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6a55331c87
SENSOR_DESCRIPTION_GET provides attributes to indicate if the sensor supports asynchronous read. Ideally we should be able to read that flag and use asynchronous reads for any sensors with that attribute set. In order to add that support, let's drop the async flag passed to sensor_ops->reading_get and dynamically switch between sync and async flags based on the attributes as provided by the firmware. Cc: linux-hwmon@vger.kernel.org Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
277 lines
6.0 KiB
C
277 lines
6.0 KiB
C
// 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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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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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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ret = h->sensor_ops->reading_get(h, sensor->id, &value);
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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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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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if (sensor)
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return 0444;
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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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return -EINVAL;
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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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for (type = 0; type < hwmon_max; type++) {
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if (!nr_count[type])
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continue;
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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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{ SCMI_PROTOCOL_SENSOR },
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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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