[src/trunk]: src/usr.sbin/usbdevs dynamically calculate the list of usb hubs ...

[mrg <mrg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/93048f083f59
branches:  trunk
changeset: 460977:93048f083f59
user:      mrg <mrg%NetBSD.org@localhost>
date:      Tue Nov 12 07:41:50 2019 +0000

description:
dynamically calculate the list of usb hubs from drvctl if available.

diffstat:

 usr.sbin/usbdevs/usbdevs.c |  66 +++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 62 insertions(+), 4 deletions(-)

diffs (106 lines):

diff -r 32c12db57675 -r 93048f083f59 usr.sbin/usbdevs/usbdevs.c
--- a/usr.sbin/usbdevs/usbdevs.c        Tue Nov 12 07:40:04 2019 +0000
+++ b/usr.sbin/usbdevs/usbdevs.c        Tue Nov 12 07:41:50 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: usbdevs.c,v 1.38 2019/10/24 18:18:00 kamil Exp $       */
+/*     $NetBSD: usbdevs.c,v 1.39 2019/11/12 07:41:50 mrg Exp $ */
 
 /*
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -31,13 +31,15 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: usbdevs.c,v 1.38 2019/10/24 18:18:00 kamil Exp $");
+__RCSID("$NetBSD: usbdevs.c,v 1.39 2019/11/12 07:41:50 mrg Exp $");
 #endif
 
+#include <sys/types.h>
+#include <sys/drvctlio.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <err.h>
@@ -45,6 +47,8 @@
 #include <locale.h>
 #include <langinfo.h>
 #include <iconv.h>
+#include <ctype.h>
+
 #include <dev/usb/usb.h>
 
 #define USBDEV "/dev/usb"
@@ -316,6 +320,50 @@
                usbdump(f);
 }
 
+static int
+getusbcount_device(int fd, const char *dev, int depth)
+{
+       struct devlistargs laa = {
+           .l_childname = NULL,
+           .l_children = 0,
+       };
+       size_t i;
+       size_t children;
+       int nbusses = 0;
+
+       if (depth && (dev == NULL || *dev == '\0'))
+               return 0;
+
+       /*
+        * Look for children that match "usb[0-9]*".  Could maybe
+        * simply return 1 here, but there's always a chance that
+        * someone has eg, a USB to PCI bridge, with a USB
+        * controller behind PCI.
+        */
+       if (strncmp(dev, "usb", 3) == 0 && isdigit((int)dev[3]))
+               nbusses++;
+
+       strlcpy(laa.l_devname, dev, sizeof(laa.l_devname));
+
+       if (ioctl(fd, DRVLISTDEV, &laa) == -1)
+               err(EXIT_FAILURE, "DRVLISTDEV");
+       children = laa.l_children;
+
+       laa.l_childname = malloc(children * sizeof(laa.l_childname[0]));
+       if (laa.l_childname == NULL)
+               err(EXIT_FAILURE, "out of memory");
+       if (ioctl(fd, DRVLISTDEV, &laa) == -1)
+               err(EXIT_FAILURE, "DRVLISTDEV");
+       if (laa.l_children > children)
+               err(EXIT_FAILURE, "DRVLISTDEV: number of children grew");
+
+       for (i = 0; i < laa.l_children; i++) {
+               nbusses += getusbcount_device(fd, laa.l_childname[i], depth+1);
+       }
+
+       return nbusses;
+}
+
 int
 main(int argc, char **argv)
 {
@@ -348,7 +396,17 @@
        argv += optind;
 
        if (dev == NULL) {
-               for (ncont = 0, i = 0; i < 16; i++) {
+               int nbusses;
+               int fd = open(DRVCTLDEV, O_RDONLY, 0);
+
+               /* If no drvctl configured, default to 16. */
+               if (fd != -1)
+                       nbusses = getusbcount_device(fd, "", 0);
+               else
+                       nbusses = 16;
+               close(fd);
+
+               for (ncont = 0, i = 0; i < nbusses; i++) {
                        snprintf(buf, sizeof(buf), "%s%d", USBDEV, i);
                        f = open(buf, O_RDONLY);
                        if (f >= 0) {