Date: Sat, 29 Sep 2007 07:42:16 -0700 From: Chuck T. <freebsdfan@hotmail.com> To: Xiaofan Chen <xiaofanc@gmail.com> Cc: freebsd-usb@freebsd.org Subject: RE: snd_uaudio with libusb ? Message-ID: <BAY116-W369496EF9838627D320790C7B30@phx.gbl> In-Reply-To: <a276da400709290213v6d747d3bh4f3e4de212d5b602@mail.gmail.com> References: <BAY116-W4072AA56B15EBD7B73FAC9C7B20@phx.gbl> <a276da400709281906m28bacac2r80c27074e222c597@mail.gmail.com> <BAY116-W245D862663F945A3204C2CC7B30@phx.gbl> <a276da400709290213v6d747d3bh4f3e4de212d5b602@mail.gmail.com>
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> On 9/29/07, Chuck T. <freebsdfan@hotmail.com> wrote:
> >
> > >I think your device is a USB composite USB device with two
> > >interfaces (one for USB audio and the other for GPIO). How
> > >do you control the GPIO under Linux (by control transfer
> > >or interrupt/bulk transfer)? If the Linux application indeed
> > >works at the same time as the USB audio, then Linux
> > >does bind different driver to different interfaces (one for
> > >the usb audio interface and no driver for the GPIO interface).
> >
> > I talk to the GPIO bits via vendor specific requests to the control pip=
e.
> > I do a usb_open() when my application loads and never close it. When I=
need
> > to set a GPIO bit I use usb_control_msg(). I've never "looked under th=
e
> > covers" to see why it works, but it does.
> >
>=20
> So this works under Linux but not FreeBSD. Maybe this is just a limitatio=
n
> of libusb under FreeBSD. Anyway, it is said that libusb is just a thin
> wrapper on top of USB. You may want to use the lower level api instead.
Yes I believe that is the case. I'm hoping there is a simple fix that will=
allow
me to use libusb for OS portability. I don't want to have to write OS spec=
ific
code if I can avoid it. I've been using FreeBSD since the 1.0 and I really
want my app to run on FreeBSD but frankly 90% of the users will probably
be running on Linux anyway.
> I confess I do not know further (like how to bind ugen to individual inte=
rfaces
> and use IOCTL to perform usb transfer). But if post some codes,
> others may be able to help you.
Sure. I doubt it will help as the problem is related to libusb but here's =
my code:
static usb_dev_handle *udev =3D NULL;
void UsbKeyRadio(int bKey)
{
int ret;
char Buf[2] =3D {0xff,0xff};
if(bKey) {
// Set PTT bit low
Buf[0] =3D 0;
}
else {
// Set PTT bit high
Buf[0] =3D 0x20;
}
ret =3D usb_control_msg(udev,USB_TYPE_VENDOR,WRITE_GPIO,0,0,Buf,2,1000);
if(ret !=3D 2) {
LOG_ERROR(("%s#%d: usb_control_msg returned %d (%s)\n",__FUNCTION__,
__LINE__,ret,Err2String(errno)));
}
}
int UsbInit(void)
{
struct usb_bus *bus;
struct usb_device *dev =3D NULL;
int Ret =3D ERR_USB_DEV_OPEN; // assume the worse
usb_init();
usb_find_busses();
usb_find_devices();
for (bus =3D usb_busses; bus && dev =3D=3D NULL; bus =3D bus->next) {
for (dev =3D bus->devices; dev; dev =3D dev->next) {
if(dev->descriptor.idVendor =3D=3D 0x074d &&=20
dev->descriptor.idProduct =3D=3D 0x3556)
{
break;
}
else if(dev->descriptor.idVendor =3D=3D 0x077d &&=20
dev->descriptor.idProduct =3D=3D 0x07af)
{
break;
}
}
}
if(dev !=3D NULL) {
if((udev =3D usb_open(dev)) !=3D NULL) {
Ret =3D 0;
}
}
else {
LOG_ERROR(("%s: USB device not found\n",__FUNCTION__));
}
return Ret;
}
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