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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / isdn / hysdn / hysdn_procconf.c
blob90b35e1a4b7e6e85c9d8ea4374184d3c6c02f40c
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/cred.h>
15 #include <linux/module.h>
16 #include <linux/poll.h>
17 #include <linux/proc_fs.h>
18 #include <linux/pci.h>
19 #include <linux/smp_lock.h>
20 #include <net/net_namespace.h>
21
22 #include "hysdn_defs.h"
23
24 static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";
25
26 #define INFO_OUT_LEN 80 /* length of info line including lf */
27
28 /********************************************************/
29 /* defines and data structure for conf write operations */
30 /********************************************************/
31 #define CONF_STATE_DETECT 0 /* waiting for detect */
32 #define CONF_STATE_CONF 1 /* writing config data */
33 #define CONF_STATE_POF 2 /* writing pof data */
34 #define CONF_LINE_LEN 255 /* 255 chars max */
35
36 struct conf_writedata {
37 hysdn_card *card; /* card the device is connected to */
38 int buf_size; /* actual number of bytes in the buffer */
39 int needed_size; /* needed size when reading pof */
40 int state; /* actual interface states from above constants */
41 unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */
42 unsigned short channel; /* active channel number */
43 unsigned char *pof_buffer; /* buffer when writing pof */
44 };
45
46 /***********************************************************************/
47 /* process_line parses one config line and transfers it to the card if */
48 /* necessary. */
49 /* if the return value is negative an error occurred. */
50 /***********************************************************************/
51 static int
52 process_line(struct conf_writedata *cnf)
53 {
54 unsigned char *cp = cnf->conf_line;
55 int i;
56
57 if (cnf->card->debug_flags & LOG_CNF_LINE)
58 hysdn_addlog(cnf->card, "conf line: %s", cp);
59
60 if (*cp == '-') { /* option */
61 cp++; /* point to option char */
62
63 if (*cp++ != 'c')
64 return (0); /* option unknown or used */
65 i = 0; /* start value for channel */
66 while ((*cp <= '9') && (*cp >= '0'))
67 i = i * 10 + *cp++ - '0'; /* get decimal number */
68 if (i > 65535) {
69 if (cnf->card->debug_flags & LOG_CNF_MISC)
70 hysdn_addlog(cnf->card, "conf channel invalid %d", i);
71 return (-ERR_INV_CHAN); /* invalid channel */
72 }
73 cnf->channel = i & 0xFFFF; /* set new channel number */
74 return (0); /* success */
75 } /* option */
76 if (*cp == '*') { /* line to send */
77 if (cnf->card->debug_flags & LOG_CNF_DATA)
78 hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp);
79 return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1,
80 cnf->channel)); /* send the line without * */
81 } /* line to send */
82 return (0);
83 } /* process_line */
84
85 /***********************************/
86 /* conf file operations and tables */
87 /***********************************/
88
89 /****************************************************/
90 /* write conf file -> boot or send cfg line to card */
91 /****************************************************/
92 static ssize_t
93 hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
94 {
95 struct conf_writedata *cnf;
96 int i;
97 unsigned char ch, *cp;
98
99 if (!count)
100 return (0); /* nothing to handle */
101
102 if (!(cnf = file->private_data))
103 return (-EFAULT); /* should never happen */
104
105 if (cnf->state == CONF_STATE_DETECT) { /* auto detect cnf or pof data */
106 if (copy_from_user(&ch, buf, 1)) /* get first char for detect */
107 return (-EFAULT);
108
109 if (ch == 0x1A) {
110 /* we detected a pof file */
111 if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0)
112 return (cnf->needed_size); /* an error occurred -> exit */
113 cnf->buf_size = 0; /* buffer is empty */
114 cnf->state = CONF_STATE_POF; /* new state */
115 } else {
116 /* conf data has been detected */
117 cnf->buf_size = 0; /* buffer is empty */
118 cnf->state = CONF_STATE_CONF; /* requested conf data write */
119 if (cnf->card->state != CARD_STATE_RUN)
120 return (-ERR_NOT_BOOTED);
121 cnf->conf_line[CONF_LINE_LEN - 1] = 0; /* limit string length */
122 cnf->channel = 4098; /* default channel for output */
123 }
124 } /* state was auto detect */
125 if (cnf->state == CONF_STATE_POF) { /* pof write active */
126 i = cnf->needed_size - cnf->buf_size; /* bytes still missing for write */
127 if (i <= 0)
128 return (-EINVAL); /* size error handling pof */
129
130 if (i < count)
131 count = i; /* limit requested number of bytes */
132 if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count))
133 return (-EFAULT); /* error while copying */
134 cnf->buf_size += count;
135
136 if (cnf->needed_size == cnf->buf_size) {
137 cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size); /* write data */
138 if (cnf->needed_size <= 0) {
139 cnf->card->state = CARD_STATE_BOOTERR; /* show boot error */
140 return (cnf->needed_size); /* an error occurred */
141 }
142 cnf->buf_size = 0; /* buffer is empty again */
143 }
144 }
145 /* pof write active */
146 else { /* conf write active */
147
148 if (cnf->card->state != CARD_STATE_RUN) {
149 if (cnf->card->debug_flags & LOG_CNF_MISC)
150 hysdn_addlog(cnf->card, "cnf write denied -> not booted");
151 return (-ERR_NOT_BOOTED);
152 }
153 i = (CONF_LINE_LEN - 1) - cnf->buf_size; /* bytes available in buffer */
154 if (i > 0) {
155 /* copy remaining bytes into buffer */
156
157 if (count > i)
158 count = i; /* limit transfer */
159 if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count))
160 return (-EFAULT); /* error while copying */
161
162 i = count; /* number of chars in buffer */
163 cp = cnf->conf_line + cnf->buf_size;
164 while (i) {
165 /* search for end of line */
166 if ((*cp < ' ') && (*cp != 9))
167 break; /* end of line found */
168 cp++;
169 i--;
170 } /* search for end of line */
171
172 if (i) {
173 /* delimiter found */
174 *cp++ = 0; /* string termination */
175 count -= (i - 1); /* subtract remaining bytes from count */
176 while ((i) && (*cp < ' ') && (*cp != 9)) {
177 i--; /* discard next char */
178 count++; /* mark as read */
179 cp++; /* next char */
180 }
181 cnf->buf_size = 0; /* buffer is empty after transfer */
182 if ((i = process_line(cnf)) < 0) /* handle the line */
183 count = i; /* return the error */
184 }
185 /* delimiter found */
186 else {
187 cnf->buf_size += count; /* add chars to string */
188 if (cnf->buf_size >= CONF_LINE_LEN - 1) {
189 if (cnf->card->debug_flags & LOG_CNF_MISC)
190 hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count);
191 return (-ERR_CONF_LONG);
192 }
193 } /* not delimited */
194
195 }
196 /* copy remaining bytes into buffer */
197 else {
198 if (cnf->card->debug_flags & LOG_CNF_MISC)
199 hysdn_addlog(cnf->card, "cnf line too long");
200 return (-ERR_CONF_LONG);
201 }
202 } /* conf write active */
203
204 return (count);
205 } /* hysdn_conf_write */
206
207 /*******************************************/
208 /* read conf file -> output card info data */
209 /*******************************************/
210 static ssize_t
211 hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t *off)
212 {
213 char *cp;
214
215 if (!(file->f_mode & FMODE_READ))
216 return -EPERM; /* no permission to read */
217
218 if (!(cp = file->private_data))
219 return -EFAULT; /* should never happen */
220
221 return simple_read_from_buffer(buf, count, off, cp, strlen(cp));
222 } /* hysdn_conf_read */
223
224 /******************/
225 /* open conf file */
226 /******************/
227 static int
228 hysdn_conf_open(struct inode *ino, struct file *filep)
229 {
230 hysdn_card *card;
231 struct proc_dir_entry *pd;
232 struct conf_writedata *cnf;
233 char *cp, *tmp;
234
235 /* now search the addressed card */
236 lock_kernel();
237 card = card_root;
238 while (card) {
239 pd = card->procconf;
240 if (pd == PDE(ino))
241 break;
242 card = card->next; /* search next entry */
243 }
244 if (!card) {
245 unlock_kernel();
246 return (-ENODEV); /* device is unknown/invalid */
247 }
248 if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
249 hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
250 filep->f_cred->fsuid, filep->f_cred->fsgid,
251 filep->f_mode);
252
253 if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
254 /* write only access -> write boot file or conf line */
255
256 if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
257 unlock_kernel();
258 return (-EFAULT);
259 }
260 cnf->card = card;
261 cnf->buf_size = 0; /* nothing buffered */
262 cnf->state = CONF_STATE_DETECT; /* start auto detect */
263 filep->private_data = cnf;
264
265 } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
266 /* read access -> output card info data */
267
268 if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
269 unlock_kernel();
270 return (-EFAULT); /* out of memory */
271 }
272 filep->private_data = tmp; /* start of string */
273
274 /* first output a headline */
275 sprintf(tmp, "id bus slot type irq iobase dp-mem b-chans fax-chans state device");
276 cp = tmp; /* start of string */
277 while (*cp)
278 cp++;
279 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
280 *cp++ = ' ';
281 *cp++ = '\n';
282
283 /* and now the data */
284 sprintf(cp, "%d %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d %s",
285 card->myid,
286 card->bus,
287 PCI_SLOT(card->devfn),
288 card->brdtype,
289 card->irq,
290 card->iobase,
291 card->membase,
292 card->bchans,
293 card->faxchans,
294 card->state,
295 hysdn_net_getname(card));
296 while (*cp)
297 cp++;
298 while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
299 *cp++ = ' ';
300 *cp++ = '\n';
301 *cp = 0; /* end of string */
302 } else { /* simultaneous read/write access forbidden ! */
303 unlock_kernel();
304 return (-EPERM); /* no permission this time */
305 }
306 unlock_kernel();
307 return nonseekable_open(ino, filep);
308 } /* hysdn_conf_open */
309
310 /***************************/
311 /* close a config file. */
312 /***************************/
313 static int
314 hysdn_conf_close(struct inode *ino, struct file *filep)
315 {
316 hysdn_card *card;
317 struct conf_writedata *cnf;
318 int retval = 0;
319 struct proc_dir_entry *pd;
320
321 lock_kernel();
322 /* search the addressed card */
323 card = card_root;
324 while (card) {
325 pd = card->procconf;
326 if (pd == PDE(ino))
327 break;
328 card = card->next; /* search next entry */
329 }
330 if (!card) {
331 unlock_kernel();
332 return (-ENODEV); /* device is unknown/invalid */
333 }
334 if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
335 hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
336 filep->f_cred->fsuid, filep->f_cred->fsgid,
337 filep->f_mode);
338
339 if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
340 /* write only access -> write boot file or conf line */
341 if (filep->private_data) {
342 cnf = filep->private_data;
343
344 if (cnf->state == CONF_STATE_POF)
345 retval = pof_write_close(cnf->card); /* close the pof write */
346 kfree(filep->private_data); /* free allocated memory for buffer */
347
348 } /* handle write private data */
349 } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
350 /* read access -> output card info data */
351
352 kfree(filep->private_data); /* release memory */
353 }
354 unlock_kernel();
355 return (retval);
356 } /* hysdn_conf_close */
357
358 /******************************************************/
359 /* table for conf filesystem functions defined above. */
360 /******************************************************/
361 static const struct file_operations conf_fops =
362 {
363 .owner = THIS_MODULE,
364 .llseek = no_llseek,
365 .read = hysdn_conf_read,
366 .write = hysdn_conf_write,
367 .open = hysdn_conf_open,
368 .release = hysdn_conf_close,
369 };
370
371 /*****************************/
372 /* hysdn subdir in /proc/net */
373 /*****************************/
374 struct proc_dir_entry *hysdn_proc_entry = NULL;
375
376 /*******************************************************************************/
377 /* hysdn_procconf_init is called when the module is loaded and after the cards */
378 /* have been detected. The needed proc dir and card config files are created. */
379 /* The log init is called at last. */
380 /*******************************************************************************/
381 int
382 hysdn_procconf_init(void)
383 {
384 hysdn_card *card;
385 unsigned char conf_name[20];
386
387 hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, init_net.proc_net);
388 if (!hysdn_proc_entry) {
389 printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
390 return (-1);
391 }
392 card = card_root; /* point to first card */
393 while (card) {
394
395 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
396 if ((card->procconf = (void *) proc_create(conf_name,
397 S_IFREG | S_IRUGO | S_IWUSR,
398 hysdn_proc_entry,
399 &conf_fops)) != NULL) {
400 hysdn_proclog_init(card); /* init the log file entry */
401 }
402 card = card->next; /* next entry */
403 }
404
405 printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision));
406 return (0);
407 } /* hysdn_procconf_init */
408
409 /*************************************************************************************/
410 /* hysdn_procconf_release is called when the module is unloaded and before the cards */
411 /* resources are released. The module counter is assumed to be 0 ! */
412 /*************************************************************************************/
413 void
414 hysdn_procconf_release(void)
415 {
416 hysdn_card *card;
417 unsigned char conf_name[20];
418
419 card = card_root; /* start with first card */
420 while (card) {
421
422 sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
423 if (card->procconf)
424 remove_proc_entry(conf_name, hysdn_proc_entry);
425
426 hysdn_proclog_release(card); /* init the log file entry */
427
428 card = card->next; /* point to next card */
429 }
430
431 remove_proc_entry(PROC_SUBDIR_NAME, init_net.proc_net);
432 }