summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/classmate-laptop.c
blob: e2230a2b2f8e3e82056ef7d197eb877999f337e9 (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
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
/*
 *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
 *
 *  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.
 */


#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <acpi/acpi_drivers.h>
#include <linux/backlight.h>
#include <linux/input.h>
#include <linux/rfkill.h>

MODULE_LICENSE("GPL");


struct cmpc_accel {
	int sensitivity;
};

#define CMPC_ACCEL_SENSITIVITY_DEFAULT		5


#define CMPC_ACCEL_HID		"ACCE0000"
#define CMPC_TABLET_HID		"TBLT0000"
#define CMPC_IPML_HID	"IPML200"
#define CMPC_KEYS_HID		"FnBT0000"

/*
 * Generic input device code.
 */

typedef void (*input_device_init)(struct input_dev *dev);

static int cmpc_add_acpi_notify_device(struct acpi_device *acpi, char *name,
				       input_device_init idev_init)
{
	struct input_dev *inputdev;
	int error;

	inputdev = input_allocate_device();
	if (!inputdev)
		return -ENOMEM;
	inputdev->name = name;
	inputdev->dev.parent = &acpi->dev;
	idev_init(inputdev);
	error = input_register_device(inputdev);
	if (error) {
		input_free_device(inputdev);
		return error;
	}
	dev_set_drvdata(&acpi->dev, inputdev);
	return 0;
}

static int cmpc_remove_acpi_notify_device(struct acpi_device *acpi)
{
	struct input_dev *inputdev = dev_get_drvdata(&acpi->dev);
	input_unregister_device(inputdev);
	return 0;
}

/*
 * Accelerometer code.
 */
static acpi_status cmpc_start_accel(acpi_handle handle)
{
	union acpi_object param[2];
	struct acpi_object_list input;
	acpi_status status;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0x3;
	param[1].type = ACPI_TYPE_INTEGER;
	input.count = 2;
	input.pointer = param;
	status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
	return status;
}

static acpi_status cmpc_stop_accel(acpi_handle handle)
{
	union acpi_object param[2];
	struct acpi_object_list input;
	acpi_status status;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0x4;
	param[1].type = ACPI_TYPE_INTEGER;
	input.count = 2;
	input.pointer = param;
	status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
	return status;
}

static acpi_status cmpc_accel_set_sensitivity(acpi_handle handle, int val)
{
	union acpi_object param[2];
	struct acpi_object_list input;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0x02;
	param[1].type = ACPI_TYPE_INTEGER;
	param[1].integer.value = val;
	input.count = 2;
	input.pointer = param;
	return acpi_evaluate_object(handle, "ACMD", &input, NULL);
}

static acpi_status cmpc_get_accel(acpi_handle handle,
				  unsigned char *x,
				  unsigned char *y,
				  unsigned char *z)
{
	union acpi_object param[2];
	struct acpi_object_list input;
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, 0 };
	unsigned char *locs;
	acpi_status status;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0x01;
	param[1].type = ACPI_TYPE_INTEGER;
	input.count = 2;
	input.pointer = param;
	status = acpi_evaluate_object(handle, "ACMD", &input, &output);
	if (ACPI_SUCCESS(status)) {
		union acpi_object *obj;
		obj = output.pointer;
		locs = obj->buffer.pointer;
		*x = locs[0];
		*y = locs[1];
		*z = locs[2];
		kfree(output.pointer);
	}
	return status;
}

static void cmpc_accel_handler(struct acpi_device *dev, u32 event)
{
	if (event == 0x81) {
		unsigned char x, y, z;
		acpi_status status;

		status = cmpc_get_accel(dev->handle, &x, &y, &z);
		if (ACPI_SUCCESS(status)) {
			struct input_dev *inputdev = dev_get_drvdata(&dev->dev);

			input_report_abs(inputdev, ABS_X, x);
			input_report_abs(inputdev, ABS_Y, y);
			input_report_abs(inputdev, ABS_Z, z);
			input_sync(inputdev);
		}
	}
}

static ssize_t cmpc_accel_sensitivity_show(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct acpi_device *acpi;
	struct input_dev *inputdev;
	struct cmpc_accel *accel;

	acpi = to_acpi_device(dev);
	inputdev = dev_get_drvdata(&acpi->dev);
	accel = dev_get_drvdata(&inputdev->dev);

	return sprintf(buf, "%d\n", accel->sensitivity);
}

static ssize_t cmpc_accel_sensitivity_store(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf, size_t count)
{
	struct acpi_device *acpi;
	struct input_dev *inputdev;
	struct cmpc_accel *accel;
	unsigned long sensitivity;
	int r;

	acpi = to_acpi_device(dev);
	inputdev = dev_get_drvdata(&acpi->dev);
	accel = dev_get_drvdata(&inputdev->dev);

	r = strict_strtoul(buf, 0, &sensitivity);
	if (r)
		return r;

	accel->sensitivity = sensitivity;
	cmpc_accel_set_sensitivity(acpi->handle, sensitivity);

	return strnlen(buf, count);
}

static struct device_attribute cmpc_accel_sensitivity_attr = {
	.attr = { .name = "sensitivity", .mode = 0660 },
	.show = cmpc_accel_sensitivity_show,
	.store = cmpc_accel_sensitivity_store
};

static int cmpc_accel_open(struct input_dev *input)
{
	struct acpi_device *acpi;

	acpi = to_acpi_device(input->dev.parent);
	if (ACPI_SUCCESS(cmpc_start_accel(acpi->handle)))
		return 0;
	return -EIO;
}

static void cmpc_accel_close(struct input_dev *input)
{
	struct acpi_device *acpi;

	acpi = to_acpi_device(input->dev.parent);
	cmpc_stop_accel(acpi->handle);
}

static void cmpc_accel_idev_init(struct input_dev *inputdev)
{
	set_bit(EV_ABS, inputdev->evbit);
	input_set_abs_params(inputdev, ABS_X, 0, 255, 8, 0);
	input_set_abs_params(inputdev, ABS_Y, 0, 255, 8, 0);
	input_set_abs_params(inputdev, ABS_Z, 0, 255, 8, 0);
	inputdev->open = cmpc_accel_open;
	inputdev->close = cmpc_accel_close;
}

static int cmpc_accel_add(struct acpi_device *acpi)
{
	int error;
	struct input_dev *inputdev;
	struct cmpc_accel *accel;

	accel = kmalloc(sizeof(*accel), GFP_KERNEL);
	if (!accel)
		return -ENOMEM;

	accel->sensitivity = CMPC_ACCEL_SENSITIVITY_DEFAULT;
	cmpc_accel_set_sensitivity(acpi->handle, accel->sensitivity);

	error = device_create_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
	if (error)
		goto failed_file;

	error = cmpc_add_acpi_notify_device(acpi, "cmpc_accel",
					    cmpc_accel_idev_init);
	if (error)
		goto failed_input;

	inputdev = dev_get_drvdata(&acpi->dev);
	dev_set_drvdata(&inputdev->dev, accel);

	return 0;

failed_input:
	device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
failed_file:
	kfree(accel);
	return error;
}

static int cmpc_accel_remove(struct acpi_device *acpi, int type)
{
	struct input_dev *inputdev;
	struct cmpc_accel *accel;

	inputdev = dev_get_drvdata(&acpi->dev);
	accel = dev_get_drvdata(&inputdev->dev);

	device_remove_file(&acpi->dev, &cmpc_accel_sensitivity_attr);
	return cmpc_remove_acpi_notify_device(acpi);
}

static const struct acpi_device_id cmpc_accel_device_ids[] = {
	{CMPC_ACCEL_HID, 0},
	{"", 0}
};

static struct acpi_driver cmpc_accel_acpi_driver = {
	.owner = THIS_MODULE,
	.name = "cmpc_accel",
	.class = "cmpc_accel",
	.ids = cmpc_accel_device_ids,
	.ops = {
		.add = cmpc_accel_add,
		.remove = cmpc_accel_remove,
		.notify = cmpc_accel_handler,
	}
};


/*
 * Tablet mode code.
 */
static acpi_status cmpc_get_tablet(acpi_handle handle,
				   unsigned long long *value)
{
	union acpi_object param;
	struct acpi_object_list input;
	unsigned long long output;
	acpi_status status;

	param.type = ACPI_TYPE_INTEGER;
	param.integer.value = 0x01;
	input.count = 1;
	input.pointer = &param;
	status = acpi_evaluate_integer(handle, "TCMD", &input, &output);
	if (ACPI_SUCCESS(status))
		*value = output;
	return status;
}

static void cmpc_tablet_handler(struct acpi_device *dev, u32 event)
{
	unsigned long long val = 0;
	struct input_dev *inputdev = dev_get_drvdata(&dev->dev);

	if (event == 0x81) {
		if (ACPI_SUCCESS(cmpc_get_tablet(dev->handle, &val)))
			input_report_switch(inputdev, SW_TABLET_MODE, !val);
	}
}

static void cmpc_tablet_idev_init(struct input_dev *inputdev)
{
	unsigned long long val = 0;
	struct acpi_device *acpi;

	set_bit(EV_SW, inputdev->evbit);
	set_bit(SW_TABLET_MODE, inputdev->swbit);

	acpi = to_acpi_device(inputdev->dev.parent);
	if (ACPI_SUCCESS(cmpc_get_tablet(acpi->handle, &val)))
		input_report_switch(inputdev, SW_TABLET_MODE, !val);
}

static int cmpc_tablet_add(struct acpi_device *acpi)
{
	return cmpc_add_acpi_notify_device(acpi, "cmpc_tablet",
					   cmpc_tablet_idev_init);
}

static int cmpc_tablet_remove(struct acpi_device *acpi, int type)
{
	return cmpc_remove_acpi_notify_device(acpi);
}

static int cmpc_tablet_resume(struct device *dev)
{
	struct input_dev *inputdev = dev_get_drvdata(dev);

	unsigned long long val = 0;
	if (ACPI_SUCCESS(cmpc_get_tablet(to_acpi_device(dev)->handle, &val)))
		input_report_switch(inputdev, SW_TABLET_MODE, !val);
	return 0;
}

static SIMPLE_DEV_PM_OPS(cmpc_tablet_pm, NULL, cmpc_tablet_resume);

static const struct acpi_device_id cmpc_tablet_device_ids[] = {
	{CMPC_TABLET_HID, 0},
	{"", 0}
};

static struct acpi_driver cmpc_tablet_acpi_driver = {
	.owner = THIS_MODULE,
	.name = "cmpc_tablet",
	.class = "cmpc_tablet",
	.ids = cmpc_tablet_device_ids,
	.ops = {
		.add = cmpc_tablet_add,
		.remove = cmpc_tablet_remove,
		.notify = cmpc_tablet_handler,
	},
	.drv.pm = &cmpc_tablet_pm,
};


/*
 * Backlight code.
 */

static acpi_status cmpc_get_brightness(acpi_handle handle,
				       unsigned long long *value)
{
	union acpi_object param;
	struct acpi_object_list input;
	unsigned long long output;
	acpi_status status;

	param.type = ACPI_TYPE_INTEGER;
	param.integer.value = 0xC0;
	input.count = 1;
	input.pointer = &param;
	status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
	if (ACPI_SUCCESS(status))
		*value = output;
	return status;
}

static acpi_status cmpc_set_brightness(acpi_handle handle,
				       unsigned long long value)
{
	union acpi_object param[2];
	struct acpi_object_list input;
	acpi_status status;
	unsigned long long output;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0xC0;
	param[1].type = ACPI_TYPE_INTEGER;
	param[1].integer.value = value;
	input.count = 2;
	input.pointer = param;
	status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
	return status;
}

static int cmpc_bl_get_brightness(struct backlight_device *bd)
{
	acpi_status status;
	acpi_handle handle;
	unsigned long long brightness;

	handle = bl_get_data(bd);
	status = cmpc_get_brightness(handle, &brightness);
	if (ACPI_SUCCESS(status))
		return brightness;
	else
		return -1;
}

static int cmpc_bl_update_status(struct backlight_device *bd)
{
	acpi_status status;
	acpi_handle handle;

	handle = bl_get_data(bd);
	status = cmpc_set_brightness(handle, bd->props.brightness);
	if (ACPI_SUCCESS(status))
		return 0;
	else
		return -1;
}

static const struct backlight_ops cmpc_bl_ops = {
	.get_brightness = cmpc_bl_get_brightness,
	.update_status = cmpc_bl_update_status
};

/*
 * RFKILL code.
 */

static acpi_status cmpc_get_rfkill_wlan(acpi_handle handle,
					unsigned long long *value)
{
	union acpi_object param;
	struct acpi_object_list input;
	unsigned long long output;
	acpi_status status;

	param.type = ACPI_TYPE_INTEGER;
	param.integer.value = 0xC1;
	input.count = 1;
	input.pointer = &param;
	status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
	if (ACPI_SUCCESS(status))
		*value = output;
	return status;
}

static acpi_status cmpc_set_rfkill_wlan(acpi_handle handle,
					unsigned long long value)
{
	union acpi_object param[2];
	struct acpi_object_list input;
	acpi_status status;
	unsigned long long output;

	param[0].type = ACPI_TYPE_INTEGER;
	param[0].integer.value = 0xC1;
	param[1].type = ACPI_TYPE_INTEGER;
	param[1].integer.value = value;
	input.count = 2;
	input.pointer = param;
	status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
	return status;
}

static void cmpc_rfkill_query(struct rfkill *rfkill, void *data)
{
	acpi_status status;
	acpi_handle handle;
	unsigned long long state;
	bool blocked;

	handle = data;
	status = cmpc_get_rfkill_wlan(handle, &state);
	if (ACPI_SUCCESS(status)) {
		blocked = state & 1 ? false : true;
		rfkill_set_sw_state(rfkill, blocked);
	}
}

static int cmpc_rfkill_block(void *data, bool blocked)
{
	acpi_status status;
	acpi_handle handle;
	unsigned long long state;
	bool is_blocked;

	handle = data;
	status = cmpc_get_rfkill_wlan(handle, &state);
	if (ACPI_FAILURE(status))
		return -ENODEV;
	/* Check if we really need to call cmpc_set_rfkill_wlan */
	is_blocked = state & 1 ? false : true;
	if (is_blocked != blocked) {
		state = blocked ? 0 : 1;
		status = cmpc_set_rfkill_wlan(handle, state);
		if (ACPI_FAILURE(status))
			return -ENODEV;
	}
	return 0;
}

static const struct rfkill_ops cmpc_rfkill_ops = {
	.query = cmpc_rfkill_query,
	.set_block = cmpc_rfkill_block,
};

/*
 * Common backlight and rfkill code.
 */

struct ipml200_dev {
	struct backlight_device *bd;
	struct rfkill *rf;
};

static int cmpc_ipml_add(struct acpi_device *acpi)
{
	int retval;
	struct ipml200_dev *ipml;
	struct backlight_properties props;

	ipml = kmalloc(sizeof(*ipml), GFP_KERNEL);
	if (ipml == NULL)
		return -ENOMEM;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = 7;
	ipml->bd = backlight_device_register("cmpc_bl", &acpi->dev,
					     acpi->handle, &cmpc_bl_ops,
					     &props);
	if (IS_ERR(ipml->bd)) {
		retval = PTR_ERR(ipml->bd);
		goto out_bd;
	}

	ipml->rf = rfkill_alloc("cmpc_rfkill", &acpi->dev, RFKILL_TYPE_WLAN,
				&cmpc_rfkill_ops, acpi->handle);
	/*
	 * If RFKILL is disabled, rfkill_alloc will return ERR_PTR(-ENODEV).
	 * This is OK, however, since all other uses of the device will not
	 * derefence it.
	 */
	if (ipml->rf) {
		retval = rfkill_register(ipml->rf);
		if (retval) {
			rfkill_destroy(ipml->rf);
			ipml->rf = NULL;
		}
	}

	dev_set_drvdata(&acpi->dev, ipml);
	return 0;

out_bd:
	kfree(ipml);
	return retval;
}

static int cmpc_ipml_remove(struct acpi_device *acpi, int type)
{
	struct ipml200_dev *ipml;

	ipml = dev_get_drvdata(&acpi->dev);

	backlight_device_unregister(ipml->bd);

	if (ipml->rf) {
		rfkill_unregister(ipml->rf);
		rfkill_destroy(ipml->rf);
	}

	kfree(ipml);

	return 0;
}

static const struct acpi_device_id cmpc_ipml_device_ids[] = {
	{CMPC_IPML_HID, 0},
	{"", 0}
};

static struct acpi_driver cmpc_ipml_acpi_driver = {
	.owner = THIS_MODULE,
	.name = "cmpc",
	.class = "cmpc",
	.ids = cmpc_ipml_device_ids,
	.ops = {
		.add = cmpc_ipml_add,
		.remove = cmpc_ipml_remove
	}
};


/*
 * Extra keys code.
 */
static int cmpc_keys_codes[] = {
	KEY_UNKNOWN,
	KEY_WLAN,
	KEY_SWITCHVIDEOMODE,
	KEY_BRIGHTNESSDOWN,
	KEY_BRIGHTNESSUP,
	KEY_VENDOR,
	KEY_UNKNOWN,
	KEY_CAMERA,
	KEY_BACK,
	KEY_FORWARD,
	KEY_MAX
};

static void cmpc_keys_handler(struct acpi_device *dev, u32 event)
{
	struct input_dev *inputdev;
	int code = KEY_MAX;

	if ((event & 0x0F) < ARRAY_SIZE(cmpc_keys_codes))
		code = cmpc_keys_codes[event & 0x0F];
	inputdev = dev_get_drvdata(&dev->dev);
	input_report_key(inputdev, code, !(event & 0x10));
	input_sync(inputdev);
}

static void cmpc_keys_idev_init(struct input_dev *inputdev)
{
	int i;

	set_bit(EV_KEY, inputdev->evbit);
	for (i = 0; cmpc_keys_codes[i] != KEY_MAX; i++)
		set_bit(cmpc_keys_codes[i], inputdev->keybit);
}

static int cmpc_keys_add(struct acpi_device *acpi)
{
	return cmpc_add_acpi_notify_device(acpi, "cmpc_keys",
					   cmpc_keys_idev_init);
}

static int cmpc_keys_remove(struct acpi_device *acpi, int type)
{
	return cmpc_remove_acpi_notify_device(acpi);
}

static const struct acpi_device_id cmpc_keys_device_ids[] = {
	{CMPC_KEYS_HID, 0},
	{"", 0}
};

static struct acpi_driver cmpc_keys_acpi_driver = {
	.owner = THIS_MODULE,
	.name = "cmpc_keys",
	.class = "cmpc_keys",
	.ids = cmpc_keys_device_ids,
	.ops = {
		.add = cmpc_keys_add,
		.remove = cmpc_keys_remove,
		.notify = cmpc_keys_handler,
	}
};


/*
 * General init/exit code.
 */

static int cmpc_init(void)
{
	int r;

	r = acpi_bus_register_driver(&cmpc_keys_acpi_driver);
	if (r)
		goto failed_keys;

	r = acpi_bus_register_driver(&cmpc_ipml_acpi_driver);
	if (r)
		goto failed_bl;

	r = acpi_bus_register_driver(&cmpc_tablet_acpi_driver);
	if (r)
		goto failed_tablet;

	r = acpi_bus_register_driver(&cmpc_accel_acpi_driver);
	if (r)
		goto failed_accel;

	return r;

failed_accel:
	acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);

failed_tablet:
	acpi_bus_unregister_driver(&cmpc_ipml_acpi_driver);

failed_bl:
	acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);

failed_keys:
	return r;
}

static void cmpc_exit(void)
{
	acpi_bus_unregister_driver(&cmpc_accel_acpi_driver);
	acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
	acpi_bus_unregister_driver(&cmpc_ipml_acpi_driver);
	acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
}

module_init(cmpc_init);
module_exit(cmpc_exit);

static const struct acpi_device_id cmpc_device_ids[] = {
	{CMPC_ACCEL_HID, 0},
	{CMPC_TABLET_HID, 0},
	{CMPC_IPML_HID, 0},
	{CMPC_KEYS_HID, 0},
	{"", 0}
};

MODULE_DEVICE_TABLE(acpi, cmpc_device_ids);