drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

#include "ixgbe.h"
#include "ixgbe_common.h"
#include "ixgbe_type.h"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/hwmon.h>

/* hwmon callback functions */
static ssize_t ixgbe_hwmon_show_location(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
						     dev_attr);
	return sprintf(buf, "loc%u\n",
		       ixgbe_attr->sensor->location);
}

static ssize_t ixgbe_hwmon_show_temp(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
						     dev_attr);
	unsigned int value;

	/* reset the temp field */
	ixgbe_attr->hw->mac.ops.get_thermal_sensor_data(ixgbe_attr->hw);

	value = ixgbe_attr->sensor->temp;

	/* display millidegree */
	value *= 1000;

	return sprintf(buf, "%u\n", value);
}

static ssize_t ixgbe_hwmon_show_cautionthresh(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
						     dev_attr);
	unsigned int value = ixgbe_attr->sensor->caution_thresh;

	/* display millidegree */
	value *= 1000;

	return sprintf(buf, "%u\n", value);
}

static ssize_t ixgbe_hwmon_show_maxopthresh(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
						     dev_attr);
	unsigned int value = ixgbe_attr->sensor->max_op_thresh;

	/* display millidegree */
	value *= 1000;

	return sprintf(buf, "%u\n", value);
}

/**
 * ixgbe_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
 * @adapter: pointer to the adapter structure
 * @offset: offset in the eeprom sensor data table
 * @type: type of sensor data to display
 *
 * For each file we want in hwmon's sysfs interface we need a device_attribute
 * This is included in our hwmon_attr struct that contains the references to
 * the data structures we need to get the data to display.
 */
static int ixgbe_add_hwmon_attr(struct ixgbe_adapter *adapter,
				unsigned int offset, int type) {
	int rc;
	unsigned int n_attr;
	struct hwmon_attr *ixgbe_attr;

	n_attr = adapter->ixgbe_hwmon_buff->n_hwmon;
	ixgbe_attr = &adapter->ixgbe_hwmon_buff->hwmon_list[n_attr];

	switch (type) {
	case IXGBE_HWMON_TYPE_LOC:
		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_location;
		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
			 "temp%u_label", offset + 1);
		break;
	case IXGBE_HWMON_TYPE_TEMP:
		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_temp;
		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
			 "temp%u_input", offset + 1);
		break;
	case IXGBE_HWMON_TYPE_CAUTION:
		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_cautionthresh;
		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
			 "temp%u_max", offset + 1);
		break;
	case IXGBE_HWMON_TYPE_MAX:
		ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_maxopthresh;
		snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
			 "temp%u_crit", offset + 1);
		break;
	default:
		rc = -EPERM;
		return rc;
	}

	/* These always the same regardless of type */
	ixgbe_attr->sensor =
		&adapter->hw.mac.thermal_sensor_data.sensor[offset];
	ixgbe_attr->hw = &adapter->hw;
	ixgbe_attr->dev_attr.store = NULL;
	ixgbe_attr->dev_attr.attr.mode = 0444;
	ixgbe_attr->dev_attr.attr.name = ixgbe_attr->name;
	sysfs_attr_init(&ixgbe_attr->dev_attr.attr);

	adapter->ixgbe_hwmon_buff->attrs[n_attr] = &ixgbe_attr->dev_attr.attr;

	++adapter->ixgbe_hwmon_buff->n_hwmon;

	return 0;
}

static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter)
{
}

/* called from ixgbe_main.c */
void ixgbe_sysfs_exit(struct ixgbe_adapter *adapter)
{
	ixgbe_sysfs_del_adapter(adapter);
}

/* called from ixgbe_main.c */
int ixgbe_sysfs_init(struct ixgbe_adapter *adapter)
{
	struct hwmon_buff *ixgbe_hwmon;
	struct device *hwmon_dev;
	unsigned int i;
	int rc = 0;

	/* If this method isn't defined we don't support thermals */
	if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL) {
		goto exit;
	}

	/* Don't create thermal hwmon interface if no sensors present */
	if (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw))
		goto exit;

	ixgbe_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*ixgbe_hwmon),
				   GFP_KERNEL);
	if (ixgbe_hwmon == NULL) {
		rc = -ENOMEM;
		goto exit;
	}
	adapter->ixgbe_hwmon_buff = ixgbe_hwmon;

	for (i = 0; i < IXGBE_MAX_SENSORS; i++) {
		/*
		 * Only create hwmon sysfs entries for sensors that have
		 * meaningful data for.
		 */
		if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
			continue;

		/* Bail if any hwmon attr struct fails to initialize */
		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_CAUTION);
		if (rc)
			goto exit;
		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_LOC);
		if (rc)
			goto exit;
		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_TEMP);
		if (rc)
			goto exit;
		rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_MAX);
		if (rc)
			goto exit;
	}

	ixgbe_hwmon->groups[0] = &ixgbe_hwmon->group;
	ixgbe_hwmon->group.attrs = ixgbe_hwmon->attrs;

	hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
							   "ixgbe",
							   ixgbe_hwmon,
							   ixgbe_hwmon->groups);
	if (IS_ERR(hwmon_dev))
		rc = PTR_ERR(hwmon_dev);
exit:
	return rc;
}