[PATCH linux dev-4.10] drivers/hwmon/occ: Add temperature fault attribute and VRM temp alarm

[Eddie James]

From: Eddie James <eajames at us.ibm.com>

VRM temp doesn't return temperature, only alarm bit.
Add fault attribute, triggered when the temp sensor returns the 0xFF code.

Signed-off-by: Eddie James <eajames at us.ibm.com>
---
 drivers/hwmon/occ/common.c | 38 +++++++++++++++++++++++++++++++++++---
 1 file changed, 35 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
index 34002fb6a4e7..8ffb55682a60 100644
--- a/drivers/hwmon/occ/common.c
+++ b/drivers/hwmon/occ/common.c
@@ -19,6 +19,10 @@
 #define OCC_EXT_STAT_MEM_THROTTLE	0x20
 #define OCC_EXT_STAT_QUICK_DROP		0x10
 
+#define OCC_TEMP_SENSOR_FAULT		0xFF
+
+#define OCC_FRU_TYPE_VRM		3
+
 atomic_t occ_num_occs = ATOMIC_INIT(0);
 
 struct temp_sensor_1 {
@@ -377,11 +381,23 @@ static ssize_t occ_show_temp_2(struct device *dev,
 		val = get_unaligned_be32(&temp->sensor_id);
 		break;
 	case 1:
-		val = temp->value * 1000;
+		val = temp->value;
+		if (val == OCC_TEMP_SENSOR_FAULT)
+			return -EREMOTEIO;
+
+		if (temp->fru_type != OCC_FRU_TYPE_VRM) {
+			if (val == 0)
+				return -EAGAIN;
+
+			val *= 1000;
+		}
 		break;
 	case 2:
 		val = temp->fru_type;
 		break;
+	case 3:
+		val = temp->value == OCC_TEMP_SENSOR_FAULT;
+		break;
 	}
 
 	return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
@@ -780,6 +796,7 @@ static ssize_t occ_show_extended(struct device *dev,
 int occ_setup_sensor_attrs(struct occ *occ)
 {
 	unsigned int i, s;
+	struct temp_sensor_2 *temp;
 	struct device *dev = occ->bus_dev;
 	struct occ_sensors *sensors = &occ->sensors;
 	struct occ_attribute *attr;
@@ -799,7 +816,7 @@ int occ_setup_sensor_attrs(struct occ *occ)
 		occ->num_attrs += (sensors->temp.num_sensors * 2);
 		break;
 	case 2:
-		occ->num_attrs += (sensors->temp.num_sensors * 3);
+		occ->num_attrs += (sensors->temp.num_sensors * 4);
 		show_temp = occ_show_temp_2;
 		break;
 	default:
@@ -871,13 +888,22 @@ int occ_setup_sensor_attrs(struct occ *occ)
 
 	for (i = 0; i < sensors->temp.num_sensors; ++i) {
 		s = i + 1;
+		temp = ((struct temp_sensor_2 *)sensors->temp.data) + i;
 
 		snprintf(attr->name, sizeof(attr->name), "temp%d_label", s);
 		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
 					     0, i);
 		attr++;
 
-		snprintf(attr->name, sizeof(attr->name), "temp%d_input", s);
+		if (sensors->temp.version > 1 &&
+		    temp->fru_type == OCC_FRU_TYPE_VRM) {
+			snprintf(attr->name, sizeof(attr->name), "temp%d_alarm",
+				 s);
+		} else {
+			snprintf(attr->name, sizeof(attr->name), "temp%d_input",
+				 s);
+		}
+
 		attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
 					     1, i);
 		attr++;
@@ -888,6 +914,12 @@ int occ_setup_sensor_attrs(struct occ *occ)
 			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 						     show_temp, NULL, 2, i);
 			attr++;
+
+			snprintf(attr->name, sizeof(attr->name), "temp%d_fault",
+				 s);
+			attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+						     show_temp, NULL, 3, i);
+			attr++;
 		}
 	}
 
-- 
2.11.0 (Apple Git-81)