How to wakup system from standby via USB keyboard

How to wakup system from standby via USB keyboard

[Wu Zhangjin]

Hi All,

After reading some documents in Documentation/ and the Internet, I found
there is an interface /proc/acpi/wakeup to set the wakeup devices on
machines support ACPI. but my machine does not support ACPI,
no /proc/acpi/wakeup there.

my machine is FuLoong2F, which is loongson based machine, it does not
support ACPI, but currently, I have made it support basic standby mode
for it has a 'wait' mode(after setting it's frequency to ZERO) and can
be waked up via an external interrupt. and here is the basic framework:

0. suspend:

arch_suspend_disable_irqs(disable all interrupts)

...

fuloong_pm_enter()

...

arch_suspend_enable_irqs(enable all interrupts)

1. fuloong_pm_enter:

setup_wakeup_interrupts()

loongson_pm_enter(put loongson into 'wait' mode)

3. setup_wakeup_interrupts

if the interrupt line is connected to loongson directly, no setup need
to do, but if there is an interrupt line connected to loongson
indirectly(i.e via i8259A), I need to get through the interrupt path via
enable(un-mask) the interrupts in interrupt controller and resuming the
devices earlier manually or enable the interrupt bit on the devices and
even or set a flag of the device driver to tell the system not suspend
this device.

I have tried the first(resuming earlier) and second method(enable the
interrupt bit) on the 8042 keyboard o YeeLoong(another loongson-based
machine, a netbook, i8042 is connected to i8259A directly), it works
well, but not tried the third method yet.

I guess the /proc/acpi/wakeup based method in user-space should be
something like this, but is there any relative method in kernel space?

there are only USB interfaces on FuLoong2F machines, I guess it will be
very hard to get through the interrupt path via the above two methods(I
have tried to enable the USB interrupt in south bright, but not work),
so, is there an easier method to do it?

Thanks & Regards,
Wu Zhangjin

Re: How to wakup system from standby via USB keyboard

[Rafael J. Wysocki]

On Friday 21 August 2009, Wu Zhangjin wrote:
> Hi All,
> 
> After reading some documents in Documentation/ and the Internet, I found
> there is an interface /proc/acpi/wakeup to set the wakeup devices on
> machines support ACPI. but my machine does not support ACPI,
> no /proc/acpi/wakeup there.
> 
> my machine is FuLoong2F, which is loongson based machine, it does not
> support ACPI, but currently, I have made it support basic standby mode
> for it has a 'wait' mode(after setting it's frequency to ZERO) and can
> be waked up via an external interrupt. and here is the basic framework:
> 
> 0. suspend:
> 
> arch_suspend_disable_irqs(disable all interrupts)
> 
> ...
> 
> fuloong_pm_enter()
> 
> ...
> 
> arch_suspend_enable_irqs(enable all interrupts)
> 
> 1. fuloong_pm_enter:
> 
> setup_wakeup_interrupts()
> 
> loongson_pm_enter(put loongson into 'wait' mode)
> 
> 3. setup_wakeup_interrupts
> 
> if the interrupt line is connected to loongson directly, no setup need
> to do, but if there is an interrupt line connected to loongson
> indirectly(i.e via i8259A), I need to get through the interrupt path via
> enable(un-mask) the interrupts in interrupt controller and resuming the
> devices earlier manually or enable the interrupt bit on the devices and
> even or set a flag of the device driver to tell the system not suspend
> this device.
> 
> I have tried the first(resuming earlier) and second method(enable the
> interrupt bit) on the 8042 keyboard o YeeLoong(another loongson-based
> machine, a netbook, i8042 is connected to i8259A directly), it works
> well, but not tried the third method yet.
> 
> I guess the /proc/acpi/wakeup based method in user-space should be
> something like this, but is there any relative method in kernel space?
> 
> there are only USB interfaces on FuLoong2F machines, I guess it will be
> very hard to get through the interrupt path via the above two methods(I
> have tried to enable the USB interrupt in south bright, but not work),
> so, is there an easier method to do it?

Is your USB controller a PCI one?

Rafael

Re: How to wakup system from standby via USB keyboard

[Wu Zhangjin]

On Sat, 2009-08-22 at 00:06 +0200, Rafael J. Wysocki wrote:
> On Friday 21 August 2009, Wu Zhangjin wrote:
> > Hi All,
> > 
> > After reading some documents in Documentation/ and the Internet, I found
> > there is an interface /proc/acpi/wakeup to set the wakeup devices on
> > machines support ACPI. but my machine does not support ACPI,
> > no /proc/acpi/wakeup there.
> > 
> > my machine is FuLoong2F, which is loongson based machine, it does not
> > support ACPI, but currently, I have made it support basic standby mode
> > for it has a 'wait' mode(after setting it's frequency to ZERO) and can
> > be waked up via an external interrupt. and here is the basic framework:
> > 
> > 0. suspend:
> > 
> > arch_suspend_disable_irqs(disable all interrupts)
> > 
> > ...
> > 
> > fuloong_pm_enter()
> > 
> > ...
> > 
> > arch_suspend_enable_irqs(enable all interrupts)
> > 
> > 1. fuloong_pm_enter:
> > 
> > setup_wakeup_interrupts()
> > 
> > loongson_pm_enter(put loongson into 'wait' mode)
> > 
> > 3. setup_wakeup_interrupts
> > 
> > if the interrupt line is connected to loongson directly, no setup need
> > to do, but if there is an interrupt line connected to loongson
> > indirectly(i.e via i8259A), I need to get through the interrupt path via
> > enable(un-mask) the interrupts in interrupt controller and resuming the
> > devices earlier manually or enable the interrupt bit on the devices and
> > even or set a flag of the device driver to tell the system not suspend
> > this device.
> > 
> > I have tried the first(resuming earlier) and second method(enable the
> > interrupt bit) on the 8042 keyboard o YeeLoong(another loongson-based
> > machine, a netbook, i8042 is connected to i8259A directly), it works
> > well, but not tried the third method yet.
> > 
> > I guess the /proc/acpi/wakeup based method in user-space should be
> > something like this, but is there any relative method in kernel space?
> > 
> > there are only USB interfaces on FuLoong2F machines, I guess it will be
> > very hard to get through the interrupt path via the above two methods(I
> > have tried to enable the USB interrupt in south bridge, but not work),
> > so, is there an easier method to do it?
> 
> Is your USB controller a PCI one?

Yes.

and I just checked the file: drivers/usb/host/ohci-pci.c, there are two
functions ohci_pci_suspend/ohci_pci_resume there, perhaps I can call
these two functions directly to resume it earlier and suspend it again
before the real resuming, any easier methods? is there a flag to tell
the system not suspend it or just not disable the interrupt request?

Thanks,
Wu Zhangjin

Re: How to wakup system from standby via USB keyboard

[Alan Stern]

On Sat, 22 Aug 2009, Wu Zhangjin wrote:

> On Sat, 2009-08-22 at 00:06 +0200, Rafael J. Wysocki wrote:
> > On Friday 21 August 2009, Wu Zhangjin wrote:
> > > Hi All,
> > > 
> > > After reading some documents in Documentation/ and the Internet, I found
> > > there is an interface /proc/acpi/wakeup to set the wakeup devices on
> > > machines support ACPI. but my machine does not support ACPI,
> > > no /proc/acpi/wakeup there.
> > > 
> > > my machine is FuLoong2F, which is loongson based machine, it does not
> > > support ACPI, but currently, I have made it support basic standby mode
> > > for it has a 'wait' mode(after setting it's frequency to ZERO) and can
> > > be waked up via an external interrupt. and here is the basic framework:
> > > 
> > > 0. suspend:
> > > 
> > > arch_suspend_disable_irqs(disable all interrupts)
> > > 
> > > ...
> > > 
> > > fuloong_pm_enter()
> > > 
> > > ...
> > > 
> > > arch_suspend_enable_irqs(enable all interrupts)
> > > 
> > > 1. fuloong_pm_enter:
> > > 
> > > setup_wakeup_interrupts()
> > > 
> > > loongson_pm_enter(put loongson into 'wait' mode)
> > > 
> > > 3. setup_wakeup_interrupts
> > > 
> > > if the interrupt line is connected to loongson directly, no setup need
> > > to do, but if there is an interrupt line connected to loongson
> > > indirectly(i.e via i8259A), I need to get through the interrupt path via
> > > enable(un-mask) the interrupts in interrupt controller and resuming the
> > > devices earlier manually or enable the interrupt bit on the devices and
> > > even or set a flag of the device driver to tell the system not suspend
> > > this device.
> > > 
> > > I have tried the first(resuming earlier) and second method(enable the
> > > interrupt bit) on the 8042 keyboard o YeeLoong(another loongson-based
> > > machine, a netbook, i8042 is connected to i8259A directly), it works
> > > well, but not tried the third method yet.
> > > 
> > > I guess the /proc/acpi/wakeup based method in user-space should be
> > > something like this, but is there any relative method in kernel space?
> > > 
> > > there are only USB interfaces on FuLoong2F machines, I guess it will be
> > > very hard to get through the interrupt path via the above two methods(I
> > > have tried to enable the USB interrupt in south bridge, but not work),
> > > so, is there an easier method to do it?
> > 
> > Is your USB controller a PCI one?
> 
> Yes.
> 
> and I just checked the file: drivers/usb/host/ohci-pci.c, there are two
> functions ohci_pci_suspend/ohci_pci_resume there, perhaps I can call
> these two functions directly to resume it earlier and suspend it again
> before the real resuming, any easier methods? is there a flag to tell
> the system not suspend it or just not disable the interrupt request?

I think the interface you're looking for is

	/sys/bus/usb/devices/usbN/../power/wakeup

where N is the USB bus number.  This file defaults to "disabled"; if
you write "enabled" to it then the USB host controller will be enabled
as a wakeup source.  This should work even without ACPI; it uses the
PCI PME mechanism.

However you need to realize something: If you enable USB wakeups then
unplugging your USB keyboard or mouse will cause the computer to wake
up.

Alan Stern

Re: How to wakup system from standby via USB keyboard

[Wu Zhangjin]

On Fri, 2009-08-21 at 22:35 -0400, Alan Stern wrote:
> On Sat, 22 Aug 2009, Wu Zhangjin wrote:
> 
> > On Sat, 2009-08-22 at 00:06 +0200, Rafael J. Wysocki wrote:
> > > On Friday 21 August 2009, Wu Zhangjin wrote:
> > > > Hi All,
> > > > 
> > > > After reading some documents in Documentation/ and the Internet, I found
> > > > there is an interface /proc/acpi/wakeup to set the wakeup devices on
> > > > machines support ACPI. but my machine does not support ACPI,
> > > > no /proc/acpi/wakeup there.
> > > > 
> > > > my machine is FuLoong2F, which is loongson based machine, it does not
> > > > support ACPI, but currently, I have made it support basic standby mode
> > > > for it has a 'wait' mode(after setting it's frequency to ZERO) and can
> > > > be waked up via an external interrupt. and here is the basic framework:
> > > > 
> > > > 0. suspend:
> > > > 
> > > > arch_suspend_disable_irqs(disable all interrupts)
> > > > 
> > > > ...
> > > > 
> > > > fuloong_pm_enter()
> > > > 
> > > > ...
> > > > 
> > > > arch_suspend_enable_irqs(enable all interrupts)
> > > > 
> > > > 1. fuloong_pm_enter:
> > > > 
> > > > setup_wakeup_interrupts()
> > > > 
> > > > loongson_pm_enter(put loongson into 'wait' mode)
> > > > 
> > > > 3. setup_wakeup_interrupts
> > > > 
> > > > if the interrupt line is connected to loongson directly, no setup need
> > > > to do, but if there is an interrupt line connected to loongson
> > > > indirectly(i.e via i8259A), I need to get through the interrupt path via
> > > > enable(un-mask) the interrupts in interrupt controller and resuming the
> > > > devices earlier manually or enable the interrupt bit on the devices and
> > > > even or set a flag of the device driver to tell the system not suspend
> > > > this device.
> > > > 
> > > > I have tried the first(resuming earlier) and second method(enable the
> > > > interrupt bit) on the 8042 keyboard o YeeLoong(another loongson-based
> > > > machine, a netbook, i8042 is connected to i8259A directly), it works
> > > > well, but not tried the third method yet.
> > > > 
> > > > I guess the /proc/acpi/wakeup based method in user-space should be
> > > > something like this, but is there any relative method in kernel space?
> > > > 
> > > > there are only USB interfaces on FuLoong2F machines, I guess it will be
> > > > very hard to get through the interrupt path via the above two methods(I
> > > > have tried to enable the USB interrupt in south bridge, but not work),
> > > > so, is there an easier method to do it?
> > > 
> > > Is your USB controller a PCI one?
> > 
> > Yes.
> > 
> > and I just checked the file: drivers/usb/host/ohci-pci.c, there are two
> > functions ohci_pci_suspend/ohci_pci_resume there, perhaps I can call
> > these two functions directly to resume it earlier and suspend it again
> > before the real resuming, any easier methods? is there a flag to tell
> > the system not suspend it or just not disable the interrupt request?
> 
> I think the interface you're looking for is
> 
> 	/sys/bus/usb/devices/usbN/../power/wakeup
> 
> where N is the USB bus number.  This file defaults to "disabled"; if
> you write "enabled" to it then the USB host controller will be enabled
> as a wakeup source.  This should work even without ACPI; it uses the
> PCI PME mechanism.
> 

I checked the /sys/bus/usb.../wakeup interfaces, seems the
usbN/power/wakeup interfaces are enabled by default in my machine, but
the usbN/N-X:Y/power/wakeup is not available. so, I can not wakeup the
system via any USB devices.

Here is the output:

$ find /sys/bus/usb/devices/usb1/ -name "wakeup" -exec echo {} \; -exec
cat '{}' \;
/sys/bus/usb/devices/usb1/power/wakeup
enabled
/sys/bus/usb/devices/usb1/1-0:1.0/power/wakeup

/sys/bus/usb/devices/usb1/1-3/power/wakeup
enabled
/sys/bus/usb/devices/usb1/1-3/1-3:1.0/power/wakeup

/sys/bus/usb/devices/usb1/1-3/1-3:1.1/power/wakeup

/sys/bus/usb/devices/usb1/1-4/power/wakeup
enabled
/sys/bus/usb/devices/usb1/1-4/1-4:1.0/power/wakeup

$ find /sys/bus/usb/devices/usb2/ -name "wakeup" -exec echo {} \; -exec
cat '{}' \;
/sys/bus/usb/devices/usb2/power/wakeup
enabled
/sys/bus/usb/devices/usb2/2-0:1.0/power/wakeup

Thanks,
Wu Zhangjin

Re: How to wakup system from standby via USB keyboard

[Alan Stern]

On Sat, 22 Aug 2009, Wu Zhangjin wrote:

> > I think the interface you're looking for is
> > 
> > 	/sys/bus/usb/devices/usbN/../power/wakeup
> > 
> > where N is the USB bus number.  This file defaults to "disabled"; if
> > you write "enabled" to it then the USB host controller will be enabled
> > as a wakeup source.  This should work even without ACPI; it uses the
> > PCI PME mechanism.
> > 
> 
> I checked the /sys/bus/usb.../wakeup interfaces, seems the
> usbN/power/wakeup interfaces are enabled by default in my machine, but
> the usbN/N-X:Y/power/wakeup is not available. so, I can not wakeup the
> system via any USB devices.
> 
> Here is the output:
> 
> $ find /sys/bus/usb/devices/usb1/ -name "wakeup" -exec echo {} \; -exec
> cat '{}' \;
> /sys/bus/usb/devices/usb1/power/wakeup
> enabled
...

You did not read what I wrote.

You shouldn't look at: /sys/bus/usb/devices/usb1/power/wakeup.  
You should look at:    /sys/bus/usb/devices/usb1/../power/wakeup.

The N-X:Y/power/wakeup interfaces don't matter; the kernel doesn't 
use them.

Alan Stern

Re: How to wakup system from standby via USB keyboard

[Wu Zhangjin]

On Sat, 2009-08-22 at 10:08 -0400, Alan Stern wrote:
> On Sat, 22 Aug 2009, Wu Zhangjin wrote:
> 
> > > I think the interface you're looking for is
> > > 
> > > 	/sys/bus/usb/devices/usbN/../power/wakeup
> > > 
> > > where N is the USB bus number.  This file defaults to "disabled"; if
> > > you write "enabled" to it then the USB host controller will be enabled
> > > as a wakeup source.  This should work even without ACPI; it uses the
> > > PCI PME mechanism.
> > > 
> > 
> > I checked the /sys/bus/usb.../wakeup interfaces, seems the
> > usbN/power/wakeup interfaces are enabled by default in my machine, but
> > the usbN/N-X:Y/power/wakeup is not available. so, I can not wakeup the
> > system via any USB devices.
> > 
> > Here is the output:
> > 
> > $ find /sys/bus/usb/devices/usb1/ -name "wakeup" -exec echo {} \; -exec
> > cat '{}' \;
> > /sys/bus/usb/devices/usb1/power/wakeup
> > enabled
> ...
> 
> You did not read what I wrote.
> 
> You shouldn't look at: /sys/bus/usb/devices/usb1/power/wakeup.  
> You should look at:    /sys/bus/usb/devices/usb1/../power/wakeup.
> 
> The N-X:Y/power/wakeup interfaces don't matter; the kernel doesn't 
> use them.
> 

Sorry, I at first thought .. is only an ellipsis, because the TAB key of
keyboard can not list the files(Seems only symbol links to pci/
directories) :-)

There is really a such file in system of FuLoong2F, but seems the USB
controller is 'not' a PCI one(sorry for my mistake in the last E-mail),
this USB interface is integrated in the CS5536 southbridge, and
CS5536(from AMD) is connected to the PCI bus.

the connection is like this:

----------------------------------------
|         Loongson2F                   |
|                                      |                 ------------- 
|     CPU internal northbridge         |                 |            |
|(bonito64 compatiable, PCI controller)| <----PCI BUS -->| AMD CS5536 |
---------------------------------------                  |(USB inside)|
                                                         --------------
$ cat /sys/bus/usb/devices/usb1/../power/wakeup
[empty here]

but in YeeLoong System, for there is a NEC USB controller connect to PCI
BUS directly.

----------------------------------------
|         Loongson2F                   |
|            |                         |                 ------------- 
|     CPU internal northbridge         |                 |            |
|(bonito64 compatiable, PCI controller)| <----PCI BUS -->| AMD CS5536 |
---------------------------------------      |           |(USB inside)|
                                             |            --------------
                                             ---- USB HC
and the wakeup interface is really there:

$ cat /sys/bus/usb/devices/usb1/../power/wakeup
disabled

but after I enabled it,

$ echo enabled > /sys/bus/usb/devices/usb1/../power/wakeup

and ensured the USB interrupt is not disabled in the northbridge, but
unfortunately, I can NOT wakeup YeeLoong from standby mode via the
keyboard or mouse connect to NEC USB interface :-(

BTW: I have tested this wakeup interface on two different X86 machines,
both of them can be waked up from a USB keyboard or Mouse.

perhaps I have missed something else.

Thanks & Regards,
Wu Zhangjin