From: Flavio Suligoi <f.suligoi@asem.it>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: How to use an ACPI declared GPIO in a userspace ...
Date: Wed, 30 Sep 2020 15:39:13 +0000 [thread overview]
Message-ID: <2c26adae711145639d0b982a354aff3c@asem.it> (raw)
In-Reply-To: <20200930130113.GQ3956970@smile.fi.intel.com>
Hi Andy,
> I guess you simply didn't get. The "gpio-line-names" property of GPIO
> *controller* (provider!) and you are trying to do something with the
> *consumer*
> if I got it right.
>
> And of course GPIO line, which has name, has no difference in use from
> another
> w/o name assigned. You will need to request it by *consumer* either in
> kernel
> or in user space.
>
> To be more precise we have to look at your DSDT.
>
> --
> With Best Regards,
> Andy Shevchenko
>
My SSDT table is:
DefinitionBlock ("gpio_button.aml", "SSDT", 5, "ASEMsp", "GPIO_BTN", 1)
{
External (_SB_.GPO1, DeviceObj)
Scope (\_SB.GPO1)
{
Device (BTNS)
{
Name (_HID, "PRP0001")
Name (_DDN, "GPIO buttons device")
Name (_CRS, ResourceTemplate ()
{
GpioIo (
Exclusive, // 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
{
1, // GPIO number
}
})
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {
"gpio-line-names",
Package () {
"USER_PUSH_BUTTON",
}
},
}
})
}
}
}
And the kernel messages, after loading the table, are:
ACPI: Host-directed Dynamic ACPI Table Load:
ACPI: SSDT 0xFFFF908274285200 0000E8 (v05 ASEMsp GPIO_BTN 00000001 INTL 20200717)
ACPI: \_SB_.GPO1.BTNS: PRP0001 requires 'compatible' property
So I need a "consumer", but I don't want to export the GPIO using its number...
If you have any suggestion ...
Thanks!
Flavi
next prev parent reply other threads:[~2020-09-30 15:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 15:37 How to use an ACPI declared GPIO in a userspace Flavio Suligoi
2020-09-29 15:47 ` Bartosz Golaszewski
2020-09-29 16:10 ` Andy Shevchenko
2020-09-29 16:21 ` Flavio Suligoi
2020-09-29 16:27 ` Andy Shevchenko
2020-09-30 12:04 ` Flavio Suligoi
2020-09-30 13:01 ` Andy Shevchenko
2020-09-30 15:39 ` Flavio Suligoi [this message]
2020-09-30 15:54 ` Andy Shevchenko
2020-09-30 16:10 ` Andy Shevchenko
2020-10-02 10:02 ` Flavio Suligoi
2020-10-02 12:48 ` Andy Shevchenko
2020-10-02 13:23 ` Andy Shevchenko
2020-10-02 13:29 ` Flavio Suligoi
2020-10-02 10:26 ` Flavio Suligoi
2020-10-02 12:40 ` Andy Shevchenko
2020-09-29 16:10 ` Flavio Suligoi
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