summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/rtas-proc.c
blob: 487dcd8da4deef1fef723cd3ca7368087f16fe7d (plain)
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
// SPDX-License-Identifier: GPL-2.0
/*
 *   Copyright (C) 2000 Tilmann Bitterberg
 *   (tilmann@bitterberg.de)
 *
 *   RTAS (Runtime Abstraction Services) stuff
 *   Intention is to provide a clean user interface
 *   to use the RTAS.
 *
 *   TODO:
 *   Split off a header file and maybe move it to a different
 *   location. Write Documentation on what the /proc/rtas/ entries
 *   actually do.
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <linux/time.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/bitops.h>
#include <linux/rtc.h>

#include <linux/uaccess.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/machdep.h> /* for ppc_md */
#include <asm/time.h>

/* Token for Sensors */
#define KEY_SWITCH		0x0001
#define ENCLOSURE_SWITCH	0x0002
#define THERMAL_SENSOR		0x0003
#define LID_STATUS		0x0004
#define POWER_SOURCE		0x0005
#define BATTERY_VOLTAGE		0x0006
#define BATTERY_REMAINING	0x0007
#define BATTERY_PERCENTAGE	0x0008
#define EPOW_SENSOR		0x0009
#define BATTERY_CYCLESTATE	0x000a
#define BATTERY_CHARGING	0x000b

/* IBM specific sensors */
#define IBM_SURVEILLANCE	0x2328 /* 9000 */
#define IBM_FANRPM		0x2329 /* 9001 */
#define IBM_VOLTAGE		0x232a /* 9002 */
#define IBM_DRCONNECTOR		0x232b /* 9003 */
#define IBM_POWERSUPPLY		0x232c /* 9004 */

/* Status return values */
#define SENSOR_CRITICAL_HIGH	13
#define SENSOR_WARNING_HIGH	12
#define SENSOR_NORMAL		11
#define SENSOR_WARNING_LOW	10
#define SENSOR_CRITICAL_LOW	 9
#define SENSOR_SUCCESS		 0
#define SENSOR_HW_ERROR		-1
#define SENSOR_BUSY		-2
#define SENSOR_NOT_EXIST	-3
#define SENSOR_DR_ENTITY	-9000

/* Location Codes */
#define LOC_SCSI_DEV_ADDR	'A'
#define LOC_SCSI_DEV_LOC	'B'
#define LOC_CPU			'C'
#define LOC_DISKETTE		'D'
#define LOC_ETHERNET		'E'
#define LOC_FAN			'F'
#define LOC_GRAPHICS		'G'
/* reserved / not used		'H' */
#define LOC_IO_ADAPTER		'I'
/* reserved / not used		'J' */
#define LOC_KEYBOARD		'K'
#define LOC_LCD			'L'
#define LOC_MEMORY		'M'
#define LOC_NV_MEMORY		'N'
#define LOC_MOUSE		'O'
#define LOC_PLANAR		'P'
#define LOC_OTHER_IO		'Q'
#define LOC_PARALLEL		'R'
#define LOC_SERIAL		'S'
#define LOC_DEAD_RING		'T'
#define LOC_RACKMOUNTED		'U' /* for _u_nit is rack mounted */
#define LOC_VOLTAGE		'V'
#define LOC_SWITCH_ADAPTER	'W'
#define LOC_OTHER		'X'
#define LOC_FIRMWARE		'Y'
#define LOC_SCSI		'Z'

/* Tokens for indicators */
#define TONE_FREQUENCY		0x0001 /* 0 - 1000 (HZ)*/
#define TONE_VOLUME		0x0002 /* 0 - 100 (%) */
#define SYSTEM_POWER_STATE	0x0003 
#define WARNING_LIGHT		0x0004
#define DISK_ACTIVITY_LIGHT	0x0005
#define HEX_DISPLAY_UNIT	0x0006
#define BATTERY_WARNING_TIME	0x0007
#define CONDITION_CYCLE_REQUEST	0x0008
#define SURVEILLANCE_INDICATOR	0x2328 /* 9000 */
#define DR_ACTION		0x2329 /* 9001 */
#define DR_INDICATOR		0x232a /* 9002 */
/* 9003 - 9004: Vendor specific */
/* 9006 - 9999: Vendor specific */

/* other */
#define MAX_SENSORS		 17  /* I only know of 17 sensors */    
#define MAX_LINELENGTH          256
#define SENSOR_PREFIX		"ibm,sensor-"
#define cel_to_fahr(x)		((x*9/5)+32)

struct individual_sensor {
	unsigned int token;
	unsigned int quant;
};

struct rtas_sensors {
        struct individual_sensor sensor[MAX_SENSORS];
	unsigned int quant;
};

/* Globals */
static struct rtas_sensors sensors;
static struct device_node *rtas_node = NULL;
static unsigned long power_on_time = 0; /* Save the time the user set */
static char progress_led[MAX_LINELENGTH];

static unsigned long rtas_tone_frequency = 1000;
static unsigned long rtas_tone_volume = 0;

/* ****************************************************************** */
/* Declarations */
static int ppc_rtas_sensors_show(struct seq_file *m, void *v);
static int ppc_rtas_clock_show(struct seq_file *m, void *v);
static ssize_t ppc_rtas_clock_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos);
static int ppc_rtas_progress_show(struct seq_file *m, void *v);
static ssize_t ppc_rtas_progress_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos);
static int ppc_rtas_poweron_show(struct seq_file *m, void *v);
static ssize_t ppc_rtas_poweron_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos);

static ssize_t ppc_rtas_tone_freq_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos);
static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v);
static ssize_t ppc_rtas_tone_volume_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos);
static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v);
static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v);

static int poweron_open(struct inode *inode, struct file *file)
{
	return single_open(file, ppc_rtas_poweron_show, NULL);
}

static const struct file_operations ppc_rtas_poweron_operations = {
	.open		= poweron_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.write		= ppc_rtas_poweron_write,
	.release	= single_release,
};

static int progress_open(struct inode *inode, struct file *file)
{
	return single_open(file, ppc_rtas_progress_show, NULL);
}

static const struct file_operations ppc_rtas_progress_operations = {
	.open		= progress_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.write		= ppc_rtas_progress_write,
	.release	= single_release,
};

static int clock_open(struct inode *inode, struct file *file)
{
	return single_open(file, ppc_rtas_clock_show, NULL);
}

static const struct file_operations ppc_rtas_clock_operations = {
	.open		= clock_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.write		= ppc_rtas_clock_write,
	.release	= single_release,
};

static int tone_freq_open(struct inode *inode, struct file *file)
{
	return single_open(file, ppc_rtas_tone_freq_show, NULL);
}

static const struct file_operations ppc_rtas_tone_freq_operations = {
	.open		= tone_freq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.write		= ppc_rtas_tone_freq_write,
	.release	= single_release,
};

static int tone_volume_open(struct inode *inode, struct file *file)
{
	return single_open(file, ppc_rtas_tone_volume_show, NULL);
}

static const struct file_operations ppc_rtas_tone_volume_operations = {
	.open		= tone_volume_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.write		= ppc_rtas_tone_volume_write,
	.release	= single_release,
};

static int ppc_rtas_find_all_sensors(void);
static void ppc_rtas_process_sensor(struct seq_file *m,
	struct individual_sensor *s, int state, int error, const char *loc);
static char *ppc_rtas_process_error(int error);
static void get_location_code(struct seq_file *m,
	struct individual_sensor *s, const char *loc);
static void check_location_string(struct seq_file *m, const char *c);
static void check_location(struct seq_file *m, const char *c);

static int __init proc_rtas_init(void)
{
	if (!machine_is(pseries))
		return -ENODEV;

	rtas_node = of_find_node_by_name(NULL, "rtas");
	if (rtas_node == NULL)
		return -ENODEV;

	proc_create("powerpc/rtas/progress", 0644, NULL,
		    &ppc_rtas_progress_operations);
	proc_create("powerpc/rtas/clock", 0644, NULL,
		    &ppc_rtas_clock_operations);
	proc_create("powerpc/rtas/poweron", 0644, NULL,
		    &ppc_rtas_poweron_operations);
	proc_create_single("powerpc/rtas/sensors", 0444, NULL,
			ppc_rtas_sensors_show);
	proc_create("powerpc/rtas/frequency", 0644, NULL,
		    &ppc_rtas_tone_freq_operations);
	proc_create("powerpc/rtas/volume", 0644, NULL,
		    &ppc_rtas_tone_volume_operations);
	proc_create_single("powerpc/rtas/rmo_buffer", 0400, NULL,
			ppc_rtas_rmo_buf_show);
	return 0;
}

__initcall(proc_rtas_init);

static int parse_number(const char __user *p, size_t count, u64 *val)
{
	char buf[40];
	char *end;

	if (count > 39)
		return -EINVAL;

	if (copy_from_user(buf, p, count))
		return -EFAULT;

	buf[count] = 0;

	*val = simple_strtoull(buf, &end, 10);
	if (*end && *end != '\n')
		return -EINVAL;

	return 0;
}

/* ****************************************************************** */
/* POWER-ON-TIME                                                      */
/* ****************************************************************** */
static ssize_t ppc_rtas_poweron_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	time64_t nowtime;
	int error = parse_number(buf, count, &nowtime);
	if (error)
		return error;

	power_on_time = nowtime; /* save the time */

	rtc_time64_to_tm(nowtime, &tm);

	error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL, 
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
	if (error)
		printk(KERN_WARNING "error: setting poweron time returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static int ppc_rtas_poweron_show(struct seq_file *m, void *v)
{
	if (power_on_time == 0)
		seq_printf(m, "Power on time not set\n");
	else
		seq_printf(m, "%lu\n",power_on_time);
	return 0;
}

/* ****************************************************************** */
/* PROGRESS                                                           */
/* ****************************************************************** */
static ssize_t ppc_rtas_progress_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	unsigned long hex;

	if (count >= MAX_LINELENGTH)
		count = MAX_LINELENGTH -1;
	if (copy_from_user(progress_led, buf, count)) { /* save the string */
		return -EFAULT;
	}
	progress_led[count] = 0;

	/* Lets see if the user passed hexdigits */
	hex = simple_strtoul(progress_led, NULL, 10);

	rtas_progress ((char *)progress_led, hex);
	return count;

	/* clear the line */
	/* rtas_progress("                   ", 0xffff);*/
}
/* ****************************************************************** */
static int ppc_rtas_progress_show(struct seq_file *m, void *v)
{
	if (progress_led[0])
		seq_printf(m, "%s\n", progress_led);
	return 0;
}

/* ****************************************************************** */
/* CLOCK                                                              */
/* ****************************************************************** */
static ssize_t ppc_rtas_clock_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	time64_t nowtime;
	int error = parse_number(buf, count, &nowtime);
	if (error)
		return error;

	rtc_time64_to_tm(nowtime, &tm);
	error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, 
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
	if (error)
		printk(KERN_WARNING "error: setting the clock returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static int ppc_rtas_clock_show(struct seq_file *m, void *v)
{
	int ret[8];
	int error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);

	if (error) {
		printk(KERN_WARNING "error: reading the clock returned: %s\n", 
				ppc_rtas_process_error(error));
		seq_printf(m, "0");
	} else { 
		unsigned int year, mon, day, hour, min, sec;
		year = ret[0]; mon  = ret[1]; day  = ret[2];
		hour = ret[3]; min  = ret[4]; sec  = ret[5];
		seq_printf(m, "%lld\n",
				mktime64(year, mon, day, hour, min, sec));
	}
	return 0;
}

/* ****************************************************************** */
/* SENSOR STUFF                                                       */
/* ****************************************************************** */
static int ppc_rtas_sensors_show(struct seq_file *m, void *v)
{
	int i,j;
	int state, error;
	int get_sensor_state = rtas_token("get-sensor-state");

	seq_printf(m, "RTAS (RunTime Abstraction Services) Sensor Information\n");
	seq_printf(m, "Sensor\t\tValue\t\tCondition\tLocation\n");
	seq_printf(m, "********************************************************\n");

	if (ppc_rtas_find_all_sensors() != 0) {
		seq_printf(m, "\nNo sensors are available\n");
		return 0;
	}

	for (i=0; i<sensors.quant; i++) {
		struct individual_sensor *p = &sensors.sensor[i];
		char rstr[64];
		const char *loc;
		int llen, offs;

		sprintf (rstr, SENSOR_PREFIX"%04d", p->token);
		loc = of_get_property(rtas_node, rstr, &llen);

		/* A sensor may have multiple instances */
		for (j = 0, offs = 0; j <= p->quant; j++) {
			error =	rtas_call(get_sensor_state, 2, 2, &state, 
				  	  p->token, j);

			ppc_rtas_process_sensor(m, p, state, error, loc);
			seq_putc(m, '\n');
			if (loc) {
				offs += strlen(loc) + 1;
				loc += strlen(loc) + 1;
				if (offs >= llen)
					loc = NULL;
			}
		}
	}
	return 0;
}

/* ****************************************************************** */

static int ppc_rtas_find_all_sensors(void)
{
	const unsigned int *utmp;
	int len, i;

	utmp = of_get_property(rtas_node, "rtas-sensors", &len);
	if (utmp == NULL) {
		printk (KERN_ERR "error: could not get rtas-sensors\n");
		return 1;
	}

	sensors.quant = len / 8;      /* int + int */

	for (i=0; i<sensors.quant; i++) {
		sensors.sensor[i].token = *utmp++;
		sensors.sensor[i].quant = *utmp++;
	}
	return 0;
}

/* ****************************************************************** */
/*
 * Builds a string of what rtas returned
 */
static char *ppc_rtas_process_error(int error)
{
	switch (error) {
		case SENSOR_CRITICAL_HIGH:
			return "(critical high)";
		case SENSOR_WARNING_HIGH:
			return "(warning high)";
		case SENSOR_NORMAL:
			return "(normal)";
		case SENSOR_WARNING_LOW:
			return "(warning low)";
		case SENSOR_CRITICAL_LOW:
			return "(critical low)";
		case SENSOR_SUCCESS:
			return "(read ok)";
		case SENSOR_HW_ERROR:
			return "(hardware error)";
		case SENSOR_BUSY:
			return "(busy)";
		case SENSOR_NOT_EXIST:
			return "(non existent)";
		case SENSOR_DR_ENTITY:
			return "(dr entity removed)";
		default:
			return "(UNKNOWN)";
	}
}

/* ****************************************************************** */
/*
 * Builds a string out of what the sensor said
 */

static void ppc_rtas_process_sensor(struct seq_file *m,
	struct individual_sensor *s, int state, int error, const char *loc)
{
	/* Defined return vales */
	const char * key_switch[]        = { "Off\t", "Normal\t", "Secure\t", 
						"Maintenance" };
	const char * enclosure_switch[]  = { "Closed", "Open" };
	const char * lid_status[]        = { " ", "Open", "Closed" };
	const char * power_source[]      = { "AC\t", "Battery", 
		  				"AC & Battery" };
	const char * battery_remaining[] = { "Very Low", "Low", "Mid", "High" };
	const char * epow_sensor[]       = { 
		"EPOW Reset", "Cooling warning", "Power warning",
		"System shutdown", "System halt", "EPOW main enclosure",
		"EPOW power off" };
	const char * battery_cyclestate[]  = { "None", "In progress", 
						"Requested" };
	const char * battery_charging[]    = { "Charging", "Discharging",
						"No current flow" };
	const char * ibm_drconnector[]     = { "Empty", "Present", "Unusable", 
						"Exchange" };

	int have_strings = 0;
	int num_states = 0;
	int temperature = 0;
	int unknown = 0;

	/* What kind of sensor do we have here? */
	
	switch (s->token) {
		case KEY_SWITCH:
			seq_printf(m, "Key switch:\t");
			num_states = sizeof(key_switch) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", key_switch[state]);
				have_strings = 1;
			}
			break;
		case ENCLOSURE_SWITCH:
			seq_printf(m, "Enclosure switch:\t");
			num_states = sizeof(enclosure_switch) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", 
						enclosure_switch[state]);
				have_strings = 1;
			}
			break;
		case THERMAL_SENSOR:
			seq_printf(m, "Temp. (C/F):\t");
			temperature = 1;
			break;
		case LID_STATUS:
			seq_printf(m, "Lid status:\t");
			num_states = sizeof(lid_status) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", lid_status[state]);
				have_strings = 1;
			}
			break;
		case POWER_SOURCE:
			seq_printf(m, "Power source:\t");
			num_states = sizeof(power_source) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", 
						power_source[state]);
				have_strings = 1;
			}
			break;
		case BATTERY_VOLTAGE:
			seq_printf(m, "Battery voltage:\t");
			break;
		case BATTERY_REMAINING:
			seq_printf(m, "Battery remaining:\t");
			num_states = sizeof(battery_remaining) / sizeof(char *);
			if (state < num_states)
			{
				seq_printf(m, "%s\t", 
						battery_remaining[state]);
				have_strings = 1;
			}
			break;
		case BATTERY_PERCENTAGE:
			seq_printf(m, "Battery percentage:\t");
			break;
		case EPOW_SENSOR:
			seq_printf(m, "EPOW Sensor:\t");
			num_states = sizeof(epow_sensor) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", epow_sensor[state]);
				have_strings = 1;
			}
			break;
		case BATTERY_CYCLESTATE:
			seq_printf(m, "Battery cyclestate:\t");
			num_states = sizeof(battery_cyclestate) / 
				     	sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", 
						battery_cyclestate[state]);
				have_strings = 1;
			}
			break;
		case BATTERY_CHARGING:
			seq_printf(m, "Battery Charging:\t");
			num_states = sizeof(battery_charging) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", 
						battery_charging[state]);
				have_strings = 1;
			}
			break;
		case IBM_SURVEILLANCE:
			seq_printf(m, "Surveillance:\t");
			break;
		case IBM_FANRPM:
			seq_printf(m, "Fan (rpm):\t");
			break;
		case IBM_VOLTAGE:
			seq_printf(m, "Voltage (mv):\t");
			break;
		case IBM_DRCONNECTOR:
			seq_printf(m, "DR connector:\t");
			num_states = sizeof(ibm_drconnector) / sizeof(char *);
			if (state < num_states) {
				seq_printf(m, "%s\t", 
						ibm_drconnector[state]);
				have_strings = 1;
			}
			break;
		case IBM_POWERSUPPLY:
			seq_printf(m, "Powersupply:\t");
			break;
		default:
			seq_printf(m,  "Unknown sensor (type %d), ignoring it\n",
					s->token);
			unknown = 1;
			have_strings = 1;
			break;
	}
	if (have_strings == 0) {
		if (temperature) {
			seq_printf(m, "%4d /%4d\t", state, cel_to_fahr(state));
		} else
			seq_printf(m, "%10d\t", state);
	}
	if (unknown == 0) {
		seq_printf(m, "%s\t", ppc_rtas_process_error(error));
		get_location_code(m, s, loc);
	}
}

/* ****************************************************************** */

static void check_location(struct seq_file *m, const char *c)
{
	switch (c[0]) {
		case LOC_PLANAR:
			seq_printf(m, "Planar #%c", c[1]);
			break;
		case LOC_CPU:
			seq_printf(m, "CPU #%c", c[1]);
			break;
		case LOC_FAN:
			seq_printf(m, "Fan #%c", c[1]);
			break;
		case LOC_RACKMOUNTED:
			seq_printf(m, "Rack #%c", c[1]);
			break;
		case LOC_VOLTAGE:
			seq_printf(m, "Voltage #%c", c[1]);
			break;
		case LOC_LCD:
			seq_printf(m, "LCD #%c", c[1]);
			break;
		case '.':
			seq_printf(m, "- %c", c[1]);
			break;
		default:
			seq_printf(m, "Unknown location");
			break;
	}
}


/* ****************************************************************** */
/* 
 * Format: 
 * ${LETTER}${NUMBER}[[-/]${LETTER}${NUMBER} [ ... ] ]
 * the '.' may be an abbreviation
 */
static void check_location_string(struct seq_file *m, const char *c)
{
	while (*c) {
		if (isalpha(*c) || *c == '.')
			check_location(m, c);
		else if (*c == '/' || *c == '-')
			seq_printf(m, " at ");
		c++;
	}
}


/* ****************************************************************** */

static void get_location_code(struct seq_file *m, struct individual_sensor *s,
		const char *loc)
{
	if (!loc || !*loc) {
		seq_printf(m, "---");/* does not have a location */
	} else {
		check_location_string(m, loc);
	}
	seq_putc(m, ' ');
}
/* ****************************************************************** */
/* INDICATORS - Tone Frequency                                        */
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_freq_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	u64 freq;
	int error = parse_number(buf, count, &freq);
	if (error)
		return error;

	rtas_tone_frequency = freq; /* save it for later */
	error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL,
			TONE_FREQUENCY, 0, freq);
	if (error)
		printk(KERN_WARNING "error: setting tone frequency returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static int ppc_rtas_tone_freq_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%lu\n", rtas_tone_frequency);
	return 0;
}
/* ****************************************************************** */
/* INDICATORS - Tone Volume                                           */
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_volume_write(struct file *file,
		const char __user *buf, size_t count, loff_t *ppos)
{
	u64 volume;
	int error = parse_number(buf, count, &volume);
	if (error)
		return error;

	if (volume > 100)
		volume = 100;
	
        rtas_tone_volume = volume; /* save it for later */
	error = rtas_call(rtas_token("set-indicator"), 3, 1, NULL,
			TONE_VOLUME, 0, volume);
	if (error)
		printk(KERN_WARNING "error: setting tone volume returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static int ppc_rtas_tone_volume_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%lu\n", rtas_tone_volume);
	return 0;
}

#define RMO_READ_BUF_MAX 30

/* RTAS Userspace access */
static int ppc_rtas_rmo_buf_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%016lx %x\n", rtas_rmo_buf, RTAS_RMOBUF_MAX);
	return 0;
}