linux/drivers/isdn/gigaset/proc.c
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   1/*
   2 * Stuff used by all variants of the driver
   3 *
   4 * Copyright (c) 2001 by Stefan Eilers,
   5 *                       Hansjoerg Lipp <hjlipp@web.de>,
   6 *                       Tilman Schmidt <tilman@imap.cc>.
   7 *
   8 * =====================================================================
   9 *      This program is free software; you can redistribute it and/or
  10 *      modify it under the terms of the GNU General Public License as
  11 *      published by the Free Software Foundation; either version 2 of
  12 *      the License, or (at your option) any later version.
  13 * =====================================================================
  14 */
  15
  16#include "gigaset.h"
  17
  18static ssize_t show_cidmode(struct device *dev,
  19                            struct device_attribute *attr, char *buf)
  20{
  21        struct cardstate *cs = dev_get_drvdata(dev);
  22
  23        return sprintf(buf, "%u\n", cs->cidmode);
  24}
  25
  26static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
  27                           const char *buf, size_t count)
  28{
  29        struct cardstate *cs = dev_get_drvdata(dev);
  30        long int value;
  31        char *end;
  32
  33        value = simple_strtol(buf, &end, 0);
  34        while (*end)
  35                if (!isspace(*end++))
  36                        return -EINVAL;
  37        if (value < 0 || value > 1)
  38                        return -EINVAL;
  39
  40        if (mutex_lock_interruptible(&cs->mutex))
  41                return -ERESTARTSYS;
  42
  43        cs->waiting = 1;
  44        if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
  45                               NULL, value, NULL)) {
  46                cs->waiting = 0;
  47                mutex_unlock(&cs->mutex);
  48                return -ENOMEM;
  49        }
  50        gigaset_schedule_event(cs);
  51
  52        wait_event(cs->waitqueue, !cs->waiting);
  53
  54        mutex_unlock(&cs->mutex);
  55
  56        return count;
  57}
  58
  59static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
  60
  61/* free sysfs for device */
  62void gigaset_free_dev_sysfs(struct cardstate *cs)
  63{
  64        if (!cs->tty_dev)
  65                return;
  66
  67        gig_dbg(DEBUG_INIT, "removing sysfs entries");
  68        device_remove_file(cs->tty_dev, &dev_attr_cidmode);
  69}
  70
  71/* initialize sysfs for device */
  72void gigaset_init_dev_sysfs(struct cardstate *cs)
  73{
  74        if (!cs->tty_dev)
  75                return;
  76
  77        gig_dbg(DEBUG_INIT, "setting up sysfs");
  78        if (device_create_file(cs->tty_dev, &dev_attr_cidmode))
  79                pr_err("could not create sysfs attribute\n");
  80}
  81