freezer: don't unnecessarily set PF_NOFREEZE explicitly
[linux-2.6.git] / drivers / hwmon / ibmpex.c
blob41dbf8161ed7b4fb1bc29811c61f006152c9a41c
1 /*
2 * A hwmon driver for the IBM PowerExecutive temperature/power sensors
3 * Copyright (C) 2007 IBM
5 * Author: Darrick J. Wong <djwong@us.ibm.com>
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.
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.
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
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 #include <linux/slab.h>
30 #define REFRESH_INTERVAL (2 * HZ)
31 #define DRVNAME "ibmpex"
33 #define PEX_GET_VERSION 1
34 #define PEX_GET_SENSOR_COUNT 2
35 #define PEX_GET_SENSOR_NAME 3
36 #define PEX_RESET_HIGH_LOW 4
37 #define PEX_GET_SENSOR_DATA 6
39 #define PEX_NET_FUNCTION 0x3A
40 #define PEX_COMMAND 0x3C
42 static inline u16 extract_value(const char *data, int offset)
44 return be16_to_cpup((__be16 *)&data[offset]);
47 #define TEMP_SENSOR 1
48 #define POWER_SENSOR 2
50 #define PEX_SENSOR_TYPE_LEN 3
51 static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
52 static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
54 #define PEX_MULT_LEN 2
55 static u8 const watt_sensor_sig[] = {0x41, 0x43};
57 #define PEX_NUM_SENSOR_FUNCS 3
58 static char const * const power_sensor_name_templates[] = {
59 "%s%d_average",
60 "%s%d_average_lowest",
61 "%s%d_average_highest"
63 static char const * const temp_sensor_name_templates[] = {
64 "%s%d_input",
65 "%s%d_input_lowest",
66 "%s%d_input_highest"
69 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
70 static void ibmpex_register_bmc(int iface, struct device *dev);
71 static void ibmpex_bmc_gone(int iface);
73 struct ibmpex_sensor_data {
74 int in_use;
75 s16 values[PEX_NUM_SENSOR_FUNCS];
76 int multiplier;
78 struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
81 struct ibmpex_bmc_data {
82 struct list_head list;
83 struct device *hwmon_dev;
84 struct device *bmc_device;
85 struct mutex lock;
86 char valid;
87 unsigned long last_updated; /* In jiffies */
89 struct ipmi_addr address;
90 struct completion read_complete;
91 ipmi_user_t user;
92 int interface;
94 struct kernel_ipmi_msg tx_message;
95 unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
96 long tx_msgid;
98 unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
99 unsigned long rx_msg_len;
100 unsigned char rx_result;
101 int rx_recv_type;
103 unsigned char sensor_major;
104 unsigned char sensor_minor;
106 unsigned char num_sensors;
107 struct ibmpex_sensor_data *sensors;
110 struct ibmpex_driver_data {
111 struct list_head bmc_data;
112 struct ipmi_smi_watcher bmc_events;
113 struct ipmi_user_hndl ipmi_hndlrs;
116 static struct ibmpex_driver_data driver_data = {
117 .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
118 .bmc_events = {
119 .owner = THIS_MODULE,
120 .new_smi = ibmpex_register_bmc,
121 .smi_gone = ibmpex_bmc_gone,
123 .ipmi_hndlrs = {
124 .ipmi_recv_hndl = ibmpex_msg_handler,
128 static int ibmpex_send_message(struct ibmpex_bmc_data *data)
130 int err;
132 err = ipmi_validate_addr(&data->address, sizeof(data->address));
133 if (err)
134 goto out;
136 data->tx_msgid++;
137 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
138 &data->tx_message, data, 0, 0, 0);
139 if (err)
140 goto out1;
142 return 0;
143 out1:
144 dev_err(data->bmc_device, "request_settime=%x\n", err);
145 return err;
146 out:
147 dev_err(data->bmc_device, "validate_addr=%x\n", err);
148 return err;
151 static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
153 data->tx_msg_data[0] = PEX_GET_VERSION;
154 data->tx_message.data_len = 1;
155 ibmpex_send_message(data);
157 wait_for_completion(&data->read_complete);
159 if (data->rx_result || data->rx_msg_len != 6)
160 return -ENOENT;
162 data->sensor_major = data->rx_msg_data[0];
163 data->sensor_minor = data->rx_msg_data[1];
165 dev_info(data->bmc_device, "Found BMC with sensor interface "
166 "v%d.%d %d-%02d-%02d on interface %d\n",
167 data->sensor_major,
168 data->sensor_minor,
169 extract_value(data->rx_msg_data, 2),
170 data->rx_msg_data[4],
171 data->rx_msg_data[5],
172 data->interface);
174 return 0;
177 static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
179 data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
180 data->tx_message.data_len = 1;
181 ibmpex_send_message(data);
183 wait_for_completion(&data->read_complete);
185 if (data->rx_result || data->rx_msg_len != 1)
186 return -ENOENT;
188 return data->rx_msg_data[0];
191 static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
193 data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
194 data->tx_msg_data[1] = sensor;
195 data->tx_message.data_len = 2;
196 ibmpex_send_message(data);
198 wait_for_completion(&data->read_complete);
200 if (data->rx_result || data->rx_msg_len < 1)
201 return -ENOENT;
203 return 0;
206 static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
208 data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
209 data->tx_msg_data[1] = sensor;
210 data->tx_message.data_len = 2;
211 ibmpex_send_message(data);
213 wait_for_completion(&data->read_complete);
215 if (data->rx_result || data->rx_msg_len < 26) {
216 dev_err(data->bmc_device, "Error reading sensor %d.\n",
217 sensor);
218 return -ENOENT;
221 return 0;
224 static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
226 data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
227 data->tx_message.data_len = 1;
228 ibmpex_send_message(data);
230 wait_for_completion(&data->read_complete);
232 return 0;
235 static void ibmpex_update_device(struct ibmpex_bmc_data *data)
237 int i, err;
239 mutex_lock(&data->lock);
240 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
241 data->valid)
242 goto out;
244 for (i = 0; i < data->num_sensors; i++) {
245 if (!data->sensors[i].in_use)
246 continue;
247 err = ibmpex_query_sensor_data(data, i);
248 if (err)
249 continue;
250 data->sensors[i].values[0] =
251 extract_value(data->rx_msg_data, 16);
252 data->sensors[i].values[1] =
253 extract_value(data->rx_msg_data, 18);
254 data->sensors[i].values[2] =
255 extract_value(data->rx_msg_data, 20);
258 data->last_updated = jiffies;
259 data->valid = 1;
261 out:
262 mutex_unlock(&data->lock);
265 static struct ibmpex_bmc_data *get_bmc_data(int iface)
267 struct ibmpex_bmc_data *p, *next;
269 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
270 if (p->interface == iface)
271 return p;
273 return NULL;
276 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
277 char *buf)
279 return sprintf(buf, "%s\n", DRVNAME);
281 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
283 static ssize_t ibmpex_show_sensor(struct device *dev,
284 struct device_attribute *devattr,
285 char *buf)
287 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
288 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
289 int mult = data->sensors[attr->index].multiplier;
290 ibmpex_update_device(data);
292 return sprintf(buf, "%d\n",
293 data->sensors[attr->index].values[attr->nr] * mult);
296 static ssize_t ibmpex_reset_high_low(struct device *dev,
297 struct device_attribute *devattr,
298 const char *buf,
299 size_t count)
301 struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
303 ibmpex_reset_high_low_data(data);
305 return count;
308 static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
309 ibmpex_reset_high_low, 0);
311 static int is_power_sensor(const char *sensor_id, int len)
313 if (len < PEX_SENSOR_TYPE_LEN)
314 return 0;
316 if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
317 return 1;
318 return 0;
321 static int is_temp_sensor(const char *sensor_id, int len)
323 if (len < PEX_SENSOR_TYPE_LEN)
324 return 0;
326 if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
327 return 1;
328 return 0;
331 static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
332 const char *sensor_id, int len)
334 int i;
336 if (data->sensor_major == 2)
337 return 1000000;
339 for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
340 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
341 return 1000000;
343 return 100000;
346 static int create_sensor(struct ibmpex_bmc_data *data, int type,
347 int counter, int sensor, int func)
349 int err;
350 char *n;
352 n = kmalloc(32, GFP_KERNEL);
353 if (!n)
354 return -ENOMEM;
356 if (type == TEMP_SENSOR)
357 sprintf(n, temp_sensor_name_templates[func], "temp", counter);
358 else if (type == POWER_SENSOR)
359 sprintf(n, power_sensor_name_templates[func], "power", counter);
361 sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
362 data->sensors[sensor].attr[func].dev_attr.attr.name = n;
363 data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
364 data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
365 data->sensors[sensor].attr[func].index = sensor;
366 data->sensors[sensor].attr[func].nr = func;
368 err = device_create_file(data->bmc_device,
369 &data->sensors[sensor].attr[func].dev_attr);
370 if (err) {
371 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
372 kfree(n);
373 return err;
376 return 0;
379 static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
381 int i, j, err;
382 int sensor_type;
383 int sensor_counter;
384 int num_power = 0;
385 int num_temp = 0;
387 err = ibmpex_query_sensor_count(data);
388 if (err <= 0)
389 return -ENOENT;
390 data->num_sensors = err;
392 data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
393 GFP_KERNEL);
394 if (!data->sensors)
395 return -ENOMEM;
397 for (i = 0; i < data->num_sensors; i++) {
398 err = ibmpex_query_sensor_name(data, i);
399 if (err)
400 continue;
402 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
403 sensor_type = POWER_SENSOR;
404 num_power++;
405 sensor_counter = num_power;
406 data->sensors[i].multiplier =
407 power_sensor_multiplier(data,
408 data->rx_msg_data,
409 data->rx_msg_len);
410 } else if (is_temp_sensor(data->rx_msg_data,
411 data->rx_msg_len)) {
412 sensor_type = TEMP_SENSOR;
413 num_temp++;
414 sensor_counter = num_temp;
415 data->sensors[i].multiplier = 1000;
416 } else
417 continue;
419 data->sensors[i].in_use = 1;
421 /* Create attributes */
422 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
423 err = create_sensor(data, sensor_type, sensor_counter,
424 i, j);
425 if (err)
426 goto exit_remove;
430 err = device_create_file(data->bmc_device,
431 &sensor_dev_attr_reset_high_low.dev_attr);
432 if (err)
433 goto exit_remove;
435 err = device_create_file(data->bmc_device,
436 &sensor_dev_attr_name.dev_attr);
437 if (err)
438 goto exit_remove;
440 return 0;
442 exit_remove:
443 device_remove_file(data->bmc_device,
444 &sensor_dev_attr_reset_high_low.dev_attr);
445 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
446 for (i = 0; i < data->num_sensors; i++)
447 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
448 if (!data->sensors[i].attr[j].dev_attr.attr.name)
449 continue;
450 device_remove_file(data->bmc_device,
451 &data->sensors[i].attr[j].dev_attr);
452 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
455 kfree(data->sensors);
456 return err;
459 static void ibmpex_register_bmc(int iface, struct device *dev)
461 struct ibmpex_bmc_data *data;
462 int err;
464 data = kzalloc(sizeof(*data), GFP_KERNEL);
465 if (!data) {
466 dev_err(dev, "Insufficient memory for BMC interface.\n");
467 return;
470 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
471 data->address.channel = IPMI_BMC_CHANNEL;
472 data->address.data[0] = 0;
473 data->interface = iface;
474 data->bmc_device = dev;
476 /* Create IPMI messaging interface user */
477 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
478 data, &data->user);
479 if (err < 0) {
480 dev_err(dev, "Unable to register user with IPMI "
481 "interface %d\n", data->interface);
482 goto out;
485 mutex_init(&data->lock);
487 /* Initialize message */
488 data->tx_msgid = 0;
489 init_completion(&data->read_complete);
490 data->tx_message.netfn = PEX_NET_FUNCTION;
491 data->tx_message.cmd = PEX_COMMAND;
492 data->tx_message.data = data->tx_msg_data;
494 /* Does this BMC support PowerExecutive? */
495 err = ibmpex_ver_check(data);
496 if (err)
497 goto out_user;
499 /* Register the BMC as a HWMON class device */
500 data->hwmon_dev = hwmon_device_register(data->bmc_device);
502 if (IS_ERR(data->hwmon_dev)) {
503 dev_err(data->bmc_device, "Unable to register hwmon "
504 "device for IPMI interface %d\n",
505 data->interface);
506 goto out_user;
509 /* finally add the new bmc data to the bmc data list */
510 dev_set_drvdata(dev, data);
511 list_add_tail(&data->list, &driver_data.bmc_data);
513 /* Now go find all the sensors */
514 err = ibmpex_find_sensors(data);
515 if (err) {
516 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
517 goto out_register;
520 return;
522 out_register:
523 hwmon_device_unregister(data->hwmon_dev);
524 out_user:
525 ipmi_destroy_user(data->user);
526 out:
527 kfree(data);
530 static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
532 int i, j;
534 device_remove_file(data->bmc_device,
535 &sensor_dev_attr_reset_high_low.dev_attr);
536 device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
537 for (i = 0; i < data->num_sensors; i++)
538 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
539 if (!data->sensors[i].attr[j].dev_attr.attr.name)
540 continue;
541 device_remove_file(data->bmc_device,
542 &data->sensors[i].attr[j].dev_attr);
543 kfree(data->sensors[i].attr[j].dev_attr.attr.name);
546 list_del(&data->list);
547 dev_set_drvdata(data->bmc_device, NULL);
548 hwmon_device_unregister(data->hwmon_dev);
549 ipmi_destroy_user(data->user);
550 kfree(data->sensors);
551 kfree(data);
554 static void ibmpex_bmc_gone(int iface)
556 struct ibmpex_bmc_data *data = get_bmc_data(iface);
558 if (!data)
559 return;
561 ibmpex_bmc_delete(data);
564 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
566 struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;
568 if (msg->msgid != data->tx_msgid) {
569 dev_err(data->bmc_device, "Mismatch between received msgid "
570 "(%02x) and transmitted msgid (%02x)!\n",
571 (int)msg->msgid,
572 (int)data->tx_msgid);
573 ipmi_free_recv_msg(msg);
574 return;
577 data->rx_recv_type = msg->recv_type;
578 if (msg->msg.data_len > 0)
579 data->rx_result = msg->msg.data[0];
580 else
581 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
583 if (msg->msg.data_len > 1) {
584 data->rx_msg_len = msg->msg.data_len - 1;
585 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
586 } else
587 data->rx_msg_len = 0;
589 ipmi_free_recv_msg(msg);
590 complete(&data->read_complete);
593 static int __init ibmpex_init(void)
595 return ipmi_smi_watcher_register(&driver_data.bmc_events);
598 static void __exit ibmpex_exit(void)
600 struct ibmpex_bmc_data *p, *next;
602 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
603 list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
604 ibmpex_bmc_delete(p);
607 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
608 MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
609 MODULE_LICENSE("GPL");
611 module_init(ibmpex_init);
612 module_exit(ibmpex_exit);
614 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
615 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
616 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
617 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
618 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");