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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>
Simon Glass 3 years ago
parent
commit
91c2f9c32e
3 changed files with 43 additions and 0 deletions
  1. 9 0
      include/acpi/acpigen.h
  2. 7 0
      lib/acpi/acpigen.c
  3. 27 0
      test/dm/acpigen.c

+ 9 - 0
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
  *

+ 7 - 0
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) } */

+ 27 - 0
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);