drivers/staging/wilc1000/wilc_debugfs.c

   1 /*
   2  * NewportMedia WiFi chipset driver test tools - wilc-debug
   3  * Copyright (c) 2012 NewportMedia Inc.
   4  * Author: SSW <sswd@wilcsemic.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #if defined(WILC_DEBUGFS)
  13 #include <linux/module.h>
  14 #include <linux/debugfs.h>
  15 #include <linux/poll.h>
  16 #include <linux/sched.h>
  17
  18 #include "wilc_wlan_if.h"
  19
  20 static struct dentry *wilc_dir;
  21
  22 /*
  23  * --------------------------------------------------------------------------------
  24  */
  25 #define DEBUG           BIT(0)
  26 #define INFO            BIT(1)
  27 #define WRN             BIT(2)
  28 #define ERR             BIT(3)
  29
  30 #define DBG_LEVEL_ALL   (DEBUG | INFO | WRN | ERR)
  31 static atomic_t WILC_DEBUG_LEVEL = ATOMIC_INIT(ERR);
  32 EXPORT_SYMBOL_GPL(WILC_DEBUG_LEVEL);
  33
  34 /*
  35  * --------------------------------------------------------------------------------
  36  */
  37
  38 static ssize_t wilc_debug_level_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos)
  39 {
  40         char buf[128];
  41         int res = 0;
  42
  43         /* only allow read from start */
  44         if (*ppos > 0)
  45                 return 0;
  46
  47         res = scnprintf(buf, sizeof(buf), "Debug Level: %x\n", atomic_read(&WILC_DEBUG_LEVEL));
  48
  49         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  50 }
  51
  52 static ssize_t wilc_debug_level_write(struct file *filp, const char __user *buf,
  53                                       size_t count, loff_t *ppos)
  54 {
  55         int flag = 0;
  56         int ret;
  57
  58         ret = kstrtouint_from_user(buf, count, 16, &flag);
  59         if (ret)
  60                 return ret;
  61
  62         if (flag > DBG_LEVEL_ALL) {
  63                 pr_info("%s, value (0x%08x) is out of range, stay previous flag (0x%08x)\n", __func__, flag, atomic_read(&WILC_DEBUG_LEVEL));
  64                 return -EINVAL;
  65         }
  66
  67         atomic_set(&WILC_DEBUG_LEVEL, (int)flag);
  68
  69         if (flag == 0)
  70                 pr_info("Debug-level disabled\n");
  71         else
  72                 pr_info("Debug-level enabled\n");
  73
  74         return count;
  75 }
  76
  77 /*
  78  * --------------------------------------------------------------------------------
  79  */
  80
  81 #define FOPS(_open, _read, _write, _poll) { \
  82                 .owner  = THIS_MODULE, \
  83                 .open   = (_open), \
  84                 .read   = (_read), \
  85                 .write  = (_write), \
  86                 .poll           = (_poll), \
  87 }
  88
  89 struct wilc_debugfs_info_t {
  90         const char *name;
  91         int perm;
  92         unsigned int data;
  93         const struct file_operations fops;
  94 };
  95
  96 static struct wilc_debugfs_info_t debugfs_info[] = {
  97         { "wilc_debug_level",   0666,   (DEBUG | ERR), FOPS(NULL, wilc_debug_level_read, wilc_debug_level_write, NULL), },
  98 };
  99
 100 static int __init wilc_debugfs_init(void)
 101 {
 102         int i;
 103         struct wilc_debugfs_info_t *info;
 104
 105         wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
 106         for (i = 0; i < ARRAY_SIZE(debugfs_info); i++) {
 107                 info = &debugfs_info[i];
 108                 debugfs_create_file(info->name,
 109                                     info->perm,
 110                                     wilc_dir,
 111                                     &info->data,
 112                                     &info->fops);
 113         }
 114         return 0;
 115 }
 116 module_init(wilc_debugfs_init);
 117
 118 static void __exit wilc_debugfs_remove(void)
 119 {
 120         debugfs_remove_recursive(wilc_dir);
 121 }
 122 module_exit(wilc_debugfs_remove);
 123
 124 #endif
 125