ibmaem.c revision 3cdb2052a6e365ad56202874e6a8a05a2bb336fc
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_IDR(aem_idr); 92static DEFINE_SPINLOCK(aem_idr_lock); 93 94static struct platform_driver aem_driver = { 95 .driver = { 96 .name = DRVNAME, 97 .bus = &platform_bus_type, 98 } 99}; 100 101struct aem_ipmi_data { 102 struct completion read_complete; 103 struct ipmi_addr address; 104 ipmi_user_t user; 105 int interface; 106 107 struct kernel_ipmi_msg tx_message; 108 long tx_msgid; 109 110 void *rx_msg_data; 111 unsigned short rx_msg_len; 112 unsigned char rx_result; 113 int rx_recv_type; 114 115 struct device *bmc_device; 116}; 117 118struct aem_ro_sensor_template { 119 char *label; 120 ssize_t (*show)(struct device *dev, 121 struct device_attribute *devattr, 122 char *buf); 123 int index; 124}; 125 126struct aem_rw_sensor_template { 127 char *label; 128 ssize_t (*show)(struct device *dev, 129 struct device_attribute *devattr, 130 char *buf); 131 ssize_t (*set)(struct device *dev, 132 struct device_attribute *devattr, 133 const char *buf, size_t count); 134 int index; 135}; 136 137struct aem_data { 138 struct list_head list; 139 140 struct device *hwmon_dev; 141 struct platform_device *pdev; 142 struct mutex lock; 143 char valid; 144 unsigned long last_updated; /* In jiffies */ 145 u8 ver_major; 146 u8 ver_minor; 147 u8 module_handle; 148 int id; 149 struct aem_ipmi_data ipmi; 150 151 /* Function to update sensors */ 152 void (*update)(struct aem_data *data); 153 154 /* 155 * AEM 1.x sensors: 156 * Available sensors: 157 * Energy meter 158 * Power meter 159 * 160 * AEM 2.x sensors: 161 * Two energy meters 162 * Two power meters 163 * Two temperature sensors 164 * Six power cap registers 165 */ 166 167 /* sysfs attrs */ 168 struct sensor_device_attribute sensors[AEM_NUM_SENSORS]; 169 170 /* energy use in mJ */ 171 u64 energy[AEM_NUM_ENERGY_REGS]; 172 173 /* power sampling interval in ms */ 174 unsigned long power_period[AEM_NUM_ENERGY_REGS]; 175 176 /* Everything past here is for AEM2 only */ 177 178 /* power caps in dW */ 179 u16 pcap[AEM2_NUM_PCAP_REGS]; 180 181 /* exhaust temperature in C */ 182 u8 temp[AEM2_NUM_TEMP_REGS]; 183}; 184 185/* Data structures returned by the AEM firmware */ 186struct aem_iana_id { 187 u8 bytes[3]; 188}; 189static struct aem_iana_id system_x_id = { 190 .bytes = {0x4D, 0x4F, 0x00} 191}; 192 193/* These are used to find AEM1 instances */ 194struct aem_find_firmware_req { 195 struct aem_iana_id id; 196 u8 rsvd; 197 __be16 index; 198 __be16 module_type_id; 199} __packed; 200 201struct aem_find_firmware_resp { 202 struct aem_iana_id id; 203 u8 num_instances; 204} __packed; 205 206/* These are used to find AEM2 instances */ 207struct aem_find_instance_req { 208 struct aem_iana_id id; 209 u8 instance_number; 210 __be16 module_type_id; 211} __packed; 212 213struct aem_find_instance_resp { 214 struct aem_iana_id id; 215 u8 num_instances; 216 u8 major; 217 u8 minor; 218 u8 module_handle; 219 u16 record_id; 220} __packed; 221 222/* These are used to query sensors */ 223struct aem_read_sensor_req { 224 struct aem_iana_id id; 225 u8 module_handle; 226 u8 element; 227 u8 subcommand; 228 u8 reg; 229 u8 rx_buf_size; 230} __packed; 231 232struct aem_read_sensor_resp { 233 struct aem_iana_id id; 234 u8 bytes[0]; 235} __packed; 236 237/* Data structures to talk to the IPMI layer */ 238struct aem_driver_data { 239 struct list_head aem_devices; 240 struct ipmi_smi_watcher bmc_events; 241 struct ipmi_user_hndl ipmi_hndlrs; 242}; 243 244static void aem_register_bmc(int iface, struct device *dev); 245static void aem_bmc_gone(int iface); 246static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); 247 248static void aem_remove_sensors(struct aem_data *data); 249static int aem_init_aem1(struct aem_ipmi_data *probe); 250static int aem_init_aem2(struct aem_ipmi_data *probe); 251static int aem1_find_sensors(struct aem_data *data); 252static int aem2_find_sensors(struct aem_data *data); 253static void update_aem1_sensors(struct aem_data *data); 254static void update_aem2_sensors(struct aem_data *data); 255 256static struct aem_driver_data driver_data = { 257 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices), 258 .bmc_events = { 259 .owner = THIS_MODULE, 260 .new_smi = aem_register_bmc, 261 .smi_gone = aem_bmc_gone, 262 }, 263 .ipmi_hndlrs = { 264 .ipmi_recv_hndl = aem_msg_handler, 265 }, 266}; 267 268/* Functions to talk to the IPMI layer */ 269 270/* Initialize IPMI address, message buffers and user data */ 271static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface, 272 struct device *bmc) 273{ 274 int err; 275 276 init_completion(&data->read_complete); 277 data->bmc_device = bmc; 278 279 /* Initialize IPMI address */ 280 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 281 data->address.channel = IPMI_BMC_CHANNEL; 282 data->address.data[0] = 0; 283 data->interface = iface; 284 285 /* Initialize message buffers */ 286 data->tx_msgid = 0; 287 data->tx_message.netfn = AEM_NETFN; 288 289 /* Create IPMI messaging interface user */ 290 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, 291 data, &data->user); 292 if (err < 0) { 293 dev_err(bmc, "Unable to register user with IPMI " 294 "interface %d\n", data->interface); 295 return -EACCES; 296 } 297 298 return 0; 299} 300 301/* Send an IPMI command */ 302static int aem_send_message(struct aem_ipmi_data *data) 303{ 304 int err; 305 306 err = ipmi_validate_addr(&data->address, sizeof(data->address)); 307 if (err) 308 goto out; 309 310 data->tx_msgid++; 311 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, 312 &data->tx_message, data, 0, 0, 0); 313 if (err) 314 goto out1; 315 316 return 0; 317out1: 318 dev_err(data->bmc_device, "request_settime=%x\n", err); 319 return err; 320out: 321 dev_err(data->bmc_device, "validate_addr=%x\n", err); 322 return err; 323} 324 325/* Dispatch IPMI messages to callers */ 326static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) 327{ 328 unsigned short rx_len; 329 struct aem_ipmi_data *data = user_msg_data; 330 331 if (msg->msgid != data->tx_msgid) { 332 dev_err(data->bmc_device, "Mismatch between received msgid " 333 "(%02x) and transmitted msgid (%02x)!\n", 334 (int)msg->msgid, 335 (int)data->tx_msgid); 336 ipmi_free_recv_msg(msg); 337 return; 338 } 339 340 data->rx_recv_type = msg->recv_type; 341 if (msg->msg.data_len > 0) 342 data->rx_result = msg->msg.data[0]; 343 else 344 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; 345 346 if (msg->msg.data_len > 1) { 347 rx_len = msg->msg.data_len - 1; 348 if (data->rx_msg_len < rx_len) 349 rx_len = data->rx_msg_len; 350 data->rx_msg_len = rx_len; 351 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); 352 } else 353 data->rx_msg_len = 0; 354 355 ipmi_free_recv_msg(msg); 356 complete(&data->read_complete); 357} 358 359/* ID functions */ 360 361/* Obtain an id */ 362static int aem_idr_get(int *id) 363{ 364 int i, err; 365 366again: 367 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL))) 368 return -ENOMEM; 369 370 spin_lock(&aem_idr_lock); 371 err = idr_get_new(&aem_idr, NULL, &i); 372 spin_unlock(&aem_idr_lock); 373 374 if (unlikely(err == -EAGAIN)) 375 goto again; 376 else if (unlikely(err)) 377 return err; 378 379 *id = i & MAX_ID_MASK; 380 return 0; 381} 382 383/* Release an object ID */ 384static void aem_idr_put(int id) 385{ 386 spin_lock(&aem_idr_lock); 387 idr_remove(&aem_idr, id); 388 spin_unlock(&aem_idr_lock); 389} 390 391/* Sensor support functions */ 392 393/* Read a sensor value */ 394static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, 395 void *buf, size_t size) 396{ 397 int rs_size, res; 398 struct aem_read_sensor_req rs_req; 399 struct aem_read_sensor_resp *rs_resp; 400 struct aem_ipmi_data *ipmi = &data->ipmi; 401 402 /* AEM registers are 1, 2, 4 or 8 bytes */ 403 switch (size) { 404 case 1: 405 case 2: 406 case 4: 407 case 8: 408 break; 409 default: 410 return -EINVAL; 411 } 412 413 rs_req.id = system_x_id; 414 rs_req.module_handle = data->module_handle; 415 rs_req.element = elt; 416 rs_req.subcommand = AEM_READ_REGISTER; 417 rs_req.reg = reg; 418 rs_req.rx_buf_size = size; 419 420 ipmi->tx_message.cmd = AEM_ELEMENT_CMD; 421 ipmi->tx_message.data = (char *)&rs_req; 422 ipmi->tx_message.data_len = sizeof(rs_req); 423 424 rs_size = sizeof(*rs_resp) + size; 425 rs_resp = kzalloc(rs_size, GFP_KERNEL); 426 if (!rs_resp) 427 return -ENOMEM; 428 429 ipmi->rx_msg_data = rs_resp; 430 ipmi->rx_msg_len = rs_size; 431 432 aem_send_message(ipmi); 433 434 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT); 435 if (!res) 436 return -ETIMEDOUT; 437 438 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || 439 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) { 440 kfree(rs_resp); 441 return -ENOENT; 442 } 443 444 switch (size) { 445 case 1: { 446 u8 *x = buf; 447 *x = rs_resp->bytes[0]; 448 break; 449 } 450 case 2: { 451 u16 *x = buf; 452 *x = be16_to_cpup((__be16 *)rs_resp->bytes); 453 break; 454 } 455 case 4: { 456 u32 *x = buf; 457 *x = be32_to_cpup((__be32 *)rs_resp->bytes); 458 break; 459 } 460 case 8: { 461 u64 *x = buf; 462 *x = be64_to_cpup((__be64 *)rs_resp->bytes); 463 break; 464 } 465 } 466 467 return 0; 468} 469 470/* Update AEM energy registers */ 471static void update_aem_energy_one(struct aem_data *data, int which) 472{ 473 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, 474 &data->energy[which], 8); 475} 476 477static void update_aem_energy(struct aem_data *data) 478{ 479 update_aem_energy_one(data, 0); 480 if (data->ver_major < 2) 481 return; 482 update_aem_energy_one(data, 1); 483} 484 485/* Update all AEM1 sensors */ 486static void update_aem1_sensors(struct aem_data *data) 487{ 488 mutex_lock(&data->lock); 489 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 490 data->valid) 491 goto out; 492 493 update_aem_energy(data); 494out: 495 mutex_unlock(&data->lock); 496} 497 498/* Update all AEM2 sensors */ 499static void update_aem2_sensors(struct aem_data *data) 500{ 501 int i; 502 503 mutex_lock(&data->lock); 504 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 505 data->valid) 506 goto out; 507 508 update_aem_energy(data); 509 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); 510 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); 511 512 for (i = POWER_CAP; i <= POWER_AUX; i++) 513 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, 514 &data->pcap[i], 2); 515out: 516 mutex_unlock(&data->lock); 517} 518 519/* Delete an AEM instance */ 520static void aem_delete(struct aem_data *data) 521{ 522 list_del(&data->list); 523 aem_remove_sensors(data); 524 hwmon_device_unregister(data->hwmon_dev); 525 ipmi_destroy_user(data->ipmi.user); 526 platform_set_drvdata(data->pdev, NULL); 527 platform_device_unregister(data->pdev); 528 aem_idr_put(data->id); 529 kfree(data); 530} 531 532/* Probe functions for AEM1 devices */ 533 534/* Retrieve version and module handle for an AEM1 instance */ 535static int aem_find_aem1_count(struct aem_ipmi_data *data) 536{ 537 int res; 538 struct aem_find_firmware_req ff_req; 539 struct aem_find_firmware_resp ff_resp; 540 541 ff_req.id = system_x_id; 542 ff_req.index = 0; 543 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 544 545 data->tx_message.cmd = AEM_FIND_FW_CMD; 546 data->tx_message.data = (char *)&ff_req; 547 data->tx_message.data_len = sizeof(ff_req); 548 549 data->rx_msg_data = &ff_resp; 550 data->rx_msg_len = sizeof(ff_resp); 551 552 aem_send_message(data); 553 554 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 555 if (!res) 556 return -ETIMEDOUT; 557 558 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || 559 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) 560 return -ENOENT; 561 562 return ff_resp.num_instances; 563} 564 565/* Find and initialize one AEM1 instance */ 566static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) 567{ 568 struct aem_data *data; 569 int i; 570 int res = -ENOMEM; 571 572 data = kzalloc(sizeof(*data), GFP_KERNEL); 573 if (!data) 574 return res; 575 mutex_init(&data->lock); 576 577 /* Copy instance data */ 578 data->ver_major = 1; 579 data->ver_minor = 0; 580 data->module_handle = module_handle; 581 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) 582 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 583 584 /* Create sub-device for this fw instance */ 585 if (aem_idr_get(&data->id)) 586 goto id_err; 587 588 data->pdev = platform_device_alloc(DRVNAME, data->id); 589 if (!data->pdev) 590 goto dev_err; 591 data->pdev->dev.driver = &aem_driver.driver; 592 593 res = platform_device_add(data->pdev); 594 if (res) 595 goto ipmi_err; 596 597 platform_set_drvdata(data->pdev, data); 598 599 /* Set up IPMI interface */ 600 if (aem_init_ipmi_data(&data->ipmi, probe->interface, 601 probe->bmc_device)) 602 goto ipmi_err; 603 604 /* Register with hwmon */ 605 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 606 607 if (IS_ERR(data->hwmon_dev)) { 608 dev_err(&data->pdev->dev, "Unable to register hwmon " 609 "device for IPMI interface %d\n", 610 probe->interface); 611 goto hwmon_reg_err; 612 } 613 614 data->update = update_aem1_sensors; 615 616 /* Find sensors */ 617 if (aem1_find_sensors(data)) 618 goto sensor_err; 619 620 /* Add to our list of AEM devices */ 621 list_add_tail(&data->list, &driver_data.aem_devices); 622 623 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 624 data->ver_major, data->ver_minor, 625 data->module_handle); 626 return 0; 627 628sensor_err: 629 hwmon_device_unregister(data->hwmon_dev); 630hwmon_reg_err: 631 ipmi_destroy_user(data->ipmi.user); 632ipmi_err: 633 platform_set_drvdata(data->pdev, NULL); 634 platform_device_unregister(data->pdev); 635dev_err: 636 aem_idr_put(data->id); 637id_err: 638 kfree(data); 639 640 return res; 641} 642 643/* Find and initialize all AEM1 instances */ 644static int aem_init_aem1(struct aem_ipmi_data *probe) 645{ 646 int num, i, err; 647 648 num = aem_find_aem1_count(probe); 649 for (i = 0; i < num; i++) { 650 err = aem_init_aem1_inst(probe, i); 651 if (err) { 652 dev_err(probe->bmc_device, 653 "Error %d initializing AEM1 0x%X\n", 654 err, i); 655 return err; 656 } 657 } 658 659 return 0; 660} 661 662/* Probe functions for AEM2 devices */ 663 664/* Retrieve version and module handle for an AEM2 instance */ 665static int aem_find_aem2(struct aem_ipmi_data *data, 666 struct aem_find_instance_resp *fi_resp, 667 int instance_num) 668{ 669 int res; 670 struct aem_find_instance_req fi_req; 671 672 fi_req.id = system_x_id; 673 fi_req.instance_number = instance_num; 674 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 675 676 data->tx_message.cmd = AEM_FW_INSTANCE_CMD; 677 data->tx_message.data = (char *)&fi_req; 678 data->tx_message.data_len = sizeof(fi_req); 679 680 data->rx_msg_data = fi_resp; 681 data->rx_msg_len = sizeof(*fi_resp); 682 683 aem_send_message(data); 684 685 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 686 if (!res) 687 return -ETIMEDOUT; 688 689 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || 690 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || 691 fi_resp->num_instances <= instance_num) 692 return -ENOENT; 693 694 return 0; 695} 696 697/* Find and initialize one AEM2 instance */ 698static int aem_init_aem2_inst(struct aem_ipmi_data *probe, 699 struct aem_find_instance_resp *fi_resp) 700{ 701 struct aem_data *data; 702 int i; 703 int res = -ENOMEM; 704 705 data = kzalloc(sizeof(*data), GFP_KERNEL); 706 if (!data) 707 return res; 708 mutex_init(&data->lock); 709 710 /* Copy instance data */ 711 data->ver_major = fi_resp->major; 712 data->ver_minor = fi_resp->minor; 713 data->module_handle = fi_resp->module_handle; 714 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) 715 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 716 717 /* Create sub-device for this fw instance */ 718 if (aem_idr_get(&data->id)) 719 goto id_err; 720 721 data->pdev = platform_device_alloc(DRVNAME, data->id); 722 if (!data->pdev) 723 goto dev_err; 724 data->pdev->dev.driver = &aem_driver.driver; 725 726 res = platform_device_add(data->pdev); 727 if (res) 728 goto ipmi_err; 729 730 platform_set_drvdata(data->pdev, data); 731 732 /* Set up IPMI interface */ 733 if (aem_init_ipmi_data(&data->ipmi, probe->interface, 734 probe->bmc_device)) 735 goto ipmi_err; 736 737 /* Register with hwmon */ 738 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 739 740 if (IS_ERR(data->hwmon_dev)) { 741 dev_err(&data->pdev->dev, "Unable to register hwmon " 742 "device for IPMI interface %d\n", 743 probe->interface); 744 goto hwmon_reg_err; 745 } 746 747 data->update = update_aem2_sensors; 748 749 /* Find sensors */ 750 if (aem2_find_sensors(data)) 751 goto sensor_err; 752 753 /* Add to our list of AEM devices */ 754 list_add_tail(&data->list, &driver_data.aem_devices); 755 756 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 757 data->ver_major, data->ver_minor, 758 data->module_handle); 759 return 0; 760 761sensor_err: 762 hwmon_device_unregister(data->hwmon_dev); 763hwmon_reg_err: 764 ipmi_destroy_user(data->ipmi.user); 765ipmi_err: 766 platform_set_drvdata(data->pdev, NULL); 767 platform_device_unregister(data->pdev); 768dev_err: 769 aem_idr_put(data->id); 770id_err: 771 kfree(data); 772 773 return res; 774} 775 776/* Find and initialize all AEM2 instances */ 777static int aem_init_aem2(struct aem_ipmi_data *probe) 778{ 779 struct aem_find_instance_resp fi_resp; 780 int err; 781 int i = 0; 782 783 while (!aem_find_aem2(probe, &fi_resp, i)) { 784 if (fi_resp.major != 2) { 785 dev_err(probe->bmc_device, "Unknown AEM v%d; please " 786 "report this to the maintainer.\n", 787 fi_resp.major); 788 i++; 789 continue; 790 } 791 err = aem_init_aem2_inst(probe, &fi_resp); 792 if (err) { 793 dev_err(probe->bmc_device, 794 "Error %d initializing AEM2 0x%X\n", 795 err, fi_resp.module_handle); 796 return err; 797 } 798 i++; 799 } 800 801 return 0; 802} 803 804/* Probe a BMC for AEM firmware instances */ 805static void aem_register_bmc(int iface, struct device *dev) 806{ 807 struct aem_ipmi_data probe; 808 809 if (aem_init_ipmi_data(&probe, iface, dev)) 810 return; 811 812 /* Ignore probe errors; they won't cause problems */ 813 aem_init_aem1(&probe); 814 aem_init_aem2(&probe); 815 816 ipmi_destroy_user(probe.user); 817} 818 819/* Handle BMC deletion */ 820static void aem_bmc_gone(int iface) 821{ 822 struct aem_data *p1, *next1; 823 824 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 825 if (p1->ipmi.interface == iface) 826 aem_delete(p1); 827} 828 829/* sysfs support functions */ 830 831/* AEM device name */ 832static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 833 char *buf) 834{ 835 struct aem_data *data = dev_get_drvdata(dev); 836 837 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); 838} 839static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 840 841/* AEM device version */ 842static ssize_t show_version(struct device *dev, 843 struct device_attribute *devattr, 844 char *buf) 845{ 846 struct aem_data *data = dev_get_drvdata(dev); 847 848 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); 849} 850static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); 851 852/* Display power use */ 853static ssize_t aem_show_power(struct device *dev, 854 struct device_attribute *devattr, 855 char *buf) 856{ 857 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 858 struct aem_data *data = dev_get_drvdata(dev); 859 u64 before, after, delta, time; 860 signed long leftover; 861 struct timespec b, a; 862 863 mutex_lock(&data->lock); 864 update_aem_energy_one(data, attr->index); 865 getnstimeofday(&b); 866 before = data->energy[attr->index]; 867 868 leftover = schedule_timeout_interruptible( 869 msecs_to_jiffies(data->power_period[attr->index]) 870 ); 871 if (leftover) { 872 mutex_unlock(&data->lock); 873 return 0; 874 } 875 876 update_aem_energy_one(data, attr->index); 877 getnstimeofday(&a); 878 after = data->energy[attr->index]; 879 mutex_unlock(&data->lock); 880 881 time = timespec_to_ns(&a) - timespec_to_ns(&b); 882 delta = (after - before) * UJ_PER_MJ; 883 884 return sprintf(buf, "%llu\n", 885 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); 886} 887 888/* Display energy use */ 889static ssize_t aem_show_energy(struct device *dev, 890 struct device_attribute *devattr, 891 char *buf) 892{ 893 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 894 struct aem_data *a = dev_get_drvdata(dev); 895 mutex_lock(&a->lock); 896 update_aem_energy_one(a, attr->index); 897 mutex_unlock(&a->lock); 898 899 return sprintf(buf, "%llu\n", 900 (unsigned long long)a->energy[attr->index] * 1000); 901} 902 903/* Display power interval registers */ 904static ssize_t aem_show_power_period(struct device *dev, 905 struct device_attribute *devattr, 906 char *buf) 907{ 908 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 909 struct aem_data *a = dev_get_drvdata(dev); 910 a->update(a); 911 912 return sprintf(buf, "%lu\n", a->power_period[attr->index]); 913} 914 915/* Set power interval registers */ 916static ssize_t aem_set_power_period(struct device *dev, 917 struct device_attribute *devattr, 918 const char *buf, size_t count) 919{ 920 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 921 struct aem_data *a = dev_get_drvdata(dev); 922 unsigned long temp; 923 int res; 924 925 res = strict_strtoul(buf, 10, &temp); 926 if (res) 927 return res; 928 929 if (temp < AEM_MIN_POWER_INTERVAL) 930 return -EINVAL; 931 932 mutex_lock(&a->lock); 933 a->power_period[attr->index] = temp; 934 mutex_unlock(&a->lock); 935 936 return count; 937} 938 939/* Discover sensors on an AEM device */ 940static int aem_register_sensors(struct aem_data *data, 941 struct aem_ro_sensor_template *ro, 942 struct aem_rw_sensor_template *rw) 943{ 944 struct device *dev = &data->pdev->dev; 945 struct sensor_device_attribute *sensors = data->sensors; 946 int err; 947 948 /* Set up read-only sensors */ 949 while (ro->label) { 950 sysfs_attr_init(&sensors->dev_attr.attr); 951 sensors->dev_attr.attr.name = ro->label; 952 sensors->dev_attr.attr.mode = S_IRUGO; 953 sensors->dev_attr.show = ro->show; 954 sensors->index = ro->index; 955 956 err = device_create_file(dev, &sensors->dev_attr); 957 if (err) { 958 sensors->dev_attr.attr.name = NULL; 959 goto error; 960 } 961 sensors++; 962 ro++; 963 } 964 965 /* Set up read-write sensors */ 966 while (rw->label) { 967 sysfs_attr_init(&sensors->dev_attr.attr); 968 sensors->dev_attr.attr.name = rw->label; 969 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; 970 sensors->dev_attr.show = rw->show; 971 sensors->dev_attr.store = rw->set; 972 sensors->index = rw->index; 973 974 err = device_create_file(dev, &sensors->dev_attr); 975 if (err) { 976 sensors->dev_attr.attr.name = NULL; 977 goto error; 978 } 979 sensors++; 980 rw++; 981 } 982 983 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); 984 if (err) 985 goto error; 986 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); 987 return err; 988 989error: 990 aem_remove_sensors(data); 991 return err; 992} 993 994/* sysfs support functions for AEM2 sensors */ 995 996/* Display temperature use */ 997static ssize_t aem2_show_temp(struct device *dev, 998 struct device_attribute *devattr, 999 char *buf) 1000{ 1001 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 1002 struct aem_data *a = dev_get_drvdata(dev); 1003 a->update(a); 1004 1005 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); 1006} 1007 1008/* Display power-capping registers */ 1009static ssize_t aem2_show_pcap_value(struct device *dev, 1010 struct device_attribute *devattr, 1011 char *buf) 1012{ 1013 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 1014 struct aem_data *a = dev_get_drvdata(dev); 1015 a->update(a); 1016 1017 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); 1018} 1019 1020/* Remove sensors attached to an AEM device */ 1021static void aem_remove_sensors(struct aem_data *data) 1022{ 1023 int i; 1024 1025 for (i = 0; i < AEM_NUM_SENSORS; i++) { 1026 if (!data->sensors[i].dev_attr.attr.name) 1027 continue; 1028 device_remove_file(&data->pdev->dev, 1029 &data->sensors[i].dev_attr); 1030 } 1031 1032 device_remove_file(&data->pdev->dev, 1033 &sensor_dev_attr_name.dev_attr); 1034 device_remove_file(&data->pdev->dev, 1035 &sensor_dev_attr_version.dev_attr); 1036} 1037 1038/* Sensor probe functions */ 1039 1040/* Description of AEM1 sensors */ 1041static struct aem_ro_sensor_template aem1_ro_sensors[] = { 1042{"energy1_input", aem_show_energy, 0}, 1043{"power1_average", aem_show_power, 0}, 1044{NULL, NULL, 0}, 1045}; 1046 1047static struct aem_rw_sensor_template aem1_rw_sensors[] = { 1048{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1049{NULL, NULL, NULL, 0}, 1050}; 1051 1052/* Description of AEM2 sensors */ 1053static struct aem_ro_sensor_template aem2_ro_sensors[] = { 1054{"energy1_input", aem_show_energy, 0}, 1055{"energy2_input", aem_show_energy, 1}, 1056{"power1_average", aem_show_power, 0}, 1057{"power2_average", aem_show_power, 1}, 1058{"temp1_input", aem2_show_temp, 0}, 1059{"temp2_input", aem2_show_temp, 1}, 1060 1061{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, 1062{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, 1063{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, 1064{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, 1065 1066{"power3_average", aem2_show_pcap_value, POWER_AUX}, 1067{"power_cap", aem2_show_pcap_value, POWER_CAP}, 1068{NULL, NULL, 0}, 1069}; 1070 1071static struct aem_rw_sensor_template aem2_rw_sensors[] = { 1072{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1073{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, 1074{NULL, NULL, NULL, 0}, 1075}; 1076 1077/* Set up AEM1 sensor attrs */ 1078static int aem1_find_sensors(struct aem_data *data) 1079{ 1080 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); 1081} 1082 1083/* Set up AEM2 sensor attrs */ 1084static int aem2_find_sensors(struct aem_data *data) 1085{ 1086 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); 1087} 1088 1089/* Module init/exit routines */ 1090 1091static int __init aem_init(void) 1092{ 1093 int res; 1094 1095 res = driver_register(&aem_driver.driver); 1096 if (res) { 1097 pr_err("Can't register aem driver\n"); 1098 return res; 1099 } 1100 1101 res = ipmi_smi_watcher_register(&driver_data.bmc_events); 1102 if (res) 1103 goto ipmi_reg_err; 1104 return 0; 1105 1106ipmi_reg_err: 1107 driver_unregister(&aem_driver.driver); 1108 return res; 1109 1110} 1111 1112static void __exit aem_exit(void) 1113{ 1114 struct aem_data *p1, *next1; 1115 1116 ipmi_smi_watcher_unregister(&driver_data.bmc_events); 1117 driver_unregister(&aem_driver.driver); 1118 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 1119 aem_delete(p1); 1120} 1121 1122MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 1123MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); 1124MODULE_LICENSE("GPL"); 1125 1126module_init(aem_init); 1127module_exit(aem_exit); 1128 1129MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); 1130MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); 1131MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); 1132MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); 1133MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); 1134MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); 1135MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*"); 1136