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freebsd-skq/sys/dev/usb/usb_dev.c
Hans Petter Selasky b06d477b3c When we fail to get a USB reference we should just return, because 
there are no more references held.

MFC after:	3 days
2014-10-03 16:09:46 +00:00

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/* $FreeBSD$ */
/*-
* Copyright (c) 2006-2008 Hans Petter Selasky. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* usb_dev.c - An abstraction layer for creating devices under /dev/...
*/
#ifdef USB_GLOBAL_INCLUDE_FILE
#include USB_GLOBAL_INCLUDE_FILE
#else
#include <sys/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <dev/usb/usb.h>
#include <dev/usb/usb_ioctl.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#define USB_DEBUG_VAR usb_fifo_debug
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_dev.h>
#include <dev/usb/usb_mbuf.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_generic.h>
#include <dev/usb/usb_dynamic.h>
#include <dev/usb/usb_util.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#include <sys/filio.h>
#include <sys/ttycom.h>
#include <sys/syscallsubr.h>
#include <machine/stdarg.h>
#endif /* USB_GLOBAL_INCLUDE_FILE */
#if USB_HAVE_UGEN
#ifdef USB_DEBUG
static int usb_fifo_debug = 0;
static SYSCTL_NODE(_hw_usb, OID_AUTO, dev, CTLFLAG_RW, 0, "USB device");
SYSCTL_INT(_hw_usb_dev, OID_AUTO, debug, CTLFLAG_RWTUN,
&usb_fifo_debug, 0, "Debug Level");
#endif
#if ((__FreeBSD_version >= 700001) || (__FreeBSD_version == 0) || \
((__FreeBSD_version >= 600034) && (__FreeBSD_version < 700000)))
#define USB_UCRED struct ucred *ucred,
#else
#define USB_UCRED
#endif
/* prototypes */
static int usb_fifo_open(struct usb_cdev_privdata *,
struct usb_fifo *, int);
static void usb_fifo_close(struct usb_fifo *, int);
static void usb_dev_init(void *);
static void usb_dev_init_post(void *);
static void usb_dev_uninit(void *);
static int usb_fifo_uiomove(struct usb_fifo *, void *, int,
struct uio *);
static void usb_fifo_check_methods(struct usb_fifo_methods *);
static struct usb_fifo *usb_fifo_alloc(struct mtx *);
static struct usb_endpoint *usb_dev_get_ep(struct usb_device *, uint8_t,
uint8_t);
static void usb_loc_fill(struct usb_fs_privdata *,
struct usb_cdev_privdata *);
static void usb_close(void *);
static usb_error_t usb_ref_device(struct usb_cdev_privdata *, struct usb_cdev_refdata *, int);
static usb_error_t usb_usb_ref_device(struct usb_cdev_privdata *, struct usb_cdev_refdata *);
static void usb_unref_device(struct usb_cdev_privdata *, struct usb_cdev_refdata *);
static d_open_t usb_open;
static d_ioctl_t usb_ioctl;
static d_read_t usb_read;
static d_write_t usb_write;
static d_poll_t usb_poll;
static d_kqfilter_t usb_kqfilter;
static d_ioctl_t usb_static_ioctl;
static usb_fifo_open_t usb_fifo_dummy_open;
static usb_fifo_close_t usb_fifo_dummy_close;
static usb_fifo_ioctl_t usb_fifo_dummy_ioctl;
static usb_fifo_cmd_t usb_fifo_dummy_cmd;
/* character device structure used for devices (/dev/ugenX.Y and /dev/uXXX) */
struct cdevsw usb_devsw = {
.d_version = D_VERSION,
.d_open = usb_open,
.d_ioctl = usb_ioctl,
.d_name = "usbdev",
.d_flags = D_TRACKCLOSE,
.d_read = usb_read,
.d_write = usb_write,
.d_poll = usb_poll,
.d_kqfilter = usb_kqfilter,
};
static struct cdev* usb_dev = NULL;
/* character device structure used for /dev/usb */
static struct cdevsw usb_static_devsw = {
.d_version = D_VERSION,
.d_ioctl = usb_static_ioctl,
.d_name = "usb"
};
static TAILQ_HEAD(, usb_symlink) usb_sym_head;
static struct sx usb_sym_lock;
struct mtx usb_ref_lock;
/*------------------------------------------------------------------------*
* usb_loc_fill
*
* This is used to fill out a usb_cdev_privdata structure based on the
* device's address as contained in usb_fs_privdata.
*------------------------------------------------------------------------*/
static void
usb_loc_fill(struct usb_fs_privdata* pd, struct usb_cdev_privdata *cpd)
{
cpd->bus_index = pd->bus_index;
cpd->dev_index = pd->dev_index;
cpd->ep_addr = pd->ep_addr;
cpd->fifo_index = pd->fifo_index;
}
/*------------------------------------------------------------------------*
* usb_ref_device
*
* This function is used to atomically refer an USB device by its
* device location. If this function returns success the USB device
* will not dissappear until the USB device is unreferenced.
*
* Return values:
* 0: Success, refcount incremented on the given USB device.
* Else: Failure.
*------------------------------------------------------------------------*/
static usb_error_t
usb_ref_device(struct usb_cdev_privdata *cpd,
struct usb_cdev_refdata *crd, int need_uref)
{
struct usb_fifo **ppf;
struct usb_fifo *f;
DPRINTFN(2, "cpd=%p need uref=%d\n", cpd, need_uref);
/* clear all refs */
memset(crd, 0, sizeof(*crd));
mtx_lock(&usb_ref_lock);
cpd->bus = devclass_get_softc(usb_devclass_ptr, cpd->bus_index);
if (cpd->bus == NULL) {
DPRINTFN(2, "no bus at %u\n", cpd->bus_index);
goto error;
}
cpd->udev = cpd->bus->devices[cpd->dev_index];
if (cpd->udev == NULL) {
DPRINTFN(2, "no device at %u\n", cpd->dev_index);
goto error;
}
if (cpd->udev->state == USB_STATE_DETACHED &&
(need_uref != 2)) {
DPRINTFN(2, "device is detached\n");
goto error;
}
if (need_uref) {
DPRINTFN(2, "ref udev - needed\n");
if (cpd->udev->refcount == USB_DEV_REF_MAX) {
DPRINTFN(2, "no dev ref\n");
goto error;
}
cpd->udev->refcount++;
mtx_unlock(&usb_ref_lock);
/*
* We need to grab the enumeration SX-lock before
* grabbing the FIFO refs to avoid deadlock at detach!
*/
crd->do_unlock = usbd_enum_lock(cpd->udev);
mtx_lock(&usb_ref_lock);
/*
* Set "is_uref" after grabbing the default SX lock
*/
crd->is_uref = 1;
}
/* check if we are doing an open */
if (cpd->fflags == 0) {
/* use zero defaults */
} else {
/* check for write */
if (cpd->fflags & FWRITE) {
ppf = cpd->udev->fifo;
f = ppf[cpd->fifo_index + USB_FIFO_TX];
crd->txfifo = f;
crd->is_write = 1; /* ref */
if (f == NULL || f->refcount == USB_FIFO_REF_MAX)
goto error;
if (f->curr_cpd != cpd)
goto error;
/* check if USB-FS is active */
if (f->fs_ep_max != 0) {
crd->is_usbfs = 1;
}
}
/* check for read */
if (cpd->fflags & FREAD) {
ppf = cpd->udev->fifo;
f = ppf[cpd->fifo_index + USB_FIFO_RX];
crd->rxfifo = f;
crd->is_read = 1; /* ref */
if (f == NULL || f->refcount == USB_FIFO_REF_MAX)
goto error;
if (f->curr_cpd != cpd)
goto error;
/* check if USB-FS is active */
if (f->fs_ep_max != 0) {
crd->is_usbfs = 1;
}
}
}
/* when everything is OK we increment the refcounts */
if (crd->is_write) {
DPRINTFN(2, "ref write\n");
crd->txfifo->refcount++;
}
if (crd->is_read) {
DPRINTFN(2, "ref read\n");
crd->rxfifo->refcount++;
}
mtx_unlock(&usb_ref_lock);
return (0);
error:
if (crd->do_unlock)
usbd_enum_unlock(cpd->udev);
if (crd->is_uref) {
cpd->udev->refcount--;
cv_broadcast(&cpd->udev->ref_cv);
}
mtx_unlock(&usb_ref_lock);
DPRINTFN(2, "fail\n");
/* clear all refs */
memset(crd, 0, sizeof(*crd));
return (USB_ERR_INVAL);
}
/*------------------------------------------------------------------------*
* usb_usb_ref_device
*
* This function is used to upgrade an USB reference to include the
* USB device reference on a USB location.
*
* Return values:
* 0: Success, refcount incremented on the given USB device.
* Else: Failure.
*------------------------------------------------------------------------*/
static usb_error_t
usb_usb_ref_device(struct usb_cdev_privdata *cpd,
struct usb_cdev_refdata *crd)
{
/*
* Check if we already got an USB reference on this location:
*/
if (crd->is_uref)
return (0); /* success */
/*
* To avoid deadlock at detach we need to drop the FIFO ref
* and re-acquire a new ref!
*/
usb_unref_device(cpd, crd);
return (usb_ref_device(cpd, crd, 1 /* need uref */));
}
/*------------------------------------------------------------------------*
* usb_unref_device
*
* This function will release the reference count by one unit for the
* given USB device.
*------------------------------------------------------------------------*/
static void
usb_unref_device(struct usb_cdev_privdata *cpd,
struct usb_cdev_refdata *crd)
{
DPRINTFN(2, "cpd=%p is_uref=%d\n", cpd, crd->is_uref);
if (crd->do_unlock)
usbd_enum_unlock(cpd->udev);
mtx_lock(&usb_ref_lock);
if (crd->is_read) {
if (--(crd->rxfifo->refcount) == 0) {
cv_signal(&crd->rxfifo->cv_drain);
}
crd->is_read = 0;
}
if (crd->is_write) {
if (--(crd->txfifo->refcount) == 0) {
cv_signal(&crd->txfifo->cv_drain);
}
crd->is_write = 0;
}
if (crd->is_uref) {
crd->is_uref = 0;
cpd->udev->refcount--;
cv_broadcast(&cpd->udev->ref_cv);
}
mtx_unlock(&usb_ref_lock);
}
static struct usb_fifo *
usb_fifo_alloc(struct mtx *mtx)
{
struct usb_fifo *f;
f = malloc(sizeof(*f), M_USBDEV, M_WAITOK | M_ZERO);
if (f != NULL) {
cv_init(&f->cv_io, "FIFO-IO");
cv_init(&f->cv_drain, "FIFO-DRAIN");
f->priv_mtx = mtx;
f->refcount = 1;
knlist_init_mtx(&f->selinfo.si_note, mtx);
}
return (f);
}
/*------------------------------------------------------------------------*
* usb_fifo_create
*------------------------------------------------------------------------*/
static int
usb_fifo_create(struct usb_cdev_privdata *cpd,
struct usb_cdev_refdata *crd)
{
struct usb_device *udev = cpd->udev;
struct usb_fifo *f;
struct usb_endpoint *ep;
uint8_t n;
uint8_t is_tx;
uint8_t is_rx;
uint8_t no_null;
uint8_t is_busy;
int e = cpd->ep_addr;
is_tx = (cpd->fflags & FWRITE) ? 1 : 0;
is_rx = (cpd->fflags & FREAD) ? 1 : 0;
no_null = 1;
is_busy = 0;
/* Preallocated FIFO */
if (e < 0) {
DPRINTFN(5, "Preallocated FIFO\n");
if (is_tx) {
f = udev->fifo[cpd->fifo_index + USB_FIFO_TX];
if (f == NULL)
return (EINVAL);
crd->txfifo = f;
}
if (is_rx) {
f = udev->fifo[cpd->fifo_index + USB_FIFO_RX];
if (f == NULL)
return (EINVAL);
crd->rxfifo = f;
}
return (0);
}
KASSERT(e >= 0 && e <= 15, ("endpoint %d out of range", e));
/* search for a free FIFO slot */
DPRINTFN(5, "Endpoint device, searching for 0x%02x\n", e);
for (n = 0;; n += 2) {
if (n == USB_FIFO_MAX) {
if (no_null) {
no_null = 0;
n = 0;
} else {
/* end of FIFOs reached */
DPRINTFN(5, "out of FIFOs\n");
return (ENOMEM);
}
}
/* Check for TX FIFO */
if (is_tx) {
f = udev->fifo[n + USB_FIFO_TX];
if (f != NULL) {
if (f->dev_ep_index != e) {
/* wrong endpoint index */
continue;
}
if (f->curr_cpd != NULL) {
/* FIFO is opened */
is_busy = 1;
continue;
}
} else if (no_null) {
continue;
}
}
/* Check for RX FIFO */
if (is_rx) {
f = udev->fifo[n + USB_FIFO_RX];
if (f != NULL) {
if (f->dev_ep_index != e) {
/* wrong endpoint index */
continue;
}
if (f->curr_cpd != NULL) {
/* FIFO is opened */
is_busy = 1;
continue;
}
} else if (no_null) {
continue;
}
}
break;
}
if (no_null == 0) {
if (e >= (USB_EP_MAX / 2)) {
/* we don't create any endpoints in this range */
DPRINTFN(5, "ep out of range\n");
return (is_busy ? EBUSY : EINVAL);
}
}
if ((e != 0) && is_busy) {
/*
* Only the default control endpoint is allowed to be
* opened multiple times!
*/
DPRINTFN(5, "busy\n");
return (EBUSY);
}
/* Check TX FIFO */
if (is_tx &&
(udev->fifo[n + USB_FIFO_TX] == NULL)) {
ep = usb_dev_get_ep(udev, e, USB_FIFO_TX);
DPRINTFN(5, "dev_get_endpoint(%d, 0x%x)\n", e, USB_FIFO_TX);
if (ep == NULL) {
DPRINTFN(5, "dev_get_endpoint returned NULL\n");
return (EINVAL);
}
f = usb_fifo_alloc(&udev->device_mtx);
if (f == NULL) {
DPRINTFN(5, "could not alloc tx fifo\n");
return (ENOMEM);
}
/* update some fields */
f->fifo_index = n + USB_FIFO_TX;
f->dev_ep_index = e;
f->priv_sc0 = ep;
f->methods = &usb_ugen_methods;
f->iface_index = ep->iface_index;
f->udev = udev;
mtx_lock(&usb_ref_lock);
udev->fifo[n + USB_FIFO_TX] = f;
mtx_unlock(&usb_ref_lock);
}
/* Check RX FIFO */
if (is_rx &&
(udev->fifo[n + USB_FIFO_RX] == NULL)) {
ep = usb_dev_get_ep(udev, e, USB_FIFO_RX);
DPRINTFN(5, "dev_get_endpoint(%d, 0x%x)\n", e, USB_FIFO_RX);
if (ep == NULL) {
DPRINTFN(5, "dev_get_endpoint returned NULL\n");
return (EINVAL);
}
f = usb_fifo_alloc(&udev->device_mtx);
if (f == NULL) {
DPRINTFN(5, "could not alloc rx fifo\n");
return (ENOMEM);
}
/* update some fields */
f->fifo_index = n + USB_FIFO_RX;
f->dev_ep_index = e;
f->priv_sc0 = ep;
f->methods = &usb_ugen_methods;
f->iface_index = ep->iface_index;
f->udev = udev;
mtx_lock(&usb_ref_lock);
udev->fifo[n + USB_FIFO_RX] = f;
mtx_unlock(&usb_ref_lock);
}
if (is_tx) {
crd->txfifo = udev->fifo[n + USB_FIFO_TX];
}
if (is_rx) {
crd->rxfifo = udev->fifo[n + USB_FIFO_RX];
}
/* fill out fifo index */
DPRINTFN(5, "fifo index = %d\n", n);
cpd->fifo_index = n;
/* complete */
return (0);
}
void
usb_fifo_free(struct usb_fifo *f)
{
uint8_t n;
if (f == NULL) {
/* be NULL safe */
return;
}
/* destroy symlink devices, if any */
for (n = 0; n != 2; n++) {
if (f->symlink[n]) {
usb_free_symlink(f->symlink[n]);
f->symlink[n] = NULL;
}
}
mtx_lock(&usb_ref_lock);
/* delink ourselves to stop calls from userland */
if ((f->fifo_index < USB_FIFO_MAX) &&
(f->udev != NULL) &&
(f->udev->fifo[f->fifo_index] == f)) {
f->udev->fifo[f->fifo_index] = NULL;
} else {
DPRINTFN(0, "USB FIFO %p has not been linked\n", f);
}
/* decrease refcount */
f->refcount--;
/* prevent any write flush */
f->flag_iserror = 1;
/* need to wait until all callers have exited */
while (f->refcount != 0) {
mtx_unlock(&usb_ref_lock); /* avoid LOR */
mtx_lock(f->priv_mtx);
/* get I/O thread out of any sleep state */
if (f->flag_sleeping) {
f->flag_sleeping = 0;
cv_broadcast(&f->cv_io);
}
mtx_unlock(f->priv_mtx);
mtx_lock(&usb_ref_lock);
/*
* Check if the "f->refcount" variable reached zero
* during the unlocked time before entering wait:
*/
if (f->refcount == 0)
break;
/* wait for sync */
cv_wait(&f->cv_drain, &usb_ref_lock);
}
mtx_unlock(&usb_ref_lock);
/* take care of closing the device here, if any */
usb_fifo_close(f, 0);
cv_destroy(&f->cv_io);
cv_destroy(&f->cv_drain);
knlist_clear(&f->selinfo.si_note, 0);
seldrain(&f->selinfo);
knlist_destroy(&f->selinfo.si_note);
free(f, M_USBDEV);
}
static struct usb_endpoint *
usb_dev_get_ep(struct usb_device *udev, uint8_t ep_index, uint8_t dir)
{
struct usb_endpoint *ep;
uint8_t ep_dir;
if (ep_index == 0) {
ep = &udev->ctrl_ep;
} else {
if (dir == USB_FIFO_RX) {
if (udev->flags.usb_mode == USB_MODE_HOST) {
ep_dir = UE_DIR_IN;
} else {
ep_dir = UE_DIR_OUT;
}
} else {
if (udev->flags.usb_mode == USB_MODE_HOST) {
ep_dir = UE_DIR_OUT;
} else {
ep_dir = UE_DIR_IN;
}
}
ep = usbd_get_ep_by_addr(udev, ep_index | ep_dir);
}
if (ep == NULL) {
/* if the endpoint does not exist then return */
return (NULL);
}
if (ep->edesc == NULL) {
/* invalid endpoint */
return (NULL);
}
return (ep); /* success */
}
/*------------------------------------------------------------------------*
* usb_fifo_open
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
static int
usb_fifo_open(struct usb_cdev_privdata *cpd,
struct usb_fifo *f, int fflags)
{
int err;
if (f == NULL) {
/* no FIFO there */
DPRINTFN(2, "no FIFO\n");
return (ENXIO);
}
/* remove FWRITE and FREAD flags */
fflags &= ~(FWRITE | FREAD);
/* set correct file flags */
if ((f->fifo_index & 1) == USB_FIFO_TX) {
fflags |= FWRITE;
} else {
fflags |= FREAD;
}
/* check if we are already opened */
/* we don't need any locks when checking this variable */
if (f->curr_cpd != NULL) {
err = EBUSY;
goto done;
}
/* reset short flag before open */
f->flag_short = 0;
/* call open method */
err = (f->methods->f_open) (f, fflags);
if (err) {
goto done;
}
mtx_lock(f->priv_mtx);
/* reset sleep flag */
f->flag_sleeping = 0;
/* reset error flag */
f->flag_iserror = 0;
/* reset complete flag */
f->flag_iscomplete = 0;
/* reset select flag */
f->flag_isselect = 0;
/* reset flushing flag */
f->flag_flushing = 0;
/* reset ASYNC proc flag */
f->async_p = NULL;
mtx_lock(&usb_ref_lock);
/* flag the fifo as opened to prevent others */
f->curr_cpd = cpd;
mtx_unlock(&usb_ref_lock);
/* reset queue */
usb_fifo_reset(f);
mtx_unlock(f->priv_mtx);
done:
return (err);
}
/*------------------------------------------------------------------------*
* usb_fifo_reset
*------------------------------------------------------------------------*/
void
usb_fifo_reset(struct usb_fifo *f)
{
struct usb_mbuf *m;
if (f == NULL) {
return;
}
while (1) {
USB_IF_DEQUEUE(&f->used_q, m);
if (m) {
USB_IF_ENQUEUE(&f->free_q, m);
} else {
break;
}
}
/* reset have fragment flag */
f->flag_have_fragment = 0;
}
/*------------------------------------------------------------------------*
* usb_fifo_close
*------------------------------------------------------------------------*/
static void
usb_fifo_close(struct usb_fifo *f, int fflags)
{
int err;
/* check if we are not opened */
if (f->curr_cpd == NULL) {
/* nothing to do - already closed */
return;
}
mtx_lock(f->priv_mtx);
/* clear current cdev private data pointer */
mtx_lock(&usb_ref_lock);
f->curr_cpd = NULL;
mtx_unlock(&usb_ref_lock);
/* check if we are watched by kevent */
KNOTE_LOCKED(&f->selinfo.si_note, 0);
/* check if we are selected */
if (f->flag_isselect) {
selwakeup(&f->selinfo);
f->flag_isselect = 0;
}
/* check if a thread wants SIGIO */
if (f->async_p != NULL) {
PROC_LOCK(f->async_p);
kern_psignal(f->async_p, SIGIO);
PROC_UNLOCK(f->async_p);
f->async_p = NULL;
}
/* remove FWRITE and FREAD flags */
fflags &= ~(FWRITE | FREAD);
/* flush written data, if any */
if ((f->fifo_index & 1) == USB_FIFO_TX) {
if (!f->flag_iserror) {
/* set flushing flag */
f->flag_flushing = 1;
/* get the last packet in */
if (f->flag_have_fragment) {
struct usb_mbuf *m;
f->flag_have_fragment = 0;
USB_IF_DEQUEUE(&f->free_q, m);
if (m) {
USB_IF_ENQUEUE(&f->used_q, m);
}
}
/* start write transfer, if not already started */
(f->methods->f_start_write) (f);
/* check if flushed already */
while (f->flag_flushing &&
(!f->flag_iserror)) {
/* wait until all data has been written */
f->flag_sleeping = 1;
err = cv_wait_sig(&f->cv_io, f->priv_mtx);
if (err) {
DPRINTF("signal received\n");
break;
}
}
}
fflags |= FWRITE;
/* stop write transfer, if not already stopped */
(f->methods->f_stop_write) (f);
} else {
fflags |= FREAD;
/* stop write transfer, if not already stopped */
(f->methods->f_stop_read) (f);
}
/* check if we are sleeping */
if (f->flag_sleeping) {
DPRINTFN(2, "Sleeping at close!\n");
}
mtx_unlock(f->priv_mtx);
/* call close method */
(f->methods->f_close) (f, fflags);
DPRINTF("closed\n");
}
/*------------------------------------------------------------------------*
* usb_open - cdev callback
*------------------------------------------------------------------------*/
static int
usb_open(struct cdev *dev, int fflags, int devtype, struct thread *td)
{
struct usb_fs_privdata* pd = (struct usb_fs_privdata*)dev->si_drv1;
struct usb_cdev_refdata refs;
struct usb_cdev_privdata *cpd;
int err, ep;
DPRINTFN(2, "%s fflags=0x%08x\n", devtoname(dev), fflags);
KASSERT(fflags & (FREAD|FWRITE), ("invalid open flags"));
if (((fflags & FREAD) && !(pd->mode & FREAD)) ||
((fflags & FWRITE) && !(pd->mode & FWRITE))) {
DPRINTFN(2, "access mode not supported\n");
return (EPERM);
}
cpd = malloc(sizeof(*cpd), M_USBDEV, M_WAITOK | M_ZERO);
ep = cpd->ep_addr = pd->ep_addr;
usb_loc_fill(pd, cpd);
err = usb_ref_device(cpd, &refs, 1);
if (err) {
DPRINTFN(2, "cannot ref device\n");
free(cpd, M_USBDEV);
return (ENXIO);
}
cpd->fflags = fflags; /* access mode for open lifetime */
/* create FIFOs, if any */
err = usb_fifo_create(cpd, &refs);
/* check for error */
if (err) {
DPRINTFN(2, "cannot create fifo\n");
usb_unref_device(cpd, &refs);
free(cpd, M_USBDEV);
return (err);
}
if (fflags & FREAD) {
err = usb_fifo_open(cpd, refs.rxfifo, fflags);
if (err) {
DPRINTFN(2, "read open failed\n");
usb_unref_device(cpd, &refs);
free(cpd, M_USBDEV);
return (err);
}
}
if (fflags & FWRITE) {
err = usb_fifo_open(cpd, refs.txfifo, fflags);
if (err) {
DPRINTFN(2, "write open failed\n");
if (fflags & FREAD) {
usb_fifo_close(refs.rxfifo, fflags);
}
usb_unref_device(cpd, &refs);
free(cpd, M_USBDEV);
return (err);
}
}
usb_unref_device(cpd, &refs);
devfs_set_cdevpriv(cpd, usb_close);
return (0);
}
/*------------------------------------------------------------------------*
* usb_close - cdev callback
*------------------------------------------------------------------------*/
static void
usb_close(void *arg)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata *cpd = arg;
int err;
DPRINTFN(2, "cpd=%p\n", cpd);
err = usb_ref_device(cpd, &refs,
2 /* uref and allow detached state */);
if (err) {
DPRINTFN(2, "Cannot grab USB reference when "
"closing USB file handle\n");
goto done;
}
if (cpd->fflags & FREAD) {
usb_fifo_close(refs.rxfifo, cpd->fflags);
}
if (cpd->fflags & FWRITE) {
usb_fifo_close(refs.txfifo, cpd->fflags);
}
usb_unref_device(cpd, &refs);
done:
free(cpd, M_USBDEV);
}
static void
usb_dev_init(void *arg)
{
mtx_init(&usb_ref_lock, "USB ref mutex", NULL, MTX_DEF);
sx_init(&usb_sym_lock, "USB sym mutex");
TAILQ_INIT(&usb_sym_head);
/* check the UGEN methods */
usb_fifo_check_methods(&usb_ugen_methods);
}
SYSINIT(usb_dev_init, SI_SUB_KLD, SI_ORDER_FIRST, usb_dev_init, NULL);
static void
usb_dev_init_post(void *arg)
{
/*
* Create /dev/usb - this is needed for usbconfig(8), which
* needs a well-known device name to access.
*/
usb_dev = make_dev(&usb_static_devsw, 0, UID_ROOT, GID_OPERATOR,
0644, USB_DEVICE_NAME);
if (usb_dev == NULL) {
DPRINTFN(0, "Could not create usb bus device\n");
}
}
SYSINIT(usb_dev_init_post, SI_SUB_KICK_SCHEDULER, SI_ORDER_FIRST, usb_dev_init_post, NULL);
static void
usb_dev_uninit(void *arg)
{
if (usb_dev != NULL) {
destroy_dev(usb_dev);
usb_dev = NULL;
}
mtx_destroy(&usb_ref_lock);
sx_destroy(&usb_sym_lock);
}
SYSUNINIT(usb_dev_uninit, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, usb_dev_uninit, NULL);
static int
usb_ioctl_f_sub(struct usb_fifo *f, u_long cmd, void *addr,
struct thread *td)
{
int error = 0;
switch (cmd) {
case FIODTYPE:
*(int *)addr = 0; /* character device */
break;
case FIONBIO:
/* handled by upper FS layer */
break;
case FIOASYNC:
if (*(int *)addr) {
if (f->async_p != NULL) {
error = EBUSY;
break;
}
f->async_p = USB_TD_GET_PROC(td);
} else {
f->async_p = NULL;
}
break;
/* XXX this is not the most general solution */
case TIOCSPGRP:
if (f->async_p == NULL) {
error = EINVAL;
break;
}
if (*(int *)addr != USB_PROC_GET_GID(f->async_p)) {
error = EPERM;
break;
}
break;
default:
return (ENOIOCTL);
}
DPRINTFN(3, "cmd 0x%lx = %d\n", cmd, error);
return (error);
}
/*------------------------------------------------------------------------*
* usb_ioctl - cdev callback
*------------------------------------------------------------------------*/
static int
usb_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int fflag, struct thread* td)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
int fflags;
int err;
DPRINTFN(2, "cmd=0x%lx\n", cmd);
err = devfs_get_cdevpriv((void **)&cpd);
if (err != 0)
return (err);
/*
* Performance optimisation: We try to check for IOCTL's that
* don't need the USB reference first. Then we grab the USB
* reference if we need it!
*/
err = usb_ref_device(cpd, &refs, 0 /* no uref */ );
if (err)
return (ENXIO);
fflags = cpd->fflags;
f = NULL; /* set default value */
err = ENOIOCTL; /* set default value */
if (fflags & FWRITE) {
f = refs.txfifo;
err = usb_ioctl_f_sub(f, cmd, addr, td);
}
if (fflags & FREAD) {
f = refs.rxfifo;
err = usb_ioctl_f_sub(f, cmd, addr, td);
}
KASSERT(f != NULL, ("fifo not found"));
if (err != ENOIOCTL)
goto done;
err = (f->methods->f_ioctl) (f, cmd, addr, fflags);
DPRINTFN(2, "f_ioctl cmd 0x%lx = %d\n", cmd, err);
if (err != ENOIOCTL)
goto done;
if (usb_usb_ref_device(cpd, &refs)) {
/* we lost the reference */
return (ENXIO);
}
err = (f->methods->f_ioctl_post) (f, cmd, addr, fflags);
DPRINTFN(2, "f_ioctl_post cmd 0x%lx = %d\n", cmd, err);
if (err == ENOIOCTL)
err = ENOTTY;
if (err)
goto done;
/* Wait for re-enumeration, if any */
while (f->udev->re_enumerate_wait != USB_RE_ENUM_DONE) {
usb_unref_device(cpd, &refs);
usb_pause_mtx(NULL, hz / 128);
while (usb_ref_device(cpd, &refs, 1 /* need uref */)) {
if (usb_ref_device(cpd, &refs, 0)) {
/* device no longer exists */
return (ENXIO);
}
usb_unref_device(cpd, &refs);
usb_pause_mtx(NULL, hz / 128);
}
}
done:
usb_unref_device(cpd, &refs);
return (err);
}
static void
usb_filter_detach(struct knote *kn)
{
struct usb_fifo *f = kn->kn_hook;
knlist_remove(&f->selinfo.si_note, kn, 0);
}
static int
usb_filter_write(struct knote *kn, long hint)
{
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
struct usb_mbuf *m;
DPRINTFN(2, "\n");
f = kn->kn_hook;
mtx_assert(f->priv_mtx, MA_OWNED);
cpd = f->curr_cpd;
if (cpd == NULL) {
m = (void *)1;
} else if (f->fs_ep_max == 0) {
if (f->flag_iserror) {
/* we got an error */
m = (void *)1;
} else {
if (f->queue_data == NULL) {
/*
* start write transfer, if not
* already started
*/
(f->methods->f_start_write) (f);
}
/* check if any packets are available */
USB_IF_POLL(&f->free_q, m);
}
} else {
if (f->flag_iscomplete) {
m = (void *)1;
} else {
m = NULL;
}
}
return (m ? 1 : 0);
}
static int
usb_filter_read(struct knote *kn, long hint)
{
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
struct usb_mbuf *m;
DPRINTFN(2, "\n");
f = kn->kn_hook;
mtx_assert(f->priv_mtx, MA_OWNED);
cpd = f->curr_cpd;
if (cpd == NULL) {
m = (void *)1;
} else if (f->fs_ep_max == 0) {
if (f->flag_iserror) {
/* we have an error */
m = (void *)1;
} else {
if (f->queue_data == NULL) {
/*
* start read transfer, if not
* already started
*/
(f->methods->f_start_read) (f);
}
/* check if any packets are available */
USB_IF_POLL(&f->used_q, m);
/* start reading data, if any */
if (m == NULL)
(f->methods->f_start_read) (f);
}
} else {
if (f->flag_iscomplete) {
m = (void *)1;
} else {
m = NULL;
}
}
return (m ? 1 : 0);
}
static struct filterops usb_filtops_write = {
.f_isfd = 1,
.f_detach = usb_filter_detach,
.f_event = usb_filter_write,
};
static struct filterops usb_filtops_read = {
.f_isfd = 1,
.f_detach = usb_filter_detach,
.f_event = usb_filter_read,
};
/* ARGSUSED */
static int
usb_kqfilter(struct cdev* dev, struct knote *kn)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
int fflags;
int err = EINVAL;
DPRINTFN(2, "\n");
if (devfs_get_cdevpriv((void **)&cpd) != 0 ||
usb_ref_device(cpd, &refs, 0) != 0)
return (ENXIO);
fflags = cpd->fflags;
/* Figure out who needs service */
switch (kn->kn_filter) {
case EVFILT_WRITE:
if (fflags & FWRITE) {
f = refs.txfifo;
kn->kn_fop = &usb_filtops_write;
err = 0;
}
break;
case EVFILT_READ:
if (fflags & FREAD) {
f = refs.rxfifo;
kn->kn_fop = &usb_filtops_read;
err = 0;
}
break;
default:
err = EOPNOTSUPP;
break;
}
if (err == 0) {
kn->kn_hook = f;
mtx_lock(f->priv_mtx);
knlist_add(&f->selinfo.si_note, kn, 1);
mtx_unlock(f->priv_mtx);
}
usb_unref_device(cpd, &refs);
return (err);
}
/* ARGSUSED */
static int
usb_poll(struct cdev* dev, int events, struct thread* td)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
struct usb_mbuf *m;
int fflags, revents;
if (devfs_get_cdevpriv((void **)&cpd) != 0 ||
usb_ref_device(cpd, &refs, 0) != 0)
return (events &
(POLLHUP|POLLIN|POLLRDNORM|POLLOUT|POLLWRNORM));
fflags = cpd->fflags;
/* Figure out who needs service */
revents = 0;
if ((events & (POLLOUT | POLLWRNORM)) &&
(fflags & FWRITE)) {
f = refs.txfifo;
mtx_lock(f->priv_mtx);
if (!refs.is_usbfs) {
if (f->flag_iserror) {
/* we got an error */
m = (void *)1;
} else {
if (f->queue_data == NULL) {
/*
* start write transfer, if not
* already started
*/
(f->methods->f_start_write) (f);
}
/* check if any packets are available */
USB_IF_POLL(&f->free_q, m);
}
} else {
if (f->flag_iscomplete) {
m = (void *)1;
} else {
m = NULL;
}
}
if (m) {
revents |= events & (POLLOUT | POLLWRNORM);
} else {
f->flag_isselect = 1;
selrecord(td, &f->selinfo);
}
mtx_unlock(f->priv_mtx);
}
if ((events & (POLLIN | POLLRDNORM)) &&
(fflags & FREAD)) {
f = refs.rxfifo;
mtx_lock(f->priv_mtx);
if (!refs.is_usbfs) {
if (f->flag_iserror) {
/* we have an error */
m = (void *)1;
} else {
if (f->queue_data == NULL) {
/*
* start read transfer, if not
* already started
*/
(f->methods->f_start_read) (f);
}
/* check if any packets are available */
USB_IF_POLL(&f->used_q, m);
}
} else {
if (f->flag_iscomplete) {
m = (void *)1;
} else {
m = NULL;
}
}
if (m) {
revents |= events & (POLLIN | POLLRDNORM);
} else {
f->flag_isselect = 1;
selrecord(td, &f->selinfo);
if (!refs.is_usbfs) {
/* start reading data */
(f->methods->f_start_read) (f);
}
}
mtx_unlock(f->priv_mtx);
}
usb_unref_device(cpd, &refs);
return (revents);
}
static int
usb_read(struct cdev *dev, struct uio *uio, int ioflag)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
struct usb_mbuf *m;
int fflags;
int resid;
int io_len;
int err;
uint8_t tr_data = 0;
err = devfs_get_cdevpriv((void **)&cpd);
if (err != 0)
return (err);
err = usb_ref_device(cpd, &refs, 0 /* no uref */ );
if (err)
return (ENXIO);
fflags = cpd->fflags;
f = refs.rxfifo;
if (f == NULL) {
/* should not happen */
usb_unref_device(cpd, &refs);
return (EPERM);
}
resid = uio->uio_resid;
mtx_lock(f->priv_mtx);
/* check for permanent read error */
if (f->flag_iserror) {
err = EIO;
goto done;
}
/* check if USB-FS interface is active */
if (refs.is_usbfs) {
/*
* The queue is used for events that should be
* retrieved using the "USB_FS_COMPLETE" ioctl.
*/
err = EINVAL;
goto done;
}
while (uio->uio_resid > 0) {
USB_IF_DEQUEUE(&f->used_q, m);
if (m == NULL) {
/* start read transfer, if not already started */
(f->methods->f_start_read) (f);
if (ioflag & IO_NDELAY) {
if (tr_data) {
/* return length before error */
break;
}
err = EWOULDBLOCK;
break;
}
DPRINTF("sleeping\n");
err = usb_fifo_wait(f);
if (err) {
break;
}
continue;
}
if (f->methods->f_filter_read) {
/*
* Sometimes it is convenient to process data at the
* expense of a userland process instead of a kernel
* process.
*/
(f->methods->f_filter_read) (f, m);
}
tr_data = 1;
io_len = MIN(m->cur_data_len, uio->uio_resid);
DPRINTFN(2, "transfer %d bytes from %p\n",
io_len, m->cur_data_ptr);
err = usb_fifo_uiomove(f,
m->cur_data_ptr, io_len, uio);
m->cur_data_len -= io_len;
m->cur_data_ptr += io_len;
if (m->cur_data_len == 0) {
uint8_t last_packet;
last_packet = m->last_packet;
USB_IF_ENQUEUE(&f->free_q, m);
if (last_packet) {
/* keep framing */
break;
}
} else {
USB_IF_PREPEND(&f->used_q, m);
}
if (err) {
break;
}
}
done:
mtx_unlock(f->priv_mtx);
usb_unref_device(cpd, &refs);
return (err);
}
static int
usb_write(struct cdev *dev, struct uio *uio, int ioflag)
{
struct usb_cdev_refdata refs;
struct usb_cdev_privdata* cpd;
struct usb_fifo *f;
struct usb_mbuf *m;
uint8_t *pdata;
int fflags;
int resid;
int io_len;
int err;
uint8_t tr_data = 0;
DPRINTFN(2, "\n");
err = devfs_get_cdevpriv((void **)&cpd);
if (err != 0)
return (err);
err = usb_ref_device(cpd, &refs, 0 /* no uref */ );
if (err)
return (ENXIO);
fflags = cpd->fflags;
f = refs.txfifo;
if (f == NULL) {
/* should not happen */
usb_unref_device(cpd, &refs);
return (EPERM);
}
resid = uio->uio_resid;
mtx_lock(f->priv_mtx);
/* check for permanent write error */
if (f->flag_iserror) {
err = EIO;
goto done;
}
/* check if USB-FS interface is active */
if (refs.is_usbfs) {
/*
* The queue is used for events that should be
* retrieved using the "USB_FS_COMPLETE" ioctl.
*/
err = EINVAL;
goto done;
}
if (f->queue_data == NULL) {
/* start write transfer, if not already started */
(f->methods->f_start_write) (f);
}
/* we allow writing zero length data */
do {
USB_IF_DEQUEUE(&f->free_q, m);
if (m == NULL) {
if (ioflag & IO_NDELAY) {
if (tr_data) {
/* return length before error */
break;
}
err = EWOULDBLOCK;
break;
}
DPRINTF("sleeping\n");
err = usb_fifo_wait(f);
if (err) {
break;
}
continue;
}
tr_data = 1;
if (f->flag_have_fragment == 0) {
USB_MBUF_RESET(m);
io_len = m->cur_data_len;
pdata = m->cur_data_ptr;
if (io_len > uio->uio_resid)
io_len = uio->uio_resid;
m->cur_data_len = io_len;
} else {
io_len = m->max_data_len - m->cur_data_len;
pdata = m->cur_data_ptr + m->cur_data_len;
if (io_len > uio->uio_resid)
io_len = uio->uio_resid;
m->cur_data_len += io_len;
}
DPRINTFN(2, "transfer %d bytes to %p\n",
io_len, pdata);
err = usb_fifo_uiomove(f, pdata, io_len, uio);
if (err) {
f->flag_have_fragment = 0;
USB_IF_ENQUEUE(&f->free_q, m);
break;
}
/* check if the buffer is ready to be transmitted */
if ((f->flag_write_defrag == 0) ||
(m->cur_data_len == m->max_data_len)) {
f->flag_have_fragment = 0;
/*
* Check for write filter:
*
* Sometimes it is convenient to process data
* at the expense of a userland process
* instead of a kernel process.
*/
if (f->methods->f_filter_write) {
(f->methods->f_filter_write) (f, m);
}
/* Put USB mbuf in the used queue */
USB_IF_ENQUEUE(&f->used_q, m);
/* Start writing data, if not already started */
(f->methods->f_start_write) (f);
} else {
/* Wait for more data or close */
f->flag_have_fragment = 1;
USB_IF_PREPEND(&f->free_q, m);
}
} while (uio->uio_resid > 0);
done:
mtx_unlock(f->priv_mtx);
usb_unref_device(cpd, &refs);
return (err);
}
int
usb_static_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
union {
struct usb_read_dir *urd;
void* data;
} u;
int err;
u.data = data;
switch (cmd) {
case USB_READ_DIR:
err = usb_read_symlink(u.urd->urd_data,
u.urd->urd_startentry, u.urd->urd_maxlen);
break;
case USB_DEV_QUIRK_GET:
case USB_QUIRK_NAME_GET:
case USB_DEV_QUIRK_ADD:
case USB_DEV_QUIRK_REMOVE:
err = usb_quirk_ioctl_p(cmd, data, fflag, td);
break;
case USB_GET_TEMPLATE:
*(int *)data = usb_template;
err = 0;
break;
case USB_SET_TEMPLATE:
err = priv_check(curthread, PRIV_DRIVER);
if (err)
break;
usb_template = *(int *)data;
break;
default:
err = ENOTTY;
break;
}
return (err);
}
static int
usb_fifo_uiomove(struct usb_fifo *f, void *cp,
int n, struct uio *uio)
{
int error;
mtx_unlock(f->priv_mtx);
/*
* "uiomove()" can sleep so one needs to make a wrapper,
* exiting the mutex and checking things:
*/
error = uiomove(cp, n, uio);
mtx_lock(f->priv_mtx);
return (error);
}
int
usb_fifo_wait(struct usb_fifo *f)
{
int err;
mtx_assert(f->priv_mtx, MA_OWNED);
if (f->flag_iserror) {
/* we are gone */
return (EIO);
}
f->flag_sleeping = 1;
err = cv_wait_sig(&f->cv_io, f->priv_mtx);
if (f->flag_iserror) {
/* we are gone */
err = EIO;
}
return (err);
}
void
usb_fifo_signal(struct usb_fifo *f)
{
if (f->flag_sleeping) {
f->flag_sleeping = 0;
cv_broadcast(&f->cv_io);
}
}
void
usb_fifo_wakeup(struct usb_fifo *f)
{
usb_fifo_signal(f);
KNOTE_LOCKED(&f->selinfo.si_note, 0);
if (f->flag_isselect) {
selwakeup(&f->selinfo);
f->flag_isselect = 0;
}
if (f->async_p != NULL) {
PROC_LOCK(f->async_p);
kern_psignal(f->async_p, SIGIO);
PROC_UNLOCK(f->async_p);
}
}
static int
usb_fifo_dummy_open(struct usb_fifo *fifo, int fflags)
{
return (0);
}
static void
usb_fifo_dummy_close(struct usb_fifo *fifo, int fflags)
{
return;
}
static int
usb_fifo_dummy_ioctl(struct usb_fifo *fifo, u_long cmd, void *addr, int fflags)
{
return (ENOIOCTL);
}
static void
usb_fifo_dummy_cmd(struct usb_fifo *fifo)
{
fifo->flag_flushing = 0; /* not flushing */
}
static void
usb_fifo_check_methods(struct usb_fifo_methods *pm)
{
/* check that all callback functions are OK */
if (pm->f_open == NULL)
pm->f_open = &usb_fifo_dummy_open;
if (pm->f_close == NULL)
pm->f_close = &usb_fifo_dummy_close;
if (pm->f_ioctl == NULL)
pm->f_ioctl = &usb_fifo_dummy_ioctl;
if (pm->f_ioctl_post == NULL)
pm->f_ioctl_post = &usb_fifo_dummy_ioctl;
if (pm->f_start_read == NULL)
pm->f_start_read = &usb_fifo_dummy_cmd;
if (pm->f_stop_read == NULL)
pm->f_stop_read = &usb_fifo_dummy_cmd;
if (pm->f_start_write == NULL)
pm->f_start_write = &usb_fifo_dummy_cmd;
if (pm->f_stop_write == NULL)
pm->f_stop_write = &usb_fifo_dummy_cmd;
}
/*------------------------------------------------------------------------*
* usb_fifo_attach
*
* The following function will create a duplex FIFO.
*
* Return values:
* 0: Success.
* Else: Failure.
*------------------------------------------------------------------------*/
int
usb_fifo_attach(struct usb_device *udev, void *priv_sc,
struct mtx *priv_mtx, struct usb_fifo_methods *pm,
struct usb_fifo_sc *f_sc, uint16_t unit, int16_t subunit,
uint8_t iface_index, uid_t uid, gid_t gid, int mode)
{
struct usb_fifo *f_tx;
struct usb_fifo *f_rx;
char devname[32];
uint8_t n;
f_sc->fp[USB_FIFO_TX] = NULL;
f_sc->fp[USB_FIFO_RX] = NULL;
if (pm == NULL)
return (EINVAL);
/* check the methods */
usb_fifo_check_methods(pm);
if (priv_mtx == NULL)
priv_mtx = &Giant;
/* search for a free FIFO slot */
for (n = 0;; n += 2) {
if (n == USB_FIFO_MAX) {
/* end of FIFOs reached */
return (ENOMEM);
}
/* Check for TX FIFO */
if (udev->fifo[n + USB_FIFO_TX] != NULL) {
continue;
}
/* Check for RX FIFO */
if (udev->fifo[n + USB_FIFO_RX] != NULL) {
continue;
}
break;
}
f_tx = usb_fifo_alloc(priv_mtx);
f_rx = usb_fifo_alloc(priv_mtx);
if ((f_tx == NULL) || (f_rx == NULL)) {
usb_fifo_free(f_tx);
usb_fifo_free(f_rx);
return (ENOMEM);
}
/* initialise FIFO structures */
f_tx->fifo_index = n + USB_FIFO_TX;
f_tx->dev_ep_index = -1;
f_tx->priv_sc0 = priv_sc;
f_tx->methods = pm;
f_tx->iface_index = iface_index;
f_tx->udev = udev;
f_rx->fifo_index = n + USB_FIFO_RX;
f_rx->dev_ep_index = -1;
f_rx->priv_sc0 = priv_sc;
f_rx->methods = pm;
f_rx->iface_index = iface_index;
f_rx->udev = udev;
f_sc->fp[USB_FIFO_TX] = f_tx;
f_sc->fp[USB_FIFO_RX] = f_rx;
mtx_lock(&usb_ref_lock);
udev->fifo[f_tx->fifo_index] = f_tx;
udev->fifo[f_rx->fifo_index] = f_rx;
mtx_unlock(&usb_ref_lock);
for (n = 0; n != 4; n++) {
if (pm->basename[n] == NULL) {
continue;
}
if (subunit < 0) {
if (snprintf(devname, sizeof(devname),
"%s%u%s", pm->basename[n],
unit, pm->postfix[n] ?
pm->postfix[n] : "")) {
/* ignore */
}
} else {
if (snprintf(devname, sizeof(devname),
"%s%u.%d%s", pm->basename[n],
unit, subunit, pm->postfix[n] ?
pm->postfix[n] : "")) {
/* ignore */
}
}
/*
* Distribute the symbolic links into two FIFO structures:
*/
if (n & 1) {
f_rx->symlink[n / 2] =
usb_alloc_symlink(devname);
} else {
f_tx->symlink[n / 2] =
usb_alloc_symlink(devname);
}
/* Create the device */
f_sc->dev = usb_make_dev(udev, devname, -1,
f_tx->fifo_index & f_rx->fifo_index,
FREAD|FWRITE, uid, gid, mode);
}
DPRINTFN(2, "attached %p/%p\n", f_tx, f_rx);
return (0);
}
/*------------------------------------------------------------------------*
* usb_fifo_alloc_buffer
*
* Return values:
* 0: Success
* Else failure
*------------------------------------------------------------------------*/
int
usb_fifo_alloc_buffer(struct usb_fifo *f, usb_size_t bufsize,
uint16_t nbuf)
{
usb_fifo_free_buffer(f);
/* allocate an endpoint */
f->free_q.ifq_maxlen = nbuf;
f->used_q.ifq_maxlen = nbuf;
f->queue_data = usb_alloc_mbufs(
M_USBDEV, &f->free_q, bufsize, nbuf);
if ((f->queue_data == NULL) && bufsize && nbuf) {
return (ENOMEM);
}
return (0); /* success */
}
/*------------------------------------------------------------------------*
* usb_fifo_free_buffer
*
* This function will free the buffers associated with a FIFO. This
* function can be called multiple times in a row.
*------------------------------------------------------------------------*/
void
usb_fifo_free_buffer(struct usb_fifo *f)
{
if (f->queue_data) {
/* free old buffer */
free(f->queue_data, M_USBDEV);
f->queue_data = NULL;
}
/* reset queues */
memset(&f->free_q, 0, sizeof(f->free_q));
memset(&f->used_q, 0, sizeof(f->used_q));
}
void
usb_fifo_detach(struct usb_fifo_sc *f_sc)
{
if (f_sc == NULL) {
return;
}
usb_fifo_free(f_sc->fp[USB_FIFO_TX]);
usb_fifo_free(f_sc->fp[USB_FIFO_RX]);
f_sc->fp[USB_FIFO_TX] = NULL;
f_sc->fp[USB_FIFO_RX] = NULL;
usb_destroy_dev(f_sc->dev);
f_sc->dev = NULL;
DPRINTFN(2, "detached %p\n", f_sc);
}
usb_size_t
usb_fifo_put_bytes_max(struct usb_fifo *f)
{
struct usb_mbuf *m;
usb_size_t len;
USB_IF_POLL(&f->free_q, m);
if (m) {
len = m->max_data_len;
} else {
len = 0;
}
return (len);
}
/*------------------------------------------------------------------------*
* usb_fifo_put_data
*
* what:
* 0 - normal operation
* 1 - set last packet flag to enforce framing
*------------------------------------------------------------------------*/
void
usb_fifo_put_data(struct usb_fifo *f, struct usb_page_cache *pc,
usb_frlength_t offset, usb_frlength_t len, uint8_t what)
{
struct usb_mbuf *m;
usb_frlength_t io_len;
while (len || (what == 1)) {
USB_IF_DEQUEUE(&f->free_q, m);
if (m) {
USB_MBUF_RESET(m);
io_len = MIN(len, m->cur_data_len);
usbd_copy_out(pc, offset, m->cur_data_ptr, io_len);
m->cur_data_len = io_len;
offset += io_len;
len -= io_len;
if ((len == 0) && (what == 1)) {
m->last_packet = 1;
}
USB_IF_ENQUEUE(&f->used_q, m);
usb_fifo_wakeup(f);
if ((len == 0) || (what == 1)) {
break;
}
} else {
break;
}
}
}
void
usb_fifo_put_data_linear(struct usb_fifo *f, void *ptr,
usb_size_t len, uint8_t what)
{
struct usb_mbuf *m;
usb_size_t io_len;
while (len || (what == 1)) {
USB_IF_DEQUEUE(&f->free_q, m);
if (m) {
USB_MBUF_RESET(m);
io_len = MIN(len, m->cur_data_len);
memcpy(m->cur_data_ptr, ptr, io_len);
m->cur_data_len = io_len;
ptr = USB_ADD_BYTES(ptr, io_len);
len -= io_len;
if ((len == 0) && (what == 1)) {
m->last_packet = 1;
}
USB_IF_ENQUEUE(&f->used_q, m);
usb_fifo_wakeup(f);
if ((len == 0) || (what == 1)) {
break;
}
} else {
break;
}
}
}
uint8_t
usb_fifo_put_data_buffer(struct usb_fifo *f, void *ptr, usb_size_t len)
{
struct usb_mbuf *m;
USB_IF_DEQUEUE(&f->free_q, m);
if (m) {
m->cur_data_len = len;
m->cur_data_ptr = ptr;
USB_IF_ENQUEUE(&f->used_q, m);
usb_fifo_wakeup(f);
return (1);
}
return (0);
}
void
usb_fifo_put_data_error(struct usb_fifo *f)
{
f->flag_iserror = 1;
usb_fifo_wakeup(f);
}
/*------------------------------------------------------------------------*
* usb_fifo_get_data
*
* what:
* 0 - normal operation
* 1 - only get one "usb_mbuf"
*
* returns:
* 0 - no more data
* 1 - data in buffer
*------------------------------------------------------------------------*/
uint8_t
usb_fifo_get_data(struct usb_fifo *f, struct usb_page_cache *pc,
usb_frlength_t offset, usb_frlength_t len, usb_frlength_t *actlen,
uint8_t what)
{
struct usb_mbuf *m;
usb_frlength_t io_len;
uint8_t tr_data = 0;
actlen[0] = 0;
while (1) {
USB_IF_DEQUEUE(&f->used_q, m);
if (m) {
tr_data = 1;
io_len = MIN(len, m->cur_data_len);
usbd_copy_in(pc, offset, m->cur_data_ptr, io_len);
len -= io_len;
offset += io_len;
actlen[0] += io_len;
m->cur_data_ptr += io_len;
m->cur_data_len -= io_len;
if ((m->cur_data_len == 0) || (what == 1)) {
USB_IF_ENQUEUE(&f->free_q, m);
usb_fifo_wakeup(f);
if (what == 1) {
break;
}
} else {
USB_IF_PREPEND(&f->used_q, m);
}
} else {
if (tr_data) {
/* wait for data to be written out */
break;
}
if (f->flag_flushing) {
/* check if we should send a short packet */
if (f->flag_short != 0) {
f->flag_short = 0;
tr_data = 1;
break;
}
/* flushing complete */
f->flag_flushing = 0;
usb_fifo_wakeup(f);
}
break;
}
if (len == 0) {
break;
}
}
return (tr_data);
}
uint8_t
usb_fifo_get_data_linear(struct usb_fifo *f, void *ptr,
usb_size_t len, usb_size_t *actlen, uint8_t what)
{
struct usb_mbuf *m;
usb_size_t io_len;
uint8_t tr_data = 0;
actlen[0] = 0;
while (1) {
USB_IF_DEQUEUE(&f->used_q, m);
if (m) {
tr_data = 1;
io_len = MIN(len, m->cur_data_len);
memcpy(ptr, m->cur_data_ptr, io_len);
len -= io_len;
ptr = USB_ADD_BYTES(ptr, io_len);
actlen[0] += io_len;
m->cur_data_ptr += io_len;
m->cur_data_len -= io_len;
if ((m->cur_data_len == 0) || (what == 1)) {
USB_IF_ENQUEUE(&f->free_q, m);
usb_fifo_wakeup(f);
if (what == 1) {
break;
}
} else {
USB_IF_PREPEND(&f->used_q, m);
}
} else {
if (tr_data) {
/* wait for data to be written out */
break;
}
if (f->flag_flushing) {
/* check if we should send a short packet */
if (f->flag_short != 0) {
f->flag_short = 0;
tr_data = 1;
break;
}
/* flushing complete */
f->flag_flushing = 0;
usb_fifo_wakeup(f);
}
break;
}
if (len == 0) {
break;
}
}
return (tr_data);
}
uint8_t
usb_fifo_get_data_buffer(struct usb_fifo *f, void **pptr, usb_size_t *plen)
{
struct usb_mbuf *m;
USB_IF_POLL(&f->used_q, m);
if (m) {
*plen = m->cur_data_len;
*pptr = m->cur_data_ptr;
return (1);
}
return (0);
}
void
usb_fifo_get_data_error(struct usb_fifo *f)
{
f->flag_iserror = 1;
usb_fifo_wakeup(f);
}
/*------------------------------------------------------------------------*
* usb_alloc_symlink
*
* Return values:
* NULL: Failure
* Else: Pointer to symlink entry
*------------------------------------------------------------------------*/
struct usb_symlink *
usb_alloc_symlink(const char *target)
{
struct usb_symlink *ps;
ps = malloc(sizeof(*ps), M_USBDEV, M_WAITOK);
if (ps == NULL) {
return (ps);
}
/* XXX no longer needed */
strlcpy(ps->src_path, target, sizeof(ps->src_path));
ps->src_len = strlen(ps->src_path);
strlcpy(ps->dst_path, target, sizeof(ps->dst_path));
ps->dst_len = strlen(ps->dst_path);
sx_xlock(&usb_sym_lock);
TAILQ_INSERT_TAIL(&usb_sym_head, ps, sym_entry);
sx_unlock(&usb_sym_lock);
return (ps);
}
/*------------------------------------------------------------------------*
* usb_free_symlink
*------------------------------------------------------------------------*/
void
usb_free_symlink(struct usb_symlink *ps)
{
if (ps == NULL) {
return;
}
sx_xlock(&usb_sym_lock);
TAILQ_REMOVE(&usb_sym_head, ps, sym_entry);
sx_unlock(&usb_sym_lock);
free(ps, M_USBDEV);
}
/*------------------------------------------------------------------------*
* usb_read_symlink
*
* Return value:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
int
usb_read_symlink(uint8_t *user_ptr, uint32_t startentry, uint32_t user_len)
{
struct usb_symlink *ps;
uint32_t temp;
uint32_t delta = 0;
uint8_t len;
int error = 0;
sx_xlock(&usb_sym_lock);
TAILQ_FOREACH(ps, &usb_sym_head, sym_entry) {
/*
* Compute total length of source and destination symlink
* strings pluss one length byte and two NUL bytes:
*/
temp = ps->src_len + ps->dst_len + 3;
if (temp > 255) {
/*
* Skip entry because this length cannot fit
* into one byte:
*/
continue;
}
if (startentry != 0) {
/* decrement read offset */
startentry--;
continue;
}
if (temp > user_len) {
/* out of buffer space */
break;
}
len = temp;
/* copy out total length */
error = copyout(&len,
USB_ADD_BYTES(user_ptr, delta), 1);
if (error) {
break;
}
delta += 1;
/* copy out source string */
error = copyout(ps->src_path,
USB_ADD_BYTES(user_ptr, delta), ps->src_len);
if (error) {
break;
}
len = 0;
delta += ps->src_len;
error = copyout(&len,
USB_ADD_BYTES(user_ptr, delta), 1);
if (error) {
break;
}
delta += 1;
/* copy out destination string */
error = copyout(ps->dst_path,
USB_ADD_BYTES(user_ptr, delta), ps->dst_len);
if (error) {
break;
}
len = 0;
delta += ps->dst_len;
error = copyout(&len,
USB_ADD_BYTES(user_ptr, delta), 1);
if (error) {
break;
}
delta += 1;
user_len -= temp;
}
/* a zero length entry indicates the end */
if ((user_len != 0) && (error == 0)) {
len = 0;
error = copyout(&len,
USB_ADD_BYTES(user_ptr, delta), 1);
}
sx_unlock(&usb_sym_lock);
return (error);
}
void
usb_fifo_set_close_zlp(struct usb_fifo *f, uint8_t onoff)
{
if (f == NULL)
return;
/* send a Zero Length Packet, ZLP, before close */
f->flag_short = onoff;
}
void
usb_fifo_set_write_defrag(struct usb_fifo *f, uint8_t onoff)
{
if (f == NULL)
return;
/* defrag written data */
f->flag_write_defrag = onoff;
/* reset defrag state */
f->flag_have_fragment = 0;
}
void *
usb_fifo_softc(struct usb_fifo *f)
{
return (f->priv_sc0);
}
#endif /* USB_HAVE_UGEN */
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