[PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references
From: Sakari Ailus <hidden>
Date: 2017-09-12 13:41:52
Also in:
linux-media
Subsystem:
media input infrastructure (v4l/dvb), the rest, v4l2 async and fwnode frameworks · Maintainers:
Mauro Carvalho Chehab, Linus Torvalds, Sakari Ailus
Possibly related (same subject, not in this thread)
- 2017-09-15 · Re: [PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references · Sakari Ailus <sakari.ailus@iki.fi>
- 2017-09-13 · Re: [PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references · Hans Verkuil <hidden>
- 2017-09-13 · Re: [PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references · Sakari Ailus <sakari.ailus@iki.fi>
- 2017-09-13 · Re: [PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references · Hans Verkuil <hidden>
- 2017-09-13 · Re: [PATCH v12 18/26] v4l: fwnode: Add a helper function for parsing generic references · Sakari Ailus <hidden>
Add function v4l2_fwnode_reference_count() for counting external references and 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. struct v4l2_async_notifier.max_subdevs field is added to contain the maximum number of sub-devices in a notifier to reflect the memory allocated for the subdevs array. Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> --- drivers/media/v4l2-core/v4l2-fwnode.c | 69 +++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 44ee35f6aad5..a32473f95be1 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c@@ -498,6 +498,75 @@ 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; + + /* + * To-do: handle -ENODATA when "device property: Align return + * codes of acpi_fwnode_get_reference_with_args" is merged. + */ + 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-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>"); MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
--
2.11.0
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