1 /* -*- linux-c -*- 2 * APM BIOS driver for Linux 3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au) 4 * 5 * Initial development of this driver was funded by NEC Australia P/L 6 * and NEC Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2, or (at your option) any 11 * later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * October 1995, Rik Faith (faith@cs.unc.edu): 19 * Minor enhancements and updates (to the patch set) for 1.3.x 20 * Documentation 21 * January 1996, Rik Faith (faith@cs.unc.edu): 22 * Make /proc/apm easy to format (bump driver version) 23 * March 1996, Rik Faith (faith@cs.unc.edu): 24 * Prohibit APM BIOS calls unless apm_enabled. 25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>) 26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au) 27 * Version 1.0 and 1.1 28 * May 1996, Version 1.2 29 * Feb 1998, Version 1.3 30 * Feb 1998, Version 1.4 31 * Aug 1998, Version 1.5 32 * Sep 1998, Version 1.6 33 * Nov 1998, Version 1.7 34 * Jan 1999, Version 1.8 35 * Jan 1999, Version 1.9 36 * Oct 1999, Version 1.10 37 * Nov 1999, Version 1.11 38 * Jan 2000, Version 1.12 39 * Feb 2000, Version 1.13 40 * Nov 2000, Version 1.14 41 * Oct 2001, Version 1.15 42 * Jan 2002, Version 1.16 43 * Oct 2002, Version 1.16ac 44 * 45 * History: 46 * 0.6b: first version in official kernel, Linux 1.3.46 47 * 0.7: changed /proc/apm format, Linux 1.3.58 48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59 49 * 0.9: only call bios if bios is present, Linux 1.3.72 50 * 1.0: use fixed device number, consolidate /proc/apm into this file, 51 * Linux 1.3.85 52 * 1.1: support user-space standby and suspend, power off after system 53 * halted, Linux 1.3.98 54 * 1.2: When resetting RTC after resume, take care so that the time 55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth 56 * <jtoth@princeton.edu>); improve interaction between 57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4 58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added 59 * levels to the printk calls. APM is not defined for SMP machines. 60 * The new replacement for it is, but Linux doesn't yet support this. 61 * Alan Cox Linux 2.1.55 62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's 63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by 64 * Dean Gaudet <dgaudet@arctic.org>. 65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87 66 * 1.5: Fix segment register reloading (in case of bad segments saved 67 * across BIOS call). 68 * Stephen Rothwell 69 * 1.6: Cope with compiler/assembler differences. 70 * Only try to turn off the first display device. 71 * Fix OOPS at power off with no APM BIOS by Jan Echternach 72 * <echter@informatik.uni-rostock.de> 73 * Stephen Rothwell 74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags 75 * to reflect current state of APM BIOS. 76 * Chris Rankin <rankinc@bellsouth.net> 77 * Reset interrupt 0 timer to 100Hz after suspend 78 * Chad Miller <cmiller@surfsouth.com> 79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE 80 * Richard Gooch <rgooch@atnf.csiro.au> 81 * Allow boot time disabling of APM 82 * Make boot messages far less verbose by default 83 * Make asm safer 84 * Stephen Rothwell 85 * 1.8: Add CONFIG_APM_RTC_IS_GMT 86 * Richard Gooch <rgooch@atnf.csiro.au> 87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS 88 * remove dependency on CONFIG_PROC_FS 89 * Stephen Rothwell 90 * 1.9: Fix small typo. <laslo@wodip.opole.pl> 91 * Try to cope with BIOS's that need to have all display 92 * devices blanked and not just the first one. 93 * Ross Paterson <ross@soi.city.ac.uk> 94 * Fix segment limit setting it has always been wrong as 95 * the segments needed to have byte granularity. 96 * Mark a few things __init. 97 * Add hack to allow power off of SMP systems by popular request. 98 * Use CONFIG_SMP instead of __SMP__ 99 * Ignore BOUNCES for three seconds. 100 * Stephen Rothwell 101 * 1.10: Fix for Thinkpad return code. 102 * Merge 2.2 and 2.3 drivers. 103 * Remove APM dependencies in arch/i386/kernel/process.c 104 * Remove APM dependencies in drivers/char/sysrq.c 105 * Reset time across standby. 106 * Allow more inititialisation on SMP. 107 * Remove CONFIG_APM_POWER_OFF and make it boot time 108 * configurable (default on). 109 * Make debug only a boot time parameter (remove APM_DEBUG). 110 * Try to blank all devices on any error. 111 * 1.11: Remove APM dependencies in drivers/char/console.c 112 * Check nr_running to detect if we are idle (from 113 * Borislav Deianov <borislav@lix.polytechnique.fr>) 114 * Fix for bioses that don't zero the top part of the 115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>) 116 * (reported by Panos Katsaloulis <teras@writeme.com>). 117 * Real mode power off patch (Walter Hofmann 118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>). 119 * 1.12: Remove CONFIG_SMP as the compiler will optimize 120 * the code away anyway (smp_num_cpus == 1 in UP) 121 * noted by Artur Skawina <skawina@geocities.com>. 122 * Make power off under SMP work again. 123 * Fix thinko with initial engaging of BIOS. 124 * Make sure power off only happens on CPU 0 125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>). 126 * Do error notification to user mode if BIOS calls fail. 127 * Move entrypoint offset fix to ...boot/setup.S 128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>). 129 * Remove smp-power-off. SMP users must now specify 130 * "apm=power-off" on the kernel command line. Suggested 131 * by Jim Avera <jima@hal.com>, modified by Alan Cox 132 * <alan@lxorguk.ukuu.org.uk>. 133 * Register the /proc/apm entry even on SMP so that 134 * scripts that check for it before doing power off 135 * work (Jim Avera <jima@hal.com>). 136 * 1.13: Changes for new pm_ interfaces (Andy Henroid 137 * <andy_henroid@yahoo.com>). 138 * Modularize the code. 139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS 140 * is now the way life works). 141 * Fix thinko in suspend() (wrong return). 142 * Notify drivers on critical suspend. 143 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz> 144 * modified by sfr). 145 * Disable interrupts while we are suspended (Andy Henroid 146 * <andy_henroid@yahoo.com> fixed by sfr). 147 * Make power off work on SMP again (Tony Hoyle 148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr. 149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore 150 * interval is now configurable. 151 * 1.14: Make connection version persist across module unload/load. 152 * Enable and engage power management earlier. 153 * Disengage power management on module unload. 154 * Changed to use the sysrq-register hack for registering the 155 * power off function called by magic sysrq based upon discussions 156 * in irc://irc.openprojects.net/#kernelnewbies 157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>). 158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable. 159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr. 160 * Work around byte swap bug in one of the Vaio's BIOS's 161 * (Marc Boucher <marc@mbsi.ca>). 162 * Exposed the disable flag to dmi so that we can handle known 163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). 164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin 165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) 166 * If an APM idle fails log it and idle sensibly 167 * 1.15: Don't queue events to clients who open the device O_WRONLY. 168 * Don't expect replies from clients who open the device O_RDONLY. 169 * (Idea from Thomas Hood) 170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>) 171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.) 172 * Notify listeners of standby or suspend events before notifying 173 * drivers. Return EBUSY to ioctl() if suspend is rejected. 174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood) 175 * Ignore first resume after we generate our own resume event 176 * after a suspend (Thomas Hood) 177 * Daemonize now gets rid of our controlling terminal (sfr). 178 * CONFIG_APM_CPU_IDLE now just affects the default value of 179 * idle_threshold (sfr). 180 * Change name of kernel apm daemon (as it no longer idles) (sfr). 181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we 182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. 183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. 184 * 185 * APM 1.1 Reference: 186 * 187 * Intel Corporation, Microsoft Corporation. Advanced Power Management 188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993. 189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01. 190 * 191 * [This document is available free from Intel by calling 800.628.8686 (fax 192 * 916.356.6100) or 800.548.4725; or from 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also 194 * available from Microsoft by calling 206.882.8080.] 195 * 196 * APM 1.2 Reference: 197 * Intel Corporation, Microsoft Corporation. Advanced Power Management 198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996. 199 * 200 * [This document is available from Microsoft at: 201 * http://www.microsoft.com/whdc/archive/amp_12.mspx] 202 */ 203 204 #define pr_fmt(fmt) "apm: " fmt 205 206 #include <linux/module.h> 207 208 #include <linux/poll.h> 209 #include <linux/types.h> 210 #include <linux/stddef.h> 211 #include <linux/timer.h> 212 #include <linux/fcntl.h> 213 #include <linux/slab.h> 214 #include <linux/stat.h> 215 #include <linux/proc_fs.h> 216 #include <linux/seq_file.h> 217 #include <linux/miscdevice.h> 218 #include <linux/apm_bios.h> 219 #include <linux/init.h> 220 #include <linux/time.h> 221 #include <linux/sched/signal.h> 222 #include <linux/sched/cputime.h> 223 #include <linux/pm.h> 224 #include <linux/capability.h> 225 #include <linux/device.h> 226 #include <linux/kernel.h> 227 #include <linux/freezer.h> 228 #include <linux/smp.h> 229 #include <linux/dmi.h> 230 #include <linux/suspend.h> 231 #include <linux/kthread.h> 232 #include <linux/jiffies.h> 233 #include <linux/acpi.h> 234 #include <linux/syscore_ops.h> 235 #include <linux/i8253.h> 236 #include <linux/cpuidle.h> 237 238 #include <linux/uaccess.h> 239 #include <asm/desc.h> 240 #include <asm/olpc.h> 241 #include <asm/paravirt.h> 242 #include <asm/reboot.h> 243 244 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 245 extern int (*console_blank_hook)(int); 246 #endif 247 248 /* 249 * The apm_bios device is one of the misc char devices. 250 * This is its minor number. 251 */ 252 #define APM_MINOR_DEV 134 253 254 /* 255 * Various options can be changed at boot time as follows: 256 * (We allow underscores for compatibility with the modules code) 257 * apm=on/off enable/disable APM 258 * [no-]allow[-_]ints allow interrupts during BIOS calls 259 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call 260 * [no-]realmode[-_]power[-_]off switch to real mode before 261 * powering off 262 * [no-]debug log some debugging messages 263 * [no-]power[-_]off power off on shutdown 264 * [no-]smp Use apm even on an SMP box 265 * bounce[-_]interval=<n> number of ticks to ignore suspend 266 * bounces 267 * idle[-_]threshold=<n> System idle percentage above which to 268 * make APM BIOS idle calls. Set it to 269 * 100 to disable. 270 * idle[-_]period=<n> Period (in 1/100s of a second) over 271 * which the idle percentage is 272 * calculated. 273 */ 274 275 /* KNOWN PROBLEM MACHINES: 276 * 277 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant 278 * [Confirmed by TI representative] 279 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification 280 * [Confirmed by BIOS disassembly] 281 * [This may work now ...] 282 * P: Toshiba 1950S: battery life information only gets updated after resume 283 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking 284 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] 285 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP 286 * Neale Banks <neale@lowendale.com.au> December 2000 287 * 288 * Legend: U = unusable with APM patches 289 * P = partially usable with APM patches 290 */ 291 292 /* 293 * Define as 1 to make the driver always call the APM BIOS busy 294 * routine even if the clock was not reported as slowed by the 295 * idle routine. Otherwise, define as 0. 296 */ 297 #define ALWAYS_CALL_BUSY 1 298 299 /* 300 * Define to make the APM BIOS calls zero all data segment registers (so 301 * that an incorrect BIOS implementation will cause a kernel panic if it 302 * tries to write to arbitrary memory). 303 */ 304 #define APM_ZERO_SEGS 305 306 #include <asm/apm.h> 307 308 /* 309 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. 310 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by 311 * David Chen <chen@ctpa04.mit.edu> 312 */ 313 #undef INIT_TIMER_AFTER_SUSPEND 314 315 #ifdef INIT_TIMER_AFTER_SUSPEND 316 #include <linux/timex.h> 317 #include <asm/io.h> 318 #include <linux/delay.h> 319 #endif 320 321 /* 322 * Need to poll the APM BIOS every second 323 */ 324 #define APM_CHECK_TIMEOUT (HZ) 325 326 /* 327 * Ignore suspend events for this amount of time after a resume 328 */ 329 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) 330 331 /* 332 * Maximum number of events stored 333 */ 334 #define APM_MAX_EVENTS 20 335 336 /* 337 * The per-file APM data 338 */ 339 struct apm_user { 340 int magic; 341 struct apm_user *next; 342 unsigned int suser: 1; 343 unsigned int writer: 1; 344 unsigned int reader: 1; 345 unsigned int suspend_wait: 1; 346 int suspend_result; 347 int suspends_pending; 348 int standbys_pending; 349 int suspends_read; 350 int standbys_read; 351 int event_head; 352 int event_tail; 353 apm_event_t events[APM_MAX_EVENTS]; 354 }; 355 356 /* 357 * The magic number in apm_user 358 */ 359 #define APM_BIOS_MAGIC 0x4101 360 361 /* 362 * idle percentage above which bios idle calls are done 363 */ 364 #ifdef CONFIG_APM_CPU_IDLE 365 #define DEFAULT_IDLE_THRESHOLD 95 366 #else 367 #define DEFAULT_IDLE_THRESHOLD 100 368 #endif 369 #define DEFAULT_IDLE_PERIOD (100 / 3) 370 371 static int apm_cpu_idle(struct cpuidle_device *dev, 372 struct cpuidle_driver *drv, int index); 373 374 static struct cpuidle_driver apm_idle_driver = { 375 .name = "apm_idle", 376 .owner = THIS_MODULE, 377 .states = { 378 { /* entry 0 is for polling */ }, 379 { /* entry 1 is for APM idle */ 380 .name = "APM", 381 .desc = "APM idle", 382 .exit_latency = 250, /* WAG */ 383 .target_residency = 500, /* WAG */ 384 .enter = &apm_cpu_idle 385 }, 386 }, 387 .state_count = 2, 388 }; 389 390 static struct cpuidle_device apm_cpuidle_device; 391 392 /* 393 * Local variables 394 */ 395 __visible struct { 396 unsigned long offset; 397 unsigned short segment; 398 } apm_bios_entry; 399 static int clock_slowed; 400 static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; 401 static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; 402 static int suspends_pending; 403 static int standbys_pending; 404 static int ignore_sys_suspend; 405 static int ignore_normal_resume; 406 static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; 407 408 static bool debug __read_mostly; 409 static bool smp __read_mostly; 410 static int apm_disabled = -1; 411 #ifdef CONFIG_SMP 412 static bool power_off; 413 #else 414 static bool power_off = 1; 415 #endif 416 static bool realmode_power_off; 417 #ifdef CONFIG_APM_ALLOW_INTS 418 static bool allow_ints = 1; 419 #else 420 static bool allow_ints; 421 #endif 422 static bool broken_psr; 423 424 static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); 425 static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); 426 static struct apm_user *user_list; 427 static DEFINE_SPINLOCK(user_list_lock); 428 static DEFINE_MUTEX(apm_mutex); 429 430 /* 431 * Set up a segment that references the real mode segment 0x40 432 * that extends up to the end of page zero (that we have reserved). 433 * This is for buggy BIOS's that refer to (real mode) segment 0x40 434 * even though they are called in protected mode. 435 */ 436 static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, 437 (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); 438 439 static const char driver_version[] = "1.16ac"; /* no spaces */ 440 441 static struct task_struct *kapmd_task; 442 443 /* 444 * APM event names taken from the APM 1.2 specification. These are 445 * the message codes that the BIOS uses to tell us about events 446 */ 447 static const char * const apm_event_name[] = { 448 "system standby", 449 "system suspend", 450 "normal resume", 451 "critical resume", 452 "low battery", 453 "power status change", 454 "update time", 455 "critical suspend", 456 "user standby", 457 "user suspend", 458 "system standby resume", 459 "capabilities change" 460 }; 461 #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) 462 463 typedef struct lookup_t { 464 int key; 465 char *msg; 466 } lookup_t; 467 468 /* 469 * The BIOS returns a set of standard error codes in AX when the 470 * carry flag is set. 471 */ 472 473 static const lookup_t error_table[] = { 474 /* N/A { APM_SUCCESS, "Operation succeeded" }, */ 475 { APM_DISABLED, "Power management disabled" }, 476 { APM_CONNECTED, "Real mode interface already connected" }, 477 { APM_NOT_CONNECTED, "Interface not connected" }, 478 { APM_16_CONNECTED, "16 bit interface already connected" }, 479 /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ 480 { APM_32_CONNECTED, "32 bit interface already connected" }, 481 { APM_32_UNSUPPORTED, "32 bit interface not supported" }, 482 { APM_BAD_DEVICE, "Unrecognized device ID" }, 483 { APM_BAD_PARAM, "Parameter out of range" }, 484 { APM_NOT_ENGAGED, "Interface not engaged" }, 485 { APM_BAD_FUNCTION, "Function not supported" }, 486 { APM_RESUME_DISABLED, "Resume timer disabled" }, 487 { APM_BAD_STATE, "Unable to enter requested state" }, 488 /* N/A { APM_NO_EVENTS, "No events pending" }, */ 489 { APM_NO_ERROR, "BIOS did not set a return code" }, 490 { APM_NOT_PRESENT, "No APM present" } 491 }; 492 #define ERROR_COUNT ARRAY_SIZE(error_table) 493 494 /** 495 * apm_error - display an APM error 496 * @str: information string 497 * @err: APM BIOS return code 498 * 499 * Write a meaningful log entry to the kernel log in the event of 500 * an APM error. Note that this also handles (negative) kernel errors. 501 */ 502 503 static void apm_error(char *str, int err) 504 { 505 int i; 506 507 for (i = 0; i < ERROR_COUNT; i++) 508 if (error_table[i].key == err) 509 break; 510 if (i < ERROR_COUNT) 511 pr_notice("%s: %s\n", str, error_table[i].msg); 512 else if (err < 0) 513 pr_notice("%s: linux error code %i\n", str, err); 514 else 515 pr_notice("%s: unknown error code %#2.2x\n", 516 str, err); 517 } 518 519 /* 520 * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and 521 * apm_info.allow_ints, we are being really paranoid here! Not only 522 * are interrupts disabled, but all the segment registers (except SS) 523 * are saved and zeroed this means that if the BIOS tries to reference 524 * any data without explicitly loading the segment registers, the kernel 525 * will fault immediately rather than have some unforeseen circumstances 526 * for the rest of the kernel. And it will be very obvious! :-) Doing 527 * this depends on CS referring to the same physical memory as DS so that 528 * DS can be zeroed before the call. Unfortunately, we can't do anything 529 * about the stack segment/pointer. Also, we tell the compiler that 530 * everything could change. 531 * 532 * Also, we KNOW that for the non error case of apm_bios_call, there 533 * is no useful data returned in the low order 8 bits of eax. 534 */ 535 536 static inline unsigned long __apm_irq_save(void) 537 { 538 unsigned long flags; 539 local_save_flags(flags); 540 if (apm_info.allow_ints) { 541 if (irqs_disabled_flags(flags)) 542 local_irq_enable(); 543 } else 544 local_irq_disable(); 545 546 return flags; 547 } 548 549 #define apm_irq_save(flags) \ 550 do { flags = __apm_irq_save(); } while (0) 551 552 static inline void apm_irq_restore(unsigned long flags) 553 { 554 if (irqs_disabled_flags(flags)) 555 local_irq_disable(); 556 else if (irqs_disabled()) 557 local_irq_enable(); 558 } 559 560 #ifdef APM_ZERO_SEGS 561 # define APM_DECL_SEGS \ 562 unsigned int saved_fs; unsigned int saved_gs; 563 # define APM_DO_SAVE_SEGS \ 564 savesegment(fs, saved_fs); savesegment(gs, saved_gs) 565 # define APM_DO_RESTORE_SEGS \ 566 loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) 567 #else 568 # define APM_DECL_SEGS 569 # define APM_DO_SAVE_SEGS 570 # define APM_DO_RESTORE_SEGS 571 #endif 572 573 struct apm_bios_call { 574 u32 func; 575 /* In and out */ 576 u32 ebx; 577 u32 ecx; 578 /* Out only */ 579 u32 eax; 580 u32 edx; 581 u32 esi; 582 583 /* Error: -ENOMEM, or bits 8-15 of eax */ 584 int err; 585 }; 586 587 /** 588 * __apm_bios_call - Make an APM BIOS 32bit call 589 * @_call: pointer to struct apm_bios_call. 590 * 591 * Make an APM call using the 32bit protected mode interface. The 592 * caller is responsible for knowing if APM BIOS is configured and 593 * enabled. This call can disable interrupts for a long period of 594 * time on some laptops. The return value is in AH and the carry 595 * flag is loaded into AL. If there is an error, then the error 596 * code is returned in AH (bits 8-15 of eax) and this function 597 * returns non-zero. 598 * 599 * Note: this makes the call on the current CPU. 600 */ 601 static long __apm_bios_call(void *_call) 602 { 603 APM_DECL_SEGS 604 unsigned long flags; 605 int cpu; 606 struct desc_struct save_desc_40; 607 struct desc_struct *gdt; 608 struct apm_bios_call *call = _call; 609 610 cpu = get_cpu(); 611 BUG_ON(cpu != 0); 612 gdt = get_cpu_gdt_rw(cpu); 613 save_desc_40 = gdt[0x40 / 8]; 614 gdt[0x40 / 8] = bad_bios_desc; 615 616 apm_irq_save(flags); 617 APM_DO_SAVE_SEGS; 618 apm_bios_call_asm(call->func, call->ebx, call->ecx, 619 &call->eax, &call->ebx, &call->ecx, &call->edx, 620 &call->esi); 621 APM_DO_RESTORE_SEGS; 622 apm_irq_restore(flags); 623 gdt[0x40 / 8] = save_desc_40; 624 put_cpu(); 625 626 return call->eax & 0xff; 627 } 628 629 /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ 630 static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) 631 { 632 int ret; 633 634 /* Don't bother with work_on_cpu in the common case, so we don't 635 * have to worry about OOM or overhead. */ 636 if (get_cpu() == 0) { 637 ret = fn(call); 638 put_cpu(); 639 } else { 640 put_cpu(); 641 ret = work_on_cpu(0, fn, call); 642 } 643 644 /* work_on_cpu can fail with -ENOMEM */ 645 if (ret < 0) 646 call->err = ret; 647 else 648 call->err = (call->eax >> 8) & 0xff; 649 650 return ret; 651 } 652 653 /** 654 * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) 655 * @call: the apm_bios_call registers. 656 * 657 * If there is an error, it is returned in @call.err. 658 */ 659 static int apm_bios_call(struct apm_bios_call *call) 660 { 661 return on_cpu0(__apm_bios_call, call); 662 } 663 664 /** 665 * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) 666 * @_call: pointer to struct apm_bios_call. 667 * 668 * Make a BIOS call that returns one value only, or just status. 669 * If there is an error, then the error code is returned in AH 670 * (bits 8-15 of eax) and this function returns non-zero (it can 671 * also return -ENOMEM). This is used for simpler BIOS operations. 672 * This call may hold interrupts off for a long time on some laptops. 673 * 674 * Note: this makes the call on the current CPU. 675 */ 676 static long __apm_bios_call_simple(void *_call) 677 { 678 u8 error; 679 APM_DECL_SEGS 680 unsigned long flags; 681 int cpu; 682 struct desc_struct save_desc_40; 683 struct desc_struct *gdt; 684 struct apm_bios_call *call = _call; 685 686 cpu = get_cpu(); 687 BUG_ON(cpu != 0); 688 gdt = get_cpu_gdt_rw(cpu); 689 save_desc_40 = gdt[0x40 / 8]; 690 gdt[0x40 / 8] = bad_bios_desc; 691 692 apm_irq_save(flags); 693 APM_DO_SAVE_SEGS; 694 error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, 695 &call->eax); 696 APM_DO_RESTORE_SEGS; 697 apm_irq_restore(flags); 698 gdt[0x40 / 8] = save_desc_40; 699 put_cpu(); 700 return error; 701 } 702 703 /** 704 * apm_bios_call_simple - make a simple APM BIOS 32bit call 705 * @func: APM function to invoke 706 * @ebx_in: EBX register value for BIOS call 707 * @ecx_in: ECX register value for BIOS call 708 * @eax: EAX register on return from the BIOS call 709 * @err: bits 710 * 711 * Make a BIOS call that returns one value only, or just status. 712 * If there is an error, then the error code is returned in @err 713 * and this function returns non-zero. This is used for simpler 714 * BIOS operations. This call may hold interrupts off for a long 715 * time on some laptops. 716 */ 717 static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, 718 int *err) 719 { 720 struct apm_bios_call call; 721 int ret; 722 723 call.func = func; 724 call.ebx = ebx_in; 725 call.ecx = ecx_in; 726 727 ret = on_cpu0(__apm_bios_call_simple, &call); 728 *eax = call.eax; 729 *err = call.err; 730 return ret; 731 } 732 733 /** 734 * apm_driver_version - APM driver version 735 * @val: loaded with the APM version on return 736 * 737 * Retrieve the APM version supported by the BIOS. This is only 738 * supported for APM 1.1 or higher. An error indicates APM 1.0 is 739 * probably present. 740 * 741 * On entry val should point to a value indicating the APM driver 742 * version with the high byte being the major and the low byte the 743 * minor number both in BCD 744 * 745 * On return it will hold the BIOS revision supported in the 746 * same format. 747 */ 748 749 static int apm_driver_version(u_short *val) 750 { 751 u32 eax; 752 int err; 753 754 if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err)) 755 return err; 756 *val = eax; 757 return APM_SUCCESS; 758 } 759 760 /** 761 * apm_get_event - get an APM event from the BIOS 762 * @event: pointer to the event 763 * @info: point to the event information 764 * 765 * The APM BIOS provides a polled information for event 766 * reporting. The BIOS expects to be polled at least every second 767 * when events are pending. When a message is found the caller should 768 * poll until no more messages are present. However, this causes 769 * problems on some laptops where a suspend event notification is 770 * not cleared until it is acknowledged. 771 * 772 * Additional information is returned in the info pointer, providing 773 * that APM 1.2 is in use. If no messges are pending the value 0x80 774 * is returned (No power management events pending). 775 */ 776 static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) 777 { 778 struct apm_bios_call call; 779 780 call.func = APM_FUNC_GET_EVENT; 781 call.ebx = call.ecx = 0; 782 783 if (apm_bios_call(&call)) 784 return call.err; 785 786 *event = call.ebx; 787 if (apm_info.connection_version < 0x0102) 788 *info = ~0; /* indicate info not valid */ 789 else 790 *info = call.ecx; 791 return APM_SUCCESS; 792 } 793 794 /** 795 * set_power_state - set the power management state 796 * @what: which items to transition 797 * @state: state to transition to 798 * 799 * Request an APM change of state for one or more system devices. The 800 * processor state must be transitioned last of all. what holds the 801 * class of device in the upper byte and the device number (0xFF for 802 * all) for the object to be transitioned. 803 * 804 * The state holds the state to transition to, which may in fact 805 * be an acceptance of a BIOS requested state change. 806 */ 807 808 static int set_power_state(u_short what, u_short state) 809 { 810 u32 eax; 811 int err; 812 813 if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err)) 814 return err; 815 return APM_SUCCESS; 816 } 817 818 /** 819 * set_system_power_state - set system wide power state 820 * @state: which state to enter 821 * 822 * Transition the entire system into a new APM power state. 823 */ 824 825 static int set_system_power_state(u_short state) 826 { 827 return set_power_state(APM_DEVICE_ALL, state); 828 } 829 830 /** 831 * apm_do_idle - perform power saving 832 * 833 * This function notifies the BIOS that the processor is (in the view 834 * of the OS) idle. It returns -1 in the event that the BIOS refuses 835 * to handle the idle request. On a success the function returns 1 836 * if the BIOS did clock slowing or 0 otherwise. 837 */ 838 839 static int apm_do_idle(void) 840 { 841 u32 eax; 842 u8 ret = 0; 843 int idled = 0; 844 int err = 0; 845 846 if (!need_resched()) { 847 idled = 1; 848 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); 849 } 850 851 if (!idled) 852 return 0; 853 854 if (ret) { 855 static unsigned long t; 856 857 /* This always fails on some SMP boards running UP kernels. 858 * Only report the failure the first 5 times. 859 */ 860 if (++t < 5) { 861 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); 862 t = jiffies; 863 } 864 return -1; 865 } 866 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; 867 return clock_slowed; 868 } 869 870 /** 871 * apm_do_busy - inform the BIOS the CPU is busy 872 * 873 * Request that the BIOS brings the CPU back to full performance. 874 */ 875 876 static void apm_do_busy(void) 877 { 878 u32 dummy; 879 int err; 880 881 if (clock_slowed || ALWAYS_CALL_BUSY) { 882 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); 883 clock_slowed = 0; 884 } 885 } 886 887 /* 888 * If no process has really been interested in 889 * the CPU for some time, we want to call BIOS 890 * power management - we probably want 891 * to conserve power. 892 */ 893 #define IDLE_CALC_LIMIT (HZ * 100) 894 #define IDLE_LEAKY_MAX 16 895 896 /** 897 * apm_cpu_idle - cpu idling for APM capable Linux 898 * 899 * This is the idling function the kernel executes when APM is available. It 900 * tries to do BIOS powermanagement based on the average system idle time. 901 * Furthermore it calls the system default idle routine. 902 */ 903 904 static int apm_cpu_idle(struct cpuidle_device *dev, 905 struct cpuidle_driver *drv, int index) 906 { 907 static int use_apm_idle; /* = 0 */ 908 static unsigned int last_jiffies; /* = 0 */ 909 static u64 last_stime; /* = 0 */ 910 u64 stime, utime; 911 912 int apm_idle_done = 0; 913 unsigned int jiffies_since_last_check = jiffies - last_jiffies; 914 unsigned int bucket; 915 916 recalc: 917 task_cputime(current, &utime, &stime); 918 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 919 use_apm_idle = 0; 920 } else if (jiffies_since_last_check > idle_period) { 921 unsigned int idle_percentage; 922 923 idle_percentage = nsecs_to_jiffies(stime - last_stime); 924 idle_percentage *= 100; 925 idle_percentage /= jiffies_since_last_check; 926 use_apm_idle = (idle_percentage > idle_threshold); 927 if (apm_info.forbid_idle) 928 use_apm_idle = 0; 929 } 930 931 last_jiffies = jiffies; 932 last_stime = stime; 933 934 bucket = IDLE_LEAKY_MAX; 935 936 while (!need_resched()) { 937 if (use_apm_idle) { 938 unsigned int t; 939 940 t = jiffies; 941 switch (apm_do_idle()) { 942 case 0: 943 apm_idle_done = 1; 944 if (t != jiffies) { 945 if (bucket) { 946 bucket = IDLE_LEAKY_MAX; 947 continue; 948 } 949 } else if (bucket) { 950 bucket--; 951 continue; 952 } 953 break; 954 case 1: 955 apm_idle_done = 1; 956 break; 957 default: /* BIOS refused */ 958 break; 959 } 960 } 961 default_idle(); 962 local_irq_disable(); 963 jiffies_since_last_check = jiffies - last_jiffies; 964 if (jiffies_since_last_check > idle_period) 965 goto recalc; 966 } 967 968 if (apm_idle_done) 969 apm_do_busy(); 970 971 return index; 972 } 973 974 /** 975 * apm_power_off - ask the BIOS to power off 976 * 977 * Handle the power off sequence. This is the one piece of code we 978 * will execute even on SMP machines. In order to deal with BIOS 979 * bugs we support real mode APM BIOS power off calls. We also make 980 * the SMP call on CPU0 as some systems will only honour this call 981 * on their first cpu. 982 */ 983 984 static void apm_power_off(void) 985 { 986 /* Some bioses don't like being called from CPU != 0 */ 987 if (apm_info.realmode_power_off) { 988 set_cpus_allowed_ptr(current, cpumask_of(0)); 989 machine_real_restart(MRR_APM); 990 } else { 991 (void)set_system_power_state(APM_STATE_OFF); 992 } 993 } 994 995 #ifdef CONFIG_APM_DO_ENABLE 996 997 /** 998 * apm_enable_power_management - enable BIOS APM power management 999 * @enable: enable yes/no 1000 * 1001 * Enable or disable the APM BIOS power services. 1002 */ 1003 1004 static int apm_enable_power_management(int enable) 1005 { 1006 u32 eax; 1007 int err; 1008 1009 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 1010 return APM_NOT_ENGAGED; 1011 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 1012 enable, &eax, &err)) 1013 return err; 1014 if (enable) 1015 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 1016 else 1017 apm_info.bios.flags |= APM_BIOS_DISABLED; 1018 return APM_SUCCESS; 1019 } 1020 #endif 1021 1022 /** 1023 * apm_get_power_status - get current power state 1024 * @status: returned status 1025 * @bat: battery info 1026 * @life: estimated life 1027 * 1028 * Obtain the current power status from the APM BIOS. We return a 1029 * status which gives the rough battery status, and current power 1030 * source. The bat value returned give an estimate as a percentage 1031 * of life and a status value for the battery. The estimated life 1032 * if reported is a lifetime in secodnds/minutes at current powwer 1033 * consumption. 1034 */ 1035 1036 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 1037 { 1038 struct apm_bios_call call; 1039 1040 call.func = APM_FUNC_GET_STATUS; 1041 call.ebx = APM_DEVICE_ALL; 1042 call.ecx = 0; 1043 1044 if (apm_info.get_power_status_broken) 1045 return APM_32_UNSUPPORTED; 1046 if (apm_bios_call(&call)) { 1047 if (!call.err) 1048 return APM_NO_ERROR; 1049 return call.err; 1050 } 1051 *status = call.ebx; 1052 *bat = call.ecx; 1053 if (apm_info.get_power_status_swabinminutes) { 1054 *life = swab16((u16)call.edx); 1055 *life |= 0x8000; 1056 } else 1057 *life = call.edx; 1058 return APM_SUCCESS; 1059 } 1060 1061 #if 0 1062 static int apm_get_battery_status(u_short which, u_short *status, 1063 u_short *bat, u_short *life, u_short *nbat) 1064 { 1065 u32 eax; 1066 u32 ebx; 1067 u32 ecx; 1068 u32 edx; 1069 u32 esi; 1070 1071 if (apm_info.connection_version < 0x0102) { 1072 /* pretend we only have one battery. */ 1073 if (which != 1) 1074 return APM_BAD_DEVICE; 1075 *nbat = 1; 1076 return apm_get_power_status(status, bat, life); 1077 } 1078 1079 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1080 &ebx, &ecx, &edx, &esi)) 1081 return (eax >> 8) & 0xff; 1082 *status = ebx; 1083 *bat = ecx; 1084 *life = edx; 1085 *nbat = esi; 1086 return APM_SUCCESS; 1087 } 1088 #endif 1089 1090 /** 1091 * apm_engage_power_management - enable PM on a device 1092 * @device: identity of device 1093 * @enable: on/off 1094 * 1095 * Activate or deactivate power management on either a specific device 1096 * or the entire system (%APM_DEVICE_ALL). 1097 */ 1098 1099 static int apm_engage_power_management(u_short device, int enable) 1100 { 1101 u32 eax; 1102 int err; 1103 1104 if ((enable == 0) && (device == APM_DEVICE_ALL) 1105 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1106 return APM_DISABLED; 1107 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, 1108 &eax, &err)) 1109 return err; 1110 if (device == APM_DEVICE_ALL) { 1111 if (enable) 1112 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1113 else 1114 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1115 } 1116 return APM_SUCCESS; 1117 } 1118 1119 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1120 1121 /** 1122 * apm_console_blank - blank the display 1123 * @blank: on/off 1124 * 1125 * Attempt to blank the console, firstly by blanking just video device 1126 * zero, and if that fails (some BIOSes don't support it) then it blanks 1127 * all video devices. Typically the BIOS will do laptop backlight and 1128 * monitor powerdown for us. 1129 */ 1130 1131 static int apm_console_blank(int blank) 1132 { 1133 int error = APM_NOT_ENGAGED; /* silence gcc */ 1134 int i; 1135 u_short state; 1136 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1137 1138 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1139 1140 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1141 error = set_power_state(dev[i], state); 1142 1143 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1144 return 1; 1145 1146 if (error == APM_NOT_ENGAGED) 1147 break; 1148 } 1149 1150 if (error == APM_NOT_ENGAGED) { 1151 static int tried; 1152 int eng_error; 1153 if (tried++ == 0) { 1154 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1155 if (eng_error) { 1156 apm_error("set display", error); 1157 apm_error("engage interface", eng_error); 1158 return 0; 1159 } else 1160 return apm_console_blank(blank); 1161 } 1162 } 1163 apm_error("set display", error); 1164 return 0; 1165 } 1166 #endif 1167 1168 static int queue_empty(struct apm_user *as) 1169 { 1170 return as->event_head == as->event_tail; 1171 } 1172 1173 static apm_event_t get_queued_event(struct apm_user *as) 1174 { 1175 if (++as->event_tail >= APM_MAX_EVENTS) 1176 as->event_tail = 0; 1177 return as->events[as->event_tail]; 1178 } 1179 1180 static void queue_event(apm_event_t event, struct apm_user *sender) 1181 { 1182 struct apm_user *as; 1183 1184 spin_lock(&user_list_lock); 1185 if (user_list == NULL) 1186 goto out; 1187 for (as = user_list; as != NULL; as = as->next) { 1188 if ((as == sender) || (!as->reader)) 1189 continue; 1190 if (++as->event_head >= APM_MAX_EVENTS) 1191 as->event_head = 0; 1192 1193 if (as->event_head == as->event_tail) { 1194 static int notified; 1195 1196 if (notified++ == 0) 1197 pr_err("an event queue overflowed\n"); 1198 if (++as->event_tail >= APM_MAX_EVENTS) 1199 as->event_tail = 0; 1200 } 1201 as->events[as->event_head] = event; 1202 if (!as->suser || !as->writer) 1203 continue; 1204 switch (event) { 1205 case APM_SYS_SUSPEND: 1206 case APM_USER_SUSPEND: 1207 as->suspends_pending++; 1208 suspends_pending++; 1209 break; 1210 1211 case APM_SYS_STANDBY: 1212 case APM_USER_STANDBY: 1213 as->standbys_pending++; 1214 standbys_pending++; 1215 break; 1216 } 1217 } 1218 wake_up_interruptible(&apm_waitqueue); 1219 out: 1220 spin_unlock(&user_list_lock); 1221 } 1222 1223 static void reinit_timer(void) 1224 { 1225 #ifdef INIT_TIMER_AFTER_SUSPEND 1226 unsigned long flags; 1227 1228 raw_spin_lock_irqsave(&i8253_lock, flags); 1229 /* set the clock to HZ */ 1230 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1231 udelay(10); 1232 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ 1233 udelay(10); 1234 outb_p(LATCH >> 8, PIT_CH0); /* MSB */ 1235 udelay(10); 1236 raw_spin_unlock_irqrestore(&i8253_lock, flags); 1237 #endif 1238 } 1239 1240 static int suspend(int vetoable) 1241 { 1242 int err; 1243 struct apm_user *as; 1244 1245 dpm_suspend_start(PMSG_SUSPEND); 1246 dpm_suspend_end(PMSG_SUSPEND); 1247 1248 local_irq_disable(); 1249 syscore_suspend(); 1250 1251 local_irq_enable(); 1252 1253 save_processor_state(); 1254 err = set_system_power_state(APM_STATE_SUSPEND); 1255 ignore_normal_resume = 1; 1256 restore_processor_state(); 1257 1258 local_irq_disable(); 1259 reinit_timer(); 1260 1261 if (err == APM_NO_ERROR) 1262 err = APM_SUCCESS; 1263 if (err != APM_SUCCESS) 1264 apm_error("suspend", err); 1265 err = (err == APM_SUCCESS) ? 0 : -EIO; 1266 1267 syscore_resume(); 1268 local_irq_enable(); 1269 1270 dpm_resume_start(PMSG_RESUME); 1271 dpm_resume_end(PMSG_RESUME); 1272 1273 queue_event(APM_NORMAL_RESUME, NULL); 1274 spin_lock(&user_list_lock); 1275 for (as = user_list; as != NULL; as = as->next) { 1276 as->suspend_wait = 0; 1277 as->suspend_result = err; 1278 } 1279 spin_unlock(&user_list_lock); 1280 wake_up_interruptible(&apm_suspend_waitqueue); 1281 return err; 1282 } 1283 1284 static void standby(void) 1285 { 1286 int err; 1287 1288 dpm_suspend_end(PMSG_SUSPEND); 1289 1290 local_irq_disable(); 1291 syscore_suspend(); 1292 local_irq_enable(); 1293 1294 err = set_system_power_state(APM_STATE_STANDBY); 1295 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1296 apm_error("standby", err); 1297 1298 local_irq_disable(); 1299 syscore_resume(); 1300 local_irq_enable(); 1301 1302 dpm_resume_start(PMSG_RESUME); 1303 } 1304 1305 static apm_event_t get_event(void) 1306 { 1307 int error; 1308 apm_event_t event = APM_NO_EVENTS; /* silence gcc */ 1309 apm_eventinfo_t info; 1310 1311 static int notified; 1312 1313 /* we don't use the eventinfo */ 1314 error = apm_get_event(&event, &info); 1315 if (error == APM_SUCCESS) 1316 return event; 1317 1318 if ((error != APM_NO_EVENTS) && (notified++ == 0)) 1319 apm_error("get_event", error); 1320 1321 return 0; 1322 } 1323 1324 static void check_events(void) 1325 { 1326 apm_event_t event; 1327 static unsigned long last_resume; 1328 static int ignore_bounce; 1329 1330 while ((event = get_event()) != 0) { 1331 if (debug) { 1332 if (event <= NR_APM_EVENT_NAME) 1333 printk(KERN_DEBUG "apm: received %s notify\n", 1334 apm_event_name[event - 1]); 1335 else 1336 printk(KERN_DEBUG "apm: received unknown " 1337 "event 0x%02x\n", event); 1338 } 1339 if (ignore_bounce 1340 && (time_after(jiffies, last_resume + bounce_interval))) 1341 ignore_bounce = 0; 1342 1343 switch (event) { 1344 case APM_SYS_STANDBY: 1345 case APM_USER_STANDBY: 1346 queue_event(event, NULL); 1347 if (standbys_pending <= 0) 1348 standby(); 1349 break; 1350 1351 case APM_USER_SUSPEND: 1352 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND 1353 if (apm_info.connection_version > 0x100) 1354 set_system_power_state(APM_STATE_REJECT); 1355 break; 1356 #endif 1357 case APM_SYS_SUSPEND: 1358 if (ignore_bounce) { 1359 if (apm_info.connection_version > 0x100) 1360 set_system_power_state(APM_STATE_REJECT); 1361 break; 1362 } 1363 /* 1364 * If we are already processing a SUSPEND, 1365 * then further SUSPEND events from the BIOS 1366 * will be ignored. We also return here to 1367 * cope with the fact that the Thinkpads keep 1368 * sending a SUSPEND event until something else 1369 * happens! 1370 */ 1371 if (ignore_sys_suspend) 1372 return; 1373 ignore_sys_suspend = 1; 1374 queue_event(event, NULL); 1375 if (suspends_pending <= 0) 1376 (void) suspend(1); 1377 break; 1378 1379 case APM_NORMAL_RESUME: 1380 case APM_CRITICAL_RESUME: 1381 case APM_STANDBY_RESUME: 1382 ignore_sys_suspend = 0; 1383 last_resume = jiffies; 1384 ignore_bounce = 1; 1385 if ((event != APM_NORMAL_RESUME) 1386 || (ignore_normal_resume == 0)) { 1387 dpm_resume_end(PMSG_RESUME); 1388 queue_event(event, NULL); 1389 } 1390 ignore_normal_resume = 0; 1391 break; 1392 1393 case APM_CAPABILITY_CHANGE: 1394 case APM_LOW_BATTERY: 1395 case APM_POWER_STATUS_CHANGE: 1396 queue_event(event, NULL); 1397 /* If needed, notify drivers here */ 1398 break; 1399 1400 case APM_UPDATE_TIME: 1401 break; 1402 1403 case APM_CRITICAL_SUSPEND: 1404 /* 1405 * We are not allowed to reject a critical suspend. 1406 */ 1407 (void)suspend(0); 1408 break; 1409 } 1410 } 1411 } 1412 1413 static void apm_event_handler(void) 1414 { 1415 static int pending_count = 4; 1416 int err; 1417 1418 if ((standbys_pending > 0) || (suspends_pending > 0)) { 1419 if ((apm_info.connection_version > 0x100) && 1420 (pending_count-- <= 0)) { 1421 pending_count = 4; 1422 if (debug) 1423 printk(KERN_DEBUG "apm: setting state busy\n"); 1424 err = set_system_power_state(APM_STATE_BUSY); 1425 if (err) 1426 apm_error("busy", err); 1427 } 1428 } else 1429 pending_count = 4; 1430 check_events(); 1431 } 1432 1433 /* 1434 * This is the APM thread main loop. 1435 */ 1436 1437 static void apm_mainloop(void) 1438 { 1439 DECLARE_WAITQUEUE(wait, current); 1440 1441 add_wait_queue(&apm_waitqueue, &wait); 1442 set_current_state(TASK_INTERRUPTIBLE); 1443 for (;;) { 1444 schedule_timeout(APM_CHECK_TIMEOUT); 1445 if (kthread_should_stop()) 1446 break; 1447 /* 1448 * Ok, check all events, check for idle (and mark us sleeping 1449 * so as not to count towards the load average).. 1450 */ 1451 set_current_state(TASK_INTERRUPTIBLE); 1452 apm_event_handler(); 1453 } 1454 remove_wait_queue(&apm_waitqueue, &wait); 1455 } 1456 1457 static int check_apm_user(struct apm_user *as, const char *func) 1458 { 1459 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1460 pr_err("%s passed bad filp\n", func); 1461 return 1; 1462 } 1463 return 0; 1464 } 1465 1466 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) 1467 { 1468 struct apm_user *as; 1469 int i; 1470 apm_event_t event; 1471 1472 as = fp->private_data; 1473 if (check_apm_user(as, "read")) 1474 return -EIO; 1475 if ((int)count < sizeof(apm_event_t)) 1476 return -EINVAL; 1477 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) 1478 return -EAGAIN; 1479 wait_event_interruptible(apm_waitqueue, !queue_empty(as)); 1480 i = count; 1481 while ((i >= sizeof(event)) && !queue_empty(as)) { 1482 event = get_queued_event(as); 1483 if (copy_to_user(buf, &event, sizeof(event))) { 1484 if (i < count) 1485 break; 1486 return -EFAULT; 1487 } 1488 switch (event) { 1489 case APM_SYS_SUSPEND: 1490 case APM_USER_SUSPEND: 1491 as->suspends_read++; 1492 break; 1493 1494 case APM_SYS_STANDBY: 1495 case APM_USER_STANDBY: 1496 as->standbys_read++; 1497 break; 1498 } 1499 buf += sizeof(event); 1500 i -= sizeof(event); 1501 } 1502 if (i < count) 1503 return count - i; 1504 if (signal_pending(current)) 1505 return -ERESTARTSYS; 1506 return 0; 1507 } 1508 1509 static __poll_t do_poll(struct file *fp, poll_table *wait) 1510 { 1511 struct apm_user *as; 1512 1513 as = fp->private_data; 1514 if (check_apm_user(as, "poll")) 1515 return 0; 1516 poll_wait(fp, &apm_waitqueue, wait); 1517 if (!queue_empty(as)) 1518 return EPOLLIN | EPOLLRDNORM; 1519 return 0; 1520 } 1521 1522 static long do_ioctl(struct file *filp, u_int cmd, u_long arg) 1523 { 1524 struct apm_user *as; 1525 int ret; 1526 1527 as = filp->private_data; 1528 if (check_apm_user(as, "ioctl")) 1529 return -EIO; 1530 if (!as->suser || !as->writer) 1531 return -EPERM; 1532 switch (cmd) { 1533 case APM_IOC_STANDBY: 1534 mutex_lock(&apm_mutex); 1535 if (as->standbys_read > 0) { 1536 as->standbys_read--; 1537 as->standbys_pending--; 1538 standbys_pending--; 1539 } else 1540 queue_event(APM_USER_STANDBY, as); 1541 if (standbys_pending <= 0) 1542 standby(); 1543 mutex_unlock(&apm_mutex); 1544 break; 1545 case APM_IOC_SUSPEND: 1546 mutex_lock(&apm_mutex); 1547 if (as->suspends_read > 0) { 1548 as->suspends_read--; 1549 as->suspends_pending--; 1550 suspends_pending--; 1551 } else 1552 queue_event(APM_USER_SUSPEND, as); 1553 if (suspends_pending <= 0) { 1554 ret = suspend(1); 1555 mutex_unlock(&apm_mutex); 1556 } else { 1557 as->suspend_wait = 1; 1558 mutex_unlock(&apm_mutex); 1559 wait_event_interruptible(apm_suspend_waitqueue, 1560 as->suspend_wait == 0); 1561 ret = as->suspend_result; 1562 } 1563 return ret; 1564 default: 1565 return -ENOTTY; 1566 } 1567 return 0; 1568 } 1569 1570 static int do_release(struct inode *inode, struct file *filp) 1571 { 1572 struct apm_user *as; 1573 1574 as = filp->private_data; 1575 if (check_apm_user(as, "release")) 1576 return 0; 1577 filp->private_data = NULL; 1578 if (as->standbys_pending > 0) { 1579 standbys_pending -= as->standbys_pending; 1580 if (standbys_pending <= 0) 1581 standby(); 1582 } 1583 if (as->suspends_pending > 0) { 1584 suspends_pending -= as->suspends_pending; 1585 if (suspends_pending <= 0) 1586 (void) suspend(1); 1587 } 1588 spin_lock(&user_list_lock); 1589 if (user_list == as) 1590 user_list = as->next; 1591 else { 1592 struct apm_user *as1; 1593 1594 for (as1 = user_list; 1595 (as1 != NULL) && (as1->next != as); 1596 as1 = as1->next) 1597 ; 1598 if (as1 == NULL) 1599 pr_err("filp not in user list\n"); 1600 else 1601 as1->next = as->next; 1602 } 1603 spin_unlock(&user_list_lock); 1604 kfree(as); 1605 return 0; 1606 } 1607 1608 static int do_open(struct inode *inode, struct file *filp) 1609 { 1610 struct apm_user *as; 1611 1612 as = kmalloc(sizeof(*as), GFP_KERNEL); 1613 if (as == NULL) 1614 return -ENOMEM; 1615 1616 as->magic = APM_BIOS_MAGIC; 1617 as->event_tail = as->event_head = 0; 1618 as->suspends_pending = as->standbys_pending = 0; 1619 as->suspends_read = as->standbys_read = 0; 1620 /* 1621 * XXX - this is a tiny bit broken, when we consider BSD 1622 * process accounting. If the device is opened by root, we 1623 * instantly flag that we used superuser privs. Who knows, 1624 * we might close the device immediately without doing a 1625 * privileged operation -- cevans 1626 */ 1627 as->suser = capable(CAP_SYS_ADMIN); 1628 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1629 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1630 spin_lock(&user_list_lock); 1631 as->next = user_list; 1632 user_list = as; 1633 spin_unlock(&user_list_lock); 1634 filp->private_data = as; 1635 return 0; 1636 } 1637 1638 static int proc_apm_show(struct seq_file *m, void *v) 1639 { 1640 unsigned short bx; 1641 unsigned short cx; 1642 unsigned short dx; 1643 int error; 1644 unsigned short ac_line_status = 0xff; 1645 unsigned short battery_status = 0xff; 1646 unsigned short battery_flag = 0xff; 1647 int percentage = -1; 1648 int time_units = -1; 1649 char *units = "?"; 1650 1651 if ((num_online_cpus() == 1) && 1652 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1653 ac_line_status = (bx >> 8) & 0xff; 1654 battery_status = bx & 0xff; 1655 if ((cx & 0xff) != 0xff) 1656 percentage = cx & 0xff; 1657 1658 if (apm_info.connection_version > 0x100) { 1659 battery_flag = (cx >> 8) & 0xff; 1660 if (dx != 0xffff) { 1661 units = (dx & 0x8000) ? "min" : "sec"; 1662 time_units = dx & 0x7fff; 1663 } 1664 } 1665 } 1666 /* Arguments, with symbols from linux/apm_bios.h. Information is 1667 from the Get Power Status (0x0a) call unless otherwise noted. 1668 1669 0) Linux driver version (this will change if format changes) 1670 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1671 2) APM flags from APM Installation Check (0x00): 1672 bit 0: APM_16_BIT_SUPPORT 1673 bit 1: APM_32_BIT_SUPPORT 1674 bit 2: APM_IDLE_SLOWS_CLOCK 1675 bit 3: APM_BIOS_DISABLED 1676 bit 4: APM_BIOS_DISENGAGED 1677 3) AC line status 1678 0x00: Off-line 1679 0x01: On-line 1680 0x02: On backup power (BIOS >= 1.1 only) 1681 0xff: Unknown 1682 4) Battery status 1683 0x00: High 1684 0x01: Low 1685 0x02: Critical 1686 0x03: Charging 1687 0x04: Selected battery not present (BIOS >= 1.2 only) 1688 0xff: Unknown 1689 5) Battery flag 1690 bit 0: High 1691 bit 1: Low 1692 bit 2: Critical 1693 bit 3: Charging 1694 bit 7: No system battery 1695 0xff: Unknown 1696 6) Remaining battery life (percentage of charge): 1697 0-100: valid 1698 -1: Unknown 1699 7) Remaining battery life (time units): 1700 Number of remaining minutes or seconds 1701 -1: Unknown 1702 8) min = minutes; sec = seconds */ 1703 1704 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1705 driver_version, 1706 (apm_info.bios.version >> 8) & 0xff, 1707 apm_info.bios.version & 0xff, 1708 apm_info.bios.flags, 1709 ac_line_status, 1710 battery_status, 1711 battery_flag, 1712 percentage, 1713 time_units, 1714 units); 1715 return 0; 1716 } 1717 1718 static int proc_apm_open(struct inode *inode, struct file *file) 1719 { 1720 return single_open(file, proc_apm_show, NULL); 1721 } 1722 1723 static const struct file_operations apm_file_ops = { 1724 .owner = THIS_MODULE, 1725 .open = proc_apm_open, 1726 .read = seq_read, 1727 .llseek = seq_lseek, 1728 .release = single_release, 1729 }; 1730 1731 static int apm(void *unused) 1732 { 1733 unsigned short bx; 1734 unsigned short cx; 1735 unsigned short dx; 1736 int error; 1737 char *power_stat; 1738 char *bat_stat; 1739 1740 /* 2002/08/01 - WT 1741 * This is to avoid random crashes at boot time during initialization 1742 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1743 * Some bioses don't like being called from CPU != 0. 1744 * Method suggested by Ingo Molnar. 1745 */ 1746 set_cpus_allowed_ptr(current, cpumask_of(0)); 1747 BUG_ON(smp_processor_id() != 0); 1748 1749 if (apm_info.connection_version == 0) { 1750 apm_info.connection_version = apm_info.bios.version; 1751 if (apm_info.connection_version > 0x100) { 1752 /* 1753 * We only support BIOSs up to version 1.2 1754 */ 1755 if (apm_info.connection_version > 0x0102) 1756 apm_info.connection_version = 0x0102; 1757 error = apm_driver_version(&apm_info.connection_version); 1758 if (error != APM_SUCCESS) { 1759 apm_error("driver version", error); 1760 /* Fall back to an APM 1.0 connection. */ 1761 apm_info.connection_version = 0x100; 1762 } 1763 } 1764 } 1765 1766 if (debug) 1767 printk(KERN_INFO "apm: Connection version %d.%d\n", 1768 (apm_info.connection_version >> 8) & 0xff, 1769 apm_info.connection_version & 0xff); 1770 1771 #ifdef CONFIG_APM_DO_ENABLE 1772 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1773 /* 1774 * This call causes my NEC UltraLite Versa 33/C to hang if it 1775 * is booted with PM disabled but not in the docking station. 1776 * Unfortunate ... 1777 */ 1778 error = apm_enable_power_management(1); 1779 if (error) { 1780 apm_error("enable power management", error); 1781 return -1; 1782 } 1783 } 1784 #endif 1785 1786 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1787 && (apm_info.connection_version > 0x0100)) { 1788 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1789 if (error) { 1790 apm_error("engage power management", error); 1791 return -1; 1792 } 1793 } 1794 1795 if (debug && (num_online_cpus() == 1 || smp)) { 1796 error = apm_get_power_status(&bx, &cx, &dx); 1797 if (error) 1798 printk(KERN_INFO "apm: power status not available\n"); 1799 else { 1800 switch ((bx >> 8) & 0xff) { 1801 case 0: 1802 power_stat = "off line"; 1803 break; 1804 case 1: 1805 power_stat = "on line"; 1806 break; 1807 case 2: 1808 power_stat = "on backup power"; 1809 break; 1810 default: 1811 power_stat = "unknown"; 1812 break; 1813 } 1814 switch (bx & 0xff) { 1815 case 0: 1816 bat_stat = "high"; 1817 break; 1818 case 1: 1819 bat_stat = "low"; 1820 break; 1821 case 2: 1822 bat_stat = "critical"; 1823 break; 1824 case 3: 1825 bat_stat = "charging"; 1826 break; 1827 default: 1828 bat_stat = "unknown"; 1829 break; 1830 } 1831 printk(KERN_INFO 1832 "apm: AC %s, battery status %s, battery life ", 1833 power_stat, bat_stat); 1834 if ((cx & 0xff) == 0xff) 1835 printk("unknown\n"); 1836 else 1837 printk("%d%%\n", cx & 0xff); 1838 if (apm_info.connection_version > 0x100) { 1839 printk(KERN_INFO 1840 "apm: battery flag 0x%02x, battery life ", 1841 (cx >> 8) & 0xff); 1842 if (dx == 0xffff) 1843 printk("unknown\n"); 1844 else 1845 printk("%d %s\n", dx & 0x7fff, 1846 (dx & 0x8000) ? 1847 "minutes" : "seconds"); 1848 } 1849 } 1850 } 1851 1852 /* Install our power off handler.. */ 1853 if (power_off) 1854 pm_power_off = apm_power_off; 1855 1856 if (num_online_cpus() == 1 || smp) { 1857 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1858 console_blank_hook = apm_console_blank; 1859 #endif 1860 apm_mainloop(); 1861 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1862 console_blank_hook = NULL; 1863 #endif 1864 } 1865 1866 return 0; 1867 } 1868 1869 #ifndef MODULE 1870 static int __init apm_setup(char *str) 1871 { 1872 int invert; 1873 1874 while ((str != NULL) && (*str != '\0')) { 1875 if (strncmp(str, "off", 3) == 0) 1876 apm_disabled = 1; 1877 if (strncmp(str, "on", 2) == 0) 1878 apm_disabled = 0; 1879 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1880 (strncmp(str, "bounce_interval=", 16) == 0)) 1881 bounce_interval = simple_strtol(str + 16, NULL, 0); 1882 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1883 (strncmp(str, "idle_threshold=", 15) == 0)) 1884 idle_threshold = simple_strtol(str + 15, NULL, 0); 1885 if ((strncmp(str, "idle-period=", 12) == 0) || 1886 (strncmp(str, "idle_period=", 12) == 0)) 1887 idle_period = simple_strtol(str + 12, NULL, 0); 1888 invert = (strncmp(str, "no-", 3) == 0) || 1889 (strncmp(str, "no_", 3) == 0); 1890 if (invert) 1891 str += 3; 1892 if (strncmp(str, "debug", 5) == 0) 1893 debug = !invert; 1894 if ((strncmp(str, "power-off", 9) == 0) || 1895 (strncmp(str, "power_off", 9) == 0)) 1896 power_off = !invert; 1897 if (strncmp(str, "smp", 3) == 0) { 1898 smp = !invert; 1899 idle_threshold = 100; 1900 } 1901 if ((strncmp(str, "allow-ints", 10) == 0) || 1902 (strncmp(str, "allow_ints", 10) == 0)) 1903 apm_info.allow_ints = !invert; 1904 if ((strncmp(str, "broken-psr", 10) == 0) || 1905 (strncmp(str, "broken_psr", 10) == 0)) 1906 apm_info.get_power_status_broken = !invert; 1907 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1908 (strncmp(str, "realmode_power_off", 18) == 0)) 1909 apm_info.realmode_power_off = !invert; 1910 str = strchr(str, ','); 1911 if (str != NULL) 1912 str += strspn(str, ", \t"); 1913 } 1914 return 1; 1915 } 1916 1917 __setup("apm=", apm_setup); 1918 #endif 1919 1920 static const struct file_operations apm_bios_fops = { 1921 .owner = THIS_MODULE, 1922 .read = do_read, 1923 .poll = do_poll, 1924 .unlocked_ioctl = do_ioctl, 1925 .open = do_open, 1926 .release = do_release, 1927 .llseek = noop_llseek, 1928 }; 1929 1930 static struct miscdevice apm_device = { 1931 APM_MINOR_DEV, 1932 "apm_bios", 1933 &apm_bios_fops 1934 }; 1935 1936 1937 /* Simple "print if true" callback */ 1938 static int __init print_if_true(const struct dmi_system_id *d) 1939 { 1940 printk("%s\n", d->ident); 1941 return 0; 1942 } 1943 1944 /* 1945 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1946 * disabled before the suspend. Linux used to get terribly confused by that. 1947 */ 1948 static int __init broken_ps2_resume(const struct dmi_system_id *d) 1949 { 1950 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1951 "workaround hopefully not needed.\n", d->ident); 1952 return 0; 1953 } 1954 1955 /* Some bioses have a broken protected mode poweroff and need to use realmode */ 1956 static int __init set_realmode_power_off(const struct dmi_system_id *d) 1957 { 1958 if (apm_info.realmode_power_off == 0) { 1959 apm_info.realmode_power_off = 1; 1960 printk(KERN_INFO "%s bios detected. " 1961 "Using realmode poweroff only.\n", d->ident); 1962 } 1963 return 0; 1964 } 1965 1966 /* Some laptops require interrupts to be enabled during APM calls */ 1967 static int __init set_apm_ints(const struct dmi_system_id *d) 1968 { 1969 if (apm_info.allow_ints == 0) { 1970 apm_info.allow_ints = 1; 1971 printk(KERN_INFO "%s machine detected. " 1972 "Enabling interrupts during APM calls.\n", d->ident); 1973 } 1974 return 0; 1975 } 1976 1977 /* Some APM bioses corrupt memory or just plain do not work */ 1978 static int __init apm_is_horked(const struct dmi_system_id *d) 1979 { 1980 if (apm_info.disabled == 0) { 1981 apm_info.disabled = 1; 1982 printk(KERN_INFO "%s machine detected. " 1983 "Disabling APM.\n", d->ident); 1984 } 1985 return 0; 1986 } 1987 1988 static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1989 { 1990 if (apm_info.disabled == 0) { 1991 apm_info.disabled = 1; 1992 printk(KERN_INFO "%s machine detected. " 1993 "Disabling APM.\n", d->ident); 1994 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); 1995 printk(KERN_INFO "download from support.intel.com\n"); 1996 } 1997 return 0; 1998 } 1999 2000 /* Some APM bioses hang on APM idle calls */ 2001 static int __init apm_likes_to_melt(const struct dmi_system_id *d) 2002 { 2003 if (apm_info.forbid_idle == 0) { 2004 apm_info.forbid_idle = 1; 2005 printk(KERN_INFO "%s machine detected. " 2006 "Disabling APM idle calls.\n", d->ident); 2007 } 2008 return 0; 2009 } 2010 2011 /* 2012 * Check for clue free BIOS implementations who use 2013 * the following QA technique 2014 * 2015 * [ Write BIOS Code ]<------ 2016 * | ^ 2017 * < Does it Compile >----N-- 2018 * |Y ^ 2019 * < Does it Boot Win98 >-N-- 2020 * |Y 2021 * [Ship It] 2022 * 2023 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 2024 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 2025 */ 2026 static int __init broken_apm_power(const struct dmi_system_id *d) 2027 { 2028 apm_info.get_power_status_broken = 1; 2029 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 2030 "disabling power status reporting.\n"); 2031 return 0; 2032 } 2033 2034 /* 2035 * This bios swaps the APM minute reporting bytes over (Many sony laptops 2036 * have this problem). 2037 */ 2038 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 2039 { 2040 apm_info.get_power_status_swabinminutes = 1; 2041 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 2042 "in minutes and wrong byte order.\n"); 2043 return 0; 2044 } 2045 2046 static const struct dmi_system_id apm_dmi_table[] __initconst = { 2047 { 2048 print_if_true, 2049 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2050 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2051 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2052 }, 2053 { /* Handle problems with APM on the C600 */ 2054 broken_ps2_resume, "Dell Latitude C600", 2055 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2056 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2057 }, 2058 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2059 set_apm_ints, "Dell Latitude", 2060 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2061 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2062 }, 2063 { /* APM crashes */ 2064 apm_is_horked, "Dell Inspiron 2500", 2065 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2066 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2067 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2068 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2069 }, 2070 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2071 set_apm_ints, "Dell Inspiron", { 2072 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2073 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2074 }, 2075 { /* Handle problems with APM on Inspiron 5000e */ 2076 broken_apm_power, "Dell Inspiron 5000e", 2077 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2078 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2079 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2080 }, 2081 { /* Handle problems with APM on Inspiron 2500 */ 2082 broken_apm_power, "Dell Inspiron 2500", 2083 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2084 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2085 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2086 }, 2087 { /* APM crashes */ 2088 apm_is_horked, "Dell Dimension 4100", 2089 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2090 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2091 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2092 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2093 }, 2094 { /* Allow interrupts during suspend on Compaq Laptops*/ 2095 set_apm_ints, "Compaq 12XL125", 2096 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2097 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2098 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2099 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2100 }, 2101 { /* Allow interrupts during APM or the clock goes slow */ 2102 set_apm_ints, "ASUSTeK", 2103 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2104 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2105 }, 2106 { /* APM blows on shutdown */ 2107 apm_is_horked, "ABIT KX7-333[R]", 2108 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2109 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2110 }, 2111 { /* APM crashes */ 2112 apm_is_horked, "Trigem Delhi3", 2113 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2114 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2115 }, 2116 { /* APM crashes */ 2117 apm_is_horked, "Fujitsu-Siemens", 2118 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2119 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2120 }, 2121 { /* APM crashes */ 2122 apm_is_horked_d850md, "Intel D850MD", 2123 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2124 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2125 }, 2126 { /* APM crashes */ 2127 apm_is_horked, "Intel D810EMO", 2128 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2129 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2130 }, 2131 { /* APM crashes */ 2132 apm_is_horked, "Dell XPS-Z", 2133 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2134 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2135 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2136 }, 2137 { /* APM crashes */ 2138 apm_is_horked, "Sharp PC-PJ/AX", 2139 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2140 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2141 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2142 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2143 }, 2144 { /* APM crashes */ 2145 apm_is_horked, "Dell Inspiron 2500", 2146 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2147 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2148 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2149 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2150 }, 2151 { /* APM idle hangs */ 2152 apm_likes_to_melt, "Jabil AMD", 2153 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2154 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2155 }, 2156 { /* APM idle hangs */ 2157 apm_likes_to_melt, "AMI Bios", 2158 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2159 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2160 }, 2161 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2162 swab_apm_power_in_minutes, "Sony VAIO", 2163 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2164 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2165 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2166 }, 2167 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2168 swab_apm_power_in_minutes, "Sony VAIO", 2169 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2170 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2171 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2172 }, 2173 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2174 swab_apm_power_in_minutes, "Sony VAIO", 2175 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2176 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2177 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2178 }, 2179 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2180 swab_apm_power_in_minutes, "Sony VAIO", 2181 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2182 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2183 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2184 }, 2185 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2186 swab_apm_power_in_minutes, "Sony VAIO", 2187 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2188 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2189 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2190 }, 2191 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2192 swab_apm_power_in_minutes, "Sony VAIO", 2193 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2194 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2195 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2196 }, 2197 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2198 swab_apm_power_in_minutes, "Sony VAIO", 2199 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2200 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2201 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2202 }, 2203 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2204 swab_apm_power_in_minutes, "Sony VAIO", 2205 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2206 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2207 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2208 }, 2209 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2210 swab_apm_power_in_minutes, "Sony VAIO", 2211 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2212 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2213 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2214 }, 2215 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2216 swab_apm_power_in_minutes, "Sony VAIO", 2217 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2218 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2219 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2220 }, 2221 2222 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2223 swab_apm_power_in_minutes, "Sony VAIO", 2224 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2225 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2226 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2227 }, 2228 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2229 swab_apm_power_in_minutes, "Sony VAIO", 2230 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2231 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2232 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2233 }, 2234 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2235 swab_apm_power_in_minutes, "Sony VAIO", 2236 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2237 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2238 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2239 }, 2240 { /* broken PM poweroff bios */ 2241 set_realmode_power_off, "Award Software v4.60 PGMA", 2242 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2243 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2244 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2245 }, 2246 2247 /* Generic per vendor APM settings */ 2248 2249 { /* Allow interrupts during suspend on IBM laptops */ 2250 set_apm_ints, "IBM", 2251 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2252 }, 2253 2254 { } 2255 }; 2256 2257 /* 2258 * Just start the APM thread. We do NOT want to do APM BIOS 2259 * calls from anything but the APM thread, if for no other reason 2260 * than the fact that we don't trust the APM BIOS. This way, 2261 * most common APM BIOS problems that lead to protection errors 2262 * etc will have at least some level of being contained... 2263 * 2264 * In short, if something bad happens, at least we have a choice 2265 * of just killing the apm thread.. 2266 */ 2267 static int __init apm_init(void) 2268 { 2269 struct desc_struct *gdt; 2270 int err; 2271 2272 dmi_check_system(apm_dmi_table); 2273 2274 if (apm_info.bios.version == 0 || machine_is_olpc()) { 2275 printk(KERN_INFO "apm: BIOS not found.\n"); 2276 return -ENODEV; 2277 } 2278 printk(KERN_INFO 2279 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2280 ((apm_info.bios.version >> 8) & 0xff), 2281 (apm_info.bios.version & 0xff), 2282 apm_info.bios.flags, 2283 driver_version); 2284 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2285 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2286 return -ENODEV; 2287 } 2288 2289 if (allow_ints) 2290 apm_info.allow_ints = 1; 2291 if (broken_psr) 2292 apm_info.get_power_status_broken = 1; 2293 if (realmode_power_off) 2294 apm_info.realmode_power_off = 1; 2295 /* User can override, but default is to trust DMI */ 2296 if (apm_disabled != -1) 2297 apm_info.disabled = apm_disabled; 2298 2299 /* 2300 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2301 * but is reportedly a 1.0 BIOS. 2302 */ 2303 if (apm_info.bios.version == 0x001) 2304 apm_info.bios.version = 0x100; 2305 2306 /* BIOS < 1.2 doesn't set cseg_16_len */ 2307 if (apm_info.bios.version < 0x102) 2308 apm_info.bios.cseg_16_len = 0; /* 64k */ 2309 2310 if (debug) { 2311 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2312 apm_info.bios.cseg, apm_info.bios.offset, 2313 apm_info.bios.cseg_16, apm_info.bios.dseg); 2314 if (apm_info.bios.version > 0x100) 2315 printk(" cseg len %x, dseg len %x", 2316 apm_info.bios.cseg_len, 2317 apm_info.bios.dseg_len); 2318 if (apm_info.bios.version > 0x101) 2319 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2320 printk("\n"); 2321 } 2322 2323 if (apm_info.disabled) { 2324 pr_notice("disabled on user request.\n"); 2325 return -ENODEV; 2326 } 2327 if ((num_online_cpus() > 1) && !power_off && !smp) { 2328 pr_notice("disabled - APM is not SMP safe.\n"); 2329 apm_info.disabled = 1; 2330 return -ENODEV; 2331 } 2332 if (!acpi_disabled) { 2333 pr_notice("overridden by ACPI.\n"); 2334 apm_info.disabled = 1; 2335 return -ENODEV; 2336 } 2337 2338 /* 2339 * Set up the long jump entry point to the APM BIOS, which is called 2340 * from inline assembly. 2341 */ 2342 apm_bios_entry.offset = apm_info.bios.offset; 2343 apm_bios_entry.segment = APM_CS; 2344 2345 /* 2346 * The APM 1.1 BIOS is supposed to provide limit information that it 2347 * recognizes. Many machines do this correctly, but many others do 2348 * not restrict themselves to their claimed limit. When this happens, 2349 * they will cause a segmentation violation in the kernel at boot time. 2350 * Most BIOS's, however, will respect a 64k limit, so we use that. 2351 * 2352 * Note we only set APM segments on CPU zero, since we pin the APM 2353 * code to that CPU. 2354 */ 2355 gdt = get_cpu_gdt_rw(0); 2356 set_desc_base(&gdt[APM_CS >> 3], 2357 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); 2358 set_desc_base(&gdt[APM_CS_16 >> 3], 2359 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); 2360 set_desc_base(&gdt[APM_DS >> 3], 2361 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); 2362 2363 proc_create("apm", 0, NULL, &apm_file_ops); 2364 2365 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2366 if (IS_ERR(kapmd_task)) { 2367 pr_err("disabled - Unable to start kernel thread\n"); 2368 err = PTR_ERR(kapmd_task); 2369 kapmd_task = NULL; 2370 remove_proc_entry("apm", NULL); 2371 return err; 2372 } 2373 wake_up_process(kapmd_task); 2374 2375 if (num_online_cpus() > 1 && !smp) { 2376 printk(KERN_NOTICE 2377 "apm: disabled - APM is not SMP safe (power off active).\n"); 2378 return 0; 2379 } 2380 2381 /* 2382 * Note we don't actually care if the misc_device cannot be registered. 2383 * this driver can do its job without it, even if userspace can't 2384 * control it. just log the error 2385 */ 2386 if (misc_register(&apm_device)) 2387 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2388 2389 if (HZ != 100) 2390 idle_period = (idle_period * HZ) / 100; 2391 if (idle_threshold < 100) { 2392 cpuidle_poll_state_init(&apm_idle_driver); 2393 if (!cpuidle_register_driver(&apm_idle_driver)) 2394 if (cpuidle_register_device(&apm_cpuidle_device)) 2395 cpuidle_unregister_driver(&apm_idle_driver); 2396 } 2397 2398 return 0; 2399 } 2400 2401 static void __exit apm_exit(void) 2402 { 2403 int error; 2404 2405 cpuidle_unregister_device(&apm_cpuidle_device); 2406 cpuidle_unregister_driver(&apm_idle_driver); 2407 2408 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) 2409 && (apm_info.connection_version > 0x0100)) { 2410 error = apm_engage_power_management(APM_DEVICE_ALL, 0); 2411 if (error) 2412 apm_error("disengage power management", error); 2413 } 2414 misc_deregister(&apm_device); 2415 remove_proc_entry("apm", NULL); 2416 if (power_off) 2417 pm_power_off = NULL; 2418 if (kapmd_task) { 2419 kthread_stop(kapmd_task); 2420 kapmd_task = NULL; 2421 } 2422 } 2423 2424 module_init(apm_init); 2425 module_exit(apm_exit); 2426 2427 MODULE_AUTHOR("Stephen Rothwell"); 2428 MODULE_DESCRIPTION("Advanced Power Management"); 2429 MODULE_LICENSE("GPL"); 2430 module_param(debug, bool, 0644); 2431 MODULE_PARM_DESC(debug, "Enable debug mode"); 2432 module_param(power_off, bool, 0444); 2433 MODULE_PARM_DESC(power_off, "Enable power off"); 2434 module_param(bounce_interval, int, 0444); 2435 MODULE_PARM_DESC(bounce_interval, 2436 "Set the number of ticks to ignore suspend bounces"); 2437 module_param(allow_ints, bool, 0444); 2438 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2439 module_param(broken_psr, bool, 0444); 2440 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2441 module_param(realmode_power_off, bool, 0444); 2442 MODULE_PARM_DESC(realmode_power_off, 2443 "Switch to real mode before powering off"); 2444 module_param(idle_threshold, int, 0444); 2445 MODULE_PARM_DESC(idle_threshold, 2446 "System idle percentage above which to make APM BIOS idle calls"); 2447 module_param(idle_period, int, 0444); 2448 MODULE_PARM_DESC(idle_period, 2449 "Period (in sec/100) over which to caculate the idle percentage"); 2450 module_param(smp, bool, 0444); 2451 MODULE_PARM_DESC(smp, 2452 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2453 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2454