Re: ACPI defined devices not showing up under /sys/bus/platform/devices

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Fri, Sep 19, 2014 at 08:48:49AM -0300, Marcos Paulo de souza wrote:
> Hi,
> 
> On 09/19/2014 05:47 AM, Mika Westerberg wrote:
> >On Thu, Sep 18, 2014 at 06:02:40PM -0300, Marcos Paulo de souza wrote:
> >>Hi,
> >>
> >>On 09/18/2014 05:49 PM, Hans de Goede wrote:
> >>>Hi,
> >>>
> >>>On 09/18/2014 04:01 PM, Mika Westerberg wrote:
> >>>>On Thu, Sep 18, 2014 at 02:04:11PM +0200, Hans de Goede wrote:
> >>>>>Hi,
> >>>>>
> >>>>>I'm trying to help various users with Asus X450 and Asus X550 laptops
> >>>>>to get their touchpad to work:
> >>>>>
> >>>>>https://bugzilla.redhat.com/show_bug.cgi?id=1110011
> >>>>>
> >>>>>We believe that this touchpad is connected over i2c, using the
> >>>>>i2c-designware-platform driver.
> >>>>>
> >>>>>If you look at the DSDT attached there you can clearly see
> >>>>>nodes defines which should lead to e.g. :
> >>>>>
> >>>>>/sys/bus/platform/devices/INT33C2:00
> >>>>>
> >>>>>Showing up (which should then be bound by i2c-designware-platform).
> >>>>>
> >>>>>But nothing is showing up, not a single ACPI defined device shows
> >>>>>up actually:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>[root@asusx550 devices]# ll
> >>>>>insgesamt 0
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 alarmtimer -> ../../../devices/platform/alarmtimer
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 asus-nb-wmi -> ../../../devices/platform/asus-nb-wmi
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 coretemp.0 -> ../../../devices/platform/coretemp.0
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 efi-framebuffer.0 -> ../../../devices/platform/efi-framebuffer.0
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 Fixed MDIO bus.0 -> ../../../devices/platform/Fixed MDIO bus.0
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 i8042 -> ../../../devices/platform/i8042
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 iTCO_wdt -> ../../../devices/pci0000:00/0000:00:1f.0/iTCO_wdt
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 microcode -> ../../../devices/platform/microcode
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 pcspkr -> ../../../devices/platform/pcspkr
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 regulatory.0 -> ../../../devices/platform/regulatory.0
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 rtsx_pci_ms.0 -> ../../../devices/pci0000:00/0000:00:1c.2/0000:02:00.0/rtsx_pci_ms.0
> >>>>>lrwxrwxrwx. 1 root root 0 25. Jul 23:54 rtsx_pci_sdmmc.0 -> ../../../devices/pci0000:00/0000:00:1c.2/0000:02:00.0/rtsx_pci_sdmmc.0
> >>>>>lrwxrwxrwx. 1 root root 0 22. Jul 14:56 serial8250 -> ../../../devices/platform/serial8250
> >>>>>
> >>>>>
> >>>>>Which is weird, since any recent machine usually has at least one or 2
> >>>>>show up.
> >>>>It depends whether the BIOS has enabled those or not.
> >>>>
> >>>>If
> >>>>
> >>>>  # cat /sys/bus/acpi/devices/INT33C2:00/status
> >>>>  # cat /sys/bus/acpi/devices/INT33C3:00/status
> >>>>
> >>>>returns 0xf, then the device should be there, otherwise it is not.
> >>>Interesting. Marcos, can you give this a try please ?
> >>Hans, both here returned 0. As I said to you, I'm using Fedora in insecure
> >>mode (I don't know if this changes anything).
> >That just means that your BIOS has disabled these devices. Unless there
> >is a menu somewhere in BIOS setup to enable these, there is nothing we
> >can do in the kernel to make them appear.
> Interesting. This machine came with Windows 8, and removed. The touchpad was
> working on Windows. Mika, I verified my BIOS configurations and there isn't
> any configuration to enable PCI devices. Do you beleive there is something
> about secure boot? As it worked with Windows, hwo can it be detected on
> Linux?

Are you sure that your touch pad is connected to I2C bus in the first
place?

In your ACPI DSDT, there is also a device called PS2M that happens to to
look like touch pad to me. For example it reports one of these _HIDs:

                    Method (_HID, 0, NotSerialized)  // _HID: Hardware ID
                    {
                        If (SYNA)
                        {   
                            Return (0x190A2E4F)
                        }

                        If (ALPS)
                        {   
                            Return (0x0713A906)
                        }

                        If (ELAN)
                        {   
                            Return (0x08018416)
                        }

                        If (STLC)
                        {   
                            Return (0x41C18C4E)
                        }

                        If (FOLT)
                        {
                            Return (0x01019419)
                        }

                        Return (0x060A2E4F)
                    }

Have you checked if any of these are present in /sys/bus/acpi/devices/*?

> >
> >>>>The "status" refers directly shat _STA() ACPI method returns.
> >>>Ok, so assuming that Marcos' testing shows it is not enabled,
> >>>is there anything we can, could there be some ACPI call to
> >>>enable these devs ?
> >>>
> >>>>Note that the device could also be in PCI mode, in case lspci should
> >>>>show it.
> >>>Right, it does not show in lspci.
> >OK. So I think that this particular machine, either does not have Intel
> >LPSS (it is not Haswell-LP) or the devices have been deliberately
> >disabled for some reason.
> How can I verify this?

Can you send me output of lspci -vv?