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
  19/*
  20        This is some serious bloatware.
  21
  22        Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
  23        was cool.
  24*/
  25
  26#include "comedidev.h"
  27#include "comedi_internal.h"
  28#include <linux/proc_fs.h>
  29#include <linux/seq_file.h>
  30
  31static int comedi_read(struct seq_file *m, void *v)
  32{
  33        int i;
  34        int devices_q = 0;
  35        struct comedi_driver *driv;
  36
  37        seq_printf(m,
  38                     "comedi version " COMEDI_RELEASE "\n"
  39                     "format string: %s\n",
  40                     "\"%2d: %-20s %-20s %4d\", i, "
  41                     "driver_name, board_name, n_subdevices");
  42
  43        for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
  44                struct comedi_device *dev = comedi_dev_from_minor(i);
  45                if (!dev)
  46                        continue;
  47
  48                if (dev->attached) {
  49                        devices_q = 1;
  50                        seq_printf(m, "%2d: %-20s %-20s %4d\n",
  51                                   i, dev->driver->driver_name,
  52                                   dev->board_name, dev->n_subdevices);
  53                }
  54        }
  55        if (!devices_q)
  56                seq_puts(m, "no devices\n");
  57
  58        for (driv = comedi_drivers; driv; driv = driv->next) {
  59                seq_printf(m, "%s:\n", driv->driver_name);
  60                for (i = 0; i < driv->num_names; i++)
  61                        seq_printf(m, " %s\n",
  62                                   *(char **)((char *)driv->board_name +
  63                                              i * driv->offset));
  64
  65                if (!driv->num_names)
  66                        seq_printf(m, " %s\n", driv->driver_name);
  67        }
  68
  69        return 0;
  70}
  71
  72/*
  73 * seq_file wrappers for procfile show routines.
  74 */
  75static int comedi_proc_open(struct inode *inode, struct file *file)
  76{
  77        return single_open(file, comedi_read, NULL);
  78}
  79
  80static const struct file_operations comedi_proc_fops = {
  81        .open           = comedi_proc_open,
  82        .read           = seq_read,
  83        .llseek         = seq_lseek,
  84        .release        = single_release,
  85};
  86
  87void comedi_proc_init(void)
  88{
  89        proc_create("comedi", 0644, NULL, &comedi_proc_fops);
  90}
  91
  92void comedi_proc_cleanup(void)
  93{
  94        remove_proc_entry("comedi", NULL);
  95}
  96