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![Rasmus Villemoes](/assets/img/avatar_default.png)
The only difference between the three power_sensor_name_templates is whether there is a suffix of "", "_lowest" or "_highest". We might as well pull those into an array and use a literal format string, allowing gcc to do type checking of the arguments to sprintf. Incidentially, the same three suffixes are used in the temp_sensor_name_templates case, so we end up eliminating one static array. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> [Guenter Roeck: Fixed line length over 80 characters] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
615 lines
15 KiB
C
615 lines
15 KiB
C
/*
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* A hwmon driver for the IBM PowerExecutive temperature/power sensors
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* Copyright (C) 2007 IBM
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/ipmi.h>
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#include <linux/module.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/jiffies.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#define REFRESH_INTERVAL (2 * HZ)
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#define DRVNAME "ibmpex"
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#define PEX_GET_VERSION 1
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#define PEX_GET_SENSOR_COUNT 2
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#define PEX_GET_SENSOR_NAME 3
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#define PEX_RESET_HIGH_LOW 4
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#define PEX_GET_SENSOR_DATA 6
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#define PEX_NET_FUNCTION 0x3A
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#define PEX_COMMAND 0x3C
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static inline u16 extract_value(const char *data, int offset)
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{
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return be16_to_cpup((__be16 *)&data[offset]);
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}
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#define TEMP_SENSOR 1
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#define POWER_SENSOR 2
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#define PEX_SENSOR_TYPE_LEN 3
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static u8 const power_sensor_sig[] = {0x70, 0x77, 0x72};
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static u8 const temp_sensor_sig[] = {0x74, 0x65, 0x6D};
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#define PEX_MULT_LEN 2
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static u8 const watt_sensor_sig[] = {0x41, 0x43};
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#define PEX_NUM_SENSOR_FUNCS 3
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static const char * const sensor_name_suffixes[] = {
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"",
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"_lowest",
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"_highest"
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};
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static void ibmpex_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data);
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static void ibmpex_register_bmc(int iface, struct device *dev);
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static void ibmpex_bmc_gone(int iface);
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struct ibmpex_sensor_data {
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int in_use;
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s16 values[PEX_NUM_SENSOR_FUNCS];
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int multiplier;
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struct sensor_device_attribute_2 attr[PEX_NUM_SENSOR_FUNCS];
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};
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struct ibmpex_bmc_data {
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struct list_head list;
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struct device *hwmon_dev;
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struct device *bmc_device;
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struct mutex lock;
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char valid;
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unsigned long last_updated; /* In jiffies */
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struct ipmi_addr address;
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struct completion read_complete;
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ipmi_user_t user;
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int interface;
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struct kernel_ipmi_msg tx_message;
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unsigned char tx_msg_data[IPMI_MAX_MSG_LENGTH];
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long tx_msgid;
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unsigned char rx_msg_data[IPMI_MAX_MSG_LENGTH];
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unsigned long rx_msg_len;
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unsigned char rx_result;
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int rx_recv_type;
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unsigned char sensor_major;
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unsigned char sensor_minor;
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unsigned char num_sensors;
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struct ibmpex_sensor_data *sensors;
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};
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struct ibmpex_driver_data {
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struct list_head bmc_data;
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struct ipmi_smi_watcher bmc_events;
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struct ipmi_user_hndl ipmi_hndlrs;
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};
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static struct ibmpex_driver_data driver_data = {
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.bmc_data = LIST_HEAD_INIT(driver_data.bmc_data),
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.bmc_events = {
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.owner = THIS_MODULE,
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.new_smi = ibmpex_register_bmc,
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.smi_gone = ibmpex_bmc_gone,
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},
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.ipmi_hndlrs = {
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.ipmi_recv_hndl = ibmpex_msg_handler,
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},
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};
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static int ibmpex_send_message(struct ibmpex_bmc_data *data)
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{
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int err;
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err = ipmi_validate_addr(&data->address, sizeof(data->address));
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if (err)
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goto out;
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data->tx_msgid++;
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err = ipmi_request_settime(data->user, &data->address, data->tx_msgid,
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&data->tx_message, data, 0, 0, 0);
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if (err)
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goto out1;
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return 0;
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out1:
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dev_err(data->bmc_device, "request_settime=%x\n", err);
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return err;
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out:
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dev_err(data->bmc_device, "validate_addr=%x\n", err);
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return err;
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}
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static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
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{
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data->tx_msg_data[0] = PEX_GET_VERSION;
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data->tx_message.data_len = 1;
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ibmpex_send_message(data);
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wait_for_completion(&data->read_complete);
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if (data->rx_result || data->rx_msg_len != 6)
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return -ENOENT;
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data->sensor_major = data->rx_msg_data[0];
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data->sensor_minor = data->rx_msg_data[1];
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dev_info(data->bmc_device,
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"Found BMC with sensor interface v%d.%d %d-%02d-%02d on interface %d\n",
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data->sensor_major,
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data->sensor_minor,
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extract_value(data->rx_msg_data, 2),
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data->rx_msg_data[4],
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data->rx_msg_data[5],
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data->interface);
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return 0;
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}
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static int ibmpex_query_sensor_count(struct ibmpex_bmc_data *data)
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{
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data->tx_msg_data[0] = PEX_GET_SENSOR_COUNT;
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data->tx_message.data_len = 1;
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ibmpex_send_message(data);
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wait_for_completion(&data->read_complete);
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if (data->rx_result || data->rx_msg_len != 1)
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return -ENOENT;
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return data->rx_msg_data[0];
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}
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static int ibmpex_query_sensor_name(struct ibmpex_bmc_data *data, int sensor)
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{
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data->tx_msg_data[0] = PEX_GET_SENSOR_NAME;
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data->tx_msg_data[1] = sensor;
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data->tx_message.data_len = 2;
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ibmpex_send_message(data);
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wait_for_completion(&data->read_complete);
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if (data->rx_result || data->rx_msg_len < 1)
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return -ENOENT;
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return 0;
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}
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static int ibmpex_query_sensor_data(struct ibmpex_bmc_data *data, int sensor)
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{
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data->tx_msg_data[0] = PEX_GET_SENSOR_DATA;
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data->tx_msg_data[1] = sensor;
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data->tx_message.data_len = 2;
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ibmpex_send_message(data);
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wait_for_completion(&data->read_complete);
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if (data->rx_result || data->rx_msg_len < 26) {
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dev_err(data->bmc_device, "Error reading sensor %d.\n",
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sensor);
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return -ENOENT;
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}
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return 0;
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}
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static int ibmpex_reset_high_low_data(struct ibmpex_bmc_data *data)
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{
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data->tx_msg_data[0] = PEX_RESET_HIGH_LOW;
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data->tx_message.data_len = 1;
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ibmpex_send_message(data);
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wait_for_completion(&data->read_complete);
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return 0;
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}
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static void ibmpex_update_device(struct ibmpex_bmc_data *data)
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{
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int i, err;
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mutex_lock(&data->lock);
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if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) &&
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data->valid)
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goto out;
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for (i = 0; i < data->num_sensors; i++) {
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if (!data->sensors[i].in_use)
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continue;
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err = ibmpex_query_sensor_data(data, i);
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if (err)
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continue;
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data->sensors[i].values[0] =
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extract_value(data->rx_msg_data, 16);
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data->sensors[i].values[1] =
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extract_value(data->rx_msg_data, 18);
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data->sensors[i].values[2] =
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extract_value(data->rx_msg_data, 20);
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}
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data->last_updated = jiffies;
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data->valid = 1;
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out:
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mutex_unlock(&data->lock);
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}
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static struct ibmpex_bmc_data *get_bmc_data(int iface)
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{
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struct ibmpex_bmc_data *p, *next;
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list_for_each_entry_safe(p, next, &driver_data.bmc_data, list)
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if (p->interface == iface)
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return p;
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return NULL;
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}
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static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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return sprintf(buf, "%s\n", DRVNAME);
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}
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
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static ssize_t ibmpex_show_sensor(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
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struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
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int mult = data->sensors[attr->index].multiplier;
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ibmpex_update_device(data);
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return sprintf(buf, "%d\n",
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data->sensors[attr->index].values[attr->nr] * mult);
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}
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static ssize_t ibmpex_reset_high_low(struct device *dev,
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struct device_attribute *devattr,
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const char *buf,
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size_t count)
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{
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struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
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ibmpex_reset_high_low_data(data);
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return count;
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}
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static SENSOR_DEVICE_ATTR(reset_high_low, S_IWUSR, NULL,
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ibmpex_reset_high_low, 0);
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static int is_power_sensor(const char *sensor_id, int len)
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{
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if (len < PEX_SENSOR_TYPE_LEN)
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return 0;
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if (!memcmp(sensor_id, power_sensor_sig, PEX_SENSOR_TYPE_LEN))
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return 1;
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return 0;
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}
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static int is_temp_sensor(const char *sensor_id, int len)
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{
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if (len < PEX_SENSOR_TYPE_LEN)
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return 0;
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if (!memcmp(sensor_id, temp_sensor_sig, PEX_SENSOR_TYPE_LEN))
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return 1;
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return 0;
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}
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static int power_sensor_multiplier(struct ibmpex_bmc_data *data,
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const char *sensor_id, int len)
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{
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int i;
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if (data->sensor_major == 2)
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return 1000000;
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for (i = PEX_SENSOR_TYPE_LEN; i < len - 1; i++)
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if (!memcmp(&sensor_id[i], watt_sensor_sig, PEX_MULT_LEN))
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return 1000000;
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return 100000;
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}
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static int create_sensor(struct ibmpex_bmc_data *data, int type,
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int counter, int sensor, int func)
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{
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int err;
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char *n;
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n = kmalloc(32, GFP_KERNEL);
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if (!n)
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return -ENOMEM;
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if (type == TEMP_SENSOR)
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sprintf(n, "temp%d_input%s",
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counter, sensor_name_suffixes[func]);
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else if (type == POWER_SENSOR)
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sprintf(n, "power%d_average%s",
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counter, sensor_name_suffixes[func]);
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sysfs_attr_init(&data->sensors[sensor].attr[func].dev_attr.attr);
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data->sensors[sensor].attr[func].dev_attr.attr.name = n;
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data->sensors[sensor].attr[func].dev_attr.attr.mode = S_IRUGO;
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data->sensors[sensor].attr[func].dev_attr.show = ibmpex_show_sensor;
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data->sensors[sensor].attr[func].index = sensor;
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data->sensors[sensor].attr[func].nr = func;
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err = device_create_file(data->bmc_device,
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&data->sensors[sensor].attr[func].dev_attr);
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if (err) {
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data->sensors[sensor].attr[func].dev_attr.attr.name = NULL;
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kfree(n);
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return err;
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}
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return 0;
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}
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static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
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{
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int i, j, err;
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int sensor_type;
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int sensor_counter;
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int num_power = 0;
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int num_temp = 0;
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err = ibmpex_query_sensor_count(data);
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if (err <= 0)
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return -ENOENT;
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data->num_sensors = err;
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data->sensors = kzalloc(data->num_sensors * sizeof(*data->sensors),
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GFP_KERNEL);
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if (!data->sensors)
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return -ENOMEM;
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for (i = 0; i < data->num_sensors; i++) {
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err = ibmpex_query_sensor_name(data, i);
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if (err)
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continue;
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if (is_power_sensor(data->rx_msg_data, data->rx_msg_len)) {
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sensor_type = POWER_SENSOR;
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num_power++;
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sensor_counter = num_power;
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data->sensors[i].multiplier =
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power_sensor_multiplier(data,
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data->rx_msg_data,
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data->rx_msg_len);
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} else if (is_temp_sensor(data->rx_msg_data,
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data->rx_msg_len)) {
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sensor_type = TEMP_SENSOR;
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num_temp++;
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sensor_counter = num_temp;
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data->sensors[i].multiplier = 1000;
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} else
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continue;
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data->sensors[i].in_use = 1;
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/* Create attributes */
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for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
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err = create_sensor(data, sensor_type, sensor_counter,
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i, j);
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if (err)
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goto exit_remove;
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}
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}
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err = device_create_file(data->bmc_device,
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&sensor_dev_attr_reset_high_low.dev_attr);
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if (err)
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goto exit_remove;
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err = device_create_file(data->bmc_device,
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&sensor_dev_attr_name.dev_attr);
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if (err)
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goto exit_remove;
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return 0;
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exit_remove:
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device_remove_file(data->bmc_device,
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&sensor_dev_attr_reset_high_low.dev_attr);
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device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
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for (i = 0; i < data->num_sensors; i++)
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for (j = 0; j < PEX_NUM_SENSOR_FUNCS; j++) {
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if (!data->sensors[i].attr[j].dev_attr.attr.name)
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continue;
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device_remove_file(data->bmc_device,
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&data->sensors[i].attr[j].dev_attr);
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kfree(data->sensors[i].attr[j].dev_attr.attr.name);
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}
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kfree(data->sensors);
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return err;
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}
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static void ibmpex_register_bmc(int iface, struct device *dev)
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{
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struct ibmpex_bmc_data *data;
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int err;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return;
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data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
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data->address.channel = IPMI_BMC_CHANNEL;
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data->address.data[0] = 0;
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data->interface = iface;
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data->bmc_device = dev;
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/* Create IPMI messaging interface user */
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err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
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data, &data->user);
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if (err < 0) {
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dev_err(dev,
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"Unable to register user with IPMI interface %d\n",
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data->interface);
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goto out;
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}
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mutex_init(&data->lock);
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/* Initialize message */
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data->tx_msgid = 0;
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init_completion(&data->read_complete);
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data->tx_message.netfn = PEX_NET_FUNCTION;
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data->tx_message.cmd = PEX_COMMAND;
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data->tx_message.data = data->tx_msg_data;
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/* Does this BMC support PowerExecutive? */
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err = ibmpex_ver_check(data);
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if (err)
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goto out_user;
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/* Register the BMC as a HWMON class device */
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data->hwmon_dev = hwmon_device_register(data->bmc_device);
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if (IS_ERR(data->hwmon_dev)) {
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dev_err(data->bmc_device,
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"Unable to register hwmon device for IPMI interface %d\n",
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data->interface);
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goto out_user;
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}
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/* 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 <darrick.wong@oracle.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-*");
|