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kernel-ark/drivers/isdn/hysdn/hysdn_procconf.c
Arjan van de Ven 2b8693c061 [PATCH] mark struct file_operations const 3 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

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/* $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/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 */
unsigned char conf_line[CONF_LINE_LEN]; /* buffered conf line */
unsigned short channel; /* active channel number */
unsigned char *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)
{
unsigned char *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;
unsigned char 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 = 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 */
kfree(filep->private_data); /* release memory */
}
unlock_kernel();
return (retval);
} /* hysdn_conf_close */
/******************************************************/
/* table for conf filesystem functions defined above. */
/******************************************************/
static const 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;
unsigned char 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;
unsigned char 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);
}
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