LoongArch: Add ACPI-based generic laptop driver

This add ACPI-based generic laptop driver for Loongson-3. Some of the
codes are derived from drivers/platform/x86/thinkpad_acpi.c.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

drivers/platform/Kconfig

@@ -3,6 +3,8 @@ if MIPS
 source "drivers/platform/mips/Kconfig"
 endif
 
+source "drivers/platform/loongarch/Kconfig"
+
 source "drivers/platform/goldfish/Kconfig"
 
 source "drivers/platform/chrome/Kconfig"

drivers/platform/Makefile

@@ -4,6 +4,7 @@
 #
 
 obj-$(CONFIG_X86)		+= x86/
+obj-$(CONFIG_LOONGARCH)		+= loongarch/
 obj-$(CONFIG_MELLANOX_PLATFORM)	+= mellanox/
 obj-$(CONFIG_MIPS)		+= mips/
 obj-$(CONFIG_OLPC_EC)		+= olpc/

drivers/platform/loongarch/Kconfig

@@ -0,0 +1,31 @@
+#
+# LoongArch Platform Specific Drivers
+#
+
+menuconfig LOONGARCH_PLATFORM_DEVICES
+	bool "LoongArch Platform Specific Device Drivers"
+	default y
+	depends on LOONGARCH
+	help
+	  Say Y here to get to see options for device drivers of various
+	  LoongArch platforms, including vendor-specific laptop/desktop
+	  extension and hardware monitor drivers. This option itself does
+	  not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if LOONGARCH_PLATFORM_DEVICES
+
+config LOONGSON_LAPTOP
+	tristate "Generic Loongson-3 Laptop Driver"
+	depends on ACPI
+	depends on BACKLIGHT_CLASS_DEVICE
+	depends on INPUT
+	depends on MACH_LOONGSON64
+	select ACPI_VIDEO
+	select INPUT_SPARSEKMAP
+	default y
+	help
+	  ACPI-based Loongson-3 family laptops generic driver.
+
+endif # LOONGARCH_PLATFORM_DEVICES

drivers/platform/loongarch/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_LOONGSON_LAPTOP) += loongson-laptop.o