4 * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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.
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.
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
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/delay.h>
28 #include "w1_netlink.h"
30 static u32 w1_ids = 1;
32 extern struct device_driver w1_driver;
33 extern struct bus_type w1_bus_type;
34 extern struct device w1_device;
35 extern int w1_max_slave_count;
36 extern int w1_max_slave_ttl;
37 extern struct list_head w1_masters;
38 extern spinlock_t w1_mlock;
40 extern int w1_process(void *);
42 struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
43 struct device_driver *driver, struct device *device)
45 struct w1_master *dev;
49 * We are in process context(kernel thread), so can sleep.
51 dev = kmalloc(sizeof(struct w1_master) + sizeof(struct w1_bus_master), GFP_KERNEL);
54 "Failed to allocate %zd bytes for new w1 device.\n",
55 sizeof(struct w1_master));
59 memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
61 dev->bus_master = (struct w1_bus_master *)(dev + 1);
63 dev->owner = THIS_MODULE;
64 dev->max_slave_count = slave_count;
70 dev->slave_ttl = slave_ttl;
72 atomic_set(&dev->refcnt, 2);
74 INIT_LIST_HEAD(&dev->slist);
75 init_MUTEX(&dev->mutex);
77 init_waitqueue_head(&dev->kwait);
78 init_completion(&dev->dev_released);
79 init_completion(&dev->dev_exited);
81 memcpy(&dev->dev, device, sizeof(struct device));
82 snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
83 "w1_bus_master%u", dev->id);
84 snprintf(dev->name, sizeof(dev->name), "w1_bus_master%u", dev->id);
90 dev->nls = netlink_kernel_create(NETLINK_NFLOG, NULL);
92 printk(KERN_ERR "Failed to create new netlink socket(%u) for w1 master %s.\n",
93 NETLINK_NFLOG, dev->dev.bus_id);
96 err = device_register(&dev->dev);
98 printk(KERN_ERR "Failed to register master device. err=%d\n", err);
99 if (dev->nls && dev->nls->sk_socket)
100 sock_release(dev->nls->sk_socket);
101 memset(dev, 0, sizeof(struct w1_master));
109 void w1_free_dev(struct w1_master *dev)
111 device_unregister(&dev->dev);
112 if (dev->nls && dev->nls->sk_socket)
113 sock_release(dev->nls->sk_socket);
114 memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
118 int w1_add_master_device(struct w1_bus_master *master)
120 struct w1_master *dev;
122 struct w1_netlink_msg msg;
124 dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_driver, &w1_device);
128 dev->kpid = kernel_thread(&w1_process, dev, 0);
131 "Failed to create new kernel thread. err=%d\n",
134 goto err_out_free_dev;
137 retval = w1_create_master_attributes(dev);
139 goto err_out_kill_thread;
141 memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));
143 dev->initialized = 1;
145 spin_lock(&w1_mlock);
146 list_add(&dev->w1_master_entry, &w1_masters);
147 spin_unlock(&w1_mlock);
149 msg.id.mst.id = dev->id;
150 msg.id.mst.pid = dev->kpid;
151 msg.type = W1_MASTER_ADD;
152 w1_netlink_send(dev, &msg);
158 if (kill_proc(dev->kpid, SIGTERM, 1))
160 "Failed to send signal to w1 kernel thread %d.\n",
162 wait_for_completion(&dev->dev_exited);
170 void __w1_remove_master_device(struct w1_master *dev)
173 struct w1_netlink_msg msg;
176 err = kill_proc(dev->kpid, SIGTERM, 1);
179 "%s: Failed to send signal to w1 kernel thread %d.\n",
180 __func__, dev->kpid);
182 while (atomic_read(&dev->refcnt)) {
183 printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
184 dev->name, atomic_read(&dev->refcnt));
186 if (msleep_interruptible(1000))
187 flush_signals(current);
190 msg.id.mst.id = dev->id;
191 msg.id.mst.pid = dev->kpid;
192 msg.type = W1_MASTER_REMOVE;
193 w1_netlink_send(dev, &msg);
198 void w1_remove_master_device(struct w1_bus_master *bm)
200 struct w1_master *dev = NULL;
201 struct list_head *ent, *n;
203 list_for_each_safe(ent, n, &w1_masters) {
204 dev = list_entry(ent, struct w1_master, w1_master_entry);
205 if (!dev->initialized)
208 if (dev->bus_master->data == bm->data)
213 printk(KERN_ERR "Device doesn't exist.\n");
217 __w1_remove_master_device(dev);
220 EXPORT_SYMBOL(w1_alloc_dev);
221 EXPORT_SYMBOL(w1_free_dev);
222 EXPORT_SYMBOL(w1_add_master_device);
223 EXPORT_SYMBOL(w1_remove_master_device);
224 EXPORT_SYMBOL(__w1_remove_master_device);