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2a1fcdf0 HV |
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 | ||
1351a58c | 33 | #define V4L2_DEVICE_NAME_SIZE (20 + 16) |
2a1fcdf0 HV |
34 | |
35 | struct v4l2_device { | |
3a63e449 HV |
36 | /* dev->driver_data points to this struct. |
37 | Note: dev might be NULL if there is no parent device | |
38 | as is the case with e.g. ISA devices. */ | |
2a1fcdf0 HV |
39 | struct device *dev; |
40 | /* used to keep track of the registered subdevs */ | |
41 | struct list_head subdevs; | |
42 | /* lock this struct; can be used by the driver as well if this | |
43 | struct is embedded into a larger struct. */ | |
44 | spinlock_t lock; | |
45 | /* unique device name, by default the driver name + bus ID */ | |
46 | char name[V4L2_DEVICE_NAME_SIZE]; | |
98ec6339 HV |
47 | /* notify callback called by some sub-devices. */ |
48 | void (*notify)(struct v4l2_subdev *sd, | |
49 | unsigned int notification, void *arg); | |
2a1fcdf0 HV |
50 | }; |
51 | ||
3a63e449 HV |
52 | /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev. |
53 | dev may be NULL in rare cases (ISA devices). In that case you | |
54 | must fill in the v4l2_dev->name field before calling this function. */ | |
2a1fcdf0 | 55 | int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev); |
102e7813 HV |
56 | |
57 | /* Optional function to initialize the name field of struct v4l2_device using | |
58 | the driver name and a driver-global atomic_t instance. | |
59 | This function will increment the instance counter and returns the instance | |
60 | value used in the name. | |
61 | ||
62 | Example: | |
63 | ||
64 | static atomic_t drv_instance = ATOMIC_INIT(0); | |
65 | ||
66 | ... | |
67 | ||
68 | instance = v4l2_device_set_name(&v4l2_dev, "foo", &drv_instance); | |
69 | ||
70 | The first time this is called the name field will be set to foo0 and | |
71 | this function returns 0. If the name ends with a digit (e.g. cx18), | |
72 | then the name will be set to cx18-0 since cx180 looks really odd. */ | |
73 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, | |
74 | atomic_t *instance); | |
75 | ||
ae6cfaac HV |
76 | /* Set v4l2_dev->dev to NULL. Call when the USB parent disconnects. |
77 | Since the parent disappears this ensures that v4l2_dev doesn't have an | |
78 | invalid parent pointer. */ | |
79 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev); | |
102e7813 | 80 | |
ae6cfaac | 81 | /* Unregister all sub-devices and any other resources related to v4l2_dev. */ |
2a1fcdf0 HV |
82 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev); |
83 | ||
84 | /* Register a subdev with a v4l2 device. While registered the subdev module | |
85 | is marked as in-use. An error is returned if the module is no longer | |
86 | loaded when you attempt to register it. */ | |
3a63e449 HV |
87 | int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
88 | struct v4l2_subdev *sd); | |
2a1fcdf0 HV |
89 | /* Unregister a subdev with a v4l2 device. Can also be called if the subdev |
90 | wasn't registered. In that case it will do nothing. */ | |
91 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd); | |
92 | ||
93 | /* Iterate over all subdevs. */ | |
3a63e449 HV |
94 | #define v4l2_device_for_each_subdev(sd, v4l2_dev) \ |
95 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) | |
2a1fcdf0 HV |
96 | |
97 | /* Call the specified callback for all subdevs matching the condition. | |
98 | Ignore any errors. Note that you cannot add or delete a subdev | |
99 | while walking the subdevs list. */ | |
3a63e449 | 100 | #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \ |
2a1fcdf0 HV |
101 | do { \ |
102 | struct v4l2_subdev *sd; \ | |
103 | \ | |
3a63e449 | 104 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) \ |
2a1fcdf0 HV |
105 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
106 | sd->ops->o->f(sd , ##args); \ | |
107 | } while (0) | |
108 | ||
109 | /* Call the specified callback for all subdevs matching the condition. | |
110 | If the callback returns an error other than 0 or -ENOIOCTLCMD, then | |
111 | return with that error code. Note that you cannot add or delete a | |
112 | subdev while walking the subdevs list. */ | |
3a63e449 | 113 | #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \ |
2a1fcdf0 HV |
114 | ({ \ |
115 | struct v4l2_subdev *sd; \ | |
069b7479 | 116 | long err = 0; \ |
2a1fcdf0 | 117 | \ |
3a63e449 | 118 | list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) { \ |
2a1fcdf0 HV |
119 | if ((cond) && sd->ops->o && sd->ops->o->f) \ |
120 | err = sd->ops->o->f(sd , ##args); \ | |
121 | if (err && err != -ENOIOCTLCMD) \ | |
122 | break; \ | |
123 | } \ | |
124 | (err == -ENOIOCTLCMD) ? 0 : err; \ | |
125 | }) | |
126 | ||
127 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | |
128 | match them all). Ignore any errors. Note that you cannot add or delete | |
129 | a subdev while walking the subdevs list. */ | |
3a63e449 HV |
130 | #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \ |
131 | __v4l2_device_call_subdevs(v4l2_dev, \ | |
f9129a2e | 132 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
2a1fcdf0 HV |
133 | |
134 | /* Call the specified callback for all subdevs matching grp_id (if 0, then | |
135 | match them all). If the callback returns an error other than 0 or | |
136 | -ENOIOCTLCMD, then return with that error code. Note that you cannot | |
137 | add or delete a subdev while walking the subdevs list. */ | |
3a63e449 HV |
138 | #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \ |
139 | __v4l2_device_call_subdevs_until_err(v4l2_dev, \ | |
f9129a2e | 140 | !(grpid) || sd->grp_id == (grpid), o, f , ##args) |
2a1fcdf0 HV |
141 | |
142 | #endif |