projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2a1fcdf0 HV |
1 | /* |
| 2 | V4L2 device support. | |
| 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 | #include <linux/types.h> | |
| 22 | #include <linux/ioctl.h> | |
| 23 | #include <linux/i2c.h> | |
| 24 | #include <linux/videodev2.h> | |
| 25 | #include <media/v4l2-device.h> | |
| 26 | ||
| 27 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) | |
| 28 | { | |
| 29 | if (dev == NULL || v4l2_dev == NULL) | |
| 30 | return -EINVAL; | |
| 31 | /* Warn if we apparently re-register a device */ | |
| 43266337 | 32 | WARN_ON(dev_get_drvdata(dev) != NULL); |
| 2a1fcdf0 HV |
33 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
| 34 | spin_lock_init(&v4l2_dev->lock); | |
| 35 | v4l2_dev->dev = dev; | |
| 36 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", | |
| c3ef01ce | 37 | dev->driver->name, dev_name(dev)); |
| 2a1fcdf0 HV |
38 | dev_set_drvdata(dev, v4l2_dev); |
| 39 | return 0; | |
| 40 | } | |
| 41 | EXPORT_SYMBOL_GPL(v4l2_device_register); | |
| 42 | ||
| 43 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) | |
| 44 | { | |
| 45 | struct v4l2_subdev *sd, *next; | |
| 46 | ||
| 47 | if (v4l2_dev == NULL || v4l2_dev->dev == NULL) | |
| 48 | return; | |
| 49 | dev_set_drvdata(v4l2_dev->dev, NULL); | |
| 50 | /* unregister subdevs */ | |
| 51 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) | |
| 52 | v4l2_device_unregister_subdev(sd); | |
| 53 | ||
| 54 | v4l2_dev->dev = NULL; | |
| 55 | } | |
| 56 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | |
| 57 | ||
| 58 | int v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd) | |
| 59 | { | |
| 60 | /* Check for valid input */ | |
| 61 | if (dev == NULL || sd == NULL || !sd->name[0]) | |
| 62 | return -EINVAL; | |
| 63 | /* Warn if we apparently re-register a subdev */ | |
| 43266337 | 64 | WARN_ON(sd->dev != NULL); |
| 2a1fcdf0 HV |
65 | if (!try_module_get(sd->owner)) |
| 66 | return -ENODEV; | |
| 67 | sd->dev = dev; | |
| 68 | spin_lock(&dev->lock); | |
| 69 | list_add_tail(&sd->list, &dev->subdevs); | |
| 70 | spin_unlock(&dev->lock); | |
| 71 | return 0; | |
| 72 | } | |
| 73 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | |
| 74 | ||
| 75 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) | |
| 76 | { | |
| 77 | /* return if it isn't registered */ | |
| 78 | if (sd == NULL || sd->dev == NULL) | |
| 79 | return; | |
| 80 | spin_lock(&sd->dev->lock); | |
| 81 | list_del(&sd->list); | |
| 82 | spin_unlock(&sd->dev->lock); | |
| 83 | sd->dev = NULL; | |
| 84 | module_put(sd->owner); | |
| 85 | } | |
| 86 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |