lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1468576754-3273-5-git-send-email-quentin.schulz@free-electrons.com>
Date:	Fri, 15 Jul 2016 11:59:14 +0200
From:	Quentin Schulz <quentin.schulz@...e-electrons.com>
To:	jdelvare@...e.com, linux@...ck-us.net, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	maxime.ripard@...e-electrons.com, wens@...e.org,
	lee.jones@...aro.org
Cc:	Quentin Schulz <quentin.schulz@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	thomas.petazzoni@...e-electrons.com,
	antoine.tenart@...e-electrons.com
Subject: [PATCH v2 4/4] hwmon: iio: add label for channels read by iio_hwmon

Currently, iio_hwmon only exposes values of the IIO channels it can read
but no label by channel is exposed.

This adds exposition of sysfs files containing label for IIO channels it
can read based on extended_name field of the iio_chan_spec of the channel.
If the extended_name field is empty, the sysfs file is not created by
iio_hwmon.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---

patch added in v2

 drivers/hwmon/iio_hwmon.c | 77 +++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 68 insertions(+), 9 deletions(-)

diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
index c0da4d9..28d15b2 100644
--- a/drivers/hwmon/iio_hwmon.c
+++ b/drivers/hwmon/iio_hwmon.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/iio/consumer.h>
+#include <linux/iio/iio.h>
 #include <linux/iio/types.h>
 
 /**
@@ -57,12 +58,26 @@ static ssize_t iio_hwmon_read_val(struct device *dev,
 	return sprintf(buf, "%d\n", result);
 }
 
+static ssize_t iio_hwmon_read_label(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+	struct iio_hwmon_state *state = dev_get_drvdata(dev);
+	const char *label = state->channels[sattr->index].channel->extend_name;
+
+	if (label)
+		return sprintf(buf, "%s\n", label);
+
+	return 0;
+}
+
 static int iio_hwmon_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct iio_hwmon_state *st;
-	struct sensor_device_attribute *a;
-	int ret, i;
+	struct sensor_device_attribute *a, *b;
+	int ret, i, j = 0;
 	int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1;
 	enum iio_chan_type type;
 	struct iio_channel *channels;
@@ -92,7 +107,8 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 		st->num_channels++;
 
 	st->attrs = devm_kzalloc(dev,
-				 sizeof(*st->attrs) * (st->num_channels + 1),
+				 sizeof(*st->attrs) *
+				 (2 * st->num_channels + 1),
 				 GFP_KERNEL);
 	if (st->attrs == NULL) {
 		ret = -ENOMEM;
@@ -107,6 +123,18 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 		}
 
 		sysfs_attr_init(&a->dev_attr.attr);
+
+		b = NULL;
+		if (st->channels[i].channel->extend_name) {
+			b = devm_kzalloc(dev, sizeof(*b), GFP_KERNEL);
+			if (b == NULL) {
+				ret = -ENOMEM;
+				goto error_release_channels;
+			}
+
+			sysfs_attr_init(&b->dev_attr.attr);
+		}
+
 		ret = iio_get_channel_type(&st->channels[i], &type);
 		if (ret < 0)
 			goto error_release_channels;
@@ -115,35 +143,66 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 		case IIO_VOLTAGE:
 			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
 							  "in%d_input",
-							  in_i++);
+							  in_i);
+			if (b)
+				b->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+								  "in%d_label",
+								  in_i);
+			in_i++;
 			break;
 		case IIO_TEMP:
 			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
 							  "temp%d_input",
-							  temp_i++);
+							  temp_i);
+
+			if (b)
+				b->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+								  "temp%d_label",
+								  temp_i);
+			temp_i++;
 			break;
 		case IIO_CURRENT:
 			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
 							  "curr%d_input",
-							  curr_i++);
+							  curr_i);
+
+			if (b)
+				b->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+								  "curr%d_label",
+								  curr_i);
+			curr_i++;
 			break;
 		case IIO_HUMIDITYRELATIVE:
 			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
 							  "humidity%d_input",
-							  humidity_i++);
+							  humidity_i);
+
+			if (b)
+				b->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+								  "humidity%d_label",
+								  humidity_i);
+			humidity_i++;
 			break;
 		default:
 			ret = -EINVAL;
 			goto error_release_channels;
 		}
-		if (a->dev_attr.attr.name == NULL) {
+		if (a->dev_attr.attr.name == NULL ||
+		    (b && b->dev_attr.attr.name == NULL)) {
 			ret = -ENOMEM;
 			goto error_release_channels;
 		}
 		a->dev_attr.show = iio_hwmon_read_val;
 		a->dev_attr.attr.mode = S_IRUGO;
 		a->index = i;
-		st->attrs[i] = &a->dev_attr.attr;
+		st->attrs[j++] = &a->dev_attr.attr;
+
+		if (b) {
+			b->dev_attr.show = iio_hwmon_read_label;
+			b->dev_attr.attr.mode = S_IRUGO;
+			b->index = i;
+			st->attrs[j++] = &b->dev_attr.attr;
+		}
 	}
 
 	st->attr_group.attrs = st->attrs;
-- 
2.5.0

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ