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Based on kernel version 3.16. Page generated on 2014-08-06 21:36 EST.

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	
33	static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
34	static char cn_test_name[] = "cn_test";
35	static struct sock *nls;
36	static struct timer_list cn_test_timer;
37	
38	static 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
52	static 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	
127	static u32 cn_test_timer_counter;
128	static 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	
157	static 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	
186	static 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	
196	module_init(cn_test_init);
197	module_exit(cn_test_fini);
198	
199	MODULE_LICENSE("GPL");
200	MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
201	MODULE_DESCRIPTION("Connector's test module");
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