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media: v4l: fwnode: Add convenience function for parsing common external refs

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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@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus 2017-09-06 08:35:42 -04:00 committed by Mauro Carvalho Chehab
parent a1699a4e52
commit 7a9ec808ad
3 changed files with 58 additions and 1 deletions
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35
drivers/media/v4l2-core/v4l2-fwnode.c
View File

@ -865,6 +865,41 @@ error:
return ret;
}
int v4l2_async_notifier_parse_fwnode_sensor_common(
struct device *dev, struct v4l2_async_notifier *notifier)
{
static const char * const led_props[] = { "led" };
static const struct {
const char *name;
const char * const *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 && ret != -ENOENT) {
dev_warn(dev, "parsing property \"%s\" failed (%d)\n",
props[i].name, ret);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_sensor_common);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");

3
include/media/v4l2-async.h
View File

@ -156,7 +156,8 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier);
* Release memory resources related to a notifier, including the async
* sub-devices allocated for the purposes of the notifier but not the notifier
* itself. The user is responsible for calling this function to clean up the
* notifier after calling @v4l2_async_notifier_parse_fwnode_endpoints.
* notifier after calling @v4l2_async_notifier_parse_fwnode_endpoints or
* @v4l2_fwnode_reference_parse_sensor_common.
*
* There is no harm from calling v4l2_async_notifier_cleanup in other
* cases as long as its memory has been zeroed after it has been

21
include/media/v4l2-fwnode.h
View File

@ -319,4 +319,25 @@ int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
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
*
* Parse common sensor properties for remote devices related to the
* sensor and set up async sub-devices for them.
*
* Any notifier populated using this function must be released with a call to
* v4l2_async_notifier_release() after it has been unregistered and the async
* sub-devices are no longer in use, even in the case the function returned an
* error.
*
* Return: 0 on success
* -ENOMEM if memory allocation failed
* -EINVAL if property parsing failed
*/
int v4l2_async_notifier_parse_fwnode_sensor_common(
struct device *dev, struct v4l2_async_notifier *notifier);
#endif /* _V4L2_FWNODE_H */