forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
2.5 KiB
105 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* uvc_debugfs.c -- USB Video Class driver - Debugging support |
|
* |
|
* Copyright (C) 2011 |
|
* Laurent Pinchart ([email protected]) |
|
*/ |
|
|
|
#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); |
|
}
|
|
|