[ERROR]: -ENODEV Error!

[ERROR]: -ENODEV Error!

[Felipe Balbi]

Hello all,

I'm getting some "No such Device" messages when loading any of the g_* 
modules.
I was trying to hack omap_udc.c and I figured out the error is with the 
first "sanity test", as called in the source-code:

int usb_gadget_register_driver (struct usb_gadget_driver *driver)
{
        int             status = -ENODEV;
        struct omap_ep  *ep;
        unsigned long   flags;

        /* basic sanity tests */
        if (!udc)       <---- THIS IS GIVING ME THE ERROR... I COMMENTED 
THIS AND
                return -ENODEV;
        if (!driver 
                        // FIXME if otg, check:  driver->is_otg
                        || driver->speed < USB_SPEED_FULL
                        || !driver->bind
                        || !driver->unbind
                        || !driver->setup)    <------ THIS GAVE ME 
ANOTHER BUG!!! :-P
                return -EINVAL;

        spin_lock_irqsave(&udc->lock, flags);
        if (udc->driver) {
                spin_unlock_irqrestore(&udc->lock, flags);
                return -EBUSY;
        }


The error:
# modprobe g_serial
udc: OMAP UDC driver, version: 4 October 2004 (iso) (dma)
udc: OMAP UDC rev 6.1, Mini-AB
gs_module_init: cannot register gadget driver, ret=-19
FATAL: Error inserting g_serial 
(/lib/modules/2.6.19-rc4-omap1-gfb280632-dirty/kernel/drivers/usb/gadget/g_serial.ko): 
No such device

-- 
Best Regards,

Felipe Balbi
ext-felipe.lima@nokia.com
OSMRC - INdT

Re: [ERROR]: -ENODEV Error!

[David Brownell]

On Monday 06 November 2006 10:52 am, Felipe Balbi wrote:
> int usb_gadget_register_driver (struct usb_gadget_driver *driver)
> {
>         int             status = -ENODEV;
>         struct omap_ep  *ep;
>         unsigned long   flags;
> 
>         /* basic sanity tests */
>         if (!udc)       <---- THIS IS GIVING ME THE ERROR... 

Then your board setup is probably wrong, so that probe() didn't get
called because there was no USB peripheral controller.  Or probe()
failed for some reason.

This realy _is_ a fatal error...

>                 return -ENODEV;
>         if (!driver 
>                         // FIXME if otg, check:  driver->is_otg
>                         || driver->speed < USB_SPEED_FULL
>                         || !driver->bind
>                         || !driver->unbind
>                         || !driver->setup)    <------ THIS GAVE ME 
> ANOTHER BUG!!! :-P

Also a fatal error.  Gadget drivers **MUST** handle control messages, e.g.
so they will send device descriptors.

- Dave