[PATCH v2 1/2] ACPI: utils: Add acpi_reduced_hardware() helper

[PATCH v2 1/2] ACPI: utils: Add acpi_reduced_hardware() helper

[Hans de Goede]

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@redhat.com>
---
Changes in v2:
- Use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL
---
 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..b20774c48c74 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_GPL(acpi_reduced_hardware);
+
 /*
  * 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

Re: [PATCH v2 1/2] ACPI: utils: Add acpi_reduced_hardware() helper

[Rafael J. Wysocki]

On Wed, Apr 7, 2021 at 7:58 PM Hans de Goede <hdegoede@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@redhat.com>
> ---
> Changes in v2:
> - Use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL
> ---
>  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..b20774c48c74 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_GPL(acpi_reduced_hardware);
> +
>  /*
>   * 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)
> --

Applied along with the [2/2] as 5.13 material, thanks!