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ibmaem: prevent infinite probing loop on x3650 M2 systems
[net-next-2.6.git] / drivers / hwmon / ibmaem.c
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8808a793 1/*
eb93b7df
DW		 2 * A hwmon driver for the IBM System Director Active Energy Manager (AEM)
3 * temperature/power/energy sensors and capping functionality.
8808a793
DW		 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
88static DEFINE_IDR(aem_idr);
89static DEFINE_SPINLOCK(aem_idr_lock);
90
91static struct device_driver aem_driver = {
92 .name = DRVNAME,
93 .bus = &platform_bus_type,
94};
95
96struct aem_ipmi_data {
97 struct completion read_complete;
98 struct ipmi_addr address;
99 ipmi_user_t user;
100 int interface;
101
102 struct kernel_ipmi_msg tx_message;
103 long tx_msgid;
104
105 void *rx_msg_data;
106 unsigned short rx_msg_len;
107 unsigned char rx_result;
108 int rx_recv_type;
109
110 struct device *bmc_device;
111};
112
113struct aem_ro_sensor_template {
114 char *label;
115 ssize_t (*show)(struct device *dev,
116 struct device_attribute *devattr,
117 char *buf);
118 int index;
119};
120
121struct aem_rw_sensor_template {
122 char *label;
123 ssize_t (*show)(struct device *dev,
124 struct device_attribute *devattr,
125 char *buf);
126 ssize_t (*set)(struct device *dev,
127 struct device_attribute *devattr,
128 const char *buf, size_t count);
129 int index;
130};
131
132struct aem_data {
133 struct list_head list;
134
135 struct device *hwmon_dev;
136 struct platform_device *pdev;
137 struct mutex lock;
138 char valid;
139 unsigned long last_updated; /* In jiffies */
140 u8 ver_major;
141 u8 ver_minor;
142 u8 module_handle;
143 int id;
144 struct aem_ipmi_data ipmi;
145
146 /* Function to update sensors */
147 void (*update)(struct aem_data *data);
148
149 /*
150 * AEM 1.x sensors:
151 * Available sensors:
152 * Energy meter
153 * Power meter
154 *
155 * AEM 2.x sensors:
156 * Two energy meters
157 * Two power meters
158 * Two temperature sensors
159 * Six power cap registers
160 */
161
162 /* sysfs attrs */
163 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
164
165 /* energy use in mJ */
166 u64 energy[AEM_NUM_ENERGY_REGS];
167
168 /* power sampling interval in ms */
169 unsigned long power_period[AEM_NUM_ENERGY_REGS];
170
171 /* Everything past here is for AEM2 only */
172
173 /* power caps in dW */
174 u16 pcap[AEM2_NUM_PCAP_REGS];
175
176 /* exhaust temperature in C */
177 u8 temp[AEM2_NUM_TEMP_REGS];
178};
179
180/* Data structures returned by the AEM firmware */
181struct aem_iana_id {
182 u8 bytes[3];
183};
184static struct aem_iana_id system_x_id = {
185 .bytes = {0x4D, 0x4F, 0x00}
186};
187
188/* These are used to find AEM1 instances */
189struct aem_find_firmware_req {
190 struct aem_iana_id id;
191 u8 rsvd;
a064d5bd
AV		 192 __be16 index;
193 __be16 module_type_id;
8808a793
DW		 194} __packed;
195
196struct aem_find_firmware_resp {
197 struct aem_iana_id id;
198 u8 num_instances;
199} __packed;
200
201/* These are used to find AEM2 instances */
202struct aem_find_instance_req {
203 struct aem_iana_id id;
204 u8 instance_number;
a064d5bd 205 __be16 module_type_id;
8808a793
DW		 206} __packed;
207
208struct aem_find_instance_resp {
209 struct aem_iana_id id;
210 u8 num_instances;
211 u8 major;
212 u8 minor;
213 u8 module_handle;
214 u16 record_id;
215} __packed;
216
217/* These are used to query sensors */
218struct aem_read_sensor_req {
219 struct aem_iana_id id;
220 u8 module_handle;
221 u8 element;
222 u8 subcommand;
223 u8 reg;
224 u8 rx_buf_size;
225} __packed;
226
227struct aem_read_sensor_resp {
228 struct aem_iana_id id;
229 u8 bytes[0];
230} __packed;
231
232/* Data structures to talk to the IPMI layer */
233struct aem_driver_data {
234 struct list_head aem_devices;
235 struct ipmi_smi_watcher bmc_events;
236 struct ipmi_user_hndl ipmi_hndlrs;
237};
238
239static void aem_register_bmc(int iface, struct device *dev);
240static void aem_bmc_gone(int iface);
241static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
242
243static void aem_remove_sensors(struct aem_data *data);
244static int aem_init_aem1(struct aem_ipmi_data *probe);
245static int aem_init_aem2(struct aem_ipmi_data *probe);
246static int aem1_find_sensors(struct aem_data *data);
247static int aem2_find_sensors(struct aem_data *data);
248static void update_aem1_sensors(struct aem_data *data);
249static void update_aem2_sensors(struct aem_data *data);
250
251static struct aem_driver_data driver_data = {
252 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
253 .bmc_events = {
254 .owner = THIS_MODULE,
255 .new_smi = aem_register_bmc,
256 .smi_gone = aem_bmc_gone,
257 },
258 .ipmi_hndlrs = {
259 .ipmi_recv_hndl = aem_msg_handler,
260 },
261};
262
263/* Functions to talk to the IPMI layer */
264
265/* Initialize IPMI address, message buffers and user data */
266static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
267 struct device *bmc)
268{
269 int err;
270
271 init_completion(&data->read_complete);
272 data->bmc_device = bmc;
273
274 /* Initialize IPMI address */
275 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
276 data->address.channel = IPMI_BMC_CHANNEL;
277 data->address.data[0] = 0;
278 data->interface = iface;
279
280 /* Initialize message buffers */
281 data->tx_msgid = 0;
282 data->tx_message.netfn = AEM_NETFN;
283
284 /* Create IPMI messaging interface user */
285 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
286 data, &data->user);
287 if (err < 0) {
288 dev_err(bmc, "Unable to register user with IPMI "
289 "interface %d\n", data->interface);
290 return -EACCES;
291 }
292
293 return 0;
294}
295
296/* Send an IPMI command */
297static int aem_send_message(struct aem_ipmi_data *data)
298{
299 int err;
300
301 err = ipmi_validate_addr(&data->address, sizeof(data->address));
302 if (err)
303 goto out;
304
305 data->tx_msgid++;
306 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
307 &data->tx_message, data, 0, 0, 0);
308 if (err)
309 goto out1;
310
311 return 0;
312out1:
313 dev_err(data->bmc_device, "request_settime=%x\n", err);
314 return err;
315out:
316 dev_err(data->bmc_device, "validate_addr=%x\n", err);
317 return err;
318}
319
320/* Dispatch IPMI messages to callers */
321static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
322{
323 unsigned short rx_len;
324 struct aem_ipmi_data *data = user_msg_data;
325
326 if (msg->msgid != data->tx_msgid) {
327 dev_err(data->bmc_device, "Mismatch between received msgid "
328 "(%02x) and transmitted msgid (%02x)!\n",
329 (int)msg->msgid,
330 (int)data->tx_msgid);
331 ipmi_free_recv_msg(msg);
332 return;
333 }
334
335 data->rx_recv_type = msg->recv_type;
336 if (msg->msg.data_len > 0)
337 data->rx_result = msg->msg.data[0];
338 else
339 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
340
341 if (msg->msg.data_len > 1) {
342 rx_len = msg->msg.data_len - 1;
343 if (data->rx_msg_len < rx_len)
344 rx_len = data->rx_msg_len;
345 data->rx_msg_len = rx_len;
346 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
347 } else
348 data->rx_msg_len = 0;
349
350 ipmi_free_recv_msg(msg);
351 complete(&data->read_complete);
352}
353
354/* ID functions */
355
356/* Obtain an id */
357static int aem_idr_get(int *id)
358{
359 int i, err;
360
361again:
362 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
363 return -ENOMEM;
364
365 spin_lock(&aem_idr_lock);
366 err = idr_get_new(&aem_idr, NULL, &i);
367 spin_unlock(&aem_idr_lock);
368
369 if (unlikely(err == -EAGAIN))
370 goto again;
371 else if (unlikely(err))
372 return err;
373
374 *id = i & MAX_ID_MASK;
375 return 0;
376}
377
378/* Release an object ID */
379static void aem_idr_put(int id)
380{
381 spin_lock(&aem_idr_lock);
382 idr_remove(&aem_idr, id);
383 spin_unlock(&aem_idr_lock);
384}
385
386/* Sensor support functions */
387
388/* Read a sensor value */
389static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
390 void *buf, size_t size)
391{
392 int rs_size, res;
393 struct aem_read_sensor_req rs_req;
394 struct aem_read_sensor_resp *rs_resp;
395 struct aem_ipmi_data *ipmi = &data->ipmi;
396
397 /* AEM registers are 1, 2, 4 or 8 bytes */
398 switch (size) {
399 case 1:
400 case 2:
401 case 4:
402 case 8:
403 break;
404 default:
405 return -EINVAL;
406 }
407
408 rs_req.id = system_x_id;
409 rs_req.module_handle = data->module_handle;
410 rs_req.element = elt;
411 rs_req.subcommand = AEM_READ_REGISTER;
412 rs_req.reg = reg;
413 rs_req.rx_buf_size = size;
414
415 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
416 ipmi->tx_message.data = (char *)&rs_req;
417 ipmi->tx_message.data_len = sizeof(rs_req);
418
419 rs_size = sizeof(*rs_resp) + size;
420 rs_resp = kzalloc(rs_size, GFP_KERNEL);
421 if (!rs_resp)
422 return -ENOMEM;
423
424 ipmi->rx_msg_data = rs_resp;
425 ipmi->rx_msg_len = rs_size;
426
427 aem_send_message(ipmi);
428
429 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
430 if (!res)
431 return -ETIMEDOUT;
432
433 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
434 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
435 kfree(rs_resp);
436 return -ENOENT;
437 }
438
439 switch (size) {
440 case 1: {
441 u8 *x = buf;
442 *x = rs_resp->bytes[0];
443 break;
444 }
445 case 2: {
446 u16 *x = buf;
a064d5bd 447 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
8808a793
DW		 448 break;
449 }
450 case 4: {
451 u32 *x = buf;
a064d5bd 452 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
8808a793
DW		 453 break;
454 }
455 case 8: {
456 u64 *x = buf;
a064d5bd 457 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
8808a793
DW		 458 break;
459 }
460 }
461
462 return 0;
463}
464
465/* Update AEM energy registers */
466static void update_aem_energy(struct aem_data *data)
467{
468 aem_read_sensor(data, AEM_ENERGY_ELEMENT, 0, &data->energy[0], 8);
469 if (data->ver_major < 2)
470 return;
471 aem_read_sensor(data, AEM_ENERGY_ELEMENT, 1, &data->energy[1], 8);
472}
473
474/* Update all AEM1 sensors */
475static void update_aem1_sensors(struct aem_data *data)
476{
477 mutex_lock(&data->lock);
478 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
479 data->valid)
480 goto out;
481
482 update_aem_energy(data);
483out:
484 mutex_unlock(&data->lock);
485}
486
487/* Update all AEM2 sensors */
488static void update_aem2_sensors(struct aem_data *data)
489{
490 int i;
491
492 mutex_lock(&data->lock);
493 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
494 data->valid)
495 goto out;
496
497 update_aem_energy(data);
498 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
499 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
500
501 for (i = POWER_CAP; i <= POWER_AUX; i++)
502 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
503 &data->pcap[i], 2);
504out:
505 mutex_unlock(&data->lock);
506}
507
508/* Delete an AEM instance */
509static void aem_delete(struct aem_data *data)
510{
511 list_del(&data->list);
512 aem_remove_sensors(data);
513 hwmon_device_unregister(data->hwmon_dev);
514 ipmi_destroy_user(data->ipmi.user);
515 dev_set_drvdata(&data->pdev->dev, NULL);
516 platform_device_unregister(data->pdev);
517 aem_idr_put(data->id);
518 kfree(data);
519}
520
521/* Probe functions for AEM1 devices */
522
523/* Retrieve version and module handle for an AEM1 instance */
524static int aem_find_aem1_count(struct aem_ipmi_data *data)
525{
526 int res;
527 struct aem_find_firmware_req ff_req;
528 struct aem_find_firmware_resp ff_resp;
529
530 ff_req.id = system_x_id;
531 ff_req.index = 0;
532 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
533
534 data->tx_message.cmd = AEM_FIND_FW_CMD;
535 data->tx_message.data = (char *)&ff_req;
536 data->tx_message.data_len = sizeof(ff_req);
537
538 data->rx_msg_data = &ff_resp;
539 data->rx_msg_len = sizeof(ff_resp);
540
541 aem_send_message(data);
542
543 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
544 if (!res)
545 return -ETIMEDOUT;
546
547 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
548 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
549 return -ENOENT;
550
551 return ff_resp.num_instances;
552}
553
554/* Find and initialize one AEM1 instance */
555static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
556{
557 struct aem_data *data;
558 int i;
559 int res = -ENOMEM;
560
561 data = kzalloc(sizeof(*data), GFP_KERNEL);
562 if (!data)
563 return res;
564 mutex_init(&data->lock);
565
566 /* Copy instance data */
567 data->ver_major = 1;
568 data->ver_minor = 0;
569 data->module_handle = module_handle;
570 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
571 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
572
573 /* Create sub-device for this fw instance */
574 if (aem_idr_get(&data->id))
575 goto id_err;
576
577 data->pdev = platform_device_alloc(DRVNAME, data->id);
578 if (!data->pdev)
579 goto dev_err;
580 data->pdev->dev.driver = &aem_driver;
581
582 res = platform_device_add(data->pdev);
583 if (res)
584 goto ipmi_err;
585
586 dev_set_drvdata(&data->pdev->dev, data);
587
588 /* Set up IPMI interface */
589 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
590 probe->bmc_device))
591 goto ipmi_err;
592
593 /* Register with hwmon */
594 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
595
596 if (IS_ERR(data->hwmon_dev)) {
597 dev_err(&data->pdev->dev, "Unable to register hwmon "
598 "device for IPMI interface %d\n",
599 probe->interface);
600 goto hwmon_reg_err;
601 }
602
603 data->update = update_aem1_sensors;
604
605 /* Find sensors */
606 if (aem1_find_sensors(data))
607 goto sensor_err;
608
609 /* Add to our list of AEM devices */
610 list_add_tail(&data->list, &driver_data.aem_devices);
611
612 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
613 data->ver_major, data->ver_minor,
614 data->module_handle);
615 return 0;
616
617sensor_err:
618 hwmon_device_unregister(data->hwmon_dev);
619hwmon_reg_err:
620 ipmi_destroy_user(data->ipmi.user);
621ipmi_err:
622 dev_set_drvdata(&data->pdev->dev, NULL);
623 platform_device_unregister(data->pdev);
624dev_err:
625 aem_idr_put(data->id);
626id_err:
627 kfree(data);
628
629 return res;
630}
631
632/* Find and initialize all AEM1 instances */
633static int aem_init_aem1(struct aem_ipmi_data *probe)
634{
635 int num, i, err;
636
637 num = aem_find_aem1_count(probe);
638 for (i = 0; i < num; i++) {
639 err = aem_init_aem1_inst(probe, i);
640 if (err) {
641 dev_err(probe->bmc_device,
642 "Error %d initializing AEM1 0x%X\n",
643 err, i);
644 return err;
645 }
646 }
647
648 return 0;
649}
650
651/* Probe functions for AEM2 devices */
652
653/* Retrieve version and module handle for an AEM2 instance */
654static int aem_find_aem2(struct aem_ipmi_data *data,
655 struct aem_find_instance_resp *fi_resp,
656 int instance_num)
657{
658 int res;
659 struct aem_find_instance_req fi_req;
660
661 fi_req.id = system_x_id;
662 fi_req.instance_number = instance_num;
663 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
664
665 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
666 data->tx_message.data = (char *)&fi_req;
667 data->tx_message.data_len = sizeof(fi_req);
668
669 data->rx_msg_data = fi_resp;
670 data->rx_msg_len = sizeof(*fi_resp);
671
672 aem_send_message(data);
673
674 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
675 if (!res)
676 return -ETIMEDOUT;
677
678 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
9c5413ea
DW		 679 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
680 fi_resp->num_instances <= instance_num)
8808a793
DW		 681 return -ENOENT;
682
683 return 0;
684}
685
686/* Find and initialize one AEM2 instance */
687static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
688 struct aem_find_instance_resp *fi_resp)
689{
690 struct aem_data *data;
691 int i;
692 int res = -ENOMEM;
693
694 data = kzalloc(sizeof(*data), GFP_KERNEL);
695 if (!data)
696 return res;
697 mutex_init(&data->lock);
698
699 /* Copy instance data */
700 data->ver_major = fi_resp->major;
701 data->ver_minor = fi_resp->minor;
702 data->module_handle = fi_resp->module_handle;
703 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
704 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
705
706 /* Create sub-device for this fw instance */
707 if (aem_idr_get(&data->id))
708 goto id_err;
709
710 data->pdev = platform_device_alloc(DRVNAME, data->id);
711 if (!data->pdev)
712 goto dev_err;
713 data->pdev->dev.driver = &aem_driver;
714
715 res = platform_device_add(data->pdev);
716 if (res)
717 goto ipmi_err;
718
719 dev_set_drvdata(&data->pdev->dev, data);
720
721 /* Set up IPMI interface */
722 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
723 probe->bmc_device))
724 goto ipmi_err;
725
726 /* Register with hwmon */
727 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
728
729 if (IS_ERR(data->hwmon_dev)) {
730 dev_err(&data->pdev->dev, "Unable to register hwmon "
731 "device for IPMI interface %d\n",
732 probe->interface);
733 goto hwmon_reg_err;
734 }
735
736 data->update = update_aem2_sensors;
737
738 /* Find sensors */
739 if (aem2_find_sensors(data))
740 goto sensor_err;
741
742 /* Add to our list of AEM devices */
743 list_add_tail(&data->list, &driver_data.aem_devices);
744
745 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
746 data->ver_major, data->ver_minor,
747 data->module_handle);
748 return 0;
749
750sensor_err:
751 hwmon_device_unregister(data->hwmon_dev);
752hwmon_reg_err:
753 ipmi_destroy_user(data->ipmi.user);
754ipmi_err:
755 dev_set_drvdata(&data->pdev->dev, NULL);
756 platform_device_unregister(data->pdev);
757dev_err:
758 aem_idr_put(data->id);
759id_err:
760 kfree(data);
761
762 return res;
763}
764
765/* Find and initialize all AEM2 instances */
766static int aem_init_aem2(struct aem_ipmi_data *probe)
767{
768 struct aem_find_instance_resp fi_resp;
769 int err;
770 int i = 0;
771
772 while (!aem_find_aem2(probe, &fi_resp, i)) {
773 if (fi_resp.major != 2) {
774 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
775 "report this to the maintainer.\n",
776 fi_resp.major);
777 i++;
778 continue;
779 }
780 err = aem_init_aem2_inst(probe, &fi_resp);
781 if (err) {
782 dev_err(probe->bmc_device,
783 "Error %d initializing AEM2 0x%X\n",
784 err, fi_resp.module_handle);
785 return err;
786 }
787 i++;
788 }
789
790 return 0;
791}
792
793/* Probe a BMC for AEM firmware instances */
794static void aem_register_bmc(int iface, struct device *dev)
795{
796 struct aem_ipmi_data probe;
797
798 if (aem_init_ipmi_data(&probe, iface, dev))
799 return;
800
801 /* Ignore probe errors; they won't cause problems */
802 aem_init_aem1(&probe);
803 aem_init_aem2(&probe);
804
805 ipmi_destroy_user(probe.user);
806}
807
808/* Handle BMC deletion */
809static void aem_bmc_gone(int iface)
810{
811 struct aem_data *p1, *next1;
812
813 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
814 if (p1->ipmi.interface == iface)
815 aem_delete(p1);
816}
817
818/* sysfs support functions */
819
820/* AEM device name */
821static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
822 char *buf)
823{
824 struct aem_data *data = dev_get_drvdata(dev);
825
826 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
827}
828static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
829
830/* AEM device version */
831static ssize_t show_version(struct device *dev,
832 struct device_attribute *devattr,
833 char *buf)
834{
835 struct aem_data *data = dev_get_drvdata(dev);
836
837 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
838}
839static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
840
841/* Display power use */
842static ssize_t aem_show_power(struct device *dev,
843 struct device_attribute *devattr,
844 char *buf)
845{
846 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
847 struct aem_data *data = dev_get_drvdata(dev);
848 u64 before, after, delta, time;
849 signed long leftover;
850 struct timespec b, a;
851
852 mutex_lock(&data->lock);
853 update_aem_energy(data);
854 getnstimeofday(&b);
855 before = data->energy[attr->index];
856
857 leftover = schedule_timeout_interruptible(
858 msecs_to_jiffies(data->power_period[attr->index])
859 );
860 if (leftover) {
861 mutex_unlock(&data->lock);
862 return 0;
863 }
864
865 update_aem_energy(data);
866 getnstimeofday(&a);
867 after = data->energy[attr->index];
868 mutex_unlock(&data->lock);
869
870 time = timespec_to_ns(&a) - timespec_to_ns(&b);
871 delta = (after - before) * UJ_PER_MJ;
872
873 return sprintf(buf, "%llu\n",
874 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
875}
876
877/* Display energy use */
878static ssize_t aem_show_energy(struct device *dev,
879 struct device_attribute *devattr,
880 char *buf)
881{
882 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
883 struct aem_data *a = dev_get_drvdata(dev);
884 a->update(a);
885
886 return sprintf(buf, "%llu\n",
887 (unsigned long long)a->energy[attr->index] * 1000);
888}
889
890/* Display power interval registers */
891static ssize_t aem_show_power_period(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 a->update(a);
898
899 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
900}
901
902/* Set power interval registers */
903static ssize_t aem_set_power_period(struct device *dev,
904 struct device_attribute *devattr,
905 const char *buf, size_t count)
906{
907 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
908 struct aem_data *a = dev_get_drvdata(dev);
909 unsigned long temp;
910 int res;
911
912 res = strict_strtoul(buf, 10, &temp);
913 if (res)
914 return res;
915
916 if (temp < AEM_MIN_POWER_INTERVAL)
917 return -EINVAL;
918
919 mutex_lock(&a->lock);
920 a->power_period[attr->index] = temp;
921 mutex_unlock(&a->lock);
922
923 return count;
924}
925
926/* Discover sensors on an AEM device */
927static int aem_register_sensors(struct aem_data *data,
928 struct aem_ro_sensor_template *ro,
929 struct aem_rw_sensor_template *rw)
930{
931 struct device *dev = &data->pdev->dev;
932 struct sensor_device_attribute *sensors = data->sensors;
933 int err;
934
935 /* Set up read-only sensors */
936 while (ro->label) {
937 sensors->dev_attr.attr.name = ro->label;
938 sensors->dev_attr.attr.mode = S_IRUGO;
939 sensors->dev_attr.show = ro->show;
940 sensors->index = ro->index;
941
942 err = device_create_file(dev, &sensors->dev_attr);
943 if (err) {
944 sensors->dev_attr.attr.name = NULL;
945 goto error;
946 }
947 sensors++;
948 ro++;
949 }
950
951 /* Set up read-write sensors */
952 while (rw->label) {
953 sensors->dev_attr.attr.name = rw->label;
954 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
955 sensors->dev_attr.show = rw->show;
956 sensors->dev_attr.store = rw->set;
957 sensors->index = rw->index;
958
959 err = device_create_file(dev, &sensors->dev_attr);
960 if (err) {
961 sensors->dev_attr.attr.name = NULL;
962 goto error;
963 }
964 sensors++;
965 rw++;
966 }
967
968 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
969 if (err)
970 goto error;
971 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
972 return err;
973
974error:
975 aem_remove_sensors(data);
976 return err;
977}
978
979/* sysfs support functions for AEM2 sensors */
980
981/* Display temperature use */
982static ssize_t aem2_show_temp(struct device *dev,
983 struct device_attribute *devattr,
984 char *buf)
985{
986 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
987 struct aem_data *a = dev_get_drvdata(dev);
988 a->update(a);
989
990 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
991}
992
993/* Display power-capping registers */
994static ssize_t aem2_show_pcap_value(struct device *dev,
995 struct device_attribute *devattr,
996 char *buf)
997{
998 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
999 struct aem_data *a = dev_get_drvdata(dev);
1000 a->update(a);
1001
1002 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1003}
1004
1005/* Remove sensors attached to an AEM device */
1006static void aem_remove_sensors(struct aem_data *data)
1007{
1008 int i;
1009
1010 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1011 if (!data->sensors[i].dev_attr.attr.name)
1012 continue;
1013 device_remove_file(&data->pdev->dev,
1014 &data->sensors[i].dev_attr);
1015 }
1016
1017 device_remove_file(&data->pdev->dev,
1018 &sensor_dev_attr_name.dev_attr);
1019 device_remove_file(&data->pdev->dev,
1020 &sensor_dev_attr_version.dev_attr);
1021}
1022
1023/* Sensor probe functions */
1024
1025/* Description of AEM1 sensors */
1026static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1027{"energy1_input", aem_show_energy, 0},
1028{"power1_average", aem_show_power, 0},
1029{NULL, NULL, 0},
1030};
1031
1032static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1033{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1034{NULL, NULL, NULL, 0},
1035};
1036
1037/* Description of AEM2 sensors */
1038static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1039{"energy1_input", aem_show_energy, 0},
1040{"energy2_input", aem_show_energy, 1},
1041{"power1_average", aem_show_power, 0},
1042{"power2_average", aem_show_power, 1},
1043{"temp1_input", aem2_show_temp, 0},
1044{"temp2_input", aem2_show_temp, 1},
1045
1046{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1047{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1048{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1049{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1050
1051{"power3_average", aem2_show_pcap_value, POWER_AUX},
1052{"power_cap", aem2_show_pcap_value, POWER_CAP},
1053{NULL, NULL, 0},
1054};
1055
1056static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1057{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1058{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1059{NULL, NULL, NULL, 0},
1060};
1061
1062/* Set up AEM1 sensor attrs */
1063static int aem1_find_sensors(struct aem_data *data)
1064{
1065 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1066}
1067
1068/* Set up AEM2 sensor attrs */
1069static int aem2_find_sensors(struct aem_data *data)
1070{
1071 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1072}
1073
1074/* Module init/exit routines */
1075
1076static int __init aem_init(void)
1077{
1078 int res;
1079
1080 res = driver_register(&aem_driver);
1081 if (res) {
1082 printk(KERN_ERR "Can't register aem driver\n");
1083 return res;
1084 }
1085
1086 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1087 if (res)
1088 goto ipmi_reg_err;
1089 return 0;
1090
1091ipmi_reg_err:
1092 driver_unregister(&aem_driver);
1093 return res;
1094
1095}
1096
1097static void __exit aem_exit(void)
1098{
1099 struct aem_data *p1, *next1;
1100
1101 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1102 driver_unregister(&aem_driver);
1103 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1104 aem_delete(p1);
1105}
1106
1107MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
eb93b7df 1108MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
8808a793
DW		 1109MODULE_LICENSE("GPL");
1110
1111module_init(aem_init);
1112module_exit(aem_exit);
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