net: aquantia: implement hwmon api for chip temperature

Added support for hwmon api to fetch out chip temperature
Signed-off-by: Yana Esina <yana.esina@aquantia.com>
Signed-off-by: Nikita Danilov <nikita.danilov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/Makefile

@@ -36,6 +36,7 @@ atlantic-objs := aq_main.o \
 	aq_ring.o \
 	aq_hw_utils.o \
 	aq_ethtool.o \
+	aq_drvinfo.o \
 	aq_filters.o \
 	hw_atl/hw_atl_a0.o \
 	hw_atl/hw_atl_b0.o \

drivers/net/ethernet/aquantia/atlantic/aq_drvinfo.c

+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (C) 2014-2019 aQuantia Corporation. */
+
+/* File aq_drvinfo.c: Definition of common code for firmware info in sys.*/
+
+#include <linux/init.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/hwmon.h>
+#include <linux/uaccess.h>
+
+#include "aq_drvinfo.h"
+
+static int aq_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			 u32 attr, int channel, long *value)
+{
+	struct aq_nic_s *aq_nic = dev_get_drvdata(dev);
+	int temp;
+	int err;
+
+	if (!aq_nic)
+		return -EIO;
+
+	if (type != hwmon_temp)
+		return -EOPNOTSUPP;
+
+	if (!aq_nic->aq_fw_ops->get_phy_temp)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		err = aq_nic->aq_fw_ops->get_phy_temp(aq_nic->aq_hw, &temp);
+		*value = temp;
+		return err;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int aq_hwmon_read_string(struct device *dev,
+				enum hwmon_sensor_types type,
+				u32 attr, int channel, const char **str)
+{
+	struct aq_nic_s *aq_nic = dev_get_drvdata(dev);
+
+	if (!aq_nic)
+		return -EIO;
+
+	if (type != hwmon_temp)
+		return -EOPNOTSUPP;
+
+	if (!aq_nic->aq_fw_ops->get_phy_temp)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_temp_label:
+		*str = "PHY Temperature";
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t aq_hwmon_is_visible(const void *data,
+				   enum hwmon_sensor_types type,
+				   u32 attr, int channel)
+{
+	if (type != hwmon_temp)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_input:
+	case hwmon_temp_label:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static const struct hwmon_ops aq_hwmon_ops = {
+	.is_visible = aq_hwmon_is_visible,
+	.read = aq_hwmon_read,
+	.read_string = aq_hwmon_read_string,
+};
+
+static u32 aq_hwmon_temp_config[] = {
+	HWMON_T_INPUT | HWMON_T_LABEL,
+	0,
+};
+
+static const struct hwmon_channel_info aq_hwmon_temp = {
+	.type = hwmon_temp,
+	.config = aq_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *aq_hwmon_info[] = {
+	&aq_hwmon_temp,
+	NULL,
+};
+
+static const struct hwmon_chip_info aq_hwmon_chip_info = {
+	.ops = &aq_hwmon_ops,
+	.info = aq_hwmon_info,
+};
+
+int aq_drvinfo_init(struct net_device *ndev)
+{
+	struct aq_nic_s *aq_nic = netdev_priv(ndev);
+	struct device *dev = &aq_nic->pdev->dev;
+	struct device *hwmon_dev;
+	int err = 0;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev,
+							 ndev->name,
+							 aq_nic,
+							 &aq_hwmon_chip_info,
+							 NULL);
+
+	if (IS_ERR(hwmon_dev))
+		err = PTR_ERR(hwmon_dev);
+
+	return err;
+}

drivers/net/ethernet/aquantia/atlantic/aq_drvinfo.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2014-2017 aQuantia Corporation. */
+
+/* File aq_drvinfo.h: Declaration of common code for firmware info in sys.*/
+
+#ifndef AQ_DRVINFO_H
+#define AQ_DRVINFO_H
+
+#include "aq_nic.h"
+#include "aq_hw.h"
+#include "hw_atl/hw_atl_utils.h"
+
+int aq_drvinfo_init(struct net_device *ndev);
+
+#endif /* AQ_DRVINFO_H */

drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c

@@ -20,6 +20,7 @@
 #include "hw_atl/hw_atl_a0.h"
 #include "hw_atl/hw_atl_b0.h"
 #include "aq_filters.h"
+#include "aq_drvinfo.h"
 
 static const struct pci_device_id aq_pci_tbl[] = {
 	{ PCI_VDEVICE(AQUANTIA, AQ_DEVICE_ID_0001), },
@@ -289,6 +290,8 @@ static int aq_pci_probe(struct pci_dev *pdev,
 	if (err < 0)
 		goto err_register;
 
+	aq_drvinfo_init(ndev);
+
 	return 0;
 
 err_register: