linux-kernel - Re: [PATCH 2/2] platform/x86: export thinkpad

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Message-ID: <6feeae5a-3928-8198-7ed6-2080c929d7c5@linux.intel.com>
Date: Thu, 8 May 2025 17:03:51 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>
cc: Hans de Goede <hdegoede@...hat.com>, ikepanhc@...il.com, W_Armin@....de, 
    Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
    LKML <linux-kernel@...r.kernel.org>, platform-driver-x86@...r.kernel.org, 
    ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] platform/x86: export thinkpad_acpi handles

On Wed, 7 May 2025, Mark Pearson wrote:

> Add API to be able to get the thinkpad_acpi various handles.
> 
> Will use this to start pulling some of the thinkpad_acpi functionality
> into separate modules in the future.
> 
> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> ---
>  drivers/platform/x86/lenovo/thinkpad_acpi.c | 18 ++++++++++++++++++
>  include/linux/thinkpad_acpi.h               | 17 +++++++++++++++++
>  2 files changed, 35 insertions(+)
>  create mode 100644 include/linux/thinkpad_acpi.h
> 
> diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c
> index 7dd4abf47f61..0eb33b4c99cf 100644
> --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c
> +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c
> @@ -67,6 +67,7 @@
>  #include <linux/string.h>
>  #include <linux/string_helpers.h>
>  #include <linux/sysfs.h>
> +#include <linux/thinkpad_acpi.h>
>  #include <linux/types.h>
>  #include <linux/uaccess.h>
>  #include <linux/units.h>
> @@ -606,6 +607,23 @@ TPACPI_HANDLE(hkey, ec, "\\_SB.HKEY",	/* 600e/x, 770e, 770x */
>   * ACPI helpers
>   */
>  
> +int tp_acpi_get_handle(enum tp_acpi_handle_id handle_id, acpi_handle *handle)
> +{
> +	switch (handle_id) {
> +	case TP_ROOT_HANDLE:
> +		*handle = root_handle;
> +		return 0;
> +	case TP_EC_HANDLE:
> +		*handle = ec_handle;
> +		return 0;
> +	case TP_HKEY_HANDLE:
> +		*handle = hkey_handle;
> +		return 0;
> +	}
> +	return -ENODEV;
> +}
> +EXPORT_SYMBOL_GPL(tp_acpi_get_handle);

Please put these symbols into a namespace.

> +
>  static int acpi_evalf(acpi_handle handle,
>  		      int *res, char *method, char *fmt, ...)
>  {
> diff --git a/include/linux/thinkpad_acpi.h b/include/linux/thinkpad_acpi.h
> new file mode 100644
> index 000000000000..eb5273464658
> --- /dev/null
> +++ b/include/linux/thinkpad_acpi.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Thinkpad ACPI driver API
> + */
> +
> +#ifndef _TP_ACPI_H_
> +#define _TP_ACPI_H_
> +
> +enum tp_acpi_handle_id {
> +	TP_ROOT_HANDLE,
> +	TP_EC_HANDLE,
> +	TP_HKEY_HANDLE,
> +};
> +
> +int tp_acpi_get_handle(enum tp_acpi_handle_id handle_id, acpi_handle *handle);
> +
> +#endif /* _TP_ACPI_H */
> 

I suggest you send this in the series that introduces an user for this 
interface.

-- 
 i.