ibmaem.c revision a064d5bdd0c9602e4cd930ad949392640b37dda7
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 88static DEFINE_IDR(aem_idr); 89static DEFINE_SPINLOCK(aem_idr_lock); 90 91static struct device_driver aem_driver = { 92 .name = DRVNAME, 93 .bus = &platform_bus_type, 94}; 95 96struct 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 113struct 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 121struct 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 132struct 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 */ 181struct aem_iana_id { 182 u8 bytes[3]; 183}; 184static struct aem_iana_id system_x_id = { 185 .bytes = {0x4D, 0x4F, 0x00} 186}; 187 188/* These are used to find AEM1 instances */ 189struct aem_find_firmware_req { 190 struct aem_iana_id id; 191 u8 rsvd; 192 __be16 index; 193 __be16 module_type_id; 194} __packed; 195 196struct 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 */ 202struct aem_find_instance_req { 203 struct aem_iana_id id; 204 u8 instance_number; 205 __be16 module_type_id; 206} __packed; 207 208struct 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 */ 218struct 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 227struct 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 */ 233struct 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 239static void aem_register_bmc(int iface, struct device *dev); 240static void aem_bmc_gone(int iface); 241static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); 242 243static void aem_remove_sensors(struct aem_data *data); 244static int aem_init_aem1(struct aem_ipmi_data *probe); 245static int aem_init_aem2(struct aem_ipmi_data *probe); 246static int aem1_find_sensors(struct aem_data *data); 247static int aem2_find_sensors(struct aem_data *data); 248static void update_aem1_sensors(struct aem_data *data); 249static void update_aem2_sensors(struct aem_data *data); 250 251static 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 */ 266static 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 */ 297static 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; 312out1: 313 dev_err(data->bmc_device, "request_settime=%x\n", err); 314 return err; 315out: 316 dev_err(data->bmc_device, "validate_addr=%x\n", err); 317 return err; 318} 319 320/* Dispatch IPMI messages to callers */ 321static 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 */ 357static int aem_idr_get(int *id) 358{ 359 int i, err; 360 361again: 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 */ 379static 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 */ 389static 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 */ 466static 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 */ 475static 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); 483out: 484 mutex_unlock(&data->lock); 485} 486 487/* Update all AEM2 sensors */ 488static 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); 504out: 505 mutex_unlock(&data->lock); 506} 507 508/* Delete an AEM instance */ 509static 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 */ 524static 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 */ 555static 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 617sensor_err: 618 hwmon_device_unregister(data->hwmon_dev); 619hwmon_reg_err: 620 ipmi_destroy_user(data->ipmi.user); 621ipmi_err: 622 dev_set_drvdata(&data->pdev->dev, NULL); 623 platform_device_unregister(data->pdev); 624dev_err: 625 aem_idr_put(data->id); 626id_err: 627 kfree(data); 628 629 return res; 630} 631 632/* Find and initialize all AEM1 instances */ 633static 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 */ 654static 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 */ 686static 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 749sensor_err: 750 hwmon_device_unregister(data->hwmon_dev); 751hwmon_reg_err: 752 ipmi_destroy_user(data->ipmi.user); 753ipmi_err: 754 dev_set_drvdata(&data->pdev->dev, NULL); 755 platform_device_unregister(data->pdev); 756dev_err: 757 aem_idr_put(data->id); 758id_err: 759 kfree(data); 760 761 return res; 762} 763 764/* Find and initialize all AEM2 instances */ 765static 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 */ 793static 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 */ 808static 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 */ 820static 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} 827static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 828 829/* AEM device version */ 830static 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} 838static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); 839 840/* Display power use */ 841static 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 */ 877static 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 */ 890static 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 */ 902static 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 */ 926static 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 973error: 974 aem_remove_sensors(data); 975 return err; 976} 977 978/* sysfs support functions for AEM2 sensors */ 979 980/* Display temperature use */ 981static 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 */ 993static 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 */ 1005static 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 */ 1025static 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 1031static 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 */ 1037static 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 1055static 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 */ 1062static 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 */ 1068static 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 1075static 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 1090ipmi_reg_err: 1091 driver_unregister(&aem_driver); 1092 return res; 1093 1094} 1095 1096static 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 1106MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 1107MODULE_DESCRIPTION("IBM Active Energy Manager power/temp sensor driver"); 1108MODULE_LICENSE("GPL"); 1109 1110module_init(aem_init); 1111module_exit(aem_exit); 1112