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

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Date:   Tue, 15 Feb 2022 09:10:19 -0600
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-hwmon@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jdelvare@...e.com,
        linux@...ck-us.net, joel@....id.au, eajames@...ux.ibm.com
Subject: [PATCH 1/4] hwmon: (occ) Add sysfs entry for IPS (Idle Power Saver) status

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@...ux.ibm.com>
---
 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