Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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_get_from_minor(i);
45
46 if (!dev)
47 continue;
48
49 down_read(&dev->attach_lock);
50 if (dev->attached) {
51 devices_q = 1;
52 seq_printf(m, "%2d: %-20s %-20s %4d\n",
53 i, dev->driver->driver_name,
54 dev->board_name, dev->n_subdevices);
55 }
56 up_read(&dev->attach_lock);
57 comedi_dev_put(dev);
58 }
59 if (!devices_q)
60 seq_puts(m, "no devices\n");
61
62 mutex_lock(&comedi_drivers_list_lock);
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 mutex_unlock(&comedi_drivers_list_lock);
74
75 return 0;
76}
77
78/*
79 * seq_file wrappers for procfile show routines.
80 */
81static int comedi_proc_open(struct inode *inode, struct file *file)
82{
83 return single_open(file, comedi_read, NULL);
84}
85
86static const struct file_operations comedi_proc_fops = {
87 .open = comedi_proc_open,
88 .read = seq_read,
89 .llseek = seq_lseek,
90 .release = single_release,
91};
92
93void comedi_proc_init(void)
94{
95 proc_create("comedi", 0644, NULL, &comedi_proc_fops);
96}
97
98void comedi_proc_cleanup(void)
99{
100 remove_proc_entry("comedi", NULL);
101}