1 /*
2  * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 
19 #include <linux/debugfs.h>
20 #include <linux/uaccess.h>
21 #include "wcn36xx.h"
22 #include "debug.h"
23 #include "pmc.h"
24 
25 #ifdef CONFIG_WCN36XX_DEBUGFS
26 
27 static ssize_t read_file_bool_bmps(struct file *file, char __user *user_buf,
28 				   size_t count, loff_t *ppos)
29 {
30 	struct wcn36xx *wcn = file->private_data;
31 	struct wcn36xx_vif *vif_priv = NULL;
32 	struct ieee80211_vif *vif = NULL;
33 	char buf[3];
34 
35 	list_for_each_entry(vif_priv, &wcn->vif_list, list) {
36 			vif = wcn36xx_priv_to_vif(vif_priv);
37 			if (NL80211_IFTYPE_STATION == vif->type) {
38 				if (vif_priv->pw_state == WCN36XX_BMPS)
39 					buf[0] = '1';
40 				else
41 					buf[0] = '0';
42 				break;
43 			}
44 	}
45 	buf[1] = '\n';
46 	buf[2] = 0x00;
47 
48 	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
49 }
50 
51 static ssize_t write_file_bool_bmps(struct file *file,
52 				    const char __user *user_buf,
53 				    size_t count, loff_t *ppos)
54 {
55 	struct wcn36xx *wcn = file->private_data;
56 	struct wcn36xx_vif *vif_priv = NULL;
57 	struct ieee80211_vif *vif = NULL;
58 
59 	char buf[32];
60 	int buf_size;
61 
62 	buf_size = min(count, (sizeof(buf)-1));
63 	if (copy_from_user(buf, user_buf, buf_size))
64 		return -EFAULT;
65 
66 	switch (buf[0]) {
67 	case 'y':
68 	case 'Y':
69 	case '1':
70 		list_for_each_entry(vif_priv, &wcn->vif_list, list) {
71 			vif = wcn36xx_priv_to_vif(vif_priv);
72 			if (NL80211_IFTYPE_STATION == vif->type) {
73 				wcn36xx_enable_keep_alive_null_packet(wcn, vif);
74 				wcn36xx_pmc_enter_bmps_state(wcn, vif);
75 			}
76 		}
77 		break;
78 	case 'n':
79 	case 'N':
80 	case '0':
81 		list_for_each_entry(vif_priv, &wcn->vif_list, list) {
82 			vif = wcn36xx_priv_to_vif(vif_priv);
83 			if (NL80211_IFTYPE_STATION == vif->type)
84 				wcn36xx_pmc_exit_bmps_state(wcn, vif);
85 		}
86 		break;
87 	}
88 
89 	return count;
90 }
91 
92 static const struct file_operations fops_wcn36xx_bmps = {
93 	.open = simple_open,
94 	.read  =       read_file_bool_bmps,
95 	.write =       write_file_bool_bmps,
96 };
97 
98 static ssize_t write_file_dump(struct file *file,
99 				    const char __user *user_buf,
100 				    size_t count, loff_t *ppos)
101 {
102 	struct wcn36xx *wcn = file->private_data;
103 	char buf[255], *tmp;
104 	int buf_size;
105 	u32 arg[WCN36xx_MAX_DUMP_ARGS];
106 	int i;
107 
108 	memset(buf, 0, sizeof(buf));
109 	memset(arg, 0, sizeof(arg));
110 
111 	buf_size = min(count, (sizeof(buf) - 1));
112 	if (copy_from_user(buf, user_buf, buf_size))
113 		return -EFAULT;
114 
115 	tmp = buf;
116 
117 	for (i = 0; i < WCN36xx_MAX_DUMP_ARGS; i++) {
118 		char *begin;
119 		begin = strsep(&tmp, " ");
120 		if (begin == NULL)
121 			break;
122 
123 		if (kstrtou32(begin, 0, &arg[i]) != 0)
124 			break;
125 	}
126 
127 	wcn36xx_info("DUMP args is %d %d %d %d %d\n", arg[0], arg[1], arg[2],
128 		     arg[3], arg[4]);
129 	wcn36xx_smd_dump_cmd_req(wcn, arg[0], arg[1], arg[2], arg[3], arg[4]);
130 
131 	return count;
132 }
133 
134 static const struct file_operations fops_wcn36xx_dump = {
135 	.open = simple_open,
136 	.write =       write_file_dump,
137 };
138 
139 #define ADD_FILE(name, mode, fop, priv_data)		\
140 	do {							\
141 		struct dentry *d;				\
142 		d = debugfs_create_file(__stringify(name),	\
143 					mode, dfs->rootdir,	\
144 					priv_data, fop);	\
145 		dfs->file_##name.dentry = d;			\
146 		if (IS_ERR(d)) {				\
147 			wcn36xx_warn("Create the debugfs entry failed");\
148 			dfs->file_##name.dentry = NULL;		\
149 		}						\
150 	} while (0)
151 
152 
153 void wcn36xx_debugfs_init(struct wcn36xx *wcn)
154 {
155 	struct wcn36xx_dfs_entry *dfs = &wcn->dfs;
156 
157 	dfs->rootdir = debugfs_create_dir(KBUILD_MODNAME,
158 					  wcn->hw->wiphy->debugfsdir);
159 	if (IS_ERR(dfs->rootdir)) {
160 		wcn36xx_warn("Create the debugfs failed\n");
161 		dfs->rootdir = NULL;
162 	}
163 
164 	ADD_FILE(bmps_switcher, S_IRUSR | S_IWUSR,
165 		 &fops_wcn36xx_bmps, wcn);
166 	ADD_FILE(dump, S_IWUSR, &fops_wcn36xx_dump, wcn);
167 }
168 
169 void wcn36xx_debugfs_exit(struct wcn36xx *wcn)
170 {
171 	struct wcn36xx_dfs_entry *dfs = &wcn->dfs;
172 	debugfs_remove_recursive(dfs->rootdir);
173 }
174 
175 #endif /* CONFIG_WCN36XX_DEBUGFS */
176