fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / w1 / w1_netlink.c
blob65c5ebd0787e0ea4840ab73db3af612443d3d7b2
1 /*
2 * w1_netlink.c
4 * Copyright (c) 2003 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/skbuff.h>
23 #include <linux/netlink.h>
24 #include <linux/connector.h>
26 #include "w1.h"
27 #include "w1_log.h"
28 #include "w1_netlink.h"
30 #if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
31 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
33 char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
34 struct cn_msg *m = (struct cn_msg *)buf;
35 struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);
37 memset(buf, 0, sizeof(buf));
39 m->id.idx = CN_W1_IDX;
40 m->id.val = CN_W1_VAL;
42 m->seq = dev->seq++;
43 m->len = sizeof(struct w1_netlink_msg);
45 memcpy(w, msg, sizeof(struct w1_netlink_msg));
47 cn_netlink_send(m, 0, GFP_KERNEL);
50 static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg,
51 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
53 dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",
54 __func__, dev->name, cmd->cmd, cmd->len);
56 if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)
57 return -EINVAL;
59 w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
60 return 0;
63 static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
64 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
66 void *data;
67 struct w1_netlink_msg *h;
68 struct w1_netlink_cmd *c;
69 struct cn_msg *cm;
70 int err;
72 data = kzalloc(sizeof(struct cn_msg) +
73 sizeof(struct w1_netlink_msg) +
74 sizeof(struct w1_netlink_cmd) +
75 cmd->len, GFP_KERNEL);
76 if (!data)
77 return -ENOMEM;
79 cm = (struct cn_msg *)(data);
80 h = (struct w1_netlink_msg *)(cm + 1);
81 c = (struct w1_netlink_cmd *)(h + 1);
83 memcpy(cm, msg, sizeof(struct cn_msg));
84 memcpy(h, hdr, sizeof(struct w1_netlink_msg));
85 memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
87 cm->ack = msg->seq+1;
88 cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
90 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
92 memcpy(c->data, cmd->data, c->len);
94 err = cn_netlink_send(cm, 0, GFP_KERNEL);
96 kfree(data);
98 return err;
101 static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
102 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
104 int err = 0;
106 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
107 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc,
108 cmd->cmd, cmd->len);
110 switch (cmd->cmd) {
111 case W1_CMD_READ:
112 w1_read_block(sl->master, cmd->data, cmd->len);
113 w1_send_read_reply(sl, msg, hdr, cmd);
114 break;
115 case W1_CMD_WRITE:
116 w1_write_block(sl->master, cmd->data, cmd->len);
117 break;
118 case W1_CMD_SEARCH:
119 case W1_CMD_ALARM_SEARCH:
120 w1_search_process(sl->master,
121 (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
122 break;
123 default:
124 err = -1;
125 break;
128 return err;
131 static void w1_cn_callback(void *data)
133 struct cn_msg *msg = data;
134 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
135 struct w1_netlink_cmd *cmd;
136 struct w1_slave *sl;
137 struct w1_master *dev;
138 int err = 0;
140 while (msg->len && !err) {
141 struct w1_reg_num id;
142 u16 mlen = m->len;
143 u8 *cmd_data = m->data;
145 dev = NULL;
146 sl = NULL;
148 memcpy(&id, m->id.id, sizeof(id));
149 #if 0
150 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
151 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
152 #endif
153 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
154 err = -E2BIG;
155 break;
158 if (!mlen)
159 goto out_cont;
161 if (m->type == W1_MASTER_CMD) {
162 dev = w1_search_master_id(m->id.mst.id);
163 } else if (m->type == W1_SLAVE_CMD) {
164 sl = w1_search_slave(&id);
165 if (sl)
166 dev = sl->master;
169 if (!dev) {
170 err = -ENODEV;
171 goto out_cont;
174 mutex_lock(&dev->mutex);
176 if (sl && w1_reset_select_slave(sl)) {
177 err = -ENODEV;
178 goto out_up;
181 while (mlen) {
182 cmd = (struct w1_netlink_cmd *)cmd_data;
184 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
185 err = -E2BIG;
186 break;
189 if (sl)
190 w1_process_command_slave(sl, msg, m, cmd);
191 else
192 w1_process_command_master(dev, msg, m, cmd);
194 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
195 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
197 out_up:
198 atomic_dec(&dev->refcnt);
199 if (sl)
200 atomic_dec(&sl->refcnt);
201 mutex_unlock(&dev->mutex);
202 out_cont:
203 msg->len -= sizeof(struct w1_netlink_msg) + m->len;
204 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
207 * Let's allow requests for nonexisting devices.
209 if (err == -ENODEV)
210 err = 0;
212 #if 0
213 if (err) {
214 printk("%s: malformed message. Dropping.\n", __func__);
216 #endif
219 int w1_init_netlink(void)
221 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
223 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
226 void w1_fini_netlink(void)
228 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
230 cn_del_callback(&w1_id);
232 #else
233 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
237 int w1_init_netlink(void)
239 return 0;
242 void w1_fini_netlink(void)
245 #endif