2 * Most of this source has been derived from the Linux USB
4 * (C) Copyright Linus Torvalds 1999
5 * (C) Copyright Johannes Erdfelt 1999-2001
6 * (C) Copyright Andreas Gal 1999
7 * (C) Copyright Gregory P. Smith 1999
8 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
9 * (C) Copyright Randy Dunlap 2000
10 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
11 * (C) Copyright Yggdrasil Computing, Inc. 2000
12 * (usb_device_id matching changes by Adam J. Richter)
15 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
17 * SPDX-License-Identifier: GPL-2.0+
20 /****************************************************************************
22 * Probes device for being a hub and configurate it
30 #include <asm/processor.h>
31 #include <asm/unaligned.h>
32 #include <linux/ctype.h>
33 #include <linux/list.h>
34 #include <asm/byteorder.h>
36 #include <asm/state.h>
38 #include <asm/unaligned.h>
40 DECLARE_GLOBAL_DATA_PTR
;
44 #include <asm/4xx_pci.h>
47 #define USB_BUFSIZ 512
49 #define HUB_SHORT_RESET_TIME 20
50 #define HUB_LONG_RESET_TIME 200
52 #define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
54 struct usb_device_scan
{
55 struct usb_device
*dev
; /* USB hub device to scan */
56 struct usb_hub_device
*hub
; /* USB hub struct */
57 int port
; /* USB port to scan */
58 struct list_head list
;
61 /* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
62 static struct usb_hub_device hub_dev
[USB_MAX_HUB
];
63 static int usb_hub_index
;
64 static LIST_HEAD(usb_scan_list
);
66 __weak
void usb_hub_reset_devices(int port
)
71 static int usb_get_hub_descriptor(struct usb_device
*dev
, void *data
, int size
)
73 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
74 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
75 USB_DT_HUB
<< 8, 0, data
, size
, USB_CNTL_TIMEOUT
);
78 static int usb_clear_port_feature(struct usb_device
*dev
, int port
, int feature
)
80 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
81 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
,
82 port
, NULL
, 0, USB_CNTL_TIMEOUT
);
85 static int usb_set_port_feature(struct usb_device
*dev
, int port
, int feature
)
87 return usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0),
88 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
,
89 port
, NULL
, 0, USB_CNTL_TIMEOUT
);
92 static int usb_get_hub_status(struct usb_device
*dev
, void *data
)
94 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
95 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
96 data
, sizeof(struct usb_hub_status
), USB_CNTL_TIMEOUT
);
99 int usb_get_port_status(struct usb_device
*dev
, int port
, void *data
)
101 return usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0),
102 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port
,
103 data
, sizeof(struct usb_hub_status
), USB_CNTL_TIMEOUT
);
107 static void usb_hub_power_on(struct usb_hub_device
*hub
)
110 struct usb_device
*dev
;
111 unsigned pgood_delay
= hub
->desc
.bPwrOn2PwrGood
* 2;
116 debug("enabling power on all ports\n");
117 for (i
= 0; i
< dev
->maxchild
; i
++) {
118 usb_set_port_feature(dev
, i
+ 1, USB_PORT_FEAT_POWER
);
119 debug("port %d returns %lX\n", i
+ 1, dev
->status
);
122 #ifdef CONFIG_SANDBOX
124 * Don't set timeout / delay values here. This results
125 * in these values still being reset to 0.
127 if (state_get_skip_delays())
132 * Wait for power to become stable,
133 * plus spec-defined max time for device to connect
134 * but allow this time to be increased via env variable as some
135 * devices break the spec and require longer warm-up times
137 env
= getenv("usb_pgood_delay");
139 pgood_delay
= max(pgood_delay
,
140 (unsigned)simple_strtol(env
, NULL
, 0));
141 debug("pgood_delay=%dms\n", pgood_delay
);
144 * Do a minimum delay of the larger value of 100ms or pgood_delay
145 * so that the power can stablize before the devices are queried
147 hub
->query_delay
= get_timer(0) + max(100, (int)pgood_delay
);
150 * Record the power-on timeout here. The max. delay (timeout)
151 * will be done based on this value in the USB port loop in
152 * usb_hub_configure() later.
154 hub
->connect_timeout
= hub
->query_delay
+ 1000;
155 debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
156 dev
->devnum
, max(100, (int)pgood_delay
),
157 max(100, (int)pgood_delay
) + 1000);
160 void usb_hub_reset(void)
164 /* Zero out global hub_dev in case its re-used again */
165 memset(hub_dev
, 0, sizeof(hub_dev
));
168 static struct usb_hub_device
*usb_hub_allocate(void)
170 if (usb_hub_index
< USB_MAX_HUB
)
171 return &hub_dev
[usb_hub_index
++];
173 printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB
);
179 static inline char *portspeed(int portstatus
)
183 switch (portstatus
& USB_PORT_STAT_SPEED_MASK
) {
184 case USB_PORT_STAT_SUPER_SPEED
:
185 speed_str
= "5 Gb/s";
187 case USB_PORT_STAT_HIGH_SPEED
:
188 speed_str
= "480 Mb/s";
190 case USB_PORT_STAT_LOW_SPEED
:
191 speed_str
= "1.5 Mb/s";
194 speed_str
= "12 Mb/s";
201 int legacy_hub_port_reset(struct usb_device
*dev
, int port
,
202 unsigned short *portstat
)
205 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
206 unsigned short portstatus
, portchange
;
207 int delay
= HUB_SHORT_RESET_TIME
; /* start with short reset delay */
210 debug("%s: resetting '%s' port %d...\n", __func__
, dev
->dev
->name
,
213 debug("%s: resetting port %d...\n", __func__
, port
+ 1);
215 for (tries
= 0; tries
< MAX_TRIES
; tries
++) {
216 err
= usb_set_port_feature(dev
, port
+ 1, USB_PORT_FEAT_RESET
);
222 if (usb_get_port_status(dev
, port
+ 1, portsts
) < 0) {
223 debug("get_port_status failed status %lX\n",
227 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
228 portchange
= le16_to_cpu(portsts
->wPortChange
);
230 debug("portstatus %x, change %x, %s\n", portstatus
, portchange
,
231 portspeed(portstatus
));
233 debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
234 " USB_PORT_STAT_ENABLE %d\n",
235 (portchange
& USB_PORT_STAT_C_CONNECTION
) ? 1 : 0,
236 (portstatus
& USB_PORT_STAT_CONNECTION
) ? 1 : 0,
237 (portstatus
& USB_PORT_STAT_ENABLE
) ? 1 : 0);
240 * Perhaps we should check for the following here:
241 * - C_CONNECTION hasn't been set.
242 * - CONNECTION is still set.
244 * Doing so would ensure that the device is still connected
245 * to the bus, and hasn't been unplugged or replaced while the
246 * USB bus reset was going on.
248 * However, if we do that, then (at least) a San Disk Ultra
249 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
250 * Tegra Jetson TK1 board. For some reason, the device appears
251 * to briefly drop off the bus when this second bus reset is
252 * executed, yet if we retry this loop, it'll eventually come
253 * back after another reset or two.
256 if (portstatus
& USB_PORT_STAT_ENABLE
)
259 /* Switch to long reset delay for the next round */
260 delay
= HUB_LONG_RESET_TIME
;
263 if (tries
== MAX_TRIES
) {
264 debug("Cannot enable port %i after %i retries, " \
265 "disabling port.\n", port
+ 1, MAX_TRIES
);
266 debug("Maybe the USB cable is bad?\n");
270 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_C_RESET
);
271 *portstat
= portstatus
;
276 int hub_port_reset(struct udevice
*dev
, int port
, unsigned short *portstat
)
278 struct usb_device
*udev
= dev_get_parent_priv(dev
);
280 return legacy_hub_port_reset(udev
, port
, portstat
);
284 int usb_hub_port_connect_change(struct usb_device
*dev
, int port
)
286 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
287 unsigned short portstatus
;
291 ret
= usb_get_port_status(dev
, port
+ 1, portsts
);
293 debug("get_port_status failed\n");
297 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
298 debug("portstatus %x, change %x, %s\n",
300 le16_to_cpu(portsts
->wPortChange
),
301 portspeed(portstatus
));
303 /* Clear the connection change status */
304 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_C_CONNECTION
);
306 /* Disconnect any existing devices under this port */
307 if (((!(portstatus
& USB_PORT_STAT_CONNECTION
)) &&
308 (!(portstatus
& USB_PORT_STAT_ENABLE
))) ||
309 usb_device_has_child_on_port(dev
, port
)) {
310 debug("usb_disconnect(&hub->children[port]);\n");
311 /* Return now if nothing is connected */
312 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
317 ret
= legacy_hub_port_reset(dev
, port
, &portstatus
);
320 printf("cannot reset port %i!?\n", port
+ 1);
324 switch (portstatus
& USB_PORT_STAT_SPEED_MASK
) {
325 case USB_PORT_STAT_SUPER_SPEED
:
326 speed
= USB_SPEED_SUPER
;
328 case USB_PORT_STAT_HIGH_SPEED
:
329 speed
= USB_SPEED_HIGH
;
331 case USB_PORT_STAT_LOW_SPEED
:
332 speed
= USB_SPEED_LOW
;
335 speed
= USB_SPEED_FULL
;
340 struct udevice
*child
;
342 ret
= usb_scan_device(dev
->dev
, port
+ 1, speed
, &child
);
344 struct usb_device
*usb
;
346 ret
= usb_alloc_new_device(dev
->controller
, &usb
);
348 printf("cannot create new device: ret=%d", ret
);
352 dev
->children
[port
] = usb
;
355 usb
->portnr
= port
+ 1;
356 /* Run it through the hoops (find a driver, etc) */
357 ret
= usb_new_device(usb
);
359 /* Woops, disable the port */
360 usb_free_device(dev
->controller
);
361 dev
->children
[port
] = NULL
;
365 debug("hub: disabling port %d\n", port
+ 1);
366 usb_clear_port_feature(dev
, port
+ 1, USB_PORT_FEAT_ENABLE
);
372 static int usb_scan_port(struct usb_device_scan
*usb_scan
)
374 ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status
, portsts
, 1);
375 unsigned short portstatus
;
376 unsigned short portchange
;
377 struct usb_device
*dev
;
378 struct usb_hub_device
*hub
;
387 * Don't talk to the device before the query delay is expired.
388 * This is needed for voltages to stabalize.
390 if (get_timer(0) < hub
->query_delay
)
393 ret
= usb_get_port_status(dev
, i
+ 1, portsts
);
395 debug("get_port_status failed\n");
396 if (get_timer(0) >= hub
->connect_timeout
) {
397 debug("devnum=%d port=%d: timeout\n",
399 /* Remove this device from scanning list */
400 list_del(&usb_scan
->list
);
407 portstatus
= le16_to_cpu(portsts
->wPortStatus
);
408 portchange
= le16_to_cpu(portsts
->wPortChange
);
409 debug("Port %d Status %X Change %X\n", i
+ 1, portstatus
, portchange
);
411 /* No connection change happened, wait a bit more. */
412 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
)) {
413 if (get_timer(0) >= hub
->connect_timeout
) {
414 debug("devnum=%d port=%d: timeout\n",
416 /* Remove this device from scanning list */
417 list_del(&usb_scan
->list
);
424 /* Test if the connection came up, and if not exit */
425 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
428 /* A new USB device is ready at this point */
429 debug("devnum=%d port=%d: USB dev found\n", dev
->devnum
, i
+ 1);
431 usb_hub_port_connect_change(dev
, i
);
433 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
434 debug("port %d enable change, status %x\n", i
+ 1, portstatus
);
435 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_C_ENABLE
);
437 * The following hack causes a ghost device problem
440 #ifndef CONFIG_USB_EHCI_FARADAY
442 * EM interference sometimes causes bad shielded USB
443 * devices to be shutdown by the hub, this hack enables
444 * them again. Works at least with mouse driver
446 if (!(portstatus
& USB_PORT_STAT_ENABLE
) &&
447 (portstatus
& USB_PORT_STAT_CONNECTION
) &&
448 usb_device_has_child_on_port(dev
, i
)) {
449 debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
451 usb_hub_port_connect_change(dev
, i
);
456 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
457 debug("port %d suspend change\n", i
+ 1);
458 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_SUSPEND
);
461 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
462 debug("port %d over-current change\n", i
+ 1);
463 usb_clear_port_feature(dev
, i
+ 1,
464 USB_PORT_FEAT_C_OVER_CURRENT
);
465 /* Only power-on this one port */
466 usb_set_port_feature(dev
, i
+ 1, USB_PORT_FEAT_POWER
);
467 hub
->overcurrent_count
[i
]++;
470 * If the max-scan-count is not reached, return without removing
471 * the device from scan-list. This will re-issue a new scan.
473 if (hub
->overcurrent_count
[i
] <=
474 PORT_OVERCURRENT_MAX_SCAN_COUNT
)
477 /* Otherwise the device will get removed */
478 printf("Port %d over-current occurred %d times\n", i
+ 1,
479 hub
->overcurrent_count
[i
]);
482 if (portchange
& USB_PORT_STAT_C_RESET
) {
483 debug("port %d reset change\n", i
+ 1);
484 usb_clear_port_feature(dev
, i
+ 1, USB_PORT_FEAT_C_RESET
);
488 * We're done with this device, so let's remove this device from
491 list_del(&usb_scan
->list
);
497 static int usb_device_list_scan(void)
499 struct usb_device_scan
*usb_scan
;
500 struct usb_device_scan
*tmp
;
504 /* Only run this loop once for each controller */
511 /* We're done, once the list is empty again */
512 if (list_empty(&usb_scan_list
))
515 list_for_each_entry_safe(usb_scan
, tmp
, &usb_scan_list
, list
) {
519 ret
= usb_scan_port(usb_scan
);
527 * This USB controller has finished scanning all its connected
528 * USB devices. Set "running" back to 0, so that other USB controllers
529 * will scan their devices too.
536 static int usb_hub_configure(struct usb_device
*dev
)
539 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer
, USB_BUFSIZ
);
540 unsigned char *bitmap
;
541 short hubCharacteristics
;
542 struct usb_hub_descriptor
*descriptor
;
543 struct usb_hub_device
*hub
;
544 __maybe_unused
struct usb_hub_status
*hubsts
;
547 /* "allocate" Hub device */
548 hub
= usb_hub_allocate();
552 /* Get the the hub descriptor */
553 ret
= usb_get_hub_descriptor(dev
, buffer
, 4);
555 debug("usb_hub_configure: failed to get hub " \
556 "descriptor, giving up %lX\n", dev
->status
);
559 descriptor
= (struct usb_hub_descriptor
*)buffer
;
561 length
= min_t(int, descriptor
->bLength
,
562 sizeof(struct usb_hub_descriptor
));
564 ret
= usb_get_hub_descriptor(dev
, buffer
, length
);
566 debug("usb_hub_configure: failed to get hub " \
567 "descriptor 2nd giving up %lX\n", dev
->status
);
570 memcpy((unsigned char *)&hub
->desc
, buffer
, length
);
571 /* adjust 16bit values */
572 put_unaligned(le16_to_cpu(get_unaligned(
573 &descriptor
->wHubCharacteristics
)),
574 &hub
->desc
.wHubCharacteristics
);
576 bitmap
= (unsigned char *)&hub
->desc
.DeviceRemovable
[0];
577 /* devices not removable by default */
578 memset(bitmap
, 0xff, (USB_MAXCHILDREN
+1+7)/8);
579 bitmap
= (unsigned char *)&hub
->desc
.PortPowerCtrlMask
[0];
580 memset(bitmap
, 0xff, (USB_MAXCHILDREN
+1+7)/8); /* PowerMask = 1B */
582 for (i
= 0; i
< ((hub
->desc
.bNbrPorts
+ 1 + 7)/8); i
++)
583 hub
->desc
.DeviceRemovable
[i
] = descriptor
->DeviceRemovable
[i
];
585 for (i
= 0; i
< ((hub
->desc
.bNbrPorts
+ 1 + 7)/8); i
++)
586 hub
->desc
.PortPowerCtrlMask
[i
] = descriptor
->PortPowerCtrlMask
[i
];
588 dev
->maxchild
= descriptor
->bNbrPorts
;
589 debug("%d ports detected\n", dev
->maxchild
);
591 hubCharacteristics
= get_unaligned(&hub
->desc
.wHubCharacteristics
);
592 switch (hubCharacteristics
& HUB_CHAR_LPSM
) {
594 debug("ganged power switching\n");
597 debug("individual port power switching\n");
601 debug("unknown reserved power switching mode\n");
605 if (hubCharacteristics
& HUB_CHAR_COMPOUND
)
606 debug("part of a compound device\n");
608 debug("standalone hub\n");
610 switch (hubCharacteristics
& HUB_CHAR_OCPM
) {
612 debug("global over-current protection\n");
615 debug("individual port over-current protection\n");
619 debug("no over-current protection\n");
623 debug("power on to power good time: %dms\n",
624 descriptor
->bPwrOn2PwrGood
* 2);
625 debug("hub controller current requirement: %dmA\n",
626 descriptor
->bHubContrCurrent
);
628 for (i
= 0; i
< dev
->maxchild
; i
++)
629 debug("port %d is%s removable\n", i
+ 1,
630 hub
->desc
.DeviceRemovable
[(i
+ 1) / 8] & \
631 (1 << ((i
+ 1) % 8)) ? " not" : "");
633 if (sizeof(struct usb_hub_status
) > USB_BUFSIZ
) {
634 debug("usb_hub_configure: failed to get Status - " \
635 "too long: %d\n", descriptor
->bLength
);
639 ret
= usb_get_hub_status(dev
, buffer
);
641 debug("usb_hub_configure: failed to get Status %lX\n",
647 hubsts
= (struct usb_hub_status
*)buffer
;
650 debug("get_hub_status returned status %X, change %X\n",
651 le16_to_cpu(hubsts
->wHubStatus
),
652 le16_to_cpu(hubsts
->wHubChange
));
653 debug("local power source is %s\n",
654 (le16_to_cpu(hubsts
->wHubStatus
) & HUB_STATUS_LOCAL_POWER
) ? \
655 "lost (inactive)" : "good");
656 debug("%sover-current condition exists\n",
657 (le16_to_cpu(hubsts
->wHubStatus
) & HUB_STATUS_OVERCURRENT
) ? \
659 usb_hub_power_on(hub
);
662 * Reset any devices that may be in a bad state when applying
663 * the power. This is a __weak function. Resetting of the devices
664 * should occur in the board file of the device.
666 for (i
= 0; i
< dev
->maxchild
; i
++)
667 usb_hub_reset_devices(i
+ 1);
670 * Only add the connected USB devices, including potential hubs,
671 * to a scanning list. This list will get scanned and devices that
672 * are detected (either via port connected or via port timeout)
673 * will get removed from this list. Scanning of the devices on this
674 * list will continue until all devices are removed.
676 for (i
= 0; i
< dev
->maxchild
; i
++) {
677 struct usb_device_scan
*usb_scan
;
679 usb_scan
= calloc(1, sizeof(*usb_scan
));
681 printf("Can't allocate memory for USB device!\n");
687 list_add_tail(&usb_scan
->list
, &usb_scan_list
);
691 * And now call the scanning code which loops over the generated list
693 ret
= usb_device_list_scan();
698 static int usb_hub_check(struct usb_device
*dev
, int ifnum
)
700 struct usb_interface
*iface
;
701 struct usb_endpoint_descriptor
*ep
= NULL
;
703 iface
= &dev
->config
.if_desc
[ifnum
];
705 if (iface
->desc
.bInterfaceClass
!= USB_CLASS_HUB
)
707 /* Some hubs have a subclass of 1, which AFAICT according to the */
708 /* specs is not defined, but it works */
709 if ((iface
->desc
.bInterfaceSubClass
!= 0) &&
710 (iface
->desc
.bInterfaceSubClass
!= 1))
712 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
713 if (iface
->desc
.bNumEndpoints
!= 1)
715 ep
= &iface
->ep_desc
[0];
716 /* Output endpoint? Curiousier and curiousier.. */
717 if (!(ep
->bEndpointAddress
& USB_DIR_IN
))
719 /* If it's not an interrupt endpoint, we'd better punt! */
720 if ((ep
->bmAttributes
& 3) != 3)
723 debug("USB hub found\n");
727 debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
728 iface
->desc
.bInterfaceClass
, iface
->desc
.bInterfaceSubClass
,
729 iface
->desc
.bNumEndpoints
);
731 debug(" bEndpointAddress=%#x, bmAttributes=%d",
732 ep
->bEndpointAddress
, ep
->bmAttributes
);
738 int usb_hub_probe(struct usb_device
*dev
, int ifnum
)
742 ret
= usb_hub_check(dev
, ifnum
);
745 ret
= usb_hub_configure(dev
);
750 int usb_hub_scan(struct udevice
*hub
)
752 struct usb_device
*udev
= dev_get_parent_priv(hub
);
754 return usb_hub_configure(udev
);
757 static int usb_hub_post_probe(struct udevice
*dev
)
759 debug("%s\n", __func__
);
760 return usb_hub_scan(dev
);
763 static const struct udevice_id usb_hub_ids
[] = {
764 { .compatible
= "usb-hub" },
768 U_BOOT_DRIVER(usb_generic_hub
) = {
770 .id
= UCLASS_USB_HUB
,
771 .of_match
= usb_hub_ids
,
772 .flags
= DM_FLAG_ALLOC_PRIV_DMA
,
775 UCLASS_DRIVER(usb_hub
) = {
776 .id
= UCLASS_USB_HUB
,
778 .post_bind
= dm_scan_fdt_dev
,
779 .post_probe
= usb_hub_post_probe
,
780 .child_pre_probe
= usb_child_pre_probe
,
781 .per_child_auto_alloc_size
= sizeof(struct usb_device
),
782 .per_child_platdata_auto_alloc_size
= sizeof(struct usb_dev_platdata
),
785 static const struct usb_device_id hub_id_table
[] = {
787 .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
788 .bDeviceClass
= USB_CLASS_HUB
790 { } /* Terminating entry */
793 U_BOOT_USB_DEVICE(usb_generic_hub
, hub_id_table
);