summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/ibmpowernv.c
blob: 0298745d46e40626de00a1e36474b242f302adcf (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
/*
 * IBM PowerNV platform sensors for temperature/fan/voltage/power
 * Copyright (C) 2014 IBM
 *
 * 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.
 */

#define DRVNAME		"ibmpowernv"
#define pr_fmt(fmt)	DRVNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <linux/platform_device.h>
#include <asm/opal.h>
#include <linux/err.h>
#include <asm/cputhreads.h>
#include <asm/smp.h>

#define MAX_ATTR_LEN	32
#define MAX_LABEL_LEN	64

/* Sensor suffix name from DT */
#define DT_FAULT_ATTR_SUFFIX		"faulted"
#define DT_DATA_ATTR_SUFFIX		"data"
#define DT_THRESHOLD_ATTR_SUFFIX	"thrs"

/*
 * Enumerates all the types of sensors in the POWERNV platform and does index
 * into 'struct sensor_group'
 */
enum sensors {
	FAN,
	TEMP,
	POWER_SUPPLY,
	POWER_INPUT,
	CURRENT,
	ENERGY,
	MAX_SENSOR_TYPE,
};

#define INVALID_INDEX (-1U)

/*
 * 'compatible' string properties for sensor types as defined in old
 * PowerNV firmware (skiboot). These are ordered as 'enum sensors'.
 */
static const char * const legacy_compatibles[] = {
	"ibm,opal-sensor-cooling-fan",
	"ibm,opal-sensor-amb-temp",
	"ibm,opal-sensor-power-supply",
	"ibm,opal-sensor-power"
};

static struct sensor_group {
	const char *name; /* matches property 'sensor-type' */
	struct attribute_group group;
	u32 attr_count;
	u32 hwmon_index;
} sensor_groups[] = {
	{ "fan"   },
	{ "temp"  },
	{ "in"    },
	{ "power" },
	{ "curr"  },
	{ "energy" },
};

struct sensor_data {
	u32 id; /* An opaque id of the firmware for each sensor */
	u32 hwmon_index;
	u32 opal_index;
	enum sensors type;
	char label[MAX_LABEL_LEN];
	char name[MAX_ATTR_LEN];
	struct device_attribute dev_attr;
};

struct platform_data {
	const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
	u32 sensors_count; /* Total count of sensors from each group */
};

static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
			   char *buf)
{
	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
						 dev_attr);
	ssize_t ret;
	u64 x;

	ret =  opal_get_sensor_data_u64(sdata->id, &x);

	if (ret)
		return ret;

	/* Convert temperature to milli-degrees */
	if (sdata->type == TEMP)
		x *= 1000;
	/* Convert power to micro-watts */
	else if (sdata->type == POWER_INPUT)
		x *= 1000000;

	return sprintf(buf, "%llu\n", x);
}

static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
			  char *buf)
{
	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
						 dev_attr);

	return sprintf(buf, "%s\n", sdata->label);
}

static int __init get_logical_cpu(int hwcpu)
{
	int cpu;

	for_each_possible_cpu(cpu)
		if (get_hard_smp_processor_id(cpu) == hwcpu)
			return cpu;

	return -ENOENT;
}

static void __init make_sensor_label(struct device_node *np,
				     struct sensor_data *sdata,
				     const char *label)
{
	u32 id;
	size_t n;

	n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);

	/*
	 * Core temp pretty print
	 */
	if (!of_property_read_u32(np, "ibm,pir", &id)) {
		int cpuid = get_logical_cpu(id);

		if (cpuid >= 0)
			/*
			 * The digital thermal sensors are associated
			 * with a core.
			 */
			n += snprintf(sdata->label + n,
				      sizeof(sdata->label) - n, " %d",
				      cpuid);
		else
			n += snprintf(sdata->label + n,
				      sizeof(sdata->label) - n, " phy%d", id);
	}

	/*
	 * Membuffer pretty print
	 */
	if (!of_property_read_u32(np, "ibm,chip-id", &id))
		n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
			      " %d", id & 0xffff);
}

static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
{
	char *hash_pos = strchr(name, '#');
	char buf[8] = { 0 };
	char *dash_pos;
	u32 copy_len;
	int err;

	if (!hash_pos)
		return -EINVAL;

	dash_pos = strchr(hash_pos, '-');
	if (!dash_pos)
		return -EINVAL;

	copy_len = dash_pos - hash_pos - 1;
	if (copy_len >= sizeof(buf))
		return -EINVAL;

	strncpy(buf, hash_pos + 1, copy_len);

	err = kstrtou32(buf, 10, index);
	if (err)
		return err;

	strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);

	return 0;
}

static const char *convert_opal_attr_name(enum sensors type,
					  const char *opal_attr)
{
	const char *attr_name = NULL;

	if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
		attr_name = "fault";
	} else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
		attr_name = "input";
	} else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
		if (type == TEMP)
			attr_name = "max";
		else if (type == FAN)
			attr_name = "min";
	}

	return attr_name;
}

/*
 * This function translates the DT node name into the 'hwmon' attribute name.
 * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
 * which need to be mapped as fan2_input, temp1_max respectively before
 * populating them inside hwmon device class.
 */
static const char *parse_opal_node_name(const char *node_name,
					enum sensors type, u32 *index)
{
	char attr_suffix[MAX_ATTR_LEN];
	const char *attr_name;
	int err;

	err = get_sensor_index_attr(node_name, index, attr_suffix);
	if (err)
		return ERR_PTR(err);

	attr_name = convert_opal_attr_name(type, attr_suffix);
	if (!attr_name)
		return ERR_PTR(-ENOENT);

	return attr_name;
}

static int get_sensor_type(struct device_node *np)
{
	enum sensors type;
	const char *str;

	for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) {
		if (of_device_is_compatible(np, legacy_compatibles[type]))
			return type;
	}

	/*
	 * Let's check if we have a newer device tree
	 */
	if (!of_device_is_compatible(np, "ibm,opal-sensor"))
		return MAX_SENSOR_TYPE;

	if (of_property_read_string(np, "sensor-type", &str))
		return MAX_SENSOR_TYPE;

	for (type = 0; type < MAX_SENSOR_TYPE; type++)
		if (!strcmp(str, sensor_groups[type].name))
			return type;

	return MAX_SENSOR_TYPE;
}

static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
				  struct sensor_data *sdata_table, int count)
{
	int i;

	/*
	 * We don't use the OPAL index on newer device trees
	 */
	if (sdata->opal_index != INVALID_INDEX) {
		for (i = 0; i < count; i++)
			if (sdata_table[i].opal_index == sdata->opal_index &&
			    sdata_table[i].type == sdata->type)
				return sdata_table[i].hwmon_index;
	}
	return ++sensor_groups[sdata->type].hwmon_index;
}

static int populate_attr_groups(struct platform_device *pdev)
{
	struct platform_data *pdata = platform_get_drvdata(pdev);
	const struct attribute_group **pgroups = pdata->attr_groups;
	struct device_node *opal, *np;
	enum sensors type;

	opal = of_find_node_by_path("/ibm,opal/sensors");
	for_each_child_of_node(opal, np) {
		const char *label;

		if (np->name == NULL)
			continue;

		type = get_sensor_type(np);
		if (type == MAX_SENSOR_TYPE)
			continue;

		sensor_groups[type].attr_count++;

		/*
		 * add attributes for labels, min and max
		 */
		if (!of_property_read_string(np, "label", &label))
			sensor_groups[type].attr_count++;
		if (of_find_property(np, "sensor-data-min", NULL))
			sensor_groups[type].attr_count++;
		if (of_find_property(np, "sensor-data-max", NULL))
			sensor_groups[type].attr_count++;
	}

	of_node_put(opal);

	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
		sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
					sizeof(struct attribute *) *
					(sensor_groups[type].attr_count + 1),
					GFP_KERNEL);
		if (!sensor_groups[type].group.attrs)
			return -ENOMEM;

		pgroups[type] = &sensor_groups[type].group;
		pdata->sensors_count += sensor_groups[type].attr_count;
		sensor_groups[type].attr_count = 0;
	}

	return 0;
}

static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
			      ssize_t (*show)(struct device *dev,
					      struct device_attribute *attr,
					      char *buf))
{
	snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
		 sensor_groups[sdata->type].name, sdata->hwmon_index,
		 attr_name);

	sysfs_attr_init(&sdata->dev_attr.attr);
	sdata->dev_attr.attr.name = sdata->name;
	sdata->dev_attr.attr.mode = S_IRUGO;
	sdata->dev_attr.show = show;
}

static void populate_sensor(struct sensor_data *sdata, int od, int hd, int sid,
			    const char *attr_name, enum sensors type,
			    const struct attribute_group *pgroup,
			    ssize_t (*show)(struct device *dev,
					    struct device_attribute *attr,
					    char *buf))
{
	sdata->id = sid;
	sdata->type = type;
	sdata->opal_index = od;
	sdata->hwmon_index = hd;
	create_hwmon_attr(sdata, attr_name, show);
	pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr;
}

static char *get_max_attr(enum sensors type)
{
	switch (type) {
	case POWER_INPUT:
		return "input_highest";
	default:
		return "highest";
	}
}

static char *get_min_attr(enum sensors type)
{
	switch (type) {
	case POWER_INPUT:
		return "input_lowest";
	default:
		return "lowest";
	}
}

/*
 * Iterate through the device tree for each child of 'sensors' node, create
 * a sysfs attribute file, the file is named by translating the DT node name
 * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
 * etc..
 */
static int create_device_attrs(struct platform_device *pdev)
{
	struct platform_data *pdata = platform_get_drvdata(pdev);
	const struct attribute_group **pgroups = pdata->attr_groups;
	struct device_node *opal, *np;
	struct sensor_data *sdata;
	u32 sensor_id;
	enum sensors type;
	u32 count = 0;
	int err = 0;

	opal = of_find_node_by_path("/ibm,opal/sensors");
	sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
			     GFP_KERNEL);
	if (!sdata) {
		err = -ENOMEM;
		goto exit_put_node;
	}

	for_each_child_of_node(opal, np) {
		const char *attr_name;
		u32 opal_index;
		const char *label;

		if (np->name == NULL)
			continue;

		type = get_sensor_type(np);
		if (type == MAX_SENSOR_TYPE)
			continue;

		/*
		 * Newer device trees use a "sensor-data" property
		 * name for input.
		 */
		if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
		    of_property_read_u32(np, "sensor-data", &sensor_id)) {
			dev_info(&pdev->dev,
				 "'sensor-id' missing in the node '%s'\n",
				 np->name);
			continue;
		}

		sdata[count].id = sensor_id;
		sdata[count].type = type;

		/*
		 * If we can not parse the node name, it means we are
		 * running on a newer device tree. We can just forget
		 * about the OPAL index and use a defaut value for the
		 * hwmon attribute name
		 */
		attr_name = parse_opal_node_name(np->name, type, &opal_index);
		if (IS_ERR(attr_name)) {
			attr_name = "input";
			opal_index = INVALID_INDEX;
		}

		sdata[count].opal_index = opal_index;
		sdata[count].hwmon_index =
			get_sensor_hwmon_index(&sdata[count], sdata, count);

		create_hwmon_attr(&sdata[count], attr_name, show_sensor);

		pgroups[type]->attrs[sensor_groups[type].attr_count++] =
				&sdata[count++].dev_attr.attr;

		if (!of_property_read_string(np, "label", &label)) {
			/*
			 * For the label attribute, we can reuse the
			 * "properties" of the previous "input"
			 * attribute. They are related to the same
			 * sensor.
			 */

			make_sensor_label(np, &sdata[count], label);
			populate_sensor(&sdata[count], opal_index,
					sdata[count - 1].hwmon_index,
					sensor_id, "label", type, pgroups[type],
					show_label);
			count++;
		}

		if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
			attr_name = get_max_attr(type);
			populate_sensor(&sdata[count], opal_index,
					sdata[count - 1].hwmon_index,
					sensor_id, attr_name, type,
					pgroups[type], show_sensor);
			count++;
		}

		if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
			attr_name = get_min_attr(type);
			populate_sensor(&sdata[count], opal_index,
					sdata[count - 1].hwmon_index,
					sensor_id, attr_name, type,
					pgroups[type], show_sensor);
			count++;
		}
	}

exit_put_node:
	of_node_put(opal);
	return err;
}

static int ibmpowernv_probe(struct platform_device *pdev)
{
	struct platform_data *pdata;
	struct device *hwmon_dev;
	int err;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	platform_set_drvdata(pdev, pdata);
	pdata->sensors_count = 0;
	err = populate_attr_groups(pdev);
	if (err)
		return err;

	/* Create sysfs attribute data for each sensor found in the DT */
	err = create_device_attrs(pdev);
	if (err)
		return err;

	/* Finally, register with hwmon */
	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
							   pdata,
							   pdata->attr_groups);

	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct platform_device_id opal_sensor_driver_ids[] = {
	{
		.name = "opal-sensor",
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);

static const struct of_device_id opal_sensor_match[] = {
	{ .compatible	= "ibm,opal-sensor" },
	{ },
};
MODULE_DEVICE_TABLE(of, opal_sensor_match);

static struct platform_driver ibmpowernv_driver = {
	.probe		= ibmpowernv_probe,
	.id_table	= opal_sensor_driver_ids,
	.driver		= {
		.name	= DRVNAME,
		.of_match_table	= opal_sensor_match,
	},
};

module_platform_driver(ibmpowernv_driver);

MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("IBM POWERNV platform sensors");
MODULE_LICENSE("GPL");