mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Sudeep Holla](/assets/img/avatar_default.png)
SCPI specification version 1.1 extended the sensor from 32-bit to 64-bit values in order to accommodate new sensor class with 64-bit requirements Since the SCPI driver sets the higher 32-bit for older protocol version to zeros, there's no need to explicitly check the SCPI protocol version and the backward compatibility is maintainted. Acked-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Punit Agrawal <punit.agrawal@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
289 lines
7.4 KiB
C
289 lines
7.4 KiB
C
/*
|
|
* 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>
|
|
#include <linux/thermal.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_thermal_zone {
|
|
struct list_head list;
|
|
int sensor_id;
|
|
struct scpi_sensors *scpi_sensors;
|
|
struct thermal_zone_device *tzd;
|
|
};
|
|
|
|
struct scpi_sensors {
|
|
struct scpi_ops *scpi_ops;
|
|
struct sensor_data *data;
|
|
struct list_head thermal_zones;
|
|
struct attribute **attrs;
|
|
struct attribute_group group;
|
|
const struct attribute_group *groups[2];
|
|
};
|
|
|
|
static int scpi_read_temp(void *dev, int *temp)
|
|
{
|
|
struct scpi_thermal_zone *zone = dev;
|
|
struct scpi_sensors *scpi_sensors = zone->scpi_sensors;
|
|
struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
|
|
struct sensor_data *sensor = &scpi_sensors->data[zone->sensor_id];
|
|
u64 value;
|
|
int ret;
|
|
|
|
ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*temp = value;
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
u64 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, "%llu\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 void
|
|
unregister_thermal_zones(struct platform_device *pdev,
|
|
struct scpi_sensors *scpi_sensors)
|
|
{
|
|
struct list_head *pos;
|
|
|
|
list_for_each(pos, &scpi_sensors->thermal_zones) {
|
|
struct scpi_thermal_zone *zone;
|
|
|
|
zone = list_entry(pos, struct scpi_thermal_zone, list);
|
|
thermal_zone_of_sensor_unregister(&pdev->dev, zone->tzd);
|
|
}
|
|
}
|
|
|
|
static struct thermal_zone_of_device_ops scpi_sensor_ops = {
|
|
.get_temp = scpi_read_temp,
|
|
};
|
|
|
|
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, idx;
|
|
|
|
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, idx = 0; i < nr_sensors; i++) {
|
|
struct sensor_data *sensor = &scpi_sensors->data[idx];
|
|
|
|
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:
|
|
continue;
|
|
}
|
|
|
|
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[idx << 1] = &sensor->dev_attr_input.attr;
|
|
scpi_sensors->attrs[(idx << 1) + 1] = &sensor->dev_attr_label.attr;
|
|
|
|
sysfs_attr_init(scpi_sensors->attrs[idx << 1]);
|
|
sysfs_attr_init(scpi_sensors->attrs[(idx << 1) + 1]);
|
|
idx++;
|
|
}
|
|
|
|
scpi_sensors->group.attrs = scpi_sensors->attrs;
|
|
scpi_sensors->groups[0] = &scpi_sensors->group;
|
|
|
|
platform_set_drvdata(pdev, scpi_sensors);
|
|
|
|
hwdev = devm_hwmon_device_register_with_groups(dev,
|
|
"scpi_sensors", scpi_sensors, scpi_sensors->groups);
|
|
|
|
if (IS_ERR(hwdev))
|
|
return PTR_ERR(hwdev);
|
|
|
|
/*
|
|
* Register the temperature sensors with the thermal framework
|
|
* to allow their usage in setting up the thermal zones from
|
|
* device tree.
|
|
*
|
|
* NOTE: Not all temperature sensors maybe used for thermal
|
|
* control
|
|
*/
|
|
INIT_LIST_HEAD(&scpi_sensors->thermal_zones);
|
|
for (i = 0; i < nr_sensors; i++) {
|
|
struct sensor_data *sensor = &scpi_sensors->data[i];
|
|
struct scpi_thermal_zone *zone;
|
|
|
|
if (sensor->info.class != TEMPERATURE)
|
|
continue;
|
|
|
|
zone = devm_kzalloc(dev, sizeof(*zone), GFP_KERNEL);
|
|
if (!zone) {
|
|
ret = -ENOMEM;
|
|
goto unregister_tzd;
|
|
}
|
|
|
|
zone->sensor_id = i;
|
|
zone->scpi_sensors = scpi_sensors;
|
|
zone->tzd = thermal_zone_of_sensor_register(dev,
|
|
sensor->info.sensor_id, zone, &scpi_sensor_ops);
|
|
/*
|
|
* The call to thermal_zone_of_sensor_register returns
|
|
* an error for sensors that are not associated with
|
|
* any thermal zones or if the thermal subsystem is
|
|
* not configured.
|
|
*/
|
|
if (IS_ERR(zone->tzd)) {
|
|
devm_kfree(dev, zone);
|
|
continue;
|
|
}
|
|
list_add(&zone->list, &scpi_sensors->thermal_zones);
|
|
}
|
|
|
|
return 0;
|
|
|
|
unregister_tzd:
|
|
unregister_thermal_zones(pdev, scpi_sensors);
|
|
return ret;
|
|
}
|
|
|
|
static int scpi_hwmon_remove(struct platform_device *pdev)
|
|
{
|
|
struct scpi_sensors *scpi_sensors = platform_get_drvdata(pdev);
|
|
|
|
unregister_thermal_zones(pdev, scpi_sensors);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
.remove = scpi_hwmon_remove,
|
|
};
|
|
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");
|