1 /* -*- linux-c -*- 2 * APM BIOS driver for Linux 3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au) 4 * 5 * Initial development of this driver was funded by NEC Australia P/L 6 * and NEC Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2, or (at your option) any 11 * later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * October 1995, Rik Faith (faith@cs.unc.edu): 19 * Minor enhancements and updates (to the patch set) for 1.3.x 20 * Documentation 21 * January 1996, Rik Faith (faith@cs.unc.edu): 22 * Make /proc/apm easy to format (bump driver version) 23 * March 1996, Rik Faith (faith@cs.unc.edu): 24 * Prohibit APM BIOS calls unless apm_enabled. 25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>) 26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au) 27 * Version 1.0 and 1.1 28 * May 1996, Version 1.2 29 * Feb 1998, Version 1.3 30 * Feb 1998, Version 1.4 31 * Aug 1998, Version 1.5 32 * Sep 1998, Version 1.6 33 * Nov 1998, Version 1.7 34 * Jan 1999, Version 1.8 35 * Jan 1999, Version 1.9 36 * Oct 1999, Version 1.10 37 * Nov 1999, Version 1.11 38 * Jan 2000, Version 1.12 39 * Feb 2000, Version 1.13 40 * Nov 2000, Version 1.14 41 * Oct 2001, Version 1.15 42 * Jan 2002, Version 1.16 43 * Oct 2002, Version 1.16ac 44 * 45 * History: 46 * 0.6b: first version in official kernel, Linux 1.3.46 47 * 0.7: changed /proc/apm format, Linux 1.3.58 48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59 49 * 0.9: only call bios if bios is present, Linux 1.3.72 50 * 1.0: use fixed device number, consolidate /proc/apm into this file, 51 * Linux 1.3.85 52 * 1.1: support user-space standby and suspend, power off after system 53 * halted, Linux 1.3.98 54 * 1.2: When resetting RTC after resume, take care so that the time 55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth 56 * <jtoth@princeton.edu>); improve interaction between 57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4 58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added 59 * levels to the printk calls. APM is not defined for SMP machines. 60 * The new replacement for it is, but Linux doesn't yet support this. 61 * Alan Cox Linux 2.1.55 62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's 63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by 64 * Dean Gaudet <dgaudet@arctic.org>. 65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87 66 * 1.5: Fix segment register reloading (in case of bad segments saved 67 * across BIOS call). 68 * Stephen Rothwell 69 * 1.6: Cope with compiler/assembler differences. 70 * Only try to turn off the first display device. 71 * Fix OOPS at power off with no APM BIOS by Jan Echternach 72 * <echter@informatik.uni-rostock.de> 73 * Stephen Rothwell 74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags 75 * to reflect current state of APM BIOS. 76 * Chris Rankin <rankinc@bellsouth.net> 77 * Reset interrupt 0 timer to 100Hz after suspend 78 * Chad Miller <cmiller@surfsouth.com> 79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE 80 * Richard Gooch <rgooch@atnf.csiro.au> 81 * Allow boot time disabling of APM 82 * Make boot messages far less verbose by default 83 * Make asm safer 84 * Stephen Rothwell 85 * 1.8: Add CONFIG_APM_RTC_IS_GMT 86 * Richard Gooch <rgooch@atnf.csiro.au> 87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS 88 * remove dependency on CONFIG_PROC_FS 89 * Stephen Rothwell 90 * 1.9: Fix small typo. <laslo@wodip.opole.pl> 91 * Try to cope with BIOS's that need to have all display 92 * devices blanked and not just the first one. 93 * Ross Paterson <ross@soi.city.ac.uk> 94 * Fix segment limit setting it has always been wrong as 95 * the segments needed to have byte granularity. 96 * Mark a few things __init. 97 * Add hack to allow power off of SMP systems by popular request. 98 * Use CONFIG_SMP instead of __SMP__ 99 * Ignore BOUNCES for three seconds. 100 * Stephen Rothwell 101 * 1.10: Fix for Thinkpad return code. 102 * Merge 2.2 and 2.3 drivers. 103 * Remove APM dependencies in arch/i386/kernel/process.c 104 * Remove APM dependencies in drivers/char/sysrq.c 105 * Reset time across standby. 106 * Allow more inititialisation on SMP. 107 * Remove CONFIG_APM_POWER_OFF and make it boot time 108 * configurable (default on). 109 * Make debug only a boot time parameter (remove APM_DEBUG). 110 * Try to blank all devices on any error. 111 * 1.11: Remove APM dependencies in drivers/char/console.c 112 * Check nr_running to detect if we are idle (from 113 * Borislav Deianov <borislav@lix.polytechnique.fr>) 114 * Fix for bioses that don't zero the top part of the 115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>) 116 * (reported by Panos Katsaloulis <teras@writeme.com>). 117 * Real mode power off patch (Walter Hofmann 118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>). 119 * 1.12: Remove CONFIG_SMP as the compiler will optimize 120 * the code away anyway (smp_num_cpus == 1 in UP) 121 * noted by Artur Skawina <skawina@geocities.com>. 122 * Make power off under SMP work again. 123 * Fix thinko with initial engaging of BIOS. 124 * Make sure power off only happens on CPU 0 125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>). 126 * Do error notification to user mode if BIOS calls fail. 127 * Move entrypoint offset fix to ...boot/setup.S 128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>). 129 * Remove smp-power-off. SMP users must now specify 130 * "apm=power-off" on the kernel command line. Suggested 131 * by Jim Avera <jima@hal.com>, modified by Alan Cox 132 * <alan@lxorguk.ukuu.org.uk>. 133 * Register the /proc/apm entry even on SMP so that 134 * scripts that check for it before doing power off 135 * work (Jim Avera <jima@hal.com>). 136 * 1.13: Changes for new pm_ interfaces (Andy Henroid 137 * <andy_henroid@yahoo.com>). 138 * Modularize the code. 139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS 140 * is now the way life works). 141 * Fix thinko in suspend() (wrong return). 142 * Notify drivers on critical suspend. 143 * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz> 144 * modified by sfr). 145 * Disable interrupts while we are suspended (Andy Henroid 146 * <andy_henroid@yahoo.com> fixed by sfr). 147 * Make power off work on SMP again (Tony Hoyle 148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr. 149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore 150 * interval is now configurable. 151 * 1.14: Make connection version persist across module unload/load. 152 * Enable and engage power management earlier. 153 * Disengage power management on module unload. 154 * Changed to use the sysrq-register hack for registering the 155 * power off function called by magic sysrq based upon discussions 156 * in irc://irc.openprojects.net/#kernelnewbies 157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>). 158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable. 159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr. 160 * Work around byte swap bug in one of the Vaio's BIOS's 161 * (Marc Boucher <marc@mbsi.ca>). 162 * Exposed the disable flag to dmi so that we can handle known 163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). 164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin 165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) 166 * If an APM idle fails log it and idle sensibly 167 * 1.15: Don't queue events to clients who open the device O_WRONLY. 168 * Don't expect replies from clients who open the device O_RDONLY. 169 * (Idea from Thomas Hood) 170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>) 171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.) 172 * Notify listeners of standby or suspend events before notifying 173 * drivers. Return EBUSY to ioctl() if suspend is rejected. 174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood) 175 * Ignore first resume after we generate our own resume event 176 * after a suspend (Thomas Hood) 177 * Daemonize now gets rid of our controlling terminal (sfr). 178 * CONFIG_APM_CPU_IDLE now just affects the default value of 179 * idle_threshold (sfr). 180 * Change name of kernel apm daemon (as it no longer idles) (sfr). 181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we 182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. 183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. 184 * 185 * APM 1.1 Reference: 186 * 187 * Intel Corporation, Microsoft Corporation. Advanced Power Management 188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993. 189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01. 190 * 191 * [This document is available free from Intel by calling 800.628.8686 (fax 192 * 916.356.6100) or 800.548.4725; or from 193 * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also 194 * available from Microsoft by calling 206.882.8080.] 195 * 196 * APM 1.2 Reference: 197 * Intel Corporation, Microsoft Corporation. Advanced Power Management 198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996. 199 * 200 * [This document is available from Microsoft at: 201 * http://www.microsoft.com/whdc/archive/amp_12.mspx] 202 */ 203 204 #define pr_fmt(fmt) "apm: " fmt 205 206 #include <linux/module.h> 207 208 #include <linux/poll.h> 209 #include <linux/types.h> 210 #include <linux/stddef.h> 211 #include <linux/timer.h> 212 #include <linux/fcntl.h> 213 #include <linux/slab.h> 214 #include <linux/stat.h> 215 #include <linux/proc_fs.h> 216 #include <linux/seq_file.h> 217 #include <linux/miscdevice.h> 218 #include <linux/apm_bios.h> 219 #include <linux/init.h> 220 #include <linux/time.h> 221 #include <linux/sched.h> 222 #include <linux/pm.h> 223 #include <linux/capability.h> 224 #include <linux/device.h> 225 #include <linux/kernel.h> 226 #include <linux/freezer.h> 227 #include <linux/smp.h> 228 #include <linux/dmi.h> 229 #include <linux/suspend.h> 230 #include <linux/kthread.h> 231 #include <linux/jiffies.h> 232 #include <linux/acpi.h> 233 #include <linux/syscore_ops.h> 234 #include <linux/i8253.h> 235 #include <linux/cpuidle.h> 236 237 #include <asm/uaccess.h> 238 #include <asm/desc.h> 239 #include <asm/olpc.h> 240 #include <asm/paravirt.h> 241 #include <asm/reboot.h> 242 243 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 244 extern int (*console_blank_hook)(int); 245 #endif 246 247 /* 248 * The apm_bios device is one of the misc char devices. 249 * This is its minor number. 250 */ 251 #define APM_MINOR_DEV 134 252 253 /* 254 * Various options can be changed at boot time as follows: 255 * (We allow underscores for compatibility with the modules code) 256 * apm=on/off enable/disable APM 257 * [no-]allow[-_]ints allow interrupts during BIOS calls 258 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call 259 * [no-]realmode[-_]power[-_]off switch to real mode before 260 * powering off 261 * [no-]debug log some debugging messages 262 * [no-]power[-_]off power off on shutdown 263 * [no-]smp Use apm even on an SMP box 264 * bounce[-_]interval=<n> number of ticks to ignore suspend 265 * bounces 266 * idle[-_]threshold=<n> System idle percentage above which to 267 * make APM BIOS idle calls. Set it to 268 * 100 to disable. 269 * idle[-_]period=<n> Period (in 1/100s of a second) over 270 * which the idle percentage is 271 * calculated. 272 */ 273 274 /* KNOWN PROBLEM MACHINES: 275 * 276 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant 277 * [Confirmed by TI representative] 278 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification 279 * [Confirmed by BIOS disassembly] 280 * [This may work now ...] 281 * P: Toshiba 1950S: battery life information only gets updated after resume 282 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking 283 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] 284 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP 285 * Neale Banks <neale@lowendale.com.au> December 2000 286 * 287 * Legend: U = unusable with APM patches 288 * P = partially usable with APM patches 289 */ 290 291 /* 292 * Define as 1 to make the driver always call the APM BIOS busy 293 * routine even if the clock was not reported as slowed by the 294 * idle routine. Otherwise, define as 0. 295 */ 296 #define ALWAYS_CALL_BUSY 1 297 298 /* 299 * Define to make the APM BIOS calls zero all data segment registers (so 300 * that an incorrect BIOS implementation will cause a kernel panic if it 301 * tries to write to arbitrary memory). 302 */ 303 #define APM_ZERO_SEGS 304 305 #include <asm/apm.h> 306 307 /* 308 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. 309 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by 310 * David Chen <chen@ctpa04.mit.edu> 311 */ 312 #undef INIT_TIMER_AFTER_SUSPEND 313 314 #ifdef INIT_TIMER_AFTER_SUSPEND 315 #include <linux/timex.h> 316 #include <asm/io.h> 317 #include <linux/delay.h> 318 #endif 319 320 /* 321 * Need to poll the APM BIOS every second 322 */ 323 #define APM_CHECK_TIMEOUT (HZ) 324 325 /* 326 * Ignore suspend events for this amount of time after a resume 327 */ 328 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) 329 330 /* 331 * Maximum number of events stored 332 */ 333 #define APM_MAX_EVENTS 20 334 335 /* 336 * The per-file APM data 337 */ 338 struct apm_user { 339 int magic; 340 struct apm_user *next; 341 unsigned int suser: 1; 342 unsigned int writer: 1; 343 unsigned int reader: 1; 344 unsigned int suspend_wait: 1; 345 int suspend_result; 346 int suspends_pending; 347 int standbys_pending; 348 int suspends_read; 349 int standbys_read; 350 int event_head; 351 int event_tail; 352 apm_event_t events[APM_MAX_EVENTS]; 353 }; 354 355 /* 356 * The magic number in apm_user 357 */ 358 #define APM_BIOS_MAGIC 0x4101 359 360 /* 361 * idle percentage above which bios idle calls are done 362 */ 363 #ifdef CONFIG_APM_CPU_IDLE 364 #define DEFAULT_IDLE_THRESHOLD 95 365 #else 366 #define DEFAULT_IDLE_THRESHOLD 100 367 #endif 368 #define DEFAULT_IDLE_PERIOD (100 / 3) 369 370 static int apm_cpu_idle(struct cpuidle_device *dev, 371 struct cpuidle_driver *drv, int index); 372 373 static struct cpuidle_driver apm_idle_driver = { 374 .name = "apm_idle", 375 .owner = THIS_MODULE, 376 .states = { 377 { /* entry 0 is for polling */ }, 378 { /* entry 1 is for APM idle */ 379 .name = "APM", 380 .desc = "APM idle", 381 .flags = CPUIDLE_FLAG_TIME_VALID, 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_table(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_table(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 polling; 845 int err = 0; 846 847 polling = !!(current_thread_info()->status & TS_POLLING); 848 if (polling) { 849 current_thread_info()->status &= ~TS_POLLING; 850 /* 851 * TS_POLLING-cleared state must be visible before we 852 * test NEED_RESCHED: 853 */ 854 smp_mb(); 855 } 856 if (!need_resched()) { 857 idled = 1; 858 ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); 859 } 860 if (polling) 861 current_thread_info()->status |= TS_POLLING; 862 863 if (!idled) 864 return 0; 865 866 if (ret) { 867 static unsigned long t; 868 869 /* This always fails on some SMP boards running UP kernels. 870 * Only report the failure the first 5 times. 871 */ 872 if (++t < 5) { 873 printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); 874 t = jiffies; 875 } 876 return -1; 877 } 878 clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; 879 return clock_slowed; 880 } 881 882 /** 883 * apm_do_busy - inform the BIOS the CPU is busy 884 * 885 * Request that the BIOS brings the CPU back to full performance. 886 */ 887 888 static void apm_do_busy(void) 889 { 890 u32 dummy; 891 int err; 892 893 if (clock_slowed || ALWAYS_CALL_BUSY) { 894 (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); 895 clock_slowed = 0; 896 } 897 } 898 899 /* 900 * If no process has really been interested in 901 * the CPU for some time, we want to call BIOS 902 * power management - we probably want 903 * to conserve power. 904 */ 905 #define IDLE_CALC_LIMIT (HZ * 100) 906 #define IDLE_LEAKY_MAX 16 907 908 /** 909 * apm_cpu_idle - cpu idling for APM capable Linux 910 * 911 * This is the idling function the kernel executes when APM is available. It 912 * tries to do BIOS powermanagement based on the average system idle time. 913 * Furthermore it calls the system default idle routine. 914 */ 915 916 static int apm_cpu_idle(struct cpuidle_device *dev, 917 struct cpuidle_driver *drv, int index) 918 { 919 static int use_apm_idle; /* = 0 */ 920 static unsigned int last_jiffies; /* = 0 */ 921 static unsigned int last_stime; /* = 0 */ 922 cputime_t stime; 923 924 int apm_idle_done = 0; 925 unsigned int jiffies_since_last_check = jiffies - last_jiffies; 926 unsigned int bucket; 927 928 recalc: 929 task_cputime(current, NULL, &stime); 930 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 931 use_apm_idle = 0; 932 } else if (jiffies_since_last_check > idle_period) { 933 unsigned int idle_percentage; 934 935 idle_percentage = stime - last_stime; 936 idle_percentage *= 100; 937 idle_percentage /= jiffies_since_last_check; 938 use_apm_idle = (idle_percentage > idle_threshold); 939 if (apm_info.forbid_idle) 940 use_apm_idle = 0; 941 } 942 943 last_jiffies = jiffies; 944 last_stime = stime; 945 946 bucket = IDLE_LEAKY_MAX; 947 948 while (!need_resched()) { 949 if (use_apm_idle) { 950 unsigned int t; 951 952 t = jiffies; 953 switch (apm_do_idle()) { 954 case 0: 955 apm_idle_done = 1; 956 if (t != jiffies) { 957 if (bucket) { 958 bucket = IDLE_LEAKY_MAX; 959 continue; 960 } 961 } else if (bucket) { 962 bucket--; 963 continue; 964 } 965 break; 966 case 1: 967 apm_idle_done = 1; 968 break; 969 default: /* BIOS refused */ 970 break; 971 } 972 } 973 default_idle(); 974 local_irq_disable(); 975 jiffies_since_last_check = jiffies - last_jiffies; 976 if (jiffies_since_last_check > idle_period) 977 goto recalc; 978 } 979 980 if (apm_idle_done) 981 apm_do_busy(); 982 983 return index; 984 } 985 986 /** 987 * apm_power_off - ask the BIOS to power off 988 * 989 * Handle the power off sequence. This is the one piece of code we 990 * will execute even on SMP machines. In order to deal with BIOS 991 * bugs we support real mode APM BIOS power off calls. We also make 992 * the SMP call on CPU0 as some systems will only honour this call 993 * on their first cpu. 994 */ 995 996 static void apm_power_off(void) 997 { 998 /* Some bioses don't like being called from CPU != 0 */ 999 if (apm_info.realmode_power_off) { 1000 set_cpus_allowed_ptr(current, cpumask_of(0)); 1001 machine_real_restart(MRR_APM); 1002 } else { 1003 (void)set_system_power_state(APM_STATE_OFF); 1004 } 1005 } 1006 1007 #ifdef CONFIG_APM_DO_ENABLE 1008 1009 /** 1010 * apm_enable_power_management - enable BIOS APM power management 1011 * @enable: enable yes/no 1012 * 1013 * Enable or disable the APM BIOS power services. 1014 */ 1015 1016 static int apm_enable_power_management(int enable) 1017 { 1018 u32 eax; 1019 int err; 1020 1021 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 1022 return APM_NOT_ENGAGED; 1023 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 1024 enable, &eax, &err)) 1025 return err; 1026 if (enable) 1027 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 1028 else 1029 apm_info.bios.flags |= APM_BIOS_DISABLED; 1030 return APM_SUCCESS; 1031 } 1032 #endif 1033 1034 /** 1035 * apm_get_power_status - get current power state 1036 * @status: returned status 1037 * @bat: battery info 1038 * @life: estimated life 1039 * 1040 * Obtain the current power status from the APM BIOS. We return a 1041 * status which gives the rough battery status, and current power 1042 * source. The bat value returned give an estimate as a percentage 1043 * of life and a status value for the battery. The estimated life 1044 * if reported is a lifetime in secodnds/minutes at current powwer 1045 * consumption. 1046 */ 1047 1048 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 1049 { 1050 struct apm_bios_call call; 1051 1052 call.func = APM_FUNC_GET_STATUS; 1053 call.ebx = APM_DEVICE_ALL; 1054 call.ecx = 0; 1055 1056 if (apm_info.get_power_status_broken) 1057 return APM_32_UNSUPPORTED; 1058 if (apm_bios_call(&call)) 1059 return call.err; 1060 *status = call.ebx; 1061 *bat = call.ecx; 1062 if (apm_info.get_power_status_swabinminutes) { 1063 *life = swab16((u16)call.edx); 1064 *life |= 0x8000; 1065 } else 1066 *life = call.edx; 1067 return APM_SUCCESS; 1068 } 1069 1070 #if 0 1071 static int apm_get_battery_status(u_short which, u_short *status, 1072 u_short *bat, u_short *life, u_short *nbat) 1073 { 1074 u32 eax; 1075 u32 ebx; 1076 u32 ecx; 1077 u32 edx; 1078 u32 esi; 1079 1080 if (apm_info.connection_version < 0x0102) { 1081 /* pretend we only have one battery. */ 1082 if (which != 1) 1083 return APM_BAD_DEVICE; 1084 *nbat = 1; 1085 return apm_get_power_status(status, bat, life); 1086 } 1087 1088 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1089 &ebx, &ecx, &edx, &esi)) 1090 return (eax >> 8) & 0xff; 1091 *status = ebx; 1092 *bat = ecx; 1093 *life = edx; 1094 *nbat = esi; 1095 return APM_SUCCESS; 1096 } 1097 #endif 1098 1099 /** 1100 * apm_engage_power_management - enable PM on a device 1101 * @device: identity of device 1102 * @enable: on/off 1103 * 1104 * Activate or deactive power management on either a specific device 1105 * or the entire system (%APM_DEVICE_ALL). 1106 */ 1107 1108 static int apm_engage_power_management(u_short device, int enable) 1109 { 1110 u32 eax; 1111 int err; 1112 1113 if ((enable == 0) && (device == APM_DEVICE_ALL) 1114 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1115 return APM_DISABLED; 1116 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, 1117 &eax, &err)) 1118 return err; 1119 if (device == APM_DEVICE_ALL) { 1120 if (enable) 1121 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1122 else 1123 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1124 } 1125 return APM_SUCCESS; 1126 } 1127 1128 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1129 1130 /** 1131 * apm_console_blank - blank the display 1132 * @blank: on/off 1133 * 1134 * Attempt to blank the console, firstly by blanking just video device 1135 * zero, and if that fails (some BIOSes don't support it) then it blanks 1136 * all video devices. Typically the BIOS will do laptop backlight and 1137 * monitor powerdown for us. 1138 */ 1139 1140 static int apm_console_blank(int blank) 1141 { 1142 int error = APM_NOT_ENGAGED; /* silence gcc */ 1143 int i; 1144 u_short state; 1145 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1146 1147 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1148 1149 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1150 error = set_power_state(dev[i], state); 1151 1152 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1153 return 1; 1154 1155 if (error == APM_NOT_ENGAGED) 1156 break; 1157 } 1158 1159 if (error == APM_NOT_ENGAGED) { 1160 static int tried; 1161 int eng_error; 1162 if (tried++ == 0) { 1163 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1164 if (eng_error) { 1165 apm_error("set display", error); 1166 apm_error("engage interface", eng_error); 1167 return 0; 1168 } else 1169 return apm_console_blank(blank); 1170 } 1171 } 1172 apm_error("set display", error); 1173 return 0; 1174 } 1175 #endif 1176 1177 static int queue_empty(struct apm_user *as) 1178 { 1179 return as->event_head == as->event_tail; 1180 } 1181 1182 static apm_event_t get_queued_event(struct apm_user *as) 1183 { 1184 if (++as->event_tail >= APM_MAX_EVENTS) 1185 as->event_tail = 0; 1186 return as->events[as->event_tail]; 1187 } 1188 1189 static void queue_event(apm_event_t event, struct apm_user *sender) 1190 { 1191 struct apm_user *as; 1192 1193 spin_lock(&user_list_lock); 1194 if (user_list == NULL) 1195 goto out; 1196 for (as = user_list; as != NULL; as = as->next) { 1197 if ((as == sender) || (!as->reader)) 1198 continue; 1199 if (++as->event_head >= APM_MAX_EVENTS) 1200 as->event_head = 0; 1201 1202 if (as->event_head == as->event_tail) { 1203 static int notified; 1204 1205 if (notified++ == 0) 1206 pr_err("an event queue overflowed\n"); 1207 if (++as->event_tail >= APM_MAX_EVENTS) 1208 as->event_tail = 0; 1209 } 1210 as->events[as->event_head] = event; 1211 if (!as->suser || !as->writer) 1212 continue; 1213 switch (event) { 1214 case APM_SYS_SUSPEND: 1215 case APM_USER_SUSPEND: 1216 as->suspends_pending++; 1217 suspends_pending++; 1218 break; 1219 1220 case APM_SYS_STANDBY: 1221 case APM_USER_STANDBY: 1222 as->standbys_pending++; 1223 standbys_pending++; 1224 break; 1225 } 1226 } 1227 wake_up_interruptible(&apm_waitqueue); 1228 out: 1229 spin_unlock(&user_list_lock); 1230 } 1231 1232 static void reinit_timer(void) 1233 { 1234 #ifdef INIT_TIMER_AFTER_SUSPEND 1235 unsigned long flags; 1236 1237 raw_spin_lock_irqsave(&i8253_lock, flags); 1238 /* set the clock to HZ */ 1239 outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1240 udelay(10); 1241 outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ 1242 udelay(10); 1243 outb_p(LATCH >> 8, PIT_CH0); /* MSB */ 1244 udelay(10); 1245 raw_spin_unlock_irqrestore(&i8253_lock, flags); 1246 #endif 1247 } 1248 1249 static int suspend(int vetoable) 1250 { 1251 int err; 1252 struct apm_user *as; 1253 1254 dpm_suspend_start(PMSG_SUSPEND); 1255 dpm_suspend_end(PMSG_SUSPEND); 1256 1257 local_irq_disable(); 1258 syscore_suspend(); 1259 1260 local_irq_enable(); 1261 1262 save_processor_state(); 1263 err = set_system_power_state(APM_STATE_SUSPEND); 1264 ignore_normal_resume = 1; 1265 restore_processor_state(); 1266 1267 local_irq_disable(); 1268 reinit_timer(); 1269 1270 if (err == APM_NO_ERROR) 1271 err = APM_SUCCESS; 1272 if (err != APM_SUCCESS) 1273 apm_error("suspend", err); 1274 err = (err == APM_SUCCESS) ? 0 : -EIO; 1275 1276 syscore_resume(); 1277 local_irq_enable(); 1278 1279 dpm_resume_start(PMSG_RESUME); 1280 dpm_resume_end(PMSG_RESUME); 1281 1282 queue_event(APM_NORMAL_RESUME, NULL); 1283 spin_lock(&user_list_lock); 1284 for (as = user_list; as != NULL; as = as->next) { 1285 as->suspend_wait = 0; 1286 as->suspend_result = err; 1287 } 1288 spin_unlock(&user_list_lock); 1289 wake_up_interruptible(&apm_suspend_waitqueue); 1290 return err; 1291 } 1292 1293 static void standby(void) 1294 { 1295 int err; 1296 1297 dpm_suspend_end(PMSG_SUSPEND); 1298 1299 local_irq_disable(); 1300 syscore_suspend(); 1301 local_irq_enable(); 1302 1303 err = set_system_power_state(APM_STATE_STANDBY); 1304 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1305 apm_error("standby", err); 1306 1307 local_irq_disable(); 1308 syscore_resume(); 1309 local_irq_enable(); 1310 1311 dpm_resume_start(PMSG_RESUME); 1312 } 1313 1314 static apm_event_t get_event(void) 1315 { 1316 int error; 1317 apm_event_t event = APM_NO_EVENTS; /* silence gcc */ 1318 apm_eventinfo_t info; 1319 1320 static int notified; 1321 1322 /* we don't use the eventinfo */ 1323 error = apm_get_event(&event, &info); 1324 if (error == APM_SUCCESS) 1325 return event; 1326 1327 if ((error != APM_NO_EVENTS) && (notified++ == 0)) 1328 apm_error("get_event", error); 1329 1330 return 0; 1331 } 1332 1333 static void check_events(void) 1334 { 1335 apm_event_t event; 1336 static unsigned long last_resume; 1337 static int ignore_bounce; 1338 1339 while ((event = get_event()) != 0) { 1340 if (debug) { 1341 if (event <= NR_APM_EVENT_NAME) 1342 printk(KERN_DEBUG "apm: received %s notify\n", 1343 apm_event_name[event - 1]); 1344 else 1345 printk(KERN_DEBUG "apm: received unknown " 1346 "event 0x%02x\n", event); 1347 } 1348 if (ignore_bounce 1349 && (time_after(jiffies, last_resume + bounce_interval))) 1350 ignore_bounce = 0; 1351 1352 switch (event) { 1353 case APM_SYS_STANDBY: 1354 case APM_USER_STANDBY: 1355 queue_event(event, NULL); 1356 if (standbys_pending <= 0) 1357 standby(); 1358 break; 1359 1360 case APM_USER_SUSPEND: 1361 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND 1362 if (apm_info.connection_version > 0x100) 1363 set_system_power_state(APM_STATE_REJECT); 1364 break; 1365 #endif 1366 case APM_SYS_SUSPEND: 1367 if (ignore_bounce) { 1368 if (apm_info.connection_version > 0x100) 1369 set_system_power_state(APM_STATE_REJECT); 1370 break; 1371 } 1372 /* 1373 * If we are already processing a SUSPEND, 1374 * then further SUSPEND events from the BIOS 1375 * will be ignored. We also return here to 1376 * cope with the fact that the Thinkpads keep 1377 * sending a SUSPEND event until something else 1378 * happens! 1379 */ 1380 if (ignore_sys_suspend) 1381 return; 1382 ignore_sys_suspend = 1; 1383 queue_event(event, NULL); 1384 if (suspends_pending <= 0) 1385 (void) suspend(1); 1386 break; 1387 1388 case APM_NORMAL_RESUME: 1389 case APM_CRITICAL_RESUME: 1390 case APM_STANDBY_RESUME: 1391 ignore_sys_suspend = 0; 1392 last_resume = jiffies; 1393 ignore_bounce = 1; 1394 if ((event != APM_NORMAL_RESUME) 1395 || (ignore_normal_resume == 0)) { 1396 dpm_resume_end(PMSG_RESUME); 1397 queue_event(event, NULL); 1398 } 1399 ignore_normal_resume = 0; 1400 break; 1401 1402 case APM_CAPABILITY_CHANGE: 1403 case APM_LOW_BATTERY: 1404 case APM_POWER_STATUS_CHANGE: 1405 queue_event(event, NULL); 1406 /* If needed, notify drivers here */ 1407 break; 1408 1409 case APM_UPDATE_TIME: 1410 break; 1411 1412 case APM_CRITICAL_SUSPEND: 1413 /* 1414 * We are not allowed to reject a critical suspend. 1415 */ 1416 (void)suspend(0); 1417 break; 1418 } 1419 } 1420 } 1421 1422 static void apm_event_handler(void) 1423 { 1424 static int pending_count = 4; 1425 int err; 1426 1427 if ((standbys_pending > 0) || (suspends_pending > 0)) { 1428 if ((apm_info.connection_version > 0x100) && 1429 (pending_count-- <= 0)) { 1430 pending_count = 4; 1431 if (debug) 1432 printk(KERN_DEBUG "apm: setting state busy\n"); 1433 err = set_system_power_state(APM_STATE_BUSY); 1434 if (err) 1435 apm_error("busy", err); 1436 } 1437 } else 1438 pending_count = 4; 1439 check_events(); 1440 } 1441 1442 /* 1443 * This is the APM thread main loop. 1444 */ 1445 1446 static void apm_mainloop(void) 1447 { 1448 DECLARE_WAITQUEUE(wait, current); 1449 1450 add_wait_queue(&apm_waitqueue, &wait); 1451 set_current_state(TASK_INTERRUPTIBLE); 1452 for (;;) { 1453 schedule_timeout(APM_CHECK_TIMEOUT); 1454 if (kthread_should_stop()) 1455 break; 1456 /* 1457 * Ok, check all events, check for idle (and mark us sleeping 1458 * so as not to count towards the load average).. 1459 */ 1460 set_current_state(TASK_INTERRUPTIBLE); 1461 apm_event_handler(); 1462 } 1463 remove_wait_queue(&apm_waitqueue, &wait); 1464 } 1465 1466 static int check_apm_user(struct apm_user *as, const char *func) 1467 { 1468 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1469 pr_err("%s passed bad filp\n", func); 1470 return 1; 1471 } 1472 return 0; 1473 } 1474 1475 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) 1476 { 1477 struct apm_user *as; 1478 int i; 1479 apm_event_t event; 1480 1481 as = fp->private_data; 1482 if (check_apm_user(as, "read")) 1483 return -EIO; 1484 if ((int)count < sizeof(apm_event_t)) 1485 return -EINVAL; 1486 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) 1487 return -EAGAIN; 1488 wait_event_interruptible(apm_waitqueue, !queue_empty(as)); 1489 i = count; 1490 while ((i >= sizeof(event)) && !queue_empty(as)) { 1491 event = get_queued_event(as); 1492 if (copy_to_user(buf, &event, sizeof(event))) { 1493 if (i < count) 1494 break; 1495 return -EFAULT; 1496 } 1497 switch (event) { 1498 case APM_SYS_SUSPEND: 1499 case APM_USER_SUSPEND: 1500 as->suspends_read++; 1501 break; 1502 1503 case APM_SYS_STANDBY: 1504 case APM_USER_STANDBY: 1505 as->standbys_read++; 1506 break; 1507 } 1508 buf += sizeof(event); 1509 i -= sizeof(event); 1510 } 1511 if (i < count) 1512 return count - i; 1513 if (signal_pending(current)) 1514 return -ERESTARTSYS; 1515 return 0; 1516 } 1517 1518 static unsigned int do_poll(struct file *fp, poll_table *wait) 1519 { 1520 struct apm_user *as; 1521 1522 as = fp->private_data; 1523 if (check_apm_user(as, "poll")) 1524 return 0; 1525 poll_wait(fp, &apm_waitqueue, wait); 1526 if (!queue_empty(as)) 1527 return POLLIN | POLLRDNORM; 1528 return 0; 1529 } 1530 1531 static long do_ioctl(struct file *filp, u_int cmd, u_long arg) 1532 { 1533 struct apm_user *as; 1534 int ret; 1535 1536 as = filp->private_data; 1537 if (check_apm_user(as, "ioctl")) 1538 return -EIO; 1539 if (!as->suser || !as->writer) 1540 return -EPERM; 1541 switch (cmd) { 1542 case APM_IOC_STANDBY: 1543 mutex_lock(&apm_mutex); 1544 if (as->standbys_read > 0) { 1545 as->standbys_read--; 1546 as->standbys_pending--; 1547 standbys_pending--; 1548 } else 1549 queue_event(APM_USER_STANDBY, as); 1550 if (standbys_pending <= 0) 1551 standby(); 1552 mutex_unlock(&apm_mutex); 1553 break; 1554 case APM_IOC_SUSPEND: 1555 mutex_lock(&apm_mutex); 1556 if (as->suspends_read > 0) { 1557 as->suspends_read--; 1558 as->suspends_pending--; 1559 suspends_pending--; 1560 } else 1561 queue_event(APM_USER_SUSPEND, as); 1562 if (suspends_pending <= 0) { 1563 ret = suspend(1); 1564 mutex_unlock(&apm_mutex); 1565 } else { 1566 as->suspend_wait = 1; 1567 mutex_unlock(&apm_mutex); 1568 wait_event_interruptible(apm_suspend_waitqueue, 1569 as->suspend_wait == 0); 1570 ret = as->suspend_result; 1571 } 1572 return ret; 1573 default: 1574 return -ENOTTY; 1575 } 1576 return 0; 1577 } 1578 1579 static int do_release(struct inode *inode, struct file *filp) 1580 { 1581 struct apm_user *as; 1582 1583 as = filp->private_data; 1584 if (check_apm_user(as, "release")) 1585 return 0; 1586 filp->private_data = NULL; 1587 if (as->standbys_pending > 0) { 1588 standbys_pending -= as->standbys_pending; 1589 if (standbys_pending <= 0) 1590 standby(); 1591 } 1592 if (as->suspends_pending > 0) { 1593 suspends_pending -= as->suspends_pending; 1594 if (suspends_pending <= 0) 1595 (void) suspend(1); 1596 } 1597 spin_lock(&user_list_lock); 1598 if (user_list == as) 1599 user_list = as->next; 1600 else { 1601 struct apm_user *as1; 1602 1603 for (as1 = user_list; 1604 (as1 != NULL) && (as1->next != as); 1605 as1 = as1->next) 1606 ; 1607 if (as1 == NULL) 1608 pr_err("filp not in user list\n"); 1609 else 1610 as1->next = as->next; 1611 } 1612 spin_unlock(&user_list_lock); 1613 kfree(as); 1614 return 0; 1615 } 1616 1617 static int do_open(struct inode *inode, struct file *filp) 1618 { 1619 struct apm_user *as; 1620 1621 as = kmalloc(sizeof(*as), GFP_KERNEL); 1622 if (as == NULL) 1623 return -ENOMEM; 1624 1625 as->magic = APM_BIOS_MAGIC; 1626 as->event_tail = as->event_head = 0; 1627 as->suspends_pending = as->standbys_pending = 0; 1628 as->suspends_read = as->standbys_read = 0; 1629 /* 1630 * XXX - this is a tiny bit broken, when we consider BSD 1631 * process accounting. If the device is opened by root, we 1632 * instantly flag that we used superuser privs. Who knows, 1633 * we might close the device immediately without doing a 1634 * privileged operation -- cevans 1635 */ 1636 as->suser = capable(CAP_SYS_ADMIN); 1637 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1638 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1639 spin_lock(&user_list_lock); 1640 as->next = user_list; 1641 user_list = as; 1642 spin_unlock(&user_list_lock); 1643 filp->private_data = as; 1644 return 0; 1645 } 1646 1647 static int proc_apm_show(struct seq_file *m, void *v) 1648 { 1649 unsigned short bx; 1650 unsigned short cx; 1651 unsigned short dx; 1652 int error; 1653 unsigned short ac_line_status = 0xff; 1654 unsigned short battery_status = 0xff; 1655 unsigned short battery_flag = 0xff; 1656 int percentage = -1; 1657 int time_units = -1; 1658 char *units = "?"; 1659 1660 if ((num_online_cpus() == 1) && 1661 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1662 ac_line_status = (bx >> 8) & 0xff; 1663 battery_status = bx & 0xff; 1664 if ((cx & 0xff) != 0xff) 1665 percentage = cx & 0xff; 1666 1667 if (apm_info.connection_version > 0x100) { 1668 battery_flag = (cx >> 8) & 0xff; 1669 if (dx != 0xffff) { 1670 units = (dx & 0x8000) ? "min" : "sec"; 1671 time_units = dx & 0x7fff; 1672 } 1673 } 1674 } 1675 /* Arguments, with symbols from linux/apm_bios.h. Information is 1676 from the Get Power Status (0x0a) call unless otherwise noted. 1677 1678 0) Linux driver version (this will change if format changes) 1679 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1680 2) APM flags from APM Installation Check (0x00): 1681 bit 0: APM_16_BIT_SUPPORT 1682 bit 1: APM_32_BIT_SUPPORT 1683 bit 2: APM_IDLE_SLOWS_CLOCK 1684 bit 3: APM_BIOS_DISABLED 1685 bit 4: APM_BIOS_DISENGAGED 1686 3) AC line status 1687 0x00: Off-line 1688 0x01: On-line 1689 0x02: On backup power (BIOS >= 1.1 only) 1690 0xff: Unknown 1691 4) Battery status 1692 0x00: High 1693 0x01: Low 1694 0x02: Critical 1695 0x03: Charging 1696 0x04: Selected battery not present (BIOS >= 1.2 only) 1697 0xff: Unknown 1698 5) Battery flag 1699 bit 0: High 1700 bit 1: Low 1701 bit 2: Critical 1702 bit 3: Charging 1703 bit 7: No system battery 1704 0xff: Unknown 1705 6) Remaining battery life (percentage of charge): 1706 0-100: valid 1707 -1: Unknown 1708 7) Remaining battery life (time units): 1709 Number of remaining minutes or seconds 1710 -1: Unknown 1711 8) min = minutes; sec = seconds */ 1712 1713 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1714 driver_version, 1715 (apm_info.bios.version >> 8) & 0xff, 1716 apm_info.bios.version & 0xff, 1717 apm_info.bios.flags, 1718 ac_line_status, 1719 battery_status, 1720 battery_flag, 1721 percentage, 1722 time_units, 1723 units); 1724 return 0; 1725 } 1726 1727 static int proc_apm_open(struct inode *inode, struct file *file) 1728 { 1729 return single_open(file, proc_apm_show, NULL); 1730 } 1731 1732 static const struct file_operations apm_file_ops = { 1733 .owner = THIS_MODULE, 1734 .open = proc_apm_open, 1735 .read = seq_read, 1736 .llseek = seq_lseek, 1737 .release = single_release, 1738 }; 1739 1740 static int apm(void *unused) 1741 { 1742 unsigned short bx; 1743 unsigned short cx; 1744 unsigned short dx; 1745 int error; 1746 char *power_stat; 1747 char *bat_stat; 1748 1749 /* 2002/08/01 - WT 1750 * This is to avoid random crashes at boot time during initialization 1751 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1752 * Some bioses don't like being called from CPU != 0. 1753 * Method suggested by Ingo Molnar. 1754 */ 1755 set_cpus_allowed_ptr(current, cpumask_of(0)); 1756 BUG_ON(smp_processor_id() != 0); 1757 1758 if (apm_info.connection_version == 0) { 1759 apm_info.connection_version = apm_info.bios.version; 1760 if (apm_info.connection_version > 0x100) { 1761 /* 1762 * We only support BIOSs up to version 1.2 1763 */ 1764 if (apm_info.connection_version > 0x0102) 1765 apm_info.connection_version = 0x0102; 1766 error = apm_driver_version(&apm_info.connection_version); 1767 if (error != APM_SUCCESS) { 1768 apm_error("driver version", error); 1769 /* Fall back to an APM 1.0 connection. */ 1770 apm_info.connection_version = 0x100; 1771 } 1772 } 1773 } 1774 1775 if (debug) 1776 printk(KERN_INFO "apm: Connection version %d.%d\n", 1777 (apm_info.connection_version >> 8) & 0xff, 1778 apm_info.connection_version & 0xff); 1779 1780 #ifdef CONFIG_APM_DO_ENABLE 1781 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1782 /* 1783 * This call causes my NEC UltraLite Versa 33/C to hang if it 1784 * is booted with PM disabled but not in the docking station. 1785 * Unfortunate ... 1786 */ 1787 error = apm_enable_power_management(1); 1788 if (error) { 1789 apm_error("enable power management", error); 1790 return -1; 1791 } 1792 } 1793 #endif 1794 1795 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1796 && (apm_info.connection_version > 0x0100)) { 1797 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1798 if (error) { 1799 apm_error("engage power management", error); 1800 return -1; 1801 } 1802 } 1803 1804 if (debug && (num_online_cpus() == 1 || smp)) { 1805 error = apm_get_power_status(&bx, &cx, &dx); 1806 if (error) 1807 printk(KERN_INFO "apm: power status not available\n"); 1808 else { 1809 switch ((bx >> 8) & 0xff) { 1810 case 0: 1811 power_stat = "off line"; 1812 break; 1813 case 1: 1814 power_stat = "on line"; 1815 break; 1816 case 2: 1817 power_stat = "on backup power"; 1818 break; 1819 default: 1820 power_stat = "unknown"; 1821 break; 1822 } 1823 switch (bx & 0xff) { 1824 case 0: 1825 bat_stat = "high"; 1826 break; 1827 case 1: 1828 bat_stat = "low"; 1829 break; 1830 case 2: 1831 bat_stat = "critical"; 1832 break; 1833 case 3: 1834 bat_stat = "charging"; 1835 break; 1836 default: 1837 bat_stat = "unknown"; 1838 break; 1839 } 1840 printk(KERN_INFO 1841 "apm: AC %s, battery status %s, battery life ", 1842 power_stat, bat_stat); 1843 if ((cx & 0xff) == 0xff) 1844 printk("unknown\n"); 1845 else 1846 printk("%d%%\n", cx & 0xff); 1847 if (apm_info.connection_version > 0x100) { 1848 printk(KERN_INFO 1849 "apm: battery flag 0x%02x, battery life ", 1850 (cx >> 8) & 0xff); 1851 if (dx == 0xffff) 1852 printk("unknown\n"); 1853 else 1854 printk("%d %s\n", dx & 0x7fff, 1855 (dx & 0x8000) ? 1856 "minutes" : "seconds"); 1857 } 1858 } 1859 } 1860 1861 /* Install our power off handler.. */ 1862 if (power_off) 1863 pm_power_off = apm_power_off; 1864 1865 if (num_online_cpus() == 1 || smp) { 1866 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1867 console_blank_hook = apm_console_blank; 1868 #endif 1869 apm_mainloop(); 1870 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1871 console_blank_hook = NULL; 1872 #endif 1873 } 1874 1875 return 0; 1876 } 1877 1878 #ifndef MODULE 1879 static int __init apm_setup(char *str) 1880 { 1881 int invert; 1882 1883 while ((str != NULL) && (*str != '\0')) { 1884 if (strncmp(str, "off", 3) == 0) 1885 apm_disabled = 1; 1886 if (strncmp(str, "on", 2) == 0) 1887 apm_disabled = 0; 1888 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1889 (strncmp(str, "bounce_interval=", 16) == 0)) 1890 bounce_interval = simple_strtol(str + 16, NULL, 0); 1891 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1892 (strncmp(str, "idle_threshold=", 15) == 0)) 1893 idle_threshold = simple_strtol(str + 15, NULL, 0); 1894 if ((strncmp(str, "idle-period=", 12) == 0) || 1895 (strncmp(str, "idle_period=", 12) == 0)) 1896 idle_period = simple_strtol(str + 12, NULL, 0); 1897 invert = (strncmp(str, "no-", 3) == 0) || 1898 (strncmp(str, "no_", 3) == 0); 1899 if (invert) 1900 str += 3; 1901 if (strncmp(str, "debug", 5) == 0) 1902 debug = !invert; 1903 if ((strncmp(str, "power-off", 9) == 0) || 1904 (strncmp(str, "power_off", 9) == 0)) 1905 power_off = !invert; 1906 if (strncmp(str, "smp", 3) == 0) { 1907 smp = !invert; 1908 idle_threshold = 100; 1909 } 1910 if ((strncmp(str, "allow-ints", 10) == 0) || 1911 (strncmp(str, "allow_ints", 10) == 0)) 1912 apm_info.allow_ints = !invert; 1913 if ((strncmp(str, "broken-psr", 10) == 0) || 1914 (strncmp(str, "broken_psr", 10) == 0)) 1915 apm_info.get_power_status_broken = !invert; 1916 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1917 (strncmp(str, "realmode_power_off", 18) == 0)) 1918 apm_info.realmode_power_off = !invert; 1919 str = strchr(str, ','); 1920 if (str != NULL) 1921 str += strspn(str, ", \t"); 1922 } 1923 return 1; 1924 } 1925 1926 __setup("apm=", apm_setup); 1927 #endif 1928 1929 static const struct file_operations apm_bios_fops = { 1930 .owner = THIS_MODULE, 1931 .read = do_read, 1932 .poll = do_poll, 1933 .unlocked_ioctl = do_ioctl, 1934 .open = do_open, 1935 .release = do_release, 1936 .llseek = noop_llseek, 1937 }; 1938 1939 static struct miscdevice apm_device = { 1940 APM_MINOR_DEV, 1941 "apm_bios", 1942 &apm_bios_fops 1943 }; 1944 1945 1946 /* Simple "print if true" callback */ 1947 static int __init print_if_true(const struct dmi_system_id *d) 1948 { 1949 printk("%s\n", d->ident); 1950 return 0; 1951 } 1952 1953 /* 1954 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1955 * disabled before the suspend. Linux used to get terribly confused by that. 1956 */ 1957 static int __init broken_ps2_resume(const struct dmi_system_id *d) 1958 { 1959 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1960 "workaround hopefully not needed.\n", d->ident); 1961 return 0; 1962 } 1963 1964 /* Some bioses have a broken protected mode poweroff and need to use realmode */ 1965 static int __init set_realmode_power_off(const struct dmi_system_id *d) 1966 { 1967 if (apm_info.realmode_power_off == 0) { 1968 apm_info.realmode_power_off = 1; 1969 printk(KERN_INFO "%s bios detected. " 1970 "Using realmode poweroff only.\n", d->ident); 1971 } 1972 return 0; 1973 } 1974 1975 /* Some laptops require interrupts to be enabled during APM calls */ 1976 static int __init set_apm_ints(const struct dmi_system_id *d) 1977 { 1978 if (apm_info.allow_ints == 0) { 1979 apm_info.allow_ints = 1; 1980 printk(KERN_INFO "%s machine detected. " 1981 "Enabling interrupts during APM calls.\n", d->ident); 1982 } 1983 return 0; 1984 } 1985 1986 /* Some APM bioses corrupt memory or just plain do not work */ 1987 static int __init apm_is_horked(const struct dmi_system_id *d) 1988 { 1989 if (apm_info.disabled == 0) { 1990 apm_info.disabled = 1; 1991 printk(KERN_INFO "%s machine detected. " 1992 "Disabling APM.\n", d->ident); 1993 } 1994 return 0; 1995 } 1996 1997 static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1998 { 1999 if (apm_info.disabled == 0) { 2000 apm_info.disabled = 1; 2001 printk(KERN_INFO "%s machine detected. " 2002 "Disabling APM.\n", d->ident); 2003 printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); 2004 printk(KERN_INFO "download from support.intel.com\n"); 2005 } 2006 return 0; 2007 } 2008 2009 /* Some APM bioses hang on APM idle calls */ 2010 static int __init apm_likes_to_melt(const struct dmi_system_id *d) 2011 { 2012 if (apm_info.forbid_idle == 0) { 2013 apm_info.forbid_idle = 1; 2014 printk(KERN_INFO "%s machine detected. " 2015 "Disabling APM idle calls.\n", d->ident); 2016 } 2017 return 0; 2018 } 2019 2020 /* 2021 * Check for clue free BIOS implementations who use 2022 * the following QA technique 2023 * 2024 * [ Write BIOS Code ]<------ 2025 * | ^ 2026 * < Does it Compile >----N-- 2027 * |Y ^ 2028 * < Does it Boot Win98 >-N-- 2029 * |Y 2030 * [Ship It] 2031 * 2032 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 2033 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 2034 */ 2035 static int __init broken_apm_power(const struct dmi_system_id *d) 2036 { 2037 apm_info.get_power_status_broken = 1; 2038 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 2039 "disabling power status reporting.\n"); 2040 return 0; 2041 } 2042 2043 /* 2044 * This bios swaps the APM minute reporting bytes over (Many sony laptops 2045 * have this problem). 2046 */ 2047 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 2048 { 2049 apm_info.get_power_status_swabinminutes = 1; 2050 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 2051 "in minutes and wrong byte order.\n"); 2052 return 0; 2053 } 2054 2055 static struct dmi_system_id __initdata apm_dmi_table[] = { 2056 { 2057 print_if_true, 2058 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2059 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2060 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2061 }, 2062 { /* Handle problems with APM on the C600 */ 2063 broken_ps2_resume, "Dell Latitude C600", 2064 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2065 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2066 }, 2067 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2068 set_apm_ints, "Dell Latitude", 2069 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2070 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2071 }, 2072 { /* APM crashes */ 2073 apm_is_horked, "Dell Inspiron 2500", 2074 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2075 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2076 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2077 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2078 }, 2079 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2080 set_apm_ints, "Dell Inspiron", { 2081 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2082 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2083 }, 2084 { /* Handle problems with APM on Inspiron 5000e */ 2085 broken_apm_power, "Dell Inspiron 5000e", 2086 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2087 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2088 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2089 }, 2090 { /* Handle problems with APM on Inspiron 2500 */ 2091 broken_apm_power, "Dell Inspiron 2500", 2092 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2093 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2094 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2095 }, 2096 { /* APM crashes */ 2097 apm_is_horked, "Dell Dimension 4100", 2098 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2099 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2100 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2101 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2102 }, 2103 { /* Allow interrupts during suspend on Compaq Laptops*/ 2104 set_apm_ints, "Compaq 12XL125", 2105 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2106 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2107 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2108 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2109 }, 2110 { /* Allow interrupts during APM or the clock goes slow */ 2111 set_apm_ints, "ASUSTeK", 2112 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2113 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2114 }, 2115 { /* APM blows on shutdown */ 2116 apm_is_horked, "ABIT KX7-333[R]", 2117 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2118 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2119 }, 2120 { /* APM crashes */ 2121 apm_is_horked, "Trigem Delhi3", 2122 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2123 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2124 }, 2125 { /* APM crashes */ 2126 apm_is_horked, "Fujitsu-Siemens", 2127 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2128 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2129 }, 2130 { /* APM crashes */ 2131 apm_is_horked_d850md, "Intel D850MD", 2132 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2133 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2134 }, 2135 { /* APM crashes */ 2136 apm_is_horked, "Intel D810EMO", 2137 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2138 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2139 }, 2140 { /* APM crashes */ 2141 apm_is_horked, "Dell XPS-Z", 2142 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2143 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2144 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2145 }, 2146 { /* APM crashes */ 2147 apm_is_horked, "Sharp PC-PJ/AX", 2148 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2149 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2150 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2151 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2152 }, 2153 { /* APM crashes */ 2154 apm_is_horked, "Dell Inspiron 2500", 2155 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2156 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2157 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2158 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2159 }, 2160 { /* APM idle hangs */ 2161 apm_likes_to_melt, "Jabil AMD", 2162 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2163 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2164 }, 2165 { /* APM idle hangs */ 2166 apm_likes_to_melt, "AMI Bios", 2167 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2168 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2169 }, 2170 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2171 swab_apm_power_in_minutes, "Sony VAIO", 2172 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2173 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2174 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2175 }, 2176 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2177 swab_apm_power_in_minutes, "Sony VAIO", 2178 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2179 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2180 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2181 }, 2182 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2183 swab_apm_power_in_minutes, "Sony VAIO", 2184 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2185 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2186 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2187 }, 2188 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2189 swab_apm_power_in_minutes, "Sony VAIO", 2190 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2191 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2192 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2193 }, 2194 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2195 swab_apm_power_in_minutes, "Sony VAIO", 2196 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2197 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2198 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2199 }, 2200 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2201 swab_apm_power_in_minutes, "Sony VAIO", 2202 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2203 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2204 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2205 }, 2206 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2207 swab_apm_power_in_minutes, "Sony VAIO", 2208 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2209 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2210 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2211 }, 2212 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2213 swab_apm_power_in_minutes, "Sony VAIO", 2214 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2215 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2216 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2217 }, 2218 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2219 swab_apm_power_in_minutes, "Sony VAIO", 2220 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2221 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2222 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2223 }, 2224 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2225 swab_apm_power_in_minutes, "Sony VAIO", 2226 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2227 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2228 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2229 }, 2230 2231 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2232 swab_apm_power_in_minutes, "Sony VAIO", 2233 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2234 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2235 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2236 }, 2237 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2238 swab_apm_power_in_minutes, "Sony VAIO", 2239 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2240 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2241 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2242 }, 2243 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2244 swab_apm_power_in_minutes, "Sony VAIO", 2245 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2246 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2247 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2248 }, 2249 { /* broken PM poweroff bios */ 2250 set_realmode_power_off, "Award Software v4.60 PGMA", 2251 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2252 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2253 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2254 }, 2255 2256 /* Generic per vendor APM settings */ 2257 2258 { /* Allow interrupts during suspend on IBM laptops */ 2259 set_apm_ints, "IBM", 2260 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2261 }, 2262 2263 { } 2264 }; 2265 2266 /* 2267 * Just start the APM thread. We do NOT want to do APM BIOS 2268 * calls from anything but the APM thread, if for no other reason 2269 * than the fact that we don't trust the APM BIOS. This way, 2270 * most common APM BIOS problems that lead to protection errors 2271 * etc will have at least some level of being contained... 2272 * 2273 * In short, if something bad happens, at least we have a choice 2274 * of just killing the apm thread.. 2275 */ 2276 static int __init apm_init(void) 2277 { 2278 struct desc_struct *gdt; 2279 int err; 2280 2281 dmi_check_system(apm_dmi_table); 2282 2283 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { 2284 printk(KERN_INFO "apm: BIOS not found.\n"); 2285 return -ENODEV; 2286 } 2287 printk(KERN_INFO 2288 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2289 ((apm_info.bios.version >> 8) & 0xff), 2290 (apm_info.bios.version & 0xff), 2291 apm_info.bios.flags, 2292 driver_version); 2293 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2294 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2295 return -ENODEV; 2296 } 2297 2298 if (allow_ints) 2299 apm_info.allow_ints = 1; 2300 if (broken_psr) 2301 apm_info.get_power_status_broken = 1; 2302 if (realmode_power_off) 2303 apm_info.realmode_power_off = 1; 2304 /* User can override, but default is to trust DMI */ 2305 if (apm_disabled != -1) 2306 apm_info.disabled = apm_disabled; 2307 2308 /* 2309 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2310 * but is reportedly a 1.0 BIOS. 2311 */ 2312 if (apm_info.bios.version == 0x001) 2313 apm_info.bios.version = 0x100; 2314 2315 /* BIOS < 1.2 doesn't set cseg_16_len */ 2316 if (apm_info.bios.version < 0x102) 2317 apm_info.bios.cseg_16_len = 0; /* 64k */ 2318 2319 if (debug) { 2320 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2321 apm_info.bios.cseg, apm_info.bios.offset, 2322 apm_info.bios.cseg_16, apm_info.bios.dseg); 2323 if (apm_info.bios.version > 0x100) 2324 printk(" cseg len %x, dseg len %x", 2325 apm_info.bios.cseg_len, 2326 apm_info.bios.dseg_len); 2327 if (apm_info.bios.version > 0x101) 2328 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2329 printk("\n"); 2330 } 2331 2332 if (apm_info.disabled) { 2333 pr_notice("disabled on user request.\n"); 2334 return -ENODEV; 2335 } 2336 if ((num_online_cpus() > 1) && !power_off && !smp) { 2337 pr_notice("disabled - APM is not SMP safe.\n"); 2338 apm_info.disabled = 1; 2339 return -ENODEV; 2340 } 2341 if (!acpi_disabled) { 2342 pr_notice("overridden by ACPI.\n"); 2343 apm_info.disabled = 1; 2344 return -ENODEV; 2345 } 2346 2347 /* 2348 * Set up the long jump entry point to the APM BIOS, which is called 2349 * from inline assembly. 2350 */ 2351 apm_bios_entry.offset = apm_info.bios.offset; 2352 apm_bios_entry.segment = APM_CS; 2353 2354 /* 2355 * The APM 1.1 BIOS is supposed to provide limit information that it 2356 * recognizes. Many machines do this correctly, but many others do 2357 * not restrict themselves to their claimed limit. When this happens, 2358 * they will cause a segmentation violation in the kernel at boot time. 2359 * Most BIOS's, however, will respect a 64k limit, so we use that. 2360 * 2361 * Note we only set APM segments on CPU zero, since we pin the APM 2362 * code to that CPU. 2363 */ 2364 gdt = get_cpu_gdt_table(0); 2365 set_desc_base(&gdt[APM_CS >> 3], 2366 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); 2367 set_desc_base(&gdt[APM_CS_16 >> 3], 2368 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); 2369 set_desc_base(&gdt[APM_DS >> 3], 2370 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); 2371 2372 proc_create("apm", 0, NULL, &apm_file_ops); 2373 2374 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2375 if (IS_ERR(kapmd_task)) { 2376 pr_err("disabled - Unable to start kernel thread\n"); 2377 err = PTR_ERR(kapmd_task); 2378 kapmd_task = NULL; 2379 remove_proc_entry("apm", NULL); 2380 return err; 2381 } 2382 wake_up_process(kapmd_task); 2383 2384 if (num_online_cpus() > 1 && !smp) { 2385 printk(KERN_NOTICE 2386 "apm: disabled - APM is not SMP safe (power off active).\n"); 2387 return 0; 2388 } 2389 2390 /* 2391 * Note we don't actually care if the misc_device cannot be registered. 2392 * this driver can do its job without it, even if userspace can't 2393 * control it. just log the error 2394 */ 2395 if (misc_register(&apm_device)) 2396 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2397 2398 if (HZ != 100) 2399 idle_period = (idle_period * HZ) / 100; 2400 if (idle_threshold < 100) { 2401 if (!cpuidle_register_driver(&apm_idle_driver)) 2402 if (cpuidle_register_device(&apm_cpuidle_device)) 2403 cpuidle_unregister_driver(&apm_idle_driver); 2404 } 2405 2406 return 0; 2407 } 2408 2409 static void __exit apm_exit(void) 2410 { 2411 int error; 2412 2413 cpuidle_unregister_device(&apm_cpuidle_device); 2414 cpuidle_unregister_driver(&apm_idle_driver); 2415 2416 if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) 2417 && (apm_info.connection_version > 0x0100)) { 2418 error = apm_engage_power_management(APM_DEVICE_ALL, 0); 2419 if (error) 2420 apm_error("disengage power management", error); 2421 } 2422 misc_deregister(&apm_device); 2423 remove_proc_entry("apm", NULL); 2424 if (power_off) 2425 pm_power_off = NULL; 2426 if (kapmd_task) { 2427 kthread_stop(kapmd_task); 2428 kapmd_task = NULL; 2429 } 2430 } 2431 2432 module_init(apm_init); 2433 module_exit(apm_exit); 2434 2435 MODULE_AUTHOR("Stephen Rothwell"); 2436 MODULE_DESCRIPTION("Advanced Power Management"); 2437 MODULE_LICENSE("GPL"); 2438 module_param(debug, bool, 0644); 2439 MODULE_PARM_DESC(debug, "Enable debug mode"); 2440 module_param(power_off, bool, 0444); 2441 MODULE_PARM_DESC(power_off, "Enable power off"); 2442 module_param(bounce_interval, int, 0444); 2443 MODULE_PARM_DESC(bounce_interval, 2444 "Set the number of ticks to ignore suspend bounces"); 2445 module_param(allow_ints, bool, 0444); 2446 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2447 module_param(broken_psr, bool, 0444); 2448 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2449 module_param(realmode_power_off, bool, 0444); 2450 MODULE_PARM_DESC(realmode_power_off, 2451 "Switch to real mode before powering off"); 2452 module_param(idle_threshold, int, 0444); 2453 MODULE_PARM_DESC(idle_threshold, 2454 "System idle percentage above which to make APM BIOS idle calls"); 2455 module_param(idle_period, int, 0444); 2456 MODULE_PARM_DESC(idle_period, 2457 "Period (in sec/100) over which to caculate the idle percentage"); 2458 module_param(smp, bool, 0444); 2459 MODULE_PARM_DESC(smp, 2460 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2461 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2462