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x86: fix bootup crash in native_read_tsc()
[wrt350n-kernel.git] / drivers / hwmon / ibmpex.c
blob9c9cdb0685e43511928c400ce89a1205d20ec8c9
1 /*
2 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
3 * Copyright (C) 2007 IBM
4 *
5 * Author: Darrick J. Wong <djwong@us.ibm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/ipmi.h>
23 #include <linux/module.h>
24 #include <linux/hwmon.h>
25 #include <linux/hwmon-sysfs.h>
26 #include <linux/jiffies.h>
27 #include <linux/mutex.h>
28
29 #define REFRESH_INTERVAL (2 * HZ)
30 #define DRVNAME "ibmpex"
31
32 #define PEX_GET_VERSION 1
33 #define PEX_GET_SENSOR_COUNT 2
34 #define PEX_GET_SENSOR_NAME 3
35 #define PEX_RESET_HIGH_LOW 4
36 #define PEX_GET_SENSOR_DATA 6
37
38 #define PEX_NET_FUNCTION 0x3A
39 #define PEX_COMMAND 0x3C
40
41 static inline u16 extract_value(const char *data, int offset)
42 {
43 return be16_to_cpup((u16 *)&data[offset]);
44 }
45
46 #define TEMP_SENSOR 1
47 #define POWER_SENSOR 2
48
49 #define PEX_SENSOR_TYPE_LEN 3
50 static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
51 static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
52
53 #define PEX_MULT_LEN 2
54 static u8 const watt_sensor_sig[] = {0x41, 0x43};
55
56 #define PEX_NUM_SENSOR_FUNCS 3
57 static char const * const power_sensor_name_templates[] = {
58 "%s%d_average",
59 "%s%d_average_lowest",
60 "%s%d_average_highest"
61 };
62 static char const * const temp_sensor_name_templates[] = {
63 "%s%d_input",
64 "%s%d_input_lowest",
65 "%s%d_input_highest"
66 };
67
68 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
69 static void ibmpex_register_bmc(int iface, struct device *dev);
70 static void ibmpex_bmc_gone(int iface);
71
72 struct ibmpex_sensor_data {
73 int in_use;
74 s16 values[PEX_NUM_SENSOR_FUNCS];
75 int multiplier;
76
77 struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
78 };
79
80 struct ibmpex_bmc_data {
81 struct list_head list;
82 struct device *hwmon_dev;
83 struct device *bmc_device;
84 struct mutex lock;
85 char valid;
86 unsigned long last_updated; /* In jiffies */
87
88 struct ipmi_addr address;
89 struct completion read_complete;
90 ipmi_user_t user;
91 int interface;
92
93 struct kernel_ipmi_msg tx_message;
94 unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
95 long tx_msgid;
96
97 unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
98 unsigned long rx_msg_len;
99 unsigned char rx_result;
100 int rx_recv_type;
101
102 unsigned char sensor_major;
103 unsigned char sensor_minor;
104
105 unsigned char num_sensors;
106 struct ibmpex_sensor_data *sensors;
107 };
108
109 struct ibmpex_driver_data {
110 struct list_head bmc_data;
111 struct ipmi_smi_watcher bmc_events;
112 struct ipmi_user_hndl ipmi_hndlrs;
113 };
114
115 static struct ibmpex_driver_data driver_data = {
116 .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
117 .bmc_events = {
118 .owner = THIS_MODULE,
119 .new_smi = ibmpex_register_bmc,
120 .smi_gone = ibmpex_bmc_gone,
121 },
122 .ipmi_hndlrs = {
123 .ipmi_recv_hndl = ibmpex_msg_handler,
124 },
125 };
126
127 static int ibmpex_send_message(struct ibmpex_bmc_data *data)
128 {
129 int err;
130
131 err = ipmi_validate_addr(&data->address, sizeof(data->address));
132 if (err)
133 goto out;
134
135 data->tx_msgid++;
136 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
137 &data->tx_message, data, 0, 0, 0);
138 if (err)
139 goto out1;
140
141 return 0;
142 out1:
143 dev_err(data->bmc_device, "request_settime=%x\n", err);
144 return err;
145 out:
146 dev_err(data->bmc_device, "validate_addr=%x\n", err);
147 return err;
148 }
149
150 static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
151 {
152 data->tx_msg_data[0] = PEX_GET_VERSION;
153 data->tx_message.data_len = 1;
154 ibmpex_send_message(data);
155
156 wait_for_completion(&data->read_complete);
157
158 if (data->rx_result || data->rx_msg_len != 6)
159 return -ENOENT;
160
161 data->sensor_major = data->rx_msg_data[0];
162 data->sensor_minor = data->rx_msg_data[1];
163
164 dev_info(data->bmc_device, "Found BMC with sensor interface "
165 "v%d.%d %d-%02d-%02d on interface %d\n",
166 data->sensor_major,
167 data->sensor_minor,
168 extract_value(data->rx_msg_data, 2),
169 data->rx_msg_data[4],
170 data->rx_msg_data[5],
171 data->interface);
172
173 return 0;
174 }
175
176 static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
177 {
178 data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
179 data->tx_message.data_len = 1;
180 ibmpex_send_message(data);
181
182 wait_for_completion(&data->read_complete);
183
184 if (data->rx_result || data->rx_msg_len != 1)
185 return -ENOENT;
186
187 return data->rx_msg_data[0];
188 }
189
190 static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
191 {
192 data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
193 data->tx_msg_data[1] = sensor;
194 data->tx_message.data_len = 2;
195 ibmpex_send_message(data);
196
197 wait_for_completion(&data->read_complete);
198
199 if (data->rx_result || data->rx_msg_len < 1)
200 return -ENOENT;
201
202 return 0;
203 }
204
205 static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
206 {
207 data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
208 data->tx_msg_data[1] = sensor;
209 data->tx_message.data_len = 2;
210 ibmpex_send_message(data);
211
212 wait_for_completion(&data->read_complete);
213
214 if (data->rx_result || data->rx_msg_len < 26) {
215 dev_err(data->bmc_device, "Error reading sensor %d.\n",
216 sensor);
217 return -ENOENT;
218 }
219
220 return 0;
221 }
222
223 static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
224 {
225 data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
226 data->tx_message.data_len = 1;
227 ibmpex_send_message(data);
228
229 wait_for_completion(&data->read_complete);
230
231 return 0;
232 }
233
234 static void ibmpex_update_device(struct ibmpex_bmc_data *data)
235 {
236 int i, err;
237
238 mutex_lock(&data->lock);
239 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
240 data->valid)
241 goto out;
242
243 for (i = 0; i < data->num_sensors; i++) {
244 if (!data->sensors[i].in_use)
245 continue;
246 err = ibmpex_query_sensor_data(data, i);
247 if (err)
248 continue;
249 data->sensors[i].values[0] =
250 extract_value(data->rx_msg_data, 16);
251 data->sensors[i].values[1] =
252 extract_value(data->rx_msg_data, 18);
253 data->sensors[i].values[2] =
254 extract_value(data->rx_msg_data, 20);
255 }
256
257 data->last_updated = jiffies;
258 data->valid = 1;
259
260 out:
261 mutex_unlock(&data->lock);
262 }
263
264 static struct ibmpex_bmc_data *get_bmc_data(int iface)
265 {
266 struct ibmpex_bmc_data *p, *next;
267
268 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
269 if (p->interface == iface)
270 return p;
271
272 return NULL;
273 }
274
275 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
276 char *buf)
277 {
278 return sprintf(buf, "%s\n", DRVNAME);
279 }
280 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
281
282 static ssize_t ibmpex_show_sensor(struct device *dev,
283 struct device_attribute *devattr,
284 char *buf)
285 {
286 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
287 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
288 int mult = data->sensors[attr->index].multiplier;
289 ibmpex_update_device(data);
290
291 return sprintf(buf, "%d\n",
292 data->sensors[attr->index].values[attr->nr] * mult);
293 }
294
295 static ssize_t ibmpex_reset_high_low(struct device *dev,
296 struct device_attribute *devattr,
297 const char *buf,
298 size_t count)
299 {
300 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
301
302 ibmpex_reset_high_low_data(data);
303
304 return count;
305 }
306
307 static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
308 ibmpex_reset_high_low, 0);
309
310 static int is_power_sensor(const char *sensor_id, int len)
311 {
312 if (len < PEX_SENSOR_TYPE_LEN)
313 return 0;
314
315 if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
316 return 1;
317 return 0;
318 }
319
320 static int is_temp_sensor(const char *sensor_id, int len)
321 {
322 if (len < PEX_SENSOR_TYPE_LEN)
323 return 0;
324
325 if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
326 return 1;
327 return 0;
328 }
329
330 static int power_sensor_multiplier(const char *sensor_id, int len)
331 {
332 int i;
333
334 for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
335 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
336 return 1000000;
337
338 return 100000;
339 }
340
341 static int create_sensor(struct ibmpex_bmc_data *data, int type,
342 int counter, int sensor, int func)
343 {
344 int err;
345 char *n;
346
347 n = kmalloc(32, GFP_KERNEL);
348 if (!n)
349 return -ENOMEM;
350
351 if (type == TEMP_SENSOR)
352 sprintf(n, temp_sensor_name_templates[func], "temp", counter);
353 else if (type == POWER_SENSOR)
354 sprintf(n, power_sensor_name_templates[func], "power", counter);
355
356 data->sensors[sensor].attr[func].dev_attr.attr.name = n;
357 data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
358 data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
359 data->sensors[sensor].attr[func].index = sensor;
360 data->sensors[sensor].attr[func].nr = func;
361
362 err = device_create_file(data->bmc_device,
363 &data->sensors[sensor].attr[func].dev_attr);
364 if (err) {
365 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
366 kfree(n);
367 return err;
368 }
369
370 return 0;
371 }
372
373 static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
374 {
375 int i, j, err;
376 int sensor_type;
377 int sensor_counter;
378 int num_power = 0;
379 int num_temp = 0;
380
381 err = ibmpex_query_sensor_count(data);
382 if (err <= 0)
383 return -ENOENT;
384 data->num_sensors = err;
385
386 data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
387 GFP_KERNEL);
388 if (!data->sensors)
389 return -ENOMEM;
390
391 for (i = 0; i < data->num_sensors; i++) {
392 err = ibmpex_query_sensor_name(data, i);
393 if (err)
394 continue;
395
396 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
397 sensor_type = POWER_SENSOR;
398 num_power++;
399 sensor_counter = num_power;
400 data->sensors[i].multiplier =
401 power_sensor_multiplier(data->rx_msg_data,
402 data->rx_msg_len);
403 } else if (is_temp_sensor(data->rx_msg_data,
404 data->rx_msg_len)) {
405 sensor_type = TEMP_SENSOR;
406 num_temp++;
407 sensor_counter = num_temp;
408 data->sensors[i].multiplier = 1;
409 } else
410 continue;
411
412 data->sensors[i].in_use = 1;
413
414 /* Create attributes */
415 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
416 err = create_sensor(data, sensor_type, sensor_counter,
417 i, j);
418 if (err)
419 goto exit_remove;
420 }
421 }
422
423 err = device_create_file(data->bmc_device,
424 &sensor_dev_attr_reset_high_low.dev_attr);
425 if (err)
426 goto exit_remove;
427
428 err = device_create_file(data->bmc_device,
429 &sensor_dev_attr_name.dev_attr);
430 if (err)
431 goto exit_remove;
432
433 return 0;
434
435 exit_remove:
436 device_remove_file(data->bmc_device,
437 &sensor_dev_attr_reset_high_low.dev_attr);
438 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
439 for (i = 0; i < data->num_sensors; i++)
440 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
441 if (!data->sensors[i].attr[j].dev_attr.attr.name)
442 continue;
443 device_remove_file(data->bmc_device,
444 &data->sensors[i].attr[j].dev_attr);
445 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
446 }
447
448 kfree(data->sensors);
449 return err;
450 }
451
452 static void ibmpex_register_bmc(int iface, struct device *dev)
453 {
454 struct ibmpex_bmc_data *data;
455 int err;
456
457 data = kzalloc(sizeof(*data), GFP_KERNEL);
458 if (!data) {
459 dev_err(dev, "Insufficient memory for BMC interface.\n");
460 return;
461 }
462
463 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
464 data->address.channel = IPMI_BMC_CHANNEL;
465 data->address.data[0] = 0;
466 data->interface = iface;
467 data->bmc_device = dev;
468
469 /* Create IPMI messaging interface user */
470 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
471 data, &data->user);
472 if (err < 0) {
473 dev_err(dev, "Unable to register user with IPMI "
474 "interface %d\n", data->interface);
475 goto out;
476 }
477
478 mutex_init(&data->lock);
479
480 /* Initialize message */
481 data->tx_msgid = 0;
482 init_completion(&data->read_complete);
483 data->tx_message.netfn = PEX_NET_FUNCTION;
484 data->tx_message.cmd = PEX_COMMAND;
485 data->tx_message.data = data->tx_msg_data;
486
487 /* Does this BMC support PowerExecutive? */
488 err = ibmpex_ver_check(data);
489 if (err)
490 goto out_user;
491
492 /* Register the BMC as a HWMON class device */
493 data->hwmon_dev = hwmon_device_register(data->bmc_device);
494
495 if (IS_ERR(data->hwmon_dev)) {
496 dev_err(data->bmc_device, "Unable to register hwmon "
497 "device for IPMI interface %d\n",
498 data->interface);
499 goto out_user;
500 }
501
502 /* finally add the new bmc data to the bmc data list */
503 dev_set_drvdata(dev, data);
504 list_add_tail(&data->list, &driver_data.bmc_data);
505
506 /* Now go find all the sensors */
507 err = ibmpex_find_sensors(data);
508 if (err) {
509 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
510 goto out_register;
511 }
512
513 return;
514
515 out_register:
516 hwmon_device_unregister(data->hwmon_dev);
517 out_user:
518 ipmi_destroy_user(data->user);
519 out:
520 kfree(data);
521 }
522
523 static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
524 {
525 int i, j;
526
527 device_remove_file(data->bmc_device,
528 &sensor_dev_attr_reset_high_low.dev_attr);
529 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
530 for (i = 0; i < data->num_sensors; i++)
531 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
532 if (!data->sensors[i].attr[j].dev_attr.attr.name)
533 continue;
534 device_remove_file(data->bmc_device,
535 &data->sensors[i].attr[j].dev_attr);
536 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
537 }
538
539 list_del(&data->list);
540 dev_set_drvdata(data->bmc_device, NULL);
541 hwmon_device_unregister(data->hwmon_dev);
542 ipmi_destroy_user(data->user);
543 kfree(data->sensors);
544 kfree(data);
545 }
546
547 static void ibmpex_bmc_gone(int iface)
548 {
549 struct ibmpex_bmc_data *data = get_bmc_data(iface);
550
551 if (!data)
552 return;
553
554 ibmpex_bmc_delete(data);
555 }
556
557 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
558 {
559 struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;
560
561 if (msg->msgid != data->tx_msgid) {
562 dev_err(data->bmc_device, "Mismatch between received msgid "
563 "(%02x) and transmitted msgid (%02x)!\n",
564 (int)msg->msgid,
565 (int)data->tx_msgid);
566 ipmi_free_recv_msg(msg);
567 return;
568 }
569
570 data->rx_recv_type = msg->recv_type;
571 if (msg->msg.data_len > 0)
572 data->rx_result = msg->msg.data[0];
573 else
574 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
575
576 if (msg->msg.data_len > 1) {
577 data->rx_msg_len = msg->msg.data_len - 1;
578 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
579 } else
580 data->rx_msg_len = 0;
581
582 ipmi_free_recv_msg(msg);
583 complete(&data->read_complete);
584 }
585
586 static int __init ibmpex_init(void)
587 {
588 return ipmi_smi_watcher_register(&driver_data.bmc_events);
589 }
590
591 static void __exit ibmpex_exit(void)
592 {
593 struct ibmpex_bmc_data *p, *next;
594
595 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
596 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
597 ibmpex_bmc_delete(p);
598 }
599
600 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
601 MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
602 MODULE_LICENSE("GPL");
603
604 module_init(ibmpex_init);
605 module_exit(ibmpex_exit);
WRT350N Kernel Patches