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1da177e4 LT |
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. | |
27b46d76 | 60 | * The new replacement for it is, but Linux doesn't yet support this. |
1da177e4 LT |
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 | |
0d2eb44f | 69 | * 1.6: Cope with compiler/assembler differences. |
1da177e4 LT |
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. | |
a2531293 | 143 | * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz> |
1da177e4 LT |
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 | |
87c6fe26 | 163 | * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). |
1da177e4 | 164 | * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin |
87c6fe26 | 165 | * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) |
1da177e4 LT |
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 | |
50a23e6e JM |
192 | * 916.356.6100) or 800.548.4725; or from |
193 | * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also | |
1da177e4 LT |
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: | |
3f4b23e9 | 201 | * http://www.microsoft.com/whdc/archive/amp_12.mspx] |
1da177e4 LT |
202 | */ |
203 | ||
c767a54b JP |
204 | #define pr_fmt(fmt) "apm: " fmt |
205 | ||
1da177e4 LT |
206 | #include <linux/module.h> |
207 | ||
208 | #include <linux/poll.h> | |
209 | #include <linux/types.h> | |
210 | #include <linux/stddef.h> | |
211 | #include <linux/timer.h> | |
212 | #include <linux/fcntl.h> | |
213 | #include <linux/slab.h> | |
214 | #include <linux/stat.h> | |
215 | #include <linux/proc_fs.h> | |
016d6f35 | 216 | #include <linux/seq_file.h> |
1da177e4 LT |
217 | #include <linux/miscdevice.h> |
218 | #include <linux/apm_bios.h> | |
219 | #include <linux/init.h> | |
220 | #include <linux/time.h> | |
221 | #include <linux/sched.h> | |
222 | #include <linux/pm.h> | |
a9415644 | 223 | #include <linux/capability.h> |
1da177e4 LT |
224 | #include <linux/device.h> |
225 | #include <linux/kernel.h> | |
83144186 | 226 | #include <linux/freezer.h> |
1da177e4 | 227 | #include <linux/smp.h> |
1da177e4 LT |
228 | #include <linux/dmi.h> |
229 | #include <linux/suspend.h> | |
fc09561d | 230 | #include <linux/kthread.h> |
4f2479f0 | 231 | #include <linux/jiffies.h> |
6831c6ed | 232 | #include <linux/acpi.h> |
19234c08 | 233 | #include <linux/syscore_ops.h> |
334955ef | 234 | #include <linux/i8253.h> |
1da177e4 | 235 | |
1da177e4 LT |
236 | #include <asm/uaccess.h> |
237 | #include <asm/desc.h> | |
77a9a768 | 238 | #include <asm/olpc.h> |
6020c8f3 | 239 | #include <asm/paravirt.h> |
07f3331c | 240 | #include <asm/reboot.h> |
1da177e4 | 241 | |
1da177e4 LT |
242 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
243 | extern int (*console_blank_hook)(int); | |
244 | #endif | |
245 | ||
246 | /* | |
247 | * The apm_bios device is one of the misc char devices. | |
248 | * This is its minor number. | |
249 | */ | |
250 | #define APM_MINOR_DEV 134 | |
251 | ||
252 | /* | |
1da177e4 LT |
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 | ||
1164dd00 | 304 | #include <asm/apm.h> |
1da177e4 | 305 | |
1da177e4 LT |
306 | /* |
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 | */ | |
3f4380a1 | 327 | #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) |
1da177e4 LT |
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; | |
3f4380a1 | 339 | struct apm_user *next; |
77617bd8 DP |
340 | unsigned int suser: 1; |
341 | unsigned int writer: 1; | |
342 | unsigned int reader: 1; | |
343 | unsigned int suspend_wait: 1; | |
1da177e4 LT |
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 | |
99c63221 | 363 | #warning deprecated CONFIG_APM_CPU_IDLE will be deleted in 2012 |
1da177e4 LT |
364 | #define DEFAULT_IDLE_THRESHOLD 95 |
365 | #else | |
366 | #define DEFAULT_IDLE_THRESHOLD 100 | |
367 | #endif | |
368 | #define DEFAULT_IDLE_PERIOD (100 / 3) | |
369 | ||
370 | /* | |
371 | * Local variables | |
372 | */ | |
373 | static struct { | |
374 | unsigned long offset; | |
375 | unsigned short segment; | |
3f4380a1 CG |
376 | } apm_bios_entry; |
377 | static int clock_slowed; | |
378 | static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; | |
379 | static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; | |
380 | static int set_pm_idle; | |
381 | static int suspends_pending; | |
382 | static int standbys_pending; | |
383 | static int ignore_sys_suspend; | |
384 | static int ignore_normal_resume; | |
385 | static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; | |
386 | ||
476bc001 RR |
387 | static bool debug __read_mostly; |
388 | static bool smp __read_mostly; | |
3f4380a1 | 389 | static int apm_disabled = -1; |
1da177e4 | 390 | #ifdef CONFIG_SMP |
476bc001 | 391 | static bool power_off; |
1da177e4 | 392 | #else |
476bc001 | 393 | static bool power_off = 1; |
1da177e4 | 394 | #endif |
476bc001 | 395 | static bool realmode_power_off; |
1da177e4 | 396 | #ifdef CONFIG_APM_ALLOW_INTS |
476bc001 | 397 | static bool allow_ints = 1; |
1da177e4 | 398 | #else |
476bc001 | 399 | static bool allow_ints; |
1da177e4 | 400 | #endif |
476bc001 | 401 | static bool broken_psr; |
1da177e4 LT |
402 | |
403 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); | |
404 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); | |
3f4380a1 | 405 | static struct apm_user *user_list; |
1da177e4 | 406 | static DEFINE_SPINLOCK(user_list_lock); |
05d86412 | 407 | static DEFINE_MUTEX(apm_mutex); |
c7425314 AM |
408 | |
409 | /* | |
410 | * Set up a segment that references the real mode segment 0x40 | |
411 | * that extends up to the end of page zero (that we have reserved). | |
412 | * This is for buggy BIOS's that refer to (real mode) segment 0x40 | |
413 | * even though they are called in protected mode. | |
414 | */ | |
415 | static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, | |
416 | (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); | |
1da177e4 | 417 | |
3f4380a1 | 418 | static const char driver_version[] = "1.16ac"; /* no spaces */ |
1da177e4 | 419 | |
fc09561d SH |
420 | static struct task_struct *kapmd_task; |
421 | ||
1da177e4 LT |
422 | /* |
423 | * APM event names taken from the APM 1.2 specification. These are | |
424 | * the message codes that the BIOS uses to tell us about events | |
425 | */ | |
3f4380a1 | 426 | static const char * const apm_event_name[] = { |
1da177e4 LT |
427 | "system standby", |
428 | "system suspend", | |
429 | "normal resume", | |
430 | "critical resume", | |
431 | "low battery", | |
432 | "power status change", | |
433 | "update time", | |
434 | "critical suspend", | |
435 | "user standby", | |
436 | "user suspend", | |
437 | "system standby resume", | |
438 | "capabilities change" | |
439 | }; | |
38e548ee | 440 | #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) |
1da177e4 LT |
441 | |
442 | typedef struct lookup_t { | |
443 | int key; | |
3f4380a1 | 444 | char *msg; |
1da177e4 LT |
445 | } lookup_t; |
446 | ||
447 | /* | |
448 | * The BIOS returns a set of standard error codes in AX when the | |
449 | * carry flag is set. | |
450 | */ | |
3f4380a1 | 451 | |
1da177e4 LT |
452 | static const lookup_t error_table[] = { |
453 | /* N/A { APM_SUCCESS, "Operation succeeded" }, */ | |
454 | { APM_DISABLED, "Power management disabled" }, | |
455 | { APM_CONNECTED, "Real mode interface already connected" }, | |
456 | { APM_NOT_CONNECTED, "Interface not connected" }, | |
457 | { APM_16_CONNECTED, "16 bit interface already connected" }, | |
458 | /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ | |
459 | { APM_32_CONNECTED, "32 bit interface already connected" }, | |
460 | { APM_32_UNSUPPORTED, "32 bit interface not supported" }, | |
461 | { APM_BAD_DEVICE, "Unrecognized device ID" }, | |
462 | { APM_BAD_PARAM, "Parameter out of range" }, | |
463 | { APM_NOT_ENGAGED, "Interface not engaged" }, | |
464 | { APM_BAD_FUNCTION, "Function not supported" }, | |
465 | { APM_RESUME_DISABLED, "Resume timer disabled" }, | |
466 | { APM_BAD_STATE, "Unable to enter requested state" }, | |
467 | /* N/A { APM_NO_EVENTS, "No events pending" }, */ | |
468 | { APM_NO_ERROR, "BIOS did not set a return code" }, | |
469 | { APM_NOT_PRESENT, "No APM present" } | |
470 | }; | |
38e548ee | 471 | #define ERROR_COUNT ARRAY_SIZE(error_table) |
1da177e4 LT |
472 | |
473 | /** | |
474 | * apm_error - display an APM error | |
475 | * @str: information string | |
476 | * @err: APM BIOS return code | |
477 | * | |
478 | * Write a meaningful log entry to the kernel log in the event of | |
89bd55d1 | 479 | * an APM error. Note that this also handles (negative) kernel errors. |
1da177e4 | 480 | */ |
3f4380a1 | 481 | |
1da177e4 LT |
482 | static void apm_error(char *str, int err) |
483 | { | |
3f4380a1 | 484 | int i; |
1da177e4 LT |
485 | |
486 | for (i = 0; i < ERROR_COUNT; i++) | |
3f4380a1 CG |
487 | if (error_table[i].key == err) |
488 | break; | |
1da177e4 | 489 | if (i < ERROR_COUNT) |
c767a54b | 490 | pr_notice("%s: %s\n", str, error_table[i].msg); |
89bd55d1 | 491 | else if (err < 0) |
c767a54b | 492 | pr_notice("%s: linux error code %i\n", str, err); |
1da177e4 | 493 | else |
c767a54b | 494 | pr_notice("%s: unknown error code %#2.2x\n", |
3f4380a1 | 495 | str, err); |
1da177e4 LT |
496 | } |
497 | ||
1da177e4 LT |
498 | /* |
499 | * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and | |
500 | * apm_info.allow_ints, we are being really paranoid here! Not only | |
501 | * are interrupts disabled, but all the segment registers (except SS) | |
502 | * are saved and zeroed this means that if the BIOS tries to reference | |
503 | * any data without explicitly loading the segment registers, the kernel | |
504 | * will fault immediately rather than have some unforeseen circumstances | |
505 | * for the rest of the kernel. And it will be very obvious! :-) Doing | |
506 | * this depends on CS referring to the same physical memory as DS so that | |
507 | * DS can be zeroed before the call. Unfortunately, we can't do anything | |
508 | * about the stack segment/pointer. Also, we tell the compiler that | |
509 | * everything could change. | |
510 | * | |
511 | * Also, we KNOW that for the non error case of apm_bios_call, there | |
512 | * is no useful data returned in the low order 8 bits of eax. | |
513 | */ | |
3864c489 PZ |
514 | |
515 | static inline unsigned long __apm_irq_save(void) | |
516 | { | |
517 | unsigned long flags; | |
518 | local_save_flags(flags); | |
519 | if (apm_info.allow_ints) { | |
520 | if (irqs_disabled_flags(flags)) | |
521 | local_irq_enable(); | |
522 | } else | |
523 | local_irq_disable(); | |
524 | ||
525 | return flags; | |
526 | } | |
527 | ||
528 | #define apm_irq_save(flags) \ | |
529 | do { flags = __apm_irq_save(); } while (0) | |
530 | ||
531 | static inline void apm_irq_restore(unsigned long flags) | |
532 | { | |
533 | if (irqs_disabled_flags(flags)) | |
1da177e4 | 534 | local_irq_disable(); |
3864c489 PZ |
535 | else if (irqs_disabled()) |
536 | local_irq_enable(); | |
537 | } | |
1da177e4 LT |
538 | |
539 | #ifdef APM_ZERO_SEGS | |
540 | # define APM_DECL_SEGS \ | |
541 | unsigned int saved_fs; unsigned int saved_gs; | |
542 | # define APM_DO_SAVE_SEGS \ | |
543 | savesegment(fs, saved_fs); savesegment(gs, saved_gs) | |
544 | # define APM_DO_RESTORE_SEGS \ | |
545 | loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) | |
546 | #else | |
547 | # define APM_DECL_SEGS | |
548 | # define APM_DO_SAVE_SEGS | |
549 | # define APM_DO_RESTORE_SEGS | |
550 | #endif | |
551 | ||
89bd55d1 RR |
552 | struct apm_bios_call { |
553 | u32 func; | |
554 | /* In and out */ | |
555 | u32 ebx; | |
556 | u32 ecx; | |
557 | /* Out only */ | |
558 | u32 eax; | |
559 | u32 edx; | |
560 | u32 esi; | |
561 | ||
562 | /* Error: -ENOMEM, or bits 8-15 of eax */ | |
563 | int err; | |
564 | }; | |
565 | ||
1da177e4 | 566 | /** |
89bd55d1 RR |
567 | * __apm_bios_call - Make an APM BIOS 32bit call |
568 | * @_call: pointer to struct apm_bios_call. | |
1da177e4 LT |
569 | * |
570 | * Make an APM call using the 32bit protected mode interface. The | |
571 | * caller is responsible for knowing if APM BIOS is configured and | |
572 | * enabled. This call can disable interrupts for a long period of | |
573 | * time on some laptops. The return value is in AH and the carry | |
574 | * flag is loaded into AL. If there is an error, then the error | |
575 | * code is returned in AH (bits 8-15 of eax) and this function | |
576 | * returns non-zero. | |
89bd55d1 RR |
577 | * |
578 | * Note: this makes the call on the current CPU. | |
1da177e4 | 579 | */ |
89bd55d1 | 580 | static long __apm_bios_call(void *_call) |
1da177e4 LT |
581 | { |
582 | APM_DECL_SEGS | |
583 | unsigned long flags; | |
1da177e4 LT |
584 | int cpu; |
585 | struct desc_struct save_desc_40; | |
251e6912 | 586 | struct desc_struct *gdt; |
89bd55d1 | 587 | struct apm_bios_call *call = _call; |
3f4380a1 | 588 | |
1da177e4 | 589 | cpu = get_cpu(); |
89bd55d1 | 590 | BUG_ON(cpu != 0); |
251e6912 ZA |
591 | gdt = get_cpu_gdt_table(cpu); |
592 | save_desc_40 = gdt[0x40 / 8]; | |
593 | gdt[0x40 / 8] = bad_bios_desc; | |
1da177e4 | 594 | |
3864c489 | 595 | apm_irq_save(flags); |
1da177e4 | 596 | APM_DO_SAVE_SEGS; |
89bd55d1 RR |
597 | apm_bios_call_asm(call->func, call->ebx, call->ecx, |
598 | &call->eax, &call->ebx, &call->ecx, &call->edx, | |
599 | &call->esi); | |
1da177e4 | 600 | APM_DO_RESTORE_SEGS; |
3864c489 | 601 | apm_irq_restore(flags); |
251e6912 | 602 | gdt[0x40 / 8] = save_desc_40; |
1da177e4 | 603 | put_cpu(); |
3f4380a1 | 604 | |
89bd55d1 RR |
605 | return call->eax & 0xff; |
606 | } | |
607 | ||
608 | /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ | |
609 | static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) | |
610 | { | |
611 | int ret; | |
612 | ||
613 | /* Don't bother with work_on_cpu in the common case, so we don't | |
614 | * have to worry about OOM or overhead. */ | |
615 | if (get_cpu() == 0) { | |
616 | ret = fn(call); | |
617 | put_cpu(); | |
618 | } else { | |
619 | put_cpu(); | |
620 | ret = work_on_cpu(0, fn, call); | |
621 | } | |
622 | ||
623 | /* work_on_cpu can fail with -ENOMEM */ | |
624 | if (ret < 0) | |
625 | call->err = ret; | |
626 | else | |
627 | call->err = (call->eax >> 8) & 0xff; | |
628 | ||
629 | return ret; | |
1da177e4 LT |
630 | } |
631 | ||
632 | /** | |
89bd55d1 RR |
633 | * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) |
634 | * @call: the apm_bios_call registers. | |
635 | * | |
636 | * If there is an error, it is returned in @call.err. | |
637 | */ | |
638 | static int apm_bios_call(struct apm_bios_call *call) | |
639 | { | |
640 | return on_cpu0(__apm_bios_call, call); | |
641 | } | |
642 | ||
643 | /** | |
644 | * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) | |
645 | * @_call: pointer to struct apm_bios_call. | |
1da177e4 | 646 | * |
87af2ffd | 647 | * Make a BIOS call that returns one value only, or just status. |
1da177e4 | 648 | * If there is an error, then the error code is returned in AH |
89bd55d1 RR |
649 | * (bits 8-15 of eax) and this function returns non-zero (it can |
650 | * also return -ENOMEM). This is used for simpler BIOS operations. | |
651 | * This call may hold interrupts off for a long time on some laptops. | |
652 | * | |
653 | * Note: this makes the call on the current CPU. | |
1da177e4 | 654 | */ |
89bd55d1 | 655 | static long __apm_bios_call_simple(void *_call) |
1da177e4 LT |
656 | { |
657 | u8 error; | |
658 | APM_DECL_SEGS | |
659 | unsigned long flags; | |
1da177e4 LT |
660 | int cpu; |
661 | struct desc_struct save_desc_40; | |
251e6912 | 662 | struct desc_struct *gdt; |
89bd55d1 | 663 | struct apm_bios_call *call = _call; |
3f4380a1 | 664 | |
1da177e4 | 665 | cpu = get_cpu(); |
89bd55d1 | 666 | BUG_ON(cpu != 0); |
251e6912 ZA |
667 | gdt = get_cpu_gdt_table(cpu); |
668 | save_desc_40 = gdt[0x40 / 8]; | |
669 | gdt[0x40 / 8] = bad_bios_desc; | |
1da177e4 | 670 | |
3864c489 | 671 | apm_irq_save(flags); |
1da177e4 | 672 | APM_DO_SAVE_SEGS; |
89bd55d1 RR |
673 | error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, |
674 | &call->eax); | |
1da177e4 | 675 | APM_DO_RESTORE_SEGS; |
3864c489 | 676 | apm_irq_restore(flags); |
251e6912 | 677 | gdt[0x40 / 8] = save_desc_40; |
1da177e4 | 678 | put_cpu(); |
1da177e4 LT |
679 | return error; |
680 | } | |
681 | ||
89bd55d1 RR |
682 | /** |
683 | * apm_bios_call_simple - make a simple APM BIOS 32bit call | |
684 | * @func: APM function to invoke | |
685 | * @ebx_in: EBX register value for BIOS call | |
686 | * @ecx_in: ECX register value for BIOS call | |
687 | * @eax: EAX register on return from the BIOS call | |
688 | * @err: bits | |
689 | * | |
690 | * Make a BIOS call that returns one value only, or just status. | |
691 | * If there is an error, then the error code is returned in @err | |
692 | * and this function returns non-zero. This is used for simpler | |
693 | * BIOS operations. This call may hold interrupts off for a long | |
694 | * time on some laptops. | |
695 | */ | |
696 | static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, | |
697 | int *err) | |
698 | { | |
699 | struct apm_bios_call call; | |
700 | int ret; | |
701 | ||
702 | call.func = func; | |
703 | call.ebx = ebx_in; | |
704 | call.ecx = ecx_in; | |
705 | ||
706 | ret = on_cpu0(__apm_bios_call_simple, &call); | |
707 | *eax = call.eax; | |
708 | *err = call.err; | |
709 | return ret; | |
710 | } | |
711 | ||
1da177e4 LT |
712 | /** |
713 | * apm_driver_version - APM driver version | |
714 | * @val: loaded with the APM version on return | |
715 | * | |
716 | * Retrieve the APM version supported by the BIOS. This is only | |
717 | * supported for APM 1.1 or higher. An error indicates APM 1.0 is | |
718 | * probably present. | |
719 | * | |
720 | * On entry val should point to a value indicating the APM driver | |
721 | * version with the high byte being the major and the low byte the | |
722 | * minor number both in BCD | |
723 | * | |
724 | * On return it will hold the BIOS revision supported in the | |
725 | * same format. | |
726 | */ | |
727 | ||
728 | static int apm_driver_version(u_short *val) | |
729 | { | |
3f4380a1 | 730 | u32 eax; |
89bd55d1 | 731 | int err; |
1da177e4 | 732 | |
89bd55d1 RR |
733 | if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err)) |
734 | return err; | |
1da177e4 LT |
735 | *val = eax; |
736 | return APM_SUCCESS; | |
737 | } | |
738 | ||
739 | /** | |
740 | * apm_get_event - get an APM event from the BIOS | |
741 | * @event: pointer to the event | |
742 | * @info: point to the event information | |
743 | * | |
744 | * The APM BIOS provides a polled information for event | |
745 | * reporting. The BIOS expects to be polled at least every second | |
746 | * when events are pending. When a message is found the caller should | |
747 | * poll until no more messages are present. However, this causes | |
748 | * problems on some laptops where a suspend event notification is | |
749 | * not cleared until it is acknowledged. | |
750 | * | |
751 | * Additional information is returned in the info pointer, providing | |
752 | * that APM 1.2 is in use. If no messges are pending the value 0x80 | |
753 | * is returned (No power management events pending). | |
754 | */ | |
1da177e4 LT |
755 | static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) |
756 | { | |
89bd55d1 | 757 | struct apm_bios_call call; |
1da177e4 | 758 | |
89bd55d1 RR |
759 | call.func = APM_FUNC_GET_EVENT; |
760 | call.ebx = call.ecx = 0; | |
761 | ||
762 | if (apm_bios_call(&call)) | |
763 | return call.err; | |
764 | ||
765 | *event = call.ebx; | |
1da177e4 LT |
766 | if (apm_info.connection_version < 0x0102) |
767 | *info = ~0; /* indicate info not valid */ | |
768 | else | |
89bd55d1 | 769 | *info = call.ecx; |
1da177e4 LT |
770 | return APM_SUCCESS; |
771 | } | |
772 | ||
773 | /** | |
774 | * set_power_state - set the power management state | |
775 | * @what: which items to transition | |
776 | * @state: state to transition to | |
777 | * | |
778 | * Request an APM change of state for one or more system devices. The | |
779 | * processor state must be transitioned last of all. what holds the | |
780 | * class of device in the upper byte and the device number (0xFF for | |
781 | * all) for the object to be transitioned. | |
782 | * | |
783 | * The state holds the state to transition to, which may in fact | |
784 | * be an acceptance of a BIOS requested state change. | |
785 | */ | |
3f4380a1 | 786 | |
1da177e4 LT |
787 | static int set_power_state(u_short what, u_short state) |
788 | { | |
3f4380a1 | 789 | u32 eax; |
89bd55d1 | 790 | int err; |
1da177e4 | 791 | |
89bd55d1 RR |
792 | if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err)) |
793 | return err; | |
1da177e4 LT |
794 | return APM_SUCCESS; |
795 | } | |
796 | ||
797 | /** | |
798 | * set_system_power_state - set system wide power state | |
799 | * @state: which state to enter | |
800 | * | |
801 | * Transition the entire system into a new APM power state. | |
802 | */ | |
3f4380a1 | 803 | |
1da177e4 LT |
804 | static int set_system_power_state(u_short state) |
805 | { | |
806 | return set_power_state(APM_DEVICE_ALL, state); | |
807 | } | |
808 | ||
809 | /** | |
810 | * apm_do_idle - perform power saving | |
811 | * | |
812 | * This function notifies the BIOS that the processor is (in the view | |
813 | * of the OS) idle. It returns -1 in the event that the BIOS refuses | |
814 | * to handle the idle request. On a success the function returns 1 | |
815 | * if the BIOS did clock slowing or 0 otherwise. | |
816 | */ | |
3f4380a1 | 817 | |
1da177e4 LT |
818 | static int apm_do_idle(void) |
819 | { | |
3f4380a1 CG |
820 | u32 eax; |
821 | u8 ret = 0; | |
822 | int idled = 0; | |
823 | int polling; | |
dc731fbb | 824 | int err = 0; |
64c7c8f8 | 825 | |
495ab9c0 | 826 | polling = !!(current_thread_info()->status & TS_POLLING); |
64c7c8f8 | 827 | if (polling) { |
495ab9c0 | 828 | current_thread_info()->status &= ~TS_POLLING; |
0888f06a IM |
829 | /* |
830 | * TS_POLLING-cleared state must be visible before we | |
831 | * test NEED_RESCHED: | |
832 | */ | |
833 | smp_mb(); | |
64c7c8f8 NP |
834 | } |
835 | if (!need_resched()) { | |
836 | idled = 1; | |
89bd55d1 | 837 | ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); |
64c7c8f8 NP |
838 | } |
839 | if (polling) | |
495ab9c0 | 840 | current_thread_info()->status |= TS_POLLING; |
64c7c8f8 NP |
841 | |
842 | if (!idled) | |
843 | return 0; | |
844 | ||
845 | if (ret) { | |
1da177e4 LT |
846 | static unsigned long t; |
847 | ||
848 | /* This always fails on some SMP boards running UP kernels. | |
849 | * Only report the failure the first 5 times. | |
850 | */ | |
3f4380a1 | 851 | if (++t < 5) { |
89bd55d1 | 852 | printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); |
1da177e4 LT |
853 | t = jiffies; |
854 | } | |
855 | return -1; | |
856 | } | |
857 | clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; | |
858 | return clock_slowed; | |
859 | } | |
860 | ||
861 | /** | |
862 | * apm_do_busy - inform the BIOS the CPU is busy | |
863 | * | |
3f4380a1 | 864 | * Request that the BIOS brings the CPU back to full performance. |
1da177e4 | 865 | */ |
3f4380a1 | 866 | |
1da177e4 LT |
867 | static void apm_do_busy(void) |
868 | { | |
3f4380a1 | 869 | u32 dummy; |
89bd55d1 | 870 | int err; |
1da177e4 LT |
871 | |
872 | if (clock_slowed || ALWAYS_CALL_BUSY) { | |
89bd55d1 | 873 | (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); |
1da177e4 LT |
874 | clock_slowed = 0; |
875 | } | |
876 | } | |
877 | ||
878 | /* | |
879 | * If no process has really been interested in | |
880 | * the CPU for some time, we want to call BIOS | |
881 | * power management - we probably want | |
882 | * to conserve power. | |
883 | */ | |
3f4380a1 CG |
884 | #define IDLE_CALC_LIMIT (HZ * 100) |
885 | #define IDLE_LEAKY_MAX 16 | |
1da177e4 | 886 | |
87af2ffd | 887 | static void (*original_pm_idle)(void) __read_mostly; |
1da177e4 | 888 | |
1da177e4 LT |
889 | /** |
890 | * apm_cpu_idle - cpu idling for APM capable Linux | |
891 | * | |
3f4380a1 | 892 | * This is the idling function the kernel executes when APM is available. It |
1da177e4 LT |
893 | * tries to do BIOS powermanagement based on the average system idle time. |
894 | * Furthermore it calls the system default idle routine. | |
895 | */ | |
896 | ||
897 | static void apm_cpu_idle(void) | |
898 | { | |
899 | static int use_apm_idle; /* = 0 */ | |
900 | static unsigned int last_jiffies; /* = 0 */ | |
901 | static unsigned int last_stime; /* = 0 */ | |
902 | ||
903 | int apm_idle_done = 0; | |
904 | unsigned int jiffies_since_last_check = jiffies - last_jiffies; | |
905 | unsigned int bucket; | |
906 | ||
99c63221 | 907 | WARN_ONCE(1, "deprecated apm_cpu_idle will be deleted in 2012"); |
1da177e4 LT |
908 | recalc: |
909 | if (jiffies_since_last_check > IDLE_CALC_LIMIT) { | |
910 | use_apm_idle = 0; | |
911 | last_jiffies = jiffies; | |
912 | last_stime = current->stime; | |
913 | } else if (jiffies_since_last_check > idle_period) { | |
914 | unsigned int idle_percentage; | |
915 | ||
916 | idle_percentage = current->stime - last_stime; | |
917 | idle_percentage *= 100; | |
918 | idle_percentage /= jiffies_since_last_check; | |
919 | use_apm_idle = (idle_percentage > idle_threshold); | |
920 | if (apm_info.forbid_idle) | |
921 | use_apm_idle = 0; | |
922 | last_jiffies = jiffies; | |
923 | last_stime = current->stime; | |
924 | } | |
925 | ||
926 | bucket = IDLE_LEAKY_MAX; | |
927 | ||
928 | while (!need_resched()) { | |
929 | if (use_apm_idle) { | |
930 | unsigned int t; | |
931 | ||
932 | t = jiffies; | |
933 | switch (apm_do_idle()) { | |
3f4380a1 CG |
934 | case 0: |
935 | apm_idle_done = 1; | |
1da177e4 LT |
936 | if (t != jiffies) { |
937 | if (bucket) { | |
938 | bucket = IDLE_LEAKY_MAX; | |
939 | continue; | |
940 | } | |
941 | } else if (bucket) { | |
942 | bucket--; | |
943 | continue; | |
944 | } | |
945 | break; | |
3f4380a1 CG |
946 | case 1: |
947 | apm_idle_done = 1; | |
1da177e4 LT |
948 | break; |
949 | default: /* BIOS refused */ | |
950 | break; | |
951 | } | |
952 | } | |
953 | if (original_pm_idle) | |
954 | original_pm_idle(); | |
955 | else | |
956 | default_idle(); | |
7f424a8b | 957 | local_irq_disable(); |
1da177e4 LT |
958 | jiffies_since_last_check = jiffies - last_jiffies; |
959 | if (jiffies_since_last_check > idle_period) | |
960 | goto recalc; | |
961 | } | |
962 | ||
963 | if (apm_idle_done) | |
964 | apm_do_busy(); | |
7f424a8b PZ |
965 | |
966 | local_irq_enable(); | |
1da177e4 LT |
967 | } |
968 | ||
969 | /** | |
970 | * apm_power_off - ask the BIOS to power off | |
971 | * | |
972 | * Handle the power off sequence. This is the one piece of code we | |
973 | * will execute even on SMP machines. In order to deal with BIOS | |
974 | * bugs we support real mode APM BIOS power off calls. We also make | |
975 | * the SMP call on CPU0 as some systems will only honour this call | |
976 | * on their first cpu. | |
977 | */ | |
3f4380a1 | 978 | |
1da177e4 LT |
979 | static void apm_power_off(void) |
980 | { | |
1da177e4 | 981 | /* Some bioses don't like being called from CPU != 0 */ |
3f4380a1 | 982 | if (apm_info.realmode_power_off) { |
89bd55d1 | 983 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
3d35ac34 | 984 | machine_real_restart(MRR_APM); |
3f4380a1 CG |
985 | } else { |
986 | (void)set_system_power_state(APM_STATE_OFF); | |
1da177e4 | 987 | } |
1da177e4 LT |
988 | } |
989 | ||
990 | #ifdef CONFIG_APM_DO_ENABLE | |
991 | ||
992 | /** | |
993 | * apm_enable_power_management - enable BIOS APM power management | |
994 | * @enable: enable yes/no | |
995 | * | |
3f4380a1 | 996 | * Enable or disable the APM BIOS power services. |
1da177e4 | 997 | */ |
3f4380a1 | 998 | |
1da177e4 LT |
999 | static int apm_enable_power_management(int enable) |
1000 | { | |
3f4380a1 | 1001 | u32 eax; |
89bd55d1 | 1002 | int err; |
1da177e4 LT |
1003 | |
1004 | if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) | |
1005 | return APM_NOT_ENGAGED; | |
1006 | if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, | |
89bd55d1 RR |
1007 | enable, &eax, &err)) |
1008 | return err; | |
1da177e4 LT |
1009 | if (enable) |
1010 | apm_info.bios.flags &= ~APM_BIOS_DISABLED; | |
1011 | else | |
1012 | apm_info.bios.flags |= APM_BIOS_DISABLED; | |
1013 | return APM_SUCCESS; | |
1014 | } | |
1015 | #endif | |
1016 | ||
1017 | /** | |
1018 | * apm_get_power_status - get current power state | |
1019 | * @status: returned status | |
1020 | * @bat: battery info | |
1021 | * @life: estimated life | |
1022 | * | |
1023 | * Obtain the current power status from the APM BIOS. We return a | |
1024 | * status which gives the rough battery status, and current power | |
1025 | * source. The bat value returned give an estimate as a percentage | |
1026 | * of life and a status value for the battery. The estimated life | |
1027 | * if reported is a lifetime in secodnds/minutes at current powwer | |
1028 | * consumption. | |
1029 | */ | |
3f4380a1 | 1030 | |
1da177e4 LT |
1031 | static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) |
1032 | { | |
89bd55d1 RR |
1033 | struct apm_bios_call call; |
1034 | ||
1035 | call.func = APM_FUNC_GET_STATUS; | |
1036 | call.ebx = APM_DEVICE_ALL; | |
1037 | call.ecx = 0; | |
1da177e4 LT |
1038 | |
1039 | if (apm_info.get_power_status_broken) | |
1040 | return APM_32_UNSUPPORTED; | |
89bd55d1 RR |
1041 | if (apm_bios_call(&call)) |
1042 | return call.err; | |
1043 | *status = call.ebx; | |
1044 | *bat = call.ecx; | |
1da177e4 | 1045 | if (apm_info.get_power_status_swabinminutes) { |
89bd55d1 | 1046 | *life = swab16((u16)call.edx); |
1da177e4 LT |
1047 | *life |= 0x8000; |
1048 | } else | |
89bd55d1 | 1049 | *life = call.edx; |
1da177e4 LT |
1050 | return APM_SUCCESS; |
1051 | } | |
1052 | ||
1053 | #if 0 | |
1054 | static int apm_get_battery_status(u_short which, u_short *status, | |
1055 | u_short *bat, u_short *life, u_short *nbat) | |
1056 | { | |
3f4380a1 CG |
1057 | u32 eax; |
1058 | u32 ebx; | |
1059 | u32 ecx; | |
1060 | u32 edx; | |
1061 | u32 esi; | |
1da177e4 LT |
1062 | |
1063 | if (apm_info.connection_version < 0x0102) { | |
1064 | /* pretend we only have one battery. */ | |
1065 | if (which != 1) | |
1066 | return APM_BAD_DEVICE; | |
1067 | *nbat = 1; | |
1068 | return apm_get_power_status(status, bat, life); | |
1069 | } | |
1070 | ||
1071 | if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, | |
3f4380a1 | 1072 | &ebx, &ecx, &edx, &esi)) |
1da177e4 LT |
1073 | return (eax >> 8) & 0xff; |
1074 | *status = ebx; | |
1075 | *bat = ecx; | |
1076 | *life = edx; | |
1077 | *nbat = esi; | |
1078 | return APM_SUCCESS; | |
1079 | } | |
1080 | #endif | |
1081 | ||
1082 | /** | |
1083 | * apm_engage_power_management - enable PM on a device | |
1084 | * @device: identity of device | |
1085 | * @enable: on/off | |
1086 | * | |
1087 | * Activate or deactive power management on either a specific device | |
1088 | * or the entire system (%APM_DEVICE_ALL). | |
1089 | */ | |
3f4380a1 | 1090 | |
1da177e4 LT |
1091 | static int apm_engage_power_management(u_short device, int enable) |
1092 | { | |
3f4380a1 | 1093 | u32 eax; |
89bd55d1 | 1094 | int err; |
1da177e4 LT |
1095 | |
1096 | if ((enable == 0) && (device == APM_DEVICE_ALL) | |
1097 | && (apm_info.bios.flags & APM_BIOS_DISABLED)) | |
1098 | return APM_DISABLED; | |
89bd55d1 RR |
1099 | if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, |
1100 | &eax, &err)) | |
1101 | return err; | |
1da177e4 LT |
1102 | if (device == APM_DEVICE_ALL) { |
1103 | if (enable) | |
1104 | apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; | |
1105 | else | |
1106 | apm_info.bios.flags |= APM_BIOS_DISENGAGED; | |
1107 | } | |
1108 | return APM_SUCCESS; | |
1109 | } | |
1110 | ||
1111 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1112 | ||
1113 | /** | |
1114 | * apm_console_blank - blank the display | |
1115 | * @blank: on/off | |
1116 | * | |
1117 | * Attempt to blank the console, firstly by blanking just video device | |
1118 | * zero, and if that fails (some BIOSes don't support it) then it blanks | |
1119 | * all video devices. Typically the BIOS will do laptop backlight and | |
1120 | * monitor powerdown for us. | |
1121 | */ | |
3f4380a1 | 1122 | |
1da177e4 LT |
1123 | static int apm_console_blank(int blank) |
1124 | { | |
87af2ffd AM |
1125 | int error = APM_NOT_ENGAGED; /* silence gcc */ |
1126 | int i; | |
3841b0a1 JC |
1127 | u_short state; |
1128 | static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; | |
1da177e4 LT |
1129 | |
1130 | state = blank ? APM_STATE_STANDBY : APM_STATE_READY; | |
3841b0a1 JC |
1131 | |
1132 | for (i = 0; i < ARRAY_SIZE(dev); i++) { | |
1133 | error = set_power_state(dev[i], state); | |
1134 | ||
1135 | if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) | |
1136 | return 1; | |
1137 | ||
1138 | if (error == APM_NOT_ENGAGED) | |
1139 | break; | |
1da177e4 | 1140 | } |
3841b0a1 | 1141 | |
73374454 | 1142 | if (error == APM_NOT_ENGAGED) { |
1da177e4 LT |
1143 | static int tried; |
1144 | int eng_error; | |
1145 | if (tried++ == 0) { | |
1146 | eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); | |
1147 | if (eng_error) { | |
1148 | apm_error("set display", error); | |
1149 | apm_error("engage interface", eng_error); | |
1150 | return 0; | |
1151 | } else | |
1152 | return apm_console_blank(blank); | |
1153 | } | |
1154 | } | |
1155 | apm_error("set display", error); | |
1156 | return 0; | |
1157 | } | |
1158 | #endif | |
1159 | ||
1160 | static int queue_empty(struct apm_user *as) | |
1161 | { | |
1162 | return as->event_head == as->event_tail; | |
1163 | } | |
1164 | ||
1165 | static apm_event_t get_queued_event(struct apm_user *as) | |
1166 | { | |
87af2ffd AM |
1167 | if (++as->event_tail >= APM_MAX_EVENTS) |
1168 | as->event_tail = 0; | |
1da177e4 LT |
1169 | return as->events[as->event_tail]; |
1170 | } | |
1171 | ||
1172 | static void queue_event(apm_event_t event, struct apm_user *sender) | |
1173 | { | |
3f4380a1 | 1174 | struct apm_user *as; |
1da177e4 LT |
1175 | |
1176 | spin_lock(&user_list_lock); | |
1177 | if (user_list == NULL) | |
1178 | goto out; | |
1179 | for (as = user_list; as != NULL; as = as->next) { | |
1180 | if ((as == sender) || (!as->reader)) | |
1181 | continue; | |
87af2ffd AM |
1182 | if (++as->event_head >= APM_MAX_EVENTS) |
1183 | as->event_head = 0; | |
1184 | ||
1da177e4 LT |
1185 | if (as->event_head == as->event_tail) { |
1186 | static int notified; | |
1187 | ||
1188 | if (notified++ == 0) | |
c767a54b | 1189 | pr_err("an event queue overflowed\n"); |
87af2ffd AM |
1190 | if (++as->event_tail >= APM_MAX_EVENTS) |
1191 | as->event_tail = 0; | |
1da177e4 LT |
1192 | } |
1193 | as->events[as->event_head] = event; | |
b764a15f | 1194 | if (!as->suser || !as->writer) |
1da177e4 LT |
1195 | continue; |
1196 | switch (event) { | |
1197 | case APM_SYS_SUSPEND: | |
1198 | case APM_USER_SUSPEND: | |
1199 | as->suspends_pending++; | |
1200 | suspends_pending++; | |
1201 | break; | |
1202 | ||
1203 | case APM_SYS_STANDBY: | |
1204 | case APM_USER_STANDBY: | |
1205 | as->standbys_pending++; | |
1206 | standbys_pending++; | |
1207 | break; | |
1208 | } | |
1209 | } | |
1210 | wake_up_interruptible(&apm_waitqueue); | |
1211 | out: | |
1212 | spin_unlock(&user_list_lock); | |
1213 | } | |
1214 | ||
1da177e4 LT |
1215 | static void reinit_timer(void) |
1216 | { | |
1217 | #ifdef INIT_TIMER_AFTER_SUSPEND | |
306e440d | 1218 | unsigned long flags; |
1da177e4 | 1219 | |
ced918eb | 1220 | raw_spin_lock_irqsave(&i8253_lock, flags); |
c9919380 | 1221 | /* set the clock to HZ */ |
01898e3e | 1222 | outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ |
1da177e4 | 1223 | udelay(10); |
01898e3e | 1224 | outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ |
1da177e4 | 1225 | udelay(10); |
01898e3e | 1226 | outb_p(LATCH >> 8, PIT_CH0); /* MSB */ |
1da177e4 | 1227 | udelay(10); |
ced918eb | 1228 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1da177e4 LT |
1229 | #endif |
1230 | } | |
1231 | ||
1232 | static int suspend(int vetoable) | |
1233 | { | |
3f4380a1 | 1234 | int err; |
1da177e4 LT |
1235 | struct apm_user *as; |
1236 | ||
d1616302 | 1237 | dpm_suspend_start(PMSG_SUSPEND); |
cf579dfb | 1238 | dpm_suspend_end(PMSG_SUSPEND); |
2ed8d2b3 RW |
1239 | |
1240 | local_irq_disable(); | |
19234c08 | 1241 | syscore_suspend(); |
1da177e4 | 1242 | |
1da177e4 LT |
1243 | local_irq_enable(); |
1244 | ||
1245 | save_processor_state(); | |
1246 | err = set_system_power_state(APM_STATE_SUSPEND); | |
92c6dc59 | 1247 | ignore_normal_resume = 1; |
1da177e4 LT |
1248 | restore_processor_state(); |
1249 | ||
1250 | local_irq_disable(); | |
c7f40ff1 | 1251 | reinit_timer(); |
1da177e4 LT |
1252 | |
1253 | if (err == APM_NO_ERROR) | |
1254 | err = APM_SUCCESS; | |
1255 | if (err != APM_SUCCESS) | |
1256 | apm_error("suspend", err); | |
1257 | err = (err == APM_SUCCESS) ? 0 : -EIO; | |
2ed8d2b3 | 1258 | |
19234c08 | 1259 | syscore_resume(); |
1da177e4 | 1260 | local_irq_enable(); |
2ed8d2b3 | 1261 | |
cf579dfb | 1262 | dpm_resume_start(PMSG_RESUME); |
d1616302 | 1263 | dpm_resume_end(PMSG_RESUME); |
cf579dfb | 1264 | |
1da177e4 | 1265 | queue_event(APM_NORMAL_RESUME, NULL); |
1da177e4 LT |
1266 | spin_lock(&user_list_lock); |
1267 | for (as = user_list; as != NULL; as = as->next) { | |
1268 | as->suspend_wait = 0; | |
1269 | as->suspend_result = err; | |
1270 | } | |
1271 | spin_unlock(&user_list_lock); | |
1272 | wake_up_interruptible(&apm_suspend_waitqueue); | |
1273 | return err; | |
1274 | } | |
1275 | ||
1276 | static void standby(void) | |
1277 | { | |
3f4380a1 | 1278 | int err; |
1da177e4 | 1279 | |
cf579dfb | 1280 | dpm_suspend_end(PMSG_SUSPEND); |
2ed8d2b3 RW |
1281 | |
1282 | local_irq_disable(); | |
19234c08 | 1283 | syscore_suspend(); |
1da177e4 LT |
1284 | local_irq_enable(); |
1285 | ||
1286 | err = set_system_power_state(APM_STATE_STANDBY); | |
1287 | if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) | |
1288 | apm_error("standby", err); | |
1289 | ||
1290 | local_irq_disable(); | |
19234c08 | 1291 | syscore_resume(); |
1da177e4 | 1292 | local_irq_enable(); |
2ed8d2b3 | 1293 | |
cf579dfb | 1294 | dpm_resume_start(PMSG_RESUME); |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | static apm_event_t get_event(void) | |
1298 | { | |
3f4380a1 CG |
1299 | int error; |
1300 | apm_event_t event = APM_NO_EVENTS; /* silence gcc */ | |
1da177e4 LT |
1301 | apm_eventinfo_t info; |
1302 | ||
1303 | static int notified; | |
1304 | ||
1305 | /* we don't use the eventinfo */ | |
1306 | error = apm_get_event(&event, &info); | |
1307 | if (error == APM_SUCCESS) | |
1308 | return event; | |
1309 | ||
1310 | if ((error != APM_NO_EVENTS) && (notified++ == 0)) | |
1311 | apm_error("get_event", error); | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | static void check_events(void) | |
1317 | { | |
3f4380a1 CG |
1318 | apm_event_t event; |
1319 | static unsigned long last_resume; | |
1320 | static int ignore_bounce; | |
1da177e4 LT |
1321 | |
1322 | while ((event = get_event()) != 0) { | |
1323 | if (debug) { | |
1324 | if (event <= NR_APM_EVENT_NAME) | |
1325 | printk(KERN_DEBUG "apm: received %s notify\n", | |
1326 | apm_event_name[event - 1]); | |
1327 | else | |
1328 | printk(KERN_DEBUG "apm: received unknown " | |
1329 | "event 0x%02x\n", event); | |
1330 | } | |
1331 | if (ignore_bounce | |
4f2479f0 | 1332 | && (time_after(jiffies, last_resume + bounce_interval))) |
1da177e4 LT |
1333 | ignore_bounce = 0; |
1334 | ||
1335 | switch (event) { | |
1336 | case APM_SYS_STANDBY: | |
1337 | case APM_USER_STANDBY: | |
1338 | queue_event(event, NULL); | |
1339 | if (standbys_pending <= 0) | |
1340 | standby(); | |
1341 | break; | |
1342 | ||
1343 | case APM_USER_SUSPEND: | |
1344 | #ifdef CONFIG_APM_IGNORE_USER_SUSPEND | |
1345 | if (apm_info.connection_version > 0x100) | |
1346 | set_system_power_state(APM_STATE_REJECT); | |
1347 | break; | |
1348 | #endif | |
1349 | case APM_SYS_SUSPEND: | |
1350 | if (ignore_bounce) { | |
1351 | if (apm_info.connection_version > 0x100) | |
1352 | set_system_power_state(APM_STATE_REJECT); | |
1353 | break; | |
1354 | } | |
1355 | /* | |
1356 | * If we are already processing a SUSPEND, | |
1357 | * then further SUSPEND events from the BIOS | |
1358 | * will be ignored. We also return here to | |
1359 | * cope with the fact that the Thinkpads keep | |
1360 | * sending a SUSPEND event until something else | |
1361 | * happens! | |
1362 | */ | |
1363 | if (ignore_sys_suspend) | |
1364 | return; | |
1365 | ignore_sys_suspend = 1; | |
1366 | queue_event(event, NULL); | |
1367 | if (suspends_pending <= 0) | |
1368 | (void) suspend(1); | |
1369 | break; | |
1370 | ||
1371 | case APM_NORMAL_RESUME: | |
1372 | case APM_CRITICAL_RESUME: | |
1373 | case APM_STANDBY_RESUME: | |
1374 | ignore_sys_suspend = 0; | |
1375 | last_resume = jiffies; | |
1376 | ignore_bounce = 1; | |
1377 | if ((event != APM_NORMAL_RESUME) | |
1378 | || (ignore_normal_resume == 0)) { | |
d1616302 | 1379 | dpm_resume_end(PMSG_RESUME); |
1da177e4 LT |
1380 | queue_event(event, NULL); |
1381 | } | |
1382 | ignore_normal_resume = 0; | |
1383 | break; | |
1384 | ||
1385 | case APM_CAPABILITY_CHANGE: | |
1386 | case APM_LOW_BATTERY: | |
1387 | case APM_POWER_STATUS_CHANGE: | |
1388 | queue_event(event, NULL); | |
1389 | /* If needed, notify drivers here */ | |
1390 | break; | |
1391 | ||
1392 | case APM_UPDATE_TIME: | |
1da177e4 LT |
1393 | break; |
1394 | ||
1395 | case APM_CRITICAL_SUSPEND: | |
1396 | /* | |
1397 | * We are not allowed to reject a critical suspend. | |
1398 | */ | |
3f4380a1 | 1399 | (void)suspend(0); |
1da177e4 LT |
1400 | break; |
1401 | } | |
1402 | } | |
1403 | } | |
1404 | ||
1405 | static void apm_event_handler(void) | |
1406 | { | |
3f4380a1 CG |
1407 | static int pending_count = 4; |
1408 | int err; | |
1da177e4 LT |
1409 | |
1410 | if ((standbys_pending > 0) || (suspends_pending > 0)) { | |
1411 | if ((apm_info.connection_version > 0x100) && | |
3f4380a1 | 1412 | (pending_count-- <= 0)) { |
1da177e4 LT |
1413 | pending_count = 4; |
1414 | if (debug) | |
1415 | printk(KERN_DEBUG "apm: setting state busy\n"); | |
1416 | err = set_system_power_state(APM_STATE_BUSY); | |
1417 | if (err) | |
1418 | apm_error("busy", err); | |
1419 | } | |
1420 | } else | |
1421 | pending_count = 4; | |
1422 | check_events(); | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * This is the APM thread main loop. | |
1427 | */ | |
1428 | ||
1429 | static void apm_mainloop(void) | |
1430 | { | |
1431 | DECLARE_WAITQUEUE(wait, current); | |
1432 | ||
1433 | add_wait_queue(&apm_waitqueue, &wait); | |
1434 | set_current_state(TASK_INTERRUPTIBLE); | |
1435 | for (;;) { | |
1436 | schedule_timeout(APM_CHECK_TIMEOUT); | |
fc09561d | 1437 | if (kthread_should_stop()) |
1da177e4 LT |
1438 | break; |
1439 | /* | |
1440 | * Ok, check all events, check for idle (and mark us sleeping | |
1441 | * so as not to count towards the load average).. | |
1442 | */ | |
1443 | set_current_state(TASK_INTERRUPTIBLE); | |
1444 | apm_event_handler(); | |
1445 | } | |
1446 | remove_wait_queue(&apm_waitqueue, &wait); | |
1447 | } | |
1448 | ||
1449 | static int check_apm_user(struct apm_user *as, const char *func) | |
1450 | { | |
b764a15f | 1451 | if (as == NULL || as->magic != APM_BIOS_MAGIC) { |
c767a54b | 1452 | pr_err("%s passed bad filp\n", func); |
1da177e4 LT |
1453 | return 1; |
1454 | } | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) | |
1459 | { | |
3f4380a1 CG |
1460 | struct apm_user *as; |
1461 | int i; | |
1462 | apm_event_t event; | |
1da177e4 LT |
1463 | |
1464 | as = fp->private_data; | |
1465 | if (check_apm_user(as, "read")) | |
1466 | return -EIO; | |
1467 | if ((int)count < sizeof(apm_event_t)) | |
1468 | return -EINVAL; | |
1469 | if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) | |
1470 | return -EAGAIN; | |
1471 | wait_event_interruptible(apm_waitqueue, !queue_empty(as)); | |
1472 | i = count; | |
1473 | while ((i >= sizeof(event)) && !queue_empty(as)) { | |
1474 | event = get_queued_event(as); | |
1475 | if (copy_to_user(buf, &event, sizeof(event))) { | |
1476 | if (i < count) | |
1477 | break; | |
1478 | return -EFAULT; | |
1479 | } | |
1480 | switch (event) { | |
1481 | case APM_SYS_SUSPEND: | |
1482 | case APM_USER_SUSPEND: | |
1483 | as->suspends_read++; | |
1484 | break; | |
1485 | ||
1486 | case APM_SYS_STANDBY: | |
1487 | case APM_USER_STANDBY: | |
1488 | as->standbys_read++; | |
1489 | break; | |
1490 | } | |
1491 | buf += sizeof(event); | |
1492 | i -= sizeof(event); | |
1493 | } | |
1494 | if (i < count) | |
1495 | return count - i; | |
1496 | if (signal_pending(current)) | |
1497 | return -ERESTARTSYS; | |
1498 | return 0; | |
1499 | } | |
1500 | ||
3f4380a1 | 1501 | static unsigned int do_poll(struct file *fp, poll_table *wait) |
1da177e4 | 1502 | { |
3f4380a1 | 1503 | struct apm_user *as; |
1da177e4 LT |
1504 | |
1505 | as = fp->private_data; | |
1506 | if (check_apm_user(as, "poll")) | |
1507 | return 0; | |
1508 | poll_wait(fp, &apm_waitqueue, wait); | |
1509 | if (!queue_empty(as)) | |
1510 | return POLLIN | POLLRDNORM; | |
1511 | return 0; | |
1512 | } | |
1513 | ||
b764a15f | 1514 | static long do_ioctl(struct file *filp, u_int cmd, u_long arg) |
1da177e4 | 1515 | { |
3f4380a1 | 1516 | struct apm_user *as; |
b764a15f | 1517 | int ret; |
1da177e4 LT |
1518 | |
1519 | as = filp->private_data; | |
1520 | if (check_apm_user(as, "ioctl")) | |
1521 | return -EIO; | |
b764a15f | 1522 | if (!as->suser || !as->writer) |
1da177e4 LT |
1523 | return -EPERM; |
1524 | switch (cmd) { | |
1525 | case APM_IOC_STANDBY: | |
05d86412 | 1526 | mutex_lock(&apm_mutex); |
1da177e4 LT |
1527 | if (as->standbys_read > 0) { |
1528 | as->standbys_read--; | |
1529 | as->standbys_pending--; | |
1530 | standbys_pending--; | |
1531 | } else | |
1532 | queue_event(APM_USER_STANDBY, as); | |
1533 | if (standbys_pending <= 0) | |
1534 | standby(); | |
05d86412 | 1535 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1536 | break; |
1537 | case APM_IOC_SUSPEND: | |
05d86412 | 1538 | mutex_lock(&apm_mutex); |
1da177e4 LT |
1539 | if (as->suspends_read > 0) { |
1540 | as->suspends_read--; | |
1541 | as->suspends_pending--; | |
1542 | suspends_pending--; | |
1543 | } else | |
1544 | queue_event(APM_USER_SUSPEND, as); | |
1545 | if (suspends_pending <= 0) { | |
b764a15f | 1546 | ret = suspend(1); |
05d86412 | 1547 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1548 | } else { |
1549 | as->suspend_wait = 1; | |
05d86412 | 1550 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1551 | wait_event_interruptible(apm_suspend_waitqueue, |
1552 | as->suspend_wait == 0); | |
b764a15f | 1553 | ret = as->suspend_result; |
1da177e4 | 1554 | } |
b764a15f | 1555 | return ret; |
1da177e4 | 1556 | default: |
b764a15f | 1557 | return -ENOTTY; |
1da177e4 LT |
1558 | } |
1559 | return 0; | |
1560 | } | |
1561 | ||
3f4380a1 | 1562 | static int do_release(struct inode *inode, struct file *filp) |
1da177e4 | 1563 | { |
3f4380a1 | 1564 | struct apm_user *as; |
1da177e4 LT |
1565 | |
1566 | as = filp->private_data; | |
1567 | if (check_apm_user(as, "release")) | |
1568 | return 0; | |
1569 | filp->private_data = NULL; | |
1570 | if (as->standbys_pending > 0) { | |
1571 | standbys_pending -= as->standbys_pending; | |
1572 | if (standbys_pending <= 0) | |
1573 | standby(); | |
1574 | } | |
1575 | if (as->suspends_pending > 0) { | |
1576 | suspends_pending -= as->suspends_pending; | |
1577 | if (suspends_pending <= 0) | |
1578 | (void) suspend(1); | |
1579 | } | |
3f4380a1 | 1580 | spin_lock(&user_list_lock); |
1da177e4 LT |
1581 | if (user_list == as) |
1582 | user_list = as->next; | |
1583 | else { | |
3f4380a1 | 1584 | struct apm_user *as1; |
1da177e4 LT |
1585 | |
1586 | for (as1 = user_list; | |
1587 | (as1 != NULL) && (as1->next != as); | |
1588 | as1 = as1->next) | |
1589 | ; | |
1590 | if (as1 == NULL) | |
c767a54b | 1591 | pr_err("filp not in user list\n"); |
1da177e4 LT |
1592 | else |
1593 | as1->next = as->next; | |
1594 | } | |
1595 | spin_unlock(&user_list_lock); | |
1596 | kfree(as); | |
1597 | return 0; | |
1598 | } | |
1599 | ||
3f4380a1 | 1600 | static int do_open(struct inode *inode, struct file *filp) |
1da177e4 | 1601 | { |
3f4380a1 | 1602 | struct apm_user *as; |
1da177e4 | 1603 | |
5cbded58 | 1604 | as = kmalloc(sizeof(*as), GFP_KERNEL); |
c767a54b | 1605 | if (as == NULL) |
1da177e4 | 1606 | return -ENOMEM; |
c767a54b | 1607 | |
1da177e4 LT |
1608 | as->magic = APM_BIOS_MAGIC; |
1609 | as->event_tail = as->event_head = 0; | |
1610 | as->suspends_pending = as->standbys_pending = 0; | |
1611 | as->suspends_read = as->standbys_read = 0; | |
1612 | /* | |
1613 | * XXX - this is a tiny bit broken, when we consider BSD | |
3f4380a1 | 1614 | * process accounting. If the device is opened by root, we |
1da177e4 LT |
1615 | * instantly flag that we used superuser privs. Who knows, |
1616 | * we might close the device immediately without doing a | |
1617 | * privileged operation -- cevans | |
1618 | */ | |
1619 | as->suser = capable(CAP_SYS_ADMIN); | |
1620 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; | |
1621 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; | |
1622 | spin_lock(&user_list_lock); | |
1623 | as->next = user_list; | |
1624 | user_list = as; | |
1625 | spin_unlock(&user_list_lock); | |
1626 | filp->private_data = as; | |
1627 | return 0; | |
1628 | } | |
1629 | ||
016d6f35 | 1630 | static int proc_apm_show(struct seq_file *m, void *v) |
1da177e4 | 1631 | { |
1da177e4 LT |
1632 | unsigned short bx; |
1633 | unsigned short cx; | |
1634 | unsigned short dx; | |
1635 | int error; | |
1636 | unsigned short ac_line_status = 0xff; | |
1637 | unsigned short battery_status = 0xff; | |
1638 | unsigned short battery_flag = 0xff; | |
1639 | int percentage = -1; | |
1640 | int time_units = -1; | |
1641 | char *units = "?"; | |
1642 | ||
1da177e4 LT |
1643 | if ((num_online_cpus() == 1) && |
1644 | !(error = apm_get_power_status(&bx, &cx, &dx))) { | |
1645 | ac_line_status = (bx >> 8) & 0xff; | |
1646 | battery_status = bx & 0xff; | |
1647 | if ((cx & 0xff) != 0xff) | |
1648 | percentage = cx & 0xff; | |
1649 | ||
1650 | if (apm_info.connection_version > 0x100) { | |
1651 | battery_flag = (cx >> 8) & 0xff; | |
1652 | if (dx != 0xffff) { | |
1653 | units = (dx & 0x8000) ? "min" : "sec"; | |
1654 | time_units = dx & 0x7fff; | |
1655 | } | |
1656 | } | |
1657 | } | |
1658 | /* Arguments, with symbols from linux/apm_bios.h. Information is | |
1659 | from the Get Power Status (0x0a) call unless otherwise noted. | |
1660 | ||
1661 | 0) Linux driver version (this will change if format changes) | |
1662 | 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. | |
1663 | 2) APM flags from APM Installation Check (0x00): | |
1664 | bit 0: APM_16_BIT_SUPPORT | |
1665 | bit 1: APM_32_BIT_SUPPORT | |
1666 | bit 2: APM_IDLE_SLOWS_CLOCK | |
1667 | bit 3: APM_BIOS_DISABLED | |
1668 | bit 4: APM_BIOS_DISENGAGED | |
1669 | 3) AC line status | |
1670 | 0x00: Off-line | |
1671 | 0x01: On-line | |
1672 | 0x02: On backup power (BIOS >= 1.1 only) | |
1673 | 0xff: Unknown | |
1674 | 4) Battery status | |
1675 | 0x00: High | |
1676 | 0x01: Low | |
1677 | 0x02: Critical | |
1678 | 0x03: Charging | |
1679 | 0x04: Selected battery not present (BIOS >= 1.2 only) | |
1680 | 0xff: Unknown | |
1681 | 5) Battery flag | |
1682 | bit 0: High | |
1683 | bit 1: Low | |
1684 | bit 2: Critical | |
1685 | bit 3: Charging | |
1686 | bit 7: No system battery | |
1687 | 0xff: Unknown | |
1688 | 6) Remaining battery life (percentage of charge): | |
1689 | 0-100: valid | |
1690 | -1: Unknown | |
1691 | 7) Remaining battery life (time units): | |
1692 | Number of remaining minutes or seconds | |
1693 | -1: Unknown | |
1694 | 8) min = minutes; sec = seconds */ | |
1695 | ||
016d6f35 | 1696 | seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", |
3f4380a1 CG |
1697 | driver_version, |
1698 | (apm_info.bios.version >> 8) & 0xff, | |
1699 | apm_info.bios.version & 0xff, | |
1700 | apm_info.bios.flags, | |
1701 | ac_line_status, | |
1702 | battery_status, | |
1703 | battery_flag, | |
1704 | percentage, | |
1705 | time_units, | |
1706 | units); | |
016d6f35 AD |
1707 | return 0; |
1708 | } | |
1da177e4 | 1709 | |
016d6f35 AD |
1710 | static int proc_apm_open(struct inode *inode, struct file *file) |
1711 | { | |
1712 | return single_open(file, proc_apm_show, NULL); | |
1da177e4 LT |
1713 | } |
1714 | ||
016d6f35 AD |
1715 | static const struct file_operations apm_file_ops = { |
1716 | .owner = THIS_MODULE, | |
1717 | .open = proc_apm_open, | |
1718 | .read = seq_read, | |
1719 | .llseek = seq_lseek, | |
1720 | .release = single_release, | |
1721 | }; | |
1722 | ||
1da177e4 LT |
1723 | static int apm(void *unused) |
1724 | { | |
1725 | unsigned short bx; | |
1726 | unsigned short cx; | |
1727 | unsigned short dx; | |
1728 | int error; | |
3f4380a1 CG |
1729 | char *power_stat; |
1730 | char *bat_stat; | |
1da177e4 | 1731 | |
1da177e4 LT |
1732 | /* 2002/08/01 - WT |
1733 | * This is to avoid random crashes at boot time during initialization | |
1734 | * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. | |
1735 | * Some bioses don't like being called from CPU != 0. | |
1736 | * Method suggested by Ingo Molnar. | |
1737 | */ | |
89bd55d1 | 1738 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
1da177e4 | 1739 | BUG_ON(smp_processor_id() != 0); |
1da177e4 LT |
1740 | |
1741 | if (apm_info.connection_version == 0) { | |
1742 | apm_info.connection_version = apm_info.bios.version; | |
1743 | if (apm_info.connection_version > 0x100) { | |
1744 | /* | |
1745 | * We only support BIOSs up to version 1.2 | |
1746 | */ | |
1747 | if (apm_info.connection_version > 0x0102) | |
1748 | apm_info.connection_version = 0x0102; | |
1749 | error = apm_driver_version(&apm_info.connection_version); | |
1750 | if (error != APM_SUCCESS) { | |
1751 | apm_error("driver version", error); | |
1752 | /* Fall back to an APM 1.0 connection. */ | |
1753 | apm_info.connection_version = 0x100; | |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | if (debug) | |
1759 | printk(KERN_INFO "apm: Connection version %d.%d\n", | |
1760 | (apm_info.connection_version >> 8) & 0xff, | |
1761 | apm_info.connection_version & 0xff); | |
1762 | ||
1763 | #ifdef CONFIG_APM_DO_ENABLE | |
1764 | if (apm_info.bios.flags & APM_BIOS_DISABLED) { | |
1765 | /* | |
1766 | * This call causes my NEC UltraLite Versa 33/C to hang if it | |
1767 | * is booted with PM disabled but not in the docking station. | |
1768 | * Unfortunate ... | |
1769 | */ | |
1770 | error = apm_enable_power_management(1); | |
1771 | if (error) { | |
1772 | apm_error("enable power management", error); | |
1773 | return -1; | |
1774 | } | |
1775 | } | |
1776 | #endif | |
1777 | ||
1778 | if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) | |
1779 | && (apm_info.connection_version > 0x0100)) { | |
1780 | error = apm_engage_power_management(APM_DEVICE_ALL, 1); | |
1781 | if (error) { | |
1782 | apm_error("engage power management", error); | |
1783 | return -1; | |
1784 | } | |
1785 | } | |
1786 | ||
3f4380a1 | 1787 | if (debug && (num_online_cpus() == 1 || smp)) { |
1da177e4 LT |
1788 | error = apm_get_power_status(&bx, &cx, &dx); |
1789 | if (error) | |
1790 | printk(KERN_INFO "apm: power status not available\n"); | |
1791 | else { | |
1792 | switch ((bx >> 8) & 0xff) { | |
3f4380a1 CG |
1793 | case 0: |
1794 | power_stat = "off line"; | |
1795 | break; | |
1796 | case 1: | |
1797 | power_stat = "on line"; | |
1798 | break; | |
1799 | case 2: | |
1800 | power_stat = "on backup power"; | |
1801 | break; | |
1802 | default: | |
1803 | power_stat = "unknown"; | |
1804 | break; | |
1da177e4 LT |
1805 | } |
1806 | switch (bx & 0xff) { | |
3f4380a1 CG |
1807 | case 0: |
1808 | bat_stat = "high"; | |
1809 | break; | |
1810 | case 1: | |
1811 | bat_stat = "low"; | |
1812 | break; | |
1813 | case 2: | |
1814 | bat_stat = "critical"; | |
1815 | break; | |
1816 | case 3: | |
1817 | bat_stat = "charging"; | |
1818 | break; | |
1819 | default: | |
1820 | bat_stat = "unknown"; | |
1821 | break; | |
1da177e4 LT |
1822 | } |
1823 | printk(KERN_INFO | |
1824 | "apm: AC %s, battery status %s, battery life ", | |
1825 | power_stat, bat_stat); | |
1826 | if ((cx & 0xff) == 0xff) | |
1827 | printk("unknown\n"); | |
1828 | else | |
1829 | printk("%d%%\n", cx & 0xff); | |
1830 | if (apm_info.connection_version > 0x100) { | |
1831 | printk(KERN_INFO | |
1832 | "apm: battery flag 0x%02x, battery life ", | |
1833 | (cx >> 8) & 0xff); | |
1834 | if (dx == 0xffff) | |
1835 | printk("unknown\n"); | |
1836 | else | |
1837 | printk("%d %s\n", dx & 0x7fff, | |
3f4380a1 CG |
1838 | (dx & 0x8000) ? |
1839 | "minutes" : "seconds"); | |
1da177e4 LT |
1840 | } |
1841 | } | |
1842 | } | |
1843 | ||
1844 | /* Install our power off handler.. */ | |
1845 | if (power_off) | |
1846 | pm_power_off = apm_power_off; | |
1847 | ||
1848 | if (num_online_cpus() == 1 || smp) { | |
1849 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1850 | console_blank_hook = apm_console_blank; | |
1851 | #endif | |
1852 | apm_mainloop(); | |
1853 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1854 | console_blank_hook = NULL; | |
1855 | #endif | |
1856 | } | |
1da177e4 LT |
1857 | |
1858 | return 0; | |
1859 | } | |
1860 | ||
1861 | #ifndef MODULE | |
1862 | static int __init apm_setup(char *str) | |
1863 | { | |
3f4380a1 | 1864 | int invert; |
1da177e4 LT |
1865 | |
1866 | while ((str != NULL) && (*str != '\0')) { | |
1867 | if (strncmp(str, "off", 3) == 0) | |
1868 | apm_disabled = 1; | |
1869 | if (strncmp(str, "on", 2) == 0) | |
1870 | apm_disabled = 0; | |
1871 | if ((strncmp(str, "bounce-interval=", 16) == 0) || | |
1872 | (strncmp(str, "bounce_interval=", 16) == 0)) | |
1873 | bounce_interval = simple_strtol(str + 16, NULL, 0); | |
1874 | if ((strncmp(str, "idle-threshold=", 15) == 0) || | |
1875 | (strncmp(str, "idle_threshold=", 15) == 0)) | |
1876 | idle_threshold = simple_strtol(str + 15, NULL, 0); | |
1877 | if ((strncmp(str, "idle-period=", 12) == 0) || | |
1878 | (strncmp(str, "idle_period=", 12) == 0)) | |
1879 | idle_period = simple_strtol(str + 12, NULL, 0); | |
1880 | invert = (strncmp(str, "no-", 3) == 0) || | |
1881 | (strncmp(str, "no_", 3) == 0); | |
1882 | if (invert) | |
1883 | str += 3; | |
1884 | if (strncmp(str, "debug", 5) == 0) | |
1885 | debug = !invert; | |
1886 | if ((strncmp(str, "power-off", 9) == 0) || | |
1887 | (strncmp(str, "power_off", 9) == 0)) | |
1888 | power_off = !invert; | |
3f4380a1 | 1889 | if (strncmp(str, "smp", 3) == 0) { |
1da177e4 LT |
1890 | smp = !invert; |
1891 | idle_threshold = 100; | |
1892 | } | |
1893 | if ((strncmp(str, "allow-ints", 10) == 0) || | |
1894 | (strncmp(str, "allow_ints", 10) == 0)) | |
3f4380a1 | 1895 | apm_info.allow_ints = !invert; |
1da177e4 LT |
1896 | if ((strncmp(str, "broken-psr", 10) == 0) || |
1897 | (strncmp(str, "broken_psr", 10) == 0)) | |
1898 | apm_info.get_power_status_broken = !invert; | |
1899 | if ((strncmp(str, "realmode-power-off", 18) == 0) || | |
1900 | (strncmp(str, "realmode_power_off", 18) == 0)) | |
1901 | apm_info.realmode_power_off = !invert; | |
1902 | str = strchr(str, ','); | |
1903 | if (str != NULL) | |
1904 | str += strspn(str, ", \t"); | |
1905 | } | |
1906 | return 1; | |
1907 | } | |
1908 | ||
1909 | __setup("apm=", apm_setup); | |
1910 | #endif | |
1911 | ||
5dfe4c96 | 1912 | static const struct file_operations apm_bios_fops = { |
1da177e4 LT |
1913 | .owner = THIS_MODULE, |
1914 | .read = do_read, | |
1915 | .poll = do_poll, | |
b764a15f | 1916 | .unlocked_ioctl = do_ioctl, |
1da177e4 LT |
1917 | .open = do_open, |
1918 | .release = do_release, | |
6038f373 | 1919 | .llseek = noop_llseek, |
1da177e4 LT |
1920 | }; |
1921 | ||
1922 | static struct miscdevice apm_device = { | |
1923 | APM_MINOR_DEV, | |
1924 | "apm_bios", | |
1925 | &apm_bios_fops | |
1926 | }; | |
1927 | ||
1928 | ||
1929 | /* Simple "print if true" callback */ | |
1855256c | 1930 | static int __init print_if_true(const struct dmi_system_id *d) |
1da177e4 LT |
1931 | { |
1932 | printk("%s\n", d->ident); | |
1933 | return 0; | |
1934 | } | |
1935 | ||
1936 | /* | |
1937 | * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was | |
1938 | * disabled before the suspend. Linux used to get terribly confused by that. | |
1939 | */ | |
1855256c | 1940 | static int __init broken_ps2_resume(const struct dmi_system_id *d) |
1da177e4 | 1941 | { |
3f4380a1 CG |
1942 | printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " |
1943 | "workaround hopefully not needed.\n", d->ident); | |
1da177e4 LT |
1944 | return 0; |
1945 | } | |
1946 | ||
1947 | /* Some bioses have a broken protected mode poweroff and need to use realmode */ | |
1855256c | 1948 | static int __init set_realmode_power_off(const struct dmi_system_id *d) |
1da177e4 LT |
1949 | { |
1950 | if (apm_info.realmode_power_off == 0) { | |
1951 | apm_info.realmode_power_off = 1; | |
3f4380a1 CG |
1952 | printk(KERN_INFO "%s bios detected. " |
1953 | "Using realmode poweroff only.\n", d->ident); | |
1da177e4 LT |
1954 | } |
1955 | return 0; | |
1956 | } | |
1957 | ||
1958 | /* Some laptops require interrupts to be enabled during APM calls */ | |
1855256c | 1959 | static int __init set_apm_ints(const struct dmi_system_id *d) |
1da177e4 LT |
1960 | { |
1961 | if (apm_info.allow_ints == 0) { | |
1962 | apm_info.allow_ints = 1; | |
3f4380a1 CG |
1963 | printk(KERN_INFO "%s machine detected. " |
1964 | "Enabling interrupts during APM calls.\n", d->ident); | |
1da177e4 LT |
1965 | } |
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | /* Some APM bioses corrupt memory or just plain do not work */ | |
1855256c | 1970 | static int __init apm_is_horked(const struct dmi_system_id *d) |
1da177e4 LT |
1971 | { |
1972 | if (apm_info.disabled == 0) { | |
1973 | apm_info.disabled = 1; | |
3f4380a1 CG |
1974 | printk(KERN_INFO "%s machine detected. " |
1975 | "Disabling APM.\n", d->ident); | |
1da177e4 LT |
1976 | } |
1977 | return 0; | |
1978 | } | |
1979 | ||
1855256c | 1980 | static int __init apm_is_horked_d850md(const struct dmi_system_id *d) |
1da177e4 LT |
1981 | { |
1982 | if (apm_info.disabled == 0) { | |
1983 | apm_info.disabled = 1; | |
3f4380a1 CG |
1984 | printk(KERN_INFO "%s machine detected. " |
1985 | "Disabling APM.\n", d->ident); | |
3235dc3f FP |
1986 | printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); |
1987 | printk(KERN_INFO "download from support.intel.com\n"); | |
1da177e4 LT |
1988 | } |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | /* Some APM bioses hang on APM idle calls */ | |
1855256c | 1993 | static int __init apm_likes_to_melt(const struct dmi_system_id *d) |
1da177e4 LT |
1994 | { |
1995 | if (apm_info.forbid_idle == 0) { | |
1996 | apm_info.forbid_idle = 1; | |
3f4380a1 CG |
1997 | printk(KERN_INFO "%s machine detected. " |
1998 | "Disabling APM idle calls.\n", d->ident); | |
1da177e4 LT |
1999 | } |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | /* | |
2004 | * Check for clue free BIOS implementations who use | |
2005 | * the following QA technique | |
2006 | * | |
2007 | * [ Write BIOS Code ]<------ | |
2008 | * | ^ | |
2009 | * < Does it Compile >----N-- | |
2010 | * |Y ^ | |
2011 | * < Does it Boot Win98 >-N-- | |
2012 | * |Y | |
2013 | * [Ship It] | |
2014 | * | |
2015 | * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) | |
2016 | * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) | |
2017 | */ | |
1855256c | 2018 | static int __init broken_apm_power(const struct dmi_system_id *d) |
1da177e4 LT |
2019 | { |
2020 | apm_info.get_power_status_broken = 1; | |
3f4380a1 CG |
2021 | printk(KERN_WARNING "BIOS strings suggest APM bugs, " |
2022 | "disabling power status reporting.\n"); | |
1da177e4 LT |
2023 | return 0; |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * This bios swaps the APM minute reporting bytes over (Many sony laptops | |
2028 | * have this problem). | |
2029 | */ | |
1855256c | 2030 | static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) |
1da177e4 LT |
2031 | { |
2032 | apm_info.get_power_status_swabinminutes = 1; | |
3f4380a1 CG |
2033 | printk(KERN_WARNING "BIOS strings suggest APM reports battery life " |
2034 | "in minutes and wrong byte order.\n"); | |
1da177e4 LT |
2035 | return 0; |
2036 | } | |
2037 | ||
2038 | static struct dmi_system_id __initdata apm_dmi_table[] = { | |
2039 | { | |
2040 | print_if_true, | |
2041 | KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", | |
2042 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), | |
2043 | DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, | |
2044 | }, | |
2045 | { /* Handle problems with APM on the C600 */ | |
2046 | broken_ps2_resume, "Dell Latitude C600", | |
2047 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), | |
2048 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, | |
2049 | }, | |
2050 | { /* Allow interrupts during suspend on Dell Latitude laptops*/ | |
2051 | set_apm_ints, "Dell Latitude", | |
2052 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2053 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } | |
2054 | }, | |
2055 | { /* APM crashes */ | |
2056 | apm_is_horked, "Dell Inspiron 2500", | |
2057 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2058 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), | |
3f4380a1 CG |
2059 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
2060 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2061 | }, |
2062 | { /* Allow interrupts during suspend on Dell Inspiron laptops*/ | |
2063 | set_apm_ints, "Dell Inspiron", { | |
2064 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2065 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, | |
2066 | }, | |
2067 | { /* Handle problems with APM on Inspiron 5000e */ | |
2068 | broken_apm_power, "Dell Inspiron 5000e", | |
2069 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2070 | DMI_MATCH(DMI_BIOS_VERSION, "A04"), | |
2071 | DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, | |
2072 | }, | |
2073 | { /* Handle problems with APM on Inspiron 2500 */ | |
2074 | broken_apm_power, "Dell Inspiron 2500", | |
2075 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2076 | DMI_MATCH(DMI_BIOS_VERSION, "A12"), | |
2077 | DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, | |
2078 | }, | |
2079 | { /* APM crashes */ | |
2080 | apm_is_horked, "Dell Dimension 4100", | |
2081 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2082 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), | |
3f4380a1 CG |
2083 | DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), |
2084 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2085 | }, |
2086 | { /* Allow interrupts during suspend on Compaq Laptops*/ | |
2087 | set_apm_ints, "Compaq 12XL125", | |
2088 | { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), | |
2089 | DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), | |
2090 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
3f4380a1 | 2091 | DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, |
1da177e4 LT |
2092 | }, |
2093 | { /* Allow interrupts during APM or the clock goes slow */ | |
2094 | set_apm_ints, "ASUSTeK", | |
2095 | { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
2096 | DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, | |
2097 | }, | |
2098 | { /* APM blows on shutdown */ | |
2099 | apm_is_horked, "ABIT KX7-333[R]", | |
2100 | { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), | |
2101 | DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, | |
2102 | }, | |
2103 | { /* APM crashes */ | |
2104 | apm_is_horked, "Trigem Delhi3", | |
2105 | { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), | |
2106 | DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, | |
2107 | }, | |
2108 | { /* APM crashes */ | |
2109 | apm_is_horked, "Fujitsu-Siemens", | |
2110 | { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), | |
2111 | DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, | |
2112 | }, | |
2113 | { /* APM crashes */ | |
2114 | apm_is_horked_d850md, "Intel D850MD", | |
2115 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2116 | DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, | |
2117 | }, | |
2118 | { /* APM crashes */ | |
2119 | apm_is_horked, "Intel D810EMO", | |
2120 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2121 | DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, | |
2122 | }, | |
2123 | { /* APM crashes */ | |
2124 | apm_is_horked, "Dell XPS-Z", | |
2125 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2126 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), | |
2127 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, | |
2128 | }, | |
2129 | { /* APM crashes */ | |
2130 | apm_is_horked, "Sharp PC-PJ/AX", | |
2131 | { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), | |
2132 | DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), | |
3f4380a1 CG |
2133 | DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), |
2134 | DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, | |
1da177e4 LT |
2135 | }, |
2136 | { /* APM crashes */ | |
2137 | apm_is_horked, "Dell Inspiron 2500", | |
2138 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2139 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), | |
3f4380a1 CG |
2140 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
2141 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2142 | }, |
2143 | { /* APM idle hangs */ | |
2144 | apm_likes_to_melt, "Jabil AMD", | |
2145 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
2146 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, | |
2147 | }, | |
2148 | { /* APM idle hangs */ | |
2149 | apm_likes_to_melt, "AMI Bios", | |
2150 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
2151 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, | |
2152 | }, | |
2153 | { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ | |
2154 | swab_apm_power_in_minutes, "Sony VAIO", | |
2155 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2156 | DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), | |
2157 | DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, | |
2158 | }, | |
2159 | { /* Handle problems with APM on Sony Vaio PCG-N505VX */ | |
2160 | swab_apm_power_in_minutes, "Sony VAIO", | |
2161 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2162 | DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), | |
2163 | DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, | |
2164 | }, | |
2165 | { /* Handle problems with APM on Sony Vaio PCG-XG29 */ | |
2166 | swab_apm_power_in_minutes, "Sony VAIO", | |
2167 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2168 | DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), | |
2169 | DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, | |
2170 | }, | |
2171 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ | |
2172 | swab_apm_power_in_minutes, "Sony VAIO", | |
2173 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2174 | DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), | |
2175 | DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, | |
2176 | }, | |
2177 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ | |
2178 | swab_apm_power_in_minutes, "Sony VAIO", | |
2179 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2180 | DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), | |
2181 | DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, | |
2182 | }, | |
2183 | { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ | |
2184 | swab_apm_power_in_minutes, "Sony VAIO", | |
2185 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2186 | DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), | |
2187 | DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, | |
2188 | }, | |
2189 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ | |
2190 | swab_apm_power_in_minutes, "Sony VAIO", | |
2191 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2192 | DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), | |
2193 | DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, | |
2194 | }, | |
2195 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ | |
2196 | swab_apm_power_in_minutes, "Sony VAIO", | |
2197 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2198 | DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), | |
2199 | DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, | |
2200 | }, | |
2201 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ | |
2202 | swab_apm_power_in_minutes, "Sony VAIO", | |
2203 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2204 | DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), | |
2205 | DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, | |
2206 | }, | |
2207 | { /* Handle problems with APM on Sony Vaio PCG-F104K */ | |
2208 | swab_apm_power_in_minutes, "Sony VAIO", | |
2209 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2210 | DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), | |
2211 | DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, | |
2212 | }, | |
2213 | ||
2214 | { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ | |
2215 | swab_apm_power_in_minutes, "Sony VAIO", | |
2216 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2217 | DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), | |
2218 | DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, | |
2219 | }, | |
2220 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ | |
2221 | swab_apm_power_in_minutes, "Sony VAIO", | |
2222 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2223 | DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), | |
2224 | DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, | |
2225 | }, | |
2226 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ | |
2227 | swab_apm_power_in_minutes, "Sony VAIO", | |
2228 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2229 | DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), | |
2230 | DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, | |
2231 | }, | |
2232 | { /* broken PM poweroff bios */ | |
2233 | set_realmode_power_off, "Award Software v4.60 PGMA", | |
2234 | { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), | |
2235 | DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), | |
2236 | DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, | |
2237 | }, | |
2238 | ||
2239 | /* Generic per vendor APM settings */ | |
2240 | ||
2241 | { /* Allow interrupts during suspend on IBM laptops */ | |
2242 | set_apm_ints, "IBM", | |
2243 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, | |
2244 | }, | |
2245 | ||
2246 | { } | |
2247 | }; | |
2248 | ||
2249 | /* | |
2250 | * Just start the APM thread. We do NOT want to do APM BIOS | |
2251 | * calls from anything but the APM thread, if for no other reason | |
2252 | * than the fact that we don't trust the APM BIOS. This way, | |
2253 | * most common APM BIOS problems that lead to protection errors | |
2254 | * etc will have at least some level of being contained... | |
2255 | * | |
2256 | * In short, if something bad happens, at least we have a choice | |
2257 | * of just killing the apm thread.. | |
2258 | */ | |
2259 | static int __init apm_init(void) | |
2260 | { | |
92f17f01 | 2261 | struct desc_struct *gdt; |
fc09561d | 2262 | int err; |
1da177e4 LT |
2263 | |
2264 | dmi_check_system(apm_dmi_table); | |
2265 | ||
77a9a768 | 2266 | if (apm_info.bios.version == 0 || paravirt_enabled() || machine_is_olpc()) { |
1da177e4 LT |
2267 | printk(KERN_INFO "apm: BIOS not found.\n"); |
2268 | return -ENODEV; | |
2269 | } | |
2270 | printk(KERN_INFO | |
3f4380a1 CG |
2271 | "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", |
2272 | ((apm_info.bios.version >> 8) & 0xff), | |
2273 | (apm_info.bios.version & 0xff), | |
2274 | apm_info.bios.flags, | |
2275 | driver_version); | |
1da177e4 LT |
2276 | if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { |
2277 | printk(KERN_INFO "apm: no 32 bit BIOS support\n"); | |
2278 | return -ENODEV; | |
2279 | } | |
2280 | ||
2281 | if (allow_ints) | |
2282 | apm_info.allow_ints = 1; | |
2283 | if (broken_psr) | |
2284 | apm_info.get_power_status_broken = 1; | |
2285 | if (realmode_power_off) | |
2286 | apm_info.realmode_power_off = 1; | |
2287 | /* User can override, but default is to trust DMI */ | |
2288 | if (apm_disabled != -1) | |
2289 | apm_info.disabled = apm_disabled; | |
2290 | ||
2291 | /* | |
2292 | * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 | |
2293 | * but is reportedly a 1.0 BIOS. | |
2294 | */ | |
2295 | if (apm_info.bios.version == 0x001) | |
2296 | apm_info.bios.version = 0x100; | |
2297 | ||
2298 | /* BIOS < 1.2 doesn't set cseg_16_len */ | |
2299 | if (apm_info.bios.version < 0x102) | |
2300 | apm_info.bios.cseg_16_len = 0; /* 64k */ | |
2301 | ||
2302 | if (debug) { | |
07a30460 | 2303 | printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", |
1da177e4 LT |
2304 | apm_info.bios.cseg, apm_info.bios.offset, |
2305 | apm_info.bios.cseg_16, apm_info.bios.dseg); | |
2306 | if (apm_info.bios.version > 0x100) | |
2307 | printk(" cseg len %x, dseg len %x", | |
2308 | apm_info.bios.cseg_len, | |
2309 | apm_info.bios.dseg_len); | |
2310 | if (apm_info.bios.version > 0x101) | |
2311 | printk(" cseg16 len %x", apm_info.bios.cseg_16_len); | |
2312 | printk("\n"); | |
2313 | } | |
2314 | ||
2315 | if (apm_info.disabled) { | |
c767a54b | 2316 | pr_notice("disabled on user request.\n"); |
1da177e4 LT |
2317 | return -ENODEV; |
2318 | } | |
2319 | if ((num_online_cpus() > 1) && !power_off && !smp) { | |
c767a54b | 2320 | pr_notice("disabled - APM is not SMP safe.\n"); |
1da177e4 LT |
2321 | apm_info.disabled = 1; |
2322 | return -ENODEV; | |
2323 | } | |
6831c6ed | 2324 | if (!acpi_disabled) { |
c767a54b | 2325 | pr_notice("overridden by ACPI.\n"); |
1da177e4 LT |
2326 | apm_info.disabled = 1; |
2327 | return -ENODEV; | |
2328 | } | |
1da177e4 | 2329 | |
3012d2d2 ZA |
2330 | /* |
2331 | * Set up the long jump entry point to the APM BIOS, which is called | |
2332 | * from inline assembly. | |
2333 | */ | |
1da177e4 LT |
2334 | apm_bios_entry.offset = apm_info.bios.offset; |
2335 | apm_bios_entry.segment = APM_CS; | |
2336 | ||
3012d2d2 ZA |
2337 | /* |
2338 | * The APM 1.1 BIOS is supposed to provide limit information that it | |
2339 | * recognizes. Many machines do this correctly, but many others do | |
2340 | * not restrict themselves to their claimed limit. When this happens, | |
2341 | * they will cause a segmentation violation in the kernel at boot time. | |
2342 | * Most BIOS's, however, will respect a 64k limit, so we use that. | |
92f17f01 ZA |
2343 | * |
2344 | * Note we only set APM segments on CPU zero, since we pin the APM | |
2345 | * code to that CPU. | |
3012d2d2 | 2346 | */ |
92f17f01 | 2347 | gdt = get_cpu_gdt_table(0); |
57594742 AM |
2348 | set_desc_base(&gdt[APM_CS >> 3], |
2349 | (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); | |
2350 | set_desc_base(&gdt[APM_CS_16 >> 3], | |
2351 | (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); | |
2352 | set_desc_base(&gdt[APM_DS >> 3], | |
2353 | (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); | |
1da177e4 | 2354 | |
11ae9dd4 | 2355 | proc_create("apm", 0, NULL, &apm_file_ops); |
1da177e4 | 2356 | |
fc09561d SH |
2357 | kapmd_task = kthread_create(apm, NULL, "kapmd"); |
2358 | if (IS_ERR(kapmd_task)) { | |
c767a54b | 2359 | pr_err("disabled - Unable to start kernel thread\n"); |
fc09561d SH |
2360 | err = PTR_ERR(kapmd_task); |
2361 | kapmd_task = NULL; | |
c94a62aa | 2362 | remove_proc_entry("apm", NULL); |
fc09561d | 2363 | return err; |
1da177e4 | 2364 | } |
fc09561d | 2365 | wake_up_process(kapmd_task); |
1da177e4 | 2366 | |
3f4380a1 | 2367 | if (num_online_cpus() > 1 && !smp) { |
1da177e4 | 2368 | printk(KERN_NOTICE |
3f4380a1 | 2369 | "apm: disabled - APM is not SMP safe (power off active).\n"); |
1da177e4 LT |
2370 | return 0; |
2371 | } | |
2372 | ||
c94a62aa NH |
2373 | /* |
2374 | * Note we don't actually care if the misc_device cannot be registered. | |
2375 | * this driver can do its job without it, even if userspace can't | |
2376 | * control it. just log the error | |
2377 | */ | |
2378 | if (misc_register(&apm_device)) | |
2379 | printk(KERN_WARNING "apm: Could not register misc device.\n"); | |
1da177e4 LT |
2380 | |
2381 | if (HZ != 100) | |
2382 | idle_period = (idle_period * HZ) / 100; | |
2383 | if (idle_threshold < 100) { | |
2384 | original_pm_idle = pm_idle; | |
2385 | pm_idle = apm_cpu_idle; | |
2386 | set_pm_idle = 1; | |
2387 | } | |
2388 | ||
2389 | return 0; | |
2390 | } | |
2391 | ||
2392 | static void __exit apm_exit(void) | |
2393 | { | |
3f4380a1 | 2394 | int error; |
1da177e4 LT |
2395 | |
2396 | if (set_pm_idle) { | |
2397 | pm_idle = original_pm_idle; | |
2398 | /* | |
2399 | * We are about to unload the current idle thread pm callback | |
2400 | * (pm_idle), Wait for all processors to update cached/local | |
2401 | * copies of pm_idle before proceeding. | |
2402 | */ | |
85f7f656 | 2403 | kick_all_cpus_sync(); |
1da177e4 LT |
2404 | } |
2405 | if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) | |
2406 | && (apm_info.connection_version > 0x0100)) { | |
2407 | error = apm_engage_power_management(APM_DEVICE_ALL, 0); | |
2408 | if (error) | |
2409 | apm_error("disengage power management", error); | |
2410 | } | |
2411 | misc_deregister(&apm_device); | |
2412 | remove_proc_entry("apm", NULL); | |
2413 | if (power_off) | |
2414 | pm_power_off = NULL; | |
fc09561d SH |
2415 | if (kapmd_task) { |
2416 | kthread_stop(kapmd_task); | |
2417 | kapmd_task = NULL; | |
2418 | } | |
1da177e4 LT |
2419 | } |
2420 | ||
2421 | module_init(apm_init); | |
2422 | module_exit(apm_exit); | |
2423 | ||
2424 | MODULE_AUTHOR("Stephen Rothwell"); | |
2425 | MODULE_DESCRIPTION("Advanced Power Management"); | |
2426 | MODULE_LICENSE("GPL"); | |
2427 | module_param(debug, bool, 0644); | |
2428 | MODULE_PARM_DESC(debug, "Enable debug mode"); | |
2429 | module_param(power_off, bool, 0444); | |
2430 | MODULE_PARM_DESC(power_off, "Enable power off"); | |
2431 | module_param(bounce_interval, int, 0444); | |
2432 | MODULE_PARM_DESC(bounce_interval, | |
2433 | "Set the number of ticks to ignore suspend bounces"); | |
2434 | module_param(allow_ints, bool, 0444); | |
2435 | MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); | |
2436 | module_param(broken_psr, bool, 0444); | |
2437 | MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); | |
2438 | module_param(realmode_power_off, bool, 0444); | |
2439 | MODULE_PARM_DESC(realmode_power_off, | |
2440 | "Switch to real mode before powering off"); | |
2441 | module_param(idle_threshold, int, 0444); | |
2442 | MODULE_PARM_DESC(idle_threshold, | |
2443 | "System idle percentage above which to make APM BIOS idle calls"); | |
2444 | module_param(idle_period, int, 0444); | |
2445 | MODULE_PARM_DESC(idle_period, | |
2446 | "Period (in sec/100) over which to caculate the idle percentage"); | |
2447 | module_param(smp, bool, 0444); | |
2448 | MODULE_PARM_DESC(smp, | |
2449 | "Set this to enable APM use on an SMP platform. Use with caution on older systems"); | |
2450 | MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); |