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Diffstat (limited to 'include/media/v4l2-async.h')
| -rw-r--r-- | include/media/v4l2-async.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h new file mode 100644 index 00000000000..c3ec6ac75f7 --- /dev/null +++ b/include/media/v4l2-async.h @@ -0,0 +1,105 @@ +/* + * V4L2 asynchronous subdevice registration API + * + * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef V4L2_ASYNC_H +#define V4L2_ASYNC_H + +#include <linux/list.h> +#include <linux/mutex.h> + +struct device; +struct v4l2_device; +struct v4l2_subdev; +struct v4l2_async_notifier; + +/* A random max subdevice number, used to allocate an array on stack */ +#define V4L2_MAX_SUBDEVS 128U + +enum v4l2_async_bus_type { + V4L2_ASYNC_BUS_CUSTOM, + V4L2_ASYNC_BUS_PLATFORM, + V4L2_ASYNC_BUS_I2C, +}; + +/** + * struct v4l2_async_subdev - sub-device descriptor, as known to a bridge + * @bus_type: subdevice bus type to select the appropriate matching method + * @match: union of per-bus type matching data sets + * @list: used to link struct v4l2_async_subdev objects, waiting to be + * probed, to a notifier->waiting list + */ +struct v4l2_async_subdev { + enum v4l2_async_bus_type bus_type; + union { + struct { + const char *name; + } platform; + struct { + int adapter_id; + unsigned short address; + } i2c; + struct { + bool (*match)(struct device *, + struct v4l2_async_subdev *); + void *priv; + } custom; + } match; + + /* v4l2-async core private: not to be used by drivers */ + struct list_head list; +}; + +/** + * v4l2_async_subdev_list - provided by subdevices + * @list: links struct v4l2_async_subdev_list objects to a global list + * before probing, and onto notifier->done after probing + * @asd: pointer to respective struct v4l2_async_subdev + * @notifier: pointer to managing notifier + */ +struct v4l2_async_subdev_list { + struct list_head list; + struct v4l2_async_subdev *asd; + struct v4l2_async_notifier *notifier; +}; + +/** + * v4l2_async_notifier - v4l2_device notifier data + * @num_subdevs:number of subdevices + * @subdev: array of pointers to subdevice descriptors + * @v4l2_dev: pointer to struct v4l2_device + * @waiting: list of struct v4l2_async_subdev, waiting for their drivers + * @done: list of struct v4l2_async_subdev_list, already probed + * @list: member in a global list of notifiers + * @bound: a subdevice driver has successfully probed one of subdevices + * @complete: all subdevices have been probed successfully + * @unbind: a subdevice is leaving + */ +struct v4l2_async_notifier { + unsigned int num_subdevs; + struct v4l2_async_subdev **subdev; + struct v4l2_device *v4l2_dev; + struct list_head waiting; + struct list_head done; + struct list_head list; + int (*bound)(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd); + int (*complete)(struct v4l2_async_notifier *notifier); + void (*unbind)(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd); +}; + +int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev, + struct v4l2_async_notifier *notifier); +void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier); +int v4l2_async_register_subdev(struct v4l2_subdev *sd); +void v4l2_async_unregister_subdev(struct v4l2_subdev *sd); +#endif |