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Message-Id: <1531175957-1973-7-git-send-email-steve_longerbeam@mentor.com>
Date: Mon, 9 Jul 2018 15:39:06 -0700
From: Steve Longerbeam <slongerbeam@...il.com>
To: linux-media@...r.kernel.org
Cc: Steve Longerbeam <steve_longerbeam@...tor.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Sebastian Reichel <sre@...nel.org>,
Hans Verkuil <hans.verkuil@...co.com>,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v6 06/17] media: v4l2-fwnode: Add a convenience function for registering subdevs with notifiers
Adds v4l2_async_register_fwnode_subdev(), which is a convenience function
for parsing a sub-device's fwnode port endpoints for connected remote
sub-devices, registering a sub-device notifier, and then registering
the sub-device itself.
Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
---
Changes since v5:
- add call to v4l2_async_notifier_init().
Changes since v4:
- none
Changes since v3:
- remove support for port sub-devices, such sub-devices will have to
role their own.
Changes since v2:
- fix error-out path in v4l2_async_register_fwnode_subdev() that forgot
to put device.
Changes since v1:
- add #include <media/v4l2-subdev.h> to v4l2-fwnode.h for
'struct v4l2_subdev' declaration.
---
drivers/media/v4l2-core/v4l2-fwnode.c | 64 +++++++++++++++++++++++++++++++++++
include/media/v4l2-fwnode.h | 38 +++++++++++++++++++++
2 files changed, 102 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 67ad333..94d867a 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -872,6 +872,70 @@ int v4l2_async_register_subdev_sensor_common(struct v4l2_subdev *sd)
}
EXPORT_SYMBOL_GPL(v4l2_async_register_subdev_sensor_common);
+int v4l2_async_register_fwnode_subdev(
+ struct v4l2_subdev *sd, size_t asd_struct_size,
+ unsigned int *ports, unsigned int num_ports,
+ int (*parse_endpoint)(struct device *dev,
+ struct v4l2_fwnode_endpoint *vep,
+ struct v4l2_async_subdev *asd))
+{
+ struct v4l2_async_notifier *notifier;
+ struct device *dev = sd->dev;
+ struct fwnode_handle *fwnode;
+ int ret;
+
+ if (WARN_ON(!dev))
+ return -ENODEV;
+
+ fwnode = dev_fwnode(dev);
+ if (!fwnode_device_is_available(fwnode))
+ return -ENODEV;
+
+ notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
+ if (!notifier)
+ return -ENOMEM;
+
+ v4l2_async_notifier_init(notifier);
+
+ if (!ports) {
+ ret = v4l2_async_notifier_parse_fwnode_endpoints(
+ dev, notifier, asd_struct_size, parse_endpoint);
+ if (ret < 0)
+ goto out_cleanup;
+ } else {
+ unsigned int i;
+
+ for (i = 0; i < num_ports; i++) {
+ ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
+ dev, notifier, asd_struct_size,
+ ports[i], parse_endpoint);
+ if (ret < 0)
+ goto out_cleanup;
+ }
+ }
+
+ ret = v4l2_async_subdev_notifier_register(sd, notifier);
+ if (ret < 0)
+ goto out_cleanup;
+
+ ret = v4l2_async_register_subdev(sd);
+ if (ret < 0)
+ goto out_unregister;
+
+ sd->subdev_notifier = notifier;
+
+ return 0;
+
+out_unregister:
+ v4l2_async_notifier_unregister(notifier);
+out_cleanup:
+ v4l2_async_notifier_cleanup(notifier);
+ kfree(notifier);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_async_register_fwnode_subdev);
+
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@...ux.intel.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@...sung.com>");
diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h
index ea7a8b2..031ebb0 100644
--- a/include/media/v4l2-fwnode.h
+++ b/include/media/v4l2-fwnode.h
@@ -23,6 +23,7 @@
#include <linux/types.h>
#include <media/v4l2-mediabus.h>
+#include <media/v4l2-subdev.h>
struct fwnode_handle;
struct v4l2_async_notifier;
@@ -360,4 +361,41 @@ int v4l2_async_notifier_parse_fwnode_endpoints_by_port(
int v4l2_async_notifier_parse_fwnode_sensor_common(
struct device *dev, struct v4l2_async_notifier *notifier);
+/**
+ * v4l2_async_register_fwnode_subdev - registers a sub-device to the
+ * asynchronous sub-device framework
+ * and parses fwnode endpoints
+ *
+ * @sd: pointer to struct &v4l2_subdev
+ * @asd_struct_size: size of the driver's async sub-device struct, including
+ * sizeof(struct v4l2_async_subdev). The &struct
+ * v4l2_async_subdev shall be the first member of
+ * the driver's async sub-device struct, i.e. both
+ * begin at the same memory address.
+ * @ports: array of port id's to parse for fwnode endpoints. If NULL, will
+ * parse all ports owned by the sub-device.
+ * @num_ports: number of ports in @ports array. Ignored if @ports is NULL.
+ * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
+ * endpoint. Optional.
+ *
+ * This function is just like v4l2_async_register_subdev() with the
+ * exception that calling it will also allocate a notifier for the
+ * sub-device, parse the sub-device's firmware node endpoints using
+ * v4l2_async_notifier_parse_fwnode_endpoints() or
+ * v4l2_async_notifier_parse_fwnode_endpoints_by_port(), and
+ * registers the sub-device notifier. The sub-device is similarly
+ * unregistered by calling v4l2_async_unregister_subdev().
+ *
+ * While registered, the subdev module is marked as in-use.
+ *
+ * An error is returned if the module is no longer loaded on any attempts
+ * to register it.
+ */
+int v4l2_async_register_fwnode_subdev(
+ struct v4l2_subdev *sd, size_t asd_struct_size,
+ unsigned int *ports, unsigned int num_ports,
+ int (*parse_endpoint)(struct device *dev,
+ struct v4l2_fwnode_endpoint *vep,
+ struct v4l2_async_subdev *asd));
+
#endif /* _V4L2_FWNODE_H */
--
2.7.4
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