[Intel-gfx] [PATCH 1/2] ACPI: utils: Add acpi_reduced_hardware() helper

[Rafael J. Wysocki]

On Tue, Apr 6, 2021 at 11:17 PM Hans de Goede <hdegoede at redhat.com> wrote:
>
> Add a getter for the acpi_gbl_reduced_hardware variable so that modules
> can check if they are running on an ACPI reduced-hw platform or not.
>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> ---
>  drivers/acpi/utils.c    | 11 +++++++++++
>  include/acpi/acpi_bus.h |  1 +
>  include/linux/acpi.h    |  5 +++++
>  3 files changed, 17 insertions(+)
>
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 682edd913b3b..4cb061d3169a 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -872,6 +872,17 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
>  }
>  EXPORT_SYMBOL(acpi_dev_get_first_match_dev);
>
> +/**
> + * acpi_reduced_hardware - Return if this is an ACPI-reduced-hw machine
> + *
> + * Return true when running on an ACPI-reduced-hw machine, false otherwise.
> + */
> +bool acpi_reduced_hardware(void)
> +{
> +       return acpi_gbl_reduced_hardware;
> +}
> +EXPORT_SYMBOL(acpi_reduced_hardware);

EXPORT_SYMBOL_GPL()?

> +
>  /*
>   * acpi_backlight= handling, this is done here rather then in video_detect.c
>   * because __setup cannot be used in modules.
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index f28b097c658f..d631cb52283e 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -78,6 +78,7 @@ acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
>
>  bool acpi_dev_found(const char *hid);
>  bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
> +bool acpi_reduced_hardware(void);
>
>  #ifdef CONFIG_ACPI
>
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 3bdcfc4401b7..e2e6db8313c8 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -748,6 +748,11 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
>         return NULL;
>  }
>
> +static inline bool acpi_reduced_hardware(void)
> +{
> +       return false;
> +}
> +
>  static inline void acpi_dev_put(struct acpi_device *adev) {}
>
>  static inline bool is_acpi_node(const struct fwnode_handle *fwnode)
> --
> 2.30.2
>