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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