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
6 * Author: Darrick J. Wong <djwong@us.ibm.com>
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.
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.
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
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
40 #define REFRESH_INTERVAL (HZ)
41 #define IPMI_TIMEOUT (30 * HZ)
44 #define AEM_NETFN 0x2E
46 #define AEM_FIND_FW_CMD 0x80
47 #define AEM_ELEMENT_CMD 0x81
48 #define AEM_FW_INSTANCE_CMD 0x82
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
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
65 #define AEM_MODULE_TYPE_ID 0x0001
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
72 #define AEM1_NUM_ENERGY_REGS 1
73 #define AEM1_NUM_SENSORS 3
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
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
87 #define AEM_DEFAULT_POWER_INTERVAL 1000
88 #define AEM_MIN_POWER_INTERVAL 200
89 #define UJ_PER_MJ 1000L
91 static DEFINE_IDR(aem_idr);
92 static DEFINE_SPINLOCK(aem_idr_lock);
94 static struct platform_driver aem_driver = {
97 .bus = &platform_bus_type,
101 struct aem_ipmi_data {
102 struct completion read_complete;
103 struct ipmi_addr address;
107 struct kernel_ipmi_msg tx_message;
111 unsigned short rx_msg_len;
112 unsigned char rx_result;
115 struct device *bmc_device;
118 struct aem_ro_sensor_template {
120 ssize_t (*show)(struct device *dev,
121 struct device_attribute *devattr,
126 struct aem_rw_sensor_template {
128 ssize_t (*show)(struct device *dev,
129 struct device_attribute *devattr,
131 ssize_t (*set)(struct device *dev,
132 struct device_attribute *devattr,
133 const char *buf, size_t count);
138 struct list_head list;
140 struct device *hwmon_dev;
141 struct platform_device *pdev;
144 unsigned long last_updated; /* In jiffies */
149 struct aem_ipmi_data ipmi;
151 /* Function and buffer to update sensors */
152 void (*update)(struct aem_data *data);
153 struct aem_read_sensor_resp *rs_resp;
164 * Two temperature sensors
165 * Six power cap registers
169 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
171 /* energy use in mJ */
172 u64 energy[AEM_NUM_ENERGY_REGS];
174 /* power sampling interval in ms */
175 unsigned long power_period[AEM_NUM_ENERGY_REGS];
177 /* Everything past here is for AEM2 only */
179 /* power caps in dW */
180 u16 pcap[AEM2_NUM_PCAP_REGS];
182 /* exhaust temperature in C */
183 u8 temp[AEM2_NUM_TEMP_REGS];
186 /* Data structures returned by the AEM firmware */
190 static struct aem_iana_id system_x_id = {
191 .bytes = {0x4D, 0x4F, 0x00}
194 /* These are used to find AEM1 instances */
195 struct aem_find_firmware_req {
196 struct aem_iana_id id;
199 __be16 module_type_id;
202 struct aem_find_firmware_resp {
203 struct aem_iana_id id;
207 /* These are used to find AEM2 instances */
208 struct aem_find_instance_req {
209 struct aem_iana_id id;
211 __be16 module_type_id;
214 struct aem_find_instance_resp {
215 struct aem_iana_id id;
223 /* These are used to query sensors */
224 struct aem_read_sensor_req {
225 struct aem_iana_id id;
233 struct aem_read_sensor_resp {
234 struct aem_iana_id id;
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;
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);
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);
255 static struct aem_driver_data driver_data = {
256 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
258 .owner = THIS_MODULE,
259 .new_smi = aem_register_bmc,
260 .smi_gone = aem_bmc_gone,
263 .ipmi_recv_hndl = aem_msg_handler,
267 /* Functions to talk to the IPMI layer */
269 /* Initialize IPMI address, message buffers and user data */
270 static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
275 init_completion(&data->read_complete);
276 data->bmc_device = bmc;
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;
284 /* Initialize message buffers */
286 data->tx_message.netfn = AEM_NETFN;
288 /* Create IPMI messaging interface user */
289 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
292 dev_err(bmc, "Unable to register user with IPMI "
293 "interface %d\n", data->interface);
300 /* Send an IPMI command */
301 static int aem_send_message(struct aem_ipmi_data *data)
305 err = ipmi_validate_addr(&data->address, sizeof(data->address));
310 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
311 &data->tx_message, data, 0, 0, 0);
317 dev_err(data->bmc_device, "request_settime=%x\n", err);
320 dev_err(data->bmc_device, "validate_addr=%x\n", err);
324 /* Dispatch IPMI messages to callers */
325 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
327 unsigned short rx_len;
328 struct aem_ipmi_data *data = user_msg_data;
330 if (msg->msgid != data->tx_msgid) {
331 dev_err(data->bmc_device, "Mismatch between received msgid "
332 "(%02x) and transmitted msgid (%02x)!\n",
334 (int)data->tx_msgid);
335 ipmi_free_recv_msg(msg);
339 data->rx_recv_type = msg->recv_type;
340 if (msg->msg.data_len > 0)
341 data->rx_result = msg->msg.data[0];
343 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
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);
352 data->rx_msg_len = 0;
354 ipmi_free_recv_msg(msg);
355 complete(&data->read_complete);
361 static int aem_idr_get(int *id)
366 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
369 spin_lock(&aem_idr_lock);
370 err = idr_get_new(&aem_idr, NULL, &i);
371 spin_unlock(&aem_idr_lock);
373 if (unlikely(err == -EAGAIN))
375 else if (unlikely(err))
378 *id = i & MAX_ID_MASK;
382 /* Release an object ID */
383 static void aem_idr_put(int id)
385 spin_lock(&aem_idr_lock);
386 idr_remove(&aem_idr, id);
387 spin_unlock(&aem_idr_lock);
390 /* Sensor support functions */
392 /* Read a sensor value; must be called with data->lock held */
393 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
394 void *buf, size_t size)
397 struct aem_read_sensor_req rs_req;
398 /* Use preallocated rx buffer */
399 struct aem_read_sensor_resp *rs_resp = data->rs_resp;
400 struct aem_ipmi_data *ipmi = &data->ipmi;
402 /* AEM registers are 1, 2, 4 or 8 bytes */
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;
418 rs_req.rx_buf_size = size;
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);
424 rs_size = sizeof(*rs_resp) + size;
425 ipmi->rx_msg_data = rs_resp;
426 ipmi->rx_msg_len = rs_size;
428 aem_send_message(ipmi);
430 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
436 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
437 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
445 *x = rs_resp->bytes[0];
450 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
455 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
460 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
470 /* Update AEM energy registers */
471 static void update_aem_energy_one(struct aem_data *data, int which)
473 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
474 &data->energy[which], 8);
477 static void update_aem_energy(struct aem_data *data)
479 update_aem_energy_one(data, 0);
480 if (data->ver_major < 2)
482 update_aem_energy_one(data, 1);
485 /* Update all AEM1 sensors */
486 static void update_aem1_sensors(struct aem_data *data)
488 mutex_lock(&data->lock);
489 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
493 update_aem_energy(data);
495 mutex_unlock(&data->lock);
498 /* Update all AEM2 sensors */
499 static void update_aem2_sensors(struct aem_data *data)
503 mutex_lock(&data->lock);
504 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
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);
512 for (i = POWER_CAP; i <= POWER_AUX; i++)
513 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
516 mutex_unlock(&data->lock);
519 /* Delete an AEM instance */
520 static void aem_delete(struct aem_data *data)
522 list_del(&data->list);
523 aem_remove_sensors(data);
524 kfree(data->rs_resp);
525 hwmon_device_unregister(data->hwmon_dev);
526 ipmi_destroy_user(data->ipmi.user);
527 platform_set_drvdata(data->pdev, NULL);
528 platform_device_unregister(data->pdev);
529 aem_idr_put(data->id);
533 /* Probe functions for AEM1 devices */
535 /* Retrieve version and module handle for an AEM1 instance */
536 static int aem_find_aem1_count(struct aem_ipmi_data *data)
539 struct aem_find_firmware_req ff_req;
540 struct aem_find_firmware_resp ff_resp;
542 ff_req.id = system_x_id;
544 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
546 data->tx_message.cmd = AEM_FIND_FW_CMD;
547 data->tx_message.data = (char *)&ff_req;
548 data->tx_message.data_len = sizeof(ff_req);
550 data->rx_msg_data = &ff_resp;
551 data->rx_msg_len = sizeof(ff_resp);
553 aem_send_message(data);
555 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
559 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
560 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
563 return ff_resp.num_instances;
566 /* Find and initialize one AEM1 instance */
567 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
569 struct aem_data *data;
573 data = kzalloc(sizeof(*data), GFP_KERNEL);
576 mutex_init(&data->lock);
578 /* Copy instance data */
581 data->module_handle = module_handle;
582 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
583 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
585 /* Create sub-device for this fw instance */
586 if (aem_idr_get(&data->id))
589 data->pdev = platform_device_alloc(DRVNAME, data->id);
592 data->pdev->dev.driver = &aem_driver.driver;
594 res = platform_device_add(data->pdev);
598 platform_set_drvdata(data->pdev, data);
600 /* Set up IPMI interface */
601 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
606 /* Register with hwmon */
607 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
608 if (IS_ERR(data->hwmon_dev)) {
609 dev_err(&data->pdev->dev, "Unable to register hwmon "
610 "device for IPMI interface %d\n",
612 res = PTR_ERR(data->hwmon_dev);
616 data->update = update_aem1_sensors;
617 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
618 if (!data->rs_resp) {
624 res = aem1_find_sensors(data);
628 /* Add to our list of AEM devices */
629 list_add_tail(&data->list, &driver_data.aem_devices);
631 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
632 data->ver_major, data->ver_minor,
633 data->module_handle);
637 kfree(data->rs_resp);
639 hwmon_device_unregister(data->hwmon_dev);
641 ipmi_destroy_user(data->ipmi.user);
643 platform_set_drvdata(data->pdev, NULL);
644 platform_device_unregister(data->pdev);
646 aem_idr_put(data->id);
653 /* Find and initialize all AEM1 instances */
654 static void aem_init_aem1(struct aem_ipmi_data *probe)
658 num = aem_find_aem1_count(probe);
659 for (i = 0; i < num; i++) {
660 err = aem_init_aem1_inst(probe, i);
662 dev_err(probe->bmc_device,
663 "Error %d initializing AEM1 0x%X\n",
669 /* Probe functions for AEM2 devices */
671 /* Retrieve version and module handle for an AEM2 instance */
672 static int aem_find_aem2(struct aem_ipmi_data *data,
673 struct aem_find_instance_resp *fi_resp,
677 struct aem_find_instance_req fi_req;
679 fi_req.id = system_x_id;
680 fi_req.instance_number = instance_num;
681 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
683 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
684 data->tx_message.data = (char *)&fi_req;
685 data->tx_message.data_len = sizeof(fi_req);
687 data->rx_msg_data = fi_resp;
688 data->rx_msg_len = sizeof(*fi_resp);
690 aem_send_message(data);
692 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
696 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
697 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
698 fi_resp->num_instances <= instance_num)
704 /* Find and initialize one AEM2 instance */
705 static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
706 struct aem_find_instance_resp *fi_resp)
708 struct aem_data *data;
712 data = kzalloc(sizeof(*data), GFP_KERNEL);
715 mutex_init(&data->lock);
717 /* Copy instance data */
718 data->ver_major = fi_resp->major;
719 data->ver_minor = fi_resp->minor;
720 data->module_handle = fi_resp->module_handle;
721 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
722 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
724 /* Create sub-device for this fw instance */
725 if (aem_idr_get(&data->id))
728 data->pdev = platform_device_alloc(DRVNAME, data->id);
731 data->pdev->dev.driver = &aem_driver.driver;
733 res = platform_device_add(data->pdev);
737 platform_set_drvdata(data->pdev, data);
739 /* Set up IPMI interface */
740 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
745 /* Register with hwmon */
746 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
747 if (IS_ERR(data->hwmon_dev)) {
748 dev_err(&data->pdev->dev, "Unable to register hwmon "
749 "device for IPMI interface %d\n",
751 res = PTR_ERR(data->hwmon_dev);
755 data->update = update_aem2_sensors;
756 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
757 if (!data->rs_resp) {
763 res = aem2_find_sensors(data);
767 /* Add to our list of AEM devices */
768 list_add_tail(&data->list, &driver_data.aem_devices);
770 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
771 data->ver_major, data->ver_minor,
772 data->module_handle);
776 kfree(data->rs_resp);
778 hwmon_device_unregister(data->hwmon_dev);
780 ipmi_destroy_user(data->ipmi.user);
782 platform_set_drvdata(data->pdev, NULL);
783 platform_device_unregister(data->pdev);
785 aem_idr_put(data->id);
792 /* Find and initialize all AEM2 instances */
793 static void aem_init_aem2(struct aem_ipmi_data *probe)
795 struct aem_find_instance_resp fi_resp;
799 while (!aem_find_aem2(probe, &fi_resp, i)) {
800 if (fi_resp.major != 2) {
801 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
802 "report this to the maintainer.\n",
807 err = aem_init_aem2_inst(probe, &fi_resp);
809 dev_err(probe->bmc_device,
810 "Error %d initializing AEM2 0x%X\n",
811 err, fi_resp.module_handle);
817 /* Probe a BMC for AEM firmware instances */
818 static void aem_register_bmc(int iface, struct device *dev)
820 struct aem_ipmi_data probe;
822 if (aem_init_ipmi_data(&probe, iface, dev))
825 /* Ignore probe errors; they won't cause problems */
826 aem_init_aem1(&probe);
827 aem_init_aem2(&probe);
829 ipmi_destroy_user(probe.user);
832 /* Handle BMC deletion */
833 static void aem_bmc_gone(int iface)
835 struct aem_data *p1, *next1;
837 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
838 if (p1->ipmi.interface == iface)
842 /* sysfs support functions */
844 /* AEM device name */
845 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
848 struct aem_data *data = dev_get_drvdata(dev);
850 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
852 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
854 /* AEM device version */
855 static ssize_t show_version(struct device *dev,
856 struct device_attribute *devattr,
859 struct aem_data *data = dev_get_drvdata(dev);
861 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
863 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
865 /* Display power use */
866 static ssize_t aem_show_power(struct device *dev,
867 struct device_attribute *devattr,
870 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
871 struct aem_data *data = dev_get_drvdata(dev);
872 u64 before, after, delta, time;
873 signed long leftover;
874 struct timespec b, a;
876 mutex_lock(&data->lock);
877 update_aem_energy_one(data, attr->index);
879 before = data->energy[attr->index];
881 leftover = schedule_timeout_interruptible(
882 msecs_to_jiffies(data->power_period[attr->index])
885 mutex_unlock(&data->lock);
889 update_aem_energy_one(data, attr->index);
891 after = data->energy[attr->index];
892 mutex_unlock(&data->lock);
894 time = timespec_to_ns(&a) - timespec_to_ns(&b);
895 delta = (after - before) * UJ_PER_MJ;
897 return sprintf(buf, "%llu\n",
898 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
901 /* Display energy use */
902 static ssize_t aem_show_energy(struct device *dev,
903 struct device_attribute *devattr,
906 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
907 struct aem_data *a = dev_get_drvdata(dev);
908 mutex_lock(&a->lock);
909 update_aem_energy_one(a, attr->index);
910 mutex_unlock(&a->lock);
912 return sprintf(buf, "%llu\n",
913 (unsigned long long)a->energy[attr->index] * 1000);
916 /* Display power interval registers */
917 static ssize_t aem_show_power_period(struct device *dev,
918 struct device_attribute *devattr,
921 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
922 struct aem_data *a = dev_get_drvdata(dev);
925 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
928 /* Set power interval registers */
929 static ssize_t aem_set_power_period(struct device *dev,
930 struct device_attribute *devattr,
931 const char *buf, size_t count)
933 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
934 struct aem_data *a = dev_get_drvdata(dev);
938 res = strict_strtoul(buf, 10, &temp);
942 if (temp < AEM_MIN_POWER_INTERVAL)
945 mutex_lock(&a->lock);
946 a->power_period[attr->index] = temp;
947 mutex_unlock(&a->lock);
952 /* Discover sensors on an AEM device */
953 static int aem_register_sensors(struct aem_data *data,
954 struct aem_ro_sensor_template *ro,
955 struct aem_rw_sensor_template *rw)
957 struct device *dev = &data->pdev->dev;
958 struct sensor_device_attribute *sensors = data->sensors;
961 /* Set up read-only sensors */
963 sysfs_attr_init(&sensors->dev_attr.attr);
964 sensors->dev_attr.attr.name = ro->label;
965 sensors->dev_attr.attr.mode = S_IRUGO;
966 sensors->dev_attr.show = ro->show;
967 sensors->index = ro->index;
969 err = device_create_file(dev, &sensors->dev_attr);
971 sensors->dev_attr.attr.name = NULL;
978 /* Set up read-write sensors */
980 sysfs_attr_init(&sensors->dev_attr.attr);
981 sensors->dev_attr.attr.name = rw->label;
982 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
983 sensors->dev_attr.show = rw->show;
984 sensors->dev_attr.store = rw->set;
985 sensors->index = rw->index;
987 err = device_create_file(dev, &sensors->dev_attr);
989 sensors->dev_attr.attr.name = NULL;
996 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
999 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
1003 aem_remove_sensors(data);
1007 /* sysfs support functions for AEM2 sensors */
1009 /* Display temperature use */
1010 static ssize_t aem2_show_temp(struct device *dev,
1011 struct device_attribute *devattr,
1014 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1015 struct aem_data *a = dev_get_drvdata(dev);
1018 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
1021 /* Display power-capping registers */
1022 static ssize_t aem2_show_pcap_value(struct device *dev,
1023 struct device_attribute *devattr,
1026 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1027 struct aem_data *a = dev_get_drvdata(dev);
1030 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1033 /* Remove sensors attached to an AEM device */
1034 static void aem_remove_sensors(struct aem_data *data)
1038 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1039 if (!data->sensors[i].dev_attr.attr.name)
1041 device_remove_file(&data->pdev->dev,
1042 &data->sensors[i].dev_attr);
1045 device_remove_file(&data->pdev->dev,
1046 &sensor_dev_attr_name.dev_attr);
1047 device_remove_file(&data->pdev->dev,
1048 &sensor_dev_attr_version.dev_attr);
1051 /* Sensor probe functions */
1053 /* Description of AEM1 sensors */
1054 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1055 {"energy1_input", aem_show_energy, 0},
1056 {"power1_average", aem_show_power, 0},
1060 static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1061 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1062 {NULL, NULL, NULL, 0},
1065 /* Description of AEM2 sensors */
1066 static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1067 {"energy1_input", aem_show_energy, 0},
1068 {"energy2_input", aem_show_energy, 1},
1069 {"power1_average", aem_show_power, 0},
1070 {"power2_average", aem_show_power, 1},
1071 {"temp1_input", aem2_show_temp, 0},
1072 {"temp2_input", aem2_show_temp, 1},
1074 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1075 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1076 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1077 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1079 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1080 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1084 static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1085 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1086 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1087 {NULL, NULL, NULL, 0},
1090 /* Set up AEM1 sensor attrs */
1091 static int aem1_find_sensors(struct aem_data *data)
1093 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1096 /* Set up AEM2 sensor attrs */
1097 static int aem2_find_sensors(struct aem_data *data)
1099 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1102 /* Module init/exit routines */
1104 static int __init aem_init(void)
1108 res = driver_register(&aem_driver.driver);
1110 pr_err("Can't register aem driver\n");
1114 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1120 driver_unregister(&aem_driver.driver);
1125 static void __exit aem_exit(void)
1127 struct aem_data *p1, *next1;
1129 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1130 driver_unregister(&aem_driver.driver);
1131 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1135 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1136 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1137 MODULE_LICENSE("GPL");
1139 module_init(aem_init);
1140 module_exit(aem_exit);
1142 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1143 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1144 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1145 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1146 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1147 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1148 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");