7bc5edb00b
Export the statistics through debugfs. Signed-off-by: Alexey Fisher <bug-track@fisher-privat.net> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
|
|
* uvc_debugfs.c -- USB Video Class driver - Debugging support
|
|
*
|
|
* Copyright (C) 2011
|
|
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
|
|
*
|
|
* 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;
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
int uvc_debugfs_init(void)
|
|
{
|
|
struct dentry *dir;
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|