summaryrefslogtreecommitdiff
path: root/drivers/isdn/hysdn/hysdn_procconf.c
blob: 639582f61f41e416e98dbb493a70a9a3d1f7df15 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
/* $Id: hysdn_procconf.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
 *
 * Linux driver for HYSDN cards, /proc/net filesystem dir and conf functions.
 *
 * written by Werner Cornelius (werner@titro.de) for Hypercope GmbH
 *
 * Copyright 1999  by Werner Cornelius (werner@titro.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>

#include "hysdn_defs.h"

static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";

#define INFO_OUT_LEN 80		/* length of info line including lf */

/********************************************************/
/* defines and data structure for conf write operations */
/********************************************************/
#define CONF_STATE_DETECT 0	/* waiting for detect */
#define CONF_STATE_CONF   1	/* writing config data */
#define CONF_STATE_POF    2	/* writing pof data */
#define CONF_LINE_LEN   255	/* 255 chars max */

struct conf_writedata {
	hysdn_card *card;	/* card the device is connected to */
	int buf_size;		/* actual number of bytes in the buffer */
	int needed_size;	/* needed size when reading pof */
	int state;		/* actual interface states from above constants */
	uchar conf_line[CONF_LINE_LEN];		/* buffered conf line */
	word channel;		/* active channel number */
	uchar *pof_buffer;	/* buffer when writing pof */
};

/***********************************************************************/
/* process_line parses one config line and transfers it to the card if */
/* necessary.                                                          */
/* if the return value is negative an error occurred.                   */
/***********************************************************************/
static int
process_line(struct conf_writedata *cnf)
{
	uchar *cp = cnf->conf_line;
	int i;

	if (cnf->card->debug_flags & LOG_CNF_LINE)
		hysdn_addlog(cnf->card, "conf line: %s", cp);

	if (*cp == '-') {	/* option */
		cp++;		/* point to option char */

		if (*cp++ != 'c')
			return (0);	/* option unknown or used */
		i = 0;		/* start value for channel */
		while ((*cp <= '9') && (*cp >= '0'))
			i = i * 10 + *cp++ - '0';	/* get decimal number */
		if (i > 65535) {
			if (cnf->card->debug_flags & LOG_CNF_MISC)
				hysdn_addlog(cnf->card, "conf channel invalid  %d", i);
			return (-ERR_INV_CHAN);		/* invalid channel */
		}
		cnf->channel = i & 0xFFFF;	/* set new channel number */
		return (0);	/* success */
	}			/* option */
	if (*cp == '*') {	/* line to send */
		if (cnf->card->debug_flags & LOG_CNF_DATA)
			hysdn_addlog(cnf->card, "conf chan=%d %s", cnf->channel, cp);
		return (hysdn_tx_cfgline(cnf->card, cnf->conf_line + 1,
					 cnf->channel));	/* send the line without * */
	}			/* line to send */
	return (0);
}				/* process_line */

/***********************************/
/* conf file operations and tables */
/***********************************/

/****************************************************/
/* write conf file -> boot or send cfg line to card */
/****************************************************/
static ssize_t
hysdn_conf_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
{
	struct conf_writedata *cnf;
	int i;
	uchar ch, *cp;

	if (!count)
		return (0);	/* nothing to handle */

	if (!(cnf = file->private_data))
		return (-EFAULT);	/* should never happen */

	if (cnf->state == CONF_STATE_DETECT) {	/* auto detect cnf or pof data */
		if (copy_from_user(&ch, buf, 1))	/* get first char for detect */
			return (-EFAULT);

		if (ch == 0x1A) {
			/* we detected a pof file */
			if ((cnf->needed_size = pof_write_open(cnf->card, &cnf->pof_buffer)) <= 0)
				return (cnf->needed_size);	/* an error occurred -> exit */
			cnf->buf_size = 0;	/* buffer is empty */
			cnf->state = CONF_STATE_POF;	/* new state */
		} else {
			/* conf data has been detected */
			cnf->buf_size = 0;	/* buffer is empty */
			cnf->state = CONF_STATE_CONF;	/* requested conf data write */
			if (cnf->card->state != CARD_STATE_RUN)
				return (-ERR_NOT_BOOTED);
			cnf->conf_line[CONF_LINE_LEN - 1] = 0;	/* limit string length */
			cnf->channel = 4098;	/* default channel for output */
		}
	}			/* state was auto detect */
	if (cnf->state == CONF_STATE_POF) {	/* pof write active */
		i = cnf->needed_size - cnf->buf_size;	/* bytes still missing for write */
		if (i <= 0)
			return (-EINVAL);	/* size error handling pof */

		if (i < count)
			count = i;	/* limit requested number of bytes */
		if (copy_from_user(cnf->pof_buffer + cnf->buf_size, buf, count))
			return (-EFAULT);	/* error while copying */
		cnf->buf_size += count;

		if (cnf->needed_size == cnf->buf_size) {
			cnf->needed_size = pof_write_buffer(cnf->card, cnf->buf_size);	/* write data */
			if (cnf->needed_size <= 0) {
				cnf->card->state = CARD_STATE_BOOTERR;	/* show boot error */
				return (cnf->needed_size);	/* an error occurred */
			}
			cnf->buf_size = 0;	/* buffer is empty again */
		}
	}
	/* pof write active */
	else {			/* conf write active */

		if (cnf->card->state != CARD_STATE_RUN) {
			if (cnf->card->debug_flags & LOG_CNF_MISC)
				hysdn_addlog(cnf->card, "cnf write denied -> not booted");
			return (-ERR_NOT_BOOTED);
		}
		i = (CONF_LINE_LEN - 1) - cnf->buf_size;	/* bytes available in buffer */
		if (i > 0) {
			/* copy remaining bytes into buffer */

			if (count > i)
				count = i;	/* limit transfer */
			if (copy_from_user(cnf->conf_line + cnf->buf_size, buf, count))
				return (-EFAULT);	/* error while copying */

			i = count;	/* number of chars in buffer */
			cp = cnf->conf_line + cnf->buf_size;
			while (i) {
				/* search for end of line */
				if ((*cp < ' ') && (*cp != 9))
					break;	/* end of line found */
				cp++;
				i--;
			}	/* search for end of line */

			if (i) {
				/* delimiter found */
				*cp++ = 0;	/* string termination */
				count -= (i - 1);	/* subtract remaining bytes from count */
				while ((i) && (*cp < ' ') && (*cp != 9)) {
					i--;	/* discard next char */
					count++;	/* mark as read */
					cp++;	/* next char */
				}
				cnf->buf_size = 0;	/* buffer is empty after transfer */
				if ((i = process_line(cnf)) < 0)	/* handle the line */
					count = i;	/* return the error */
			}
			/* delimiter found */
			else {
				cnf->buf_size += count;		/* add chars to string */
				if (cnf->buf_size >= CONF_LINE_LEN - 1) {
					if (cnf->card->debug_flags & LOG_CNF_MISC)
						hysdn_addlog(cnf->card, "cnf line too long %d chars pos %d", cnf->buf_size, count);
					return (-ERR_CONF_LONG);
				}
			}	/* not delimited */

		}
		/* copy remaining bytes into buffer */
		else {
			if (cnf->card->debug_flags & LOG_CNF_MISC)
				hysdn_addlog(cnf->card, "cnf line too long");
			return (-ERR_CONF_LONG);
		}
	}			/* conf write active */

	return (count);
}				/* hysdn_conf_write */

/*******************************************/
/* read conf file -> output card info data */
/*******************************************/
static ssize_t
hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t * off)
{
	char *cp;
	int i;

	if (file->f_mode & FMODE_READ) {
		if (!(cp = file->private_data))
			return (-EFAULT);	/* should never happen */
		i = strlen(cp);	/* get total string length */
		if (*off < i) {
			/* still bytes to transfer */
			cp += *off;	/* point to desired data offset */
			i -= *off;	/* remaining length */
			if (i > count)
				i = count;	/* limit length to transfer */
			if (copy_to_user(buf, cp, i))
				return (-EFAULT);	/* copy error */
			*off += i;	/* adjust offset */
		} else
			return (0);
	} else
		return (-EPERM);	/* no permission to read */

	return (i);
}				/* hysdn_conf_read */

/******************/
/* open conf file */
/******************/
static int
hysdn_conf_open(struct inode *ino, struct file *filep)
{
	hysdn_card *card;
	struct proc_dir_entry *pd;
	struct conf_writedata *cnf;
	char *cp, *tmp;

	/* now search the addressed card */
	lock_kernel();
	card = card_root;
	while (card) {
		pd = card->procconf;
		if (pd == PDE(ino))
			break;
		card = card->next;	/* search next entry */
	}
	if (!card) {
		unlock_kernel();
		return (-ENODEV);	/* device is unknown/invalid */
	}
	if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
		hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
			     filep->f_uid, filep->f_gid, filep->f_mode);

	if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
		/* write only access -> write boot file or conf line */

		if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
			unlock_kernel();
			return (-EFAULT);
		}
		cnf->card = card;
		cnf->buf_size = 0;	/* nothing buffered */
		cnf->state = CONF_STATE_DETECT;		/* start auto detect */
		filep->private_data = cnf;

	} else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
		/* read access -> output card info data */

		if (!(tmp = (char *) kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
			unlock_kernel();
			return (-EFAULT);	/* out of memory */
		}
		filep->private_data = tmp;	/* start of string */

		/* first output a headline */
		sprintf(tmp, "id bus slot type irq iobase dp-mem     b-chans fax-chans state device");
		cp = tmp;	/* start of string */
		while (*cp)
			cp++;
		while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
			*cp++ = ' ';
		*cp++ = '\n';

		/* and now the data */
		sprintf(cp, "%d  %3d %4d %4d %3d 0x%04x 0x%08lx %7d %9d %3d   %s",
			card->myid,
			card->bus,
			PCI_SLOT(card->devfn),
			card->brdtype,
			card->irq,
			card->iobase,
			card->membase,
			card->bchans,
			card->faxchans,
			card->state,
			hysdn_net_getname(card));
		while (*cp)
			cp++;
		while (((cp - tmp) % (INFO_OUT_LEN + 1)) != INFO_OUT_LEN)
			*cp++ = ' ';
		*cp++ = '\n';
		*cp = 0;	/* end of string */
	} else {		/* simultaneous read/write access forbidden ! */
		unlock_kernel();
		return (-EPERM);	/* no permission this time */
	}
	unlock_kernel();
	return nonseekable_open(ino, filep);
}				/* hysdn_conf_open */

/***************************/
/* close a config file.    */
/***************************/
static int
hysdn_conf_close(struct inode *ino, struct file *filep)
{
	hysdn_card *card;
	struct conf_writedata *cnf;
	int retval = 0;
	struct proc_dir_entry *pd;

	lock_kernel();
	/* search the addressed card */
	card = card_root;
	while (card) {
		pd = card->procconf;
		if (pd == PDE(ino))
			break;
		card = card->next;	/* search next entry */
	}
	if (!card) {
		unlock_kernel();
		return (-ENODEV);	/* device is unknown/invalid */
	}
	if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
		hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
			     filep->f_uid, filep->f_gid, filep->f_mode);

	if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
		/* write only access -> write boot file or conf line */
		if (filep->private_data) {
			cnf = filep->private_data;

			if (cnf->state == CONF_STATE_POF)
				retval = pof_write_close(cnf->card);	/* close the pof write */
			kfree(filep->private_data);	/* free allocated memory for buffer */

		}		/* handle write private data */
	} else if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
		/* read access -> output card info data */

		if (filep->private_data)
			kfree(filep->private_data);	/* release memory */
	}
	unlock_kernel();
	return (retval);
}				/* hysdn_conf_close */

/******************************************************/
/* table for conf filesystem functions defined above. */
/******************************************************/
static struct file_operations conf_fops =
{
	.llseek         = no_llseek,
	.read           = hysdn_conf_read,
	.write          = hysdn_conf_write,
	.open           = hysdn_conf_open,
	.release        = hysdn_conf_close,                                       
};

/*****************************/
/* hysdn subdir in /proc/net */
/*****************************/
struct proc_dir_entry *hysdn_proc_entry = NULL;

/*******************************************************************************/
/* hysdn_procconf_init is called when the module is loaded and after the cards */
/* have been detected. The needed proc dir and card config files are created.  */
/* The log init is called at last.                                             */
/*******************************************************************************/
int
hysdn_procconf_init(void)
{
	hysdn_card *card;
	uchar conf_name[20];

	hysdn_proc_entry = proc_mkdir(PROC_SUBDIR_NAME, proc_net);
	if (!hysdn_proc_entry) {
		printk(KERN_ERR "HYSDN: unable to create hysdn subdir\n");
		return (-1);
	}
	card = card_root;	/* point to first card */
	while (card) {

		sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
		if ((card->procconf = (void *) create_proc_entry(conf_name,
					     S_IFREG | S_IRUGO | S_IWUSR,
					    hysdn_proc_entry)) != NULL) {
			((struct proc_dir_entry *) card->procconf)->proc_fops = &conf_fops;
			((struct proc_dir_entry *) card->procconf)->owner = THIS_MODULE;
			hysdn_proclog_init(card);	/* init the log file entry */
		}
		card = card->next;	/* next entry */
	}

	printk(KERN_NOTICE "HYSDN: procfs Rev. %s initialised\n", hysdn_getrev(hysdn_procconf_revision));
	return (0);
}				/* hysdn_procconf_init */

/*************************************************************************************/
/* hysdn_procconf_release is called when the module is unloaded and before the cards */
/* resources are released. The module counter is assumed to be 0 !                   */
/*************************************************************************************/
void
hysdn_procconf_release(void)
{
	hysdn_card *card;
	uchar conf_name[20];

	card = card_root;	/* start with first card */
	while (card) {

		sprintf(conf_name, "%s%d", PROC_CONF_BASENAME, card->myid);
		if (card->procconf)
			remove_proc_entry(conf_name, hysdn_proc_entry);

		hysdn_proclog_release(card);	/* init the log file entry */

		card = card->next;	/* point to next card */
	}

	remove_proc_entry(PROC_SUBDIR_NAME, proc_net);
}