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,
  39                                      size_t count, loff_t *ppos)
  40 {
  41         char buf[128];
  42         int res = 0;
  43
  44         /* only allow read from start */
  45         if (*ppos > 0)
  46                 return 0;
  47
  48         res = scnprintf(buf, sizeof(buf), "Debug Level: %x\n",
  49                         atomic_read(&WILC_DEBUG_LEVEL));
  50
  51         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  52 }
  53
  54 static ssize_t wilc_debug_level_write(struct file *filp,
  55                                       const char __user *buf, size_t count,
  56                                       loff_t *ppos)
  57 {
  58         int flag = 0;
  59         int ret;
  60
  61         ret = kstrtouint_from_user(buf, count, 16, &flag);
  62         if (ret)
  63                 return ret;
  64
  65         if (flag > DBG_LEVEL_ALL) {
  66                 pr_info("%s, value (0x%08x) is out of range, stay previous flag (0x%08x)\n",
  67                         __func__, flag, atomic_read(&WILC_DEBUG_LEVEL));
  68                 return -EINVAL;
  69         }
  70
  71         atomic_set(&WILC_DEBUG_LEVEL, (int)flag);
  72
  73         if (flag == 0)
  74                 pr_info("Debug-level disabled\n");
  75         else
  76                 pr_info("Debug-level enabled\n");
  77
  78         return count;
  79 }
  80
  81 /*
  82  * ----------------------------------------------------------------------------
  83  */
  84
  85 #define FOPS(_open, _read, _write, _poll) { \
  86                 .owner  = THIS_MODULE, \
  87                 .open   = (_open), \
  88                 .read   = (_read), \
  89                 .write  = (_write), \
  90                 .poll           = (_poll), \
  91 }
  92
  93 struct wilc_debugfs_info_t {
  94         const char *name;
  95         int perm;
  96         unsigned int data;
  97         const struct file_operations fops;
  98 };
  99
 100 static struct wilc_debugfs_info_t debugfs_info[] = {
 101         {
 102                 "wilc_debug_level",
 103                 0666,
 104                 (DEBUG | ERR),
 105                 FOPS(NULL, wilc_debug_level_read, wilc_debug_level_write, NULL),
 106         },
 107 };
 108
 109 static int __init wilc_debugfs_init(void)
 110 {
 111         int i;
 112         struct wilc_debugfs_info_t *info;
 113
 114         wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
 115         for (i = 0; i < ARRAY_SIZE(debugfs_info); i++) {
 116                 info = &debugfs_info[i];
 117                 debugfs_create_file(info->name,
 118                                     info->perm,
 119                                     wilc_dir,
 120                                     &info->data,
 121                                     &info->fops);
 122         }
 123         return 0;
 124 }
 125 module_init(wilc_debugfs_init);
 126
 127 static void __exit wilc_debugfs_remove(void)
 128 {
 129         debugfs_remove_recursive(wilc_dir);
 130 }
 131 module_exit(wilc_debugfs_remove);
 132
 133 #endif