drivers/isdn/gigaset/proc.c

   1 /*
   2  * Stuff used by all variants of the driver
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers <Eilers.Stefan@epost.de>,
   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         struct usb_interface *intf = to_usb_interface(dev);
  23         struct cardstate *cs = usb_get_intfdata(intf);
  24         return sprintf(buf, "%d\n", atomic_read(&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 usb_interface *intf = to_usb_interface(dev);
  31         struct cardstate *cs = usb_get_intfdata(intf);
  32         long int value;
  33         char *end;
  34
  35         value = simple_strtol(buf, &end, 0);
  36         while (*end)
  37                 if (!isspace(*end++))
  38                         return -EINVAL;
  39         if (value < 0 || value > 1)
  40                         return -EINVAL;
  41
  42         if (down_interruptible(&cs->sem))
  43                 return -ERESTARTSYS; // FIXME -EINTR?
  44
  45         cs->waiting = 1;
  46         if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
  47                                NULL, value, NULL)) {
  48                 cs->waiting = 0;
  49                 up(&cs->sem);
  50                 return -ENOMEM;
  51         }
  52
  53         gig_dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
  54         gigaset_schedule_event(cs);
  55
  56         wait_event(cs->waitqueue, !cs->waiting);
  57
  58         up(&cs->sem);
  59
  60         return count;
  61 }
  62
  63 static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
  64
  65 /* free sysfs for device */
  66 void gigaset_free_dev_sysfs(struct usb_interface *interface)
  67 {
  68         gig_dbg(DEBUG_INIT, "removing sysfs entries");
  69         device_remove_file(&interface->dev, &dev_attr_cidmode);
  70 }
  71 EXPORT_SYMBOL_GPL(gigaset_free_dev_sysfs);
  72
  73 /* initialize sysfs for device */
  74 void gigaset_init_dev_sysfs(struct usb_interface *interface)
  75 {
  76         gig_dbg(DEBUG_INIT, "setting up sysfs");
  77         device_create_file(&interface->dev, &dev_attr_cidmode);
  78 }
  79 EXPORT_SYMBOL_GPL(gigaset_init_dev_sysfs);