hwmon: (scmi) port driver to the new scmi_sensor_proto_ops interface

Port the scmi hwmon driver to the new SCMI sensor interface based on
protocol handles and common devm_get_ops().

Link: https://lore.kernel.org/r/20210316124903.35011-25-cristian.marussi@arm.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jean Delvare <jdelvare@suse.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/hwmon/scmi-hwmon.c

@@ -2,7 +2,7 @@
 /*
  * System Control and Management Interface(SCMI) based hwmon sensor driver
  *
- * Copyright (C) 2018 ARM Ltd.
+ * Copyright (C) 2018-2021 ARM Ltd.
  * Sudeep Holla <sudeep.holla@arm.com>
  */
 
@@ -13,8 +13,10 @@
 #include <linux/sysfs.h>
 #include <linux/thermal.h>
 
+static const struct scmi_sensor_proto_ops *sensor_ops;
+
 struct scmi_sensors {
-	const struct scmi_handle *handle;
+	const struct scmi_protocol_handle *ph;
 	const struct scmi_sensor_info **info[hwmon_max];
 };
 
@@ -69,10 +71,9 @@ static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 	u64 value;
 	const struct scmi_sensor_info *sensor;
 	struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
-	const struct scmi_handle *h = scmi_sensors->handle;
 
 	sensor = *(scmi_sensors->info[type] + channel);
-	ret = h->sensor_ops->reading_get(h, sensor->id, &value);
+	ret = sensor_ops->reading_get(scmi_sensors->ph, sensor->id, &value);
 	if (ret)
 		return ret;
 
@@ -169,11 +170,16 @@ static int scmi_hwmon_probe(struct scmi_device *sdev)
 	struct hwmon_channel_info *scmi_hwmon_chan;
 	const struct hwmon_channel_info **ptr_scmi_ci;
 	const struct scmi_handle *handle = sdev->handle;
+	struct scmi_protocol_handle *ph;
 
-	if (!handle || !handle->sensor_ops)
+	if (!handle)
 		return -ENODEV;
 
-	nr_sensors = handle->sensor_ops->count_get(handle);
+	sensor_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_SENSOR, &ph);
+	if (IS_ERR(sensor_ops))
+		return PTR_ERR(sensor_ops);
+
+	nr_sensors = sensor_ops->count_get(ph);
 	if (!nr_sensors)
 		return -EIO;
 
@@ -181,10 +187,10 @@ static int scmi_hwmon_probe(struct scmi_device *sdev)
 	if (!scmi_sensors)
 		return -ENOMEM;
 
-	scmi_sensors->handle = handle;
+	scmi_sensors->ph = ph;
 
 	for (i = 0; i < nr_sensors; i++) {
-		sensor = handle->sensor_ops->info_get(handle, i);
+		sensor = sensor_ops->info_get(ph, i);
 		if (!sensor)
 			return -EINVAL;
 
@@ -236,7 +242,7 @@ static int scmi_hwmon_probe(struct scmi_device *sdev)
 	}
 
 	for (i = nr_sensors - 1; i >= 0 ; i--) {
-		sensor = handle->sensor_ops->info_get(handle, i);
+		sensor = sensor_ops->info_get(ph, i);
 		if (!sensor)
 			continue;