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>
25 #include <linux/kthread.h>
29 #include "w1_netlink.h"
32 static u32 w1_ids
= 1;
34 static struct w1_master
* w1_alloc_dev(u32 id
, int slave_count
, int slave_ttl
,
35 struct device_driver
*driver
,
36 struct device
*device
)
38 struct w1_master
*dev
;
42 * We are in process context(kernel thread), so can sleep.
44 dev
= kzalloc(sizeof(struct w1_master
) + sizeof(struct w1_bus_master
), GFP_KERNEL
);
47 "Failed to allocate %zd bytes for new w1 device.\n",
48 sizeof(struct w1_master
));
53 dev
->bus_master
= (struct w1_bus_master
*)(dev
+ 1);
55 dev
->owner
= THIS_MODULE
;
56 dev
->max_slave_count
= slave_count
;
61 dev
->slave_ttl
= slave_ttl
;
62 dev
->search_count
= -1; /* continual scan */
64 atomic_set(&dev
->refcnt
, 2);
66 INIT_LIST_HEAD(&dev
->slist
);
67 mutex_init(&dev
->mutex
);
69 memcpy(&dev
->dev
, device
, sizeof(struct device
));
70 snprintf(dev
->dev
.bus_id
, sizeof(dev
->dev
.bus_id
),
71 "w1_bus_master%u", dev
->id
);
72 snprintf(dev
->name
, sizeof(dev
->name
), "w1_bus_master%u", dev
->id
);
78 err
= device_register(&dev
->dev
);
80 printk(KERN_ERR
"Failed to register master device. err=%d\n", err
);
81 memset(dev
, 0, sizeof(struct w1_master
));
89 static void w1_free_dev(struct w1_master
*dev
)
91 device_unregister(&dev
->dev
);
94 int w1_add_master_device(struct w1_bus_master
*master
)
96 struct w1_master
*dev
;
98 struct w1_netlink_msg msg
;
100 /* validate minimum functionality */
101 if (!(master
->touch_bit
&& master
->reset_bus
) &&
102 !(master
->write_bit
&& master
->read_bit
) &&
103 !(master
->write_byte
&& master
->read_byte
&& master
->reset_bus
)) {
104 printk(KERN_ERR
"w1_add_master_device: invalid function set\n");
108 dev
= w1_alloc_dev(w1_ids
++, w1_max_slave_count
, w1_max_slave_ttl
, &w1_master_driver
, &w1_master_device
);
112 dev
->thread
= kthread_run(&w1_process
, dev
, "%s", dev
->name
);
113 if (IS_ERR(dev
->thread
)) {
114 retval
= PTR_ERR(dev
->thread
);
116 "Failed to create new kernel thread. err=%d\n",
118 goto err_out_free_dev
;
121 retval
= w1_create_master_attributes(dev
);
123 goto err_out_kill_thread
;
125 memcpy(dev
->bus_master
, master
, sizeof(struct w1_bus_master
));
127 dev
->initialized
= 1;
129 mutex_lock(&w1_mlock
);
130 list_add(&dev
->w1_master_entry
, &w1_masters
);
131 mutex_unlock(&w1_mlock
);
133 memset(&msg
, 0, sizeof(msg
));
134 msg
.id
.mst
.id
= dev
->id
;
135 msg
.type
= W1_MASTER_ADD
;
136 w1_netlink_send(dev
, &msg
);
141 kthread_stop(dev
->thread
);
148 void __w1_remove_master_device(struct w1_master
*dev
)
150 struct w1_netlink_msg msg
;
152 set_bit(W1_MASTER_NEED_EXIT
, &dev
->flags
);
153 kthread_stop(dev
->thread
);
155 while (atomic_read(&dev
->refcnt
)) {
156 dev_info(&dev
->dev
, "Waiting for %s to become free: refcnt=%d.\n",
157 dev
->name
, atomic_read(&dev
->refcnt
));
159 if (msleep_interruptible(1000))
160 flush_signals(current
);
163 memset(&msg
, 0, sizeof(msg
));
164 msg
.id
.mst
.id
= dev
->id
;
165 msg
.type
= W1_MASTER_REMOVE
;
166 w1_netlink_send(dev
, &msg
);
171 void w1_remove_master_device(struct w1_bus_master
*bm
)
173 struct w1_master
*dev
, *found
= NULL
;
175 list_for_each_entry(dev
, &w1_masters
, w1_master_entry
) {
176 if (!dev
->initialized
)
179 if (dev
->bus_master
->data
== bm
->data
) {
186 printk(KERN_ERR
"Device doesn't exist.\n");
190 __w1_remove_master_device(found
);
193 EXPORT_SYMBOL(w1_add_master_device
);
194 EXPORT_SYMBOL(w1_remove_master_device
);
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