Re: [PATCH v3 1/6] platform/x86: ayaneo-ec: Add Ayaneo Embedded Controller platform driver

[Armin Wolf <W_Armin@gmx.de>]

Am 31.10.25 um 17:36 schrieb Antheas Kapenekakis:

> Recent Ayaneo devices feature an ACPI mapped Embedded Controller (EC)
> with standard addresses across models that provides access to fan
> speed, fan control, battery charge limits, and controller power
> controls. Introduce a new driver stub that will handle these driver
> features.
>
> Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
> ---
>   MAINTAINERS                      |  6 +++
>   drivers/platform/x86/Kconfig     |  9 ++++
>   drivers/platform/x86/Makefile    |  3 ++
>   drivers/platform/x86/ayaneo-ec.c | 90 ++++++++++++++++++++++++++++++++
>   4 files changed, 108 insertions(+)
>   create mode 100644 drivers/platform/x86/ayaneo-ec.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 545a4776795e..da9498d8cc89 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4187,6 +4187,12 @@ W:	https://ez.analog.com/linux-software-drivers
>   F:	Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml
>   F:	drivers/pwm/pwm-axi-pwmgen.c
>   
> +AYANEO PLATFORM EC DRIVER
> +M:	Antheas Kapenekakis <lkml@antheas.dev>
> +L:	platform-driver-x86@vger.kernel.org
> +S:	Maintained
> +F:	drivers/platform/x86/ayaneo-ec.c
> +
>   AZ6007 DVB DRIVER
>   M:	Mauro Carvalho Chehab <mchehab@kernel.org>
>   L:	linux-media@vger.kernel.org
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 46e62feeda3c..ebe7d2ab8758 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -316,6 +316,15 @@ config ASUS_TF103C_DOCK
>   	  If you have an Asus TF103C tablet say Y or M here, for a generic x86
>   	  distro config say M here.
>   
> +config AYANEO_EC
> +	tristate "Ayaneo EC platform control"
> +	help
> +	  Enables support for the platform EC of Ayaneo devices. This
> +	  includes fan control, fan speed, charge limit, magic
> +	  module detection, and controller power control.
> +
> +	  If you have an Ayaneo device, say Y or M here.
> +
>   config MERAKI_MX100
>   	tristate "Cisco Meraki MX100 Platform Driver"
>   	depends on GPIOLIB
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index c7db2a88c11a..274a685eb92d 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -39,6 +39,9 @@ obj-$(CONFIG_ASUS_TF103C_DOCK)	+= asus-tf103c-dock.o
>   obj-$(CONFIG_EEEPC_LAPTOP)	+= eeepc-laptop.o
>   obj-$(CONFIG_EEEPC_WMI)		+= eeepc-wmi.o
>   
> +# Ayaneo
> +obj-$(CONFIG_AYANEO_EC)		+= ayaneo-ec.o
> +
>   # Cisco/Meraki
>   obj-$(CONFIG_MERAKI_MX100)	+= meraki-mx100.o
>   
> diff --git a/drivers/platform/x86/ayaneo-ec.c b/drivers/platform/x86/ayaneo-ec.c
> new file mode 100644
> index 000000000000..2fe66c8a89f4
> --- /dev/null
> +++ b/drivers/platform/x86/ayaneo-ec.c
> @@ -0,0 +1,90 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Platform driver for the Embedded Controller (EC) of Ayaneo devices. Handles
> + * hwmon (fan speed, fan control), battery charge limits, and magic module
> + * control (connected modules, controller disconnection).
> + *
> + * Copyright (C) 2025 Antheas Kapenekakis <lkml@antheas.dev>
> + */
> +
> +#include <linux/dmi.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +struct ayaneo_ec_quirk {
> +};
> +
> +struct ayaneo_ec_platform_data {
> +	struct platform_device *pdev;
> +	struct ayaneo_ec_quirk *quirks;
> +};
> +
> +static const struct ayaneo_ec_quirk quirk_ayaneo3 = {
> +};
> +
> +static const struct dmi_system_id dmi_table[] = {
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
> +			DMI_EXACT_MATCH(DMI_BOARD_NAME, "AYANEO 3"),
> +		},
> +		.driver_data = (void *)&quirk_ayaneo3,
> +	},
> +	{},
> +};

MODULE_DEVICE_TABLE() is missing, please add it so that the driver will
automatically load on supported devices.

> +
> +static int ayaneo_ec_probe(struct platform_device *pdev)
> +{
> +	const struct dmi_system_id *dmi_entry;
> +	struct ayaneo_ec_platform_data *data;
> +
> +	dmi_entry = dmi_first_match(dmi_table);
> +	if (!dmi_entry)
> +		return -ENODEV;

Please store the quirk inside a global variable and perform the DMI match
inside ayaneo_ec_init. This will allow you to mark the DMI table as __initconst.

Thanks,
Armin Wolf

> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->pdev = pdev;
> +	data->quirks = dmi_entry->driver_data;
> +	platform_set_drvdata(pdev, data);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver ayaneo_platform_driver = {
> +	.driver = {
> +		.name = "ayaneo-ec",
> +	},
> +	.probe = ayaneo_ec_probe,
> +};
> +
> +static struct platform_device *ayaneo_platform_device;
> +
> +static int __init ayaneo_ec_init(void)
> +{
> +	ayaneo_platform_device =
> +		platform_create_bundle(&ayaneo_platform_driver,
> +				       ayaneo_ec_probe, NULL, 0, NULL, 0);
> +
> +	return PTR_ERR_OR_ZERO(ayaneo_platform_device);
> +}
> +
> +static void __exit ayaneo_ec_exit(void)
> +{
> +	platform_device_unregister(ayaneo_platform_device);
> +	platform_driver_unregister(&ayaneo_platform_driver);
> +}
> +
> +MODULE_DEVICE_TABLE(dmi, dmi_table);
> +
> +module_init(ayaneo_ec_init);
> +module_exit(ayaneo_ec_exit);
> +
> +MODULE_AUTHOR("Antheas Kapenekakis <lkml@antheas.dev>");
> +MODULE_DESCRIPTION("Ayaneo Embedded Controller (EC) platform features");
> +MODULE_LICENSE("GPL");