From edbaa39842793fc4ac6603b277f2ad76f2057a45 Mon Sep 17 00:00:00 2001 From: Alexey Fisher Date: Thu, 3 Nov 2011 09:39:37 -0300 Subject: [media] uvcvideo: Add debugfs support Create a debugfs entry per UVC stream. This will be used to export stream statistics. Signed-off-by: Alexey Fisher Signed-off-by: Laurent Pinchart [mchehab@redhat.com: add incude to avoid compilation breakage] Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/uvc/uvc_debugfs.c | 77 +++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 drivers/media/video/uvc/uvc_debugfs.c (limited to 'drivers/media/video/uvc/uvc_debugfs.c') diff --git a/drivers/media/video/uvc/uvc_debugfs.c b/drivers/media/video/uvc/uvc_debugfs.c new file mode 100644 index 000000000000..39fd43b3e1d2 --- /dev/null +++ b/drivers/media/video/uvc/uvc_debugfs.c @@ -0,0 +1,77 @@ +/* + * uvc_debugfs.c -- USB Video Class driver - Debugging support + * + * Copyright (C) 2011 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include +#include +#include +#include + +#include "uvcvideo.h" + +/* ----------------------------------------------------------------------------- + * Global and stream initialization/cleanup + */ + +static struct dentry *uvc_debugfs_root_dir; + +int uvc_debugfs_init_stream(struct uvc_streaming *stream) +{ + struct usb_device *udev = stream->dev->udev; + struct dentry *dent; + char dir_name[32]; + + if (uvc_debugfs_root_dir == NULL) + return -ENODEV; + + sprintf(dir_name, "%u-%u", udev->bus->busnum, udev->devnum); + + dent = debugfs_create_dir(dir_name, uvc_debugfs_root_dir); + if (IS_ERR_OR_NULL(dent)) { + uvc_printk(KERN_INFO, "Unable to create debugfs %s directory.\n", + dir_name); + return -ENODEV; + } + + stream->debugfs_dir = dent; + + return 0; +} + +void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream) +{ + if (stream->debugfs_dir == NULL) + return; + + debugfs_remove_recursive(stream->debugfs_dir); + stream->debugfs_dir = NULL; +} + +int uvc_debugfs_init(void) +{ + struct dentry *dir; + + dir = debugfs_create_dir("uvcvideo", usb_debug_root); + if (IS_ERR_OR_NULL(dir)) { + uvc_printk(KERN_INFO, "Unable to create debugfs directory\n"); + return -ENODATA; + } + + uvc_debugfs_root_dir = dir; + return 0; +} + +void uvc_debugfs_cleanup(void) +{ + if (uvc_debugfs_root_dir != NULL) + debugfs_remove_recursive(uvc_debugfs_root_dir); +} -- cgit v1.2.3