drivers/infiniband/hw/usnic/usnic_debugfs.c

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  *
  17  */
  18
  19 #include <linux/debugfs.h>
  20 #include <linux/module.h>
  21
  22 #include "usnic.h"
  23 #include "usnic_log.h"
  24 #include "usnic_debugfs.h"
  25
  26 static struct dentry *debugfs_root;
  27
  28 static ssize_t usnic_debugfs_buildinfo_read(struct file *f, char __user *data,
  29                                                 size_t count, loff_t *ppos)
  30 {
  31         char buf[500];
  32         int res;
  33
  34         if (*ppos > 0)
  35                 return 0;
  36
  37         res = scnprintf(buf, sizeof(buf),
  38                         "version:       %s\n"
  39                         "build date:    %s\n",
  40                         DRV_VERSION, DRV_RELDATE);
  41
  42         return simple_read_from_buffer(data, count, ppos, buf, res);
  43 }
  44
  45 static const struct file_operations usnic_debugfs_buildinfo_ops = {
  46         .owner = THIS_MODULE,
  47         .open = simple_open,
  48         .read = usnic_debugfs_buildinfo_read
  49 };
  50
  51 void usnic_debugfs_init(void)
  52 {
  53         debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
  54         if (IS_ERR(debugfs_root)) {
  55                 usnic_err("Failed to create debugfs root dir, check if debugfs is enabled in kernel configuration\n");
  56                 debugfs_root = NULL;
  57                 return;
  58         }
  59
  60         debugfs_create_file("build-info", S_IRUGO, debugfs_root,
  61                                 NULL, &usnic_debugfs_buildinfo_ops);
  62 }
  63
  64 void usnic_debugfs_exit(void)
  65 {
  66         if (!debugfs_root)
  67                 return;
  68
  69         debugfs_remove_recursive(debugfs_root);
  70         debugfs_root = NULL;
  71 }