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freebsd-nq/sys/dev/usb/usb_hub.c
Alfred Perlstein cb18f7d12b - Patch to allow USB controller to resume operation after 
being polled.

         - Remove the need for Giant from the USB HUB driver.

         - Leave device unconfigured instead of disabling the USB port
           when Huawei Autoinstall disk detection triggers. This should
           fix problems that the Huawei device is not detected after
           Autoinstall eject is issued.
         - Reported by: Nikolay Antsiferov

         - Fix memory use after free race for USB character devices.
         - Reported by: Lucius Windschuh

         - Factor out the enumeration lock into three functions to make the
         coming newbus lock conversion more easy.
          - usbd_enum_lock
          - usbd_enum_unlock
          - usbd_enum_is_locked

Submitted by:	hps
2009-08-24 05:05:38 +00:00

1925 lines
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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 <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/linker_set.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/usb_ioctl.h>
#include <dev/usb/usbdi.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
#ifdef USB_DEBUG
static int uhub_debug = 0;
SYSCTL_NODE(_hw_usb, OID_AUTO, uhub, CTLFLAG_RW, 0, "USB HUB");
SYSCTL_INT(_hw_usb_uhub, OID_AUTO, debug, CTLFLAG_RW, &uhub_debug, 0,
"Debug level");
#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 */
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
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 usb_callback_t uhub_intr_callback;
static void usb_dev_resume_peer(struct usb_device *udev);
static void usb_dev_suspend_peer(struct usb_device *udev);
static const struct usb_config uhub_config[UHUB_N_TRANSFER] = {
[0] = {
.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,
},
};
/*
* 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),
{0, 0}
};
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);
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_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 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_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 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;
uint8_t timeout;
DPRINTF("reattaching port %d\n", portno);
err = 0;
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;
}
/* detach any existing devices */
if (child) {
usb_free_device(child,
USB_UNCFG_FLAG_FREE_SUBDEV |
USB_UNCFG_FLAG_FREE_EP0);
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 = usbd_req_clear_port_feature(sc->sc_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;
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)
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) {
usb_free_device(child,
USB_UNCFG_FLAG_FREE_SUBDEV |
USB_UNCFG_FLAG_FREE_EP0);
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);
}
/*------------------------------------------------------------------------*
* 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 */
err = usbd_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)
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);
}
/*------------------------------------------------------------------------*
* 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;
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->flags.self_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 = 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) {
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 usb_attach_arg *uaa = device_get_ivars(dev);
if (uaa->usb_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 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 hubdesc;
uint16_t pwrdly;
uint8_t x;
uint8_t nports;
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);
snprintf(sc->sc_name, sizeof(sc->sc_name), "%s",
device_get_nameunit(dev));
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 (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 = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc, 1);
nports = hubdesc.bNbrPorts;
if (!err && (nports >= 8)) {
/* get complete HUB descriptor */
err = usbd_req_get_hub_descriptor(udev, NULL, &hubdesc, nports);
}
if (err) {
DPRINTFN(0, "getting hub descriptor failed,"
"error=%s\n", usbd_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;
#if USB_HAVE_TT_SUPPORT
/* init FULL-speed ISOCHRONOUS schedule */
usbd_fs_isoc_schedule_init_all(hub->fs_isoc_schedule);
#endif
/* 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;
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;
pwrdly = ((hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR) +
USB_EXTRA_POWER_UP_TIME);
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 */
if (!UHD_NOT_REMOV(&hubdesc, portno)) {
removable++;
}
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 */
if (sc->sc_xfer[0] != NULL) {
mtx_lock(&sc->sc_mtx);
usbd_transfer_start(sc->sc_xfer[0]);
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 (udev->hub) {
free(udev->hub, M_USBDEV);
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_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 = usb_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.
*/
usb_free_device(child,
USB_UNCFG_FLAG_FREE_EP0);
}
usbd_transfer_unsetup(sc->sc_xfer, UHUB_N_TRANSFER);
free(hub, M_USBDEV);
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 = device_get_softc(parent);
struct usb_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 usb_hub *hub = sc->sc_udev->hub;
struct usb_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 = 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 "
"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,
UGETW(res.udev->ddesc.bcdDevice),
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!
*
*/
/*------------------------------------------------------------------------*
* 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)
{
usb_size_t max = 0 - 1;
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);
}
/*------------------------------------------------------------------------*
* usb_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
usb_intr_schedule_adjust(struct usb_device *udev, int16_t len, uint8_t slot)
{
struct usb_bus *bus = udev->bus;
struct usb_hub *hub;
enum usb_dev_speed speed;
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);
}
hub->uframe_usage[slot] += len;
bus->uframe_usage[slot] += 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);
}
bus->uframe_usage[slot] += len;
break;
}
return (slot);
}
/*------------------------------------------------------------------------*
* usbd_fs_isoc_schedule_init_sub
*
* This function initialises an USB FULL speed isochronous schedule
* entry.
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
static void
usbd_fs_isoc_schedule_init_sub(struct usb_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;
}
#endif
/*------------------------------------------------------------------------*
* usbd_fs_isoc_schedule_init_all
*
* This function will reset the complete USB FULL speed isochronous
* bandwidth schedule.
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
void
usbd_fs_isoc_schedule_init_all(struct usb_fs_isoc_schedule *fss)
{
struct usb_fs_isoc_schedule *fss_end = fss + USB_ISOC_TIME_MAX;
while (fss != fss_end) {
usbd_fs_isoc_schedule_init_sub(fss);
fss++;
}
}
#endif
/*------------------------------------------------------------------------*
* 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_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".
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
uint16_t
usbd_fs_isoc_schedule_isoc_time_expand(struct usb_device *udev,
struct usb_fs_isoc_schedule **pp_start,
struct usb_fs_isoc_schedule **pp_end,
uint16_t isoc_time)
{
struct usb_fs_isoc_schedule *fss_end;
struct usb_fs_isoc_schedule *fss_a;
struct usb_fs_isoc_schedule *fss_b;
struct usb_hub *hs_hub;
isoc_time = usb_isoc_time_expand(udev->bus, isoc_time);
hs_hub = udev->parent_hs_hub->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;
}
usbd_fs_isoc_schedule_init_sub(fss_a);
fss_a++;
}
} else {
*pp_start = NULL;
*pp_end = NULL;
}
return (isoc_time);
}
#endif
/*------------------------------------------------------------------------*
* usbd_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
*------------------------------------------------------------------------*/
#if USB_HAVE_TT_SUPPORT
uint8_t
usbd_fs_isoc_schedule_alloc(struct usb_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 */
}
#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(&bus->explore_proc,
&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 (udev->flags.self_suspended)
needs_explore =
(udev->pwr_save.write_refs != 0) ||
((udev->pwr_save.read_refs != 0) &&
(usb_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");
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_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;
uint8_t rem_wakeup;
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;
rem_wakeup = usb_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->flags.self_suspended != 0) {
USB_BUS_UNLOCK(bus);
usb_dev_resume_peer(udev);
USB_BUS_LOCK(bus);
}
} else if (temp >= limit) {
/* check if we are not suspended */
if (udev->flags.self_suspended == 0) {
USB_BUS_UNLOCK(bus);
usb_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->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 >= (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);
/* 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;
}
/* 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_enum_lock(udev);
/* notify all sub-devices about resume */
err = usb_suspend_resume(udev, 0);
usbd_enum_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));
}
}
return;
}
/*------------------------------------------------------------------------*
* 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;
}
}
usbd_enum_lock(udev);
/* notify all sub-devices about suspend */
err = usb_suspend_resume(udev, 1);
usbd_enum_unlock(udev);
if (usb_peer_can_wakeup(udev)) {
/* 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);
/*
* 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 (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->bus);
usb_pause_mtx(NULL, USB_MS_TO_TICKS(temp));
}
/* 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;
}
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;
}
udev->power_mode = power_mode; /* update copy of power mode */
#if USB_HAVE_POWERD
usb_bus_power_update(udev->bus);
#endif
}
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