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1da177e4 LT |
1 | /* $Id: hysdn_proclog.c,v 1.9.6.3 2001/09/23 22:24:54 kai Exp $ |
2 | * | |
3 | * Linux driver for HYSDN cards, /proc/net filesystem log functions. | |
4 | * | |
5 | * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH | |
6 | * Copyright 1999 by Werner Cornelius (werner@titro.de) | |
7 | * | |
8 | * This software may be used and distributed according to the terms | |
9 | * of the GNU General Public License, incorporated herein by reference. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/version.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/smp_lock.h> | |
19 | ||
20 | #include "hysdn_defs.h" | |
21 | ||
22 | /* the proc subdir for the interface is defined in the procconf module */ | |
23 | extern struct proc_dir_entry *hysdn_proc_entry; | |
24 | ||
aade0e82 AB |
25 | static void put_log_buffer(hysdn_card * card, char *cp); |
26 | ||
1da177e4 LT |
27 | /*************************************************/ |
28 | /* structure keeping ascii log for device output */ | |
29 | /*************************************************/ | |
30 | struct log_data { | |
31 | struct log_data *next; | |
32 | ulong usage_cnt; /* number of files still to work */ | |
33 | void *proc_ctrl; /* pointer to own control procdata structure */ | |
34 | char log_start[2]; /* log string start (final len aligned by size) */ | |
35 | }; | |
36 | ||
37 | /**********************************************/ | |
38 | /* structure holding proc entrys for one card */ | |
39 | /**********************************************/ | |
40 | struct procdata { | |
41 | struct proc_dir_entry *log; /* log entry */ | |
42 | char log_name[15]; /* log filename */ | |
43 | struct log_data *log_head, *log_tail; /* head and tail for queue */ | |
44 | int if_used; /* open count for interface */ | |
45 | int volatile del_lock; /* lock for delete operations */ | |
46 | uchar logtmp[LOG_MAX_LINELEN]; | |
47 | wait_queue_head_t rd_queue; | |
48 | }; | |
49 | ||
50 | ||
51 | /**********************************************/ | |
52 | /* log function for cards error log interface */ | |
53 | /**********************************************/ | |
54 | void | |
55 | hysdn_card_errlog(hysdn_card * card, tErrLogEntry * logp, int maxsize) | |
56 | { | |
57 | char buf[ERRLOG_TEXT_SIZE + 40]; | |
58 | ||
59 | sprintf(buf, "LOG 0x%08lX 0x%08lX : %s\n", logp->ulErrType, logp->ulErrSubtype, logp->ucText); | |
60 | put_log_buffer(card, buf); /* output the string */ | |
61 | } /* hysdn_card_errlog */ | |
62 | ||
63 | /***************************************************/ | |
64 | /* Log function using format specifiers for output */ | |
65 | /***************************************************/ | |
66 | void | |
67 | hysdn_addlog(hysdn_card * card, char *fmt,...) | |
68 | { | |
69 | struct procdata *pd = card->proclog; | |
70 | char *cp; | |
71 | va_list args; | |
72 | ||
73 | if (!pd) | |
74 | return; /* log structure non existent */ | |
75 | ||
76 | cp = pd->logtmp; | |
77 | cp += sprintf(cp, "HYSDN: card %d ", card->myid); | |
78 | ||
79 | va_start(args, fmt); | |
80 | cp += vsprintf(cp, fmt, args); | |
81 | va_end(args); | |
82 | *cp++ = '\n'; | |
83 | *cp = 0; | |
84 | ||
85 | if (card->debug_flags & DEB_OUT_SYSLOG) | |
86 | printk(KERN_INFO "%s", pd->logtmp); | |
87 | else | |
88 | put_log_buffer(card, pd->logtmp); | |
89 | ||
90 | } /* hysdn_addlog */ | |
91 | ||
92 | /********************************************/ | |
93 | /* put an log buffer into the log queue. */ | |
94 | /* This buffer will be kept until all files */ | |
95 | /* opened for read got the contents. */ | |
96 | /* Flushes buffers not longer in use. */ | |
97 | /********************************************/ | |
aade0e82 | 98 | static void |
1da177e4 LT |
99 | put_log_buffer(hysdn_card * card, char *cp) |
100 | { | |
101 | struct log_data *ib; | |
102 | struct procdata *pd = card->proclog; | |
103 | int i; | |
104 | unsigned long flags; | |
105 | ||
106 | if (!pd) | |
107 | return; | |
108 | if (!cp) | |
109 | return; | |
110 | if (!*cp) | |
111 | return; | |
112 | if (pd->if_used <= 0) | |
113 | return; /* no open file for read */ | |
114 | ||
115 | if (!(ib = (struct log_data *) kmalloc(sizeof(struct log_data) + strlen(cp), GFP_ATOMIC))) | |
116 | return; /* no memory */ | |
117 | strcpy(ib->log_start, cp); /* set output string */ | |
118 | ib->next = NULL; | |
119 | ib->proc_ctrl = pd; /* point to own control structure */ | |
120 | save_flags(flags); | |
121 | cli(); | |
122 | ib->usage_cnt = pd->if_used; | |
123 | if (!pd->log_head) | |
124 | pd->log_head = ib; /* new head */ | |
125 | else | |
126 | pd->log_tail->next = ib; /* follows existing messages */ | |
127 | pd->log_tail = ib; /* new tail */ | |
128 | i = pd->del_lock++; /* get lock state */ | |
129 | restore_flags(flags); | |
130 | ||
131 | /* delete old entrys */ | |
132 | if (!i) | |
133 | while (pd->log_head->next) { | |
134 | if ((pd->log_head->usage_cnt <= 0) && | |
135 | (pd->log_head->next->usage_cnt <= 0)) { | |
136 | ib = pd->log_head; | |
137 | pd->log_head = pd->log_head->next; | |
138 | kfree(ib); | |
139 | } else | |
140 | break; | |
141 | } /* pd->log_head->next */ | |
142 | pd->del_lock--; /* release lock level */ | |
143 | wake_up_interruptible(&(pd->rd_queue)); /* announce new entry */ | |
144 | } /* put_log_buffer */ | |
145 | ||
146 | ||
147 | /******************************/ | |
148 | /* file operations and tables */ | |
149 | /******************************/ | |
150 | ||
151 | /****************************************/ | |
152 | /* write log file -> set log level bits */ | |
153 | /****************************************/ | |
154 | static ssize_t | |
155 | hysdn_log_write(struct file *file, const char __user *buf, size_t count, loff_t * off) | |
156 | { | |
157 | ulong u = 0; | |
158 | int found = 0; | |
159 | uchar *cp, valbuf[128]; | |
160 | long base = 10; | |
161 | hysdn_card *card = (hysdn_card *) file->private_data; | |
162 | ||
163 | if (count > (sizeof(valbuf) - 1)) | |
164 | count = sizeof(valbuf) - 1; /* limit length */ | |
165 | if (copy_from_user(valbuf, buf, count)) | |
166 | return (-EFAULT); /* copy failed */ | |
167 | ||
168 | valbuf[count] = 0; /* terminating 0 */ | |
169 | cp = valbuf; | |
170 | if ((count > 2) && (valbuf[0] == '0') && (valbuf[1] == 'x')) { | |
171 | cp += 2; /* pointer after hex modifier */ | |
172 | base = 16; | |
173 | } | |
174 | /* scan the input for debug flags */ | |
175 | while (*cp) { | |
176 | if ((*cp >= '0') && (*cp <= '9')) { | |
177 | found = 1; | |
178 | u *= base; /* adjust to next digit */ | |
179 | u += *cp++ - '0'; | |
180 | continue; | |
181 | } | |
182 | if (base != 16) | |
183 | break; /* end of number */ | |
184 | ||
185 | if ((*cp >= 'a') && (*cp <= 'f')) { | |
186 | found = 1; | |
187 | u *= base; /* adjust to next digit */ | |
188 | u += *cp++ - 'a' + 10; | |
189 | continue; | |
190 | } | |
191 | break; /* terminated */ | |
192 | } | |
193 | ||
194 | if (found) { | |
195 | card->debug_flags = u; /* remember debug flags */ | |
196 | hysdn_addlog(card, "debug set to 0x%lx", card->debug_flags); | |
197 | } | |
198 | return (count); | |
199 | } /* hysdn_log_write */ | |
200 | ||
201 | /******************/ | |
202 | /* read log file */ | |
203 | /******************/ | |
204 | static ssize_t | |
205 | hysdn_log_read(struct file *file, char __user *buf, size_t count, loff_t * off) | |
206 | { | |
207 | struct log_data *inf; | |
208 | int len; | |
209 | struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode); | |
210 | struct procdata *pd = NULL; | |
211 | hysdn_card *card; | |
212 | ||
213 | if (!*((struct log_data **) file->private_data)) { | |
214 | if (file->f_flags & O_NONBLOCK) | |
215 | return (-EAGAIN); | |
216 | ||
217 | /* sorry, but we need to search the card */ | |
218 | card = card_root; | |
219 | while (card) { | |
220 | pd = card->proclog; | |
221 | if (pd->log == pde) | |
222 | break; | |
223 | card = card->next; /* search next entry */ | |
224 | } | |
225 | if (card) | |
226 | interruptible_sleep_on(&(pd->rd_queue)); | |
227 | else | |
228 | return (-EAGAIN); | |
229 | ||
230 | } | |
231 | if (!(inf = *((struct log_data **) file->private_data))) | |
232 | return (0); | |
233 | ||
234 | inf->usage_cnt--; /* new usage count */ | |
235 | file->private_data = &inf->next; /* next structure */ | |
236 | if ((len = strlen(inf->log_start)) <= count) { | |
237 | if (copy_to_user(buf, inf->log_start, len)) | |
238 | return -EFAULT; | |
239 | *off += len; | |
240 | return (len); | |
241 | } | |
242 | return (0); | |
243 | } /* hysdn_log_read */ | |
244 | ||
245 | /******************/ | |
246 | /* open log file */ | |
247 | /******************/ | |
248 | static int | |
249 | hysdn_log_open(struct inode *ino, struct file *filep) | |
250 | { | |
251 | hysdn_card *card; | |
252 | struct procdata *pd = NULL; | |
253 | ulong flags; | |
254 | ||
255 | lock_kernel(); | |
256 | card = card_root; | |
257 | while (card) { | |
258 | pd = card->proclog; | |
259 | if (pd->log == PDE(ino)) | |
260 | break; | |
261 | card = card->next; /* search next entry */ | |
262 | } | |
263 | if (!card) { | |
264 | unlock_kernel(); | |
265 | return (-ENODEV); /* device is unknown/invalid */ | |
266 | } | |
267 | filep->private_data = card; /* remember our own card */ | |
268 | ||
269 | if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { | |
270 | /* write only access -> write log level only */ | |
271 | } else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { | |
272 | ||
273 | /* read access -> log/debug read */ | |
274 | save_flags(flags); | |
275 | cli(); | |
276 | pd->if_used++; | |
277 | if (pd->log_head) | |
278 | filep->private_data = &pd->log_tail->next; | |
279 | else | |
280 | filep->private_data = &pd->log_head; | |
281 | restore_flags(flags); | |
282 | } else { /* simultaneous read/write access forbidden ! */ | |
283 | unlock_kernel(); | |
284 | return (-EPERM); /* no permission this time */ | |
285 | } | |
286 | unlock_kernel(); | |
287 | return nonseekable_open(ino, filep); | |
288 | } /* hysdn_log_open */ | |
289 | ||
290 | /*******************************************************************************/ | |
291 | /* close a cardlog file. If the file has been opened for exclusive write it is */ | |
292 | /* assumed as pof data input and the pof loader is noticed about. */ | |
293 | /* Otherwise file is handled as log output. In this case the interface usage */ | |
294 | /* count is decremented and all buffers are noticed of closing. If this file */ | |
295 | /* was the last one to be closed, all buffers are freed. */ | |
296 | /*******************************************************************************/ | |
297 | static int | |
298 | hysdn_log_close(struct inode *ino, struct file *filep) | |
299 | { | |
300 | struct log_data *inf; | |
301 | struct procdata *pd; | |
302 | hysdn_card *card; | |
303 | int retval = 0; | |
304 | unsigned long flags; | |
305 | ||
306 | ||
307 | lock_kernel(); | |
308 | if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) { | |
309 | /* write only access -> write debug level written */ | |
310 | retval = 0; /* success */ | |
311 | } else { | |
312 | /* read access -> log/debug read, mark one further file as closed */ | |
313 | ||
314 | pd = NULL; | |
315 | save_flags(flags); | |
316 | cli(); | |
317 | inf = *((struct log_data **) filep->private_data); /* get first log entry */ | |
318 | if (inf) | |
319 | pd = (struct procdata *) inf->proc_ctrl; /* still entries there */ | |
320 | else { | |
321 | /* no info available -> search card */ | |
322 | card = card_root; | |
323 | while (card) { | |
324 | pd = card->proclog; | |
325 | if (pd->log == PDE(ino)) | |
326 | break; | |
327 | card = card->next; /* search next entry */ | |
328 | } | |
329 | if (card) | |
330 | pd = card->proclog; /* pointer to procfs log */ | |
331 | } | |
332 | if (pd) | |
333 | pd->if_used--; /* decrement interface usage count by one */ | |
334 | ||
335 | while (inf) { | |
336 | inf->usage_cnt--; /* decrement usage count for buffers */ | |
337 | inf = inf->next; | |
338 | } | |
339 | restore_flags(flags); | |
340 | ||
341 | if (pd) | |
342 | if (pd->if_used <= 0) /* delete buffers if last file closed */ | |
343 | while (pd->log_head) { | |
344 | inf = pd->log_head; | |
345 | pd->log_head = pd->log_head->next; | |
346 | kfree(inf); | |
347 | } | |
348 | } /* read access */ | |
349 | unlock_kernel(); | |
350 | ||
351 | return (retval); | |
352 | } /* hysdn_log_close */ | |
353 | ||
354 | /*************************************************/ | |
355 | /* select/poll routine to be able using select() */ | |
356 | /*************************************************/ | |
357 | static unsigned int | |
358 | hysdn_log_poll(struct file *file, poll_table * wait) | |
359 | { | |
360 | unsigned int mask = 0; | |
361 | struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode); | |
362 | hysdn_card *card; | |
363 | struct procdata *pd = NULL; | |
364 | ||
365 | if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) | |
366 | return (mask); /* no polling for write supported */ | |
367 | ||
368 | /* we need to search the card */ | |
369 | card = card_root; | |
370 | while (card) { | |
371 | pd = card->proclog; | |
372 | if (pd->log == pde) | |
373 | break; | |
374 | card = card->next; /* search next entry */ | |
375 | } | |
376 | if (!card) | |
377 | return (mask); /* card not found */ | |
378 | ||
379 | poll_wait(file, &(pd->rd_queue), wait); | |
380 | ||
381 | if (*((struct log_data **) file->private_data)) | |
382 | mask |= POLLIN | POLLRDNORM; | |
383 | ||
384 | return mask; | |
385 | } /* hysdn_log_poll */ | |
386 | ||
387 | /**************************************************/ | |
388 | /* table for log filesystem functions defined above. */ | |
389 | /**************************************************/ | |
390 | static struct file_operations log_fops = | |
391 | { | |
392 | .llseek = no_llseek, | |
393 | .read = hysdn_log_read, | |
394 | .write = hysdn_log_write, | |
395 | .poll = hysdn_log_poll, | |
396 | .open = hysdn_log_open, | |
397 | .release = hysdn_log_close, | |
398 | }; | |
399 | ||
400 | ||
401 | /***********************************************************************************/ | |
402 | /* hysdn_proclog_init is called when the module is loaded after creating the cards */ | |
403 | /* conf files. */ | |
404 | /***********************************************************************************/ | |
405 | int | |
406 | hysdn_proclog_init(hysdn_card * card) | |
407 | { | |
408 | struct procdata *pd; | |
409 | ||
410 | /* create a cardlog proc entry */ | |
411 | ||
412 | if ((pd = (struct procdata *) kmalloc(sizeof(struct procdata), GFP_KERNEL)) != NULL) { | |
413 | memset(pd, 0, sizeof(struct procdata)); | |
414 | sprintf(pd->log_name, "%s%d", PROC_LOG_BASENAME, card->myid); | |
415 | if ((pd->log = create_proc_entry(pd->log_name, S_IFREG | S_IRUGO | S_IWUSR, hysdn_proc_entry)) != NULL) { | |
416 | pd->log->proc_fops = &log_fops; | |
417 | pd->log->owner = THIS_MODULE; | |
418 | } | |
419 | ||
420 | init_waitqueue_head(&(pd->rd_queue)); | |
421 | ||
422 | card->proclog = (void *) pd; /* remember procfs structure */ | |
423 | } | |
424 | return (0); | |
425 | } /* hysdn_proclog_init */ | |
426 | ||
427 | /************************************************************************************/ | |
428 | /* hysdn_proclog_release is called when the module is unloaded and before the cards */ | |
429 | /* conf file is released */ | |
430 | /* The module counter is assumed to be 0 ! */ | |
431 | /************************************************************************************/ | |
432 | void | |
433 | hysdn_proclog_release(hysdn_card * card) | |
434 | { | |
435 | struct procdata *pd; | |
436 | ||
437 | if ((pd = (struct procdata *) card->proclog) != NULL) { | |
438 | if (pd->log) | |
439 | remove_proc_entry(pd->log_name, hysdn_proc_entry); | |
440 | kfree(pd); /* release memory */ | |
441 | card->proclog = NULL; | |
442 | } | |
443 | } /* hysdn_proclog_release */ |