aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/misc/wistron_btns.c
blob: a05b8557842f56554ceb88bb4edbbfb2c44305fe (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
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
/*
 * Wistron laptop button driver
 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
 *
 * You can redistribute and/or modify this program under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation.
 *
 * 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.
 */
#include <asm/io.h>
#include <linux/dmi.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mc146818rtc.h>
#include <linux/module.h>
#include <linux/preempt.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/platform_device.h>

/*
 * Number of attempts to read data from queue per poll;
 * the queue can hold up to 31 entries
 */
#define MAX_POLL_ITERATIONS 64

#define POLL_FREQUENCY 10 /* Number of polls per second */

#if POLL_FREQUENCY > HZ
#error "POLL_FREQUENCY too high"
#endif

/* BIOS subsystem IDs */
#define WIFI		0x35
#define BLUETOOTH	0x34

MODULE_AUTHOR("Miloslav Trmac <mitr@volny.cz>");
MODULE_DESCRIPTION("Wistron laptop button driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1");

static int force; /* = 0; */
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Load even if computer is not in database");

static char *keymap_name; /* = NULL; */
module_param_named(keymap, keymap_name, charp, 0);
MODULE_PARM_DESC(keymap, "Keymap name, if it can't be autodetected");

static struct platform_device *wistron_device;

 /* BIOS interface implementation */

static void __iomem *bios_entry_point; /* BIOS routine entry point */
static void __iomem *bios_code_map_base;
static void __iomem *bios_data_map_base;

static u8 cmos_address;

struct regs {
	u32 eax, ebx, ecx;
};

static void call_bios(struct regs *regs)
{
	unsigned long flags;

	preempt_disable();
	local_irq_save(flags);
	asm volatile ("pushl %%ebp;"
		      "movl %7, %%ebp;"
		      "call *%6;"
		      "popl %%ebp"
		      : "=a" (regs->eax), "=b" (regs->ebx), "=c" (regs->ecx)
		      : "0" (regs->eax), "1" (regs->ebx), "2" (regs->ecx),
			"m" (bios_entry_point), "m" (bios_data_map_base)
		      : "edx", "edi", "esi", "memory");
	local_irq_restore(flags);
	preempt_enable();
}

static size_t __init locate_wistron_bios(void __iomem *base)
{
	static const unsigned char __initdata signature[] =
		{ 0x42, 0x21, 0x55, 0x30 };
	size_t offset;

	for (offset = 0; offset < 0x10000; offset += 0x10) {
		if (check_signature(base + offset, signature,
				    sizeof(signature)) != 0)
			return offset;
	}
	return -1;
}

static int __init map_bios(void)
{
	void __iomem *base;
	size_t offset;
	u32 entry_point;

	base = ioremap(0xF0000, 0x10000); /* Can't fail */
	offset = locate_wistron_bios(base);
	if (offset < 0) {
		printk(KERN_ERR "wistron_btns: BIOS entry point not found\n");
		iounmap(base);
		return -ENODEV;
	}

	entry_point = readl(base + offset + 5);
	printk(KERN_DEBUG
		"wistron_btns: BIOS signature found at %p, entry point %08X\n",
		base + offset, entry_point);

	if (entry_point >= 0xF0000) {
		bios_code_map_base = base;
		bios_entry_point = bios_code_map_base + (entry_point & 0xFFFF);
	} else {
		iounmap(base);
		bios_code_map_base = ioremap(entry_point & ~0x3FFF, 0x4000);
		if (bios_code_map_base == NULL) {
			printk(KERN_ERR
				"wistron_btns: Can't map BIOS code at %08X\n",
				entry_point & ~0x3FFF);
			goto err;
		}
		bios_entry_point = bios_code_map_base + (entry_point & 0x3FFF);
	}
	/* The Windows driver maps 0x10000 bytes, we keep only one page... */
	bios_data_map_base = ioremap(0x400, 0xc00);
	if (bios_data_map_base == NULL) {
		printk(KERN_ERR "wistron_btns: Can't map BIOS data\n");
		goto err_code;
	}
	return 0;

err_code:
	iounmap(bios_code_map_base);
err:
	return -ENOMEM;
}

static inline void unmap_bios(void)
{
	iounmap(bios_code_map_base);
	iounmap(bios_data_map_base);
}

 /* BIOS calls */

static u16 bios_pop_queue(void)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x061C;
	regs.ecx = 0x0000;
	call_bios(&regs);

	return regs.eax;
}

static void __devinit bios_attach(void)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x012E;
	call_bios(&regs);
}

static void bios_detach(void)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x002E;
	call_bios(&regs);
}

static u8 __devinit bios_get_cmos_address(void)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x051C;
	call_bios(&regs);

	return regs.ecx;
}

static u16 __devinit bios_get_default_setting(u8 subsys)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = 0x0200 | subsys;
	call_bios(&regs);

	return regs.eax;
}

static void bios_set_state(u8 subsys, int enable)
{
	struct regs regs;

	memset(&regs, 0, sizeof (regs));
	regs.eax = 0x9610;
	regs.ebx = (enable ? 0x0100 : 0x0000) | subsys;
	call_bios(&regs);
}

/* Hardware database */

struct key_entry {
	char type;		/* See KE_* below */
	u8 code;
	unsigned keycode;	/* For KE_KEY */
};

enum { KE_END, KE_KEY, KE_WIFI, KE_BLUETOOTH };

static const struct key_entry *keymap; /* = NULL; Current key map */
static int have_wifi;
static int have_bluetooth;

static int __init dmi_matched(struct dmi_system_id *dmi)
{
	const struct key_entry *key;

	keymap = dmi->driver_data;
	for (key = keymap; key->type != KE_END; key++) {
		if (key->type == KE_WIFI) {
			have_wifi = 1;
			break;
		} else if (key->type == KE_BLUETOOTH) {
			have_bluetooth = 1;
			break;
		}
	}
	return 1;
}

static struct key_entry keymap_empty[] = {
	{ KE_END, 0 }
};

static struct key_entry keymap_fs_amilo_pro_v2000[] = {
	{ KE_KEY,  0x01, KEY_HELP },
	{ KE_KEY,  0x11, KEY_PROG1 },
	{ KE_KEY,  0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY,  0x31, KEY_MAIL },
	{ KE_KEY,  0x36, KEY_WWW },
	{ KE_END,  0 }
};

static struct key_entry keymap_wistron_ms2141[] = {
	{ KE_KEY,  0x11, KEY_PROG1 },
	{ KE_KEY,  0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY,  0x22, KEY_REWIND },
	{ KE_KEY,  0x23, KEY_FORWARD },
	{ KE_KEY,  0x24, KEY_PLAYPAUSE },
	{ KE_KEY,  0x25, KEY_STOPCD },
	{ KE_KEY,  0x31, KEY_MAIL },
	{ KE_KEY,  0x36, KEY_WWW },
	{ KE_END,  0 }
};

static struct key_entry keymap_acer_aspire_1500[] = {
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_BLUETOOTH, 0x44, 0 },
	{ KE_END, 0 }
};

static struct key_entry keymap_acer_travelmate_240[] = {
	{ KE_KEY, 0x31, KEY_MAIL },
	{ KE_KEY, 0x36, KEY_WWW },
	{ KE_KEY, 0x11, KEY_PROG1 },
	{ KE_KEY, 0x12, KEY_PROG2 },
	{ KE_BLUETOOTH, 0x44, 0 },
	{ KE_WIFI, 0x30, 0 },
	{ KE_END, 0 }
};

/*
 * If your machine is not here (which is currently rather likely), please send
 * a list of buttons and their key codes (reported when loading this module
 * with force=1) and the output of dmidecode to $MODULE_AUTHOR.
 */
static struct dmi_system_id dmi_ids[] = {
	{
		.callback = dmi_matched,
		.ident = "Fujitsu-Siemens Amilo Pro V2000",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Pro V2000"),
		},
		.driver_data = keymap_fs_amilo_pro_v2000
	},
	{
		.callback = dmi_matched,
		.ident = "Acer Aspire 1500",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1500"),
		},
		.driver_data = keymap_acer_aspire_1500
	},
	{
		.callback = dmi_matched,
		.ident = "Acer TravelMate 240",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 240"),
		},
		.driver_data = keymap_acer_travelmate_240
	},
	{ NULL, }
};

static int __init select_keymap(void)
{
	if (keymap_name != NULL) {
		if (strcmp (keymap_name, "1557/MS2141") == 0)
			keymap = keymap_wistron_ms2141;
		else {
			printk(KERN_ERR "wistron_btns: Keymap unknown\n");
			return -EINVAL;
		}
	}
	dmi_check_system(dmi_ids);
	if (keymap == NULL) {
		if (!force) {
			printk(KERN_ERR "wistron_btns: System unknown\n");
			return -ENODEV;
		}
		keymap = keymap_empty;
	}
	return 0;
}

 /* Input layer interface */

static struct input_dev *input_dev;

static int __devinit setup_input_dev(void)
{
	const struct key_entry *key;
	int error;

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

	input_dev->name = "Wistron laptop buttons";
	input_dev->phys = "wistron/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->cdev.dev = &wistron_device->dev;

	for (key = keymap; key->type != KE_END; key++) {
		if (key->type == KE_KEY) {
			input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
			set_bit(key->keycode, input_dev->keybit);
		}
	}

	error = input_register_device(input_dev);
	if (error) {
		input_free_device(input_dev);
		return error;
	}

	return 0;
}

static void report_key(unsigned keycode)
{
	input_report_key(input_dev, keycode, 1);
	input_sync(input_dev);
	input_report_key(input_dev, keycode, 0);
	input_sync(input_dev);
}

 /* Driver core */

static int wifi_enabled;
static int bluetooth_enabled;

static void poll_bios(unsigned long);

static struct timer_list poll_timer = TIMER_INITIALIZER(poll_bios, 0, 0);

static void handle_key(u8 code)
{
	const struct key_entry *key;

	for (key = keymap; key->type != KE_END; key++) {
		if (code == key->code) {
			switch (key->type) {
			case KE_KEY:
				report_key(key->keycode);
				break;

			case KE_WIFI:
				if (have_wifi) {
					wifi_enabled = !wifi_enabled;
					bios_set_state(WIFI, wifi_enabled);
				}
				break;

			case KE_BLUETOOTH:
				if (have_bluetooth) {
					bluetooth_enabled = !bluetooth_enabled;
					bios_set_state(BLUETOOTH, bluetooth_enabled);
				}
				break;

			case KE_END:
			default:
				BUG();
			}
			return;
		}
	}
	printk(KERN_NOTICE "wistron_btns: Unknown key code %02X\n", code);
}

static void poll_bios(unsigned long discard)
{
	u8 qlen;
	u16 val;

	for (;;) {
		qlen = CMOS_READ(cmos_address);
		if (qlen == 0)
			break;
		val = bios_pop_queue();
		if (val != 0 && !discard)
			handle_key((u8)val);
	}

	mod_timer(&poll_timer, jiffies + HZ / POLL_FREQUENCY);
}

static int __devinit wistron_probe(struct platform_device *dev)
{
	int err = setup_input_dev();
	if (err)
		return err;

	bios_attach();
	cmos_address = bios_get_cmos_address();

	if (have_wifi) {
		u16 wifi = bios_get_default_setting(WIFI);
		if (wifi & 1)
			wifi_enabled = (wifi & 2) ? 1 : 0;
		else
			have_wifi = 0;

		if (have_wifi)
			bios_set_state(WIFI, wifi_enabled);
	}

	if (have_bluetooth) {
		u16 bt = bios_get_default_setting(BLUETOOTH);
		if (bt & 1)
			bluetooth_enabled = (bt & 2) ? 1 : 0;
		else
			have_bluetooth = 0;

		if (have_bluetooth)
			bios_set_state(BLUETOOTH, bluetooth_enabled);
	}

	poll_bios(1); /* Flush stale event queue and arm timer */

	return 0;
}

static int __devexit wistron_remove(struct platform_device *dev)
{
	del_timer_sync(&poll_timer);
	input_unregister_device(input_dev);
	bios_detach();

	return 0;
}

#ifdef CONFIG_PM
static int wistron_suspend(struct platform_device *dev, pm_message_t state)
{
	del_timer_sync(&poll_timer);

	if (have_wifi)
		bios_set_state(WIFI, 0);

	if (have_bluetooth)
		bios_set_state(BLUETOOTH, 0);

	return 0;
}

static int wistron_resume(struct platform_device *dev)
{
	if (have_wifi)
		bios_set_state(WIFI, wifi_enabled);

	if (have_bluetooth)
		bios_set_state(BLUETOOTH, bluetooth_enabled);

	poll_bios(1);

	return 0;
}
#else
#define wistron_suspend		NULL
#define wistron_resume		NULL
#endif

static struct platform_driver wistron_driver = {
	.driver		= {
		.name	= "wistron-bios",
		.owner	= THIS_MODULE,
	},
	.probe		= wistron_probe,
	.remove		= __devexit_p(wistron_remove),
	.suspend	= wistron_suspend,
	.resume		= wistron_resume,
};

static int __init wb_module_init(void)
{
	int err;

	err = select_keymap();
	if (err)
		return err;

	err = map_bios();
	if (err)
		return err;

	err = platform_driver_register(&wistron_driver);
	if (err)
		goto err_unmap_bios;

	wistron_device = platform_device_alloc("wistron-bios", -1);
	if (!wistron_device) {
		err = -ENOMEM;
		goto err_unregister_driver;
	}

	err = platform_device_add(wistron_device);
	if (err)
		goto err_free_device;

	return 0;

 err_free_device:
	platform_device_put(wistron_device);
 err_unregister_driver:
	platform_driver_unregister(&wistron_driver);
 err_unmap_bios:
	unmap_bios();

	return err;
}

static void __exit wb_module_exit(void)
{
	platform_device_unregister(wistron_device);
	platform_driver_unregister(&wistron_driver);
	unmap_bios();
}

module_init(wb_module_init);
module_exit(wb_module_exit);