[PATCH v3 16/35] acpi: Support writing a string

[Simon Glass]

ACPI supports storing a simple nul-terminated string. Add support for
this.

Signed-off-by: Simon Glass <s...@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wall...@br-automation.com>
---

(no changes since v1)

 include/acpi/acpigen.h | 10 ++++++++++
 lib/acpi/acpigen.c     |  6 ++++++
 test/dm/acpigen.c      | 32 ++++++++++++++++++++++++++++++--
 3 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index b17a9ef14c..cf7f6173db 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -24,6 +24,7 @@ enum {
        BYTE_PREFIX             = 0x0a,
        WORD_PREFIX             = 0x0b,
        DWORD_PREFIX            = 0x0c,
+       STRING_PREFIX           = 0x0d,
        QWORD_PREFIX            = 0x0e,
        PACKAGE_OP              = 0x12,
 };
@@ -152,4 +153,13 @@ char *acpigen_write_package(struct acpi_ctx *ctx, int 
nr_el);
  */
 void acpigen_write_integer(struct acpi_ctx *ctx, u64 data);
 
+/**
+ * acpigen_write_string() - Write a string
+ *
+ * This writes a STRING_PREFIX followed by a nul-terminated string
+ *
+ * @ctx: ACPI context pointer
+ * @str: String to write
+ */
+void acpigen_write_string(struct acpi_ctx *ctx, const char *str);
 #endif
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index c8c8f07897..dcf84afbe6 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -146,3 +146,9 @@ void acpigen_emit_string(struct acpi_ctx *ctx, const char 
*str)
        acpigen_emit_stream(ctx, str, str ? strlen(str) : 0);
        acpigen_emit_byte(ctx, '\0'); /* NUL */
 }
+
+void acpigen_write_string(struct acpi_ctx *ctx, const char *str)
+{
+       acpigen_emit_byte(ctx, STRING_PREFIX);
+       acpigen_emit_string(ctx, str);
+}
diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c
index 730f5713ec..836cb4f75c 100644
--- a/test/dm/acpigen.c
+++ b/test/dm/acpigen.c
@@ -20,6 +20,7 @@
 #include <test/ut.h>
 
 #define TEST_STRING    "frogmore"
+#define TEST_STRING2   "ranch"
 #define TEST_STREAM2   "\xfa\xde"
 
 #define TEST_INT8      0x7d
@@ -404,7 +405,7 @@ static int dm_test_acpi_len(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_acpi_len, 0);
 
-/* Test emitting a package */
+/* Test writing a package */
 static int dm_test_acpi_package(struct unit_test_state *uts)
 {
        struct acpi_ctx *ctx;
@@ -431,7 +432,7 @@ static int dm_test_acpi_package(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_acpi_package, 0);
 
-/* Test emitting an integer */
+/* Test writing an integer */
 static int dm_test_acpi_integer(struct unit_test_state *uts)
 {
        struct acpi_ctx *ctx;
@@ -471,3 +472,30 @@ static int dm_test_acpi_integer(struct unit_test_state 
*uts)
        return 0;
 }
 DM_TEST(dm_test_acpi_integer, 0);
+
+/* Test writing a string */
+static int dm_test_acpi_string(struct unit_test_state *uts)
+{
+       struct acpi_ctx *ctx;
+       u8 *ptr;
+
+       ut_assertok(alloc_context(&ctx));
+
+       ptr = acpigen_get_current(ctx);
+
+       acpigen_write_string(ctx, TEST_STRING);
+       acpigen_write_string(ctx, TEST_STRING2);
+
+       ut_asserteq(2 + sizeof(TEST_STRING) + sizeof(TEST_STRING2),
+                   acpigen_get_current(ctx) - ptr);
+       ut_asserteq(STRING_PREFIX, ptr[0]);
+       ut_asserteq_str(TEST_STRING, (char *)ptr + 1);
+       ptr += 1 + sizeof(TEST_STRING);
+       ut_asserteq(STRING_PREFIX, ptr[0]);
+       ut_asserteq_str(TEST_STRING2, (char *)ptr + 1);
+
+       free_context(&ctx);
+
+       return 0;
+}
+DM_TEST(dm_test_acpi_string, 0);
-- 
2.27.0.290.gba653c62da-goog