attach = ioctl(fd[0].fd, ATTACHED);
ioctl wil return '0' on success. so my understanding is you need to
pass the address of "status" to the ioctl and get the value.
eg: ioctl(fd, ATTACHED, &status);
if (status < 0)
{
printf("Printer Dettached\n");
}
On Thu, Jun 24, 2010 at 1:25 PM, Sandeep G.R <[email protected]> wrote:
> Hi Greg KH,
>
> I am using usb gadget printer driver for iMX25(ARM9)
> board and the kernel version is 2.6.31, now i have made an application
> which will open the driver from user space as "/dev/g_printer"
> whenever i connect the usb gadget to the host i need to detect from my
> application. I have made an switch case in ioctl function of
> /driver/usb/gadget/printer.c as
>
> switch (code) {
> case GADGET_GET_PRINTER_STATUS:
> status = (int)dev->printer_status;
> break;
> case GADGET_SET_PRINTER_STATUS:
> dev->printer_status = (u8)arg;
> break;
> case ATTACHED:
> PrintMessage("ioctl:Before usb_gadget_vbus_draw\n");
> status = usb_gadget_connect(dev->gadget);
> PrintMessage("ioctl:After usb_gadget_vbus_draw\n");
> break;
> default:
> /* could not handle ioctl */
> DBG(dev, "IntelliBar printer_ioctl: ERROR
> cmd=0x%4.4xis not supported\n",
> code);
> status = -ENOTTY;
> }
>
> in my application i have used the driver ioctl as
>
> static int attach;
> attach = ioctl(fd[0].fd, ATTACHED);
> printf("Attached=%d\n", attach);
> if(attach < 0)
> {
> printf("Printer Dettached\n");
> }
> else
> {
> printf("Printer Attached\n");
> }
>
> Now the question is whenever i connect the usb gadget to host the case
> ATTACHED is called from driver and it should return zero on success
> and -ve on error, when i will get attach = 0 always even if i connect
> to host or not.
>
> How to resolve this issue. Please help me asap.
>
>
> --
> Thanks & Regards,
> SANDEEP G R,
> --
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