summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/ibmpex.c
blob: 41dbf8161ed7b4fb1bc29811c61f006152c9a41c (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
/*
 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
 * Copyright (C) 2007 IBM
 *
 * Author: Darrick J. Wong <djwong@us.ibm.com>
 *
 * 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/ipmi.h>
#include <linux/module.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#define REFRESH_INTERVAL	(2 * HZ)
#define DRVNAME			"ibmpex"

#define PEX_GET_VERSION		1
#define PEX_GET_SENSOR_COUNT	2
#define PEX_GET_SENSOR_NAME	3
#define PEX_RESET_HIGH_LOW	4
#define PEX_GET_SENSOR_DATA	6

#define PEX_NET_FUNCTION	0x3A
#define PEX_COMMAND		0x3C

static inline u16 extract_value(const char *data, int offset)
{
	return be16_to_cpup((__be16 *)&data[offset]);
}

#define TEMP_SENSOR		1
#define POWER_SENSOR		2

#define PEX_SENSOR_TYPE_LEN	3
static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
static u8 const temp_sensor_sig[]  = {0x74, 0x65, 0x6D};

#define PEX_MULT_LEN		2
static u8 const watt_sensor_sig[]  = {0x41, 0x43};

#define PEX_NUM_SENSOR_FUNCS	3
static char const * const power_sensor_name_templates[] = {
	"%s%d_average",
	"%s%d_average_lowest",
	"%s%d_average_highest"
};
static char const * const temp_sensor_name_templates[] = {
	"%s%d_input",
	"%s%d_input_lowest",
	"%s%d_input_highest"
};

static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
static void ibmpex_register_bmc(int iface, struct device *dev);
static void ibmpex_bmc_gone(int iface);

struct ibmpex_sensor_data {
	int			in_use;
	s16			values[PEX_NUM_SENSOR_FUNCS];
	int			multiplier;

	struct sensor_device_attribute_2	attr[PEX_NUM_SENSOR_FUNCS];
};

struct ibmpex_bmc_data {
	struct list_head	list;
	struct device		*hwmon_dev;
	struct device		*bmc_device;
	struct mutex		lock;
	char			valid;
	unsigned long		last_updated;	/* In jiffies */

	struct ipmi_addr	address;
	struct completion	read_complete;
	ipmi_user_t		user;
	int			interface;

	struct kernel_ipmi_msg	tx_message;
	unsigned char		tx_msg_data[IPMI_MAX_MSG_LENGTH];
	long			tx_msgid;

	unsigned char		rx_msg_data[IPMI_MAX_MSG_LENGTH];
	unsigned long		rx_msg_len;
	unsigned char		rx_result;
	int			rx_recv_type;

	unsigned char		sensor_major;
	unsigned char		sensor_minor;

	unsigned char		num_sensors;
	struct ibmpex_sensor_data	*sensors;
};

struct ibmpex_driver_data {
	struct list_head	bmc_data;
	struct ipmi_smi_watcher	bmc_events;
	struct ipmi_user_hndl	ipmi_hndlrs;
};

static struct ibmpex_driver_data driver_data = {
	.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
	.bmc_events = {
		.owner = THIS_MODULE,
		.new_smi = ibmpex_register_bmc,
		.smi_gone = ibmpex_bmc_gone,
	},
	.ipmi_hndlrs = {
		.ipmi_recv_hndl = ibmpex_msg_handler,
	},
};

static int ibmpex_send_message(struct ibmpex_bmc_data *data)
{
	int err;

	err = ipmi_validate_addr(&data->address, sizeof(data->address));
	if (err)
		goto out;

	data->tx_msgid++;
	err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
				   &data->tx_message, data, 0, 0, 0);
	if (err)
		goto out1;

	return 0;
out1:
	dev_err(data->bmc_device, "request_settime=%x\n", err);
	return err;
out:
	dev_err(data->bmc_device, "validate_addr=%x\n", err);
	return err;
}

static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_GET_VERSION;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len != 6)
		return -ENOENT;

	data->sensor_major = data->rx_msg_data[0];
	data->sensor_minor = data->rx_msg_data[1];

	dev_info(data->bmc_device, "Found BMC with sensor interface "
		 "v%d.%d %d-%02d-%02d on interface %d\n",
		 data->sensor_major,
		 data->sensor_minor,
		 extract_value(data->rx_msg_data, 2),
		 data->rx_msg_data[4],
		 data->rx_msg_data[5],
		 data->interface);

	return 0;
}

static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len != 1)
		return -ENOENT;

	return data->rx_msg_data[0];
}

static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
	data->tx_msg_data[1] = sensor;
	data->tx_message.data_len = 2;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len < 1)
		return -ENOENT;

	return 0;
}

static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
{
	data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
	data->tx_msg_data[1] = sensor;
	data->tx_message.data_len = 2;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	if (data->rx_result || data->rx_msg_len < 26) {
		dev_err(data->bmc_device, "Error reading sensor %d.\n",
			sensor);
		return -ENOENT;
	}

	return 0;
}

static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
{
	data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
	data->tx_message.data_len = 1;
	ibmpex_send_message(data);

	wait_for_completion(&data->read_complete);

	return 0;
}

static void ibmpex_update_device(struct ibmpex_bmc_data *data)
{
	int i, err;

	mutex_lock(&data->lock);
	if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
	    data->valid)
		goto out;

	for (i = 0; i < data->num_sensors; i++) {
		if (!data->sensors[i].in_use)
			continue;
		err = ibmpex_query_sensor_data(data, i);
		if (err)
			continue;
		data->sensors[i].values[0] =
			extract_value(data->rx_msg_data, 16);
		data->sensors[i].values[1] =
			extract_value(data->rx_msg_data, 18);
		data->sensors[i].values[2] =
			extract_value(data->rx_msg_data, 20);
	}

	data->last_updated = jiffies;
	data->valid = 1;

out:
	mutex_unlock(&data->lock);
}

static struct ibmpex_bmc_data *get_bmc_data(int iface)
{
	struct ibmpex_bmc_data *p, *next;

	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
		if (p->interface == iface)
			return p;

	return NULL;
}

static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	return sprintf(buf, "%s\n", DRVNAME);
}
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);

static ssize_t ibmpex_show_sensor(struct device *dev,
				  struct device_attribute *devattr,
				  char *buf)
{
	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
	int mult = data->sensors[attr->index].multiplier;
	ibmpex_update_device(data);

	return sprintf(buf, "%d\n",
		       data->sensors[attr->index].values[attr->nr] * mult);
}

static ssize_t ibmpex_reset_high_low(struct device *dev,
				     struct device_attribute *devattr,
				     const char *buf,
				     size_t count)
{
	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);

	ibmpex_reset_high_low_data(data);

	return count;
}

static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
			  ibmpex_reset_high_low, 0);

static int is_power_sensor(const char *sensor_id, int len)
{
	if (len < PEX_SENSOR_TYPE_LEN)
		return 0;

	if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
		return 1;
	return 0;
}

static int is_temp_sensor(const char *sensor_id, int len)
{
	if (len < PEX_SENSOR_TYPE_LEN)
		return 0;

	if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
		return 1;
	return 0;
}

static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
				   const char *sensor_id, int len)
{
	int i;

	if (data->sensor_major == 2)
		return 1000000;

	for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
		if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
			return 1000000;

	return 100000;
}

static int create_sensor(struct ibmpex_bmc_data *data, int type,
			 int counter, int sensor, int func)
{
	int err;
	char *n;

	n = kmalloc(32, GFP_KERNEL);
	if (!n)
		return -ENOMEM;

	if (type == TEMP_SENSOR)
		sprintf(n, temp_sensor_name_templates[func], "temp", counter);
	else if (type == POWER_SENSOR)
		sprintf(n, power_sensor_name_templates[func], "power", counter);

	sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
	data->sensors[sensor].attr[func].dev_attr.attr.name = n;
	data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
	data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
	data->sensors[sensor].attr[func].index = sensor;
	data->sensors[sensor].attr[func].nr = func;

	err = device_create_file(data->bmc_device,
				 &data->sensors[sensor].attr[func].dev_attr);
	if (err) {
		data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
		kfree(n);
		return err;
	}

	return 0;
}

static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
{
	int i, j, err;
	int sensor_type;
	int sensor_counter;
	int num_power = 0;
	int num_temp = 0;

	err = ibmpex_query_sensor_count(data);
	if (err <= 0)
		return -ENOENT;
	data->num_sensors = err;

	data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
				GFP_KERNEL);
	if (!data->sensors)
		return -ENOMEM;

	for (i = 0; i < data->num_sensors; i++) {
		err = ibmpex_query_sensor_name(data, i);
		if (err)
			continue;

		if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
			sensor_type = POWER_SENSOR;
			num_power++;
			sensor_counter = num_power;
			data->sensors[i].multiplier =
				power_sensor_multiplier(data,
							data->rx_msg_data,
							data->rx_msg_len);
		} else if (is_temp_sensor(data->rx_msg_data,
					  data->rx_msg_len)) {
			sensor_type = TEMP_SENSOR;
			num_temp++;
			sensor_counter = num_temp;
			data->sensors[i].multiplier = 1000;
		} else
			continue;

		data->sensors[i].in_use = 1;

		/* Create attributes */
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			err = create_sensor(data, sensor_type, sensor_counter,
					    i, j);
			if (err)
				goto exit_remove;
		}
	}

	err = device_create_file(data->bmc_device,
			&sensor_dev_attr_reset_high_low.dev_attr);
	if (err)
		goto exit_remove;

	err = device_create_file(data->bmc_device,
			&sensor_dev_attr_name.dev_attr);
	if (err)
		goto exit_remove;

	return 0;

exit_remove:
	device_remove_file(data->bmc_device,
			   &sensor_dev_attr_reset_high_low.dev_attr);
	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	for (i = 0; i < data->num_sensors; i++)
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			if (!data->sensors[i].attr[j].dev_attr.attr.name)
				continue;
			device_remove_file(data->bmc_device,
				&data->sensors[i].attr[j].dev_attr);
			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
		}

	kfree(data->sensors);
	return err;
}

static void ibmpex_register_bmc(int iface, struct device *dev)
{
	struct ibmpex_bmc_data *data;
	int err;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data) {
		dev_err(dev, "Insufficient memory for BMC interface.\n");
		return;
	}

	data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
	data->address.channel = IPMI_BMC_CHANNEL;
	data->address.data[0] = 0;
	data->interface = iface;
	data->bmc_device = dev;

	/* Create IPMI messaging interface user */
	err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
			       data, &data->user);
	if (err < 0) {
		dev_err(dev, "Unable to register user with IPMI "
			"interface %d\n", data->interface);
		goto out;
	}

	mutex_init(&data->lock);

	/* Initialize message */
	data->tx_msgid = 0;
	init_completion(&data->read_complete);
	data->tx_message.netfn = PEX_NET_FUNCTION;
	data->tx_message.cmd = PEX_COMMAND;
	data->tx_message.data = data->tx_msg_data;

	/* Does this BMC support PowerExecutive? */
	err = ibmpex_ver_check(data);
	if (err)
		goto out_user;

	/* Register the BMC as a HWMON class device */
	data->hwmon_dev = hwmon_device_register(data->bmc_device);

	if (IS_ERR(data->hwmon_dev)) {
		dev_err(data->bmc_device, "Unable to register hwmon "
			"device for IPMI interface %d\n",
			data->interface);
		goto out_user;
	}

	/* finally add the new bmc data to the bmc data list */
	dev_set_drvdata(dev, data);
	list_add_tail(&data->list, &driver_data.bmc_data);

	/* Now go find all the sensors */
	err = ibmpex_find_sensors(data);
	if (err) {
		dev_err(data->bmc_device, "Error %d finding sensors\n", err);
		goto out_register;
	}

	return;

out_register:
	hwmon_device_unregister(data->hwmon_dev);
out_user:
	ipmi_destroy_user(data->user);
out:
	kfree(data);
}

static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
{
	int i, j;

	device_remove_file(data->bmc_device,
			   &sensor_dev_attr_reset_high_low.dev_attr);
	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
	for (i = 0; i < data->num_sensors; i++)
		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
			if (!data->sensors[i].attr[j].dev_attr.attr.name)
				continue;
			device_remove_file(data->bmc_device,
				&data->sensors[i].attr[j].dev_attr);
			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
		}

	list_del(&data->list);
	dev_set_drvdata(data->bmc_device, NULL);
	hwmon_device_unregister(data->hwmon_dev);
	ipmi_destroy_user(data->user);
	kfree(data->sensors);
	kfree(data);
}

static void ibmpex_bmc_gone(int iface)
{
	struct ibmpex_bmc_data *data = get_bmc_data(iface);

	if (!data)
		return;

	ibmpex_bmc_delete(data);
}

static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
{
	struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;

	if (msg->msgid != data->tx_msgid) {
		dev_err(data->bmc_device, "Mismatch between received msgid "
			"(%02x) and transmitted msgid (%02x)!\n",
			(int)msg->msgid,
			(int)data->tx_msgid);
		ipmi_free_recv_msg(msg);
		return;
	}

	data->rx_recv_type = msg->recv_type;
	if (msg->msg.data_len > 0)
		data->rx_result = msg->msg.data[0];
	else
		data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;

	if (msg->msg.data_len > 1) {
		data->rx_msg_len = msg->msg.data_len - 1;
		memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
	} else
		data->rx_msg_len = 0;

	ipmi_free_recv_msg(msg);
	complete(&data->read_complete);
}

static int __init ibmpex_init(void)
{
	return ipmi_smi_watcher_register(&driver_data.bmc_events);
}

static void __exit ibmpex_exit(void)
{
	struct ibmpex_bmc_data *p, *next;

	ipmi_smi_watcher_unregister(&driver_data.bmc_events);
	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
		ibmpex_bmc_delete(p);
}

MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
MODULE_LICENSE("GPL");

module_init(ibmpex_init);
module_exit(ibmpex_exit);

MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");