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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 
comedi_read(struct seq_file * m,void * v)30 static 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  */
comedi_proc_open(struct inode * inode,struct file * file)77 static int comedi_proc_open(struct inode *inode, struct file *file)
78 {
79 	return single_open(file, comedi_read, NULL);
80 }
81 
82 static 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 
comedi_proc_init(void)89 void comedi_proc_init(void)
90 {
91 	proc_create("comedi", 0644, NULL, &comedi_proc_fops);
92 }
93 
comedi_proc_cleanup(void)94 void comedi_proc_cleanup(void)
95 {
96 	remove_proc_entry("comedi", NULL);
97 }
98