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edbaa398 AF |
1 | /* |
2 | * uvc_debugfs.c -- USB Video Class driver - Debugging support | |
3 | * | |
4 | * Copyright (C) 2011 | |
5 | * Laurent Pinchart (laurent.pinchart@ideasonboard.com) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/debugfs.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/usb.h> | |
18 | ||
19 | #include "uvcvideo.h" | |
20 | ||
7bc5edb0 AF |
21 | /* ----------------------------------------------------------------------------- |
22 | * Statistics | |
23 | */ | |
24 | ||
25 | #define UVC_DEBUGFS_BUF_SIZE 1024 | |
26 | ||
27 | struct uvc_debugfs_buffer { | |
28 | size_t count; | |
29 | char data[UVC_DEBUGFS_BUF_SIZE]; | |
30 | }; | |
31 | ||
32 | static int uvc_debugfs_stats_open(struct inode *inode, struct file *file) | |
33 | { | |
34 | struct uvc_streaming *stream = inode->i_private; | |
35 | struct uvc_debugfs_buffer *buf; | |
36 | ||
37 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
38 | if (buf == NULL) | |
39 | return -ENOMEM; | |
40 | ||
41 | buf->count = uvc_video_stats_dump(stream, buf->data, sizeof(buf->data)); | |
42 | ||
43 | file->private_data = buf; | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static ssize_t uvc_debugfs_stats_read(struct file *file, char __user *user_buf, | |
48 | size_t nbytes, loff_t *ppos) | |
49 | { | |
50 | struct uvc_debugfs_buffer *buf = file->private_data; | |
51 | ||
52 | return simple_read_from_buffer(user_buf, nbytes, ppos, buf->data, | |
53 | buf->count); | |
54 | } | |
55 | ||
56 | static int uvc_debugfs_stats_release(struct inode *inode, struct file *file) | |
57 | { | |
58 | kfree(file->private_data); | |
59 | file->private_data = NULL; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static const struct file_operations uvc_debugfs_stats_fops = { | |
65 | .owner = THIS_MODULE, | |
66 | .open = uvc_debugfs_stats_open, | |
67 | .llseek = no_llseek, | |
68 | .read = uvc_debugfs_stats_read, | |
69 | .release = uvc_debugfs_stats_release, | |
70 | }; | |
71 | ||
edbaa398 AF |
72 | /* ----------------------------------------------------------------------------- |
73 | * Global and stream initialization/cleanup | |
74 | */ | |
75 | ||
76 | static struct dentry *uvc_debugfs_root_dir; | |
77 | ||
78 | int uvc_debugfs_init_stream(struct uvc_streaming *stream) | |
79 | { | |
80 | struct usb_device *udev = stream->dev->udev; | |
81 | struct dentry *dent; | |
82 | char dir_name[32]; | |
83 | ||
84 | if (uvc_debugfs_root_dir == NULL) | |
85 | return -ENODEV; | |
86 | ||
87 | sprintf(dir_name, "%u-%u", udev->bus->busnum, udev->devnum); | |
88 | ||
89 | dent = debugfs_create_dir(dir_name, uvc_debugfs_root_dir); | |
90 | if (IS_ERR_OR_NULL(dent)) { | |
7bc5edb0 AF |
91 | uvc_printk(KERN_INFO, "Unable to create debugfs %s " |
92 | "directory.\n", dir_name); | |
edbaa398 AF |
93 | return -ENODEV; |
94 | } | |
95 | ||
96 | stream->debugfs_dir = dent; | |
97 | ||
7bc5edb0 AF |
98 | dent = debugfs_create_file("stats", 0444, stream->debugfs_dir, |
99 | stream, &uvc_debugfs_stats_fops); | |
100 | if (IS_ERR_OR_NULL(dent)) { | |
101 | uvc_printk(KERN_INFO, "Unable to create debugfs stats file.\n"); | |
102 | uvc_debugfs_cleanup_stream(stream); | |
103 | return -ENODEV; | |
104 | } | |
105 | ||
edbaa398 AF |
106 | return 0; |
107 | } | |
108 | ||
109 | void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream) | |
110 | { | |
111 | if (stream->debugfs_dir == NULL) | |
112 | return; | |
113 | ||
114 | debugfs_remove_recursive(stream->debugfs_dir); | |
115 | stream->debugfs_dir = NULL; | |
116 | } | |
117 | ||
118 | int uvc_debugfs_init(void) | |
119 | { | |
120 | struct dentry *dir; | |
121 | ||
122 | dir = debugfs_create_dir("uvcvideo", usb_debug_root); | |
123 | if (IS_ERR_OR_NULL(dir)) { | |
124 | uvc_printk(KERN_INFO, "Unable to create debugfs directory\n"); | |
125 | return -ENODATA; | |
126 | } | |
127 | ||
128 | uvc_debugfs_root_dir = dir; | |
129 | return 0; | |
130 | } | |
131 | ||
132 | void uvc_debugfs_cleanup(void) | |
133 | { | |
134 | if (uvc_debugfs_root_dir != NULL) | |
135 | debugfs_remove_recursive(uvc_debugfs_root_dir); | |
136 | } |