1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* -*- linux-c -*- |
3 | * APM BIOS driver for Linux |
4 | * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au) |
5 | * |
6 | * Initial development of this driver was funded by NEC Australia P/L |
7 | * and NEC Corporation |
8 | * |
9 | * October 1995, Rik Faith (faith@cs.unc.edu): |
10 | * Minor enhancements and updates (to the patch set) for 1.3.x |
11 | * Documentation |
12 | * January 1996, Rik Faith (faith@cs.unc.edu): |
13 | * Make /proc/apm easy to format (bump driver version) |
14 | * March 1996, Rik Faith (faith@cs.unc.edu): |
15 | * Prohibit APM BIOS calls unless apm_enabled. |
16 | * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>) |
17 | * April 1996, Stephen Rothwell (sfr@canb.auug.org.au) |
18 | * Version 1.0 and 1.1 |
19 | * May 1996, Version 1.2 |
20 | * Feb 1998, Version 1.3 |
21 | * Feb 1998, Version 1.4 |
22 | * Aug 1998, Version 1.5 |
23 | * Sep 1998, Version 1.6 |
24 | * Nov 1998, Version 1.7 |
25 | * Jan 1999, Version 1.8 |
26 | * Jan 1999, Version 1.9 |
27 | * Oct 1999, Version 1.10 |
28 | * Nov 1999, Version 1.11 |
29 | * Jan 2000, Version 1.12 |
30 | * Feb 2000, Version 1.13 |
31 | * Nov 2000, Version 1.14 |
32 | * Oct 2001, Version 1.15 |
33 | * Jan 2002, Version 1.16 |
34 | * Oct 2002, Version 1.16ac |
35 | * |
36 | * History: |
37 | * 0.6b: first version in official kernel, Linux 1.3.46 |
38 | * 0.7: changed /proc/apm format, Linux 1.3.58 |
39 | * 0.8: fixed gcc 2.7.[12] compilation problems, Linux 1.3.59 |
40 | * 0.9: only call bios if bios is present, Linux 1.3.72 |
41 | * 1.0: use fixed device number, consolidate /proc/apm into this file, |
42 | * Linux 1.3.85 |
43 | * 1.1: support user-space standby and suspend, power off after system |
44 | * halted, Linux 1.3.98 |
45 | * 1.2: When resetting RTC after resume, take care so that the time |
46 | * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth |
47 | * <jtoth@princeton.edu>); improve interaction between |
48 | * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4 |
49 | * 1.2a:Simple change to stop mysterious bug reports with SMP also added |
50 | * levels to the printk calls. APM is not defined for SMP machines. |
51 | * The new replacement for it is, but Linux doesn't yet support this. |
52 | * Alan Cox Linux 2.1.55 |
53 | * 1.3: Set up a valid data descriptor 0x40 for buggy BIOS's |
54 | * 1.4: Upgraded to support APM 1.2. Integrated ThinkPad suspend patch by |
55 | * Dean Gaudet <dgaudet@arctic.org>. |
56 | * C. Scott Ananian <cananian@alumni.princeton.edu> Linux 2.1.87 |
57 | * 1.5: Fix segment register reloading (in case of bad segments saved |
58 | * across BIOS call). |
59 | * Stephen Rothwell |
60 | * 1.6: Cope with compiler/assembler differences. |
61 | * Only try to turn off the first display device. |
62 | * Fix OOPS at power off with no APM BIOS by Jan Echternach |
63 | * <echter@informatik.uni-rostock.de> |
64 | * Stephen Rothwell |
65 | * 1.7: Modify driver's cached copy of the disabled/disengaged flags |
66 | * to reflect current state of APM BIOS. |
67 | * Chris Rankin <rankinc@bellsouth.net> |
68 | * Reset interrupt 0 timer to 100Hz after suspend |
69 | * Chad Miller <cmiller@surfsouth.com> |
70 | * Add CONFIG_APM_IGNORE_SUSPEND_BOUNCE |
71 | * Richard Gooch <rgooch@atnf.csiro.au> |
72 | * Allow boot time disabling of APM |
73 | * Make boot messages far less verbose by default |
74 | * Make asm safer |
75 | * Stephen Rothwell |
76 | * 1.8: Add CONFIG_APM_RTC_IS_GMT |
77 | * Richard Gooch <rgooch@atnf.csiro.au> |
78 | * change APM_NOINTS to CONFIG_APM_ALLOW_INTS |
79 | * remove dependency on CONFIG_PROC_FS |
80 | * Stephen Rothwell |
81 | * 1.9: Fix small typo. <laslo@wodip.opole.pl> |
82 | * Try to cope with BIOS's that need to have all display |
83 | * devices blanked and not just the first one. |
84 | * Ross Paterson <ross@soi.city.ac.uk> |
85 | * Fix segment limit setting it has always been wrong as |
86 | * the segments needed to have byte granularity. |
87 | * Mark a few things __init. |
88 | * Add hack to allow power off of SMP systems by popular request. |
89 | * Use CONFIG_SMP instead of __SMP__ |
90 | * Ignore BOUNCES for three seconds. |
91 | * Stephen Rothwell |
92 | * 1.10: Fix for Thinkpad return code. |
93 | * Merge 2.2 and 2.3 drivers. |
94 | * Remove APM dependencies in arch/i386/kernel/process.c |
95 | * Remove APM dependencies in drivers/char/sysrq.c |
96 | * Reset time across standby. |
97 | * Allow more initialisation on SMP. |
98 | * Remove CONFIG_APM_POWER_OFF and make it boot time |
99 | * configurable (default on). |
100 | * Make debug only a boot time parameter (remove APM_DEBUG). |
101 | * Try to blank all devices on any error. |
102 | * 1.11: Remove APM dependencies in drivers/char/console.c |
103 | * Check nr_running to detect if we are idle (from |
104 | * Borislav Deianov <borislav@lix.polytechnique.fr>) |
105 | * Fix for bioses that don't zero the top part of the |
106 | * entrypoint offset (Mario Sitta <sitta@al.unipmn.it>) |
107 | * (reported by Panos Katsaloulis <teras@writeme.com>). |
108 | * Real mode power off patch (Walter Hofmann |
109 | * <Walter.Hofmann@physik.stud.uni-erlangen.de>). |
110 | * 1.12: Remove CONFIG_SMP as the compiler will optimize |
111 | * the code away anyway (smp_num_cpus == 1 in UP) |
112 | * noted by Artur Skawina <skawina@geocities.com>. |
113 | * Make power off under SMP work again. |
114 | * Fix thinko with initial engaging of BIOS. |
115 | * Make sure power off only happens on CPU 0 |
116 | * (Paul "Rusty" Russell <rusty@rustcorp.com.au>). |
117 | * Do error notification to user mode if BIOS calls fail. |
118 | * Move entrypoint offset fix to ...boot/setup.S |
119 | * where it belongs (Cosmos <gis88564@cis.nctu.edu.tw>). |
120 | * Remove smp-power-off. SMP users must now specify |
121 | * "apm=power-off" on the kernel command line. Suggested |
122 | * by Jim Avera <jima@hal.com>, modified by Alan Cox |
123 | * <alan@lxorguk.ukuu.org.uk>. |
124 | * Register the /proc/apm entry even on SMP so that |
125 | * scripts that check for it before doing power off |
126 | * work (Jim Avera <jima@hal.com>). |
127 | * 1.13: Changes for new pm_ interfaces (Andy Henroid |
128 | * <andy_henroid@yahoo.com>). |
129 | * Modularize the code. |
130 | * Fix the Thinkpad (again) :-( (CONFIG_APM_IGNORE_MULTIPLE_SUSPENDS |
131 | * is now the way life works). |
132 | * Fix thinko in suspend() (wrong return). |
133 | * Notify drivers on critical suspend. |
134 | * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz> |
135 | * modified by sfr). |
136 | * Disable interrupts while we are suspended (Andy Henroid |
137 | * <andy_henroid@yahoo.com> fixed by sfr). |
138 | * Make power off work on SMP again (Tony Hoyle |
139 | * <tmh@magenta-logic.com> and <zlatko@iskon.hr>) modified by sfr. |
140 | * Remove CONFIG_APM_SUSPEND_BOUNCE. The bounce ignore |
141 | * interval is now configurable. |
142 | * 1.14: Make connection version persist across module unload/load. |
143 | * Enable and engage power management earlier. |
144 | * Disengage power management on module unload. |
145 | * Changed to use the sysrq-register hack for registering the |
146 | * power off function called by magic sysrq based upon discussions |
147 | * in irc://irc.openprojects.net/#kernelnewbies |
148 | * (Crutcher Dunnavant <crutcher+kernel@datastacks.com>). |
149 | * Make CONFIG_APM_REAL_MODE_POWER_OFF run time configurable. |
150 | * (Arjan van de Ven <arjanv@redhat.com>) modified by sfr. |
151 | * Work around byte swap bug in one of the Vaio's BIOS's |
152 | * (Marc Boucher <marc@mbsi.ca>). |
153 | * Exposed the disable flag to dmi so that we can handle known |
154 | * broken APM (Alan Cox <alan@lxorguk.ukuu.org.uk>). |
155 | * 1.14ac: If the BIOS says "I slowed the CPU down" then don't spin |
156 | * calling it - instead idle. (Alan Cox <alan@lxorguk.ukuu.org.uk>) |
157 | * If an APM idle fails log it and idle sensibly |
158 | * 1.15: Don't queue events to clients who open the device O_WRONLY. |
159 | * Don't expect replies from clients who open the device O_RDONLY. |
160 | * (Idea from Thomas Hood) |
161 | * Minor waitqueue cleanups. (John Fremlin <chief@bandits.org>) |
162 | * 1.16: Fix idle calling. (Andreas Steinmetz <ast@domdv.de> et al.) |
163 | * Notify listeners of standby or suspend events before notifying |
164 | * drivers. Return EBUSY to ioctl() if suspend is rejected. |
165 | * (Russell King <rmk@arm.linux.org.uk> and Thomas Hood) |
166 | * Ignore first resume after we generate our own resume event |
167 | * after a suspend (Thomas Hood) |
168 | * Daemonize now gets rid of our controlling terminal (sfr). |
169 | * CONFIG_APM_CPU_IDLE now just affects the default value of |
170 | * idle_threshold (sfr). |
171 | * Change name of kernel apm daemon (as it no longer idles) (sfr). |
172 | * 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we |
173 | * make _all_ APM calls on the CPU#0. Fix unsafe sign bug. |
174 | * TODO: determine if its "boot CPU" or "CPU0" we want to lock to. |
175 | * |
176 | * APM 1.1 Reference: |
177 | * |
178 | * Intel Corporation, Microsoft Corporation. Advanced Power Management |
179 | * (APM) BIOS Interface Specification, Revision 1.1, September 1993. |
180 | * Intel Order Number 241704-001. Microsoft Part Number 781-110-X01. |
181 | * |
182 | * [This document is available free from Intel by calling 800.628.8686 (fax |
183 | * 916.356.6100) or 800.548.4725; or from |
184 | * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also |
185 | * available from Microsoft by calling 206.882.8080.] |
186 | * |
187 | * APM 1.2 Reference: |
188 | * Intel Corporation, Microsoft Corporation. Advanced Power Management |
189 | * (APM) BIOS Interface Specification, Revision 1.2, February 1996. |
190 | * |
191 | * [This document is available from Microsoft at: |
192 | * http://www.microsoft.com/whdc/archive/amp_12.mspx] |
193 | */ |
194 | |
195 | #define pr_fmt(fmt) "apm: " fmt |
196 | |
197 | #include <linux/module.h> |
198 | |
199 | #include <linux/poll.h> |
200 | #include <linux/types.h> |
201 | #include <linux/stddef.h> |
202 | #include <linux/timer.h> |
203 | #include <linux/fcntl.h> |
204 | #include <linux/slab.h> |
205 | #include <linux/stat.h> |
206 | #include <linux/proc_fs.h> |
207 | #include <linux/seq_file.h> |
208 | #include <linux/miscdevice.h> |
209 | #include <linux/apm_bios.h> |
210 | #include <linux/init.h> |
211 | #include <linux/time.h> |
212 | #include <linux/sched/signal.h> |
213 | #include <linux/sched/cputime.h> |
214 | #include <linux/pm.h> |
215 | #include <linux/capability.h> |
216 | #include <linux/device.h> |
217 | #include <linux/kernel.h> |
218 | #include <linux/freezer.h> |
219 | #include <linux/smp.h> |
220 | #include <linux/dmi.h> |
221 | #include <linux/suspend.h> |
222 | #include <linux/kthread.h> |
223 | #include <linux/jiffies.h> |
224 | #include <linux/acpi.h> |
225 | #include <linux/syscore_ops.h> |
226 | #include <linux/i8253.h> |
227 | #include <linux/cpuidle.h> |
228 | |
229 | #include <linux/uaccess.h> |
230 | #include <asm/desc.h> |
231 | #include <asm/olpc.h> |
232 | #include <asm/paravirt.h> |
233 | #include <asm/reboot.h> |
234 | #include <asm/nospec-branch.h> |
235 | #include <asm/ibt.h> |
236 | |
237 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
238 | extern int (*console_blank_hook)(int); |
239 | #endif |
240 | |
241 | /* |
242 | * Various options can be changed at boot time as follows: |
243 | * (We allow underscores for compatibility with the modules code) |
244 | * apm=on/off enable/disable APM |
245 | * [no-]allow[-_]ints allow interrupts during BIOS calls |
246 | * [no-]broken[-_]psr BIOS has a broken GetPowerStatus call |
247 | * [no-]realmode[-_]power[-_]off switch to real mode before |
248 | * powering off |
249 | * [no-]debug log some debugging messages |
250 | * [no-]power[-_]off power off on shutdown |
251 | * [no-]smp Use apm even on an SMP box |
252 | * bounce[-_]interval=<n> number of ticks to ignore suspend |
253 | * bounces |
254 | * idle[-_]threshold=<n> System idle percentage above which to |
255 | * make APM BIOS idle calls. Set it to |
256 | * 100 to disable. |
257 | * idle[-_]period=<n> Period (in 1/100s of a second) over |
258 | * which the idle percentage is |
259 | * calculated. |
260 | */ |
261 | |
262 | /* KNOWN PROBLEM MACHINES: |
263 | * |
264 | * U: TI 4000M TravelMate: BIOS is *NOT* APM compliant |
265 | * [Confirmed by TI representative] |
266 | * ?: ACER 486DX4/75: uses dseg 0040, in violation of APM specification |
267 | * [Confirmed by BIOS disassembly] |
268 | * [This may work now ...] |
269 | * P: Toshiba 1950S: battery life information only gets updated after resume |
270 | * P: Midwest Micro Soundbook Elite DX2/66 monochrome: screen blanking |
271 | * broken in BIOS [Reported by Garst R. Reese <reese@isn.net>] |
272 | * ?: AcerNote-950: oops on reading /proc/apm - workaround is a WIP |
273 | * Neale Banks <neale@lowendale.com.au> December 2000 |
274 | * |
275 | * Legend: U = unusable with APM patches |
276 | * P = partially usable with APM patches |
277 | */ |
278 | |
279 | /* |
280 | * Define as 1 to make the driver always call the APM BIOS busy |
281 | * routine even if the clock was not reported as slowed by the |
282 | * idle routine. Otherwise, define as 0. |
283 | */ |
284 | #define ALWAYS_CALL_BUSY 1 |
285 | |
286 | /* |
287 | * Define to make the APM BIOS calls zero all data segment registers (so |
288 | * that an incorrect BIOS implementation will cause a kernel panic if it |
289 | * tries to write to arbitrary memory). |
290 | */ |
291 | #define APM_ZERO_SEGS |
292 | |
293 | #include <asm/apm.h> |
294 | |
295 | /* |
296 | * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend. |
297 | * This patched by Chad Miller <cmiller@surfsouth.com>, original code by |
298 | * David Chen <chen@ctpa04.mit.edu> |
299 | */ |
300 | #undef INIT_TIMER_AFTER_SUSPEND |
301 | |
302 | #ifdef INIT_TIMER_AFTER_SUSPEND |
303 | #include <linux/timex.h> |
304 | #include <asm/io.h> |
305 | #include <linux/delay.h> |
306 | #endif |
307 | |
308 | /* |
309 | * Need to poll the APM BIOS every second |
310 | */ |
311 | #define APM_CHECK_TIMEOUT (HZ) |
312 | |
313 | /* |
314 | * Ignore suspend events for this amount of time after a resume |
315 | */ |
316 | #define DEFAULT_BOUNCE_INTERVAL (3 * HZ) |
317 | |
318 | /* |
319 | * Maximum number of events stored |
320 | */ |
321 | #define APM_MAX_EVENTS 20 |
322 | |
323 | /* |
324 | * The per-file APM data |
325 | */ |
326 | struct apm_user { |
327 | int magic; |
328 | struct apm_user *next; |
329 | unsigned int suser: 1; |
330 | unsigned int writer: 1; |
331 | unsigned int reader: 1; |
332 | unsigned int suspend_wait: 1; |
333 | int suspend_result; |
334 | int suspends_pending; |
335 | int standbys_pending; |
336 | int suspends_read; |
337 | int standbys_read; |
338 | int event_head; |
339 | int event_tail; |
340 | apm_event_t events[APM_MAX_EVENTS]; |
341 | }; |
342 | |
343 | /* |
344 | * The magic number in apm_user |
345 | */ |
346 | #define APM_BIOS_MAGIC 0x4101 |
347 | |
348 | /* |
349 | * idle percentage above which bios idle calls are done |
350 | */ |
351 | #ifdef CONFIG_APM_CPU_IDLE |
352 | #define DEFAULT_IDLE_THRESHOLD 95 |
353 | #else |
354 | #define DEFAULT_IDLE_THRESHOLD 100 |
355 | #endif |
356 | #define DEFAULT_IDLE_PERIOD (100 / 3) |
357 | |
358 | static int apm_cpu_idle(struct cpuidle_device *dev, |
359 | struct cpuidle_driver *drv, int index); |
360 | |
361 | static struct cpuidle_driver apm_idle_driver = { |
362 | .name = "apm_idle" , |
363 | .owner = THIS_MODULE, |
364 | .states = { |
365 | { /* entry 0 is for polling */ }, |
366 | { /* entry 1 is for APM idle */ |
367 | .name = "APM" , |
368 | .desc = "APM idle" , |
369 | .exit_latency = 250, /* WAG */ |
370 | .target_residency = 500, /* WAG */ |
371 | .enter = &apm_cpu_idle |
372 | }, |
373 | }, |
374 | .state_count = 2, |
375 | }; |
376 | |
377 | static struct cpuidle_device apm_cpuidle_device; |
378 | |
379 | /* |
380 | * Local variables |
381 | */ |
382 | __visible struct { |
383 | unsigned long offset; |
384 | unsigned short segment; |
385 | } apm_bios_entry; |
386 | static int clock_slowed; |
387 | static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD; |
388 | static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD; |
389 | static int suspends_pending; |
390 | static int standbys_pending; |
391 | static int ignore_sys_suspend; |
392 | static int ignore_normal_resume; |
393 | static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL; |
394 | |
395 | static bool debug __read_mostly; |
396 | static bool smp __read_mostly; |
397 | static int apm_disabled = -1; |
398 | #ifdef CONFIG_SMP |
399 | static bool power_off; |
400 | #else |
401 | static bool power_off = 1; |
402 | #endif |
403 | static bool realmode_power_off; |
404 | #ifdef CONFIG_APM_ALLOW_INTS |
405 | static bool allow_ints = 1; |
406 | #else |
407 | static bool allow_ints; |
408 | #endif |
409 | static bool broken_psr; |
410 | |
411 | static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); |
412 | static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); |
413 | static struct apm_user *user_list; |
414 | static DEFINE_SPINLOCK(user_list_lock); |
415 | static DEFINE_MUTEX(apm_mutex); |
416 | |
417 | /* |
418 | * Set up a segment that references the real mode segment 0x40 |
419 | * that extends up to the end of page zero (that we have reserved). |
420 | * This is for buggy BIOS's that refer to (real mode) segment 0x40 |
421 | * even though they are called in protected mode. |
422 | */ |
423 | static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS, |
424 | (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); |
425 | |
426 | static const char driver_version[] = "1.16ac" ; /* no spaces */ |
427 | |
428 | static struct task_struct *kapmd_task; |
429 | |
430 | /* |
431 | * APM event names taken from the APM 1.2 specification. These are |
432 | * the message codes that the BIOS uses to tell us about events |
433 | */ |
434 | static const char * const apm_event_name[] = { |
435 | "system standby" , |
436 | "system suspend" , |
437 | "normal resume" , |
438 | "critical resume" , |
439 | "low battery" , |
440 | "power status change" , |
441 | "update time" , |
442 | "critical suspend" , |
443 | "user standby" , |
444 | "user suspend" , |
445 | "system standby resume" , |
446 | "capabilities change" |
447 | }; |
448 | #define NR_APM_EVENT_NAME ARRAY_SIZE(apm_event_name) |
449 | |
450 | typedef struct lookup_t { |
451 | int key; |
452 | char *msg; |
453 | } lookup_t; |
454 | |
455 | /* |
456 | * The BIOS returns a set of standard error codes in AX when the |
457 | * carry flag is set. |
458 | */ |
459 | |
460 | static const lookup_t error_table[] = { |
461 | /* N/A { APM_SUCCESS, "Operation succeeded" }, */ |
462 | { APM_DISABLED, "Power management disabled" }, |
463 | { APM_CONNECTED, "Real mode interface already connected" }, |
464 | { APM_NOT_CONNECTED, "Interface not connected" }, |
465 | { APM_16_CONNECTED, "16 bit interface already connected" }, |
466 | /* N/A { APM_16_UNSUPPORTED, "16 bit interface not supported" }, */ |
467 | { APM_32_CONNECTED, "32 bit interface already connected" }, |
468 | { APM_32_UNSUPPORTED, "32 bit interface not supported" }, |
469 | { APM_BAD_DEVICE, "Unrecognized device ID" }, |
470 | { APM_BAD_PARAM, "Parameter out of range" }, |
471 | { APM_NOT_ENGAGED, "Interface not engaged" }, |
472 | { APM_BAD_FUNCTION, "Function not supported" }, |
473 | { APM_RESUME_DISABLED, "Resume timer disabled" }, |
474 | { APM_BAD_STATE, "Unable to enter requested state" }, |
475 | /* N/A { APM_NO_EVENTS, "No events pending" }, */ |
476 | { APM_NO_ERROR, "BIOS did not set a return code" }, |
477 | { APM_NOT_PRESENT, "No APM present" } |
478 | }; |
479 | #define ERROR_COUNT ARRAY_SIZE(error_table) |
480 | |
481 | /** |
482 | * apm_error - display an APM error |
483 | * @str: information string |
484 | * @err: APM BIOS return code |
485 | * |
486 | * Write a meaningful log entry to the kernel log in the event of |
487 | * an APM error. Note that this also handles (negative) kernel errors. |
488 | */ |
489 | |
490 | static void apm_error(char *str, int err) |
491 | { |
492 | int i; |
493 | |
494 | for (i = 0; i < ERROR_COUNT; i++) |
495 | if (error_table[i].key == err) |
496 | break; |
497 | if (i < ERROR_COUNT) |
498 | pr_notice("%s: %s\n" , str, error_table[i].msg); |
499 | else if (err < 0) |
500 | pr_notice("%s: linux error code %i\n" , str, err); |
501 | else |
502 | pr_notice("%s: unknown error code %#2.2x\n" , |
503 | str, err); |
504 | } |
505 | |
506 | /* |
507 | * These are the actual BIOS calls. Depending on APM_ZERO_SEGS and |
508 | * apm_info.allow_ints, we are being really paranoid here! Not only |
509 | * are interrupts disabled, but all the segment registers (except SS) |
510 | * are saved and zeroed this means that if the BIOS tries to reference |
511 | * any data without explicitly loading the segment registers, the kernel |
512 | * will fault immediately rather than have some unforeseen circumstances |
513 | * for the rest of the kernel. And it will be very obvious! :-) Doing |
514 | * this depends on CS referring to the same physical memory as DS so that |
515 | * DS can be zeroed before the call. Unfortunately, we can't do anything |
516 | * about the stack segment/pointer. Also, we tell the compiler that |
517 | * everything could change. |
518 | * |
519 | * Also, we KNOW that for the non error case of apm_bios_call, there |
520 | * is no useful data returned in the low order 8 bits of eax. |
521 | */ |
522 | |
523 | static inline unsigned long __apm_irq_save(void) |
524 | { |
525 | unsigned long flags; |
526 | local_save_flags(flags); |
527 | if (apm_info.allow_ints) { |
528 | if (irqs_disabled_flags(flags)) |
529 | local_irq_enable(); |
530 | } else |
531 | local_irq_disable(); |
532 | |
533 | return flags; |
534 | } |
535 | |
536 | #define apm_irq_save(flags) \ |
537 | do { flags = __apm_irq_save(); } while (0) |
538 | |
539 | static inline void apm_irq_restore(unsigned long flags) |
540 | { |
541 | if (irqs_disabled_flags(flags)) |
542 | local_irq_disable(); |
543 | else if (irqs_disabled()) |
544 | local_irq_enable(); |
545 | } |
546 | |
547 | #ifdef APM_ZERO_SEGS |
548 | # define APM_DECL_SEGS \ |
549 | unsigned int saved_fs; unsigned int saved_gs; |
550 | # define APM_DO_SAVE_SEGS \ |
551 | savesegment(fs, saved_fs); savesegment(gs, saved_gs) |
552 | # define APM_DO_RESTORE_SEGS \ |
553 | loadsegment(fs, saved_fs); loadsegment(gs, saved_gs) |
554 | #else |
555 | # define APM_DECL_SEGS |
556 | # define APM_DO_SAVE_SEGS |
557 | # define APM_DO_RESTORE_SEGS |
558 | #endif |
559 | |
560 | struct apm_bios_call { |
561 | u32 func; |
562 | /* In and out */ |
563 | u32 ebx; |
564 | u32 ecx; |
565 | /* Out only */ |
566 | u32 eax; |
567 | u32 edx; |
568 | u32 esi; |
569 | |
570 | /* Error: -ENOMEM, or bits 8-15 of eax */ |
571 | int err; |
572 | }; |
573 | |
574 | /** |
575 | * __apm_bios_call - Make an APM BIOS 32bit call |
576 | * @_call: pointer to struct apm_bios_call. |
577 | * |
578 | * Make an APM call using the 32bit protected mode interface. The |
579 | * caller is responsible for knowing if APM BIOS is configured and |
580 | * enabled. This call can disable interrupts for a long period of |
581 | * time on some laptops. The return value is in AH and the carry |
582 | * flag is loaded into AL. If there is an error, then the error |
583 | * code is returned in AH (bits 8-15 of eax) and this function |
584 | * returns non-zero. |
585 | * |
586 | * Note: this makes the call on the current CPU. |
587 | */ |
588 | static long __apm_bios_call(void *_call) |
589 | { |
590 | APM_DECL_SEGS |
591 | unsigned long flags; |
592 | int cpu; |
593 | struct desc_struct save_desc_40; |
594 | struct desc_struct *gdt; |
595 | struct apm_bios_call *call = _call; |
596 | u64 ibt; |
597 | |
598 | cpu = get_cpu(); |
599 | BUG_ON(cpu != 0); |
600 | gdt = get_cpu_gdt_rw(cpu); |
601 | save_desc_40 = gdt[0x40 / 8]; |
602 | gdt[0x40 / 8] = bad_bios_desc; |
603 | |
604 | apm_irq_save(flags); |
605 | firmware_restrict_branch_speculation_start(); |
606 | ibt = ibt_save(disable: true); |
607 | APM_DO_SAVE_SEGS; |
608 | apm_bios_call_asm(func: call->func, ebx_in: call->ebx, ecx_in: call->ecx, |
609 | eax: &call->eax, ebx: &call->ebx, ecx: &call->ecx, edx: &call->edx, |
610 | esi: &call->esi); |
611 | APM_DO_RESTORE_SEGS; |
612 | ibt_restore(save: ibt); |
613 | firmware_restrict_branch_speculation_end(); |
614 | apm_irq_restore(flags); |
615 | gdt[0x40 / 8] = save_desc_40; |
616 | put_cpu(); |
617 | |
618 | return call->eax & 0xff; |
619 | } |
620 | |
621 | /* Run __apm_bios_call or __apm_bios_call_simple on CPU 0 */ |
622 | static int on_cpu0(long (*fn)(void *), struct apm_bios_call *call) |
623 | { |
624 | int ret; |
625 | |
626 | /* Don't bother with work_on_cpu in the common case, so we don't |
627 | * have to worry about OOM or overhead. */ |
628 | if (get_cpu() == 0) { |
629 | ret = fn(call); |
630 | put_cpu(); |
631 | } else { |
632 | put_cpu(); |
633 | ret = work_on_cpu(0, fn, call); |
634 | } |
635 | |
636 | /* work_on_cpu can fail with -ENOMEM */ |
637 | if (ret < 0) |
638 | call->err = ret; |
639 | else |
640 | call->err = (call->eax >> 8) & 0xff; |
641 | |
642 | return ret; |
643 | } |
644 | |
645 | /** |
646 | * apm_bios_call - Make an APM BIOS 32bit call (on CPU 0) |
647 | * @call: the apm_bios_call registers. |
648 | * |
649 | * If there is an error, it is returned in @call.err. |
650 | */ |
651 | static int apm_bios_call(struct apm_bios_call *call) |
652 | { |
653 | return on_cpu0(fn: __apm_bios_call, call); |
654 | } |
655 | |
656 | /** |
657 | * __apm_bios_call_simple - Make an APM BIOS 32bit call (on CPU 0) |
658 | * @_call: pointer to struct apm_bios_call. |
659 | * |
660 | * Make a BIOS call that returns one value only, or just status. |
661 | * If there is an error, then the error code is returned in AH |
662 | * (bits 8-15 of eax) and this function returns non-zero (it can |
663 | * also return -ENOMEM). This is used for simpler BIOS operations. |
664 | * This call may hold interrupts off for a long time on some laptops. |
665 | * |
666 | * Note: this makes the call on the current CPU. |
667 | */ |
668 | static long __apm_bios_call_simple(void *_call) |
669 | { |
670 | u8 error; |
671 | APM_DECL_SEGS |
672 | unsigned long flags; |
673 | int cpu; |
674 | struct desc_struct save_desc_40; |
675 | struct desc_struct *gdt; |
676 | struct apm_bios_call *call = _call; |
677 | u64 ibt; |
678 | |
679 | cpu = get_cpu(); |
680 | BUG_ON(cpu != 0); |
681 | gdt = get_cpu_gdt_rw(cpu); |
682 | save_desc_40 = gdt[0x40 / 8]; |
683 | gdt[0x40 / 8] = bad_bios_desc; |
684 | |
685 | apm_irq_save(flags); |
686 | firmware_restrict_branch_speculation_start(); |
687 | ibt = ibt_save(disable: true); |
688 | APM_DO_SAVE_SEGS; |
689 | error = apm_bios_call_simple_asm(func: call->func, ebx_in: call->ebx, ecx_in: call->ecx, |
690 | eax: &call->eax); |
691 | APM_DO_RESTORE_SEGS; |
692 | ibt_restore(save: ibt); |
693 | firmware_restrict_branch_speculation_end(); |
694 | apm_irq_restore(flags); |
695 | gdt[0x40 / 8] = save_desc_40; |
696 | put_cpu(); |
697 | return error; |
698 | } |
699 | |
700 | /** |
701 | * apm_bios_call_simple - make a simple APM BIOS 32bit call |
702 | * @func: APM function to invoke |
703 | * @ebx_in: EBX register value for BIOS call |
704 | * @ecx_in: ECX register value for BIOS call |
705 | * @eax: EAX register on return from the BIOS call |
706 | * @err: bits |
707 | * |
708 | * Make a BIOS call that returns one value only, or just status. |
709 | * If there is an error, then the error code is returned in @err |
710 | * and this function returns non-zero. This is used for simpler |
711 | * BIOS operations. This call may hold interrupts off for a long |
712 | * time on some laptops. |
713 | */ |
714 | static int apm_bios_call_simple(u32 func, u32 ebx_in, u32 ecx_in, u32 *eax, |
715 | int *err) |
716 | { |
717 | struct apm_bios_call call; |
718 | int ret; |
719 | |
720 | call.func = func; |
721 | call.ebx = ebx_in; |
722 | call.ecx = ecx_in; |
723 | |
724 | ret = on_cpu0(fn: __apm_bios_call_simple, call: &call); |
725 | *eax = call.eax; |
726 | *err = call.err; |
727 | return ret; |
728 | } |
729 | |
730 | /** |
731 | * apm_driver_version - APM driver version |
732 | * @val: loaded with the APM version on return |
733 | * |
734 | * Retrieve the APM version supported by the BIOS. This is only |
735 | * supported for APM 1.1 or higher. An error indicates APM 1.0 is |
736 | * probably present. |
737 | * |
738 | * On entry val should point to a value indicating the APM driver |
739 | * version with the high byte being the major and the low byte the |
740 | * minor number both in BCD |
741 | * |
742 | * On return it will hold the BIOS revision supported in the |
743 | * same format. |
744 | */ |
745 | |
746 | static int apm_driver_version(u_short *val) |
747 | { |
748 | u32 eax; |
749 | int err; |
750 | |
751 | if (apm_bios_call_simple(APM_FUNC_VERSION, ebx_in: 0, ecx_in: *val, eax: &eax, err: &err)) |
752 | return err; |
753 | *val = eax; |
754 | return APM_SUCCESS; |
755 | } |
756 | |
757 | /** |
758 | * apm_get_event - get an APM event from the BIOS |
759 | * @event: pointer to the event |
760 | * @info: point to the event information |
761 | * |
762 | * The APM BIOS provides a polled information for event |
763 | * reporting. The BIOS expects to be polled at least every second |
764 | * when events are pending. When a message is found the caller should |
765 | * poll until no more messages are present. However, this causes |
766 | * problems on some laptops where a suspend event notification is |
767 | * not cleared until it is acknowledged. |
768 | * |
769 | * Additional information is returned in the info pointer, providing |
770 | * that APM 1.2 is in use. If no messages are pending the value 0x80 |
771 | * is returned (No power management events pending). |
772 | */ |
773 | static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) |
774 | { |
775 | struct apm_bios_call call; |
776 | |
777 | call.func = APM_FUNC_GET_EVENT; |
778 | call.ebx = call.ecx = 0; |
779 | |
780 | if (apm_bios_call(call: &call)) |
781 | return call.err; |
782 | |
783 | *event = call.ebx; |
784 | if (apm_info.connection_version < 0x0102) |
785 | *info = ~0; /* indicate info not valid */ |
786 | else |
787 | *info = call.ecx; |
788 | return APM_SUCCESS; |
789 | } |
790 | |
791 | /** |
792 | * set_power_state - set the power management state |
793 | * @what: which items to transition |
794 | * @state: state to transition to |
795 | * |
796 | * Request an APM change of state for one or more system devices. The |
797 | * processor state must be transitioned last of all. what holds the |
798 | * class of device in the upper byte and the device number (0xFF for |
799 | * all) for the object to be transitioned. |
800 | * |
801 | * The state holds the state to transition to, which may in fact |
802 | * be an acceptance of a BIOS requested state change. |
803 | */ |
804 | |
805 | static int set_power_state(u_short what, u_short state) |
806 | { |
807 | u32 eax; |
808 | int err; |
809 | |
810 | if (apm_bios_call_simple(APM_FUNC_SET_STATE, ebx_in: what, ecx_in: state, eax: &eax, err: &err)) |
811 | return err; |
812 | return APM_SUCCESS; |
813 | } |
814 | |
815 | /** |
816 | * set_system_power_state - set system wide power state |
817 | * @state: which state to enter |
818 | * |
819 | * Transition the entire system into a new APM power state. |
820 | */ |
821 | |
822 | static int set_system_power_state(u_short state) |
823 | { |
824 | return set_power_state(APM_DEVICE_ALL, state); |
825 | } |
826 | |
827 | /** |
828 | * apm_do_idle - perform power saving |
829 | * |
830 | * This function notifies the BIOS that the processor is (in the view |
831 | * of the OS) idle. It returns -1 in the event that the BIOS refuses |
832 | * to handle the idle request. On a success the function returns 1 |
833 | * if the BIOS did clock slowing or 0 otherwise. |
834 | */ |
835 | |
836 | static int apm_do_idle(void) |
837 | { |
838 | u32 eax; |
839 | u8 ret = 0; |
840 | int idled = 0; |
841 | int err = 0; |
842 | |
843 | if (!need_resched()) { |
844 | idled = 1; |
845 | ret = apm_bios_call_simple(APM_FUNC_IDLE, ebx_in: 0, ecx_in: 0, eax: &eax, err: &err); |
846 | } |
847 | |
848 | if (!idled) |
849 | return 0; |
850 | |
851 | if (ret) { |
852 | static unsigned long t; |
853 | |
854 | /* This always fails on some SMP boards running UP kernels. |
855 | * Only report the failure the first 5 times. |
856 | */ |
857 | if (++t < 5) { |
858 | printk(KERN_DEBUG "apm_do_idle failed (%d)\n" , err); |
859 | t = jiffies; |
860 | } |
861 | return -1; |
862 | } |
863 | clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0; |
864 | return clock_slowed; |
865 | } |
866 | |
867 | /** |
868 | * apm_do_busy - inform the BIOS the CPU is busy |
869 | * |
870 | * Request that the BIOS brings the CPU back to full performance. |
871 | */ |
872 | |
873 | static void apm_do_busy(void) |
874 | { |
875 | u32 dummy; |
876 | int err; |
877 | |
878 | if (clock_slowed || ALWAYS_CALL_BUSY) { |
879 | (void)apm_bios_call_simple(APM_FUNC_BUSY, ebx_in: 0, ecx_in: 0, eax: &dummy, err: &err); |
880 | clock_slowed = 0; |
881 | } |
882 | } |
883 | |
884 | /* |
885 | * If no process has really been interested in |
886 | * the CPU for some time, we want to call BIOS |
887 | * power management - we probably want |
888 | * to conserve power. |
889 | */ |
890 | #define IDLE_CALC_LIMIT (HZ * 100) |
891 | #define IDLE_LEAKY_MAX 16 |
892 | |
893 | /** |
894 | * apm_cpu_idle - cpu idling for APM capable Linux |
895 | * |
896 | * This is the idling function the kernel executes when APM is available. It |
897 | * tries to do BIOS powermanagement based on the average system idle time. |
898 | * Furthermore it calls the system default idle routine. |
899 | */ |
900 | |
901 | static int apm_cpu_idle(struct cpuidle_device *dev, |
902 | struct cpuidle_driver *drv, int index) |
903 | { |
904 | static int use_apm_idle; /* = 0 */ |
905 | static unsigned int last_jiffies; /* = 0 */ |
906 | static u64 last_stime; /* = 0 */ |
907 | u64 stime, utime; |
908 | |
909 | int apm_idle_done = 0; |
910 | unsigned int jiffies_since_last_check = jiffies - last_jiffies; |
911 | unsigned int bucket; |
912 | |
913 | recalc: |
914 | task_cputime(current, utime: &utime, stime: &stime); |
915 | if (jiffies_since_last_check > IDLE_CALC_LIMIT) { |
916 | use_apm_idle = 0; |
917 | } else if (jiffies_since_last_check > idle_period) { |
918 | unsigned int idle_percentage; |
919 | |
920 | idle_percentage = nsecs_to_jiffies(n: stime - last_stime); |
921 | idle_percentage *= 100; |
922 | idle_percentage /= jiffies_since_last_check; |
923 | use_apm_idle = (idle_percentage > idle_threshold); |
924 | if (apm_info.forbid_idle) |
925 | use_apm_idle = 0; |
926 | } |
927 | |
928 | last_jiffies = jiffies; |
929 | last_stime = stime; |
930 | |
931 | bucket = IDLE_LEAKY_MAX; |
932 | |
933 | while (!need_resched()) { |
934 | if (use_apm_idle) { |
935 | unsigned int t; |
936 | |
937 | t = jiffies; |
938 | switch (apm_do_idle()) { |
939 | case 0: |
940 | apm_idle_done = 1; |
941 | if (t != jiffies) { |
942 | if (bucket) { |
943 | bucket = IDLE_LEAKY_MAX; |
944 | continue; |
945 | } |
946 | } else if (bucket) { |
947 | bucket--; |
948 | continue; |
949 | } |
950 | break; |
951 | case 1: |
952 | apm_idle_done = 1; |
953 | break; |
954 | default: /* BIOS refused */ |
955 | break; |
956 | } |
957 | } |
958 | default_idle(); |
959 | local_irq_disable(); |
960 | jiffies_since_last_check = jiffies - last_jiffies; |
961 | if (jiffies_since_last_check > idle_period) |
962 | goto recalc; |
963 | } |
964 | |
965 | if (apm_idle_done) |
966 | apm_do_busy(); |
967 | |
968 | return index; |
969 | } |
970 | |
971 | /** |
972 | * apm_power_off - ask the BIOS to power off |
973 | * |
974 | * Handle the power off sequence. This is the one piece of code we |
975 | * will execute even on SMP machines. In order to deal with BIOS |
976 | * bugs we support real mode APM BIOS power off calls. We also make |
977 | * the SMP call on CPU0 as some systems will only honour this call |
978 | * on their first cpu. |
979 | */ |
980 | |
981 | static void apm_power_off(void) |
982 | { |
983 | /* Some bioses don't like being called from CPU != 0 */ |
984 | if (apm_info.realmode_power_off) { |
985 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
986 | machine_real_restart(MRR_APM); |
987 | } else { |
988 | (void)set_system_power_state(APM_STATE_OFF); |
989 | } |
990 | } |
991 | |
992 | #ifdef CONFIG_APM_DO_ENABLE |
993 | |
994 | /** |
995 | * apm_enable_power_management - enable BIOS APM power management |
996 | * @enable: enable yes/no |
997 | * |
998 | * Enable or disable the APM BIOS power services. |
999 | */ |
1000 | |
1001 | static int apm_enable_power_management(int enable) |
1002 | { |
1003 | u32 eax; |
1004 | int err; |
1005 | |
1006 | if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED)) |
1007 | return APM_NOT_ENGAGED; |
1008 | if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL, |
1009 | enable, &eax, &err)) |
1010 | return err; |
1011 | if (enable) |
1012 | apm_info.bios.flags &= ~APM_BIOS_DISABLED; |
1013 | else |
1014 | apm_info.bios.flags |= APM_BIOS_DISABLED; |
1015 | return APM_SUCCESS; |
1016 | } |
1017 | #endif |
1018 | |
1019 | /** |
1020 | * apm_get_power_status - get current power state |
1021 | * @status: returned status |
1022 | * @bat: battery info |
1023 | * @life: estimated life |
1024 | * |
1025 | * Obtain the current power status from the APM BIOS. We return a |
1026 | * status which gives the rough battery status, and current power |
1027 | * source. The bat value returned give an estimate as a percentage |
1028 | * of life and a status value for the battery. The estimated life |
1029 | * if reported is a lifetime in seconds/minutes at current power |
1030 | * consumption. |
1031 | */ |
1032 | |
1033 | static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) |
1034 | { |
1035 | struct apm_bios_call call; |
1036 | |
1037 | call.func = APM_FUNC_GET_STATUS; |
1038 | call.ebx = APM_DEVICE_ALL; |
1039 | call.ecx = 0; |
1040 | |
1041 | if (apm_info.get_power_status_broken) |
1042 | return APM_32_UNSUPPORTED; |
1043 | if (apm_bios_call(call: &call)) { |
1044 | if (!call.err) |
1045 | return APM_NO_ERROR; |
1046 | return call.err; |
1047 | } |
1048 | *status = call.ebx; |
1049 | *bat = call.ecx; |
1050 | if (apm_info.get_power_status_swabinminutes) { |
1051 | *life = swab16((u16)call.edx); |
1052 | *life |= 0x8000; |
1053 | } else |
1054 | *life = call.edx; |
1055 | return APM_SUCCESS; |
1056 | } |
1057 | |
1058 | /** |
1059 | * apm_engage_power_management - enable PM on a device |
1060 | * @device: identity of device |
1061 | * @enable: on/off |
1062 | * |
1063 | * Activate or deactivate power management on either a specific device |
1064 | * or the entire system (%APM_DEVICE_ALL). |
1065 | */ |
1066 | |
1067 | static int apm_engage_power_management(u_short device, int enable) |
1068 | { |
1069 | u32 eax; |
1070 | int err; |
1071 | |
1072 | if ((enable == 0) && (device == APM_DEVICE_ALL) |
1073 | && (apm_info.bios.flags & APM_BIOS_DISABLED)) |
1074 | return APM_DISABLED; |
1075 | if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, ebx_in: device, ecx_in: enable, |
1076 | eax: &eax, err: &err)) |
1077 | return err; |
1078 | if (device == APM_DEVICE_ALL) { |
1079 | if (enable) |
1080 | apm_info.bios.flags &= ~APM_BIOS_DISENGAGED; |
1081 | else |
1082 | apm_info.bios.flags |= APM_BIOS_DISENGAGED; |
1083 | } |
1084 | return APM_SUCCESS; |
1085 | } |
1086 | |
1087 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
1088 | |
1089 | /** |
1090 | * apm_console_blank - blank the display |
1091 | * @blank: on/off |
1092 | * |
1093 | * Attempt to blank the console, firstly by blanking just video device |
1094 | * zero, and if that fails (some BIOSes don't support it) then it blanks |
1095 | * all video devices. Typically the BIOS will do laptop backlight and |
1096 | * monitor powerdown for us. |
1097 | */ |
1098 | |
1099 | static int apm_console_blank(int blank) |
1100 | { |
1101 | int error = APM_NOT_ENGAGED; /* silence gcc */ |
1102 | int i; |
1103 | u_short state; |
1104 | static const u_short dev[3] = { 0x100, 0x1FF, 0x101 }; |
1105 | |
1106 | state = blank ? APM_STATE_STANDBY : APM_STATE_READY; |
1107 | |
1108 | for (i = 0; i < ARRAY_SIZE(dev); i++) { |
1109 | error = set_power_state(dev[i], state); |
1110 | |
1111 | if ((error == APM_SUCCESS) || (error == APM_NO_ERROR)) |
1112 | return 1; |
1113 | |
1114 | if (error == APM_NOT_ENGAGED) |
1115 | break; |
1116 | } |
1117 | |
1118 | if (error == APM_NOT_ENGAGED) { |
1119 | static int tried; |
1120 | int eng_error; |
1121 | if (tried++ == 0) { |
1122 | eng_error = apm_engage_power_management(APM_DEVICE_ALL, 1); |
1123 | if (eng_error) { |
1124 | apm_error("set display" , error); |
1125 | apm_error("engage interface" , eng_error); |
1126 | return 0; |
1127 | } else |
1128 | return apm_console_blank(blank); |
1129 | } |
1130 | } |
1131 | apm_error("set display" , error); |
1132 | return 0; |
1133 | } |
1134 | #endif |
1135 | |
1136 | static int queue_empty(struct apm_user *as) |
1137 | { |
1138 | return as->event_head == as->event_tail; |
1139 | } |
1140 | |
1141 | static apm_event_t get_queued_event(struct apm_user *as) |
1142 | { |
1143 | if (++as->event_tail >= APM_MAX_EVENTS) |
1144 | as->event_tail = 0; |
1145 | return as->events[as->event_tail]; |
1146 | } |
1147 | |
1148 | static void queue_event(apm_event_t event, struct apm_user *sender) |
1149 | { |
1150 | struct apm_user *as; |
1151 | |
1152 | spin_lock(lock: &user_list_lock); |
1153 | if (user_list == NULL) |
1154 | goto out; |
1155 | for (as = user_list; as != NULL; as = as->next) { |
1156 | if ((as == sender) || (!as->reader)) |
1157 | continue; |
1158 | if (++as->event_head >= APM_MAX_EVENTS) |
1159 | as->event_head = 0; |
1160 | |
1161 | if (as->event_head == as->event_tail) { |
1162 | static int notified; |
1163 | |
1164 | if (notified++ == 0) |
1165 | pr_err("an event queue overflowed\n" ); |
1166 | if (++as->event_tail >= APM_MAX_EVENTS) |
1167 | as->event_tail = 0; |
1168 | } |
1169 | as->events[as->event_head] = event; |
1170 | if (!as->suser || !as->writer) |
1171 | continue; |
1172 | switch (event) { |
1173 | case APM_SYS_SUSPEND: |
1174 | case APM_USER_SUSPEND: |
1175 | as->suspends_pending++; |
1176 | suspends_pending++; |
1177 | break; |
1178 | |
1179 | case APM_SYS_STANDBY: |
1180 | case APM_USER_STANDBY: |
1181 | as->standbys_pending++; |
1182 | standbys_pending++; |
1183 | break; |
1184 | } |
1185 | } |
1186 | wake_up_interruptible(&apm_waitqueue); |
1187 | out: |
1188 | spin_unlock(lock: &user_list_lock); |
1189 | } |
1190 | |
1191 | static void reinit_timer(void) |
1192 | { |
1193 | #ifdef INIT_TIMER_AFTER_SUSPEND |
1194 | unsigned long flags; |
1195 | |
1196 | raw_spin_lock_irqsave(&i8253_lock, flags); |
1197 | /* set the clock to HZ */ |
1198 | outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ |
1199 | udelay(10); |
1200 | outb_p(LATCH & 0xff, PIT_CH0); /* LSB */ |
1201 | udelay(10); |
1202 | outb_p(LATCH >> 8, PIT_CH0); /* MSB */ |
1203 | udelay(10); |
1204 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1205 | #endif |
1206 | } |
1207 | |
1208 | static int suspend(int vetoable) |
1209 | { |
1210 | int err; |
1211 | struct apm_user *as; |
1212 | |
1213 | dpm_suspend_start(PMSG_SUSPEND); |
1214 | dpm_suspend_end(PMSG_SUSPEND); |
1215 | |
1216 | local_irq_disable(); |
1217 | syscore_suspend(); |
1218 | |
1219 | local_irq_enable(); |
1220 | |
1221 | save_processor_state(); |
1222 | err = set_system_power_state(APM_STATE_SUSPEND); |
1223 | ignore_normal_resume = 1; |
1224 | restore_processor_state(); |
1225 | |
1226 | local_irq_disable(); |
1227 | reinit_timer(); |
1228 | |
1229 | if (err == APM_NO_ERROR) |
1230 | err = APM_SUCCESS; |
1231 | if (err != APM_SUCCESS) |
1232 | apm_error(str: "suspend" , err); |
1233 | err = (err == APM_SUCCESS) ? 0 : -EIO; |
1234 | |
1235 | syscore_resume(); |
1236 | local_irq_enable(); |
1237 | |
1238 | dpm_resume_start(PMSG_RESUME); |
1239 | dpm_resume_end(PMSG_RESUME); |
1240 | |
1241 | queue_event(APM_NORMAL_RESUME, NULL); |
1242 | spin_lock(lock: &user_list_lock); |
1243 | for (as = user_list; as != NULL; as = as->next) { |
1244 | as->suspend_wait = 0; |
1245 | as->suspend_result = err; |
1246 | } |
1247 | spin_unlock(lock: &user_list_lock); |
1248 | wake_up_interruptible(&apm_suspend_waitqueue); |
1249 | return err; |
1250 | } |
1251 | |
1252 | static void standby(void) |
1253 | { |
1254 | int err; |
1255 | |
1256 | dpm_suspend_end(PMSG_SUSPEND); |
1257 | |
1258 | local_irq_disable(); |
1259 | syscore_suspend(); |
1260 | local_irq_enable(); |
1261 | |
1262 | err = set_system_power_state(APM_STATE_STANDBY); |
1263 | if ((err != APM_SUCCESS) && (err != APM_NO_ERROR)) |
1264 | apm_error(str: "standby" , err); |
1265 | |
1266 | local_irq_disable(); |
1267 | syscore_resume(); |
1268 | local_irq_enable(); |
1269 | |
1270 | dpm_resume_start(PMSG_RESUME); |
1271 | } |
1272 | |
1273 | static apm_event_t get_event(void) |
1274 | { |
1275 | int error; |
1276 | apm_event_t event = APM_NO_EVENTS; /* silence gcc */ |
1277 | apm_eventinfo_t info; |
1278 | |
1279 | static int notified; |
1280 | |
1281 | /* we don't use the eventinfo */ |
1282 | error = apm_get_event(event: &event, info: &info); |
1283 | if (error == APM_SUCCESS) |
1284 | return event; |
1285 | |
1286 | if ((error != APM_NO_EVENTS) && (notified++ == 0)) |
1287 | apm_error(str: "get_event" , err: error); |
1288 | |
1289 | return 0; |
1290 | } |
1291 | |
1292 | static void check_events(void) |
1293 | { |
1294 | apm_event_t event; |
1295 | static unsigned long last_resume; |
1296 | static int ignore_bounce; |
1297 | |
1298 | while ((event = get_event()) != 0) { |
1299 | if (debug) { |
1300 | if (event <= NR_APM_EVENT_NAME) |
1301 | printk(KERN_DEBUG "apm: received %s notify\n" , |
1302 | apm_event_name[event - 1]); |
1303 | else |
1304 | printk(KERN_DEBUG "apm: received unknown " |
1305 | "event 0x%02x\n" , event); |
1306 | } |
1307 | if (ignore_bounce |
1308 | && (time_after(jiffies, last_resume + bounce_interval))) |
1309 | ignore_bounce = 0; |
1310 | |
1311 | switch (event) { |
1312 | case APM_SYS_STANDBY: |
1313 | case APM_USER_STANDBY: |
1314 | queue_event(event, NULL); |
1315 | if (standbys_pending <= 0) |
1316 | standby(); |
1317 | break; |
1318 | |
1319 | case APM_USER_SUSPEND: |
1320 | #ifdef CONFIG_APM_IGNORE_USER_SUSPEND |
1321 | if (apm_info.connection_version > 0x100) |
1322 | set_system_power_state(APM_STATE_REJECT); |
1323 | break; |
1324 | #endif |
1325 | case APM_SYS_SUSPEND: |
1326 | if (ignore_bounce) { |
1327 | if (apm_info.connection_version > 0x100) |
1328 | set_system_power_state(APM_STATE_REJECT); |
1329 | break; |
1330 | } |
1331 | /* |
1332 | * If we are already processing a SUSPEND, |
1333 | * then further SUSPEND events from the BIOS |
1334 | * will be ignored. We also return here to |
1335 | * cope with the fact that the Thinkpads keep |
1336 | * sending a SUSPEND event until something else |
1337 | * happens! |
1338 | */ |
1339 | if (ignore_sys_suspend) |
1340 | return; |
1341 | ignore_sys_suspend = 1; |
1342 | queue_event(event, NULL); |
1343 | if (suspends_pending <= 0) |
1344 | (void) suspend(vetoable: 1); |
1345 | break; |
1346 | |
1347 | case APM_NORMAL_RESUME: |
1348 | case APM_CRITICAL_RESUME: |
1349 | case APM_STANDBY_RESUME: |
1350 | ignore_sys_suspend = 0; |
1351 | last_resume = jiffies; |
1352 | ignore_bounce = 1; |
1353 | if ((event != APM_NORMAL_RESUME) |
1354 | || (ignore_normal_resume == 0)) { |
1355 | dpm_resume_end(PMSG_RESUME); |
1356 | queue_event(event, NULL); |
1357 | } |
1358 | ignore_normal_resume = 0; |
1359 | break; |
1360 | |
1361 | case APM_CAPABILITY_CHANGE: |
1362 | case APM_LOW_BATTERY: |
1363 | case APM_POWER_STATUS_CHANGE: |
1364 | queue_event(event, NULL); |
1365 | /* If needed, notify drivers here */ |
1366 | break; |
1367 | |
1368 | case APM_UPDATE_TIME: |
1369 | break; |
1370 | |
1371 | case APM_CRITICAL_SUSPEND: |
1372 | /* |
1373 | * We are not allowed to reject a critical suspend. |
1374 | */ |
1375 | (void)suspend(vetoable: 0); |
1376 | break; |
1377 | } |
1378 | } |
1379 | } |
1380 | |
1381 | static void apm_event_handler(void) |
1382 | { |
1383 | static int pending_count = 4; |
1384 | int err; |
1385 | |
1386 | if ((standbys_pending > 0) || (suspends_pending > 0)) { |
1387 | if ((apm_info.connection_version > 0x100) && |
1388 | (pending_count-- <= 0)) { |
1389 | pending_count = 4; |
1390 | if (debug) |
1391 | printk(KERN_DEBUG "apm: setting state busy\n" ); |
1392 | err = set_system_power_state(APM_STATE_BUSY); |
1393 | if (err) |
1394 | apm_error(str: "busy" , err); |
1395 | } |
1396 | } else |
1397 | pending_count = 4; |
1398 | check_events(); |
1399 | } |
1400 | |
1401 | /* |
1402 | * This is the APM thread main loop. |
1403 | */ |
1404 | |
1405 | static void apm_mainloop(void) |
1406 | { |
1407 | DECLARE_WAITQUEUE(wait, current); |
1408 | |
1409 | add_wait_queue(wq_head: &apm_waitqueue, wq_entry: &wait); |
1410 | set_current_state(TASK_INTERRUPTIBLE); |
1411 | for (;;) { |
1412 | schedule_timeout(APM_CHECK_TIMEOUT); |
1413 | if (kthread_should_stop()) |
1414 | break; |
1415 | /* |
1416 | * Ok, check all events, check for idle (and mark us sleeping |
1417 | * so as not to count towards the load average).. |
1418 | */ |
1419 | set_current_state(TASK_INTERRUPTIBLE); |
1420 | apm_event_handler(); |
1421 | } |
1422 | remove_wait_queue(wq_head: &apm_waitqueue, wq_entry: &wait); |
1423 | } |
1424 | |
1425 | static int check_apm_user(struct apm_user *as, const char *func) |
1426 | { |
1427 | if (as == NULL || as->magic != APM_BIOS_MAGIC) { |
1428 | pr_err("%s passed bad filp\n" , func); |
1429 | return 1; |
1430 | } |
1431 | return 0; |
1432 | } |
1433 | |
1434 | static ssize_t do_read(struct file *fp, char __user *buf, size_t count, loff_t *ppos) |
1435 | { |
1436 | struct apm_user *as; |
1437 | int i; |
1438 | apm_event_t event; |
1439 | |
1440 | as = fp->private_data; |
1441 | if (check_apm_user(as, func: "read" )) |
1442 | return -EIO; |
1443 | if ((int)count < sizeof(apm_event_t)) |
1444 | return -EINVAL; |
1445 | if ((queue_empty(as)) && (fp->f_flags & O_NONBLOCK)) |
1446 | return -EAGAIN; |
1447 | wait_event_interruptible(apm_waitqueue, !queue_empty(as)); |
1448 | i = count; |
1449 | while ((i >= sizeof(event)) && !queue_empty(as)) { |
1450 | event = get_queued_event(as); |
1451 | if (copy_to_user(to: buf, from: &event, n: sizeof(event))) { |
1452 | if (i < count) |
1453 | break; |
1454 | return -EFAULT; |
1455 | } |
1456 | switch (event) { |
1457 | case APM_SYS_SUSPEND: |
1458 | case APM_USER_SUSPEND: |
1459 | as->suspends_read++; |
1460 | break; |
1461 | |
1462 | case APM_SYS_STANDBY: |
1463 | case APM_USER_STANDBY: |
1464 | as->standbys_read++; |
1465 | break; |
1466 | } |
1467 | buf += sizeof(event); |
1468 | i -= sizeof(event); |
1469 | } |
1470 | if (i < count) |
1471 | return count - i; |
1472 | if (signal_pending(current)) |
1473 | return -ERESTARTSYS; |
1474 | return 0; |
1475 | } |
1476 | |
1477 | static __poll_t do_poll(struct file *fp, poll_table *wait) |
1478 | { |
1479 | struct apm_user *as; |
1480 | |
1481 | as = fp->private_data; |
1482 | if (check_apm_user(as, func: "poll" )) |
1483 | return 0; |
1484 | poll_wait(filp: fp, wait_address: &apm_waitqueue, p: wait); |
1485 | if (!queue_empty(as)) |
1486 | return EPOLLIN | EPOLLRDNORM; |
1487 | return 0; |
1488 | } |
1489 | |
1490 | static long do_ioctl(struct file *filp, u_int cmd, u_long arg) |
1491 | { |
1492 | struct apm_user *as; |
1493 | int ret; |
1494 | |
1495 | as = filp->private_data; |
1496 | if (check_apm_user(as, func: "ioctl" )) |
1497 | return -EIO; |
1498 | if (!as->suser || !as->writer) |
1499 | return -EPERM; |
1500 | switch (cmd) { |
1501 | case APM_IOC_STANDBY: |
1502 | mutex_lock(&apm_mutex); |
1503 | if (as->standbys_read > 0) { |
1504 | as->standbys_read--; |
1505 | as->standbys_pending--; |
1506 | standbys_pending--; |
1507 | } else |
1508 | queue_event(APM_USER_STANDBY, sender: as); |
1509 | if (standbys_pending <= 0) |
1510 | standby(); |
1511 | mutex_unlock(lock: &apm_mutex); |
1512 | break; |
1513 | case APM_IOC_SUSPEND: |
1514 | mutex_lock(&apm_mutex); |
1515 | if (as->suspends_read > 0) { |
1516 | as->suspends_read--; |
1517 | as->suspends_pending--; |
1518 | suspends_pending--; |
1519 | } else |
1520 | queue_event(APM_USER_SUSPEND, sender: as); |
1521 | if (suspends_pending <= 0) { |
1522 | ret = suspend(vetoable: 1); |
1523 | mutex_unlock(lock: &apm_mutex); |
1524 | } else { |
1525 | as->suspend_wait = 1; |
1526 | mutex_unlock(lock: &apm_mutex); |
1527 | wait_event_interruptible(apm_suspend_waitqueue, |
1528 | as->suspend_wait == 0); |
1529 | ret = as->suspend_result; |
1530 | } |
1531 | return ret; |
1532 | default: |
1533 | return -ENOTTY; |
1534 | } |
1535 | return 0; |
1536 | } |
1537 | |
1538 | static int do_release(struct inode *inode, struct file *filp) |
1539 | { |
1540 | struct apm_user *as; |
1541 | |
1542 | as = filp->private_data; |
1543 | if (check_apm_user(as, func: "release" )) |
1544 | return 0; |
1545 | filp->private_data = NULL; |
1546 | if (as->standbys_pending > 0) { |
1547 | standbys_pending -= as->standbys_pending; |
1548 | if (standbys_pending <= 0) |
1549 | standby(); |
1550 | } |
1551 | if (as->suspends_pending > 0) { |
1552 | suspends_pending -= as->suspends_pending; |
1553 | if (suspends_pending <= 0) |
1554 | (void) suspend(vetoable: 1); |
1555 | } |
1556 | spin_lock(lock: &user_list_lock); |
1557 | if (user_list == as) |
1558 | user_list = as->next; |
1559 | else { |
1560 | struct apm_user *as1; |
1561 | |
1562 | for (as1 = user_list; |
1563 | (as1 != NULL) && (as1->next != as); |
1564 | as1 = as1->next) |
1565 | ; |
1566 | if (as1 == NULL) |
1567 | pr_err("filp not in user list\n" ); |
1568 | else |
1569 | as1->next = as->next; |
1570 | } |
1571 | spin_unlock(lock: &user_list_lock); |
1572 | kfree(objp: as); |
1573 | return 0; |
1574 | } |
1575 | |
1576 | static int do_open(struct inode *inode, struct file *filp) |
1577 | { |
1578 | struct apm_user *as; |
1579 | |
1580 | as = kmalloc(size: sizeof(*as), GFP_KERNEL); |
1581 | if (as == NULL) |
1582 | return -ENOMEM; |
1583 | |
1584 | as->magic = APM_BIOS_MAGIC; |
1585 | as->event_tail = as->event_head = 0; |
1586 | as->suspends_pending = as->standbys_pending = 0; |
1587 | as->suspends_read = as->standbys_read = 0; |
1588 | /* |
1589 | * XXX - this is a tiny bit broken, when we consider BSD |
1590 | * process accounting. If the device is opened by root, we |
1591 | * instantly flag that we used superuser privs. Who knows, |
1592 | * we might close the device immediately without doing a |
1593 | * privileged operation -- cevans |
1594 | */ |
1595 | as->suser = capable(CAP_SYS_ADMIN); |
1596 | as->writer = (filp->f_mode & FMODE_WRITE) == FMODE_WRITE; |
1597 | as->reader = (filp->f_mode & FMODE_READ) == FMODE_READ; |
1598 | spin_lock(lock: &user_list_lock); |
1599 | as->next = user_list; |
1600 | user_list = as; |
1601 | spin_unlock(lock: &user_list_lock); |
1602 | filp->private_data = as; |
1603 | return 0; |
1604 | } |
1605 | |
1606 | #ifdef CONFIG_PROC_FS |
1607 | static int proc_apm_show(struct seq_file *m, void *v) |
1608 | { |
1609 | unsigned short bx; |
1610 | unsigned short cx; |
1611 | unsigned short dx; |
1612 | int error; |
1613 | unsigned short ac_line_status = 0xff; |
1614 | unsigned short battery_status = 0xff; |
1615 | unsigned short battery_flag = 0xff; |
1616 | int percentage = -1; |
1617 | int time_units = -1; |
1618 | char *units = "?" ; |
1619 | |
1620 | if ((num_online_cpus() == 1) && |
1621 | !(error = apm_get_power_status(status: &bx, bat: &cx, life: &dx))) { |
1622 | ac_line_status = (bx >> 8) & 0xff; |
1623 | battery_status = bx & 0xff; |
1624 | if ((cx & 0xff) != 0xff) |
1625 | percentage = cx & 0xff; |
1626 | |
1627 | if (apm_info.connection_version > 0x100) { |
1628 | battery_flag = (cx >> 8) & 0xff; |
1629 | if (dx != 0xffff) { |
1630 | units = (dx & 0x8000) ? "min" : "sec" ; |
1631 | time_units = dx & 0x7fff; |
1632 | } |
1633 | } |
1634 | } |
1635 | /* Arguments, with symbols from linux/apm_bios.h. Information is |
1636 | from the Get Power Status (0x0a) call unless otherwise noted. |
1637 | |
1638 | 0) Linux driver version (this will change if format changes) |
1639 | 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. |
1640 | 2) APM flags from APM Installation Check (0x00): |
1641 | bit 0: APM_16_BIT_SUPPORT |
1642 | bit 1: APM_32_BIT_SUPPORT |
1643 | bit 2: APM_IDLE_SLOWS_CLOCK |
1644 | bit 3: APM_BIOS_DISABLED |
1645 | bit 4: APM_BIOS_DISENGAGED |
1646 | 3) AC line status |
1647 | 0x00: Off-line |
1648 | 0x01: On-line |
1649 | 0x02: On backup power (BIOS >= 1.1 only) |
1650 | 0xff: Unknown |
1651 | 4) Battery status |
1652 | 0x00: High |
1653 | 0x01: Low |
1654 | 0x02: Critical |
1655 | 0x03: Charging |
1656 | 0x04: Selected battery not present (BIOS >= 1.2 only) |
1657 | 0xff: Unknown |
1658 | 5) Battery flag |
1659 | bit 0: High |
1660 | bit 1: Low |
1661 | bit 2: Critical |
1662 | bit 3: Charging |
1663 | bit 7: No system battery |
1664 | 0xff: Unknown |
1665 | 6) Remaining battery life (percentage of charge): |
1666 | 0-100: valid |
1667 | -1: Unknown |
1668 | 7) Remaining battery life (time units): |
1669 | Number of remaining minutes or seconds |
1670 | -1: Unknown |
1671 | 8) min = minutes; sec = seconds */ |
1672 | |
1673 | seq_printf(m, fmt: "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n" , |
1674 | driver_version, |
1675 | (apm_info.bios.version >> 8) & 0xff, |
1676 | apm_info.bios.version & 0xff, |
1677 | apm_info.bios.flags, |
1678 | ac_line_status, |
1679 | battery_status, |
1680 | battery_flag, |
1681 | percentage, |
1682 | time_units, |
1683 | units); |
1684 | return 0; |
1685 | } |
1686 | #endif |
1687 | |
1688 | static int apm(void *unused) |
1689 | { |
1690 | unsigned short bx; |
1691 | unsigned short cx; |
1692 | unsigned short dx; |
1693 | int error; |
1694 | char *power_stat; |
1695 | char *bat_stat; |
1696 | |
1697 | /* 2002/08/01 - WT |
1698 | * This is to avoid random crashes at boot time during initialization |
1699 | * on SMP systems in case of "apm=power-off" mode. Seen on ASUS A7M266D. |
1700 | * Some bioses don't like being called from CPU != 0. |
1701 | * Method suggested by Ingo Molnar. |
1702 | */ |
1703 | set_cpus_allowed_ptr(current, cpumask_of(0)); |
1704 | BUG_ON(smp_processor_id() != 0); |
1705 | |
1706 | if (apm_info.connection_version == 0) { |
1707 | apm_info.connection_version = apm_info.bios.version; |
1708 | if (apm_info.connection_version > 0x100) { |
1709 | /* |
1710 | * We only support BIOSs up to version 1.2 |
1711 | */ |
1712 | if (apm_info.connection_version > 0x0102) |
1713 | apm_info.connection_version = 0x0102; |
1714 | error = apm_driver_version(val: &apm_info.connection_version); |
1715 | if (error != APM_SUCCESS) { |
1716 | apm_error(str: "driver version" , err: error); |
1717 | /* Fall back to an APM 1.0 connection. */ |
1718 | apm_info.connection_version = 0x100; |
1719 | } |
1720 | } |
1721 | } |
1722 | |
1723 | if (debug) |
1724 | printk(KERN_INFO "apm: Connection version %d.%d\n" , |
1725 | (apm_info.connection_version >> 8) & 0xff, |
1726 | apm_info.connection_version & 0xff); |
1727 | |
1728 | #ifdef CONFIG_APM_DO_ENABLE |
1729 | if (apm_info.bios.flags & APM_BIOS_DISABLED) { |
1730 | /* |
1731 | * This call causes my NEC UltraLite Versa 33/C to hang if it |
1732 | * is booted with PM disabled but not in the docking station. |
1733 | * Unfortunate ... |
1734 | */ |
1735 | error = apm_enable_power_management(1); |
1736 | if (error) { |
1737 | apm_error("enable power management" , error); |
1738 | return -1; |
1739 | } |
1740 | } |
1741 | #endif |
1742 | |
1743 | if ((apm_info.bios.flags & APM_BIOS_DISENGAGED) |
1744 | && (apm_info.connection_version > 0x0100)) { |
1745 | error = apm_engage_power_management(APM_DEVICE_ALL, enable: 1); |
1746 | if (error) { |
1747 | apm_error(str: "engage power management" , err: error); |
1748 | return -1; |
1749 | } |
1750 | } |
1751 | |
1752 | if (debug && (num_online_cpus() == 1 || smp)) { |
1753 | error = apm_get_power_status(status: &bx, bat: &cx, life: &dx); |
1754 | if (error) |
1755 | printk(KERN_INFO "apm: power status not available\n" ); |
1756 | else { |
1757 | switch ((bx >> 8) & 0xff) { |
1758 | case 0: |
1759 | power_stat = "off line" ; |
1760 | break; |
1761 | case 1: |
1762 | power_stat = "on line" ; |
1763 | break; |
1764 | case 2: |
1765 | power_stat = "on backup power" ; |
1766 | break; |
1767 | default: |
1768 | power_stat = "unknown" ; |
1769 | break; |
1770 | } |
1771 | switch (bx & 0xff) { |
1772 | case 0: |
1773 | bat_stat = "high" ; |
1774 | break; |
1775 | case 1: |
1776 | bat_stat = "low" ; |
1777 | break; |
1778 | case 2: |
1779 | bat_stat = "critical" ; |
1780 | break; |
1781 | case 3: |
1782 | bat_stat = "charging" ; |
1783 | break; |
1784 | default: |
1785 | bat_stat = "unknown" ; |
1786 | break; |
1787 | } |
1788 | printk(KERN_INFO |
1789 | "apm: AC %s, battery status %s, battery life " , |
1790 | power_stat, bat_stat); |
1791 | if ((cx & 0xff) == 0xff) |
1792 | printk("unknown\n" ); |
1793 | else |
1794 | printk("%d%%\n" , cx & 0xff); |
1795 | if (apm_info.connection_version > 0x100) { |
1796 | printk(KERN_INFO |
1797 | "apm: battery flag 0x%02x, battery life " , |
1798 | (cx >> 8) & 0xff); |
1799 | if (dx == 0xffff) |
1800 | printk("unknown\n" ); |
1801 | else |
1802 | printk("%d %s\n" , dx & 0x7fff, |
1803 | (dx & 0x8000) ? |
1804 | "minutes" : "seconds" ); |
1805 | } |
1806 | } |
1807 | } |
1808 | |
1809 | /* Install our power off handler.. */ |
1810 | if (power_off) |
1811 | pm_power_off = apm_power_off; |
1812 | |
1813 | if (num_online_cpus() == 1 || smp) { |
1814 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
1815 | console_blank_hook = apm_console_blank; |
1816 | #endif |
1817 | apm_mainloop(); |
1818 | #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) |
1819 | console_blank_hook = NULL; |
1820 | #endif |
1821 | } |
1822 | |
1823 | return 0; |
1824 | } |
1825 | |
1826 | #ifndef MODULE |
1827 | static int __init apm_setup(char *str) |
1828 | { |
1829 | int invert; |
1830 | |
1831 | while ((str != NULL) && (*str != '\0')) { |
1832 | if (strncmp(str, "off" , 3) == 0) |
1833 | apm_disabled = 1; |
1834 | if (strncmp(str, "on" , 2) == 0) |
1835 | apm_disabled = 0; |
1836 | if ((strncmp(str, "bounce-interval=" , 16) == 0) || |
1837 | (strncmp(str, "bounce_interval=" , 16) == 0)) |
1838 | bounce_interval = simple_strtol(str + 16, NULL, 0); |
1839 | if ((strncmp(str, "idle-threshold=" , 15) == 0) || |
1840 | (strncmp(str, "idle_threshold=" , 15) == 0)) |
1841 | idle_threshold = simple_strtol(str + 15, NULL, 0); |
1842 | if ((strncmp(str, "idle-period=" , 12) == 0) || |
1843 | (strncmp(str, "idle_period=" , 12) == 0)) |
1844 | idle_period = simple_strtol(str + 12, NULL, 0); |
1845 | invert = (strncmp(str, "no-" , 3) == 0) || |
1846 | (strncmp(str, "no_" , 3) == 0); |
1847 | if (invert) |
1848 | str += 3; |
1849 | if (strncmp(str, "debug" , 5) == 0) |
1850 | debug = !invert; |
1851 | if ((strncmp(str, "power-off" , 9) == 0) || |
1852 | (strncmp(str, "power_off" , 9) == 0)) |
1853 | power_off = !invert; |
1854 | if (strncmp(str, "smp" , 3) == 0) { |
1855 | smp = !invert; |
1856 | idle_threshold = 100; |
1857 | } |
1858 | if ((strncmp(str, "allow-ints" , 10) == 0) || |
1859 | (strncmp(str, "allow_ints" , 10) == 0)) |
1860 | apm_info.allow_ints = !invert; |
1861 | if ((strncmp(str, "broken-psr" , 10) == 0) || |
1862 | (strncmp(str, "broken_psr" , 10) == 0)) |
1863 | apm_info.get_power_status_broken = !invert; |
1864 | if ((strncmp(str, "realmode-power-off" , 18) == 0) || |
1865 | (strncmp(str, "realmode_power_off" , 18) == 0)) |
1866 | apm_info.realmode_power_off = !invert; |
1867 | str = strchr(str, ','); |
1868 | if (str != NULL) |
1869 | str += strspn(str, ", \t" ); |
1870 | } |
1871 | return 1; |
1872 | } |
1873 | |
1874 | __setup("apm=" , apm_setup); |
1875 | #endif |
1876 | |
1877 | static const struct file_operations apm_bios_fops = { |
1878 | .owner = THIS_MODULE, |
1879 | .read = do_read, |
1880 | .poll = do_poll, |
1881 | .unlocked_ioctl = do_ioctl, |
1882 | .open = do_open, |
1883 | .release = do_release, |
1884 | .llseek = noop_llseek, |
1885 | }; |
1886 | |
1887 | static struct miscdevice apm_device = { |
1888 | APM_MINOR_DEV, |
1889 | "apm_bios" , |
1890 | &apm_bios_fops |
1891 | }; |
1892 | |
1893 | |
1894 | /* Simple "print if true" callback */ |
1895 | static int __init print_if_true(const struct dmi_system_id *d) |
1896 | { |
1897 | printk("%s\n" , d->ident); |
1898 | return 0; |
1899 | } |
1900 | |
1901 | /* |
1902 | * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it was |
1903 | * disabled before the suspend. Linux used to get terribly confused by that. |
1904 | */ |
1905 | static int __init broken_ps2_resume(const struct dmi_system_id *d) |
1906 | { |
1907 | printk(KERN_INFO "%s machine detected. Mousepad Resume Bug " |
1908 | "workaround hopefully not needed.\n" , d->ident); |
1909 | return 0; |
1910 | } |
1911 | |
1912 | /* Some bioses have a broken protected mode poweroff and need to use realmode */ |
1913 | static int __init set_realmode_power_off(const struct dmi_system_id *d) |
1914 | { |
1915 | if (apm_info.realmode_power_off == 0) { |
1916 | apm_info.realmode_power_off = 1; |
1917 | printk(KERN_INFO "%s bios detected. " |
1918 | "Using realmode poweroff only.\n" , d->ident); |
1919 | } |
1920 | return 0; |
1921 | } |
1922 | |
1923 | /* Some laptops require interrupts to be enabled during APM calls */ |
1924 | static int __init set_apm_ints(const struct dmi_system_id *d) |
1925 | { |
1926 | if (apm_info.allow_ints == 0) { |
1927 | apm_info.allow_ints = 1; |
1928 | printk(KERN_INFO "%s machine detected. " |
1929 | "Enabling interrupts during APM calls.\n" , d->ident); |
1930 | } |
1931 | return 0; |
1932 | } |
1933 | |
1934 | /* Some APM bioses corrupt memory or just plain do not work */ |
1935 | static int __init apm_is_horked(const struct dmi_system_id *d) |
1936 | { |
1937 | if (apm_info.disabled == 0) { |
1938 | apm_info.disabled = 1; |
1939 | printk(KERN_INFO "%s machine detected. " |
1940 | "Disabling APM.\n" , d->ident); |
1941 | } |
1942 | return 0; |
1943 | } |
1944 | |
1945 | static int __init apm_is_horked_d850md(const struct dmi_system_id *d) |
1946 | { |
1947 | if (apm_info.disabled == 0) { |
1948 | apm_info.disabled = 1; |
1949 | printk(KERN_INFO "%s machine detected. " |
1950 | "Disabling APM.\n" , d->ident); |
1951 | printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n" ); |
1952 | printk(KERN_INFO "download from support.intel.com\n" ); |
1953 | } |
1954 | return 0; |
1955 | } |
1956 | |
1957 | /* Some APM bioses hang on APM idle calls */ |
1958 | static int __init apm_likes_to_melt(const struct dmi_system_id *d) |
1959 | { |
1960 | if (apm_info.forbid_idle == 0) { |
1961 | apm_info.forbid_idle = 1; |
1962 | printk(KERN_INFO "%s machine detected. " |
1963 | "Disabling APM idle calls.\n" , d->ident); |
1964 | } |
1965 | return 0; |
1966 | } |
1967 | |
1968 | /* |
1969 | * Check for clue free BIOS implementations who use |
1970 | * the following QA technique |
1971 | * |
1972 | * [ Write BIOS Code ]<------ |
1973 | * | ^ |
1974 | * < Does it Compile >----N-- |
1975 | * |Y ^ |
1976 | * < Does it Boot Win98 >-N-- |
1977 | * |Y |
1978 | * [Ship It] |
1979 | * |
1980 | * Phoenix A04 08/24/2000 is known bad (Dell Inspiron 5000e) |
1981 | * Phoenix A07 09/29/2000 is known good (Dell Inspiron 5000) |
1982 | */ |
1983 | static int __init broken_apm_power(const struct dmi_system_id *d) |
1984 | { |
1985 | apm_info.get_power_status_broken = 1; |
1986 | printk(KERN_WARNING "BIOS strings suggest APM bugs, " |
1987 | "disabling power status reporting.\n" ); |
1988 | return 0; |
1989 | } |
1990 | |
1991 | /* |
1992 | * This bios swaps the APM minute reporting bytes over (Many sony laptops |
1993 | * have this problem). |
1994 | */ |
1995 | static int __init swab_apm_power_in_minutes(const struct dmi_system_id *d) |
1996 | { |
1997 | apm_info.get_power_status_swabinminutes = 1; |
1998 | printk(KERN_WARNING "BIOS strings suggest APM reports battery life " |
1999 | "in minutes and wrong byte order.\n" ); |
2000 | return 0; |
2001 | } |
2002 | |
2003 | static const struct dmi_system_id apm_dmi_table[] __initconst = { |
2004 | { |
2005 | print_if_true, |
2006 | KERN_WARNING "IBM T23 - BIOS 1.03b+ and controller firmware 1.02+ may be needed for Linux APM." , |
2007 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM" ), |
2008 | DMI_MATCH(DMI_BIOS_VERSION, "1AET38WW (1.01b)" ), }, |
2009 | }, |
2010 | { /* Handle problems with APM on the C600 */ |
2011 | broken_ps2_resume, "Dell Latitude C600" , |
2012 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell" ), |
2013 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C600" ), }, |
2014 | }, |
2015 | { /* Allow interrupts during suspend on Dell Latitude laptops*/ |
2016 | set_apm_ints, "Dell Latitude" , |
2017 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation" ), |
2018 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude C510" ), } |
2019 | }, |
2020 | { /* APM crashes */ |
2021 | apm_is_horked, "Dell Inspiron 2500" , |
2022 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation" ), |
2023 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500" ), |
2024 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2025 | DMI_MATCH(DMI_BIOS_VERSION, "A11" ), }, |
2026 | }, |
2027 | { /* Allow interrupts during suspend on Dell Inspiron laptops*/ |
2028 | set_apm_ints, "Dell Inspiron" , { |
2029 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation" ), |
2030 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 4000" ), }, |
2031 | }, |
2032 | { /* Handle problems with APM on Inspiron 5000e */ |
2033 | broken_apm_power, "Dell Inspiron 5000e" , |
2034 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2035 | DMI_MATCH(DMI_BIOS_VERSION, "A04" ), |
2036 | DMI_MATCH(DMI_BIOS_DATE, "08/24/2000" ), }, |
2037 | }, |
2038 | { /* Handle problems with APM on Inspiron 2500 */ |
2039 | broken_apm_power, "Dell Inspiron 2500" , |
2040 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2041 | DMI_MATCH(DMI_BIOS_VERSION, "A12" ), |
2042 | DMI_MATCH(DMI_BIOS_DATE, "02/04/2002" ), }, |
2043 | }, |
2044 | { /* APM crashes */ |
2045 | apm_is_horked, "Dell Dimension 4100" , |
2046 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation" ), |
2047 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z" ), |
2048 | DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp." ), |
2049 | DMI_MATCH(DMI_BIOS_VERSION, "A11" ), }, |
2050 | }, |
2051 | { /* Allow interrupts during suspend on Compaq Laptops*/ |
2052 | set_apm_ints, "Compaq 12XL125" , |
2053 | { DMI_MATCH(DMI_SYS_VENDOR, "Compaq" ), |
2054 | DMI_MATCH(DMI_PRODUCT_NAME, "Compaq PC" ), |
2055 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2056 | DMI_MATCH(DMI_BIOS_VERSION, "4.06" ), }, |
2057 | }, |
2058 | { /* Allow interrupts during APM or the clock goes slow */ |
2059 | set_apm_ints, "ASUSTeK" , |
2060 | { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc." ), |
2061 | DMI_MATCH(DMI_PRODUCT_NAME, "L8400K series Notebook PC" ), }, |
2062 | }, |
2063 | { /* APM blows on shutdown */ |
2064 | apm_is_horked, "ABIT KX7-333[R]" , |
2065 | { DMI_MATCH(DMI_BOARD_VENDOR, "ABIT" ), |
2066 | DMI_MATCH(DMI_BOARD_NAME, "VT8367-8233A (KX7-333[R])" ), }, |
2067 | }, |
2068 | { /* APM crashes */ |
2069 | apm_is_horked, "Trigem Delhi3" , |
2070 | { DMI_MATCH(DMI_SYS_VENDOR, "TriGem Computer, Inc" ), |
2071 | DMI_MATCH(DMI_PRODUCT_NAME, "Delhi3" ), }, |
2072 | }, |
2073 | { /* APM crashes */ |
2074 | apm_is_horked, "Fujitsu-Siemens" , |
2075 | { DMI_MATCH(DMI_BIOS_VENDOR, "hoenix/FUJITSU SIEMENS" ), |
2076 | DMI_MATCH(DMI_BIOS_VERSION, "Version1.01" ), }, |
2077 | }, |
2078 | { /* APM crashes */ |
2079 | apm_is_horked_d850md, "Intel D850MD" , |
2080 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp." ), |
2081 | DMI_MATCH(DMI_BIOS_VERSION, "MV85010A.86A.0016.P07.0201251536" ), }, |
2082 | }, |
2083 | { /* APM crashes */ |
2084 | apm_is_horked, "Intel D810EMO" , |
2085 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp." ), |
2086 | DMI_MATCH(DMI_BIOS_VERSION, "MO81010A.86A.0008.P04.0004170800" ), }, |
2087 | }, |
2088 | { /* APM crashes */ |
2089 | apm_is_horked, "Dell XPS-Z" , |
2090 | { DMI_MATCH(DMI_BIOS_VENDOR, "Intel Corp." ), |
2091 | DMI_MATCH(DMI_BIOS_VERSION, "A11" ), |
2092 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS-Z" ), }, |
2093 | }, |
2094 | { /* APM crashes */ |
2095 | apm_is_horked, "Sharp PC-PJ/AX" , |
2096 | { DMI_MATCH(DMI_SYS_VENDOR, "SHARP" ), |
2097 | DMI_MATCH(DMI_PRODUCT_NAME, "PC-PJ/AX" ), |
2098 | DMI_MATCH(DMI_BIOS_VENDOR, "SystemSoft" ), |
2099 | DMI_MATCH(DMI_BIOS_VERSION, "Version R2.08" ), }, |
2100 | }, |
2101 | { /* APM crashes */ |
2102 | apm_is_horked, "Dell Inspiron 2500" , |
2103 | { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation" ), |
2104 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 2500" ), |
2105 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2106 | DMI_MATCH(DMI_BIOS_VERSION, "A11" ), }, |
2107 | }, |
2108 | { /* APM idle hangs */ |
2109 | apm_likes_to_melt, "Jabil AMD" , |
2110 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc." ), |
2111 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06" ), }, |
2112 | }, |
2113 | { /* APM idle hangs */ |
2114 | apm_likes_to_melt, "AMI Bios" , |
2115 | { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc." ), |
2116 | DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05" ), }, |
2117 | }, |
2118 | { /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */ |
2119 | swab_apm_power_in_minutes, "Sony VAIO" , |
2120 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2121 | DMI_MATCH(DMI_BIOS_VERSION, "R0206H" ), |
2122 | DMI_MATCH(DMI_BIOS_DATE, "08/23/99" ), }, |
2123 | }, |
2124 | { /* Handle problems with APM on Sony Vaio PCG-N505VX */ |
2125 | swab_apm_power_in_minutes, "Sony VAIO" , |
2126 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2127 | DMI_MATCH(DMI_BIOS_VERSION, "W2K06H0" ), |
2128 | DMI_MATCH(DMI_BIOS_DATE, "02/03/00" ), }, |
2129 | }, |
2130 | { /* Handle problems with APM on Sony Vaio PCG-XG29 */ |
2131 | swab_apm_power_in_minutes, "Sony VAIO" , |
2132 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2133 | DMI_MATCH(DMI_BIOS_VERSION, "R0117A0" ), |
2134 | DMI_MATCH(DMI_BIOS_DATE, "04/25/00" ), }, |
2135 | }, |
2136 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ |
2137 | swab_apm_power_in_minutes, "Sony VAIO" , |
2138 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2139 | DMI_MATCH(DMI_BIOS_VERSION, "R0121Z1" ), |
2140 | DMI_MATCH(DMI_BIOS_DATE, "05/11/00" ), }, |
2141 | }, |
2142 | { /* Handle problems with APM on Sony Vaio PCG-Z600NE */ |
2143 | swab_apm_power_in_minutes, "Sony VAIO" , |
2144 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2145 | DMI_MATCH(DMI_BIOS_VERSION, "WME01Z1" ), |
2146 | DMI_MATCH(DMI_BIOS_DATE, "08/11/00" ), }, |
2147 | }, |
2148 | { /* Handle problems with APM on Sony Vaio PCG-Z600LEK(DE) */ |
2149 | swab_apm_power_in_minutes, "Sony VAIO" , |
2150 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2151 | DMI_MATCH(DMI_BIOS_VERSION, "R0206Z3" ), |
2152 | DMI_MATCH(DMI_BIOS_DATE, "12/25/00" ), }, |
2153 | }, |
2154 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ |
2155 | swab_apm_power_in_minutes, "Sony VAIO" , |
2156 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2157 | DMI_MATCH(DMI_BIOS_VERSION, "R0203D0" ), |
2158 | DMI_MATCH(DMI_BIOS_DATE, "05/12/00" ), }, |
2159 | }, |
2160 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS */ |
2161 | swab_apm_power_in_minutes, "Sony VAIO" , |
2162 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2163 | DMI_MATCH(DMI_BIOS_VERSION, "R0203Z3" ), |
2164 | DMI_MATCH(DMI_BIOS_DATE, "08/25/00" ), }, |
2165 | }, |
2166 | { /* Handle problems with APM on Sony Vaio PCG-Z505LS (with updated BIOS) */ |
2167 | swab_apm_power_in_minutes, "Sony VAIO" , |
2168 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2169 | DMI_MATCH(DMI_BIOS_VERSION, "R0209Z3" ), |
2170 | DMI_MATCH(DMI_BIOS_DATE, "05/12/01" ), }, |
2171 | }, |
2172 | { /* Handle problems with APM on Sony Vaio PCG-F104K */ |
2173 | swab_apm_power_in_minutes, "Sony VAIO" , |
2174 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2175 | DMI_MATCH(DMI_BIOS_VERSION, "R0204K2" ), |
2176 | DMI_MATCH(DMI_BIOS_DATE, "08/28/00" ), }, |
2177 | }, |
2178 | |
2179 | { /* Handle problems with APM on Sony Vaio PCG-C1VN/C1VE */ |
2180 | swab_apm_power_in_minutes, "Sony VAIO" , |
2181 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2182 | DMI_MATCH(DMI_BIOS_VERSION, "R0208P1" ), |
2183 | DMI_MATCH(DMI_BIOS_DATE, "11/09/00" ), }, |
2184 | }, |
2185 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ |
2186 | swab_apm_power_in_minutes, "Sony VAIO" , |
2187 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2188 | DMI_MATCH(DMI_BIOS_VERSION, "R0204P1" ), |
2189 | DMI_MATCH(DMI_BIOS_DATE, "09/12/00" ), }, |
2190 | }, |
2191 | { /* Handle problems with APM on Sony Vaio PCG-C1VE */ |
2192 | swab_apm_power_in_minutes, "Sony VAIO" , |
2193 | { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD" ), |
2194 | DMI_MATCH(DMI_BIOS_VERSION, "WXPO1Z3" ), |
2195 | DMI_MATCH(DMI_BIOS_DATE, "10/26/01" ), }, |
2196 | }, |
2197 | { /* broken PM poweroff bios */ |
2198 | set_realmode_power_off, "Award Software v4.60 PGMA" , |
2199 | { DMI_MATCH(DMI_BIOS_VENDOR, "Award Software International, Inc." ), |
2200 | DMI_MATCH(DMI_BIOS_VERSION, "4.60 PGMA" ), |
2201 | DMI_MATCH(DMI_BIOS_DATE, "134526184" ), }, |
2202 | }, |
2203 | |
2204 | /* Generic per vendor APM settings */ |
2205 | |
2206 | { /* Allow interrupts during suspend on IBM laptops */ |
2207 | set_apm_ints, "IBM" , |
2208 | { DMI_MATCH(DMI_SYS_VENDOR, "IBM" ), }, |
2209 | }, |
2210 | |
2211 | { } |
2212 | }; |
2213 | |
2214 | /* |
2215 | * Just start the APM thread. We do NOT want to do APM BIOS |
2216 | * calls from anything but the APM thread, if for no other reason |
2217 | * than the fact that we don't trust the APM BIOS. This way, |
2218 | * most common APM BIOS problems that lead to protection errors |
2219 | * etc will have at least some level of being contained... |
2220 | * |
2221 | * In short, if something bad happens, at least we have a choice |
2222 | * of just killing the apm thread.. |
2223 | */ |
2224 | static int __init apm_init(void) |
2225 | { |
2226 | struct desc_struct *gdt; |
2227 | int err; |
2228 | |
2229 | dmi_check_system(list: apm_dmi_table); |
2230 | |
2231 | if (apm_info.bios.version == 0 || machine_is_olpc()) { |
2232 | printk(KERN_INFO "apm: BIOS not found.\n" ); |
2233 | return -ENODEV; |
2234 | } |
2235 | printk(KERN_INFO |
2236 | "apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n" , |
2237 | ((apm_info.bios.version >> 8) & 0xff), |
2238 | (apm_info.bios.version & 0xff), |
2239 | apm_info.bios.flags, |
2240 | driver_version); |
2241 | if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) { |
2242 | printk(KERN_INFO "apm: no 32 bit BIOS support\n" ); |
2243 | return -ENODEV; |
2244 | } |
2245 | |
2246 | if (allow_ints) |
2247 | apm_info.allow_ints = 1; |
2248 | if (broken_psr) |
2249 | apm_info.get_power_status_broken = 1; |
2250 | if (realmode_power_off) |
2251 | apm_info.realmode_power_off = 1; |
2252 | /* User can override, but default is to trust DMI */ |
2253 | if (apm_disabled != -1) |
2254 | apm_info.disabled = apm_disabled; |
2255 | |
2256 | /* |
2257 | * Fix for the Compaq Contura 3/25c which reports BIOS version 0.1 |
2258 | * but is reportedly a 1.0 BIOS. |
2259 | */ |
2260 | if (apm_info.bios.version == 0x001) |
2261 | apm_info.bios.version = 0x100; |
2262 | |
2263 | /* BIOS < 1.2 doesn't set cseg_16_len */ |
2264 | if (apm_info.bios.version < 0x102) |
2265 | apm_info.bios.cseg_16_len = 0; /* 64k */ |
2266 | |
2267 | if (debug) { |
2268 | printk(KERN_INFO "apm: entry %x:%x cseg16 %x dseg %x" , |
2269 | apm_info.bios.cseg, apm_info.bios.offset, |
2270 | apm_info.bios.cseg_16, apm_info.bios.dseg); |
2271 | if (apm_info.bios.version > 0x100) |
2272 | printk(" cseg len %x, dseg len %x" , |
2273 | apm_info.bios.cseg_len, |
2274 | apm_info.bios.dseg_len); |
2275 | if (apm_info.bios.version > 0x101) |
2276 | printk(" cseg16 len %x" , apm_info.bios.cseg_16_len); |
2277 | printk("\n" ); |
2278 | } |
2279 | |
2280 | if (apm_info.disabled) { |
2281 | pr_notice("disabled on user request.\n" ); |
2282 | return -ENODEV; |
2283 | } |
2284 | if ((num_online_cpus() > 1) && !power_off && !smp) { |
2285 | pr_notice("disabled - APM is not SMP safe.\n" ); |
2286 | apm_info.disabled = 1; |
2287 | return -ENODEV; |
2288 | } |
2289 | if (!acpi_disabled) { |
2290 | pr_notice("overridden by ACPI.\n" ); |
2291 | apm_info.disabled = 1; |
2292 | return -ENODEV; |
2293 | } |
2294 | |
2295 | /* |
2296 | * Set up the long jump entry point to the APM BIOS, which is called |
2297 | * from inline assembly. |
2298 | */ |
2299 | apm_bios_entry.offset = apm_info.bios.offset; |
2300 | apm_bios_entry.segment = APM_CS; |
2301 | |
2302 | /* |
2303 | * The APM 1.1 BIOS is supposed to provide limit information that it |
2304 | * recognizes. Many machines do this correctly, but many others do |
2305 | * not restrict themselves to their claimed limit. When this happens, |
2306 | * they will cause a segmentation violation in the kernel at boot time. |
2307 | * Most BIOS's, however, will respect a 64k limit, so we use that. |
2308 | * |
2309 | * Note we only set APM segments on CPU zero, since we pin the APM |
2310 | * code to that CPU. |
2311 | */ |
2312 | gdt = get_cpu_gdt_rw(cpu: 0); |
2313 | set_desc_base(&gdt[APM_CS >> 3], |
2314 | (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4)); |
2315 | set_desc_base(&gdt[APM_CS_16 >> 3], |
2316 | (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4)); |
2317 | set_desc_base(&gdt[APM_DS >> 3], |
2318 | (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4)); |
2319 | |
2320 | proc_create_single("apm" , 0, NULL, proc_apm_show); |
2321 | |
2322 | kapmd_task = kthread_create(apm, NULL, "kapmd" ); |
2323 | if (IS_ERR(ptr: kapmd_task)) { |
2324 | pr_err("disabled - Unable to start kernel thread\n" ); |
2325 | err = PTR_ERR(ptr: kapmd_task); |
2326 | kapmd_task = NULL; |
2327 | remove_proc_entry("apm" , NULL); |
2328 | return err; |
2329 | } |
2330 | wake_up_process(tsk: kapmd_task); |
2331 | |
2332 | if (num_online_cpus() > 1 && !smp) { |
2333 | printk(KERN_NOTICE |
2334 | "apm: disabled - APM is not SMP safe (power off active).\n" ); |
2335 | return 0; |
2336 | } |
2337 | |
2338 | /* |
2339 | * Note we don't actually care if the misc_device cannot be registered. |
2340 | * this driver can do its job without it, even if userspace can't |
2341 | * control it. just log the error |
2342 | */ |
2343 | if (misc_register(misc: &apm_device)) |
2344 | printk(KERN_WARNING "apm: Could not register misc device.\n" ); |
2345 | |
2346 | if (HZ != 100) |
2347 | idle_period = (idle_period * HZ) / 100; |
2348 | if (idle_threshold < 100) { |
2349 | cpuidle_poll_state_init(drv: &apm_idle_driver); |
2350 | if (!cpuidle_register_driver(drv: &apm_idle_driver)) |
2351 | if (cpuidle_register_device(dev: &apm_cpuidle_device)) |
2352 | cpuidle_unregister_driver(drv: &apm_idle_driver); |
2353 | } |
2354 | |
2355 | return 0; |
2356 | } |
2357 | |
2358 | static void __exit apm_exit(void) |
2359 | { |
2360 | int error; |
2361 | |
2362 | cpuidle_unregister_device(dev: &apm_cpuidle_device); |
2363 | cpuidle_unregister_driver(drv: &apm_idle_driver); |
2364 | |
2365 | if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) |
2366 | && (apm_info.connection_version > 0x0100)) { |
2367 | error = apm_engage_power_management(APM_DEVICE_ALL, enable: 0); |
2368 | if (error) |
2369 | apm_error(str: "disengage power management" , err: error); |
2370 | } |
2371 | misc_deregister(misc: &apm_device); |
2372 | remove_proc_entry("apm" , NULL); |
2373 | if (power_off) |
2374 | pm_power_off = NULL; |
2375 | if (kapmd_task) { |
2376 | kthread_stop(k: kapmd_task); |
2377 | kapmd_task = NULL; |
2378 | } |
2379 | } |
2380 | |
2381 | module_init(apm_init); |
2382 | module_exit(apm_exit); |
2383 | |
2384 | MODULE_AUTHOR("Stephen Rothwell" ); |
2385 | MODULE_DESCRIPTION("Advanced Power Management" ); |
2386 | MODULE_LICENSE("GPL" ); |
2387 | module_param(debug, bool, 0644); |
2388 | MODULE_PARM_DESC(debug, "Enable debug mode" ); |
2389 | module_param(power_off, bool, 0444); |
2390 | MODULE_PARM_DESC(power_off, "Enable power off" ); |
2391 | module_param(bounce_interval, int, 0444); |
2392 | MODULE_PARM_DESC(bounce_interval, |
2393 | "Set the number of ticks to ignore suspend bounces" ); |
2394 | module_param(allow_ints, bool, 0444); |
2395 | MODULE_PARM_DESC(allow_ints, "Allow interrupts during BIOS calls" ); |
2396 | module_param(broken_psr, bool, 0444); |
2397 | MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call" ); |
2398 | module_param(realmode_power_off, bool, 0444); |
2399 | MODULE_PARM_DESC(realmode_power_off, |
2400 | "Switch to real mode before powering off" ); |
2401 | module_param(idle_threshold, int, 0444); |
2402 | MODULE_PARM_DESC(idle_threshold, |
2403 | "System idle percentage above which to make APM BIOS idle calls" ); |
2404 | module_param(idle_period, int, 0444); |
2405 | MODULE_PARM_DESC(idle_period, |
2406 | "Period (in sec/100) over which to calculate the idle percentage" ); |
2407 | module_param(smp, bool, 0444); |
2408 | MODULE_PARM_DESC(smp, |
2409 | "Set this to enable APM use on an SMP platform. Use with caution on older systems" ); |
2410 | MODULE_ALIAS_MISCDEV(APM_MINOR_DEV); |
2411 | |