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authorSakari Ailus <sakari.ailus@iki.fi>2015-06-11 12:18:01 -0700
committerBryan Wu <cooloney@gmail.com>2015-06-15 11:37:05 -0700
commit862176512b55ff177fad008cb45ac7adb192300a (patch)
tree75e9d2b3bb5c5095de6b674b1699d4db21f73b4f
parentaaf2cbca46a569b1ec4c292b03fbe2a0a1217e2f (diff)
v4l: async: Add a pointer to of_node to struct v4l2_subdev, match it
V4L2 async sub-devices are currently matched (OF case) based on the struct device_node pointer in struct device. LED devices may have more than one LED, and in that case the OF node to match is not directly the device's node, but a LED's node. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Bryan Wu <cooloney@gmail.com>
-rw-r--r--drivers/media/v4l2-core/v4l2-async.c39
-rw-r--r--include/media/v4l2-subdev.h2
2 files changed, 29 insertions, 12 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 85a6a34128a8..5bada202b2d3 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -22,10 +22,10 @@
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
-static bool match_i2c(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
#if IS_ENABLED(CONFIG_I2C)
- struct i2c_client *client = i2c_verify_client(dev);
+ struct i2c_client *client = i2c_verify_client(sd->dev);
return client &&
asd->match.i2c.adapter_id == client->adapter->nr &&
asd->match.i2c.address == client->addr;
@@ -34,14 +34,24 @@ static bool match_i2c(struct device *dev, struct v4l2_async_subdev *asd)
#endif
}
-static bool match_devname(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_devname(struct v4l2_subdev *sd,
+ struct v4l2_async_subdev *asd)
{
- return !strcmp(asd->match.device_name.name, dev_name(dev));
+ return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
}
-static bool match_of(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
- return dev->of_node == asd->match.of.node;
+ return sd->of_node == asd->match.of.node;
+}
+
+static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
+{
+ if (!asd->match.custom.match)
+ /* Match always */
+ return true;
+
+ return asd->match.custom.match(sd->dev, asd);
}
static LIST_HEAD(subdev_list);
@@ -51,17 +61,14 @@ static DEFINE_MUTEX(list_lock);
static struct v4l2_async_subdev *v4l2_async_belongs(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd)
{
+ bool (*match)(struct v4l2_subdev *, struct v4l2_async_subdev *);
struct v4l2_async_subdev *asd;
- bool (*match)(struct device *, struct v4l2_async_subdev *);
list_for_each_entry(asd, &notifier->waiting, list) {
/* bus_type has been verified valid before */
switch (asd->match_type) {
case V4L2_ASYNC_MATCH_CUSTOM:
- match = asd->match.custom.match;
- if (!match)
- /* Match always */
- return asd;
+ match = match_custom;
break;
case V4L2_ASYNC_MATCH_DEVNAME:
match = match_devname;
@@ -79,7 +86,7 @@ static struct v4l2_async_subdev *v4l2_async_belongs(struct v4l2_async_notifier *
}
/* match cannot be NULL here */
- if (match(sd->dev, asd))
+ if (match(sd, asd))
return asd;
}
@@ -266,6 +273,14 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
{
struct v4l2_async_notifier *notifier;
+ /*
+ * No reference taken. The reference is held by the device
+ * (struct v4l2_subdev.dev), and async sub-device does not
+ * exist independently of the device at any point of time.
+ */
+ if (!sd->of_node && sd->dev)
+ sd->of_node = sd->dev->of_node;
+
mutex_lock(&list_lock);
INIT_LIST_HEAD(&sd->async_list);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 2f0a345a7fed..bf9c7f2169d1 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -619,6 +619,8 @@ struct v4l2_subdev {
struct video_device *devnode;
/* pointer to the physical device, if any */
struct device *dev;
+ /* The device_node of the subdev, usually the same as dev->of_node. */
+ struct device_node *of_node;
/* Links this subdev to a global subdev_list or @notifier->done list. */
struct list_head async_list;
/* Pointer to respective struct v4l2_async_subdev. */