On Mon, Sep 11, 2017 at 11:47:11AM +0200, Hans Verkuil wrote:
> 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.
I'll add that, plus a note to v4l2_async_notifier_release() as well.
--
Sakari Ailus
e-mail: sakari.ailus@xxxxxx
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