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
17struct wiimote_debug {
18	struct wiimote_data *wdata;
19	struct dentry *eeprom;
20	struct dentry *drm;
21};
22
23static 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
75static 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
82static 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
98static 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
119static int wiidebug_drm_open(struct inode *i, struct file *f)
120{
121	return single_open(f, wiidebug_drm_show, i->i_private);
122}
123
124static 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
163static 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
172int 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
197void 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