[mirror_ubuntu-artful-kernel.git] / drivers / platform / x86 / msi-wmi.c

/*
 * MSI WMI hotkeys
 *
 * Copyright (C) 2009 Novell <trenn@suse.de>
 *
 * Most stuff taken over from hp-wmi
 *
 *  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/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/acpi.h>
#include <linux/backlight.h>
#include <linux/slab.h>
#include <linux/module.h>

MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");

#define DRV_NAME "msi-wmi"

#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"

MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
MODULE_ALIAS("wmi:" MSIWMI_EVENT_GUID);

enum msi_scancodes {
	MSI_KEY_BRIGHTNESSUP	= 0xD0,
	MSI_KEY_BRIGHTNESSDOWN,
	MSI_KEY_VOLUMEUP,
	MSI_KEY_VOLUMEDOWN,
	MSI_KEY_MUTE,
};
static struct key_entry msi_wmi_keymap[] = {
	{ KE_KEY, MSI_KEY_BRIGHTNESSUP,		{KEY_BRIGHTNESSUP} },
	{ KE_KEY, MSI_KEY_BRIGHTNESSDOWN,	{KEY_BRIGHTNESSDOWN} },
	{ KE_KEY, MSI_KEY_VOLUMEUP,		{KEY_VOLUMEUP} },
	{ KE_KEY, MSI_KEY_VOLUMEDOWN,		{KEY_VOLUMEDOWN} },
	{ KE_KEY, MSI_KEY_MUTE,			{KEY_MUTE} },
	{ KE_END, 0 }
};

static ktime_t last_pressed;
static bool quirk_last_pressed;

static const char *event_wmi_guid;

static struct backlight_device *backlight;

static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };

static struct input_dev *msi_wmi_input_dev;

static int msi_wmi_query_block(int instance, int *ret)
{
	acpi_status status;
	union acpi_object *obj;

	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };

	status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);

	obj = output.pointer;

	if (!obj || obj->type != ACPI_TYPE_INTEGER) {
		if (obj) {
			pr_err("query block returned object "
			       "type: %d - buffer length:%d\n", obj->type,
			       obj->type == ACPI_TYPE_BUFFER ?
			       obj->buffer.length : 0);
		}
		kfree(obj);
		return -EINVAL;
	}
	*ret = obj->integer.value;
	kfree(obj);
	return 0;
}

static int msi_wmi_set_block(int instance, int value)
{
	acpi_status status;

	struct acpi_buffer input = { sizeof(int), &value };

	pr_debug("Going to set block of instance: %d - value: %d\n",
		 instance, value);

	status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);

	return ACPI_SUCCESS(status) ? 0 : 1;
}

static int bl_get(struct backlight_device *bd)
{
	int level, err, ret;

	/* Instance 1 is "get backlight", cmp with DSDT */
	err = msi_wmi_query_block(1, &ret);
	if (err) {
		pr_err("Could not query backlight: %d\n", err);
		return -EINVAL;
	}
	pr_debug("Get: Query block returned: %d\n", ret);
	for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
		if (backlight_map[level] == ret) {
			pr_debug("Current backlight level: 0x%X - index: %d\n",
				 backlight_map[level], level);
			break;
		}
	}
	if (level == ARRAY_SIZE(backlight_map)) {
		pr_err("get: Invalid brightness value: 0x%X\n", ret);
		return -EINVAL;
	}
	return level;
}

static int bl_set_status(struct backlight_device *bd)
{
	int bright = bd->props.brightness;
	if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
		return -EINVAL;

	/* Instance 0 is "set backlight" */
	return msi_wmi_set_block(0, backlight_map[bright]);
}

static const struct backlight_ops msi_backlight_ops = {
	.get_brightness	= bl_get,
	.update_status	= bl_set_status,
};

static void msi_wmi_notify(u32 value, void *context)
{
	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
	static struct key_entry *key;
	union acpi_object *obj;
	acpi_status status;

	status = wmi_get_event_data(value, &response);
	if (status != AE_OK) {
		pr_info("bad event status 0x%x\n", status);
		return;
	}

	obj = (union acpi_object *)response.pointer;

	if (obj && obj->type == ACPI_TYPE_INTEGER) {
		int eventcode = obj->integer.value;
		pr_debug("Eventcode: 0x%x\n", eventcode);
		key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
				eventcode);
		if (!key) {
			pr_info("Unknown key pressed - %x\n", eventcode);
			goto msi_wmi_notify_exit;
		}

		if (quirk_last_pressed) {
			ktime_t cur = ktime_get_real();
			ktime_t diff = ktime_sub(cur, last_pressed);
			/* Ignore event if any event happened in a 50 ms
			   timeframe -> Key press may result in 10-20 GPEs */
			if (ktime_to_us(diff) < 1000 * 50) {
				pr_debug("Suppressed key event 0x%X - "
					 "Last press was %lld us ago\n",
					 key->code, ktime_to_us(diff));
				goto msi_wmi_notify_exit;
			}
			last_pressed = cur;
		}

		if (key->type == KE_KEY &&
		/* Brightness is served via acpi video driver */
		(backlight ||
		(key->code != MSI_KEY_BRIGHTNESSUP &&
		key->code != MSI_KEY_BRIGHTNESSDOWN))) {
			pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
				 key->code, key->keycode);
			sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
						   true);
		}
	} else
		pr_info("Unknown event received\n");

msi_wmi_notify_exit:
	kfree(response.pointer);
}

static int __init msi_wmi_backlight_setup(void)
{
	int err;
	struct backlight_properties props;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
	backlight = backlight_device_register(DRV_NAME, NULL, NULL,
					      &msi_backlight_ops,
					      &props);
	if (IS_ERR(backlight))
		return PTR_ERR(backlight);

	err = bl_get(NULL);
	if (err < 0) {
		backlight_device_unregister(backlight);
		return err;
	}

	backlight->props.brightness = err;

	return 0;
}

static int __init msi_wmi_input_setup(void)
{
	int err;

	msi_wmi_input_dev = input_allocate_device();
	if (!msi_wmi_input_dev)
		return -ENOMEM;

	msi_wmi_input_dev->name = "MSI WMI hotkeys";
	msi_wmi_input_dev->phys = "wmi/input0";
	msi_wmi_input_dev->id.bustype = BUS_HOST;

	err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
	if (err)
		goto err_free_dev;

	err = input_register_device(msi_wmi_input_dev);

	if (err)
		goto err_free_keymap;

	last_pressed = ktime_set(0, 0);

	return 0;

err_free_keymap:
	sparse_keymap_free(msi_wmi_input_dev);
err_free_dev:
	input_free_device(msi_wmi_input_dev);
	return err;
}

static int __init msi_wmi_init(void)
{
	int err;

	if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
		err = msi_wmi_input_setup();
		if (err) {
			pr_err("Unable to setup input device\n");
			return err;
		}

		err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
			msi_wmi_notify, NULL);
		if (ACPI_FAILURE(err)) {
			pr_err("Unable to setup WMI notify handler\n");
			goto err_free_input;
		}

		pr_debug("Event handler installed\n");
		event_wmi_guid = MSIWMI_EVENT_GUID;
		quirk_last_pressed = true;
	}

	if (wmi_has_guid(MSIWMI_BIOS_GUID) && !acpi_video_backlight_support()) {
		err = msi_wmi_backlight_setup();
		if (err) {
			pr_err("Unable to setup backlight device\n");
			goto err_uninstall_handler;
		}
		pr_debug("Backlight device created\n");
	}

	if (!event_wmi_guid && !backlight) {
		pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
		return -ENODEV;
	}

	return 0;

err_uninstall_handler:
	if (event_wmi_guid)
		wmi_remove_notify_handler(event_wmi_guid);
err_free_input:
	if (event_wmi_guid) {
		sparse_keymap_free(msi_wmi_input_dev);
		input_unregister_device(msi_wmi_input_dev);
	}
	return err;
}

static void __exit msi_wmi_exit(void)
{
	if (event_wmi_guid) {
		wmi_remove_notify_handler(event_wmi_guid);
		sparse_keymap_free(msi_wmi_input_dev);
		input_unregister_device(msi_wmi_input_dev);
	}
	if (backlight)
		backlight_device_unregister(backlight);
}

module_init(msi_wmi_init);
module_exit(msi_wmi_exit);
Commit	Line	Data
d12d8baf TR	1	/*
	2	* MSI WMI hotkeys
	3	*
	4	* Copyright (C) 2009 Novell <trenn@suse.de>
	5	*
	6	* Most stuff taken over from hp-wmi
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
dd3c7f23	23	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
d12d8baf	24
d12d8baf	25	#include <linux/kernel.h>
d12d8baf	26	#include <linux/input.h>
c30116c6	27	#include <linux/input/sparse-keymap.h>
d12d8baf	28	#include <linux/acpi.h>
d12d8baf	29	#include <linux/backlight.h>
5a0e3ad6	30	#include <linux/slab.h>
7c52d551	31	#include <linux/module.h>
d12d8baf TR	32
	33	MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
	34	MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
	35	MODULE_LICENSE("GPL");
	36
d12d8baf	37	#define DRV_NAME "msi-wmi"
d12d8baf TR	38
	39	#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
	40	#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
	41
dd2b0251 MM	42	MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
	43	MODULE_ALIAS("wmi:" MSIWMI_EVENT_GUID);
	44
b0d3bb53	45	enum msi_scancodes {
fedda8e7	46	MSI_KEY_BRIGHTNESSUP = 0xD0,
b0d3bb53 MM	47	MSI_KEY_BRIGHTNESSDOWN,
	48	MSI_KEY_VOLUMEUP,
	49	MSI_KEY_VOLUMEDOWN,
	50	MSI_KEY_MUTE,
	51	};
d12d8baf	52	static struct key_entry msi_wmi_keymap[] = {
b0d3bb53 MM	53	{ KE_KEY, MSI_KEY_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
	54	{ KE_KEY, MSI_KEY_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
	55	{ KE_KEY, MSI_KEY_VOLUMEUP, {KEY_VOLUMEUP} },
	56	{ KE_KEY, MSI_KEY_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
	57	{ KE_KEY, MSI_KEY_MUTE, {KEY_MUTE} },
	58	{ KE_END, 0 }
d12d8baf	59	};
fedda8e7 MM	60
	61	static ktime_t last_pressed;
	62	static bool quirk_last_pressed;
d12d8baf	63
da850628 MM	64	static const char *event_wmi_guid;
da850628 MM	65
8700e161	66	static struct backlight_device *backlight;
d12d8baf TR	67
	68	static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
	69
	70	static struct input_dev *msi_wmi_input_dev;
	71
	72	static int msi_wmi_query_block(int instance, int *ret)
	73	{
	74	acpi_status status;
	75	union acpi_object *obj;
	76
	77	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	78
	79	status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
	80
	81	obj = output.pointer;
	82
	83	if (!obj \|\| obj->type != ACPI_TYPE_INTEGER) {
	84	if (obj) {
dd3c7f23	85	pr_err("query block returned object "
d12d8baf TR	86	"type: %d - buffer length:%d\n", obj->type,
	87	obj->type == ACPI_TYPE_BUFFER ?
	88	obj->buffer.length : 0);
	89	}
	90	kfree(obj);
	91	return -EINVAL;
	92	}
	93	*ret = obj->integer.value;
	94	kfree(obj);
	95	return 0;
	96	}
	97
	98	static int msi_wmi_set_block(int instance, int value)
	99	{
	100	acpi_status status;
	101
	102	struct acpi_buffer input = { sizeof(int), &value };
	103
dd3c7f23 JP	104	pr_debug("Going to set block of instance: %d - value: %d\n",
dd3c7f23 JP	105	instance, value);
d12d8baf TR	106
	107	status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
	108
	109	return ACPI_SUCCESS(status) ? 0 : 1;
	110	}
	111
	112	static int bl_get(struct backlight_device *bd)
	113	{
de078e57	114	int level, err, ret;
d12d8baf TR	115
	116	/* Instance 1 is "get backlight", cmp with DSDT */
	117	err = msi_wmi_query_block(1, &ret);
de078e57	118	if (err) {
dd3c7f23	119	pr_err("Could not query backlight: %d\n", err);
de078e57 AA	120	return -EINVAL;
de078e57 AA	121	}
dd3c7f23	122	pr_debug("Get: Query block returned: %d\n", ret);
d12d8baf TR	123	for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
d12d8baf TR	124	if (backlight_map[level] == ret) {
dd3c7f23 JP	125	pr_debug("Current backlight level: 0x%X - index: %d\n",
dd3c7f23 JP	126	backlight_map[level], level);
d12d8baf TR	127	break;
	128	}
	129	}
	130	if (level == ARRAY_SIZE(backlight_map)) {
dd3c7f23	131	pr_err("get: Invalid brightness value: 0x%X\n", ret);
d12d8baf TR	132	return -EINVAL;
	133	}
	134	return level;
	135	}
	136
	137	static int bl_set_status(struct backlight_device *bd)
	138	{
	139	int bright = bd->props.brightness;
	140	if (bright >= ARRAY_SIZE(backlight_map) \|\| bright < 0)
	141	return -EINVAL;
	142
	143	/* Instance 0 is "set backlight" */
	144	return msi_wmi_set_block(0, backlight_map[bright]);
	145	}
	146
28d85873	147	static const struct backlight_ops msi_backlight_ops = {
d12d8baf TR	148	.get_brightness = bl_get,
	149	.update_status = bl_set_status,
	150	};
	151
d12d8baf TR	152	static void msi_wmi_notify(u32 value, void *context)
	153	{
	154	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
	155	static struct key_entry *key;
	156	union acpi_object *obj;
fda11e61	157	acpi_status status;
d12d8baf	158
fda11e61 LB	159	status = wmi_get_event_data(value, &response);
fda11e61 LB	160	if (status != AE_OK) {
dd3c7f23	161	pr_info("bad event status 0x%x\n", status);
fda11e61 LB	162	return;
fda11e61 LB	163	}
d12d8baf TR	164
	165	obj = (union acpi_object *)response.pointer;
	166
	167	if (obj && obj->type == ACPI_TYPE_INTEGER) {
	168	int eventcode = obj->integer.value;
dd3c7f23	169	pr_debug("Eventcode: 0x%x\n", eventcode);
c30116c6 AA	170	key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
c30116c6 AA	171	eventcode);
fedda8e7 MM	172	if (!key) {
	173	pr_info("Unknown key pressed - %x\n", eventcode);
	174	goto msi_wmi_notify_exit;
	175	}
	176
	177	if (quirk_last_pressed) {
	178	ktime_t cur = ktime_get_real();
	179	ktime_t diff = ktime_sub(cur, last_pressed);
	180	/* Ignore event if any event happened in a 50 ms
d12d8baf	181	timeframe -> Key press may result in 10-20 GPEs */
c30116c6	182	if (ktime_to_us(diff) < 1000 * 50) {
dd3c7f23 JP	183	pr_debug("Suppressed key event 0x%X - "
dd3c7f23 JP	184	"Last press was %lld us ago\n",
c30116c6	185	key->code, ktime_to_us(diff));
51c94491	186	goto msi_wmi_notify_exit;
d12d8baf	187	}
fedda8e7 MM	188	last_pressed = cur;
	189	}
	190
	191	if (key->type == KE_KEY &&
	192	/* Brightness is served via acpi video driver */
	193	(backlight \|\|
	194	(key->code != MSI_KEY_BRIGHTNESSUP &&
	195	key->code != MSI_KEY_BRIGHTNESSDOWN))) {
	196	pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
	197	key->code, key->keycode);
	198	sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
	199	true);
	200	}
d12d8baf	201	} else
dd3c7f23	202	pr_info("Unknown event received\n");
51c94491 MM	203
51c94491 MM	204	msi_wmi_notify_exit:
d12d8baf TR	205	kfree(response.pointer);
	206	}
	207
da850628 MM	208	static int __init msi_wmi_backlight_setup(void)
	209	{
	210	int err;
	211	struct backlight_properties props;
	212
	213	memset(&props, 0, sizeof(struct backlight_properties));
	214	props.type = BACKLIGHT_PLATFORM;
	215	props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
	216	backlight = backlight_device_register(DRV_NAME, NULL, NULL,
	217	&msi_backlight_ops,
	218	&props);
	219	if (IS_ERR(backlight))
	220	return PTR_ERR(backlight);
	221
	222	err = bl_get(NULL);
	223	if (err < 0) {
	224	backlight_device_unregister(backlight);
	225	return err;
	226	}
	227
	228	backlight->props.brightness = err;
	229
	230	return 0;
	231	}
	232
d12d8baf TR	233	static int __init msi_wmi_input_setup(void)
d12d8baf TR	234	{
d12d8baf TR	235	int err;
	236
	237	msi_wmi_input_dev = input_allocate_device();
46b51eb9 AA	238	if (!msi_wmi_input_dev)
46b51eb9 AA	239	return -ENOMEM;
d12d8baf TR	240
	241	msi_wmi_input_dev->name = "MSI WMI hotkeys";
	242	msi_wmi_input_dev->phys = "wmi/input0";
	243	msi_wmi_input_dev->id.bustype = BUS_HOST;
c30116c6 AA	244
	245	err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
	246	if (err)
	247	goto err_free_dev;
d12d8baf TR	248
	249	err = input_register_device(msi_wmi_input_dev);
	250
c30116c6 AA	251	if (err)
	252	goto err_free_keymap;
	253
fedda8e7	254	last_pressed = ktime_set(0, 0);
d12d8baf TR	255
d12d8baf TR	256	return 0;
c30116c6 AA	257
	258	err_free_keymap:
	259	sparse_keymap_free(msi_wmi_input_dev);
	260	err_free_dev:
	261	input_free_device(msi_wmi_input_dev);
	262	return err;
d12d8baf TR	263	}
	264
	265	static int __init msi_wmi_init(void)
	266	{
	267	int err;
	268
da850628 MM	269	if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
	270	err = msi_wmi_input_setup();
	271	if (err) {
	272	pr_err("Unable to setup input device\n");
	273	return err;
	274	}
d12d8baf	275
da850628 MM	276	err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
	277	msi_wmi_notify, NULL);
	278	if (ACPI_FAILURE(err)) {
	279	pr_err("Unable to setup WMI notify handler\n");
46b51eb9	280	goto err_free_input;
28d85873	281	}
46b51eb9	282
da850628 MM	283	pr_debug("Event handler installed\n");
da850628 MM	284	event_wmi_guid = MSIWMI_EVENT_GUID;
fedda8e7	285	quirk_last_pressed = true;
da850628 MM	286	}
	287
	288	if (wmi_has_guid(MSIWMI_BIOS_GUID) && !acpi_video_backlight_support()) {
	289	err = msi_wmi_backlight_setup();
	290	if (err) {
	291	pr_err("Unable to setup backlight device\n");
	292	goto err_uninstall_handler;
	293	}
	294	pr_debug("Backlight device created\n");
	295	}
46b51eb9	296
da850628 MM	297	if (!event_wmi_guid && !backlight) {
	298	pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
	299	return -ENODEV;
d12d8baf	300	}
46b51eb9	301
d12d8baf	302	return 0;
46b51eb9	303
da850628 MM	304	err_uninstall_handler:
	305	if (event_wmi_guid)
	306	wmi_remove_notify_handler(event_wmi_guid);
46b51eb9	307	err_free_input:
da850628 MM	308	if (event_wmi_guid) {
	309	sparse_keymap_free(msi_wmi_input_dev);
	310	input_unregister_device(msi_wmi_input_dev);
	311	}
46b51eb9	312	return err;
d12d8baf TR	313	}
	314
	315	static void __exit msi_wmi_exit(void)
	316	{
da850628 MM	317	if (event_wmi_guid) {
da850628 MM	318	wmi_remove_notify_handler(event_wmi_guid);
c30116c6	319	sparse_keymap_free(msi_wmi_input_dev);
d12d8baf	320	input_unregister_device(msi_wmi_input_dev);
d12d8baf	321	}
da850628 MM	322	if (backlight)
da850628 MM	323	backlight_device_unregister(backlight);
d12d8baf TR	324	}
	325
	326	module_init(msi_wmi_init);
	327	module_exit(msi_wmi_exit);