1/*
2 * /proc interface for comedi
3 *
4 * COMEDI - Linux Control and Measurement Device Interface
5 * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 */
17
18/*
19 * This is some serious bloatware.
20 *
21 * Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
22 * was cool.
23 */
24
25#include "comedidev.h"
26#include "comedi_internal.h"
27#include <linux/proc_fs.h>
28#include <linux/seq_file.h>
29
30static int comedi_read(struct seq_file *m, void *v)
31{
32	int i;
33	int devices_q = 0;
34	struct comedi_driver *driv;
35
36	seq_printf(m, "comedi version " COMEDI_RELEASE "\nformat string: %s\n",
37		   "\"%2d: %-20s %-20s %4d\", i, driver_name, board_name, n_subdevices");
38
39	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
40		struct comedi_device *dev = comedi_dev_get_from_minor(i);
41
42		if (!dev)
43			continue;
44
45		down_read(&dev->attach_lock);
46		if (dev->attached) {
47			devices_q = 1;
48			seq_printf(m, "%2d: %-20s %-20s %4d\n",
49				   i, dev->driver->driver_name,
50				   dev->board_name, dev->n_subdevices);
51		}
52		up_read(&dev->attach_lock);
53		comedi_dev_put(dev);
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