/*
* 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)
struct mlxsw_hwmon_attr {
struct device_attribute dev_attr;
struct mlxsw_hwmon *hwmon;
unsigned int type_index;
char name[16];
};
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);
}
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);
}
enum mlxsw_hwmon_attr_type {
MLXSW_HWMON_ATTR_TYPE_TEMP,
MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
};
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;
default:
BUG();
}
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++;
}
static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon)
{
char mtcap_pl[MLXSW_REG_MTCAP_LEN];
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, 0, 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);
}
return 0;
}
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 = kzalloc(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;
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_temp_init:
kfree(mlxsw_hwmon);
return err;
}
void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
{
kfree(mlxsw_hwmon);
}
