aboutsummaryrefslogtreecommitdiff
path: root/drivers/hid/hid-wiimote-debug.c
blob: 90124ffaa2a5211f3e7e11ec7c4a21aedd18b054 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 * Debug support for HID Nintendo Wiimote devices
 * Copyright (c) 2011 David Herrmann
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include "hid-wiimote.h"

struct wiimote_debug {
	struct wiimote_data *wdata;
	struct dentry *eeprom;
	struct dentry *drm;
};

static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
								loff_t *off)
{
	struct wiimote_debug *dbg = f->private_data;
	struct wiimote_data *wdata = dbg->wdata;
	unsigned long flags;
	ssize_t ret;
	char buf[16];
	__u16 size = 0;

	if (s == 0)
		return -EINVAL;
	if (*off > 0xffffff)
		return 0;
	if (s > 16)
		s = 16;

	ret = wiimote_cmd_acquire(wdata);
	if (ret)
		return ret;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->state.cmd_read_size = s;
	wdata->state.cmd_read_buf = buf;
	wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
	wiiproto_req_reeprom(wdata, *off, s);
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	ret = wiimote_cmd_wait(wdata);
	if (!ret)
		size = wdata->state.cmd_read_size;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->state.cmd_read_buf = NULL;
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	wiimote_cmd_release(wdata);

	if (ret)
		return ret;
	else if (size == 0)
		return -EIO;

	if (copy_to_user(u, buf, size))
		return -EFAULT;

	*off += size;
	ret = size;

	return ret;
}

static const struct file_operations wiidebug_eeprom_fops = {
	.owner = THIS_MODULE,
	.open = simple_open,
	.read = wiidebug_eeprom_read,
	.llseek = generic_file_llseek,
};

static const char *wiidebug_drmmap[] = {
	[WIIPROTO_REQ_NULL] = "NULL",
	[WIIPROTO_REQ_DRM_K] = "K",
	[WIIPROTO_REQ_DRM_KA] = "KA",
	[WIIPROTO_REQ_DRM_KE] = "KE",
	[WIIPROTO_REQ_DRM_KAI] = "KAI",
	[WIIPROTO_REQ_DRM_KEE] = "KEE",
	[WIIPROTO_REQ_DRM_KAE] = "KAE",
	[WIIPROTO_REQ_DRM_KIE] = "KIE",
	[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
	[WIIPROTO_REQ_DRM_E] = "E",
	[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
	[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
	[WIIPROTO_REQ_MAX] = NULL
};

static int wiidebug_drm_show(struct seq_file *f, void *p)
{
	struct wiimote_debug *dbg = f->private;
	const char *str = NULL;
	unsigned long flags;
	__u8 drm;

	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
	drm = dbg->wdata->state.drm;
	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);

	if (drm < WIIPROTO_REQ_MAX)
		str = wiidebug_drmmap[drm];
	if (!str)
		str = "unknown";

	seq_printf(f, "%s\n", str);

	return 0;
}

static int wiidebug_drm_open(struct inode *i, struct file *f)
{
	return single_open(f, wiidebug_drm_show, i->i_private);
}

static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
							size_t s, loff_t *off)
{
	struct wiimote_debug *dbg = f->private_data;
	unsigned long flags;
	char buf[16];
	ssize_t len;
	int i;

	if (s == 0)
		return -EINVAL;

	len = min((size_t) 15, s);
	if (copy_from_user(buf, u, len))
		return -EFAULT;

	buf[15] = 0;

	for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
		if (!wiidebug_drmmap[i])
			continue;
		if (!strcasecmp(buf, wiidebug_drmmap[i]))
			break;
	}

	if (i == WIIPROTO_REQ_MAX)
		i = simple_strtoul(buf, NULL, 10);

	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
	wiiproto_req_drm(dbg->wdata, (__u8) i);
	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);

	return len;
}

static const struct file_operations wiidebug_drm_fops = {
	.owner = THIS_MODULE,
	.open = wiidebug_drm_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.write = wiidebug_drm_write,
	.release = single_release,
};

int wiidebug_init(struct wiimote_data *wdata)
{
	struct wiimote_debug *dbg;
	unsigned long flags;
	int ret = -ENOMEM;

	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
	if (!dbg)
		return -ENOMEM;

	dbg->wdata = wdata;

	dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
		dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
	if (!dbg->eeprom)
		goto err;

	dbg->drm = debugfs_create_file("drm", S_IRUSR,
			dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
	if (!dbg->drm)
		goto err_drm;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->debug = dbg;
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	return 0;

err_drm:
	debugfs_remove(dbg->eeprom);
err:
	kfree(dbg);
	return ret;
}

void wiidebug_deinit(struct wiimote_data *wdata)
{
	struct wiimote_debug *dbg = wdata->debug;
	unsigned long flags;

	if (!dbg)
		return;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->debug = NULL;
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	debugfs_remove(dbg->drm);
	debugfs_remove(dbg->eeprom);
	kfree(dbg);
}