From: Simon Glass <sjg@chromium.org>
Date: Wed, 8 Jul 2020 03:32:14 +0000 (-0600)
Subject: acpi: Support generation of a device
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=91c2f9c32ed76269b9786a6c506233e9b91bdfce;p=u-boot.git

acpi: Support generation of a device

Allow writing an ACPI device to the generated ACPI code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
[bmeng: Fix build failures on Sandbox]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
---

diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index 1f37c9c31c..59d7c2ff6f 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -56,6 +56,7 @@ enum {
 	AND_OP			= 0x7b,
 	OR_OP			= 0x7d,
 	NOT_OP			= 0x80,
+	DEVICE_OP		= 0x82,
 	POWER_RES_OP		= 0x84,
 	RETURN_OP		= 0xa4,
 };
@@ -313,6 +314,14 @@ void acpigen_write_method(struct acpi_ctx *ctx, const char *name, int nargs);
 void acpigen_write_method_serialized(struct acpi_ctx *ctx, const char *name,
 				     int nargs);
 
+/**
+ * acpigen_write_device() - Write an ACPI device
+ *
+ * @ctx: ACPI context pointer
+ * @name: Device name to write
+ */
+void acpigen_write_device(struct acpi_ctx *ctx, const char *name);
+
 /**
  * acpigen_write_sta() - Write a _STA method
  *
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index 45691b7961..a66601a138 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -291,6 +291,13 @@ void acpigen_write_method_serialized(struct acpi_ctx *ctx, const char *name,
 				      ACPI_METHOD_SERIALIZED_MASK);
 }
 
+void acpigen_write_device(struct acpi_ctx *ctx, const char *name)
+{
+	acpigen_emit_ext_op(ctx, DEVICE_OP);
+	acpigen_write_len_f(ctx);
+	acpigen_emit_namestring(ctx, name);
+}
+
 void acpigen_write_sta(struct acpi_ctx *ctx, uint status)
 {
 	/* Method (_STA, 0, NotSerialized) { Return (status) } */
diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c
index 822641afb0..cea1a62b95 100644
--- a/test/dm/acpigen.c
+++ b/test/dm/acpigen.c
@@ -993,3 +993,30 @@ static int dm_test_acpi_resource_template(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_acpi_resource_template, 0);
+
+/* Test writing a device */
+static int dm_test_acpi_device(struct unit_test_state *uts)
+{
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+
+	ut_assertok(alloc_context(&ctx));
+	ptr = acpigen_get_current(ctx);
+
+	acpigen_write_device(ctx, "\\_SB." ACPI_TEST_DEV_NAME);
+	acpigen_pop_len(ctx);
+
+	ut_asserteq(EXT_OP_PREFIX, *ptr++);
+	ut_asserteq(DEVICE_OP, *ptr++);
+	ut_asserteq(0xd, acpi_test_get_length(ptr));
+	ptr += 3;
+	ut_asserteq(ROOT_PREFIX, *ptr++);
+	ut_asserteq(DUAL_NAME_PREFIX, *ptr++);
+	ptr += 8;
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_device, 0);