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(struct timer_list *unused)
129{
130	struct cn_msg *m;
131	char data[32];
132
133	pr_debug("%s: timer fired\n", __func__);
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	timer_setup(&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");