// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2015-2018 Mellanox Technologies. All rights reserved */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/sfp.h>

#include "core.h"
#include "core_env.h"

#define MLXSW_HWMON_SENSORS_MAX_COUNT 64
#define MLXSW_HWMON_MODULES_MAX_COUNT 64
#define MLXSW_HWMON_GEARBOXES_MAX_COUNT 32

#define MLXSW_HWMON_ATTR_PER_SENSOR 3
#define MLXSW_HWMON_ATTR_PER_MODULE 7
#define MLXSW_HWMON_ATTR_PER_GEARBOX 4
#define MLXSW_HWMON_DEV_NAME_LEN_MAX 16

#define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_SENSORS_MAX_COUNT * MLXSW_HWMON_ATTR_PER_SENSOR + \
                                MLXSW_HWMON_MODULES_MAX_COUNT * MLXSW_HWMON_ATTR_PER_MODULE + \
                                MLXSW_HWMON_GEARBOXES_MAX_COUNT * MLXSW_HWMON_ATTR_PER_GEARBOX + \
                                MLXSW_MFCR_TACHOS_MAX + MLXSW_MFCR_PWMS_MAX)

struct mlxsw_hwmon_attr {
        struct device_attribute dev_attr;
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev;
        unsigned int type_index;
        char name[32];
};

static int mlxsw_hwmon_get_attr_index(int index, int count)
{
        if (index >= count)
                return index % count + MLXSW_REG_MTMP_GBOX_INDEX_MIN;

        return index;
}

struct mlxsw_hwmon_dev {
        char name[MLXSW_HWMON_DEV_NAME_LEN_MAX];
        struct mlxsw_hwmon *hwmon;
        struct device *hwmon_dev;
        struct attribute_group group;
        const struct attribute_group *groups[2];
        struct attribute *attrs[MLXSW_HWMON_ATTR_COUNT + 1];
        struct mlxsw_hwmon_attr hwmon_attrs[MLXSW_HWMON_ATTR_COUNT];
        unsigned int attrs_count;
        u8 sensor_count;
        u8 module_sensor_max;
        u8 slot_index;
        bool active;
};

struct mlxsw_hwmon {
        struct mlxsw_core *core;
        const struct mlxsw_bus_info *bus_info;
        struct mlxsw_hwmon_dev line_cards[];
};

static ssize_t mlxsw_hwmon_temp_show(struct device *dev,
                                     struct device_attribute *attr,
                                     char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtmp_pl[MLXSW_REG_MTMP_LEN];
        int temp, index;
        int err;

        index = mlxsw_hwmon_get_attr_index(mlxsw_hwmon_attr->type_index,
                                           mlxsw_hwmon_dev->module_sensor_max);
        mlxsw_reg_mtmp_pack(mtmp_pl, mlxsw_hwmon_dev->slot_index, index, false,
                            false);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
                return err;
        }
        mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL, NULL, NULL);
        return sprintf(buf, "%d\n", temp);
}

static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev,
                                         struct device_attribute *attr,
                                         char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtmp_pl[MLXSW_REG_MTMP_LEN];
        int temp_max, index;
        int err;

        index = mlxsw_hwmon_get_attr_index(mlxsw_hwmon_attr->type_index,
                                           mlxsw_hwmon_dev->module_sensor_max);
        mlxsw_reg_mtmp_pack(mtmp_pl, mlxsw_hwmon_dev->slot_index, index, false,
                            false);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
                return err;
        }
        mlxsw_reg_mtmp_unpack(mtmp_pl, NULL, &temp_max, NULL, NULL, NULL);
        return sprintf(buf, "%d\n", temp_max);
}

static ssize_t mlxsw_hwmon_temp_rst_store(struct device *dev,
                                          struct device_attribute *attr,
                                          const char *buf, size_t len)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtmp_pl[MLXSW_REG_MTMP_LEN];
        unsigned long val;
        int index;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err)
                return err;
        if (val != 1)
                return -EINVAL;

        index = mlxsw_hwmon_get_attr_index(mlxsw_hwmon_attr->type_index,
                                           mlxsw_hwmon_dev->module_sensor_max);

        mlxsw_reg_mtmp_slot_index_set(mtmp_pl, mlxsw_hwmon_dev->slot_index);
        mlxsw_reg_mtmp_sensor_index_set(mtmp_pl, index);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
        if (err)
                return err;
        mlxsw_reg_mtmp_mte_set(mtmp_pl, true);
        mlxsw_reg_mtmp_mtr_set(mtmp_pl, true);
        err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to reset temp sensor history\n");
                return err;
        }
        return len;
}

static ssize_t mlxsw_hwmon_fan_rpm_show(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mfsm_pl[MLXSW_REG_MFSM_LEN];
        int err;

        mlxsw_reg_mfsm_pack(mfsm_pl, mlxsw_hwmon_attr->type_index);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsm), mfsm_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query fan\n");
                return err;
        }
        return sprintf(buf, "%u\n", mlxsw_reg_mfsm_rpm_get(mfsm_pl));
}

static ssize_t mlxsw_hwmon_fan_fault_show(struct device *dev,
                                          struct device_attribute *attr,
                                          char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char fore_pl[MLXSW_REG_FORE_LEN];
        bool fault;
        int err;

        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(fore), fore_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query fan\n");
                return err;
        }
        mlxsw_reg_fore_unpack(fore_pl, mlxsw_hwmon_attr->type_index, &fault);

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

static ssize_t mlxsw_hwmon_pwm_show(struct device *dev,
                                    struct device_attribute *attr,
                                    char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mfsc_pl[MLXSW_REG_MFSC_LEN];
        int err;

        mlxsw_reg_mfsc_pack(mfsc_pl, mlxsw_hwmon_attr->type_index, 0);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query PWM\n");
                return err;
        }
        return sprintf(buf, "%u\n",
                       mlxsw_reg_mfsc_pwm_duty_cycle_get(mfsc_pl));
}

static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
                                     struct device_attribute *attr,
                                     const char *buf, size_t len)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mfsc_pl[MLXSW_REG_MFSC_LEN];
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err)
                return err;
        if (val > 255)
                return -EINVAL;

        mlxsw_reg_mfsc_pack(mfsc_pl, mlxsw_hwmon_attr->type_index, val);
        err = mlxsw_reg_write(mlxsw_hwmon->core, MLXSW_REG(mfsc), mfsc_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to write PWM\n");
                return err;
        }
        return len;
}

static int mlxsw_hwmon_module_temp_get(struct device *dev,
                                       struct device_attribute *attr,
                                       int *p_temp)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtmp_pl[MLXSW_REG_MTMP_LEN];
        u8 module;
        int err;

        module = mlxsw_hwmon_attr->type_index - mlxsw_hwmon_dev->sensor_count;
        mlxsw_reg_mtmp_pack(mtmp_pl, mlxsw_hwmon_dev->slot_index,
                            MLXSW_REG_MTMP_MODULE_INDEX_MIN + module, false,
                            false);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
        if (err) {
                dev_err(dev, "Failed to query module temperature\n");
                return err;
        }
        mlxsw_reg_mtmp_unpack(mtmp_pl, p_temp, NULL, NULL, NULL, NULL);

        return 0;
}

static ssize_t mlxsw_hwmon_module_temp_show(struct device *dev,
                                            struct device_attribute *attr,
                                            char *buf)
{
        int err, temp;

        err = mlxsw_hwmon_module_temp_get(dev, attr, &temp);
        if (err)
                return err;

        return sprintf(buf, "%d\n", temp);
}

static ssize_t mlxsw_hwmon_module_temp_fault_show(struct device *dev,
                                                  struct device_attribute *attr,
                                                  char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtbr_pl[MLXSW_REG_MTBR_LEN] = {0};
        u8 module, fault;
        u16 temp;
        int err;

        module = mlxsw_hwmon_attr->type_index - mlxsw_hwmon_dev->sensor_count;
        mlxsw_reg_mtbr_pack(mtbr_pl, mlxsw_hwmon_dev->slot_index,
                            MLXSW_REG_MTBR_BASE_MODULE_INDEX + module);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtbr), mtbr_pl);
        if (err) {
                dev_err(dev, "Failed to query module temperature sensor\n");
                return err;
        }

        mlxsw_reg_mtbr_temp_unpack(mtbr_pl, 0, &temp, NULL);

        /* Update status and temperature cache. */
        switch (temp) {
        case MLXSW_REG_MTBR_BAD_SENS_INFO:
                /* Untrusted cable is connected. Reading temperature from its
                 * sensor is faulty.
                 */
                fault = 1;
                break;
        case MLXSW_REG_MTBR_NO_CONN:
        case MLXSW_REG_MTBR_NO_TEMP_SENS:
        case MLXSW_REG_MTBR_INDEX_NA:
        default:
                fault = 0;
                break;
        }

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

static int mlxsw_hwmon_module_temp_critical_get(struct device *dev,
                                                struct device_attribute *attr,
                                                int *p_temp)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        u8 module;
        int err;

        module = mlxsw_hwmon_attr->type_index - mlxsw_hwmon_dev->sensor_count;
        err = mlxsw_env_module_temp_thresholds_get(mlxsw_hwmon->core,
                                                   mlxsw_hwmon_dev->slot_index,
                                                   module, SFP_TEMP_HIGH_WARN,
                                                   p_temp);
        if (err) {
                dev_err(dev, "Failed to query module temperature thresholds\n");
                return err;
        }

        return 0;
}

static ssize_t
mlxsw_hwmon_module_temp_critical_show(struct device *dev,
                                      struct device_attribute *attr, char *buf)
{
        int err, temp;

        err = mlxsw_hwmon_module_temp_critical_get(dev, attr, &temp);
        if (err)
                return err;

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

static int mlxsw_hwmon_module_temp_emergency_get(struct device *dev,
                                                 struct device_attribute *attr,
                                                 int *p_temp)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        u8 module;
        int err;

        module = mlxsw_hwmon_attr->type_index - mlxsw_hwmon_dev->sensor_count;
        err = mlxsw_env_module_temp_thresholds_get(mlxsw_hwmon->core,
                                                   mlxsw_hwmon_dev->slot_index,
                                                   module, SFP_TEMP_HIGH_ALARM,
                                                   p_temp);
        if (err) {
                dev_err(dev, "Failed to query module temperature thresholds\n");
                return err;
        }

        return 0;
}

static ssize_t
mlxsw_hwmon_module_temp_emergency_show(struct device *dev,
                                       struct device_attribute *attr,
                                       char *buf)
{
        int err, temp;

        err = mlxsw_hwmon_module_temp_emergency_get(dev, attr, &temp);
        if (err)
                return err;

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

static ssize_t
mlxsw_hwmon_module_temp_label_show(struct device *dev,
                                   struct device_attribute *attr,
                                   char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);

        return sprintf(buf, "front panel %03u\n",
                       mlxsw_hwmon_attr->type_index + 1 -
                       mlxsw_hwmon_attr->mlxsw_hwmon_dev->sensor_count);
}

static ssize_t
mlxsw_hwmon_gbox_temp_label_show(struct device *dev,
                                 struct device_attribute *attr,
                                 char *buf)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr =
                        container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
        struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
        int index = mlxsw_hwmon_attr->type_index -
                    mlxsw_hwmon_dev->module_sensor_max + 1;

        return sprintf(buf, "gearbox %03u\n", index);
}

static ssize_t mlxsw_hwmon_temp_critical_alarm_show(struct device *dev,
                                                    struct device_attribute *attr,
                                                    char *buf)
{
        int err, temp, emergency_temp, critic_temp;

        err = mlxsw_hwmon_module_temp_get(dev, attr, &temp);
        if (err)
                return err;

        if (temp <= 0)
                return sprintf(buf, "%d\n", false);

        err = mlxsw_hwmon_module_temp_emergency_get(dev, attr, &emergency_temp);
        if (err)
                return err;

        if (temp >= emergency_temp)
                return sprintf(buf, "%d\n", false);

        err = mlxsw_hwmon_module_temp_critical_get(dev, attr, &critic_temp);
        if (err)
                return err;

        return sprintf(buf, "%d\n", temp >= critic_temp);
}

static ssize_t mlxsw_hwmon_temp_emergency_alarm_show(struct device *dev,
                                                     struct device_attribute *attr,
                                                     char *buf)
{
        int err, temp, emergency_temp;

        err = mlxsw_hwmon_module_temp_get(dev, attr, &temp);
        if (err)
                return err;

        if (temp <= 0)
                return sprintf(buf, "%d\n", false);

        err = mlxsw_hwmon_module_temp_emergency_get(dev, attr, &emergency_temp);
        if (err)
                return err;

        return sprintf(buf, "%d\n", temp >= emergency_temp);
}

enum mlxsw_hwmon_attr_type {
        MLXSW_HWMON_ATTR_TYPE_TEMP,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
        MLXSW_HWMON_ATTR_TYPE_TEMP_RST,
        MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
        MLXSW_HWMON_ATTR_TYPE_FAN_FAULT,
        MLXSW_HWMON_ATTR_TYPE_PWM,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_FAULT,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_CRIT,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_EMERG,
        MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_LABEL,
        MLXSW_HWMON_ATTR_TYPE_TEMP_GBOX_LABEL,
        MLXSW_HWMON_ATTR_TYPE_TEMP_CRIT_ALARM,
        MLXSW_HWMON_ATTR_TYPE_TEMP_EMERGENCY_ALARM,
};

static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev,
                                 enum mlxsw_hwmon_attr_type attr_type,
                                 unsigned int type_index, unsigned int num)
{
        struct mlxsw_hwmon_attr *mlxsw_hwmon_attr;
        unsigned int attr_index;

        attr_index = mlxsw_hwmon_dev->attrs_count;
        mlxsw_hwmon_attr = &mlxsw_hwmon_dev->hwmon_attrs[attr_index];

        switch (attr_type) {
        case MLXSW_HWMON_ATTR_TYPE_TEMP:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_input", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MAX:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_max_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_highest", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_RST:
                mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_temp_rst_store;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0200;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_reset_history", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_FAN_RPM:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_fan_rpm_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "fan%u_input", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_FAN_FAULT:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_fan_fault_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "fan%u_fault", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_PWM:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_pwm_show;
                mlxsw_hwmon_attr->dev_attr.store = mlxsw_hwmon_pwm_store;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0644;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "pwm%u", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE:
                mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_module_temp_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_input", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_FAULT:
                mlxsw_hwmon_attr->dev_attr.show =
                                        mlxsw_hwmon_module_temp_fault_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_fault", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_CRIT:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_module_temp_critical_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_crit", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_EMERG:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_module_temp_emergency_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_emergency", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_LABEL:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_module_temp_label_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_label", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_GBOX_LABEL:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_gbox_temp_label_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_label", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_CRIT_ALARM:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_temp_critical_alarm_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_crit_alarm", num + 1);
                break;
        case MLXSW_HWMON_ATTR_TYPE_TEMP_EMERGENCY_ALARM:
                mlxsw_hwmon_attr->dev_attr.show =
                        mlxsw_hwmon_temp_emergency_alarm_show;
                mlxsw_hwmon_attr->dev_attr.attr.mode = 0444;
                snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
                         "temp%u_emergency_alarm", num + 1);
                break;
        default:
                WARN_ON(1);
        }

        mlxsw_hwmon_attr->type_index = type_index;
        mlxsw_hwmon_attr->mlxsw_hwmon_dev = mlxsw_hwmon_dev;
        mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name;
        sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr);

        mlxsw_hwmon_dev->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr;
        mlxsw_hwmon_dev->attrs_count++;
}

static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev)
{
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mtcap_pl[MLXSW_REG_MTCAP_LEN] = {0};
        int i;
        int err;

        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtcap), mtcap_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get number of temp sensors\n");
                return err;
        }
        mlxsw_hwmon_dev->sensor_count = mlxsw_reg_mtcap_sensor_count_get(mtcap_pl);
        for (i = 0; i < mlxsw_hwmon_dev->sensor_count; i++) {
                char mtmp_pl[MLXSW_REG_MTMP_LEN] = {0};

                mlxsw_reg_mtmp_slot_index_set(mtmp_pl,
                                              mlxsw_hwmon_dev->slot_index);
                mlxsw_reg_mtmp_sensor_index_set(mtmp_pl, i);
                err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp),
                                      mtmp_pl);
                if (err)
                        return err;
                mlxsw_reg_mtmp_mte_set(mtmp_pl, true);
                mlxsw_reg_mtmp_mtr_set(mtmp_pl, true);
                err = mlxsw_reg_write(mlxsw_hwmon->core,
                                      MLXSW_REG(mtmp), mtmp_pl);
                if (err) {
                        dev_err(mlxsw_hwmon->bus_info->dev, "Failed to setup temp sensor number %d\n",
                                i);
                        return err;
                }
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP, i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_RST, i, i);
        }
        return 0;
}

static int mlxsw_hwmon_fans_init(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev)
{
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mfcr_pl[MLXSW_REG_MFCR_LEN] = {0};
        enum mlxsw_reg_mfcr_pwm_frequency freq;
        unsigned int type_index;
        unsigned int num;
        u16 tacho_active;
        u8 pwm_active;
        int err;

        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mfcr), mfcr_pl);
        if (err) {
                dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get to probe PWMs and Tachometers\n");
                return err;
        }
        mlxsw_reg_mfcr_unpack(mfcr_pl, &freq, &tacho_active, &pwm_active);
        num = 0;
        for (type_index = 0; type_index < MLXSW_MFCR_TACHOS_MAX; type_index++) {
                if (tacho_active & BIT(type_index)) {
                        mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                             MLXSW_HWMON_ATTR_TYPE_FAN_RPM,
                                             type_index, num);
                        mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                             MLXSW_HWMON_ATTR_TYPE_FAN_FAULT,
                                             type_index, num++);
                }
        }
        num = 0;
        for (type_index = 0; type_index < MLXSW_MFCR_PWMS_MAX; type_index++) {
                if (pwm_active & BIT(type_index))
                        mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                             MLXSW_HWMON_ATTR_TYPE_PWM,
                                             type_index, num++);
        }
        return 0;
}

static int mlxsw_hwmon_module_init(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev)
{
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        char mgpir_pl[MLXSW_REG_MGPIR_LEN];
        u8 module_sensor_max;
        int i, err;

        mlxsw_reg_mgpir_pack(mgpir_pl, mlxsw_hwmon_dev->slot_index);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mgpir), mgpir_pl);
        if (err)
                return err;

        mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL,
                               &module_sensor_max, NULL);

        /* Add extra attributes for module temperature. Sensor index is
         * assigned to sensor_count value, while all indexed before
         * sensor_count are already utilized by the sensors connected through
         * mtmp register by mlxsw_hwmon_temp_init().
         */
        mlxsw_hwmon_dev->module_sensor_max = mlxsw_hwmon_dev->sensor_count +
                                             module_sensor_max;
        for (i = mlxsw_hwmon_dev->sensor_count;
             i < mlxsw_hwmon_dev->module_sensor_max; i++) {
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE, i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_FAULT,
                                     i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_CRIT, i,
                                     i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_EMERG,
                                     i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MODULE_LABEL,
                                     i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_CRIT_ALARM,
                                     i, i);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_EMERGENCY_ALARM,
                                     i, i);
        }

        return 0;
}

static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon_dev *mlxsw_hwmon_dev)
{
        struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
        enum mlxsw_reg_mgpir_device_type device_type;
        int index, max_index, sensor_index;
        char mgpir_pl[MLXSW_REG_MGPIR_LEN];
        char mtmp_pl[MLXSW_REG_MTMP_LEN];
        u8 gbox_num;
        int err;

        mlxsw_reg_mgpir_pack(mgpir_pl, mlxsw_hwmon_dev->slot_index);
        err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mgpir), mgpir_pl);
        if (err)
                return err;

        mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL, NULL,
                               NULL);
        if (device_type != MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE ||
            !gbox_num)
                return 0;

        index = mlxsw_hwmon_dev->module_sensor_max;
        max_index = mlxsw_hwmon_dev->module_sensor_max + gbox_num;
        while (index < max_index) {
                sensor_index = index % mlxsw_hwmon_dev->module_sensor_max +
                               MLXSW_REG_MTMP_GBOX_INDEX_MIN;
                mlxsw_reg_mtmp_pack(mtmp_pl, mlxsw_hwmon_dev->slot_index,
                                    sensor_index, true, true);
                err = mlxsw_reg_write(mlxsw_hwmon->core,
                                      MLXSW_REG(mtmp), mtmp_pl);
                if (err) {
                        dev_err(mlxsw_hwmon->bus_info->dev, "Failed to setup temp sensor number %d\n",
                                sensor_index);
                        return err;
                }
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP, index, index);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, index,
                                     index);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_RST, index,
                                     index);
                mlxsw_hwmon_attr_add(mlxsw_hwmon_dev,
                                     MLXSW_HWMON_ATTR_TYPE_TEMP_GBOX_LABEL,
                                     index, index);
                index++;
        }

        return 0;
}

static void
mlxsw_hwmon_got_active(struct mlxsw_core *mlxsw_core, u8 slot_index,
                       void *priv)
{
        struct mlxsw_hwmon *hwmon = priv;
        struct mlxsw_hwmon_dev *linecard;
        struct device *dev;
        int err;

        dev = hwmon->bus_info->dev;
        linecard = &hwmon->line_cards[slot_index];
        if (linecard->active)
                return;
        /* For the main board, module sensor indexes start from 1, sensor index
         * 0 is used for the ASIC. Use the same numbering for line cards.
         */
        linecard->sensor_count = 1;
        linecard->slot_index = slot_index;
        linecard->hwmon = hwmon;
        err = mlxsw_hwmon_module_init(linecard);
        if (err) {
                dev_err(dev, "Failed to configure hwmon objects for line card modules in slot %d\n",
                        slot_index);
                return;
        }

        err = mlxsw_hwmon_gearbox_init(linecard);
        if (err) {
                dev_err(dev, "Failed to configure hwmon objects for line card gearboxes in slot %d\n",
                        slot_index);
                return;
        }

        linecard->groups[0] = &linecard->group;
        linecard->group.attrs = linecard->attrs;
        sprintf(linecard->name, "%s#%02u", "linecard", slot_index);
        linecard->hwmon_dev =
                hwmon_device_register_with_groups(dev, linecard->name,
                                                  linecard, linecard->groups);
        if (IS_ERR(linecard->hwmon_dev)) {
                dev_err(dev, "Failed to register hwmon objects for line card in slot %d\n",
                        slot_index);
                return;
        }

        linecard->active = true;
}

static void
mlxsw_hwmon_got_inactive(struct mlxsw_core *mlxsw_core, u8 slot_index,
                         void *priv)
{
        struct mlxsw_hwmon *hwmon = priv;
        struct mlxsw_hwmon_dev *linecard;

        linecard = &hwmon->line_cards[slot_index];
        if (!linecard->active)
                return;
        linecard->active = false;
        hwmon_device_unregister(linecard->hwmon_dev);
        /* Reset attributes counter */
        linecard->attrs_count = 0;
}

static struct mlxsw_linecards_event_ops mlxsw_hwmon_event_ops = {
        .got_active = mlxsw_hwmon_got_active,
        .got_inactive = mlxsw_hwmon_got_inactive,
};

int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
                     const struct mlxsw_bus_info *mlxsw_bus_info,
                     struct mlxsw_hwmon **p_hwmon)
{
        char mgpir_pl[MLXSW_REG_MGPIR_LEN];
        struct mlxsw_hwmon *mlxsw_hwmon;
        struct device *hwmon_dev;
        u8 num_of_slots;
        int err;

        mlxsw_reg_mgpir_pack(mgpir_pl, 0);
        err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgpir), mgpir_pl);
        if (err)
                return err;

        mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL, NULL,
                               &num_of_slots);

        mlxsw_hwmon = kzalloc_flex(*mlxsw_hwmon, line_cards, num_of_slots + 1);
        if (!mlxsw_hwmon)
                return -ENOMEM;

        mlxsw_hwmon->core = mlxsw_core;
        mlxsw_hwmon->bus_info = mlxsw_bus_info;
        mlxsw_hwmon->line_cards[0].hwmon = mlxsw_hwmon;
        mlxsw_hwmon->line_cards[0].slot_index = 0;

        err = mlxsw_hwmon_temp_init(&mlxsw_hwmon->line_cards[0]);
        if (err)
                goto err_temp_init;

        err = mlxsw_hwmon_fans_init(&mlxsw_hwmon->line_cards[0]);
        if (err)
                goto err_fans_init;

        err = mlxsw_hwmon_module_init(&mlxsw_hwmon->line_cards[0]);
        if (err)
                goto err_temp_module_init;

        err = mlxsw_hwmon_gearbox_init(&mlxsw_hwmon->line_cards[0]);
        if (err)
                goto err_temp_gearbox_init;

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

        hwmon_dev = hwmon_device_register_with_groups(mlxsw_bus_info->dev,
                                                      "mlxsw",
                                                      &mlxsw_hwmon->line_cards[0],
                                                      mlxsw_hwmon->line_cards[0].groups);
        if (IS_ERR(hwmon_dev)) {
                err = PTR_ERR(hwmon_dev);
                goto err_hwmon_register;
        }

        err = mlxsw_linecards_event_ops_register(mlxsw_hwmon->core,
                                                 &mlxsw_hwmon_event_ops,
                                                 mlxsw_hwmon);
        if (err)
                goto err_linecards_event_ops_register;

        mlxsw_hwmon->line_cards[0].hwmon_dev = hwmon_dev;
        mlxsw_hwmon->line_cards[0].active = true;
        *p_hwmon = mlxsw_hwmon;
        return 0;

err_linecards_event_ops_register:
        hwmon_device_unregister(mlxsw_hwmon->line_cards[0].hwmon_dev);
err_hwmon_register:
err_temp_gearbox_init:
err_temp_module_init:
err_fans_init:
err_temp_init:
        kfree(mlxsw_hwmon);
        return err;
}

void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
{
        mlxsw_hwmon->line_cards[0].active = false;
        mlxsw_linecards_event_ops_unregister(mlxsw_hwmon->core,
                                             &mlxsw_hwmon_event_ops, mlxsw_hwmon);
        hwmon_device_unregister(mlxsw_hwmon->line_cards[0].hwmon_dev);
        kfree(mlxsw_hwmon);
}