arch/x86/acpi: Add acpi_device_hid
Allow a driver to return device specific _HID, which will be consumed by
acpigen in order to generate proper SSDTs.
Change-Id: Ibb79eb00c008a3c3cdc12ad2a48b88a055a9216f
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35006
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/arch/x86/acpi_device.c b/src/arch/x86/acpi_device.c
index 47bcc52..57f0649 100644
--- a/src/arch/x86/acpi_device.c
+++ b/src/arch/x86/acpi_device.c
@@ -81,6 +81,24 @@
return NULL;
}
+/* Locate and return the ACPI _HID (Hardware ID) for this device */
+const char *acpi_device_hid(const struct device *dev)
+{
+ if (!dev)
+ return NULL;
+
+ /* Check for device specific handler */
+ if (dev->ops->acpi_hid)
+ return dev->ops->acpi_hid(dev);
+
+ /*
+ * Don't walk up the tree to find any parent that can identify this device, as
+ * PNP devices are hard to identify.
+ */
+
+ return NULL;
+}
+
/* Recursive function to find the root device and print a path from there */
static ssize_t acpi_device_path_fill(const struct device *dev, char *buf,
size_t buf_len, size_t cur)
diff --git a/src/arch/x86/include/arch/acpi_device.h b/src/arch/x86/include/arch/acpi_device.h
index d74af9d..4990df0 100644
--- a/src/arch/x86/include/arch/acpi_device.h
+++ b/src/arch/x86/include/arch/acpi_device.h
@@ -63,6 +63,7 @@
struct device;
const char *acpi_device_name(const struct device *dev);
+const char *acpi_device_hid(const struct device *dev);
const char *acpi_device_path(const struct device *dev);
const char *acpi_device_scope(const struct device *dev);
const char *acpi_device_path_join(const struct device *dev, const char *name);
diff --git a/src/include/device/device.h b/src/include/device/device.h
index ebf8314..b2221cc 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -62,6 +62,8 @@
void (*acpi_fill_ssdt_generator)(struct device *dev);
void (*acpi_inject_dsdt_generator)(struct device *dev);
const char *(*acpi_name)(const struct device *dev);
+ /* Returns the optional _HID (Hardware ID) */
+ const char *(*acpi_hid)(const struct device *dev);
#endif
const struct pci_operations *ops_pci;
const struct i2c_bus_operations *ops_i2c_bus;