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
wilc_debug_level_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)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
wilc_debug_level_write(struct file * filp,const char __user * buf,size_t count,loff_t * ppos)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
wilc_debugfs_init(void)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
wilc_debugfs_remove(void)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
116
