On 27. 08. 19 5:35, Phil Reid wrote:
> If a label is defined in the device tree for this device add that
> to the device specific attributes. This is useful for userspace to
> be able to identify an individual device when multiple identical
> chips are present in the system.
>
> Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
> ---
> drivers/iio/industrialio-core.c | 17 +++++++++++++++++
> include/linux/iio/iio.h | 1 +
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 8303639963d7..2d7fb7629095 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1300,6 +1300,16 @@ static ssize_t iio_show_dev_name(struct device *dev,
>
> static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
>
> +static ssize_t iio_show_dev_label(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
> +}
> +
> +static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
> +
> static ssize_t iio_show_timestamp_clock(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -1416,6 +1426,8 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
>
> if (indio_dev->name)
> attrcount++;
> + if (indio_dev->label)
> + attrcount++;
> if (clk)
> attrcount++;
>
> @@ -1438,6 +1450,8 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
> indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
> if (indio_dev->name)
> indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
> + if (indio_dev->label)
> + indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
> if (clk)
> indio_dev->chan_attr_group.attrs[attrn++] = clk;
>
> @@ -1709,6 +1723,9 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod)
> if (!indio_dev->dev.of_node && indio_dev->dev.parent)
> indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
>
> + indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
> + NULL);
> +
> ret = iio_check_unique_scan_index(indio_dev);
> if (ret < 0)
> return ret;
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index a74cb177dc6f..3f89db50d3f6 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -556,6 +556,7 @@ struct iio_dev {
> struct list_head channel_attr_list;
> struct attribute_group chan_attr_group;
> const char *name;
> + const char *label;
> const struct iio_info *info;
> clockid_t clock_id;
> struct mutex info_exist_lock;
>
Tested-by: Michal Simek <michal.simek@xxxxxxxxxx>
Thanks,
Michal
