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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 ssize_t name_show(struct device *dev, struct device_attribute *devattr,
260 char *buf)
261{
262 return sprintf(buf, "%s\n", DRVNAME);
263}
264static SENSOR_DEVICE_ATTR_RO(name, name, 0);
265
266static ssize_t ibmpex_show_sensor(struct device *dev,
267 struct device_attribute *devattr,
268 char *buf)
269{
270 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
271 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
272 int mult = data->sensors[attr->index].multiplier;
273 ibmpex_update_device(data);
274
275 return sprintf(buf, "%d\n",
276 data->sensors[attr->index].values[attr->nr] * mult);
277}
278
279static ssize_t ibmpex_high_low_store(struct device *dev,
280 struct device_attribute *devattr,
281 const char *buf, size_t count)
282{
283 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
284
285 ibmpex_reset_high_low_data(data);
286
287 return count;
288}
289
290static SENSOR_DEVICE_ATTR_WO(reset_high_low, ibmpex_high_low, 0);
291
292static int is_power_sensor(const char *sensor_id, int len)
293{
294 if (len < PEX_SENSOR_TYPE_LEN)
295 return 0;
296
297 if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
298 return 1;
299 return 0;
300}
301
302static int is_temp_sensor(const char *sensor_id, int len)
303{
304 if (len < PEX_SENSOR_TYPE_LEN)
305 return 0;
306
307 if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
308 return 1;
309 return 0;
310}
311
312static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
313 const char *sensor_id, int len)
314{
315 int i;
316
317 if (data->sensor_major == 2)
318 return 1000000;
319
320 for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
321 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
322 return 1000000;
323
324 return 100000;
325}
326
327static int create_sensor(struct ibmpex_bmc_data *data, int type,
328 int counter, int sensor, int func)
329{
330 int err;
331 char *n;
332
333 n = kmalloc(32, GFP_KERNEL);
334 if (!n)
335 return -ENOMEM;
336
337 if (type == TEMP_SENSOR)
338 sprintf(n, "temp%d_input%s",
339 counter, sensor_name_suffixes[func]);
340 else if (type == POWER_SENSOR)
341 sprintf(n, "power%d_average%s",
342 counter, sensor_name_suffixes[func]);
343
344 sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
345 data->sensors[sensor].attr[func].dev_attr.attr.name = n;
346 data->sensors[sensor].attr[func].dev_attr.attr.mode = 0444;
347 data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
348 data->sensors[sensor].attr[func].index = sensor;
349 data->sensors[sensor].attr[func].nr = func;
350
351 err = device_create_file(data->bmc_device,
352 &data->sensors[sensor].attr[func].dev_attr);
353 if (err) {
354 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
355 kfree(n);
356 return err;
357 }
358
359 return 0;
360}
361
362static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
363{
364 int i, j, err;
365 int sensor_type;
366 int sensor_counter;
367 int num_power = 0;
368 int num_temp = 0;
369
370 err = ibmpex_query_sensor_count(data);
371 if (err <= 0)
372 return -ENOENT;
373 data->num_sensors = err;
374
375 data->sensors = kcalloc(data->num_sensors, sizeof(*data->sensors),
376 GFP_KERNEL);
377 if (!data->sensors)
378 return -ENOMEM;
379
380 for (i = 0; i < data->num_sensors; i++) {
381 err = ibmpex_query_sensor_name(data, i);
382 if (err)
383 continue;
384
385 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
386 sensor_type = POWER_SENSOR;
387 num_power++;
388 sensor_counter = num_power;
389 data->sensors[i].multiplier =
390 power_sensor_multiplier(data,
391 data->rx_msg_data,
392 data->rx_msg_len);
393 } else if (is_temp_sensor(data->rx_msg_data,
394 data->rx_msg_len)) {
395 sensor_type = TEMP_SENSOR;
396 num_temp++;
397 sensor_counter = num_temp;
398 data->sensors[i].multiplier = 1000;
399 } else
400 continue;
401
402 data->sensors[i].in_use = 1;
403
404 /* Create attributes */
405 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
406 err = create_sensor(data, sensor_type, sensor_counter,
407 i, j);
408 if (err)
409 goto exit_remove;
410 }
411 }
412
413 err = device_create_file(data->bmc_device,
414 &sensor_dev_attr_reset_high_low.dev_attr);
415 if (err)
416 goto exit_remove;
417
418 err = device_create_file(data->bmc_device,
419 &sensor_dev_attr_name.dev_attr);
420 if (err)
421 goto exit_remove;
422
423 return 0;
424
425exit_remove:
426 device_remove_file(data->bmc_device,
427 &sensor_dev_attr_reset_high_low.dev_attr);
428 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
429 for (i = 0; i < data->num_sensors; i++)
430 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
431 if (!data->sensors[i].attr[j].dev_attr.attr.name)
432 continue;
433 device_remove_file(data->bmc_device,
434 &data->sensors[i].attr[j].dev_attr);
435 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
436 }
437
438 kfree(data->sensors);
439 return err;
440}
441
442static void ibmpex_register_bmc(int iface, struct device *dev)
443{
444 struct ibmpex_bmc_data *data;
445 int err;
446
447 data = kzalloc(sizeof(*data), GFP_KERNEL);
448 if (!data)
449 return;
450
451 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
452 data->address.channel = IPMI_BMC_CHANNEL;
453 data->address.data[0] = 0;
454 data->interface = iface;
455 data->bmc_device = dev;
456
457 /* Create IPMI messaging interface user */
458 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
459 data, &data->user);
460 if (err < 0) {
461 dev_err(dev,
462 "Unable to register user with IPMI interface %d\n",
463 data->interface);
464 goto out;
465 }
466
467 mutex_init(&data->lock);
468
469 /* Initialize message */
470 data->tx_msgid = 0;
471 init_completion(&data->read_complete);
472 data->tx_message.netfn = PEX_NET_FUNCTION;
473 data->tx_message.cmd = PEX_COMMAND;
474 data->tx_message.data = data->tx_msg_data;
475
476 /* Does this BMC support PowerExecutive? */
477 err = ibmpex_ver_check(data);
478 if (err)
479 goto out_user;
480
481 /* Register the BMC as a HWMON class device */
482 data->hwmon_dev = hwmon_device_register(data->bmc_device);
483
484 if (IS_ERR(data->hwmon_dev)) {
485 dev_err(data->bmc_device,
486 "Unable to register hwmon device for IPMI interface %d\n",
487 data->interface);
488 goto out_user;
489 }
490
491 /* finally add the new bmc data to the bmc data list */
492 dev_set_drvdata(dev, data);
493 list_add_tail(&data->list, &driver_data.bmc_data);
494
495 /* Now go find all the sensors */
496 err = ibmpex_find_sensors(data);
497 if (err) {
498 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
499 goto out_register;
500 }
501
502 return;
503
504out_register:
505 list_del(&data->list);
506 hwmon_device_unregister(data->hwmon_dev);
507out_user:
508 ipmi_destroy_user(data->user);
509out:
510 kfree(data);
511}
512
513static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
514{
515 int i, j;
516
517 device_remove_file(data->bmc_device,
518 &sensor_dev_attr_reset_high_low.dev_attr);
519 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
520 for (i = 0; i < data->num_sensors; i++)
521 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
522 if (!data->sensors[i].attr[j].dev_attr.attr.name)
523 continue;
524 device_remove_file(data->bmc_device,
525 &data->sensors[i].attr[j].dev_attr);
526 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
527 }
528
529 list_del(&data->list);
530 dev_set_drvdata(data->bmc_device, NULL);
531 hwmon_device_unregister(data->hwmon_dev);
532 ipmi_destroy_user(data->user);
533 kfree(data->sensors);
534 kfree(data);
535}
536
537static void ibmpex_bmc_gone(int iface)
538{
539 struct ibmpex_bmc_data *data = get_bmc_data(iface);
540
541 if (!data)
542 return;
543
544 ibmpex_bmc_delete(data);
545}
546
547static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
548{
549 struct ibmpex_bmc_data *data = user_msg_data;
550
551 if (msg->msgid != data->tx_msgid) {
552 dev_err(data->bmc_device,
553 "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
554 (int)msg->msgid,
555 (int)data->tx_msgid);
556 ipmi_free_recv_msg(msg);
557 return;
558 }
559
560 data->rx_recv_type = msg->recv_type;
561 if (msg->msg.data_len > 0)
562 data->rx_result = msg->msg.data[0];
563 else
564 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
565
566 if (msg->msg.data_len > 1) {
567 data->rx_msg_len = msg->msg.data_len - 1;
568 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
569 } else
570 data->rx_msg_len = 0;
571
572 ipmi_free_recv_msg(msg);
573 complete(&data->read_complete);
574}
575
576static int __init ibmpex_init(void)
577{
578 return ipmi_smi_watcher_register(&driver_data.bmc_events);
579}
580
581static void __exit ibmpex_exit(void)
582{
583 struct ibmpex_bmc_data *p, *next;
584
585 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
586 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
587 ibmpex_bmc_delete(p);
588}
589
590MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
591MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
592MODULE_LICENSE("GPL");
593
594module_init(ibmpex_init);
595module_exit(ibmpex_exit);
596
597MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
598MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
599MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
600MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
601MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
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
43static 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
52static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
53static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
54
55#define PEX_MULT_LEN 2
56static u8 const watt_sensor_sig[] = {0x41, 0x43};
57
58#define PEX_NUM_SENSOR_FUNCS 3
59static char const * const power_sensor_name_templates[] = {
60 "%s%d_average",
61 "%s%d_average_lowest",
62 "%s%d_average_highest"
63};
64static char const * const temp_sensor_name_templates[] = {
65 "%s%d_input",
66 "%s%d_input_lowest",
67 "%s%d_input_highest"
68};
69
70static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
71static void ibmpex_register_bmc(int iface, struct device *dev);
72static void ibmpex_bmc_gone(int iface);
73
74struct 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
82struct 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
111struct 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
117static 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
129static 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;
144out1:
145 dev_err(data->bmc_device, "request_settime=%x\n", err);
146 return err;
147out:
148 dev_err(data->bmc_device, "validate_addr=%x\n", err);
149 return err;
150}
151
152static 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
178static 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
192static 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
207static 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
225static 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
236static 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
262out:
263 mutex_unlock(&data->lock);
264}
265
266static 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
277static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
278 char *buf)
279{
280 return sprintf(buf, "%s\n", DRVNAME);
281}
282static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
283
284static 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
297static 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
309static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
310 ibmpex_reset_high_low, 0);
311
312static 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
322static 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
332static 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
347static 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
380static 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
443exit_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
460static 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
524out_register:
525 hwmon_device_unregister(data->hwmon_dev);
526out_user:
527 ipmi_destroy_user(data->user);
528out:
529 kfree(data);
530}
531
532static 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
556static 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
566static 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
595static int __init ibmpex_init(void)
596{
597 return ipmi_smi_watcher_register(&driver_data.bmc_events);
598}
599
600static 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
609MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
610MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
611MODULE_LICENSE("GPL");
612
613module_init(ibmpex_init);
614module_exit(ibmpex_exit);
615
616MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
617MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
618MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
619MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
620MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");