proc.c

Go to the documentation of this file.

/*
 * Stuff used by all variants of the driver
 *
 * Copyright (c) 2001 by Stefan Eilers,
 *                       Hansjoerg Lipp <[email protected]>,
 *                       Tilman Schmidt <[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.
 * =====================================================================
 */

#include "gigaset.h"

static ssize_t show_cidmode(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    struct cardstate *cs = dev_get_drvdata(dev);

    return sprintf(buf, "%u\n", cs->cidmode);
}

static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct cardstate *cs = dev_get_drvdata(dev);
    long int value;
    char *end;

    value = simple_strtol(buf, &end, 0);
    while (*end)
        if (!isspace(*end++))
            return -EINVAL;
    if (value < 0 || value > 1)
        return -EINVAL;

    if (mutex_lock_interruptible(&cs->mutex))
        return -ERESTARTSYS;

    cs->waiting = 1;
    if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
                   NULL, value, NULL)) {
        cs->waiting = 0;
        mutex_unlock(&cs->mutex);
        return -ENOMEM;
    }
    gigaset_schedule_event(cs);

    wait_event(cs->waitqueue, !cs->waiting);

    mutex_unlock(&cs->mutex);

    return count;
}

static DEVICE_ATTR(cidmode, S_IRUGO | S_IWUSR, show_cidmode, set_cidmode);

/* free sysfs for device */
void gigaset_free_dev_sysfs(struct cardstate *cs)
{
    if (!cs->tty_dev)
        return;

    gig_dbg(DEBUG_INIT, "removing sysfs entries");
    device_remove_file(cs->tty_dev, &dev_attr_cidmode);
}

/* initialize sysfs for device */
void gigaset_init_dev_sysfs(struct cardstate *cs)
{
    if (!cs->tty_dev)
        return;

    gig_dbg(DEBUG_INIT, "setting up sysfs");
    if (device_create_file(cs->tty_dev, &dev_attr_cidmode))
        pr_err("could not create sysfs attribute\n");
}