d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
f947570e35
freebsd-nq/sys/dev/usb/usb_hub.c
Nick Hibma 16bf0e5da1 Fix the ordering of the arguments to printf in 
uhub_child_location_string(). This produced bogus information in

	dev.<USB driver>.<id>.%location

output from sysctl.

MFC after:	2 weeks
2014-01-29 16:24:50 +00:00

2802 lines
67 KiB
C
Raw Blame History

/* $FreeBSD$ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc. All rights reserved.
* Copyright (c) 1998 Lennart Augustsson. All rights reserved.
* Copyright (c) 2008-2010 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 spec: http://www.usb.org/developers/docs/usbspec.zip
*/
#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 <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#define USB_DEBUG_VAR uhub_debug
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_request.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_hub.h>
#include <dev/usb/usb_util.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_transfer.h>
#include <dev/usb/usb_dynamic.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#endif /* USB_GLOBAL_INCLUDE_FILE */
#define UHUB_INTR_INTERVAL 250 /* ms */
enum {
UHUB_INTR_TRANSFER,
#if USB_HAVE_TT_SUPPORT
UHUB_RESET_TT_TRANSFER,
#endif
UHUB_N_TRANSFER,
};
#ifdef USB_DEBUG
static int uhub_debug = 0;
static SYSCTL_NODE(_hw_usb, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB HUB");
SYSCTL_INT(_hw_usb_uhub, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_TUN, &uhub_debug, 0,
"Debug level");
TUNABLE_INT("hw.usb.uhub.debug", &uhub_debug);
#endif
#if USB_HAVE_POWERD
static int usb_power_timeout = 30; /* seconds */
SYSCTL_INT(_hw_usb, OID_AUTO, power_timeout, CTLFLAG_RW,
&usb_power_timeout, 0, "USB power timeout");
#endif
struct uhub_current_state {
uint16_t port_change;
uint16_t port_status;
};
struct uhub_softc {
struct uhub_current_state sc_st;/* current state */
#if (USB_HAVE_FIXED_PORT != 0)
struct usb_hub sc_hub;
#endif
device_t sc_dev; /* base device */
struct mtx sc_mtx; /* our mutex */
struct usb_device *sc_udev; /* USB device */
struct usb_xfer *sc_xfer[UHUB_N_TRANSFER]; /* interrupt xfer */
uint8_t sc_flags;
#define UHUB_FLAG_DID_EXPLORE 0x01
};
#define UHUB_PROTO(sc) ((sc)->sc_udev->ddesc.bDeviceProtocol)
#define UHUB_IS_HIGH_SPEED(sc) (UHUB_PROTO(sc) != UDPROTO_FSHUB)
#define UHUB_IS_SINGLE_TT(sc) (UHUB_PROTO(sc) == UDPROTO_HSHUBSTT)
#define UHUB_IS_MULTI_TT(sc) (UHUB_PROTO(sc) == UDPROTO_HSHUBMTT)
#define UHUB_IS_SUPER_SPEED(sc) (UHUB_PROTO(sc) == UDPROTO_SSHUB)
/* prototypes for type checking: */
static device_probe_t uhub_probe;
static device_attach_t uhub_attach;
static device_detach_t uhub_detach;
static device_suspend_t uhub_suspend;
static device_resume_t uhub_resume;
static bus_driver_added_t uhub_driver_added;
static bus_child_location_str_t uhub_child_location_string;
static bus_child_pnpinfo_str_t uhub_child_pnpinfo_string;
static usb_callback_t uhub_intr_callback;
#if USB_HAVE_TT_SUPPORT
static usb_callback_t uhub_reset_tt_callback;
#endif
static void usb_dev_resume_peer(struct usb_device *udev);
static void usb_dev_suspend_peer(struct usb_device *udev);
static uint8_t usb_peer_should_wakeup(struct usb_device *udev);
static const struct usb_config uhub_config[UHUB_N_TRANSFER] = {
[UHUB_INTR_TRANSFER] = {
.type = UE_INTERRUPT,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_ANY,
.timeout = 0,
.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
.bufsize = 0, /* use wMaxPacketSize */
.callback = &uhub_intr_callback,
.interval = UHUB_INTR_INTERVAL,
},
#if USB_HAVE_TT_SUPPORT
[UHUB_RESET_TT_TRANSFER] = {
.type = UE_CONTROL,
.endpoint = 0x00, /* Control pipe */
.direction = UE_DIR_ANY,
.bufsize = sizeof(struct usb_device_request),
.callback = &uhub_reset_tt_callback,
.timeout = 1000, /* 1 second */
.usb_mode = USB_MODE_HOST,
},
#endif
};
/*
* driver instance for "hub" connected to "usb"
* and "hub" connected to "hub"
*/
static devclass_t uhub_devclass;
static device_method_t uhub_methods[] = {
DEVMETHOD(device_probe, uhub_probe),
DEVMETHOD(device_attach, uhub_attach),
DEVMETHOD(device_detach, uhub_detach),
DEVMETHOD(device_suspend, uhub_suspend),
DEVMETHOD(device_resume, uhub_resume),
DEVMETHOD(bus_child_location_str, uhub_child_location_string),
DEVMETHOD(bus_child_pnpinfo_str, uhub_child_pnpinfo_string),
DEVMETHOD(bus_driver_added, uhub_driver_added),
DEVMETHOD_END
};
static driver_t uhub_driver = {
.name = "uhub",
.methods = uhub_methods,
.size = sizeof(struct uhub_softc)
};
DRIVER_MODULE(uhub, usbus, uhub_driver, uhub_devclass, 0, 0);
DRIVER_MODULE(uhub, uhub, uhub_driver, uhub_devclass, NULL, 0);
MODULE_VERSION(uhub, 1);
static void
uhub_intr_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct uhub_softc *sc = usbd_xfer_softc(xfer);
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
DPRINTFN(2, "\n");
/*
* This is an indication that some port
* has changed status. Notify the bus
* event handler thread that we need
* to be explored again:
*/
usb_needs_explore(sc->sc_udev->bus, 0);
case USB_ST_SETUP:
usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
usbd_transfer_submit(xfer);
break;
default: /* Error */
if (xfer->error != USB_ERR_CANCELLED) {
/*
* Do a clear-stall. The "stall_pipe" flag
* will get cleared before next callback by
* the USB stack.
*/
usbd_xfer_set_stall(xfer);
usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
usbd_transfer_submit(xfer);
}
break;
}
}
/*------------------------------------------------------------------------*
* uhub_reset_tt_proc
*
* This function starts the TT reset USB request
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
static void
uhub_reset_tt_proc(struct usb_proc_msg *_pm)
{
struct usb_udev_msg *pm = (void *)_pm;
struct usb_device *udev = pm->udev;
struct usb_hub *hub;
struct uhub_softc *sc;
hub = udev->hub;
if (hub == NULL)
return;
sc = hub->hubsoftc;
if (sc == NULL)
return;
/* Change lock */
USB_BUS_UNLOCK(udev->bus);
mtx_lock(&sc->sc_mtx);
/* Start transfer */
usbd_transfer_start(sc->sc_xfer[UHUB_RESET_TT_TRANSFER]);
/* Change lock */
mtx_unlock(&sc->sc_mtx);
USB_BUS_LOCK(udev->bus);
}
#endif
/*------------------------------------------------------------------------*
* uhub_tt_buffer_reset_async_locked
*
* This function queues a TT reset for the given USB device and endpoint.
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
void
uhub_tt_buffer_reset_async_locked(struct usb_device *child, struct usb_endpoint *ep)
{
struct usb_device_request req;
struct usb_device *udev;
struct usb_hub *hub;
struct usb_port *up;
uint16_t wValue;
uint8_t port;
if (child == NULL || ep == NULL)
return;
udev = child->parent_hs_hub;
port = child->hs_port_no;
if (udev == NULL)
return;
hub = udev->hub;
if ((hub == NULL) ||
(udev->speed != USB_SPEED_HIGH) ||
(child->speed != USB_SPEED_LOW &&
child->speed != USB_SPEED_FULL) ||
(child->flags.usb_mode != USB_MODE_HOST) ||
(port == 0) || (ep->edesc == NULL)) {
/* not applicable */
return;
}
USB_BUS_LOCK_ASSERT(udev->bus, MA_OWNED);
up = hub->ports + port - 1;
if (udev->ddesc.bDeviceClass == UDCLASS_HUB &&
udev->ddesc.bDeviceProtocol == UDPROTO_HSHUBSTT)
port = 1;
/* if we already received a clear buffer request, reset the whole TT */
if (up->req_reset_tt.bRequest != 0) {
req.bmRequestType = UT_WRITE_CLASS_OTHER;
req.bRequest = UR_RESET_TT;
USETW(req.wValue, 0);
req.wIndex[0] = port;
req.wIndex[1] = 0;
USETW(req.wLength, 0);
} else {
wValue = (ep->edesc->bEndpointAddress & 0xF) |
((child->address & 0x7F) << 4) |
((ep->edesc->bEndpointAddress & 0x80) << 8) |
((ep->edesc->bmAttributes & 3) << 12);
req.bmRequestType = UT_WRITE_CLASS_OTHER;
req.bRequest = UR_CLEAR_TT_BUFFER;
USETW(req.wValue, wValue);
req.wIndex[0] = port;
req.wIndex[1] = 0;
USETW(req.wLength, 0);
}
up->req_reset_tt = req;
/* get reset transfer started */
usb_proc_msignal(USB_BUS_NON_GIANT_PROC(udev->bus),
&hub->tt_msg[0], &hub->tt_msg[1]);
}
#endif
#if USB_HAVE_TT_SUPPORT
static void
uhub_reset_tt_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct uhub_softc *sc;
struct usb_device *udev;
struct usb_port *up;
uint8_t x;
DPRINTF("TT buffer reset\n");
sc = usbd_xfer_softc(xfer);
udev = sc->sc_udev;
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
case USB_ST_SETUP:
tr_setup:
USB_BUS_LOCK(udev->bus);
/* find first port which needs a TT reset */
for (x = 0; x != udev->hub->nports; x++) {
up = udev->hub->ports + x;
if (up->req_reset_tt.bRequest == 0)
continue;
/* copy in the transfer */
usbd_copy_in(xfer->frbuffers, 0, &up->req_reset_tt,
sizeof(up->req_reset_tt));
/* reset buffer */
memset(&up->req_reset_tt, 0, sizeof(up->req_reset_tt));
/* set length */
usbd_xfer_set_frame_len(xfer, 0, sizeof(up->req_reset_tt));
xfer->nframes = 1;
USB_BUS_UNLOCK(udev->bus);
usbd_transfer_submit(xfer);
return;
}
USB_BUS_UNLOCK(udev->bus);
break;
default:
if (error == USB_ERR_CANCELLED)
break;
DPRINTF("TT buffer reset failed (%s)\n", usbd_errstr(error));
goto tr_setup;
}
}
#endif
/*------------------------------------------------------------------------*
* uhub_count_active_host_ports
*
* This function counts the number of active ports at the given speed.
*------------------------------------------------------------------------*/
uint8_t
uhub_count_active_host_ports(struct usb_device *udev, enum usb_dev_speed speed)
{
struct uhub_softc *sc;
struct usb_device *child;
struct usb_hub *hub;
struct usb_port *up;
uint8_t retval = 0;
uint8_t x;
if (udev == NULL)
goto done;
hub = udev->hub;
if (hub == NULL)
goto done;
sc = hub->hubsoftc;
if (sc == NULL)
goto done;
for (x = 0; x != hub->nports; x++) {
up = hub->ports + x;
child = usb_bus_port_get_device(udev->bus, up);
if (child != NULL &&
child->flags.usb_mode == USB_MODE_HOST &&
child->speed == speed)
retval++;
}
done:
return (retval);
}
/*------------------------------------------------------------------------*
* uhub_explore_sub - subroutine
*
* Return values:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb_error_t
uhub_explore_sub(struct uhub_softc *sc, struct usb_port *up)
{
struct usb_bus *bus;
struct usb_device *child;
uint8_t refcount;
usb_error_t err;
bus = sc->sc_udev->bus;
err = 0;
/* get driver added refcount from USB bus */
refcount = bus->driver_added_refcount;
/* get device assosiated with the given port */
child = usb_bus_port_get_device(bus, up);
if (child == NULL) {
/* nothing to do */
goto done;
}
/* check if device should be re-enumerated */
if (child->flags.usb_mode == USB_MODE_HOST) {
uint8_t do_unlock;
do_unlock = usbd_enum_lock(child);
switch (child->re_enumerate_wait) {
case USB_RE_ENUM_START:
err = usbd_set_config_index(child,
USB_UNCONFIG_INDEX);
if (err != 0) {
DPRINTF("Unconfigure failed: "
"%s: Ignored.\n",
usbd_errstr(err));
}
err = usbd_req_re_enumerate(child, NULL);
if (err == 0)
err = usbd_set_config_index(child, 0);
if (err == 0) {
err = usb_probe_and_attach(child,
USB_IFACE_INDEX_ANY);
}
child->re_enumerate_wait = USB_RE_ENUM_DONE;
err = 0;
break;
case USB_RE_ENUM_PWR_OFF:
/* get the device unconfigured */
err = usbd_set_config_index(child,
USB_UNCONFIG_INDEX);
if (err) {
DPRINTFN(0, "Could not unconfigure "
"device (ignored)\n");
}
/* clear port enable */
err = usbd_req_clear_port_feature(child->parent_hub,
NULL, child->port_no, UHF_PORT_ENABLE);
if (err) {
DPRINTFN(0, "Could not disable port "
"(ignored)\n");
}
child->re_enumerate_wait = USB_RE_ENUM_DONE;
err = 0;
break;
default:
child->re_enumerate_wait = USB_RE_ENUM_DONE;
break;
}
if (do_unlock)
usbd_enum_unlock(child);
}
/* check if probe and attach should be done */
if (child->driver_added_refcount != refcount) {
child->driver_added_refcount = refcount;
err = usb_probe_and_attach(child,
USB_IFACE_INDEX_ANY);
if (err) {
goto done;
}
}
/* start control transfer, if device mode */
if (child->flags.usb_mode == USB_MODE_DEVICE)
usbd_ctrl_transfer_setup(child);
/* if a HUB becomes present, do a recursive HUB explore */
if (child->hub)
err = (child->hub->explore) (child);
done:
return (err);
}
/*------------------------------------------------------------------------*
* uhub_read_port_status - factored out code
*------------------------------------------------------------------------*/
static usb_error_t
uhub_read_port_status(struct uhub_softc *sc, uint8_t portno)
{
struct usb_port_status ps;
usb_error_t err;
err = usbd_req_get_port_status(
sc->sc_udev, NULL, &ps, portno);
/* update status regardless of error */
sc->sc_st.port_status = UGETW(ps.wPortStatus);
sc->sc_st.port_change = UGETW(ps.wPortChange);
/* debugging print */
DPRINTFN(4, "port %d, wPortStatus=0x%04x, "
"wPortChange=0x%04x, err=%s\n",
portno, sc->sc_st.port_status,
sc->sc_st.port_change, usbd_errstr(err));
return (err);
}
/*------------------------------------------------------------------------*
* uhub_reattach_port
*
* Returns:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb_error_t
uhub_reattach_port(struct uhub_softc *sc, uint8_t portno)
{
struct usb_device *child;
struct usb_device *udev;
enum usb_dev_speed speed;
enum usb_hc_mode mode;
usb_error_t err;
uint16_t power_mask;
uint8_t timeout;
DPRINTF("reattaching port %d\n", portno);
timeout = 0;
udev = sc->sc_udev;
child = usb_bus_port_get_device(udev->bus,
udev->hub->ports + portno - 1);
repeat:
/* first clear the port connection change bit */
err = usbd_req_clear_port_feature(udev, NULL,
portno, UHF_C_PORT_CONNECTION);
if (err) {
goto error;
}
/* check if there is a child */
if (child != NULL) {
/*
* Free USB device and all subdevices, if any.
*/
usb_free_device(child, 0);
child = NULL;
}
/* get fresh status */
err = uhub_read_port_status(sc, portno);
if (err) {
goto error;
}
/* check if nothing is connected to the port */
if (!(sc->sc_st.port_status & UPS_CURRENT_CONNECT_STATUS)) {
goto error;
}
/* check if there is no power on the port and print a warning */
switch (udev->speed) {
case USB_SPEED_HIGH:
case USB_SPEED_FULL:
case USB_SPEED_LOW:
power_mask = UPS_PORT_POWER;
break;
case USB_SPEED_SUPER:
if (udev->parent_hub == NULL)
power_mask = UPS_PORT_POWER;
else
power_mask = UPS_PORT_POWER_SS;
break;
default:
power_mask = 0;
break;
}
if (!(sc->sc_st.port_status & power_mask)) {
DPRINTF("WARNING: strange, connected port %d "
"has no power\n", portno);
}
/* check if the device is in Host Mode */
if (!(sc->sc_st.port_status & UPS_PORT_MODE_DEVICE)) {
DPRINTF("Port %d is in Host Mode\n", portno);
if (sc->sc_st.port_status & UPS_SUSPEND) {
/*
* NOTE: Should not get here in SuperSpeed
* mode, because the HUB should report this
* bit as zero.
*/
DPRINTF("Port %d was still "
"suspended, clearing.\n", portno);
err = usbd_req_clear_port_feature(udev,
NULL, portno, UHF_PORT_SUSPEND);
}
/* USB Host Mode */
/* wait for maximum device power up time */
usb_pause_mtx(NULL,
USB_MS_TO_TICKS(usb_port_powerup_delay));
/* reset port, which implies enabling it */
err = usbd_req_reset_port(udev, NULL, portno);
if (err) {
DPRINTFN(0, "port %d reset "
"failed, error=%s\n",
portno, usbd_errstr(err));
goto error;
}
/* get port status again, it might have changed during reset */
err = uhub_read_port_status(sc, portno);
if (err) {
goto error;
}
/* check if something changed during port reset */
if ((sc->sc_st.port_change & UPS_C_CONNECT_STATUS) ||
(!(sc->sc_st.port_status & UPS_CURRENT_CONNECT_STATUS))) {
if (timeout) {
DPRINTFN(0, "giving up port reset "
"- device vanished\n");
goto error;
}
timeout = 1;
goto repeat;
}
} else {
DPRINTF("Port %d is in Device Mode\n", portno);
}
/*
* Figure out the device speed
*/
switch (udev->speed) {
case USB_SPEED_HIGH:
if (sc->sc_st.port_status & UPS_HIGH_SPEED)
speed = USB_SPEED_HIGH;
else if (sc->sc_st.port_status & UPS_LOW_SPEED)
speed = USB_SPEED_LOW;
else
speed = USB_SPEED_FULL;
break;
case USB_SPEED_FULL:
if (sc->sc_st.port_status & UPS_LOW_SPEED)
speed = USB_SPEED_LOW;
else
speed = USB_SPEED_FULL;
break;
case USB_SPEED_LOW:
speed = USB_SPEED_LOW;
break;
case USB_SPEED_SUPER:
if (udev->parent_hub == NULL) {
/* Root HUB - special case */
switch (sc->sc_st.port_status & UPS_OTHER_SPEED) {
case 0:
speed = USB_SPEED_FULL;
break;
case UPS_LOW_SPEED:
speed = USB_SPEED_LOW;
break;
case UPS_HIGH_SPEED:
speed = USB_SPEED_HIGH;
break;
default:
speed = USB_SPEED_SUPER;
break;
}
} else {
speed = USB_SPEED_SUPER;
}
break;
default:
/* same speed like parent */
speed = udev->speed;
break;
}
if (speed == USB_SPEED_SUPER) {
err = usbd_req_set_hub_u1_timeout(udev, NULL,
portno, 128 - (2 * udev->depth));
if (err) {
DPRINTFN(0, "port %d U1 timeout "
"failed, error=%s\n",
portno, usbd_errstr(err));
}
err = usbd_req_set_hub_u2_timeout(udev, NULL,
portno, 128 - (2 * udev->depth));
if (err) {
DPRINTFN(0, "port %d U2 timeout "
"failed, error=%s\n",
portno, usbd_errstr(err));
}
}
/*
* Figure out the device mode
*
* NOTE: This part is currently FreeBSD specific.
*/
if (udev->parent_hub != NULL) {
/* inherit mode from the parent HUB */
mode = udev->parent_hub->flags.usb_mode;
} else if (sc->sc_st.port_status & UPS_PORT_MODE_DEVICE)
mode = USB_MODE_DEVICE;
else
mode = USB_MODE_HOST;
/* need to create a new child */
child = usb_alloc_device(sc->sc_dev, udev->bus, udev,
udev->depth + 1, portno - 1, portno, speed, mode);
if (child == NULL) {
DPRINTFN(0, "could not allocate new device\n");
goto error;
}
return (0); /* success */
error:
if (child != NULL) {
/*
* Free USB device and all subdevices, if any.
*/
usb_free_device(child, 0);
child = NULL;
}
if (err == 0) {
if (sc->sc_st.port_status & UPS_PORT_ENABLED) {
err = usbd_req_clear_port_feature(
sc->sc_udev, NULL,
portno, UHF_PORT_ENABLE);
}
}
if (err) {
DPRINTFN(0, "device problem (%s), "
"disabling port %d\n", usbd_errstr(err), portno);
}
return (err);
}
/*------------------------------------------------------------------------*
* usb_device_20_compatible
*
* Returns:
* 0: HUB does not support suspend and resume
* Else: HUB supports suspend and resume
*------------------------------------------------------------------------*/
static uint8_t
usb_device_20_compatible(struct usb_device *udev)
{
if (udev == NULL)
return (0);
switch (udev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
return (1);
default:
return (0);
}
}
/*------------------------------------------------------------------------*
* uhub_suspend_resume_port
*
* Returns:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb_error_t
uhub_suspend_resume_port(struct uhub_softc *sc, uint8_t portno)
{
struct usb_device *child;
struct usb_device *udev;
uint8_t is_suspend;
usb_error_t err;
DPRINTF("port %d\n", portno);
udev = sc->sc_udev;
child = usb_bus_port_get_device(udev->bus,
udev->hub->ports + portno - 1);
/* first clear the port suspend change bit */
if (usb_device_20_compatible(udev)) {
err = usbd_req_clear_port_feature(udev, NULL,
portno, UHF_C_PORT_SUSPEND);
} else {
err = usbd_req_clear_port_feature(udev, NULL,
portno, UHF_C_PORT_LINK_STATE);
}
if (err) {
DPRINTF("clearing suspend failed.\n");
goto done;
}
/* get fresh status */
err = uhub_read_port_status(sc, portno);
if (err) {
DPRINTF("reading port status failed.\n");
goto done;
}
/* convert current state */
if (usb_device_20_compatible(udev)) {
if (sc->sc_st.port_status & UPS_SUSPEND) {
is_suspend = 1;
} else {
is_suspend = 0;
}
} else {
switch (UPS_PORT_LINK_STATE_GET(sc->sc_st.port_status)) {
case UPS_PORT_LS_U3:
is_suspend = 1;
break;
case UPS_PORT_LS_SS_INA:
usbd_req_warm_reset_port(udev, NULL, portno);
is_suspend = 0;
break;
default:
is_suspend = 0;
break;
}
}
DPRINTF("suspended=%u\n", is_suspend);
/* do the suspend or resume */
if (child) {
/*
* This code handle two cases: 1) Host Mode - we can only
* receive resume here 2) Device Mode - we can receive
* suspend and resume here
*/
if (is_suspend == 0)
usb_dev_resume_peer(child);
else if (child->flags.usb_mode == USB_MODE_DEVICE)
usb_dev_suspend_peer(child);
}
done:
return (err);
}
/*------------------------------------------------------------------------*
* uhub_root_interrupt
*
* This function is called when a Root HUB interrupt has
* happened. "ptr" and "len" makes up the Root HUB interrupt
* packet. This function is called having the "bus_mtx" locked.
*------------------------------------------------------------------------*/
void
uhub_root_intr(struct usb_bus *bus, const uint8_t *ptr, uint8_t len)
{
USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
usb_needs_explore(bus, 0);
}
static uint8_t
uhub_is_too_deep(struct usb_device *udev)
{
switch (udev->speed) {
case USB_SPEED_FULL:
case USB_SPEED_LOW:
case USB_SPEED_HIGH:
if (udev->depth > USB_HUB_MAX_DEPTH)
return (1);
break;
case USB_SPEED_SUPER:
if (udev->depth > USB_SS_HUB_DEPTH_MAX)
return (1);
break;
default:
break;
}
return (0);
}
/*------------------------------------------------------------------------*
* uhub_explore
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
static usb_error_t
uhub_explore(struct usb_device *udev)
{
struct usb_hub *hub;
struct uhub_softc *sc;
struct usb_port *up;
usb_error_t err;
uint8_t portno;
uint8_t x;
uint8_t do_unlock;
hub = udev->hub;
sc = hub->hubsoftc;
DPRINTFN(11, "udev=%p addr=%d\n", udev, udev->address);
/* ignore devices that are too deep */
if (uhub_is_too_deep(udev))
return (USB_ERR_TOO_DEEP);
/* check if device is suspended */
if (udev->flags.self_suspended) {
/* need to wait until the child signals resume */
DPRINTF("Device is suspended!\n");
return (0);
}
/*
* Make sure we don't race against user-space applications
* like LibUSB:
*/
do_unlock = usbd_enum_lock(udev);
for (x = 0; x != hub->nports; x++) {
up = hub->ports + x;
portno = x + 1;
err = uhub_read_port_status(sc, portno);
if (err) {
/* most likely the HUB is gone */
break;
}
if (sc->sc_st.port_change & UPS_C_OVERCURRENT_INDICATOR) {
DPRINTF("Overcurrent on port %u.\n", portno);
err = usbd_req_clear_port_feature(
udev, NULL, portno, UHF_C_PORT_OVER_CURRENT);
if (err) {
/* most likely the HUB is gone */
break;
}
}
if (!(sc->sc_flags & UHUB_FLAG_DID_EXPLORE)) {
/*
* Fake a connect status change so that the
* status gets checked initially!
*/
sc->sc_st.port_change |=
UPS_C_CONNECT_STATUS;
}
if (sc->sc_st.port_change & UPS_C_PORT_ENABLED) {
err = usbd_req_clear_port_feature(
udev, NULL, portno, UHF_C_PORT_ENABLE);
if (err) {
/* most likely the HUB is gone */
break;
}
if (sc->sc_st.port_change & UPS_C_CONNECT_STATUS) {
/*
* Ignore the port error if the device
* has vanished !
*/
} else if (sc->sc_st.port_status & UPS_PORT_ENABLED) {
DPRINTFN(0, "illegal enable change, "
"port %d\n", portno);
} else {
if (up->restartcnt == USB_RESTART_MAX) {
/* XXX could try another speed ? */
DPRINTFN(0, "port error, giving up "
"port %d\n", portno);
} else {
sc->sc_st.port_change |=
UPS_C_CONNECT_STATUS;
up->restartcnt++;
}
}
}
if (sc->sc_st.port_change & UPS_C_CONNECT_STATUS) {
err = uhub_reattach_port(sc, portno);
if (err) {
/* most likely the HUB is gone */
break;
}
}
if (sc->sc_st.port_change & (UPS_C_SUSPEND |
UPS_C_PORT_LINK_STATE)) {
err = uhub_suspend_resume_port(sc, portno);
if (err) {
/* most likely the HUB is gone */
break;
}
}
err = uhub_explore_sub(sc, up);
if (err) {
/* no device(s) present */
continue;
}
/* explore succeeded - reset restart counter */
up->restartcnt = 0;
}
if (do_unlock)
usbd_enum_unlock(udev);
/* initial status checked */
sc->sc_flags |= UHUB_FLAG_DID_EXPLORE;
/* return success */
return (USB_ERR_NORMAL_COMPLETION);
}
static int
uhub_probe(device_t dev)
{
struct usb_attach_arg *uaa = device_get_ivars(dev);
if (uaa->usb_mode != USB_MODE_HOST)
return (ENXIO);
/*
* The subclass for USB HUBs is currently ignored because it
* is 0 for some and 1 for others.
*/
if (uaa->info.bConfigIndex == 0 &&
uaa->info.bDeviceClass == UDCLASS_HUB)
return (0);
return (ENXIO);
}
/* NOTE: The information returned by this function can be wrong. */
usb_error_t
uhub_query_info(struct usb_device *udev, uint8_t *pnports, uint8_t *ptt)
{
struct usb_hub_descriptor hubdesc20;
struct usb_hub_ss_descriptor hubdesc30;
usb_error_t err;
uint8_t nports;
uint8_t tt;
if (udev->ddesc.bDeviceClass != UDCLASS_HUB)
return (USB_ERR_INVAL);
nports = 0;
tt = 0;
switch (udev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
/* assuming that there is one port */
err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc20, 1);
if (err) {
DPRINTFN(0, "getting USB 2.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
break;
}
nports = hubdesc20.bNbrPorts;
if (nports > 127)
nports = 127;
if (udev->speed == USB_SPEED_HIGH)
tt = (UGETW(hubdesc20.wHubCharacteristics) >> 5) & 3;
break;
case USB_SPEED_SUPER:
err = usbd_req_get_ss_hub_descriptor(udev, NULL, &hubdesc30, 1);
if (err) {
DPRINTFN(0, "Getting USB 3.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
break;
}
nports = hubdesc30.bNbrPorts;
if (nports > 16)
nports = 16;
break;
default:
err = USB_ERR_INVAL;
break;
}
if (pnports != NULL)
*pnports = nports;
if (ptt != NULL)
*ptt = tt;
return (err);
}
static int
uhub_attach(device_t dev)
{
struct uhub_softc *sc = device_get_softc(dev);
struct usb_attach_arg *uaa = device_get_ivars(dev);
struct usb_device *udev = uaa->device;
struct usb_device *parent_hub = udev->parent_hub;
struct usb_hub *hub;
struct usb_hub_descriptor hubdesc20;
struct usb_hub_ss_descriptor hubdesc30;
uint16_t pwrdly;
uint16_t nports;
uint8_t x;
uint8_t portno;
uint8_t removable;
uint8_t iface_index;
usb_error_t err;
sc->sc_udev = udev;
sc->sc_dev = dev;
mtx_init(&sc->sc_mtx, "USB HUB mutex", NULL, MTX_DEF);
device_set_usb_desc(dev);
DPRINTFN(2, "depth=%d selfpowered=%d, parent=%p, "
"parent->selfpowered=%d\n",
udev->depth,
udev->flags.self_powered,
parent_hub,
parent_hub ?
parent_hub->flags.self_powered : 0);
if (uhub_is_too_deep(udev)) {
DPRINTFN(0, "HUB at depth %d, "
"exceeds maximum. HUB ignored\n", (int)udev->depth);
goto error;
}
if (!udev->flags.self_powered && parent_hub &&
!parent_hub->flags.self_powered) {
DPRINTFN(0, "Bus powered HUB connected to "
"bus powered HUB. HUB ignored\n");
goto error;
}
if (UHUB_IS_MULTI_TT(sc)) {
err = usbd_set_alt_interface_index(udev, 0, 1);
if (err) {
device_printf(dev, "MTT could not be enabled\n");
goto error;
}
device_printf(dev, "MTT enabled\n");
}
/* get HUB descriptor */
DPRINTFN(2, "Getting HUB descriptor\n");
switch (udev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
/* assuming that there is one port */
err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc20, 1);
if (err) {
DPRINTFN(0, "getting USB 2.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
goto error;
}
/* get number of ports */
nports = hubdesc20.bNbrPorts;
/* get power delay */
pwrdly = ((hubdesc20.bPwrOn2PwrGood * UHD_PWRON_FACTOR) +
usb_extra_power_up_time);
/* get complete HUB descriptor */
if (nports >= 8) {
/* check number of ports */
if (nports > 127) {
DPRINTFN(0, "Invalid number of USB 2.0 ports,"
"error=%s\n", usbd_errstr(err));
goto error;
}
/* get complete HUB descriptor */
err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc20, nports);
if (err) {
DPRINTFN(0, "Getting USB 2.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
goto error;
}
if (hubdesc20.bNbrPorts != nports) {
DPRINTFN(0, "Number of ports changed\n");
goto error;
}
}
break;
case USB_SPEED_SUPER:
if (udev->parent_hub != NULL) {
err = usbd_req_set_hub_depth(udev, NULL,
udev->depth - 1);
if (err) {
DPRINTFN(0, "Setting USB 3.0 HUB depth failed,"
"error=%s\n", usbd_errstr(err));
goto error;
}
}
err = usbd_req_get_ss_hub_descriptor(udev, NULL, &hubdesc30, 1);
if (err) {
DPRINTFN(0, "Getting USB 3.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
goto error;
}
/* get number of ports */
nports = hubdesc30.bNbrPorts;
/* get power delay */
pwrdly = ((hubdesc30.bPwrOn2PwrGood * UHD_PWRON_FACTOR) +
usb_extra_power_up_time);
/* get complete HUB descriptor */
if (nports >= 8) {
/* check number of ports */
if (nports > ((udev->parent_hub != NULL) ? 15 : 127)) {
DPRINTFN(0, "Invalid number of USB 3.0 ports,"
"error=%s\n", usbd_errstr(err));
goto error;
}
/* get complete HUB descriptor */
err = usbd_req_get_ss_hub_descriptor(udev, NULL, &hubdesc30, nports);
if (err) {
DPRINTFN(0, "Getting USB 2.0 HUB descriptor failed,"
"error=%s\n", usbd_errstr(err));
goto error;
}
if (hubdesc30.bNbrPorts != nports) {
DPRINTFN(0, "Number of ports changed\n");
goto error;
}
}
break;
default:
DPRINTF("Assuming HUB has only one port\n");
/* default number of ports */
nports = 1;
/* default power delay */
pwrdly = ((10 * UHD_PWRON_FACTOR) + usb_extra_power_up_time);
break;
}
if (nports == 0) {
DPRINTFN(0, "portless HUB\n");
goto error;
}
if (nports > USB_MAX_PORTS) {
DPRINTF("Port limit exceeded\n");
goto error;
}
#if (USB_HAVE_FIXED_PORT == 0)
hub = malloc(sizeof(hub[0]) + (sizeof(hub->ports[0]) * nports),
M_USBDEV, M_WAITOK | M_ZERO);
if (hub == NULL)
goto error;
#else
hub = &sc->sc_hub;
#endif
udev->hub = hub;
/* initialize HUB structure */
hub->hubsoftc = sc;
hub->explore = &uhub_explore;
hub->nports = nports;
hub->hubudev = udev;
#if USB_HAVE_TT_SUPPORT
hub->tt_msg[0].hdr.pm_callback = &uhub_reset_tt_proc;
hub->tt_msg[0].udev = udev;
hub->tt_msg[1].hdr.pm_callback = &uhub_reset_tt_proc;
hub->tt_msg[1].udev = udev;
#endif
/* if self powered hub, give ports maximum current */
if (udev->flags.self_powered) {
hub->portpower = USB_MAX_POWER;
} else {
hub->portpower = USB_MIN_POWER;
}
/* set up interrupt pipe */
iface_index = 0;
if (udev->parent_hub == NULL) {
/* root HUB is special */
err = 0;
} else {
/* normal HUB */
err = usbd_transfer_setup(udev, &iface_index, sc->sc_xfer,
uhub_config, UHUB_N_TRANSFER, sc, &sc->sc_mtx);
}
if (err) {
DPRINTFN(0, "cannot setup interrupt transfer, "
"errstr=%s\n", usbd_errstr(err));
goto error;
}
/* wait with power off for a while */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(USB_POWER_DOWN_TIME));
/*
* To have the best chance of success we do things in the exact same
* order as Windoze98. This should not be necessary, but some
* devices do not follow the USB specs to the letter.
*
* These are the events on the bus when a hub is attached:
* Get device and config descriptors (see attach code)
* Get hub descriptor (see above)
* For all ports
* turn on power
* wait for power to become stable
* (all below happens in explore code)
* For all ports
* clear C_PORT_CONNECTION
* For all ports
* get port status
* if device connected
* wait 100 ms
* turn on reset
* wait
* clear C_PORT_RESET
* get port status
* proceed with device attachment
*/
/* XXX should check for none, individual, or ganged power? */
removable = 0;
for (x = 0; x != nports; x++) {
/* set up data structures */
struct usb_port *up = hub->ports + x;
up->device_index = 0;
up->restartcnt = 0;
portno = x + 1;
/* check if port is removable */
switch (udev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
if (!UHD_NOT_REMOV(&hubdesc20, portno))
removable++;
break;
case USB_SPEED_SUPER:
if (!UHD_NOT_REMOV(&hubdesc30, portno))
removable++;
break;
default:
DPRINTF("Assuming removable port\n");
removable++;
break;
}
if (!err) {
/* turn the power on */
err = usbd_req_set_port_feature(udev, NULL,
portno, UHF_PORT_POWER);
}
if (err) {
DPRINTFN(0, "port %d power on failed, %s\n",
portno, usbd_errstr(err));
}
DPRINTF("turn on port %d power\n",
portno);
/* wait for stable power */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(pwrdly));
}
device_printf(dev, "%d port%s with %d "
"removable, %s powered\n", nports, (nports != 1) ? "s" : "",
removable, udev->flags.self_powered ? "self" : "bus");
/* Start the interrupt endpoint, if any */
mtx_lock(&sc->sc_mtx);
usbd_transfer_start(sc->sc_xfer[UHUB_INTR_TRANSFER]);
mtx_unlock(&sc->sc_mtx);
/* Enable automatic power save on all USB HUBs */
usbd_set_power_mode(udev, USB_POWER_MODE_SAVE);
return (0);
error:
usbd_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER);
#if (USB_HAVE_FIXED_PORT == 0)
free(udev->hub, M_USBDEV);
#endif
udev->hub = NULL;
mtx_destroy(&sc->sc_mtx);
return (ENXIO);
}
/*
* Called from process context when the hub is gone.
* Detach all devices on active ports.
*/
static int
uhub_detach(device_t dev)
{
struct uhub_softc *sc = device_get_softc(dev);
struct usb_hub *hub = sc->sc_udev->hub;
struct usb_bus *bus = sc->sc_udev->bus;
struct usb_device *child;
uint8_t x;
if (hub == NULL) /* must be partially working */
return (0);
/* Make sure interrupt transfer is gone. */
usbd_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER);
/* Detach all ports */
for (x = 0; x != hub->nports; x++) {
child = usb_bus_port_get_device(bus, hub->ports + x);
if (child == NULL) {
continue;
}
/*
* Free USB device and all subdevices, if any.
*/
usb_free_device(child, 0);
}
#if USB_HAVE_TT_SUPPORT
/* Make sure our TT messages are not queued anywhere */
USB_BUS_LOCK(bus);
usb_proc_mwait(USB_BUS_NON_GIANT_PROC(bus),
&hub->tt_msg[0], &hub->tt_msg[1]);
USB_BUS_UNLOCK(bus);
#endif
#if (USB_HAVE_FIXED_PORT == 0)
free(hub, M_USBDEV);
#endif
sc->sc_udev->hub = NULL;
mtx_destroy(&sc->sc_mtx);
return (0);
}
static int
uhub_suspend(device_t dev)
{
DPRINTF("\n");
/* Sub-devices are not suspended here! */
return (0);
}
static int
uhub_resume(device_t dev)
{
DPRINTF("\n");
/* Sub-devices are not resumed here! */
return (0);
}
static void
uhub_driver_added(device_t dev, driver_t *driver)
{
usb_needs_explore_all();
}
struct hub_result {
struct usb_device *udev;
uint8_t portno;
uint8_t iface_index;
};
static void
uhub_find_iface_index(struct usb_hub *hub, device_t child,
struct hub_result *res)
{
struct usb_interface *iface;
struct usb_device *udev;
uint8_t nports;
uint8_t x;
uint8_t i;
nports = hub->nports;
for (x = 0; x != nports; x++) {
udev = usb_bus_port_get_device(hub->hubudev->bus,
hub->ports + x);
if (!udev) {
continue;
}
for (i = 0; i != USB_IFACE_MAX; i++) {
iface = usbd_get_iface(udev, i);
if (iface &&
(iface->subdev == child)) {
res->iface_index = i;
res->udev = udev;
res->portno = x + 1;
return;
}
}
}
res->iface_index = 0;
res->udev = NULL;
res->portno = 0;
}
static int
uhub_child_location_string(device_t parent, device_t child,
char *buf, size_t buflen)
{
struct uhub_softc *sc;
struct usb_hub *hub;
struct hub_result res;
if (!device_is_attached(parent)) {
if (buflen)
buf[0] = 0;
return (0);
}
sc = device_get_softc(parent);
hub = sc->sc_udev->hub;
mtx_lock(&Giant);
uhub_find_iface_index(hub, child, &res);
if (!res.udev) {
DPRINTF("device not on hub\n");
if (buflen) {
buf[0] = '\0';
}
goto done;
}
snprintf(buf, buflen, "bus=%u hubaddr=%u port=%u devaddr=%u interface=%u",
device_get_unit(res.udev->bus->bdev),
(res.udev->parent_hub != NULL) ? res.udev->parent_hub->device_index : 0,
res.portno,
res.udev->device_index, res.iface_index);
done:
mtx_unlock(&Giant);
return (0);
}
static int
uhub_child_pnpinfo_string(device_t parent, device_t child,
char *buf, size_t buflen)
{
struct uhub_softc *sc;
struct usb_hub *hub;
struct usb_interface *iface;
struct hub_result res;
if (!device_is_attached(parent)) {
if (buflen)
buf[0] = 0;
return (0);
}
sc = device_get_softc(parent);
hub = sc->sc_udev->hub;
mtx_lock(&Giant);
uhub_find_iface_index(hub, child, &res);
if (!res.udev) {
DPRINTF("device not on hub\n");
if (buflen) {
buf[0] = '\0';
}
goto done;
}
iface = usbd_get_iface(res.udev, res.iface_index);
if (iface && iface->idesc) {
snprintf(buf, buflen, "vendor=0x%04x product=0x%04x "
"devclass=0x%02x devsubclass=0x%02x "
"sernum=\"%s\" "
"release=0x%04x "
"mode=%s "
"intclass=0x%02x intsubclass=0x%02x "
"intprotocol=0x%02x " "%s%s",
UGETW(res.udev->ddesc.idVendor),
UGETW(res.udev->ddesc.idProduct),
res.udev->ddesc.bDeviceClass,
res.udev->ddesc.bDeviceSubClass,
usb_get_serial(res.udev),
UGETW(res.udev->ddesc.bcdDevice),
(res.udev->flags.usb_mode == USB_MODE_HOST) ? "host" : "device",
iface->idesc->bInterfaceClass,
iface->idesc->bInterfaceSubClass,
iface->idesc->bInterfaceProtocol,
iface->pnpinfo ? " " : "",
iface->pnpinfo ? iface->pnpinfo : "");
} else {
if (buflen) {
buf[0] = '\0';
}
goto done;
}
done:
mtx_unlock(&Giant);
return (0);
}
/*
* The USB Transaction Translator:
* ===============================
*
* When doing LOW- and FULL-speed USB transfers accross a HIGH-speed
* USB HUB, bandwidth must be allocated for ISOCHRONOUS and INTERRUPT
* USB transfers. To utilize bandwidth dynamically the "scatter and
* gather" principle must be applied. This means that bandwidth must
* be divided into equal parts of bandwidth. With regard to USB all
* data is transferred in smaller packets with length
* "wMaxPacketSize". The problem however is that "wMaxPacketSize" is
* not a constant!
*
* The bandwidth scheduler which I have implemented will simply pack
* the USB transfers back to back until there is no more space in the
* schedule. Out of the 8 microframes which the USB 2.0 standard
* provides, only 6 are available for non-HIGH-speed devices. I have
* reserved the first 4 microframes for ISOCHRONOUS transfers. The
* last 2 microframes I have reserved for INTERRUPT transfers. Without
* this division, it is very difficult to allocate and free bandwidth
* dynamically.
*
* NOTE about the Transaction Translator in USB HUBs:
*
* USB HUBs have a very simple Transaction Translator, that will
* simply pipeline all the SPLIT transactions. That means that the
* transactions will be executed in the order they are queued!
*
*/
/*------------------------------------------------------------------------*
* usb_intr_find_best_slot
*
* Return value:
* The best Transaction Translation slot for an interrupt endpoint.
*------------------------------------------------------------------------*/
static uint8_t
usb_intr_find_best_slot(usb_size_t *ptr, uint8_t start,
uint8_t end, uint8_t mask)
{
usb_size_t min = (usb_size_t)-1;
usb_size_t sum;
uint8_t x;
uint8_t y;
uint8_t z;
y = 0;
/* find the last slot with lesser used bandwidth */
for (x = start; x < end; x++) {
sum = 0;
/* compute sum of bandwidth */
for (z = x; z < end; z++) {
if (mask & (1U << (z - x)))
sum += ptr[z];
}
/* check if the current multi-slot is more optimal */
if (min >= sum) {
min = sum;
y = x;
}
/* check if the mask is about to be shifted out */
if (mask & (1U << (end - 1 - x)))
break;
}
return (y);
}
/*------------------------------------------------------------------------*
* usb_hs_bandwidth_adjust
*
* This function will update the bandwith usage for the microframe
* having index "slot" by "len" bytes. "len" can be negative. If the
* "slot" argument is greater or equal to "USB_HS_MICRO_FRAMES_MAX"
* the "slot" argument will be replaced by the slot having least used
* bandwidth. The "mask" argument is used for multi-slot allocations.
*
* Returns:
* The slot in which the bandwidth update was done: 0..7
*------------------------------------------------------------------------*/
static uint8_t
usb_hs_bandwidth_adjust(struct usb_device *udev, int16_t len,
uint8_t slot, uint8_t mask)
{
struct usb_bus *bus = udev->bus;
struct usb_hub *hub;
enum usb_dev_speed speed;
uint8_t x;
USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
speed = usbd_get_speed(udev);
switch (speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
if (speed == USB_SPEED_LOW) {
len *= 8;
}
/*
* The Host Controller Driver should have
* performed checks so that the lookup
* below does not result in a NULL pointer
* access.
*/
hub = udev->parent_hs_hub->hub;
if (slot >= USB_HS_MICRO_FRAMES_MAX) {
slot = usb_intr_find_best_slot(hub->uframe_usage,
USB_FS_ISOC_UFRAME_MAX, 6, mask);
}
for (x = slot; x < 8; x++) {
if (mask & (1U << (x - slot))) {
hub->uframe_usage[x] += len;
bus->uframe_usage[x] += len;
}
}
break;
default:
if (slot >= USB_HS_MICRO_FRAMES_MAX) {
slot = usb_intr_find_best_slot(bus->uframe_usage, 0,
USB_HS_MICRO_FRAMES_MAX, mask);
}
for (x = slot; x < 8; x++) {
if (mask & (1U << (x - slot))) {
bus->uframe_usage[x] += len;
}
}
break;
}
return (slot);
}
/*------------------------------------------------------------------------*
* usb_hs_bandwidth_alloc
*
* This function is a wrapper function for "usb_hs_bandwidth_adjust()".
*------------------------------------------------------------------------*/
void
usb_hs_bandwidth_alloc(struct usb_xfer *xfer)
{
struct usb_device *udev;
uint8_t slot;
uint8_t mask;
uint8_t speed;
udev = xfer->xroot->udev;
if (udev->flags.usb_mode != USB_MODE_HOST)
return; /* not supported */
xfer->endpoint->refcount_bw++;
if (xfer->endpoint->refcount_bw != 1)
return; /* already allocated */
speed = usbd_get_speed(udev);
switch (xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE) {
case UE_INTERRUPT:
/* allocate a microframe slot */
mask = 0x01;
slot = usb_hs_bandwidth_adjust(udev,
xfer->max_frame_size, USB_HS_MICRO_FRAMES_MAX, mask);
xfer->endpoint->usb_uframe = slot;
xfer->endpoint->usb_smask = mask << slot;
if ((speed != USB_SPEED_FULL) &&
(speed != USB_SPEED_LOW)) {
xfer->endpoint->usb_cmask = 0x00 ;
} else {
xfer->endpoint->usb_cmask = (-(0x04 << slot)) & 0xFE;
}
break;
case UE_ISOCHRONOUS:
switch (usbd_xfer_get_fps_shift(xfer)) {
case 0:
mask = 0xFF;
break;
case 1:
mask = 0x55;
break;
case 2:
mask = 0x11;
break;
default:
mask = 0x01;
break;
}
/* allocate a microframe multi-slot */
slot = usb_hs_bandwidth_adjust(udev,
xfer->max_frame_size, USB_HS_MICRO_FRAMES_MAX, mask);
xfer->endpoint->usb_uframe = slot;
xfer->endpoint->usb_cmask = 0;
xfer->endpoint->usb_smask = mask << slot;
break;
default:
xfer->endpoint->usb_uframe = 0;
xfer->endpoint->usb_cmask = 0;
xfer->endpoint->usb_smask = 0;
break;
}
DPRINTFN(11, "slot=%d, mask=0x%02x\n",
xfer->endpoint->usb_uframe,
xfer->endpoint->usb_smask >> xfer->endpoint->usb_uframe);
}
/*------------------------------------------------------------------------*
* usb_hs_bandwidth_free
*
* This function is a wrapper function for "usb_hs_bandwidth_adjust()".
*------------------------------------------------------------------------*/
void
usb_hs_bandwidth_free(struct usb_xfer *xfer)
{
struct usb_device *udev;
uint8_t slot;
uint8_t mask;
udev = xfer->xroot->udev;
if (udev->flags.usb_mode != USB_MODE_HOST)
return; /* not supported */
xfer->endpoint->refcount_bw--;
if (xfer->endpoint->refcount_bw != 0)
return; /* still allocated */
switch (xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE) {
case UE_INTERRUPT:
case UE_ISOCHRONOUS:
slot = xfer->endpoint->usb_uframe;
mask = xfer->endpoint->usb_smask;
/* free microframe slot(s): */
usb_hs_bandwidth_adjust(udev,
-xfer->max_frame_size, slot, mask >> slot);
DPRINTFN(11, "slot=%d, mask=0x%02x\n",
slot, mask >> slot);
xfer->endpoint->usb_uframe = 0;
xfer->endpoint->usb_cmask = 0;
xfer->endpoint->usb_smask = 0;
break;
default:
break;
}
}
/*------------------------------------------------------------------------*
* usb_isoc_time_expand
*
* This function will expand the time counter from 7-bit to 16-bit.
*
* Returns:
* 16-bit isochronous time counter.
*------------------------------------------------------------------------*/
uint16_t
usb_isoc_time_expand(struct usb_bus *bus, uint16_t isoc_time_curr)
{
uint16_t rem;
USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
rem = bus->isoc_time_last & (USB_ISOC_TIME_MAX - 1);
isoc_time_curr &= (USB_ISOC_TIME_MAX - 1);
if (isoc_time_curr < rem) {
/* the time counter wrapped around */
bus->isoc_time_last += USB_ISOC_TIME_MAX;
}
/* update the remainder */
bus->isoc_time_last &= ~(USB_ISOC_TIME_MAX - 1);
bus->isoc_time_last |= isoc_time_curr;
return (bus->isoc_time_last);
}
/*------------------------------------------------------------------------*
* usbd_fs_isoc_schedule_alloc_slot
*
* This function will allocate bandwidth for an isochronous FULL speed
* transaction in the FULL speed schedule.
*
* Returns:
* <8: Success
* Else: Error
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
uint8_t
usbd_fs_isoc_schedule_alloc_slot(struct usb_xfer *isoc_xfer, uint16_t isoc_time)
{
struct usb_xfer *xfer;
struct usb_xfer *pipe_xfer;
struct usb_bus *bus;
usb_frlength_t len;
usb_frlength_t data_len;
uint16_t delta;
uint16_t slot;
uint8_t retval;
data_len = 0;
slot = 0;
bus = isoc_xfer->xroot->bus;
TAILQ_FOREACH(xfer, &bus->intr_q.head, wait_entry) {
/* skip self, if any */
if (xfer == isoc_xfer)
continue;
/* check if this USB transfer is going through the same TT */
if (xfer->xroot->udev->parent_hs_hub !=
isoc_xfer->xroot->udev->parent_hs_hub) {
continue;
}
if ((isoc_xfer->xroot->udev->parent_hs_hub->
ddesc.bDeviceProtocol == UDPROTO_HSHUBMTT) &&
(xfer->xroot->udev->hs_port_no !=
isoc_xfer->xroot->udev->hs_port_no)) {
continue;
}
if (xfer->endpoint->methods != isoc_xfer->endpoint->methods)
continue;
/* check if isoc_time is part of this transfer */
delta = xfer->isoc_time_complete - isoc_time;
if (delta > 0 && delta <= xfer->nframes) {
delta = xfer->nframes - delta;
len = xfer->frlengths[delta];
len += 8;
len *= 7;
len /= 6;
data_len += len;
}
/*
* Check double buffered transfers. Only stream ID
* equal to zero is valid here!
*/
TAILQ_FOREACH(pipe_xfer, &xfer->endpoint->endpoint_q[0].head,
wait_entry) {
/* skip self, if any */
if (pipe_xfer == isoc_xfer)
continue;
/* check if isoc_time is part of this transfer */
delta = pipe_xfer->isoc_time_complete - isoc_time;
if (delta > 0 && delta <= pipe_xfer->nframes) {
delta = pipe_xfer->nframes - delta;
len = pipe_xfer->frlengths[delta];
len += 8;
len *= 7;
len /= 6;
data_len += len;
}
}
}
while (data_len >= USB_FS_BYTES_PER_HS_UFRAME) {
data_len -= USB_FS_BYTES_PER_HS_UFRAME;
slot++;
}
/* check for overflow */
if (slot >= USB_FS_ISOC_UFRAME_MAX)
return (255);
retval = slot;
delta = isoc_xfer->isoc_time_complete - isoc_time;
if (delta > 0 && delta <= isoc_xfer->nframes) {
delta = isoc_xfer->nframes - delta;
len = isoc_xfer->frlengths[delta];
len += 8;
len *= 7;
len /= 6;
data_len += len;
}
while (data_len >= USB_FS_BYTES_PER_HS_UFRAME) {
data_len -= USB_FS_BYTES_PER_HS_UFRAME;
slot++;
}
/* check for overflow */
if (slot >= USB_FS_ISOC_UFRAME_MAX)
return (255);
return (retval);
}
#endif
/*------------------------------------------------------------------------*
* usb_bus_port_get_device
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
struct usb_device *
usb_bus_port_get_device(struct usb_bus *bus, struct usb_port *up)
{
if ((bus == NULL) || (up == NULL)) {
/* be NULL safe */
return (NULL);
}
if (up->device_index == 0) {
/* nothing to do */
return (NULL);
}
return (bus->devices[up->device_index]);
}
/*------------------------------------------------------------------------*
* usb_bus_port_set_device
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
void
usb_bus_port_set_device(struct usb_bus *bus, struct usb_port *up,
struct usb_device *udev, uint8_t device_index)
{
if (bus == NULL) {
/* be NULL safe */
return;
}
/*
* There is only one case where we don't
* have an USB port, and that is the Root Hub!
*/
if (up) {
if (udev) {
up->device_index = device_index;
} else {
device_index = up->device_index;
up->device_index = 0;
}
}
/*
* Make relationships to our new device
*/
if (device_index != 0) {
#if USB_HAVE_UGEN
mtx_lock(&usb_ref_lock);
#endif
bus->devices[device_index] = udev;
#if USB_HAVE_UGEN
mtx_unlock(&usb_ref_lock);
#endif
}
/*
* Debug print
*/
DPRINTFN(2, "bus %p devices[%u] = %p\n", bus, device_index, udev);
}
/*------------------------------------------------------------------------*
* usb_needs_explore
*
* This functions is called when the USB event thread needs to run.
*------------------------------------------------------------------------*/
void
usb_needs_explore(struct usb_bus *bus, uint8_t do_probe)
{
uint8_t do_unlock;
DPRINTF("\n");
if (bus == NULL) {
DPRINTF("No bus pointer!\n");
return;
}
if ((bus->devices == NULL) ||
(bus->devices[USB_ROOT_HUB_ADDR] == NULL)) {
DPRINTF("No root HUB\n");
return;
}
if (mtx_owned(&bus->bus_mtx)) {
do_unlock = 0;
} else {
USB_BUS_LOCK(bus);
do_unlock = 1;
}
if (do_probe) {
bus->do_probe = 1;
}
if (usb_proc_msignal(USB_BUS_EXPLORE_PROC(bus),
&bus->explore_msg[0], &bus->explore_msg[1])) {
/* ignore */
}
if (do_unlock) {
USB_BUS_UNLOCK(bus);
}
}
/*------------------------------------------------------------------------*
* usb_needs_explore_all
*
* This function is called whenever a new driver is loaded and will
* cause that all USB busses are re-explored.
*------------------------------------------------------------------------*/
void
usb_needs_explore_all(void)
{
struct usb_bus *bus;
devclass_t dc;
device_t dev;
int max;
DPRINTFN(3, "\n");
dc = usb_devclass_ptr;
if (dc == NULL) {
DPRINTFN(0, "no devclass\n");
return;
}
/*
* Explore all USB busses in parallell.
*/
max = devclass_get_maxunit(dc);
while (max >= 0) {
dev = devclass_get_device(dc, max);
if (dev) {
bus = device_get_softc(dev);
if (bus) {
usb_needs_explore(bus, 1);
}
}
max--;
}
}
/*------------------------------------------------------------------------*
* usb_bus_power_update
*
* This function will ensure that all USB devices on the given bus are
* properly suspended or resumed according to the device transfer
* state.
*------------------------------------------------------------------------*/
#if USB_HAVE_POWERD
void
usb_bus_power_update(struct usb_bus *bus)
{
usb_needs_explore(bus, 0 /* no probe */ );
}
#endif
/*------------------------------------------------------------------------*
* usbd_transfer_power_ref
*
* This function will modify the power save reference counts and
* wakeup the USB device associated with the given USB transfer, if
* needed.
*------------------------------------------------------------------------*/
#if USB_HAVE_POWERD
void
usbd_transfer_power_ref(struct usb_xfer *xfer, int val)
{
static const usb_power_mask_t power_mask[4] = {
[UE_CONTROL] = USB_HW_POWER_CONTROL,
[UE_BULK] = USB_HW_POWER_BULK,
[UE_INTERRUPT] = USB_HW_POWER_INTERRUPT,
[UE_ISOCHRONOUS] = USB_HW_POWER_ISOC,
};
struct usb_device *udev;
uint8_t needs_explore;
uint8_t needs_hw_power;
uint8_t xfer_type;
udev = xfer->xroot->udev;
if (udev->device_index == USB_ROOT_HUB_ADDR) {
/* no power save for root HUB */
return;
}
USB_BUS_LOCK(udev->bus);
xfer_type = xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE;
udev->pwr_save.last_xfer_time = ticks;
udev->pwr_save.type_refs[xfer_type] += val;
if (xfer->flags_int.control_xfr) {
udev->pwr_save.read_refs += val;
if (xfer->flags_int.usb_mode == USB_MODE_HOST) {
/*
* It is not allowed to suspend during a
* control transfer:
*/
udev->pwr_save.write_refs += val;
}
} else if (USB_GET_DATA_ISREAD(xfer)) {
udev->pwr_save.read_refs += val;
} else {
udev->pwr_save.write_refs += val;
}
if (val > 0) {
if (udev->flags.self_suspended)
needs_explore = usb_peer_should_wakeup(udev);
else
needs_explore = 0;
if (!(udev->bus->hw_power_state & power_mask[xfer_type])) {
DPRINTF("Adding type %u to power state\n", xfer_type);
udev->bus->hw_power_state |= power_mask[xfer_type];
needs_hw_power = 1;
} else {
needs_hw_power = 0;
}
} else {
needs_explore = 0;
needs_hw_power = 0;
}
USB_BUS_UNLOCK(udev->bus);
if (needs_explore) {
DPRINTF("update\n");
usb_bus_power_update(udev->bus);
} else if (needs_hw_power) {
DPRINTF("needs power\n");
if (udev->bus->methods->set_hw_power != NULL) {
(udev->bus->methods->set_hw_power) (udev->bus);
}
}
}
#endif
/*------------------------------------------------------------------------*
* usb_peer_should_wakeup
*
* This function returns non-zero if the current device should wake up.
*------------------------------------------------------------------------*/
static uint8_t
usb_peer_should_wakeup(struct usb_device *udev)
{
return (((udev->power_mode == USB_POWER_MODE_ON) &&
(udev->flags.usb_mode == USB_MODE_HOST)) ||
(udev->driver_added_refcount != udev->bus->driver_added_refcount) ||
(udev->re_enumerate_wait != USB_RE_ENUM_DONE) ||
(udev->pwr_save.type_refs[UE_ISOCHRONOUS] != 0) ||
(udev->pwr_save.write_refs != 0) ||
((udev->pwr_save.read_refs != 0) &&
(udev->flags.usb_mode == USB_MODE_HOST) &&
(usb_peer_can_wakeup(udev) == 0)));
}
/*------------------------------------------------------------------------*
* usb_bus_powerd
*
* This function implements the USB power daemon and is called
* regularly from the USB explore thread.
*------------------------------------------------------------------------*/
#if USB_HAVE_POWERD
void
usb_bus_powerd(struct usb_bus *bus)
{
struct usb_device *udev;
usb_ticks_t temp;
usb_ticks_t limit;
usb_ticks_t mintime;
usb_size_t type_refs[5];
uint8_t x;
limit = usb_power_timeout;
if (limit == 0)
limit = hz;
else if (limit > 255)
limit = 255 * hz;
else
limit = limit * hz;
DPRINTF("bus=%p\n", bus);
USB_BUS_LOCK(bus);
/*
* The root HUB device is never suspended
* and we simply skip it.
*/
for (x = USB_ROOT_HUB_ADDR + 1;
x != bus->devices_max; x++) {
udev = bus->devices[x];
if (udev == NULL)
continue;
temp = ticks - udev->pwr_save.last_xfer_time;
if (usb_peer_should_wakeup(udev)) {
/* check if we are suspended */
if (udev->flags.self_suspended != 0) {
USB_BUS_UNLOCK(bus);
usb_dev_resume_peer(udev);
USB_BUS_LOCK(bus);
}
} else if ((temp >= limit) &&
(udev->flags.usb_mode == USB_MODE_HOST) &&
(udev->flags.self_suspended == 0)) {
/* try to do suspend */
USB_BUS_UNLOCK(bus);
usb_dev_suspend_peer(udev);
USB_BUS_LOCK(bus);
}
}
/* reset counters */
mintime = (usb_ticks_t)-1;
type_refs[0] = 0;
type_refs[1] = 0;
type_refs[2] = 0;
type_refs[3] = 0;
type_refs[4] = 0;
/* Re-loop all the devices to get the actual state */
for (x = USB_ROOT_HUB_ADDR + 1;
x != bus->devices_max; x++) {
udev = bus->devices[x];
if (udev == NULL)
continue;
/* we found a non-Root-Hub USB device */
type_refs[4] += 1;
/* "last_xfer_time" can be updated by a resume */
temp = ticks - udev->pwr_save.last_xfer_time;
/*
* Compute minimum time since last transfer for the complete
* bus:
*/
if (temp < mintime)
mintime = temp;
if (udev->flags.self_suspended == 0) {
type_refs[0] += udev->pwr_save.type_refs[0];
type_refs[1] += udev->pwr_save.type_refs[1];
type_refs[2] += udev->pwr_save.type_refs[2];
type_refs[3] += udev->pwr_save.type_refs[3];
}
}
if (mintime >= (usb_ticks_t)(1 * hz)) {
/* recompute power masks */
DPRINTF("Recomputing power masks\n");
bus->hw_power_state = 0;
if (type_refs[UE_CONTROL] != 0)
bus->hw_power_state |= USB_HW_POWER_CONTROL;
if (type_refs[UE_BULK] != 0)
bus->hw_power_state |= USB_HW_POWER_BULK;
if (type_refs[UE_INTERRUPT] != 0)
bus->hw_power_state |= USB_HW_POWER_INTERRUPT;
if (type_refs[UE_ISOCHRONOUS] != 0)
bus->hw_power_state |= USB_HW_POWER_ISOC;
if (type_refs[4] != 0)
bus->hw_power_state |= USB_HW_POWER_NON_ROOT_HUB;
}
USB_BUS_UNLOCK(bus);
if (bus->methods->set_hw_power != NULL) {
/* always update hardware power! */
(bus->methods->set_hw_power) (bus);
}
return;
}
#endif
/*------------------------------------------------------------------------*
* usb_dev_resume_peer
*
* This function will resume an USB peer and do the required USB
* signalling to get an USB device out of the suspended state.
*------------------------------------------------------------------------*/
static void
usb_dev_resume_peer(struct usb_device *udev)
{
struct usb_bus *bus;
int err;
/* be NULL safe */
if (udev == NULL)
return;
/* check if already resumed */
if (udev->flags.self_suspended == 0)
return;
/* we need a parent HUB to do resume */
if (udev->parent_hub == NULL)
return;
DPRINTF("udev=%p\n", udev);
if ((udev->flags.usb_mode == USB_MODE_DEVICE) &&
(udev->flags.remote_wakeup == 0)) {
/*
* If the host did not set the remote wakeup feature, we can
* not wake it up either!
*/
DPRINTF("remote wakeup is not set!\n");
return;
}
/* get bus pointer */
bus = udev->bus;
/* resume parent hub first */
usb_dev_resume_peer(udev->parent_hub);
/* reduce chance of instant resume failure by waiting a little bit */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(20));
if (usb_device_20_compatible(udev)) {
/* resume current port (Valid in Host and Device Mode) */
err = usbd_req_clear_port_feature(udev->parent_hub,
NULL, udev->port_no, UHF_PORT_SUSPEND);
if (err) {
DPRINTFN(0, "Resuming port failed\n");
return;
}
} else {
/* resume current port (Valid in Host and Device Mode) */
err = usbd_req_set_port_link_state(udev->parent_hub,
NULL, udev->port_no, UPS_PORT_LS_U0);
if (err) {
DPRINTFN(0, "Resuming port failed\n");
return;
}
}
/* resume settle time */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(usb_port_resume_delay));
if (bus->methods->device_resume != NULL) {
/* resume USB device on the USB controller */
(bus->methods->device_resume) (udev);
}
USB_BUS_LOCK(bus);
/* set that this device is now resumed */
udev->flags.self_suspended = 0;
#if USB_HAVE_POWERD
/* make sure that we don't go into suspend right away */
udev->pwr_save.last_xfer_time = ticks;
/* make sure the needed power masks are on */
if (udev->pwr_save.type_refs[UE_CONTROL] != 0)
bus->hw_power_state |= USB_HW_POWER_CONTROL;
if (udev->pwr_save.type_refs[UE_BULK] != 0)
bus->hw_power_state |= USB_HW_POWER_BULK;
if (udev->pwr_save.type_refs[UE_INTERRUPT] != 0)
bus->hw_power_state |= USB_HW_POWER_INTERRUPT;
if (udev->pwr_save.type_refs[UE_ISOCHRONOUS] != 0)
bus->hw_power_state |= USB_HW_POWER_ISOC;
#endif
USB_BUS_UNLOCK(bus);
if (bus->methods->set_hw_power != NULL) {
/* always update hardware power! */
(bus->methods->set_hw_power) (bus);
}
usbd_sr_lock(udev);
/* notify all sub-devices about resume */
err = usb_suspend_resume(udev, 0);
usbd_sr_unlock(udev);
/* check if peer has wakeup capability */
if (usb_peer_can_wakeup(udev)) {
/* clear remote wakeup */
err = usbd_req_clear_device_feature(udev,
NULL, UF_DEVICE_REMOTE_WAKEUP);
if (err) {
DPRINTFN(0, "Clearing device "
"remote wakeup failed: %s\n",
usbd_errstr(err));
}
}
}
/*------------------------------------------------------------------------*
* usb_dev_suspend_peer
*
* This function will suspend an USB peer and do the required USB
* signalling to get an USB device into the suspended state.
*------------------------------------------------------------------------*/
static void
usb_dev_suspend_peer(struct usb_device *udev)
{
struct usb_device *child;
int err;
uint8_t x;
uint8_t nports;
repeat:
/* be NULL safe */
if (udev == NULL)
return;
/* check if already suspended */
if (udev->flags.self_suspended)
return;
/* we need a parent HUB to do suspend */
if (udev->parent_hub == NULL)
return;
DPRINTF("udev=%p\n", udev);
/* check if the current device is a HUB */
if (udev->hub != NULL) {
nports = udev->hub->nports;
/* check if all devices on the HUB are suspended */
for (x = 0; x != nports; x++) {
child = usb_bus_port_get_device(udev->bus,
udev->hub->ports + x);
if (child == NULL)
continue;
if (child->flags.self_suspended)
continue;
DPRINTFN(1, "Port %u is busy on the HUB!\n", x + 1);
return;
}
}
if (usb_peer_can_wakeup(udev)) {
/*
* This request needs to be done before we set
* "udev->flags.self_suspended":
*/
/* allow device to do remote wakeup */
err = usbd_req_set_device_feature(udev,
NULL, UF_DEVICE_REMOTE_WAKEUP);
if (err) {
DPRINTFN(0, "Setting device "
"remote wakeup failed\n");
}
}
USB_BUS_LOCK(udev->bus);
/*
* Checking for suspend condition and setting suspended bit
* must be atomic!
*/
err = usb_peer_should_wakeup(udev);
if (err == 0) {
/*
* Set that this device is suspended. This variable
* must be set before calling USB controller suspend
* callbacks.
*/
udev->flags.self_suspended = 1;
}
USB_BUS_UNLOCK(udev->bus);
if (err != 0) {
if (usb_peer_can_wakeup(udev)) {
/* allow device to do remote wakeup */
err = usbd_req_clear_device_feature(udev,
NULL, UF_DEVICE_REMOTE_WAKEUP);
if (err) {
DPRINTFN(0, "Setting device "
"remote wakeup failed\n");
}
}
if (udev->flags.usb_mode == USB_MODE_DEVICE) {
/* resume parent HUB first */
usb_dev_resume_peer(udev->parent_hub);
/* reduce chance of instant resume failure by waiting a little bit */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(20));
/* resume current port (Valid in Host and Device Mode) */
err = usbd_req_clear_port_feature(udev->parent_hub,
NULL, udev->port_no, UHF_PORT_SUSPEND);
/* resume settle time */
usb_pause_mtx(NULL, USB_MS_TO_TICKS(usb_port_resume_delay));
}
DPRINTF("Suspend was cancelled!\n");
return;
}
usbd_sr_lock(udev);
/* notify all sub-devices about suspend */
err = usb_suspend_resume(udev, 1);
usbd_sr_unlock(udev);
if (udev->bus->methods->device_suspend != NULL) {
usb_timeout_t temp;
/* suspend device on the USB controller */
(udev->bus->methods->device_suspend) (udev);
/* do DMA delay */
temp = usbd_get_dma_delay(udev);
if (temp != 0)
usb_pause_mtx(NULL, USB_MS_TO_TICKS(temp));
}
if (usb_device_20_compatible(udev)) {
/* suspend current port */
err = usbd_req_set_port_feature(udev->parent_hub,
NULL, udev->port_no, UHF_PORT_SUSPEND);
if (err) {
DPRINTFN(0, "Suspending port failed\n");
return;
}
} else {
/* suspend current port */
err = usbd_req_set_port_link_state(udev->parent_hub,
NULL, udev->port_no, UPS_PORT_LS_U3);
if (err) {
DPRINTFN(0, "Suspending port failed\n");
return;
}
}
udev = udev->parent_hub;
goto repeat;
}
/*------------------------------------------------------------------------*
* usbd_set_power_mode
*
* This function will set the power mode, see USB_POWER_MODE_XXX for a
* USB device.
*------------------------------------------------------------------------*/
void
usbd_set_power_mode(struct usb_device *udev, uint8_t power_mode)
{
/* filter input argument */
if ((power_mode != USB_POWER_MODE_ON) &&
(power_mode != USB_POWER_MODE_OFF))
power_mode = USB_POWER_MODE_SAVE;
power_mode = usbd_filter_power_mode(udev, power_mode);
udev->power_mode = power_mode; /* update copy of power mode */
#if USB_HAVE_POWERD
usb_bus_power_update(udev->bus);
#else
usb_needs_explore(udev->bus, 0 /* no probe */ );
#endif
}
/*------------------------------------------------------------------------*
* usbd_filter_power_mode
*
* This function filters the power mode based on hardware requirements.
*------------------------------------------------------------------------*/
uint8_t
usbd_filter_power_mode(struct usb_device *udev, uint8_t power_mode)
{
const struct usb_bus_methods *mtod;
int8_t temp;
mtod = udev->bus->methods;
temp = -1;
if (mtod->get_power_mode != NULL)
(mtod->get_power_mode) (udev, &temp);
/* check if we should not filter */
if (temp < 0)
return (power_mode);
/* use fixed power mode given by hardware driver */
return (temp);
}
/*------------------------------------------------------------------------*
* usbd_start_re_enumerate
*
* This function starts re-enumeration of the given USB device. This
* function does not need to be called BUS-locked. This function does
* not wait until the re-enumeration is completed.
*------------------------------------------------------------------------*/
void
usbd_start_re_enumerate(struct usb_device *udev)
{
if (udev->re_enumerate_wait == USB_RE_ENUM_DONE) {
udev->re_enumerate_wait = USB_RE_ENUM_START;
usb_needs_explore(udev->bus, 0);
}
}
Reference in New Issue View Git Blame Copy Permalink