linux/drivers/hwmon/scpi-hwmon.c
Guenter Roeck 23297edbc1 hwmon: Convert remaining drivers to use SPDX identifier
This gets rid of the unnecessary license boilerplate, and avoids
having to deal with individual patches one by one.

No functional changes intended.

Reviewed-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-06-23 18:34:11 -07:00

300 lines
7.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Power Interface(SCPI) based hwmon sensor driver
*
* Copyright (C) 2015 ARM Ltd.
* Punit Agrawal <punit.agrawal@arm.com>
*/
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/of_device.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 {
unsigned int scale;
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 {
int sensor_id;
struct scpi_sensors *scpi_sensors;
};
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 const u32 gxbb_scpi_scale[] = {
[TEMPERATURE] = 1, /* (celsius) */
[VOLTAGE] = 1000, /* (millivolts) */
[CURRENT] = 1000, /* (milliamperes) */
[POWER] = 1000000, /* (microwatts) */
[ENERGY] = 1000000, /* (microjoules) */
};
static const u32 scpi_scale[] = {
[TEMPERATURE] = 1000, /* (millicelsius) */
[VOLTAGE] = 1000, /* (millivolts) */
[CURRENT] = 1000, /* (milliamperes) */
[POWER] = 1000000, /* (microwatts) */
[ENERGY] = 1000000, /* (microjoules) */
};
static void scpi_scale_reading(u64 *value, struct sensor_data *sensor)
{
if (scpi_scale[sensor->info.class] != sensor->scale) {
*value *= scpi_scale[sensor->info.class];
do_div(*value, sensor->scale);
}
}
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;
scpi_scale_reading(&value, sensor);
*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;
scpi_scale_reading(&value, sensor);
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 const struct thermal_zone_of_device_ops scpi_sensor_ops = {
.get_temp = scpi_read_temp,
};
static const struct of_device_id scpi_of_match[] = {
{.compatible = "arm,scpi-sensors", .data = &scpi_scale},
{.compatible = "amlogic,meson-gxbb-scpi-sensors", .data = &gxbb_scpi_scale},
{},
};
MODULE_DEVICE_TABLE(of, scpi_of_match);
static int scpi_hwmon_probe(struct platform_device *pdev)
{
u16 nr_sensors, i;
const u32 *scale;
int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0;
int num_energy = 0;
struct scpi_ops *scpi_ops;
struct device *hwdev, *dev = &pdev->dev;
struct scpi_sensors *scpi_sensors;
const struct of_device_id *of_id;
int idx, 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;
of_id = of_match_device(scpi_of_match, &pdev->dev);
if (!of_id) {
dev_err(&pdev->dev, "Unable to initialize scpi-hwmon data\n");
return -ENODEV;
}
scale = of_id->data;
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;
case ENERGY:
snprintf(sensor->input, sizeof(sensor->input),
"energy%d_input", num_energy + 1);
snprintf(sensor->label, sizeof(sensor->input),
"energy%d_label", num_energy + 1);
num_energy++;
break;
default:
continue;
}
sensor->scale = scale[sensor->info.class];
sensor->dev_attr_input.attr.mode = 0444;
sensor->dev_attr_input.show = scpi_show_sensor;
sensor->dev_attr_input.attr.name = sensor->input;
sensor->dev_attr_label.attr.mode = 0444;
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 thermal_zone_device *z;
struct scpi_thermal_zone *zone;
if (sensor->info.class != TEMPERATURE)
continue;
zone = devm_kzalloc(dev, sizeof(*zone), GFP_KERNEL);
if (!zone)
return -ENOMEM;
zone->sensor_id = i;
zone->scpi_sensors = scpi_sensors;
z = devm_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(z))
devm_kfree(dev, zone);
}
return 0;
}
static struct platform_driver scpi_hwmon_platdrv = {
.driver = {
.name = "scpi-hwmon",
.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");