summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/msi-wmi.c
blob: 6f40bf202dc7cf9e6baa80a329a3ea1810fcb5ed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
/*
 * 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>

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

MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");

#define DRV_NAME "msi-wmi"

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

#define SCANCODE_BASE 0xD0
#define MSI_WMI_BRIGHTNESSUP   SCANCODE_BASE
#define MSI_WMI_BRIGHTNESSDOWN (SCANCODE_BASE + 1)
#define MSI_WMI_VOLUMEUP       (SCANCODE_BASE + 2)
#define MSI_WMI_VOLUMEDOWN     (SCANCODE_BASE + 3)
#define MSI_WMI_MUTE           (SCANCODE_BASE + 4)
static struct key_entry msi_wmi_keymap[] = {
	{ KE_KEY, MSI_WMI_BRIGHTNESSUP,   {KEY_BRIGHTNESSUP} },
	{ KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
	{ KE_KEY, MSI_WMI_VOLUMEUP,       {KEY_VOLUMEUP} },
	{ KE_KEY, MSI_WMI_VOLUMEDOWN,     {KEY_VOLUMEDOWN} },
	{ KE_KEY, MSI_WMI_MUTE,           {KEY_MUTE} },
	{ KE_END, 0}
};
static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];

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;
	ktime_t cur;
	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) {
			ktime_t diff;
			cur = ktime_get_real();
			diff = ktime_sub(cur, last_pressed[key->code -
					SCANCODE_BASE]);
			/* Ignore event if the same 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));
				return;
			}
			last_pressed[key->code - SCANCODE_BASE] = cur;

			if (key->type == KE_KEY &&
			/* Brightness is served via acpi video driver */
			(!acpi_video_backlight_support() ||
			(key->code != MSI_WMI_BRIGHTNESSUP &&
			key->code != MSI_WMI_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 key pressed - %x\n", eventcode);
	} else
		pr_info("Unknown event received\n");
	kfree(response.pointer);
}

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;

	memset(last_pressed, 0, sizeof(last_pressed));

	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)) {
		pr_err("This machine doesn't have MSI-hotkeys through WMI\n");
		return -ENODEV;
	}
	err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
			msi_wmi_notify, NULL);
	if (ACPI_FAILURE(err))
		return -EINVAL;

	err = msi_wmi_input_setup();
	if (err)
		goto err_uninstall_notifier;

	if (!acpi_video_backlight_support()) {
		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)) {
			err = PTR_ERR(backlight);
			goto err_free_input;
		}

		err = bl_get(NULL);
		if (err < 0)
			goto err_free_backlight;

		backlight->props.brightness = err;
	}
	pr_debug("Event handler installed\n");

	return 0;

err_free_backlight:
	backlight_device_unregister(backlight);
err_free_input:
	sparse_keymap_free(msi_wmi_input_dev);
	input_unregister_device(msi_wmi_input_dev);
err_uninstall_notifier:
	wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
	return err;
}

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

module_init(msi_wmi_init);
module_exit(msi_wmi_exit);