acpi: Support writing a name

ACPI supports storing names which are made up of multiple path components.
Several special cases are supported. Add a function to emit a name.

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>

2 files changed, 42 insertions, 0 deletions

diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index 14b96203a9..24aec7fad6 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -21,12 +21,15 @@ struct acpi_ctx;
 enum {
 	ZERO_OP			= 0x00,
 	ONE_OP			= 0x01,
+	NAME_OP			= 0x08,
 	BYTE_PREFIX		= 0x0a,
 	WORD_PREFIX		= 0x0b,
 	DWORD_PREFIX		= 0x0c,
 	STRING_PREFIX		= 0x0d,
 	QWORD_PREFIX		= 0x0e,
 	PACKAGE_OP		= 0x12,
+	DUAL_NAME_PREFIX	= 0x2e,
+	MULTI_NAME_PREFIX	= 0x2f,
 };
 
 /**
@@ -165,4 +168,26 @@ void acpigen_write_integer(struct acpi_ctx *ctx, u64 data);
  * @str: String to write
  */
 void acpigen_write_string(struct acpi_ctx *ctx, const char *str);
+
+/**
+ * acpigen_emit_namestring() - Emit an ACPI name
+ *
+ * This writes out an ACPI name or path in the required special format. It does
+ * not add the NAME_OP prefix.
+ *
+ * @ctx: ACPI context pointer
+ * @namepath: Name / path to emit
+ */
+void acpigen_emit_namestring(struct acpi_ctx *ctx, const char *namepath);
+
+/**
+ * acpigen_write_name() - Write out an ACPI name
+ *
+ * This writes out an ACPI name or path in the required special format with a
+ * NAME_OP prefix.
+ *
+ * @ctx: ACPI context pointer
+ * @namepath: Name / path to emit
+ */
+void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath);
 #endif
diff --git a/include/test/ut.h b/include/test/ut.h
index 7ddd6e8872..99bbb1230c 100644
--- a/include/test/ut.h
+++ b/include/test/ut.h
@@ -134,6 +134,23 @@ int ut_check_console_dump(struct unit_test_state *uts, int total_bytes);
 	}								\
 }
 
+/*
+ * Assert that two string expressions are equal, up to length of the
+ * first
+ */
+#define ut_asserteq_strn(expr1, expr2) {				\
+	const char *_val1 = (expr1), *_val2 = (expr2);			\
+	int _len = strlen(_val1);					\
+									\
+	if (memcmp(_val1, _val2, _len)) {				\
+		ut_failf(uts, __FILE__, __LINE__, __func__,		\
+			 #expr1 " = " #expr2,				\
+			 "Expected \"%.*s\", got \"%.*s\"",		\
+			 _len, _val1, _len, _val2);			\
+		return CMD_RET_FAILURE;					\
+	}								\
+}
+
 /* Assert that two memory areas are equal */
 #define ut_asserteq_mem(expr1, expr2, len) {				\
 	const u8 *_val1 = (u8 *)(expr1), *_val2 = (u8 *)(expr2);	\