Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 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> |
Dmitri Belimov | 85e0921 | 2010-03-23 11:23:29 -0300 | [diff] [blame] | 24 | #if defined(CONFIG_SPI) |
| 25 | #include <linux/spi/spi.h> |
| 26 | #endif |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 27 | #include <linux/videodev2.h> |
| 28 | #include <media/v4l2-device.h> |
Hans Verkuil | 11bbc1c | 2010-05-16 09:24:06 -0300 | [diff] [blame^] | 29 | #include <media/v4l2-ctrls.h> |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 30 | |
| 31 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) |
| 32 | { |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 33 | if (v4l2_dev == NULL) |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 34 | return -EINVAL; |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 35 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 36 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
| 37 | spin_lock_init(&v4l2_dev->lock); |
| 38 | v4l2_dev->dev = dev; |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 39 | if (dev == NULL) { |
| 40 | /* If dev == NULL, then name must be filled in by the caller */ |
| 41 | WARN_ON(!v4l2_dev->name[0]); |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | /* Set name to driver name + device name if it is empty. */ |
| 46 | if (!v4l2_dev->name[0]) |
| 47 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", |
Kay Sievers | c3ef01c | 2009-03-24 16:38:22 -0700 | [diff] [blame] | 48 | dev->driver->name, dev_name(dev)); |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 49 | if (dev_get_drvdata(dev)) |
| 50 | v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n"); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 51 | dev_set_drvdata(dev, v4l2_dev); |
| 52 | return 0; |
| 53 | } |
| 54 | EXPORT_SYMBOL_GPL(v4l2_device_register); |
| 55 | |
Hans Verkuil | 102e781 | 2009-05-02 10:12:50 -0300 | [diff] [blame] | 56 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, |
| 57 | atomic_t *instance) |
| 58 | { |
| 59 | int num = atomic_inc_return(instance) - 1; |
| 60 | int len = strlen(basename); |
| 61 | |
| 62 | if (basename[len - 1] >= '0' && basename[len - 1] <= '9') |
| 63 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), |
| 64 | "%s-%d", basename, num); |
| 65 | else |
| 66 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), |
| 67 | "%s%d", basename, num); |
| 68 | return num; |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(v4l2_device_set_name); |
| 71 | |
Hans Verkuil | ae6cfaa | 2009-03-14 08:28:45 -0300 | [diff] [blame] | 72 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev) |
| 73 | { |
| 74 | if (v4l2_dev->dev) { |
| 75 | dev_set_drvdata(v4l2_dev->dev, NULL); |
| 76 | v4l2_dev->dev = NULL; |
| 77 | } |
| 78 | } |
| 79 | EXPORT_SYMBOL_GPL(v4l2_device_disconnect); |
| 80 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 81 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) |
| 82 | { |
| 83 | struct v4l2_subdev *sd, *next; |
| 84 | |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 85 | if (v4l2_dev == NULL) |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 86 | return; |
Hans Verkuil | ae6cfaa | 2009-03-14 08:28:45 -0300 | [diff] [blame] | 87 | v4l2_device_disconnect(v4l2_dev); |
| 88 | |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 89 | /* Unregister subdevs */ |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 90 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 91 | v4l2_device_unregister_subdev(sd); |
Randy Dunlap | ef5b516 | 2009-06-10 11:58:22 -0300 | [diff] [blame] | 92 | #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 93 | if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) { |
| 94 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
| 95 | |
| 96 | /* We need to unregister the i2c client explicitly. |
| 97 | We cannot rely on i2c_del_adapter to always |
| 98 | unregister clients for us, since if the i2c bus |
| 99 | is a platform bus, then it is never deleted. */ |
| 100 | if (client) |
| 101 | i2c_unregister_device(client); |
| 102 | } |
Randy Dunlap | b7fd606 | 2009-05-11 13:37:41 -0300 | [diff] [blame] | 103 | #endif |
Dmitri Belimov | 85e0921 | 2010-03-23 11:23:29 -0300 | [diff] [blame] | 104 | #if defined(CONFIG_SPI) |
| 105 | if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) { |
| 106 | struct spi_device *spi = v4l2_get_subdevdata(sd); |
| 107 | |
| 108 | if (spi) |
| 109 | spi_unregister_device(spi); |
| 110 | } |
| 111 | #endif |
Hans Verkuil | b5b2b7e | 2009-05-02 10:58:51 -0300 | [diff] [blame] | 112 | } |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 113 | } |
| 114 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); |
| 115 | |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 116 | int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
| 117 | struct v4l2_subdev *sd) |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 118 | { |
Hans Verkuil | 11bbc1c | 2010-05-16 09:24:06 -0300 | [diff] [blame^] | 119 | int err; |
| 120 | |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 121 | /* Check for valid input */ |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 122 | if (v4l2_dev == NULL || sd == NULL || !sd->name[0]) |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 123 | return -EINVAL; |
| 124 | /* Warn if we apparently re-register a subdev */ |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 125 | WARN_ON(sd->v4l2_dev != NULL); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 126 | if (!try_module_get(sd->owner)) |
| 127 | return -ENODEV; |
Hans Verkuil | 11bbc1c | 2010-05-16 09:24:06 -0300 | [diff] [blame^] | 128 | /* This just returns 0 if either of the two args is NULL */ |
| 129 | err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler); |
| 130 | if (err) |
| 131 | return err; |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 132 | sd->v4l2_dev = v4l2_dev; |
Hans Verkuil | 3a63e449 | 2009-02-14 11:54:23 -0300 | [diff] [blame] | 133 | spin_lock(&v4l2_dev->lock); |
| 134 | list_add_tail(&sd->list, &v4l2_dev->subdevs); |
| 135 | spin_unlock(&v4l2_dev->lock); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 136 | return 0; |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); |
| 139 | |
| 140 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) |
| 141 | { |
| 142 | /* return if it isn't registered */ |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 143 | if (sd == NULL || sd->v4l2_dev == NULL) |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 144 | return; |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 145 | spin_lock(&sd->v4l2_dev->lock); |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 146 | list_del(&sd->list); |
Hans Verkuil | b016760 | 2009-02-14 12:00:53 -0300 | [diff] [blame] | 147 | spin_unlock(&sd->v4l2_dev->lock); |
| 148 | sd->v4l2_dev = NULL; |
Hans Verkuil | 2a1fcdf | 2008-11-29 21:36:58 -0300 | [diff] [blame] | 149 | module_put(sd->owner); |
| 150 | } |
| 151 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |