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
  18 static 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
  26 static 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
  59 static DEVICE_ATTR(cidmode, S_IRUGO | S_IWUSR, show_cidmode, set_cidmode);
  60
  61 /* free sysfs for device */
  62 void 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 */
  72 void 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 }