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media: v4l: fwnode: Add a helper function for parsing generic references

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Add function v4l2_fwnode_reference_parse() for parsing them as async
sub-devices. This can be done on e.g. flash or lens async sub-devices that
are not part of but are associated with a sensor.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
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 2017-06-20 07:47:24 -04:00 committed by Mauro Carvalho Chehab
parent baf249e40f
commit d84285390f
1 changed files with 69 additions and 0 deletions
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69
drivers/media/v4l2-core/v4l2-fwnode.c
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@ -509,6 +509,75 @@ int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
}
EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints_by_port);
/*
* v4l2_fwnode_reference_parse - parse references 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
* @prop: the name of the property
*
* Return: 0 on success
* -ENOENT if no entries were found
* -ENOMEM if memory allocation failed
* -EINVAL if property parsing failed
*/
static int v4l2_fwnode_reference_parse(
struct device *dev, struct v4l2_async_notifier *notifier,
const char *prop)
{
struct fwnode_reference_args args;
unsigned int index;
int ret;
for (index = 0;
!(ret = fwnode_property_get_reference_args(
dev_fwnode(dev), prop, NULL, 0, index, &args));
index++)
fwnode_handle_put(args.fwnode);
if (!index)
return -ENOENT;
/*
* Note that right now both -ENODATA and -ENOENT may signal
* out-of-bounds access. Return the error in cases other than that.
*/
if (ret != -ENOENT && ret != -ENODATA)
return ret;
ret = v4l2_async_notifier_realloc(notifier,
notifier->num_subdevs + index);
if (ret)
return ret;
for (index = 0; !fwnode_property_get_reference_args(
dev_fwnode(dev), prop, NULL, 0, index, &args);
index++) {
struct v4l2_async_subdev *asd;
if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) {
ret = -EINVAL;
goto error;
}
asd = kzalloc(sizeof(*asd), GFP_KERNEL);
if (!asd) {
ret = -ENOMEM;
goto error;
}
notifier->subdevs[notifier->num_subdevs] = asd;
asd->match.fwnode.fwnode = args.fwnode;
asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
notifier->num_subdevs++;
}
return 0;
error:
fwnode_handle_put(args.fwnode);
return ret;
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");