Hi Andy,
with my custom SSDT table:
DefinitionBlock ("gpio_button.aml", "SSDT", 5, "ASEMsp", "GPIO_BTN", 1)
{
External (_SB_.GPO1, DeviceObj)
Scope (\_SB.GPO1)
{
Device (BTNS)
{
Name (_HID, "ASEM0005") // _HID: Hardware ID
PRP0001
Name (_UID, Zero) // _UID: Unique ID
Name (_DDN, "DDN - SW Readable Button") // _DDN: DOS
Device Name
Name (_STR, Unicode ("STR - SW Readable Button")) //
_STR: Description String
Name (_CRS, ResourceTemplate () // _CRS: Current
Resource Settings
{
GpioIo (
Shared, // Not shared
PullNone, // No need for
pulls
0, // Debounce
timeout
0, // Drive
strength
IoRestrictionInputOnly, // Only used
as input
"\\_SB.GPO1", // GPIO
controller
0, ResourceConsumer, , ) // Must be 0
{
25, // GPIO
number 25
}
})
}
}
}
I'm able to see the GPIO in:
/sys/bus/platform/devices/ASEM0005:00/firmware_node:
-r--r--r-- 1 root root 4096 Oct 2 12:10 description
-r--r--r-- 1 root root 4096 Oct 2 12:10 hid
-r--r--r-- 1 root root 4096 Oct 2 12:10 modalias
-r--r--r-- 1 root root 4096 Oct 2 12:10 path
lrwxrwxrwx 1 root root 0 Oct 2 12:10 physical_node ->
../../../../platform/INT3452:01/ASEM0005:00
drwxr-xr-x 2 root root 0 Oct 2 12:10 power
lrwxrwxrwx 1 root root 0 Oct 2 12:10 subsystem ->
../../../../../bus/acpi
-rw-r--r-- 1 root root 4096 Oct 2 12:10 uevent
-r--r--r-- 1 root root 4096 Oct 2 12:10 uid
and so I can see some useful info:
# cat description
STR - SW Readable Button
# cat hid
ASEM0005
# cat modalias
acpi:ASEM0005:
bmxxxx-x86-64:/sys/bus/platform/devices/ASEM0005:00/firmware_node# cat path
\_SB_.GPO1.BTNS
So, from userspace, I can discover the GPIO controller /dev/gpiochip1,
but I don't know how to discover the GPIO number (25 in this case).
Do you have any suggestion about how to discover this GPIO number?
Thanks!
> --
> With Best Regards,
> Andy Shevchenko
Best regards,
Flavio
