xref: /openbmc/linux/drivers/hwmon/ibmpex.c (revision e23feb16)
1 /*
2  * A hwmon driver for the IBM PowerExecutive temperature/power sensors
3  * Copyright (C) 2007 IBM
4  *
5  * Author: Darrick J. Wong <darrick.wong@oracle.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 
22 #include <linux/ipmi.h>
23 #include <linux/module.h>
24 #include <linux/hwmon.h>
25 #include <linux/hwmon-sysfs.h>
26 #include <linux/jiffies.h>
27 #include <linux/mutex.h>
28 #include <linux/slab.h>
29 #include <linux/err.h>
30 
31 #define REFRESH_INTERVAL	(2 * HZ)
32 #define DRVNAME			"ibmpex"
33 
34 #define PEX_GET_VERSION		1
35 #define PEX_GET_SENSOR_COUNT	2
36 #define PEX_GET_SENSOR_NAME	3
37 #define PEX_RESET_HIGH_LOW	4
38 #define PEX_GET_SENSOR_DATA	6
39 
40 #define PEX_NET_FUNCTION	0x3A
41 #define PEX_COMMAND		0x3C
42 
43 static inline u16 extract_value(const char *data, int offset)
44 {
45 	return be16_to_cpup((__be16 *)&data[offset]);
46 }
47 
48 #define TEMP_SENSOR		1
49 #define POWER_SENSOR		2
50 
51 #define PEX_SENSOR_TYPE_LEN	3
52 static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
53 static u8 const temp_sensor_sig[]  = {0x74, 0x65, 0x6D};
54 
55 #define PEX_MULT_LEN		2
56 static u8 const watt_sensor_sig[]  = {0x41, 0x43};
57 
58 #define PEX_NUM_SENSOR_FUNCS	3
59 static char const * const power_sensor_name_templates[] = {
60 	"%s%d_average",
61 	"%s%d_average_lowest",
62 	"%s%d_average_highest"
63 };
64 static char const * const temp_sensor_name_templates[] = {
65 	"%s%d_input",
66 	"%s%d_input_lowest",
67 	"%s%d_input_highest"
68 };
69 
70 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
71 static void ibmpex_register_bmc(int iface, struct device *dev);
72 static void ibmpex_bmc_gone(int iface);
73 
74 struct ibmpex_sensor_data {
75 	int			in_use;
76 	s16			values[PEX_NUM_SENSOR_FUNCS];
77 	int			multiplier;
78 
79 	struct sensor_device_attribute_2	attr[PEX_NUM_SENSOR_FUNCS];
80 };
81 
82 struct ibmpex_bmc_data {
83 	struct list_head	list;
84 	struct device		*hwmon_dev;
85 	struct device		*bmc_device;
86 	struct mutex		lock;
87 	char			valid;
88 	unsigned long		last_updated;	/* In jiffies */
89 
90 	struct ipmi_addr	address;
91 	struct completion	read_complete;
92 	ipmi_user_t		user;
93 	int			interface;
94 
95 	struct kernel_ipmi_msg	tx_message;
96 	unsigned char		tx_msg_data[IPMI_MAX_MSG_LENGTH];
97 	long			tx_msgid;
98 
99 	unsigned char		rx_msg_data[IPMI_MAX_MSG_LENGTH];
100 	unsigned long		rx_msg_len;
101 	unsigned char		rx_result;
102 	int			rx_recv_type;
103 
104 	unsigned char		sensor_major;
105 	unsigned char		sensor_minor;
106 
107 	unsigned char		num_sensors;
108 	struct ibmpex_sensor_data	*sensors;
109 };
110 
111 struct ibmpex_driver_data {
112 	struct list_head	bmc_data;
113 	struct ipmi_smi_watcher	bmc_events;
114 	struct ipmi_user_hndl	ipmi_hndlrs;
115 };
116 
117 static struct ibmpex_driver_data driver_data = {
118 	.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
119 	.bmc_events = {
120 		.owner = THIS_MODULE,
121 		.new_smi = ibmpex_register_bmc,
122 		.smi_gone = ibmpex_bmc_gone,
123 	},
124 	.ipmi_hndlrs = {
125 		.ipmi_recv_hndl = ibmpex_msg_handler,
126 	},
127 };
128 
129 static int ibmpex_send_message(struct ibmpex_bmc_data *data)
130 {
131 	int err;
132 
133 	err = ipmi_validate_addr(&data->address, sizeof(data->address));
134 	if (err)
135 		goto out;
136 
137 	data->tx_msgid++;
138 	err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
139 				   &data->tx_message, data, 0, 0, 0);
140 	if (err)
141 		goto out1;
142 
143 	return 0;
144 out1:
145 	dev_err(data->bmc_device, "request_settime=%x\n", err);
146 	return err;
147 out:
148 	dev_err(data->bmc_device, "validate_addr=%x\n", err);
149 	return err;
150 }
151 
152 static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
153 {
154 	data->tx_msg_data[0] = PEX_GET_VERSION;
155 	data->tx_message.data_len = 1;
156 	ibmpex_send_message(data);
157 
158 	wait_for_completion(&data->read_complete);
159 
160 	if (data->rx_result || data->rx_msg_len != 6)
161 		return -ENOENT;
162 
163 	data->sensor_major = data->rx_msg_data[0];
164 	data->sensor_minor = data->rx_msg_data[1];
165 
166 	dev_info(data->bmc_device,
167 		 "Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
168 		 data->sensor_major,
169 		 data->sensor_minor,
170 		 extract_value(data->rx_msg_data, 2),
171 		 data->rx_msg_data[4],
172 		 data->rx_msg_data[5],
173 		 data->interface);
174 
175 	return 0;
176 }
177 
178 static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
179 {
180 	data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
181 	data->tx_message.data_len = 1;
182 	ibmpex_send_message(data);
183 
184 	wait_for_completion(&data->read_complete);
185 
186 	if (data->rx_result || data->rx_msg_len != 1)
187 		return -ENOENT;
188 
189 	return data->rx_msg_data[0];
190 }
191 
192 static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
193 {
194 	data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
195 	data->tx_msg_data[1] = sensor;
196 	data->tx_message.data_len = 2;
197 	ibmpex_send_message(data);
198 
199 	wait_for_completion(&data->read_complete);
200 
201 	if (data->rx_result || data->rx_msg_len < 1)
202 		return -ENOENT;
203 
204 	return 0;
205 }
206 
207 static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
208 {
209 	data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
210 	data->tx_msg_data[1] = sensor;
211 	data->tx_message.data_len = 2;
212 	ibmpex_send_message(data);
213 
214 	wait_for_completion(&data->read_complete);
215 
216 	if (data->rx_result || data->rx_msg_len < 26) {
217 		dev_err(data->bmc_device, "Error reading sensor %d.\n",
218 			sensor);
219 		return -ENOENT;
220 	}
221 
222 	return 0;
223 }
224 
225 static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
226 {
227 	data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
228 	data->tx_message.data_len = 1;
229 	ibmpex_send_message(data);
230 
231 	wait_for_completion(&data->read_complete);
232 
233 	return 0;
234 }
235 
236 static void ibmpex_update_device(struct ibmpex_bmc_data *data)
237 {
238 	int i, err;
239 
240 	mutex_lock(&data->lock);
241 	if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
242 	    data->valid)
243 		goto out;
244 
245 	for (i = 0; i < data->num_sensors; i++) {
246 		if (!data->sensors[i].in_use)
247 			continue;
248 		err = ibmpex_query_sensor_data(data, i);
249 		if (err)
250 			continue;
251 		data->sensors[i].values[0] =
252 			extract_value(data->rx_msg_data, 16);
253 		data->sensors[i].values[1] =
254 			extract_value(data->rx_msg_data, 18);
255 		data->sensors[i].values[2] =
256 			extract_value(data->rx_msg_data, 20);
257 	}
258 
259 	data->last_updated = jiffies;
260 	data->valid = 1;
261 
262 out:
263 	mutex_unlock(&data->lock);
264 }
265 
266 static struct ibmpex_bmc_data *get_bmc_data(int iface)
267 {
268 	struct ibmpex_bmc_data *p, *next;
269 
270 	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
271 		if (p->interface == iface)
272 			return p;
273 
274 	return NULL;
275 }
276 
277 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
278 			 char *buf)
279 {
280 	return sprintf(buf, "%s\n", DRVNAME);
281 }
282 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
283 
284 static ssize_t ibmpex_show_sensor(struct device *dev,
285 				  struct device_attribute *devattr,
286 				  char *buf)
287 {
288 	struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
289 	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
290 	int mult = data->sensors[attr->index].multiplier;
291 	ibmpex_update_device(data);
292 
293 	return sprintf(buf, "%d\n",
294 		       data->sensors[attr->index].values[attr->nr] * mult);
295 }
296 
297 static ssize_t ibmpex_reset_high_low(struct device *dev,
298 				     struct device_attribute *devattr,
299 				     const char *buf,
300 				     size_t count)
301 {
302 	struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
303 
304 	ibmpex_reset_high_low_data(data);
305 
306 	return count;
307 }
308 
309 static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
310 			  ibmpex_reset_high_low, 0);
311 
312 static int is_power_sensor(const char *sensor_id, int len)
313 {
314 	if (len < PEX_SENSOR_TYPE_LEN)
315 		return 0;
316 
317 	if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
318 		return 1;
319 	return 0;
320 }
321 
322 static int is_temp_sensor(const char *sensor_id, int len)
323 {
324 	if (len < PEX_SENSOR_TYPE_LEN)
325 		return 0;
326 
327 	if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
328 		return 1;
329 	return 0;
330 }
331 
332 static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
333 				   const char *sensor_id, int len)
334 {
335 	int i;
336 
337 	if (data->sensor_major == 2)
338 		return 1000000;
339 
340 	for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
341 		if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
342 			return 1000000;
343 
344 	return 100000;
345 }
346 
347 static int create_sensor(struct ibmpex_bmc_data *data, int type,
348 			 int counter, int sensor, int func)
349 {
350 	int err;
351 	char *n;
352 
353 	n = kmalloc(32, GFP_KERNEL);
354 	if (!n)
355 		return -ENOMEM;
356 
357 	if (type == TEMP_SENSOR)
358 		sprintf(n, temp_sensor_name_templates[func], "temp", counter);
359 	else if (type == POWER_SENSOR)
360 		sprintf(n, power_sensor_name_templates[func], "power", counter);
361 
362 	sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
363 	data->sensors[sensor].attr[func].dev_attr.attr.name = n;
364 	data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
365 	data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
366 	data->sensors[sensor].attr[func].index = sensor;
367 	data->sensors[sensor].attr[func].nr = func;
368 
369 	err = device_create_file(data->bmc_device,
370 				 &data->sensors[sensor].attr[func].dev_attr);
371 	if (err) {
372 		data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
373 		kfree(n);
374 		return err;
375 	}
376 
377 	return 0;
378 }
379 
380 static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
381 {
382 	int i, j, err;
383 	int sensor_type;
384 	int sensor_counter;
385 	int num_power = 0;
386 	int num_temp = 0;
387 
388 	err = ibmpex_query_sensor_count(data);
389 	if (err <= 0)
390 		return -ENOENT;
391 	data->num_sensors = err;
392 
393 	data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
394 				GFP_KERNEL);
395 	if (!data->sensors)
396 		return -ENOMEM;
397 
398 	for (i = 0; i < data->num_sensors; i++) {
399 		err = ibmpex_query_sensor_name(data, i);
400 		if (err)
401 			continue;
402 
403 		if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
404 			sensor_type = POWER_SENSOR;
405 			num_power++;
406 			sensor_counter = num_power;
407 			data->sensors[i].multiplier =
408 				power_sensor_multiplier(data,
409 							data->rx_msg_data,
410 							data->rx_msg_len);
411 		} else if (is_temp_sensor(data->rx_msg_data,
412 					  data->rx_msg_len)) {
413 			sensor_type = TEMP_SENSOR;
414 			num_temp++;
415 			sensor_counter = num_temp;
416 			data->sensors[i].multiplier = 1000;
417 		} else
418 			continue;
419 
420 		data->sensors[i].in_use = 1;
421 
422 		/* Create attributes */
423 		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
424 			err = create_sensor(data, sensor_type, sensor_counter,
425 					    i, j);
426 			if (err)
427 				goto exit_remove;
428 		}
429 	}
430 
431 	err = device_create_file(data->bmc_device,
432 			&sensor_dev_attr_reset_high_low.dev_attr);
433 	if (err)
434 		goto exit_remove;
435 
436 	err = device_create_file(data->bmc_device,
437 			&sensor_dev_attr_name.dev_attr);
438 	if (err)
439 		goto exit_remove;
440 
441 	return 0;
442 
443 exit_remove:
444 	device_remove_file(data->bmc_device,
445 			   &sensor_dev_attr_reset_high_low.dev_attr);
446 	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
447 	for (i = 0; i < data->num_sensors; i++)
448 		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
449 			if (!data->sensors[i].attr[j].dev_attr.attr.name)
450 				continue;
451 			device_remove_file(data->bmc_device,
452 				&data->sensors[i].attr[j].dev_attr);
453 			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
454 		}
455 
456 	kfree(data->sensors);
457 	return err;
458 }
459 
460 static void ibmpex_register_bmc(int iface, struct device *dev)
461 {
462 	struct ibmpex_bmc_data *data;
463 	int err;
464 
465 	data = kzalloc(sizeof(*data), GFP_KERNEL);
466 	if (!data) {
467 		dev_err(dev, "Insufficient memory for BMC interface.\n");
468 		return;
469 	}
470 
471 	data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
472 	data->address.channel = IPMI_BMC_CHANNEL;
473 	data->address.data[0] = 0;
474 	data->interface = iface;
475 	data->bmc_device = dev;
476 
477 	/* Create IPMI messaging interface user */
478 	err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
479 			       data, &data->user);
480 	if (err < 0) {
481 		dev_err(dev,
482 			"Unable to register user with IPMI interface %d\n",
483 			data->interface);
484 		goto out;
485 	}
486 
487 	mutex_init(&data->lock);
488 
489 	/* Initialize message */
490 	data->tx_msgid = 0;
491 	init_completion(&data->read_complete);
492 	data->tx_message.netfn = PEX_NET_FUNCTION;
493 	data->tx_message.cmd = PEX_COMMAND;
494 	data->tx_message.data = data->tx_msg_data;
495 
496 	/* Does this BMC support PowerExecutive? */
497 	err = ibmpex_ver_check(data);
498 	if (err)
499 		goto out_user;
500 
501 	/* Register the BMC as a HWMON class device */
502 	data->hwmon_dev = hwmon_device_register(data->bmc_device);
503 
504 	if (IS_ERR(data->hwmon_dev)) {
505 		dev_err(data->bmc_device,
506 			"Unable to register hwmon device for IPMI interface %d\n",
507 			data->interface);
508 		goto out_user;
509 	}
510 
511 	/* finally add the new bmc data to the bmc data list */
512 	dev_set_drvdata(dev, data);
513 	list_add_tail(&data->list, &driver_data.bmc_data);
514 
515 	/* Now go find all the sensors */
516 	err = ibmpex_find_sensors(data);
517 	if (err) {
518 		dev_err(data->bmc_device, "Error %d finding sensors\n", err);
519 		goto out_register;
520 	}
521 
522 	return;
523 
524 out_register:
525 	hwmon_device_unregister(data->hwmon_dev);
526 out_user:
527 	ipmi_destroy_user(data->user);
528 out:
529 	kfree(data);
530 }
531 
532 static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
533 {
534 	int i, j;
535 
536 	device_remove_file(data->bmc_device,
537 			   &sensor_dev_attr_reset_high_low.dev_attr);
538 	device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
539 	for (i = 0; i < data->num_sensors; i++)
540 		for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
541 			if (!data->sensors[i].attr[j].dev_attr.attr.name)
542 				continue;
543 			device_remove_file(data->bmc_device,
544 				&data->sensors[i].attr[j].dev_attr);
545 			kfree(data->sensors[i].attr[j].dev_attr.attr.name);
546 		}
547 
548 	list_del(&data->list);
549 	dev_set_drvdata(data->bmc_device, NULL);
550 	hwmon_device_unregister(data->hwmon_dev);
551 	ipmi_destroy_user(data->user);
552 	kfree(data->sensors);
553 	kfree(data);
554 }
555 
556 static void ibmpex_bmc_gone(int iface)
557 {
558 	struct ibmpex_bmc_data *data = get_bmc_data(iface);
559 
560 	if (!data)
561 		return;
562 
563 	ibmpex_bmc_delete(data);
564 }
565 
566 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
567 {
568 	struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;
569 
570 	if (msg->msgid != data->tx_msgid) {
571 		dev_err(data->bmc_device,
572 			"Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
573 			(int)msg->msgid,
574 			(int)data->tx_msgid);
575 		ipmi_free_recv_msg(msg);
576 		return;
577 	}
578 
579 	data->rx_recv_type = msg->recv_type;
580 	if (msg->msg.data_len > 0)
581 		data->rx_result = msg->msg.data[0];
582 	else
583 		data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
584 
585 	if (msg->msg.data_len > 1) {
586 		data->rx_msg_len = msg->msg.data_len - 1;
587 		memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
588 	} else
589 		data->rx_msg_len = 0;
590 
591 	ipmi_free_recv_msg(msg);
592 	complete(&data->read_complete);
593 }
594 
595 static int __init ibmpex_init(void)
596 {
597 	return ipmi_smi_watcher_register(&driver_data.bmc_events);
598 }
599 
600 static void __exit ibmpex_exit(void)
601 {
602 	struct ibmpex_bmc_data *p, *next;
603 
604 	ipmi_smi_watcher_unregister(&driver_data.bmc_events);
605 	list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
606 		ibmpex_bmc_delete(p);
607 }
608 
609 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
610 MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
611 MODULE_LICENSE("GPL");
612 
613 module_init(ibmpex_init);
614 module_exit(ibmpex_exit);
615 
616 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
617 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
618 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
619 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
620 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
621