summaryrefslogtreecommitdiff
path: root/drivers/misc/msi-laptop.c
blob: 8e5e07e4c1cf6b91219148ad82bf10f1469fe3e6 (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
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
/*-*-linux-c-*-*/

/*
  Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>

  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., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.
 */

/*
 * msi-laptop.c - MSI S270 laptop support. This laptop is sold under
 * various brands, including "Cytron/TCM/Medion/Tchibo MD96100".
 *
 * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:
 *
 *   lcd_level - Screen brightness: contains a single integer in the
 *   range 0..8. (rw)
 *
 *   auto_brightness - Enable automatic brightness control: contains
 *   either 0 or 1. If set to 1 the hardware adjusts the screen
 *   brightness automatically when the power cord is
 *   plugged/unplugged. (rw)
 *
 *   wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)
 *
 *   bluetooth - Bluetooth subsystem enabled: contains either 0 or 1
 *   Please note that this file is constantly 0 if no Bluetooth
 *   hardware is available. (ro)
 *
 * In addition to these platform device attributes the driver
 * registers itself in the Linux backlight control subsystem and is
 * available to userspace under /sys/class/backlight/msi-laptop-bl/.
 *
 * This driver might work on other laptops produced by MSI. If you
 * want to try it you can pass force=1 as argument to the module which
 * will force it to load even when the DMI data doesn't identify the
 * laptop as MSI S270. YMMV.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <linux/autoconf.h>

#define MSI_DRIVER_VERSION "0.5"

#define MSI_LCD_LEVEL_MAX 9

#define MSI_EC_COMMAND_WIRELESS 0x10
#define MSI_EC_COMMAND_LCD_LEVEL 0x11

static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

static int auto_brightness;
module_param(auto_brightness, int, 0);
MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");

/* Hardware access */

static int set_lcd_level(int level)
{
	u8 buf[2];

	if (level < 0 || level >= MSI_LCD_LEVEL_MAX)
		return -EINVAL;

	buf[0] = 0x80;
	buf[1] = (u8) (level*31);

	return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0);
}

static int get_lcd_level(void)
{
	u8 wdata = 0, rdata;
	int result;

	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
	if (result < 0)
		return result;

	return (int) rdata / 31;
}

static int get_auto_brightness(void)
{
	u8 wdata = 4, rdata;
	int result;

	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
	if (result < 0)
		return result;

	return !!(rdata & 8);
}

static int set_auto_brightness(int enable)
{
	u8 wdata[2], rdata;
	int result;

	wdata[0] = 4;

	result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1);
	if (result < 0)
		return result;

	wdata[0] = 0x84;
	wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);

	return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0);
}

static int get_wireless_state(int *wlan, int *bluetooth)
{
	u8 wdata = 0, rdata;
	int result;

	result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1);
	if (result < 0)
		return -1;

	if (wlan)
		*wlan = !!(rdata & 8);

	if (bluetooth)
		*bluetooth = !!(rdata & 128);

	return 0;
}

/* Backlight device stuff */

static int bl_get_brightness(struct backlight_device *b)
{
	return get_lcd_level();
}


static int bl_update_status(struct backlight_device *b)
{
	return set_lcd_level(b->props->brightness);
}

static struct backlight_properties msibl_props = {
	.owner		= THIS_MODULE,
	.get_brightness = bl_get_brightness,
	.update_status  = bl_update_status,
	.max_brightness = MSI_LCD_LEVEL_MAX-1,
};

static struct backlight_device *msibl_device;

/* Platform device */

static ssize_t show_wlan(struct device *dev,
	struct device_attribute *attr, char *buf)
{

	int ret, enabled;

	ret = get_wireless_state(&enabled, NULL);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", enabled);
}

static ssize_t show_bluetooth(struct device *dev,
	struct device_attribute *attr, char *buf)
{

	int ret, enabled;

	ret = get_wireless_state(NULL, &enabled);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", enabled);
}

static ssize_t show_lcd_level(struct device *dev,
	struct device_attribute *attr, char *buf)
{

	int ret;

	ret = get_lcd_level();
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", ret);
}

static ssize_t store_lcd_level(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{

	int level, ret;

	if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX))
		return -EINVAL;

	ret = set_lcd_level(level);
	if (ret < 0)
		return ret;

	return count;
}

static ssize_t show_auto_brightness(struct device *dev,
	struct device_attribute *attr, char *buf)
{

	int ret;

	ret = get_auto_brightness();
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", ret);
}

static ssize_t store_auto_brightness(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{

	int enable, ret;

	if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1)))
		return -EINVAL;

	ret = set_auto_brightness(enable);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);
static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);
static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);

static struct attribute *msipf_attributes[] = {
	&dev_attr_lcd_level.attr,
	&dev_attr_auto_brightness.attr,
	&dev_attr_bluetooth.attr,
	&dev_attr_wlan.attr,
	NULL
};

static struct attribute_group msipf_attribute_group = {
	.attrs = msipf_attributes
};

static struct platform_driver msipf_driver = {
	.driver = {
		.name = "msi-laptop-pf",
		.owner = THIS_MODULE,
	}
};

static struct platform_device *msipf_device;

/* Initialization */

static struct dmi_system_id __initdata msi_dmi_table[] = {
	{
		.ident = "MSI S270",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),
			DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),
		}
	},
	{
		.ident = "Medion MD96100",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),
			DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),
		}
	},
	{ }
};


static int __init msi_init(void)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;

	if (!force && !dmi_check_system(msi_dmi_table))
		return -ENODEV;

	if (auto_brightness < 0 || auto_brightness > 2)
		return -EINVAL;

	/* Register backlight stuff */

	msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
						&msibl_props);
	if (IS_ERR(msibl_device))
		return PTR_ERR(msibl_device);

	ret = platform_driver_register(&msipf_driver);
	if (ret)
		goto fail_backlight;

	/* Register platform stuff */

	msipf_device = platform_device_alloc("msi-laptop-pf", -1);
	if (!msipf_device) {
		ret = -ENOMEM;
		goto fail_platform_driver;
	}

	ret = platform_device_add(msipf_device);
	if (ret)
		goto fail_platform_device1;

	ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);
	if (ret)
		goto fail_platform_device2;

	/* Disable automatic brightness control by default because
	 * this module was probably loaded to do brightness control in
	 * software. */

	if (auto_brightness != 2)
		set_auto_brightness(auto_brightness);

	printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");

	return 0;

fail_platform_device2:

	platform_device_del(msipf_device);

fail_platform_device1:

	platform_device_put(msipf_device);

fail_platform_driver:

	platform_driver_unregister(&msipf_driver);

fail_backlight:

	backlight_device_unregister(msibl_device);

	return ret;
}

static void __exit msi_cleanup(void)
{

	sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);
	platform_device_unregister(msipf_device);
	platform_driver_unregister(&msipf_driver);
	backlight_device_unregister(msibl_device);

	/* Enable automatic brightness control again */
	if (auto_brightness != 2)
		set_auto_brightness(1);

	printk(KERN_INFO "msi-laptop: driver unloaded.\n");
}

module_init(msi_init);
module_exit(msi_cleanup);

MODULE_AUTHOR("Lennart Poettering");
MODULE_DESCRIPTION("MSI Laptop Support");
MODULE_VERSION(MSI_DRIVER_VERSION);
MODULE_LICENSE("GPL");