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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> | |
174cd4b1 | 221 | #include <linux/sched/signal.h> |
32ef5517 | 222 | #include <linux/sched/cputime.h> |
1da177e4 | 223 | #include <linux/pm.h> |
a9415644 | 224 | #include <linux/capability.h> |
1da177e4 LT |
225 | #include <linux/device.h> |
226 | #include <linux/kernel.h> | |
83144186 | 227 | #include <linux/freezer.h> |
1da177e4 | 228 | #include <linux/smp.h> |
1da177e4 LT |
229 | #include <linux/dmi.h> |
230 | #include <linux/suspend.h> | |
fc09561d | 231 | #include <linux/kthread.h> |
4f2479f0 | 232 | #include <linux/jiffies.h> |
6831c6ed | 233 | #include <linux/acpi.h> |
19234c08 | 234 | #include <linux/syscore_ops.h> |
334955ef | 235 | #include <linux/i8253.h> |
dd8af076 | 236 | #include <linux/cpuidle.h> |
1da177e4 | 237 | |
7c0f6ba6 | 238 | #include <linux/uaccess.h> |
1da177e4 | 239 | #include <asm/desc.h> |
77a9a768 | 240 | #include <asm/olpc.h> |
6020c8f3 | 241 | #include <asm/paravirt.h> |
07f3331c | 242 | #include <asm/reboot.h> |
6f6060a5 | 243 | #include <asm/nospec-branch.h> |
1da177e4 | 244 | |
1da177e4 LT |
245 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
246 | extern int (*console_blank_hook)(int); | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * The apm_bios device is one of the misc char devices. | |
251 | * This is its minor number. | |
252 | */ | |
253 | #define APM_MINOR_DEV 134 | |
254 | ||
255 | /* | |
1da177e4 LT |
256 | * Various options can be changed at boot time as follows: |
257 | * (We allow underscores for compatibility with the modules code) | |
258 | * apm=on/off enable/disable APM | |
259 | * [no-]allow[-_]ints allow interrupts during BIOS calls | |
260 | * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call | |
261 | * [no-]realmode[-_]power[-_]off switch to real mode before | |
262 | * powering off | |
263 | * [no-]debug log some debugging messages | |
264 | * [no-]power[-_]off power off on shutdown | |
265 | * [no-]smp Use apm even on an SMP box | |
266 | * bounce[-_]interval=<n> number of ticks to ignore suspend | |
267 | * bounces | |
268 | * idle[-_]threshold=<n> System idle percentage above which to | |
269 | * make APM BIOS idle calls. Set it to | |
270 | * 100 to disable. | |
271 | * idle[-_]period=<n> Period (in 1/100s of a second) over | |
272 | * which the idle percentage is | |
273 | * calculated. | |
274 | */ | |
275 | ||
276 | /* KNOWN PROBLEM MACHINES: | |
277 | * | |
278 | * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant | |
279 | * [Confirmed by TI representative] | |
280 | * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification | |
281 | * [Confirmed by BIOS disassembly] | |
282 | * [This may work now ...] | |
283 | * P: Toshiba 1950S: battery life information only gets updated after resume | |
284 | * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking | |
285 | * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] | |
286 | * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP | |
287 | * Neale Banks <neale@lowendale.com.au> December 2000 | |
288 | * | |
289 | * Legend: U = unusable with APM patches | |
290 | * P = partially usable with APM patches | |
291 | */ | |
292 | ||
293 | /* | |
294 | * Define as 1 to make the driver always call the APM BIOS busy | |
295 | * routine even if the clock was not reported as slowed by the | |
296 | * idle routine. Otherwise, define as 0. | |
297 | */ | |
298 | #define ALWAYS_CALL_BUSY 1 | |
299 | ||
300 | /* | |
301 | * Define to make the APM BIOS calls zero all data segment registers (so | |
302 | * that an incorrect BIOS implementation will cause a kernel panic if it | |
303 | * tries to write to arbitrary memory). | |
304 | */ | |
305 | #define APM_ZERO_SEGS | |
306 | ||
1164dd00 | 307 | #include <asm/apm.h> |
1da177e4 | 308 | |
1da177e4 LT |
309 | /* |
310 | * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. | |
311 | * This patched by Chad Miller <cmiller@surfsouth.com>, original code by | |
312 | * David Chen <chen@ctpa04.mit.edu> | |
313 | */ | |
314 | #undef INIT_TIMER_AFTER_SUSPEND | |
315 | ||
316 | #ifdef INIT_TIMER_AFTER_SUSPEND | |
317 | #include <linux/timex.h> | |
318 | #include <asm/io.h> | |
319 | #include <linux/delay.h> | |
320 | #endif | |
321 | ||
322 | /* | |
323 | * Need to poll the APM BIOS every second | |
324 | */ | |
325 | #define APM_CHECK_TIMEOUT (HZ) | |
326 | ||
327 | /* | |
328 | * Ignore suspend events for this amount of time after a resume | |
329 | */ | |
3f4380a1 | 330 | #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) |
1da177e4 LT |
331 | |
332 | /* | |
333 | * Maximum number of events stored | |
334 | */ | |
335 | #define APM_MAX_EVENTS 20 | |
336 | ||
337 | /* | |
338 | * The per-file APM data | |
339 | */ | |
340 | struct apm_user { | |
341 | int magic; | |
3f4380a1 | 342 | struct apm_user *next; |
77617bd8 DP |
343 | unsigned int suser: 1; |
344 | unsigned int writer: 1; | |
345 | unsigned int reader: 1; | |
346 | unsigned int suspend_wait: 1; | |
1da177e4 LT |
347 | int suspend_result; |
348 | int suspends_pending; | |
349 | int standbys_pending; | |
350 | int suspends_read; | |
351 | int standbys_read; | |
352 | int event_head; | |
353 | int event_tail; | |
354 | apm_event_t events[APM_MAX_EVENTS]; | |
355 | }; | |
356 | ||
357 | /* | |
358 | * The magic number in apm_user | |
359 | */ | |
360 | #define APM_BIOS_MAGIC 0x4101 | |
361 | ||
362 | /* | |
363 | * idle percentage above which bios idle calls are done | |
364 | */ | |
365 | #ifdef CONFIG_APM_CPU_IDLE | |
366 | #define DEFAULT_IDLE_THRESHOLD 95 | |
367 | #else | |
368 | #define DEFAULT_IDLE_THRESHOLD 100 | |
369 | #endif | |
370 | #define DEFAULT_IDLE_PERIOD (100 / 3) | |
371 | ||
dd8af076 LB |
372 | static int apm_cpu_idle(struct cpuidle_device *dev, |
373 | struct cpuidle_driver *drv, int index); | |
374 | ||
375 | static struct cpuidle_driver apm_idle_driver = { | |
376 | .name = "apm_idle", | |
377 | .owner = THIS_MODULE, | |
dd8af076 LB |
378 | .states = { |
379 | { /* entry 0 is for polling */ }, | |
380 | { /* entry 1 is for APM idle */ | |
381 | .name = "APM", | |
382 | .desc = "APM idle", | |
dd8af076 LB |
383 | .exit_latency = 250, /* WAG */ |
384 | .target_residency = 500, /* WAG */ | |
385 | .enter = &apm_cpu_idle | |
386 | }, | |
387 | }, | |
388 | .state_count = 2, | |
389 | }; | |
390 | ||
391 | static struct cpuidle_device apm_cpuidle_device; | |
392 | ||
1da177e4 LT |
393 | /* |
394 | * Local variables | |
395 | */ | |
54c2f3fd | 396 | __visible struct { |
1da177e4 LT |
397 | unsigned long offset; |
398 | unsigned short segment; | |
3f4380a1 CG |
399 | } apm_bios_entry; |
400 | static int clock_slowed; | |
401 | static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; | |
402 | static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; | |
3f4380a1 CG |
403 | static int suspends_pending; |
404 | static int standbys_pending; | |
405 | static int ignore_sys_suspend; | |
406 | static int ignore_normal_resume; | |
407 | static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; | |
408 | ||
476bc001 RR |
409 | static bool debug __read_mostly; |
410 | static bool smp __read_mostly; | |
3f4380a1 | 411 | static int apm_disabled = -1; |
1da177e4 | 412 | #ifdef CONFIG_SMP |
476bc001 | 413 | static bool power_off; |
1da177e4 | 414 | #else |
476bc001 | 415 | static bool power_off = 1; |
1da177e4 | 416 | #endif |
476bc001 | 417 | static bool realmode_power_off; |
1da177e4 | 418 | #ifdef CONFIG_APM_ALLOW_INTS |
476bc001 | 419 | static bool allow_ints = 1; |
1da177e4 | 420 | #else |
476bc001 | 421 | static bool allow_ints; |
1da177e4 | 422 | #endif |
476bc001 | 423 | static bool broken_psr; |
1da177e4 LT |
424 | |
425 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); | |
426 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); | |
3f4380a1 | 427 | static struct apm_user *user_list; |
1da177e4 | 428 | static DEFINE_SPINLOCK(user_list_lock); |
05d86412 | 429 | static DEFINE_MUTEX(apm_mutex); |
c7425314 AM |
430 | |
431 | /* | |
432 | * Set up a segment that references the real mode segment 0x40 | |
433 | * that extends up to the end of page zero (that we have reserved). | |
434 | * This is for buggy BIOS's that refer to (real mode) segment 0x40 | |
435 | * even though they are called in protected mode. | |
436 | */ | |
437 | static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, | |
438 | (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); | |
1da177e4 | 439 | |
3f4380a1 | 440 | static const char driver_version[] = "1.16ac"; /* no spaces */ |
1da177e4 | 441 | |
fc09561d SH |
442 | static struct task_struct *kapmd_task; |
443 | ||
1da177e4 LT |
444 | /* |
445 | * APM event names taken from the APM 1.2 specification. These are | |
446 | * the message codes that the BIOS uses to tell us about events | |
447 | */ | |
3f4380a1 | 448 | static const char * const apm_event_name[] = { |
1da177e4 LT |
449 | "system standby", |
450 | "system suspend", | |
451 | "normal resume", | |
452 | "critical resume", | |
453 | "low battery", | |
454 | "power status change", | |
455 | "update time", | |
456 | "critical suspend", | |
457 | "user standby", | |
458 | "user suspend", | |
459 | "system standby resume", | |
460 | "capabilities change" | |
461 | }; | |
38e548ee | 462 | #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) |
1da177e4 LT |
463 | |
464 | typedef struct lookup_t { | |
465 | int key; | |
3f4380a1 | 466 | char *msg; |
1da177e4 LT |
467 | } lookup_t; |
468 | ||
469 | /* | |
470 | * The BIOS returns a set of standard error codes in AX when the | |
471 | * carry flag is set. | |
472 | */ | |
3f4380a1 | 473 | |
1da177e4 LT |
474 | static const lookup_t error_table[] = { |
475 | /* N/A { APM_SUCCESS, "Operation succeeded" }, */ | |
476 | { APM_DISABLED, "Power management disabled" }, | |
477 | { APM_CONNECTED, "Real mode interface already connected" }, | |
478 | { APM_NOT_CONNECTED, "Interface not connected" }, | |
479 | { APM_16_CONNECTED, "16 bit interface already connected" }, | |
480 | /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ | |
481 | { APM_32_CONNECTED, "32 bit interface already connected" }, | |
482 | { APM_32_UNSUPPORTED, "32 bit interface not supported" }, | |
483 | { APM_BAD_DEVICE, "Unrecognized device ID" }, | |
484 | { APM_BAD_PARAM, "Parameter out of range" }, | |
485 | { APM_NOT_ENGAGED, "Interface not engaged" }, | |
486 | { APM_BAD_FUNCTION, "Function not supported" }, | |
487 | { APM_RESUME_DISABLED, "Resume timer disabled" }, | |
488 | { APM_BAD_STATE, "Unable to enter requested state" }, | |
489 | /* N/A { APM_NO_EVENTS, "No events pending" }, */ | |
490 | { APM_NO_ERROR, "BIOS did not set a return code" }, | |
491 | { APM_NOT_PRESENT, "No APM present" } | |
492 | }; | |
38e548ee | 493 | #define ERROR_COUNT ARRAY_SIZE(error_table) |
1da177e4 LT |
494 | |
495 | /** | |
496 | * apm_error - display an APM error | |
497 | * @str: information string | |
498 | * @err: APM BIOS return code | |
499 | * | |
500 | * Write a meaningful log entry to the kernel log in the event of | |
89bd55d1 | 501 | * an APM error. Note that this also handles (negative) kernel errors. |
1da177e4 | 502 | */ |
3f4380a1 | 503 | |
1da177e4 LT |
504 | static void apm_error(char *str, int err) |
505 | { | |
3f4380a1 | 506 | int i; |
1da177e4 LT |
507 | |
508 | for (i = 0; i < ERROR_COUNT; i++) | |
3f4380a1 CG |
509 | if (error_table[i].key == err) |
510 | break; | |
1da177e4 | 511 | if (i < ERROR_COUNT) |
c767a54b | 512 | pr_notice("%s: %s\n", str, error_table[i].msg); |
89bd55d1 | 513 | else if (err < 0) |
c767a54b | 514 | pr_notice("%s: linux error code %i\n", str, err); |
1da177e4 | 515 | else |
c767a54b | 516 | pr_notice("%s: unknown error code %#2.2x\n", |
3f4380a1 | 517 | str, err); |
1da177e4 LT |
518 | } |
519 | ||
1da177e4 LT |
520 | /* |
521 | * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and | |
522 | * apm_info.allow_ints, we are being really paranoid here! Not only | |
523 | * are interrupts disabled, but all the segment registers (except SS) | |
524 | * are saved and zeroed this means that if the BIOS tries to reference | |
525 | * any data without explicitly loading the segment registers, the kernel | |
526 | * will fault immediately rather than have some unforeseen circumstances | |
527 | * for the rest of the kernel. And it will be very obvious! :-) Doing | |
528 | * this depends on CS referring to the same physical memory as DS so that | |
529 | * DS can be zeroed before the call. Unfortunately, we can't do anything | |
530 | * about the stack segment/pointer. Also, we tell the compiler that | |
531 | * everything could change. | |
532 | * | |
533 | * Also, we KNOW that for the non error case of apm_bios_call, there | |
534 | * is no useful data returned in the low order 8 bits of eax. | |
535 | */ | |
3864c489 PZ |
536 | |
537 | static inline unsigned long __apm_irq_save(void) | |
538 | { | |
539 | unsigned long flags; | |
540 | local_save_flags(flags); | |
541 | if (apm_info.allow_ints) { | |
542 | if (irqs_disabled_flags(flags)) | |
543 | local_irq_enable(); | |
544 | } else | |
545 | local_irq_disable(); | |
546 | ||
547 | return flags; | |
548 | } | |
549 | ||
550 | #define apm_irq_save(flags) \ | |
551 | do { flags = __apm_irq_save(); } while (0) | |
552 | ||
553 | static inline void apm_irq_restore(unsigned long flags) | |
554 | { | |
555 | if (irqs_disabled_flags(flags)) | |
1da177e4 | 556 | local_irq_disable(); |
3864c489 PZ |
557 | else if (irqs_disabled()) |
558 | local_irq_enable(); | |
559 | } | |
1da177e4 LT |
560 | |
561 | #ifdef APM_ZERO_SEGS | |
562 | # define APM_DECL_SEGS \ | |
563 | unsigned int saved_fs; unsigned int saved_gs; | |
564 | # define APM_DO_SAVE_SEGS \ | |
565 | savesegment(fs, saved_fs); savesegment(gs, saved_gs) | |
566 | # define APM_DO_RESTORE_SEGS \ | |
567 | loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) | |
568 | #else | |
569 | # define APM_DECL_SEGS | |
570 | # define APM_DO_SAVE_SEGS | |
571 | # define APM_DO_RESTORE_SEGS | |
572 | #endif | |
573 | ||
89bd55d1 RR |
574 | struct apm_bios_call { |
575 | u32 func; | |
576 | /* In and out */ | |
577 | u32 ebx; | |
578 | u32 ecx; | |
579 | /* Out only */ | |
580 | u32 eax; | |
581 | u32 edx; | |
582 | u32 esi; | |
583 | ||
584 | /* Error: -ENOMEM, or bits 8-15 of eax */ | |
585 | int err; | |
586 | }; | |
587 | ||
1da177e4 | 588 | /** |
89bd55d1 RR |
589 | * __apm_bios_call - Make an APM BIOS 32bit call |
590 | * @_call: pointer to struct apm_bios_call. | |
1da177e4 LT |
591 | * |
592 | * Make an APM call using the 32bit protected mode interface. The | |
593 | * caller is responsible for knowing if APM BIOS is configured and | |
594 | * enabled. This call can disable interrupts for a long period of | |
595 | * time on some laptops. The return value is in AH and the carry | |
596 | * flag is loaded into AL. If there is an error, then the error | |
597 | * code is returned in AH (bits 8-15 of eax) and this function | |
598 | * returns non-zero. | |
89bd55d1 RR |
599 | * |
600 | * Note: this makes the call on the current CPU. | |
1da177e4 | 601 | */ |
89bd55d1 | 602 | static long __apm_bios_call(void *_call) |
1da177e4 LT |
603 | { |
604 | APM_DECL_SEGS | |
605 | unsigned long flags; | |
1da177e4 LT |
606 | int cpu; |
607 | struct desc_struct save_desc_40; | |
251e6912 | 608 | struct desc_struct *gdt; |
89bd55d1 | 609 | struct apm_bios_call *call = _call; |
3f4380a1 | 610 | |
1da177e4 | 611 | cpu = get_cpu(); |
89bd55d1 | 612 | BUG_ON(cpu != 0); |
69218e47 | 613 | gdt = get_cpu_gdt_rw(cpu); |
251e6912 ZA |
614 | save_desc_40 = gdt[0x40 / 8]; |
615 | gdt[0x40 / 8] = bad_bios_desc; | |
1da177e4 | 616 | |
3864c489 | 617 | apm_irq_save(flags); |
6f6060a5 | 618 | firmware_restrict_branch_speculation_start(); |
1da177e4 | 619 | APM_DO_SAVE_SEGS; |
89bd55d1 RR |
620 | apm_bios_call_asm(call->func, call->ebx, call->ecx, |
621 | &call->eax, &call->ebx, &call->ecx, &call->edx, | |
622 | &call->esi); | |
1da177e4 | 623 | APM_DO_RESTORE_SEGS; |
6f6060a5 | 624 | firmware_restrict_branch_speculation_end(); |
3864c489 | 625 | apm_irq_restore(flags); |
251e6912 | 626 | gdt[0x40 / 8] = save_desc_40; |
1da177e4 | 627 | put_cpu(); |
3f4380a1 | 628 | |
89bd55d1 RR |
629 | return call->eax & 0xff; |
630 | } | |
631 | ||
632 | /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ | |
633 | static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) | |
634 | { | |
635 | int ret; | |
636 | ||
637 | /* Don't bother with work_on_cpu in the common case, so we don't | |
638 | * have to worry about OOM or overhead. */ | |
639 | if (get_cpu() == 0) { | |
640 | ret = fn(call); | |
641 | put_cpu(); | |
642 | } else { | |
643 | put_cpu(); | |
644 | ret = work_on_cpu(0, fn, call); | |
645 | } | |
646 | ||
647 | /* work_on_cpu can fail with -ENOMEM */ | |
648 | if (ret < 0) | |
649 | call->err = ret; | |
650 | else | |
651 | call->err = (call->eax >> 8) & 0xff; | |
652 | ||
653 | return ret; | |
1da177e4 LT |
654 | } |
655 | ||
656 | /** | |
89bd55d1 RR |
657 | * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) |
658 | * @call: the apm_bios_call registers. | |
659 | * | |
660 | * If there is an error, it is returned in @call.err. | |
661 | */ | |
662 | static int apm_bios_call(struct apm_bios_call *call) | |
663 | { | |
664 | return on_cpu0(__apm_bios_call, call); | |
665 | } | |
666 | ||
667 | /** | |
668 | * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) | |
669 | * @_call: pointer to struct apm_bios_call. | |
1da177e4 | 670 | * |
87af2ffd | 671 | * Make a BIOS call that returns one value only, or just status. |
1da177e4 | 672 | * If there is an error, then the error code is returned in AH |
89bd55d1 RR |
673 | * (bits 8-15 of eax) and this function returns non-zero (it can |
674 | * also return -ENOMEM). This is used for simpler BIOS operations. | |
675 | * This call may hold interrupts off for a long time on some laptops. | |
676 | * | |
677 | * Note: this makes the call on the current CPU. | |
1da177e4 | 678 | */ |
89bd55d1 | 679 | static long __apm_bios_call_simple(void *_call) |
1da177e4 LT |
680 | { |
681 | u8 error; | |
682 | APM_DECL_SEGS | |
683 | unsigned long flags; | |
1da177e4 LT |
684 | int cpu; |
685 | struct desc_struct save_desc_40; | |
251e6912 | 686 | struct desc_struct *gdt; |
89bd55d1 | 687 | struct apm_bios_call *call = _call; |
3f4380a1 | 688 | |
1da177e4 | 689 | cpu = get_cpu(); |
89bd55d1 | 690 | BUG_ON(cpu != 0); |
69218e47 | 691 | gdt = get_cpu_gdt_rw(cpu); |
251e6912 ZA |
692 | save_desc_40 = gdt[0x40 / 8]; |
693 | gdt[0x40 / 8] = bad_bios_desc; | |
1da177e4 | 694 | |
3864c489 | 695 | apm_irq_save(flags); |
6f6060a5 | 696 | firmware_restrict_branch_speculation_start(); |
1da177e4 | 697 | APM_DO_SAVE_SEGS; |
89bd55d1 RR |
698 | error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, |
699 | &call->eax); | |
1da177e4 | 700 | APM_DO_RESTORE_SEGS; |
6f6060a5 | 701 | firmware_restrict_branch_speculation_end(); |
3864c489 | 702 | apm_irq_restore(flags); |
251e6912 | 703 | gdt[0x40 / 8] = save_desc_40; |
1da177e4 | 704 | put_cpu(); |
1da177e4 LT |
705 | return error; |
706 | } | |
707 | ||
89bd55d1 RR |
708 | /** |
709 | * apm_bios_call_simple - make a simple APM BIOS 32bit call | |
710 | * @func: APM function to invoke | |
711 | * @ebx_in: EBX register value for BIOS call | |
712 | * @ecx_in: ECX register value for BIOS call | |
713 | * @eax: EAX register on return from the BIOS call | |
714 | * @err: bits | |
715 | * | |
716 | * Make a BIOS call that returns one value only, or just status. | |
717 | * If there is an error, then the error code is returned in @err | |
718 | * and this function returns non-zero. This is used for simpler | |
719 | * BIOS operations. This call may hold interrupts off for a long | |
720 | * time on some laptops. | |
721 | */ | |
722 | static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, | |
723 | int *err) | |
724 | { | |
725 | struct apm_bios_call call; | |
726 | int ret; | |
727 | ||
728 | call.func = func; | |
729 | call.ebx = ebx_in; | |
730 | call.ecx = ecx_in; | |
731 | ||
732 | ret = on_cpu0(__apm_bios_call_simple, &call); | |
733 | *eax = call.eax; | |
734 | *err = call.err; | |
735 | return ret; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | /** |
739 | * apm_driver_version - APM driver version | |
740 | * @val: loaded with the APM version on return | |
741 | * | |
742 | * Retrieve the APM version supported by the BIOS. This is only | |
743 | * supported for APM 1.1 or higher. An error indicates APM 1.0 is | |
744 | * probably present. | |
745 | * | |
746 | * On entry val should point to a value indicating the APM driver | |
747 | * version with the high byte being the major and the low byte the | |
748 | * minor number both in BCD | |
749 | * | |
750 | * On return it will hold the BIOS revision supported in the | |
751 | * same format. | |
752 | */ | |
753 | ||
754 | static int apm_driver_version(u_short *val) | |
755 | { | |
3f4380a1 | 756 | u32 eax; |
89bd55d1 | 757 | int err; |
1da177e4 | 758 | |
89bd55d1 RR |
759 | if (apm_bios_call_simple(APM_FUNC_VERSION, 0, *val, &eax, &err)) |
760 | return err; | |
1da177e4 LT |
761 | *val = eax; |
762 | return APM_SUCCESS; | |
763 | } | |
764 | ||
765 | /** | |
766 | * apm_get_event - get an APM event from the BIOS | |
767 | * @event: pointer to the event | |
768 | * @info: point to the event information | |
769 | * | |
770 | * The APM BIOS provides a polled information for event | |
771 | * reporting. The BIOS expects to be polled at least every second | |
772 | * when events are pending. When a message is found the caller should | |
773 | * poll until no more messages are present. However, this causes | |
774 | * problems on some laptops where a suspend event notification is | |
775 | * not cleared until it is acknowledged. | |
776 | * | |
777 | * Additional information is returned in the info pointer, providing | |
778 | * that APM 1.2 is in use. If no messges are pending the value 0x80 | |
779 | * is returned (No power management events pending). | |
780 | */ | |
1da177e4 LT |
781 | static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) |
782 | { | |
89bd55d1 | 783 | struct apm_bios_call call; |
1da177e4 | 784 | |
89bd55d1 RR |
785 | call.func = APM_FUNC_GET_EVENT; |
786 | call.ebx = call.ecx = 0; | |
787 | ||
788 | if (apm_bios_call(&call)) | |
789 | return call.err; | |
790 | ||
791 | *event = call.ebx; | |
1da177e4 LT |
792 | if (apm_info.connection_version < 0x0102) |
793 | *info = ~0; /* indicate info not valid */ | |
794 | else | |
89bd55d1 | 795 | *info = call.ecx; |
1da177e4 LT |
796 | return APM_SUCCESS; |
797 | } | |
798 | ||
799 | /** | |
800 | * set_power_state - set the power management state | |
801 | * @what: which items to transition | |
802 | * @state: state to transition to | |
803 | * | |
804 | * Request an APM change of state for one or more system devices. The | |
805 | * processor state must be transitioned last of all. what holds the | |
806 | * class of device in the upper byte and the device number (0xFF for | |
807 | * all) for the object to be transitioned. | |
808 | * | |
809 | * The state holds the state to transition to, which may in fact | |
810 | * be an acceptance of a BIOS requested state change. | |
811 | */ | |
3f4380a1 | 812 | |
1da177e4 LT |
813 | static int set_power_state(u_short what, u_short state) |
814 | { | |
3f4380a1 | 815 | u32 eax; |
89bd55d1 | 816 | int err; |
1da177e4 | 817 | |
89bd55d1 RR |
818 | if (apm_bios_call_simple(APM_FUNC_SET_STATE, what, state, &eax, &err)) |
819 | return err; | |
1da177e4 LT |
820 | return APM_SUCCESS; |
821 | } | |
822 | ||
823 | /** | |
824 | * set_system_power_state - set system wide power state | |
825 | * @state: which state to enter | |
826 | * | |
827 | * Transition the entire system into a new APM power state. | |
828 | */ | |
3f4380a1 | 829 | |
1da177e4 LT |
830 | static int set_system_power_state(u_short state) |
831 | { | |
832 | return set_power_state(APM_DEVICE_ALL, state); | |
833 | } | |
834 | ||
835 | /** | |
836 | * apm_do_idle - perform power saving | |
837 | * | |
838 | * This function notifies the BIOS that the processor is (in the view | |
839 | * of the OS) idle. It returns -1 in the event that the BIOS refuses | |
840 | * to handle the idle request. On a success the function returns 1 | |
841 | * if the BIOS did clock slowing or 0 otherwise. | |
842 | */ | |
3f4380a1 | 843 | |
1da177e4 LT |
844 | static int apm_do_idle(void) |
845 | { | |
3f4380a1 CG |
846 | u32 eax; |
847 | u8 ret = 0; | |
848 | int idled = 0; | |
dc731fbb | 849 | int err = 0; |
64c7c8f8 | 850 | |
64c7c8f8 NP |
851 | if (!need_resched()) { |
852 | idled = 1; | |
89bd55d1 | 853 | ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err); |
64c7c8f8 | 854 | } |
64c7c8f8 NP |
855 | |
856 | if (!idled) | |
857 | return 0; | |
858 | ||
859 | if (ret) { | |
1da177e4 LT |
860 | static unsigned long t; |
861 | ||
862 | /* This always fails on some SMP boards running UP kernels. | |
863 | * Only report the failure the first 5 times. | |
864 | */ | |
3f4380a1 | 865 | if (++t < 5) { |
89bd55d1 | 866 | printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err); |
1da177e4 LT |
867 | t = jiffies; |
868 | } | |
869 | return -1; | |
870 | } | |
871 | clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; | |
872 | return clock_slowed; | |
873 | } | |
874 | ||
875 | /** | |
876 | * apm_do_busy - inform the BIOS the CPU is busy | |
877 | * | |
3f4380a1 | 878 | * Request that the BIOS brings the CPU back to full performance. |
1da177e4 | 879 | */ |
3f4380a1 | 880 | |
1da177e4 LT |
881 | static void apm_do_busy(void) |
882 | { | |
3f4380a1 | 883 | u32 dummy; |
89bd55d1 | 884 | int err; |
1da177e4 LT |
885 | |
886 | if (clock_slowed || ALWAYS_CALL_BUSY) { | |
89bd55d1 | 887 | (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err); |
1da177e4 LT |
888 | clock_slowed = 0; |
889 | } | |
890 | } | |
891 | ||
892 | /* | |
893 | * If no process has really been interested in | |
894 | * the CPU for some time, we want to call BIOS | |
895 | * power management - we probably want | |
896 | * to conserve power. | |
897 | */ | |
3f4380a1 CG |
898 | #define IDLE_CALC_LIMIT (HZ * 100) |
899 | #define IDLE_LEAKY_MAX 16 | |
1da177e4 | 900 | |
1da177e4 LT |
901 | /** |
902 | * apm_cpu_idle - cpu idling for APM capable Linux | |
903 | * | |
3f4380a1 | 904 | * This is the idling function the kernel executes when APM is available. It |
1da177e4 LT |
905 | * tries to do BIOS powermanagement based on the average system idle time. |
906 | * Furthermore it calls the system default idle routine. | |
907 | */ | |
908 | ||
dd8af076 LB |
909 | static int apm_cpu_idle(struct cpuidle_device *dev, |
910 | struct cpuidle_driver *drv, int index) | |
1da177e4 LT |
911 | { |
912 | static int use_apm_idle; /* = 0 */ | |
913 | static unsigned int last_jiffies; /* = 0 */ | |
f7dcd63d FW |
914 | static u64 last_stime; /* = 0 */ |
915 | u64 stime, utime; | |
1da177e4 LT |
916 | |
917 | int apm_idle_done = 0; | |
918 | unsigned int jiffies_since_last_check = jiffies - last_jiffies; | |
919 | unsigned int bucket; | |
920 | ||
921 | recalc: | |
f7dcd63d | 922 | task_cputime(current, &utime, &stime); |
1da177e4 LT |
923 | if (jiffies_since_last_check > IDLE_CALC_LIMIT) { |
924 | use_apm_idle = 0; | |
1da177e4 LT |
925 | } else if (jiffies_since_last_check > idle_period) { |
926 | unsigned int idle_percentage; | |
927 | ||
f7dcd63d | 928 | idle_percentage = nsecs_to_jiffies(stime - last_stime); |
1da177e4 LT |
929 | idle_percentage *= 100; |
930 | idle_percentage /= jiffies_since_last_check; | |
931 | use_apm_idle = (idle_percentage > idle_threshold); | |
932 | if (apm_info.forbid_idle) | |
933 | use_apm_idle = 0; | |
1da177e4 LT |
934 | } |
935 | ||
6fac4829 FW |
936 | last_jiffies = jiffies; |
937 | last_stime = stime; | |
938 | ||
1da177e4 LT |
939 | bucket = IDLE_LEAKY_MAX; |
940 | ||
941 | while (!need_resched()) { | |
942 | if (use_apm_idle) { | |
943 | unsigned int t; | |
944 | ||
945 | t = jiffies; | |
946 | switch (apm_do_idle()) { | |
3f4380a1 CG |
947 | case 0: |
948 | apm_idle_done = 1; | |
1da177e4 LT |
949 | if (t != jiffies) { |
950 | if (bucket) { | |
951 | bucket = IDLE_LEAKY_MAX; | |
952 | continue; | |
953 | } | |
954 | } else if (bucket) { | |
955 | bucket--; | |
956 | continue; | |
957 | } | |
958 | break; | |
3f4380a1 CG |
959 | case 1: |
960 | apm_idle_done = 1; | |
1da177e4 LT |
961 | break; |
962 | default: /* BIOS refused */ | |
963 | break; | |
964 | } | |
965 | } | |
dd8af076 | 966 | default_idle(); |
7f424a8b | 967 | local_irq_disable(); |
1da177e4 LT |
968 | jiffies_since_last_check = jiffies - last_jiffies; |
969 | if (jiffies_since_last_check > idle_period) | |
970 | goto recalc; | |
971 | } | |
972 | ||
973 | if (apm_idle_done) | |
974 | apm_do_busy(); | |
7f424a8b | 975 | |
dd8af076 | 976 | return index; |
1da177e4 LT |
977 | } |
978 | ||
979 | /** | |
980 | * apm_power_off - ask the BIOS to power off | |
981 | * | |
982 | * Handle the power off sequence. This is the one piece of code we | |
983 | * will execute even on SMP machines. In order to deal with BIOS | |
984 | * bugs we support real mode APM BIOS power off calls. We also make | |
985 | * the SMP call on CPU0 as some systems will only honour this call | |
986 | * on their first cpu. | |
987 | */ | |
3f4380a1 | 988 | |
1da177e4 LT |
989 | static void apm_power_off(void) |
990 | { | |
1da177e4 | 991 | /* Some bioses don't like being called from CPU != 0 */ |
3f4380a1 | 992 | if (apm_info.realmode_power_off) { |
89bd55d1 | 993 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
3d35ac34 | 994 | machine_real_restart(MRR_APM); |
3f4380a1 CG |
995 | } else { |
996 | (void)set_system_power_state(APM_STATE_OFF); | |
1da177e4 | 997 | } |
1da177e4 LT |
998 | } |
999 | ||
1000 | #ifdef CONFIG_APM_DO_ENABLE | |
1001 | ||
1002 | /** | |
1003 | * apm_enable_power_management - enable BIOS APM power management | |
1004 | * @enable: enable yes/no | |
1005 | * | |
3f4380a1 | 1006 | * Enable or disable the APM BIOS power services. |
1da177e4 | 1007 | */ |
3f4380a1 | 1008 | |
1da177e4 LT |
1009 | static int apm_enable_power_management(int enable) |
1010 | { | |
3f4380a1 | 1011 | u32 eax; |
89bd55d1 | 1012 | int err; |
1da177e4 LT |
1013 | |
1014 | if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) | |
1015 | return APM_NOT_ENGAGED; | |
1016 | if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, | |
89bd55d1 RR |
1017 | enable, &eax, &err)) |
1018 | return err; | |
1da177e4 LT |
1019 | if (enable) |
1020 | apm_info.bios.flags &= ~APM_BIOS_DISABLED; | |
1021 | else | |
1022 | apm_info.bios.flags |= APM_BIOS_DISABLED; | |
1023 | return APM_SUCCESS; | |
1024 | } | |
1025 | #endif | |
1026 | ||
1027 | /** | |
1028 | * apm_get_power_status - get current power state | |
1029 | * @status: returned status | |
1030 | * @bat: battery info | |
1031 | * @life: estimated life | |
1032 | * | |
1033 | * Obtain the current power status from the APM BIOS. We return a | |
1034 | * status which gives the rough battery status, and current power | |
1035 | * source. The bat value returned give an estimate as a percentage | |
1036 | * of life and a status value for the battery. The estimated life | |
1037 | * if reported is a lifetime in secodnds/minutes at current powwer | |
1038 | * consumption. | |
1039 | */ | |
3f4380a1 | 1040 | |
1da177e4 LT |
1041 | static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) |
1042 | { | |
89bd55d1 RR |
1043 | struct apm_bios_call call; |
1044 | ||
1045 | call.func = APM_FUNC_GET_STATUS; | |
1046 | call.ebx = APM_DEVICE_ALL; | |
1047 | call.ecx = 0; | |
1da177e4 LT |
1048 | |
1049 | if (apm_info.get_power_status_broken) | |
1050 | return APM_32_UNSUPPORTED; | |
3a6d8676 AB |
1051 | if (apm_bios_call(&call)) { |
1052 | if (!call.err) | |
1053 | return APM_NO_ERROR; | |
89bd55d1 | 1054 | return call.err; |
3a6d8676 | 1055 | } |
89bd55d1 RR |
1056 | *status = call.ebx; |
1057 | *bat = call.ecx; | |
1da177e4 | 1058 | if (apm_info.get_power_status_swabinminutes) { |
89bd55d1 | 1059 | *life = swab16((u16)call.edx); |
1da177e4 LT |
1060 | *life |= 0x8000; |
1061 | } else | |
89bd55d1 | 1062 | *life = call.edx; |
1da177e4 LT |
1063 | return APM_SUCCESS; |
1064 | } | |
1065 | ||
1066 | #if 0 | |
1067 | static int apm_get_battery_status(u_short which, u_short *status, | |
1068 | u_short *bat, u_short *life, u_short *nbat) | |
1069 | { | |
3f4380a1 CG |
1070 | u32 eax; |
1071 | u32 ebx; | |
1072 | u32 ecx; | |
1073 | u32 edx; | |
1074 | u32 esi; | |
1da177e4 LT |
1075 | |
1076 | if (apm_info.connection_version < 0x0102) { | |
1077 | /* pretend we only have one battery. */ | |
1078 | if (which != 1) | |
1079 | return APM_BAD_DEVICE; | |
1080 | *nbat = 1; | |
1081 | return apm_get_power_status(status, bat, life); | |
1082 | } | |
1083 | ||
1084 | if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, | |
3f4380a1 | 1085 | &ebx, &ecx, &edx, &esi)) |
1da177e4 LT |
1086 | return (eax >> 8) & 0xff; |
1087 | *status = ebx; | |
1088 | *bat = ecx; | |
1089 | *life = edx; | |
1090 | *nbat = esi; | |
1091 | return APM_SUCCESS; | |
1092 | } | |
1093 | #endif | |
1094 | ||
1095 | /** | |
1096 | * apm_engage_power_management - enable PM on a device | |
1097 | * @device: identity of device | |
1098 | * @enable: on/off | |
1099 | * | |
6a6256f9 | 1100 | * Activate or deactivate power management on either a specific device |
1da177e4 LT |
1101 | * or the entire system (%APM_DEVICE_ALL). |
1102 | */ | |
3f4380a1 | 1103 | |
1da177e4 LT |
1104 | static int apm_engage_power_management(u_short device, int enable) |
1105 | { | |
3f4380a1 | 1106 | u32 eax; |
89bd55d1 | 1107 | int err; |
1da177e4 LT |
1108 | |
1109 | if ((enable == 0) && (device == APM_DEVICE_ALL) | |
1110 | && (apm_info.bios.flags & APM_BIOS_DISABLED)) | |
1111 | return APM_DISABLED; | |
89bd55d1 RR |
1112 | if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, |
1113 | &eax, &err)) | |
1114 | return err; | |
1da177e4 LT |
1115 | if (device == APM_DEVICE_ALL) { |
1116 | if (enable) | |
1117 | apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; | |
1118 | else | |
1119 | apm_info.bios.flags |= APM_BIOS_DISENGAGED; | |
1120 | } | |
1121 | return APM_SUCCESS; | |
1122 | } | |
1123 | ||
1124 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1125 | ||
1126 | /** | |
1127 | * apm_console_blank - blank the display | |
1128 | * @blank: on/off | |
1129 | * | |
1130 | * Attempt to blank the console, firstly by blanking just video device | |
1131 | * zero, and if that fails (some BIOSes don't support it) then it blanks | |
1132 | * all video devices. Typically the BIOS will do laptop backlight and | |
1133 | * monitor powerdown for us. | |
1134 | */ | |
3f4380a1 | 1135 | |
1da177e4 LT |
1136 | static int apm_console_blank(int blank) |
1137 | { | |
87af2ffd AM |
1138 | int error = APM_NOT_ENGAGED; /* silence gcc */ |
1139 | int i; | |
3841b0a1 JC |
1140 | u_short state; |
1141 | static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; | |
1da177e4 LT |
1142 | |
1143 | state = blank ? APM_STATE_STANDBY : APM_STATE_READY; | |
3841b0a1 JC |
1144 | |
1145 | for (i = 0; i < ARRAY_SIZE(dev); i++) { | |
1146 | error = set_power_state(dev[i], state); | |
1147 | ||
1148 | if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) | |
1149 | return 1; | |
1150 | ||
1151 | if (error == APM_NOT_ENGAGED) | |
1152 | break; | |
1da177e4 | 1153 | } |
3841b0a1 | 1154 | |
73374454 | 1155 | if (error == APM_NOT_ENGAGED) { |
1da177e4 LT |
1156 | static int tried; |
1157 | int eng_error; | |
1158 | if (tried++ == 0) { | |
1159 | eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); | |
1160 | if (eng_error) { | |
1161 | apm_error("set display", error); | |
1162 | apm_error("engage interface", eng_error); | |
1163 | return 0; | |
1164 | } else | |
1165 | return apm_console_blank(blank); | |
1166 | } | |
1167 | } | |
1168 | apm_error("set display", error); | |
1169 | return 0; | |
1170 | } | |
1171 | #endif | |
1172 | ||
1173 | static int queue_empty(struct apm_user *as) | |
1174 | { | |
1175 | return as->event_head == as->event_tail; | |
1176 | } | |
1177 | ||
1178 | static apm_event_t get_queued_event(struct apm_user *as) | |
1179 | { | |
87af2ffd AM |
1180 | if (++as->event_tail >= APM_MAX_EVENTS) |
1181 | as->event_tail = 0; | |
1da177e4 LT |
1182 | return as->events[as->event_tail]; |
1183 | } | |
1184 | ||
1185 | static void queue_event(apm_event_t event, struct apm_user *sender) | |
1186 | { | |
3f4380a1 | 1187 | struct apm_user *as; |
1da177e4 LT |
1188 | |
1189 | spin_lock(&user_list_lock); | |
1190 | if (user_list == NULL) | |
1191 | goto out; | |
1192 | for (as = user_list; as != NULL; as = as->next) { | |
1193 | if ((as == sender) || (!as->reader)) | |
1194 | continue; | |
87af2ffd AM |
1195 | if (++as->event_head >= APM_MAX_EVENTS) |
1196 | as->event_head = 0; | |
1197 | ||
1da177e4 LT |
1198 | if (as->event_head == as->event_tail) { |
1199 | static int notified; | |
1200 | ||
1201 | if (notified++ == 0) | |
c767a54b | 1202 | pr_err("an event queue overflowed\n"); |
87af2ffd AM |
1203 | if (++as->event_tail >= APM_MAX_EVENTS) |
1204 | as->event_tail = 0; | |
1da177e4 LT |
1205 | } |
1206 | as->events[as->event_head] = event; | |
b764a15f | 1207 | if (!as->suser || !as->writer) |
1da177e4 LT |
1208 | continue; |
1209 | switch (event) { | |
1210 | case APM_SYS_SUSPEND: | |
1211 | case APM_USER_SUSPEND: | |
1212 | as->suspends_pending++; | |
1213 | suspends_pending++; | |
1214 | break; | |
1215 | ||
1216 | case APM_SYS_STANDBY: | |
1217 | case APM_USER_STANDBY: | |
1218 | as->standbys_pending++; | |
1219 | standbys_pending++; | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | wake_up_interruptible(&apm_waitqueue); | |
1224 | out: | |
1225 | spin_unlock(&user_list_lock); | |
1226 | } | |
1227 | ||
1da177e4 LT |
1228 | static void reinit_timer(void) |
1229 | { | |
1230 | #ifdef INIT_TIMER_AFTER_SUSPEND | |
306e440d | 1231 | unsigned long flags; |
1da177e4 | 1232 | |
ced918eb | 1233 | raw_spin_lock_irqsave(&i8253_lock, flags); |
c9919380 | 1234 | /* set the clock to HZ */ |
01898e3e | 1235 | outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ |
1da177e4 | 1236 | udelay(10); |
01898e3e | 1237 | outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ |
1da177e4 | 1238 | udelay(10); |
01898e3e | 1239 | outb_p(LATCH >> 8, PIT_CH0); /* MSB */ |
1da177e4 | 1240 | udelay(10); |
ced918eb | 1241 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1da177e4 LT |
1242 | #endif |
1243 | } | |
1244 | ||
1245 | static int suspend(int vetoable) | |
1246 | { | |
3f4380a1 | 1247 | int err; |
1da177e4 LT |
1248 | struct apm_user *as; |
1249 | ||
d1616302 | 1250 | dpm_suspend_start(PMSG_SUSPEND); |
cf579dfb | 1251 | dpm_suspend_end(PMSG_SUSPEND); |
2ed8d2b3 RW |
1252 | |
1253 | local_irq_disable(); | |
19234c08 | 1254 | syscore_suspend(); |
1da177e4 | 1255 | |
1da177e4 LT |
1256 | local_irq_enable(); |
1257 | ||
1258 | save_processor_state(); | |
1259 | err = set_system_power_state(APM_STATE_SUSPEND); | |
92c6dc59 | 1260 | ignore_normal_resume = 1; |
1da177e4 LT |
1261 | restore_processor_state(); |
1262 | ||
1263 | local_irq_disable(); | |
c7f40ff1 | 1264 | reinit_timer(); |
1da177e4 LT |
1265 | |
1266 | if (err == APM_NO_ERROR) | |
1267 | err = APM_SUCCESS; | |
1268 | if (err != APM_SUCCESS) | |
1269 | apm_error("suspend", err); | |
1270 | err = (err == APM_SUCCESS) ? 0 : -EIO; | |
2ed8d2b3 | 1271 | |
19234c08 | 1272 | syscore_resume(); |
1da177e4 | 1273 | local_irq_enable(); |
2ed8d2b3 | 1274 | |
cf579dfb | 1275 | dpm_resume_start(PMSG_RESUME); |
d1616302 | 1276 | dpm_resume_end(PMSG_RESUME); |
cf579dfb | 1277 | |
1da177e4 | 1278 | queue_event(APM_NORMAL_RESUME, NULL); |
1da177e4 LT |
1279 | spin_lock(&user_list_lock); |
1280 | for (as = user_list; as != NULL; as = as->next) { | |
1281 | as->suspend_wait = 0; | |
1282 | as->suspend_result = err; | |
1283 | } | |
1284 | spin_unlock(&user_list_lock); | |
1285 | wake_up_interruptible(&apm_suspend_waitqueue); | |
1286 | return err; | |
1287 | } | |
1288 | ||
1289 | static void standby(void) | |
1290 | { | |
3f4380a1 | 1291 | int err; |
1da177e4 | 1292 | |
cf579dfb | 1293 | dpm_suspend_end(PMSG_SUSPEND); |
2ed8d2b3 RW |
1294 | |
1295 | local_irq_disable(); | |
19234c08 | 1296 | syscore_suspend(); |
1da177e4 LT |
1297 | local_irq_enable(); |
1298 | ||
1299 | err = set_system_power_state(APM_STATE_STANDBY); | |
1300 | if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) | |
1301 | apm_error("standby", err); | |
1302 | ||
1303 | local_irq_disable(); | |
19234c08 | 1304 | syscore_resume(); |
1da177e4 | 1305 | local_irq_enable(); |
2ed8d2b3 | 1306 | |
cf579dfb | 1307 | dpm_resume_start(PMSG_RESUME); |
1da177e4 LT |
1308 | } |
1309 | ||
1310 | static apm_event_t get_event(void) | |
1311 | { | |
3f4380a1 CG |
1312 | int error; |
1313 | apm_event_t event = APM_NO_EVENTS; /* silence gcc */ | |
1da177e4 LT |
1314 | apm_eventinfo_t info; |
1315 | ||
1316 | static int notified; | |
1317 | ||
1318 | /* we don't use the eventinfo */ | |
1319 | error = apm_get_event(&event, &info); | |
1320 | if (error == APM_SUCCESS) | |
1321 | return event; | |
1322 | ||
1323 | if ((error != APM_NO_EVENTS) && (notified++ == 0)) | |
1324 | apm_error("get_event", error); | |
1325 | ||
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static void check_events(void) | |
1330 | { | |
3f4380a1 CG |
1331 | apm_event_t event; |
1332 | static unsigned long last_resume; | |
1333 | static int ignore_bounce; | |
1da177e4 LT |
1334 | |
1335 | while ((event = get_event()) != 0) { | |
1336 | if (debug) { | |
1337 | if (event <= NR_APM_EVENT_NAME) | |
1338 | printk(KERN_DEBUG "apm: received %s notify\n", | |
1339 | apm_event_name[event - 1]); | |
1340 | else | |
1341 | printk(KERN_DEBUG "apm: received unknown " | |
1342 | "event 0x%02x\n", event); | |
1343 | } | |
1344 | if (ignore_bounce | |
4f2479f0 | 1345 | && (time_after(jiffies, last_resume + bounce_interval))) |
1da177e4 LT |
1346 | ignore_bounce = 0; |
1347 | ||
1348 | switch (event) { | |
1349 | case APM_SYS_STANDBY: | |
1350 | case APM_USER_STANDBY: | |
1351 | queue_event(event, NULL); | |
1352 | if (standbys_pending <= 0) | |
1353 | standby(); | |
1354 | break; | |
1355 | ||
1356 | case APM_USER_SUSPEND: | |
1357 | #ifdef CONFIG_APM_IGNORE_USER_SUSPEND | |
1358 | if (apm_info.connection_version > 0x100) | |
1359 | set_system_power_state(APM_STATE_REJECT); | |
1360 | break; | |
1361 | #endif | |
1362 | case APM_SYS_SUSPEND: | |
1363 | if (ignore_bounce) { | |
1364 | if (apm_info.connection_version > 0x100) | |
1365 | set_system_power_state(APM_STATE_REJECT); | |
1366 | break; | |
1367 | } | |
1368 | /* | |
1369 | * If we are already processing a SUSPEND, | |
1370 | * then further SUSPEND events from the BIOS | |
1371 | * will be ignored. We also return here to | |
1372 | * cope with the fact that the Thinkpads keep | |
1373 | * sending a SUSPEND event until something else | |
1374 | * happens! | |
1375 | */ | |
1376 | if (ignore_sys_suspend) | |
1377 | return; | |
1378 | ignore_sys_suspend = 1; | |
1379 | queue_event(event, NULL); | |
1380 | if (suspends_pending <= 0) | |
1381 | (void) suspend(1); | |
1382 | break; | |
1383 | ||
1384 | case APM_NORMAL_RESUME: | |
1385 | case APM_CRITICAL_RESUME: | |
1386 | case APM_STANDBY_RESUME: | |
1387 | ignore_sys_suspend = 0; | |
1388 | last_resume = jiffies; | |
1389 | ignore_bounce = 1; | |
1390 | if ((event != APM_NORMAL_RESUME) | |
1391 | || (ignore_normal_resume == 0)) { | |
d1616302 | 1392 | dpm_resume_end(PMSG_RESUME); |
1da177e4 LT |
1393 | queue_event(event, NULL); |
1394 | } | |
1395 | ignore_normal_resume = 0; | |
1396 | break; | |
1397 | ||
1398 | case APM_CAPABILITY_CHANGE: | |
1399 | case APM_LOW_BATTERY: | |
1400 | case APM_POWER_STATUS_CHANGE: | |
1401 | queue_event(event, NULL); | |
1402 | /* If needed, notify drivers here */ | |
1403 | break; | |
1404 | ||
1405 | case APM_UPDATE_TIME: | |
1da177e4 LT |
1406 | break; |
1407 | ||
1408 | case APM_CRITICAL_SUSPEND: | |
1409 | /* | |
1410 | * We are not allowed to reject a critical suspend. | |
1411 | */ | |
3f4380a1 | 1412 | (void)suspend(0); |
1da177e4 LT |
1413 | break; |
1414 | } | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | static void apm_event_handler(void) | |
1419 | { | |
3f4380a1 CG |
1420 | static int pending_count = 4; |
1421 | int err; | |
1da177e4 LT |
1422 | |
1423 | if ((standbys_pending > 0) || (suspends_pending > 0)) { | |
1424 | if ((apm_info.connection_version > 0x100) && | |
3f4380a1 | 1425 | (pending_count-- <= 0)) { |
1da177e4 LT |
1426 | pending_count = 4; |
1427 | if (debug) | |
1428 | printk(KERN_DEBUG "apm: setting state busy\n"); | |
1429 | err = set_system_power_state(APM_STATE_BUSY); | |
1430 | if (err) | |
1431 | apm_error("busy", err); | |
1432 | } | |
1433 | } else | |
1434 | pending_count = 4; | |
1435 | check_events(); | |
1436 | } | |
1437 | ||
1438 | /* | |
1439 | * This is the APM thread main loop. | |
1440 | */ | |
1441 | ||
1442 | static void apm_mainloop(void) | |
1443 | { | |
1444 | DECLARE_WAITQUEUE(wait, current); | |
1445 | ||
1446 | add_wait_queue(&apm_waitqueue, &wait); | |
1447 | set_current_state(TASK_INTERRUPTIBLE); | |
1448 | for (;;) { | |
1449 | schedule_timeout(APM_CHECK_TIMEOUT); | |
fc09561d | 1450 | if (kthread_should_stop()) |
1da177e4 LT |
1451 | break; |
1452 | /* | |
1453 | * Ok, check all events, check for idle (and mark us sleeping | |
1454 | * so as not to count towards the load average).. | |
1455 | */ | |
1456 | set_current_state(TASK_INTERRUPTIBLE); | |
1457 | apm_event_handler(); | |
1458 | } | |
1459 | remove_wait_queue(&apm_waitqueue, &wait); | |
1460 | } | |
1461 | ||
1462 | static int check_apm_user(struct apm_user *as, const char *func) | |
1463 | { | |
b764a15f | 1464 | if (as == NULL || as->magic != APM_BIOS_MAGIC) { |
c767a54b | 1465 | pr_err("%s passed bad filp\n", func); |
1da177e4 LT |
1466 | return 1; |
1467 | } | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) | |
1472 | { | |
3f4380a1 CG |
1473 | struct apm_user *as; |
1474 | int i; | |
1475 | apm_event_t event; | |
1da177e4 LT |
1476 | |
1477 | as = fp->private_data; | |
1478 | if (check_apm_user(as, "read")) | |
1479 | return -EIO; | |
1480 | if ((int)count < sizeof(apm_event_t)) | |
1481 | return -EINVAL; | |
1482 | if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) | |
1483 | return -EAGAIN; | |
1484 | wait_event_interruptible(apm_waitqueue, !queue_empty(as)); | |
1485 | i = count; | |
1486 | while ((i >= sizeof(event)) && !queue_empty(as)) { | |
1487 | event = get_queued_event(as); | |
1488 | if (copy_to_user(buf, &event, sizeof(event))) { | |
1489 | if (i < count) | |
1490 | break; | |
1491 | return -EFAULT; | |
1492 | } | |
1493 | switch (event) { | |
1494 | case APM_SYS_SUSPEND: | |
1495 | case APM_USER_SUSPEND: | |
1496 | as->suspends_read++; | |
1497 | break; | |
1498 | ||
1499 | case APM_SYS_STANDBY: | |
1500 | case APM_USER_STANDBY: | |
1501 | as->standbys_read++; | |
1502 | break; | |
1503 | } | |
1504 | buf += sizeof(event); | |
1505 | i -= sizeof(event); | |
1506 | } | |
1507 | if (i < count) | |
1508 | return count - i; | |
1509 | if (signal_pending(current)) | |
1510 | return -ERESTARTSYS; | |
1511 | return 0; | |
1512 | } | |
1513 | ||
b146e2ce | 1514 | static __poll_t do_poll(struct file *fp, poll_table *wait) |
1da177e4 | 1515 | { |
3f4380a1 | 1516 | struct apm_user *as; |
1da177e4 LT |
1517 | |
1518 | as = fp->private_data; | |
1519 | if (check_apm_user(as, "poll")) | |
1520 | return 0; | |
1521 | poll_wait(fp, &apm_waitqueue, wait); | |
1522 | if (!queue_empty(as)) | |
a9a08845 | 1523 | return EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
1524 | return 0; |
1525 | } | |
1526 | ||
b764a15f | 1527 | static long do_ioctl(struct file *filp, u_int cmd, u_long arg) |
1da177e4 | 1528 | { |
3f4380a1 | 1529 | struct apm_user *as; |
b764a15f | 1530 | int ret; |
1da177e4 LT |
1531 | |
1532 | as = filp->private_data; | |
1533 | if (check_apm_user(as, "ioctl")) | |
1534 | return -EIO; | |
b764a15f | 1535 | if (!as->suser || !as->writer) |
1da177e4 LT |
1536 | return -EPERM; |
1537 | switch (cmd) { | |
1538 | case APM_IOC_STANDBY: | |
05d86412 | 1539 | mutex_lock(&apm_mutex); |
1da177e4 LT |
1540 | if (as->standbys_read > 0) { |
1541 | as->standbys_read--; | |
1542 | as->standbys_pending--; | |
1543 | standbys_pending--; | |
1544 | } else | |
1545 | queue_event(APM_USER_STANDBY, as); | |
1546 | if (standbys_pending <= 0) | |
1547 | standby(); | |
05d86412 | 1548 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1549 | break; |
1550 | case APM_IOC_SUSPEND: | |
05d86412 | 1551 | mutex_lock(&apm_mutex); |
1da177e4 LT |
1552 | if (as->suspends_read > 0) { |
1553 | as->suspends_read--; | |
1554 | as->suspends_pending--; | |
1555 | suspends_pending--; | |
1556 | } else | |
1557 | queue_event(APM_USER_SUSPEND, as); | |
1558 | if (suspends_pending <= 0) { | |
b764a15f | 1559 | ret = suspend(1); |
05d86412 | 1560 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1561 | } else { |
1562 | as->suspend_wait = 1; | |
05d86412 | 1563 | mutex_unlock(&apm_mutex); |
1da177e4 LT |
1564 | wait_event_interruptible(apm_suspend_waitqueue, |
1565 | as->suspend_wait == 0); | |
b764a15f | 1566 | ret = as->suspend_result; |
1da177e4 | 1567 | } |
b764a15f | 1568 | return ret; |
1da177e4 | 1569 | default: |
b764a15f | 1570 | return -ENOTTY; |
1da177e4 LT |
1571 | } |
1572 | return 0; | |
1573 | } | |
1574 | ||
3f4380a1 | 1575 | static int do_release(struct inode *inode, struct file *filp) |
1da177e4 | 1576 | { |
3f4380a1 | 1577 | struct apm_user *as; |
1da177e4 LT |
1578 | |
1579 | as = filp->private_data; | |
1580 | if (check_apm_user(as, "release")) | |
1581 | return 0; | |
1582 | filp->private_data = NULL; | |
1583 | if (as->standbys_pending > 0) { | |
1584 | standbys_pending -= as->standbys_pending; | |
1585 | if (standbys_pending <= 0) | |
1586 | standby(); | |
1587 | } | |
1588 | if (as->suspends_pending > 0) { | |
1589 | suspends_pending -= as->suspends_pending; | |
1590 | if (suspends_pending <= 0) | |
1591 | (void) suspend(1); | |
1592 | } | |
3f4380a1 | 1593 | spin_lock(&user_list_lock); |
1da177e4 LT |
1594 | if (user_list == as) |
1595 | user_list = as->next; | |
1596 | else { | |
3f4380a1 | 1597 | struct apm_user *as1; |
1da177e4 LT |
1598 | |
1599 | for (as1 = user_list; | |
1600 | (as1 != NULL) && (as1->next != as); | |
1601 | as1 = as1->next) | |
1602 | ; | |
1603 | if (as1 == NULL) | |
c767a54b | 1604 | pr_err("filp not in user list\n"); |
1da177e4 LT |
1605 | else |
1606 | as1->next = as->next; | |
1607 | } | |
1608 | spin_unlock(&user_list_lock); | |
1609 | kfree(as); | |
1610 | return 0; | |
1611 | } | |
1612 | ||
3f4380a1 | 1613 | static int do_open(struct inode *inode, struct file *filp) |
1da177e4 | 1614 | { |
3f4380a1 | 1615 | struct apm_user *as; |
1da177e4 | 1616 | |
5cbded58 | 1617 | as = kmalloc(sizeof(*as), GFP_KERNEL); |
c767a54b | 1618 | if (as == NULL) |
1da177e4 | 1619 | return -ENOMEM; |
c767a54b | 1620 | |
1da177e4 LT |
1621 | as->magic = APM_BIOS_MAGIC; |
1622 | as->event_tail = as->event_head = 0; | |
1623 | as->suspends_pending = as->standbys_pending = 0; | |
1624 | as->suspends_read = as->standbys_read = 0; | |
1625 | /* | |
1626 | * XXX - this is a tiny bit broken, when we consider BSD | |
3f4380a1 | 1627 | * process accounting. If the device is opened by root, we |
1da177e4 LT |
1628 | * instantly flag that we used superuser privs. Who knows, |
1629 | * we might close the device immediately without doing a | |
1630 | * privileged operation -- cevans | |
1631 | */ | |
1632 | as->suser = capable(CAP_SYS_ADMIN); | |
1633 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; | |
1634 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; | |
1635 | spin_lock(&user_list_lock); | |
1636 | as->next = user_list; | |
1637 | user_list = as; | |
1638 | spin_unlock(&user_list_lock); | |
1639 | filp->private_data = as; | |
1640 | return 0; | |
1641 | } | |
1642 | ||
002b87d2 | 1643 | #ifdef CONFIG_PROC_FS |
016d6f35 | 1644 | static int proc_apm_show(struct seq_file *m, void *v) |
1da177e4 | 1645 | { |
1da177e4 LT |
1646 | unsigned short bx; |
1647 | unsigned short cx; | |
1648 | unsigned short dx; | |
1649 | int error; | |
1650 | unsigned short ac_line_status = 0xff; | |
1651 | unsigned short battery_status = 0xff; | |
1652 | unsigned short battery_flag = 0xff; | |
1653 | int percentage = -1; | |
1654 | int time_units = -1; | |
1655 | char *units = "?"; | |
1656 | ||
1da177e4 LT |
1657 | if ((num_online_cpus() == 1) && |
1658 | !(error = apm_get_power_status(&bx, &cx, &dx))) { | |
1659 | ac_line_status = (bx >> 8) & 0xff; | |
1660 | battery_status = bx & 0xff; | |
1661 | if ((cx & 0xff) != 0xff) | |
1662 | percentage = cx & 0xff; | |
1663 | ||
1664 | if (apm_info.connection_version > 0x100) { | |
1665 | battery_flag = (cx >> 8) & 0xff; | |
1666 | if (dx != 0xffff) { | |
1667 | units = (dx & 0x8000) ? "min" : "sec"; | |
1668 | time_units = dx & 0x7fff; | |
1669 | } | |
1670 | } | |
1671 | } | |
1672 | /* Arguments, with symbols from linux/apm_bios.h. Information is | |
1673 | from the Get Power Status (0x0a) call unless otherwise noted. | |
1674 | ||
1675 | 0) Linux driver version (this will change if format changes) | |
1676 | 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. | |
1677 | 2) APM flags from APM Installation Check (0x00): | |
1678 | bit 0: APM_16_BIT_SUPPORT | |
1679 | bit 1: APM_32_BIT_SUPPORT | |
1680 | bit 2: APM_IDLE_SLOWS_CLOCK | |
1681 | bit 3: APM_BIOS_DISABLED | |
1682 | bit 4: APM_BIOS_DISENGAGED | |
1683 | 3) AC line status | |
1684 | 0x00: Off-line | |
1685 | 0x01: On-line | |
1686 | 0x02: On backup power (BIOS >= 1.1 only) | |
1687 | 0xff: Unknown | |
1688 | 4) Battery status | |
1689 | 0x00: High | |
1690 | 0x01: Low | |
1691 | 0x02: Critical | |
1692 | 0x03: Charging | |
1693 | 0x04: Selected battery not present (BIOS >= 1.2 only) | |
1694 | 0xff: Unknown | |
1695 | 5) Battery flag | |
1696 | bit 0: High | |
1697 | bit 1: Low | |
1698 | bit 2: Critical | |
1699 | bit 3: Charging | |
1700 | bit 7: No system battery | |
1701 | 0xff: Unknown | |
1702 | 6) Remaining battery life (percentage of charge): | |
1703 | 0-100: valid | |
1704 | -1: Unknown | |
1705 | 7) Remaining battery life (time units): | |
1706 | Number of remaining minutes or seconds | |
1707 | -1: Unknown | |
1708 | 8) min = minutes; sec = seconds */ | |
1709 | ||
016d6f35 | 1710 | seq_printf(m, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", |
3f4380a1 CG |
1711 | driver_version, |
1712 | (apm_info.bios.version >> 8) & 0xff, | |
1713 | apm_info.bios.version & 0xff, | |
1714 | apm_info.bios.flags, | |
1715 | ac_line_status, | |
1716 | battery_status, | |
1717 | battery_flag, | |
1718 | percentage, | |
1719 | time_units, | |
1720 | units); | |
016d6f35 AD |
1721 | return 0; |
1722 | } | |
002b87d2 | 1723 | #endif |
1da177e4 | 1724 | |
1da177e4 LT |
1725 | static int apm(void *unused) |
1726 | { | |
1727 | unsigned short bx; | |
1728 | unsigned short cx; | |
1729 | unsigned short dx; | |
1730 | int error; | |
3f4380a1 CG |
1731 | char *power_stat; |
1732 | char *bat_stat; | |
1da177e4 | 1733 | |
1da177e4 LT |
1734 | /* 2002/08/01 - WT |
1735 | * This is to avoid random crashes at boot time during initialization | |
1736 | * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. | |
1737 | * Some bioses don't like being called from CPU != 0. | |
1738 | * Method suggested by Ingo Molnar. | |
1739 | */ | |
89bd55d1 | 1740 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
1da177e4 | 1741 | BUG_ON(smp_processor_id() != 0); |
1da177e4 LT |
1742 | |
1743 | if (apm_info.connection_version == 0) { | |
1744 | apm_info.connection_version = apm_info.bios.version; | |
1745 | if (apm_info.connection_version > 0x100) { | |
1746 | /* | |
1747 | * We only support BIOSs up to version 1.2 | |
1748 | */ | |
1749 | if (apm_info.connection_version > 0x0102) | |
1750 | apm_info.connection_version = 0x0102; | |
1751 | error = apm_driver_version(&apm_info.connection_version); | |
1752 | if (error != APM_SUCCESS) { | |
1753 | apm_error("driver version", error); | |
1754 | /* Fall back to an APM 1.0 connection. */ | |
1755 | apm_info.connection_version = 0x100; | |
1756 | } | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | if (debug) | |
1761 | printk(KERN_INFO "apm: Connection version %d.%d\n", | |
1762 | (apm_info.connection_version >> 8) & 0xff, | |
1763 | apm_info.connection_version & 0xff); | |
1764 | ||
1765 | #ifdef CONFIG_APM_DO_ENABLE | |
1766 | if (apm_info.bios.flags & APM_BIOS_DISABLED) { | |
1767 | /* | |
1768 | * This call causes my NEC UltraLite Versa 33/C to hang if it | |
1769 | * is booted with PM disabled but not in the docking station. | |
1770 | * Unfortunate ... | |
1771 | */ | |
1772 | error = apm_enable_power_management(1); | |
1773 | if (error) { | |
1774 | apm_error("enable power management", error); | |
1775 | return -1; | |
1776 | } | |
1777 | } | |
1778 | #endif | |
1779 | ||
1780 | if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) | |
1781 | && (apm_info.connection_version > 0x0100)) { | |
1782 | error = apm_engage_power_management(APM_DEVICE_ALL, 1); | |
1783 | if (error) { | |
1784 | apm_error("engage power management", error); | |
1785 | return -1; | |
1786 | } | |
1787 | } | |
1788 | ||
3f4380a1 | 1789 | if (debug && (num_online_cpus() == 1 || smp)) { |
1da177e4 LT |
1790 | error = apm_get_power_status(&bx, &cx, &dx); |
1791 | if (error) | |
1792 | printk(KERN_INFO "apm: power status not available\n"); | |
1793 | else { | |
1794 | switch ((bx >> 8) & 0xff) { | |
3f4380a1 CG |
1795 | case 0: |
1796 | power_stat = "off line"; | |
1797 | break; | |
1798 | case 1: | |
1799 | power_stat = "on line"; | |
1800 | break; | |
1801 | case 2: | |
1802 | power_stat = "on backup power"; | |
1803 | break; | |
1804 | default: | |
1805 | power_stat = "unknown"; | |
1806 | break; | |
1da177e4 LT |
1807 | } |
1808 | switch (bx & 0xff) { | |
3f4380a1 CG |
1809 | case 0: |
1810 | bat_stat = "high"; | |
1811 | break; | |
1812 | case 1: | |
1813 | bat_stat = "low"; | |
1814 | break; | |
1815 | case 2: | |
1816 | bat_stat = "critical"; | |
1817 | break; | |
1818 | case 3: | |
1819 | bat_stat = "charging"; | |
1820 | break; | |
1821 | default: | |
1822 | bat_stat = "unknown"; | |
1823 | break; | |
1da177e4 LT |
1824 | } |
1825 | printk(KERN_INFO | |
1826 | "apm: AC %s, battery status %s, battery life ", | |
1827 | power_stat, bat_stat); | |
1828 | if ((cx & 0xff) == 0xff) | |
1829 | printk("unknown\n"); | |
1830 | else | |
1831 | printk("%d%%\n", cx & 0xff); | |
1832 | if (apm_info.connection_version > 0x100) { | |
1833 | printk(KERN_INFO | |
1834 | "apm: battery flag 0x%02x, battery life ", | |
1835 | (cx >> 8) & 0xff); | |
1836 | if (dx == 0xffff) | |
1837 | printk("unknown\n"); | |
1838 | else | |
1839 | printk("%d %s\n", dx & 0x7fff, | |
3f4380a1 CG |
1840 | (dx & 0x8000) ? |
1841 | "minutes" : "seconds"); | |
1da177e4 LT |
1842 | } |
1843 | } | |
1844 | } | |
1845 | ||
1846 | /* Install our power off handler.. */ | |
1847 | if (power_off) | |
1848 | pm_power_off = apm_power_off; | |
1849 | ||
1850 | if (num_online_cpus() == 1 || smp) { | |
1851 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1852 | console_blank_hook = apm_console_blank; | |
1853 | #endif | |
1854 | apm_mainloop(); | |
1855 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) | |
1856 | console_blank_hook = NULL; | |
1857 | #endif | |
1858 | } | |
1da177e4 LT |
1859 | |
1860 | return 0; | |
1861 | } | |
1862 | ||
1863 | #ifndef MODULE | |
1864 | static int __init apm_setup(char *str) | |
1865 | { | |
3f4380a1 | 1866 | int invert; |
1da177e4 LT |
1867 | |
1868 | while ((str != NULL) && (*str != '\0')) { | |
1869 | if (strncmp(str, "off", 3) == 0) | |
1870 | apm_disabled = 1; | |
1871 | if (strncmp(str, "on", 2) == 0) | |
1872 | apm_disabled = 0; | |
1873 | if ((strncmp(str, "bounce-interval=", 16) == 0) || | |
1874 | (strncmp(str, "bounce_interval=", 16) == 0)) | |
1875 | bounce_interval = simple_strtol(str + 16, NULL, 0); | |
1876 | if ((strncmp(str, "idle-threshold=", 15) == 0) || | |
1877 | (strncmp(str, "idle_threshold=", 15) == 0)) | |
1878 | idle_threshold = simple_strtol(str + 15, NULL, 0); | |
1879 | if ((strncmp(str, "idle-period=", 12) == 0) || | |
1880 | (strncmp(str, "idle_period=", 12) == 0)) | |
1881 | idle_period = simple_strtol(str + 12, NULL, 0); | |
1882 | invert = (strncmp(str, "no-", 3) == 0) || | |
1883 | (strncmp(str, "no_", 3) == 0); | |
1884 | if (invert) | |
1885 | str += 3; | |
1886 | if (strncmp(str, "debug", 5) == 0) | |
1887 | debug = !invert; | |
1888 | if ((strncmp(str, "power-off", 9) == 0) || | |
1889 | (strncmp(str, "power_off", 9) == 0)) | |
1890 | power_off = !invert; | |
3f4380a1 | 1891 | if (strncmp(str, "smp", 3) == 0) { |
1da177e4 LT |
1892 | smp = !invert; |
1893 | idle_threshold = 100; | |
1894 | } | |
1895 | if ((strncmp(str, "allow-ints", 10) == 0) || | |
1896 | (strncmp(str, "allow_ints", 10) == 0)) | |
3f4380a1 | 1897 | apm_info.allow_ints = !invert; |
1da177e4 LT |
1898 | if ((strncmp(str, "broken-psr", 10) == 0) || |
1899 | (strncmp(str, "broken_psr", 10) == 0)) | |
1900 | apm_info.get_power_status_broken = !invert; | |
1901 | if ((strncmp(str, "realmode-power-off", 18) == 0) || | |
1902 | (strncmp(str, "realmode_power_off", 18) == 0)) | |
1903 | apm_info.realmode_power_off = !invert; | |
1904 | str = strchr(str, ','); | |
1905 | if (str != NULL) | |
1906 | str += strspn(str, ", \t"); | |
1907 | } | |
1908 | return 1; | |
1909 | } | |
1910 | ||
1911 | __setup("apm=", apm_setup); | |
1912 | #endif | |
1913 | ||
5dfe4c96 | 1914 | static const struct file_operations apm_bios_fops = { |
1da177e4 LT |
1915 | .owner = THIS_MODULE, |
1916 | .read = do_read, | |
1917 | .poll = do_poll, | |
b764a15f | 1918 | .unlocked_ioctl = do_ioctl, |
1da177e4 LT |
1919 | .open = do_open, |
1920 | .release = do_release, | |
6038f373 | 1921 | .llseek = noop_llseek, |
1da177e4 LT |
1922 | }; |
1923 | ||
1924 | static struct miscdevice apm_device = { | |
1925 | APM_MINOR_DEV, | |
1926 | "apm_bios", | |
1927 | &apm_bios_fops | |
1928 | }; | |
1929 | ||
1930 | ||
1931 | /* Simple "print if true" callback */ | |
1855256c | 1932 | static int __init print_if_true(const struct dmi_system_id *d) |
1da177e4 LT |
1933 | { |
1934 | printk("%s\n", d->ident); | |
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was | |
1940 | * disabled before the suspend. Linux used to get terribly confused by that. | |
1941 | */ | |
1855256c | 1942 | static int __init broken_ps2_resume(const struct dmi_system_id *d) |
1da177e4 | 1943 | { |
3f4380a1 CG |
1944 | printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " |
1945 | "workaround hopefully not needed.\n", d->ident); | |
1da177e4 LT |
1946 | return 0; |
1947 | } | |
1948 | ||
1949 | /* Some bioses have a broken protected mode poweroff and need to use realmode */ | |
1855256c | 1950 | static int __init set_realmode_power_off(const struct dmi_system_id *d) |
1da177e4 LT |
1951 | { |
1952 | if (apm_info.realmode_power_off == 0) { | |
1953 | apm_info.realmode_power_off = 1; | |
3f4380a1 CG |
1954 | printk(KERN_INFO "%s bios detected. " |
1955 | "Using realmode poweroff only.\n", d->ident); | |
1da177e4 LT |
1956 | } |
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | /* Some laptops require interrupts to be enabled during APM calls */ | |
1855256c | 1961 | static int __init set_apm_ints(const struct dmi_system_id *d) |
1da177e4 LT |
1962 | { |
1963 | if (apm_info.allow_ints == 0) { | |
1964 | apm_info.allow_ints = 1; | |
3f4380a1 CG |
1965 | printk(KERN_INFO "%s machine detected. " |
1966 | "Enabling interrupts during APM calls.\n", d->ident); | |
1da177e4 LT |
1967 | } |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | /* Some APM bioses corrupt memory or just plain do not work */ | |
1855256c | 1972 | static int __init apm_is_horked(const struct dmi_system_id *d) |
1da177e4 LT |
1973 | { |
1974 | if (apm_info.disabled == 0) { | |
1975 | apm_info.disabled = 1; | |
3f4380a1 CG |
1976 | printk(KERN_INFO "%s machine detected. " |
1977 | "Disabling APM.\n", d->ident); | |
1da177e4 LT |
1978 | } |
1979 | return 0; | |
1980 | } | |
1981 | ||
1855256c | 1982 | static int __init apm_is_horked_d850md(const struct dmi_system_id *d) |
1da177e4 LT |
1983 | { |
1984 | if (apm_info.disabled == 0) { | |
1985 | apm_info.disabled = 1; | |
3f4380a1 CG |
1986 | printk(KERN_INFO "%s machine detected. " |
1987 | "Disabling APM.\n", d->ident); | |
3235dc3f FP |
1988 | printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n"); |
1989 | printk(KERN_INFO "download from support.intel.com\n"); | |
1da177e4 LT |
1990 | } |
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | /* Some APM bioses hang on APM idle calls */ | |
1855256c | 1995 | static int __init apm_likes_to_melt(const struct dmi_system_id *d) |
1da177e4 LT |
1996 | { |
1997 | if (apm_info.forbid_idle == 0) { | |
1998 | apm_info.forbid_idle = 1; | |
3f4380a1 CG |
1999 | printk(KERN_INFO "%s machine detected. " |
2000 | "Disabling APM idle calls.\n", d->ident); | |
1da177e4 LT |
2001 | } |
2002 | return 0; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Check for clue free BIOS implementations who use | |
2007 | * the following QA technique | |
2008 | * | |
2009 | * [ Write BIOS Code ]<------ | |
2010 | * | ^ | |
2011 | * < Does it Compile >----N-- | |
2012 | * |Y ^ | |
2013 | * < Does it Boot Win98 >-N-- | |
2014 | * |Y | |
2015 | * [Ship It] | |
2016 | * | |
2017 | * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) | |
2018 | * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) | |
2019 | */ | |
1855256c | 2020 | static int __init broken_apm_power(const struct dmi_system_id *d) |
1da177e4 LT |
2021 | { |
2022 | apm_info.get_power_status_broken = 1; | |
3f4380a1 CG |
2023 | printk(KERN_WARNING "BIOS strings suggest APM bugs, " |
2024 | "disabling power status reporting.\n"); | |
1da177e4 LT |
2025 | return 0; |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * This bios swaps the APM minute reporting bytes over (Many sony laptops | |
2030 | * have this problem). | |
2031 | */ | |
1855256c | 2032 | static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) |
1da177e4 LT |
2033 | { |
2034 | apm_info.get_power_status_swabinminutes = 1; | |
3f4380a1 CG |
2035 | printk(KERN_WARNING "BIOS strings suggest APM reports battery life " |
2036 | "in minutes and wrong byte order.\n"); | |
1da177e4 LT |
2037 | return 0; |
2038 | } | |
2039 | ||
6faadbbb | 2040 | static const struct dmi_system_id apm_dmi_table[] __initconst = { |
1da177e4 LT |
2041 | { |
2042 | print_if_true, | |
2043 | KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM.", | |
2044 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), | |
2045 | DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)"), }, | |
2046 | }, | |
2047 | { /* Handle problems with APM on the C600 */ | |
2048 | broken_ps2_resume, "Dell Latitude C600", | |
2049 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell"), | |
2050 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600"), }, | |
2051 | }, | |
2052 | { /* Allow interrupts during suspend on Dell Latitude laptops*/ | |
2053 | set_apm_ints, "Dell Latitude", | |
2054 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2055 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510"), } | |
2056 | }, | |
2057 | { /* APM crashes */ | |
2058 | apm_is_horked, "Dell Inspiron 2500", | |
2059 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2060 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), | |
3f4380a1 CG |
2061 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
2062 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2063 | }, |
2064 | { /* Allow interrupts during suspend on Dell Inspiron laptops*/ | |
2065 | set_apm_ints, "Dell Inspiron", { | |
2066 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2067 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000"), }, | |
2068 | }, | |
2069 | { /* Handle problems with APM on Inspiron 5000e */ | |
2070 | broken_apm_power, "Dell Inspiron 5000e", | |
2071 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2072 | DMI_MATCH(DMI_BIOS_VERSION, "A04"), | |
2073 | DMI_MATCH(DMI_BIOS_DATE, "08/24/2000"), }, | |
2074 | }, | |
2075 | { /* Handle problems with APM on Inspiron 2500 */ | |
2076 | broken_apm_power, "Dell Inspiron 2500", | |
2077 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2078 | DMI_MATCH(DMI_BIOS_VERSION, "A12"), | |
2079 | DMI_MATCH(DMI_BIOS_DATE, "02/04/2002"), }, | |
2080 | }, | |
2081 | { /* APM crashes */ | |
2082 | apm_is_horked, "Dell Dimension 4100", | |
2083 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2084 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), | |
3f4380a1 CG |
2085 | DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), |
2086 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2087 | }, |
2088 | { /* Allow interrupts during suspend on Compaq Laptops*/ | |
2089 | set_apm_ints, "Compaq 12XL125", | |
2090 | { DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), | |
2091 | DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC"), | |
2092 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
3f4380a1 | 2093 | DMI_MATCH(DMI_BIOS_VERSION, "4.06"), }, |
1da177e4 LT |
2094 | }, |
2095 | { /* Allow interrupts during APM or the clock goes slow */ | |
2096 | set_apm_ints, "ASUSTeK", | |
2097 | { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
2098 | DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC"), }, | |
2099 | }, | |
2100 | { /* APM blows on shutdown */ | |
2101 | apm_is_horked, "ABIT KX7-333[R]", | |
2102 | { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT"), | |
2103 | DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])"), }, | |
2104 | }, | |
2105 | { /* APM crashes */ | |
2106 | apm_is_horked, "Trigem Delhi3", | |
2107 | { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc"), | |
2108 | DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3"), }, | |
2109 | }, | |
2110 | { /* APM crashes */ | |
2111 | apm_is_horked, "Fujitsu-Siemens", | |
2112 | { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS"), | |
2113 | DMI_MATCH(DMI_BIOS_VERSION, "Version1.01"), }, | |
2114 | }, | |
2115 | { /* APM crashes */ | |
2116 | apm_is_horked_d850md, "Intel D850MD", | |
2117 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2118 | DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536"), }, | |
2119 | }, | |
2120 | { /* APM crashes */ | |
2121 | apm_is_horked, "Intel D810EMO", | |
2122 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2123 | DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800"), }, | |
2124 | }, | |
2125 | { /* APM crashes */ | |
2126 | apm_is_horked, "Dell XPS-Z", | |
2127 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp."), | |
2128 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), | |
2129 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z"), }, | |
2130 | }, | |
2131 | { /* APM crashes */ | |
2132 | apm_is_horked, "Sharp PC-PJ/AX", | |
2133 | { DMI_MATCH(DMI_SYS_VENDOR, "SHARP"), | |
2134 | DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX"), | |
3f4380a1 CG |
2135 | DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft"), |
2136 | DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08"), }, | |
1da177e4 LT |
2137 | }, |
2138 | { /* APM crashes */ | |
2139 | apm_is_horked, "Dell Inspiron 2500", | |
2140 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | |
2141 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500"), | |
3f4380a1 CG |
2142 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
2143 | DMI_MATCH(DMI_BIOS_VERSION, "A11"), }, | |
1da177e4 LT |
2144 | }, |
2145 | { /* APM idle hangs */ | |
2146 | apm_likes_to_melt, "Jabil AMD", | |
2147 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
2148 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), }, | |
2149 | }, | |
2150 | { /* APM idle hangs */ | |
2151 | apm_likes_to_melt, "AMI Bios", | |
2152 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
2153 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), }, | |
2154 | }, | |
2155 | { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ | |
2156 | swab_apm_power_in_minutes, "Sony VAIO", | |
2157 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2158 | DMI_MATCH(DMI_BIOS_VERSION, "R0206H"), | |
2159 | DMI_MATCH(DMI_BIOS_DATE, "08/23/99"), }, | |
2160 | }, | |
2161 | { /* Handle problems with APM on Sony Vaio PCG-N505VX */ | |
2162 | swab_apm_power_in_minutes, "Sony VAIO", | |
2163 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2164 | DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0"), | |
2165 | DMI_MATCH(DMI_BIOS_DATE, "02/03/00"), }, | |
2166 | }, | |
2167 | { /* Handle problems with APM on Sony Vaio PCG-XG29 */ | |
2168 | swab_apm_power_in_minutes, "Sony VAIO", | |
2169 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2170 | DMI_MATCH(DMI_BIOS_VERSION, "R0117A0"), | |
2171 | DMI_MATCH(DMI_BIOS_DATE, "04/25/00"), }, | |
2172 | }, | |
2173 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ | |
2174 | swab_apm_power_in_minutes, "Sony VAIO", | |
2175 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2176 | DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1"), | |
2177 | DMI_MATCH(DMI_BIOS_DATE, "05/11/00"), }, | |
2178 | }, | |
2179 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ | |
2180 | swab_apm_power_in_minutes, "Sony VAIO", | |
2181 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2182 | DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1"), | |
2183 | DMI_MATCH(DMI_BIOS_DATE, "08/11/00"), }, | |
2184 | }, | |
2185 | { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ | |
2186 | swab_apm_power_in_minutes, "Sony VAIO", | |
2187 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2188 | DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3"), | |
2189 | DMI_MATCH(DMI_BIOS_DATE, "12/25/00"), }, | |
2190 | }, | |
2191 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ | |
2192 | swab_apm_power_in_minutes, "Sony VAIO", | |
2193 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2194 | DMI_MATCH(DMI_BIOS_VERSION, "R0203D0"), | |
2195 | DMI_MATCH(DMI_BIOS_DATE, "05/12/00"), }, | |
2196 | }, | |
2197 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ | |
2198 | swab_apm_power_in_minutes, "Sony VAIO", | |
2199 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2200 | DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3"), | |
2201 | DMI_MATCH(DMI_BIOS_DATE, "08/25/00"), }, | |
2202 | }, | |
2203 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ | |
2204 | swab_apm_power_in_minutes, "Sony VAIO", | |
2205 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2206 | DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3"), | |
2207 | DMI_MATCH(DMI_BIOS_DATE, "05/12/01"), }, | |
2208 | }, | |
2209 | { /* Handle problems with APM on Sony Vaio PCG-F104K */ | |
2210 | swab_apm_power_in_minutes, "Sony VAIO", | |
2211 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2212 | DMI_MATCH(DMI_BIOS_VERSION, "R0204K2"), | |
2213 | DMI_MATCH(DMI_BIOS_DATE, "08/28/00"), }, | |
2214 | }, | |
2215 | ||
2216 | { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ | |
2217 | swab_apm_power_in_minutes, "Sony VAIO", | |
2218 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2219 | DMI_MATCH(DMI_BIOS_VERSION, "R0208P1"), | |
2220 | DMI_MATCH(DMI_BIOS_DATE, "11/09/00"), }, | |
2221 | }, | |
2222 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ | |
2223 | swab_apm_power_in_minutes, "Sony VAIO", | |
2224 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2225 | DMI_MATCH(DMI_BIOS_VERSION, "R0204P1"), | |
2226 | DMI_MATCH(DMI_BIOS_DATE, "09/12/00"), }, | |
2227 | }, | |
2228 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ | |
2229 | swab_apm_power_in_minutes, "Sony VAIO", | |
2230 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
2231 | DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3"), | |
2232 | DMI_MATCH(DMI_BIOS_DATE, "10/26/01"), }, | |
2233 | }, | |
2234 | { /* broken PM poweroff bios */ | |
2235 | set_realmode_power_off, "Award Software v4.60 PGMA", | |
2236 | { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc."), | |
2237 | DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA"), | |
2238 | DMI_MATCH(DMI_BIOS_DATE, "134526184"), }, | |
2239 | }, | |
2240 | ||
2241 | /* Generic per vendor APM settings */ | |
2242 | ||
2243 | { /* Allow interrupts during suspend on IBM laptops */ | |
2244 | set_apm_ints, "IBM", | |
2245 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), }, | |
2246 | }, | |
2247 | ||
2248 | { } | |
2249 | }; | |
2250 | ||
2251 | /* | |
2252 | * Just start the APM thread. We do NOT want to do APM BIOS | |
2253 | * calls from anything but the APM thread, if for no other reason | |
2254 | * than the fact that we don't trust the APM BIOS. This way, | |
2255 | * most common APM BIOS problems that lead to protection errors | |
2256 | * etc will have at least some level of being contained... | |
2257 | * | |
2258 | * In short, if something bad happens, at least we have a choice | |
2259 | * of just killing the apm thread.. | |
2260 | */ | |
2261 | static int __init apm_init(void) | |
2262 | { | |
92f17f01 | 2263 | struct desc_struct *gdt; |
fc09561d | 2264 | int err; |
1da177e4 LT |
2265 | |
2266 | dmi_check_system(apm_dmi_table); | |
2267 | ||
8bc55f80 | 2268 | if (apm_info.bios.version == 0 || machine_is_olpc()) { |
1da177e4 LT |
2269 | printk(KERN_INFO "apm: BIOS not found.\n"); |
2270 | return -ENODEV; | |
2271 | } | |
2272 | printk(KERN_INFO | |
3f4380a1 CG |
2273 | "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n", |
2274 | ((apm_info.bios.version >> 8) & 0xff), | |
2275 | (apm_info.bios.version & 0xff), | |
2276 | apm_info.bios.flags, | |
2277 | driver_version); | |
1da177e4 LT |
2278 | if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { |
2279 | printk(KERN_INFO "apm: no 32 bit BIOS support\n"); | |
2280 | return -ENODEV; | |
2281 | } | |
2282 | ||
2283 | if (allow_ints) | |
2284 | apm_info.allow_ints = 1; | |
2285 | if (broken_psr) | |
2286 | apm_info.get_power_status_broken = 1; | |
2287 | if (realmode_power_off) | |
2288 | apm_info.realmode_power_off = 1; | |
2289 | /* User can override, but default is to trust DMI */ | |
2290 | if (apm_disabled != -1) | |
2291 | apm_info.disabled = apm_disabled; | |
2292 | ||
2293 | /* | |
2294 | * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 | |
2295 | * but is reportedly a 1.0 BIOS. | |
2296 | */ | |
2297 | if (apm_info.bios.version == 0x001) | |
2298 | apm_info.bios.version = 0x100; | |
2299 | ||
2300 | /* BIOS < 1.2 doesn't set cseg_16_len */ | |
2301 | if (apm_info.bios.version < 0x102) | |
2302 | apm_info.bios.cseg_16_len = 0; /* 64k */ | |
2303 | ||
2304 | if (debug) { | |
07a30460 | 2305 | printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x", |
1da177e4 LT |
2306 | apm_info.bios.cseg, apm_info.bios.offset, |
2307 | apm_info.bios.cseg_16, apm_info.bios.dseg); | |
2308 | if (apm_info.bios.version > 0x100) | |
2309 | printk(" cseg len %x, dseg len %x", | |
2310 | apm_info.bios.cseg_len, | |
2311 | apm_info.bios.dseg_len); | |
2312 | if (apm_info.bios.version > 0x101) | |
2313 | printk(" cseg16 len %x", apm_info.bios.cseg_16_len); | |
2314 | printk("\n"); | |
2315 | } | |
2316 | ||
2317 | if (apm_info.disabled) { | |
c767a54b | 2318 | pr_notice("disabled on user request.\n"); |
1da177e4 LT |
2319 | return -ENODEV; |
2320 | } | |
2321 | if ((num_online_cpus() > 1) && !power_off && !smp) { | |
c767a54b | 2322 | pr_notice("disabled - APM is not SMP safe.\n"); |
1da177e4 LT |
2323 | apm_info.disabled = 1; |
2324 | return -ENODEV; | |
2325 | } | |
6831c6ed | 2326 | if (!acpi_disabled) { |
c767a54b | 2327 | pr_notice("overridden by ACPI.\n"); |
1da177e4 LT |
2328 | apm_info.disabled = 1; |
2329 | return -ENODEV; | |
2330 | } | |
1da177e4 | 2331 | |
3012d2d2 ZA |
2332 | /* |
2333 | * Set up the long jump entry point to the APM BIOS, which is called | |
2334 | * from inline assembly. | |
2335 | */ | |
1da177e4 LT |
2336 | apm_bios_entry.offset = apm_info.bios.offset; |
2337 | apm_bios_entry.segment = APM_CS; | |
2338 | ||
3012d2d2 ZA |
2339 | /* |
2340 | * The APM 1.1 BIOS is supposed to provide limit information that it | |
2341 | * recognizes. Many machines do this correctly, but many others do | |
2342 | * not restrict themselves to their claimed limit. When this happens, | |
2343 | * they will cause a segmentation violation in the kernel at boot time. | |
2344 | * Most BIOS's, however, will respect a 64k limit, so we use that. | |
92f17f01 ZA |
2345 | * |
2346 | * Note we only set APM segments on CPU zero, since we pin the APM | |
2347 | * code to that CPU. | |
3012d2d2 | 2348 | */ |
69218e47 | 2349 | gdt = get_cpu_gdt_rw(0); |
57594742 AM |
2350 | set_desc_base(&gdt[APM_CS >> 3], |
2351 | (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); | |
2352 | set_desc_base(&gdt[APM_CS_16 >> 3], | |
2353 | (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); | |
2354 | set_desc_base(&gdt[APM_DS >> 3], | |
2355 | (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); | |
1da177e4 | 2356 | |
3f3942ac | 2357 | proc_create_single("apm", 0, NULL, proc_apm_show); |
1da177e4 | 2358 | |
fc09561d SH |
2359 | kapmd_task = kthread_create(apm, NULL, "kapmd"); |
2360 | if (IS_ERR(kapmd_task)) { | |
c767a54b | 2361 | pr_err("disabled - Unable to start kernel thread\n"); |
fc09561d SH |
2362 | err = PTR_ERR(kapmd_task); |
2363 | kapmd_task = NULL; | |
c94a62aa | 2364 | remove_proc_entry("apm", NULL); |
fc09561d | 2365 | return err; |
1da177e4 | 2366 | } |
fc09561d | 2367 | wake_up_process(kapmd_task); |
1da177e4 | 2368 | |
3f4380a1 | 2369 | if (num_online_cpus() > 1 && !smp) { |
1da177e4 | 2370 | printk(KERN_NOTICE |
3f4380a1 | 2371 | "apm: disabled - APM is not SMP safe (power off active).\n"); |
1da177e4 LT |
2372 | return 0; |
2373 | } | |
2374 | ||
c94a62aa NH |
2375 | /* |
2376 | * Note we don't actually care if the misc_device cannot be registered. | |
2377 | * this driver can do its job without it, even if userspace can't | |
2378 | * control it. just log the error | |
2379 | */ | |
2380 | if (misc_register(&apm_device)) | |
2381 | printk(KERN_WARNING "apm: Could not register misc device.\n"); | |
1da177e4 LT |
2382 | |
2383 | if (HZ != 100) | |
2384 | idle_period = (idle_period * HZ) / 100; | |
2385 | if (idle_threshold < 100) { | |
f8594220 | 2386 | cpuidle_poll_state_init(&apm_idle_driver); |
dd8af076 LB |
2387 | if (!cpuidle_register_driver(&apm_idle_driver)) |
2388 | if (cpuidle_register_device(&apm_cpuidle_device)) | |
2389 | cpuidle_unregister_driver(&apm_idle_driver); | |
1da177e4 LT |
2390 | } |
2391 | ||
2392 | return 0; | |
2393 | } | |
2394 | ||
2395 | static void __exit apm_exit(void) | |
2396 | { | |
3f4380a1 | 2397 | int error; |
1da177e4 | 2398 | |
dd8af076 LB |
2399 | cpuidle_unregister_device(&apm_cpuidle_device); |
2400 | cpuidle_unregister_driver(&apm_idle_driver); | |
2401 | ||
1da177e4 LT |
2402 | if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) |
2403 | && (apm_info.connection_version > 0x0100)) { | |
2404 | error = apm_engage_power_management(APM_DEVICE_ALL, 0); | |
2405 | if (error) | |
2406 | apm_error("disengage power management", error); | |
2407 | } | |
2408 | misc_deregister(&apm_device); | |
2409 | remove_proc_entry("apm", NULL); | |
2410 | if (power_off) | |
2411 | pm_power_off = NULL; | |
fc09561d SH |
2412 | if (kapmd_task) { |
2413 | kthread_stop(kapmd_task); | |
2414 | kapmd_task = NULL; | |
2415 | } | |
1da177e4 LT |
2416 | } |
2417 | ||
2418 | module_init(apm_init); | |
2419 | module_exit(apm_exit); | |
2420 | ||
2421 | MODULE_AUTHOR("Stephen Rothwell"); | |
2422 | MODULE_DESCRIPTION("Advanced Power Management"); | |
2423 | MODULE_LICENSE("GPL"); | |
2424 | module_param(debug, bool, 0644); | |
2425 | MODULE_PARM_DESC(debug, "Enable debug mode"); | |
2426 | module_param(power_off, bool, 0444); | |
2427 | MODULE_PARM_DESC(power_off, "Enable power off"); | |
2428 | module_param(bounce_interval, int, 0444); | |
2429 | MODULE_PARM_DESC(bounce_interval, | |
2430 | "Set the number of ticks to ignore suspend bounces"); | |
2431 | module_param(allow_ints, bool, 0444); | |
2432 | MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls"); | |
2433 | module_param(broken_psr, bool, 0444); | |
2434 | MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call"); | |
2435 | module_param(realmode_power_off, bool, 0444); | |
2436 | MODULE_PARM_DESC(realmode_power_off, | |
2437 | "Switch to real mode before powering off"); | |
2438 | module_param(idle_threshold, int, 0444); | |
2439 | MODULE_PARM_DESC(idle_threshold, | |
2440 | "System idle percentage above which to make APM BIOS idle calls"); | |
2441 | module_param(idle_period, int, 0444); | |
2442 | MODULE_PARM_DESC(idle_period, | |
844ea8f6 | 2443 | "Period (in sec/100) over which to calculate the idle percentage"); |
1da177e4 LT |
2444 | module_param(smp, bool, 0444); |
2445 | MODULE_PARM_DESC(smp, | |
2446 | "Set this to enable APM use on an SMP platform. Use with caution on older systems"); | |
2447 | MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); |