ec/lenovo/h8/acpi: Add BDC interface

* Add SSDT generator to add dynamic ACPI code.
* Implement GBDC and SBDC for thinkpad_acpi kernel module.
Required for BDC power control from userspace.

Tested on Lenovo T430:
The bluetooth module is detected and can be powercycled using network manager.

Change-Id: Ida825196650966194a883945896a038b0790fe45
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20985
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/ec/lenovo/h8/ssdt.c b/src/ec/lenovo/h8/ssdt.c
new file mode 100644
index 0000000000..35570b0b72
--- /dev/null
+++ b/src/ec/lenovo/h8/ssdt.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <arch/acpigen.h>
+#include <string.h>
+
+#include "h8.h"
+#include "chip.h"
+
+static char *h8_dsdt_scope(struct device *dev, const char *scope)
+{
+	static char buf[DEVICE_PATH_MAX] = {};
+	const char *path = acpi_device_path(dev);
+
+	memset(buf, 0, sizeof(buf));
+	snprintf(buf, sizeof(buf) - 1, "%s.%s", path, scope);
+
+	return buf;
+}
+
+/*
+ * Generates EC SSDT.
+ */
+void h8_ssdt_generator(struct device *dev)
+{
+	if (!acpi_device_path(dev))
+		return;
+
+	printk(BIOS_INFO, "ACPI:    * H8\n");
+
+	/* Scope HKEY */
+	acpigen_write_scope(h8_dsdt_scope(dev, "HKEY"));
+
+	/* Used by thinkpad_acpi */
+	acpigen_write_name_byte("HBDC", h8_has_bdc(dev) ? ONE_OP : ZERO_OP);
+
+	acpigen_pop_len(); /* Scope HKEY */
+}