ibmaem.c revision 65807044760e03ebf766973c5e94a2ea1d57937b
1/* 2 * A hwmon driver for the IBM System Director Active Energy Manager (AEM) 3 * temperature/power/energy sensors 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25#include <linux/ipmi.h> 26#include <linux/module.h> 27#include <linux/hwmon.h> 28#include <linux/hwmon-sysfs.h> 29#include <linux/jiffies.h> 30#include <linux/mutex.h> 31#include <linux/kdev_t.h> 32#include <linux/spinlock.h> 33#include <linux/idr.h> 34#include <linux/slab.h> 35#include <linux/sched.h> 36#include <linux/platform_device.h> 37#include <linux/math64.h> 38#include <linux/time.h> 39 40#define REFRESH_INTERVAL (HZ) 41#define IPMI_TIMEOUT (30 * HZ) 42#define DRVNAME "aem" 43 44#define AEM_NETFN 0x2E 45 46#define AEM_FIND_FW_CMD 0x80 47#define AEM_ELEMENT_CMD 0x81 48#define AEM_FW_INSTANCE_CMD 0x82 49 50#define AEM_READ_ELEMENT_CFG 0x80 51#define AEM_READ_BUFFER 0x81 52#define AEM_READ_REGISTER 0x82 53#define AEM_WRITE_REGISTER 0x83 54#define AEM_SET_REG_MASK 0x84 55#define AEM_CLEAR_REG_MASK 0x85 56#define AEM_READ_ELEMENT_CFG2 0x86 57 58#define AEM_CONTROL_ELEMENT 0 59#define AEM_ENERGY_ELEMENT 1 60#define AEM_CLOCK_ELEMENT 4 61#define AEM_POWER_CAP_ELEMENT 7 62#define AEM_EXHAUST_ELEMENT 9 63#define AEM_POWER_ELEMENT 10 64 65#define AEM_MODULE_TYPE_ID 0x0001 66 67#define AEM2_NUM_ENERGY_REGS 2 68#define AEM2_NUM_PCAP_REGS 6 69#define AEM2_NUM_TEMP_REGS 2 70#define AEM2_NUM_SENSORS 14 71 72#define AEM1_NUM_ENERGY_REGS 1 73#define AEM1_NUM_SENSORS 3 74 75/* AEM 2.x has more energy registers */ 76#define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS 77/* AEM 2.x needs more sensor files */ 78#define AEM_NUM_SENSORS AEM2_NUM_SENSORS 79 80#define POWER_CAP 0 81#define POWER_CAP_MAX_HOTPLUG 1 82#define POWER_CAP_MAX 2 83#define POWER_CAP_MIN_WARNING 3 84#define POWER_CAP_MIN 4 85#define POWER_AUX 5 86 87#define AEM_DEFAULT_POWER_INTERVAL 1000 88#define AEM_MIN_POWER_INTERVAL 200 89#define UJ_PER_MJ 1000L 90 91static DEFINE_IDA(aem_ida); 92 93static struct platform_driver aem_driver = { 94 .driver = { 95 .name = DRVNAME, 96 .bus = &platform_bus_type, 97 } 98}; 99 100struct aem_ipmi_data { 101 struct completion read_complete; 102 struct ipmi_addr address; 103 ipmi_user_t user; 104 int interface; 105 106 struct kernel_ipmi_msg tx_message; 107 long tx_msgid; 108 109 void *rx_msg_data; 110 unsigned short rx_msg_len; 111 unsigned char rx_result; 112 int rx_recv_type; 113 114 struct device *bmc_device; 115}; 116 117struct aem_ro_sensor_template { 118 char *label; 119 ssize_t (*show)(struct device *dev, 120 struct device_attribute *devattr, 121 char *buf); 122 int index; 123}; 124 125struct aem_rw_sensor_template { 126 char *label; 127 ssize_t (*show)(struct device *dev, 128 struct device_attribute *devattr, 129 char *buf); 130 ssize_t (*set)(struct device *dev, 131 struct device_attribute *devattr, 132 const char *buf, size_t count); 133 int index; 134}; 135 136struct aem_data { 137 struct list_head list; 138 139 struct device *hwmon_dev; 140 struct platform_device *pdev; 141 struct mutex lock; 142 char valid; 143 unsigned long last_updated; /* In jiffies */ 144 u8 ver_major; 145 u8 ver_minor; 146 u8 module_handle; 147 int id; 148 struct aem_ipmi_data ipmi; 149 150 /* Function to update sensors */ 151 void (*update)(struct aem_data *data); 152 153 /* 154 * AEM 1.x sensors: 155 * Available sensors: 156 * Energy meter 157 * Power meter 158 * 159 * AEM 2.x sensors: 160 * Two energy meters 161 * Two power meters 162 * Two temperature sensors 163 * Six power cap registers 164 */ 165 166 /* sysfs attrs */ 167 struct sensor_device_attribute sensors[AEM_NUM_SENSORS]; 168 169 /* energy use in mJ */ 170 u64 energy[AEM_NUM_ENERGY_REGS]; 171 172 /* power sampling interval in ms */ 173 unsigned long power_period[AEM_NUM_ENERGY_REGS]; 174 175 /* Everything past here is for AEM2 only */ 176 177 /* power caps in dW */ 178 u16 pcap[AEM2_NUM_PCAP_REGS]; 179 180 /* exhaust temperature in C */ 181 u8 temp[AEM2_NUM_TEMP_REGS]; 182}; 183 184/* Data structures returned by the AEM firmware */ 185struct aem_iana_id { 186 u8 bytes[3]; 187}; 188static struct aem_iana_id system_x_id = { 189 .bytes = {0x4D, 0x4F, 0x00} 190}; 191 192/* These are used to find AEM1 instances */ 193struct aem_find_firmware_req { 194 struct aem_iana_id id; 195 u8 rsvd; 196 __be16 index; 197 __be16 module_type_id; 198} __packed; 199 200struct aem_find_firmware_resp { 201 struct aem_iana_id id; 202 u8 num_instances; 203} __packed; 204 205/* These are used to find AEM2 instances */ 206struct aem_find_instance_req { 207 struct aem_iana_id id; 208 u8 instance_number; 209 __be16 module_type_id; 210} __packed; 211 212struct aem_find_instance_resp { 213 struct aem_iana_id id; 214 u8 num_instances; 215 u8 major; 216 u8 minor; 217 u8 module_handle; 218 u16 record_id; 219} __packed; 220 221/* These are used to query sensors */ 222struct aem_read_sensor_req { 223 struct aem_iana_id id; 224 u8 module_handle; 225 u8 element; 226 u8 subcommand; 227 u8 reg; 228 u8 rx_buf_size; 229} __packed; 230 231struct aem_read_sensor_resp { 232 struct aem_iana_id id; 233 u8 bytes[0]; 234} __packed; 235 236/* Data structures to talk to the IPMI layer */ 237struct aem_driver_data { 238 struct list_head aem_devices; 239 struct ipmi_smi_watcher bmc_events; 240 struct ipmi_user_hndl ipmi_hndlrs; 241}; 242 243static void aem_register_bmc(int iface, struct device *dev); 244static void aem_bmc_gone(int iface); 245static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); 246 247static void aem_remove_sensors(struct aem_data *data); 248static int aem_init_aem1(struct aem_ipmi_data *probe); 249static int aem_init_aem2(struct aem_ipmi_data *probe); 250static int aem1_find_sensors(struct aem_data *data); 251static int aem2_find_sensors(struct aem_data *data); 252static void update_aem1_sensors(struct aem_data *data); 253static void update_aem2_sensors(struct aem_data *data); 254 255static struct aem_driver_data driver_data = { 256 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices), 257 .bmc_events = { 258 .owner = THIS_MODULE, 259 .new_smi = aem_register_bmc, 260 .smi_gone = aem_bmc_gone, 261 }, 262 .ipmi_hndlrs = { 263 .ipmi_recv_hndl = aem_msg_handler, 264 }, 265}; 266 267/* Functions to talk to the IPMI layer */ 268 269/* Initialize IPMI address, message buffers and user data */ 270static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface, 271 struct device *bmc) 272{ 273 int err; 274 275 init_completion(&data->read_complete); 276 data->bmc_device = bmc; 277 278 /* Initialize IPMI address */ 279 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 280 data->address.channel = IPMI_BMC_CHANNEL; 281 data->address.data[0] = 0; 282 data->interface = iface; 283 284 /* Initialize message buffers */ 285 data->tx_msgid = 0; 286 data->tx_message.netfn = AEM_NETFN; 287 288 /* Create IPMI messaging interface user */ 289 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, 290 data, &data->user); 291 if (err < 0) { 292 dev_err(bmc, "Unable to register user with IPMI " 293 "interface %d\n", data->interface); 294 return -EACCES; 295 } 296 297 return 0; 298} 299 300/* Send an IPMI command */ 301static int aem_send_message(struct aem_ipmi_data *data) 302{ 303 int err; 304 305 err = ipmi_validate_addr(&data->address, sizeof(data->address)); 306 if (err) 307 goto out; 308 309 data->tx_msgid++; 310 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, 311 &data->tx_message, data, 0, 0, 0); 312 if (err) 313 goto out1; 314 315 return 0; 316out1: 317 dev_err(data->bmc_device, "request_settime=%x\n", err); 318 return err; 319out: 320 dev_err(data->bmc_device, "validate_addr=%x\n", err); 321 return err; 322} 323 324/* Dispatch IPMI messages to callers */ 325static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) 326{ 327 unsigned short rx_len; 328 struct aem_ipmi_data *data = user_msg_data; 329 330 if (msg->msgid != data->tx_msgid) { 331 dev_err(data->bmc_device, "Mismatch between received msgid " 332 "(%02x) and transmitted msgid (%02x)!\n", 333 (int)msg->msgid, 334 (int)data->tx_msgid); 335 ipmi_free_recv_msg(msg); 336 return; 337 } 338 339 data->rx_recv_type = msg->recv_type; 340 if (msg->msg.data_len > 0) 341 data->rx_result = msg->msg.data[0]; 342 else 343 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; 344 345 if (msg->msg.data_len > 1) { 346 rx_len = msg->msg.data_len - 1; 347 if (data->rx_msg_len < rx_len) 348 rx_len = data->rx_msg_len; 349 data->rx_msg_len = rx_len; 350 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); 351 } else 352 data->rx_msg_len = 0; 353 354 ipmi_free_recv_msg(msg); 355 complete(&data->read_complete); 356} 357 358/* Sensor support functions */ 359 360/* Read a sensor value */ 361static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, 362 void *buf, size_t size) 363{ 364 int rs_size, res; 365 struct aem_read_sensor_req rs_req; 366 struct aem_read_sensor_resp *rs_resp; 367 struct aem_ipmi_data *ipmi = &data->ipmi; 368 369 /* AEM registers are 1, 2, 4 or 8 bytes */ 370 switch (size) { 371 case 1: 372 case 2: 373 case 4: 374 case 8: 375 break; 376 default: 377 return -EINVAL; 378 } 379 380 rs_req.id = system_x_id; 381 rs_req.module_handle = data->module_handle; 382 rs_req.element = elt; 383 rs_req.subcommand = AEM_READ_REGISTER; 384 rs_req.reg = reg; 385 rs_req.rx_buf_size = size; 386 387 ipmi->tx_message.cmd = AEM_ELEMENT_CMD; 388 ipmi->tx_message.data = (char *)&rs_req; 389 ipmi->tx_message.data_len = sizeof(rs_req); 390 391 rs_size = sizeof(*rs_resp) + size; 392 rs_resp = kzalloc(rs_size, GFP_KERNEL); 393 if (!rs_resp) 394 return -ENOMEM; 395 396 ipmi->rx_msg_data = rs_resp; 397 ipmi->rx_msg_len = rs_size; 398 399 aem_send_message(ipmi); 400 401 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT); 402 if (!res) { 403 res = -ETIMEDOUT; 404 goto out; 405 } 406 407 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || 408 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) { 409 res = -ENOENT; 410 goto out; 411 } 412 413 switch (size) { 414 case 1: { 415 u8 *x = buf; 416 *x = rs_resp->bytes[0]; 417 break; 418 } 419 case 2: { 420 u16 *x = buf; 421 *x = be16_to_cpup((__be16 *)rs_resp->bytes); 422 break; 423 } 424 case 4: { 425 u32 *x = buf; 426 *x = be32_to_cpup((__be32 *)rs_resp->bytes); 427 break; 428 } 429 case 8: { 430 u64 *x = buf; 431 *x = be64_to_cpup((__be64 *)rs_resp->bytes); 432 break; 433 } 434 } 435 res = 0; 436 437out: 438 kfree(rs_resp); 439 return res; 440} 441 442/* Update AEM energy registers */ 443static void update_aem_energy_one(struct aem_data *data, int which) 444{ 445 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, 446 &data->energy[which], 8); 447} 448 449static void update_aem_energy(struct aem_data *data) 450{ 451 update_aem_energy_one(data, 0); 452 if (data->ver_major < 2) 453 return; 454 update_aem_energy_one(data, 1); 455} 456 457/* Update all AEM1 sensors */ 458static void update_aem1_sensors(struct aem_data *data) 459{ 460 mutex_lock(&data->lock); 461 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 462 data->valid) 463 goto out; 464 465 update_aem_energy(data); 466out: 467 mutex_unlock(&data->lock); 468} 469 470/* Update all AEM2 sensors */ 471static void update_aem2_sensors(struct aem_data *data) 472{ 473 int i; 474 475 mutex_lock(&data->lock); 476 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 477 data->valid) 478 goto out; 479 480 update_aem_energy(data); 481 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); 482 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); 483 484 for (i = POWER_CAP; i <= POWER_AUX; i++) 485 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, 486 &data->pcap[i], 2); 487out: 488 mutex_unlock(&data->lock); 489} 490 491/* Delete an AEM instance */ 492static void aem_delete(struct aem_data *data) 493{ 494 list_del(&data->list); 495 aem_remove_sensors(data); 496 hwmon_device_unregister(data->hwmon_dev); 497 ipmi_destroy_user(data->ipmi.user); 498 platform_set_drvdata(data->pdev, NULL); 499 platform_device_unregister(data->pdev); 500 ida_simple_remove(&aem_ida, data->id); 501 kfree(data); 502} 503 504/* Probe functions for AEM1 devices */ 505 506/* Retrieve version and module handle for an AEM1 instance */ 507static int aem_find_aem1_count(struct aem_ipmi_data *data) 508{ 509 int res; 510 struct aem_find_firmware_req ff_req; 511 struct aem_find_firmware_resp ff_resp; 512 513 ff_req.id = system_x_id; 514 ff_req.index = 0; 515 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 516 517 data->tx_message.cmd = AEM_FIND_FW_CMD; 518 data->tx_message.data = (char *)&ff_req; 519 data->tx_message.data_len = sizeof(ff_req); 520 521 data->rx_msg_data = &ff_resp; 522 data->rx_msg_len = sizeof(ff_resp); 523 524 aem_send_message(data); 525 526 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 527 if (!res) 528 return -ETIMEDOUT; 529 530 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || 531 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) 532 return -ENOENT; 533 534 return ff_resp.num_instances; 535} 536 537/* Find and initialize one AEM1 instance */ 538static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) 539{ 540 struct aem_data *data; 541 int i; 542 int res = -ENOMEM; 543 544 data = kzalloc(sizeof(*data), GFP_KERNEL); 545 if (!data) 546 return res; 547 mutex_init(&data->lock); 548 549 /* Copy instance data */ 550 data->ver_major = 1; 551 data->ver_minor = 0; 552 data->module_handle = module_handle; 553 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) 554 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 555 556 /* Create sub-device for this fw instance */ 557 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); 558 if (data->id < 0) 559 goto id_err; 560 561 data->pdev = platform_device_alloc(DRVNAME, data->id); 562 if (!data->pdev) 563 goto dev_err; 564 data->pdev->dev.driver = &aem_driver.driver; 565 566 res = platform_device_add(data->pdev); 567 if (res) 568 goto ipmi_err; 569 570 platform_set_drvdata(data->pdev, data); 571 572 /* Set up IPMI interface */ 573 if (aem_init_ipmi_data(&data->ipmi, probe->interface, 574 probe->bmc_device)) 575 goto ipmi_err; 576 577 /* Register with hwmon */ 578 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 579 580 if (IS_ERR(data->hwmon_dev)) { 581 dev_err(&data->pdev->dev, "Unable to register hwmon " 582 "device for IPMI interface %d\n", 583 probe->interface); 584 goto hwmon_reg_err; 585 } 586 587 data->update = update_aem1_sensors; 588 589 /* Find sensors */ 590 if (aem1_find_sensors(data)) 591 goto sensor_err; 592 593 /* Add to our list of AEM devices */ 594 list_add_tail(&data->list, &driver_data.aem_devices); 595 596 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 597 data->ver_major, data->ver_minor, 598 data->module_handle); 599 return 0; 600 601sensor_err: 602 hwmon_device_unregister(data->hwmon_dev); 603hwmon_reg_err: 604 ipmi_destroy_user(data->ipmi.user); 605ipmi_err: 606 platform_set_drvdata(data->pdev, NULL); 607 platform_device_unregister(data->pdev); 608dev_err: 609 ida_simple_remove(&aem_ida, data->id); 610id_err: 611 kfree(data); 612 613 return res; 614} 615 616/* Find and initialize all AEM1 instances */ 617static int aem_init_aem1(struct aem_ipmi_data *probe) 618{ 619 int num, i, err; 620 621 num = aem_find_aem1_count(probe); 622 for (i = 0; i < num; i++) { 623 err = aem_init_aem1_inst(probe, i); 624 if (err) { 625 dev_err(probe->bmc_device, 626 "Error %d initializing AEM1 0x%X\n", 627 err, i); 628 return err; 629 } 630 } 631 632 return 0; 633} 634 635/* Probe functions for AEM2 devices */ 636 637/* Retrieve version and module handle for an AEM2 instance */ 638static int aem_find_aem2(struct aem_ipmi_data *data, 639 struct aem_find_instance_resp *fi_resp, 640 int instance_num) 641{ 642 int res; 643 struct aem_find_instance_req fi_req; 644 645 fi_req.id = system_x_id; 646 fi_req.instance_number = instance_num; 647 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 648 649 data->tx_message.cmd = AEM_FW_INSTANCE_CMD; 650 data->tx_message.data = (char *)&fi_req; 651 data->tx_message.data_len = sizeof(fi_req); 652 653 data->rx_msg_data = fi_resp; 654 data->rx_msg_len = sizeof(*fi_resp); 655 656 aem_send_message(data); 657 658 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 659 if (!res) 660 return -ETIMEDOUT; 661 662 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || 663 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || 664 fi_resp->num_instances <= instance_num) 665 return -ENOENT; 666 667 return 0; 668} 669 670/* Find and initialize one AEM2 instance */ 671static int aem_init_aem2_inst(struct aem_ipmi_data *probe, 672 struct aem_find_instance_resp *fi_resp) 673{ 674 struct aem_data *data; 675 int i; 676 int res = -ENOMEM; 677 678 data = kzalloc(sizeof(*data), GFP_KERNEL); 679 if (!data) 680 return res; 681 mutex_init(&data->lock); 682 683 /* Copy instance data */ 684 data->ver_major = fi_resp->major; 685 data->ver_minor = fi_resp->minor; 686 data->module_handle = fi_resp->module_handle; 687 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) 688 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 689 690 /* Create sub-device for this fw instance */ 691 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); 692 if (data->id < 0) 693 goto id_err; 694 695 data->pdev = platform_device_alloc(DRVNAME, data->id); 696 if (!data->pdev) 697 goto dev_err; 698 data->pdev->dev.driver = &aem_driver.driver; 699 700 res = platform_device_add(data->pdev); 701 if (res) 702 goto ipmi_err; 703 704 platform_set_drvdata(data->pdev, data); 705 706 /* Set up IPMI interface */ 707 if (aem_init_ipmi_data(&data->ipmi, probe->interface, 708 probe->bmc_device)) 709 goto ipmi_err; 710 711 /* Register with hwmon */ 712 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 713 714 if (IS_ERR(data->hwmon_dev)) { 715 dev_err(&data->pdev->dev, "Unable to register hwmon " 716 "device for IPMI interface %d\n", 717 probe->interface); 718 goto hwmon_reg_err; 719 } 720 721 data->update = update_aem2_sensors; 722 723 /* Find sensors */ 724 if (aem2_find_sensors(data)) 725 goto sensor_err; 726 727 /* Add to our list of AEM devices */ 728 list_add_tail(&data->list, &driver_data.aem_devices); 729 730 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 731 data->ver_major, data->ver_minor, 732 data->module_handle); 733 return 0; 734 735sensor_err: 736 hwmon_device_unregister(data->hwmon_dev); 737hwmon_reg_err: 738 ipmi_destroy_user(data->ipmi.user); 739ipmi_err: 740 platform_set_drvdata(data->pdev, NULL); 741 platform_device_unregister(data->pdev); 742dev_err: 743 ida_simple_remove(&aem_ida, data->id); 744id_err: 745 kfree(data); 746 747 return res; 748} 749 750/* Find and initialize all AEM2 instances */ 751static int aem_init_aem2(struct aem_ipmi_data *probe) 752{ 753 struct aem_find_instance_resp fi_resp; 754 int err; 755 int i = 0; 756 757 while (!aem_find_aem2(probe, &fi_resp, i)) { 758 if (fi_resp.major != 2) { 759 dev_err(probe->bmc_device, "Unknown AEM v%d; please " 760 "report this to the maintainer.\n", 761 fi_resp.major); 762 i++; 763 continue; 764 } 765 err = aem_init_aem2_inst(probe, &fi_resp); 766 if (err) { 767 dev_err(probe->bmc_device, 768 "Error %d initializing AEM2 0x%X\n", 769 err, fi_resp.module_handle); 770 return err; 771 } 772 i++; 773 } 774 775 return 0; 776} 777 778/* Probe a BMC for AEM firmware instances */ 779static void aem_register_bmc(int iface, struct device *dev) 780{ 781 struct aem_ipmi_data probe; 782 783 if (aem_init_ipmi_data(&probe, iface, dev)) 784 return; 785 786 /* Ignore probe errors; they won't cause problems */ 787 aem_init_aem1(&probe); 788 aem_init_aem2(&probe); 789 790 ipmi_destroy_user(probe.user); 791} 792 793/* Handle BMC deletion */ 794static void aem_bmc_gone(int iface) 795{ 796 struct aem_data *p1, *next1; 797 798 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 799 if (p1->ipmi.interface == iface) 800 aem_delete(p1); 801} 802 803/* sysfs support functions */ 804 805/* AEM device name */ 806static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 807 char *buf) 808{ 809 struct aem_data *data = dev_get_drvdata(dev); 810 811 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); 812} 813static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 814 815/* AEM device version */ 816static ssize_t show_version(struct device *dev, 817 struct device_attribute *devattr, 818 char *buf) 819{ 820 struct aem_data *data = dev_get_drvdata(dev); 821 822 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); 823} 824static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); 825 826/* Display power use */ 827static ssize_t aem_show_power(struct device *dev, 828 struct device_attribute *devattr, 829 char *buf) 830{ 831 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 832 struct aem_data *data = dev_get_drvdata(dev); 833 u64 before, after, delta, time; 834 signed long leftover; 835 struct timespec b, a; 836 837 mutex_lock(&data->lock); 838 update_aem_energy_one(data, attr->index); 839 getnstimeofday(&b); 840 before = data->energy[attr->index]; 841 842 leftover = schedule_timeout_interruptible( 843 msecs_to_jiffies(data->power_period[attr->index]) 844 ); 845 if (leftover) { 846 mutex_unlock(&data->lock); 847 return 0; 848 } 849 850 update_aem_energy_one(data, attr->index); 851 getnstimeofday(&a); 852 after = data->energy[attr->index]; 853 mutex_unlock(&data->lock); 854 855 time = timespec_to_ns(&a) - timespec_to_ns(&b); 856 delta = (after - before) * UJ_PER_MJ; 857 858 return sprintf(buf, "%llu\n", 859 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); 860} 861 862/* Display energy use */ 863static ssize_t aem_show_energy(struct device *dev, 864 struct device_attribute *devattr, 865 char *buf) 866{ 867 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 868 struct aem_data *a = dev_get_drvdata(dev); 869 mutex_lock(&a->lock); 870 update_aem_energy_one(a, attr->index); 871 mutex_unlock(&a->lock); 872 873 return sprintf(buf, "%llu\n", 874 (unsigned long long)a->energy[attr->index] * 1000); 875} 876 877/* Display power interval registers */ 878static ssize_t aem_show_power_period(struct device *dev, 879 struct device_attribute *devattr, 880 char *buf) 881{ 882 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 883 struct aem_data *a = dev_get_drvdata(dev); 884 a->update(a); 885 886 return sprintf(buf, "%lu\n", a->power_period[attr->index]); 887} 888 889/* Set power interval registers */ 890static ssize_t aem_set_power_period(struct device *dev, 891 struct device_attribute *devattr, 892 const char *buf, size_t count) 893{ 894 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 895 struct aem_data *a = dev_get_drvdata(dev); 896 unsigned long temp; 897 int res; 898 899 res = strict_strtoul(buf, 10, &temp); 900 if (res) 901 return res; 902 903 if (temp < AEM_MIN_POWER_INTERVAL) 904 return -EINVAL; 905 906 mutex_lock(&a->lock); 907 a->power_period[attr->index] = temp; 908 mutex_unlock(&a->lock); 909 910 return count; 911} 912 913/* Discover sensors on an AEM device */ 914static int aem_register_sensors(struct aem_data *data, 915 struct aem_ro_sensor_template *ro, 916 struct aem_rw_sensor_template *rw) 917{ 918 struct device *dev = &data->pdev->dev; 919 struct sensor_device_attribute *sensors = data->sensors; 920 int err; 921 922 /* Set up read-only sensors */ 923 while (ro->label) { 924 sysfs_attr_init(&sensors->dev_attr.attr); 925 sensors->dev_attr.attr.name = ro->label; 926 sensors->dev_attr.attr.mode = S_IRUGO; 927 sensors->dev_attr.show = ro->show; 928 sensors->index = ro->index; 929 930 err = device_create_file(dev, &sensors->dev_attr); 931 if (err) { 932 sensors->dev_attr.attr.name = NULL; 933 goto error; 934 } 935 sensors++; 936 ro++; 937 } 938 939 /* Set up read-write sensors */ 940 while (rw->label) { 941 sysfs_attr_init(&sensors->dev_attr.attr); 942 sensors->dev_attr.attr.name = rw->label; 943 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; 944 sensors->dev_attr.show = rw->show; 945 sensors->dev_attr.store = rw->set; 946 sensors->index = rw->index; 947 948 err = device_create_file(dev, &sensors->dev_attr); 949 if (err) { 950 sensors->dev_attr.attr.name = NULL; 951 goto error; 952 } 953 sensors++; 954 rw++; 955 } 956 957 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); 958 if (err) 959 goto error; 960 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); 961 return err; 962 963error: 964 aem_remove_sensors(data); 965 return err; 966} 967 968/* sysfs support functions for AEM2 sensors */ 969 970/* Display temperature use */ 971static ssize_t aem2_show_temp(struct device *dev, 972 struct device_attribute *devattr, 973 char *buf) 974{ 975 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 976 struct aem_data *a = dev_get_drvdata(dev); 977 a->update(a); 978 979 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); 980} 981 982/* Display power-capping registers */ 983static ssize_t aem2_show_pcap_value(struct device *dev, 984 struct device_attribute *devattr, 985 char *buf) 986{ 987 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 988 struct aem_data *a = dev_get_drvdata(dev); 989 a->update(a); 990 991 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); 992} 993 994/* Remove sensors attached to an AEM device */ 995static void aem_remove_sensors(struct aem_data *data) 996{ 997 int i; 998 999 for (i = 0; i < AEM_NUM_SENSORS; i++) { 1000 if (!data->sensors[i].dev_attr.attr.name) 1001 continue; 1002 device_remove_file(&data->pdev->dev, 1003 &data->sensors[i].dev_attr); 1004 } 1005 1006 device_remove_file(&data->pdev->dev, 1007 &sensor_dev_attr_name.dev_attr); 1008 device_remove_file(&data->pdev->dev, 1009 &sensor_dev_attr_version.dev_attr); 1010} 1011 1012/* Sensor probe functions */ 1013 1014/* Description of AEM1 sensors */ 1015static struct aem_ro_sensor_template aem1_ro_sensors[] = { 1016{"energy1_input", aem_show_energy, 0}, 1017{"power1_average", aem_show_power, 0}, 1018{NULL, NULL, 0}, 1019}; 1020 1021static struct aem_rw_sensor_template aem1_rw_sensors[] = { 1022{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1023{NULL, NULL, NULL, 0}, 1024}; 1025 1026/* Description of AEM2 sensors */ 1027static struct aem_ro_sensor_template aem2_ro_sensors[] = { 1028{"energy1_input", aem_show_energy, 0}, 1029{"energy2_input", aem_show_energy, 1}, 1030{"power1_average", aem_show_power, 0}, 1031{"power2_average", aem_show_power, 1}, 1032{"temp1_input", aem2_show_temp, 0}, 1033{"temp2_input", aem2_show_temp, 1}, 1034 1035{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, 1036{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, 1037{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, 1038{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, 1039 1040{"power3_average", aem2_show_pcap_value, POWER_AUX}, 1041{"power_cap", aem2_show_pcap_value, POWER_CAP}, 1042{NULL, NULL, 0}, 1043}; 1044 1045static struct aem_rw_sensor_template aem2_rw_sensors[] = { 1046{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1047{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, 1048{NULL, NULL, NULL, 0}, 1049}; 1050 1051/* Set up AEM1 sensor attrs */ 1052static int aem1_find_sensors(struct aem_data *data) 1053{ 1054 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); 1055} 1056 1057/* Set up AEM2 sensor attrs */ 1058static int aem2_find_sensors(struct aem_data *data) 1059{ 1060 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); 1061} 1062 1063/* Module init/exit routines */ 1064 1065static int __init aem_init(void) 1066{ 1067 int res; 1068 1069 res = driver_register(&aem_driver.driver); 1070 if (res) { 1071 pr_err("Can't register aem driver\n"); 1072 return res; 1073 } 1074 1075 res = ipmi_smi_watcher_register(&driver_data.bmc_events); 1076 if (res) 1077 goto ipmi_reg_err; 1078 return 0; 1079 1080ipmi_reg_err: 1081 driver_unregister(&aem_driver.driver); 1082 return res; 1083 1084} 1085 1086static void __exit aem_exit(void) 1087{ 1088 struct aem_data *p1, *next1; 1089 1090 ipmi_smi_watcher_unregister(&driver_data.bmc_events); 1091 driver_unregister(&aem_driver.driver); 1092 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 1093 aem_delete(p1); 1094} 1095 1096MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 1097MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); 1098MODULE_LICENSE("GPL"); 1099 1100module_init(aem_init); 1101module_exit(aem_exit); 1102 1103MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); 1104MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); 1105MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); 1106MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); 1107MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); 1108MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); 1109MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*"); 1110