So, ACPI team ... will there be any signed-off-by lines forthcoming?
On at least the first two patches, which are now known to work and
which don't raise any cross-platform issues.
And if you could share an explanation for why sometimes PCI bridges
seem to get marked as wakeup-capable in the ACPI tables, that would
be nice too ...
- Dave
On Thursday 05 April 2007 12:48 pm, David Brownell wrote:
> Following are three patches for basic driver model wakeup flag support on
> PCs. I think the first two are nearly mergable. The third previously broke
> powerpc, so it's likely not yet mergeable ... the issue was arch-specific
> differences in PCI initialization, someone else will need to solve them.
>
> The patches are:
>
> - Define a platform_enable_wakeup() PM hook and use it with PCI. (This
> might help OLPC with its non-RTC events...)
>
> - Make ACPI init and use driver model wakeup flags for the (motherboard)
> devices in its table ... and implement that new platform hook. Now
> /proc/acpi/wakeup is almost purely informative.
>
> - Update PCI to set those flags on devices that can issue PME#/WAKE#;
> this gets overridden by ACPI, except for add-on cards.
>
> Now, I've not yet made time to test whether the results _work_ but they
> do look like they do the right thing. (So far I've had lousy luck seeing
> ACPI recover from wake events...) The script I append (which I've posted
> before) gave the following on one system:
>
> input on acpi_system:00/device:00/PNP0C0E:00
> on pci0000:00/0000:00:09.0
> lan on pci0000:00/0000:00:04.0
> hub on pci0000:00/0000:00:03.3/usb1
> usb_host on pci0000:00/0000:00:03.3
> hub on pci0000:00/0000:00:03.1/usb3
> usb_host on pci0000:00/0000:00:03.1
> input on pci0000:00/0000:00:03.0/usb2/2-1/2-1.1
> hub on pci0000:00/0000:00:03.0/usb2/2-1
> hub on pci0000:00/0000:00:03.0/usb2
> usb_host on pci0000:00/0000:00:03.0
> modem on pci0000:00/0000:00:02.7
> on pci0000:00
> tty on pnp0/00:08
> on pnp0/00:06
> on pnp0/00:05
> rtc on pnp0/00:02
>
> Notice the external USB hub and keyboard. The i8042 drivers don't
> seem to list themselvs as input drivers in the usual way, or those
> PS2 kbd/aux nodes would also say "input". PCI 00:09.0 is an add-in
> card, invisible without the third patch; it'd be a USB host if it
> had a Linux driver.
>
> - Dave
>
> #!/bin/bash
> # pm-wake
>
> # classfilename *:* ==> $type
> class_label ()
> {
> case $1 in
> # recognize common types of wakeup-capable devices
> i2c-dev:*) type="smbus "; return 0;;
> input:*) type="input "; return 0;;
> mmc_host:*) type="mmc_host "; return 0;;
> net:eth*) type="lan "; return 0;;
> net:*) type="net "; return 0;;
> pcmcia_socket:*)type="pcmcia "; return 0;;
> rtc:*) type="rtc "; return 0;;
> sound:*) type="modem "; return 0;;
> tty:*) type="tty "; return 0;;
> usb_host:*) type="usb_host "; return 0;;
> esac
> return 1
> }
>
> # interface_label $PATH ==> $type
> interface_label ()
> {
> for F in $(cd $1 >/dev/null 2>&1 ; echo *:*)
> do
> class_label $F && return
> done
> }
>
> # devtype $PATH ==> $type
> devtype ()
> {
> local F T
>
> # fixed length, currently ten spaces
> type=""
>
> for F in $(cd $1 >/dev/null 2>&1 ; echo *:*)
> do
> if [ ! -d "$1/$F" ]
> then
> break;
> fi
>
> # is this a usb interface?
> if [ -f $1/$F/bInterfaceClass ]
> then
> interface_label $1/$F && return
> fi
>
> case $F in
> # use interface's label if possible, else generic
> usb_device:*)
> read T < $1/maxchild
> if [ 0 -lt $T ]
> then
> type="hub "
> return
> fi
> type="(usb) "
> continue;;
> *:*) class_label $F && return ;;
> esac
>
> done
>
> if [ "$type" = "" ]
> then
> for T in $(cd $1 >/dev/null 2>&1 ; echo fw-host*/ieee1394_host:*)
> do
> if [ ! -L "$1/$T" ]
> then
> break;
> fi
> type="firewire "
> return
> done
> fi
>
> if [ "$type" = "" ]
> then
> type=" "
> fi
> }
>
> cd /sys/devices
> for F in $(find * -name 'wakeup')
> do
> # F=.../power/wakeup
> read value < $F
> if [ "$value" = "" ]
> then
> continue
> fi
>
> # F=...
> F=$(dirname $(dirname $F))
> devtype $F
>
> # for each entry that actually supports wakeup, one line with:
> # - device type (if recognized)
> # - wake on/OFF
> # - /sys/devices/... path
> case "$value" in
> "disabled") echo "$type OFF $F" ;;
> "enabled") echo "$type on $F" ;;
> esac
> done
>
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