mlxsw: core: Allow to reset temperature history via hwmon interface

Add another sysfs hwmon attribute to expose possibility to reset
temperature sensors history.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
index b86db96..00ccf1c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
@@ -49,7 +49,7 @@ struct mlxsw_hwmon_attr {
        struct device_attribute dev_attr;
        struct mlxsw_hwmon *hwmon;
        unsigned int type_index;
-       char name[16];
+       char name[32];
 };
 
 struct mlxsw_hwmon {
@@ -107,6 +107,32 @@ static ssize_t mlxsw_hwmon_temp_max_show(struct device *dev,
        return sprintf(buf, "%u\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 *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 err ? err : len;
+}
+
 static ssize_t mlxsw_hwmon_fan_rpm_show(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
@@ -175,6 +201,7 @@ static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
 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,
 };
@@ -201,6 +228,12 @@ static void mlxsw_hwmon_attr_add(struct mlxsw_hwmon *mlxsw_hwmon,
                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;
@@ -254,6 +287,8 @@ static int mlxsw_hwmon_temp_init(struct mlxsw_hwmon *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;
 }