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