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![Julia Lawall](/assets/img/avatar_default.png)
The thermal_zone_of_device_ops structure is only passed as the fourth argument to devm_thermal_zone_of_sensor_register, which is declared as const. Thus the thermal_zone_of_device_ops structure itself can be const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
309 lines
8.1 KiB
C
309 lines
8.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 = S_IRUGO;
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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 = S_IRUGO;
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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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continue;
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}
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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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