device ID" }, 482 { APM_BAD_PARAM, "Parameter out of range" }, 483 { APM_NOT_ENGAGED, "Interface not engaged" }, 484 { APM_BAD_FUNCTION, "Function not supported" }, 485 { APM_RESUME_DISABLED, "Resume timer disabled" }, 486 { APM_BAD_STATE, "Unable to enter requested state" }, 487/* N/A { APM_NO_EVENTS, "No events pending" }, */ 488 { APM_NO_ERROR, "BIOS did not set a return code" }, 489 { APM_NOT_PRESENT, "No APM present" } 490}; 491#define ERROR_COUNT ARRAY_SIZE(error_table) 492 493/** 494 * apm_error - display an APM error 495 * @str: information string 496 * @err: APM BIOS return code 497 * 498 * Write a meaningful log entry to the kernel log in the event of 499 * an APM error. Note that this also handles (negative) kernel errors. 500 */ 501 502static void apm_error(char *str, int err) 503{ 504 int i; 505 506 for (i = 0; i < ERROR_COUNT; i++) 507 if (error_table[i].key == err) 508 break; 509 if (i < ERROR_COUNT) 510 pr_notice("%s: %s\n", str, error_table[i].msg); 511 else if (err < 0) 512 pr_notice("%s: linux error code %i\n", str, err); 513 else 514 pr_notice("%s: unknown error code %#2.2x\n", 515 str, err); 516} 517 518/* 519 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and 520 * apm_info.allow_ints, we are being really paranoid here! Not only 521 * are interrupts disabled, but all the segment registers (except SS) 522 * are saved and zeroed this means that if the BIOS tries to reference 523 * any data without explicitly loading the segment registers, the kernel 524 * will fault immediately rather than have some unforeseen circumstances 525 * for the rest of the kernel. And it will be very obvious! :-) Doing 526 * this depends on CS referring to the same physical memory as DS so that 527 * DS can be zeroed before the call. Unfortunately, we can't do anything 528 * about the stack segment/pointer. Also, we tell the compiler that 529 * everything could change. 530 * 531 * Also, we KNOW that for the non error case of apm_bios_call, there 532 * is no useful data returned in the low order 8 bits of eax. 533 */ 534 535static inline unsigned long __apm_irq_save(void) 536{ 537 unsigned long flags; 538 local_save_flags(flags); 539 if (apm_info.allow_ints) { 540 if (irqs_disabled_flags(flags)) 541 local_irq_enable(); 542 } else 543 local_irq_disable(); 544 545 return flags; 546} 547 548#define apm_irq_save(flags) \ 549 do { flags = __apm_irq_save(); } while (0) 550 551static inline void apm_irq_restore(unsigned long flags) 552{ 553 if (irqs_disabled_flags(flags)) 554 local_irq_disable(); 555 else if (irqs_disabled()) 556 local_irq_enable(); 557} 558 559#ifdef APM_ZERO_SEGS 560# define APM_DECL_SEGS \ 561 unsigned int saved_fs; unsigned int saved_gs; 562# define APM_DO_SAVE_SEGS \ 563 savesegment(fs, saved_fs); savesegment(gs, saved_gs) 564# define APM_DO_RESTORE_SEGS \ 565 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) 566#else 567# define APM_DECL_SEGS 568# define APM_DO_SAVE_SEGS 569# define APM_DO_RESTORE_SEGS 570#endif 571 572struct apm_bios_call { 573 u32 func; 574 /* In and out */ 575 u32 ebx; 576 u32 ecx; 577 /* Out only */ 578 u32 eax; 579 u32 edx; 580 u32 esi; 581 582 /* Error: -ENOMEM, or bits 8-15 of eax */ 583 int err; 584}; 585 586/** 587 * __apm_bios_call - Make an APM BIOS 32bit call 588 * @_call: pointer to struct apm_bios_call. 589 * 590 * Make an APM call using the 32bit protected mode interface. The 591 * caller is responsible for knowing if APM BIOS is configured and 592 * enabled. This call can disable interrupts for a long period of 593 * time on some laptops. The return value is in AH and the carry 594 * flag is loaded into AL. If there is an error, then the error 595 * code is returned in AH (bits 8-15 of eax) and this function 596 * returns non-zero. 597 * 598 * Note: this makes the call on the current CPU. 599 */ 600static long __apm_bios_call(void *_call) 601{ 602 APM_DECL_SEGS 603 unsigned long flags; 604 int cpu; 605 struct desc_struct save_desc_40; 606 struct desc_struct *gdt; 607 struct apm_bios_call *call = _call; 608 609 cpu = get_cpu(); 610 BUG_ON(cpu != 0); 611 gdt = get_cpu_gdt_table(cpu); 612 save_desc_40 = gdt[0x40 / 8]; 613 gdt[0x40 / 8] = bad_bios_desc; 614 615 apm_irq_save(flags); 616 APM_DO_SAVE_SEGS; 617 apm_bios_call_asm(call->func, call->ebx, call->ecx, 618 &call->eax, &call->ebx, &call->ecx, &call->edx, 619 &call->esi); 620 APM_DO_RESTORE_SEGS; 621 apm_irq_restore(flags); 622 gdt[0x40 / 8] = save_desc_40; 623 put_cpu(); 624 625 return call->eax & 0xff; 626} 627 628/* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ 629static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) 630{ 631 int ret; 632 633 /* Don't bother with work_on_cpu in the common case, so we don't 634 * have to worry about OOM or overhead. */ 635 if (get_cpu() == 0) { 636 ret = fn(call); 637 put_cpu(); 638 } else { 639 put_cpu(); 640 ret = work_on_cpu(0, fn, call); 641 } 642 643 /* work_on_cpu can fail with -ENOMEM */ 644 if (ret < 0) 645 call->err = ret; 646 else 647 call->err = (call->eax >> 8) & 0xff; 648 649 return ret; 650} 651 652/** 653 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) 654 * @call: the apm_bios_call registers. 655 * 656 * If there is an error, it is returned in @call.err. 657 */ 658static int apm_bios_call(struct apm_bios_call *call) 659{ 660 return on_cpu0(__apm_bios_call, call); 661} 662 663/** 664 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) 665 * @_call: pointer to struct apm_bios_call. 666 * 667 * Make a BIOS call that returns one value only, or just status. 668 * If there is an error, then the error code is returned in AH 669 * (bits 8-15 of eax) and this function returns non-zero (it can 670 * also return -ENOMEM). This is used for simpler BIOS operations. 671 * This call may hold interrupts off for a long time on some laptops. 672 * 673 * Note: this makes the call on the current CPU. 674 */ 675static long __apm_bios_call_simple(void *_call) 676{ 677 u8 error; 678 APM_DECL_SEGS 679 unsigned long flags; 680 int cpu; 681 struct desc_struct save_desc_40; 682 struct desc_struct *gdt; 683 struct apm_bios_call *call = _call; 684 685 cpu = get_cpu(); 686 BUG_ON(cpu != 0); 687 gdt = get_cpu_gdt_table(cpu); 688 save_desc_40 = gdt[0x40 / 8]; 689 gdt[0x40 / 8] = bad_bios_desc; 690 691 apm_irq_save(flags); 692 APM_DO_SAVE_SEGS; 693 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, 694 &call->eax); 695 APM_DO_RESTORE_SEGS; 696 apm_irq_restore(flags); 697 gdt[0x40 / 8] = save_desc_40; 698 put_cpu(); 699 return error; 700} 701 702/** 703 * apm_bios_call_simple - make a simple APM BIOS 32bit call 704 * @func: APM function to invoke 705 * @ebx_in: EBX register value for BIOS call 706 * @ecx_in: ECX register value for BIOS call 707 * @eax: EAX register on return from the BIOS call 708 * @err: bits 709 * 710 * Make a BIOS call that returns one value only, or just status. 711 * If there is an error, then the error code is returned in @err 712 * and this function returns non-zero. This is used for simpler 713 * BIOS operations. This call may hold interrupts off for a long 714 * time on some laptops. 715 */ 716static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, 717 int *err) 718{ 719 struct apm_bios_call call; 720 int ret; 721 722 call.func = func; 723 call.ebx = ebx_in; 724 call.ecx = ecx_in; 725 726 ret = on_cpu0(__apm_bios_call_simple, &call); 727 *eax = call.eax; 728 *err = call.err; 729 return ret; 730} 731 732/** 733 * apm_driver_version - APM driver version 734 * @val: loaded with the APM version on return 735 * 736 * Retrieve the APM version supported by the BIOS. This is only 737 * supported for APM 1.1 or higher. An error indicates APM 1.0 is 738 * probably present. 739 * 740 * On entry val should point to a value indicating the APM driver 741 * version with the high byte being the major and the low byte the 742 * minor number both in BCD 743 * 744 * On return it will hold the BIOS revision supported in the 745 * same format. 746 */ 747 748static int apm_driver_version(u_short *val) 749{ 750 u32 eax; 751 int err; 752 753 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err)) 754 return err; 755 *val = eax; 756 return APM_SUCCESS; 757} 758 759/** 760 * apm_get_event - get an APM event from the BIOS 761 * @event: pointer to the event 762 * @info: point to the event information 763 * 764 * The APM BIOS provides a polled information for event 765 * reporting. The BIOS expects to be polled at least every second 766 * when events are pending. When a message is found the caller should 767 * poll until no more messages are present. However, this causes 768 * problems on some laptops where a suspend event notification is 769 * not cleared until it is acknowledged. 770 * 771 * Additional information is returned in the info pointer, providing 772 * that APM 1.2 is in use. If no messges are pending the value 0x80 773 * is returned (No power management events pending). 774 */ 775static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) 776{ 777 struct apm_bios_call call; 778 779 call.func = APM_FUNC_GET_EVENT; 780 call.ebx = call.ecx = 0; 781 782 if (apm_bios_call(&call)) 783 return call.err; 784 785 *event = call.ebx; 786 if (apm_info.connection_version < 0x0102) 787 *info = ~0; /* indicate info not valid */ 788 else 789 *info = call.ecx; 790 return APM_SUCCESS; 791} 792 793/** 794 * set_power_state - set the power management state 795 * @what: which items to transition 796 * @state: state to transition to 797 * 798 * Request an APM change of state for one or more system devices. The 799 * processor state must be transitioned last of all. what holds the 800 * class of device in the upper byte and the device number (0xFF for 801 * all) for the object to be transitioned. 802 * 803 * The state holds the state to transition to, which may in fact 804 * be an acceptance of a BIOS requested state change. 805 */ 806 807static int set_power_state(u_short what, u_short state) 808{ 809 u32 eax; 810 int err; 811 812 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err)) 813 return err; 814 return APM_SUCCESS; 815} 816 817/** 818 * set_system_power_state - set system wide power state 819 * @state: which state to enter 820 * 821 * Transition the entire system into a new APM power state. 822 */ 823 824static int set_system_power_state(u_short state) 825{ 826 return set_power_state(APM_DEVICE_ALL, state); 827} 828 829/** 830 * apm_do_idle - perform power saving 831 * 832 * This function notifies the BIOS that the processor is (in the view 833 * of the OS) idle. It returns -1 in the event that the BIOS refuses 834 * to handle the idle request. On a success the function returns 1 835 * if the BIOS did clock slowing or 0 otherwise. 836 */ 837 838static int apm_do_idle(void) 839{ 840 u32 eax; 841 u8 ret = 0; 842 int idled = 0; 843 int err = 0; 844 845 if (!need_resched()) { 846 idled = 1; 847 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); 848 } 849 850 if (!idled) 851 return 0; 852 853 if (ret) { 854 static unsigned long t; 855 856 /* This always fails on some SMP boards running UP kernels. 857 * Only report the failure the first 5 times. 858 */ 859 if (++t < 5) { 860 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); 861 t = jiffies; 862 } 863 return -1; 864 } 865 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; 866 return clock_slowed; 867} 868 869/** 870 * apm_do_busy - inform the BIOS the CPU is busy 871 * 872 * Request that the BIOS brings the CPU back to full performance. 873 */ 874 875static void apm_do_busy(void) 876{ 877 u32 dummy; 878 int err; 879 880 if (clock_slowed || ALWAYS_CALL_BUSY) { 881 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); 882 clock_slowed = 0; 883 } 884} 885 886/* 887 * If no process has really been interested in 888 * the CPU for some time, we want to call BIOS 889 * power management - we probably want 890 * to conserve power. 891 */ 892#define IDLE_CALC_LIMIT (HZ * 100) 893#define IDLE_LEAKY_MAX 16 894 895/** 896 * apm_cpu_idle - cpu idling for APM capable Linux 897 * 898 * This is the idling function the kernel executes when APM is available. It 899 * tries to do BIOS powermanagement based on the average system idle time. 900 * Furthermore it calls the system default idle routine. 901 */ 902 903static int apm_cpu_idle(struct cpuidle_device *dev, 904 struct cpuidle_driver *drv, int index) 905{ 906 static int use_apm_idle; /* = 0 */ 907 static unsigned int last_jiffies; /* = 0 */ 908 static unsigned int last_stime; /* = 0 */ 909 cputime_t stime; 910 911 int apm_idle_done = 0; 912 unsigned int jiffies_since_last_check = jiffies - last_jiffies; 913 unsigned int bucket; 914 915recalc: 916 task_cputime(current, NULL, &stime); 917 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 918 use_apm_idle = 0; 919 } else if (jiffies_since_last_check > idle_period) { 920 unsigned int idle_percentage; 921 922 idle_percentage = stime - last_stime; 923 idle_percentage *= 100; 924 idle_percentage /= jiffies_since_last_check; 925 use_apm_idle = (idle_percentage > idle_threshold); 926 if (apm_info.forbid_idle) 927 use_apm_idle = 0; 928 } 929 930 last_jiffies = jiffies; 931 last_stime = stime; 932 933 bucket = IDLE_LEAKY_MAX; 934 935 while (!need_resched()) { 936 if (use_apm_idle) { 937 unsigned int t; 938 939 t = jiffies; 940 switch (apm_do_idle()) { 941 case 0: 942 apm_idle_done = 1; 943 if (t != jiffies) { 944 if (bucket) { 945 bucket = IDLE_LEAKY_MAX; 946 continue; 947 } 948 } else if (bucket) { 949 bucket--; 950 continue; 951 } 952 break; 953 case 1: 954 apm_idle_done = 1; 955 break; 956 default: /* BIOS refused */ 957 break; 958 } 959 } 960 default_idle(); 961 local_irq_disable(); 962 jiffies_since_last_check = jiffies - last_jiffies; 963 if (jiffies_since_last_check > idle_period) 964 goto recalc; 965 } 966 967 if (apm_idle_done) 968 apm_do_busy(); 969 970 return index; 971} 972 973/** 974 * apm_power_off - ask the BIOS to power off 975 * 976 * Handle the power off sequence. This is the one piece of code we 977 * will execute even on SMP machines. In order to deal with BIOS 978 * bugs we support real mode APM BIOS power off calls. We also make 979 * the SMP call on CPU0 as some systems will only honour this call 980 * on their first cpu. 981 */ 982 983static void apm_power_off(void) 984{ 985 /* Some bioses don't like being called from CPU != 0 */ 986 if (apm_info.realmode_power_off) { 987 set_cpus_allowed_ptr(current, cpumask_of(0)); 988 machine_real_restart(MRR_APM); 989 } else { 990 (void)set_system_power_state(APM_STATE_OFF); 991 } 992} 993 994#ifdef CONFIG_APM_DO_ENABLE 995 996/** 997 * apm_enable_power_management - enable BIOS APM power management 998 * @enable: enable yes/no 999 * 1000 * Enable or disable the APM BIOS power services. 1001 */ 1002 1003static int apm_enable_power_management(int enable) 1004{ 1005 u32 eax; 1006 int err; 1007 1008 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 1009 return APM_NOT_ENGAGED; 1010 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 1011 enable, &eax, &err)) 1012 return err; 1013 if (enable) 1014 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 1015 else 1016 apm_info.bios.flags |= APM_BIOS_DISABLED; 1017 return APM_SUCCESS; 1018} 1019#endif 1020 1021/** 1022 * apm_get_power_status - get current power state 1023 * @status: returned status 1024 * @bat: battery info 1025 * @life: estimated life 1026 * 1027 * Obtain the current power status from the APM BIOS. We return a 1028 * status which gives the rough battery status, and current power 1029 * source. The bat value returned give an estimate as a percentage 1030 * of life and a status value for the battery. The estimated life 1031 * if reported is a lifetime in secodnds/minutes at current powwer 1032 * consumption. 1033 */ 1034 1035static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 1036{ 1037 struct apm_bios_call call; 1038 1039 call.func = APM_FUNC_GET_STATUS; 1040 call.ebx = APM_DEVICE_ALL; 1041 call.ecx = 0; 1042 1043 if (apm_info.get_power_status_broken) 1044 return APM_32_UNSUPPORTED; 1045 if (apm_bios_call(&call)) 1046 return call.err; 1047 *status = call.ebx; 1048 *bat = call.ecx; 1049 if (apm_info.get_power_status_swabinminutes) { 1050 *life = swab16((u16)call.edx); 1051 *life |= 0x8000; 1052 } else 1053 *life = call.edx; 1054 return APM_SUCCESS; 1055} 1056 1057#if 0 1058static int apm_get_battery_status(u_short which, u_short *status, 1059 u_short *bat, u_short *life, u_short *nbat) 1060{ 1061 u32 eax; 1062 u32 ebx; 1063 u32 ecx; 1064 u32 edx; 1065 u32 esi; 1066 1067 if (apm_info.connection_version < 0x0102) { 1068 /* pretend we only have one battery. */ 1069 if (which != 1) 1070 return APM_BAD_DEVICE; 1071 *nbat = 1; 1072 return apm_get_power_status(status, bat, life); 1073 } 1074 1075 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1076 &ebx, &ecx, &edx, &esi)) 1077 return (eax >> 8) & 0xff; 1078 *status = ebx; 1079 *bat = ecx; 1080 *life = edx; 1081 *nbat = esi; 1082 return APM_SUCCESS; 1083} 1084#endif 1085 1086/** 1087 * apm_engage_power_management - enable PM on a device 1088 * @device: identity of device 1089 * @enable: on/off 1090 * 1091 * Activate or deactive power management on either a specific device 1092 * or the entire system (%APM_DEVICE_ALL). 1093 */ 1094 1095static int apm_engage_power_management(u_short device, int enable) 1096{ 1097 u32 eax; 1098 int err; 1099 1100 if ((enable == 0) && (device == APM_DEVICE_ALL) 1101 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1102 return APM_DISABLED; 1103 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, 1104 &eax, &err)) 1105 return err; 1106 if (device == APM_DEVICE_ALL) { 1107 if (enable) 1108 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1109 else 1110 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1111 } 1112 return APM_SUCCESS; 1113} 1114 1115#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1116 1117/** 1118 * apm_console_blank - blank the display 1119 * @blank: on/off 1120 * 1121 * Attempt to blank the console, firstly by blanking just video device 1122 * zero, and if that fails (some BIOSes don't support it) then it blanks 1123 * all video devices. Typically the BIOS will do laptop backlight and 1124 * monitor powerdown for us. 1125 */ 1126 1127static int apm_console_blank(int blank) 1128{ 1129 int error = APM_NOT_ENGAGED; /* silence gcc */ 1130 int i; 1131 u_short state; 1132 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1133 1134 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1135 1136 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1137 error = set_power_state(dev[i], state); 1138 1139 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1140 return 1; 1141 1142 if (error == APM_NOT_ENGAGED) 1143 break; 1144 } 1145 1146 if (error == APM_NOT_ENGAGED) { 1147 static int tried; 1148 int eng_error; 1149 if (tried++ == 0) { 1150 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1151 if (eng_error) { 1152 apm_error("set display", error); 1153 apm_error("engage interface", eng_error); 1154 return 0; 1155 } else 1156 return apm_console_blank(blank); 1157 } 1158 } 1159 apm_error("set display", error); 1160 return 0; 1161} 1162#endif 1163 1164static int queue_empty(struct apm_user *as) 1165{ 1166 return as->event_head == as->event_tail; 1167} 1168 1169static apm_event_t get_queued_event(struct apm_user *as) 1170{ 1171 if (++as->event_tail >= APM_MAX_EVENTS) 1172 as->event_tail = 0; 1173 return as->events[as->event_tail]; 1174} 1175 1176static void queue_event(apm_event_t event, struct apm_user *sender) 1177{ 1178 struct apm_user *as; 1179 1180 spin_lock(&user_list_lock); 1181 if (user_list == NULL) 1182 goto out; 1183 for (as = user_list; as != NULL; as = as->next) { 1184 if ((as == sender) || (!as->reader)) 1185 continue; 1186 if (++as->event_head >= APM_MAX_EVENTS) 1187 as->event_head = 0; 1188 1189 if (as->event_head == as->event_tail) { 1190 static int notified; 1191 1192 if (notified++ == 0) 1193 pr_err("an event queue overflowed\n"); 1194 if (++as->event_tail >= APM_MAX_EVENTS) 1195 as->event_tail = 0; 1196 } 1197 as->events[as->event_head] = event; 1198 if (!as->suser || !as->writer) 1199 continue; 1200 switch (event) { 1201 case APM_SYS_SUSPEND: 1202 case APM_USER_SUSPEND: 1203 as->suspends_pending++; 1204 suspends_pending++; 1205 break; 1206 1207 case APM_SYS_STANDBY: 1208 case APM_USER_STANDBY: 1209 as->standbys_pending++; 1210 standbys_pending++; 1211 break; 1212 } 1213 } 1214 wake_up_interruptible(&apm_waitqueue); 1215out: 1216 spin_unlock(&user_list_lock); 1217} 1218 1219static void reinit_timer(void) 1220{ 1221#ifdef INIT_TIMER_AFTER_SUSPEND 1222 unsigned long flags; 1223 1224 raw_spin_lock_irqsave(&i8253_lock, flags); 1225 /* set the clock to HZ */ 1226 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1227 udelay(10); 1228 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ 1229 udelay(10); 1230 outb_p(LATCH >> 8, PIT_CH0); /* MSB */ 1231 udelay(10); 1232 raw_spin_unlock_irqrestore(&i8253_lock, flags); 1233#endif 1234} 1235 1236static int suspend(int vetoable) 1237{ 1238 int err; 1239 struct apm_user *as; 1240 1241 dpm_suspend_start(PMSG_SUSPEND); 1242 dpm_suspend_end(PMSG_SUSPEND); 1243 1244 local_irq_disable(); 1245 syscore_suspend(); 1246 1247 local_irq_enable(); 1248 1249 save_processor_state(); 1250 err = set_system_power_state(APM_STATE_SUSPEND); 1251 ignore_normal_resume = 1; 1252 restore_processor_state(); 1253 1254 local_irq_disable(); 1255 reinit_timer(); 1256 1257 if (err == APM_NO_ERROR) 1258 err = APM_SUCCESS; 1259 if (err != APM_SUCCESS) 1260 apm_error("suspend", err); 1261 err = (err == APM_SUCCESS) ? 0 : -EIO; 1262 1263 syscore_resume(); 1264 local_irq_enable(); 1265 1266 dpm_resume_start(PMSG_RESUME); 1267 dpm_resume_end(PMSG_RESUME); 1268 1269 queue_event(APM_NORMAL_RESUME, NULL); 1270 spin_lock(&user_list_lock); 1271 for (as = user_list; as != NULL; as = as->next) { 1272 as->suspend_wait = 0; 1273 as->suspend_result = err; 1274 } 1275 spin_unlock(&user_list_lock); 1276 wake_up_interruptible(&apm_suspend_waitqueue); 1277 return err; 1278} 1279 1280static void standby(void) 1281{ 1282 int err; 1283 1284 dpm_suspend_end(PMSG_SUSPEND); 1285 1286 local_irq_disable(); 1287 syscore_suspend(); 1288 local_irq_enable(); 1289 1290 err = set_system_power_state(APM_STATE_STANDBY); 1291 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1292 apm_error("standby", err); 1293 1294 local_irq_disable(); 1295 syscore_resume(); 1296 local_irq_enable(); 1297 1298 dpm_resume_start(PMSG_RESUME); 1299} 1300 1301static apm_event_t get_event(void) 1302{ 1303 int error; 1304 apm_event_t event = APM_NO_EVENTS; /* silence gcc */ 1305 apm_eventinfo_t info; 1306 1307 static int notified; 1308 1309 /* we don't use the eventinfo */ 1310 error = apm_get_event(&event, &info); 1311 if (error == APM_SUCCESS) 1312 return event; 1313 1314 if ((error != APM_NO_EVENTS) && (notified++ == 0)) 1315 apm_error("get_event", error); 1316 1317 return 0; 1318} 1319 1320static void check_events(void) 1321{ 1322 apm_event_t event; 1323 static unsigned long last_resume; 1324 static int ignore_bounce; 1325 1326 while ((event = get_event()) != 0) { 1327 if (debug) { 1328 if (event <= NR_APM_EVENT_NAME) 1329 printk(KERN_DEBUG "apm: received %s notify\n", 1330 apm_event_name[event - 1]); 1331 else 1332 printk(KERN_DEBUG "apm: received unknown " 1333 "event 0x%02x\n", event); 1334 } 1335 if (ignore_bounce 1336 && (time_after(jiffies, last_resume + bounce_interval))) 1337 ignore_bounce = 0; 1338 1339 switch (event) { 1340 case APM_SYS_STANDBY: 1341 case APM_USER_STANDBY: 1342 queue_event(event, NULL); 1343 if (standbys_pending <= 0) 1344 standby(); 1345 break; 1346 1347 case APM_USER_SUSPEND: 1348#ifdef CONFIG_APM_IGNORE_USER_SUSPEND 1349 if (apm_info.connection_version > 0x100) 1350 set_system_power_state(APM_STATE_REJECT); 1351 break; 1352#endif 1353 case APM_SYS_SUSPEND: 1354 if (ignore_bounce) { 1355 if (apm_info.connection_version > 0x100) 1356 set_system_power_state(APM_STATE_REJECT); 1357 break; 1358 } 1359 /* 1360 * If we are already processing a SUSPEND, 1361 * then further SUSPEND events from the BIOS 1362 * will be ignored. We also return here to 1363 * cope with the fact that the Thinkpads keep 1364 * sending a SUSPEND event until something else 1365 * happens! 1366 */ 1367 if (ignore_sys_suspend) 1368 return; 1369 ignore_sys_suspend = 1; 1370 queue_event(event, NULL); 1371 if (suspends_pending <= 0) 1372 (void) suspend(1); 1373 break; 1374 1375 case APM_NORMAL_RESUME: 1376 case APM_CRITICAL_RESUME: 1377 case APM_STANDBY_RESUME: 1378 ignore_sys_suspend = 0; 1379 last_resume = jiffies; 1380 ignore_bounce = 1; 1381 if ((event != APM_NORMAL_RESUME) 1382 || (ignore_normal_resume == 0)) { 1383 dpm_resume_end(PMSG_RESUME); 1384 queue_event(event, NULL); 1385 } 1386 ignore_normal_resume = 0; 1387 break; 1388 1389 case APM_CAPABILITY_CHANGE: 1390 case APM_LOW_BATTERY: 1391 case APM_POWER_STATUS_CHANGE: 1392 queue_event(event, NULL); 1393 /* If needed, notify drivers here */ 1394 break; 1395 1396 case APM_UPDATE_TIME: 1397 break; 1398 1399 case APM_CRITICAL_SUSPEND: 1400 /* 1401 * We are not allowed to reject a critical suspend. 1402 */ 1403 (void)suspend(0); 1404 break; 1405 } 1406 } 1407} 1408 1409static void apm_event_handler(void) 1410{ 1411 static int pending_count = 4; 1412 int err; 1413 1414 if ((standbys_pending > 0) || (suspends_pending > 0)) { 1415 if ((apm_info.connection_version > 0x100) && 1416 (pending_count-- <= 0)) { 1417 pending_count = 4; 1418 if (debug) 1419 printk(KERN_DEBUG "apm: setting state busy\n"); 1420 err = set_system_power_state(APM_STATE_BUSY); 1421 if (err) 1422 apm_error("busy", err); 1423 } 1424 } else 1425 pending_count = 4; 1426 check_events(); 1427} 1428 1429/* 1430 * This is the APM thread main loop. 1431 */ 1432 1433static void apm_mainloop(void) 1434{ 1435 DECLARE_WAITQUEUE(wait, current); 1436 1437 add_wait_queue(&apm_waitqueue, &wait); 1438 set_current_state(TASK_INTERRUPTIBLE); 1439 for (;;) { 1440 schedule_timeout(APM_CHECK_TIMEOUT); 1441 if (kthread_should_stop()) 1442 break; 1443 /* 1444 * Ok, check all events, check for idle (and mark us sleeping 1445 * so as not to count towards the load average).. 1446 */ 1447 set_current_state(TASK_INTERRUPTIBLE); 1448 apm_event_handler(); 1449 } 1450 remove_wait_queue(&apm_waitqueue, &wait); 1451} 1452 1453static int check_apm_user(struct apm_user *as, const char *func) 1454{ 1455 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1456 pr_err("%s passed bad filp\n", func); 1457 return 1; 1458 } 1459 return 0; 1460} 1461 1462static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) 1463{ 1464 struct apm_user *as; 1465 int i; 1466 apm_event_t event; 1467 1468 as = fp->private_data; 1469 if (check_apm_user(as, "read")) 1470 return -EIO; 1471 if ((int)count < sizeof(apm_event_t)) 1472 return -EINVAL; 1473 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) 1474 return -EAGAIN; 1475 wait_event_interruptible(apm_waitqueue, !queue_empty(as)); 1476 i = count; 1477 while ((i >= sizeof(event)) && !queue_empty(as)) { 1478 event = get_queued_event(as); 1479 if (copy_to_user(buf, &event, sizeof(event))) { 1480 if (i < count) 1481 break; 1482 return -EFAULT; 1483 } 1484 switch (event) { 1485 case APM_SYS_SUSPEND: 1486 case APM_USER_SUSPEND: 1487 as->suspends_read++; 1488 break; 1489 1490 case APM_SYS_STANDBY: 1491 case APM_USER_STANDBY: 1492 as->standbys_read++; 1493 break; 1494 } 1495 buf += sizeof(event); 1496 i -= sizeof(event); 1497 } 1498 if (i < count) 1499 return count - i; 1500 if (signal_pending(current)) 1501 return -ERESTARTSYS; 1502 return 0; 1503} 1504 1505static unsigned int do_poll(struct file *fp, poll_table *wait) 1506{ 1507 struct apm_user *as; 1508 1509 as = fp->private_data; 1510 if (check_apm_user(as, "poll")) 1511 return 0; 1512 poll_wait(fp, &apm_waitqueue, wait); 1513 if (!queue_empty(as)) 1514 return POLLIN | POLLRDNORM; 1515 return 0; 1516} 1517 1518static long do_ioctl(struct file *filp, u_int cmd, u_long arg) 1519{ 1520 struct apm_user *as; 1521 int ret; 1522 1523 as = filp->private_data; 1524 if (check_apm_user(as, "ioctl")) 1525 return -EIO; 1526 if (!as->suser || !as->writer) 1527 return -EPERM; 1528 switch (cmd) { 1529 case APM_IOC_STANDBY: 1530 mutex_lock(&apm_mutex); 1531 if (as->standbys_read > 0) { 1532 as->standbys_read--; 1533 as->standbys_pending--; 1534 standbys_pending--; 1535 } else 1536 queue_event(APM_USER_STANDBY, as); 1537 if (standbys_pending <= 0) 1538 standby(); 1539 mutex_unlock(&apm_mutex); 1540 break; 1541 case APM_IOC_SUSPEND: 1542 mutex_lock(&apm_mutex); 1543 if (as->suspends_read > 0) { 1544 as->suspends_read--; 1545 as->suspends_pending--; 1546 suspends_pending--; 1547 } else 1548 queue_event(APM_USER_SUSPEND, as); 1549 if (suspends_pending <= 0) { 1550 ret = suspend(1); 1551 mutex_unlock(&apm_mutex); 1552 } else { 1553 as->suspend_wait = 1; 1554 mutex_unlock(&apm_mutex); 1555 wait_event_interruptible(apm_suspend_waitqueue, 1556 as->suspend_wait == 0); 1557 ret = as->suspend_result; 1558 } 1559 return ret; 1560 default: 1561 return -ENOTTY; 1562 } 1563 return 0; 1564} 1565 1566static int do_release(struct inode *inode, struct file *filp) 1567{ 1568 struct apm_user *as; 1569 1570 as = filp->private_data; 1571 if (check_apm_user(as, "release")) 1572 return 0; 1573 filp->private_data = NULL; 1574 if (as->standbys_pending > 0) { 1575 standbys_pending -= as->standbys_pending; 1576 if (standbys_pending <= 0) 1577 standby(); 1578 } 1579 if (as->suspends_pending > 0) { 1580 suspends_pending -= as->suspends_pending; 1581 if (suspends_pending <= 0) 1582 (void) suspend(1); 1583 } 1584 spin_lock(&user_list_lock); 1585 if (user_list == as) 1586 user_list = as->next; 1587 else { 1588 struct apm_user *as1; 1589 1590 for (as1 = user_list; 1591 (as1 != NULL) && (as1->next != as); 1592 as1 = as1->next) 1593 ; 1594 if (as1 == NULL) 1595 pr_err("filp not in user list\n"); 1596 else 1597 as1->next = as->next; 1598 } 1599 spin_unlock(&user_list_lock); 1600 kfree(as); 1601 return 0; 1602} 1603 1604static int do_open(struct inode *inode, struct file *filp) 1605{ 1606 struct apm_user *as; 1607 1608 as = kmalloc(sizeof(*as), GFP_KERNEL); 1609 if (as == NULL) 1610 return -ENOMEM; 1611 1612 as->magic = APM_BIOS_MAGIC; 1613 as->event_tail = as->event_head = 0; 1614 as->suspends_pending = as->standbys_pending = 0; 1615 as->suspends_read = as->standbys_read = 0; 1616 /* 1617 * XXX - this is a tiny bit broken, when we consider BSD 1618 * process accounting. If the device is opened by root, we 1619 * instantly flag that we used superuser privs. Who knows, 1620 * we might close the device immediately without doing a 1621 * privileged operation -- cevans 1622 */ 1623 as->suser = capable(CAP_SYS_ADMIN); 1624 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1625 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1626 spin_lock(&user_list_lock); 1627 as->next = user_list; 1628 user_list = as; 1629 spin_unlock(&user_list_lock); 1630 filp->private_data = as; 1631 return 0; 1632} 1633 1634static int proc_apm_show(struct seq_file *m, void *v) 1635{ 1636 unsigned short bx; 1637 unsigned short cx; 1638 unsigned short dx; 1639 int error; 1640 unsigned short ac_line_status = 0xff; 1641 unsigned short battery_status = 0xff; 1642 unsigned short battery_flag = 0xff; 1643 int percentage = -1; 1644 int time_units = -1; 1645 char *units = "?"; 1646 1647 if ((num_online_cpus() == 1) && 1648 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1649 ac_line_status = (bx >> 8) & 0xff; 1650 battery_status = bx & 0xff; 1651 if ((cx & 0xff) != 0xff) 1652 percentage = cx & 0xff; 1653 1654 if (apm_info.connection_version > 0x100) { 1655 battery_flag = (cx >> 8) & 0xff; 1656 if (dx != 0xffff) { 1657 units = (dx & 0x8000) ? "min" : "sec"; 1658 time_units = dx & 0x7fff; 1659 } 1660 } 1661 } 1662 /* Arguments, with symbols from linux/apm_bios.h. Information is 1663 from the Get Power Status (0x0a) call unless otherwise noted. 1664 1665 0) Linux driver version (this will change if format changes) 1666 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1667 2) APM flags from APM Installation Check (0x00): 1668 bit 0: APM_16_BIT_SUPPORT 1669 bit 1: APM_32_BIT_SUPPORT 1670 bit 2: APM_IDLE_SLOWS_CLOCK 1671 bit 3: APM_BIOS_DISABLED 1672 bit 4: APM_BIOS_DISENGAGED 1673 3) AC line status 1674 0x00: Off-line 1675 0x01: On-line 1676 0x02: On backup power (BIOS >= 1.1 only) 1677 0xff: Unknown 1678 4) Battery status 1679 0x00: High 1680 0x01: Low 1681 0x02: Critical 1682 0x03: Charging 1683 0x04: Selected battery not present (BIOS >= 1.2 only) 1684 0xff: Unknown 1685 5) Battery flag 1686 bit 0: High 1687 bit 1: Low 1688 bit 2: Critical 1689 bit 3: Charging 1690 bit 7: No system battery 1691 0xff: Unknown 1692 6) Remaining battery life (percentage of charge): 1693 0-100: valid 1694 -1: Unknown 1695 7) Remaining battery life (time units): 1696 Number of remaining minutes or seconds 1697 -1: Unknown 1698 8) min = minutes; sec = seconds */ 1699 1700 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1701 driver_version, 1702 (apm_info.bios.version >> 8) & 0xff, 1703 apm_info.bios.version & 0xff, 1704 apm_info.bios.flags, 1705 ac_line_status, 1706 battery_status, 1707 battery_flag, 1708 percentage, 1709 time_units, 1710 units); 1711 return 0; 1712} 1713 1714static int proc_apm_open(struct inode *inode, struct file *file) 1715{ 1716 return single_open(file, proc_apm_show, NULL); 1717} 1718 1719static const struct file_operations apm_file_ops = { 1720 .owner = THIS_MODULE, 1721 .open = proc_apm_open, 1722 .read = seq_read, 1723 .llseek = seq_lseek, 1724 .release = single_release, 1725}; 1726 1727static int apm(void *unused) 1728{ 1729 unsigned short bx; 1730 unsigned short cx; 1731 unsigned short dx; 1732 int error; 1733 char *power_stat; 1734 char *bat_stat; 1735 1736 /* 2002/08/01 - WT 1737 * This is to avoid random crashes at boot time during initialization 1738 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1739 * Some bioses don't like being called from CPU != 0. 1740 * Method suggested by Ingo Molnar. 1741 */ 1742 set_cpus_allowed_ptr(current, cpumask_of(0)); 1743 BUG_ON(smp_processor_id() != 0); 1744 1745 if (apm_info.connection_version == 0) { 1746 apm_info.connection_version = apm_info.bios.version; 1747 if (apm_info.connection_version > 0x100) { 1748 /* 1749 * We only support BIOSs up to version 1.2 1750 */ 1751 if (apm_info.connection_version > 0x0102) 1752 apm_info.connection_version = 0x0102; 1753 error = apm_driver_version(&apm_info.connection_version); 1754 if (error != APM_SUCCESS) { 1755 apm_error("driver version", error); 1756 /* Fall back to an APM 1.0 connection. */ 1757 apm_info.connection_version = 0x100; 1758 } 1759 } 1760 } 1761 1762 if (debug) 1763 printk(KERN_INFO "apm: Connection version %d.%d\n", 1764 (apm_info.connection_version >> 8) & 0xff, 1765 apm_info.connection_version & 0xff); 1766 1767#ifdef CONFIG_APM_DO_ENABLE 1768 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1769 /* 1770 * This call causes my NEC UltraLite Versa 33/C to hang if it 1771 * is booted with PM disabled but not in the docking station. 1772 * Unfortunate ... 1773 */ 1774 error = apm_enable_power_management(1); 1775 if (error) { 1776 apm_error("enable power management", error); 1777 return -1; 1778 } 1779 } 1780#endif 1781 1782 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1783 && (apm_info.connection_version > 0x0100)) { 1784 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1785 if (error) { 1786 apm_error("engage power management", error); 1787 return -1; 1788 } 1789 } 1790 1791 if (debug && (num_online_cpus() == 1 || smp)) { 1792 error = apm_get_power_status(&bx, &cx, &dx); 1793 if (error) 1794 printk(KERN_INFO "apm: power status not available\n"); 1795 else { 1796 switch ((bx >> 8) & 0xff) { 1797 case 0: 1798 power_stat = "off line"; 1799 break; 1800 case 1: 1801 power_stat = "on line"; 1802 break; 1803 case 2: 1804 power_stat = "on backup power"; 1805 break; 1806 default: 1807 power_stat = "unknown"; 1808 break; 1809 } 1810 switch (bx & 0xff) { 1811 case 0: 1812 bat_stat = "high"; 1813 break; 1814 case 1: 1815 bat_stat = "low"; 1816 break; 1817 case 2: 1818 bat_stat = "critical"; 1819 break; 1820 case 3: 1821 bat_stat = "charging"; 1822 break; 1823 default: 1824 bat_stat = "unknown"; 1825 break; 1826 } 1827 printk(KERN_INFO 1828 "apm: AC %s, battery status %s, battery life ", 1829 power_stat, bat_stat); 1830 if ((cx & 0xff) == 0xff) 1831 printk("unknown\n"); 1832 else 1833 printk("%d%%\n", cx & 0xff); 1834 if (apm_info.connection_version > 0x100) { 1835 printk(KERN_INFO 1836 "apm: battery flag 0x%02x, battery life ", 1837 (cx >> 8) & 0xff); 1838 if (dx == 0xffff) 1839 printk("unknown\n"); 1840 else 1841 printk("%d %s\n", dx & 0x7fff, 1842 (dx & 0x8000) ? 1843 "minutes" : "seconds"); 1844 } 1845 } 1846 } 1847 1848 /* Install our power off handler.. */ 1849 if (power_off) 1850 pm_power_off = apm_power_off; 1851 1852 if (num_online_cpus() == 1 || smp) { 1853#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1854 console_blank_hook = apm_console_blank; 1855#endif 1856 apm_mainloop(); 1857#if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1858 console_blank_hook = NULL; 1859#endif 1860 } 1861 1862 return 0; 1863} 1864 1865#ifndef MODULE 1866static int __init apm_setup(char *str) 1867{ 1868 int invert; 1869 1870 while ((str != NULL) && (*str != '\0')) { 1871 if (strncmp(str, "off", 3) == 0) 1872 apm_disabled = 1; 1873 if (strncmp(str, "on", 2) == 0) 1874 apm_disabled = 0; 1875 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1876 (strncmp(str, "bounce_interval=", 16) == 0)) 1877 bounce_interval = simple_strtol(str + 16, NULL, 0); 1878 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1879 (strncmp(str, "idle_threshold=", 15) == 0)) 1880 idle_threshold = simple_strtol(str + 15, NULL, 0); 1881 if ((strncmp(str, "idle-period=", 12) == 0) || 1882 (strncmp(str, "idle_period=", 12) == 0)) 1883 idle_period = simple_strtol(str + 12, NULL, 0); 1884 invert = (strncmp(str, "no-", 3) == 0) || 1885 (strncmp(str, "no_", 3) == 0); 1886 if (invert) 1887 str += 3; 1888 if (strncmp(str, "debug", 5) == 0) 1889 debug = !invert; 1890 if ((strncmp(str, "power-off", 9) == 0) || 1891 (strncmp(str, "power_off", 9) == 0)) 1892 power_off = !invert; 1893 if (strncmp(str, "smp", 3) == 0) { 1894 smp = !invert; 1895 idle_threshold = 100; 1896 } 1897 if ((strncmp(str, "allow-ints", 10) == 0) || 1898 (strncmp(str, "allow_ints", 10) == 0)) 1899 apm_info.allow_ints = !invert; 1900 if ((strncmp(str, "broken-psr", 10) == 0) || 1901 (strncmp(str, "broken_psr", 10) == 0)) 1902 apm_info.get_power_status_broken = !invert; 1903 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1904 (strncmp(str, "realmode_power_off", 18) == 0)) 1905 apm_info.realmode_power_off = !invert; 1906 str = strchr(str, ','); 1907 if (str != NULL) 1908 str += strspn(str, ", \t"); 1909 } 1910 return 1; 1911} 1912 1913__setup("apm=", apm_setup); 1914#endif 1915 1916static const struct file_operations apm_bios_fops = { 1917 .owner = THIS_MODULE, 1918 .read = do_read, 1919 .poll = do_poll, 1920 .unlocked_ioctl = do_ioctl, 1921 .open = do_open, 1922 .release = do_release, 1923 .llseek = noop_llseek, 1924}; 1925 1926static struct miscdevice apm_device = { 1927 APM_MINOR_DEV, 1928 "apm_bios", 1929 &apm_bios_fops 1930}; 1931 1932 1933/* Simple "print if true" callback */ 1934static int __init print_if_true(const struct dmi_system_id *d) 1935{ 1936 printk("%s\n", d->ident); 1937 return 0; 1938} 1939 1940/* 1941 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1942 * disabled before the suspend. Linux used to get terribly confused by that. 1943 */ 1944static int __init broken_ps2_resume(const struct dmi_system_id *d) 1945{ 1946 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1947 "workaround hopefully not needed.\n", d->ident); 1948 return 0; 1949} 1950 1951/* Some bioses have a broken protected mode poweroff and need to use realmode */ 1952static int __init set_realmode_power_off(const struct dmi_system_id *d) 1953{ 1954 if (apm_info.realmode_power_off == 0) { 1955 apm_info.realmode_power_off = 1; 1956 printk(KERN_INFO "%s bios detected. " 1957 "Using realmode poweroff only.\n", d->ident); 1958 } 1959 return 0; 1960} 1961 1962/* Some laptops require interrupts to be enabled during APM calls */ 1963static int __init set_apm_ints(const struct dmi_system_id *d) 1964{ 1965 if (apm_info.allow_ints == 0) { 1966 apm_info.allow_ints = 1; 1967 printk(KERN_INFO "%s machine detected. " 1968 "Enabling interrupts during APM calls.\n", d->ident); 1969 } 1970 return 0; 1971} 1972 1973/* Some APM bioses corrupt memory or just plain do not work */ 1974static int __init apm_is_horked(const struct dmi_system_id *d) 1975{ 1976 if (apm_info.disabled == 0) { 1977 apm_info.disabled = 1; 1978 printk(KERN_INFO "%s machine detected. " 1979 "Disabling APM.\n", d->ident); 1980 } 1981 return 0; 1982} 1983 1984static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1985{ 1986 if (apm_info.disabled == 0) { 1987 apm_info.disabled = 1; 1988 printk(KERN_INFO "%s machine detected. " 1989 "Disabling APM.\n", d->ident); 1990 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); 1991 printk(KERN_INFO "download from support.intel.com\n"); 1992 } 1993 return 0; 1994} 1995 1996/* Some APM bioses hang on APM idle calls */ 1997static int __init apm_likes_to_melt(const struct dmi_system_id *d) 1998{ 1999 if (apm_info.forbid_idle == 0) { 2000 apm_info.forbid_idle = 1; 2001 printk(KERN_INFO "%s machine detected. " 2002 "Disabling APM idle calls.\n", d->ident); 2003 } 2004 return 0; 2005} 2006 2007/* 2008 * Check for clue free BIOS implementations who use 2009 * the following QA technique 2010 * 2011 * [ Write BIOS Code ]<------ 2012 * | ^ 2013 * < Does it Compile >----N-- 2014 * |Y ^ 2015 * < Does it Boot Win98 >-N-- 2016 * |Y 2017 * [Ship It] 2018 * 2019 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 2020 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 2021 */ 2022static int __init broken_apm_power(const struct dmi_system_id *d) 2023{ 2024 apm_info.get_power_status_broken = 1; 2025 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 2026 "disabling power status reporting.\n"); 2027 return 0; 2028} 2029 2030/* 2031 * This bios swaps the APM minute reporting bytes over (Many sony laptops 2032 * have this problem). 2033 */ 2034static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 2035{ 2036 apm_info.get_power_status_swabinminutes = 1; 2037 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 2038 "in minutes and wrong byte order.\n"); 2039 return 0; 2040} 2041 2042static struct dmi_system_id __initdata apm_dmi_table[] = { 2043 { 2044 print_if_true, 2045 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2046 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2047 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2048 }, 2049 { /* Handle problems with APM on the C600 */ 2050 broken_ps2_resume, "Dell Latitude C600", 2051 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2052 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2053 }, 2054 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2055 set_apm_ints, "Dell Latitude", 2056 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2057 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2058 }, 2059 { /* APM crashes */ 2060 apm_is_horked, "Dell Inspiron 2500", 2061 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2062 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2063 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2064 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2065 }, 2066 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2067 set_apm_ints, "Dell Inspiron", { 2068 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2069 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2070 }, 2071 { /* Handle problems with APM on Inspiron 5000e */ 2072 broken_apm_power, "Dell Inspiron 5000e", 2073 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2074 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2075 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2076 }, 2077 { /* Handle problems with APM on Inspiron 2500 */ 2078 broken_apm_power, "Dell Inspiron 2500", 2079 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2080 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2081 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2082 }, 2083 { /* APM crashes */ 2084 apm_is_horked, "Dell Dimension 4100", 2085 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2086 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2087 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2088 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2089 }, 2090 { /* Allow interrupts during suspend on Compaq Laptops*/ 2091 set_apm_ints, "Compaq 12XL125", 2092 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2093 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2094 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2095 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2096 }, 2097 { /* Allow interrupts during APM or the clock goes slow */ 2098 set_apm_ints, "ASUSTeK", 2099 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2100 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2101 }, 2102 { /* APM blows on shutdown */ 2103 apm_is_horked, "ABIT KX7-333[R]", 2104 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2105 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2106 }, 2107 { /* APM crashes */ 2108 apm_is_horked, "Trigem Delhi3", 2109 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2110 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2111 }, 2112 { /* APM crashes */ 2113 apm_is_horked, "Fujitsu-Siemens", 2114 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2115 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2116 }, 2117 { /* APM crashes */ 2118 apm_is_horked_d850md, "Intel D850MD", 2119 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2120 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2121 }, 2122 { /* APM crashes */ 2123 apm_is_horked, "Intel D810EMO", 2124 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2125 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2126 }, 2127 { /* APM crashes */ 2128 apm_is_horked, "Dell XPS-Z", 2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2130 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2131 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2132 }, 2133 { /* APM crashes */ 2134 apm_is_horked, "Sharp PC-PJ/AX", 2135 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2136 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2137 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2138 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2139 }, 2140 { /* APM crashes */ 2141 apm_is_horked, "Dell Inspiron 2500", 2142 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2143 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2144 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2145 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2146 }, 2147 { /* APM idle hangs */ 2148 apm_likes_to_melt, "Jabil AMD", 2149 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2150 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2151 }, 2152 { /* APM idle hangs */ 2153 apm_likes_to_melt, "AMI Bios", 2154 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2155 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2156 }, 2157 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2158 swab_apm_power_in_minutes, "Sony VAIO", 2159 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2160 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2161 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2162 }, 2163 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2164 swab_apm_power_in_minutes, "Sony VAIO", 2165 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2166 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2167 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2168 }, 2169 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2170 swab_apm_power_in_minutes, "Sony VAIO", 2171 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2172 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2173 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2174 }, 2175 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2176 swab_apm_power_in_minutes, "Sony VAIO", 2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2178 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2179 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2180 }, 2181 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2182 swab_apm_power_in_minutes, "Sony VAIO", 2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2184 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2185 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2186 }, 2187 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2188 swab_apm_power_in_minutes, "Sony VAIO", 2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2190 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2191 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2192 }, 2193 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2194 swab_apm_power_in_minutes, "Sony VAIO", 2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2196 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2197 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2198 }, 2199 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2200 swab_apm_power_in_minutes, "Sony VAIO", 2201 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2202 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2203 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2204 }, 2205 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2206 swab_apm_power_in_minutes, "Sony VAIO", 2207 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2208 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2209 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2210 }, 2211 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2212 swab_apm_power_in_minutes, "Sony VAIO", 2213 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2214 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2215 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2216 }, 2217 2218 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2219 swab_apm_power_in_minutes, "Sony VAIO", 2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2221 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2222 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2223 }, 2224 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2225 swab_apm_power_in_minutes, "Sony VAIO", 2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2228 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2229 }, 2230 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2231 swab_apm_power_in_minutes, "Sony VAIO", 2232 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2233 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2234 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2235 }, 2236 { /* broken PM poweroff bios */ 2237 set_realmode_power_off, "Award Software v4.60 PGMA", 2238 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2239 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2240 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2241 }, 2242 2243 /* Generic per vendor APM settings */ 2244 2245 { /* Allow interrupts during suspend on IBM laptops */ 2246 set_apm_ints, "IBM", 2247 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2248 }, 2249 2250 { } 2251}; 2252 2253/* 2254 * Just start the APM thread. We do NOT want to do APM BIOS 2255 * calls from anything but the APM thread, if for no other reason 2256 * than the fact that we don't trust the APM BIOS. This way, 2257 * most common APM BIOS problems that lead to protection errors 2258 * etc will have at least some level of being contained... 2259 * 2260 * In short, if something bad happens, at least we have a choice 2261 * of just killing the apm thread.. 2262 */ 2263static int __init apm_init(void) 2264{ 2265 struct desc_struct *gdt; 2266 int err; 2267 2268 dmi_check_system(apm_dmi_table); 2269 2270 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { 2271 printk(KERN_INFO "apm: BIOS not found.\n"); 2272 return -ENODEV; 2273 } 2274 printk(KERN_INFO 2275 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2276 ((apm_info.bios.version >> 8) & 0xff), 2277 (apm_info.bios.version & 0xff), 2278 apm_info.bios.flags, 2279 driver_version); 2280 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2281 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2282 return -ENODEV; 2283 } 2284 2285 if (allow_ints) 2286 apm_info.allow_ints = 1; 2287 if (broken_psr) 2288 apm_info.get_power_status_broken = 1; 2289 if (realmode_power_off) 2290 apm_info.realmode_power_off = 1; 2291 /* User can override, but default is to trust DMI */ 2292 if (apm_disabled != -1) 2293 apm_info.disabled = apm_disabled; 2294 2295 /* 2296 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2297 * but is reportedly a 1.0 BIOS. 2298 */ 2299 if (apm_info.bios.version == 0x001) 2300 apm_info.bios.version = 0x100; 2301 2302 /* BIOS < 1.2 doesn't set cseg_16_len */ 2303 if (apm_info.bios.version < 0x102) 2304 apm_info.bios.cseg_16_len = 0; /* 64k */ 2305 2306 if (debug) { 2307 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2308 apm_info.bios.cseg, apm_info.bios.offset, 2309 apm_info.bios.cseg_16, apm_info.bios.dseg); 2310 if (apm_info.bios.version > 0x100) 2311 printk(" cseg len %x, dseg len %x", 2312 apm_info.bios.cseg_len, 2313 apm_info.bios.dseg_len); 2314 if (apm_info.bios.version > 0x101) 2315 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2316 printk("\n"); 2317 } 2318 2319 if (apm_info.disabled) { 2320 pr_notice("disabled on user request.\n"); 2321 return -ENODEV; 2322 } 2323 if ((num_online_cpus() > 1) && !power_off && !smp) { 2324 pr_notice("disabled - APM is not SMP safe.\n"); 2325 apm_info.disabled = 1; 2326 return -ENODEV; 2327 } 2328 if (!acpi_disabled) { 2329 pr_notice("overridden by ACPI.\n"); 2330 apm_info.disabled = 1; 2331 return -ENODEV; 2332 } 2333 2334 /* 2335 * Set up the long jump entry point to the APM BIOS, which is called 2336 * from inline assembly. 2337 */ 2338 apm_bios_entry.offset = apm_info.bios.offset; 2339 apm_bios_entry.segment = APM_CS; 2340 2341 /* 2342 * The APM 1.1 BIOS is supposed to provide limit information that it 2343 * recognizes. Many machines do this correctly, but many others do 2344 * not restrict themselves to their claimed limit. When this happens, 2345 * they will cause a segmentation violation in the kernel at boot time. 2346 * Most BIOS's, however, will respect a 64k limit, so we use that. 2347 * 2348 * Note we only set APM segments on CPU zero, since we pin the APM 2349 * code to that CPU. 2350 */ 2351 gdt = get_cpu_gdt_table(0); 2352 set_desc_base(&gdt[APM_CS >> 3], 2353 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); 2354 set_desc_base(&gdt[APM_CS_16 >> 3], 2355 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); 2356 set_desc_base(&gdt[APM_DS >> 3], 2357 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); 2358 2359 proc_create("apm", 0, NULL, &apm_file_ops); 2360 2361 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2362 if (IS_ERR(kapmd_task)) { 2363 pr_err("disabled - Unable to start kernel thread\n"); 2364 err = PTR_ERR(kapmd_task); 2365 kapmd_task = NULL; 2366 remove_proc_entry("apm", NULL); 2367 return err; 2368 } 2369 wake_up_process(kapmd_task); 2370 2371 if (num_online_cpus() > 1 && !smp) { 2372 printk(KERN_NOTICE 2373 "apm: disabled - APM is not SMP safe (power off active).\n"); 2374 return 0; 2375 } 2376 2377 /* 2378 * Note we don't actually care if the misc_device cannot be registered. 2379 * this driver can do its job without it, even if userspace can't 2380 * control it. just log the error 2381 */ 2382 if (misc_register(&apm_device)) 2383 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2384 2385 if (HZ != 100) 2386 idle_period = (idle_period * HZ) / 100; 2387 if (idle_threshold < 100) { 2388 if (!cpuidle_register_driver(&apm_idle_driver)) 2389 if (cpuidle_register_device(&apm_cpuidle_device)) 2390 cpuidle_unregister_driver(&apm_idle_driver); 2391 } 2392 2393 return 0; 2394} 2395 2396static void __exit apm_exit(void) 2397{ 2398 int error; 2399 2400 cpuidle_unregister_device(&apm_cpuidle_device); 2401 cpuidle_unregister_driver(&apm_idle_driver); 2402 2403 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) 2404 && (apm_info.connection_version > 0x0100)) { 2405 error = apm_engage_power_management(APM_DEVICE_ALL, 0); 2406 if (error) 2407 apm_error("disengage power management", error); 2408 } 2409 misc_deregister(&apm_device); 2410 remove_proc_entry("apm", NULL); 2411 if (power_off) 2412 pm_power_off = NULL; 2413 if (kapmd_task) { 2414 kthread_stop(kapmd_task); 2415 kapmd_task = NULL; 2416 } 2417} 2418 2419module_init(apm_init); 2420module_exit(apm_exit); 2421 2422MODULE_AUTHOR("Stephen Rothwell"); 2423MODULE_DESCRIPTION("Advanced Power Management"); 2424MODULE_LICENSE("GPL"); 2425module_param(debug, bool, 0644); 2426MODULE_PARM_DESC(debug, "Enable debug mode"); 2427module_param(power_off, bool, 0444); 2428MODULE_PARM_DESC(power_off, "Enable power off"); 2429module_param(bounce_interval, int, 0444); 2430MODULE_PARM_DESC(bounce_interval, 2431 "Set the number of ticks to ignore suspend bounces"); 2432module_param(allow_ints, bool, 0444); 2433MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2434module_param(broken_psr, bool, 0444); 2435MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2436module_param(realmode_power_off, bool, 0444); 2437MODULE_PARM_DESC(realmode_power_off, 2438 "Switch to real mode before powering off"); 2439module_param(idle_threshold, int, 0444); 2440MODULE_PARM_DESC(idle_threshold, 2441 "System idle percentage above which to make APM BIOS idle calls"); 2442module_param(idle_period, int, 0444); 2443MODULE_PARM_DESC(idle_period, 2444 "Period (in sec/100) over which to caculate the idle percentage"); 2445module_param(smp, bool, 0444); 2446MODULE_PARM_DESC(smp, 2447 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2448MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2449