1 /* $Id: hysdn_procconf.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
2 *
3 * Linux driver for HYSDN cards, /proc/net filesystem dir and conf functions.
4 *
5 * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH
6 *
7 * Copyright 1999 by Werner Cornelius (werner@titro.de)
8 *
9 * This software may be used and distributed according to the terms
10 * of the GNU General Public License, incorporated herein by reference.
11 *
12 */
13
14 #include <linux/module.h>
15 #include <linux/poll.h>
16 #include <linux/proc_fs.h>
17 #include <linux/pci.h>
18 #include <linux/smp_lock.h>
19 #include <net/net_namespace.h>
20
21 #include "hysdn_defs.h"
22
23 static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";
24
25 #define INFO_OUT_LEN 80 /* length of info line including lf */
26
27 /********************************************************/
28 /* defines and data structure for conf write operations */
29 /********************************************************/
30 #define CONF_STATE_DETECT 0 /* waiting for detect */
31 #define CONF_STATE_CONF 1 /* writing config data */
32 #define CONF_STATE_POF 2 /* writing pof data */
33 #define CONF_LINE_LEN 255 /* 255 chars max */
34
35 struct conf_writedata {
36 hysdn_card *card; /* card the device is connected to */
37 int buf_size; /* actual number of bytes in the buffer */
38 int needed_size; /* needed size when reading pof */
39 int state; /* actual interface states from above constants */
40 unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */
41 unsigned short channel; /* active channel number */
42 unsigned char *pof_buffer; /* buffer when writing pof */
43 };
44
45 /***********************************************************************/
46 /* process_line parses one config line and transfers it to the card if */
47 /* necessary. */
48 /* if the return value is negative an error occurred. */
49 /***********************************************************************/
50 static int
51 process_line(struct conf_writedata *cnf)
52 {
53 unsigned char *cp = cnf->conf_line;
54 int i;
55
56 if (cnf->card->debug_flags & LOG_CNF_LINE)
57 hysdn_addlog(cnf->card, "conf line: %s", cp);
58
59 if (*cp == '-') { /* option */
60 cp++; /* point to option char */
61
62 if (*cp++ != 'c')
63 return (0); /* option unknown or used */
64 i = 0; /* start value for channel */
65 while ((*cp <= '9') && (*cp >= ''))
66 i = i * 10 + *cp++ - ''; /* get decimal number */
67 if (i > 65535) {
68 if (cnf->card->debug_flags & LOG_CNF_MISC)
69 hysdn_addlog(cnf->card, "conf channel invalid %d", i);
70 return (-ERR_INV_CHAN); /* invalid channel */
71 }
72 cnf->channel = i & 0xFFFF; /* set new channel number */
73 return (0); /* success */
74 } /* option */
75 if (*cp == '*') { /* line to send */
76 if (cnf->card->debug_flags & LOG_CNF_DATA)
77 hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp);
78 return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1,
79 cnf->channel)); /* send the line without * */
80 } /* line to send */
81 return (0);
82 } /* process_line */
83
84 /***********************************/
85 /* conf file operations and tables */
86 /***********************************/
87
88 /****************************************************/
89 /* write conf file -> boot or send cfg line to card */
90 /****************************************************/
91 static ssize_t
92 hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
93 {
94 struct conf_writedata *cnf;
95 int i;
96 unsigned char ch, *cp;
97
98 if (!count)
99 return (0); /* nothing to handle */
100
101 if (!(cnf = file->private_data))
102 return (-EFAULT); /* should never happen */
103
104 if (cnf->state == CONF_STATE_DETECT) { /* auto detect cnf or pof data */
105 if (copy_from_user(&ch, buf, 1)) /* get first char for detect */
106 return (-EFAULT);
107
108 if (ch == 0x1A) {
109 /* we detected a pof file */
110 if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0)
111 return (cnf->needed_size); /* an error occurred -> exit */
112 cnf->buf_size = 0; /* buffer is empty */
113 cnf->state = CONF_STATE_POF; /* new state */
114 } else {
115 /* conf data has been detected */
116 cnf->buf_size = 0; /* buffer is empty */
117 cnf->state = CONF_STATE_CONF; /* requested conf data write */
118 if (cnf->card->state != CARD_STATE_RUN)
119 return (-ERR_NOT_BOOTED);
120 cnf->conf_line[CONF_LINE_LEN - 1] = 0; /* limit string length */
121 cnf->channel = 4098; /* default channel for output */
122 }
123 } /* state was auto detect */
124 if (cnf->state == CONF_STATE_POF) { /* pof write active */
125 i = cnf->needed_size - cnf->buf_size; /* bytes still missing for write */
126 if (i <= 0)
127 return (-EINVAL); /* size error handling pof */
128
129 if (i < count)
130 count = i; /* limit requested number of bytes */
131 if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count))
132 return (-EFAULT); /* error while copying */
133 cnf->buf_size += count;
134
135 if (cnf->needed_size == cnf->buf_size) {
136 cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size); /* write data */
137 if (cnf->needed_size <= 0) {
138 cnf->card->state = CARD_STATE_BOOTERR; /* show boot error */
139 return (cnf->needed_size); /* an error occurred */
140 }
141 cnf->buf_size = 0; /* buffer is empty again */
142 }
143 }
144 /* pof write active */
145 else { /* conf write active */
146
147 if (cnf->card->state != CARD_STATE_RUN) {
148 if (cnf->card->debug_flags & LOG_CNF_MISC)
149 hysdn_addlog(cnf->card, "cnf write denied -> not booted");
150 return (-ERR_NOT_BOOTED);
151 }
152 i = (CONF_LINE_LEN - 1) - cnf->buf_size; /* bytes available in buffer */
153 if (i > 0) {
154 /* copy remaining bytes into buffer */
155
156 if (count > i)
157 count = i; /* limit transfer */
158 if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count))
159 return (-EFAULT); /* error while copying */
160
161 i = count; /* number of chars in buffer */
162 cp = cnf->conf_line + cnf->buf_size;
163 while (i) {
164 /* search for end of line */
165 if ((*cp < ' ') && (*cp != 9))
166 break; /* end of line found */
167 cp++;
168 i--;
169 } /* search for end of line */
170
171 if (i) {
172 /* delimiter found */
173 *cp++ = 0; /* string termination */
174 count -= (i - 1); /* subtract remaining bytes from count */
175 while ((i) && (*cp < ' ') && (*cp != 9)) {
176 i--; /* discard next char */
177 count++; /* mark as read */
178 cp++; /* next char */
179 }
180 cnf->buf_size = 0; /* buffer is empty after transfer */
181 if ((i = process_line(cnf)) < 0) /* handle the line */
182 count = i; /* return the error */
183 }
184 /* delimiter found */
185 else {
186 cnf->buf_size += count; /* add chars to string */
187 if (cnf->buf_size >= CONF_LINE_LEN - 1) {
188 if (cnf->card->debug_flags & LOG_CNF_MISC)
189 hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count);
190 return (-ERR_CONF_LONG);
191 }
192 } /* not delimited */
193
194 }
195 /* copy remaining bytes into buffer */
196 else {
197 if (cnf->card->debug_flags & LOG_CNF_MISC)
198 hysdn_addlog(cnf->card, "cnf line too long");
199 return (-ERR_CONF_LONG);
200 }
201 } /* conf write active */
202
203 return (count);
204 } /* hysdn_conf_write */
205
206 /*******************************************/
207 /* read conf file -> output card info data */
208 /*******************************************/
209 static ssize_t
210 hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t *off)
211 {
212 char *cp;
213
214 if (!(file->f_mode & FMODE_READ))
215 return -EPERM; /* no permission to read */
216
217 if (!(cp = file->private_data))
218 return -EFAULT; /* should never happen */
219
220 return simple_read_from_buffer(buf, count, off, cp, strlen(cp));
221 } /* hysdn_conf_read */
222
223 /******************/
224 /* open conf file */
225 /******************/
226 static int
227 hysdn_conf_open(struct inode *ino, struct file *filep)
228 {
229 hysdn_card *card;
230 struct proc_dir_entry *pd;
231 struct conf_writedata *cnf;
232 char *cp, *tmp;
233
234 /* now search the addressed card */
235 lock_kernel();
236 card = card_root;
237 while (card) {
238 pd = card->procconf;
239 if (pd == PDE(ino))
240 break;
241 card = card->next; /* search next entry */
242 }
243 if (!card) {
244 unlock_kernel();
245 return (-ENODEV); /* device is unknown/invalid */
246 }
247 if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
248 hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
249 filep->f_cred->fsuid, filep->f_cred->fsgid,
250 filep->f_mode);
251
252 if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
253 /* write only access -> write boot file or conf line */
254
255 if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
256 unlock_kernel();
257 return (-EFAULT);
258 }
259 cnf->card = card;
260 cnf->buf_size = 0; /* nothing buffered */
261 cnf->state = CONF_STATE_DETECT; /* start auto detect */
262 filep->private_data = cnf;
263
264 } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
265 /* read access -> output card info data */
266
267 if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
268 unlock_kernel();
269 return (-EFAULT); /* out of memory */
270 }
271 filep->private_data = tmp; /* start of string */
272
273 /* first output a headline */
274 sprintf(tmp, "id bus slot type irq iobase dp-mem b-chans fax-chans state device");
275 cp = tmp; /* start of string */
276 while (*cp)
277 cp++;
278 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
279 *cp++ = ' ';
280 *cp++ = '\n';
281
282 /* and now the data */
283 sprintf(cp, "%d %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d %s",
284 card->myid,
285 card->bus,
286 PCI_SLOT(card->devfn),
287 card->brdtype,
288 card->irq,
289 card->iobase,
290 card->membase,
291 card->bchans,
292 card->faxchans,
293 card->state,
294 hysdn_net_getname(card));
295 while (*cp)
296 cp++;
297 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
298 *cp++ = ' ';
299 *cp++ = '\n';
300 *cp = 0; /* end of string */
301 } else { /* simultaneous read/write access forbidden ! */
302 unlock_kernel();
303 return (-EPERM); /* no permission this time */
304 }
305 unlock_kernel();
306 return nonseekable_open(ino, filep);
307 } /* hysdn_conf_open */
308
309 /***************************/
310 /* close a config file. */
311 /***************************/
312 static int
313 hysdn_conf_close(struct inode *ino, struct file *filep)
314 {
315 hysdn_card *card;
316 struct conf_writedata *cnf;
317 int retval = 0;
318 struct proc_dir_entry *pd;
319
320 lock_kernel();
321 /* search the addressed card */
322 card = card_root;
323 while (card) {
324 pd = card->procconf;
325 if (pd == PDE(ino))
326 break;
327 card = card->next; /* search next entry */
328 }
329 if (!card) {
330 unlock_kernel();
331 return (-ENODEV); /* device is unknown/invalid */
332 }
333 if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
334 hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
335 filep->f_cred->fsuid, filep->f_cred->fsgid,
336 filep->f_mode);
337
338 if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
339 /* write only access -> write boot file or conf line */
340 if (filep->private_data) {
341 cnf = filep->private_data;
342
343 if (cnf->state == CONF_STATE_POF)
344 retval = pof_write_close(cnf->card); /* close the pof write */
345 kfree(filep->private_data); /* free allocated memory for buffer */
346
347 } /* handle write private data */
348 } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
349 /* read access -> output card info data */
350
351 kfree(filep->private_data); /* release memory */
352 }
353 unlock_kernel();
354 return (retval);
355 } /* hysdn_conf_close */
356
357 /******************************************************/
358 /* table for conf filesystem functions defined above. */
359 /******************************************************/
360 static const struct file_operations conf_fops =
361 {
362 .owner = THIS_MODULE,
363 .llseek = no_llseek,
364 .read = hysdn_conf_read,
365 .write = hysdn_conf_write,
366 .open = hysdn_conf_open,
367 .release = hysdn_conf_close,
368 };
369
370 /*****************************/
371 /* hysdn subdir in /proc/net */
372 /*****************************/
373 struct proc_dir_entry *hysdn_proc_entry = NULL;
374
375 /*******************************************************************************/
376 /* hysdn_procconf_init is called when the module is loaded and after the cards */
377 /* have been detected. The needed proc dir and card config files are created. */
378 /* The log init is called at last. */
379 /*******************************************************************************/
380 int
381 hysdn_procconf_init(void)
382 {
383 hysdn_card *card;
384 unsigned char conf_name[20];
385
386 hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net);
387 if (!hysdn_proc_entry) {
388 printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
389 return (-1);
390 }
391 card = card_root; /* point to first card */
392 while (card) {
393
394 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
395 if ((card->procconf = (void *) proc_create(conf_name,
396 S_IFREG | S_IRUGO | S_IWUSR,
397 hysdn_proc_entry,
398 &conf_fops)) != NULL) {
399 hysdn_proclog_init(card); /* init the log file entry */
400 }
401 card = card->next; /* next entry */
402 }
403
404 printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision));
405 return (0);
406 } /* hysdn_procconf_init */
407
408 /*************************************************************************************/
409 /* hysdn_procconf_release is called when the module is unloaded and before the cards */
410 /* resources are released. The module counter is assumed to be 0 ! */
411 /*************************************************************************************/
412 void
413 hysdn_procconf_release(void)
414 {
415 hysdn_card *card;
416 unsigned char conf_name[20];
417
418 card = card_root; /* start with first card */
419 while (card) {
420
421 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
422 if (card->procconf)
423 remove_proc_entry(conf_name, hysdn_proc_entry);
424
425 hysdn_proclog_release(card); /* init the log file entry */
426
427 card = card->next; /* point to next card */
428 }
429
430 remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net);
431 }
432
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