Problem with accessing HPET from userspace

[Balaji Rao <balajirrao@xxxxxxxxx>]

Hi all,

I was trying to use the userspace program given in Documentation/hpet.txt and 
i could not get it working. The HPET_IE_ON ioctl was failing.

My HPET has 3 64 bit timers as I can see from the dmesg and they use interrups 
2, 8, and 0. The zero is creating the problem in the function hpet_ioctl_ieon 
and causes an -EIO to be returned because the IRQ is zero.

hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
hpet0: 3 64-bit timers, 14318180 Hz

My /proc/interrupts shows me that IRQ 0 is timer and 8 is rtc. So, if am 
correct, i should be given the IRQ 2. But surprisingly the hpet_open function 
finds other hpet timers to be either open or busy and returns the last one 
with irq 0.

           CPU0       CPU1       
  0:         87          0   IO-APIC-edge      timer
  1:      11575          0   IO-APIC-edge      i8042
  7:          0          0   IO-APIC-edge      parport0
  8:          3          0   IO-APIC-edge      rtc
  9:          0          0   IO-APIC-fasteoi   acpi
 12:     309431          0   IO-APIC-edge      i8042
 14:         44          0   IO-APIC-edge      libata
 15:          0          0   IO-APIC-edge      libata
 16:         66          0   IO-APIC-fasteoi   i915@pci:0000:00:02.0
 17:      32839          0   IO-APIC-fasteoi   uhci_hcd:usb3, libata
 18:          2          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
 19:     157562          0   IO-APIC-fasteoi   uhci_hcd:usb4
 20:     121978          0   IO-APIC-fasteoi   uhci_hcd:usb5, HDA Intel
NMI:          0          0   Non-maskable interrupts
LOC:     476178     331599   Local timer interrupts
RES:      11690      16146   Rescheduling interrupts
CAL:       2638      14995   function call interrupts
TLB:       2068       2058   TLB shootdowns
TRM:          0          0   Thermal event interrupts
SPU:          0          0   Spurious interrupts
ERR:          0
MIS:          0

Is it a problem with my ACPI tables ?

Am i missing something here ? Please help me.

thank you,
balaji rao

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