drivers/staging/comedi/proc.c

   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
  31 static 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  */
  81 static int comedi_proc_open(struct inode *inode, struct file *file)
  82 {
  83         return single_open(file, comedi_read, NULL);
  84 }
  85
  86 static 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
  93 void comedi_proc_init(void)
  94 {
  95         proc_create("comedi", 0644, NULL, &comedi_proc_fops);
  96 }
  97
  98 void comedi_proc_cleanup(void)
  99 {
 100         remove_proc_entry("comedi", NULL);
 101 }