1/*
2 * 	cn_test.c
3 *
4 * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 */
21
22#define pr_fmt(fmt) "cn_test: " fmt
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/skbuff.h>
28#include <linux/slab.h>
29#include <linux/timer.h>
30
31#include <linux/connector.h>
32
33static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
34static char cn_test_name[] = "cn_test";
35static struct sock *nls;
36static struct timer_list cn_test_timer;
37
38static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
39{
40	pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
41	        __func__, jiffies, msg->id.idx, msg->id.val,
42	        msg->seq, msg->ack, msg->len,
43	        msg->len ? (char *)msg->data : "");
44}
45
46/*
47 * Do not remove this function even if no one is using it as
48 * this is an example of how to get notifications about new
49 * connector user registration
50 */
51#if 0
52static int cn_test_want_notify(void)
53{
54	struct cn_ctl_msg *ctl;
55	struct cn_notify_req *req;
56	struct cn_msg *msg = NULL;
57	int size, size0;
58	struct sk_buff *skb;
59	struct nlmsghdr *nlh;
60	u32 group = 1;
61
62	size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
63
64	size = NLMSG_SPACE(size0);
65
66	skb = alloc_skb(size, GFP_ATOMIC);
67	if (!skb) {
68		pr_err("failed to allocate new skb with size=%u\n", size);
69		return -ENOMEM;
70	}
71
72	nlh = nlmsg_put(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh), 0);
73	if (!nlh) {
74		kfree_skb(skb);
75		return -EMSGSIZE;
76	}
77
78	msg = nlmsg_data(nlh);
79
80	memset(msg, 0, size0);
81
82	msg->id.idx = -1;
83	msg->id.val = -1;
84	msg->seq = 0x123;
85	msg->ack = 0x345;
86	msg->len = size0 - sizeof(*msg);
87
88	ctl = (struct cn_ctl_msg *)(msg + 1);
89
90	ctl->idx_notify_num = 1;
91	ctl->val_notify_num = 2;
92	ctl->group = group;
93	ctl->len = msg->len - sizeof(*ctl);
94
95	req = (struct cn_notify_req *)(ctl + 1);
96
97	/*
98	 * Idx.
99	 */
100	req->first = cn_test_id.idx;
101	req->range = 10;
102
103	/*
104	 * Val 0.
105	 */
106	req++;
107	req->first = cn_test_id.val;
108	req->range = 10;
109
110	/*
111	 * Val 1.
112	 */
113	req++;
114	req->first = cn_test_id.val + 20;
115	req->range = 10;
116
117	NETLINK_CB(skb).dst_group = ctl->group;
118	//netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
119	netlink_unicast(nls, skb, 0, 0);
120
121	pr_info("request was sent: group=0x%x\n", ctl->group);
122
123	return 0;
124}
125#endif
126
127static u32 cn_test_timer_counter;
128static void cn_test_timer_func(unsigned long __data)
129{
130	struct cn_msg *m;
131	char data[32];
132
133	pr_debug("%s: timer fired with data %lu\n", __func__, __data);
134
135	m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
136	if (m) {
137
138		memcpy(&m->id, &cn_test_id, sizeof(m->id));
139		m->seq = cn_test_timer_counter;
140		m->len = sizeof(data);
141
142		m->len =
143		    scnprintf(data, sizeof(data), "counter = %u",
144			      cn_test_timer_counter) + 1;
145
146		memcpy(m + 1, data, m->len);
147
148		cn_netlink_send(m, 0, 0, GFP_ATOMIC);
149		kfree(m);
150	}
151
152	cn_test_timer_counter++;
153
154	mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
155}
156
157static int cn_test_init(void)
158{
159	int err;
160
161	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
162	if (err)
163		goto err_out;
164	cn_test_id.val++;
165	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
166	if (err) {
167		cn_del_callback(&cn_test_id);
168		goto err_out;
169	}
170
171	setup_timer(&cn_test_timer, cn_test_timer_func, 0);
172	mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
173
174	pr_info("initialized with id={%u.%u}\n",
175		cn_test_id.idx, cn_test_id.val);
176
177	return 0;
178
179      err_out:
180	if (nls && nls->sk_socket)
181		sock_release(nls->sk_socket);
182
183	return err;
184}
185
186static void cn_test_fini(void)
187{
188	del_timer_sync(&cn_test_timer);
189	cn_del_callback(&cn_test_id);
190	cn_test_id.val--;
191	cn_del_callback(&cn_test_id);
192	if (nls && nls->sk_socket)
193		sock_release(nls->sk_socket);
194}
195
196module_init(cn_test_init);
197module_exit(cn_test_fini);
198
199MODULE_LICENSE("GPL");
200MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
201MODULE_DESCRIPTION("Connector's test module");
202