drivers/staging/wilc1000/wilc_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NewportMedia WiFi chipset driver test tools - wilc-debug
   4  * Copyright (c) 2012 NewportMedia Inc.
   5  * Author: SSW <sswd@wilcsemic.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #if defined(WILC_DEBUGFS)
  14 #include <linux/module.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/poll.h>
  17 #include <linux/sched.h>
  18
  19 #include "wilc_wlan_if.h"
  20
  21 static struct dentry *wilc_dir;
  22
  23 /*
  24  * ----------------------------------------------------------------------------
  25  */
  26 #define DEBUG           BIT(0)
  27 #define INFO            BIT(1)
  28 #define WRN             BIT(2)
  29 #define ERR             BIT(3)
  30
  31 #define DBG_LEVEL_ALL   (DEBUG | INFO | WRN | ERR)
  32 static atomic_t WILC_DEBUG_LEVEL = ATOMIC_INIT(ERR);
  33 EXPORT_SYMBOL_GPL(WILC_DEBUG_LEVEL);
  34
  35 /*
  36  * ----------------------------------------------------------------------------
  37  */
  38
  39 static ssize_t wilc_debug_level_read(struct file *file, char __user *userbuf,
  40                                      size_t count, loff_t *ppos)
  41 {
  42         char buf[128];
  43         int res = 0;
  44
  45         /* only allow read from start */
  46         if (*ppos > 0)
  47                 return 0;
  48
  49         res = scnprintf(buf, sizeof(buf), "Debug Level: %x\n",
  50                         atomic_read(&WILC_DEBUG_LEVEL));
  51
  52         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  53 }
  54
  55 static ssize_t wilc_debug_level_write(struct file *filp,
  56                                       const char __user *buf, size_t count,
  57                                       loff_t *ppos)
  58 {
  59         int flag = 0;
  60         int ret;
  61
  62         ret = kstrtouint_from_user(buf, count, 16, &flag);
  63         if (ret)
  64                 return ret;
  65
  66         if (flag > DBG_LEVEL_ALL) {
  67                 pr_info("%s, value (0x%08x) is out of range, stay previous flag (0x%08x)\n",
  68                         __func__, flag, atomic_read(&WILC_DEBUG_LEVEL));
  69                 return -EINVAL;
  70         }
  71
  72         atomic_set(&WILC_DEBUG_LEVEL, (int)flag);
  73
  74         if (flag == 0)
  75                 pr_info("Debug-level disabled\n");
  76         else
  77                 pr_info("Debug-level enabled\n");
  78
  79         return count;
  80 }
  81
  82 /*
  83  * ----------------------------------------------------------------------------
  84  */
  85
  86 #define FOPS(_open, _read, _write, _poll) { \
  87                 .owner  = THIS_MODULE, \
  88                 .open   = (_open), \
  89                 .read   = (_read), \
  90                 .write  = (_write), \
  91                 .poll           = (_poll), \
  92 }
  93
  94 struct wilc_debugfs_info_t {
  95         const char *name;
  96         int perm;
  97         unsigned int data;
  98         const struct file_operations fops;
  99 };
 100
 101 static struct wilc_debugfs_info_t debugfs_info[] = {
 102         {
 103                 "wilc_debug_level",
 104                 0666,
 105                 (DEBUG | ERR),
 106                 FOPS(NULL, wilc_debug_level_read, wilc_debug_level_write, NULL),
 107         },
 108 };
 109
 110 static int __init wilc_debugfs_init(void)
 111 {
 112         int i;
 113         struct wilc_debugfs_info_t *info;
 114
 115         wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
 116         for (i = 0; i < ARRAY_SIZE(debugfs_info); i++) {
 117                 info = &debugfs_info[i];
 118                 debugfs_create_file(info->name,
 119                                     info->perm,
 120                                     wilc_dir,
 121                                     &info->data,
 122                                     &info->fops);
 123         }
 124         return 0;
 125 }
 126 module_init(wilc_debugfs_init);
 127
 128 static void __exit wilc_debugfs_remove(void)
 129 {
 130         debugfs_remove_recursive(wilc_dir);
 131 }
 132 module_exit(wilc_debugfs_remove);
 133
 134 #endif