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@@ -0,0 +1,100 @@
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+/*
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+ * Media device
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+ *
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+ * Copyright (C) 2010 Nokia Corporation
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+ *
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+ * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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+ * Sakari Ailus <sakari.ailus@iki.fi>
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+ *
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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 version 2 as
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+ * published by the Free Software Foundation.
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+ *
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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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+ *
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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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+
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+#include <linux/types.h>
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+#include <linux/ioctl.h>
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+
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+#include <media/media-device.h>
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+#include <media/media-devnode.h>
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+
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+static const struct media_file_operations media_device_fops = {
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+ .owner = THIS_MODULE,
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+};
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+
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+/* -----------------------------------------------------------------------------
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+ * sysfs
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+ */
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+
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+static ssize_t show_model(struct device *cd,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct media_device *mdev = to_media_device(to_media_devnode(cd));
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+
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+ return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
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+}
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+
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+static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
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+
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+/* -----------------------------------------------------------------------------
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+ * Registration/unregistration
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+ */
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+
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+static void media_device_release(struct media_devnode *mdev)
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+{
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+}
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+
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+/**
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+ * media_device_register - register a media device
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+ * @mdev: The media device
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+ *
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+ * The caller is responsible for initializing the media device before
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+ * registration. The following fields must be set:
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+ *
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+ * - dev must point to the parent device
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+ * - model must be filled with the device model name
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+ */
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+int __must_check media_device_register(struct media_device *mdev)
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+{
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+ int ret;
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+
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+ if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
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+ return -EINVAL;
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+
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+ /* Register the device node. */
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+ mdev->devnode.fops = &media_device_fops;
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+ mdev->devnode.parent = mdev->dev;
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+ mdev->devnode.release = media_device_release;
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+ ret = media_devnode_register(&mdev->devnode);
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
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+ if (ret < 0) {
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+ media_devnode_unregister(&mdev->devnode);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(media_device_register);
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+
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+/**
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+ * media_device_unregister - unregister a media device
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+ * @mdev: The media device
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+ *
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+ */
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+void media_device_unregister(struct media_device *mdev)
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+{
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+ device_remove_file(&mdev->devnode.dev, &dev_attr_model);
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+ media_devnode_unregister(&mdev->devnode);
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+}
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+EXPORT_SYMBOL_GPL(media_device_unregister);
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Laurent Pinchart