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serial: pxa: fine-tune clk useage
[linux/fpc-iii.git] / drivers / hwmon / ibmaem.c
bloba14f634248e72c9c7574bcc6593ac835d66eb19a
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 #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
92 static DEFINE_IDA(aem_ida);
93
94 static struct platform_driver aem_driver = {
95 .driver = {
96 .name = DRVNAME,
97 .bus = &platform_bus_type,
98 }
99 };
100
101 struct 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
118 struct 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
126 struct 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
137 struct 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 */
187 struct aem_iana_id {
188 u8 bytes[3];
189 };
190 static struct aem_iana_id system_x_id = {
191 .bytes = {0x4D, 0x4F, 0x00}
192 };
193
194 /* These are used to find AEM1 instances */
195 struct aem_find_firmware_req {
196 struct aem_iana_id id;
197 u8 rsvd;
198 __be16 index;
199 __be16 module_type_id;
200 } __packed;
201
202 struct 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 */
208 struct aem_find_instance_req {
209 struct aem_iana_id id;
210 u8 instance_number;
211 __be16 module_type_id;
212 } __packed;
213
214 struct 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 */
224 struct 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
233 struct 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 */
239 struct 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
245 static void aem_register_bmc(int iface, struct device *dev);
246 static void aem_bmc_gone(int iface);
247 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
248
249 static void aem_remove_sensors(struct aem_data *data);
250 static int aem1_find_sensors(struct aem_data *data);
251 static int aem2_find_sensors(struct aem_data *data);
252 static void update_aem1_sensors(struct aem_data *data);
253 static void update_aem2_sensors(struct aem_data *data);
254
255 static 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 */
270 static 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, "Unable to register user with IPMI "
293 "interface %d\n", data->interface);
294 return -EACCES;
295 }
296
297 return 0;
298 }
299
300 /* Send an IPMI command */
301 static int aem_send_message(struct aem_ipmi_data *data)
302 {
303 int err;
304
305 err = ipmi_validate_addr(&data->address, sizeof(data->address));
306 if (err)
307 goto out;
308
309 data->tx_msgid++;
310 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
311 &data->tx_message, data, 0, 0, 0);
312 if (err)
313 goto out1;
314
315 return 0;
316 out1:
317 dev_err(data->bmc_device, "request_settime=%x\n", err);
318 return err;
319 out:
320 dev_err(data->bmc_device, "validate_addr=%x\n", err);
321 return err;
322 }
323
324 /* Dispatch IPMI messages to callers */
325 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
326 {
327 unsigned short rx_len;
328 struct aem_ipmi_data *data = user_msg_data;
329
330 if (msg->msgid != data->tx_msgid) {
331 dev_err(data->bmc_device, "Mismatch between received msgid "
332 "(%02x) and transmitted msgid (%02x)!\n",
333 (int)msg->msgid,
334 (int)data->tx_msgid);
335 ipmi_free_recv_msg(msg);
336 return;
337 }
338
339 data->rx_recv_type = msg->recv_type;
340 if (msg->msg.data_len > 0)
341 data->rx_result = msg->msg.data[0];
342 else
343 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
344
345 if (msg->msg.data_len > 1) {
346 rx_len = msg->msg.data_len - 1;
347 if (data->rx_msg_len < rx_len)
348 rx_len = data->rx_msg_len;
349 data->rx_msg_len = rx_len;
350 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
351 } else
352 data->rx_msg_len = 0;
353
354 ipmi_free_recv_msg(msg);
355 complete(&data->read_complete);
356 }
357
358 /* Sensor support functions */
359
360 /* Read a sensor value; must be called with data->lock held */
361 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
362 void *buf, size_t size)
363 {
364 int rs_size, res;
365 struct aem_read_sensor_req rs_req;
366 /* Use preallocated rx buffer */
367 struct aem_read_sensor_resp *rs_resp = data->rs_resp;
368 struct aem_ipmi_data *ipmi = &data->ipmi;
369
370 /* AEM registers are 1, 2, 4 or 8 bytes */
371 switch (size) {
372 case 1:
373 case 2:
374 case 4:
375 case 8:
376 break;
377 default:
378 return -EINVAL;
379 }
380
381 rs_req.id = system_x_id;
382 rs_req.module_handle = data->module_handle;
383 rs_req.element = elt;
384 rs_req.subcommand = AEM_READ_REGISTER;
385 rs_req.reg = reg;
386 rs_req.rx_buf_size = size;
387
388 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
389 ipmi->tx_message.data = (char *)&rs_req;
390 ipmi->tx_message.data_len = sizeof(rs_req);
391
392 rs_size = sizeof(*rs_resp) + size;
393 ipmi->rx_msg_data = rs_resp;
394 ipmi->rx_msg_len = rs_size;
395
396 aem_send_message(ipmi);
397
398 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
399 if (!res) {
400 res = -ETIMEDOUT;
401 goto out;
402 }
403
404 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
405 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
406 res = -ENOENT;
407 goto out;
408 }
409
410 switch (size) {
411 case 1: {
412 u8 *x = buf;
413 *x = rs_resp->bytes[0];
414 break;
415 }
416 case 2: {
417 u16 *x = buf;
418 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
419 break;
420 }
421 case 4: {
422 u32 *x = buf;
423 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
424 break;
425 }
426 case 8: {
427 u64 *x = buf;
428 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
429 break;
430 }
431 }
432 res = 0;
433
434 out:
435 return res;
436 }
437
438 /* Update AEM energy registers */
439 static void update_aem_energy_one(struct aem_data *data, int which)
440 {
441 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
442 &data->energy[which], 8);
443 }
444
445 static void update_aem_energy(struct aem_data *data)
446 {
447 update_aem_energy_one(data, 0);
448 if (data->ver_major < 2)
449 return;
450 update_aem_energy_one(data, 1);
451 }
452
453 /* Update all AEM1 sensors */
454 static void update_aem1_sensors(struct aem_data *data)
455 {
456 mutex_lock(&data->lock);
457 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
458 data->valid)
459 goto out;
460
461 update_aem_energy(data);
462 out:
463 mutex_unlock(&data->lock);
464 }
465
466 /* Update all AEM2 sensors */
467 static void update_aem2_sensors(struct aem_data *data)
468 {
469 int i;
470
471 mutex_lock(&data->lock);
472 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
473 data->valid)
474 goto out;
475
476 update_aem_energy(data);
477 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
478 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
479
480 for (i = POWER_CAP; i <= POWER_AUX; i++)
481 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
482 &data->pcap[i], 2);
483 out:
484 mutex_unlock(&data->lock);
485 }
486
487 /* Delete an AEM instance */
488 static void aem_delete(struct aem_data *data)
489 {
490 list_del(&data->list);
491 aem_remove_sensors(data);
492 kfree(data->rs_resp);
493 hwmon_device_unregister(data->hwmon_dev);
494 ipmi_destroy_user(data->ipmi.user);
495 platform_set_drvdata(data->pdev, NULL);
496 platform_device_unregister(data->pdev);
497 ida_simple_remove(&aem_ida, data->id);
498 kfree(data);
499 }
500
501 /* Probe functions for AEM1 devices */
502
503 /* Retrieve version and module handle for an AEM1 instance */
504 static int aem_find_aem1_count(struct aem_ipmi_data *data)
505 {
506 int res;
507 struct aem_find_firmware_req ff_req;
508 struct aem_find_firmware_resp ff_resp;
509
510 ff_req.id = system_x_id;
511 ff_req.index = 0;
512 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
513
514 data->tx_message.cmd = AEM_FIND_FW_CMD;
515 data->tx_message.data = (char *)&ff_req;
516 data->tx_message.data_len = sizeof(ff_req);
517
518 data->rx_msg_data = &ff_resp;
519 data->rx_msg_len = sizeof(ff_resp);
520
521 aem_send_message(data);
522
523 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
524 if (!res)
525 return -ETIMEDOUT;
526
527 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
528 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
529 return -ENOENT;
530
531 return ff_resp.num_instances;
532 }
533
534 /* Find and initialize one AEM1 instance */
535 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
536 {
537 struct aem_data *data;
538 int i;
539 int res = -ENOMEM;
540
541 data = kzalloc(sizeof(*data), GFP_KERNEL);
542 if (!data)
543 return res;
544 mutex_init(&data->lock);
545
546 /* Copy instance data */
547 data->ver_major = 1;
548 data->ver_minor = 0;
549 data->module_handle = module_handle;
550 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
551 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
552
553 /* Create sub-device for this fw instance */
554 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
555 if (data->id < 0)
556 goto id_err;
557
558 data->pdev = platform_device_alloc(DRVNAME, data->id);
559 if (!data->pdev)
560 goto dev_err;
561 data->pdev->dev.driver = &aem_driver.driver;
562
563 res = platform_device_add(data->pdev);
564 if (res)
565 goto ipmi_err;
566
567 platform_set_drvdata(data->pdev, data);
568
569 /* Set up IPMI interface */
570 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
571 probe->bmc_device);
572 if (res)
573 goto ipmi_err;
574
575 /* Register with hwmon */
576 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
577 if (IS_ERR(data->hwmon_dev)) {
578 dev_err(&data->pdev->dev, "Unable to register hwmon "
579 "device for IPMI interface %d\n",
580 probe->interface);
581 res = PTR_ERR(data->hwmon_dev);
582 goto hwmon_reg_err;
583 }
584
585 data->update = update_aem1_sensors;
586 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
587 if (!data->rs_resp) {
588 res = -ENOMEM;
589 goto alloc_resp_err;
590 }
591
592 /* Find sensors */
593 res = aem1_find_sensors(data);
594 if (res)
595 goto sensor_err;
596
597 /* Add to our list of AEM devices */
598 list_add_tail(&data->list, &driver_data.aem_devices);
599
600 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
601 data->ver_major, data->ver_minor,
602 data->module_handle);
603 return 0;
604
605 sensor_err:
606 kfree(data->rs_resp);
607 alloc_resp_err:
608 hwmon_device_unregister(data->hwmon_dev);
609 hwmon_reg_err:
610 ipmi_destroy_user(data->ipmi.user);
611 ipmi_err:
612 platform_set_drvdata(data->pdev, NULL);
613 platform_device_unregister(data->pdev);
614 dev_err:
615 ida_simple_remove(&aem_ida, data->id);
616 id_err:
617 kfree(data);
618
619 return res;
620 }
621
622 /* Find and initialize all AEM1 instances */
623 static void aem_init_aem1(struct aem_ipmi_data *probe)
624 {
625 int num, i, err;
626
627 num = aem_find_aem1_count(probe);
628 for (i = 0; i < num; i++) {
629 err = aem_init_aem1_inst(probe, i);
630 if (err) {
631 dev_err(probe->bmc_device,
632 "Error %d initializing AEM1 0x%X\n",
633 err, i);
634 }
635 }
636 }
637
638 /* Probe functions for AEM2 devices */
639
640 /* Retrieve version and module handle for an AEM2 instance */
641 static int aem_find_aem2(struct aem_ipmi_data *data,
642 struct aem_find_instance_resp *fi_resp,
643 int instance_num)
644 {
645 int res;
646 struct aem_find_instance_req fi_req;
647
648 fi_req.id = system_x_id;
649 fi_req.instance_number = instance_num;
650 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
651
652 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
653 data->tx_message.data = (char *)&fi_req;
654 data->tx_message.data_len = sizeof(fi_req);
655
656 data->rx_msg_data = fi_resp;
657 data->rx_msg_len = sizeof(*fi_resp);
658
659 aem_send_message(data);
660
661 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
662 if (!res)
663 return -ETIMEDOUT;
664
665 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
666 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
667 fi_resp->num_instances <= instance_num)
668 return -ENOENT;
669
670 return 0;
671 }
672
673 /* Find and initialize one AEM2 instance */
674 static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
675 struct aem_find_instance_resp *fi_resp)
676 {
677 struct aem_data *data;
678 int i;
679 int res = -ENOMEM;
680
681 data = kzalloc(sizeof(*data), GFP_KERNEL);
682 if (!data)
683 return res;
684 mutex_init(&data->lock);
685
686 /* Copy instance data */
687 data->ver_major = fi_resp->major;
688 data->ver_minor = fi_resp->minor;
689 data->module_handle = fi_resp->module_handle;
690 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
691 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
692
693 /* Create sub-device for this fw instance */
694 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
695 if (data->id < 0)
696 goto id_err;
697
698 data->pdev = platform_device_alloc(DRVNAME, data->id);
699 if (!data->pdev)
700 goto dev_err;
701 data->pdev->dev.driver = &aem_driver.driver;
702
703 res = platform_device_add(data->pdev);
704 if (res)
705 goto ipmi_err;
706
707 platform_set_drvdata(data->pdev, data);
708
709 /* Set up IPMI interface */
710 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
711 probe->bmc_device);
712 if (res)
713 goto ipmi_err;
714
715 /* Register with hwmon */
716 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
717 if (IS_ERR(data->hwmon_dev)) {
718 dev_err(&data->pdev->dev, "Unable to register hwmon "
719 "device for IPMI interface %d\n",
720 probe->interface);
721 res = PTR_ERR(data->hwmon_dev);
722 goto hwmon_reg_err;
723 }
724
725 data->update = update_aem2_sensors;
726 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
727 if (!data->rs_resp) {
728 res = -ENOMEM;
729 goto alloc_resp_err;
730 }
731
732 /* Find sensors */
733 res = aem2_find_sensors(data);
734 if (res)
735 goto sensor_err;
736
737 /* Add to our list of AEM devices */
738 list_add_tail(&data->list, &driver_data.aem_devices);
739
740 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
741 data->ver_major, data->ver_minor,
742 data->module_handle);
743 return 0;
744
745 sensor_err:
746 kfree(data->rs_resp);
747 alloc_resp_err:
748 hwmon_device_unregister(data->hwmon_dev);
749 hwmon_reg_err:
750 ipmi_destroy_user(data->ipmi.user);
751 ipmi_err:
752 platform_set_drvdata(data->pdev, NULL);
753 platform_device_unregister(data->pdev);
754 dev_err:
755 ida_simple_remove(&aem_ida, data->id);
756 id_err:
757 kfree(data);
758
759 return res;
760 }
761
762 /* Find and initialize all AEM2 instances */
763 static void aem_init_aem2(struct aem_ipmi_data *probe)
764 {
765 struct aem_find_instance_resp fi_resp;
766 int err;
767 int i = 0;
768
769 while (!aem_find_aem2(probe, &fi_resp, i)) {
770 if (fi_resp.major != 2) {
771 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
772 "report this to the maintainer.\n",
773 fi_resp.major);
774 i++;
775 continue;
776 }
777 err = aem_init_aem2_inst(probe, &fi_resp);
778 if (err) {
779 dev_err(probe->bmc_device,
780 "Error %d initializing AEM2 0x%X\n",
781 err, fi_resp.module_handle);
782 }
783 i++;
784 }
785 }
786
787 /* Probe a BMC for AEM firmware instances */
788 static void aem_register_bmc(int iface, struct device *dev)
789 {
790 struct aem_ipmi_data probe;
791
792 if (aem_init_ipmi_data(&probe, iface, dev))
793 return;
794
795 /* Ignore probe errors; they won't cause problems */
796 aem_init_aem1(&probe);
797 aem_init_aem2(&probe);
798
799 ipmi_destroy_user(probe.user);
800 }
801
802 /* Handle BMC deletion */
803 static void aem_bmc_gone(int iface)
804 {
805 struct aem_data *p1, *next1;
806
807 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
808 if (p1->ipmi.interface == iface)
809 aem_delete(p1);
810 }
811
812 /* sysfs support functions */
813
814 /* AEM device name */
815 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
816 char *buf)
817 {
818 struct aem_data *data = dev_get_drvdata(dev);
819
820 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
821 }
822 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
823
824 /* AEM device version */
825 static ssize_t show_version(struct device *dev,
826 struct device_attribute *devattr,
827 char *buf)
828 {
829 struct aem_data *data = dev_get_drvdata(dev);
830
831 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
832 }
833 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
834
835 /* Display power use */
836 static ssize_t aem_show_power(struct device *dev,
837 struct device_attribute *devattr,
838 char *buf)
839 {
840 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
841 struct aem_data *data = dev_get_drvdata(dev);
842 u64 before, after, delta, time;
843 signed long leftover;
844 struct timespec b, a;
845
846 mutex_lock(&data->lock);
847 update_aem_energy_one(data, attr->index);
848 getnstimeofday(&b);
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 getnstimeofday(&a);
861 after = data->energy[attr->index];
862 mutex_unlock(&data->lock);
863
864 time = timespec_to_ns(&a) - timespec_to_ns(&b);
865 delta = (after - before) * UJ_PER_MJ;
866
867 return sprintf(buf, "%llu\n",
868 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
869 }
870
871 /* Display energy use */
872 static ssize_t aem_show_energy(struct device *dev,
873 struct device_attribute *devattr,
874 char *buf)
875 {
876 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
877 struct aem_data *a = dev_get_drvdata(dev);
878 mutex_lock(&a->lock);
879 update_aem_energy_one(a, attr->index);
880 mutex_unlock(&a->lock);
881
882 return sprintf(buf, "%llu\n",
883 (unsigned long long)a->energy[attr->index] * 1000);
884 }
885
886 /* Display power interval registers */
887 static ssize_t aem_show_power_period(struct device *dev,
888 struct device_attribute *devattr,
889 char *buf)
890 {
891 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
892 struct aem_data *a = dev_get_drvdata(dev);
893 a->update(a);
894
895 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
896 }
897
898 /* Set power interval registers */
899 static ssize_t aem_set_power_period(struct device *dev,
900 struct device_attribute *devattr,
901 const char *buf, size_t count)
902 {
903 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
904 struct aem_data *a = dev_get_drvdata(dev);
905 unsigned long temp;
906 int res;
907
908 res = kstrtoul(buf, 10, &temp);
909 if (res)
910 return res;
911
912 if (temp < AEM_MIN_POWER_INTERVAL)
913 return -EINVAL;
914
915 mutex_lock(&a->lock);
916 a->power_period[attr->index] = temp;
917 mutex_unlock(&a->lock);
918
919 return count;
920 }
921
922 /* Discover sensors on an AEM device */
923 static int aem_register_sensors(struct aem_data *data,
924 struct aem_ro_sensor_template *ro,
925 struct aem_rw_sensor_template *rw)
926 {
927 struct device *dev = &data->pdev->dev;
928 struct sensor_device_attribute *sensors = data->sensors;
929 int err;
930
931 /* Set up read-only sensors */
932 while (ro->label) {
933 sysfs_attr_init(&sensors->dev_attr.attr);
934 sensors->dev_attr.attr.name = ro->label;
935 sensors->dev_attr.attr.mode = S_IRUGO;
936 sensors->dev_attr.show = ro->show;
937 sensors->index = ro->index;
938
939 err = device_create_file(dev, &sensors->dev_attr);
940 if (err) {
941 sensors->dev_attr.attr.name = NULL;
942 goto error;
943 }
944 sensors++;
945 ro++;
946 }
947
948 /* Set up read-write sensors */
949 while (rw->label) {
950 sysfs_attr_init(&sensors->dev_attr.attr);
951 sensors->dev_attr.attr.name = rw->label;
952 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
953 sensors->dev_attr.show = rw->show;
954 sensors->dev_attr.store = rw->set;
955 sensors->index = rw->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 rw++;
964 }
965
966 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
967 if (err)
968 goto error;
969 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
970 return err;
971
972 error:
973 aem_remove_sensors(data);
974 return err;
975 }
976
977 /* sysfs support functions for AEM2 sensors */
978
979 /* Display temperature use */
980 static ssize_t aem2_show_temp(struct device *dev,
981 struct device_attribute *devattr,
982 char *buf)
983 {
984 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
985 struct aem_data *a = dev_get_drvdata(dev);
986 a->update(a);
987
988 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
989 }
990
991 /* Display power-capping registers */
992 static ssize_t aem2_show_pcap_value(struct device *dev,
993 struct device_attribute *devattr,
994 char *buf)
995 {
996 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
997 struct aem_data *a = dev_get_drvdata(dev);
998 a->update(a);
999
1000 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1001 }
1002
1003 /* Remove sensors attached to an AEM device */
1004 static void aem_remove_sensors(struct aem_data *data)
1005 {
1006 int i;
1007
1008 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1009 if (!data->sensors[i].dev_attr.attr.name)
1010 continue;
1011 device_remove_file(&data->pdev->dev,
1012 &data->sensors[i].dev_attr);
1013 }
1014
1015 device_remove_file(&data->pdev->dev,
1016 &sensor_dev_attr_name.dev_attr);
1017 device_remove_file(&data->pdev->dev,
1018 &sensor_dev_attr_version.dev_attr);
1019 }
1020
1021 /* Sensor probe functions */
1022
1023 /* Description of AEM1 sensors */
1024 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1025 {"energy1_input", aem_show_energy, 0},
1026 {"power1_average", aem_show_power, 0},
1027 {NULL, NULL, 0},
1028 };
1029
1030 static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1031 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1032 {NULL, NULL, NULL, 0},
1033 };
1034
1035 /* Description of AEM2 sensors */
1036 static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1037 {"energy1_input", aem_show_energy, 0},
1038 {"energy2_input", aem_show_energy, 1},
1039 {"power1_average", aem_show_power, 0},
1040 {"power2_average", aem_show_power, 1},
1041 {"temp1_input", aem2_show_temp, 0},
1042 {"temp2_input", aem2_show_temp, 1},
1043
1044 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1045 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1046 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1047 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1048
1049 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1050 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1051 {NULL, NULL, 0},
1052 };
1053
1054 static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1055 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1056 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1057 {NULL, NULL, NULL, 0},
1058 };
1059
1060 /* Set up AEM1 sensor attrs */
1061 static int aem1_find_sensors(struct aem_data *data)
1062 {
1063 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1064 }
1065
1066 /* Set up AEM2 sensor attrs */
1067 static int aem2_find_sensors(struct aem_data *data)
1068 {
1069 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1070 }
1071
1072 /* Module init/exit routines */
1073
1074 static int __init aem_init(void)
1075 {
1076 int res;
1077
1078 res = driver_register(&aem_driver.driver);
1079 if (res) {
1080 pr_err("Can't register aem driver\n");
1081 return res;
1082 }
1083
1084 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1085 if (res)
1086 goto ipmi_reg_err;
1087 return 0;
1088
1089 ipmi_reg_err:
1090 driver_unregister(&aem_driver.driver);
1091 return res;
1092
1093 }
1094
1095 static void __exit aem_exit(void)
1096 {
1097 struct aem_data *p1, *next1;
1098
1099 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1100 driver_unregister(&aem_driver.driver);
1101 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1102 aem_delete(p1);
1103 }
1104
1105 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1106 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1107 MODULE_LICENSE("GPL");
1108
1109 module_init(aem_init);
1110 module_exit(aem_exit);
1111
1112 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1113 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1114 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1115 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1116 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1117 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1118 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");
Linux with added FPC-III support