On 09/11/2017 10:00 AM, Sakari Ailus wrote:
> Add v4l2_fwnode_parse_reference_sensor_common for parsing common
> sensor properties that refer to adjacent devices such as flash or lens
> driver chips.
>
> As this is an association only, there's little a regular driver needs to
> know about these devices as such.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-fwnode.c | 35 +++++++++++++++++++++++++++++++++++
> include/media/v4l2-fwnode.h | 13 +++++++++++++
> 2 files changed, 48 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
> index 56eee5bbd3b5..b9e60a0e8f86 100644
> --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> @@ -589,6 +589,41 @@ static int v4l2_fwnode_reference_parse_int_props(
> return ret;
> }
>
> +int v4l2_fwnode_reference_parse_sensor_common(
> + struct device *dev, struct v4l2_async_notifier *notifier)
> +{
> + static const char *led_props[] = { "led" };
> + static const struct {
> + const char *name;
> + const char **props;
> + unsigned int nprops;
> + } props[] = {
> + { "flash-leds", led_props, ARRAY_SIZE(led_props) },
> + { "lens-focus", NULL, 0 },
> + };
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(props); i++) {
> + int ret;
> +
> + if (props[i].props && is_acpi_node(dev_fwnode(dev)))
> + ret = v4l2_fwnode_reference_parse_int_props(
> + dev, notifier, props[i].name,
> + props[i].props, props[i].nprops);
> + else
> + ret = v4l2_fwnode_reference_parse(
> + dev, notifier, props[i].name);
> + if (ret) {
> + dev_warn(dev, "parsing property \"%s\" failed (%d)\n",
> + props[i].name, ret);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_fwnode_reference_parse_sensor_common);
> +
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>");
> MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>");
> diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h
> index 3819a73c3c8a..bcec1ce101dc 100644
> --- a/include/media/v4l2-fwnode.h
> +++ b/include/media/v4l2-fwnode.h
> @@ -257,4 +257,17 @@ int v4l2_async_notifier_parse_fwnode_endpoints(
> struct v4l2_fwnode_endpoint *vep,
> struct v4l2_async_subdev *asd));
>
> +/**
> + * v4l2_fwnode_reference_parse_sensor_common - parse common references on
> + * sensors for async sub-devices
> + * @dev: the device node the properties of which are parsed for references
> + * @notifier: the async notifier where the async subdevs will be added
> + *
I think you should add a note that if this function returns 0 the
caller should remember to call v4l2_async_notifier_release. That is not
immediately obvious.
Regards,
Hans
> + * Return: 0 on success
> + * -ENOMEM if memory allocation failed
> + * -EINVAL if property parsing failed
> + */
> +int v4l2_fwnode_reference_parse_sensor_common(
> + struct device *dev, struct v4l2_async_notifier *notifier);
> +
> #endif /* _V4L2_FWNODE_H */
>
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