linux-imx

// SPDX-License-Identifier: GPL-2.0

/* Sysctl interface for parport devices.

 * 

 * Authors: David Campbell

 *          Tim Waugh <tim@cyberelk.demon.co.uk>

 *          Philip Blundell <philb@gnu.org>

 *          Andrea Arcangeli

 *          Riccardo Facchetti <fizban@tin.it>

 *

 * based on work by Grant Guenther <grant@torque.net>

 *              and Philip Blundell

 *

 * Cleaned up include files - Russell King <linux@arm.uk.linux.org>

 */

​

#include <linux/string.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/parport.h>

#include <linux/ctype.h>

#include <linux/sysctl.h>

#include <linux/device.h>

​

#include <linux/uaccess.h>

​

#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)

​

#define PARPORT_MIN_TIMESLICE_VALUE 1ul 

#define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)

#define PARPORT_MIN_SPINTIME_VALUE 1

#define PARPORT_MAX_SPINTIME_VALUE 1000

​

static int do_active_device(struct ctl_table *table, int write,

              void __user *result, size_t *lenp, loff_t *ppos)

{

    struct parport *port = (struct parport *)table->extra1;

    char buffer[256];

    struct pardevice *dev;

    int len = 0;

​

    if (write)      /* can't happen anyway */

        return -EACCES;

​

    if (*ppos) {

        *lenp = 0;

        return 0;

    }

    for (dev = port->devices; dev ; dev = dev->next) {

        if(dev == port->cad) {

            len += sprintf(buffer, "%s\n", dev->name);

        }

    }

​

    if(!len) {

        len += sprintf(buffer, "%s\n", "none");

    }

​

    if (len > *lenp)

        len = *lenp;

    else

        *lenp = len;

​

    *ppos += len;

​

    return copy_to_user(result, buffer, len) ? -EFAULT : 0;

}

​

#ifdef CONFIG_PARPORT_1284

static int do_autoprobe(struct ctl_table *table, int write,

            void __user *result, size_t *lenp, loff_t *ppos)

{

    struct parport_device_info *info = table->extra2;

    const char *str;

    char buffer[256];

    int len = 0;

​

    if (write) /* permissions stop this */

        return -EACCES;

​

    if (*ppos) {

        *lenp = 0;

        return 0;

    }

    if ((str = info->class_name) != NULL)

        len += sprintf (buffer + len, "CLASS:%s;\n", str);

​

    if ((str = info->model) != NULL)