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Diffstat (limited to 'include/media/v4l2-device.h')
-rw-r--r--include/media/v4l2-device.h40
1 files changed, 26 insertions, 14 deletions
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 55e41afd95e..0dd3e8e8653 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -33,7 +33,9 @@
#define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16)
struct v4l2_device {
- /* dev->driver_data points to this struct */
+ /* dev->driver_data points to this struct.
+ Note: dev might be NULL if there is no parent device
+ as is the case with e.g. ISA devices. */
struct device *dev;
/* used to keep track of the registered subdevs */
struct list_head subdevs;
@@ -42,33 +44,43 @@ struct v4l2_device {
spinlock_t lock;
/* unique device name, by default the driver name + bus ID */
char name[V4L2_DEVICE_NAME_SIZE];
+ /* notify callback called by some sub-devices. */
+ void (*notify)(struct v4l2_subdev *sd,
+ unsigned int notification, void *arg);
};
-/* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev */
+/* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev.
+ 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);
-/* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */
+/* 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);
/* Register a subdev with a v4l2 device. While registered the subdev module
is marked as in-use. An error is returned if the module is no longer
loaded when you attempt to register it. */
-int __must_check v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd);
+int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
+ struct v4l2_subdev *sd);
/* Unregister a subdev with a v4l2 device. Can also be called if the subdev
wasn't registered. In that case it will do nothing. */
void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
/* Iterate over all subdevs. */
-#define v4l2_device_for_each_subdev(sd, dev) \
- list_for_each_entry(sd, &(dev)->subdevs, list)
+#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
+ list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
/* Call the specified callback for all subdevs matching the condition.
Ignore any errors. Note that you cannot add or delete a subdev
while walking the subdevs list. */
-#define __v4l2_device_call_subdevs(dev, cond, o, f, args...) \
+#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
do { \
struct v4l2_subdev *sd; \
\
- list_for_each_entry(sd, &(dev)->subdevs, list) \
+ list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) \
if ((cond) && sd->ops->o && sd->ops->o->f) \
sd->ops->o->f(sd , ##args); \
} while (0)
@@ -77,12 +89,12 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
If the callback returns an error other than 0 or -ENOIOCTLCMD, then
return with that error code. Note that you cannot add or delete a
subdev while walking the subdevs list. */
-#define __v4l2_device_call_subdevs_until_err(dev, cond, o, f, args...) \
+#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
({ \
struct v4l2_subdev *sd; \
long err = 0; \
\
- list_for_each_entry(sd, &(dev)->subdevs, list) { \
+ list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) { \
if ((cond) && sd->ops->o && sd->ops->o->f) \
err = sd->ops->o->f(sd , ##args); \
if (err && err != -ENOIOCTLCMD) \
@@ -94,16 +106,16 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). Ignore any errors. Note that you cannot add or delete
a subdev while walking the subdevs list. */
-#define v4l2_device_call_all(dev, grpid, o, f, args...) \
- __v4l2_device_call_subdevs(dev, \
+#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
+ __v4l2_device_call_subdevs(v4l2_dev, \
!(grpid) || sd->grp_id == (grpid), o, f , ##args)
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). If the callback returns an error other than 0 or
-ENOIOCTLCMD, then return with that error code. Note that you cannot
add or delete a subdev while walking the subdevs list. */
-#define v4l2_device_call_until_err(dev, grpid, o, f, args...) \
- __v4l2_device_call_subdevs_until_err(dev, \
+#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
+ __v4l2_device_call_subdevs_until_err(v4l2_dev, \
!(grpid) || sd->grp_id == (grpid), o, f , ##args)
#endif