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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / w1 / w1_netlink.c
blob40788c925d1c9b4d847e6572f5a8510ac402ac71
1 /*
2 * w1_netlink.c
3 *
4 * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
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 /* update kernel slave list */
59 w1_slave_found(dev, rn);
60
61 avail = dev->priv_size - cmd->len;
62
63 if (avail > 8) {
64 u64 *data = (void *)(cmd + 1) + cmd->len;
65
66 *data = rn;
67 cmd->len += 8;
68 hdr->len += 8;
69 msg->len += 8;
70 return;
71 }
72
73 msg->ack++;
74 cn_netlink_send(msg, 0, GFP_KERNEL);
75
76 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
77 hdr->len = sizeof(struct w1_netlink_cmd);
78 cmd->len = 0;
79 }
80
81 static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
82 unsigned int avail)
83 {
84 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
85 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
86 int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
87
88 dev->priv = msg;
89 dev->priv_size = avail;
90
91 w1_search_process_cb(dev, search_type, w1_send_slave);
92
93 msg->ack = 0;
94 cn_netlink_send(msg, 0, GFP_KERNEL);
95
96 dev->priv = NULL;
97 dev->priv_size = 0;
98
99 return 0;
100 }
101
102 static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
103 struct w1_netlink_cmd *cmd)
104 {
105 void *data;
106 struct w1_netlink_msg *h;
107 struct w1_netlink_cmd *c;
108 struct cn_msg *cm;
109 int err;
110
111 data = kzalloc(sizeof(struct cn_msg) +
112 sizeof(struct w1_netlink_msg) +
113 sizeof(struct w1_netlink_cmd) +
114 cmd->len, GFP_KERNEL);
115 if (!data)
116 return -ENOMEM;
117
118 cm = (struct cn_msg *)(data);
119 h = (struct w1_netlink_msg *)(cm + 1);
120 c = (struct w1_netlink_cmd *)(h + 1);
121
122 memcpy(cm, msg, sizeof(struct cn_msg));
123 memcpy(h, hdr, sizeof(struct w1_netlink_msg));
124 memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
125
126 cm->ack = msg->seq+1;
127 cm->len = sizeof(struct w1_netlink_msg) +
128 sizeof(struct w1_netlink_cmd) + cmd->len;
129
130 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
131
132 memcpy(c->data, cmd->data, c->len);
133
134 err = cn_netlink_send(cm, 0, GFP_KERNEL);
135
136 kfree(data);
137
138 return err;
139 }
140
141 static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
142 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
143 {
144 int err = 0;
145
146 switch (cmd->cmd) {
147 case W1_CMD_TOUCH:
148 w1_touch_block(dev, cmd->data, cmd->len);
149 w1_send_read_reply(msg, hdr, cmd);
150 break;
151 case W1_CMD_READ:
152 w1_read_block(dev, cmd->data, cmd->len);
153 w1_send_read_reply(msg, hdr, cmd);
154 break;
155 case W1_CMD_WRITE:
156 w1_write_block(dev, cmd->data, cmd->len);
157 break;
158 default:
159 err = -EINVAL;
160 break;
161 }
162
163 return err;
164 }
165
166 static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
167 struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
168 {
169 int err = -EINVAL;
170 struct cn_msg *msg;
171 struct w1_netlink_msg *hdr;
172 struct w1_netlink_cmd *cmd;
173
174 msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
175 if (!msg)
176 return -ENOMEM;
177
178 msg->id = req_msg->id;
179 msg->seq = req_msg->seq;
180 msg->ack = 0;
181 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
182
183 hdr = (struct w1_netlink_msg *)(msg + 1);
184 cmd = (struct w1_netlink_cmd *)(hdr + 1);
185
186 hdr->type = W1_MASTER_CMD;
187 hdr->id = req_hdr->id;
188 hdr->len = sizeof(struct w1_netlink_cmd);
189
190 cmd->cmd = req_cmd->cmd;
191 cmd->len = 0;
192
193 switch (cmd->cmd) {
194 case W1_CMD_SEARCH:
195 case W1_CMD_ALARM_SEARCH:
196 err = w1_process_search_command(dev, msg,
197 PAGE_SIZE - msg->len - sizeof(struct cn_msg));
198 break;
199 case W1_CMD_READ:
200 case W1_CMD_WRITE:
201 case W1_CMD_TOUCH:
202 err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
203 break;
204 case W1_CMD_RESET:
205 err = w1_reset_bus(dev);
206 break;
207 default:
208 err = -EINVAL;
209 break;
210 }
211
212 kfree(msg);
213 return err;
214 }
215
216 static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
217 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
218 {
219 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
220 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
221 sl->reg_num.crc, cmd->cmd, cmd->len);
222
223 return w1_process_command_io(sl->master, msg, hdr, cmd);
224 }
225
226 static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
227 {
228 struct w1_master *m;
229 struct cn_msg *cn;
230 struct w1_netlink_msg *w;
231 u32 *id;
232
233 if (mcmd->type != W1_LIST_MASTERS) {
234 printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
235 __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
236 return -EPROTO;
237 }
238
239 cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
240 if (!cn)
241 return -ENOMEM;
242
243 cn->id.idx = CN_W1_IDX;
244 cn->id.val = CN_W1_VAL;
245
246 cn->seq = msg->seq;
247 cn->ack = 1;
248 cn->len = sizeof(struct w1_netlink_msg);
249 w = (struct w1_netlink_msg *)(cn + 1);
250
251 w->type = W1_LIST_MASTERS;
252 w->status = 0;
253 w->len = 0;
254 id = (u32 *)(w + 1);
255
256 mutex_lock(&w1_mlock);
257 list_for_each_entry(m, &w1_masters, w1_master_entry) {
258 if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
259 cn_netlink_send(cn, 0, GFP_KERNEL);
260 cn->ack++;
261 cn->len = sizeof(struct w1_netlink_msg);
262 w->len = 0;
263 id = (u32 *)(w + 1);
264 }
265
266 *id = m->id;
267 w->len += sizeof(*id);
268 cn->len += sizeof(*id);
269 id++;
270 }
271 cn->ack = 0;
272 cn_netlink_send(cn, 0, GFP_KERNEL);
273 mutex_unlock(&w1_mlock);
274
275 kfree(cn);
276 return 0;
277 }
278
279 static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
280 struct w1_netlink_cmd *rcmd, int error)
281 {
282 struct cn_msg *cmsg;
283 struct w1_netlink_msg *msg;
284 struct w1_netlink_cmd *cmd;
285
286 cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
287 if (!cmsg)
288 return -ENOMEM;
289
290 msg = (struct w1_netlink_msg *)(cmsg + 1);
291 cmd = (struct w1_netlink_cmd *)(msg + 1);
292
293 memcpy(cmsg, rcmsg, sizeof(*cmsg));
294 cmsg->len = sizeof(*msg);
295
296 memcpy(msg, rmsg, sizeof(*msg));
297 msg->len = 0;
298 msg->status = (short)-error;
299
300 if (rcmd) {
301 memcpy(cmd, rcmd, sizeof(*cmd));
302 cmd->len = 0;
303 msg->len += sizeof(*cmd);
304 cmsg->len += sizeof(*cmd);
305 }
306
307 error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
308 kfree(cmsg);
309
310 return error;
311 }
312
313 static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
314 {
315 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
316 struct w1_netlink_cmd *cmd;
317 struct w1_slave *sl;
318 struct w1_master *dev;
319 int err = 0;
320
321 while (msg->len && !err) {
322 struct w1_reg_num id;
323 u16 mlen = m->len;
324 u8 *cmd_data = m->data;
325
326 dev = NULL;
327 sl = NULL;
328 cmd = NULL;
329
330 memcpy(&id, m->id.id, sizeof(id));
331 #if 0
332 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
333 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
334 #endif
335 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
336 err = -E2BIG;
337 break;
338 }
339
340 if (m->type == W1_MASTER_CMD) {
341 dev = w1_search_master_id(m->id.mst.id);
342 } else if (m->type == W1_SLAVE_CMD) {
343 sl = w1_search_slave(&id);
344 if (sl)
345 dev = sl->master;
346 } else {
347 err = w1_process_command_root(msg, m);
348 goto out_cont;
349 }
350
351 if (!dev) {
352 err = -ENODEV;
353 goto out_cont;
354 }
355
356 err = 0;
357 if (!mlen)
358 goto out_cont;
359
360 mutex_lock(&dev->mutex);
361
362 if (sl && w1_reset_select_slave(sl)) {
363 err = -ENODEV;
364 goto out_up;
365 }
366
367 while (mlen) {
368 cmd = (struct w1_netlink_cmd *)cmd_data;
369
370 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
371 err = -E2BIG;
372 break;
373 }
374
375 if (sl)
376 err = w1_process_command_slave(sl, msg, m, cmd);
377 else
378 err = w1_process_command_master(dev, msg, m, cmd);
379
380 w1_netlink_send_error(msg, m, cmd, err);
381 err = 0;
382
383 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
384 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
385 }
386 out_up:
387 atomic_dec(&dev->refcnt);
388 if (sl)
389 atomic_dec(&sl->refcnt);
390 mutex_unlock(&dev->mutex);
391 out_cont:
392 if (!cmd || err)
393 w1_netlink_send_error(msg, m, cmd, err);
394 msg->len -= sizeof(struct w1_netlink_msg) + m->len;
395 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
396
397 /*
398 * Let's allow requests for nonexisting devices.
399 */
400 if (err == -ENODEV)
401 err = 0;
402 }
403 }
404
405 int w1_init_netlink(void)
406 {
407 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
408
409 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
410 }
411
412 void w1_fini_netlink(void)
413 {
414 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
415
416 cn_del_callback(&w1_id);
417 }
418 #else
419 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
420 {
421 }
422
423 int w1_init_netlink(void)
424 {
425 return 0;
426 }
427
428 void w1_fini_netlink(void)
429 {
430 }
431 #endif
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