Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/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/slab.h>
 32 #include <linux/debugfs.h>
 33 #include <linux/seq_file.h>
 34 #include "../../firmware/dcdbas.h"
 35 
 36 #define BRIGHTNESS_TOKEN 0x7d
 37 #define KBD_LED_OFF_TOKEN 0x01E1
 38 #define KBD_LED_ON_TOKEN 0x01E2
 39 #define KBD_LED_AUTO_TOKEN 0x01E3
 40 #define KBD_LED_AUTO_25_TOKEN 0x02EA
 41 #define KBD_LED_AUTO_50_TOKEN 0x02EB
 42 #define KBD_LED_AUTO_75_TOKEN 0x02EC
 43 #define KBD_LED_AUTO_100_TOKEN 0x02F6
 44 
 45 /* This structure will be modified by the firmware when we enter
 46  * system management mode, hence the volatiles */
 47 
 48 struct calling_interface_buffer {
 49         u16 class;
 50         u16 select;
 51         volatile u32 input[4];
 52         volatile u32 output[4];
 53 } __packed;
 54 
 55 struct calling_interface_token {
 56         u16 tokenID;
 57         u16 location;
 58         union {
 59                 u16 value;
 60                 u16 stringlength;
 61         };
 62 };
 63 
 64 struct calling_interface_structure {
 65         struct dmi_header header;
 66         u16 cmdIOAddress;
 67         u8 cmdIOCode;
 68         u32 supportedCmds;
 69         struct calling_interface_token tokens[];
 70 } __packed;
 71 
 72 struct quirk_entry {
 73         u8 touchpad_led;
 74 
 75         int needs_kbd_timeouts;
 76         /*
 77          * Ordered list of timeouts expressed in seconds.
 78          * The list must end with -1
 79          */
 80         int kbd_timeouts[];
 81 };
 82 
 83 static struct quirk_entry *quirks;
 84 
 85 static struct quirk_entry quirk_dell_vostro_v130 = {
 86         .touchpad_led = 1,
 87 };
 88 
 89 static int __init dmi_matched(const struct dmi_system_id *dmi)
 90 {
 91         quirks = dmi->driver_data;
 92         return 1;
 93 }
 94 
 95 /*
 96  * These values come from Windows utility provided by Dell. If any other value
 97  * is used then BIOS silently set timeout to 0 without any error message.
 98  */
 99 static struct quirk_entry quirk_dell_xps13_9333 = {
100         .needs_kbd_timeouts = 1,
101         .kbd_timeouts = { 0, 5, 15, 60, 5 * 60, 15 * 60, -1 },
102 };
103 
104 static int da_command_address;
105 static int da_command_code;
106 static int da_num_tokens;
107 static struct calling_interface_token *da_tokens;
108 
109 static struct platform_driver platform_driver = {
110         .driver = {
111                 .name = "dell-laptop",
112         }
113 };
114 
115 static struct platform_device *platform_device;
116 static struct backlight_device *dell_backlight_device;
117 static struct rfkill *wifi_rfkill;
118 static struct rfkill *bluetooth_rfkill;
119 static struct rfkill *wwan_rfkill;
120 static bool force_rfkill;
121 
122 module_param(force_rfkill, bool, 0444);
123 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
124 
125 static const struct dmi_system_id dell_device_table[] __initconst = {
126         {
127                 .ident = "Dell laptop",
128                 .matches = {
129                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
130                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
131                 },
132         },
133         {
134                 .matches = {
135                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
136                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
137                 },
138         },
139         {
140                 .ident = "Dell Computer Corporation",
141                 .matches = {
142                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
143                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
144                 },
145         },
146         { }
147 };
148 MODULE_DEVICE_TABLE(dmi, dell_device_table);
149 
150 static const struct dmi_system_id dell_quirks[] __initconst = {
151         {
152                 .callback = dmi_matched,
153                 .ident = "Dell Vostro V130",
154                 .matches = {
155                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
156                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
157                 },
158                 .driver_data = &quirk_dell_vostro_v130,
159         },
160         {
161                 .callback = dmi_matched,
162                 .ident = "Dell Vostro V131",
163                 .matches = {
164                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
165                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
166                 },
167                 .driver_data = &quirk_dell_vostro_v130,
168         },
169         {
170                 .callback = dmi_matched,
171                 .ident = "Dell Vostro 3350",
172                 .matches = {
173                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
174                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
175                 },
176                 .driver_data = &quirk_dell_vostro_v130,
177         },
178         {
179                 .callback = dmi_matched,
180                 .ident = "Dell Vostro 3555",
181                 .matches = {
182                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
183                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
184                 },
185                 .driver_data = &quirk_dell_vostro_v130,
186         },
187         {
188                 .callback = dmi_matched,
189                 .ident = "Dell Inspiron N311z",
190                 .matches = {
191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
192                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
193                 },
194                 .driver_data = &quirk_dell_vostro_v130,
195         },
196         {
197                 .callback = dmi_matched,
198                 .ident = "Dell Inspiron M5110",
199                 .matches = {
200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
201                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
202                 },
203                 .driver_data = &quirk_dell_vostro_v130,
204         },
205         {
206                 .callback = dmi_matched,
207                 .ident = "Dell Vostro 3360",
208                 .matches = {
209                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
210                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
211                 },
212                 .driver_data = &quirk_dell_vostro_v130,
213         },
214         {
215                 .callback = dmi_matched,
216                 .ident = "Dell Vostro 3460",
217                 .matches = {
218                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
219                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
220                 },
221                 .driver_data = &quirk_dell_vostro_v130,
222         },
223         {
224                 .callback = dmi_matched,
225                 .ident = "Dell Vostro 3560",
226                 .matches = {
227                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
228                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
229                 },
230                 .driver_data = &quirk_dell_vostro_v130,
231         },
232         {
233                 .callback = dmi_matched,
234                 .ident = "Dell Vostro 3450",
235                 .matches = {
236                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
238                 },
239                 .driver_data = &quirk_dell_vostro_v130,
240         },
241         {
242                 .callback = dmi_matched,
243                 .ident = "Dell Inspiron 5420",
244                 .matches = {
245                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
246                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
247                 },
248                 .driver_data = &quirk_dell_vostro_v130,
249         },
250         {
251                 .callback = dmi_matched,
252                 .ident = "Dell Inspiron 5520",
253                 .matches = {
254                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
255                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
256                 },
257                 .driver_data = &quirk_dell_vostro_v130,
258         },
259         {
260                 .callback = dmi_matched,
261                 .ident = "Dell Inspiron 5720",
262                 .matches = {
263                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
264                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
265                 },
266                 .driver_data = &quirk_dell_vostro_v130,
267         },
268         {
269                 .callback = dmi_matched,
270                 .ident = "Dell Inspiron 7420",
271                 .matches = {
272                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
273                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
274                 },
275                 .driver_data = &quirk_dell_vostro_v130,
276         },
277         {
278                 .callback = dmi_matched,
279                 .ident = "Dell Inspiron 7520",
280                 .matches = {
281                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
282                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
283                 },
284                 .driver_data = &quirk_dell_vostro_v130,
285         },
286         {
287                 .callback = dmi_matched,
288                 .ident = "Dell Inspiron 7720",
289                 .matches = {
290                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
291                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
292                 },
293                 .driver_data = &quirk_dell_vostro_v130,
294         },
295         {
296                 .callback = dmi_matched,
297                 .ident = "Dell XPS13 9333",
298                 .matches = {
299                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
300                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
301                 },
302                 .driver_data = &quirk_dell_xps13_9333,
303         },
304         { }
305 };
306 
307 static struct calling_interface_buffer *buffer;
308 static struct page *bufferpage;
309 static DEFINE_MUTEX(buffer_mutex);
310 
311 static int hwswitch_state;
312 
313 static void get_buffer(void)
314 {
315         mutex_lock(&buffer_mutex);
316         memset(buffer, 0, sizeof(struct calling_interface_buffer));
317 }
318 
319 static void release_buffer(void)
320 {
321         mutex_unlock(&buffer_mutex);
322 }
323 
324 static void __init parse_da_table(const struct dmi_header *dm)
325 {
326         /* Final token is a terminator, so we don't want to copy it */
327         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
328         struct calling_interface_token *new_da_tokens;
329         struct calling_interface_structure *table =
330                 container_of(dm, struct calling_interface_structure, header);
331 
332         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
333            6 bytes of entry */
334 
335         if (dm->length < 17)
336                 return;
337 
338         da_command_address = table->cmdIOAddress;
339         da_command_code = table->cmdIOCode;
340 
341         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
342                                  sizeof(struct calling_interface_token),
343                                  GFP_KERNEL);
344 
345         if (!new_da_tokens)
346                 return;
347         da_tokens = new_da_tokens;
348 
349         memcpy(da_tokens+da_num_tokens, table->tokens,
350                sizeof(struct calling_interface_token) * tokens);
351 
352         da_num_tokens += tokens;
353 }
354 
355 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
356 {
357         switch (dm->type) {
358         case 0xd4: /* Indexed IO */
359         case 0xd5: /* Protected Area Type 1 */
360         case 0xd6: /* Protected Area Type 2 */
361                 break;
362         case 0xda: /* Calling interface */
363                 parse_da_table(dm);
364                 break;
365         }
366 }
367 
368 static int find_token_id(int tokenid)
369 {
370         int i;
371 
372         for (i = 0; i < da_num_tokens; i++) {
373                 if (da_tokens[i].tokenID == tokenid)
374                         return i;
375         }
376 
377         return -1;
378 }
379 
380 static int find_token_location(int tokenid)
381 {
382         int id;
383 
384         id = find_token_id(tokenid);
385         if (id == -1)
386                 return -1;
387 
388         return da_tokens[id].location;
389 }
390 
391 static struct calling_interface_buffer *
392 dell_send_request(struct calling_interface_buffer *buffer, int class,
393                   int select)
394 {
395         struct smi_cmd command;
396 
397         command.magic = SMI_CMD_MAGIC;
398         command.command_address = da_command_address;
399         command.command_code = da_command_code;
400         command.ebx = virt_to_phys(buffer);
401         command.ecx = 0x42534931;
402 
403         buffer->class = class;
404         buffer->select = select;
405 
406         dcdbas_smi_request(&command);
407 
408         return buffer;
409 }
410 
411 static inline int dell_smi_error(int value)
412 {
413         switch (value) {
414         case 0: /* Completed successfully */
415                 return 0;
416         case -1: /* Completed with error */
417                 return -EIO;
418         case -2: /* Function not supported */
419                 return -ENXIO;
420         default: /* Unknown error */
421                 return -EINVAL;
422         }
423 }
424 
425 /* Derived from information in DellWirelessCtl.cpp:
426    Class 17, select 11 is radio control. It returns an array of 32-bit values.
427 
428    Input byte 0 = 0: Wireless information
429 
430    result[0]: return code
431    result[1]:
432      Bit 0:      Hardware switch supported
433      Bit 1:      Wifi locator supported
434      Bit 2:      Wifi is supported
435      Bit 3:      Bluetooth is supported
436      Bit 4:      WWAN is supported
437      Bit 5:      Wireless keyboard supported
438      Bits 6-7:   Reserved
439      Bit 8:      Wifi is installed
440      Bit 9:      Bluetooth is installed
441      Bit 10:     WWAN is installed
442      Bits 11-15: Reserved
443      Bit 16:     Hardware switch is on
444      Bit 17:     Wifi is blocked
445      Bit 18:     Bluetooth is blocked
446      Bit 19:     WWAN is blocked
447      Bits 20-31: Reserved
448    result[2]: NVRAM size in bytes
449    result[3]: NVRAM format version number
450 
451    Input byte 0 = 2: Wireless switch configuration
452    result[0]: return code
453    result[1]:
454      Bit 0:      Wifi controlled by switch
455      Bit 1:      Bluetooth controlled by switch
456      Bit 2:      WWAN controlled by switch
457      Bits 3-6:   Reserved
458      Bit 7:      Wireless switch config locked
459      Bit 8:      Wifi locator enabled
460      Bits 9-14:  Reserved
461      Bit 15:     Wifi locator setting locked
462      Bits 16-31: Reserved
463 */
464 
465 static int dell_rfkill_set(void *data, bool blocked)
466 {
467         int disable = blocked ? 1 : 0;
468         unsigned long radio = (unsigned long)data;
469         int hwswitch_bit = (unsigned long)data - 1;
470 
471         get_buffer();
472         dell_send_request(buffer, 17, 11);
473 
474         /* If the hardware switch controls this radio, and the hardware
475            switch is disabled, always disable the radio */
476         if ((hwswitch_state & BIT(hwswitch_bit)) &&
477             !(buffer->output[1] & BIT(16)))
478                 disable = 1;
479 
480         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
481         dell_send_request(buffer, 17, 11);
482 
483         release_buffer();
484         return 0;
485 }
486 
487 /* Must be called with the buffer held */
488 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
489                                         int status)
490 {
491         if (status & BIT(0)) {
492                 /* Has hw-switch, sync sw_state to BIOS */
493                 int block = rfkill_blocked(rfkill);
494                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
495                 dell_send_request(buffer, 17, 11);
496         } else {
497                 /* No hw-switch, sync BIOS state to sw_state */
498                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
499         }
500 }
501 
502 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
503                                         int status)
504 {
505         if (hwswitch_state & (BIT(radio - 1)))
506                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
507 }
508 
509 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
510 {
511         int status;
512 
513         get_buffer();
514         dell_send_request(buffer, 17, 11);
515         status = buffer->output[1];
516 
517         dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
518 
519         release_buffer();
520 }
521 
522 static const struct rfkill_ops dell_rfkill_ops = {
523         .set_block = dell_rfkill_set,
524         .query = dell_rfkill_query,
525 };
526 
527 static struct dentry *dell_laptop_dir;
528 
529 static int dell_debugfs_show(struct seq_file *s, void *data)
530 {
531         int status;
532 
533         get_buffer();
534         dell_send_request(buffer, 17, 11);
535         status = buffer->output[1];
536         release_buffer();
537 
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 8 : Wifi is installed:           %lu\n",
552                   (status & BIT(8)) >> 8);
553         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
554                   (status & BIT(9)) >> 9);
555         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
556                   (status & BIT(10)) >> 10);
557         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
558                   (status & BIT(16)) >> 16);
559         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
560                   (status & BIT(17)) >> 17);
561         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
562                   (status & BIT(18)) >> 18);
563         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
564                   (status & BIT(19)) >> 19);
565 
566         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
567         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
568                    hwswitch_state & BIT(0));
569         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
570                    (hwswitch_state & BIT(1)) >> 1);
571         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
572                    (hwswitch_state & BIT(2)) >> 2);
573         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
574                    (hwswitch_state & BIT(7)) >> 7);
575         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
576                    (hwswitch_state & BIT(8)) >> 8);
577         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
578                    (hwswitch_state & BIT(15)) >> 15);
579 
580         return 0;
581 }
582 
583 static int dell_debugfs_open(struct inode *inode, struct file *file)
584 {
585         return single_open(file, dell_debugfs_show, inode->i_private);
586 }
587 
588 static const struct file_operations dell_debugfs_fops = {
589         .owner = THIS_MODULE,
590         .open = dell_debugfs_open,
591         .read = seq_read,
592         .llseek = seq_lseek,
593         .release = single_release,
594 };
595 
596 static void dell_update_rfkill(struct work_struct *ignored)
597 {
598         int status;
599 
600         get_buffer();
601         dell_send_request(buffer, 17, 11);
602         status = buffer->output[1];
603 
604         if (wifi_rfkill) {
605                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
606                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
607         }
608         if (bluetooth_rfkill) {
609                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
610                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
611         }
612         if (wwan_rfkill) {
613                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
614                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
615         }
616 
617         release_buffer();
618 }
619 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
620 
621 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
622                               struct serio *port)
623 {
624         static bool extended;
625 
626         if (str & I8042_STR_AUXDATA)
627                 return false;
628 
629         if (unlikely(data == 0xe0)) {
630                 extended = true;
631                 return false;
632         } else if (unlikely(extended)) {
633                 switch (data) {
634                 case 0x8:
635                         schedule_delayed_work(&dell_rfkill_work,
636                                               round_jiffies_relative(HZ / 4));
637                         break;
638                 }
639                 extended = false;
640         }
641 
642         return false;
643 }
644 
645 static int __init dell_setup_rfkill(void)
646 {
647         int status, ret, whitelisted;
648         const char *product;
649 
650         /*
651          * rfkill support causes trouble on various models, mostly Inspirons.
652          * So we whitelist certain series, and don't support rfkill on others.
653          */
654         whitelisted = 0;
655         product = dmi_get_system_info(DMI_PRODUCT_NAME);
656         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
657                          strncmp(product, "Precision", 9) == 0))
658                 whitelisted = 1;
659         if (!force_rfkill && !whitelisted)
660                 return 0;
661 
662         get_buffer();
663         dell_send_request(buffer, 17, 11);
664         status = buffer->output[1];
665         buffer->input[0] = 0x2;
666         dell_send_request(buffer, 17, 11);
667         hwswitch_state = buffer->output[1];
668         release_buffer();
669 
670         if (!(status & BIT(0))) {
671                 if (force_rfkill) {
672                         /* No hwsitch, clear all hw-controlled bits */
673                         hwswitch_state &= ~7;
674                 } else {
675                         /* rfkill is only tested on laptops with a hwswitch */
676                         return 0;
677                 }
678         }
679 
680         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
681                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
682                                            RFKILL_TYPE_WLAN,
683                                            &dell_rfkill_ops, (void *) 1);
684                 if (!wifi_rfkill) {
685                         ret = -ENOMEM;
686                         goto err_wifi;
687                 }
688                 ret = rfkill_register(wifi_rfkill);
689                 if (ret)
690                         goto err_wifi;
691         }
692 
693         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
694                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
695                                                 &platform_device->dev,
696                                                 RFKILL_TYPE_BLUETOOTH,
697                                                 &dell_rfkill_ops, (void *) 2);
698                 if (!bluetooth_rfkill) {
699                         ret = -ENOMEM;
700                         goto err_bluetooth;
701                 }
702                 ret = rfkill_register(bluetooth_rfkill);
703                 if (ret)
704                         goto err_bluetooth;
705         }
706 
707         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
708                 wwan_rfkill = rfkill_alloc("dell-wwan",
709                                            &platform_device->dev,
710                                            RFKILL_TYPE_WWAN,
711                                            &dell_rfkill_ops, (void *) 3);
712                 if (!wwan_rfkill) {
713                         ret = -ENOMEM;
714                         goto err_wwan;
715                 }
716                 ret = rfkill_register(wwan_rfkill);
717                 if (ret)
718                         goto err_wwan;
719         }
720 
721         ret = i8042_install_filter(dell_laptop_i8042_filter);
722         if (ret) {
723                 pr_warn("Unable to install key filter\n");
724                 goto err_filter;
725         }
726 
727         return 0;
728 err_filter:
729         if (wwan_rfkill)
730                 rfkill_unregister(wwan_rfkill);
731 err_wwan:
732         rfkill_destroy(wwan_rfkill);
733         if (bluetooth_rfkill)
734                 rfkill_unregister(bluetooth_rfkill);
735 err_bluetooth:
736         rfkill_destroy(bluetooth_rfkill);
737         if (wifi_rfkill)
738                 rfkill_unregister(wifi_rfkill);
739 err_wifi:
740         rfkill_destroy(wifi_rfkill);
741 
742         return ret;
743 }
744 
745 static void dell_cleanup_rfkill(void)
746 {
747         if (wifi_rfkill) {
748                 rfkill_unregister(wifi_rfkill);
749                 rfkill_destroy(wifi_rfkill);
750         }
751         if (bluetooth_rfkill) {
752                 rfkill_unregister(bluetooth_rfkill);
753                 rfkill_destroy(bluetooth_rfkill);
754         }
755         if (wwan_rfkill) {
756                 rfkill_unregister(wwan_rfkill);
757                 rfkill_destroy(wwan_rfkill);
758         }
759 }
760 
761 static int dell_send_intensity(struct backlight_device *bd)
762 {
763         int ret = 0;
764 
765         get_buffer();
766         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
767         buffer->input[1] = bd->props.brightness;
768 
769         if (buffer->input[0] == -1) {
770                 ret = -ENODEV;
771                 goto out;
772         }
773 
774         if (power_supply_is_system_supplied() > 0)
775                 dell_send_request(buffer, 1, 2);
776         else
777                 dell_send_request(buffer, 1, 1);
778 
779  out:
780         release_buffer();
781         return ret;
782 }
783 
784 static int dell_get_intensity(struct backlight_device *bd)
785 {
786         int ret = 0;
787 
788         get_buffer();
789         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
790 
791         if (buffer->input[0] == -1) {
792                 ret = -ENODEV;
793                 goto out;
794         }
795 
796         if (power_supply_is_system_supplied() > 0)
797                 dell_send_request(buffer, 0, 2);
798         else
799                 dell_send_request(buffer, 0, 1);
800 
801         ret = buffer->output[1];
802 
803  out:
804         release_buffer();
805         return ret;
806 }
807 
808 static const struct backlight_ops dell_ops = {
809         .get_brightness = dell_get_intensity,
810         .update_status  = dell_send_intensity,
811 };
812 
813 static void touchpad_led_on(void)
814 {
815         int command = 0x97;
816         char data = 1;
817         i8042_command(&data, command | 1 << 12);
818 }
819 
820 static void touchpad_led_off(void)
821 {
822         int command = 0x97;
823         char data = 2;
824         i8042_command(&data, command | 1 << 12);
825 }
826 
827 static void touchpad_led_set(struct led_classdev *led_cdev,
828         enum led_brightness value)
829 {
830         if (value > 0)
831                 touchpad_led_on();
832         else
833                 touchpad_led_off();
834 }
835 
836 static struct led_classdev touchpad_led = {
837         .name = "dell-laptop::touchpad",
838         .brightness_set = touchpad_led_set,
839         .flags = LED_CORE_SUSPENDRESUME,
840 };
841 
842 static int __init touchpad_led_init(struct device *dev)
843 {
844         return led_classdev_register(dev, &touchpad_led);
845 }
846 
847 static void touchpad_led_exit(void)
848 {
849         led_classdev_unregister(&touchpad_led);
850 }
851 
852 /*
853  * Derived from information in smbios-keyboard-ctl:
854  *
855  * cbClass 4
856  * cbSelect 11
857  * Keyboard illumination
858  * cbArg1 determines the function to be performed
859  *
860  * cbArg1 0x0 = Get Feature Information
861  *  cbRES1         Standard return codes (0, -1, -2)
862  *  cbRES2, word0  Bitmap of user-selectable modes
863  *     bit 0     Always off (All systems)
864  *     bit 1     Always on (Travis ATG, Siberia)
865  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
866  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
867  *     bit 4     Auto: Input-activity-based On; input-activity based Off
868  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
869  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
870  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
871  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
872  *     bits 9-15 Reserved for future use
873  *  cbRES2, byte2  Reserved for future use
874  *  cbRES2, byte3  Keyboard illumination type
875  *     0         Reserved
876  *     1         Tasklight
877  *     2         Backlight
878  *     3-255     Reserved for future use
879  *  cbRES3, byte0  Supported auto keyboard illumination trigger bitmap.
880  *     bit 0     Any keystroke
881  *     bit 1     Touchpad activity
882  *     bit 2     Pointing stick
883  *     bit 3     Any mouse
884  *     bits 4-7  Reserved for future use
885  *  cbRES3, byte1  Supported timeout unit bitmap
886  *     bit 0     Seconds
887  *     bit 1     Minutes
888  *     bit 2     Hours
889  *     bit 3     Days
890  *     bits 4-7  Reserved for future use
891  *  cbRES3, byte2  Number of keyboard light brightness levels
892  *  cbRES4, byte0  Maximum acceptable seconds value (0 if seconds not supported).
893  *  cbRES4, byte1  Maximum acceptable minutes value (0 if minutes not supported).
894  *  cbRES4, byte2  Maximum acceptable hours value (0 if hours not supported).
895  *  cbRES4, byte3  Maximum acceptable days value (0 if days not supported)
896  *
897  * cbArg1 0x1 = Get Current State
898  *  cbRES1         Standard return codes (0, -1, -2)
899  *  cbRES2, word0  Bitmap of current mode state
900  *     bit 0     Always off (All systems)
901  *     bit 1     Always on (Travis ATG, Siberia)
902  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
903  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
904  *     bit 4     Auto: Input-activity-based On; input-activity based Off
905  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
906  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
907  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
908  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
909  *     bits 9-15 Reserved for future use
910  *     Note: Only One bit can be set
911  *  cbRES2, byte2  Currently active auto keyboard illumination triggers.
912  *     bit 0     Any keystroke
913  *     bit 1     Touchpad activity
914  *     bit 2     Pointing stick
915  *     bit 3     Any mouse
916  *     bits 4-7  Reserved for future use
917  *  cbRES2, byte3  Current Timeout
918  *     bits 7:6  Timeout units indicator:
919  *     00b       Seconds
920  *     01b       Minutes
921  *     10b       Hours
922  *     11b       Days
923  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
924  *     NOTE: A value of 0 means always on (no timeout) if any bits of RES3 byte
925  *     are set upon return from the [Get feature information] call.
926  *  cbRES3, byte0  Current setting of ALS value that turns the light on or off.
927  *  cbRES3, byte1  Current ALS reading
928  *  cbRES3, byte2  Current keyboard light level.
929  *
930  * cbArg1 0x2 = Set New State
931  *  cbRES1         Standard return codes (0, -1, -2)
932  *  cbArg2, word0  Bitmap of current mode state
933  *     bit 0     Always off (All systems)
934  *     bit 1     Always on (Travis ATG, Siberia)
935  *     bit 2     Auto: ALS-based On; ALS-based Off (Travis ATG)
936  *     bit 3     Auto: ALS- and input-activity-based On; input-activity based Off
937  *     bit 4     Auto: Input-activity-based On; input-activity based Off
938  *     bit 5     Auto: Input-activity-based On (illumination level 25%); input-activity based Off
939  *     bit 6     Auto: Input-activity-based On (illumination level 50%); input-activity based Off
940  *     bit 7     Auto: Input-activity-based On (illumination level 75%); input-activity based Off
941  *     bit 8     Auto: Input-activity-based On (illumination level 100%); input-activity based Off
942  *     bits 9-15 Reserved for future use
943  *     Note: Only One bit can be set
944  *  cbArg2, byte2  Desired auto keyboard illumination triggers. Must remain inactive to allow
945  *                 keyboard to turn off automatically.
946  *     bit 0     Any keystroke
947  *     bit 1     Touchpad activity
948  *     bit 2     Pointing stick
949  *     bit 3     Any mouse
950  *     bits 4-7  Reserved for future use
951  *  cbArg2, byte3  Desired Timeout
952  *     bits 7:6  Timeout units indicator:
953  *     00b       Seconds
954  *     01b       Minutes
955  *     10b       Hours
956  *     11b       Days
957  *     bits 5:0  Timeout value (0-63) in sec/min/hr/day
958  *  cbArg3, byte0  Desired setting of ALS value that turns the light on or off.
959  *  cbArg3, byte2  Desired keyboard light level.
960  */
961 
962 
963 enum kbd_timeout_unit {
964         KBD_TIMEOUT_SECONDS = 0,
965         KBD_TIMEOUT_MINUTES,
966         KBD_TIMEOUT_HOURS,
967         KBD_TIMEOUT_DAYS,
968 };
969 
970 enum kbd_mode_bit {
971         KBD_MODE_BIT_OFF = 0,
972         KBD_MODE_BIT_ON,
973         KBD_MODE_BIT_ALS,
974         KBD_MODE_BIT_TRIGGER_ALS,
975         KBD_MODE_BIT_TRIGGER,
976         KBD_MODE_BIT_TRIGGER_25,
977         KBD_MODE_BIT_TRIGGER_50,
978         KBD_MODE_BIT_TRIGGER_75,
979         KBD_MODE_BIT_TRIGGER_100,
980 };
981 
982 #define kbd_is_als_mode_bit(bit) \
983         ((bit) == KBD_MODE_BIT_ALS || (bit) == KBD_MODE_BIT_TRIGGER_ALS)
984 #define kbd_is_trigger_mode_bit(bit) \
985         ((bit) >= KBD_MODE_BIT_TRIGGER_ALS && (bit) <= KBD_MODE_BIT_TRIGGER_100)
986 #define kbd_is_level_mode_bit(bit) \
987         ((bit) >= KBD_MODE_BIT_TRIGGER_25 && (bit) <= KBD_MODE_BIT_TRIGGER_100)
988 
989 struct kbd_info {
990         u16 modes;
991         u8 type;
992         u8 triggers;
993         u8 levels;
994         u8 seconds;
995         u8 minutes;
996         u8 hours;
997         u8 days;
998 };
999 
1000 struct kbd_state {
1001         u8 mode_bit;
1002         u8 triggers;
1003         u8 timeout_value;
1004         u8 timeout_unit;
1005         u8 als_setting;
1006         u8 als_value;
1007         u8 level;
1008 };
1009 
1010 static const int kbd_tokens[] = {
1011         KBD_LED_OFF_TOKEN,
1012         KBD_LED_AUTO_25_TOKEN,
1013         KBD_LED_AUTO_50_TOKEN,
1014         KBD_LED_AUTO_75_TOKEN,
1015         KBD_LED_AUTO_100_TOKEN,
1016         KBD_LED_ON_TOKEN,
1017 };
1018 
1019 static u16 kbd_token_bits;
1020 
1021 static struct kbd_info kbd_info;
1022 static bool kbd_als_supported;
1023 static bool kbd_triggers_supported;
1024 
1025 static u8 kbd_mode_levels[16];
1026 static int kbd_mode_levels_count;
1027 
1028 static u8 kbd_previous_level;
1029 static u8 kbd_previous_mode_bit;
1030 
1031 static bool kbd_led_present;
1032 
1033 /*
1034  * NOTE: there are three ways to set the keyboard backlight level.
1035  * First, via kbd_state.mode_bit (assigning KBD_MODE_BIT_TRIGGER_* value).
1036  * Second, via kbd_state.level (assigning numerical value <= kbd_info.levels).
1037  * Third, via SMBIOS tokens (KBD_LED_* in kbd_tokens)
1038  *
1039  * There are laptops which support only one of these methods. If we want to
1040  * support as many machines as possible we need to implement all three methods.
1041  * The first two methods use the kbd_state structure. The third uses SMBIOS
1042  * tokens. If kbd_info.levels == 0, the machine does not support setting the
1043  * keyboard backlight level via kbd_state.level.
1044  */
1045 
1046 static int kbd_get_info(struct kbd_info *info)
1047 {
1048         u8 units;
1049         int ret;
1050 
1051         get_buffer();
1052 
1053         buffer->input[0] = 0x0;
1054         dell_send_request(buffer, 4, 11);
1055         ret = buffer->output[0];
1056 
1057         if (ret) {
1058                 ret = dell_smi_error(ret);
1059                 goto out;
1060         }
1061 
1062         info->modes = buffer->output[1] & 0xFFFF;
1063         info->type = (buffer->output[1] >> 24) & 0xFF;
1064         info->triggers = buffer->output[2] & 0xFF;
1065         units = (buffer->output[2] >> 8) & 0xFF;
1066         info->levels = (buffer->output[2] >> 16) & 0xFF;
1067 
1068         if (units & BIT(0))
1069                 info->seconds = (buffer->output[3] >> 0) & 0xFF;
1070         if (units & BIT(1))
1071                 info->minutes = (buffer->output[3] >> 8) & 0xFF;
1072         if (units & BIT(2))
1073                 info->hours = (buffer->output[3] >> 16) & 0xFF;
1074         if (units & BIT(3))
1075                 info->days = (buffer->output[3] >> 24) & 0xFF;
1076 
1077  out:
1078         release_buffer();
1079         return ret;
1080 }
1081 
1082 static unsigned int kbd_get_max_level(void)
1083 {
1084         if (kbd_info.levels != 0)
1085                 return kbd_info.levels;
1086         if (kbd_mode_levels_count > 0)
1087                 return kbd_mode_levels_count - 1;
1088         return 0;
1089 }
1090 
1091 static int kbd_get_level(struct kbd_state *state)
1092 {
1093         int i;
1094 
1095         if (kbd_info.levels != 0)
1096                 return state->level;
1097 
1098         if (kbd_mode_levels_count > 0) {
1099                 for (i = 0; i < kbd_mode_levels_count; ++i)
1100                         if (kbd_mode_levels[i] == state->mode_bit)
1101                                 return i;
1102                 return 0;
1103         }
1104 
1105         return -EINVAL;
1106 }
1107 
1108 static int kbd_set_level(struct kbd_state *state, u8 level)
1109 {
1110         if (kbd_info.levels != 0) {
1111                 if (level != 0)
1112                         kbd_previous_level = level;
1113                 if (state->level == level)
1114                         return 0;
1115                 state->level = level;
1116                 if (level != 0 && state->mode_bit == KBD_MODE_BIT_OFF)
1117                         state->mode_bit = kbd_previous_mode_bit;
1118                 else if (level == 0 && state->mode_bit != KBD_MODE_BIT_OFF) {
1119                         kbd_previous_mode_bit = state->mode_bit;
1120                         state->mode_bit = KBD_MODE_BIT_OFF;
1121                 }
1122                 return 0;
1123         }
1124 
1125         if (kbd_mode_levels_count > 0 && level < kbd_mode_levels_count) {
1126                 if (level != 0)
1127                         kbd_previous_level = level;
1128                 state->mode_bit = kbd_mode_levels[level];
1129                 return 0;
1130         }
1131 
1132         return -EINVAL;
1133 }
1134 
1135 static int kbd_get_state(struct kbd_state *state)
1136 {
1137         int ret;
1138 
1139         get_buffer();
1140 
1141         buffer->input[0] = 0x1;
1142         dell_send_request(buffer, 4, 11);
1143         ret = buffer->output[0];
1144 
1145         if (ret) {
1146                 ret = dell_smi_error(ret);
1147                 goto out;
1148         }
1149 
1150         state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
1151         if (state->mode_bit != 0)
1152                 state->mode_bit--;
1153 
1154         state->triggers = (buffer->output[1] >> 16) & 0xFF;
1155         state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
1156         state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
1157         state->als_setting = buffer->output[2] & 0xFF;
1158         state->als_value = (buffer->output[2] >> 8) & 0xFF;
1159         state->level = (buffer->output[2] >> 16) & 0xFF;
1160 
1161  out:
1162         release_buffer();
1163         return ret;
1164 }
1165 
1166 static int kbd_set_state(struct kbd_state *state)
1167 {
1168         int ret;
1169 
1170         get_buffer();
1171         buffer->input[0] = 0x2;
1172         buffer->input[1] = BIT(state->mode_bit) & 0xFFFF;
1173         buffer->input[1] |= (state->triggers & 0xFF) << 16;
1174         buffer->input[1] |= (state->timeout_value & 0x3F) << 24;
1175         buffer->input[1] |= (state->timeout_unit & 0x3) << 30;
1176         buffer->input[2] = state->als_setting & 0xFF;
1177         buffer->input[2] |= (state->level & 0xFF) << 16;
1178         dell_send_request(buffer, 4, 11);
1179         ret = buffer->output[0];
1180         release_buffer();
1181 
1182         return dell_smi_error(ret);
1183 }
1184 
1185 static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
1186 {
1187         int ret;
1188 
1189         ret = kbd_set_state(state);
1190         if (ret == 0)
1191                 return 0;
1192 
1193         /*
1194          * When setting the new state fails,try to restore the previous one.
1195          * This is needed on some machines where BIOS sets a default state when
1196          * setting a new state fails. This default state could be all off.
1197          */
1198 
1199         if (kbd_set_state(old))
1200                 pr_err("Setting old previous keyboard state failed\n");
1201 
1202         return ret;
1203 }
1204 
1205 static int kbd_set_token_bit(u8 bit)
1206 {
1207         int id;
1208         int ret;
1209 
1210         if (bit >= ARRAY_SIZE(kbd_tokens))
1211                 return -EINVAL;
1212 
1213         id = find_token_id(kbd_tokens[bit]);
1214         if (id == -1)
1215                 return -EINVAL;
1216 
1217         get_buffer();
1218         buffer->input[0] = da_tokens[id].location;
1219         buffer->input[1] = da_tokens[id].value;
1220         dell_send_request(buffer, 1, 0);
1221         ret = buffer->output[0];
1222         release_buffer();
1223 
1224         return dell_smi_error(ret);
1225 }
1226 
1227 static int kbd_get_token_bit(u8 bit)
1228 {
1229         int id;
1230         int ret;
1231         int val;
1232 
1233         if (bit >= ARRAY_SIZE(kbd_tokens))
1234                 return -EINVAL;
1235 
1236         id = find_token_id(kbd_tokens[bit]);
1237         if (id == -1)
1238                 return -EINVAL;
1239 
1240         get_buffer();
1241         buffer->input[0] = da_tokens[id].location;
1242         dell_send_request(buffer, 0, 0);
1243         ret = buffer->output[0];
1244         val = buffer->output[1];
1245         release_buffer();
1246 
1247         if (ret)
1248                 return dell_smi_error(ret);
1249 
1250         return (val == da_tokens[id].value);
1251 }
1252 
1253 static int kbd_get_first_active_token_bit(void)
1254 {
1255         int i;
1256         int ret;
1257 
1258         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i) {
1259                 ret = kbd_get_token_bit(i);
1260                 if (ret == 1)
1261                         return i;
1262         }
1263 
1264         return ret;
1265 }
1266 
1267 static int kbd_get_valid_token_counts(void)
1268 {
1269         return hweight16(kbd_token_bits);
1270 }
1271 
1272 static inline int kbd_init_info(void)
1273 {
1274         struct kbd_state state;
1275         int ret;
1276         int i;
1277 
1278         ret = kbd_get_info(&kbd_info);
1279         if (ret)
1280                 return ret;
1281 
1282         kbd_get_state(&state);
1283 
1284         /* NOTE: timeout value is stored in 6 bits so max value is 63 */
1285         if (kbd_info.seconds > 63)
1286                 kbd_info.seconds = 63;
1287         if (kbd_info.minutes > 63)
1288                 kbd_info.minutes = 63;
1289         if (kbd_info.hours > 63)
1290                 kbd_info.hours = 63;
1291         if (kbd_info.days > 63)
1292                 kbd_info.days = 63;
1293 
1294         /* NOTE: On tested machines ON mode did not work and caused
1295          *       problems (turned backlight off) so do not use it
1296          */
1297         kbd_info.modes &= ~BIT(KBD_MODE_BIT_ON);
1298 
1299         kbd_previous_level = kbd_get_level(&state);
1300         kbd_previous_mode_bit = state.mode_bit;
1301 
1302         if (kbd_previous_level == 0 && kbd_get_max_level() != 0)
1303                 kbd_previous_level = 1;
1304 
1305         if (kbd_previous_mode_bit == KBD_MODE_BIT_OFF) {
1306                 kbd_previous_mode_bit =
1307                         ffs(kbd_info.modes & ~BIT(KBD_MODE_BIT_OFF));
1308                 if (kbd_previous_mode_bit != 0)
1309                         kbd_previous_mode_bit--;
1310         }
1311 
1312         if (kbd_info.modes & (BIT(KBD_MODE_BIT_ALS) |
1313                               BIT(KBD_MODE_BIT_TRIGGER_ALS)))
1314                 kbd_als_supported = true;
1315 
1316         if (kbd_info.modes & (
1317             BIT(KBD_MODE_BIT_TRIGGER_ALS) | BIT(KBD_MODE_BIT_TRIGGER) |
1318             BIT(KBD_MODE_BIT_TRIGGER_25) | BIT(KBD_MODE_BIT_TRIGGER_50) |
1319             BIT(KBD_MODE_BIT_TRIGGER_75) | BIT(KBD_MODE_BIT_TRIGGER_100)
1320            ))
1321                 kbd_triggers_supported = true;
1322 
1323         /* kbd_mode_levels[0] is reserved, see below */
1324         for (i = 0; i < 16; ++i)
1325                 if (kbd_is_level_mode_bit(i) && (BIT(i) & kbd_info.modes))
1326                         kbd_mode_levels[1 + kbd_mode_levels_count++] = i;
1327 
1328         /*
1329          * Find the first supported mode and assign to kbd_mode_levels[0].
1330          * This should be 0 (off), but we cannot depend on the BIOS to
1331          * support 0.
1332          */
1333         if (kbd_mode_levels_count > 0) {
1334                 for (i = 0; i < 16; ++i) {
1335                         if (BIT(i) & kbd_info.modes) {
1336                                 kbd_mode_levels[0] = i;
1337                                 break;
1338                         }
1339                 }
1340                 kbd_mode_levels_count++;
1341         }
1342 
1343         return 0;
1344 
1345 }
1346 
1347 static inline void kbd_init_tokens(void)
1348 {
1349         int i;
1350 
1351         for (i = 0; i < ARRAY_SIZE(kbd_tokens); ++i)
1352                 if (find_token_id(kbd_tokens[i]) != -1)
1353                         kbd_token_bits |= BIT(i);
1354 }
1355 
1356 static void kbd_init(void)
1357 {
1358         int ret;
1359 
1360         ret = kbd_init_info();
1361         kbd_init_tokens();
1362 
1363         if (kbd_token_bits != 0 || ret == 0)
1364                 kbd_led_present = true;
1365 }
1366 
1367 static ssize_t kbd_led_timeout_store(struct device *dev,
1368                                      struct device_attribute *attr,
1369                                      const char *buf, size_t count)
1370 {
1371         struct kbd_state new_state;
1372         struct kbd_state state;
1373         bool convert;
1374         int value;
1375         int ret;
1376         char ch;
1377         u8 unit;
1378         int i;
1379 
1380         ret = sscanf(buf, "%d %c", &value, &ch);
1381         if (ret < 1)
1382                 return -EINVAL;
1383         else if (ret == 1)
1384                 ch = 's';
1385 
1386         if (value < 0)
1387                 return -EINVAL;
1388 
1389         convert = false;
1390 
1391         switch (ch) {
1392         case 's':
1393                 if (value > kbd_info.seconds)
1394                         convert = true;
1395                 unit = KBD_TIMEOUT_SECONDS;
1396                 break;
1397         case 'm':
1398                 if (value > kbd_info.minutes)
1399                         convert = true;
1400                 unit = KBD_TIMEOUT_MINUTES;
1401                 break;
1402         case 'h':
1403                 if (value > kbd_info.hours)
1404                         convert = true;
1405                 unit = KBD_TIMEOUT_HOURS;
1406                 break;
1407         case 'd':
1408                 if (value > kbd_info.days)
1409                         convert = true;
1410                 unit = KBD_TIMEOUT_DAYS;
1411                 break;
1412         default:
1413                 return -EINVAL;
1414         }
1415 
1416         if (quirks && quirks->needs_kbd_timeouts)
1417                 convert = true;
1418 
1419         if (convert) {
1420                 /* Convert value from current units to seconds */
1421                 switch (unit) {
1422                 case KBD_TIMEOUT_DAYS:
1423                         value *= 24;
1424                 case KBD_TIMEOUT_HOURS:
1425                         value *= 60;
1426                 case KBD_TIMEOUT_MINUTES:
1427                         value *= 60;
1428                         unit = KBD_TIMEOUT_SECONDS;
1429                 }
1430 
1431                 if (quirks && quirks->needs_kbd_timeouts) {
1432                         for (i = 0; quirks->kbd_timeouts[i] != -1; i++) {
1433                                 if (value <= quirks->kbd_timeouts[i]) {
1434                                         value = quirks->kbd_timeouts[i];
1435                                         break;
1436                                 }
1437                         }
1438                 }
1439 
1440                 if (value <= kbd_info.seconds && kbd_info.seconds) {
1441                         unit = KBD_TIMEOUT_SECONDS;
1442                 } else if (value / 60 <= kbd_info.minutes && kbd_info.minutes) {
1443                         value /= 60;
1444                         unit = KBD_TIMEOUT_MINUTES;
1445                 } else if (value / (60 * 60) <= kbd_info.hours && kbd_info.hours) {
1446                         value /= (60 * 60);
1447                         unit = KBD_TIMEOUT_HOURS;
1448                 } else if (value / (60 * 60 * 24) <= kbd_info.days && kbd_info.days) {
1449                         value /= (60 * 60 * 24);
1450                         unit = KBD_TIMEOUT_DAYS;
1451                 } else {
1452                         return -EINVAL;
1453                 }
1454         }
1455 
1456         ret = kbd_get_state(&state);
1457         if (ret)
1458                 return ret;
1459 
1460         new_state = state;
1461         new_state.timeout_value = value;
1462         new_state.timeout_unit = unit;
1463 
1464         ret = kbd_set_state_safe(&new_state, &state);
1465         if (ret)
1466                 return ret;
1467 
1468         return count;
1469 }
1470 
1471 static ssize_t kbd_led_timeout_show(struct device *dev,
1472                                     struct device_attribute *attr, char *buf)
1473 {
1474         struct kbd_state state;
1475         int ret;
1476         int len;
1477 
1478         ret = kbd_get_state(&state);
1479         if (ret)
1480                 return ret;
1481 
1482         len = sprintf(buf, "%d", state.timeout_value);
1483 
1484         switch (state.timeout_unit) {
1485         case KBD_TIMEOUT_SECONDS:
1486                 return len + sprintf(buf+len, "s\n");
1487         case KBD_TIMEOUT_MINUTES:
1488                 return len + sprintf(buf+len, "m\n");
1489         case KBD_TIMEOUT_HOURS:
1490                 return len + sprintf(buf+len, "h\n");
1491         case KBD_TIMEOUT_DAYS:
1492                 return len + sprintf(buf+len, "d\n");
1493         default:
1494                 return -EINVAL;
1495         }
1496 
1497         return len;
1498 }
1499 
1500 static DEVICE_ATTR(stop_timeout, S_IRUGO | S_IWUSR,
1501                    kbd_led_timeout_show, kbd_led_timeout_store);
1502 
1503 static const char * const kbd_led_triggers[] = {
1504         "keyboard",
1505         "touchpad",
1506         /*"trackstick"*/ NULL, /* NOTE: trackstick is just alias for touchpad */
1507         "mouse",
1508 };
1509 
1510 static ssize_t kbd_led_triggers_store(struct device *dev,
1511                                       struct device_attribute *attr,
1512                                       const char *buf, size_t count)
1513 {
1514         struct kbd_state new_state;
1515         struct kbd_state state;
1516         bool triggers_enabled = false;
1517         int trigger_bit = -1;
1518         char trigger[21];
1519         int i, ret;
1520 
1521         ret = sscanf(buf, "%20s", trigger);
1522         if (ret != 1)
1523                 return -EINVAL;
1524 
1525         if (trigger[0] != '+' && trigger[0] != '-')
1526                 return -EINVAL;
1527 
1528         ret = kbd_get_state(&state);
1529         if (ret)
1530                 return ret;
1531 
1532         if (kbd_triggers_supported)
1533                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1534 
1535         if (kbd_triggers_supported) {
1536                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1537                         if (!(kbd_info.triggers & BIT(i)))
1538                                 continue;
1539                         if (!kbd_led_triggers[i])
1540                                 continue;
1541                         if (strcmp(trigger+1, kbd_led_triggers[i]) != 0)
1542                                 continue;
1543                         if (trigger[0] == '+' &&
1544                             triggers_enabled && (state.triggers & BIT(i)))
1545                                 return count;
1546                         if (trigger[0] == '-' &&
1547                             (!triggers_enabled || !(state.triggers & BIT(i))))
1548                                 return count;
1549                         trigger_bit = i;
1550                         break;
1551                 }
1552         }
1553 
1554         if (trigger_bit != -1) {
1555                 new_state = state;
1556                 if (trigger[0] == '+')
1557                         new_state.triggers |= BIT(trigger_bit);
1558                 else {
1559                         new_state.triggers &= ~BIT(trigger_bit);
1560                         /* NOTE: trackstick bit (2) must be disabled when
1561                          *       disabling touchpad bit (1), otherwise touchpad
1562                          *       bit (1) will not be disabled */
1563                         if (trigger_bit == 1)
1564                                 new_state.triggers &= ~BIT(2);
1565                 }
1566                 if ((kbd_info.triggers & new_state.triggers) !=
1567                     new_state.triggers)
1568                         return -EINVAL;
1569                 if (new_state.triggers && !triggers_enabled) {
1570                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1571                         kbd_set_level(&new_state, kbd_previous_level);
1572                 } else if (new_state.triggers == 0) {
1573                         kbd_set_level(&new_state, 0);
1574                 }
1575                 if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1576                         return -EINVAL;
1577                 ret = kbd_set_state_safe(&new_state, &state);
1578                 if (ret)
1579                         return ret;
1580                 if (new_state.mode_bit != KBD_MODE_BIT_OFF)
1581                         kbd_previous_mode_bit = new_state.mode_bit;
1582                 return count;
1583         }
1584 
1585         return -EINVAL;
1586 }
1587 
1588 static ssize_t kbd_led_triggers_show(struct device *dev,
1589                                      struct device_attribute *attr, char *buf)
1590 {
1591         struct kbd_state state;
1592         bool triggers_enabled;
1593         int level, i, ret;
1594         int len = 0;
1595 
1596         ret = kbd_get_state(&state);
1597         if (ret)
1598                 return ret;
1599 
1600         len = 0;
1601 
1602         if (kbd_triggers_supported) {
1603                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1604                 level = kbd_get_level(&state);
1605                 for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); ++i) {
1606                         if (!(kbd_info.triggers & BIT(i)))
1607                                 continue;
1608                         if (!kbd_led_triggers[i])
1609                                 continue;
1610                         if ((triggers_enabled || level <= 0) &&
1611                             (state.triggers & BIT(i)))
1612                                 buf[len++] = '+';
1613                         else
1614                                 buf[len++] = '-';
1615                         len += sprintf(buf+len, "%s ", kbd_led_triggers[i]);
1616                 }
1617         }
1618 
1619         if (len)
1620                 buf[len - 1] = '\n';
1621 
1622         return len;
1623 }
1624 
1625 static DEVICE_ATTR(start_triggers, S_IRUGO | S_IWUSR,
1626                    kbd_led_triggers_show, kbd_led_triggers_store);
1627 
1628 static ssize_t kbd_led_als_enabled_store(struct device *dev,
1629                                          struct device_attribute *attr,
1630                                          const char *buf, size_t count)
1631 {
1632         struct kbd_state new_state;
1633         struct kbd_state state;
1634         bool triggers_enabled = false;
1635         int enable;
1636         int ret;
1637 
1638         ret = kstrtoint(buf, 0, &enable);
1639         if (ret)
1640                 return ret;
1641 
1642         ret = kbd_get_state(&state);
1643         if (ret)
1644                 return ret;
1645 
1646         if (enable == kbd_is_als_mode_bit(state.mode_bit))
1647                 return count;
1648 
1649         new_state = state;
1650 
1651         if (kbd_triggers_supported)
1652                 triggers_enabled = kbd_is_trigger_mode_bit(state.mode_bit);
1653 
1654         if (enable) {
1655                 if (triggers_enabled)
1656                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER_ALS;
1657                 else
1658                         new_state.mode_bit = KBD_MODE_BIT_ALS;
1659         } else {
1660                 if (triggers_enabled) {
1661                         new_state.mode_bit = KBD_MODE_BIT_TRIGGER;
1662                         kbd_set_level(&new_state, kbd_previous_level);
1663                 } else {
1664                         new_state.mode_bit = KBD_MODE_BIT_ON;
1665                 }
1666         }
1667         if (!(kbd_info.modes & BIT(new_state.mode_bit)))
1668                 return -EINVAL;
1669 
1670         ret = kbd_set_state_safe(&new_state, &state);
1671         if (ret)
1672                 return ret;
1673         kbd_previous_mode_bit = new_state.mode_bit;
1674 
1675         return count;
1676 }
1677 
1678 static ssize_t kbd_led_als_enabled_show(struct device *dev,
1679                                         struct device_attribute *attr,
1680                                         char *buf)
1681 {
1682         struct kbd_state state;
1683         bool enabled = false;
1684         int ret;
1685 
1686         ret = kbd_get_state(&state);
1687         if (ret)
1688                 return ret;
1689         enabled = kbd_is_als_mode_bit(state.mode_bit);
1690 
1691         return sprintf(buf, "%d\n", enabled ? 1 : 0);
1692 }
1693 
1694 static DEVICE_ATTR(als_enabled, S_IRUGO | S_IWUSR,
1695                    kbd_led_als_enabled_show, kbd_led_als_enabled_store);
1696 
1697 static ssize_t kbd_led_als_setting_store(struct device *dev,
1698                                          struct device_attribute *attr,
1699                                          const char *buf, size_t count)
1700 {
1701         struct kbd_state state;
1702         struct kbd_state new_state;
1703         u8 setting;
1704         int ret;
1705 
1706         ret = kstrtou8(buf, 10, &setting);
1707         if (ret)
1708                 return ret;
1709 
1710         ret = kbd_get_state(&state);
1711         if (ret)
1712                 return ret;
1713 
1714         new_state = state;
1715         new_state.als_setting = setting;
1716 
1717         ret = kbd_set_state_safe(&new_state, &state);
1718         if (ret)
1719                 return ret;
1720 
1721         return count;
1722 }
1723 
1724 static ssize_t kbd_led_als_setting_show(struct device *dev,
1725                                         struct device_attribute *attr,
1726                                         char *buf)
1727 {
1728         struct kbd_state state;
1729         int ret;
1730 
1731         ret = kbd_get_state(&state);
1732         if (ret)
1733                 return ret;
1734 
1735         return sprintf(buf, "%d\n", state.als_setting);
1736 }
1737 
1738 static DEVICE_ATTR(als_setting, S_IRUGO | S_IWUSR,
1739                    kbd_led_als_setting_show, kbd_led_als_setting_store);
1740 
1741 static struct attribute *kbd_led_attrs[] = {
1742         &dev_attr_stop_timeout.attr,
1743         &dev_attr_start_triggers.attr,
1744         NULL,
1745 };
1746 
1747 static const struct attribute_group kbd_led_group = {
1748         .attrs = kbd_led_attrs,
1749 };
1750 
1751 static struct attribute *kbd_led_als_attrs[] = {
1752         &dev_attr_als_enabled.attr,
1753         &dev_attr_als_setting.attr,
1754         NULL,
1755 };
1756 
1757 static const struct attribute_group kbd_led_als_group = {
1758         .attrs = kbd_led_als_attrs,
1759 };
1760 
1761 static const struct attribute_group *kbd_led_groups[] = {
1762         &kbd_led_group,
1763         &kbd_led_als_group,
1764         NULL,
1765 };
1766 
1767 static enum led_brightness kbd_led_level_get(struct led_classdev *led_cdev)
1768 {
1769         int ret;
1770         u16 num;
1771         struct kbd_state state;
1772 
1773         if (kbd_get_max_level()) {
1774                 ret = kbd_get_state(&state);
1775                 if (ret)
1776                         return 0;
1777                 ret = kbd_get_level(&state);
1778                 if (ret < 0)
1779                         return 0;
1780                 return ret;
1781         }
1782 
1783         if (kbd_get_valid_token_counts()) {
1784                 ret = kbd_get_first_active_token_bit();
1785                 if (ret < 0)
1786                         return 0;
1787                 for (num = kbd_token_bits; num != 0 && ret > 0; --ret)
1788                         num &= num - 1; /* clear the first bit set */
1789                 if (num == 0)
1790                         return 0;
1791                 return ffs(num) - 1;
1792         }
1793 
1794         pr_warn("Keyboard brightness level control not supported\n");
1795         return 0;
1796 }
1797 
1798 static void kbd_led_level_set(struct led_classdev *led_cdev,
1799                               enum led_brightness value)
1800 {
1801         struct kbd_state state;
1802         struct kbd_state new_state;
1803         u16 num;
1804 
1805         if (kbd_get_max_level()) {
1806                 if (kbd_get_state(&state))
1807                         return;
1808                 new_state = state;
1809                 if (kbd_set_level(&new_state, value))
1810                         return;
1811                 kbd_set_state_safe(&new_state, &state);
1812                 return;
1813         }
1814 
1815         if (kbd_get_valid_token_counts()) {
1816                 for (num = kbd_token_bits; num != 0 && value > 0; --value)
1817                         num &= num - 1; /* clear the first bit set */
1818                 if (num == 0)
1819                         return;
1820                 kbd_set_token_bit(ffs(num) - 1);
1821                 return;
1822         }
1823 
1824         pr_warn("Keyboard brightness level control not supported\n");
1825 }
1826 
1827 static struct led_classdev kbd_led = {
1828         .name           = "dell::kbd_backlight",
1829         .brightness_set = kbd_led_level_set,
1830         .brightness_get = kbd_led_level_get,
1831         .groups         = kbd_led_groups,
1832 };
1833 
1834 static int __init kbd_led_init(struct device *dev)
1835 {
1836         kbd_init();
1837         if (!kbd_led_present)
1838                 return -ENODEV;
1839         if (!kbd_als_supported)
1840                 kbd_led_groups[1] = NULL;
1841         kbd_led.max_brightness = kbd_get_max_level();
1842         if (!kbd_led.max_brightness) {
1843                 kbd_led.max_brightness = kbd_get_valid_token_counts();
1844                 if (kbd_led.max_brightness)
1845                         kbd_led.max_brightness--;
1846         }
1847         return led_classdev_register(dev, &kbd_led);
1848 }
1849 
1850 static void brightness_set_exit(struct led_classdev *led_cdev,
1851                                 enum led_brightness value)
1852 {
1853         /* Don't change backlight level on exit */
1854 };
1855 
1856 static void kbd_led_exit(void)
1857 {
1858         if (!kbd_led_present)
1859                 return;
1860         kbd_led.brightness_set = brightness_set_exit;
1861         led_classdev_unregister(&kbd_led);
1862 }
1863 
1864 static int __init dell_init(void)
1865 {
1866         int max_intensity = 0;
1867         int ret;
1868 
1869         if (!dmi_check_system(dell_device_table))
1870                 return -ENODEV;
1871 
1872         quirks = NULL;
1873         /* find if this machine support other functions */
1874         dmi_check_system(dell_quirks);
1875 
1876         dmi_walk(find_tokens, NULL);
1877 
1878         if (!da_tokens)  {
1879                 pr_info("Unable to find dmi tokens\n");
1880                 return -ENODEV;
1881         }
1882 
1883         ret = platform_driver_register(&platform_driver);
1884         if (ret)
1885                 goto fail_platform_driver;
1886         platform_device = platform_device_alloc("dell-laptop", -1);
1887         if (!platform_device) {
1888                 ret = -ENOMEM;
1889                 goto fail_platform_device1;
1890         }
1891         ret = platform_device_add(platform_device);
1892         if (ret)
1893                 goto fail_platform_device2;
1894 
1895         /*
1896          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
1897          * is passed to SMI handler.
1898          */
1899         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
1900         if (!bufferpage) {
1901                 ret = -ENOMEM;
1902                 goto fail_buffer;
1903         }
1904         buffer = page_address(bufferpage);
1905 
1906         ret = dell_setup_rfkill();
1907 
1908         if (ret) {
1909                 pr_warn("Unable to setup rfkill\n");
1910                 goto fail_rfkill;
1911         }
1912 
1913         if (quirks && quirks->touchpad_led)
1914                 touchpad_led_init(&platform_device->dev);
1915 
1916         kbd_led_init(&platform_device->dev);
1917 
1918         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
1919         if (dell_laptop_dir != NULL)
1920                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
1921                                     &dell_debugfs_fops);
1922 
1923 #ifdef CONFIG_ACPI
1924         /* In the event of an ACPI backlight being available, don't
1925          * register the platform controller.
1926          */
1927         if (acpi_video_backlight_support())
1928                 return 0;
1929 #endif
1930 
1931         get_buffer();
1932         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
1933         if (buffer->input[0] != -1) {
1934                 dell_send_request(buffer, 0, 2);
1935                 max_intensity = buffer->output[3];
1936         }
1937         release_buffer();
1938 
1939         if (max_intensity) {
1940                 struct backlight_properties props;
1941                 memset(&props, 0, sizeof(struct backlight_properties));
1942                 props.type = BACKLIGHT_PLATFORM;
1943                 props.max_brightness = max_intensity;
1944                 dell_backlight_device = backlight_device_register("dell_backlight",
1945                                                                   &platform_device->dev,
1946                                                                   NULL,
1947                                                                   &dell_ops,
1948                                                                   &props);
1949 
1950                 if (IS_ERR(dell_backlight_device)) {
1951                         ret = PTR_ERR(dell_backlight_device);
1952                         dell_backlight_device = NULL;
1953                         goto fail_backlight;
1954                 }
1955 
1956                 dell_backlight_device->props.brightness =
1957                         dell_get_intensity(dell_backlight_device);
1958                 backlight_update_status(dell_backlight_device);
1959         }
1960 
1961         return 0;
1962 
1963 fail_backlight:
1964         i8042_remove_filter(dell_laptop_i8042_filter);
1965         cancel_delayed_work_sync(&dell_rfkill_work);
1966         dell_cleanup_rfkill();
1967 fail_rfkill:
1968         free_page((unsigned long)bufferpage);
1969 fail_buffer:
1970         platform_device_del(platform_device);
1971 fail_platform_device2:
1972         platform_device_put(platform_device);
1973 fail_platform_device1:
1974         platform_driver_unregister(&platform_driver);
1975 fail_platform_driver:
1976         kfree(da_tokens);
1977         return ret;
1978 }
1979 
1980 static void __exit dell_exit(void)
1981 {
1982         debugfs_remove_recursive(dell_laptop_dir);
1983         if (quirks && quirks->touchpad_led)
1984                 touchpad_led_exit();
1985         kbd_led_exit();
1986         i8042_remove_filter(dell_laptop_i8042_filter);
1987         cancel_delayed_work_sync(&dell_rfkill_work);
1988         backlight_device_unregister(dell_backlight_device);
1989         dell_cleanup_rfkill();
1990         if (platform_device) {
1991                 platform_device_unregister(platform_device);
1992                 platform_driver_unregister(&platform_driver);
1993         }
1994         kfree(da_tokens);
1995         free_page((unsigned long)buffer);
1996 }
1997 
1998 module_init(dell_init);
1999 module_exit(dell_exit);
2000 
2001 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
2002 MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
2003 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
2004 MODULE_DESCRIPTION("Dell laptop driver");
2005 MODULE_LICENSE("GPL");
2006 

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