LXR linux/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
  36static 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 */
  80static int comedi_proc_open(struct inode *inode, struct file *file)
  81{
  82        return single_open(file, comedi_read, NULL);
  83}
  84
  85static 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
  92void comedi_proc_init(void)
  93{
  94        proc_create("comedi", 0644, NULL, &comedi_proc_fops);
  95}
  96
  97void comedi_proc_cleanup(void)
  98{
  99        remove_proc_entry("comedi", NULL);
 100}
 101