linux/drivers/net/ethernet/intel/igb/igb_hwmon.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2018 Intel Corporation. */

#include "igb.h"
#include "e1000_82575.h"
#include "e1000_hw.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>
#include <linux/pci.h>

#ifdef CONFIG_IGB_HWMON
static struct i2c_board_info i350_sensor_info = {
	I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
};

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

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

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

	value = igb_attr->sensor->temp;

	/* display millidegree */
	value *= 1000;

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

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

	/* display millidegree */
	value *= 1000;

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

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

	/* display millidegree */
	value *= 1000;

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

/* igb_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 igb_add_hwmon_attr(struct igb_adapter *adapter,
			      unsigned int offset, int type)
{
	int rc;
	unsigned int n_attr;
	struct hwmon_attr *igb_attr;

	n_attr = adapter->igb_hwmon_buff->n_hwmon;
	igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];

	switch (type) {
	case IGB_HWMON_TYPE_LOC:
		igb_attr->dev_attr.show = igb_hwmon_show_location;
		snprintf(igb_attr->name, sizeof(igb_attr->name),
			 "temp%u_label", offset + 1);
		break;
	case IGB_HWMON_TYPE_TEMP:
		igb_attr->dev_attr.show = igb_hwmon_show_temp;
		snprintf(igb_attr->name, sizeof(igb_attr->name),
			 "temp%u_input", offset + 1);
		break;
	case IGB_HWMON_TYPE_CAUTION:
		igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
		snprintf(igb_attr->name, sizeof(igb_attr->name),
			 "temp%u_max", offset + 1);
		break;
	case IGB_HWMON_TYPE_MAX:
		igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
		snprintf(igb_attr->name, sizeof(igb_attr->name),
			 "temp%u_crit", offset + 1);
		break;
	default:
		rc = -EPERM;
		return rc;
	}

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

	adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;

	++adapter->igb_hwmon_buff->n_hwmon;

	return 0;
}

static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
{
}

/* called from igb_main.c */
void igb_sysfs_exit(struct igb_adapter *adapter)
{
	igb_sysfs_del_adapter(adapter);
}

/* called from igb_main.c */
int igb_sysfs_init(struct igb_adapter *adapter)
{
	struct hwmon_buff *igb_hwmon;
	struct i2c_client *client;
	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 */
	rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
	if (rc)
		goto exit;

	igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
				 GFP_KERNEL);
	if (!igb_hwmon) {
		rc = -ENOMEM;
		goto exit;
	}
	adapter->igb_hwmon_buff = igb_hwmon;

	for (i = 0; i < E1000_MAX_SENSORS; i++) {

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

		/* Bail if any hwmon attr struct fails to initialize */
		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
		if (rc)
			goto exit;
		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
		if (rc)
			goto exit;
		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
		if (rc)
			goto exit;
		rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
		if (rc)
			goto exit;
	}

	/* init i2c_client */
	client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
	if (client == NULL) {
		dev_info(&adapter->pdev->dev,
			 "Failed to create new i2c device.\n");
		rc = -ENODEV;
		goto exit;
	}
	adapter->i2c_client = client;

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

	hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
							   client->name,
							   igb_hwmon,
							   igb_hwmon->groups);
	if (IS_ERR(hwmon_dev)) {
		rc = PTR_ERR(hwmon_dev);
		goto err;
	}

	goto exit;

err:
	igb_sysfs_del_adapter(adapter);
exit:
	return rc;
}
#endif