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@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220215151022.7498-2-eajames@linux.ibm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
index 5020117..a88c66d 100644 (file)
--- 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 03b16ab..6dc69c9 100644 (file)
--- 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 @@ done:
        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)