Date: Mon, 22 Aug 2016 16:51:03 +0300 From: "karu.pruun" <karu.pruun@gmail.com> To: freebsd-hackers@freebsd.org Subject: problem attaching driver at LPC bus Message-ID: <CADdF=MJY4OGEXJCo60NoxTZAVkN74TpyLTUYWpbcG4XnPm1aEg@mail.gmail.com>
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Hello
I am trying to write a small driver for a device (gmux) attached to the LPC
bus, but am stuck with allocation of I/O ports. The device shows as
follows:
---
devinfo -rv | grep GMUX:
unknown pnpinfo _HID=APP000B _UID=0 at handle=\_SB_.PCI0.LPCB.GMUX
---
I took cue from sys/dev/acpica/acpi_ec.c. Probing works fine with
ACPI_ID_PROBE in analogy to acpi_ec.c:
--- ---
sys/dev/acpica/acpi_ec.c:
---
acpi_ec_probe(. . .)
{
. . .
ACPI_ID_PROBE(device_get_parent(dev), dev, ec_ids)
. . .
}
--- ---
Then attach() calls bus_alloc_resource():
--- ---
sys/dev/acpica/acpi_ec.c:
---
acpi_ec_attach(. . .)
{
struct resource *res;
. . .
res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
&sc->ec_data_rid, RF_ACTIVE);
. . .
}
--- ---
But this fails for my driver, res is always NULL. I looked up acpi tables
(acpidump -td), the IO resources for GMUX are there:
--- ---
Scope (\_SB.PCI0.LPCB)
{
Device (GMUX)
{
Name (_HID, EisaId ("APP000B")) // _HID: Hardware ID
Name (_CID, "gmux") // _CID: Compatible ID
Name (_STA, 0x0B) // _STA: Status
Name (_CRS, ResourceTemplate () // _CRS: Current Resource
Settings
{
IO (Decode16,
0x0700, // Range Minimum
0x07FF, // Range Maximum
0x01, // Alignment
0xFF, // Length
)
})
--- ---
Could someone explain where I have gone wrong?
Thank you
Peeter
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