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-rw-r--r--src/acpi/acpigen_dsm.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/acpi/acpigen_dsm.c b/src/acpi/acpigen_dsm.c
new file mode 100644
index 0000000000..ecac3fefb8
--- /dev/null
+++ b/src/acpi/acpigen_dsm.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* This file is part of the coreboot project. */
+
+#include <arch/acpigen.h>
+#include <arch/acpigen_dsm.h>
+
+/* ------------------- I2C HID DSM ---------------------------- */
+
+#define ACPI_DSM_I2C_HID_UUID "3CDFF6F7-4267-4555-AD05-B30A3D8938DE"
+
+static void i2c_hid_func0_cb(void *arg)
+{
+ /* ToInteger (Arg1, Local2) */
+ acpigen_write_to_integer(ARG1_OP, LOCAL2_OP);
+ /* If (LEqual (Local2, 0x0)) */
+ acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x0);
+ /* Return (Buffer (One) { 0x1f }) */
+ acpigen_write_return_singleton_buffer(0x1f);
+ acpigen_pop_len(); /* Pop : If */
+ /* Else */
+ acpigen_write_else();
+ /* If (LEqual (Local2, 0x1)) */
+ acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x1);
+ /* Return (Buffer (One) { 0x3f }) */
+ acpigen_write_return_singleton_buffer(0x3f);
+ acpigen_pop_len(); /* Pop : If */
+ /* Else */
+ acpigen_write_else();
+ /* Return (Buffer (One) { 0x0 }) */
+ acpigen_write_return_singleton_buffer(0x0);
+ acpigen_pop_len(); /* Pop : Else */
+ acpigen_pop_len(); /* Pop : Else */
+}
+
+static void i2c_hid_func1_cb(void *arg)
+{
+ struct dsm_i2c_hid_config *config = arg;
+ acpigen_write_return_byte(config->hid_desc_reg_offset);
+}
+
+static void (*i2c_hid_callbacks[2])(void *) = {
+ i2c_hid_func0_cb,
+ i2c_hid_func1_cb,
+};
+
+void acpigen_write_dsm_i2c_hid(struct dsm_i2c_hid_config *config)
+{
+ acpigen_write_dsm(ACPI_DSM_I2C_HID_UUID, i2c_hid_callbacks,
+ ARRAY_SIZE(i2c_hid_callbacks), config);
+}
+
+/* ------------------- End: I2C HID DSM ------------------------- */