mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
23297edbc1
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>
300 lines
7.7 KiB
C
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");
|