Attaching pseudo bus to i386 nexus bus.

[Warner Losh]

The nexus bus doesn't automatically add children.  You need to do that yourself with an identify routine.

Warner


On Dec 20, 2011, at 8:55 PM, ss griffon wrote:

> I've been playing around with the hdac sound driver and as an exercise
> I decided to make my own "pseudo" pcm driver.  However, I can't seem
> to get my device_probe and device_attach functions to be called on my
> "pseudo" bus driver.  I've spent a lot of time looking at the bus code
> in kernel/subr_bus.c and I think I have a good understanding of it but
> apparently not good enough.  I've looked at other devices that
> implement buses, such as hdac, pci and acpi (which hangs off of nexus
> as well) and I can't find what they are doing to make their
> device_probe/device_attach to be called.  Perhaps my driver is missing
> a reference to a parent?  Anyway, any help would be greatly
> appreciated, maybe it is something very obvious.  I turned on the
> BUS_DEBUG option and provide it's output along with the code.
> 
> Code:
> 
> #ifdef HAVE_KERNEL_OPTION_HEADERS
> #include "opt_snd.h"
> #endif
> 
> #include <dev/sound/pcm/sound.h>
> #include <dev/sound/pcm/pcm.h>
> 
> #include "device_if.h"
> #include "bus_if.h"
> #include "mixer_if.h"
> 
> static int
> snd_loop_bus_probe(device_t dev)
> {
>  printf("%s %d called\n", __func__, __LINE__);
>  return 0;
> }
> 
> static int
> snd_loop_bus_attach(device_t dev)
> {
>  printf("%s %d called\n", __func__, __LINE__);
>  return 0;
> }
> 
> static void
> snd_loop_bus_driver_added(device_t dev, driver_t *driver)
> {
>  printf("%s %d called\n", __func__, __LINE__);
> }
> 
> static device_method_t snd_loop_bus_methods[] = {
>  DEVMETHOD(device_probe,	snd_loop_bus_probe),
>  DEVMETHOD(device_attach,	snd_loop_bus_attach),
>  /*Bus Interface*/
>  DEVMETHOD(bus_driver_added,	snd_loop_bus_driver_added),
>  { 0, 0 }
> };
> 
> static driver_t snd_loop_bus_driver = {
>  "snd_loop_bus",
>  snd_loop_bus_methods,
>  PCM_SOFTC_SIZE, /*This isn't used, should be 1*/
> };
> 
> devclass_t snd_loop_bus_devclass;
> DRIVER_MODULE(snd_loop_bus, nexus, snd_loop_bus_driver,
> snd_loop_bus_devclass, 0, 0);
> 
> 
> 
> BUS_DEBUG Output:
> 
> devclass_find_internal:914: looking for nexus
> driver_module_handler:4462: Loading module: driver snd_loop_bus on bus
> nexus (pass 2147483647)
> devclass_add_driver:1047: snd_loop_bus
> devclass_find_internal:914: looking for snd_loop_bus
> devclass_find_internal:924: creating snd_loop_bus
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