[PATCH 2/2] misc: add ACPI test driver

[Ahmad Fatoum <ahmad@a3f.at>]

We have a bus driver for ACPI, but no drivers yet. Add a simple (rather
useless) driver that exercises the API, which future drivers can be
based on. As soon as we have proper ACPI drivers, this driver could be
removed again.

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
---
 drivers/misc/Kconfig     |  6 ++++
 drivers/misc/Makefile    |  1 +
 drivers/misc/acpi-test.c | 61 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 drivers/misc/acpi-test.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 0f736f8bded3..b76198b10af5 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -35,4 +35,10 @@ config UBOOTVAR
 	  While it can be used standalone, it is best when coupled
 	  with corresponding filesystem driver.
 
+config ACPI_TEST
+	bool "ACPI Test driver"
+	depends on ACPI
+	help
+	  This is a simple Test driver to test the ACPI bus.
+
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index bc1c01ea4d67..4d92465a1e5e 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_SRAM)		+= sram.o
 obj-$(CONFIG_STATE_DRV)		+= state.o
 obj-$(CONFIG_DEV_MEM)		+= mem.o
 obj-$(CONFIG_UBOOTVAR)		+= ubootvar.o
+obj-$(CONFIG_ACPI_TEST)		+= acpi-test.o
diff --git a/drivers/misc/acpi-test.c b/drivers/misc/acpi-test.c
new file mode 100644
index 000000000000..970b435a0eec
--- /dev/null
+++ b/drivers/misc/acpi-test.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Ahmad Fatoum
+ */
+
+#include <common.h>
+#include <init.h>
+#include <acpi.h>
+
+static const char *profiles[] = {
+	"Unspecified",
+	"Desktop",
+	"Mobile",
+	"Workstation",
+	"Enterprise Server",
+	"SOHO Server",
+	"Applicance PC",
+	"Performance Server",
+	"Tablet",
+};
+
+static int acpi_test_probe(struct device_d *dev)
+{
+	const char *profile = "reserved";
+	u8 *sdt;
+	u8 profileno;
+
+	dev_dbg(dev, "driver initializing...\n");
+
+	sdt = (u8 __force *)dev_request_mem_region_by_name(dev, "SDT");
+	if (IS_ERR(sdt)) {
+		dev_err(dev, "no SDT resource available: %s\n", strerrorp(sdt));
+		return PTR_ERR(sdt);
+	}
+
+	dev_dbg(dev, "SDT is at 0x%p\n", sdt);
+
+	profileno = sdt[45];
+
+	if (profileno < ARRAY_SIZE(profiles))
+		profile = profiles[profileno];
+
+	dev_info(dev, "PM profile is for '%s'\n", profile);
+
+	return 0;
+}
+
+static void acpi_test_remove(struct device_d *dev)
+{
+	dev_info(dev, "FADT driver removed\n");
+}
+
+static struct acpi_driver acpi_test_driver = {
+	.signature = "FACP",
+	.driver = {
+		.name = "acpi-test",
+		.probe = acpi_test_probe,
+		.remove = acpi_test_remove,
+	}
+};
+device_acpi_driver(acpi_test_driver);
-- 
2.20.1


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