-
Notifications
You must be signed in to change notification settings - Fork 13
/
tp_smapi.c
1495 lines (1333 loc) · 43.9 KB
/
tp_smapi.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* tp_smapi.c - ThinkPad SMAPI support
*
* This driver exposes some features of the System Management Application
* Program Interface (SMAPI) BIOS found on ThinkPad laptops. It works on
* models in which the SMAPI BIOS runs in SMM and is invoked by writing
* to the APM control port 0xB2.
* It also exposes battery status information, obtained from the ThinkPad
* embedded controller (via the thinkpad_ec module).
* Ancient ThinkPad models use a different interface, supported by the
* "thinkpad" module from "tpctl".
*
* Many of the battery status values obtained from the EC simply mirror
* values provided by the battery's Smart Battery System (SBS) interface, so
* their meaning is defined by the Smart Battery Data Specification (see
* http://sbs-forum.org/specs/sbdat110.pdf). References to this SBS spec
* are given in the code where relevant.
*
* Copyright (C) 2006 Shem Multinymous <[email protected]>.
* SMAPI access code based on the mwave driver by Mike Sullivan.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/mc146818rtc.h> /* CMOS defines */
#include <linux/delay.h>
#include <linux/version.h>
#include "thinkpad_ec.h"
#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#define TP_VERSION "0.44"
#define TP_DESC "ThinkPad SMAPI Support"
#define TP_DIR "smapi"
MODULE_AUTHOR("Shem Multinymous");
MODULE_DESCRIPTION(TP_DESC);
MODULE_VERSION(TP_VERSION);
MODULE_LICENSE("GPL");
static struct platform_device *pdev;
static int tp_debug;
module_param_named(debug, tp_debug, int, 0600);
MODULE_PARM_DESC(debug, "Debug level (0=off, 1=on)");
/* A few macros for printk()ing: */
#define TPRINTK(level, fmt, args...) \
dev_printk(level, &(pdev->dev), "%s: " fmt "\n", __func__, ## args)
#define DPRINTK(fmt, args...) \
do { if (tp_debug) TPRINTK(KERN_DEBUG, fmt, ## args); } while (0)
/*********************************************************************
* SMAPI interface
*/
/* SMAPI functions (register BX when making the SMM call). */
#define SMAPI_GET_INHIBIT_CHARGE 0x2114
#define SMAPI_SET_INHIBIT_CHARGE 0x2115
#define SMAPI_GET_THRESH_START 0x2116
#define SMAPI_SET_THRESH_START 0x2117
#define SMAPI_GET_FORCE_DISCHARGE 0x2118
#define SMAPI_SET_FORCE_DISCHARGE 0x2119
#define SMAPI_GET_THRESH_STOP 0x211a
#define SMAPI_SET_THRESH_STOP 0x211b
/* SMAPI error codes (see ThinkPad 770 Technical Reference Manual p.83 at
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=PFAN-3TUQQD */
#define SMAPI_RETCODE_EOF 0xff
static struct { u8 rc; char *msg; int ret; } smapi_retcode[] =
{
{0x00, "OK", 0},
{0x53, "SMAPI function is not available", -ENXIO},
{0x81, "Invalid parameter", -EINVAL},
{0x86, "Function is not supported by SMAPI BIOS", -EOPNOTSUPP},
{0x90, "System error", -EIO},
{0x91, "System is invalid", -EIO},
{0x92, "System is busy, -EBUSY"},
{0xa0, "Device error (disk read error)", -EIO},
{0xa1, "Device is busy", -EBUSY},
{0xa2, "Device is not attached", -ENXIO},
{0xa3, "Device is disbled", -EIO},
{0xa4, "Request parameter is out of range", -EINVAL},
{0xa5, "Request parameter is not accepted", -EINVAL},
{0xa6, "Transient error", -EBUSY}, /* ? */
{SMAPI_RETCODE_EOF, "Unknown error code", -EIO}
};
#define SMAPI_MAX_RETRIES 10
#define SMAPI_PORT2 0x4F /* fixed port, meaning unclear */
static unsigned short smapi_port; /* APM control port, normally 0xB2 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
static DECLARE_MUTEX(smapi_mutex);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(6,4,0)
static DEFINE_SEMAPHORE(smapi_mutex);
#else
static DEFINE_SEMAPHORE(smapi_mutex, 1);
#endif
/**
* find_smapi_port - read SMAPI port from NVRAM
*/
static int __init find_smapi_port(void)
{
u16 smapi_id = 0;
unsigned short port = 0;
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
smapi_id = CMOS_READ(0x7C);
smapi_id |= (CMOS_READ(0x7D) << 8);
spin_unlock_irqrestore(&rtc_lock, flags);
if (smapi_id != 0x5349) {
printk(KERN_ERR "SMAPI not supported (ID=0x%x)\n", smapi_id);
return -ENXIO;
}
spin_lock_irqsave(&rtc_lock, flags);
port = CMOS_READ(0x7E);
port |= (CMOS_READ(0x7F) << 8);
spin_unlock_irqrestore(&rtc_lock, flags);
if (port == 0) {
printk(KERN_ERR "unable to read SMAPI port number\n");
return -ENXIO;
}
return port;
}
/**
* smapi_request - make a SMAPI call
* @inEBX, @inECX, @inEDI, @inESI: input registers
* @outEBX, @outECX, @outEDX, @outEDI, @outESI: outputs registers
* @msg: textual error message
* Invokes the SMAPI SMBIOS with the given input and outpu args.
* All outputs are optional (can be %NULL).
* Returns 0 when successful, and a negative errno constant
* (see smapi_retcode above) upon failure.
*/
static int smapi_request(u32 inEBX, u32 inECX,
u32 inEDI, u32 inESI,
u32 *outEBX, u32 *outECX, u32 *outEDX,
u32 *outEDI, u32 *outESI, const char **msg)
{
int ret = 0;
int i;
int retries;
u8 rc;
/* Must use local vars for output regs, due to reg pressure. */
u32 tmpEAX, tmpEBX, tmpECX, tmpEDX, tmpEDI, tmpESI;
for (retries = 0; retries < SMAPI_MAX_RETRIES; ++retries) {
DPRINTK("req_in: BX=%x CX=%x DI=%x SI=%x",
inEBX, inECX, inEDI, inESI);
/* SMAPI's SMBIOS call and thinkpad_ec end up using use
* different interfaces to the same chip, so play it safe. */
ret = thinkpad_ec_lock();
if (ret)
return ret;
__asm__ __volatile__(
"movl $0x00005380,%%eax\n\t"
"movl %6,%%ebx\n\t"
"movl %7,%%ecx\n\t"
"movl %8,%%edi\n\t"
"movl %9,%%esi\n\t"
"xorl %%edx,%%edx\n\t"
"movw %10,%%dx\n\t"
"out %%al,%%dx\n\t" /* trigger SMI to SMBIOS */
"out %%al,$0x4F\n\t"
"movl %%eax,%0\n\t"
"movl %%ebx,%1\n\t"
"movl %%ecx,%2\n\t"
"movl %%edx,%3\n\t"
"movl %%edi,%4\n\t"
"movl %%esi,%5\n\t"
:"=m"(tmpEAX),
"=m"(tmpEBX),
"=m"(tmpECX),
"=m"(tmpEDX),
"=m"(tmpEDI),
"=m"(tmpESI)
:"m"(inEBX), "m"(inECX), "m"(inEDI), "m"(inESI),
"m"((u16)smapi_port)
:"%eax", "%ebx", "%ecx", "%edx", "%edi",
"%esi");
thinkpad_ec_invalidate();
thinkpad_ec_unlock();
/* Don't let the next SMAPI access happen too quickly,
* may case problems. (We're hold smapi_mutex). */
msleep(50);
if (outEBX) *outEBX = tmpEBX;
if (outECX) *outECX = tmpECX;
if (outEDX) *outEDX = tmpEDX;
if (outESI) *outESI = tmpESI;
if (outEDI) *outEDI = tmpEDI;
/* Look up error code */
rc = (tmpEAX>>8)&0xFF;
for (i = 0; smapi_retcode[i].rc != SMAPI_RETCODE_EOF &&
smapi_retcode[i].rc != rc; ++i) {}
ret = smapi_retcode[i].ret;
if (msg)
*msg = smapi_retcode[i].msg;
DPRINTK("req_out: AX=%x BX=%x CX=%x DX=%x DI=%x SI=%x r=%d",
tmpEAX, tmpEBX, tmpECX, tmpEDX, tmpEDI, tmpESI, ret);
if (ret)
TPRINTK(KERN_NOTICE, "SMAPI error: %s (func=%x)",
smapi_retcode[i].msg, inEBX);
if (ret != -EBUSY)
return ret;
}
return ret;
}
/* Convenience wrapper: discard output arguments */
static int smapi_write(u32 inEBX, u32 inECX,
u32 inEDI, u32 inESI, const char **msg)
{
return smapi_request(inEBX, inECX, inEDI, inESI,
NULL, NULL, NULL, NULL, NULL, msg);
}
/*********************************************************************
* Specific SMAPI services
* All of these functions return 0 upon success, and a negative errno
* constant (see smapi_retcode) on failure.
*/
enum thresh_type {
THRESH_STOP = 0, /* the code assumes this is 0 for brevity */
THRESH_START
};
#define THRESH_NAME(which) ((which == THRESH_START) ? "start" : "stop")
/**
* __get_real_thresh - read battery charge start/stop threshold from SMAPI
* @bat: battery number (0 or 1)
* @which: THRESH_START or THRESH_STOP
* @thresh: 1..99, 0=default 1..99, 0=default (pass this as-is to SMAPI)
* @outEDI: some additional state that needs to be preserved, meaning unknown
* @outESI: some additional state that needs to be preserved, meaning unknown
*/
static int __get_real_thresh(int bat, enum thresh_type which, int *thresh,
u32 *outEDI, u32 *outESI)
{
u32 ebx = (which == THRESH_START) ? SMAPI_GET_THRESH_START
: SMAPI_GET_THRESH_STOP;
u32 ecx = (bat+1)<<8;
const char *msg;
int ret = smapi_request(ebx, ecx, 0, 0, NULL,
&ecx, NULL, outEDI, outESI, &msg);
if (ret) {
TPRINTK(KERN_NOTICE, "cannot get %s_thresh of bat=%d: %s",
THRESH_NAME(which), bat, msg);
return ret;
}
if (!(ecx&0x00000100)) {
TPRINTK(KERN_NOTICE, "cannot get %s_thresh of bat=%d: ecx=0%x",
THRESH_NAME(which), bat, ecx);
return -EIO;
}
if (thresh)
*thresh = ecx&0xFF;
return 0;
}
/**
* get_real_thresh - read battery charge start/stop threshold from SMAPI
* @bat: battery number (0 or 1)
* @which: THRESH_START or THRESH_STOP
* @thresh: 1..99, 0=default (passes as-is to SMAPI)
*/
static int get_real_thresh(int bat, enum thresh_type which, int *thresh)
{
return __get_real_thresh(bat, which, thresh, NULL, NULL);
}
/**
* set_real_thresh - write battery start/top charge threshold to SMAPI
* @bat: battery number (0 or 1)
* @which: THRESH_START or THRESH_STOP
* @thresh: 1..99, 0=default (passes as-is to SMAPI)
*/
static int set_real_thresh(int bat, enum thresh_type which, int thresh)
{
u32 ebx = (which == THRESH_START) ? SMAPI_SET_THRESH_START
: SMAPI_SET_THRESH_STOP;
u32 ecx = ((bat+1)<<8) + thresh;
u32 getDI, getSI;
const char *msg;
int ret;
/* verify read before writing */
ret = __get_real_thresh(bat, which, NULL, &getDI, &getSI);
if (ret)
return ret;
ret = smapi_write(ebx, ecx, getDI, getSI, &msg);
if (ret)
TPRINTK(KERN_NOTICE, "set %s to %d for bat=%d failed: %s",
THRESH_NAME(which), thresh, bat, msg);
else
TPRINTK(KERN_INFO, "set %s to %d for bat=%d",
THRESH_NAME(which), thresh, bat);
return ret;
}
/**
* __get_inhibit_charge_minutes - get inhibit charge period from SMAPI
* @bat: battery number (0 or 1)
* @minutes: period in minutes (1..65535 minutes, 0=disabled)
* @outECX: some additional state that needs to be preserved, meaning unknown
* Note that @minutes is the originally set value, it does not count down.
*/
static int __get_inhibit_charge_minutes(int bat, int *minutes, u32 *outECX)
{
u32 ecx = (bat+1)<<8;
u32 esi;
const char *msg;
int ret = smapi_request(SMAPI_GET_INHIBIT_CHARGE, ecx, 0, 0,
NULL, &ecx, NULL, NULL, &esi, &msg);
if (ret) {
TPRINTK(KERN_NOTICE, "failed for bat=%d: %s", bat, msg);
return ret;
}
if (!(ecx&0x0100)) {
TPRINTK(KERN_NOTICE, "bad ecx=0x%x for bat=%d", ecx, bat);
return -EIO;
}
if (minutes)
*minutes = (ecx&0x0001)?esi:0;
if (outECX)
*outECX = ecx;
return 0;
}
/**
* get_inhibit_charge_minutes - get inhibit charge period from SMAPI
* @bat: battery number (0 or 1)
* @minutes: period in minutes (1..65535 minutes, 0=disabled)
* Note that @minutes is the originally set value, it does not count down.
*/
static int get_inhibit_charge_minutes(int bat, int *minutes)
{
return __get_inhibit_charge_minutes(bat, minutes, NULL);
}
/**
* set_inhibit_charge_minutes - write inhibit charge period to SMAPI
* @bat: battery number (0 or 1)
* @minutes: period in minutes (1..65535 minutes, 0=disabled)
*/
static int set_inhibit_charge_minutes(int bat, int minutes)
{
u32 ecx;
const char *msg;
int ret;
/* verify read before writing */
ret = __get_inhibit_charge_minutes(bat, NULL, &ecx);
if (ret)
return ret;
ecx = ((bat+1)<<8) | (ecx&0x00FE) | (minutes > 0 ? 0x0001 : 0x0000);
if (minutes > 0xFFFF)
minutes = 0xFFFF;
ret = smapi_write(SMAPI_SET_INHIBIT_CHARGE, ecx, 0, minutes, &msg);
if (ret)
TPRINTK(KERN_NOTICE,
"set to %d failed for bat=%d: %s", minutes, bat, msg);
else
TPRINTK(KERN_INFO, "set to %d for bat=%d\n", minutes, bat);
return ret;
}
/**
* get_force_discharge - get status of forced discharging from SMAPI
* @bat: battery number (0 or 1)
* @enabled: 1 if forced discharged is enabled, 0 if not
*/
static int get_force_discharge(int bat, int *enabled)
{
u32 ecx = (bat+1)<<8;
const char *msg;
int ret = smapi_request(SMAPI_GET_FORCE_DISCHARGE, ecx, 0, 0,
NULL, &ecx, NULL, NULL, NULL, &msg);
if (ret) {
TPRINTK(KERN_NOTICE, "failed for bat=%d: %s", bat, msg);
return ret;
}
*enabled = (!(ecx&0x00000100) && (ecx&0x00000001))?1:0;
return 0;
}
/**
* set_force_discharge - write status of forced discharging to SMAPI
* @bat: battery number (0 or 1)
* @enabled: 1 if forced discharged is enabled, 0 if not
*/
static int set_force_discharge(int bat, int enabled)
{
u32 ecx = (bat+1)<<8;
const char *msg;
int ret = smapi_request(SMAPI_GET_FORCE_DISCHARGE, ecx, 0, 0,
NULL, &ecx, NULL, NULL, NULL, &msg);
if (ret) {
TPRINTK(KERN_NOTICE, "get failed for bat=%d: %s", bat, msg);
return ret;
}
if (ecx&0x00000100) {
TPRINTK(KERN_NOTICE, "cannot force discharge bat=%d", bat);
return -EIO;
}
ecx = ((bat+1)<<8) | (ecx&0x000000FA) | (enabled?0x00000001:0);
ret = smapi_write(SMAPI_SET_FORCE_DISCHARGE, ecx, 0, 0, &msg);
if (ret)
TPRINTK(KERN_NOTICE, "set to %d failed for bat=%d: %s",
enabled, bat, msg);
else
TPRINTK(KERN_INFO, "set to %d for bat=%d", enabled, bat);
return ret;
}
/*********************************************************************
* Wrappers to threshold-related SMAPI functions, which handle default
* thresholds and related quirks.
*/
/* Minimum, default and minimum difference for battery charging thresholds: */
#define MIN_THRESH_DELTA 4 /* Min delta between start and stop thresh */
#define MIN_THRESH_START 2
#define MAX_THRESH_START (100-MIN_THRESH_DELTA)
#define MIN_THRESH_STOP (MIN_THRESH_START + MIN_THRESH_DELTA)
#define MAX_THRESH_STOP 100
#define DEFAULT_THRESH_START MAX_THRESH_START
#define DEFAULT_THRESH_STOP MAX_THRESH_STOP
/* The GUI of IBM's Battery Maximizer seems to show a start threshold that
* is 1 more than the value we set/get via SMAPI. Since the threshold is
* maintained across reboot, this can be confusing. So we kludge our
* interface for interoperability: */
#define BATMAX_FIX 1
/* Get charge start/stop threshold (1..100),
* substituting default values if needed and applying BATMAT_FIX. */
static int get_thresh(int bat, enum thresh_type which, int *thresh)
{
int ret = get_real_thresh(bat, which, thresh);
if (ret)
return ret;
if (*thresh == 0)
*thresh = (which == THRESH_START) ? DEFAULT_THRESH_START
: DEFAULT_THRESH_STOP;
else if (which == THRESH_START)
*thresh += BATMAX_FIX;
return 0;
}
/* Set charge start/stop threshold (1..100),
* substituting default values if needed and applying BATMAT_FIX. */
static int set_thresh(int bat, enum thresh_type which, int thresh)
{
if (which == THRESH_STOP && thresh == DEFAULT_THRESH_STOP)
thresh = 0; /* 100 is out of range, but default means 100 */
if (which == THRESH_START)
thresh -= BATMAX_FIX;
return set_real_thresh(bat, which, thresh);
}
/*********************************************************************
* ThinkPad embedded controller readout and basic functions
*/
/**
* read_tp_ec_row - read data row from the ThinkPad embedded controller
* @arg0: EC command code
* @bat: battery number, 0 or 1
* @j: the byte value to be used for "junk" (unused) input/outputs
* @dataval: result vector
*/
static int read_tp_ec_row(u8 arg0, int bat, u8 j, u8 *dataval)
{
int ret;
const struct thinkpad_ec_row args = { .mask = 0xFFFF,
.val = {arg0, j,j,j,j,j,j,j,j,j,j,j,j,j,j, (u8)bat} };
struct thinkpad_ec_row data = { .mask = 0xFFFF };
ret = thinkpad_ec_lock();
if (ret)
return ret;
ret = thinkpad_ec_read_row(&args, &data);
thinkpad_ec_unlock();
memcpy(dataval, &data.val, TP_CONTROLLER_ROW_LEN);
return ret;
}
/**
* power_device_present - check for presence of battery or AC power
* @bat: 0 for battery 0, 1 for battery 1, otherwise AC power
* Returns 1 if present, 0 if not present, negative if error.
*/
static int power_device_present(int bat)
{
u8 row[TP_CONTROLLER_ROW_LEN];
u8 test;
int ret = read_tp_ec_row(1, bat, 0, row);
if (ret)
return ret;
switch (bat) {
case 0: test = 0x40; break; /* battery 0 */
case 1: test = 0x20; break; /* battery 1 */
default: test = 0x80; /* AC power */
}
return (row[0] & test) ? 1 : 0;
}
/**
* bat_has_status - check if battery can report detailed status
* @bat: 0 for battery 0, 1 for battery 1
* Returns 1 if yes, 0 if no, negative if error.
*/
static int bat_has_status(int bat)
{
u8 row[TP_CONTROLLER_ROW_LEN];
int ret = read_tp_ec_row(1, bat, 0, row);
if (ret)
return ret;
if ((row[0] & (bat?0x20:0x40)) == 0) /* no battery */
return 0;
if ((row[1] & (0x60)) == 0) /* no status */
return 0;
return 1;
}
/**
* get_tp_ec_bat_16 - read a 16-bit value from EC battery status data
* @arg0: first argument to EC
* @off: offset in row returned from EC
* @bat: battery (0 or 1)
* @val: the 16-bit value obtained
* Returns nonzero on error.
*/
static int get_tp_ec_bat_16(u8 arg0, int offset, int bat, u16 *val)
{
u8 row[TP_CONTROLLER_ROW_LEN];
int ret;
if (bat_has_status(bat) != 1)
return -ENXIO;
ret = read_tp_ec_row(arg0, bat, 0, row);
if (ret)
return ret;
*val = *(u16 *)(row+offset);
return 0;
}
/*********************************************************************
* sysfs attributes for batteries -
* definitions and helper functions
*/
/* A custom device attribute struct which holds a battery number */
struct bat_device_attribute {
struct device_attribute dev_attr;
int bat;
};
/**
* attr_get_bat - get the battery to which the attribute belongs
*/
static int attr_get_bat(struct device_attribute *attr)
{
return container_of(attr, struct bat_device_attribute, dev_attr)->bat;
}
/**
* show_tp_ec_bat_u16 - show an unsigned 16-bit battery attribute
* @arg0: specified 1st argument of EC raw to read
* @offset: byte offset in EC raw data
* @mul: correction factor to multiply by
* @na_msg: string to output is value not available (0xFFFFFFFF)
* @attr: battery attribute
* @buf: output buffer
* The 16-bit value is read from the EC, treated as unsigned,
* transformed as x->mul*x, and printed to the buffer.
* If the value is 0xFFFFFFFF and na_msg!=%NULL, na_msg is printed instead.
*/
static ssize_t show_tp_ec_bat_u16(u8 arg0, int offset, int mul,
const char *na_msg,
struct device_attribute *attr, char *buf)
{
u16 val;
int ret = get_tp_ec_bat_16(arg0, offset, attr_get_bat(attr), &val);
if (ret)
return ret;
if (na_msg && val == 0xFFFF)
return sprintf(buf, "%s\n", na_msg);
else
return sprintf(buf, "%u\n", mul*(unsigned int)val);
}
/**
* show_tp_ec_bat_s16 - show an signed 16-bit battery attribute
* @arg0: specified 1st argument of EC raw to read
* @offset: byte offset in EC raw data
* @mul: correction factor to multiply by
* @add: correction term to add after multiplication
* @attr: battery attribute
* @buf: output buffer
* The 16-bit value is read from the EC, treated as signed,
* transformed as x->mul*x+add, and printed to the buffer.
*/
static ssize_t show_tp_ec_bat_s16(u8 arg0, int offset, int mul, int add,
struct device_attribute *attr, char *buf)
{
u16 val;
int ret = get_tp_ec_bat_16(arg0, offset, attr_get_bat(attr), &val);
if (ret)
return ret;
return sprintf(buf, "%d\n", mul*(s16)val+add);
}
/**
* show_tp_ec_bat_str - show a string from EC battery status data
* @arg0: specified 1st argument of EC raw to read
* @offset: byte offset in EC raw data
* @maxlen: maximum string length
* @attr: battery attribute
* @buf: output buffer
*/
static ssize_t show_tp_ec_bat_str(u8 arg0, int offset, int maxlen,
struct device_attribute *attr, char *buf)
{
int bat = attr_get_bat(attr);
u8 row[TP_CONTROLLER_ROW_LEN];
int ret;
if (bat_has_status(bat) != 1)
return -ENXIO;
ret = read_tp_ec_row(arg0, bat, 0, row);
if (ret)
return ret;
strncpy(buf, (char *)row+offset, maxlen);
buf[maxlen] = 0;
strcat(buf, "\n");
return strlen(buf);
}
/**
* show_tp_ec_bat_power - show a power readout from EC battery status data
* @arg0: specified 1st argument of EC raw to read
* @offV: byte offset of voltage in EC raw data
* @offI: byte offset of current in EC raw data
* @attr: battery attribute
* @buf: output buffer
* Computes the power as current*voltage from the two given readout offsets.
*/
static ssize_t show_tp_ec_bat_power(u8 arg0, int offV, int offI,
struct device_attribute *attr, char *buf)
{
u8 row[TP_CONTROLLER_ROW_LEN];
int milliamp, millivolt, ret;
int bat = attr_get_bat(attr);
if (bat_has_status(bat) != 1)
return -ENXIO;
ret = read_tp_ec_row(1, bat, 0, row);
if (ret)
return ret;
millivolt = *(u16 *)(row+offV);
milliamp = *(s16 *)(row+offI);
return sprintf(buf, "%d\n", milliamp*millivolt/1000); /* units: mW */
}
/**
* show_tp_ec_bat_date - decode and show a date from EC battery status data
* @arg0: specified 1st argument of EC raw to read
* @offset: byte offset in EC raw data
* @attr: battery attribute
* @buf: output buffer
*/
static ssize_t show_tp_ec_bat_date(u8 arg0, int offset,
struct device_attribute *attr, char *buf)
{
u8 row[TP_CONTROLLER_ROW_LEN];
u16 v;
int ret;
int day, month, year;
int bat = attr_get_bat(attr);
if (bat_has_status(bat) != 1)
return -ENXIO;
ret = read_tp_ec_row(arg0, bat, 0, row);
if (ret)
return ret;
/* Decode bit-packed: v = day | (month<<5) | ((year-1980)<<9) */
v = *(u16 *)(row+offset);
day = v & 0x1F;
month = (v >> 5) & 0xF;
year = (v >> 9) + 1980;
return sprintf(buf, "%04d-%02d-%02d\n", year, month, day);
}
/*********************************************************************
* sysfs attribute I/O for batteries -
* the actual attribute show/store functions
*/
static ssize_t show_battery_start_charge_thresh(struct device *dev,
struct device_attribute *attr, char *buf)
{
int thresh;
int bat = attr_get_bat(attr);
int ret = get_thresh(bat, THRESH_START, &thresh);
if (ret)
return ret;
return sprintf(buf, "%d\n", thresh); /* units: percent */
}
static ssize_t show_battery_stop_charge_thresh(struct device *dev,
struct device_attribute *attr, char *buf)
{
int thresh;
int bat = attr_get_bat(attr);
int ret = get_thresh(bat, THRESH_STOP, &thresh);
if (ret)
return ret;
return sprintf(buf, "%d\n", thresh); /* units: percent */
}
/**
* store_battery_start_charge_thresh - store battery_start_charge_thresh attr
* Since this is a kernel<->user interface, we ensure a valid state for
* the hardware. We do this by clamping the requested threshold to the
* valid range and, if necessary, moving the other threshold so that
* it's MIN_THRESH_DELTA away from this one.
*/
static ssize_t store_battery_start_charge_thresh(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int thresh, other_thresh, ret;
int bat = attr_get_bat(attr);
if (sscanf(buf, "%d", &thresh) != 1 || thresh < 1 || thresh > 100)
return -EINVAL;
if (thresh < MIN_THRESH_START) /* clamp up to MIN_THRESH_START */
thresh = MIN_THRESH_START;
if (thresh > MAX_THRESH_START) /* clamp down to MAX_THRESH_START */
thresh = MAX_THRESH_START;
down(&smapi_mutex);
ret = get_thresh(bat, THRESH_STOP, &other_thresh);
if (ret != -EOPNOTSUPP && ret != -ENXIO) {
if (ret) /* other threshold is set? */
goto out;
ret = get_real_thresh(bat, THRESH_START, NULL);
if (ret) /* this threshold is set? */
goto out;
if (other_thresh < thresh+MIN_THRESH_DELTA) {
/* move other thresh to keep it above this one */
ret = set_thresh(bat, THRESH_STOP,
thresh+MIN_THRESH_DELTA);
if (ret)
goto out;
}
}
ret = set_thresh(bat, THRESH_START, thresh);
out:
up(&smapi_mutex);
return count;
}
/**
* store_battery_stop_charge_thresh - store battery_stop_charge_thresh attr
* Since this is a kernel<->user interface, we ensure a valid state for
* the hardware. We do this by clamping the requested threshold to the
* valid range and, if necessary, moving the other threshold so that
* it's MIN_THRESH_DELTA away from this one.
*/
static ssize_t store_battery_stop_charge_thresh(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int thresh, other_thresh, ret;
int bat = attr_get_bat(attr);
if (sscanf(buf, "%d", &thresh) != 1 || thresh < 1 || thresh > 100)
return -EINVAL;
if (thresh < MIN_THRESH_STOP) /* clamp up to MIN_THRESH_STOP */
thresh = MIN_THRESH_STOP;
down(&smapi_mutex);
ret = get_thresh(bat, THRESH_START, &other_thresh);
if (ret != -EOPNOTSUPP && ret != -ENXIO) { /* other threshold exists? */
if (ret)
goto out;
/* this threshold exists? */
ret = get_real_thresh(bat, THRESH_STOP, NULL);
if (ret)
goto out;
if (other_thresh >= thresh-MIN_THRESH_DELTA) {
/* move other thresh to be below this one */
ret = set_thresh(bat, THRESH_START,
thresh-MIN_THRESH_DELTA);
if (ret)
goto out;
}
}
ret = set_thresh(bat, THRESH_STOP, thresh);
out:
up(&smapi_mutex);
return count;
}
static ssize_t show_battery_inhibit_charge_minutes(struct device *dev,
struct device_attribute *attr, char *buf)
{
int minutes;
int bat = attr_get_bat(attr);
int ret = get_inhibit_charge_minutes(bat, &minutes);
if (ret)
return ret;
return sprintf(buf, "%d\n", minutes); /* units: minutes */
}
static ssize_t store_battery_inhibit_charge_minutes(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
int minutes;
int bat = attr_get_bat(attr);
if (sscanf(buf, "%d", &minutes) != 1 || minutes < 0) {
TPRINTK(KERN_ERR, "inhibit_charge_minutes: "
"must be a non-negative integer");
return -EINVAL;
}
ret = set_inhibit_charge_minutes(bat, minutes);
if (ret)
return ret;
return count;
}
static ssize_t show_battery_force_discharge(struct device *dev,
struct device_attribute *attr, char *buf)
{
int enabled;
int bat = attr_get_bat(attr);
int ret = get_force_discharge(bat, &enabled);
if (ret)
return ret;
return sprintf(buf, "%d\n", enabled); /* type: boolean */
}
static ssize_t store_battery_force_discharge(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret;
int enabled;
int bat = attr_get_bat(attr);
if (sscanf(buf, "%d", &enabled) != 1 || enabled < 0 || enabled > 1)
return -EINVAL;
ret = set_force_discharge(bat, enabled);
if (ret)
return ret;
return count;
}
static ssize_t show_battery_installed(
struct device *dev, struct device_attribute *attr, char *buf)
{
int bat = attr_get_bat(attr);
int ret = power_device_present(bat);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret); /* type: boolean */
}
static ssize_t show_battery_state(
struct device *dev, struct device_attribute *attr, char *buf)
{
u8 row[TP_CONTROLLER_ROW_LEN];
const char *txt;
int ret;
int bat = attr_get_bat(attr);
if (bat_has_status(bat) != 1)
return sprintf(buf, "none\n");
ret = read_tp_ec_row(1, bat, 0, row);
if (ret)
return ret;
switch (row[1] & 0xf0) {
case 0xc0: txt = "idle"; break;
case 0xd0: txt = "discharging"; break;
case 0xe0: txt = "charging"; break;
default: return sprintf(buf, "unknown (0x%x)\n", row[1]);
}
return sprintf(buf, "%s\n", txt); /* type: string from fixed set */
}
static ssize_t show_battery_manufacturer(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* type: string. SBS spec v1.1 p34: ManufacturerName() */
return show_tp_ec_bat_str(4, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf);
}
static ssize_t show_battery_model(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* type: string. SBS spec v1.1 p34: DeviceName() */
return show_tp_ec_bat_str(5, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf);
}
static ssize_t show_battery_barcoding(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* type: string */
return show_tp_ec_bat_str(7, 2, TP_CONTROLLER_ROW_LEN-2, attr, buf);
}
static ssize_t show_battery_chemistry(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* type: string. SBS spec v1.1 p34-35: DeviceChemistry() */
return show_tp_ec_bat_str(6, 2, 5, attr, buf);
}
static ssize_t show_battery_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV. SBS spec v1.1 p24: Voltage() */
return show_tp_ec_bat_u16(1, 6, 1, NULL, attr, buf);
}
static ssize_t show_battery_design_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV. SBS spec v1.1 p32: DesignVoltage() */
return show_tp_ec_bat_u16(3, 4, 1, NULL, attr, buf);
}
static ssize_t show_battery_charging_max_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV. SBS spec v1.1 p37,39: ChargingVoltage() */
return show_tp_ec_bat_u16(9, 8, 1, NULL, attr, buf);
}
static ssize_t show_battery_group0_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV */
return show_tp_ec_bat_u16(0xA, 12, 1, NULL, attr, buf);
}
static ssize_t show_battery_group1_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV */
return show_tp_ec_bat_u16(0xA, 10, 1, NULL, attr, buf);
}
static ssize_t show_battery_group2_voltage(
struct device *dev, struct device_attribute *attr, char *buf)
{
/* units: mV */
return show_tp_ec_bat_u16(0xA, 8, 1, NULL, attr, buf);
}