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authorHans Verkuil <hverkuil@xs4all.nl>2009-05-02 17:12:50 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-17 01:20:50 +0400
commit102e78136446faca7d7d241b628c5bd0e0d61d5d (patch)
tree17f26a5fc1aa4bab59d38a80c2684af21e37d53e /include/media
parent416a7aa88300601d6630736836f9798c4079bc16 (diff)
downloadlinux-102e78136446faca7d7d241b628c5bd0e0d61d5d.tar.xz
V4L/DVB (11671): v4l2: add v4l2_device_set_name()
Add a utility function that can be used to setup the v4l2_device's name field in a standard manner. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/v4l2-device.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 9afd39fb2cfc..5d5d550e63ad 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -53,10 +53,31 @@ struct v4l2_device {
dev may be NULL in rare cases (ISA devices). In that case you
must fill in the v4l2_dev->name field before calling this function. */
int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
+
+/* Optional function to initialize the name field of struct v4l2_device using
+ the driver name and a driver-global atomic_t instance.
+ This function will increment the instance counter and returns the instance
+ value used in the name.
+
+ Example:
+
+ static atomic_t drv_instance = ATOMIC_INIT(0);
+
+ ...
+
+ instance = v4l2_device_set_name(&v4l2_dev, "foo", &drv_instance);
+
+ The first time this is called the name field will be set to foo0 and
+ this function returns 0. If the name ends with a digit (e.g. cx18),
+ then the name will be set to cx18-0 since cx180 looks really odd. */
+int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
+ atomic_t *instance);
+
/* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects.
Since the parent disappears this ensures that v4l2_dev doesn't have an
invalid parent pointer. */
void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);
+
/* Unregister all sub-devices and any other resources related to v4l2_dev. */
void v4l2_device_unregister(struct v4l2_device *v4l2_dev);