drivers/w1/w1_netlink.c

   1 /*
   2  * w1_netlink.c
   3  *
   4  * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   5  *
   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 #include <linux/skbuff.h>
  23 #include <linux/netlink.h>
  24
  25 #include "w1.h"
  26 #include "w1_log.h"
  27 #include "w1_netlink.h"
  28
  29 #ifndef NETLINK_DISABLED
  30 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
  31 {
  32         unsigned int size;
  33         struct sk_buff *skb;
  34         struct w1_netlink_msg *data;
  35         struct nlmsghdr *nlh;
  36
  37         if (!dev->nls)
  38                 return;
  39
  40         size = NLMSG_SPACE(sizeof(struct w1_netlink_msg));
  41
  42         skb = alloc_skb(size, GFP_ATOMIC);
  43         if (!skb) {
  44                 dev_err(&dev->dev, "skb_alloc() failed.\n");
  45                 return;
  46         }
  47
  48         nlh = NLMSG_PUT(skb, 0, dev->seq++, NLMSG_DONE, size - sizeof(*nlh));
  49
  50         data = (struct w1_netlink_msg *)NLMSG_DATA(nlh);
  51
  52         memcpy(data, msg, sizeof(struct w1_netlink_msg));
  53
  54         NETLINK_CB(skb).dst_group = dev->groups;
  55         netlink_broadcast(dev->nls, skb, 0, dev->groups, GFP_ATOMIC);
  56
  57 nlmsg_failure:
  58         return;
  59 }
  60
  61 int dev_init_netlink(struct w1_master *dev)
  62 {
  63         dev->nls = netlink_kernel_create(NETLINK_W1, 1, NULL, THIS_MODULE);
  64         if (!dev->nls) {
  65                 printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n",
  66                         NETLINK_W1, dev->dev.bus_id);
  67         }
  68
  69         return 0;
  70 }
  71
  72 void dev_fini_netlink(struct w1_master *dev)
  73 {
  74         if (dev->nls && dev->nls->sk_socket)
  75                 sock_release(dev->nls->sk_socket);
  76 }
  77 #else
  78 #warning Netlink support is disabled. Please compile with NET support enabled.
  79
  80 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
  81 {
  82 }
  83
  84 int dev_init_netlink(struct w1_master *dev)
  85 {
  86         return 0;
  87 }
  88
  89 void dev_fini_netlink(struct w1_master *dev)
  90 {
  91 }
  92 #endif