drivers/hwmon/ibmpex.c

   1 /*
   2  * A hwmon driver for the IBM PowerExecutive temperature/power sensors
   3  * Copyright (C) 2007 IBM
   4  *
   5  * Author: Darrick J. Wong <darrick.wong@oracle.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 #include <linux/slab.h>
  29 #include <linux/err.h>
  30
  31 #define REFRESH_INTERVAL        (2 * HZ)
  32 #define DRVNAME                 "ibmpex"
  33
  34 #define PEX_GET_VERSION         1
  35 #define PEX_GET_SENSOR_COUNT    2
  36 #define PEX_GET_SENSOR_NAME     3
  37 #define PEX_RESET_HIGH_LOW      4
  38 #define PEX_GET_SENSOR_DATA     6
  39
  40 #define PEX_NET_FUNCTION        0x3A
  41 #define PEX_COMMAND             0x3C
  42
  43 static inline u16 extract_value(const char *data, int offset)
  44 {
  45         return be16_to_cpup((__be16 *)&data[offset]);
  46 }
  47
  48 #define TEMP_SENSOR             1
  49 #define POWER_SENSOR            2
  50
  51 #define PEX_SENSOR_TYPE_LEN     3
  52 static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
  53 static u8 const temp_sensor_sig[]  = {0x74, 0x65, 0x6D};
  54
  55 #define PEX_MULT_LEN            2
  56 static u8 const watt_sensor_sig[]  = {0x41, 0x43};
  57
  58 #define PEX_NUM_SENSOR_FUNCS    3
  59 static const char * const sensor_name_suffixes[] = {
  60         "",
  61         "_lowest",
  62         "_highest"
  63 };
  64
  65 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
  66 static void ibmpex_register_bmc(int iface, struct device *dev);
  67 static void ibmpex_bmc_gone(int iface);
  68
  69 struct ibmpex_sensor_data {
  70         int                     in_use;
  71         s16                     values[PEX_NUM_SENSOR_FUNCS];
  72         int                     multiplier;
  73
  74         struct sensor_device_attribute_2        attr[PEX_NUM_SENSOR_FUNCS];
  75 };
  76
  77 struct ibmpex_bmc_data {
  78         struct list_head        list;
  79         struct device           *hwmon_dev;
  80         struct device           *bmc_device;
  81         struct mutex            lock;
  82         char                    valid;
  83         unsigned long           last_updated;   /* In jiffies */
  84
  85         struct ipmi_addr        address;
  86         struct completion       read_complete;
  87         ipmi_user_t             user;
  88         int                     interface;
  89
  90         struct kernel_ipmi_msg  tx_message;
  91         unsigned char           tx_msg_data[IPMI_MAX_MSG_LENGTH];
  92         long                    tx_msgid;
  93
  94         unsigned char           rx_msg_data[IPMI_MAX_MSG_LENGTH];
  95         unsigned long           rx_msg_len;
  96         unsigned char           rx_result;
  97         int                     rx_recv_type;
  98
  99         unsigned char           sensor_major;
 100         unsigned char           sensor_minor;
 101
 102         unsigned char           num_sensors;
 103         struct ibmpex_sensor_data       *sensors;
 104 };
 105
 106 struct ibmpex_driver_data {
 107         struct list_head        bmc_data;
 108         struct ipmi_smi_watcher bmc_events;
 109         struct ipmi_user_hndl   ipmi_hndlrs;
 110 };
 111
 112 static struct ibmpex_driver_data driver_data = {
 113         .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
 114         .bmc_events = {
 115                 .owner = THIS_MODULE,
 116                 .new_smi = ibmpex_register_bmc,
 117                 .smi_gone = ibmpex_bmc_gone,
 118         },
 119         .ipmi_hndlrs = {
 120                 .ipmi_recv_hndl = ibmpex_msg_handler,
 121         },
 122 };
 123
 124 static int ibmpex_send_message(struct ibmpex_bmc_data *data)
 125 {
 126         int err;
 127
 128         err = ipmi_validate_addr(&data->address, sizeof(data->address));
 129         if (err)
 130                 goto out;
 131
 132         data->tx_msgid++;
 133         err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
 134                                    &data->tx_message, data, 0, 0, 0);
 135         if (err)
 136                 goto out1;
 137
 138         return 0;
 139 out1:
 140         dev_err(data->bmc_device, "request_settime=%x\n", err);
 141         return err;
 142 out:
 143         dev_err(data->bmc_device, "validate_addr=%x\n", err);
 144         return err;
 145 }
 146
 147 static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
 148 {
 149         data->tx_msg_data[0] = PEX_GET_VERSION;
 150         data->tx_message.data_len = 1;
 151         ibmpex_send_message(data);
 152
 153         wait_for_completion(&data->read_complete);
 154
 155         if (data->rx_result || data->rx_msg_len != 6)
 156                 return -ENOENT;
 157
 158         data->sensor_major = data->rx_msg_data[0];
 159         data->sensor_minor = data->rx_msg_data[1];
 160
 161         dev_info(data->bmc_device,
 162                  "Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
 163                  data->sensor_major,
 164                  data->sensor_minor,
 165                  extract_value(data->rx_msg_data, 2),
 166                  data->rx_msg_data[4],
 167                  data->rx_msg_data[5],
 168                  data->interface);
 169
 170         return 0;
 171 }
 172
 173 static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
 174 {
 175         data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
 176         data->tx_message.data_len = 1;
 177         ibmpex_send_message(data);
 178
 179         wait_for_completion(&data->read_complete);
 180
 181         if (data->rx_result || data->rx_msg_len != 1)
 182                 return -ENOENT;
 183
 184         return data->rx_msg_data[0];
 185 }
 186
 187 static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
 188 {
 189         data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
 190         data->tx_msg_data[1] = sensor;
 191         data->tx_message.data_len = 2;
 192         ibmpex_send_message(data);
 193
 194         wait_for_completion(&data->read_complete);
 195
 196         if (data->rx_result || data->rx_msg_len < 1)
 197                 return -ENOENT;
 198
 199         return 0;
 200 }
 201
 202 static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
 203 {
 204         data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
 205         data->tx_msg_data[1] = sensor;
 206         data->tx_message.data_len = 2;
 207         ibmpex_send_message(data);
 208
 209         wait_for_completion(&data->read_complete);
 210
 211         if (data->rx_result || data->rx_msg_len < 26) {
 212                 dev_err(data->bmc_device, "Error reading sensor %d.\n",
 213                         sensor);
 214                 return -ENOENT;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
 221 {
 222         data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
 223         data->tx_message.data_len = 1;
 224         ibmpex_send_message(data);
 225
 226         wait_for_completion(&data->read_complete);
 227
 228         return 0;
 229 }
 230
 231 static void ibmpex_update_device(struct ibmpex_bmc_data *data)
 232 {
 233         int i, err;
 234
 235         mutex_lock(&data->lock);
 236         if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
 237             data->valid)
 238                 goto out;
 239
 240         for (i = 0; i < data->num_sensors; i++) {
 241                 if (!data->sensors[i].in_use)
 242                         continue;
 243                 err = ibmpex_query_sensor_data(data, i);
 244                 if (err)
 245                         continue;
 246                 data->sensors[i].values[0] =
 247                         extract_value(data->rx_msg_data, 16);
 248                 data->sensors[i].values[1] =
 249                         extract_value(data->rx_msg_data, 18);
 250                 data->sensors[i].values[2] =
 251                         extract_value(data->rx_msg_data, 20);
 252         }
 253
 254         data->last_updated = jiffies;
 255         data->valid = 1;
 256
 257 out:
 258         mutex_unlock(&data->lock);
 259 }
 260
 261 static struct ibmpex_bmc_data *get_bmc_data(int iface)
 262 {
 263         struct ibmpex_bmc_data *p, *next;
 264
 265         list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
 266                 if (p->interface == iface)
 267                         return p;
 268
 269         return NULL;
 270 }
 271
 272 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
 273                          char *buf)
 274 {
 275         return sprintf(buf, "%s\n", DRVNAME);
 276 }
 277 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
 278
 279 static ssize_t ibmpex_show_sensor(struct device *dev,
 280                                   struct device_attribute *devattr,
 281                                   char *buf)
 282 {
 283         struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
 284         struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
 285         int mult = data->sensors[attr->index].multiplier;
 286         ibmpex_update_device(data);
 287
 288         return sprintf(buf, "%d\n",
 289                        data->sensors[attr->index].values[attr->nr] * mult);
 290 }
 291
 292 static ssize_t ibmpex_reset_high_low(struct device *dev,
 293                                      struct device_attribute *devattr,
 294                                      const char *buf,
 295                                      size_t count)
 296 {
 297         struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
 298
 299         ibmpex_reset_high_low_data(data);
 300
 301         return count;
 302 }
 303
 304 static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
 305                           ibmpex_reset_high_low, 0);
 306
 307 static int is_power_sensor(const char *sensor_id, int len)
 308 {
 309         if (len < PEX_SENSOR_TYPE_LEN)
 310                 return 0;
 311
 312         if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
 313                 return 1;
 314         return 0;
 315 }
 316
 317 static int is_temp_sensor(const char *sensor_id, int len)
 318 {
 319         if (len < PEX_SENSOR_TYPE_LEN)
 320                 return 0;
 321
 322         if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
 323                 return 1;
 324         return 0;
 325 }
 326
 327 static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
 328                                    const char *sensor_id, int len)
 329 {
 330         int i;
 331
 332         if (data->sensor_major == 2)
 333                 return 1000000;
 334
 335         for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
 336                 if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
 337                         return 1000000;
 338
 339         return 100000;
 340 }
 341
 342 static int create_sensor(struct ibmpex_bmc_data *data, int type,
 343                          int counter, int sensor, int func)
 344 {
 345         int err;
 346         char *n;
 347
 348         n = kmalloc(32, GFP_KERNEL);
 349         if (!n)
 350                 return -ENOMEM;
 351
 352         if (type == TEMP_SENSOR)
 353                 sprintf(n, "temp%d_input%s",
 354                         counter, sensor_name_suffixes[func]);
 355         else if (type == POWER_SENSOR)
 356                 sprintf(n, "power%d_average%s",
 357                         counter, sensor_name_suffixes[func]);
 358
 359         sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
 360         data->sensors[sensor].attr[func].dev_attr.attr.name = n;
 361         data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
 362         data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
 363         data->sensors[sensor].attr[func].index = sensor;
 364         data->sensors[sensor].attr[func].nr = func;
 365
 366         err = device_create_file(data->bmc_device,
 367                                  &data->sensors[sensor].attr[func].dev_attr);
 368         if (err) {
 369                 data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
 370                 kfree(n);
 371                 return err;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
 378 {
 379         int i, j, err;
 380         int sensor_type;
 381         int sensor_counter;
 382         int num_power = 0;
 383         int num_temp = 0;
 384
 385         err = ibmpex_query_sensor_count(data);
 386         if (err <= 0)
 387                 return -ENOENT;
 388         data->num_sensors = err;
 389
 390         data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
 391                                 GFP_KERNEL);
 392         if (!data->sensors)
 393                 return -ENOMEM;
 394
 395         for (i = 0; i < data->num_sensors; i++) {
 396                 err = ibmpex_query_sensor_name(data, i);
 397                 if (err)
 398                         continue;
 399
 400                 if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
 401                         sensor_type = POWER_SENSOR;
 402                         num_power++;
 403                         sensor_counter = num_power;
 404                         data->sensors[i].multiplier =
 405                                 power_sensor_multiplier(data,
 406                                                         data->rx_msg_data,
 407                                                         data->rx_msg_len);
 408                 } else if (is_temp_sensor(data->rx_msg_data,
 409                                           data->rx_msg_len)) {
 410                         sensor_type = TEMP_SENSOR;
 411                         num_temp++;
 412                         sensor_counter = num_temp;
 413                         data->sensors[i].multiplier = 1000;
 414                 } else
 415                         continue;
 416
 417                 data->sensors[i].in_use = 1;
 418
 419                 /* Create attributes */
 420                 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
 421                         err = create_sensor(data, sensor_type, sensor_counter,
 422                                             i, j);
 423                         if (err)
 424                                 goto exit_remove;
 425                 }
 426         }
 427
 428         err = device_create_file(data->bmc_device,
 429                         &sensor_dev_attr_reset_high_low.dev_attr);
 430         if (err)
 431                 goto exit_remove;
 432
 433         err = device_create_file(data->bmc_device,
 434                         &sensor_dev_attr_name.dev_attr);
 435         if (err)
 436                 goto exit_remove;
 437
 438         return 0;
 439
 440 exit_remove:
 441         device_remove_file(data->bmc_device,
 442                            &sensor_dev_attr_reset_high_low.dev_attr);
 443         device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
 444         for (i = 0; i < data->num_sensors; i++)
 445                 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
 446                         if (!data->sensors[i].attr[j].dev_attr.attr.name)
 447                                 continue;
 448                         device_remove_file(data->bmc_device,
 449                                 &data->sensors[i].attr[j].dev_attr);
 450                         kfree(data->sensors[i].attr[j].dev_attr.attr.name);
 451                 }
 452
 453         kfree(data->sensors);
 454         return err;
 455 }
 456
 457 static void ibmpex_register_bmc(int iface, struct device *dev)
 458 {
 459         struct ibmpex_bmc_data *data;
 460         int err;
 461
 462         data = kzalloc(sizeof(*data), GFP_KERNEL);
 463         if (!data)
 464                 return;
 465
 466         data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 467         data->address.channel = IPMI_BMC_CHANNEL;
 468         data->address.data[0] = 0;
 469         data->interface = iface;
 470         data->bmc_device = dev;
 471
 472         /* Create IPMI messaging interface user */
 473         err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
 474                                data, &data->user);
 475         if (err < 0) {
 476                 dev_err(dev,
 477                         "Unable to register user with IPMI interface %d\n",
 478                         data->interface);
 479                 goto out;
 480         }
 481
 482         mutex_init(&data->lock);
 483
 484         /* Initialize message */
 485         data->tx_msgid = 0;
 486         init_completion(&data->read_complete);
 487         data->tx_message.netfn = PEX_NET_FUNCTION;
 488         data->tx_message.cmd = PEX_COMMAND;
 489         data->tx_message.data = data->tx_msg_data;
 490
 491         /* Does this BMC support PowerExecutive? */
 492         err = ibmpex_ver_check(data);
 493         if (err)
 494                 goto out_user;
 495
 496         /* Register the BMC as a HWMON class device */
 497         data->hwmon_dev = hwmon_device_register(data->bmc_device);
 498
 499         if (IS_ERR(data->hwmon_dev)) {
 500                 dev_err(data->bmc_device,
 501                         "Unable to register hwmon device for IPMI interface %d\n",
 502                         data->interface);
 503                 goto out_user;
 504         }
 505
 506         /* finally add the new bmc data to the bmc data list */
 507         dev_set_drvdata(dev, data);
 508         list_add_tail(&data->list, &driver_data.bmc_data);
 509
 510         /* Now go find all the sensors */
 511         err = ibmpex_find_sensors(data);
 512         if (err) {
 513                 dev_err(data->bmc_device, "Error %d finding sensors\n", err);
 514                 goto out_register;
 515         }
 516
 517         return;
 518
 519 out_register:
 520         hwmon_device_unregister(data->hwmon_dev);
 521 out_user:
 522         ipmi_destroy_user(data->user);
 523 out:
 524         kfree(data);
 525 }
 526
 527 static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
 528 {
 529         int i, j;
 530
 531         device_remove_file(data->bmc_device,
 532                            &sensor_dev_attr_reset_high_low.dev_attr);
 533         device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
 534         for (i = 0; i < data->num_sensors; i++)
 535                 for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
 536                         if (!data->sensors[i].attr[j].dev_attr.attr.name)
 537                                 continue;
 538                         device_remove_file(data->bmc_device,
 539                                 &data->sensors[i].attr[j].dev_attr);
 540                         kfree(data->sensors[i].attr[j].dev_attr.attr.name);
 541                 }
 542
 543         list_del(&data->list);
 544         dev_set_drvdata(data->bmc_device, NULL);
 545         hwmon_device_unregister(data->hwmon_dev);
 546         ipmi_destroy_user(data->user);
 547         kfree(data->sensors);
 548         kfree(data);
 549 }
 550
 551 static void ibmpex_bmc_gone(int iface)
 552 {
 553         struct ibmpex_bmc_data *data = get_bmc_data(iface);
 554
 555         if (!data)
 556                 return;
 557
 558         ibmpex_bmc_delete(data);
 559 }
 560
 561 static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
 562 {
 563         struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data;
 564
 565         if (msg->msgid != data->tx_msgid) {
 566                 dev_err(data->bmc_device,
 567                         "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
 568                         (int)msg->msgid,
 569                         (int)data->tx_msgid);
 570                 ipmi_free_recv_msg(msg);
 571                 return;
 572         }
 573
 574         data->rx_recv_type = msg->recv_type;
 575         if (msg->msg.data_len > 0)
 576                 data->rx_result = msg->msg.data[0];
 577         else
 578                 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
 579
 580         if (msg->msg.data_len > 1) {
 581                 data->rx_msg_len = msg->msg.data_len - 1;
 582                 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len);
 583         } else
 584                 data->rx_msg_len = 0;
 585
 586         ipmi_free_recv_msg(msg);
 587         complete(&data->read_complete);
 588 }
 589
 590 static int __init ibmpex_init(void)
 591 {
 592         return ipmi_smi_watcher_register(&driver_data.bmc_events);
 593 }
 594
 595 static void __exit ibmpex_exit(void)
 596 {
 597         struct ibmpex_bmc_data *p, *next;
 598
 599         ipmi_smi_watcher_unregister(&driver_data.bmc_events);
 600         list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
 601                 ibmpex_bmc_delete(p);
 602 }
 603
 604 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
 605 MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver");
 606 MODULE_LICENSE("GPL");
 607
 608 module_init(ibmpex_init);
 609 module_exit(ibmpex_exit);
 610
 611 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
 612 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
 613 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
 614 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
 615 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");