1// SPDX-License-Identifier: GPL-2.0+
2/*
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
9/*
10 * This is some serious bloatware.
11 *
12 * Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
13 * was cool.
14 */
15
16#include <linux/comedi/comedidev.h>
17#include "comedi_internal.h"
18#include <linux/proc_fs.h>
19#include <linux/seq_file.h>
20
21static int comedi_read(struct seq_file *m, void *v)
22{
23	int i;
24	int devices_q = 0;
25	struct comedi_driver *driv;
26
27	seq_printf(m, "comedi version " COMEDI_RELEASE "\nformat string: %s\n",
28		   "\"%2d: %-20s %-20s %4d\", i, driver_name, board_name, n_subdevices");
29
30	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
31		struct comedi_device *dev = comedi_dev_get_from_minor(i);
32
33		if (!dev)
34			continue;
35
36		down_read(&dev->attach_lock);
37		if (dev->attached) {
38			devices_q = 1;
39			seq_printf(m, "%2d: %-20s %-20s %4d\n",
40				   i, dev->driver->driver_name,
41				   dev->board_name, dev->n_subdevices);
42		}
43		up_read(&dev->attach_lock);
44		comedi_dev_put(dev);
45	}
46	if (!devices_q)
47		seq_puts(m, "no devices\n");
48
49	mutex_lock(&comedi_drivers_list_lock);
50	for (driv = comedi_drivers; driv; driv = driv->next) {
51		seq_printf(m, "%s:\n", driv->driver_name);
52		for (i = 0; i < driv->num_names; i++)
53			seq_printf(m, " %s\n",
54				   *(char **)((char *)driv->board_name +
55					      i * driv->offset));
56
57		if (!driv->num_names)
58			seq_printf(m, " %s\n", driv->driver_name);
59	}
60	mutex_unlock(&comedi_drivers_list_lock);
61
62	return 0;
63}
64
65void __init comedi_proc_init(void)
66{
67	if (!proc_create_single("comedi", 0444, NULL, comedi_read))
68		pr_warn("comedi: unable to create proc entry\n");
69}
70
71void comedi_proc_cleanup(void)
72{
73	remove_proc_entry("comedi", NULL);
74}
75