In P9, OCC allows for clearing the sensor min-max history. This patch exports attribute to reset history when set will clear the history of all the sensors owned by CSM and belonging to the chip.
Signed-off-by: Shilpasri G Bhat <shilpa.b...@linux.vnet.ibm.com> --- This patch is on top of this patchset: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1453891.html This patch creates a non-standard attribute called as reset_historyX which clears the lowest and highest of all the sensors like power, temperature, voltage belonging to the chip. drivers/hwmon/ibmpowernv.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c index 5ccdd0b..611e472 100644 --- a/drivers/hwmon/ibmpowernv.c +++ b/drivers/hwmon/ibmpowernv.c @@ -51,6 +51,7 @@ enum sensors { POWER_SUPPLY, POWER_INPUT, CURRENT, + RESET_HISTORY, MAX_SENSOR_TYPE, }; @@ -78,6 +79,7 @@ enum sensors { { "in" }, { "power" }, { "curr" }, + { "reset_history" }, }; struct sensor_data { @@ -126,6 +128,25 @@ static ssize_t show_label(struct device *dev, struct device_attribute *devattr, return sprintf(buf, "%s\n", sdata->label); } +static ssize_t store_reset_history(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct sensor_data *sdata = container_of(devattr, struct sensor_data, + dev_attr); + int rc; + int reset; + + rc = kstrtoint(buf, 0, &reset); + if (rc) + return rc; + + if (reset == 1) + rc = opal_sensor_groups_clear_history(sdata->id); + + return rc ? rc : count; +} + static int __init get_logical_cpu(int hwcpu) { int cpu; @@ -458,6 +479,16 @@ static int create_device_attrs(struct platform_device *pdev) create_hwmon_attr(&sdata[count], attr_name, show_sensor); + if (type == RESET_HISTORY) { + snprintf(sdata[count].name, MAX_ATTR_LEN, "%s%d", + sensor_groups[type].name, + sdata[count].hwmon_index); + + sdata[count].dev_attr.attr.mode = 0220; + sdata[count].dev_attr.store = store_reset_history; + sdata[count].dev_attr.show = NULL; + } + pgroups[type]->attrs[sensor_groups[type].attr_count++] = &sdata[count++].dev_attr.attr; -- 1.8.3.1
