Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
edbaa398 AF |
2 | /* |
3 | * uvc_debugfs.c -- USB Video Class driver - Debugging support | |
4 | * | |
5 | * Copyright (C) 2011 | |
6 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) | |
edbaa398 AF |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/usb.h> | |
13 | ||
14 | #include "uvcvideo.h" | |
15 | ||
7bc5edb0 AF |
16 | /* ----------------------------------------------------------------------------- |
17 | * Statistics | |
18 | */ | |
19 | ||
20 | #define UVC_DEBUGFS_BUF_SIZE 1024 | |
21 | ||
22 | struct uvc_debugfs_buffer { | |
23 | size_t count; | |
24 | char data[UVC_DEBUGFS_BUF_SIZE]; | |
25 | }; | |
26 | ||
27 | static int uvc_debugfs_stats_open(struct inode *inode, struct file *file) | |
28 | { | |
29 | struct uvc_streaming *stream = inode->i_private; | |
30 | struct uvc_debugfs_buffer *buf; | |
31 | ||
32 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
33 | if (buf == NULL) | |
34 | return -ENOMEM; | |
35 | ||
36 | buf->count = uvc_video_stats_dump(stream, buf->data, sizeof(buf->data)); | |
37 | ||
38 | file->private_data = buf; | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static ssize_t uvc_debugfs_stats_read(struct file *file, char __user *user_buf, | |
43 | size_t nbytes, loff_t *ppos) | |
44 | { | |
45 | struct uvc_debugfs_buffer *buf = file->private_data; | |
46 | ||
47 | return simple_read_from_buffer(user_buf, nbytes, ppos, buf->data, | |
48 | buf->count); | |
49 | } | |
50 | ||
51 | static int uvc_debugfs_stats_release(struct inode *inode, struct file *file) | |
52 | { | |
53 | kfree(file->private_data); | |
54 | file->private_data = NULL; | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | static const struct file_operations uvc_debugfs_stats_fops = { | |
60 | .owner = THIS_MODULE, | |
61 | .open = uvc_debugfs_stats_open, | |
62 | .llseek = no_llseek, | |
63 | .read = uvc_debugfs_stats_read, | |
64 | .release = uvc_debugfs_stats_release, | |
65 | }; | |
66 | ||
edbaa398 AF |
67 | /* ----------------------------------------------------------------------------- |
68 | * Global and stream initialization/cleanup | |
69 | */ | |
70 | ||
71 | static struct dentry *uvc_debugfs_root_dir; | |
72 | ||
39dc3aae | 73 | void uvc_debugfs_init_stream(struct uvc_streaming *stream) |
edbaa398 AF |
74 | { |
75 | struct usb_device *udev = stream->dev->udev; | |
675e2f20 | 76 | char dir_name[33]; |
edbaa398 AF |
77 | |
78 | if (uvc_debugfs_root_dir == NULL) | |
39dc3aae | 79 | return; |
edbaa398 | 80 | |
675e2f20 TS |
81 | snprintf(dir_name, sizeof(dir_name), "%u-%u-%u", udev->bus->busnum, |
82 | udev->devnum, stream->intfnum); | |
edbaa398 | 83 | |
057e212e GKH |
84 | stream->debugfs_dir = debugfs_create_dir(dir_name, |
85 | uvc_debugfs_root_dir); | |
edbaa398 | 86 | |
057e212e GKH |
87 | debugfs_create_file("stats", 0444, stream->debugfs_dir, stream, |
88 | &uvc_debugfs_stats_fops); | |
edbaa398 AF |
89 | } |
90 | ||
91 | void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream) | |
92 | { | |
edbaa398 AF |
93 | debugfs_remove_recursive(stream->debugfs_dir); |
94 | stream->debugfs_dir = NULL; | |
95 | } | |
96 | ||
39dc3aae | 97 | void uvc_debugfs_init(void) |
edbaa398 | 98 | { |
54ef0b39 | 99 | uvc_debugfs_root_dir = debugfs_create_dir("uvcvideo", usb_debug_root); |
edbaa398 AF |
100 | } |
101 | ||
102 | void uvc_debugfs_cleanup(void) | |
103 | { | |
829682b3 | 104 | debugfs_remove_recursive(uvc_debugfs_root_dir); |
edbaa398 | 105 | } |