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ACPI: utils: Add acpi_reduced_hardware() helper 

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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2021-04-07 19:58:20 +02:00 committed by Rafael J. Wysocki
parent e49d033bdd
commit 8eb99e9a64
3 changed files with 17 additions and 0 deletions
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11
drivers/acpi/utils.c
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@ -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); 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 * acpi_backlight= handling, this is done here rather then in video_detect.c
* because __setup cannot be used in modules. * because __setup cannot be used in modules.

1
include/acpi/acpi_bus.h
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@ -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_found(const char *hid);
bool acpi_dev_present(const char *hid, const char *uid, s64 hrv); bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
bool acpi_reduced_hardware(void);
#ifdef CONFIG_ACPI #ifdef CONFIG_ACPI

5
include/linux/acpi.h
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@ -748,6 +748,11 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
return NULL; return NULL;
} }
static inline bool acpi_reduced_hardware(void)
{
return false;
}
static inline void acpi_dev_put(struct acpi_device *adev) {} static inline void acpi_dev_put(struct acpi_device *adev) {}
static inline bool is_acpi_node(const struct fwnode_handle *fwnode) static inline bool is_acpi_node(const struct fwnode_handle *fwnode)