mlxsw: core: Implement temperature hwmon interface
ASIC provides access to temperature sensors. Implement their exposure to userspace using hwmon. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
David S. Miller
parent
85926f8770
commit
89309da39f
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@ -10,6 +10,14 @@ config MLXSW_CORE
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To compile this driver as a module, choose M here: the
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module will be called mlxsw_core.
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config MLXSW_CORE_HWMON
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bool "HWMON support for Mellanox Technologies Switch ASICs"
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depends on MLXSW_CORE && HWMON
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depends on !(MLXSW_CORE=y && HWMON=m)
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default y
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---help---
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Say Y here if you want to expose HWMON interface on mlxsw devices.
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config MLXSW_PCI
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tristate "PCI bus implementation for Mellanox Technologies Switch ASICs"
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depends on PCI && HAS_DMA && HAS_IOMEM && MLXSW_CORE
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@ -1,5 +1,6 @@
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obj-$(CONFIG_MLXSW_CORE) += mlxsw_core.o
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mlxsw_core-objs := core.o
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mlxsw_core-$(CONFIG_MLXSW_CORE_HWMON) += core_hwmon.o
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obj-$(CONFIG_MLXSW_PCI) += mlxsw_pci.o
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mlxsw_pci-objs := pci.o
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obj-$(CONFIG_MLXSW_SWITCHX2) += mlxsw_switchx2.o
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@ -105,6 +105,7 @@ struct mlxsw_core {
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struct debugfs_blob_wrapper vsd_blob;
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struct debugfs_blob_wrapper psid_blob;
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} dbg;
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struct mlxsw_hwmon *hwmon;
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unsigned long driver_priv[0];
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/* driver_priv has to be always the last item */
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};
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@ -822,6 +823,10 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
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if (err)
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goto err_emad_init;
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err = mlxsw_hwmon_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->hwmon);
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if (err)
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goto err_hwmon_init;
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err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core,
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mlxsw_bus_info);
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if (err)
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@ -836,6 +841,8 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
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err_debugfs_init:
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mlxsw_core->driver->fini(mlxsw_core->driver_priv);
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err_driver_init:
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mlxsw_hwmon_fini(mlxsw_core->hwmon);
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err_hwmon_init:
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mlxsw_emad_fini(mlxsw_core);
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err_emad_init:
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mlxsw_bus->fini(bus_priv);
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@ -855,6 +862,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core)
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mlxsw_core_debugfs_fini(mlxsw_core);
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mlxsw_core->driver->fini(mlxsw_core->driver_priv);
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mlxsw_hwmon_fini(mlxsw_core->hwmon);
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mlxsw_emad_fini(mlxsw_core);
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mlxsw_core->bus->fini(mlxsw_core->bus_priv);
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free_percpu(mlxsw_core->pcpu_stats);
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@ -209,4 +209,28 @@ struct mlxsw_bus_info {
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u8 psid[MLXSW_CMD_BOARDINFO_PSID_LEN];
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};
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struct mlxsw_hwmon;
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#ifdef CONFIG_MLXSW_CORE_HWMON
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int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
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const struct mlxsw_bus_info *mlxsw_bus_info,
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struct mlxsw_hwmon **p_hwmon);
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void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon);
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#else
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static inline int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
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const struct mlxsw_bus_info *mlxsw_bus_info,
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struct mlxsw_hwmon **p_hwmon)
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{
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return 0;
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}
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static inline void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
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{
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}
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#endif
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#endif
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@ -0,0 +1,223 @@
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/*
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* drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
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* Copyright (c) 2015 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include "core.h"
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#define MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT 127
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#define MLXSW_HWMON_ATTR_COUNT (MLXSW_HWMON_TEMP_SENSOR_MAX_COUNT * 4)
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struct mlxsw_hwmon_attr {
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struct device_attribute dev_attr;
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struct mlxsw_hwmon *hwmon;
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unsigned int type_index;
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char name[16];
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};
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struct mlxsw_hwmon {
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struct mlxsw_core *core;
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const struct mlxsw_bus_info *bus_info;
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struct device *hwmon_dev;
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struct attribute_group group;
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const struct attribute_group *groups[2];
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struct attribute *attrs[MLXSW_HWMON_ATTR_COUNT + 1];
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struct mlxsw_hwmon_attr hwmon_attrs[MLXSW_HWMON_ATTR_COUNT];
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unsigned int attrs_count;
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};
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static ssize_t mlxsw_hwmon_temp_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
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container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
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struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
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char mtmp_pl[MLXSW_REG_MTMP_LEN];
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unsigned int temp;
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int err;
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mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_index,
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false, false);
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err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
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if (err) {
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dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
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return err;
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}
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mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
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return sprintf(buf, "%u\n", temp);
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}
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static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
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container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
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struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
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char mtmp_pl[MLXSW_REG_MTMP_LEN];
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unsigned int temp_max;
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int err;
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mlxsw_reg_mtmp_pack(mtmp_pl, mlwsw_hwmon_attr->type_index,
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false, false);
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err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
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if (err) {
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dev_err(mlxsw_hwmon->bus_info->dev, "Failed to query temp sensor\n");
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return err;
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}
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mlxsw_reg_mtmp_unpack(mtmp_pl, NULL, &temp_max, NULL);
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return sprintf(buf, "%u\n", temp_max);
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}
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enum mlxsw_hwmon_attr_type {
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MLXSW_HWMON_ATTR_TYPE_TEMP,
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MLXSW_HWMON_ATTR_TYPE_TEMP_MAX,
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};
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static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
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enum mlxsw_hwmon_attr_type attr_type,
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unsigned int type_index, unsigned int num) {
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struct mlxsw_hwmon_attr *mlxsw_hwmon_attr;
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unsigned int attr_index;
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attr_index = mlxsw_hwmon->attrs_count;
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mlxsw_hwmon_attr = &mlxsw_hwmon->hwmon_attrs[attr_index];
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switch (attr_type) {
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case MLXSW_HWMON_ATTR_TYPE_TEMP:
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mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_show;
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mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
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snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
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"temp%u_input", num + 1);
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break;
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case MLXSW_HWMON_ATTR_TYPE_TEMP_MAX:
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mlxsw_hwmon_attr->dev_attr.show = mlxsw_hwmon_temp_max_show;
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mlxsw_hwmon_attr->dev_attr.attr.mode = S_IRUGO;
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snprintf(mlxsw_hwmon_attr->name, sizeof(mlxsw_hwmon_attr->name),
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"temp%u_highest", num + 1);
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break;
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default:
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BUG();
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}
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mlxsw_hwmon_attr->type_index = type_index;
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mlxsw_hwmon_attr->hwmon = mlxsw_hwmon;
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mlxsw_hwmon_attr->dev_attr.attr.name = mlxsw_hwmon_attr->name;
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sysfs_attr_init(&mlxsw_hwmon_attr->dev_attr.attr);
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mlxsw_hwmon->attrs[attr_index] = &mlxsw_hwmon_attr->dev_attr.attr;
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mlxsw_hwmon->attrs_count++;
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}
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static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *mlxsw_hwmon)
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{
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char mtcap_pl[MLXSW_REG_MTCAP_LEN];
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char mtmp_pl[MLXSW_REG_MTMP_LEN];
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u8 sensor_count;
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int i;
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int err;
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err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtcap), mtcap_pl);
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if (err) {
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dev_err(mlxsw_hwmon->bus_info->dev, "Failed to get number of temp sensors\n");
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return err;
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}
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sensor_count = mlxsw_reg_mtcap_sensor_count_get(mtcap_pl);
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for (i = 0; i < sensor_count; i++) {
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mlxsw_reg_mtmp_pack(mtmp_pl, 0, true, true);
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err = mlxsw_reg_write(mlxsw_hwmon->core,
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MLXSW_REG(mtmp), mtmp_pl);
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if (err) {
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dev_err(mlxsw_hwmon->bus_info->dev, "Failed to setup temp sensor number %d\n",
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i);
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return err;
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}
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mlxsw_hwmon_attr_add(mlxsw_hwmon,
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MLXSW_HWMON_ATTR_TYPE_TEMP, i, i);
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mlxsw_hwmon_attr_add(mlxsw_hwmon,
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MLXSW_HWMON_ATTR_TYPE_TEMP_MAX, i, i);
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}
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return 0;
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}
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int mlxsw_hwmon_init(struct mlxsw_core *mlxsw_core,
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const struct mlxsw_bus_info *mlxsw_bus_info,
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struct mlxsw_hwmon **p_hwmon)
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{
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struct mlxsw_hwmon *mlxsw_hwmon;
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struct device *hwmon_dev;
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int err;
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mlxsw_hwmon = kzalloc(sizeof(*mlxsw_hwmon), GFP_KERNEL);
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if (!mlxsw_hwmon)
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return -ENOMEM;
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mlxsw_hwmon->core = mlxsw_core;
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mlxsw_hwmon->bus_info = mlxsw_bus_info;
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err = mlxsw_hwmon_temp_init(mlxsw_hwmon);
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if (err)
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goto err_temp_init;
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mlxsw_hwmon->groups[0] = &mlxsw_hwmon->group;
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mlxsw_hwmon->group.attrs = mlxsw_hwmon->attrs;
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hwmon_dev = devm_hwmon_device_register_with_groups(mlxsw_bus_info->dev,
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"mlxsw",
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mlxsw_hwmon,
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mlxsw_hwmon->groups);
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if (IS_ERR(hwmon_dev)) {
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err = PTR_ERR(hwmon_dev);
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goto err_hwmon_register;
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}
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mlxsw_hwmon->hwmon_dev = hwmon_dev;
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*p_hwmon = mlxsw_hwmon;
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return 0;
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err_hwmon_register:
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err_temp_init:
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kfree(mlxsw_hwmon);
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return err;
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}
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void mlxsw_hwmon_fini(struct mlxsw_hwmon *mlxsw_hwmon)
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{
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kfree(mlxsw_hwmon);
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}
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