drivers/staging/comedi/proc.c

   1 /*
   2     module/proc.c
   3     /proc interface for comedi
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 /*
  25         This is some serious bloatware.
  26
  27         Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
  28         was cool.
  29 */
  30
  31 #include "comedidev.h"
  32 #include "comedi_internal.h"
  33 #include <linux/proc_fs.h>
  34 #include <linux/string.h>
  35
  36 #ifdef CONFIG_PROC_FS
  37 static int comedi_read(char *buf, char **start, off_t offset, int len,
  38                        int *eof, void *data)
  39 {
  40         int i;
  41         int devices_q = 0;
  42         int l = 0;
  43         struct comedi_driver *driv;
  44
  45         l += sprintf(buf + l,
  46                      "comedi version " COMEDI_RELEASE "\n"
  47                      "format string: %s\n",
  48                      "\"%2d: %-20s %-20s %4d\", i, "
  49                      "driver_name, board_name, n_subdevices");
  50
  51         for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
  52                 struct comedi_device_file_info *dev_file_info =
  53                     comedi_get_device_file_info(i);
  54                 struct comedi_device *dev;
  55
  56                 if (dev_file_info == NULL)
  57                         continue;
  58                 dev = dev_file_info->device;
  59
  60                 if (dev->attached) {
  61                         devices_q = 1;
  62                         l += sprintf(buf + l, "%2d: %-20s %-20s %4d\n",
  63                                      i,
  64                                      dev->driver->driver_name,
  65                                      dev->board_name, dev->n_subdevices);
  66                 }
  67         }
  68         if (!devices_q)
  69                 l += sprintf(buf + l, "no devices\n");
  70
  71         for (driv = comedi_drivers; driv; driv = driv->next) {
  72                 l += sprintf(buf + l, "%s:\n", driv->driver_name);
  73                 for (i = 0; i < driv->num_names; i++) {
  74                         l += sprintf(buf + l, " %s\n",
  75                                      *(char **)((char *)driv->board_name +
  76                                                 i * driv->offset));
  77                 }
  78                 if (!driv->num_names)
  79                         l += sprintf(buf + l, " %s\n", driv->driver_name);
  80         }
  81
  82         return l;
  83 }
  84
  85 void comedi_proc_init(void)
  86 {
  87         struct proc_dir_entry *comedi_proc;
  88
  89         comedi_proc = create_proc_entry("comedi", S_IFREG | S_IRUGO, NULL);
  90         if (comedi_proc)
  91                 comedi_proc->read_proc = comedi_read;
  92 }
  93
  94 void comedi_proc_cleanup(void)
  95 {
  96         remove_proc_entry("comedi", NULL);
  97 }
  98 #endif