xref: /linux/drivers/hid/hid-wiimote-debug.c (revision b43ab901d671e3e3cad425ea5e9a3c74e266dcdd)
1 /*
2  * Debug support for HID Nintendo Wiimote devices
3  * Copyright (c) 2011 David Herrmann
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 
20 struct wiimote_debug {
21 	struct wiimote_data *wdata;
22 	struct dentry *eeprom;
23 	struct dentry *drm;
24 };
25 
26 static int wiidebug_eeprom_open(struct inode *i, struct file *f)
27 {
28 	f->private_data = i->i_private;
29 	return 0;
30 }
31 
32 static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
33 								loff_t *off)
34 {
35 	struct wiimote_debug *dbg = f->private_data;
36 	struct wiimote_data *wdata = dbg->wdata;
37 	unsigned long flags;
38 	ssize_t ret;
39 	char buf[16];
40 	__u16 size;
41 
42 	if (s == 0)
43 		return -EINVAL;
44 	if (*off > 0xffffff)
45 		return 0;
46 	if (s > 16)
47 		s = 16;
48 
49 	ret = wiimote_cmd_acquire(wdata);
50 	if (ret)
51 		return ret;
52 
53 	spin_lock_irqsave(&wdata->state.lock, flags);
54 	wdata->state.cmd_read_size = s;
55 	wdata->state.cmd_read_buf = buf;
56 	wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
57 	wiiproto_req_reeprom(wdata, *off, s);
58 	spin_unlock_irqrestore(&wdata->state.lock, flags);
59 
60 	ret = wiimote_cmd_wait(wdata);
61 	if (!ret)
62 		size = wdata->state.cmd_read_size;
63 
64 	spin_lock_irqsave(&wdata->state.lock, flags);
65 	wdata->state.cmd_read_buf = NULL;
66 	spin_unlock_irqrestore(&wdata->state.lock, flags);
67 
68 	wiimote_cmd_release(wdata);
69 
70 	if (ret)
71 		return ret;
72 	else if (size == 0)
73 		return -EIO;
74 
75 	if (copy_to_user(u, buf, size))
76 		return -EFAULT;
77 
78 	*off += size;
79 	ret = size;
80 
81 	return ret;
82 }
83 
84 static const struct file_operations wiidebug_eeprom_fops = {
85 	.owner = THIS_MODULE,
86 	.open = wiidebug_eeprom_open,
87 	.read = wiidebug_eeprom_read,
88 	.llseek = generic_file_llseek,
89 };
90 
91 static const char *wiidebug_drmmap[] = {
92 	[WIIPROTO_REQ_NULL] = "NULL",
93 	[WIIPROTO_REQ_DRM_K] = "K",
94 	[WIIPROTO_REQ_DRM_KA] = "KA",
95 	[WIIPROTO_REQ_DRM_KE] = "KE",
96 	[WIIPROTO_REQ_DRM_KAI] = "KAI",
97 	[WIIPROTO_REQ_DRM_KEE] = "KEE",
98 	[WIIPROTO_REQ_DRM_KAE] = "KAE",
99 	[WIIPROTO_REQ_DRM_KIE] = "KIE",
100 	[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
101 	[WIIPROTO_REQ_DRM_E] = "E",
102 	[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
103 	[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
104 	[WIIPROTO_REQ_MAX] = NULL
105 };
106 
107 static int wiidebug_drm_show(struct seq_file *f, void *p)
108 {
109 	struct wiimote_debug *dbg = f->private;
110 	const char *str = NULL;
111 	unsigned long flags;
112 	__u8 drm;
113 
114 	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
115 	drm = dbg->wdata->state.drm;
116 	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
117 
118 	if (drm < WIIPROTO_REQ_MAX)
119 		str = wiidebug_drmmap[drm];
120 	if (!str)
121 		str = "unknown";
122 
123 	seq_printf(f, "%s\n", str);
124 
125 	return 0;
126 }
127 
128 static int wiidebug_drm_open(struct inode *i, struct file *f)
129 {
130 	return single_open(f, wiidebug_drm_show, i->i_private);
131 }
132 
133 static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
134 							size_t s, loff_t *off)
135 {
136 	struct wiimote_debug *dbg = f->private_data;
137 	unsigned long flags;
138 	char buf[16];
139 	ssize_t len;
140 	int i;
141 
142 	if (s == 0)
143 		return -EINVAL;
144 
145 	len = min((size_t) 15, s);
146 	if (copy_from_user(buf, u, len))
147 		return -EFAULT;
148 
149 	buf[15] = 0;
150 
151 	for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
152 		if (!wiidebug_drmmap[i])
153 			continue;
154 		if (!strcasecmp(buf, wiidebug_drmmap[i]))
155 			break;
156 	}
157 
158 	if (i == WIIPROTO_REQ_MAX)
159 		i = simple_strtoul(buf, NULL, 10);
160 
161 	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
162 	wiiproto_req_drm(dbg->wdata, (__u8) i);
163 	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
164 
165 	return len;
166 }
167 
168 static const struct file_operations wiidebug_drm_fops = {
169 	.owner = THIS_MODULE,
170 	.open = wiidebug_drm_open,
171 	.read = seq_read,
172 	.llseek = seq_lseek,
173 	.write = wiidebug_drm_write,
174 	.release = single_release,
175 };
176 
177 int wiidebug_init(struct wiimote_data *wdata)
178 {
179 	struct wiimote_debug *dbg;
180 	unsigned long flags;
181 	int ret = -ENOMEM;
182 
183 	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
184 	if (!dbg)
185 		return -ENOMEM;
186 
187 	dbg->wdata = wdata;
188 
189 	dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
190 		dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
191 	if (!dbg->eeprom)
192 		goto err;
193 
194 	dbg->drm = debugfs_create_file("drm", S_IRUSR,
195 			dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
196 	if (!dbg->drm)
197 		goto err_drm;
198 
199 	spin_lock_irqsave(&wdata->state.lock, flags);
200 	wdata->debug = dbg;
201 	spin_unlock_irqrestore(&wdata->state.lock, flags);
202 
203 	return 0;
204 
205 err_drm:
206 	debugfs_remove(dbg->eeprom);
207 err:
208 	kfree(dbg);
209 	return ret;
210 }
211 
212 void wiidebug_deinit(struct wiimote_data *wdata)
213 {
214 	struct wiimote_debug *dbg = wdata->debug;
215 	unsigned long flags;
216 
217 	if (!dbg)
218 		return;
219 
220 	spin_lock_irqsave(&wdata->state.lock, flags);
221 	wdata->debug = NULL;
222 	spin_unlock_irqrestore(&wdata->state.lock, flags);
223 
224 	debugfs_remove(dbg->drm);
225 	debugfs_remove(dbg->eeprom);
226 	kfree(dbg);
227 }
228