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1/*
2 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
3 * Copyright (C) 2007 IBM
4 *
5 * Author: Darrick J. Wong <djwong@us.ibm.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
30#define REFRESH_INTERVAL (2 * HZ)
31#define DRVNAME "ibmpex"
32
33#define PEX_GET_VERSION 1
34#define PEX_GET_SENSOR_COUNT 2
35#define PEX_GET_SENSOR_NAME 3
36#define PEX_RESET_HIGH_LOW 4
37#define PEX_GET_SENSOR_DATA 6
38
39#define PEX_NET_FUNCTION 0x3A
40#define PEX_COMMAND 0x3C
41
42static inline u16 extract_value(const char *data, int offset)
43{
44 return be16_to_cpup((__be16 *)&data[offset]);
45}
46
47#define TEMP_SENSOR 1
48#define POWER_SENSOR 2
49
50#define PEX_SENSOR_TYPE_LEN 3
51static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
52static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
53
54#define PEX_MULT_LEN 2
55static u8 const watt_sensor_sig[] = {0x41, 0x43};
56
57#define PEX_NUM_SENSOR_FUNCS 3
58static char const * const power_sensor_name_templates[] = {
59 "%s%d_average",
60 "%s%d_average_lowest",
61 "%s%d_average_highest"
62};
63static char const * const temp_sensor_name_templates[] = {
64 "%s%d_input",
65 "%s%d_input_lowest",
66 "%s%d_input_highest"
67};
68
69static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
70static void ibmpex_register_bmc(int iface, struct device *dev);
71static void ibmpex_bmc_gone(int iface);
72
73struct ibmpex_sensor_data {
74 int in_use;
75 s16 values[PEX_NUM_SENSOR_FUNCS];
76 int multiplier;
77
78 struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
79};
80
81struct ibmpex_bmc_data {
82 struct list_head list;
83 struct device *hwmon_dev;
84 struct device *bmc_device;
85 struct mutex lock;
86 char valid;
87 unsigned long last_updated; /* In jiffies */
88
89 struct ipmi_addr address;
90 struct completion read_complete;
91 ipmi_user_t user;
92 int interface;
93
94 struct kernel_ipmi_msg tx_message;
95 unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
96 long tx_msgid;
97
98 unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
99 unsigned long rx_msg_len;
100 unsigned char rx_result;
101 int rx_recv_type;
102
103 unsigned char sensor_major;
104 unsigned char sensor_minor;
105
106 unsigned char num_sensors;
107 struct ibmpex_sensor_data *sensors;
108};
109
110struct ibmpex_driver_data {
111 struct list_head bmc_data;
112 struct ipmi_smi_watcher bmc_events;
113 struct ipmi_user_hndl ipmi_hndlrs;
114};
115
116static struct ibmpex_driver_data driver_data = {
117 .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
118 .bmc_events = {
119 .owner = THIS_MODULE,
120 .new_smi = ibmpex_register_bmc,
121 .smi_gone = ibmpex_bmc_gone,
122 },
123 .ipmi_hndlrs = {
124 .ipmi_recv_hndl = ibmpex_msg_handler,
125 },
126};
127
128static int ibmpex_send_message(struct ibmpex_bmc_data *data)
129{
130 int err;
131
132 err = ipmi_validate_addr(&data->address, sizeof(data->address));
133 if (err)
134 goto out;
135
136 data->tx_msgid++;
137 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
138 &data->tx_message, data, 0, 0, 0);
139 if (err)
140 goto out1;
141
142 return 0;
143out1:
144 dev_err(data->bmc_device, "request_settime=%x\n", err);
145 return err;
146out:
147 dev_err(data->bmc_device, "validate_addr=%x\n", err);
148 return err;
149}
150
151static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
152{
153 data->tx_msg_data[0] = PEX_GET_VERSION;
154 data->tx_message.data_len = 1;
155 ibmpex_send_message(data);
156
157 wait_for_completion(&data->read_complete);
158
159 if (data->rx_result || data->rx_msg_len != 6)
160 return -ENOENT;
161
162 data->sensor_major = data->rx_msg_data[0];
163 data->sensor_minor = data->rx_msg_data[1];
164
165 dev_info(data->bmc_device, "Found BMC with sensor interface "
166 "v%d.%d %d-%02d-%02d on interface %d\n",
167 data->sensor_major,
168 data->sensor_minor,
169 extract_value(data->rx_msg_data, 2),
170 data->rx_msg_data[4],
171 data->rx_msg_data[5],
172 data->interface);
173
174 return 0;
175}
176
177static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
178{
179 data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
180 data->tx_message.data_len = 1;
181 ibmpex_send_message(data);
182
183 wait_for_completion(&data->read_complete);
184
185 if (data->rx_result || data->rx_msg_len != 1)
186 return -ENOENT;
187
188 return data->rx_msg_data[0];
189}
190
191static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
192{
193 data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
194 data->tx_msg_data[1] = sensor;
195 data->tx_message.data_len = 2;
196 ibmpex_send_message(data);
197
198 wait_for_completion(&data->read_complete);
199
200 if (data->rx_result || data->rx_msg_len < 1)
201 return -ENOENT;
202
203 return 0;
204}
205
206static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
207{
208 data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
209 data->tx_msg_data[1] = sensor;
210 data->tx_message.data_len = 2;
211 ibmpex_send_message(data);
212
213 wait_for_completion(&data->read_complete);
214
215 if (data->rx_result || data->rx_msg_len < 26) {
216 dev_err(data->bmc_device, "Error reading sensor %d.\n",
217 sensor);
218 return -ENOENT;
219 }
220
221 return 0;
222}
223
224static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
225{
226 data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
227 data->tx_message.data_len = 1;
228 ibmpex_send_message(data);
229
230 wait_for_completion(&data->read_complete);
231
232 return 0;
233}
234
235static void ibmpex_update_device(struct ibmpex_bmc_data *data)
236{
237 int i, err;
238
239 mutex_lock(&data->lock);
240 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
241 data->valid)
242 goto out;
243
244 for (i = 0; i < data->num_sensors; i++) {
245 if (!data->sensors[i].in_use)
246 continue;
247 err = ibmpex_query_sensor_data(data, i);
248 if (err)
249 continue;
250 data->sensors[i].values[0] =
251 extract_value(data->rx_msg_data, 16);
252 data->sensors[i].values[1] =
253 extract_value(data->rx_msg_data, 18);
254 data->sensors[i].values[2] =
255 extract_value(data->rx_msg_data, 20);
256 }
257
258 data->last_updated = jiffies;
259 data->valid = 1;
260
261out:
262 mutex_unlock(&data->lock);
263}
264
265static struct ibmpex_bmc_data *get_bmc_data(int iface)
266{
267 struct ibmpex_bmc_data *p, *next;
268
269 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
270 if (p->interface == iface)
271 return p;
272
273 return NULL;
274}
275
276static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
277 char *buf)
278{
279 return sprintf(buf, "%s\n", DRVNAME);
280}
281static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
282
283static ssize_t ibmpex_show_sensor(struct device *dev,
284 struct device_attribute *devattr,
285 char *buf)
286{
287 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
288 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
289 int mult = data->sensors[attr->index].multiplier;
290 ibmpex_update_device(data);
291
292 return sprintf(buf, "%d\n",
293 data->sensors[attr->index].values[attr->nr] * mult);
294}
295
296static ssize_t ibmpex_reset_high_low(struct device *dev,
297 struct device_attribute *devattr,
298 const char *buf,
299 size_t count)
300{
301 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
302
303 ibmpex_reset_high_low_data(data);
304
305 return count;
306}
307
308static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
309 ibmpex_reset_high_low, 0);
310
311static int is_power_sensor(const char *sensor_id, int len)
312{
313 if (len < PEX_SENSOR_TYPE_LEN)
314 return 0;
315
316 if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
317 return 1;
318 return 0;
319}
320
321static int is_temp_sensor(const char *sensor_id, int len)
322{
323 if (len < PEX_SENSOR_TYPE_LEN)
324 return 0;
325
326 if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
327 return 1;
328 return 0;
329}
330
331static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
332 const char *sensor_id, int len)
333{
334 int i;
335
336 if (data->sensor_major == 2)
337 return 1000000;
338
339 for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
340 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
341 return 1000000;
342
343 return 100000;
344}
345
346static int create_sensor(struct ibmpex_bmc_data *data, int type,
347 int counter, int sensor, int func)
348{
349 int err;
350 char *n;
351
352 n = kmalloc(32, GFP_KERNEL);
353 if (!n)
354 return -ENOMEM;
355
356 if (type == TEMP_SENSOR)
357 sprintf(n, temp_sensor_name_templates[func], "temp", counter);
358 else if (type == POWER_SENSOR)
359 sprintf(n, power_sensor_name_templates[func], "power", counter);
360
361 sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
362 data->sensors[sensor].attr[func].dev_attr.attr.name = n;
363 data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
364 data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
365 data->sensors[sensor].attr[func].index = sensor;
366 data->sensors[sensor].attr[func].nr = func;
367
368 err = device_create_file(data->bmc_device,
369 &data->sensors[sensor].attr[func].dev_attr);
370 if (err) {
371 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
372 kfree(n);
373 return err;
374 }
375
376 return 0;
377}
378
379static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
380{
381 int i, j, err;
382 int sensor_type;
383 int sensor_counter;
384 int num_power = 0;
385 int num_temp = 0;
386
387 err = ibmpex_query_sensor_count(data);
388 if (err <= 0)
389 return -ENOENT;
390 data->num_sensors = err;
391
392 data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
393 GFP_KERNEL);
394 if (!data->sensors)
395 return -ENOMEM;
396
397 for (i = 0; i < data->num_sensors; i++) {
398 err = ibmpex_query_sensor_name(data, i);
399 if (err)
400 continue;
401
402 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
403 sensor_type = POWER_SENSOR;
404 num_power++;
405 sensor_counter = num_power;
406 data->sensors[i].multiplier =
407 power_sensor_multiplier(data,
408 data->rx_msg_data,
409 data->rx_msg_len);
410 } else if (is_temp_sensor(data->rx_msg_data,
411 data->rx_msg_len)) {
412 sensor_type = TEMP_SENSOR;
413 num_temp++;
414 sensor_counter = num_temp;
415 data->sensors[i].multiplier = 1000;
416 } else
417 continue;
418
419 data->sensors[i].in_use = 1;
420
421 /* Create attributes */
422 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
423 err = create_sensor(data, sensor_type, sensor_counter,
424 i, j);
425 if (err)
426 goto exit_remove;
427 }
428 }
429
430 err = device_create_file(data->bmc_device,
431 &sensor_dev_attr_reset_high_low.dev_attr);
432 if (err)
433 goto exit_remove;
434
435 err = device_create_file(data->bmc_device,
436 &sensor_dev_attr_name.dev_attr);
437 if (err)
438 goto exit_remove;
439
440 return 0;
441
442exit_remove:
443 device_remove_file(data->bmc_device,
444 &sensor_dev_attr_reset_high_low.dev_attr);
445 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
446 for (i = 0; i < data->num_sensors; i++)
447 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
448 if (!data->sensors[i].attr[j].dev_attr.attr.name)
449 continue;
450 device_remove_file(data->bmc_device,
451 &data->sensors[i].attr[j].dev_attr);
452 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
453 }
454
455 kfree(data->sensors);
456 return err;
457}
458
459static void ibmpex_register_bmc(int iface, struct device *dev)
460{
461 struct ibmpex_bmc_data *data;
462 int err;
463
464 data = kzalloc(sizeof(*data), GFP_KERNEL);
465 if (!data) {
466 dev_err(dev, "Insufficient memory for BMC interface.\n");
467 return;
468 }
469
470 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
471 data->address.channel = IPMI_BMC_CHANNEL;
472 data->address.data[0] = 0;
473 data->interface = iface;
474 data->bmc_device = dev;
475
476 /* Create IPMI messaging interface user */
477 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
478 data, &data->user);
479 if (err < 0) {
480 dev_err(dev, "Unable to register user with IPMI "
481 "interface %d\n", data->interface);
482 goto out;
483 }
484
485 mutex_init(&data->lock);
486
487 /* Initialize message */
488 data->tx_msgid = 0;
489 init_completion(&data->read_complete);
490 data->tx_message.netfn = PEX_NET_FUNCTION;
491 data->tx_message.cmd = PEX_COMMAND;
492 data->tx_message.data = data->tx_msg_data;
493
494 /* Does this BMC support PowerExecutive? */
495 err = ibmpex_ver_check(data);
496 if (err)
497 goto out_user;
498
499 /* Register the BMC as a HWMON class device */
500 data->hwmon_dev = hwmon_device_register(data->bmc_device);
501
502 if (IS_ERR(data->hwmon_dev)) {
503 dev_err(data->bmc_device, "Unable to register hwmon "
504 "device for IPMI interface %d\n",
505 data->interface);
506 goto out_user;
507 }
508
509 /* finally add the new bmc data to the bmc data list */
510 dev_set_drvdata(dev, data);
511 list_add_tail(&data->list, &driver_data.bmc_data);
512
513 /* Now go find all the sensors */
514 err = ibmpex_find_sensors(data);
515 if (err) {
516 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
517 goto out_register;
518 }
519
520 return;
521
522out_register:
523 hwmon_device_unregister(data->hwmon_dev);
524out_user:
525 ipmi_destroy_user(data->user);
526out:
527 kfree(data);
528}
529
530static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
531{
532 int i, j;
533
534 device_remove_file(data->bmc_device,
535 &sensor_dev_attr_reset_high_low.dev_attr);
536 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
537 for (i = 0; i < data->num_sensors; i++)
538 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
539 if (!data->sensors[i].attr[j].dev_attr.attr.name)
540 continue;
541 device_remove_file(data->bmc_device,
542 &data->sensors[i].attr[j].dev_attr);
543 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
544 }
545
546 list_del(&data->list);
547 dev_set_drvdata(data->bmc_device, NULL);
548 hwmon_device_unregister(data->hwmon_dev);
549 ipmi_destroy_user(data->user);
550 kfree(data->sensors);
551 kfree(data);
552}
553
554static void ibmpex_bmc_gone(int iface)
555{
556 struct ibmpex_bmc_data *data = get_bmc_data(iface);
557
558 if (!data)
559 return;
560
561 ibmpex_bmc_delete(data);
562}
563
564static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
565{
566 struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;
567
568 if (msg->msgid != data->tx_msgid) {
569 dev_err(data->bmc_device, "Mismatch between received msgid "
570 "(%02x) and transmitted msgid (%02x)!\n",
571 (int)msg->msgid,
572 (int)data->tx_msgid);
573 ipmi_free_recv_msg(msg);
574 return;
575 }
576
577 data->rx_recv_type = msg->recv_type;
578 if (msg->msg.data_len > 0)
579 data->rx_result = msg->msg.data[0];
580 else
581 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
582
583 if (msg->msg.data_len > 1) {
584 data->rx_msg_len = msg->msg.data_len - 1;
585 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
586 } else
587 data->rx_msg_len = 0;
588
589 ipmi_free_recv_msg(msg);
590 complete(&data->read_complete);
591}
592
593static int __init ibmpex_init(void)
594{
595 return ipmi_smi_watcher_register(&driver_data.bmc_events);
596}
597
598static void __exit ibmpex_exit(void)
599{
600 struct ibmpex_bmc_data *p, *next;
601
602 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
603 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
604 ibmpex_bmc_delete(p);
605}
606
607MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
608MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
609MODULE_LICENSE("GPL");
610
611module_init(ibmpex_init);
612module_exit(ibmpex_exit);
613
614MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
615MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
616MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
617MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
618MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
4 * Copyright (C) 2007 IBM
5 *
6 * Author: Darrick J. Wong <darrick.wong@oracle.com>
7 */
8
9#include <linux/ipmi.h>
10#include <linux/module.h>
11#include <linux/hwmon.h>
12#include <linux/hwmon-sysfs.h>
13#include <linux/jiffies.h>
14#include <linux/mutex.h>
15#include <linux/slab.h>
16#include <linux/err.h>
17
18#define REFRESH_INTERVAL (2 * HZ)
19#define DRVNAME "ibmpex"
20
21#define PEX_GET_VERSION 1
22#define PEX_GET_SENSOR_COUNT 2
23#define PEX_GET_SENSOR_NAME 3
24#define PEX_RESET_HIGH_LOW 4
25#define PEX_GET_SENSOR_DATA 6
26
27#define PEX_NET_FUNCTION 0x3A
28#define PEX_COMMAND 0x3C
29
30static inline u16 extract_value(const char *data, int offset)
31{
32 return be16_to_cpup((__be16 *)&data[offset]);
33}
34
35#define TEMP_SENSOR 1
36#define POWER_SENSOR 2
37
38#define PEX_SENSOR_TYPE_LEN 3
39static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
40static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
41
42#define PEX_MULT_LEN 2
43static u8 const watt_sensor_sig[] = {0x41, 0x43};
44
45#define PEX_NUM_SENSOR_FUNCS 3
46static const char * const sensor_name_suffixes[] = {
47 "",
48 "_lowest",
49 "_highest"
50};
51
52static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
53static void ibmpex_register_bmc(int iface, struct device *dev);
54static void ibmpex_bmc_gone(int iface);
55
56struct ibmpex_sensor_data {
57 int in_use;
58 s16 values[PEX_NUM_SENSOR_FUNCS];
59 int multiplier;
60
61 struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
62};
63
64struct ibmpex_bmc_data {
65 struct list_head list;
66 struct device *hwmon_dev;
67 struct device *bmc_device;
68 struct mutex lock;
69 bool valid;
70 unsigned long last_updated; /* In jiffies */
71
72 struct ipmi_addr address;
73 struct completion read_complete;
74 struct ipmi_user *user;
75 int interface;
76
77 struct kernel_ipmi_msg tx_message;
78 unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
79 long tx_msgid;
80
81 unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
82 unsigned long rx_msg_len;
83 unsigned char rx_result;
84 int rx_recv_type;
85
86 unsigned char sensor_major;
87 unsigned char sensor_minor;
88
89 unsigned char num_sensors;
90 struct ibmpex_sensor_data *sensors;
91};
92
93struct ibmpex_driver_data {
94 struct list_head bmc_data;
95 struct ipmi_smi_watcher bmc_events;
96 struct ipmi_user_hndl ipmi_hndlrs;
97};
98
99static struct ibmpex_driver_data driver_data = {
100 .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
101 .bmc_events = {
102 .owner = THIS_MODULE,
103 .new_smi = ibmpex_register_bmc,
104 .smi_gone = ibmpex_bmc_gone,
105 },
106 .ipmi_hndlrs = {
107 .ipmi_recv_hndl = ibmpex_msg_handler,
108 },
109};
110
111static int ibmpex_send_message(struct ibmpex_bmc_data *data)
112{
113 int err;
114
115 err = ipmi_validate_addr(&data->address, sizeof(data->address));
116 if (err)
117 goto out;
118
119 data->tx_msgid++;
120 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
121 &data->tx_message, data, 0, 0, 0);
122 if (err)
123 goto out1;
124
125 return 0;
126out1:
127 dev_err(data->bmc_device, "request_settime=%x\n", err);
128 return err;
129out:
130 dev_err(data->bmc_device, "validate_addr=%x\n", err);
131 return err;
132}
133
134static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
135{
136 data->tx_msg_data[0] = PEX_GET_VERSION;
137 data->tx_message.data_len = 1;
138 ibmpex_send_message(data);
139
140 wait_for_completion(&data->read_complete);
141
142 if (data->rx_result || data->rx_msg_len != 6)
143 return -ENOENT;
144
145 data->sensor_major = data->rx_msg_data[0];
146 data->sensor_minor = data->rx_msg_data[1];
147
148 dev_info(data->bmc_device,
149 "Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
150 data->sensor_major,
151 data->sensor_minor,
152 extract_value(data->rx_msg_data, 2),
153 data->rx_msg_data[4],
154 data->rx_msg_data[5],
155 data->interface);
156
157 return 0;
158}
159
160static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
161{
162 data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
163 data->tx_message.data_len = 1;
164 ibmpex_send_message(data);
165
166 wait_for_completion(&data->read_complete);
167
168 if (data->rx_result || data->rx_msg_len != 1)
169 return -ENOENT;
170
171 return data->rx_msg_data[0];
172}
173
174static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
175{
176 data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
177 data->tx_msg_data[1] = sensor;
178 data->tx_message.data_len = 2;
179 ibmpex_send_message(data);
180
181 wait_for_completion(&data->read_complete);
182
183 if (data->rx_result || data->rx_msg_len < 1)
184 return -ENOENT;
185
186 return 0;
187}
188
189static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
190{
191 data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
192 data->tx_msg_data[1] = sensor;
193 data->tx_message.data_len = 2;
194 ibmpex_send_message(data);
195
196 wait_for_completion(&data->read_complete);
197
198 if (data->rx_result || data->rx_msg_len < 26) {
199 dev_err(data->bmc_device, "Error reading sensor %d.\n",
200 sensor);
201 return -ENOENT;
202 }
203
204 return 0;
205}
206
207static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
208{
209 data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
210 data->tx_message.data_len = 1;
211 ibmpex_send_message(data);
212
213 wait_for_completion(&data->read_complete);
214
215 return 0;
216}
217
218static void ibmpex_update_device(struct ibmpex_bmc_data *data)
219{
220 int i, err;
221
222 mutex_lock(&data->lock);
223 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
224 data->valid)
225 goto out;
226
227 for (i = 0; i < data->num_sensors; i++) {
228 if (!data->sensors[i].in_use)
229 continue;
230 err = ibmpex_query_sensor_data(data, i);
231 if (err)
232 continue;
233 data->sensors[i].values[0] =
234 extract_value(data->rx_msg_data, 16);
235 data->sensors[i].values[1] =
236 extract_value(data->rx_msg_data, 18);
237 data->sensors[i].values[2] =
238 extract_value(data->rx_msg_data, 20);
239 }
240
241 data->last_updated = jiffies;
242 data->valid = true;
243
244out:
245 mutex_unlock(&data->lock);
246}
247
248static struct ibmpex_bmc_data *get_bmc_data(int iface)
249{
250 struct ibmpex_bmc_data *p, *next;
251
252 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
253 if (p->interface == iface)
254 return p;
255
256 return NULL;
257}
258
259static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME);
260
261static ssize_t ibmpex_show_sensor(struct device *dev,
262 struct device_attribute *devattr,
263 char *buf)
264{
265 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
266 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
267 int mult = data->sensors[attr->index].multiplier;
268 ibmpex_update_device(data);
269
270 return sprintf(buf, "%d\n",
271 data->sensors[attr->index].values[attr->nr] * mult);
272}
273
274static ssize_t ibmpex_high_low_store(struct device *dev,
275 struct device_attribute *devattr,
276 const char *buf, size_t count)
277{
278 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
279
280 ibmpex_reset_high_low_data(data);
281
282 return count;
283}
284
285static SENSOR_DEVICE_ATTR_WO(reset_high_low, ibmpex_high_low, 0);
286
287static int is_power_sensor(const char *sensor_id, int len)
288{
289 if (len < PEX_SENSOR_TYPE_LEN)
290 return 0;
291
292 if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
293 return 1;
294 return 0;
295}
296
297static int is_temp_sensor(const char *sensor_id, int len)
298{
299 if (len < PEX_SENSOR_TYPE_LEN)
300 return 0;
301
302 if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
303 return 1;
304 return 0;
305}
306
307static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
308 const char *sensor_id, int len)
309{
310 int i;
311
312 if (data->sensor_major == 2)
313 return 1000000;
314
315 for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
316 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
317 return 1000000;
318
319 return 100000;
320}
321
322static int create_sensor(struct ibmpex_bmc_data *data, int type,
323 int counter, int sensor, int func)
324{
325 int err;
326 char *n;
327
328 n = kmalloc(32, GFP_KERNEL);
329 if (!n)
330 return -ENOMEM;
331
332 if (type == TEMP_SENSOR)
333 sprintf(n, "temp%d_input%s",
334 counter, sensor_name_suffixes[func]);
335 else if (type == POWER_SENSOR)
336 sprintf(n, "power%d_average%s",
337 counter, sensor_name_suffixes[func]);
338
339 sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
340 data->sensors[sensor].attr[func].dev_attr.attr.name = n;
341 data->sensors[sensor].attr[func].dev_attr.attr.mode = 0444;
342 data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
343 data->sensors[sensor].attr[func].index = sensor;
344 data->sensors[sensor].attr[func].nr = func;
345
346 err = device_create_file(data->bmc_device,
347 &data->sensors[sensor].attr[func].dev_attr);
348 if (err) {
349 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
350 kfree(n);
351 return err;
352 }
353
354 return 0;
355}
356
357static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
358{
359 int i, j, err;
360 int sensor_type;
361 int sensor_counter;
362 int num_power = 0;
363 int num_temp = 0;
364
365 err = ibmpex_query_sensor_count(data);
366 if (err <= 0)
367 return -ENOENT;
368 data->num_sensors = err;
369
370 data->sensors = kcalloc(data->num_sensors, sizeof(*data->sensors),
371 GFP_KERNEL);
372 if (!data->sensors)
373 return -ENOMEM;
374
375 for (i = 0; i < data->num_sensors; i++) {
376 err = ibmpex_query_sensor_name(data, i);
377 if (err)
378 continue;
379
380 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
381 sensor_type = POWER_SENSOR;
382 num_power++;
383 sensor_counter = num_power;
384 data->sensors[i].multiplier =
385 power_sensor_multiplier(data,
386 data->rx_msg_data,
387 data->rx_msg_len);
388 } else if (is_temp_sensor(data->rx_msg_data,
389 data->rx_msg_len)) {
390 sensor_type = TEMP_SENSOR;
391 num_temp++;
392 sensor_counter = num_temp;
393 data->sensors[i].multiplier = 1000;
394 } else
395 continue;
396
397 data->sensors[i].in_use = 1;
398
399 /* Create attributes */
400 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
401 err = create_sensor(data, sensor_type, sensor_counter,
402 i, j);
403 if (err)
404 goto exit_remove;
405 }
406 }
407
408 err = device_create_file(data->bmc_device,
409 &sensor_dev_attr_reset_high_low.dev_attr);
410 if (err)
411 goto exit_remove;
412
413 err = device_create_file(data->bmc_device, &dev_attr_name.attr);
414 if (err)
415 goto exit_remove;
416
417 return 0;
418
419exit_remove:
420 device_remove_file(data->bmc_device,
421 &sensor_dev_attr_reset_high_low.dev_attr);
422 device_remove_file(data->bmc_device, &dev_attr_name.attr);
423 for (i = 0; i < data->num_sensors; i++)
424 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
425 if (!data->sensors[i].attr[j].dev_attr.attr.name)
426 continue;
427 device_remove_file(data->bmc_device,
428 &data->sensors[i].attr[j].dev_attr);
429 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
430 }
431
432 kfree(data->sensors);
433 return err;
434}
435
436static void ibmpex_register_bmc(int iface, struct device *dev)
437{
438 struct ibmpex_bmc_data *data;
439 int err;
440
441 data = kzalloc(sizeof(*data), GFP_KERNEL);
442 if (!data)
443 return;
444
445 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
446 data->address.channel = IPMI_BMC_CHANNEL;
447 data->address.data[0] = 0;
448 data->interface = iface;
449 data->bmc_device = dev;
450
451 /* Create IPMI messaging interface user */
452 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
453 data, &data->user);
454 if (err < 0) {
455 dev_err(dev,
456 "Unable to register user with IPMI interface %d\n",
457 data->interface);
458 goto out;
459 }
460
461 mutex_init(&data->lock);
462
463 /* Initialize message */
464 data->tx_msgid = 0;
465 init_completion(&data->read_complete);
466 data->tx_message.netfn = PEX_NET_FUNCTION;
467 data->tx_message.cmd = PEX_COMMAND;
468 data->tx_message.data = data->tx_msg_data;
469
470 /* Does this BMC support PowerExecutive? */
471 err = ibmpex_ver_check(data);
472 if (err)
473 goto out_user;
474
475 /* Register the BMC as a HWMON class device */
476 data->hwmon_dev = hwmon_device_register(data->bmc_device);
477
478 if (IS_ERR(data->hwmon_dev)) {
479 dev_err(data->bmc_device,
480 "Unable to register hwmon device for IPMI interface %d\n",
481 data->interface);
482 goto out_user;
483 }
484
485 /* finally add the new bmc data to the bmc data list */
486 dev_set_drvdata(dev, data);
487 list_add_tail(&data->list, &driver_data.bmc_data);
488
489 /* Now go find all the sensors */
490 err = ibmpex_find_sensors(data);
491 if (err) {
492 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
493 goto out_register;
494 }
495
496 return;
497
498out_register:
499 list_del(&data->list);
500 hwmon_device_unregister(data->hwmon_dev);
501out_user:
502 ipmi_destroy_user(data->user);
503out:
504 kfree(data);
505}
506
507static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
508{
509 int i, j;
510
511 device_remove_file(data->bmc_device,
512 &sensor_dev_attr_reset_high_low.dev_attr);
513 device_remove_file(data->bmc_device, &dev_attr_name.attr);
514 for (i = 0; i < data->num_sensors; i++)
515 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
516 if (!data->sensors[i].attr[j].dev_attr.attr.name)
517 continue;
518 device_remove_file(data->bmc_device,
519 &data->sensors[i].attr[j].dev_attr);
520 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
521 }
522
523 list_del(&data->list);
524 dev_set_drvdata(data->bmc_device, NULL);
525 hwmon_device_unregister(data->hwmon_dev);
526 ipmi_destroy_user(data->user);
527 kfree(data->sensors);
528 kfree(data);
529}
530
531static void ibmpex_bmc_gone(int iface)
532{
533 struct ibmpex_bmc_data *data = get_bmc_data(iface);
534
535 if (!data)
536 return;
537
538 ibmpex_bmc_delete(data);
539}
540
541static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
542{
543 struct ibmpex_bmc_data *data = user_msg_data;
544
545 if (msg->msgid != data->tx_msgid) {
546 dev_err(data->bmc_device,
547 "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
548 (int)msg->msgid,
549 (int)data->tx_msgid);
550 ipmi_free_recv_msg(msg);
551 return;
552 }
553
554 data->rx_recv_type = msg->recv_type;
555 if (msg->msg.data_len > 0)
556 data->rx_result = msg->msg.data[0];
557 else
558 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
559
560 if (msg->msg.data_len > 1) {
561 data->rx_msg_len = msg->msg.data_len - 1;
562 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
563 } else
564 data->rx_msg_len = 0;
565
566 ipmi_free_recv_msg(msg);
567 complete(&data->read_complete);
568}
569
570static int __init ibmpex_init(void)
571{
572 return ipmi_smi_watcher_register(&driver_data.bmc_events);
573}
574
575static void __exit ibmpex_exit(void)
576{
577 struct ibmpex_bmc_data *p, *next;
578
579 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
580 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
581 ibmpex_bmc_delete(p);
582}
583
584MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
585MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
586MODULE_LICENSE("GPL");
587
588module_init(ibmpex_init);
589module_exit(ibmpex_exit);
590
591MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
592MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
593MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
594MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
595MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");