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ACPI: Provide generic functions for matching ACPI device nodes 

Introduce function acpi_match_device() allowing callers to match
struct device objects with populated acpi_handle fields against
arrays of ACPI device IDs.  Also introduce function
acpi_driver_match_device() using acpi_match_device() internally and
allowing callers to match a struct device object against an array of
ACPI device IDs provided by a device driver.

Additionally, introduce macro ACPI_PTR() that may be used by device
drivers to escape pointers to data structures whose definitions
depend on CONFIG_ACPI.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2012-10-31 22:44:41 +01:00 committed by Rafael J. Wysocki
parent 06f64c8f23
commit cf761af9ee
2 changed files with 63 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/acpi/scan.c
View File

@ -340,8 +340,8 @@ static void acpi_device_remove_files(struct acpi_device *dev)
ACPI Bus operations
-------------------------------------------------------------------------- */
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
static const struct acpi_device_id *__acpi_match_device(
struct acpi_device *device, const struct acpi_device_id *ids)
{
const struct acpi_device_id *id;
struct acpi_hardware_id *hwid;
@ -351,14 +351,44 @@ int acpi_match_device_ids(struct acpi_device *device,
* driver for it.
*/
if (!device->status.present)
return -ENODEV;
return NULL;
for (id = ids; id->id[0]; id++)
list_for_each_entry(hwid, &device->pnp.ids, list)
if (!strcmp((char *) id->id, hwid->id))
return 0;
return id;
return -ENOENT;
return NULL;
}
/**
* acpi_match_device - Match a struct device against a given list of ACPI IDs
* @ids: Array of struct acpi_device_id object to match against.
* @dev: The device structure to match.
*
* Check if @dev has a valid ACPI handle and if there is a struct acpi_device
* object for that handle and use that object to match against a given list of
* device IDs.
*
* Return a pointer to the first matching ID on success or %NULL on failure.
*/
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
const struct device *dev)
{
struct acpi_device *adev;
if (!ids || !dev->acpi_handle
|| ACPI_FAILURE(acpi_bus_get_device(dev->acpi_handle, &adev)))
return NULL;
return __acpi_match_device(adev, ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids)
{
return __acpi_match_device(device, ids) ? 0 : -ENOENT;
}
EXPORT_SYMBOL(acpi_match_device_ids);

28
include/linux/acpi.h
View File

@ -26,6 +26,7 @@
#define _LINUX_ACPI_H
#include <linux/ioport.h> /* for struct resource */
#include <linux/device.h>
#ifdef CONFIG_ACPI
@ -364,6 +365,17 @@ extern int acpi_nvs_register(__u64 start, __u64 size);
extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
void *data);
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
const struct device *dev);
static inline bool acpi_driver_match_device(struct device *dev,
const struct device_driver *drv)
{
return !!acpi_match_device(drv->acpi_match_table, dev);
}
#define ACPI_PTR(_ptr) (_ptr)
#else /* !CONFIG_ACPI */
#define acpi_disabled 1
@ -418,6 +430,22 @@ static inline int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
return 0;
}
struct acpi_device_id;
static inline const struct acpi_device_id *acpi_match_device(
const struct acpi_device_id *ids, const struct device *dev)
{
return NULL;
}
static inline bool acpi_driver_match_device(struct device *dev,
const struct device_driver *drv)
{
return false;
}
#define ACPI_PTR(_ptr) (NULL)
#endif /* !CONFIG_ACPI */
#ifdef CONFIG_ACPI