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/seq_file.h>
  35
  36 static int comedi_read(struct seq_file *m, void *v)
  37 {
  38         int i;
  39         int devices_q = 0;
  40         struct comedi_driver *driv;
  41
  42         seq_printf(m,
  43                      "comedi version " COMEDI_RELEASE "\n"
  44                      "format string: %s\n",
  45                      "\"%2d: %-20s %-20s %4d\", i, "
  46                      "driver_name, board_name, n_subdevices");
  47
  48         for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
  49                 struct comedi_device *dev = comedi_dev_from_minor(i);
  50                 if (!dev)
  51                         continue;
  52
  53                 if (dev->attached) {
  54                         devices_q = 1;
  55                         seq_printf(m, "%2d: %-20s %-20s %4d\n",
  56                                    i, dev->driver->driver_name,
  57                                    dev->board_name, dev->n_subdevices);
  58                 }
  59         }
  60         if (!devices_q)
  61                 seq_puts(m, "no devices\n");
  62
  63         for (driv = comedi_drivers; driv; driv = driv->next) {
  64                 seq_printf(m, "%s:\n", driv->driver_name);
  65                 for (i = 0; i < driv->num_names; i++)
  66                         seq_printf(m, " %s\n",
  67                                    *(char **)((char *)driv->board_name +
  68                                               i * driv->offset));
  69
  70                 if (!driv->num_names)
  71                         seq_printf(m, " %s\n", driv->driver_name);
  72         }
  73
  74         return 0;
  75 }
  76
  77 /*
  78  * seq_file wrappers for procfile show routines.
  79  */
  80 static int comedi_proc_open(struct inode *inode, struct file *file)
  81 {
  82         return single_open(file, comedi_read, NULL);
  83 }
  84
  85 static const struct file_operations comedi_proc_fops = {
  86         .open           = comedi_proc_open,
  87         .read           = seq_read,
  88         .llseek         = seq_lseek,
  89         .release        = single_release,
  90 };
  91
  92 void comedi_proc_init(void)
  93 {
  94         proc_create("comedi", 0644, NULL, &comedi_proc_fops);
  95 }
  96
  97 void comedi_proc_cleanup(void)
  98 {
  99         remove_proc_entry("comedi", NULL);
 100 }