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acpi: Add a way to check device status

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At present U-Boot does not support the different ACPI status values, but
it is best to put this logic in a central place. Add a function to get the
device status.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-07 13:11:40 -06:00 committed by Bin Meng
parent 1361a53c1a
commit 2715b3623c
3 changed files with 45 additions and 0 deletions
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28
include/acpi/acpi_device.h
View File

@ -9,11 +9,28 @@
#ifndef __ACPI_DEVICE_H
#define __ACPI_DEVICE_H
#include <linux/bitops.h>
struct udevice;
/* Length of a full path to an ACPI device */
#define ACPI_PATH_MAX 30
/* Values that can be returned for ACPI device _STA method */
enum acpi_dev_status {
ACPI_DSTATUS_PRESENT = BIT(0),
ACPI_DSTATUS_ENABLED = BIT(1),
ACPI_DSTATUS_SHOW_IN_UI = BIT(2),
ACPI_DSTATUS_OK = BIT(3),
ACPI_DSTATUS_HAS_BATTERY = BIT(4),
ACPI_DSTATUS_ALL_OFF = 0,
ACPI_DSTATUS_HIDDEN_ON = ACPI_DSTATUS_PRESENT | ACPI_DSTATUS_ENABLED |
ACPI_DSTATUS_OK,
ACPI_DSTATUS_ALL_ON = ACPI_DSTATUS_HIDDEN_ON |
ACPI_DSTATUS_SHOW_IN_UI,
};
/**
* acpi_device_path() - Get the full path to an ACPI device
*
@ -41,4 +58,15 @@ int acpi_device_path(const struct udevice *dev, char *buf, int maxlen);
*/
int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen);
/**
* acpi_device_status() - Get the status of a device
*
* This currently just returns ACPI_DSTATUS_ALL_ON. It does not support
* inactive or hidden devices.
*
* @dev: Device to check
* @return device status, as ACPI_DSTATUS_...
*/
enum acpi_dev_status acpi_device_status(const struct udevice *dev);
#endif

5
lib/acpi/acpi_device.c
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@ -81,3 +81,8 @@ int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen)
return 0;
}
enum acpi_dev_status acpi_device_status(const struct udevice *dev)
{
return ACPI_DSTATUS_ALL_ON;
}

12
test/dm/acpi.c
View File

@ -384,3 +384,15 @@ static int dm_test_acpi_device_path(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_acpi_device_path, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test acpi_device_status() */
static int dm_test_acpi_device_status(struct unit_test_state *uts)
{
struct udevice *dev;
ut_assertok(uclass_first_device_err(UCLASS_TEST_ACPI, &dev));
ut_asserteq(ACPI_DSTATUS_ALL_ON, acpi_device_status(dev));
return 0;
}
DM_TEST(dm_test_acpi_device_status, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);