faux.h

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/*
 * DCL device/faux.h -- faux devices are just allocations.
 *
 * vkms_drv.c creates a parentless faux device to hang its connectors off
 * (mainline routes that through the driver core's faux bus).  DCL devices
 * only matter through devfs, and a faux device never gets a devt, so the
 * object exists to be stored and destroyed; its size is a fixed stand-in
 * because vkms only keeps the pointer.
 */
#ifndef _LINUX_DEVICE_FAUX_H
#define _LINUX_DEVICE_FAUX_H
 
#include <linux/slab.h>
#include <linux/device.h>   /* struct device -- mainline's faux_device
                 * embeds one, and vkms_drv.c takes &dev */
 
struct faux_device {
    struct device dev;
    char _tail[64];     /* stand-in for groups/glue_dir/bus; vkms
                 * only ever takes &dev and destroys it */
};
 
static inline struct faux_device *
faux_device_create(const char *name, void *parent, void *groups)
{
    struct faux_device *dev;
 
    (void)name; (void)parent; (void)groups;
    dev = (struct faux_device *)kmalloc(sizeof(struct faux_device), 0);
    if (dev)
        *dev = (struct faux_device){ 0 };
    return dev;
}
 
static inline void faux_device_destroy(struct faux_device *dev)
{
    kfree(dev);
}
 
#endif /* _LINUX_DEVICE_FAUX_H */