Free Electrons

Embedded Linux Experts

  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
397
398
399
400
401
402
403
404
405
406
/*-*-linux-c-*-*/

/*
  Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>

  based on MSI driver

  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.
 */

/*
 * comapl-laptop.c - Compal laptop support.
 *
 * This driver exports a few files in /sys/devices/platform/compal-laptop/:
 *
 *   wlan - wlan subsystem state: contains 0 or 1 (rw)
 *
 *   bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
 *
 *   raw - raw value taken from embedded controller register (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/compal-laptop/.
 *
 * This driver might work on other laptops produced by Compal. 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 FL9x.
 */

#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 COMPAL_DRIVER_VERSION "0.2.6"

#define COMPAL_LCD_LEVEL_MAX 8

#define COMPAL_EC_COMMAND_WIRELESS 0xBB
#define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9

#define KILLSWITCH_MASK 0x10
#define WLAN_MASK	0x01
#define BT_MASK 	0x02

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

/* Hardware access */

static int set_lcd_level(int level)
{
	if (level < 0 || level >= COMPAL_LCD_LEVEL_MAX)
		return -EINVAL;

	ec_write(COMPAL_EC_COMMAND_LCD_LEVEL, level);

	return 0;
}

static int get_lcd_level(void)
{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_LCD_LEVEL, &result);

	return (int) result;
}

static int set_wlan_state(int state)
{
	u8 result, value;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if ((result & KILLSWITCH_MASK) == 0)
		return -EINVAL;
	else {
		if (state)
			value = (u8) (result | WLAN_MASK);
		else
			value = (u8) (result & ~WLAN_MASK);
		ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
	}

	return 0;
}

static int set_bluetooth_state(int state)
{
	u8 result, value;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if ((result & KILLSWITCH_MASK) == 0)
		return -EINVAL;
	else {
		if (state)
			value = (u8) (result | BT_MASK);
		else
			value = (u8) (result & ~BT_MASK);
		ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
	}

	return 0;
}

static int get_wireless_state(int *wlan, int *bluetooth)
{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

	if (wlan) {
		if ((result & KILLSWITCH_MASK) == 0)
			*wlan = 0;
		else
			*wlan = result & WLAN_MASK;
	}

	if (bluetooth) {
		if ((result & KILLSWITCH_MASK) == 0)
			*bluetooth = 0;
		else
			*bluetooth = (result & BT_MASK) >> 1;
	}

	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_ops compalbl_ops = {
	.get_brightness = bl_get_brightness,
	.update_status	= bl_update_status,
};

static struct backlight_device *compalbl_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_raw(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	u8 result;

	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);

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

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 store_wlan_state(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	int state, ret;

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

	ret = set_wlan_state(state);
	if (ret < 0)
		return ret;

	return count;
}

static ssize_t store_bluetooth_state(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	int state, ret;

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

	ret = set_bluetooth_state(state);
	if (ret < 0)
		return ret;

	return count;
}

static DEVICE_ATTR(bluetooth, 0644, show_bluetooth, store_bluetooth_state);
static DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan_state);
static DEVICE_ATTR(raw, 0444, show_raw, NULL);

static struct attribute *compal_attributes[] = {
	&dev_attr_bluetooth.attr,
	&dev_attr_wlan.attr,
	&dev_attr_raw.attr,
	NULL
};

static struct attribute_group compal_attribute_group = {
	.attrs = compal_attributes
};

static struct platform_driver compal_driver = {
	.driver = {
		.name = "compal-laptop",
		.owner = THIS_MODULE,
	}
};

static struct platform_device *compal_device;

/* Initialization */

static int dmi_check_cb(const struct dmi_system_id *id)
{
	printk(KERN_INFO "compal-laptop: Identified laptop model '%s'.\n",
		id->ident);

	return 0;
}

static struct dmi_system_id __initdata compal_dmi_table[] = {
	{
		.ident = "FL90/IFL90",
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
		},
		.callback = dmi_check_cb
	},
	{
		.ident = "FL90/IFL90",
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
			DMI_MATCH(DMI_BOARD_VERSION, "REFERENCE"),
		},
		.callback = dmi_check_cb
	},
	{
		.ident = "FL91/IFL91",
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "IFL91"),
			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
		},
		.callback = dmi_check_cb
	},
	{
		.ident = "FL92/JFL92",
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "JFL92"),
			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
		},
		.callback = dmi_check_cb
	},
	{
		.ident = "FT00/IFT00",
		.matches = {
			DMI_MATCH(DMI_BOARD_NAME, "IFT00"),
			DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
		},
		.callback = dmi_check_cb
	},
	{ }
};

static int __init compal_init(void)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;

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

	/* Register backlight stuff */

	if (!acpi_video_backlight_support()) {
		compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
							    &compalbl_ops);
		if (IS_ERR(compalbl_device))
			return PTR_ERR(compalbl_device);

		compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
	}

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

	/* Register platform stuff */

	compal_device = platform_device_alloc("compal-laptop", -1);
	if (!compal_device) {
		ret = -ENOMEM;
		goto fail_platform_driver;
	}

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

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

	printk(KERN_INFO "compal-laptop: driver "COMPAL_DRIVER_VERSION
		" successfully loaded.\n");

	return 0;

fail_platform_device2:

	platform_device_del(compal_device);

fail_platform_device1:

	platform_device_put(compal_device);

fail_platform_driver:

	platform_driver_unregister(&compal_driver);

fail_backlight:

	backlight_device_unregister(compalbl_device);

	return ret;
}

static void __exit compal_cleanup(void)
{

	sysfs_remove_group(&compal_device->dev.kobj, &compal_attribute_group);
	platform_device_unregister(compal_device);
	platform_driver_unregister(&compal_driver);
	backlight_device_unregister(compalbl_device);

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

module_init(compal_init);
module_exit(compal_cleanup);

MODULE_AUTHOR("Cezary Jackiewicz");
MODULE_DESCRIPTION("Compal Laptop Support");
MODULE_VERSION(COMPAL_DRIVER_VERSION);
MODULE_LICENSE("GPL");

MODULE_ALIAS("dmi:*:rnIFL90:rvrIFT00:*");
MODULE_ALIAS("dmi:*:rnIFL90:rvrREFERENCE:*");
MODULE_ALIAS("dmi:*:rnIFL91:rvrIFT00:*");
MODULE_ALIAS("dmi:*:rnJFL92:rvrIFT00:*");
MODULE_ALIAS("dmi:*:rnIFT00:rvrIFT00:*");