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
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;
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 wiimote_debug *dbg = f->private_data;
131	unsigned long flags;
132	char buf[16];
133	ssize_t len;
134	int i;
135
136	if (s == 0)
137		return -EINVAL;
138
139	len = min((size_t) 15, s);
140	if (copy_from_user(buf, u, len))
141		return -EFAULT;
142
143	buf[15] = 0;
144
145	for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
146		if (!wiidebug_drmmap[i])
147			continue;
148		if (!strcasecmp(buf, wiidebug_drmmap[i]))
149			break;
150	}
151
152	if (i == WIIPROTO_REQ_MAX)
153		i = simple_strtoul(buf, NULL, 10);
154
155	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
156	wiiproto_req_drm(dbg->wdata, (__u8) i);
157	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
158
159	return len;
160}
161
162static const struct file_operations wiidebug_drm_fops = {
163	.owner = THIS_MODULE,
164	.open = wiidebug_drm_open,
165	.read = seq_read,
166	.llseek = seq_lseek,
167	.write = wiidebug_drm_write,
168	.release = single_release,
169};
170
171int wiidebug_init(struct wiimote_data *wdata)
172{
173	struct wiimote_debug *dbg;
174	unsigned long flags;
175	int ret = -ENOMEM;
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	if (!dbg->eeprom)
186		goto err;
187
188	dbg->drm = debugfs_create_file("drm", S_IRUSR,
189			dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
190	if (!dbg->drm)
191		goto err_drm;
192
193	spin_lock_irqsave(&wdata->state.lock, flags);
194	wdata->debug = dbg;
195	spin_unlock_irqrestore(&wdata->state.lock, flags);
196
197	return 0;
198
199err_drm:
200	debugfs_remove(dbg->eeprom);
201err:
202	kfree(dbg);
203	return ret;
204}
205
206void wiidebug_deinit(struct wiimote_data *wdata)
207{
208	struct wiimote_debug *dbg = wdata->debug;
209	unsigned long flags;
210
211	if (!dbg)
212		return;
213
214	spin_lock_irqsave(&wdata->state.lock, flags);
215	wdata->debug = NULL;
216	spin_unlock_irqrestore(&wdata->state.lock, flags);
217
218	debugfs_remove(dbg->drm);
219	debugfs_remove(dbg->eeprom);
220	kfree(dbg);
221}
222