1 /*
2 * Driver for Dell laptop extras
3 *
4 * Copyright (c) Red Hat <mjg@redhat.com>
5 *
6 * Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
7 * Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/platform_device.h>
20 #include <linux/backlight.h>
21 #include <linux/err.h>
22 #include <linux/dmi.h>
23 #include <linux/io.h>
24 #include <linux/rfkill.h>
25 #include <linux/power_supply.h>
26 #include <linux/acpi.h>
27 #include <linux/mm.h>
28 #include <linux/i8042.h>
29 #include <linux/slab.h>
30 #include <linux/debugfs.h>
31 #include <linux/seq_file.h>
32 #include "../../firmware/dcdbas.h"
33
34 #define BRIGHTNESS_TOKEN 0x7d
35
36 /* This structure will be modified by the firmware when we enter
37 * system management mode, hence the volatiles */
38
39 struct calling_interface_buffer {
40 u16 class;
41 u16 select;
42 volatile u32 input[4];
43 volatile u32 output[4];
44 } __packed;
45
46 struct calling_interface_token {
47 u16 tokenID;
48 u16 location;
49 union {
50 u16 value;
51 u16 stringlength;
52 };
53 };
54
55 struct calling_interface_structure {
56 struct dmi_header header;
57 u16 cmdIOAddress;
58 u8 cmdIOCode;
59 u32 supportedCmds;
60 struct calling_interface_token tokens[];
61 } __packed;
62
63 struct quirk_entry {
64 u8 touchpad_led;
65 };
66
67 static struct quirk_entry *quirks;
68
69 static struct quirk_entry quirk_dell_vostro_v130 = {
70 .touchpad_led = 1,
71 };
72
dmi_matched(const struct dmi_system_id * dmi)73 static int __init dmi_matched(const struct dmi_system_id *dmi)
74 {
75 quirks = dmi->driver_data;
76 return 1;
77 }
78
79 static int da_command_address;
80 static int da_command_code;
81 static int da_num_tokens;
82 static struct calling_interface_token *da_tokens;
83
84 static struct platform_driver platform_driver = {
85 .driver = {
86 .name = "dell-laptop",
87 .owner = THIS_MODULE,
88 }
89 };
90
91 static struct platform_device *platform_device;
92 static struct backlight_device *dell_backlight_device;
93 static struct rfkill *wifi_rfkill;
94 static struct rfkill *bluetooth_rfkill;
95 static struct rfkill *wwan_rfkill;
96 static bool force_rfkill;
97
98 module_param(force_rfkill, bool, 0444);
99 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
100
101 static const struct dmi_system_id dell_device_table[] __initconst = {
102 {
103 .ident = "Dell laptop",
104 .matches = {
105 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
106 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
107 },
108 },
109 {
110 .matches = {
111 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
112 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
113 },
114 },
115 {
116 .ident = "Dell Computer Corporation",
117 .matches = {
118 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
119 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
120 },
121 },
122 { }
123 };
124 MODULE_DEVICE_TABLE(dmi, dell_device_table);
125
126 static const struct dmi_system_id dell_quirks[] __initconst = {
127 {
128 .callback = dmi_matched,
129 .ident = "Dell Vostro V130",
130 .matches = {
131 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
132 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
133 },
134 .driver_data = &quirk_dell_vostro_v130,
135 },
136 {
137 .callback = dmi_matched,
138 .ident = "Dell Vostro V131",
139 .matches = {
140 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
141 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
142 },
143 .driver_data = &quirk_dell_vostro_v130,
144 },
145 {
146 .callback = dmi_matched,
147 .ident = "Dell Vostro 3350",
148 .matches = {
149 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
150 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
151 },
152 .driver_data = &quirk_dell_vostro_v130,
153 },
154 {
155 .callback = dmi_matched,
156 .ident = "Dell Vostro 3555",
157 .matches = {
158 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
159 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
160 },
161 .driver_data = &quirk_dell_vostro_v130,
162 },
163 {
164 .callback = dmi_matched,
165 .ident = "Dell Inspiron N311z",
166 .matches = {
167 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
168 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
169 },
170 .driver_data = &quirk_dell_vostro_v130,
171 },
172 {
173 .callback = dmi_matched,
174 .ident = "Dell Inspiron M5110",
175 .matches = {
176 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
177 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
178 },
179 .driver_data = &quirk_dell_vostro_v130,
180 },
181 {
182 .callback = dmi_matched,
183 .ident = "Dell Vostro 3360",
184 .matches = {
185 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
186 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
187 },
188 .driver_data = &quirk_dell_vostro_v130,
189 },
190 {
191 .callback = dmi_matched,
192 .ident = "Dell Vostro 3460",
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
196 },
197 .driver_data = &quirk_dell_vostro_v130,
198 },
199 {
200 .callback = dmi_matched,
201 .ident = "Dell Vostro 3560",
202 .matches = {
203 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
204 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
205 },
206 .driver_data = &quirk_dell_vostro_v130,
207 },
208 {
209 .callback = dmi_matched,
210 .ident = "Dell Vostro 3450",
211 .matches = {
212 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
214 },
215 .driver_data = &quirk_dell_vostro_v130,
216 },
217 {
218 .callback = dmi_matched,
219 .ident = "Dell Inspiron 5420",
220 .matches = {
221 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
222 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
223 },
224 .driver_data = &quirk_dell_vostro_v130,
225 },
226 {
227 .callback = dmi_matched,
228 .ident = "Dell Inspiron 5520",
229 .matches = {
230 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
231 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
232 },
233 .driver_data = &quirk_dell_vostro_v130,
234 },
235 {
236 .callback = dmi_matched,
237 .ident = "Dell Inspiron 5720",
238 .matches = {
239 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
240 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
241 },
242 .driver_data = &quirk_dell_vostro_v130,
243 },
244 {
245 .callback = dmi_matched,
246 .ident = "Dell Inspiron 7420",
247 .matches = {
248 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
249 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
250 },
251 .driver_data = &quirk_dell_vostro_v130,
252 },
253 {
254 .callback = dmi_matched,
255 .ident = "Dell Inspiron 7520",
256 .matches = {
257 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
258 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
259 },
260 .driver_data = &quirk_dell_vostro_v130,
261 },
262 {
263 .callback = dmi_matched,
264 .ident = "Dell Inspiron 7720",
265 .matches = {
266 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
267 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
268 },
269 .driver_data = &quirk_dell_vostro_v130,
270 },
271 { }
272 };
273
274 static struct calling_interface_buffer *buffer;
275 static DEFINE_MUTEX(buffer_mutex);
276
277 static int hwswitch_state;
278
get_buffer(void)279 static void get_buffer(void)
280 {
281 mutex_lock(&buffer_mutex);
282 memset(buffer, 0, sizeof(struct calling_interface_buffer));
283 }
284
release_buffer(void)285 static void release_buffer(void)
286 {
287 mutex_unlock(&buffer_mutex);
288 }
289
parse_da_table(const struct dmi_header * dm)290 static void __init parse_da_table(const struct dmi_header *dm)
291 {
292 /* Final token is a terminator, so we don't want to copy it */
293 int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
294 struct calling_interface_token *new_da_tokens;
295 struct calling_interface_structure *table =
296 container_of(dm, struct calling_interface_structure, header);
297
298 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
299 6 bytes of entry */
300
301 if (dm->length < 17)
302 return;
303
304 da_command_address = table->cmdIOAddress;
305 da_command_code = table->cmdIOCode;
306
307 new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
308 sizeof(struct calling_interface_token),
309 GFP_KERNEL);
310
311 if (!new_da_tokens)
312 return;
313 da_tokens = new_da_tokens;
314
315 memcpy(da_tokens+da_num_tokens, table->tokens,
316 sizeof(struct calling_interface_token) * tokens);
317
318 da_num_tokens += tokens;
319 }
320
find_tokens(const struct dmi_header * dm,void * dummy)321 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
322 {
323 switch (dm->type) {
324 case 0xd4: /* Indexed IO */
325 case 0xd5: /* Protected Area Type 1 */
326 case 0xd6: /* Protected Area Type 2 */
327 break;
328 case 0xda: /* Calling interface */
329 parse_da_table(dm);
330 break;
331 }
332 }
333
find_token_location(int tokenid)334 static int find_token_location(int tokenid)
335 {
336 int i;
337 for (i = 0; i < da_num_tokens; i++) {
338 if (da_tokens[i].tokenID == tokenid)
339 return da_tokens[i].location;
340 }
341
342 return -1;
343 }
344
345 static struct calling_interface_buffer *
dell_send_request(struct calling_interface_buffer * buffer,int class,int select)346 dell_send_request(struct calling_interface_buffer *buffer, int class,
347 int select)
348 {
349 struct smi_cmd command;
350
351 command.magic = SMI_CMD_MAGIC;
352 command.command_address = da_command_address;
353 command.command_code = da_command_code;
354 command.ebx = virt_to_phys(buffer);
355 command.ecx = 0x42534931;
356
357 buffer->class = class;
358 buffer->select = select;
359
360 dcdbas_smi_request(&command);
361
362 return buffer;
363 }
364
365 /* Derived from information in DellWirelessCtl.cpp:
366 Class 17, select 11 is radio control. It returns an array of 32-bit values.
367
368 Input byte 0 = 0: Wireless information
369
370 result[0]: return code
371 result[1]:
372 Bit 0: Hardware switch supported
373 Bit 1: Wifi locator supported
374 Bit 2: Wifi is supported
375 Bit 3: Bluetooth is supported
376 Bit 4: WWAN is supported
377 Bit 5: Wireless keyboard supported
378 Bits 6-7: Reserved
379 Bit 8: Wifi is installed
380 Bit 9: Bluetooth is installed
381 Bit 10: WWAN is installed
382 Bits 11-15: Reserved
383 Bit 16: Hardware switch is on
384 Bit 17: Wifi is blocked
385 Bit 18: Bluetooth is blocked
386 Bit 19: WWAN is blocked
387 Bits 20-31: Reserved
388 result[2]: NVRAM size in bytes
389 result[3]: NVRAM format version number
390
391 Input byte 0 = 2: Wireless switch configuration
392 result[0]: return code
393 result[1]:
394 Bit 0: Wifi controlled by switch
395 Bit 1: Bluetooth controlled by switch
396 Bit 2: WWAN controlled by switch
397 Bits 3-6: Reserved
398 Bit 7: Wireless switch config locked
399 Bit 8: Wifi locator enabled
400 Bits 9-14: Reserved
401 Bit 15: Wifi locator setting locked
402 Bits 16-31: Reserved
403 */
404
dell_rfkill_set(void * data,bool blocked)405 static int dell_rfkill_set(void *data, bool blocked)
406 {
407 int disable = blocked ? 1 : 0;
408 unsigned long radio = (unsigned long)data;
409 int hwswitch_bit = (unsigned long)data - 1;
410
411 get_buffer();
412 dell_send_request(buffer, 17, 11);
413
414 /* If the hardware switch controls this radio, and the hardware
415 switch is disabled, always disable the radio */
416 if ((hwswitch_state & BIT(hwswitch_bit)) &&
417 !(buffer->output[1] & BIT(16)))
418 disable = 1;
419
420 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
421 dell_send_request(buffer, 17, 11);
422
423 release_buffer();
424 return 0;
425 }
426
427 /* Must be called with the buffer held */
dell_rfkill_update_sw_state(struct rfkill * rfkill,int radio,int status)428 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
429 int status)
430 {
431 if (status & BIT(0)) {
432 /* Has hw-switch, sync sw_state to BIOS */
433 int block = rfkill_blocked(rfkill);
434 buffer->input[0] = (1 | (radio << 8) | (block << 16));
435 dell_send_request(buffer, 17, 11);
436 } else {
437 /* No hw-switch, sync BIOS state to sw_state */
438 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
439 }
440 }
441
dell_rfkill_update_hw_state(struct rfkill * rfkill,int radio,int status)442 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
443 int status)
444 {
445 if (hwswitch_state & (BIT(radio - 1)))
446 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
447 }
448
dell_rfkill_query(struct rfkill * rfkill,void * data)449 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
450 {
451 int status;
452
453 get_buffer();
454 dell_send_request(buffer, 17, 11);
455 status = buffer->output[1];
456
457 dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
458
459 release_buffer();
460 }
461
462 static const struct rfkill_ops dell_rfkill_ops = {
463 .set_block = dell_rfkill_set,
464 .query = dell_rfkill_query,
465 };
466
467 static struct dentry *dell_laptop_dir;
468
dell_debugfs_show(struct seq_file * s,void * data)469 static int dell_debugfs_show(struct seq_file *s, void *data)
470 {
471 int status;
472
473 get_buffer();
474 dell_send_request(buffer, 17, 11);
475 status = buffer->output[1];
476 release_buffer();
477
478 seq_printf(s, "status:\t0x%X\n", status);
479 seq_printf(s, "Bit 0 : Hardware switch supported: %lu\n",
480 status & BIT(0));
481 seq_printf(s, "Bit 1 : Wifi locator supported: %lu\n",
482 (status & BIT(1)) >> 1);
483 seq_printf(s, "Bit 2 : Wifi is supported: %lu\n",
484 (status & BIT(2)) >> 2);
485 seq_printf(s, "Bit 3 : Bluetooth is supported: %lu\n",
486 (status & BIT(3)) >> 3);
487 seq_printf(s, "Bit 4 : WWAN is supported: %lu\n",
488 (status & BIT(4)) >> 4);
489 seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
490 (status & BIT(5)) >> 5);
491 seq_printf(s, "Bit 8 : Wifi is installed: %lu\n",
492 (status & BIT(8)) >> 8);
493 seq_printf(s, "Bit 9 : Bluetooth is installed: %lu\n",
494 (status & BIT(9)) >> 9);
495 seq_printf(s, "Bit 10: WWAN is installed: %lu\n",
496 (status & BIT(10)) >> 10);
497 seq_printf(s, "Bit 16: Hardware switch is on: %lu\n",
498 (status & BIT(16)) >> 16);
499 seq_printf(s, "Bit 17: Wifi is blocked: %lu\n",
500 (status & BIT(17)) >> 17);
501 seq_printf(s, "Bit 18: Bluetooth is blocked: %lu\n",
502 (status & BIT(18)) >> 18);
503 seq_printf(s, "Bit 19: WWAN is blocked: %lu\n",
504 (status & BIT(19)) >> 19);
505
506 seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
507 seq_printf(s, "Bit 0 : Wifi controlled by switch: %lu\n",
508 hwswitch_state & BIT(0));
509 seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
510 (hwswitch_state & BIT(1)) >> 1);
511 seq_printf(s, "Bit 2 : WWAN controlled by switch: %lu\n",
512 (hwswitch_state & BIT(2)) >> 2);
513 seq_printf(s, "Bit 7 : Wireless switch config locked: %lu\n",
514 (hwswitch_state & BIT(7)) >> 7);
515 seq_printf(s, "Bit 8 : Wifi locator enabled: %lu\n",
516 (hwswitch_state & BIT(8)) >> 8);
517 seq_printf(s, "Bit 15: Wifi locator setting locked: %lu\n",
518 (hwswitch_state & BIT(15)) >> 15);
519
520 return 0;
521 }
522
dell_debugfs_open(struct inode * inode,struct file * file)523 static int dell_debugfs_open(struct inode *inode, struct file *file)
524 {
525 return single_open(file, dell_debugfs_show, inode->i_private);
526 }
527
528 static const struct file_operations dell_debugfs_fops = {
529 .owner = THIS_MODULE,
530 .open = dell_debugfs_open,
531 .read = seq_read,
532 .llseek = seq_lseek,
533 .release = single_release,
534 };
535
dell_update_rfkill(struct work_struct * ignored)536 static void dell_update_rfkill(struct work_struct *ignored)
537 {
538 int status;
539
540 get_buffer();
541 dell_send_request(buffer, 17, 11);
542 status = buffer->output[1];
543
544 if (wifi_rfkill) {
545 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
546 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
547 }
548 if (bluetooth_rfkill) {
549 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
550 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
551 }
552 if (wwan_rfkill) {
553 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
554 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
555 }
556
557 release_buffer();
558 }
559 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
560
dell_laptop_i8042_filter(unsigned char data,unsigned char str,struct serio * port)561 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
562 struct serio *port)
563 {
564 static bool extended;
565
566 if (str & 0x20)
567 return false;
568
569 if (unlikely(data == 0xe0)) {
570 extended = true;
571 return false;
572 } else if (unlikely(extended)) {
573 switch (data) {
574 case 0x8:
575 schedule_delayed_work(&dell_rfkill_work,
576 round_jiffies_relative(HZ / 4));
577 break;
578 }
579 extended = false;
580 }
581
582 return false;
583 }
584
dell_setup_rfkill(void)585 static int __init dell_setup_rfkill(void)
586 {
587 int status, ret, whitelisted;
588 const char *product;
589
590 /*
591 * rfkill support causes trouble on various models, mostly Inspirons.
592 * So we whitelist certain series, and don't support rfkill on others.
593 */
594 whitelisted = 0;
595 product = dmi_get_system_info(DMI_PRODUCT_NAME);
596 if (product && (strncmp(product, "Latitude", 8) == 0 ||
597 strncmp(product, "Precision", 9) == 0))
598 whitelisted = 1;
599 if (!force_rfkill && !whitelisted)
600 return 0;
601
602 get_buffer();
603 dell_send_request(buffer, 17, 11);
604 status = buffer->output[1];
605 buffer->input[0] = 0x2;
606 dell_send_request(buffer, 17, 11);
607 hwswitch_state = buffer->output[1];
608 release_buffer();
609
610 if (!(status & BIT(0))) {
611 if (force_rfkill) {
612 /* No hwsitch, clear all hw-controlled bits */
613 hwswitch_state &= ~7;
614 } else {
615 /* rfkill is only tested on laptops with a hwswitch */
616 return 0;
617 }
618 }
619
620 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
621 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
622 RFKILL_TYPE_WLAN,
623 &dell_rfkill_ops, (void *) 1);
624 if (!wifi_rfkill) {
625 ret = -ENOMEM;
626 goto err_wifi;
627 }
628 ret = rfkill_register(wifi_rfkill);
629 if (ret)
630 goto err_wifi;
631 }
632
633 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
634 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
635 &platform_device->dev,
636 RFKILL_TYPE_BLUETOOTH,
637 &dell_rfkill_ops, (void *) 2);
638 if (!bluetooth_rfkill) {
639 ret = -ENOMEM;
640 goto err_bluetooth;
641 }
642 ret = rfkill_register(bluetooth_rfkill);
643 if (ret)
644 goto err_bluetooth;
645 }
646
647 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
648 wwan_rfkill = rfkill_alloc("dell-wwan",
649 &platform_device->dev,
650 RFKILL_TYPE_WWAN,
651 &dell_rfkill_ops, (void *) 3);
652 if (!wwan_rfkill) {
653 ret = -ENOMEM;
654 goto err_wwan;
655 }
656 ret = rfkill_register(wwan_rfkill);
657 if (ret)
658 goto err_wwan;
659 }
660
661 ret = i8042_install_filter(dell_laptop_i8042_filter);
662 if (ret) {
663 pr_warn("Unable to install key filter\n");
664 goto err_filter;
665 }
666
667 return 0;
668 err_filter:
669 if (wwan_rfkill)
670 rfkill_unregister(wwan_rfkill);
671 err_wwan:
672 rfkill_destroy(wwan_rfkill);
673 if (bluetooth_rfkill)
674 rfkill_unregister(bluetooth_rfkill);
675 err_bluetooth:
676 rfkill_destroy(bluetooth_rfkill);
677 if (wifi_rfkill)
678 rfkill_unregister(wifi_rfkill);
679 err_wifi:
680 rfkill_destroy(wifi_rfkill);
681
682 return ret;
683 }
684
dell_cleanup_rfkill(void)685 static void dell_cleanup_rfkill(void)
686 {
687 if (wifi_rfkill) {
688 rfkill_unregister(wifi_rfkill);
689 rfkill_destroy(wifi_rfkill);
690 }
691 if (bluetooth_rfkill) {
692 rfkill_unregister(bluetooth_rfkill);
693 rfkill_destroy(bluetooth_rfkill);
694 }
695 if (wwan_rfkill) {
696 rfkill_unregister(wwan_rfkill);
697 rfkill_destroy(wwan_rfkill);
698 }
699 }
700
dell_send_intensity(struct backlight_device * bd)701 static int dell_send_intensity(struct backlight_device *bd)
702 {
703 int ret = 0;
704
705 get_buffer();
706 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
707 buffer->input[1] = bd->props.brightness;
708
709 if (buffer->input[0] == -1) {
710 ret = -ENODEV;
711 goto out;
712 }
713
714 if (power_supply_is_system_supplied() > 0)
715 dell_send_request(buffer, 1, 2);
716 else
717 dell_send_request(buffer, 1, 1);
718
719 out:
720 release_buffer();
721 return ret;
722 }
723
dell_get_intensity(struct backlight_device * bd)724 static int dell_get_intensity(struct backlight_device *bd)
725 {
726 int ret = 0;
727
728 get_buffer();
729 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
730
731 if (buffer->input[0] == -1) {
732 ret = -ENODEV;
733 goto out;
734 }
735
736 if (power_supply_is_system_supplied() > 0)
737 dell_send_request(buffer, 0, 2);
738 else
739 dell_send_request(buffer, 0, 1);
740
741 ret = buffer->output[1];
742
743 out:
744 release_buffer();
745 return ret;
746 }
747
748 static const struct backlight_ops dell_ops = {
749 .get_brightness = dell_get_intensity,
750 .update_status = dell_send_intensity,
751 };
752
touchpad_led_on(void)753 static void touchpad_led_on(void)
754 {
755 int command = 0x97;
756 char data = 1;
757 i8042_command(&data, command | 1 << 12);
758 }
759
touchpad_led_off(void)760 static void touchpad_led_off(void)
761 {
762 int command = 0x97;
763 char data = 2;
764 i8042_command(&data, command | 1 << 12);
765 }
766
touchpad_led_set(struct led_classdev * led_cdev,enum led_brightness value)767 static void touchpad_led_set(struct led_classdev *led_cdev,
768 enum led_brightness value)
769 {
770 if (value > 0)
771 touchpad_led_on();
772 else
773 touchpad_led_off();
774 }
775
776 static struct led_classdev touchpad_led = {
777 .name = "dell-laptop::touchpad",
778 .brightness_set = touchpad_led_set,
779 .flags = LED_CORE_SUSPENDRESUME,
780 };
781
touchpad_led_init(struct device * dev)782 static int __init touchpad_led_init(struct device *dev)
783 {
784 return led_classdev_register(dev, &touchpad_led);
785 }
786
touchpad_led_exit(void)787 static void touchpad_led_exit(void)
788 {
789 led_classdev_unregister(&touchpad_led);
790 }
791
dell_init(void)792 static int __init dell_init(void)
793 {
794 int max_intensity = 0;
795 int ret;
796
797 if (!dmi_check_system(dell_device_table))
798 return -ENODEV;
799
800 quirks = NULL;
801 /* find if this machine support other functions */
802 dmi_check_system(dell_quirks);
803
804 dmi_walk(find_tokens, NULL);
805
806 if (!da_tokens) {
807 pr_info("Unable to find dmi tokens\n");
808 return -ENODEV;
809 }
810
811 ret = platform_driver_register(&platform_driver);
812 if (ret)
813 goto fail_platform_driver;
814 platform_device = platform_device_alloc("dell-laptop", -1);
815 if (!platform_device) {
816 ret = -ENOMEM;
817 goto fail_platform_device1;
818 }
819 ret = platform_device_add(platform_device);
820 if (ret)
821 goto fail_platform_device2;
822
823 /*
824 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
825 * is passed to SMI handler.
826 */
827 buffer = (void *)__get_free_page(GFP_KERNEL | GFP_DMA32);
828 if (!buffer) {
829 ret = -ENOMEM;
830 goto fail_buffer;
831 }
832
833 ret = dell_setup_rfkill();
834
835 if (ret) {
836 pr_warn("Unable to setup rfkill\n");
837 goto fail_rfkill;
838 }
839
840 if (quirks && quirks->touchpad_led)
841 touchpad_led_init(&platform_device->dev);
842
843 dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
844 if (dell_laptop_dir != NULL)
845 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
846 &dell_debugfs_fops);
847
848 #ifdef CONFIG_ACPI
849 /* In the event of an ACPI backlight being available, don't
850 * register the platform controller.
851 */
852 if (acpi_video_backlight_support())
853 return 0;
854 #endif
855
856 get_buffer();
857 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
858 if (buffer->input[0] != -1) {
859 dell_send_request(buffer, 0, 2);
860 max_intensity = buffer->output[3];
861 }
862 release_buffer();
863
864 if (max_intensity) {
865 struct backlight_properties props;
866 memset(&props, 0, sizeof(struct backlight_properties));
867 props.type = BACKLIGHT_PLATFORM;
868 props.max_brightness = max_intensity;
869 dell_backlight_device = backlight_device_register("dell_backlight",
870 &platform_device->dev,
871 NULL,
872 &dell_ops,
873 &props);
874
875 if (IS_ERR(dell_backlight_device)) {
876 ret = PTR_ERR(dell_backlight_device);
877 dell_backlight_device = NULL;
878 goto fail_backlight;
879 }
880
881 dell_backlight_device->props.brightness =
882 dell_get_intensity(dell_backlight_device);
883 backlight_update_status(dell_backlight_device);
884 }
885
886 return 0;
887
888 fail_backlight:
889 i8042_remove_filter(dell_laptop_i8042_filter);
890 cancel_delayed_work_sync(&dell_rfkill_work);
891 dell_cleanup_rfkill();
892 fail_rfkill:
893 free_page((unsigned long)buffer);
894 fail_buffer:
895 platform_device_del(platform_device);
896 fail_platform_device2:
897 platform_device_put(platform_device);
898 fail_platform_device1:
899 platform_driver_unregister(&platform_driver);
900 fail_platform_driver:
901 kfree(da_tokens);
902 return ret;
903 }
904
dell_exit(void)905 static void __exit dell_exit(void)
906 {
907 debugfs_remove_recursive(dell_laptop_dir);
908 if (quirks && quirks->touchpad_led)
909 touchpad_led_exit();
910 i8042_remove_filter(dell_laptop_i8042_filter);
911 cancel_delayed_work_sync(&dell_rfkill_work);
912 backlight_device_unregister(dell_backlight_device);
913 dell_cleanup_rfkill();
914 if (platform_device) {
915 platform_device_unregister(platform_device);
916 platform_driver_unregister(&platform_driver);
917 }
918 kfree(da_tokens);
919 free_page((unsigned long)buffer);
920 }
921
922 module_init(dell_init);
923 module_exit(dell_exit);
924
925 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
926 MODULE_DESCRIPTION("Dell laptop driver");
927 MODULE_LICENSE("GPL");
928