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8808a793 DW |
1 | /* |
2 | * A hwmon driver for the IBM Active Energy Manager temperature/power sensors | |
3 | * and capping functionality. | |
4 | * Copyright (C) 2008 IBM | |
5 | * | |
6 | * Author: Darrick J. Wong <djwong@us.ibm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/ipmi.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/kdev_t.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/idr.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/math64.h> | |
35 | #include <linux/time.h> | |
36 | ||
37 | #define REFRESH_INTERVAL (HZ) | |
38 | #define IPMI_TIMEOUT (30 * HZ) | |
39 | #define DRVNAME "aem" | |
40 | ||
41 | #define AEM_NETFN 0x2E | |
42 | ||
43 | #define AEM_FIND_FW_CMD 0x80 | |
44 | #define AEM_ELEMENT_CMD 0x81 | |
45 | #define AEM_FW_INSTANCE_CMD 0x82 | |
46 | ||
47 | #define AEM_READ_ELEMENT_CFG 0x80 | |
48 | #define AEM_READ_BUFFER 0x81 | |
49 | #define AEM_READ_REGISTER 0x82 | |
50 | #define AEM_WRITE_REGISTER 0x83 | |
51 | #define AEM_SET_REG_MASK 0x84 | |
52 | #define AEM_CLEAR_REG_MASK 0x85 | |
53 | #define AEM_READ_ELEMENT_CFG2 0x86 | |
54 | ||
55 | #define AEM_CONTROL_ELEMENT 0 | |
56 | #define AEM_ENERGY_ELEMENT 1 | |
57 | #define AEM_CLOCK_ELEMENT 4 | |
58 | #define AEM_POWER_CAP_ELEMENT 7 | |
59 | #define AEM_EXHAUST_ELEMENT 9 | |
60 | #define AEM_POWER_ELEMENT 10 | |
61 | ||
62 | #define AEM_MODULE_TYPE_ID 0x0001 | |
63 | ||
64 | #define AEM2_NUM_ENERGY_REGS 2 | |
65 | #define AEM2_NUM_PCAP_REGS 6 | |
66 | #define AEM2_NUM_TEMP_REGS 2 | |
67 | #define AEM2_NUM_SENSORS 14 | |
68 | ||
69 | #define AEM1_NUM_ENERGY_REGS 1 | |
70 | #define AEM1_NUM_SENSORS 3 | |
71 | ||
72 | /* AEM 2.x has more energy registers */ | |
73 | #define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS | |
74 | /* AEM 2.x needs more sensor files */ | |
75 | #define AEM_NUM_SENSORS AEM2_NUM_SENSORS | |
76 | ||
77 | #define POWER_CAP 0 | |
78 | #define POWER_CAP_MAX_HOTPLUG 1 | |
79 | #define POWER_CAP_MAX 2 | |
80 | #define POWER_CAP_MIN_WARNING 3 | |
81 | #define POWER_CAP_MIN 4 | |
82 | #define POWER_AUX 5 | |
83 | ||
84 | #define AEM_DEFAULT_POWER_INTERVAL 1000 | |
85 | #define AEM_MIN_POWER_INTERVAL 200 | |
86 | #define UJ_PER_MJ 1000L | |
87 | ||
88 | static DEFINE_IDR(aem_idr); | |
89 | static DEFINE_SPINLOCK(aem_idr_lock); | |
90 | ||
91 | static struct device_driver aem_driver = { | |
92 | .name = DRVNAME, | |
93 | .bus = &platform_bus_type, | |
94 | }; | |
95 | ||
96 | struct 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 | ||
113 | struct 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 | ||
121 | struct 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 | ||
132 | struct 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 */ | |
181 | struct aem_iana_id { | |
182 | u8 bytes[3]; | |
183 | }; | |
184 | static struct aem_iana_id system_x_id = { | |
185 | .bytes = {0x4D, 0x4F, 0x00} | |
186 | }; | |
187 | ||
188 | /* These are used to find AEM1 instances */ | |
189 | struct 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 | ||
196 | struct 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 */ | |
202 | struct 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 | ||
208 | struct 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 */ | |
218 | struct 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 | ||
227 | struct 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 */ | |
233 | struct 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 | ||
239 | static void aem_register_bmc(int iface, struct device *dev); | |
240 | static void aem_bmc_gone(int iface); | |
241 | static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); | |
242 | ||
243 | static void aem_remove_sensors(struct aem_data *data); | |
244 | static int aem_init_aem1(struct aem_ipmi_data *probe); | |
245 | static int aem_init_aem2(struct aem_ipmi_data *probe); | |
246 | static int aem1_find_sensors(struct aem_data *data); | |
247 | static int aem2_find_sensors(struct aem_data *data); | |
248 | static void update_aem1_sensors(struct aem_data *data); | |
249 | static void update_aem2_sensors(struct aem_data *data); | |
250 | ||
251 | static 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 */ | |
266 | static 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 */ | |
297 | static 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; | |
312 | out1: | |
313 | dev_err(data->bmc_device, "request_settime=%x\n", err); | |
314 | return err; | |
315 | out: | |
316 | dev_err(data->bmc_device, "validate_addr=%x\n", err); | |
317 | return err; | |
318 | } | |
319 | ||
320 | /* Dispatch IPMI messages to callers */ | |
321 | static 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 */ | |
357 | static int aem_idr_get(int *id) | |
358 | { | |
359 | int i, err; | |
360 | ||
361 | again: | |
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 */ | |
379 | static 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 */ | |
389 | static 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 */ | |
466 | static 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 */ | |
475 | static 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); | |
483 | out: | |
484 | mutex_unlock(&data->lock); | |
485 | } | |
486 | ||
487 | /* Update all AEM2 sensors */ | |
488 | static 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); | |
504 | out: | |
505 | mutex_unlock(&data->lock); | |
506 | } | |
507 | ||
508 | /* Delete an AEM instance */ | |
509 | static 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 */ | |
524 | static 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 */ | |
555 | static 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 | ||
617 | sensor_err: | |
618 | hwmon_device_unregister(data->hwmon_dev); | |
619 | hwmon_reg_err: | |
620 | ipmi_destroy_user(data->ipmi.user); | |
621 | ipmi_err: | |
622 | dev_set_drvdata(&data->pdev->dev, NULL); | |
623 | platform_device_unregister(data->pdev); | |
624 | dev_err: | |
625 | aem_idr_put(data->id); | |
626 | id_err: | |
627 | kfree(data); | |
628 | ||
629 | return res; | |
630 | } | |
631 | ||
632 | /* Find and initialize all AEM1 instances */ | |
633 | static 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 */ | |
654 | static 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) || | |
679 | memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id))) | |
680 | return -ENOENT; | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | /* Find and initialize one AEM2 instance */ | |
686 | static int aem_init_aem2_inst(struct aem_ipmi_data *probe, | |
687 | struct aem_find_instance_resp *fi_resp) | |
688 | { | |
689 | struct aem_data *data; | |
690 | int i; | |
691 | int res = -ENOMEM; | |
692 | ||
693 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
694 | if (!data) | |
695 | return res; | |
696 | mutex_init(&data->lock); | |
697 | ||
698 | /* Copy instance data */ | |
699 | data->ver_major = fi_resp->major; | |
700 | data->ver_minor = fi_resp->minor; | |
701 | data->module_handle = fi_resp->module_handle; | |
702 | for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) | |
703 | data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; | |
704 | ||
705 | /* Create sub-device for this fw instance */ | |
706 | if (aem_idr_get(&data->id)) | |
707 | goto id_err; | |
708 | ||
709 | data->pdev = platform_device_alloc(DRVNAME, data->id); | |
710 | if (!data->pdev) | |
711 | goto dev_err; | |
712 | data->pdev->dev.driver = &aem_driver; | |
713 | ||
714 | res = platform_device_add(data->pdev); | |
715 | if (res) | |
716 | goto ipmi_err; | |
717 | ||
718 | dev_set_drvdata(&data->pdev->dev, data); | |
719 | ||
720 | /* Set up IPMI interface */ | |
721 | if (aem_init_ipmi_data(&data->ipmi, probe->interface, | |
722 | probe->bmc_device)) | |
723 | goto ipmi_err; | |
724 | ||
725 | /* Register with hwmon */ | |
726 | data->hwmon_dev = hwmon_device_register(&data->pdev->dev); | |
727 | ||
728 | if (IS_ERR(data->hwmon_dev)) { | |
729 | dev_err(&data->pdev->dev, "Unable to register hwmon " | |
730 | "device for IPMI interface %d\n", | |
731 | probe->interface); | |
732 | goto hwmon_reg_err; | |
733 | } | |
734 | ||
735 | data->update = update_aem2_sensors; | |
736 | ||
737 | /* Find sensors */ | |
738 | if (aem2_find_sensors(data)) | |
739 | goto sensor_err; | |
740 | ||
741 | /* Add to our list of AEM devices */ | |
742 | list_add_tail(&data->list, &driver_data.aem_devices); | |
743 | ||
744 | dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", | |
745 | data->ver_major, data->ver_minor, | |
746 | data->module_handle); | |
747 | return 0; | |
748 | ||
749 | sensor_err: | |
750 | hwmon_device_unregister(data->hwmon_dev); | |
751 | hwmon_reg_err: | |
752 | ipmi_destroy_user(data->ipmi.user); | |
753 | ipmi_err: | |
754 | dev_set_drvdata(&data->pdev->dev, NULL); | |
755 | platform_device_unregister(data->pdev); | |
756 | dev_err: | |
757 | aem_idr_put(data->id); | |
758 | id_err: | |
759 | kfree(data); | |
760 | ||
761 | return res; | |
762 | } | |
763 | ||
764 | /* Find and initialize all AEM2 instances */ | |
765 | static int aem_init_aem2(struct aem_ipmi_data *probe) | |
766 | { | |
767 | struct aem_find_instance_resp fi_resp; | |
768 | int err; | |
769 | int i = 0; | |
770 | ||
771 | while (!aem_find_aem2(probe, &fi_resp, i)) { | |
772 | if (fi_resp.major != 2) { | |
773 | dev_err(probe->bmc_device, "Unknown AEM v%d; please " | |
774 | "report this to the maintainer.\n", | |
775 | fi_resp.major); | |
776 | i++; | |
777 | continue; | |
778 | } | |
779 | err = aem_init_aem2_inst(probe, &fi_resp); | |
780 | if (err) { | |
781 | dev_err(probe->bmc_device, | |
782 | "Error %d initializing AEM2 0x%X\n", | |
783 | err, fi_resp.module_handle); | |
784 | return err; | |
785 | } | |
786 | i++; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | /* Probe a BMC for AEM firmware instances */ | |
793 | static void aem_register_bmc(int iface, struct device *dev) | |
794 | { | |
795 | struct aem_ipmi_data probe; | |
796 | ||
797 | if (aem_init_ipmi_data(&probe, iface, dev)) | |
798 | return; | |
799 | ||
800 | /* Ignore probe errors; they won't cause problems */ | |
801 | aem_init_aem1(&probe); | |
802 | aem_init_aem2(&probe); | |
803 | ||
804 | ipmi_destroy_user(probe.user); | |
805 | } | |
806 | ||
807 | /* Handle BMC deletion */ | |
808 | static void aem_bmc_gone(int iface) | |
809 | { | |
810 | struct aem_data *p1, *next1; | |
811 | ||
812 | list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) | |
813 | if (p1->ipmi.interface == iface) | |
814 | aem_delete(p1); | |
815 | } | |
816 | ||
817 | /* sysfs support functions */ | |
818 | ||
819 | /* AEM device name */ | |
820 | static ssize_t show_name(struct device *dev, struct device_attribute *devattr, | |
821 | char *buf) | |
822 | { | |
823 | struct aem_data *data = dev_get_drvdata(dev); | |
824 | ||
825 | return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); | |
826 | } | |
827 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); | |
828 | ||
829 | /* AEM device version */ | |
830 | static ssize_t show_version(struct device *dev, | |
831 | struct device_attribute *devattr, | |
832 | char *buf) | |
833 | { | |
834 | struct aem_data *data = dev_get_drvdata(dev); | |
835 | ||
836 | return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); | |
837 | } | |
838 | static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); | |
839 | ||
840 | /* Display power use */ | |
841 | static ssize_t aem_show_power(struct device *dev, | |
842 | struct device_attribute *devattr, | |
843 | char *buf) | |
844 | { | |
845 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
846 | struct aem_data *data = dev_get_drvdata(dev); | |
847 | u64 before, after, delta, time; | |
848 | signed long leftover; | |
849 | struct timespec b, a; | |
850 | ||
851 | mutex_lock(&data->lock); | |
852 | update_aem_energy(data); | |
853 | getnstimeofday(&b); | |
854 | before = data->energy[attr->index]; | |
855 | ||
856 | leftover = schedule_timeout_interruptible( | |
857 | msecs_to_jiffies(data->power_period[attr->index]) | |
858 | ); | |
859 | if (leftover) { | |
860 | mutex_unlock(&data->lock); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | update_aem_energy(data); | |
865 | getnstimeofday(&a); | |
866 | after = data->energy[attr->index]; | |
867 | mutex_unlock(&data->lock); | |
868 | ||
869 | time = timespec_to_ns(&a) - timespec_to_ns(&b); | |
870 | delta = (after - before) * UJ_PER_MJ; | |
871 | ||
872 | return sprintf(buf, "%llu\n", | |
873 | (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); | |
874 | } | |
875 | ||
876 | /* Display energy use */ | |
877 | static ssize_t aem_show_energy(struct device *dev, | |
878 | struct device_attribute *devattr, | |
879 | char *buf) | |
880 | { | |
881 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
882 | struct aem_data *a = dev_get_drvdata(dev); | |
883 | a->update(a); | |
884 | ||
885 | return sprintf(buf, "%llu\n", | |
886 | (unsigned long long)a->energy[attr->index] * 1000); | |
887 | } | |
888 | ||
889 | /* Display power interval registers */ | |
890 | static ssize_t aem_show_power_period(struct device *dev, | |
891 | struct device_attribute *devattr, | |
892 | char *buf) | |
893 | { | |
894 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
895 | struct aem_data *a = dev_get_drvdata(dev); | |
896 | a->update(a); | |
897 | ||
898 | return sprintf(buf, "%lu\n", a->power_period[attr->index]); | |
899 | } | |
900 | ||
901 | /* Set power interval registers */ | |
902 | static ssize_t aem_set_power_period(struct device *dev, | |
903 | struct device_attribute *devattr, | |
904 | const char *buf, size_t count) | |
905 | { | |
906 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
907 | struct aem_data *a = dev_get_drvdata(dev); | |
908 | unsigned long temp; | |
909 | int res; | |
910 | ||
911 | res = strict_strtoul(buf, 10, &temp); | |
912 | if (res) | |
913 | return res; | |
914 | ||
915 | if (temp < AEM_MIN_POWER_INTERVAL) | |
916 | return -EINVAL; | |
917 | ||
918 | mutex_lock(&a->lock); | |
919 | a->power_period[attr->index] = temp; | |
920 | mutex_unlock(&a->lock); | |
921 | ||
922 | return count; | |
923 | } | |
924 | ||
925 | /* Discover sensors on an AEM device */ | |
926 | static int aem_register_sensors(struct aem_data *data, | |
927 | struct aem_ro_sensor_template *ro, | |
928 | struct aem_rw_sensor_template *rw) | |
929 | { | |
930 | struct device *dev = &data->pdev->dev; | |
931 | struct sensor_device_attribute *sensors = data->sensors; | |
932 | int err; | |
933 | ||
934 | /* Set up read-only sensors */ | |
935 | while (ro->label) { | |
936 | sensors->dev_attr.attr.name = ro->label; | |
937 | sensors->dev_attr.attr.mode = S_IRUGO; | |
938 | sensors->dev_attr.show = ro->show; | |
939 | sensors->index = ro->index; | |
940 | ||
941 | err = device_create_file(dev, &sensors->dev_attr); | |
942 | if (err) { | |
943 | sensors->dev_attr.attr.name = NULL; | |
944 | goto error; | |
945 | } | |
946 | sensors++; | |
947 | ro++; | |
948 | } | |
949 | ||
950 | /* Set up read-write sensors */ | |
951 | while (rw->label) { | |
952 | sensors->dev_attr.attr.name = rw->label; | |
953 | sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; | |
954 | sensors->dev_attr.show = rw->show; | |
955 | sensors->dev_attr.store = rw->set; | |
956 | sensors->index = rw->index; | |
957 | ||
958 | err = device_create_file(dev, &sensors->dev_attr); | |
959 | if (err) { | |
960 | sensors->dev_attr.attr.name = NULL; | |
961 | goto error; | |
962 | } | |
963 | sensors++; | |
964 | rw++; | |
965 | } | |
966 | ||
967 | err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); | |
968 | if (err) | |
969 | goto error; | |
970 | err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); | |
971 | return err; | |
972 | ||
973 | error: | |
974 | aem_remove_sensors(data); | |
975 | return err; | |
976 | } | |
977 | ||
978 | /* sysfs support functions for AEM2 sensors */ | |
979 | ||
980 | /* Display temperature use */ | |
981 | static ssize_t aem2_show_temp(struct device *dev, | |
982 | struct device_attribute *devattr, | |
983 | char *buf) | |
984 | { | |
985 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
986 | struct aem_data *a = dev_get_drvdata(dev); | |
987 | a->update(a); | |
988 | ||
989 | return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); | |
990 | } | |
991 | ||
992 | /* Display power-capping registers */ | |
993 | static ssize_t aem2_show_pcap_value(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->pcap[attr->index] * 100000); | |
1002 | } | |
1003 | ||
1004 | /* Remove sensors attached to an AEM device */ | |
1005 | static void aem_remove_sensors(struct aem_data *data) | |
1006 | { | |
1007 | int i; | |
1008 | ||
1009 | for (i = 0; i < AEM_NUM_SENSORS; i++) { | |
1010 | if (!data->sensors[i].dev_attr.attr.name) | |
1011 | continue; | |
1012 | device_remove_file(&data->pdev->dev, | |
1013 | &data->sensors[i].dev_attr); | |
1014 | } | |
1015 | ||
1016 | device_remove_file(&data->pdev->dev, | |
1017 | &sensor_dev_attr_name.dev_attr); | |
1018 | device_remove_file(&data->pdev->dev, | |
1019 | &sensor_dev_attr_version.dev_attr); | |
1020 | } | |
1021 | ||
1022 | /* Sensor probe functions */ | |
1023 | ||
1024 | /* Description of AEM1 sensors */ | |
1025 | static struct aem_ro_sensor_template aem1_ro_sensors[] = { | |
1026 | {"energy1_input", aem_show_energy, 0}, | |
1027 | {"power1_average", aem_show_power, 0}, | |
1028 | {NULL, NULL, 0}, | |
1029 | }; | |
1030 | ||
1031 | static struct aem_rw_sensor_template aem1_rw_sensors[] = { | |
1032 | {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, | |
1033 | {NULL, NULL, NULL, 0}, | |
1034 | }; | |
1035 | ||
1036 | /* Description of AEM2 sensors */ | |
1037 | static struct aem_ro_sensor_template aem2_ro_sensors[] = { | |
1038 | {"energy1_input", aem_show_energy, 0}, | |
1039 | {"energy2_input", aem_show_energy, 1}, | |
1040 | {"power1_average", aem_show_power, 0}, | |
1041 | {"power2_average", aem_show_power, 1}, | |
1042 | {"temp1_input", aem2_show_temp, 0}, | |
1043 | {"temp2_input", aem2_show_temp, 1}, | |
1044 | ||
1045 | {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, | |
1046 | {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, | |
1047 | {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, | |
1048 | {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, | |
1049 | ||
1050 | {"power3_average", aem2_show_pcap_value, POWER_AUX}, | |
1051 | {"power_cap", aem2_show_pcap_value, POWER_CAP}, | |
1052 | {NULL, NULL, 0}, | |
1053 | }; | |
1054 | ||
1055 | static struct aem_rw_sensor_template aem2_rw_sensors[] = { | |
1056 | {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, | |
1057 | {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, | |
1058 | {NULL, NULL, NULL, 0}, | |
1059 | }; | |
1060 | ||
1061 | /* Set up AEM1 sensor attrs */ | |
1062 | static int aem1_find_sensors(struct aem_data *data) | |
1063 | { | |
1064 | return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); | |
1065 | } | |
1066 | ||
1067 | /* Set up AEM2 sensor attrs */ | |
1068 | static int aem2_find_sensors(struct aem_data *data) | |
1069 | { | |
1070 | return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); | |
1071 | } | |
1072 | ||
1073 | /* Module init/exit routines */ | |
1074 | ||
1075 | static int __init aem_init(void) | |
1076 | { | |
1077 | int res; | |
1078 | ||
1079 | res = driver_register(&aem_driver); | |
1080 | if (res) { | |
1081 | printk(KERN_ERR "Can't register aem driver\n"); | |
1082 | return res; | |
1083 | } | |
1084 | ||
1085 | res = ipmi_smi_watcher_register(&driver_data.bmc_events); | |
1086 | if (res) | |
1087 | goto ipmi_reg_err; | |
1088 | return 0; | |
1089 | ||
1090 | ipmi_reg_err: | |
1091 | driver_unregister(&aem_driver); | |
1092 | return res; | |
1093 | ||
1094 | } | |
1095 | ||
1096 | static void __exit aem_exit(void) | |
1097 | { | |
1098 | struct aem_data *p1, *next1; | |
1099 | ||
1100 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); | |
1101 | driver_unregister(&aem_driver); | |
1102 | list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) | |
1103 | aem_delete(p1); | |
1104 | } | |
1105 | ||
1106 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
1107 | MODULE_DESCRIPTION("IBM Active Energy Manager power/temp sensor driver"); | |
1108 | MODULE_LICENSE("GPL"); | |
1109 | ||
1110 | module_init(aem_init); | |
1111 | module_exit(aem_exit); |