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299 lines
7.7 KiB
299 lines
7.7 KiB
// 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 <[email protected]> |
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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_device.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(void *dev, int *temp) |
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{ |
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struct scpi_thermal_zone *zone = dev; |
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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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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_of_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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const struct of_device_id *of_id; |
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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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of_id = of_match_device(scpi_of_match, &pdev->dev); |
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if (!of_id) { |
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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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scale = of_id->data; |
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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_zone_of_sensor_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 <[email protected]>"); |
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MODULE_DESCRIPTION("ARM SCPI HWMON interface driver"); |
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MODULE_LICENSE("GPL v2");
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