proc.c

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/*
    module/proc.c
    /proc interface for comedi

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 1998 David A. Schleef <[email protected]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/*
    This is some serious bloatware.

    Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
    was cool.
*/

#define __NO_VERSION__
#include "comedidev.h"
#include "comedi_internal.h"
#include <linux/proc_fs.h>
#include <linux/string.h>

#ifdef CONFIG_PROC_FS
static int comedi_read(char *buf, char **start, off_t offset, int len,
               int *eof, void *data)
{
    int i;
    int devices_q = 0;
    int l = 0;
    struct comedi_driver *driv;

    l += sprintf(buf + l,
             "comedi version " COMEDI_RELEASE "\n"
             "format string: %s\n",
             "\"%2d: %-20s %-20s %4d\", i, "
             "driver_name, board_name, n_subdevices");

    for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
        struct comedi_device_file_info *dev_file_info =
            comedi_get_device_file_info(i);
        struct comedi_device *dev;

        if (dev_file_info == NULL)
            continue;
        dev = dev_file_info->device;

        if (dev->attached) {
            devices_q = 1;
            l += sprintf(buf + l, "%2d: %-20s %-20s %4d\n",
                     i,
                     dev->driver->driver_name,
                     dev->board_name, dev->n_subdevices);
        }
    }
    if (!devices_q)
        l += sprintf(buf + l, "no devices\n");

    for (driv = comedi_drivers; driv; driv = driv->next) {
        l += sprintf(buf + l, "%s:\n", driv->driver_name);
        for (i = 0; i < driv->num_names; i++) {
            l += sprintf(buf + l, " %s\n",
                     *(char **)((char *)driv->board_name +
                        i * driv->offset));
        }
        if (!driv->num_names)
            l += sprintf(buf + l, " %s\n", driv->driver_name);
    }

    return l;
}

void comedi_proc_init(void)
{
    struct proc_dir_entry *comedi_proc;

    comedi_proc = create_proc_entry("comedi", S_IFREG | S_IRUGO, NULL);
    if (comedi_proc)
        comedi_proc->read_proc = comedi_read;
}

void comedi_proc_cleanup(void)
{
    remove_proc_entry("comedi", NULL);
}
#endif