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ACPI: Introduce has_acpi_companion()

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Now that the ACPI companions of devices are represented by pointers
to struct fwnode_handle, it is not quite efficient to check whether
or not an ACPI companion of a device is present by evaluating the
ACPI_COMPANION() macro.

For this reason, introduce a special static inline routine for that,
has_acpi_companion(), and update the code to use it where applicable.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2015-03-16 23:49:08 +01:00
parent ce793486e2
commit ca5b74d267
4 changed files with 15 additions and 5 deletions
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10
include/linux/acpi.h
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@@ -58,6 +58,11 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
acpi_fwnode_handle(adev) : NULL
#define ACPI_HANDLE(dev) acpi_device_handle(ACPI_COMPANION(dev))
static inline bool has_acpi_companion(struct device *dev)
{
return is_acpi_node(dev->fwnode);
}
static inline void acpi_preset_companion(struct device *dev,
struct acpi_device *parent, u64 addr)
{
@@ -472,6 +477,11 @@ static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
return NULL;
}
static inline bool has_acpi_companion(struct device *dev)
{
return false;
}
static inline const char *acpi_dev_name(struct acpi_device *adev)
{
return NULL;