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 complier/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@suse.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 via anonymous ftp from 193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. 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/smp_lock.h> 208 #include <linux/types.h> 209 #include <linux/stddef.h> 210 #include <linux/timer.h> 211 #include <linux/fcntl.h> 212 #include <linux/slab.h> 213 #include <linux/stat.h> 214 #include <linux/proc_fs.h> 215 #include <linux/seq_file.h> 216 #include <linux/miscdevice.h> 217 #include <linux/apm_bios.h> 218 #include <linux/init.h> 219 #include <linux/time.h> 220 #include <linux/sched.h> 221 #include <linux/pm.h> 222 #include <linux/capability.h> 223 #include <linux/device.h> 224 #include <linux/kernel.h> 225 #include <linux/freezer.h> 226 #include <linux/smp.h> 227 #include <linux/dmi.h> 228 #include <linux/suspend.h> 229 #include <linux/kthread.h> 230 #include <linux/jiffies.h> 231 232 #include <asm/system.h> 233 #include <asm/uaccess.h> 234 #include <asm/desc.h> 235 #include <asm/i8253.h> 236 #include <asm/olpc.h> 237 #include <asm/paravirt.h> 238 #include <asm/reboot.h> 239 240 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 241 extern int (*console_blank_hook)(int); 242 #endif 243 244 /* 245 * The apm_bios device is one of the misc char devices. 246 * This is its minor number. 247 */ 248 #define APM_MINOR_DEV 134 249 250 /* 251 * See Documentation/Config.help for the configuration options. 252 * 253 * Various options can be changed at boot time as follows: 254 * (We allow underscores for compatibility with the modules code) 255 * apm=on/off enable/disable APM 256 * [no-]allow[-_]ints allow interrupts during BIOS calls 257 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call 258 * [no-]realmode[-_]power[-_]off switch to real mode before 259 * powering off 260 * [no-]debug log some debugging messages 261 * [no-]power[-_]off power off on shutdown 262 * [no-]smp Use apm even on an SMP box 263 * bounce[-_]interval=<n> number of ticks to ignore suspend 264 * bounces 265 * idle[-_]threshold=<n> System idle percentage above which to 266 * make APM BIOS idle calls. Set it to 267 * 100 to disable. 268 * idle[-_]period=<n> Period (in 1/100s of a second) over 269 * which the idle percentage is 270 * calculated. 271 */ 272 273 /* KNOWN PROBLEM MACHINES: 274 * 275 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant 276 * [Confirmed by TI representative] 277 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification 278 * [Confirmed by BIOS disassembly] 279 * [This may work now ...] 280 * P: Toshiba 1950S: battery life information only gets updated after resume 281 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking 282 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] 283 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP 284 * Neale Banks <neale@lowendale.com.au> December 2000 285 * 286 * Legend: U = unusable with APM patches 287 * P = partially usable with APM patches 288 */ 289 290 /* 291 * Define as 1 to make the driver always call the APM BIOS busy 292 * routine even if the clock was not reported as slowed by the 293 * idle routine. Otherwise, define as 0. 294 */ 295 #define ALWAYS_CALL_BUSY 1 296 297 /* 298 * Define to make the APM BIOS calls zero all data segment registers (so 299 * that an incorrect BIOS implementation will cause a kernel panic if it 300 * tries to write to arbitrary memory). 301 */ 302 #define APM_ZERO_SEGS 303 304 #include <asm/apm.h> 305 306 /* 307 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. 308 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by 309 * David Chen <chen@ctpa04.mit.edu> 310 */ 311 #undef INIT_TIMER_AFTER_SUSPEND 312 313 #ifdef INIT_TIMER_AFTER_SUSPEND 314 #include <linux/timex.h> 315 #include <asm/io.h> 316 #include <linux/delay.h> 317 #endif 318 319 /* 320 * Need to poll the APM BIOS every second 321 */ 322 #define APM_CHECK_TIMEOUT (HZ) 323 324 /* 325 * Ignore suspend events for this amount of time after a resume 326 */ 327 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) 328 329 /* 330 * Maximum number of events stored 331 */ 332 #define APM_MAX_EVENTS 20 333 334 /* 335 * The per-file APM data 336 */ 337 struct apm_user { 338 int magic; 339 struct apm_user *next; 340 unsigned int suser: 1; 341 unsigned int writer: 1; 342 unsigned int reader: 1; 343 unsigned int suspend_wait: 1; 344 int suspend_result; 345 int suspends_pending; 346 int standbys_pending; 347 int suspends_read; 348 int standbys_read; 349 int event_head; 350 int event_tail; 351 apm_event_t events[APM_MAX_EVENTS]; 352 }; 353 354 /* 355 * The magic number in apm_user 356 */ 357 #define APM_BIOS_MAGIC 0x4101 358 359 /* 360 * idle percentage above which bios idle calls are done 361 */ 362 #ifdef CONFIG_APM_CPU_IDLE 363 #define DEFAULT_IDLE_THRESHOLD 95 364 #else 365 #define DEFAULT_IDLE_THRESHOLD 100 366 #endif 367 #define DEFAULT_IDLE_PERIOD (100 / 3) 368 369 /* 370 * Local variables 371 */ 372 static struct { 373 unsigned long offset; 374 unsigned short segment; 375 } apm_bios_entry; 376 static int clock_slowed; 377 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; 378 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; 379 static int set_pm_idle; 380 static int suspends_pending; 381 static int standbys_pending; 382 static int ignore_sys_suspend; 383 static int ignore_normal_resume; 384 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; 385 386 static int debug __read_mostly; 387 static int smp __read_mostly; 388 static int apm_disabled = -1; 389 #ifdef CONFIG_SMP 390 static int power_off; 391 #else 392 static int power_off = 1; 393 #endif 394 static int realmode_power_off; 395 #ifdef CONFIG_APM_ALLOW_INTS 396 static int allow_ints = 1; 397 #else 398 static int allow_ints; 399 #endif 400 static int broken_psr; 401 402 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); 403 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); 404 static struct apm_user *user_list; 405 static DEFINE_SPINLOCK(user_list_lock); 406 static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } }; 407 408 static const char driver_version[] = "1.16ac"; /* no spaces */ 409 410 static struct task_struct *kapmd_task; 411 412 /* 413 * APM event names taken from the APM 1.2 specification. These are 414 * the message codes that the BIOS uses to tell us about events 415 */ 416 static const char * const apm_event_name[] = { 417 "system standby", 418 "system suspend", 419 "normal resume", 420 "critical resume", 421 "low battery", 422 "power status change", 423 "update time", 424 "critical suspend", 425 "user standby", 426 "user suspend", 427 "system standby resume", 428 "capabilities change" 429 }; 430 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) 431 432 typedef struct lookup_t { 433 int key; 434 char *msg; 435 } lookup_t; 436 437 /* 438 * The BIOS returns a set of standard error codes in AX when the 439 * carry flag is set. 440 */ 441 442 static const lookup_t error_table[] = { 443 /* N/A { APM_SUCCESS, "Operation succeeded" }, */ 444 { APM_DISABLED, "Power management disabled" }, 445 { APM_CONNECTED, "Real mode interface already connected" }, 446 { APM_NOT_CONNECTED, "Interface not connected" }, 447 { APM_16_CONNECTED, "16 bit interface already connected" }, 448 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ 449 { APM_32_CONNECTED, "32 bit interface already connected" }, 450 { APM_32_UNSUPPORTED, "32 bit interface not supported" }, 451 { APM_BAD_DEVICE, "Unrecognized device ID" }, 452 { APM_BAD_PARAM, "Parameter out of range" }, 453 { APM_NOT_ENGAGED, "Interface not engaged" }, 454 { APM_BAD_FUNCTION, "Function not supported" }, 455 { APM_RESUME_DISABLED, "Resume timer disabled" }, 456 { APM_BAD_STATE, "Unable to enter requested state" }, 457 /* N/A { APM_NO_EVENTS, "No events pending" }, */ 458 { APM_NO_ERROR, "BIOS did not set a return code" }, 459 { APM_NOT_PRESENT, "No APM present" } 460 }; 461 #define ERROR_COUNT ARRAY_SIZE(error_table) 462 463 /** 464 * apm_error - display an APM error 465 * @str: information string 466 * @err: APM BIOS return code 467 * 468 * Write a meaningful log entry to the kernel log in the event of 469 * an APM error. 470 */ 471 472 static void apm_error(char *str, int err) 473 { 474 int i; 475 476 for (i = 0; i < ERROR_COUNT; i++) 477 if (error_table[i].key == err) 478 break; 479 if (i < ERROR_COUNT) 480 printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg); 481 else 482 printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n", 483 str, err); 484 } 485 486 /* 487 * Lock APM functionality to physical CPU 0 488 */ 489 490 #ifdef CONFIG_SMP 491 492 static cpumask_t apm_save_cpus(void) 493 { 494 cpumask_t x = current->cpus_allowed; 495 /* Some bioses don't like being called from CPU != 0 */ 496 set_cpus_allowed(current, cpumask_of_cpu(0)); 497 BUG_ON(smp_processor_id() != 0); 498 return x; 499 } 500 501 static inline void apm_restore_cpus(cpumask_t mask) 502 { 503 set_cpus_allowed(current, mask); 504 } 505 506 #else 507 508 /* 509 * No CPU lockdown needed on a uniprocessor 510 */ 511 512 #define apm_save_cpus() (current->cpus_allowed) 513 #define apm_restore_cpus(x) (void)(x) 514 515 #endif 516 517 /* 518 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and 519 * apm_info.allow_ints, we are being really paranoid here! Not only 520 * are interrupts disabled, but all the segment registers (except SS) 521 * are saved and zeroed this means that if the BIOS tries to reference 522 * any data without explicitly loading the segment registers, the kernel 523 * will fault immediately rather than have some unforeseen circumstances 524 * for the rest of the kernel. And it will be very obvious! :-) Doing 525 * this depends on CS referring to the same physical memory as DS so that 526 * DS can be zeroed before the call. Unfortunately, we can't do anything 527 * about the stack segment/pointer. Also, we tell the compiler that 528 * everything could change. 529 * 530 * Also, we KNOW that for the non error case of apm_bios_call, there 531 * is no useful data returned in the low order 8 bits of eax. 532 */ 533 534 static inline unsigned long __apm_irq_save(void) 535 { 536 unsigned long flags; 537 local_save_flags(flags); 538 if (apm_info.allow_ints) { 539 if (irqs_disabled_flags(flags)) 540 local_irq_enable(); 541 } else 542 local_irq_disable(); 543 544 return flags; 545 } 546 547 #define apm_irq_save(flags) \ 548 do { flags = __apm_irq_save(); } while (0) 549 550 static inline void apm_irq_restore(unsigned long flags) 551 { 552 if (irqs_disabled_flags(flags)) 553 local_irq_disable(); 554 else if (irqs_disabled()) 555 local_irq_enable(); 556 } 557 558 #ifdef APM_ZERO_SEGS 559 # define APM_DECL_SEGS \ 560 unsigned int saved_fs; unsigned int saved_gs; 561 # define APM_DO_SAVE_SEGS \ 562 savesegment(fs, saved_fs); savesegment(gs, saved_gs) 563 # define APM_DO_RESTORE_SEGS \ 564 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) 565 #else 566 # define APM_DECL_SEGS 567 # define APM_DO_SAVE_SEGS 568 # define APM_DO_RESTORE_SEGS 569 #endif 570 571 /** 572 * apm_bios_call - Make an APM BIOS 32bit call 573 * @func: APM function to execute 574 * @ebx_in: EBX register for call entry 575 * @ecx_in: ECX register for call entry 576 * @eax: EAX register return 577 * @ebx: EBX register return 578 * @ecx: ECX register return 579 * @edx: EDX register return 580 * @esi: ESI register return 581 * 582 * Make an APM call using the 32bit protected mode interface. The 583 * caller is responsible for knowing if APM BIOS is configured and 584 * enabled. This call can disable interrupts for a long period of 585 * time on some laptops. The return value is in AH and the carry 586 * flag is loaded into AL. If there is an error, then the error 587 * code is returned in AH (bits 8-15 of eax) and this function 588 * returns non-zero. 589 */ 590 591 static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in, 592 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi) 593 { 594 APM_DECL_SEGS 595 unsigned long flags; 596 cpumask_t cpus; 597 int cpu; 598 struct desc_struct save_desc_40; 599 struct desc_struct *gdt; 600 601 cpus = apm_save_cpus(); 602 603 cpu = get_cpu(); 604 gdt = get_cpu_gdt_table(cpu); 605 save_desc_40 = gdt[0x40 / 8]; 606 gdt[0x40 / 8] = bad_bios_desc; 607 608 apm_irq_save(flags); 609 APM_DO_SAVE_SEGS; 610 apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi); 611 APM_DO_RESTORE_SEGS; 612 apm_irq_restore(flags); 613 gdt[0x40 / 8] = save_desc_40; 614 put_cpu(); 615 apm_restore_cpus(cpus); 616 617 return *eax & 0xff; 618 } 619 620 /** 621 * apm_bios_call_simple - make a simple APM BIOS 32bit call 622 * @func: APM function to invoke 623 * @ebx_in: EBX register value for BIOS call 624 * @ecx_in: ECX register value for BIOS call 625 * @eax: EAX register on return from the BIOS call 626 * 627 * Make a BIOS call that returns one value only, or just status. 628 * If there is an error, then the error code is returned in AH 629 * (bits 8-15 of eax) and this function returns non-zero. This is 630 * used for simpler BIOS operations. This call may hold interrupts 631 * off for a long time on some laptops. 632 */ 633 634 static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax) 635 { 636 u8 error; 637 APM_DECL_SEGS 638 unsigned long flags; 639 cpumask_t cpus; 640 int cpu; 641 struct desc_struct save_desc_40; 642 struct desc_struct *gdt; 643 644 cpus = apm_save_cpus(); 645 646 cpu = get_cpu(); 647 gdt = get_cpu_gdt_table(cpu); 648 save_desc_40 = gdt[0x40 / 8]; 649 gdt[0x40 / 8] = bad_bios_desc; 650 651 apm_irq_save(flags); 652 APM_DO_SAVE_SEGS; 653 error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax); 654 APM_DO_RESTORE_SEGS; 655 apm_irq_restore(flags); 656 gdt[0x40 / 8] = save_desc_40; 657 put_cpu(); 658 apm_restore_cpus(cpus); 659 return error; 660 } 661 662 /** 663 * apm_driver_version - APM driver version 664 * @val: loaded with the APM version on return 665 * 666 * Retrieve the APM version supported by the BIOS. This is only 667 * supported for APM 1.1 or higher. An error indicates APM 1.0 is 668 * probably present. 669 * 670 * On entry val should point to a value indicating the APM driver 671 * version with the high byte being the major and the low byte the 672 * minor number both in BCD 673 * 674 * On return it will hold the BIOS revision supported in the 675 * same format. 676 */ 677 678 static int apm_driver_version(u_short *val) 679 { 680 u32 eax; 681 682 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax)) 683 return (eax >> 8) & 0xff; 684 *val = eax; 685 return APM_SUCCESS; 686 } 687 688 /** 689 * apm_get_event - get an APM event from the BIOS 690 * @event: pointer to the event 691 * @info: point to the event information 692 * 693 * The APM BIOS provides a polled information for event 694 * reporting. The BIOS expects to be polled at least every second 695 * when events are pending. When a message is found the caller should 696 * poll until no more messages are present. However, this causes 697 * problems on some laptops where a suspend event notification is 698 * not cleared until it is acknowledged. 699 * 700 * Additional information is returned in the info pointer, providing 701 * that APM 1.2 is in use. If no messges are pending the value 0x80 702 * is returned (No power management events pending). 703 */ 704 705 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) 706 { 707 u32 eax; 708 u32 ebx; 709 u32 ecx; 710 u32 dummy; 711 712 if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx, 713 &dummy, &dummy)) 714 return (eax >> 8) & 0xff; 715 *event = ebx; 716 if (apm_info.connection_version < 0x0102) 717 *info = ~0; /* indicate info not valid */ 718 else 719 *info = ecx; 720 return APM_SUCCESS; 721 } 722 723 /** 724 * set_power_state - set the power management state 725 * @what: which items to transition 726 * @state: state to transition to 727 * 728 * Request an APM change of state for one or more system devices. The 729 * processor state must be transitioned last of all. what holds the 730 * class of device in the upper byte and the device number (0xFF for 731 * all) for the object to be transitioned. 732 * 733 * The state holds the state to transition to, which may in fact 734 * be an acceptance of a BIOS requested state change. 735 */ 736 737 static int set_power_state(u_short what, u_short state) 738 { 739 u32 eax; 740 741 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax)) 742 return (eax >> 8) & 0xff; 743 return APM_SUCCESS; 744 } 745 746 /** 747 * set_system_power_state - set system wide power state 748 * @state: which state to enter 749 * 750 * Transition the entire system into a new APM power state. 751 */ 752 753 static int set_system_power_state(u_short state) 754 { 755 return set_power_state(APM_DEVICE_ALL, state); 756 } 757 758 /** 759 * apm_do_idle - perform power saving 760 * 761 * This function notifies the BIOS that the processor is (in the view 762 * of the OS) idle. It returns -1 in the event that the BIOS refuses 763 * to handle the idle request. On a success the function returns 1 764 * if the BIOS did clock slowing or 0 otherwise. 765 */ 766 767 static int apm_do_idle(void) 768 { 769 u32 eax; 770 u8 ret = 0; 771 int idled = 0; 772 int polling; 773 774 polling = !!(current_thread_info()->status & TS_POLLING); 775 if (polling) { 776 current_thread_info()->status &= ~TS_POLLING; 777 /* 778 * TS_POLLING-cleared state must be visible before we 779 * test NEED_RESCHED: 780 */ 781 smp_mb(); 782 } 783 if (!need_resched()) { 784 idled = 1; 785 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax); 786 } 787 if (polling) 788 current_thread_info()->status |= TS_POLLING; 789 790 if (!idled) 791 return 0; 792 793 if (ret) { 794 static unsigned long t; 795 796 /* This always fails on some SMP boards running UP kernels. 797 * Only report the failure the first 5 times. 798 */ 799 if (++t < 5) { 800 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", 801 (eax >> 8) & 0xff); 802 t = jiffies; 803 } 804 return -1; 805 } 806 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; 807 return clock_slowed; 808 } 809 810 /** 811 * apm_do_busy - inform the BIOS the CPU is busy 812 * 813 * Request that the BIOS brings the CPU back to full performance. 814 */ 815 816 static void apm_do_busy(void) 817 { 818 u32 dummy; 819 820 if (clock_slowed || ALWAYS_CALL_BUSY) { 821 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy); 822 clock_slowed = 0; 823 } 824 } 825 826 /* 827 * If no process has really been interested in 828 * the CPU for some time, we want to call BIOS 829 * power management - we probably want 830 * to conserve power. 831 */ 832 #define IDLE_CALC_LIMIT (HZ * 100) 833 #define IDLE_LEAKY_MAX 16 834 835 static void (*original_pm_idle)(void) __read_mostly; 836 837 /** 838 * apm_cpu_idle - cpu idling for APM capable Linux 839 * 840 * This is the idling function the kernel executes when APM is available. It 841 * tries to do BIOS powermanagement based on the average system idle time. 842 * Furthermore it calls the system default idle routine. 843 */ 844 845 static void apm_cpu_idle(void) 846 { 847 static int use_apm_idle; /* = 0 */ 848 static unsigned int last_jiffies; /* = 0 */ 849 static unsigned int last_stime; /* = 0 */ 850 851 int apm_idle_done = 0; 852 unsigned int jiffies_since_last_check = jiffies - last_jiffies; 853 unsigned int bucket; 854 855 recalc: 856 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 857 use_apm_idle = 0; 858 last_jiffies = jiffies; 859 last_stime = current->stime; 860 } else if (jiffies_since_last_check > idle_period) { 861 unsigned int idle_percentage; 862 863 idle_percentage = current->stime - last_stime; 864 idle_percentage *= 100; 865 idle_percentage /= jiffies_since_last_check; 866 use_apm_idle = (idle_percentage > idle_threshold); 867 if (apm_info.forbid_idle) 868 use_apm_idle = 0; 869 last_jiffies = jiffies; 870 last_stime = current->stime; 871 } 872 873 bucket = IDLE_LEAKY_MAX; 874 875 while (!need_resched()) { 876 if (use_apm_idle) { 877 unsigned int t; 878 879 t = jiffies; 880 switch (apm_do_idle()) { 881 case 0: 882 apm_idle_done = 1; 883 if (t != jiffies) { 884 if (bucket) { 885 bucket = IDLE_LEAKY_MAX; 886 continue; 887 } 888 } else if (bucket) { 889 bucket--; 890 continue; 891 } 892 break; 893 case 1: 894 apm_idle_done = 1; 895 break; 896 default: /* BIOS refused */ 897 break; 898 } 899 } 900 if (original_pm_idle) 901 original_pm_idle(); 902 else 903 default_idle(); 904 local_irq_disable(); 905 jiffies_since_last_check = jiffies - last_jiffies; 906 if (jiffies_since_last_check > idle_period) 907 goto recalc; 908 } 909 910 if (apm_idle_done) 911 apm_do_busy(); 912 913 local_irq_enable(); 914 } 915 916 /** 917 * apm_power_off - ask the BIOS to power off 918 * 919 * Handle the power off sequence. This is the one piece of code we 920 * will execute even on SMP machines. In order to deal with BIOS 921 * bugs we support real mode APM BIOS power off calls. We also make 922 * the SMP call on CPU0 as some systems will only honour this call 923 * on their first cpu. 924 */ 925 926 static void apm_power_off(void) 927 { 928 unsigned char po_bios_call[] = { 929 0xb8, 0x00, 0x10, /* movw $0x1000,ax */ 930 0x8e, 0xd0, /* movw ax,ss */ 931 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */ 932 0xb8, 0x07, 0x53, /* movw $0x5307,ax */ 933 0xbb, 0x01, 0x00, /* movw $0x0001,bx */ 934 0xb9, 0x03, 0x00, /* movw $0x0003,cx */ 935 0xcd, 0x15 /* int $0x15 */ 936 }; 937 938 /* Some bioses don't like being called from CPU != 0 */ 939 if (apm_info.realmode_power_off) { 940 (void)apm_save_cpus(); 941 machine_real_restart(po_bios_call, sizeof(po_bios_call)); 942 } else { 943 (void)set_system_power_state(APM_STATE_OFF); 944 } 945 } 946 947 #ifdef CONFIG_APM_DO_ENABLE 948 949 /** 950 * apm_enable_power_management - enable BIOS APM power management 951 * @enable: enable yes/no 952 * 953 * Enable or disable the APM BIOS power services. 954 */ 955 956 static int apm_enable_power_management(int enable) 957 { 958 u32 eax; 959 960 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 961 return APM_NOT_ENGAGED; 962 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 963 enable, &eax)) 964 return (eax >> 8) & 0xff; 965 if (enable) 966 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 967 else 968 apm_info.bios.flags |= APM_BIOS_DISABLED; 969 return APM_SUCCESS; 970 } 971 #endif 972 973 /** 974 * apm_get_power_status - get current power state 975 * @status: returned status 976 * @bat: battery info 977 * @life: estimated life 978 * 979 * Obtain the current power status from the APM BIOS. We return a 980 * status which gives the rough battery status, and current power 981 * source. The bat value returned give an estimate as a percentage 982 * of life and a status value for the battery. The estimated life 983 * if reported is a lifetime in secodnds/minutes at current powwer 984 * consumption. 985 */ 986 987 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 988 { 989 u32 eax; 990 u32 ebx; 991 u32 ecx; 992 u32 edx; 993 u32 dummy; 994 995 if (apm_info.get_power_status_broken) 996 return APM_32_UNSUPPORTED; 997 if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0, 998 &eax, &ebx, &ecx, &edx, &dummy)) 999 return (eax >> 8) & 0xff; 1000 *status = ebx; 1001 *bat = ecx; 1002 if (apm_info.get_power_status_swabinminutes) { 1003 *life = swab16((u16)edx); 1004 *life |= 0x8000; 1005 } else 1006 *life = edx; 1007 return APM_SUCCESS; 1008 } 1009 1010 #if 0 1011 static int apm_get_battery_status(u_short which, u_short *status, 1012 u_short *bat, u_short *life, u_short *nbat) 1013 { 1014 u32 eax; 1015 u32 ebx; 1016 u32 ecx; 1017 u32 edx; 1018 u32 esi; 1019 1020 if (apm_info.connection_version < 0x0102) { 1021 /* pretend we only have one battery. */ 1022 if (which != 1) 1023 return APM_BAD_DEVICE; 1024 *nbat = 1; 1025 return apm_get_power_status(status, bat, life); 1026 } 1027 1028 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1029 &ebx, &ecx, &edx, &esi)) 1030 return (eax >> 8) & 0xff; 1031 *status = ebx; 1032 *bat = ecx; 1033 *life = edx; 1034 *nbat = esi; 1035 return APM_SUCCESS; 1036 } 1037 #endif 1038 1039 /** 1040 * apm_engage_power_management - enable PM on a device 1041 * @device: identity of device 1042 * @enable: on/off 1043 * 1044 * Activate or deactive power management on either a specific device 1045 * or the entire system (%APM_DEVICE_ALL). 1046 */ 1047 1048 static int apm_engage_power_management(u_short device, int enable) 1049 { 1050 u32 eax; 1051 1052 if ((enable == 0) && (device == APM_DEVICE_ALL) 1053 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1054 return APM_DISABLED; 1055 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax)) 1056 return (eax >> 8) & 0xff; 1057 if (device == APM_DEVICE_ALL) { 1058 if (enable) 1059 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1060 else 1061 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1062 } 1063 return APM_SUCCESS; 1064 } 1065 1066 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1067 1068 /** 1069 * apm_console_blank - blank the display 1070 * @blank: on/off 1071 * 1072 * Attempt to blank the console, firstly by blanking just video device 1073 * zero, and if that fails (some BIOSes don't support it) then it blanks 1074 * all video devices. Typically the BIOS will do laptop backlight and 1075 * monitor powerdown for us. 1076 */ 1077 1078 static int apm_console_blank(int blank) 1079 { 1080 int error = APM_NOT_ENGAGED; /* silence gcc */ 1081 int i; 1082 u_short state; 1083 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1084 1085 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1086 1087 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1088 error = set_power_state(dev[i], state); 1089 1090 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1091 return 1; 1092 1093 if (error == APM_NOT_ENGAGED) 1094 break; 1095 } 1096 1097 if (error == APM_NOT_ENGAGED) { 1098 static int tried; 1099 int eng_error; 1100 if (tried++ == 0) { 1101 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1102 if (eng_error) { 1103 apm_error("set display", error); 1104 apm_error("engage interface", eng_error); 1105 return 0; 1106 } else 1107 return apm_console_blank(blank); 1108 } 1109 } 1110 apm_error("set display", error); 1111 return 0; 1112 } 1113 #endif 1114 1115 static int queue_empty(struct apm_user *as) 1116 { 1117 return as->event_head == as->event_tail; 1118 } 1119 1120 static apm_event_t get_queued_event(struct apm_user *as) 1121 { 1122 if (++as->event_tail >= APM_MAX_EVENTS) 1123 as->event_tail = 0; 1124 return as->events[as->event_tail]; 1125 } 1126 1127 static void queue_event(apm_event_t event, struct apm_user *sender) 1128 { 1129 struct apm_user *as; 1130 1131 spin_lock(&user_list_lock); 1132 if (user_list == NULL) 1133 goto out; 1134 for (as = user_list; as != NULL; as = as->next) { 1135 if ((as == sender) || (!as->reader)) 1136 continue; 1137 if (++as->event_head >= APM_MAX_EVENTS) 1138 as->event_head = 0; 1139 1140 if (as->event_head == as->event_tail) { 1141 static int notified; 1142 1143 if (notified++ == 0) 1144 printk(KERN_ERR "apm: an event queue overflowed\n"); 1145 if (++as->event_tail >= APM_MAX_EVENTS) 1146 as->event_tail = 0; 1147 } 1148 as->events[as->event_head] = event; 1149 if (!as->suser || !as->writer) 1150 continue; 1151 switch (event) { 1152 case APM_SYS_SUSPEND: 1153 case APM_USER_SUSPEND: 1154 as->suspends_pending++; 1155 suspends_pending++; 1156 break; 1157 1158 case APM_SYS_STANDBY: 1159 case APM_USER_STANDBY: 1160 as->standbys_pending++; 1161 standbys_pending++; 1162 break; 1163 } 1164 } 1165 wake_up_interruptible(&apm_waitqueue); 1166 out: 1167 spin_unlock(&user_list_lock); 1168 } 1169 1170 static void reinit_timer(void) 1171 { 1172 #ifdef INIT_TIMER_AFTER_SUSPEND 1173 unsigned long flags; 1174 1175 spin_lock_irqsave(&i8253_lock, flags); 1176 /* set the clock to HZ */ 1177 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1178 udelay(10); 1179 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */ 1180 udelay(10); 1181 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */ 1182 udelay(10); 1183 spin_unlock_irqrestore(&i8253_lock, flags); 1184 #endif 1185 } 1186 1187 static int suspend(int vetoable) 1188 { 1189 int err; 1190 struct apm_user *as; 1191 1192 device_suspend(PMSG_SUSPEND); 1193 1194 device_power_down(PMSG_SUSPEND); 1195 1196 local_irq_disable(); 1197 sysdev_suspend(PMSG_SUSPEND); 1198 1199 local_irq_enable(); 1200 1201 save_processor_state(); 1202 err = set_system_power_state(APM_STATE_SUSPEND); 1203 ignore_normal_resume = 1; 1204 restore_processor_state(); 1205 1206 local_irq_disable(); 1207 reinit_timer(); 1208 1209 if (err == APM_NO_ERROR) 1210 err = APM_SUCCESS; 1211 if (err != APM_SUCCESS) 1212 apm_error("suspend", err); 1213 err = (err == APM_SUCCESS) ? 0 : -EIO; 1214 1215 sysdev_resume(); 1216 local_irq_enable(); 1217 1218 device_power_up(PMSG_RESUME); 1219 1220 device_resume(PMSG_RESUME); 1221 queue_event(APM_NORMAL_RESUME, NULL); 1222 spin_lock(&user_list_lock); 1223 for (as = user_list; as != NULL; as = as->next) { 1224 as->suspend_wait = 0; 1225 as->suspend_result = err; 1226 } 1227 spin_unlock(&user_list_lock); 1228 wake_up_interruptible(&apm_suspend_waitqueue); 1229 return err; 1230 } 1231 1232 static void standby(void) 1233 { 1234 int err; 1235 1236 device_power_down(PMSG_SUSPEND); 1237 1238 local_irq_disable(); 1239 sysdev_suspend(PMSG_SUSPEND); 1240 local_irq_enable(); 1241 1242 err = set_system_power_state(APM_STATE_STANDBY); 1243 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1244 apm_error("standby", err); 1245 1246 local_irq_disable(); 1247 sysdev_resume(); 1248 local_irq_enable(); 1249 1250 device_power_up(PMSG_RESUME); 1251 } 1252 1253 static apm_event_t get_event(void) 1254 { 1255 int error; 1256 apm_event_t event = APM_NO_EVENTS; /* silence gcc */ 1257 apm_eventinfo_t info; 1258 1259 static int notified; 1260 1261 /* we don't use the eventinfo */ 1262 error = apm_get_event(&event, &info); 1263 if (error == APM_SUCCESS) 1264 return event; 1265 1266 if ((error != APM_NO_EVENTS) && (notified++ == 0)) 1267 apm_error("get_event", error); 1268 1269 return 0; 1270 } 1271 1272 static void check_events(void) 1273 { 1274 apm_event_t event; 1275 static unsigned long last_resume; 1276 static int ignore_bounce; 1277 1278 while ((event = get_event()) != 0) { 1279 if (debug) { 1280 if (event <= NR_APM_EVENT_NAME) 1281 printk(KERN_DEBUG "apm: received %s notify\n", 1282 apm_event_name[event - 1]); 1283 else 1284 printk(KERN_DEBUG "apm: received unknown " 1285 "event 0x%02x\n", event); 1286 } 1287 if (ignore_bounce 1288 && (time_after(jiffies, last_resume + bounce_interval))) 1289 ignore_bounce = 0; 1290 1291 switch (event) { 1292 case APM_SYS_STANDBY: 1293 case APM_USER_STANDBY: 1294 queue_event(event, NULL); 1295 if (standbys_pending <= 0) 1296 standby(); 1297 break; 1298 1299 case APM_USER_SUSPEND: 1300 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND 1301 if (apm_info.connection_version > 0x100) 1302 set_system_power_state(APM_STATE_REJECT); 1303 break; 1304 #endif 1305 case APM_SYS_SUSPEND: 1306 if (ignore_bounce) { 1307 if (apm_info.connection_version > 0x100) 1308 set_system_power_state(APM_STATE_REJECT); 1309 break; 1310 } 1311 /* 1312 * If we are already processing a SUSPEND, 1313 * then further SUSPEND events from the BIOS 1314 * will be ignored. We also return here to 1315 * cope with the fact that the Thinkpads keep 1316 * sending a SUSPEND event until something else 1317 * happens! 1318 */ 1319 if (ignore_sys_suspend) 1320 return; 1321 ignore_sys_suspend = 1; 1322 queue_event(event, NULL); 1323 if (suspends_pending <= 0) 1324 (void) suspend(1); 1325 break; 1326 1327 case APM_NORMAL_RESUME: 1328 case APM_CRITICAL_RESUME: 1329 case APM_STANDBY_RESUME: 1330 ignore_sys_suspend = 0; 1331 last_resume = jiffies; 1332 ignore_bounce = 1; 1333 if ((event != APM_NORMAL_RESUME) 1334 || (ignore_normal_resume == 0)) { 1335 device_resume(PMSG_RESUME); 1336 queue_event(event, NULL); 1337 } 1338 ignore_normal_resume = 0; 1339 break; 1340 1341 case APM_CAPABILITY_CHANGE: 1342 case APM_LOW_BATTERY: 1343 case APM_POWER_STATUS_CHANGE: 1344 queue_event(event, NULL); 1345 /* If needed, notify drivers here */ 1346 break; 1347 1348 case APM_UPDATE_TIME: 1349 break; 1350 1351 case APM_CRITICAL_SUSPEND: 1352 /* 1353 * We are not allowed to reject a critical suspend. 1354 */ 1355 (void)suspend(0); 1356 break; 1357 } 1358 } 1359 } 1360 1361 static void apm_event_handler(void) 1362 { 1363 static int pending_count = 4; 1364 int err; 1365 1366 if ((standbys_pending > 0) || (suspends_pending > 0)) { 1367 if ((apm_info.connection_version > 0x100) && 1368 (pending_count-- <= 0)) { 1369 pending_count = 4; 1370 if (debug) 1371 printk(KERN_DEBUG "apm: setting state busy\n"); 1372 err = set_system_power_state(APM_STATE_BUSY); 1373 if (err) 1374 apm_error("busy", err); 1375 } 1376 } else 1377 pending_count = 4; 1378 check_events(); 1379 } 1380 1381 /* 1382 * This is the APM thread main loop. 1383 */ 1384 1385 static void apm_mainloop(void) 1386 { 1387 DECLARE_WAITQUEUE(wait, current); 1388 1389 add_wait_queue(&apm_waitqueue, &wait); 1390 set_current_state(TASK_INTERRUPTIBLE); 1391 for (;;) { 1392 schedule_timeout(APM_CHECK_TIMEOUT); 1393 if (kthread_should_stop()) 1394 break; 1395 /* 1396 * Ok, check all events, check for idle (and mark us sleeping 1397 * so as not to count towards the load average).. 1398 */ 1399 set_current_state(TASK_INTERRUPTIBLE); 1400 apm_event_handler(); 1401 } 1402 remove_wait_queue(&apm_waitqueue, &wait); 1403 } 1404 1405 static int check_apm_user(struct apm_user *as, const char *func) 1406 { 1407 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1408 printk(KERN_ERR "apm: %s passed bad filp\n", func); 1409 return 1; 1410 } 1411 return 0; 1412 } 1413 1414 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) 1415 { 1416 struct apm_user *as; 1417 int i; 1418 apm_event_t event; 1419 1420 as = fp->private_data; 1421 if (check_apm_user(as, "read")) 1422 return -EIO; 1423 if ((int)count < sizeof(apm_event_t)) 1424 return -EINVAL; 1425 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) 1426 return -EAGAIN; 1427 wait_event_interruptible(apm_waitqueue, !queue_empty(as)); 1428 i = count; 1429 while ((i >= sizeof(event)) && !queue_empty(as)) { 1430 event = get_queued_event(as); 1431 if (copy_to_user(buf, &event, sizeof(event))) { 1432 if (i < count) 1433 break; 1434 return -EFAULT; 1435 } 1436 switch (event) { 1437 case APM_SYS_SUSPEND: 1438 case APM_USER_SUSPEND: 1439 as->suspends_read++; 1440 break; 1441 1442 case APM_SYS_STANDBY: 1443 case APM_USER_STANDBY: 1444 as->standbys_read++; 1445 break; 1446 } 1447 buf += sizeof(event); 1448 i -= sizeof(event); 1449 } 1450 if (i < count) 1451 return count - i; 1452 if (signal_pending(current)) 1453 return -ERESTARTSYS; 1454 return 0; 1455 } 1456 1457 static unsigned int do_poll(struct file *fp, poll_table *wait) 1458 { 1459 struct apm_user *as; 1460 1461 as = fp->private_data; 1462 if (check_apm_user(as, "poll")) 1463 return 0; 1464 poll_wait(fp, &apm_waitqueue, wait); 1465 if (!queue_empty(as)) 1466 return POLLIN | POLLRDNORM; 1467 return 0; 1468 } 1469 1470 static long do_ioctl(struct file *filp, u_int cmd, u_long arg) 1471 { 1472 struct apm_user *as; 1473 int ret; 1474 1475 as = filp->private_data; 1476 if (check_apm_user(as, "ioctl")) 1477 return -EIO; 1478 if (!as->suser || !as->writer) 1479 return -EPERM; 1480 switch (cmd) { 1481 case APM_IOC_STANDBY: 1482 lock_kernel(); 1483 if (as->standbys_read > 0) { 1484 as->standbys_read--; 1485 as->standbys_pending--; 1486 standbys_pending--; 1487 } else 1488 queue_event(APM_USER_STANDBY, as); 1489 if (standbys_pending <= 0) 1490 standby(); 1491 unlock_kernel(); 1492 break; 1493 case APM_IOC_SUSPEND: 1494 lock_kernel(); 1495 if (as->suspends_read > 0) { 1496 as->suspends_read--; 1497 as->suspends_pending--; 1498 suspends_pending--; 1499 } else 1500 queue_event(APM_USER_SUSPEND, as); 1501 if (suspends_pending <= 0) { 1502 ret = suspend(1); 1503 } else { 1504 as->suspend_wait = 1; 1505 wait_event_interruptible(apm_suspend_waitqueue, 1506 as->suspend_wait == 0); 1507 ret = as->suspend_result; 1508 } 1509 unlock_kernel(); 1510 return ret; 1511 default: 1512 return -ENOTTY; 1513 } 1514 return 0; 1515 } 1516 1517 static int do_release(struct inode *inode, struct file *filp) 1518 { 1519 struct apm_user *as; 1520 1521 as = filp->private_data; 1522 if (check_apm_user(as, "release")) 1523 return 0; 1524 filp->private_data = NULL; 1525 if (as->standbys_pending > 0) { 1526 standbys_pending -= as->standbys_pending; 1527 if (standbys_pending <= 0) 1528 standby(); 1529 } 1530 if (as->suspends_pending > 0) { 1531 suspends_pending -= as->suspends_pending; 1532 if (suspends_pending <= 0) 1533 (void) suspend(1); 1534 } 1535 spin_lock(&user_list_lock); 1536 if (user_list == as) 1537 user_list = as->next; 1538 else { 1539 struct apm_user *as1; 1540 1541 for (as1 = user_list; 1542 (as1 != NULL) && (as1->next != as); 1543 as1 = as1->next) 1544 ; 1545 if (as1 == NULL) 1546 printk(KERN_ERR "apm: filp not in user list\n"); 1547 else 1548 as1->next = as->next; 1549 } 1550 spin_unlock(&user_list_lock); 1551 kfree(as); 1552 return 0; 1553 } 1554 1555 static int do_open(struct inode *inode, struct file *filp) 1556 { 1557 struct apm_user *as; 1558 1559 lock_kernel(); 1560 as = kmalloc(sizeof(*as), GFP_KERNEL); 1561 if (as == NULL) { 1562 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", 1563 sizeof(*as)); 1564 unlock_kernel(); 1565 return -ENOMEM; 1566 } 1567 as->magic = APM_BIOS_MAGIC; 1568 as->event_tail = as->event_head = 0; 1569 as->suspends_pending = as->standbys_pending = 0; 1570 as->suspends_read = as->standbys_read = 0; 1571 /* 1572 * XXX - this is a tiny bit broken, when we consider BSD 1573 * process accounting. If the device is opened by root, we 1574 * instantly flag that we used superuser privs. Who knows, 1575 * we might close the device immediately without doing a 1576 * privileged operation -- cevans 1577 */ 1578 as->suser = capable(CAP_SYS_ADMIN); 1579 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1580 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1581 spin_lock(&user_list_lock); 1582 as->next = user_list; 1583 user_list = as; 1584 spin_unlock(&user_list_lock); 1585 filp->private_data = as; 1586 unlock_kernel(); 1587 return 0; 1588 } 1589 1590 static int proc_apm_show(struct seq_file *m, void *v) 1591 { 1592 unsigned short bx; 1593 unsigned short cx; 1594 unsigned short dx; 1595 int error; 1596 unsigned short ac_line_status = 0xff; 1597 unsigned short battery_status = 0xff; 1598 unsigned short battery_flag = 0xff; 1599 int percentage = -1; 1600 int time_units = -1; 1601 char *units = "?"; 1602 1603 if ((num_online_cpus() == 1) && 1604 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1605 ac_line_status = (bx >> 8) & 0xff; 1606 battery_status = bx & 0xff; 1607 if ((cx & 0xff) != 0xff) 1608 percentage = cx & 0xff; 1609 1610 if (apm_info.connection_version > 0x100) { 1611 battery_flag = (cx >> 8) & 0xff; 1612 if (dx != 0xffff) { 1613 units = (dx & 0x8000) ? "min" : "sec"; 1614 time_units = dx & 0x7fff; 1615 } 1616 } 1617 } 1618 /* Arguments, with symbols from linux/apm_bios.h. Information is 1619 from the Get Power Status (0x0a) call unless otherwise noted. 1620 1621 0) Linux driver version (this will change if format changes) 1622 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1623 2) APM flags from APM Installation Check (0x00): 1624 bit 0: APM_16_BIT_SUPPORT 1625 bit 1: APM_32_BIT_SUPPORT 1626 bit 2: APM_IDLE_SLOWS_CLOCK 1627 bit 3: APM_BIOS_DISABLED 1628 bit 4: APM_BIOS_DISENGAGED 1629 3) AC line status 1630 0x00: Off-line 1631 0x01: On-line 1632 0x02: On backup power (BIOS >= 1.1 only) 1633 0xff: Unknown 1634 4) Battery status 1635 0x00: High 1636 0x01: Low 1637 0x02: Critical 1638 0x03: Charging 1639 0x04: Selected battery not present (BIOS >= 1.2 only) 1640 0xff: Unknown 1641 5) Battery flag 1642 bit 0: High 1643 bit 1: Low 1644 bit 2: Critical 1645 bit 3: Charging 1646 bit 7: No system battery 1647 0xff: Unknown 1648 6) Remaining battery life (percentage of charge): 1649 0-100: valid 1650 -1: Unknown 1651 7) Remaining battery life (time units): 1652 Number of remaining minutes or seconds 1653 -1: Unknown 1654 8) min = minutes; sec = seconds */ 1655 1656 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1657 driver_version, 1658 (apm_info.bios.version >> 8) & 0xff, 1659 apm_info.bios.version & 0xff, 1660 apm_info.bios.flags, 1661 ac_line_status, 1662 battery_status, 1663 battery_flag, 1664 percentage, 1665 time_units, 1666 units); 1667 return 0; 1668 } 1669 1670 static int proc_apm_open(struct inode *inode, struct file *file) 1671 { 1672 return single_open(file, proc_apm_show, NULL); 1673 } 1674 1675 static const struct file_operations apm_file_ops = { 1676 .owner = THIS_MODULE, 1677 .open = proc_apm_open, 1678 .read = seq_read, 1679 .llseek = seq_lseek, 1680 .release = single_release, 1681 }; 1682 1683 static int apm(void *unused) 1684 { 1685 unsigned short bx; 1686 unsigned short cx; 1687 unsigned short dx; 1688 int error; 1689 char *power_stat; 1690 char *bat_stat; 1691 1692 #ifdef CONFIG_SMP 1693 /* 2002/08/01 - WT 1694 * This is to avoid random crashes at boot time during initialization 1695 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1696 * Some bioses don't like being called from CPU != 0. 1697 * Method suggested by Ingo Molnar. 1698 */ 1699 set_cpus_allowed(current, cpumask_of_cpu(0)); 1700 BUG_ON(smp_processor_id() != 0); 1701 #endif 1702 1703 if (apm_info.connection_version == 0) { 1704 apm_info.connection_version = apm_info.bios.version; 1705 if (apm_info.connection_version > 0x100) { 1706 /* 1707 * We only support BIOSs up to version 1.2 1708 */ 1709 if (apm_info.connection_version > 0x0102) 1710 apm_info.connection_version = 0x0102; 1711 error = apm_driver_version(&apm_info.connection_version); 1712 if (error != APM_SUCCESS) { 1713 apm_error("driver version", error); 1714 /* Fall back to an APM 1.0 connection. */ 1715 apm_info.connection_version = 0x100; 1716 } 1717 } 1718 } 1719 1720 if (debug) 1721 printk(KERN_INFO "apm: Connection version %d.%d\n", 1722 (apm_info.connection_version >> 8) & 0xff, 1723 apm_info.connection_version & 0xff); 1724 1725 #ifdef CONFIG_APM_DO_ENABLE 1726 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1727 /* 1728 * This call causes my NEC UltraLite Versa 33/C to hang if it 1729 * is booted with PM disabled but not in the docking station. 1730 * Unfortunate ... 1731 */ 1732 error = apm_enable_power_management(1); 1733 if (error) { 1734 apm_error("enable power management", error); 1735 return -1; 1736 } 1737 } 1738 #endif 1739 1740 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1741 && (apm_info.connection_version > 0x0100)) { 1742 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1743 if (error) { 1744 apm_error("engage power management", error); 1745 return -1; 1746 } 1747 } 1748 1749 if (debug && (num_online_cpus() == 1 || smp)) { 1750 error = apm_get_power_status(&bx, &cx, &dx); 1751 if (error) 1752 printk(KERN_INFO "apm: power status not available\n"); 1753 else { 1754 switch ((bx >> 8) & 0xff) { 1755 case 0: 1756 power_stat = "off line"; 1757 break; 1758 case 1: 1759 power_stat = "on line"; 1760 break; 1761 case 2: 1762 power_stat = "on backup power"; 1763 break; 1764 default: 1765 power_stat = "unknown"; 1766 break; 1767 } 1768 switch (bx & 0xff) { 1769 case 0: 1770 bat_stat = "high"; 1771 break; 1772 case 1: 1773 bat_stat = "low"; 1774 break; 1775 case 2: 1776 bat_stat = "critical"; 1777 break; 1778 case 3: 1779 bat_stat = "charging"; 1780 break; 1781 default: 1782 bat_stat = "unknown"; 1783 break; 1784 } 1785 printk(KERN_INFO 1786 "apm: AC %s, battery status %s, battery life ", 1787 power_stat, bat_stat); 1788 if ((cx & 0xff) == 0xff) 1789 printk("unknown\n"); 1790 else 1791 printk("%d%%\n", cx & 0xff); 1792 if (apm_info.connection_version > 0x100) { 1793 printk(KERN_INFO 1794 "apm: battery flag 0x%02x, battery life ", 1795 (cx >> 8) & 0xff); 1796 if (dx == 0xffff) 1797 printk("unknown\n"); 1798 else 1799 printk("%d %s\n", dx & 0x7fff, 1800 (dx & 0x8000) ? 1801 "minutes" : "seconds"); 1802 } 1803 } 1804 } 1805 1806 /* Install our power off handler.. */ 1807 if (power_off) 1808 pm_power_off = apm_power_off; 1809 1810 if (num_online_cpus() == 1 || smp) { 1811 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1812 console_blank_hook = apm_console_blank; 1813 #endif 1814 apm_mainloop(); 1815 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1816 console_blank_hook = NULL; 1817 #endif 1818 } 1819 1820 return 0; 1821 } 1822 1823 #ifndef MODULE 1824 static int __init apm_setup(char *str) 1825 { 1826 int invert; 1827 1828 while ((str != NULL) && (*str != '\0')) { 1829 if (strncmp(str, "off", 3) == 0) 1830 apm_disabled = 1; 1831 if (strncmp(str, "on", 2) == 0) 1832 apm_disabled = 0; 1833 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1834 (strncmp(str, "bounce_interval=", 16) == 0)) 1835 bounce_interval = simple_strtol(str + 16, NULL, 0); 1836 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1837 (strncmp(str, "idle_threshold=", 15) == 0)) 1838 idle_threshold = simple_strtol(str + 15, NULL, 0); 1839 if ((strncmp(str, "idle-period=", 12) == 0) || 1840 (strncmp(str, "idle_period=", 12) == 0)) 1841 idle_period = simple_strtol(str + 12, NULL, 0); 1842 invert = (strncmp(str, "no-", 3) == 0) || 1843 (strncmp(str, "no_", 3) == 0); 1844 if (invert) 1845 str += 3; 1846 if (strncmp(str, "debug", 5) == 0) 1847 debug = !invert; 1848 if ((strncmp(str, "power-off", 9) == 0) || 1849 (strncmp(str, "power_off", 9) == 0)) 1850 power_off = !invert; 1851 if (strncmp(str, "smp", 3) == 0) { 1852 smp = !invert; 1853 idle_threshold = 100; 1854 } 1855 if ((strncmp(str, "allow-ints", 10) == 0) || 1856 (strncmp(str, "allow_ints", 10) == 0)) 1857 apm_info.allow_ints = !invert; 1858 if ((strncmp(str, "broken-psr", 10) == 0) || 1859 (strncmp(str, "broken_psr", 10) == 0)) 1860 apm_info.get_power_status_broken = !invert; 1861 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1862 (strncmp(str, "realmode_power_off", 18) == 0)) 1863 apm_info.realmode_power_off = !invert; 1864 str = strchr(str, ','); 1865 if (str != NULL) 1866 str += strspn(str, ", \t"); 1867 } 1868 return 1; 1869 } 1870 1871 __setup("apm=", apm_setup); 1872 #endif 1873 1874 static const struct file_operations apm_bios_fops = { 1875 .owner = THIS_MODULE, 1876 .read = do_read, 1877 .poll = do_poll, 1878 .unlocked_ioctl = do_ioctl, 1879 .open = do_open, 1880 .release = do_release, 1881 }; 1882 1883 static struct miscdevice apm_device = { 1884 APM_MINOR_DEV, 1885 "apm_bios", 1886 &apm_bios_fops 1887 }; 1888 1889 1890 /* Simple "print if true" callback */ 1891 static int __init print_if_true(const struct dmi_system_id *d) 1892 { 1893 printk("%s\n", d->ident); 1894 return 0; 1895 } 1896 1897 /* 1898 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1899 * disabled before the suspend. Linux used to get terribly confused by that. 1900 */ 1901 static int __init broken_ps2_resume(const struct dmi_system_id *d) 1902 { 1903 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1904 "workaround hopefully not needed.\n", d->ident); 1905 return 0; 1906 } 1907 1908 /* Some bioses have a broken protected mode poweroff and need to use realmode */ 1909 static int __init set_realmode_power_off(const struct dmi_system_id *d) 1910 { 1911 if (apm_info.realmode_power_off == 0) { 1912 apm_info.realmode_power_off = 1; 1913 printk(KERN_INFO "%s bios detected. " 1914 "Using realmode poweroff only.\n", d->ident); 1915 } 1916 return 0; 1917 } 1918 1919 /* Some laptops require interrupts to be enabled during APM calls */ 1920 static int __init set_apm_ints(const struct dmi_system_id *d) 1921 { 1922 if (apm_info.allow_ints == 0) { 1923 apm_info.allow_ints = 1; 1924 printk(KERN_INFO "%s machine detected. " 1925 "Enabling interrupts during APM calls.\n", d->ident); 1926 } 1927 return 0; 1928 } 1929 1930 /* Some APM bioses corrupt memory or just plain do not work */ 1931 static int __init apm_is_horked(const struct dmi_system_id *d) 1932 { 1933 if (apm_info.disabled == 0) { 1934 apm_info.disabled = 1; 1935 printk(KERN_INFO "%s machine detected. " 1936 "Disabling APM.\n", d->ident); 1937 } 1938 return 0; 1939 } 1940 1941 static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1942 { 1943 if (apm_info.disabled == 0) { 1944 apm_info.disabled = 1; 1945 printk(KERN_INFO "%s machine detected. " 1946 "Disabling APM.\n", d->ident); 1947 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n"); 1948 printk(KERN_INFO "download from support.intel.com \n"); 1949 } 1950 return 0; 1951 } 1952 1953 /* Some APM bioses hang on APM idle calls */ 1954 static int __init apm_likes_to_melt(const struct dmi_system_id *d) 1955 { 1956 if (apm_info.forbid_idle == 0) { 1957 apm_info.forbid_idle = 1; 1958 printk(KERN_INFO "%s machine detected. " 1959 "Disabling APM idle calls.\n", d->ident); 1960 } 1961 return 0; 1962 } 1963 1964 /* 1965 * Check for clue free BIOS implementations who use 1966 * the following QA technique 1967 * 1968 * [ Write BIOS Code ]<------ 1969 * | ^ 1970 * < Does it Compile >----N-- 1971 * |Y ^ 1972 * < Does it Boot Win98 >-N-- 1973 * |Y 1974 * [Ship It] 1975 * 1976 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 1977 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 1978 */ 1979 static int __init broken_apm_power(const struct dmi_system_id *d) 1980 { 1981 apm_info.get_power_status_broken = 1; 1982 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 1983 "disabling power status reporting.\n"); 1984 return 0; 1985 } 1986 1987 /* 1988 * This bios swaps the APM minute reporting bytes over (Many sony laptops 1989 * have this problem). 1990 */ 1991 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 1992 { 1993 apm_info.get_power_status_swabinminutes = 1; 1994 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 1995 "in minutes and wrong byte order.\n"); 1996 return 0; 1997 } 1998 1999 static struct dmi_system_id __initdata apm_dmi_table[] = { 2000 { 2001 print_if_true, 2002 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2003 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2004 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2005 }, 2006 { /* Handle problems with APM on the C600 */ 2007 broken_ps2_resume, "Dell Latitude C600", 2008 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2009 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2010 }, 2011 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2012 set_apm_ints, "Dell Latitude", 2013 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2014 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2015 }, 2016 { /* APM crashes */ 2017 apm_is_horked, "Dell Inspiron 2500", 2018 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2019 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2020 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2021 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2022 }, 2023 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2024 set_apm_ints, "Dell Inspiron", { 2025 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2026 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2027 }, 2028 { /* Handle problems with APM on Inspiron 5000e */ 2029 broken_apm_power, "Dell Inspiron 5000e", 2030 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2031 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2032 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2033 }, 2034 { /* Handle problems with APM on Inspiron 2500 */ 2035 broken_apm_power, "Dell Inspiron 2500", 2036 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2037 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2038 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2039 }, 2040 { /* APM crashes */ 2041 apm_is_horked, "Dell Dimension 4100", 2042 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2043 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2044 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2045 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2046 }, 2047 { /* Allow interrupts during suspend on Compaq Laptops*/ 2048 set_apm_ints, "Compaq 12XL125", 2049 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2050 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2051 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2052 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2053 }, 2054 { /* Allow interrupts during APM or the clock goes slow */ 2055 set_apm_ints, "ASUSTeK", 2056 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2057 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2058 }, 2059 { /* APM blows on shutdown */ 2060 apm_is_horked, "ABIT KX7-333[R]", 2061 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2062 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2063 }, 2064 { /* APM crashes */ 2065 apm_is_horked, "Trigem Delhi3", 2066 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2067 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2068 }, 2069 { /* APM crashes */ 2070 apm_is_horked, "Fujitsu-Siemens", 2071 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2072 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2073 }, 2074 { /* APM crashes */ 2075 apm_is_horked_d850md, "Intel D850MD", 2076 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2077 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2078 }, 2079 { /* APM crashes */ 2080 apm_is_horked, "Intel D810EMO", 2081 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2082 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2083 }, 2084 { /* APM crashes */ 2085 apm_is_horked, "Dell XPS-Z", 2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2087 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2088 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2089 }, 2090 { /* APM crashes */ 2091 apm_is_horked, "Sharp PC-PJ/AX", 2092 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2093 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2094 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2095 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2096 }, 2097 { /* APM crashes */ 2098 apm_is_horked, "Dell Inspiron 2500", 2099 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2100 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2101 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2102 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2103 }, 2104 { /* APM idle hangs */ 2105 apm_likes_to_melt, "Jabil AMD", 2106 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2107 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2108 }, 2109 { /* APM idle hangs */ 2110 apm_likes_to_melt, "AMI Bios", 2111 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2112 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2113 }, 2114 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2115 swab_apm_power_in_minutes, "Sony VAIO", 2116 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2117 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2118 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2119 }, 2120 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2121 swab_apm_power_in_minutes, "Sony VAIO", 2122 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2123 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2124 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2125 }, 2126 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2127 swab_apm_power_in_minutes, "Sony VAIO", 2128 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2129 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2130 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2131 }, 2132 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2133 swab_apm_power_in_minutes, "Sony VAIO", 2134 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2135 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2136 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2137 }, 2138 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2139 swab_apm_power_in_minutes, "Sony VAIO", 2140 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2141 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2142 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2143 }, 2144 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2145 swab_apm_power_in_minutes, "Sony VAIO", 2146 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2147 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2148 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2149 }, 2150 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2151 swab_apm_power_in_minutes, "Sony VAIO", 2152 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2153 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2154 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2155 }, 2156 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2157 swab_apm_power_in_minutes, "Sony VAIO", 2158 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2159 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2160 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2161 }, 2162 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2163 swab_apm_power_in_minutes, "Sony VAIO", 2164 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2165 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2166 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2167 }, 2168 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2169 swab_apm_power_in_minutes, "Sony VAIO", 2170 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2171 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2172 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2173 }, 2174 2175 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2176 swab_apm_power_in_minutes, "Sony VAIO", 2177 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2178 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2179 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2180 }, 2181 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2182 swab_apm_power_in_minutes, "Sony VAIO", 2183 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2184 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2185 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2186 }, 2187 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2188 swab_apm_power_in_minutes, "Sony VAIO", 2189 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2190 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2191 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2192 }, 2193 { /* broken PM poweroff bios */ 2194 set_realmode_power_off, "Award Software v4.60 PGMA", 2195 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2196 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2197 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2198 }, 2199 2200 /* Generic per vendor APM settings */ 2201 2202 { /* Allow interrupts during suspend on IBM laptops */ 2203 set_apm_ints, "IBM", 2204 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2205 }, 2206 2207 { } 2208 }; 2209 2210 /* 2211 * Just start the APM thread. We do NOT want to do APM BIOS 2212 * calls from anything but the APM thread, if for no other reason 2213 * than the fact that we don't trust the APM BIOS. This way, 2214 * most common APM BIOS problems that lead to protection errors 2215 * etc will have at least some level of being contained... 2216 * 2217 * In short, if something bad happens, at least we have a choice 2218 * of just killing the apm thread.. 2219 */ 2220 static int __init apm_init(void) 2221 { 2222 struct desc_struct *gdt; 2223 int err; 2224 2225 dmi_check_system(apm_dmi_table); 2226 2227 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { 2228 printk(KERN_INFO "apm: BIOS not found.\n"); 2229 return -ENODEV; 2230 } 2231 printk(KERN_INFO 2232 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2233 ((apm_info.bios.version >> 8) & 0xff), 2234 (apm_info.bios.version & 0xff), 2235 apm_info.bios.flags, 2236 driver_version); 2237 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2238 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2239 return -ENODEV; 2240 } 2241 2242 if (allow_ints) 2243 apm_info.allow_ints = 1; 2244 if (broken_psr) 2245 apm_info.get_power_status_broken = 1; 2246 if (realmode_power_off) 2247 apm_info.realmode_power_off = 1; 2248 /* User can override, but default is to trust DMI */ 2249 if (apm_disabled != -1) 2250 apm_info.disabled = apm_disabled; 2251 2252 /* 2253 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2254 * but is reportedly a 1.0 BIOS. 2255 */ 2256 if (apm_info.bios.version == 0x001) 2257 apm_info.bios.version = 0x100; 2258 2259 /* BIOS < 1.2 doesn't set cseg_16_len */ 2260 if (apm_info.bios.version < 0x102) 2261 apm_info.bios.cseg_16_len = 0; /* 64k */ 2262 2263 if (debug) { 2264 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2265 apm_info.bios.cseg, apm_info.bios.offset, 2266 apm_info.bios.cseg_16, apm_info.bios.dseg); 2267 if (apm_info.bios.version > 0x100) 2268 printk(" cseg len %x, dseg len %x", 2269 apm_info.bios.cseg_len, 2270 apm_info.bios.dseg_len); 2271 if (apm_info.bios.version > 0x101) 2272 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2273 printk("\n"); 2274 } 2275 2276 if (apm_info.disabled) { 2277 printk(KERN_NOTICE "apm: disabled on user request.\n"); 2278 return -ENODEV; 2279 } 2280 if ((num_online_cpus() > 1) && !power_off && !smp) { 2281 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n"); 2282 apm_info.disabled = 1; 2283 return -ENODEV; 2284 } 2285 if (pm_flags & PM_ACPI) { 2286 printk(KERN_NOTICE "apm: overridden by ACPI.\n"); 2287 apm_info.disabled = 1; 2288 return -ENODEV; 2289 } 2290 pm_flags |= PM_APM; 2291 2292 /* 2293 * Set up a segment that references the real mode segment 0x40 2294 * that extends up to the end of page zero (that we have reserved). 2295 * This is for buggy BIOS's that refer to (real mode) segment 0x40 2296 * even though they are called in protected mode. 2297 */ 2298 set_base(bad_bios_desc, __va((unsigned long)0x40 << 4)); 2299 _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); 2300 2301 /* 2302 * Set up the long jump entry point to the APM BIOS, which is called 2303 * from inline assembly. 2304 */ 2305 apm_bios_entry.offset = apm_info.bios.offset; 2306 apm_bios_entry.segment = APM_CS; 2307 2308 /* 2309 * The APM 1.1 BIOS is supposed to provide limit information that it 2310 * recognizes. Many machines do this correctly, but many others do 2311 * not restrict themselves to their claimed limit. When this happens, 2312 * they will cause a segmentation violation in the kernel at boot time. 2313 * Most BIOS's, however, will respect a 64k limit, so we use that. 2314 * 2315 * Note we only set APM segments on CPU zero, since we pin the APM 2316 * code to that CPU. 2317 */ 2318 gdt = get_cpu_gdt_table(0); 2319 set_base(gdt[APM_CS >> 3], 2320 __va((unsigned long)apm_info.bios.cseg << 4)); 2321 set_base(gdt[APM_CS_16 >> 3], 2322 __va((unsigned long)apm_info.bios.cseg_16 << 4)); 2323 set_base(gdt[APM_DS >> 3], 2324 __va((unsigned long)apm_info.bios.dseg << 4)); 2325 2326 proc_create("apm", 0, NULL, &apm_file_ops); 2327 2328 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2329 if (IS_ERR(kapmd_task)) { 2330 printk(KERN_ERR "apm: disabled - Unable to start kernel " 2331 "thread.\n"); 2332 err = PTR_ERR(kapmd_task); 2333 kapmd_task = NULL; 2334 remove_proc_entry("apm", NULL); 2335 return err; 2336 } 2337 wake_up_process(kapmd_task); 2338 2339 if (num_online_cpus() > 1 && !smp) { 2340 printk(KERN_NOTICE 2341 "apm: disabled - APM is not SMP safe (power off active).\n"); 2342 return 0; 2343 } 2344 2345 /* 2346 * Note we don't actually care if the misc_device cannot be registered. 2347 * this driver can do its job without it, even if userspace can't 2348 * control it. just log the error 2349 */ 2350 if (misc_register(&apm_device)) 2351 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2352 2353 if (HZ != 100) 2354 idle_period = (idle_period * HZ) / 100; 2355 if (idle_threshold < 100) { 2356 original_pm_idle = pm_idle; 2357 pm_idle = apm_cpu_idle; 2358 set_pm_idle = 1; 2359 } 2360 2361 return 0; 2362 } 2363 2364 static void __exit apm_exit(void) 2365 { 2366 int error; 2367 2368 if (set_pm_idle) { 2369 pm_idle = original_pm_idle; 2370 /* 2371 * We are about to unload the current idle thread pm callback 2372 * (pm_idle), Wait for all processors to update cached/local 2373 * copies of pm_idle before proceeding. 2374 */ 2375 cpu_idle_wait(); 2376 } 2377 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) 2378 && (apm_info.connection_version > 0x0100)) { 2379 error = apm_engage_power_management(APM_DEVICE_ALL, 0); 2380 if (error) 2381 apm_error("disengage power management", error); 2382 } 2383 misc_deregister(&apm_device); 2384 remove_proc_entry("apm", NULL); 2385 if (power_off) 2386 pm_power_off = NULL; 2387 if (kapmd_task) { 2388 kthread_stop(kapmd_task); 2389 kapmd_task = NULL; 2390 } 2391 pm_flags &= ~PM_APM; 2392 } 2393 2394 module_init(apm_init); 2395 module_exit(apm_exit); 2396 2397 MODULE_AUTHOR("Stephen Rothwell"); 2398 MODULE_DESCRIPTION("Advanced Power Management"); 2399 MODULE_LICENSE("GPL"); 2400 module_param(debug, bool, 0644); 2401 MODULE_PARM_DESC(debug, "Enable debug mode"); 2402 module_param(power_off, bool, 0444); 2403 MODULE_PARM_DESC(power_off, "Enable power off"); 2404 module_param(bounce_interval, int, 0444); 2405 MODULE_PARM_DESC(bounce_interval, 2406 "Set the number of ticks to ignore suspend bounces"); 2407 module_param(allow_ints, bool, 0444); 2408 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2409 module_param(broken_psr, bool, 0444); 2410 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2411 module_param(realmode_power_off, bool, 0444); 2412 MODULE_PARM_DESC(realmode_power_off, 2413 "Switch to real mode before powering off"); 2414 module_param(idle_threshold, int, 0444); 2415 MODULE_PARM_DESC(idle_threshold, 2416 "System idle percentage above which to make APM BIOS idle calls"); 2417 module_param(idle_period, int, 0444); 2418 MODULE_PARM_DESC(idle_period, 2419 "Period (in sec/100) over which to caculate the idle percentage"); 2420 module_param(smp, bool, 0444); 2421 MODULE_PARM_DESC(smp, 2422 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2423 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2424