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/* $OpenBSD: ualea.c,v 1.2 2015/04/17 07:17:51 mpi Exp $ */
/*
* Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
* Copyright (c) 2007 Marc Balmer <mbalmer@openbsd.org>
* Copyright (C) 2015 Sean Levy <attila@stalphonsos.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Alea II TRNG. Produces 100kbit/sec of entropy by black magic
*
* Product information in English can be found here:
* http://www.araneus.fi/products/alea2/en/
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/timeout.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdevs.h>
#include <dev/rndvar.h>
#define ALEA_IFACE 0
#define ALEA_ENDPOINT 1
#define ALEA_MSECS 100
#define ALEA_READ_TIMEOUT 5000
#define ALEA_BUFSIZ 128
#define DEVNAME(_sc) ((_sc)->sc_dev.dv_xname)
struct ualea_softc {
struct device sc_dev;
struct usbd_device *sc_udev;
struct usbd_pipe *sc_pipe;
struct timeout sc_timeout;
struct usb_task sc_task;
struct usbd_xfer *sc_xfer;
int *sc_buf;
};
int ualea_match(struct device *, void *, void *);
void ualea_attach(struct device *, struct device *, void *);
int ualea_detach(struct device *, int);
void ualea_task(void *);
void ualea_timeout(void *);
struct cfdriver ualea_cd = {
NULL, "ualea", DV_DULL
};
const struct cfattach ualea_ca = {
sizeof(struct ualea_softc), ualea_match, ualea_attach, ualea_detach
};
int
ualea_match(struct device *parent, void *match, void *aux)
{
struct usb_attach_arg *uaa = aux;
if (uaa->iface == NULL)
return (UMATCH_NONE);
if ((uaa->vendor == USB_VENDOR_ARANEUS) &&
(uaa->product == USB_PRODUCT_ARANEUS_ALEA) &&
(uaa->ifaceno == ALEA_IFACE))
return (UMATCH_VENDOR_PRODUCT);
return (UMATCH_NONE);
}
void
ualea_attach(struct device *parent, struct device *self, void *aux)
{
struct ualea_softc *sc = (struct ualea_softc *)self;
struct usb_attach_arg *uaa = aux;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;
int ep_ibulk = -1;
usbd_status error;
int i;
sc->sc_udev = uaa->device;
id = usbd_get_interface_descriptor(uaa->iface);
for (i = 0; i < id->bNumEndpoints; i++) {
ed = usbd_interface2endpoint_descriptor(uaa->iface, i);
if (ed == NULL) {
printf("%s: failed to get endpoint %d descriptor\n",
DEVNAME(sc), i);
return;
}
if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK &&
UE_GET_ADDR(ed->bEndpointAddress) == ALEA_ENDPOINT) {
ep_ibulk = ed->bEndpointAddress;
break;
}
}
if (ep_ibulk == -1) {
printf("%s: missing endpoint\n", DEVNAME(sc));
return;
}
error = usbd_open_pipe(uaa->iface, ep_ibulk, USBD_EXCLUSIVE_USE,
&sc->sc_pipe);
if (error) {
printf("%s: failed to open bulk-in pipe: %s\n",
DEVNAME(sc), usbd_errstr(error));
return;
}
sc->sc_xfer = usbd_alloc_xfer(sc->sc_udev);
if (sc->sc_xfer == NULL) {
printf("%s: could not alloc xfer\n", DEVNAME(sc));
return;
}
sc->sc_buf = usbd_alloc_buffer(sc->sc_xfer, ALEA_BUFSIZ);
if (sc->sc_buf == NULL) {
printf("%s: could not alloc %d-byte buffer\n", DEVNAME(sc),
ALEA_BUFSIZ);
return;
}
usb_init_task(&sc->sc_task, ualea_task, sc, USB_TASK_TYPE_GENERIC);
timeout_set(&sc->sc_timeout, ualea_timeout, sc);
usb_add_task(sc->sc_udev, &sc->sc_task);
}
int
ualea_detach(struct device *self, int flags)
{
struct ualea_softc *sc = (struct ualea_softc *)self;
usb_rem_task(sc->sc_udev, &sc->sc_task);
if (timeout_initialized(&sc->sc_timeout))
timeout_del(&sc->sc_timeout);
if (sc->sc_xfer)
usbd_free_xfer(sc->sc_xfer);
if (sc->sc_pipe != NULL)
usbd_close_pipe(sc->sc_pipe);
return (0);
}
void
ualea_task(void *arg)
{
struct ualea_softc *sc = (struct ualea_softc *)arg;
usbd_status error;
u_int32_t len, i;
usbd_setup_xfer(sc->sc_xfer, sc->sc_pipe, NULL, sc->sc_buf,
ALEA_BUFSIZ, USBD_SHORT_XFER_OK | USBD_SYNCHRONOUS,
ALEA_READ_TIMEOUT, NULL);
error = usbd_transfer(sc->sc_xfer);
if (error) {
printf("%s: xfer failed: %s\n", DEVNAME(sc),
usbd_errstr(error));
goto bail;
}
usbd_get_xfer_status(sc->sc_xfer, NULL, NULL, &len, NULL);
if (len < sizeof(int)) {
printf("%s: xfer too short (%u bytes) - dropping\n",
DEVNAME(sc), len);
goto bail;
}
len /= sizeof(int);
/*
* A random(|ness) koan:
* children chug entropy like thirsty rhinos
* surfing at the mall
* privacy died in their hands
*/
for (i = 0; i < len; i++)
add_true_randomness(sc->sc_buf[i]);
bail:
timeout_add_msec(&sc->sc_timeout, ALEA_MSECS);
}
void
ualea_timeout(void *arg)
{
struct ualea_softc *sc = arg;
usb_add_task(sc->sc_udev, &sc->sc_task);
}
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