tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * V4L2 asynchronous subdevice registration API
3 *
4 * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#ifndef V4L2_ASYNC_H
12#define V4L2_ASYNC_H
13
14#include <linux/list.h>
15#include <linux/mutex.h>
16
17struct device;
18struct v4l2_device;
19struct v4l2_subdev;
20struct v4l2_async_notifier;
21
22/* A random max subdevice number, used to allocate an array on stack */
23#define V4L2_MAX_SUBDEVS 128U
24
25enum v4l2_async_bus_type {
26 V4L2_ASYNC_BUS_CUSTOM,
27 V4L2_ASYNC_BUS_PLATFORM,
28 V4L2_ASYNC_BUS_I2C,
29};
30
31/**
32 * struct v4l2_async_subdev - sub-device descriptor, as known to a bridge
33 * @bus_type: subdevice bus type to select the appropriate matching method
34 * @match: union of per-bus type matching data sets
35 * @list: used to link struct v4l2_async_subdev objects, waiting to be
36 * probed, to a notifier->waiting list
37 */
38struct v4l2_async_subdev {
39 enum v4l2_async_bus_type bus_type;
40 union {
41 struct {
42 const char *name;
43 } platform;
44 struct {
45 int adapter_id;
46 unsigned short address;
47 } i2c;
48 struct {
49 bool (*match)(struct device *,
50 struct v4l2_async_subdev *);
51 void *priv;
52 } custom;
53 } match;
54
55 /* v4l2-async core private: not to be used by drivers */
56 struct list_head list;
57};
58
59/**
60 * v4l2_async_subdev_list - provided by subdevices
61 * @list: links struct v4l2_async_subdev_list objects to a global list
62 * before probing, and onto notifier->done after probing
63 * @asd: pointer to respective struct v4l2_async_subdev
64 * @notifier: pointer to managing notifier
65 */
66struct v4l2_async_subdev_list {
67 struct list_head list;
68 struct v4l2_async_subdev *asd;
69 struct v4l2_async_notifier *notifier;
70};
71
72/**
73 * v4l2_async_notifier - v4l2_device notifier data
74 * @num_subdevs:number of subdevices
75 * @subdev: array of pointers to subdevice descriptors
76 * @v4l2_dev: pointer to struct v4l2_device
77 * @waiting: list of struct v4l2_async_subdev, waiting for their drivers
78 * @done: list of struct v4l2_async_subdev_list, already probed
79 * @list: member in a global list of notifiers
80 * @bound: a subdevice driver has successfully probed one of subdevices
81 * @complete: all subdevices have been probed successfully
82 * @unbind: a subdevice is leaving
83 */
84struct v4l2_async_notifier {
85 unsigned int num_subdevs;
86 struct v4l2_async_subdev **subdev;
87 struct v4l2_device *v4l2_dev;
88 struct list_head waiting;
89 struct list_head done;
90 struct list_head list;
91 int (*bound)(struct v4l2_async_notifier *notifier,
92 struct v4l2_subdev *subdev,
93 struct v4l2_async_subdev *asd);
94 int (*complete)(struct v4l2_async_notifier *notifier);
95 void (*unbind)(struct v4l2_async_notifier *notifier,
96 struct v4l2_subdev *subdev,
97 struct v4l2_async_subdev *asd);
98};
99
100int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
101 struct v4l2_async_notifier *notifier);
102void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier);
103int v4l2_async_register_subdev(struct v4l2_subdev *sd);
104void v4l2_async_unregister_subdev(struct v4l2_subdev *sd);
105#endif