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OMAP3 PM: CPUFreq driver for OMAP3
[linux-ginger.git] / drivers / w1 / w1_netlink.c
blob45c126fea31dcdad608a666964d316214386e1fb
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/skbuff.h>
23 #include <linux/netlink.h>
24 #include <linux/connector.h>
25
26 #include "w1.h"
27 #include "w1_log.h"
28 #include "w1_netlink.h"
29
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)
32 {
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);
36
37 memset(buf, 0, sizeof(buf));
38
39 m->id.idx = CN_W1_IDX;
40 m->id.val = CN_W1_VAL;
41
42 m->seq = dev->seq++;
43 m->len = sizeof(struct w1_netlink_msg);
44
45 memcpy(w, msg, sizeof(struct w1_netlink_msg));
46
47 cn_netlink_send(m, 0, GFP_KERNEL);
48 }
49
50 static void w1_send_slave(struct w1_master *dev, u64 rn)
51 {
52 struct cn_msg *msg = dev->priv;
53 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
54 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
55 int avail;
56
57 avail = dev->priv_size - cmd->len;
58
59 if (avail > 8) {
60 u64 *data = (void *)(cmd + 1) + cmd->len;
61
62 *data = rn;
63 cmd->len += 8;
64 hdr->len += 8;
65 msg->len += 8;
66 return;
67 }
68
69 msg->ack++;
70 cn_netlink_send(msg, 0, GFP_KERNEL);
71
72 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
73 hdr->len = sizeof(struct w1_netlink_cmd);
74 cmd->len = 0;
75 }
76
77 static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
78 unsigned int avail)
79 {
80 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
81 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
82 int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
83
84 dev->priv = msg;
85 dev->priv_size = avail;
86
87 w1_search_devices(dev, search_type, w1_send_slave);
88
89 msg->ack = 0;
90 cn_netlink_send(msg, 0, GFP_KERNEL);
91
92 dev->priv = NULL;
93 dev->priv_size = 0;
94
95 return 0;
96 }
97
98 static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
99 struct w1_netlink_cmd *cmd)
100 {
101 void *data;
102 struct w1_netlink_msg *h;
103 struct w1_netlink_cmd *c;
104 struct cn_msg *cm;
105 int err;
106
107 data = kzalloc(sizeof(struct cn_msg) +
108 sizeof(struct w1_netlink_msg) +
109 sizeof(struct w1_netlink_cmd) +
110 cmd->len, GFP_KERNEL);
111 if (!data)
112 return -ENOMEM;
113
114 cm = (struct cn_msg *)(data);
115 h = (struct w1_netlink_msg *)(cm + 1);
116 c = (struct w1_netlink_cmd *)(h + 1);
117
118 memcpy(cm, msg, sizeof(struct cn_msg));
119 memcpy(h, hdr, sizeof(struct w1_netlink_msg));
120 memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
121
122 cm->ack = msg->seq+1;
123 cm->len = sizeof(struct w1_netlink_msg) +
124 sizeof(struct w1_netlink_cmd) + cmd->len;
125
126 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
127
128 memcpy(c->data, cmd->data, c->len);
129
130 err = cn_netlink_send(cm, 0, GFP_KERNEL);
131
132 kfree(data);
133
134 return err;
135 }
136
137 static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
138 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
139 {
140 int err = 0;
141
142 switch (cmd->cmd) {
143 case W1_CMD_TOUCH:
144 w1_touch_block(dev, cmd->data, cmd->len);
145 w1_send_read_reply(msg, hdr, cmd);
146 break;
147 case W1_CMD_READ:
148 w1_read_block(dev, cmd->data, cmd->len);
149 w1_send_read_reply(msg, hdr, cmd);
150 break;
151 case W1_CMD_WRITE:
152 w1_write_block(dev, cmd->data, cmd->len);
153 break;
154 default:
155 err = -EINVAL;
156 break;
157 }
158
159 return err;
160 }
161
162 static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
163 struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
164 {
165 int err = -EINVAL;
166 struct cn_msg *msg;
167 struct w1_netlink_msg *hdr;
168 struct w1_netlink_cmd *cmd;
169
170 msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
171 if (!msg)
172 return -ENOMEM;
173
174 msg->id = req_msg->id;
175 msg->seq = req_msg->seq;
176 msg->ack = 0;
177 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
178
179 hdr = (struct w1_netlink_msg *)(msg + 1);
180 cmd = (struct w1_netlink_cmd *)(hdr + 1);
181
182 hdr->type = W1_MASTER_CMD;
183 hdr->id = req_hdr->id;
184 hdr->len = sizeof(struct w1_netlink_cmd);
185
186 cmd->cmd = req_cmd->cmd;
187 cmd->len = 0;
188
189 switch (cmd->cmd) {
190 case W1_CMD_SEARCH:
191 case W1_CMD_ALARM_SEARCH:
192 err = w1_process_search_command(dev, msg,
193 PAGE_SIZE - msg->len - sizeof(struct cn_msg));
194 break;
195 case W1_CMD_READ:
196 case W1_CMD_WRITE:
197 case W1_CMD_TOUCH:
198 err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
199 break;
200 case W1_CMD_RESET:
201 err = w1_reset_bus(dev);
202 break;
203 default:
204 err = -EINVAL;
205 break;
206 }
207
208 kfree(msg);
209 return err;
210 }
211
212 static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
213 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
214 {
215 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
216 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
217 sl->reg_num.crc, cmd->cmd, cmd->len);
218
219 return w1_process_command_io(sl->master, msg, hdr, cmd);
220 }
221
222 static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
223 {
224 struct w1_master *m;
225 struct cn_msg *cn;
226 struct w1_netlink_msg *w;
227 u32 *id;
228
229 if (mcmd->type != W1_LIST_MASTERS) {
230 printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
231 __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
232 return -EPROTO;
233 }
234
235 cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
236 if (!cn)
237 return -ENOMEM;
238
239 cn->id.idx = CN_W1_IDX;
240 cn->id.val = CN_W1_VAL;
241
242 cn->seq = msg->seq;
243 cn->ack = 1;
244 cn->len = sizeof(struct w1_netlink_msg);
245 w = (struct w1_netlink_msg *)(cn + 1);
246
247 w->type = W1_LIST_MASTERS;
248 w->status = 0;
249 w->len = 0;
250 id = (u32 *)(w + 1);
251
252 mutex_lock(&w1_mlock);
253 list_for_each_entry(m, &w1_masters, w1_master_entry) {
254 if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
255 cn_netlink_send(cn, 0, GFP_KERNEL);
256 cn->ack++;
257 cn->len = sizeof(struct w1_netlink_msg);
258 w->len = 0;
259 id = (u32 *)(w + 1);
260 }
261
262 *id = m->id;
263 w->len += sizeof(*id);
264 cn->len += sizeof(*id);
265 id++;
266 }
267 cn->ack = 0;
268 cn_netlink_send(cn, 0, GFP_KERNEL);
269 mutex_unlock(&w1_mlock);
270
271 kfree(cn);
272 return 0;
273 }
274
275 static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
276 struct w1_netlink_cmd *rcmd, int error)
277 {
278 struct cn_msg *cmsg;
279 struct w1_netlink_msg *msg;
280 struct w1_netlink_cmd *cmd;
281
282 cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
283 if (!cmsg)
284 return -ENOMEM;
285
286 msg = (struct w1_netlink_msg *)(cmsg + 1);
287 cmd = (struct w1_netlink_cmd *)(msg + 1);
288
289 memcpy(cmsg, rcmsg, sizeof(*cmsg));
290 cmsg->len = sizeof(*msg);
291
292 memcpy(msg, rmsg, sizeof(*msg));
293 msg->len = 0;
294 msg->status = (short)-error;
295
296 if (rcmd) {
297 memcpy(cmd, rcmd, sizeof(*cmd));
298 cmd->len = 0;
299 msg->len += sizeof(*cmd);
300 cmsg->len += sizeof(*cmd);
301 }
302
303 error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
304 kfree(cmsg);
305
306 return error;
307 }
308
309 static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
310 {
311 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
312 struct w1_netlink_cmd *cmd;
313 struct w1_slave *sl;
314 struct w1_master *dev;
315 int err = 0;
316
317 while (msg->len && !err) {
318 struct w1_reg_num id;
319 u16 mlen = m->len;
320 u8 *cmd_data = m->data;
321
322 dev = NULL;
323 sl = NULL;
324 cmd = NULL;
325
326 memcpy(&id, m->id.id, sizeof(id));
327 #if 0
328 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
329 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
330 #endif
331 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
332 err = -E2BIG;
333 break;
334 }
335
336 if (m->type == W1_MASTER_CMD) {
337 dev = w1_search_master_id(m->id.mst.id);
338 } else if (m->type == W1_SLAVE_CMD) {
339 sl = w1_search_slave(&id);
340 if (sl)
341 dev = sl->master;
342 } else {
343 err = w1_process_command_root(msg, m);
344 goto out_cont;
345 }
346
347 if (!dev) {
348 err = -ENODEV;
349 goto out_cont;
350 }
351
352 err = 0;
353 if (!mlen)
354 goto out_cont;
355
356 mutex_lock(&dev->mutex);
357
358 if (sl && w1_reset_select_slave(sl)) {
359 err = -ENODEV;
360 goto out_up;
361 }
362
363 while (mlen) {
364 cmd = (struct w1_netlink_cmd *)cmd_data;
365
366 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
367 err = -E2BIG;
368 break;
369 }
370
371 if (sl)
372 err = w1_process_command_slave(sl, msg, m, cmd);
373 else
374 err = w1_process_command_master(dev, msg, m, cmd);
375
376 w1_netlink_send_error(msg, m, cmd, err);
377 err = 0;
378
379 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
380 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
381 }
382 out_up:
383 atomic_dec(&dev->refcnt);
384 if (sl)
385 atomic_dec(&sl->refcnt);
386 mutex_unlock(&dev->mutex);
387 out_cont:
388 if (!cmd || err)
389 w1_netlink_send_error(msg, m, cmd, err);
390 msg->len -= sizeof(struct w1_netlink_msg) + m->len;
391 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
392
393 /*
394 * Let's allow requests for nonexisting devices.
395 */
396 if (err == -ENODEV)
397 err = 0;
398 }
399 }
400
401 int w1_init_netlink(void)
402 {
403 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
404
405 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
406 }
407
408 void w1_fini_netlink(void)
409 {
410 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
411
412 cn_del_callback(&w1_id);
413 }
414 #else
415 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
416 {
417 }
418
419 int w1_init_netlink(void)
420 {
421 return 0;
422 }
423
424 void w1_fini_netlink(void)
425 {
426 }
427 #endif
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