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- // SPDX-License-Identifier: GPL-2.0
- /*
- * System Control and Management Interface(SCMI) based hwmon sensor driver
- *
- * Copyright (C) 2018-2021 ARM Ltd.
- * Sudeep Holla <[email protected]>
- */
- #include <linux/hwmon.h>
- #include <linux/module.h>
- #include <linux/scmi_protocol.h>
- #include <linux/slab.h>
- #include <linux/sysfs.h>
- #include <linux/thermal.h>
- static const struct scmi_sensor_proto_ops *sensor_ops;
- struct scmi_sensors {
- const struct scmi_protocol_handle *ph;
- const struct scmi_sensor_info **info[hwmon_max];
- };
- struct scmi_thermal_sensor {
- const struct scmi_protocol_handle *ph;
- const struct scmi_sensor_info *info;
- };
- static inline u64 __pow10(u8 x)
- {
- u64 r = 1;
- while (x--)
- r *= 10;
- return r;
- }
- static int scmi_hwmon_scale(const struct scmi_sensor_info *sensor, u64 *value)
- {
- int scale = sensor->scale;
- u64 f;
- switch (sensor->type) {
- case TEMPERATURE_C:
- case VOLTAGE:
- case CURRENT:
- scale += 3;
- break;
- case POWER:
- case ENERGY:
- scale += 6;
- break;
- default:
- break;
- }
- if (scale == 0)
- return 0;
- if (abs(scale) > 19)
- return -E2BIG;
- f = __pow10(abs(scale));
- if (scale > 0)
- *value *= f;
- else
- *value = div64_u64(*value, f);
- return 0;
- }
- static int scmi_hwmon_read_scaled_value(const struct scmi_protocol_handle *ph,
- const struct scmi_sensor_info *sensor,
- long *val)
- {
- int ret;
- u64 value;
- ret = sensor_ops->reading_get(ph, sensor->id, &value);
- if (ret)
- return ret;
- ret = scmi_hwmon_scale(sensor, &value);
- if (!ret)
- *val = value;
- return ret;
- }
- static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int channel, long *val)
- {
- const struct scmi_sensor_info *sensor;
- struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
- sensor = *(scmi_sensors->info[type] + channel);
- return scmi_hwmon_read_scaled_value(scmi_sensors->ph, sensor, val);
- }
- static int
- scmi_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int channel, const char **str)
- {
- const struct scmi_sensor_info *sensor;
- struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
- sensor = *(scmi_sensors->info[type] + channel);
- *str = sensor->name;
- return 0;
- }
- static umode_t
- scmi_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
- u32 attr, int channel)
- {
- const struct scmi_sensor_info *sensor;
- const struct scmi_sensors *scmi_sensors = drvdata;
- sensor = *(scmi_sensors->info[type] + channel);
- if (sensor)
- return 0444;
- return 0;
- }
- static const struct hwmon_ops scmi_hwmon_ops = {
- .is_visible = scmi_hwmon_is_visible,
- .read = scmi_hwmon_read,
- .read_string = scmi_hwmon_read_string,
- };
- static struct hwmon_chip_info scmi_chip_info = {
- .ops = &scmi_hwmon_ops,
- .info = NULL,
- };
- static int scmi_hwmon_thermal_get_temp(struct thermal_zone_device *tz,
- int *temp)
- {
- int ret;
- long value;
- struct scmi_thermal_sensor *th_sensor = tz->devdata;
- ret = scmi_hwmon_read_scaled_value(th_sensor->ph, th_sensor->info,
- &value);
- if (!ret)
- *temp = value;
- return ret;
- }
- static const struct thermal_zone_device_ops scmi_hwmon_thermal_ops = {
- .get_temp = scmi_hwmon_thermal_get_temp,
- };
- static int scmi_hwmon_add_chan_info(struct hwmon_channel_info *scmi_hwmon_chan,
- struct device *dev, int num,
- enum hwmon_sensor_types type, u32 config)
- {
- int i;
- u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
- return -ENOMEM;
- scmi_hwmon_chan->type = type;
- scmi_hwmon_chan->config = cfg;
- for (i = 0; i < num; i++, cfg++)
- *cfg = config;
- return 0;
- }
- static enum hwmon_sensor_types scmi_types[] = {
- [TEMPERATURE_C] = hwmon_temp,
- [VOLTAGE] = hwmon_in,
- [CURRENT] = hwmon_curr,
- [POWER] = hwmon_power,
- [ENERGY] = hwmon_energy,
- };
- static u32 hwmon_attributes[hwmon_max] = {
- [hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
- [hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
- [hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
- [hwmon_power] = HWMON_P_INPUT | HWMON_P_LABEL,
- [hwmon_energy] = HWMON_E_INPUT | HWMON_E_LABEL,
- };
- static int scmi_thermal_sensor_register(struct device *dev,
- const struct scmi_protocol_handle *ph,
- const struct scmi_sensor_info *sensor)
- {
- struct scmi_thermal_sensor *th_sensor;
- struct thermal_zone_device *tzd;
- th_sensor = devm_kzalloc(dev, sizeof(*th_sensor), GFP_KERNEL);
- if (!th_sensor)
- return -ENOMEM;
- th_sensor->ph = ph;
- th_sensor->info = sensor;
- /*
- * Try to register a temperature sensor with the Thermal Framework:
- * skip sensors not defined as part of any thermal zone (-ENODEV) but
- * report any other errors related to misconfigured zones/sensors.
- */
- tzd = devm_thermal_of_zone_register(dev, th_sensor->info->id, th_sensor,
- &scmi_hwmon_thermal_ops);
- if (IS_ERR(tzd)) {
- devm_kfree(dev, th_sensor);
- if (PTR_ERR(tzd) != -ENODEV)
- return PTR_ERR(tzd);
- dev_dbg(dev, "Sensor '%s' not attached to any thermal zone.\n",
- sensor->name);
- } else {
- dev_dbg(dev, "Sensor '%s' attached to thermal zone ID:%d\n",
- sensor->name, tzd->id);
- }
- return 0;
- }
- static int scmi_hwmon_probe(struct scmi_device *sdev)
- {
- int i, idx;
- u16 nr_sensors;
- enum hwmon_sensor_types type;
- struct scmi_sensors *scmi_sensors;
- const struct scmi_sensor_info *sensor;
- int nr_count[hwmon_max] = {0}, nr_types = 0, nr_count_temp = 0;
- const struct hwmon_chip_info *chip_info;
- struct device *hwdev, *dev = &sdev->dev;
- struct hwmon_channel_info *scmi_hwmon_chan;
- const struct hwmon_channel_info **ptr_scmi_ci;
- const struct scmi_handle *handle = sdev->handle;
- struct scmi_protocol_handle *ph;
- if (!handle)
- return -ENODEV;
- sensor_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_SENSOR, &ph);
- if (IS_ERR(sensor_ops))
- return PTR_ERR(sensor_ops);
- nr_sensors = sensor_ops->count_get(ph);
- if (!nr_sensors)
- return -EIO;
- scmi_sensors = devm_kzalloc(dev, sizeof(*scmi_sensors), GFP_KERNEL);
- if (!scmi_sensors)
- return -ENOMEM;
- scmi_sensors->ph = ph;
- for (i = 0; i < nr_sensors; i++) {
- sensor = sensor_ops->info_get(ph, i);
- if (!sensor)
- return -EINVAL;
- switch (sensor->type) {
- case TEMPERATURE_C:
- case VOLTAGE:
- case CURRENT:
- case POWER:
- case ENERGY:
- type = scmi_types[sensor->type];
- if (!nr_count[type])
- nr_types++;
- nr_count[type]++;
- break;
- }
- }
- if (nr_count[hwmon_temp])
- nr_count_temp = nr_count[hwmon_temp];
- scmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*scmi_hwmon_chan),
- GFP_KERNEL);
- if (!scmi_hwmon_chan)
- return -ENOMEM;
- ptr_scmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*ptr_scmi_ci),
- GFP_KERNEL);
- if (!ptr_scmi_ci)
- return -ENOMEM;
- scmi_chip_info.info = ptr_scmi_ci;
- chip_info = &scmi_chip_info;
- for (type = 0; type < hwmon_max; type++) {
- if (!nr_count[type])
- continue;
- scmi_hwmon_add_chan_info(scmi_hwmon_chan, dev, nr_count[type],
- type, hwmon_attributes[type]);
- *ptr_scmi_ci++ = scmi_hwmon_chan++;
- scmi_sensors->info[type] =
- devm_kcalloc(dev, nr_count[type],
- sizeof(*scmi_sensors->info), GFP_KERNEL);
- if (!scmi_sensors->info[type])
- return -ENOMEM;
- }
- for (i = nr_sensors - 1; i >= 0 ; i--) {
- sensor = sensor_ops->info_get(ph, i);
- if (!sensor)
- continue;
- switch (sensor->type) {
- case TEMPERATURE_C:
- case VOLTAGE:
- case CURRENT:
- case POWER:
- case ENERGY:
- type = scmi_types[sensor->type];
- idx = --nr_count[type];
- *(scmi_sensors->info[type] + idx) = sensor;
- break;
- }
- }
- hwdev = devm_hwmon_device_register_with_info(dev, "scmi_sensors",
- scmi_sensors, chip_info,
- NULL);
- if (IS_ERR(hwdev))
- return PTR_ERR(hwdev);
- for (i = 0; i < nr_count_temp; i++) {
- int ret;
- sensor = *(scmi_sensors->info[hwmon_temp] + i);
- if (!sensor)
- continue;
- /*
- * Warn on any misconfiguration related to thermal zones but
- * bail out of probing only on memory errors.
- */
- ret = scmi_thermal_sensor_register(dev, ph, sensor);
- if (ret) {
- if (ret == -ENOMEM)
- return ret;
- dev_warn(dev,
- "Thermal zone misconfigured for %s. err=%d\n",
- sensor->name, ret);
- }
- }
- return 0;
- }
- static const struct scmi_device_id scmi_id_table[] = {
- { SCMI_PROTOCOL_SENSOR, "hwmon" },
- { },
- };
- MODULE_DEVICE_TABLE(scmi, scmi_id_table);
- static struct scmi_driver scmi_hwmon_drv = {
- .name = "scmi-hwmon",
- .probe = scmi_hwmon_probe,
- .id_table = scmi_id_table,
- };
- module_scmi_driver(scmi_hwmon_drv);
- MODULE_AUTHOR("Sudeep Holla <[email protected]>");
- MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
- MODULE_LICENSE("GPL v2");
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