1 files changed, 413 insertions, 0 deletions
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
new file mode 100644
index 000000000000..b227eb469f49
--- /dev/null
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -0,0 +1,413 @@
+/*
+ * Eee PC WMI hotkey driver
+ *
+ * Copyright(C) 2010 Intel Corporation.
+ *
+ * Portions based on wistron_btns.c:
+ * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
+ * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
+ * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
+ *
+ *  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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/platform_device.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+#define	EEEPC_WMI_FILE	"eeepc-wmi"
+
+MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
+MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
+MODULE_LICENSE("GPL");
+
+#define EEEPC_WMI_EVENT_GUID	"ABBC0F72-8EA1-11D1-00A0-C90629100000"
+#define EEEPC_WMI_MGMT_GUID	"97845ED0-4E6D-11DE-8A39-0800200C9A66"
+
+MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
+MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
+
+#define NOTIFY_BRNUP_MIN	0x11
+#define NOTIFY_BRNUP_MAX	0x1f
+#define NOTIFY_BRNDOWN_MIN	0x20
+#define NOTIFY_BRNDOWN_MAX	0x2e
+
+#define EEEPC_WMI_METHODID_DEVS	0x53564544
+#define EEEPC_WMI_METHODID_DSTS	0x53544344
+
+#define EEEPC_WMI_DEVID_BACKLIGHT	0x00050012
+
+static const struct key_entry eeepc_wmi_keymap[] = {
+	/* Sleep already handled via generic ACPI code */
+	{ KE_KEY, 0x5d, { KEY_WLAN } },
+	{ KE_KEY, 0x32, { KEY_MUTE } },
+	{ KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
+	{ KE_KEY, 0x30, { KEY_VOLUMEUP } },
+	{ KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
+	{ KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
+	{ KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
+	{ KE_END, 0},
+};
+
+struct bios_args {
+	u32	dev_id;
+	u32	ctrl_param;
+};
+
+struct eeepc_wmi {
+	struct input_dev *inputdev;
+	struct backlight_device *backlight_device;
+};
+
+static struct platform_device *platform_device;
+
+static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
+{
+	int err;
+
+	eeepc->inputdev = input_allocate_device();
+	if (!eeepc->inputdev)
+		return -ENOMEM;
+
+	eeepc->inputdev->name = "Eee PC WMI hotkeys";
+	eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
+	eeepc->inputdev->id.bustype = BUS_HOST;
+	eeepc->inputdev->dev.parent = &platform_device->dev;
+
+	err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
+	if (err)
+		goto err_free_dev;
+
+	err = input_register_device(eeepc->inputdev);
+	if (err)
+		goto err_free_keymap;
+
+	return 0;
+
+err_free_keymap:
+	sparse_keymap_free(eeepc->inputdev);
+err_free_dev:
+	input_free_device(eeepc->inputdev);
+	return err;
+}
+
+static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
+{
+	if (eeepc->inputdev) {
+		sparse_keymap_free(eeepc->inputdev);
+		input_unregister_device(eeepc->inputdev);
+	}
+
+	eeepc->inputdev = NULL;
+}
+
+static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
+{
+	struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+	u32 tmp;
+
+	status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+			1, EEEPC_WMI_METHODID_DSTS, &input, &output);
+
+	if (ACPI_FAILURE(status))
+		return status;
+
+	obj = (union acpi_object *)output.pointer;
+	if (obj && obj->type == ACPI_TYPE_INTEGER)
+		tmp = (u32)obj->integer.value;
+	else
+		tmp = 0;
+
+	if (ctrl_param)
+		*ctrl_param = tmp;
+
+	kfree(obj);
+
+	return status;
+
+}
+
+static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
+{
+	struct bios_args args = {
+		.dev_id = dev_id,
+		.ctrl_param = ctrl_param,
+	};
+	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+	acpi_status status;
+
+	status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+			1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
+
+	return status;
+}
+
+static int read_brightness(struct backlight_device *bd)
+{
+	static u32 ctrl_param;
+	acpi_status status;
+
+	status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
+
+	if (ACPI_FAILURE(status))
+		return -1;
+	else
+		return ctrl_param & 0xFF;
+}
+
+static int update_bl_status(struct backlight_device *bd)
+{
+
+	static u32 ctrl_param;
+	acpi_status status;
+
+	ctrl_param = bd->props.brightness;
+
+	status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
+
+	if (ACPI_FAILURE(status))
+		return -1;
+	else
+		return 0;
+}
+
+static const struct backlight_ops eeepc_wmi_bl_ops = {
+	.get_brightness = read_brightness,
+	.update_status = update_bl_status,
+};
+
+static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
+{
+	struct backlight_device *bd = eeepc->backlight_device;
+	int old = bd->props.brightness;
+	int new;
+
+	if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
+		new = code - NOTIFY_BRNUP_MIN + 1;
+	else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
+		new = code - NOTIFY_BRNDOWN_MIN;
+
+	bd->props.brightness = new;
+	backlight_update_status(bd);
+	backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
+
+	return old;
+}
+
+static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
+{
+	struct backlight_device *bd;
+	struct backlight_properties props;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = 15;
+	bd = backlight_device_register(EEEPC_WMI_FILE,
+				       &platform_device->dev, eeepc,
+				       &eeepc_wmi_bl_ops, &props);
+	if (IS_ERR(bd)) {
+		pr_err("Could not register backlight device\n");
+		return PTR_ERR(bd);
+	}
+
+	eeepc->backlight_device = bd;
+
+	bd->props.brightness = read_brightness(bd);
+	bd->props.power = FB_BLANK_UNBLANK;
+	backlight_update_status(bd);
+
+	return 0;
+}
+
+static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
+{
+	if (eeepc->backlight_device)
+		backlight_device_unregister(eeepc->backlight_device);
+
+	eeepc->backlight_device = NULL;
+}
+
+static void eeepc_wmi_notify(u32 value, void *context)
+{
+	struct eeepc_wmi *eeepc = context;
+	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+	int code;
+	int orig_code;
+
+	status = wmi_get_event_data(value, &response);
+	if (status != AE_OK) {
+		pr_err("bad event status 0x%x\n", status);
+		return;
+	}
+
+	obj = (union acpi_object *)response.pointer;
+
+	if (obj && obj->type == ACPI_TYPE_INTEGER) {
+		code = obj->integer.value;
+		orig_code = code;
+
+		if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
+			code = NOTIFY_BRNUP_MIN;
+		else if (code >= NOTIFY_BRNDOWN_MIN &&
+			 code <= NOTIFY_BRNDOWN_MAX)
+			code = NOTIFY_BRNDOWN_MIN;
+
+		if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
+			if (!acpi_video_backlight_support())
+				eeepc_wmi_backlight_notify(eeepc, orig_code);
+		}
+
+		if (!sparse_keymap_report_event(eeepc->inputdev,
+						code, 1, true))
+			pr_info("Unknown key %x pressed\n", code);
+	}
+
+	kfree(obj);
+}
+
+static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
+{
+	struct eeepc_wmi *eeepc;
+	int err;
+	acpi_status status;
+
+	eeepc = platform_get_drvdata(device);
+
+	err = eeepc_wmi_input_init(eeepc);
+	if (err)
+		goto error_input;
+
+	if (!acpi_video_backlight_support()) {
+		err = eeepc_wmi_backlight_init(eeepc);
+		if (err)
+			goto error_backlight;
+	} else
+		pr_info("Backlight controlled by ACPI video driver\n");
+
+	status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
+					eeepc_wmi_notify, eeepc);
+	if (ACPI_FAILURE(status)) {
+		pr_err("Unable to register notify handler - %d\n",
+			status);
+		err = -ENODEV;
+		goto error_wmi;
+	}
+
+	return 0;
+
+error_wmi:
+	eeepc_wmi_backlight_exit(eeepc);
+error_backlight:
+	eeepc_wmi_input_exit(eeepc);
+error_input:
+	return err;
+}
+
+static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
+{
+	struct eeepc_wmi *eeepc;
+
+	eeepc = platform_get_drvdata(device);
+	wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
+	eeepc_wmi_backlight_exit(eeepc);
+	eeepc_wmi_input_exit(eeepc);
+
+	return 0;
+}
+
+static struct platform_driver platform_driver = {
+	.driver = {
+		.name = EEEPC_WMI_FILE,
+		.owner = THIS_MODULE,
+	},
+	.probe = eeepc_wmi_platform_probe,
+	.remove = __devexit_p(eeepc_wmi_platform_remove),
+};
+
+static int __init eeepc_wmi_init(void)
+{
+	struct eeepc_wmi *eeepc;
+	int err;
+
+	if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
+	    !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
+		pr_warning("No known WMI GUID found\n");
+		return -ENODEV;
+	}
+
+	eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
+	if (!eeepc)
+		return -ENOMEM;
+
+	platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
+	if (!platform_device) {
+		pr_warning("Unable to allocate platform device\n");
+		err = -ENOMEM;
+		goto fail_platform;
+	}
+
+	err = platform_device_add(platform_device);
+	if (err) {
+		pr_warning("Unable to add platform device\n");
+		goto put_dev;
+	}
+
+	platform_set_drvdata(platform_device, eeepc);
+
+	err = platform_driver_register(&platform_driver);
+	if (err) {
+		pr_warning("Unable to register platform driver\n");
+		goto del_dev;
+	}
+
+	return 0;
+
+del_dev:
+	platform_device_del(platform_device);
+put_dev:
+	platform_device_put(platform_device);
+fail_platform:
+	kfree(eeepc);
+
+	return err;
+}
+
+static void __exit eeepc_wmi_exit(void)
+{
+	struct eeepc_wmi *eeepc;
+
+	eeepc = platform_get_drvdata(platform_device);
+	platform_driver_unregister(&platform_driver);
+	platform_device_unregister(platform_device);
+	kfree(eeepc);
+}
+
+module_init(eeepc_wmi_init);
+module_exit(eeepc_wmi_exit);