fix kernel version detection in switch driver
[openwrt.git] / target / linux / package / switch / src / switch-core.c
1 /*
2  * switch-core.c
3  *
4  * Copyright (C) 2005 Felix Fietkau <openwrt@nbd.name>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19  *
20  * $Id: $
21  */
22
23 #include <linux/config.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <asm/uaccess.h>
27 #include <linux/proc_fs.h>
28 #include <linux/list.h>
29
30 #include "switch-core.h"
31
32 static int drv_num = 0;
33 static struct proc_dir_entry *switch_root;
34 switch_driver drivers;
35
36 typedef struct {
37         struct list_head list;
38         struct proc_dir_entry *parent;
39         int nr;
40         switch_config handler;
41 } switch_proc_handler;
42
43 typedef struct {
44         struct proc_dir_entry *driver_dir, *port_dir, *vlan_dir;
45         struct proc_dir_entry **ports, **vlans;
46         switch_proc_handler data;
47         int nr;
48 } switch_priv;
49
50
51 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos);
52 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data);
53
54 static struct file_operations switch_proc_fops = {
55         read: switch_proc_read,
56         write: switch_proc_write
57 };
58
59 static char *strdup(char *str)
60 {
61         char *new = kmalloc(strlen(str) + 1, GFP_KERNEL);
62         strcpy(new, str);
63         return new;
64 }
65
66 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos)
67 {
68 #ifdef LINUX_2_4
69         struct inode *inode = file->f_dentry->d_inode;
70         struct proc_dir_entry *dent = inode->u.generic_ip;
71 #else
72         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
73 #endif
74         char *page;
75         int len = 0;
76         
77         if ((page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL)) == NULL)
78                 return -ENOBUFS;
79         
80         if (dent->data != NULL) {
81                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
82                 if (handler->handler.read != NULL)
83                         len += handler->handler.read(page + len, handler->nr);
84         }
85         len += 1;
86
87         if (*ppos < len) {
88                 len = min_t(int, len - *ppos, count);
89                 if (copy_to_user(buf, (page + *ppos), len)) {
90                         kfree(page);
91                         return -EFAULT;
92                 }
93                 *ppos += len;
94         } else {
95                 len = 0;
96         }
97
98         return len;
99 }
100
101
102 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
103 {
104 #ifdef LINUX_2_4
105         struct inode *inode = file->f_dentry->d_inode;
106         struct proc_dir_entry *dent = inode->u.generic_ip;
107 #else
108         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
109 #endif
110         char *page;
111         int ret = -EINVAL;
112
113         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
114                 return -ENOBUFS;
115
116         if (copy_from_user(page, buf, count)) {
117                 kfree(page);
118                 return -EINVAL;
119         }
120         page[count] = 0;
121         
122         if (dent->data != NULL) {
123                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
124                 if (handler->handler.write != NULL) {
125                         if ((ret = handler->handler.write(page, handler->nr)) >= 0)
126                                 ret = count;
127                 }
128         }
129
130         kfree(page);
131         return ret;
132 }
133
134 static void add_handlers(switch_priv *priv, switch_config *handlers, struct proc_dir_entry *parent, int nr)
135 {
136         switch_proc_handler *tmp;
137         int i, mode;
138         struct proc_dir_entry *p;
139         
140         for (i = 0; handlers[i].name != NULL; i++) {
141                 tmp = kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
142                 INIT_LIST_HEAD(&tmp->list);
143                 tmp->parent = parent;
144                 tmp->nr = nr;
145                 memcpy(&tmp->handler, &(handlers[i]), sizeof(switch_config));
146                 list_add(&tmp->list, &priv->data.list);
147                 
148                 mode = 0;
149                 if (handlers[i].read != NULL) mode |= S_IRUSR;
150                 if (handlers[i].write != NULL) mode |= S_IWUSR;
151                 
152                 if ((p = create_proc_entry(handlers[i].name, mode, parent)) != NULL) {
153                         p->data = (void *) tmp;
154                         p->proc_fops = &switch_proc_fops;
155                 }
156         }
157 }               
158
159 static void remove_handlers(switch_priv *priv)
160 {
161         struct list_head *pos, *q;
162         switch_proc_handler *tmp;
163
164         list_for_each_safe(pos, q, &priv->data.list) {
165                 tmp = list_entry(pos, switch_proc_handler, list);
166                 list_del(pos);
167                 remove_proc_entry(tmp->handler.name, tmp->parent);
168                 kfree(tmp);
169         }
170 }
171
172
173 static void do_unregister(switch_driver *driver)
174 {
175         char buf[4];
176         int i;
177         switch_priv *priv = (switch_priv *) driver->data;
178
179         remove_handlers(priv);
180         
181         for(i = 0; priv->ports[i] != NULL; i++) {
182                 sprintf(buf, "%d", i);
183                 remove_proc_entry(buf, priv->port_dir);
184         }
185         kfree(priv->ports);
186         remove_proc_entry("port", priv->driver_dir);
187
188         for(i = 0; priv->vlans[i] != NULL; i++) {
189                 sprintf(buf, "%d", i);
190                 remove_proc_entry(buf, priv->vlan_dir);
191         }
192         kfree(priv->vlans);
193         remove_proc_entry("vlan", priv->driver_dir);
194
195         remove_proc_entry(driver->name, switch_root);
196                         
197         if (priv->nr == (drv_num - 1))
198                 drv_num--;
199
200         kfree(priv);
201 }
202
203 static int do_register(switch_driver *driver)
204 {
205         switch_priv *priv;
206         int i;
207         char buf[4];
208         
209         if ((priv = kmalloc(sizeof(switch_priv), GFP_KERNEL)) == NULL)
210                 return -ENOBUFS;
211         driver->data = (void *) priv;
212
213         INIT_LIST_HEAD(&priv->data.list);
214         
215         priv->nr = drv_num++;
216         sprintf(buf, "%d", priv->nr);
217         priv->driver_dir = proc_mkdir(buf, switch_root);
218         if (driver->driver_handlers != NULL)
219                 add_handlers(priv, driver->driver_handlers, priv->driver_dir, 0);
220         
221         priv->port_dir = proc_mkdir("port", priv->driver_dir);
222         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
223         for (i = 0; i < driver->ports; i++) {
224                 sprintf(buf, "%d", i);
225                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
226                 if (driver->port_handlers != NULL)
227                         add_handlers(priv, driver->port_handlers, priv->ports[i], i);
228         }
229         priv->ports[i] = NULL;
230         
231         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
232         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
233         for (i = 0; i < driver->vlans; i++) {
234                 sprintf(buf, "%d", i);
235                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
236                 if (driver->vlan_handlers != NULL)
237                         add_handlers(priv, driver->vlan_handlers, priv->vlans[i], i);
238         }
239         priv->vlans[i] = NULL;
240         
241
242         return 0;
243 }
244
245 static int isspace(char c) {
246         switch(c) {
247                 case ' ':
248                 case 0x09:
249                 case 0x0a:
250                 case 0x0d:
251                         return 1;
252                 default:
253                         return 0;
254         }
255 }
256
257 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
258 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
259                                                                                                                  
260 int switch_parse_media(char *buf)
261 {
262         char *str = buf;
263         while (*buf != 0) {
264                 *buf = toupper(*buf);
265                 buf++;
266         }
267
268         if (strncmp(str, "AUTO", 4) == 0)
269                 return SWITCH_MEDIA_AUTO;
270         else if (strncmp(str, "100FD", 5) == 0)
271                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
272         else if (strncmp(str, "100HD", 5) == 0)
273                 return SWITCH_MEDIA_100;
274         else if (strncmp(str, "10FD", 4) == 0)
275                 return SWITCH_MEDIA_FD;
276         else if (strncmp(str, "10HD", 4) == 0)
277                 return 0;
278         else return -1;
279 }
280
281 int switch_print_media(char *buf, int media)
282 {
283         int len = 0;
284
285         if (media & SWITCH_MEDIA_AUTO)
286                 len = sprintf(buf, "Auto");
287         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
288                 len = sprintf(buf, "100FD");
289         else if (media == SWITCH_MEDIA_100)
290                 len = sprintf(buf,  "100HD");
291         else if (media == SWITCH_MEDIA_FD)
292                 len = sprintf(buf,  "10FD");
293         else if (media == 0)
294                 len = sprintf(buf,  "10HD");
295         else
296                 len = sprintf(buf, "Invalid");
297
298         return len;
299 }
300
301 int switch_parse_vlan(char *buf)
302 {
303         char vlan = 0, tag = 0, pvid_port = 0;
304         int untag, j;
305
306         while (isspace(*buf)) buf++;
307         
308         while (*buf >= '0' && *buf <= '9') {
309                 j = *buf++ - '0';
310                 vlan |= 1 << j;
311                 
312                 untag = 0;
313                 /* untag if needed, CPU port requires special handling */
314                 if (*buf == 'u' || (j != 5 && (isspace(*buf) || *buf == 0))) {
315                         untag = 1;
316                         if (*buf) buf++;
317                 } else if (*buf == '*') {
318                         pvid_port |= (1 << j);
319                         buf++;
320                 } else if (*buf == 't' || isspace(*buf)) {
321                         buf++;
322                 } else break;
323
324                 if (!untag)
325                         tag |= 1 << j;
326                 
327                 while (isspace(*buf)) buf++;
328         }
329         
330         if (*buf)
331                 return -1;
332
333         return (pvid_port << 16) | (tag << 8) | vlan;
334 }
335
336
337 int switch_register_driver(switch_driver *driver)
338 {
339         struct list_head *pos;
340         switch_driver *new;
341         int ret;
342         
343         list_for_each(pos, &drivers.list) {
344                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
345                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
346                         return -EINVAL;
347                 }
348         }
349
350         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
351         memcpy(new, driver, sizeof(switch_driver));
352         new->name = strdup(driver->name);
353         
354         if ((ret = do_register(new)) < 0) {
355                 kfree(new->name);
356                 kfree(new);
357                 return ret;
358         }
359         INIT_LIST_HEAD(&new->list);
360         list_add(&new->list, &drivers.list);
361
362         return 0;
363 }
364
365 void switch_unregister_driver(char *name) {
366         struct list_head *pos, *q;
367         switch_driver *tmp;
368
369         list_for_each_safe(pos, q, &drivers.list) {
370                 tmp = list_entry(pos, switch_driver, list);
371                 if (strcmp(tmp->name, name) == 0) {
372                         do_unregister(tmp);
373                         list_del(pos);
374                         kfree(tmp->name);
375                         kfree(tmp);
376
377                         return;
378                 }
379         }
380 }
381
382 static int __init switch_init()
383 {
384         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
385                 printk("%s: proc_mkdir failed.\n", __FILE__);
386                 return -ENODEV;
387         }
388
389         INIT_LIST_HEAD(&drivers.list);
390         
391         return 0;
392 }
393
394 static void __exit switch_exit()
395 {
396         remove_proc_entry("vlan", NULL);
397 }
398
399 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
400 MODULE_LICENSE("GPL");
401
402 EXPORT_SYMBOL(switch_register_driver);
403 EXPORT_SYMBOL(switch_unregister_driver);
404 EXPORT_SYMBOL(switch_parse_vlan);
405 EXPORT_SYMBOL(switch_parse_media);
406 EXPORT_SYMBOL(switch_print_media);
407
408 module_init(switch_init);
409 module_exit(switch_exit);