1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ice/ice_hwmon.c b/drivers/net/ethernet/intel/ice/ice_hwmon.c
new file mode 100644
index 0000000000..e4c2c1bff6
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_hwmon.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2023, Intel Corporation. */
+
+#include "ice.h"
+#include "ice_hwmon.h"
+#include "ice_adminq_cmd.h"
+
+#include <linux/hwmon.h>
+
+#define TEMP_FROM_REG(reg) ((reg) * 1000)
+
+static const struct hwmon_channel_info *ice_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_MAX |
+			   HWMON_T_CRIT | HWMON_T_EMERGENCY),
+	NULL
+};
+
+static int ice_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			  u32 attr, int channel, long *val)
+{
+	struct ice_aqc_get_sensor_reading_resp resp;
+	struct ice_pf *pf = dev_get_drvdata(dev);
+	int ret;
+
+	if (type != hwmon_temp)
+		return -EOPNOTSUPP;
+
+	ret = ice_aq_get_sensor_reading(&pf->hw, &resp);
+	if (ret) {
+		dev_warn_ratelimited(dev,
+				     "%s HW read failure (%d)\n",
+				     __func__,
+				     ret);
+		return ret;
+	}
+
+	switch (attr) {
+	case hwmon_temp_input:
+		*val = TEMP_FROM_REG(resp.data.s0f0.temp);
+		break;
+	case hwmon_temp_max:
+		*val = TEMP_FROM_REG(resp.data.s0f0.temp_warning_threshold);
+		break;
+	case hwmon_temp_crit:
+		*val = TEMP_FROM_REG(resp.data.s0f0.temp_critical_threshold);
+		break;
+	case hwmon_temp_emergency:
+		*val = TEMP_FROM_REG(resp.data.s0f0.temp_fatal_threshold);
+		break;
+	default:
+		dev_dbg(dev, "%s unsupported attribute (%d)\n",
+			__func__, attr);
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static umode_t ice_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_crit:
+	case hwmon_temp_max:
+	case hwmon_temp_emergency:
+		return 0444;
+	}
+
+	return 0;
+}
+
+static const struct hwmon_ops ice_hwmon_ops = {
+	.is_visible = ice_hwmon_is_visible,
+	.read = ice_hwmon_read
+};
+
+static const struct hwmon_chip_info ice_chip_info = {
+	.ops = &ice_hwmon_ops,
+	.info = ice_hwmon_info
+};
+
+static bool ice_is_internal_reading_supported(struct ice_pf *pf)
+{
+	/* Only the first PF will report temperature for a chip.
+	 * Note that internal temp reading is not supported
+	 * for older FW (< v4.30).
+	 */
+	if (pf->hw.pf_id)
+		return false;
+
+	unsigned long sensors = pf->hw.dev_caps.supported_sensors;
+
+	return _test_bit(ICE_SENSOR_SUPPORT_E810_INT_TEMP_BIT, &sensors);
+};
+
+void ice_hwmon_init(struct ice_pf *pf)
+{
+	struct device *dev = ice_pf_to_dev(pf);
+	struct device *hdev;
+
+	if (!ice_is_internal_reading_supported(pf))
+		return;
+
+	hdev = hwmon_device_register_with_info(dev, "ice", pf, &ice_chip_info,
+					       NULL);
+	if (IS_ERR(hdev)) {
+		dev_warn(dev,
+			 "hwmon_device_register_with_info returns error (%ld)",
+			 PTR_ERR(hdev));
+		return;
+	}
+	pf->hwmon_dev = hdev;
+}
+
+void ice_hwmon_exit(struct ice_pf *pf)
+{
+	if (!pf->hwmon_dev)
+		return;
+	hwmon_device_unregister(pf->hwmon_dev);
+}