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 class_device *class, char *buf)
  20 {
  21         int ret;
  22         unsigned long flags;
  23         struct cardstate *cs = class_get_devdata(class);
  24
  25         spin_lock_irqsave(&cs->lock, flags);
  26         ret = sprintf(buf, "%u\n", cs->cidmode);
  27         spin_unlock_irqrestore(&cs->lock, flags);
  28
  29         return ret;
  30 }
  31
  32 static ssize_t set_cidmode(struct class_device *class,
  33                            const char *buf, size_t count)
  34 {
  35         struct cardstate *cs = class_get_devdata(class);
  36         long int value;
  37         char *end;
  38
  39         value = simple_strtol(buf, &end, 0);
  40         while (*end)
  41                 if (!isspace(*end++))
  42                         return -EINVAL;
  43         if (value < 0 || value > 1)
  44                         return -EINVAL;
  45
  46         if (mutex_lock_interruptible(&cs->mutex))
  47                 return -ERESTARTSYS; // FIXME -EINTR?
  48
  49         cs->waiting = 1;
  50         if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
  51                                NULL, value, NULL)) {
  52                 cs->waiting = 0;
  53                 mutex_unlock(&cs->mutex);
  54                 return -ENOMEM;
  55         }
  56
  57         gig_dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
  58         gigaset_schedule_event(cs);
  59
  60         wait_event(cs->waitqueue, !cs->waiting);
  61
  62         mutex_unlock(&cs->mutex);
  63
  64         return count;
  65 }
  66
  67 static CLASS_DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
  68
  69 /* free sysfs for device */
  70 void gigaset_free_dev_sysfs(struct cardstate *cs)
  71 {
  72         if (!cs->class)
  73                 return;
  74
  75         gig_dbg(DEBUG_INIT, "removing sysfs entries");
  76         class_device_remove_file(cs->class, &class_device_attr_cidmode);
  77 }
  78
  79 /* initialize sysfs for device */
  80 void gigaset_init_dev_sysfs(struct cardstate *cs)
  81 {
  82         if (!cs->class)
  83                 return;
  84
  85         gig_dbg(DEBUG_INIT, "setting up sysfs");
  86         if (class_device_create_file(cs->class, &class_device_attr_cidmode))
  87                 dev_err(cs->dev, "could not create sysfs attribute\n");
  88 }