Greetings,
I'm interested in controlling the port power on my USB hub based on
the serial number of the device plugged into the respective port.
I've read the archives and purchased a hub with the appropriate port
power control circuitry (namely the Targus, Inc.'s PAUH212) . Using
the source available from http://www.gniibe.org/log/2006/01/14 I have
been to successfully turn the port power on and off.
I've experimented a bit and have been able to identify the bus number
and device number of the hub to which the device I'm interesting in
powering on/off is connected. What I've not been able to figure out,
however, is the number of the port to which the device is connected.
One alternative I have been able to find is that instead of searching
for the hub's bus/device information, I can search for the device's
bus/device information, use that information to find an entry in
/proc/bus/usb/devices (which lists both the parent device number and
port), then carry on from there. However, I'd really rather stay away
from parsing out that information.
I've attached a copy of the code I've been working with so far. Any
suggestions you might have would be greatly appreciated.
Thanks in advance.
Andy
/*
* Copyright (C) 2006 Free Software Initiative of Japan
*
* Author: NIIBE Yutaka <gniibe at fsij.org>
* Modified by: Andrew R. Dalton <andy.dalton at gmail.com>
*
* This file can be distributed under the terms and conditions of the
* GNU General Public License version 2 (or later).
*
*/
#include <usb.h>
#include <stdio.h>
#define SERIAL_MAX_LEN 128
static void usage(const char* progname) {
fprintf(stderr, "Usage: %s -s <SERIAL>\n", progname);
}
int main(int argc, const char* argv[]) {
char serial[SERIAL_MAX_LEN] = { '\0' };
struct usb_bus* busses;
struct usb_bus* bus;
int i;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 's':
if (++i >= argc) {
usage(argv[0]);
exit(1);
}
strncpy(serial, argv[i], SERIAL_MAX_LEN);
serial[SERIAL_MAX_LEN - 1] = '\0';
break;
default:
usage(argv[0]);
exit(1);
}
}
}
if (serial[0] == '\0') {
usage(argv[0]);
exit(1);
}
usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();
if (busses == NULL) {
perror("Failed to access USB");
exit(1);
}
for (bus = busses; bus != NULL; bus = bus->next) {
struct usb_device* dev;
for (dev = bus->devices; dev != NULL; dev = dev->next) {
if (dev->descriptor.bDeviceClass != USB_CLASS_HUB) {
continue;
}
/* We've found a hub, loop over each connected device */
for (i = 0; i < dev->num_children; ++i) {
char devSerial[SERIAL_MAX_LEN] = { '\0' };
struct usb_device* child;
usb_dev_handle* udh;
child = dev->children[i];
if (child == NULL) {
/* It's not clear this would ever happen */
continue;
}
udh = usb_open(child);
if (udh == NULL) {
perror("Failed to open child usb device");
continue;
}
usb_claim_interface(udh, 0);
usb_get_string_simple(udh, child->descriptor.iSerialNumber,
devSerial, SERIAL_MAX_LEN);
if (!strncmp(serial, devSerial, SERIAL_MAX_LEN)) {
int busNum = atoi(bus->dirname);
int devNum = atoi(dev->filename);
int port = 0; /* How do I find this? */
printf("Device: bus: %d, device: %d, port: %d\n",
busNum, devNum, port);
exit(0);
}
usb_release_interface(udh, 0);
usb_close(udh);
}
}
}
fprintf(stderr, "Device not found.\n");
return 1;
}
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