参照元

説明

引数

返り値

参考

実装

/**
 * cdev_add() - add a char device to the system
 * @p: the cdev structure for the device
 * @dev: the first device number for which this device is responsible
 * @count: the number of consecutive minor numbers corresponding to this
 *         device
 *
 * cdev_add() adds the device represented by @p to the system, making it
 * live immediately.  A negative error code is returned on failure.
 */
int cdev_add(struct cdev *p, dev_t dev, unsigned count)
{
        int error;

        p->dev = dev;
        p->count = count;

        error = kobj_map(cdev_map, dev, count, NULL,
                         exact_match, exact_lock, p);
        if (error)
                return error;
        kobject_get(p->kobj.parent);
        return 0;
}

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