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uvcvideo: backported from kernel 3.4.x
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Siarhei Volkau
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Aug 31, 2015
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| /* | ||
| * uvc_debugfs.c -- USB Video Class driver - Debugging support | ||
| * | ||
| * Copyright (C) 2011 | ||
| * Laurent Pinchart ([email protected]) | ||
| * | ||
| * 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 <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; | ||
|
|
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| buf->count = uvc_video_stats_dump(stream, buf->data, sizeof(buf->data)); | ||
|
|
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| file->private_data = buf; | ||
| return 0; | ||
| } | ||
|
|
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| 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 | ||
| */ | ||
|
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| static struct dentry *uvc_debugfs_root_dir; | ||
|
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||
| 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; | ||
|
|
||
| dent = debugfs_create_file("stats", 0444, stream->debugfs_dir, | ||
| stream, &uvc_debugfs_stats_fops); | ||
| if (IS_ERR_OR_NULL(dent)) { | ||
| uvc_printk(KERN_INFO, "Unable to create debugfs stats file.\n"); | ||
| uvc_debugfs_cleanup_stream(stream); | ||
| return -ENODEV; | ||
| } | ||
|
|
||
| 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; | ||
| } | ||
|
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| int uvc_debugfs_init(void) | ||
| { | ||
| struct dentry *dir; | ||
|
|
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| 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; | ||
| } | ||
|
|
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| 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); | ||
| } |
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