netdev - [PATCH net-next v2 6/9] bnxt_en: Use non-standard attribute to expose shutdown temperature

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Date: Tue, 26 Sep 2023 20:57:31 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com,
	Kalesh AP <kalesh-anakkur.purayil@...adcom.com>,
	Andy Gospodarek <andrew.gospodarek@...adcom.com>
Subject: [PATCH net-next v2 6/9] bnxt_en: Use non-standard attribute to expose shutdown temperature

From: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>

Implement the sysfs attributes directly in the driver for
shutdown threshold temperature and pass an extra attribute group
to the hwmon core when registering the hwmon device.

Link: https://lore.kernel.org/netdev/20230815045658.80494-12-michael.chan@broadcom.com/
 Cc: Jean Delvare <jdelvare@...e.com>
 Cc: Guenter Roeck <linux@...ck-us.net>
 Cc: linux-hwmon@...r.kernel.org
Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 .../net/ethernet/broadcom/bnxt/bnxt_hwmon.c   | 54 ++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.c
index 6a2cad5cc159..6d36158df26e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwmon.c
@@ -131,6 +131,57 @@ static const struct hwmon_chip_info bnxt_hwmon_chip_info = {
 	.info   = bnxt_hwmon_info,
 };
 
+static ssize_t temp1_shutdown_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct bnxt *bp = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", bp->shutdown_thresh_temp * 1000);
+}
+
+static ssize_t temp1_shutdown_alarm_show(struct device *dev,
+					 struct device_attribute *attr, char *buf)
+{
+	struct bnxt *bp = dev_get_drvdata(dev);
+	u8 temp;
+	int rc;
+
+	rc = bnxt_hwrm_temp_query(bp, &temp);
+	if (rc)
+		return -EIO;
+
+	return sysfs_emit(buf, "%u\n", temp >= bp->shutdown_thresh_temp);
+}
+
+static DEVICE_ATTR_RO(temp1_shutdown);
+static DEVICE_ATTR_RO(temp1_shutdown_alarm);
+
+static struct attribute *bnxt_temp_extra_attrs[] = {
+	&dev_attr_temp1_shutdown.attr,
+	&dev_attr_temp1_shutdown_alarm.attr,
+	NULL,
+};
+
+static umode_t bnxt_temp_extra_attrs_visible(struct kobject *kobj,
+					     struct attribute *attr, int index)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct bnxt *bp = dev_get_drvdata(dev);
+
+	/* Shutdown temperature setting in NVM is optional */
+	if (!(bp->fw_cap & BNXT_FW_CAP_THRESHOLD_TEMP_SUPPORTED) ||
+	    !bp->shutdown_thresh_temp)
+		return 0;
+
+	return attr->mode;
+}
+
+static const struct attribute_group bnxt_temp_extra_group = {
+	.attrs		= bnxt_temp_extra_attrs,
+	.is_visible	= bnxt_temp_extra_attrs_visible,
+};
+__ATTRIBUTE_GROUPS(bnxt_temp_extra);
+
 void bnxt_hwmon_uninit(struct bnxt *bp)
 {
 	if (bp->hwmon_dev) {
@@ -156,7 +207,8 @@ void bnxt_hwmon_init(struct bnxt *bp)
 
 	bp->hwmon_dev = hwmon_device_register_with_info(&pdev->dev,
 							DRV_MODULE_NAME, bp,
-							&bnxt_hwmon_chip_info, NULL);
+							&bnxt_hwmon_chip_info,
+							bnxt_temp_extra_groups);
 	if (IS_ERR(bp->hwmon_dev)) {
 		bp->hwmon_dev = NULL;
 		dev_warn(&pdev->dev, "Cannot register hwmon device\n");
-- 
2.30.1


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