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