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