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, struct device_attribute *attr,
  20                             char *buf)
  21 {
  22         int ret;
  23         unsigned long flags;
  24         struct cardstate *cs = dev_get_drvdata(dev);
  25
  26         spin_lock_irqsave(&cs->lock, flags);
  27         ret = sprintf(buf, "%u\n", cs->cidmode);
  28         spin_unlock_irqrestore(&cs->lock, flags);
  29
  30         return ret;
  31 }
  32
  33 static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
  34                            const char *buf, size_t count)
  35 {
  36         struct cardstate *cs = dev_get_drvdata(dev);
  37         long int value;
  38         char *end;
  39
  40         value = simple_strtol(buf, &end, 0);
  41         while (*end)
  42                 if (!isspace(*end++))
  43                         return -EINVAL;
  44         if (value < 0 || value > 1)
  45                         return -EINVAL;
  46
  47         if (mutex_lock_interruptible(&cs->mutex))
  48                 return -ERESTARTSYS; // FIXME -EINTR?
  49
  50         cs->waiting = 1;
  51         if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
  52                                NULL, value, NULL)) {
  53                 cs->waiting = 0;
  54                 mutex_unlock(&cs->mutex);
  55                 return -ENOMEM;
  56         }
  57
  58         gig_dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
  59         gigaset_schedule_event(cs);
  60
  61         wait_event(cs->waitqueue, !cs->waiting);
  62
  63         mutex_unlock(&cs->mutex);
  64
  65         return count;
  66 }
  67
  68 static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
  69
  70 /* free sysfs for device */
  71 void gigaset_free_dev_sysfs(struct cardstate *cs)
  72 {
  73         gig_dbg(DEBUG_INIT, "removing sysfs entries");
  74         device_remove_file(cs->dev, &dev_attr_cidmode);
  75 }
  76
  77 /* initialize sysfs for device */
  78 void gigaset_init_dev_sysfs(struct cardstate *cs)
  79 {
  80         gig_dbg(DEBUG_INIT, "setting up sysfs");
  81         device_create_file(cs->dev, &dev_attr_cidmode);
  82 }