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1 | /* |
2 | V4L2 device support header. | |
3 | ||
4 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> | |
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 as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #ifndef _V4L2_DEVICE_H | |
22 | #define _V4L2_DEVICE_H | |
23 | ||
24 | #include <media/v4l2-subdev.h> | |
25 | ||
26 | /* Each instance of a V4L2 device should create the v4l2_device struct, | |
27 | either stand-alone or embedded in a larger struct. | |
28 | ||
29 | It allows easy access to sub-devices (see v4l2-subdev.h) and provides | |
30 | basic V4L2 device-level support. | |
31 | */ | |
32 | ||
33 | #define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16) | |
34 | ||
35 | struct v4l2_device { | |
36 | /* dev->driver_data points to this struct */ | |
37 | struct device *dev; | |
38 | /* used to keep track of the registered subdevs */ | |
39 | struct list_head subdevs; | |
40 | /* lock this struct; can be used by the driver as well if this | |
41 | struct is embedded into a larger struct. */ | |
42 | spinlock_t lock; | |
43 | /* unique device name, by default the driver name + bus ID */ | |
44 | char name[V4L2_DEVICE_NAME_SIZE]; | |
45 | }; | |
46 | ||
47 | /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev */ | |
48 | int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); | |
49 | /* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */ | |
50 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); | |
51 | ||
52 | /* Register a subdev with a v4l2 device. While registered the subdev module | |
53 | is marked as in-use. An error is returned if the module is no longer | |
54 | loaded when you attempt to register it. */ | |
55 | int __must_check v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd); | |
56 | /* Unregister a subdev with a v4l2 device. Can also be called if the subdev | |
57 | wasn't registered. In that case it will do nothing. */ | |
58 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); | |
59 | ||
60 | /* Iterate over all subdevs. */ | |
61 | #define v4l2_device_for_each_subdev(sd, dev) \ | |
62 | list_for_each_entry(sd, &(dev)->subdevs, list) | |
63 | ||
64 | /* Call the specified callback for all subdevs matching the condition. | |
65 | Ignore any errors. Note that you cannot add or delete a subdev | |
66 | while walking the subdevs list. */ | |
67 | #define __v4l2_device_call_subdevs(dev, cond, o, f, args...) \ | |
68 | do { \ | |
69 | struct v4l2_subdev *sd; \ | |
70 | \ | |
71 | list_for_each_entry(sd, &(dev)->subdevs, list) \ | |
72 | if ((cond) && sd->ops->o && sd->ops->o->f) \ | |
73 | sd->ops->o->f(sd , ##args); \ | |
74 | } while (0) | |
75 | ||
76 | /* Call the specified callback for all subdevs matching the condition. | |
77 | If the callback returns an error other than 0 or -ENOIOCTLCMD, then | |
78 | return with that error code. Note that you cannot add or delete a | |
79 | subdev while walking the subdevs list. */ | |
80 | #define __v4l2_device_call_subdevs_until_err(dev, cond, o, f, args...) \ | |
81 | ({ \ | |
82 | struct v4l2_subdev *sd; \ | |
069b7479 | 83 | long err = 0; \ |
2a1fcdf0 HV |
84 | \ |
85 | list_for_each_entry(sd, &(dev)->subdevs, list) { \ | |
86 | if ((cond) && sd->ops->o && sd->ops->o->f) \ | |
87 | err = sd->ops->o->f(sd , ##args); \ | |
88 | if (err && err != -ENOIOCTLCMD) \ | |
89 | break; \ | |
90 | } \ | |
91 | (err == -ENOIOCTLCMD) ? 0 : err; \ | |
92 | }) | |
93 | ||
94 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | |
95 | match them all). Ignore any errors. Note that you cannot add or delete | |
96 | a subdev while walking the subdevs list. */ | |
f9129a2e | 97 | #define v4l2_device_call_all(dev, grpid, o, f, args...) \ |
2a1fcdf0 | 98 | __v4l2_device_call_subdevs(dev, \ |
f9129a2e | 99 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
2a1fcdf0 HV |
100 | |
101 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | |
102 | match them all). If the callback returns an error other than 0 or | |
103 | -ENOIOCTLCMD, then return with that error code. Note that you cannot | |
104 | add or delete a subdev while walking the subdevs list. */ | |
f9129a2e | 105 | #define v4l2_device_call_until_err(dev, grpid, o, f, args...) \ |
2a1fcdf0 | 106 | __v4l2_device_call_subdevs_until_err(dev, \ |
f9129a2e | 107 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
2a1fcdf0 HV |
108 | |
109 | #endif |