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    Subject[PATCH] v2 of IBM power meter driver
    ibm_pex: Driver to export IBM PowerExecutive power meter sensor readings
    in mW.

    Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
    ---

    drivers/hwmon/Kconfig | 12 +
    drivers/hwmon/Makefile | 1
    drivers/hwmon/ibmpex.c | 600 ++++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 613 insertions(+), 0 deletions(-)

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index 555f470..41ffa2e 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -275,6 +275,18 @@ config SENSORS_CORETEMP
    sensor inside your CPU. Supported all are all known variants
    of Intel Core family.

    +config SENSORS_IBMPEX
    + tristate "IBM PowerExecutive temperature/power sensors"
    + depends on IPMI_SI
    + help
    + If you say yes here you get support for the temperature and
    + power sensors in various IBM System X servers that support
    + PowerExecutive. So far this includes the x3550, x3650, x3655,
    + x3755, and certain HS20 blades.
    +
    + This driver can also be built as a module. If so, the module
    + will be called ibmpex.
    +
    config SENSORS_IT87
    tristate "ITE IT87xx and compatibles"
    select HWMON_VID
    diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
    index a133981..31da6fe 100644
    --- a/drivers/hwmon/Makefile
    +++ b/drivers/hwmon/Makefile
    @@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_FSCPOS) += fscpos.o
    obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
    obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
    obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
    +obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
    obj-$(CONFIG_SENSORS_IT87) += it87.o
    obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
    obj-$(CONFIG_SENSORS_LM63) += lm63.o
    diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c
    new file mode 100644
    index 0000000..10f1205
    --- /dev/null
    +++ b/drivers/hwmon/ibmpex.c
    @@ -0,0 +1,600 @@
    +/*
    + * 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/mutex.h>
    +
    +#define REFRESH_INTERVAL (5 * HZ)
    +#define DRVNAME "ibmpex"
    +
    +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 value;
    + s16 max;
    + s16 min;
    + int multiplier;
    +
    + struct sensor_device_attribute attr_value;
    + struct sensor_device_attribute attr_max;
    + struct sensor_device_attribute attr_min;
    +};
    +
    +struct ibmpex_bmc_data {
    + struct list_head list;
    + struct class_device *class_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:
    + printk(KERN_ERR "%s: request_settime=%x\n", __FUNCTION__, err);
    + return err;
    +out:
    + printk(KERN_ERR "%s: validate_addr=%x\n", __FUNCTION__, err);
    + return err;
    +}
    +
    +static int ibmpex_ver_check(struct ibmpex_bmc_data *data)
    +{
    + data->tx_msg_data[0] = 0x1;
    + 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];
    +
    + printk(KERN_INFO DRVNAME ": Found BMC with sensor interface "
    + "v%d.%d %d-%02d-%02d on interface %d\n",
    + data->sensor_major,
    + data->sensor_minor,
    + data->rx_msg_data[3] | ((u16)data->rx_msg_data[2] << 8),
    + 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] = 0x2;
    + 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] = 0x3;
    + 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] = 0x6;
    + 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) {
    + printk(KERN_ERR "Error reading sensor %d, please check.\n",
    + sensor);
    + return -ENOENT;
    + }
    +
    + 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].value = ((u16)data->rx_msg_data[16] << 8) |
    + data->rx_msg_data[17];
    + data->sensors[i].min = ((u16)data->rx_msg_data[18] << 8) |
    + data->rx_msg_data[19];
    + data->sensors[i].max = ((u16)data->rx_msg_data[20] << 8) |
    + data->rx_msg_data[21];
    + }
    +
    + 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 *attr = to_sensor_dev_attr(devattr);
    + int iface = attr->index >> 8;
    + int sensor = attr->index & 0xFF;
    + struct ibmpex_bmc_data *data = get_bmc_data(iface);
    + int multiplier = data->sensors[sensor].multiplier;
    + ibmpex_update_device(data);
    +
    + return sprintf(buf, "%d\n", data->sensors[sensor].value * multiplier);
    +}
    +
    +static ssize_t ibmpex_show_max(struct device *dev,
    + struct device_attribute *devattr,
    + char *buf)
    +{
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    + int iface = attr->index >> 8;
    + int sensor = attr->index & 0xFF;
    + struct ibmpex_bmc_data *data = get_bmc_data(iface);
    + int multiplier = data->sensors[sensor].multiplier;
    + ibmpex_update_device(data);
    +
    + return sprintf(buf, "%d\n", data->sensors[sensor].max * multiplier);
    +}
    +
    +static ssize_t ibmpex_show_min(struct device *dev,
    + struct device_attribute *devattr,
    + char *buf)
    +{
    + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    + int iface = attr->index >> 8;
    + int sensor = attr->index & 0xFF;
    + struct ibmpex_bmc_data *data = get_bmc_data(iface);
    + int multiplier = data->sensors[sensor].multiplier;
    + ibmpex_update_device(data);
    +
    + return sprintf(buf, "%d\n", data->sensors[sensor].min * multiplier);
    +}
    +
    +static int is_power_sensor(const char *sensor_id, int len)
    +{
    + if (len < 3)
    + return 0;
    +
    + if (sensor_id[0] == 0x70 &&
    + sensor_id[1] == 0x77 &&
    + sensor_id[2] == 0x72)
    + return 1;
    + return 0;
    +}
    +
    +static int is_temp_sensor(const char *sensor_id, int len)
    +{
    + if (len < 3)
    + return 0;
    +
    + if (sensor_id[0] == 0x74 &&
    + sensor_id[1] == 0x65 &&
    + sensor_id[2] == 0x6D)
    + return 1;
    + return 0;
    +}
    +
    +static int power_sensor_multiplier(const char *sensor_id, int len)
    +{
    + int i;
    +
    + for (i = 3; i < len - 1; i++)
    + if (sensor_id[i] == 0x41 &&
    + sensor_id[i + 1] == 0x43)
    + return 1000;
    +
    + return 100;
    +}
    +
    +static int ibmpex_find_sensors(struct ibmpex_bmc_data *data)
    +{
    + int i, err;
    + char *n, *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";
    + num_power++;
    + sensor_counter = num_power;
    + data->sensors[i].multiplier =
    + power_sensor_multiplier(data->rx_msg_data,
    + data->rx_msg_len);
    + } else if (is_temp_sensor(data->rx_msg_data,
    + data->rx_msg_len)) {
    + sensor_type = "temp";
    + num_temp++;
    + sensor_counter = num_temp;
    + data->sensors[i].multiplier = 1;
    + } else
    + continue;
    +
    + data->sensors[i].in_use = 1;
    +
    + /* Create value attribute */
    + n = kmalloc(32, GFP_KERNEL);
    + if (!n)
    + goto exit_remove;
    + sprintf(n, "%s%d_input", sensor_type, sensor_counter);
    + data->sensors[i].attr_value.dev_attr.attr.name = n;
    + data->sensors[i].attr_value.dev_attr.attr.mode = S_IRUGO;
    + data->sensors[i].attr_value.dev_attr.show = ibmpex_show_sensor;
    + data->sensors[i].attr_value.index = (data->interface << 8) |
    + (i & 0xFF);
    +
    + err = device_create_file(data->bmc_device,
    + &data->sensors[i].attr_value.dev_attr);
    + if (err) {
    + data->sensors[i].attr_value.dev_attr.attr.name = NULL;
    + kfree(n);
    + goto exit_remove;
    + }
    +
    + /* Create max attribute */
    + n = kmalloc(32, GFP_KERNEL);
    + if (!n)
    + goto exit_remove;
    + sprintf(n, "%s%d_max_input", sensor_type, sensor_counter);
    + data->sensors[i].attr_max.dev_attr.attr.name = n;
    + data->sensors[i].attr_max.dev_attr.attr.mode = S_IRUGO;
    + data->sensors[i].attr_max.dev_attr.show = ibmpex_show_max;
    + data->sensors[i].attr_max.index = (data->interface << 8) |
    + (i & 0xFF);
    +
    + err = device_create_file(data->bmc_device,
    + &data->sensors[i].attr_max.dev_attr);
    + if (err) {
    + data->sensors[i].attr_max.dev_attr.attr.name = NULL;
    + kfree(n);
    + goto exit_remove;
    + }
    +
    + /* Create min attribute */
    + n = kmalloc(32, GFP_KERNEL);
    + if (!n)
    + goto exit_remove;
    + sprintf(n, "%s%d_min_input", sensor_type, sensor_counter);
    + data->sensors[i].attr_min.dev_attr.attr.name = n;
    + data->sensors[i].attr_min.dev_attr.attr.mode = S_IRUGO;
    + data->sensors[i].attr_min.dev_attr.show = ibmpex_show_min;
    + data->sensors[i].attr_min.index = (data->interface << 8) |
    + (i & 0xFF);
    +
    + err = device_create_file(data->bmc_device,
    + &data->sensors[i].attr_min.dev_attr);
    + if (err) {
    + data->sensors[i].attr_min.dev_attr.attr.name = NULL;
    + kfree(n);
    + 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:
    + for (i = 0; i < data->num_sensors; i++) {
    + if (data->sensors[i].attr_value.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_value.dev_attr);
    + kfree(data->sensors[i].attr_value.dev_attr.attr.name);
    + if (data->sensors[i].attr_max.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_max.dev_attr);
    + kfree(data->sensors[i].attr_max.dev_attr.attr.name);
    + if (data->sensors[i].attr_min.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_min.dev_attr);
    + kfree(data->sensors[i].attr_min.dev_attr.attr.name);
    + }
    +
    + kfree(data->sensors);
    + return -ENOENT;
    +}
    +
    +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) {
    + printk(KERN_ERR DRVNAME ": Insufficient memory for BMC "
    + "interface %d.\n", data->interface);
    + 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) {
    + printk(KERN_ERR DRVNAME ": Error, 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 = 0x3A;
    + data->tx_message.cmd = 0x3C;
    + 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->class_dev = hwmon_device_register(data->bmc_device);
    +
    + if (IS_ERR(data->class_dev)) {
    + printk(KERN_ERR DRVNAME ": Error, unable to register hwmon "
    + "class device for interface %d\n",
    + data->interface);
    + kfree(data);
    + return;
    + }
    +
    + /* finally add the new bmc data to the bmc data list */
    + list_add_tail(&data->list, &driver_data.bmc_data);
    +
    + /* Now go find all the sensors */
    + err = ibmpex_find_sensors(data);
    + if (err) {
    + printk(KERN_ERR "Error %d allocating memory\n", err);
    + goto out_register;
    + }
    +
    + return;
    +
    +out_register:
    + hwmon_device_unregister(data->class_dev);
    +out_user:
    + ipmi_destroy_user(data->user);
    +out:
    + kfree(data);
    +}
    +
    +static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
    +{
    + int i;
    +
    + device_remove_file(data->bmc_device, &sensor_dev_attr_name.dev_attr);
    + for (i = 0; i < data->num_sensors; i++) {
    + if (data->sensors[i].attr_max.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_max.dev_attr);
    + kfree(data->sensors[i].attr_max.dev_attr.attr.name);
    + if (data->sensors[i].attr_min.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_min.dev_attr);
    + kfree(data->sensors[i].attr_min.dev_attr.attr.name);
    + if (data->sensors[i].attr_value.dev_attr.attr.name)
    + device_remove_file(data->bmc_device,
    + &data->sensors[i].attr_value.dev_attr);
    + kfree(data->sensors[i].attr_value.dev_attr.attr.name);
    + }
    + list_del(&data->list);
    + hwmon_device_unregister(data->class_dev);
    + ipmi_destroy_user(data->user);
    + if (data->sensors)
    + 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) {
    + printk(KERN_ERR "Received msgid (%02x) and transmitted "
    + "msgid (%02x) mismatch!\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);[unhandled content-type:application/pgp-signature]
    \
     
     \ /
      Last update: 2007-08-28 18:51    [W:3.057 / U:1.076 seconds]
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