1 /* -*- linux-c -*- 2 * APM BIOS driver for Linux 3 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au) 4 * 5 * Initial development of this driver was funded by NEC Australia P/L 6 * and NEC Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2, or (at your option) any 11 * later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * October 1995, Rik Faith (faith@cs.unc.edu): 19 * Minor enhancements and updates (to the patch set) for 1.3.x 20 * Documentation 21 * January 1996, Rik Faith (faith@cs.unc.edu): 22 * Make /proc/apm easy to format (bump driver version) 23 * March 1996, Rik Faith (faith@cs.unc.edu): 24 * Prohibit APM BIOS calls unless apm_enabled. 25 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>) 26 * April 1996, Stephen Rothwell (sfr@canb.auug.org.au) 27 * Version 1.0 and 1.1 28 * May 1996, Version 1.2 29 * Feb 1998, Version 1.3 30 * Feb 1998, Version 1.4 31 * Aug 1998, Version 1.5 32 * Sep 1998, Version 1.6 33 * Nov 1998, Version 1.7 34 * Jan 1999, Version 1.8 35 * Jan 1999, Version 1.9 36 * Oct 1999, Version 1.10 37 * Nov 1999, Version 1.11 38 * Jan 2000, Version 1.12 39 * Feb 2000, Version 1.13 40 * Nov 2000, Version 1.14 41 * Oct 2001, Version 1.15 42 * Jan 2002, Version 1.16 43 * Oct 2002, Version 1.16ac 44 * 45 * History: 46 * 0.6b: first version in official kernel, Linux 1.3.46 47 * 0.7: changed /proc/apm format, Linux 1.3.58 48 * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59 49 * 0.9: only call bios if bios is present, Linux 1.3.72 50 * 1.0: use fixed device number, consolidate /proc/apm into this file, 51 * Linux 1.3.85 52 * 1.1: support user-space standby and suspend, power off after system 53 * halted, Linux 1.3.98 54 * 1.2: When resetting RTC after resume, take care so that the time 55 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth 56 * <jtoth@princeton.edu>); improve interaction between 57 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4 58 * 1.2a:Simple change to stop mysterious bug reports with SMP also added 59 * levels to the printk calls. APM is not defined for SMP machines. 60 * The new replacement for it is, but Linux doesn't yet support this. 61 * Alan Cox Linux 2.1.55 62 * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's 63 * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by 64 * Dean Gaudet <dgaudet@arctic.org>. 65 * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87 66 * 1.5: Fix segment register reloading (in case of bad segments saved 67 * across BIOS call). 68 * Stephen Rothwell 69 * 1.6: Cope with complier/assembler differences. 70 * Only try to turn off the first display device. 71 * Fix OOPS at power off with no APM BIOS by Jan Echternach 72 * <echter@informatik.uni-rostock.de> 73 * Stephen Rothwell 74 * 1.7: Modify driver's cached copy of the disabled/disengaged flags 75 * to reflect current state of APM BIOS. 76 * Chris Rankin <rankinc@bellsouth.net> 77 * Reset interrupt 0 timer to 100Hz after suspend 78 * Chad Miller <cmiller@surfsouth.com> 79 * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE 80 * Richard Gooch <rgooch@atnf.csiro.au> 81 * Allow boot time disabling of APM 82 * Make boot messages far less verbose by default 83 * Make asm safer 84 * Stephen Rothwell 85 * 1.8: Add CONFIG_APM_RTC_IS_GMT 86 * Richard Gooch <rgooch@atnf.csiro.au> 87 * change APM_NOINTS to CONFIG_APM_ALLOW_INTS 88 * remove dependency on CONFIG_PROC_FS 89 * Stephen Rothwell 90 * 1.9: Fix small typo. <laslo@wodip.opole.pl> 91 * Try to cope with BIOS's that need to have all display 92 * devices blanked and not just the first one. 93 * Ross Paterson <ross@soi.city.ac.uk> 94 * Fix segment limit setting it has always been wrong as 95 * the segments needed to have byte granularity. 96 * Mark a few things __init. 97 * Add hack to allow power off of SMP systems by popular request. 98 * Use CONFIG_SMP instead of __SMP__ 99 * Ignore BOUNCES for three seconds. 100 * Stephen Rothwell 101 * 1.10: Fix for Thinkpad return code. 102 * Merge 2.2 and 2.3 drivers. 103 * Remove APM dependencies in arch/i386/kernel/process.c 104 * Remove APM dependencies in drivers/char/sysrq.c 105 * Reset time across standby. 106 * Allow more inititialisation on SMP. 107 * Remove CONFIG_APM_POWER_OFF and make it boot time 108 * configurable (default on). 109 * Make debug only a boot time parameter (remove APM_DEBUG). 110 * Try to blank all devices on any error. 111 * 1.11: Remove APM dependencies in drivers/char/console.c 112 * Check nr_running to detect if we are idle (from 113 * Borislav Deianov <borislav@lix.polytechnique.fr>) 114 * Fix for bioses that don't zero the top part of the 115 * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>) 116 * (reported by Panos Katsaloulis <teras@writeme.com>). 117 * Real mode power off patch (Walter Hofmann 118 * <Walter.Hofmann@physik.stud.uni-erlangen.de>). 119 * 1.12: Remove CONFIG_SMP as the compiler will optimize 120 * the code away anyway (smp_num_cpus == 1 in UP) 121 * noted by Artur Skawina <skawina@geocities.com>. 122 * Make power off under SMP work again. 123 * Fix thinko with initial engaging of BIOS. 124 * Make sure power off only happens on CPU 0 125 * (Paul "Rusty" Russell <rusty@rustcorp.com.au>). 126 * Do error notification to user mode if BIOS calls fail. 127 * Move entrypoint offset fix to ...boot/setup.S 128 * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>). 129 * Remove smp-power-off. SMP users must now specify 130 * "apm=power-off" on the kernel command line. Suggested 131 * by Jim Avera <jima@hal.com>, modified by Alan Cox 132 * <alan@lxorguk.ukuu.org.uk>. 133 * Register the /proc/apm entry even on SMP so that 134 * scripts that check for it before doing power off 135 * work (Jim Avera <jima@hal.com>). 136 * 1.13: Changes for new pm_ interfaces (Andy Henroid 137 * <andy_henroid@yahoo.com>). 138 * Modularize the code. 139 * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS 140 * is now the way life works). 141 * Fix thinko in suspend() (wrong return). 142 * Notify drivers on critical suspend. 143 * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz> 144 * modified by sfr). 145 * Disable interrupts while we are suspended (Andy Henroid 146 * <andy_henroid@yahoo.com> fixed by sfr). 147 * Make power off work on SMP again (Tony Hoyle 148 * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr. 149 * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore 150 * interval is now configurable. 151 * 1.14: Make connection version persist across module unload/load. 152 * Enable and engage power management earlier. 153 * Disengage power management on module unload. 154 * Changed to use the sysrq-register hack for registering the 155 * power off function called by magic sysrq based upon discussions 156 * in irc://irc.openprojects.net/#kernelnewbies 157 * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>). 158 * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable. 159 * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr. 160 * Work around byte swap bug in one of the Vaio's BIOS's 161 * (Marc Boucher <marc@mbsi.ca>). 162 * Exposed the disable flag to dmi so that we can handle known 163 * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). 164 * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin 165 * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) 166 * If an APM idle fails log it and idle sensibly 167 * 1.15: Don't queue events to clients who open the device O_WRONLY. 168 * Don't expect replies from clients who open the device O_RDONLY. 169 * (Idea from Thomas Hood) 170 * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>) 171 * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.) 172 * Notify listeners of standby or suspend events before notifying 173 * drivers. Return EBUSY to ioctl() if suspend is rejected. 174 * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood) 175 * Ignore first resume after we generate our own resume event 176 * after a suspend (Thomas Hood) 177 * Daemonize now gets rid of our controlling terminal (sfr). 178 * CONFIG_APM_CPU_IDLE now just affects the default value of 179 * idle_threshold (sfr). 180 * Change name of kernel apm daemon (as it no longer idles) (sfr). 181 * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we 182 * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. 183 * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. 184 * 185 * APM 1.1 Reference: 186 * 187 * Intel Corporation, Microsoft Corporation. Advanced Power Management 188 * (APM) BIOS Interface Specification, Revision 1.1, September 1993. 189 * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01. 190 * 191 * [This document is available free from Intel by calling 800.628.8686 (fax 192 * 916.356.6100) or 800.548.4725; or via anonymous ftp from 193 * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also 194 * available from Microsoft by calling 206.882.8080.] 195 * 196 * APM 1.2 Reference: 197 * Intel Corporation, Microsoft Corporation. Advanced Power Management 198 * (APM) BIOS Interface Specification, Revision 1.2, February 1996. 199 * 200 * [This document is available from Microsoft at: 201 * http://www.microsoft.com/whdc/archive/amp_12.mspx] 202 */ 203 204 #include <linux/module.h> 205 206 #include <linux/poll.h> 207 #include <linux/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> 230 231 #include <asm/system.h> 232 #include <asm/uaccess.h> 233 #include <asm/desc.h> 234 #include <asm/i8253.h> 235 #include <asm/olpc.h> 236 #include <asm/paravirt.h> 237 #include <asm/reboot.h> 238 239 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 240 extern int (*console_blank_hook)(int); 241 #endif 242 243 /* 244 * The apm_bios device is one of the misc char devices. 245 * This is its minor number. 246 */ 247 #define APM_MINOR_DEV 134 248 249 /* 250 * See Documentation/Config.help for the configuration options. 251 * 252 * Various options can be changed at boot time as follows: 253 * (We allow underscores for compatibility with the modules code) 254 * apm=on/off enable/disable APM 255 * [no-]allow[-_]ints allow interrupts during BIOS calls 256 * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call 257 * [no-]realmode[-_]power[-_]off switch to real mode before 258 * powering off 259 * [no-]debug log some debugging messages 260 * [no-]power[-_]off power off on shutdown 261 * [no-]smp Use apm even on an SMP box 262 * bounce[-_]interval=<n> number of ticks to ignore suspend 263 * bounces 264 * idle[-_]threshold=<n> System idle percentage above which to 265 * make APM BIOS idle calls. Set it to 266 * 100 to disable. 267 * idle[-_]period=<n> Period (in 1/100s of a second) over 268 * which the idle percentage is 269 * calculated. 270 */ 271 272 /* KNOWN PROBLEM MACHINES: 273 * 274 * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant 275 * [Confirmed by TI representative] 276 * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification 277 * [Confirmed by BIOS disassembly] 278 * [This may work now ...] 279 * P: Toshiba 1950S: battery life information only gets updated after resume 280 * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking 281 * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] 282 * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP 283 * Neale Banks <neale@lowendale.com.au> December 2000 284 * 285 * Legend: U = unusable with APM patches 286 * P = partially usable with APM patches 287 */ 288 289 /* 290 * Define as 1 to make the driver always call the APM BIOS busy 291 * routine even if the clock was not reported as slowed by the 292 * idle routine. Otherwise, define as 0. 293 */ 294 #define ALWAYS_CALL_BUSY 1 295 296 /* 297 * Define to make the APM BIOS calls zero all data segment registers (so 298 * that an incorrect BIOS implementation will cause a kernel panic if it 299 * tries to write to arbitrary memory). 300 */ 301 #define APM_ZERO_SEGS 302 303 #include <asm/apm.h> 304 305 /* 306 * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. 307 * This patched by Chad Miller <cmiller@surfsouth.com>, original code by 308 * David Chen <chen@ctpa04.mit.edu> 309 */ 310 #undef INIT_TIMER_AFTER_SUSPEND 311 312 #ifdef INIT_TIMER_AFTER_SUSPEND 313 #include <linux/timex.h> 314 #include <asm/io.h> 315 #include <linux/delay.h> 316 #endif 317 318 /* 319 * Need to poll the APM BIOS every second 320 */ 321 #define APM_CHECK_TIMEOUT (HZ) 322 323 /* 324 * Ignore suspend events for this amount of time after a resume 325 */ 326 #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) 327 328 /* 329 * Maximum number of events stored 330 */ 331 #define APM_MAX_EVENTS 20 332 333 /* 334 * The per-file APM data 335 */ 336 struct apm_user { 337 int magic; 338 struct apm_user *next; 339 unsigned int suser: 1; 340 unsigned int writer: 1; 341 unsigned int reader: 1; 342 unsigned int suspend_wait: 1; 343 int suspend_result; 344 int suspends_pending; 345 int standbys_pending; 346 int suspends_read; 347 int standbys_read; 348 int event_head; 349 int event_tail; 350 apm_event_t events[APM_MAX_EVENTS]; 351 }; 352 353 /* 354 * The magic number in apm_user 355 */ 356 #define APM_BIOS_MAGIC 0x4101 357 358 /* 359 * idle percentage above which bios idle calls are done 360 */ 361 #ifdef CONFIG_APM_CPU_IDLE 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 int debug __read_mostly; 386 static int smp __read_mostly; 387 static int apm_disabled = -1; 388 #ifdef CONFIG_SMP 389 static int power_off; 390 #else 391 static int power_off = 1; 392 #endif 393 static int realmode_power_off; 394 #ifdef CONFIG_APM_ALLOW_INTS 395 static int allow_ints = 1; 396 #else 397 static int allow_ints; 398 #endif 399 static int 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 recalc: 906 if (jiffies_since_last_check > IDLE_CALC_LIMIT) { 907 use_apm_idle = 0; 908 last_jiffies = jiffies; 909 last_stime = current->stime; 910 } else if (jiffies_since_last_check > idle_period) { 911 unsigned int idle_percentage; 912 913 idle_percentage = current->stime - last_stime; 914 idle_percentage *= 100; 915 idle_percentage /= jiffies_since_last_check; 916 use_apm_idle = (idle_percentage > idle_threshold); 917 if (apm_info.forbid_idle) 918 use_apm_idle = 0; 919 last_jiffies = jiffies; 920 last_stime = current->stime; 921 } 922 923 bucket = IDLE_LEAKY_MAX; 924 925 while (!need_resched()) { 926 if (use_apm_idle) { 927 unsigned int t; 928 929 t = jiffies; 930 switch (apm_do_idle()) { 931 case 0: 932 apm_idle_done = 1; 933 if (t != jiffies) { 934 if (bucket) { 935 bucket = IDLE_LEAKY_MAX; 936 continue; 937 } 938 } else if (bucket) { 939 bucket--; 940 continue; 941 } 942 break; 943 case 1: 944 apm_idle_done = 1; 945 break; 946 default: /* BIOS refused */ 947 break; 948 } 949 } 950 if (original_pm_idle) 951 original_pm_idle(); 952 else 953 default_idle(); 954 local_irq_disable(); 955 jiffies_since_last_check = jiffies - last_jiffies; 956 if (jiffies_since_last_check > idle_period) 957 goto recalc; 958 } 959 960 if (apm_idle_done) 961 apm_do_busy(); 962 963 local_irq_enable(); 964 } 965 966 /** 967 * apm_power_off - ask the BIOS to power off 968 * 969 * Handle the power off sequence. This is the one piece of code we 970 * will execute even on SMP machines. In order to deal with BIOS 971 * bugs we support real mode APM BIOS power off calls. We also make 972 * the SMP call on CPU0 as some systems will only honour this call 973 * on their first cpu. 974 */ 975 976 static void apm_power_off(void) 977 { 978 unsigned char po_bios_call[] = { 979 0xb8, 0x00, 0x10, /* movw $0x1000,ax */ 980 0x8e, 0xd0, /* movw ax,ss */ 981 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */ 982 0xb8, 0x07, 0x53, /* movw $0x5307,ax */ 983 0xbb, 0x01, 0x00, /* movw $0x0001,bx */ 984 0xb9, 0x03, 0x00, /* movw $0x0003,cx */ 985 0xcd, 0x15 /* int $0x15 */ 986 }; 987 988 /* Some bioses don't like being called from CPU != 0 */ 989 if (apm_info.realmode_power_off) { 990 set_cpus_allowed_ptr(current, cpumask_of(0)); 991 machine_real_restart(po_bios_call, sizeof(po_bios_call)); 992 } else { 993 (void)set_system_power_state(APM_STATE_OFF); 994 } 995 } 996 997 #ifdef CONFIG_APM_DO_ENABLE 998 999 /** 1000 * apm_enable_power_management - enable BIOS APM power management 1001 * @enable: enable yes/no 1002 * 1003 * Enable or disable the APM BIOS power services. 1004 */ 1005 1006 static int apm_enable_power_management(int enable) 1007 { 1008 u32 eax; 1009 int err; 1010 1011 if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) 1012 return APM_NOT_ENGAGED; 1013 if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, 1014 enable, &eax, &err)) 1015 return err; 1016 if (enable) 1017 apm_info.bios.flags &= ~APM_BIOS_DISABLED; 1018 else 1019 apm_info.bios.flags |= APM_BIOS_DISABLED; 1020 return APM_SUCCESS; 1021 } 1022 #endif 1023 1024 /** 1025 * apm_get_power_status - get current power state 1026 * @status: returned status 1027 * @bat: battery info 1028 * @life: estimated life 1029 * 1030 * Obtain the current power status from the APM BIOS. We return a 1031 * status which gives the rough battery status, and current power 1032 * source. The bat value returned give an estimate as a percentage 1033 * of life and a status value for the battery. The estimated life 1034 * if reported is a lifetime in secodnds/minutes at current powwer 1035 * consumption. 1036 */ 1037 1038 static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) 1039 { 1040 struct apm_bios_call call; 1041 1042 call.func = APM_FUNC_GET_STATUS; 1043 call.ebx = APM_DEVICE_ALL; 1044 call.ecx = 0; 1045 1046 if (apm_info.get_power_status_broken) 1047 return APM_32_UNSUPPORTED; 1048 if (apm_bios_call(&call)) 1049 return call.err; 1050 *status = call.ebx; 1051 *bat = call.ecx; 1052 if (apm_info.get_power_status_swabinminutes) { 1053 *life = swab16((u16)call.edx); 1054 *life |= 0x8000; 1055 } else 1056 *life = call.edx; 1057 return APM_SUCCESS; 1058 } 1059 1060 #if 0 1061 static int apm_get_battery_status(u_short which, u_short *status, 1062 u_short *bat, u_short *life, u_short *nbat) 1063 { 1064 u32 eax; 1065 u32 ebx; 1066 u32 ecx; 1067 u32 edx; 1068 u32 esi; 1069 1070 if (apm_info.connection_version < 0x0102) { 1071 /* pretend we only have one battery. */ 1072 if (which != 1) 1073 return APM_BAD_DEVICE; 1074 *nbat = 1; 1075 return apm_get_power_status(status, bat, life); 1076 } 1077 1078 if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, 1079 &ebx, &ecx, &edx, &esi)) 1080 return (eax >> 8) & 0xff; 1081 *status = ebx; 1082 *bat = ecx; 1083 *life = edx; 1084 *nbat = esi; 1085 return APM_SUCCESS; 1086 } 1087 #endif 1088 1089 /** 1090 * apm_engage_power_management - enable PM on a device 1091 * @device: identity of device 1092 * @enable: on/off 1093 * 1094 * Activate or deactive power management on either a specific device 1095 * or the entire system (%APM_DEVICE_ALL). 1096 */ 1097 1098 static int apm_engage_power_management(u_short device, int enable) 1099 { 1100 u32 eax; 1101 int err; 1102 1103 if ((enable == 0) && (device == APM_DEVICE_ALL) 1104 && (apm_info.bios.flags & APM_BIOS_DISABLED)) 1105 return APM_DISABLED; 1106 if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, 1107 &eax, &err)) 1108 return err; 1109 if (device == APM_DEVICE_ALL) { 1110 if (enable) 1111 apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; 1112 else 1113 apm_info.bios.flags |= APM_BIOS_DISENGAGED; 1114 } 1115 return APM_SUCCESS; 1116 } 1117 1118 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1119 1120 /** 1121 * apm_console_blank - blank the display 1122 * @blank: on/off 1123 * 1124 * Attempt to blank the console, firstly by blanking just video device 1125 * zero, and if that fails (some BIOSes don't support it) then it blanks 1126 * all video devices. Typically the BIOS will do laptop backlight and 1127 * monitor powerdown for us. 1128 */ 1129 1130 static int apm_console_blank(int blank) 1131 { 1132 int error = APM_NOT_ENGAGED; /* silence gcc */ 1133 int i; 1134 u_short state; 1135 static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; 1136 1137 state = blank ? APM_STATE_STANDBY : APM_STATE_READY; 1138 1139 for (i = 0; i < ARRAY_SIZE(dev); i++) { 1140 error = set_power_state(dev[i], state); 1141 1142 if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) 1143 return 1; 1144 1145 if (error == APM_NOT_ENGAGED) 1146 break; 1147 } 1148 1149 if (error == APM_NOT_ENGAGED) { 1150 static int tried; 1151 int eng_error; 1152 if (tried++ == 0) { 1153 eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1154 if (eng_error) { 1155 apm_error("set display", error); 1156 apm_error("engage interface", eng_error); 1157 return 0; 1158 } else 1159 return apm_console_blank(blank); 1160 } 1161 } 1162 apm_error("set display", error); 1163 return 0; 1164 } 1165 #endif 1166 1167 static int queue_empty(struct apm_user *as) 1168 { 1169 return as->event_head == as->event_tail; 1170 } 1171 1172 static apm_event_t get_queued_event(struct apm_user *as) 1173 { 1174 if (++as->event_tail >= APM_MAX_EVENTS) 1175 as->event_tail = 0; 1176 return as->events[as->event_tail]; 1177 } 1178 1179 static void queue_event(apm_event_t event, struct apm_user *sender) 1180 { 1181 struct apm_user *as; 1182 1183 spin_lock(&user_list_lock); 1184 if (user_list == NULL) 1185 goto out; 1186 for (as = user_list; as != NULL; as = as->next) { 1187 if ((as == sender) || (!as->reader)) 1188 continue; 1189 if (++as->event_head >= APM_MAX_EVENTS) 1190 as->event_head = 0; 1191 1192 if (as->event_head == as->event_tail) { 1193 static int notified; 1194 1195 if (notified++ == 0) 1196 printk(KERN_ERR "apm: an event queue overflowed\n"); 1197 if (++as->event_tail >= APM_MAX_EVENTS) 1198 as->event_tail = 0; 1199 } 1200 as->events[as->event_head] = event; 1201 if (!as->suser || !as->writer) 1202 continue; 1203 switch (event) { 1204 case APM_SYS_SUSPEND: 1205 case APM_USER_SUSPEND: 1206 as->suspends_pending++; 1207 suspends_pending++; 1208 break; 1209 1210 case APM_SYS_STANDBY: 1211 case APM_USER_STANDBY: 1212 as->standbys_pending++; 1213 standbys_pending++; 1214 break; 1215 } 1216 } 1217 wake_up_interruptible(&apm_waitqueue); 1218 out: 1219 spin_unlock(&user_list_lock); 1220 } 1221 1222 static void reinit_timer(void) 1223 { 1224 #ifdef INIT_TIMER_AFTER_SUSPEND 1225 unsigned long flags; 1226 1227 spin_lock_irqsave(&i8253_lock, flags); 1228 /* set the clock to HZ */ 1229 outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 1230 udelay(10); 1231 outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */ 1232 udelay(10); 1233 outb_pit(LATCH >> 8, PIT_CH0); /* MSB */ 1234 udelay(10); 1235 spin_unlock_irqrestore(&i8253_lock, flags); 1236 #endif 1237 } 1238 1239 static int suspend(int vetoable) 1240 { 1241 int err; 1242 struct apm_user *as; 1243 1244 dpm_suspend_start(PMSG_SUSPEND); 1245 1246 dpm_suspend_noirq(PMSG_SUSPEND); 1247 1248 local_irq_disable(); 1249 sysdev_suspend(PMSG_SUSPEND); 1250 1251 local_irq_enable(); 1252 1253 save_processor_state(); 1254 err = set_system_power_state(APM_STATE_SUSPEND); 1255 ignore_normal_resume = 1; 1256 restore_processor_state(); 1257 1258 local_irq_disable(); 1259 reinit_timer(); 1260 1261 if (err == APM_NO_ERROR) 1262 err = APM_SUCCESS; 1263 if (err != APM_SUCCESS) 1264 apm_error("suspend", err); 1265 err = (err == APM_SUCCESS) ? 0 : -EIO; 1266 1267 sysdev_resume(); 1268 local_irq_enable(); 1269 1270 dpm_resume_noirq(PMSG_RESUME); 1271 1272 dpm_resume_end(PMSG_RESUME); 1273 queue_event(APM_NORMAL_RESUME, NULL); 1274 spin_lock(&user_list_lock); 1275 for (as = user_list; as != NULL; as = as->next) { 1276 as->suspend_wait = 0; 1277 as->suspend_result = err; 1278 } 1279 spin_unlock(&user_list_lock); 1280 wake_up_interruptible(&apm_suspend_waitqueue); 1281 return err; 1282 } 1283 1284 static void standby(void) 1285 { 1286 int err; 1287 1288 dpm_suspend_noirq(PMSG_SUSPEND); 1289 1290 local_irq_disable(); 1291 sysdev_suspend(PMSG_SUSPEND); 1292 local_irq_enable(); 1293 1294 err = set_system_power_state(APM_STATE_STANDBY); 1295 if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) 1296 apm_error("standby", err); 1297 1298 local_irq_disable(); 1299 sysdev_resume(); 1300 local_irq_enable(); 1301 1302 dpm_resume_noirq(PMSG_RESUME); 1303 } 1304 1305 static apm_event_t get_event(void) 1306 { 1307 int error; 1308 apm_event_t event = APM_NO_EVENTS; /* silence gcc */ 1309 apm_eventinfo_t info; 1310 1311 static int notified; 1312 1313 /* we don't use the eventinfo */ 1314 error = apm_get_event(&event, &info); 1315 if (error == APM_SUCCESS) 1316 return event; 1317 1318 if ((error != APM_NO_EVENTS) && (notified++ == 0)) 1319 apm_error("get_event", error); 1320 1321 return 0; 1322 } 1323 1324 static void check_events(void) 1325 { 1326 apm_event_t event; 1327 static unsigned long last_resume; 1328 static int ignore_bounce; 1329 1330 while ((event = get_event()) != 0) { 1331 if (debug) { 1332 if (event <= NR_APM_EVENT_NAME) 1333 printk(KERN_DEBUG "apm: received %s notify\n", 1334 apm_event_name[event - 1]); 1335 else 1336 printk(KERN_DEBUG "apm: received unknown " 1337 "event 0x%02x\n", event); 1338 } 1339 if (ignore_bounce 1340 && (time_after(jiffies, last_resume + bounce_interval))) 1341 ignore_bounce = 0; 1342 1343 switch (event) { 1344 case APM_SYS_STANDBY: 1345 case APM_USER_STANDBY: 1346 queue_event(event, NULL); 1347 if (standbys_pending <= 0) 1348 standby(); 1349 break; 1350 1351 case APM_USER_SUSPEND: 1352 #ifdef CONFIG_APM_IGNORE_USER_SUSPEND 1353 if (apm_info.connection_version > 0x100) 1354 set_system_power_state(APM_STATE_REJECT); 1355 break; 1356 #endif 1357 case APM_SYS_SUSPEND: 1358 if (ignore_bounce) { 1359 if (apm_info.connection_version > 0x100) 1360 set_system_power_state(APM_STATE_REJECT); 1361 break; 1362 } 1363 /* 1364 * If we are already processing a SUSPEND, 1365 * then further SUSPEND events from the BIOS 1366 * will be ignored. We also return here to 1367 * cope with the fact that the Thinkpads keep 1368 * sending a SUSPEND event until something else 1369 * happens! 1370 */ 1371 if (ignore_sys_suspend) 1372 return; 1373 ignore_sys_suspend = 1; 1374 queue_event(event, NULL); 1375 if (suspends_pending <= 0) 1376 (void) suspend(1); 1377 break; 1378 1379 case APM_NORMAL_RESUME: 1380 case APM_CRITICAL_RESUME: 1381 case APM_STANDBY_RESUME: 1382 ignore_sys_suspend = 0; 1383 last_resume = jiffies; 1384 ignore_bounce = 1; 1385 if ((event != APM_NORMAL_RESUME) 1386 || (ignore_normal_resume == 0)) { 1387 dpm_resume_end(PMSG_RESUME); 1388 queue_event(event, NULL); 1389 } 1390 ignore_normal_resume = 0; 1391 break; 1392 1393 case APM_CAPABILITY_CHANGE: 1394 case APM_LOW_BATTERY: 1395 case APM_POWER_STATUS_CHANGE: 1396 queue_event(event, NULL); 1397 /* If needed, notify drivers here */ 1398 break; 1399 1400 case APM_UPDATE_TIME: 1401 break; 1402 1403 case APM_CRITICAL_SUSPEND: 1404 /* 1405 * We are not allowed to reject a critical suspend. 1406 */ 1407 (void)suspend(0); 1408 break; 1409 } 1410 } 1411 } 1412 1413 static void apm_event_handler(void) 1414 { 1415 static int pending_count = 4; 1416 int err; 1417 1418 if ((standbys_pending > 0) || (suspends_pending > 0)) { 1419 if ((apm_info.connection_version > 0x100) && 1420 (pending_count-- <= 0)) { 1421 pending_count = 4; 1422 if (debug) 1423 printk(KERN_DEBUG "apm: setting state busy\n"); 1424 err = set_system_power_state(APM_STATE_BUSY); 1425 if (err) 1426 apm_error("busy", err); 1427 } 1428 } else 1429 pending_count = 4; 1430 check_events(); 1431 } 1432 1433 /* 1434 * This is the APM thread main loop. 1435 */ 1436 1437 static void apm_mainloop(void) 1438 { 1439 DECLARE_WAITQUEUE(wait, current); 1440 1441 add_wait_queue(&apm_waitqueue, &wait); 1442 set_current_state(TASK_INTERRUPTIBLE); 1443 for (;;) { 1444 schedule_timeout(APM_CHECK_TIMEOUT); 1445 if (kthread_should_stop()) 1446 break; 1447 /* 1448 * Ok, check all events, check for idle (and mark us sleeping 1449 * so as not to count towards the load average).. 1450 */ 1451 set_current_state(TASK_INTERRUPTIBLE); 1452 apm_event_handler(); 1453 } 1454 remove_wait_queue(&apm_waitqueue, &wait); 1455 } 1456 1457 static int check_apm_user(struct apm_user *as, const char *func) 1458 { 1459 if (as == NULL || as->magic != APM_BIOS_MAGIC) { 1460 printk(KERN_ERR "apm: %s passed bad filp\n", func); 1461 return 1; 1462 } 1463 return 0; 1464 } 1465 1466 static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) 1467 { 1468 struct apm_user *as; 1469 int i; 1470 apm_event_t event; 1471 1472 as = fp->private_data; 1473 if (check_apm_user(as, "read")) 1474 return -EIO; 1475 if ((int)count < sizeof(apm_event_t)) 1476 return -EINVAL; 1477 if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) 1478 return -EAGAIN; 1479 wait_event_interruptible(apm_waitqueue, !queue_empty(as)); 1480 i = count; 1481 while ((i >= sizeof(event)) && !queue_empty(as)) { 1482 event = get_queued_event(as); 1483 if (copy_to_user(buf, &event, sizeof(event))) { 1484 if (i < count) 1485 break; 1486 return -EFAULT; 1487 } 1488 switch (event) { 1489 case APM_SYS_SUSPEND: 1490 case APM_USER_SUSPEND: 1491 as->suspends_read++; 1492 break; 1493 1494 case APM_SYS_STANDBY: 1495 case APM_USER_STANDBY: 1496 as->standbys_read++; 1497 break; 1498 } 1499 buf += sizeof(event); 1500 i -= sizeof(event); 1501 } 1502 if (i < count) 1503 return count - i; 1504 if (signal_pending(current)) 1505 return -ERESTARTSYS; 1506 return 0; 1507 } 1508 1509 static unsigned int do_poll(struct file *fp, poll_table *wait) 1510 { 1511 struct apm_user *as; 1512 1513 as = fp->private_data; 1514 if (check_apm_user(as, "poll")) 1515 return 0; 1516 poll_wait(fp, &apm_waitqueue, wait); 1517 if (!queue_empty(as)) 1518 return POLLIN | POLLRDNORM; 1519 return 0; 1520 } 1521 1522 static long do_ioctl(struct file *filp, u_int cmd, u_long arg) 1523 { 1524 struct apm_user *as; 1525 int ret; 1526 1527 as = filp->private_data; 1528 if (check_apm_user(as, "ioctl")) 1529 return -EIO; 1530 if (!as->suser || !as->writer) 1531 return -EPERM; 1532 switch (cmd) { 1533 case APM_IOC_STANDBY: 1534 mutex_lock(&apm_mutex); 1535 if (as->standbys_read > 0) { 1536 as->standbys_read--; 1537 as->standbys_pending--; 1538 standbys_pending--; 1539 } else 1540 queue_event(APM_USER_STANDBY, as); 1541 if (standbys_pending <= 0) 1542 standby(); 1543 mutex_unlock(&apm_mutex); 1544 break; 1545 case APM_IOC_SUSPEND: 1546 mutex_lock(&apm_mutex); 1547 if (as->suspends_read > 0) { 1548 as->suspends_read--; 1549 as->suspends_pending--; 1550 suspends_pending--; 1551 } else 1552 queue_event(APM_USER_SUSPEND, as); 1553 if (suspends_pending <= 0) { 1554 ret = suspend(1); 1555 mutex_unlock(&apm_mutex); 1556 } else { 1557 as->suspend_wait = 1; 1558 mutex_unlock(&apm_mutex); 1559 wait_event_interruptible(apm_suspend_waitqueue, 1560 as->suspend_wait == 0); 1561 ret = as->suspend_result; 1562 } 1563 return ret; 1564 default: 1565 return -ENOTTY; 1566 } 1567 return 0; 1568 } 1569 1570 static int do_release(struct inode *inode, struct file *filp) 1571 { 1572 struct apm_user *as; 1573 1574 as = filp->private_data; 1575 if (check_apm_user(as, "release")) 1576 return 0; 1577 filp->private_data = NULL; 1578 if (as->standbys_pending > 0) { 1579 standbys_pending -= as->standbys_pending; 1580 if (standbys_pending <= 0) 1581 standby(); 1582 } 1583 if (as->suspends_pending > 0) { 1584 suspends_pending -= as->suspends_pending; 1585 if (suspends_pending <= 0) 1586 (void) suspend(1); 1587 } 1588 spin_lock(&user_list_lock); 1589 if (user_list == as) 1590 user_list = as->next; 1591 else { 1592 struct apm_user *as1; 1593 1594 for (as1 = user_list; 1595 (as1 != NULL) && (as1->next != as); 1596 as1 = as1->next) 1597 ; 1598 if (as1 == NULL) 1599 printk(KERN_ERR "apm: filp not in user list\n"); 1600 else 1601 as1->next = as->next; 1602 } 1603 spin_unlock(&user_list_lock); 1604 kfree(as); 1605 return 0; 1606 } 1607 1608 static int do_open(struct inode *inode, struct file *filp) 1609 { 1610 struct apm_user *as; 1611 1612 as = kmalloc(sizeof(*as), GFP_KERNEL); 1613 if (as == NULL) { 1614 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", 1615 sizeof(*as)); 1616 return -ENOMEM; 1617 } 1618 as->magic = APM_BIOS_MAGIC; 1619 as->event_tail = as->event_head = 0; 1620 as->suspends_pending = as->standbys_pending = 0; 1621 as->suspends_read = as->standbys_read = 0; 1622 /* 1623 * XXX - this is a tiny bit broken, when we consider BSD 1624 * process accounting. If the device is opened by root, we 1625 * instantly flag that we used superuser privs. Who knows, 1626 * we might close the device immediately without doing a 1627 * privileged operation -- cevans 1628 */ 1629 as->suser = capable(CAP_SYS_ADMIN); 1630 as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; 1631 as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; 1632 spin_lock(&user_list_lock); 1633 as->next = user_list; 1634 user_list = as; 1635 spin_unlock(&user_list_lock); 1636 filp->private_data = as; 1637 return 0; 1638 } 1639 1640 static int proc_apm_show(struct seq_file *m, void *v) 1641 { 1642 unsigned short bx; 1643 unsigned short cx; 1644 unsigned short dx; 1645 int error; 1646 unsigned short ac_line_status = 0xff; 1647 unsigned short battery_status = 0xff; 1648 unsigned short battery_flag = 0xff; 1649 int percentage = -1; 1650 int time_units = -1; 1651 char *units = "?"; 1652 1653 if ((num_online_cpus() == 1) && 1654 !(error = apm_get_power_status(&bx, &cx, &dx))) { 1655 ac_line_status = (bx >> 8) & 0xff; 1656 battery_status = bx & 0xff; 1657 if ((cx & 0xff) != 0xff) 1658 percentage = cx & 0xff; 1659 1660 if (apm_info.connection_version > 0x100) { 1661 battery_flag = (cx >> 8) & 0xff; 1662 if (dx != 0xffff) { 1663 units = (dx & 0x8000) ? "min" : "sec"; 1664 time_units = dx & 0x7fff; 1665 } 1666 } 1667 } 1668 /* Arguments, with symbols from linux/apm_bios.h. Information is 1669 from the Get Power Status (0x0a) call unless otherwise noted. 1670 1671 0) Linux driver version (this will change if format changes) 1672 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. 1673 2) APM flags from APM Installation Check (0x00): 1674 bit 0: APM_16_BIT_SUPPORT 1675 bit 1: APM_32_BIT_SUPPORT 1676 bit 2: APM_IDLE_SLOWS_CLOCK 1677 bit 3: APM_BIOS_DISABLED 1678 bit 4: APM_BIOS_DISENGAGED 1679 3) AC line status 1680 0x00: Off-line 1681 0x01: On-line 1682 0x02: On backup power (BIOS >= 1.1 only) 1683 0xff: Unknown 1684 4) Battery status 1685 0x00: High 1686 0x01: Low 1687 0x02: Critical 1688 0x03: Charging 1689 0x04: Selected battery not present (BIOS >= 1.2 only) 1690 0xff: Unknown 1691 5) Battery flag 1692 bit 0: High 1693 bit 1: Low 1694 bit 2: Critical 1695 bit 3: Charging 1696 bit 7: No system battery 1697 0xff: Unknown 1698 6) Remaining battery life (percentage of charge): 1699 0-100: valid 1700 -1: Unknown 1701 7) Remaining battery life (time units): 1702 Number of remaining minutes or seconds 1703 -1: Unknown 1704 8) min = minutes; sec = seconds */ 1705 1706 seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", 1707 driver_version, 1708 (apm_info.bios.version >> 8) & 0xff, 1709 apm_info.bios.version & 0xff, 1710 apm_info.bios.flags, 1711 ac_line_status, 1712 battery_status, 1713 battery_flag, 1714 percentage, 1715 time_units, 1716 units); 1717 return 0; 1718 } 1719 1720 static int proc_apm_open(struct inode *inode, struct file *file) 1721 { 1722 return single_open(file, proc_apm_show, NULL); 1723 } 1724 1725 static const struct file_operations apm_file_ops = { 1726 .owner = THIS_MODULE, 1727 .open = proc_apm_open, 1728 .read = seq_read, 1729 .llseek = seq_lseek, 1730 .release = single_release, 1731 }; 1732 1733 static int apm(void *unused) 1734 { 1735 unsigned short bx; 1736 unsigned short cx; 1737 unsigned short dx; 1738 int error; 1739 char *power_stat; 1740 char *bat_stat; 1741 1742 /* 2002/08/01 - WT 1743 * This is to avoid random crashes at boot time during initialization 1744 * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. 1745 * Some bioses don't like being called from CPU != 0. 1746 * Method suggested by Ingo Molnar. 1747 */ 1748 set_cpus_allowed_ptr(current, cpumask_of(0)); 1749 BUG_ON(smp_processor_id() != 0); 1750 1751 if (apm_info.connection_version == 0) { 1752 apm_info.connection_version = apm_info.bios.version; 1753 if (apm_info.connection_version > 0x100) { 1754 /* 1755 * We only support BIOSs up to version 1.2 1756 */ 1757 if (apm_info.connection_version > 0x0102) 1758 apm_info.connection_version = 0x0102; 1759 error = apm_driver_version(&apm_info.connection_version); 1760 if (error != APM_SUCCESS) { 1761 apm_error("driver version", error); 1762 /* Fall back to an APM 1.0 connection. */ 1763 apm_info.connection_version = 0x100; 1764 } 1765 } 1766 } 1767 1768 if (debug) 1769 printk(KERN_INFO "apm: Connection version %d.%d\n", 1770 (apm_info.connection_version >> 8) & 0xff, 1771 apm_info.connection_version & 0xff); 1772 1773 #ifdef CONFIG_APM_DO_ENABLE 1774 if (apm_info.bios.flags & APM_BIOS_DISABLED) { 1775 /* 1776 * This call causes my NEC UltraLite Versa 33/C to hang if it 1777 * is booted with PM disabled but not in the docking station. 1778 * Unfortunate ... 1779 */ 1780 error = apm_enable_power_management(1); 1781 if (error) { 1782 apm_error("enable power management", error); 1783 return -1; 1784 } 1785 } 1786 #endif 1787 1788 if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) 1789 && (apm_info.connection_version > 0x0100)) { 1790 error = apm_engage_power_management(APM_DEVICE_ALL, 1); 1791 if (error) { 1792 apm_error("engage power management", error); 1793 return -1; 1794 } 1795 } 1796 1797 if (debug && (num_online_cpus() == 1 || smp)) { 1798 error = apm_get_power_status(&bx, &cx, &dx); 1799 if (error) 1800 printk(KERN_INFO "apm: power status not available\n"); 1801 else { 1802 switch ((bx >> 8) & 0xff) { 1803 case 0: 1804 power_stat = "off line"; 1805 break; 1806 case 1: 1807 power_stat = "on line"; 1808 break; 1809 case 2: 1810 power_stat = "on backup power"; 1811 break; 1812 default: 1813 power_stat = "unknown"; 1814 break; 1815 } 1816 switch (bx & 0xff) { 1817 case 0: 1818 bat_stat = "high"; 1819 break; 1820 case 1: 1821 bat_stat = "low"; 1822 break; 1823 case 2: 1824 bat_stat = "critical"; 1825 break; 1826 case 3: 1827 bat_stat = "charging"; 1828 break; 1829 default: 1830 bat_stat = "unknown"; 1831 break; 1832 } 1833 printk(KERN_INFO 1834 "apm: AC %s, battery status %s, battery life ", 1835 power_stat, bat_stat); 1836 if ((cx & 0xff) == 0xff) 1837 printk("unknown\n"); 1838 else 1839 printk("%d%%\n", cx & 0xff); 1840 if (apm_info.connection_version > 0x100) { 1841 printk(KERN_INFO 1842 "apm: battery flag 0x%02x, battery life ", 1843 (cx >> 8) & 0xff); 1844 if (dx == 0xffff) 1845 printk("unknown\n"); 1846 else 1847 printk("%d %s\n", dx & 0x7fff, 1848 (dx & 0x8000) ? 1849 "minutes" : "seconds"); 1850 } 1851 } 1852 } 1853 1854 /* Install our power off handler.. */ 1855 if (power_off) 1856 pm_power_off = apm_power_off; 1857 1858 if (num_online_cpus() == 1 || smp) { 1859 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1860 console_blank_hook = apm_console_blank; 1861 #endif 1862 apm_mainloop(); 1863 #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) 1864 console_blank_hook = NULL; 1865 #endif 1866 } 1867 1868 return 0; 1869 } 1870 1871 #ifndef MODULE 1872 static int __init apm_setup(char *str) 1873 { 1874 int invert; 1875 1876 while ((str != NULL) && (*str != '\0')) { 1877 if (strncmp(str, "off", 3) == 0) 1878 apm_disabled = 1; 1879 if (strncmp(str, "on", 2) == 0) 1880 apm_disabled = 0; 1881 if ((strncmp(str, "bounce-interval=", 16) == 0) || 1882 (strncmp(str, "bounce_interval=", 16) == 0)) 1883 bounce_interval = simple_strtol(str + 16, NULL, 0); 1884 if ((strncmp(str, "idle-threshold=", 15) == 0) || 1885 (strncmp(str, "idle_threshold=", 15) == 0)) 1886 idle_threshold = simple_strtol(str + 15, NULL, 0); 1887 if ((strncmp(str, "idle-period=", 12) == 0) || 1888 (strncmp(str, "idle_period=", 12) == 0)) 1889 idle_period = simple_strtol(str + 12, NULL, 0); 1890 invert = (strncmp(str, "no-", 3) == 0) || 1891 (strncmp(str, "no_", 3) == 0); 1892 if (invert) 1893 str += 3; 1894 if (strncmp(str, "debug", 5) == 0) 1895 debug = !invert; 1896 if ((strncmp(str, "power-off", 9) == 0) || 1897 (strncmp(str, "power_off", 9) == 0)) 1898 power_off = !invert; 1899 if (strncmp(str, "smp", 3) == 0) { 1900 smp = !invert; 1901 idle_threshold = 100; 1902 } 1903 if ((strncmp(str, "allow-ints", 10) == 0) || 1904 (strncmp(str, "allow_ints", 10) == 0)) 1905 apm_info.allow_ints = !invert; 1906 if ((strncmp(str, "broken-psr", 10) == 0) || 1907 (strncmp(str, "broken_psr", 10) == 0)) 1908 apm_info.get_power_status_broken = !invert; 1909 if ((strncmp(str, "realmode-power-off", 18) == 0) || 1910 (strncmp(str, "realmode_power_off", 18) == 0)) 1911 apm_info.realmode_power_off = !invert; 1912 str = strchr(str, ','); 1913 if (str != NULL) 1914 str += strspn(str, ", \t"); 1915 } 1916 return 1; 1917 } 1918 1919 __setup("apm=", apm_setup); 1920 #endif 1921 1922 static const struct file_operations apm_bios_fops = { 1923 .owner = THIS_MODULE, 1924 .read = do_read, 1925 .poll = do_poll, 1926 .unlocked_ioctl = do_ioctl, 1927 .open = do_open, 1928 .release = do_release, 1929 }; 1930 1931 static struct miscdevice apm_device = { 1932 APM_MINOR_DEV, 1933 "apm_bios", 1934 &apm_bios_fops 1935 }; 1936 1937 1938 /* Simple "print if true" callback */ 1939 static int __init print_if_true(const struct dmi_system_id *d) 1940 { 1941 printk("%s\n", d->ident); 1942 return 0; 1943 } 1944 1945 /* 1946 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was 1947 * disabled before the suspend. Linux used to get terribly confused by that. 1948 */ 1949 static int __init broken_ps2_resume(const struct dmi_system_id *d) 1950 { 1951 printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " 1952 "workaround hopefully not needed.\n", d->ident); 1953 return 0; 1954 } 1955 1956 /* Some bioses have a broken protected mode poweroff and need to use realmode */ 1957 static int __init set_realmode_power_off(const struct dmi_system_id *d) 1958 { 1959 if (apm_info.realmode_power_off == 0) { 1960 apm_info.realmode_power_off = 1; 1961 printk(KERN_INFO "%s bios detected. " 1962 "Using realmode poweroff only.\n", d->ident); 1963 } 1964 return 0; 1965 } 1966 1967 /* Some laptops require interrupts to be enabled during APM calls */ 1968 static int __init set_apm_ints(const struct dmi_system_id *d) 1969 { 1970 if (apm_info.allow_ints == 0) { 1971 apm_info.allow_ints = 1; 1972 printk(KERN_INFO "%s machine detected. " 1973 "Enabling interrupts during APM calls.\n", d->ident); 1974 } 1975 return 0; 1976 } 1977 1978 /* Some APM bioses corrupt memory or just plain do not work */ 1979 static int __init apm_is_horked(const struct dmi_system_id *d) 1980 { 1981 if (apm_info.disabled == 0) { 1982 apm_info.disabled = 1; 1983 printk(KERN_INFO "%s machine detected. " 1984 "Disabling APM.\n", d->ident); 1985 } 1986 return 0; 1987 } 1988 1989 static int __init apm_is_horked_d850md(const struct dmi_system_id *d) 1990 { 1991 if (apm_info.disabled == 0) { 1992 apm_info.disabled = 1; 1993 printk(KERN_INFO "%s machine detected. " 1994 "Disabling APM.\n", d->ident); 1995 printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n"); 1996 printk(KERN_INFO "download from support.intel.com \n"); 1997 } 1998 return 0; 1999 } 2000 2001 /* Some APM bioses hang on APM idle calls */ 2002 static int __init apm_likes_to_melt(const struct dmi_system_id *d) 2003 { 2004 if (apm_info.forbid_idle == 0) { 2005 apm_info.forbid_idle = 1; 2006 printk(KERN_INFO "%s machine detected. " 2007 "Disabling APM idle calls.\n", d->ident); 2008 } 2009 return 0; 2010 } 2011 2012 /* 2013 * Check for clue free BIOS implementations who use 2014 * the following QA technique 2015 * 2016 * [ Write BIOS Code ]<------ 2017 * | ^ 2018 * < Does it Compile >----N-- 2019 * |Y ^ 2020 * < Does it Boot Win98 >-N-- 2021 * |Y 2022 * [Ship It] 2023 * 2024 * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) 2025 * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) 2026 */ 2027 static int __init broken_apm_power(const struct dmi_system_id *d) 2028 { 2029 apm_info.get_power_status_broken = 1; 2030 printk(KERN_WARNING "BIOS strings suggest APM bugs, " 2031 "disabling power status reporting.\n"); 2032 return 0; 2033 } 2034 2035 /* 2036 * This bios swaps the APM minute reporting bytes over (Many sony laptops 2037 * have this problem). 2038 */ 2039 static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) 2040 { 2041 apm_info.get_power_status_swabinminutes = 1; 2042 printk(KERN_WARNING "BIOS strings suggest APM reports battery life " 2043 "in minutes and wrong byte order.\n"); 2044 return 0; 2045 } 2046 2047 static struct dmi_system_id __initdata apm_dmi_table[] = { 2048 { 2049 print_if_true, 2050 KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", 2051 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2052 DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, 2053 }, 2054 { /* Handle problems with APM on the C600 */ 2055 broken_ps2_resume, "Dell Latitude C600", 2056 { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), 2057 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, 2058 }, 2059 { /* Allow interrupts during suspend on Dell Latitude laptops*/ 2060 set_apm_ints, "Dell Latitude", 2061 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2062 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } 2063 }, 2064 { /* APM crashes */ 2065 apm_is_horked, "Dell Inspiron 2500", 2066 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2067 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2068 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2069 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2070 }, 2071 { /* Allow interrupts during suspend on Dell Inspiron laptops*/ 2072 set_apm_ints, "Dell Inspiron", { 2073 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2074 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, 2075 }, 2076 { /* Handle problems with APM on Inspiron 5000e */ 2077 broken_apm_power, "Dell Inspiron 5000e", 2078 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2079 DMI_MATCH(DMI_BIOS_VERSION, "A04"), 2080 DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, 2081 }, 2082 { /* Handle problems with APM on Inspiron 2500 */ 2083 broken_apm_power, "Dell Inspiron 2500", 2084 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2085 DMI_MATCH(DMI_BIOS_VERSION, "A12"), 2086 DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, 2087 }, 2088 { /* APM crashes */ 2089 apm_is_horked, "Dell Dimension 4100", 2090 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2091 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), 2092 DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2093 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2094 }, 2095 { /* Allow interrupts during suspend on Compaq Laptops*/ 2096 set_apm_ints, "Compaq 12XL125", 2097 { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 2098 DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), 2099 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2100 DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, 2101 }, 2102 { /* Allow interrupts during APM or the clock goes slow */ 2103 set_apm_ints, "ASUSTeK", 2104 { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 2105 DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, 2106 }, 2107 { /* APM blows on shutdown */ 2108 apm_is_horked, "ABIT KX7-333[R]", 2109 { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), 2110 DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, 2111 }, 2112 { /* APM crashes */ 2113 apm_is_horked, "Trigem Delhi3", 2114 { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), 2115 DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, 2116 }, 2117 { /* APM crashes */ 2118 apm_is_horked, "Fujitsu-Siemens", 2119 { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), 2120 DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, 2121 }, 2122 { /* APM crashes */ 2123 apm_is_horked_d850md, "Intel D850MD", 2124 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2125 DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, 2126 }, 2127 { /* APM crashes */ 2128 apm_is_horked, "Intel D810EMO", 2129 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2130 DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, 2131 }, 2132 { /* APM crashes */ 2133 apm_is_horked, "Dell XPS-Z", 2134 { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), 2135 DMI_MATCH(DMI_BIOS_VERSION, "A11"), 2136 DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, 2137 }, 2138 { /* APM crashes */ 2139 apm_is_horked, "Sharp PC-PJ/AX", 2140 { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), 2141 DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), 2142 DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), 2143 DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, 2144 }, 2145 { /* APM crashes */ 2146 apm_is_horked, "Dell Inspiron 2500", 2147 { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 2148 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), 2149 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2150 DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, 2151 }, 2152 { /* APM idle hangs */ 2153 apm_likes_to_melt, "Jabil AMD", 2154 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2155 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, 2156 }, 2157 { /* APM idle hangs */ 2158 apm_likes_to_melt, "AMI Bios", 2159 { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 2160 DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, 2161 }, 2162 { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ 2163 swab_apm_power_in_minutes, "Sony VAIO", 2164 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2165 DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), 2166 DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, 2167 }, 2168 { /* Handle problems with APM on Sony Vaio PCG-N505VX */ 2169 swab_apm_power_in_minutes, "Sony VAIO", 2170 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2171 DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), 2172 DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, 2173 }, 2174 { /* Handle problems with APM on Sony Vaio PCG-XG29 */ 2175 swab_apm_power_in_minutes, "Sony VAIO", 2176 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2177 DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), 2178 DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, 2179 }, 2180 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2181 swab_apm_power_in_minutes, "Sony VAIO", 2182 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2183 DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), 2184 DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, 2185 }, 2186 { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ 2187 swab_apm_power_in_minutes, "Sony VAIO", 2188 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2189 DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), 2190 DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, 2191 }, 2192 { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ 2193 swab_apm_power_in_minutes, "Sony VAIO", 2194 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2195 DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), 2196 DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, 2197 }, 2198 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2199 swab_apm_power_in_minutes, "Sony VAIO", 2200 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2201 DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), 2202 DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, 2203 }, 2204 { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ 2205 swab_apm_power_in_minutes, "Sony VAIO", 2206 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2207 DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), 2208 DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, 2209 }, 2210 { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ 2211 swab_apm_power_in_minutes, "Sony VAIO", 2212 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2213 DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), 2214 DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, 2215 }, 2216 { /* Handle problems with APM on Sony Vaio PCG-F104K */ 2217 swab_apm_power_in_minutes, "Sony VAIO", 2218 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2219 DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), 2220 DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, 2221 }, 2222 2223 { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ 2224 swab_apm_power_in_minutes, "Sony VAIO", 2225 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2226 DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), 2227 DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, 2228 }, 2229 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2230 swab_apm_power_in_minutes, "Sony VAIO", 2231 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2232 DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), 2233 DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, 2234 }, 2235 { /* Handle problems with APM on Sony Vaio PCG-C1VE */ 2236 swab_apm_power_in_minutes, "Sony VAIO", 2237 { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 2238 DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), 2239 DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, 2240 }, 2241 { /* broken PM poweroff bios */ 2242 set_realmode_power_off, "Award Software v4.60 PGMA", 2243 { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), 2244 DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), 2245 DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, 2246 }, 2247 2248 /* Generic per vendor APM settings */ 2249 2250 { /* Allow interrupts during suspend on IBM laptops */ 2251 set_apm_ints, "IBM", 2252 { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, 2253 }, 2254 2255 { } 2256 }; 2257 2258 /* 2259 * Just start the APM thread. We do NOT want to do APM BIOS 2260 * calls from anything but the APM thread, if for no other reason 2261 * than the fact that we don't trust the APM BIOS. This way, 2262 * most common APM BIOS problems that lead to protection errors 2263 * etc will have at least some level of being contained... 2264 * 2265 * In short, if something bad happens, at least we have a choice 2266 * of just killing the apm thread.. 2267 */ 2268 static int __init apm_init(void) 2269 { 2270 struct desc_struct *gdt; 2271 int err; 2272 2273 dmi_check_system(apm_dmi_table); 2274 2275 if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { 2276 printk(KERN_INFO "apm: BIOS not found.\n"); 2277 return -ENODEV; 2278 } 2279 printk(KERN_INFO 2280 "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", 2281 ((apm_info.bios.version >> 8) & 0xff), 2282 (apm_info.bios.version & 0xff), 2283 apm_info.bios.flags, 2284 driver_version); 2285 if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { 2286 printk(KERN_INFO "apm: no 32 bit BIOS support\n"); 2287 return -ENODEV; 2288 } 2289 2290 if (allow_ints) 2291 apm_info.allow_ints = 1; 2292 if (broken_psr) 2293 apm_info.get_power_status_broken = 1; 2294 if (realmode_power_off) 2295 apm_info.realmode_power_off = 1; 2296 /* User can override, but default is to trust DMI */ 2297 if (apm_disabled != -1) 2298 apm_info.disabled = apm_disabled; 2299 2300 /* 2301 * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 2302 * but is reportedly a 1.0 BIOS. 2303 */ 2304 if (apm_info.bios.version == 0x001) 2305 apm_info.bios.version = 0x100; 2306 2307 /* BIOS < 1.2 doesn't set cseg_16_len */ 2308 if (apm_info.bios.version < 0x102) 2309 apm_info.bios.cseg_16_len = 0; /* 64k */ 2310 2311 if (debug) { 2312 printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", 2313 apm_info.bios.cseg, apm_info.bios.offset, 2314 apm_info.bios.cseg_16, apm_info.bios.dseg); 2315 if (apm_info.bios.version > 0x100) 2316 printk(" cseg len %x, dseg len %x", 2317 apm_info.bios.cseg_len, 2318 apm_info.bios.dseg_len); 2319 if (apm_info.bios.version > 0x101) 2320 printk(" cseg16 len %x", apm_info.bios.cseg_16_len); 2321 printk("\n"); 2322 } 2323 2324 if (apm_info.disabled) { 2325 printk(KERN_NOTICE "apm: disabled on user request.\n"); 2326 return -ENODEV; 2327 } 2328 if ((num_online_cpus() > 1) && !power_off && !smp) { 2329 printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n"); 2330 apm_info.disabled = 1; 2331 return -ENODEV; 2332 } 2333 if (pm_flags & PM_ACPI) { 2334 printk(KERN_NOTICE "apm: overridden by ACPI.\n"); 2335 apm_info.disabled = 1; 2336 return -ENODEV; 2337 } 2338 pm_flags |= PM_APM; 2339 2340 /* 2341 * Set up the long jump entry point to the APM BIOS, which is called 2342 * from inline assembly. 2343 */ 2344 apm_bios_entry.offset = apm_info.bios.offset; 2345 apm_bios_entry.segment = APM_CS; 2346 2347 /* 2348 * The APM 1.1 BIOS is supposed to provide limit information that it 2349 * recognizes. Many machines do this correctly, but many others do 2350 * not restrict themselves to their claimed limit. When this happens, 2351 * they will cause a segmentation violation in the kernel at boot time. 2352 * Most BIOS's, however, will respect a 64k limit, so we use that. 2353 * 2354 * Note we only set APM segments on CPU zero, since we pin the APM 2355 * code to that CPU. 2356 */ 2357 gdt = get_cpu_gdt_table(0); 2358 set_desc_base(&gdt[APM_CS >> 3], 2359 (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); 2360 set_desc_base(&gdt[APM_CS_16 >> 3], 2361 (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); 2362 set_desc_base(&gdt[APM_DS >> 3], 2363 (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); 2364 2365 proc_create("apm", 0, NULL, &apm_file_ops); 2366 2367 kapmd_task = kthread_create(apm, NULL, "kapmd"); 2368 if (IS_ERR(kapmd_task)) { 2369 printk(KERN_ERR "apm: disabled - Unable to start kernel " 2370 "thread.\n"); 2371 err = PTR_ERR(kapmd_task); 2372 kapmd_task = NULL; 2373 remove_proc_entry("apm", NULL); 2374 return err; 2375 } 2376 wake_up_process(kapmd_task); 2377 2378 if (num_online_cpus() > 1 && !smp) { 2379 printk(KERN_NOTICE 2380 "apm: disabled - APM is not SMP safe (power off active).\n"); 2381 return 0; 2382 } 2383 2384 /* 2385 * Note we don't actually care if the misc_device cannot be registered. 2386 * this driver can do its job without it, even if userspace can't 2387 * control it. just log the error 2388 */ 2389 if (misc_register(&apm_device)) 2390 printk(KERN_WARNING "apm: Could not register misc device.\n"); 2391 2392 if (HZ != 100) 2393 idle_period = (idle_period * HZ) / 100; 2394 if (idle_threshold < 100) { 2395 original_pm_idle = pm_idle; 2396 pm_idle = apm_cpu_idle; 2397 set_pm_idle = 1; 2398 } 2399 2400 return 0; 2401 } 2402 2403 static void __exit apm_exit(void) 2404 { 2405 int error; 2406 2407 if (set_pm_idle) { 2408 pm_idle = original_pm_idle; 2409 /* 2410 * We are about to unload the current idle thread pm callback 2411 * (pm_idle), Wait for all processors to update cached/local 2412 * copies of pm_idle before proceeding. 2413 */ 2414 cpu_idle_wait(); 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 pm_flags &= ~PM_APM; 2431 } 2432 2433 module_init(apm_init); 2434 module_exit(apm_exit); 2435 2436 MODULE_AUTHOR("Stephen Rothwell"); 2437 MODULE_DESCRIPTION("Advanced Power Management"); 2438 MODULE_LICENSE("GPL"); 2439 module_param(debug, bool, 0644); 2440 MODULE_PARM_DESC(debug, "Enable debug mode"); 2441 module_param(power_off, bool, 0444); 2442 MODULE_PARM_DESC(power_off, "Enable power off"); 2443 module_param(bounce_interval, int, 0444); 2444 MODULE_PARM_DESC(bounce_interval, 2445 "Set the number of ticks to ignore suspend bounces"); 2446 module_param(allow_ints, bool, 0444); 2447 MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); 2448 module_param(broken_psr, bool, 0444); 2449 MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); 2450 module_param(realmode_power_off, bool, 0444); 2451 MODULE_PARM_DESC(realmode_power_off, 2452 "Switch to real mode before powering off"); 2453 module_param(idle_threshold, int, 0444); 2454 MODULE_PARM_DESC(idle_threshold, 2455 "System idle percentage above which to make APM BIOS idle calls"); 2456 module_param(idle_period, int, 0444); 2457 MODULE_PARM_DESC(idle_period, 2458 "Period (in sec/100) over which to caculate the idle percentage"); 2459 module_param(smp, bool, 0444); 2460 MODULE_PARM_DESC(smp, 2461 "Set this to enable APM use on an SMP platform. Use with caution on older systems"); 2462 MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); 2463