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>
28 static u32 w1_ids = 1;
30 extern struct device_driver w1_driver;
31 extern struct bus_type w1_bus_type;
32 extern struct device w1_device;
33 extern struct device_attribute w1_master_attribute;
34 extern int w1_max_slave_count;
35 extern struct list_head w1_masters;
36 extern spinlock_t w1_mlock;
38 extern int w1_process(void *);
40 struct w1_master * w1_alloc_dev(u32 id, int slave_count,
41 struct device_driver *driver, struct device *device)
43 struct w1_master *dev;
47 * We are in process context(kernel thread), so can sleep.
49 dev = kmalloc(sizeof(struct w1_master) + sizeof(struct w1_bus_master), GFP_KERNEL);
52 "Failed to allocate %d bytes for new w1 device.\n",
53 sizeof(struct w1_master));
57 memset(dev, 0, sizeof(struct w1_master) + sizeof(struct w1_bus_master));
59 dev->bus_master = (struct w1_bus_master *)(dev + 1);
61 dev->owner = THIS_MODULE;
62 dev->max_slave_count = slave_count;
69 atomic_set(&dev->refcnt, 2);
71 INIT_LIST_HEAD(&dev->slist);
72 init_MUTEX(&dev->mutex);
74 init_waitqueue_head(&dev->kwait);
75 init_completion(&dev->dev_released);
76 init_completion(&dev->dev_exited);
78 memcpy(&dev->dev, device, sizeof(struct device));
79 snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
80 "w1_bus_master%u", dev->id);
81 snprintf(dev->name, sizeof(dev->name), "w1_bus_master%u", dev->id);
87 dev->nls = netlink_kernel_create(NETLINK_NFLOG, NULL);
89 printk(KERN_ERR "Failed to create new netlink socket(%u).\n",
91 memset(dev, 0, sizeof(struct w1_master));
96 err = device_register(&dev->dev);
98 printk(KERN_ERR "Failed to register master device. err=%d\n", err);
99 if (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->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;
123 dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, &w1_driver, &w1_device);
127 dev->kpid = kernel_thread(&w1_process, dev, 0);
130 "Failed to create new kernel thread. err=%d\n",
133 goto err_out_free_dev;
136 retval = device_create_file(&dev->dev, &w1_master_attribute);
138 goto err_out_kill_thread;
140 memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));
142 dev->initialized = 1;
144 spin_lock(&w1_mlock);
145 list_add(&dev->w1_master_entry, &w1_masters);
146 spin_unlock(&w1_mlock);
152 if (kill_proc(dev->kpid, SIGTERM, 1))
154 "Failed to send signal to w1 kernel thread %d.\n",
156 wait_for_completion(&dev->dev_exited);
164 void __w1_remove_master_device(struct w1_master *dev)
169 err = kill_proc(dev->kpid, SIGTERM, 1);
172 "%s: Failed to send signal to w1 kernel thread %d.\n",
173 __func__, dev->kpid);
175 while (atomic_read(&dev->refcnt))
176 schedule_timeout(10);
181 void w1_remove_master_device(struct w1_bus_master *bm)
183 struct w1_master *dev = NULL;
184 struct list_head *ent, *n;
186 list_for_each_safe(ent, n, &w1_masters) {
187 dev = list_entry(ent, struct w1_master, w1_master_entry);
188 if (!dev->initialized)
191 if (dev->bus_master->data == bm->data)
196 printk(KERN_ERR "Device doesn't exist.\n");
200 __w1_remove_master_device(dev);
203 EXPORT_SYMBOL(w1_alloc_dev);
204 EXPORT_SYMBOL(w1_free_dev);
205 EXPORT_SYMBOL(w1_add_master_device);
206 EXPORT_SYMBOL(w1_remove_master_device);
207 EXPORT_SYMBOL(__w1_remove_master_device);