// SPDX-License-Identifier: GPL-2.0-only
/* Atlantic Network Driver
 *
 * Copyright (C) 2014-2019 aQuantia Corporation
 * Copyright (C) 2019-2020 Marvell International Ltd.
 */

/* File aq_drvinfo.c: Definition of common code for firmware info in sys.*/

#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/hwmon.h>
#include <linux/uaccess.h>

#include "aq_drvinfo.h"
#include "aq_nic.h"

#if IS_REACHABLE(CONFIG_HWMON)
static const char * const atl_temp_label[] = {
        "PHY Temperature",
        "MAC Temperature",
};

static int aq_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
                         u32 attr, int channel, long *value)
{
        struct aq_nic_s *aq_nic = dev_get_drvdata(dev);
        int err = 0;
        int temp;

        if (!aq_nic)
                return -EIO;

        if (type != hwmon_temp || attr != hwmon_temp_input)
                return -EOPNOTSUPP;

        switch (channel) {
        case 0:
                if (!aq_nic->aq_fw_ops->get_phy_temp)
                        return -EOPNOTSUPP;

                err = aq_nic->aq_fw_ops->get_phy_temp(aq_nic->aq_hw, &temp);
                *value = temp;
                break;
        case 1:
                if (!aq_nic->aq_fw_ops->get_mac_temp &&
                    !aq_nic->aq_hw_ops->hw_get_mac_temp)
                        return -EOPNOTSUPP;

                if (aq_nic->aq_fw_ops->get_mac_temp)
                        err = aq_nic->aq_fw_ops->get_mac_temp(aq_nic->aq_hw, &temp);
                else
                        err = aq_nic->aq_hw_ops->hw_get_mac_temp(aq_nic->aq_hw, &temp);
                *value = temp;
                break;
        default:
                return -EOPNOTSUPP;
        }

        return err;
}

static int aq_hwmon_read_string(struct device *dev,
                                enum hwmon_sensor_types type,
                                u32 attr, int channel, const char **str)
{
        struct aq_nic_s *aq_nic = dev_get_drvdata(dev);

        if (!aq_nic)
                return -EIO;

        if (type != hwmon_temp || attr != hwmon_temp_label)
                return -EOPNOTSUPP;

        if (channel < ARRAY_SIZE(atl_temp_label))
                *str = atl_temp_label[channel];
        else
                return -EOPNOTSUPP;

        return 0;
}

static umode_t aq_hwmon_is_visible(const void *data,
                                   enum hwmon_sensor_types type,
                                   u32 attr, int channel)
{
        const struct aq_nic_s *nic = data;

        if (type != hwmon_temp)
                return 0;

        if (channel == 0 && !nic->aq_fw_ops->get_phy_temp)
                return 0;
        else if (channel == 1 && !nic->aq_fw_ops->get_mac_temp &&
                 !nic->aq_hw_ops->hw_get_mac_temp)
                return 0;

        switch (attr) {
        case hwmon_temp_input:
        case hwmon_temp_label:
                return 0444;
        default:
                return 0;
        }
}

static const struct hwmon_ops aq_hwmon_ops = {
        .is_visible = aq_hwmon_is_visible,
        .read = aq_hwmon_read,
        .read_string = aq_hwmon_read_string,
};

static const struct hwmon_channel_info * const aq_hwmon_info[] = {
        HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL,
                           HWMON_T_INPUT | HWMON_T_LABEL),
        NULL,
};

static const struct hwmon_chip_info aq_hwmon_chip_info = {
        .ops = &aq_hwmon_ops,
        .info = aq_hwmon_info,
};

int aq_drvinfo_init(struct net_device *ndev)
{
        struct aq_nic_s *aq_nic = netdev_priv(ndev);
        struct device *dev = &aq_nic->pdev->dev;
        struct device *hwmon_dev;
        int err = 0;

        hwmon_dev = devm_hwmon_device_register_with_info(dev,
                                                         ndev->name,
                                                         aq_nic,
                                                         &aq_hwmon_chip_info,
                                                         NULL);

        if (IS_ERR(hwmon_dev))
                err = PTR_ERR(hwmon_dev);

        return err;
}

#else
int aq_drvinfo_init(struct net_device *ndev) { return 0; }
#endif