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1/*
2 * A hwmon driver for the IBM System Director Active Energy Manager (AEM)
3 * temperature/power/energy sensors and capping functionality.
4 * Copyright (C) 2008 IBM
5 *
6 * Author: Darrick J. Wong <djwong@us.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/ipmi.h>
26#include <linux/module.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/jiffies.h>
30#include <linux/mutex.h>
31#include <linux/kdev_t.h>
32#include <linux/spinlock.h>
33#include <linux/idr.h>
34#include <linux/slab.h>
35#include <linux/sched.h>
36#include <linux/platform_device.h>
37#include <linux/math64.h>
38#include <linux/time.h>
39
40#define REFRESH_INTERVAL (HZ)
41#define IPMI_TIMEOUT (30 * HZ)
42#define DRVNAME "aem"
43
44#define AEM_NETFN 0x2E
45
46#define AEM_FIND_FW_CMD 0x80
47#define AEM_ELEMENT_CMD 0x81
48#define AEM_FW_INSTANCE_CMD 0x82
49
50#define AEM_READ_ELEMENT_CFG 0x80
51#define AEM_READ_BUFFER 0x81
52#define AEM_READ_REGISTER 0x82
53#define AEM_WRITE_REGISTER 0x83
54#define AEM_SET_REG_MASK 0x84
55#define AEM_CLEAR_REG_MASK 0x85
56#define AEM_READ_ELEMENT_CFG2 0x86
57
58#define AEM_CONTROL_ELEMENT 0
59#define AEM_ENERGY_ELEMENT 1
60#define AEM_CLOCK_ELEMENT 4
61#define AEM_POWER_CAP_ELEMENT 7
62#define AEM_EXHAUST_ELEMENT 9
63#define AEM_POWER_ELEMENT 10
64
65#define AEM_MODULE_TYPE_ID 0x0001
66
67#define AEM2_NUM_ENERGY_REGS 2
68#define AEM2_NUM_PCAP_REGS 6
69#define AEM2_NUM_TEMP_REGS 2
70#define AEM2_NUM_SENSORS 14
71
72#define AEM1_NUM_ENERGY_REGS 1
73#define AEM1_NUM_SENSORS 3
74
75/* AEM 2.x has more energy registers */
76#define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS
77/* AEM 2.x needs more sensor files */
78#define AEM_NUM_SENSORS AEM2_NUM_SENSORS
79
80#define POWER_CAP 0
81#define POWER_CAP_MAX_HOTPLUG 1
82#define POWER_CAP_MAX 2
83#define POWER_CAP_MIN_WARNING 3
84#define POWER_CAP_MIN 4
85#define POWER_AUX 5
86
87#define AEM_DEFAULT_POWER_INTERVAL 1000
88#define AEM_MIN_POWER_INTERVAL 200
89#define UJ_PER_MJ 1000L
90
91static DEFINE_IDR(aem_idr);
92static DEFINE_SPINLOCK(aem_idr_lock);
93
94static struct platform_driver aem_driver = {
95 .driver = {
96 .name = DRVNAME,
97 .bus = &platform_bus_type,
98 }
99};
100
101struct aem_ipmi_data {
102 struct completion read_complete;
103 struct ipmi_addr address;
104 ipmi_user_t user;
105 int interface;
106
107 struct kernel_ipmi_msg tx_message;
108 long tx_msgid;
109
110 void *rx_msg_data;
111 unsigned short rx_msg_len;
112 unsigned char rx_result;
113 int rx_recv_type;
114
115 struct device *bmc_device;
116};
117
118struct aem_ro_sensor_template {
119 char *label;
120 ssize_t (*show)(struct device *dev,
121 struct device_attribute *devattr,
122 char *buf);
123 int index;
124};
125
126struct aem_rw_sensor_template {
127 char *label;
128 ssize_t (*show)(struct device *dev,
129 struct device_attribute *devattr,
130 char *buf);
131 ssize_t (*set)(struct device *dev,
132 struct device_attribute *devattr,
133 const char *buf, size_t count);
134 int index;
135};
136
137struct aem_data {
138 struct list_head list;
139
140 struct device *hwmon_dev;
141 struct platform_device *pdev;
142 struct mutex lock;
143 char valid;
144 unsigned long last_updated; /* In jiffies */
145 u8 ver_major;
146 u8 ver_minor;
147 u8 module_handle;
148 int id;
149 struct aem_ipmi_data ipmi;
150
151 /* Function to update sensors */
152 void (*update)(struct aem_data *data);
153
154 /*
155 * AEM 1.x sensors:
156 * Available sensors:
157 * Energy meter
158 * Power meter
159 *
160 * AEM 2.x sensors:
161 * Two energy meters
162 * Two power meters
163 * Two temperature sensors
164 * Six power cap registers
165 */
166
167 /* sysfs attrs */
168 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
169
170 /* energy use in mJ */
171 u64 energy[AEM_NUM_ENERGY_REGS];
172
173 /* power sampling interval in ms */
174 unsigned long power_period[AEM_NUM_ENERGY_REGS];
175
176 /* Everything past here is for AEM2 only */
177
178 /* power caps in dW */
179 u16 pcap[AEM2_NUM_PCAP_REGS];
180
181 /* exhaust temperature in C */
182 u8 temp[AEM2_NUM_TEMP_REGS];
183};
184
185/* Data structures returned by the AEM firmware */
186struct aem_iana_id {
187 u8 bytes[3];
188};
189static struct aem_iana_id system_x_id = {
190 .bytes = {0x4D, 0x4F, 0x00}
191};
192
193/* These are used to find AEM1 instances */
194struct aem_find_firmware_req {
195 struct aem_iana_id id;
196 u8 rsvd;
197 __be16 index;
198 __be16 module_type_id;
199} __packed;
200
201struct aem_find_firmware_resp {
202 struct aem_iana_id id;
203 u8 num_instances;
204} __packed;
205
206/* These are used to find AEM2 instances */
207struct aem_find_instance_req {
208 struct aem_iana_id id;
209 u8 instance_number;
210 __be16 module_type_id;
211} __packed;
212
213struct aem_find_instance_resp {
214 struct aem_iana_id id;
215 u8 num_instances;
216 u8 major;
217 u8 minor;
218 u8 module_handle;
219 u16 record_id;
220} __packed;
221
222/* These are used to query sensors */
223struct aem_read_sensor_req {
224 struct aem_iana_id id;
225 u8 module_handle;
226 u8 element;
227 u8 subcommand;
228 u8 reg;
229 u8 rx_buf_size;
230} __packed;
231
232struct aem_read_sensor_resp {
233 struct aem_iana_id id;
234 u8 bytes[0];
235} __packed;
236
237/* Data structures to talk to the IPMI layer */
238struct aem_driver_data {
239 struct list_head aem_devices;
240 struct ipmi_smi_watcher bmc_events;
241 struct ipmi_user_hndl ipmi_hndlrs;
242};
243
244static void aem_register_bmc(int iface, struct device *dev);
245static void aem_bmc_gone(int iface);
246static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
247
248static void aem_remove_sensors(struct aem_data *data);
249static int aem_init_aem1(struct aem_ipmi_data *probe);
250static int aem_init_aem2(struct aem_ipmi_data *probe);
251static int aem1_find_sensors(struct aem_data *data);
252static int aem2_find_sensors(struct aem_data *data);
253static void update_aem1_sensors(struct aem_data *data);
254static void update_aem2_sensors(struct aem_data *data);
255
256static struct aem_driver_data driver_data = {
257 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
258 .bmc_events = {
259 .owner = THIS_MODULE,
260 .new_smi = aem_register_bmc,
261 .smi_gone = aem_bmc_gone,
262 },
263 .ipmi_hndlrs = {
264 .ipmi_recv_hndl = aem_msg_handler,
265 },
266};
267
268/* Functions to talk to the IPMI layer */
269
270/* Initialize IPMI address, message buffers and user data */
271static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
272 struct device *bmc)
273{
274 int err;
275
276 init_completion(&data->read_complete);
277 data->bmc_device = bmc;
278
279 /* Initialize IPMI address */
280 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
281 data->address.channel = IPMI_BMC_CHANNEL;
282 data->address.data[0] = 0;
283 data->interface = iface;
284
285 /* Initialize message buffers */
286 data->tx_msgid = 0;
287 data->tx_message.netfn = AEM_NETFN;
288
289 /* Create IPMI messaging interface user */
290 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
291 data, &data->user);
292 if (err < 0) {
293 dev_err(bmc, "Unable to register user with IPMI "
294 "interface %d\n", data->interface);
295 return -EACCES;
296 }
297
298 return 0;
299}
300
301/* Send an IPMI command */
302static int aem_send_message(struct aem_ipmi_data *data)
303{
304 int err;
305
306 err = ipmi_validate_addr(&data->address, sizeof(data->address));
307 if (err)
308 goto out;
309
310 data->tx_msgid++;
311 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
312 &data->tx_message, data, 0, 0, 0);
313 if (err)
314 goto out1;
315
316 return 0;
317out1:
318 dev_err(data->bmc_device, "request_settime=%x\n", err);
319 return err;
320out:
321 dev_err(data->bmc_device, "validate_addr=%x\n", err);
322 return err;
323}
324
325/* Dispatch IPMI messages to callers */
326static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
327{
328 unsigned short rx_len;
329 struct aem_ipmi_data *data = user_msg_data;
330
331 if (msg->msgid != data->tx_msgid) {
332 dev_err(data->bmc_device, "Mismatch between received msgid "
333 "(%02x) and transmitted msgid (%02x)!\n",
334 (int)msg->msgid,
335 (int)data->tx_msgid);
336 ipmi_free_recv_msg(msg);
337 return;
338 }
339
340 data->rx_recv_type = msg->recv_type;
341 if (msg->msg.data_len > 0)
342 data->rx_result = msg->msg.data[0];
343 else
344 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
345
346 if (msg->msg.data_len > 1) {
347 rx_len = msg->msg.data_len - 1;
348 if (data->rx_msg_len < rx_len)
349 rx_len = data->rx_msg_len;
350 data->rx_msg_len = rx_len;
351 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
352 } else
353 data->rx_msg_len = 0;
354
355 ipmi_free_recv_msg(msg);
356 complete(&data->read_complete);
357}
358
359/* ID functions */
360
361/* Obtain an id */
362static int aem_idr_get(int *id)
363{
364 int i, err;
365
366again:
367 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
368 return -ENOMEM;
369
370 spin_lock(&aem_idr_lock);
371 err = idr_get_new(&aem_idr, NULL, &i);
372 spin_unlock(&aem_idr_lock);
373
374 if (unlikely(err == -EAGAIN))
375 goto again;
376 else if (unlikely(err))
377 return err;
378
379 *id = i & MAX_ID_MASK;
380 return 0;
381}
382
383/* Release an object ID */
384static void aem_idr_put(int id)
385{
386 spin_lock(&aem_idr_lock);
387 idr_remove(&aem_idr, id);
388 spin_unlock(&aem_idr_lock);
389}
390
391/* Sensor support functions */
392
393/* Read a sensor value */
394static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
395 void *buf, size_t size)
396{
397 int rs_size, res;
398 struct aem_read_sensor_req rs_req;
399 struct aem_read_sensor_resp *rs_resp;
400 struct aem_ipmi_data *ipmi = &data->ipmi;
401
402 /* AEM registers are 1, 2, 4 or 8 bytes */
403 switch (size) {
404 case 1:
405 case 2:
406 case 4:
407 case 8:
408 break;
409 default:
410 return -EINVAL;
411 }
412
413 rs_req.id = system_x_id;
414 rs_req.module_handle = data->module_handle;
415 rs_req.element = elt;
416 rs_req.subcommand = AEM_READ_REGISTER;
417 rs_req.reg = reg;
418 rs_req.rx_buf_size = size;
419
420 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
421 ipmi->tx_message.data = (char *)&rs_req;
422 ipmi->tx_message.data_len = sizeof(rs_req);
423
424 rs_size = sizeof(*rs_resp) + size;
425 rs_resp = kzalloc(rs_size, GFP_KERNEL);
426 if (!rs_resp)
427 return -ENOMEM;
428
429 ipmi->rx_msg_data = rs_resp;
430 ipmi->rx_msg_len = rs_size;
431
432 aem_send_message(ipmi);
433
434 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
435 if (!res) {
436 res = -ETIMEDOUT;
437 goto out;
438 }
439
440 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
441 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
442 res = -ENOENT;
443 goto out;
444 }
445
446 switch (size) {
447 case 1: {
448 u8 *x = buf;
449 *x = rs_resp->bytes[0];
450 break;
451 }
452 case 2: {
453 u16 *x = buf;
454 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
455 break;
456 }
457 case 4: {
458 u32 *x = buf;
459 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
460 break;
461 }
462 case 8: {
463 u64 *x = buf;
464 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
465 break;
466 }
467 }
468 res = 0;
469
470out:
471 kfree(rs_resp);
472 return res;
473}
474
475/* Update AEM energy registers */
476static void update_aem_energy_one(struct aem_data *data, int which)
477{
478 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
479 &data->energy[which], 8);
480}
481
482static void update_aem_energy(struct aem_data *data)
483{
484 update_aem_energy_one(data, 0);
485 if (data->ver_major < 2)
486 return;
487 update_aem_energy_one(data, 1);
488}
489
490/* Update all AEM1 sensors */
491static void update_aem1_sensors(struct aem_data *data)
492{
493 mutex_lock(&data->lock);
494 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
495 data->valid)
496 goto out;
497
498 update_aem_energy(data);
499out:
500 mutex_unlock(&data->lock);
501}
502
503/* Update all AEM2 sensors */
504static void update_aem2_sensors(struct aem_data *data)
505{
506 int i;
507
508 mutex_lock(&data->lock);
509 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
510 data->valid)
511 goto out;
512
513 update_aem_energy(data);
514 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
515 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
516
517 for (i = POWER_CAP; i <= POWER_AUX; i++)
518 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
519 &data->pcap[i], 2);
520out:
521 mutex_unlock(&data->lock);
522}
523
524/* Delete an AEM instance */
525static void aem_delete(struct aem_data *data)
526{
527 list_del(&data->list);
528 aem_remove_sensors(data);
529 hwmon_device_unregister(data->hwmon_dev);
530 ipmi_destroy_user(data->ipmi.user);
531 platform_set_drvdata(data->pdev, NULL);
532 platform_device_unregister(data->pdev);
533 aem_idr_put(data->id);
534 kfree(data);
535}
536
537/* Probe functions for AEM1 devices */
538
539/* Retrieve version and module handle for an AEM1 instance */
540static int aem_find_aem1_count(struct aem_ipmi_data *data)
541{
542 int res;
543 struct aem_find_firmware_req ff_req;
544 struct aem_find_firmware_resp ff_resp;
545
546 ff_req.id = system_x_id;
547 ff_req.index = 0;
548 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
549
550 data->tx_message.cmd = AEM_FIND_FW_CMD;
551 data->tx_message.data = (char *)&ff_req;
552 data->tx_message.data_len = sizeof(ff_req);
553
554 data->rx_msg_data = &ff_resp;
555 data->rx_msg_len = sizeof(ff_resp);
556
557 aem_send_message(data);
558
559 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
560 if (!res)
561 return -ETIMEDOUT;
562
563 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
564 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
565 return -ENOENT;
566
567 return ff_resp.num_instances;
568}
569
570/* Find and initialize one AEM1 instance */
571static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
572{
573 struct aem_data *data;
574 int i;
575 int res = -ENOMEM;
576
577 data = kzalloc(sizeof(*data), GFP_KERNEL);
578 if (!data)
579 return res;
580 mutex_init(&data->lock);
581
582 /* Copy instance data */
583 data->ver_major = 1;
584 data->ver_minor = 0;
585 data->module_handle = module_handle;
586 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
587 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
588
589 /* Create sub-device for this fw instance */
590 if (aem_idr_get(&data->id))
591 goto id_err;
592
593 data->pdev = platform_device_alloc(DRVNAME, data->id);
594 if (!data->pdev)
595 goto dev_err;
596 data->pdev->dev.driver = &aem_driver.driver;
597
598 res = platform_device_add(data->pdev);
599 if (res)
600 goto ipmi_err;
601
602 platform_set_drvdata(data->pdev, data);
603
604 /* Set up IPMI interface */
605 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
606 probe->bmc_device))
607 goto ipmi_err;
608
609 /* Register with hwmon */
610 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
611
612 if (IS_ERR(data->hwmon_dev)) {
613 dev_err(&data->pdev->dev, "Unable to register hwmon "
614 "device for IPMI interface %d\n",
615 probe->interface);
616 goto hwmon_reg_err;
617 }
618
619 data->update = update_aem1_sensors;
620
621 /* Find sensors */
622 if (aem1_find_sensors(data))
623 goto sensor_err;
624
625 /* Add to our list of AEM devices */
626 list_add_tail(&data->list, &driver_data.aem_devices);
627
628 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
629 data->ver_major, data->ver_minor,
630 data->module_handle);
631 return 0;
632
633sensor_err:
634 hwmon_device_unregister(data->hwmon_dev);
635hwmon_reg_err:
636 ipmi_destroy_user(data->ipmi.user);
637ipmi_err:
638 platform_set_drvdata(data->pdev, NULL);
639 platform_device_unregister(data->pdev);
640dev_err:
641 aem_idr_put(data->id);
642id_err:
643 kfree(data);
644
645 return res;
646}
647
648/* Find and initialize all AEM1 instances */
649static int aem_init_aem1(struct aem_ipmi_data *probe)
650{
651 int num, i, err;
652
653 num = aem_find_aem1_count(probe);
654 for (i = 0; i < num; i++) {
655 err = aem_init_aem1_inst(probe, i);
656 if (err) {
657 dev_err(probe->bmc_device,
658 "Error %d initializing AEM1 0x%X\n",
659 err, i);
660 return err;
661 }
662 }
663
664 return 0;
665}
666
667/* Probe functions for AEM2 devices */
668
669/* Retrieve version and module handle for an AEM2 instance */
670static int aem_find_aem2(struct aem_ipmi_data *data,
671 struct aem_find_instance_resp *fi_resp,
672 int instance_num)
673{
674 int res;
675 struct aem_find_instance_req fi_req;
676
677 fi_req.id = system_x_id;
678 fi_req.instance_number = instance_num;
679 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
680
681 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
682 data->tx_message.data = (char *)&fi_req;
683 data->tx_message.data_len = sizeof(fi_req);
684
685 data->rx_msg_data = fi_resp;
686 data->rx_msg_len = sizeof(*fi_resp);
687
688 aem_send_message(data);
689
690 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
691 if (!res)
692 return -ETIMEDOUT;
693
694 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
695 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
696 fi_resp->num_instances <= instance_num)
697 return -ENOENT;
698
699 return 0;
700}
701
702/* Find and initialize one AEM2 instance */
703static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
704 struct aem_find_instance_resp *fi_resp)
705{
706 struct aem_data *data;
707 int i;
708 int res = -ENOMEM;
709
710 data = kzalloc(sizeof(*data), GFP_KERNEL);
711 if (!data)
712 return res;
713 mutex_init(&data->lock);
714
715 /* Copy instance data */
716 data->ver_major = fi_resp->major;
717 data->ver_minor = fi_resp->minor;
718 data->module_handle = fi_resp->module_handle;
719 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
720 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
721
722 /* Create sub-device for this fw instance */
723 if (aem_idr_get(&data->id))
724 goto id_err;
725
726 data->pdev = platform_device_alloc(DRVNAME, data->id);
727 if (!data->pdev)
728 goto dev_err;
729 data->pdev->dev.driver = &aem_driver.driver;
730
731 res = platform_device_add(data->pdev);
732 if (res)
733 goto ipmi_err;
734
735 platform_set_drvdata(data->pdev, data);
736
737 /* Set up IPMI interface */
738 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
739 probe->bmc_device))
740 goto ipmi_err;
741
742 /* Register with hwmon */
743 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
744
745 if (IS_ERR(data->hwmon_dev)) {
746 dev_err(&data->pdev->dev, "Unable to register hwmon "
747 "device for IPMI interface %d\n",
748 probe->interface);
749 goto hwmon_reg_err;
750 }
751
752 data->update = update_aem2_sensors;
753
754 /* Find sensors */
755 if (aem2_find_sensors(data))
756 goto sensor_err;
757
758 /* Add to our list of AEM devices */
759 list_add_tail(&data->list, &driver_data.aem_devices);
760
761 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
762 data->ver_major, data->ver_minor,
763 data->module_handle);
764 return 0;
765
766sensor_err:
767 hwmon_device_unregister(data->hwmon_dev);
768hwmon_reg_err:
769 ipmi_destroy_user(data->ipmi.user);
770ipmi_err:
771 platform_set_drvdata(data->pdev, NULL);
772 platform_device_unregister(data->pdev);
773dev_err:
774 aem_idr_put(data->id);
775id_err:
776 kfree(data);
777
778 return res;
779}
780
781/* Find and initialize all AEM2 instances */
782static int aem_init_aem2(struct aem_ipmi_data *probe)
783{
784 struct aem_find_instance_resp fi_resp;
785 int err;
786 int i = 0;
787
788 while (!aem_find_aem2(probe, &fi_resp, i)) {
789 if (fi_resp.major != 2) {
790 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
791 "report this to the maintainer.\n",
792 fi_resp.major);
793 i++;
794 continue;
795 }
796 err = aem_init_aem2_inst(probe, &fi_resp);
797 if (err) {
798 dev_err(probe->bmc_device,
799 "Error %d initializing AEM2 0x%X\n",
800 err, fi_resp.module_handle);
801 return err;
802 }
803 i++;
804 }
805
806 return 0;
807}
808
809/* Probe a BMC for AEM firmware instances */
810static void aem_register_bmc(int iface, struct device *dev)
811{
812 struct aem_ipmi_data probe;
813
814 if (aem_init_ipmi_data(&probe, iface, dev))
815 return;
816
817 /* Ignore probe errors; they won't cause problems */
818 aem_init_aem1(&probe);
819 aem_init_aem2(&probe);
820
821 ipmi_destroy_user(probe.user);
822}
823
824/* Handle BMC deletion */
825static void aem_bmc_gone(int iface)
826{
827 struct aem_data *p1, *next1;
828
829 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
830 if (p1->ipmi.interface == iface)
831 aem_delete(p1);
832}
833
834/* sysfs support functions */
835
836/* AEM device name */
837static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
838 char *buf)
839{
840 struct aem_data *data = dev_get_drvdata(dev);
841
842 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
843}
844static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
845
846/* AEM device version */
847static ssize_t show_version(struct device *dev,
848 struct device_attribute *devattr,
849 char *buf)
850{
851 struct aem_data *data = dev_get_drvdata(dev);
852
853 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
854}
855static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
856
857/* Display power use */
858static ssize_t aem_show_power(struct device *dev,
859 struct device_attribute *devattr,
860 char *buf)
861{
862 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
863 struct aem_data *data = dev_get_drvdata(dev);
864 u64 before, after, delta, time;
865 signed long leftover;
866 struct timespec b, a;
867
868 mutex_lock(&data->lock);
869 update_aem_energy_one(data, attr->index);
870 getnstimeofday(&b);
871 before = data->energy[attr->index];
872
873 leftover = schedule_timeout_interruptible(
874 msecs_to_jiffies(data->power_period[attr->index])
875 );
876 if (leftover) {
877 mutex_unlock(&data->lock);
878 return 0;
879 }
880
881 update_aem_energy_one(data, attr->index);
882 getnstimeofday(&a);
883 after = data->energy[attr->index];
884 mutex_unlock(&data->lock);
885
886 time = timespec_to_ns(&a) - timespec_to_ns(&b);
887 delta = (after - before) * UJ_PER_MJ;
888
889 return sprintf(buf, "%llu\n",
890 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
891}
892
893/* Display energy use */
894static ssize_t aem_show_energy(struct device *dev,
895 struct device_attribute *devattr,
896 char *buf)
897{
898 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
899 struct aem_data *a = dev_get_drvdata(dev);
900 mutex_lock(&a->lock);
901 update_aem_energy_one(a, attr->index);
902 mutex_unlock(&a->lock);
903
904 return sprintf(buf, "%llu\n",
905 (unsigned long long)a->energy[attr->index] * 1000);
906}
907
908/* Display power interval registers */
909static ssize_t aem_show_power_period(struct device *dev,
910 struct device_attribute *devattr,
911 char *buf)
912{
913 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
914 struct aem_data *a = dev_get_drvdata(dev);
915 a->update(a);
916
917 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
918}
919
920/* Set power interval registers */
921static ssize_t aem_set_power_period(struct device *dev,
922 struct device_attribute *devattr,
923 const char *buf, size_t count)
924{
925 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
926 struct aem_data *a = dev_get_drvdata(dev);
927 unsigned long temp;
928 int res;
929
930 res = strict_strtoul(buf, 10, &temp);
931 if (res)
932 return res;
933
934 if (temp < AEM_MIN_POWER_INTERVAL)
935 return -EINVAL;
936
937 mutex_lock(&a->lock);
938 a->power_period[attr->index] = temp;
939 mutex_unlock(&a->lock);
940
941 return count;
942}
943
944/* Discover sensors on an AEM device */
945static int aem_register_sensors(struct aem_data *data,
946 struct aem_ro_sensor_template *ro,
947 struct aem_rw_sensor_template *rw)
948{
949 struct device *dev = &data->pdev->dev;
950 struct sensor_device_attribute *sensors = data->sensors;
951 int err;
952
953 /* Set up read-only sensors */
954 while (ro->label) {
955 sysfs_attr_init(&sensors->dev_attr.attr);
956 sensors->dev_attr.attr.name = ro->label;
957 sensors->dev_attr.attr.mode = S_IRUGO;
958 sensors->dev_attr.show = ro->show;
959 sensors->index = ro->index;
960
961 err = device_create_file(dev, &sensors->dev_attr);
962 if (err) {
963 sensors->dev_attr.attr.name = NULL;
964 goto error;
965 }
966 sensors++;
967 ro++;
968 }
969
970 /* Set up read-write sensors */
971 while (rw->label) {
972 sysfs_attr_init(&sensors->dev_attr.attr);
973 sensors->dev_attr.attr.name = rw->label;
974 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
975 sensors->dev_attr.show = rw->show;
976 sensors->dev_attr.store = rw->set;
977 sensors->index = rw->index;
978
979 err = device_create_file(dev, &sensors->dev_attr);
980 if (err) {
981 sensors->dev_attr.attr.name = NULL;
982 goto error;
983 }
984 sensors++;
985 rw++;
986 }
987
988 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
989 if (err)
990 goto error;
991 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
992 return err;
993
994error:
995 aem_remove_sensors(data);
996 return err;
997}
998
999/* sysfs support functions for AEM2 sensors */
1000
1001/* Display temperature use */
1002static ssize_t aem2_show_temp(struct device *dev,
1003 struct device_attribute *devattr,
1004 char *buf)
1005{
1006 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1007 struct aem_data *a = dev_get_drvdata(dev);
1008 a->update(a);
1009
1010 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
1011}
1012
1013/* Display power-capping registers */
1014static ssize_t aem2_show_pcap_value(struct device *dev,
1015 struct device_attribute *devattr,
1016 char *buf)
1017{
1018 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1019 struct aem_data *a = dev_get_drvdata(dev);
1020 a->update(a);
1021
1022 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1023}
1024
1025/* Remove sensors attached to an AEM device */
1026static void aem_remove_sensors(struct aem_data *data)
1027{
1028 int i;
1029
1030 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1031 if (!data->sensors[i].dev_attr.attr.name)
1032 continue;
1033 device_remove_file(&data->pdev->dev,
1034 &data->sensors[i].dev_attr);
1035 }
1036
1037 device_remove_file(&data->pdev->dev,
1038 &sensor_dev_attr_name.dev_attr);
1039 device_remove_file(&data->pdev->dev,
1040 &sensor_dev_attr_version.dev_attr);
1041}
1042
1043/* Sensor probe functions */
1044
1045/* Description of AEM1 sensors */
1046static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1047{"energy1_input", aem_show_energy, 0},
1048{"power1_average", aem_show_power, 0},
1049{NULL, NULL, 0},
1050};
1051
1052static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1053{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1054{NULL, NULL, NULL, 0},
1055};
1056
1057/* Description of AEM2 sensors */
1058static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1059{"energy1_input", aem_show_energy, 0},
1060{"energy2_input", aem_show_energy, 1},
1061{"power1_average", aem_show_power, 0},
1062{"power2_average", aem_show_power, 1},
1063{"temp1_input", aem2_show_temp, 0},
1064{"temp2_input", aem2_show_temp, 1},
1065
1066{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1067{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1068{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1069{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1070
1071{"power3_average", aem2_show_pcap_value, POWER_AUX},
1072{"power_cap", aem2_show_pcap_value, POWER_CAP},
1073{NULL, NULL, 0},
1074};
1075
1076static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1077{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1078{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1079{NULL, NULL, NULL, 0},
1080};
1081
1082/* Set up AEM1 sensor attrs */
1083static int aem1_find_sensors(struct aem_data *data)
1084{
1085 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1086}
1087
1088/* Set up AEM2 sensor attrs */
1089static int aem2_find_sensors(struct aem_data *data)
1090{
1091 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1092}
1093
1094/* Module init/exit routines */
1095
1096static int __init aem_init(void)
1097{
1098 int res;
1099
1100 res = driver_register(&aem_driver.driver);
1101 if (res) {
1102 pr_err("Can't register aem driver\n");
1103 return res;
1104 }
1105
1106 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1107 if (res)
1108 goto ipmi_reg_err;
1109 return 0;
1110
1111ipmi_reg_err:
1112 driver_unregister(&aem_driver.driver);
1113 return res;
1114
1115}
1116
1117static void __exit aem_exit(void)
1118{
1119 struct aem_data *p1, *next1;
1120
1121 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1122 driver_unregister(&aem_driver.driver);
1123 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1124 aem_delete(p1);
1125}
1126
1127MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1128MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1129MODULE_LICENSE("GPL");
1130
1131module_init(aem_init);
1132module_exit(aem_exit);
1133
1134MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1135MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1136MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1137MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1138MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1139MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1140MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");
1/*
2 * A hwmon driver for the IBM System Director Active Energy Manager (AEM)
3 * temperature/power/energy sensors and capping functionality.
4 * Copyright (C) 2008 IBM
5 *
6 * Author: Darrick J. Wong <darrick.wong@oracle.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/ipmi.h>
26#include <linux/module.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/jiffies.h>
30#include <linux/mutex.h>
31#include <linux/kdev_t.h>
32#include <linux/spinlock.h>
33#include <linux/idr.h>
34#include <linux/slab.h>
35#include <linux/sched.h>
36#include <linux/platform_device.h>
37#include <linux/math64.h>
38#include <linux/time.h>
39#include <linux/err.h>
40
41#define REFRESH_INTERVAL (HZ)
42#define IPMI_TIMEOUT (30 * HZ)
43#define DRVNAME "aem"
44
45#define AEM_NETFN 0x2E
46
47#define AEM_FIND_FW_CMD 0x80
48#define AEM_ELEMENT_CMD 0x81
49#define AEM_FW_INSTANCE_CMD 0x82
50
51#define AEM_READ_ELEMENT_CFG 0x80
52#define AEM_READ_BUFFER 0x81
53#define AEM_READ_REGISTER 0x82
54#define AEM_WRITE_REGISTER 0x83
55#define AEM_SET_REG_MASK 0x84
56#define AEM_CLEAR_REG_MASK 0x85
57#define AEM_READ_ELEMENT_CFG2 0x86
58
59#define AEM_CONTROL_ELEMENT 0
60#define AEM_ENERGY_ELEMENT 1
61#define AEM_CLOCK_ELEMENT 4
62#define AEM_POWER_CAP_ELEMENT 7
63#define AEM_EXHAUST_ELEMENT 9
64#define AEM_POWER_ELEMENT 10
65
66#define AEM_MODULE_TYPE_ID 0x0001
67
68#define AEM2_NUM_ENERGY_REGS 2
69#define AEM2_NUM_PCAP_REGS 6
70#define AEM2_NUM_TEMP_REGS 2
71#define AEM2_NUM_SENSORS 14
72
73#define AEM1_NUM_ENERGY_REGS 1
74#define AEM1_NUM_SENSORS 3
75
76/* AEM 2.x has more energy registers */
77#define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS
78/* AEM 2.x needs more sensor files */
79#define AEM_NUM_SENSORS AEM2_NUM_SENSORS
80
81#define POWER_CAP 0
82#define POWER_CAP_MAX_HOTPLUG 1
83#define POWER_CAP_MAX 2
84#define POWER_CAP_MIN_WARNING 3
85#define POWER_CAP_MIN 4
86#define POWER_AUX 5
87
88#define AEM_DEFAULT_POWER_INTERVAL 1000
89#define AEM_MIN_POWER_INTERVAL 200
90#define UJ_PER_MJ 1000L
91
92static DEFINE_IDA(aem_ida);
93
94static struct platform_driver aem_driver = {
95 .driver = {
96 .name = DRVNAME,
97 .bus = &platform_bus_type,
98 }
99};
100
101struct aem_ipmi_data {
102 struct completion read_complete;
103 struct ipmi_addr address;
104 ipmi_user_t user;
105 int interface;
106
107 struct kernel_ipmi_msg tx_message;
108 long tx_msgid;
109
110 void *rx_msg_data;
111 unsigned short rx_msg_len;
112 unsigned char rx_result;
113 int rx_recv_type;
114
115 struct device *bmc_device;
116};
117
118struct aem_ro_sensor_template {
119 char *label;
120 ssize_t (*show)(struct device *dev,
121 struct device_attribute *devattr,
122 char *buf);
123 int index;
124};
125
126struct aem_rw_sensor_template {
127 char *label;
128 ssize_t (*show)(struct device *dev,
129 struct device_attribute *devattr,
130 char *buf);
131 ssize_t (*set)(struct device *dev,
132 struct device_attribute *devattr,
133 const char *buf, size_t count);
134 int index;
135};
136
137struct aem_data {
138 struct list_head list;
139
140 struct device *hwmon_dev;
141 struct platform_device *pdev;
142 struct mutex lock;
143 char valid;
144 unsigned long last_updated; /* In jiffies */
145 u8 ver_major;
146 u8 ver_minor;
147 u8 module_handle;
148 int id;
149 struct aem_ipmi_data ipmi;
150
151 /* Function and buffer to update sensors */
152 void (*update)(struct aem_data *data);
153 struct aem_read_sensor_resp *rs_resp;
154
155 /*
156 * AEM 1.x sensors:
157 * Available sensors:
158 * Energy meter
159 * Power meter
160 *
161 * AEM 2.x sensors:
162 * Two energy meters
163 * Two power meters
164 * Two temperature sensors
165 * Six power cap registers
166 */
167
168 /* sysfs attrs */
169 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
170
171 /* energy use in mJ */
172 u64 energy[AEM_NUM_ENERGY_REGS];
173
174 /* power sampling interval in ms */
175 unsigned long power_period[AEM_NUM_ENERGY_REGS];
176
177 /* Everything past here is for AEM2 only */
178
179 /* power caps in dW */
180 u16 pcap[AEM2_NUM_PCAP_REGS];
181
182 /* exhaust temperature in C */
183 u8 temp[AEM2_NUM_TEMP_REGS];
184};
185
186/* Data structures returned by the AEM firmware */
187struct aem_iana_id {
188 u8 bytes[3];
189};
190static struct aem_iana_id system_x_id = {
191 .bytes = {0x4D, 0x4F, 0x00}
192};
193
194/* These are used to find AEM1 instances */
195struct aem_find_firmware_req {
196 struct aem_iana_id id;
197 u8 rsvd;
198 __be16 index;
199 __be16 module_type_id;
200} __packed;
201
202struct aem_find_firmware_resp {
203 struct aem_iana_id id;
204 u8 num_instances;
205} __packed;
206
207/* These are used to find AEM2 instances */
208struct aem_find_instance_req {
209 struct aem_iana_id id;
210 u8 instance_number;
211 __be16 module_type_id;
212} __packed;
213
214struct aem_find_instance_resp {
215 struct aem_iana_id id;
216 u8 num_instances;
217 u8 major;
218 u8 minor;
219 u8 module_handle;
220 u16 record_id;
221} __packed;
222
223/* These are used to query sensors */
224struct aem_read_sensor_req {
225 struct aem_iana_id id;
226 u8 module_handle;
227 u8 element;
228 u8 subcommand;
229 u8 reg;
230 u8 rx_buf_size;
231} __packed;
232
233struct aem_read_sensor_resp {
234 struct aem_iana_id id;
235 u8 bytes[0];
236} __packed;
237
238/* Data structures to talk to the IPMI layer */
239struct aem_driver_data {
240 struct list_head aem_devices;
241 struct ipmi_smi_watcher bmc_events;
242 struct ipmi_user_hndl ipmi_hndlrs;
243};
244
245static void aem_register_bmc(int iface, struct device *dev);
246static void aem_bmc_gone(int iface);
247static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
248
249static void aem_remove_sensors(struct aem_data *data);
250static int aem1_find_sensors(struct aem_data *data);
251static int aem2_find_sensors(struct aem_data *data);
252static void update_aem1_sensors(struct aem_data *data);
253static void update_aem2_sensors(struct aem_data *data);
254
255static struct aem_driver_data driver_data = {
256 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
257 .bmc_events = {
258 .owner = THIS_MODULE,
259 .new_smi = aem_register_bmc,
260 .smi_gone = aem_bmc_gone,
261 },
262 .ipmi_hndlrs = {
263 .ipmi_recv_hndl = aem_msg_handler,
264 },
265};
266
267/* Functions to talk to the IPMI layer */
268
269/* Initialize IPMI address, message buffers and user data */
270static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
271 struct device *bmc)
272{
273 int err;
274
275 init_completion(&data->read_complete);
276 data->bmc_device = bmc;
277
278 /* Initialize IPMI address */
279 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
280 data->address.channel = IPMI_BMC_CHANNEL;
281 data->address.data[0] = 0;
282 data->interface = iface;
283
284 /* Initialize message buffers */
285 data->tx_msgid = 0;
286 data->tx_message.netfn = AEM_NETFN;
287
288 /* Create IPMI messaging interface user */
289 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
290 data, &data->user);
291 if (err < 0) {
292 dev_err(bmc,
293 "Unable to register user with IPMI interface %d\n",
294 data->interface);
295 return err;
296 }
297
298 return 0;
299}
300
301/* Send an IPMI command */
302static int aem_send_message(struct aem_ipmi_data *data)
303{
304 int err;
305
306 err = ipmi_validate_addr(&data->address, sizeof(data->address));
307 if (err)
308 goto out;
309
310 data->tx_msgid++;
311 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
312 &data->tx_message, data, 0, 0, 0);
313 if (err)
314 goto out1;
315
316 return 0;
317out1:
318 dev_err(data->bmc_device, "request_settime=%x\n", err);
319 return err;
320out:
321 dev_err(data->bmc_device, "validate_addr=%x\n", err);
322 return err;
323}
324
325/* Dispatch IPMI messages to callers */
326static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
327{
328 unsigned short rx_len;
329 struct aem_ipmi_data *data = user_msg_data;
330
331 if (msg->msgid != data->tx_msgid) {
332 dev_err(data->bmc_device,
333 "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
334 (int)msg->msgid,
335 (int)data->tx_msgid);
336 ipmi_free_recv_msg(msg);
337 return;
338 }
339
340 data->rx_recv_type = msg->recv_type;
341 if (msg->msg.data_len > 0)
342 data->rx_result = msg->msg.data[0];
343 else
344 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
345
346 if (msg->msg.data_len > 1) {
347 rx_len = msg->msg.data_len - 1;
348 if (data->rx_msg_len < rx_len)
349 rx_len = data->rx_msg_len;
350 data->rx_msg_len = rx_len;
351 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
352 } else
353 data->rx_msg_len = 0;
354
355 ipmi_free_recv_msg(msg);
356 complete(&data->read_complete);
357}
358
359/* Sensor support functions */
360
361/* Read a sensor value; must be called with data->lock held */
362static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
363 void *buf, size_t size)
364{
365 int rs_size, res;
366 struct aem_read_sensor_req rs_req;
367 /* Use preallocated rx buffer */
368 struct aem_read_sensor_resp *rs_resp = data->rs_resp;
369 struct aem_ipmi_data *ipmi = &data->ipmi;
370
371 /* AEM registers are 1, 2, 4 or 8 bytes */
372 switch (size) {
373 case 1:
374 case 2:
375 case 4:
376 case 8:
377 break;
378 default:
379 return -EINVAL;
380 }
381
382 rs_req.id = system_x_id;
383 rs_req.module_handle = data->module_handle;
384 rs_req.element = elt;
385 rs_req.subcommand = AEM_READ_REGISTER;
386 rs_req.reg = reg;
387 rs_req.rx_buf_size = size;
388
389 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
390 ipmi->tx_message.data = (char *)&rs_req;
391 ipmi->tx_message.data_len = sizeof(rs_req);
392
393 rs_size = sizeof(*rs_resp) + size;
394 ipmi->rx_msg_data = rs_resp;
395 ipmi->rx_msg_len = rs_size;
396
397 aem_send_message(ipmi);
398
399 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
400 if (!res) {
401 res = -ETIMEDOUT;
402 goto out;
403 }
404
405 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
406 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
407 res = -ENOENT;
408 goto out;
409 }
410
411 switch (size) {
412 case 1: {
413 u8 *x = buf;
414 *x = rs_resp->bytes[0];
415 break;
416 }
417 case 2: {
418 u16 *x = buf;
419 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
420 break;
421 }
422 case 4: {
423 u32 *x = buf;
424 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
425 break;
426 }
427 case 8: {
428 u64 *x = buf;
429 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
430 break;
431 }
432 }
433 res = 0;
434
435out:
436 return res;
437}
438
439/* Update AEM energy registers */
440static void update_aem_energy_one(struct aem_data *data, int which)
441{
442 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
443 &data->energy[which], 8);
444}
445
446static void update_aem_energy(struct aem_data *data)
447{
448 update_aem_energy_one(data, 0);
449 if (data->ver_major < 2)
450 return;
451 update_aem_energy_one(data, 1);
452}
453
454/* Update all AEM1 sensors */
455static void update_aem1_sensors(struct aem_data *data)
456{
457 mutex_lock(&data->lock);
458 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
459 data->valid)
460 goto out;
461
462 update_aem_energy(data);
463out:
464 mutex_unlock(&data->lock);
465}
466
467/* Update all AEM2 sensors */
468static void update_aem2_sensors(struct aem_data *data)
469{
470 int i;
471
472 mutex_lock(&data->lock);
473 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
474 data->valid)
475 goto out;
476
477 update_aem_energy(data);
478 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
479 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
480
481 for (i = POWER_CAP; i <= POWER_AUX; i++)
482 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
483 &data->pcap[i], 2);
484out:
485 mutex_unlock(&data->lock);
486}
487
488/* Delete an AEM instance */
489static void aem_delete(struct aem_data *data)
490{
491 list_del(&data->list);
492 aem_remove_sensors(data);
493 kfree(data->rs_resp);
494 hwmon_device_unregister(data->hwmon_dev);
495 ipmi_destroy_user(data->ipmi.user);
496 platform_set_drvdata(data->pdev, NULL);
497 platform_device_unregister(data->pdev);
498 ida_simple_remove(&aem_ida, data->id);
499 kfree(data);
500}
501
502/* Probe functions for AEM1 devices */
503
504/* Retrieve version and module handle for an AEM1 instance */
505static int aem_find_aem1_count(struct aem_ipmi_data *data)
506{
507 int res;
508 struct aem_find_firmware_req ff_req;
509 struct aem_find_firmware_resp ff_resp;
510
511 ff_req.id = system_x_id;
512 ff_req.index = 0;
513 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
514
515 data->tx_message.cmd = AEM_FIND_FW_CMD;
516 data->tx_message.data = (char *)&ff_req;
517 data->tx_message.data_len = sizeof(ff_req);
518
519 data->rx_msg_data = &ff_resp;
520 data->rx_msg_len = sizeof(ff_resp);
521
522 aem_send_message(data);
523
524 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
525 if (!res)
526 return -ETIMEDOUT;
527
528 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
529 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
530 return -ENOENT;
531
532 return ff_resp.num_instances;
533}
534
535/* Find and initialize one AEM1 instance */
536static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
537{
538 struct aem_data *data;
539 int i;
540 int res = -ENOMEM;
541
542 data = kzalloc(sizeof(*data), GFP_KERNEL);
543 if (!data)
544 return res;
545 mutex_init(&data->lock);
546
547 /* Copy instance data */
548 data->ver_major = 1;
549 data->ver_minor = 0;
550 data->module_handle = module_handle;
551 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
552 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
553
554 /* Create sub-device for this fw instance */
555 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
556 if (data->id < 0)
557 goto id_err;
558
559 data->pdev = platform_device_alloc(DRVNAME, data->id);
560 if (!data->pdev)
561 goto dev_err;
562 data->pdev->dev.driver = &aem_driver.driver;
563
564 res = platform_device_add(data->pdev);
565 if (res)
566 goto ipmi_err;
567
568 platform_set_drvdata(data->pdev, data);
569
570 /* Set up IPMI interface */
571 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
572 probe->bmc_device);
573 if (res)
574 goto ipmi_err;
575
576 /* Register with hwmon */
577 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
578 if (IS_ERR(data->hwmon_dev)) {
579 dev_err(&data->pdev->dev,
580 "Unable to register hwmon device for IPMI interface %d\n",
581 probe->interface);
582 res = PTR_ERR(data->hwmon_dev);
583 goto hwmon_reg_err;
584 }
585
586 data->update = update_aem1_sensors;
587 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
588 if (!data->rs_resp) {
589 res = -ENOMEM;
590 goto alloc_resp_err;
591 }
592
593 /* Find sensors */
594 res = aem1_find_sensors(data);
595 if (res)
596 goto sensor_err;
597
598 /* Add to our list of AEM devices */
599 list_add_tail(&data->list, &driver_data.aem_devices);
600
601 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
602 data->ver_major, data->ver_minor,
603 data->module_handle);
604 return 0;
605
606sensor_err:
607 kfree(data->rs_resp);
608alloc_resp_err:
609 hwmon_device_unregister(data->hwmon_dev);
610hwmon_reg_err:
611 ipmi_destroy_user(data->ipmi.user);
612ipmi_err:
613 platform_set_drvdata(data->pdev, NULL);
614 platform_device_unregister(data->pdev);
615dev_err:
616 ida_simple_remove(&aem_ida, data->id);
617id_err:
618 kfree(data);
619
620 return res;
621}
622
623/* Find and initialize all AEM1 instances */
624static void aem_init_aem1(struct aem_ipmi_data *probe)
625{
626 int num, i, err;
627
628 num = aem_find_aem1_count(probe);
629 for (i = 0; i < num; i++) {
630 err = aem_init_aem1_inst(probe, i);
631 if (err) {
632 dev_err(probe->bmc_device,
633 "Error %d initializing AEM1 0x%X\n",
634 err, i);
635 }
636 }
637}
638
639/* Probe functions for AEM2 devices */
640
641/* Retrieve version and module handle for an AEM2 instance */
642static int aem_find_aem2(struct aem_ipmi_data *data,
643 struct aem_find_instance_resp *fi_resp,
644 int instance_num)
645{
646 int res;
647 struct aem_find_instance_req fi_req;
648
649 fi_req.id = system_x_id;
650 fi_req.instance_number = instance_num;
651 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
652
653 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
654 data->tx_message.data = (char *)&fi_req;
655 data->tx_message.data_len = sizeof(fi_req);
656
657 data->rx_msg_data = fi_resp;
658 data->rx_msg_len = sizeof(*fi_resp);
659
660 aem_send_message(data);
661
662 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
663 if (!res)
664 return -ETIMEDOUT;
665
666 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
667 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
668 fi_resp->num_instances <= instance_num)
669 return -ENOENT;
670
671 return 0;
672}
673
674/* Find and initialize one AEM2 instance */
675static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
676 struct aem_find_instance_resp *fi_resp)
677{
678 struct aem_data *data;
679 int i;
680 int res = -ENOMEM;
681
682 data = kzalloc(sizeof(*data), GFP_KERNEL);
683 if (!data)
684 return res;
685 mutex_init(&data->lock);
686
687 /* Copy instance data */
688 data->ver_major = fi_resp->major;
689 data->ver_minor = fi_resp->minor;
690 data->module_handle = fi_resp->module_handle;
691 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
692 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
693
694 /* Create sub-device for this fw instance */
695 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
696 if (data->id < 0)
697 goto id_err;
698
699 data->pdev = platform_device_alloc(DRVNAME, data->id);
700 if (!data->pdev)
701 goto dev_err;
702 data->pdev->dev.driver = &aem_driver.driver;
703
704 res = platform_device_add(data->pdev);
705 if (res)
706 goto ipmi_err;
707
708 platform_set_drvdata(data->pdev, data);
709
710 /* Set up IPMI interface */
711 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
712 probe->bmc_device);
713 if (res)
714 goto ipmi_err;
715
716 /* Register with hwmon */
717 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
718 if (IS_ERR(data->hwmon_dev)) {
719 dev_err(&data->pdev->dev,
720 "Unable to register hwmon device for IPMI interface %d\n",
721 probe->interface);
722 res = PTR_ERR(data->hwmon_dev);
723 goto hwmon_reg_err;
724 }
725
726 data->update = update_aem2_sensors;
727 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
728 if (!data->rs_resp) {
729 res = -ENOMEM;
730 goto alloc_resp_err;
731 }
732
733 /* Find sensors */
734 res = aem2_find_sensors(data);
735 if (res)
736 goto sensor_err;
737
738 /* Add to our list of AEM devices */
739 list_add_tail(&data->list, &driver_data.aem_devices);
740
741 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
742 data->ver_major, data->ver_minor,
743 data->module_handle);
744 return 0;
745
746sensor_err:
747 kfree(data->rs_resp);
748alloc_resp_err:
749 hwmon_device_unregister(data->hwmon_dev);
750hwmon_reg_err:
751 ipmi_destroy_user(data->ipmi.user);
752ipmi_err:
753 platform_set_drvdata(data->pdev, NULL);
754 platform_device_unregister(data->pdev);
755dev_err:
756 ida_simple_remove(&aem_ida, data->id);
757id_err:
758 kfree(data);
759
760 return res;
761}
762
763/* Find and initialize all AEM2 instances */
764static void aem_init_aem2(struct aem_ipmi_data *probe)
765{
766 struct aem_find_instance_resp fi_resp;
767 int err;
768 int i = 0;
769
770 while (!aem_find_aem2(probe, &fi_resp, i)) {
771 if (fi_resp.major != 2) {
772 dev_err(probe->bmc_device,
773 "Unknown AEM v%d; please report this to the maintainer.\n",
774 fi_resp.major);
775 i++;
776 continue;
777 }
778 err = aem_init_aem2_inst(probe, &fi_resp);
779 if (err) {
780 dev_err(probe->bmc_device,
781 "Error %d initializing AEM2 0x%X\n",
782 err, fi_resp.module_handle);
783 }
784 i++;
785 }
786}
787
788/* Probe a BMC for AEM firmware instances */
789static void aem_register_bmc(int iface, struct device *dev)
790{
791 struct aem_ipmi_data probe;
792
793 if (aem_init_ipmi_data(&probe, iface, dev))
794 return;
795
796 /* Ignore probe errors; they won't cause problems */
797 aem_init_aem1(&probe);
798 aem_init_aem2(&probe);
799
800 ipmi_destroy_user(probe.user);
801}
802
803/* Handle BMC deletion */
804static void aem_bmc_gone(int iface)
805{
806 struct aem_data *p1, *next1;
807
808 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
809 if (p1->ipmi.interface == iface)
810 aem_delete(p1);
811}
812
813/* sysfs support functions */
814
815/* AEM device name */
816static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
817 char *buf)
818{
819 struct aem_data *data = dev_get_drvdata(dev);
820
821 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
822}
823static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
824
825/* AEM device version */
826static ssize_t show_version(struct device *dev,
827 struct device_attribute *devattr,
828 char *buf)
829{
830 struct aem_data *data = dev_get_drvdata(dev);
831
832 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
833}
834static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
835
836/* Display power use */
837static ssize_t aem_show_power(struct device *dev,
838 struct device_attribute *devattr,
839 char *buf)
840{
841 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
842 struct aem_data *data = dev_get_drvdata(dev);
843 u64 before, after, delta, time;
844 signed long leftover;
845
846 mutex_lock(&data->lock);
847 update_aem_energy_one(data, attr->index);
848 time = ktime_get_ns();
849 before = data->energy[attr->index];
850
851 leftover = schedule_timeout_interruptible(
852 msecs_to_jiffies(data->power_period[attr->index])
853 );
854 if (leftover) {
855 mutex_unlock(&data->lock);
856 return 0;
857 }
858
859 update_aem_energy_one(data, attr->index);
860 time = ktime_get_ns() - time;
861 after = data->energy[attr->index];
862 mutex_unlock(&data->lock);
863
864 delta = (after - before) * UJ_PER_MJ;
865
866 return sprintf(buf, "%llu\n",
867 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
868}
869
870/* Display energy use */
871static ssize_t aem_show_energy(struct device *dev,
872 struct device_attribute *devattr,
873 char *buf)
874{
875 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
876 struct aem_data *a = dev_get_drvdata(dev);
877 mutex_lock(&a->lock);
878 update_aem_energy_one(a, attr->index);
879 mutex_unlock(&a->lock);
880
881 return sprintf(buf, "%llu\n",
882 (unsigned long long)a->energy[attr->index] * 1000);
883}
884
885/* Display power interval registers */
886static ssize_t aem_show_power_period(struct device *dev,
887 struct device_attribute *devattr,
888 char *buf)
889{
890 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
891 struct aem_data *a = dev_get_drvdata(dev);
892 a->update(a);
893
894 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
895}
896
897/* Set power interval registers */
898static ssize_t aem_set_power_period(struct device *dev,
899 struct device_attribute *devattr,
900 const char *buf, size_t count)
901{
902 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
903 struct aem_data *a = dev_get_drvdata(dev);
904 unsigned long temp;
905 int res;
906
907 res = kstrtoul(buf, 10, &temp);
908 if (res)
909 return res;
910
911 if (temp < AEM_MIN_POWER_INTERVAL)
912 return -EINVAL;
913
914 mutex_lock(&a->lock);
915 a->power_period[attr->index] = temp;
916 mutex_unlock(&a->lock);
917
918 return count;
919}
920
921/* Discover sensors on an AEM device */
922static int aem_register_sensors(struct aem_data *data,
923 const struct aem_ro_sensor_template *ro,
924 const struct aem_rw_sensor_template *rw)
925{
926 struct device *dev = &data->pdev->dev;
927 struct sensor_device_attribute *sensors = data->sensors;
928 int err;
929
930 /* Set up read-only sensors */
931 while (ro->label) {
932 sysfs_attr_init(&sensors->dev_attr.attr);
933 sensors->dev_attr.attr.name = ro->label;
934 sensors->dev_attr.attr.mode = S_IRUGO;
935 sensors->dev_attr.show = ro->show;
936 sensors->index = ro->index;
937
938 err = device_create_file(dev, &sensors->dev_attr);
939 if (err) {
940 sensors->dev_attr.attr.name = NULL;
941 goto error;
942 }
943 sensors++;
944 ro++;
945 }
946
947 /* Set up read-write sensors */
948 while (rw->label) {
949 sysfs_attr_init(&sensors->dev_attr.attr);
950 sensors->dev_attr.attr.name = rw->label;
951 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
952 sensors->dev_attr.show = rw->show;
953 sensors->dev_attr.store = rw->set;
954 sensors->index = rw->index;
955
956 err = device_create_file(dev, &sensors->dev_attr);
957 if (err) {
958 sensors->dev_attr.attr.name = NULL;
959 goto error;
960 }
961 sensors++;
962 rw++;
963 }
964
965 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
966 if (err)
967 goto error;
968 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
969 return err;
970
971error:
972 aem_remove_sensors(data);
973 return err;
974}
975
976/* sysfs support functions for AEM2 sensors */
977
978/* Display temperature use */
979static ssize_t aem2_show_temp(struct device *dev,
980 struct device_attribute *devattr,
981 char *buf)
982{
983 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
984 struct aem_data *a = dev_get_drvdata(dev);
985 a->update(a);
986
987 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
988}
989
990/* Display power-capping registers */
991static ssize_t aem2_show_pcap_value(struct device *dev,
992 struct device_attribute *devattr,
993 char *buf)
994{
995 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
996 struct aem_data *a = dev_get_drvdata(dev);
997 a->update(a);
998
999 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1000}
1001
1002/* Remove sensors attached to an AEM device */
1003static void aem_remove_sensors(struct aem_data *data)
1004{
1005 int i;
1006
1007 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1008 if (!data->sensors[i].dev_attr.attr.name)
1009 continue;
1010 device_remove_file(&data->pdev->dev,
1011 &data->sensors[i].dev_attr);
1012 }
1013
1014 device_remove_file(&data->pdev->dev,
1015 &sensor_dev_attr_name.dev_attr);
1016 device_remove_file(&data->pdev->dev,
1017 &sensor_dev_attr_version.dev_attr);
1018}
1019
1020/* Sensor probe functions */
1021
1022/* Description of AEM1 sensors */
1023static const struct aem_ro_sensor_template aem1_ro_sensors[] = {
1024{"energy1_input", aem_show_energy, 0},
1025{"power1_average", aem_show_power, 0},
1026{NULL, NULL, 0},
1027};
1028
1029static const struct aem_rw_sensor_template aem1_rw_sensors[] = {
1030{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1031{NULL, NULL, NULL, 0},
1032};
1033
1034/* Description of AEM2 sensors */
1035static const struct aem_ro_sensor_template aem2_ro_sensors[] = {
1036{"energy1_input", aem_show_energy, 0},
1037{"energy2_input", aem_show_energy, 1},
1038{"power1_average", aem_show_power, 0},
1039{"power2_average", aem_show_power, 1},
1040{"temp1_input", aem2_show_temp, 0},
1041{"temp2_input", aem2_show_temp, 1},
1042
1043{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1044{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1045{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1046{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1047
1048{"power3_average", aem2_show_pcap_value, POWER_AUX},
1049{"power_cap", aem2_show_pcap_value, POWER_CAP},
1050{NULL, NULL, 0},
1051};
1052
1053static const struct aem_rw_sensor_template aem2_rw_sensors[] = {
1054{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1055{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1056{NULL, NULL, NULL, 0},
1057};
1058
1059/* Set up AEM1 sensor attrs */
1060static int aem1_find_sensors(struct aem_data *data)
1061{
1062 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1063}
1064
1065/* Set up AEM2 sensor attrs */
1066static int aem2_find_sensors(struct aem_data *data)
1067{
1068 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1069}
1070
1071/* Module init/exit routines */
1072
1073static int __init aem_init(void)
1074{
1075 int res;
1076
1077 res = driver_register(&aem_driver.driver);
1078 if (res) {
1079 pr_err("Can't register aem driver\n");
1080 return res;
1081 }
1082
1083 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1084 if (res)
1085 goto ipmi_reg_err;
1086 return 0;
1087
1088ipmi_reg_err:
1089 driver_unregister(&aem_driver.driver);
1090 return res;
1091
1092}
1093
1094static void __exit aem_exit(void)
1095{
1096 struct aem_data *p1, *next1;
1097
1098 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1099 driver_unregister(&aem_driver.driver);
1100 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1101 aem_delete(p1);
1102}
1103
1104MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
1105MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1106MODULE_LICENSE("GPL");
1107
1108module_init(aem_init);
1109module_exit(aem_exit);
1110
1111MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1112MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1113MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1114MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1115MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1116MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1117MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");