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-rw-r--r--drivers/hwmon/ibmpowernv.c719
1 files changed, 719 insertions, 0 deletions
diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
new file mode 100644
index 000000000..8e3724728
--- /dev/null
+++ b/drivers/hwmon/ibmpowernv.c
@@ -0,0 +1,719 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * IBM PowerNV platform sensors for temperature/fan/voltage/power
+ * Copyright (C) 2014 IBM
+ */
+
+#define DRVNAME "ibmpowernv"
+#define pr_fmt(fmt) DRVNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include <linux/platform_device.h>
+#include <asm/opal.h>
+#include <linux/err.h>
+#include <asm/cputhreads.h>
+#include <asm/smp.h>
+
+#define MAX_ATTR_LEN 32
+#define MAX_LABEL_LEN 64
+
+/* Sensor suffix name from DT */
+#define DT_FAULT_ATTR_SUFFIX "faulted"
+#define DT_DATA_ATTR_SUFFIX "data"
+#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
+
+/*
+ * Enumerates all the types of sensors in the POWERNV platform and does index
+ * into 'struct sensor_group'
+ */
+enum sensors {
+ FAN,
+ TEMP,
+ POWER_SUPPLY,
+ POWER_INPUT,
+ CURRENT,
+ ENERGY,
+ MAX_SENSOR_TYPE,
+};
+
+#define INVALID_INDEX (-1U)
+
+/*
+ * 'compatible' string properties for sensor types as defined in old
+ * PowerNV firmware (skiboot). These are ordered as 'enum sensors'.
+ */
+static const char * const legacy_compatibles[] = {
+ "ibm,opal-sensor-cooling-fan",
+ "ibm,opal-sensor-amb-temp",
+ "ibm,opal-sensor-power-supply",
+ "ibm,opal-sensor-power"
+};
+
+static struct sensor_group {
+ const char *name; /* matches property 'sensor-type' */
+ struct attribute_group group;
+ u32 attr_count;
+ u32 hwmon_index;
+} sensor_groups[] = {
+ { "fan" },
+ { "temp" },
+ { "in" },
+ { "power" },
+ { "curr" },
+ { "energy" },
+};
+
+struct sensor_data {
+ u32 id; /* An opaque id of the firmware for each sensor */
+ u32 hwmon_index;
+ u32 opal_index;
+ enum sensors type;
+ char label[MAX_LABEL_LEN];
+ char name[MAX_ATTR_LEN];
+ struct device_attribute dev_attr;
+ struct sensor_group_data *sgrp_data;
+};
+
+struct sensor_group_data {
+ struct mutex mutex;
+ u32 gid;
+ bool enable;
+};
+
+struct platform_data {
+ const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
+ struct sensor_group_data *sgrp_data;
+ u32 sensors_count; /* Total count of sensors from each group */
+ u32 nr_sensor_groups; /* Total number of sensor groups */
+};
+
+static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_data *sdata = container_of(devattr, struct sensor_data,
+ dev_attr);
+ ssize_t ret;
+ u64 x;
+
+ if (sdata->sgrp_data && !sdata->sgrp_data->enable)
+ return -ENODATA;
+
+ ret = opal_get_sensor_data_u64(sdata->id, &x);
+
+ if (ret)
+ return ret;
+
+ /* Convert temperature to milli-degrees */
+ if (sdata->type == TEMP)
+ x *= 1000;
+ /* Convert power to micro-watts */
+ else if (sdata->type == POWER_INPUT)
+ x *= 1000000;
+
+ return sprintf(buf, "%llu\n", x);
+}
+
+static ssize_t show_enable(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_data *sdata = container_of(devattr, struct sensor_data,
+ dev_attr);
+
+ return sprintf(buf, "%u\n", sdata->sgrp_data->enable);
+}
+
+static ssize_t store_enable(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);
+ struct sensor_group_data *sgrp_data = sdata->sgrp_data;
+ int ret;
+ bool data;
+
+ ret = kstrtobool(buf, &data);
+ if (ret)
+ return ret;
+
+ ret = mutex_lock_interruptible(&sgrp_data->mutex);
+ if (ret)
+ return ret;
+
+ if (data != sgrp_data->enable) {
+ ret = sensor_group_enable(sgrp_data->gid, data);
+ if (!ret)
+ sgrp_data->enable = data;
+ }
+
+ if (!ret)
+ ret = count;
+
+ mutex_unlock(&sgrp_data->mutex);
+ return ret;
+}
+
+static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_data *sdata = container_of(devattr, struct sensor_data,
+ dev_attr);
+
+ return sprintf(buf, "%s\n", sdata->label);
+}
+
+static int get_logical_cpu(int hwcpu)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ if (get_hard_smp_processor_id(cpu) == hwcpu)
+ return cpu;
+
+ return -ENOENT;
+}
+
+static void make_sensor_label(struct device_node *np,
+ struct sensor_data *sdata, const char *label)
+{
+ u32 id;
+ size_t n;
+
+ n = scnprintf(sdata->label, sizeof(sdata->label), "%s", label);
+
+ /*
+ * Core temp pretty print
+ */
+ if (!of_property_read_u32(np, "ibm,pir", &id)) {
+ int cpuid = get_logical_cpu(id);
+
+ if (cpuid >= 0)
+ /*
+ * The digital thermal sensors are associated
+ * with a core.
+ */
+ n += scnprintf(sdata->label + n,
+ sizeof(sdata->label) - n, " %d",
+ cpuid);
+ else
+ n += scnprintf(sdata->label + n,
+ sizeof(sdata->label) - n, " phy%d", id);
+ }
+
+ /*
+ * Membuffer pretty print
+ */
+ if (!of_property_read_u32(np, "ibm,chip-id", &id))
+ n += scnprintf(sdata->label + n, sizeof(sdata->label) - n,
+ " %d", id & 0xffff);
+}
+
+static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
+{
+ char *hash_pos = strchr(name, '#');
+ char buf[8] = { 0 };
+ char *dash_pos;
+ u32 copy_len;
+ int err;
+
+ if (!hash_pos)
+ return -EINVAL;
+
+ dash_pos = strchr(hash_pos, '-');
+ if (!dash_pos)
+ return -EINVAL;
+
+ copy_len = dash_pos - hash_pos - 1;
+ if (copy_len >= sizeof(buf))
+ return -EINVAL;
+
+ strncpy(buf, hash_pos + 1, copy_len);
+
+ err = kstrtou32(buf, 10, index);
+ if (err)
+ return err;
+
+ strscpy(attr, dash_pos + 1, MAX_ATTR_LEN);
+
+ return 0;
+}
+
+static const char *convert_opal_attr_name(enum sensors type,
+ const char *opal_attr)
+{
+ const char *attr_name = NULL;
+
+ if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
+ attr_name = "fault";
+ } else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
+ attr_name = "input";
+ } else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
+ if (type == TEMP)
+ attr_name = "max";
+ else if (type == FAN)
+ attr_name = "min";
+ }
+
+ return attr_name;
+}
+
+/*
+ * This function translates the DT node name into the 'hwmon' attribute name.
+ * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
+ * which need to be mapped as fan2_input, temp1_max respectively before
+ * populating them inside hwmon device class.
+ */
+static const char *parse_opal_node_name(const char *node_name,
+ enum sensors type, u32 *index)
+{
+ char attr_suffix[MAX_ATTR_LEN];
+ const char *attr_name;
+ int err;
+
+ err = get_sensor_index_attr(node_name, index, attr_suffix);
+ if (err)
+ return ERR_PTR(err);
+
+ attr_name = convert_opal_attr_name(type, attr_suffix);
+ if (!attr_name)
+ return ERR_PTR(-ENOENT);
+
+ return attr_name;
+}
+
+static int get_sensor_type(struct device_node *np)
+{
+ enum sensors type;
+ const char *str;
+
+ for (type = 0; type < ARRAY_SIZE(legacy_compatibles); type++) {
+ if (of_device_is_compatible(np, legacy_compatibles[type]))
+ return type;
+ }
+
+ /*
+ * Let's check if we have a newer device tree
+ */
+ if (!of_device_is_compatible(np, "ibm,opal-sensor"))
+ return MAX_SENSOR_TYPE;
+
+ if (of_property_read_string(np, "sensor-type", &str))
+ return MAX_SENSOR_TYPE;
+
+ for (type = 0; type < MAX_SENSOR_TYPE; type++)
+ if (!strcmp(str, sensor_groups[type].name))
+ return type;
+
+ return MAX_SENSOR_TYPE;
+}
+
+static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
+ struct sensor_data *sdata_table, int count)
+{
+ int i;
+
+ /*
+ * We don't use the OPAL index on newer device trees
+ */
+ if (sdata->opal_index != INVALID_INDEX) {
+ for (i = 0; i < count; i++)
+ if (sdata_table[i].opal_index == sdata->opal_index &&
+ sdata_table[i].type == sdata->type)
+ return sdata_table[i].hwmon_index;
+ }
+ return ++sensor_groups[sdata->type].hwmon_index;
+}
+
+static int init_sensor_group_data(struct platform_device *pdev,
+ struct platform_data *pdata)
+{
+ struct sensor_group_data *sgrp_data;
+ struct device_node *groups, *sgrp;
+ int count = 0, ret = 0;
+ enum sensors type;
+
+ groups = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
+ if (!groups)
+ return ret;
+
+ for_each_child_of_node(groups, sgrp) {
+ type = get_sensor_type(sgrp);
+ if (type != MAX_SENSOR_TYPE)
+ pdata->nr_sensor_groups++;
+ }
+
+ if (!pdata->nr_sensor_groups)
+ goto out;
+
+ sgrp_data = devm_kcalloc(&pdev->dev, pdata->nr_sensor_groups,
+ sizeof(*sgrp_data), GFP_KERNEL);
+ if (!sgrp_data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for_each_child_of_node(groups, sgrp) {
+ u32 gid;
+
+ type = get_sensor_type(sgrp);
+ if (type == MAX_SENSOR_TYPE)
+ continue;
+
+ if (of_property_read_u32(sgrp, "sensor-group-id", &gid))
+ continue;
+
+ if (of_count_phandle_with_args(sgrp, "sensors", NULL) <= 0)
+ continue;
+
+ sensor_groups[type].attr_count++;
+ sgrp_data[count].gid = gid;
+ mutex_init(&sgrp_data[count].mutex);
+ sgrp_data[count++].enable = false;
+ }
+
+ pdata->sgrp_data = sgrp_data;
+out:
+ of_node_put(groups);
+ return ret;
+}
+
+static struct sensor_group_data *get_sensor_group(struct platform_data *pdata,
+ struct device_node *node,
+ enum sensors gtype)
+{
+ struct sensor_group_data *sgrp_data = pdata->sgrp_data;
+ struct device_node *groups, *sgrp;
+
+ groups = of_find_compatible_node(NULL, NULL, "ibm,opal-sensor-group");
+ if (!groups)
+ return NULL;
+
+ for_each_child_of_node(groups, sgrp) {
+ struct of_phandle_iterator it;
+ u32 gid;
+ int rc, i;
+ enum sensors type;
+
+ type = get_sensor_type(sgrp);
+ if (type != gtype)
+ continue;
+
+ if (of_property_read_u32(sgrp, "sensor-group-id", &gid))
+ continue;
+
+ of_for_each_phandle(&it, rc, sgrp, "sensors", NULL, 0)
+ if (it.phandle == node->phandle) {
+ of_node_put(it.node);
+ break;
+ }
+
+ if (rc)
+ continue;
+
+ for (i = 0; i < pdata->nr_sensor_groups; i++)
+ if (gid == sgrp_data[i].gid) {
+ of_node_put(sgrp);
+ of_node_put(groups);
+ return &sgrp_data[i];
+ }
+ }
+
+ of_node_put(groups);
+ return NULL;
+}
+
+static int populate_attr_groups(struct platform_device *pdev)
+{
+ struct platform_data *pdata = platform_get_drvdata(pdev);
+ const struct attribute_group **pgroups = pdata->attr_groups;
+ struct device_node *opal, *np;
+ enum sensors type;
+ int ret;
+
+ ret = init_sensor_group_data(pdev, pdata);
+ if (ret)
+ return ret;
+
+ opal = of_find_node_by_path("/ibm,opal/sensors");
+ for_each_child_of_node(opal, np) {
+ const char *label;
+
+ type = get_sensor_type(np);
+ if (type == MAX_SENSOR_TYPE)
+ continue;
+
+ sensor_groups[type].attr_count++;
+
+ /*
+ * add attributes for labels, min and max
+ */
+ if (!of_property_read_string(np, "label", &label))
+ sensor_groups[type].attr_count++;
+ if (of_find_property(np, "sensor-data-min", NULL))
+ sensor_groups[type].attr_count++;
+ if (of_find_property(np, "sensor-data-max", NULL))
+ sensor_groups[type].attr_count++;
+ }
+
+ of_node_put(opal);
+
+ for (type = 0; type < MAX_SENSOR_TYPE; type++) {
+ sensor_groups[type].group.attrs = devm_kcalloc(&pdev->dev,
+ sensor_groups[type].attr_count + 1,
+ sizeof(struct attribute *),
+ GFP_KERNEL);
+ if (!sensor_groups[type].group.attrs)
+ return -ENOMEM;
+
+ pgroups[type] = &sensor_groups[type].group;
+ pdata->sensors_count += sensor_groups[type].attr_count;
+ sensor_groups[type].attr_count = 0;
+ }
+
+ return 0;
+}
+
+static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
+ ssize_t (*show)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf),
+ ssize_t (*store)(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count))
+{
+ snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
+ sensor_groups[sdata->type].name, sdata->hwmon_index,
+ attr_name);
+
+ sysfs_attr_init(&sdata->dev_attr.attr);
+ sdata->dev_attr.attr.name = sdata->name;
+ sdata->dev_attr.show = show;
+ if (store) {
+ sdata->dev_attr.store = store;
+ sdata->dev_attr.attr.mode = 0664;
+ } else {
+ sdata->dev_attr.attr.mode = 0444;
+ }
+}
+
+static void populate_sensor(struct sensor_data *sdata, int od, int hd, int sid,
+ const char *attr_name, enum sensors type,
+ const struct attribute_group *pgroup,
+ struct sensor_group_data *sgrp_data,
+ ssize_t (*show)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf),
+ ssize_t (*store)(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count))
+{
+ sdata->id = sid;
+ sdata->type = type;
+ sdata->opal_index = od;
+ sdata->hwmon_index = hd;
+ create_hwmon_attr(sdata, attr_name, show, store);
+ pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr;
+ sdata->sgrp_data = sgrp_data;
+}
+
+static char *get_max_attr(enum sensors type)
+{
+ switch (type) {
+ case POWER_INPUT:
+ return "input_highest";
+ default:
+ return "highest";
+ }
+}
+
+static char *get_min_attr(enum sensors type)
+{
+ switch (type) {
+ case POWER_INPUT:
+ return "input_lowest";
+ default:
+ return "lowest";
+ }
+}
+
+/*
+ * Iterate through the device tree for each child of 'sensors' node, create
+ * a sysfs attribute file, the file is named by translating the DT node name
+ * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
+ * etc..
+ */
+static int create_device_attrs(struct platform_device *pdev)
+{
+ struct platform_data *pdata = platform_get_drvdata(pdev);
+ const struct attribute_group **pgroups = pdata->attr_groups;
+ struct device_node *opal, *np;
+ struct sensor_data *sdata;
+ u32 count = 0;
+ u32 group_attr_id[MAX_SENSOR_TYPE] = {0};
+
+ sdata = devm_kcalloc(&pdev->dev,
+ pdata->sensors_count, sizeof(*sdata),
+ GFP_KERNEL);
+ if (!sdata)
+ return -ENOMEM;
+
+ opal = of_find_node_by_path("/ibm,opal/sensors");
+ for_each_child_of_node(opal, np) {
+ struct sensor_group_data *sgrp_data;
+ const char *attr_name;
+ u32 opal_index, hw_id;
+ u32 sensor_id;
+ const char *label;
+ enum sensors type;
+
+ type = get_sensor_type(np);
+ if (type == MAX_SENSOR_TYPE)
+ continue;
+
+ /*
+ * Newer device trees use a "sensor-data" property
+ * name for input.
+ */
+ if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
+ of_property_read_u32(np, "sensor-data", &sensor_id)) {
+ dev_info(&pdev->dev,
+ "'sensor-id' missing in the node '%pOFn'\n",
+ np);
+ continue;
+ }
+
+ sdata[count].id = sensor_id;
+ sdata[count].type = type;
+
+ /*
+ * If we can not parse the node name, it means we are
+ * running on a newer device tree. We can just forget
+ * about the OPAL index and use a defaut value for the
+ * hwmon attribute name
+ */
+ attr_name = parse_opal_node_name(np->name, type, &opal_index);
+ if (IS_ERR(attr_name)) {
+ attr_name = "input";
+ opal_index = INVALID_INDEX;
+ }
+
+ hw_id = get_sensor_hwmon_index(&sdata[count], sdata, count);
+ sgrp_data = get_sensor_group(pdata, np, type);
+ populate_sensor(&sdata[count], opal_index, hw_id, sensor_id,
+ attr_name, type, pgroups[type], sgrp_data,
+ show_sensor, NULL);
+ count++;
+
+ if (!of_property_read_string(np, "label", &label)) {
+ /*
+ * For the label attribute, we can reuse the
+ * "properties" of the previous "input"
+ * attribute. They are related to the same
+ * sensor.
+ */
+
+ make_sensor_label(np, &sdata[count], label);
+ populate_sensor(&sdata[count], opal_index, hw_id,
+ sensor_id, "label", type, pgroups[type],
+ NULL, show_label, NULL);
+ count++;
+ }
+
+ if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
+ attr_name = get_max_attr(type);
+ populate_sensor(&sdata[count], opal_index, hw_id,
+ sensor_id, attr_name, type,
+ pgroups[type], sgrp_data, show_sensor,
+ NULL);
+ count++;
+ }
+
+ if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
+ attr_name = get_min_attr(type);
+ populate_sensor(&sdata[count], opal_index, hw_id,
+ sensor_id, attr_name, type,
+ pgroups[type], sgrp_data, show_sensor,
+ NULL);
+ count++;
+ }
+
+ if (sgrp_data && !sgrp_data->enable) {
+ sgrp_data->enable = true;
+ hw_id = ++group_attr_id[type];
+ populate_sensor(&sdata[count], opal_index, hw_id,
+ sgrp_data->gid, "enable", type,
+ pgroups[type], sgrp_data, show_enable,
+ store_enable);
+ count++;
+ }
+ }
+
+ of_node_put(opal);
+ return 0;
+}
+
+static int ibmpowernv_probe(struct platform_device *pdev)
+{
+ struct platform_data *pdata;
+ struct device *hwmon_dev;
+ int err;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, pdata);
+ pdata->sensors_count = 0;
+ pdata->nr_sensor_groups = 0;
+ err = populate_attr_groups(pdev);
+ if (err)
+ return err;
+
+ /* Create sysfs attribute data for each sensor found in the DT */
+ err = create_device_attrs(pdev);
+ if (err)
+ return err;
+
+ /* Finally, register with hwmon */
+ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
+ pdata,
+ pdata->attr_groups);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct platform_device_id opal_sensor_driver_ids[] = {
+ {
+ .name = "opal-sensor",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);
+
+static const struct of_device_id opal_sensor_match[] = {
+ { .compatible = "ibm,opal-sensor" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, opal_sensor_match);
+
+static struct platform_driver ibmpowernv_driver = {
+ .probe = ibmpowernv_probe,
+ .id_table = opal_sensor_driver_ids,
+ .driver = {
+ .name = DRVNAME,
+ .of_match_table = opal_sensor_match,
+ },
+};
+
+module_platform_driver(ibmpowernv_driver);
+
+MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("IBM POWERNV platform sensors");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-03 16:26:10 +0000