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NetBSD/sys/dev/usb/uhub.c

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/* $NetBSD: uhub.c,v 1.124 2013/09/15 15:33:47 martin Exp $ */
/* $FreeBSD: src/sys/dev/usb/uhub.c,v 1.18 1999/11/17 22:33:43 n_hibma Exp $ */
/*
* Copyright (c) 1998, 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (lennart@augustsson.net) at
* Carlstedt Research & Technology.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uhub.c,v 1.124 2013/09/15 15:33:47 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/bus.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdivar.h>
#ifdef UHUB_DEBUG
#define DPRINTF(x) if (uhubdebug) printf x
#define DPRINTFN(n,x) if (uhubdebug>(n)) printf x
int uhubdebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif
struct uhub_softc {
device_t sc_dev; /* base device */
usbd_device_handle sc_hub; /* USB device */
int sc_proto; /* device protocol */
usbd_pipe_handle sc_ipipe; /* interrupt pipe */
/* XXX second buffer needed because we can't suspend pipes yet */
u_int8_t *sc_statusbuf;
u_int8_t *sc_status;
size_t sc_statuslen;
int sc_explorepending;
int sc_isehciroothub; /* see comment in uhub_intr() */
u_char sc_running;
};
#define UHUB_IS_HIGH_SPEED(sc) ((sc)->sc_proto != UDPROTO_FSHUB)
#define UHUB_IS_SINGLE_TT(sc) ((sc)->sc_proto == UDPROTO_HSHUBSTT)
#define PORTSTAT_ISSET(sc, port) \
((sc)->sc_status[(port) / 8] & (1 << ((port) % 8)))
Static usbd_status uhub_explore(usbd_device_handle hub);
Static void uhub_intr(usbd_xfer_handle, usbd_private_handle,usbd_status);
/*
* We need two attachment points:
* hub to usb and hub to hub
* Every other driver only connects to hubs
*/
int uhub_match(device_t, cfdata_t, void *);
void uhub_attach(device_t, device_t, void *);
int uhub_rescan(device_t, const char *, const int *);
void uhub_childdet(device_t, device_t);
int uhub_detach(device_t, int);
extern struct cfdriver uhub_cd;
CFATTACH_DECL3_NEW(uhub, sizeof(struct uhub_softc), uhub_match,
uhub_attach, uhub_detach, NULL, uhub_rescan, uhub_childdet,
DVF_DETACH_SHUTDOWN);
CFATTACH_DECL2_NEW(uroothub, sizeof(struct uhub_softc), uhub_match,
uhub_attach, uhub_detach, NULL, uhub_rescan, uhub_childdet);
/*
* Setting this to 1 makes sure than an uhub attaches even at higher
* priority than ugen when ugen_override is set to 1. This allows to
* probe the whole USB bus and attach functions with ugen.
*/
int uhub_ubermatch = 0;
int
uhub_match(device_t parent, cfdata_t match, void *aux)
{
struct usb_attach_arg *uaa = aux;
int matchvalue;
if (uhub_ubermatch)
matchvalue = UMATCH_HIGHEST+1;
else
matchvalue = UMATCH_DEVCLASS_DEVSUBCLASS;
DPRINTFN(5,("uhub_match, uaa=%p\n", uaa));
/*
* The subclass for hubs seems to be 0 for some and 1 for others,
* so we just ignore the subclass.
*/
if (uaa->class == UDCLASS_HUB)
return (matchvalue);
return (UMATCH_NONE);
}
void
uhub_attach(device_t parent, device_t self, void *aux)
{
struct uhub_softc *sc = device_private(self);
struct usb_attach_arg *uaa = aux;
usbd_device_handle dev = uaa->device;
char *devinfop;
usbd_status err;
struct usbd_hub *hub = NULL;
usb_device_request_t req;
usb_hub_descriptor_t hubdesc;
int p, port, nports, nremov, pwrdly;
usbd_interface_handle iface;
usb_endpoint_descriptor_t *ed;
#if 0 /* notyet */
struct usbd_tt *tts = NULL;
#endif
DPRINTFN(1,("uhub_attach\n"));
sc->sc_dev = self;
sc->sc_hub = dev;
sc->sc_proto = uaa->proto;
devinfop = usbd_devinfo_alloc(dev, 1);
aprint_naive("\n");
aprint_normal(": %s\n", devinfop);
usbd_devinfo_free(devinfop);
if (dev->depth > 0 && UHUB_IS_HIGH_SPEED(sc)) {
aprint_normal_dev(self, "%s transaction translator%s\n",
UHUB_IS_SINGLE_TT(sc) ? "single" : "multiple",
UHUB_IS_SINGLE_TT(sc) ? "" : "s");
}
err = usbd_set_config_index(dev, 0, 1);
if (err) {
DPRINTF(("%s: configuration failed, error=%s\n",
device_xname(sc->sc_dev), usbd_errstr(err)));
return;
}
if (dev->depth > USB_HUB_MAX_DEPTH) {
aprint_error_dev(self,
"hub depth (%d) exceeded, hub ignored\n",
USB_HUB_MAX_DEPTH);
return;
}
/* Get hub descriptor. */
req.bmRequestType = UT_READ_CLASS_DEVICE;
req.bRequest = UR_GET_DESCRIPTOR;
USETW2(req.wValue, UDESC_HUB, 0);
USETW(req.wIndex, 0);
USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE);
DPRINTFN(1,("%s: getting hub descriptor\n", __func__));
err = usbd_do_request(dev, &req, &hubdesc);
nports = hubdesc.bNbrPorts;
if (!err && nports > 7) {
USETW(req.wLength, USB_HUB_DESCRIPTOR_SIZE + (nports+1) / 8);
err = usbd_do_request(dev, &req, &hubdesc);
}
if (err) {
DPRINTF(("%s: getting hub descriptor failed, error=%s\n",
device_xname(sc->sc_dev), usbd_errstr(err)));
return;
}
for (nremov = 0, port = 1; port <= nports; port++)
if (!UHD_NOT_REMOV(&hubdesc, port))
nremov++;
aprint_verbose_dev(self, "%d port%s with %d removable, %s powered\n",
nports, nports != 1 ? "s" : "", nremov,
dev->self_powered ? "self" : "bus");
if (nports == 0) {
aprint_debug_dev(self, "no ports, hub ignored\n");
goto bad;
}
hub = malloc(sizeof(*hub) + (nports-1) * sizeof(struct usbd_port),
M_USBDEV, M_NOWAIT);
if (hub == NULL)
return;
dev->hub = hub;
dev->hub->hubsoftc = sc;
hub->explore = uhub_explore;
hub->hubdesc = hubdesc;
/* Set up interrupt pipe. */
err = usbd_device2interface_handle(dev, 0, &iface);
if (err) {
aprint_error_dev(self, "no interface handle\n");
goto bad;
}
if (UHUB_IS_HIGH_SPEED(sc) && !UHUB_IS_SINGLE_TT(sc)) {
err = usbd_set_interface(iface, 1);
if (err)
aprint_error_dev(self, "can't enable multiple TTs\n");
}
ed = usbd_interface2endpoint_descriptor(iface, 0);
if (ed == NULL) {
aprint_error_dev(self, "no endpoint descriptor\n");
goto bad;
}
if ((ed->bmAttributes & UE_XFERTYPE) != UE_INTERRUPT) {
aprint_error_dev(self, "bad interrupt endpoint\n");
goto bad;
}
sc->sc_statuslen = (nports + 1 + 7) / 8;
sc->sc_statusbuf = malloc(sc->sc_statuslen, M_USBDEV, M_NOWAIT);
if (!sc->sc_statusbuf)
goto bad;
sc->sc_status = malloc(sc->sc_statuslen, M_USBDEV, M_NOWAIT);
if (!sc->sc_status)
goto bad;
if (device_is_a(device_parent(device_parent(sc->sc_dev)), "ehci"))
sc->sc_isehciroothub = 1;
/* force initial scan */
memset(sc->sc_status, 0xff, sc->sc_statuslen);
sc->sc_explorepending = 1;
err = usbd_open_pipe_intr(iface, ed->bEndpointAddress,
USBD_SHORT_XFER_OK|USBD_MPSAFE, &sc->sc_ipipe, sc,
sc->sc_statusbuf, sc->sc_statuslen,
uhub_intr, USBD_DEFAULT_INTERVAL);
if (err) {
aprint_error_dev(self, "cannot open interrupt pipe\n");
goto bad;
}
/* Wait with power off for a while. */
usbd_delay_ms(dev, USB_POWER_DOWN_TIME);
usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, dev, sc->sc_dev);
/*
* To have the best chance of success we do things in the exact same
* order as Windows 98. 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
*/
#if 0
if (UHUB_IS_HIGH_SPEED(sc) && nports > 0) {
tts = malloc((UHUB_IS_SINGLE_TT(sc) ? 1 : nports) *
sizeof (struct usbd_tt), M_USBDEV, M_NOWAIT);
if (!tts)
goto bad;
}
#endif
/* Set up data structures */
for (p = 0; p < nports; p++) {
struct usbd_port *up = &hub->ports[p];
up->device = NULL;
up->parent = dev;
up->portno = p+1;
if (dev->self_powered)
/* Self powered hub, give ports maximum current. */
up->power = USB_MAX_POWER;
else
up->power = USB_MIN_POWER;
up->restartcnt = 0;
up->reattach = 0;
#if 0
if (UHUB_IS_HIGH_SPEED(sc)) {
up->tt = &tts[UHUB_IS_SINGLE_TT(sc) ? 0 : p];
up->tt->hub = hub;
} else {
up->tt = NULL;
}
#endif
}
/* XXX should check for none, individual, or ganged power? */
pwrdly = dev->hub->hubdesc.bPwrOn2PwrGood * UHD_PWRON_FACTOR
+ USB_EXTRA_POWER_UP_TIME;
for (port = 1; port <= nports; port++) {
/* Turn the power on. */
err = usbd_set_port_feature(dev, port, UHF_PORT_POWER);
if (err)
aprint_error_dev(self, "port %d power on failed, %s\n",
port, usbd_errstr(err));
DPRINTF(("usb_init_port: turn on port %d power\n", port));
}
/* Wait for stable power if we are not a root hub */
if (dev->powersrc->parent != NULL)
usbd_delay_ms(dev, pwrdly);
/* The usual exploration will finish the setup. */
sc->sc_running = 1;
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "couldn't establish power handler\n");
return;
bad:
if (sc->sc_status)
free(sc->sc_status, M_USBDEV);
if (sc->sc_statusbuf)
free(sc->sc_statusbuf, M_USBDEV);
if (hub)
free(hub, M_USBDEV);
dev->hub = NULL;
return;
}
usbd_status
uhub_explore(usbd_device_handle dev)
{
usb_hub_descriptor_t *hd = &dev->hub->hubdesc;
struct uhub_softc *sc = dev->hub->hubsoftc;
struct usbd_port *up;
usbd_status err;
int speed;
int port;
int change, status, reconnect;
DPRINTFN(10, ("uhub_explore dev=%p addr=%d\n", dev, dev->address));
if (!sc->sc_running)
return (USBD_NOT_STARTED);
/* Ignore hubs that are too deep. */
if (dev->depth > USB_HUB_MAX_DEPTH)
return (USBD_TOO_DEEP);
if (PORTSTAT_ISSET(sc, 0)) { /* hub status change */
usb_hub_status_t hs;
err = usbd_get_hub_status(dev, &hs);
if (err) {
DPRINTF(("%s: get hub status failed, err=%d\n",
device_xname(sc->sc_dev), err));
} else {
/* just acknowledge */
status = UGETW(hs.wHubStatus);
change = UGETW(hs.wHubChange);
if (change & UHS_LOCAL_POWER)
usbd_clear_hub_feature(dev,
UHF_C_HUB_LOCAL_POWER);
if (change & UHS_OVER_CURRENT)
usbd_clear_hub_feature(dev,
UHF_C_HUB_OVER_CURRENT);
}
}
for (port = 1; port <= hd->bNbrPorts; port++) {
up = &dev->hub->ports[port-1];
/* reattach is needed after firmware upload */
reconnect = up->reattach;
up->reattach = 0;
status = change = 0;
/* don't check if no change summary notification */
if (PORTSTAT_ISSET(sc, port) || reconnect) {
err = usbd_get_port_status(dev, port, &up->status);
if (err) {
DPRINTF(("uhub_explore: get port stat failed, "
"error=%s\n", usbd_errstr(err)));
continue;
}
status = UGETW(up->status.wPortStatus);
change = UGETW(up->status.wPortChange);
#if 0
printf("%s port %d: s/c=%x/%x\n",
device_xname(sc->sc_dev), port, status, change);
#endif
}
if (!change && !reconnect) {
/* No status change, just do recursive explore. */
if (up->device != NULL && up->device->hub != NULL)
up->device->hub->explore(up->device);
continue;
}
if (change & UPS_C_PORT_ENABLED) {
DPRINTF(("uhub_explore: C_PORT_ENABLED\n"));
usbd_clear_port_feature(dev, port, UHF_C_PORT_ENABLE);
if (change & UPS_C_CONNECT_STATUS) {
/* Ignore the port error if the device
vanished. */
} else if (status & UPS_PORT_ENABLED) {
aprint_error_dev(sc->sc_dev,
"illegal enable change, port %d\n", port);
} else {
/* Port error condition. */
if (up->restartcnt) /* no message first time */
aprint_error_dev(sc->sc_dev,
"port error, restarting port %d\n",
port);
if (up->restartcnt++ < USBD_RESTART_MAX)
goto disco;
else
aprint_error_dev(sc->sc_dev,
"port error, giving up port %d\n",
port);
}
}
/* XXX handle overcurrent and resume events! */
if (!reconnect && !(change & UPS_C_CONNECT_STATUS)) {
/* No status change, just do recursive explore. */
if (up->device != NULL && up->device->hub != NULL)
up->device->hub->explore(up->device);
continue;
}
/* We have a connect status change, handle it. */
DPRINTF(("uhub_explore: status change hub=%d port=%d\n",
dev->address, port));
usbd_clear_port_feature(dev, port, UHF_C_PORT_CONNECTION);
/*
* If there is already a device on the port the change status
* must mean that is has disconnected. Looking at the
* current connect status is not enough to figure this out
* since a new unit may have been connected before we handle
* the disconnect.
*/
disco:
if (up->device != NULL) {
/* Disconnected */
DPRINTF(("uhub_explore: device addr=%d disappeared "
"on port %d\n", up->device->address, port));
usb_disconnect_port(up, sc->sc_dev, DETACH_FORCE);
usbd_clear_port_feature(dev, port,
UHF_C_PORT_CONNECTION);
}
if (!(status & UPS_CURRENT_CONNECT_STATUS)) {
/* Nothing connected, just ignore it. */
DPRINTFN(3,("uhub_explore: port=%d !CURRENT_CONNECT"
"_STATUS\n", port));
continue;
}
/* Connected */
if (!(status & UPS_PORT_POWER))
aprint_normal_dev(sc->sc_dev,
"strange, connected port %d has no power\n", port);
/* Wait for maximum device power up time. */
usbd_delay_ms(dev, USB_PORT_POWERUP_DELAY);
/* Reset port, which implies enabling it. */
if (usbd_reset_port(dev, port, &up->status)) {
aprint_error_dev(sc->sc_dev,
"port %d reset failed\n", port);
continue;
}
/* Get port status again, it might have changed during reset */
err = usbd_get_port_status(dev, port, &up->status);
if (err) {
DPRINTF(("uhub_explore: get port status failed, "
"error=%s\n", usbd_errstr(err)));
continue;
}
status = UGETW(up->status.wPortStatus);
change = UGETW(up->status.wPortChange);
if (!(status & UPS_CURRENT_CONNECT_STATUS)) {
/* Nothing connected, just ignore it. */
#ifdef DIAGNOSTIC
aprint_debug_dev(sc->sc_dev,
"port %d, device disappeared after reset\n", port);
#endif
continue;
}
if (!(status & UPS_PORT_ENABLED)) {
/* Not allowed send/receive packet. */
#ifdef DIAGNOSTIC
printf("%s: port %d, device not enabled\n",
device_xname(sc->sc_dev), port);
#endif
continue;
}
/* Figure out device speed */
if (status & UPS_HIGH_SPEED)
speed = USB_SPEED_HIGH;
else if (status & UPS_LOW_SPEED)
speed = USB_SPEED_LOW;
else
speed = USB_SPEED_FULL;
/* Get device info and set its address. */
err = usbd_new_device(sc->sc_dev, dev->bus,
dev->depth + 1, speed, port, up);
/* XXX retry a few times? */
if (err) {
DPRINTFN(-1,("uhub_explore: usbd_new_device failed, "
"error=%s\n", usbd_errstr(err)));
/* Avoid addressing problems by disabling. */
/* usbd_reset_port(dev, port, &up->status); */
/*
* The unit refused to accept a new address, or had
* some other serious problem. Since we cannot leave
* at 0 we have to disable the port instead.
*/
aprint_error_dev(sc->sc_dev,
"device problem, disabling port %d\n", port);
usbd_clear_port_feature(dev, port, UHF_PORT_ENABLE);
} else {
/* The port set up succeeded, reset error count. */
up->restartcnt = 0;
if (up->device->hub)
up->device->hub->explore(up->device);
}
}
/* enable status change notifications again */
if (!sc->sc_isehciroothub)
memset(sc->sc_status, 0, sc->sc_statuslen);
sc->sc_explorepending = 0;
return (USBD_NORMAL_COMPLETION);
}
/*
* Called from process context when the hub is gone.
* Detach all devices on active ports.
*/
int
uhub_detach(device_t self, int flags)
{
struct uhub_softc *sc = device_private(self);
struct usbd_hub *hub = sc->sc_hub->hub;
struct usbd_port *rup;
int nports, port, rc;
DPRINTF(("uhub_detach: sc=%p flags=%d\n", sc, flags));
if (hub == NULL) /* Must be partially working */
return (0);
/* XXXSMP usb */
KERNEL_LOCK(1, curlwp);
nports = hub->hubdesc.bNbrPorts;
for(port = 0; port < nports; port++) {
rup = &hub->ports[port];
if (rup->device == NULL)
continue;
if ((rc = usb_disconnect_port(rup, self, flags)) != 0) {
/* XXXSMP usb */
KERNEL_UNLOCK_ONE(curlwp);
return rc;
}
}
pmf_device_deregister(self);
usbd_abort_pipe(sc->sc_ipipe);
usbd_close_pipe(sc->sc_ipipe);
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_hub, sc->sc_dev);
#if 0
if (hub->ports[0].tt)
free(hub->ports[0].tt, M_USBDEV);
#endif
free(hub, M_USBDEV);
sc->sc_hub->hub = NULL;
if (sc->sc_status)
free(sc->sc_status, M_USBDEV);
if (sc->sc_statusbuf)
free(sc->sc_statusbuf, M_USBDEV);
/* XXXSMP usb */
KERNEL_UNLOCK_ONE(curlwp);
return (0);
}
int
uhub_rescan(device_t self, const char *ifattr, const int *locators)
{
struct uhub_softc *sc = device_private(self);
struct usbd_hub *hub = sc->sc_hub->hub;
usbd_device_handle dev;
int port;
for (port = 0; port < hub->hubdesc.bNbrPorts; port++) {
dev = hub->ports[port].device;
if (dev == NULL)
continue;
usbd_reattach_device(sc->sc_dev, dev, port, locators);
}
return 0;
}
/* Called when a device has been detached from it */
void
uhub_childdet(device_t self, device_t child)
{
struct uhub_softc *sc = device_private(self);
usbd_device_handle devhub = sc->sc_hub;
usbd_device_handle dev;
int nports;
int port;
int i;
if (!devhub->hub)
/* should never happen; children are only created after init */
panic("hub not fully initialised, but child deleted?");
nports = devhub->hub->hubdesc.bNbrPorts;
for (port = 0; port < nports; port++) {
dev = devhub->hub->ports[port].device;
if (!dev || dev->subdevlen == 0)
continue;
for (i = 0; i < dev->subdevlen; i++) {
if (dev->subdevs[i] == child) {
dev->subdevs[i] = NULL;
dev->nifaces_claimed--;
}
}
if (dev->nifaces_claimed == 0) {
free(dev->subdevs, M_USB);
dev->subdevs = NULL;
dev->subdevlen = 0;
}
}
}
/*
* Hub interrupt.
* This an indication that some port has changed status.
* Notify the bus event handler thread that we need
* to be explored again.
*/
void
uhub_intr(usbd_xfer_handle xfer, usbd_private_handle addr, usbd_status status)
{
struct uhub_softc *sc = addr;
DPRINTFN(5,("uhub_intr: sc=%p\n", sc));
if (status == USBD_STALLED)
usbd_clear_endpoint_stall_async(sc->sc_ipipe);
else if (status == USBD_NORMAL_COMPLETION &&
!sc->sc_explorepending) {
/*
* Make sure the status is not overwritten in between.
* XXX we should suspend the pipe instead
*/
memcpy(sc->sc_status, sc->sc_statusbuf, sc->sc_statuslen);
sc->sc_explorepending = 1;
usb_needs_explore(sc->sc_hub);
}
/*
* XXX workaround for broken implementation of the interrupt
* pipe in EHCI root hub emulation which doesn't resend
* status change notifications until handled: force a rescan
* of the ports we touched in the last run
*/
if (status == USBD_NORMAL_COMPLETION && sc->sc_explorepending &&
sc->sc_isehciroothub)
usb_needs_explore(sc->sc_hub);
}
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