/* * A hwmon driver for the IBM PowerExecutive temperature/power sensors * Copyright (C) 2007 IBM * * Author: Darrick J. Wong <djwong@us.ibm.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/ipmi.h> #include <linux/module.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/jiffies.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/err.h> #define REFRESH_INTERVAL (2 * HZ) #define DRVNAME "ibmpex" #define PEX_GET_VERSION 1 #define PEX_GET_SENSOR_COUNT 2 #define PEX_GET_SENSOR_NAME 3 #define PEX_RESET_HIGH_LOW 4 #define PEX_GET_SENSOR_DATA 6 #define PEX_NET_FUNCTION 0x3A #define PEX_COMMAND 0x3C static inline u16 extract_value(const char *data, int offset) { return be16_to_cpup((__be16 *)&data[offset]); } #define TEMP_SENSOR 1 #define POWER_SENSOR 2 #define PEX_SENSOR_TYPE_LEN 3 static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72}; static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D}; #define PEX_MULT_LEN 2 static u8 const watt_sensor_sig[] = {0x41, 0x43}; #define PEX_NUM_SENSOR_FUNCS 3 static char const * const power_sensor_name_templates[] = { "%s%d_average", "%s%d_average_lowest", "%s%d_average_highest" }; static char const * const temp_sensor_name_templates[] = { "%s%d_input", "%s%d_input_lowest", "%s%d_input_highest" }; static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); static void ibmpex_register_bmc(int iface, struct device *dev); static void ibmpex_bmc_gone(int iface); struct ibmpex_sensor_data { int in_use; s16 values[PEX_NUM_SENSOR_FUNCS]; int multiplier; struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS]; }; struct ibmpex_bmc_data { struct list_head list; struct device *hwmon_dev; struct device *bmc_device; struct mutex lock; char valid; unsigned long last_updated; /* In jiffies */ struct ipmi_addr address; struct completion read_complete; ipmi_user_t user; int interface; struct kernel_ipmi_msg tx_message; unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH]; long tx_msgid; unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH]; unsigned long rx_msg_len; unsigned char rx_result; int rx_recv_type; unsigned char sensor_major; unsigned char sensor_minor; unsigned char num_sensors; struct ibmpex_sensor_data *sensors; }; struct ibmpex_driver_data { struct list_head bmc_data; struct ipmi_smi_watcher bmc_events; struct ipmi_user_hndl ipmi_hndlrs; }; static struct ibmpex_driver_data driver_data = { .bmc_data = LIST_HEAD_INIT(driver_data.bmc_data), .bmc_events = { .owner = THIS_MODULE, .new_smi = ibmpex_register_bmc, .smi_gone = ibmpex_bmc_gone, }, .ipmi_hndlrs = { .ipmi_recv_hndl = ibmpex_msg_handler, }, }; static int ibmpex_send_message(struct ibmpex_bmc_data *data) { int err; err = ipmi_validate_addr(&data->address, sizeof(data->address)); if (err) goto out; data->tx_msgid++; err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, &data->tx_message, data, 0, 0, 0); if (err) goto out1; return 0; out1: dev_err(data->bmc_device, "request_settime=%x\n", err); return err; out: dev_err(data->bmc_device, "validate_addr=%x\n", err); return err; } static int ibmpex_ver_check(struct ibmpex_bmc_data *data) { data->tx_msg_data[0] = PEX_GET_VERSION; data->tx_message.data_len = 1; ibmpex_send_message(data); wait_for_completion(&data->read_complete); if (data->rx_result || data->rx_msg_len != 6) return -ENOENT; data->sensor_major = data->rx_msg_data[0]; data->sensor_minor = data->rx_msg_data[1]; dev_info(data->bmc_device, "Found BMC with sensor interface " "v%d.%d %d-%02d-%02d on interface %d\n", data->sensor_major, data->sensor_minor, extract_value(data->rx_msg_data, 2), data->rx_msg_data[4], data->rx_msg_data[5], data->interface); return 0; } static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data) { data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT; data->tx_message.data_len = 1; ibmpex_send_message(data); wait_for_completion(&data->read_complete); if (data->rx_result || data->rx_msg_len != 1) return -ENOENT; return data->rx_msg_data[0]; } static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor) { data->tx_msg_data[0] = PEX_GET_SENSOR_NAME; data->tx_msg_data[1] = sensor; data->tx_message.data_len = 2; ibmpex_send_message(data); wait_for_completion(&data->read_complete); if (data->rx_result || data->rx_msg_len < 1) return -ENOENT; return 0; } static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor) { data->tx_msg_data[0] = PEX_GET_SENSOR_DATA; data->tx_msg_data[1] = sensor; data->tx_message.data_len = 2; ibmpex_send_message(data); wait_for_completion(&data->read_complete); if (data->rx_result || data->rx_msg_len < 26) { dev_err(data->bmc_device, "Error reading sensor %d.\n", sensor); return -ENOENT; } return 0; } static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data) { data->tx_msg_data[0] = PEX_RESET_HIGH_LOW; data->tx_message.data_len = 1; ibmpex_send_message(data); wait_for_completion(&data->read_complete); return 0; } static void ibmpex_update_device(struct ibmpex_bmc_data *data) { int i, err; mutex_lock(&data->lock); if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && data->valid) goto out; for (i = 0; i < data->num_sensors; i++) { if (!data->sensors[i].in_use) continue; err = ibmpex_query_sensor_data(data, i); if (err) continue; data->sensors[i].values[0] = extract_value(data->rx_msg_data, 16); data->sensors[i].values[1] = extract_value(data->rx_msg_data, 18); data->sensors[i].values[2] = extract_value(data->rx_msg_data, 20); } data->last_updated = jiffies; data->valid = 1; out: mutex_unlock(&data->lock); } static struct ibmpex_bmc_data *get_bmc_data(int iface) { struct ibmpex_bmc_data *p, *next; list_for_each_entry_safe(p, next, &driver_data.bmc_data, list) if (p->interface == iface) return p; return NULL; } static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { return sprintf(buf, "%s\n", DRVNAME); } static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); static ssize_t ibmpex_show_sensor(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); struct ibmpex_bmc_data *data = dev_get_drvdata(dev); int mult = data->sensors[attr->index].multiplier; ibmpex_update_device(data); return sprintf(buf, "%d\n", data->sensors[attr->index].values[attr->nr] * mult); } static ssize_t ibmpex_reset_high_low(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct ibmpex_bmc_data *data = dev_get_drvdata(dev); ibmpex_reset_high_low_data(data); return count; } static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL, ibmpex_reset_high_low, 0); static int is_power_sensor(const char *sensor_id, int len) { if (len < PEX_SENSOR_TYPE_LEN) return 0; if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN)) return 1; return 0; } static int is_temp_sensor(const char *sensor_id, int len) { if (len < PEX_SENSOR_TYPE_LEN) return 0; if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN)) return 1; return 0; } static int power_sensor_multiplier(struct ibmpex_bmc_data *data, const char *sensor_id, int len) { int i; if (data->sensor_major == 2) return 1000000; for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++) if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN)) return 1000000; return 100000; } static int create_sensor(struct ibmpex_bmc_data *data, int type, int counter, int sensor, int func) { int err; char *n; n = kmalloc(32, GFP_KERNEL); if (!n) return -ENOMEM; if (type == TEMP_SENSOR) sprintf(n, temp_sensor_name_templates[func], "temp", counter); else if (type == POWER_SENSOR) sprintf(n, power_sensor_name_templates[func], "power", counter); sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr); data->sensors[sensor].attr[func].dev_attr.attr.name = n; data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO; data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor; data->sensors[sensor].attr[func].index = sensor; data->sensors[sensor].attr[func].nr = func; err = device_create_file(data->bmc_device, &data->sensors[sensor].attr[func].dev_attr); if (err) { data->sensors[sensor].attr[func].dev_attr.attr.name = NULL; kfree(n); return err; } return 0; } static int ibmpex_find_sensors(struct ibmpex_bmc_data *data) { int i, j, err; int sensor_type; int sensor_counter; int num_power = 0; int num_temp = 0; err = ibmpex_query_sensor_count(data); if (err <= 0) return -ENOENT; data->num_sensors = err; data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors), GFP_KERNEL); if (!data->sensors) return -ENOMEM; for (i = 0; i < data->num_sensors; i++) { err = ibmpex_query_sensor_name(data, i); if (err) continue; if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) { sensor_type = POWER_SENSOR; num_power++; sensor_counter = num_power; data->sensors[i].multiplier = power_sensor_multiplier(data, data->rx_msg_data, data->rx_msg_len); } else if (is_temp_sensor(data->rx_msg_data, data->rx_msg_len)) { sensor_type = TEMP_SENSOR; num_temp++; sensor_counter = num_temp; data->sensors[i].multiplier = 1000; } else continue; data->sensors[i].in_use = 1; /* Create attributes */ for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { err = create_sensor(data, sensor_type, sensor_counter, i, j); if (err) goto exit_remove; } } err = device_create_file(data->bmc_device, &sensor_dev_attr_reset_high_low.dev_attr); if (err) goto exit_remove; err = device_create_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); if (err) goto exit_remove; return 0; exit_remove: device_remove_file(data->bmc_device, &sensor_dev_attr_reset_high_low.dev_attr); device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); for (i = 0; i < data->num_sensors; i++) for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { if (!data->sensors[i].attr[j].dev_attr.attr.name) continue; device_remove_file(data->bmc_device, &data->sensors[i].attr[j].dev_attr); kfree(data->sensors[i].attr[j].dev_attr.attr.name); } kfree(data->sensors); return err; } static void ibmpex_register_bmc(int iface, struct device *dev) { struct ibmpex_bmc_data *data; int err; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) { dev_err(dev, "Insufficient memory for BMC interface.\n"); return; } data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; data->address.channel = IPMI_BMC_CHANNEL; data->address.data[0] = 0; data->interface = iface; data->bmc_device = dev; /* Create IPMI messaging interface user */ err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, data, &data->user); if (err < 0) { dev_err(dev, "Unable to register user with IPMI " "interface %d\n", data->interface); goto out; } mutex_init(&data->lock); /* Initialize message */ data->tx_msgid = 0; init_completion(&data->read_complete); data->tx_message.netfn = PEX_NET_FUNCTION; data->tx_message.cmd = PEX_COMMAND; data->tx_message.data = data->tx_msg_data; /* Does this BMC support PowerExecutive? */ err = ibmpex_ver_check(data); if (err) goto out_user; /* Register the BMC as a HWMON class device */ data->hwmon_dev = hwmon_device_register(data->bmc_device); if (IS_ERR(data->hwmon_dev)) { dev_err(data->bmc_device, "Unable to register hwmon " "device for IPMI interface %d\n", data->interface); goto out_user; } /* finally add the new bmc data to the bmc data list */ dev_set_drvdata(dev, data); list_add_tail(&data->list, &driver_data.bmc_data); /* Now go find all the sensors */ err = ibmpex_find_sensors(data); if (err) { dev_err(data->bmc_device, "Error %d finding sensors\n", err); goto out_register; } return; out_register: hwmon_device_unregister(data->hwmon_dev); out_user: ipmi_destroy_user(data->user); out: kfree(data); } static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data) { int i, j; device_remove_file(data->bmc_device, &sensor_dev_attr_reset_high_low.dev_attr); device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr); for (i = 0; i < data->num_sensors; i++) for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) { if (!data->sensors[i].attr[j].dev_attr.attr.name) continue; device_remove_file(data->bmc_device, &data->sensors[i].attr[j].dev_attr); kfree(data->sensors[i].attr[j].dev_attr.attr.name); } list_del(&data->list); dev_set_drvdata(data->bmc_device, NULL); hwmon_device_unregister(data->hwmon_dev); ipmi_destroy_user(data->user); kfree(data->sensors); kfree(data); } static void ibmpex_bmc_gone(int iface) { struct ibmpex_bmc_data *data = get_bmc_data(iface); if (!data) return; ibmpex_bmc_delete(data); } static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) { struct ibmpex_bmc_data *data = (struct ibmpex_bmc_data *)user_msg_data; if (msg->msgid != data->tx_msgid) { dev_err(data->bmc_device, "Mismatch between received msgid " "(%02x) and transmitted msgid (%02x)!\n", (int)msg->msgid, (int)data->tx_msgid); ipmi_free_recv_msg(msg); return; } data->rx_recv_type = msg->recv_type; if (msg->msg.data_len > 0) data->rx_result = msg->msg.data[0]; else data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; if (msg->msg.data_len > 1) { data->rx_msg_len = msg->msg.data_len - 1; memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); } else data->rx_msg_len = 0; ipmi_free_recv_msg(msg); complete(&data->read_complete); } static int __init ibmpex_init(void) { return ipmi_smi_watcher_register(&driver_data.bmc_events); } static void __exit ibmpex_exit(void) { struct ibmpex_bmc_data *p, *next; ipmi_smi_watcher_unregister(&driver_data.bmc_events); list_for_each_entry_safe(p, next, &driver_data.bmc_data, list) ibmpex_bmc_delete(p); } MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); MODULE_DESCRIPTION("IBM PowerExecutive power/temperature sensor driver"); MODULE_LICENSE("GPL"); module_init(ibmpex_init); module_exit(ibmpex_exit); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*");