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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/media/usb/uvc/uvc_debugfs.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/media/usb/uvc/uvc_debugfs.c')
-rw-r--r-- | drivers/media/usb/uvc/uvc_debugfs.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_debugfs.c b/drivers/media/usb/uvc/uvc_debugfs.c new file mode 100644 index 0000000000..1a1258d4ff --- /dev/null +++ b/drivers/media/usb/uvc/uvc_debugfs.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * uvc_debugfs.c -- USB Video Class driver - Debugging support + * + * Copyright (C) 2011 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + */ + +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <linux/usb.h> + +#include "uvcvideo.h" + +/* ----------------------------------------------------------------------------- + * Statistics + */ + +#define UVC_DEBUGFS_BUF_SIZE 1024 + +struct uvc_debugfs_buffer { + size_t count; + char data[UVC_DEBUGFS_BUF_SIZE]; +}; + +static int uvc_debugfs_stats_open(struct inode *inode, struct file *file) +{ + struct uvc_streaming *stream = inode->i_private; + struct uvc_debugfs_buffer *buf; + + buf = kmalloc(sizeof(*buf), GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + buf->count = uvc_video_stats_dump(stream, buf->data, sizeof(buf->data)); + + file->private_data = buf; + return 0; +} + +static ssize_t uvc_debugfs_stats_read(struct file *file, char __user *user_buf, + size_t nbytes, loff_t *ppos) +{ + struct uvc_debugfs_buffer *buf = file->private_data; + + return simple_read_from_buffer(user_buf, nbytes, ppos, buf->data, + buf->count); +} + +static int uvc_debugfs_stats_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + file->private_data = NULL; + + return 0; +} + +static const struct file_operations uvc_debugfs_stats_fops = { + .owner = THIS_MODULE, + .open = uvc_debugfs_stats_open, + .llseek = no_llseek, + .read = uvc_debugfs_stats_read, + .release = uvc_debugfs_stats_release, +}; + +/* ----------------------------------------------------------------------------- + * Global and stream initialization/cleanup + */ + +static struct dentry *uvc_debugfs_root_dir; + +void uvc_debugfs_init_stream(struct uvc_streaming *stream) +{ + struct usb_device *udev = stream->dev->udev; + char dir_name[33]; + + if (uvc_debugfs_root_dir == NULL) + return; + + snprintf(dir_name, sizeof(dir_name), "%u-%u-%u", udev->bus->busnum, + udev->devnum, stream->intfnum); + + stream->debugfs_dir = debugfs_create_dir(dir_name, + uvc_debugfs_root_dir); + + debugfs_create_file("stats", 0444, stream->debugfs_dir, stream, + &uvc_debugfs_stats_fops); +} + +void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream) +{ + debugfs_remove_recursive(stream->debugfs_dir); + stream->debugfs_dir = NULL; +} + +void uvc_debugfs_init(void) +{ + uvc_debugfs_root_dir = debugfs_create_dir("uvcvideo", usb_debug_root); +} + +void uvc_debugfs_cleanup(void) +{ + debugfs_remove_recursive(uvc_debugfs_root_dir); +} |