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 #include <linux/module.h> 205 206 #include <linux/poll.h> 207 #include <linux/types.h> 208 #include <linux/stddef.h> 209 #include <linux/timer.h> 210 #include <linux/fcntl.h> 211 #include <linux/slab.h> 212 #include <linux/stat.h> 213 #include <linux/proc_fs.h> 214 #include <linux/seq_file.h> 215 #include <linux/miscdevice.h> 216 #include <linux/apm_bios.h> 217 #include <linux/init.h> 218 #include <linux/time.h> 219 #include <linux/sched.h> 220 #include <linux/pm.h> 221 #include <linux/capability.h> 222 #include <linux/device.h> 223 #include <linux/kernel.h> 224 #include <linux/freezer.h> 225 #include <linux/smp.h> 226 #include <linux/dmi.h> 227 #include <linux/suspend.h> 228 #include <linux/kthread.h> 229 #include <linux/jiffies.h> 230 #include <linux/acpi.h> 231 #include <linux/syscore_ops.h> 232 233 #include <asm/system.h> 234 #include <asm/uaccess.h> 235 #include <asm/desc.h> 236 #include <asm/i8253.h> 237 #include <asm/olpc.h> 238 #include <asm/paravirt.h> 239 #include <asm/reboot.h> 240 241 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 242 extern int (*console_blank_hook)(int); 243 #endif 244 245 /* 246 * The apm_bios device is one of the misc char devices. 247 * This is its minor number. 248 */ 249 #define APM_MINOR_DEV 134 250 251 /* 252 * See Documentation/Config.help for the configuration options. 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 */ 338 struct 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) 369 370 /* 371 * Local variables 372 */ 373 static struct { 374 unsigned long offset; 375 unsigned short segment; 376 } apm_bios_entry; 377 static int clock_slowed; 378 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; 379 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; 380 static int set_pm_idle; 381 static int suspends_pending; 382 static int standbys_pending; 383 static int ignore_sys_suspend; 384 static int ignore_normal_resume; 385 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; 386 387 static int debug __read_mostly; 388 static int smp __read_mostly; 389 static int apm_disabled = -1; 390 #ifdef CONFIG_SMP 391 static int power_off; 392 #else 393 static int power_off = 1; 394 #endif 395 static int realmode_power_off; 396 #ifdef CONFIG_APM_ALLOW_INTS 397 static int allow_ints = 1; 398 #else 399 static int allow_ints; 400 #endif 401 static int broken_psr; 402 403 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); 404 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); 405 static struct apm_user *user_list; 406 static DEFINE_SPINLOCK(user_list_lock); 407 static DEFINE_MUTEX(apm_mutex); 408 409 /* 410 * Set up a segment that references the real mode segment 0x40 411 * that extends up to the end of page zero (that we have reserved). 412 * This is for buggy BIOS's that refer to (real mode) segment 0x40 413 * even though they are called in protected mode. 414 */ 415 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, 416 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); 417 418 static const char driver_version[] = "1.16ac"; /* no spaces */ 419 420 static struct task_struct *kapmd_task; 421 422 /* 423 * APM event names taken from the APM 1.2 specification. These are 424 * the message codes that the BIOS uses to tell us about events 425 */ 426 static const char * const apm_event_name[] = { 427 "system standby", 428 "system suspend", 429 "normal resume", 430 "critical resume", 431 "low battery", 432 "power status change", 433 "update time", 434 "critical suspend", 435 "user standby", 436 "user suspend", 437 "system standby resume", 438 "capabilities change" 439 }; 440 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) 441 442 typedef struct lookup_t { 443 int key; 444 char *msg; 445 } lookup_t; 446 447 /* 448 * The BIOS returns a set of standard error codes in AX when the 449 * carry flag is set. 450 */ 451 452 static const lookup_t error_table[] = { 453 /* N/A { APM_SUCCESS, "Operation succeeded" }, */ 454 { APM_DISABLED, "Power management disabled" }, 455 { APM_CONNECTED, "Real mode interface already connected" }, 456 { APM_NOT_CONNECTED, "Interface not connected" }, 457 { APM_16_CONNECTED, "16 bit interface already connected" }, 458 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ 459 { APM_32_CONNECTED, "32 bit interface already connected" }, 460 { APM_32_UNSUPPORTED, "32 bit interface not supported" }, 461 { APM_BAD_DEVICE, "Unrecognized device ID" }, 462 { APM_BAD_PARAM, "Parameter out of range" }, 463 { APM_NOT_ENGAGED, "Interface not engaged" }, 464 { APM_BAD_FUNCTION, "Function not supported" }, 465 { APM_RESUME_DISABLED, "Resume timer disabled" }, 466 { APM_BAD_STATE, "Unable to enter requested state" }, 467 /* N/A { APM_NO_EVENTS, "No events pending" }, */ 468 { APM_NO_ERROR, "BIOS did not set a return code" }, 469 { APM_NOT_PRESENT, "No APM present" } 470 }; 471 #define ERROR_COUNT ARRAY_SIZE(error_table) 472 473 /** 474 * apm_error - display an APM error 475 * @str: information string 476 * @err: APM BIOS return code 477 * 478 * Write a meaningful log entry to the kernel log in the event of 479 * an APM error. Note that this also handles (negative) kernel errors. 480 */ 481 482 static void apm_error(char *str, int err) 483 { 484 int i; 485 486 for (i = 0; i < ERROR_COUNT; i++) 487 if (error_table[i].key == err) 488 break; 489 if (i < ERROR_COUNT) 490 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg); 491 else if (err < 0) 492 printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err); 493 else 494 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n", 495 str, err); 496 } 497 498 /* 499 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and 500 * apm_info.allow_ints, we are being really paranoid here! Not only 501 * are interrupts disabled, but all the segment registers (except SS) 502 * are saved and zeroed this means that if the BIOS tries to reference 503 * any data without explicitly loading the segment registers, the kernel 504 * will fault immediately rather than have some unforeseen circumstances 505 * for the rest of the kernel. And it will be very obvious! :-) Doing 506 * this depends on CS referring to the same physical memory as DS so that 507 * DS can be zeroed before the call. Unfortunately, we can't do anything 508 * about the stack segment/pointer. Also, we tell the compiler that 509 * everything could change. 510 * 511 * Also, we KNOW that for the non error case of apm_bios_call, there 512 * is no useful data returned in the low order 8 bits of eax. 513 */ 514 515 static inline unsigned long __apm_irq_save(void) 516 { 517 unsigned long flags; 518 local_save_flags(flags); 519 if (apm_info.allow_ints) { 520 if (irqs_disabled_flags(flags)) 521 local_irq_enable(); 522 } else 523 local_irq_disable(); 524 525 return flags; 526 } 527 528 #define apm_irq_save(flags) \ 529 do { flags = __apm_irq_save(); } while (0) 530 531 static inline void apm_irq_restore(unsigned long flags) 532 { 533 if (irqs_disabled_flags(flags)) 534 local_irq_disable(); 535 else if (irqs_disabled()) 536 local_irq_enable(); 537 } 538 539 #ifdef APM_ZERO_SEGS 540 # define APM_DECL_SEGS \ 541 unsigned int saved_fs; unsigned int saved_gs; 542 # define APM_DO_SAVE_SEGS \ 543 savesegment(fs, saved_fs); savesegment(gs, saved_gs) 544 # define APM_DO_RESTORE_SEGS \ 545 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) 546 #else 547 # define APM_DECL_SEGS 548 # define APM_DO_SAVE_SEGS 549 # define APM_DO_RESTORE_SEGS 550 #endif 551 552 struct apm_bios_call { 553 u32 func; 554 /* In and out */ 555 u32 ebx; 556 u32 ecx; 557 /* Out only */ 558 u32 eax; 559 u32 edx; 560 u32 esi; 561 562 /* Error: -ENOMEM, or bits 8-15 of eax */ 563 int err; 564 }; 565 566 /** 567 * __apm_bios_call - Make an APM BIOS 32bit call 568 * @_call: pointer to struct apm_bios_call. 569 * 570 * Make an APM call using the 32bit protected mode interface. The 571 * caller is responsible for knowing if APM BIOS is configured and 572 * enabled. This call can disable interrupts for a long period of 573 * time on some laptops. The return value is in AH and the carry 574 * flag is loaded into AL. If there is an error, then the error 575 * code is returned in AH (bits 8-15 of eax) and this function 576 * returns non-zero. 577 * 578 * Note: this makes the call on the current CPU. 579 */ 580 static long __apm_bios_call(void *_call) 581 { 582 APM_DECL_SEGS 583 unsigned long flags; 584 int cpu; 585 struct desc_struct save_desc_40; 586 struct desc_struct *gdt; 587 struct apm_bios_call *call = _call; 588 589 cpu = get_cpu(); 590 BUG_ON(cpu != 0); 591 gdt = get_cpu_gdt_table(cpu); 592 save_desc_40 = gdt[0x40 / 8]; 593 gdt[0x40 / 8] = bad_bios_desc; 594 595 apm_irq_save(flags); 596 APM_DO_SAVE_SEGS; 597 apm_bios_call_asm(call->func, call->ebx, call->ecx, 598 &call->eax, &call->ebx, &call->ecx, &call->edx, 599 &call->esi); 600 APM_DO_RESTORE_SEGS; 601 apm_irq_restore(flags); 602 gdt[0x40 / 8] = save_desc_40; 603 put_cpu(); 604 605 return call->eax & 0xff; 606 } 607 608 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ 609 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) 610 { 611 int ret; 612 613 /* Don't bother with work_on_cpu in the common case, so we don't 614 * have to worry about OOM or overhead. */ 615 if (get_cpu() == 0) { 616 ret = fn(call); 617 put_cpu(); 618 } else { 619 put_cpu(); 620 ret = work_on_cpu(0, fn, call); 621 } 622 623 /* work_on_cpu can fail with -ENOMEM */ 624 if (ret < 0) 625 call->err = ret; 626 else 627 call->err = (call->eax >> 8) & 0xff; 628 629 return ret; 630 } 631 632 /** 633 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) 634 * @call: the apm_bios_call registers. 635 * 636 * If there is an error, it is returned in @call.err. 637 */ 638 static int apm_bios_call(struct apm_bios_call *call) 639 { 640 return on_cpu0(__apm_bios_call, call); 641 } 642 643 /** 644 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) 645 * @_call: pointer to struct apm_bios_call. 646 * 647 * Make a BIOS call that returns one value only, or just status. 648 * If there is an error, then the error code is returned in AH 649 * (bits 8-15 of eax) and this function returns non-zero (it can 650 * also return -ENOMEM). This is used for simpler BIOS operations. 651 * This call may hold interrupts off for a long time on some laptops. 652 * 653 * Note: this makes the call on the current CPU. 654 */ 655 static long __apm_bios_call_simple(void *_call) 656 { 657 u8 error; 658 APM_DECL_SEGS 659 unsigned long flags; 660 int cpu; 661 struct desc_struct save_desc_40; 662 struct desc_struct *gdt; 663 struct apm_bios_call *call = _call; 664 665 cpu = get_cpu(); 666 BUG_ON(cpu != 0); 667 gdt = get_cpu_gdt_table(cpu); 668 save_desc_40 = gdt[0x40 / 8]; 669 gdt[0x40 / 8] = bad_bios_desc; 670 671 apm_irq_save(flags); 672 APM_DO_SAVE_SEGS; 673 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, 674 &call->eax); 675 APM_DO_RESTORE_SEGS; 676 apm_irq_restore(flags); 677 gdt[0x40 / 8] = save_desc_40; 678 put_cpu(); 679 return error; 680 } 681 682 /** 683 * apm_bios_call_simple - make a simple APM BIOS 32bit call 684 * @func: APM function to invoke 685 * @ebx_in: EBX register value for BIOS call 686 * @ecx_in: ECX register value for BIOS call 687 * @eax: EAX register on return from the BIOS call 688 * @err: bits 689 * 690 * Make a BIOS call that returns one value only, or just status. 691 * If there is an error, then the error code is returned in @err 692 * and this function returns non-zero. This is used for simpler 693 * BIOS operations. This call may hold interrupts off for a long 694 * time on some laptops. 695 */ 696 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, 697 int *err) 698 { 699 struct apm_bios_call call; 700 int ret; 701 702 call.func = func; 703 call.ebx = ebx_in; 704 call.ecx = ecx_in; 705 706 ret = on_cpu0(__apm_bios_call_simple, &call); 707 *eax = call.eax; 708 *err = call.err; 709 return ret; 710 } 711 712 /** 713 * apm_driver_version - APM driver version 714 * @val: loaded with the APM version on return 715 * 716 * Retrieve the APM version supported by the BIOS. This is only 717 * supported for APM 1.1 or higher. An error indicates APM 1.0 is 718 * probably present. 719 * 720 * On entry val should point to a value indicating the APM driver 721 * version with the high byte being the major and the low byte the 722 * minor number both in BCD 723 * 724 * On return it will hold the BIOS revision supported in the 725 * same format. 726 */ 727 728 static int apm_driver_version(u_short *val) 729 { 730 u32 eax; 731 int err; 732 733 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err)) 734 return err; 735 *val = eax; 736 return APM_SUCCESS; 737 } 738 739 /** 740 * apm_get_event - get an APM event from the BIOS 741 * @event: pointer to the event 742 * @info: point to the event information 743 * 744 * The APM BIOS provides a polled information for event 745 * reporting. The BIOS expects to be polled at least every second 746 * when events are pending. When a message is found the caller should 747 * poll until no more messages are present. However, this causes 748 * problems on some laptops where a suspend event notification is 749 * not cleared until it is acknowledged. 750 * 751 * Additional information is returned in the info pointer, providing 752 * that APM 1.2 is in use. If no messges are pending the value 0x80 753 * is returned (No power management events pending). 754 */ 755 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) 756 { 757 struct apm_bios_call call; 758 759 call.func = APM_FUNC_GET_EVENT; 760 call.ebx = call.ecx = 0; 761 762 if (apm_bios_call(&call)) 763 return call.err; 764 765 *event = call.ebx; 766 if (apm_info.connection_version < 0x0102) 767 *info = ~0; /* indicate info not valid */ 768 else 769 *info = call.ecx; 770 return APM_SUCCESS; 771 } 772 773 /** 774 * set_power_state - set the power management state 775 * @what: which items to transition 776 * @state: state to transition to 777 * 778 * Request an APM change of state for one or more system devices. The 779 * processor state must be transitioned last of all. what holds the 780 * class of device in the upper byte and the device number (0xFF for 781 * all) for the object to be transitioned. 782 * 783 * The state holds the state to transition to, which may in fact 784 * be an acceptance of a BIOS requested state change. 785 */ 786 787 static int set_power_state(u_short what, u_short state) 788 { 789 u32 eax; 790 int err; 791 792 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err)) 793 return err; 794 return APM_SUCCESS; 795 } 796 797 /** 798 * set_system_power_state - set system wide power state 799 * @state: which state to enter 800 * 801 * Transition the entire system into a new APM power state. 802 */ 803 804 static int set_system_power_state(u_short state) 805 { 806 return set_power_state(APM_DEVICE_ALL, state); 807 } 808 809 /** 810 * apm_do_idle - perform power saving 811 * 812 * This function notifies the BIOS that the processor is (in the view 813 * of the OS) idle. It returns -1 in the event that the BIOS refuses 814 * to handle the idle request. On a success the function returns 1 815 * if the BIOS did clock slowing or 0 otherwise. 816 */ 817 818 static int apm_do_idle(void) 819 { 820 u32 eax; 821 u8 ret = 0; 822 int idled = 0; 823 int polling; 824 int err = 0; 825 826 polling = !!(current_thread_info()->status & TS_POLLING); 827 if (polling) { 828 current_thread_info()->status &= ~TS_POLLING; 829 /* 830 * TS_POLLING-cleared state must be visible before we 831 * test NEED_RESCHED: 832 */ 833 smp_mb(); 834 } 835 if (!need_resched()) { 836 idled = 1; 837 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); 838 } 839 if (polling) 840 current_thread_info()->status |= TS_POLLING; 841 842 if (!idled) 843 return 0; 844 845 if (ret) { 846 static unsigned long t; 847 848 /* This always fails on some SMP boards running UP kernels. 849 * Only report the failure the first 5 times. 850 */ 851 if (++t < 5) { 852 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); 853 t = jiffies; 854 } 855 return -1; 856 } 857 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; 858 return clock_slowed; 859 } 860 861 /** 862 * apm_do_busy - inform the BIOS the CPU is busy 863 * 864 * Request that the BIOS brings the CPU back to full performance. 865 */ 866 867 static void apm_do_busy(void) 868 { 869 u32 dummy; 870 int err; 871 872 if (clock_slowed || ALWAYS_CALL_BUSY) { 873 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); 874 clock_slowed = 0; 875 } 876 } 877 878 /* 879 * If no process has really been interested in 880 * the CPU for some time, we want to call BIOS 881 * power management - we probably want 882 * to conserve power. 883 */ 884 #define IDLE_CALC_LIMIT (HZ * 100) 885 #define IDLE_LEAKY_MAX 16 886 887 static void (*original_pm_idle)(void) __read_mostly; 888 889 /** 890 * apm_cpu_idle - cpu idling for APM capable Linux 891 * 892 * This is the idling function the kernel executes when APM is available. It 893 * tries to do BIOS powermanagement based on the average system idle time. 894 * Furthermore it calls the system default idle routine. 895 */ 896 897 static void apm_cpu_idle(void) 898 { 899 static int use_apm_idle; /* = 0 */ 900 static unsigned int last_jiffies; /* = 0 */ 901 static unsigned int last_stime; /* = 0 */ 902 903 int apm_idle_done = 0; 904 unsigned int jiffies_since_last_check = jiffies - last_jiffies; 905 unsigned int bucket; 906 907 recalc: 908 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 909 use_apm_idle = 0; 910 last_jiffies = jiffies; 911 last_stime = current->stime; 912 } else if (jiffies_since_last_check > idle_period) { 913 unsigned int idle_percentage; 914 915 idle_percentage = current->stime - last_stime; 916 idle_percentage *= 100; 917 idle_percentage /= jiffies_since_last_check; 918 use_apm_idle = (idle_percentage > idle_threshold); 919 if (apm_info.forbid_idle) 920 use_apm_idle = 0; 921 last_jiffies = jiffies; 922 last_stime = current->stime; 923 } 924 925 bucket = IDLE_LEAKY_MAX; 926 927 while (!need_resched()) { 928 if (use_apm_idle) { 929 unsigned int t; 930 931 t = jiffies; 932 switch (apm_do_idle()) { 933 case 0: 934 apm_idle_done = 1; 935 if (t != jiffies) { 936 if (bucket) { 937 bucket = IDLE_LEAKY_MAX; 938 continue; 939 } 940 } else if (bucket) { 941 bucket--; 942 continue; 943 } 944 break; 945 case 1: 946 apm_idle_done = 1; 947 break; 948 default: /* BIOS refused */ 949 break; 950 } 951 } 952 if (original_pm_idle) 953 original_pm_idle(); 954 else 955 default_idle(); 956 local_irq_disable(); 957 jiffies_since_last_check = jiffies - last_jiffies; 958 if (jiffies_since_last_check > idle_period) 959 goto recalc; 960 } 961 962 if (apm_idle_done) 963 apm_do_busy(); 964 965 local_irq_enable(); 966 } 967 968 /** 969 * apm_power_off - ask the BIOS to power off 970 * 971 * Handle the power off sequence. This is the one piece of code we 972 * will execute even on SMP machines. In order to deal with BIOS 973 * bugs we support real mode APM BIOS power off calls. We also make 974 * the SMP call on CPU0 as some systems will only honour this call 975 * on their first cpu. 976 */ 977 978 static void apm_power_off(void) 979 { 980 /* Some bioses don't like being called from CPU != 0 */ 981 if (apm_info.realmode_power_off) { 982 set_cpus_allowed_ptr(current, cpumask_of(0)); 983 machine_real_restart(MRR_APM); 984 } else { 985 (void)set_system_power_state(APM_STATE_OFF); 986 } 987 } 988 989 #ifdef CONFIG_APM_DO_ENABLE 990 991 /** 992 * apm_enable_power_management - enable BIOS APM power management 993 * @enable: enable yes/no 994 * 995 * Enable or disable the APM BIOS power services. 996 */ 997 998 static int apm_enable_power_management(int enable) 999 { 1000 u32 eax; 1001 int err; 1002 1003 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 1004 return APM_NOT_ENGAGED; 1005 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 1006 enable, &eax, &err)) 1007 return err; 1008 if (enable) 1009 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 1010 else 1011 apm_info.bios.flags |= APM_BIOS_DISABLED; 1012 return APM_SUCCESS; 1013 } 1014 #endif 1015 1016 /** 1017 * apm_get_power_status - get current power state 1018 * @status: returned status 1019 * @bat: battery info 1020 * @life: estimated life 1021 * 1022 * Obtain the current power status from the APM BIOS. We return a 1023 * status which gives the rough battery status, and current power 1024 * source. The bat value returned give an estimate as a percentage 1025 * of life and a status value for the battery. The estimated life 1026 * if reported is a lifetime in secodnds/minutes at current powwer 1027 * consumption. 1028 */ 1029 1030 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 1031 { 1032 struct apm_bios_call call; 1033 1034 call.func = APM_FUNC_GET_STATUS; 1035 call.ebx = APM_DEVICE_ALL; 1036 call.ecx = 0; 1037 1038 if (apm_info.get_power_status_broken) 1039 return APM_32_UNSUPPORTED; 1040 if (apm_bios_call(&call)) 1041 return call.err; 1042 *status = call.ebx; 1043 *bat = call.ecx; 1044 if (apm_info.get_power_status_swabinminutes) { 1045 *life = swab16((u16)call.edx); 1046 *life |= 0x8000; 1047 } else 1048 *life = call.edx; 1049 return APM_SUCCESS; 1050 } 1051 1052 #if 0 1053 static int apm_get_battery_status(u_short which, u_short *status, 1054 u_short *bat, u_short *life, u_short *nbat) 1055 { 1056 u32 eax; 1057 u32 ebx; 1058 u32 ecx; 1059 u32 edx; 1060 u32 esi; 1061 1062 if (apm_info.connection_version < 0x0102) { 1063 /* pretend we only have one battery. */ 1064 if (which != 1) 1065 return APM_BAD_DEVICE; 1066 *nbat = 1; 1067 return apm_get_power_status(status, bat, life); 1068 } 1069 1070 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1071 &ebx, &ecx, &edx, &esi)) 1072 return (eax >> 8) & 0xff; 1073 *status = ebx; 1074 *bat = ecx; 1075 *life = edx; 1076 *nbat = esi; 1077 return APM_SUCCESS; 1078 } 1079 #endif 1080 1081 /** 1082 * apm_engage_power_management - enable PM on a device 1083 * @device: identity of device 1084 * @enable: on/off 1085 * 1086 * Activate or deactive power management on either a specific device 1087 * or the entire system (%APM_DEVICE_ALL). 1088 */ 1089 1090 static int apm_engage_power_management(u_short device, int enable) 1091 { 1092 u32 eax; 1093 int err; 1094 1095 if ((enable == 0) && (device == APM_DEVICE_ALL) 1096 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1097 return APM_DISABLED; 1098 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, 1099 &eax, &err)) 1100 return err; 1101 if (device == APM_DEVICE_ALL) { 1102 if (enable) 1103 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1104 else 1105 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1106 } 1107 return APM_SUCCESS; 1108 } 1109 1110 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1111 1112 /** 1113 * apm_console_blank - blank the display 1114 * @blank: on/off 1115 * 1116 * Attempt to blank the console, firstly by blanking just video device 1117 * zero, and if that fails (some BIOSes don't support it) then it blanks 1118 * all video devices. Typically the BIOS will do laptop backlight and 1119 * monitor powerdown for us. 1120 */ 1121 1122 static int apm_console_blank(int blank) 1123 { 1124 int error = APM_NOT_ENGAGED; /* silence gcc */ 1125 int i; 1126 u_short state; 1127 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1128 1129 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1130 1131 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1132 error = set_power_state(dev[i], state); 1133 1134 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1135 return 1; 1136 1137 if (error == APM_NOT_ENGAGED) 1138 break; 1139 } 1140 1141 if (error == APM_NOT_ENGAGED) { 1142 static int tried; 1143 int eng_error; 1144 if (tried++ == 0) { 1145 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1146 if (eng_error) { 1147 apm_error("set display", error); 1148 apm_error("engage interface", eng_error); 1149 return 0; 1150 } else 1151 return apm_console_blank(blank); 1152 } 1153 } 1154 apm_error("set display", error); 1155 return 0; 1156 } 1157 #endif 1158 1159 static int queue_empty(struct apm_user *as) 1160 { 1161 return as->event_head == as->event_tail; 1162 } 1163 1164 static apm_event_t get_queued_event(struct apm_user *as) 1165 { 1166 if (++as->event_tail >= APM_MAX_EVENTS) 1167 as->event_tail = 0; 1168 return as->events[as->event_tail]; 1169 } 1170 1171 static void queue_event(apm_event_t event, struct apm_user *sender) 1172 { 1173 struct apm_user *as; 1174 1175 spin_lock(&user_list_lock); 1176 if (user_list == NULL) 1177 goto out; 1178 for (as = user_list; as != NULL; as = as->next) { 1179 if ((as == sender) || (!as->reader)) 1180 continue; 1181 if (++as->event_head >= APM_MAX_EVENTS) 1182 as->event_head = 0; 1183 1184 if (as->event_head == as->event_tail) { 1185 static int notified; 1186 1187 if (notified++ == 0) 1188 printk(KERN_ERR "apm: an event queue overflowed\n"); 1189 if (++as->event_tail >= APM_MAX_EVENTS) 1190 as->event_tail = 0; 1191 } 1192 as->events[as->event_head] = event; 1193 if (!as->suser || !as->writer) 1194 continue; 1195 switch (event) { 1196 case APM_SYS_SUSPEND: 1197 case APM_USER_SUSPEND: 1198 as->suspends_pending++; 1199 suspends_pending++; 1200 break; 1201 1202 case APM_SYS_STANDBY: 1203 case APM_USER_STANDBY: 1204 as->standbys_pending++; 1205 standbys_pending++; 1206 break; 1207 } 1208 } 1209 wake_up_interruptible(&apm_waitqueue); 1210 out: 1211 spin_unlock(&user_list_lock); 1212 } 1213 1214 static void reinit_timer(void) 1215 { 1216 #ifdef INIT_TIMER_AFTER_SUSPEND 1217 unsigned long flags; 1218 1219 raw_spin_lock_irqsave(&i8253_lock, flags); 1220 /* set the clock to HZ */ 1221 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1222 udelay(10); 1223 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */ 1224 udelay(10); 1225 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */ 1226 udelay(10); 1227 raw_spin_unlock_irqrestore(&i8253_lock, flags); 1228 #endif 1229 } 1230 1231 static int suspend(int vetoable) 1232 { 1233 int err; 1234 struct apm_user *as; 1235 1236 dpm_suspend_start(PMSG_SUSPEND); 1237 1238 dpm_suspend_noirq(PMSG_SUSPEND); 1239 1240 local_irq_disable(); 1241 sysdev_suspend(PMSG_SUSPEND); 1242 syscore_suspend(); 1243 1244 local_irq_enable(); 1245 1246 save_processor_state(); 1247 err = set_system_power_state(APM_STATE_SUSPEND); 1248 ignore_normal_resume = 1; 1249 restore_processor_state(); 1250 1251 local_irq_disable(); 1252 reinit_timer(); 1253 1254 if (err == APM_NO_ERROR) 1255 err = APM_SUCCESS; 1256 if (err != APM_SUCCESS) 1257 apm_error("suspend", err); 1258 err = (err == APM_SUCCESS) ? 0 : -EIO; 1259 1260 syscore_resume(); 1261 sysdev_resume(); 1262 local_irq_enable(); 1263 1264 dpm_resume_noirq(PMSG_RESUME); 1265 1266 dpm_resume_end(PMSG_RESUME); 1267 queue_event(APM_NORMAL_RESUME, NULL); 1268 spin_lock(&user_list_lock); 1269 for (as = user_list; as != NULL; as = as->next) { 1270 as->suspend_wait = 0; 1271 as->suspend_result = err; 1272 } 1273 spin_unlock(&user_list_lock); 1274 wake_up_interruptible(&apm_suspend_waitqueue); 1275 return err; 1276 } 1277 1278 static void standby(void) 1279 { 1280 int err; 1281 1282 dpm_suspend_noirq(PMSG_SUSPEND); 1283 1284 local_irq_disable(); 1285 sysdev_suspend(PMSG_SUSPEND); 1286 syscore_suspend(); 1287 local_irq_enable(); 1288 1289 err = set_system_power_state(APM_STATE_STANDBY); 1290 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1291 apm_error("standby", err); 1292 1293 local_irq_disable(); 1294 syscore_resume(); 1295 sysdev_resume(); 1296 local_irq_enable(); 1297 1298 dpm_resume_noirq(PMSG_RESUME); 1299 } 1300 1301 static 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 1320 static 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 1409 static 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 1433 static 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 1453 static int check_apm_user(struct apm_user *as, const char *func) 1454 { 1455 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1456 printk(KERN_ERR "apm: %s passed bad filp\n", func); 1457 return 1; 1458 } 1459 return 0; 1460 } 1461 1462 static 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 1505 static 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 1518 static 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 1566 static 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 printk(KERN_ERR "apm: 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 1604 static 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 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", 1611 sizeof(*as)); 1612 return -ENOMEM; 1613 } 1614 as->magic = APM_BIOS_MAGIC; 1615 as->event_tail = as->event_head = 0; 1616 as->suspends_pending = as->standbys_pending = 0; 1617 as->suspends_read = as->standbys_read = 0; 1618 /* 1619 * XXX - this is a tiny bit broken, when we consider BSD 1620 * process accounting. If the device is opened by root, we 1621 * instantly flag that we used superuser privs. Who knows, 1622 * we might close the device immediately without doing a 1623 * privileged operation -- cevans 1624 */ 1625 as->suser = capable(CAP_SYS_ADMIN); 1626 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1627 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1628 spin_lock(&user_list_lock); 1629 as->next = user_list; 1630 user_list = as; 1631 spin_unlock(&user_list_lock); 1632 filp->private_data = as; 1633 return 0; 1634 } 1635 1636 static int proc_apm_show(struct seq_file *m, void *v) 1637 { 1638 unsigned short bx; 1639 unsigned short cx; 1640 unsigned short dx; 1641 int error; 1642 unsigned short ac_line_status = 0xff; 1643 unsigned short battery_status = 0xff; 1644 unsigned short battery_flag = 0xff; 1645 int percentage = -1; 1646 int time_units = -1; 1647 char *units = "?"; 1648 1649 if ((num_online_cpus() == 1) && 1650 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1651 ac_line_status = (bx >> 8) & 0xff; 1652 battery_status = bx & 0xff; 1653 if ((cx & 0xff) != 0xff) 1654 percentage = cx & 0xff; 1655 1656 if (apm_info.connection_version > 0x100) { 1657 battery_flag = (cx >> 8) & 0xff; 1658 if (dx != 0xffff) { 1659 units = (dx & 0x8000) ? "min" : "sec"; 1660 time_units = dx & 0x7fff; 1661 } 1662 } 1663 } 1664 /* Arguments, with symbols from linux/apm_bios.h. Information is 1665 from the Get Power Status (0x0a) call unless otherwise noted. 1666 1667 0) Linux driver version (this will change if format changes) 1668 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1669 2) APM flags from APM Installation Check (0x00): 1670 bit 0: APM_16_BIT_SUPPORT 1671 bit 1: APM_32_BIT_SUPPORT 1672 bit 2: APM_IDLE_SLOWS_CLOCK 1673 bit 3: APM_BIOS_DISABLED 1674 bit 4: APM_BIOS_DISENGAGED 1675 3) AC line status 1676 0x00: Off-line 1677 0x01: On-line 1678 0x02: On backup power (BIOS >= 1.1 only) 1679 0xff: Unknown 1680 4) Battery status 1681 0x00: High 1682 0x01: Low 1683 0x02: Critical 1684 0x03: Charging 1685 0x04: Selected battery not present (BIOS >= 1.2 only) 1686 0xff: Unknown 1687 5) Battery flag 1688 bit 0: High 1689 bit 1: Low 1690 bit 2: Critical 1691 bit 3: Charging 1692 bit 7: No system battery 1693 0xff: Unknown 1694 6) Remaining battery life (percentage of charge): 1695 0-100: valid 1696 -1: Unknown 1697 7) Remaining battery life (time units): 1698 Number of remaining minutes or seconds 1699 -1: Unknown 1700 8) min = minutes; sec = seconds */ 1701 1702 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1703 driver_version, 1704 (apm_info.bios.version >> 8) & 0xff, 1705 apm_info.bios.version & 0xff, 1706 apm_info.bios.flags, 1707 ac_line_status, 1708 battery_status, 1709 battery_flag, 1710 percentage, 1711 time_units, 1712 units); 1713 return 0; 1714 } 1715 1716 static int proc_apm_open(struct inode *inode, struct file *file) 1717 { 1718 return single_open(file, proc_apm_show, NULL); 1719 } 1720 1721 static const struct file_operations apm_file_ops = { 1722 .owner = THIS_MODULE, 1723 .open = proc_apm_open, 1724 .read = seq_read, 1725 .llseek = seq_lseek, 1726 .release = single_release, 1727 }; 1728 1729 static int apm(void *unused) 1730 { 1731 unsigned short bx; 1732 unsigned short cx; 1733 unsigned short dx; 1734 int error; 1735 char *power_stat; 1736 char *bat_stat; 1737 1738 /* 2002/08/01 - WT 1739 * This is to avoid random crashes at boot time during initialization 1740 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1741 * Some bioses don't like being called from CPU != 0. 1742 * Method suggested by Ingo Molnar. 1743 */ 1744 set_cpus_allowed_ptr(current, cpumask_of(0)); 1745 BUG_ON(smp_processor_id() != 0); 1746 1747 if (apm_info.connection_version == 0) { 1748 apm_info.connection_version = apm_info.bios.version; 1749 if (apm_info.connection_version > 0x100) { 1750 /* 1751 * We only support BIOSs up to version 1.2 1752 */ 1753 if (apm_info.connection_version > 0x0102) 1754 apm_info.connection_version = 0x0102; 1755 error = apm_driver_version(&apm_info.connection_version); 1756 if (error != APM_SUCCESS) { 1757 apm_error("driver version", error); 1758 /* Fall back to an APM 1.0 connection. */ 1759 apm_info.connection_version = 0x100; 1760 } 1761 } 1762 } 1763 1764 if (debug) 1765 printk(KERN_INFO "apm: Connection version %d.%d\n", 1766 (apm_info.connection_version >> 8) & 0xff, 1767 apm_info.connection_version & 0xff); 1768 1769 #ifdef CONFIG_APM_DO_ENABLE 1770 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1771 /* 1772 * This call causes my NEC UltraLite Versa 33/C to hang if it 1773 * is booted with PM disabled but not in the docking station. 1774 * Unfortunate ... 1775 */ 1776 error = apm_enable_power_management(1); 1777 if (error) { 1778 apm_error("enable power management", error); 1779 return -1; 1780 } 1781 } 1782 #endif 1783 1784 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1785 && (apm_info.connection_version > 0x0100)) { 1786 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1787 if (error) { 1788 apm_error("engage power management", error); 1789 return -1; 1790 } 1791 } 1792 1793 if (debug && (num_online_cpus() == 1 || smp)) { 1794 error = apm_get_power_status(&bx, &cx, &dx); 1795 if (error) 1796 printk(KERN_INFO "apm: power status not available\n"); 1797 else { 1798 switch ((bx >> 8) & 0xff) { 1799 case 0: 1800 power_stat = "off line"; 1801 break; 1802 case 1: 1803 power_stat = "on line"; 1804 break; 1805 case 2: 1806 power_stat = "on backup power"; 1807 break; 1808 default: 1809 power_stat = "unknown"; 1810 break; 1811 } 1812 switch (bx & 0xff) { 1813 case 0: 1814 bat_stat = "high"; 1815 break; 1816 case 1: 1817 bat_stat = "low"; 1818 break; 1819 case 2: 1820 bat_stat = "critical"; 1821 break; 1822 case 3: 1823 bat_stat = "charging"; 1824 break; 1825 default: 1826 bat_stat = "unknown"; 1827 break; 1828 } 1829 printk(KERN_INFO 1830 "apm: AC %s, battery status %s, battery life ", 1831 power_stat, bat_stat); 1832 if ((cx & 0xff) == 0xff) 1833 printk("unknown\n"); 1834 else 1835 printk("%d%%\n", cx & 0xff); 1836 if (apm_info.connection_version > 0x100) { 1837 printk(KERN_INFO 1838 "apm: battery flag 0x%02x, battery life ", 1839 (cx >> 8) & 0xff); 1840 if (dx == 0xffff) 1841 printk("unknown\n"); 1842 else 1843 printk("%d %s\n", dx & 0x7fff, 1844 (dx & 0x8000) ? 1845 "minutes" : "seconds"); 1846 } 1847 } 1848 } 1849 1850 /* Install our power off handler.. */ 1851 if (power_off) 1852 pm_power_off = apm_power_off; 1853 1854 if (num_online_cpus() == 1 || smp) { 1855 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1856 console_blank_hook = apm_console_blank; 1857 #endif 1858 apm_mainloop(); 1859 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1860 console_blank_hook = NULL; 1861 #endif 1862 } 1863 1864 return 0; 1865 } 1866 1867 #ifndef MODULE 1868 static int __init apm_setup(char *str) 1869 { 1870 int invert; 1871 1872 while ((str != NULL) && (*str != '\0')) { 1873 if (strncmp(str, "off", 3) == 0) 1874 apm_disabled = 1; 1875 if (strncmp(str, "on", 2) == 0) 1876 apm_disabled = 0; 1877 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1878 (strncmp(str, "bounce_interval=", 16) == 0)) 1879 bounce_interval = simple_strtol(str + 16, NULL, 0); 1880 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1881 (strncmp(str, "idle_threshold=", 15) == 0)) 1882 idle_threshold = simple_strtol(str + 15, NULL, 0); 1883 if ((strncmp(str, "idle-period=", 12) == 0) || 1884 (strncmp(str, "idle_period=", 12) == 0)) 1885 idle_period = simple_strtol(str + 12, NULL, 0); 1886 invert = (strncmp(str, "no-", 3) == 0) || 1887 (strncmp(str, "no_", 3) == 0); 1888 if (invert) 1889 str += 3; 1890 if (strncmp(str, "debug", 5) == 0) 1891 debug = !invert; 1892 if ((strncmp(str, "power-off", 9) == 0) || 1893 (strncmp(str, "power_off", 9) == 0)) 1894 power_off = !invert; 1895 if (strncmp(str, "smp", 3) == 0) { 1896 smp = !invert; 1897 idle_threshold = 100; 1898 } 1899 if ((strncmp(str, "allow-ints", 10) == 0) || 1900 (strncmp(str, "allow_ints", 10) == 0)) 1901 apm_info.allow_ints = !invert; 1902 if ((strncmp(str, "broken-psr", 10) == 0) || 1903 (strncmp(str, "broken_psr", 10) == 0)) 1904 apm_info.get_power_status_broken = !invert; 1905 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1906 (strncmp(str, "realmode_power_off", 18) == 0)) 1907 apm_info.realmode_power_off = !invert; 1908 str = strchr(str, ','); 1909 if (str != NULL) 1910 str += strspn(str, ", \t"); 1911 } 1912 return 1; 1913 } 1914 1915 __setup("apm=", apm_setup); 1916 #endif 1917 1918 static const struct file_operations apm_bios_fops = { 1919 .owner = THIS_MODULE, 1920 .read = do_read, 1921 .poll = do_poll, 1922 .unlocked_ioctl = do_ioctl, 1923 .open = do_open, 1924 .release = do_release, 1925 .llseek = noop_llseek, 1926 }; 1927 1928 static struct miscdevice apm_device = { 1929 APM_MINOR_DEV, 1930 "apm_bios", 1931 &apm_bios_fops 1932 }; 1933 1934 1935 /* Simple "print if true" callback */ 1936 static int __init print_if_true(const struct dmi_system_id *d) 1937 { 1938 printk("%s\n", d->ident); 1939 return 0; 1940 } 1941 1942 /* 1943 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1944 * disabled before the suspend. Linux used to get terribly confused by that. 1945 */ 1946 static int __init broken_ps2_resume(const struct dmi_system_id *d) 1947 { 1948 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1949 "workaround hopefully not needed.\n", d->ident); 1950 return 0; 1951 } 1952 1953 /* Some bioses have a broken protected mode poweroff and need to use realmode */ 1954 static int __init set_realmode_power_off(const struct dmi_system_id *d) 1955 { 1956 if (apm_info.realmode_power_off == 0) { 1957 apm_info.realmode_power_off = 1; 1958 printk(KERN_INFO "%s bios detected. " 1959 "Using realmode poweroff only.\n", d->ident); 1960 } 1961 return 0; 1962 } 1963 1964 /* Some laptops require interrupts to be enabled during APM calls */ 1965 static int __init set_apm_ints(const struct dmi_system_id *d) 1966 { 1967 if (apm_info.allow_ints == 0) { 1968 apm_info.allow_ints = 1; 1969 printk(KERN_INFO "%s machine detected. " 1970 "Enabling interrupts during APM calls.\n", d->ident); 1971 } 1972 return 0; 1973 } 1974 1975 /* Some APM bioses corrupt memory or just plain do not work */ 1976 static int __init apm_is_horked(const struct dmi_system_id *d) 1977 { 1978 if (apm_info.disabled == 0) { 1979 apm_info.disabled = 1; 1980 printk(KERN_INFO "%s machine detected. " 1981 "Disabling APM.\n", d->ident); 1982 } 1983 return 0; 1984 } 1985 1986 static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1987 { 1988 if (apm_info.disabled == 0) { 1989 apm_info.disabled = 1; 1990 printk(KERN_INFO "%s machine detected. " 1991 "Disabling APM.\n", d->ident); 1992 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); 1993 printk(KERN_INFO "download from support.intel.com\n"); 1994 } 1995 return 0; 1996 } 1997 1998 /* Some APM bioses hang on APM idle calls */ 1999 static int __init apm_likes_to_melt(const struct dmi_system_id *d) 2000 { 2001 if (apm_info.forbid_idle == 0) { 2002 apm_info.forbid_idle = 1; 2003 printk(KERN_INFO "%s machine detected. " 2004 "Disabling APM idle calls.\n", d->ident); 2005 } 2006 return 0; 2007 } 2008 2009 /* 2010 * Check for clue free BIOS implementations who use 2011 * the following QA technique 2012 * 2013 * [ Write BIOS Code ]<------ 2014 * | ^ 2015 * < Does it Compile >----N-- 2016 * |Y ^ 2017 * < Does it Boot Win98 >-N-- 2018 * |Y 2019 * [Ship It] 2020 * 2021 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 2022 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 2023 */ 2024 static int __init broken_apm_power(const struct dmi_system_id *d) 2025 { 2026 apm_info.get_power_status_broken = 1; 2027 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 2028 "disabling power status reporting.\n"); 2029 return 0; 2030 } 2031 2032 /* 2033 * This bios swaps the APM minute reporting bytes over (Many sony laptops 2034 * have this problem). 2035 */ 2036 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 2037 { 2038 apm_info.get_power_status_swabinminutes = 1; 2039 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 2040 "in minutes and wrong byte order.\n"); 2041 return 0; 2042 } 2043 2044 static struct dmi_system_id __initdata apm_dmi_table[] = { 2045 { 2046 print_if_true, 2047 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2048 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2049 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2050 }, 2051 { /* Handle problems with APM on the C600 */ 2052 broken_ps2_resume, "Dell Latitude C600", 2053 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2054 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2055 }, 2056 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2057 set_apm_ints, "Dell Latitude", 2058 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2059 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2060 }, 2061 { /* APM crashes */ 2062 apm_is_horked, "Dell Inspiron 2500", 2063 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2064 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2065 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2066 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2067 }, 2068 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2069 set_apm_ints, "Dell Inspiron", { 2070 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2071 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2072 }, 2073 { /* Handle problems with APM on Inspiron 5000e */ 2074 broken_apm_power, "Dell Inspiron 5000e", 2075 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2076 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2077 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2078 }, 2079 { /* Handle problems with APM on Inspiron 2500 */ 2080 broken_apm_power, "Dell Inspiron 2500", 2081 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2082 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2083 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2084 }, 2085 { /* APM crashes */ 2086 apm_is_horked, "Dell Dimension 4100", 2087 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2088 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2089 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2090 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2091 }, 2092 { /* Allow interrupts during suspend on Compaq Laptops*/ 2093 set_apm_ints, "Compaq 12XL125", 2094 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2095 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2096 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2097 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2098 }, 2099 { /* Allow interrupts during APM or the clock goes slow */ 2100 set_apm_ints, "ASUSTeK", 2101 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2102 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2103 }, 2104 { /* APM blows on shutdown */ 2105 apm_is_horked, "ABIT KX7-333[R]", 2106 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2107 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2108 }, 2109 { /* APM crashes */ 2110 apm_is_horked, "Trigem Delhi3", 2111 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2112 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2113 }, 2114 { /* APM crashes */ 2115 apm_is_horked, "Fujitsu-Siemens", 2116 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2117 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2118 }, 2119 { /* APM crashes */ 2120 apm_is_horked_d850md, "Intel D850MD", 2121 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2122 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2123 }, 2124 { /* APM crashes */ 2125 apm_is_horked, "Intel D810EMO", 2126 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2127 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2128 }, 2129 { /* APM crashes */ 2130 apm_is_horked, "Dell XPS-Z", 2131 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2132 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2133 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2134 }, 2135 { /* APM crashes */ 2136 apm_is_horked, "Sharp PC-PJ/AX", 2137 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2138 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2139 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2140 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2141 }, 2142 { /* APM crashes */ 2143 apm_is_horked, "Dell Inspiron 2500", 2144 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2145 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2146 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2147 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2148 }, 2149 { /* APM idle hangs */ 2150 apm_likes_to_melt, "Jabil AMD", 2151 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2152 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2153 }, 2154 { /* APM idle hangs */ 2155 apm_likes_to_melt, "AMI Bios", 2156 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2157 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2158 }, 2159 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2160 swab_apm_power_in_minutes, "Sony VAIO", 2161 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2162 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2163 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2164 }, 2165 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2166 swab_apm_power_in_minutes, "Sony VAIO", 2167 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2168 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2169 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2170 }, 2171 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2172 swab_apm_power_in_minutes, "Sony VAIO", 2173 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2174 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2175 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2176 }, 2177 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2178 swab_apm_power_in_minutes, "Sony VAIO", 2179 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2180 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2181 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2182 }, 2183 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2184 swab_apm_power_in_minutes, "Sony VAIO", 2185 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2186 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2187 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2188 }, 2189 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2190 swab_apm_power_in_minutes, "Sony VAIO", 2191 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2192 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2193 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2194 }, 2195 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2196 swab_apm_power_in_minutes, "Sony VAIO", 2197 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2198 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2199 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2200 }, 2201 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2202 swab_apm_power_in_minutes, "Sony VAIO", 2203 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2204 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2205 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2206 }, 2207 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2208 swab_apm_power_in_minutes, "Sony VAIO", 2209 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2210 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2211 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2212 }, 2213 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2214 swab_apm_power_in_minutes, "Sony VAIO", 2215 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2216 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2217 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2218 }, 2219 2220 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2221 swab_apm_power_in_minutes, "Sony VAIO", 2222 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2223 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2224 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2225 }, 2226 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2227 swab_apm_power_in_minutes, "Sony VAIO", 2228 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2229 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2230 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2231 }, 2232 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2233 swab_apm_power_in_minutes, "Sony VAIO", 2234 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2235 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2236 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2237 }, 2238 { /* broken PM poweroff bios */ 2239 set_realmode_power_off, "Award Software v4.60 PGMA", 2240 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2241 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2242 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2243 }, 2244 2245 /* Generic per vendor APM settings */ 2246 2247 { /* Allow interrupts during suspend on IBM laptops */ 2248 set_apm_ints, "IBM", 2249 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2250 }, 2251 2252 { } 2253 }; 2254 2255 /* 2256 * Just start the APM thread. We do NOT want to do APM BIOS 2257 * calls from anything but the APM thread, if for no other reason 2258 * than the fact that we don't trust the APM BIOS. This way, 2259 * most common APM BIOS problems that lead to protection errors 2260 * etc will have at least some level of being contained... 2261 * 2262 * In short, if something bad happens, at least we have a choice 2263 * of just killing the apm thread.. 2264 */ 2265 static int __init apm_init(void) 2266 { 2267 struct desc_struct *gdt; 2268 int err; 2269 2270 dmi_check_system(apm_dmi_table); 2271 2272 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { 2273 printk(KERN_INFO "apm: BIOS not found.\n"); 2274 return -ENODEV; 2275 } 2276 printk(KERN_INFO 2277 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2278 ((apm_info.bios.version >> 8) & 0xff), 2279 (apm_info.bios.version & 0xff), 2280 apm_info.bios.flags, 2281 driver_version); 2282 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2283 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2284 return -ENODEV; 2285 } 2286 2287 if (allow_ints) 2288 apm_info.allow_ints = 1; 2289 if (broken_psr) 2290 apm_info.get_power_status_broken = 1; 2291 if (realmode_power_off) 2292 apm_info.realmode_power_off = 1; 2293 /* User can override, but default is to trust DMI */ 2294 if (apm_disabled != -1) 2295 apm_info.disabled = apm_disabled; 2296 2297 /* 2298 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2299 * but is reportedly a 1.0 BIOS. 2300 */ 2301 if (apm_info.bios.version == 0x001) 2302 apm_info.bios.version = 0x100; 2303 2304 /* BIOS < 1.2 doesn't set cseg_16_len */ 2305 if (apm_info.bios.version < 0x102) 2306 apm_info.bios.cseg_16_len = 0; /* 64k */ 2307 2308 if (debug) { 2309 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2310 apm_info.bios.cseg, apm_info.bios.offset, 2311 apm_info.bios.cseg_16, apm_info.bios.dseg); 2312 if (apm_info.bios.version > 0x100) 2313 printk(" cseg len %x, dseg len %x", 2314 apm_info.bios.cseg_len, 2315 apm_info.bios.dseg_len); 2316 if (apm_info.bios.version > 0x101) 2317 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2318 printk("\n"); 2319 } 2320 2321 if (apm_info.disabled) { 2322 printk(KERN_NOTICE "apm: disabled on user request.\n"); 2323 return -ENODEV; 2324 } 2325 if ((num_online_cpus() > 1) && !power_off && !smp) { 2326 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n"); 2327 apm_info.disabled = 1; 2328 return -ENODEV; 2329 } 2330 if (!acpi_disabled) { 2331 printk(KERN_NOTICE "apm: overridden by ACPI.\n"); 2332 apm_info.disabled = 1; 2333 return -ENODEV; 2334 } 2335 2336 /* 2337 * Set up the long jump entry point to the APM BIOS, which is called 2338 * from inline assembly. 2339 */ 2340 apm_bios_entry.offset = apm_info.bios.offset; 2341 apm_bios_entry.segment = APM_CS; 2342 2343 /* 2344 * The APM 1.1 BIOS is supposed to provide limit information that it 2345 * recognizes. Many machines do this correctly, but many others do 2346 * not restrict themselves to their claimed limit. When this happens, 2347 * they will cause a segmentation violation in the kernel at boot time. 2348 * Most BIOS's, however, will respect a 64k limit, so we use that. 2349 * 2350 * Note we only set APM segments on CPU zero, since we pin the APM 2351 * code to that CPU. 2352 */ 2353 gdt = get_cpu_gdt_table(0); 2354 set_desc_base(&gdt[APM_CS >> 3], 2355 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); 2356 set_desc_base(&gdt[APM_CS_16 >> 3], 2357 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); 2358 set_desc_base(&gdt[APM_DS >> 3], 2359 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); 2360 2361 proc_create("apm", 0, NULL, &apm_file_ops); 2362 2363 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2364 if (IS_ERR(kapmd_task)) { 2365 printk(KERN_ERR "apm: disabled - Unable to start kernel " 2366 "thread.\n"); 2367 err = PTR_ERR(kapmd_task); 2368 kapmd_task = NULL; 2369 remove_proc_entry("apm", NULL); 2370 return err; 2371 } 2372 wake_up_process(kapmd_task); 2373 2374 if (num_online_cpus() > 1 && !smp) { 2375 printk(KERN_NOTICE 2376 "apm: disabled - APM is not SMP safe (power off active).\n"); 2377 return 0; 2378 } 2379 2380 /* 2381 * Note we don't actually care if the misc_device cannot be registered. 2382 * this driver can do its job without it, even if userspace can't 2383 * control it. just log the error 2384 */ 2385 if (misc_register(&apm_device)) 2386 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2387 2388 if (HZ != 100) 2389 idle_period = (idle_period * HZ) / 100; 2390 if (idle_threshold < 100) { 2391 original_pm_idle = pm_idle; 2392 pm_idle = apm_cpu_idle; 2393 set_pm_idle = 1; 2394 } 2395 2396 return 0; 2397 } 2398 2399 static void __exit apm_exit(void) 2400 { 2401 int error; 2402 2403 if (set_pm_idle) { 2404 pm_idle = original_pm_idle; 2405 /* 2406 * We are about to unload the current idle thread pm callback 2407 * (pm_idle), Wait for all processors to update cached/local 2408 * copies of pm_idle before proceeding. 2409 */ 2410 cpu_idle_wait(); 2411 } 2412 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) 2413 && (apm_info.connection_version > 0x0100)) { 2414 error = apm_engage_power_management(APM_DEVICE_ALL, 0); 2415 if (error) 2416 apm_error("disengage power management", error); 2417 } 2418 misc_deregister(&apm_device); 2419 remove_proc_entry("apm", NULL); 2420 if (power_off) 2421 pm_power_off = NULL; 2422 if (kapmd_task) { 2423 kthread_stop(kapmd_task); 2424 kapmd_task = NULL; 2425 } 2426 } 2427 2428 module_init(apm_init); 2429 module_exit(apm_exit); 2430 2431 MODULE_AUTHOR("Stephen Rothwell"); 2432 MODULE_DESCRIPTION("Advanced Power Management"); 2433 MODULE_LICENSE("GPL"); 2434 module_param(debug, bool, 0644); 2435 MODULE_PARM_DESC(debug, "Enable debug mode"); 2436 module_param(power_off, bool, 0444); 2437 MODULE_PARM_DESC(power_off, "Enable power off"); 2438 module_param(bounce_interval, int, 0444); 2439 MODULE_PARM_DESC(bounce_interval, 2440 "Set the number of ticks to ignore suspend bounces"); 2441 module_param(allow_ints, bool, 0444); 2442 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2443 module_param(broken_psr, bool, 0444); 2444 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2445 module_param(realmode_power_off, bool, 0444); 2446 MODULE_PARM_DESC(realmode_power_off, 2447 "Switch to real mode before powering off"); 2448 module_param(idle_threshold, int, 0444); 2449 MODULE_PARM_DESC(idle_threshold, 2450 "System idle percentage above which to make APM BIOS idle calls"); 2451 module_param(idle_period, int, 0444); 2452 MODULE_PARM_DESC(idle_period, 2453 "Period (in sec/100) over which to caculate the idle percentage"); 2454 module_param(smp, bool, 0444); 2455 MODULE_PARM_DESC(smp, 2456 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2457 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2458