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/*
* System Control and Power Interface(SCPI) based hwmon sensor driver
*
* Copyright (C) 2015 ARM Ltd.
* Punit Agrawal <punit.agrawal@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/scpi_protocol.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
struct sensor_data {
struct scpi_sensor_info info;
struct device_attribute dev_attr_input;
struct device_attribute dev_attr_label;
char input[20];
char label[20];
};
struct scpi_sensors {
struct scpi_ops *scpi_ops;
struct sensor_data *data;
struct attribute **attrs;
struct attribute_group group;
const struct attribute_group *groups[2];
};
/* hwmon callback functions */
static ssize_t
scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scpi_sensors *scpi_sensors = dev_get_drvdata(dev);
struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
struct sensor_data *sensor;
u32 value;
int ret;
sensor = container_of(attr, struct sensor_data, dev_attr_input);
ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
if (ret)
return ret;
return sprintf(buf, "%u\n", value);
}
static ssize_t
scpi_show_label(struct device *dev, struct device_attribute *attr, char *buf)
{
struct sensor_data *sensor;
sensor = container_of(attr, struct sensor_data, dev_attr_label);
return sprintf(buf, "%s\n", sensor->info.name);
}
static int scpi_hwmon_probe(struct platform_device *pdev)
{
u16 nr_sensors, i;
int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0;
struct scpi_ops *scpi_ops;
struct device *hwdev, *dev = &pdev->dev;
struct scpi_sensors *scpi_sensors;
int ret;
scpi_ops = get_scpi_ops();
if (!scpi_ops)
return -EPROBE_DEFER;
ret = scpi_ops->sensor_get_capability(&nr_sensors);
if (ret)
return ret;
if (!nr_sensors)
return -ENODEV;
scpi_sensors = devm_kzalloc(dev, sizeof(*scpi_sensors), GFP_KERNEL);
if (!scpi_sensors)
return -ENOMEM;
scpi_sensors->data = devm_kcalloc(dev, nr_sensors,
sizeof(*scpi_sensors->data), GFP_KERNEL);
if (!scpi_sensors->data)
return -ENOMEM;
scpi_sensors->attrs = devm_kcalloc(dev, (nr_sensors * 2) + 1,
sizeof(*scpi_sensors->attrs), GFP_KERNEL);
if (!scpi_sensors->attrs)
return -ENOMEM;
scpi_sensors->scpi_ops = scpi_ops;
for (i = 0; i < nr_sensors; i++) {
struct sensor_data *sensor = &scpi_sensors->data[i];
ret = scpi_ops->sensor_get_info(i, &sensor->info);
if (ret)
return ret;
switch (sensor->info.class) {
case TEMPERATURE:
snprintf(sensor->input, sizeof(sensor->input),
"temp%d_input", num_temp + 1);
snprintf(sensor->label, sizeof(sensor->input),
"temp%d_label", num_temp + 1);
num_temp++;
break;
case VOLTAGE:
snprintf(sensor->input, sizeof(sensor->input),
"in%d_input", num_volt);
snprintf(sensor->label, sizeof(sensor->input),
"in%d_label", num_volt);
num_volt++;
break;
case CURRENT:
snprintf(sensor->input, sizeof(sensor->input),
"curr%d_input", num_current + 1);
snprintf(sensor->label, sizeof(sensor->input),
"curr%d_label", num_current + 1);
num_current++;
break;
case POWER:
snprintf(sensor->input, sizeof(sensor->input),
"power%d_input", num_power + 1);
snprintf(sensor->label, sizeof(sensor->input),
"power%d_label", num_power + 1);
num_power++;
break;
default:
break;
}
sensor->dev_attr_input.attr.mode = S_IRUGO;
sensor->dev_attr_input.show = scpi_show_sensor;
sensor->dev_attr_input.attr.name = sensor->input;
sensor->dev_attr_label.attr.mode = S_IRUGO;
sensor->dev_attr_label.show = scpi_show_label;
sensor->dev_attr_label.attr.name = sensor->label;
scpi_sensors->attrs[i << 1] = &sensor->dev_attr_input.attr;
scpi_sensors->attrs[(i << 1) + 1] = &sensor->dev_attr_label.attr;
sysfs_attr_init(scpi_sensors->attrs[i << 1]);
sysfs_attr_init(scpi_sensors->attrs[(i << 1) + 1]);
}
scpi_sensors->group.attrs = scpi_sensors->attrs;
scpi_sensors->groups[0] = &scpi_sensors->group;
hwdev = devm_hwmon_device_register_with_groups(dev,
"scpi_sensors", scpi_sensors, scpi_sensors->groups);
return PTR_ERR_OR_ZERO(hwdev);
}
static const struct of_device_id scpi_of_match[] = {
{.compatible = "arm,scpi-sensors"},
{},
};
static struct platform_driver scpi_hwmon_platdrv = {
.driver = {
.name = "scpi-hwmon",
.owner = THIS_MODULE,
.of_match_table = scpi_of_match,
},
.probe = scpi_hwmon_probe,
};
module_platform_driver(scpi_hwmon_platdrv);
MODULE_AUTHOR("Punit Agrawal <punit.agrawal@arm.com>");
MODULE_DESCRIPTION("ARM SCPI HWMON interface driver");
MODULE_LICENSE("GPL v2");
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