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