1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Debug support for HID Nintendo Wii / Wii U peripherals
4 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
5 */
6
7 /*
8 */
9
10 #include <linux/debugfs.h>
11 #include <linux/module.h>
12 #include <linux/seq_file.h>
13 #include <linux/spinlock.h>
14 #include <linux/uaccess.h>
15 #include "hid-wiimote.h"
16
17 struct wiimote_debug {
18 struct wiimote_data *wdata;
19 struct dentry *eeprom;
20 struct dentry *drm;
21 };
22
wiidebug_eeprom_read(struct file * f,char __user * u,size_t s,loff_t * off)23 static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
24 loff_t *off)
25 {
26 struct wiimote_debug *dbg = f->private_data;
27 struct wiimote_data *wdata = dbg->wdata;
28 unsigned long flags;
29 ssize_t ret;
30 char buf[16];
31 __u16 size = 0;
32
33 if (s == 0)
34 return -EINVAL;
35 if (*off > 0xffffff)
36 return 0;
37 if (s > 16)
38 s = 16;
39
40 ret = wiimote_cmd_acquire(wdata);
41 if (ret)
42 return ret;
43
44 spin_lock_irqsave(&wdata->state.lock, flags);
45 wdata->state.cmd_read_size = s;
46 wdata->state.cmd_read_buf = buf;
47 wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
48 wiiproto_req_reeprom(wdata, *off, s);
49 spin_unlock_irqrestore(&wdata->state.lock, flags);
50
51 ret = wiimote_cmd_wait(wdata);
52 if (!ret)
53 size = wdata->state.cmd_read_size;
54
55 spin_lock_irqsave(&wdata->state.lock, flags);
56 wdata->state.cmd_read_buf = NULL;
57 spin_unlock_irqrestore(&wdata->state.lock, flags);
58
59 wiimote_cmd_release(wdata);
60
61 if (ret)
62 return ret;
63 else if (size == 0)
64 return -EIO;
65
66 if (copy_to_user(u, buf, size))
67 return -EFAULT;
68
69 *off += size;
70 ret = size;
71
72 return ret;
73 }
74
75 static const struct file_operations wiidebug_eeprom_fops = {
76 .owner = THIS_MODULE,
77 .open = simple_open,
78 .read = wiidebug_eeprom_read,
79 .llseek = generic_file_llseek,
80 };
81
82 static const char *wiidebug_drmmap[] = {
83 [WIIPROTO_REQ_NULL] = "NULL",
84 [WIIPROTO_REQ_DRM_K] = "K",
85 [WIIPROTO_REQ_DRM_KA] = "KA",
86 [WIIPROTO_REQ_DRM_KE] = "KE",
87 [WIIPROTO_REQ_DRM_KAI] = "KAI",
88 [WIIPROTO_REQ_DRM_KEE] = "KEE",
89 [WIIPROTO_REQ_DRM_KAE] = "KAE",
90 [WIIPROTO_REQ_DRM_KIE] = "KIE",
91 [WIIPROTO_REQ_DRM_KAIE] = "KAIE",
92 [WIIPROTO_REQ_DRM_E] = "E",
93 [WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
94 [WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
95 [WIIPROTO_REQ_MAX] = NULL
96 };
97
wiidebug_drm_show(struct seq_file * f,void * p)98 static int wiidebug_drm_show(struct seq_file *f, void *p)
99 {
100 struct wiimote_debug *dbg = f->private;
101 const char *str = NULL;
102 unsigned long flags;
103 __u8 drm;
104
105 spin_lock_irqsave(&dbg->wdata->state.lock, flags);
106 drm = dbg->wdata->state.drm;
107 spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
108
109 if (drm < WIIPROTO_REQ_MAX)
110 str = wiidebug_drmmap[drm];
111 if (!str)
112 str = "unknown";
113
114 seq_printf(f, "%s\n", str);
115
116 return 0;
117 }
118
wiidebug_drm_open(struct inode * i,struct file * f)119 static int wiidebug_drm_open(struct inode *i, struct file *f)
120 {
121 return single_open(f, wiidebug_drm_show, i->i_private);
122 }
123
wiidebug_drm_write(struct file * f,const char __user * u,size_t s,loff_t * off)124 static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
125 size_t s, loff_t *off)
126 {
127 struct seq_file *sf = f->private_data;
128 struct wiimote_debug *dbg = sf->private;
129 unsigned long flags;
130 char buf[16];
131 ssize_t len;
132 int i;
133
134 if (s == 0)
135 return -EINVAL;
136
137 len = min((size_t) 15, s);
138 if (copy_from_user(buf, u, len))
139 return -EFAULT;
140
141 buf[len] = 0;
142
143 for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
144 if (!wiidebug_drmmap[i])
145 continue;
146 if (!strcasecmp(buf, wiidebug_drmmap[i]))
147 break;
148 }
149
150 if (i == WIIPROTO_REQ_MAX)
151 i = simple_strtoul(buf, NULL, 16);
152
153 spin_lock_irqsave(&dbg->wdata->state.lock, flags);
154 dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
155 wiiproto_req_drm(dbg->wdata, (__u8) i);
156 if (i != WIIPROTO_REQ_NULL)
157 dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
158 spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
159
160 return len;
161 }
162
163 static const struct file_operations wiidebug_drm_fops = {
164 .owner = THIS_MODULE,
165 .open = wiidebug_drm_open,
166 .read = seq_read,
167 .llseek = seq_lseek,
168 .write = wiidebug_drm_write,
169 .release = single_release,
170 };
171
wiidebug_init(struct wiimote_data * wdata)172 int wiidebug_init(struct wiimote_data *wdata)
173 {
174 struct wiimote_debug *dbg;
175 unsigned long flags;
176
177 dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
178 if (!dbg)
179 return -ENOMEM;
180
181 dbg->wdata = wdata;
182
183 dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
184 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
185
186 dbg->drm = debugfs_create_file("drm", S_IRUSR,
187 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
188
189 spin_lock_irqsave(&wdata->state.lock, flags);
190 wdata->debug = dbg;
191 spin_unlock_irqrestore(&wdata->state.lock, flags);
192
193 return 0;
194
195 }
196
wiidebug_deinit(struct wiimote_data * wdata)197 void wiidebug_deinit(struct wiimote_data *wdata)
198 {
199 struct wiimote_debug *dbg = wdata->debug;
200 unsigned long flags;
201
202 if (!dbg)
203 return;
204
205 spin_lock_irqsave(&wdata->state.lock, flags);
206 wdata->debug = NULL;
207 spin_unlock_irqrestore(&wdata->state.lock, flags);
208
209 debugfs_remove(dbg->drm);
210 debugfs_remove(dbg->eeprom);
211 kfree(dbg);
212 }
213