linux/Documentation/connector/cn_test.c
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   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, 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
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