2014-07-08 17:08:38 +08:00
|
|
|
/*
|
|
|
|
* IBM PowerNV platform sensors for temperature/fan/voltage/power
|
|
|
|
* Copyright (C) 2014 IBM
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define DRVNAME "ibmpowernv"
|
|
|
|
#define pr_fmt(fmt) DRVNAME ": " fmt
|
|
|
|
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/hwmon.h>
|
|
|
|
#include <linux/hwmon-sysfs.h>
|
|
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <asm/opal.h>
|
|
|
|
#include <linux/err.h>
|
|
|
|
|
|
|
|
#define MAX_ATTR_LEN 32
|
|
|
|
|
|
|
|
/* Sensor suffix name from DT */
|
|
|
|
#define DT_FAULT_ATTR_SUFFIX "faulted"
|
|
|
|
#define DT_DATA_ATTR_SUFFIX "data"
|
|
|
|
#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Enumerates all the types of sensors in the POWERNV platform and does index
|
|
|
|
* into 'struct sensor_group'
|
|
|
|
*/
|
|
|
|
enum sensors {
|
|
|
|
FAN,
|
|
|
|
AMBIENT_TEMP,
|
|
|
|
POWER_SUPPLY,
|
|
|
|
POWER_INPUT,
|
|
|
|
MAX_SENSOR_TYPE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct sensor_group {
|
|
|
|
const char *name;
|
|
|
|
const char *compatible;
|
|
|
|
struct attribute_group group;
|
|
|
|
u32 attr_count;
|
|
|
|
} sensor_groups[] = {
|
|
|
|
{"fan", "ibm,opal-sensor-cooling-fan"},
|
|
|
|
{"temp", "ibm,opal-sensor-amb-temp"},
|
|
|
|
{"in", "ibm,opal-sensor-power-supply"},
|
|
|
|
{"power", "ibm,opal-sensor-power"}
|
|
|
|
};
|
|
|
|
|
|
|
|
struct sensor_data {
|
|
|
|
u32 id; /* An opaque id of the firmware for each sensor */
|
|
|
|
enum sensors type;
|
|
|
|
char name[MAX_ATTR_LEN];
|
|
|
|
struct device_attribute dev_attr;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct platform_data {
|
|
|
|
const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
|
|
|
|
u32 sensors_count; /* Total count of sensors from each group */
|
|
|
|
};
|
|
|
|
|
|
|
|
static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct sensor_data *sdata = container_of(devattr, struct sensor_data,
|
|
|
|
dev_attr);
|
|
|
|
ssize_t ret;
|
|
|
|
u32 x;
|
|
|
|
|
|
|
|
ret = opal_get_sensor_data(sdata->id, &x);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Convert temperature to milli-degrees */
|
|
|
|
if (sdata->type == AMBIENT_TEMP)
|
|
|
|
x *= 1000;
|
|
|
|
/* Convert power to micro-watts */
|
|
|
|
else if (sdata->type == POWER_INPUT)
|
|
|
|
x *= 1000000;
|
|
|
|
|
|
|
|
return sprintf(buf, "%u\n", x);
|
|
|
|
}
|
|
|
|
|
2014-11-05 19:15:14 +08:00
|
|
|
static int get_sensor_index_attr(const char *name, u32 *index,
|
2014-07-08 17:08:38 +08:00
|
|
|
char *attr)
|
|
|
|
{
|
|
|
|
char *hash_pos = strchr(name, '#');
|
|
|
|
char buf[8] = { 0 };
|
|
|
|
char *dash_pos;
|
|
|
|
u32 copy_len;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (!hash_pos)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
dash_pos = strchr(hash_pos, '-');
|
|
|
|
if (!dash_pos)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
copy_len = dash_pos - hash_pos - 1;
|
|
|
|
if (copy_len >= sizeof(buf))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
strncpy(buf, hash_pos + 1, copy_len);
|
|
|
|
|
|
|
|
err = kstrtou32(buf, 10, index);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This function translates the DT node name into the 'hwmon' attribute name.
|
|
|
|
* IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
|
|
|
|
* which need to be mapped as fan2_input, temp1_max respectively before
|
|
|
|
* populating them inside hwmon device class.
|
|
|
|
*/
|
2014-11-05 19:15:14 +08:00
|
|
|
static int create_hwmon_attr_name(struct device *dev, enum sensors type,
|
2014-07-08 17:08:38 +08:00
|
|
|
const char *node_name,
|
|
|
|
char *hwmon_attr_name)
|
|
|
|
{
|
|
|
|
char attr_suffix[MAX_ATTR_LEN];
|
|
|
|
char *attr_name;
|
|
|
|
u32 index;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = get_sensor_index_attr(node_name, &index, attr_suffix);
|
|
|
|
if (err) {
|
|
|
|
dev_err(dev, "Sensor device node name '%s' is invalid\n",
|
|
|
|
node_name);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) {
|
|
|
|
attr_name = "fault";
|
|
|
|
} else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) {
|
|
|
|
attr_name = "input";
|
|
|
|
} else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) {
|
|
|
|
if (type == AMBIENT_TEMP)
|
|
|
|
attr_name = "max";
|
|
|
|
else if (type == FAN)
|
|
|
|
attr_name = "min";
|
|
|
|
else
|
|
|
|
return -ENOENT;
|
|
|
|
} else {
|
|
|
|
return -ENOENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s",
|
|
|
|
sensor_groups[type].name, index, attr_name);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-11-05 19:15:14 +08:00
|
|
|
static int populate_attr_groups(struct platform_device *pdev)
|
2014-07-08 17:08:38 +08:00
|
|
|
{
|
|
|
|
struct platform_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
const struct attribute_group **pgroups = pdata->attr_groups;
|
|
|
|
struct device_node *opal, *np;
|
|
|
|
enum sensors type;
|
|
|
|
|
|
|
|
opal = of_find_node_by_path("/ibm,opal/sensors");
|
|
|
|
for_each_child_of_node(opal, np) {
|
|
|
|
if (np->name == NULL)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
for (type = 0; type < MAX_SENSOR_TYPE; type++)
|
|
|
|
if (of_device_is_compatible(np,
|
|
|
|
sensor_groups[type].compatible)) {
|
|
|
|
sensor_groups[type].attr_count++;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
of_node_put(opal);
|
|
|
|
|
|
|
|
for (type = 0; type < MAX_SENSOR_TYPE; type++) {
|
|
|
|
sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
|
|
|
|
sizeof(struct attribute *) *
|
|
|
|
(sensor_groups[type].attr_count + 1),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!sensor_groups[type].group.attrs)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
pgroups[type] = &sensor_groups[type].group;
|
|
|
|
pdata->sensors_count += sensor_groups[type].attr_count;
|
|
|
|
sensor_groups[type].attr_count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Iterate through the device tree for each child of 'sensors' node, create
|
|
|
|
* a sysfs attribute file, the file is named by translating the DT node name
|
|
|
|
* to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
|
|
|
|
* etc..
|
|
|
|
*/
|
2014-11-05 19:15:14 +08:00
|
|
|
static int create_device_attrs(struct platform_device *pdev)
|
2014-07-08 17:08:38 +08:00
|
|
|
{
|
|
|
|
struct platform_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
const struct attribute_group **pgroups = pdata->attr_groups;
|
|
|
|
struct device_node *opal, *np;
|
|
|
|
struct sensor_data *sdata;
|
2014-08-01 12:38:47 +08:00
|
|
|
u32 sensor_id;
|
2014-07-08 17:08:38 +08:00
|
|
|
enum sensors type;
|
|
|
|
u32 count = 0;
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
opal = of_find_node_by_path("/ibm,opal/sensors");
|
|
|
|
sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!sdata) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto exit_put_node;
|
|
|
|
}
|
|
|
|
|
|
|
|
for_each_child_of_node(opal, np) {
|
|
|
|
if (np->name == NULL)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
for (type = 0; type < MAX_SENSOR_TYPE; type++)
|
|
|
|
if (of_device_is_compatible(np,
|
|
|
|
sensor_groups[type].compatible))
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (type == MAX_SENSOR_TYPE)
|
|
|
|
continue;
|
|
|
|
|
2014-08-01 12:38:47 +08:00
|
|
|
if (of_property_read_u32(np, "sensor-id", &sensor_id)) {
|
2014-07-08 17:08:38 +08:00
|
|
|
dev_info(&pdev->dev,
|
|
|
|
"'sensor-id' missing in the node '%s'\n",
|
|
|
|
np->name);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
2014-08-01 12:38:47 +08:00
|
|
|
sdata[count].id = sensor_id;
|
2014-07-08 17:08:38 +08:00
|
|
|
sdata[count].type = type;
|
|
|
|
err = create_hwmon_attr_name(&pdev->dev, type, np->name,
|
|
|
|
sdata[count].name);
|
|
|
|
if (err)
|
|
|
|
goto exit_put_node;
|
|
|
|
|
|
|
|
sysfs_attr_init(&sdata[count].dev_attr.attr);
|
|
|
|
sdata[count].dev_attr.attr.name = sdata[count].name;
|
|
|
|
sdata[count].dev_attr.attr.mode = S_IRUGO;
|
|
|
|
sdata[count].dev_attr.show = show_sensor;
|
|
|
|
|
|
|
|
pgroups[type]->attrs[sensor_groups[type].attr_count++] =
|
|
|
|
&sdata[count++].dev_attr.attr;
|
|
|
|
}
|
|
|
|
|
|
|
|
exit_put_node:
|
|
|
|
of_node_put(opal);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2014-11-05 19:15:14 +08:00
|
|
|
static int ibmpowernv_probe(struct platform_device *pdev)
|
2014-07-08 17:08:38 +08:00
|
|
|
{
|
|
|
|
struct platform_data *pdata;
|
|
|
|
struct device *hwmon_dev;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
|
|
if (!pdata)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, pdata);
|
|
|
|
pdata->sensors_count = 0;
|
|
|
|
err = populate_attr_groups(pdev);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
/* Create sysfs attribute data for each sensor found in the DT */
|
|
|
|
err = create_device_attrs(pdev);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
/* Finally, register with hwmon */
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
|
|
|
|
pdata,
|
|
|
|
pdata->attr_groups);
|
|
|
|
|
|
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
|
|
}
|
|
|
|
|
2014-11-05 19:15:14 +08:00
|
|
|
static const struct platform_device_id opal_sensor_driver_ids[] = {
|
|
|
|
{
|
|
|
|
.name = "opal-sensor",
|
|
|
|
},
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);
|
|
|
|
|
2014-07-08 17:08:38 +08:00
|
|
|
static struct platform_driver ibmpowernv_driver = {
|
2014-11-05 19:15:14 +08:00
|
|
|
.probe = ibmpowernv_probe,
|
|
|
|
.id_table = opal_sensor_driver_ids,
|
|
|
|
.driver = {
|
|
|
|
.name = DRVNAME,
|
2014-07-08 17:08:38 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2014-11-12 16:36:47 +08:00
|
|
|
module_platform_driver(ibmpowernv_driver);
|
2014-07-08 17:08:38 +08:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
|
|
|
|
MODULE_DESCRIPTION("IBM POWERNV platform sensors");
|
|
|
|
MODULE_LICENSE("GPL");
|