1/*
2 * Debug support for HID Nintendo Wii / Wii U peripherals
3 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
4 */
5
6/*
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 */
12
13#include <linux/debugfs.h>
14#include <linux/module.h>
15#include <linux/seq_file.h>
16#include <linux/spinlock.h>
17#include <linux/uaccess.h>
18#include "hid-wiimote.h"
19
20struct wiimote_debug {
21 struct wiimote_data *wdata;
22 struct dentry *eeprom;
23 struct dentry *drm;
24};
25
26static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
27 loff_t *off)
28{
29 struct wiimote_debug *dbg = f->private_data;
30 struct wiimote_data *wdata = dbg->wdata;
31 unsigned long flags;
32 ssize_t ret;
33 char buf[16];
34 __u16 size = 0;
35
36 if (s == 0)
37 return -EINVAL;
38 if (*off > 0xffffff)
39 return 0;
40 if (s > 16)
41 s = 16;
42
43 ret = wiimote_cmd_acquire(wdata);
44 if (ret)
45 return ret;
46
47 spin_lock_irqsave(&wdata->state.lock, flags);
48 wdata->state.cmd_read_size = s;
49 wdata->state.cmd_read_buf = buf;
50 wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
51 wiiproto_req_reeprom(wdata, *off, s);
52 spin_unlock_irqrestore(&wdata->state.lock, flags);
53
54 ret = wiimote_cmd_wait(wdata);
55 if (!ret)
56 size = wdata->state.cmd_read_size;
57
58 spin_lock_irqsave(&wdata->state.lock, flags);
59 wdata->state.cmd_read_buf = NULL;
60 spin_unlock_irqrestore(&wdata->state.lock, flags);
61
62 wiimote_cmd_release(wdata);
63
64 if (ret)
65 return ret;
66 else if (size == 0)
67 return -EIO;
68
69 if (copy_to_user(u, buf, size))
70 return -EFAULT;
71
72 *off += size;
73 ret = size;
74
75 return ret;
76}
77
78static const struct file_operations wiidebug_eeprom_fops = {
79 .owner = THIS_MODULE,
80 .open = simple_open,
81 .read = wiidebug_eeprom_read,
82 .llseek = generic_file_llseek,
83};
84
85static const char *wiidebug_drmmap[] = {
86 [WIIPROTO_REQ_NULL] = "NULL",
87 [WIIPROTO_REQ_DRM_K] = "K",
88 [WIIPROTO_REQ_DRM_KA] = "KA",
89 [WIIPROTO_REQ_DRM_KE] = "KE",
90 [WIIPROTO_REQ_DRM_KAI] = "KAI",
91 [WIIPROTO_REQ_DRM_KEE] = "KEE",
92 [WIIPROTO_REQ_DRM_KAE] = "KAE",
93 [WIIPROTO_REQ_DRM_KIE] = "KIE",
94 [WIIPROTO_REQ_DRM_KAIE] = "KAIE",
95 [WIIPROTO_REQ_DRM_E] = "E",
96 [WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
97 [WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
98 [WIIPROTO_REQ_MAX] = NULL
99};
100
101static int wiidebug_drm_show(struct seq_file *f, void *p)
102{
103 struct wiimote_debug *dbg = f->private;
104 const char *str = NULL;
105 unsigned long flags;
106 __u8 drm;
107
108 spin_lock_irqsave(&dbg->wdata->state.lock, flags);
109 drm = dbg->wdata->state.drm;
110 spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
111
112 if (drm < WIIPROTO_REQ_MAX)
113 str = wiidebug_drmmap[drm];
114 if (!str)
115 str = "unknown";
116
117 seq_printf(f, "%s\n", str);
118
119 return 0;
120}
121
122static int wiidebug_drm_open(struct inode *i, struct file *f)
123{
124 return single_open(f, wiidebug_drm_show, i->i_private);
125}
126
127static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
128 size_t s, loff_t *off)
129{
130 struct seq_file *sf = f->private_data;
131 struct wiimote_debug *dbg = sf->private;
132 unsigned long flags;
133 char buf[16];
134 ssize_t len;
135 int i;
136
137 if (s == 0)
138 return -EINVAL;
139
140 len = min((size_t) 15, s);
141 if (copy_from_user(buf, u, len))
142 return -EFAULT;
143
144 buf[len] = 0;
145
146 for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
147 if (!wiidebug_drmmap[i])
148 continue;
149 if (!strcasecmp(buf, wiidebug_drmmap[i]))
150 break;
151 }
152
153 if (i == WIIPROTO_REQ_MAX)
154 i = simple_strtoul(buf, NULL, 16);
155
156 spin_lock_irqsave(&dbg->wdata->state.lock, flags);
157 dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
158 wiiproto_req_drm(dbg->wdata, (__u8) i);
159 if (i != WIIPROTO_REQ_NULL)
160 dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
161 spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
162
163 return len;
164}
165
166static const struct file_operations wiidebug_drm_fops = {
167 .owner = THIS_MODULE,
168 .open = wiidebug_drm_open,
169 .read = seq_read,
170 .llseek = seq_lseek,
171 .write = wiidebug_drm_write,
172 .release = single_release,
173};
174
175int wiidebug_init(struct wiimote_data *wdata)
176{
177 struct wiimote_debug *dbg;
178 unsigned long flags;
179 int ret = -ENOMEM;
180
181 dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
182 if (!dbg)
183 return -ENOMEM;
184
185 dbg->wdata = wdata;
186
187 dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
188 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
189 if (!dbg->eeprom)
190 goto err;
191
192 dbg->drm = debugfs_create_file("drm", S_IRUSR,
193 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
194 if (!dbg->drm)
195 goto err_drm;
196
197 spin_lock_irqsave(&wdata->state.lock, flags);
198 wdata->debug = dbg;
199 spin_unlock_irqrestore(&wdata->state.lock, flags);
200
201 return 0;
202
203err_drm:
204 debugfs_remove(dbg->eeprom);
205err:
206 kfree(dbg);
207 return ret;
208}
209
210void wiidebug_deinit(struct wiimote_data *wdata)
211{
212 struct wiimote_debug *dbg = wdata->debug;
213 unsigned long flags;
214
215 if (!dbg)
216 return;
217
218 spin_lock_irqsave(&wdata->state.lock, flags);
219 wdata->debug = NULL;
220 spin_unlock_irqrestore(&wdata->state.lock, flags);
221
222 debugfs_remove(dbg->drm);
223 debugfs_remove(dbg->eeprom);
224 kfree(dbg);
225}
226