summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/samsung-laptop.c
blob: d347116d150e38146eedf6e817e51afc84898169 (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
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
/*
 * Samsung Laptop driver
 *
 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
 * Copyright (C) 2009,2011 Novell Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/dmi.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>

/*
 * This driver is needed because a number of Samsung laptops do not hook
 * their control settings through ACPI.  So we have to poke around in the
 * BIOS to do things like brightness values, and "special" key controls.
 */

/*
 * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
 * be reserved by the BIOS (which really doesn't make much sense), we tell
 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
 */
#define MAX_BRIGHT	0x07


#define SABI_IFACE_MAIN			0x00
#define SABI_IFACE_SUB			0x02
#define SABI_IFACE_COMPLETE		0x04
#define SABI_IFACE_DATA			0x05

/* Structure to get data back to the calling function */
struct sabi_retval {
	u8 retval[20];
};

struct sabi_header_offsets {
	u8 port;
	u8 re_mem;
	u8 iface_func;
	u8 en_mem;
	u8 data_offset;
	u8 data_segment;
};

struct sabi_commands {
	/*
	 * Brightness is 0 - 8, as described above.
	 * Value 0 is for the BIOS to use
	 */
	u8 get_brightness;
	u8 set_brightness;

	/*
	 * first byte:
	 * 0x00 - wireless is off
	 * 0x01 - wireless is on
	 * second byte:
	 * 0x02 - 3G is off
	 * 0x03 - 3G is on
	 * TODO, verify 3G is correct, that doesn't seem right...
	 */
	u8 get_wireless_button;
	u8 set_wireless_button;

	/* 0 is off, 1 is on */
	u8 get_backlight;
	u8 set_backlight;

	/*
	 * 0x80 or 0x00 - no action
	 * 0x81 - recovery key pressed
	 */
	u8 get_recovery_mode;
	u8 set_recovery_mode;

	/*
	 * on seclinux: 0 is low, 1 is high,
	 * on swsmi: 0 is normal, 1 is silent, 2 is turbo
	 */
	u8 get_performance_level;
	u8 set_performance_level;

	/*
	 * Tell the BIOS that Linux is running on this machine.
	 * 81 is on, 80 is off
	 */
	u8 set_linux;
};

struct sabi_performance_level {
	const char *name;
	u8 value;
};

struct sabi_config {
	const char *test_string;
	u16 main_function;
	const struct sabi_header_offsets header_offsets;
	const struct sabi_commands commands;
	const struct sabi_performance_level performance_levels[4];
	u8 min_brightness;
	u8 max_brightness;
};

static const struct sabi_config sabi_configs[] = {
	{
		.test_string = "SECLINUX",

		.main_function = 0x4c49,

		.header_offsets = {
			.port = 0x00,
			.re_mem = 0x02,
			.iface_func = 0x03,
			.en_mem = 0x04,
			.data_offset = 0x05,
			.data_segment = 0x07,
		},

		.commands = {
			.get_brightness = 0x00,
			.set_brightness = 0x01,

			.get_wireless_button = 0x02,
			.set_wireless_button = 0x03,

			.get_backlight = 0x04,
			.set_backlight = 0x05,

			.get_recovery_mode = 0x06,
			.set_recovery_mode = 0x07,

			.get_performance_level = 0x08,
			.set_performance_level = 0x09,

			.set_linux = 0x0a,
		},

		.performance_levels = {
			{
				.name = "silent",
				.value = 0,
			},
			{
				.name = "normal",
				.value = 1,
			},
			{ },
		},
		.min_brightness = 1,
		.max_brightness = 8,
	},
	{
		.test_string = "SwSmi@",

		.main_function = 0x5843,

		.header_offsets = {
			.port = 0x00,
			.re_mem = 0x04,
			.iface_func = 0x02,
			.en_mem = 0x03,
			.data_offset = 0x05,
			.data_segment = 0x07,
		},

		.commands = {
			.get_brightness = 0x10,
			.set_brightness = 0x11,

			.get_wireless_button = 0x12,
			.set_wireless_button = 0x13,

			.get_backlight = 0x2d,
			.set_backlight = 0x2e,

			.get_recovery_mode = 0xff,
			.set_recovery_mode = 0xff,

			.get_performance_level = 0x31,
			.set_performance_level = 0x32,

			.set_linux = 0xff,
		},

		.performance_levels = {
			{
				.name = "normal",
				.value = 0,
			},
			{
				.name = "silent",
				.value = 1,
			},
			{
				.name = "overclock",
				.value = 2,
			},
			{ },
		},
		.min_brightness = 0,
		.max_brightness = 8,
	},
	{ },
};

static const struct sabi_config *sabi_config;

static void __iomem *sabi;
static void __iomem *sabi_iface;
static void __iomem *f0000_segment;
static struct backlight_device *backlight_device;
static struct mutex sabi_mutex;
static struct platform_device *sdev;
static struct rfkill *rfk;

static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force,
		"Disable the DMI check and forces the driver to be loaded");

static int debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");

static int sabi_get_command(u8 command, struct sabi_retval *sretval)
{
	int retval = 0;
	u16 port = readw(sabi + sabi_config->header_offsets.port);
	u8 complete, iface_data;

	mutex_lock(&sabi_mutex);

	/* enable memory to be able to write to it */
	outb(readb(sabi + sabi_config->header_offsets.en_mem), port);

	/* write out the command */
	writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
	writew(command, sabi_iface + SABI_IFACE_SUB);
	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
	outb(readb(sabi + sabi_config->header_offsets.iface_func), port);

	/* write protect memory to make it safe */
	outb(readb(sabi + sabi_config->header_offsets.re_mem), port);

	/* see if the command actually succeeded */
	complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
	iface_data = readb(sabi_iface + SABI_IFACE_DATA);
	if (complete != 0xaa || iface_data == 0xff) {
		pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
		        command, complete, iface_data);
		retval = -EINVAL;
		goto exit;
	}
	/*
	 * Save off the data into a structure so the caller use it.
	 * Right now we only want the first 4 bytes,
	 * There are commands that need more, but not for the ones we
	 * currently care about.
	 */
	sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
	sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
	sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
	sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);

exit:
	mutex_unlock(&sabi_mutex);
	return retval;

}

static int sabi_set_command(u8 command, u8 data)
{
	int retval = 0;
	u16 port = readw(sabi + sabi_config->header_offsets.port);
	u8 complete, iface_data;

	mutex_lock(&sabi_mutex);

	/* enable memory to be able to write to it */
	outb(readb(sabi + sabi_config->header_offsets.en_mem), port);

	/* write out the command */
	writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
	writew(command, sabi_iface + SABI_IFACE_SUB);
	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
	writeb(data, sabi_iface + SABI_IFACE_DATA);
	outb(readb(sabi + sabi_config->header_offsets.iface_func), port);

	/* write protect memory to make it safe */
	outb(readb(sabi + sabi_config->header_offsets.re_mem), port);

	/* see if the command actually succeeded */
	complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
	iface_data = readb(sabi_iface + SABI_IFACE_DATA);
	if (complete != 0xaa || iface_data == 0xff) {
		pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
		       command, complete, iface_data);
		retval = -EINVAL;
	}

	mutex_unlock(&sabi_mutex);
	return retval;
}

static void test_backlight(void)
{
	struct sabi_retval sretval;

	sabi_get_command(sabi_config->commands.get_backlight, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);

	sabi_set_command(sabi_config->commands.set_backlight, 0);
	printk(KERN_DEBUG "backlight should be off\n");

	sabi_get_command(sabi_config->commands.get_backlight, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);

	msleep(1000);

	sabi_set_command(sabi_config->commands.set_backlight, 1);
	printk(KERN_DEBUG "backlight should be on\n");

	sabi_get_command(sabi_config->commands.get_backlight, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
}

static void test_wireless(void)
{
	struct sabi_retval sretval;

	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);

	sabi_set_command(sabi_config->commands.set_wireless_button, 0);
	printk(KERN_DEBUG "wireless led should be off\n");

	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);

	msleep(1000);

	sabi_set_command(sabi_config->commands.set_wireless_button, 1);
	printk(KERN_DEBUG "wireless led should be on\n");

	sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
}

static u8 read_brightness(void)
{
	struct sabi_retval sretval;
	int user_brightness = 0;
	int retval;

	retval = sabi_get_command(sabi_config->commands.get_brightness,
				  &sretval);
	if (!retval) {
		user_brightness = sretval.retval[0];
		if (user_brightness != 0)
			user_brightness -= sabi_config->min_brightness;
	}
	return user_brightness;
}

static void set_brightness(u8 user_brightness)
{
	u8 user_level = user_brightness - sabi_config->min_brightness;

	sabi_set_command(sabi_config->commands.set_brightness, user_level);
}

static int get_brightness(struct backlight_device *bd)
{
	return (int)read_brightness();
}

static int update_status(struct backlight_device *bd)
{
	set_brightness(bd->props.brightness);

	if (bd->props.power == FB_BLANK_UNBLANK)
		sabi_set_command(sabi_config->commands.set_backlight, 1);
	else
		sabi_set_command(sabi_config->commands.set_backlight, 0);
	return 0;
}

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

static int rfkill_set(void *data, bool blocked)
{
	/* Do something with blocked...*/
	/*
	 * blocked == false is on
	 * blocked == true is off
	 */
	if (blocked)
		sabi_set_command(sabi_config->commands.set_wireless_button, 0);
	else
		sabi_set_command(sabi_config->commands.set_wireless_button, 1);

	return 0;
}

static struct rfkill_ops rfkill_ops = {
	.set_block = rfkill_set,
};

static int init_wireless(struct platform_device *sdev)
{
	int retval;

	rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
			   &rfkill_ops, NULL);
	if (!rfk)
		return -ENOMEM;

	retval = rfkill_register(rfk);
	if (retval) {
		rfkill_destroy(rfk);
		return -ENODEV;
	}

	return 0;
}

static void destroy_wireless(void)
{
	rfkill_unregister(rfk);
	rfkill_destroy(rfk);
}

static ssize_t get_performance_level(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct sabi_retval sretval;
	int retval;
	int i;

	/* Read the state */
	retval = sabi_get_command(sabi_config->commands.get_performance_level,
				  &sretval);
	if (retval)
		return retval;

	/* The logic is backwards, yeah, lots of fun... */
	for (i = 0; sabi_config->performance_levels[i].name; ++i) {
		if (sretval.retval[0] == sabi_config->performance_levels[i].value)
			return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name);
	}
	return sprintf(buf, "%s\n", "unknown");
}

static ssize_t set_performance_level(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	if (count >= 1) {
		int i;
		for (i = 0; sabi_config->performance_levels[i].name; ++i) {
			const struct sabi_performance_level *level =
				&sabi_config->performance_levels[i];
			if (!strncasecmp(level->name, buf, strlen(level->name))) {
				sabi_set_command(sabi_config->commands.set_performance_level,
						 level->value);
				break;
			}
		}
		if (!sabi_config->performance_levels[i].name)
			return -EINVAL;
	}
	return count;
}
static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
		   get_performance_level, set_performance_level);


static int __init dmi_check_cb(const struct dmi_system_id *id)
{
	pr_info("found laptop model '%s'\n",
		id->ident);
	return 1;
}

static struct dmi_system_id __initdata samsung_dmi_table[] = {
	{
		.ident = "N128",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
			DMI_MATCH(DMI_BOARD_NAME, "N128"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "N130",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
			DMI_MATCH(DMI_BOARD_NAME, "N130"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "X125",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X125"),
			DMI_MATCH(DMI_BOARD_NAME, "X125"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "X120/X170",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),
			DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "NC10",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
			DMI_MATCH(DMI_BOARD_NAME, "NC10"),
		},
		.callback = dmi_check_cb,
	},
		{
		.ident = "NP-Q45",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
			DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
		},
		.callback = dmi_check_cb,
		},
	{
		.ident = "X360",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
			DMI_MATCH(DMI_BOARD_NAME, "X360"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "R410 Plus",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "R410P"),
			DMI_MATCH(DMI_BOARD_NAME, "R460"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "R518",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
			DMI_MATCH(DMI_BOARD_NAME, "R518"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "R519/R719",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),
			DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "N150/N210/N220/N230",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"),
			DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "N150P/N210P/N220P",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
			DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "R530/R730",
		.matches = {
		      DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
		      DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),
		      DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "NF110/NF210/NF310",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
			DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "N145P/N250P/N260P",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
			DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "R70/R71",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),
			DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "P460",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "P460"),
			DMI_MATCH(DMI_BOARD_NAME, "P460"),
		},
		.callback = dmi_check_cb,
	},
	{ },
};
MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);

static int find_signature(void __iomem *memcheck, const char *testStr)
{
	int i = 0;
	int loca;

	for (loca = 0; loca < 0xffff; loca++) {
		char temp = readb(memcheck + loca);

		if (temp == testStr[i]) {
			if (i == strlen(testStr)-1)
				break;
			++i;
		} else {
			i = 0;
		}
	}
	return loca;
}

static int __init samsung_init(void)
{
	struct backlight_properties props;
	struct sabi_retval sretval;
	unsigned int ifaceP;
	int i;
	int loca;
	int retval;

	mutex_init(&sabi_mutex);

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

	f0000_segment = ioremap_nocache(0xf0000, 0xffff);
	if (!f0000_segment) {
		pr_err("Can't map the segment at 0xf0000\n");
		return -EINVAL;
	}

	/* Try to find one of the signatures in memory to find the header */
	for (i = 0; sabi_configs[i].test_string != 0; ++i) {
		sabi_config = &sabi_configs[i];
		loca = find_signature(f0000_segment, sabi_config->test_string);
		if (loca != 0xffff)
			break;
	}

	if (loca == 0xffff) {
		pr_err("This computer does not support SABI\n");
		goto error_no_signature;
	}

	/* point to the SMI port Number */
	loca += 1;
	sabi = (f0000_segment + loca);

	if (debug) {
		printk(KERN_DEBUG "This computer supports SABI==%x\n",
			loca + 0xf0000 - 6);
		printk(KERN_DEBUG "SABI header:\n");
		printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
			readw(sabi + sabi_config->header_offsets.port));
		printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
			readb(sabi + sabi_config->header_offsets.iface_func));
		printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
			readb(sabi + sabi_config->header_offsets.en_mem));
		printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
			readb(sabi + sabi_config->header_offsets.re_mem));
		printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
			readw(sabi + sabi_config->header_offsets.data_offset));
		printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
			readw(sabi + sabi_config->header_offsets.data_segment));
	}

	/* Get a pointer to the SABI Interface */
	ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;
	ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;
	sabi_iface = ioremap_nocache(ifaceP, 16);
	if (!sabi_iface) {
		pr_err("Can't remap %x\n", ifaceP);
		goto exit;
	}
	if (debug) {
		printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
		printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);

		test_backlight();
		test_wireless();

		retval = sabi_get_command(sabi_config->commands.get_brightness,
					  &sretval);
		printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
	}

	/* Turn on "Linux" mode in the BIOS */
	if (sabi_config->commands.set_linux != 0xff) {
		retval = sabi_set_command(sabi_config->commands.set_linux,
					  0x81);
		if (retval) {
			pr_warn("Linux mode was not set!\n");
			goto error_no_platform;
		}
	}

	/* knock up a platform device to hang stuff off of */
	sdev = platform_device_register_simple("samsung", -1, NULL, 0);
	if (IS_ERR(sdev))
		goto error_no_platform;

	/* create a backlight device to talk to this one */
	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = sabi_config->max_brightness;
	backlight_device = backlight_device_register("samsung", &sdev->dev,
						     NULL, &backlight_ops,
						     &props);
	if (IS_ERR(backlight_device))
		goto error_no_backlight;

	backlight_device->props.brightness = read_brightness();
	backlight_device->props.power = FB_BLANK_UNBLANK;
	backlight_update_status(backlight_device);

	retval = init_wireless(sdev);
	if (retval)
		goto error_no_rfk;

	retval = device_create_file(&sdev->dev, &dev_attr_performance_level);
	if (retval)
		goto error_file_create;

exit:
	return 0;

error_file_create:
	destroy_wireless();

error_no_rfk:
	backlight_device_unregister(backlight_device);

error_no_backlight:
	platform_device_unregister(sdev);

error_no_platform:
	iounmap(sabi_iface);

error_no_signature:
	iounmap(f0000_segment);
	return -EINVAL;
}

static void __exit samsung_exit(void)
{
	/* Turn off "Linux" mode in the BIOS */
	if (sabi_config->commands.set_linux != 0xff)
		sabi_set_command(sabi_config->commands.set_linux, 0x80);

	device_remove_file(&sdev->dev, &dev_attr_performance_level);
	backlight_device_unregister(backlight_device);
	destroy_wireless();
	iounmap(sabi_iface);
	iounmap(f0000_segment);
	platform_device_unregister(sdev);
}

module_init(samsung_init);
module_exit(samsung_exit);

MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
MODULE_DESCRIPTION("Samsung Backlight driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud