projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 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. */ | |
| 97 | #define v4l2_device_call_all(dev, grp_id, o, f, args...) \ | |
| 98 | __v4l2_device_call_subdevs(dev, \ | |
| 99 | !(grp_id) || sd->grp_id == (grp_id), o, f , ##args) | |
| 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. */ | |
| 105 | #define v4l2_device_call_until_err(dev, grp_id, o, f, args...) \ | |
| 106 | __v4l2_device_call_subdevs_until_err(dev, \ | |
| 107 | !(grp_id) || sd->grp_id == (grp_id), o, f , ##args) | |
| 108 | ||
| 109 | #endif |