hwmon: (ibmpowernv) Add attributes to enable/disable sensor groups

OPAL firmware provides the facility for some groups of sensors to be
enabled/disabled at runtime to give the user the option of using the
system resources for collecting these sensors or not.

For example, on POWER9 systems, the On Chip Controller (OCC) gathers
various system and chip level sensors and maintains their values in
main memory.

This patch provides support for enabling/disabling the sensor groups
like power, temperature, current and voltage.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
[stewart@linux.vnet.ibm.com: Commit message]
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 206 insertions, 32 deletions

diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index f829dadfd5a0..83472808c816 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -90,11 +90,20 @@ struct sensor_data {
 	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,
@@ -105,6 +114,9 @@ static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
 	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)
@@ -120,6 +132,46 @@ static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
 	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)
 {
@@ -292,12 +344,115 @@ static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
 	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) {
@@ -344,7 +499,10 @@ static int populate_attr_groups(struct platform_device *pdev)
 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))
+					      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,
@@ -352,23 +510,33 @@ static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
 
 	sysfs_attr_init(&sdata->dev_attr.attr);
 	sdata->dev_attr.attr.name = sdata->name;
-	sdata->dev_attr.attr.mode = S_IRUGO;
 	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))
+					    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);
+	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)
@@ -403,24 +571,23 @@ static int create_device_attrs(struct platform_device *pdev)
 	const struct attribute_group **pgroups = pdata->attr_groups;
 	struct device_node *opal, *np;
 	struct sensor_data *sdata;
-	u32 sensor_id;
-	enum sensors type;
 	u32 count = 0;
-	int err = 0;
+	u32 group_attr_id[MAX_SENSOR_TYPE] = {0};
 
-	opal = of_find_node_by_path("/ibm,opal/sensors");
 	sdata = devm_kcalloc(&pdev->dev,
 			     pdata->sensors_count, sizeof(*sdata),
 			     GFP_KERNEL);
-	if (!sdata) {
-		err = -ENOMEM;
-		goto exit_put_node;
-	}
+	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;
+		u32 opal_index, hw_id;
+		u32 sensor_id;
 		const char *label;
+		enum sensors type;
 
 		if (np->name == NULL)
 			continue;
@@ -456,14 +623,12 @@ static int create_device_attrs(struct platform_device *pdev)
 			opal_index = INVALID_INDEX;
 		}
 
-		sdata[count].opal_index = opal_index;
-		sdata[count].hwmon_index =
-			get_sensor_hwmon_index(&sdata[count], sdata, count);
-
-		create_hwmon_attr(&sdata[count], attr_name, show_sensor);
-
-		pgroups[type]->attrs[sensor_groups[type].attr_count++] =
-				&sdata[count++].dev_attr.attr;
+		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)) {
 			/*
@@ -474,35 +639,43 @@ static int create_device_attrs(struct platform_device *pdev)
 			 */
 
 			make_sensor_label(np, &sdata[count], label);
-			populate_sensor(&sdata[count], opal_index,
-					sdata[count - 1].hwmon_index,
+			populate_sensor(&sdata[count], opal_index, hw_id,
 					sensor_id, "label", type, pgroups[type],
-					show_label);
+					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,
-					sdata[count - 1].hwmon_index,
+			populate_sensor(&sdata[count], opal_index, hw_id,
 					sensor_id, attr_name, type,
-					pgroups[type], show_sensor);
+					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,
-					sdata[count - 1].hwmon_index,
+			populate_sensor(&sdata[count], opal_index, hw_id,
 					sensor_id, attr_name, type,
-					pgroups[type], show_sensor);
+					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++;
 		}
 	}
 
-exit_put_node:
 	of_node_put(opal);
-	return err;
+	return 0;
 }
 
 static int ibmpowernv_probe(struct platform_device *pdev)
@@ -517,6 +690,7 @@ static int ibmpowernv_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pdata);
 	pdata->sensors_count = 0;
+	pdata->nr_sensor_groups = 0;
 	err = populate_attr_groups(pdev);
 	if (err)
 		return err;