// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023, Intel Corporation. */

#include "ice.h"
#include "ice_hwmon.h"
#include "ice_adminq_cmd.h"

#include <linux/hwmon.h>

#define TEMP_FROM_REG(reg) ((reg) * 1000)

static const struct hwmon_channel_info *ice_hwmon_info[] = {
        HWMON_CHANNEL_INFO(temp,
                           HWMON_T_INPUT | HWMON_T_MAX |
                           HWMON_T_CRIT | HWMON_T_EMERGENCY),
        NULL
};

static int ice_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
                          u32 attr, int channel, long *val)
{
        struct ice_aqc_get_sensor_reading_resp resp;
        struct ice_pf *pf = dev_get_drvdata(dev);
        int ret;

        if (type != hwmon_temp)
                return -EOPNOTSUPP;

        ret = ice_aq_get_sensor_reading(&pf->hw, &resp);
        if (ret) {
                dev_warn_ratelimited(dev,
                                     "%s HW read failure (%d)\n",
                                     __func__,
                                     ret);
                return ret;
        }

        switch (attr) {
        case hwmon_temp_input:
                *val = TEMP_FROM_REG(resp.data.s0f0.temp);
                break;
        case hwmon_temp_max:
                *val = TEMP_FROM_REG(resp.data.s0f0.temp_warning_threshold);
                break;
        case hwmon_temp_crit:
                *val = TEMP_FROM_REG(resp.data.s0f0.temp_critical_threshold);
                break;
        case hwmon_temp_emergency:
                *val = TEMP_FROM_REG(resp.data.s0f0.temp_fatal_threshold);
                break;
        default:
                dev_dbg(dev, "%s unsupported attribute (%d)\n",
                        __func__, attr);
                return -EOPNOTSUPP;
        }

        return 0;
}

static umode_t ice_hwmon_is_visible(const void *data,
                                    enum hwmon_sensor_types type, u32 attr,
                                    int channel)
{
        if (type != hwmon_temp)
                return 0;

        switch (attr) {
        case hwmon_temp_input:
        case hwmon_temp_crit:
        case hwmon_temp_max:
        case hwmon_temp_emergency:
                return 0444;
        }

        return 0;
}

static const struct hwmon_ops ice_hwmon_ops = {
        .is_visible = ice_hwmon_is_visible,
        .read = ice_hwmon_read
};

static const struct hwmon_chip_info ice_chip_info = {
        .ops = &ice_hwmon_ops,
        .info = ice_hwmon_info
};

static bool ice_is_internal_reading_supported(struct ice_pf *pf)
{
        /* Only the first PF will report temperature for a chip.
         * Note that internal temp reading is not supported
         * for older FW (< v4.30).
         */
        if (pf->hw.pf_id)
                return false;

        unsigned long sensors = pf->hw.dev_caps.supported_sensors;

        return test_bit(ICE_SENSOR_SUPPORT_E810_INT_TEMP_BIT, &sensors);
};

void ice_hwmon_init(struct ice_pf *pf)
{
        struct device *dev = ice_pf_to_dev(pf);
        struct device *hdev;

        if (!ice_is_internal_reading_supported(pf))
                return;

        hdev = hwmon_device_register_with_info(dev, "ice", pf, &ice_chip_info,
                                               NULL);
        if (IS_ERR(hdev)) {
                dev_warn(dev,
                         "hwmon_device_register_with_info returns error (%ld)",
                         PTR_ERR(hdev));
                return;
        }
        pf->hwmon_dev = hdev;
}

void ice_hwmon_exit(struct ice_pf *pf)
{
        if (!pf->hwmon_dev)
                return;
        hwmon_device_unregister(pf->hwmon_dev);
}