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dell-laptop: extract SMBIOS-related code to a separate module
[deliverable/linux.git] / drivers / platform / x86 / dell-laptop.c
1 /*
2 * Driver for Dell laptop extras
3 *
4 * Copyright (c) Red Hat <mjg@redhat.com>
5 * Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
6 * Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com>
7 *
8 * Based on documentation in the libsmbios package:
9 * Copyright (C) 2005-2014 Dell Inc.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/backlight.h>
23 #include <linux/err.h>
24 #include <linux/dmi.h>
25 #include <linux/io.h>
26 #include <linux/rfkill.h>
27 #include <linux/power_supply.h>
28 #include <linux/acpi.h>
29 #include <linux/mm.h>
30 #include <linux/i8042.h>
31 #include <linux/debugfs.h>
32 #include <linux/seq_file.h>
33 #include <acpi/video.h>
34 #include "dell-rbtn.h"
35 #include "dell-smbios.h"
36
37 #define BRIGHTNESS_TOKEN 0x7d
38 #define KBD_LED_OFF_TOKEN 0x01E1
39 #define KBD_LED_ON_TOKEN 0x01E2
40 #define KBD_LED_AUTO_TOKEN 0x01E3
41 #define KBD_LED_AUTO_25_TOKEN 0x02EA
42 #define KBD_LED_AUTO_50_TOKEN 0x02EB
43 #define KBD_LED_AUTO_75_TOKEN 0x02EC
44 #define KBD_LED_AUTO_100_TOKEN 0x02F6
45
46 struct quirk_entry {
47 u8 touchpad_led;
48
49 int needs_kbd_timeouts;
50 /*
51 * Ordered list of timeouts expressed in seconds.
52 * The list must end with -1
53 */
54 int kbd_timeouts[];
55 };
56
57 static struct quirk_entry *quirks;
58
59 static struct quirk_entry quirk_dell_vostro_v130 = {
60 .touchpad_led = 1,
61 };
62
63 static int __init dmi_matched(const struct dmi_system_id *dmi)
64 {
65 quirks = dmi->driver_data;
66 return 1;
67 }
68
69 /*
70 * These values come from Windows utility provided by Dell. If any other value
71 * is used then BIOS silently set timeout to 0 without any error message.
72 */
73 static struct quirk_entry quirk_dell_xps13_9333 = {
74 .needs_kbd_timeouts = 1,
75 .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
76 };
77
78 static struct platform_driver platform_driver = {
79 .driver = {
80 .name = "dell-laptop",
81 }
82 };
83
84 static struct platform_device *platform_device;
85 static struct backlight_device *dell_backlight_device;
86 static struct rfkill *wifi_rfkill;
87 static struct rfkill *bluetooth_rfkill;
88 static struct rfkill *wwan_rfkill;
89 static bool force_rfkill;
90
91 module_param(force_rfkill, bool, 0444);
92 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
93
94 static const struct dmi_system_id dell_device_table[] __initconst = {
95 {
96 .ident = "Dell laptop",
97 .matches = {
98 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
99 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
100 },
101 },
102 {
103 .matches = {
104 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
105 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
106 },
107 },
108 {
109 .ident = "Dell Computer Corporation",
110 .matches = {
111 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
112 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
113 },
114 },
115 { }
116 };
117 MODULE_DEVICE_TABLE(dmi, dell_device_table);
118
119 static const struct dmi_system_id dell_quirks[] __initconst = {
120 {
121 .callback = dmi_matched,
122 .ident = "Dell Vostro V130",
123 .matches = {
124 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
125 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
126 },
127 .driver_data = &quirk_dell_vostro_v130,
128 },
129 {
130 .callback = dmi_matched,
131 .ident = "Dell Vostro V131",
132 .matches = {
133 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
134 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
135 },
136 .driver_data = &quirk_dell_vostro_v130,
137 },
138 {
139 .callback = dmi_matched,
140 .ident = "Dell Vostro 3350",
141 .matches = {
142 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
143 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
144 },
145 .driver_data = &quirk_dell_vostro_v130,
146 },
147 {
148 .callback = dmi_matched,
149 .ident = "Dell Vostro 3555",
150 .matches = {
151 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
152 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
153 },
154 .driver_data = &quirk_dell_vostro_v130,
155 },
156 {
157 .callback = dmi_matched,
158 .ident = "Dell Inspiron N311z",
159 .matches = {
160 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
161 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
162 },
163 .driver_data = &quirk_dell_vostro_v130,
164 },
165 {
166 .callback = dmi_matched,
167 .ident = "Dell Inspiron M5110",
168 .matches = {
169 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
170 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
171 },
172 .driver_data = &quirk_dell_vostro_v130,
173 },
174 {
175 .callback = dmi_matched,
176 .ident = "Dell Vostro 3360",
177 .matches = {
178 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
179 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
180 },
181 .driver_data = &quirk_dell_vostro_v130,
182 },
183 {
184 .callback = dmi_matched,
185 .ident = "Dell Vostro 3460",
186 .matches = {
187 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
188 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
189 },
190 .driver_data = &quirk_dell_vostro_v130,
191 },
192 {
193 .callback = dmi_matched,
194 .ident = "Dell Vostro 3560",
195 .matches = {
196 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
197 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
198 },
199 .driver_data = &quirk_dell_vostro_v130,
200 },
201 {
202 .callback = dmi_matched,
203 .ident = "Dell Vostro 3450",
204 .matches = {
205 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
206 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
207 },
208 .driver_data = &quirk_dell_vostro_v130,
209 },
210 {
211 .callback = dmi_matched,
212 .ident = "Dell Inspiron 5420",
213 .matches = {
214 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
215 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
216 },
217 .driver_data = &quirk_dell_vostro_v130,
218 },
219 {
220 .callback = dmi_matched,
221 .ident = "Dell Inspiron 5520",
222 .matches = {
223 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
224 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
225 },
226 .driver_data = &quirk_dell_vostro_v130,
227 },
228 {
229 .callback = dmi_matched,
230 .ident = "Dell Inspiron 5720",
231 .matches = {
232 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
233 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
234 },
235 .driver_data = &quirk_dell_vostro_v130,
236 },
237 {
238 .callback = dmi_matched,
239 .ident = "Dell Inspiron 7420",
240 .matches = {
241 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
243 },
244 .driver_data = &quirk_dell_vostro_v130,
245 },
246 {
247 .callback = dmi_matched,
248 .ident = "Dell Inspiron 7520",
249 .matches = {
250 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
251 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
252 },
253 .driver_data = &quirk_dell_vostro_v130,
254 },
255 {
256 .callback = dmi_matched,
257 .ident = "Dell Inspiron 7720",
258 .matches = {
259 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
260 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
261 },
262 .driver_data = &quirk_dell_vostro_v130,
263 },
264 {
265 .callback = dmi_matched,
266 .ident = "Dell XPS13 9333",
267 .matches = {
268 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
269 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
270 },
271 .driver_data = &quirk_dell_xps13_9333,
272 },
273 { }
274 };
275
276 static inline int dell_smi_error(int value)
277 {
278 switch (value) {
279 case 0: /* Completed successfully */
280 return 0;
281 case -1: /* Completed with error */
282 return -EIO;
283 case -2: /* Function not supported */
284 return -ENXIO;
285 default: /* Unknown error */
286 return -EINVAL;
287 }
288 }
289
290 /*
291 * Derived from information in smbios-wireless-ctl:
292 *
293 * cbSelect 17, Value 11
294 *
295 * Return Wireless Info
296 * cbArg1, byte0 = 0x00
297 *
298 * cbRes1 Standard return codes (0, -1, -2)
299 * cbRes2 Info bit flags:
300 *
301 * 0 Hardware switch supported (1)
302 * 1 WiFi locator supported (1)
303 * 2 WLAN supported (1)
304 * 3 Bluetooth (BT) supported (1)
305 * 4 WWAN supported (1)
306 * 5 Wireless KBD supported (1)
307 * 6 Uw b supported (1)
308 * 7 WiGig supported (1)
309 * 8 WLAN installed (1)
310 * 9 BT installed (1)
311 * 10 WWAN installed (1)
312 * 11 Uw b installed (1)
313 * 12 WiGig installed (1)
314 * 13-15 Reserved (0)
315 * 16 Hardware (HW) switch is On (1)
316 * 17 WLAN disabled (1)
317 * 18 BT disabled (1)
318 * 19 WWAN disabled (1)
319 * 20 Uw b disabled (1)
320 * 21 WiGig disabled (1)
321 * 20-31 Reserved (0)
322 *
323 * cbRes3 NVRAM size in bytes
324 * cbRes4, byte 0 NVRAM format version number
325 *
326 *
327 * Set QuickSet Radio Disable Flag
328 * cbArg1, byte0 = 0x01
329 * cbArg1, byte1
330 * Radio ID value:
331 * 0 Radio Status
332 * 1 WLAN ID
333 * 2 BT ID
334 * 3 WWAN ID
335 * 4 UWB ID
336 * 5 WIGIG ID
337 * cbArg1, byte2 Flag bits:
338 * 0 QuickSet disables radio (1)
339 * 1-7 Reserved (0)
340 *
341 * cbRes1 Standard return codes (0, -1, -2)
342 * cbRes2 QuickSet (QS) radio disable bit map:
343 * 0 QS disables WLAN
344 * 1 QS disables BT
345 * 2 QS disables WWAN
346 * 3 QS disables UWB
347 * 4 QS disables WIGIG
348 * 5-31 Reserved (0)
349 *
350 * Wireless Switch Configuration
351 * cbArg1, byte0 = 0x02
352 *
353 * cbArg1, byte1
354 * Subcommand:
355 * 0 Get config
356 * 1 Set config
357 * 2 Set WiFi locator enable/disable
358 * cbArg1,byte2
359 * Switch settings (if byte 1==1):
360 * 0 WLAN sw itch control (1)
361 * 1 BT sw itch control (1)
362 * 2 WWAN sw itch control (1)
363 * 3 UWB sw itch control (1)
364 * 4 WiGig sw itch control (1)
365 * 5-7 Reserved (0)
366 * cbArg1, byte2 Enable bits (if byte 1==2):
367 * 0 Enable WiFi locator (1)
368 *
369 * cbRes1 Standard return codes (0, -1, -2)
370 * cbRes2 QuickSet radio disable bit map:
371 * 0 WLAN controlled by sw itch (1)
372 * 1 BT controlled by sw itch (1)
373 * 2 WWAN controlled by sw itch (1)
374 * 3 UWB controlled by sw itch (1)
375 * 4 WiGig controlled by sw itch (1)
376 * 5-6 Reserved (0)
377 * 7 Wireless sw itch config locked (1)
378 * 8 WiFi locator enabled (1)
379 * 9-14 Reserved (0)
380 * 15 WiFi locator setting locked (1)
381 * 16-31 Reserved (0)
382 *
383 * Read Local Config Data (LCD)
384 * cbArg1, byte0 = 0x10
385 * cbArg1, byte1 NVRAM index low byte
386 * cbArg1, byte2 NVRAM index high byte
387 * cbRes1 Standard return codes (0, -1, -2)
388 * cbRes2 4 bytes read from LCD[index]
389 * cbRes3 4 bytes read from LCD[index+4]
390 * cbRes4 4 bytes read from LCD[index+8]
391 *
392 * Write Local Config Data (LCD)
393 * cbArg1, byte0 = 0x11
394 * cbArg1, byte1 NVRAM index low byte
395 * cbArg1, byte2 NVRAM index high byte
396 * cbArg2 4 bytes to w rite at LCD[index]
397 * cbArg3 4 bytes to w rite at LCD[index+4]
398 * cbArg4 4 bytes to w rite at LCD[index+8]
399 * cbRes1 Standard return codes (0, -1, -2)
400 *
401 * Populate Local Config Data from NVRAM
402 * cbArg1, byte0 = 0x12
403 * cbRes1 Standard return codes (0, -1, -2)
404 *
405 * Commit Local Config Data to NVRAM
406 * cbArg1, byte0 = 0x13
407 * cbRes1 Standard return codes (0, -1, -2)
408 */
409
410 static int dell_rfkill_set(void *data, bool blocked)
411 {
412 int disable = blocked ? 1 : 0;
413 unsigned long radio = (unsigned long)data;
414 int hwswitch_bit = (unsigned long)data - 1;
415 int hwswitch;
416 int status;
417 int ret;
418
419 get_buffer();
420
421 dell_send_request(buffer, 17, 11);
422 ret = buffer->output[0];
423 status = buffer->output[1];
424
425 if (ret != 0)
426 goto out;
427
428 clear_buffer();
429
430 buffer->input[0] = 0x2;
431 dell_send_request(buffer, 17, 11);
432 ret = buffer->output[0];
433 hwswitch = buffer->output[1];
434
435 /* If the hardware switch controls this radio, and the hardware
436 switch is disabled, always disable the radio */
437 if (ret == 0 && (hwswitch & BIT(hwswitch_bit)) &&
438 (status & BIT(0)) && !(status & BIT(16)))
439 disable = 1;
440
441 clear_buffer();
442
443 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
444 dell_send_request(buffer, 17, 11);
445 ret = buffer->output[0];
446
447 out:
448 release_buffer();
449 return dell_smi_error(ret);
450 }
451
452 /* Must be called with the buffer held */
453 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
454 int status)
455 {
456 if (status & BIT(0)) {
457 /* Has hw-switch, sync sw_state to BIOS */
458 int block = rfkill_blocked(rfkill);
459 clear_buffer();
460 buffer->input[0] = (1 | (radio << 8) | (block << 16));
461 dell_send_request(buffer, 17, 11);
462 } else {
463 /* No hw-switch, sync BIOS state to sw_state */
464 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
465 }
466 }
467
468 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
469 int status, int hwswitch)
470 {
471 if (hwswitch & (BIT(radio - 1)))
472 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
473 }
474
475 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
476 {
477 int radio = ((unsigned long)data & 0xF);
478 int hwswitch;
479 int status;
480 int ret;
481
482 get_buffer();
483
484 dell_send_request(buffer, 17, 11);
485 ret = buffer->output[0];
486 status = buffer->output[1];
487
488 if (ret != 0 || !(status & BIT(0))) {
489 release_buffer();
490 return;
491 }
492
493 clear_buffer();
494
495 buffer->input[0] = 0x2;
496 dell_send_request(buffer, 17, 11);
497 ret = buffer->output[0];
498 hwswitch = buffer->output[1];
499
500 release_buffer();
501
502 if (ret != 0)
503 return;
504
505 dell_rfkill_update_hw_state(rfkill, radio, status, hwswitch);
506 }
507
508 static const struct rfkill_ops dell_rfkill_ops = {
509 .set_block = dell_rfkill_set,
510 .query = dell_rfkill_query,
511 };
512
513 static struct dentry *dell_laptop_dir;
514
515 static int dell_debugfs_show(struct seq_file *s, void *data)
516 {
517 int hwswitch_state;
518 int hwswitch_ret;
519 int status;
520 int ret;
521
522 get_buffer();
523
524 dell_send_request(buffer, 17, 11);
525 ret = buffer->output[0];
526 status = buffer->output[1];
527
528 clear_buffer();
529
530 buffer->input[0] = 0x2;
531 dell_send_request(buffer, 17, 11);
532 hwswitch_ret = buffer->output[0];
533 hwswitch_state = buffer->output[1];
534
535 release_buffer();
536
537 seq_printf(s, "return:\t%d\n", ret);
538 seq_printf(s, "status:\t0x%X\n", status);
539 seq_printf(s, "Bit 0 : Hardware switch supported: %lu\n",
540 status & BIT(0));
541 seq_printf(s, "Bit 1 : Wifi locator supported: %lu\n",
542 (status & BIT(1)) >> 1);
543 seq_printf(s, "Bit 2 : Wifi is supported: %lu\n",
544 (status & BIT(2)) >> 2);
545 seq_printf(s, "Bit 3 : Bluetooth is supported: %lu\n",
546 (status & BIT(3)) >> 3);
547 seq_printf(s, "Bit 4 : WWAN is supported: %lu\n",
548 (status & BIT(4)) >> 4);
549 seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
550 (status & BIT(5)) >> 5);
551 seq_printf(s, "Bit 6 : UWB supported: %lu\n",
552 (status & BIT(6)) >> 6);
553 seq_printf(s, "Bit 7 : WiGig supported: %lu\n",
554 (status & BIT(7)) >> 7);
555 seq_printf(s, "Bit 8 : Wifi is installed: %lu\n",
556 (status & BIT(8)) >> 8);
557 seq_printf(s, "Bit 9 : Bluetooth is installed: %lu\n",
558 (status & BIT(9)) >> 9);
559 seq_printf(s, "Bit 10: WWAN is installed: %lu\n",
560 (status & BIT(10)) >> 10);
561 seq_printf(s, "Bit 11: UWB installed: %lu\n",
562 (status & BIT(11)) >> 11);
563 seq_printf(s, "Bit 12: WiGig installed: %lu\n",
564 (status & BIT(12)) >> 12);
565
566 seq_printf(s, "Bit 16: Hardware switch is on: %lu\n",
567 (status & BIT(16)) >> 16);
568 seq_printf(s, "Bit 17: Wifi is blocked: %lu\n",
569 (status & BIT(17)) >> 17);
570 seq_printf(s, "Bit 18: Bluetooth is blocked: %lu\n",
571 (status & BIT(18)) >> 18);
572 seq_printf(s, "Bit 19: WWAN is blocked: %lu\n",
573 (status & BIT(19)) >> 19);
574 seq_printf(s, "Bit 20: UWB is blocked: %lu\n",
575 (status & BIT(20)) >> 20);
576 seq_printf(s, "Bit 21: WiGig is blocked: %lu\n",
577 (status & BIT(21)) >> 21);
578
579 seq_printf(s, "\nhwswitch_return:\t%d\n", hwswitch_ret);
580 seq_printf(s, "hwswitch_state:\t0x%X\n", hwswitch_state);
581 seq_printf(s, "Bit 0 : Wifi controlled by switch: %lu\n",
582 hwswitch_state & BIT(0));
583 seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
584 (hwswitch_state & BIT(1)) >> 1);
585 seq_printf(s, "Bit 2 : WWAN controlled by switch: %lu\n",
586 (hwswitch_state & BIT(2)) >> 2);
587 seq_printf(s, "Bit 3 : UWB controlled by switch: %lu\n",
588 (hwswitch_state & BIT(3)) >> 3);
589 seq_printf(s, "Bit 4 : WiGig controlled by switch: %lu\n",
590 (hwswitch_state & BIT(4)) >> 4);
591 seq_printf(s, "Bit 7 : Wireless switch config locked: %lu\n",
592 (hwswitch_state & BIT(7)) >> 7);
593 seq_printf(s, "Bit 8 : Wifi locator enabled: %lu\n",
594 (hwswitch_state & BIT(8)) >> 8);
595 seq_printf(s, "Bit 15: Wifi locator setting locked: %lu\n",
596 (hwswitch_state & BIT(15)) >> 15);
597
598 return 0;
599 }
600
601 static int dell_debugfs_open(struct inode *inode, struct file *file)
602 {
603 return single_open(file, dell_debugfs_show, inode->i_private);
604 }
605
606 static const struct file_operations dell_debugfs_fops = {
607 .owner = THIS_MODULE,
608 .open = dell_debugfs_open,
609 .read = seq_read,
610 .llseek = seq_lseek,
611 .release = single_release,
612 };
613
614 static void dell_update_rfkill(struct work_struct *ignored)
615 {
616 int hwswitch = 0;
617 int status;
618 int ret;
619
620 get_buffer();
621
622 dell_send_request(buffer, 17, 11);
623 ret = buffer->output[0];
624 status = buffer->output[1];
625
626 if (ret != 0)
627 goto out;
628
629 clear_buffer();
630
631 buffer->input[0] = 0x2;
632 dell_send_request(buffer, 17, 11);
633 ret = buffer->output[0];
634
635 if (ret == 0 && (status & BIT(0)))
636 hwswitch = buffer->output[1];
637
638 if (wifi_rfkill) {
639 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
640 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
641 }
642 if (bluetooth_rfkill) {
643 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status,
644 hwswitch);
645 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
646 }
647 if (wwan_rfkill) {
648 dell_rfkill_update_hw_state(wwan_rfkill, 3, status, hwswitch);
649 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
650 }
651
652 out:
653 release_buffer();
654 }
655 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
656
657 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
658 struct serio *port)
659 {
660 static bool extended;
661
662 if (str & I8042_STR_AUXDATA)
663 return false;
664
665 if (unlikely(data == 0xe0)) {
666 extended = true;
667 return false;
668 } else if (unlikely(extended)) {
669 switch (data) {
670 case 0x8:
671 schedule_delayed_work(&dell_rfkill_work,
672 round_jiffies_relative(HZ / 4));
673 break;
674 }
675 extended = false;
676 }
677
678 return false;
679 }
680
681 static int (*dell_rbtn_notifier_register_func)(struct notifier_block *);
682 static int (*dell_rbtn_notifier_unregister_func)(struct notifier_block *);
683
684 static int dell_laptop_rbtn_notifier_call(struct notifier_block *nb,
685 unsigned long action, void *data)
686 {
687 schedule_delayed_work(&dell_rfkill_work, 0);
688 return NOTIFY_OK;
689 }
690
691 static struct notifier_block dell_laptop_rbtn_notifier = {
692 .notifier_call = dell_laptop_rbtn_notifier_call,
693 };
694
695 static int __init dell_setup_rfkill(void)
696 {
697 int status, ret, whitelisted;
698 const char *product;
699
700 /*
701 * rfkill support causes trouble on various models, mostly Inspirons.
702 * So we whitelist certain series, and don't support rfkill on others.
703 */
704 whitelisted = 0;
705 product = dmi_get_system_info(DMI_PRODUCT_NAME);
706 if (product && (strncmp(product, "Latitude", 8) == 0 ||
707 strncmp(product, "Precision", 9) == 0))
708 whitelisted = 1;
709 if (!force_rfkill && !whitelisted)
710 return 0;
711
712 get_buffer();
713 dell_send_request(buffer, 17, 11);
714 ret = buffer->output[0];
715 status = buffer->output[1];
716 release_buffer();
717
718 /* dell wireless info smbios call is not supported */
719 if (ret != 0)
720 return 0;
721
722 /* rfkill is only tested on laptops with a hwswitch */
723 if (!(status & BIT(0)) && !force_rfkill)
724 return 0;
725
726 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
727 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
728 RFKILL_TYPE_WLAN,
729 &dell_rfkill_ops, (void *) 1);
730 if (!wifi_rfkill) {
731 ret = -ENOMEM;
732 goto err_wifi;
733 }
734 ret = rfkill_register(wifi_rfkill);
735 if (ret)
736 goto err_wifi;
737 }
738
739 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
740 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
741 &platform_device->dev,
742 RFKILL_TYPE_BLUETOOTH,
743 &dell_rfkill_ops, (void *) 2);
744 if (!bluetooth_rfkill) {
745 ret = -ENOMEM;
746 goto err_bluetooth;
747 }
748 ret = rfkill_register(bluetooth_rfkill);
749 if (ret)
750 goto err_bluetooth;
751 }
752
753 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
754 wwan_rfkill = rfkill_alloc("dell-wwan",
755 &platform_device->dev,
756 RFKILL_TYPE_WWAN,
757 &dell_rfkill_ops, (void *) 3);
758 if (!wwan_rfkill) {
759 ret = -ENOMEM;
760 goto err_wwan;
761 }
762 ret = rfkill_register(wwan_rfkill);
763 if (ret)
764 goto err_wwan;
765 }
766
767 /*
768 * Dell Airplane Mode Switch driver (dell-rbtn) supports ACPI devices
769 * which can receive events from HW slider switch.
770 *
771 * Dell SMBIOS on whitelisted models supports controlling radio devices
772 * but does not support receiving HW button switch events. We can use
773 * i8042 filter hook function to receive keyboard data and handle
774 * keycode for HW button.
775 *
776 * So if it is possible we will use Dell Airplane Mode Switch ACPI
777 * driver for receiving HW events and Dell SMBIOS for setting rfkill
778 * states. If ACPI driver or device is not available we will fallback to
779 * i8042 filter hook function.
780 *
781 * To prevent duplicate rfkill devices which control and do same thing,
782 * dell-rbtn driver will automatically remove its own rfkill devices
783 * once function dell_rbtn_notifier_register() is called.
784 */
785
786 dell_rbtn_notifier_register_func =
787 symbol_request(dell_rbtn_notifier_register);
788 if (dell_rbtn_notifier_register_func) {
789 dell_rbtn_notifier_unregister_func =
790 symbol_request(dell_rbtn_notifier_unregister);
791 if (!dell_rbtn_notifier_unregister_func) {
792 symbol_put(dell_rbtn_notifier_register);
793 dell_rbtn_notifier_register_func = NULL;
794 }
795 }
796
797 if (dell_rbtn_notifier_register_func) {
798 ret = dell_rbtn_notifier_register_func(
799 &dell_laptop_rbtn_notifier);
800 symbol_put(dell_rbtn_notifier_register);
801 dell_rbtn_notifier_register_func = NULL;
802 if (ret != 0) {
803 symbol_put(dell_rbtn_notifier_unregister);
804 dell_rbtn_notifier_unregister_func = NULL;
805 }
806 } else {
807 pr_info("Symbols from dell-rbtn acpi driver are not available\n");
808 ret = -ENODEV;
809 }
810
811 if (ret == 0) {
812 pr_info("Using dell-rbtn acpi driver for receiving events\n");
813 } else if (ret != -ENODEV) {
814 pr_warn("Unable to register dell rbtn notifier\n");
815 goto err_filter;
816 } else {
817 ret = i8042_install_filter(dell_laptop_i8042_filter);
818 if (ret) {
819 pr_warn("Unable to install key filter\n");
820 goto err_filter;
821 }
822 pr_info("Using i8042 filter function for receiving events\n");
823 }
824
825 return 0;
826 err_filter:
827 if (wwan_rfkill)
828 rfkill_unregister(wwan_rfkill);
829 err_wwan:
830 rfkill_destroy(wwan_rfkill);
831 if (bluetooth_rfkill)
832 rfkill_unregister(bluetooth_rfkill);
833 err_bluetooth:
834 rfkill_destroy(bluetooth_rfkill);
835 if (wifi_rfkill)
836 rfkill_unregister(wifi_rfkill);
837 err_wifi:
838 rfkill_destroy(wifi_rfkill);
839
840 return ret;
841 }
842
843 static void dell_cleanup_rfkill(void)
844 {
845 if (dell_rbtn_notifier_unregister_func) {
846 dell_rbtn_notifier_unregister_func(&dell_laptop_rbtn_notifier);
847 symbol_put(dell_rbtn_notifier_unregister);
848 dell_rbtn_notifier_unregister_func = NULL;
849 } else {
850 i8042_remove_filter(dell_laptop_i8042_filter);
851 }
852 cancel_delayed_work_sync(&dell_rfkill_work);
853 if (wifi_rfkill) {
854 rfkill_unregister(wifi_rfkill);
855 rfkill_destroy(wifi_rfkill);
856 }
857 if (bluetooth_rfkill) {
858 rfkill_unregister(bluetooth_rfkill);
859 rfkill_destroy(bluetooth_rfkill);
860 }
861 if (wwan_rfkill) {
862 rfkill_unregister(wwan_rfkill);
863 rfkill_destroy(wwan_rfkill);
864 }
865 }
866
867 static int dell_send_intensity(struct backlight_device *bd)
868 {
869 int token;
870 int ret;
871
872 token = find_token_location(BRIGHTNESS_TOKEN);
873 if (token == -1)
874 return -ENODEV;
875
876 get_buffer();
877 buffer->input[0] = token;
878 buffer->input[1] = bd->props.brightness;
879
880 if (power_supply_is_system_supplied() > 0)
881 dell_send_request(buffer, 1, 2);
882 else
883 dell_send_request(buffer, 1, 1);
884
885 ret = dell_smi_error(buffer->output[0]);
886
887 release_buffer();
888 return ret;
889 }
890
891 static int dell_get_intensity(struct backlight_device *bd)
892 {
893 int token;
894 int ret;
895
896 token = find_token_location(BRIGHTNESS_TOKEN);
897 if (token == -1)
898 return -ENODEV;
899
900 get_buffer();
901 buffer->input[0] = token;
902
903 if (power_supply_is_system_supplied() > 0)
904 dell_send_request(buffer, 0, 2);
905 else
906 dell_send_request(buffer, 0, 1);
907
908 if (buffer->output[0])
909 ret = dell_smi_error(buffer->output[0]);
910 else
911 ret = buffer->output[1];
912
913 release_buffer();
914 return ret;
915 }
916
917 static const struct backlight_ops dell_ops = {
918 .get_brightness = dell_get_intensity,
919 .update_status = dell_send_intensity,
920 };
921
922 static void touchpad_led_on(void)
923 {
924 int command = 0x97;
925 char data = 1;
926 i8042_command(&data, command | 1 << 12);
927 }
928
929 static void touchpad_led_off(void)
930 {
931 int command = 0x97;
932 char data = 2;
933 i8042_command(&data, command | 1 << 12);
934 }
935
936 static void touchpad_led_set(struct led_classdev *led_cdev,
937 enum led_brightness value)
938 {
939 if (value > 0)
940 touchpad_led_on();
941 else
942 touchpad_led_off();
943 }
944
945 static struct led_classdev touchpad_led = {
946 .name = "dell-laptop::touchpad",
947 .brightness_set = touchpad_led_set,
948 .flags = LED_CORE_SUSPENDRESUME,
949 };
950
951 static int __init touchpad_led_init(struct device *dev)
952 {
953 return led_classdev_register(dev, &touchpad_led);
954 }
955
956 static void touchpad_led_exit(void)
957 {
958 led_classdev_unregister(&touchpad_led);
959 }
960
961 /*
962 * Derived from information in smbios-keyboard-ctl:
963 *
964 * cbClass 4
965 * cbSelect 11
966 * Keyboard illumination
967 * cbArg1 determines the function to be performed
968 *
969 * cbArg1 0x0 = Get Feature Information
970 * cbRES1 Standard return codes (0, -1, -2)
971 * cbRES2, word0 Bitmap of user-selectable modes
972 * bit 0 Always off (All systems)
973 * bit 1 Always on (Travis ATG, Siberia)
974 * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
975 * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
976 * bit 4 Auto: Input-activity-based On; input-activity based Off
977 * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
978 * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
979 * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
980 * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
981 * bits 9-15 Reserved for future use
982 * cbRES2, byte2 Reserved for future use
983 * cbRES2, byte3 Keyboard illumination type
984 * 0 Reserved
985 * 1 Tasklight
986 * 2 Backlight
987 * 3-255 Reserved for future use
988 * cbRES3, byte0 Supported auto keyboard illumination trigger bitmap.
989 * bit 0 Any keystroke
990 * bit 1 Touchpad activity
991 * bit 2 Pointing stick
992 * bit 3 Any mouse
993 * bits 4-7 Reserved for future use
994 * cbRES3, byte1 Supported timeout unit bitmap
995 * bit 0 Seconds
996 * bit 1 Minutes
997 * bit 2 Hours
998 * bit 3 Days
999 * bits 4-7 Reserved for future use
1000 * cbRES3, byte2 Number of keyboard light brightness levels
1001 * cbRES4, byte0 Maximum acceptable seconds value (0 if seconds not supported).
1002 * cbRES4, byte1 Maximum acceptable minutes value (0 if minutes not supported).
1003 * cbRES4, byte2 Maximum acceptable hours value (0 if hours not supported).
1004 * cbRES4, byte3 Maximum acceptable days value (0 if days not supported)
1005 *
1006 * cbArg1 0x1 = Get Current State
1007 * cbRES1 Standard return codes (0, -1, -2)
1008 * cbRES2, word0 Bitmap of current mode state
1009 * bit 0 Always off (All systems)
1010 * bit 1 Always on (Travis ATG, Siberia)
1011 * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
1012 * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
1013 * bit 4 Auto: Input-activity-based On; input-activity based Off
1014 * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1015 * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1016 * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1017 * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1018 * bits 9-15 Reserved for future use
1019 * Note: Only One bit can be set
1020 * cbRES2, byte2 Currently active auto keyboard illumination triggers.
1021 * bit 0 Any keystroke
1022 * bit 1 Touchpad activity
1023 * bit 2 Pointing stick
1024 * bit 3 Any mouse
1025 * bits 4-7 Reserved for future use
1026 * cbRES2, byte3 Current Timeout
1027 * bits 7:6 Timeout units indicator:
1028 * 00b Seconds
1029 * 01b Minutes
1030 * 10b Hours
1031 * 11b Days
1032 * bits 5:0 Timeout value (0-63) in sec/min/hr/day
1033 * NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
1034 * are set upon return from the [Get feature information] call.
1035 * cbRES3, byte0 Current setting of ALS value that turns the light on or off.
1036 * cbRES3, byte1 Current ALS reading
1037 * cbRES3, byte2 Current keyboard light level.
1038 *
1039 * cbArg1 0x2 = Set New State
1040 * cbRES1 Standard return codes (0, -1, -2)
1041 * cbArg2, word0 Bitmap of current mode state
1042 * bit 0 Always off (All systems)
1043 * bit 1 Always on (Travis ATG, Siberia)
1044 * bit 2 Auto: ALS-based On; ALS-based Off (Travis ATG)
1045 * bit 3 Auto: ALS- and input-activity-based On; input-activity based Off
1046 * bit 4 Auto: Input-activity-based On; input-activity based Off
1047 * bit 5 Auto: Input-activity-based On (illumination level 25%); input-activity based Off
1048 * bit 6 Auto: Input-activity-based On (illumination level 50%); input-activity based Off
1049 * bit 7 Auto: Input-activity-based On (illumination level 75%); input-activity based Off
1050 * bit 8 Auto: Input-activity-based On (illumination level 100%); input-activity based Off
1051 * bits 9-15 Reserved for future use
1052 * Note: Only One bit can be set
1053 * cbArg2, byte2 Desired auto keyboard illumination triggers. Must remain inactive to allow
1054 * keyboard to turn off automatically.
1055 * bit 0 Any keystroke
1056 * bit 1 Touchpad activity
1057 * bit 2 Pointing stick
1058 * bit 3 Any mouse
1059 * bits 4-7 Reserved for future use
1060 * cbArg2, byte3 Desired Timeout
1061 * bits 7:6 Timeout units indicator:
1062 * 00b Seconds
1063 * 01b Minutes
1064 * 10b Hours
1065 * 11b Days
1066 * bits 5:0 Timeout value (0-63) in sec/min/hr/day
1067 * cbArg3, byte0 Desired setting of ALS value that turns the light on or off.
1068 * cbArg3, byte2 Desired keyboard light level.
1069 */
1070
1071
1072 enum kbd_timeout_unit {
1073 KBD_TIMEOUT_SECONDS = 0,
1074 KBD_TIMEOUT_MINUTES,
1075 KBD_TIMEOUT_HOURS,
1076 KBD_TIMEOUT_DAYS,
1077 };
1078
1079 enum kbd_mode_bit {
1080 KBD_MODE_BIT_OFF = 0,
1081 KBD_MODE_BIT_ON,
1082 KBD_MODE_BIT_ALS,
1083 KBD_MODE_BIT_TRIGGER_ALS,
1084 KBD_MODE_BIT_TRIGGER,
1085 KBD_MODE_BIT_TRIGGER_25,
1086 KBD_MODE_BIT_TRIGGER_50,
1087 KBD_MODE_BIT_TRIGGER_75,
1088 KBD_MODE_BIT_TRIGGER_100,
1089 };
1090
1091 #define kbd_is_als_mode_bit(bit) \
1092 ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
1093 #define kbd_is_trigger_mode_bit(bit) \
1094 ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1095 #define kbd_is_level_mode_bit(bit) \
1096 ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
1097
1098 struct kbd_info {
1099 u16 modes;
1100 u8 type;
1101 u8 triggers;
1102 u8 levels;
1103 u8 seconds;
1104 u8 minutes;
1105 u8 hours;
1106 u8 days;
1107 };
1108
1109 struct kbd_state {
1110 u8 mode_bit;
1111 u8 triggers;
1112 u8 timeout_value;
1113 u8 timeout_unit;
1114 u8 als_setting;
1115 u8 als_value;
1116 u8 level;
1117 };
1118
1119 static const int kbd_tokens[] = {
1120 KBD_LED_OFF_TOKEN,
1121 KBD_LED_AUTO_25_TOKEN,
1122 KBD_LED_AUTO_50_TOKEN,
1123 KBD_LED_AUTO_75_TOKEN,
1124 KBD_LED_AUTO_100_TOKEN,
1125 KBD_LED_ON_TOKEN,
1126 };
1127
1128 static u16 kbd_token_bits;
1129
1130 static struct kbd_info kbd_info;
1131 static bool kbd_als_supported;
1132 static bool kbd_triggers_supported;
1133
1134 static u8 kbd_mode_levels[16];
1135 static int kbd_mode_levels_count;
1136
1137 static u8 kbd_previous_level;
1138 static u8 kbd_previous_mode_bit;
1139
1140 static bool kbd_led_present;
1141
1142 /*
1143 * NOTE: there are three ways to set the keyboard backlight level.
1144 * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1145 * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1146 * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1147 *
1148 * There are laptops which support only one of these methods. If we want to
1149 * support as many machines as possible we need to implement all three methods.
1150 * The first two methods use the kbd_state structure. The third uses SMBIOS
1151 * tokens. If kbd_info.levels == 0, the machine does not support setting the
1152 * keyboard backlight level via kbd_state.level.
1153 */
1154
1155 static int kbd_get_info(struct kbd_info *info)
1156 {
1157 u8 units;
1158 int ret;
1159
1160 get_buffer();
1161
1162 buffer->input[0] = 0x0;
1163 dell_send_request(buffer, 4, 11);
1164 ret = buffer->output[0];
1165
1166 if (ret) {
1167 ret = dell_smi_error(ret);
1168 goto out;
1169 }
1170
1171 info->modes = buffer->output[1] & 0xFFFF;
1172 info->type = (buffer->output[1] >> 24) & 0xFF;
1173 info->triggers = buffer->output[2] & 0xFF;
1174 units = (buffer->output[2] >> 8) & 0xFF;
1175 info->levels = (buffer->output[2] >> 16) & 0xFF;
1176
1177 if (units & BIT(0))
1178 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1179 if (units & BIT(1))
1180 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1181 if (units & BIT(2))
1182 info->hours = (buffer->output[3] >> 16) & 0xFF;
1183 if (units & BIT(3))
1184 info->days = (buffer->output[3] >> 24) & 0xFF;
1185
1186 out:
1187 release_buffer();
1188 return ret;
1189 }
1190
1191 static unsigned int kbd_get_max_level(void)
1192 {
1193 if (kbd_info.levels != 0)
1194 return kbd_info.levels;
1195 if (kbd_mode_levels_count > 0)
1196 return kbd_mode_levels_count - 1;
1197 return 0;
1198 }
1199
1200 static int kbd_get_level(struct kbd_state *state)
1201 {
1202 int i;
1203
1204 if (kbd_info.levels != 0)
1205 return state->level;
1206
1207 if (kbd_mode_levels_count > 0) {
1208 for (i = 0; i < kbd_mode_levels_count; ++i)
1209 if (kbd_mode_levels[i] == state->mode_bit)
1210 return i;
1211 return 0;
1212 }
1213
1214 return -EINVAL;
1215 }
1216
1217 static int kbd_set_level(struct kbd_state *state, u8 level)
1218 {
1219 if (kbd_info.levels != 0) {
1220 if (level != 0)
1221 kbd_previous_level = level;
1222 if (state->level == level)
1223 return 0;
1224 state->level = level;
1225 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1226 state->mode_bit = kbd_previous_mode_bit;
1227 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1228 kbd_previous_mode_bit = state->mode_bit;
1229 state->mode_bit = KBD_MODE_BIT_OFF;
1230 }
1231 return 0;
1232 }
1233
1234 if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1235 if (level != 0)
1236 kbd_previous_level = level;
1237 state->mode_bit = kbd_mode_levels[level];
1238 return 0;
1239 }
1240
1241 return -EINVAL;
1242 }
1243
1244 static int kbd_get_state(struct kbd_state *state)
1245 {
1246 int ret;
1247
1248 get_buffer();
1249
1250 buffer->input[0] = 0x1;
1251 dell_send_request(buffer, 4, 11);
1252 ret = buffer->output[0];
1253
1254 if (ret) {
1255 ret = dell_smi_error(ret);
1256 goto out;
1257 }
1258
1259 state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1260 if (state->mode_bit != 0)
1261 state->mode_bit--;
1262
1263 state->triggers = (buffer->output[1] >> 16) & 0xFF;
1264 state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1265 state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1266 state->als_setting = buffer->output[2] & 0xFF;
1267 state->als_value = (buffer->output[2] >> 8) & 0xFF;
1268 state->level = (buffer->output[2] >> 16) & 0xFF;
1269
1270 out:
1271 release_buffer();
1272 return ret;
1273 }
1274
1275 static int kbd_set_state(struct kbd_state *state)
1276 {
1277 int ret;
1278
1279 get_buffer();
1280 buffer->input[0] = 0x2;
1281 buffer->input[1] = BIT(state->mode_bit) & 0xFFFF;
1282 buffer->input[1] |= (state->triggers & 0xFF) << 16;
1283 buffer->input[1] |= (state->timeout_value & 0x3F) << 24;
1284 buffer->input[1] |= (state->timeout_unit & 0x3) << 30;
1285 buffer->input[2] = state->als_setting & 0xFF;
1286 buffer->input[2] |= (state->level & 0xFF) << 16;
1287 dell_send_request(buffer, 4, 11);
1288 ret = buffer->output[0];
1289 release_buffer();
1290
1291 return dell_smi_error(ret);
1292 }
1293
1294 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1295 {
1296 int ret;
1297
1298 ret = kbd_set_state(state);
1299 if (ret == 0)
1300 return 0;
1301
1302 /*
1303 * When setting the new state fails,try to restore the previous one.
1304 * This is needed on some machines where BIOS sets a default state when
1305 * setting a new state fails. This default state could be all off.
1306 */
1307
1308 if (kbd_set_state(old))
1309 pr_err("Setting old previous keyboard state failed\n");
1310
1311 return ret;
1312 }
1313
1314 static int kbd_set_token_bit(u8 bit)
1315 {
1316 int id;
1317 int ret;
1318
1319 if (bit >= ARRAY_SIZE(kbd_tokens))
1320 return -EINVAL;
1321
1322 id = find_token_id(kbd_tokens[bit]);
1323 if (id == -1)
1324 return -EINVAL;
1325
1326 get_buffer();
1327 buffer->input[0] = da_tokens[id].location;
1328 buffer->input[1] = da_tokens[id].value;
1329 dell_send_request(buffer, 1, 0);
1330 ret = buffer->output[0];
1331 release_buffer();
1332
1333 return dell_smi_error(ret);
1334 }
1335
1336 static int kbd_get_token_bit(u8 bit)
1337 {
1338 int id;
1339 int ret;
1340 int val;
1341
1342 if (bit >= ARRAY_SIZE(kbd_tokens))
1343 return -EINVAL;
1344
1345 id = find_token_id(kbd_tokens[bit]);
1346 if (id == -1)
1347 return -EINVAL;
1348
1349 get_buffer();
1350 buffer->input[0] = da_tokens[id].location;
1351 dell_send_request(buffer, 0, 0);
1352 ret = buffer->output[0];
1353 val = buffer->output[1];
1354 release_buffer();
1355
1356 if (ret)
1357 return dell_smi_error(ret);
1358
1359 return (val == da_tokens[id].value);
1360 }
1361
1362 static int kbd_get_first_active_token_bit(void)
1363 {
1364 int i;
1365 int ret;
1366
1367 for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1368 ret = kbd_get_token_bit(i);
1369 if (ret == 1)
1370 return i;
1371 }
1372
1373 return ret;
1374 }
1375
1376 static int kbd_get_valid_token_counts(void)
1377 {
1378 return hweight16(kbd_token_bits);
1379 }
1380
1381 static inline int kbd_init_info(void)
1382 {
1383 struct kbd_state state;
1384 int ret;
1385 int i;
1386
1387 ret = kbd_get_info(&kbd_info);
1388 if (ret)
1389 return ret;
1390
1391 kbd_get_state(&state);
1392
1393 /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1394 if (kbd_info.seconds > 63)
1395 kbd_info.seconds = 63;
1396 if (kbd_info.minutes > 63)
1397 kbd_info.minutes = 63;
1398 if (kbd_info.hours > 63)
1399 kbd_info.hours = 63;
1400 if (kbd_info.days > 63)
1401 kbd_info.days = 63;
1402
1403 /* NOTE: On tested machines ON mode did not work and caused
1404 * problems (turned backlight off) so do not use it
1405 */
1406 kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1407
1408 kbd_previous_level = kbd_get_level(&state);
1409 kbd_previous_mode_bit = state.mode_bit;
1410
1411 if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1412 kbd_previous_level = 1;
1413
1414 if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1415 kbd_previous_mode_bit =
1416 ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1417 if (kbd_previous_mode_bit != 0)
1418 kbd_previous_mode_bit--;
1419 }
1420
1421 if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1422 BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1423 kbd_als_supported = true;
1424
1425 if (kbd_info.modes & (
1426 BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1427 BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1428 BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1429 ))
1430 kbd_triggers_supported = true;
1431
1432 /* kbd_mode_levels[0] is reserved, see below */
1433 for (i = 0; i < 16; ++i)
1434 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1435 kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1436
1437 /*
1438 * Find the first supported mode and assign to kbd_mode_levels[0].
1439 * This should be 0 (off), but we cannot depend on the BIOS to
1440 * support 0.
1441 */
1442 if (kbd_mode_levels_count > 0) {
1443 for (i = 0; i < 16; ++i) {
1444 if (BIT(i) & kbd_info.modes) {
1445 kbd_mode_levels[0] = i;
1446 break;
1447 }
1448 }
1449 kbd_mode_levels_count++;
1450 }
1451
1452 return 0;
1453
1454 }
1455
1456 static inline void kbd_init_tokens(void)
1457 {
1458 int i;
1459
1460 for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1461 if (find_token_id(kbd_tokens[i]) != -1)
1462 kbd_token_bits |= BIT(i);
1463 }
1464
1465 static void kbd_init(void)
1466 {
1467 int ret;
1468
1469 ret = kbd_init_info();
1470 kbd_init_tokens();
1471
1472 if (kbd_token_bits != 0 || ret == 0)
1473 kbd_led_present = true;
1474 }
1475
1476 static ssize_t kbd_led_timeout_store(struct device *dev,
1477 struct device_attribute *attr,
1478 const char *buf, size_t count)
1479 {
1480 struct kbd_state new_state;
1481 struct kbd_state state;
1482 bool convert;
1483 int value;
1484 int ret;
1485 char ch;
1486 u8 unit;
1487 int i;
1488
1489 ret = sscanf(buf, "%d %c", &value, &ch);
1490 if (ret < 1)
1491 return -EINVAL;
1492 else if (ret == 1)
1493 ch = 's';
1494
1495 if (value < 0)
1496 return -EINVAL;
1497
1498 convert = false;
1499
1500 switch (ch) {
1501 case 's':
1502 if (value > kbd_info.seconds)
1503 convert = true;
1504 unit = KBD_TIMEOUT_SECONDS;
1505 break;
1506 case 'm':
1507 if (value > kbd_info.minutes)
1508 convert = true;
1509 unit = KBD_TIMEOUT_MINUTES;
1510 break;
1511 case 'h':
1512 if (value > kbd_info.hours)
1513 convert = true;
1514 unit = KBD_TIMEOUT_HOURS;
1515 break;
1516 case 'd':
1517 if (value > kbd_info.days)
1518 convert = true;
1519 unit = KBD_TIMEOUT_DAYS;
1520 break;
1521 default:
1522 return -EINVAL;
1523 }
1524
1525 if (quirks && quirks->needs_kbd_timeouts)
1526 convert = true;
1527
1528 if (convert) {
1529 /* Convert value from current units to seconds */
1530 switch (unit) {
1531 case KBD_TIMEOUT_DAYS:
1532 value *= 24;
1533 case KBD_TIMEOUT_HOURS:
1534 value *= 60;
1535 case KBD_TIMEOUT_MINUTES:
1536 value *= 60;
1537 unit = KBD_TIMEOUT_SECONDS;
1538 }
1539
1540 if (quirks && quirks->needs_kbd_timeouts) {
1541 for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1542 if (value <= quirks->kbd_timeouts[i]) {
1543 value = quirks->kbd_timeouts[i];
1544 break;
1545 }
1546 }
1547 }
1548
1549 if (value <= kbd_info.seconds && kbd_info.seconds) {
1550 unit = KBD_TIMEOUT_SECONDS;
1551 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1552 value /= 60;
1553 unit = KBD_TIMEOUT_MINUTES;
1554 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1555 value /= (60 * 60);
1556 unit = KBD_TIMEOUT_HOURS;
1557 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1558 value /= (60 * 60 * 24);
1559 unit = KBD_TIMEOUT_DAYS;
1560 } else {
1561 return -EINVAL;
1562 }
1563 }
1564
1565 ret = kbd_get_state(&state);
1566 if (ret)
1567 return ret;
1568
1569 new_state = state;
1570 new_state.timeout_value = value;
1571 new_state.timeout_unit = unit;
1572
1573 ret = kbd_set_state_safe(&new_state, &state);
1574 if (ret)
1575 return ret;
1576
1577 return count;
1578 }
1579
1580 static ssize_t kbd_led_timeout_show(struct device *dev,
1581 struct device_attribute *attr, char *buf)
1582 {
1583 struct kbd_state state;
1584 int ret;
1585 int len;
1586
1587 ret = kbd_get_state(&state);
1588 if (ret)
1589 return ret;
1590
1591 len = sprintf(buf, "%d", state.timeout_value);
1592
1593 switch (state.timeout_unit) {
1594 case KBD_TIMEOUT_SECONDS:
1595 return len + sprintf(buf+len, "s\n");
1596 case KBD_TIMEOUT_MINUTES:
1597 return len + sprintf(buf+len, "m\n");
1598 case KBD_TIMEOUT_HOURS:
1599 return len + sprintf(buf+len, "h\n");
1600 case KBD_TIMEOUT_DAYS:
1601 return len + sprintf(buf+len, "d\n");
1602 default:
1603 return -EINVAL;
1604 }
1605
1606 return len;
1607 }
1608
1609 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1610 kbd_led_timeout_show, kbd_led_timeout_store);
1611
1612 static const char * const kbd_led_triggers[] = {
1613 "keyboard",
1614 "touchpad",
1615 /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1616 "mouse",
1617 };
1618
1619 static ssize_t kbd_led_triggers_store(struct device *dev,
1620 struct device_attribute *attr,
1621 const char *buf, size_t count)
1622 {
1623 struct kbd_state new_state;
1624 struct kbd_state state;
1625 bool triggers_enabled = false;
1626 int trigger_bit = -1;
1627 char trigger[21];
1628 int i, ret;
1629
1630 ret = sscanf(buf, "%20s", trigger);
1631 if (ret != 1)
1632 return -EINVAL;
1633
1634 if (trigger[0] != '+' && trigger[0] != '-')
1635 return -EINVAL;
1636
1637 ret = kbd_get_state(&state);
1638 if (ret)
1639 return ret;
1640
1641 if (kbd_triggers_supported)
1642 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1643
1644 if (kbd_triggers_supported) {
1645 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1646 if (!(kbd_info.triggers & BIT(i)))
1647 continue;
1648 if (!kbd_led_triggers[i])
1649 continue;
1650 if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1651 continue;
1652 if (trigger[0] == '+' &&
1653 triggers_enabled && (state.triggers & BIT(i)))
1654 return count;
1655 if (trigger[0] == '-' &&
1656 (!triggers_enabled || !(state.triggers & BIT(i))))
1657 return count;
1658 trigger_bit = i;
1659 break;
1660 }
1661 }
1662
1663 if (trigger_bit != -1) {
1664 new_state = state;
1665 if (trigger[0] == '+')
1666 new_state.triggers |= BIT(trigger_bit);
1667 else {
1668 new_state.triggers &= ~BIT(trigger_bit);
1669 /* NOTE: trackstick bit (2) must be disabled when
1670 * disabling touchpad bit (1), otherwise touchpad
1671 * bit (1) will not be disabled */
1672 if (trigger_bit == 1)
1673 new_state.triggers &= ~BIT(2);
1674 }
1675 if ((kbd_info.triggers & new_state.triggers) !=
1676 new_state.triggers)
1677 return -EINVAL;
1678 if (new_state.triggers && !triggers_enabled) {
1679 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1680 kbd_set_level(&new_state, kbd_previous_level);
1681 } else if (new_state.triggers == 0) {
1682 kbd_set_level(&new_state, 0);
1683 }
1684 if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1685 return -EINVAL;
1686 ret = kbd_set_state_safe(&new_state, &state);
1687 if (ret)
1688 return ret;
1689 if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1690 kbd_previous_mode_bit = new_state.mode_bit;
1691 return count;
1692 }
1693
1694 return -EINVAL;
1695 }
1696
1697 static ssize_t kbd_led_triggers_show(struct device *dev,
1698 struct device_attribute *attr, char *buf)
1699 {
1700 struct kbd_state state;
1701 bool triggers_enabled;
1702 int level, i, ret;
1703 int len = 0;
1704
1705 ret = kbd_get_state(&state);
1706 if (ret)
1707 return ret;
1708
1709 len = 0;
1710
1711 if (kbd_triggers_supported) {
1712 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1713 level = kbd_get_level(&state);
1714 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1715 if (!(kbd_info.triggers & BIT(i)))
1716 continue;
1717 if (!kbd_led_triggers[i])
1718 continue;
1719 if ((triggers_enabled || level <= 0) &&
1720 (state.triggers & BIT(i)))
1721 buf[len++] = '+';
1722 else
1723 buf[len++] = '-';
1724 len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1725 }
1726 }
1727
1728 if (len)
1729 buf[len - 1] = '\n';
1730
1731 return len;
1732 }
1733
1734 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1735 kbd_led_triggers_show, kbd_led_triggers_store);
1736
1737 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1738 struct device_attribute *attr,
1739 const char *buf, size_t count)
1740 {
1741 struct kbd_state new_state;
1742 struct kbd_state state;
1743 bool triggers_enabled = false;
1744 int enable;
1745 int ret;
1746
1747 ret = kstrtoint(buf, 0, &enable);
1748 if (ret)
1749 return ret;
1750
1751 ret = kbd_get_state(&state);
1752 if (ret)
1753 return ret;
1754
1755 if (enable == kbd_is_als_mode_bit(state.mode_bit))
1756 return count;
1757
1758 new_state = state;
1759
1760 if (kbd_triggers_supported)
1761 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1762
1763 if (enable) {
1764 if (triggers_enabled)
1765 new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1766 else
1767 new_state.mode_bit = KBD_MODE_BIT_ALS;
1768 } else {
1769 if (triggers_enabled) {
1770 new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1771 kbd_set_level(&new_state, kbd_previous_level);
1772 } else {
1773 new_state.mode_bit = KBD_MODE_BIT_ON;
1774 }
1775 }
1776 if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1777 return -EINVAL;
1778
1779 ret = kbd_set_state_safe(&new_state, &state);
1780 if (ret)
1781 return ret;
1782 kbd_previous_mode_bit = new_state.mode_bit;
1783
1784 return count;
1785 }
1786
1787 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1788 struct device_attribute *attr,
1789 char *buf)
1790 {
1791 struct kbd_state state;
1792 bool enabled = false;
1793 int ret;
1794
1795 ret = kbd_get_state(&state);
1796 if (ret)
1797 return ret;
1798 enabled = kbd_is_als_mode_bit(state.mode_bit);
1799
1800 return sprintf(buf, "%d\n", enabled ? 1 : 0);
1801 }
1802
1803 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1804 kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1805
1806 static ssize_t kbd_led_als_setting_store(struct device *dev,
1807 struct device_attribute *attr,
1808 const char *buf, size_t count)
1809 {
1810 struct kbd_state state;
1811 struct kbd_state new_state;
1812 u8 setting;
1813 int ret;
1814
1815 ret = kstrtou8(buf, 10, &setting);
1816 if (ret)
1817 return ret;
1818
1819 ret = kbd_get_state(&state);
1820 if (ret)
1821 return ret;
1822
1823 new_state = state;
1824 new_state.als_setting = setting;
1825
1826 ret = kbd_set_state_safe(&new_state, &state);
1827 if (ret)
1828 return ret;
1829
1830 return count;
1831 }
1832
1833 static ssize_t kbd_led_als_setting_show(struct device *dev,
1834 struct device_attribute *attr,
1835 char *buf)
1836 {
1837 struct kbd_state state;
1838 int ret;
1839
1840 ret = kbd_get_state(&state);
1841 if (ret)
1842 return ret;
1843
1844 return sprintf(buf, "%d\n", state.als_setting);
1845 }
1846
1847 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1848 kbd_led_als_setting_show, kbd_led_als_setting_store);
1849
1850 static struct attribute *kbd_led_attrs[] = {
1851 &dev_attr_stop_timeout.attr,
1852 &dev_attr_start_triggers.attr,
1853 NULL,
1854 };
1855
1856 static const struct attribute_group kbd_led_group = {
1857 .attrs = kbd_led_attrs,
1858 };
1859
1860 static struct attribute *kbd_led_als_attrs[] = {
1861 &dev_attr_als_enabled.attr,
1862 &dev_attr_als_setting.attr,
1863 NULL,
1864 };
1865
1866 static const struct attribute_group kbd_led_als_group = {
1867 .attrs = kbd_led_als_attrs,
1868 };
1869
1870 static const struct attribute_group *kbd_led_groups[] = {
1871 &kbd_led_group,
1872 &kbd_led_als_group,
1873 NULL,
1874 };
1875
1876 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1877 {
1878 int ret;
1879 u16 num;
1880 struct kbd_state state;
1881
1882 if (kbd_get_max_level()) {
1883 ret = kbd_get_state(&state);
1884 if (ret)
1885 return 0;
1886 ret = kbd_get_level(&state);
1887 if (ret < 0)
1888 return 0;
1889 return ret;
1890 }
1891
1892 if (kbd_get_valid_token_counts()) {
1893 ret = kbd_get_first_active_token_bit();
1894 if (ret < 0)
1895 return 0;
1896 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1897 num &= num - 1; /* clear the first bit set */
1898 if (num == 0)
1899 return 0;
1900 return ffs(num) - 1;
1901 }
1902
1903 pr_warn("Keyboard brightness level control not supported\n");
1904 return 0;
1905 }
1906
1907 static void kbd_led_level_set(struct led_classdev *led_cdev,
1908 enum led_brightness value)
1909 {
1910 struct kbd_state state;
1911 struct kbd_state new_state;
1912 u16 num;
1913
1914 if (kbd_get_max_level()) {
1915 if (kbd_get_state(&state))
1916 return;
1917 new_state = state;
1918 if (kbd_set_level(&new_state, value))
1919 return;
1920 kbd_set_state_safe(&new_state, &state);
1921 return;
1922 }
1923
1924 if (kbd_get_valid_token_counts()) {
1925 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1926 num &= num - 1; /* clear the first bit set */
1927 if (num == 0)
1928 return;
1929 kbd_set_token_bit(ffs(num) - 1);
1930 return;
1931 }
1932
1933 pr_warn("Keyboard brightness level control not supported\n");
1934 }
1935
1936 static struct led_classdev kbd_led = {
1937 .name = "dell::kbd_backlight",
1938 .brightness_set = kbd_led_level_set,
1939 .brightness_get = kbd_led_level_get,
1940 .groups = kbd_led_groups,
1941 };
1942
1943 static int __init kbd_led_init(struct device *dev)
1944 {
1945 kbd_init();
1946 if (!kbd_led_present)
1947 return -ENODEV;
1948 if (!kbd_als_supported)
1949 kbd_led_groups[1] = NULL;
1950 kbd_led.max_brightness = kbd_get_max_level();
1951 if (!kbd_led.max_brightness) {
1952 kbd_led.max_brightness = kbd_get_valid_token_counts();
1953 if (kbd_led.max_brightness)
1954 kbd_led.max_brightness--;
1955 }
1956 return led_classdev_register(dev, &kbd_led);
1957 }
1958
1959 static void brightness_set_exit(struct led_classdev *led_cdev,
1960 enum led_brightness value)
1961 {
1962 /* Don't change backlight level on exit */
1963 };
1964
1965 static void kbd_led_exit(void)
1966 {
1967 if (!kbd_led_present)
1968 return;
1969 kbd_led.brightness_set = brightness_set_exit;
1970 led_classdev_unregister(&kbd_led);
1971 }
1972
1973 static int __init dell_init(void)
1974 {
1975 int max_intensity = 0;
1976 int token;
1977 int ret;
1978
1979 if (!dmi_check_system(dell_device_table))
1980 return -ENODEV;
1981
1982 quirks = NULL;
1983 /* find if this machine support other functions */
1984 dmi_check_system(dell_quirks);
1985
1986 ret = platform_driver_register(&platform_driver);
1987 if (ret)
1988 goto fail_platform_driver;
1989 platform_device = platform_device_alloc("dell-laptop", -1);
1990 if (!platform_device) {
1991 ret = -ENOMEM;
1992 goto fail_platform_device1;
1993 }
1994 ret = platform_device_add(platform_device);
1995 if (ret)
1996 goto fail_platform_device2;
1997
1998 ret = dell_setup_rfkill();
1999
2000 if (ret) {
2001 pr_warn("Unable to setup rfkill\n");
2002 goto fail_rfkill;
2003 }
2004
2005 if (quirks && quirks->touchpad_led)
2006 touchpad_led_init(&platform_device->dev);
2007
2008 kbd_led_init(&platform_device->dev);
2009
2010 dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
2011 if (dell_laptop_dir != NULL)
2012 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
2013 &dell_debugfs_fops);
2014
2015 if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
2016 return 0;
2017
2018 token = find_token_location(BRIGHTNESS_TOKEN);
2019 if (token != -1) {
2020 get_buffer();
2021 buffer->input[0] = token;
2022 dell_send_request(buffer, 0, 2);
2023 if (buffer->output[0] == 0)
2024 max_intensity = buffer->output[3];
2025 release_buffer();
2026 }
2027
2028 if (max_intensity) {
2029 struct backlight_properties props;
2030 memset(&props, 0, sizeof(struct backlight_properties));
2031 props.type = BACKLIGHT_PLATFORM;
2032 props.max_brightness = max_intensity;
2033 dell_backlight_device = backlight_device_register("dell_backlight",
2034 &platform_device->dev,
2035 NULL,
2036 &dell_ops,
2037 &props);
2038
2039 if (IS_ERR(dell_backlight_device)) {
2040 ret = PTR_ERR(dell_backlight_device);
2041 dell_backlight_device = NULL;
2042 goto fail_backlight;
2043 }
2044
2045 dell_backlight_device->props.brightness =
2046 dell_get_intensity(dell_backlight_device);
2047 backlight_update_status(dell_backlight_device);
2048 }
2049
2050 return 0;
2051
2052 fail_backlight:
2053 dell_cleanup_rfkill();
2054 fail_rfkill:
2055 platform_device_del(platform_device);
2056 fail_platform_device2:
2057 platform_device_put(platform_device);
2058 fail_platform_device1:
2059 platform_driver_unregister(&platform_driver);
2060 fail_platform_driver:
2061 return ret;
2062 }
2063
2064 static void __exit dell_exit(void)
2065 {
2066 debugfs_remove_recursive(dell_laptop_dir);
2067 if (quirks && quirks->touchpad_led)
2068 touchpad_led_exit();
2069 kbd_led_exit();
2070 backlight_device_unregister(dell_backlight_device);
2071 dell_cleanup_rfkill();
2072 if (platform_device) {
2073 platform_device_unregister(platform_device);
2074 platform_driver_unregister(&platform_driver);
2075 }
2076 }
2077
2078 /* dell-rbtn.c driver export functions which will not work correctly (and could
2079 * cause kernel crash) if they are called before dell-rbtn.c init code. This is
2080 * not problem when dell-rbtn.c is compiled as external module. When both files
2081 * (dell-rbtn.c and dell-laptop.c) are compiled statically into kernel, then we
2082 * need to ensure that dell_init() will be called after initializing dell-rbtn.
2083 * This can be achieved by late_initcall() instead module_init().
2084 */
2085 late_initcall(dell_init);
2086 module_exit(dell_exit);
2087
2088 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2089 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2090 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2091 MODULE_DESCRIPTION("Dell laptop driver");
2092 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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