Adding upstream version 1:014.upstream/1%014upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 730 insertions, 0 deletions

diff --git a/lsusb-t.c b/lsusb-t.c
new file mode 100644
index 0000000..88b6553
--- /dev/null
+++ b/lsusb-t.c
@@ -0,0 +1,730 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2009 Greg Kroah-Hartman <gregkh@suse.de> */
+#include <stdint.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stddef.h>
+
+#include "list.h"
+#include "lsusb.h"
+#include "names.h"
+
+#define MY_SYSFS_FILENAME_LEN 255
+#define MY_PATH_MAX 4096
+#define MY_PARAM_MAX 64
+
+struct usbinterface {
+	struct list_head list;
+	struct usbinterface *next;
+	struct usbdevice *parent;
+	unsigned int configuration;
+	unsigned int ifnum;
+
+	unsigned int bAlternateSetting;
+	unsigned int bInterfaceClass;
+	unsigned int bInterfaceNumber;
+	unsigned int bInterfaceProtocol;
+	unsigned int bInterfaceSubClass;
+	unsigned int bNumEndpoints;
+
+	char name[MY_SYSFS_FILENAME_LEN];
+	char driver[MY_SYSFS_FILENAME_LEN];
+};
+
+struct usbdevice {
+	struct list_head list;	/* connect devices independent of the bus */
+	struct usbdevice *next;	/* next port on this hub */
+	struct usbinterface *first_interface;	/* list of interfaces */
+	struct usbdevice *first_child;	/* connect devices on this port */
+	struct usbdevice *parent;	/* hub this device is connected to */
+	unsigned int busnum;
+	unsigned int parent_portnum;
+	unsigned int portnum;
+
+	unsigned int bConfigurationValue;
+	unsigned int bDeviceClass;
+	unsigned int bDeviceProtocol;
+	unsigned int bDeviceSubClass;
+	unsigned int bMaxPacketSize0;
+	char bMaxPower[MY_PARAM_MAX];
+	unsigned int bNumConfigurations;
+	unsigned int bNumInterfaces;
+	unsigned int bcdDevice;
+	unsigned int bmAttributes;
+	unsigned int configuration;
+	unsigned int devnum;
+	unsigned int idProduct;
+	unsigned int idVendor;
+	unsigned int maxchild;
+	char manufacturer[MY_PARAM_MAX];
+	char product[MY_PARAM_MAX];
+	char serial[MY_PARAM_MAX];
+	char version[MY_PARAM_MAX];
+	char speed[MY_PARAM_MAX];	/* '1.5','12','480','5000' + '\n' */
+	unsigned int rx_lanes;
+	unsigned int tx_lanes;
+
+	char name[MY_SYSFS_FILENAME_LEN];
+	char driver[MY_SYSFS_FILENAME_LEN];
+};
+
+struct usbbusnode {
+	struct usbbusnode *next;
+	struct usbinterface *first_interface;	/* list of interfaces */
+	struct usbdevice *first_child;	/* connect children belonging to this bus */
+	unsigned int busnum;
+
+	unsigned int bDeviceClass;
+	unsigned int devnum;
+	unsigned int idProduct;
+	unsigned int idVendor;
+	unsigned int maxchild;
+	char speed[5 + 1];	/* '1.5','12','480','5000' + '\n' */
+	unsigned int rx_lanes;
+	unsigned int tx_lanes;
+
+	char name[MY_SYSFS_FILENAME_LEN];
+	char driver[MY_SYSFS_FILENAME_LEN];
+};
+
+#define SYSFS_INTu(de,tgt, name) do { tgt->name = read_sysfs_file_int(de,#name,10); } while(0)
+#define SYSFS_INTx(de,tgt, name) do { tgt->name = read_sysfs_file_int(de,#name,16); } while(0)
+#define SYSFS_STR(de,tgt, name) do { read_sysfs_file_string(de, #name, tgt->name, MY_PARAM_MAX); } while(0)
+
+LIST_HEAD(interfacelist);
+LIST_HEAD(usbdevlist);
+static struct usbbusnode *usbbuslist;
+
+static const char sys_bus_usb_devices[] = "/sys/bus/usb/devices";
+static int indent;
+
+#if 0
+static void dump_usbbusnode(struct usbbusnode *b)
+{
+	printf(" B %p:'%u': n %p fi %p fc %p driver '%s'\n", b, b->busnum, b->next, b->first_interface, b->first_child, b->driver);
+}
+
+static void dump_usbdevice(struct usbdevice *d)
+{
+	printf
+	    (" D %p:'%s': n %p fi %p fc %p bn %u ppn %u pn %u p %p bCV %u bDC %02x bDP %02x bDSC %02x bMPS %02x bMP '%s' bNC %u bNI %u bcdD %02x bmA %02x c %u dn %u idP %04x idV %04x mc %u m '%s' p '%s' s '%s' v '%s' sp '%s' driver '%s'\n",
+	     d, d->name, d->next, d->first_interface, d->first_child, d->busnum, d->parent_portnum, d->portnum, d->parent, d->bConfigurationValue, d->bDeviceClass,
+	     d->bDeviceProtocol, d->bDeviceSubClass, d->bMaxPacketSize0, d->bMaxPower, d->bNumConfigurations, d->bNumInterfaces, d->bcdDevice, d->bmAttributes,
+	     d->configuration, d->devnum, d->idProduct, d->idVendor, d->maxchild, d->manufacturer, d->product, d->serial, d->version, d->speed, d->driver);
+}
+
+static void dump_usbinterface(struct usbinterface *i)
+{
+	printf(" I %p:'%s': n %p c %u if %u bAS %u bIC %02x bIN %02x bIP %02x bISC %02x bNE %u d '%s'\n", i, i->name, i->next, i->configuration, i->ifnum,
+	       i->bAlternateSetting, i->bInterfaceClass, i->bInterfaceNumber, i->bInterfaceProtocol, i->bInterfaceSubClass, i->bNumEndpoints, i->driver);
+}
+#endif
+
+static char tmp_str[128];
+static const char *bDeviceClass_to_str(unsigned int dc)
+{
+	const char *s;
+	switch (dc) {
+	case 9:
+		s = "root_hub";
+		break;
+	default:
+		snprintf(tmp_str, 128, "'bDeviceClass 0x%02x not yet handled'", dc);;
+		s = tmp_str;
+	}
+	return s;
+}
+
+static void lanes_to_str(char *lanes, unsigned int tx, unsigned int rx) {
+	if (tx == rx) {
+		if (tx < 2) {
+			*lanes = '\0';
+			return;
+		}
+		sprintf(lanes, "/x%u", tx);
+	} else {
+		sprintf(lanes, "/Tx%u+Rx%u", tx, rx);
+	}
+}
+
+static void print_usbbusnode(struct usbbusnode *b)
+{
+	char vendor[128], product[128];
+	char lanes[32];
+
+	lanes_to_str(lanes, b->tx_lanes, b->rx_lanes);
+
+	printf("/:  Bus %02u.Port %u: Dev %u, Class=%s, Driver=%s/%up, %sM%s\n", b->busnum, 1,
+	       b->devnum, bDeviceClass_to_str(b->bDeviceClass), b->driver, b->maxchild, b->speed, lanes);
+	if (verblevel >= 1) {
+		get_vendor_string(vendor, sizeof(vendor), b->idVendor);
+		get_product_string(product, sizeof(product), b->idVendor, b->idProduct);
+		printf("    ID %04x:%04x %s %s\n", b->idVendor, b->idProduct, vendor, product);
+	}
+	if (verblevel >= 2) {
+		printf("    %s/%s  /dev/bus/usb/%03d/%03d\n", sys_bus_usb_devices, b->name, b->busnum, b->devnum);
+	}
+}
+
+static void print_usbdevice(struct usbdevice *d, struct usbinterface *i)
+{
+	char subcls[128];
+	char vendor[128], product[128];
+	char lanes[32];
+
+	lanes_to_str(lanes, d->tx_lanes, d->rx_lanes);
+	get_class_string(subcls, sizeof(subcls), i->bInterfaceClass);
+
+	if (i->bInterfaceClass == 9)
+		printf("Port %u: Dev %u, If %u, Class=%s, Driver=%s/%up, %sM%s\n", d->portnum, d->devnum, i->ifnum, subcls,
+		       i->driver, d->maxchild, d->speed, lanes);
+	else
+		printf("Port %u: Dev %u, If %u, Class=%s, Driver=%s, %sM%s\n", d->portnum, d->devnum, i->ifnum, subcls, i->driver,
+		       d->speed, lanes);
+	if (verblevel >= 1) {
+		printf(" %*s", indent, "    ");
+		get_vendor_string(vendor, sizeof(vendor), d->idVendor);
+		get_product_string(product, sizeof(product), d->idVendor, d->idProduct);
+		printf("ID %04x:%04x %s %s\n", d->idVendor, d->idProduct, vendor, product);
+	}
+	if (verblevel >= 2) {
+		printf(" %*s", indent, "    ");
+		printf("%s/%s  /dev/bus/usb/%03d/%03d\n", sys_bus_usb_devices, d->name, d->busnum, d->devnum);
+	}
+}
+
+static unsigned int read_sysfs_file_int(const char *d_name, const char *file, int base)
+{
+	char buf[12], path[MY_PATH_MAX];
+	int fd;
+	ssize_t r;
+	unsigned long ret;
+	snprintf(path, MY_PATH_MAX, "%s/%s/%s", sys_bus_usb_devices, d_name, file);
+	path[MY_PATH_MAX - 1] = '\0';
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		goto error;
+	memset(buf, 0, sizeof(buf));
+	r = read(fd, buf, sizeof(buf) - 1);
+	close(fd);
+	if (r < 0)
+		goto error;
+	buf[sizeof(buf) - 1] = '\0';
+	ret = strtoul(buf, NULL, base);
+	return (unsigned int)ret;
+
+      error:
+	perror(path);
+	return 0;
+}
+
+static void read_sysfs_file_string(const char *d_name, const char *file, char *buf, int len)
+{
+	char path[MY_PATH_MAX];
+	int fd;
+	ssize_t r;
+	fd = snprintf(path, MY_PATH_MAX, "%s/%s/%s", sys_bus_usb_devices, d_name, file);
+	if (fd < 0 || fd >= MY_PATH_MAX)
+		goto error;
+	path[fd] = '\0';
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		goto error;
+	r = read(fd, buf, len);
+	close(fd);
+	if (r > 0 && r < len) {
+		buf[r] = '\0';
+		r--;
+		while (r >= 0 && buf[r] == '\n') {
+			buf[r] = '\0';
+			r--;
+		}
+		while (r >= 0) {
+			if (buf[r] == '\n')
+				buf[r] = ' ';
+			r--;
+		}
+		return;
+	}
+      error:
+	buf[0] = '\0';
+}
+
+static void append_dev_interface(struct usbinterface *i, struct usbinterface *new)
+{
+	while (i->next) {
+		if (i == new)
+			return;
+		i = i->next;
+	}
+		if (i == new)
+			return;
+	i->next = new;
+}
+
+static void append_dev_sibling(struct usbdevice *d, struct usbdevice *new)
+{
+	while (d->next)
+		d = d->next;
+	d->next = new;
+}
+
+static void append_businterface(unsigned int busnum, struct usbinterface *new)
+{
+	struct usbbusnode *b = usbbuslist;
+	struct usbinterface *i;
+	while (b) {
+		if (b->busnum == busnum) {
+			i = b->first_interface;
+			if (i) {
+				while (i->next) {
+					if (i == new)
+						return;
+					i = i->next;
+				}
+				if (i == new)
+					return;
+				i->next = new;
+			} else
+				b->first_interface = new;
+			break;
+		}
+		b = b->next;
+	}
+}
+
+static void append_busnode(struct usbbusnode *new)
+{
+	struct usbbusnode *b = usbbuslist;
+	if (b) {
+		while (b->next)
+			b = b->next;
+		b->next = new;
+	} else
+		usbbuslist = new;
+}
+
+static void add_usb_interface(const char *d_name)
+{
+	struct usbinterface *e;
+	const char *p;
+	char *pn, driver[MY_PATH_MAX], link[MY_PATH_MAX];
+	unsigned long i;
+	int l;
+	p = strchr(d_name, ':');
+	p++;
+	i = strtoul(p, &pn, 10);
+	if (!pn || p == pn)
+		return;
+	e = malloc(sizeof(struct usbinterface));
+	if (!e)
+		return;
+	memset(e, 0, sizeof(struct usbinterface));
+	e->configuration = i;
+	p = pn + 1;
+	i = strtoul(p, &pn, 10);
+	if (!pn || p == pn)
+	{
+		free(e);
+		return;
+	}
+	e->ifnum = i;
+	if (snprintf(e->name, MY_SYSFS_FILENAME_LEN, "%s", d_name) >= MY_SYSFS_FILENAME_LEN)
+		printf("warning: '%s' truncated to '%s'\n", d_name, e->name);
+	SYSFS_INTu(d_name, e, bAlternateSetting);
+	SYSFS_INTx(d_name, e, bInterfaceClass);
+	SYSFS_INTx(d_name, e, bInterfaceNumber);
+	SYSFS_INTx(d_name, e, bInterfaceProtocol);
+	SYSFS_INTx(d_name, e, bInterfaceSubClass);
+	SYSFS_INTx(d_name, e, bNumEndpoints);
+	l = snprintf(link, MY_PATH_MAX, "%s/%s/driver", sys_bus_usb_devices, d_name);
+	if (l > 0 && l < MY_PATH_MAX) {
+		l = readlink(link, driver, MY_PATH_MAX);
+		if (l >= 0) {
+			if (l < MY_PATH_MAX - 1)
+				driver[l] = '\0';
+			else
+				driver[0] = '\0';
+			p = strrchr(driver, '/');
+			if (p)
+				snprintf(e->driver, sizeof(e->driver), "%s", p + 1);
+		}
+	} else
+		printf("Can not read driver link for '%s': %d\n", d_name, l);
+	list_add_tail(&e->list, &interfacelist);
+}
+
+static void add_usb_device(const char *d_name)
+{
+	struct usbdevice *d;
+	const char *p;
+	char *pn, driver[MY_PATH_MAX], link[MY_PATH_MAX];
+	unsigned long i;
+	int l;
+	p = d_name;
+	i = strtoul(p, &pn, 10);
+	if (!pn || p == pn)
+		return;
+	d = malloc(sizeof(struct usbdevice));
+	if (!d)
+		return;
+	memset(d, 0, sizeof(struct usbdevice));
+	d->busnum = i;
+	while (*pn) {
+		p = pn + 1;
+		i = strtoul(p, &pn, 10);
+		if (p == pn)
+			break;
+		d->parent_portnum = d->portnum;
+		d->portnum = i;
+	}
+	if (snprintf(d->name, MY_SYSFS_FILENAME_LEN, "%s", d_name) >= MY_SYSFS_FILENAME_LEN)
+		printf("warning: '%s' truncated to '%s'\n", d_name, d->name);
+	SYSFS_INTu(d_name, d, bConfigurationValue);
+	SYSFS_INTx(d_name, d, bDeviceClass);
+	SYSFS_INTx(d_name, d, bDeviceProtocol);
+	SYSFS_INTx(d_name, d, bDeviceSubClass);
+	SYSFS_INTx(d_name, d, bMaxPacketSize0);
+	SYSFS_STR(d_name, d, bMaxPower);
+	SYSFS_INTu(d_name, d, bNumConfigurations);
+	SYSFS_INTx(d_name, d, bNumInterfaces);
+	SYSFS_INTx(d_name, d, bcdDevice);
+	SYSFS_INTx(d_name, d, bmAttributes);
+	SYSFS_INTu(d_name, d, configuration);
+	SYSFS_INTu(d_name, d, devnum);
+	SYSFS_INTx(d_name, d, idProduct);
+	SYSFS_INTx(d_name, d, idVendor);
+	SYSFS_INTu(d_name, d, maxchild);
+	SYSFS_STR(d_name, d, manufacturer);
+	SYSFS_STR(d_name, d, product);
+	SYSFS_STR(d_name, d, serial);
+	SYSFS_STR(d_name, d, version);
+	SYSFS_STR(d_name, d, speed);
+	SYSFS_INTu(d_name, d, rx_lanes);
+	SYSFS_INTu(d_name, d, tx_lanes);
+	l = snprintf(link, MY_PATH_MAX, "%s/%s/driver", sys_bus_usb_devices, d_name);
+	if (l > 0 && l < MY_PATH_MAX) {
+		l = readlink(link, driver, MY_PATH_MAX);
+		if (l >= 0) {
+			if (l < MY_PATH_MAX - 1)
+				driver[l] = '\0';
+			else
+				driver[0] = '\0';
+			p = strrchr(driver, '/');
+			if (p)
+				snprintf(d->driver, sizeof(d->driver), "%s", p + 1);
+		}
+	} else
+		printf("Can not read driver link for '%s': %d\n", d_name, l);
+	list_add_tail(&d->list, &usbdevlist);
+}
+
+static void get_roothub_driver(struct usbbusnode *b, const char *d_name)
+{
+	char *p, path[MY_PATH_MAX], link[MY_PATH_MAX];
+	int l;
+	l = snprintf(link, MY_PATH_MAX, "%s/%s/../driver", sys_bus_usb_devices, d_name);
+	if (l > 0 && l < MY_PATH_MAX) {
+		l = readlink(link, path, MY_PATH_MAX);
+		if (l >= 0) {
+			if (l < MY_PATH_MAX - 1)
+				path[l] = '\0';
+			else
+				path[0] = '\0';
+			p = strrchr(path, '/');
+			if (p)
+				snprintf(b->driver, sizeof(b->driver), "%s", p + 1);
+		}
+	} else
+		printf("Can not read driver link for '%s': %d\n", d_name, l);
+}
+
+static void add_usb_bus(const char *d_name)
+{
+	struct usbbusnode *bus;
+	bus = malloc(sizeof(struct usbbusnode));
+	if (bus) {
+		memset(bus, 0, sizeof(struct usbbusnode));
+		bus->busnum = strtoul(d_name + 3, NULL, 10);
+		if (snprintf(bus->name, MY_SYSFS_FILENAME_LEN, "%s", d_name) >= MY_SYSFS_FILENAME_LEN)
+			printf("warning: '%s' truncated to '%s'\n", d_name, bus->name);
+		SYSFS_INTu(d_name, bus, devnum);
+		SYSFS_INTx(d_name, bus, bDeviceClass);
+		SYSFS_INTx(d_name, bus, idProduct);
+		SYSFS_INTx(d_name, bus, idVendor);
+		SYSFS_INTu(d_name, bus, maxchild);
+		SYSFS_STR(d_name, bus, speed);
+		SYSFS_INTu(d_name, bus, rx_lanes);
+		SYSFS_INTu(d_name, bus, tx_lanes);
+		append_busnode(bus);
+		get_roothub_driver(bus, d_name);
+	}
+}
+
+static void inspect_bus_entry(const char *d_name)
+{
+	if (d_name[0] == '.' && (!d_name[1] || (d_name[1] == '.' && !d_name[2])))
+		return;
+	if (d_name[0] == 'u' && d_name[1] == 's' && d_name[2] == 'b' && isdigit(d_name[3])) {
+		add_usb_bus(d_name);
+	} else if (isdigit(d_name[0])) {
+		if (strchr(d_name, ':'))
+			add_usb_interface(d_name);
+		else
+			add_usb_device(d_name);
+	} else
+		fprintf(stderr, "ignoring '%s'\n", d_name);
+}
+
+static void walk_usb_devices(DIR * sbud)
+{
+	struct dirent *de;
+	while ((de = readdir(sbud)))
+		inspect_bus_entry(de->d_name);
+}
+
+static void assign_dev_to_bus(struct usbdevice *d)
+{
+	struct usbbusnode *b = usbbuslist;
+	while (b) {
+		if (b->busnum == d->busnum) {
+			if (b->first_child)
+				append_dev_sibling(b->first_child, d);
+			else
+				b->first_child = d;
+		}
+		b = b->next;
+	}
+}
+
+static void assign_dev_to_parent(struct usbdevice *d)
+{
+	struct list_head *l;
+	struct usbdevice *pd;
+	char n[MY_SYSFS_FILENAME_LEN], *p;
+	for (l = usbdevlist.next; l != &usbdevlist; l = l->next) {
+		pd = list_entry(l, struct usbdevice, list);
+		if (pd == d)
+			continue;
+		if (pd->busnum == d->busnum && pd->portnum == d->parent_portnum) {
+			strcpy(n, d->name);
+			p = strrchr(n, '.');
+			if (p) {
+				*p = '\0';
+				if (strcmp(n, pd->name)) {
+					continue;
+				}
+				d->parent = pd;
+				if (pd->first_child)
+					append_dev_sibling(pd->first_child, d);
+				else
+					pd->first_child = d;
+				break;
+			}
+		}
+	}
+}
+
+static void assign_interface_to_parent(struct usbdevice *d, struct usbinterface *i)
+{
+	const char *p;
+	char *pn, name[MY_SYSFS_FILENAME_LEN];
+	ptrdiff_t l;
+	unsigned int busnum;
+
+	p = strchr(i->name, ':');
+	if (p) {
+		l = p - i->name;
+		if (l < MY_SYSFS_FILENAME_LEN) {
+			memcpy(name, i->name, l);
+			name[l] = '\0';
+		} else
+			name[0] = '\0';
+		if (strcmp(d->name, name) == 0) {
+			i->parent = d;
+			if (d->first_interface)
+				append_dev_interface(d->first_interface, i);
+			else
+				d->first_interface = i;
+		} else {
+			busnum = strtoul(name, &pn, 10);
+			if (pn && pn != name) {
+				if (p[1] == '0')
+					append_businterface(busnum, i);
+			}
+		}
+	}
+}
+
+static void connect_devices(void)
+{
+	struct list_head *ld, *li;
+	struct usbdevice *d;
+	struct usbinterface *e;
+	for (ld = usbdevlist.next; ld != &usbdevlist; ld = ld->next) {
+		d = list_entry(ld, struct usbdevice, list);
+		if (d->parent_portnum)
+			assign_dev_to_parent(d);
+		else
+			assign_dev_to_bus(d);
+		for (li = interfacelist.next; li != &interfacelist; li = li->next) {
+			e = list_entry(li, struct usbinterface, list);
+			if (!e->parent)
+				assign_interface_to_parent(d, e);
+		}
+	}
+	for (li = interfacelist.next; li != &interfacelist; li = li->next) {
+		e = list_entry(li, struct usbinterface, list);
+	}
+}
+
+static void sort_dev_interfaces(struct usbinterface **i)
+{
+	struct usbinterface *t, *p, **pp;
+	int swapped;
+	p = *i;
+	pp = i;
+	do {
+		p = *i;
+		pp = i;
+		swapped = 0;
+		while (p->next) {
+			if (p->configuration > p->next->configuration) {
+				t = p->next;
+				p->next = t->next;
+				t->next = p;
+				*pp = t;
+				swapped = 1;
+				p = t;
+			}
+			if (p->ifnum > p->next->ifnum) {
+				t = p->next;
+				p->next = t->next;
+				t->next = p;
+				*pp = t;
+				swapped = 1;
+				p = t;
+			}
+			pp = &p->next;
+			p = p->next;
+		}
+	} while (swapped);
+}
+
+static void sort_dev_siblings(struct usbdevice **d)
+{
+	struct usbdevice *t, *p, **pp;
+	int swapped;
+	p = *d;
+	pp = d;
+	if (p->first_child)
+		sort_dev_siblings(&p->first_child);
+	if (p->first_interface)
+		sort_dev_interfaces(&p->first_interface);
+	do {
+		p = *d;
+		pp = d;
+		swapped = 0;
+		while (p->next) {
+			if (p->portnum > p->next->portnum) {
+				t = p->next;
+				p->next = t->next;
+				t->next = p;
+				*pp = t;
+				swapped = 1;
+				p = t;
+			}
+			pp = &p->next;
+			p = p->next;
+		}
+	} while (swapped);
+}
+
+static void sort_devices(void)
+{
+	struct usbbusnode *b = usbbuslist;
+	while (b) {
+		if (b->first_child)
+			sort_dev_siblings(&b->first_child);
+		b = b->next;
+	}
+}
+
+static void sort_busses(void)
+{
+	/* need to reverse sort bus numbers */
+	struct usbbusnode *t, *p, **pp;
+	int swapped;
+	do {
+		p = usbbuslist;
+		if (p == NULL)
+			return;
+		pp = &usbbuslist;
+		swapped = 0;
+		while (p && p->next) {
+			if (p->busnum < p->next->busnum) {
+				t = p->next;
+				p->next = t->next;
+				t->next = p;
+				*pp = t;
+				swapped = 1;
+				p = t;
+			}
+			pp = &p->next;
+			p = p->next;
+		}
+	} while (swapped);
+}
+
+static void print_tree_dev_interface(struct usbdevice *d, struct usbinterface *i)
+{
+	indent += 3;
+	while (i) {
+		printf(" %*s", indent, "|__ ");
+		print_usbdevice(d, i);
+		i = i->next;
+	}
+	indent -= 3;
+}
+static void print_tree_dev_children(struct usbdevice *d)
+{
+	indent += 4;
+	while (d) {
+		print_tree_dev_interface(d, d->first_interface);
+		print_tree_dev_children(d->first_child);
+		d = d->next;
+	}
+	indent -= 4;
+}
+
+static void print_tree(void)
+{
+	struct usbbusnode *b = usbbuslist;
+	while (b) {
+		print_usbbusnode(b);
+		if (b->first_child)
+			print_tree_dev_children(b->first_child);
+		b = b->next;
+	}
+}
+
+int lsusb_t(void)
+{
+	DIR *sbud = opendir(sys_bus_usb_devices);
+	if (sbud) {
+		walk_usb_devices(sbud);
+		closedir(sbud);
+		connect_devices();
+		sort_devices();
+		sort_busses();
+		print_tree();
+	} else
+		perror(sys_bus_usb_devices);
+	return sbud == NULL;
+}