add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/hwmon/iio_hwmon.c
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@@ -1,10 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* Hwmon client for industrial I/O devices
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  *
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  * Copyright (c) 2011 Jonathan Cameron
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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  */
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 #include <linux/kernel.h>
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@@ -47,11 +44,19 @@
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 	int ret;
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 	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
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 	struct iio_hwmon_state *state = dev_get_drvdata(dev);
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+	struct iio_channel *chan = &state->channels[sattr->index];
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+	enum iio_chan_type type;
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-	ret = iio_read_channel_processed(&state->channels[sattr->index],
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-					&result);
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+	ret = iio_read_channel_processed(chan, &result);
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 	if (ret < 0)
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 		return ret;
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+
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+	ret = iio_get_channel_type(chan, &type);
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+	if (ret < 0)
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+		return ret;
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+
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+	if (type == IIO_POWER)
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+		result *= 1000; /* mili-Watts to micro-Watts conversion */
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 	return sprintf(buf, "%d\n", result);
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 }
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@@ -62,15 +67,11 @@
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 	struct iio_hwmon_state *st;
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 	struct sensor_device_attribute *a;
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 	int ret, i;
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-	int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1;
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+	int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1, power_i = 1;
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 	enum iio_chan_type type;
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 	struct iio_channel *channels;
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-	const char *name = "iio_hwmon";
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 	struct device *hwmon_dev;
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 	char *sname;
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-
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-	if (dev->of_node && dev->of_node->name)
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-		name = dev->of_node->name;
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 	channels = devm_iio_channel_get_all(dev);
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 	if (IS_ERR(channels)) {
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@@ -96,6 +97,9 @@
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 		return -ENOMEM;
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 	for (i = 0; i < st->num_channels; i++) {
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+		const char *prefix;
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+		int n;
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+
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 		a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
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 		if (a == NULL)
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 			return -ENOMEM;
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@@ -107,33 +111,37 @@
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 		switch (type) {
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 		case IIO_VOLTAGE:
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-			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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-							       "in%d_input",
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-							       in_i++);
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+			n = in_i++;
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+			prefix = "in";
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 			break;
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 		case IIO_TEMP:
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-			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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-							       "temp%d_input",
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-							       temp_i++);
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+			n = temp_i++;
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+			prefix = "temp";
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 			break;
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 		case IIO_CURRENT:
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-			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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-							       "curr%d_input",
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-							       curr_i++);
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+			n = curr_i++;
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+			prefix = "curr";
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+			break;
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+		case IIO_POWER:
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+			n = power_i++;
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+			prefix = "power";
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 			break;
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 		case IIO_HUMIDITYRELATIVE:
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-			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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-							       "humidity%d_input",
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-							       humidity_i++);
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+			n = humidity_i++;
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+			prefix = "humidity";
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 			break;
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 		default:
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 			return -EINVAL;
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 		}
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+
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+		a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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+						       "%s%d_input",
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+						       prefix, n);
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 		if (a->dev_attr.attr.name == NULL)
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 			return -ENOMEM;
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 		a->dev_attr.show = iio_hwmon_read_val;
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-		a->dev_attr.attr.mode = S_IRUGO;
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+		a->dev_attr.attr.mode = 0444;
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 		a->index = i;
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 		st->attrs[i] = &a->dev_attr.attr;
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 	}
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@@ -141,11 +149,15 @@
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 	st->attr_group.attrs = st->attrs;
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 	st->groups[0] = &st->attr_group;
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-	sname = devm_kstrdup(dev, name, GFP_KERNEL);
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-	if (!sname)
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-		return -ENOMEM;
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+	if (dev->of_node) {
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+		sname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
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+		if (!sname)
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+			return -ENOMEM;
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+		strreplace(sname, '-', '_');
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+	} else {
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+		sname = "iio_hwmon";
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+	}
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-	strreplace(sname, '-', '_');
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 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
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 							   st->groups);
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 	return PTR_ERR_OR_ZERO(hwmon_dev);