drivers/isdn/gigaset/proc.c

   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 #include <linux/ctype.h>
  18
  19 static ssize_t show_cidmode(struct device *dev,
  20                             struct device_attribute *attr, char *buf)
  21 {
  22         struct cardstate *cs = dev_get_drvdata(dev);
  23
  24         return sprintf(buf, "%u\n", cs->cidmode);
  25 }
  26
  27 static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
  28                            const char *buf, size_t count)
  29 {
  30         struct cardstate *cs = dev_get_drvdata(dev);
  31         long int value;
  32         char *end;
  33
  34         value = simple_strtol(buf, &end, 0);
  35         while (*end)
  36                 if (!isspace(*end++))
  37                         return -EINVAL;
  38         if (value < 0 || value > 1)
  39                         return -EINVAL;
  40
  41         if (mutex_lock_interruptible(&cs->mutex))
  42                 return -ERESTARTSYS; // FIXME -EINTR?
  43
  44         cs->waiting = 1;
  45         if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
  46                                NULL, value, NULL)) {
  47                 cs->waiting = 0;
  48                 mutex_unlock(&cs->mutex);
  49                 return -ENOMEM;
  50         }
  51
  52         gig_dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
  53         gigaset_schedule_event(cs);
  54
  55         wait_event(cs->waitqueue, !cs->waiting);
  56
  57         mutex_unlock(&cs->mutex);
  58
  59         return count;
  60 }
  61
  62 static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
  63
  64 /* free sysfs for device */
  65 void gigaset_free_dev_sysfs(struct cardstate *cs)
  66 {
  67         if (!cs->tty_dev)
  68                 return;
  69
  70         gig_dbg(DEBUG_INIT, "removing sysfs entries");
  71         device_remove_file(cs->tty_dev, &dev_attr_cidmode);
  72 }
  73
  74 /* initialize sysfs for device */
  75 void gigaset_init_dev_sysfs(struct cardstate *cs)
  76 {
  77         if (!cs->tty_dev)
  78                 return;
  79
  80         gig_dbg(DEBUG_INIT, "setting up sysfs");
  81         if (device_create_file(cs->tty_dev, &dev_attr_cidmode))
  82                 pr_err("could not create sysfs attribute\n");
  83 }