On Sat, Apr 25, 2009 at 12:26:55PM -0700, Greg KH wrote:
> On Sat, Apr 25, 2009 at 02:43:57PM -0400, Alan Stern wrote:
> > Out of curiosity, I took a look at the source files. lsusb does use
> > libusb after all! Are you going to switch it over to pure sysfs and
> > libudev?
>
> I wasn't planning on doing that, I was going to switch usbview over to
> just use sysfs and libudev.
>
> We could switch lsusb to use just sysfs, but I don't think it would make
> much sense to use libudev, do you? Although it might make enumerating
> the USB devices easier... Hm, maybe I'll think about it, depending on
> how well the usbview changes go.
>
> Actually, the difference between usbview and lsusb is pretty small these
> days, maybe we can just make usbview the "gtk" version of lsusb :)
>
> I have 2 days of sitting with sick kids, watching hours of Sponge Bob,
> so I'll see how it goes...
Damm, libudev makes things very easy, nice job Kay.
Here's the equivalent of a "stock" lsusb output in 70 lines of C code,
using libudev instead of libusb.
"original lsusb":
$ lsusb
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 004: ID 08ff:2580 AuthenTec, Inc. AES2501 Fingerprint Sensor
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
"test program":
$ ./test
Bus 001 Device 001: ID 1d6b:0001 Linux 2.6.29 uhci_hcd UHCI Host Controller
Bus 002 Device 001: ID 1d6b:0001 Linux 2.6.29 uhci_hcd UHCI Host Controller
Bus 003 Device 001: ID 1d6b:0001 Linux 2.6.29 uhci_hcd UHCI Host Controller
Bus 003 Device 004: ID 08ff:2580 Fingerprint Sensor
Bus 004 Device 001: ID 1d6b:0002 Linux 2.6.29 ehci_hcd EHCI Host Controller
Not bad...
I can switch over to just parsing the descriptor directly from the
"descriptors" file in sysfs, and probably not need libusb at all...
fun stuff.
greg k-h
------------------
#include <stdio.h>
#include <string.h>
#include "libudev.h"
static void print_device(struct udev_device *device)
{
const char *busnum_str;
const char *devnum_str;
const char *vendor_id;
const char *product_id;
const char *manufacturer_str;
const char *product_str;
int busnum, devnum;
vendor_id = udev_device_get_sysattr_value(device, "idVendor");
product_id = udev_device_get_sysattr_value(device, "idProduct");
busnum_str = udev_device_get_sysattr_value(device, "busnum");
devnum_str = udev_device_get_sysattr_value(device, "devnum");
manufacturer_str = udev_device_get_sysattr_value(device, "manufacturer");
product_str = udev_device_get_sysattr_value(device, "product");
busnum = atoi(busnum_str);
devnum = atoi(devnum_str);
printf("Bus %.03d Device %.03d: ID %s:%s",
busnum, devnum, vendor_id, product_id);
if (manufacturer_str)
printf(" %s", manufacturer_str);
if (product_str)
printf(" %s", product_str);
printf("\n");
}
static int test_enumerate_print_list(struct udev_enumerate *enumerate)
{
struct udev_list_entry *list_entry;
const char *str;
udev_list_entry_foreach(list_entry,
udev_enumerate_get_list_entry(enumerate)) {
struct udev_device *device;
device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
udev_list_entry_get_name(list_entry));
if (device != NULL) {
str = udev_device_get_devtype(device);
if ((str != NULL) &&
(strcmp(str, "usb_device") == 0))
print_device(device);
udev_device_unref(device);
}
}
return 0;
}
int main(int argc, char *argv[])
{
struct udev *udev = NULL;
struct udev_enumerate *udev_enumerate;
udev = udev_new();
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return -1;
udev_enumerate_add_match_subsystem(udev_enumerate, "usb");
udev_enumerate_scan_devices(udev_enumerate);
test_enumerate_print_list(udev_enumerate);
udev_enumerate_unref(udev_enumerate);
udev_unref(udev);
return 0;
}
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