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d189164a GKH |
1 | /* |
2 | * Samsung N130 Laptop driver | |
3 | * | |
4 | * Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de) | |
5 | * Copyright (C) 2009 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 | */ | |
d189164a GKH |
12 | #include <linux/kernel.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/pci.h> | |
17 | #include <linux/backlight.h> | |
18 | #include <linux/fb.h> | |
19 | #include <linux/dmi.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/rfkill.h> | |
22 | ||
23 | /* | |
24 | * This driver is needed because a number of Samsung laptops do not hook | |
25 | * their control settings through ACPI. So we have to poke around in the | |
26 | * BIOS to do things like brightness values, and "special" key controls. | |
27 | */ | |
28 | ||
29 | /* | |
30 | * We have 0 - 8 as valid brightness levels. The specs say that level 0 should | |
31 | * be reserved by the BIOS (which really doesn't make much sense), we tell | |
32 | * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8 | |
33 | */ | |
34 | #define MAX_BRIGHT 0x07 | |
35 | ||
36 | /* Brightness is 0 - 8, as described above. Value 0 is for the BIOS to use */ | |
37 | #define GET_BRIGHTNESS 0x00 | |
38 | #define SET_BRIGHTNESS 0x01 | |
39 | ||
40 | /* first byte: | |
41 | * 0x00 - wireless is off | |
42 | * 0x01 - wireless is on | |
43 | * second byte: | |
44 | * 0x02 - 3G is off | |
45 | * 0x03 - 3G is on | |
46 | * TODO, verify 3G is correct, that doesn't seem right... | |
47 | */ | |
48 | #define GET_WIRELESS_BUTTON 0x02 | |
49 | #define SET_WIRELESS_BUTTON 0x03 | |
50 | ||
51 | /* 0 is off, 1 is on */ | |
52 | #define GET_BACKLIGHT 0x04 | |
53 | #define SET_BACKLIGHT 0x05 | |
54 | ||
55 | /* | |
56 | * 0x80 or 0x00 - no action | |
57 | * 0x81 - recovery key pressed | |
58 | */ | |
59 | #define GET_RECOVERY_METHOD 0x06 | |
60 | #define SET_RECOVERY_METHOD 0x07 | |
61 | ||
62 | /* 0 is low, 1 is high */ | |
63 | #define GET_PERFORMANCE_LEVEL 0x08 | |
64 | #define SET_PERFORMANCE_LEVEL 0x09 | |
65 | ||
66 | /* | |
67 | * Tell the BIOS that Linux is running on this machine. | |
68 | * 81 is on, 80 is off | |
69 | */ | |
70 | #define SET_LINUX 0x0a | |
71 | ||
72 | ||
73 | #define MAIN_FUNCTION 0x4c49 | |
74 | ||
75 | #define SABI_HEADER_PORT 0x00 | |
76 | #define SABI_HEADER_RE_MEM 0x02 | |
77 | #define SABI_HEADER_IFACEFUNC 0x03 | |
78 | #define SABI_HEADER_EN_MEM 0x04 | |
79 | #define SABI_HEADER_DATA_OFFSET 0x05 | |
80 | #define SABI_HEADER_DATA_SEGMENT 0x07 | |
81 | ||
82 | #define SABI_IFACE_MAIN 0x00 | |
83 | #define SABI_IFACE_SUB 0x02 | |
84 | #define SABI_IFACE_COMPLETE 0x04 | |
85 | #define SABI_IFACE_DATA 0x05 | |
86 | ||
87 | /* Structure to get data back to the calling function */ | |
88 | struct sabi_retval { | |
89 | u8 retval[20]; | |
90 | }; | |
91 | ||
92 | static void __iomem *sabi; | |
93 | static void __iomem *sabi_iface; | |
94 | static void __iomem *f0000_segment; | |
95 | static struct backlight_device *backlight_device; | |
96 | static struct mutex sabi_mutex; | |
97 | static struct platform_device *sdev; | |
98 | static struct rfkill *rfk; | |
99 | ||
100 | static int force; | |
101 | module_param(force, bool, 0); | |
102 | MODULE_PARM_DESC(force, "Disable the DMI check and forces the driver to be loaded"); | |
103 | ||
104 | static int debug; | |
105 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
106 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
107 | ||
108 | static int sabi_get_command(u8 command, struct sabi_retval *sretval) | |
109 | { | |
110 | int retval = 0; | |
111 | u16 port = readw(sabi + SABI_HEADER_PORT); | |
112 | ||
113 | mutex_lock(&sabi_mutex); | |
114 | ||
115 | /* enable memory to be able to write to it */ | |
116 | outb(readb(sabi + SABI_HEADER_EN_MEM), port); | |
117 | ||
118 | /* write out the command */ | |
119 | writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN); | |
120 | writew(command, sabi_iface + SABI_IFACE_SUB); | |
121 | writeb(0, sabi_iface + SABI_IFACE_COMPLETE); | |
122 | outb(readb(sabi + SABI_HEADER_IFACEFUNC), port); | |
123 | ||
124 | /* write protect memory to make it safe */ | |
125 | outb(readb(sabi + SABI_HEADER_RE_MEM), port); | |
126 | ||
127 | /* see if the command actually succeeded */ | |
128 | if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa && | |
129 | readb(sabi_iface + SABI_IFACE_DATA) != 0xff) { | |
130 | /* | |
131 | * It did! | |
132 | * Save off the data into a structure so the caller use it. | |
133 | * Right now we only care about the first 4 bytes, | |
134 | * I suppose there are commands that need more, but I don't | |
135 | * know about them. | |
136 | */ | |
137 | sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA); | |
138 | sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1); | |
139 | sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2); | |
140 | sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3); | |
141 | goto exit; | |
142 | } | |
143 | ||
144 | /* Something bad happened, so report it and error out */ | |
145 | printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n", | |
146 | command, readb(sabi_iface + SABI_IFACE_COMPLETE), | |
147 | readb(sabi_iface + SABI_IFACE_DATA)); | |
148 | retval = -EINVAL; | |
149 | exit: | |
150 | mutex_unlock(&sabi_mutex); | |
151 | return retval; | |
152 | ||
153 | } | |
154 | ||
155 | static int sabi_set_command(u8 command, u8 data) | |
156 | { | |
157 | int retval = 0; | |
158 | u16 port = readw(sabi + SABI_HEADER_PORT); | |
159 | ||
160 | mutex_lock(&sabi_mutex); | |
161 | ||
162 | /* enable memory to be able to write to it */ | |
163 | outb(readb(sabi + SABI_HEADER_EN_MEM), port); | |
164 | ||
165 | /* write out the command */ | |
166 | writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN); | |
167 | writew(command, sabi_iface + SABI_IFACE_SUB); | |
168 | writeb(0, sabi_iface + SABI_IFACE_COMPLETE); | |
169 | writeb(data, sabi_iface + SABI_IFACE_DATA); | |
170 | outb(readb(sabi + SABI_HEADER_IFACEFUNC), port); | |
171 | ||
172 | /* write protect memory to make it safe */ | |
173 | outb(readb(sabi + SABI_HEADER_RE_MEM), port); | |
174 | ||
175 | /* see if the command actually succeeded */ | |
176 | if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa && | |
177 | readb(sabi_iface + SABI_IFACE_DATA) != 0xff) { | |
178 | /* it did! */ | |
179 | goto exit; | |
180 | } | |
181 | ||
182 | /* Something bad happened, so report it and error out */ | |
183 | printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n", | |
184 | command, readb(sabi_iface + SABI_IFACE_COMPLETE), | |
185 | readb(sabi_iface + SABI_IFACE_DATA)); | |
186 | retval = -EINVAL; | |
187 | exit: | |
188 | mutex_unlock(&sabi_mutex); | |
189 | return retval; | |
190 | } | |
191 | ||
192 | static void test_backlight(void) | |
193 | { | |
194 | struct sabi_retval sretval; | |
195 | ||
196 | sabi_get_command(GET_BACKLIGHT, &sretval); | |
197 | printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); | |
198 | ||
199 | sabi_set_command(SET_BACKLIGHT, 0); | |
200 | printk(KERN_DEBUG "backlight should be off\n"); | |
201 | ||
202 | sabi_get_command(GET_BACKLIGHT, &sretval); | |
203 | printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); | |
204 | ||
205 | msleep(1000); | |
206 | ||
207 | sabi_set_command(SET_BACKLIGHT, 1); | |
208 | printk(KERN_DEBUG "backlight should be on\n"); | |
209 | ||
210 | sabi_get_command(GET_BACKLIGHT, &sretval); | |
211 | printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); | |
212 | } | |
213 | ||
214 | static void test_wireless(void) | |
215 | { | |
216 | struct sabi_retval sretval; | |
217 | ||
218 | sabi_get_command(GET_WIRELESS_BUTTON, &sretval); | |
219 | printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); | |
220 | ||
221 | sabi_set_command(SET_WIRELESS_BUTTON, 0); | |
222 | printk(KERN_DEBUG "wireless led should be off\n"); | |
223 | ||
224 | sabi_get_command(GET_WIRELESS_BUTTON, &sretval); | |
225 | printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); | |
226 | ||
227 | msleep(1000); | |
228 | ||
229 | sabi_set_command(SET_WIRELESS_BUTTON, 1); | |
230 | printk(KERN_DEBUG "wireless led should be on\n"); | |
231 | ||
232 | sabi_get_command(GET_WIRELESS_BUTTON, &sretval); | |
233 | printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); | |
234 | } | |
235 | ||
236 | static u8 read_brightness(void) | |
237 | { | |
238 | struct sabi_retval sretval; | |
239 | int user_brightness = 0; | |
240 | int retval; | |
241 | ||
242 | retval = sabi_get_command(GET_BRIGHTNESS, &sretval); | |
243 | if (!retval) | |
244 | user_brightness = sretval.retval[0]; | |
245 | if (user_brightness != 0) | |
246 | --user_brightness; | |
247 | return user_brightness; | |
248 | } | |
249 | ||
250 | static void set_brightness(u8 user_brightness) | |
251 | { | |
252 | sabi_set_command(SET_BRIGHTNESS, user_brightness + 1); | |
253 | } | |
254 | ||
255 | static int get_brightness(struct backlight_device *bd) | |
256 | { | |
257 | return (int)read_brightness(); | |
258 | } | |
259 | ||
260 | static int update_status(struct backlight_device *bd) | |
261 | { | |
262 | set_brightness(bd->props.brightness); | |
263 | ||
264 | if (bd->props.power == FB_BLANK_UNBLANK) | |
265 | sabi_set_command(SET_BACKLIGHT, 1); | |
266 | else | |
267 | sabi_set_command(SET_BACKLIGHT, 0); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static struct backlight_ops backlight_ops = { | |
272 | .get_brightness = get_brightness, | |
273 | .update_status = update_status, | |
274 | }; | |
275 | ||
d189164a GKH |
276 | static int rfkill_set(void *data, bool blocked) |
277 | { | |
278 | /* Do something with blocked...*/ | |
279 | /* | |
280 | * blocked == false is on | |
281 | * blocked == true is off | |
282 | */ | |
283 | if (blocked) | |
284 | sabi_set_command(SET_WIRELESS_BUTTON, 0); | |
285 | else | |
286 | sabi_set_command(SET_WIRELESS_BUTTON, 1); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static struct rfkill_ops rfkill_ops = { | |
292 | .set_block = rfkill_set, | |
293 | }; | |
294 | ||
295 | static int init_wireless(struct platform_device *sdev) | |
296 | { | |
297 | int retval; | |
298 | ||
299 | rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN, | |
300 | &rfkill_ops, NULL); | |
301 | if (!rfk) | |
302 | return -ENOMEM; | |
303 | ||
304 | retval = rfkill_register(rfk); | |
305 | if (retval) { | |
306 | rfkill_destroy(rfk); | |
307 | return -ENODEV; | |
308 | } | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static void destroy_wireless(void) | |
314 | { | |
315 | rfkill_unregister(rfk); | |
316 | rfkill_destroy(rfk); | |
317 | } | |
318 | ||
d189164a GKH |
319 | static ssize_t get_silent_state(struct device *dev, |
320 | struct device_attribute *attr, char *buf) | |
321 | { | |
322 | struct sabi_retval sretval; | |
323 | int retval; | |
324 | ||
325 | /* Read the state */ | |
326 | retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval); | |
327 | if (retval) | |
328 | return retval; | |
329 | ||
330 | /* The logic is backwards, yeah, lots of fun... */ | |
331 | if (sretval.retval[0] == 0) | |
332 | retval = 1; | |
333 | else | |
334 | retval = 0; | |
335 | return sprintf(buf, "%d\n", retval); | |
336 | } | |
337 | ||
338 | static ssize_t set_silent_state(struct device *dev, | |
339 | struct device_attribute *attr, const char *buf, | |
340 | size_t count) | |
341 | { | |
342 | char value; | |
343 | ||
344 | if (count >= 1) { | |
345 | value = buf[0]; | |
346 | if ((value == '0') || (value == 'n') || (value == 'N')) { | |
347 | /* Turn speed up */ | |
348 | sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01); | |
349 | } else if ((value == '1') || (value == 'y') || (value == 'Y')) { | |
350 | /* Turn speed down */ | |
351 | sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00); | |
352 | } else { | |
353 | return -EINVAL; | |
354 | } | |
355 | } | |
356 | return count; | |
357 | } | |
358 | static DEVICE_ATTR(silent, S_IWUGO | S_IRUGO, | |
359 | get_silent_state, set_silent_state); | |
360 | ||
361 | ||
362 | static int __init dmi_check_cb(const struct dmi_system_id *id) | |
363 | { | |
364 | printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n", | |
365 | id->ident); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static struct dmi_system_id __initdata samsung_dmi_table[] = { | |
370 | { | |
371 | .ident = "N128", | |
372 | .matches = { | |
373 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
374 | DMI_MATCH(DMI_PRODUCT_NAME, "N128"), | |
375 | DMI_MATCH(DMI_BOARD_NAME, "N128"), | |
376 | }, | |
377 | .callback = dmi_check_cb, | |
378 | }, | |
379 | { | |
380 | .ident = "N130", | |
381 | .matches = { | |
382 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
383 | DMI_MATCH(DMI_PRODUCT_NAME, "N130"), | |
384 | DMI_MATCH(DMI_BOARD_NAME, "N130"), | |
385 | }, | |
386 | .callback = dmi_check_cb, | |
387 | }, | |
388 | { }, | |
389 | }; | |
390 | MODULE_DEVICE_TABLE(dmi, samsung_dmi_table); | |
391 | ||
392 | static int __init samsung_init(void) | |
393 | { | |
394 | struct sabi_retval sretval; | |
395 | const char *testStr = "SECLINUX"; | |
396 | void __iomem *memcheck; | |
397 | unsigned int ifaceP; | |
398 | int pStr; | |
399 | int loca; | |
400 | int retval; | |
401 | ||
402 | mutex_init(&sabi_mutex); | |
403 | ||
404 | if (!force && !dmi_check_system(samsung_dmi_table)) | |
405 | return -ENODEV; | |
406 | ||
407 | f0000_segment = ioremap(0xf0000, 0xffff); | |
408 | if (!f0000_segment) { | |
409 | printk(KERN_ERR "Can't map the segment at 0xf0000\n"); | |
410 | return -EINVAL; | |
411 | } | |
412 | ||
413 | /* Try to find the signature "SECLINUX" in memory to find the header */ | |
414 | pStr = 0; | |
415 | memcheck = f0000_segment; | |
416 | for (loca = 0; loca < 0xffff; loca++) { | |
417 | char temp = readb(memcheck + loca); | |
418 | ||
419 | if (temp == testStr[pStr]) { | |
420 | if (pStr == strlen(testStr)-1) | |
421 | break; | |
422 | ++pStr; | |
423 | } else { | |
424 | pStr = 0; | |
425 | } | |
426 | } | |
427 | if (loca == 0xffff) { | |
428 | printk(KERN_ERR "This computer does not support SABI\n"); | |
429 | goto error_no_signature; | |
430 | } | |
431 | ||
432 | /* point to the SMI port Number */ | |
433 | loca += 1; | |
434 | sabi = (memcheck + loca); | |
435 | ||
436 | if (debug) { | |
437 | printk(KERN_DEBUG "This computer supports SABI==%x\n", | |
438 | loca + 0xf0000 - 6); | |
439 | printk(KERN_DEBUG "SABI header:\n"); | |
440 | printk(KERN_DEBUG " SMI Port Number = 0x%04x\n", | |
441 | readw(sabi + SABI_HEADER_PORT)); | |
442 | printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n", | |
443 | readb(sabi + SABI_HEADER_IFACEFUNC)); | |
444 | printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n", | |
445 | readb(sabi + SABI_HEADER_EN_MEM)); | |
446 | printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n", | |
447 | readb(sabi + SABI_HEADER_RE_MEM)); | |
448 | printk(KERN_DEBUG " SABI data offset = 0x%04x\n", | |
449 | readw(sabi + SABI_HEADER_DATA_OFFSET)); | |
450 | printk(KERN_DEBUG " SABI data segment = 0x%04x\n", | |
451 | readw(sabi + SABI_HEADER_DATA_SEGMENT)); | |
452 | } | |
453 | ||
454 | /* Get a pointer to the SABI Interface */ | |
455 | ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4; | |
456 | ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff; | |
457 | sabi_iface = ioremap(ifaceP, 16); | |
458 | if (!sabi_iface) { | |
459 | printk(KERN_ERR "Can't remap %x\n", ifaceP); | |
460 | goto exit; | |
461 | } | |
462 | if (debug) { | |
463 | printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP); | |
464 | printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface); | |
465 | ||
466 | test_backlight(); | |
467 | test_wireless(); | |
468 | ||
469 | retval = sabi_get_command(GET_BRIGHTNESS, &sretval); | |
470 | printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]); | |
471 | } | |
472 | ||
473 | /* Turn on "Linux" mode in the BIOS */ | |
474 | retval = sabi_set_command(SET_LINUX, 0x81); | |
475 | if (retval) { | |
476 | printk(KERN_ERR KBUILD_MODNAME ": Linux mode was not set!\n"); | |
477 | goto error_no_platform; | |
478 | } | |
479 | ||
480 | /* knock up a platform device to hang stuff off of */ | |
481 | sdev = platform_device_register_simple("samsung", -1, NULL, 0); | |
482 | if (IS_ERR(sdev)) | |
483 | goto error_no_platform; | |
484 | ||
485 | /* create a backlight device to talk to this one */ | |
486 | backlight_device = backlight_device_register("samsung", &sdev->dev, | |
487 | NULL, &backlight_ops); | |
488 | if (IS_ERR(backlight_device)) | |
489 | goto error_no_backlight; | |
490 | ||
491 | backlight_device->props.max_brightness = MAX_BRIGHT; | |
492 | backlight_device->props.brightness = read_brightness(); | |
493 | backlight_device->props.power = FB_BLANK_UNBLANK; | |
494 | backlight_update_status(backlight_device); | |
495 | ||
496 | retval = init_wireless(sdev); | |
497 | if (retval) | |
498 | goto error_no_rfk; | |
499 | ||
500 | retval = device_create_file(&sdev->dev, &dev_attr_silent); | |
501 | if (retval) | |
502 | goto error_file_create; | |
503 | ||
504 | exit: | |
505 | return 0; | |
506 | ||
507 | error_file_create: | |
508 | destroy_wireless(); | |
509 | ||
510 | error_no_rfk: | |
511 | backlight_device_unregister(backlight_device); | |
512 | ||
513 | error_no_backlight: | |
514 | platform_device_unregister(sdev); | |
515 | ||
516 | error_no_platform: | |
517 | iounmap(sabi_iface); | |
518 | ||
519 | error_no_signature: | |
520 | iounmap(f0000_segment); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
524 | static void __exit samsung_exit(void) | |
525 | { | |
526 | /* Turn off "Linux" mode in the BIOS */ | |
527 | sabi_set_command(SET_LINUX, 0x80); | |
528 | ||
529 | device_remove_file(&sdev->dev, &dev_attr_silent); | |
530 | backlight_device_unregister(backlight_device); | |
531 | destroy_wireless(); | |
532 | iounmap(sabi_iface); | |
533 | iounmap(f0000_segment); | |
534 | platform_device_unregister(sdev); | |
535 | } | |
536 | ||
537 | module_init(samsung_init); | |
538 | module_exit(samsung_exit); | |
539 | ||
540 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>"); | |
541 | MODULE_DESCRIPTION("Samsung Backlight driver"); | |
542 | MODULE_LICENSE("GPL"); |