2017-06-15 09:53:17 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface(SCMI) based hwmon sensor driver
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*
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* Copyright (C) 2018 ARM Ltd.
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* Sudeep Holla <sudeep.holla@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/scmi_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 scmi_sensors {
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const struct scmi_handle *handle;
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const struct scmi_sensor_info **info[hwmon_max];
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};
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2019-05-08 18:46:35 +00:00
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static inline u64 __pow10(u8 x)
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{
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u64 r = 1;
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while (x--)
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r *= 10;
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return r;
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}
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static int scmi_hwmon_scale(const struct scmi_sensor_info *sensor, u64 *value)
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{
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s8 scale = sensor->scale;
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u64 f;
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switch (sensor->type) {
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case TEMPERATURE_C:
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case VOLTAGE:
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case CURRENT:
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scale += 3;
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break;
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case POWER:
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case ENERGY:
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scale += 6;
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break;
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default:
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break;
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}
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if (scale == 0)
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return 0;
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if (abs(scale) > 19)
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return -E2BIG;
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f = __pow10(abs(scale));
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if (scale > 0)
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*value *= f;
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else
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*value = div64_u64(*value, f);
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return 0;
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}
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2017-06-15 09:53:17 +00:00
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static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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int ret;
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u64 value;
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const struct scmi_sensor_info *sensor;
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struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
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const struct scmi_handle *h = scmi_sensors->handle;
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sensor = *(scmi_sensors->info[type] + channel);
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2019-07-08 08:40:57 +00:00
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ret = h->sensor_ops->reading_get(h, sensor->id, &value);
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2019-05-08 18:46:35 +00:00
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if (ret)
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return ret;
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ret = scmi_hwmon_scale(sensor, &value);
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2017-06-15 09:53:17 +00:00
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if (!ret)
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*val = value;
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return ret;
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}
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static int
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scmi_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, const char **str)
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{
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const struct scmi_sensor_info *sensor;
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struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
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sensor = *(scmi_sensors->info[type] + channel);
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*str = sensor->name;
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return 0;
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}
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static umode_t
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scmi_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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const struct scmi_sensor_info *sensor;
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const struct scmi_sensors *scmi_sensors = drvdata;
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sensor = *(scmi_sensors->info[type] + channel);
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2018-09-16 00:05:07 +00:00
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if (sensor)
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2018-12-10 22:02:19 +00:00
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return 0444;
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2017-06-15 09:53:17 +00:00
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return 0;
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}
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static const struct hwmon_ops scmi_hwmon_ops = {
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.is_visible = scmi_hwmon_is_visible,
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.read = scmi_hwmon_read,
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.read_string = scmi_hwmon_read_string,
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};
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static struct hwmon_chip_info scmi_chip_info = {
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.ops = &scmi_hwmon_ops,
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.info = NULL,
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};
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static int scmi_hwmon_add_chan_info(struct hwmon_channel_info *scmi_hwmon_chan,
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struct device *dev, int num,
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enum hwmon_sensor_types type, u32 config)
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{
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int i;
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u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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scmi_hwmon_chan->type = type;
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scmi_hwmon_chan->config = cfg;
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for (i = 0; i < num; i++, cfg++)
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*cfg = config;
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return 0;
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}
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static enum hwmon_sensor_types scmi_types[] = {
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[TEMPERATURE_C] = hwmon_temp,
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[VOLTAGE] = hwmon_in,
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[CURRENT] = hwmon_curr,
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[POWER] = hwmon_power,
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[ENERGY] = hwmon_energy,
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};
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static u32 hwmon_attributes[] = {
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[hwmon_chip] = HWMON_C_REGISTER_TZ,
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[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
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[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
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[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
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[hwmon_power] = HWMON_P_INPUT | HWMON_P_LABEL,
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[hwmon_energy] = HWMON_E_INPUT | HWMON_E_LABEL,
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};
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static int scmi_hwmon_probe(struct scmi_device *sdev)
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{
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int i, idx;
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u16 nr_sensors;
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enum hwmon_sensor_types type;
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struct scmi_sensors *scmi_sensors;
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const struct scmi_sensor_info *sensor;
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int nr_count[hwmon_max] = {0}, nr_types = 0;
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const struct hwmon_chip_info *chip_info;
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struct device *hwdev, *dev = &sdev->dev;
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struct hwmon_channel_info *scmi_hwmon_chan;
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const struct hwmon_channel_info **ptr_scmi_ci;
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const struct scmi_handle *handle = sdev->handle;
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if (!handle || !handle->sensor_ops)
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return -ENODEV;
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nr_sensors = handle->sensor_ops->count_get(handle);
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if (!nr_sensors)
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return -EIO;
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scmi_sensors = devm_kzalloc(dev, sizeof(*scmi_sensors), GFP_KERNEL);
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if (!scmi_sensors)
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return -ENOMEM;
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scmi_sensors->handle = handle;
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for (i = 0; i < nr_sensors; i++) {
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sensor = handle->sensor_ops->info_get(handle, i);
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if (!sensor)
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2018-03-15 16:54:18 +00:00
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return -EINVAL;
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2017-06-15 09:53:17 +00:00
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switch (sensor->type) {
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case TEMPERATURE_C:
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case VOLTAGE:
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case CURRENT:
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case POWER:
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case ENERGY:
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type = scmi_types[sensor->type];
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if (!nr_count[type])
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nr_types++;
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nr_count[type]++;
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break;
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}
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}
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if (nr_count[hwmon_temp])
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nr_count[hwmon_chip]++, nr_types++;
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scmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*scmi_hwmon_chan),
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GFP_KERNEL);
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if (!scmi_hwmon_chan)
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return -ENOMEM;
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ptr_scmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*ptr_scmi_ci),
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GFP_KERNEL);
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if (!ptr_scmi_ci)
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return -ENOMEM;
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scmi_chip_info.info = ptr_scmi_ci;
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chip_info = &scmi_chip_info;
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2018-04-06 15:30:47 +00:00
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for (type = 0; type < hwmon_max; type++) {
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if (!nr_count[type])
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continue;
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2017-06-15 09:53:17 +00:00
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scmi_hwmon_add_chan_info(scmi_hwmon_chan, dev, nr_count[type],
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type, hwmon_attributes[type]);
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*ptr_scmi_ci++ = scmi_hwmon_chan++;
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scmi_sensors->info[type] =
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devm_kcalloc(dev, nr_count[type],
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sizeof(*scmi_sensors->info), GFP_KERNEL);
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if (!scmi_sensors->info[type])
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return -ENOMEM;
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}
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for (i = nr_sensors - 1; i >= 0 ; i--) {
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sensor = handle->sensor_ops->info_get(handle, i);
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if (!sensor)
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continue;
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switch (sensor->type) {
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case TEMPERATURE_C:
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case VOLTAGE:
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case CURRENT:
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case POWER:
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case ENERGY:
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type = scmi_types[sensor->type];
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idx = --nr_count[type];
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*(scmi_sensors->info[type] + idx) = sensor;
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break;
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}
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}
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hwdev = devm_hwmon_device_register_with_info(dev, "scmi_sensors",
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scmi_sensors, chip_info,
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NULL);
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return PTR_ERR_OR_ZERO(hwdev);
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}
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static const struct scmi_device_id scmi_id_table[] = {
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2019-11-06 17:57:30 +00:00
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{ SCMI_PROTOCOL_SENSOR, "hwmon" },
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2017-06-15 09:53:17 +00:00
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{ },
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};
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MODULE_DEVICE_TABLE(scmi, scmi_id_table);
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static struct scmi_driver scmi_hwmon_drv = {
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.name = "scmi-hwmon",
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.probe = scmi_hwmon_probe,
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.id_table = scmi_id_table,
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};
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module_scmi_driver(scmi_hwmon_drv);
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MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
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MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
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MODULE_LICENSE("GPL v2");
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