drivers/staging/wilc1000/wilc_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiaries.
   4  * All rights reserved.
   5  */
   6
   7 #if defined(WILC_DEBUGFS)
   8 #include <linux/module.h>
   9 #include <linux/debugfs.h>
  10
  11 #include "wilc_wlan_if.h"
  12
  13 static struct dentry *wilc_dir;
  14
  15 #define DEBUG           BIT(0)
  16 #define INFO            BIT(1)
  17 #define WRN             BIT(2)
  18 #define ERR             BIT(3)
  19
  20 #define DBG_LEVEL_ALL   (DEBUG | INFO | WRN | ERR)
  21 static atomic_t WILC_DEBUG_LEVEL = ATOMIC_INIT(ERR);
  22 EXPORT_SYMBOL_GPL(WILC_DEBUG_LEVEL);
  23
  24 static ssize_t wilc_debug_level_read(struct file *file, char __user *userbuf,
  25                                      size_t count, loff_t *ppos)
  26 {
  27         char buf[128];
  28         int res = 0;
  29
  30         /* only allow read from start */
  31         if (*ppos > 0)
  32                 return 0;
  33
  34         res = scnprintf(buf, sizeof(buf), "Debug Level: %x\n",
  35                         atomic_read(&WILC_DEBUG_LEVEL));
  36
  37         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  38 }
  39
  40 static ssize_t wilc_debug_level_write(struct file *filp,
  41                                       const char __user *buf, size_t count,
  42                                       loff_t *ppos)
  43 {
  44         int flag = 0;
  45         int ret;
  46
  47         ret = kstrtouint_from_user(buf, count, 16, &flag);
  48         if (ret)
  49                 return ret;
  50
  51         if (flag > DBG_LEVEL_ALL) {
  52                 pr_info("%s, value (0x%08x) is out of range, stay previous flag (0x%08x)\n",
  53                         __func__, flag, atomic_read(&WILC_DEBUG_LEVEL));
  54                 return -EINVAL;
  55         }
  56
  57         atomic_set(&WILC_DEBUG_LEVEL, (int)flag);
  58
  59         if (flag == 0)
  60                 pr_info("Debug-level disabled\n");
  61         else
  62                 pr_info("Debug-level enabled\n");
  63
  64         return count;
  65 }
  66
  67 #define FOPS(_open, _read, _write, _poll) { \
  68                 .owner  = THIS_MODULE, \
  69                 .open   = (_open), \
  70                 .read   = (_read), \
  71                 .write  = (_write), \
  72                 .poll           = (_poll), \
  73 }
  74
  75 struct wilc_debugfs_info_t {
  76         const char *name;
  77         int perm;
  78         unsigned int data;
  79         const struct file_operations fops;
  80 };
  81
  82 static struct wilc_debugfs_info_t debugfs_info[] = {
  83         {
  84                 "wilc_debug_level",
  85                 0666,
  86                 (DEBUG | ERR),
  87                 FOPS(NULL, wilc_debug_level_read, wilc_debug_level_write, NULL),
  88         },
  89 };
  90
  91 static int __init wilc_debugfs_init(void)
  92 {
  93         int i;
  94         struct wilc_debugfs_info_t *info;
  95
  96         wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
  97         for (i = 0; i < ARRAY_SIZE(debugfs_info); i++) {
  98                 info = &debugfs_info[i];
  99                 debugfs_create_file(info->name,
 100                                     info->perm,
 101                                     wilc_dir,
 102                                     &info->data,
 103                                     &info->fops);
 104         }
 105         return 0;
 106 }
 107 module_init(wilc_debugfs_init);
 108
 109 static void __exit wilc_debugfs_remove(void)
 110 {
 111         debugfs_remove_recursive(wilc_dir);
 112 }
 113 module_exit(wilc_debugfs_remove);
 114
 115 #endif