[PATCH V3] hwmon: (ibmpowernv) Add highest/lowest attributes to sensors

[Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>]

OCC provides historical minimum and maximum value for the sensor
readings. This patch exports them as highest and lowest attributes
for the inband sensors copied by OCC to main memory.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
---
Changes from V2:
- Dropped "curr" type of sensors to fix the compatible string in
  skiboot
- Renamed the sensor attributes to indicate highest/lowest

 drivers/hwmon/ibmpowernv.c | 84 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 66 insertions(+), 18 deletions(-)

diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index 6d2e660..5462c16 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -287,6 +287,7 @@ static int populate_attr_groups(struct platform_device *pdev)
 	opal = of_find_node_by_path("/ibm,opal/sensors");
 	for_each_child_of_node(opal, np) {
 		const char *label;
+		int len;
 
 		if (np->name == NULL)
 			continue;
@@ -298,10 +299,14 @@ static int populate_attr_groups(struct platform_device *pdev)
 		sensor_groups[type].attr_count++;
 
 		/*
-		 * add a new attribute for labels
+		 * 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", &len))
+			sensor_groups[type].attr_count++;
+		if (of_find_property(np, "sensor-data-max", &len))
+			sensor_groups[type].attr_count++;
 	}
 
 	of_node_put(opal);
@@ -337,6 +342,41 @@ static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
 	sdata->dev_attr.show = show;
 }
 
+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,
+			    ssize_t (*show)(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf))
+{
+	sdata->id = sid;
+	sdata->type = type;
+	sdata->opal_index = od;
+	sdata->hwmon_index = hd;
+	create_hwmon_attr(sdata, attr_name, show);
+	pgroup->attrs[sensor_groups[type].attr_count++] = &sdata->dev_attr.attr;
+}
+
+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
@@ -365,6 +405,7 @@ static int create_device_attrs(struct platform_device *pdev)
 	for_each_child_of_node(opal, np) {
 		const char *attr_name;
 		u32 opal_index;
+		u32 hwmon_index;
 		const char *label;
 
 		if (np->name == NULL)
@@ -386,9 +427,6 @@ static int create_device_attrs(struct platform_device *pdev)
 			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
@@ -401,14 +439,12 @@ 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;
+		hwmon_index = get_sensor_hwmon_index(&sdata[count], sdata,
+						     count);
+		populate_sensor(&sdata[count], opal_index, hwmon_index,
+				sensor_id, attr_name, type, pgroups[type],
+				show_sensor);
+		count++;
 
 		if (!of_property_read_string(np, "label", &label)) {
 			/*
@@ -417,16 +453,28 @@ static int create_device_attrs(struct platform_device *pdev)
 			 * attribute. They are related to the same
 			 * sensor.
 			 */
-			sdata[count].type = type;
-			sdata[count].opal_index = sdata[count - 1].opal_index;
-			sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
 
 			make_sensor_label(np, &sdata[count], label);
+			populate_sensor(&sdata[count], opal_index, hwmon_index,
+					sensor_id, "label", type, pgroups[type],
+					show_label);
+			count++;
+		}
 
-			create_hwmon_attr(&sdata[count], "label", show_label);
+		if (!of_property_read_u32(np, "sensor-data-max", &sensor_id)) {
+			attr_name = get_max_attr(type);
+			populate_sensor(&sdata[count], opal_index, hwmon_index,
+					sensor_id, attr_name, type,
+					pgroups[type], show_sensor);
+			count++;
+		}
 
-			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
-				&sdata[count++].dev_attr.attr;
+		if (!of_property_read_u32(np, "sensor-data-min", &sensor_id)) {
+			attr_name = get_min_attr(type);
+			populate_sensor(&sdata[count], opal_index, hwmon_index,
+					sensor_id, attr_name, type,
+					pgroups[type], show_sensor);
+			count++;
 		}
 	}
 
-- 
1.8.3.1