[PATCH 1/4] hwmon: (occ) Add sysfs entry for IPS (Idle Power Saver) status

[Eddie James]

BMC control applications need to check the Idle Power Saver status
byte returned by the OCC poll response, so export it in sysfs with
the other OCC-specific data.

Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx>
---
 drivers/hwmon/occ/common.h |  1 +
 drivers/hwmon/occ/sysfs.c  | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
index 5020117be740..a88c66d36e38 100644
--- a/drivers/hwmon/occ/common.h
+++ b/drivers/hwmon/occ/common.h
@@ -119,6 +119,7 @@ struct occ {
 	u8 prev_stat;
 	u8 prev_ext_stat;
 	u8 prev_occs_present;
+	u8 prev_ips_status;
 };
 
 int occ_setup(struct occ *occ, const char *name);
diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c
index 03b16abef67f..6dc69c9aa4c2 100644
--- a/drivers/hwmon/occ/sysfs.c
+++ b/drivers/hwmon/occ/sysfs.c
@@ -63,6 +63,9 @@ static ssize_t occ_sysfs_show(struct device *dev,
 		else
 			val = 1;
 		break;
+	case 8:
+		val = header->ips_status;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -88,6 +91,7 @@ static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
 static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
 static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
 static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
+static SENSOR_DEVICE_ATTR(occ_ips_status, 0444, occ_sysfs_show, NULL, 8);
 static DEVICE_ATTR_RO(occ_error);
 
 static struct attribute *occ_attributes[] = {
@@ -99,6 +103,7 @@ static struct attribute *occ_attributes[] = {
 	&sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
 	&sensor_dev_attr_occ_state.dev_attr.attr,
 	&sensor_dev_attr_occs_present.dev_attr.attr,
+	&sensor_dev_attr_occ_ips_status.dev_attr.attr,
 	&dev_attr_occ_error.attr,
 	NULL
 };
@@ -162,6 +167,11 @@ void occ_sysfs_poll_done(struct occ *occ)
 		sysfs_notify(&occ->bus_dev->kobj, NULL, name);
 	}
 
+	if (header->ips_status != occ->prev_ips_status) {
+		name = sensor_dev_attr_occ_ips_status.dev_attr.attr.name;
+		sysfs_notify(&occ->bus_dev->kobj, NULL, name);
+	}
+
 	if (occ->error && occ->error != occ->prev_error) {
 		name = dev_attr_occ_error.attr.name;
 		sysfs_notify(&occ->bus_dev->kobj, NULL, name);
@@ -174,6 +184,7 @@ void occ_sysfs_poll_done(struct occ *occ)
 	occ->prev_stat = header->status;
 	occ->prev_ext_stat = header->ext_status;
 	occ->prev_occs_present = header->occs_present;
+	occ->prev_ips_status = header->ips_status;
 }
 
 int occ_setup_sysfs(struct occ *occ)
-- 
2.27.0