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 <darrick.wong@oracle.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>
39 #include <linux/err.h>
41 #define REFRESH_INTERVAL (HZ)
42 #define IPMI_TIMEOUT (30 * HZ)
45 #define AEM_NETFN 0x2E
47 #define AEM_FIND_FW_CMD 0x80
48 #define AEM_ELEMENT_CMD 0x81
49 #define AEM_FW_INSTANCE_CMD 0x82
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
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
66 #define AEM_MODULE_TYPE_ID 0x0001
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
73 #define AEM1_NUM_ENERGY_REGS 1
74 #define AEM1_NUM_SENSORS 3
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
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
88 #define AEM_DEFAULT_POWER_INTERVAL 1000
89 #define AEM_MIN_POWER_INTERVAL 200
90 #define UJ_PER_MJ 1000L
92 static DEFINE_IDA(aem_ida);
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,
293 "Unable to register user with IPMI interface %d\n",
301 /* Send an IPMI command */
302 static int aem_send_message(struct aem_ipmi_data *data)
306 err = ipmi_validate_addr(&data->address, sizeof(data->address));
311 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
312 &data->tx_message, data, 0, 0, 0);
318 dev_err(data->bmc_device, "request_settime=%x\n", err);
321 dev_err(data->bmc_device, "validate_addr=%x\n", err);
325 /* Dispatch IPMI messages to callers */
326 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
328 unsigned short rx_len;
329 struct aem_ipmi_data *data = user_msg_data;
331 if (msg->msgid != data->tx_msgid) {
332 dev_err(data->bmc_device,
333 "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n",
335 (int)data->tx_msgid);
336 ipmi_free_recv_msg(msg);
340 data->rx_recv_type = msg->recv_type;
341 if (msg->msg.data_len > 0)
342 data->rx_result = msg->msg.data[0];
344 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE;
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);
353 data->rx_msg_len = 0;
355 ipmi_free_recv_msg(msg);
356 complete(&data->read_complete);
359 /* Sensor support functions */
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)
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;
371 /* AEM registers are 1, 2, 4 or 8 bytes */
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;
387 rs_req.rx_buf_size = size;
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);
393 rs_size = sizeof(*rs_resp) + size;
394 ipmi->rx_msg_data = rs_resp;
395 ipmi->rx_msg_len = rs_size;
397 aem_send_message(ipmi);
399 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
405 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
406 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
414 *x = rs_resp->bytes[0];
419 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
424 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
429 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
439 /* Update AEM energy registers */
440 static void update_aem_energy_one(struct aem_data *data, int which)
442 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
443 &data->energy[which], 8);
446 static void update_aem_energy(struct aem_data *data)
448 update_aem_energy_one(data, 0);
449 if (data->ver_major < 2)
451 update_aem_energy_one(data, 1);
454 /* Update all AEM1 sensors */
455 static void update_aem1_sensors(struct aem_data *data)
457 mutex_lock(&data->lock);
458 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
462 update_aem_energy(data);
464 mutex_unlock(&data->lock);
467 /* Update all AEM2 sensors */
468 static void update_aem2_sensors(struct aem_data *data)
472 mutex_lock(&data->lock);
473 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
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);
481 for (i = POWER_CAP; i <= POWER_AUX; i++)
482 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
485 mutex_unlock(&data->lock);
488 /* Delete an AEM instance */
489 static void aem_delete(struct aem_data *data)
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);
502 /* Probe functions for AEM1 devices */
504 /* Retrieve version and module handle for an AEM1 instance */
505 static int aem_find_aem1_count(struct aem_ipmi_data *data)
508 struct aem_find_firmware_req ff_req;
509 struct aem_find_firmware_resp ff_resp;
511 ff_req.id = system_x_id;
513 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
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);
519 data->rx_msg_data = &ff_resp;
520 data->rx_msg_len = sizeof(ff_resp);
522 aem_send_message(data);
524 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
528 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
529 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
532 return ff_resp.num_instances;
535 /* Find and initialize one AEM1 instance */
536 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
538 struct aem_data *data;
542 data = kzalloc(sizeof(*data), GFP_KERNEL);
545 mutex_init(&data->lock);
547 /* Copy instance data */
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;
554 /* Create sub-device for this fw instance */
555 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
559 data->pdev = platform_device_alloc(DRVNAME, data->id);
562 data->pdev->dev.driver = &aem_driver.driver;
564 res = platform_device_add(data->pdev);
568 platform_set_drvdata(data->pdev, data);
570 /* Set up IPMI interface */
571 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
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",
582 res = PTR_ERR(data->hwmon_dev);
586 data->update = update_aem1_sensors;
587 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
588 if (!data->rs_resp) {
594 res = aem1_find_sensors(data);
598 /* Add to our list of AEM devices */
599 list_add_tail(&data->list, &driver_data.aem_devices);
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);
607 kfree(data->rs_resp);
609 hwmon_device_unregister(data->hwmon_dev);
611 ipmi_destroy_user(data->ipmi.user);
613 platform_set_drvdata(data->pdev, NULL);
614 platform_device_unregister(data->pdev);
616 ida_simple_remove(&aem_ida, data->id);
623 /* Find and initialize all AEM1 instances */
624 static void aem_init_aem1(struct aem_ipmi_data *probe)
628 num = aem_find_aem1_count(probe);
629 for (i = 0; i < num; i++) {
630 err = aem_init_aem1_inst(probe, i);
632 dev_err(probe->bmc_device,
633 "Error %d initializing AEM1 0x%X\n",
639 /* Probe functions for AEM2 devices */
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,
647 struct aem_find_instance_req fi_req;
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);
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);
657 data->rx_msg_data = fi_resp;
658 data->rx_msg_len = sizeof(*fi_resp);
660 aem_send_message(data);
662 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
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)
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)
678 struct aem_data *data;
682 data = kzalloc(sizeof(*data), GFP_KERNEL);
685 mutex_init(&data->lock);
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;
694 /* Create sub-device for this fw instance */
695 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
699 data->pdev = platform_device_alloc(DRVNAME, data->id);
702 data->pdev->dev.driver = &aem_driver.driver;
704 res = platform_device_add(data->pdev);
708 platform_set_drvdata(data->pdev, data);
710 /* Set up IPMI interface */
711 res = aem_init_ipmi_data(&data->ipmi, probe->interface,
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",
722 res = PTR_ERR(data->hwmon_dev);
726 data->update = update_aem2_sensors;
727 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL);
728 if (!data->rs_resp) {
734 res = aem2_find_sensors(data);
738 /* Add to our list of AEM devices */
739 list_add_tail(&data->list, &driver_data.aem_devices);
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);
747 kfree(data->rs_resp);
749 hwmon_device_unregister(data->hwmon_dev);
751 ipmi_destroy_user(data->ipmi.user);
753 platform_set_drvdata(data->pdev, NULL);
754 platform_device_unregister(data->pdev);
756 ida_simple_remove(&aem_ida, data->id);
763 /* Find and initialize all AEM2 instances */
764 static void aem_init_aem2(struct aem_ipmi_data *probe)
766 struct aem_find_instance_resp fi_resp;
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",
778 err = aem_init_aem2_inst(probe, &fi_resp);
780 dev_err(probe->bmc_device,
781 "Error %d initializing AEM2 0x%X\n",
782 err, fi_resp.module_handle);
788 /* Probe a BMC for AEM firmware instances */
789 static void aem_register_bmc(int iface, struct device *dev)
791 struct aem_ipmi_data probe;
793 if (aem_init_ipmi_data(&probe, iface, dev))
796 /* Ignore probe errors; they won't cause problems */
797 aem_init_aem1(&probe);
798 aem_init_aem2(&probe);
800 ipmi_destroy_user(probe.user);
803 /* Handle BMC deletion */
804 static void aem_bmc_gone(int iface)
806 struct aem_data *p1, *next1;
808 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
809 if (p1->ipmi.interface == iface)
813 /* sysfs support functions */
815 /* AEM device name */
816 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
819 struct aem_data *data = dev_get_drvdata(dev);
821 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
823 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
825 /* AEM device version */
826 static ssize_t show_version(struct device *dev,
827 struct device_attribute *devattr,
830 struct aem_data *data = dev_get_drvdata(dev);
832 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
834 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
836 /* Display power use */
837 static ssize_t aem_show_power(struct device *dev,
838 struct device_attribute *devattr,
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 struct timespec b, a;
847 mutex_lock(&data->lock);
848 update_aem_energy_one(data, attr->index);
850 before = data->energy[attr->index];
852 leftover = schedule_timeout_interruptible(
853 msecs_to_jiffies(data->power_period[attr->index])
856 mutex_unlock(&data->lock);
860 update_aem_energy_one(data, attr->index);
862 after = data->energy[attr->index];
863 mutex_unlock(&data->lock);
865 time = timespec_to_ns(&a) - timespec_to_ns(&b);
866 delta = (after - before) * UJ_PER_MJ;
868 return sprintf(buf, "%llu\n",
869 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
872 /* Display energy use */
873 static ssize_t aem_show_energy(struct device *dev,
874 struct device_attribute *devattr,
877 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
878 struct aem_data *a = dev_get_drvdata(dev);
879 mutex_lock(&a->lock);
880 update_aem_energy_one(a, attr->index);
881 mutex_unlock(&a->lock);
883 return sprintf(buf, "%llu\n",
884 (unsigned long long)a->energy[attr->index] * 1000);
887 /* Display power interval registers */
888 static ssize_t aem_show_power_period(struct device *dev,
889 struct device_attribute *devattr,
892 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
893 struct aem_data *a = dev_get_drvdata(dev);
896 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
899 /* Set power interval registers */
900 static ssize_t aem_set_power_period(struct device *dev,
901 struct device_attribute *devattr,
902 const char *buf, size_t count)
904 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
905 struct aem_data *a = dev_get_drvdata(dev);
909 res = kstrtoul(buf, 10, &temp);
913 if (temp < AEM_MIN_POWER_INTERVAL)
916 mutex_lock(&a->lock);
917 a->power_period[attr->index] = temp;
918 mutex_unlock(&a->lock);
923 /* Discover sensors on an AEM device */
924 static int aem_register_sensors(struct aem_data *data,
925 struct aem_ro_sensor_template *ro,
926 struct aem_rw_sensor_template *rw)
928 struct device *dev = &data->pdev->dev;
929 struct sensor_device_attribute *sensors = data->sensors;
932 /* Set up read-only sensors */
934 sysfs_attr_init(&sensors->dev_attr.attr);
935 sensors->dev_attr.attr.name = ro->label;
936 sensors->dev_attr.attr.mode = S_IRUGO;
937 sensors->dev_attr.show = ro->show;
938 sensors->index = ro->index;
940 err = device_create_file(dev, &sensors->dev_attr);
942 sensors->dev_attr.attr.name = NULL;
949 /* Set up read-write sensors */
951 sysfs_attr_init(&sensors->dev_attr.attr);
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;
958 err = device_create_file(dev, &sensors->dev_attr);
960 sensors->dev_attr.attr.name = NULL;
967 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
970 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
974 aem_remove_sensors(data);
978 /* sysfs support functions for AEM2 sensors */
980 /* Display temperature use */
981 static ssize_t aem2_show_temp(struct device *dev,
982 struct device_attribute *devattr,
985 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
986 struct aem_data *a = dev_get_drvdata(dev);
989 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
992 /* Display power-capping registers */
993 static ssize_t aem2_show_pcap_value(struct device *dev,
994 struct device_attribute *devattr,
997 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
998 struct aem_data *a = dev_get_drvdata(dev);
1001 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1004 /* Remove sensors attached to an AEM device */
1005 static void aem_remove_sensors(struct aem_data *data)
1009 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1010 if (!data->sensors[i].dev_attr.attr.name)
1012 device_remove_file(&data->pdev->dev,
1013 &data->sensors[i].dev_attr);
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);
1022 /* Sensor probe functions */
1024 /* Description of AEM1 sensors */
1025 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1026 {"energy1_input", aem_show_energy, 0},
1027 {"power1_average", aem_show_power, 0},
1031 static 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},
1036 /* Description of AEM2 sensors */
1037 static 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},
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},
1050 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1051 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1055 static 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},
1061 /* Set up AEM1 sensor attrs */
1062 static int aem1_find_sensors(struct aem_data *data)
1064 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1067 /* Set up AEM2 sensor attrs */
1068 static int aem2_find_sensors(struct aem_data *data)
1070 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1073 /* Module init/exit routines */
1075 static int __init aem_init(void)
1079 res = driver_register(&aem_driver.driver);
1081 pr_err("Can't register aem driver\n");
1085 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1091 driver_unregister(&aem_driver.driver);
1096 static void __exit aem_exit(void)
1098 struct aem_data *p1, *next1;
1100 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1101 driver_unregister(&aem_driver.driver);
1102 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1106 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
1107 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1108 MODULE_LICENSE("GPL");
1110 module_init(aem_init);
1111 module_exit(aem_exit);
1113 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1114 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1115 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1116 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1117 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1118 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1119 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");