From: Arnd Bergmann <arnd@arndb.de>
A few old machines have not been converted away from the old-style
gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY
symbol so the code still works where it is needed but can be left
out otherwise.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/input/misc/Kconfig | 3 +++
drivers/platform/x86/Kconfig | 3 +++
drivers/platform/x86/x86-android-tablets/Kconfig | 1 +
3 files changed, 7 insertions(+)
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 0fb21c99a5e3..681d4123ef2b 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -860,6 +860,9 @@ config INPUT_IDEAPAD_SLIDEBAR
config INPUT_SOC_BUTTON_ARRAY
tristate "Windows-compatible SoC Button Array"
depends on KEYBOARD_GPIO && ACPI
+ depends on X86
+ depends on GPIOLIB
+ select GPIOLIB_LEGACY
help
Say Y here if you have a SoC-based tablet that originally runs
Windows 8 or a Microsoft Surface Book 2, Pro 5, Laptop 1 or later.
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 6d238e120dce..979a2fce8fc1 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -309,6 +309,7 @@ config MERAKI_MX100
depends on GPIOLIB
depends on GPIO_ICH
depends on LEDS_CLASS
+ select GPIOLIB_LEGACY
select LEDS_GPIO
help
This driver provides support for the front button and LEDs on
@@ -564,6 +565,7 @@ config PCENGINES_APU2
depends on INPUT && INPUT_KEYBOARD && GPIOLIB
depends on LEDS_CLASS
select GPIO_AMD_FCH
+ select GPIOLIB_LEGACY
select KEYBOARD_GPIO_POLLED
select LEDS_GPIO
help
@@ -591,6 +593,7 @@ config PORTWELL_EC
config BARCO_P50_GPIO
tristate "Barco P50 GPIO driver for identify LED/button"
depends on GPIOLIB
+ select GPIOLIB_LEGACY
help
This driver provides access to the GPIOs for the identify button
and led present on Barco P50 board.
diff --git a/drivers/platform/x86/x86-android-tablets/Kconfig b/drivers/platform/x86/x86-android-tablets/Kconfig
index 193da15ee01c..54fa6112c9ea 100644
--- a/drivers/platform/x86/x86-android-tablets/Kconfig
+++ b/drivers/platform/x86/x86-android-tablets/Kconfig
@@ -8,6 +8,7 @@ config X86_ANDROID_TABLETS
depends on I2C && SPI && SERIAL_DEV_BUS
depends on GPIOLIB && PMIC_OPREGION
depends on ACPI && EFI && PCI
+ select GPIOLIB_LEGACY
select NEW_LEDS
select LEDS_CLASS
select POWER_SUPPLY
--
2.39.5On Fri, Aug 08, 2025 at 05:17:49PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > A few old machines have not been converted away from the old-style > gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY > symbol so the code still works where it is needed but can be left > out otherwise. ... > --- a/drivers/platform/x86/x86-android-tablets/Kconfig > +++ b/drivers/platform/x86/x86-android-tablets/Kconfig > @@ -8,6 +8,7 @@ config X86_ANDROID_TABLETS > depends on I2C && SPI && SERIAL_DEV_BUS > depends on GPIOLIB && PMIC_OPREGION > depends on ACPI && EFI && PCI > + select GPIOLIB_LEGACY > select NEW_LEDS > select LEDS_CLASS > select POWER_SUPPLY Hmm... This is a surprising change. But I leave it to Hans. -- With Best Regards, Andy Shevchenko
On Sat, Aug 9, 2025, at 12:00, Andy Shevchenko wrote:
> On Fri, Aug 08, 2025 at 05:17:49PM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@arndb.de>
>>
>> A few old machines have not been converted away from the old-style
>> gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY
>> symbol so the code still works where it is needed but can be left
>> out otherwise.
>
>> --- a/drivers/platform/x86/x86-android-tablets/Kconfig
>> +++ b/drivers/platform/x86/x86-android-tablets/Kconfig
>> @@ -8,6 +8,7 @@ config X86_ANDROID_TABLETS
>> depends on I2C && SPI && SERIAL_DEV_BUS
>> depends on GPIOLIB && PMIC_OPREGION
>> depends on ACPI && EFI && PCI
>> + select GPIOLIB_LEGACY
>> select NEW_LEDS
>> select LEDS_CLASS
>> select POWER_SUPPLY
>
> Hmm... This is a surprising change. But I leave it to Hans.
I think the only function that still needs it is
x86_android_tablet_probe() doing
static struct gpio_keys_button *buttons;
for (i = 0; i < dev_info->gpio_button_count; i++) {
ret = x86_android_tablet_get_gpiod(dev_info->gpio_button[i].chip,
dev_info->gpio_button[i].pin,
dev_info->gpio_button[i].button.desc,
false, GPIOD_IN, &gpiod);
buttons[i] = dev_info->gpio_button[i].button;
buttons[i].gpio = desc_to_gpio(gpiod);
/* Release GPIO descriptor so that gpio-keys can request it */
devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
}
So the driver itself uses gpio descriptors, but it passes
some of them into another driver by number. There is probably
an easy workaround that I did not see.
Arnd
Hi Arnd, Andy,
On 9-Aug-25 9:44 PM, Arnd Bergmann wrote:
> On Sat, Aug 9, 2025, at 12:00, Andy Shevchenko wrote:
>> On Fri, Aug 08, 2025 at 05:17:49PM +0200, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>>
>>> A few old machines have not been converted away from the old-style
>>> gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY
>>> symbol so the code still works where it is needed but can be left
>>> out otherwise.
>>
>>> --- a/drivers/platform/x86/x86-android-tablets/Kconfig
>>> +++ b/drivers/platform/x86/x86-android-tablets/Kconfig
>>> @@ -8,6 +8,7 @@ config X86_ANDROID_TABLETS
>>> depends on I2C && SPI && SERIAL_DEV_BUS
>>> depends on GPIOLIB && PMIC_OPREGION
>>> depends on ACPI && EFI && PCI
>>> + select GPIOLIB_LEGACY
>>> select NEW_LEDS
>>> select LEDS_CLASS
>>> select POWER_SUPPLY
>>
>> Hmm... This is a surprising change. But I leave it to Hans.
Yes I was surprised by this myself since I explicitly removed
all legacy GPIO use from the x86-android-tablets code a while
ago (or so I thought).
> I think the only function that still needs it is
> x86_android_tablet_probe() doing
>
> static struct gpio_keys_button *buttons;
>
> for (i = 0; i < dev_info->gpio_button_count; i++) {
> ret = x86_android_tablet_get_gpiod(dev_info->gpio_button[i].chip,
> dev_info->gpio_button[i].pin,
> dev_info->gpio_button[i].button.desc,
> false, GPIOD_IN, &gpiod);
>
> buttons[i] = dev_info->gpio_button[i].button;
> buttons[i].gpio = desc_to_gpio(gpiod);
> /* Release GPIO descriptor so that gpio-keys can request it */
> devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
> }
>
> So the driver itself uses gpio descriptors, but it passes
> some of them into another driver by number. There is probably
> an easy workaround that I did not see.
Ah I see, so this is basically in the same boat as
drivers/input/misc/soc_button_array.c which also first
gets a gpio_desc and then calls desc_to_gpio() to store
the GPIO number in struct gpio_keys_button which is passed
as platform_data to drivers/input/keyboard/gpio_keys.c
The gpio_keys driver then converts things back
into a gpio_desc in gpio_keys_setup_key()
using devm_gpio_request_one() + gpio_to_desc()
So it looks like we need to add a gpiod member to
struct gpio_keys_button (include/linux/gpio_keys.h)
and modify gpio_keys.c to prefer that over using
button->gpio, something like the attached patch
basically.
I won't have time to work on this until September,
so if someone wants to take the attached patch and run
with it go for it.
Note the x86-android-tablets / soc_button_array code
will become responsible for requesting / releasing
the gpiod when using the new gpio_keys_button.gpiod
member.
For the x86-android-tablets code this is easy, just drop
these 2 lines:
/* Release GPIO descriptor so that gpio-keys can request it */
devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
And for soc_button_array.c it is _probably_ just a matter
of switching to devm_gpiod_get_index() and drop the
gpiod_put().
I have hardware to test both the x86-android-tablets
code as well as the soc_button_array code. I might be
able to do a quick test on August 22nd or 29th.
Regards,
Hans
p.s.
It looks like this will also help with:
drivers/platform/x86/meraki-mx100.c
drivers/platform/x86/pcengines-apuv2.c
drivers/platform/x86/barco-p50-gpio.c
I do not have hardware to test these, but if the changes
work for x86-android-tablets + soc_button_array then
hopefully they will be fine here too.
Hi Hans,
On Sun, Aug 10, 2025 at 05:12:46PM +0200, Hans de Goede wrote:
> Hi Arnd, Andy,
>
> On 9-Aug-25 9:44 PM, Arnd Bergmann wrote:
> > On Sat, Aug 9, 2025, at 12:00, Andy Shevchenko wrote:
> >> On Fri, Aug 08, 2025 at 05:17:49PM +0200, Arnd Bergmann wrote:
> >>> From: Arnd Bergmann <arnd@arndb.de>
> >>>
> >>> A few old machines have not been converted away from the old-style
> >>> gpiolib interfaces. Make these select the new CONFIG_GPIOLIB_LEGACY
> >>> symbol so the code still works where it is needed but can be left
> >>> out otherwise.
> >>
> >>> --- a/drivers/platform/x86/x86-android-tablets/Kconfig
> >>> +++ b/drivers/platform/x86/x86-android-tablets/Kconfig
> >>> @@ -8,6 +8,7 @@ config X86_ANDROID_TABLETS
> >>> depends on I2C && SPI && SERIAL_DEV_BUS
> >>> depends on GPIOLIB && PMIC_OPREGION
> >>> depends on ACPI && EFI && PCI
> >>> + select GPIOLIB_LEGACY
> >>> select NEW_LEDS
> >>> select LEDS_CLASS
> >>> select POWER_SUPPLY
> >>
> >> Hmm... This is a surprising change. But I leave it to Hans.
>
> Yes I was surprised by this myself since I explicitly removed
> all legacy GPIO use from the x86-android-tablets code a while
> ago (or so I thought).
>
> > I think the only function that still needs it is
> > x86_android_tablet_probe() doing
> >
> > static struct gpio_keys_button *buttons;
> >
> > for (i = 0; i < dev_info->gpio_button_count; i++) {
> > ret = x86_android_tablet_get_gpiod(dev_info->gpio_button[i].chip,
> > dev_info->gpio_button[i].pin,
> > dev_info->gpio_button[i].button.desc,
> > false, GPIOD_IN, &gpiod);
> >
> > buttons[i] = dev_info->gpio_button[i].button;
> > buttons[i].gpio = desc_to_gpio(gpiod);
> > /* Release GPIO descriptor so that gpio-keys can request it */
> > devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
> > }
> >
> > So the driver itself uses gpio descriptors, but it passes
> > some of them into another driver by number. There is probably
> > an easy workaround that I did not see.
>
> Ah I see, so this is basically in the same boat as
> drivers/input/misc/soc_button_array.c which also first
> gets a gpio_desc and then calls desc_to_gpio() to store
> the GPIO number in struct gpio_keys_button which is passed
> as platform_data to drivers/input/keyboard/gpio_keys.c
>
> The gpio_keys driver then converts things back
> into a gpio_desc in gpio_keys_setup_key()
> using devm_gpio_request_one() + gpio_to_desc()
>
> So it looks like we need to add a gpiod member to
> struct gpio_keys_button (include/linux/gpio_keys.h)
> and modify gpio_keys.c to prefer that over using
> button->gpio, something like the attached patch
> basically.
>
> I won't have time to work on this until September,
> so if someone wants to take the attached patch and run
> with it go for it.
>
> Note the x86-android-tablets / soc_button_array code
> will become responsible for requesting / releasing
> the gpiod when using the new gpio_keys_button.gpiod
> member.
>
> For the x86-android-tablets code this is easy, just drop
> these 2 lines:
>
> /* Release GPIO descriptor so that gpio-keys can request it */
> devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
>
> And for soc_button_array.c it is _probably_ just a matter
> of switching to devm_gpiod_get_index() and drop the
> gpiod_put().
>
> I have hardware to test both the x86-android-tablets
> code as well as the soc_button_array code. I might be
> able to do a quick test on August 22nd or 29th.
I just sent out a v2 of my series from '23 converting
x86-android-tablets to use PROPERTY_ENTRY_GPIO(), including converting
buttons and switches:
https://lore.kernel.org/all/20250810-x86-andoroid-tablet-v2-0-9c7a1b3c32b2@gmail.com/
I do not have hardware so it probably is busted but if you could make it
work that would be great.
Thanks.
--
Dmitry
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