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 <darrick.wong@oracle.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 #include <linux/err.h> 40 41 #define REFRESH_INTERVAL (HZ) 42 #define IPMI_TIMEOUT (30 * HZ) 43 #define DRVNAME "aem" 44 45 #define AEM_NETFN 0x2E 46 47 #define AEM_FIND_FW_CMD 0x80 48 #define AEM_ELEMENT_CMD 0x81 49 #define AEM_FW_INSTANCE_CMD 0x82 50 51 #define AEM_READ_ELEMENT_CFG 0x80 52 #define AEM_READ_BUFFER 0x81 53 #define AEM_READ_REGISTER 0x82 54 #define AEM_WRITE_REGISTER 0x83 55 #define AEM_SET_REG_MASK 0x84 56 #define AEM_CLEAR_REG_MASK 0x85 57 #define AEM_READ_ELEMENT_CFG2 0x86 58 59 #define AEM_CONTROL_ELEMENT 0 60 #define AEM_ENERGY_ELEMENT 1 61 #define AEM_CLOCK_ELEMENT 4 62 #define AEM_POWER_CAP_ELEMENT 7 63 #define AEM_EXHAUST_ELEMENT 9 64 #define AEM_POWER_ELEMENT 10 65 66 #define AEM_MODULE_TYPE_ID 0x0001 67 68 #define AEM2_NUM_ENERGY_REGS 2 69 #define AEM2_NUM_PCAP_REGS 6 70 #define AEM2_NUM_TEMP_REGS 2 71 #define AEM2_NUM_SENSORS 14 72 73 #define AEM1_NUM_ENERGY_REGS 1 74 #define AEM1_NUM_SENSORS 3 75 76 /* AEM 2.x has more energy registers */ 77 #define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS 78 /* AEM 2.x needs more sensor files */ 79 #define AEM_NUM_SENSORS AEM2_NUM_SENSORS 80 81 #define POWER_CAP 0 82 #define POWER_CAP_MAX_HOTPLUG 1 83 #define POWER_CAP_MAX 2 84 #define POWER_CAP_MIN_WARNING 3 85 #define POWER_CAP_MIN 4 86 #define POWER_AUX 5 87 88 #define AEM_DEFAULT_POWER_INTERVAL 1000 89 #define AEM_MIN_POWER_INTERVAL 200 90 #define UJ_PER_MJ 1000L 91 92 static DEFINE_IDA(aem_ida); 93 94 static struct platform_driver aem_driver = { 95 .driver = { 96 .name = DRVNAME, 97 .bus = &platform_bus_type, 98 } 99 }; 100 101 struct aem_ipmi_data { 102 struct completion read_complete; 103 struct ipmi_addr address; 104 struct ipmi_user *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 }; 117 118 struct 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 }; 125 126 struct 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 }; 136 137 struct 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 and buffer to update sensors */ 152 void (*update)(struct aem_data *data); 153 struct aem_read_sensor_resp *rs_resp; 154 155 /* 156 * AEM 1.x sensors: 157 * Available sensors: 158 * Energy meter 159 * Power meter 160 * 161 * AEM 2.x sensors: 162 * Two energy meters 163 * Two power meters 164 * Two temperature sensors 165 * Six power cap registers 166 */ 167 168 /* sysfs attrs */ 169 struct sensor_device_attribute sensors[AEM_NUM_SENSORS]; 170 171 /* energy use in mJ */ 172 u64 energy[AEM_NUM_ENERGY_REGS]; 173 174 /* power sampling interval in ms */ 175 unsigned long power_period[AEM_NUM_ENERGY_REGS]; 176 177 /* Everything past here is for AEM2 only */ 178 179 /* power caps in dW */ 180 u16 pcap[AEM2_NUM_PCAP_REGS]; 181 182 /* exhaust temperature in C */ 183 u8 temp[AEM2_NUM_TEMP_REGS]; 184 }; 185 186 /* Data structures returned by the AEM firmware */ 187 struct aem_iana_id { 188 u8 bytes[3]; 189 }; 190 static struct aem_iana_id system_x_id = { 191 .bytes = {0x4D, 0x4F, 0x00} 192 }; 193 194 /* These are used to find AEM1 instances */ 195 struct aem_find_firmware_req { 196 struct aem_iana_id id; 197 u8 rsvd; 198 __be16 index; 199 __be16 module_type_id; 200 } __packed; 201 202 struct aem_find_firmware_resp { 203 struct aem_iana_id id; 204 u8 num_instances; 205 } __packed; 206 207 /* These are used to find AEM2 instances */ 208 struct aem_find_instance_req { 209 struct aem_iana_id id; 210 u8 instance_number; 211 __be16 module_type_id; 212 } __packed; 213 214 struct aem_find_instance_resp { 215 struct aem_iana_id id; 216 u8 num_instances; 217 u8 major; 218 u8 minor; 219 u8 module_handle; 220 u16 record_id; 221 } __packed; 222 223 /* These are used to query sensors */ 224 struct aem_read_sensor_req { 225 struct aem_iana_id id; 226 u8 module_handle; 227 u8 element; 228 u8 subcommand; 229 u8 reg; 230 u8 rx_buf_size; 231 } __packed; 232 233 struct aem_read_sensor_resp { 234 struct aem_iana_id id; 235 u8 bytes[0]; 236 } __packed; 237 238 /* Data structures to talk to the IPMI layer */ 239 struct aem_driver_data { 240 struct list_head aem_devices; 241 struct ipmi_smi_watcher bmc_events; 242 struct ipmi_user_hndl ipmi_hndlrs; 243 }; 244 245 static void aem_register_bmc(int iface, struct device *dev); 246 static void aem_bmc_gone(int iface); 247 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); 248 249 static void aem_remove_sensors(struct aem_data *data); 250 static int aem1_find_sensors(struct aem_data *data); 251 static int aem2_find_sensors(struct aem_data *data); 252 static void update_aem1_sensors(struct aem_data *data); 253 static void update_aem2_sensors(struct aem_data *data); 254 255 static 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 */ 270 static 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, 293 "Unable to register user with IPMI interface %d\n", 294 data->interface); 295 return err; 296 } 297 298 return 0; 299 } 300 301 /* Send an IPMI command */ 302 static 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; 317 out1: 318 dev_err(data->bmc_device, "request_settime=%x\n", err); 319 return err; 320 out: 321 dev_err(data->bmc_device, "validate_addr=%x\n", err); 322 return err; 323 } 324 325 /* Dispatch IPMI messages to callers */ 326 static 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, 333 "Mismatch between received msgid (%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 /* Sensor support functions */ 360 361 /* Read a sensor value; must be called with data->lock held */ 362 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, 363 void *buf, size_t size) 364 { 365 int rs_size, res; 366 struct aem_read_sensor_req rs_req; 367 /* Use preallocated rx buffer */ 368 struct aem_read_sensor_resp *rs_resp = data->rs_resp; 369 struct aem_ipmi_data *ipmi = &data->ipmi; 370 371 /* AEM registers are 1, 2, 4 or 8 bytes */ 372 switch (size) { 373 case 1: 374 case 2: 375 case 4: 376 case 8: 377 break; 378 default: 379 return -EINVAL; 380 } 381 382 rs_req.id = system_x_id; 383 rs_req.module_handle = data->module_handle; 384 rs_req.element = elt; 385 rs_req.subcommand = AEM_READ_REGISTER; 386 rs_req.reg = reg; 387 rs_req.rx_buf_size = size; 388 389 ipmi->tx_message.cmd = AEM_ELEMENT_CMD; 390 ipmi->tx_message.data = (char *)&rs_req; 391 ipmi->tx_message.data_len = sizeof(rs_req); 392 393 rs_size = sizeof(*rs_resp) + size; 394 ipmi->rx_msg_data = rs_resp; 395 ipmi->rx_msg_len = rs_size; 396 397 aem_send_message(ipmi); 398 399 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT); 400 if (!res) { 401 res = -ETIMEDOUT; 402 goto out; 403 } 404 405 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || 406 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) { 407 res = -ENOENT; 408 goto out; 409 } 410 411 switch (size) { 412 case 1: { 413 u8 *x = buf; 414 *x = rs_resp->bytes[0]; 415 break; 416 } 417 case 2: { 418 u16 *x = buf; 419 *x = be16_to_cpup((__be16 *)rs_resp->bytes); 420 break; 421 } 422 case 4: { 423 u32 *x = buf; 424 *x = be32_to_cpup((__be32 *)rs_resp->bytes); 425 break; 426 } 427 case 8: { 428 u64 *x = buf; 429 *x = be64_to_cpup((__be64 *)rs_resp->bytes); 430 break; 431 } 432 } 433 res = 0; 434 435 out: 436 return res; 437 } 438 439 /* Update AEM energy registers */ 440 static void update_aem_energy_one(struct aem_data *data, int which) 441 { 442 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, 443 &data->energy[which], 8); 444 } 445 446 static void update_aem_energy(struct aem_data *data) 447 { 448 update_aem_energy_one(data, 0); 449 if (data->ver_major < 2) 450 return; 451 update_aem_energy_one(data, 1); 452 } 453 454 /* Update all AEM1 sensors */ 455 static void update_aem1_sensors(struct aem_data *data) 456 { 457 mutex_lock(&data->lock); 458 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 459 data->valid) 460 goto out; 461 462 update_aem_energy(data); 463 out: 464 mutex_unlock(&data->lock); 465 } 466 467 /* Update all AEM2 sensors */ 468 static void update_aem2_sensors(struct aem_data *data) 469 { 470 int i; 471 472 mutex_lock(&data->lock); 473 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 474 data->valid) 475 goto out; 476 477 update_aem_energy(data); 478 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); 479 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); 480 481 for (i = POWER_CAP; i <= POWER_AUX; i++) 482 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, 483 &data->pcap[i], 2); 484 out: 485 mutex_unlock(&data->lock); 486 } 487 488 /* Delete an AEM instance */ 489 static void aem_delete(struct aem_data *data) 490 { 491 list_del(&data->list); 492 aem_remove_sensors(data); 493 kfree(data->rs_resp); 494 hwmon_device_unregister(data->hwmon_dev); 495 ipmi_destroy_user(data->ipmi.user); 496 platform_set_drvdata(data->pdev, NULL); 497 platform_device_unregister(data->pdev); 498 ida_simple_remove(&aem_ida, data->id); 499 kfree(data); 500 } 501 502 /* Probe functions for AEM1 devices */ 503 504 /* Retrieve version and module handle for an AEM1 instance */ 505 static int aem_find_aem1_count(struct aem_ipmi_data *data) 506 { 507 int res; 508 struct aem_find_firmware_req ff_req; 509 struct aem_find_firmware_resp ff_resp; 510 511 ff_req.id = system_x_id; 512 ff_req.index = 0; 513 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 514 515 data->tx_message.cmd = AEM_FIND_FW_CMD; 516 data->tx_message.data = (char *)&ff_req; 517 data->tx_message.data_len = sizeof(ff_req); 518 519 data->rx_msg_data = &ff_resp; 520 data->rx_msg_len = sizeof(ff_resp); 521 522 aem_send_message(data); 523 524 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 525 if (!res) 526 return -ETIMEDOUT; 527 528 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || 529 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) 530 return -ENOENT; 531 532 return ff_resp.num_instances; 533 } 534 535 /* Find and initialize one AEM1 instance */ 536 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) 537 { 538 struct aem_data *data; 539 int i; 540 int res = -ENOMEM; 541 542 data = kzalloc(sizeof(*data), GFP_KERNEL); 543 if (!data) 544 return res; 545 mutex_init(&data->lock); 546 547 /* Copy instance data */ 548 data->ver_major = 1; 549 data->ver_minor = 0; 550 data->module_handle = module_handle; 551 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) 552 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 553 554 /* Create sub-device for this fw instance */ 555 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); 556 if (data->id < 0) 557 goto id_err; 558 559 data->pdev = platform_device_alloc(DRVNAME, data->id); 560 if (!data->pdev) 561 goto dev_err; 562 data->pdev->dev.driver = &aem_driver.driver; 563 564 res = platform_device_add(data->pdev); 565 if (res) 566 goto ipmi_err; 567 568 platform_set_drvdata(data->pdev, data); 569 570 /* Set up IPMI interface */ 571 res = aem_init_ipmi_data(&data->ipmi, probe->interface, 572 probe->bmc_device); 573 if (res) 574 goto ipmi_err; 575 576 /* Register with hwmon */ 577 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 578 if (IS_ERR(data->hwmon_dev)) { 579 dev_err(&data->pdev->dev, 580 "Unable to register hwmon device for IPMI interface %d\n", 581 probe->interface); 582 res = PTR_ERR(data->hwmon_dev); 583 goto hwmon_reg_err; 584 } 585 586 data->update = update_aem1_sensors; 587 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); 588 if (!data->rs_resp) { 589 res = -ENOMEM; 590 goto alloc_resp_err; 591 } 592 593 /* Find sensors */ 594 res = aem1_find_sensors(data); 595 if (res) 596 goto sensor_err; 597 598 /* Add to our list of AEM devices */ 599 list_add_tail(&data->list, &driver_data.aem_devices); 600 601 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 602 data->ver_major, data->ver_minor, 603 data->module_handle); 604 return 0; 605 606 sensor_err: 607 kfree(data->rs_resp); 608 alloc_resp_err: 609 hwmon_device_unregister(data->hwmon_dev); 610 hwmon_reg_err: 611 ipmi_destroy_user(data->ipmi.user); 612 ipmi_err: 613 platform_set_drvdata(data->pdev, NULL); 614 platform_device_unregister(data->pdev); 615 dev_err: 616 ida_simple_remove(&aem_ida, data->id); 617 id_err: 618 kfree(data); 619 620 return res; 621 } 622 623 /* Find and initialize all AEM1 instances */ 624 static void aem_init_aem1(struct aem_ipmi_data *probe) 625 { 626 int num, i, err; 627 628 num = aem_find_aem1_count(probe); 629 for (i = 0; i < num; i++) { 630 err = aem_init_aem1_inst(probe, i); 631 if (err) { 632 dev_err(probe->bmc_device, 633 "Error %d initializing AEM1 0x%X\n", 634 err, i); 635 } 636 } 637 } 638 639 /* Probe functions for AEM2 devices */ 640 641 /* Retrieve version and module handle for an AEM2 instance */ 642 static int aem_find_aem2(struct aem_ipmi_data *data, 643 struct aem_find_instance_resp *fi_resp, 644 int instance_num) 645 { 646 int res; 647 struct aem_find_instance_req fi_req; 648 649 fi_req.id = system_x_id; 650 fi_req.instance_number = instance_num; 651 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 652 653 data->tx_message.cmd = AEM_FW_INSTANCE_CMD; 654 data->tx_message.data = (char *)&fi_req; 655 data->tx_message.data_len = sizeof(fi_req); 656 657 data->rx_msg_data = fi_resp; 658 data->rx_msg_len = sizeof(*fi_resp); 659 660 aem_send_message(data); 661 662 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); 663 if (!res) 664 return -ETIMEDOUT; 665 666 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || 667 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || 668 fi_resp->num_instances <= instance_num) 669 return -ENOENT; 670 671 return 0; 672 } 673 674 /* Find and initialize one AEM2 instance */ 675 static int aem_init_aem2_inst(struct aem_ipmi_data *probe, 676 struct aem_find_instance_resp *fi_resp) 677 { 678 struct aem_data *data; 679 int i; 680 int res = -ENOMEM; 681 682 data = kzalloc(sizeof(*data), GFP_KERNEL); 683 if (!data) 684 return res; 685 mutex_init(&data->lock); 686 687 /* Copy instance data */ 688 data->ver_major = fi_resp->major; 689 data->ver_minor = fi_resp->minor; 690 data->module_handle = fi_resp->module_handle; 691 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) 692 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 693 694 /* Create sub-device for this fw instance */ 695 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); 696 if (data->id < 0) 697 goto id_err; 698 699 data->pdev = platform_device_alloc(DRVNAME, data->id); 700 if (!data->pdev) 701 goto dev_err; 702 data->pdev->dev.driver = &aem_driver.driver; 703 704 res = platform_device_add(data->pdev); 705 if (res) 706 goto ipmi_err; 707 708 platform_set_drvdata(data->pdev, data); 709 710 /* Set up IPMI interface */ 711 res = aem_init_ipmi_data(&data->ipmi, probe->interface, 712 probe->bmc_device); 713 if (res) 714 goto ipmi_err; 715 716 /* Register with hwmon */ 717 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 718 if (IS_ERR(data->hwmon_dev)) { 719 dev_err(&data->pdev->dev, 720 "Unable to register hwmon device for IPMI interface %d\n", 721 probe->interface); 722 res = PTR_ERR(data->hwmon_dev); 723 goto hwmon_reg_err; 724 } 725 726 data->update = update_aem2_sensors; 727 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); 728 if (!data->rs_resp) { 729 res = -ENOMEM; 730 goto alloc_resp_err; 731 } 732 733 /* Find sensors */ 734 res = aem2_find_sensors(data); 735 if (res) 736 goto sensor_err; 737 738 /* Add to our list of AEM devices */ 739 list_add_tail(&data->list, &driver_data.aem_devices); 740 741 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 742 data->ver_major, data->ver_minor, 743 data->module_handle); 744 return 0; 745 746 sensor_err: 747 kfree(data->rs_resp); 748 alloc_resp_err: 749 hwmon_device_unregister(data->hwmon_dev); 750 hwmon_reg_err: 751 ipmi_destroy_user(data->ipmi.user); 752 ipmi_err: 753 platform_set_drvdata(data->pdev, NULL); 754 platform_device_unregister(data->pdev); 755 dev_err: 756 ida_simple_remove(&aem_ida, data->id); 757 id_err: 758 kfree(data); 759 760 return res; 761 } 762 763 /* Find and initialize all AEM2 instances */ 764 static void aem_init_aem2(struct aem_ipmi_data *probe) 765 { 766 struct aem_find_instance_resp fi_resp; 767 int err; 768 int i = 0; 769 770 while (!aem_find_aem2(probe, &fi_resp, i)) { 771 if (fi_resp.major != 2) { 772 dev_err(probe->bmc_device, 773 "Unknown AEM v%d; please report this to the maintainer.\n", 774 fi_resp.major); 775 i++; 776 continue; 777 } 778 err = aem_init_aem2_inst(probe, &fi_resp); 779 if (err) { 780 dev_err(probe->bmc_device, 781 "Error %d initializing AEM2 0x%X\n", 782 err, fi_resp.module_handle); 783 } 784 i++; 785 } 786 } 787 788 /* Probe a BMC for AEM firmware instances */ 789 static void aem_register_bmc(int iface, struct device *dev) 790 { 791 struct aem_ipmi_data probe; 792 793 if (aem_init_ipmi_data(&probe, iface, dev)) 794 return; 795 796 /* Ignore probe errors; they won't cause problems */ 797 aem_init_aem1(&probe); 798 aem_init_aem2(&probe); 799 800 ipmi_destroy_user(probe.user); 801 } 802 803 /* Handle BMC deletion */ 804 static void aem_bmc_gone(int iface) 805 { 806 struct aem_data *p1, *next1; 807 808 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 809 if (p1->ipmi.interface == iface) 810 aem_delete(p1); 811 } 812 813 /* sysfs support functions */ 814 815 /* AEM device name */ 816 static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 817 char *buf) 818 { 819 struct aem_data *data = dev_get_drvdata(dev); 820 821 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); 822 } 823 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); 824 825 /* AEM device version */ 826 static ssize_t show_version(struct device *dev, 827 struct device_attribute *devattr, 828 char *buf) 829 { 830 struct aem_data *data = dev_get_drvdata(dev); 831 832 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); 833 } 834 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); 835 836 /* Display power use */ 837 static ssize_t aem_show_power(struct device *dev, 838 struct device_attribute *devattr, 839 char *buf) 840 { 841 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 842 struct aem_data *data = dev_get_drvdata(dev); 843 u64 before, after, delta, time; 844 signed long leftover; 845 846 mutex_lock(&data->lock); 847 update_aem_energy_one(data, attr->index); 848 time = ktime_get_ns(); 849 before = data->energy[attr->index]; 850 851 leftover = schedule_timeout_interruptible( 852 msecs_to_jiffies(data->power_period[attr->index]) 853 ); 854 if (leftover) { 855 mutex_unlock(&data->lock); 856 return 0; 857 } 858 859 update_aem_energy_one(data, attr->index); 860 time = ktime_get_ns() - time; 861 after = data->energy[attr->index]; 862 mutex_unlock(&data->lock); 863 864 delta = (after - before) * UJ_PER_MJ; 865 866 return sprintf(buf, "%llu\n", 867 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); 868 } 869 870 /* Display energy use */ 871 static ssize_t aem_show_energy(struct device *dev, 872 struct device_attribute *devattr, 873 char *buf) 874 { 875 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 876 struct aem_data *a = dev_get_drvdata(dev); 877 mutex_lock(&a->lock); 878 update_aem_energy_one(a, attr->index); 879 mutex_unlock(&a->lock); 880 881 return sprintf(buf, "%llu\n", 882 (unsigned long long)a->energy[attr->index] * 1000); 883 } 884 885 /* Display power interval registers */ 886 static ssize_t aem_show_power_period(struct device *dev, 887 struct device_attribute *devattr, 888 char *buf) 889 { 890 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 891 struct aem_data *a = dev_get_drvdata(dev); 892 a->update(a); 893 894 return sprintf(buf, "%lu\n", a->power_period[attr->index]); 895 } 896 897 /* Set power interval registers */ 898 static ssize_t aem_set_power_period(struct device *dev, 899 struct device_attribute *devattr, 900 const char *buf, size_t count) 901 { 902 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 903 struct aem_data *a = dev_get_drvdata(dev); 904 unsigned long temp; 905 int res; 906 907 res = kstrtoul(buf, 10, &temp); 908 if (res) 909 return res; 910 911 if (temp < AEM_MIN_POWER_INTERVAL) 912 return -EINVAL; 913 914 mutex_lock(&a->lock); 915 a->power_period[attr->index] = temp; 916 mutex_unlock(&a->lock); 917 918 return count; 919 } 920 921 /* Discover sensors on an AEM device */ 922 static int aem_register_sensors(struct aem_data *data, 923 const struct aem_ro_sensor_template *ro, 924 const struct aem_rw_sensor_template *rw) 925 { 926 struct device *dev = &data->pdev->dev; 927 struct sensor_device_attribute *sensors = data->sensors; 928 int err; 929 930 /* Set up read-only sensors */ 931 while (ro->label) { 932 sysfs_attr_init(&sensors->dev_attr.attr); 933 sensors->dev_attr.attr.name = ro->label; 934 sensors->dev_attr.attr.mode = S_IRUGO; 935 sensors->dev_attr.show = ro->show; 936 sensors->index = ro->index; 937 938 err = device_create_file(dev, &sensors->dev_attr); 939 if (err) { 940 sensors->dev_attr.attr.name = NULL; 941 goto error; 942 } 943 sensors++; 944 ro++; 945 } 946 947 /* Set up read-write sensors */ 948 while (rw->label) { 949 sysfs_attr_init(&sensors->dev_attr.attr); 950 sensors->dev_attr.attr.name = rw->label; 951 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; 952 sensors->dev_attr.show = rw->show; 953 sensors->dev_attr.store = rw->set; 954 sensors->index = rw->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 rw++; 963 } 964 965 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); 966 if (err) 967 goto error; 968 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); 969 return err; 970 971 error: 972 aem_remove_sensors(data); 973 return err; 974 } 975 976 /* sysfs support functions for AEM2 sensors */ 977 978 /* Display temperature use */ 979 static ssize_t aem2_show_temp(struct device *dev, 980 struct device_attribute *devattr, 981 char *buf) 982 { 983 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 984 struct aem_data *a = dev_get_drvdata(dev); 985 a->update(a); 986 987 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); 988 } 989 990 /* Display power-capping registers */ 991 static ssize_t aem2_show_pcap_value(struct device *dev, 992 struct device_attribute *devattr, 993 char *buf) 994 { 995 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 996 struct aem_data *a = dev_get_drvdata(dev); 997 a->update(a); 998 999 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); 1000 } 1001 1002 /* Remove sensors attached to an AEM device */ 1003 static void aem_remove_sensors(struct aem_data *data) 1004 { 1005 int i; 1006 1007 for (i = 0; i < AEM_NUM_SENSORS; i++) { 1008 if (!data->sensors[i].dev_attr.attr.name) 1009 continue; 1010 device_remove_file(&data->pdev->dev, 1011 &data->sensors[i].dev_attr); 1012 } 1013 1014 device_remove_file(&data->pdev->dev, 1015 &sensor_dev_attr_name.dev_attr); 1016 device_remove_file(&data->pdev->dev, 1017 &sensor_dev_attr_version.dev_attr); 1018 } 1019 1020 /* Sensor probe functions */ 1021 1022 /* Description of AEM1 sensors */ 1023 static const struct aem_ro_sensor_template aem1_ro_sensors[] = { 1024 {"energy1_input", aem_show_energy, 0}, 1025 {"power1_average", aem_show_power, 0}, 1026 {NULL, NULL, 0}, 1027 }; 1028 1029 static const struct aem_rw_sensor_template aem1_rw_sensors[] = { 1030 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1031 {NULL, NULL, NULL, 0}, 1032 }; 1033 1034 /* Description of AEM2 sensors */ 1035 static const struct aem_ro_sensor_template aem2_ro_sensors[] = { 1036 {"energy1_input", aem_show_energy, 0}, 1037 {"energy2_input", aem_show_energy, 1}, 1038 {"power1_average", aem_show_power, 0}, 1039 {"power2_average", aem_show_power, 1}, 1040 {"temp1_input", aem2_show_temp, 0}, 1041 {"temp2_input", aem2_show_temp, 1}, 1042 1043 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, 1044 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, 1045 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, 1046 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, 1047 1048 {"power3_average", aem2_show_pcap_value, POWER_AUX}, 1049 {"power_cap", aem2_show_pcap_value, POWER_CAP}, 1050 {NULL, NULL, 0}, 1051 }; 1052 1053 static const struct aem_rw_sensor_template aem2_rw_sensors[] = { 1054 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1055 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, 1056 {NULL, NULL, NULL, 0}, 1057 }; 1058 1059 /* Set up AEM1 sensor attrs */ 1060 static int aem1_find_sensors(struct aem_data *data) 1061 { 1062 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); 1063 } 1064 1065 /* Set up AEM2 sensor attrs */ 1066 static int aem2_find_sensors(struct aem_data *data) 1067 { 1068 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); 1069 } 1070 1071 /* Module init/exit routines */ 1072 1073 static int __init aem_init(void) 1074 { 1075 int res; 1076 1077 res = driver_register(&aem_driver.driver); 1078 if (res) { 1079 pr_err("Can't register aem driver\n"); 1080 return res; 1081 } 1082 1083 res = ipmi_smi_watcher_register(&driver_data.bmc_events); 1084 if (res) 1085 goto ipmi_reg_err; 1086 return 0; 1087 1088 ipmi_reg_err: 1089 driver_unregister(&aem_driver.driver); 1090 return res; 1091 1092 } 1093 1094 static void __exit aem_exit(void) 1095 { 1096 struct aem_data *p1, *next1; 1097 1098 ipmi_smi_watcher_unregister(&driver_data.bmc_events); 1099 driver_unregister(&aem_driver.driver); 1100 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 1101 aem_delete(p1); 1102 } 1103 1104 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 1105 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); 1106 MODULE_LICENSE("GPL"); 1107 1108 module_init(aem_init); 1109 module_exit(aem_exit); 1110 1111 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); 1112 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); 1113 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); 1114 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); 1115 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); 1116 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); 1117 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*"); 1118