acpi: Add a way to check device status

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>

diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h
index 37a675f101d42b01e5bbd7d5cf391b3168967837..09c227489af8dc911e07e4c89b9f190f7b56aedf 100644 (file)
--- a/include/acpi/acpi_device.h
+++ b/include/acpi/acpi_device.h
@@ -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

diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c
index 3a9424e7ee5ad8deaa34eee78f8d069bb1dc4eaf..60f4fd8cd5299c80df6f7440c8f17fb6f636e9ba 100644 (file)
--- a/lib/acpi/acpi_device.c
+++ b/lib/acpi/acpi_device.c
@@ -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;
+}

diff --git a/test/dm/acpi.c b/test/dm/acpi.c
index 5b8459311cb1ac3011ccc93534d60281bb832e64..07b0daaab0d93e1b392d1514210abc9b335a5631 100644 (file)
--- a/test/dm/acpi.c
+++ b/test/dm/acpi.c
@@ -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);