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![Rob Herring](/assets/img/avatar_default.png)
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230714174607.4057185-1-robh@kernel.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
307 lines
8 KiB
C
307 lines
8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Power Interface(SCPI) based hwmon sensor driver
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*
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* Copyright (C) 2015 ARM Ltd.
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* Punit Agrawal <punit.agrawal@arm.com>
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*/
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#include <linux/hwmon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/scpi_protocol.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/thermal.h>
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struct sensor_data {
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unsigned int scale;
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struct scpi_sensor_info info;
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struct device_attribute dev_attr_input;
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struct device_attribute dev_attr_label;
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char input[20];
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char label[20];
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};
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struct scpi_thermal_zone {
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int sensor_id;
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struct scpi_sensors *scpi_sensors;
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};
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struct scpi_sensors {
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struct scpi_ops *scpi_ops;
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struct sensor_data *data;
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struct list_head thermal_zones;
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struct attribute **attrs;
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struct attribute_group group;
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const struct attribute_group *groups[2];
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};
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static const u32 gxbb_scpi_scale[] = {
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[TEMPERATURE] = 1, /* (celsius) */
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[VOLTAGE] = 1000, /* (millivolts) */
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[CURRENT] = 1000, /* (milliamperes) */
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[POWER] = 1000000, /* (microwatts) */
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[ENERGY] = 1000000, /* (microjoules) */
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};
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static const u32 scpi_scale[] = {
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[TEMPERATURE] = 1000, /* (millicelsius) */
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[VOLTAGE] = 1000, /* (millivolts) */
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[CURRENT] = 1000, /* (milliamperes) */
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[POWER] = 1000000, /* (microwatts) */
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[ENERGY] = 1000000, /* (microjoules) */
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};
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static void scpi_scale_reading(u64 *value, struct sensor_data *sensor)
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{
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if (scpi_scale[sensor->info.class] != sensor->scale) {
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*value *= scpi_scale[sensor->info.class];
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do_div(*value, sensor->scale);
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}
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}
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static int scpi_read_temp(struct thermal_zone_device *tz, int *temp)
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{
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struct scpi_thermal_zone *zone = thermal_zone_device_priv(tz);
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struct scpi_sensors *scpi_sensors = zone->scpi_sensors;
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struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
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struct sensor_data *sensor = &scpi_sensors->data[zone->sensor_id];
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u64 value;
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int ret;
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ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
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if (ret)
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return ret;
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scpi_scale_reading(&value, sensor);
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*temp = value;
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return 0;
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}
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/* hwmon callback functions */
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static ssize_t
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scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct scpi_sensors *scpi_sensors = dev_get_drvdata(dev);
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struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
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struct sensor_data *sensor;
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u64 value;
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int ret;
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sensor = container_of(attr, struct sensor_data, dev_attr_input);
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ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
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if (ret)
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return ret;
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scpi_scale_reading(&value, sensor);
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/*
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* Temperature sensor values are treated as signed values based on
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* observation even though that is not explicitly specified, and
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* because an unsigned u64 temperature does not really make practical
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* sense especially when the temperature is below zero degrees Celsius.
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*/
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if (sensor->info.class == TEMPERATURE)
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return sprintf(buf, "%lld\n", (s64)value);
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return sprintf(buf, "%llu\n", value);
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}
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static ssize_t
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scpi_show_label(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct sensor_data *sensor;
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sensor = container_of(attr, struct sensor_data, dev_attr_label);
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return sprintf(buf, "%s\n", sensor->info.name);
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}
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static const struct thermal_zone_device_ops scpi_sensor_ops = {
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.get_temp = scpi_read_temp,
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};
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static const struct of_device_id scpi_of_match[] = {
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{.compatible = "arm,scpi-sensors", .data = &scpi_scale},
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{.compatible = "amlogic,meson-gxbb-scpi-sensors", .data = &gxbb_scpi_scale},
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{},
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};
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MODULE_DEVICE_TABLE(of, scpi_of_match);
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static int scpi_hwmon_probe(struct platform_device *pdev)
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{
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u16 nr_sensors, i;
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const u32 *scale;
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int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0;
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int num_energy = 0;
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struct scpi_ops *scpi_ops;
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struct device *hwdev, *dev = &pdev->dev;
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struct scpi_sensors *scpi_sensors;
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int idx, ret;
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scpi_ops = get_scpi_ops();
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if (!scpi_ops)
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return -EPROBE_DEFER;
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ret = scpi_ops->sensor_get_capability(&nr_sensors);
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if (ret)
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return ret;
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if (!nr_sensors)
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return -ENODEV;
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scpi_sensors = devm_kzalloc(dev, sizeof(*scpi_sensors), GFP_KERNEL);
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if (!scpi_sensors)
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return -ENOMEM;
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scpi_sensors->data = devm_kcalloc(dev, nr_sensors,
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sizeof(*scpi_sensors->data), GFP_KERNEL);
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if (!scpi_sensors->data)
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return -ENOMEM;
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scpi_sensors->attrs = devm_kcalloc(dev, (nr_sensors * 2) + 1,
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sizeof(*scpi_sensors->attrs), GFP_KERNEL);
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if (!scpi_sensors->attrs)
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return -ENOMEM;
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scpi_sensors->scpi_ops = scpi_ops;
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scale = of_device_get_match_data(&pdev->dev);
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if (!scale) {
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dev_err(&pdev->dev, "Unable to initialize scpi-hwmon data\n");
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return -ENODEV;
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}
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for (i = 0, idx = 0; i < nr_sensors; i++) {
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struct sensor_data *sensor = &scpi_sensors->data[idx];
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ret = scpi_ops->sensor_get_info(i, &sensor->info);
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if (ret)
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return ret;
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switch (sensor->info.class) {
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case TEMPERATURE:
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snprintf(sensor->input, sizeof(sensor->input),
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"temp%d_input", num_temp + 1);
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snprintf(sensor->label, sizeof(sensor->input),
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"temp%d_label", num_temp + 1);
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num_temp++;
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break;
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case VOLTAGE:
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snprintf(sensor->input, sizeof(sensor->input),
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"in%d_input", num_volt);
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snprintf(sensor->label, sizeof(sensor->input),
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"in%d_label", num_volt);
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num_volt++;
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break;
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case CURRENT:
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snprintf(sensor->input, sizeof(sensor->input),
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"curr%d_input", num_current + 1);
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snprintf(sensor->label, sizeof(sensor->input),
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"curr%d_label", num_current + 1);
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num_current++;
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break;
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case POWER:
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snprintf(sensor->input, sizeof(sensor->input),
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"power%d_input", num_power + 1);
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snprintf(sensor->label, sizeof(sensor->input),
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"power%d_label", num_power + 1);
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num_power++;
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break;
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case ENERGY:
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snprintf(sensor->input, sizeof(sensor->input),
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"energy%d_input", num_energy + 1);
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snprintf(sensor->label, sizeof(sensor->input),
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"energy%d_label", num_energy + 1);
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num_energy++;
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break;
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default:
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continue;
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}
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sensor->scale = scale[sensor->info.class];
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sensor->dev_attr_input.attr.mode = 0444;
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sensor->dev_attr_input.show = scpi_show_sensor;
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sensor->dev_attr_input.attr.name = sensor->input;
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sensor->dev_attr_label.attr.mode = 0444;
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sensor->dev_attr_label.show = scpi_show_label;
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sensor->dev_attr_label.attr.name = sensor->label;
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scpi_sensors->attrs[idx << 1] = &sensor->dev_attr_input.attr;
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scpi_sensors->attrs[(idx << 1) + 1] = &sensor->dev_attr_label.attr;
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sysfs_attr_init(scpi_sensors->attrs[idx << 1]);
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sysfs_attr_init(scpi_sensors->attrs[(idx << 1) + 1]);
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idx++;
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}
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scpi_sensors->group.attrs = scpi_sensors->attrs;
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scpi_sensors->groups[0] = &scpi_sensors->group;
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platform_set_drvdata(pdev, scpi_sensors);
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hwdev = devm_hwmon_device_register_with_groups(dev,
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"scpi_sensors", scpi_sensors, scpi_sensors->groups);
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if (IS_ERR(hwdev))
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return PTR_ERR(hwdev);
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/*
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* Register the temperature sensors with the thermal framework
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* to allow their usage in setting up the thermal zones from
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* device tree.
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*
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* NOTE: Not all temperature sensors maybe used for thermal
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* control
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*/
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INIT_LIST_HEAD(&scpi_sensors->thermal_zones);
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for (i = 0; i < nr_sensors; i++) {
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struct sensor_data *sensor = &scpi_sensors->data[i];
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struct thermal_zone_device *z;
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struct scpi_thermal_zone *zone;
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if (sensor->info.class != TEMPERATURE)
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continue;
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zone = devm_kzalloc(dev, sizeof(*zone), GFP_KERNEL);
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if (!zone)
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return -ENOMEM;
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zone->sensor_id = i;
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zone->scpi_sensors = scpi_sensors;
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z = devm_thermal_of_zone_register(dev,
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sensor->info.sensor_id,
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zone,
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&scpi_sensor_ops);
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/*
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* The call to thermal_zone_of_sensor_register returns
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* an error for sensors that are not associated with
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* any thermal zones or if the thermal subsystem is
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* not configured.
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*/
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if (IS_ERR(z))
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devm_kfree(dev, zone);
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}
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return 0;
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}
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static struct platform_driver scpi_hwmon_platdrv = {
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.driver = {
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.name = "scpi-hwmon",
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.of_match_table = scpi_of_match,
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},
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.probe = scpi_hwmon_probe,
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};
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module_platform_driver(scpi_hwmon_platdrv);
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MODULE_AUTHOR("Punit Agrawal <punit.agrawal@arm.com>");
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MODULE_DESCRIPTION("ARM SCPI HWMON interface driver");
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MODULE_LICENSE("GPL v2");
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