Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface(SCMI) based hwmon sensor driver
 *
 * Copyright (C) 2018-2020 ARM Ltd.
 * Sudeep Holla <sudeep.holla@arm.com>
 */
 
#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];
};
 
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(struct device *dev, enum hwmon_sensor_types type,
<------><------><------>   u32 attr, int channel, long *val)
{
<------>int ret;
<------>u64 value;
<------>const struct scmi_sensor_info *sensor;
<------>struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
 
<------>sensor = *(scmi_sensors->info[type] + channel);
<------>ret = sensor_ops->reading_get(scmi_sensors->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_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_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_chip] = HWMON_C_REGISTER_TZ,
<------>[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_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;
<------>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_get_protocol(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[hwmon_chip]++;
<------><------>nr_types++;
<------>}
 
<------>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);
 
<------>return PTR_ERR_OR_ZERO(hwdev);
}
 
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 <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
MODULE_LICENSE("GPL v2");