1 /*
2 * Samsung Laptop driver
3 *
4 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
5 * Copyright (C) 2009,2011 Novell Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 */
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/backlight.h>
20 #include <linux/fb.h>
21 #include <linux/dmi.h>
22 #include <linux/platform_device.h>
23 #include <linux/rfkill.h>
24
25 /*
26 * This driver is needed because a number of Samsung laptops do not hook
27 * their control settings through ACPI. So we have to poke around in the
28 * BIOS to do things like brightness values, and "special" key controls.
29 */
30
31 /*
32 * We have 0 - 8 as valid brightness levels. The specs say that level 0 should
33 * be reserved by the BIOS (which really doesn't make much sense), we tell
34 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
35 */
36 #define MAX_BRIGHT 0x07
37
38
39 #define SABI_IFACE_MAIN 0x00
40 #define SABI_IFACE_SUB 0x02
41 #define SABI_IFACE_COMPLETE 0x04
42 #define SABI_IFACE_DATA 0x05
43
44 /* Structure to get data back to the calling function */
45 struct sabi_retval {
46 u8 retval[20];
47 };
48
49 struct sabi_header_offsets {
50 u8 port;
51 u8 re_mem;
52 u8 iface_func;
53 u8 en_mem;
54 u8 data_offset;
55 u8 data_segment;
56 };
57
58 struct sabi_commands {
59 /*
60 * Brightness is 0 - 8, as described above.
61 * Value 0 is for the BIOS to use
62 */
63 u8 get_brightness;
64 u8 set_brightness;
65
66 /*
67 * first byte:
68 * 0x00 - wireless is off
69 * 0x01 - wireless is on
70 * second byte:
71 * 0x02 - 3G is off
72 * 0x03 - 3G is on
73 * TODO, verify 3G is correct, that doesn't seem right...
74 */
75 u8 get_wireless_button;
76 u8 set_wireless_button;
77
78 /* 0 is off, 1 is on */
79 u8 get_backlight;
80 u8 set_backlight;
81
82 /*
83 * 0x80 or 0x00 - no action
84 * 0x81 - recovery key pressed
85 */
86 u8 get_recovery_mode;
87 u8 set_recovery_mode;
88
89 /*
90 * on seclinux: 0 is low, 1 is high,
91 * on swsmi: 0 is normal, 1 is silent, 2 is turbo
92 */
93 u8 get_performance_level;
94 u8 set_performance_level;
95
96 /*
97 * Tell the BIOS that Linux is running on this machine.
98 * 81 is on, 80 is off
99 */
100 u8 set_linux;
101 };
102
103 struct sabi_performance_level {
104 const char *name;
105 u8 value;
106 };
107
108 struct sabi_config {
109 const char *test_string;
110 u16 main_function;
111 const struct sabi_header_offsets header_offsets;
112 const struct sabi_commands commands;
113 const struct sabi_performance_level performance_levels[4];
114 u8 min_brightness;
115 u8 max_brightness;
116 };
117
118 static const struct sabi_config sabi_configs[] = {
119 {
120 .test_string = "SECLINUX",
121
122 .main_function = 0x4c49,
123
124 .header_offsets = {
125 .port = 0x00,
126 .re_mem = 0x02,
127 .iface_func = 0x03,
128 .en_mem = 0x04,
129 .data_offset = 0x05,
130 .data_segment = 0x07,
131 },
132
133 .commands = {
134 .get_brightness = 0x00,
135 .set_brightness = 0x01,
136
137 .get_wireless_button = 0x02,
138 .set_wireless_button = 0x03,
139
140 .get_backlight = 0x04,
141 .set_backlight = 0x05,
142
143 .get_recovery_mode = 0x06,
144 .set_recovery_mode = 0x07,
145
146 .get_performance_level = 0x08,
147 .set_performance_level = 0x09,
148
149 .set_linux = 0x0a,
150 },
151
152 .performance_levels = {
153 {
154 .name = "silent",
155 .value = 0,
156 },
157 {
158 .name = "normal",
159 .value = 1,
160 },
161 { },
162 },
163 .min_brightness = 1,
164 .max_brightness = 8,
165 },
166 {
167 .test_string = "SwSmi@",
168
169 .main_function = 0x5843,
170
171 .header_offsets = {
172 .port = 0x00,
173 .re_mem = 0x04,
174 .iface_func = 0x02,
175 .en_mem = 0x03,
176 .data_offset = 0x05,
177 .data_segment = 0x07,
178 },
179
180 .commands = {
181 .get_brightness = 0x10,
182 .set_brightness = 0x11,
183
184 .get_wireless_button = 0x12,
185 .set_wireless_button = 0x13,
186
187 .get_backlight = 0x2d,
188 .set_backlight = 0x2e,
189
190 .get_recovery_mode = 0xff,
191 .set_recovery_mode = 0xff,
192
193 .get_performance_level = 0x31,
194 .set_performance_level = 0x32,
195
196 .set_linux = 0xff,
197 },
198
199 .performance_levels = {
200 {
201 .name = "normal",
202 .value = 0,
203 },
204 {
205 .name = "silent",
206 .value = 1,
207 },
208 {
209 .name = "overclock",
210 .value = 2,
211 },
212 { },
213 },
214 .min_brightness = 0,
215 .max_brightness = 8,
216 },
217 { },
218 };
219
220 static const struct sabi_config *sabi_config;
221
222 static void __iomem *sabi;
223 static void __iomem *sabi_iface;
224 static void __iomem *f0000_segment;
225 static struct backlight_device *backlight_device;
226 static struct mutex sabi_mutex;
227 static struct platform_device *sdev;
228 static struct rfkill *rfk;
229
230 static int force;
231 module_param(force, bool, 0);
232 MODULE_PARM_DESC(force,
233 "Disable the DMI check and forces the driver to be loaded");
234
235 static int debug;
236 module_param(debug, bool, S_IRUGO | S_IWUSR);
237 MODULE_PARM_DESC(debug, "Debug enabled or not");
238
sabi_get_command(u8 command,struct sabi_retval * sretval)239 static int sabi_get_command(u8 command, struct sabi_retval *sretval)
240 {
241 int retval = 0;
242 u16 port = readw(sabi + sabi_config->header_offsets.port);
243 u8 complete, iface_data;
244
245 mutex_lock(&sabi_mutex);
246
247 /* enable memory to be able to write to it */
248 outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
249
250 /* write out the command */
251 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
252 writew(command, sabi_iface + SABI_IFACE_SUB);
253 writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
254 outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
255
256 /* write protect memory to make it safe */
257 outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
258
259 /* see if the command actually succeeded */
260 complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
261 iface_data = readb(sabi_iface + SABI_IFACE_DATA);
262 if (complete != 0xaa || iface_data == 0xff) {
263 pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
264 command, complete, iface_data);
265 retval = -EINVAL;
266 goto exit;
267 }
268 /*
269 * Save off the data into a structure so the caller use it.
270 * Right now we only want the first 4 bytes,
271 * There are commands that need more, but not for the ones we
272 * currently care about.
273 */
274 sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
275 sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
276 sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
277 sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
278
279 exit:
280 mutex_unlock(&sabi_mutex);
281 return retval;
282
283 }
284
sabi_set_command(u8 command,u8 data)285 static int sabi_set_command(u8 command, u8 data)
286 {
287 int retval = 0;
288 u16 port = readw(sabi + sabi_config->header_offsets.port);
289 u8 complete, iface_data;
290
291 mutex_lock(&sabi_mutex);
292
293 /* enable memory to be able to write to it */
294 outb(readb(sabi + sabi_config->header_offsets.en_mem), port);
295
296 /* write out the command */
297 writew(sabi_config->main_function, sabi_iface + SABI_IFACE_MAIN);
298 writew(command, sabi_iface + SABI_IFACE_SUB);
299 writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
300 writeb(data, sabi_iface + SABI_IFACE_DATA);
301 outb(readb(sabi + sabi_config->header_offsets.iface_func), port);
302
303 /* write protect memory to make it safe */
304 outb(readb(sabi + sabi_config->header_offsets.re_mem), port);
305
306 /* see if the command actually succeeded */
307 complete = readb(sabi_iface + SABI_IFACE_COMPLETE);
308 iface_data = readb(sabi_iface + SABI_IFACE_DATA);
309 if (complete != 0xaa || iface_data == 0xff) {
310 pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n",
311 command, complete, iface_data);
312 retval = -EINVAL;
313 }
314
315 mutex_unlock(&sabi_mutex);
316 return retval;
317 }
318
test_backlight(void)319 static void test_backlight(void)
320 {
321 struct sabi_retval sretval;
322
323 sabi_get_command(sabi_config->commands.get_backlight, &sretval);
324 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
325
326 sabi_set_command(sabi_config->commands.set_backlight, 0);
327 printk(KERN_DEBUG "backlight should be off\n");
328
329 sabi_get_command(sabi_config->commands.get_backlight, &sretval);
330 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
331
332 msleep(1000);
333
334 sabi_set_command(sabi_config->commands.set_backlight, 1);
335 printk(KERN_DEBUG "backlight should be on\n");
336
337 sabi_get_command(sabi_config->commands.get_backlight, &sretval);
338 printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
339 }
340
test_wireless(void)341 static void test_wireless(void)
342 {
343 struct sabi_retval sretval;
344
345 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
346 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
347
348 sabi_set_command(sabi_config->commands.set_wireless_button, 0);
349 printk(KERN_DEBUG "wireless led should be off\n");
350
351 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
352 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
353
354 msleep(1000);
355
356 sabi_set_command(sabi_config->commands.set_wireless_button, 1);
357 printk(KERN_DEBUG "wireless led should be on\n");
358
359 sabi_get_command(sabi_config->commands.get_wireless_button, &sretval);
360 printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
361 }
362
read_brightness(void)363 static u8 read_brightness(void)
364 {
365 struct sabi_retval sretval;
366 int user_brightness = 0;
367 int retval;
368
369 retval = sabi_get_command(sabi_config->commands.get_brightness,
370 &sretval);
371 if (!retval) {
372 user_brightness = sretval.retval[0];
373 if (user_brightness != 0)
374 user_brightness -= sabi_config->min_brightness;
375 }
376 return user_brightness;
377 }
378
set_brightness(u8 user_brightness)379 static void set_brightness(u8 user_brightness)
380 {
381 u8 user_level = user_brightness - sabi_config->min_brightness;
382
383 sabi_set_command(sabi_config->commands.set_brightness, user_level);
384 }
385
get_brightness(struct backlight_device * bd)386 static int get_brightness(struct backlight_device *bd)
387 {
388 return (int)read_brightness();
389 }
390
update_status(struct backlight_device * bd)391 static int update_status(struct backlight_device *bd)
392 {
393 set_brightness(bd->props.brightness);
394
395 if (bd->props.power == FB_BLANK_UNBLANK)
396 sabi_set_command(sabi_config->commands.set_backlight, 1);
397 else
398 sabi_set_command(sabi_config->commands.set_backlight, 0);
399 return 0;
400 }
401
402 static const struct backlight_ops backlight_ops = {
403 .get_brightness = get_brightness,
404 .update_status = update_status,
405 };
406
rfkill_set(void * data,bool blocked)407 static int rfkill_set(void *data, bool blocked)
408 {
409 /* Do something with blocked...*/
410 /*
411 * blocked == false is on
412 * blocked == true is off
413 */
414 if (blocked)
415 sabi_set_command(sabi_config->commands.set_wireless_button, 0);
416 else
417 sabi_set_command(sabi_config->commands.set_wireless_button, 1);
418
419 return 0;
420 }
421
422 static struct rfkill_ops rfkill_ops = {
423 .set_block = rfkill_set,
424 };
425
init_wireless(struct platform_device * sdev)426 static int init_wireless(struct platform_device *sdev)
427 {
428 int retval;
429
430 rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
431 &rfkill_ops, NULL);
432 if (!rfk)
433 return -ENOMEM;
434
435 retval = rfkill_register(rfk);
436 if (retval) {
437 rfkill_destroy(rfk);
438 return -ENODEV;
439 }
440
441 return 0;
442 }
443
destroy_wireless(void)444 static void destroy_wireless(void)
445 {
446 rfkill_unregister(rfk);
447 rfkill_destroy(rfk);
448 }
449
get_performance_level(struct device * dev,struct device_attribute * attr,char * buf)450 static ssize_t get_performance_level(struct device *dev,
451 struct device_attribute *attr, char *buf)
452 {
453 struct sabi_retval sretval;
454 int retval;
455 int i;
456
457 /* Read the state */
458 retval = sabi_get_command(sabi_config->commands.get_performance_level,
459 &sretval);
460 if (retval)
461 return retval;
462
463 /* The logic is backwards, yeah, lots of fun... */
464 for (i = 0; sabi_config->performance_levels[i].name; ++i) {
465 if (sretval.retval[0] == sabi_config->performance_levels[i].value)
466 return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name);
467 }
468 return sprintf(buf, "%s\n", "unknown");
469 }
470
set_performance_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)471 static ssize_t set_performance_level(struct device *dev,
472 struct device_attribute *attr, const char *buf,
473 size_t count)
474 {
475 if (count >= 1) {
476 int i;
477 for (i = 0; sabi_config->performance_levels[i].name; ++i) {
478 const struct sabi_performance_level *level =
479 &sabi_config->performance_levels[i];
480 if (!strncasecmp(level->name, buf, strlen(level->name))) {
481 sabi_set_command(sabi_config->commands.set_performance_level,
482 level->value);
483 break;
484 }
485 }
486 if (!sabi_config->performance_levels[i].name)
487 return -EINVAL;
488 }
489 return count;
490 }
491 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
492 get_performance_level, set_performance_level);
493
494
dmi_check_cb(const struct dmi_system_id * id)495 static int __init dmi_check_cb(const struct dmi_system_id *id)
496 {
497 pr_info("found laptop model '%s'\n",
498 id->ident);
499 return 1;
500 }
501
502 static struct dmi_system_id __initdata samsung_dmi_table[] = {
503 {
504 .ident = "N128",
505 .matches = {
506 DMI_MATCH(DMI_SYS_VENDOR,
507 "SAMSUNG ELECTRONICS CO., LTD."),
508 DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
509 DMI_MATCH(DMI_BOARD_NAME, "N128"),
510 },
511 .callback = dmi_check_cb,
512 },
513 {
514 .ident = "N130",
515 .matches = {
516 DMI_MATCH(DMI_SYS_VENDOR,
517 "SAMSUNG ELECTRONICS CO., LTD."),
518 DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
519 DMI_MATCH(DMI_BOARD_NAME, "N130"),
520 },
521 .callback = dmi_check_cb,
522 },
523 {
524 .ident = "X125",
525 .matches = {
526 DMI_MATCH(DMI_SYS_VENDOR,
527 "SAMSUNG ELECTRONICS CO., LTD."),
528 DMI_MATCH(DMI_PRODUCT_NAME, "X125"),
529 DMI_MATCH(DMI_BOARD_NAME, "X125"),
530 },
531 .callback = dmi_check_cb,
532 },
533 {
534 .ident = "X120/X170",
535 .matches = {
536 DMI_MATCH(DMI_SYS_VENDOR,
537 "SAMSUNG ELECTRONICS CO., LTD."),
538 DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"),
539 DMI_MATCH(DMI_BOARD_NAME, "X120/X170"),
540 },
541 .callback = dmi_check_cb,
542 },
543 {
544 .ident = "NC10",
545 .matches = {
546 DMI_MATCH(DMI_SYS_VENDOR,
547 "SAMSUNG ELECTRONICS CO., LTD."),
548 DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
549 DMI_MATCH(DMI_BOARD_NAME, "NC10"),
550 },
551 .callback = dmi_check_cb,
552 },
553 {
554 .ident = "NP-Q45",
555 .matches = {
556 DMI_MATCH(DMI_SYS_VENDOR,
557 "SAMSUNG ELECTRONICS CO., LTD."),
558 DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
559 DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
560 },
561 .callback = dmi_check_cb,
562 },
563 {
564 .ident = "X360",
565 .matches = {
566 DMI_MATCH(DMI_SYS_VENDOR,
567 "SAMSUNG ELECTRONICS CO., LTD."),
568 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
569 DMI_MATCH(DMI_BOARD_NAME, "X360"),
570 },
571 .callback = dmi_check_cb,
572 },
573 {
574 .ident = "R410 Plus",
575 .matches = {
576 DMI_MATCH(DMI_SYS_VENDOR,
577 "SAMSUNG ELECTRONICS CO., LTD."),
578 DMI_MATCH(DMI_PRODUCT_NAME, "R410P"),
579 DMI_MATCH(DMI_BOARD_NAME, "R460"),
580 },
581 .callback = dmi_check_cb,
582 },
583 {
584 .ident = "R518",
585 .matches = {
586 DMI_MATCH(DMI_SYS_VENDOR,
587 "SAMSUNG ELECTRONICS CO., LTD."),
588 DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
589 DMI_MATCH(DMI_BOARD_NAME, "R518"),
590 },
591 .callback = dmi_check_cb,
592 },
593 {
594 .ident = "R519/R719",
595 .matches = {
596 DMI_MATCH(DMI_SYS_VENDOR,
597 "SAMSUNG ELECTRONICS CO., LTD."),
598 DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"),
599 DMI_MATCH(DMI_BOARD_NAME, "R519/R719"),
600 },
601 .callback = dmi_check_cb,
602 },
603 {
604 .ident = "N150/N210/N220/N230",
605 .matches = {
606 DMI_MATCH(DMI_SYS_VENDOR,
607 "SAMSUNG ELECTRONICS CO., LTD."),
608 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"),
609 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"),
610 },
611 .callback = dmi_check_cb,
612 },
613 {
614 .ident = "N150P/N210P/N220P",
615 .matches = {
616 DMI_MATCH(DMI_SYS_VENDOR,
617 "SAMSUNG ELECTRONICS CO., LTD."),
618 DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
619 DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
620 },
621 .callback = dmi_check_cb,
622 },
623 {
624 .ident = "R530/R730",
625 .matches = {
626 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
627 DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"),
628 DMI_MATCH(DMI_BOARD_NAME, "R530/R730"),
629 },
630 .callback = dmi_check_cb,
631 },
632 {
633 .ident = "NF110/NF210/NF310",
634 .matches = {
635 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
636 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
637 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
638 },
639 .callback = dmi_check_cb,
640 },
641 {
642 .ident = "N145P/N250P/N260P",
643 .matches = {
644 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
645 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
646 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
647 },
648 .callback = dmi_check_cb,
649 },
650 {
651 .ident = "R70/R71",
652 .matches = {
653 DMI_MATCH(DMI_SYS_VENDOR,
654 "SAMSUNG ELECTRONICS CO., LTD."),
655 DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"),
656 DMI_MATCH(DMI_BOARD_NAME, "R70/R71"),
657 },
658 .callback = dmi_check_cb,
659 },
660 {
661 .ident = "P460",
662 .matches = {
663 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
664 DMI_MATCH(DMI_PRODUCT_NAME, "P460"),
665 DMI_MATCH(DMI_BOARD_NAME, "P460"),
666 },
667 .callback = dmi_check_cb,
668 },
669 { },
670 };
671 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
672
find_signature(void __iomem * memcheck,const char * testStr)673 static int find_signature(void __iomem *memcheck, const char *testStr)
674 {
675 int i = 0;
676 int loca;
677
678 for (loca = 0; loca < 0xffff; loca++) {
679 char temp = readb(memcheck + loca);
680
681 if (temp == testStr[i]) {
682 if (i == strlen(testStr)-1)
683 break;
684 ++i;
685 } else {
686 i = 0;
687 }
688 }
689 return loca;
690 }
691
samsung_init(void)692 static int __init samsung_init(void)
693 {
694 struct backlight_properties props;
695 struct sabi_retval sretval;
696 unsigned int ifaceP;
697 int i;
698 int loca;
699 int retval;
700
701 mutex_init(&sabi_mutex);
702
703 if (!force && !dmi_check_system(samsung_dmi_table))
704 return -ENODEV;
705
706 f0000_segment = ioremap_nocache(0xf0000, 0xffff);
707 if (!f0000_segment) {
708 pr_err("Can't map the segment at 0xf0000\n");
709 return -EINVAL;
710 }
711
712 /* Try to find one of the signatures in memory to find the header */
713 for (i = 0; sabi_configs[i].test_string != 0; ++i) {
714 sabi_config = &sabi_configs[i];
715 loca = find_signature(f0000_segment, sabi_config->test_string);
716 if (loca != 0xffff)
717 break;
718 }
719
720 if (loca == 0xffff) {
721 pr_err("This computer does not support SABI\n");
722 goto error_no_signature;
723 }
724
725 /* point to the SMI port Number */
726 loca += 1;
727 sabi = (f0000_segment + loca);
728
729 if (debug) {
730 printk(KERN_DEBUG "This computer supports SABI==%x\n",
731 loca + 0xf0000 - 6);
732 printk(KERN_DEBUG "SABI header:\n");
733 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
734 readw(sabi + sabi_config->header_offsets.port));
735 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
736 readb(sabi + sabi_config->header_offsets.iface_func));
737 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
738 readb(sabi + sabi_config->header_offsets.en_mem));
739 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
740 readb(sabi + sabi_config->header_offsets.re_mem));
741 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
742 readw(sabi + sabi_config->header_offsets.data_offset));
743 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
744 readw(sabi + sabi_config->header_offsets.data_segment));
745 }
746
747 /* Get a pointer to the SABI Interface */
748 ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;
749 ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;
750 sabi_iface = ioremap_nocache(ifaceP, 16);
751 if (!sabi_iface) {
752 pr_err("Can't remap %x\n", ifaceP);
753 goto exit;
754 }
755 if (debug) {
756 printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
757 printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
758
759 test_backlight();
760 test_wireless();
761
762 retval = sabi_get_command(sabi_config->commands.get_brightness,
763 &sretval);
764 printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
765 }
766
767 /* Turn on "Linux" mode in the BIOS */
768 if (sabi_config->commands.set_linux != 0xff) {
769 retval = sabi_set_command(sabi_config->commands.set_linux,
770 0x81);
771 if (retval) {
772 pr_warn("Linux mode was not set!\n");
773 goto error_no_platform;
774 }
775 }
776
777 /* knock up a platform device to hang stuff off of */
778 sdev = platform_device_register_simple("samsung", -1, NULL, 0);
779 if (IS_ERR(sdev))
780 goto error_no_platform;
781
782 /* create a backlight device to talk to this one */
783 memset(&props, 0, sizeof(struct backlight_properties));
784 props.type = BACKLIGHT_PLATFORM;
785 props.max_brightness = sabi_config->max_brightness;
786 backlight_device = backlight_device_register("samsung", &sdev->dev,
787 NULL, &backlight_ops,
788 &props);
789 if (IS_ERR(backlight_device))
790 goto error_no_backlight;
791
792 backlight_device->props.brightness = read_brightness();
793 backlight_device->props.power = FB_BLANK_UNBLANK;
794 backlight_update_status(backlight_device);
795
796 retval = init_wireless(sdev);
797 if (retval)
798 goto error_no_rfk;
799
800 retval = device_create_file(&sdev->dev, &dev_attr_performance_level);
801 if (retval)
802 goto error_file_create;
803
804 exit:
805 return 0;
806
807 error_file_create:
808 destroy_wireless();
809
810 error_no_rfk:
811 backlight_device_unregister(backlight_device);
812
813 error_no_backlight:
814 platform_device_unregister(sdev);
815
816 error_no_platform:
817 iounmap(sabi_iface);
818
819 error_no_signature:
820 iounmap(f0000_segment);
821 return -EINVAL;
822 }
823
samsung_exit(void)824 static void __exit samsung_exit(void)
825 {
826 /* Turn off "Linux" mode in the BIOS */
827 if (sabi_config->commands.set_linux != 0xff)
828 sabi_set_command(sabi_config->commands.set_linux, 0x80);
829
830 device_remove_file(&sdev->dev, &dev_attr_performance_level);
831 backlight_device_unregister(backlight_device);
832 destroy_wireless();
833 iounmap(sabi_iface);
834 iounmap(f0000_segment);
835 platform_device_unregister(sdev);
836 }
837
838 module_init(samsung_init);
839 module_exit(samsung_exit);
840
841 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
842 MODULE_DESCRIPTION("Samsung Backlight driver");
843 MODULE_LICENSE("GPL");
844