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 
sabi_command(struct samsung_laptop * samsung,u16 command,struct sabi_data * in,struct sabi_data * out)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(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(samsung->sabi + config->header_offsets.en_mem), port);
406 
407 	/* write out the command */
408 	writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
409 	writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
410 	writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
411 	if (in) {
412 		writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
413 		writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
414 		writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
415 		writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
416 	}
417 	outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
418 
419 	/* write protect memory to make it safe */
420 	outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
421 
422 	/* see if the command actually succeeded */
423 	complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
424 	iface_data = readb(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(samsung->sabi_iface + SABI_IFACE_DATA);
442 		out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
443 		out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
444 		out->d3 = readb(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(&samsung->sabi_mutex);
454 	return ret;
455 }
456 
457 /* simple wrappers usable with most commands */
sabi_set_commandb(struct samsung_laptop * samsung,u16 command,u8 data)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, NULL);
465 }
466 
read_brightness(struct samsung_laptop * samsung)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, commands->get_brightness,
476 			      NULL, &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 
set_brightness(struct samsung_laptop * samsung,u8 user_brightness)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, commands->set_brightness, 0);
504 	}
505 
506 	sabi_set_commandb(samsung, commands->set_brightness, user_level);
507 }
508 
get_brightness(struct backlight_device * bd)509 static int get_brightness(struct backlight_device *bd)
510 {
511 	struct samsung_laptop *samsung = bl_get_data(bd);
512 
513 	return read_brightness(samsung);
514 }
515 
check_for_stepping_quirk(struct samsung_laptop * samsung)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, 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, 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, orig_level);
548 }
549 
update_status(struct backlight_device * bd)550 static int update_status(struct backlight_device *bd)
551 {
552 	struct samsung_laptop *samsung = bl_get_data(bd);
553 	const struct sabi_commands *commands = &samsung->config->commands;
554 
555 	set_brightness(samsung, bd->props.brightness);
556 
557 	if (bd->props.power == FB_BLANK_UNBLANK)
558 		sabi_set_commandb(samsung, commands->set_backlight, 1);
559 	else
560 		sabi_set_commandb(samsung, commands->set_backlight, 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 
seclinux_rfkill_set(void * data,bool blocked)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, commands->set_wireless_button,
577 				 !blocked);
578 }
579 
580 static const struct rfkill_ops seclinux_rfkill_ops = {
581 	.set_block = seclinux_rfkill_set,
582 };
583 
swsmi_wireless_status(struct samsung_laptop * samsung,struct sabi_data * data)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, commands->get_wireless_status,
590 			    NULL, data);
591 }
592 
swsmi_rfkill_set(void * priv,bool blocked)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);
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, commands->set_wireless_status,
616 			    &data, &data);
617 }
618 
swsmi_rfkill_query(struct rfkill * rfkill,void * priv)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);
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, !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 
get_performance_level(struct device * dev,struct device_attribute * attr,char * buf)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, commands->get_performance_level,
657 			      NULL, &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, "%s\n", config->performance_levels[i].name);
665 	}
666 	return sprintf(buf, "%s\n", "unknown");
667 }
668 
set_performance_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(level->name, buf, strlen(level->name))) {
685 			sabi_set_commandb(samsung,
686 					  commands->set_performance_level,
687 					  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 
read_battery_life_extender(struct samsung_laptop * samsung)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, commands->get_battery_life_extender,
713 			      &data, &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 
write_battery_life_extender(struct samsung_laptop * samsung,int enabled)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, commands->set_battery_life_extender,
733 			    &data, NULL);
734 }
735 
get_battery_life_extender(struct device * dev,struct device_attribute * attr,char * buf)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, "%d\n", ret);
748 }
749 
set_battery_life_extender(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(buf, 0, &value) != 0)
758 		return -EINVAL;
759 
760 	ret = write_battery_life_extender(samsung, !!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 
read_usb_charge(struct samsung_laptop * samsung)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, commands->get_usb_charge,
782 			      &data, &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 
write_usb_charge(struct samsung_laptop * samsung,int enabled)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, commands->set_usb_charge,
802 			    &data, NULL);
803 }
804 
get_usb_charge(struct device * dev,struct device_attribute * attr,char * buf)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, "%d\n", ret);
817 }
818 
set_usb_charge(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(buf, 0, &value) != 0)
827 		return -EINVAL;
828 
829 	ret = write_usb_charge(samsung, !!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 
read_lid_handling(struct samsung_laptop * samsung)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, commands->get_lid_handling,
850 			      &data, &data);
851 
852 	if (retval)
853 		return retval;
854 
855 	return data.data[0] & 0x1;
856 }
857 
write_lid_handling(struct samsung_laptop * samsung,int enabled)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, commands->set_lid_handling,
867 			    &data, NULL);
868 }
869 
get_lid_handling(struct device * dev,struct device_attribute * attr,char * buf)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, "%d\n", ret);
882 }
883 
set_lid_handling(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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(buf, 0, &value) != 0)
892 		return -EINVAL;
893 
894 	ret = write_lid_handling(samsung, !!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 
find_signature(void __iomem * memcheck,const char * testStr)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(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 
samsung_rfkill_exit(struct samsung_laptop * samsung)931 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
932 {
933 	if (samsung->wlan.rfkill) {
934 		rfkill_unregister(samsung->wlan.rfkill);
935 		rfkill_destroy(samsung->wlan.rfkill);
936 		samsung->wlan.rfkill = NULL;
937 	}
938 	if (samsung->bluetooth.rfkill) {
939 		rfkill_unregister(samsung->bluetooth.rfkill);
940 		rfkill_destroy(samsung->bluetooth.rfkill);
941 		samsung->bluetooth.rfkill = NULL;
942 	}
943 }
944 
samsung_new_rfkill(struct samsung_laptop * samsung,struct samsung_rfkill * arfkill,const char * name,enum rfkill_type type,const struct rfkill_ops * ops,int blocked)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, &samsung->platform_device->dev,
958 			       type, ops, arfkill);
959 
960 	if (!*rfkill)
961 		return -EINVAL;
962 
963 	if (blocked != -1)
964 		rfkill_init_sw_state(*rfkill, blocked);
965 
966 	ret = rfkill_register(*rfkill);
967 	if (ret) {
968 		rfkill_destroy(*rfkill);
969 		*rfkill = NULL;
970 		return ret;
971 	}
972 	return 0;
973 }
974 
samsung_rfkill_init_seclinux(struct samsung_laptop * samsung)975 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
976 {
977 	return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
978 				  RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
979 }
980 
samsung_rfkill_init_swsmi(struct samsung_laptop * samsung)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);
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, &samsung->wlan,
999 					 "samsung-wlan",
1000 					 RFKILL_TYPE_WLAN,
1001 					 &swsmi_rfkill_ops,
1002 					 !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, &samsung->bluetooth,
1008 					 "samsung-bluetooth",
1009 					 RFKILL_TYPE_BLUETOOTH,
1010 					 &swsmi_rfkill_ops,
1011 					 !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 
samsung_rfkill_init(struct samsung_laptop * samsung)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 
samsung_lid_handling_exit(struct samsung_laptop * samsung)1031 static void samsung_lid_handling_exit(struct samsung_laptop *samsung)
1032 {
1033 	if (samsung->quirks->lid_handling)
1034 		write_lid_handling(samsung, 0);
1035 }
1036 
samsung_lid_handling_init(struct samsung_laptop * samsung)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, 1);
1043 
1044 	return retval;
1045 }
1046 
kbd_backlight_enable(struct samsung_laptop * samsung)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, commands->kbd_backlight,
1059 			      &data, &data);
1060 
1061 	if (retval)
1062 		return retval;
1063 
1064 	if (data.d0 != 0xccdd)
1065 		return -ENODEV;
1066 	return 0;
1067 }
1068 
kbd_backlight_read(struct samsung_laptop * samsung)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, commands->kbd_backlight,
1078 			      &data, &data);
1079 
1080 	if (retval)
1081 		return retval;
1082 
1083 	return data.data[0];
1084 }
1085 
kbd_backlight_write(struct samsung_laptop * samsung,int brightness)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, commands->kbd_backlight,
1094 			    &data, NULL);
1095 }
1096 
kbd_led_update(struct work_struct * work)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, samsung->kbd_led_wk);
1103 }
1104 
kbd_led_set(struct led_classdev * led_cdev,enum led_brightness value)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(samsung->led_workqueue, &samsung->kbd_led_work);
1117 }
1118 
kbd_led_get(struct led_classdev * led_cdev)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 
samsung_leds_exit(struct samsung_laptop * samsung)1127 static void samsung_leds_exit(struct samsung_laptop *samsung)
1128 {
1129 	led_classdev_unregister(&samsung->kbd_led);
1130 	if (samsung->led_workqueue)
1131 		destroy_workqueue(samsung->led_workqueue);
1132 }
1133 
samsung_leds_init(struct samsung_laptop * samsung)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(&samsung->platform_device->dev,
1153 					   &samsung->kbd_led);
1154 	}
1155 
1156 	if (ret)
1157 		samsung_leds_exit(samsung);
1158 
1159 	return ret;
1160 }
1161 
samsung_backlight_exit(struct samsung_laptop * samsung)1162 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1163 {
1164 	if (samsung->backlight_device) {
1165 		backlight_device_unregister(samsung->backlight_device);
1166 		samsung->backlight_device = NULL;
1167 	}
1168 }
1169 
samsung_backlight_init(struct samsung_laptop * samsung)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("samsung",
1184 				       &samsung->platform_device->dev,
1185 				       samsung, &backlight_ops,
1186 				       &props);
1187 	if (IS_ERR(bd))
1188 		return PTR_ERR(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(samsung->backlight_device);
1194 
1195 	return 0;
1196 }
1197 
samsung_sysfs_is_visible(struct kobject * kobj,struct attribute * attr,int idx)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 
samsung_sysfs_exit(struct samsung_laptop * samsung)1222 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1223 {
1224 	struct platform_device *device = samsung->platform_device;
1225 
1226 	sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1227 }
1228 
samsung_sysfs_init(struct samsung_laptop * samsung)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(&device->dev.kobj, &platform_attribute_group);
1234 
1235 }
1236 
samsung_laptop_call_show(struct seq_file * m,void * data)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, "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, samsung->debug.command, sdata, sdata);
1248 
1249 	if (ret) {
1250 		seq_printf(m, "SABI command 0x%04x failed\n",
1251 			   samsung->debug.command);
1252 		return ret;
1253 	}
1254 
1255 	seq_printf(m, "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 
samsung_debugfs_exit(struct samsung_laptop * samsung)1261 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1262 {
1263 	debugfs_remove_recursive(samsung->debug.root);
1264 }
1265 
samsung_debugfs_init(struct samsung_laptop * samsung)1266 static void samsung_debugfs_init(struct samsung_laptop *samsung)
1267 {
1268 	struct dentry *root;
1269 
1270 	root = debugfs_create_dir("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("command", 0644, root, &samsung->debug.command);
1283 	debugfs_create_u32("d0", 0644, root, &samsung->debug.data.d0);
1284 	debugfs_create_u32("d1", 0644, root, &samsung->debug.data.d1);
1285 	debugfs_create_u16("d2", 0644, root, &samsung->debug.data.d2);
1286 	debugfs_create_u8("d3", 0644, root, &samsung->debug.data.d3);
1287 	debugfs_create_blob("data", 0444, root, &samsung->debug.data_wrapper);
1288 	debugfs_create_blob("f0000_segment", 0400, root,
1289 			    &samsung->debug.f0000_wrapper);
1290 	debugfs_create_file("call", 0444, root, samsung,
1291 			    &samsung_laptop_call_fops);
1292 	debugfs_create_blob("sdiag", 0444, root, &samsung->debug.sdiag_wrapper);
1293 }
1294 
samsung_sabi_exit(struct samsung_laptop * samsung)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, config->commands.set_linux, 0x80);
1302 
1303 	if (samsung->sabi_iface) {
1304 		iounmap(samsung->sabi_iface);
1305 		samsung->sabi_iface = NULL;
1306 	}
1307 	if (samsung->f0000_segment) {
1308 		iounmap(samsung->f0000_segment);
1309 		samsung->f0000_segment = NULL;
1310 	}
1311 
1312 	samsung->config = NULL;
1313 }
1314 
samsung_sabi_infos(struct samsung_laptop * samsung,int loca,unsigned int ifaceP)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 
samsung_sabi_diag(struct samsung_laptop * samsung)1340 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1341 {
1342 	int loca = find_signature(samsung->f0000_segment, "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(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 
samsung_sabi_init(struct samsung_laptop * samsung)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(0xf0000, 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(samsung->f0000_segment,
1391 				      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(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1412 	ifaceP += readw(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(ifaceP, 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 					       commands->set_linux, 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 
samsung_platform_exit(struct samsung_laptop * samsung)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 
samsung_pm_notification(struct notifier_block * nb,unsigned long val,void * ptr)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, 1);
1469 
1470 	return 0;
1471 }
1472 
samsung_platform_init(struct samsung_laptop * samsung)1473 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1474 {
1475 	struct platform_device *pdev;
1476 
1477 	pdev = platform_device_register_simple("samsung", PLATFORM_DEVID_NONE, NULL, 0);
1478 	if (IS_ERR(pdev))
1479 		return PTR_ERR(pdev);
1480 
1481 	samsung->platform_device = pdev;
1482 	platform_set_drvdata(samsung->platform_device, samsung);
1483 	return 0;
1484 }
1485 
1486 static struct samsung_quirks *quirks;
1487 
samsung_dmi_matched(const struct dmi_system_id * d)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 
samsung_init(void)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(samsung_dmi_table))
1567 		return -ENODEV;
1568 
1569 	samsung = kzalloc(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(&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(samsung);
1630 	return ret;
1631 }
1632 
samsung_exit(void)1633 static void __exit samsung_exit(void)
1634 {
1635 	struct samsung_laptop *samsung;
1636 
1637 	samsung = platform_get_drvdata(samsung_platform_device);
1638 	unregister_pm_notifier(&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(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