Merge branch 'master' into percpu
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / samsung-laptop / samsung-laptop.c
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 */
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
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
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");