acpi: Support generating a multi-function _DSM for devices
Add a function to generate ACPI code for a _DSM method for a device.
This includes functions for starting and ending each part of the _DSM.
Signed-off-by: Simon Glass <sjg@chromium.org>
[bmeng: fix the "new blank line at EOF" git warning]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index 2518bf8..d859f37 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -609,6 +609,60 @@
acpigen_write_byte(ctx, arg);
}
+void acpigen_write_dsm_start(struct acpi_ctx *ctx)
+{
+ /* Method (_DSM, 4, Serialized) */
+ acpigen_write_method_serialized(ctx, "_DSM", 4);
+
+ /* ToBuffer (Arg0, Local0) */
+ acpigen_write_to_buffer(ctx, ARG0_OP, LOCAL0_OP);
+}
+
+int acpigen_write_dsm_uuid_start(struct acpi_ctx *ctx, const char *uuid)
+{
+ int ret;
+
+ /* If (LEqual (Local0, ToUUID(uuid))) */
+ acpigen_write_if(ctx);
+ acpigen_emit_byte(ctx, LEQUAL_OP);
+ acpigen_emit_byte(ctx, LOCAL0_OP);
+ ret = acpigen_write_uuid(ctx, uuid);
+ if (ret)
+ return log_msg_ret("uuid", ret);
+
+ /* ToInteger (Arg2, Local1) */
+ acpigen_write_to_integer(ctx, ARG2_OP, LOCAL1_OP);
+
+ return 0;
+}
+
+void acpigen_write_dsm_uuid_start_cond(struct acpi_ctx *ctx, int seq)
+{
+ /* If (LEqual (Local1, i)) */
+ acpigen_write_if_lequal_op_int(ctx, LOCAL1_OP, seq);
+}
+
+void acpigen_write_dsm_uuid_end_cond(struct acpi_ctx *ctx)
+{
+ acpigen_pop_len(ctx); /* If */
+}
+
+void acpigen_write_dsm_uuid_end(struct acpi_ctx *ctx)
+{
+ /* Default case: Return (Buffer (One) { 0x0 }) */
+ acpigen_write_return_singleton_buffer(ctx, 0x0);
+
+ acpigen_pop_len(ctx); /* If (LEqual (Local0, ToUUID(uuid))) */
+}
+
+void acpigen_write_dsm_end(struct acpi_ctx *ctx)
+{
+ /* Return (Buffer (One) { 0x0 }) */
+ acpigen_write_return_singleton_buffer(ctx, 0x0);
+
+ acpigen_pop_len(ctx); /* Method _DSM */
+}
+
/**
* acpigen_get_dw0_in_local5() - Generate code to put dw0 cfg0 in local5
*