// SPDX-License-Identifier: GPL-2.0+
/*
 * /proc interface for comedi
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
 */

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

#include <linux/comedi/comedidev.h>
#include "comedi_internal.h"
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

static int comedi_read(struct seq_file *m, void *v)
{
        int i;
        int devices_q = 0;
        struct comedi_driver *driv;

        seq_printf(m, "comedi version " COMEDI_RELEASE "\nformat 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 *dev = comedi_dev_get_from_minor(i);

                if (!dev)
                        continue;

                down_read(&dev->attach_lock);
                if (dev->attached) {
                        devices_q = 1;
                        seq_printf(m, "%2d: %-20s %-20s %4d\n",
                                   i, dev->driver->driver_name,
                                   dev->board_name, dev->n_subdevices);
                }
                up_read(&dev->attach_lock);
                comedi_dev_put(dev);
        }
        if (!devices_q)
                seq_puts(m, "no devices\n");

        mutex_lock(&comedi_drivers_list_lock);
        for (driv = comedi_drivers; driv; driv = driv->next) {
                seq_printf(m, "%s:\n", driv->driver_name);
                for (i = 0; i < driv->num_names; i++)
                        seq_printf(m, " %s\n",
                                   *(char **)((char *)driv->board_name +
                                              i * driv->offset));

                if (!driv->num_names)
                        seq_printf(m, " %s\n", driv->driver_name);
        }
        mutex_unlock(&comedi_drivers_list_lock);

        return 0;
}

void __init comedi_proc_init(void)
{
        if (!proc_create_single("comedi", 0444, NULL, comedi_read))
                pr_warn("comedi: unable to create proc entry\n");
}

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