Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 replacment 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@redhat.com>). |
| 164 | * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin |
| 165 | * calling it - instead idle. (Alan Cox <alan@redhat.com>) |
| 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: |
Kristian Mueller | 3f4b23e | 2006-10-29 22:46:46 -0800 | [diff] [blame] | 201 | * http://www.microsoft.com/whdc/archive/amp_12.mspx] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | */ |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 214 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jeff Garzik | bca73e4 | 2005-11-13 16:06:25 -0800 | [diff] [blame] | 221 | #include <linux/pm_legacy.h> |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 222 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | #include <linux/device.h> |
| 224 | #include <linux/kernel.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 225 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | #include <linux/dmi.h> |
| 228 | #include <linux/suspend.h> |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 229 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | #include <asm/system.h> |
| 232 | #include <asm/uaccess.h> |
| 233 | #include <asm/desc.h> |
Ingo Molnar | 306e440 | 2005-06-30 02:58:55 -0700 | [diff] [blame] | 234 | #include <asm/i8253.h> |
Rusty Russell | 6020c8f | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 235 | #include <asm/paravirt.h> |
Jeremy Fitzhardinge | 07f3331 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 236 | #include <asm/reboot.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | #include "io_ports.h" |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
| 241 | extern int (*console_blank_hook)(int); |
| 242 | #endif |
| 243 | |
| 244 | /* |
| 245 | * The apm_bios device is one of the misc char devices. |
| 246 | * This is its minor number. |
| 247 | */ |
| 248 | #define APM_MINOR_DEV 134 |
| 249 | |
| 250 | /* |
| 251 | * See Documentation/Config.help for the configuration options. |
| 252 | * |
| 253 | * Various options can be changed at boot time as follows: |
| 254 | * (We allow underscores for compatibility with the modules code) |
| 255 | * apm=on/off enable/disable APM |
| 256 | * [no-]allow[-_]ints allow interrupts during BIOS calls |
| 257 | * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call |
| 258 | * [no-]realmode[-_]power[-_]off switch to real mode before |
| 259 | * powering off |
| 260 | * [no-]debug log some debugging messages |
| 261 | * [no-]power[-_]off power off on shutdown |
| 262 | * [no-]smp Use apm even on an SMP box |
| 263 | * bounce[-_]interval=<n> number of ticks to ignore suspend |
| 264 | * bounces |
| 265 | * idle[-_]threshold=<n> System idle percentage above which to |
| 266 | * make APM BIOS idle calls. Set it to |
| 267 | * 100 to disable. |
| 268 | * idle[-_]period=<n> Period (in 1/100s of a second) over |
| 269 | * which the idle percentage is |
| 270 | * calculated. |
| 271 | */ |
| 272 | |
| 273 | /* KNOWN PROBLEM MACHINES: |
| 274 | * |
| 275 | * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant |
| 276 | * [Confirmed by TI representative] |
| 277 | * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification |
| 278 | * [Confirmed by BIOS disassembly] |
| 279 | * [This may work now ...] |
| 280 | * P: Toshiba 1950S: battery life information only gets updated after resume |
| 281 | * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking |
| 282 | * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] |
| 283 | * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP |
| 284 | * Neale Banks <neale@lowendale.com.au> December 2000 |
| 285 | * |
| 286 | * Legend: U = unusable with APM patches |
| 287 | * P = partially usable with APM patches |
| 288 | */ |
| 289 | |
| 290 | /* |
| 291 | * Define as 1 to make the driver always call the APM BIOS busy |
| 292 | * routine even if the clock was not reported as slowed by the |
| 293 | * idle routine. Otherwise, define as 0. |
| 294 | */ |
| 295 | #define ALWAYS_CALL_BUSY 1 |
| 296 | |
| 297 | /* |
| 298 | * Define to make the APM BIOS calls zero all data segment registers (so |
| 299 | * that an incorrect BIOS implementation will cause a kernel panic if it |
| 300 | * tries to write to arbitrary memory). |
| 301 | */ |
| 302 | #define APM_ZERO_SEGS |
| 303 | |
| 304 | #include "apm.h" |
| 305 | |
| 306 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. |
| 308 | * This patched by Chad Miller <cmiller@surfsouth.com>, original code by |
| 309 | * David Chen <chen@ctpa04.mit.edu> |
| 310 | */ |
| 311 | #undef INIT_TIMER_AFTER_SUSPEND |
| 312 | |
| 313 | #ifdef INIT_TIMER_AFTER_SUSPEND |
| 314 | #include <linux/timex.h> |
| 315 | #include <asm/io.h> |
| 316 | #include <linux/delay.h> |
| 317 | #endif |
| 318 | |
| 319 | /* |
| 320 | * Need to poll the APM BIOS every second |
| 321 | */ |
| 322 | #define APM_CHECK_TIMEOUT (HZ) |
| 323 | |
| 324 | /* |
| 325 | * Ignore suspend events for this amount of time after a resume |
| 326 | */ |
| 327 | #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) |
| 328 | |
| 329 | /* |
| 330 | * Maximum number of events stored |
| 331 | */ |
| 332 | #define APM_MAX_EVENTS 20 |
| 333 | |
| 334 | /* |
| 335 | * The per-file APM data |
| 336 | */ |
| 337 | struct apm_user { |
| 338 | int magic; |
| 339 | struct apm_user * next; |
Domen Puncer | 77617bd | 2005-06-25 14:58:45 -0700 | [diff] [blame] | 340 | unsigned int suser: 1; |
| 341 | unsigned int writer: 1; |
| 342 | unsigned int reader: 1; |
| 343 | unsigned int suspend_wait: 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | int suspend_result; |
| 345 | int suspends_pending; |
| 346 | int standbys_pending; |
| 347 | int suspends_read; |
| 348 | int standbys_read; |
| 349 | int event_head; |
| 350 | int event_tail; |
| 351 | apm_event_t events[APM_MAX_EVENTS]; |
| 352 | }; |
| 353 | |
| 354 | /* |
| 355 | * The magic number in apm_user |
| 356 | */ |
| 357 | #define APM_BIOS_MAGIC 0x4101 |
| 358 | |
| 359 | /* |
| 360 | * idle percentage above which bios idle calls are done |
| 361 | */ |
| 362 | #ifdef CONFIG_APM_CPU_IDLE |
| 363 | #define DEFAULT_IDLE_THRESHOLD 95 |
| 364 | #else |
| 365 | #define DEFAULT_IDLE_THRESHOLD 100 |
| 366 | #endif |
| 367 | #define DEFAULT_IDLE_PERIOD (100 / 3) |
| 368 | |
| 369 | /* |
| 370 | * Local variables |
| 371 | */ |
| 372 | static struct { |
| 373 | unsigned long offset; |
| 374 | unsigned short segment; |
| 375 | } apm_bios_entry; |
| 376 | static int clock_slowed; |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 377 | static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; |
| 378 | static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | static int set_pm_idle; |
| 380 | static int suspends_pending; |
| 381 | static int standbys_pending; |
| 382 | static int ignore_sys_suspend; |
| 383 | static int ignore_normal_resume; |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 384 | static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 386 | static int debug __read_mostly; |
| 387 | static int smp __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | static int apm_disabled = -1; |
| 389 | #ifdef CONFIG_SMP |
| 390 | static int power_off; |
| 391 | #else |
| 392 | static int power_off = 1; |
| 393 | #endif |
| 394 | #ifdef CONFIG_APM_REAL_MODE_POWER_OFF |
| 395 | static int realmode_power_off = 1; |
| 396 | #else |
| 397 | static int realmode_power_off; |
| 398 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | #ifdef CONFIG_APM_ALLOW_INTS |
| 400 | static int allow_ints = 1; |
| 401 | #else |
| 402 | static int allow_ints; |
| 403 | #endif |
| 404 | static int broken_psr; |
| 405 | |
| 406 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); |
| 407 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); |
| 408 | static struct apm_user * user_list; |
| 409 | static DEFINE_SPINLOCK(user_list_lock); |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 410 | static const struct desc_struct bad_bios_desc = { 0, 0x00409200 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 412 | static const char driver_version[] = "1.16ac"; /* no spaces */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 414 | static struct task_struct *kapmd_task; |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | /* |
| 417 | * APM event names taken from the APM 1.2 specification. These are |
| 418 | * the message codes that the BIOS uses to tell us about events |
| 419 | */ |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 420 | static const char * const apm_event_name[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | "system standby", |
| 422 | "system suspend", |
| 423 | "normal resume", |
| 424 | "critical resume", |
| 425 | "low battery", |
| 426 | "power status change", |
| 427 | "update time", |
| 428 | "critical suspend", |
| 429 | "user standby", |
| 430 | "user suspend", |
| 431 | "system standby resume", |
| 432 | "capabilities change" |
| 433 | }; |
Tobias Klauser | 38e548e | 2005-11-07 00:58:31 -0800 | [diff] [blame] | 434 | #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | typedef struct lookup_t { |
| 437 | int key; |
| 438 | char * msg; |
| 439 | } lookup_t; |
| 440 | |
| 441 | /* |
| 442 | * The BIOS returns a set of standard error codes in AX when the |
| 443 | * carry flag is set. |
| 444 | */ |
| 445 | |
| 446 | static const lookup_t error_table[] = { |
| 447 | /* N/A { APM_SUCCESS, "Operation succeeded" }, */ |
| 448 | { APM_DISABLED, "Power management disabled" }, |
| 449 | { APM_CONNECTED, "Real mode interface already connected" }, |
| 450 | { APM_NOT_CONNECTED, "Interface not connected" }, |
| 451 | { APM_16_CONNECTED, "16 bit interface already connected" }, |
| 452 | /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ |
| 453 | { APM_32_CONNECTED, "32 bit interface already connected" }, |
| 454 | { APM_32_UNSUPPORTED, "32 bit interface not supported" }, |
| 455 | { APM_BAD_DEVICE, "Unrecognized device ID" }, |
| 456 | { APM_BAD_PARAM, "Parameter out of range" }, |
| 457 | { APM_NOT_ENGAGED, "Interface not engaged" }, |
| 458 | { APM_BAD_FUNCTION, "Function not supported" }, |
| 459 | { APM_RESUME_DISABLED, "Resume timer disabled" }, |
| 460 | { APM_BAD_STATE, "Unable to enter requested state" }, |
| 461 | /* N/A { APM_NO_EVENTS, "No events pending" }, */ |
| 462 | { APM_NO_ERROR, "BIOS did not set a return code" }, |
| 463 | { APM_NOT_PRESENT, "No APM present" } |
| 464 | }; |
Tobias Klauser | 38e548e | 2005-11-07 00:58:31 -0800 | [diff] [blame] | 465 | #define ERROR_COUNT ARRAY_SIZE(error_table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | /** |
| 468 | * apm_error - display an APM error |
| 469 | * @str: information string |
| 470 | * @err: APM BIOS return code |
| 471 | * |
| 472 | * Write a meaningful log entry to the kernel log in the event of |
| 473 | * an APM error. |
| 474 | */ |
| 475 | |
| 476 | static void apm_error(char *str, int err) |
| 477 | { |
| 478 | int i; |
| 479 | |
| 480 | for (i = 0; i < ERROR_COUNT; i++) |
| 481 | if (error_table[i].key == err) break; |
| 482 | if (i < ERROR_COUNT) |
| 483 | printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg); |
| 484 | else |
| 485 | printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n", |
| 486 | str, err); |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * Lock APM functionality to physical CPU 0 |
| 491 | */ |
| 492 | |
| 493 | #ifdef CONFIG_SMP |
| 494 | |
| 495 | static cpumask_t apm_save_cpus(void) |
| 496 | { |
| 497 | cpumask_t x = current->cpus_allowed; |
| 498 | /* Some bioses don't like being called from CPU != 0 */ |
| 499 | set_cpus_allowed(current, cpumask_of_cpu(0)); |
| 500 | BUG_ON(smp_processor_id() != 0); |
| 501 | return x; |
| 502 | } |
| 503 | |
| 504 | static inline void apm_restore_cpus(cpumask_t mask) |
| 505 | { |
| 506 | set_cpus_allowed(current, mask); |
| 507 | } |
| 508 | |
| 509 | #else |
| 510 | |
| 511 | /* |
| 512 | * No CPU lockdown needed on a uniprocessor |
| 513 | */ |
| 514 | |
| 515 | #define apm_save_cpus() (current->cpus_allowed) |
| 516 | #define apm_restore_cpus(x) (void)(x) |
| 517 | |
| 518 | #endif |
| 519 | |
| 520 | /* |
| 521 | * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and |
| 522 | * apm_info.allow_ints, we are being really paranoid here! Not only |
| 523 | * are interrupts disabled, but all the segment registers (except SS) |
| 524 | * are saved and zeroed this means that if the BIOS tries to reference |
| 525 | * any data without explicitly loading the segment registers, the kernel |
| 526 | * will fault immediately rather than have some unforeseen circumstances |
| 527 | * for the rest of the kernel. And it will be very obvious! :-) Doing |
| 528 | * this depends on CS referring to the same physical memory as DS so that |
| 529 | * DS can be zeroed before the call. Unfortunately, we can't do anything |
| 530 | * about the stack segment/pointer. Also, we tell the compiler that |
| 531 | * everything could change. |
| 532 | * |
| 533 | * Also, we KNOW that for the non error case of apm_bios_call, there |
| 534 | * is no useful data returned in the low order 8 bits of eax. |
| 535 | */ |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 536 | |
| 537 | static inline unsigned long __apm_irq_save(void) |
| 538 | { |
| 539 | unsigned long flags; |
| 540 | local_save_flags(flags); |
| 541 | if (apm_info.allow_ints) { |
| 542 | if (irqs_disabled_flags(flags)) |
| 543 | local_irq_enable(); |
| 544 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | local_irq_disable(); |
| 546 | |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 547 | return flags; |
| 548 | } |
| 549 | |
| 550 | #define apm_irq_save(flags) \ |
| 551 | do { flags = __apm_irq_save(); } while (0) |
| 552 | |
| 553 | static inline void apm_irq_restore(unsigned long flags) |
| 554 | { |
| 555 | if (irqs_disabled_flags(flags)) |
| 556 | local_irq_disable(); |
| 557 | else if (irqs_disabled()) |
| 558 | local_irq_enable(); |
| 559 | } |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | #ifdef APM_ZERO_SEGS |
| 562 | # define APM_DECL_SEGS \ |
| 563 | unsigned int saved_fs; unsigned int saved_gs; |
| 564 | # define APM_DO_SAVE_SEGS \ |
| 565 | savesegment(fs, saved_fs); savesegment(gs, saved_gs) |
| 566 | # define APM_DO_RESTORE_SEGS \ |
| 567 | loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) |
| 568 | #else |
| 569 | # define APM_DECL_SEGS |
| 570 | # define APM_DO_SAVE_SEGS |
| 571 | # define APM_DO_RESTORE_SEGS |
| 572 | #endif |
| 573 | |
| 574 | /** |
| 575 | * apm_bios_call - Make an APM BIOS 32bit call |
| 576 | * @func: APM function to execute |
| 577 | * @ebx_in: EBX register for call entry |
| 578 | * @ecx_in: ECX register for call entry |
| 579 | * @eax: EAX register return |
| 580 | * @ebx: EBX register return |
| 581 | * @ecx: ECX register return |
| 582 | * @edx: EDX register return |
| 583 | * @esi: ESI register return |
| 584 | * |
| 585 | * Make an APM call using the 32bit protected mode interface. The |
| 586 | * caller is responsible for knowing if APM BIOS is configured and |
| 587 | * enabled. This call can disable interrupts for a long period of |
| 588 | * time on some laptops. The return value is in AH and the carry |
| 589 | * flag is loaded into AL. If there is an error, then the error |
| 590 | * code is returned in AH (bits 8-15 of eax) and this function |
| 591 | * returns non-zero. |
| 592 | */ |
| 593 | |
| 594 | static u8 apm_bios_call(u32 func, u32 ebx_in, u32 ecx_in, |
| 595 | u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, u32 *esi) |
| 596 | { |
| 597 | APM_DECL_SEGS |
| 598 | unsigned long flags; |
| 599 | cpumask_t cpus; |
| 600 | int cpu; |
| 601 | struct desc_struct save_desc_40; |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 602 | struct desc_struct *gdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | cpus = apm_save_cpus(); |
| 605 | |
| 606 | cpu = get_cpu(); |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 607 | gdt = get_cpu_gdt_table(cpu); |
| 608 | save_desc_40 = gdt[0x40 / 8]; |
| 609 | gdt[0x40 / 8] = bad_bios_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 611 | apm_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | APM_DO_SAVE_SEGS; |
| 613 | apm_bios_call_asm(func, ebx_in, ecx_in, eax, ebx, ecx, edx, esi); |
| 614 | APM_DO_RESTORE_SEGS; |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 615 | apm_irq_restore(flags); |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 616 | gdt[0x40 / 8] = save_desc_40; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | put_cpu(); |
| 618 | apm_restore_cpus(cpus); |
| 619 | |
| 620 | return *eax & 0xff; |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * apm_bios_call_simple - make a simple APM BIOS 32bit call |
| 625 | * @func: APM function to invoke |
| 626 | * @ebx_in: EBX register value for BIOS call |
| 627 | * @ecx_in: ECX register value for BIOS call |
| 628 | * @eax: EAX register on return from the BIOS call |
| 629 | * |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 630 | * Make a BIOS call that returns one value only, or just status. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | * If there is an error, then the error code is returned in AH |
| 632 | * (bits 8-15 of eax) and this function returns non-zero. This is |
| 633 | * used for simpler BIOS operations. This call may hold interrupts |
| 634 | * off for a long time on some laptops. |
| 635 | */ |
| 636 | |
| 637 | static u8 apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax) |
| 638 | { |
| 639 | u8 error; |
| 640 | APM_DECL_SEGS |
| 641 | unsigned long flags; |
| 642 | cpumask_t cpus; |
| 643 | int cpu; |
| 644 | struct desc_struct save_desc_40; |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 645 | struct desc_struct *gdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | cpus = apm_save_cpus(); |
| 648 | |
| 649 | cpu = get_cpu(); |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 650 | gdt = get_cpu_gdt_table(cpu); |
| 651 | save_desc_40 = gdt[0x40 / 8]; |
| 652 | gdt[0x40 / 8] = bad_bios_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 654 | apm_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | APM_DO_SAVE_SEGS; |
| 656 | error = apm_bios_call_simple_asm(func, ebx_in, ecx_in, eax); |
| 657 | APM_DO_RESTORE_SEGS; |
Peter Zijlstra | 3864c48 | 2006-10-17 00:10:26 -0700 | [diff] [blame] | 658 | apm_irq_restore(flags); |
Zachary Amsden | 251e691 | 2005-10-30 14:59:34 -0800 | [diff] [blame] | 659 | gdt[0x40 / 8] = save_desc_40; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | put_cpu(); |
| 661 | apm_restore_cpus(cpus); |
| 662 | return error; |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * apm_driver_version - APM driver version |
| 667 | * @val: loaded with the APM version on return |
| 668 | * |
| 669 | * Retrieve the APM version supported by the BIOS. This is only |
| 670 | * supported for APM 1.1 or higher. An error indicates APM 1.0 is |
| 671 | * probably present. |
| 672 | * |
| 673 | * On entry val should point to a value indicating the APM driver |
| 674 | * version with the high byte being the major and the low byte the |
| 675 | * minor number both in BCD |
| 676 | * |
| 677 | * On return it will hold the BIOS revision supported in the |
| 678 | * same format. |
| 679 | */ |
| 680 | |
| 681 | static int apm_driver_version(u_short *val) |
| 682 | { |
| 683 | u32 eax; |
| 684 | |
| 685 | if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax)) |
| 686 | return (eax >> 8) & 0xff; |
| 687 | *val = eax; |
| 688 | return APM_SUCCESS; |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * apm_get_event - get an APM event from the BIOS |
| 693 | * @event: pointer to the event |
| 694 | * @info: point to the event information |
| 695 | * |
| 696 | * The APM BIOS provides a polled information for event |
| 697 | * reporting. The BIOS expects to be polled at least every second |
| 698 | * when events are pending. When a message is found the caller should |
| 699 | * poll until no more messages are present. However, this causes |
| 700 | * problems on some laptops where a suspend event notification is |
| 701 | * not cleared until it is acknowledged. |
| 702 | * |
| 703 | * Additional information is returned in the info pointer, providing |
| 704 | * that APM 1.2 is in use. If no messges are pending the value 0x80 |
| 705 | * is returned (No power management events pending). |
| 706 | */ |
| 707 | |
| 708 | static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) |
| 709 | { |
| 710 | u32 eax; |
| 711 | u32 ebx; |
| 712 | u32 ecx; |
| 713 | u32 dummy; |
| 714 | |
| 715 | if (apm_bios_call(APM_FUNC_GET_EVENT, 0, 0, &eax, &ebx, &ecx, |
| 716 | &dummy, &dummy)) |
| 717 | return (eax >> 8) & 0xff; |
| 718 | *event = ebx; |
| 719 | if (apm_info.connection_version < 0x0102) |
| 720 | *info = ~0; /* indicate info not valid */ |
| 721 | else |
| 722 | *info = ecx; |
| 723 | return APM_SUCCESS; |
| 724 | } |
| 725 | |
| 726 | /** |
| 727 | * set_power_state - set the power management state |
| 728 | * @what: which items to transition |
| 729 | * @state: state to transition to |
| 730 | * |
| 731 | * Request an APM change of state for one or more system devices. The |
| 732 | * processor state must be transitioned last of all. what holds the |
| 733 | * class of device in the upper byte and the device number (0xFF for |
| 734 | * all) for the object to be transitioned. |
| 735 | * |
| 736 | * The state holds the state to transition to, which may in fact |
| 737 | * be an acceptance of a BIOS requested state change. |
| 738 | */ |
| 739 | |
| 740 | static int set_power_state(u_short what, u_short state) |
| 741 | { |
| 742 | u32 eax; |
| 743 | |
| 744 | if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax)) |
| 745 | return (eax >> 8) & 0xff; |
| 746 | return APM_SUCCESS; |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * set_system_power_state - set system wide power state |
| 751 | * @state: which state to enter |
| 752 | * |
| 753 | * Transition the entire system into a new APM power state. |
| 754 | */ |
| 755 | |
| 756 | static int set_system_power_state(u_short state) |
| 757 | { |
| 758 | return set_power_state(APM_DEVICE_ALL, state); |
| 759 | } |
| 760 | |
| 761 | /** |
| 762 | * apm_do_idle - perform power saving |
| 763 | * |
| 764 | * This function notifies the BIOS that the processor is (in the view |
| 765 | * of the OS) idle. It returns -1 in the event that the BIOS refuses |
| 766 | * to handle the idle request. On a success the function returns 1 |
| 767 | * if the BIOS did clock slowing or 0 otherwise. |
| 768 | */ |
| 769 | |
| 770 | static int apm_do_idle(void) |
| 771 | { |
| 772 | u32 eax; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 773 | u8 ret = 0; |
| 774 | int idled = 0; |
| 775 | int polling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 777 | polling = !!(current_thread_info()->status & TS_POLLING); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 778 | if (polling) { |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 779 | current_thread_info()->status &= ~TS_POLLING; |
Ingo Molnar | 0888f06 | 2006-12-22 01:11:56 -0800 | [diff] [blame] | 780 | /* |
| 781 | * TS_POLLING-cleared state must be visible before we |
| 782 | * test NEED_RESCHED: |
| 783 | */ |
| 784 | smp_mb(); |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 785 | } |
| 786 | if (!need_resched()) { |
| 787 | idled = 1; |
| 788 | ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax); |
| 789 | } |
| 790 | if (polling) |
Andi Kleen | 495ab9c | 2006-06-26 13:59:11 +0200 | [diff] [blame] | 791 | current_thread_info()->status |= TS_POLLING; |
Nick Piggin | 64c7c8f | 2005-11-08 21:39:04 -0800 | [diff] [blame] | 792 | |
| 793 | if (!idled) |
| 794 | return 0; |
| 795 | |
| 796 | if (ret) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | static unsigned long t; |
| 798 | |
| 799 | /* This always fails on some SMP boards running UP kernels. |
| 800 | * Only report the failure the first 5 times. |
| 801 | */ |
| 802 | if (++t < 5) |
| 803 | { |
| 804 | printk(KERN_DEBUG "apm_do_idle failed (%d)\n", |
| 805 | (eax >> 8) & 0xff); |
| 806 | t = jiffies; |
| 807 | } |
| 808 | return -1; |
| 809 | } |
| 810 | clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; |
| 811 | return clock_slowed; |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * apm_do_busy - inform the BIOS the CPU is busy |
| 816 | * |
| 817 | * Request that the BIOS brings the CPU back to full performance. |
| 818 | */ |
| 819 | |
| 820 | static void apm_do_busy(void) |
| 821 | { |
| 822 | u32 dummy; |
| 823 | |
| 824 | if (clock_slowed || ALWAYS_CALL_BUSY) { |
| 825 | (void) apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy); |
| 826 | clock_slowed = 0; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * If no process has really been interested in |
| 832 | * the CPU for some time, we want to call BIOS |
| 833 | * power management - we probably want |
| 834 | * to conserve power. |
| 835 | */ |
| 836 | #define IDLE_CALC_LIMIT (HZ * 100) |
| 837 | #define IDLE_LEAKY_MAX 16 |
| 838 | |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 839 | static void (*original_pm_idle)(void) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | /** |
| 842 | * apm_cpu_idle - cpu idling for APM capable Linux |
| 843 | * |
| 844 | * This is the idling function the kernel executes when APM is available. It |
| 845 | * tries to do BIOS powermanagement based on the average system idle time. |
| 846 | * Furthermore it calls the system default idle routine. |
| 847 | */ |
| 848 | |
| 849 | static void apm_cpu_idle(void) |
| 850 | { |
| 851 | static int use_apm_idle; /* = 0 */ |
| 852 | static unsigned int last_jiffies; /* = 0 */ |
| 853 | static unsigned int last_stime; /* = 0 */ |
| 854 | |
| 855 | int apm_idle_done = 0; |
| 856 | unsigned int jiffies_since_last_check = jiffies - last_jiffies; |
| 857 | unsigned int bucket; |
| 858 | |
| 859 | recalc: |
| 860 | if (jiffies_since_last_check > IDLE_CALC_LIMIT) { |
| 861 | use_apm_idle = 0; |
| 862 | last_jiffies = jiffies; |
| 863 | last_stime = current->stime; |
| 864 | } else if (jiffies_since_last_check > idle_period) { |
| 865 | unsigned int idle_percentage; |
| 866 | |
| 867 | idle_percentage = current->stime - last_stime; |
| 868 | idle_percentage *= 100; |
| 869 | idle_percentage /= jiffies_since_last_check; |
| 870 | use_apm_idle = (idle_percentage > idle_threshold); |
| 871 | if (apm_info.forbid_idle) |
| 872 | use_apm_idle = 0; |
| 873 | last_jiffies = jiffies; |
| 874 | last_stime = current->stime; |
| 875 | } |
| 876 | |
| 877 | bucket = IDLE_LEAKY_MAX; |
| 878 | |
| 879 | while (!need_resched()) { |
| 880 | if (use_apm_idle) { |
| 881 | unsigned int t; |
| 882 | |
| 883 | t = jiffies; |
| 884 | switch (apm_do_idle()) { |
| 885 | case 0: apm_idle_done = 1; |
| 886 | if (t != jiffies) { |
| 887 | if (bucket) { |
| 888 | bucket = IDLE_LEAKY_MAX; |
| 889 | continue; |
| 890 | } |
| 891 | } else if (bucket) { |
| 892 | bucket--; |
| 893 | continue; |
| 894 | } |
| 895 | break; |
| 896 | case 1: apm_idle_done = 1; |
| 897 | break; |
| 898 | default: /* BIOS refused */ |
| 899 | break; |
| 900 | } |
| 901 | } |
| 902 | if (original_pm_idle) |
| 903 | original_pm_idle(); |
| 904 | else |
| 905 | default_idle(); |
| 906 | jiffies_since_last_check = jiffies - last_jiffies; |
| 907 | if (jiffies_since_last_check > idle_period) |
| 908 | goto recalc; |
| 909 | } |
| 910 | |
| 911 | if (apm_idle_done) |
| 912 | apm_do_busy(); |
| 913 | } |
| 914 | |
| 915 | /** |
| 916 | * apm_power_off - ask the BIOS to power off |
| 917 | * |
| 918 | * Handle the power off sequence. This is the one piece of code we |
| 919 | * will execute even on SMP machines. In order to deal with BIOS |
| 920 | * bugs we support real mode APM BIOS power off calls. We also make |
| 921 | * the SMP call on CPU0 as some systems will only honour this call |
| 922 | * on their first cpu. |
| 923 | */ |
| 924 | |
| 925 | static void apm_power_off(void) |
| 926 | { |
| 927 | unsigned char po_bios_call[] = { |
| 928 | 0xb8, 0x00, 0x10, /* movw $0x1000,ax */ |
| 929 | 0x8e, 0xd0, /* movw ax,ss */ |
| 930 | 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */ |
| 931 | 0xb8, 0x07, 0x53, /* movw $0x5307,ax */ |
| 932 | 0xbb, 0x01, 0x00, /* movw $0x0001,bx */ |
| 933 | 0xb9, 0x03, 0x00, /* movw $0x0003,cx */ |
| 934 | 0xcd, 0x15 /* int $0x15 */ |
| 935 | }; |
| 936 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | /* Some bioses don't like being called from CPU != 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | if (apm_info.realmode_power_off) |
| 939 | { |
| 940 | (void)apm_save_cpus(); |
| 941 | machine_real_restart(po_bios_call, sizeof(po_bios_call)); |
| 942 | } |
| 943 | else |
| 944 | (void) set_system_power_state(APM_STATE_OFF); |
| 945 | } |
| 946 | |
| 947 | #ifdef CONFIG_APM_DO_ENABLE |
| 948 | |
| 949 | /** |
| 950 | * apm_enable_power_management - enable BIOS APM power management |
| 951 | * @enable: enable yes/no |
| 952 | * |
| 953 | * Enable or disable the APM BIOS power services. |
| 954 | */ |
| 955 | |
| 956 | static int apm_enable_power_management(int enable) |
| 957 | { |
| 958 | u32 eax; |
| 959 | |
| 960 | if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) |
| 961 | return APM_NOT_ENGAGED; |
| 962 | if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, |
| 963 | enable, &eax)) |
| 964 | return (eax >> 8) & 0xff; |
| 965 | if (enable) |
| 966 | apm_info.bios.flags &= ~APM_BIOS_DISABLED; |
| 967 | else |
| 968 | apm_info.bios.flags |= APM_BIOS_DISABLED; |
| 969 | return APM_SUCCESS; |
| 970 | } |
| 971 | #endif |
| 972 | |
| 973 | /** |
| 974 | * apm_get_power_status - get current power state |
| 975 | * @status: returned status |
| 976 | * @bat: battery info |
| 977 | * @life: estimated life |
| 978 | * |
| 979 | * Obtain the current power status from the APM BIOS. We return a |
| 980 | * status which gives the rough battery status, and current power |
| 981 | * source. The bat value returned give an estimate as a percentage |
| 982 | * of life and a status value for the battery. The estimated life |
| 983 | * if reported is a lifetime in secodnds/minutes at current powwer |
| 984 | * consumption. |
| 985 | */ |
| 986 | |
| 987 | static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) |
| 988 | { |
| 989 | u32 eax; |
| 990 | u32 ebx; |
| 991 | u32 ecx; |
| 992 | u32 edx; |
| 993 | u32 dummy; |
| 994 | |
| 995 | if (apm_info.get_power_status_broken) |
| 996 | return APM_32_UNSUPPORTED; |
| 997 | if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0, |
| 998 | &eax, &ebx, &ecx, &edx, &dummy)) |
| 999 | return (eax >> 8) & 0xff; |
| 1000 | *status = ebx; |
| 1001 | *bat = ecx; |
| 1002 | if (apm_info.get_power_status_swabinminutes) { |
| 1003 | *life = swab16((u16)edx); |
| 1004 | *life |= 0x8000; |
| 1005 | } else |
| 1006 | *life = edx; |
| 1007 | return APM_SUCCESS; |
| 1008 | } |
| 1009 | |
| 1010 | #if 0 |
| 1011 | static int apm_get_battery_status(u_short which, u_short *status, |
| 1012 | u_short *bat, u_short *life, u_short *nbat) |
| 1013 | { |
| 1014 | u32 eax; |
| 1015 | u32 ebx; |
| 1016 | u32 ecx; |
| 1017 | u32 edx; |
| 1018 | u32 esi; |
| 1019 | |
| 1020 | if (apm_info.connection_version < 0x0102) { |
| 1021 | /* pretend we only have one battery. */ |
| 1022 | if (which != 1) |
| 1023 | return APM_BAD_DEVICE; |
| 1024 | *nbat = 1; |
| 1025 | return apm_get_power_status(status, bat, life); |
| 1026 | } |
| 1027 | |
| 1028 | if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, |
| 1029 | &ebx, &ecx, &edx, &esi)) |
| 1030 | return (eax >> 8) & 0xff; |
| 1031 | *status = ebx; |
| 1032 | *bat = ecx; |
| 1033 | *life = edx; |
| 1034 | *nbat = esi; |
| 1035 | return APM_SUCCESS; |
| 1036 | } |
| 1037 | #endif |
| 1038 | |
| 1039 | /** |
| 1040 | * apm_engage_power_management - enable PM on a device |
| 1041 | * @device: identity of device |
| 1042 | * @enable: on/off |
| 1043 | * |
| 1044 | * Activate or deactive power management on either a specific device |
| 1045 | * or the entire system (%APM_DEVICE_ALL). |
| 1046 | */ |
| 1047 | |
| 1048 | static int apm_engage_power_management(u_short device, int enable) |
| 1049 | { |
| 1050 | u32 eax; |
| 1051 | |
| 1052 | if ((enable == 0) && (device == APM_DEVICE_ALL) |
| 1053 | && (apm_info.bios.flags & APM_BIOS_DISABLED)) |
| 1054 | return APM_DISABLED; |
| 1055 | if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax)) |
| 1056 | return (eax >> 8) & 0xff; |
| 1057 | if (device == APM_DEVICE_ALL) { |
| 1058 | if (enable) |
| 1059 | apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; |
| 1060 | else |
| 1061 | apm_info.bios.flags |= APM_BIOS_DISENGAGED; |
| 1062 | } |
| 1063 | return APM_SUCCESS; |
| 1064 | } |
| 1065 | |
| 1066 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
| 1067 | |
| 1068 | /** |
| 1069 | * apm_console_blank - blank the display |
| 1070 | * @blank: on/off |
| 1071 | * |
| 1072 | * Attempt to blank the console, firstly by blanking just video device |
| 1073 | * zero, and if that fails (some BIOSes don't support it) then it blanks |
| 1074 | * all video devices. Typically the BIOS will do laptop backlight and |
| 1075 | * monitor powerdown for us. |
| 1076 | */ |
| 1077 | |
| 1078 | static int apm_console_blank(int blank) |
| 1079 | { |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 1080 | int error = APM_NOT_ENGAGED; /* silence gcc */ |
| 1081 | int i; |
Jordan Crouse | 3841b0a | 2006-01-06 00:12:16 -0800 | [diff] [blame] | 1082 | u_short state; |
| 1083 | static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | |
| 1085 | state = blank ? APM_STATE_STANDBY : APM_STATE_READY; |
Jordan Crouse | 3841b0a | 2006-01-06 00:12:16 -0800 | [diff] [blame] | 1086 | |
| 1087 | for (i = 0; i < ARRAY_SIZE(dev); i++) { |
| 1088 | error = set_power_state(dev[i], state); |
| 1089 | |
| 1090 | if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) |
| 1091 | return 1; |
| 1092 | |
| 1093 | if (error == APM_NOT_ENGAGED) |
| 1094 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | } |
Jordan Crouse | 3841b0a | 2006-01-06 00:12:16 -0800 | [diff] [blame] | 1096 | |
Samuel Thibault | 7337445 | 2006-04-18 22:21:50 -0700 | [diff] [blame] | 1097 | if (error == APM_NOT_ENGAGED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | static int tried; |
| 1099 | int eng_error; |
| 1100 | if (tried++ == 0) { |
| 1101 | eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); |
| 1102 | if (eng_error) { |
| 1103 | apm_error("set display", error); |
| 1104 | apm_error("engage interface", eng_error); |
| 1105 | return 0; |
| 1106 | } else |
| 1107 | return apm_console_blank(blank); |
| 1108 | } |
| 1109 | } |
| 1110 | apm_error("set display", error); |
| 1111 | return 0; |
| 1112 | } |
| 1113 | #endif |
| 1114 | |
| 1115 | static int queue_empty(struct apm_user *as) |
| 1116 | { |
| 1117 | return as->event_head == as->event_tail; |
| 1118 | } |
| 1119 | |
| 1120 | static apm_event_t get_queued_event(struct apm_user *as) |
| 1121 | { |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 1122 | if (++as->event_tail >= APM_MAX_EVENTS) |
| 1123 | as->event_tail = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | return as->events[as->event_tail]; |
| 1125 | } |
| 1126 | |
| 1127 | static void queue_event(apm_event_t event, struct apm_user *sender) |
| 1128 | { |
| 1129 | struct apm_user * as; |
| 1130 | |
| 1131 | spin_lock(&user_list_lock); |
| 1132 | if (user_list == NULL) |
| 1133 | goto out; |
| 1134 | for (as = user_list; as != NULL; as = as->next) { |
| 1135 | if ((as == sender) || (!as->reader)) |
| 1136 | continue; |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 1137 | if (++as->event_head >= APM_MAX_EVENTS) |
| 1138 | as->event_head = 0; |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | if (as->event_head == as->event_tail) { |
| 1141 | static int notified; |
| 1142 | |
| 1143 | if (notified++ == 0) |
| 1144 | printk(KERN_ERR "apm: an event queue overflowed\n"); |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 1145 | if (++as->event_tail >= APM_MAX_EVENTS) |
| 1146 | as->event_tail = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | } |
| 1148 | as->events[as->event_head] = event; |
| 1149 | if ((!as->suser) || (!as->writer)) |
| 1150 | continue; |
| 1151 | switch (event) { |
| 1152 | case APM_SYS_SUSPEND: |
| 1153 | case APM_USER_SUSPEND: |
| 1154 | as->suspends_pending++; |
| 1155 | suspends_pending++; |
| 1156 | break; |
| 1157 | |
| 1158 | case APM_SYS_STANDBY: |
| 1159 | case APM_USER_STANDBY: |
| 1160 | as->standbys_pending++; |
| 1161 | standbys_pending++; |
| 1162 | break; |
| 1163 | } |
| 1164 | } |
| 1165 | wake_up_interruptible(&apm_waitqueue); |
| 1166 | out: |
| 1167 | spin_unlock(&user_list_lock); |
| 1168 | } |
| 1169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | static void reinit_timer(void) |
| 1171 | { |
| 1172 | #ifdef INIT_TIMER_AFTER_SUSPEND |
Ingo Molnar | 306e440 | 2005-06-30 02:58:55 -0700 | [diff] [blame] | 1173 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
| 1175 | spin_lock_irqsave(&i8253_lock, flags); |
Alan Cox | c991938 | 2007-05-08 00:29:58 -0700 | [diff] [blame] | 1176 | /* set the clock to HZ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ |
| 1178 | udelay(10); |
| 1179 | outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ |
| 1180 | udelay(10); |
| 1181 | outb(LATCH >> 8, PIT_CH0); /* MSB */ |
| 1182 | udelay(10); |
| 1183 | spin_unlock_irqrestore(&i8253_lock, flags); |
| 1184 | #endif |
| 1185 | } |
| 1186 | |
| 1187 | static int suspend(int vetoable) |
| 1188 | { |
| 1189 | int err; |
| 1190 | struct apm_user *as; |
| 1191 | |
| 1192 | if (pm_send_all(PM_SUSPEND, (void *)3)) { |
| 1193 | /* Vetoed */ |
| 1194 | if (vetoable) { |
| 1195 | if (apm_info.connection_version > 0x100) |
| 1196 | set_system_power_state(APM_STATE_REJECT); |
| 1197 | err = -EBUSY; |
| 1198 | ignore_sys_suspend = 0; |
| 1199 | printk(KERN_WARNING "apm: suspend was vetoed.\n"); |
| 1200 | goto out; |
| 1201 | } |
| 1202 | printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n"); |
| 1203 | } |
| 1204 | |
| 1205 | device_suspend(PMSG_SUSPEND); |
| 1206 | local_irq_disable(); |
| 1207 | device_power_down(PMSG_SUSPEND); |
| 1208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | local_irq_enable(); |
| 1210 | |
| 1211 | save_processor_state(); |
| 1212 | err = set_system_power_state(APM_STATE_SUSPEND); |
Thomas Hood | 92c6dc5 | 2005-06-13 22:58:04 -0700 | [diff] [blame] | 1213 | ignore_normal_resume = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | restore_processor_state(); |
| 1215 | |
| 1216 | local_irq_disable(); |
john stultz | c7f40ff1 | 2006-09-25 23:32:35 -0700 | [diff] [blame] | 1217 | reinit_timer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | |
| 1219 | if (err == APM_NO_ERROR) |
| 1220 | err = APM_SUCCESS; |
| 1221 | if (err != APM_SUCCESS) |
| 1222 | apm_error("suspend", err); |
| 1223 | err = (err == APM_SUCCESS) ? 0 : -EIO; |
| 1224 | device_power_up(); |
| 1225 | local_irq_enable(); |
| 1226 | device_resume(); |
| 1227 | pm_send_all(PM_RESUME, (void *)0); |
| 1228 | queue_event(APM_NORMAL_RESUME, NULL); |
| 1229 | out: |
| 1230 | spin_lock(&user_list_lock); |
| 1231 | for (as = user_list; as != NULL; as = as->next) { |
| 1232 | as->suspend_wait = 0; |
| 1233 | as->suspend_result = err; |
| 1234 | } |
| 1235 | spin_unlock(&user_list_lock); |
| 1236 | wake_up_interruptible(&apm_suspend_waitqueue); |
| 1237 | return err; |
| 1238 | } |
| 1239 | |
| 1240 | static void standby(void) |
| 1241 | { |
| 1242 | int err; |
| 1243 | |
| 1244 | local_irq_disable(); |
| 1245 | device_power_down(PMSG_SUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | local_irq_enable(); |
| 1247 | |
| 1248 | err = set_system_power_state(APM_STATE_STANDBY); |
| 1249 | if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) |
| 1250 | apm_error("standby", err); |
| 1251 | |
| 1252 | local_irq_disable(); |
| 1253 | device_power_up(); |
| 1254 | local_irq_enable(); |
| 1255 | } |
| 1256 | |
| 1257 | static apm_event_t get_event(void) |
| 1258 | { |
| 1259 | int error; |
Andreas Mohr | 87af2ff | 2006-06-23 02:04:17 -0700 | [diff] [blame] | 1260 | apm_event_t event = APM_NO_EVENTS; /* silence gcc */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | apm_eventinfo_t info; |
| 1262 | |
| 1263 | static int notified; |
| 1264 | |
| 1265 | /* we don't use the eventinfo */ |
| 1266 | error = apm_get_event(&event, &info); |
| 1267 | if (error == APM_SUCCESS) |
| 1268 | return event; |
| 1269 | |
| 1270 | if ((error != APM_NO_EVENTS) && (notified++ == 0)) |
| 1271 | apm_error("get_event", error); |
| 1272 | |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
| 1276 | static void check_events(void) |
| 1277 | { |
| 1278 | apm_event_t event; |
| 1279 | static unsigned long last_resume; |
| 1280 | static int ignore_bounce; |
| 1281 | |
| 1282 | while ((event = get_event()) != 0) { |
| 1283 | if (debug) { |
| 1284 | if (event <= NR_APM_EVENT_NAME) |
| 1285 | printk(KERN_DEBUG "apm: received %s notify\n", |
| 1286 | apm_event_name[event - 1]); |
| 1287 | else |
| 1288 | printk(KERN_DEBUG "apm: received unknown " |
| 1289 | "event 0x%02x\n", event); |
| 1290 | } |
| 1291 | if (ignore_bounce |
| 1292 | && ((jiffies - last_resume) > bounce_interval)) |
| 1293 | ignore_bounce = 0; |
| 1294 | |
| 1295 | switch (event) { |
| 1296 | case APM_SYS_STANDBY: |
| 1297 | case APM_USER_STANDBY: |
| 1298 | queue_event(event, NULL); |
| 1299 | if (standbys_pending <= 0) |
| 1300 | standby(); |
| 1301 | break; |
| 1302 | |
| 1303 | case APM_USER_SUSPEND: |
| 1304 | #ifdef CONFIG_APM_IGNORE_USER_SUSPEND |
| 1305 | if (apm_info.connection_version > 0x100) |
| 1306 | set_system_power_state(APM_STATE_REJECT); |
| 1307 | break; |
| 1308 | #endif |
| 1309 | case APM_SYS_SUSPEND: |
| 1310 | if (ignore_bounce) { |
| 1311 | if (apm_info.connection_version > 0x100) |
| 1312 | set_system_power_state(APM_STATE_REJECT); |
| 1313 | break; |
| 1314 | } |
| 1315 | /* |
| 1316 | * If we are already processing a SUSPEND, |
| 1317 | * then further SUSPEND events from the BIOS |
| 1318 | * will be ignored. We also return here to |
| 1319 | * cope with the fact that the Thinkpads keep |
| 1320 | * sending a SUSPEND event until something else |
| 1321 | * happens! |
| 1322 | */ |
| 1323 | if (ignore_sys_suspend) |
| 1324 | return; |
| 1325 | ignore_sys_suspend = 1; |
| 1326 | queue_event(event, NULL); |
| 1327 | if (suspends_pending <= 0) |
| 1328 | (void) suspend(1); |
| 1329 | break; |
| 1330 | |
| 1331 | case APM_NORMAL_RESUME: |
| 1332 | case APM_CRITICAL_RESUME: |
| 1333 | case APM_STANDBY_RESUME: |
| 1334 | ignore_sys_suspend = 0; |
| 1335 | last_resume = jiffies; |
| 1336 | ignore_bounce = 1; |
| 1337 | if ((event != APM_NORMAL_RESUME) |
| 1338 | || (ignore_normal_resume == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | device_resume(); |
| 1340 | pm_send_all(PM_RESUME, (void *)0); |
| 1341 | queue_event(event, NULL); |
| 1342 | } |
| 1343 | ignore_normal_resume = 0; |
| 1344 | break; |
| 1345 | |
| 1346 | case APM_CAPABILITY_CHANGE: |
| 1347 | case APM_LOW_BATTERY: |
| 1348 | case APM_POWER_STATUS_CHANGE: |
| 1349 | queue_event(event, NULL); |
| 1350 | /* If needed, notify drivers here */ |
| 1351 | break; |
| 1352 | |
| 1353 | case APM_UPDATE_TIME: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | break; |
| 1355 | |
| 1356 | case APM_CRITICAL_SUSPEND: |
| 1357 | /* |
| 1358 | * We are not allowed to reject a critical suspend. |
| 1359 | */ |
| 1360 | (void) suspend(0); |
| 1361 | break; |
| 1362 | } |
| 1363 | } |
| 1364 | } |
| 1365 | |
| 1366 | static void apm_event_handler(void) |
| 1367 | { |
| 1368 | static int pending_count = 4; |
| 1369 | int err; |
| 1370 | |
| 1371 | if ((standbys_pending > 0) || (suspends_pending > 0)) { |
| 1372 | if ((apm_info.connection_version > 0x100) && |
| 1373 | (pending_count-- <= 0)) { |
| 1374 | pending_count = 4; |
| 1375 | if (debug) |
| 1376 | printk(KERN_DEBUG "apm: setting state busy\n"); |
| 1377 | err = set_system_power_state(APM_STATE_BUSY); |
| 1378 | if (err) |
| 1379 | apm_error("busy", err); |
| 1380 | } |
| 1381 | } else |
| 1382 | pending_count = 4; |
| 1383 | check_events(); |
| 1384 | } |
| 1385 | |
| 1386 | /* |
| 1387 | * This is the APM thread main loop. |
| 1388 | */ |
| 1389 | |
| 1390 | static void apm_mainloop(void) |
| 1391 | { |
| 1392 | DECLARE_WAITQUEUE(wait, current); |
| 1393 | |
| 1394 | add_wait_queue(&apm_waitqueue, &wait); |
| 1395 | set_current_state(TASK_INTERRUPTIBLE); |
| 1396 | for (;;) { |
| 1397 | schedule_timeout(APM_CHECK_TIMEOUT); |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 1398 | if (kthread_should_stop()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | break; |
| 1400 | /* |
| 1401 | * Ok, check all events, check for idle (and mark us sleeping |
| 1402 | * so as not to count towards the load average).. |
| 1403 | */ |
| 1404 | set_current_state(TASK_INTERRUPTIBLE); |
| 1405 | apm_event_handler(); |
| 1406 | } |
| 1407 | remove_wait_queue(&apm_waitqueue, &wait); |
| 1408 | } |
| 1409 | |
| 1410 | static int check_apm_user(struct apm_user *as, const char *func) |
| 1411 | { |
| 1412 | if ((as == NULL) || (as->magic != APM_BIOS_MAGIC)) { |
| 1413 | printk(KERN_ERR "apm: %s passed bad filp\n", func); |
| 1414 | return 1; |
| 1415 | } |
| 1416 | return 0; |
| 1417 | } |
| 1418 | |
| 1419 | static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) |
| 1420 | { |
| 1421 | struct apm_user * as; |
| 1422 | int i; |
| 1423 | apm_event_t event; |
| 1424 | |
| 1425 | as = fp->private_data; |
| 1426 | if (check_apm_user(as, "read")) |
| 1427 | return -EIO; |
| 1428 | if ((int)count < sizeof(apm_event_t)) |
| 1429 | return -EINVAL; |
| 1430 | if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) |
| 1431 | return -EAGAIN; |
| 1432 | wait_event_interruptible(apm_waitqueue, !queue_empty(as)); |
| 1433 | i = count; |
| 1434 | while ((i >= sizeof(event)) && !queue_empty(as)) { |
| 1435 | event = get_queued_event(as); |
| 1436 | if (copy_to_user(buf, &event, sizeof(event))) { |
| 1437 | if (i < count) |
| 1438 | break; |
| 1439 | return -EFAULT; |
| 1440 | } |
| 1441 | switch (event) { |
| 1442 | case APM_SYS_SUSPEND: |
| 1443 | case APM_USER_SUSPEND: |
| 1444 | as->suspends_read++; |
| 1445 | break; |
| 1446 | |
| 1447 | case APM_SYS_STANDBY: |
| 1448 | case APM_USER_STANDBY: |
| 1449 | as->standbys_read++; |
| 1450 | break; |
| 1451 | } |
| 1452 | buf += sizeof(event); |
| 1453 | i -= sizeof(event); |
| 1454 | } |
| 1455 | if (i < count) |
| 1456 | return count - i; |
| 1457 | if (signal_pending(current)) |
| 1458 | return -ERESTARTSYS; |
| 1459 | return 0; |
| 1460 | } |
| 1461 | |
| 1462 | static unsigned int do_poll(struct file *fp, poll_table * wait) |
| 1463 | { |
| 1464 | struct apm_user * as; |
| 1465 | |
| 1466 | as = fp->private_data; |
| 1467 | if (check_apm_user(as, "poll")) |
| 1468 | return 0; |
| 1469 | poll_wait(fp, &apm_waitqueue, wait); |
| 1470 | if (!queue_empty(as)) |
| 1471 | return POLLIN | POLLRDNORM; |
| 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | static int do_ioctl(struct inode * inode, struct file *filp, |
| 1476 | u_int cmd, u_long arg) |
| 1477 | { |
| 1478 | struct apm_user * as; |
| 1479 | |
| 1480 | as = filp->private_data; |
| 1481 | if (check_apm_user(as, "ioctl")) |
| 1482 | return -EIO; |
| 1483 | if ((!as->suser) || (!as->writer)) |
| 1484 | return -EPERM; |
| 1485 | switch (cmd) { |
| 1486 | case APM_IOC_STANDBY: |
| 1487 | if (as->standbys_read > 0) { |
| 1488 | as->standbys_read--; |
| 1489 | as->standbys_pending--; |
| 1490 | standbys_pending--; |
| 1491 | } else |
| 1492 | queue_event(APM_USER_STANDBY, as); |
| 1493 | if (standbys_pending <= 0) |
| 1494 | standby(); |
| 1495 | break; |
| 1496 | case APM_IOC_SUSPEND: |
| 1497 | if (as->suspends_read > 0) { |
| 1498 | as->suspends_read--; |
| 1499 | as->suspends_pending--; |
| 1500 | suspends_pending--; |
| 1501 | } else |
| 1502 | queue_event(APM_USER_SUSPEND, as); |
| 1503 | if (suspends_pending <= 0) { |
| 1504 | return suspend(1); |
| 1505 | } else { |
| 1506 | as->suspend_wait = 1; |
| 1507 | wait_event_interruptible(apm_suspend_waitqueue, |
| 1508 | as->suspend_wait == 0); |
| 1509 | return as->suspend_result; |
| 1510 | } |
| 1511 | break; |
| 1512 | default: |
| 1513 | return -EINVAL; |
| 1514 | } |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | static int do_release(struct inode * inode, struct file * filp) |
| 1519 | { |
| 1520 | struct apm_user * as; |
| 1521 | |
| 1522 | as = filp->private_data; |
| 1523 | if (check_apm_user(as, "release")) |
| 1524 | return 0; |
| 1525 | filp->private_data = NULL; |
| 1526 | if (as->standbys_pending > 0) { |
| 1527 | standbys_pending -= as->standbys_pending; |
| 1528 | if (standbys_pending <= 0) |
| 1529 | standby(); |
| 1530 | } |
| 1531 | if (as->suspends_pending > 0) { |
| 1532 | suspends_pending -= as->suspends_pending; |
| 1533 | if (suspends_pending <= 0) |
| 1534 | (void) suspend(1); |
| 1535 | } |
| 1536 | spin_lock(&user_list_lock); |
| 1537 | if (user_list == as) |
| 1538 | user_list = as->next; |
| 1539 | else { |
| 1540 | struct apm_user * as1; |
| 1541 | |
| 1542 | for (as1 = user_list; |
| 1543 | (as1 != NULL) && (as1->next != as); |
| 1544 | as1 = as1->next) |
| 1545 | ; |
| 1546 | if (as1 == NULL) |
| 1547 | printk(KERN_ERR "apm: filp not in user list\n"); |
| 1548 | else |
| 1549 | as1->next = as->next; |
| 1550 | } |
| 1551 | spin_unlock(&user_list_lock); |
| 1552 | kfree(as); |
| 1553 | return 0; |
| 1554 | } |
| 1555 | |
| 1556 | static int do_open(struct inode * inode, struct file * filp) |
| 1557 | { |
| 1558 | struct apm_user * as; |
| 1559 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 1560 | as = kmalloc(sizeof(*as), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | if (as == NULL) { |
| 1562 | printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", |
| 1563 | sizeof(*as)); |
| 1564 | return -ENOMEM; |
| 1565 | } |
| 1566 | as->magic = APM_BIOS_MAGIC; |
| 1567 | as->event_tail = as->event_head = 0; |
| 1568 | as->suspends_pending = as->standbys_pending = 0; |
| 1569 | as->suspends_read = as->standbys_read = 0; |
| 1570 | /* |
| 1571 | * XXX - this is a tiny bit broken, when we consider BSD |
| 1572 | * process accounting. If the device is opened by root, we |
| 1573 | * instantly flag that we used superuser privs. Who knows, |
| 1574 | * we might close the device immediately without doing a |
| 1575 | * privileged operation -- cevans |
| 1576 | */ |
| 1577 | as->suser = capable(CAP_SYS_ADMIN); |
| 1578 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; |
| 1579 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; |
| 1580 | spin_lock(&user_list_lock); |
| 1581 | as->next = user_list; |
| 1582 | user_list = as; |
| 1583 | spin_unlock(&user_list_lock); |
| 1584 | filp->private_data = as; |
| 1585 | return 0; |
| 1586 | } |
| 1587 | |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 1588 | static int proc_apm_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | unsigned short bx; |
| 1591 | unsigned short cx; |
| 1592 | unsigned short dx; |
| 1593 | int error; |
| 1594 | unsigned short ac_line_status = 0xff; |
| 1595 | unsigned short battery_status = 0xff; |
| 1596 | unsigned short battery_flag = 0xff; |
| 1597 | int percentage = -1; |
| 1598 | int time_units = -1; |
| 1599 | char *units = "?"; |
| 1600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | if ((num_online_cpus() == 1) && |
| 1602 | !(error = apm_get_power_status(&bx, &cx, &dx))) { |
| 1603 | ac_line_status = (bx >> 8) & 0xff; |
| 1604 | battery_status = bx & 0xff; |
| 1605 | if ((cx & 0xff) != 0xff) |
| 1606 | percentage = cx & 0xff; |
| 1607 | |
| 1608 | if (apm_info.connection_version > 0x100) { |
| 1609 | battery_flag = (cx >> 8) & 0xff; |
| 1610 | if (dx != 0xffff) { |
| 1611 | units = (dx & 0x8000) ? "min" : "sec"; |
| 1612 | time_units = dx & 0x7fff; |
| 1613 | } |
| 1614 | } |
| 1615 | } |
| 1616 | /* Arguments, with symbols from linux/apm_bios.h. Information is |
| 1617 | from the Get Power Status (0x0a) call unless otherwise noted. |
| 1618 | |
| 1619 | 0) Linux driver version (this will change if format changes) |
| 1620 | 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. |
| 1621 | 2) APM flags from APM Installation Check (0x00): |
| 1622 | bit 0: APM_16_BIT_SUPPORT |
| 1623 | bit 1: APM_32_BIT_SUPPORT |
| 1624 | bit 2: APM_IDLE_SLOWS_CLOCK |
| 1625 | bit 3: APM_BIOS_DISABLED |
| 1626 | bit 4: APM_BIOS_DISENGAGED |
| 1627 | 3) AC line status |
| 1628 | 0x00: Off-line |
| 1629 | 0x01: On-line |
| 1630 | 0x02: On backup power (BIOS >= 1.1 only) |
| 1631 | 0xff: Unknown |
| 1632 | 4) Battery status |
| 1633 | 0x00: High |
| 1634 | 0x01: Low |
| 1635 | 0x02: Critical |
| 1636 | 0x03: Charging |
| 1637 | 0x04: Selected battery not present (BIOS >= 1.2 only) |
| 1638 | 0xff: Unknown |
| 1639 | 5) Battery flag |
| 1640 | bit 0: High |
| 1641 | bit 1: Low |
| 1642 | bit 2: Critical |
| 1643 | bit 3: Charging |
| 1644 | bit 7: No system battery |
| 1645 | 0xff: Unknown |
| 1646 | 6) Remaining battery life (percentage of charge): |
| 1647 | 0-100: valid |
| 1648 | -1: Unknown |
| 1649 | 7) Remaining battery life (time units): |
| 1650 | Number of remaining minutes or seconds |
| 1651 | -1: Unknown |
| 1652 | 8) min = minutes; sec = seconds */ |
| 1653 | |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 1654 | seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | driver_version, |
| 1656 | (apm_info.bios.version >> 8) & 0xff, |
| 1657 | apm_info.bios.version & 0xff, |
| 1658 | apm_info.bios.flags, |
| 1659 | ac_line_status, |
| 1660 | battery_status, |
| 1661 | battery_flag, |
| 1662 | percentage, |
| 1663 | time_units, |
| 1664 | units); |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 1665 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | } |
| 1667 | |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 1668 | static int proc_apm_open(struct inode *inode, struct file *file) |
| 1669 | { |
| 1670 | return single_open(file, proc_apm_show, NULL); |
| 1671 | } |
| 1672 | |
| 1673 | static const struct file_operations apm_file_ops = { |
| 1674 | .owner = THIS_MODULE, |
| 1675 | .open = proc_apm_open, |
| 1676 | .read = seq_read, |
| 1677 | .llseek = seq_lseek, |
| 1678 | .release = single_release, |
| 1679 | }; |
| 1680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | static int apm(void *unused) |
| 1682 | { |
| 1683 | unsigned short bx; |
| 1684 | unsigned short cx; |
| 1685 | unsigned short dx; |
| 1686 | int error; |
| 1687 | char * power_stat; |
| 1688 | char * bat_stat; |
| 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | #ifdef CONFIG_SMP |
| 1691 | /* 2002/08/01 - WT |
| 1692 | * This is to avoid random crashes at boot time during initialization |
| 1693 | * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. |
| 1694 | * Some bioses don't like being called from CPU != 0. |
| 1695 | * Method suggested by Ingo Molnar. |
| 1696 | */ |
| 1697 | set_cpus_allowed(current, cpumask_of_cpu(0)); |
| 1698 | BUG_ON(smp_processor_id() != 0); |
| 1699 | #endif |
| 1700 | |
| 1701 | if (apm_info.connection_version == 0) { |
| 1702 | apm_info.connection_version = apm_info.bios.version; |
| 1703 | if (apm_info.connection_version > 0x100) { |
| 1704 | /* |
| 1705 | * We only support BIOSs up to version 1.2 |
| 1706 | */ |
| 1707 | if (apm_info.connection_version > 0x0102) |
| 1708 | apm_info.connection_version = 0x0102; |
| 1709 | error = apm_driver_version(&apm_info.connection_version); |
| 1710 | if (error != APM_SUCCESS) { |
| 1711 | apm_error("driver version", error); |
| 1712 | /* Fall back to an APM 1.0 connection. */ |
| 1713 | apm_info.connection_version = 0x100; |
| 1714 | } |
| 1715 | } |
| 1716 | } |
| 1717 | |
| 1718 | if (debug) |
| 1719 | printk(KERN_INFO "apm: Connection version %d.%d\n", |
| 1720 | (apm_info.connection_version >> 8) & 0xff, |
| 1721 | apm_info.connection_version & 0xff); |
| 1722 | |
| 1723 | #ifdef CONFIG_APM_DO_ENABLE |
| 1724 | if (apm_info.bios.flags & APM_BIOS_DISABLED) { |
| 1725 | /* |
| 1726 | * This call causes my NEC UltraLite Versa 33/C to hang if it |
| 1727 | * is booted with PM disabled but not in the docking station. |
| 1728 | * Unfortunate ... |
| 1729 | */ |
| 1730 | error = apm_enable_power_management(1); |
| 1731 | if (error) { |
| 1732 | apm_error("enable power management", error); |
| 1733 | return -1; |
| 1734 | } |
| 1735 | } |
| 1736 | #endif |
| 1737 | |
| 1738 | if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) |
| 1739 | && (apm_info.connection_version > 0x0100)) { |
| 1740 | error = apm_engage_power_management(APM_DEVICE_ALL, 1); |
| 1741 | if (error) { |
| 1742 | apm_error("engage power management", error); |
| 1743 | return -1; |
| 1744 | } |
| 1745 | } |
| 1746 | |
| 1747 | if (debug && (num_online_cpus() == 1 || smp )) { |
| 1748 | error = apm_get_power_status(&bx, &cx, &dx); |
| 1749 | if (error) |
| 1750 | printk(KERN_INFO "apm: power status not available\n"); |
| 1751 | else { |
| 1752 | switch ((bx >> 8) & 0xff) { |
| 1753 | case 0: power_stat = "off line"; break; |
| 1754 | case 1: power_stat = "on line"; break; |
| 1755 | case 2: power_stat = "on backup power"; break; |
| 1756 | default: power_stat = "unknown"; break; |
| 1757 | } |
| 1758 | switch (bx & 0xff) { |
| 1759 | case 0: bat_stat = "high"; break; |
| 1760 | case 1: bat_stat = "low"; break; |
| 1761 | case 2: bat_stat = "critical"; break; |
| 1762 | case 3: bat_stat = "charging"; break; |
| 1763 | default: bat_stat = "unknown"; break; |
| 1764 | } |
| 1765 | printk(KERN_INFO |
| 1766 | "apm: AC %s, battery status %s, battery life ", |
| 1767 | power_stat, bat_stat); |
| 1768 | if ((cx & 0xff) == 0xff) |
| 1769 | printk("unknown\n"); |
| 1770 | else |
| 1771 | printk("%d%%\n", cx & 0xff); |
| 1772 | if (apm_info.connection_version > 0x100) { |
| 1773 | printk(KERN_INFO |
| 1774 | "apm: battery flag 0x%02x, battery life ", |
| 1775 | (cx >> 8) & 0xff); |
| 1776 | if (dx == 0xffff) |
| 1777 | printk("unknown\n"); |
| 1778 | else |
| 1779 | printk("%d %s\n", dx & 0x7fff, |
| 1780 | (dx & 0x8000) ? |
| 1781 | "minutes" : "seconds"); |
| 1782 | } |
| 1783 | } |
| 1784 | } |
| 1785 | |
| 1786 | /* Install our power off handler.. */ |
| 1787 | if (power_off) |
| 1788 | pm_power_off = apm_power_off; |
| 1789 | |
| 1790 | if (num_online_cpus() == 1 || smp) { |
| 1791 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
| 1792 | console_blank_hook = apm_console_blank; |
| 1793 | #endif |
| 1794 | apm_mainloop(); |
| 1795 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
| 1796 | console_blank_hook = NULL; |
| 1797 | #endif |
| 1798 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | |
| 1800 | return 0; |
| 1801 | } |
| 1802 | |
| 1803 | #ifndef MODULE |
| 1804 | static int __init apm_setup(char *str) |
| 1805 | { |
| 1806 | int invert; |
| 1807 | |
| 1808 | while ((str != NULL) && (*str != '\0')) { |
| 1809 | if (strncmp(str, "off", 3) == 0) |
| 1810 | apm_disabled = 1; |
| 1811 | if (strncmp(str, "on", 2) == 0) |
| 1812 | apm_disabled = 0; |
| 1813 | if ((strncmp(str, "bounce-interval=", 16) == 0) || |
| 1814 | (strncmp(str, "bounce_interval=", 16) == 0)) |
| 1815 | bounce_interval = simple_strtol(str + 16, NULL, 0); |
| 1816 | if ((strncmp(str, "idle-threshold=", 15) == 0) || |
| 1817 | (strncmp(str, "idle_threshold=", 15) == 0)) |
| 1818 | idle_threshold = simple_strtol(str + 15, NULL, 0); |
| 1819 | if ((strncmp(str, "idle-period=", 12) == 0) || |
| 1820 | (strncmp(str, "idle_period=", 12) == 0)) |
| 1821 | idle_period = simple_strtol(str + 12, NULL, 0); |
| 1822 | invert = (strncmp(str, "no-", 3) == 0) || |
| 1823 | (strncmp(str, "no_", 3) == 0); |
| 1824 | if (invert) |
| 1825 | str += 3; |
| 1826 | if (strncmp(str, "debug", 5) == 0) |
| 1827 | debug = !invert; |
| 1828 | if ((strncmp(str, "power-off", 9) == 0) || |
| 1829 | (strncmp(str, "power_off", 9) == 0)) |
| 1830 | power_off = !invert; |
| 1831 | if (strncmp(str, "smp", 3) == 0) |
| 1832 | { |
| 1833 | smp = !invert; |
| 1834 | idle_threshold = 100; |
| 1835 | } |
| 1836 | if ((strncmp(str, "allow-ints", 10) == 0) || |
| 1837 | (strncmp(str, "allow_ints", 10) == 0)) |
| 1838 | apm_info.allow_ints = !invert; |
| 1839 | if ((strncmp(str, "broken-psr", 10) == 0) || |
| 1840 | (strncmp(str, "broken_psr", 10) == 0)) |
| 1841 | apm_info.get_power_status_broken = !invert; |
| 1842 | if ((strncmp(str, "realmode-power-off", 18) == 0) || |
| 1843 | (strncmp(str, "realmode_power_off", 18) == 0)) |
| 1844 | apm_info.realmode_power_off = !invert; |
| 1845 | str = strchr(str, ','); |
| 1846 | if (str != NULL) |
| 1847 | str += strspn(str, ", \t"); |
| 1848 | } |
| 1849 | return 1; |
| 1850 | } |
| 1851 | |
| 1852 | __setup("apm=", apm_setup); |
| 1853 | #endif |
| 1854 | |
Arjan van de Ven | 5dfe4c9 | 2007-02-12 00:55:31 -0800 | [diff] [blame] | 1855 | static const struct file_operations apm_bios_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | .owner = THIS_MODULE, |
| 1857 | .read = do_read, |
| 1858 | .poll = do_poll, |
| 1859 | .ioctl = do_ioctl, |
| 1860 | .open = do_open, |
| 1861 | .release = do_release, |
| 1862 | }; |
| 1863 | |
| 1864 | static struct miscdevice apm_device = { |
| 1865 | APM_MINOR_DEV, |
| 1866 | "apm_bios", |
| 1867 | &apm_bios_fops |
| 1868 | }; |
| 1869 | |
| 1870 | |
| 1871 | /* Simple "print if true" callback */ |
| 1872 | static int __init print_if_true(struct dmi_system_id *d) |
| 1873 | { |
| 1874 | printk("%s\n", d->ident); |
| 1875 | return 0; |
| 1876 | } |
| 1877 | |
| 1878 | /* |
| 1879 | * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was |
| 1880 | * disabled before the suspend. Linux used to get terribly confused by that. |
| 1881 | */ |
| 1882 | static int __init broken_ps2_resume(struct dmi_system_id *d) |
| 1883 | { |
| 1884 | printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround hopefully not needed.\n", d->ident); |
| 1885 | return 0; |
| 1886 | } |
| 1887 | |
| 1888 | /* Some bioses have a broken protected mode poweroff and need to use realmode */ |
| 1889 | static int __init set_realmode_power_off(struct dmi_system_id *d) |
| 1890 | { |
| 1891 | if (apm_info.realmode_power_off == 0) { |
| 1892 | apm_info.realmode_power_off = 1; |
| 1893 | printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident); |
| 1894 | } |
| 1895 | return 0; |
| 1896 | } |
| 1897 | |
| 1898 | /* Some laptops require interrupts to be enabled during APM calls */ |
| 1899 | static int __init set_apm_ints(struct dmi_system_id *d) |
| 1900 | { |
| 1901 | if (apm_info.allow_ints == 0) { |
| 1902 | apm_info.allow_ints = 1; |
| 1903 | printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident); |
| 1904 | } |
| 1905 | return 0; |
| 1906 | } |
| 1907 | |
| 1908 | /* Some APM bioses corrupt memory or just plain do not work */ |
| 1909 | static int __init apm_is_horked(struct dmi_system_id *d) |
| 1910 | { |
| 1911 | if (apm_info.disabled == 0) { |
| 1912 | apm_info.disabled = 1; |
| 1913 | printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident); |
| 1914 | } |
| 1915 | return 0; |
| 1916 | } |
| 1917 | |
| 1918 | static int __init apm_is_horked_d850md(struct dmi_system_id *d) |
| 1919 | { |
| 1920 | if (apm_info.disabled == 0) { |
| 1921 | apm_info.disabled = 1; |
| 1922 | printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident); |
| 1923 | printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n"); |
| 1924 | printk(KERN_INFO "download from support.intel.com \n"); |
| 1925 | } |
| 1926 | return 0; |
| 1927 | } |
| 1928 | |
| 1929 | /* Some APM bioses hang on APM idle calls */ |
| 1930 | static int __init apm_likes_to_melt(struct dmi_system_id *d) |
| 1931 | { |
| 1932 | if (apm_info.forbid_idle == 0) { |
| 1933 | apm_info.forbid_idle = 1; |
| 1934 | printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident); |
| 1935 | } |
| 1936 | return 0; |
| 1937 | } |
| 1938 | |
| 1939 | /* |
| 1940 | * Check for clue free BIOS implementations who use |
| 1941 | * the following QA technique |
| 1942 | * |
| 1943 | * [ Write BIOS Code ]<------ |
| 1944 | * | ^ |
| 1945 | * < Does it Compile >----N-- |
| 1946 | * |Y ^ |
| 1947 | * < Does it Boot Win98 >-N-- |
| 1948 | * |Y |
| 1949 | * [Ship It] |
| 1950 | * |
| 1951 | * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) |
| 1952 | * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) |
| 1953 | */ |
| 1954 | static int __init broken_apm_power(struct dmi_system_id *d) |
| 1955 | { |
| 1956 | apm_info.get_power_status_broken = 1; |
| 1957 | printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n"); |
| 1958 | return 0; |
| 1959 | } |
| 1960 | |
| 1961 | /* |
| 1962 | * This bios swaps the APM minute reporting bytes over (Many sony laptops |
| 1963 | * have this problem). |
| 1964 | */ |
| 1965 | static int __init swab_apm_power_in_minutes(struct dmi_system_id *d) |
| 1966 | { |
| 1967 | apm_info.get_power_status_swabinminutes = 1; |
| 1968 | printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n"); |
| 1969 | return 0; |
| 1970 | } |
| 1971 | |
| 1972 | static struct dmi_system_id __initdata apm_dmi_table[] = { |
| 1973 | { |
| 1974 | print_if_true, |
| 1975 | KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", |
| 1976 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), |
| 1977 | DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, |
| 1978 | }, |
| 1979 | { /* Handle problems with APM on the C600 */ |
| 1980 | broken_ps2_resume, "Dell Latitude C600", |
| 1981 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
| 1982 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, |
| 1983 | }, |
| 1984 | { /* Allow interrupts during suspend on Dell Latitude laptops*/ |
| 1985 | set_apm_ints, "Dell Latitude", |
| 1986 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| 1987 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } |
| 1988 | }, |
| 1989 | { /* APM crashes */ |
| 1990 | apm_is_horked, "Dell Inspiron 2500", |
| 1991 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| 1992 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), |
| 1993 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 1994 | DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, |
| 1995 | }, |
| 1996 | { /* Allow interrupts during suspend on Dell Inspiron laptops*/ |
| 1997 | set_apm_ints, "Dell Inspiron", { |
| 1998 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| 1999 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, |
| 2000 | }, |
| 2001 | { /* Handle problems with APM on Inspiron 5000e */ |
| 2002 | broken_apm_power, "Dell Inspiron 5000e", |
| 2003 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2004 | DMI_MATCH(DMI_BIOS_VERSION, "A04"), |
| 2005 | DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, |
| 2006 | }, |
| 2007 | { /* Handle problems with APM on Inspiron 2500 */ |
| 2008 | broken_apm_power, "Dell Inspiron 2500", |
| 2009 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2010 | DMI_MATCH(DMI_BIOS_VERSION, "A12"), |
| 2011 | DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, |
| 2012 | }, |
| 2013 | { /* APM crashes */ |
| 2014 | apm_is_horked, "Dell Dimension 4100", |
| 2015 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| 2016 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), |
| 2017 | DMI_MATCH(DMI_BIOS_VENDOR,"Intel Corp."), |
| 2018 | DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, |
| 2019 | }, |
| 2020 | { /* Allow interrupts during suspend on Compaq Laptops*/ |
| 2021 | set_apm_ints, "Compaq 12XL125", |
| 2022 | { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), |
| 2023 | DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), |
| 2024 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2025 | DMI_MATCH(DMI_BIOS_VERSION,"4.06"), }, |
| 2026 | }, |
| 2027 | { /* Allow interrupts during APM or the clock goes slow */ |
| 2028 | set_apm_ints, "ASUSTeK", |
| 2029 | { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| 2030 | DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, |
| 2031 | }, |
| 2032 | { /* APM blows on shutdown */ |
| 2033 | apm_is_horked, "ABIT KX7-333[R]", |
| 2034 | { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), |
| 2035 | DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, |
| 2036 | }, |
| 2037 | { /* APM crashes */ |
| 2038 | apm_is_horked, "Trigem Delhi3", |
| 2039 | { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), |
| 2040 | DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, |
| 2041 | }, |
| 2042 | { /* APM crashes */ |
| 2043 | apm_is_horked, "Fujitsu-Siemens", |
| 2044 | { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), |
| 2045 | DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, |
| 2046 | }, |
| 2047 | { /* APM crashes */ |
| 2048 | apm_is_horked_d850md, "Intel D850MD", |
| 2049 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), |
| 2050 | DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, |
| 2051 | }, |
| 2052 | { /* APM crashes */ |
| 2053 | apm_is_horked, "Intel D810EMO", |
| 2054 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), |
| 2055 | DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, |
| 2056 | }, |
| 2057 | { /* APM crashes */ |
| 2058 | apm_is_horked, "Dell XPS-Z", |
| 2059 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), |
| 2060 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), |
| 2061 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, |
| 2062 | }, |
| 2063 | { /* APM crashes */ |
| 2064 | apm_is_horked, "Sharp PC-PJ/AX", |
| 2065 | { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), |
| 2066 | DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), |
| 2067 | DMI_MATCH(DMI_BIOS_VENDOR,"SystemSoft"), |
| 2068 | DMI_MATCH(DMI_BIOS_VERSION,"Version R2.08"), }, |
| 2069 | }, |
| 2070 | { /* APM crashes */ |
| 2071 | apm_is_horked, "Dell Inspiron 2500", |
| 2072 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| 2073 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), |
| 2074 | DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), |
| 2075 | DMI_MATCH(DMI_BIOS_VERSION,"A11"), }, |
| 2076 | }, |
| 2077 | { /* APM idle hangs */ |
| 2078 | apm_likes_to_melt, "Jabil AMD", |
| 2079 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), |
| 2080 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, |
| 2081 | }, |
| 2082 | { /* APM idle hangs */ |
| 2083 | apm_likes_to_melt, "AMI Bios", |
| 2084 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), |
| 2085 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, |
| 2086 | }, |
| 2087 | { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ |
| 2088 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2089 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2090 | DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), |
| 2091 | DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, |
| 2092 | }, |
| 2093 | { /* Handle problems with APM on Sony Vaio PCG-N505VX */ |
| 2094 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2095 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2096 | DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), |
| 2097 | DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, |
| 2098 | }, |
| 2099 | { /* Handle problems with APM on Sony Vaio PCG-XG29 */ |
| 2100 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2101 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2102 | DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), |
| 2103 | DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, |
| 2104 | }, |
| 2105 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ |
| 2106 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2107 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2108 | DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), |
| 2109 | DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, |
| 2110 | }, |
| 2111 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ |
| 2112 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2113 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2114 | DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), |
| 2115 | DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, |
| 2116 | }, |
| 2117 | { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ |
| 2118 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2119 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2120 | DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), |
| 2121 | DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, |
| 2122 | }, |
| 2123 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ |
| 2124 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2125 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2126 | DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), |
| 2127 | DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, |
| 2128 | }, |
| 2129 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ |
| 2130 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2131 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2132 | DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), |
| 2133 | DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, |
| 2134 | }, |
| 2135 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ |
| 2136 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2137 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2138 | DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), |
| 2139 | DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, |
| 2140 | }, |
| 2141 | { /* Handle problems with APM on Sony Vaio PCG-F104K */ |
| 2142 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2143 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2144 | DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), |
| 2145 | DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, |
| 2146 | }, |
| 2147 | |
| 2148 | { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ |
| 2149 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2150 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2151 | DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), |
| 2152 | DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, |
| 2153 | }, |
| 2154 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ |
| 2155 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2156 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2157 | DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), |
| 2158 | DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, |
| 2159 | }, |
| 2160 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ |
| 2161 | swab_apm_power_in_minutes, "Sony VAIO", |
| 2162 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 2163 | DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), |
| 2164 | DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, |
| 2165 | }, |
| 2166 | { /* broken PM poweroff bios */ |
| 2167 | set_realmode_power_off, "Award Software v4.60 PGMA", |
| 2168 | { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), |
| 2169 | DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), |
| 2170 | DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, |
| 2171 | }, |
| 2172 | |
| 2173 | /* Generic per vendor APM settings */ |
| 2174 | |
| 2175 | { /* Allow interrupts during suspend on IBM laptops */ |
| 2176 | set_apm_ints, "IBM", |
| 2177 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, |
| 2178 | }, |
| 2179 | |
| 2180 | { } |
| 2181 | }; |
| 2182 | |
| 2183 | /* |
| 2184 | * Just start the APM thread. We do NOT want to do APM BIOS |
| 2185 | * calls from anything but the APM thread, if for no other reason |
| 2186 | * than the fact that we don't trust the APM BIOS. This way, |
| 2187 | * most common APM BIOS problems that lead to protection errors |
| 2188 | * etc will have at least some level of being contained... |
| 2189 | * |
| 2190 | * In short, if something bad happens, at least we have a choice |
| 2191 | * of just killing the apm thread.. |
| 2192 | */ |
| 2193 | static int __init apm_init(void) |
| 2194 | { |
| 2195 | struct proc_dir_entry *apm_proc; |
Zachary Amsden | 92f17f0 | 2006-01-06 00:11:58 -0800 | [diff] [blame] | 2196 | struct desc_struct *gdt; |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 2197 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
| 2199 | dmi_check_system(apm_dmi_table); |
| 2200 | |
Rusty Russell | 6020c8f | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 2201 | if (apm_info.bios.version == 0 || paravirt_enabled()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | printk(KERN_INFO "apm: BIOS not found.\n"); |
| 2203 | return -ENODEV; |
| 2204 | } |
| 2205 | printk(KERN_INFO |
| 2206 | "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", |
| 2207 | ((apm_info.bios.version >> 8) & 0xff), |
| 2208 | (apm_info.bios.version & 0xff), |
| 2209 | apm_info.bios.flags, |
| 2210 | driver_version); |
| 2211 | if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { |
| 2212 | printk(KERN_INFO "apm: no 32 bit BIOS support\n"); |
| 2213 | return -ENODEV; |
| 2214 | } |
| 2215 | |
| 2216 | if (allow_ints) |
| 2217 | apm_info.allow_ints = 1; |
| 2218 | if (broken_psr) |
| 2219 | apm_info.get_power_status_broken = 1; |
| 2220 | if (realmode_power_off) |
| 2221 | apm_info.realmode_power_off = 1; |
| 2222 | /* User can override, but default is to trust DMI */ |
| 2223 | if (apm_disabled != -1) |
| 2224 | apm_info.disabled = apm_disabled; |
| 2225 | |
| 2226 | /* |
| 2227 | * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 |
| 2228 | * but is reportedly a 1.0 BIOS. |
| 2229 | */ |
| 2230 | if (apm_info.bios.version == 0x001) |
| 2231 | apm_info.bios.version = 0x100; |
| 2232 | |
| 2233 | /* BIOS < 1.2 doesn't set cseg_16_len */ |
| 2234 | if (apm_info.bios.version < 0x102) |
| 2235 | apm_info.bios.cseg_16_len = 0; /* 64k */ |
| 2236 | |
| 2237 | if (debug) { |
| 2238 | printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x", |
| 2239 | apm_info.bios.cseg, apm_info.bios.offset, |
| 2240 | apm_info.bios.cseg_16, apm_info.bios.dseg); |
| 2241 | if (apm_info.bios.version > 0x100) |
| 2242 | printk(" cseg len %x, dseg len %x", |
| 2243 | apm_info.bios.cseg_len, |
| 2244 | apm_info.bios.dseg_len); |
| 2245 | if (apm_info.bios.version > 0x101) |
| 2246 | printk(" cseg16 len %x", apm_info.bios.cseg_16_len); |
| 2247 | printk("\n"); |
| 2248 | } |
| 2249 | |
| 2250 | if (apm_info.disabled) { |
| 2251 | printk(KERN_NOTICE "apm: disabled on user request.\n"); |
| 2252 | return -ENODEV; |
| 2253 | } |
| 2254 | if ((num_online_cpus() > 1) && !power_off && !smp) { |
| 2255 | printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n"); |
| 2256 | apm_info.disabled = 1; |
| 2257 | return -ENODEV; |
| 2258 | } |
| 2259 | if (PM_IS_ACTIVE()) { |
| 2260 | printk(KERN_NOTICE "apm: overridden by ACPI.\n"); |
| 2261 | apm_info.disabled = 1; |
| 2262 | return -ENODEV; |
| 2263 | } |
Dave Jones | 987d4613 | 2006-01-08 01:05:09 -0800 | [diff] [blame] | 2264 | #ifdef CONFIG_PM_LEGACY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | pm_active = 1; |
Dave Jones | 987d4613 | 2006-01-08 01:05:09 -0800 | [diff] [blame] | 2266 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | |
| 2268 | /* |
| 2269 | * Set up a segment that references the real mode segment 0x40 |
| 2270 | * that extends up to the end of page zero (that we have reserved). |
| 2271 | * This is for buggy BIOS's that refer to (real mode) segment 0x40 |
| 2272 | * even though they are called in protected mode. |
| 2273 | */ |
| 2274 | set_base(bad_bios_desc, __va((unsigned long)0x40 << 4)); |
| 2275 | _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4)); |
| 2276 | |
Zachary Amsden | 3012d2d | 2006-01-06 00:11:53 -0800 | [diff] [blame] | 2277 | /* |
| 2278 | * Set up the long jump entry point to the APM BIOS, which is called |
| 2279 | * from inline assembly. |
| 2280 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | apm_bios_entry.offset = apm_info.bios.offset; |
| 2282 | apm_bios_entry.segment = APM_CS; |
| 2283 | |
Zachary Amsden | 3012d2d | 2006-01-06 00:11:53 -0800 | [diff] [blame] | 2284 | /* |
| 2285 | * The APM 1.1 BIOS is supposed to provide limit information that it |
| 2286 | * recognizes. Many machines do this correctly, but many others do |
| 2287 | * not restrict themselves to their claimed limit. When this happens, |
| 2288 | * they will cause a segmentation violation in the kernel at boot time. |
| 2289 | * Most BIOS's, however, will respect a 64k limit, so we use that. |
Zachary Amsden | 92f17f0 | 2006-01-06 00:11:58 -0800 | [diff] [blame] | 2290 | * |
| 2291 | * Note we only set APM segments on CPU zero, since we pin the APM |
| 2292 | * code to that CPU. |
Zachary Amsden | 3012d2d | 2006-01-06 00:11:53 -0800 | [diff] [blame] | 2293 | */ |
Zachary Amsden | 92f17f0 | 2006-01-06 00:11:58 -0800 | [diff] [blame] | 2294 | gdt = get_cpu_gdt_table(0); |
| 2295 | set_base(gdt[APM_CS >> 3], |
| 2296 | __va((unsigned long)apm_info.bios.cseg << 4)); |
| 2297 | set_base(gdt[APM_CS_16 >> 3], |
| 2298 | __va((unsigned long)apm_info.bios.cseg_16 << 4)); |
| 2299 | set_base(gdt[APM_DS >> 3], |
| 2300 | __va((unsigned long)apm_info.bios.dseg << 4)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 2302 | apm_proc = create_proc_entry("apm", 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | if (apm_proc) |
Alexey Dobriyan | 016d6f3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 2304 | apm_proc->proc_fops = &apm_file_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 2306 | kapmd_task = kthread_create(apm, NULL, "kapmd"); |
| 2307 | if (IS_ERR(kapmd_task)) { |
| 2308 | printk(KERN_ERR "apm: disabled - Unable to start kernel " |
| 2309 | "thread.\n"); |
| 2310 | err = PTR_ERR(kapmd_task); |
| 2311 | kapmd_task = NULL; |
Neil Horman | c94a62a | 2006-09-25 23:32:21 -0700 | [diff] [blame] | 2312 | remove_proc_entry("apm", NULL); |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 2313 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | } |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 2315 | wake_up_process(kapmd_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | |
| 2317 | if (num_online_cpus() > 1 && !smp ) { |
| 2318 | printk(KERN_NOTICE |
| 2319 | "apm: disabled - APM is not SMP safe (power off active).\n"); |
| 2320 | return 0; |
| 2321 | } |
| 2322 | |
Neil Horman | c94a62a | 2006-09-25 23:32:21 -0700 | [diff] [blame] | 2323 | /* |
| 2324 | * Note we don't actually care if the misc_device cannot be registered. |
| 2325 | * this driver can do its job without it, even if userspace can't |
| 2326 | * control it. just log the error |
| 2327 | */ |
| 2328 | if (misc_register(&apm_device)) |
| 2329 | printk(KERN_WARNING "apm: Could not register misc device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | |
| 2331 | if (HZ != 100) |
| 2332 | idle_period = (idle_period * HZ) / 100; |
| 2333 | if (idle_threshold < 100) { |
| 2334 | original_pm_idle = pm_idle; |
| 2335 | pm_idle = apm_cpu_idle; |
| 2336 | set_pm_idle = 1; |
| 2337 | } |
| 2338 | |
| 2339 | return 0; |
| 2340 | } |
| 2341 | |
| 2342 | static void __exit apm_exit(void) |
| 2343 | { |
| 2344 | int error; |
| 2345 | |
| 2346 | if (set_pm_idle) { |
| 2347 | pm_idle = original_pm_idle; |
| 2348 | /* |
| 2349 | * We are about to unload the current idle thread pm callback |
| 2350 | * (pm_idle), Wait for all processors to update cached/local |
| 2351 | * copies of pm_idle before proceeding. |
| 2352 | */ |
| 2353 | cpu_idle_wait(); |
| 2354 | } |
| 2355 | if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) |
| 2356 | && (apm_info.connection_version > 0x0100)) { |
| 2357 | error = apm_engage_power_management(APM_DEVICE_ALL, 0); |
| 2358 | if (error) |
| 2359 | apm_error("disengage power management", error); |
| 2360 | } |
| 2361 | misc_deregister(&apm_device); |
| 2362 | remove_proc_entry("apm", NULL); |
| 2363 | if (power_off) |
| 2364 | pm_power_off = NULL; |
Serge E. Hallyn | fc09561 | 2006-09-29 02:00:04 -0700 | [diff] [blame] | 2365 | if (kapmd_task) { |
| 2366 | kthread_stop(kapmd_task); |
| 2367 | kapmd_task = NULL; |
| 2368 | } |
Dave Jones | 987d4613 | 2006-01-08 01:05:09 -0800 | [diff] [blame] | 2369 | #ifdef CONFIG_PM_LEGACY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | pm_active = 0; |
Dave Jones | 987d4613 | 2006-01-08 01:05:09 -0800 | [diff] [blame] | 2371 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | } |
| 2373 | |
| 2374 | module_init(apm_init); |
| 2375 | module_exit(apm_exit); |
| 2376 | |
| 2377 | MODULE_AUTHOR("Stephen Rothwell"); |
| 2378 | MODULE_DESCRIPTION("Advanced Power Management"); |
| 2379 | MODULE_LICENSE("GPL"); |
| 2380 | module_param(debug, bool, 0644); |
| 2381 | MODULE_PARM_DESC(debug, "Enable debug mode"); |
| 2382 | module_param(power_off, bool, 0444); |
| 2383 | MODULE_PARM_DESC(power_off, "Enable power off"); |
| 2384 | module_param(bounce_interval, int, 0444); |
| 2385 | MODULE_PARM_DESC(bounce_interval, |
| 2386 | "Set the number of ticks to ignore suspend bounces"); |
| 2387 | module_param(allow_ints, bool, 0444); |
| 2388 | MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); |
| 2389 | module_param(broken_psr, bool, 0444); |
| 2390 | MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); |
| 2391 | module_param(realmode_power_off, bool, 0444); |
| 2392 | MODULE_PARM_DESC(realmode_power_off, |
| 2393 | "Switch to real mode before powering off"); |
| 2394 | module_param(idle_threshold, int, 0444); |
| 2395 | MODULE_PARM_DESC(idle_threshold, |
| 2396 | "System idle percentage above which to make APM BIOS idle calls"); |
| 2397 | module_param(idle_period, int, 0444); |
| 2398 | MODULE_PARM_DESC(idle_period, |
| 2399 | "Period (in sec/100) over which to caculate the idle percentage"); |
| 2400 | module_param(smp, bool, 0444); |
| 2401 | MODULE_PARM_DESC(smp, |
| 2402 | "Set this to enable APM use on an SMP platform. Use with caution on older systems"); |
| 2403 | MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); |