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; 192 __be16 index; 193 __be16 module_type_id; 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; 205 __be16 module_type_id; 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; 447 *x = be16_to_cpup((__be16 *)rs_resp->bytes); 448 break; 449 } 450 case 4: { 451 u32 *x = buf; 452 *x = be32_to_cpup((__be32 *)rs_resp->bytes); 453 break; 454 } 455 case 8: { 456 u64 *x = buf; 457 *x = be64_to_cpup((__be64 *)rs_resp->bytes); 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); 1112