323 lines
8.3 KiB
C
323 lines
8.3 KiB
C
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/*
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V4L2 device support.
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#if defined(CONFIG_SPI)
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#include <linux/spi/spi.h>
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#endif
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
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{
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if (v4l2_dev == NULL)
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return -EINVAL;
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INIT_LIST_HEAD(&v4l2_dev->subdevs);
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spin_lock_init(&v4l2_dev->lock);
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v4l2_prio_init(&v4l2_dev->prio);
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kref_init(&v4l2_dev->ref);
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get_device(dev);
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v4l2_dev->dev = dev;
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if (dev == NULL) {
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/* If dev == NULL, then name must be filled in by the caller */
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if (WARN_ON(!v4l2_dev->name[0]))
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return -EINVAL;
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return 0;
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}
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/* Set name to driver name + device name if it is empty. */
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if (!v4l2_dev->name[0])
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snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
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dev->driver->name, dev_name(dev));
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if (!dev_get_drvdata(dev))
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dev_set_drvdata(dev, v4l2_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_device_register);
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static void v4l2_device_release(struct kref *ref)
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{
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struct v4l2_device *v4l2_dev =
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container_of(ref, struct v4l2_device, ref);
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if (v4l2_dev->release)
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v4l2_dev->release(v4l2_dev);
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}
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int v4l2_device_put(struct v4l2_device *v4l2_dev)
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{
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return kref_put(&v4l2_dev->ref, v4l2_device_release);
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}
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EXPORT_SYMBOL_GPL(v4l2_device_put);
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int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
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atomic_t *instance)
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{
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int num = atomic_inc_return(instance) - 1;
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int len = strlen(basename);
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if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
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snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
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"%s-%d", basename, num);
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else
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snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
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"%s%d", basename, num);
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return num;
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}
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EXPORT_SYMBOL_GPL(v4l2_device_set_name);
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void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
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{
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if (v4l2_dev->dev == NULL)
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return;
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if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
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dev_set_drvdata(v4l2_dev->dev, NULL);
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put_device(v4l2_dev->dev);
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v4l2_dev->dev = NULL;
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}
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EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
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void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
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{
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struct v4l2_subdev *sd, *next;
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/* Just return if v4l2_dev is NULL or if it was already
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* unregistered before. */
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if (v4l2_dev == NULL || !v4l2_dev->name[0])
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return;
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v4l2_device_disconnect(v4l2_dev);
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/* Unregister subdevs */
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list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) {
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v4l2_device_unregister_subdev(sd);
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#if IS_ENABLED(CONFIG_I2C)
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if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) {
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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/*
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* We need to unregister the i2c client
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* explicitly. We cannot rely on
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* i2c_del_adapter to always unregister
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* clients for us, since if the i2c bus is a
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* platform bus, then it is never deleted.
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*
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* Device tree or ACPI based devices must not
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* be unregistered as they have not been
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* registered by us, and would not be
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* re-created by just probing the V4L2 driver.
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*/
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if (client &&
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!client->dev.of_node && !client->dev.fwnode)
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i2c_unregister_device(client);
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continue;
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}
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#endif
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#if defined(CONFIG_SPI)
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if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
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struct spi_device *spi = v4l2_get_subdevdata(sd);
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if (spi && !spi->dev.of_node && !spi->dev.fwnode)
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spi_unregister_device(spi);
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continue;
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}
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#endif
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}
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/* Mark as unregistered, thus preventing duplicate unregistrations */
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v4l2_dev->name[0] = '\0';
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}
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EXPORT_SYMBOL_GPL(v4l2_device_unregister);
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int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
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struct v4l2_subdev *sd)
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{
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#if defined(CONFIG_MEDIA_CONTROLLER)
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struct media_entity *entity = &sd->entity;
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#endif
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int err;
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/* Check for valid input */
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if (!v4l2_dev || !sd || sd->v4l2_dev || !sd->name[0])
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return -EINVAL;
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/*
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* The reason to acquire the module here is to avoid unloading
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* a module of sub-device which is registered to a media
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* device. To make it possible to unload modules for media
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* devices that also register sub-devices, do not
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* try_module_get() such sub-device owners.
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*/
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sd->owner_v4l2_dev = v4l2_dev->dev && v4l2_dev->dev->driver &&
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sd->owner == v4l2_dev->dev->driver->owner;
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if (!sd->owner_v4l2_dev && !try_module_get(sd->owner))
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return -ENODEV;
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sd->v4l2_dev = v4l2_dev;
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/* This just returns 0 if either of the two args is NULL */
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err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL);
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if (err)
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goto error_module;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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/* Register the entity. */
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if (v4l2_dev->mdev) {
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err = media_device_register_entity(v4l2_dev->mdev, entity);
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if (err < 0)
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goto error_module;
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}
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#endif
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if (sd->internal_ops && sd->internal_ops->registered) {
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err = sd->internal_ops->registered(sd);
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if (err)
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goto error_unregister;
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}
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spin_lock(&v4l2_dev->lock);
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list_add_tail(&sd->list, &v4l2_dev->subdevs);
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spin_unlock(&v4l2_dev->lock);
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return 0;
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error_unregister:
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#if defined(CONFIG_MEDIA_CONTROLLER)
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media_device_unregister_entity(entity);
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#endif
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error_module:
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if (!sd->owner_v4l2_dev)
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module_put(sd->owner);
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sd->v4l2_dev = NULL;
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return err;
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}
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EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
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static void v4l2_device_release_subdev_node(struct video_device *vdev)
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{
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struct v4l2_subdev *sd = video_get_drvdata(vdev);
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sd->devnode = NULL;
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kfree(vdev);
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}
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int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
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{
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struct video_device *vdev;
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struct v4l2_subdev *sd;
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int err;
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/* Register a device node for every subdev marked with the
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* V4L2_SUBDEV_FL_HAS_DEVNODE flag.
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*/
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list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
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if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
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continue;
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if (sd->devnode)
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continue;
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vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
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if (!vdev) {
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err = -ENOMEM;
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goto clean_up;
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}
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video_set_drvdata(vdev, sd);
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strlcpy(vdev->name, sd->name, sizeof(vdev->name));
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vdev->v4l2_dev = v4l2_dev;
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vdev->fops = &v4l2_subdev_fops;
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vdev->release = v4l2_device_release_subdev_node;
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vdev->ctrl_handler = sd->ctrl_handler;
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err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
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sd->owner);
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if (err < 0) {
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kfree(vdev);
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goto clean_up;
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}
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sd->devnode = vdev;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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sd->entity.info.dev.major = VIDEO_MAJOR;
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sd->entity.info.dev.minor = vdev->minor;
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/* Interface is created by __video_register_device() */
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if (vdev->v4l2_dev->mdev) {
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struct media_link *link;
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link = media_create_intf_link(&sd->entity,
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&vdev->intf_devnode->intf,
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MEDIA_LNK_FL_ENABLED);
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if (!link) {
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err = -ENOMEM;
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goto clean_up;
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}
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}
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#endif
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}
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return 0;
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clean_up:
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list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
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if (!sd->devnode)
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break;
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video_unregister_device(sd->devnode);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
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void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
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{
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struct v4l2_device *v4l2_dev;
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/* return if it isn't registered */
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if (sd == NULL || sd->v4l2_dev == NULL)
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return;
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v4l2_dev = sd->v4l2_dev;
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spin_lock(&v4l2_dev->lock);
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list_del(&sd->list);
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spin_unlock(&v4l2_dev->lock);
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if (sd->internal_ops && sd->internal_ops->unregistered)
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sd->internal_ops->unregistered(sd);
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sd->v4l2_dev = NULL;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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if (v4l2_dev->mdev) {
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/*
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* No need to explicitly remove links, as both pads and
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* links are removed by the function below, in the right order
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*/
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media_device_unregister_entity(&sd->entity);
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}
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#endif
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video_unregister_device(sd->devnode);
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if (!sd->owner_v4l2_dev)
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module_put(sd->owner);
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}
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EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
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