On Tuesday 27 January 2009 10:17:52 am Ville Syrjälä wrote:
> On Tue, Jan 27, 2009 at 08:52:51AM -0700, Bjorn Helgaas wrote:
> > Oh. That sounds like a BIOS bug. If there's only one actual
> > chip, the BIOS should not report it as two separate devices.
>
> It's not a bug. The cs423x chips contain several logical devices.
> WSS, MPU401, joystick etc.
Sorry it took me so long to get back to this.
Yes, you're right. I was thinking the first device had a set of
resources, and the second device had a superset that included the
same resources plus another one, but that's not the case here.
> The control logical device (which is
> not present in the early models) is unfortunately some kind of dumping
> ground for new registers to keep the other logical devices' backwards
> compatible. It contains at least some extra mixer control registers and
> power management registers.
In this case, you have:
/sys/bus/pnp/devices/00:0f/id:CSC0000
/sys/bus/pnp/devices/00:0f/resources:state = active
/sys/bus/pnp/devices/00:0f/resources:io 0x530-0x537
/sys/bus/pnp/devices/00:0f/resources:io 0x388-0x38b
/sys/bus/pnp/devices/00:0f/resources:io 0x220-0x22f
/sys/bus/pnp/devices/00:0f/resources:irq 5
/sys/bus/pnp/devices/00:0f/resources:dma 1
/sys/bus/pnp/devices/00:0f/resources:dma 0
/sys/bus/pnp/devices/00:10/id:CSC0010
/sys/bus/pnp/devices/00:10/resources:state = active
/sys/bus/pnp/devices/00:10/resources:io 0x210-0x217
Can't you just register another struct pnp_driver that claims the
CSC0010 device? E.g., something like:
static struct pnp_dev *ctrl;
static int snd_cs423x_ctrl_pnpbios_detect(struct pnp_dev *dev, ...)
{
if (pnp_device_is_isapnp(dev)
return -ENOENT;
ctrl = dev;
return 0;
}
static const struct pnp_device_id snd_cs423x_ctrl_ids[] = {
{ .id = "CSC0010" },
};
static struct pnp_driver cs423x_ctrl_pnp_driver = {
.id_table = snd_cs423x_ctrl_ids,
.probe = snd_cs423x_ctrl_pnpbios_detect,
};
Obviously that doesn't work for multiple cs423x chips, but I think we
had that problem before. For ISAPNP, we have the "card" concept to
group the related logical devices. But I don't see anything similar
in PNPBIOS (maybe I missed it), so I don't see how we could keep track
of multiple PNPBIOS cs423x chips.
Bjorn
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