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Release 4.11 drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c

/*
 * drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
 * Copyright (c) 2015 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#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 "core.h"


#define MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT 127

#define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT * 4 + \
                                MLXSW_MFCR_TACHOS_MAX + MLXSW_MFCR_PWMS_MAX)


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


struct mlxsw_hwmon {
	
struct mlxsw_core *core;
	
const struct mlxsw_bus_info *bus_info;
	
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;
};


static ssize_t mlxsw_hwmon_temp_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mlxsw_hwmon_attr *mlwsw_hwmon_attr = container_of(attr, struct mlxsw_hwmon_attr, dev_attr); struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon; char mtmp_pl[MLXSW_REG_MTMP_LEN]; unsigned int temp; int err; mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_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); return sprintf(buf, "%u\n", temp); }

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static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mlxsw_hwmon_attr *mlwsw_hwmon_attr = container_of(attr, struct mlxsw_hwmon_attr, dev_attr); struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon; char mtmp_pl[MLXSW_REG_MTMP_LEN]; unsigned int temp_max; int err; mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_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); return sprintf(buf, "%u\n", temp_max); }

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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 *mlwsw_hwmon_attr = container_of(attr, struct mlxsw_hwmon_attr, dev_attr); struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon; char mtmp_pl[MLXSW_REG_MTMP_LEN]; unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err) return err; if (val != 1) return -EINVAL; mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_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 reset temp sensor history\n"); return err; } return len; }

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

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

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static ssize_t mlxsw_hwmon_pwm_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct mlxsw_hwmon_attr *mlwsw_hwmon_attr = container_of(attr, struct mlxsw_hwmon_attr, dev_attr); struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->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, mlwsw_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; }

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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_PWM, };
static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon, 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->attrs_count; mlxsw_hwmon_attr = &mlxsw_hwmon->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 = S_IRUGO; 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 = S_IRUGO; 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 = S_IWUSR; 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 = S_IRUGO; snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name), "fan%u_input", 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 = S_IWUSR | S_IRUGO; snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name), "pwm%u", num + 1); break; default: WARN_ON(1); } mlxsw_hwmon_attr->type_index = type_index; mlxsw_hwmon_attr->hwmon = mlxsw_hwmon; mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name; sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr); mlxsw_hwmon->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr; mlxsw_hwmon->attrs_count++; }

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static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon) { char mtcap_pl[MLXSW_REG_MTCAP_LEN] = {0}; char mtmp_pl[MLXSW_REG_MTMP_LEN]; u8 sensor_count; 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; } sensor_count = mlxsw_reg_mtcap_sensor_count_get(mtcap_pl); for (i = 0; i < sensor_count; i++) { mlxsw_reg_mtmp_pack(mtmp_pl, i, 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", i); return err; } mlxsw_hwmon_attr_add(mlxsw_hwmon, MLXSW_HWMON_ATTR_TYPE_TEMP, i, i); mlxsw_hwmon_attr_add(mlxsw_hwmon, MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, i, i); mlxsw_hwmon_attr_add(mlxsw_hwmon, MLXSW_HWMON_ATTR_TYPE_TEMP_RST, i, i); } return 0; }

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static int mlxsw_hwmon_fans_init(struct mlxsw_hwmon *mlxsw_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, MLXSW_HWMON_ATTR_TYPE_FAN_RPM, 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, MLXSW_HWMON_ATTR_TYPE_PWM, type_index, num++); } return 0; }

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int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core, const struct mlxsw_bus_info *mlxsw_bus_info, struct mlxsw_hwmon **p_hwmon) { struct mlxsw_hwmon *mlxsw_hwmon; struct device *hwmon_dev; int err; mlxsw_hwmon = devm_kzalloc(mlxsw_bus_info->dev, sizeof(*mlxsw_hwmon), GFP_KERNEL); if (!mlxsw_hwmon) return -ENOMEM; mlxsw_hwmon->core = mlxsw_core; mlxsw_hwmon->bus_info = mlxsw_bus_info; err = mlxsw_hwmon_temp_init(mlxsw_hwmon); if (err) goto err_temp_init; err = mlxsw_hwmon_fans_init(mlxsw_hwmon); if (err) goto err_fans_init; mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group; mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs; hwmon_dev = devm_hwmon_device_register_with_groups(mlxsw_bus_info->dev, "mlxsw", mlxsw_hwmon, mlxsw_hwmon->groups); if (IS_ERR(hwmon_dev)) { err = PTR_ERR(hwmon_dev); goto err_hwmon_register; } mlxsw_hwmon->hwmon_dev = hwmon_dev; *p_hwmon = mlxsw_hwmon; return 0; err_hwmon_register: err_fans_init: err_temp_init: return err; }

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