[PATCH 6/6] Add MSI Wind WMI support

[Maxim Mikityanskiy <maxtram95@gmail.com>]

Create a driver to support WMI found on MSI Wind laptops. This driver
allows us to receive some additional keycodes for keys that are not
handled without this driver.

Signed-off-by: Maxim Mikityanskiy <maxtram95@gmail.com>
---
 drivers/platform/x86/Kconfig        |  13 +++
 drivers/platform/x86/Makefile       |   1 +
 drivers/platform/x86/msi-wind-wmi.c | 169 ++++++++++++++++++++++++++++++++++++
 3 files changed, 183 insertions(+)
 create mode 100644 drivers/platform/x86/msi-wind-wmi.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index c86bae8..46f269e5 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -561,6 +561,19 @@ config MSI_WMI
 	 To compile this driver as a module, choose M here: the module will
 	 be called msi-wmi.
 
+config MSI_WIND_WMI
+	tristate "MSI Wind WMI Driver"
+	depends on ACPI_WMI
+	depends on INPUT
+	select INPUT_SPARSEKMAP
+	---help---
+	 Say Y here if you want to support WMI-based hotkeys on MSI Wind
+	 laptops. MSI Wind WMI differs from WMI found on other MSI laptops, so
+	 say Y here if you have MSI Wind, otherwise select "MSI WMI extras".
+
+	 To compile this driver as a module, choose M here: the module will
+	 be called msi-wind-wmi.
+
 config TOPSTAR_LAPTOP
 	tristate "Topstar Laptop Extras"
 	depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index bf7e4f9..44389c0 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_INTEL_MENLOW)	+= intel_menlow.o
 obj-$(CONFIG_ACPI_WMI)		+= wmi.o
 obj-$(CONFIG_MSI_WMI)		+= msi-wmi.o
 obj-$(CONFIG_TOPSTAR_LAPTOP)	+= topstar-laptop.o
+obj-$(CONFIG_MSI_WIND_WMI)	+= msi-wind-wmi.o
 
 # toshiba_acpi must link after wmi to ensure that wmi devices are found
 # before toshiba_acpi initializes
diff --git a/drivers/platform/x86/msi-wind-wmi.c b/drivers/platform/x86/msi-wind-wmi.c
new file mode 100644
index 0000000..4f19434
--- /dev/null
+++ b/drivers/platform/x86/msi-wind-wmi.c
@@ -0,0 +1,169 @@
+/*
+ * MSI Wind WMI hotkeys
+ *
+ * Copyright (C) 2012 Maxim Mikityanskiy <maxtram95@gmail.com>
+ *
+ *  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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/acpi.h>
+
+MODULE_AUTHOR("Maxim Mikityanskiy <maxtram95@gmail.com>");
+MODULE_DESCRIPTION("MSI Wind laptop WMI hotkeys driver");
+MODULE_LICENSE("GPL");
+
+#define WMI_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
+
+MODULE_ALIAS("wmi:" WMI_EVENT_GUID);
+
+/* Fn+F3 touchpad toggle */
+#define WIND_KEY_TOUCHPAD	0x08
+/* Fn+F11 Bluetooth toggle */
+#define WIND_KEY_BLUETOOTH	0x56
+/* Fn+F6 webcam toggle */
+#define WIND_KEY_CAMERA		0x57
+/* Fn+F11 Wi-Fi toggle */
+#define WIND_KEY_WLAN		0x5f
+/* Fn+F10 turbo mode toggle */
+#define WIND_KEY_TURBO		0x60
+/* Fn+F10 ECO mode toggle */
+#define WIND_KEY_ECO		0x69
+
+static struct key_entry wind_keymap[] = {
+	/* These keys work without WMI. Ignore them to avoid double keycodes */
+	{ KE_IGNORE, WIND_KEY_TOUCHPAD,		{ KEY_TOUCHPAD_TOGGLE } },
+	{ KE_IGNORE, WIND_KEY_BLUETOOTH,	{ KEY_BLUETOOTH } },
+	{ KE_IGNORE, WIND_KEY_CAMERA,		{ KEY_CAMERA } },
+	{ KE_IGNORE, WIND_KEY_WLAN,		{ KEY_WLAN } },
+	/* These are keys that should be handled via WMI */
+	{ KE_KEY,    WIND_KEY_TURBO,		{ KEY_PROG1 } },
+	{ KE_KEY,    WIND_KEY_ECO,		{ KEY_PROG2 } },
+	{ KE_END, 0 }
+};
+
+static struct input_dev *wind_input_dev;
+
+static void wind_wmi_notify(u32 value, void *context)
+{
+	struct acpi_buffer response = {
+		.length		= ACPI_ALLOCATE_BUFFER,
+		.pointer	= NULL
+	};
+	acpi_status status = wmi_get_event_data(value, &response);
+	union acpi_object *obj = response.pointer;
+	int code;
+
+	if (status != AE_OK) {
+		pr_warn("Bad event status %#x\n", status);
+		return;
+	}
+
+	if (!obj || obj->type != ACPI_TYPE_INTEGER) {
+		pr_warn("Unknown event received\n");
+		goto wind_wmi_notify_free;
+	}
+
+	code = obj->integer.value;
+	pr_debug("Event code: %#x\n", code);
+
+	if (code == 0x00 || code == 0x62 || code == 0x63) {
+		/* Unknown events - drop them for now */
+		goto wind_wmi_notify_free;
+	}
+
+	if (!sparse_keymap_report_event(wind_input_dev, code, 1, true))
+		pr_warn("Unknown key %#x pressed\n", code);
+
+wind_wmi_notify_free:
+	kfree(response.pointer);
+}
+
+static int __init wind_input_setup(void)
+{
+	int err;
+
+	wind_input_dev = input_allocate_device();
+	if (!wind_input_dev)
+		return -ENOMEM;
+
+	wind_input_dev->name = "MSI WMI hotkeys";
+	wind_input_dev->phys = "wmi/input0";
+	wind_input_dev->id.bustype = BUS_HOST;
+
+	err = sparse_keymap_setup(wind_input_dev, wind_keymap, NULL);
+	if (err)
+		goto wind_input_setup_free_dev;
+
+	err = input_register_device(wind_input_dev);
+	if (err)
+		goto wind_input_setup_free_keymap;
+
+	return 0;
+
+wind_input_setup_free_keymap:
+	sparse_keymap_free(wind_input_dev);
+wind_input_setup_free_dev:
+	input_free_device(wind_input_dev);
+	return err;
+}
+
+static int __init wind_wmi_init(void)
+{
+	int err;
+
+	if (!wmi_has_guid(WMI_EVENT_GUID)) {
+		pr_err("No MSI Wind WMI found\n");
+		return -ENODEV;
+	}
+
+	err = wind_input_setup();
+	if (err) {
+		pr_err("Unable to setup input device\n");
+		return err;
+	}
+
+	if (ACPI_FAILURE(wmi_install_notify_handler(WMI_EVENT_GUID,
+		wind_wmi_notify, NULL))) {
+		pr_err("Unable to install WMI notify handler\n");
+		err = -EIO;
+		goto wind_wmi_init_unregister_input;
+	}
+
+	pr_debug("Event handler installed\n");
+
+	return 0;
+
+wind_wmi_init_unregister_input:
+	input_unregister_device(wind_input_dev);
+	sparse_keymap_free(wind_input_dev);
+	input_free_device(wind_input_dev);
+	return err;
+}
+
+static void __exit wind_wmi_exit(void)
+{
+	wmi_remove_notify_handler(WMI_EVENT_GUID);
+	input_unregister_device(wind_input_dev);
+	sparse_keymap_free(wind_input_dev);
+	input_free_device(wind_input_dev);
+}
+
+module_init(wind_wmi_init);
+module_exit(wind_wmi_exit);
-- 
1.8.0