proc.c revision c383e2d6dacf0b6fdd40fbaf044e235cac54a20f 
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	mutex_lock(&comedi_drivers_list_lock);
59	for (driv = comedi_drivers; driv; driv = driv->next) {
60		seq_printf(m, "%s:\n", driv->driver_name);
61		for (i = 0; i < driv->num_names; i++)
62			seq_printf(m, " %s\n",
63				   *(char **)((char *)driv->board_name +
64					      i * driv->offset));
65
66		if (!driv->num_names)
67			seq_printf(m, " %s\n", driv->driver_name);
68	}
69	mutex_unlock(&comedi_drivers_list_lock);
70
71	return 0;
72}
73
74/*
75 * seq_file wrappers for procfile show routines.
76 */
77static int comedi_proc_open(struct inode *inode, struct file *file)
78{
79	return single_open(file, comedi_read, NULL);
80}
81
82static const struct file_operations comedi_proc_fops = {
83	.open		= comedi_proc_open,
84	.read		= seq_read,
85	.llseek		= seq_lseek,
86	.release	= single_release,
87};
88
89void comedi_proc_init(void)
90{
91	proc_create("comedi", 0644, NULL, &comedi_proc_fops);
92}
93
94void comedi_proc_cleanup(void)
95{
96	remove_proc_entry("comedi", NULL);
97}
98