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 to update sensors */
152 void (*update)(struct aem_data *data);
163 * Two temperature sensors
164 * Six power cap registers
168 struct sensor_device_attribute sensors[AEM_NUM_SENSORS];
170 /* energy use in mJ */
171 u64 energy[AEM_NUM_ENERGY_REGS];
173 /* power sampling interval in ms */
174 unsigned long power_period[AEM_NUM_ENERGY_REGS];
176 /* Everything past here is for AEM2 only */
178 /* power caps in dW */
179 u16 pcap[AEM2_NUM_PCAP_REGS];
181 /* exhaust temperature in C */
182 u8 temp[AEM2_NUM_TEMP_REGS];
185 /* Data structures returned by the AEM firmware */
189 static struct aem_iana_id system_x_id = {
190 .bytes = {0x4D, 0x4F, 0x00}
193 /* These are used to find AEM1 instances */
194 struct aem_find_firmware_req {
195 struct aem_iana_id id;
198 __be16 module_type_id;
201 struct aem_find_firmware_resp {
202 struct aem_iana_id id;
206 /* These are used to find AEM2 instances */
207 struct aem_find_instance_req {
208 struct aem_iana_id id;
210 __be16 module_type_id;
213 struct aem_find_instance_resp {
214 struct aem_iana_id id;
222 /* These are used to query sensors */
223 struct aem_read_sensor_req {
224 struct aem_iana_id id;
232 struct aem_read_sensor_resp {
233 struct aem_iana_id id;
237 /* Data structures to talk to the IPMI layer */
238 struct aem_driver_data {
239 struct list_head aem_devices;
240 struct ipmi_smi_watcher bmc_events;
241 struct ipmi_user_hndl ipmi_hndlrs;
244 static void aem_register_bmc(int iface, struct device *dev);
245 static void aem_bmc_gone(int iface);
246 static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
248 static void aem_remove_sensors(struct aem_data *data);
249 static int aem_init_aem1(struct aem_ipmi_data *probe);
250 static int aem_init_aem2(struct aem_ipmi_data *probe);
251 static int aem1_find_sensors(struct aem_data *data);
252 static int aem2_find_sensors(struct aem_data *data);
253 static void update_aem1_sensors(struct aem_data *data);
254 static void update_aem2_sensors(struct aem_data *data);
256 static struct aem_driver_data driver_data = {
257 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices),
259 .owner = THIS_MODULE,
260 .new_smi = aem_register_bmc,
261 .smi_gone = aem_bmc_gone,
264 .ipmi_recv_hndl = aem_msg_handler,
268 /* Functions to talk to the IPMI layer */
270 /* Initialize IPMI address, message buffers and user data */
271 static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface,
276 init_completion(&data->read_complete);
277 data->bmc_device = bmc;
279 /* Initialize IPMI address */
280 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
281 data->address.channel = IPMI_BMC_CHANNEL;
282 data->address.data[0] = 0;
283 data->interface = iface;
285 /* Initialize message buffers */
287 data->tx_message.netfn = AEM_NETFN;
289 /* Create IPMI messaging interface user */
290 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
293 dev_err(bmc, "Unable to register user with IPMI "
294 "interface %d\n", data->interface);
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, "Mismatch between received msgid "
333 "(%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);
362 static int aem_idr_get(int *id)
367 if (unlikely(!idr_pre_get(&aem_idr, GFP_KERNEL)))
370 spin_lock(&aem_idr_lock);
371 err = idr_get_new(&aem_idr, NULL, &i);
372 spin_unlock(&aem_idr_lock);
374 if (unlikely(err == -EAGAIN))
376 else if (unlikely(err))
379 *id = i & MAX_ID_MASK;
383 /* Release an object ID */
384 static void aem_idr_put(int id)
386 spin_lock(&aem_idr_lock);
387 idr_remove(&aem_idr, id);
388 spin_unlock(&aem_idr_lock);
391 /* Sensor support functions */
393 /* Read a sensor value */
394 static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg,
395 void *buf, size_t size)
398 struct aem_read_sensor_req rs_req;
399 struct aem_read_sensor_resp *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 rs_resp = kzalloc(rs_size, GFP_KERNEL);
429 ipmi->rx_msg_data = rs_resp;
430 ipmi->rx_msg_len = rs_size;
432 aem_send_message(ipmi);
434 res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT);
438 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size ||
439 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) {
447 *x = rs_resp->bytes[0];
452 *x = be16_to_cpup((__be16 *)rs_resp->bytes);
457 *x = be32_to_cpup((__be32 *)rs_resp->bytes);
462 *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 hwmon_device_unregister(data->hwmon_dev);
525 ipmi_destroy_user(data->ipmi.user);
526 dev_set_drvdata(&data->pdev->dev, NULL);
527 platform_device_unregister(data->pdev);
528 aem_idr_put(data->id);
532 /* Probe functions for AEM1 devices */
534 /* Retrieve version and module handle for an AEM1 instance */
535 static int aem_find_aem1_count(struct aem_ipmi_data *data)
538 struct aem_find_firmware_req ff_req;
539 struct aem_find_firmware_resp ff_resp;
541 ff_req.id = system_x_id;
543 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
545 data->tx_message.cmd = AEM_FIND_FW_CMD;
546 data->tx_message.data = (char *)&ff_req;
547 data->tx_message.data_len = sizeof(ff_req);
549 data->rx_msg_data = &ff_resp;
550 data->rx_msg_len = sizeof(ff_resp);
552 aem_send_message(data);
554 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
558 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) ||
559 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id)))
562 return ff_resp.num_instances;
565 /* Find and initialize one AEM1 instance */
566 static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
568 struct aem_data *data;
572 data = kzalloc(sizeof(*data), GFP_KERNEL);
575 mutex_init(&data->lock);
577 /* Copy instance data */
580 data->module_handle = module_handle;
581 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++)
582 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
584 /* Create sub-device for this fw instance */
585 if (aem_idr_get(&data->id))
588 data->pdev = platform_device_alloc(DRVNAME, data->id);
591 data->pdev->dev.driver = &aem_driver.driver;
593 res = platform_device_add(data->pdev);
597 dev_set_drvdata(&data->pdev->dev, data);
599 /* Set up IPMI interface */
600 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
604 /* Register with hwmon */
605 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
607 if (IS_ERR(data->hwmon_dev)) {
608 dev_err(&data->pdev->dev, "Unable to register hwmon "
609 "device for IPMI interface %d\n",
614 data->update = update_aem1_sensors;
617 if (aem1_find_sensors(data))
620 /* Add to our list of AEM devices */
621 list_add_tail(&data->list, &driver_data.aem_devices);
623 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
624 data->ver_major, data->ver_minor,
625 data->module_handle);
629 hwmon_device_unregister(data->hwmon_dev);
631 ipmi_destroy_user(data->ipmi.user);
633 dev_set_drvdata(&data->pdev->dev, NULL);
634 platform_device_unregister(data->pdev);
636 aem_idr_put(data->id);
643 /* Find and initialize all AEM1 instances */
644 static int aem_init_aem1(struct aem_ipmi_data *probe)
648 num = aem_find_aem1_count(probe);
649 for (i = 0; i < num; i++) {
650 err = aem_init_aem1_inst(probe, i);
652 dev_err(probe->bmc_device,
653 "Error %d initializing AEM1 0x%X\n",
662 /* Probe functions for AEM2 devices */
664 /* Retrieve version and module handle for an AEM2 instance */
665 static int aem_find_aem2(struct aem_ipmi_data *data,
666 struct aem_find_instance_resp *fi_resp,
670 struct aem_find_instance_req fi_req;
672 fi_req.id = system_x_id;
673 fi_req.instance_number = instance_num;
674 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID);
676 data->tx_message.cmd = AEM_FW_INSTANCE_CMD;
677 data->tx_message.data = (char *)&fi_req;
678 data->tx_message.data_len = sizeof(fi_req);
680 data->rx_msg_data = fi_resp;
681 data->rx_msg_len = sizeof(*fi_resp);
683 aem_send_message(data);
685 res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT);
689 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) ||
690 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) ||
691 fi_resp->num_instances <= instance_num)
697 /* Find and initialize one AEM2 instance */
698 static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
699 struct aem_find_instance_resp *fi_resp)
701 struct aem_data *data;
705 data = kzalloc(sizeof(*data), GFP_KERNEL);
708 mutex_init(&data->lock);
710 /* Copy instance data */
711 data->ver_major = fi_resp->major;
712 data->ver_minor = fi_resp->minor;
713 data->module_handle = fi_resp->module_handle;
714 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++)
715 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL;
717 /* Create sub-device for this fw instance */
718 if (aem_idr_get(&data->id))
721 data->pdev = platform_device_alloc(DRVNAME, data->id);
724 data->pdev->dev.driver = &aem_driver.driver;
726 res = platform_device_add(data->pdev);
730 dev_set_drvdata(&data->pdev->dev, data);
732 /* Set up IPMI interface */
733 if (aem_init_ipmi_data(&data->ipmi, probe->interface,
737 /* Register with hwmon */
738 data->hwmon_dev = hwmon_device_register(&data->pdev->dev);
740 if (IS_ERR(data->hwmon_dev)) {
741 dev_err(&data->pdev->dev, "Unable to register hwmon "
742 "device for IPMI interface %d\n",
747 data->update = update_aem2_sensors;
750 if (aem2_find_sensors(data))
753 /* Add to our list of AEM devices */
754 list_add_tail(&data->list, &driver_data.aem_devices);
756 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n",
757 data->ver_major, data->ver_minor,
758 data->module_handle);
762 hwmon_device_unregister(data->hwmon_dev);
764 ipmi_destroy_user(data->ipmi.user);
766 dev_set_drvdata(&data->pdev->dev, NULL);
767 platform_device_unregister(data->pdev);
769 aem_idr_put(data->id);
776 /* Find and initialize all AEM2 instances */
777 static int aem_init_aem2(struct aem_ipmi_data *probe)
779 struct aem_find_instance_resp fi_resp;
783 while (!aem_find_aem2(probe, &fi_resp, i)) {
784 if (fi_resp.major != 2) {
785 dev_err(probe->bmc_device, "Unknown AEM v%d; please "
786 "report this to the maintainer.\n",
791 err = aem_init_aem2_inst(probe, &fi_resp);
793 dev_err(probe->bmc_device,
794 "Error %d initializing AEM2 0x%X\n",
795 err, fi_resp.module_handle);
804 /* Probe a BMC for AEM firmware instances */
805 static void aem_register_bmc(int iface, struct device *dev)
807 struct aem_ipmi_data probe;
809 if (aem_init_ipmi_data(&probe, iface, dev))
812 /* Ignore probe errors; they won't cause problems */
813 aem_init_aem1(&probe);
814 aem_init_aem2(&probe);
816 ipmi_destroy_user(probe.user);
819 /* Handle BMC deletion */
820 static void aem_bmc_gone(int iface)
822 struct aem_data *p1, *next1;
824 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
825 if (p1->ipmi.interface == iface)
829 /* sysfs support functions */
831 /* AEM device name */
832 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
835 struct aem_data *data = dev_get_drvdata(dev);
837 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major);
839 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
841 /* AEM device version */
842 static ssize_t show_version(struct device *dev,
843 struct device_attribute *devattr,
846 struct aem_data *data = dev_get_drvdata(dev);
848 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor);
850 static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0);
852 /* Display power use */
853 static ssize_t aem_show_power(struct device *dev,
854 struct device_attribute *devattr,
857 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
858 struct aem_data *data = dev_get_drvdata(dev);
859 u64 before, after, delta, time;
860 signed long leftover;
861 struct timespec b, a;
863 mutex_lock(&data->lock);
864 update_aem_energy_one(data, attr->index);
866 before = data->energy[attr->index];
868 leftover = schedule_timeout_interruptible(
869 msecs_to_jiffies(data->power_period[attr->index])
872 mutex_unlock(&data->lock);
876 update_aem_energy_one(data, attr->index);
878 after = data->energy[attr->index];
879 mutex_unlock(&data->lock);
881 time = timespec_to_ns(&a) - timespec_to_ns(&b);
882 delta = (after - before) * UJ_PER_MJ;
884 return sprintf(buf, "%llu\n",
885 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time));
888 /* Display energy use */
889 static ssize_t aem_show_energy(struct device *dev,
890 struct device_attribute *devattr,
893 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
894 struct aem_data *a = dev_get_drvdata(dev);
895 mutex_lock(&a->lock);
896 update_aem_energy_one(a, attr->index);
897 mutex_unlock(&a->lock);
899 return sprintf(buf, "%llu\n",
900 (unsigned long long)a->energy[attr->index] * 1000);
903 /* Display power interval registers */
904 static ssize_t aem_show_power_period(struct device *dev,
905 struct device_attribute *devattr,
908 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
909 struct aem_data *a = dev_get_drvdata(dev);
912 return sprintf(buf, "%lu\n", a->power_period[attr->index]);
915 /* Set power interval registers */
916 static ssize_t aem_set_power_period(struct device *dev,
917 struct device_attribute *devattr,
918 const char *buf, size_t count)
920 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
921 struct aem_data *a = dev_get_drvdata(dev);
925 res = strict_strtoul(buf, 10, &temp);
929 if (temp < AEM_MIN_POWER_INTERVAL)
932 mutex_lock(&a->lock);
933 a->power_period[attr->index] = temp;
934 mutex_unlock(&a->lock);
939 /* Discover sensors on an AEM device */
940 static int aem_register_sensors(struct aem_data *data,
941 struct aem_ro_sensor_template *ro,
942 struct aem_rw_sensor_template *rw)
944 struct device *dev = &data->pdev->dev;
945 struct sensor_device_attribute *sensors = data->sensors;
948 /* Set up read-only sensors */
950 sensors->dev_attr.attr.name = ro->label;
951 sensors->dev_attr.attr.mode = S_IRUGO;
952 sensors->dev_attr.show = ro->show;
953 sensors->index = ro->index;
955 err = device_create_file(dev, &sensors->dev_attr);
957 sensors->dev_attr.attr.name = NULL;
964 /* Set up read-write sensors */
966 sensors->dev_attr.attr.name = rw->label;
967 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
968 sensors->dev_attr.show = rw->show;
969 sensors->dev_attr.store = rw->set;
970 sensors->index = rw->index;
972 err = device_create_file(dev, &sensors->dev_attr);
974 sensors->dev_attr.attr.name = NULL;
981 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr);
984 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr);
988 aem_remove_sensors(data);
992 /* sysfs support functions for AEM2 sensors */
994 /* Display temperature use */
995 static ssize_t aem2_show_temp(struct device *dev,
996 struct device_attribute *devattr,
999 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1000 struct aem_data *a = dev_get_drvdata(dev);
1003 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000);
1006 /* Display power-capping registers */
1007 static ssize_t aem2_show_pcap_value(struct device *dev,
1008 struct device_attribute *devattr,
1011 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1012 struct aem_data *a = dev_get_drvdata(dev);
1015 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000);
1018 /* Remove sensors attached to an AEM device */
1019 static void aem_remove_sensors(struct aem_data *data)
1023 for (i = 0; i < AEM_NUM_SENSORS; i++) {
1024 if (!data->sensors[i].dev_attr.attr.name)
1026 device_remove_file(&data->pdev->dev,
1027 &data->sensors[i].dev_attr);
1030 device_remove_file(&data->pdev->dev,
1031 &sensor_dev_attr_name.dev_attr);
1032 device_remove_file(&data->pdev->dev,
1033 &sensor_dev_attr_version.dev_attr);
1036 /* Sensor probe functions */
1038 /* Description of AEM1 sensors */
1039 static struct aem_ro_sensor_template aem1_ro_sensors[] = {
1040 {"energy1_input", aem_show_energy, 0},
1041 {"power1_average", aem_show_power, 0},
1045 static struct aem_rw_sensor_template aem1_rw_sensors[] = {
1046 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1047 {NULL, NULL, NULL, 0},
1050 /* Description of AEM2 sensors */
1051 static struct aem_ro_sensor_template aem2_ro_sensors[] = {
1052 {"energy1_input", aem_show_energy, 0},
1053 {"energy2_input", aem_show_energy, 1},
1054 {"power1_average", aem_show_power, 0},
1055 {"power2_average", aem_show_power, 1},
1056 {"temp1_input", aem2_show_temp, 0},
1057 {"temp2_input", aem2_show_temp, 1},
1059 {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG},
1060 {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX},
1061 {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING},
1062 {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN},
1064 {"power3_average", aem2_show_pcap_value, POWER_AUX},
1065 {"power_cap", aem2_show_pcap_value, POWER_CAP},
1069 static struct aem_rw_sensor_template aem2_rw_sensors[] = {
1070 {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0},
1071 {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1},
1072 {NULL, NULL, NULL, 0},
1075 /* Set up AEM1 sensor attrs */
1076 static int aem1_find_sensors(struct aem_data *data)
1078 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors);
1081 /* Set up AEM2 sensor attrs */
1082 static int aem2_find_sensors(struct aem_data *data)
1084 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors);
1087 /* Module init/exit routines */
1089 static int __init aem_init(void)
1093 res = driver_register(&aem_driver.driver);
1095 pr_err("Can't register aem driver\n");
1099 res = ipmi_smi_watcher_register(&driver_data.bmc_events);
1105 driver_unregister(&aem_driver.driver);
1110 static void __exit aem_exit(void)
1112 struct aem_data *p1, *next1;
1114 ipmi_smi_watcher_unregister(&driver_data.bmc_events);
1115 driver_unregister(&aem_driver.driver);
1116 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
1120 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1121 MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver");
1122 MODULE_LICENSE("GPL");
1124 module_init(aem_init);
1125 module_exit(aem_exit);
1127 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*");
1128 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*");
1129 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*");
1130 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*");
1131 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");
1132 MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*");
1133 MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");