Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 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

Linux/drivers/platform/x86/dell-laptop.c

  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 
 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         }
 88 };
 89 
 90 static struct platform_device *platform_device;
 91 static struct backlight_device *dell_backlight_device;
 92 static struct rfkill *wifi_rfkill;
 93 static struct rfkill *bluetooth_rfkill;
 94 static struct rfkill *wwan_rfkill;
 95 static bool force_rfkill;
 96 
 97 module_param(force_rfkill, bool, 0444);
 98 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 99 
100 static const struct dmi_system_id dell_device_table[] __initconst = {
101         {
102                 .ident = "Dell laptop",
103                 .matches = {
104                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
105                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
106                 },
107         },
108         {
109                 .matches = {
110                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
111                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
112                 },
113         },
114         {
115                 .ident = "Dell Computer Corporation",
116                 .matches = {
117                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
118                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
119                 },
120         },
121         { }
122 };
123 MODULE_DEVICE_TABLE(dmi, dell_device_table);
124 
125 static const struct dmi_system_id dell_quirks[] __initconst = {
126         {
127                 .callback = dmi_matched,
128                 .ident = "Dell Vostro V130",
129                 .matches = {
130                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
131                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
132                 },
133                 .driver_data = &quirk_dell_vostro_v130,
134         },
135         {
136                 .callback = dmi_matched,
137                 .ident = "Dell Vostro V131",
138                 .matches = {
139                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
140                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
141                 },
142                 .driver_data = &quirk_dell_vostro_v130,
143         },
144         {
145                 .callback = dmi_matched,
146                 .ident = "Dell Vostro 3350",
147                 .matches = {
148                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
149                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
150                 },
151                 .driver_data = &quirk_dell_vostro_v130,
152         },
153         {
154                 .callback = dmi_matched,
155                 .ident = "Dell Vostro 3555",
156                 .matches = {
157                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
158                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
159                 },
160                 .driver_data = &quirk_dell_vostro_v130,
161         },
162         {
163                 .callback = dmi_matched,
164                 .ident = "Dell Inspiron N311z",
165                 .matches = {
166                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
167                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
168                 },
169                 .driver_data = &quirk_dell_vostro_v130,
170         },
171         {
172                 .callback = dmi_matched,
173                 .ident = "Dell Inspiron M5110",
174                 .matches = {
175                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
176                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
177                 },
178                 .driver_data = &quirk_dell_vostro_v130,
179         },
180         {
181                 .callback = dmi_matched,
182                 .ident = "Dell Vostro 3360",
183                 .matches = {
184                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
185                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
186                 },
187                 .driver_data = &quirk_dell_vostro_v130,
188         },
189         {
190                 .callback = dmi_matched,
191                 .ident = "Dell Vostro 3460",
192                 .matches = {
193                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
194                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
195                 },
196                 .driver_data = &quirk_dell_vostro_v130,
197         },
198         {
199                 .callback = dmi_matched,
200                 .ident = "Dell Vostro 3560",
201                 .matches = {
202                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
203                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
204                 },
205                 .driver_data = &quirk_dell_vostro_v130,
206         },
207         {
208                 .callback = dmi_matched,
209                 .ident = "Dell Vostro 3450",
210                 .matches = {
211                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
212                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
213                 },
214                 .driver_data = &quirk_dell_vostro_v130,
215         },
216         {
217                 .callback = dmi_matched,
218                 .ident = "Dell Inspiron 5420",
219                 .matches = {
220                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
221                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
222                 },
223                 .driver_data = &quirk_dell_vostro_v130,
224         },
225         {
226                 .callback = dmi_matched,
227                 .ident = "Dell Inspiron 5520",
228                 .matches = {
229                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
230                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
231                 },
232                 .driver_data = &quirk_dell_vostro_v130,
233         },
234         {
235                 .callback = dmi_matched,
236                 .ident = "Dell Inspiron 5720",
237                 .matches = {
238                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
239                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
240                 },
241                 .driver_data = &quirk_dell_vostro_v130,
242         },
243         {
244                 .callback = dmi_matched,
245                 .ident = "Dell Inspiron 7420",
246                 .matches = {
247                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
248                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
249                 },
250                 .driver_data = &quirk_dell_vostro_v130,
251         },
252         {
253                 .callback = dmi_matched,
254                 .ident = "Dell Inspiron 7520",
255                 .matches = {
256                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
257                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
258                 },
259                 .driver_data = &quirk_dell_vostro_v130,
260         },
261         {
262                 .callback = dmi_matched,
263                 .ident = "Dell Inspiron 7720",
264                 .matches = {
265                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
266                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
267                 },
268                 .driver_data = &quirk_dell_vostro_v130,
269         },
270         { }
271 };
272 
273 static struct calling_interface_buffer *buffer;
274 static struct page *bufferpage;
275 static DEFINE_MUTEX(buffer_mutex);
276 
277 static int hwswitch_state;
278 
279 static void get_buffer(void)
280 {
281         mutex_lock(&buffer_mutex);
282         memset(buffer, 0, sizeof(struct calling_interface_buffer));
283 }
284 
285 static void release_buffer(void)
286 {
287         mutex_unlock(&buffer_mutex);
288 }
289 
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 
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 
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 *
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 
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 */
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 
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 
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 
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 
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 
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 
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 & I8042_STR_AUXDATA)
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 
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 
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 
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 
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 
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 
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 
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 
782 static int __init touchpad_led_init(struct device *dev)
783 {
784         return led_classdev_register(dev, &touchpad_led);
785 }
786 
787 static void touchpad_led_exit(void)
788 {
789         led_classdev_unregister(&touchpad_led);
790 }
791 
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         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
828         if (!bufferpage) {
829                 ret = -ENOMEM;
830                 goto fail_buffer;
831         }
832         buffer = page_address(bufferpage);
833 
834         ret = dell_setup_rfkill();
835 
836         if (ret) {
837                 pr_warn("Unable to setup rfkill\n");
838                 goto fail_rfkill;
839         }
840 
841         if (quirks && quirks->touchpad_led)
842                 touchpad_led_init(&platform_device->dev);
843 
844         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
845         if (dell_laptop_dir != NULL)
846                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
847                                     &dell_debugfs_fops);
848 
849 #ifdef CONFIG_ACPI
850         /* In the event of an ACPI backlight being available, don't
851          * register the platform controller.
852          */
853         if (acpi_video_backlight_support())
854                 return 0;
855 #endif
856 
857         get_buffer();
858         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
859         if (buffer->input[0] != -1) {
860                 dell_send_request(buffer, 0, 2);
861                 max_intensity = buffer->output[3];
862         }
863         release_buffer();
864 
865         if (max_intensity) {
866                 struct backlight_properties props;
867                 memset(&props, 0, sizeof(struct backlight_properties));
868                 props.type = BACKLIGHT_PLATFORM;
869                 props.max_brightness = max_intensity;
870                 dell_backlight_device = backlight_device_register("dell_backlight",
871                                                                   &platform_device->dev,
872                                                                   NULL,
873                                                                   &dell_ops,
874                                                                   &props);
875 
876                 if (IS_ERR(dell_backlight_device)) {
877                         ret = PTR_ERR(dell_backlight_device);
878                         dell_backlight_device = NULL;
879                         goto fail_backlight;
880                 }
881 
882                 dell_backlight_device->props.brightness =
883                         dell_get_intensity(dell_backlight_device);
884                 backlight_update_status(dell_backlight_device);
885         }
886 
887         return 0;
888 
889 fail_backlight:
890         i8042_remove_filter(dell_laptop_i8042_filter);
891         cancel_delayed_work_sync(&dell_rfkill_work);
892         dell_cleanup_rfkill();
893 fail_rfkill:
894         free_page((unsigned long)bufferpage);
895 fail_buffer:
896         platform_device_del(platform_device);
897 fail_platform_device2:
898         platform_device_put(platform_device);
899 fail_platform_device1:
900         platform_driver_unregister(&platform_driver);
901 fail_platform_driver:
902         kfree(da_tokens);
903         return ret;
904 }
905 
906 static void __exit dell_exit(void)
907 {
908         debugfs_remove_recursive(dell_laptop_dir);
909         if (quirks && quirks->touchpad_led)
910                 touchpad_led_exit();
911         i8042_remove_filter(dell_laptop_i8042_filter);
912         cancel_delayed_work_sync(&dell_rfkill_work);
913         backlight_device_unregister(dell_backlight_device);
914         dell_cleanup_rfkill();
915         if (platform_device) {
916                 platform_device_unregister(platform_device);
917                 platform_driver_unregister(&platform_driver);
918         }
919         kfree(da_tokens);
920         free_page((unsigned long)buffer);
921 }
922 
923 module_init(dell_init);
924 module_exit(dell_exit);
925 
926 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
927 MODULE_DESCRIPTION("Dell laptop driver");
928 MODULE_LICENSE("GPL");
929 

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