1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Samsung Laptop driver
4	*
5	* Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
6	* Copyright (C) 2009,2011 Novell Inc.
7	*/
8	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10	#include <linux/kernel.h>
11	#include <linux/init.h>
12	#include <linux/module.h>
13	#include <linux/delay.h>
14	#include <linux/pci.h>
15	#include <linux/backlight.h>
16	#include <linux/leds.h>
17	#include <linux/fb.h>
18	#include <linux/dmi.h>
19	#include <linux/platform_device.h>
20	#include <linux/rfkill.h>
21	#include <linux/acpi.h>
22	#include <linux/seq_file.h>
23	#include <linux/debugfs.h>
24	#include <linux/ctype.h>
25	#include <linux/efi.h>
26	#include <linux/suspend.h>
27	#include <acpi/video.h>
28
29	/*
30	* This driver is needed because a number of Samsung laptops do not hook
31	* their control settings through ACPI. So we have to poke around in the
32	* BIOS to do things like brightness values, and "special" key controls.
33	*/
34
35	/*
36	* We have 0 - 8 as valid brightness levels. The specs say that level 0 should
37	* be reserved by the BIOS (which really doesn't make much sense), we tell
38	* userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
39	*/
40	#define MAX_BRIGHT 0x07
41
42
43	#define SABI_IFACE_MAIN 0x00
44	#define SABI_IFACE_SUB 0x02
45	#define SABI_IFACE_COMPLETE 0x04
46	#define SABI_IFACE_DATA 0x05
47
48	#define WL_STATUS_WLAN 0x0
49	#define WL_STATUS_BT 0x2
50
51	/* Structure get/set data using sabi */
52	struct sabi_data {
53	union {
54	struct {
55	u32 d0;
56	u32 d1;
57	u16 d2;
58	u8 d3;
59	};
60	u8 data[11];
61	};
62	};
63
64	struct sabi_header_offsets {
65	u8 port;
66	u8 re_mem;
67	u8 iface_func;
68	u8 en_mem;
69	u8 data_offset;
70	u8 data_segment;
71	};
72
73	struct sabi_commands {
74	/*
75	* Brightness is 0 - 8, as described above.
76	* Value 0 is for the BIOS to use
77	*/
78	u16 get_brightness;
79	u16 set_brightness;
80
81	/*
82	* first byte:
83	* 0x00 - wireless is off
84	* 0x01 - wireless is on
85	* second byte:
86	* 0x02 - 3G is off
87	* 0x03 - 3G is on
88	* TODO, verify 3G is correct, that doesn't seem right...
89	*/
90	u16 get_wireless_button;
91	u16 set_wireless_button;
92
93	/* 0 is off, 1 is on */
94	u16 get_backlight;
95	u16 set_backlight;
96
97	/*
98	* 0x80 or 0x00 - no action
99	* 0x81 - recovery key pressed
100	*/
101	u16 get_recovery_mode;
102	u16 set_recovery_mode;
103
104	/*
105	* on seclinux: 0 is low, 1 is high,
106	* on swsmi: 0 is normal, 1 is silent, 2 is turbo
107	*/
108	u16 get_performance_level;
109	u16 set_performance_level;
110
111	/* 0x80 is off, 0x81 is on */
112	u16 get_battery_life_extender;
113	u16 set_battery_life_extender;
114
115	/* 0x80 is off, 0x81 is on */
116	u16 get_usb_charge;
117	u16 set_usb_charge;
118
119	/* the first byte is for bluetooth and the third one is for wlan */
120	u16 get_wireless_status;
121	u16 set_wireless_status;
122
123	/* 0x80 is off, 0x81 is on */
124	u16 get_lid_handling;
125	u16 set_lid_handling;
126
127	/* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
128	u16 kbd_backlight;
129
130	/*
131	* Tell the BIOS that Linux is running on this machine.
132	* 81 is on, 80 is off
133	*/
134	u16 set_linux;
135	};
136
137	struct sabi_performance_level {
138	const char *name;
139	u16 value;
140	};
141
142	struct sabi_config {
143	int sabi_version;
144	const char *test_string;
145	u16 main_function;
146	const struct sabi_header_offsets header_offsets;
147	const struct sabi_commands commands;
148	const struct sabi_performance_level performance_levels[4];
149	u8 min_brightness;
150	u8 max_brightness;
151	};
152
153	static const struct sabi_config sabi_configs[] = {
154	{
155	/* I don't know if it is really 2, but it is
156	* less than 3 anyway */
157	.sabi_version = 2,
158
159	.test_string = "SECLINUX",
160
161	.main_function = 0x4c49,
162
163	.header_offsets = {
164	.port = 0x00,
165	.re_mem = 0x02,
166	.iface_func = 0x03,
167	.en_mem = 0x04,
168	.data_offset = 0x05,
169	.data_segment = 0x07,
170	},
171
172	.commands = {
173	.get_brightness = 0x00,
174	.set_brightness = 0x01,
175
176	.get_wireless_button = 0x02,
177	.set_wireless_button = 0x03,
178
179	.get_backlight = 0x04,
180	.set_backlight = 0x05,
181
182	.get_recovery_mode = 0x06,
183	.set_recovery_mode = 0x07,
184
185	.get_performance_level = 0x08,
186	.set_performance_level = 0x09,
187
188	.get_battery_life_extender = 0xFFFF,
189	.set_battery_life_extender = 0xFFFF,
190
191	.get_usb_charge = 0xFFFF,
192	.set_usb_charge = 0xFFFF,
193
194	.get_wireless_status = 0xFFFF,
195	.set_wireless_status = 0xFFFF,
196
197	.get_lid_handling = 0xFFFF,
198	.set_lid_handling = 0xFFFF,
199
200	.kbd_backlight = 0xFFFF,
201
202	.set_linux = 0x0a,
203	},
204
205	.performance_levels = {
206	{
207	.name = "silent",
208	.value = 0,
209	},
210	{
211	.name = "normal",
212	.value = 1,
213	},
214	{ },
215	},
216	.min_brightness = 1,
217	.max_brightness = 8,
218	},
219	{
220	.sabi_version = 3,
221
222	.test_string = "SwSmi@",
223
224	.main_function = 0x5843,
225
226	.header_offsets = {
227	.port = 0x00,
228	.re_mem = 0x04,
229	.iface_func = 0x02,
230	.en_mem = 0x03,
231	.data_offset = 0x05,
232	.data_segment = 0x07,
233	},
234
235	.commands = {
236	.get_brightness = 0x10,
237	.set_brightness = 0x11,
238
239	.get_wireless_button = 0x12,
240	.set_wireless_button = 0x13,
241
242	.get_backlight = 0x2d,
243	.set_backlight = 0x2e,
244
245	.get_recovery_mode = 0xff,
246	.set_recovery_mode = 0xff,
247
248	.get_performance_level = 0x31,
249	.set_performance_level = 0x32,
250
251	.get_battery_life_extender = 0x65,
252	.set_battery_life_extender = 0x66,
253
254	.get_usb_charge = 0x67,
255	.set_usb_charge = 0x68,
256
257	.get_wireless_status = 0x69,
258	.set_wireless_status = 0x6a,
259
260	.get_lid_handling = 0x6d,
261	.set_lid_handling = 0x6e,
262
263	.kbd_backlight = 0x78,
264
265	.set_linux = 0xff,
266	},
267
268	.performance_levels = {
269	{
270	.name = "normal",
271	.value = 0,
272	},
273	{
274	.name = "silent",
275	.value = 1,
276	},
277	{
278	.name = "overclock",
279	.value = 2,
280	},
281	{ },
282	},
283	.min_brightness = 0,
284	.max_brightness = 8,
285	},
286	{ },
287	};
288
289	/*
290	* samsung-laptop/ - debugfs root directory
291	* f0000_segment - dump f0000 segment
292	* command - current command
293	* data - current data
294	* d0, d1, d2, d3 - data fields
295	* call - call SABI using command and data
296	*
297	* This allow to call arbitrary sabi commands wihout
298	* modifying the driver at all.
299	* For example, setting the keyboard backlight brightness to 5
300	*
301	* echo 0x78 > command
302	* echo 0x0582 > d0
303	* echo 0 > d1
304	* echo 0 > d2
305	* echo 0 > d3
306	* cat call
307	*/
308
309	struct samsung_laptop_debug {
310	struct dentry *root;
311	struct sabi_data data;
312	u16 command;
313
314	struct debugfs_blob_wrapper f0000_wrapper;
315	struct debugfs_blob_wrapper data_wrapper;
316	struct debugfs_blob_wrapper sdiag_wrapper;
317	};
318
319	struct samsung_laptop;
320
321	struct samsung_rfkill {
322	struct samsung_laptop *samsung;
323	struct rfkill *rfkill;
324	enum rfkill_type type;
325	};
326
327	struct samsung_laptop {
328	const struct sabi_config *config;
329
330	void __iomem *sabi;
331	void __iomem *sabi_iface;
332	void __iomem *f0000_segment;
333
334	struct mutex sabi_mutex;
335
336	struct platform_device *platform_device;
337	struct backlight_device *backlight_device;
338
339	struct samsung_rfkill wlan;
340	struct samsung_rfkill bluetooth;
341
342	struct led_classdev kbd_led;
343	int kbd_led_wk;
344	struct workqueue_struct *led_workqueue;
345	struct work_struct kbd_led_work;
346
347	struct samsung_laptop_debug debug;
348	struct samsung_quirks *quirks;
349
350	struct notifier_block pm_nb;
351
352	bool handle_backlight;
353	bool has_stepping_quirk;
354
355	char sdiag[64];
356	};
357
358	struct samsung_quirks {
359	bool four_kbd_backlight_levels;
360	bool enable_kbd_backlight;
361	bool lid_handling;
362	};
363
364	static struct samsung_quirks samsung_unknown = {};
365
366	static struct samsung_quirks samsung_np740u3e = {
367	.four_kbd_backlight_levels = true,
368	.enable_kbd_backlight = true,
369	};
370
371	static struct samsung_quirks samsung_lid_handling = {
372	.lid_handling = true,
373	};
374
375	static bool force;
376	module_param(force, bool, 0);
377	MODULE_PARM_DESC(force,
378	"Disable the DMI check and forces the driver to be loaded");
379
380	static bool debug;
381	module_param(debug, bool, 0644);
382	MODULE_PARM_DESC(debug, "Debug enabled or not");
383
384	static int sabi_command(struct samsung_laptop *samsung, u16 command,
385	struct sabi_data *in,
386	struct sabi_data *out)
387	{
388	const struct sabi_config *config = samsung->config;
389	int ret = 0;
390	u16 port = readw(addr: samsung->sabi + config->header_offsets.port);
391	u8 complete, iface_data;
392
393	mutex_lock(&samsung->sabi_mutex);
394
395	if (debug) {
396	if (in)
397	pr_info("SABI command:0x%04x "
398	"data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
399	command, in->d0, in->d1, in->d2, in->d3);
400	else
401	pr_info("SABI command:0x%04x", command);
402	}
403
404	/* enable memory to be able to write to it */
405	outb(readb(addr: samsung->sabi + config->header_offsets.en_mem), port);
406
407	/* write out the command */
408	writew(val: config->main_function, addr: samsung->sabi_iface + SABI_IFACE_MAIN);
409	writew(val: command, addr: samsung->sabi_iface + SABI_IFACE_SUB);
410	writeb(val: 0, addr: samsung->sabi_iface + SABI_IFACE_COMPLETE);
411	if (in) {
412	writel(val: in->d0, addr: samsung->sabi_iface + SABI_IFACE_DATA);
413	writel(val: in->d1, addr: samsung->sabi_iface + SABI_IFACE_DATA + 4);
414	writew(val: in->d2, addr: samsung->sabi_iface + SABI_IFACE_DATA + 8);
415	writeb(val: in->d3, addr: samsung->sabi_iface + SABI_IFACE_DATA + 10);
416	}
417	outb(readb(addr: samsung->sabi + config->header_offsets.iface_func), port);
418
419	/* write protect memory to make it safe */
420	outb(readb(addr: samsung->sabi + config->header_offsets.re_mem), port);
421
422	/* see if the command actually succeeded */
423	complete = readb(addr: samsung->sabi_iface + SABI_IFACE_COMPLETE);
424	iface_data = readb(addr: samsung->sabi_iface + SABI_IFACE_DATA);
425
426	/* iface_data = 0xFF happens when a command is not known
427	* so we only add a warning in debug mode since we will
428	* probably issue some unknown command at startup to find
429	* out which features are supported */
430	if (complete != 0xaa || (iface_data == 0xff && debug))
431	pr_warn("SABI command 0x%04x failed with"
432	" completion flag 0x%02x and interface data 0x%02x",
433	command, complete, iface_data);
434
435	if (complete != 0xaa || iface_data == 0xff) {
436	ret = -EINVAL;
437	goto exit;
438	}
439
440	if (out) {
441	out->d0 = readl(addr: samsung->sabi_iface + SABI_IFACE_DATA);
442	out->d1 = readl(addr: samsung->sabi_iface + SABI_IFACE_DATA + 4);
443	out->d2 = readw(addr: samsung->sabi_iface + SABI_IFACE_DATA + 2);
444	out->d3 = readb(addr: samsung->sabi_iface + SABI_IFACE_DATA + 1);
445	}
446
447	if (debug && out) {
448	pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
449	out->d0, out->d1, out->d2, out->d3);
450	}
451
452	exit:
453	mutex_unlock(lock: &samsung->sabi_mutex);
454	return ret;
455	}
456
457	/* simple wrappers usable with most commands */
458	static int sabi_set_commandb(struct samsung_laptop *samsung,
459	u16 command, u8 data)
460	{
461	struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
462
463	in.data[0] = data;
464	return sabi_command(samsung, command, in: &in, NULL);
465	}
466
467	static int read_brightness(struct samsung_laptop *samsung)
468	{
469	const struct sabi_config *config = samsung->config;
470	const struct sabi_commands *commands = &samsung->config->commands;
471	struct sabi_data sretval;
472	int user_brightness = 0;
473	int retval;
474
475	retval = sabi_command(samsung, command: commands->get_brightness,
476	NULL, out: &sretval);
477	if (retval)
478	return retval;
479
480	user_brightness = sretval.data[0];
481	if (user_brightness > config->min_brightness)
482	user_brightness -= config->min_brightness;
483	else
484	user_brightness = 0;
485
486	return user_brightness;
487	}
488
489	static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
490	{
491	const struct sabi_config *config = samsung->config;
492	const struct sabi_commands *commands = &samsung->config->commands;
493	u8 user_level = user_brightness + config->min_brightness;
494
495	if (samsung->has_stepping_quirk && user_level != 0) {
496	/*
497	* short circuit if the specified level is what's already set
498	* to prevent the screen from flickering needlessly
499	*/
500	if (user_brightness == read_brightness(samsung))
501	return;
502
503	sabi_set_commandb(samsung, command: commands->set_brightness, data: 0);
504	}
505
506	sabi_set_commandb(samsung, command: commands->set_brightness, data: user_level);
507	}
508
509	static int get_brightness(struct backlight_device *bd)
510	{
511	struct samsung_laptop *samsung = bl_get_data(bl_dev: bd);
512
513	return read_brightness(samsung);
514	}
515
516	static void check_for_stepping_quirk(struct samsung_laptop *samsung)
517	{
518	int initial_level;
519	int check_level;
520	int orig_level = read_brightness(samsung);
521
522	/*
523	* Some laptops exhibit the strange behaviour of stepping toward
524	* (rather than setting) the brightness except when changing to/from
525	* brightness level 0. This behaviour is checked for here and worked
526	* around in set_brightness.
527	*/
528
529	if (orig_level == 0)
530	set_brightness(samsung, user_brightness: 1);
531
532	initial_level = read_brightness(samsung);
533
534	if (initial_level <= 2)
535	check_level = initial_level + 2;
536	else
537	check_level = initial_level - 2;
538
539	samsung->has_stepping_quirk = false;
540	set_brightness(samsung, user_brightness: check_level);
541
542	if (read_brightness(samsung) != check_level) {
543	samsung->has_stepping_quirk = true;
544	pr_info("enabled workaround for brightness stepping quirk\n");
545	}
546
547	set_brightness(samsung, user_brightness: orig_level);
548	}
549
550	static int update_status(struct backlight_device *bd)
551	{
552	struct samsung_laptop *samsung = bl_get_data(bl_dev: bd);
553	const struct sabi_commands *commands = &samsung->config->commands;
554
555	set_brightness(samsung, user_brightness: bd->props.brightness);
556
557	if (bd->props.power == FB_BLANK_UNBLANK)
558	sabi_set_commandb(samsung, command: commands->set_backlight, data: 1);
559	else
560	sabi_set_commandb(samsung, command: commands->set_backlight, data: 0);
561
562	return 0;
563	}
564
565	static const struct backlight_ops backlight_ops = {
566	.get_brightness = get_brightness,
567	.update_status = update_status,
568	};
569
570	static int seclinux_rfkill_set(void *data, bool blocked)
571	{
572	struct samsung_rfkill *srfkill = data;
573	struct samsung_laptop *samsung = srfkill->samsung;
574	const struct sabi_commands *commands = &samsung->config->commands;
575
576	return sabi_set_commandb(samsung, command: commands->set_wireless_button,
577	data: !blocked);
578	}
579
580	static const struct rfkill_ops seclinux_rfkill_ops = {
581	.set_block = seclinux_rfkill_set,
582	};
583
584	static int swsmi_wireless_status(struct samsung_laptop *samsung,
585	struct sabi_data *data)
586	{
587	const struct sabi_commands *commands = &samsung->config->commands;
588
589	return sabi_command(samsung, command: commands->get_wireless_status,
590	NULL, out: data);
591	}
592
593	static int swsmi_rfkill_set(void *priv, bool blocked)
594	{
595	struct samsung_rfkill *srfkill = priv;
596	struct samsung_laptop *samsung = srfkill->samsung;
597	const struct sabi_commands *commands = &samsung->config->commands;
598	struct sabi_data data;
599	int ret, i;
600
601	ret = swsmi_wireless_status(samsung, data: &data);
602	if (ret)
603	return ret;
604
605	/* Don't set the state for non-present devices */
606	for (i = 0; i < 4; i++)
607	if (data.data[i] == 0x02)
608	data.data[1] = 0;
609
610	if (srfkill->type == RFKILL_TYPE_WLAN)
611	data.data[WL_STATUS_WLAN] = !blocked;
612	else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
613	data.data[WL_STATUS_BT] = !blocked;
614
615	return sabi_command(samsung, command: commands->set_wireless_status,
616	in: &data, out: &data);
617	}
618
619	static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
620	{
621	struct samsung_rfkill *srfkill = priv;
622	struct samsung_laptop *samsung = srfkill->samsung;
623	struct sabi_data data;
624	int ret;
625
626	ret = swsmi_wireless_status(samsung, data: &data);
627	if (ret)
628	return ;
629
630	if (srfkill->type == RFKILL_TYPE_WLAN)
631	ret = data.data[WL_STATUS_WLAN];
632	else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
633	ret = data.data[WL_STATUS_BT];
634	else
635	return ;
636
637	rfkill_set_sw_state(rfkill, blocked: !ret);
638	}
639
640	static const struct rfkill_ops swsmi_rfkill_ops = {
641	.set_block = swsmi_rfkill_set,
642	.query = swsmi_rfkill_query,
643	};
644
645	static ssize_t get_performance_level(struct device *dev,
646	struct device_attribute *attr, char *buf)
647	{
648	struct samsung_laptop *samsung = dev_get_drvdata(dev);
649	const struct sabi_config *config = samsung->config;
650	const struct sabi_commands *commands = &config->commands;
651	struct sabi_data sretval;
652	int retval;
653	int i;
654
655	/* Read the state */
656	retval = sabi_command(samsung, command: commands->get_performance_level,
657	NULL, out: &sretval);
658	if (retval)
659	return retval;
660
661	/* The logic is backwards, yeah, lots of fun... */
662	for (i = 0; config->performance_levels[i].name; ++i) {
663	if (sretval.data[0] == config->performance_levels[i].value)
664	return sprintf(buf, fmt: "%s\n", config->performance_levels[i].name);
665	}
666	return sprintf(buf, fmt: "%s\n", "unknown");
667	}
668
669	static ssize_t set_performance_level(struct device *dev,
670	struct device_attribute *attr, const char *buf,
671	size_t count)
672	{
673	struct samsung_laptop *samsung = dev_get_drvdata(dev);
674	const struct sabi_config *config = samsung->config;
675	const struct sabi_commands *commands = &config->commands;
676	int i;
677
678	if (count < 1)
679	return count;
680
681	for (i = 0; config->performance_levels[i].name; ++i) {
682	const struct sabi_performance_level *level =
683	&config->performance_levels[i];
684	if (!strncasecmp(s1: level->name, s2: buf, strlen(level->name))) {
685	sabi_set_commandb(samsung,
686	command: commands->set_performance_level,
687	data: level->value);
688	break;
689	}
690	}
691
692	if (!config->performance_levels[i].name)
693	return -EINVAL;
694
695	return count;
696	}
697
698	static DEVICE_ATTR(performance_level, 0644,
699	get_performance_level, set_performance_level);
700
701	static int read_battery_life_extender(struct samsung_laptop *samsung)
702	{
703	const struct sabi_commands *commands = &samsung->config->commands;
704	struct sabi_data data;
705	int retval;
706
707	if (commands->get_battery_life_extender == 0xFFFF)
708	return -ENODEV;
709
710	memset(&data, 0, sizeof(data));
711	data.data[0] = 0x80;
712	retval = sabi_command(samsung, command: commands->get_battery_life_extender,
713	in: &data, out: &data);
714
715	if (retval)
716	return retval;
717
718	if (data.data[0] != 0 && data.data[0] != 1)
719	return -ENODEV;
720
721	return data.data[0];
722	}
723
724	static int write_battery_life_extender(struct samsung_laptop *samsung,
725	int enabled)
726	{
727	const struct sabi_commands *commands = &samsung->config->commands;
728	struct sabi_data data;
729
730	memset(&data, 0, sizeof(data));
731	data.data[0] = 0x80 | enabled;
732	return sabi_command(samsung, command: commands->set_battery_life_extender,
733	in: &data, NULL);
734	}
735
736	static ssize_t get_battery_life_extender(struct device *dev,
737	struct device_attribute *attr,
738	char *buf)
739	{
740	struct samsung_laptop *samsung = dev_get_drvdata(dev);
741	int ret;
742
743	ret = read_battery_life_extender(samsung);
744	if (ret < 0)
745	return ret;
746
747	return sprintf(buf, fmt: "%d\n", ret);
748	}
749
750	static ssize_t set_battery_life_extender(struct device *dev,
751	struct device_attribute *attr,
752	const char *buf, size_t count)
753	{
754	struct samsung_laptop *samsung = dev_get_drvdata(dev);
755	int ret, value;
756
757	if (!count || kstrtoint(s: buf, base: 0, res: &value) != 0)
758	return -EINVAL;
759
760	ret = write_battery_life_extender(samsung, enabled: !!value);
761	if (ret < 0)
762	return ret;
763
764	return count;
765	}
766
767	static DEVICE_ATTR(battery_life_extender, 0644,
768	get_battery_life_extender, set_battery_life_extender);
769
770	static int read_usb_charge(struct samsung_laptop *samsung)
771	{
772	const struct sabi_commands *commands = &samsung->config->commands;
773	struct sabi_data data;
774	int retval;
775
776	if (commands->get_usb_charge == 0xFFFF)
777	return -ENODEV;
778
779	memset(&data, 0, sizeof(data));
780	data.data[0] = 0x80;
781	retval = sabi_command(samsung, command: commands->get_usb_charge,
782	in: &data, out: &data);
783
784	if (retval)
785	return retval;
786
787	if (data.data[0] != 0 && data.data[0] != 1)
788	return -ENODEV;
789
790	return data.data[0];
791	}
792
793	static int write_usb_charge(struct samsung_laptop *samsung,
794	int enabled)
795	{
796	const struct sabi_commands *commands = &samsung->config->commands;
797	struct sabi_data data;
798
799	memset(&data, 0, sizeof(data));
800	data.data[0] = 0x80 | enabled;
801	return sabi_command(samsung, command: commands->set_usb_charge,
802	in: &data, NULL);
803	}
804
805	static ssize_t get_usb_charge(struct device *dev,
806	struct device_attribute *attr,
807	char *buf)
808	{
809	struct samsung_laptop *samsung = dev_get_drvdata(dev);
810	int ret;
811
812	ret = read_usb_charge(samsung);
813	if (ret < 0)
814	return ret;
815
816	return sprintf(buf, fmt: "%d\n", ret);
817	}
818
819	static ssize_t set_usb_charge(struct device *dev,
820	struct device_attribute *attr,
821	const char *buf, size_t count)
822	{
823	struct samsung_laptop *samsung = dev_get_drvdata(dev);
824	int ret, value;
825
826	if (!count || kstrtoint(s: buf, base: 0, res: &value) != 0)
827	return -EINVAL;
828
829	ret = write_usb_charge(samsung, enabled: !!value);
830	if (ret < 0)
831	return ret;
832
833	return count;
834	}
835
836	static DEVICE_ATTR(usb_charge, 0644,
837	get_usb_charge, set_usb_charge);
838
839	static int read_lid_handling(struct samsung_laptop *samsung)
840	{
841	const struct sabi_commands *commands = &samsung->config->commands;
842	struct sabi_data data;
843	int retval;
844
845	if (commands->get_lid_handling == 0xFFFF)
846	return -ENODEV;
847
848	memset(&data, 0, sizeof(data));
849	retval = sabi_command(samsung, command: commands->get_lid_handling,
850	in: &data, out: &data);
851
852	if (retval)
853	return retval;
854
855	return data.data[0] & 0x1;
856	}
857
858	static int write_lid_handling(struct samsung_laptop *samsung,
859	int enabled)
860	{
861	const struct sabi_commands *commands = &samsung->config->commands;
862	struct sabi_data data;
863
864	memset(&data, 0, sizeof(data));
865	data.data[0] = 0x80 | enabled;
866	return sabi_command(samsung, command: commands->set_lid_handling,
867	in: &data, NULL);
868	}
869
870	static ssize_t get_lid_handling(struct device *dev,
871	struct device_attribute *attr,
872	char *buf)
873	{
874	struct samsung_laptop *samsung = dev_get_drvdata(dev);
875	int ret;
876
877	ret = read_lid_handling(samsung);
878	if (ret < 0)
879	return ret;
880
881	return sprintf(buf, fmt: "%d\n", ret);
882	}
883
884	static ssize_t set_lid_handling(struct device *dev,
885	struct device_attribute *attr,
886	const char *buf, size_t count)
887	{
888	struct samsung_laptop *samsung = dev_get_drvdata(dev);
889	int ret, value;
890
891	if (!count || kstrtoint(s: buf, base: 0, res: &value) != 0)
892	return -EINVAL;
893
894	ret = write_lid_handling(samsung, enabled: !!value);
895	if (ret < 0)
896	return ret;
897
898	return count;
899	}
900
901	static DEVICE_ATTR(lid_handling, 0644,
902	get_lid_handling, set_lid_handling);
903
904	static struct attribute *platform_attributes[] = {
905	&dev_attr_performance_level.attr,
906	&dev_attr_battery_life_extender.attr,
907	&dev_attr_usb_charge.attr,
908	&dev_attr_lid_handling.attr,
909	NULL
910	};
911
912	static int find_signature(void __iomem *memcheck, const char *testStr)
913	{
914	int i = 0;
915	int loca;
916
917	for (loca = 0; loca < 0xffff; loca++) {
918	char temp = readb(addr: memcheck + loca);
919
920	if (temp == testStr[i]) {
921	if (i == strlen(testStr)-1)
922	break;
923	++i;
924	} else {
925	i = 0;
926	}
927	}
928	return loca;
929	}
930
931	static void samsung_rfkill_exit(struct samsung_laptop *samsung)
932	{
933	if (samsung->wlan.rfkill) {
934	rfkill_unregister(rfkill: samsung->wlan.rfkill);
935	rfkill_destroy(rfkill: samsung->wlan.rfkill);
936	samsung->wlan.rfkill = NULL;
937	}
938	if (samsung->bluetooth.rfkill) {
939	rfkill_unregister(rfkill: samsung->bluetooth.rfkill);
940	rfkill_destroy(rfkill: samsung->bluetooth.rfkill);
941	samsung->bluetooth.rfkill = NULL;
942	}
943	}
944
945	static int samsung_new_rfkill(struct samsung_laptop *samsung,
946	struct samsung_rfkill *arfkill,
947	const char *name, enum rfkill_type type,
948	const struct rfkill_ops *ops,
949	int blocked)
950	{
951	struct rfkill **rfkill = &arfkill->rfkill;
952	int ret;
953
954	arfkill->type = type;
955	arfkill->samsung = samsung;
956
957	*rfkill = rfkill_alloc(name, parent: &samsung->platform_device->dev,
958	type, ops, ops_data: arfkill);
959
960	if (!*rfkill)
961	return -EINVAL;
962
963	if (blocked != -1)
964	rfkill_init_sw_state(rfkill: *rfkill, blocked);
965
966	ret = rfkill_register(rfkill: *rfkill);
967	if (ret) {
968	rfkill_destroy(rfkill: *rfkill);
969	*rfkill = NULL;
970	return ret;
971	}
972	return 0;
973	}
974
975	static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
976	{
977	return samsung_new_rfkill(samsung, arfkill: &samsung->wlan, name: "samsung-wlan",
978	type: RFKILL_TYPE_WLAN, ops: &seclinux_rfkill_ops, blocked: -1);
979	}
980
981	static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
982	{
983	struct sabi_data data;
984	int ret;
985
986	ret = swsmi_wireless_status(samsung, data: &data);
987	if (ret) {
988	/* Some swsmi laptops use the old seclinux way to control
989	* wireless devices */
990	if (ret == -EINVAL)
991	ret = samsung_rfkill_init_seclinux(samsung);
992	return ret;
993	}
994
995	/* 0x02 seems to mean that the device is no present/available */
996
997	if (data.data[WL_STATUS_WLAN] != 0x02)
998	ret = samsung_new_rfkill(samsung, arfkill: &samsung->wlan,
999	name: "samsung-wlan",
1000	type: RFKILL_TYPE_WLAN,
1001	ops: &swsmi_rfkill_ops,
1002	blocked: !data.data[WL_STATUS_WLAN]);
1003	if (ret)
1004	goto exit;
1005
1006	if (data.data[WL_STATUS_BT] != 0x02)
1007	ret = samsung_new_rfkill(samsung, arfkill: &samsung->bluetooth,
1008	name: "samsung-bluetooth",
1009	type: RFKILL_TYPE_BLUETOOTH,
1010	ops: &swsmi_rfkill_ops,
1011	blocked: !data.data[WL_STATUS_BT]);
1012	if (ret)
1013	goto exit;
1014
1015	exit:
1016	if (ret)
1017	samsung_rfkill_exit(samsung);
1018
1019	return ret;
1020	}
1021
1022	static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
1023	{
1024	if (samsung->config->sabi_version == 2)
1025	return samsung_rfkill_init_seclinux(samsung);
1026	if (samsung->config->sabi_version == 3)
1027	return samsung_rfkill_init_swsmi(samsung);
1028	return 0;
1029	}
1030
1031	static void samsung_lid_handling_exit(struct samsung_laptop *samsung)
1032	{
1033	if (samsung->quirks->lid_handling)
1034	write_lid_handling(samsung, enabled: 0);
1035	}
1036
1037	static int __init samsung_lid_handling_init(struct samsung_laptop *samsung)
1038	{
1039	int retval = 0;
1040
1041	if (samsung->quirks->lid_handling)
1042	retval = write_lid_handling(samsung, enabled: 1);
1043
1044	return retval;
1045	}
1046
1047	static int kbd_backlight_enable(struct samsung_laptop *samsung)
1048	{
1049	const struct sabi_commands *commands = &samsung->config->commands;
1050	struct sabi_data data;
1051	int retval;
1052
1053	if (commands->kbd_backlight == 0xFFFF)
1054	return -ENODEV;
1055
1056	memset(&data, 0, sizeof(data));
1057	data.d0 = 0xaabb;
1058	retval = sabi_command(samsung, command: commands->kbd_backlight,
1059	in: &data, out: &data);
1060
1061	if (retval)
1062	return retval;
1063
1064	if (data.d0 != 0xccdd)
1065	return -ENODEV;
1066	return 0;
1067	}
1068
1069	static int kbd_backlight_read(struct samsung_laptop *samsung)
1070	{
1071	const struct sabi_commands *commands = &samsung->config->commands;
1072	struct sabi_data data;
1073	int retval;
1074
1075	memset(&data, 0, sizeof(data));
1076	data.data[0] = 0x81;
1077	retval = sabi_command(samsung, command: commands->kbd_backlight,
1078	in: &data, out: &data);
1079
1080	if (retval)
1081	return retval;
1082
1083	return data.data[0];
1084	}
1085
1086	static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1087	{
1088	const struct sabi_commands *commands = &samsung->config->commands;
1089	struct sabi_data data;
1090
1091	memset(&data, 0, sizeof(data));
1092	data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1093	return sabi_command(samsung, command: commands->kbd_backlight,
1094	in: &data, NULL);
1095	}
1096
1097	static void kbd_led_update(struct work_struct *work)
1098	{
1099	struct samsung_laptop *samsung;
1100
1101	samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1102	kbd_backlight_write(samsung, brightness: samsung->kbd_led_wk);
1103	}
1104
1105	static void kbd_led_set(struct led_classdev *led_cdev,
1106	enum led_brightness value)
1107	{
1108	struct samsung_laptop *samsung;
1109
1110	samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1111
1112	if (value > samsung->kbd_led.max_brightness)
1113	value = samsung->kbd_led.max_brightness;
1114
1115	samsung->kbd_led_wk = value;
1116	queue_work(wq: samsung->led_workqueue, work: &samsung->kbd_led_work);
1117	}
1118
1119	static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1120	{
1121	struct samsung_laptop *samsung;
1122
1123	samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1124	return kbd_backlight_read(samsung);
1125	}
1126
1127	static void samsung_leds_exit(struct samsung_laptop *samsung)
1128	{
1129	led_classdev_unregister(led_cdev: &samsung->kbd_led);
1130	if (samsung->led_workqueue)
1131	destroy_workqueue(wq: samsung->led_workqueue);
1132	}
1133
1134	static int __init samsung_leds_init(struct samsung_laptop *samsung)
1135	{
1136	int ret = 0;
1137
1138	samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1139	if (!samsung->led_workqueue)
1140	return -ENOMEM;
1141
1142	if (kbd_backlight_enable(samsung) >= 0) {
1143	INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1144
1145	samsung->kbd_led.name = "samsung::kbd_backlight";
1146	samsung->kbd_led.brightness_set = kbd_led_set;
1147	samsung->kbd_led.brightness_get = kbd_led_get;
1148	samsung->kbd_led.max_brightness = 8;
1149	if (samsung->quirks->four_kbd_backlight_levels)
1150	samsung->kbd_led.max_brightness = 4;
1151
1152	ret = led_classdev_register(parent: &samsung->platform_device->dev,
1153	led_cdev: &samsung->kbd_led);
1154	}
1155
1156	if (ret)
1157	samsung_leds_exit(samsung);
1158
1159	return ret;
1160	}
1161
1162	static void samsung_backlight_exit(struct samsung_laptop *samsung)
1163	{
1164	if (samsung->backlight_device) {
1165	backlight_device_unregister(bd: samsung->backlight_device);
1166	samsung->backlight_device = NULL;
1167	}
1168	}
1169
1170	static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1171	{
1172	struct backlight_device *bd;
1173	struct backlight_properties props;
1174
1175	if (!samsung->handle_backlight)
1176	return 0;
1177
1178	memset(&props, 0, sizeof(struct backlight_properties));
1179	props.type = BACKLIGHT_PLATFORM;
1180	props.max_brightness = samsung->config->max_brightness -
1181	samsung->config->min_brightness;
1182
1183	bd = backlight_device_register(name: "samsung",
1184	dev: &samsung->platform_device->dev,
1185	devdata: samsung, ops: &backlight_ops,
1186	props: &props);
1187	if (IS_ERR(ptr: bd))
1188	return PTR_ERR(ptr: bd);
1189
1190	samsung->backlight_device = bd;
1191	samsung->backlight_device->props.brightness = read_brightness(samsung);
1192	samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1193	backlight_update_status(bd: samsung->backlight_device);
1194
1195	return 0;
1196	}
1197
1198	static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1199	struct attribute *attr, int idx)
1200	{
1201	struct device *dev = kobj_to_dev(kobj);
1202	struct samsung_laptop *samsung = dev_get_drvdata(dev);
1203	bool ok = true;
1204
1205	if (attr == &dev_attr_performance_level.attr)
1206	ok = !!samsung->config->performance_levels[0].name;
1207	if (attr == &dev_attr_battery_life_extender.attr)
1208	ok = !!(read_battery_life_extender(samsung) >= 0);
1209	if (attr == &dev_attr_usb_charge.attr)
1210	ok = !!(read_usb_charge(samsung) >= 0);
1211	if (attr == &dev_attr_lid_handling.attr)
1212	ok = !!(read_lid_handling(samsung) >= 0);
1213
1214	return ok ? attr->mode : 0;
1215	}
1216
1217	static const struct attribute_group platform_attribute_group = {
1218	.is_visible = samsung_sysfs_is_visible,
1219	.attrs = platform_attributes
1220	};
1221
1222	static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1223	{
1224	struct platform_device *device = samsung->platform_device;
1225
1226	sysfs_remove_group(kobj: &device->dev.kobj, grp: &platform_attribute_group);
1227	}
1228
1229	static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1230	{
1231	struct platform_device *device = samsung->platform_device;
1232
1233	return sysfs_create_group(kobj: &device->dev.kobj, grp: &platform_attribute_group);
1234
1235	}
1236
1237	static int samsung_laptop_call_show(struct seq_file *m, void *data)
1238	{
1239	struct samsung_laptop *samsung = m->private;
1240	struct sabi_data *sdata = &samsung->debug.data;
1241	int ret;
1242
1243	seq_printf(m, fmt: "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1244	samsung->debug.command,
1245	sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1246
1247	ret = sabi_command(samsung, command: samsung->debug.command, in: sdata, out: sdata);
1248
1249	if (ret) {
1250	seq_printf(m, fmt: "SABI command 0x%04x failed\n",
1251	samsung->debug.command);
1252	return ret;
1253	}
1254
1255	seq_printf(m, fmt: "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1256	sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1257	return 0;
1258	}
1259	DEFINE_SHOW_ATTRIBUTE(samsung_laptop_call);
1260
1261	static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1262	{
1263	debugfs_remove_recursive(dentry: samsung->debug.root);
1264	}
1265
1266	static void samsung_debugfs_init(struct samsung_laptop *samsung)
1267	{
1268	struct dentry *root;
1269
1270	root = debugfs_create_dir(name: "samsung-laptop", NULL);
1271	samsung->debug.root = root;
1272
1273	samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1274	samsung->debug.f0000_wrapper.size = 0xffff;
1275
1276	samsung->debug.data_wrapper.data = &samsung->debug.data;
1277	samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1278
1279	samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1280	samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1281
1282	debugfs_create_u16(name: "command", mode: 0644, parent: root, value: &samsung->debug.command);
1283	debugfs_create_u32(name: "d0", mode: 0644, parent: root, value: &samsung->debug.data.d0);
1284	debugfs_create_u32(name: "d1", mode: 0644, parent: root, value: &samsung->debug.data.d1);
1285	debugfs_create_u16(name: "d2", mode: 0644, parent: root, value: &samsung->debug.data.d2);
1286	debugfs_create_u8(name: "d3", mode: 0644, parent: root, value: &samsung->debug.data.d3);
1287	debugfs_create_blob(name: "data", mode: 0444, parent: root, blob: &samsung->debug.data_wrapper);
1288	debugfs_create_blob(name: "f0000_segment", mode: 0400, parent: root,
1289	blob: &samsung->debug.f0000_wrapper);
1290	debugfs_create_file(name: "call", mode: 0444, parent: root, data: samsung,
1291	fops: &samsung_laptop_call_fops);
1292	debugfs_create_blob(name: "sdiag", mode: 0444, parent: root, blob: &samsung->debug.sdiag_wrapper);
1293	}
1294
1295	static void samsung_sabi_exit(struct samsung_laptop *samsung)
1296	{
1297	const struct sabi_config *config = samsung->config;
1298
1299	/* Turn off "Linux" mode in the BIOS */
1300	if (config && config->commands.set_linux != 0xff)
1301	sabi_set_commandb(samsung, command: config->commands.set_linux, data: 0x80);
1302
1303	if (samsung->sabi_iface) {
1304	iounmap(addr: samsung->sabi_iface);
1305	samsung->sabi_iface = NULL;
1306	}
1307	if (samsung->f0000_segment) {
1308	iounmap(addr: samsung->f0000_segment);
1309	samsung->f0000_segment = NULL;
1310	}
1311
1312	samsung->config = NULL;
1313	}
1314
1315	static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1316	unsigned int ifaceP)
1317	{
1318	const struct sabi_config *config = samsung->config;
1319
1320	printk(KERN_DEBUG "This computer supports SABI==%x\n",
1321	loca + 0xf0000 - 6);
1322
1323	printk(KERN_DEBUG "SABI header:\n");
1324	printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1325	readw(samsung->sabi + config->header_offsets.port));
1326	printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1327	readb(samsung->sabi + config->header_offsets.iface_func));
1328	printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1329	readb(samsung->sabi + config->header_offsets.en_mem));
1330	printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1331	readb(samsung->sabi + config->header_offsets.re_mem));
1332	printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1333	readw(samsung->sabi + config->header_offsets.data_offset));
1334	printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1335	readw(samsung->sabi + config->header_offsets.data_segment));
1336
1337	printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1338	}
1339
1340	static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1341	{
1342	int loca = find_signature(memcheck: samsung->f0000_segment, testStr: "SDiaG@");
1343	int i;
1344
1345	if (loca == 0xffff)
1346	return ;
1347
1348	/* Example:
1349	* Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1350	*
1351	* Product name: 90X3A
1352	* BIOS Version: 07HL
1353	*/
1354	loca += 1;
1355	for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1356	char temp = readb(addr: samsung->f0000_segment + loca);
1357
1358	if (isalnum(temp) || temp == '/' || temp == '-')
1359	samsung->sdiag[i++] = temp;
1360	else
1361	break ;
1362	}
1363
1364	if (debug && samsung->sdiag[0])
1365	pr_info("sdiag: %s", samsung->sdiag);
1366	}
1367
1368	static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1369	{
1370	const struct sabi_config *config = NULL;
1371	const struct sabi_commands *commands;
1372	unsigned int ifaceP;
1373	int loca = 0xffff;
1374	int ret = 0;
1375	int i;
1376
1377	samsung->f0000_segment = ioremap(offset: 0xf0000, size: 0xffff);
1378	if (!samsung->f0000_segment) {
1379	if (debug || force)
1380	pr_err("Can't map the segment at 0xf0000\n");
1381	ret = -EINVAL;
1382	goto exit;
1383	}
1384
1385	samsung_sabi_diag(samsung);
1386
1387	/* Try to find one of the signatures in memory to find the header */
1388	for (i = 0; sabi_configs[i].test_string != NULL; ++i) {
1389	samsung->config = &sabi_configs[i];
1390	loca = find_signature(memcheck: samsung->f0000_segment,
1391	testStr: samsung->config->test_string);
1392	if (loca != 0xffff)
1393	break;
1394	}
1395
1396	if (loca == 0xffff) {
1397	if (debug || force)
1398	pr_err("This computer does not support SABI\n");
1399	ret = -ENODEV;
1400	goto exit;
1401	}
1402
1403	config = samsung->config;
1404	commands = &config->commands;
1405
1406	/* point to the SMI port Number */
1407	loca += 1;
1408	samsung->sabi = (samsung->f0000_segment + loca);
1409
1410	/* Get a pointer to the SABI Interface */
1411	ifaceP = (readw(addr: samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1412	ifaceP += readw(addr: samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1413
1414	if (debug)
1415	samsung_sabi_infos(samsung, loca, ifaceP);
1416
1417	samsung->sabi_iface = ioremap(offset: ifaceP, size: 16);
1418	if (!samsung->sabi_iface) {
1419	pr_err("Can't remap %x\n", ifaceP);
1420	ret = -EINVAL;
1421	goto exit;
1422	}
1423
1424	/* Turn on "Linux" mode in the BIOS */
1425	if (commands->set_linux != 0xff) {
1426	int retval = sabi_set_commandb(samsung,
1427	command: commands->set_linux, data: 0x81);
1428	if (retval) {
1429	pr_warn("Linux mode was not set!\n");
1430	ret = -ENODEV;
1431	goto exit;
1432	}
1433	}
1434
1435	/* Check for stepping quirk */
1436	if (samsung->handle_backlight)
1437	check_for_stepping_quirk(samsung);
1438
1439	pr_info("detected SABI interface: %s\n",
1440	samsung->config->test_string);
1441
1442	exit:
1443	if (ret)
1444	samsung_sabi_exit(samsung);
1445
1446	return ret;
1447	}
1448
1449	static void samsung_platform_exit(struct samsung_laptop *samsung)
1450	{
1451	if (samsung->platform_device) {
1452	platform_device_unregister(samsung->platform_device);
1453	samsung->platform_device = NULL;
1454	}
1455	}
1456
1457	static int samsung_pm_notification(struct notifier_block *nb,
1458	unsigned long val, void *ptr)
1459	{
1460	struct samsung_laptop *samsung;
1461
1462	samsung = container_of(nb, struct samsung_laptop, pm_nb);
1463	if (val == PM_POST_HIBERNATION &&
1464	samsung->quirks->enable_kbd_backlight)
1465	kbd_backlight_enable(samsung);
1466
1467	if (val == PM_POST_HIBERNATION && samsung->quirks->lid_handling)
1468	write_lid_handling(samsung, enabled: 1);
1469
1470	return 0;
1471	}
1472
1473	static int __init samsung_platform_init(struct samsung_laptop *samsung)
1474	{
1475	struct platform_device *pdev;
1476
1477	pdev = platform_device_register_simple(name: "samsung", PLATFORM_DEVID_NONE, NULL, num: 0);
1478	if (IS_ERR(ptr: pdev))
1479	return PTR_ERR(ptr: pdev);
1480
1481	samsung->platform_device = pdev;
1482	platform_set_drvdata(pdev: samsung->platform_device, data: samsung);
1483	return 0;
1484	}
1485
1486	static struct samsung_quirks *quirks;
1487
1488	static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1489	{
1490	quirks = d->driver_data;
1491	return 0;
1492	}
1493
1494	static const struct dmi_system_id samsung_dmi_table[] __initconst = {
1495	{
1496	.matches = {
1497	DMI_MATCH(DMI_SYS_VENDOR,
1498	"SAMSUNG ELECTRONICS CO., LTD."),
1499	DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1500	},
1501	},
1502	{
1503	.matches = {
1504	DMI_MATCH(DMI_SYS_VENDOR,
1505	"SAMSUNG ELECTRONICS CO., LTD."),
1506	DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1507	},
1508	},
1509	{
1510	.matches = {
1511	DMI_MATCH(DMI_SYS_VENDOR,
1512	"SAMSUNG ELECTRONICS CO., LTD."),
1513	DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1514	},
1515	},
1516	{
1517	.matches = {
1518	DMI_MATCH(DMI_SYS_VENDOR,
1519	"SAMSUNG ELECTRONICS CO., LTD."),
1520	DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1521	},
1522	},
1523	/* DMI ids for laptops with bad Chassis Type */
1524	{
1525	.ident = "R40/R41",
1526	.matches = {
1527	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1528	DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1529	DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1530	},
1531	},
1532	/* Specific DMI ids for laptop with quirks */
1533	{
1534	.callback = samsung_dmi_matched,
1535	.ident = "730U3E/740U3E",
1536	.matches = {
1537	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1538	DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1539	},
1540	.driver_data = &samsung_np740u3e,
1541	},
1542	{
1543	.callback = samsung_dmi_matched,
1544	.ident = "300V3Z/300V4Z/300V5Z",
1545	.matches = {
1546	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1547	DMI_MATCH(DMI_PRODUCT_NAME, "300V3Z/300V4Z/300V5Z"),
1548	},
1549	.driver_data = &samsung_lid_handling,
1550	},
1551	{ },
1552	};
1553	MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1554
1555	static struct platform_device *samsung_platform_device;
1556
1557	static int __init samsung_init(void)
1558	{
1559	struct samsung_laptop *samsung;
1560	int ret;
1561
1562	if (efi_enabled(EFI_BOOT))
1563	return -ENODEV;
1564
1565	quirks = &samsung_unknown;
1566	if (!force && !dmi_check_system(list: samsung_dmi_table))
1567	return -ENODEV;
1568
1569	samsung = kzalloc(size: sizeof(*samsung), GFP_KERNEL);
1570	if (!samsung)
1571	return -ENOMEM;
1572
1573	mutex_init(&samsung->sabi_mutex);
1574	samsung->handle_backlight = true;
1575	samsung->quirks = quirks;
1576
1577	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
1578	samsung->handle_backlight = false;
1579
1580	ret = samsung_platform_init(samsung);
1581	if (ret)
1582	goto error_platform;
1583
1584	ret = samsung_sabi_init(samsung);
1585	if (ret)
1586	goto error_sabi;
1587
1588	ret = samsung_sysfs_init(samsung);
1589	if (ret)
1590	goto error_sysfs;
1591
1592	ret = samsung_backlight_init(samsung);
1593	if (ret)
1594	goto error_backlight;
1595
1596	ret = samsung_rfkill_init(samsung);
1597	if (ret)
1598	goto error_rfkill;
1599
1600	ret = samsung_leds_init(samsung);
1601	if (ret)
1602	goto error_leds;
1603
1604	ret = samsung_lid_handling_init(samsung);
1605	if (ret)
1606	goto error_lid_handling;
1607
1608	samsung_debugfs_init(samsung);
1609
1610	samsung->pm_nb.notifier_call = samsung_pm_notification;
1611	register_pm_notifier(nb: &samsung->pm_nb);
1612
1613	samsung_platform_device = samsung->platform_device;
1614	return ret;
1615
1616	error_lid_handling:
1617	samsung_leds_exit(samsung);
1618	error_leds:
1619	samsung_rfkill_exit(samsung);
1620	error_rfkill:
1621	samsung_backlight_exit(samsung);
1622	error_backlight:
1623	samsung_sysfs_exit(samsung);
1624	error_sysfs:
1625	samsung_sabi_exit(samsung);
1626	error_sabi:
1627	samsung_platform_exit(samsung);
1628	error_platform:
1629	kfree(objp: samsung);
1630	return ret;
1631	}
1632
1633	static void __exit samsung_exit(void)
1634	{
1635	struct samsung_laptop *samsung;
1636
1637	samsung = platform_get_drvdata(pdev: samsung_platform_device);
1638	unregister_pm_notifier(nb: &samsung->pm_nb);
1639
1640	samsung_debugfs_exit(samsung);
1641	samsung_lid_handling_exit(samsung);
1642	samsung_leds_exit(samsung);
1643	samsung_rfkill_exit(samsung);
1644	samsung_backlight_exit(samsung);
1645	samsung_sysfs_exit(samsung);
1646	samsung_sabi_exit(samsung);
1647	samsung_platform_exit(samsung);
1648
1649	kfree(objp: samsung);
1650	samsung_platform_device = NULL;
1651	}
1652
1653	module_init(samsung_init);
1654	module_exit(samsung_exit);
1655
1656	MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1657	MODULE_DESCRIPTION("Samsung Backlight driver");
1658	MODULE_LICENSE("GPL");
1659