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e280503373
freebsd-dev/sys/dev/usb/usb_hub.c
Andrew Thompson e280503373 MFp4 //depot/projects/usb@157958 
- We don't need to exit the Giant mutex when sleeping. This is done
  automatically. Replace Giant by NULL mutex for all control requests in the
  enumeration path.
- Optimise away duplicate alternate interface selection requests in USB Host
  mode.

Submitted by:	Hans Petter Selasky
2009-02-24 03:41:52 +00:00

1843 lines
46 KiB
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/* $FreeBSD$ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc. All rights reserved.
* Copyright (c) 1998 Lennart Augustsson. All rights reserved.
* Copyright (c) 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 spec: http://www.usb.org/developers/docs/usbspec.zip
*/
#include <dev/usb/usb_defs.h>
#include <dev/usb/usb_mfunc.h>
#include <dev/usb/usb_error.h>
#include <dev/usb/usb.h>
#include <dev/usb/usb_ioctl.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>
#define UHUB_INTR_INTERVAL 250 /* ms */
#define UHUB_N_TRANSFER 1
#if USB_DEBUG
static int uhub_debug = 0;
SYSCTL_NODE(_hw_usb2, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB HUB");
SYSCTL_INT(_hw_usb2_uhub, OID_AUTO, debug, CTLFLAG_RW, &uhub_debug, 0,
"Debug level");
#endif
static int usb2_power_timeout = 30; /* seconds */
SYSCTL_INT(_hw_usb2, OID_AUTO, power_timeout, CTLFLAG_RW,
&usb2_power_timeout, 0, "USB power timeout");
struct uhub_current_state {
uint16_t port_change;
uint16_t port_status;
};
struct uhub_softc {
struct uhub_current_state sc_st;/* current state */
device_t sc_dev; /* base device */
struct usb2_device *sc_udev; /* USB device */
struct usb2_xfer *sc_xfer[UHUB_N_TRANSFER]; /* interrupt xfer */
uint8_t sc_flags;
#define UHUB_FLAG_DID_EXPLORE 0x01
char sc_name[32];
};
#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)
/* 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 usb2_callback_t uhub_intr_callback;
static void usb2_dev_resume_peer(struct usb2_device *udev);
static void usb2_dev_suspend_peer(struct usb2_device *udev);
static const struct usb2_config uhub_config[UHUB_N_TRANSFER] = {
[0] = {
.type = UE_INTERRUPT,
.endpoint = UE_ADDR_ANY,
.direction = UE_DIR_ANY,
.mh.timeout = 0,
.mh.flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
.mh.bufsize = 0, /* use wMaxPacketSize */
.mh.callback = &uhub_intr_callback,
.mh.interval = UHUB_INTR_INTERVAL,
},
};
/*
* driver instance for "hub" connected to "usb"
* and "hub" connected to "hub"
*/
static devclass_t uhub_devclass;
static driver_t uhub_driver =
{
.name = "ushub",
.methods = (device_method_t[]){
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(device_shutdown, bus_generic_shutdown),
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),
{0, 0}
},
.size = sizeof(struct uhub_softc)
};
DRIVER_MODULE(ushub, usbus, uhub_driver, uhub_devclass, 0, 0);
DRIVER_MODULE(ushub, ushub, uhub_driver, uhub_devclass, NULL, 0);
static void
uhub_intr_callback(struct usb2_xfer *xfer)
{
struct uhub_softc *sc = xfer->priv_sc;
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:
*/
usb2_needs_explore(sc->sc_udev->bus, 0);
case USB_ST_SETUP:
xfer->frlengths[0] = xfer->max_data_length;
usb2_start_hardware(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.
*/
xfer->flags.stall_pipe = 1;
xfer->frlengths[0] = xfer->max_data_length;
usb2_start_hardware(xfer);
}
break;
}
}
/*------------------------------------------------------------------------*
* uhub_explore_sub - subroutine
*
* Return values:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb2_error_t
uhub_explore_sub(struct uhub_softc *sc, struct usb2_port *up)
{
struct usb2_bus *bus;
struct usb2_device *child;
uint8_t refcount;
usb2_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 = usb2_bus_port_get_device(bus, up);
if (child == NULL) {
/* nothing to do */
goto done;
}
/* check if probe and attach should be done */
if (child->driver_added_refcount != refcount) {
child->driver_added_refcount = refcount;
err = usb2_probe_and_attach(child,
USB_IFACE_INDEX_ANY);
if (err) {
goto done;
}
}
/* start control transfer, if device mode */
if (child->flags.usb2_mode == USB_MODE_DEVICE) {
usb2_default_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 usb2_error_t
uhub_read_port_status(struct uhub_softc *sc, uint8_t portno)
{
struct usb2_port_status ps;
usb2_error_t err;
err = usb2_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, usb2_errstr(err));
return (err);
}
/*------------------------------------------------------------------------*
* uhub_reattach_port
*
* Returns:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb2_error_t
uhub_reattach_port(struct uhub_softc *sc, uint8_t portno)
{
struct usb2_device *child;
struct usb2_device *udev;
usb2_error_t err;
uint8_t timeout;
uint8_t speed;
uint8_t usb2_mode;
DPRINTF("reattaching port %d\n", portno);
err = 0;
timeout = 0;
udev = sc->sc_udev;
child = usb2_bus_port_get_device(udev->bus,
udev->hub->ports + portno - 1);
repeat:
/* first clear the port connection change bit */
err = usb2_req_clear_port_feature(udev, NULL,
portno, UHF_C_PORT_CONNECTION);
if (err) {
goto error;
}
/* detach any existing devices */
if (child) {
usb2_detach_device(child, USB_IFACE_INDEX_ANY, 1);
usb2_free_device(child);
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 */
if (!(sc->sc_st.port_status & UPS_PORT_POWER)) {
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) {
DPRINTF("Port %d was still "
"suspended, clearing.\n", portno);
err = usb2_req_clear_port_feature(sc->sc_udev,
NULL, portno, UHF_PORT_SUSPEND);
}
/* USB Host Mode */
/* wait for maximum device power up time */
usb2_pause_mtx(NULL,
USB_MS_TO_TICKS(USB_PORT_POWERUP_DELAY));
/* reset port, which implies enabling it */
err = usb2_req_reset_port(udev, NULL, portno);
if (err) {
DPRINTFN(0, "port %d reset "
"failed, error=%s\n",
portno, usb2_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;
default:
/* same speed like parent */
speed = udev->speed;
break;
}
/*
* Figure out the device mode
*
* NOTE: This part is currently FreeBSD specific.
*/
if (sc->sc_st.port_status & UPS_PORT_MODE_DEVICE)
usb2_mode = USB_MODE_DEVICE;
else
usb2_mode = USB_MODE_HOST;
/* need to create a new child */
child = usb2_alloc_device(sc->sc_dev, udev->bus, udev,
udev->depth + 1, portno - 1, portno, speed, usb2_mode);
if (child == NULL) {
DPRINTFN(0, "could not allocate new device!\n");
goto error;
}
return (0); /* success */
error:
if (child) {
usb2_detach_device(child, USB_IFACE_INDEX_ANY, 1);
usb2_free_device(child);
child = NULL;
}
if (err == 0) {
if (sc->sc_st.port_status & UPS_PORT_ENABLED) {
err = usb2_req_clear_port_feature(
sc->sc_udev, NULL,
portno, UHF_PORT_ENABLE);
}
}
if (err) {
DPRINTFN(0, "device problem (%s), "
"disabling port %d\n", usb2_errstr(err), portno);
}
return (err);
}
/*------------------------------------------------------------------------*
* uhub_suspend_resume_port
*
* Returns:
* 0: Success
* Else: A control transaction failed
*------------------------------------------------------------------------*/
static usb2_error_t
uhub_suspend_resume_port(struct uhub_softc *sc, uint8_t portno)
{
struct usb2_device *child;
struct usb2_device *udev;
uint8_t is_suspend;
usb2_error_t err;
DPRINTF("port %d\n", portno);
udev = sc->sc_udev;
child = usb2_bus_port_get_device(udev->bus,
udev->hub->ports + portno - 1);
/* first clear the port suspend change bit */
err = usb2_req_clear_port_feature(udev, NULL,
portno, UHF_C_PORT_SUSPEND);
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;
}
/* get current state */
if (sc->sc_st.port_status & UPS_SUSPEND) {
is_suspend = 1;
} else {
is_suspend = 0;
}
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)
usb2_dev_resume_peer(child);
else if (child->flags.usb2_mode == USB_MODE_DEVICE)
usb2_dev_suspend_peer(child);
}
done:
return (err);
}
/*------------------------------------------------------------------------*
* uhub_explore
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
static usb2_error_t
uhub_explore(struct usb2_device *udev)
{
struct usb2_hub *hub;
struct uhub_softc *sc;
struct usb2_port *up;
usb2_error_t err;
uint8_t portno;
uint8_t x;
hub = udev->hub;
sc = hub->hubsoftc;
DPRINTFN(11, "udev=%p addr=%d\n", udev, udev->address);
/* ignore hubs that are too deep */
if (udev->depth > USB_HUB_MAX_DEPTH) {
return (USB_ERR_TOO_DEEP);
}
if (udev->pwr_save.suspended) {
/* need to wait until the child signals resume */
DPRINTF("Device is suspended!\n");
return (0);
}
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 = usb2_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 = usb2_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) {
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;
}
/* 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 usb2_attach_arg *uaa = device_get_ivars(dev);
if (uaa->usb2_mode != USB_MODE_HOST) {
return (ENXIO);
}
/*
* The subclass for USB HUBs is 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);
}
static int
uhub_attach(device_t dev)
{
struct uhub_softc *sc = device_get_softc(dev);
struct usb2_attach_arg *uaa = device_get_ivars(dev);
struct usb2_device *udev = uaa->device;
struct usb2_device *parent_hub = udev->parent_hub;
struct usb2_hub *hub;
struct usb2_hub_descriptor hubdesc;
uint16_t pwrdly;
uint8_t x;
uint8_t nports;
uint8_t portno;
uint8_t removable;
uint8_t iface_index;
usb2_error_t err;
sc->sc_udev = udev;
sc->sc_dev = dev;
snprintf(sc->sc_name, sizeof(sc->sc_name), "%s",
device_get_nameunit(dev));
device_set_usb2_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 (udev->depth > USB_HUB_MAX_DEPTH) {
DPRINTFN(0, "hub depth, %d, exceeded. HUB ignored!\n",
USB_HUB_MAX_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;
}
/* get HUB descriptor */
DPRINTFN(2, "getting HUB descriptor\n");
/* assuming that there is one port */
err = usb2_req_get_hub_descriptor(udev, NULL, &hubdesc, 1);
nports = hubdesc.bNbrPorts;
if (!err && (nports >= 8)) {
/* get complete HUB descriptor */
err = usb2_req_get_hub_descriptor(udev, NULL, &hubdesc, nports);
}
if (err) {
DPRINTFN(0, "getting hub descriptor failed,"
"error=%s\n", usb2_errstr(err));
goto error;
}
if (hubdesc.bNbrPorts != nports) {
DPRINTFN(0, "number of ports changed!\n");
goto error;
}
if (nports == 0) {
DPRINTFN(0, "portless HUB!\n");
goto error;
}
hub = malloc(sizeof(hub[0]) + (sizeof(hub->ports[0]) * nports),
M_USBDEV, M_WAITOK | M_ZERO);
if (hub == NULL) {
goto error;
}
udev->hub = hub;
/* init FULL-speed ISOCHRONOUS schedule */
usb2_fs_isoc_schedule_init_all(hub->fs_isoc_schedule);
/* initialize HUB structure */
hub->hubsoftc = sc;
hub->explore = &uhub_explore;
hub->nports = hubdesc.bNbrPorts;
hub->hubudev = udev;
/* 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;
err = usb2_transfer_setup(udev, &iface_index, sc->sc_xfer,
uhub_config, UHUB_N_TRANSFER, sc, &Giant);
if (err) {
DPRINTFN(0, "cannot setup interrupt transfer, "
"errstr=%s!\n", usb2_errstr(err));
goto error;
}
/* wait with power off for a while */
usb2_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;
pwrdly = ((hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR) +
USB_EXTRA_POWER_UP_TIME);
for (x = 0; x != nports; x++) {
/* set up data structures */
struct usb2_port *up = hub->ports + x;
up->device_index = 0;
up->restartcnt = 0;
portno = x + 1;
/* check if port is removable */
if (!UHD_NOT_REMOV(&hubdesc, portno)) {
removable++;
}
if (!err) {
/* turn the power on */
err = usb2_req_set_port_feature(udev, NULL,
portno, UHF_PORT_POWER);
}
if (err) {
DPRINTFN(0, "port %d power on failed, %s\n",
portno, usb2_errstr(err));
}
DPRINTF("turn on port %d power\n",
portno);
/* wait for stable power */
usb2_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 */
USB_XFER_LOCK(sc->sc_xfer[0]);
usb2_transfer_start(sc->sc_xfer[0]);
USB_XFER_UNLOCK(sc->sc_xfer[0]);
/* Enable automatic power save on all USB HUBs */
usb2_set_power_mode(udev, USB_POWER_MODE_SAVE);
return (0);
error:
usb2_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER);
if (udev->hub) {
free(udev->hub, M_USBDEV);
udev->hub = NULL;
}
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 usb2_hub *hub = sc->sc_udev->hub;
struct usb2_device *child;
uint8_t x;
/* detach all children first */
bus_generic_detach(dev);
if (hub == NULL) { /* must be partially working */
return (0);
}
for (x = 0; x != hub->nports; x++) {
child = usb2_bus_port_get_device(sc->sc_udev->bus, hub->ports + x);
if (child == NULL) {
continue;
}
/*
* Subdevices are not freed, because the caller of
* uhub_detach() will do that.
*/
usb2_detach_device(child, USB_IFACE_INDEX_ANY, 0);
usb2_free_device(child);
child = NULL;
}
usb2_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER);
free(hub, M_USBDEV);
sc->sc_udev->hub = NULL;
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)
{
usb2_needs_explore_all();
}
struct hub_result {
struct usb2_device *udev;
uint8_t portno;
uint8_t iface_index;
};
static void
uhub_find_iface_index(struct usb2_hub *hub, device_t child,
struct hub_result *res)
{
struct usb2_interface *iface;
struct usb2_device *udev;
uint8_t nports;
uint8_t x;
uint8_t i;
nports = hub->nports;
for (x = 0; x != nports; x++) {
udev = usb2_bus_port_get_device(hub->hubudev->bus,
hub->ports + x);
if (!udev) {
continue;
}
for (i = 0; i != USB_IFACE_MAX; i++) {
iface = usb2_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 = device_get_softc(parent);
struct usb2_hub *hub = sc->sc_udev->hub;
struct hub_result res;
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, "port=%u interface=%u",
res.portno, 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 = device_get_softc(parent);
struct usb2_hub *hub = sc->sc_udev->hub;
struct usb2_interface *iface;
struct hub_result res;
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 = usb2_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\" "
"intclass=0x%02x intsubclass=0x%02x",
UGETW(res.udev->ddesc.idVendor),
UGETW(res.udev->ddesc.idProduct),
res.udev->ddesc.bDeviceClass,
res.udev->ddesc.bDeviceSubClass,
res.udev->serial,
iface->idesc->bInterfaceClass,
iface->idesc->bInterfaceSubClass);
} 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!
*
*/
/*------------------------------------------------------------------------*
* usb2_intr_find_best_slot
*
* Return value:
* The best Transaction Translation slot for an interrupt endpoint.
*------------------------------------------------------------------------*/
static uint8_t
usb2_intr_find_best_slot(uint32_t *ptr, uint8_t start, uint8_t end)
{
uint32_t max = 0xffffffff;
uint8_t x;
uint8_t y;
y = 0;
/* find the last slot with lesser used bandwidth */
for (x = start; x < end; x++) {
if (max >= ptr[x]) {
max = ptr[x];
y = x;
}
}
return (y);
}
/*------------------------------------------------------------------------*
* usb2_intr_schedule_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.
*
* Returns:
* The slot on which the bandwidth update was done.
*------------------------------------------------------------------------*/
uint8_t
usb2_intr_schedule_adjust(struct usb2_device *udev, int16_t len, uint8_t slot)
{
struct usb2_bus *bus = udev->bus;
struct usb2_hub *hub;
uint8_t speed;
USB_BUS_LOCK_ASSERT(bus, MA_OWNED);
speed = usb2_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 = bus->devices[udev->hs_hub_addr]->hub;
if (slot >= USB_HS_MICRO_FRAMES_MAX) {
slot = usb2_intr_find_best_slot(hub->uframe_usage,
USB_FS_ISOC_UFRAME_MAX, 6);
}
hub->uframe_usage[slot] += len;
bus->uframe_usage[slot] += len;
break;
default:
if (slot >= USB_HS_MICRO_FRAMES_MAX) {
slot = usb2_intr_find_best_slot(bus->uframe_usage, 0,
USB_HS_MICRO_FRAMES_MAX);
}
bus->uframe_usage[slot] += len;
break;
}
return (slot);
}
/*------------------------------------------------------------------------*
* usb2_fs_isoc_schedule_init_sub
*
* This function initialises an USB FULL speed isochronous schedule
* entry.
*------------------------------------------------------------------------*/
static void
usb2_fs_isoc_schedule_init_sub(struct usb2_fs_isoc_schedule *fss)
{
fss->total_bytes = (USB_FS_ISOC_UFRAME_MAX *
USB_FS_BYTES_PER_HS_UFRAME);
fss->frame_bytes = (USB_FS_BYTES_PER_HS_UFRAME);
fss->frame_slot = 0;
}
/*------------------------------------------------------------------------*
* usb2_fs_isoc_schedule_init_all
*
* This function will reset the complete USB FULL speed isochronous
* bandwidth schedule.
*------------------------------------------------------------------------*/
void
usb2_fs_isoc_schedule_init_all(struct usb2_fs_isoc_schedule *fss)
{
struct usb2_fs_isoc_schedule *fss_end = fss + USB_ISOC_TIME_MAX;
while (fss != fss_end) {
usb2_fs_isoc_schedule_init_sub(fss);
fss++;
}
}
/*------------------------------------------------------------------------*
* usb2_isoc_time_expand
*
* This function will expand the time counter from 7-bit to 16-bit.
*
* Returns:
* 16-bit isochronous time counter.
*------------------------------------------------------------------------*/
uint16_t
usb2_isoc_time_expand(struct usb2_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);
}
/*------------------------------------------------------------------------*
* usb2_fs_isoc_schedule_isoc_time_expand
*
* This function does multiple things. First of all it will expand the
* passed isochronous time, which is the return value. Then it will
* store where the current FULL speed isochronous schedule is
* positioned in time and where the end is. See "pp_start" and
* "pp_end" arguments.
*
* Returns:
* Expanded version of "isoc_time".
*
* NOTE: This function depends on being called regularly with
* intervals less than "USB_ISOC_TIME_MAX".
*------------------------------------------------------------------------*/
uint16_t
usb2_fs_isoc_schedule_isoc_time_expand(struct usb2_device *udev,
struct usb2_fs_isoc_schedule **pp_start,
struct usb2_fs_isoc_schedule **pp_end,
uint16_t isoc_time)
{
struct usb2_fs_isoc_schedule *fss_end;
struct usb2_fs_isoc_schedule *fss_a;
struct usb2_fs_isoc_schedule *fss_b;
struct usb2_hub *hs_hub;
isoc_time = usb2_isoc_time_expand(udev->bus, isoc_time);
hs_hub = udev->bus->devices[udev->hs_hub_addr]->hub;
if (hs_hub != NULL) {
fss_a = hs_hub->fs_isoc_schedule +
(hs_hub->isoc_last_time % USB_ISOC_TIME_MAX);
hs_hub->isoc_last_time = isoc_time;
fss_b = hs_hub->fs_isoc_schedule +
(isoc_time % USB_ISOC_TIME_MAX);
fss_end = hs_hub->fs_isoc_schedule + USB_ISOC_TIME_MAX;
*pp_start = hs_hub->fs_isoc_schedule;
*pp_end = fss_end;
while (fss_a != fss_b) {
if (fss_a == fss_end) {
fss_a = hs_hub->fs_isoc_schedule;
continue;
}
usb2_fs_isoc_schedule_init_sub(fss_a);
fss_a++;
}
} else {
*pp_start = NULL;
*pp_end = NULL;
}
return (isoc_time);
}
/*------------------------------------------------------------------------*
* usb2_fs_isoc_schedule_alloc
*
* This function will allocate bandwidth for an isochronous FULL speed
* transaction in the FULL speed schedule. The microframe slot where
* the transaction should be started is stored in the byte pointed to
* by "pstart". The "len" argument specifies the length of the
* transaction in bytes.
*
* Returns:
* 0: Success
* Else: Error
*------------------------------------------------------------------------*/
uint8_t
usb2_fs_isoc_schedule_alloc(struct usb2_fs_isoc_schedule *fss,
uint8_t *pstart, uint16_t len)
{
uint8_t slot = fss->frame_slot;
/* Compute overhead and bit-stuffing */
len += 8;
len *= 7;
len /= 6;
if (len > fss->total_bytes) {
*pstart = 0; /* set some dummy value */
return (1); /* error */
}
if (len > 0) {
fss->total_bytes -= len;
while (len >= fss->frame_bytes) {
len -= fss->frame_bytes;
fss->frame_bytes = USB_FS_BYTES_PER_HS_UFRAME;
fss->frame_slot++;
}
fss->frame_bytes -= len;
}
*pstart = slot;
return (0); /* success */
}
/*------------------------------------------------------------------------*
* usb2_bus_port_get_device
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
struct usb2_device *
usb2_bus_port_get_device(struct usb2_bus *bus, struct usb2_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]);
}
/*------------------------------------------------------------------------*
* usb2_bus_port_set_device
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
void
usb2_bus_port_set_device(struct usb2_bus *bus, struct usb2_port *up,
struct usb2_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) {
mtx_lock(&usb2_ref_lock);
bus->devices[device_index] = udev;
mtx_unlock(&usb2_ref_lock);
}
/*
* Debug print
*/
DPRINTFN(2, "bus %p devices[%u] = %p\n", bus, device_index, udev);
}
/*------------------------------------------------------------------------*
* usb2_needs_explore
*
* This functions is called when the USB event thread needs to run.
*------------------------------------------------------------------------*/
void
usb2_needs_explore(struct usb2_bus *bus, uint8_t do_probe)
{
DPRINTF("\n");
if (bus == NULL) {
DPRINTF("No bus pointer!\n");
return;
}
USB_BUS_LOCK(bus);
if (do_probe) {
bus->do_probe = 1;
}
if (usb2_proc_msignal(&bus->explore_proc,
&bus->explore_msg[0], &bus->explore_msg[1])) {
/* ignore */
}
USB_BUS_UNLOCK(bus);
}
/*------------------------------------------------------------------------*
* usb2_needs_explore_all
*
* This function is called whenever a new driver is loaded and will
* cause that all USB busses are re-explored.
*------------------------------------------------------------------------*/
void
usb2_needs_explore_all(void)
{
struct usb2_bus *bus;
devclass_t dc;
device_t dev;
int max;
DPRINTFN(3, "\n");
dc = usb2_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) {
usb2_needs_explore(bus, 1);
}
}
max--;
}
}
/*------------------------------------------------------------------------*
* usb2_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.
*------------------------------------------------------------------------*/
void
usb2_bus_power_update(struct usb2_bus *bus)
{
usb2_needs_explore(bus, 0 /* no probe */ );
}
/*------------------------------------------------------------------------*
* usb2_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.
*------------------------------------------------------------------------*/
void
usb2_transfer_power_ref(struct usb2_xfer *xfer, int val)
{
static const uint32_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 usb2_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->pipe->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.usb2_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 (udev->pwr_save.suspended)
needs_explore =
(udev->pwr_save.write_refs != 0) ||
((udev->pwr_save.read_refs != 0) &&
(usb2_peer_can_wakeup(udev) == 0));
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;
}
USB_BUS_UNLOCK(udev->bus);
if (needs_explore) {
DPRINTF("update\n");
usb2_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);
}
}
return;
}
/*------------------------------------------------------------------------*
* usb2_bus_powerd
*
* This function implements the USB power daemon and is called
* regularly from the USB explore thread.
*------------------------------------------------------------------------*/
void
usb2_bus_powerd(struct usb2_bus *bus)
{
struct usb2_device *udev;
unsigned int temp;
unsigned int limit;
unsigned int mintime;
uint32_t type_refs[5];
uint8_t x;
uint8_t rem_wakeup;
limit = usb2_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;
rem_wakeup = usb2_peer_can_wakeup(udev);
temp = ticks - udev->pwr_save.last_xfer_time;
if ((udev->power_mode == USB_POWER_MODE_ON) ||
(udev->pwr_save.type_refs[UE_ISOCHRONOUS] != 0) ||
(udev->pwr_save.write_refs != 0) ||
((udev->pwr_save.read_refs != 0) &&
(rem_wakeup == 0))) {
/* check if we are suspended */
if (udev->pwr_save.suspended != 0) {
USB_BUS_UNLOCK(bus);
usb2_dev_resume_peer(udev);
USB_BUS_LOCK(bus);
}
} else if (temp >= limit) {
/* check if we are not suspended */
if (udev->pwr_save.suspended == 0) {
USB_BUS_UNLOCK(bus);
usb2_dev_suspend_peer(udev);
USB_BUS_LOCK(bus);
}
}
}
/* reset counters */
mintime = 0 - 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->pwr_save.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 >= (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;
}
/*------------------------------------------------------------------------*
* usb2_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
usb2_dev_resume_peer(struct usb2_device *udev)
{
struct usb2_bus *bus;
int err;
/* be NULL safe */
if (udev == NULL)
return;
/* check if already resumed */
if (udev->pwr_save.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.usb2_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 */
usb2_dev_resume_peer(udev->parent_hub);
/* resume current port (Valid in Host and Device Mode) */
err = usb2_req_clear_port_feature(udev->parent_hub,
NULL, udev->port_no, UHF_PORT_SUSPEND);
if (err) {
DPRINTFN(0, "Resuming port failed!\n");
return;
}
/* resume settle time */
usb2_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->pwr_save.suspended = 0;
/* 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;
USB_BUS_UNLOCK(bus);
if (bus->methods->set_hw_power != NULL) {
/* always update hardware power! */
(bus->methods->set_hw_power) (bus);
}
sx_xlock(udev->default_sx + 1);
/* notify all sub-devices about resume */
err = usb2_suspend_resume(udev, 0);
sx_unlock(udev->default_sx + 1);
/* check if peer has wakeup capability */
if (usb2_peer_can_wakeup(udev)) {
/* clear remote wakeup */
err = usb2_req_clear_device_feature(udev,
NULL, UF_DEVICE_REMOTE_WAKEUP);
if (err) {
DPRINTFN(0, "Clearing device "
"remote wakeup failed: %s!\n",
usb2_errstr(err));
}
}
return;
}
/*------------------------------------------------------------------------*
* usb2_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
usb2_dev_suspend_peer(struct usb2_device *udev)
{
struct usb2_device *hub;
struct usb2_device *child;
uint32_t temp;
int err;
uint8_t x;
uint8_t nports;
uint8_t suspend_parent;
repeat:
/* be NULL safe */
if (udev == NULL)
return;
/* check if already suspended */
if (udev->pwr_save.suspended)
return;
/* we need a parent HUB to do suspend */
if (udev->parent_hub == NULL)
return;
DPRINTF("udev=%p\n", udev);
/* check if all devices on the parent hub are suspended */
hub = udev->parent_hub;
if (hub != NULL) {
nports = hub->hub->nports;
suspend_parent = 1;
for (x = 0; x != nports; x++) {
child = usb2_bus_port_get_device(hub->bus,
hub->hub->ports + x);
if (child == NULL)
continue;
if (child->pwr_save.suspended)
continue;
if (child == udev)
continue;
/* another device on the HUB is not suspended */
suspend_parent = 0;
break;
}
} else {
suspend_parent = 0;
}
sx_xlock(udev->default_sx + 1);
/* notify all sub-devices about suspend */
err = usb2_suspend_resume(udev, 1);
sx_unlock(udev->default_sx + 1);
if (usb2_peer_can_wakeup(udev)) {
/* allow device to do remote wakeup */
err = usb2_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);
/*
* Set that this device is suspended. This variable must be set
* before calling USB controller suspend callbacks.
*/
udev->pwr_save.suspended = 1;
USB_BUS_UNLOCK(udev->bus);
if (udev->bus->methods->device_suspend != NULL) {
/* suspend device on the USB controller */
(udev->bus->methods->device_suspend) (udev);
/* do DMA delay */
temp = usb2_get_dma_delay(udev->bus);
usb2_pause_mtx(NULL, USB_MS_TO_TICKS(temp));
}
/* suspend current port */
err = usb2_req_set_port_feature(udev->parent_hub,
NULL, udev->port_no, UHF_PORT_SUSPEND);
if (err) {
DPRINTFN(0, "Suspending port failed\n");
return;
}
if (suspend_parent) {
udev = udev->parent_hub;
goto repeat;
}
return;
}
/*------------------------------------------------------------------------*
* usb2_set_power_mode
*
* This function will set the power mode, see USB_POWER_MODE_XXX for a
* USB device.
*------------------------------------------------------------------------*/
void
usb2_set_power_mode(struct usb2_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;
}
udev->power_mode = power_mode; /* update copy of power mode */
usb2_bus_power_update(udev->bus);
return;
}
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