// 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;
}