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1da177e4 LT |
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/version.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/proc_fs.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/smp_lock.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 | uchar conf_line[CONF_LINE_LEN]; /* buffered conf line */ | |
41 | word channel; /* active channel number */ | |
42 | uchar *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 | uchar *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 >= '0')) | |
66 | i = i * 10 + *cp++ - '0'; /* 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 | uchar 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 | int i; | |
214 | ||
215 | if (file->f_mode & FMODE_READ) { | |
216 | if (!(cp = file->private_data)) | |
217 | return (-EFAULT); /* should never happen */ | |
218 | i = strlen(cp); /* get total string length */ | |
219 | if (*off < i) { | |
220 | /* still bytes to transfer */ | |
221 | cp += *off; /* point to desired data offset */ | |
222 | i -= *off; /* remaining length */ | |
223 | if (i > count) | |
224 | i = count; /* limit length to transfer */ | |
225 | if (copy_to_user(buf, cp, i)) | |
226 | return (-EFAULT); /* copy error */ | |
227 | *off += i; /* adjust offset */ | |
228 | } else | |
229 | return (0); | |
230 | } else | |
231 | return (-EPERM); /* no permission to read */ | |
232 | ||
233 | return (i); | |
234 | } /* hysdn_conf_read */ | |
235 | ||
236 | /******************/ | |
237 | /* open conf file */ | |
238 | /******************/ | |
239 | static int | |
240 | hysdn_conf_open(struct inode *ino, struct file *filep) | |
241 | { | |
242 | hysdn_card *card; | |
243 | struct proc_dir_entry *pd; | |
244 | struct conf_writedata *cnf; | |
245 | char *cp, *tmp; | |
246 | ||
247 | /* now search the addressed card */ | |
248 | lock_kernel(); | |
249 | card = card_root; | |
250 | while (card) { | |
251 | pd = card->procconf; | |
252 | if (pd == PDE(ino)) | |
253 | break; | |
254 | card = card->next; /* search next entry */ | |
255 | } | |
256 | if (!card) { | |
257 | unlock_kernel(); | |
258 | return (-ENODEV); /* device is unknown/invalid */ | |
259 | } | |
260 | if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL)) | |
261 | hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x", | |
262 | filep->f_uid, filep->f_gid, filep->f_mode); | |
263 | ||
264 | if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { | |
265 | /* write only access -> write boot file or conf line */ | |
266 | ||
267 | if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) { | |
268 | unlock_kernel(); | |
269 | return (-EFAULT); | |
270 | } | |
271 | cnf->card = card; | |
272 | cnf->buf_size = 0; /* nothing buffered */ | |
273 | cnf->state = CONF_STATE_DETECT; /* start auto detect */ | |
274 | filep->private_data = cnf; | |
275 | ||
276 | } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { | |
277 | /* read access -> output card info data */ | |
278 | ||
279 | if (!(tmp = (char *) kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) { | |
280 | unlock_kernel(); | |
281 | return (-EFAULT); /* out of memory */ | |
282 | } | |
283 | filep->private_data = tmp; /* start of string */ | |
284 | ||
285 | /* first output a headline */ | |
286 | sprintf(tmp, "id bus slot type irq iobase dp-mem b-chans fax-chans state device"); | |
287 | cp = tmp; /* start of string */ | |
288 | while (*cp) | |
289 | cp++; | |
290 | while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN) | |
291 | *cp++ = ' '; | |
292 | *cp++ = '\n'; | |
293 | ||
294 | /* and now the data */ | |
295 | sprintf(cp, "%d %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d %s", | |
296 | card->myid, | |
297 | card->bus, | |
298 | PCI_SLOT(card->devfn), | |
299 | card->brdtype, | |
300 | card->irq, | |
301 | card->iobase, | |
302 | card->membase, | |
303 | card->bchans, | |
304 | card->faxchans, | |
305 | card->state, | |
306 | hysdn_net_getname(card)); | |
307 | while (*cp) | |
308 | cp++; | |
309 | while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN) | |
310 | *cp++ = ' '; | |
311 | *cp++ = '\n'; | |
312 | *cp = 0; /* end of string */ | |
313 | } else { /* simultaneous read/write access forbidden ! */ | |
314 | unlock_kernel(); | |
315 | return (-EPERM); /* no permission this time */ | |
316 | } | |
317 | unlock_kernel(); | |
318 | return nonseekable_open(ino, filep); | |
319 | } /* hysdn_conf_open */ | |
320 | ||
321 | /***************************/ | |
322 | /* close a config file. */ | |
323 | /***************************/ | |
324 | static int | |
325 | hysdn_conf_close(struct inode *ino, struct file *filep) | |
326 | { | |
327 | hysdn_card *card; | |
328 | struct conf_writedata *cnf; | |
329 | int retval = 0; | |
330 | struct proc_dir_entry *pd; | |
331 | ||
332 | lock_kernel(); | |
333 | /* search the addressed card */ | |
334 | card = card_root; | |
335 | while (card) { | |
336 | pd = card->procconf; | |
337 | if (pd == PDE(ino)) | |
338 | break; | |
339 | card = card->next; /* search next entry */ | |
340 | } | |
341 | if (!card) { | |
342 | unlock_kernel(); | |
343 | return (-ENODEV); /* device is unknown/invalid */ | |
344 | } | |
345 | if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL)) | |
346 | hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x", | |
347 | filep->f_uid, filep->f_gid, filep->f_mode); | |
348 | ||
349 | if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { | |
350 | /* write only access -> write boot file or conf line */ | |
351 | if (filep->private_data) { | |
352 | cnf = filep->private_data; | |
353 | ||
354 | if (cnf->state == CONF_STATE_POF) | |
355 | retval = pof_write_close(cnf->card); /* close the pof write */ | |
356 | kfree(filep->private_data); /* free allocated memory for buffer */ | |
357 | ||
358 | } /* handle write private data */ | |
359 | } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { | |
360 | /* read access -> output card info data */ | |
361 | ||
362 | if (filep->private_data) | |
363 | kfree(filep->private_data); /* release memory */ | |
364 | } | |
365 | unlock_kernel(); | |
366 | return (retval); | |
367 | } /* hysdn_conf_close */ | |
368 | ||
369 | /******************************************************/ | |
370 | /* table for conf filesystem functions defined above. */ | |
371 | /******************************************************/ | |
372 | static struct file_operations conf_fops = | |
373 | { | |
374 | .llseek = no_llseek, | |
375 | .read = hysdn_conf_read, | |
376 | .write = hysdn_conf_write, | |
377 | .open = hysdn_conf_open, | |
378 | .release = hysdn_conf_close, | |
379 | }; | |
380 | ||
381 | /*****************************/ | |
382 | /* hysdn subdir in /proc/net */ | |
383 | /*****************************/ | |
384 | struct proc_dir_entry *hysdn_proc_entry = NULL; | |
385 | ||
386 | /*******************************************************************************/ | |
387 | /* hysdn_procconf_init is called when the module is loaded and after the cards */ | |
388 | /* have been detected. The needed proc dir and card config files are created. */ | |
389 | /* The log init is called at last. */ | |
390 | /*******************************************************************************/ | |
391 | int | |
392 | hysdn_procconf_init(void) | |
393 | { | |
394 | hysdn_card *card; | |
395 | uchar conf_name[20]; | |
396 | ||
397 | hysdn_proc_entry = create_proc_entry(PROC_SUBDIR_NAME, S_IFDIR | S_IRUGO | S_IXUGO, proc_net); | |
398 | if (!hysdn_proc_entry) { | |
399 | printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n"); | |
400 | return (-1); | |
401 | } | |
402 | card = card_root; /* point to first card */ | |
403 | while (card) { | |
404 | ||
405 | sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid); | |
406 | if ((card->procconf = (void *) create_proc_entry(conf_name, | |
407 | S_IFREG | S_IRUGO | S_IWUSR, | |
408 | hysdn_proc_entry)) != NULL) { | |
409 | ((struct proc_dir_entry *) card->procconf)->proc_fops = &conf_fops; | |
410 | ((struct proc_dir_entry *) card->procconf)->owner = THIS_MODULE; | |
411 | hysdn_proclog_init(card); /* init the log file entry */ | |
412 | } | |
413 | card = card->next; /* next entry */ | |
414 | } | |
415 | ||
416 | printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision)); | |
417 | return (0); | |
418 | } /* hysdn_procconf_init */ | |
419 | ||
420 | /*************************************************************************************/ | |
421 | /* hysdn_procconf_release is called when the module is unloaded and before the cards */ | |
422 | /* resources are released. The module counter is assumed to be 0 ! */ | |
423 | /*************************************************************************************/ | |
424 | void | |
425 | hysdn_procconf_release(void) | |
426 | { | |
427 | hysdn_card *card; | |
428 | uchar conf_name[20]; | |
429 | ||
430 | card = card_root; /* start with first card */ | |
431 | while (card) { | |
432 | ||
433 | sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid); | |
434 | if (card->procconf) | |
435 | remove_proc_entry(conf_name, hysdn_proc_entry); | |
436 | ||
437 | hysdn_proclog_release(card); /* init the log file entry */ | |
438 | ||
439 | card = card->next; /* point to next card */ | |
440 | } | |
441 | ||
442 | remove_proc_entry(PROC_SUBDIR_NAME, proc_net); | |
443 | } |