?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
hwmon: (ibmaem) add missing kfree
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / ibmaem.c
bloba818105d91108501e6b67b2662a47511f50c5ed3
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 #include <linux/ipmi.h>
24 #include <linux/module.h>
25 #include <linux/hwmon.h>
26 #include <linux/hwmon-sysfs.h>
27 #include <linux/jiffies.h>
28 #include <linux/mutex.h>
29 #include <linux/kdev_t.h>
30 #include <linux/spinlock.h>
31 #include <linux/idr.h>
32 #include <linux/sched.h>
33 #include <linux/platform_device.h>
34 #include <linux/math64.h>
35 #include <linux/time.h>
36
37 #define REFRESH_INTERVAL (HZ)
38 #define IPMI_TIMEOUT (30 * HZ)
39 #define DRVNAME "aem"
40
41 #define AEM_NETFN 0x2E
42
43 #define AEM_FIND_FW_CMD 0x80
44 #define AEM_ELEMENT_CMD 0x81
45 #define AEM_FW_INSTANCE_CMD 0x82
46
47 #define AEM_READ_ELEMENT_CFG 0x80
48 #define AEM_READ_BUFFER 0x81
49 #define AEM_READ_REGISTER 0x82
50 #define AEM_WRITE_REGISTER 0x83
51 #define AEM_SET_REG_MASK 0x84
52 #define AEM_CLEAR_REG_MASK 0x85
53 #define AEM_READ_ELEMENT_CFG2 0x86
54
55 #define AEM_CONTROL_ELEMENT 0
56 #define AEM_ENERGY_ELEMENT 1
57 #define AEM_CLOCK_ELEMENT 4
58 #define AEM_POWER_CAP_ELEMENT 7
59 #define AEM_EXHAUST_ELEMENT 9
60 #define AEM_POWER_ELEMENT 10
61
62 #define AEM_MODULE_TYPE_ID 0x0001
63
64 #define AEM2_NUM_ENERGY_REGS 2
65 #define AEM2_NUM_PCAP_REGS 6
66 #define AEM2_NUM_TEMP_REGS 2
67 #define AEM2_NUM_SENSORS 14
68
69 #define AEM1_NUM_ENERGY_REGS 1
70 #define AEM1_NUM_SENSORS 3
71
72 /* AEM 2.x has more energy registers */
73 #define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS
74 /* AEM 2.x needs more sensor files */
75 #define AEM_NUM_SENSORS AEM2_NUM_SENSORS
76
77 #define POWER_CAP 0
78 #define POWER_CAP_MAX_HOTPLUG 1
79 #define POWER_CAP_MAX 2
80 #define POWER_CAP_MIN_WARNING 3
81 #define POWER_CAP_MIN 4
82 #define POWER_AUX 5
83
84 #define AEM_DEFAULT_POWER_INTERVAL 1000
85 #define AEM_MIN_POWER_INTERVAL 200
86 #define UJ_PER_MJ 1000L
87
88 static DEFINE_IDR(aem_idr);
89 static DEFINE_SPINLOCK(aem_idr_lock);
90
91 static struct platform_driver aem_driver = {
92 .driver = {
93 .name = DRVNAME,
94 .bus = &platform_bus_type,
95 }
96 };
97
98 struct aem_ipmi_data {
99 struct completion read_complete;
100 struct ipmi_addr address;
101 ipmi_user_t user;
102 int interface;
103
104 struct kernel_ipmi_msg tx_message;
105 long tx_msgid;
106
107 void *rx_msg_data;
108 unsigned short rx_msg_len;
109 unsigned char rx_result;
110 int rx_recv_type;
111
112 struct device *bmc_device;
113 };
114
115 struct aem_ro_sensor_template {
116 char *label;
117 ssize_t (*show)(struct device *dev,
118 struct device_attribute *devattr,
119 char *buf);
120 int index;
121 };
122
123 struct aem_rw_sensor_template {
124 char *label;
125 ssize_t (*show)(struct device *dev,
126 struct device_attribute *devattr,
127 char *buf);
128 ssize_t (*set)(struct device *dev,
129 struct device_attribute *devattr,
130 const char *buf, size_t count);
131 int index;
132 };
133
134 struct aem_data {
135 struct list_head list;
136
137 struct device *hwmon_dev;
138 struct platform_device *pdev;
139 struct mutex lock;
140 char valid;
141 unsigned long last_updated; /* In jiffies */
142 u8 ver_major;
143 u8 ver_minor;
144 u8 module_handle;
145 int id;
146 struct aem_ipmi_data ipmi;
147
148 /* Function to update sensors */
149 void (*update)(struct aem_data *data);
150
151 /*
152 * AEM 1.x sensors:
153 * Available sensors:
154 * Energy meter
155 * Power meter
156 *
157 * AEM 2.x sensors:
158 * Two energy meters
159 * Two power meters
160 * Two temperature sensors
161 * Six power cap registers
162 */
163
164 /* sysfs attrs */
165 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
166
167 /* energy use in mJ */
168 u64 energy[AEM_NUM_ENERGY_REGS];
169
170 /* power sampling interval in ms */
171 unsigned long power_period[AEM_NUM_ENERGY_REGS];
172
173 /* Everything past here is for AEM2 only */
174
175 /* power caps in dW */
176 u16 pcap[AEM2_NUM_PCAP_REGS];
177
178 /* exhaust temperature in C */
179 u8 temp[AEM2_NUM_TEMP_REGS];
180 };
181
182 /* Data structures returned by the AEM firmware */
183 struct aem_iana_id {
184 u8 bytes[3];
185 };
186 static struct aem_iana_id system_x_id = {
187 .bytes = {0x4D, 0x4F, 0x00}
188 };
189
190 /* These are used to find AEM1 instances */
191 struct aem_find_firmware_req {
192 struct aem_iana_id id;
193 u8 rsvd;
194 __be16 index;
195 __be16 module_type_id;
196 } __packed;
197
198 struct aem_find_firmware_resp {
199 struct aem_iana_id id;
200 u8 num_instances;
201 } __packed;
202
203 /* These are used to find AEM2 instances */
204 struct aem_find_instance_req {
205 struct aem_iana_id id;
206 u8 instance_number;
207 __be16 module_type_id;
208 } __packed;
209
210 struct aem_find_instance_resp {
211 struct aem_iana_id id;
212 u8 num_instances;
213 u8 major;
214 u8 minor;
215 u8 module_handle;
216 u16 record_id;
217 } __packed;
218
219 /* These are used to query sensors */
220 struct aem_read_sensor_req {
221 struct aem_iana_id id;
222 u8 module_handle;
223 u8 element;
224 u8 subcommand;
225 u8 reg;
226 u8 rx_buf_size;
227 } __packed;
228
229 struct aem_read_sensor_resp {
230 struct aem_iana_id id;
231 u8 bytes[0];
232 } __packed;
233
234 /* Data structures to talk to the IPMI layer */
235 struct aem_driver_data {
236 struct list_head aem_devices;
237 struct ipmi_smi_watcher bmc_events;
238 struct ipmi_user_hndl ipmi_hndlrs;
239 };
240
241 static void aem_register_bmc(int iface, struct device *dev);
242 static void aem_bmc_gone(int iface);
243 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
244
245 static void aem_remove_sensors(struct aem_data *data);
246 static int aem_init_aem1(struct aem_ipmi_data *probe);
247 static int aem_init_aem2(struct aem_ipmi_data *probe);
248 static int aem1_find_sensors(struct aem_data *data);
249 static int aem2_find_sensors(struct aem_data *data);
250 static void update_aem1_sensors(struct aem_data *data);
251 static void update_aem2_sensors(struct aem_data *data);
252
253 static struct aem_driver_data driver_data = {
254 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
255 .bmc_events = {
256 .owner = THIS_MODULE,
257 .new_smi = aem_register_bmc,
258 .smi_gone = aem_bmc_gone,
259 },
260 .ipmi_hndlrs = {
261 .ipmi_recv_hndl = aem_msg_handler,
262 },
263 };
264
265 /* Functions to talk to the IPMI layer */
266
267 /* Initialize IPMI address, message buffers and user data */
268 static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
269 struct device *bmc)
270 {
271 int err;
272
273 init_completion(&data->read_complete);
274 data->bmc_device = bmc;
275
276 /* Initialize IPMI address */
277 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
278 data->address.channel = IPMI_BMC_CHANNEL;
279 data->address.data[0] = 0;
280 data->interface = iface;
281
282 /* Initialize message buffers */
283 data->tx_msgid = 0;
284 data->tx_message.netfn = AEM_NETFN;
285
286 /* Create IPMI messaging interface user */
287 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
288 data, &data->user);
289 if (err < 0) {
290 dev_err(bmc, "Unable to register user with IPMI "
291 "interface %d\n", data->interface);
292 return -EACCES;
293 }
294
295 return 0;
296 }
297
298 /* Send an IPMI command */
299 static int aem_send_message(struct aem_ipmi_data *data)
300 {
301 int err;
302
303 err = ipmi_validate_addr(&data->address, sizeof(data->address));
304 if (err)
305 goto out;
306
307 data->tx_msgid++;
308 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
309 &data->tx_message, data, 0, 0, 0);
310 if (err)
311 goto out1;
312
313 return 0;
314 out1:
315 dev_err(data->bmc_device, "request_settime=%x\n", err);
316 return err;
317 out:
318 dev_err(data->bmc_device, "validate_addr=%x\n", err);
319 return err;
320 }
321
322 /* Dispatch IPMI messages to callers */
323 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
324 {
325 unsigned short rx_len;
326 struct aem_ipmi_data *data = user_msg_data;
327
328 if (msg->msgid != data->tx_msgid) {
329 dev_err(data->bmc_device, "Mismatch between received msgid "
330 "(%02x) and transmitted msgid (%02x)!\n",
331 (int)msg->msgid,
332 (int)data->tx_msgid);
333 ipmi_free_recv_msg(msg);
334 return;
335 }
336
337 data->rx_recv_type = msg->recv_type;
338 if (msg->msg.data_len > 0)
339 data->rx_result = msg->msg.data[0];
340 else
341 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
342
343 if (msg->msg.data_len > 1) {
344 rx_len = msg->msg.data_len - 1;
345 if (data->rx_msg_len < rx_len)
346 rx_len = data->rx_msg_len;
347 data->rx_msg_len = rx_len;
348 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
349 } else
350 data->rx_msg_len = 0;
351
352 ipmi_free_recv_msg(msg);
353 complete(&data->read_complete);
354 }
355
356 /* ID functions */
357
358 /* Obtain an id */
359 static int aem_idr_get(int *id)
360 {
361 int i, err;
362
363 again:
364 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
365 return -ENOMEM;
366
367 spin_lock(&aem_idr_lock);
368 err = idr_get_new(&aem_idr, NULL, &i);
369 spin_unlock(&aem_idr_lock);
370
371 if (unlikely(err == -EAGAIN))
372 goto again;
373 else if (unlikely(err))
374 return err;
375
376 *id = i & MAX_ID_MASK;
377 return 0;
378 }
379
380 /* Release an object ID */
381 static void aem_idr_put(int id)
382 {
383 spin_lock(&aem_idr_lock);
384 idr_remove(&aem_idr, id);
385 spin_unlock(&aem_idr_lock);
386 }
387
388 /* Sensor support functions */
389
390 /* Read a sensor value */
391 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
392 void *buf, size_t size)
393 {
394 int rs_size, res;
395 struct aem_read_sensor_req rs_req;
396 struct aem_read_sensor_resp *rs_resp;
397 struct aem_ipmi_data *ipmi = &data->ipmi;
398
399 /* AEM registers are 1, 2, 4 or 8 bytes */
400 switch (size) {
401 case 1:
402 case 2:
403 case 4:
404 case 8:
405 break;
406 default:
407 return -EINVAL;
408 }
409
410 rs_req.id = system_x_id;
411 rs_req.module_handle = data->module_handle;
412 rs_req.element = elt;
413 rs_req.subcommand = AEM_READ_REGISTER;
414 rs_req.reg = reg;
415 rs_req.rx_buf_size = size;
416
417 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
418 ipmi->tx_message.data = (char *)&rs_req;
419 ipmi->tx_message.data_len = sizeof(rs_req);
420
421 rs_size = sizeof(*rs_resp) + size;
422 rs_resp = kzalloc(rs_size, GFP_KERNEL);
423 if (!rs_resp)
424 return -ENOMEM;
425
426 ipmi->rx_msg_data = rs_resp;
427 ipmi->rx_msg_len = rs_size;
428
429 aem_send_message(ipmi);
430
431 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
432 if (!res) {
433 res = -ETIMEDOUT;
434 goto out;
435 }
436
437 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
438 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
439 res = -ENOENT;
440 goto out;
441 }
442
443 switch (size) {
444 case 1: {
445 u8 *x = buf;
446 *x = rs_resp->bytes[0];
447 break;
448 }
449 case 2: {
450 u16 *x = buf;
451 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
452 break;
453 }
454 case 4: {
455 u32 *x = buf;
456 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
457 break;
458 }
459 case 8: {
460 u64 *x = buf;
461 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
462 break;
463 }
464 }
465 res = 0;
466
467 out:
468 kfree(rs_resp);
469 return res;
470 }
471
472 /* Update AEM energy registers */
473 static void update_aem_energy_one(struct aem_data *data, int which)
474 {
475 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
476 &data->energy[which], 8);
477 }
478
479 static void update_aem_energy(struct aem_data *data)
480 {
481 update_aem_energy_one(data, 0);
482 if (data->ver_major < 2)
483 return;
484 update_aem_energy_one(data, 1);
485 }
486
487 /* Update all AEM1 sensors */
488 static void update_aem1_sensors(struct aem_data *data)
489 {
490 mutex_lock(&data->lock);
491 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
492 data->valid)
493 goto out;
494
495 update_aem_energy(data);
496 out:
497 mutex_unlock(&data->lock);
498 }
499
500 /* Update all AEM2 sensors */
501 static void update_aem2_sensors(struct aem_data *data)
502 {
503 int i;
504
505 mutex_lock(&data->lock);
506 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
507 data->valid)
508 goto out;
509
510 update_aem_energy(data);
511 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
512 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
513
514 for (i = POWER_CAP; i <= POWER_AUX; i++)
515 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
516 &data->pcap[i], 2);
517 out:
518 mutex_unlock(&data->lock);
519 }
520
521 /* Delete an AEM instance */
522 static void aem_delete(struct aem_data *data)
523 {
524 list_del(&data->list);
525 aem_remove_sensors(data);
526 hwmon_device_unregister(data->hwmon_dev);
527 ipmi_destroy_user(data->ipmi.user);
528 dev_set_drvdata(&data->pdev->dev, NULL);
529 platform_device_unregister(data->pdev);
530 aem_idr_put(data->id);
531 kfree(data);
532 }
533
534 /* Probe functions for AEM1 devices */
535
536 /* Retrieve version and module handle for an AEM1 instance */
537 static int aem_find_aem1_count(struct aem_ipmi_data *data)
538 {
539 int res;
540 struct aem_find_firmware_req ff_req;
541 struct aem_find_firmware_resp ff_resp;
542
543 ff_req.id = system_x_id;
544 ff_req.index = 0;
545 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
546
547 data->tx_message.cmd = AEM_FIND_FW_CMD;
548 data->tx_message.data = (char *)&ff_req;
549 data->tx_message.data_len = sizeof(ff_req);
550
551 data->rx_msg_data = &ff_resp;
552 data->rx_msg_len = sizeof(ff_resp);
553
554 aem_send_message(data);
555
556 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
557 if (!res)
558 return -ETIMEDOUT;
559
560 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
561 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
562 return -ENOENT;
563
564 return ff_resp.num_instances;
565 }
566
567 /* Find and initialize one AEM1 instance */
568 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
569 {
570 struct aem_data *data;
571 int i;
572 int res = -ENOMEM;
573
574 data = kzalloc(sizeof(*data), GFP_KERNEL);
575 if (!data)
576 return res;
577 mutex_init(&data->lock);
578
579 /* Copy instance data */
580 data->ver_major = 1;
581 data->ver_minor = 0;
582 data->module_handle = module_handle;
583 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
584 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
585
586 /* Create sub-device for this fw instance */
587 if (aem_idr_get(&data->id))
588 goto id_err;
589
590 data->pdev = platform_device_alloc(DRVNAME, data->id);
591 if (!data->pdev)
592 goto dev_err;
593 data->pdev->dev.driver = &aem_driver.driver;
594
595 res = platform_device_add(data->pdev);
596 if (res)
597 goto ipmi_err;
598
599 dev_set_drvdata(&data->pdev->dev, data);
600
601 /* Set up IPMI interface */
602 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
603 probe->bmc_device))
604 goto ipmi_err;
605
606 /* Register with hwmon */
607 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
608
609 if (IS_ERR(data->hwmon_dev)) {
610 dev_err(&data->pdev->dev, "Unable to register hwmon "
611 "device for IPMI interface %d\n",
612 probe->interface);
613 goto hwmon_reg_err;
614 }
615
616 data->update = update_aem1_sensors;
617
618 /* Find sensors */
619 if (aem1_find_sensors(data))
620 goto sensor_err;
621
622 /* Add to our list of AEM devices */
623 list_add_tail(&data->list, &driver_data.aem_devices);
624
625 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
626 data->ver_major, data->ver_minor,
627 data->module_handle);
628 return 0;
629
630 sensor_err:
631 hwmon_device_unregister(data->hwmon_dev);
632 hwmon_reg_err:
633 ipmi_destroy_user(data->ipmi.user);
634 ipmi_err:
635 dev_set_drvdata(&data->pdev->dev, NULL);
636 platform_device_unregister(data->pdev);
637 dev_err:
638 aem_idr_put(data->id);
639 id_err:
640 kfree(data);
641
642 return res;
643 }
644
645 /* Find and initialize all AEM1 instances */
646 static int aem_init_aem1(struct aem_ipmi_data *probe)
647 {
648 int num, i, err;
649
650 num = aem_find_aem1_count(probe);
651 for (i = 0; i < num; i++) {
652 err = aem_init_aem1_inst(probe, i);
653 if (err) {
654 dev_err(probe->bmc_device,
655 "Error %d initializing AEM1 0x%X\n",
656 err, i);
657 return err;
658 }
659 }
660
661 return 0;
662 }
663
664 /* Probe functions for AEM2 devices */
665
666 /* Retrieve version and module handle for an AEM2 instance */
667 static int aem_find_aem2(struct aem_ipmi_data *data,
668 struct aem_find_instance_resp *fi_resp,
669 int instance_num)
670 {
671 int res;
672 struct aem_find_instance_req fi_req;
673
674 fi_req.id = system_x_id;
675 fi_req.instance_number = instance_num;
676 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
677
678 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
679 data->tx_message.data = (char *)&fi_req;
680 data->tx_message.data_len = sizeof(fi_req);
681
682 data->rx_msg_data = fi_resp;
683 data->rx_msg_len = sizeof(*fi_resp);
684
685 aem_send_message(data);
686
687 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
688 if (!res)
689 return -ETIMEDOUT;
690
691 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
692 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
693 fi_resp->num_instances <= instance_num)
694 return -ENOENT;
695
696 return 0;
697 }
698
699 /* Find and initialize one AEM2 instance */
700 static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
701 struct aem_find_instance_resp *fi_resp)
702 {
703 struct aem_data *data;
704 int i;
705 int res = -ENOMEM;
706
707 data = kzalloc(sizeof(*data), GFP_KERNEL);
708 if (!data)
709 return res;
710 mutex_init(&data->lock);
711
712 /* Copy instance data */
713 data->ver_major = fi_resp->major;
714 data->ver_minor = fi_resp->minor;
715 data->module_handle = fi_resp->module_handle;
716 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
717 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
718
719 /* Create sub-device for this fw instance */
720 if (aem_idr_get(&data->id))
721 goto id_err;
722
723 data->pdev = platform_device_alloc(DRVNAME, data->id);
724 if (!data->pdev)
725 goto dev_err;
726 data->pdev->dev.driver = &aem_driver.driver;
727
728 res = platform_device_add(data->pdev);
729 if (res)
730 goto ipmi_err;
731
732 dev_set_drvdata(&data->pdev->dev, data);
733
734 /* Set up IPMI interface */
735 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
736 probe->bmc_device))
737 goto ipmi_err;
738
739 /* Register with hwmon */
740 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
741
742 if (IS_ERR(data->hwmon_dev)) {
743 dev_err(&data->pdev->dev, "Unable to register hwmon "
744 "device for IPMI interface %d\n",
745 probe->interface);
746 goto hwmon_reg_err;
747 }
748
749 data->update = update_aem2_sensors;
750
751 /* Find sensors */
752 if (aem2_find_sensors(data))
753 goto sensor_err;
754
755 /* Add to our list of AEM devices */
756 list_add_tail(&data->list, &driver_data.aem_devices);
757
758 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
759 data->ver_major, data->ver_minor,
760 data->module_handle);
761 return 0;
762
763 sensor_err:
764 hwmon_device_unregister(data->hwmon_dev);
765 hwmon_reg_err:
766 ipmi_destroy_user(data->ipmi.user);
767 ipmi_err:
768 dev_set_drvdata(&data->pdev->dev, NULL);
769 platform_device_unregister(data->pdev);
770 dev_err:
771 aem_idr_put(data->id);
772 id_err:
773 kfree(data);
774
775 return res;
776 }
777
778 /* Find and initialize all AEM2 instances */
779 static int aem_init_aem2(struct aem_ipmi_data *probe)
780 {
781 struct aem_find_instance_resp fi_resp;
782 int err;
783 int i = 0;
784
785 while (!aem_find_aem2(probe, &fi_resp, i)) {
786 if (fi_resp.major != 2) {
787 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
788 "report this to the maintainer.\n",
789 fi_resp.major);
790 i++;
791 continue;
792 }
793 err = aem_init_aem2_inst(probe, &fi_resp);
794 if (err) {
795 dev_err(probe->bmc_device,
796 "Error %d initializing AEM2 0x%X\n",
797 err, fi_resp.module_handle);
798 return err;
799 }
800 i++;
801 }
802
803 return 0;
804 }
805
806 /* Probe a BMC for AEM firmware instances */
807 static void aem_register_bmc(int iface, struct device *dev)
808 {
809 struct aem_ipmi_data probe;
810
811 if (aem_init_ipmi_data(&probe, iface, dev))
812 return;
813
814 /* Ignore probe errors; they won't cause problems */
815 aem_init_aem1(&probe);
816 aem_init_aem2(&probe);
817
818 ipmi_destroy_user(probe.user);
819 }
820
821 /* Handle BMC deletion */
822 static void aem_bmc_gone(int iface)
823 {
824 struct aem_data *p1, *next1;
825
826 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
827 if (p1->ipmi.interface == iface)
828 aem_delete(p1);
829 }
830
831 /* sysfs support functions */
832
833 /* AEM device name */
834 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
835 char *buf)
836 {
837 struct aem_data *data = dev_get_drvdata(dev);
838
839 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
840 }
841 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
842
843 /* AEM device version */
844 static ssize_t show_version(struct device *dev,
845 struct device_attribute *devattr,
846 char *buf)
847 {
848 struct aem_data *data = dev_get_drvdata(dev);
849
850 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
851 }
852 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
853
854 /* Display power use */
855 static ssize_t aem_show_power(struct device *dev,
856 struct device_attribute *devattr,
857 char *buf)
858 {
859 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
860 struct aem_data *data = dev_get_drvdata(dev);
861 u64 before, after, delta, time;
862 signed long leftover;
863 struct timespec b, a;
864
865 mutex_lock(&data->lock);
866 update_aem_energy_one(data, attr->index);
867 getnstimeofday(&b);
868 before = data->energy[attr->index];
869
870 leftover = schedule_timeout_interruptible(
871 msecs_to_jiffies(data->power_period[attr->index])
872 );
873 if (leftover) {
874 mutex_unlock(&data->lock);
875 return 0;
876 }
877
878 update_aem_energy_one(data, attr->index);
879 getnstimeofday(&a);
880 after = data->energy[attr->index];
881 mutex_unlock(&data->lock);
882
883 time = timespec_to_ns(&a) - timespec_to_ns(&b);
884 delta = (after - before) * UJ_PER_MJ;
885
886 return sprintf(buf, "%llu\n",
887 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
888 }
889
890 /* Display energy use */
891 static ssize_t aem_show_energy(struct device *dev,
892 struct device_attribute *devattr,
893 char *buf)
894 {
895 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
896 struct aem_data *a = dev_get_drvdata(dev);
897 mutex_lock(&a->lock);
898 update_aem_energy_one(a, attr->index);
899 mutex_unlock(&a->lock);
900
901 return sprintf(buf, "%llu\n",
902 (unsigned long long)a->energy[attr->index] * 1000);
903 }
904
905 /* Display power interval registers */
906 static ssize_t aem_show_power_period(struct device *dev,
907 struct device_attribute *devattr,
908 char *buf)
909 {
910 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
911 struct aem_data *a = dev_get_drvdata(dev);
912 a->update(a);
913
914 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
915 }
916
917 /* Set power interval registers */
918 static ssize_t aem_set_power_period(struct device *dev,
919 struct device_attribute *devattr,
920 const char *buf, size_t count)
921 {
922 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
923 struct aem_data *a = dev_get_drvdata(dev);
924 unsigned long temp;
925 int res;
926
927 res = strict_strtoul(buf, 10, &temp);
928 if (res)
929 return res;
930
931 if (temp < AEM_MIN_POWER_INTERVAL)
932 return -EINVAL;
933
934 mutex_lock(&a->lock);
935 a->power_period[attr->index] = temp;
936 mutex_unlock(&a->lock);
937
938 return count;
939 }
940
941 /* Discover sensors on an AEM device */
942 static int aem_register_sensors(struct aem_data *data,
943 struct aem_ro_sensor_template *ro,
944 struct aem_rw_sensor_template *rw)
945 {
946 struct device *dev = &data->pdev->dev;
947 struct sensor_device_attribute *sensors = data->sensors;
948 int err;
949
950 /* Set up read-only sensors */
951 while (ro->label) {
952 sensors->dev_attr.attr.name = ro->label;
953 sensors->dev_attr.attr.mode = S_IRUGO;
954 sensors->dev_attr.show = ro->show;
955 sensors->index = ro->index;
956
957 err = device_create_file(dev, &sensors->dev_attr);
958 if (err) {
959 sensors->dev_attr.attr.name = NULL;
960 goto error;
961 }
962 sensors++;
963 ro++;
964 }
965
966 /* Set up read-write sensors */
967 while (rw->label) {
968 sensors->dev_attr.attr.name = rw->label;
969 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
970 sensors->dev_attr.show = rw->show;
971 sensors->dev_attr.store = rw->set;
972 sensors->index = rw->index;
973
974 err = device_create_file(dev, &sensors->dev_attr);
975 if (err) {
976 sensors->dev_attr.attr.name = NULL;
977 goto error;
978 }
979 sensors++;
980 rw++;
981 }
982
983 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
984 if (err)
985 goto error;
986 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
987 return err;
988
989 error:
990 aem_remove_sensors(data);
991 return err;
992 }
993
994 /* sysfs support functions for AEM2 sensors */
995
996 /* Display temperature use */
997 static ssize_t aem2_show_temp(struct device *dev,
998 struct device_attribute *devattr,
999 char *buf)
1000 {
1001 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1002 struct aem_data *a = dev_get_drvdata(dev);
1003 a->update(a);
1004
1005 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
1006 }
1007
1008 /* Display power-capping registers */
1009 static ssize_t aem2_show_pcap_value(struct device *dev,
1010 struct device_attribute *devattr,
1011 char *buf)
1012 {
1013 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1014 struct aem_data *a = dev_get_drvdata(dev);
1015 a->update(a);
1016
1017 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1018 }
1019
1020 /* Remove sensors attached to an AEM device */
1021 static void aem_remove_sensors(struct aem_data *data)
1022 {
1023 int i;
1024
1025 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1026 if (!data->sensors[i].dev_attr.attr.name)
1027 continue;
1028 device_remove_file(&data->pdev->dev,
1029 &data->sensors[i].dev_attr);
1030 }
1031
1032 device_remove_file(&data->pdev->dev,
1033 &sensor_dev_attr_name.dev_attr);
1034 device_remove_file(&data->pdev->dev,
1035 &sensor_dev_attr_version.dev_attr);
1036 }
1037
1038 /* Sensor probe functions */
1039
1040 /* Description of AEM1 sensors */
1041 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1042 {"energy1_input", aem_show_energy, 0},
1043 {"power1_average", aem_show_power, 0},
1044 {NULL, NULL, 0},
1045 };
1046
1047 static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1048 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1049 {NULL, NULL, NULL, 0},
1050 };
1051
1052 /* Description of AEM2 sensors */
1053 static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1054 {"energy1_input", aem_show_energy, 0},
1055 {"energy2_input", aem_show_energy, 1},
1056 {"power1_average", aem_show_power, 0},
1057 {"power2_average", aem_show_power, 1},
1058 {"temp1_input", aem2_show_temp, 0},
1059 {"temp2_input", aem2_show_temp, 1},
1060
1061 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1062 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1063 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1064 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1065
1066 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1067 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1068 {NULL, NULL, 0},
1069 };
1070
1071 static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1072 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1073 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1074 {NULL, NULL, NULL, 0},
1075 };
1076
1077 /* Set up AEM1 sensor attrs */
1078 static int aem1_find_sensors(struct aem_data *data)
1079 {
1080 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1081 }
1082
1083 /* Set up AEM2 sensor attrs */
1084 static int aem2_find_sensors(struct aem_data *data)
1085 {
1086 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1087 }
1088
1089 /* Module init/exit routines */
1090
1091 static int __init aem_init(void)
1092 {
1093 int res;
1094
1095 res = driver_register(&aem_driver.driver);
1096 if (res) {
1097 printk(KERN_ERR "Can't register aem driver\n");
1098 return res;
1099 }
1100
1101 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1102 if (res)
1103 goto ipmi_reg_err;
1104 return 0;
1105
1106 ipmi_reg_err:
1107 driver_unregister(&aem_driver.driver);
1108 return res;
1109
1110 }
1111
1112 static void __exit aem_exit(void)
1113 {
1114 struct aem_data *p1, *next1;
1115
1116 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1117 driver_unregister(&aem_driver.driver);
1118 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1119 aem_delete(p1);
1120 }
1121
1122 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1123 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1124 MODULE_LICENSE("GPL");
1125
1126 module_init(aem_init);
1127 module_exit(aem_exit);
1128
1129 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1130 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1131 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1132 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1133 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1134 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1135 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree