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_IDA(aem_ida);
93 static struct platform_driver aem_driver = {
96 .bus = &platform_bus_type,
100 struct aem_ipmi_data {
101 struct completion read_complete;
102 struct ipmi_addr address;
106 struct kernel_ipmi_msg tx_message;
110 unsigned short rx_msg_len;
111 unsigned char rx_result;
114 struct device *bmc_device;
117 struct aem_ro_sensor_template {
119 ssize_t (*show)(struct device *dev,
120 struct device_attribute *devattr,
125 struct aem_rw_sensor_template {
127 ssize_t (*show)(struct device *dev,
128 struct device_attribute *devattr,
130 ssize_t (*set)(struct device *dev,
131 struct device_attribute *devattr,
132 const char *buf, size_t count);
137 struct list_head list;
139 struct device *hwmon_dev;
140 struct platform_device *pdev;
143 unsigned long last_updated; /* In jiffies */
148 struct aem_ipmi_data ipmi;
150 /* Function to update sensors */
151 void (*update)(struct aem_data *data);
162 * Two temperature sensors
163 * Six power cap registers
167 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
169 /* energy use in mJ */
170 u64 energy[AEM_NUM_ENERGY_REGS];
172 /* power sampling interval in ms */
173 unsigned long power_period[AEM_NUM_ENERGY_REGS];
175 /* Everything past here is for AEM2 only */
177 /* power caps in dW */
178 u16 pcap[AEM2_NUM_PCAP_REGS];
180 /* exhaust temperature in C */
181 u8 temp[AEM2_NUM_TEMP_REGS];
184 /* Data structures returned by the AEM firmware */
188 static struct aem_iana_id system_x_id = {
189 .bytes = {0x4D, 0x4F, 0x00}
192 /* These are used to find AEM1 instances */
193 struct aem_find_firmware_req {
194 struct aem_iana_id id;
197 __be16 module_type_id;
200 struct aem_find_firmware_resp {
201 struct aem_iana_id id;
205 /* These are used to find AEM2 instances */
206 struct aem_find_instance_req {
207 struct aem_iana_id id;
209 __be16 module_type_id;
212 struct aem_find_instance_resp {
213 struct aem_iana_id id;
221 /* These are used to query sensors */
222 struct aem_read_sensor_req {
223 struct aem_iana_id id;
231 struct aem_read_sensor_resp {
232 struct aem_iana_id id;
236 /* Data structures to talk to the IPMI layer */
237 struct aem_driver_data {
238 struct list_head aem_devices;
239 struct ipmi_smi_watcher bmc_events;
240 struct ipmi_user_hndl ipmi_hndlrs;
243 static void aem_register_bmc(int iface, struct device *dev);
244 static void aem_bmc_gone(int iface);
245 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
247 static void aem_remove_sensors(struct aem_data *data);
248 static int aem_init_aem1(struct aem_ipmi_data *probe);
249 static int aem_init_aem2(struct aem_ipmi_data *probe);
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);
358 /* Sensor support functions */
360 /* Read a sensor value */
361 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
362 void *buf, size_t size)
365 struct aem_read_sensor_req rs_req;
366 struct aem_read_sensor_resp *rs_resp;
367 struct aem_ipmi_data *ipmi = &data->ipmi;
369 /* AEM registers are 1, 2, 4 or 8 bytes */
380 rs_req.id = system_x_id;
381 rs_req.module_handle = data->module_handle;
382 rs_req.element = elt;
383 rs_req.subcommand = AEM_READ_REGISTER;
385 rs_req.rx_buf_size = size;
387 ipmi->tx_message.cmd = AEM_ELEMENT_CMD;
388 ipmi->tx_message.data = (char *)&rs_req;
389 ipmi->tx_message.data_len = sizeof(rs_req);
391 rs_size = sizeof(*rs_resp) + size;
392 rs_resp = kzalloc(rs_size, GFP_KERNEL);
396 ipmi->rx_msg_data = rs_resp;
397 ipmi->rx_msg_len = rs_size;
399 aem_send_message(ipmi);
401 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
407 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
408 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
416 *x = rs_resp->bytes[0];
421 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
426 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
431 *x = be64_to_cpup((__be64 *)rs_resp->bytes);
442 /* Update AEM energy registers */
443 static void update_aem_energy_one(struct aem_data *data, int which)
445 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which,
446 &data->energy[which], 8);
449 static void update_aem_energy(struct aem_data *data)
451 update_aem_energy_one(data, 0);
452 if (data->ver_major < 2)
454 update_aem_energy_one(data, 1);
457 /* Update all AEM1 sensors */
458 static void update_aem1_sensors(struct aem_data *data)
460 mutex_lock(&data->lock);
461 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
465 update_aem_energy(data);
467 mutex_unlock(&data->lock);
470 /* Update all AEM2 sensors */
471 static void update_aem2_sensors(struct aem_data *data)
475 mutex_lock(&data->lock);
476 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
480 update_aem_energy(data);
481 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1);
482 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1);
484 for (i = POWER_CAP; i <= POWER_AUX; i++)
485 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i,
488 mutex_unlock(&data->lock);
491 /* Delete an AEM instance */
492 static void aem_delete(struct aem_data *data)
494 list_del(&data->list);
495 aem_remove_sensors(data);
496 hwmon_device_unregister(data->hwmon_dev);
497 ipmi_destroy_user(data->ipmi.user);
498 platform_set_drvdata(data->pdev, NULL);
499 platform_device_unregister(data->pdev);
500 ida_simple_remove(&aem_ida, data->id);
504 /* Probe functions for AEM1 devices */
506 /* Retrieve version and module handle for an AEM1 instance */
507 static int aem_find_aem1_count(struct aem_ipmi_data *data)
510 struct aem_find_firmware_req ff_req;
511 struct aem_find_firmware_resp ff_resp;
513 ff_req.id = system_x_id;
515 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
517 data->tx_message.cmd = AEM_FIND_FW_CMD;
518 data->tx_message.data = (char *)&ff_req;
519 data->tx_message.data_len = sizeof(ff_req);
521 data->rx_msg_data = &ff_resp;
522 data->rx_msg_len = sizeof(ff_resp);
524 aem_send_message(data);
526 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
530 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
531 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
534 return ff_resp.num_instances;
537 /* Find and initialize one AEM1 instance */
538 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
540 struct aem_data *data;
544 data = kzalloc(sizeof(*data), GFP_KERNEL);
547 mutex_init(&data->lock);
549 /* Copy instance data */
552 data->module_handle = module_handle;
553 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
554 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
556 /* Create sub-device for this fw instance */
557 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
561 data->pdev = platform_device_alloc(DRVNAME, data->id);
564 data->pdev->dev.driver = &aem_driver.driver;
566 res = platform_device_add(data->pdev);
570 platform_set_drvdata(data->pdev, data);
572 /* Set up IPMI interface */
573 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
577 /* Register with hwmon */
578 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
580 if (IS_ERR(data->hwmon_dev)) {
581 dev_err(&data->pdev->dev, "Unable to register hwmon "
582 "device for IPMI interface %d\n",
587 data->update = update_aem1_sensors;
590 if (aem1_find_sensors(data))
593 /* Add to our list of AEM devices */
594 list_add_tail(&data->list, &driver_data.aem_devices);
596 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
597 data->ver_major, data->ver_minor,
598 data->module_handle);
602 hwmon_device_unregister(data->hwmon_dev);
604 ipmi_destroy_user(data->ipmi.user);
606 platform_set_drvdata(data->pdev, NULL);
607 platform_device_unregister(data->pdev);
609 ida_simple_remove(&aem_ida, data->id);
616 /* Find and initialize all AEM1 instances */
617 static int aem_init_aem1(struct aem_ipmi_data *probe)
621 num = aem_find_aem1_count(probe);
622 for (i = 0; i < num; i++) {
623 err = aem_init_aem1_inst(probe, i);
625 dev_err(probe->bmc_device,
626 "Error %d initializing AEM1 0x%X\n",
635 /* Probe functions for AEM2 devices */
637 /* Retrieve version and module handle for an AEM2 instance */
638 static int aem_find_aem2(struct aem_ipmi_data *data,
639 struct aem_find_instance_resp *fi_resp,
643 struct aem_find_instance_req fi_req;
645 fi_req.id = system_x_id;
646 fi_req.instance_number = instance_num;
647 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
649 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
650 data->tx_message.data = (char *)&fi_req;
651 data->tx_message.data_len = sizeof(fi_req);
653 data->rx_msg_data = fi_resp;
654 data->rx_msg_len = sizeof(*fi_resp);
656 aem_send_message(data);
658 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
662 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
663 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
664 fi_resp->num_instances <= instance_num)
670 /* Find and initialize one AEM2 instance */
671 static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
672 struct aem_find_instance_resp *fi_resp)
674 struct aem_data *data;
678 data = kzalloc(sizeof(*data), GFP_KERNEL);
681 mutex_init(&data->lock);
683 /* Copy instance data */
684 data->ver_major = fi_resp->major;
685 data->ver_minor = fi_resp->minor;
686 data->module_handle = fi_resp->module_handle;
687 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
688 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
690 /* Create sub-device for this fw instance */
691 data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL);
695 data->pdev = platform_device_alloc(DRVNAME, data->id);
698 data->pdev->dev.driver = &aem_driver.driver;
700 res = platform_device_add(data->pdev);
704 platform_set_drvdata(data->pdev, data);
706 /* Set up IPMI interface */
707 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
711 /* Register with hwmon */
712 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
714 if (IS_ERR(data->hwmon_dev)) {
715 dev_err(&data->pdev->dev, "Unable to register hwmon "
716 "device for IPMI interface %d\n",
721 data->update = update_aem2_sensors;
724 if (aem2_find_sensors(data))
727 /* Add to our list of AEM devices */
728 list_add_tail(&data->list, &driver_data.aem_devices);
730 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
731 data->ver_major, data->ver_minor,
732 data->module_handle);
736 hwmon_device_unregister(data->hwmon_dev);
738 ipmi_destroy_user(data->ipmi.user);
740 platform_set_drvdata(data->pdev, NULL);
741 platform_device_unregister(data->pdev);
743 ida_simple_remove(&aem_ida, data->id);
750 /* Find and initialize all AEM2 instances */
751 static int aem_init_aem2(struct aem_ipmi_data *probe)
753 struct aem_find_instance_resp fi_resp;
757 while (!aem_find_aem2(probe, &fi_resp, i)) {
758 if (fi_resp.major != 2) {
759 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
760 "report this to the maintainer.\n",
765 err = aem_init_aem2_inst(probe, &fi_resp);
767 dev_err(probe->bmc_device,
768 "Error %d initializing AEM2 0x%X\n",
769 err, fi_resp.module_handle);
778 /* Probe a BMC for AEM firmware instances */
779 static void aem_register_bmc(int iface, struct device *dev)
781 struct aem_ipmi_data probe;
783 if (aem_init_ipmi_data(&probe, iface, dev))
786 /* Ignore probe errors; they won't cause problems */
787 aem_init_aem1(&probe);
788 aem_init_aem2(&probe);
790 ipmi_destroy_user(probe.user);
793 /* Handle BMC deletion */
794 static void aem_bmc_gone(int iface)
796 struct aem_data *p1, *next1;
798 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
799 if (p1->ipmi.interface == iface)
803 /* sysfs support functions */
805 /* AEM device name */
806 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
809 struct aem_data *data = dev_get_drvdata(dev);
811 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
813 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
815 /* AEM device version */
816 static ssize_t show_version(struct device *dev,
817 struct device_attribute *devattr,
820 struct aem_data *data = dev_get_drvdata(dev);
822 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
824 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
826 /* Display power use */
827 static ssize_t aem_show_power(struct device *dev,
828 struct device_attribute *devattr,
831 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
832 struct aem_data *data = dev_get_drvdata(dev);
833 u64 before, after, delta, time;
834 signed long leftover;
835 struct timespec b, a;
837 mutex_lock(&data->lock);
838 update_aem_energy_one(data, attr->index);
840 before = data->energy[attr->index];
842 leftover = schedule_timeout_interruptible(
843 msecs_to_jiffies(data->power_period[attr->index])
846 mutex_unlock(&data->lock);
850 update_aem_energy_one(data, attr->index);
852 after = data->energy[attr->index];
853 mutex_unlock(&data->lock);
855 time = timespec_to_ns(&a) - timespec_to_ns(&b);
856 delta = (after - before) * UJ_PER_MJ;
858 return sprintf(buf, "%llu\n",
859 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
862 /* Display energy use */
863 static ssize_t aem_show_energy(struct device *dev,
864 struct device_attribute *devattr,
867 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
868 struct aem_data *a = dev_get_drvdata(dev);
869 mutex_lock(&a->lock);
870 update_aem_energy_one(a, attr->index);
871 mutex_unlock(&a->lock);
873 return sprintf(buf, "%llu\n",
874 (unsigned long long)a->energy[attr->index] * 1000);
877 /* Display power interval registers */
878 static ssize_t aem_show_power_period(struct device *dev,
879 struct device_attribute *devattr,
882 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
883 struct aem_data *a = dev_get_drvdata(dev);
886 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
889 /* Set power interval registers */
890 static ssize_t aem_set_power_period(struct device *dev,
891 struct device_attribute *devattr,
892 const char *buf, size_t count)
894 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
895 struct aem_data *a = dev_get_drvdata(dev);
899 res = strict_strtoul(buf, 10, &temp);
903 if (temp < AEM_MIN_POWER_INTERVAL)
906 mutex_lock(&a->lock);
907 a->power_period[attr->index] = temp;
908 mutex_unlock(&a->lock);
913 /* Discover sensors on an AEM device */
914 static int aem_register_sensors(struct aem_data *data,
915 struct aem_ro_sensor_template *ro,
916 struct aem_rw_sensor_template *rw)
918 struct device *dev = &data->pdev->dev;
919 struct sensor_device_attribute *sensors = data->sensors;
922 /* Set up read-only sensors */
924 sysfs_attr_init(&sensors->dev_attr.attr);
925 sensors->dev_attr.attr.name = ro->label;
926 sensors->dev_attr.attr.mode = S_IRUGO;
927 sensors->dev_attr.show = ro->show;
928 sensors->index = ro->index;
930 err = device_create_file(dev, &sensors->dev_attr);
932 sensors->dev_attr.attr.name = NULL;
939 /* Set up read-write sensors */
941 sysfs_attr_init(&sensors->dev_attr.attr);
942 sensors->dev_attr.attr.name = rw->label;
943 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
944 sensors->dev_attr.show = rw->show;
945 sensors->dev_attr.store = rw->set;
946 sensors->index = rw->index;
948 err = device_create_file(dev, &sensors->dev_attr);
950 sensors->dev_attr.attr.name = NULL;
957 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
960 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
964 aem_remove_sensors(data);
968 /* sysfs support functions for AEM2 sensors */
970 /* Display temperature use */
971 static ssize_t aem2_show_temp(struct device *dev,
972 struct device_attribute *devattr,
975 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
976 struct aem_data *a = dev_get_drvdata(dev);
979 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
982 /* Display power-capping registers */
983 static ssize_t aem2_show_pcap_value(struct device *dev,
984 struct device_attribute *devattr,
987 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
988 struct aem_data *a = dev_get_drvdata(dev);
991 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
994 /* Remove sensors attached to an AEM device */
995 static void aem_remove_sensors(struct aem_data *data)
999 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1000 if (!data->sensors[i].dev_attr.attr.name)
1002 device_remove_file(&data->pdev->dev,
1003 &data->sensors[i].dev_attr);
1006 device_remove_file(&data->pdev->dev,
1007 &sensor_dev_attr_name.dev_attr);
1008 device_remove_file(&data->pdev->dev,
1009 &sensor_dev_attr_version.dev_attr);
1012 /* Sensor probe functions */
1014 /* Description of AEM1 sensors */
1015 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1016 {"energy1_input", aem_show_energy, 0},
1017 {"power1_average", aem_show_power, 0},
1021 static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1022 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1023 {NULL, NULL, NULL, 0},
1026 /* Description of AEM2 sensors */
1027 static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1028 {"energy1_input", aem_show_energy, 0},
1029 {"energy2_input", aem_show_energy, 1},
1030 {"power1_average", aem_show_power, 0},
1031 {"power2_average", aem_show_power, 1},
1032 {"temp1_input", aem2_show_temp, 0},
1033 {"temp2_input", aem2_show_temp, 1},
1035 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1036 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1037 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1038 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1040 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1041 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1045 static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1046 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1047 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1048 {NULL, NULL, NULL, 0},
1051 /* Set up AEM1 sensor attrs */
1052 static int aem1_find_sensors(struct aem_data *data)
1054 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1057 /* Set up AEM2 sensor attrs */
1058 static int aem2_find_sensors(struct aem_data *data)
1060 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1063 /* Module init/exit routines */
1065 static int __init aem_init(void)
1069 res = driver_register(&aem_driver.driver);
1071 pr_err("Can't register aem driver\n");
1075 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1081 driver_unregister(&aem_driver.driver);
1086 static void __exit aem_exit(void)
1088 struct aem_data *p1, *next1;
1090 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1091 driver_unregister(&aem_driver.driver);
1092 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1096 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1097 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1098 MODULE_LICENSE("GPL");
1100 module_init(aem_init);
1101 module_exit(aem_exit);
1103 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1104 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1105 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1106 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1107 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1108 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1109 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");