LXR linux/drivers/staging/wilc1000/wilc

   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
  20static 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)
  31static atomic_t WILC_DEBUG_LEVEL = ATOMIC_INIT(ERR);
  32EXPORT_SYMBOL_GPL(WILC_DEBUG_LEVEL);
  33
  34/*
  35 * ----------------------------------------------------------------------------
  36 */
  37
  38static 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
  54static 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
  93struct wilc_debugfs_info_t {
  94        const char *name;
  95        int perm;
  96        unsigned int data;
  97        const struct file_operations fops;
  98};
  99
 100static 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
 109static 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}
 125module_init(wilc_debugfs_init);
 126
 127static void __exit wilc_debugfs_remove(void)
 128{
 129        debugfs_remove_recursive(wilc_dir);
 130}
 131module_exit(wilc_debugfs_remove);
 132
 133#endif
 134