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Linux 2.6.36-rc5
[linux-2.6/next.git] / drivers / w1 / w1_netlink.c
blob7e667bc77ef2d02649fbe32cd69b4ab94e06e9f6
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/slab.h>
23 #include <linux/skbuff.h>
24 #include <linux/netlink.h>
25 #include <linux/connector.h>
26
27 #include "w1.h"
28 #include "w1_log.h"
29 #include "w1_netlink.h"
30
31 #if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
32 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
33 {
34 char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
35 struct cn_msg *m = (struct cn_msg *)buf;
36 struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);
37
38 memset(buf, 0, sizeof(buf));
39
40 m->id.idx = CN_W1_IDX;
41 m->id.val = CN_W1_VAL;
42
43 m->seq = dev->seq++;
44 m->len = sizeof(struct w1_netlink_msg);
45
46 memcpy(w, msg, sizeof(struct w1_netlink_msg));
47
48 cn_netlink_send(m, 0, GFP_KERNEL);
49 }
50
51 static void w1_send_slave(struct w1_master *dev, u64 rn)
52 {
53 struct cn_msg *msg = dev->priv;
54 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
55 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
56 int avail;
57
58 avail = dev->priv_size - cmd->len;
59
60 if (avail > 8) {
61 u64 *data = (void *)(cmd + 1) + cmd->len;
62
63 *data = rn;
64 cmd->len += 8;
65 hdr->len += 8;
66 msg->len += 8;
67 return;
68 }
69
70 msg->ack++;
71 cn_netlink_send(msg, 0, GFP_KERNEL);
72
73 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
74 hdr->len = sizeof(struct w1_netlink_cmd);
75 cmd->len = 0;
76 }
77
78 static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
79 unsigned int avail)
80 {
81 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
82 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
83 int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
84
85 dev->priv = msg;
86 dev->priv_size = avail;
87
88 w1_search_devices(dev, search_type, w1_send_slave);
89
90 msg->ack = 0;
91 cn_netlink_send(msg, 0, GFP_KERNEL);
92
93 dev->priv = NULL;
94 dev->priv_size = 0;
95
96 return 0;
97 }
98
99 static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
100 struct w1_netlink_cmd *cmd)
101 {
102 void *data;
103 struct w1_netlink_msg *h;
104 struct w1_netlink_cmd *c;
105 struct cn_msg *cm;
106 int err;
107
108 data = kzalloc(sizeof(struct cn_msg) +
109 sizeof(struct w1_netlink_msg) +
110 sizeof(struct w1_netlink_cmd) +
111 cmd->len, GFP_KERNEL);
112 if (!data)
113 return -ENOMEM;
114
115 cm = (struct cn_msg *)(data);
116 h = (struct w1_netlink_msg *)(cm + 1);
117 c = (struct w1_netlink_cmd *)(h + 1);
118
119 memcpy(cm, msg, sizeof(struct cn_msg));
120 memcpy(h, hdr, sizeof(struct w1_netlink_msg));
121 memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
122
123 cm->ack = msg->seq+1;
124 cm->len = sizeof(struct w1_netlink_msg) +
125 sizeof(struct w1_netlink_cmd) + cmd->len;
126
127 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
128
129 memcpy(c->data, cmd->data, c->len);
130
131 err = cn_netlink_send(cm, 0, GFP_KERNEL);
132
133 kfree(data);
134
135 return err;
136 }
137
138 static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
139 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
140 {
141 int err = 0;
142
143 switch (cmd->cmd) {
144 case W1_CMD_TOUCH:
145 w1_touch_block(dev, cmd->data, cmd->len);
146 w1_send_read_reply(msg, hdr, cmd);
147 break;
148 case W1_CMD_READ:
149 w1_read_block(dev, cmd->data, cmd->len);
150 w1_send_read_reply(msg, hdr, cmd);
151 break;
152 case W1_CMD_WRITE:
153 w1_write_block(dev, cmd->data, cmd->len);
154 break;
155 default:
156 err = -EINVAL;
157 break;
158 }
159
160 return err;
161 }
162
163 static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
164 struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
165 {
166 int err = -EINVAL;
167 struct cn_msg *msg;
168 struct w1_netlink_msg *hdr;
169 struct w1_netlink_cmd *cmd;
170
171 msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
172 if (!msg)
173 return -ENOMEM;
174
175 msg->id = req_msg->id;
176 msg->seq = req_msg->seq;
177 msg->ack = 0;
178 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
179
180 hdr = (struct w1_netlink_msg *)(msg + 1);
181 cmd = (struct w1_netlink_cmd *)(hdr + 1);
182
183 hdr->type = W1_MASTER_CMD;
184 hdr->id = req_hdr->id;
185 hdr->len = sizeof(struct w1_netlink_cmd);
186
187 cmd->cmd = req_cmd->cmd;
188 cmd->len = 0;
189
190 switch (cmd->cmd) {
191 case W1_CMD_SEARCH:
192 case W1_CMD_ALARM_SEARCH:
193 err = w1_process_search_command(dev, msg,
194 PAGE_SIZE - msg->len - sizeof(struct cn_msg));
195 break;
196 case W1_CMD_READ:
197 case W1_CMD_WRITE:
198 case W1_CMD_TOUCH:
199 err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
200 break;
201 case W1_CMD_RESET:
202 err = w1_reset_bus(dev);
203 break;
204 default:
205 err = -EINVAL;
206 break;
207 }
208
209 kfree(msg);
210 return err;
211 }
212
213 static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
214 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
215 {
216 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
217 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
218 sl->reg_num.crc, cmd->cmd, cmd->len);
219
220 return w1_process_command_io(sl->master, msg, hdr, cmd);
221 }
222
223 static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
224 {
225 struct w1_master *m;
226 struct cn_msg *cn;
227 struct w1_netlink_msg *w;
228 u32 *id;
229
230 if (mcmd->type != W1_LIST_MASTERS) {
231 printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
232 __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
233 return -EPROTO;
234 }
235
236 cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
237 if (!cn)
238 return -ENOMEM;
239
240 cn->id.idx = CN_W1_IDX;
241 cn->id.val = CN_W1_VAL;
242
243 cn->seq = msg->seq;
244 cn->ack = 1;
245 cn->len = sizeof(struct w1_netlink_msg);
246 w = (struct w1_netlink_msg *)(cn + 1);
247
248 w->type = W1_LIST_MASTERS;
249 w->status = 0;
250 w->len = 0;
251 id = (u32 *)(w + 1);
252
253 mutex_lock(&w1_mlock);
254 list_for_each_entry(m, &w1_masters, w1_master_entry) {
255 if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
256 cn_netlink_send(cn, 0, GFP_KERNEL);
257 cn->ack++;
258 cn->len = sizeof(struct w1_netlink_msg);
259 w->len = 0;
260 id = (u32 *)(w + 1);
261 }
262
263 *id = m->id;
264 w->len += sizeof(*id);
265 cn->len += sizeof(*id);
266 id++;
267 }
268 cn->ack = 0;
269 cn_netlink_send(cn, 0, GFP_KERNEL);
270 mutex_unlock(&w1_mlock);
271
272 kfree(cn);
273 return 0;
274 }
275
276 static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
277 struct w1_netlink_cmd *rcmd, int error)
278 {
279 struct cn_msg *cmsg;
280 struct w1_netlink_msg *msg;
281 struct w1_netlink_cmd *cmd;
282
283 cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
284 if (!cmsg)
285 return -ENOMEM;
286
287 msg = (struct w1_netlink_msg *)(cmsg + 1);
288 cmd = (struct w1_netlink_cmd *)(msg + 1);
289
290 memcpy(cmsg, rcmsg, sizeof(*cmsg));
291 cmsg->len = sizeof(*msg);
292
293 memcpy(msg, rmsg, sizeof(*msg));
294 msg->len = 0;
295 msg->status = (short)-error;
296
297 if (rcmd) {
298 memcpy(cmd, rcmd, sizeof(*cmd));
299 cmd->len = 0;
300 msg->len += sizeof(*cmd);
301 cmsg->len += sizeof(*cmd);
302 }
303
304 error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
305 kfree(cmsg);
306
307 return error;
308 }
309
310 static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
311 {
312 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
313 struct w1_netlink_cmd *cmd;
314 struct w1_slave *sl;
315 struct w1_master *dev;
316 int err = 0;
317
318 while (msg->len && !err) {
319 struct w1_reg_num id;
320 u16 mlen = m->len;
321 u8 *cmd_data = m->data;
322
323 dev = NULL;
324 sl = NULL;
325 cmd = NULL;
326
327 memcpy(&id, m->id.id, sizeof(id));
328 #if 0
329 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
330 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
331 #endif
332 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
333 err = -E2BIG;
334 break;
335 }
336
337 if (m->type == W1_MASTER_CMD) {
338 dev = w1_search_master_id(m->id.mst.id);
339 } else if (m->type == W1_SLAVE_CMD) {
340 sl = w1_search_slave(&id);
341 if (sl)
342 dev = sl->master;
343 } else {
344 err = w1_process_command_root(msg, m);
345 goto out_cont;
346 }
347
348 if (!dev) {
349 err = -ENODEV;
350 goto out_cont;
351 }
352
353 err = 0;
354 if (!mlen)
355 goto out_cont;
356
357 mutex_lock(&dev->mutex);
358
359 if (sl && w1_reset_select_slave(sl)) {
360 err = -ENODEV;
361 goto out_up;
362 }
363
364 while (mlen) {
365 cmd = (struct w1_netlink_cmd *)cmd_data;
366
367 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
368 err = -E2BIG;
369 break;
370 }
371
372 if (sl)
373 err = w1_process_command_slave(sl, msg, m, cmd);
374 else
375 err = w1_process_command_master(dev, msg, m, cmd);
376
377 w1_netlink_send_error(msg, m, cmd, err);
378 err = 0;
379
380 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
381 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
382 }
383 out_up:
384 atomic_dec(&dev->refcnt);
385 if (sl)
386 atomic_dec(&sl->refcnt);
387 mutex_unlock(&dev->mutex);
388 out_cont:
389 if (!cmd || err)
390 w1_netlink_send_error(msg, m, cmd, err);
391 msg->len -= sizeof(struct w1_netlink_msg) + m->len;
392 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
393
394 /*
395 * Let's allow requests for nonexisting devices.
396 */
397 if (err == -ENODEV)
398 err = 0;
399 }
400 }
401
402 int w1_init_netlink(void)
403 {
404 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
405
406 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
407 }
408
409 void w1_fini_netlink(void)
410 {
411 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
412
413 cn_del_callback(&w1_id);
414 }
415 #else
416 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
417 {
418 }
419
420 int w1_init_netlink(void)
421 {
422 return 0;
423 }
424
425 void w1_fini_netlink(void)
426 {
427 }
428 #endif
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