]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/w1/w1_netlink.c
w1: add 1-wire master driver for i.MX27 / i.MX31
[mirror_ubuntu-bionic-kernel.git] / drivers / w1 / w1_netlink.c
CommitLineData
1da177e4
LT
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>
12003375 24#include <linux/connector.h>
1da177e4
LT
25
26#include "w1.h"
27#include "w1_log.h"
28#include "w1_netlink.h"
29
46e07f6e 30#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
1da177e4
LT
31void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
32{
12003375
EP
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);
1da177e4 36
12003375 37 memset(buf, 0, sizeof(buf));
1da177e4 38
12003375
EP
39 m->id.idx = CN_W1_IDX;
40 m->id.val = CN_W1_VAL;
1da177e4 41
12003375
EP
42 m->seq = dev->seq++;
43 m->len = sizeof(struct w1_netlink_msg);
1da177e4 44
12003375 45 memcpy(w, msg, sizeof(struct w1_netlink_msg));
1da177e4 46
12003375
EP
47 cn_netlink_send(m, 0, GFP_KERNEL);
48}
1da177e4 49
12003375
EP
50static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg,
51 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
52{
53 dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",
54 __func__, dev->name, cmd->cmd, cmd->len);
1da177e4 55
12003375
EP
56 if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)
57 return -EINVAL;
1da177e4 58
12003375
EP
59 w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);
60 return 0;
1da177e4 61}
2d833179 62
12003375
EP
63static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,
64 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
2d833179 65{
12003375
EP
66 void *data;
67 struct w1_netlink_msg *h;
68 struct w1_netlink_cmd *c;
69 struct cn_msg *cm;
70 int err;
71
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;
78
79 cm = (struct cn_msg *)(data);
80 h = (struct w1_netlink_msg *)(cm + 1);
81 c = (struct w1_netlink_cmd *)(h + 1);
82
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));
86
87 cm->ack = msg->seq+1;
88 cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;
89
90 h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
91
92 memcpy(c->data, cmd->data, c->len);
93
94 err = cn_netlink_send(cm, 0, GFP_KERNEL);
95
96 kfree(data);
97
98 return err;
99}
100
101static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
102 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
103{
104 int err = 0;
105
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);
109
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;
2d833179
EP
126 }
127
12003375
EP
128 return err;
129}
130
131static void w1_cn_callback(void *data)
132{
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;
139
140 while (msg->len && !err) {
141 struct w1_reg_num id;
142 u16 mlen = m->len;
143 u8 *cmd_data = m->data;
144
145 dev = NULL;
146 sl = NULL;
147
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;
156 }
157
158 if (!mlen)
159 goto out_cont;
160
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;
167 }
168
169 if (!dev) {
170 err = -ENODEV;
171 goto out_cont;
172 }
173
abd52a13 174 mutex_lock(&dev->mutex);
12003375
EP
175
176 if (sl && w1_reset_select_slave(sl)) {
177 err = -ENODEV;
178 goto out_up;
179 }
180
181 while (mlen) {
182 cmd = (struct w1_netlink_cmd *)cmd_data;
183
184 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
185 err = -E2BIG;
186 break;
187 }
188
189 if (sl)
190 w1_process_command_slave(sl, msg, m, cmd);
191 else
192 w1_process_command_master(dev, msg, m, cmd);
193
194 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
195 mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
196 }
197out_up:
198 atomic_dec(&dev->refcnt);
199 if (sl)
200 atomic_dec(&sl->refcnt);
abd52a13 201 mutex_unlock(&dev->mutex);
12003375
EP
202out_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);
205
206 /*
207 * Let's allow requests for nonexisting devices.
208 */
209 if (err == -ENODEV)
210 err = 0;
211 }
212#if 0
213 if (err) {
214 printk("%s: malformed message. Dropping.\n", __func__);
215 }
216#endif
2d833179
EP
217}
218
12003375 219int w1_init_netlink(void)
2d833179 220{
12003375
EP
221 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
222
223 return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
224}
225
226void w1_fini_netlink(void)
227{
228 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
229
230 cn_del_callback(&w1_id);
2d833179 231}
1da177e4 232#else
1da177e4
LT
233void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
234{
235}
2d833179 236
12003375 237int w1_init_netlink(void)
2d833179
EP
238{
239 return 0;
240}
241
12003375 242void w1_fini_netlink(void)
2d833179
EP
243{
244}
1da177e4 245#endif