[PATCH v3 11/57] acpi: Add support for writing a _PRW

Simon Glass
2020-09-06T21:43:19Z

A 'Power Resource for Wake' list the resources a device depends on for
wake. Add a function to generate this.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

include/acpi/acpigen.h | 10 ++++++++++
lib/acpi/acpigen.c | 10 ++++++++++
test/dm/acpigen.c | 30 ++++++++++++++++++++++++++++++
3 files changed, 50 insertions(+)

diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index 228ac9c404b..a9b70123c0a 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -563,4 +563,14 @@ int acpigen_set_enable_tx_gpio(struct acpi_ctx *ctx, u32 tx_state_val,
const char *dw0_read, const char *dw0_write,
struct acpi_gpio *gpio, bool enable);

+/**
+ * acpigen_write_prw() - Write a power resource for wake (_PRW)
+ *
+ * @ctx: ACPI context pointer
+ * @wake: GPE that wakes up the device
+ * @level: Deepest power system sleeping state that can be entered while still
+ * providing wake functionality
+ */
+void acpigen_write_prw(struct acpi_ctx *ctx, uint wake, uint level);
+
#endif
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index c609ef4daa4..527de89b1e1 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -426,6 +426,16 @@ void acpigen_write_register_resource(struct acpi_ctx *ctx,
acpigen_write_resourcetemplate_footer(ctx);
}

+void acpigen_write_prw(struct acpi_ctx *ctx, uint wake, uint level)
+{
+ /* Name (_PRW, Package () { wake, level } */
+ acpigen_write_name(ctx, "_PRW");
+ acpigen_write_package(ctx, 2);
+ acpigen_write_integer(ctx, wake);
+ acpigen_write_integer(ctx, level);
+ acpigen_pop_len(ctx);
+}
+
/*
* ToUUID(uuid)
*
diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c
index 1b2767e732d..16ae7025856 100644
--- a/test/dm/acpigen.c
+++ b/test/dm/acpigen.c
@@ -1097,3 +1097,33 @@ static int dm_test_acpi_write_name(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_acpi_write_name, 0);
+
+/* Test emitting a string */
+static int dm_test_acpi_write_prw(struct unit_test_state *uts)
+{
+ struct acpi_ctx *ctx;
+ u8 *ptr;
+
+ ut_assertok(alloc_context(&ctx));
+
+ ptr = acpigen_get_current(ctx);
+ acpigen_write_prw(ctx, 5, 3);
+ ut_asserteq(NAME_OP, *ptr++);
+
+ ut_asserteq_strn("_PRW", (char *)ptr);
+ ptr += 4;
+ ut_asserteq(PACKAGE_OP, *ptr++);
+ ut_asserteq(8, acpi_test_get_length(ptr));
+ ptr += 3;
+ ut_asserteq(2, *ptr++);
+ ut_asserteq(BYTE_PREFIX, *ptr++);
+ ut_asserteq(5, *ptr++);
+ ut_asserteq(BYTE_PREFIX, *ptr++);
+ ut_asserteq(3, *ptr++);
+ ut_asserteq_ptr(ptr, ctx->current);
+
+ free_context(&ctx);
+
+ return 0;
+}
+DM_TEST(dm_test_acpi_write_prw, 0);
--
2.28.0.526.ge36021eeef-goog