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sysctl.c

/*
 * Thomas Horsten <thh@lasat.com>
 * Copyright (C) 2000 LASAT Networks A/S.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Routines specific to the LASAT boards
 */
#include <linux/types.h>
#include <asm/lasat/lasat.h>

#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>

#include <asm/time.h>

#include "sysctl.h"
#include "ds1603.h"

static DEFINE_MUTEX(lasat_info_mutex);

/* Strategy function to write EEPROM after changing string entry */
int sysctl_lasatstring(ctl_table *table, int *name, int nlen,
            void *oldval, size_t *oldlenp,
            void *newval, size_t newlen)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = sysctl_string(table, name,
                    nlen, oldval, oldlenp, newval, newlen);
      if (r < 0) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      if (newval && newlen)
            lasat_write_eeprom_info();
      mutex_unlock(&lasat_info_mutex);

      return 1;
}


/* And the same for proc */
int proc_dolasatstring(ctl_table *table, int write, struct file *filp,
                   void *buffer, size_t *lenp, loff_t *ppos)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = proc_dostring(table, write, filp, buffer, lenp, ppos);
      if ((!write) || r) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      lasat_write_eeprom_info();
      mutex_unlock(&lasat_info_mutex);

      return 0;
}

/* proc function to write EEPROM after changing int entry */
int proc_dolasatint(ctl_table *table, int write, struct file *filp,
                   void *buffer, size_t *lenp, loff_t *ppos)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = proc_dointvec(table, write, filp, buffer, lenp, ppos);
      if ((!write) || r) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      lasat_write_eeprom_info();
      mutex_unlock(&lasat_info_mutex);

      return 0;
}

static int rtctmp;

#ifdef CONFIG_DS1603
/* proc function to read/write RealTime Clock */
int proc_dolasatrtc(ctl_table *table, int write, struct file *filp,
                   void *buffer, size_t *lenp, loff_t *ppos)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      if (!write) {
            rtctmp = read_persistent_clock();
            /* check for time < 0 and set to 0 */
            if (rtctmp < 0)
                  rtctmp = 0;
      }
      r = proc_dointvec(table, write, filp, buffer, lenp, ppos);
      if ((!write) || r) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      rtc_mips_set_mmss(rtctmp);
      mutex_unlock(&lasat_info_mutex);

      return 0;
}
#endif

/* Sysctl for setting the IP addresses */
int sysctl_lasat_intvec(ctl_table *table, int *name, int nlen,
                void *oldval, size_t *oldlenp,
                void *newval, size_t newlen)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
      if (r < 0) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      if (newval && newlen)
            lasat_write_eeprom_info();
      mutex_unlock(&lasat_info_mutex);

      return 1;
}

#ifdef CONFIG_DS1603
/* Same for RTC */
int sysctl_lasat_rtc(ctl_table *table, int *name, int nlen,
                void *oldval, size_t *oldlenp,
                void *newval, size_t newlen)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      rtctmp = read_persistent_clock();
      if (rtctmp < 0)
            rtctmp = 0;
      r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
      if (r < 0) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      if (newval && newlen)
            rtc_mips_set_mmss(rtctmp);
      mutex_unlock(&lasat_info_mutex);

      return 1;
}
#endif

#ifdef CONFIG_INET
static char lasat_bcastaddr[16];

void update_bcastaddr(void)
{
      unsigned int ip;

      ip = (lasat_board_info.li_eeprom_info.ipaddr &
            lasat_board_info.li_eeprom_info.netmask) |
            ~lasat_board_info.li_eeprom_info.netmask;

      sprintf(lasat_bcastaddr, "%d.%d.%d.%d",
                  (ip)       & 0xff,
                  (ip >>  8) & 0xff,
                  (ip >> 16) & 0xff,
                  (ip >> 24) & 0xff);
}

static char proc_lasat_ipbuf[32];

/* Parsing of IP address */
int proc_lasat_ip(ctl_table *table, int write, struct file *filp,
                   void *buffer, size_t *lenp, loff_t *ppos)
{
      unsigned int ip;
      char *p, c;
      int len;

      if (!table->data || !table->maxlen || !*lenp ||
          (*ppos && !write)) {
            *lenp = 0;
            return 0;
      }

      mutex_lock(&lasat_info_mutex);
      if (write) {
            len = 0;
            p = buffer;
            while (len < *lenp) {
                  if (get_user(c, p++)) {
                        mutex_unlock(&lasat_info_mutex);
                        return -EFAULT;
                  }
                  if (c == 0 || c == '\n')
                        break;
                  len++;
            }
            if (len >= sizeof(proc_lasat_ipbuf)-1)
                  len = sizeof(proc_lasat_ipbuf) - 1;
            if (copy_from_user(proc_lasat_ipbuf, buffer, len)) {
                  mutex_unlock(&lasat_info_mutex);
                  return -EFAULT;
            }
            proc_lasat_ipbuf[len] = 0;
            *ppos += *lenp;
            /* Now see if we can convert it to a valid IP */
            ip = in_aton(proc_lasat_ipbuf);
            *(unsigned int *)(table->data) = ip;
            lasat_write_eeprom_info();
      } else {
            ip = *(unsigned int *)(table->data);
            sprintf(proc_lasat_ipbuf, "%d.%d.%d.%d",
                  (ip)       & 0xff,
                  (ip >>  8) & 0xff,
                  (ip >> 16) & 0xff,
                  (ip >> 24) & 0xff);
            len = strlen(proc_lasat_ipbuf);
            if (len > *lenp)
                  len = *lenp;
            if (len)
                  if (copy_to_user(buffer, proc_lasat_ipbuf, len)) {
                        mutex_unlock(&lasat_info_mutex);
                        return -EFAULT;
                  }
            if (len < *lenp) {
                  if (put_user('\n', ((char *) buffer) + len)) {
                        mutex_unlock(&lasat_info_mutex);
                        return -EFAULT;
                  }
                  len++;
            }
            *lenp = len;
            *ppos += len;
      }
      update_bcastaddr();
      mutex_unlock(&lasat_info_mutex);

      return 0;
}
#endif /* defined(CONFIG_INET) */

static int sysctl_lasat_eeprom_value(ctl_table *table, int *name, int nlen,
                             void *oldval, size_t *oldlenp,
                             void *newval, size_t newlen)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = sysctl_intvec(table, name, nlen, oldval, oldlenp, newval, newlen);
      if (r < 0) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }

      if (newval && newlen) {
            if (name && *name == LASAT_PRID)
                  lasat_board_info.li_eeprom_info.prid = *(int *)newval;

            lasat_write_eeprom_info();
            lasat_init_board_info();
      }
      mutex_unlock(&lasat_info_mutex);

      return 0;
}

int proc_lasat_eeprom_value(ctl_table *table, int write, struct file *filp,
                   void *buffer, size_t *lenp, loff_t *ppos)
{
      int r;

      mutex_lock(&lasat_info_mutex);
      r = proc_dointvec(table, write, filp, buffer, lenp, ppos);
      if ((!write) || r) {
            mutex_unlock(&lasat_info_mutex);
            return r;
      }
      if (filp && filp->f_path.dentry) {
            if (!strcmp(filp->f_path.dentry->d_name.name, "prid"))
                  lasat_board_info.li_eeprom_info.prid =
                        lasat_board_info.li_prid;
            if (!strcmp(filp->f_path.dentry->d_name.name, "debugaccess"))
                  lasat_board_info.li_eeprom_info.debugaccess =
                        lasat_board_info.li_debugaccess;
      }
      lasat_write_eeprom_info();
      mutex_unlock(&lasat_info_mutex);

      return 0;
}

extern int lasat_boot_to_service;

#ifdef CONFIG_SYSCTL

static ctl_table lasat_table[] = {
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "cpu-hz",
            .data       = &lasat_board_info.li_cpu_hz,
            .maxlen           = sizeof(int),
            .mode       = 0444,
            .proc_handler     = &proc_dointvec,
            .strategy   = &sysctl_intvec
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "bus-hz",
            .data       = &lasat_board_info.li_bus_hz,
            .maxlen           = sizeof(int),
            .mode       = 0444,
            .proc_handler     = &proc_dointvec,
            .strategy   = &sysctl_intvec
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "bmid",
            .data       = &lasat_board_info.li_bmid,
            .maxlen           = sizeof(int),
            .mode       = 0444,
            .proc_handler     = &proc_dointvec,
            .strategy   = &sysctl_intvec
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "prid",
            .data       = &lasat_board_info.li_prid,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_lasat_eeprom_value,
            .strategy   = &sysctl_lasat_eeprom_value
      },
#ifdef CONFIG_INET
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "ipaddr",
            .data       = &lasat_board_info.li_eeprom_info.ipaddr,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_lasat_ip,
            .strategy   = &sysctl_lasat_intvec
      },
      {
            .ctl_name   = LASAT_NETMASK,
            .procname   = "netmask",
            .data       = &lasat_board_info.li_eeprom_info.netmask,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_lasat_ip,
            .strategy   = &sysctl_lasat_intvec
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "bcastaddr",
            .data       = &lasat_bcastaddr,
            .maxlen           = sizeof(lasat_bcastaddr),
            .mode       = 0600,
            .proc_handler     = &proc_dostring,
            .strategy   = &sysctl_string
      },
#endif
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "passwd_hash",
            .data       = &lasat_board_info.li_eeprom_info.passwd_hash,
            .maxlen           =
                  sizeof(lasat_board_info.li_eeprom_info.passwd_hash),
            .mode       = 0600,
            .proc_handler     = &proc_dolasatstring,
            .strategy   = &sysctl_lasatstring
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "boot-service",
            .data       = &lasat_boot_to_service,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_dointvec,
            .strategy   = &sysctl_intvec
      },
#ifdef CONFIG_DS1603
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "rtc",
            .data       = &rtctmp,
            .maxlen           = sizeof(int),
            .mode       = 0644,
            .proc_handler     = &proc_dolasatrtc,
            .strategy   = &sysctl_lasat_rtc
      },
#endif
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "namestr",
            .data       = &lasat_board_info.li_namestr,
            .maxlen           = sizeof(lasat_board_info.li_namestr),
            .mode       = 0444,
            .proc_handler     =  &proc_dostring,
            .strategy   = &sysctl_string
      },
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "typestr",
            .data       = &lasat_board_info.li_typestr,
            .maxlen           = sizeof(lasat_board_info.li_typestr),
            .mode       = 0444,
            .proc_handler     = &proc_dostring,
            .strategy   = &sysctl_string
      },
      {}
};

static ctl_table lasat_root_table[] = {
      {
            .ctl_name   = CTL_UNNUMBERED,
            .procname   = "lasat",
            .mode       =  0555,
            .child            = lasat_table
      },
      {}
};

static int __init lasat_register_sysctl(void)
{
      struct ctl_table_header *lasat_table_header;

      lasat_table_header =
            register_sysctl_table(lasat_root_table);

      return 0;
}

__initcall(lasat_register_sysctl);
#endif /* CONFIG_SYSCTL */

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